SU755812A1 - Synthetic rubber-based rubber mixture - Google Patents

Description

The invention relates to the production of rubber mixtures based on synthetic rubbers. ·

The widespread use of synthetic rubbers for the manufacture of various products, their role in the development of the national economy and indispensability in those areas where their specific properties (elasticity, strength, hardness) are necessary have made rubbers one of the most important materials,

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determining technological progress, many. Industries.

However, high elasticity, strength, hardness, dynamic

5 endurance is not enough. At the same time, it is necessary for the rubbers to have good technological properties, and for volcanic eats to have increased heat resistance.

The known composition of rubber mixtures. On the basis of synthetic rubbers with

the use of oligoethylacrylates of the general formula [1].

(CH _2. (X'1c-soo _{; n} . „ _Χ “ ^ - - (ss ^ yar ^ so-s - ch ₂ )

η is the number of hydroxyl groups; w — degree of polymerization of oligo-20

ether ·

X - H, CH _E , halogen,

K - the residue of glycol or polyol)

S) is the residue of a fatty or aromatic dibasic acid. 25

The resulting volcanic eats are characterized by better processability, high resistance to dynamic loads, and increased hardness. However, modified rubber compounds ₁

in a known manner, have not enough high resistance to premature vulcanization.

In the rubber industry, in the vulcanization of mixtures based on synthetic rubbers, anti-scorching is widely used, for example, highly effective α-nitroeodiphenylamine, hydroquinone [21.

However, in rubber compounds, it dramatically slows the rate of vulcanization.

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. 755312

The aim of the invention is to increase the resistance to podvuyskanization '.

The goal is achieved by the fact that a rubber mixture containing oligoester acrylates contains hydroquinone in combination with phenyl-p-naphthylamine and a compound of the general formula

where K is phenyl, naphthyl, propyl, ethyl, methyl.

The data in Tables 1-3 show the maximum, minimum, average dosages of the proposed compounds. The data in the tables show that only the joint use of the three proposed compounds gives a new qualitative effect: an increase in the resistance to premature vulcanization, without a decrease, and in some cases with an improvement in the rubber indices. The introduction of their proposed compounds in a rubber, a zine mixture is made on conventional equipment using conventional methods.

Table 1 shows the properties of mixtures and vulcanizates. Investigated · pe4

target: SKN-26 - 100; zinc oxide - 5; carbon black DG-100 - 50; oligoether 10; dicumyl peroxide - 0.5.

Table 2 shows the properties of mixtures and vulcanizates. Recipe: SKN-26 - 100; zinc oxide -5; Dicut5 Mila peroxide - 0.5; carbon black DG-100 - 50; oligoester acrylate - 10. In addition, the data on the resistance to scorching of the proposed and known compositions are given, and the amounts of anti-scorching are the same.

Table 3 shows the composition and properties of the vulcanizates. The recipe under study: SCM - 30 ARKM - 15 - 100.0;

stearic acid —1,0; zinc oxide - 5.0; oligoester acrylate - 30; Soot PI-70 - 60.0; dicumyl peroxide - 0.8; phenyl-p-naphthylamine - 0.5.

V. tab. 4 shows the composition and svo-. 20 properties of vulcanizates. Investigated recipe: SKMS-30 ARKI-15-100; carbon black DG-100 - 40; zinc oxide - 5.0;

phenyl- (1 naphthylamine - 0.5} hydroquinone - 0.5; oligoester acrylate - 10; dicumyl peroxide - 0.7.

Table!

