JP6220134B2 - Wet coating wall material composition, wet coating wall material composition slurry, and production method thereof - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a wet coating wall material composition and a wet coating wall material composition slurry used for applications such as wall coating materials, and methods for producing them.

  A wet method is known as a method of forming a coating layer (painted wall / coated floor) on the wall or floor of a building. The wet method is a slurry obtained by adding water to an inorganic powder base material such as mortar, plaster, diatomaceous earth, etc., and applying the slurry to the surface of a wall or the like by troweling the slurry. Is a method of forming The wet coating layer has many advantages such as excellent texture, humidity control function, and ease of recycling.

  On the other hand, the wet coating layer has a problem in that moisture evaporates with time, so that the wet coating layer is dried and contracted to cause cracks. For this reason, conventionally, for the purpose of preventing the cracks, a fibrous reinforcing material such as soot has been added to the inorganic powder main material. For example, a wall material composition in which soot is added to an inorganic powder main material such as slaked lime or cinnabar is disclosed (see Patent Document 1).

JP 2001-192255 A

  However, the coating wall material to which a fibrous reinforcing material such as soot is added has a problem that the color of the wet coating layer to be formed becomes dark and glossiness cannot be obtained. Therefore, in order to finish a glossy coating layer, it was necessary to separately perform polishing by hand, trowel, and velvet after the coating operation.

  The present invention has been made to solve the above-described problems of the prior art. That is, the present invention provides a wet coating wall composition capable of forming a glossy coating layer only by a coating operation without performing a polishing operation, in addition to preventing cracking due to drying / shrinking. And a wet coating wall material composition slurry, and a method for producing them.

  As a result of intensive studies on the above problems, the present inventors are able to solve the problems of the prior art by using fibrillated cellulose fibers as the fibrous reinforcing material and adding titanium compound powder. As a result, the present invention has been completed.

[1] Wet coating wall material composition, wet coating wall material composition slurry:
According to the present invention, titanium comprising at least one compound selected from the group consisting of inorganic powder main material (A), fibrous reinforcing material (B) comprising fibrillated cellulose fibers, and titanium oxide and titanate. A wet coating material composition comprising a compound powder (C) as a constituent component, wherein the fibrous reinforcing material (B) is 0.1 to 100 parts by mass of the inorganic powder main material (A). 5 parts by mass and the titanium compound powder (C) are blended at a ratio of 0.5 to 10 parts by mass, and a wet coating material composition is provided.

  In the composition of the present invention, the titanium compound powder (C) is a powder of at least one titanium compound selected from the group consisting of titanium oxide, zinc oxide-dizinc titanate, dizinc titanate and zinc titanate. Preferably there is. In the composition of the present invention, all or a part of the inorganic powder main material (A) is at least one compound selected from the group consisting of dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum and calcium carbonate. A powder is preferred. Furthermore, in the composition of the present invention, all or part of the inorganic powder main material (A) is a powder of at least one compound selected from the group of slaked lime, magnesium oxide, quicklime and dolomite. preferable.

  In the composition of the present invention, it is preferable that all or part of the fibrillated cellulose fiber is a fibrillated cellulose fiber derived from waste gypsum board. In the composition of the present invention, the inorganic powder main material (A) is a powder of at least one compound selected from the group of dihydrate gypsum, hemihydrate gypsum and anhydrous gypsum derived only from waste gypsum board. It is preferable that the fibrous reinforcing material (B) is a fibrillated cellulose fiber derived only from waste gypsum board. Furthermore, it is preferable that the composition of this invention contains a pigment (D) further.

  According to the present invention, there is provided a wet coating wall material composition slurry obtained by kneading the wet coating wall material composition and water.

[2] Method for producing wet coating wall material composition or wet coating wall material composition slurry:
According to the present invention, titanium comprising at least one compound selected from the group consisting of inorganic powder main material (A), fibrous reinforcing material (B) comprising fibrillated cellulose fibers, and titanium oxide and titanate. It is a manufacturing method of the wet coating wall material composition which uses a compound powder (C) as a structural component, Comprising: At least 0.1-5 mass parts of cellulose fibers with respect to 100 mass parts of inorganic type powder main materials (A). Water is added to the blended raw material powder to prepare a slurry, which is heated in a state where the liquidity of the slurry is adjusted to acidic or basic, and the cellulose fibers are fibrillated as a fibrous reinforcing material (B). There is provided a method for producing a wet coating material composition or a wet coating material composition slurry, comprising a fibrillation step (1) of making cellulose fibers.

  In the production method of the present invention, as the titanium compound powder (C), at least one titanium compound powder selected from the group consisting of titanium oxide, zinc oxide-dizinc titanate, dizinc titanate and zinc titanate is used. It is preferable to use it. In the production method of the present invention, as the whole or part of the inorganic powder main material (A), at least one compound selected from the group of dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum and calcium carbonate is used. It is preferable to use a powder. Furthermore, it is preferable to use a powder of at least one compound selected from the group of slaked lime, magnesium oxide, quicklime and dolomite as all or part of the inorganic powder main material (A).

