JPH0122214B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an aqueous basecoat composition comprising an improved cement or mortar additive synthetic resin emulsion added to a cement or mortar mixture. In order to improve the adhesion and anti-corrosion effect of polymer cement, the present inventors have incorporated the resin solid content into synthetic resin emulsions for polymer cement.
The present invention has been filed for a synthetic resin composition for adding to cement, which is made by mixing 0.05 to 5 parts by weight of amino alcohol per 100 parts by weight. (Special application 1978-161578
Furthermore, as a result of various studies, we found that when used as a water-based undercoat, it improves the rust prevention and waterproofing effects on metal substrate surfaces and mineral structure surfaces, as well as improves coating film performance such as compressive strength, bending strength, and adhesion. improved,
The present invention was completed by discovering that the adhesion with the top coat paint was improved. The present invention provides a synthetic resin emulsion in which 5 to 60 parts by weight of an amino alcohol, particularly an amino derivative of propyl alcohol is added to 100 parts by weight of cement, in an amount of 0.05 to 5 parts by weight per 100 parts by weight of the resin solid content. This is an aqueous undercoat paint composition comprising: In the present invention, the synthetic resin emulsion refers to acrylic synthetic resin emulsion for polymer cement, vinyl acetate synthetic resin emulsion, styrene-butadiene latex, acrylonitrile-butadiene latex, epoxy resin emulsion, and the like. In particular, alkyl esters of acrylic acid or methacrylic acid in which the alkyl group has 1 to 8 carbon atoms, or copolymers thereof, vinyl acetate and its polymers, ethylene-vinyl acetate copolymers, vinyl acetate-vinyl acetate-vinyl acetate Emulsions such as ester copolymers, vinyl propionate-vinyl acetate copolymers, and the like are preferred. Further, as the epoxy resin emulsion, one in which a condensation of bisphenol A and epichlorohydrin is uniformly dispersed in water can be used. Further, as the epoxy resin curing agent, general epoxy resin curing agents such as polyamide and amine adduct can be used. As the amino alcohol in the present invention, amino compounds such as ethanol, propanol, butanol, pentanol, hexanol, heptanol, octanol, or isomers thereof, each having 2 to 8 carbon atoms, are effective. Derivatives, such as amino alcohols such as 1-amino-2-propanol, 3-amino-1-propanol, 2-amino-2-methyl-1-propanol, 2-amino-1-propanol, have waterproof, adhesive and It is preferable because it has a large rust prevention effect. The reason for limiting the amount of amino alcohol to 0.05 to 5 parts by weight per 100 parts by weight of the resin solid content of the synthetic resin emulsion is that if it is less than 0.05 parts by weight, the intended effects such as rust prevention and waterproofing of cement and mortar will not be achieved. The reason why the amount is not more than 5 parts by weight is due to economic reasons, and preferably 0.2 to 1.5 parts by weight is used. Further, if necessary, one type or a combination of two or more types can be used. In addition, in the present invention, cement refers to various types of Portland cement, alumina cement, white cement, etc., and depending on the purpose, the synthetic resin composition of the present invention is in the range of 5 parts by weight to 60 parts by weight based on 100 parts by weight of cement. The amount is preferably 10 to 40 parts by weight. Aggregates added as necessary for the present invention include conventional materials such as silica powder, silica sand, talc, mica, acid clay, diatomaceous earth, kaolin, sand, colored sand, calcium carbonate (kansuite), organic and inorganic fibers, etc. aggregate for plastering, etc. If necessary, coloring pigments such as titanium oxide, carbon black, and red iron oxide, water-soluble polymer thickeners such as methyl cellulose, antifoaming agents, preservatives, etc. are added. Usually, a mixture of synthetic resin emulsion, amino alcohol, film-forming aids, antifoaming agents, and other trace additives is prepared, and when used, it is added to powdered material mixed with cement and various aggregates in a mixing machine. Mix and add water to obtain the required viscosity. The coating method is generally known such as spraying, painting, roller coating, brush coating, troweling, etc., and the coating is applied in an appropriate amount depending on the purpose. In the case of spray painting, the film thickness is preferably at least 400 microns or more, depending on the particle size and content of the aggregate, so that the paint film does not sag after one spraying. The curing period according to standard specifications is
Compressive strength is 122.4Kg/cm ² at 35℃ for 7 days.
Also after 7 days water curing at 20℃ and 80% relative humidity.
222Kg/cm ² under daily conditions, bending strength 81.3
Kg/cm ² and the standard values set in “JASS23”
This was greatly improved compared to 110Kg/cm ² and 35Kg/cm ² and at the same time showed excellent water permeability. As described above, the undercoat paint of the present invention can be applied to the surfaces of concrete boards, concrete blocks, or walls, mineral structures such as mortar walls, slate boards, and stones, the surfaces of wooden boards or structures such as plywood boards, hardboard boards, or It can be applied to the surface of metal structures such as iron plates to form a coating film with excellent rust prevention, waterproofness, and adhesion.At the same time, it has excellent adhesion with top coats and has impact resistance, bending resistance, and resistance. Because the physical properties of the paint film, such as cracking resistance, compressive strength, and bending strength, are improved, it has the effect of producing a superior topcoat surface compared to the case where a topcoat is applied to the conventionally commonly used cement-based basecoat material. Examples of top coatings include vinyl enamel paints such as vinyl chloride enamel paints and acrylic enamel paints, epoxy enamel paints, synthetic rubber latexes such as natural rubber and styrene-butadiene copolymer synthetic rubber, polyvinyl acetate, polyvinyl chloride, and acrylic resins. various synthetic resin emulsion paints consisting of synthetic resin emulsions, extender pigments, and coloring pigments, reaction-curable synthetic resin emulsion paints such as epoxy resins, mineral materials such as inorganic paints with binders such as sodium silicate or silica sol, etc. Top coats commonly used for the interior and exterior surfaces of structures, the interior and exterior surfaces of metal structures, and the surfaces of wooden structures can be used. These top coats can be applied by brush, roller,
Smooth surfaces,
Various finished surfaces such as sand walls, uneven patterns, and multilayer patterns can be formed. The painting method for polished mild steel plates is to remove rust adhering to the metal surface, deteriorated old paint film, etc. by sanding,
Carefully remove it using a wire brush, file, etc. using a conventional method, remove oil, fat, dust, etc. with thinner, etc., and then paint.As a standard, add 0.6% fresh water to the formulation shown in Example 1 (3) Painting test. ~0.8 part by weight is mixed and applied twice at a spraying pressure of 4 to 5 kg/cm ² with a coating amount of about 700 g/cm ² using a 5 mm diameter Juyuraku gun. In this case, it hardens to the touch in 1 hour at 20°C, 65% RH, and fully hardens in 24 hours. In addition, the decorative finish using alkali-resistant paint can be applied after drying for about 24 hours, which has the effect of shortening the painting time compared to conventional undercoating. Therefore, ship decks, holds, ballast tanks, various underwater, offshore and coastal structures, cranes, steel towers, tanks, bridges,
Effective as a heavy-duty anti-corrosion coating for metal parts of power transmission towers, railway vehicles, road vehicles, etc., iron pipes, steel pipes, guardrails, road surface steel plates, sewage steel plates, steel plates, temporary pipes, elevators, steel sashes, and other ferrous metal structures. . Therefore, it can be used as an "anti-slip" paint by applying it to uneven surfaces such as ship decks and road iron plates. In addition, because of its high water permeability resistance, it is suitable for painting metal and mineral structures such as underground structures, tunnels, and sewers, and for painting exterior structures such as cement and mortar, making it more waterproof and durable than conventional paints. It has effects such as superior sex. This will be explained in detail below using examples. Example 1 (1) Production method of synthetic resin emulsion for cement addition. "Boncourt 4500" (Dainippon Ink Co., Ltd., trade name) with a resin solid content of 45% as an acrylic ester synthetic resin emulsion 82.0 parts by weight, 2
% "Nantrozole 250HR" (cellulose derivative, trade name of Hercules Co., Ltd.) 13.7 parts by weight, 0.8 parts by weight of 2-amino-2-methyl-1-propanol (90% concentration), 1.5 parts by weight of fatty acid ester type defoaming agent Parts by weight, "Bentside F" (Dainippon Ink Co., Ltd. product name) as a disinfectant
0.4 parts by weight and 1.6 parts by weight of "CS-12" (trade name of Chitsuso Corporation) as a film-forming aid were mixed uniformly. (2) Manufacturing method of cement mixture Portland cement 30 parts by weight Silica powder #100 (particle size average 50 mesh) 12〃 Silica powder #200 (particle size average 270 mesh) 11.5〃 Microdol 12〃 Polyethylene fiber (dimensional length 0.7 mm) 0.35〃 Melment F-10 (Showa Denko Company product name)
0.15〃 Silica sand No. 7 (average particle size 150 mesh) 17.00〃〃〃〃 No. 8 (average particle size 200 mesh) 17.00〃 Total 100 parts by weight The powders having the above composition were uniformly mixed. (3) Painting test Add water to a mixture of 1 part by weight of the ``synthetic resin composition for adding cement'' in (1) and 4 parts by weight of the ``cement mixture'' in (2), and mix. An undercoat paint of the present invention having a moisture content of approximately 80% was prepared. Separately, as a target product, an undercoat paint with the same composition as above except that 2-amino-2-methyl-1-propanol was not added was prepared, and each uncoated paint was
Two types of coated test plates were prepared using a spray gun on the surface of a polished mild steel plate with dimensions of 0.6 mm, 15 cm in height, and 7.5 cm in width using a spray gun so that the coating amount was 1.6 Kg/m ² . 35℃,
Dry film thickness after 7 days and 20℃ after 7 days water curing,
The compressive strength when cured at 80% relative humidity was as follows, and the product of the present invention showed superior results compared to the target product.

