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Preparation method of polypropylene foam

A polypropylene foam and foaming agent technology, applied in the field of polypropylene foam preparation, can solve the problems of weak toughness, difficulty in foaming polypropylene foam materials, and difficulty in dispersing nucleating agents, and achieves the effect of increasing toughness

Pending Publication Date: 2021-12-24
南京雷泰克材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing polypropylene foam to improve the problems of difficult foaming, weak toughness and difficult dispersion of nucleating agents in polypropylene foam materials.

Method used

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Examples

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Effect test

preparation example Construction

[0017] In the embodiment of the present invention, a method for preparing polypropylene foam is characterized in that it includes the following steps: Step 1: Prepare the following materials according to the mass fraction ratio, including 90-100 parts of PP resin and 10-30 parts of foaming agent , 0.3-6 parts of foaming aids, 0.5-2 parts of crosslinking aids, 0.05-0.1 parts of antioxidants and 0.1-2 parts of nucleating agent precursors; step 2: first foaming aids The nucleating agent precursor is ground and sieved evenly, and finally the mixture is added to the mixer and mixed evenly; Step 3: Add PP resin, foaming agent, crosslinking agent, and antioxidant to the mixer in sequence for mixing, and finally mix the mixture Add a twin-screw extruder, use the twin-screw extruder to extrude and roll into thin sheets, and then foam to obtain polypropylene foam.

[0018] Further, a preparation method of polypropylene foam, the PP resin is a copolymerized PP resin; the foaming agent is...

Embodiment 1

[0022] First weigh 2 parts of pimelic acid and 2 parts of zinc oxide, grind them evenly and sieve them, then add them to the mixer, and mix 100 parts of PP resin, 20 parts of azodicarbonamide, 1 part of benzoyl peroxide, 0.08 parts Antioxidant 168 was sequentially added to the mixer, and mixed for 10 minutes at 120°C and 2MPa. After the mixture was obtained, the mixture was added to a twin-screw extruder at 150-190°C and rolled into sheets, and then foamed to obtain polypropylene foam.

Embodiment 2

[0024] First, weigh 0.1 part of adipic acid and 0.3 part of zinc oxide, grind them evenly and sieve them, then add them into the mixer, and mix 90 parts of PP resin, 10 parts of azodicarbonamide, 0.5 parts of dicumyl peroxide, 0.05 Parts of antioxidant 1010 were sequentially added to the mixer, and mixed at 150°C and 0.5MPa for 15 minutes to obtain a mixture, which was added to a twin-screw extruder at 150-190°C and rolled into sheets, and then foamed to obtain polypropylene foam.

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PUM

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Abstract

The invention discloses a preparation method of polypropylene foam. The preparation method specifically comprises the following steps: firstly, weighing a foaming aid and a nucleating agent precursor according to a certain proportion, uniformly grinding, screening, then adding into a mixer, sequentially adding PP resin, a foaming agent, a cross-linking agent and an antioxidant, mixing for a period of time under certain conditions to obtain a mixture, adding the mixture into a double-screw extruder, extruding and rolling into sheets under certain conditions, and foaming to obtain the polypropylene foam. The polypropylene foam disclosed by the invention has the beneficial effects that zinc oxide is used as a foaming aid, and the foaming temperature of an AC foaming agent is reduced, so that the PP melt strength during foaming is improved, and the foaming performance of a formula is enhanced; and the PP foam and zinc oxide generate a zinc-containing nucleating agent in situ, so that the problem that the added nucleating agent is difficult to disperse is solved, the relative content of the beta phase of the PP foam is increased, the toughness of the material is greatly improved, and the material has fine and uniform pores and good overall performance.

Description

technical field [0001] The invention relates to the field of composite polymer materials, in particular to a preparation method of polypropylene foam. Background technique [0002] Polypropylene (PP) foam materials are widely used in automobiles, construction, sports, packaging and other fields due to their excellent mechanical properties, outstanding high temperature stability, environmental stress crack resistance, and good degradability. However, PP is a semi-crystalline polymer, its melt strength is low, foaming is difficult, and the crystallization speed is slow during the melting and cooling process, and it is easy to produce large spherulites, and stress concentration is easy to occur at the interface of spherulites. As a result, the mechanical properties of the material are reduced, and the polypropylene foam material has disadvantages such as insufficient weather resistance, weak toughness, and easy brittleness at low temperatures, which limits the application of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L79/08C08K3/22C08K5/14C08K5/092C08J9/10
CPCC08J9/103C08J9/0095C08J9/0066C08J9/0023C08J9/0061C08J2203/04C08J2323/14C08J2479/08C08K2003/2296C08K5/14C08K5/092
Inventor 黄玉安高文通刘睿曹怡晨沐欣雨曹潇张波韩冰
Owner 南京雷泰克材料科技有限公司
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