Polylactic acid foamed material and preparation method thereof

A technology of microcellular foaming material and polylactic acid, which is applied in the field of polylactic acid foaming material and its preparation, can solve the problems of high opening rate, large cell size, and unevenness, and achieve high closed cell rate and high cell density. The effect of small size and uniform cell size

Active Publication Date: 2012-09-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to overcome the technical problems of large and uneven cell size and high open cell rate in existing prod...

Method used

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  • Polylactic acid foamed material and preparation method thereof
  • Polylactic acid foamed material and preparation method thereof
  • Polylactic acid foamed material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Raw material: polylactic acid, 2002D, Natureworks company, D-isomer content is 4%, melt flow rate is 3.0g / 10min.

[0037] Polybutylene succinate, HX-E201, Anqing Hexing Chemical Co., Ltd. Talc powder, 1250 mesh, Beijing Liguoweiye Powder Material Co., Ltd. Glyceryl monostearate was purchased from Shenyang Kerui Chemical Co., Ltd. Carbon dioxide, purity 99.5%, Beijing Oxygen Factory.

[0038] Foaming process: weigh polylactic acid, polybutylene succinate, talcum powder and glyceryl monostearate according to a certain ratio (as shown in Table 1), and mix them uniformly in a high-speed mixer. The mixed material is fed into the rotating twin-screw extruder, and a certain proportion of carbon dioxide is pumped into the polymer melt in the extruder through the metering pumping system. Under the rotation of the screw, the injected carbon dioxide and polylactic acid resin melt form a homogeneous solution, which is transported to the outlet of the machine head. The outlet of ...

Embodiment 2-3

[0042] The foaming process using the same raw material as in Example 1 is different in that the ratio of each component in the raw material is different, and the head pressure is different.

Embodiment 3

[0043] The foamed sheet obtained in Example 3 was heat-treated in an oven at 100°C for 60 seconds, and the obtained sample was measured by DSC for its melting exothermic peak at a rate of 10°C / min. The melting enthalpy of 93J / g indicates the degree of crystallinity. The properties of the foamed material obtained are shown in Table 1.

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Abstract

The invention relates to a polylactic acid foamed material and a preparation method thereof. The invention solves the technical problems of large pore size, nonuniformity and high porosity in the existing product. The polylactic acid foamed material is prepared by an extrusion foaming method. The polylactic acid foamed material comprises polylactic acid, at least one biodegradable polyester (selected from poly(butylenes succinate), polyhydroxybutyrate, polycaprolactone and copolymer or blend thereof), a physical foaming agent, and at least one processing assistant for foaming. The apparent density of the microporous foamed sheet is 0.05-0.5g/cm<3>, the average pore diameter is not greater than 100 micrometers, and the porosity is not greater than 10%. The invention is mainly used in the fields of food packaging, automobile industry and the like.

Description

technical field [0001] The invention relates to a polymer foam material and a preparation method thereof, in particular to a polylactic acid foam material and a preparation method thereof. Background technique [0002] Foam plastic is a high polymer / gas composite material with superior performance, which has excellent properties such as light weight, impact energy absorption, and good heat and sound insulation. However, traditional foam plastics such as polyethylene, polypropylene, polystyrene, etc. are made of non-renewable petroleum resources, and they can hardly be decomposed in the natural environment after use. After incineration, a large amount of toxic and harmful substances are produced, causing environmental pollution. . In order to solve these problems, there is an urgent need for a foam plastic that can have the same performance as traditional foam plastics and can be completely biodegradable. [0003] Polylactic acid is a biodegradable polymer material with exc...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08J9/12B29C47/92B29C48/92
Inventor 信春玲何亚东李庆春闫宝瑞李刚
Owner BEIJING UNIV OF CHEM TECH
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