JPS63132975A - Aqueous coating composition - Google Patents

Abstract

PURPOSE:To provide the titled composition outstanding in thick coating film formability, capable of giving coating film of high water and wear resistances and adhesiveness, comprising an aqueously dispersed polymer prepared by emulsion polymerization in the presence of a specific emulsifying agent (mixture) and an aqueous urethane resin. CONSTITUTION:The objective coating composition comprising (A) an aqueously dispersed polymer prepared by emulsion polymerization of (i) 100pts.wt. of a monomer such as acryl in the presence of (ii) 1-6pts.wt. of an emulsifying agent made up of a) 0.5-5pts.wt. of an anionic emulsifying agent consisting of polyoxyalkylene styrylphenyl ether sulfuric acid salt and/or b) 0-5pts.wt. of a nonionic emulsifying agent consisting of polyoxyalkylene styrylphenyl ether or polyethylene glycol-polypropylene glycol block copolymer and (B) an aqueous urethane resin.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention has excellent thick coating film forming properties, water resistance,
The present invention relates to an aqueous coating composition that can form a coating film with excellent abrasion resistance, adhesion, etc.

(Conventional technology and its limitations) Water-based resins usually include water-soluble resins and water-dispersible resins.
Each has its own characteristics. For example, water-soluble resins include anionic types in which carboxyl groups are neutralized and dissolved with alkali such as ammonia or amines, and cationic types in which tertiary amino groups are neutralized and dissolved in acids. All of these types have excellent film-forming properties, and regardless of the high or low glass transition temperature of the polymer, they will form a film if water-soluble solvents are blown away. A hard polymer coating with excellent black heel mark resistance (such as black heel mark resistance) can be obtained.

However, in the case of water-soluble resins, a large amount of acid or amine is used to impart hydrophilicity, so there is a drawback that durability such as water resistance, alkali resistance, acid resistance, etc. is poor. In addition, if the molecular weight is increased, it is difficult to obtain a product with high concentration and low viscosity, so the molecular weight must be lowered for handling reasons, but low molecular weight is also one of the reasons for poor durability. Ta.

On the other hand, water-dispersible resins obtained by emulsion polymerization in the presence of emulsifiers and protective colloids or mechanically dispersed resins can be obtained at high concentrations and relatively low viscosity, regardless of molecular weight. , uses almost no organic solvents, amines, etc.
Although it has the advantage of having fewer problems such as pollution, it has the disadvantage that the water resistance of the coating film and the adhesion to the substrate are poor due to the effects of the emulsifier, protective colloid, etc. used.

Additionally, water evaporates to dry water-dispersible resins and form a film, but water evaporates more slowly than solvents, so in the case of a thickly coated film, the surface first forms a film, and then the internal parts take a long time to evaporate. Since the film gradually dries, cracks often occur on the film surface during the process.

(Problems to be Solved by the Invention) As a result of various studies in order to roughly improve water-soluble resins and water-dispersible resins that have the above-mentioned advantages and disadvantages, the present inventors have found that When the aqueous dispersion polymer prepared in the above is combined with the aqueous urethane resin, an aqueous coating composition can be obtained that can form a coating film with excellent thick film formation and excellent water resistance, abrasion resistance, adhesion, etc. The present invention was completed based on the discovery that the present invention can be achieved.

[Structure of the invention]

(Means for Solving the Problems) To summarize the present invention, the present invention uses (2) anionic emulsifier of polyoxyalkylene styryl phenyl ether sulfate as an emulsifier system having high surface tension and suitable for emulsion polymerization. 5 to 5 parts by weight, 0 to 5 parts by weight of polyalkylene styrylphenyl ether or polyethylene glycol φ polypropylene glycol block polymer as a υ nonionic emulsifier, 1 to 100 parts by weight of heptamer.
An aqueous dispersion polymer [A] having a glass transition temperature of 0 to 60°C, which is emulsion polymerized by using the anionic emulsifier alone or in combination with the anionic emulsifier and a nonionic emulsifier so that the amount is 6 parts by weight, The present invention relates to an aqueous coating composition comprising a urethane resin (B).

