SU517386A1 - Suspension for making ceramic molds on melted models - Google Patents

Description

the following ratio of components,

with weight

Refractory

fillerBase

Ethyl silicate 4,0-8,5

Sol on acid0.10-0.3

Sulfuric acid 0.15-0.3

Organic solvent11-19

Water2.0-10.0

Polyfunctional belt-containing oligomer 0.60-5.0

Polydiphenyltetrafurfur, ilac sidiloklokan or titefurfuryl oxysilane (TFSA-4) or their mixture in the ratio of 2: 1 can be used as the proliferative oligomer.

The introduction of these additives leads to the formation of the product of their joint hydrolysis with ethyl silicate, which provides a greater degree of structuring of the binder, both in the mold holding stage under normal conditions and at high temperature. Thereby, an increase in the strength of the non-calcined forms to 38 kg / ohm

reducing the performance properties of the calcined forms. In addition, the curing time of the shell layer is significantly (a 50%) reduced.

Increasing the content of these additives by more than 5%, although leading to an increase in the mechanical strength of the non-rolled form, however, reduces the survivability of the suspension and the strength of the mold after calcination.

Suspension technology.

A mixture of ethyl silicate and a modifying agent, acetone, acidified with water, is added to the container while the agitator is rotated (2800 o.b / min). Then load powdered quartz. In the process of mixing the above components, hydrolysis proceeds, accompanied by an exothermic effect, expressed in raising the temperature of the mixture to 25 - 35 ° C. Mixing time 40-50 minutes. The viscosity of the mixture immediately after its preparation should be within the BZ-40 s.

To obtain the composition of the proposed composition, mixtures 1–7 were prepared. The content of the components in them and the mechanical properties are given in the table.

It follows from the table that the addition of 0.6–5% of a polyfunctional silicon-containing oligomer and ethyl silicate leads to an increase in the strength of the shell forms M by 1.5.

Claims (1)

fold and eooiiBeTctiBeHHO specificity of the resistance of the box increases. The use of this composition will allow to obtain durable forms. While saving ethyl silicate. The claims of the suspension for the manufacture of ceramic molds in melted models, B1Accumulative refractory filler, ethyl silicate, hydrochloric acid, sulfuric acid, organic solvent and water, in order to increase the hardenability of the forms and reduce the curing time of the suspension, its composition as a hardening additive it contains a poly-functional cream containing an oligomer - aryl- (alkyl) -furfuryl-oxysyl-xan of the general formula R "SiO ™ (00) & OH (OH)", where R is alkyl, aryl, F-furfuryl. p 0.5-2.5, t 1-2, k 1-3, Z 0.1-0.5, namely polydiphenyltetrafuryl oxydisiloxane or polytetrafuryloxysilane, etc., and the following ratio of ponents, weight%: Refractory filler: Ethyl silicate base 4.0-8 , 5 Sol per acid0.10-0.3 Sulfuric acid 0.15-0.3 Organic solvent 1) 1.0-19.0 Water2.0-10.0 Polyfunctional silicon-containing oligomer0, 60-5.0