SU952899A1 - Composition based on unsaturated low-molecular rubber - Google Patents

Description

This invention relates to obtainable rubbers and reactive compositions and can be used in various technical fields; electronics and mechanical engineering, rubber technology, for the production of casting and impregnating compounds, sealing compounds, when it is necessary that the structuring should be carried out at low Q temperatures.

A vulcanizable low molecular weight rubber composition is known, including the p-hiyondi-quinolide ester. oxime and 2,4,6-trisubstituted phenol and, additionally, HPV, ethylene glycol 1- homopolymer of vinylglycidyl ether (p-vinyloxyethoxy-propenoxy-2, 3-vinylylox), which plays the role of a non-mi-20 plating plasticizer, and sulfur in Ratio, m. .: 100: 5: 2: 10 IOdnakno GPV insufficiently plasticizes the initial rubbers and vulcanizates of it have not high enough indicators of strength at break and relative elongation.

The aim of the invention is to reduce the viscosity of the composition and improve 30

strength and elastic properties of vulcanizates. (rubber) from this mixture.

This aim is achieved in that the composition based on a low molecular weight unsaturated rubber, comprising hinolidny ether and n-hinondioksima trizameschennog9 2,4,6-phenol (HEF), a plasticizer and sulfur - based polymer vinilglitskdilovogo ethylene glycol ester, a copolymer containing kachestveplastifikatora vinilglitsidilovogo ester ethylene glycol (vinylox), and propylene oxide with a molecular weight of 400-1000 with the following ratio of components, wt.h .:

Low Molecular Unsaturated Rubber 100 P-Quinone Dioxime Quinolid Ester and 2,4,6-Trisubstituted Phenol2-10 Sulfur1-4 Plasticizer 10-30

As a non-migrating plasticizer, a block or statistical copolymers of vinylglycidyl ether of ethylene glycol (vinylox) and propylene oxide of different composition (swap) of the general formula MO- (CH-CH, -0) - (CH2-CH-0); H 0-1CH2) are used , -OCH-CH2 where n 1-10, m: c 1-15, q 0.5-10. The content of winnlox in the copolymer can vary from 5 to 95% by weight, but preferably 40 to 80% by weight. The characteristics of the copolymers of vinylglycide of ether and propylene oxide are given in table. one. . Any low molecular weight unsaturated rubbers, such as polybutadiene, polyisoprene, etc., are used as the basis of the composition. The amount of HEF and sulfur depends on the desired degree of crosslinking, the nature of the vulcanizing agent, etc. Commonly used accelerators, activators and fillers are added to the composition. Example 1. Five mixtures based on low molecular weight rubber for cis-1,4-polybutadiene - {25pO (. 7500P) are prepared using different kinds of SVOP (Table 2) and the following ratios of reagents, May .ch .: Rubber HEF-1 (K-С (СН) h) For comparison, two control mixtures of the indicated composition are prepared: one without the addition of a SVOP, and the other with the introduction of HPV instead of the SVOP. The ingredients are mixed on a laboratory roll at room temperature during 15 min. The mixture is vacuumed for 2 hours at room temperature and a residual pressure of 2.5 mm Hg. Curing is carried out at 80 ° C, the curing time is controlled by the yield n plateau depending on the conditionally equilibrium module (URM) on the curing time. The number of swaps and HPW, the viscosity of the mixtures, the vulcanization time and the physicomechanical indicators of the vulcanizates are given in Table. 2. Example 2. Preparing mixtures based on low molecular weight cis-1,4-polybutadiene (7-500 Pa) with the use of SWAP of different composition Tl of structure (Table 3J) of the following composition, wt .: Rubber 100 HEF-12.5 Cera1 SWAP30 For comparison, a control mixture of the specified composition is prepared without the addition of SWAP. The mixture is prepared and vulcanized as in Example 1. The results are shown in Table 3. Example 3. Preparing mixtures on the basis of low molecular weight polyisoprene (iZjooc Pz) using: SWAP of different composition and structure table. 4) of the following composition, mac.: Rubber HEF-12.5 Sulfur1, SWOP20-30 For comparison, two control mixtures of the indicated e-taivea are prepared: one without the addition of the SVOP, the other with the addition of the LGW instead of the SWAP. The mixture is prepared and vulcanized as in Example 1. The results are shown in Table. 4. From table. 2-4, it is clear that a copolymer of vinylox and propylene oxide is a non-migrating plasticizer for unsaturated polyisoprene and cis-1, 4-polybutadiene. Introduction 30 weight.h. Vinylox copolymer and propylene oxide leads to a decrease in the viscosity of the rubber-plasticizer composition by a factor of 4 to 7 for d-liisoprene and polybutadiene, respectively. The introduction of HPV in the well-known: composition under the same conditions reduces the viscosity only by 2-3.5 times (tagg. 2 and 4). When curing plade; The modified rubber is observed to completely fill the plasticizer to the polymer network: the sol fraction fraction of the unplasticized and plasticized vulcanizate is the same, while its strength and elasticity are characteristic. The properties of the volcanic compounds are improving. The introduction of a copolymer of vinylglycidyl ether of ethylene glycol and oxide; propylene in a composition based on low molecular weight unsaturated rubbers, including HEF in combination with. Gray, allows to increase the strength of vulcanizates by 2-2.5 times while maintaining or increasing the relative elongation by 1.5 times.

Table 1

SWAP-1 (40%) SWAP-2 (40%) SWAP-3 (60%) swap-4 (60%) SWAP-5 (80%) 4.11

table 2

T. blitz 3

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A composition based on a non-molecular unsaturated rubber, including the quinolide ester of p-quinone dioxime and 2.4 b-trisubstituted phenol, sulfur, and a plasticizer — a polymer based on ethylene glycol vinyl glycidyl ether, which is composition and improvement of strength and elasticity; similar properties of vulcanizates from it, composition "as a plasticizer contains a copolymer of vinyl glycidyl ether of ethylene glycol and propylene oxide with a molecular weight of 4001,000 in the following ratio: greyentov, ma.ch ,: Table Low molecular weight unsaturated, rubber Quinol ether p-quinodioxime and 2,4,6-trisubstituted phenol Sulfur.. Plasticizer Sources of information taken into account in the examination 1. 4secondary certificate of the USSR No. 802319, cl. C 08 L 9/00, 1979 (prototype). ..I