Hereinafter, the configuration of the present invention will be explained in detail.

Examples of the polyoxyalkylene styrylphenyl ether sulfate as (2) anionic emulsifier used in emulsion polymerization in the present invention include Nucol 7073F, Nucol 7233F, and Nucol 7403F (Japanese), which are commercially available as ammonium sulfate salts. Emulsifier n), Hitenol NF-13 (Daiichi Kogyo Seiyaku (I)
Examples of the sodium sulfate salt include Nucol 707 SN (manufactured by Nippon Nyukazai).

In addition, commercially available polyoxyalkylene styryl phenyl ethers as υ nonionic emulsifiers include Nucol 714, Nucol 723 (manufactured by Nippon Nyukazai ■), Emulgen A-60, A-90, A-500 (
, Kao (11 yen li), Neugen EA-137, Neugen EA-177 (manufactured by Daiichi Kogyo Seiyaku n), and the like. Also, as a polyethylene glycol/polypropylene glycol block copolymer, Pluronic L-3
1, L-44, L-61, L-62, L-64, F-6
8, P-84, P-85, F-83 (manufactured by Asahi Denka ■), Epan 410. 420. 450. 485°610,
680. 710. 720. 740. 750.
γ85 (manufactured by Daiichi Kogyo Seiyaku ■), Emulgen PP-1
50, PP-230, PP-250, PP-290 (manufactured by Kao@), and Newport PE-64, PE-68,
PE-74゜PE-75, PE-78, PE-85, P
Examples include E-88 (manufactured by Sanyo Chemical Industries, Ltd.).

In addition to the above-mentioned essential emulsifier components, the emulsifier used in the present invention may also include known reactive emulsifiers such as sodium vinyl sulfonate, sodium styrene sulfonate, alkyl (meth)acrylate sulfonate salts, and alkylaryl sulfosuccinate salts. can be used.

In the present invention, as described above, it is essential to use Q alone or in combination with @0 as an emulsifier during emulsion polymerization, and the reason for this will be explained.

Conventionally, emulsifiers commonly used in emulsion polymerization include anionic emulsifiers such as sodium alkylbenzene sulfonate, sodium lauryl sulfate, polyoxyethylene alkylphenol ether sulfonate, polyoxyethylene alkyl ether sulfonate, and alkyl Diphenyl ether disulfonate and the like are used, and polyoxyethylene alkylphenol ether, polyoxyethylene alkyl ether, polyoxyethylene fatty acid monoester and the like are used as nonionic emulsifiers. However, when a water-dispersible resin composition prepared by using these anionic emulsifiers alone or in combination with these anionic emulsifiers and nonionic emulsifiers is applied thickly to concrete, mortar, etc., only the surface dries, and the coating film surface Cracks occur. On the other hand, when the above-mentioned specific emulsifier of the present invention is used, the entire thick coating film dries uniformly, and a coating film without surface cracks can be obtained.

However, control of the amount of emulsifier used is extremely important, and in emulsion polymerization (per 100 parts of monomer,
The emulsifier is controlled at 1-6@m parts.

If the emulsifier used ω is less than the above range, gels and blocks will occur during emulsion polymerization, making it impossible to obtain the desired emulsion, while if it is too large, the water whitening resistance will decrease and problems with physical properties will occur. It's inappropriate.

In the present invention, the most preferable properties of the polymer prepared by emulsion polymerization using the emulsifier are that the glass transition temperature (Tg) of the polymer is 0 to 60°C, and that the TO is low.
If it is too thick, the strength of the coating film will be low and problems with physical properties such as water whitening resistance will occur, which is not preferable.

On the other hand, if it becomes too high, the coating film becomes brittle or defective in film formation, which is not preferable.

