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Preparation method and application of novel modified polylactic acid

A polylactic acid and modification technology, which is applied in the field of preparation of new modified polylactic acid, can solve the problems of film bubble instability, low melt strength, hardening, etc., and achieve the effect of promoting environmental protection and improving mechanical and optical properties

Pending Publication Date: 2022-01-25
浙江播下环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the lack of long-chain branches in the polylactic acid molecular chain, the melt strength is particularly low, and the strain hardening is insufficient, resulting in unstable and easy rupture of the film bubble when the polylactic acid is blown.
In thermoforming, for polylactic acid, a hard and brittle polymer with very low melt strength, the forming process can only be carried out in a narrow temperature range, and the product quality is poor

Method used

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  • Preparation method and application of novel modified polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation method of novel modified polylactic acid, comprises the steps:

[0027] Step 1. Weigh L-lactide and ε-caprolactone according to the molar ratio of 1:2.5, put them into a two-necked flask, and then add stannous isooctanoate with a total mass fraction of 0.1% as a catalyst. The reaction was carried out under nitrogen atmosphere for 24 h to obtain the crude product. Dissolve the crude product in chloroform at room temperature, add methanol solution to precipitate, repeat the purification 3 times and place it in a vacuum oven at 50°C to dry to obtain the final product grafted caprolactone-lactic acid copolymer;

[0028] Step 2. Weigh 1 g of the caprolactone-lactic acid copolymer obtained in step 1 and 99 g of polylactic acid, and use a torque rheometer to perform melt blending, and blend for 5 min at 180 ° C and a speed of 50 r / min to obtain a blend ;

[0029] Step 3. Vacuum-dry 99.5 g of the blend obtained in Step 2 and 0.5 g of long-lasting lumines...

Embodiment 2

[0031] A kind of preparation method of novel modified polylactic acid, comprises the steps:

[0032] Step 1. Weigh L-lactide and ε-caprolactone according to the molar ratio of 1:2.6, put them into a two-necked flask, and then add stannous isooctanoate with a total mass fraction of 0.2% as a catalyst, at 110°C, The reaction was carried out under nitrogen atmosphere for 21 h to obtain the crude product. Dissolve the crude product in chloroform at room temperature, add methanol solution to precipitate, repeat the purification 4 times and place it in a vacuum oven at 60°C to dry to obtain the final product grafted caprolactone-lactic acid copolymer;

[0033] Step 2. Weigh 5 g of caprolactone-lactic acid copolymer and 95 g of polylactic acid obtained in step 1, melt blend them with a torque rheometer, and blend them for 6 minutes at 185 ° C and a speed of 50 r / min to obtain a blend ;

[0034] Step 3. Vacuum-dry 99.5 g of the blend obtained in Step 2 and 0.5 g of long-lasting lumi...

Embodiment 3

[0036] A kind of preparation method of novel modified polylactic acid, comprises the steps:

[0037] Step 1. Weigh L-lactide and ε-caprolactone according to the molar ratio of 1:2.5, put them into a two-necked flask, and then add stannous isooctanoate with a total mass fraction of 0.17% as a catalyst. The reaction was carried out under nitrogen atmosphere for 22 h to obtain the crude product. Dissolve the crude product in chloroform at room temperature, add methanol solution to precipitate, repeat the purification 4 times, and place it in a vacuum oven at 50°C to dry to obtain the final product grafted caprolactone-lactic acid copolymer;

[0038] Step 2. Weigh 10 g of the caprolactone-lactic acid copolymer and 90 g of polylactic acid obtained in step 1, melt blend them using a torque rheometer, and blend them for 8 minutes at 190°C and a speed of 50 r / min to obtain a blend ;

[0039] Step 3. Vacuum-dry 98 g of the blend obtained in Step 2 and 2 g of long-lasting luminous pow...

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Abstract

The invention discloses a preparation method of novel modified polylactic acid. The preparation method comprises the following steps: step 1, synthesizing a grafted caprolactone-lactic acid copolymer based on ring opening polymerization under the action of a catalyst by taking L-lactide and epsilon-caprolactone as raw materials; step 2, carrying out melt blending on the grafted caprolactone-lactic acid copolymer and polylactic acid in a torque rheometer to prepare a blend; and step 3, adding long-afterglow luminescent powder into the blend, carrying out uniform dry mixing, and carrying out melt mixing in an extruder to prepare the novel modified polylactic acid. Through the arrangement, the mechanical properties of the polylactic acid are improved, and the performance of the packaging material is met. The invention also discloses application of the novel modified polylactic acid prepared by the preparation method of the novel modified polylactic acid in preparation of packaging materials, anti-counterfeiting plastics and polylactic acid cast films.

Description

technical field [0001] The invention relates to the field of degradable plastic products, in particular to a preparation method and application of a novel modified polylactic acid. Background technique [0002] Polylactic acid is derived from biomass resources such as corn and sucrose, and has the characteristics of complete biodegradability and biocompatibility. Compared with other degradable materials such as polycaprolactone, polybutylene succinate, and polyhydroxyalkanoate And polybutylene terephthalate / adipate, etc., polylactic acid has the advantages of the largest production capacity, the lowest price, the best comprehensive performance and the widest application field. In recent years, the application field of polylactic acid has gradually expanded from the medical field to daily necessities, office supplies, school supplies, electronic products, automotive interior parts, 3D printing, textile products, disposable tableware, packaging products, agricultural mulch, sh...

Claims

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Application Information

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IPC IPC(8): C08G67/04C08K3/22
CPCC08G67/04C08L2201/06C08L2203/16C08L2205/025C08K3/22
Inventor 吴伟张玉建安孝善
Owner 浙江播下环保科技有限公司
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