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Low-cost micro-foaming injection molding polypropylene plastic product and preparation method thereof

A polypropylene plastic and micro-foaming technology, which is applied in the field of foamed plastics, can solve the problems affecting the appearance quality and performance of injection molded parts, the size of foamed polypropylene pores is large, and the foaming effect is difficult to control, so as to achieve low cost, Foaming quality is good, the effect of improving foaming quality

Inactive Publication Date: 2018-09-14
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For microcellular foamed injection-molded polypropylene, which is currently widely used, the steps are cumbersome, the process is harsh, the cost is high, the foaming efficiency is low and the foaming effect is difficult to control, and the foamed polypropylene has a large pore size and uneven distribution. Uniformity, which in turn affects the appearance quality and performance of injection molded parts. The present invention proposes a low-cost micro-foamed injection-molded polypropylene plastic product and a preparation method, thereby effectively realizing low-temperature foaming, improving foaming quality, and simple process and lower cost

Method used

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  • Low-cost micro-foaming injection molding polypropylene plastic product and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation process is:

[0032] (1) Add 60 parts by weight of TiO 2 The porous network structure powder and 32 parts by weight of blowing agent powder are added to the blower, and after discharging, they are added to the high-speed mixer together with 8 parts by weight of the binder and stirred, and the package can be realized after cooling; TiO 2 The average pore diameter of the porous network structure powder is 50μm, and the porosity is 66%; the foaming agent is AC foaming agent; the binder is epoxy resin binder;

[0033] (2) Mix 26 parts by weight of the encapsulated powder in step (1) with 71 parts by weight of propylene monomer, 0.8 parts by weight of initiator, 0.7 parts by weight of catalyst, and 1.5 parts by weight of molecular weight regulator in the reactor, and heat up for gas phase Bulk polymerization is used to prepare expandable PP material with support; the initiator is benzoyl peroxide; the catalyst is Ziegler-Natta catalyst; the molecular weight regulat...

Embodiment 2

[0039] The preparation process is:

[0040] (1) 70 parts by weight of TiO 2 The porous network structure powder and 25 parts by weight of blowing agent powder are added to the blower, and after discharging, they are added to the high-speed mixer together with 5 parts by weight of the binder and stirred, and the package can be realized after cooling; TiO 2 The average pore diameter of the porous network structure powder is 30μm, and the porosity is 60%; the foaming agent is AC foaming agent; the binder is polyurethane binder;

[0041] (2) Mix 20 parts by weight of the powder packaged in step (1) with 78 parts by weight of propylene monomer, 0.5 parts by weight of initiator, 0.5 parts by weight of catalyst, and 1 part by weight of molecular weight regulator in the reaction vessel, and heat up for gas phase Bulk polymerization is used to prepare an expandable PP material containing a support; the initiator is dicumyl peroxide; the catalyst is a metallocene catalyst; the molecular weigh...

Embodiment 3

[0047] The preparation process is:

[0048] (1) Add 55 parts by weight of TiO 2 The porous network structure powder and 35 parts by weight of blowing agent powder are added to the blower. After discharging, they are added to the high-speed mixer together with 10 parts by weight of the binder and stirred. After cooling, the packaging can be realized; TiO 2 The average pore diameter of the porous network structure powder is 100μm, and the porosity is 70%; the foaming agent is AC foaming agent; the binder is polyurethane binder;

[0049] (2) Mix 30 parts by weight of the powder packaged in step (1) with 66~ parts by weight of propylene monomer, 1 part by weight of initiator, 1 part by weight of catalyst, and 2 parts by weight of molecular weight regulator in the reactor, and proceed with heating Gas phase bulk polymerization reaction to prepare expandable PP material containing support; initiator is 4,4'-dihydroxybenzophenone; catalyst is Ziegler-Natta catalyst; molecular weight regula...

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Abstract

The invention provides a low-cost micro-foaming injection molding polypropylene plastic product and a preparation method thereof. According to the method, foaming agent powder is loaded into holes ofa titanium dioxide porous network structure powder body, the powder body and a binding agent are mixed and stirred, sealing is achieved, the sealed powder body, a propylene monomer, an initiator, a catalyst and a molecular weight regulator are mixed and then heated to perform polymerization reaction to prepare an expandable polypropylene material containing a support, the expandable polypropylenematerial is melt and fed into a die cavity by an injection molding machine, and heating and foaming are performed, so that the micro-foaming injection molding polypropylene plastic product can be prepared. According to the method, foaming agents are loaded into the holes of the titanium dioxide porous network structure powder body and sealed and protected by the aid of the binding agent, a polypropylene melt can be supported after the foaming agents are dispersed in polypropylene, collapse does not easily be generated, forming is performed without heating to reach a melting point of the polypropylene or more, foaming efficiency is high, forming air hole is small in size, distribution is uniform, and foaming quality is good.

Description

Technical field [0001] The invention relates to the field of foamed plastics, in particular to the foaming of polypropylene plastics, in particular to a low-cost micro-foamed injection molded polypropylene plastic product and a preparation method. Background technique [0002] Polypropylene is one of the five general-purpose plastics. It is widely used in the automobile industry to prepare interior and exterior decorations such as bumpers, instrument panels, and door panels, and has made important contributions to the development of the automobile industry. However, with the development of the automobile industry, the requirements for lightweight automotive materials have further increased. The micro-foamed polypropylene material with its uniformly closed micro-cell foam cell structure not only achieves the purpose of lightweight automotive materials, but also improves material rigidity. , Improve the surface quality of parts, eliminate sink marks, eliminate internal stress, redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L63/00C08K3/22C08J9/10
CPCC08J9/103C08J9/0066C08J2203/04C08J2323/12C08J2463/00
Inventor 陈庆昝航
Owner CHENDU NEW KELI CHEM SCI CO LTD