SU604858A1 - Vulcanizable carbo-chain rubber-base compound - Google Patents

Description

The invention relates to the rubber industry, in particular to the development of a vulcanizable rubber mixture based on chain-chain rubber. A vulcanizable rubber mixture based on chain-chain rubber, such as nairit-II, is known, which includes an imidazoline derivative, in particular 2-mercaptoimidazoline (NA-22), as a curing scorcher. The rubber mixture with a known accelerator is characterized by unsatisfactory resistance to scorching, which complicates the process of its processing 1. In addition, rubber from such a mixture has low physicomechanical properties. physical and mechanical properties of rubber from the mixture. This goal is achieved by using as a vulcanization accelerator a rubber mixture of an imidazoline derivative selected from the group M, CT-bis- (2-methylpiperidinomethyl) - imidazolin-2-thione; M, N-bis-25 (decahydroquinolinomethyl) - imidazolin-2-thion in the amount of 0.5-1.0 weight. hours per 100 weight. rubber h. As a rubber vulcanization accelerator, 2-mer-30 toimidazoline derivatives (L, L-bis-substituted imioline-2-thione) of the general formula xV is used. CH, R is the residue of the general formula R-methyl, ethyl; R is hydrogen, methyl; , 2. As an example, use the following dinen. , M-bis- (2-methylpiperidinomethyl) - imidaIN-2-TION (UVS-5) N-CH. - I, C /. AT 2/

with a melting point of 78-79 ° C.

M, M-bis- (decahydrohipolinomethyl) - imidazoline-2-TRUN (UVS-3)

with a melting point of 126-128 ° C.

These compounds are colorless, crystalline, resistant to storage, soluble in many organic solvents.

Efficacy vulcanizing effect of the compounds was compared by a vulcanization activity of 2-mercaptoimidazoline (NA-22) in the non-filled rubber mixtures based on various rubbers, natural, nolihloroprenovogo, divinyl, acrylonitrile and ethylene-propylene (grade respectively NC, Nairit-P, SKD, NBR, EPDM ). The composition of rubber compounds and the main physico-mechanical properties of vulcanizates are given in table. 1-4.

Table 1

table 2

As can be seen from the table. 2 and 4, the introduction of the UVS-5 and UVS-3 accelerators into rubber mixtures based on the rubbers under investigation causes an increased resistance to scorch in comparison with mixtures containing 2-mercantoimidazoline (NA-22). Physicomechanical properties are also significantly higher in vulcanizates with the proposed accelerators.

When determining the optimal dosages of accelerators, it was established that when using the accelerator UVS-5 in an amount of from 0.5 to 1.0 weight. hours per 100 weight. including rubber, vulcanizates are obtained with the necessary complex of properties. When reducing the dosage of less than 0.5 weight. h. significantly increases the time to reach the optimum vulcanization, and at

T a b l II c a 3

Table 4

increasing dosage above 1.0 wt. h. decreases the resistance of rubber compounds to scorch.

Similar results were also obtained with the UVS-3 accelerators.

Claims (1)

Invention Formula Vulcanized rubber mixture based on chain-chain rubber, includes, and the vulcanization accelerator is an imidazoline derivative, I differ, and with the aim of improving the resistance of the mixture to vulcanization, as well as improving the physicomechanical properties of rubber from this mixture, it contains the imidazoline derivative vulcanization accelerator selected from the broth N, N-bis- (2-methylpiperidinomethyl-imidazOLIN-2-TION, M, N-bis- (decahydroquinolinomethyl) -imidazolin-2-thion, in an amount of 0.5-1.0 parts by weight per 100 parts by weight of rubber Information sources taken into account in the examination 1. US Patent No. 2222867, cl. 260-78.6, UA.1940.