  In the production method of the present invention, it is preferable to use cellulose fibers derived from waste gypsum board as all or part of the cellulose fibers. Further, as the inorganic powder main material (A), only the powder of at least one compound selected from the group of dihydrate gypsum, hemihydrate gypsum and anhydrous gypsum derived from waste gypsum board is used as the cellulose fiber. It is preferable to use only cellulose fibers derived from waste gypsum board.

  In the production method of the present invention, after the fibrillation step (1), the solid content obtained from the slurry is pulverized and / or classified so that the maximum particle size is 1 mm or less, and the wet coating material composition It is preferable to further include a pulverization / classification step (2) for obtaining a powder of the above.

  The wet coating wall material composition according to the present invention can form a dense and smooth coating layer having a surface roughness of 5 μm or less. Therefore, a glossy wet coating layer can be formed only by the coating operation without performing the polishing operation. Moreover, in the formed coating layer, the crack accompanying drying and shrinkage | contraction can be prevented. Furthermore, the method for producing a wet coating wall material composition according to the present invention comprises a very simple process of heating a slurry containing an inorganic powder main material, cellulose fiber and titanium compound powder under acidic or basic conditions. The wet coating wall material composition or wet coating wall material composition slurry according to the invention can be produced.

  Hereinafter, the present invention will be described in detail. However, the present invention is not limited to the following embodiment, and includes all objects having the invention-specific matters.

[1] Wet coating wall material composition:
The wet coating wall material composition according to the present invention comprises an inorganic powder main material (A), a fibrous reinforcing material (B), and a titanium compound powder (C) as constituent components.

[1-1] Inorganic powder main material (A):
The inorganic powder main material (A) is a main material of the wet coated wall material composition, and is a powdery material for forming a wet coated layer (painted wall, painted floor, etc.). Usually, it is mixed with water to form a slurry, which is applied to the object to be coated (such as a wall).

  The kind of inorganic powder main material (A) is not specifically limited, What is necessary is just to use a conventionally well-known material. Usually, a powdery inorganic material is used. Among these, it is preferable to use a hydraulic material or a pneumatic material that can cure the coating layer after coating.

  The hydraulic property is a property that cures by absorption (hydration) of moisture. Examples of the hydraulic material include hemihydrate gypsum, cement, and mortar.

“Hemihydrate gypsum” mentioned here can be easily absorbed by absorbing moisture in the air in addition to semi-water gypsum (CaSO ₄ .1 / 2H ₂ O) such as β-type hemihydrate gypsum and α-type hemihydrate gypsum. Type III anhydrous gypsum (CaSO ₄ ) that changes to hemihydrate gypsum is also included, and anhydrous gypsum other than type III anhydrous gypsum is simply referred to as anhydrous gypsum. As the raw gypsum for calcined gypsum, any of natural products (basaniite etc.), by-product gypsum, and waste gypsum can be used. However, from the viewpoint of production cost, promotion of recycling, environmental protection, etc., part or all of the raw material gypsum is preferably waste gypsum.

Air-hardness is a property that cures by contact with carbon dioxide in the air. Examples of the air hard material include plaster (Ca (OH) ₂ ).

However, the inorganic powder main material (A) is not limited to a hydraulic material or a pneumatic material. For example, a non-hydraulic / non-air-hard material can be used. Examples of non-hydraulic / non-air-hard materials include dihydrate gypsum (CaSO ₄ .2H ₂ O), anhydrous gypsum, calcium carbonate, and the like. From the viewpoint of production cost, promotion of recycling, environmental protection, etc., all or part of the inorganic powder main material (A) is waste gypsum (more specifically, dihydrate gypsum derived from waste gypsum board). Is preferred.

  When the ratio of non-hydraulic / non-air-hard materials in the entire inorganic powder main material (A) is large (specifically, when the ratio of the entire inorganic powder main material (A) is 50% by mass or more) In order to ensure the strength of the coating layer to be formed, it is preferable to add a binder to the composition. This point is described in the section of the binder.

The inorganic powder main material (A) is selected from the group consisting of slaked lime (Ca (OH) ₂ ), magnesium oxide (MgO), quicklime (CaO) and dolomite (CaMg (CO ₃ ) ₂ ). Preferably, the powder is at least one compound. These compounds have the effect of further improving the antibacterial properties of the titanium compound powder (C). Among these, magnesium oxide can maintain the antibacterial property of the titanium compound powder (C) at a high level over a long period of time.

  Since the inorganic powder main material needs to improve the coating property at the time of coating layer formation, it is preferable to make the particle diameter small to a certain extent. By reducing the particle size and improving the coating property, the surface of the coating layer is smoothed (that is, the surface roughness of the coating layer is reduced). Therefore, the glossiness of the coating layer can be further improved in combination with the fibrillation of the cellulose fiber and the addition of the titanium compound powder (C).

  The particle diameter of the inorganic powder main material is not particularly limited. However, it is preferable to use those having a maximum particle size of 1 mm or less and an average particle size of 200 μm or less. By using such a thing, the said coating property improves. The inorganic powder main material having the particle diameter as described above can be obtained by performing pulverization, classification or the like in an inorganic powder main material alone or mixed with other raw materials. Details of the pulverization / classification method will be described in the section of the production method.

