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A kind of transparent heat-resistant polylactic acid composition and its preparation method

A technology of polylactic acid and composition, applied in the field of transparent heat-resistant polylactic acid composition and its preparation, can solve the problems of precipitation and high addition of plasticizer, and achieve the effects of high transparency, fast crystallization rate and strong controllability

Active Publication Date: 2022-03-29
SHANTOU SAMMA PLASTIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although plasticizers can promote the motility of polylactic acid molecular chains, thereby increasing the crystallization rate of polylactic acid, the amount of plasticizer added is often high, and there is a risk of precipitation

Method used

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  • A kind of transparent heat-resistant polylactic acid composition and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, the preparation method of this transparent heat-resistant polylactic acid composition includes the following steps in sequence:

[0034] (1) Preparation of long-chain branched polylactic acid:

[0035] (1-1) Prepare the following raw materials by weight: the second part of polylactic acid 97.9%, di-(tetradecyl) peroxydicarbonate 1.2%, antioxidant 168 0.9%;

[0036] (1-2) Dry the second part of polylactic acid at 110°C for 50 minutes, and cool to 25°C;

[0037] (1-3) adding di-(tetradecyl) peroxydicarbonate and antioxidant 168 to the second part of polylactic acid, and mixing evenly to obtain the first mixed material;

[0038] (1-4) Melt and extrude the first mixed material obtained in step (3) through the first twin-screw extruder, and carry out stranding, air cooling, and cutting of the material extruded by the first twin-screw extruder Particles to obtain granular long-chain branched polylactic acid;

[0039] (2) Preparation of transparent heat-...

Embodiment 2

[0048] In this embodiment, the preparation method of this transparent heat-resistant polylactic acid composition includes the following steps in sequence:

[0049] (1) Preparation of long-chain branched polylactic acid:

[0050](1-1) Prepare the following raw materials by weight: the second part of polylactic acid 98.24%, di-(tetradecyl) peroxydicarbonate 1.00%, antioxidant 168 0.76%;

[0051] (1-2) Dry the second part of polylactic acid at 100°C for 30 minutes, and cool to 20°C;

[0052] (1-3) adding di-(tetradecyl) peroxydicarbonate and antioxidant 168 to the second part of polylactic acid, and mixing evenly to obtain the first mixed material;

[0053] (1-4) Melt and extrude the first mixed material obtained in step (3) through the first twin-screw extruder, and carry out stranding, air cooling, and cutting of the material extruded by the first twin-screw extruder Particles to obtain granular long-chain branched polylactic acid;

[0054] (2) Preparation of transparent hea...

Embodiment 3

[0063] In this embodiment, the preparation method of this transparent heat-resistant polylactic acid composition includes the following steps in sequence:

[0064] (1) Preparation of long-chain branched polylactic acid:

[0065] (1-1) Prepare the following raw materials by weight: the second part of polylactic acid 97.90%, di-(tetradecyl) peroxydicarbonate 1.20%, antioxidant 168 0.90%;

[0066] (1-2) Dry the second part of polylactic acid at 120°C for 70 minutes, and cool to 30°C;

[0067] (1-3) adding di-(tetradecyl) peroxydicarbonate and antioxidant 168 to the second part of polylactic acid, and mixing evenly to obtain the first mixed material;

[0068] (1-4) Melt and extrude the first mixed material obtained in step (3) through the first twin-screw extruder, and carry out stranding, air cooling, and cutting of the material extruded by the first twin-screw extruder Particles to obtain granular long-chain branched polylactic acid;

[0069] (2) Preparation of transparent he...

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Abstract

A transparent heat-resistant polylactic acid composition is characterized in that it is made of the following raw materials in weight ratio: the first part of polylactic acid 20-80%; long-chain branched polylactic acid 80-20%; wherein, long-chain branched polylactic acid It is made of the following raw materials in the weight ratio: the second part of polylactic acid 93.9-99.2%; dicarbonate organic peroxide 0.5-2.5%; phosphite antioxidant 0.3-3.6%. The present invention also provides a preparation method of the above-mentioned transparent heat-resistant polylactic acid composition. The invention utilizes phosphite antioxidants in cooperation with dicarbonate organic peroxides to induce polylactic acid to undergo melting free radical reaction, and the prepared long-chain branched polylactic acid has high branching degree characteristics and good crystallization self-nucleation And its gel content is low, does not produce "fish eye" defect, thus will not affect the aesthetics of transparent polylactic acid products; the transparent heat-resistant polylactic acid composition of the present invention has high transparency, fast crystallization rate, heat resistance Good and good processing performance.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a transparent heat-resistant polylactic acid composition and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of e-commerce (especially online shopping and takeaway), it has greatly promoted the vigorous development of disposable plastic products such as plastic express bags. However, the current disposable plastic products are non-degradable and costly to recycle, which makes their wastes cause serious "white pollution" and cause serious damage to the earth's ecological environment, especially the marine ecosystem. Recently, it has been reported that plastic particles have entered the biological cycle and have appeared in human feces. In addition, the vast majority of traditional polymer materials come from non-renewable petrochemical resources, which not only exacerbates the problem of "shortage of petroleum reso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K5/14C08K5/526
CPCC08L67/04C08L2201/08C08L2205/025C08L2201/10C08K5/14C08K5/526
Inventor 张晓智李鹏詹卡斯
Owner SHANTOU SAMMA PLASTIC IND CO LTD
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