A kind of preparation method of polylactic acid composite material and product

A composite material, polylactic acid technology, applied in coatings and other directions, can solve problems such as poor heat resistance and mechanical properties, complex product production steps, etc., to improve heat resistance and mechanical properties, improve molding quality and molding efficiency, The effect of easy molding and demolding

Active Publication Date: 2021-05-28
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the above, the purpose of the present invention is to provide a polylactic acid composite material and a preparation method for its products, so as to solve the technical problems of poor heat resistance and mechanical properties and complex production steps of the products in the prior art.

Method used

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  • A kind of preparation method of polylactic acid composite material and product
  • A kind of preparation method of polylactic acid composite material and product
  • A kind of preparation method of polylactic acid composite material and product

Examples

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Embodiment 1

[0043] This embodiment provides a polylactic acid composite material, which includes the following components in parts by weight:

[0044]

[0045] Such as figure 1 As shown, the preparation method of the polylactic acid composite product provided in this embodiment includes the following steps:

[0046] S1. Add polylactic acid, starch, glass microspheres, glycerin, colorants and antioxidants into a stirred tank at a temperature of 80°C, and stir for 0.5h until they are evenly mixed. Then the temperature in the stirred tank was kept at 80° C., and the mixed product was dried in the stirred tank for 4 hours.

[0047] S2. Put the product obtained in step S1 into an extruder for extrusion and granulation. The temperature of the five temperature zones from the feed end to the discharge end of the extruder is 160°C, 180°C, 180°C, 180°C, and 180°C. The screw speed is 50r / min, and the feeding speed is 3r / min. Then the granules obtained by granulation were dried, the drying tem...

Embodiment 2

[0050] The difference between this embodiment and the first embodiment lies in that the parts by weight of the components in the polylactic acid composite material are different. Specifically, the polylactic acid composite material provided in this embodiment includes the following components in parts by weight:

[0051]

[0052] The preparation method of the polylactic acid composite product provided in this example is the same as that in Example 1, and the polylactic acid composite product is prepared.

Embodiment 3

[0054] Likewise, the difference between this embodiment and the first embodiment lies in that the parts by weight of the components in the polylactic acid composite material are different. Specifically, the polylactic acid composite material provided in this embodiment includes the following components in parts by weight:

[0055]

[0056] The preparation method of the polylactic acid composite product provided in this example is the same as that in Example 1, and the polylactic acid composite product is prepared.

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Abstract

A preparation method of polylactic acid composite material and products. The invention relates to the technical field of polymer materials, and discloses a polylactic acid composite material, which comprises, in parts by weight, 50-90 parts of polylactic acid, 5-25 parts of glass microspheres, 5-25 parts of starch, 1-6 parts of glycerin, 2-5 parts of coloring agent and 1-3 parts of antioxidant. The polylactic acid composite material provided by the invention can remarkably improve heat resistance and mechanical properties. The invention also discloses a preparation method of a polylactic acid composite material product, comprising: S1. adding polylactic acid, starch, glass microspheres and glycerin into a stirring tank, and stirring until uniformly mixed; S2. mixing the product obtained in step S1 Add in the extruder, extrude and granulate; S3. add the product that step S2 obtains in the injection molding machine that the temperature of mould can be adjusted, carry out injection molding, and the temperature of mold increases first and then reduces when holding pressure, to Products are annealed. In the preparation method of the polylactic acid composite product provided by the invention, the product can be annealed in the injection mold.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of polylactic acid composite materials and products. Background technique [0002] Polylactic acid is a polymer obtained by polymerizing lactic acid as the main raw material. Because the production process of polylactic acid is non-polluting and biodegradable, it has been widely used in injection molding and other fields. [0003] However, the existing polylactic acid has poor heat resistance, mechanical properties and formability. In addition, the existing polylactic acid products usually need to be put into special annealing equipment for annealing treatment after being formed and released from the mold, and this annealing method not only needs to increase the equipment cost, but also has complicated production steps and low production efficiency. [0004] Therefore, there is an urgent need for a novel polylactic acid material and a method for p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L3/02C08K7/20C08K5/053B29C45/00B29C71/02
CPCB29C45/0001B29C71/02B29C2071/022C08L67/04C08L2201/06C08L2201/08C08L3/02C08K7/20C08K5/053
Inventor 李潘俊璟李熹平李一鹏杨文杰张敏陈光逸宫宁宁
Owner ZHEJIANG NORMAL UNIVERSITY
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