Chemical degradation method of polypropylene

A technology for chemical degradation of polypropylene, applied in the field of controlled degradation of polypropylene, which can solve the problems of acid sensitivity, large residual groups, and high price, and achieve the effects of improving molecular weight distribution, increasing melt index, and improving degradation efficiency

Active Publication Date: 2008-04-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relative price of this initiator is relatively high, and the residual groups in the system after initiating the degradation of polypropylene are relatively large, which has become a negative factor of concern.
In addition, since it is difficult to completely isolate the whole process from the air during the synthesis and granulation of polypropylene, it is inevitable that some polypropylene molecules will be oxidized into trace acid groups, and the catalyst used in the polymerization proc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] (1) Pre-mixing: 997.6g homopolypropylene (produced by Luoyang Petrochemical Polypropylene Co., Ltd., brand name F401) with a melt flow rate of 2g / 10min, 1.0g phosphate nucleating agent CLEARLITENU011, 0.5g antioxidant 1010, 0.5g auxiliary antioxidant 168, 0.4g double 2,5 degrading agent, in the order of homopolymer polypropylene, CLEARLITE NU011, antioxidant 1010, auxiliary antioxidant 168 and double 2,5 degrading agent, add the speed in turn It is a low-speed mixer of 50-100 rpm and pre-mixed at 20-30°C for 3-5 minutes to form a mixture.

[0029](2) Controlling degradation: Add the mixed materials in step (1) to the co-rotating parallel twin-screw extruder, control the extrusion temperature of each section to be 150-200℃, and the screw speed to 150-250 rpm, feeding The machine speed is 20-50 rpm. Table 1 shows the addition amount of each substance and the performance of the obtained degraded polypropylene product during the extrusion process.

Example Embodiment

[0030] Example 2

[0031] Pre-mixing and controlling degradation were carried out according to the method of Example 1, except that the amount of phosphate nucleating agent CLEARLITE NU011 was 2g, and the amount of homopolypropylene was 996.6g. Table 1 shows the added amount of each substance and the properties of the obtained degraded polypropylene during the extrusion process.

Example Embodiment

[0032] Example 3

[0033] Pre-mixing and controlling degradation were performed according to the method of Example 1, except that the amount of the phosphate nucleating agent CLEARLITE NU011 was 3g, and the amount of homopolypropylene was 995.6g. Table 1 shows the added amount of each substance and the properties of the obtained degraded polypropylene during the extrusion process.

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PUM

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Abstract

A chemical degradation method of polypropylene comprises the degradation by adding 0.01 weight percent to 0.2 weight percent of organic peroxide and 0.1 weight percent to 1.0 weight percent of nucleating agent into the polypropylene. The method can effectively improve the efficiency of degradation, increase the melt index of degraded polypropylene, improve the molecular weight distribution of polypropylene, and maintain the good mechanical performances at the same time.

Description

technical field [0001] The invention relates to a controlled degradation method of polypropylene, in particular to a chemical degradation method of polypropylene. Background technique [0002] During the processing of polypropylene, it is often necessary to control the degradation of polypropylene to meet the needs of improving production efficiency and processing technology. U.S. EXXON Chemical Company first realized the controlled degradation of homopolypropylene in 1971. The methods reported in US3,551,943, US3,563,972, US3,608,001, and US3,593,011 mainly adopt the introduction of air during the extrusion process of polypropylene, through The hot air degradation of polypropylene forms free radicals, which triggers β-chain scission of polypropylene to achieve controlled degradation. During the implementation of the above-mentioned patent, the temperature of the barrel of the extruder was as high as 371-427°C, and the temperature distribution mode adopted was reverse distr...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K5/52B29C47/92B29C47/10C08K5/14B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/9259B29C2948/92828B29C2948/92866B29C2948/92885B29C2948/92895
Inventor 杨军忠刘伟景振华孙春燕周涵代振宇
Owner CHINA PETROLEUM & CHEM CORP
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