JPH04128005A - Cosmetic method for inorganic building materials - Google Patents

Abstract

PURPOSE:To make the title mineral building material into a beautiful surface having favorable adhesion without generating a vice by a mold release agent, by a method wherein a high-boiling solvent, which has compatibility with an emulsion coating and is for emulsion coating, is fed to the surface of a molded body as a mold release agent prior to pressing of the molded body, in a decorative method of mineral building material. CONSTITUTION:In case of an acrylic styrene emulsion resin coating, for example, butyl cellosolve, butyl cellosolve acetate and butyl cerbitol acetate are used as a high-boiling solvent for an emulsion coating. Since the high-boiling solvent is hard to evaporate and a liquid state is held for a period up to completion of pressing after applying the solvent to a press board, the same is functioned sufficiently as a mold release agent. Moreover, since the high-boiling solvent is the same as a film making auxiliary component improving film forming properties of the emulsion coating, in the case of performance of the emulsion coating after the pressing, the high-boiling solvent becomes compatible with the emulsion particles, infiltrated into a cement base during the later primary curing and the coating having favorable adhesion is formed. With this construction, the adhesion of the coating to be applied to after a press process is made favorable very much and chalking also can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for decorating inorganic building materials, and more particularly to an improvement in a method for decorating inorganic building materials that uses both pressing and colored painting.

(Prior Art) Conventionally, building materials such as roof tiles and wall boards have been widely manufactured using cement as the main raw material.

However, the above-mentioned inorganic building materials have an achromatic background color ranging from grayish-white to grayish-black, and if left as is, they lack design qualities, and the surface is highly water-absorbing, so surface painting with water-resistant treatment is usually performed. be exposed.

In addition to the above-mentioned surface coating, in order to add further design features, we apply an uneven pattern to the surface by pressing, and in the case of roof tiles, we press extruded molded bodies and give them complex shapes. Shaping is done.

In this case, a mold release agent is usually used to prevent the molded product from adhering to the press plate during the pressing process, and this mold release agent is mainly composed of mineral oil.

[Problems with conventional technology]

By the way, in the above-mentioned decorative method for inorganic building materials, when the pressing process and the coloring process are used together, the mold release agent used in the pressing process remains and adheres to the surface of the molded product.
This had the disadvantage of causing paint film peeling.

Furthermore, since the above-mentioned mineral oil has low affinity with emulsion paints, the applied paint is repelled and does not penetrate well into the base material.As a result, efflorescence precipitates during the next curing, and the applied paint is repelled and does not penetrate well into the base material. There was a problem that the film became chalky. This chalking is most noticeable during low temperatures, such as in winter, when emulsion paints are slow to harden.

[Problem to be solved by the invention]

In view of the above-mentioned problems, this invention is an inorganic building material that has good adhesion and can be made into a beautiful decorative surface without causing any harmful effects due to the release agent when the pressing process and the coloring process are used together for surface decoration. The purpose of this work was to provide a cosmetic method for applying makeup.

[Technology to solve problems]

That is, in the cosmetic method for inorganic building materials of the present invention, a slurry made of a cement mixture is extruded, the molded product is pressed, and then the molded product is colored with an emulsion paint and cured. In this process, a high boiling point solvent for emulsion paints which is compatible with emulsion paints and is used as a mold release agent is sprayed onto the surface of the molded body, and after pressing, the molded body is colored and painted with the emulsion paints, and then cured. It is something to do.

[Effect]

This invention is based on extrusion molding, and also on a manufacturing method in which a surface decoration is applied to the extruded product by a combination of pressing and colored coating.

In this invention, the above-mentioned high boiling point solvent for emulsion paints, which is compatible with the emulsion silane paint used for color painting, is used as a mold release agent in the pressing process performed prior to color painting.

As the high boiling point solvent for the emulsion paint that is compatible with the emulsion paint, in the case of an acrylic-styrene emulsion resin paint, butyl cellosolve,
Butyl cellosolve acetate, butyl cerbitol acetate, hexylene glycol, texanol, etc. are used.

These high-boiling point solvents are difficult to evaporate and remain liquid from the time they are applied to the press plate until the end of the press, so they function well as mold release agents.Moreover, these high-boiling point solvents are compounds that improve the film-forming properties of emulsion paints. Since it is the same as the film auxiliary component, it is well compatible with the emulsion particles when emulsion coating is performed after pressing, and during the subsequent primary curing, it penetrates into the cement base material and forms a coating film with good adhesion.

〔Example〕

Next, this invention will be explained in detail.

A slurry having the composition shown in Table 1 was prepared according to a conventional method, and a plate-shaped body having a thickness of 1.2 mm and a width of 3 mm was extruded using an extruder.

The molded body was cut into pieces of 20 cm and fed into a press mold coated with butyl cellosolve, butyl cellosolve acetate, butyl cerbitol acetate, hexylene glycol, and texanol as mold release agents, respectively, to give a surface uneven pattern.

Immediately apply acrylic-styrene emulsilon paint with a solid content of 46 to 50% to the surface of this press-formed body.
It was coated at 75g/rd and autoclaved for 8 to 12 hours at 60°C and 95YRH.

In addition, as a comparative example, a mold release agent was pressed using machine oil.

Regarding the above-mentioned Examples and Comparative Examples, the products after curing were subjected to an initial adhesion test using a substrate test, a boiling water immersion test, and a freeze-thaw test under the following conditions.

The results were as shown in Table 2.

Freeze-thaw test: Maintain 20°C for 2 hours, then cool from 20°C to 120°C over 2 hours, maintain 20°C for 2 hours, then heat from 120°C to 20°C over 2 hours. This was repeated as a cycle.

*1 Cellotape adhesion test using J T 55400 *2 Immersion test for 1 hour in boiling water at 95°C or higher using J I 35400 Evaluation in Table 2: O... No abnormalities in appearance △... Some abnormalities in appearance ×・...Indicates an abnormality such as chalking.

As is clear from Table 2, in the Examples of the present invention, coating film abnormalities such as coating film peeling and chalking caused by the mold release agent did not occur at all.

[Effects] As described above, according to the method of this invention, since the solvent of the emulsion paint is used as a mold release agent, the adhesion of the paint applied after the pressing process is very good, and chalking etc. can be prevented. It has the following effects.

Claims (1)

[Claims] (1) Extrusion molding of slurry made of cement mixture,
In a cosmetic method for inorganic building materials in which the molded body is pressed, then colored with an emulsion paint, and then cured, a high boiling point solvent for the emulsion paint, which is compatible with the emulsion paint, is removed before pressing the molded body. A method for decorating an inorganic building material, characterized in that it is supplied as an excipient to the surface of the molded article.