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High-performance stereocomplex polylactic acid/elastomer alloy material or product and preparation method thereof

An alloy material and elastomer technology, applied in the field of polylactic acid material and its preparation, can solve the problems of low toughening efficiency of PLA matrix, consumption of large petroleum resources, poor compatibility, etc., to achieve excellent melt stability characteristics and improve melt stability. the effect of improving compatibility

Active Publication Date: 2020-08-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, while synthetic polymers bring great convenience to human production and life, they also bring about two serious problems: the synthesis of traditional petroleum-based polymer materials not only needs to consume a large amount of limited petroleum resources, but also due to its It is difficult to degrade naturally after being discarded, causing serious pollution to the environment
However, the synthesis method of PLA with special topological structure is complicated and the yield is low. At present, the PLA in industrial production is still dominated by linear high molecular weight PLLA and PDLA. SC-PLA is significant
[0006] It is worth mentioning that although stereocombination can greatly improve the heat resistance and durability of PLA materials, it cannot effectively improve the brittleness of PLA.
Blending PLA with elastomers (or flexible polymers) is expected to obtain high-toughness PLA / elastomer alloy materials or products, but because the compatibility between the two is usually relatively poor, the interfacial interaction between the two phases is very weak. As a result, the toughening efficiency of the elastomer to the PLA matrix is ​​not high, and the toughness of the obtained alloy is generally poor

Method used

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  • High-performance stereocomplex polylactic acid/elastomer alloy material or product and preparation method thereof
  • High-performance stereocomplex polylactic acid/elastomer alloy material or product and preparation method thereof
  • High-performance stereocomplex polylactic acid/elastomer alloy material or product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The weight average molecular weight was 1.0×10 4 g / mol and 5.0×10 5 PLLA and PDLA with g / mol and optical purity of 92% and 99.5% respectively were vacuum-dried at 60°C until the water content was lower than 200ppm under a vacuum degree of less than 900Pa; Then mix it with 45 parts of PLLA, 45 parts of PDLA and 10 parts of E-GMA evenly; put the mixed material into the torque rheometer, melt and blend at a temperature of 210 ° C for 3 minutes, and granulate to obtain SC - Pellets of PLA / elastomer blend alloy. The obtained pellets had a degree of crystallinity of 35.8% and a melting temperature of 221°C.

[0039] The heat-resistant temperature of the product obtained by melting the above pellets at 240°C is 185°C, and the notched impact strength is 50.5kJ / m 2 .

Embodiment 2

[0041] The weight average molecular weight was 1.5×10 5 g / mol and 1.7×10 5 PLLA and PDLA with g / mol and optical purity of 98.5% and 99.5% respectively were vacuum-dried at 60°C until the moisture content was lower than 200ppm under a vacuum degree of less than 900Pa; Then it was stirred and mixed with 42.5 parts of PLLA, 42.5 parts of PDLA and 15 parts of E-MA-GMA; the mixture was added to the torque rheometer, melted and blended at a temperature of 200 ° C for 5 minutes, and granulated to obtain Pellets of SC-PLA / elastomer blend alloy. The obtained pellets had a degree of crystallinity of 42.5% and a melting temperature of 215°C.

[0042] The heat-resistant temperature of the product obtained by melting the above pellets at 240°C is 198°C, and the notched impact strength is 66.2kJ / m 2 .

Embodiment 3

[0044] The weight average molecular weight was 2.1×10 5 g / mol and 1.2×10 5 PLLA and PDLA with g / mol and optical purity of 98.5% and 99.5% respectively were vacuum-dried at 60°C until the moisture content was lower than 200ppm under a vacuum degree of less than 900Pa; Then it was mixed evenly with 37.5 parts of PLLA, 37.5 parts of PDLA and 25 parts of E-O-GMA; the mixed material was added to a torque rheometer, melted and blended at a temperature of 220 ° C for 7 minutes, and granulated to obtain SC- Pellets of PLA / elastomer blend alloy. The obtained pellets had a degree of crystallinity of 38.2% and a melting temperature of 223°C.

[0045] The heat-resistant temperature of the product obtained by melting the above pellets at 240°C is 188°C, and the notched impact strength is 69.3kJ / m 2 .

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Abstract

The invention discloses a preparation method for a high-performance steric composite type polylactic acid / elastomer alloy material or product. The preparation method comprises the following steps: completely dissolving a catalyst into absolute ethyl alcohol to obtain a mixture; uniformly mixing the mixture with elasatomer, L-polylactide and R-polylactide; and adding a material mixture into a melting mixer to co-mix and pelletize or re-melt and process, thereby obtaining the high-performance steric composite type polylactic acid / elastomer alloy material or product with excellent melting and stabilizing characteristics and heat resistance as well as high toughness. Though an efficient catalyst, part of a PLA molecular chain is grafted onto an elastomer molecular chain through coupling grafting reaction, so that compatibility with PLA is effectively improved, toughening efficiency is improved, and the obtained alloy material or product has excellent melting stabilizing characteristics, and therefore, multi-time melting processing can be performed. The preparation method is simple and efficient, and easily realizes large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid materials and their preparation, and in particular relates to the preparation of high-performance stereocomposite polylactic acid / elastomer alloy materials or products using reactive melt blending technology and a preparation method thereof. Background technique [0002] Since the 20th century, with the rapid development of the polymer industry at home and abroad, polymer materials have gradually been more and more widely used in various fields of the national economy because of their light weight, low price, good flexibility and many other advantages. However, while synthetic polymers bring great convenience to human production and life, they also bring about two serious problems: the synthesis of traditional petroleum-based polymer materials not only needs to consume a large amount of limited petroleum resources, but also due to its It is difficult to degrade naturally after being discar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L23/08
CPCC08L67/04C08L2205/025C08L2205/03C08L23/0884
Inventor 白红伟傅强邓世豪罗元林张琴
Owner SICHUAN UNIV
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