SU767145A1 - Chloroprene rubber-based rubber mixture - Google Patents

Description

, one. ;

The invention relates to the rubber industry, in particular to the development of a rubber compound (resistant to cushioning) based on hdoroprene rubber, to obtain-. no heat resistant rubber.

A known rubber compound based on zsdoroprene rubber (nairite), comprising a vulcanizing agent — oxides of magnesium and zinc 1.

However, the known mixture is characterized by unsatisfactory resistance to premature vulcanization, and rubber from D-mixed and insufficient heat resistance.

The purpose of the invention is to improve the resistance of the mixture to scorch and to improve the resistance of rubber from it to heat aging.

The goal is achieved by the fact that the rubber mixture based on chloroprene rubber, includes portland cement composition, wt.%, As a vulcanizing agent. 0

SiOj22-24

ASzOz5,5 - 6,3

RegOz2,8 - 3,6

0.1 - 2.5

MDO 5Oz 2-3 KjO 0.4 - 0.7

Cao To 100

in the amount of 10-50 wt.h. per 100 wt.h. rubber

The content of alagi is 0.6-0.9%; alkalinity in terms of CaO 3.2–4.2%; The specific surface area is L5 and the pH of the water extract is 10-11. I A rubber mixture may contain a traction: ingredients in rubber technology: plasticizers, fillers, etc. For example, composition (mixture by weight parts: chloroprene rubber 100

Stearic acid 0.5

Portland Cement 10-50

Claims (2)

The production of rezhnov mixtures produced on a laboratory roll mill in one stage. The resulting rubber mixtures are vulcanized in a press at 143lO, 5 ° C for 20 minutes. Example 1. Per 100 wt.h. chloroprene rubber (Nairit brand Kr-50) is introduced on the rolls 10 March.h. Portland cement and 0.5 wt.h. stearic acid. .. - .. 3 ... Properties of rubber based on chloroprene rubber (nairit Kr-50) containing 100 m of the proposed vulcanizing agent per 100 wt.h. rubber Strength at: rupture, kgf / cm (MPa) GOST 270-64190 / 19 Relative elongation,% (GOST 270-64) 950 Residual elongation,% (GOST 270-64) l6 Hardness - according to TM-2 ..; (GOST 263-53): 33, Rebound elasticity,%. (GOST 6950-54) 40 Heat aging coefficients (72 h at 100 ° С, GOST 271-67), 78 Starting time of scorching at 120 ° С, Min (GOST 10722-64) 25 Example 2. At T 00 parts by weight, chloroprene rubber (Nairit Cr-50) are injected in cts, 20 parts by weight, of portland cement and .0.5 parts by weight. stearic acid. -. Properties of rubber based on chlorourene rubber nairit Cr-50 containing 20% by weight of a vulcanizing agent per ICE parts by weight rubber Tensile strength at break, kgf / cm (MPa) (GOST 270-64) 220 Relative elongation,% (GOST 270-64) .900 Residual elongation,% (GOST 270-64) 16 Hardness according to TM-2, unit. GOST 263-53) 38 Elasticity by rebound,% (GOST 6950-54) 40 Heat aging coefficients (72 hours at 100 ° C, GOST 271-67) K, ° C Start of vulcanization at 120 ° C, min. (GOST 10722 -64) 22 Example 3, At 100 wt.h. The chloropr of the new rubber nairit Kr-50 is administered on cts 30 wt.i. Portland cement and 0.5 wt.h. stearic acid. The properties of rubber based on chloroprene rubber nairit KR-50, containing 30 wt. Of the proposed vulcanizing agent per 100 wt.h. rubber Strength at breakdown, kgf / cm (MPa) (GOST 270-64) 230 (23 Relative elongation,% (GOST 270-64) Residual elongation,% (GOST 270-64) 12 Hardness according to TM-2, unit. (GOST 263-53) 42 Elasticity by rebound,% (GOST 6950-54) 40 Heat aging coefficients (72 hours at 100 ° C, GOST 271-67) Kb .0.82 K & 0.90 Start time of vulcanization at 120 ° C, min (GOST 10722-64) 20 Example 4. Per 100 parts by weight of chloroprene rubber nairit Cr-50 is injected on a roller of parts by weight of the proposed vulcanizing agent 0.5 parts by weight of stearic acid. Rubber properties per . The basis of the chloroprene Chaika nairit Kr-50 containing 40 parts by weight of vulcanizing agent applied by weight of rubber Strength at break, kgf / cm (MPa) (GOST 270-64) 250 (25) Relative elongation,% (GOST 270-64) 850. Residual elongation,% (GOST 270-64). 12 Hardness according to TM-2, units (GOST 263-53) 46 Rebound elasticity,% (GOST 6950-54) 40 Thermal stare coefficients (72 h at 100 ° C, GOST 271 -67) KCJ0.88 Start time of scorch at 130 ° C, min (GOST 10722-64) .18 Example 5. Per 100 wt.h. chloroprenoo rubber nairit Kr-50 is introduced at 50 wt.h. proposed vulcanizing nta and 0.5 wt.h. stearic acid. Properties of rubber on the basis of chloroprene Chaika nairit KR-50, containing 50 wt.h. applied vulcanizing agent, wt.h. Rubber Tensile strength, at j rarefied, kts / cm (MPa) (GOST 270-64) 225 (22,5), Relative Elongation, 270-64) 800 Residual Elongation,% (GOST 270-64) 12 Hardness in TM- 2 units (GOST 263-53) 48. Rebound elasticity,% (GOST 6950-54) 40 Heat aging coefficient (72 hours at 00 ° C, GOST 271-67), 8 .90 Start time of scorching at 30 ° C, min (GOST 10722-64) 17 D Comparison shows the properties of rubber based on chloroprene rubber nanrite Cr-50, containing as a vulcanizing agent zinc oxide and magnesium, of the following composition, wt.h. Rubber100 Zinc oxide5 Magnesium oxide 7 Stearic acid 0.5 Strength at break, kgf / cm (MPa) (GOST 270-64) 240 (Elongation,% (GOST 270-64) 1000 Residual elongation,% (GOST 280-64) 16 Hardness according to TM-2 units (GOST 263-53) 45 Elasticity by rebound,% (GOST 6950-54) 40 Coefficients of heat aging (72 hours at 100 ° C, GOST 271-67) 6 Start time of scorching at 130 ° C, min (GOST 10722-64) 5 From the above examples it can be seen that, according to the invention, it is possible to obtain rubber with a high resistance to underside and thermal aging. Optimal content of portland cement in a rubber compound, it is 30–40 parts by weight, since a further decrease or increase in its amount leads to a physicist determining the mechanical properties of rubber. Claim of the invention A rubber mixture based on chloroprene rubber, including a vulcanizing agent, characterized in that the purpose of:: increasing the resistance of the mixture to scorching and improving the resistance to thermal aging of rubber from it, the mixture contains portland cement composition, wt.%, SiOi22 - 24 Af jOj5.5 - 6.3 RegOz .2,8 - 3, as a vulcanizing agent, 6 MgO0.1 - 2.5 SOj..2-3 Kg O0.4 - 0.7 SaODo 100 in amount ie 10-50 parts per 100 wt.h. rubber Sources of information taken into account during the examination 1. Handbook of rubberman, M., Himi, 1971, p. 89 (prototype).