JP3135210B2 - Curing method of structure surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for curing a surface of a structure, and more particularly to a method for curing a surface of a structure by forming a peelable film on the surface of the structure by applying a polymer solution for film formation.

[0002]

2. Description of the Related Art In the construction and remodeling work of a structure, the already finished or existing outer surface and inner surface (hereinafter, simply referred to as the structure surface) of the structure are subjected to damage and dirt substances during construction. It is necessary to protect it from adhesion and the like (hereinafter, sometimes referred to as curing). As a conventional method of curing the surface of a structure, a method of curing a surface of the structure by bonding a protective film made of vinyl chloride to the surface of the structure with an adhesive or heat treatment has been implemented. However, this method requires cutting and bonding the protective film according to the shape of the target area on the surface of the structure, and is difficult to apply when the target area is large or has a complicated shape. There is.

The present inventor has developed a method for curing the surface of a structure by applying a polymer solution for forming an adhered film in order to solve the problems of the conventional protective film. Japanese Patent Application No. 7-002820 discloses a method for curing the structure. It has been disclosed as a method for protecting the finished surface. This protection method will be briefly described with reference to FIG. 3. A polymer solution 5 a in which a peelable adhesive film forming polymer 2 a is dissolved in a solvent 9 at the time of finishing each part of the structure to be sequentially finished for each part
Is applied as a thin film 6a to the finishing surfaces 10a, 10b, 10c of the portion, and the thin film 6a is adhered to the finishing surfaces 10a, 10b, 10c of the portion as an adhesive film 7a by evaporation of the solvent 9 so that the entire structure can be removed. After the finishing, the adhesive film 7a is peeled off from all parts. The adhesion film forming polymer 2a can be, for example, one or more polymers selected from the group consisting of polyvinyl alcohol, carboxymethyl cellulose, polyvinyl chloride, acrylic resin, and polyvinyl butyral, and the solvent 9 is water or an organic solvent. be able to.

[0004]

However, when the organic solvent is used as the solvent 9 of the polymer solution 5a in the method for protecting the finished surface in FIG. 3, there is a risk of generating harmful gas and odor during the coating operation on the surface of the structure. Safety confirmation of dangers is indispensable, and specialized knowledge such as special equipment and coating technology is required. Further, when disposing of the used adhesion film 7a after peeling off from the surface of the structure, for example, a harmful gas is generated during incineration, so that a special disposal method may be required. In short, when an organic solvent is used as the solvent 9 of the polymer solution 5a, there is a problem that handling becomes complicated.

On the other hand, when the solvent 9 of the polymer solution 5a in FIG. 3 is water, there is an advantage that complicated handling such as an organic solvent is not required. However, there is a problem that the adhered film 7a formed by the polymer solution 5a composed of only the aqueous solution of the water-soluble polymer is hard and brittle, and is difficult to peel off from the surface of the structure. For example, the adhesive film 7a formed of the polymer solution 5a composed of an aqueous solution of polyvinyl alcohol alone breaks easily when a force is applied for peeling, and it takes time to peel off the structure surface.

Accordingly, an object of the present invention is to provide a method for curing the surface of a structure using a soft and easily peelable aqueous polymer film.

[0007]

Referring to the embodiment of Figure 1 SUMMARY OF THE INVENTION, regimen structure surface of the present invention, the curing target area of the structure surface 1, 5 to 20 wt% of the film-forming polymer 2 and
A coating solution 5 in which 0.5 to 15% by weight of a plasticizer 3 is dissolved in water 4 is applied as a thin film 6 to the polymer, and a drying film 5 is dried to form a peelable transparent film 7 on the surface 1 of the structure. After curing, the transparent film 7 is peeled off from the surface 1 of the structure.

Further, the coating liquid 5 for curing the surface 1 of the structure of the present invention comprises 5 to 20% by weight of a polymer for forming a film with respect to water.
Dissolve 0.5-15% by weight of plasticizer in polymer
And can be applied as a thin film on the surface of a structure and when water evaporates
Can form a transparent film that can be peeled off from the surface.
It is. Preferably, 0.5 to 15 wt% relative to 5 to 20 wt% of polyvinyl alcohol and the polyvinyl alcohol
Of Gurisenrin and / or propylene glycol shall be dissolved in water. The polyvinyl alcohol may have a degree of polymerization of 500 to 5,000, preferably 1,000 to 3,000, and a degree of saponification of 90 to 99 mol%.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The film-forming polymer 2 of the coating solution 5 of the present invention is a polymer which is water-soluble and can form a uniform thin film on the surface of a structure by drying the aqueous solution.
One or two or more substances selected from polyvinyl alcohol (hereinafter sometimes referred to as PVA), carboxymethylcellulose, polyvinyl acetate, and the like, and PVA is particularly preferable. As the plasticizer 3, a substance that is water-soluble and has good compatibility with the polymer for forming a film and gives variability to the film of the polymer for forming a film is used. For example, glycerin, propylene glycol,
One or more substances selected from ethylene glycol and polyethylene glycol, particularly preferably propylene glycol and / or glycerin.