There are no particular limitations on the monomer composition applied to emulsion polymerization. However, from the viewpoint of the use of the aqueous coating composition of the present invention, for example, when applying it to a concrete floor surface, it is preferable to use a coating composition which has an alkaline concrete floor surface but which has an unnecessarily large number of functional groups such as an acid component, or a vinyl ester coating composition. Among these, vinyl acetate copolymers have poor alkali resistance, so such a seven-mer composition is not preferred. Furthermore, among the vinyl halide compounds, vinyl chloride or vinyllindene chloride copolymers have poor weather resistance, so care must be taken.

From this point of view, acrylic nail polishers are particularly preferred. The acrylic nail polish used in the present invention has a raw monomer composition of (meth)acrylic acid-based unsaturated monomers, such as ethyl acrylate, butyl acrylate, 1So-butyl acrylate, and acrylic acid. 2-ethylhexyl, isononyl acrylate, lauryl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, methacrylic 1lis.

Examples include alkyl esters of (meth)acrylic acid having 2 to 12 carbon atoms, such as -butyl, t-butyl methacrylate, 2-ethylhexyl methacrylate, and lauryl methacrylate.

In the present invention, the following copolymerizable monomers can be used in combination with the acrylic nail polisher.

・Aromatic vinyl compounds such as styrene and vinyltoluene.

- Nitrogen-containing vinyl compounds such as acrylonitrile and N-vinylpyrrolidone.

- Unsaturated basic acids such as acrylic acid, methacrylic acid, and crotonic acid, and their salts.

- Unsaturated dibasic acids such as itaconic acid, maleic acid, and fumaric acid, and their half esters and salts.

・Acrylamide, N-methylolacrylamide,
Amides of unsaturated carboxylic acids or derivatives thereof, such as methacrylamide.

- Vinyl esters such as vinyl propionate and vinyl persatate.

- Glycidyl esters of unsaturated acids such as glycidyl acrylate and glycidyl methacrylate.

- Unsaturated sulfonic acids and their salts, such as vinylsulfonic acid, methacrylsulfonic acid, 2-sulfoethyl methacrylate, styrenesulfonic acid, allylsulfonic acid, and alkylarylsulfosuccinic acid.

- Vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(β-methoxyethoxy)silane, γ-methacryloxypropyltrimethoxysilane, etc. as internal crosslinking agents contain polymerizable double bonds and alkoxysilane groups in their molecules. monomer.

- Polyvalent vinyl compounds (divinyl compounds, dimethacrylate, compounds, trimethacrylate compounds), polyvalent allyl compounds (diallyl compounds, triallyl compounds), etc.

These may be used alone or as a mixture of two or more.

The acrylic polymer that essentially includes the acrylic yarn can be easily produced by a known emulsion polymerization method. That is,
The above-mentioned anionic emulsifier alone (0) or a combination system of anionic emulsifier and nonionic emulsifier (a to b
), the aqueous dispersion polymer (A) can be easily produced by high-temperature reaction using a thermal decomposition catalyst or low-temperature reaction using a redox catalyst.
can be manufactured.

The water-based polyurethane resin (B) used in the present invention is
A polyurethane resin in which a polyurethane prepolymer consisting of a polyol such as a polyester polyol or a polyether polyol and an aromatic, aliphatic, or alicyclic diisocyanate is chain-extended with a low molecular weight compound having two or more active hydrogens such as a diol or diamine. Stably dispersed or dissolved in water. The following methods are known as methods for dispersing or dissolving.

■ Forcibly disperse the reacted polymer or the polymer whose terminal isocyanate groups are blocked with a blocking agent (oxime, alcohol, phenol, mercaptan, amine, sodium bisulfite, etc.) in water using an emulsifier and mechanical shearing force. Method.

Furthermore, a method in which a urethane prepolymer with terminal isocyanate groups is mixed with water, an emulsifier, and a chain extender, and mechanical shearing force is used to simultaneously disperse and increase the molecular weight.

