SU956516A1 - Vulcanizable rubber stock - Google Patents

Description

(54) VOLKANIZABLE RUBBER MIXTURE

The invention relates to rubber rinsing, in particular to the development of a vulcanizable rubber compound based on chloroprene rubber.

A known rubber blend based on chloroprene rubber IJ containing ethylene thiourea as a vulcanization accelerator (2-mercaptoimidazoline, Merkazin I, NA-22) ..

A disadvantage of the known ethylene thiourea mixture is the increased tendency to scorch.

The most to the proposed technical essence is a woo; 1kanizuema rubber mixture based on chloroprene rubber, including zinc oxide, magnesium oxide and as a vulcanization accelerator substituted benzimidazoles 2J.

The disadvantage of this rubber compound is an increased tendency to scorch.

The purpose of the invention is to increase the resistance to scorch.

The goal is achieved by the fact that a vulcanizable rubber compound, including chloroprene rubber, zinc oxide, magnesium oxide, and a vulcanization accelerator, contains

as a vulcanization accelerator anthra- (1,2d) -imidazolin-2, b, ll-triion of the general formula

Va

XO

ten

h

about ri

where R is hydrogen or halogen;

R is hydrogen or alkyl, in the following ratio of components, parts by weight:

Chloroprene

100 5-10 rubber Zinc oxide 4-10 Magnesium oxide

20 Specified acceleration0.05-1. vulcanization body. The method of obtaining these compounds is known.

Example 1. In rubber mixture 25 having a composition, parts by weight: chloroprene rubber 100, paraffin 3, neozon D 1, carbon black PM-7550, zinc oxide 5, magnesium oxide 10, 0.051 parts by weight are introduced. anthra- {1,2.a) -imidazolin-2, 30 6,11-trione. Rubber compounds are prepared on Nairit Kr-50 standard rubber. Zinc and magnesium oxides are used as vulcanizing agents, their usual dosage when used together is 9-20 weight, h. Zinc and magnesium oxides are used in quantities. Paraffin is used as a dispersant with, in order to evenly distribute the ingredients in the mixture, the usual dosage is 2-3 parts by weight. Neozon D is used as an antioxidant, the usual dosage is 1-2 parts by weight. I1M-75 carbon black is used as a filler, the usual dosage is 10100 parts by weight. For comparison, the rubber mixture with benzimidazolIN-2-ONOM is prepared and tested. Rubber mixtures are prepared according to the standard technique and vulcanized at 143 ° C for various times. The results of testing rubber compounds and rubbers of them are given in the table. Example 2. The composition of the rubber mixture specified in Example 1 is 0.05–1 wt. 5-bromantra- (1,2, d) -imidazoline-2,6,11-trione. Rubber mixtures are prepared and tested as indicated in Example 1. The results are shown in the table. Example 3. 0.05-1 pbw weight was added to the rubber mixture as specified in example 1. 1-methylanthra- {1, 2, d) -imidazolin-2, b, 11-trione. Rubber compounds are prepared and tested as indicated in Example 1. The results are listed in the table. Example 4: The rubber composition of the mixture specified in Example 1 is 0.05-1 parts by weight. 1-ethylanthra- (1, 2, d) dazolin-2., 6, 11-trione.

Izves-.na rubber mixture

nineteen

10 20 30 40 50

0.10

350

118

12,173

8 320 187

8 300 194 290

8,280,195

8 Rubber compounds are prepared and tested as indicated in Example 1. The results are shown in the table. From the above / in the data table it can be seen that the proposed rubber mixture substantially exceeds the mixture .21 in SUSTAINABILITY to vulcanisation. If a known mixture has time before the start of scorching at a vulcanization accelerator dosage range of 0.1-1 wt.h. is 6.5-8 minutes, and T35 is in the range of 17.5-19 minutes, then for the proposed mixture using 0.05-1 weight.h. various accelerators, these figures are, respectively, 24-31 and 35-50 minutes. Thus, the resistance to scorching of the proposed rubber mixture is 3-4 times higher than the known one. According to the speed of vulcanization and the physicomechanical indicators of rubbers: the mixture offered and known are almost equivalent. When the content of the vulcanization accelerator in the proposed rubber mixture below 0.05 weight.h. vulcanization rate -. the mixture is reduced below the rate of vulcanization of a known mixture. When the content of the vulcanization accelerator more than 1 you.h. The resistance to scorching of the mixtures is markedly reduced. The examples show the performance of rubber mixes. And rubber of them with boundary and average dosages of vul. Accelerators of the proposed rubber mixture. The technical and economic efficiency of the present invention is to significantly increase the stability of the rubber mixture to vulcanisation,. in improving the performance of the mixture, determining its technological properties.

6.5

1.00

0.05

25

25

0.25

24

1.00

29

0.05

23

0.25

Table continuation

16 12 10 8 8.

12

12

eight

eight

eight

12

ten

eight

eight

eight

12

eight

eight

6

6

12

ten

eight

eight

8 16

12

Table continuation

0.25

29

48

1.00

25

42

Table continuation

210

150

0 10 20 30 40 50 10 20 30 40 50

300

8 190 120 350

12 210 130 340

12 212 138330

10 21.0 148

8 330 153 211 320

8,134,190

12 320 217 140

12 300 218 146

10,290,213,154

eight . 270 160 210 260

eight

Claims (1)

Claim Vulcanizable rubber mixture comprising chloroprene rubber, zinc oxide, magnesium oxide and a vulcanization accelerator, characterized in that, in order to increase the resistance to vulcanization, it contains anthra- (1,2, d) -imidazolin-2, 6 as a vulcanization accelerator , 11-trion of the general formula where R ₍ -. Hydrogen or halogen; R ₂ is hydrogen or alkyl, in the following ratio of components, 35 parts by weight: Chloroprene rubber Zinc oxide Magnesium oxide 100 5-10 4-10 Specified vulcanization accelerator 0.05-1