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Polylactic acid modified composite material and method for preparing same

A composite material and polylactic acid technology, applied in the field of polylactic acid modified composite material and its preparation

Active Publication Date: 2011-10-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned technical scheme improves the heat distortion temperature and bending strength of the original polylactic acid to a certain extent, but in the fields that require higher heat distortion temperature and bending strength, this kind of polylactic acid / montmorillonite nanocomposite material is somewhat insufficient

Method used

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  • Polylactic acid modified composite material and method for preparing same
  • Polylactic acid modified composite material and method for preparing same
  • Polylactic acid modified composite material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Using the first part of polylactic acid in the weight ratio in Table 1, nano-kaolin, compatibilizer (polycaprolactone) and chain extender (hydroquinone dihydroxyethyl) through dimethyl sulfoxide for intercalation treatment Ether) prepare the masterbatch according to the following method: dry polylactic acid in a vacuum oven at 40°C for 1 hour (to a moisture content of less than 100ppm), and dry the above-mentioned nano-kaolin in an oven at a temperature of 80°C for 1 hour (to a moisture content of less than 100ppm). content is less than 100ppm), and then the dried polylactic acid and nano-kaolin are uniformly mixed with a compatibilizer and a chain extender in a high mixer, and when the twin-screw extrusion temperature is 150-180°C, the mixed material is Extruded in a twin-screw extruder to obtain masterbatch A.

[0051] Take a certain weight of the above-mentioned masterbatch A, add the second part of polylactic acid, light stabilizer and antioxidant, wherein the antio...

Embodiment 2

[0053] Get the masterbatch A prepared in the embodiment 1 of certain weight, add the second part of polylactic acid, light stabilizer and antioxidant, wherein antioxidant is dibutyl hydroxytoluene, and light stabilizer is two (2,2,6, 6-tetramethylpiperidinyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and poly{[6-[(1,1 ,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-bis[(2,2,6,6,-tetramethyl-piperidinyl)imino ]-1,6-hexamethylene[(2,2,6,6-tetramethyl-4-piperidinyl)imino]} mixture, the added polylactic acid (excluding polylactic acid in the masterbatch) The weight of light stabilizer, antioxidant and masterbatch is as shown in Table 2. Mix the above mixture uniformly in a high mixer, control the temperature at 135-150°C, and then extrude through a twin-screw extruder to obtain nano-kaolin modified durable polylactic acid composites. The bending strength and heat distortion temperature of the composite material were measured, and the measurement results are sh...

Embodiment 3

[0055] Get the masterbatch A prepared in the embodiment 1 of certain weight, add the second part of polylactic acid, light stabilizer and antioxidant, wherein antioxidant is t-butyl hydroquinone, and light stabilizer is two (2,2, A mixture of 6,6-tetramethylpiperidinyl) sebacate and bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, the added polylactic acid ( The weight of the polylactic acid in the masterbatch is not included), light stabilizer, antioxidant and masterbatch are shown in Table 2, the above mixture is uniformly mixed in a high mixer, the temperature is controlled at 135-150°C, and then passed through a twin-screw extruder Extruded to prepare polylactic acid composite material modified by nano-kaolin. The bending strength and heat distortion temperature of the composite material were measured, and the measurement results are shown in Table 2.

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Abstract

The invention is applicable in all fields with high-temperature and environment protection requirements, and provides a polylactic acid modified composite material and a preparation method thereof; the components comprise polylactic acid and nano-Kaolin; the preparation method comprises the following steps: (1) the polylactic acid and the nano-Kaolin are dried under vacuum condition, and then evenly mixed with chain extendor and compatilizer; the mixed materials are extruded in an extruder, to obtain master batch; (2) antioxidant, light stabilizer and another portion of polylactic acid are added in the master batch to be evenly mixed, extruded by the extruder, to obtain the polylactic modified composite material. The composite material provided by the invention has high hot deformation temperature and bending strength.

Description

technical field [0001] The invention relates to a polylactic acid modified composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a new type of polyester material produced from organic acid lactic acid. It has good biodegradability. After polylactic acid is used, it can be completely degraded by microorganisms in nature, and finally produces carbon dioxide and water. It does not pollute the environment and protects the environment. Very favorable. At the same time, polylactic acid also has good thermoplasticity, which is suitable for various processing methods such as blow molding, extrusion, and injection molding, and is easy to process. However, the mechanical properties of polylactic acid, such as the bending strength can only reach 85.6MPa at most, usually cannot meet the needs, so the modification technology of polylactic acid has attracted widespread attention. The usual practice is to blend polylactic acid with ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/04B29B9/12C08K3/34C08K5/10C08K5/3435C08K5/13C08K5/524
Inventor 崔朝阳
Owner BYD CO LTD