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Pretreatment method of native cellulose fibers for reinforced composite

A reinforced composite material and natural cellulose technology, applied in the field of materials, can solve the problems of unfavorable reinforcement fiber matrix resin impregnation, poor dispersion of hemp fiber, poor compatibility between hemp fiber and resin matrix, etc., to achieve improved interfacial compatibility, high Effects of improving mechanical properties and degree of dispersion

Inactive Publication Date: 2012-08-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the melt viscosity of the resin (usually 500-5000Pa·S) generally exceeds 100Pa·S, it is not conducive to the distribution of reinforcing fibers and the impregnation of matrix resin during processing.
There are still two problems in the process of preparing hemp fiber reinforced composite materials: (1) the compatibility between hemp fiber and resin matrix is ​​poor; (2) the dispersion of hemp fiber in resin is poor
These two factors also essentially lead to the poor compatibility of natural fibers with the matrix and the low mechanical properties of composites.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A pretreatment method of ramie fiber for reinforced composite material is characterized in that it includes the following steps:

[0025] (1) Adjust the moisture content of ramie fiber to 60%, and keep it at 100°C for 3 hours;

[0026] (2) Keep the ramie fiber treated in step (1) at a temperature of 160°C and a pressure of 1.5 MPa for 3 minutes, quickly release the pressure, and open the defective part of the ramie fiber;

[0027] (3) The ramie fiber processed in step (2) is completely immersed in the swelling agent, and the swelling treatment is performed to open the tangles of the molecular segment of the ramie fiber amorphous region and fiber defect parts;

[0028] (4) After cleaning the ramie fiber processed in step (3), immerse it in water, and ultrasonically treat it for 50 minutes under the conditions of an ultrasonic frequency of 20KHz and a power of 500W to further open the molecular chain segment entanglement in the amorphous region of the ramie fiber;

[0029] (5) Dry ...

Embodiment 2

[0033] A pretreatment method of bamboo fiber for reinforced composite material, which is characterized in that it includes the following steps:

[0034] (1) Adjust the moisture content of bamboo fiber to 45%, and keep it at 100°C for 5 hours;

[0035] (2) Keep the bamboo fiber treated in step (1) at a temperature of 180°C and a pressure of 1.2 MPa for 2 minutes to quickly release the pressure and open the defective part of the bamboo fiber;

[0036] (3) The bamboo fiber processed in step (2) is completely immersed in the swelling agent, and the swelling treatment is performed to open the entanglement of the molecular chain in the amorphous area of ​​the bamboo fiber and the fiber defect site;

[0037] (4) After cleaning the bamboo fiber processed in step (3), immerse it in water, and ultrasonically treat it for 40 minutes under the conditions of an ultrasonic frequency of 30KHz and a power of 1000W to further open the entanglement of molecular chain segments in the amorphous area of ​​...

Embodiment 3

[0042] A pretreatment method of coconut shell fiber for reinforced composite material, which is characterized in that it includes the following steps:

[0043] (1) Adjust the moisture content of coconut husk fiber to 35%, and keep it at 100°C for 4 hours;

[0044] (2) Keep the coconut husk fiber treated in step (1) at a temperature of 170°C and a pressure of 1.5 MPa for 5 minutes, quickly release the pressure, and open the defective part of the coconut husk fiber;

[0045] (3) Completely immerse the coconut shell fiber processed in step (2) in the swelling agent, and perform a swelling treatment to open the entanglement of the molecular chain segments in the amorphous area of ​​the coconut shell fiber and fiber defect parts;

[0046] (4) After cleaning the coconut husk fiber processed in step (3), immerse it in water. Under the conditions of ultrasonic frequency of 40KHz and power of 2400W, ultrasonic treatment for 10 minutes to further open the molecular chain of the amorphous area of...

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Abstract

The invention discloses a pretreatment method of native cellulose fibers for a reinforced composite. Through the procedures of temperature and humidity balance, high-temperature high-pressure treatment, swelling treatment, ultrasonic treatment and the like on natural fibers, the pretreatment method can be used for opening entanglements of molecular chains of defect structures and amorphous regions of the natural fibers, eliminating weak and strong parts of the natural fibers while forming tiny hairiness structures on the surfaces of the natural fibers, improving the interfacial compatibility between the natural fibers and matrices of the composite and enhancing the dispersion degree of a natural fiber composite material, thereby providing conditions for preparing the natural fiber reinforced composite with high mechanical capacity.

Description

Technical field [0001] The invention belongs to the field of materials. It relates to a method for pretreatment of natural fibers for reinforced composite materials, in particular to a method for pretreatment of natural cellulose fibers for reinforced composite materials. Background technique [0002] Natural fibers are extremely rich in natural resources, which mainly include stem fibers (bamboo, wood, bagasse, sorghum stalks, straw, etc.), fruit fibers (coconut shells, peanut shells, etc.), bast fibers (flax, Jute, hemp, jute, etc.), leaf fibers (sisal, reed, thatch, etc.). Natural fiber composite materials are composed of natural fibers and a thermosetting or resin matrix. The fibers are dispersed in the matrix as a reinforcement and play the most important bearing role. Compared with glass fiber reinforced composite materials, natural fiber composite materials have the advantages of low density, good sound insulation, high specific performance, recyclability, low price, and...

Claims

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Application Information

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IPC IPC(8): C08J3/00C08L101/00C08L97/02
Inventor 万玉芹王鸿博高卫东
Owner JIANGNAN UNIV