High-fluidity polylactic acid-based wood-plastic injection molding composite material and preparation method thereof

A composite material and high fluidity technology, applied in the field of degradable polylactic acid-based wood-plastic composite materials, can solve problems such as poor interface compatibility, achieve favorable processing and molding, reduce burning, and simple operation

Inactive Publication Date: 2016-03-02
贵州华锐达环保装饰材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a polylactic acid-based wood-plastic injection molding composite material with high fluidity and its preparation method, the purpose of which is to solve the problem of poor interfacial compatibility existing between wood fibers and degradable resins, Use microwave radiation to initiate grafting of glycidyl methacrylate and polylactic acid to prepare corresponding compatibilizers to improve the mechanical and processing flow properties of composite materials, and improve the material quality of polylactic acid-based wood-plastic composites when the wood fiber content is high. The fluidity of the melt makes it easy for injection molding

Method used

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  • High-fluidity polylactic acid-based wood-plastic injection molding composite material and preparation method thereof
  • High-fluidity polylactic acid-based wood-plastic injection molding composite material and preparation method thereof
  • High-fluidity polylactic acid-based wood-plastic injection molding composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of a graft copolymer of polylactic acid-glycidyl methacrylate: add 20 g of dried polylactic acid into a flask containing 100 mL of DMF, feed nitrogen, and add 2 g of glycidyl methacrylate and 0.1 g DCP initiator. The reaction was placed in a microwave reactor with a microwave power of 400W, and the reaction was stirred for 10 minutes. Precipitate with ethanol, filter and dry to obtain the compatibilizer.

[0030] Mix poplar wood fiber (80-mesh poplar wood powder, the same below), polylactic acid, polycaprolactone, lubricant and compatibilizer according to the mass ratio of 50 / 50 / 10 / 1 / 10, add the twin-screw In the silo of the extruder, the temperature of the screw is set to 170° C., and the rotational speed of the screw is 150 rpm. The extrudate is cooled and pelletized to obtain composite material particles.

Embodiment 2

[0032] The preparation method of the graft copolymer of polylactic acid-glycidyl methacrylate: add 20 g of dried polylactic acid into a flask containing 120 mL of DMF, blow nitrogen into the system, and add 4 g of glycidyl methacrylate and 0.15 g of DCP Initiator. The reaction was placed in a microwave reactor with a microwave power of 600W, and the reaction was stirred for 15 minutes. Precipitate with ethanol, filter and dry to obtain the compatibilizer.

[0033] Poplar wood fiber, polylactic acid, polycaprolactone, lubricant and compatibilizer are mixed according to the ratio of 50 / 50 / 10 / 1 / 5 by mass, and added to the silo of the twin-screw extruder, and the screw temperature is set to 195°C, screw speed 280rpm. The extrudate is cooled and pelletized to obtain composite material particles.

Embodiment 3

[0035]A preparation method of a graft copolymer of polylactic acid-glycidyl methacrylate: a preparation method of a graft copolymer of polylactic acid-glycidyl methacrylate: add 20 g of dried polylactic acid into a flask containing 80 mL of DMF , nitrogen gas was passed into the system, and 1.5 g of glycidyl methacrylate and 0.15 g of BPO initiator were added to the system. The reaction was placed in a microwave reactor with a microwave power of 400W, and the reaction was stirred for 12 minutes. Precipitate with ethanol, filter and dry to obtain the compatibilizer.

[0036] Poplar wood fiber, polylactic acid, polycaprolactone, lubricant and compatibilizer are mixed according to the ratio of 50 / 45 / 5 / 2 / 13 by mass, and added to the silo of the twin-screw extruder, and the screw temperature is set to 180°C, screw speed 260rpm. The extrudate is cooled and pelletized to obtain composite material particles.

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Abstract

The invention discloses a high-liquidity polylactic acid-based wood plastic injection molding composite material and a preparation method thereof. The high-liquidity polylactic acid-based wood plastic injection molding composite material is characterized by comprising the following components in parts by weight: 10-60 parts of poplar fibers, 30-80 parts of polylactic acid, 5-10 parts of polycaprolactone, 0.5-2 parts of a lubricant and 5-20 parts of a bulking agent, wherein the bulking agent is a grafted copolymer obtained by microwave-radiation-induced polymerization of polylactic acid and glycidyl methacrylate. The preparation method of the high-liquidity polylactic acid-based wood plastic injection molding composite material comprises the following process steps: (1), preparing raw materials; (2), preparing the bulking agent; and (3), preparing composite material particles. The preparation method has the advantages of simple and convenient operation, no toxicity and environment friendliness; and the prepared composite material has the advantages of high liquidity, convenience in injection molding, and the like.

Description

technical field [0001] The invention relates to a polylactic acid-based wood-plastic injection molding composite material with high fluidity and a preparation method thereof, in particular to a degradable polylactic acid-based wood-plastic composite material with high fluidity prepared by using a macromolecular compatibilizer and suitable for injection molding Methods. Background technique [0002] Polylactic acid (PLA) has significant advantages such as good thermal stability, excellent physical and mechanical strength, complete biodegradability and biocompatibility, and is widely used in industrial packaging, fibers, textiles and garments, biomedical engineering products and other fields . Due to the wide source of plant fiber and its environmental friendliness, the use of plant fiber and other biomass materials to blend with polylactic acid has attracted the attention of many scholars. The addition of plant fibers can reduce the proportion of polylactic acid in the comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L97/02C08L51/08C08J5/10C08F283/02C08F220/32C08F2/46C08F4/34B29B9/06B29C47/92B29C48/92
Inventor 金立维谢振华储富祥王春鹏
Owner 贵州华锐达环保装饰材料有限公司
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