[1-2] Fibrous reinforcing material (B):
The fibrous reinforcing material is a fibrous material for improving the strength of the wet coating layer. By adding a fibrous reinforcing material, it is possible to prevent cracks associated with drying and shrinkage in the formed coating layer.

  The composition according to the present invention is characterized in that fibrillated cellulose fibers are used as the fibrous reinforcing material (B). By fibrillating the cellulose fibers, the surface of the coating layer is smoothed (that is, the surface roughness of the coating layer is reduced), and a glossy coating layer can be obtained. It should be noted that the effect of preventing cracking of the coating layer is not reduced by fibrillation.

  Cellulose fibers are composed of fibrils (small fibers) that are focused by hydrogen bonds and intermolecular forces. The term “fibrillation” as used in the present invention refers to fibrillation of cellulose fibers, more specifically, fibrillation by releasing hydrogen bonds and intermolecular forces converging fibrils, and at least one of cellulose fibers. This means that the part is returned to the fibril state. By this fibrillation, the cellulose fibers become ultrafine fibers.

  The kind of fibrillated cellulose fiber is not particularly limited. Commercially available fibrillated cellulose fibers may be used, or cellulose fibers may be fibrillated and used. The fibrillation can be performed by heating the cellulose fiber alone or in a mixed state with other raw materials under acidic or basic conditions at a temperature of 50 ° C. or higher for at least 0.5 hours. As will be described later, when cellulose fibers derived from waste gypsum board are used, the waste gypsum board may be crushed and treated in the same manner. The details of the fibrillation method will be described in the section of the production method.

  When cellulose fibers are fibrillated, the type of cellulose fibers used is not particularly limited. Conventionally known cellulose fibers such as cellulose fibers derived from plants such as wood pulp, cotton and hemp can be used. However, from the viewpoints of production cost, promotion of recycling, environmental protection, and the like, it is preferable that all or part of the fibrillated cellulose fibers are fibrillated cellulose fibers derived from waste gypsum board. Examples of cellulose fibers derived from waste gypsum board include cellulose fibers contained in board base paper and gypsum core (gypsum core portion).

  The fibrous reinforcing material (B) is blended in an amount of 0.1 to 5 parts by mass with respect to 100 parts by mass of the inorganic powder main material (A). By adding 0.1 part by mass or more, the effect of adding a fibrous reinforcing material can be obtained. On the other hand, when the amount is 5 parts by mass or less, the coating property can be improved, and a dense and highly smooth coating layer can be formed. In order to acquire the said effect more reliably, it is preferable to mix | blend 0.1-3 mass parts of fibrous reinforcements (B) with respect to 100 mass parts of inorganic type powder main materials (A). More preferably, 1 part by mass is blended.

[1-3] Titanium compound powder (C):
The composition according to the present invention is characterized in that the titanium compound powder (C) is a constituent component. By using the titanium compound powder as a constituent component, when the coating layer is formed by trowel coating, the cutting of the trowel is improved, and a coating layer having a dense and small surface roughness can be formed. Accordingly, it is possible to obtain a glossy coating layer only by the ironing operation. In addition, “the iron is good in cutting” means that the slurry of the composition according to the present invention obtained by adding water and kneading is well separated from the iron, and the slurry does not cling to the iron. .

  The “titanium compound powder” referred to in the present invention means a powder of at least one compound selected from the group consisting of titanium oxide and titanate.

As the titanium oxide (TiO ₂ ), either anatase type or rutile type may be used. However, when it is desired to impart antibacterial properties to the coating layer, the anatase type having a large band gap and high photocatalytic activity is preferred.

The kind of titanate is not particularly limited. Examples thereof include dizinc titanate (Zn ₂ TiO ₄ ), zinc titanate (ZnTiO ₃ ), zinc oxide-dizinc titanate (ZnO—Zn ₂ TiO ₄ ), and barium titanate (BaTiO ₃ ). .

  The titanium compound powder (C) is blended in an amount of 0.5 to 10 parts by mass with respect to 100 parts by mass of the inorganic powder main material (A). By adding 0.5 part by mass or more, the effect of adding the titanium compound powder (C) can be obtained. On the other hand, a manufacturing cost can be reduced by setting it as 10 mass parts or less. In order to acquire the said effect more reliably, it is preferable to mix | blend 0.5-5 mass parts titanium compound powder (C) with respect to 100 mass parts of inorganic type powder main materials (A).

[1-4] Other components:
The composition according to the present invention may contain components other than the inorganic powder main material (A), the fibrous reinforcing material (B), and the titanium compound powder (C) according to the purpose. Examples of such components include a binder. The binder has an effect of improving the strength of the formed coating layer. The addition of the binder is particularly effective when the ratio of the non-hydraulic / non-air-hardening material in the inorganic powder main material is high.

  The kind of binder is not specifically limited. It is preferable to use an organic polymer binder having a high thickening / binding effect. Examples of the organic polymer binder include starch, cellulose derivatives (such as methylcellulose), vinyl acetate resin, carrageenan, and square corn glue. Among them, vinyl acetate resin, carrageenan, and square glue are preferable because the cutting of the iron during work is good and the coatability is improved.

