JPH0525898A - Surface preparation agent and execution of work therewith - Google Patents

Abstract

PURPOSE:To improve adhesiveness and efficiency in execution of work by preparing, in specified composition, surface preparation agent comprising agents for rough coating and for finish coating, and by employing such agent for interior finishing for a building. CONSTITUTION:Surface preparation agent is composed of preparation agent for rough coating mainly composed of anhydrous gypsum, alkaline earth metal or the like and preparation agent for finish coating mainly composed of gypsum hemihydrate. The preparation agent for rough coating is made such that is composed of alum, K2SO4, or such that includes double salt thereof, and is further composed, in order to improve adhesiveness, of polyvinyl alcohol or the like, or its copolymer. Then the preparation agent for rough coating is buried and applied to the surface of a ground material and after that, the preparation agent for finish coating is applied in lamination. Thereby adhesiveness is improved and thinning arising from shrinkage of volume can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is to embed / apply on the surface or joints of a base material such as gypsum board, plywood, calcium silicate board, and asbestos straight board to smooth the surface irregularities, and The present invention relates to a ground control agent for adjusting the material surface.

[0002]

2. Description of the Related Art In recent years, in the interior work of buildings, a dry method using a gypsum board, a plywood, a calcium silicate board, and an asbestos slate board has become popular. After that, the interior finish is often done with wallpaper and painting,
For this reason, the use of the base conditioner is increasing.

As for the transition of the undercoating agent, the plywood undercoating was the mainstream before the 1940's, and therefore the undercoating preparation containing calcium carbonate and vinyl acetate resin or acrylic resin as the main components, which can obtain good adhesion with the plywood undercoating. Agents were the mainstream.

[0004] In the 1950s, gypsum board became the mainstream, and thus ground control agents mainly composed of hemihydrate gypsum and powdered resin became mainstream. The reason for this is that the number of buildings that perform wallpaper finishes has increased, so shortening the construction period and process has become a major issue for wallpaper installers. From this, by using a ground control agent mixed with hemihydrate gypsum, the number of times of application is reduced (because the rate of volume reduction occurring during drying is reduced), and the time to move to the next step is shortened (joint treatment agent This is because by setting the curing time (curing time of the hemihydrate gypsum) as the transition time to the next step, the conventional step of drying the undercoating agent can be omitted). Furthermore, from this time, the undercoating agent was divided into three types, one for undercoating, one for topcoating, and one for both top and bottom, depending on the purpose of use, and both undercoating and topcoating were used, or only the one for both top and bottom was used. . In general, the powder resin has the highest compounding amount in the top coat, followed by the upper / lower combined type and the lower coater.

In the Heisei Era, buildings made of plywood, wood, and gypsum board came to be used. When the undercoat conditioner for undercoating and the undercoat conditioner for overcoating were used to adjust the groundwork, plywood The problem that the undercoating agent peels off at the wood and wood parts has come to occur. This is because there is a difference in the adhesive strength of the ground control agent between gypsum board and plywood or wood, and hemihydrate gypsum itself contributes to the adhesion on the ground of gypsum board, but on the ground of plywood or wood This is because water gypsum rarely contributes to the adhesiveness, and it becomes necessary to bond mainly with powdered resin.

[0006] Therefore, for a building in which gypsum board and plywood are used together, a topcoat undercoating agent containing a large amount of powdered resin is used, or vinyl acetate resin or the like is mixed with the undercoating undercoating agent at the time of use. It becomes necessary to cover the shortage of resin. If such a thing is performed, the squeeze becomes large, so that the number of times of applying the undercoating agent is increased, and as a result, the work period and the process are often increased.

[0007] Further, the base conditioning agent containing hemihydrate gypsum as a main component, due to the nature of hemihydrate gypsum, requires a large amount of water to be kneaded with water to form a paste when used for the ground treatment. Therefore, it takes a long time to completely dry, and the strength of the resin, which is the adhesive component, is delayed to develop, and the water necessary for curing is dried before the hemihydrate gypsum hardens in the part with a thin coating thickness. Then, it becomes dry out, and problems such as a decrease in adhesiveness to the base and a poor adhesion of the base coater for top coating are likely to occur.

