SU1131888A1 - Rubber stock based on unsaturated rubber - Google Patents

Abstract

REZRSHOVAYA MIXTURE BASED NENASSCHENNOGO RUBBER comprising sulfur, tetramethylthiuram disulfide, di-phenyl guanidine, zinc oxide, stearin, petroleum asphalt, petrolatum wax alloy kaolin, carbon black and phenol-formaldehyde resin heat stabilizer, characterized in that, in order to increase the heat resistance when rubbers preserving the physicomechanical properties of rubbers, it contains, as a heat stabilizer, a trianilide phosphate with N, N-diphenyl-p-phenylenediamine at the following ratio of components, May, including: Unsaturated 100 rubber 0 , 2-0.4 Sulfur Tetramethylthiuram2, 0-3.0 Disulfide 0.8-1.2 Diphenylguanidine i 4.0-5.0 Zinc Oxide 2.5-3.5 Stearin 8.0-10.0 Bitumen Oil Paraffin alloy with 12.0-14.0 petrolatum 30.0-40.0 Kaolin Technical coal 70, 0-80.0 Genus Phenol formaldehyde-: d9 x 0.4-, 6 hydride resin Trianilidophosphate 0.5-1 ,five. X) N, I -Diphenyl 0.1-0.5-p-phenylenediamine

Description

. I1 The invention relates to the production of rubber based on unsaturated rubber, which can be used in the manufacture of rubber products, as well as in the tire and electrical industry. Known rubber compounds based on unsaturated rubber include N, N-diphenyl-p-phenylenediamine L1J or OO-diphenyldithiophosphate nickel 2j as a heat stabilizer. A disadvantage of known rubbers is their low heat resistance. The closest to the technical essence and the achieved result to the proposed is a rubber mixture based on unsaturated rubber, including sulfur, tetramethylthiuram, cisulfide, diphenylguanidine, zinc oxide, stearin, petroleum bitumen, paraffin-petrolatum alloy, kaolin, carbon black, phenol formaldehyde, and temmethyl. and heat stabilizer phenyl-A-naphthylamine h. However, rubber from such a mixture has insufficient heat resistance. Due to the high toxicity of phenyl-B-naphtylamine and its decomposition products, released during the vulcanization of rubber compounds and rubbers during their operation, its use is limited. In addition, phenyl-α-naphthylamine has a strong effect on discoloration of white and colored rubber. The purpose of the invention is to improve the heat resistance of rubber while retaining their original physical and mechanical properties. The goal is achieved by the fact that a rubber mixture based on unsaturated rubber, including sulfur, tetramethylthiuram disulfide, diphenylguanidine, zinc oxide, stearin, petroleum bitumen, petroleum alloy, petrol resin, and petrol resin. , carbon black, phenol-formaldehyde resin and heat stabilizer, as a residue, contains trianilide phosphate with N, N-diphenyl-p-phenylenediamine in the following ratio of components, m.h „: Unsaturated 100% rubber Sulfur 0.2-0.4 Tetramethylthiuram2, 0-3.0 disulfide. 0.8-1.2 Diphenylguanidium 4.0-5.0 Zinc Oxide 2.5-3.5 Stearin 8 Petroleum bitumen 8.0-10.0 Paraffin-petrolatum alloy 12.0-14.0 Kaolin 30.0 -40.0 Carbon Black 70, 0-80.0 Phenol-Formaldehyde Resin 0.4-0.6 Trianilide Phosphate 0.5-1.5 N, N -Diphenyl-p-Phenylenediamine 0.1-0.5 Trianilide Phosphate is a solid white crystalline substance with so pl. 215 C. Trianilide phosphate is obtained in a known manner 4, it is practically non-toxic 5, unknown as a stabilizer. N, N-Diphenyl-p-phenylenediamine is a dark gray powder with m.p. 152 ° C. Both compounds dissolve well in basic organic solvents, are stable during long-term storage, and do not cause vulcanisation of rubber compounds during their manufacture and storage. The method of their preparation is simple, does not require a deficient and special equipment. Trianilide phosphate can be stored for a long time without changing its properties. The optimal dosages of stabilizers are 0.5-1.5 mash. trianilide phosphate and 0.1-0.5 ma.ch. N, N-biphenyl-p-phenylenediamine. The use of stabilizers in smaller dosages does not lead to a positive effect, and an increase in dosages in excess of those suggested is not practical from an economic point of view. In the proposed rubber compositions, unsaturated rubbers are used: polyisoprene, styrene butadiene, polybutadiene, or mixtures thereof. The remaining components of the rubber mixtures are commonly used in the preparation of cable rubbers. The evaluation of the properties of vulcanizates is carried out according to the physicomechanical characteristics before and after thermal aging according to GOST 270-75, GOST 9.24-74. Examples 1-5. Rubber composites based on a mixture of unsaturated rubbers are prepared on rollers at a temperature of rolls. The resulting com-. the positions are vulcanized in an electric press for 30 minutes at 143 ° C.

