SU907026A1 - Vulcanazable rubber stock - Google Patents

Description

(54) VOLKANIZABLE RUBBER MIXTURE

I

The invention relates to the rubber industry and concerns the development of vulcanizable rubber compounds.

A vulcanizable rubber compound is known, including crushed coarse vulcanate with a particle size of up to 1 mm 1.

In particular, this ground volcanic acid is known as low-grade polymer filler.

Closest to the proposed technical solution is a vulcanizable rubber compound based on unsaturated rubber, including crushed vulcanizer 2.

However, the known mixture does not provide an increase in the strength and performance properties of rubber.

The purpose of the invention is to increase the strength and performance properties of rubber.

This goal is achieved by the fact that a vulcanizable rubber mixture based on unsaturated rubber, including crushed vulcanizer, additionally contains epoxidized 1,4 cy-polybutadiene of the general formula

t-CU -UH C4-CH ,, j-CH- & C-CH | x, 4

about

with a molecular weight of 15OO-ZOOOO and an epoxy content of 5-2 May. % when the ratio of components of the mixture, parts by weight: Unsaturated rubber 10O

Ground Vulcanizer 1O-15 Epoxidized 1,4V; and with polybutadiene 1,5-6

Example 1. A mixture is prepared on a laboratory roll mill in accordance with known technology; composition, parts by weight: styrene butadiene rubber 1OO (SKMSZOLRKM 15); stearin technical 2,0; zinc white 5, O; altax 1.5; diphenylguanidine 0.3; carbon black DG-i-lOO 50; sulfur 2, Oh. Instead of 15% by weight of the rubber mixture, a crushed vulcanizer with a particle size of 0.5 mm is introduced. As an epoxidized 1,4-i, it is used in a butadiene using a sample with a molecular weight of 150OO and an epoxy content of 10 May. %, which is introduced into the rubber mixture in the amount of 1.5 mas. For comparison, a control rubber mixture is prepared that includes all of the indicated components in the same ratios, with the exception of the epoxidized 1,4-cis-polybutadiene. The technical properties of rubbers based on SKMS-ZOARKM 15, containing crushed vulcanizer and epoxidized 1,4-and hp-polybutadiene, are presented in Table. 1. Example 2. Preparing a rubber mixture of a protecto-type on the basis of a combi-butadiene enamel styrene and butadiene rubber of the following composition, May. h .: SKMS-ZOARK 75; SKD 25 butadiene rubber; keozon t 1, O; phthalic anhydride O, 3; zinc white 3, O; oleic acid 2.0-, paraffin 0.9; microwax 1.0; rosin 1, O; inden-coumarone resin 2.0; oil PN-6 12.0; technical carbon PM-Yu 58; sulfenamide BT 1.4; sulfur 2.0. A 10% by weight rubber mixture was used to introduce a crushed vulcanizer with a particle size of 0.8 mm, obtained on the basis of recycled common rubbers and containing 1–15% by weight of unseparated fiber. As epoxidized l, 4-u, wc.polybutadiene, samples with a molecular weight of 17 5O and an epoxy content of 20% by weight are used, which are introduced in an amount of 2-6 wt.h. Rubber compounds are prepared in a known manner, for example by mixing on rollers or in a rubber mixer. When mixed on rollers, the epoxidized 1,4-qi-polybutadiene is introduced into the rubber mixture simultaneously with the ground volcanic eate within 3-5 minutes. Technical properties of protective rubber based on the ratio of SKMS-ZOARK: SKD 75:25, containing crushed vulcanizer and epoxidized 1,4-i, is. polybutadiene are given in Table. 2. Example 3. Preparing a rubber mixture of the tread type on a triple combination of rubber composition, wt.h .: SKMS-ZOARKM 15 50; SKD 30; SKI-3 20; zinc white 3.4; stearic acid 1.33; .mikrovosk 4,2; rosin 1, O5; inden-coumarone resin 2.1; oil PN-6 4,2; phthalic anhydride 0.52; product 4010 NA 1.05; neozon D 1, O5; Santoflex 1.21; technical carbon PM-100 65.7; sulfenamide.C 1.26; sulfur 1.68. Instead of 10% by weight of the rubber compound, a crushed vulcanizer with a particle size of 0.5 mm, obtained from recycled tire rubber, is introduced. A sample with a molecular weight of ZOOOO and an epoxy content of 8%, which is administered in an amount of 2 mph, is used as the oxidized 1,4-cis-polybutydiene. Rubber mixtures are prepared analogously to example 2. The technical properties of the tread rubber based on the combination SKMS-ZO ARKM15: SKD: isoprene rubber SKI-3) 50:30:20, containing crushed vulcanized material and epoxidized 1,4-cis-polybutadiene, are given in tab. 3. As follows from the examples given, the use of epoxidized 1,4-Qi poly-butadiene in rubbers with crushed vulcanizates improves the strength characteristics of vulcanizates, improves their fatigue endurance by multiple deflection and tensile deformations, and increases tear resistance and abrasion. With the introduction of the epoxidized 1,4cis-polybutadiene, the conditions for combining the crushed vulcanized rubber with rubber are improved and, after vulcanization, as a result of the interaction of epoxy groups with the ingredients of the rubber mixture on the one hand and with crushed vulcanized particles with the other respect of communications. All this has a positive effect on the strength and performance properties of rubber.

