SU1323211A1 - Parting two-layer coat for pattern tooling - Google Patents

Abstract

The invention relates to a foundry industry and is used for applying to model tooling in the manufacture of casting molds. The invention of the invention is an improvement in the wear resistance of a coating. The goal is achieved due to the fact that the primer layer additionally contains alumino-bore silicate glass in the following ratio of ingredients, parts: 10% solution of polydimethylsiloxane rubber in gasoline 100; methyltriacetoxysilane 0.4-1.0; benzoyl peroxide 0.01 - 1.0; alumina borosilicate glass 0.1 - 1.0. The alumina-bore silicate glass powder is completely wetted with a primer solution and contributes to an increase in the adhesion forces of the adhesive and primer layers, which leads to an increase in the wear resistance of the coating. Upon completion of heat treatment of the primer layer, an anti-adhesive layer is applied to it in the form of a 30% solution of aluminosiloxane rubber in gasoline with a catalyst (5% solution of tin diethyl caprylate in ethyl silicate - 32), then it is dried. The two-layer separation coating, in the primer layer of which aluminum-bore silicate glass is contained, has an increased wear resistance and less adhesion to the surface of the model equipment of liquid-cold and cold-hardening mixtures. 2 tab. with SS (L with ND CO N3

Description

113232

. The invention relates to foundry production and is used primarily for applying an anti-adhesive coating on model tooling in the manufacture of sand-clay forms from cold-hardening core mixtures and liquid glass: Mixtures.

The purpose of the invention is to increase the wear resistance pokrpi

In separating coating as high polyol dimethylpolymethyl

The alumina-bore silicate glass powder is completely wetted with a ground solution and contributes to an increase in the adhesion forces of the adhesive and primer layer, which leads to an increase in the wear resistance of the coating.

The coating can be applied to the working surface of metal, half-dimensional and wood snap-ins.

- The coating is prepared as follows.

10 g of SKT rubber cut into small pieces are dissolved with mixing: in 90 g of gasoline B - 70, they are poured into a solution of OjOl-O, g of benzoi-l peroxide and not stirred until complete dissolution. Then pour 0.5 - g of catalyst K-TOC; and stirred with a rubber solution for 5-10 minutes, after which 0.1-1 g of aluminosilicate glass powder was introduced and the whole mass was stirred with a stirrer for 15 minutes. Rasvtor rubber can be used no more than 6 hours from the time of introduction of hardeners

The obtained primer composition is applied to the degreased surface of the part with a spray in two layers with a 30–60 min caked layer at a temperature of 18–35 ° C and subsequent heat treatment of the soil at a temperature of 150–120 ° C with a hardener content of K-IOC 0.4- 0.6 g or at

112

Siloxane rubber use synthetic rubber heat-resistant SKT, manufactured according to GOST 14680-69.

Benzoyl peroxide GOST 14888-69 and methyltriacetoxysilane are used as crosslinking agents.

As aluminosilicate glass using a technical product - powdered glass brand 4P or glass brand 209.

The glass composition is presented in table 1

Table 1

temperature 18-35 ° C for 24 hours with a hardener content higher

30 0.6 g. An anti-adhesive layer is applied to the surface of the soil cooled after heat treatment, no later than 24-48 hours, on the basis of a solution of low molecular weight aluminosilox-up rubber in AC-300 gasoline with a K-18 catalyst (5% - a solution of tin diethyl caprylate in ethyl silicate-32), which is cured for 24 hours at room temperature.

40 The release layer is dried at room temperature for 24 hours and the samples with the obtained release layer are directed to the study of wear resistance and adhesion.

five ..

The wear resistance of the coating was determined on a special stand simulating the effect of core mixtures on model tooling. The wear of the coating was determined by the weight loss of the sample after rubbing it in the core mixture, referred to the sacred initial weight,%. The adhesion was determined directly by the formation of specimens.

jj- on a cold-hardening mixture and was expressed in an increase in the weight of the sample after molding, referred to the initial weight of the sample,%. Test data are presented in table 2.

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As can be seen from Table 2, the proposed separation coating has an increased wear resistance, which will improve xa lecTBo surfaces and the clarity of the contours of the molds and cores and use the coating for forming cold-hardening and liquid-glass core mixtures.

Formula of invention

Separating two-layer coating for model equipment, containing a primer layer based on a 10% solution of polydimethylsiloxane rubber in gasoline with additives of benzoyl peroxide and methyltriacetoxy-silane and an antiadhesive layer on

Or N.Gorvat 2901/11

Compiled by I. Kunitska Tehred A. Kravchuk

Co Po

Circulation 740 VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Based on a 30% solution of aluminosiloxane rubber in gasoline with an additive in the form of a 5% solution of dithyl tin caprylate in ethyl silicate, which is due to the fact that, in order to improve the durability of the coating, the primer layer additionally contains the ratio of ingredients, ma.ch:

10% solution of polydimethylsiloxane rubber in gasoline 100 Methyl triacetoxysilane 0.4-1.0 Benzoyl peroxide 0.01-0.1 Algo-bromosilicate glass 0.1-1.0

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Claims (1)

Claim Separating two-layer coating for model equipment., Containing a primer layer based on a 10% solution of polydimethylsilox-15 new rubber in gasoline with the addition of benzoyl peroxide and methyltriacetoxysilane and a release layer on chuck in gasoline 100 Methyltriacetoxysilane 0.4-1.0 Benzoyl peroxide 0.01-0.1 Aluminoborsilicate glass 0.1-1.0