[0008]

As a result, when a wallpaper is applied to a wall surface whose base is adjusted by using a base adjusting agent for undercoating and a base adjusting agent for topcoat in combination using a hemihydrate gypsum, between the base adjusting agents,
There is a problem that the undercoating base control agent peels off from the base.

In order to solve such a problem, the first condition is to increase the amount of the powdered resin which is an adhesive component and to reduce the amount of water mixed in forming a paste (improvement of adhesiveness). The second condition (improvement in construction efficiency) is to enable the shift to the next process in a short time.

It is an object of the present invention to obtain an undercoating agent having improved adhesiveness and working efficiency, and a method of applying the undercoating agent.

[0011]

The base conditioning agent according to the present invention comprises an undercoating base conditioning agent containing anhydrous gypsum and a sulfate of an alkali metal or an alkaline earth metal as main components, and a hemihydrate gypsum as a main component. And a ground control agent for overcoating. Specifically, the undercoat base conditioning agent is aluminium, as the alkali metal or alkaline earth metal sulfate,
K ₂ SO ₄ , Al ₂ (SO ₄ ) ₃ , Na ₂ SO ₄ , (NH ₄ ) ₂ SO ₄ , MgSO ₄ , ZnS
Disclosed is one containing O ₄ , FeSO ₄ or a double salt thereof.

Further, as the powdered resin for improving the adhesiveness with the base material, the powdered resin is polyvinyl alcohol, methyl cellulose,
Disclosed are those containing soluble starch, vinyl acetate resin, ethylene-vinyl acetate copolymer resin, vinyl acetate-vinyl persatate copolymer resin, acrylic resin, or copolymers or blends thereof. In addition, as a preferable example,
As inorganic filler, bentonite, talc, kaolin,
Disclosed is an undercoat primer or an overcoat primer containing any one or more of acid clay, leucite, perlite, balloons, calcium carbonate, and mica.

Further, in the method of applying a ground control agent according to another invention, anhydrous gypsum and an alkali metal or alkaline earth are used on the surface or joint portion of a ground material such as gypsum board, plywood, calcium silicate board, and asbestos straight board. It is a method of embedding and applying an undercoating base conditioning agent containing a metal sulfate as a main component, and then laminating and applying a topcoating base conditioning agent containing hemihydrate gypsum as a main component on the undercoating base conditioning agent. .

[0014]

In the present invention, it is composed of an undercoating base conditioner containing anhydrous gypsum and a sulfate of an alkali metal or an alkaline earth metal as main components and a topcoating base conditioner containing hemihydrate gypsum as a main component. In addition, after embedding and applying an undercoating base conditioner mainly composed of anhydrous gypsum and a sulfate of an alkali metal or an alkaline earth metal on the surface or joint portion of the base material, hemihydrate gypsum is mainly used. In this method, the undercoating conditioner as a component is laminated and coated on the undercoating conditioner. That is, the amount of water mixed with anhydrous gypsum was about half that of hemihydrate gypsum (β type), and it was possible to reduce the amount of water mixed with the undercoat primer. For this reason, the adhesiveness is improved, and the moisture is less likely to evaporate during drying to cause volume contraction (erase).

Furthermore, the alkali metal or alkaline earth metal sulphate in the primer for undercoating is used not only for the anhydrous gypsum in the primer for undercoating but also for the hemihydrate gypsum in the primer for undercoating. It is a solidification accelerator that cures. Therefore, by laminating and coating the undercoating undercoating agent on top of the undercoating undercoating agent, the overcoating undercoating agent is rapidly cured, and the surface of the undercoating agent has the same hardness as the finished surface. In addition, the undercoat primer is below the overcoat primer,
The alkali metal or alkaline earth metal sulfate reacts slowly with the anhydrous gypsum to cure slowly, and as described above, there is almost no volume shrinkage of the undercoat primer. Therefore, it is not necessary to repeatedly apply the undercoating agent on several layers,
It is possible to improve the construction efficiency and shorten the construction period.

