Foamed polypropylene bead containing beta crystal and preparation method thereof

A technology of foaming beads and polypropylene, which is applied in the field of foaming materials, can solve the problems of batch stability, unfavorable polypropylene foaming, and increasing the cost of resin raw materials, and achieve the effect of small crystal size and high crystal density

Active Publication Date: 2017-04-26
广东炜林纳新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103923382B, CN104974369A need to adopt high melt strength polypropylene resin, which increases the cost of resin raw materials
CN101821326A adopts blending 1~20 parts of polyethylene resin to improve the bonding strength of polypropylene foamed bead molded body, but polyethylene and polypropylene are incompatible, and the size and dispersion state of polyethylene dispersed phase tend to affect The foaming behavior of polypropylene, which leads to batch stability problems; more seriously, the polypropylene autoclave foaming process involves prolonged heat treatment, and the polyethylene dispersed phase may re-coalesce to form large-sized Dispersed phase, which is not conducive to autoclave foaming of polypropylene
CN103923382B chooses to improve the bonding of polypropylene foamed beads by compounding ethylene-acrylic acid copolymers, but the heat treatment in the foaming process will affect the dispersion phase aggregation and migration of the composite ethylene-acrylic acid copolymers, which is not conducive to polypropylene foaming

Method used

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  • Foamed polypropylene bead containing beta crystal and preparation method thereof
  • Foamed polypropylene bead containing beta crystal and preparation method thereof
  • Foamed polypropylene bead containing beta crystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare polypropylene foam beads and molded body materials according to the following steps:

[0038] S1. Composite 5 parts of β nucleating agent, 5 parts of synergist, 1 part of antioxidant, and 89 parts of homopolypropylene resin, and granulate through twin-screw to prepare β nucleating agent masterbatch;

[0039] S2. Add 100 parts of homopolypropylene resin, 1 part of β-nucleating agent masterbatch, 0.5 parts of antistatic agent, and 3 parts of foaming nucleating agent mixture into the twin-screw extruder, and granulate through twin-screw extrusion , to obtain polypropylene particles with β crystals;

[0040] S3. Put 1kg of polypropylene particles and 5L of water into the autoclave, and put high-pressure CO 2 The fluid is injected into the autoclave, and the autoclave is raised from room temperature to 145°C, 150°C, and 155°C, and the pressure is raised to 6.0MPa, so that the blowing agent penetrates into the polypropylene particles;

[0041] S4. Release the pressu...

Embodiment 2

[0051] Except that after reaching 150° C., the kettle body was subjected to isothermal treatment for 10 to 15 minutes, other operations were the same as in Example 1.

Embodiment 3

[0059] Except that the polypropylene resin is a random copolymerized polypropylene resin, the foaming temperature is 130° C., 135° C., and the steam molding pressure is 2 bar, other conditions are the same as in Example 1.

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Abstract

The invention discloses a foamed polypropylene bead containing a beta crystal, belonging to the field of foamed materials. The foamed polypropylene bead containing the beta crystal comprises, by weight, 100 parts of polypropylene resin, 0.2 to 5 parts of beta nucleating agent master batch, 0.5 to 2 parts of an antistatic agent and 1 to 10 parts of a foaming nucleating agent. The invention also discloses a preparation method for the foamed polypropylene bead. According to the invention, a high-pressure fluid is used as a foaming agent; autoclave foaming technology is employed; double or multiple melting peaks including alpha and beta are formed through introduction of the beta crystal into a polypropylene particle, the foamed polypropylene bead and a foamed polypropylene bead preform material; the foamed polypropylene bead with a low foaming temperature and a high expansion ratio is prepared in virtue of the characteristics of low melting point/low crystallization temperature, small crystal size and high crystal density of the beta crystal; and the foamed polypropylene bead preform material containing the beta crystal has high tensile strength, increased by 15 to 50% compared with samples of a same kind under the condition of same density.

Description

technical field [0001] The invention belongs to the field of foaming materials, and in particular relates to a polypropylene foaming bead containing β crystals and a preparation method thereof. Background technique [0002] Polypropylene has the advantages of high mechanical strength, high service temperature, environmental protection, easy recycling, and high cost performance, so its application fields are increasing day by day, and its market share is increasing year by year. Polymer foaming is an important way to realize the lightweight of polypropylene, and has a wide range of application values ​​in the fields of automobiles, rail transit, and cushioning packaging. [0003] The technology of preparing polypropylene sheets by chemical foaming and electronic cross-linking foaming is public, and the polypropylene resins used here are mostly high-melt strength polypropylene resins, and the required high-melt strength polypropylene resins are made by chemical Cross-linking,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08K13/02C08K13/04C08K7/20C08K5/20C08K3/26C08K3/34C08K3/30C08K5/098C08K5/526C08K5/134C08K5/19C08K5/42C08J9/12C08J9/18C08J3/22
CPCC08J3/226C08J9/122C08J9/18C08J2203/06C08J2323/12C08J2323/14C08J2423/12C08J2423/14C08L23/12C08L23/14C08L2203/14C08L2205/24C08L2205/242C08K13/02C08K13/04C08K7/20C08K5/20C08K3/26C08K3/346C08K3/30C08K5/098C08K5/526C08K5/1345C08K5/19C08K5/42
Inventor 郑德陈俊黄玉松吴波
Owner 广东炜林纳新材料科技股份有限公司
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