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Polylactic acid base composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of polymers, can solve the problems of large spherulite size, poor tear strength, lack of branched chain structure, etc.

Active Publication Date: 2014-12-24
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the currently prepared polylactic acid has a linear molecular structure and lacks a branched chain structure, the melt strength of polylactic acid itself is low, and it is difficult to stably blow molding.
At the same time, due to the slow crystallization speed of polylactic acid and the large size of spherulites, the material is hard and brittle, its tear strength is poor, and its elongation at break is less than 5%.
The above-mentioned defects of polylactic acid hinder its application range, especially the development and application in the field of film products

Method used

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  • Polylactic acid base composite material and preparation method thereof
  • Polylactic acid base composite material and preparation method thereof
  • Polylactic acid base composite material and preparation method thereof

Examples

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preparation example Construction

[0042] The preparation method of the polylactic acid-castor oil copolymer described in the present application can be prepared according to the following method: under the action of a catalyst, castor oil and lactide are mixed, and the polylactic acid-castor oil copolymer is obtained after reaction. In the above-mentioned process of preparing polylactic acid-castor oil copolymer, the catalyst is preferably stannous octoate. The above reaction is a process in which castor oil initiates the bulk polymerization of lactide, the temperature of the polymerization is preferably 120°C-135°C, and the time of the polymerization is preferably 10-20h. The mass ratio of the castor oil to the lactide is preferably (1-5): 10, and the amount of the catalyst added is 0.1wt% to 0.5wt% of the total amount of the castor oil and the lactide . In order to fully dissolve the castor oil, as a preferred option, the castor oil is first refluxed with toluene to remove water. The number average molecul...

Embodiment 1

[0060] The preparation of embodiment 1 polylactic acid-castor oil copolymer

[0061] Castor oil and toluene are refluxed to remove water, and then toluene is removed to obtain dry castor oil; 100 g of lactide crystallization is purified, dried, and packed into a reactor; 30 grams of dry castor oil is added, and under the condition of magnetic stirring, Mix well at 100-120°C; add 0.5% catalyst stannous octoate, react at 120-130°C for more than 10 hours to obtain a white solid product, and obtain polylactic acid-castor oil copolymer by sedimentation. The molecular weight of the copolymer measured by GPC was 6300 g / mol. figure 1 Be the HNMR curve figure of the final reaction product of this embodiment, according to figure 1 It was confirmed that the reaction product was a polylactic acid-castor oil copolymer.

Embodiment 2

[0062] The preparation of embodiment 2 polylactic acid-polyurethane

[0063] Firstly, polylactic acid with a molecular weight of 15000g / mol was prepared by ring-opening polymerization with isopropanol as an initiator. Take 45g polylactic acid and 10g hexamethylene diisocyanate to fully react at 80-120°C; 180g castor oil and 10g hexamethylene diisocyanate react at 50-80°C for 5-10 hours to obtain a polyurethane prepolymer; The reaction product of polylactic acid and hexamethylene diisocyanate is slowly added dropwise to the polyurethane prepolymer, the reaction temperature is 80-100°C, and the reaction time is 5-10 hours to obtain the polylactic acid-polyurethane copolymer. The molecular weight of the copolymer measured by GPC was 60000 g / mol. figure 2 Be the HNMR curve figure of the final reaction product of this embodiment, according to figure 2 It was confirmed that the reaction product was a polylactic acid-polyurethane copolymer.

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Abstract

The invention discloses a polylactic acid base composite material prepared by 50.0wt%-80.0wt% of polylactic acid, 5.0wt%-20.0wt% of polylactic acid-castor oil copolymer, 5.0et%-30.0wt% of polylactic acid-polyurethane copolymer. The polylactic acid-castor oil copolymer and the polylactic acid-polyurethane copolymer with branched or hyperbranched structure are guided in the polylactic acid resin for obviously improving the melt strength of the polylactic acid, realizing stable blow molding machining and raising the processing ability of the polylactic acid base composite material; the branched structure and the toughness polyurethane can raise the mechanical property of the polylactic acid base composite material product. According to the experimental result, the tearing strength of the composite material product is greater than 20MPa, the elongation at break is greater than 100%, and the thickness of the film is controllable in the range of 20 microns to 50 microns. The preparation method for polylactic acid base composite material is also provided.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a polylactic acid-based composite material and a preparation method thereof. Background technique [0002] The environmental problems caused by the widespread use of plastic products, especially plastic film products, and the increasingly urgent problem of fossil resources have attracted worldwide attention. The development and use of biomass resources and fully biodegradable polymer materials to replace petroleum-based plastics has become a current research hotspot. [0003] Among the biodegradable polymers, polylactic acid is extremely important as the biodegradable polymer plastic with the largest industrialization scale and the most cost-effective. Polylactic acid can be prepared from biomass resource plant starch. It has excellent biodegradability and is finally decomposed into carbon dioxide and water in the environment, which is non-polluting to the environment. Moreove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/06C08L75/06
Inventor 黄绍永陈学思李杲边新超
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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