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Method for preparing fully-degradable natural fibre/montmorillonite/polylactic acid composite material

A technology of natural fibers and composite materials, which is applied in the field of preparation of fully degradable natural fibers/montmorillonite/polylactic acid composite materials, can solve the problems of inability to carry out large-scale industrial production and cannot be completely degraded, and achieve excellent biodegradability, The preparation method is simple and effective, and the effect is suitable for industrial production

Active Publication Date: 2011-05-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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

[0030] 1. Polylactic acid, montmorillonite, and ramie fibers with an aspect ratio of 5 were vacuum-dried at 30°C for 24 hours to remove moisture.

[0031] 2. Mix the dried polylactic acid, montmorillonite, compatibilizer polycaprolactone and antioxidant tris(2,4-di-tert-butylphenyl) phosphite in a dry container in proportion by weight , wherein polylactic acid is 90 parts, montmorillonite is 8 parts, compatibilizer is 1 part, and antioxidant is 1 part; Melt and blend with twin-screw extruder, carry out reactive extrusion, screw speed is 10rpm, extrusion The outlet temperature is 140°C. After the material is extruded, it is cooled, pelletized and dried to obtain the masterbatch.

[0032] 3. Mix the polylactic acid masterbatch obtained in step 2 with polylactic acid and ramie fiber according to a certain ratio in a twin-screw extruder for compound extrusion, wherein the screw speed is 200rpm, and the extrusion temperature is 180°C. The polylactic acid masterbatch 5 parts for ra...

Embodiment 2

[0034] 1. Polylactic acid, montmorillonite, and sisal fibers with an aspect ratio of 100 were vacuum-dried at 120°C for 1 hour to remove moisture.

[0035] 2. Mix the dried polylactic acid, montmorillonite, compatibilizer polyhydroxyalkanoate and antioxidant phosphite tris (2,4-di-tert-butylphenyl) ester in a dry container in proportion by weight Uniform, wherein polylactic acid is 85 parts, montmorillonite is 6 parts, compatibilizer is 4 parts, antioxidant is 5 parts; Melt and blend with twin-screw extruder, carry out reactive extrusion, screw speed is 250rpm, The extrusion temperature is 190°C. After extrusion, the material is cooled, pelletized and dried to obtain the masterbatch.

[0036] 3. Mix the polylactic acid masterbatch obtained in step 2 with polylactic acid and sisal fiber according to a certain ratio in a twin-screw extruder for compound extrusion, wherein the screw speed is 250rpm, and the extrusion temperature is 180°C. The material is 25 parts, and the sisal ...

Embodiment 3

[0038] 1. Polylactic acid, montmorillonite, and jute fibers with an aspect ratio of 50 were vacuum-dried at 80°C for 12 hours to remove moisture.

[0039] 2. Mix the dried polylactic acid, montmorillonite, compatibilizer polyethylene glycol and antioxidant phenylene diisodecyl phosphite evenly in a dry container in proportion by weight, wherein polylactic acid is 80 parts, montmorillonite The soil is 15 parts, the compatibilizer is 4 parts, and the antioxidant is 1 part; use a twin-screw extruder to melt and blend, and carry out reactive extrusion, the screw speed is 150rpm, and the extrusion temperature is 180°C. The masterbatch is obtained after cooling, pelletizing and drying.

[0040]3. Mix the polylactic acid masterbatch obtained in step 2 with polylactic acid and jute fiber according to a certain ratio in a twin-screw extruder for compound extrusion, wherein the screw speed is 170rpm, the extrusion temperature is 170°C, and the polylactic acid masterbatch is 20 parts, j...

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Abstract

The present invention pertains to the art of macromolecular material technology, in particular to a preparation of fully-degradable natural fiber / imvite / polylactic acid composite material. The composite material consists of natural fiber, polylactic acid, imvite, antioxygen and compatilizer. The specific preparation steps include: masterbatch is obtained by fusing and mixing polylatic acid, organic modified imvite, antioxygen and compatilizer according to a certain proportion; then the masterbatch, polylactic acid and natural fiber are mixed and extruded according to a certain proportion; theextruded material is cooled, granulated and dried to obtain the polylactic acid / imvite / natural fiber composite material. Compared with the pure polylactic acid, the composite material with increaseddynamic performance, flame retardant performance and heat performance can be used to manufacture the engineering plastic with the rigorous conditions and requirements. The composite material providedby the present invention can be fully degradated in the natural environment after being abandoned, which pertains to environment-friendly material.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a fully degradable natural fiber / montmorillonite / polylactic acid composite material. Background technique [0002] Polylactic acid (PLA) is a linear aliphatic thermoplastic polyester. Typically, commercial grade PLA is a copolymer of poly(L-lactide) and poly(lactide). PLA is made from renewable resources. Compared with many plastic products based on the petroleum industry, PLA has superior properties and good biodegradability. PLA has high mechanical properties, thermoplasticity, fiber formation, and biodegradability. Therefore, it is recommended as a renewable and biodegradable plastic. Polylactic acid is an environmentally friendly material prepared from the fermentation product lactic acid of agricultural economic crops (corn, etc.) as the basic raw material. Physical and mechanical processing properties. Polylactic acid is sui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K5/524C08J5/10B29B9/12B29C47/40C08K3/34
Inventor 任杰于涛李树茂任天斌袁华
Owner TONGJI UNIV
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