JPH0625324B2 - Paint composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coating composition for protecting the surface of a foam concrete plate or the like and the surface of a cut surface or the like.

[Conventional technology]

Surfaces and cut surfaces of foam concrete plates and cement blocks are themselves porous and have no water resistance. Further, it has a drawback that the mechanical strength is small.

In particular, the state of bubbles on the surface is brittle, and water easily penetrates, so that the strength is likely to decrease.

As described above, the surface of the foamed concrete plate or the like is brittle and easily deteriorates in strength, so that the surface must be protected.

First, as the surface protection, a base treatment is performed. When the base treatment is finished, a makeup finish is performed after a predetermined curing time.

As the base treatment, a method of applying a synthetic resin emulsion having excellent alkali resistance represented by an acrylic resin emulsion or applying a cement filler is generally performed.

Each company has a certain level of cement filler and can be used with confidence. The cement filler is subjected to smoothing at the same time as strengthening the brittle layer on the surface of the foam concrete plate or the like.

Next, synthetic resin emulsion-based lysine such as acrylic lysine is usually mainly used as a cosmetic finish on the surface. However, it is difficult to finish uniformly with only synthetic resin emulsion lysine, and the coated surface has many irregularities.

In general, in order to protect the surface of a foam concrete plate, etc., (1) it is necessary to cover the unevenness of the bubble portion on the surface evenly.

(2) The strength of the applied coating film is required.

(3) It is necessary that the weight after application is as low as possible.

(4) It is necessary that the water permeation is low.

Performances such as are required.

[Problems to be solved by the invention]

In view of these circumstances, the present invention has been variously studied. As a result, the above-mentioned (1), (2),
It was found that the performance as in (3) and (4) is improved. That is, the present invention is a coating composition in which potassium titanate fibers are mixed with a modified polyester resin emulsion, and silica sand and a pigment are further mixed.

[Means for solving problems]

In the present invention, by mixing potassium titanate fibers with the modified polyester resin emulsion, a coating film having good coatability, good adhesion, and strength to a foam concrete plate or the like can be obtained.

Further, by mixing silica sand, it is possible to cover irregularities such as foamed concrete, and the thixotropic property due to the incorporation of potassium titanate fibers prevents the surface from being buried in air bubbles and makes the surface smooth.

The features of these are as follows. Modified polyester resin emulsion: It has a property of penetrating into concrete, stones, etc. and has good adhesion. It is a special modified polyester copolymer that is not any of the conventional acrylic, epoxy, vinyl chloride or urethane type, It has excellent abrasion resistance and heat resistance and is strong against salt, alkali and acid, and examples thereof include acrylic modified polyester resin emulsion, urethane modified polyester resin emulsion, and epoxy modified polyester resin emulsion.

Potassium titanate fiber: Since it is a whisker (fine single crystal fiber), it improves the coating strength as a reinforcing material that covers the surface of foamed concrete boards, etc. by imparting viscosity and thixotropy by the entanglement of whiskers. It is what makes me.

Silica sand: Used to cover irregularities such as foam concrete boards.

By combining these characteristics, the surface of foamed concrete or the like can be protected smooth and strong.

Modified polyester resin emulsion (solid content 25-
(35%) is 20% by weight or less, the coating film becomes brittle, which is not preferable. When it is 60% by weight or more, it is not preferable because it is difficult to adjust the viscosity and the workability is deteriorated. Further, when the mixing ratio of the potassium titanate fiber is 1% by weight or less, thixotropic property does not occur and dripping occurs, which is not preferable. When it is 20% by weight or more, the viscosity is increased and the workability is deteriorated, which is not preferable.

Silica sand may not be blended in some cases, but when blended, it is sufficient to use two types of silica sand together to make the surface unevenness uniform.
When it is blended in an amount of 70% by weight or more, the strength decreases, which is not preferable. The pigment may be omitted, but when it is blended, it may be blended up to about 10% by weight.

〔Example〕

 Examples of the present invention will be described.

Example 1 6 g of Teismo D as potassium titanate fiber was added to 33 g of a clear type of Permashield PSC-200A (New Zealand Monitors Co., Ltd.) as an acrylic modified polyester resin emulsion and mixed by a dissolver.

While stirring, 18 g of silica sand No. 5 and 43 g of silica sand No. 7 were mixed, and the mixture was uniformly mixed to obtain a paint. The obtained coating material was roller-coated or spray-coated on the surface of foamed concrete (Siporex) and dried at room temperature.

On the other hand, a conventional synthetic resin emulsion-based lysine was roller-coated or spray-coated on foamed concrete and dried at room temperature.

In the case of the coating composition of the present invention, the unevenness of silica remains on the surface, but covers the foamed part (foamed part) of the foamed concrete,
An average coating surface was obtained, but in the case of synthetic resin emulsion-based lysine (conventional case), after coating, the coating was impregnated along the irregularities of the foamed concrete and the surface was covered, but there were many irregularities. A face.

Example 2 When a silica-free coating material of Example 1 was prepared, and roller coating or spray coating was performed on the surface of foamed concrete and dried at room temperature, unevenness of silica sand was not left on the surface, and an average coated surface was obtained. Was obtained.

Example 3 3 g of Tesmo D as potassium titanate fiber was added to 20 g of a clear type of Permashield PSC-200A (New Zealand Monitors Co., Ltd.) as an acrylic modified polyester resin emulsion and mixed by a dissolver.

While stirring, 7 g of inorganic pigment (TiO ₂ ) and silica sand No. 70
g was mixed and the whole was mixed uniformly to obtain a paint. The obtained paint was roller-coated or spray-coated on the surface of the cement block and dried at room temperature.

On the other hand, a conventional synthetic resin emulsion-based lysine was roller-coated or spray-coated on foamed concrete and dried at room temperature.

In the case of the coating composition of the present invention, the irregularities of silica remain slightly on the surface, but cover the surface and cracks of the cement block,
An average coating surface was obtained, but in the case of synthetic resin emulsion-based lysine (conventional case), the coating was impregnated along the cracks of the cement block after coating, and although the surface cover was covered, it had a rough surface. Natsuta.

Claims (1)

[Claims] 1. A protective polyester resin emulsion (solid content 25-35) having the following composition for protecting the brittleness of the surface of a foam concrete plate, a cement block, etc.
% By weight) 60 to 20 (% by weight) potassium titanate fiber 1 to 20 (〃) silica sand 0 to 70 (〃) pigment 0 to 10 (〃)