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Direct injection molding polylactic acid/polypropylene chemical micro-foaming composite material and a preparation method thereof

A composite material and chemical blowing agent technology, applied in the field of polymers, can solve the problems of low viscosity and strength of PLA melt, unfavorable automatic production, high energy consumption, etc., and achieve high product design freedom, easy industrial application, and mechanical properties excellent effect

Inactive Publication Date: 2018-06-22
ORINKO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the present invention solves the low viscosity and strength of PLA melt, the melt is difficult to support cell growth in the foam molding process, and defects such as rupture, foaming, and collapse occur; the polarity of polylactic acid and polypropylene Different, it is a completely incompatible system, and it is difficult to disperse the two evenly; the extrusion foaming molding cycle is long, the energy consumption is high, and it is not conducive to automatic production and other issues

Method used

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  • Direct injection molding polylactic acid/polypropylene chemical micro-foaming composite material and a preparation method thereof
  • Direct injection molding polylactic acid/polypropylene chemical micro-foaming composite material and a preparation method thereof
  • Direct injection molding polylactic acid/polypropylene chemical micro-foaming composite material and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The polylactic acid / polypropylene chemical micro-foaming composite material that can be directly injected in this embodiment is composed of the following raw materials according to weight percentage:

[0034] PLA / PP composite material 99%

[0035] Chemical blowing agent 1%

[0036] Wherein, the PLA / PP composite material is composed of the following raw materials in parts by weight:

[0037]

[0038]

[0039] Concrete preparation method comprises the following steps:

[0040] (1) Weigh 3 parts of γ-aminopropyltriethoxysilane coupling agent and add it to 100 mL of ethanol: water solution with a volume of 90:1, stir at room temperature for 10-30 min, and slowly add 97 parts of silicon dioxide. Raise the temperature to 50-60°C and stir at constant temperature for 24-48h, centrifuge, wash with deionized water for 3-5 times, vacuum dry the centrifuged product at 50-80°C for 24h-48h, grind the dried product, and finally obtain the modified silica;

[0041] (2) Weigh 90...

Embodiment 2

[0046] The polylactic acid / polypropylene chemical micro-foaming composite material that can be directly injected in this embodiment is composed of the following raw materials according to weight percentage:

[0047] PLA / PP composite material 97%

[0048] Chemical blowing agent 3%

[0049] Wherein, the PLA / PP composite material is composed of the following raw materials in parts by weight:

[0050]

[0051]

[0052] Concrete preparation method comprises the following steps:

[0053] (1) Weigh 10 parts of γ-aminopropyltriethoxysilane coupling agent and add it to 100 mL of ethanol: water solution with a volume of 90:1, stir at room temperature for 10-30 minutes, and slowly add 90 parts of calcium carbonate. Raise the temperature to 50-60°C and stir at constant temperature for 24-48h, centrifuge, wash with deionized water for 3-5 times, vacuum dry the centrifuged product at 50-80°C for 24h-48h, grind the dried product, and finally obtain the modified calcium carbonate;

...

Embodiment 3

[0059] The polylactic acid / polypropylene chemical micro-foaming composite material that can be directly injected in this embodiment is composed of the following raw materials according to weight percentage:

[0060] PLA / PP composite material 97.5%

[0061] Chemical blowing agent 2.5%

[0062] Wherein, the PLA / PP composite material is composed of the following raw materials in parts by weight:

[0063]

[0064] Concrete preparation method comprises the following steps:

[0065] (1) Weigh 6 parts of γ-aminopropyltriethoxysilane coupling agent and add it to 100 mL of ethanol:water solution with a volume of 90:1, stir at room temperature for 10-30 minutes, and slowly add 94 parts of silicon dioxide. Raise the temperature to 50-60°C and stir at constant temperature for 24-48h, centrifuge, wash with deionized water for 3-5 times, vacuum dry the centrifuged product at 50-80°C for 24h-48h, grind the dried product, and finally obtain the modified silica;

[0066] (2) Weigh 77 pa...

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Abstract

The invention provides a direct injection molding polylactic acid / polypropylene chemical micro-foaming composite material and a preparation method thereof. The preparation method is characterized in that a PLA / PP composite material and a chemical foaming agent are mixed uniformly according to a suitable ratio, and the resulting mixture is subjected to micro-foaming molding in an injection moldingmachine, so that the direct injection molding polylactic acid / polypropylene chemical micro-foaming composite material is prepared, wherein the PLA / PP composite material is prepared from the followingcomponents in parts by weight: 15-25 parts of HMSPP, 10-20 parts of functionalized PP, 47-67 parts of modified PLA, 3-8 parts of modified inorganic nucleating agent, 0.2-0.4 part of antioxidant, 0.5-1part of lubricant, and 0-2 parts of other additives. The prepared PLA / PP composite material has high melt strength and excellent mechanical properties; an injection micro-foaming molding process canbe directly adopted to obtain a product with fine and uniform cell pores and an average diameter less than 79 [mu]m; and the molding process is simple, and product design degree of freedom is high, therefore, industrialized application is facilitated, and high-volume production of the product can be achieved.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a directly injection-molded polylactic acid / polypropylene chemical micro-foaming composite material and a preparation method thereof. technical background [0002] Polylactic acid (PLA) is a biodegradable material with the advantages of non-toxic and non-irritating, good biocompatibility, high strength, low shrinkage, strong plasticity, and easy processing and molding. As a new type of green plastic, it has always attracted attention. It is widely used in many fields. In recent years, with the increasing shortage of petroleum resources and more and more serious environmental pollution, polylactic acid foam materials have attracted extensive attention from researchers because of their significantly reduced material density, saving material consumption, and high specific strength. However, PLA is a linear semi-crystalline polymer with low branching, less long-chain branchin...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08L51/06C08L23/10C08K13/06C08K9/06C08K3/36C08K5/134C08K5/526C08K5/098C08K3/26C08K5/372C08F255/02C08F222/14C08F220/32C08G18/76C08G18/42C08G18/32C08G18/66C08G18/75C08G18/73C08G63/91C08J9/08
CPCC08F255/02C08G18/3206C08G18/4277C08G18/664C08G18/73C08G18/755C08G18/7614C08G63/912C08J9/0061C08J9/0066C08J9/009C08J9/08C08J2203/02C08J2375/04C08J2423/10C08J2451/06C08K5/372C08K5/526C08K13/06C08K9/06C08K3/36C08K5/1345C08K5/098C08K2003/265C08F220/325C08F222/103
Inventor 石阳阳周海李飞夏洋李荣群
Owner ORINKO NEW MATERIAL CO LTD
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