It should be noted that the sulfate in the undercoat primer may be any as long as it reacts with anhydrous gypsum to cause a setting reaction, specifically, alum, K ₂ SO ₄ , Al ₂ (SO ₄ ) ₃ , Na ₂ SO ₄ , (NH ₄ ) ₂
SO _4, is MgSO _4, ZnSO _4, FeSO ₄ and their double salts, preferably formulated from 0.5 to 10% of the primer for base adjustment agent.

Further, as the undercoating base preparation agent to which a powdered resin for improving the adhesiveness with a wood-made base material is added, the powdered resin is polyvinyl alcohol, methyl cellulose, soluble starch, vinyl acetate resin, It is an ethylene-vinyl acetate copolymer resin, a vinyl acetate-vinyl persatate copolymer resin, an acrylic resin, and a copolymer or a mixture of a plurality of these.

Further, an inorganic filler is added to the undercoating undercoating agent or the overcoating undercoating agent as a strength-imparting agent for reducing the volume reduction rate, adjusting the pseudo-hardening property, adjusting the workability and wetting. Preferably, any one or more of bentonite, talc, kaolin, acid clay, hirucite, perlite, balloon, calcium carbonate and mica is disclosed.

Further, as the anhydrous gypsum in the undercoating base preparation agent, natural anhydrous gypsum or one burned at 500 ° C. or higher,
Disclosed is a mixture of 40% by weight or more of a base conditioning agent for undercoat. On the other hand, as hemihydrate gypsum for topcoat undercoat, α-type hemihydrate gypsum and β-type hemihydrate gypsum
Disclosed is a composition containing at least%.

If the undercoating base preparation is provided with pseudo-curability (hardness such that the shape does not collapse even if it is squeezed from above with a spatula), the undercoating base preparation will be in an uncured state. Even if there is, it is possible to apply the undercoating conditioner for the overcoat, and the undercoating conditioner for the undercoat that uses anhydrous gypsum can be adjusted so that it cures in one day. The strength of the adjusting agent is not inferior to that using hemihydrate gypsum.

The same effect can be expected by using cement, lime, or calcium carbonate instead of anhydrous gypsum as the undercoating base conditioner, but since cement and lime have strong alkalinity and attack plywood and wood, interior decoration is possible. Is unsuitable for use as a ground control agent, and non-curable calcium carbonate and other inorganic substances leave moisture in them, which adversely affects the adhesive strength with the base material and is not preferable.

[0022]

EXAMPLES Specific examples will be described below. The following Table 1 shows the formulations of Examples and Comparative Examples of the undercoating base modifier.

[0023]

[Table 1]

The hemihydrate gypsum used was one to which a retarder was added so that it could be cured in 2 hours. The following Table 2 shows the formulations of Examples and Comparative Examples of the undercoating conditioner for top coating.

[0025]

[Table 2]

Similar to the above, the hemihydrate gypsum used was one to which a curing retarder was added so as to cure in 2 hours. Table 1
And the state of the undercoating conditioner was examined by combining the undercoating undercoating conditioner and the overcoating undercoating conditioner shown in Table 2. Table 3 below
Indicates a combination.

[0027]

[Table 3]

The following Table 4 shows the states of the base conditioning agents of the combinations shown in Table 3.

[0029]

[Table 4]

The "pseudo-curing time" in the table means the time until pseudo-curing when the undercoating base control agent is applied to a groove having a gap of 5 mm on a gypsum board (V-cut joint). Immediately after that, the base preparation agent for top coating is applied. "Curability of top coat" means the time until the base coat preparation for top coat applied to this test sample is completely cured (when it is not using hemihydrate gypsum, it is dried and cured), and it is further dried for 1 day and dialed. The value measured with a gauge is shown as "presence / absence", and the cured state of the undercoat base preparation agent is shown as "curability of undercoat".
Next, a 3/100 gradient was applied to the surface of the gypsum board to apply the undercoat primer, and the next day, the overcoat primer was adjusted to 1 m.
It is applied at a coating thickness of m and dried for 1 day. A vinyl wallpaper was attached to this test body, and it was peeled off once at an arbitrary time and then re-attached, and the wallpaper was peeled off the next day to observe the adhesion state, and the result is shown as "wallpaper compatibility".

