Method for preparing chlorinated polyethylene by aqueous phase suspension method

A chlorinated polyethylene, water-phase suspension technology, applied in the direction of hypochlorous acid, hypochlorite, etc., can solve the problems of ineffective utilization, corrosion of the reactor, waste of resources, etc., and achieve high temperature and short chlorination time. , the effect of improving product yield and quality

Inactive Publication Date: 2009-12-23
ZIBO JIWEIZE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main disadvantages are: 1) a large amount of waste water containing dilute hydrochloric acid cannot be effectively utilized, but is diluted and discharged with lime and stones, which wastes resources and pollutes the environment; 2) the reaction kettle is severely corroded

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0027] 1) Raw material ratio: the chlorination process adds raw materials as shown in the following table:

[0028] Unit: Kg

[0029] Example 1

Example 2

Example 3

process water

3000

3000

3000

polyethylene

540

600

690

Chlorine

690

700

750

Dibenzoyl peroxide

1.2

1.5

1.8

Sodium Polymethacrylate

10.5

12

13.5

[0030] 2) Process

[0031] A. Chlorination process

[0032] Clean the chlorination kettle, add process water (tap water or demineralized water), dibenzoyl peroxide, and sodium polymethacrylate according to the dosage in the ingredient list, stir for 15-20 minutes, then add polyethylene, and slowly heat up to 70°C , the heating time is 1.5h; at a temperature of 70-110°C, feed 40% of the total amount of chlorine gas, and the pressure is less than 0.25NPa; After the chlorine flow is completed, the pressure is less than 0.36 NPa; at a temperature...

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PUM

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Abstract

The invention relates to a method for preparing chlorinated polyethylene by an aqueous phase suspension method and belongs to the technical field of ethylene homopolymers or copolymers. The method comprises chlorination and neutralization and is characterized in that: a chlorination working procedure comprises a three-section type chlorine introduction and reaction step: in the first section: chlorine accounting for 40 percent of the total quantity is introduced at a temperature of between 70 and 110 DEG C; after chlorine conduction is finished, the pressure is less than 0.25 NPa; in the second section: the chlorine accounting for 20 percent of the total quantity is introduced at the temperature of between 110 and 135 DEG C; after the chlorine conduction is finished, the pressure is less than 0.36 NPa; in the third section: the chlorine accounting for 40 percent of the total quantity is introduced at the temperature of between 135 and 142 DEG C; after the chlorine conduction is finished, the pressure is less than 0.45 NPa; the heat insulation temperature in a neutralization working procedure is between 80 and 90 DEG C; and the time of heat insulation reaction is between 6 and 8 hours. The method has a reasonable process, early chlorine conduction time and high pressure and improves the yield and quality of products.

Description

technical field [0001] The invention belongs to the technical field of ethylene homopolymers or copolymers, and in particular relates to a method for preparing chlorinated polyethylene by an aqueous phase suspension method. Background technique [0002] Chlorinated polyethylene (CPE for short) is a polymer synthetic material obtained by chlorination modification of polyethylene (generally high-density polyethylene, low-density polyethylene, and linear low-density polyethylene). Different, can be divided into plastic CPE (chlorine content 15%), elastic CPE (16-20%), elastomer CPE (25-50%), hard CPE (51-60%) and high elastic CPE. The chlorine content of commercial CPE is generally 30-40%, and its performance is similar to rubber; if the chlorine content is less than 30%, its performance is close to polyethylene; if the chlorine content is higher than 40%, its performance is close to polyvinyl chloride. [0003] Chlorinated polyethylene has the advantages of heat resistance, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/22C08F110/02C01B11/06
Inventor 石广军张群明王树斌蔡华廷孙守文
Owner ZIBO JIWEIZE CHEM
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