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Complete biodegradable polylactic acid composite material and method for preparing same

A composite material and biodegradable technology, which is applied in the field of fully biodegradable polylactic acid composite materials and their preparation, can solve the problems of lengthy melt blending and granulation production processes, industrial production, and performance degradation, and achieve mechanical properties. The effect of reducing raw material cost and improving performance

Inactive Publication Date: 2008-12-31
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process of melt blending and granulation is too long, and the composite material is easily degraded during the preparation and molding process, resulting in a decrease in its performance, and the method of in-situ polymerization cannot be used for large-scale industrial production, so it is necessary to find a production process Simple new method for preparing fully biodegradable polylactic acid composites

Method used

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  • Complete biodegradable polylactic acid composite material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Take 15g of ramie fiber with an aspect ratio of 15, soak it in 300g concentration of 0.01% silane coupling agent γ-aminopropyltriethylsiloxane (KH-550) aqueous solution for 1 minute, take it out, °C for 1 hour to obtain surface-treated ramie fibers.

[0030] 2. Put 8g of polylactic acid into a mold with a thickness of 0.3mm, and mold it in a flat vulcanizing machine. The molding temperature is 150°C, the time is 1 minute, and the pressure is 5Mpa to prepare a polylactic acid sheet with a thickness of 0.3mm.

[0031] 3. Put the 2 polylactic acid templates obtained in step 2 into a mold with a thickness of 0.6 mm, and spread 6 g of surface-modified ramie fibers in step 1 between the polylactic acid sheets. Then press molding in a flat vulcanizer, the molding temperature is 150° C., the time is 1 minute, and the pressure is 5 MPa to obtain the ramie fiber / polylactic acid composite material.

Embodiment 2

[0033] 1. Get 40g of sisal fiber with an aspect ratio of 50, soak it in a 400g concentration of 2% silane coupling agent γ-glycidyl ether propyltrimethoxysilane (KH-560) aqueous solution for 30 minutes, take it out, and Dry at 100° C. for 2 hours to obtain surface-treated sisal fibers.

[0034] 2. Put 15g of polylactic acid into a mold with a thickness of 2mm, and mold it in a flat vulcanizing machine. The molding temperature is 160°C, the time is 3 minutes, and the pressure is 10Mpa to obtain a polylactic acid sheet with a thickness of 2mm.

[0035] 3. Put the 3 polylactic acid templates obtained in step 2 into a mold with a thickness of 6 mm, and evenly spread 20 g of surface-modified sisal fibers in step 1 between the polylactic acid sheets. Then press molding in a flat vulcanizer, the molding temperature is 160° C., the time is 5 minutes, and the pressure is 10 MPa to obtain the sisal fiber / polylactic acid composite material.

Embodiment 3

[0037] 1. Take 40g of jute fiber with an aspect ratio of 100, soak it in a 300g aqueous solution of 3% silane coupling agent vinyltriethoxysilane (A-151) for 100 minutes, take it out, and dry it at 120°C for 48 Hour, obtain the jute fiber that is through surface treatment.

[0038] 2. Put 30g of polylactic acid into a mold with a thickness of 4mm, and mold it in a flat vulcanizing machine. The molding temperature is 180°C, the time is 5 minutes, and the pressure is 20Mpa to obtain a polylactic acid sheet with a thickness of 4mm.

[0039] 3. Put 3 polylactic acid templates obtained in step 2 into a mold with a thickness of 12mm, and evenly spread 40g of surface-modified jute fibers in step 1 between the polylactic acid sheets. Then mold compression molding in a flat vulcanizer, the molding temperature is 180 DEG C, the time is 15 minutes, and the pressure is 30Mpa to obtain the jute fiber / polylactic acid composite material.

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Abstract

The invention provides totally biologically degradable polylactic acid composite material and a preparation method thereof, belonging to the technical filed of macromolecule composite material. The composite material is composed of knitted or unknitted natural fiber which is modified at the surface, polylactic acid and silane coupling agent. The method includes the following steps: getting specific amount of knitted or unknitted natural fiber and dipping the natural fiber in the aqueous solution of silane coupling agent for 1-100min, taking out and drying the natural fiber, thus producing natural fiber with modified surface; then pressing the polylactic acid into sheet in a plate vulcanization machine; disposing 2-10 polylactic acid sheets into a die and arranging one modified natural fiber sheet between every two polylactic acid sheets; pressing and molding the sheets; in this way totally biologically degradable polylactic acid composite material can be made. Compared with pure polylactic acid, the polylactic acid composite material is improved in both mechanical property and thermal property. The composite material after use can be totally degraded in natural environment; therefore the composite material is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a fully biodegradable polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a synthetic linear aliphatic polyester, which is a synthetic polymer that is completely biodegradable in nature. Its synthetic monomer lactic acid is widely derived from agricultural products, and the degradation products are water and carbon dioxide which are harmless to the environment. Polylactic acid is used in industry, agriculture and daily life to solve the problem of "white pollution". However, polylactic acid itself is a linear polymer with high brittleness, low heat distortion temperature, poor impact resistance, low gas barrier and flame retardancy, and difficult to control the degradation cycle. These shortcomings limit the further application of polylactic acid. [0003] Natural fibers have the advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/02C08L97/02C08K5/5415B29C70/42B29K67/00B29K311/10B29L7/00B29L9/00
Inventor 尹静波王尹杰李孝秀鲁晓春曹斌颜世峰陈学思
Owner SHANGHAI UNIV
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