SU810738A1 - Rubber mixture based on butadienenitrile rubber - Google Patents

Description

one

The invention relates to the rubber industry, in particular to the development of a rubber composition based on butadiene nitrile rubber.

A known composition based on butadiene nitrile rubber, comprising a mixture of sulfur vulcanization accelerators from dibenzthiazolyl sulfide and a heterocyclic amine, for example, 4H-1,3-oxazine derivative 1. However, this rubber composition requires a long time for vulcanization, and its rubber has reduced physical and mechanical properties.

The purpose of the invention is the acceleration of vulcanization and the improvement of the physicomechanical properties of rubber from this composition.

The goal is achieved by the fact that a rubber composition based on butadiene nitrile rubber (SKN), which includes a mixture of sulfur vulcanization accelerators from dibenzthiazolyl sulfide and heterocyclic amine, contains the heterocyclic amine - 7-nitroyl 7-amino-1,3,5-triaza-manganate; the latter to dibenzthiazolyl disulfide 0.45-2.77: 1 and the components of the composition are taken in the following amount, May. including: nitrile butadiene rubber 100, a mixture of accelerators 1.45-3.77.

Example 1. Preparing rubber mixtures on rollers using heterocyclic amines:

7-Nitro-1,3,5-triaza admantane (product

one). 7-amino-1,3,5-triaza admantane (product

2) - 4,4,6-trimethyl-4-metnlamino5, 6-dihydro-4H-1,3-oxazine iodohydrate (symbol of AO-CH3) is a prototype.

4,4,6-trimethyl-2-phenylamino5, 6-dihydro-4H-1,3-oxazine iodhydrate (symbol AO-CbNo) is a prototype.

The composition of the mixtures is presented in table. one.

Example 2. In table. 2 shows the experimental data on the kinetics of vulcanization at 143 ° C, taken on a Monsanto Reometr-100, as well as the physicomechanical properties of known and proposed vulcanizates. Rubber compounds based on diene rubber (SKN-40) are used, containing products 1, 2 and the prototype AO-SbNb, AO-CH3 together with DBTD in a 1: 1 ratio (vulcanization temperature 141 ± 1 C).

Given in Table. 2, the data suggest that the proposed rubber mixtures, as compared with the known ones, are characterized by lower values of the optimal vulcanization time by 10-

Table 1

table 2

Claims (1)

Claim Rubber composition based on nitrile butadiene rubber, comprising a mixture of sulfur vulcanization accelerators from dibenzothiazol disulfide and a heterocyclic amine, characterized in that, in order to accelerate vulcanization and higher Number 231 Order 502/6 on the physicomechanical properties of the rubbers from this composition, the latter contains 7-nitro or 7-amino-1,3,5-triazadamantane as the heterocyclic amine with the ratio of the latter to dibenzothiazolyl disulfide 0.45–2.77: 1 and components compositions are taken in the following quantity, May. h: 100 butadiene rubber, mixture of accelerators 1.45-3.77.