Antiskorching and indicators Cipher salts and dosage, weight.h one 2 3 four ⁵ | ⁶ 7 eight 9 ten eleven Μ, Ν * di (1.4 methylethyl) Phenylende- amine 0.15 1.0 4.0 1.5 1.5. - 1.5 · - 1.5 - Hydroquinone 1.0 0.1 • 0.01 0.2 0.2 - - 0.2 0, - Phenyl [b-naphthylamine 0.7 0.5 0.3 0.5 - 0,5 0.5 0.5

Mooney vulcanisation time, T ₅ ,

at 120 °, min. 20 22 20 25 ten eight ten ten . ιό ten ten AT optimum vulcanization 14 3 ° x 30 min Strength, kgf / cm ² 300 300 300 300 300 300 300 290 290 290 290 Relative extension, % 550 550 550 560 560 .550 570 560 570 550 560 Residual elongation,% 7 ten 12 eight eight 12 12 12 12 12 12

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Continued table. one.

Antiskorchin- | Codes of salts and dosage, parts by weight

g and i indicators | one 2 3 four five b 7 eight 9 ten eleven one-

Hardness TM-2, units 72 71 70 70 73 74 72 70 72 71 72 After vulcanization 143 ° * 70 min Strength, kgf / cm ² 300 300 300 300 300 300 · 300 300 290 290 290

Note. Mixtures of the cipher 5-11 - control

table 2

Anti-scorching

indicators

Dosage,

weight.h.

Ν-φΟΗΗΠ-Ν ' ^ί -isopropyl-η-phenylenediamine Hydroquinone 1.5 0.2 2.2 2.2  - 1.5 0.7 1.5 1.5 0.7 Phenyl-p-naphthylamine 0.5 - - 2.2 • 0.7 0.7 1.5 Mooney scorch time, 120 °, min 22 eight ten ten ten ten ten eight Vulcanization 14 3 ° 30 m Strength, kgf / cm ² 300 290 250 290 270 290 270 270 Relative extension,% 550 560 520 540 530 540 560 560 Residual extension,% 12 12 ten 12 ten ten ten ten

• Table 3

Anti Scorching and indicators Dosage, weight. % on rubber Ν-profile-N ¹ phenyl-η-phenylenediamine 0.3 0.6 1.0 2.0 4.0 - 2.0 - Hydroquinone 0.03 0.06 0.1 1.0 0.5 1.0 Resistance to 1 scorch (T $) at 120 ^ 0, min 32 32 35 38 40 sixteen' 15 ' 15

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Antiskorching and indicators

Dosage wt.% Rubber

- ^. Continuation of the table?

At optimum vulcanization 150 ° * 30 °

Tear resistance,

kgf / cm ² 220.0 210.0 225.0 230.0 210.0 200.0 210.0 200.0 Relative extension, % 540 570 580. 560 550 560 550 540 Residual elongation,% 10.0 16,0 18.0 12.0 14.0 10.0 14.0 10.0

Thermal coefficient

aging in the air

at 120 ° for

3 days of strength 0.67 0.70 0.76 0.80 0.74 0.57 0.58 0.5

Table 4

Name indicator Name and dosage for rubber additives wt.% ' N-naphthyl-Ν-propyl-p-phenylenediamine- Scorch time (T ₅ 1 Mooney at 120 °, min. 14 34 At optimum vulcanization 143 ° * 60 min Strength, kgf / cm ² 300 ³¹⁰ Same with 100 ° 70 75 Same after aging 100 ** 3 days. 180 190 ' Relative extension,% 700 690 Residual elongation,% 14 14 Elasticity,% 38 40 Brittleness temperature, ° С -55 -55 Resistance to the growth of cracks, thous. ' thirty 34

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Claims (1)

Claim ζ Rubber compound based on synthetic rubbers, including anti-scorching-Phenyl-^ -naphthylamine oligoester acrylate, characterized in that, in order to increase the resistance to vulcanization, the rubber mixture additionally contains hydroquinone and the compound of the following general formula H where K is methyl, ethyl, propyl, phenyl, naphthyl, in the ratio of mixture components,) 5 weight.h · Rubber 100 OligoeFiracrylate 3-30 Hydroquinone 0.01-1.0 Phenyl-β-naphtylamine 0.3-0.7 The compound of the formula 0.15-4.0