SU1047925A1 - Method of producing rubber stock - Google Patents

Abstract

A METHOD FOR OBTAINING A RUBBER MIXTURE by preliminarily mixing a chain-chain rubber with vulcanizuk dim agent and rubber powder in a hammer crusher to a particle size of comminuted rubber of 0.25-5 mm, followed by mixing in a rubber mixer or roller with technical carbon, as an example, as an agent and an agent. chitelles, characterized in that, in order to increase the elastic strength properties of rubber and reduce the cost of the rubber mixture, first mix rubber in a hammer mill fired powder and 10-30% sulfur The relative total amount thereof, and then in the mixer or on the remaining amount of sulfur valtsahs.

Description

The invention relates to the rubber industry, in particular to the development of a production method, a rubber mixture containing rubber powder. A known method of obtaining a rubber mixture by mixing diene rubber with a rubber crumb, sulfur (part of its total amount) and other ingredients, while crumb rubber is mixed with a part of sulfur in crumb crushing process on a crushing roller l. However, the rubber mixture obtained by a known method has unsatisfactory elastic-strength properties. With the closest to the invention, the method achieves a rubber mixture by pre-mixing carbon chain rubber with vulcanized 1; the first agent (n-nitrosodiphenylamine) and rubber powder in a hammer mill to a particle size of 0.25-5 mm, followed by mixing in a rubber mixer or on rollers with technical carbon, sulfur-accelerating vulcanizing agents areHTaj TO, e antioxidant and g and softener-w 2, reeine This method provides satisfactory physical and mechanical properties, but insufficiently high elasto-mechanical properties. In addition to this, due to the use of expensive h-nitrodiphenyl / inhaus with the cost of the rubber compound. The purpose of the invention is to increase the elastic-strength properties of rubber and reduce the cost of the rubber mixture. The goal is achieved by the fact that according to the method of obtaining a rubber mixture, preliminary mixing of chain-chain rubber 40 with a vulcanized agent and rubber powder, in a hammer mill to a particle size of crushed rubber of 0.25-5 mm, followed by mixing in a rubber mixer or roll mill j; with subsequent mixing in rubber reamers or on rollers with technical carbon, sulfur accelerators, vulcanizing agents, antioxidants and softener m, first mix rubber with rubber powder and 10-30% sulfur from about its amount in a hammer mill, and then in a rubber mixer or on rollers - with the remaining amount of sulfur. To carry out the proposed method, a rubber mixture of the following composition is prepared, May, hours: floor Bul 0, recovery center Measuring for sulfur 1 and measuring (1 min. exit bench Butadiene rubber C D 30 Butadiene-styrene SKMS 30ARKM-15 70 Sulfur 2.50 / i-Cyclohexyl-2-benzthiazolylsulfenamide 1.10 Zinc oxide 3.00 Oleic acid 1.00 Rosin 0.50 Styrene Indin resin 2.00 Microwax 2.00 Oil PN-6Ш 12 , 00 Phenyl-p-naphthylamine, 50 M Oenyl-M-isopropyl-phenylenediamine 1,00 6-Ethoxy 2,2,4-trimethyl-1, 2-dihydroquinoline 2,00 Phthalic anhydride 0.50 Technical carbon PM-100 60 , 00 Rubber powder 15, 00 As a rubber powder, crushed tread kanisate with a particle size of less than w is used. Example 1. Rubber is mixed in a crusher with 10% sulfur and an inoin powder. A coarse rubber powder is obtained in a combination of crushed gray rubber with a day particle size of 3 mm, which has a satisfactory flowability. The crushed rubber is then mixed with a roll mill with the remaining amount of s and the other ingredients of the rubber mixture. Vulcanization of the mixture is decanted under standard conditions. Example 2. Similarly, example 1f but take 20% sulfur. Example 3. Analogously to the example, but taking 30% of sulfur. Example 4 (prototype), Rubber shred together with rubber quiescence and additional vulcanizing agent p-nitrosodiphenylamine wt, h. ). Sulfur and druingrients are then introduced into the expired rubber in the rolls. The physical and mechanical characteristics of the re obtained from the rubber mixtures indicated are given in the table (revulcanization - 143 C, 50 min).

Conditional stress at 300% elongation, MPa

Conditional tensile strength

10.8

11.4

11.1

10.2

From the table it can be seen that the proposed method for the preparation of a rubber mixture allows to improve the elastic-strength properties of the rubber. Cost reduction is achieved with the exception of costly p -nitrosodiphenylamine. The calculation shows that the cost savings on basic materials in the manufacture of 1 ton of the mixture is 35.58 rubles.

Claims (1)

METHOD FOR PRODUCING RUBBER MIXTURE by preliminary mixing carboxylic rubber with a vulcanizing agent and rubber powder in a hammer mill to a particle size of crushed rubber 0.25-5 mm, followed by mixing in a rubber mixer or on rollers with carbon black, sulfur accelerating vulcanizing agents, antioxidant the fact that in order to increase the elastic strength properties of rubber and reduce the cost of the rubber mixture, rubber is first mixed with rubber powder in a hammer mill ohm and 10-30% of sulfur from its total amount, and then in a rubber mixer or on a roll mill with the remaining amount of sulfur. M SO go SP