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Full-degradation natural fibre/polylactic acid composite material and preparation method thereof

A technology of natural fibers and composite materials, applied in the field of fully degradable natural fiber/polylactic acid composite materials and their preparation, can solve the problems of inability to carry out large-scale industrial production and complete degradation, and achieve excellent biodegradability, mechanical properties and The effect of improving thermal performance and meeting environmental protection requirements

Inactive Publication Date: 2008-02-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In China, Sun Yat-sen University, National University of Defense Technology and other institutions have also carried out research on the compounding of natural plant fiber, unsaturated resin and polyurethane. Although some breakthroughs have been made in the mechanical properties and heat resistance of materials, the biggest disadvantage is It cannot be completely degraded
Donghua University applied for "A Preparation Method of Natural Fiber Reinforced Polylactic Acid Composite Material" in 2005. The patent mentioned that polylactic acid and polycaprolactone were used as the matrix, natural fibers were used as the reinforcing component, and in-situ polymerization was adopted. Preparation of composite materials, the disadvantage of this patent is that it cannot be used for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Take 100g of ramie fiber with an aspect ratio of 5, soak it in 200g of 0.01% silane coupling agent KH-550 (γ-aminopropyltriethoxysilane) aqueous solution for 1 minute, take it out, and put it at 50℃ Dry for 1 hour to obtain surface-treated ramie fibers.

[0027] 2. Plasticize 400g of polylactic acid in a two-roll mill at 100°C for 1 minute.

[0028] 3. Add the ramie fiber obtained in step 1 and carry out mixing. The mixing temperature is 100° C. and the mixing time is 1 minute. During mixing, the materials need to be cut to ensure that the materials are evenly mixed.

[0029] 4. Put the material obtained in step 3 into a mold, and mold it in a flat vulcanizing machine. The molding temperature is 150° C., the time is 1 minute, and the pressure is 5 MPa to obtain a ramie fiber / polylactic acid composite material.

Embodiment 2

[0031] 1, getting aspect ratio is 200g of jute fibers of 15, dipped in 400g concentration and is 1% in the aqueous solution of silane coupling agent KH-560 (γ-(2,3-glycidyloxy) propyltrimethoxysilane) 10 Minutes later, take it out, and dry it for 10 hours at 100° C. to obtain surface-treated jute fibers.

[0032] 2. Plasticize 200g of polylactic acid in a two-roll mill at 120°C for 5 minutes.

[0033] 3. Add the jute fiber obtained in step 1 and mix. The mixing temperature is 130° C. and the mixing time is 10 minutes. During mixing, the material needs to be cut to ensure that the material is evenly mixed.

[0034] 4. Put the material obtained in step 3 into a mold, and mold it in a flat vulcanizing machine. The molding temperature is 160° C., the time is 5 minutes, and the pressure is 8 MPa to obtain a jute fiber / polylactic acid composite material.

Embodiment 3

[0036] 1. Take 400g of sisal fiber with an aspect ratio of 40, and soak it in 300g of 5% silane coupling agent H-570 (γ-(methacryloyloxy)propyltrimethoxysilane) aqueous solution for 20 minutes Finally, take it out and dry it at 80°C for 5 hours to obtain surface-treated natural fibers.

[0037] 2. Plasticize 100 g of polylactic acid in a two-roll mill at 130° C. for 10 minutes.

[0038] 3. Add the sisal fiber obtained in step 1 and carry out mixing. The mixing temperature is 140° C. and the mixing time is 15 minutes. During mixing, the materials need to be cut to ensure that the materials are evenly mixed.

[0039] 4. Put the material obtained in step 3 into a mold, and mold it in a flat vulcanizing machine. The molding temperature is 170° C., the time is 10 minutes, and the pressure is 10 MPa to obtain a sisal fiber / polylactic acid composite material.

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Abstract

The present invention belongs to the technological field of the polymer material, provides and relates to a wholly degradable natural fiber and polylactic composite material and the preparation method. The composite material consists of the surface modified natural fiber and the polylactic acid. The specific preparation steps are: first the natural fiber of a certain long diameter is taken and the natural fiber is soaked in the aqueous solution of the coupling agent for 1 to 100 minutes; then the natural fiber is taken out and dried; thus the surface modified natural fiber can be got. Then the polylactic acid is molded and refined in the two-roller smelting machine at a temperature between 100 and 160 Celsius system; after 1 to 20 minutes, the surface modified natural fiber is added to mix and refine. The mixed products are putinto the mold; the mixed products are compressed and molded in the flat vulcanization machine to make the natural fiber and polylactic composite material. Compared with the pure polylactic acid, the mechanical and thermal performances of the composite material are improved; the composite material can be used in the preparation of the engineering plastics with the demanding conditions. The composite material of the present invention can be wholly degraded in the natural environment after being used and wasted, and the composite material belongs to the environmentally friendly material.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a fully degradable natural fiber / polylactic acid composite material and a preparation method thereof. Background technique [0002] At present, the application of biodegradable polymer materials in biomedicine and environment is becoming more and more important. Among them, polylactic acid (PLA) has become the most widely used biodegradable polymer material due to its degradability, good biocompatibility, good mechanical properties and molding processability. Polylactic acid plastics, fibers or films are used in industry, agriculture and daily life, which can solve the problem of "white pollution" and meet the requirements of environmental protection. However, PLA is hard, has poor toughness, lacks flexibility and elasticity, and is easily bent and deformed; the degree of crystallinity is high, and the degradation rate is not easy to control. It does not co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J5/04C08K5/54B29C70/06
Inventor 任杰于涛杨铭任天斌顾书英
Owner TONGJI UNIV
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