JPS58194784A - Impregnating liquid for gypsum formation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention provides a gypsum molded product which is impregnated into a gypsum molded product to prevent resin content from volatilizing from the surface of the gypsum molded product and to prevent the gypsum molded product from shrinking during hardening. This relates to an impregnating liquid.

Conventionally, flexible plaster, which is easy to process, is processed to produce prototypes for statues, building materials, molds, etc., and in order to ensure that the plaster moldings last for a long time, the soft plaster moldings are impregnated with resin liquid and then plaster molded. There were times when I had to harden my body.

By the way, as the impregnating liquid for curing this gypsum molded body, impregnating liquids mainly made of polyester or incyanate were used for acrylic threads and oligomers, but
When such an impregnating liquid is used, the resin content evaporates from the surface of the gypsum molding and no resin remains on the surface of the gypsum molding, resulting in poor strength, chemical resistance, and water resistance of the gypsum molding, resulting in poor surface properties. was not improved, and the condition was extremely bad for the gypsum molded body.

Furthermore, when a plaster molded body is hardened by an impregnating liquid, the molded plaster shrinks significantly, and as a result, it is not suitable for precision objects.

Furthermore, impregnation caused various inconveniences such as distortion of the gypsum molded body and cracks in the gypsum molded body.
It was hoped that an impregnating liquid would be developed that would further improve the surface properties of gypsum molded bodies.

Therefore, in view of the current situation, the present invention aims to solve the above-mentioned drawbacks by adding 100 parts by weight of methyl methacrylate to 100 parts by weight of methyl methacrylate.
0-200 parts by weight, diphenylethane or methane 5
By providing an impregnating liquid for gypsum molded bodies in a ratio of ~200 parts by weight and 0.05 to 5.0 parts by weight of peroxide, it is possible to prevent the resin from evaporating from the surface of the gypsum molded body. , the shrinkage of the gypsum molded body during hardening is reduced.

Methyl metal acrylate, which is the main component of the impregnating liquid of the present invention, has the property of being easily permeable but easily volatilized. Therefore, this methyl metal acrylate was mixed with penzole peroxide or azobisisoputilonyl-IJ for 30 minutes.
% polymerized and stopped with a polymerization terminator,
By mixing and using methyl metal acrylate, it becomes easy to impregnate and difficult to volatilize. Further, when polymerizing with an organic peroxide such as penzole peroxide or azobisisobutyronitrile, the gypsum molded body can be uniformly hardened without any time lag. At this time, the blending ratio of methyl methacrylate and penzole peroxide is such that penzole peroxide is blended with respect to methyl methacrylate, and a polymerization terminator such as hydroquinone is used to obtain a 30% polymer of methyl methacrylate. And, based on 100 parts by weight of the methyl methacrylate, a 30% polymer of this methyl methacrylate YIO~200
It is to be blended in the proportion of 1 part.

To 100 parts by weight of this methyl methacrylate, 110 to 200 parts by weight of a 30% polymer of methyl methacrylate was blended with methane-based or ethane-based diephenyl hydrocarbons (phenylethylphenylethane, phenylmethylethane, phenylorthoxylyl). By adding 5 to 200 parts by weight of low viscosity, high boiling compatibility (with impregnating liquid) such as ethane, phenylmethaxylylethane, phenylparaxylylethane), the gypsum molded body is made elastic and when hardened. shrinkage can be reduced.

In addition, the gypsum molded product in the present invention refers to a flexible material that is easy to process, processed into a prototype of a statue, building material, or mold, and then impregnated with the impregnating liquid having the above-mentioned composition to harden the gypsum molded product. It is something to preserve. , 1 Comparing the performance and effects of the impregnating liquid with this structure and the conventional impregnating liquid, the following results were obtained.

As mentioned above, the impregnating liquid of the present invention and the conventional impregnating liquid are superior to the conventional impregnating liquid in terms of impregnation rate, shrinkage rate, linear expansion coefficient, compressive strength, etc.

As described above, according to the present invention, by impregnating the gypsum molded body with the impregnating liquid of the present invention, it is possible to prevent the resin component from volatilizing from the surface of the gypsum molded body, and as a result, it has sufficient hardness. In addition, a gypsum molded body with improved chemical resistance, water resistance, and so-called surface physical properties can be obtained.

In addition, impregnating a plaster molded body with this impregnation liquid makes the plaster molded body elastic, and as a result, shrinkage during curing of the plaster molded body can be reduced, making it ideal for curing precision plaster molded bodies. It is.

Furthermore, it has the effect of preventing distortions and cracks that occur in the gypsum molded body during impregnation of the gypsum molded body.

Claims (1)

[Claims] For gypsum molded bodies consisting of 100 parts by weight of methyl methacrylate, 10 to 200 parts by weight of a 30% polymer of methyl methacrylate, 5 to 200 parts by weight of diphenylethane or methane, and 0905 to 5.0 parts by weight of an organic peroxide. Impregnation liquid.