  The amount of the binder varies depending on the type. However, it is preferable to mix 0.1 to 10 parts by mass with respect to 100 parts by mass of the inorganic powder main material (A). By adding 0.1 part by mass or more, the effect of adding a binder can be obtained. On the other hand, when the content is 10 parts by mass or less, the original humidity control effect of the inorganic powder main material is not impaired. In order to acquire the said effect more reliably, it is still more preferable to mix | blend 3-8 mass parts.

  The composition of the present invention preferably further contains a pigment (D). By blending the pigment, a wall of a desired color can be formed. The kind of pigment is not particularly limited. Conventional inorganic pigments or organic pigments such as iron (II) oxide, iron (III) oxide, and carbon black can be used. As a commercially available pigment, for example, “liquid pigment for KENCOAT” <manufactured by Yoshino Gypsum Co., Ltd.> and the like can be suitably used.

  The preferred blending amount of the pigment varies depending on the type. However, it is preferable to mix 0.1 to 1.8 parts by mass with respect to 100 parts by mass of the inorganic powder main material (A). The coloring effect by a pigment is acquired by mix | blending 0.1 mass part or more. On the other hand, if 1.8 parts by mass is blended, a sufficient coloring effect can be obtained. Even if blended more than this, a coloring effect corresponding to the amount cannot be obtained, which is disadvantageous in terms of cost.

[1-5] Usage method:
The wet coating wall material composition according to the present invention is used as a wet wall material composition slurry (coating wall material) obtained by adding water and kneading. Water may be added in an amount corresponding to the desired coatability, and the amount added is not particularly limited. For example, it is preferable to add water so that the viscosity of the coating wall material is 80 to 300 poise (8 to 30 Pa · s). By setting the viscosity to 80 poise or more, sagging of the coating wall material during coating can be prevented. Therefore, it is possible to form a coating layer with an appropriate coating thickness on an object to be coated (such as a wall). On the other hand, by setting the viscosity to 300 poise or less, it is possible to form a dense coating layer with a small surface roughness because the cutting of the iron is improved when the coating layer is formed by iron coating. In order to obtain the effect more reliably, the viscosity is preferably 120 to 250 poise (12 to 25 Pa · s).

  The solid content concentration of the coating wall material varies depending on the kind and amount of the inorganic powder main material and additives. However, it is preferable to add 10 to 230 parts by mass of water to 100 parts by mass of the wet coated wall material composition to prepare a coated wall material having a solid content concentration of 30 to 95% by mass. When the solid content concentration is within the above range, the coating wall material can be generally adjusted to the above viscosity range. More preferably, 30 to 100 parts by mass of water is added to 100 parts by mass of the wet coated wall material composition to prepare a coated wall material having a solid content concentration of 50 to 80% by mass.

[2] Method for producing wet coating wall material composition or wet coating wall material composition slurry:
The wet coated wall material composition of the present invention can also be produced, for example, by adding cellulose fibers previously fibrillated to the inorganic powder main material (A) and the titanium compound powder (C). However, it is preferable to manufacture by the manufacturing method according to the present invention described below. When the production method according to the present invention is used, a wet coating wall material composition or a wet coating wall material composition slurry can be easily prepared from waste gypsum board.

  The manufacturing method which concerns on this invention is a manufacturing method of the wet coating wall material composition which uses an inorganic type powder main material (A), a fibrous reinforcement (B), and a titanium compound powder (C) as a structural component. The production method according to the present invention includes the fibrillation step (1) as an essential step, and further includes other steps such as a pulverization / classification step (2) as necessary.

[2-1] Fibrilization step (1):
In the fibrillation step (1), water is added to a raw material powder in which at least the fibrous reinforcing material (B) is blended with the inorganic powder main material (A) to prepare a slurry, and the liquidity of the slurry is made acidic. Or it is the process of heating in the state adjusted to basicity, and making a cellulose fiber a fibrillated cellulose fiber.

  The raw material powder is a mixture of at least 0.1 to 5 parts by mass of a fibrous reinforcing material (B) with respect to 100 parts by mass of the inorganic powder main material (A), and further titanium compound powder (C) 0. 0.5-10 mass parts may be mix | blended. When using a raw material powder that does not contain a titanium compound powder, it is necessary to add the titanium compound powder separately after the fibrillation step.

  As the inorganic powder main material (A), the fibrous reinforcing material (B), and the titanium compound powder (C), the materials already described in the section of the composition can be suitably used. As all or part of the inorganic powder main material (A), hydraulic materials such as hemihydrate gypsum, and powders of non-hydraulic and non-air-hard materials such as dihydrate gypsum, anhydrous gypsum, and calcium carbonate are used. Preferable point, it is preferable to use a powder of at least one compound selected from the group of slaked lime, magnesium oxide, quicklime and dolomite, and as titanium compound powder (C), titanium oxide, zinc oxide-dizinc titanate, The point that it is preferable to use at least one titanium compound powder selected from the group consisting of dizinc titanate and zinc titanate is also as already described in the section of the composition.

