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A kind of preparation method of chlorinated rubber

A technology of chlorinated rubber and chlorination reaction, applied in the field of preparation of chlorinated rubber, can solve the problems of uneven chlorination, low degree of chlorination, poor solubility, etc., and achieve good solubility, less insoluble particles and high transparency Effect

Active Publication Date: 2017-04-19
LINYI AOXING CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome defects such as uneven chlorination of products, low chlorination degree, poor product transparency and poor solubility in the existing preparation method of chlorinated rubber, and provide a chlorination uniformity high, chlorination degree Preparation method of chlorinated rubber with high product transparency and good solubility
Uneven chlorination will lead to poor transparency, poor solubility of insoluble particles, easy layering of products, etc., and the viscosity often does not meet the requirements
The chlorination of natural rubber is extraordinarily complex, including not only substitution reactions but also double bond addition reactions in isoprene units. The inventors discovered in their research that the chlorination of natural rubber can be achieved by adjusting the reaction temperature using high temperature- Low-temperature two-stage reaction is optimized, and the chlorination reaction with a suitable additive formula can solve the problem of long chlorination time and uneven chlorination of natural rubber in the aqueous phase method, thereby solving the problems of poor product transparency, poor solubility, and product layering And other issues

Method used

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  • A kind of preparation method of chlorinated rubber
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  • A kind of preparation method of chlorinated rubber

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of preparation method of chlorinated rubber, this preparation method comprises the following steps:

[0027] (1) Add 30Kg of natural rubber and 0.9Kg of polyethylene wax (the number average molecular weight is 3000) into the reaction kettle containing the reaction medium and auxiliary agents, stir for 20min, and compound the weight ratio of polyethylene to reaction medium and auxiliary agents 1:12:0.15, the reaction medium is 15% hydrochloric acid aqueous solution;

[0028] (2) Chlorine is added to the reactor to carry out a chlorination reaction to obtain the crude chlorinated rubber product. The conditions of the chlorination reaction include: first reacting at 93° C. for 2 hours, then cooling to 58° C. for 2.5 hours; in the chlorination reaction , the amount of chlorine gas introduced is 5 times the weight of natural rubber;

[0029] (3) The crude chlorinated rubber product obtained in step (2) is subjected to deacidification treatment, and the deacidificatio...

Embodiment 2

[0032] A kind of preparation method of chlorinated rubber, this preparation method comprises the following steps:

[0033] (1) Add 30Kg of natural rubber and 3Kg of polyethylene wax (number average molecular weight is 2500) into the reactor containing reaction medium and auxiliary agent, stir for 20min, the weight ratio of natural rubber to reaction medium and auxiliary agent is 1: 10:0.08, the reaction medium is 10% aqueous hydrochloric acid;

[0034] (2) Chlorine is added to the reactor to carry out a chlorination reaction to obtain the crude chlorinated rubber product. The conditions of the chlorination reaction include: first reacting at 95° C. for 3 hours, then cooling to 55° C. for 2 hours; in the chlorination reaction , the amount of chlorine gas introduced is 4 times of the weight of natural rubber;

[0035] (3) The crude chlorinated rubber product obtained in step (2) is subjected to deacidification treatment, and the deacidification treatment includes: transporting ...

Embodiment 3

[0038] A kind of preparation method of chlorinated rubber, this preparation method comprises the following steps:

[0039] (1) 30Kg of natural rubber and 1.5Kg of polyethylene wax (number average molecular weight is 3000) are added in the reactor that contains reaction medium and auxiliary agent, stir 20min, the weight ratio of natural rubber and reaction medium and auxiliary agent is 1 : 15: 0.02, the reaction medium is 15% aqueous hydrochloric acid;

[0040] (2) Chlorine is added to the reactor to carry out a chlorination reaction to obtain the crude chlorinated rubber product. The conditions of the chlorination reaction include: first reacting at 90° C. for 3 hours, then cooling to 60° C. for 3 hours; in the chlorination reaction , the amount of chlorine gas introduced is 6 times of the weight of natural rubber;

[0041] (3) The crude chlorinated rubber product obtained in step (2) is subjected to deacidification treatment, and the deacidification treatment includes: trans...

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Abstract

The invention discloses a preparation method of chlorinated rubber. The preparation method includes the steps that firstly, natural rubber is added into a reaction kettle containing reaction media and auxiliaries, stirring is performed for 10-20 min, the weight ratio of natural rubber to the reaction media and to the auxiliaries is 1: (10-15): (0.02-0.15), and the reaction media are a hydrochloric acid solution with the mass fraction being 10-15%; secondly, chlorine is added into the reaction kettle, a chlorination reaction is performed, a coarse chlorinated rubber product is obtained, and a chlorination reaction condition includes that firstly reaction is performed at 90-110 DEG C for 2-3 h, and then reaction is performed at 50-70 DEG C for 2-3 h; thirdly, the coarse chlorinated rubber product obtained in the second step is subjected to deacidifying treatment, and chlorinated rubber is obtained through drying. The chlorinated evenness degree is high, the chlorination degree is high, product transparency is high, and solubility is good.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a preparation method of chlorinated rubber. Background technique [0002] Chlorinated rubber is a kind of organic polymer chlorinated synthetic resin, which is made by reacting natural or synthetic rubber polyprene with chlorine gas. It is an important rubber derivative in the field of rubber. It has good molding and adhesion properties. , is an important film-forming base material for medium and high-grade paints. At present, the methods for producing chlorinated rubber include solid-phase method, emulsion method, carbon tetrachloride solvent method and water-phase method. Among them, the solid-phase method is to grind and mix natural rubber and sodium sulfate, and pass chlorine in a pressure reactor. Greening, but because the solid phase method cannot solve the problem of heat dissipation, the product has poor thermal stability, dark color, and cannot be applied in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/14
CPCC08C19/14
Inventor 陈子彦
Owner LINYI AOXING CHEM CO LTD
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