JPS584748B2 - Tomakubousuiyososeibutsu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composition for waterproofing a structure, and in particular, it prevents the waterproof layer from breaking even when a structural crack occurs in the structure, and improves the beauty of the structure. A composition for waterproofing a paint film that can form a waterproof paint film that can also be used as a finishing film.

Water-permeable parts such as rooftops, walls, and floors of buildings must be treated with appropriate waterproofing. Conventionally used methods for waterproofing these surfaces include asphalt waterproofing, sheet waterproofing, and cement. There are waterproofing methods, waterproofing methods using synthetic resin emulsions, etc., but the waterproofing method using synthetic resin emulsions has good workability, and has the advantage that the waterproof membrane formed can also have an aesthetic finish. However, the paint film tends to sag during construction, the paint film lacks alkali resistance and weather resistance, and if structural cracks occur in the structure, the waterproofing film may not be able to follow the structural cracks. It has been pointed out that there are drawbacks such as breakage and water leakage accidents.

Therefore, the present inventors are currently studying various ways to take advantage of the waterproofing method using the synthetic resin emulsion and improve its drawbacks. The present invention was completed based on the discovery that a composition for waterproofing coatings can be obtained by adding a certain proportion of filler and short fibers to form a slurry.

The gist of the present invention is that (g) at least one type of acrylic acid alkyl ester having an alkyl group having 2 to 10 carbon atoms has a molecular weight of 50 or more; (B) a molecular weight of 130 to 1;
500 and having 2 to 4 polymerizable unsaturated groups in one molecule, at least one polyvinyl compound having a weight ratio of 0.1 to 7; (C) at least one α,β-monoethylenically unsaturated carboxylic acid; At least one copolymerizable vinyl monomer of 0.1 to 10% by weight and (D) 49.
1 part by weight of an inorganic powder filler per 100 parts by weight of an aqueous polymer dispersion of copolymerized polymers in a ratio of 8 parts by weight or less
The composition for waterproofing a paint film is composed of 0 to 150 parts by weight of the present invention, and 1 to 50 parts by weight of short mending fibers, and has a viscosity of more than 500 cps.

Specific examples of the polymer copolymer component (5) contained in the waterproof braid of the present invention include an alkyl group such as an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec. -butyl group, t-butyl group, n-amyl group,
Isoamyl group, n-hexyl group, cyclohexyl group, n
-heptyl group, oxoheptyl group, n-octyl group, 2
-ethylhexyl group, n-nonyl group, oxononyl group,
Acrylates such as n-decyl group and oxodecyl group can be mentioned.

The composition of the present invention containing a polymer in which these copolymer components have a weight ratio of 50 or more can form a coating film with good flexibility, adhesion, and elongation, and can be used in cases where structural cracks occur in a structure. It is also possible to obtain a waterproof coating film with excellent crack followability.

Specific examples of the raw material (B) for producing the polymer include polyacrylates of polyols such as ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, glycerin, trimethylolpropane, pentaerythritol, diglycerin,
Di-, tri- or tetra-acrylates or methacrylates made using ditrimethylolpropane, dipentaerythritol, polyethylene glycol with 2 to 23 repeating units, acrylates or methacrylates of polypropylene glycol, polycarboxylic acid di- or triglycidyl esters di-, tri- or tetraglycidyl ethers of polyols, di-, triacrylates or methacrylates of polyglycidyl compounds such as triglycidyl isocyanurate, monosuccinates of unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, hydroxyalkyl acrylates; addition reaction products of monoglycidyl compounds, such as glycidyl acrylate or methacrylate, allyl glycidyl ether, methallyl glycidyl ether, polyisocyanates and hydroxyalkyla. Mention may be made of acrylates or methacrylates, or addition reaction products with allyl alcohol, condensates of methylolated melamine and hydroxyalkyl acrylates or methacrylates, dibylbenzene, methylenebisacrylamide or methacrylamide.

The molecular weight of these compounds is 130 to 1500, preferably 1
The number of polymerizable unsaturated groups contained in one molecule must be in the range of 2 to 4.