  However, as a whole or a part of the inorganic powder main material (A), a powder of at least one compound selected from the group of dihydrate gypsum, hemihydrate gypsum and anhydrous gypsum derived from waste gypsum board is used. Cellulose fibers derived from waste gypsum board are preferably used as all or part of the reinforcing material (B). Such a method can produce a wet coated wall material composition mainly using raw materials derived from waste gypsum board, and contributes to recycling of the waste gypsum board. Among them, as the inorganic powder main material (A), only the powder of at least one compound selected from the group of dihydrate gypsum, hemihydrate gypsum and anhydrous gypsum derived from waste gypsum board is used, and the waste gypsum is used as cellulose fiber. It is more preferable to use only cellulose fibers derived from the board.

  As a method for preparing raw material powder from waste gypsum board, for example, (a) waste gypsum board is separated into a gypsum core and board base paper, and each is pulverized to an appropriate size to obtain dihydrate gypsum powder and cellulose fiber powder. And then blending dihydrate gypsum powder and cellulose fiber powder in a prescribed ratio. Further, (b) a method of grinding the waste gypsum board as it is (that is, without separating the base paper for board from the gypsum core) to an appropriate size may be employed. The method (a) is preferable in that the amount ratio of dihydrate gypsum and cellulose fiber can be precisely adjusted. The method (b) is preferable in that the raw material powder can be obtained by only one step of pulverizing the waste gypsum board, and the step is simple.

  The method for pulverizing the waste gypsum board, the gypsum core, and the base paper for board is not particularly limited. A conventionally known pulverizer such as a screw pulverizer (such as a four-axis pulverizer), a hammer mill, a crusher, or a shredder can be used.

  About the waste gypsum board, the gypsum core, and other inorganic powder main materials, it is preferable to use those obtained by removing coarse particles having a particle diameter of 1 mm or more by pulverization / classification in advance. It is preferable to remove the coarse particles in advance, because even if the slurry in the fibrillation step is used as it is as the wet coating wall material composition slurry, it is difficult to cause streaking and the coating property and glossiness are improved.

  The amount of water relative to the raw material powder is not particularly limited. However, when the slurry in the fibrillation step is used as it is as a wet coating wall composition slurry, water is added so that the slurry has a solid content concentration suitable for coating. For example, using a raw material powder in which cellulose fiber and titanium compound powder are blended in an inorganic powder main material, 10 to 230 parts by mass of water is added to 100 parts by mass of the raw material powder, and the solid content concentration is 30 to 95% by mass. It is preferable to prepare a slurry having a solid content concentration of 50 to 80% by mass by adding 30 to 100 parts by mass of water to 100 parts by mass of the raw material powder.

  On the other hand, when the solid content is once taken out from the slurry in the fibrillation step and used for the preparation of the wet coating wall composition after drying, it is not necessary to adjust the amount of water in consideration of the coating property of the slurry, The amount of water may be adjusted in consideration of fluidity at the time of fibrillation. For example, when water is added to raw powder consisting only of pulverized waste gypsum board (gypsum core and board base paper) to form a slurry, which is subjected to a fibrillation process, once the solid content is taken out from the slurry, waste gypsum board It is preferable to add 230 to 900 parts by mass of water to 100 parts by mass to prepare a slurry having a solid content concentration of 10 to 35% by mass.

  Subsequently, it heats in the state which adjusted the liquid property of the slurry to acidic or basic, and makes a cellulose fiber a fibrillated cellulose fiber.

  It is preferable to adjust the liquidity of the slurry to an acidic pH of 1 to 3 or a basic pH of 11 to 13. By making it acidic at pH 3 or lower or basic at pH 11 or higher, fibrillation of cellulose fibers can be advanced.

  The kind of acid and base for adjusting pH is not particularly limited. As the acid for adjusting the pH, conventionally known acids such as hydrochloric acid and sulfuric acid can be used. As the base for adjusting the pH, conventionally known bases such as sodium hydroxide, potassium hydroxide, and calcium hydroxide can be used.

  In the present invention, it is only necessary that the liquidity of the slurry is in the above pH range, and it is not always necessary to add an acid or base for adjusting pH. For example, a basic inorganic powder main material such as magnesium oxide, slaked lime, dolomite, cement, or quicklime may be used, and the pH of the slurry may be adjusted to the above range by the inorganic powder main material. Specifically, 5 parts by mass of cellulose fiber and 500 parts by mass of water are added to 100 parts by mass of the inorganic powder main material consisting of 95 parts by mass of waste gypsum and 5 parts by mass of slaked lime to form a slurry. A method can be mentioned.

  The heating temperature is preferably such that it is boiled from 50 ° C, more preferably 50-80 ° C. By setting the temperature to 50 ° C. or higher, fibrillation of the cellulose fiber can be advanced.

  The heating time is preferably 0.5 to 24 hours. By heating for 0.5 hour or more, the fibrillation of the cellulose fiber can be sufficiently advanced.

  In addition, when coarse particles are mixed in the wet coating wall material composition, it causes streaks during the formation of the coating layer. For example, waste gypsum board often contains coarse particles such as pebbles and sand during recovery. Therefore, it is also preferable to remove dust from the prepared slurry and remove the mixed coarse particles.

[2-2] Grinding / classifying step (2):
The slurry after the fibrillation step can also be used as a wet coating wall composition slurry. In particular, those from which coarse particles having a particle diameter of 1 mm or more have been removed can be suitably used as the slurry.

