JPH0653600B2 - Finish joint material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joint treatment material for an interior undercoat panel of a building or the like, and more specifically, it is preferably used as a top coat for joints and the like. The present invention relates to a finish joint treatment material.

[Prior art and problems to be solved]

BACKGROUND ART Conventionally, as an interior base for buildings and the like, a base panel is connected to a wall surface, and a joint treatment material for the base is filled in a joint portion formed between the base panels, and then a β-type hemihydrate gypsum is placed on this. A base material is used as a base material, and a finish joint treatment material in which a filler, an adhesiveness-imparting agent, a viscosity modifier, a coagulation modifier, a colorant, etc. are appropriately mixed is applied to the base material to finish the joint part smooth. It was

However, since the finishing joint treatment material having such a β-type hemihydrate gypsum as a base material has a low bulk specific gravity of 0.5 to 0.6, the amount of water at the time of kneading increases to 55% to 60%,
Since the amount of water released during drying is large, the joint treatment material becomes thin, and therefore the number of joint treatments is increased to smooth the joints, resulting in poor work efficiency and low surface hardness. There is a problem that the adhesiveness of the decorative material such as cloth is poor.

[Means for solving problems]

Therefore, the finish joint treatment material according to the present invention has a grain size of 0.
~ 297μ range, the bulk specific gravity is 0.9-1.5
The base material is α-type hemihydrate gypsum adjusted so that a filler, an adhesiveness-imparting agent, a viscosity modifier, a coagulation modifier,
It is configured by mixing one or more coloring agents to reduce the thickness of the meat, reduce the number of joint treatments, improve the work efficiency, and improve the adhesiveness to the cosmetic material. To do.

Further, the particle size is in the range of 0 to 297μ, and the α-type hemihydrate gypsum adjusted to have a bulk specific gravity of 0.9 to 1.5 is used as a base material, and the viscosity is 100 parts by weight of the α-type hemihydrate gypsum. 0
In the range of 149 μ, and the bulk specific gravity is 0.5 to
5 to 200 parts by weight of β-type hemihydrate gypsum of 0.6 is mixed, and further one or more of a filler, an adhesiveness-imparting agent, a viscosity modifier, a coagulation modifier, and a colorant are mixed. In this case, the kneading width becomes wider than that of the conventional one, the work efficiency and the adhesiveness are good, and since the β-type hemihydrate gypsum is used together with the α-type hemihydrate gypsum, the economical efficiency is improved.

To explain the present invention in more detail, α-type hemihydrate gypsum or α
In a base material in which β-type hemihydrate gypsum is mixed in a prescribed amount in type hemihydrate gypsum, among calcium carbonate, gypsum dihydrate, stone powder, etc.
One or more or as an adhesiveness-imparting agent,
Any one of starch, vinyl acetate, polyvinyl alcohol, vinyl acetate modified product, acrylic modified product, etc., and carboxymethyl cellulose as a viscosity modifier,
Methylcellulose, sodium polyacrylate, etc., any one kind, citric acid, citrates as a setting agent, any one of protein systems such as gelatin, glue, etc., iron oxide as a colorant as a main component The material is kneaded with a predetermined amount of water.

Since the finishing joint treatment material configured in this way has a crystal structure in which the α-type hemihydrate gypsum is more ordered than the β-type hemihydrate gypsum, since the amount of mixed water is small and the surface hardness is high, The meat is thin and has good adhesion. However, if the particle size of the α-type hemihydrate gypsum is larger than 297 μ, the surface condition becomes rough, and if the bulk specific gravity is too small, the adhesion to the cosmetic material is reduced.

When finishing the surface of the joint part of the interior base panel using the finish joint treatment material obtained in this way, fill the joint part of the base panel with the base joint treatment material in advance and dry it. After that, a finishing joint treatment material is applied to the surface of the base joint treatment material with a spatula or the like to form the surface of the joint portion at the same level as that of the base panel to finish the surface smoothly. Of course, the finishing joint treatment material according to the present invention can also be used, for example, for repairing a gypsum board.

Next, the present invention will be described more specifically by showing examples.