(2) A method in which hydrophilicity is imparted by introducing ionic groups such as hydroxyl groups, amino groups, and carboxyl groups to the side chains or terminals of polyurethane polymers, and the polymers are dispersed or dissolved in water by self-emulsification.

■ A method in which a water-soluble polyol such as polyethylene glycol is used as a polyol as the main raw material for polyurethane, and the polyurethane resin is dispersed or dissolved in water.

The aqueous polyurethane resin CB) used in the present invention is not limited to a single dispersion or dissolution method as described above, but a mixture obtained by each method can also be used. Among these, nonionic water-dispersed or anionic water-based polyurethane resins are preferred in terms of mixing stability and water resistance. For example, commercially available products include the ``Bondic'' series and the ``Hytran'' series (manufactured by Dainippon Ink & Chemicals vlj).
, "Inplanil" series (manufactured by Bayer AG), "Sofranate" series (manufactured by Nippon Soflan Kako), "Poise" series (manufactured by Hanadama), "Neoret" series (manufactured by Polyvinyl Chemical), "Sunburenco series" (manufactured by Sanyo Chemical Industries, Ltd.), "Rethermin" series (manufactured by Dainichi Seikagaku, Ltd.), "Izerax" series (manufactured by Hodogaya Chemical Industries, Ltd.), and "Super Flexco series (manufactured by Daiichi Kogyo Seiyaku, Ltd.), etc. be able to.

The solid content weight ratio of the aqueous dispersion polymer (A) and the aqueous urethane resin CB) is preferably in the range of 95:5 to 5:95, and if the ratio [A] exceeds 95, the wear resistance of the urethane resin will deteriorate. Sexual characteristics are not expressed. Furthermore, if the ratio of (B) exceeds 95, the durability characteristics of [A] will not be exhibited.

The aqueous coating composition of the present invention prepared as described above can be applied to an object by an appropriate coating method such as coating, roll coating, or spraying. At that time, pigments normally used in paints (white pigments such as titanium dioxide, calcium carbonate, barium carbonate, and kaolin, colored pigments such as red rosewood, carbon, and cyanine blue), sand, agar stone, porcelain powder, etc. fine aggregate, plasticizer, solvent, dispersant,
Additives such as thickeners, antifoaming agents, preservatives, etc. that are commonly used as paint compositions may be used in combination.

(Example) Hereinafter, it will be specifically explained using examples or comparative examples.
The present invention is not limited only to these examples.

Note that all parts and percentages are based on weight unless otherwise specified.

Example 1 Below margin ω Polymerization polymers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic acid
2 parts Divinylbenzene 0.5 parts ■ Surfactant ■ Ion-exchanged water 148 parts) Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogen sulfite 0.2 parts Surfactant in a four-loaf flask,
and ion-exchanged water, the temperature was raised to 60°C in a nitrogen stream, and then (in Step 1, polymerization initiators were added, and a mixture of polymerizable heptamers was added dropwise over a period of 3 hours. The reaction temperature was adjusted to a range of 60 to 70°C.

After the completion of the dropwise addition, the reaction is continued under stirring while maintaining the same temperature range for 2 hours, then cooled and adjusted to pH 8-9 with 14% ammonia water to achieve a stable solid content of 40%. An aqueous dispersion polymer was obtained. To 200 parts of the aqueous dispersion polymer obtained above, add water-based urethane resin “Hytran HW” to 200 parts of the aqueous dispersion polymer obtained above.
-45 parts of -311J (solid content: 45%) were added to prepare an aqueous coating composition.

Example 2 ■ Polymerization additives n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic'v 2 parts Divinylbenzene 0.5 parts ■ Surfactants Nucor 7078F (solid content = 30%) 5 parts Emulgen A-90 (solid content = 100%) 2 parts ion-exchanged water 152 parts Polymerization initiators Ammonium persulfate 0.5 parts Sodium 6A hydrogenite 0.2 parts Same as Example 1 with the above formulation The desired stable aqueous dispersion polymer with a solids content of 4% was prepared (wat).