【table】

[Table] According to the JIS A1404 test method for cement waterproofing agent for construction, 1-
The undercoat of the present invention used in the coating test of Example 1 and the target undercoat of Example 1 (2-amino −
The same composition as above except that 2-methyl-1-propanol was not added) was applied at various coating weights.35
Several types of undercoated test plates were prepared after being cured at ℃ for 7 days. Rubber packing with a thickness of 1 cm and having a water-permeable circular hole with a diameter of 5 cm was attached to the center of both the upper and lower surfaces of this test plate, and tests were conducted on the painted and unpainted surfaces under the following conditions. A test panel coated with the target undercoating paint of Example 1 and a test panel not coated at all were tested, and the present invention showed excellent water permeation resistance.

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[Table] Next, in addition to the above-mentioned Example 1, other Examples 2 to 24 of the present invention are listed together in Tables 4 to 7 along with comparative examples. Table 4: Examples 2 to 7 Examples 2 to 7 Example 1 in which the amount of 2-amino-2-methyl-1-propanol added was changed. Table 5: Examples 8 to 13 Different types of amino derivatives of propanol. Table 6: Examples 14 to 18 P/C was changed. Table 7: Examples 19 to 24 Different emulsion types.

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Claims (1)

[Claims] 1 100 parts by weight of cement, 5 to 60 parts by weight of a synthetic resin emulsion made by adding 0.05 to 5 parts by weight of an amino derivative of propyl alcohol per 100 parts by weight of the resin solid content, and aggregate if necessary. A water-based undercoat paint composition.