Nano modified polylactic acid and preparation method thereof

A nano-modified polylactic acid technology, which is applied in the field of polymer materials, can solve the problems of polylactic acid, such as flammability, poor comprehensive performance, and poor toughness, and achieve the effect of expanding the scope of application and improving impact resistance

Inactive Publication Date: 2010-11-10
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polylactic acid (also known as: lactic acid polymer; abbreviation: PLA) is a renewable and degradable polymer material prepared mainly from the fermentation product lactic acid of agricultural economic crops (corn, wheat, cassava, etc.) as the basic raw material. Ideal green and environment-friendly materials, widely used in clothing (underwear, outerwear), industry (construction, agriculture, forestry, paper) and medical and health fields, and its processing methods include extrusion, injection molding, film drawing, spinning, etc. , but polylactic acid is easy to burn and has poor toughness, resulting in a narrow application range, so it needs to be modified
The traditional modification methods of polylactic acid include blending with other polymers or adding inorganic fillers to the polymer matrix, but these methods can only improve the performance of a single aspect of the matrix polymer, and often take care of one and lose the other, and the overall performance is poor

Method used

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  • Nano modified polylactic acid and preparation method thereof
  • Nano modified polylactic acid and preparation method thereof
  • Nano modified polylactic acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] like figure 1 As shown, the nano-modified polylactic acid of this embodiment is mixed by polylactic acid, nanoparticles, heat stabilizer and processing aid, wherein the polylactic acid is 45wt%; the nanoparticles are calcium carbonate with an average particle size of 1 to 200nm and titanium dioxide mixture, wherein calcium carbonate is 40wt%, titanium dioxide is 5wt%; heat stabilizer is 2wt% triphenyl phosphite (TPP), 1wt% [3-(3,5-di-tert-butyl-4 -Hydroxyphenyl)propionic acid]pentapentylthritol ester (1010) and 2 wt% mixture of (2,4-di-tert-butylphenyl)phosphite (168); processing aids are lubricants and dispersants The mixture, wherein the dispersant is 3wt% white mineral oil, and the lubricant is 2wt% N, N'-ethylene bisstearamide (EBS).

[0022] Above-mentioned nano-modified polylactic acid adopts following preparation method:

[0023] A: Put the weighed polylactic acid, nanoparticles, heat stabilizer and processing aid in a high-speed mixer and mix for 300 seconds; ...

Embodiment 2

[0029] like figure 1 As shown, different from the above-mentioned Example 1, the nano-modified polylactic acid of this embodiment is mixed by polylactic acid, nanoparticles, thermal stabilizers and processing aids, wherein the polylactic acid is 94.6wt%; the nanoparticles are 5wt% calcium carbonate with an average particle diameter of 1 to 200nm; the thermal stabilizer is 0.2wt% [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentapentyl ester ( 1010); the processing aid is a lubricant, specifically 0.2 wt% of N,N'-ethylene bisstearic acid amide (EBS).

[0030] After testing, the performance of the above-mentioned nano-modified polylactic acid is as follows: figure 2 As shown, its tensile strength, flexural strength, flexural modulus, notched impact strength and flame retardancy are good, and it is suitable for auto parts, household appliances, precision electronic instruments and plastic processing industries.

[0031] The above-mentioned nano-modified polylactic aci...

Embodiment 3

[0033] like figure 1 As shown, different from the above-mentioned Examples 1 and 2, the nano-modified polylactic acid of this embodiment is mixed by polylactic acid, nanoparticles, thermal stabilizers and processing aids, wherein the polylactic acid is 75wt%; It is a mixture of calcium carbonate and titanium dioxide with an average particle size of 1 to 200nm, wherein calcium carbonate is 20wt%, and titanium dioxide is 2wt%; the thermal stabilizer is 1wt% triphenyl phosphite (TPP), 0.2wt% [3 -(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentapentylitol ester (1010) and 0.3wt% (2,4-di-tert-butylphenyl) phosphite (168 ) mixture; the processing aid is a mixture of a lubricant and a dispersant, wherein the dispersant is 1wt% white mineral oil, and the lubricant is 0.5wt% N, N'-ethylene bis stearic acid amide (EBS).

[0034] After testing, the performance of the above-mentioned nano-modified polylactic acid is as follows: figure 2 As shown, its tensile strength, flexural stre...

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Abstract

The invention aims to provide nano modified polylactic acid with high toughness and good flame resistance and a preparation method thereof. The nano modified polylactic acid is prepared by mixing the following raw materials in percentage by weight: 45 to 94.6 percent of polylactic acid, 5 to 45 percent of nano particles, 0.2 to 5 percent of thermal stability and 0.2 to 5 percent of processing aid. The preparation method comprises the following steps of: A, putting the weighed polylactic acid, nano particles, thermal stability and processing aid into a high-speed mixer in a ratio and mixing the raw materials; and B, conveying the raw materials mixed in the step A to a double-screw extruder, and melting, extruding and granulating the raw materials under high-speed shearing, mixing and conveying of screws to obtain a composite material. The polylactic acid is modified by using the nano particles, so the impact resistance, flame resistance, ageing resistance and bacterial pollution resistance of the polylactic acid composite material can be improved, and the application range of the polylactic acid composite material is enlarged.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a composite material of polylactic acid and a preparation method thereof. Background technique [0002] Polylactic acid (also known as: lactic acid polymer; abbreviation: PLA) is a renewable and degradable polymer material mainly prepared from the fermentation product lactic acid of agricultural economic crops (corn, wheat, cassava, etc.) as the basic raw material. Ideal green and environment-friendly materials, widely used in many fields such as clothing (underwear, outerwear), industry (construction, agriculture, forestry, papermaking) and medical and health, and its processing methods include extrusion, injection molding, film drawing, spinning, etc. , but polylactic acid is easy to burn and has poor toughness, resulting in a narrow application range, so it needs to be modified. The traditional modification methods of polylactic acid include blending wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K13/02C08K3/26C08K3/36C08K3/22C08K3/34B29C47/92B29C48/92
CPCB29C48/04B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 唐少俊
Owner CHERY AUTOMOBILE CO LTD
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