Method for improving foaming property of polypropylene

A technology for foaming performance and polypropylene, which is applied in the field of improving the foaming performance of polypropylene, can solve the problems of difficult foaming and narrow temperature range, and achieve regular cell structure, large cell size, and increased foaming temperature range. big effect

Inactive Publication Date: 2017-03-08
WUXI MINGSHENG STRONG BLOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in recent years, many countries have vigorously developed PP foaming materials. However, since PP is a semi-crystalline polymer, the temperature range that can be foamed (collectively referred to as the foaming temperature range) is narrow, only 4°C, and it is difficult to foam.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for improving the foaming properties of polypropylene, comprising:

[0017] (1) Polypropylene, 3-isopropenyl-α, α' dimethyl isocyanate, dicumyl peroxide and styrene are mixed uniformly in a weight ratio of 100:4:0.5:2;

[0018] (2) The mixture is added into a torque rheometer to carry out a melt-grafting reaction, the reaction temperature is 180° C., and the reaction time is 5 min;

[0019] (3) Dissolve the grafted reaction product in xylene at 110°C, add acetone to settle, separate and dry the solid phase in vacuum at 80°C to obtain modified polypropylene.

Embodiment 2

[0021] A method for improving the foaming properties of polypropylene, comprising:

[0022] (1) Polypropylene, 3-isopropenyl-α, α' dimethyl isocyanate, dicumyl peroxide and styrene are mixed uniformly in a weight ratio of 100:10:1:5;

[0023] (2) The mixture is added to a torque rheometer to carry out a melt grafting reaction, the reaction temperature is 200° C., and the reaction time is 10 min;

[0024] (3) Dissolve the grafted reaction product in xylene at 130°C, add acetone to settle, separate and dry the solid phase in vacuum at 100°C to obtain modified polypropylene.

Embodiment 3

[0026] A method for improving the foaming properties of polypropylene, comprising:

[0027] (1) Polypropylene, 3-isopropenyl-α, α' dimethyl isocyanate, dicumyl peroxide and styrene are mixed uniformly in a weight ratio of 100:6:0.8:3.5;

[0028] (2) The mixture is added to the torque rheometer to carry out the melt grafting reaction, the reaction temperature is 190°C, and the reaction time is 8min;

[0029] (3) Dissolve the grafted reaction product in xylene at 120°C, add acetone to settle, separate and dry the solid phase in vacuum at 90°C to obtain modified polypropylene.

[0030] The polypropylene prepared by modification in Example 1-3 has a regular cell structure, large and uniform cell size in the range of 120-152 ° C, and its foaming temperature range is increased compared with the polypropylene before modification. Large and uniform cell size.

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PUM

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Abstract

The invention discloses a method for improving the foaming property of polypropylene. The method comprises steps as follows: (1) polypropylene, 3-isoprophenyl-alpha,alpha'dimethyl isocyanate, dicumyl peroxide and styrene are evenly mixed in the weight ratio being 100:(4-10):(0.5-1):(2-5); (2) the mixture is added to a torque rheometer for a melt grafting reaction at the reaction temperature of 180-200 DEG C for 5-10 min; (3) a grafted reaction product is dissolved in xylene at 110-130 DEG C, acetone is added for precipitation, a solid phase is subjected to vacuum drying at 80-100 DEG C after separation, and modified polypropylene is obtained. The modified polypropylene has the regular foam structure and large and uniform foam size in at 120-152 DEG C, and the modified polypropylene has the larger foaming temperature interval and more uniform and regular foam size than those of unmodified polypropylene.

Description

technical field [0001] The invention relates to the technical field of foaming, in particular to a method for improving the foaming performance of polypropylene. Background technique [0002] Polymer foamed material refers to a polymer-based material with numerous cells inside, and can also be regarded as a composite material filled with gas. It has the characteristics of low density, good heat and sound insulation performance, and high specific strength. It is widely used in household daily necessities, vehicles, insulation materials, packaging materials, flame retardant materials, electrical appliances, sports facilities, electronic products and other industries. High-performance foam materials play an important role in military, aerospace and other cutting-edge fields. [0003] Taking advantage of its excellent heat resistance, hygiene, thermal insulation and good environmental effects, PP foam materials can play an important role in packaging, automobiles, insulation, ...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F226/02C08F212/08C08J9/02
CPCC08F255/02C08J9/02C08J2351/06
Inventor 张达明
Owner WUXI MINGSHENG STRONG BLOWER
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