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Preparation method of grafted fibrilia modified and reinforced composite material

A technology for reinforcing composite materials and composite materials, applied in the field of hemp fiber modification and its reinforced composite materials, can solve the problems of insignificant fiber reinforcement effect of composite materials, and achieve the effects of improving the reinforcing effect, having environmental benefits, and improving dispersibility.

Inactive Publication Date: 2007-08-08
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of grafted hemp fiber modification and reinforced composite material thereof, adopt diisocyanate to graft with hemp fiber, combine weaving technology to make short hemp fiber bundle into continuous long fiber bundle, with continuous length The fiber bundle structure reinforced composite material solves the defect that the fiber reinforcement effect of the composite material prepared by the existing method is not significant

Method used

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Examples

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preparation example Construction

[0024] The preparation method of the hemp fiber-reinforced resin-based composite material of the invention is suitable for raw hemp, dry hemp, yarn or fabric of ramie fiber, flax fiber or sisal fiber. First, the hemp fiber is pre-treated, including degumming, degreasing and alkali treatment; then the treated fiber is grafted with diisocyanate; then the hemp fiber is woven into a fiber bundle or fabric by weaving technology, or the hemp fiber is woven into a fiber bundle or fabric, and then grafted with diisocyanate; finally compounded with resin to prepare a composite material.

[0025] Degumming can adopt complete degumming or incomplete degumming in the pretreatment, all adopt existing conventional textile hemp degumming process; Degreasing treatment is to soak natural hemp fiber with acetone for 10h~25h; Soak in ~25wt% NaOH aqueous solution for 10h~30h, and then wash with water until neutral (pH=7).

[0026] The grafting of hemp fiber and diisocyanate is to adopt: add the ...

Embodiment 1

[0030] The completely degummed ramie fiber (fine dry hemp) is soaked in 15wt% NaOH aqueous solution for 24 hours, washed with water until the pH is neutral (pH=7), dried in vacuum at 60°C for 4-5 hours, soaked in acetone solution for 24 hours for degreasing, and placed in In the reactor, add acetone solution, the bath ratio is 1: 30, then add toluene-2.4-diisocyanate, the consumption ratio of toluene-2.4-diisocyanate (ml) and hemp fiber (g) is 2: 1, add concentrated Sulfuric acid to keep the pH between 2 and 3; heating in an ultrasonic water bath to keep the reaction temperature at 50°C, the reaction time is 10 hours, the grafting rate is 45%, take out the ramie fiber, wash with acetone to remove unreacted toluene-2.4-diisocyanate, wash with water , dried at 80°C; woven into yarn or textile structure reinforcement, and unidirectionally laid with 0.06mm polyethylene (PE) film interlayer; 125°C, 1.5MPa hot pressing, annealed at 105°C for 2h, to obtain ramie fiber reinforced PE co...

Embodiment 2

[0032] Degummed and woven flax fiber bundles are soaked in 10wt% NaOH aqueous solution for 25 hours, washed with water until the pH is neutral (pH=7), dried in vacuum at 60°C for 4-5 hours, soaked in acetone solution for 25 hours for degreasing, and then placed in the reactor Add acetone solution, the bath ratio is 1:25, then add toluene-2.6-diisocyanate, the ratio of toluene-2.6-diisocyanate (ml) to hemp fiber (g) is 1:1, add concentrated sulfuric acid dropwise, Make the pH between 2 and 3, heat in an ultrasonic water bath, keep the reaction temperature at 65°C, the reaction time is 6 hours, the grafting rate is 39%, take out the flax fiber, wash with acetone to remove unreacted toluene-2.6-diisocyanate, wash with water, 80 Dry at ℃, lay unidirectionally with 0.06mm polyethylene (PE) film interlayer; hot press at 125℃, 1.5MPa; anneal at 105℃ for 2h, to obtain flax fiber reinforced PE composite board, and its strength is 185MPa after testing.

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Abstract

The invention discloses a manufacturing method for modification to graft apocynum fiber and the reinforced composite. At first, pre-treatment is carried out to apocynum fiber; then it is grafted with diisocyanate; and then after the grafted apocynum fiber is weaved into fiber beam or fabric, it is compounded with resin; finally reinforced resin matrix composite of apocynum fiber is produced. The method of invention makes short apocynum fiber beam form into continuous long fiber beam. The continuous long fiber beam reinforces resin matrix composite so as to improve the dispersion to structure and performance of short apocynum fiber, improve reinforced effect of apocynum fiber and obtain the composite. The intensity of composite can achieve 200MPa or so. The apocynum fiber takes the place of the glass fiber and enters into the high strength composite area. The application prospect is wide and it is provided with environmental benefit.

Description

technical field [0001] The invention belongs to the technical field of hemp fiber modification and its reinforced composite material, and relates to a method for preparing a hemp fiber reinforced resin-based composite material, in particular to a method for preparing a reinforced resin-based composite material after grafting hemp fiber and diisocyanate. Background technique [0002] At present, the technology of known hemp fiber-reinforced resin-based composite material has: 1. patent application number 02149613.7 " natural plant fiber reinforced fully degradable polymer composite material and preparation method thereof " (publication number CN1422899, publication date June 2003 11); 2. Patent Application No. 99116291.9 "Preparation Method of Natural Composite Material" (publication number CN1242396, published on January 26, 2000); 3. Patent Application No. 200510110181.4 "A Ramie Fiber Reinforced Polylactic Acid Composite Material "(publication number CN1760266, publication...

Claims

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Application Information

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IPC IPC(8): D06M13/395C08J5/06D06M101/04
Inventor 王俊勃杨敏鸽陈立成马亚明陈文青
Owner XI'AN POLYTECHNIC UNIVERSITY
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