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Polylactic acid composition containing carboxylate nucleating agent and preparation method thereof

A technology of nucleating agent and carboxylate, which is applied in the field of polylactic acid composition containing carboxylate nucleating agent and its preparation, can solve the problems of slow crystallization rate, difficult crystallization, poor heat resistance of polylactic acid, etc., and achieve the goal of preparing The process is simple and easy to operate, the interface free energy is reduced, and the effect of rapid crystallization is good.

Active Publication Date: 2021-11-02
湖南玥昇杰科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, polylactic acid has disadvantages such as poor heat resistance, and the glass transition temperature of polylactic acid products obtained by various molding methods is only 55-65°C, which is difficult to meet the practical application
After crystallization, its heat distortion temperature can be increased to above 100°C. However, although polylactic acid is a crystalline polymer, it is difficult to fully crystallize in the actual molding process due to its slow crystallization rate.
[0004] Carboxylate nucleating agent is one of the earliest researched polypropylene nucleating agents. Generally speaking, the carboxylic acid group itself has no nucleating ability, but carboxylate has the ability to induce polymer crystallization, and different carboxylic acid There are also certain differences in the nucleating ability of salts; dicarboxylic acid salts are widely used in polypropylene, but less used in polylactic acid. The reason is that dicarboxylic acid salt nucleating agents induce polylactic acid The ability to crystallize is relatively insufficient compared to polypropylene

Method used

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  • Polylactic acid composition containing carboxylate nucleating agent and preparation method thereof
  • Polylactic acid composition containing carboxylate nucleating agent and preparation method thereof
  • Polylactic acid composition containing carboxylate nucleating agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A carboxylate nucleating agent is synthesized by the following method:

[0029] Under the condition of stirring at a speed of 200r / min, dissolve 1mol of acid anhydrides in 275g of DMF solvent, then add 4mol of potassium hydroxide into the above solution in four batches in equal amounts, and at a temperature of 50°C, The reaction was carried out for 3 hours. After the reaction, the reaction product was washed with absolute ethanol and vacuum-dried to obtain a carboxylate nucleating agent.

[0030] The reaction process is as follows:

[0031]

Embodiment 2

[0033] A carboxylate nucleating agent is synthesized by the following method:

[0034] Under the condition of stirring at a rotational speed of 200r / min, dissolve 1mol of acid anhydrides in 350g of DMAC solvent, then add 4mol of potassium hydroxide into the above solution in four batches in equal amounts, and at a temperature of 70°C, The reaction was carried out for 5 hours. After the reaction, the reaction product was washed with absolute ethanol and vacuum-dried to obtain a carboxylate nucleating agent.

[0035] The reaction process is as follows:

[0036]

Embodiment 3

[0038] A carboxylate nucleating agent is synthesized by the following method:

[0039] Under the condition of stirring at a speed of 200r / min, dissolve 1 mol of acid anhydrides in 430g of NMP solvent, then add 4 mol of potassium hydroxide into the above solution in equal amounts in four batches, and at a temperature of 90°C, carry out The reaction was carried out for 6 hours. After the reaction, the reaction product was washed with absolute ethanol and vacuum-dried to obtain a carboxylate nucleating agent.

[0040] The reaction process is as follows:

[0041]

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Abstract

The invention relates to a polylactic acid composition containing a carboxylate nucleating agent and a preparation method thereof, and belongs to the technical field of polylactic acid processing, the raw materials comprise the carboxylate nucleating agent, an antioxidant, an anti-hydrolysis agent and L-polylactic acid, and the polylactic acid composition is prepared by mixing the raw materials through a high-speed mixer and carrying out twin-screw extrusion granulation. In the preparation process, by using anhydride substances and potassium hydroxide as raw materials and reacting in an aprotic solvent, the anhydride substances are synthesized into a carboxylate nucleating agent containing four carboxylate groups, the carboxylate nucleating agent is uniformly dispersed in a polylactic acid melt in the form of extremely tiny solid particles to serve as heterogeneous crystal nucleuses, the interface free energy required by polylactic acid nucleation crystallization is reduced, so that polylactic acid chain segments are promoted to crystallize simultaneously by taking the crystal nucleus as the center, and the aim of improving the crystallization rate and crystallinity of polylactic acid is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid processing, and in particular relates to a polylactic acid composition containing a carboxylate nucleating agent and a preparation method thereof. Background technique [0002] Polylactic acid is a type of polyester, and lactic acid is a naturally occurring biomonomer. Polylactic acid is thermoplastic and can be processed by the production process of general plastics, such as making films, sheets and fibers. It is a bio-based degradable material with broad application prospects. [0003] However, polylactic acid has disadvantages such as poor heat resistance, and polylactic acid products obtained by various molding methods have a glass transition temperature of only 55-65°C, which is difficult to meet practical applications. After crystallization, its heat distortion temperature can be increased to above 100°C. However, although polylactic acid is a crystalline polymer, it is difficult to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L79/00C08K5/098C07C51/41C07C65/34C07C63/331C07C65/24
CPCC08L67/04C07C51/412C08L2205/24C08L79/00C08K5/098C07C65/34C07C63/331C07C65/24
Inventor 曾广胜夏桂英胡灿孟聪江太君彭军
Owner 湖南玥昇杰科技有限责任公司
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