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Modified polylactic acid and preparation method thereof

A polylactic acid and modification technology, applied in the field of polylactic acid, can solve the problem that thermal stability, barrier property, solvent resistance, flame retardancy cannot meet the needs, it is difficult to improve the comprehensive performance of polylactic acid, and ordinary polylactic acid is difficult to meet, etc. The problem is to achieve the effect of simple and convenient preparation method, improved strength and improved processing performance.

Active Publication Date: 2013-06-12
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the mechanical properties and other properties of pure polylactic acid, such as thermal stability, barrier properties, solvent resistance, flame retardancy, etc., usually cannot meet the needs, which prompts people to conduct in-depth research on the modification of polylactic acid materials.
The traditional modification method is to mix polylactic acid with other high polymers or add inorganic fillers through simple mixing. There is no specific requirement for the processing technology. It can only improve some properties of polylactic acid, but it is difficult to improve the overall performance of polylactic acid. Therefore, ordinary polylactic acid is difficult to meet the application requirements of various industries, such as automobiles, home appliances, construction and other industries, which have higher requirements for plastic materials. In terms of mechanical properties of materials, they even have to reach or approach the level of engineering plastics. , and in the engineering process of polylactic acid materials, the most difficult problem to solve is to ensure that the material has high toughness, excellent appearance and excellent processing performance while also requiring high heat resistance

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  • Modified polylactic acid and preparation method thereof

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preparation example Construction

[0030] A kind of preparation method of polylactic acid of the present invention, comprises the steps:

[0031] 1), the polylactic acid particles are pulverized and passed through a sieve of more than 100 mesh to obtain polylactic acid powder;

[0032] 2) Mix polylactic acid powder, toughening agent, filler, light and heat stabilizer, and processing aid at 40-105°C for 5-25 minutes;

[0033] 3) Cool the above mixture to below 40°C and heat it to 140°C to 220°C in an extruder to obtain modified polylactic acid plastics after extrusion, cut into pellets after cooling, and seal and pack. In the above steps, the polylactic acid particles are first pulverized and then passed through a sieve of more than 100 meshes, so that the polylactic acid can be fully mixed with the toughening agent, filler, light and heat stabilizer, and processing aid; when mixing, the Put polylactic acid powder, toughening agent, filler, light and heat stabilizer, and processing aid in a high-speed mixer, mi...

Embodiment 1

[0035] 1), the polylactic acid particles are pulverized and passed through a sieve of more than 100 mesh to obtain polylactic acid powder;

[0036] 2) Put polylactic acid powder, toughening agent, filler, light and heat stabilizer, and processing aid in a high-speed mixer, and mix at a high speed of 1500 rpm for 12 minutes to reach 105 ° C, wherein the toughening agent It is ethylene-propylene-octene terpolymer (POE), the filler is talc powder, the light and heat stabilizer is titanium dioxide, the processing aid is stearic acid, and the weight percentage of each component is: polylactic acid 65% , toughening agent and filler are 15%, light and heat stabilizer and processing aid are 2.5%;

[0037] 3) Cool the above mixture at 500rpm to 35°C, then add it into a twin-screw extruder, the screw speed is 35rpm, the heating temperature of each part of the screw is 140-190°C, after extrusion, the modified polylactic acid plastic is obtained, and after cooling Cut into pellets, seale...

Embodiment 2

[0040] 1), the polylactic acid particles are pulverized and passed through a sieve of more than 100 mesh to obtain polylactic acid powder;

[0041] 2) Put polylactic acid powder, toughening agent, filler, light and heat stabilizer, and processing aid in a high-speed mixer, and mix at a high speed of 1000 rpm for 15 minutes to reach 75 ° C, wherein the toughening agent It is ethylene-propylene-butadiene terpolymer (EPDM), the filler is a mixture of talc powder and calcium carbonate, the light and heat stabilizer is titanium dioxide, the processing aid is metal soap, and the weight percentage of each component is : Polylactic acid 89.7%, toughening agent and filler both 5%, light and heat stabilizer 0.2%, processing aid 0.1%;

[0042] 3) Cool the above mixture at 200rpm to 35°C, and then add it to a twin-screw extruder, the screw speed is 25rpm, and the heating temperature of each part of the screw is 160-200°C. After extrusion, a modified polylactic acid plastic is obtained. Af...

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Abstract

The invention relates to the technical field of polylactic acids, in particular to a modified polylactic acid and a preparation method thereof. The modified polylactic acid comprises the following components in percentage by weight: 40-89.7 percent of polylactic acid, 5-40 percent of toughening agent, 5-40 percent of filler, 0.2-10 percent of photo-thermal stabilizing agent and 0.1-10 percent of processing aid, and the modified polylactic acid is prepared by pulverizing and mixing the components at a certain temperature and then extruding the components in extruding equipment, wherein the toughening agent can improve the anti-impact property of the polylactic acid; the filler can improve the heat resistance and the strength of the polylactic acid; the photo-thermal stabilizing agent can enhance the weathering resistance of the polylactic acid; and the processing aid can improve the processing property of the polylactic acid, thus the modified polylactic acid has higher heat resistanceand anti-impact property and widens the application range of polylactic acid materials in products having higher mechanical properties.

Description

technical field [0001] The invention relates to the technical field of polylactic acid, in particular to a modified polylactic acid and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a green material. The raw material comes from renewable crops. The most prominent advantage is biodegradability. After use, it can be completely degraded to generate carbon dioxide and water without polluting the environment. [0003] However, the mechanical properties and other properties of pure polylactic acid, such as thermal stability, barrier properties, solvent resistance, flame retardancy, etc., usually cannot meet the needs, which prompts people to conduct in-depth research on the modification of polylactic acid materials. The traditional modification method is to mix polylactic acid with other high polymers or add inorganic fillers through simple mixing. There is no specific requirement for the processing technology. It can only improve some proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L23/08C08L25/10C08L51/06C08K13/02C08K3/22
Inventor 唐少俊
Owner CHERY AUTOMOBILE CO LTD