Example 1 First, as shown in Table 1, three kinds of α-type hemihydrate gypsum having different bulk specific gravities and particle size distribution ratios were used as base materials, and a predetermined ratio of additives was mixed into each base material. A finishing base material was prepared (Example and).

Further, as a comparative example, a base material is β-type hemihydrate gypsum, and a base material is a finishing joint treatment material (comparative example) in which a predetermined ratio of additives is mixed in this substrate, and an α-type hemihydrate gypsum having a bulk specific gravity of 0.8. Finishing treatment material (comparative example), finishing finishing treatment material (comparative example) based on α-type hemihydrate gypsum having a bulk specific gravity of 1.5 or more, and α-type semi-water having a particle size of 297μ or more The finishing treatment material (comparative example) which used gypsum as a base material is shown.

In addition, calcium carbonate, polyvinyl alcohol (PVA) methyl cellulose (MC), citric acid, and iron oxide were used as additives.

Each of the mixing ratios from to in Table 1 below was kneaded with water for 2 minutes using a stir bar with a diameter of 10 mm, and the length was 300 mm and the width was 10 mm.
Apply a spatula to finish the joints of the interior base panel set to mm and depth of 10 mm.

Table 2 shows the bulk specific gravity and particle size distribution of the β-type hemihydrate gypsum and α-type hemihydrate gypsum used.

[Example 2] Next, as shown in Table 4, an additive of a predetermined ratio was added to a base material in which β-type hemihydrate gypsum was mixed with α-type hemihydrate gypsum having different bulk specific gravities and particle sizes. Was mixed to prepare 6 types of finishing joint treatment materials. In addition, the test numbers and of Example 1 were used as comparative examples.

In addition, Table-5-1 and Table-5-2 show α-type hemihydrate gypsum and β
It shows the bulk specific gravity and particle size distribution of the mold hemihydrate gypsum.

[Effects of the invention] From the above test results, in the case of the finishing joint treatment material having only the α-type hemihydrate gypsum as the base material, as shown in (Table 3), the bulk specific gravity of the α-type hemihydrate gypsum is It is clear from Comparative Examples (test number and) that the surface is not finished smoothly if the adhesiveness and kneading property are too small, and the bulk density is too large or the particle size is too large. Is less lean than the one using β-type hemihydrate gypsum as the base material (test number), so the joint part that has been preliminarily treated with the joint treatment material for the base should be finished with this joint treatment material for finishing. For example, you only need to work once or twice.
It has an advantage that the work efficiency is extremely improved and the adhesiveness with the decorative material is remarkably excellent, so that the durability of the wall surface is also improved.

Further, as can be seen from the test results (Table 6), the mixture of β-type hemihydrate gypsum with α-type hemihydrate gypsum (test number and) was based on only α-type hemihydrate gypsum (and ), The higher the mixing ratio of β-type hemihydrate gypsum, the lower the surface hardness and adhesiveness, but compared to the one using only β-type hemihydrate gypsum as a base material (Table-3), Clearly, it is close to the numerical value of the one using only α-type hemihydrate gypsum as a base material, so the meat is thin and the kneading width is large, so workability is good, and the adhesiveness to the decorative material is excellent, and the economy is low. It has the advantage of being good.

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Claims (2)

[Claims] 1. An α-type hemihydrate gypsum having a particle size of 0 to 297 μm and a bulk specific gravity of 0.9 to 1.5 is used as a base material, and a filler, an adhesiveness-imparting agent, a viscosity modifier, A finishing joint treatment material, characterized in that one or more of a coagulation modifier and a coloring agent are mixed. 2. A base material is α-type hemihydrate gypsum having a particle size in the range of 0 to 297 μ and a bulk specific gravity of 0.9 to 1.5, and the viscosity is 0 with respect to 100 parts by weight of the α-type hemihydrate gypsum. ~ 149μ
In the range of 5 to 200 parts by weight of β-type hemihydrate gypsum having a bulk specific gravity of 0.5 to 0.6, and further, a filler, an adhesiveness-imparting agent, a viscosity modifier, a coagulation modifier, and a colorant, A finishing joint treatment material, which is characterized by mixing one or more kinds.