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Super-tough heat-resistant polylactic acid/rubber alloy and preparation method thereof

A technology of rubber alloy and polylactic acid, which is applied in the field of super-tough heat-resistant polylactic acid/rubber alloy and its preparation, can solve the problem that the toughening effect of rubber cannot be fully exerted, and the crystallization performance of PLA and the impact performance of the blend cannot be effectively improved Low-level problems, to achieve the effect of shortening the processing molding cycle, easy industrial production, and improving the crystallinity of the matrix

Active Publication Date: 2021-11-30
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the serious disadvantage of this method is that the thermodynamic incompatibility between rubber and PLA makes the interfacial bonding strength between the two very poor, which leads to the insufficient play of the toughening effect of rubber on PLA, and the obtained blend The impact performance is much lower than expected
However, for the PLA / core-shell rubber system with good compatibility, the core-shell rubber is generally uniformly distributed in the matrix, and it is very difficult to construct a network-like structure.
In addition, the core-shell rubber particles can not effectively improve the crystallization properties of PLA while toughening PLA. The PLA matrix in the obtained product is still amorphous, and the heat resistance of the product is further improved by the addition of low modulus core-shell rubber. reduce

Method used

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  • Super-tough heat-resistant polylactic acid/rubber alloy and preparation method thereof
  • Super-tough heat-resistant polylactic acid/rubber alloy and preparation method thereof
  • Super-tough heat-resistant polylactic acid/rubber alloy and preparation method thereof

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Effect test

Embodiment 1

[0037] The weight average molecular weight 2.0×10 5 g / mol, linear L-polylactic acid with an optical purity of 98%, and a weight-average molecular weight of 1.0×10 5 g / mol, six-arm D-polylactic acid with an optical purity of 99%, and polybutadiene-polymethyl methacrylate core-shell rubber particles with a particle size of 180nm were pre-mixed evenly, wherein the L-polylactic acid and D-polylactic acid The mass ratio is 100:25, the core-shell rubber particles account for 20% of the mass of the polylactic acid / rubber alloy, and then the premix is ​​melt-blended at a temperature of 200°C for 5 minutes and then granulated to obtain a polylactic acid / rubber alloy material.

Embodiment 2

[0039] The weight average molecular weight is 3.0×10 5 g / mol, linear L-polylactic acid with an optical purity of 95%, and a weight-average molecular weight of 1.6×10 5 g / mol, three-arm D-polylactic acid with an optical purity of 98%, and polybutylacrylate-polymethyl methacrylate core-shell rubber particles with a particle size of 150nm were pre-mixed evenly. The mass ratio is 100:40, the core-shell rubber particles account for 15% of the mass of the polylactic acid / rubber alloy, and then the premix is ​​melt-blended at a temperature of 190°C for 7 minutes and then granulated to obtain a polylactic acid / rubber alloy material.

Embodiment 3

[0041] The weight average molecular weight is 1.6×10 5 g / mol, linear L-polylactic acid with an optical purity of 98%, and a weight-average molecular weight of 2.0×10 5 g / mol, 11-arm star-shaped D-polylactic acid with an optical purity of 98%, and polybutadiene-polymethylmethacrylate core-shell rubber particles with a particle size of 180nm were pre-mixed uniformly, wherein the L-polylactic acid and the D-polylactic acid The mass ratio of polylactic acid is 100:25, the core-shell rubber particles account for 30% of the mass of polylactic acid / rubber alloy, and then the premix is ​​melt blended at a temperature of 200 ° C for 7 minutes and then granulated to obtain polylactic acid / rubber alloy material .

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Abstract

The invention belongs to the technical field of polylactic acid materials and preparation thereof, and particularly relates to a super-tough heat-resistant polylactic acid / rubber alloy with a network-like structure and a preparation method thereof. The invention provides the preparation method of the super-tough heat-resistant polylactic acid / rubber alloy. The preparation method comprises the steps: preparing the polylactic acid / rubber alloy from poly-L-lactic acid, poly-D-lactic acid and rubber particles through a melt blending method, wherein at least one of the poly-L-lactic acid and the poly-D-lactic acid is multi-arm star-shaped polylactic acid, and the rubber particles are rubber particles with core-shell structures. According to the invention, when one of the selected poly-L-lactic acid and poly-D-lactic acid is selected from multi-arm star-shaped polylactic acid, the multi-arm star-shaped polylactic acid and the rubber particles are subjected to melt blending, so that the notch impact strength of the polylactic acid can be greatly improved; the super-tough heat-resistant polylactic acid / rubber alloy can be prepared; and in addition, the method is simple in process and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid material and its preparation, and in particular relates to a super-tough heat-resistant polylactic acid / rubber alloy with quasi-network structure and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a polymer material prepared by chemical polymerization using lactic acid fermented from renewable resources such as corn and wheat as raw materials. It can be completely degraded into non-toxic and harmless carbon dioxide and water in the natural environment. It is a typical renewable and biodegradable environmentally friendly polymer material. PLA has the advantages of good biocompatibility, high transparency, good mechanical strength, and easy processing and molding. It has broad application prospects in many fields such as daily necessities, packaging, medical treatment, textiles, and electronic appliances. Therefore, it is necessary to vigorously develop ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L51/04
CPCC08L67/04C08L2205/03C08L2205/025C08L2207/53C08L2201/08C08L51/04
Inventor 刘慧丽柏栋予严雅楠蔡家铭郑宇杉
Owner CHONGQING UNIV OF ARTS & SCI
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