SU726134A1 - Rubber mixture - Google Patents

Description

(54) RUBBER MIXTURE

one

The invention relates to the rubber industry, in particular to the development of a rubber compound.

A known rubber compound comprising an ethylene propylene / ethylene or ethylene propylene copolymer with secondary hydroxyl groups and a vulcanizing agent diocyanate l.

Rubber from this mixture has unsatisfactory physical and mechanical properties. In addition, the mixture can be vulcanized only at high temperature.

The purpose of the invention is to increase the physical properties of rubber properties, as well as lower the temperature of vulcanization of the mixture. .

This chain is achieved by the fact that the rubber mixture, including ethylene propylene diene ethylene propylene copolymer and vulcanizing copolymer, contains a copolymer with primary t and hydrocryl groups and a vulcanized agent selected from grutt: compost from tetra-

ethoxysilane or the product of its incomplete hydrolysis and dialkyldiacil connection

tin when the ratio, respectively

50-75: 25-50, methyltriacetoxysilane or ammonolysis product mixture of chlorosilanes in the amount of 1-10 mass. hours at 1OO mass. rubber

The invention is illustrated by examples.

Example 1. Rubber mixture

It is prepared on the basis of a copolymer of ethylene, propylene, n-norbornencarbinol (SKEPOL) with a Muki viscosity of 38, a propylene content of 37 mol.%, and a norbornencarbinop content of 1.2 air-stuff. The product of the ammonolysis of a mixture of chlorillanes (MCH-7) is used as a vulcanizing agent. The offset is carried out on a laboratory roll size

320x160 mm at 25 ± 5 ° С for 10 min.

The recipe, {ebzhim vulcanization and physical and mechanical properties of the obtained vulcanizers are given in table. one.

Table 1 Cure time at 25 ° C, Tear resistance, kgf / cm, Relative lengthening G Residual replenishment,% P, p 19 me r 2. The conditions for the rubber compound are similar. of example 1. As a vulcanizing agent, the product of the partial hydrolysis of tetraethoxysilane is used (the ES is measured with a catalyst and the reaction of tin dibutyldylurine tinate / {DBD ratio 1: 1. Rez ptaty pr. Table 2., .. Table Rubber, weight, h. ES- 4b and DBLO, parts by weight (1: 1)

Methyltriacetoxysilane,.

MSN-7, Beci h.

Posodol; 1 (. Table. 2

Table 3 The duration of vulcanization at 25 ° C, h. Tear resistance, kgf / cm Relative elongation,% Residual elongation. PRI me R s 3-6 and 6 (control). Rubber mixtures totov t based on ethylene-propylene rubber containing 0.12 wt.%. hydroxyl groups, with a characteristic viscosity (g)) 0.8 in tetralin at 130 ° C and a propylene content of 40 mol%. As vulcanizing agents, ES-4p is used in combination with tin diethyldicaprolate (DZDKO) in a ratio of 75:25, methyl-triacetoxysipan MCH-7. The introduction of hardeners is carried out in a 1O% - "rubber solution in gasoline at room temperature. After thorough mixing, the solutions are poured into molds. The vulcanization is carried out at room temperature for two days. After that, to completely remove the solvent, the forms with the composition are kept in a thermostat at 80 ° C for 2 hours. The recipe, the vulcanization mode and the physico-mechanical properties of the vulcanizates are given in table. 3. For comparison, in the same table, the properties of the rubbers obtained at 15 ° C using the mixture of dicumyl peroxide (PD) and sulfur (S) as a vulcanizing system are given.

PD + S, weight.h.

Volcano temperature

Curing time, h

Tear resistance kgf / cm

Relative extension , %

Residual elongation

Heptane swelling for 72 hours at

before aging

. after aging at 2OO C for. 3 hours

EXAMPLE 7-9. The conditions for the preparation of the rubber mixture are similar to those of Example 1. ES-40 is used as vulcanizing agents in combination with DEDCO, methyltriacetoxysilane and MCH-7. - Rubber compounds are prepared on the basis of an ethylene-propylene terpolymer copolymer with a Flour 43 viscosity containing 3.2 wt.% Ethylidenenorbornene, 1 wt.% Norbornencarbinol, 42 mop,% propylene. Recipe mix

Indicators

Methyltriacetraxysilane, wt. h,

MCH-7, weight. h

Vulcanization temperature, С

Time volkapi.) 1, h

Continued table. 3

3 + O, 4

2 48

150 1.0

YU

250

45О 4 22

480

450

26O

26O

17O

280

GIS vulcanization and physico-mechanical properties are given in Table. four.

Example 1O. The rubber mixture is prepared on the basis of eTftneriifip 6HKif6ftb 5t o copolymer with a characteristic viscosity of 0.58, containing 4.8 air-content.% Ethylidene norborna and 0.5 weight,% hydroxyl ppynn. Provided cooking. mixtures and vulcanization mode anayo ichny example 3,

Table 4

Example

6

5,100

100

one

one

Tear resistance,

kgf / cm

Relative extension,

%

Residual elongation,%

Swelling in heptane for 72 hours at 25 ° С

As a vulcanizing agent use the sit-7 in the amount of 1 weight. h on 1OO weight, h, copolymer.

The physicomechanical properties of rubber are:

Tear resistance, kgf / cm 11

Relative elongation,% 300

Residual elongation,% 12

Thus, it uses as agents vulkynizuyuschih organosilicon compounds such as tetraethoxysilane or partial hydrolysis products thereof in combination with compounds dialkildiatsilnymi tin alknlatse- toksiproizvodnye silicon product ammonopiza hlorsilanyv or mixtures thereof, allows to carry out the vulcanization process at low temperatures in weight , as well as in an inert carbon-hydrogen solvent medium and obtain reeins, which are superior in physicomechanical properties, obtained using known curing systems (at high cure temperatures).

Continued table. four

15

325 22

338

Claims (1)

1. US Patent No. 367-9627, cl. 260-41.5, publ. 1972 (prototype).