Bast fibers for plastics reinforcement and preparation method thereof

a technology of plastic reinforcement and base fibers, applied in the directions of yarn, filament/thread forming, transportation and packaging, etc., can solve the problems of poor performance of composite materials, negative effect of improving the interface bond strength, and difficult processing of plant fiber reinforced plastics

Inactive Publication Date: 2012-03-22
BILIC FORTUNE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]In step (1), the drying is of the type of vacuum drying at a temperature of 90˜150° C. and to the extent that the ...

Problems solved by technology

Most natural plant fibers are, in long fibrous form or after being formed into a fiber mat, compiled into hot press molding with thermosetting resin, while can not be added directly into thermoplastic plastics for injection molding as glass fibers; in addition, on the one hand, natural plant fibers show strong polar and hydrophilic qualities due to the high density of hydroxyl groups on fiber surface, which induces plant fibers to be poorly compatible with non-polar or weakly polar plastics and further leads to rather poor performance of composite materials thus made; on the other hand, plant fiber reinforced plastics are difficult for processing, in particular for injection molding, in light of the large volume and high filler content of plant fibers, as well as strong frictions existing between fibers and plastics, fibers and equipment, and among fibers.
For one thing, most of the coup...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0024](1) Cut 100 pts.wt. flax fibers to a length of 1˜20 mm to obtain chopped bast fibers; soak the chopped flax fibers in sodium hydroxide solution (mass concentration 10%) and agitate the mixture for 2 mins, after rinsing with water to pH=9.0 and centrifugal drying, soak them in the aqueous solution (mass concentration 20%) of bast fiber treating agent (90 pts.wt. trimethylol melamine resin) at a temperature of 90° C. for 30 mins until the solution is exhausted by the flax fibers, then dry them in vacuum at a temperature of 150° C. to the extent that the fibers have a water content of less than 1% and thus obtain surface-treated chopped flax fibers;

[0025](2) Add in order the surface-treated chopped flax fibers, 8 pts.wt. coupling agent (4 pts.wt. titanium coupling agent and 4 pts.wt. rare-earth coupling agent), 4 pts.wt. Functional Polyolefin wax (mixture of 2 pts.wt. metallocene polypropylene wax and 2 pts.wt. metallocene polyethylene wax) and 0.5 pts.wt. antioxidant (antioxidan...

example 3

[0026](1) Cut 100 pts.wt. agave fibers to a length of 1˜20mm to obtain chopped agave fibers; soak the chopped agave fibers in sodium hydroxide solution (mass concentration 5%) and agitate the mixture for 5 mins, after rinsing with water to pH=8.0 and centrifugal drying, soak them in the aqueous solution (mass concentration 10%) of bast fiber treating agent (100 pts.wt. hexamethylol melamine resin) at a temperature of 85° C. for 20 mins until the solution is exhausted by the agave fibers, then dry them in vacuum at a temperature of 120° C. to the extent that the fibers have a water content of less than 1% and thus obtain surface-treated chopped agave fibers; (2) Add in order the surface-treated chopped agave fibers, 7 pts.wt. coupling agent (5 pts.wt. aluminum coupling agent and 2 pts.wt. isocyanate coupling agent), 7 pts.wt. Functional Polyolefin wax (mixture of 5 pts.wt. metallocene polyethylene wax and 2 pts.wt. oxidized metallocene polyolefin wax) and 0.4 pts.wt. antioxidant (ant...

example 4

[0027](1) Cut 100 pts.wt. jute fibers to a length of 1˜20 mm to obtain chopped jute fibers; soak the chopped jute fibers in sodium hydroxide solution (mass concentration 3%) and agitate the mixture for 1 mins, after rinsing with water to pH=7.5 and centrifugal drying, soak them in the aqueous solution (mass concentration 30%) of bast fiber treating agent (50 pts.wt. urea-formaldehyde resin prepolymer) at a temperature of 88° C. for 25 mins until the solution is exhausted by the jute fibers, then dry them in vacuum at a temperature of 100° C. to the extent that the fibers have a water content of less than 1% and thus obtain surface-treated chopped jute fibers;

[0028](2) Add in order the surface-treated chopped jute fibers, 8 pts.wt. coupling agent (5 pts.wt. isocyanate coupling agent and 3 pts.wt, rare-earth coupling agent), 1 pts.wt. oxidized metallocene polyolefin wax and 0.3 pts.wt. antioxidant (antioxidant 1010 and antioxidant 168 with a mass ratio of 2:1) to a kneader preheated t...

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Abstract

The present invention refers to bast fibers for plastics reinforcement and preparation method thereof. The bast fibers are composed of the following components by weight ratio; 100 pts.wt. chopped bast fibers, 0.1˜100 pts.wt. bast fiber treating agent, 1˜10 pts.wt. Functional Polyolefin wax, 0.1˜10 pts.wt. coupling agent and 0.1˜0.5 pts.wt. antioxidant. The method includes the steps of: firstly, cut chopped bast fibers and soak them in sodium hydroxide solution, agitate the mixture, after rinse and drying of water, soak the fibers in the aqueous solution of bast fiber treating agent, then dry them and obtain surface-treated chopped bast fibers; secondly, add in order the chopped fibers, the coupling agent, the Functional Polyolefin wax and the antioxidant to a preheated kneader, agitate the mixture and thus obtain bast fibers for plastics reinforcement. Chopped bast fibers according to the invention present good color, rigidity and heat resistance, as well as excellent compatibility with plastics, and can be used in the preparation of high-performance short-bast-fiber\plastic composites, as reinforcement in the plastic matrix.

Description

FIELD OF THE INVENTION[0001]The invention refers to the natural fiber composite materials and wood-plastic composite materials, especially refers to bast fibers for plastics reinforcement and preparation method thereofBACKGROUND OF THE INVENTION[0002]In recent years, research in natural plant fiber composite materials and wood-plastic composite materials has been in the ascendant. This is on the one hand because of the wide range of sources of natural plant fibers and relatively lower prices, and on the other hand due to the trend of natural plant fiber reinforced plastics being used as a replacement of mineral fiber reinforced plastics.[0003]Most natural plant fibers are, in long fibrous form or after being formed into a fiber mat, compiled into hot press molding with thermosetting resin, while can not be added directly into thermoplastic plastics for injection molding as glass fibers; in addition, on the one hand, natural plant fibers show strong polar and hydrophilic qualities du...

Claims

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Application Information

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IPC IPC(8): D02G3/00D01D5/38
CPCB29B15/08C08L97/02Y10T428/2933C08L61/24C08L91/06C08L61/28D06M11/01D06M11/38D06M11/46D06M15/19
Inventor MA, TIEJUNLI, JIZHUGUO, XIUQINLIAO, YUTAODONG, PING
Owner BILIC FORTUNE TECH
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