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PLA/EVA supercritical foaming composite material and preparation method thereof

A composite material, supercritical technology, applied in the field of foam materials, can solve the problems of tensile strength, bending resistance reduction, poor comprehensive mechanical properties, poor processing flow performance, etc., to improve bending resistance and high rebound rate. , The effect of good bending resistance

Inactive Publication Date: 2020-07-10
福建安达福新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The foaming effect is not good, resulting in uneven cells and low foaming ratio;
[0009] 2. After foaming, the tensile strength and bending resistance are greatly reduced, and it is easy to break; and the resilience performance is poor, and permanent deformation is easy to occur, and the comprehensive mechanical properties are poor, which affects the use;
[0010] 3. During the foaming process, the processing fluidity is poor, which is not conducive to processing, etc.

Method used

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  • PLA/EVA supercritical foaming composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A PLA / EVA supercritical foaming composite material is made of raw materials comprising the following parts by weight:

[0059] 300-370 parts of polylactic acid,

[0060] 40-55 parts of ethylene-vinyl acetate copolymer,

[0061] 30-36 parts of methyl vinyl silicone rubber,

[0062] 16-20 parts of maleic anhydride grafted polypropylene,

[0063] 6-9 parts of nucleating agent,

[0064] Fumed silica 20-25 parts,

[0065] 3-4.5 parts of chain extender,

[0066] 5-8 parts of cross-linking agent,

[0067] 4-5 parts of dispersant.

[0068] In this embodiment, the PLA / EVA supercritical foam composite material is preferably, but not limited to, made of raw materials comprising the following parts by weight:

[0069] 335 parts of polylactic acid,

[0070] 48 parts of ethylene-vinyl acetate copolymer,

[0071] 33 parts of methyl vinyl silicone rubber,

[0072] 18 parts of maleic anhydride grafted polypropylene,

[0073] 7.5 parts of nucleating agent,

[0074] 23 parts o...

Embodiment 2

[0091] A PLA / EVA supercritical foaming composite material is made of raw materials comprising the following parts by weight:

[0092] 300 parts of polylactic acid,

[0093] 40 parts of ethylene-vinyl acetate copolymer,

[0094] 30 parts of methyl vinyl silicone rubber,

[0095] 16 parts of maleic anhydride grafted polypropylene,

[0096] 6 parts of nucleating agent,

[0097] Fumed silica 20 parts,

[0098] 3 parts of chain extender,

[0099] 5 parts of crosslinking agent,

[0100] 4 parts of dispersant.

[0101] In this embodiment, the nucleating agent is TMC-328.

[0102] In this embodiment, the chain extender is 4-hydroxyethyloxyethyl-1-hydroxyethylphenylene ether.

[0103] In this embodiment, the crosslinking agent is a mixture of magnesium methacrylate and di-tert-butyl hydroperoxide.

[0104] In this embodiment, the mass ratio of magnesium methacrylate and di-tert-butyl hydroperoxide in the mixture of magnesium methacrylate and di-tert-butyl hydroperoxide is 1:2....

Embodiment 3

[0114] A PLA / EVA supercritical foaming composite material is made of raw materials comprising the following parts by weight:

[0115] 370 parts of polylactic acid,

[0116] 55 parts of ethylene-vinyl acetate copolymer,

[0117] 36 parts of methyl vinyl silicone rubber,

[0118] 20 parts of maleic anhydride grafted polypropylene,

[0119] 9 parts of nucleating agent,

[0120] Fumed silica 25 parts,

[0121] 4.5 parts of chain extender,

[0122] 8 parts of crosslinking agent,

[0123] Dispersant 5 parts.

[0124] In this embodiment, the nucleating agent is TMC-328.

[0125] In this embodiment, the chain extender is 4-hydroxyethyloxyethyl-1-hydroxyethylphenylene ether.

[0126] In this embodiment, the crosslinking agent is a mixture of magnesium methacrylate and di-tert-butyl hydroperoxide.

[0127] In this embodiment, the mass ratio of magnesium methacrylate and di-tert-butyl hydroperoxide in the mixture of magnesium methacrylate and di-tert-butyl hydroperoxide is 1:3.2...

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Abstract

The invention discloses a PLA / EVA supercritical foaming composite material and a preparation method thereof. The PLA / EVA supercritical foaming composite material is prepared from the following raw materials in parts by weight: 300-370 parts of polylactic acid, 40-55 parts of an ethylene-vinyl acetate copolymer, 30-36 parts of methyl vinyl silicone rubber, 16-20 parts of maleic anhydride grafted polypropylene, 6-9 parts of a nucleating agent, 20-25 parts of fumed silica, 3-4.5 parts of a chain extender, 5-8 parts of a cross-linking agent and 4-5 parts of a dispersing agent. The PLA / EVA supercritical foaming composite material disclosed by the invention is high in foaming ratio, the foam holes are all of a closed-cell structure, the sizes (diameters) of the foam holes are moderate, the foamholes are uniform, and the foaming effect is good; the tensile strength is high, the bending resistance is good, the toughness is high, the rebound rate is high, the elasticity is good, and the comprehensive mechanical property is good; and the material is degradable and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of foaming materials, in particular to a PLA / EVA supercritical foaming composite material and a preparation method thereof Background technique [0002] Polylactic acid (PLA) is a biodegradable polymer prepared by chemical synthesis from renewable plant resources. Various films, fibers and other products prepared can be widely used in clothing, textiles, non-woven fabrics, packaging, agricultural , forestry, medical and health supplies, daily necessities and other fields. PLA has excellent biocompatibility and biodegradability, and the final degradation products are carbon dioxide and water, which will not pollute the environment. The polylactic acid foaming material is prepared by melting and kneading, molding and foaming; the polylactic acid foaming material can also be prepared by supercritical carbon dioxide. [0003] Polylactic acid foamed materials can replace petroleum-based foamed plastics in packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L23/08C08L31/04C08L83/07C08L51/06C08L33/02C08K13/04C08K7/26C08K5/06C08K5/098C08K5/14C08K5/20C08J9/12
CPCC08J9/122C08J9/0061C08J9/0095C08J9/0066C08J9/0023C08J9/0028C08J2203/08C08J2203/06C08J2205/052C08J2300/16C08J2367/04C08J2423/08C08J2431/04C08J2483/07C08J2451/06C08J2433/02
Inventor 丁尤权丁星懿林清锴吕方舟丁雪峰杨文华
Owner 福建安达福新材料科技有限公司