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Surface modification method of plant fiber

A plant fiber and surface modification technology, applied in plant fiber, fiber treatment, textiles and papermaking, etc., can solve the problem of unrecognized compatibility and other problems, and achieve the effects of low production cost, high production efficiency and convenient operation.

Inactive Publication Date: 2014-05-21
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent modifies the surface of calcium sulfate by adding stearic acid to improve the compatibility of calcium sulfate, corn starch and ethylene-vinyl alcohol copolymer, while improving the fluidity of the melt and the surface smoothness of the composite material. It can be seen that the patentee did not recognize the compatibility effect of ethylene-vinyl alcohol copolymer on calcium sulfate and cornstarch, and the additives involved in patent ZL 201110189511.9, calcium sulfate and cornstarch and the plant fiber in this application are in the scientific classification belong to two completely different types of substances, that is, the patent has no enlightening effect on the present invention

Method used

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  • Surface modification method of plant fiber
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Experimental program
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Effect test

Embodiment 1

[0016] 1 g of ethylene-vinyl alcohol copolymer with an ethylene molar content of 70% was crushed into a 20-mesh powder, dried in a vacuum oven at 90 °C for 8 h, and then mixed with 5 g of glycerol evenly. 100 grams of wood powder was removed from impurities, crushed, sieved, dried in vacuum at 80°C for 2 hours, and then put into a high-mixer at 150°C, and the mixture of ethylene-vinyl alcohol copolymer and glycerin was added dropwise, and mixed with 3000 Mix at r / min for 10 min, take out the mixture to obtain modified wood powder.

[0017] The interfacial tension (mJ / m) of wood powder and polypropylene treated by this method 2 )as follows:

[0018]

[0019] The above results show that this method can effectively reduce the polarity of wood flour and improve the compatibility with polypropylene. Add 40 parts of wood flour modified by this method to 100 parts of polypropylene for the production of wood-plastic composite boards, and use a universal material testing machine ...

Embodiment 2

[0021] 6 g of ethylene-vinyl alcohol copolymer with an ethylene molar content of 30% was crushed into a 100-mesh powder, dried in a vacuum oven at 92 °C for 8 h, and then mixed with 30 g of glycerin. 100 grams of bamboo powder was removed from impurities, crushed, sieved, and then vacuum-dried for 2 hours at a temperature of 80°C, then put into a high-mixer at 190°C, and the mixture of ethylene-vinyl alcohol copolymer and glycerin was added dropwise, and mixed with 6000 r / min mixed for 5 min to obtain modified bamboo powder.

[0022] Add 40 parts of bamboo powder modified by this method into 100 parts of high-density polyethylene for the production of wood-plastic composite boards, use a universal material testing machine to test the mechanical properties of the gained composite material, the tensile strength is 38.26 MPa, the impact strength 14.02 kJ / m 2 , the bending strength is 47.84 MPa.

Embodiment 3

[0024] 3 g of ethylene-vinyl alcohol copolymer with an ethylene molar content of 44% was crushed into a 60-mesh powder, dried in a vacuum oven at 91 °C for 8 h, and then mixed with 15 g of glycerin. 100 grams of jute stalks were removed from impurities, crushed, sieved, vacuum-dried for 2 hours at a temperature of 80°C, and then put into a high-speed mixer at 175°C. Mix at r / min for 7 min to obtain modified jute stalks.

[0025] Add 40 parts of jute stalks modified by this method to 100 parts of polyvinyl chloride for the production of wood-plastic composite boards, and use a universal material testing machine to test the mechanical properties of the composite materials. The tensile strength is 34.36 MPa, and the impact strength is 15.02 kJ / m 2 , the bending strength is 43.65 MPa.

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Abstract

The invention discloses a surface modification method of a plant fiber. 100 parts of plant fiber, 1-6 parts of 20-100-mesh ethylene-vinyl alcohol copolymer and 5-30 parts of glycerol are activated for 5-10min at the temperature of 150-190 DEG C, so that the plant fiber modified from the ethylene-vinyl alcohol copolymer is prepared. The compatibility and dispersibility of a polymer matrix and the plant fiber in a wood-plastic composite material can be effectively improved. The modification method is simple and low in equipment requirement, is suitable for popularization and application, and has remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the field of material modification, and relates to a method for modifying the surface of plant fibers, in particular a method for modifying plant fibers with ethylene-vinyl alcohol copolymer to change the surface from hydrophilic to lipophilic. Background technique [0002] Wood-plastic composite material is a new type of material formed by compounding plant fiber as the main component with thermoplastics such as polyvinyl chloride, polyethylene, polypropylene, ethylene-vinyl acetate, etc. through certain molding and processing methods. The dual characteristics of natural fibers and plastics can make up for the deficiencies of the two, overcome the limitations of low strength and large variability of wood, and have the characteristics of low price, good mechanical properties, acid and alkali corrosion resistance, and recyclability. It can be used instead of wood in many occasions. Its development and promotion will effectively al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/21D06M13/148D06M101/04
Inventor 生瑜朱德钦陈星生政天童庆松
Owner FUJIAN NORMAL UNIV
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