Polylactic acid and plant fiber composite material and preparation method thereof

A composite material and plant fiber technology, which is applied in the field of polylactic acid and plant fiber composite materials and their preparation, can solve the problems of complex operation, difficulty in industrialization, insufficient research on the heat resistance of polylactic acid composite materials, etc., and achieve simple operation , high production efficiency, and the effect of maintaining biodegradability

Inactive Publication Date: 2008-08-06
TORAY FIBER RES INST(CHINA) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patents have their unique features in improving the performance of polylactic acid composite materials, but they all have the disadvantages of complic

Method used

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  • Polylactic acid and plant fiber composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Accurately weigh 65 parts of polylactic acid (the weight-average molecular weight Mw is 100,000, and the content of D-lactic acid monomer unit is 2%), 2 parts of talcum powder and 3 parts of polyethylene glycol, and add from the main feed hopper after mixing In the extruder, 30 parts of ramie fiber yarn (the average length of the fiber is 20mm) is added from the side feed port, melt extrusion pelletization is carried out at 200 ° C, after drying, the sample is made according to the ASTM standard and its mechanical properties are measured and heat resistance (heat distortion temperature). Its properties are shown in Table 1.

Embodiment 2

[0037] Accurately weigh 68 parts of polylactic acid (Mw is 500,000, without dextrorotation), 2 parts of white carbon black, 0.5 part of polypropylene oxide and mix them evenly, then add them into the extruder from the main feed port, 29 parts of random flax Fibers (with an average fiber length of 100 μm) were added from the side feed port, melt-extruded and granulated at 210 ° C, dried and made into samples according to ASTM standards, and their mechanical properties and heat distortion temperature were measured. Its properties are shown in the table.

Embodiment 3

[0039] Accurately weigh 74 parts of polylactic acid (Mw is 250,000, dextrorotatory content is 10%), 1 part of kaolin, 5 parts of block copolymers of ethylene oxide and propylene oxide are mixed uniformly and then added to the In the extruder, 20 parts of bamboo fiber yarns (the average length of the fiber is 10mm) are added from the side feed port, melted and extruded to pelletize at 180°C, after drying, make samples according to the ASTM standard and measure its mechanical properties and Heat distortion temperature. Its properties are shown in Table 1.

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Abstract

The invention relates to composite material of polylactic acid and plant fiber, which is mainly formed by raw materials with the following parts of weight, 35-98.8 polylactic acide, 0-50 plant fiber, 0.1-5 nucleating agent and 0.1-10 nucleating-accelerant. The process of the invention has the advantages of simple operation and high production efficiency. And the composite material of polylactic acid and plant fiber which is prepared has high heat resistance, excellent mechanical property and favorable contour machining, and simultaneously keeps the biodegradability of the composite material.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polylactic acid and plant fiber composite material with high heat resistance and a preparation method thereof. Background technique [0002] Polylactic acid is a polymer material that can be polymerized from lactic acid fermented from crops (such as corn). Therefore, polylactic acid is an environmentally friendly polymer material. At the same time, because polylactic acid is also biodegradable, it has better mechanical properties and processing properties. However, the glass transition temperature of pure polylactic acid is low, only 50-65 ° C, and the crystallization speed of polylactic acid is slow, resulting in low heat resistance (heat distortion temperature) of polylactic acid molded products, which largely limits The scope of application of polylactic acid. By adding nucleating agents and nucleating aids, the crystallization of polylactic acid can be induced and acceler...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K5/521B29B9/12B29C47/38C08L97/02C08L71/00B29C48/395
Inventor 李大松朱可新郭晓何勇
Owner TORAY FIBER RES INST(CHINA) CO LTD
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