  However, in the production method according to the present invention, after the fibrillation step (1), the solid content obtained from the slurry is pulverized so as to have a maximum particle diameter of 1 mm or less, and the powder of the wet coating material composition It is preferable to further include a pulverization / classification step (2) for obtaining The pulverization / classification step can prevent the coarse particles from being mixed into the wet coating material composition in the same manner as the above-described dust removal filtration. Moreover, the coating property of the coating wall material is also improved. The pulverization can be performed by a pulverizer exemplified in the section of the inorganic powder main material.

  Furthermore, when the solid content is 15 to 45% in the ratio of particles having an average particle size of about 20 to 200 μm and a particle size of 10 μm or less, the slurry is sticky and it is difficult to finish the coating layer smoothly. Problems can be prevented. Here, the “average particle diameter” is a value measured by a laser diffraction / scattering method.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. However, the present invention is not limited to the configurations of the following examples. In the following description, “parts” and “%” are based on mass unless otherwise specified.

(Example 1-1)
Waste gypsum board was used as a raw material for the inorganic powder main material and cellulose fiber. Specifically, the waste gypsum board was separated into a gypsum core and a base paper for board, and the gypsum core was pulverized by a screw type pulverizer (4-axis pulverizer) to obtain a dihydrate gypsum powder having an average particle size of 30 μm. The board base paper was pulverized with a shredder to obtain a paper powder of 5 mm × 10 mm or less.

  With respect to 100 parts by mass of the dihydrate gypsum powder, 1 part by mass of the paper powder, 5 parts by mass of calcium hydroxide (pH adjuster), and 500 parts by mass of water are added and stirred to disperse the slurry. did. The pH of this slurry was 12.7. The slurry was heated to 100 ° C. and boiled for 2 hours. Thereby, the fibrillation of the cellulose fiber in paper powder was performed.

  Thereafter, the slurry was removed by filtration under reduced pressure, the solid content was dried, and then pulverized by a screw type pulverizer (4-axis pulverizer), and sieved with a sieve having an opening of 1 mm. 1 part by mass of zinc oxide-dizinc titanate and 5 parts by mass of vinyl acetate resin are added to a mixture of 100 parts by mass of dihydrate gypsum and 1 part by mass of fibrillated cellulose fibers thus obtained. By stirring and mixing, the wet coating wall material composition of Example 1-1 was prepared.

(Comparative Example 1-1)
A wet coating material composition was prepared by the same method as in Example 1-1, except that the step of fibrillating cellulose fibers was not performed. Specifically, with respect to 100 parts by mass of the dihydrate gypsum powder, 1 part by mass of the paper powder, 1 part by mass of zinc oxide-dizinc titanate, and 5 parts by mass of vinyl acetate resin are added and stirred and mixed. By doing so, the wet coating wall material composition of Comparative Example 1-1 was prepared.

(Comparative Example 1-2)
A wet coating material composition was prepared by the same method as in Example 1-1, except that the titanium compound powder was not blended. Specifically, 5 parts by mass of vinyl acetate resin is added to a mixture of 100 parts by mass of dihydrate gypsum and 1 part by mass of fibrillated cellulose fibers, and the mixture is stirred and mixed. A coated wall material composition was prepared.

[Evaluation method]
About the wet coating wall material composition of an Example and a comparative example, the following method evaluated.

(1) Coating property:
Water was added to the wet coating wall material compositions of Examples and Comparative Examples so that the solid concentration was 30% by mass to obtain a wet coating wall material composition slurry. A 9.5 mm thick gypsum board (trade name “Tiger Board”, manufactured by Yoshino Gypsum Co., Ltd.) is used as a base material, and the slurry is coated on the surface of the base material with a trowel and dried to give a thickness of 1 mm. A wet coating layer was formed. When this slurry is applied to the base material, the cutting of the iron is good, that is, the slurry and the iron are well separated, and if the slurry is not clinging to the iron, “○”, and if the iron is bad, “×” ".

(2) Glossiness:
When the wet coating layer formed by the evaluation of the coating property was visually observed, “○” when the coating layer surface had gloss (light), “X” when it did not have gloss. As evaluated.

(3) Surface roughness:
The surface roughness of the wet coating layer formed by the evaluation of the coating property was measured with a surface roughness meter (trade name “Small Surface Roughness Measuring Machine Surf Test SJ-310”, manufactured by Mitutoyo Corporation). When the surface roughness was 5.0 μm or less, it was evaluated as a dense and smooth surface, and when it exceeded 5.0 μm, it was evaluated as a rough surface.

  Table 1 shows the compositions and evaluation results of the wet coated wall material compositions of Example 1-1 and Comparative Examples 1-1 to 1-2.

  As is clear from the data shown in Table 1, the composition of Example 1-1 had good coatability and glossiness was recognized in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it was 5 μm or less, and it had a dense and smooth surface.

  On the other hand, the compositions of Comparative Examples 1-1 and 1-2 were poorly cut, had poor coating properties, and no gloss was observed in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it exceeded 5 μm and had a rough surface.

