Polypropylene foam material with gradient pore structure and preparation method thereof

A polypropylene foam and gradient cell technology, which is applied in the field of polypropylene foam and its preparation, achieves the effects of low equipment requirements, guaranteed temperature resistance, and reduced cost

Inactive Publication Date: 2018-06-15
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many studies on gradient porous materials in the field of ceramics and metals, but less in the field of polymer materials.

Method used

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  • Polypropylene foam material with gradient pore structure and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the polypropylene foam material with gradient cell structure:

[0037] 1) Three kinds of polypropylene resins with different melt strengths and antioxidant B215 are mixed and fed with different nucleating agents respectively, and then multi-layer co-extrusion, wire drawing and pelletizing by an extruder to obtain a three-layer distribution polypropylene resin particles;

[0038] Among them, polypropylenes with different melt strengths are obtained by modifying the same matrix resin (the matrix resin is homopolypropylene, Daqing Petrochemical T30S), and the melt strengths are 2cN, 9cN, and 20cN respectively; the nucleating agents are talcum powder, carbon Nanotubes and graphene are added in amounts of 0.05%, 0.1%, and 0.5% respectively; antioxidant B215 is added in an amount of 0.2wt%.

[0039] 2) Put the polypropylene resin particles with three-layer distribution in the reaction kettle, feed nitrogen gas as the foaming agent, control the press...

Embodiment 2

[0041] The preparation method of the polypropylene foam material with gradient cell structure:

[0042] 1) Three kinds of polypropylene resins with different melt strengths and antioxidant B215 are mixed and fed with different nucleating agents respectively, and then multi-layer co-extrusion, wire drawing and pelletizing by an extruder to obtain a three-layer distribution polypropylene resin particles;

[0043] Among them, polypropylenes with different melt strengths are obtained by modifying the same matrix resin (the matrix resin is homopolypropylene, Daqing Petrochemical T30S), and the melt strengths are 2cN, 8cN, and 26cN respectively; the nucleating agents are talcum powder, carbon Nanotubes and graphene are added in amounts of 0.03%, 0.3%, and 0.9% respectively; antioxidant B215 is added in an amount of 0.2wt%.

[0044] 2) The polypropylene resin particles with three-layer distribution are placed in the reaction kettle, and the blowing agent CO 2 , control the pressure...

Embodiment 3

[0046] The preparation method of the polypropylene foam material with gradient cell structure:

[0047] 1) Three kinds of polypropylene resins with different melt strengths and antioxidant B215 are mixed and fed with different nucleating agents respectively, extruded and granulated by an extruder to obtain polypropylene resin particles with different compositions, The polypropylene resin particles of different compositions are respectively molded to obtain polypropylene sheets of different compositions, which are melted and stacked to obtain a polypropylene resin sheet with a three-layer distribution;

[0048] Among them, polypropylenes with different melt strengths are obtained by modifying the same matrix resin (the matrix resin is homopolypropylene, Daqing Petrochemical T30S), and the melt strengths are 3cN, 5cN, and 15cN respectively; the nucleating agents are calcium carbonate, white The addition amount of carbon black and kaolin is 0.02%, 0.08%, 0.8% respectively; the ad...

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Abstract

The invention discloses a polypropylene foam material with a gradient pore structure and a preparation method thereof, belongs to the technical field of foam materials, and solves the problem to provide a preparation method of a foam material, which has the advantages of being simple in process, low in equipment requirement, and capable of realizing gradient change of foam pores in the foam material. According to the preparation method, polypropylenes with different melt strengths and a nucleating agent are firstly mixed; polypropylene resin particles having multi-layer distribution can be obtained by multi-layer co-extruding, drawing and pelletizing, or polypropylene resin particles having various components can be obtained by extrusion by an extruder, drawing and pelletizing, and a multi-layered polypropylene resin sheet can be obtained by mould pressing into sheets and superimposing and melting-molding; and finally the multi-layered particles or the multi-layered sheet are foamed toobtain the polypropylene foam material with the gradient pore structure. The polypropylene foam material has the characteristics of gradual change of the foam pore structure, the functionalization ofthe polypropylene foam material can be effectively achieved, the cost is reduced, and application methods of the material in the automotive, food, medical and other fields can be broadened.

Description

technical field [0001] The invention belongs to the technical field of polymer foam materials, and in particular relates to a polypropylene foam material with a gradient pore structure and a preparation method thereof. Background technique [0002] Functionally graded materials are two or more raw materials with different properties, and the elements (composition, structure) that make up the material are continuously changed along a certain direction by using a different composite technology than before, so that the properties and functions of the material are also changed. New materials with gradient changes. Gradient porous material is a kind of functionally graded material, which is a material whose porosity changes in a gradient along a certain direction. This kind of material with gradient structure exists in a large number in nature. Bamboo, wood and bone all have typical gradient porous structure. The dense part of the pore structure makes the material have sufficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08K3/34C08K7/24C08K3/04C08K3/26C08K3/36C08K3/38C08J9/14C08J9/12
CPCC08J9/0066C08J9/0071C08J9/122C08J9/141C08J2203/06C08J2203/14C08J2323/12C08J2323/14
Inventor 唐涛邱健邢海平姜治伟李明罡王凯薛俭
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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