JPH0319871B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a paint for slates such as ceilings and stone slabs. Paints for slate are required to be especially durable among residential building materials. Recently, two-component acrylic urethane resin-based paints have appeared and are gradually becoming widely adopted in combination with electrostatic coating methods. However, slate and stone slabs (1) have a much higher moisture content than general coating base materials such as metals and plastics; (2) The surface is extremely porous. (3) Must be strongly alkaline. Slate has the above three properties, and these properties reduce the workability of painting and the properties of the painted film compared to general paints, including acrylic urethane resin paints. That is, the acrylic urethane resin paint uses a mixture of acrylic polyol as the main ingredient and a crosslinking agent mainly composed of isocyanate, but this isocyanate easily reacts with water to generate carbon dioxide gas. There is a property that
The slate reacts with the moisture contained in the slate to generate carbon dioxide gas, creating bubbles in the painted film, and the porous surface also causes numerous holes to form in the film. Therefore, although the two-component acrylic urethane resin paint is relatively durable, when it is used for slate, it is necessary to precisely adjust the slate surface. That is, in line painting, such adjustment steps can be provided and carried out under strict process control, but in on-site painting, such substrate adjustment is almost impossible. As a result of intensive research, the present inventors found that the main chain is substantially composed of polyvinyl-type bonds and has at least one silyl group in one molecule that has a silicon atom with a hydrolyzable group bonded to the molecular end or side chain. It has been found that a paint based on a polymer or copolymer (A) does not require preparation of the substrate, and does not generate gas, form bubbles, or form holes.
In addition, the slate coated object coated with the paint has excellent durability and weather resistance compared to the two-component acrylic urethane resin paint, leading to the present invention. The resin used in the present invention has a main chain substantially composed of a vinyl polymer, and has at least one, preferably two or more, silicon groups bonded to a hydrolyzable group at the terminal or side chain in each molecule. It contains
Most of the silyl groups are

It is shown by [Formula]. (However, X is a hydrolyzable group, (R ₁ ),
(R ₂ ) represents hydrogen or an alkyl group, aryl group, or aralkyl group having 1 to 10 carbon atoms, and n is an integer of 1, 2, or 3) Hydrolyzable groups include halogen, alkoxy, acyloxy, Includes ketoximate, amino, acid amide, aminooxy, mercapto, and alkenyloxy groups. The production of the silyl group-containing vinyl resin of the present invention includes:
It is possible in various ways, but as shown below, ○

Claims (1)

[Scope of Claims] 1. A polymer whose main chain is substantially composed of polyvinyl-type bonds and which has at least one silyl group in each molecule that has a silicon atom bonded to a hydrolyzable group at the molecular end or side chain. Or slate paint based on copolymer (A). 2 Based on 100 parts by weight of the polymer or copolymer (A), the curing catalyst (B) comprises 0.01 to 20 parts by weight, and the solvent (C) comprises 0 to 400 parts by weight. paint. 3 The molecular weight of the polymer or copolymer is 2000 to 10000
The coating material according to claim 1, which falls within the scope of claim 1. 4. The coating material according to claim 1, wherein the copolymer having a silyl group whose main chain consists essentially of polyvinyl type bonds is a copolymer containing maleic anhydride as a copolymerization component. 5. The paint according to claim 1, wherein the copolymer having a silyl group whose main chain consists essentially of polyvinyl type bonds contains acrylamide as a copolymer component. 6. The paint according to claim 1, wherein the hydrolyzable group is an alkoxy group. 7. The coating material according to claim 2, wherein the curing catalyst (B) is a carboxylic acid type organotin compound. 8. The paint according to claim 2, wherein the curing catalyst (B) is a mercaptide-type organotin compound having an Sn--S bond. 9. The coating material according to claim 2, wherein the curing catalyst is a sulfide type organotin compound having a Sn=S bond. 10. The paint according to claim 2, wherein the solvent (C) is a solvent containing methyl orthoformate. 11. The paint according to claim 2, wherein the solvent (C) is a solvent containing an alkyl alcohol. 12. The paint according to claim 2, wherein the solvent (C) is a solvent containing ethyl silicate.