A kind of preparation method of chlorinated polyethylene rubber

A technology of chlorinated polyethylene and polyethylene, applied in the field of rubber preparation, can solve the problems of increased cost, difficult to rationally utilize and handle, and the quality of chlorinated polyethylene cannot be guaranteed, saving time, complete dealkalization effect, and ensuring stability sexual effect

Active Publication Date: 2020-04-07
HANGZHOU KELI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the waste water generated in the process of this method still faces the problem that it is not easy to be rationally utilized and treated, and the quality of the final chlorinated polyethylene can not be guaranteed.
In addition, the installation of follow-up acid gas treatment equipment will virtually increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of chlorinated polyethylene rubber, comprising the following steps:

[0035] (1) Chlorination: Stir after adding 55 parts by weight polyethylene, 0.15 parts by weight gelatin, 0.1 parts by weight polyoxyethylene ether and 0.05 parts by weight dicumyl hydroperoxide in 500 parts by weight water, feed chlorine gas simultaneously and carry out Three-stage heating to obtain material A;

[0036] (2) deacidification, neutralization and dealkalization: the material A in the step (1) is sprayed with water or treatment liquid A on a belt vacuum filter to obtain material B; Spray neutralization on the belt vacuum filter to obtain material C; use water to spray and clean dealkalization on the belt vacuum filter to obtain material D;

[0037] (3) Centrifugation and drying: After the material D is centrifuged, it is transported to a fluidized bed dryer by wind force and dried under the conditions of a wind speed of 0.8m / s and a drying temperature of 100°C to obt...

Embodiment 2

[0046] A preparation method of chlorinated polyethylene rubber, comprising the following steps:

[0047] (1) Chlorination: stir after adding 70 parts by weight of polyethylene, 0.3 parts by weight of polyvinyl alcohol, 0.3 parts by weight of sodium dodecylbenzenesulfonate and 0.1 part by weight of cyclohexanone peroxide in 700 parts by weight of water, while passing Enter chlorine and carry out three-stage heating, obtain material A;

[0048] (2) deacidification, neutralization and dealkalization: the material A in the step (1) is sprayed with water or treatment liquid A on a belt vacuum filter to obtain material B; Spray neutralization on the belt vacuum filter to obtain material C; use water to spray and clean dealkalization on the belt vacuum filter to obtain material D;

[0049] (3) Centrifugation and drying: After the material D is centrifuged, it is transported to a fluidized bed dryer by wind force and dried under the conditions of a wind speed of 0.8m / s and a drying t...

Embodiment 3

[0058] A preparation method of chlorinated polyethylene rubber, comprising the following steps:

[0059] (1) Chlorination: After adding 60 parts by weight of polyethylene, 0.2 parts by weight of polyvinylpyrrolidone, 0.2 parts by weight of azobisisobutyronitrile and 0.08 parts by weight of ammonium persulfate into 600 parts by weight of water, stir, while feeding chlorine gas and carrying out Three-stage heating to obtain material A;

[0060] (2) deacidification, neutralization and dealkalization: the material A in the step (1) is sprayed with water or treatment liquid A on a belt vacuum filter to obtain material B; Spray neutralization on the belt vacuum filter to obtain material C; use water to spray and clean dealkalization on the belt vacuum filter to obtain material D;

[0061] (3) Centrifugation and drying: After the material D is centrifuged, it is transported to a fluidized bed dryer by wind force and dried under the conditions of a wind speed of 0.8m / s and a drying t...

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Abstract

The invention provides a method for preparing chlorinated polyethylene rubber and relates to the technical field of rubber preparation. A water phase suspension method is mainly adopted and includes the steps of chlorination, deacidification, neutralization, dealkalization, centrifugation, drying and the like. Short production cycle, less water consumption, low equipment requirement are achieved,the goal of environmental protection is realized, and the obtained chlorinated polyethylene rubber is stable in quality, high in chlorination degree and strong in tensile property. In the method, a belt filter is adopted in the steps of deacidification, neutralization and dealkalization, time for preparing chlorinated polyethylene by the water phase suspension method is shortened, and meanwhile, the effect of deacidification and dealkalization is more complete; in addition, waste liquid is neutralized by using shell as packing, so that low concentration waste acid / waste alkali produced by thewater phase suspension method can be reused, and the goal of environmental protection is achieved.

Description

technical field [0001] The invention relates to the technical field of rubber preparation, in particular to a preparation method of chlorinated polyethylene rubber. Background technique [0002] Chlorinated polyethylene is a polymer material made from high-density polyethylene through chlorination substitution reaction. It has excellent weather resistance, ozone resistance, chemical resistance, aging resistance, oil resistance, flame retardancy and coloring properties. According to Chlorine content and residual crystallinity can be divided into resin type chlorinated polyethylene and rubber type chlorinated polyethylene. The former has higher relative molecular weight, plasticizing temperature, melting temperature and mechanical strength, and is mainly used as a modifier for general-purpose resins such as PE, ABS and PP, while the latter has lower melt viscosity and plasticizing temperature, and moderate mechanical strength and softness , mainly used for special rubber. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F8/22
Inventor 张新江景伟刘刚刘毓红孙锦伟
Owner HANGZHOU KELI CHEM CO LTD
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