JPS62260870A - Sealer composition for inorganic porous substrate - Google Patents

Abstract

PURPOSE:To provide the title compsn. which has excellent safety and gives a coating film having excellent reinforcibility, durability, etc., containing a water-soluble resin obtd. by copolymerizing a monomer having a carboxyl group with a monomer having an epoxy group and other monomer in a specified weight ratio. CONSTITUTION:2-40wt% polymerizable monomer (A) having a carboxyl group (e.g., acrylic acid), 0.1-20wt% polymerizable monomer (B) having an epoxy group (e.g., glycidyl acrylate) and 40-97.9wt% other polymerizable monomer (C) (e.g., methyl acrylate) are used in such a proportion that the combined amount of the components A, B and C is 100wt% to copolymerize them. The resulting water-soluble resin is used as an essential ingredient and additives such as a pigment, a filler, etc. are added thereto to obtain the desired sealer compsn. for inorg. porous substrates. The compsn. is non-toxic, has no fear of catching a fire and penetrates well into substrates such as mortar, concrete, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sealer composition for inorganic porous substrates. More specifically, inorganic porous Lt materials, such as inorganic porous Lt materials, which when used in base materials such as mortar and concrete, impregnate well and provide a coating film with excellent reinforcing properties, durability, and suitability for overcoating. 'I relates to a sealer composition for base materials.

(Prior art and problems to be solved by the invention) Conventionally, moisture-curing urethane, solvent-based resins, etc. with relatively low molecular weights have been used as resins for inorganic porous sealers. The former has become a problem due to its 11X property, and the former has become a problem due to the risk of fire and environmental pollution due to the use of organic solvents, and there is a strong demand for water-based products. As water-based sealers, various types of sealers based on water-soluble resins and water-dispersible resins have been studied. Currently, there are no water-based sealers available that are important for long-term durability, as the ingredients have poor Ω temperature resistance and adhesion to the base material.

(Technical Means for Solving the Problems) The present invention solves the above-mentioned problems, namely, the thermal properties of sealers whose main components are moisture-curing urethane, solvent-based resins, etc., the danger of fire, and the environmental pollution. This solution solves the problems of water-based sealers such as water resistance, poor impregnation, and insufficient adhesion all at once.

That is, the present invention provides 2 to 40 polymerizable 1m bodies (a) containing carboxyl groups.
ffiffi%, polymerizable monomer containing epoxy group (
b) 0.1 to 20% polymerizable monomer (c
)40 to 97.91M% (however, (a) + (b) +
(c) is 100% by weight)) is added to a sealer composition for inorganic porous substrates containing as an essential component a water-soluble resin (I) obtained by polymerizing I! I'rj.

Since the sealer composition for inorganic porous substrates of the present invention contains water-soluble resin (I) as a main component, it has extremely excellent impregnation properties into inorganic porous substrates. Moreover, the water-soluble resin (I) contains carboxyl groups and epoxy groups in its molecules, and during the film forming process, epoxy groups or carboxyl groups and epoxy groups crosslink to form a cured film. , has excellent durability.

The carboxyl group-containing polymerizable monomer (a) used in the present invention is not particularly limited as long as it is a polymerizable monomer having a carboxyl group in the molecule, such as acrylic acid, methacrylic acid, crotonic acid, itacon acid, unsaturated carboxylic acids such as maleic acid and monomethyl maleate, or derivatives thereof, and one selected from these groups.
Seeds or mixtures of two or more types can be used. The monomer (a) is an essential component for imparting water solubility to the polymerized resin and for crosslinking with epoxy groups, and is used in an amount of 2 to 40% by weight. If the amount used is less than 2% by weight, the resulting alrt will be water-soluble (on the contrary, it will be 40% by weight).
It is not preferable to use a large amount of ω in excess of ω because the water resistance decreases.

Polymerizable monomer containing epoxy group used in the present invention (
b) is not particularly limited as long as it is a merging monomer having an epoxy group in the molecule, examples include glycidyl acrylate, glycidyl methacrylate, and allyl glycidyl ether, and one selected from these groups or A mixture of two or more types can be used. The monomer (
b) is an essential component for improving the adhesion of the resin to the substrate and crosslinking the resins with each other or with carboxyl groups, and is used in an amount of 0.1 to 20% by weight.