To 200 parts of this aqueous dispersion polymer, 60 parts of an aqueous urethane resin [Neoretz R-960J (solid content - 33%) was added to prepare an aqueous coating composition.

Example 3 ■ Polymerization polymers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic M
2 parts divinylbenzene 0.5 parts ■ Surfactants Nucor 7073F (solid content = 30%) 5 parts Emulgen A-90 (solid content = 100%) 1 part Pronic [-68 (solid content = 100 %) 3 parts ■ Ion-exchanged water 155 parts) Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogen sulfite 0.2 parts Stable purpose with solid content of 40% in the same manner as in Example 1 with the above formulation An aqueous dispersion polymer was obtained.

5 parts of water-based urethane resin [BONDIC 1660J (solid content = 40%)] was added to 200 parts of this water-based dispersion polymer.
0 parts were added to prepare an aqueous coating composition.

Example 4 (1) Polymerization monomers 2 Ethylhexyl acrylate 35 parts Methyl methacrylate 62.5 parts Methacrylic acid 2 parts Divinylbenzene 0.5 parts ■ Surfactant Nucor 707SF (solid content = 30%) io Part ■ Ion exchange water 148 parts (to)
Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogen sulfite 0.2 parts The desired stable aqueous dispersion polymer having a solid content of 40% was obtained in the same manner as in Example 1 using the above formulation.

To 200 parts of this water-based dispersion polymer, add 6 parts of water-based urethane resin [Neorets R-960J (solid content = 33%)].
0 parts were added to prepare an aqueous coating composition.

Example 5 ■ Polymerization monomers n-butyl acrylate 40 parts Methyl methacrylate 32.5 parts Styrene
30 parts methacrylic acid
2 parts divinylbenzene 0.5 parts ■ Surfactants Nucor 707SF (solids content = 30%) 5 parts Emulgen A-90 (solids content = 100%) 1 part Pluronic F-68 (solids content = ioo %) 3 parts Ion-exchanged water 155 parts Negative) Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogenite 0.2 parts Stable solid content of 40% in the same manner as in Example 1 with the above formulation A desired aqueous dispersion polymer was obtained.

For 200 parts of this aqueous dispersion polymer, aqueous urethane resin "Vitorant IW-311J (solid content = 45%)"
45 parts of the above were added to prepare an aqueous coating composition.

Comparative Example 1 ■ Polymerization polymers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic acid
2 parts Divinylbenzene 0.5 parts ■ Surfactants Nucor 7073F (solid content = 30%) 1 part Emulgen A-90 (solid content = 100%) 0.6 parts (3) Ion exchange water 151 parts )
Polymerization initiators Ammonium persulfate O, S parts Sodium hydrogen sulfite 0.2 parts Emulsion polymerization was carried out in the same manner as in Example 1 using the above formulation, but the resulting aqueous dispersion polymer contained many aggregates and was not suitable for practical use. It was unsuitable for

Comparative Example 2 (1) Polymerization polymers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic acid
2 parts Divinylbenzene 0.5 parts ■ Surfactant Nucor 7073F (solid content = 30%) 21 parts ■ Ion-exchanged water 145 parts G) Polymerization initiators Ammonium persulfate 0.5 parts Sodium bisulfite 062 parts Above formulation A stable aqueous dispersion polymer having a solid content of 40% was obtained in the same manner as in Example 1.

To 200 parts of this aqueous dispersion m-combination, water-based urethane resin [Hytran 1-IW-311J (solid content = 45%
) was added to prepare an aqueous coating composition.