Indicators

Epoxidized 1,4-qi & m-polybutadiene, m at mol. mass 1BOOO, the content of epoxy1O wt.%

The duration of vulcanization at, min

Stress at 300% elongation, MPa Tensile strength, MPa Relative elongation at,% Residual elongation,% Tear resistance, kN / m

Heat aging coefficient (, 72 h)

tensile strength relative elongation

Fatigue endurance with multiple stretching (150% elongation, 250 rpm) cycles

Resistance to proliferation of cracks repeated repeated bending, cycles

Table I

The rubber mixture in the process of pulverized vulcanizate 15 May. h

Offered

Control

80 4.7 12.0 560

14

68

0.63 0.68

25650 2500O

Indicators

Epoxidated 1,4-cis.-polybutadone, wt.h.

(they say, the mass of ZOOOO, cx holding epoxy groups of 8%) 2, O

Duration of vulcanization at 143С, minO

Pressure at ZOO% elongation, MPa12.0

Strength at stretching, MPa15,2

Relative lengthening at bleeding,% 39О

Residual elongation,% S

Tear resistance, kN / m46

Fatigue endurance with repeated stretching {15% -. Elongation, 25 ° r / min)

cycles 4500

Resistance to the growth of cracks gfi

multiple bending, cycles63000

Abrasion on the device MIR-1

Claims (2)

(S 12%, F ZON), .57 Claims of the Invention A vulcanized rubber mixture based on unsaturated rubber, including a crushed vulcanizing agent, characterized in that, in order to improve the strength and performance properties of rubber from this mixture, the latter additionally contains epoxy doped 1, 4-cis-polybutadiene of the general formula -CH, -tH W- & Hj- -CH-C, H-CH-CHj. G a b p and c a 3 Rotate the mixture during the preservation of aluminum vulcanizate Yu May. h We offer 1 control thirty 11.5 14.0 370 ten 40 2750 412OO 62 with an ISOO-30000 molecular weight and an epoxy content of 5-20 wt.% With a ratio of mixture components, parts by weight. Unsaturated rubber100 Crushed vulcanized 20-ZO Epoxidized 1,4-cis-polybutadiene 1, 5-6 Sources of information that are taken into account when examining 1.Tugov I.I. Technology of substitutes for leather and technical fabrics. GOS INT And Light Industry, 1965, p. 60 2. The patent of Germany No. 2137891, cl. C 08L 9 / OO, 1978 (prototype).