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Method for preparing chlorinated maleic anhydride modified polyethylene material by using composite initiation system

A technology of acid anhydride modification and compound initiation, which is applied in the field of preparation of modified polyethylene, can solve problems such as difficulty in controlling the content of chlorine and maleic anhydride, difficulty in maintaining the initiation rate, single initiator, etc., and achieves reduced preparation costs and less pollution , Chlorine content controllable effect

Active Publication Date: 2019-10-18
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the currently known reports of maleic anhydride-modified polyethylene, the modification method is usually based on the preparation of chlorinated polyethylene, which requires at least two or more production steps, showing complex processes and difficult Disadvantages of Controlling Chlorine and Maleic Anhydride on Polyethylene
At the same time, the initiator used for modification is single, and it is difficult to maintain a stable initiation rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Under the condition of continuous stirring, disperse 300Kg polyethylene (particle size 80 mesh) in containing 3Kg emulsifier (weight ratio of ethylene oxide and propylene oxide 1:1 copolymer 2040 and polysodium methacrylate is 1:1) , 2Kg castor oil and ethylene oxide condensation product BY140 and 4000Kg water reactor, let polyethylene be in suspension state, add 2Kg composite initiator (dicumyl peroxide: dibenzoyl peroxide: peroxide Di-tert-butyl=0.8:1:0.8), after adding 15Kg of maleic anhydride at 100°C, react for 1 hour, cool down to 60°C, feed 900Kg of chlorine gas, and continue to react for 6 hours. After the reaction is finished, feed air to drive away the unreacted chlorine in the reactor, and the chlorinated product can obtain about 55% (weight ratio) of chlorine content after washing out acid, neutralizing, dehydrating and drying. Chlorinated maleic anhydride modified polyethylene.

Embodiment 2

[0028] Under the condition of continuous stirring, 300Kg polyethylene (particle size 80 orders) is dispersed in the reactor containing 3Kg emulsifier (the weight ratio of 2040 and sodium polymethacrylate is 1:1), 2Kg BY140 and 4000Kg water, let Polyethylene is in a suspended state, add 3Kg composite initiator (dicumyl peroxide: dibenzoyl peroxide: di-tert-butyl peroxide=0.8:1:0.8), after adding 15Kg maleic anhydride at 100°C , reacted for 1h, lowered the temperature to 60°C, introduced 900Kg chlorine gas, and continued to react for 6h. After the reaction is finished, feed air to drive away unreacted chlorine in the reactor, and after the chlorination product is washed with water, deacidified, neutralized, dehydrated and dried, the chlorine content of about 58% (weight ratio) can be obtained. Chlorinated maleic anhydride modified polyethylene.

Embodiment 3

[0030] Under the condition of continuous stirring, 300Kg polyethylene (particle size 80 orders) is dispersed in the reactor containing 3Kg emulsifier (the weight ratio of 2040 and sodium polymethacrylate is 1:1), 2Kg BY140 and 4000Kg water, let Polyethylene is in a suspended state, add 3Kg composite initiator (dicumyl peroxide: dibenzoyl peroxide: di-tert-butyl peroxide=1:1:1), after adding 15Kg maleic anhydride at 100°C , reacted for 1h, lowered the temperature to 60°C, introduced 900Kg chlorine gas, and continued to react for 6h. After the reaction is finished, feed air to drive away the unreacted chlorine in the reactor, and the chlorinated product can obtain about 60% (weight ratio) of chlorine after acid washing, neutralization, dehydration and drying. Chlorinated maleic anhydride modified polyethylene.

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PUM

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Abstract

The invention discloses a method for preparing a chlorinated maleic anhydride modified polyethylene material by using a composite initiation system. The method comprises the steps that first, polyethylene is dispersed in a reaction kettle containing an emulsifier, a dispersant and water, polyethylene is suspended under the condition of continuous stirring, and a peroxide-based composite initiatoris added; a certain amount of maleic anhydride is added at a certain temperature, cooling is performed after reaction for a period of time, and a certain amount of chlorine gas is introduced to continue the chlorination reaction; and finally, a chlorinated product is subjected to deacidification by washing, neutralization, dehydration and drying to obtain chlorinated maleic anhydride modified polyethylene. The composite initiation system is used for improving the production efficiency.

Description

technical field [0001] The invention relates to a preparation method of modified polyethylene, in particular to a method for preparing chlorinated maleic anhydride modified polyethylene material by adopting a compound initiation system. Background technique [0002] The performance of chlorinated polyethylene (CPE) is determined by the chlorine content and its distribution on it. As the chlorine content increases, the glass transition temperature of CPE increases, and CPE with a chlorine content of 20%-70% (mass fraction) has industrial value. In addition, the performance of CPE is also related to the distribution of chlorine on its macromolecular chain. During the chlorination process, the reaction conditions and process determine the distribution of chlorine atoms on the CPE macromolecular chain. One is random uniform distribution, and the other is uneven block distribution. The random uniform distribution of chlorine on the macromolecular chain determines that the form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F222/06C08F8/22C08F4/34
CPCC08F4/34C08F8/22C08F255/02C08F222/06
Inventor 汪立波王立周永龙俞豪杰傅俊超
Owner ZHEJIANG UNIV
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