The copolymerized amount of these polyvinyl compounds must be in the range of 0.1 to 7 weight units, preferably 0.1 to 5 weight units.

The coating film formed from the composition of the present invention containing a crosslinked polymer copolymerized with these polyvinyl compounds in the above ratio has appropriate elongation and high strength at high temperatures, and has appropriate elongation and high strength at low temperatures. Because it has very specific properties such as moderate strength and excellent elongation, even if a structural crack occurs in the structure, the waterproof surface is extremely unlikely to be destroyed and water leaks are unlikely to occur. It does not cause

On the other hand, if a polyvinyl compound other than those mentioned above is used, or if the copolymerization amount of the polyvinyl compound exceeds the range specified in the present invention, the stability of copolymer production may be impaired, or the obtained polymer may It is difficult for the formed coating film to maintain appropriate strength and elongation, resulting in a decrease in strength and more elongation than necessary at high temperatures, and a marked decrease in elongation and lack of flexibility at low temperatures, leading to breakage. This is not preferable because it tends to occur.

Specific examples of the α,β-monoethylenically unsaturated carboxylic acid that is the raw material (C) for producing the polymer include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, and itaconic acid monoalkyl ester. etc.,
These acid monomers must be copolymerized into the polymer in a proportion of 0.1 to 10% by weight.

These comonomers contribute to improving the dispersion stability of the copolymer used in the present invention in an aqueous medium, and exhibit the effect of improving the affinity of the inorganic filler and short fibers used as reinforcing materials with the aqueous polymer. , which contributes to improving the adhesion of the coating film formed from the composition of the present invention to the structure, but a coating film formed from a copolymer obtained by polymerizing an excessively large amount of this component has poor alkali resistance, water resistance, etc. This is not preferable because the film properties of the film deteriorate.

Specific examples of other copolymerizable vinyl monomers include (
Acrylates other than component a), methacrylates whose alkyl group is a methyl group, ethyl group, proyl group, butyl group, hexyl group, octyl group, decyl group, dodecyl group, stearyl group, lauryl group, benzyl group, cyclohexane group, etc. styrene, acrylic nitrile, methacrylic nitrile, vinyl chloride, vinyl propionate, acrylamide, methacrylamide, hydroxyalkyl acrylate or methacrylate, diacetone acrylamide, N-alkoxyalkylacrylamide, dialkylamine ethyl acrylate, sialkylamine ethyl acrylamide , hydroxyalkyl acrylate or methacrylate, vinyl siloxane, and the like.

When a copolymer is prepared by selecting one of these monomers whose homopolymer has a high glass transition temperature as a copolymerization component, the strength of the copolymer, particularly at high temperatures, can be increased.

Among the above comonomers, those copolymerized with monomers having a functional group at a ratio of 25% or less by weight improve the affinity with inorganic fillers, or improve the film formed by copolymerizing these comonomers. Properties such as adhesion to the base material can be further improved.

The aqueous emulsion polymer dispersion used in the present invention can be prepared by emulsion polymerization of each of the comonomers described above in an aqueous medium containing a combination of emulsifiers in the ranges described above.

As the emulsifier that can be used in the emulsion polymerization method, anionic or nonionic emulsifiers are preferably used.

To prepare the aqueous emulsion polymer dispersion used in the present invention, the emulsion may be used as is or diluted with water as appropriate, but preferably ammonia, water-soluble amine, potassium hydroxide,
From the viewpoint of stability, it is preferable to adjust the pH value to 7 to 10 with sodium hydroxide, etc., but even if it is slightly weakly acidic, as long as it has good stability, it can be used in the present invention. It can be fully utilized for the purpose.

The solids content of the aqueous polymer solution used in the present invention is preferably high, but is usually in the range of 90 to 70%.

Specific examples of the inorganic powder filler used in carrying out the present invention include Kuruk, Myriki, Keisouji, Acid Clay,
carrion, quartz, iron powder, fly ash, ultra white, white carbon, ferrite, lithobon, titanium oxide, pearlite, barite, zinc sulfate, zirconia, wood powder, pozzolan, carbon black, metal oxides such as calcium oxide, magnesium oxide, In addition to zinc oxide, n-lagoon oxide, lead oxide, aluminum oxide, etc., calcium carbonate, magnesium carbonate, barium carbonate, strontium carbonate, magnesium hydroxide, calcium hydroxide, etc. can be mentioned.

