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 fi

Method used

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Experimental program
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Example Embodiment

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

[0025] The degumming in the pre-treatment can be complete or incomplete degumming, both of which adopt the existing conventional textile hemp degumming process; the degreasing treatment is to soak natural hemp fiber in acetone for 10h-25h; alkali treatment is to make natural hemp fiber at a concentration of 5wt% Soak in ~25wt% NaOH aqueous solution for 10h-30h, and then wash with water to n...

Example Embodiment

[0029] Example 1

[0030] The completely degummed ramie fiber (refined dried hemp), soaked in 15wt% NaOH aqueous solution for 24h, washed with water until the pH is neutral (pH=7), dried under vacuum at 60°C for 4~5h, soaked in acetone solution for 24h for degreasing, then put it in In the reactor, add acetone solution with a bath ratio of 1:30, and then add toluene-2.4-diisocyanate. The ratio of toluene-2.4-diisocyanate (ml) to hemp fiber (g) is 2:1. Sulfuric acid, make the pH between 2 and 3; heating in an ultrasonic water bath, keeping the reaction temperature at 50℃, reaction time 10h, grafting rate 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 barrier; 125°C, 1.5MPa hot press molding, 105°C annealing for 2h to obtain ramie fiber reinforced PE composite material The board has a strengt...

Example Embodiment

[0031] Example 2

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

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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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