(Comparative Example 2-1)
A wet coating wall material composition was prepared by the same method as in Example 1-1, except that cellulose fibers and fibrillated cellulose fibers were not blended. Specifically, by adding 1 part by mass of zinc oxide-dizinc titanate and 5 parts by mass of vinyl acetate resin to 100 parts by mass of the dihydrate gypsum powder, stirring and mixing, Comparative Example 2- 1 wet coating wall material composition was prepared.

(Examples 2-1 to 2-3, Comparative Example 2-2)
A wet coating material composition was prepared in the same manner as in Example 1-1 except that the amount of fibrillated cellulose was changed depending on the amount of paper powder added in the fibrillation step.

  Table 2 shows the compositions and evaluation results of the wet coated wall material compositions of Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-2.

  As is clear from the data shown in Table 2, the compositions of Examples 2-1 to 2-3 have good coating properties, and glossiness was recognized in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it was 5 μm or less, and it had a dense and smooth surface.

  On the other hand, the composition of Comparative Example 2-1 had good coating properties, but no glossiness was observed in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it exceeded 5 μm and had a rough surface. The composition of Comparative Example 2-2 had poor coating properties, and no glossiness was observed in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it exceeded 5 μm and had a rough surface.

(Examples 3-1 to 3-3, Comparative example 3-1)
A wet coating wall composition was prepared in the same manner as in Example 1-1 except that the amount of zinc oxide-dizinc titanate was changed. Table 3 shows the composition and evaluation results of the wet coating wall material composition.

  As is apparent from the data shown in Table 3, the compositions of Examples 3-1 to 3-3 have good coatability and glossiness was recognized in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it was 5 μm or less, and it had a dense and smooth surface.

  The composition of Comparative Example 3-1 had poor coating properties, and no glossiness was observed in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it exceeded 5 μm and had a rough surface.

(Examples 4-1 to 4-3)
A wet coating wall material composition was prepared by the same method as in Example 1-1, except that the type of titanium compound powder was changed. Table 4 shows the composition and evaluation results of the wet coated wall material composition.

  As is clear from the data shown in Table 4, the compositions of Examples 4-1 to 4-3 had good coating properties, and glossiness was recognized in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it was 5 μm or less, and it had a dense and smooth surface.

(Examples 5-1 to 5-5)
Waste gypsum board was used as a raw material for the inorganic powder main material and cellulose fiber. Specifically, the waste gypsum board is left as it is (that is, without separating the base paper for board from the gypsum core), pulverized by a screw type pulverizer (4-axis pulverizer), and sieved with a sieve having an opening of 1 mm. A mixture of dihydrate gypsum powder and paper powder. The mass ratio of dihydrate gypsum and paper powder was 95: 5.

  To 60 parts by mass of the mixture (57 parts by mass of dihydrate gypsum and 3 parts by mass of paper powder), 43 parts by mass of magnesium oxide and 500 parts by mass of water were added, stirred, and dispersed to obtain a slurry. The pH of this slurry was 12.6. The slurry was heated to 100 ° C. and boiled for 2 hours. Thereby, the fibrillation of the cellulose fiber in paper powder was performed.

  Thereafter, the slurry was removed by filtration under reduced pressure, the solid content was dried, and then pulverized by a screw type pulverizer (4-axis pulverizer), and sieved with a sieve having an opening of 1 mm. Zinc oxide-titanium with respect to a mixture of 100 parts by mass of the inorganic powder main material composed of 57 parts by mass of dihydrate gypsum and 43 parts by mass of magnesium oxide and 3 parts by mass of fibrillated cellulose fibers thus obtained. 1 part by mass of dizinc acid and 5 parts by mass of vinyl acetate resin were added, and the mixture was stirred and mixed to prepare the wet coating wall material composition of Example 5-1.

(Examples 5-2 to 5-5)
A wet coated wall material composition was prepared in the same manner as in Example 5-1, except that magnesium oxide was changed to another inorganic powder main material.
[Evaluation method]
About the wet coating wall material composition of Examples 5-1 to 5-5, in addition to coating property, glossiness, and surface roughness, antibacterial property was evaluated. About antibacterial property, it evaluated by the following method.

(4) Antibacterial properties:
A potato-glucose agar medium (PDA medium) of 2 cm ³ is formed on a 24-well culture plate, and the wet coating material composition and fungal spore solution of Examples 5-1 to 5-5 are mixed and spread on the plate. The results of culturing at 5 ° C. for 5 days were visually observed. Four types of fungi were used: (a) Aspergillus niger FERMS-1, (b) Chaetomlum globosum FERMS-11, (c) PENicillim citrinum FERMS-5, and (d) Rizopus oryzae FERMS-7. A sample in which none of the four types of molds occurred in the culture broth, a case in which any of the four types of molds occurred in the culture broth, and white turbidity was observed in a part of the culture broth, The case where any of the four types of molds occurred in the culture broth and the culture broth was completely cloudy was marked with x.

Table 5 shows the compositions and evaluation results of the wet coated wall material compositions of Examples 5-1 to 5-5.

  As is apparent from the data shown in Table 5, the compositions of Examples 5-1 to 5-4 have good coating properties, and glossiness was recognized in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it was 5 μm or less, and it had a dense and smooth surface. Furthermore, the antibacterial property was excellent.