Comparative Example 3 ■ Polymerization polymers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic M
2 parts Divinylbenzene Part O, S ■ Surfactant Nucor 7075F (solid content = 30%) 10 parts (3) Ion exchange water 148 parts G)
Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogen sulfite 0.2 parts A stable aqueous dispersion polymer having a solid content of 40% was obtained in the same manner as in Example 1 using the above formulation.

To 243 parts of this aqueous dispersion polymer, 7 parts of an aqueous urethane resin "Hytran HW-311J (solid content = 45%) was added to prepare an aqueous coating composition.

Comparative Example 4 ω Polymerization additives n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic acid
2 parts Divinylbenpine 0.5 parts ■ Surfactant Nucor 7078F (solid content = 30%) 10 parts ■ Ion exchange water 148 parts @) Polymerization initiators Ammonium persulfate 0.5 parts Sodium bisulfite 0.2 1 q of a stable aqueous dispersion polymer having a solids content of 40% was prepared in the same manner as in Example 1 using the above formulation. To 7.5 parts of this water-based dispersion polymer, 29 parts of water-based urethane resin "Neorets R-96DJ (solid content = 33%)" was added.
4 parts were added to prepare an aqueous coating composition.

Comparative Example 5 Below margin ■ Polymerized acid monomers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic acid 2 parts Divinylbenzene 0.5 part ■ Surfactant (*) Neogen R (solid content = 60%) 5 153 parts of ion-exchanged water) Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogen sulfite 0.2 parts (*) Neogen R: Sodium alkylbenpine sulfonate manufactured by Dai-Kogyo Seiyaku ■ Conducted with the above formulation A stable aqueous dispersion polymer having a solid content of 40% was obtained in the same manner as in Example 1. This aqueous dispersion polymer 20
0 parts, water-based urethane resin "Hytran HW-31"
An aqueous coating composition was prepared by adding 45 parts of No. 14 (solids content = 45%).

Comparative Example 6 ω Polymerization polymers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic acid
2 parts Divinylbenzene 0.5 parts ■ Surfactants (*) Hitenol N-08 (solid content = ioo%) 2 parts Neogun R (solid content = 60%) 5 parts ■ Ion exchange water 156 parts ( fart)
Polymerization initiators ammonium persulfate o, s part iii! tM
Sodium hydrogen 0.2 parts (*) Hitenol N
-08: Polyoxyethylene alkylphenol ether manufactured by Daiichi Kogyo Seiyaku @ A stable aqueous dispersion polymer having a solid content of 40% was obtained in the same manner as in Example 1 using the above formulation. This aqueous dispersion type coalescence 20
0 parts, water-based urethane resin [Bondic 1660
An aqueous coating composition was prepared by adding 50 parts of J (solids content = 40%).

Comparative Example 7 0) Polymerization acid monomers n-butyl acrylate 40 parts Methyl methacrylate 57.5 parts Methacrylic acid
2 parts divinylbenzene 0.5 parts ■ Surfactants Nucor 7073F (solid content = 30%) 10 parts Emulgen A-90 (solid content = ioo%) 2 parts Pluronic F-68 (solid content = 100 %) 3 parts Ion-exchanged water ISO part) Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogen sulfite 0.2 parts A stable aqueous solution with a solid content of 40% was prepared in the same manner as in Example 1 using the above formulation. A dispersed polymer was obtained.

To 200 parts of this aqueous dispersion polymer, 45 parts of an aqueous urethane resin "Hytran HW-311J (solid content = 45%) was added to prepare an aqueous coating composition.

Comparative Example 8 (1) Polymerization acid monomers 2 Ethylhexyl acrylate 70 parts Methyl methacrylate 27.5 parts Methacrylic acid 2 parts Divinylbenzene 0.5 parts ■ Surfactant Nucor 7073F (solid content = 30%) 10 parts ■ Polymerization initiators (148 parts of ion-exchanged water) 0.5 parts of ammonium peroxide Polymer (
Tg=-13℃) is 1q. This aqueous dispersion polymer 200
part, water-based urethane resin [Hytran HW-311
45 parts of J (solids content = 45%) were added to prepare an aqueous coating composition.

