SU836035A1 - Rubber mixture based on chloroprene rubber - Google Patents

Description

(54) RUBBER MIXTURE ON THE BASIS OF CHLOROPRENE RUBBER

The invention relates to the rubber industry, in particular, to the development of a rubber mixture based on chloroprene rubber. Known rubber compound based on chloroprene rubber. Including a vulcanizing agent, for example, oxides of zinc and magnesium in a ratio, weight. hours: 100: 5: 7 l. . However, this rubber mixture has increased usaakoy-during processing, high flour viscosity and low resistance to scorch. The purpose of the invention is to reduce the shrinkage of the mixture during processing, reduce it in Mooney stability and increase the resistance to scorch. The goal is achieved by the fact that a rubber mixture based on chloroprene rubber, (Nayrita KR-50), including a vulcanizing agent, as a vulcanizing agent, the mixture contains aegirin concentrate - a waste product of rare metal ores,% by mass: SiO, - 48 5-50.3; , 3.0-6.0; total iron 2O, O-23, O; Nan O - 13,013, 7; KjO - 1.0-1.2; MgO - 1.6-2.9; CaO - 2.3-5 ,. rvOj, up to lOO geo, Oi in the amount of 5-35 ma.ch. on 100 ma.ch. rubber The physicochemical properties of the aegirine concentrate are given below. Moisture content,% 0.5 pH of water extract “10.7 Specific surface area, m / g 2.0 The rubber mixture may contain ingredients commonly used in rubber technology, fillers, plasticizers, and etc. The rubber mixture is prepared according to the following recipe, mac.h,: Chloroprene rubber100 Stearic acid 0.5 Egirine concentrate 5-35 3 The rubber mixture is made on a laboratory roll mill in one station. Injection is carried out through a sprinkler machine with a diminutive temeratu. The casing and auger. Mouthshut 49-4955-6071-93 The calender is manufactured on a sheet calender at a temperature of Yachgam to determine the shrinkage of rubber cm. Samples were cured in an electrically heated press with plates. Thermal and mechanical parameters are determined according to GOST 270-75 by breaking strength, relative elongation and residual elongation; according to the Standard СЭВ 1О8-74, rebound elasticity; GOST 9.O24-74 hardness of TM-2; according to GOST 10722-76, Mooney viscosity is the time of the beginning of the sub-vulcanisacin T at a temperature of 12 ° C. GRIMER 1. On 10O May. h. chloe prenosou rubber (Naira KR-50) was entered on the rolls 5 mue.h. aegirin center and 0.5 May. h. stearic kis. lots. rubber mix and volcanic nizata are given below. Shrinkage. % 80 Tear resistance, MPa 23.0 Relative elongation,% 910 Residual elongation,% 15 Rebound elasticity,% 42 Hardness in TM-2, sr. units 35 Mooney Viscosity, cu. ea. 27 Time after the volcano aaimii. f- , L Example 2. On May 100 h. chloroprene rubber (Nairite KR-50 is introduced on rollers on May 15. parts of aegirine concentrate and 0.5 May. parts of stearic acid. The properties of the rubber compound and vulcanizate are given below. Shrinkage,% Tear resistance, MPa Elongation, % Residual elongation, / Э Elaetichesk on rebound,% Tvertsoyet on TM-2, standard units. In Muni, conditional. Time to start pouredpulcan Example 3 .. At 1 OO May of h. Of chloroprene rubber 25 may be added to the rolls of aegirine concentrate concentrate and O, May 5, of stearic kielota. Smeyetva rubber house and cuprate Figures below: 9.4 47 Tearing resistance,% 26.0 Relative elongation,% 850 Residual elongation,% 11 Edetotic, edema,% 42 Hardness through TM-2, elite 46 Mooney-viscosity 22 Start time of vulcanization. -, C Example 4. On 1OO May, the chloroprene rubber (nairite) is introduced on the rollers on May 35, part of aegirine concentrate and 0.5 May part of an eteranovye rubber. The properties of the rubber mixture and vulcanization are given below. Shrinkage,% 35 Tear resistance, MPa23.0 Relative elongation,% 91O Residual elongation,% 12 Elamino by odecco,% 42 Hard by T.M-2, ual. units 48 Zkoeet on Mooney, uel. units AOR The start time of scorching, T. ° C144O. For comparison, the following are the examples of rubber emei and vulcanizate based on chloroprene rubber, containing as vulcanizing agents, oxides of zinc and magnesium in the following ratios of components, May. h .: Rubber Zinc okio Ok magnesium Magnesium stearic acid Cutting,% Tear resistance, Elongation, Residual elongation,% Elasticity by rebound. That is the hardness of TM-2, uel. units Mooney viscosity, uel. ea, the start time of the vulcanisation. The examples show that the invention allows obtaining rubber capacities with shrinkage which is almost a times lower than that of the prototype and good technological properties - reduced by 0% compared to the prototype, visibility of p.o Mooney, besides emei haakterizuyutsya reduced in 3 times by

compared with the prototype propensity for pulverizing.

The optimal content of aegirin concentrate in the rubber mixture is 15-26 May. hours, after a further reduction or increase in its quantity leads to a decrease in the physical and mechanical properties of rubber.

In addition, the use of aegirin concentrate in the rubber industry, which is the dump product of the enrichment of rare metal ores, made it possible to solve a part of the general problem of environmental protection from pollution,

Formula I-3 gain

A chloroprene rubber-based rubber mixture comprising a vulcanizing agent, characterized in that, in order to reduce the shrinkage of the mixture

during processing, reducing its Mooney viscosity and increasing resistance to pavulcanization, as a vulcanizing agent, the latter contains aegirin concentrate — a waste product of enrichment of rare metal ores - composition, wt.yu: Si Oj48.5-50.3

L, O-6.0

20.0-23.0

MS "2.013.0-13.7

KdO1,0-1,2

6-2.9

CaO 2.3-5, O

TiOg, VgO; ve; if th o - before -Joo

in the amount of 5-35 mah. rubber h.

Sources of information taken into account during the examination 1. Handbook of rubberman, Chem., Moscow, 1971, p. 89 (prototype).

Claims (1)

Claim The rubber mixture based on chloroprene rubber, including a vulcanizing agent, is characterized in that, in order to reduce shrinkage of the mixture 836035 6 during processing, reducing its Mooney viscosity and increasing resistance to vulcanization, the latter contains an aegirine concentrate as a vulcanizing agent, the dump product of the concentration of rare metal ores - composition, wt.%: Sf О ₂ 48.5-50.3 а е _а о ₃ 3.0-v.o 20.0-23.0 Yu NctgP 13.0-13.7 K _g O 1.0-1.2 MgO 1.6-2.9 CaO ⁴ 2.3-5.0 Τϊο „, v ₂ cl; veo; zr about ₂ ; Th about ₂ - to Yuo 15 ^{z 7} in the amount of 5-35 wt.h, per 100 wt.h. rubber. Sources of information, _w taken into account in the examination 1. Directory of rubber worker, Chemistry *, M., 1971, p. 89 (prototype).