These inorganic powder fillers have the effect of preventing cracks in the coating film formed from the composition of the present invention during film formation and preventing sagging of the coating film, as well as improving the toughness of the coating film and improving surface tackiness. It is a component that has the effect of preventing water damage and improves waterproof properties and aesthetic appearance.

These fillers need to be added in a proportion of 10 to 150 parts by weight, and coatings made from compositions with more than 150 parts by weight of these fillers will have poor adhesion to the substrate. However, its elongation and elasticity decrease, and the structure's ability to follow structural cracks decreases, making it impossible to create a coating film with excellent waterproof properties.

Specific examples of short fibers include natural or synthetic fibers in the form of powdered fibers, such as rock wool, pulp, glass wool, slag wool, asbestos, polyvinyl chloride fiber, and polypropylene fiber. , vinylon fiber, nylon fiber, polyester fiber, acrylic fiber, rayon, cotton, hemp, etc. can be used.

It is necessary to add these short fibers in a proportion of 1 to 50 parts by weight, and the coating film formed from a composition containing short fibers in this range improves its strength and exhibits a beautiful pattern finishing effect. However, compositions containing a large amount of short fibers have reduced coating workability, significantly impaired ability to form beautiful patterns, reduced adhesion and flexibility of the coating film, and reduced structural crack followability of structures. The water resistance decreases, making it impossible to form a coating film with excellent waterproof properties.

When adding the above-mentioned inorganic powder filler or short fibers to an aqueous polymer solution, 0.1 to 5 parts by weight of a dispersing agent and
．． It is preferable to use an antifoaming agent in a proportion of 0.1 to 2 parts by weight.

Specific examples of the above-mentioned dispersants include salts of polyacrylic acid, polymethacrylic acid, ligninsulfonic acid, pyrophosphoric acid, tripolyphosphoric acid, hexametaphosphoric acid, other anionic emulsifiers such as partially saponified polyacrylates or polymethacrylates, and nonionic emulsifiers. Examples include emulsifiers,
Specific examples of antifoaming agents include primary alcohols or secondary alcohols having 5 or more carbon atoms, particularly octyl alcohol, caprylic alcohol, and the like, as well as lanolin, diglycol laurate, silicone antifoaming agents, and diethyl phthalate. be able to.

Other additives include organic polymer powder, Bortland cement, alumina cement, blast furnace cement, and white cement.

The composition of the present invention forms a beautifully finished waterproof coating film by applying or spraying it on the roof or wall of a structure, and has good coating workability and prevents sagging and cracking of the coating film. In order to form a beautiful pattern without forming a beautiful pattern, the viscosity of the above composition is 500 cps or more (viscosity measured at 25° C. using a B-type viscometer with rotor No. 1 to 4 at 12 rotations), preferably 1000 to 100,000 cps.
It is necessary that the range is s.

When the viscosity is too low, a sagging phenomenon occurs in the coating film, making it impossible to form a coating film with an aesthetic appearance, and uneven thickness of the coating film also tends to occur, making it difficult to form a uniform coating film.

On the other hand, if the viscosity of this composition is too high, the coating workability and the ability to form beautiful patterns will deteriorate, which is not preferable.

To adjust the viscosity of the composition of the invention, viscosity modifiers such as polyvinyl alcohol, polyacrylamide, polyethylene oxide, sodium alginate, carboxymethyl cellulose, hydroxyethyl cellulose and salts thereof, starch, water-soluble polyacrylic acid or methacrylic acid are used. Examples include salts, and the amount of these viscosity modifiers added is preferably 3 parts by weight or less per 100 parts by weight of the polymer.

In order to further improve the beauty of the coating film formed from the composition of the present invention, dyes and pigments may be added to the composition of the present invention.

