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Heat resistant polylactic acid composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of heat-resistant polylactic acid composite material and its preparation, can solve the problems of inability to meet high usage requirements, low efficiency, slow molding cycle, etc., and achieve rapid and continuous injection molding process and improved production efficiency. , the effect of fast crystallization

Active Publication Date: 2015-12-16
SHENZHEN LYUYI PACKAGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main production methods of polylactic acid knives, forks and spoons: one is the method of crystallization in the mold, which has a slow molding cycle and low efficiency; in addition, there is also a method of passively increasing its heat-resistant temperature by adding a large amount of talcum powder and other fillers. Or dimensional stability, direct injection molding through conventional molds, without the method of in-mold crystallization, this type of product can only reach a heat resistance of 70-80 ° C, which cannot meet higher use requirements

Method used

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  • Heat resistant polylactic acid composite material and preparation method thereof
  • Heat resistant polylactic acid composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Preparation of heat-resistant polylactic acid composites:

[0030] The polylactic acid particles are commercially available Natureworks products, the brand is 3001D, and the dew point is used to dry to a moisture content below 50ppm before use. 0.5%, the talcum powder adopts commercially available Guangxi Huamei superfine 5000 mesh talcum powder, and the addition amount is 40%, and the compatibilizer adopts commercially available EX-501 (ethylene-vinyl acetate copolymer, EVA), and the addition amount is 5% , using commercially available seaweed fiber, the addition amount is 4%. The pellets were melted and extruded in a twin-screw extruder. The temperature of each section of the extruder was shown in Table 1. The screw speed was 200 rpm, and the pellets were suspended and air-cooled. Therefore, they were packaged in aluminum foil bags and ready for use without additional drying.

[0031] Table 1 Temperature distribution of each section of the extruder

[0032] ...

Embodiment 2

[0041] Preparation of heat-resistant polylactic acid composites:

[0042] The polylactic acid particles are commercially available Natureworks products, the brand is 3001D, and the dew point is used to dry to a moisture content below 50ppm before use. Guangxi Huamei superfine 5000-mesh talc powder is sold, and the addition amount is 20%. The compatibilizer adopts commercially available EX-501 (ethylene-vinyl acetate copolymer, EVA), and the addition amount is 2%. The amount is 7%. Melt extrusion and granulation in a twin-screw extruder. The temperature of each section of the extruder is shown in Table 1, and the screw speed is 200rpm. Suspended air-cooled granulation is used, so it can be used after being packaged in an aluminum foil bag without additional drying.

[0043] The shrinkage rate of the mold is 0.3%. The above-mentioned particles are injected into disposable cutlery knives through the injection molding machine. The injection temperature is 170°C, and the injection...

Embodiment 3

[0050] Preparation of heat-resistant polylactic acid composites:

[0051] The polylactic acid particles are commercially available Natureworks products, the brand is 3001D, and the dew point is used to dry the moisture content below 50ppm before use. The nucleating agent is commercially available polylactic acid nucleating agent TMP-3000, and the addition amount is 2%. Guangxi Huamei superfine 5000-mesh talcum powder is sold, and the addition amount is 5%. The compatibilizer adopts commercially available EX-501 (ethylene-vinyl acetate copolymer, EVA), and the addition amount is 0.5%. The amount is 10%. Melt extrusion and granulation in a twin-screw extruder. The temperature of each section of the extruder is shown in Table 1, and the screw speed is 200rpm. Suspended air-cooled granulation is used, so it can be used after being packaged in an aluminum foil bag without additional drying.

[0052] The shrinkage rate of the mold was 0.3%, and the above-mentioned particles were in...

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Abstract

The invention belongs to the technical field of polymer materials and in particular relates to a heat resistant polylactic acid composite material and a preparation method thereof. The heat resistant polylactic acid composite material is prepared from the following raw materials by mass percent: 50-90% of polylactic acid particles, 0.5-2% of nucleating agents, 0.5-5% of compatilizer, 5-40% of filling material and 4-10% of alginate fibers. The heat resistant polylactic acid composite material has the advantages that by preferably selecting the polylactic acid nucleating agents, the crystallization process can be effectively completed in a drying oven and dimensional change in the baking process is small; the density of polylactic acid can be adjusted, the texture can be promoted and the cost can be reduced by adopting the filling material; meanwhile, the compatilizer is preferably selected, so that the mechanical properties of the highly filled heat resistant polylactic acid product are better; full crosslinking of reactive groups of all the components is promoted by adding the alginate fibers, thus further improving the mechanical properties and heat resistance of the material; crystallization outside molds is achieved through adjustment of a formula and the process; and the single injection molding cycle is shortened within 10 seconds.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a heat-resistant polylactic acid composite material and a preparation method thereof. Background technique [0002] Among biodegradable resins, polylactic acid resin is a polymer material obtained by chemical synthesis or biosynthesis with lactic acid as a monomer. Its raw materials are mainly corn, potatoes, etc., and the price is low. Carbon emissions are minimal. From the perspective of safety, polylactic acid is non-toxic and non-irritating, has excellent transparency and biodegradability, and is easily decomposed and metabolized by various microorganisms in nature or enzymes in animals and plants, and finally forms carbon dioxide and water, so as not to cause environmental pollution. It is an ideal green polymer material. [0003] Polylactic acid has good thermal stability, the processing temperature is 150-230°C, and it has good solvent resistance. I...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L23/08C08L5/04C08K5/20C08K3/34
Inventor 李程马学所
Owner SHENZHEN LYUYI PACKAGING CO LTD
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