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Efficient polylactic acid nucleating agent, and preparation method and application thereof

A technology of nucleating agent and polylactic acid, which is applied in the field of polylactic acid crystallization modification, can solve the problems of human body and environmental hazards and involvement, and achieve the effects of improving molding processing type, improving heat resistance, and remarkable nucleating effect

Active Publication Date: 2012-07-18
新倍斯(杭州)材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these organic nucleating agents have good nucleating effects, the preparation process involves aromatic compounds containing benzene rings, which will cause certain harm to the human body and the environment.

Method used

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  • Efficient polylactic acid nucleating agent, and preparation method and application thereof
  • Efficient polylactic acid nucleating agent, and preparation method and application thereof
  • Efficient polylactic acid nucleating agent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Utilize zinc acetate to prepare the method for zinc citrate complex nucleating agent: 2.20g (0.01 mole) zinc acetate is dissolved in the mixed solution of 75 milliliters of ethanol and 3 milliliters of distilled water, stirred and refluxed 3 hours in 80 ℃ of water baths, then to Add 2.10g (0.01 mole) citric acid in the solution, continue reaction 3.5 hours, naturally cool to room temperature after reaction finishes, suction filtration, filter cake are washed 3 times with ethanol and water, obtain white powder after drying, fusing point (decomposition temperature) is 307°C.

[0024] The above-prepared nucleating agent and polylactic acid (with a number average molecular weight of 93,000) were dried in a vacuum oven at 70° C. for 10 hours. In terms of parts by mass, 99.8 parts of polylactic acid and 0.2 parts of nucleating agent were pre-mixed by a high-speed mixer, and then melt-kneaded and granulated with a SHJ-20 twin-screw extruder. The heating temperature of the fiv...

Embodiment 2

[0027] Weigh 99.5 parts of polylactic acid (the number average molecular weight is 93,000) and 0.5 part of the nucleating agent prepared in the above-mentioned Example 1, experience the same melt mixing and injection molding process in Example 1, and test the crystallization parameters and heat distortion temperature , see the result figure 1 , figure 2 and Table 1.

Embodiment 3

[0029] Weigh 99 parts of polylactic acid (the number average molecular weight is 93,000) and 1 part of the nucleating agent prepared in the above-mentioned Example 1, undergo the same melt mixing and injection molding process in Example 1, and test the crystallization parameters and heat distortion temperature , see the result figure 1 , figure 2 and Table 1.

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Abstract

The invention discloses an efficient polylactic acid nucleating agent, and a preparation method and application thereof and belongs to the technical field of crystallization and modification of polylactic acid. The prepared nucleating agent is a lamellar submicron zinc citrate complex, and is generated by heating zinc salt and citric acid in a mixed solution of water and ethanol and performing reflux reaction. A small amount of the nucleating agent and polylactic acid are mixed in advance and then are fused, blended and molded so as to obtain a polylactic acid product which is highly crystallized and has excellent heat resistance. The prepared nucleating agent has high safety for a human body and an obvious nucleating effect; and a process is simple and environment-friendly, the problems of low crystallization rate and heat resistance of the polylactic acid are solved, the forming processability of the polylactic acid product is improved, and a production cycle is shortened.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid crystallization modification, and in particular relates to a high-efficiency polylactic acid nucleating agent, its preparation method and its application in heat-resistant polylactic acid products. Background technique [0002] In recent years, with the massive consumption of petroleum resources and the widespread use of petroleum-based plastics, the resulting energy crisis and environmental pollution have become increasingly prominent. From the perspective of environmental protection and sustainable development, the development of renewable biodegradable polymer materials has become a very important direction in the research of new polymer materials. Among them, polylactic acid has become one of the varieties with the most development potential because of its outstanding performance. Polylactic acid is an aliphatic polyester synthesized by using renewable plant resources such as corn, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/41C08L67/04C08K5/098
Inventor 魏志勇宋平陈广义梁继才张万喜
Owner 新倍斯(杭州)材料科技有限公司
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