The composition of rubber mixtures are given in table 1, the properties of vulcanizates - in table 2. For comparison, the properties of the prototype composition containing phenyl-naphthylamine as a heat stabilizer are given.

The results of the long-term thermal aging of rubbers at 100 ° C for 20-120 days are presented in Table 3.

Examples 6-8. Rubber compositions based on the combination of rubber SKS-30, ARKM-15, SKD and SKI-ZD with different quantitative content of the components of the mixture are prepared analogously to example 1.

The composition of the compositions is given in table.4. The properties of the vulcanizates depending on the content of the components in rubber mixtures are presented in Table 5. Examples 9-10. Rubber compositions based on butadiene rubber SKD and. isoprene rubber SKI-ZD is prepared analogously to example 1. The compositions of the mixtures are given in table 6.

The properties of the vulcanizates are presented in table.7.

The data presented in the tables indicate that rubber from the proposed rubber mixture based on unsaturated rubber, including a trialkyl phosphate in combination with N, N-diphenyl-p-phenylenediamine as a heat stabilizer, have a higher thermal stability (they retain their elastic properties better thermal aging) as compared with known rubber, and the physical and mechanical properties of rubber before aging are identical to those of known rubber.

It should be noted (Table 3) that the thermostabilizing effect of the proposed stabilizer system is most pronounced during prolonged thermal aging.

Thus, the proposed rubber mixtures can improve the performance of rubber produced from them by increasing thermal stability by maintaining the elastic properties of rubber during aging.

Table 1

Trianilide phosphate

N, N-diphenyl-p-phenylenediamine

Neozon D (feNSh1-0 naphthylamine)

O, O-Differ ildithio nickel phosphate

1.0

0.3

1.0

1.0

PP softener - paraffin-petrolatum alloy in the ratio of 70:30. Resin - phenol-formaldehyde nal sm; la.

Continuation of table 1

aging

100 ° - 20 days: K, (by strength) 1.11 Cl (according to, 0.79 0.91 2Q extensions) 100 ° C –40 days: K ((by the end, 94 1.04 ness) K2 (with respect to, 73, 0.88 sieves.)

K2 (relative to, 60 0.72 sieves.) 100 s-100 days: K, (in terms of strength) 0.89 0.92 Kg (relative to 0.50 0.70 100 C120 days: to, (( on durable.) 0.91 0.90 K2 (according to, 0.42 0.68 udl.)

Tensile strength

MPa

Relative extension

gap,%

Residual elongation,%

Thermal aging coefficients

100 ° - 20 days K (for strength)

K- (by att.)

100 ° 40 days

K, (by strength)

C (by attributed, udl.)

100 ° - 60 days

K ((by strength)

To (by attributed.)

Continuation of table 4

7.60

482 22

1.08

0.92

1.05 0.89

0.98 0.75 Technical carbon Pga-Z380.0 80.0 80 Phenol-formaldehyde resin grade SF-010A0.5 Trianyl 1shthophosphate 1,5 N, N-biphenyl-p-phenylenediamine 0, 2 Neozon D 0,0-diphenyldithiophosphate Table 6

Offered

Name of indicators of the mixture according to examples Strength at stretching 5 MPa Relative elongation at break ,; % Residual elongation,% Coefficient of thermal aging 100 ° - 10 days: K (for strength) Kn (relative rel. UDL.) 100 °. 40 days: .K. (strength) CP. (by attributes, UDL.) 100 ° - 60 days. To (by strength) Krt (by relation. UDL,)

Table 7

Control

Claims (1)

RUBBER MIXTURE BASED ON UNSATURATED RUBBER, including sulfur, tetramethylthiuram disulfide, diphenylguanidine, zinc oxide, stearin, petroleum bitumen, paraffin alloy with petrolatum j kaolin, carbon black with thermal stability, thermal stability and thermal stability preserving the physical and mechanical properties of rubbers, it contains trianilidophosphate with Ν, Ν-diphenyl-p-phenylenediamine as thermostabilizer in the following ratio of components, parts by weight: Desaturated rubber 100 Sulfur 0.2-0.4 Tetramethylthiuram- disulfide 2.0-3.0 Diphenylguanidine _ 0.8-1.2 Zinc oxide 4.0-5.0 Stearin 2.5-3.5 Oil bitumen 8.0-10.0 Paraffin Alloy petrolatum 12.0-14.0 Kaolin 30,0-40,0 Technical coal kind . 70.0-80.0 Phenol formalde hydraulic resin 0.4-6), 6 Trianilido phosphate 0.5-1.5. N, 11-Diphenyl- p-phenylenediamine 0.1-0.5 eo 00 1 1131888