  The composition of Example 5-5 had good coating properties, and glossiness was recognized in the coating layer. Moreover, when the surface roughness of the coated surface was measured, it was 5 μm or less, and it had a dense and smooth surface. It also showed antibacterial properties. However, compared with the compositions of Examples 5-1 to 5-4, the antibacterial properties were at a low level.

  The wet coating wall material composition and wet coating wall material composition slurry according to the present invention can be suitably used as a composition for wet coating wall materials such as wall coating materials and floor coating materials. The manufacturing method which concerns on this invention can be used suitably for manufacture of the wet coating wall material composition or wet coating wall material composition slurry which concerns on this invention.

Claims (15)

An inorganic powder main material (A), a fibrous reinforcing material (B) made of fibrillated cellulose fibers, and a titanium compound powder (C) made of at least one compound selected from the group consisting of titanium oxide and titanate A wet coating wall material composition comprising, as a constituent component,
All or part of the fibrillated cellulose fiber is a fibrillated cellulose fiber derived from waste gypsum board,
The fibrous reinforcing material (B) is 0.1 to 5 parts by mass and the titanium compound powder (C) is 0.5 to 10 parts by mass with respect to 100 parts by mass of the inorganic powder main material (A). A wet-coated wall material composition characterized by being blended.   2. The wet type according to claim 1, wherein the titanium compound powder (C) is a powder of at least one titanium compound selected from the group consisting of titanium oxide, zinc oxide-dizinc titanate, dizinc titanate and zinc titanate. Painted wall material composition.   The whole or part of the inorganic powder main material (A) is a powder of at least one compound selected from the group consisting of dihydrate gypsum, hemihydrate gypsum, anhydrous gypsum, and calcium carbonate. A wet coating wall material composition.   The wet coating material according to claim 1 or 2, wherein all or part of the inorganic powder main material (A) is a powder of at least one compound selected from the group of slaked lime, magnesium oxide, quicklime and dolomite. Composition. The inorganic powder main material (A), gypsum derived only from waste gypsum board, according to claim 1 or 2 is a powder of at least one compound selected from the group of hemihydrate gypsum and anhydrite Wet coating wall material composition. Furthermore, the wet coating wall material composition as described in any one of Claims 1-5 containing a pigment (D). The wet coating wall material composition slurry formed by knead | mixing the wet coating wall material composition as described in any one of Claims 1-6 , and water. An inorganic powder main material (A), a fibrous reinforcing material (B) made of fibrillated cellulose fibers, and a titanium compound powder (C) made of at least one compound selected from the group consisting of titanium oxide and titanate A method for producing a wet coating wall material composition or a wet coating wall material composition slurry as a constituent component,
A raw material powder in which at least 0.1 to 5 parts by mass of cellulose fiber and 0.5 to 10 parts by mass of the titanium compound powder (C) are blended with respect to 100 parts by mass of the inorganic powder main material (A). Add water to prepare slurry,
The slurry is heated in a state where the liquidity of the slurry is adjusted to be acidic or basic, and the cellulose fiber is made into a fibrillated cellulose fiber which is a fibrous reinforcing material (B), and a fibrillation step (1) is provided. A method for producing a wet coating wall material composition or a wet coating wall material composition slurry. When adjusting the liquidity of the slurry to acidic, the pH is set to 1 to 3, when adjusting to basic, the pH is set to 11 to 13, and the heating is performed at a temperature in the range of boiling from 50 ° C. Item 9. A method for producing a wet coating wall material composition or a wet coating wall material composition slurry according to Item 8. As the titanium compound powder (C), titanium oxide, zinc oxide - titanium dibasic zinc, according to claim 8 or 9 using the powder of at least one titanium compound selected from the group of titanium dibasic zinc and zinc titanate A method for producing a wet coating wall material composition or a wet coating wall material composition slurry. As all or part of the inorganic powder main members (A), gypsum dihydrate, hemihydrate gypsum, any claim 8-10 using powder of at least one compound selected from the group of anhydrite and calcium carbonate A method for producing a wet coating wall material composition or a wet coating wall material composition slurry according to claim 1. As all or part of the inorganic powder main members (A), slaked lime, according to any one of claims 8-10 using a powder of at least one compound selected from the group of magnesium oxide, quick lime and dolomite A method for producing a wet coating wall material composition or a wet coating wall material composition slurry. As all or part of the cellulose fibers, the method of manufacturing a wet coating wallboard composition or a wet coating wall material composition slurry according to any one of claims 8-12 where the cellulose fibers derived from waste plasterboard . As the inorganic powder main material (A), using only the powder of at least one compound selected from the group of dihydrate gypsum, hemihydrate gypsum and anhydrous gypsum derived from waste gypsum board,
Examples cellulose fibers, wet coating wall material composition or a wet coating wall material composition manufacturing method of slurry according to any of claims 8-12 using only cellulose fibers derived from waste plasterboard. After the fibrillation step (1),
The solid obtained from the slurry, the maximum particle size of milled and / or classified so as to 1mm or less, the wet coating wall material composition according to claim powder further comprises a get pulverization and classification step (2) 8 The manufacturing method of the wet coating wall material composition or wet coating wall material composition slurry as described in any one of -14.