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Preparation method of clean and environment-friendly polyvinylidene fluoride foamed sheet

A polyvinylidene fluoride and foam sheet technology, which is applied in the field of material molding, can solve the problems that limit the application of PVDF, achieve dimensional stability, improve melt strength, and achieve good surface quality.

Active Publication Date: 2020-08-25
常州长园特发科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This foaming technology limits the application of PVDF in many special fields

Method used

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  • Preparation method of clean and environment-friendly polyvinylidene fluoride foamed sheet
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  • Preparation method of clean and environment-friendly polyvinylidene fluoride foamed sheet

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0022] The invention provides a method for preparing a clean and environment-friendly polyvinylidene fluoride foam sheet, which comprises the following steps:

[0023] Extrusion step S1: first adding polyvinylidene fluoride into a twin-screw extruder and extruding to form a polyvinylidene fluoride sheet;

[0024] Irradiation step S2: performing electron beam irradiation crosslinking on the polyvinylidene fluoride sheet;

[0025] Gas saturation step S3: put the above-mentioned irr...

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Abstract

The invention discloses a preparation method of a clean and environment-friendly polyvinylidene fluoride foamed sheet. The preparation method comprises the following steps of: an extrusion step: firstly, adding polyvinylidene fluoride into a double-screw extruder for extrusion to form a polyvinylidene fluoride sheet; an irradiation step: carrying out electron beam irradiation crosslinking on the polyvinylidene fluoride sheet; a gas saturation step: putting the sheet into a heated autoclave, and injecting supercritical nitrogen into the autoclave so as to make the irradiated crosslinked vinylidene fluoride sheet completely saturated by the supercritical nitrogen; a nucleation step: decompressing and nucleating the irradiated crosslinked vinylidene fluoride sheet in the autoclave in the gassaturation step, decompressing and opening the autoclave after the autoclave is cooled, and taking out a nucleated irradiated crosslinked vinylidene fluoride sheet; and a foaming step: putting the nucleated irradiated crosslinked vinylidene fluoride sheet into the autoclave again for foaming after cooling the nucleated irradiated crosslinked vinylidene fluoride sheet to room temperature, and taking out the foamed sheet. The supercritical nitrogen is used as a foaming agent, and the obtained foam sheet is clean, tasteless, uniform and fine in foam holes and excellent in mechanical property.

Description

technical field [0001] The invention relates to the technical field of material molding, in particular to a preparation method of a polyvinylidene fluoride foamed sheet. Background technique [0002] Polymer foam materials have the functions of light weight, heat insulation, sound insulation, cushioning and shock absorption, and are widely used in transportation, construction, packaging, daily necessities, sports equipment and other fields. High-performance foam materials can also be used in cutting-edge fields such as military affairs and aerospace. The commonly used foam materials are polystyrene foam (EPS), polyurethane foam (EPU) and polyethylene foam (EPE). These traditional foam materials have many deficiencies in heat resistance, chemical resistance, weather resistance and flame retardancy. Requirements for performance, flame retardancy, etc. [0003] Fluoropolymers have excellent properties such as heat resistance, chemical resistance, weather resistance, and flam...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08J7/12C08J5/18C08L27/16
CPCC08J9/122C08J7/123C08J5/18C08J2203/06C08J2203/08C08J2327/16Y02P20/54
Inventor 杨兆平魏立东李志兴
Owner 常州长园特发科技有限公司
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