SU557585A1 - Process for preparing modified butyl rubber - Google Patents

Abstract

A method of producing a modified butyllag by grafting an alkyl of substituted aromatic compounds in a solvent medium in the presence of an initiator, characterized in that, in order to increase the unsaturation of butyl rubber and increase elasticity, 8–10% of the weight of a rubber will be used as alkenyl substituted aromatic compounds, 8 to 10% of its weight will be used to increase elasticity, and elasticity of elasticity will increase. formulas - CH2-CH = CH-CH3 "where AG is phenyl; tolyl; xylyl, and 1–2 wt.% by weight of rubber benzoyl peroxide is used as an in-line cyatopa. i (LS: l: l ^ sd eOSP

Description

Of course, the invention relates to the production of new polymeric materials by modifying the original elastomers to create structural materials in the tire and rubber industry.

There are known methods for producing modified butyl rubber by grafting xylene-substituted aromatic compounds in a solvent medium in the presence of an initiator, and styrene, methyl methacrylate 1 - 3Z is used as alkenyl-substituted aromatic compounds. A significant disadvantage of the resulting product is low resistance to tearing, easy polymerization, which leads to the formation of a branched product and contamination by its homopolymer. The product also has reduced elasticity and unsaturation.

The purpose of the invention is to increase the unsaturation of butyl rubber and increase elasticity.

For this, according to the proposed method, as alkenyl-substituted aromatic compounds, 8-10% by weight of rubber of hydrocarbons of general formula are used

At- - CHP - CH CH - CH

five

where Ar is phenyl, tolyl, xylyl.

These compounds are a clear liquid with a low specific odor and have the following physicochemical constants:

1.1-Phenyl-2-butene: t kip. 72 74/15 mmHg v .; p 1,5102;

 0.8839; a pier weight 129, 95% unsatisfactory.

2.l-Tolil-2-buten: tkin. 93 94/16 mm Hg v .; P 1.5120;

(20 0.8860-, mol. Weight 143, unsubstantiated 94%.

3.1- (p-Xylyl) -2-butene: 1 kip. 105107/15 mm Hg v .; p 1,5146;

cJ 0 0.895, mol. weight 159, unspecific 96%.

The presence of a double bond in 1-phenyl-2-butene, 1-tolyl-2-butene and 1- (i-xylyl -2-butene allows for the grafting of these compounds to butyl rubber.

The method consists in obtaining modified. Butyl rubber by grafting alkenyl-substituted aromatic compounds in a solvent medium in the presence of an initiator, and 8 10 wt.% Of aromatic hydrocarbons of the general formula are used as alkenyl-substituted aromatic compounds.

A (1 - CH2 - CH CH - CI-, where AH is phenyl; tolyl; xylyl, and as an initiator 1-2 wt.% Benzoyl peroxide ..

The process is carried out by mixing a solution of butyl rubber in a hydrocarbon solvent (benzene, heptane) with monomer 1, 2 or 3 in the presence of a peroxide initiator, components 5 are taken in the following ratio: 100 g of butyl rubber is dissolved in 500 ml of benzene and 12 are added with vigorous stirring. ml of the corresponding monomer 1, 2 and 3. Then, benzoyl peroxide is added to the JO mixture at a temperature of 70 - 80 ° C. (1.0 to 2% by weight of rubber) and react with stirring for 90 minutes. The reaction mass is treated with 500 ml of ethyl

j alcohol. The precipitated modified butyl rubber after washing is dried under vacuum at a temperature to constant weight. The uncertainty of the isolated from the solution and the dried butyl rubber rises from 1.6 to

0 2.4 - 2.6%.

An increase in the concentration of the corresponding monomer in the reaction mixture of VIEE 12 ml leads to a decrease in the strength characteristics of the target pro5 | duct. By reducing the content of the corresponding monomer below B in the reaction mixture, a decrease in the strength of the butyl rubber obtained is observed due to a decrease in the continuity of the grafted butyl rubber.

The introduction of less than 1% of the initiator (benzoyl peroxide) does not provide during the grafting reaction of the modified monomer to butyl rubber.

g When the content of benzoyl peroxide

above 2%, the process of butyl rubber destruction over the modification prevails.

Example 1. 100 g of butyl rubber are dissolved in 500 ml of benzene and, with thorough stirring, are added

0 10 ml of 1-phenyl-2-butene. Then benzoyl peroxide (1.5% by weight of rubber) is added to the mixture at t & temperature and stirred for 90 minutes, after which the reaction mass

5 is treated with alcohol. The precipitated modified butyl rubber after three times washing is dried under vacuum at a temperature to constant weight. Some characteristics of the product obtained are listed in Table. one.

EXAMPLE 2 100 g of butyl rubber are dissolved in 200 ml of benzene and 10 ml of 1-tolyl-2-butene is added with vigorous stirring. Then benzoyl peroxide (1.5% by weight of rubber) is added to the mixture at a temperature of 75 ° C. The reaction is carried out with stirring for 90 minutes. The reaction mass is treated with alcohol. The precipitated modified butyl rubber after three times washing is dried under vacuum at a temperature to constant weight. Some characteristics of the obtained product are given in table. one.

Example 3 100 g of butyl rubber are dissolved in 500 ml of benzene and 10 ml of 1- (p-xylyl) -2-butene is added with thorough stirring. Then benzoyl peroxide (1.5% by weight of rubber) is introduced into the mixture. The reaction is carried out with stirring for 90 minutes. The reaction mass is treated with alcohol. The precipitated modified butyl rubber after three times washing is dried under vacuum at 60 ° C to a constant weight.

Some characteristics of the obtained product are given in Table. one.

Physico-mechanical properties of vulcanizates of rubber mixtures based on modified butyl rubber are given in table. , for comparison, the properties of the vulcanizate obtained from the original butyl rubber with the characteristics shown in Table 1 are given.

As can be seen from the table. 1 and 2, the resulting modified butyl rubber has unsaturation, at 40 mol.%

10-greater than the amount of unsaturation of the original, as well as improved physicomechanical characteristics of vulcanizates based on it, which expands the possibility of using it in the cable and cable industry.

Table

Table 2

Claims (1)

METHOD FOR PRODUCING A MODIFIED BUTYL EAGEN by grafting alkenyl substituted aromatic compounds in a solvent in the presence of an initiator, which is important in that, in order to increase the unsaturation of butyl rubber and increase elasticity, 8 - 10 are used as alkenyl or substituted aromatic compounds % by weight of rubber of aromatic hydrocarbons of the General formula Up - CH ₂ —CH = CH — CH ₃ , where Ar is phenyl; tolyl; xylyl, and as an initiator used 1 to 2 wt.% Of the weight of the rubber of benzoyl peroxide. ω from.