SU487898A1 - Rubber compound - Google Patents

Description

The invention relates to the rubber industry, in particular to the production of rubber compounds based on chloroprene rubbers.

A known rubber mixture containing chloroprene rubber, fillers, vulcanizing agents, softeners, plasticizers, and stabilizer-polyhydrate of aluminosilicates of cubic (X) structure.

With the introduction of said stabilizing additive, the selective binding of hydrogen chloride occurs, with the result that the release of other gaseous and products remains quite high.

In order to reduce the gas emission of vulcanization, it has been proposed to introduce into the proposed rubber mixture based on polychloroprene as a stabilizing additive a combination of cubic aluminosilicate polyhydrate (X) and hexagonal type (L) structures in a ratio of 1-3: 1-3 in an amount of 0.5-1 , 0 weight. hours per 100 weight. rubber h.

The use of this combination of polyhydrates of aluminosilicates as a stabilizing additive provides a synergistic effect, due to which a reduction of gas evolution by 32-38% is achieved, while the use of polyhydrates of aluminosilicates by a known method of gas evolution by 8-12% (Table 1).

Example. Experienced rubber mixture of the following prescription composition, weight. h .: Polychloropre 100.00

Kaptaks0,225

DFG0,10

Zinc Oxide3.00

Magnesia oxide 7.00

Stearin2,00

Paraffin5,00

Kaolin30, WITH

Soot PM-1540.00

DBF5,00

Polyhydrates of aluminosilicates 0.5-1.0

prepared on laboratory rolls (temperature of the mixture is 30-40 ° C) and in a rubber mixer (temperature in the chamber is 80-100 ° C). Alumina-silicate polyhydrates before the introduction. The mixture is subjected to activation — heat treatment from 22 to 550 ° C for 5-5.5 hours. A combination of polyhydrates of aluminosilicates of type X and L, modified with sodium, calcium, potassium, and hydrogen cations, is introduced into the ratio of X: L 3: 1, 2: 1. 1: 1, 1: 2, 1: 3, in the amount of 0.5-1.0 weight. hours per 100 weight. rubber h. Reduced dosages of the components (less than 0.5 wt. H) do not provide a reduction in the total outgassing. With increasing content of iolihydra4 Table I

Combustion of aluminosilicates (more than 1.0 wt. h.) The effect of stabilization remains almost constant, as a result of which an increase in dosage is advisable.

The results of testing samples of polychloroprene rubbers for total gas evolution are given in Table. one.

The introduction of polyhydrates of aluminosilicates into the mixture based on polychloroprene, both in combination and of each type separately, does not impair the quality of the vulcanizates.

In tab. 2 shows the data of physical and mechanical tests obtained vulcanizates.

In the presence of aluminosilicate polyhydrates, there is a slight increase in tensile strength, a slight decrease in relative elongation, an improvement in heat resistance and a decrease in residual elongation of 8–12%, which positively affects the properties of finished products from polychloroprene mixtures.

table 2