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Radiation cross-linked polypropylene foam material, preparation method and application thereof

A technology of radiation cross-linking and foaming materials, applied in the field of radiation cross-linking polypropylene foam materials, can solve the problem of uneven cell structure of polypropylene foam materials, small physical foaming temperature window, and difficult foaming process operation. and other problems, to achieve the effects of improving melt strength and foaming performance, good sound insulation and noise reduction, and light weight.

Active Publication Date: 2020-12-25
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the low melt strength, high foaming temperature, small physical foaming temperature window and difficult operation of the foaming process in the prior art in the preparation process of polypropylene foaming materials, and the resulting polypropylene The propylene foam material has defects such as uneven cell structure, large pore size, small pore density, and poor mechanical properties, and provides a radiation crosslinked polypropylene foam material, preparation method and application thereof

Method used

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  • Radiation cross-linked polypropylene foam material, preparation method and application thereof
  • Radiation cross-linked polypropylene foam material, preparation method and application thereof
  • Radiation cross-linked polypropylene foam material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 90 parts of conventional polypropylene with a melt index of 3.0g / 10min and 10 parts of high-density polyethylene particles with a melt index of 1.0g / 10min were mixed by twin-screw at 190°C, and the mixture was placed in a vulcanization molding machine for compression The sheet is finalized, taken out after molding, and placed in the environment to cool naturally to obtain a mixture sheet;

[0050] Put the mixture sheet into an irradiation tank with a nitrogen atmosphere and seal it, place it in a cobalt source for irradiation, and the absorbed dose is 30kGy, then take out the irradiation tank, and store the mixture sheet in a nitrogen atmosphere; Before foaming, take it out, cut it into a sheet of suitable size for foaming, place it in a high-pressure reactor, exhaust the air, inject supercritical carbon dioxide, pressurize it to 20MPa, seal it, and heat it up to 150°C , keep warm for 1.5h, and release the pressure. The average pressure release rate is 5MPa / s.

Embodiment 2

[0052] Absorbed dose is 60kGy, all the other are the same as embodiment 1.

Embodiment 3

[0054] The absorbed dose is 90kGy, and all the other are the same as in Example 1.

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Abstract

The invention provides a radiation cross-linked polypropylene foaming material, a preparation method and applications thereof, wherein the raw materials comprise, by mass, 60-99% of polypropylene and1-40% of a radiation cross-linked polymer. The preparation method comprises: carrying out irradiation on a mixture sheet prepared from polypropylene and a radiation cross-linked polymer under an inertatmosphere, and foaming under a supercritical carbon dioxide condition. According to the present invention, the preparation method has characteristics of simpleness, convenience, high success rate, environmental protection and substantially-improved foaming temperature window, further improves the mechanical properties of the obtained foamed material, and is suitable for industrial application; and the radiation cross-linked polypropylene foaming material has characteristics of small pore size of the foamed pores, large hole density, light weight, good mechanical property, good sound insulation and noise reduction effect, no odor and environment protection.

Description

technical field [0001] The invention relates to a radiation crosslinked polypropylene foam material, a preparation method and an application thereof. Background technique [0002] At present, the materials of a large number of interior and exterior accessories in the automotive industry are mainly polyurethane (PU) boards, polystyrene (PS) foam boards, modified polypropylene (PP) boards and acrylonitrile-butadiene-styrene plastics (ABS) ) plates, etc. [0003] The PU sheet and PS sheet in the prior art have high brittleness and relatively poor impact resistance, so their application in the automobile industry is limited. The ABS board in the prior art has relatively high density, heavy weight, relatively poor sound insulation and noise reduction effect, and poor heat insulation performance, so its application in the automobile industry is also limited. [0004] In the prior art, research results on irradiation modification of PP show that irradiation will cause PP molecula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/06C08L23/08C08J3/28C08J3/24C08J9/12
CPCC08J3/24C08J3/28C08J9/122C08J2203/06C08J2323/12C08J2423/06C08J2423/08C08L23/12C08L2201/08C08L2203/14C08L2207/062C08L2207/066C08L23/06C08L23/0815
Inventor 杨晨光吴国忠邢哲赵全王洪龙张茂江
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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