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Method for preparing copolymer chlorohydrin rubber by precipitation polymerization

A chlorohydrin rubber and precipitation polymerization technology, applied in the field of chlorohydrin rubber, can solve the problems of unsatisfactory production cost of chlorohydrin rubber, and achieve the effects of excellent mechanical properties, beautiful appearance and strong practicability

Inactive Publication Date: 2012-10-17
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chlorohydrin rubber produced in this way is not ideal in terms of product appearance, mechanical properties, etc., or the production cost of chlorohydrin rubber.

Method used

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  • Method for preparing copolymer chlorohydrin rubber by precipitation polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix 65 parts by volume of petroleum ether, 12 parts by volume of a mixture of epichlorohydrin and ethylene oxide, and 2.8 parts by volume of catalyst, and react at 70°C under nitrogen atmosphere After 3 hours, the heating reaction was stopped, and after cooling with cold water, the solvent was vacuumed to obtain an elastomer, and vacuum-dried at 50° C. to obtain a pale yellow to light white granular homopolychlorohydrin rubber 1. The volume of epichlorohydrin is 8 parts, and the volume of ethylene oxide is 4 parts. The catalyst is triisobutylaluminum, phosphoric acid and N,N-dimethylaniline in a volume ratio of 100:200:16. The intrinsic viscosity [η] of the homopolychlorohydrin rubber 1 is 0.2734; the viscosity-average molecular weight of the product is M η is 75988.

Embodiment 2

[0017] Mix 10 parts by volume of n-heptane, 5 parts by volume of a mixture of epichlorohydrin and ethylene oxide, and 1 part by volume of a catalyst, under a nitrogen atmosphere at 50°C After reacting for 1 hour, the heating reaction was stopped, and after cooling with cold water, the solvent was vacuumed out to obtain an elastomer, and vacuum-dried at 55° C. to obtain a slightly yellow to light white granular homopolychlorohydrin rubber 2. The volume of epichlorohydrin is 2.8 parts, and the volume of ethylene oxide is 2.2 parts. The catalyst is triisobutylaluminum, phosphoric acid and N,N-dimethylaniline in a volume ratio of 80:200:24.

Embodiment 3

[0019] Mix 70 parts by volume of n-hexane, 16 parts by volume of a mixture of epichlorohydrin and ethylene oxide, and 5 parts by volume of catalyst, and react at 80°C under nitrogen atmosphere After 5 hours, the heating reaction was stopped, and after cooling with cold water, the solvent was vacuumed out to obtain an elastomer, and vacuum-dried at 60° C. to obtain a slightly yellow to light white granular homopolychlorohydrin rubber 3. The volume of epichlorohydrin is 10 parts, and the volume of ethylene oxide is 6 parts. The catalyst is triisobutylaluminum, phosphoric acid and N,N-dimethylaniline in a volume ratio of 100:160:12.

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Abstract

The invention discloses a method for preparing copolymer chlorohydrin rubber by precipitation polymerization, Comprising the following steps of: mixing 10-70 parts by volume of a low polar organic solvent, 5-16 parts by volume of a mixture of chloropropylene oxide and oxirane and 1-5 parts by volume of a catalyst, reacting at 50-80 DEG C for 1-5 hours, and carrying out separation and purification to obtain the copolymer chlorohydrin rubber, wherein the volume ratio of chloropropylene oxide to oxirane is 8-10:4-6. The preparation process provided by the invention is simple and requires low cost. The product prepared by the preparation process has advantages of beautiful appearance, excellent mechanical properties and strong practicality.

Description

technical field [0001] The invention belongs to the field of chlorohydrin rubber, and specifically relates to a method for preparing copolymerized chlorohydrin rubber by precipitation polymerization. Background technique [0002] Co-homopolymer chlorohydrin rubber is a synthetic rubber obtained by ring-opening copolymerization of epichlorohydrin and ethylene oxide. It is a special rubber with oil resistance, heat resistance and low air permeability. Although the low-temperature flexibility of the copolymerized chlorohydrin rubber is improved, the air tightness is decreased. Homopolymeric chlorohydrin rubber is mainly used to make various oil-resistant seals, diaphragms, adhesives and Freon-resistant hoses; copolymerized chlorohydrin rubber is used in fuel oil drums in cold regions, parts of automobile operating oil systems, cable jackets, various Mechanical seals and oil-resistant rubber products, etc. Because there is no double bond in the molecular chain of chlorohydrin ...

Claims

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Application Information

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IPC IPC(8): C08G65/24C08G65/08
Inventor 胡思前
Owner JIANGHAN UNIVERSITY
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