The coating film formed from the composition of the present invention has the characteristics of a coating film formed from a waterproofing composition using a non-crosslinked resin emulsion, that is, excellent flexibility, adhesion to the substrate, and resistance to structural cracks. Despite this, there are drawbacks to coatings formed using non-crosslinked resins, such as staining due to the adhesiveness of the coating surface, lack of weather resistance, cracking, etc.
In addition, it has properties that significantly improve the lack of toughness when structural cracks occur.

In order to apply the composition of the present invention to a structure, it is sufficient to apply the composition to a film thickness of up to about 10 nI using a coating method, roller coating method, spray coating method, especially airless spray coating method, etc. Although it may be selected appropriately depending on the purpose, it is usually about 0.5 to 3rI.

The construction surface is mainly made of concrete, mortar, etc., but other materials such as slate, iron, aluminum, fiber, etc.
It can be applied to a variety of materials such as wood, glass, various plastics, and foamed plastics, and can be applied to any form, whether it is a built structure or a plywood-like component. .

The present invention will be explained in more detail with reference to Examples below.

The composition of A-G shown in Example Table-1 was mixed with 100 parts of deionized water,
1.25 parts of sodium dodecylbenzenesulfonate, PO) #
3.75 parts of xyethylene nonyl phenyl ether, 0.54 parts of ammonium sulfite, 0.5 parts of hydrogen persulfate.
After dissolving in a composition consisting of 39 parts and polymerizing at 50° C. for 6 hours, 10% aqueous ammonia was added to neutralize to obtain aqueous polymer emulsions A to G.

The properties of the polymer emulsion were as shown in Table-1.

10 each of aqueous polymer emulsion A-G shown in Table-1
0 parts to 6 parts titanium oxide.

6 parts, 75 parts of calcium carbonate, 1.5 parts of asbestos, 1 part of pulp floc, 1 part of polyoxyethylene nonylphenol ether, 1 part of antifoaming agent, 0.17 parts of thickener, and 14 parts of water, and solid content concentration. is 67.

5 weight section. The results of measuring the viscosity of this slurry are shown in Table 2.

In addition, these compositions were evenly sprayed onto a horizontally placed glass plate to a thickness of about 1 mm, and then left at room temperature for 2 minutes.
After drying for a week, a coating film with a beautiful pattern was formed.

Table 2 shows the results of observing the tackiness of the painted surface.

In addition, the coating film peeled off from the glass plate in the form of a sheet was punched out using a dumbbell No. 3, and this was used as a test piece according to JISK-6300.
Table 2 shows the results of tensile strength and elongation obtained by performing a tensile test in accordance with the ``R Vulcanized Rubber Physical Test Method''.
All of the compositions of the present invention have less tack and 300%
It was recognized that the material has excellent suitability as a coating film waterproofing material because it has the above elongation rate and also has improved strength.

Comparative Examples 1 to 3 As shown in Table 1 below, emulsions K, L, and M were prepared by polymerization in the same manner as in the examples, and various formulations were added to the emulsions, which were coated on a glass plate.

The tackiness of the coating film surface and a check mark test were conducted.

These results are shown in Table 2, and the surface tackiness, tensile strength, and elongation of the coating film were inferior to the composition of the present invention.

Comparative Example 4 As shown in Table 1 below, when the amount of divinyl monomer used increased, a crosslinking reaction occurred during polymerization and the polymer emulsion solidified.

Claims (1)

[Claims] 1 (A) Acrylic acid alkyl ester having an alkyl group having 2 to 10 carbon atoms with a weight coefficient of 50 or more, CB) having a molecular weight of 130 to 1500 and having 2 polymerizable unsaturated groups in one molecule.
0.1-7% by weight of a polyvinyl compound having ~4 (C
)α,β-monoethylenically unsaturated carboxylic acid 0.1-1
100 weight of an aqueous emulsion polymer dispersion containing a copolymer obtained by polymerizing a monomer in which (6) at least one other copolymerizable vinyl monomer is combined in a proportion of 49.8 weight or less. 10 parts of inorganic powder filler
-150 parts by weight and 1 to 50 parts by weight of short fibers are added, and the composition has a viscosity of 500 cps or more.