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Super-tough high heat-resistant polylactic acid / elastomer blended material or article and preparation method thereof

An elastomer and polylactic acid technology, applied in the field of polymer materials and their preparation, can solve the problems of inability to effectively improve the crystallization rate, poor heat resistance of polylactic acid, and lower use temperature, so as to improve the degree of crystallinity, accelerate the crystallization of the matrix, improve the The effect of melt viscosity

Active Publication Date: 2015-09-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the elastomer is usually uniformly dispersed in the polylactic acid matrix in the form of spherical particles, its toughening efficiency is significantly lower than that of the "like network" or "like bicontinuous" phase; At the same time, lactic acid cannot effectively improve its crystallization rate, so that the polylactic acid matrix is ​​still in an amorphous state in the processed molded products, which makes the heat resistance of polylactic acid originally very unsatisfactory become worse with the introduction of low modulus elastomers. Poor, the use temperature is further reduced

Method used

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  • Super-tough high heat-resistant polylactic acid / elastomer blended material or article and preparation method thereof
  • Super-tough high heat-resistant polylactic acid / elastomer blended material or article and preparation method thereof
  • Super-tough high heat-resistant polylactic acid / elastomer blended material or article and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] First 85 parts of weight average molecular weight of 1.7 × 10 5 g·mol, L-polylactic acid with an optical purity of 98.6% and 15 parts with a molecular weight of 1.2×10 5 g·mol, the third component D-polylactic acid with an optical purity of 99.5% is premixed evenly, and then thermoplastic polyurethane with a weight fraction of 25wt% is added to continue mixing until uniform; Polylactic acid / elastomer blended materials are obtained by granulation after melt mixing, or continue to process the blended materials into products with HAAK MiniJet micro-injection molding machine at 190°C.

Embodiment 2

[0034] First 80 parts of weight average molecular weight of 5.7 × 10 5 g·mol, L-polylactic acid with an optical purity of 99.1% and 20 parts with a molecular weight of 5.2×10 5 g·mol, the third component D-polylactic acid with an optical purity of 99.7% is premixed evenly, and then thermoplastic polyurethane with a weight fraction of 15wt% is added to continue mixing until uniform; Polylactic acid / elastomer blended material is obtained by granulation after melt mixing, or the blended material is processed into products with HAAK MiniJet micro-injection molding machine at 210°C.

Embodiment 3

[0036] First, 75 parts of weight average molecular weight are 5.9×10 4 g·mol, L-polylactic acid with an optical purity of 95% and 25 parts with a molecular weight of 2.5×10 4 g·mol, the third component D-polylactic acid with an optical purity of 97% is premixed uniformly, and then polycaprolactone with a weight fraction of 5wt% is added to continue mixing until uniform; the mixed material is added to the HAAKE internal mixer at Melt and mix at 220°C and then granulate to obtain polylactic acid / elastomer blended material, or continue to process the blended material into products at 220°C with HAAK MiniJet micro injection molding machine.

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Abstract

The present invention discloses a super-tough high heat resistant polylactic acid / elastomer blended material or an article, which is prepared by melting and blending or further processing and molding the following components: 75 to 99 parts of poly-L-lactic acid or poly-D-lactic acid, 1 to 25 parts of third component poly-D-lactic acid or poly-L-lactic acid, and elastomer accounting to 5-30wt% of the total amount of the polylactic acid, the crystallinity of the obtained blended material or article is 43-53%, the heat resistant temperature is 113.5-140.5 DEG C, and notch impact strength is 20.5-93.3kJ / m<2>. By use of the characteristic of easy stereocomplexing of chiral polylactic acid molecules, stereocomplex crystals are formed in suit in a melt from small amount of third component molecular chains and matrix molecular chains, on the one hand the stereocomplex crystals can be used as a rheology modifier to change the dispersion state of the elastomer in a matrix to improve the toughening efficiency of the elastomer on the matrix, and on the other hand the stereocomplex crystals can be used as a nucleating agent to greatly accelerate matrix crystallization. The method is not only ingenious in design, but also provides an effective and simple way for the development of super-tough high heat-resistant polylactic acid blended materials or articles.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and their preparation, and in particular relates to a super-tough and high-heat-resistant polylactic acid / elastomer blend material or product and a preparation method thereof. Background technique [0002] Due to the advantages of light weight, good flexibility, low price, and easy processing and molding, polymer materials are widely used in various fields of the national economy and in all aspects of people's lives. However, the synthetic raw materials of traditional polymer materials mainly come from petrochemical resources, and it is difficult to degrade quickly in the natural environment after use. Resource-based, biodegradable polymer materials to replace traditional petroleum-based polymers have attracted great attention from academia and industry around the world. [0003] Among the many bio-based biodegradable polymer materials that have been developed, polylactic acid (PLA) is ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L75/04C08L67/02C08L23/08
Inventor 白红伟傅强刘振伟张琴陈枫王珂邓华
Owner SICHUAN UNIV
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