If the amount used is less than 0.1% by weight, it will not be effective for improving adhesion or imparting crosslinking reactivity;
If it is used in an amount exceeding fji%, the storage stability of the liquid will decrease, which is not preferable.

Other polymerizable monomers (C) that can be used in the present invention are not particularly limited as long as they are copolymerizable with the polymerizable TP m forms (a) and (b), such as methyl acrylate. , rate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate-1, styrene, α-chlorostyrene, vinyltoluene, vinyl fluoride, vinyl chloride, acryloni-1 - Ryl, mekkuri nitrile, vinyl acetate, vinyl propionate, acrolein, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, acrylamide, methacrylamide, dimethylaminoethyl acrylate and dimethylaminoethyl methacrylate, etc. One type or a mixture of two or more types selected from these groups can be used.

The water-soluble resin (I) which is an essential component of the sealer composition for inorganic porous substrates of the present invention is composed of the above polymerizable monomers (a) and (b).
) and (C) by aqueous solution polymerization according to known procedures. As the polymerization initiator, known water-soluble or water-dispersible polymerization initiators such as ammonium persulfate, potassium persulfate, hydrogen peroxide, and butyl hydroperoxide can be used.

The water-soluble resin (1) can also be produced by solution polymerizing in a water-soluble organic solvent and then diluting with water. Examples of solvents that can be used in this case include methyl alcohol, ethyl alcohol, n-butyl algol, isobutyl alcohol,
Examples include n-propyl alcohol, isopropyl alcohol, methyl ethyl ketone, methyl isobutyl ketone, ethylene glycol, propylene glycol, ethylene glycol monomethyl ether, etc., and one type or a mixture of two or more types selected from these groups is used. I can do that. Further, as the polymerization initiator, known polymerization initiators such as azobisisobutyronitrile, benzoyl peroxide, butyl hydroperoxide, etc. can be used.

After the water-soluble resin (I) is polymerized according to the above procedure, it may be neutralized with a basic compound if necessary. Examples of basic compounds that can be used include ammonia, trimethylamine, triethylamine, dimethylethanolamine, diethylethanolamine, triethanolamine, putrium hydroxide, and potassium hydroxide, and one or more of these can be used. Mixtures can be used.

The sealer composition for inorganic porous substrates of the present invention may be composed only of the water-soluble resin (I), but if necessary, known additives such as pigments, fillers, toners, wetting agents,
It is free to add antistatic agents and the like. It is also possible to add a polyamine or the like to promote cross-linking.

(Effects of the Invention) Since the sealer composition for inorganic porous substrates of the present invention contains the water-soluble resin (I) as an essential component, it does not pose any problems such as toxicity, fire danger, and environmental pollution. When the sealer composition is applied to an inorganic porous substrate such as a mortar surface, a concrete surface, or a slate substrate, it is well impregnated into the substrate and is not contained in the water-soluble resin (I) which is an essential component. Due to its specific functional groups, it has extremely excellent adhesion to substrates, durability, and suitability for overcoating, and it overcomes the problems of conventional sealers whose main ingredients are solvent-based resins or water-based resins. It was resolved all at once.

Therefore, the inorganic porosity of the present invention: ? l! The material sealer composition can be suitably used for outdoor repairs such as mortar surfaces, concrete surfaces, exterior walls, and roofs. Also, wall materials, slate tiles, etc. are strong! It can also be used after drying. Furthermore,
It can also be used as a brimer when using paints for various inorganic porous substrates, such as paints using acrylic resins, vinyl acetate resins, or urethane resins as binders.

(Examples) Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited to the following Examples. In addition, all parts in the example are based on one hanging.