[0010] PVA is a water-soluble polymer used as a material for cosmetics and the like, and glycerin and propylene glycol are also used as materials for cosmetics and the like and have a function of increasing the softness of the film 7 as a plasticizer. However, the film-forming polymer 2 used in the coating liquid 5 of the present invention is not limited to PVA, and forms a film 7 that can be applied as a thin film 6 on the structure surface 1 when dissolved in water 4 and that can be peeled off when the water 4 evaporates. Any water-soluble polymer that can be used is sufficient. Also, the plasticizer 3 is not limited to glycerin or propylene glycol, and any other suitable plasticizer can be selected.

The concentration of the film-forming polymer 2 in the coating liquid 5 can be adjusted according to the material of the surface 1 of the structure and the surrounding environmental conditions, but is preferably 5 to 20% by weight. If the amount is less than 5% by weight, the film 7 may not be formed. If the amount is more than 20% by weight, it is difficult to apply the thin film 6 to the surface 1 of the structure. Further, the present inventors have experimentally found that the concentration of the plasticizer 3 in the coating liquid 5 is preferably 0.5 to 15% by weight based on the polymer 2 for forming a film.

Referring to the embodiment of FIG.
Can be applied to the curing target area on the structure surface 1 by an application method such as brush application, roller application, spraying, squeezing, and the like, and the concentration of the application liquid 5 can be adjusted according to the application method. FIG. 1B shows a curing target area on the surface 1 of the structure where the coating liquid 5 is applied as a thin film 6. The moisture contained in the thin film 6 evaporates after several hours in natural drying, and after 5 to 10 minutes in hot air drying at 40 to 60 ° C., and adheres to the surface 1 of the structure as shown in FIG. The formed film 7 is formed. The coating 7 adheres to the structure surface 1 during the curing period, and protects the area to be cured from the adhesion and damage of the dirt substance 8. The coating liquid 5 of the present invention
The film 7 formed from has a characteristic that even if a part of the film 7 is peeled off from the structure surface 1, the film 7 can be easily re-attached by being pressed against the structure surface 1.

When the film 7 is peeled off from the structure surface 1 after curing, for example, a force can be applied to one end of the film 7 and the film 7 can be peeled off, and no special chemical or complicated equipment is required. The sheet may be peeled after being cut into a suitable size by a cutter. As shown in Table 1, the film without adding the plasticizer 3
While 7a is hard and easily broken, the coating 7 formed from the coating solution 5 of the present invention has flexibility. The film 7 is appropriately stretched by the peeling force and does not break, and can be peeled off at once from the structure surface 1 as shown in FIG. 1 (D). Film 7
If a part of the film 7 has failed to be peeled off, the coating liquid 5 is overcoated on the unstripped film 7 to form a new film 7, and the previously unstripped film 7 can be peeled off together with the new film 7. . Further, it is possible to wash the adhered substance with warm water.
The coating film 7 not only protects the structure surface 1 from dirt adhesion and damage, but also adsorbs dirt substances adhering to the structure surface 1 before the application of the coating liquid 5 and causes the structure surface 1 to become dirty. It also has a purifying function to remove substances.

The peeled film 7 can be reused by dissolving it with, for example, warm water and separating it from contaminants.
No harmful gas is generated when the film 7 is incinerated. Further, the coating device used in the curing method of the present invention can be washed with warm water, and there is no need to use an organic solvent. Therefore, the curing method of the present invention is extremely safe for workers and the environment. Thus, the object of the present invention, that is, "a method for curing the surface of a structure using a soft and easily peelable aqueous solution polymer film" can be provided.

The coating solution 5 of the present invention in which PVA and glycerin and / or propylene glycol are dissolved is a colorless, viscous, transparent liquid, and the coating 7 formed from the coating solution 5 also has high transparency. When the structure surface 1 is made of transparent glass, synthetic resin, or the like (hereinafter, referred to as a transparent body), the coating liquid 5 can be applied without impairing the function of the transparent body. In curing a transparent body such as an outer window and an inner window, the coating liquid 5 of the present invention can be applied without lowering the light collecting property and the transparency. Transparent polyvinyl sheets are used for curing transparent bodies such as windows of buildings in the past, and there was a problem that the light-collecting property and the transparency were remarkably reduced during the curing, but the curing using the coating solution 5 of the present invention. The method can improve the problem. However, it is also possible to mix and color the coating solution 5 of the present invention with an appropriate dye, powder or granules.