As described above, in the embodiment in which the undercoating base conditioner containing anhydrous gypsum and alum as the main components and the topcoating base conditioner containing hemihydrate gypsum as the main component were laminated and applied, It can be seen that both the curability and the wallpaper compatibility are good.

[0032]

Industrial Applicability As described above, the present invention provides an undercoating base conditioner containing anhydrous gypsum and a sulfate of an alkali metal or an alkaline earth metal as a main component, and a topcoating base containing hemihydrate gypsum as a main component. It is composed of an adjusting agent, and further, after embedding and applying an undercoating base adjusting agent mainly composed of anhydrous gypsum and a sulfate of an alkali metal or an alkaline earth metal on the surface or joint portion of the base material, It is a method of laminating and applying an undercoating conditioner mainly composed of hemihydrate gypsum on the undercoating conditioner. That is, the amount of water mixed with anhydrous gypsum is equivalent to hemihydrate gypsum (β
It is about half of that of the base type), and it has made it possible to reduce the amount of water mixed with the undercoat primer. Therefore, the adhesiveness is improved,
It prevents the water from evaporating and causing volumetric shrinkage (drying) during drying.

Furthermore, the alkali metal or alkaline earth metal sulphate in the primer for undercoating is used not only for the anhydrous gypsum in the primer for undercoating but also for the hemihydrate gypsum in the primer for undercoating. It is a solidification accelerator that cures. Therefore, by laminating and coating the undercoating undercoating agent on top of the undercoating undercoating agent, the overcoating undercoating agent is rapidly cured, and the surface of the undercoating agent has the same hardness as the finished surface. In addition, the undercoating base conditioning agent is a lower part of the topcoating undercoating conditioning agent, and is gently cured by the reaction between the alkali metal or alkaline earth metal sulfate and anhydrous gypsum. Almost no volume shrinkage. Therefore, it is not necessary to repeatedly apply the undercoating agent on several layers,
There is an effect that the construction efficiency can be improved and the construction period can be shortened.

Claims (6)

[Claims] 1. A ground control agent for undercoat, which comprises anhydrous gypsum and a sulfate of an alkali metal or an alkaline earth metal as main components,
An undercoating conditioner comprising a hemihydrate gypsum as a main component and an overcoating undercoating conditioner. 2. The undercoating undercoating agent is aluminium, K ₂ as the alkali metal or alkaline earth metal sulfate.
SO ₄ , Al ₂ (SO ₄ ) ₃ , Na ₂ SO ₄ , (NH ₄ ) ₂ SO ₄ , MgSO ₄ , ZnSO
_4. The base conditioning agent according to claim 1, which contains ₄ , FeSO _4, or a double salt thereof. 3. The undercoating agent according to claim 1, wherein the undercoating undercoating agent contains a powdered resin for improving the adhesion to the undercoating material. 4. As the powder resin, polyvinyl alcohol, methyl cellulose, soluble starch, vinyl acetate resin, ethylene-vinyl acetate copolymer resin, vinyl acetate-vinyl persatate copolymer resin, acrylic resin, or a copolymer thereof or The ground control agent according to claim 3, which comprises a plurality of formulations. 5. The base coat adjusting agent for undercoating or the base coat adjusting agent for top coat as an inorganic filler, any one of bentonite, talc, kaolin, acid clay, leucite, perlite, balloon, calcium carbonate and mica. The ground control agent according to claim 1, which comprises one or more. 6. A gypsum board, plywood, calcium silicate board,
After embedding and applying an undercoating base conditioner composed mainly of anhydrous gypsum and a sulfate of an alkali metal or alkaline earth metal on the surface or joint portion of a base material such as an asbestos straight board,
A method of applying an undercoating agent, characterized in that an undercoating undercoating agent containing hemihydrate gypsum as a main component is laminated and applied onto the undercoating undercoating undercoating agent.