[Example 1] After charging 100 parts of ethylene glycol monobutyl ether into a four-eye flask equipped with a stirrer, a reflux condenser, a dropping funnel, and a temperature meter, nitrogen gas was blown into the flask. The temperature was raised to 80°C. Thereafter, a mixture of 2.5 parts of azobisisobutyronitrile dissolved in a polymerizable monomer mixture consisting of 15 parts of methacrylic acid, 10 parts of glycidyl methacrylate, 40 parts of styrene, and 35 parts of ethyl acrylate was uniformly mixed over 2 hours. dripped. Thereafter, the reaction was further carried out at 80°C for 2 hours. After cooling, 12 parts of 25% aqueous ammonia was added, and further 285.5 parts of water were added to give 1 q of sealer composition (1). 1!7 The sealer composition (1) was applied to the inorganic porous substrate shown in Table 1 for 50 minutes.
After applying CJ/rrt2 and drying at room temperature for 3 days, the adhesion and water resistance of the resulting film were examined. The result is the first
It was as shown in the table.

[Example 2] The m-composite jti a-temperature mixture used in Example 1 is made of 5 parts of itaconic acid, 1-10 parts of glycidyl methacrylate, 50 parts of styrene, and 35 parts of butyl acrylate (
However, itaconic acid was preliminarily dissolved in ethylene glycol monobutyl ether. The same operations as in Example 1 were repeated except for ) to form a film of sealer composition (2).The adhesion and water resistance of this film were as shown in Table 1.

[Example 3] After 200 parts of ion-exchanged water was charged into a Yotsuro flask equipped with a stirrer, a reflux condenser, a dropping funnel, and a thermometer, the temperature was raised to 70° C. while stirring while blowing nitrogen gas. Thereafter, a polymerizable suspension mixture consisting of 25 parts of acrylic acid, 15 parts of glycidyl acrylate, 30 parts of methyl methacrylate-h, and 30 parts of methyl acrylate was uniformly dropped over 2 hours. At the same time, 40 parts of a 10% ammonium persulfate aqueous solution was uniformly dropped over 2 hours.

Thereafter, the reaction was further carried out at 70°C for 2 hours. After cooling, 24 parts of 25% ammonia water was added to make 1 part of the sealer composition (3).
It's 9. 1. 30 g/m2 of the smoothed sealer composition (3) was applied onto the inorganic porous substrate shown in Table 1, and after drying at room temperature for 3 days, the adhesion and water resistance of the resulting film were examined. Ta. The results were as shown in Table 1.

[Comparative Example 1] The same operation as in Example 1 was repeated except that the polymerizable m-isomer mixture used in Example 1 was changed to 115 parts of methacrylic, 40 parts of styrene, and 45 parts of ethyl acrylate.
The coating of comparative composition (1) was 19. The adhesion and water resistance of this film were as shown in Table 1.

(Comparative Example 2) The same operation as in Example 1 was repeated except that the small metallic monomer mixture used in Example 1 was changed to 15 parts of methacrylic acid, 25 parts of glycidyl methacrylate, 30 parts of styrene, and 30 parts of ethyl acrylate. A comparative composition (2) was obtained.When this composition (2) was left at room temperature, it slowly thickened and gelled after one week.

[Comparative Example 3] In Example 1, the polymerizable hanging body mixture was mixed with methacrylic acid 4
A film of Comparative Composition (3) was obtained by repeating the same operation as in Example 1, except that 5 parts of glycidyl methacrylate, 1.10 parts of glycidyl methacrylate, 10 parts of styrene, and 35 parts of butyl acrylate were used. The adhesion and water resistance of this coating were as shown in Table 1.

Table 1 Test method Adhesion 2 Cut the film with a cutter knife at 10x1 intervals.
A polyester adhesive neck tape was applied by cutting a 0 mark and then peeled off to examine the remaining state of the film.

O: The film does not peel off at all △: The film partially peels off ×: The film completely peels off Water resistance: Each test piece on which the film was formed was placed at room temperature. After immersing in pure water for 7 days and then drying at room temperature for 2 days, adhesion was examined in the same manner as above.

O...The target l19 does not peel off at all Δ...
・Partially peeled off the coating ×・・・Procedures in which the coating completely peeled off (Voluntary) 1988
August 5th

Claims (1)

[Claims] 1. Carboxyl group-containing polymerizable monomer (a) 2-
40% by weight, epoxy group-containing polymerizable monomer (b) 0.1 to 20% by weight, and other polymerizable monomers (c) 40 to 97.9% by weight (However, (a) + ( b) + (c) is 100% by weight.) A sealer composition for an inorganic porous substrate, which contains as an essential component a water-soluble resin (I) obtained by polymerizing .