Comparative Example 9 α) Polymerized acid monomers n-butyl acrylate 15 parts Methyl methacrylate 82.5 parts Methacrylic acid
2 parts Divinylbenzene 0.5 parts ■ Surfactant Nucor 7073F (solid content = 30%) io parts ■ Ion-exchanged water 148 parts) Polymerization initiators Ammonium persulfate 0.5 parts Sodium hydrogen sulfite 0.2 parts A stable aqueous dispersion polymer with a solids content of 40% (To=
71°C). For 200 parts of this aqueous dispersion polymer,
45 parts of an aqueous urethane resin "Hytran HW-311J (solid content = 45%) was added to prepare an aqueous coating composition.

Examples 1 to 5 prepared as above and Comparative Example 1
The aqueous coating compositions No. 9 to 9 were mixed into paints as shown below, and each was evaluated for thick film formation, water resistance, alkali resistance, abrasion resistance, and staining resistance.

The results are summarized in Table 1.

Paint formulation examples> Examples and comparative examples Aqueous coating composition 1,000 parts Jisozizer C8-12 (manufactured by Chisso Corporation) 70 parts Ethylene glycol 25 parts Adekanol Ul-1-420 (5% aqueous solution) (manufactured by Asahi Denka Corporation) Part 3 Nopco 803
4L (manufactured by San Nopco) 2 parts Kansuiseki (1 liter)
1,000 copies Kansuiseki (3 rin)
1,000 copies Kansuiseki (5 rin)
SOO part total 3,
600 copies The evaluation method is as follows.

ω Thick film forming property: Spread the above coating composition evenly onto a flexible board with a metal trowel.
It was coated to a thickness of mm and dried outdoors, and the degree of crack formation in the coated film was visually observed for 12 days.

At that time, the outside temperature was 32°C, the humidity was 85%, and there was a slight breeze.

(2) Water resistance After immersing the specimens prepared under the above conditions (drying time: 48 hours) in water for 7 days, changes such as softening and blistering of the coating film were observed.

(2) Alkali resistance Water resistance After immersing a specimen prepared in the same manner as in the case of water resistance in a Ca (OH) 2 saturated aqueous solution for 7 days, changes such as softening and pristalling of the coating film were observed.

2) Abrasion resistance, ■ Stain resistance, test specimens (60 x 60 cm) prepared under the above conditions were pasted on the road, and the wear of the paint film due to foot traffic and the degree of contamination due to heels, etc. were determined over a period of 3 months. Observed.

0 Adhesion force The coating composition was applied onto a J136910 mortar sample for adhesion measurement to a thickness of 2 mm using a metal trowel, and after drying indoors for 7 days, measurements were made according to the JIS 6910 adhesion test.

(Effects of the Invention) The aqueous coating composition of the present invention has excellent ability to form a thick film when dried at room temperature, as well as water resistance, abrasion resistance,
A coating film with excellent adhesion can be formed.

Claims (1)

[Claims] 1. 0.5 to 5 parts of polyoxyalkylene styryl phenyl ether sulfate as anionic emulsifier, 0 to 5 parts of polyoxyalkylene styryl phenyl ether or polyethylene glycol/polypropylene glycol block copolymer as nonionic emulsifier. An aqueous dispersion polymer [A] obtained by emulsion polymerization in which the anionic emulsifier alone or the anionic emulsifier and the nonionic emulsifier are present in an amount of 1 to 6 parts by weight per 100 parts by weight of the monomer. , an aqueous urethane resin [B]. 2. The glass transition temperature of the aqueous dispersion polymer [A] is 0 to 60
An aqueous coating composition as claimed in claim 1 in which the temperature is within the range of 0.degree. 3. The aqueous coating composition according to claim 1 or 2, wherein the aqueous dispersion polymer [A] is an acrylic aqueous dispersion polymer.