The coating film 7 adhered to the surface 1 of the structure is overwritten with various paints or markers 12 as shown in FIG. 2 (A), or a solvent for fire protection or the like as shown in FIG. 2 (B). Can also be overcoated with a spray 13. Further, an insecticide, a bactericide, a fragrance, a bleach and other chemicals can be mixed with the coating solution 5 of the present invention. For example, the coating liquid 5 of the present invention mixed with an insecticide, a bactericide and / or an aromatic is applied to the surface 1 of a structure to which molds, bacteria, algae, etc. are attached, thereby forming a coating 7. At the time of peeling, the algae and the like on the structure surface 1 can be peeled off together to purify the surface 1. Further, since the insecticide and the antibacterial agent leached from the film 7 adhere to the surface 1 of the structure, it is expected that the algae and the like are prevented from adhering to the surface 1 of the structure even after the film 7 is peeled off.

The coating solution 5 of the present invention is applied to the surface 1 of a structure which is finished with glass, synthetic resin, metal, tile, pottery, wood, concrete, paper, rubber, fiber, stone, earth or the like. be able to.

[0018]

EXAMPLES The present inventors investigated the effect of the addition of plasticizer 3 by adding 15% by weight of PVA (Kuraray Co., Ltd., PVA-12) to water.
0, polymerization degree 2,000, saponification degree 98 mol% or more) to prepare a coating solution 5a, and use a part of this coating solution 5a to add 2% and 5% of glycerin. liquid 5 _1,
5 ₂ were prepared and subjected to respectively tensile test for the coating films 7 _1, 7 ₂ made from film 7a and two of the coating solution 5 _1, 5 ₂ created from the coating liquid 5a. Table 1 shows the results. As can be seen from Table 1, compared to the PVA coating 7a without glycerin,
By adding glycerin, the tensile strength of the PVA film 7 decreases, and the elongation at break increases significantly. L ₀ = 100 mm in the column of elongation at break (%) in Table 1 indicates the percentage of elongation by pulling a small piece of 100 mm in%.

[0019]

[Table 1]

[0020]

As described above, in the method for curing the surface of a structure according to the present invention, a coating solution in which a polymer for forming a film and a plasticizer are dissolved in water is applied to the surface of the structure in the form of a thin film. Since a peelable film is formed on the surface of the structure by evaporation to cure the surface, the following remarkable effects are exhibited.

(A) A soft and easily peelable film can be formed
Therefore, peeling of the film from the surface of the structure after the curing period
Work is simplified. (B)Because the transparency of the film is high, windows on the outside and inside of the building
When curing the transparent body, do not lower the lighting and transparency.
No.  (C) Dissolve the film after peeling off the structure surface in warm water
Can be reused. Harmful gas even if incinerated
Does not occur. (D) Polyvinyl alcohol and glycerin or propylene
The coating solution in combination with glycol is suitable for workers and the environment.
High safety and easy handling.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of another embodiment of the present invention.

FIG. 3 is an explanatory diagram of an example of a conventional method for protecting the surface of a structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Structural surface 2 ... Film forming polymer 2a ... Adhesive film forming polymer 3 ... Plasticizer 4 ... Water 5 ... Coating liquid 5a ... Polymer solution 6,6a ... Thin film 7 ... Coating 7a ... Adhering film 8 ... Dirt substance 9 ... Solvent 10 ... Finished surface 12 ... Marker 13 ... Spray.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-125095 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 21/02 104 E04G 21/24 E04G 21 / 30 B08B 17/02 C11D 7/00

Claims (5)

(57) [Claims] (1) 5-20% by weight of the surface of the structure to be cured
The film-forming polymer and the film-forming polymer of 0.
A coating liquid in which 5 to 15% by weight of a plasticizer is dissolved in water is applied as a thin film, and the coating liquid is dried to form a peelable transparent film on the surface of the structure to cure the surface. A method for curing the surface of a structure, wherein the transparent film is subsequently peeled off from the surface of the structure. 2. The method for curing a surface of a structure according to claim 1, wherein said polymer for forming a film is polyvinyl alcohol, and said plasticizer is glycerin and / or propylene glycol. 3. A film-forming polymer of 5 to 20% by weight with respect to water and a plasticizer of 0.5 to 15% by weight with respect to the film-forming polymer are dissolved to form a thin film on the surface of a structure. A coating liquid for curing the surface of a structure capable of forming a transparent film that can be peeled off from the surface when water evaporates. 4. A polyvinyl alcohol of 5 to 20% by weight based on water and 0.5 to 15% by weight of polyvinyl alcohol.
And a glycerin and / or propylene glycol. The coating liquid for curing the surface of a structure, which can be applied as a thin film on the surface of the structure and can form a transparent film that can be peeled off from the surface when water evaporates. 5. The coating liquid for curing according to claim 3 or 4 ,
A coating liquid for curing the surface of a structure, comprising a mixture of an insecticide, a bactericide and / or an aromatic.