SU751815A1 - Vulcanized rubber mixture based on chloroprene rubber - Google Patents

Description

(54) VOLKANIZABLE RUBBER MIXTURE BASED ON CHLOROPRIC RUBBER The invention relates to the rubber industry and relates to vulcanizable chloroprene rubber based rubber compounds for the manufacture of products extruded under conditions of elevated temperatures. Known vulcanizable rubber mixture based on chloroprene rubber including phenyl and -naphthylamine ll However, rubber made on the basis of such a mixture has a low heat resistance Ep with prolonged exposure to elevated temperatures. The goal of the acquisition is to increase the heat resistance of rubber from a vulcanizable rubber compound based on chloroprene rubber. This is achieved by the composition of the proposed vulcanizable rubber compound based on chloroprene. rubber including phenyl-, I-naphthylamine, 2-aminothiazole-carboxylic acid was additionally introduced at the following ratio (components, parts by weight: Chloroprivate rubber1OO Phenyl-naphthylamine 1-3-2 O, 5 Example: In a rubber mixture of the composition, wt. H,: chloroprene rubber 10O, zinc oxide 3, magnesium oxide 7, stearin 2, paraffin 5, captais O, 25, dibutyl phthalate 5, chalk 57, kaolin 30, carbon black PM- 15 4O, phenyl-naphthylamine (neozone D) and 2-aminothiazop-4-carboxylic acid are administered in accordance with their dosages given in the table. t according to conventional technology and vulcanized for 50 minutes at 143 ± 2 ° C. The joint use of neozone D and 2-aminothiazole-4-carboxylic acid leads to a significant increase in the heat resistance of rubber.If the rubber on the rubber mixture of the prototype after 336 hours aging at 100 saves 43% of the initial relative elongation, then rubber From rubber mixtures containing additionally 0, 1, 0.2 and 0.5 tiec h 2 amino-tiazal-1-carboxylic acid, li

under the same conditions, this indicator is kept at the level of "48-58%. Rubber rubber compounds with 2 and 3 weight. h, neovon D, additionally containing 0, 2 h. 2-aminothiazop-4-carboxylic acid, after 336 hours of aging at 1 (30 ° C retains 66-68% of the initial relative elongation.

Benefits of sharing

 D 2-aminothiazop-4-carboxylic acid can be seen from a comparison of the product of the elasticity of rubber after aging, which takes into account both the change in strength and the change in relative elongation.

In tab. 1 shows the dosage of the stabilizer.

In tab. 2 shows the properties of rubber.

Neozon D

2-Aminothiaz ap-40, 1 carboxylic acid Rubber properties. Rubber mixture and 12

Before aging:

tensile strength "

at break, kgf / cm

relative extension , %

After aging at 1

tensile strength at break,% from baseline:

after 48 hours

in 144 hours

24 hours later

after 336 hours

Relative lengthening,% from initial:

after 48 hours

in 144 hours

after 240 hours

in 3-36 hours

Product elasticity% of source:

after 48 hours

 144 hour

0.5

0.2

0.2

table 2

105 1О4 Southwest 1O5

91

86

92 81

77 78 67 75 68 74 66. 58

87 79

89 81

97

84 d99IrO stabilizer, weight, h. A456

Claims (1)

Claims: Vulcanizable rubber mixture based on chloroprene rubber, including phenyl-A-naphtylamine, characterized in that, in order to increase the heat resistance of rubber from this mixture, the latter additionally contains 2-aminothiaz-1-4 carboxylic acid in the following ratio of components, including: Chlorop {eulyuvyy rubber SO } enyl-L-naphthylamine 1-3 2 - Aminothiaz op-4-k arbonic acid 0,1-DE, 5 Sources of information taken into account at aKCnepiHat. 1, Handbook of rubber. A. Chemistry, 1971, p. 327 (prototype).