SU994505A1 - Rubber stock - Google Patents

Description

The invention relates to polymeric compositions based on synthetic rubber, which can be used for the rubber industry, in the manufacture of conveyor belts, molded machinery, cooking chambers, and diaphragms.

Known compositions based on a mixture of chlorosulfonated polyethylene with olefin and polymers 1.

Their disadvantage is low fire resistance and durability, as well as insufficient heat resistance.

The closest to the proposed technical entity is a rubber mixture based on butyl rubber and chlorosulfonated polyethylene with a ratio of components, wt.ch .:

Chlorosulfonated. polyethylene 80,0

Butyl rubber 20,0

Stearin0,6

Rosin2,0

Kaptaks1 35

Thiuram0.25

Magnesium oxide 1.6

Zinc Oxide1.0

Diphenylguanidine 0,3 Technical ulerod DG-100, 10,0

Bis (2,3-dibromopropyloxymethyl) phosphinic acid 2-10 Antimony trioxide2-8 Sulfur2.0 A known rubber mixture has good fire resistance 2.

However, this rubber composition is characterized by low elasticity, low relative elongation, low strength, insufficient curing rate and a heat resistance that means the quality of the products.

15

The aim of the invention is to increase the elasticity, strength and heat resistance obtained from the mixture of vulcanizate.

The goal is achieved by

20 that a rubber mixture containing a polymer base — a mixture of synthetic rubbers, carbon black, antimony trioxide, rosin, sulfur, magnesium oxide, zinc oxide, stearin, cap25, thiuram contains as

polymer base mixture of chlorobutyl rubber, chlorosulfonated polyethylene, polychloroprene and ethylene-propylene rubber, taken in a weight ratio of (4-6): (1-2) :( 2-1): (3-1), with the following component loss, May. h .; The above polymer base100 Technical carbon30-60 Antimony trioxide2-8 Rosin1.5-5 Sulfur1.5-2.5 Magnesium oxide 1-5 Zinc oxide1-5 Stearin0.5-1.5 Captax0.5-1.5 Tiuram0,2- 1 The preferred ratio of rubber in the polymer composition in terms of May. 50: 15: 15: 20 hours Example. A rubber mixture consisting of a polymer base and commonly used ingredients is prepared, the composition of which is presented in Table 1, on rollers in a rubber mixer at 6090 ° C, curing time 12 hours. Vulcanization is carried out at 151-160 ° C for 15-40 minutes preferably 20-25 minutes. The physicomechanical properties of the vulcanizates obtained on the basis of the proposed mixture in comparison with the prototype and control samples are given in Table. 2

Table From Table. 2 shows that the introduction of a complex polymer base from a combination of chlorinated, heat-resistant saturated polymers, polymers with low unsaturation and high fire resistance allows to obtain elastomers with a high complex of physical and mechanical properties, a combination of high elastic and strength properties, high heat resistance and fire resistance. The combined use of chlorobutyl rubber with caipolon, polychloroprene and ethylene-propylene rubber as a polymer base provides a synergistic effect, due to which vulcanizates with properties significantly exceeding the prota-type are obtained: 20-24%, with a high flame retardancy of the polymer composition and a 1.2-fold increase in the rate of vulcanization the cumulative effect of a complex polymer base exceeds that of individual polymers, binary compositions.

Claims (2)

Invention Formula Rubber mixture containing polymer. Basis - a mixture of synthetic rubbers, carbon black, suriium trioxide, rosin, sulfur, magnesium oxide, zinc oxide, stearin, captax, thiuram, characterized in that, in order to increase the elasticity, strength and heat resistance of the resulting from the mixture of vulcanizate, it contains as a polymer base a mixture of chlorobutyl rubber, chlorosulfonated polyethylene, polychloroprene and ethylene-propylene rubber, taken in a weight ratio of (4-6) 1 (1-2) :( 2-1) :( 3: 1), at the following ratio of components, mac. Said polymer base100 Carbon black Antimony trioxide Rosin Sulfur Magnesium oxide Zinc oxide Stearin Captax Thiuram Sources of information taken into account in the examination 1. A.A. Dontsov, et al. Chlorinated polymers. M., Himi, 1979, with. 111-112. 2. USSR author's certificate number 730740, l. C 08 L 23/34, 1977 (prototype).