SU732318A1 - Chloroprene rubber-based rubber mixture - Google Patents

Description

The invention relates to the field of rubber technology and can be used in the rubber industry, in particular, in the manufacture of cured and heat resistant rubber. A known rubber blend based on chloroprene rubber, containing a vulcanizing agent and commonly used ingredients are softeners, etc. - with oxides of zinc and magnesium as a vulcanizing agent 1. But this mixture does not possess sufficiently high resistance to scorching and heat aging, as well as a large accumulation of residual deformation under compression, which limits its scope. The purpose of the invention is to increase the resistance of rubber to underwater capillary and thermal aging, to reduce the accumulation of permanent deformation, and also to reduce the cost of rubber by eliminating expensive ingredients from their composition. This goal is achieved by the fact that the rubber mixture and the basis of chloroрен urenic rubber as a wok agent contain shale ash in the amount of 10-50 mass parts. per 100 wt.h. rubber Ash is formed by burning of Baltic shale in furnaces of boilers and furnaces of thermal power plants. The ash content during combustion is 943%, the content of conditional organic matter is 4-8%. Ash is a light yellow powder with a particle size of less than 40 microns. The composition of the ash includes t, wt.%: SiOj30 - 40 A gOe5 - 10 RegOz5-10 30 - 50 CaO 2-5 MgO 5-10 50 C Table. 1 shows the physico-chemical properties of ash shale. 1 a b l and c a I Indicators Size Moisture content,% pH of water extraction Indicators Specific adsorption surface, m / g13.4 Oil number (ml dibutylphalate per 100 g of ash) 20.0 Content of acetone extract,% 0, 6 Specific weight, kg / m 2740 Bulk weight, g / l880 The rubber mixture may contain the ingredients commonly used in rubber technology: plasticizers, fillers, etc. Rubber mixtures are made 20 on a laboratory roller in one stage. The rubber compounds obtained are vulcanized in a press at 143 + 0.5 ° C for 20 minutes. Example 1. At 100.0 wt.h. of chloroprime rubber Nairit Kr-50 is introduced on the rolls of 10 mass.h. ash slate and 0.5 wt.h. stearic acid. In tab. 2 shows the properties of the vulcanizates. Table 2 Compression of 20% for 120 hours at. Example 2. 100.0 wt.h. chloroprene rubber nairit Kr-50 enter 25

Compression of 20% for 120 h at 100 ° C.

Example 3. 100.0 wt.h. chloroprene rubber (width Cr-50 is introduced

on rolls ST), 0 wt.h. ash slate and 0.5 wt.h. stearic acid.

In tab. 4 shows the properties of the vulcanizates.

Table 4

Vulcanizate properties

i Test results 45 37323184 Continued table. 1 on rollers 20.0 mass. H. ash slate and 0.5 wt. h. , istaarinic acid. Vegschshna In table. 3 shows the properties of the vulcanizates. Table 3 Results Vulcanizate properties of tests Tensile strength at failure, kgf / cm Relative elongation,% Residual elongation,% Hardness according to TM-2, unit. Rebound elasticity,% Heat aging coefficients 72 hours at 100 ° C) - - K Residual Deformation,% Start time of scorching, at 130 ° C, min Strength at break, kgf / cm Elongation,% Residual elongation,% Hardness TI-2, units Rebound elasticity,% Heat aging coefficients (72 h ugH 100 ° C) 5 Continued from table. 4 Volcanic properties {shzatov Test results 732318 Continued table. 6 Vulcanizate Properties Test Results

Residual deformation,% Starting time of scorching at 130 ° C, min: Szh-gae 20% for 120 hours, chi-100 ° C. Example 4. 100.0 wt.h. chlorine of the new rubber nairit Kr-50 is introduced on the rollers 40.0 wt.h. ash slate and 0.5 wt.h. stearic acid. In tab. 5 shows the properties of the vulcanizate. Table 5 Result of the vulcanizates tested The tensile strength at break, kgf / cm Relative elongation,% Residual elongation,% Hardness of TM-2, units. Rebound elasticity,% Heat aging coefficients (72 hours at 100 ° C) Residual strain,% Start time of scorching at 130 ° C, min. Compression 20% for 120 hours at 100 ° C. Example 5. 100 mass.h. chloroprene rubber nairit Kr-50, 50.0 wt.h. ash slate and 0.5 wt.h. stearic acid. In tab. 6 shows the properties of the nulcanizate. Table 6 Results Properties of the vuccanizates of tests Tensile strength; tn at break, kgf / cm Relative elongation, / Residual elongation,% TM-2 hardness, unit. Oggskoku elasticity,% Heat aging coefficients (72 hours at 100 ° C) Residual deformation,% Start time for curling at 130 ° C, min. Compression 20% for 120 hours at 100 ° C. Example 6. 100.0 wt.h. chloroprene rubber nairit Kr-50 is introduced on the rollers 30.0 wt.h. ash slate, 0.5 wt.h. stearic acid and 40.0 wt.h. carbon black PM-15. In tab. 7 shows the properties of the vulcanizates. Table 7 Results Vulcanizate properties of tests Tensile strength at break, kgf / cm Relative elongation,% Residual elongation,% Hardness in TM-2, units. Rebound elasticity,% Heat aging coefficients (72 hours at 100 ° C), sufficient deformation,% rem start of vulcanisation, ri 130 ° C, min. Compression 20% for 120 hours at 100 ° C.

 For comparison, table. 8 shows the properties of the rubber-filled and carbon-filled PM-15 rubber based on chloroprene rubber Nairit Kr-50, containing as a vulcanizing agent zinc oxide and magnet, of the following composition, mass: rubber - W0,0, zinc oxide - 5,0 , magnesium oxide 7.0 stearic acid - 0.5; filler 40, 0.

Table 8 Tensile strength at break, kgf / cm Relative elongation,% Residual elongation,% Hardness according to TM-2, units. Rebound elasticity,% Heat aging coefficients K (72 h at 100 ° C) K Residual deformation The start time of scorch at 130 ° C, min. Thus, it is necessary to obtain rubber with high vulcanization and heat

323188

 with less accumulation of residual strain. The optimum content of ash, slugcha and rubber mixture is 30-40 wt .h. since a further decrease or increase in the amount of shale ash leads to a decrease in the physicomechanical properties of rubber.

The use of shale ash as a vulcanizing agent can have a significant economic effect, since its cost is small compared to the cost of oxides. Formula of the invention Rubber compound based on chloroprene rubber, including a vulcanizing agent, is different in that, in order to increase the resistance of rubber to vulcanisation and heat aging, to reduce the accumulation of residual deformation, as a vulcanizing agent, the mixture contains 100 mass.h. rubber 10-50 mass.h. ash of oil shale, including, wt.%: SiOz30-40 A ZOz5-10 ReaOz5-10 CaO 30-50 MgO 2-5 50z5 - 10 Sources of information taken into account during the examination 1. Reference book of rubberman. M., Himi, 1971, p. 111 (prototype).

Claims (1)

Claim A rubber mixture based on chloroprene rubber, including a vulcanizing agent, characterized in that, in order to increase the resistance of rubber to scorch and heat aging, to reduce the accumulation of residual deformation, the mixture contains 100 parts by weight of a vulcanizing agent. rubber 10-50 parts by weight ash of oil shale, including, wt.%: SiOj ³⁰ - 40 A 2θ3 3 - 10 Re ₂ 0z 5 - 10 CaO thirty - fifty MdO _# 2 - 5 SO ₃ 5 - 10