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
4 Cites 8 Cited by

AI-Extracted 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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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.

Application Domain

Technology Topic

Examples

  • Experimental program(6)

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 neutral (pH=7).
[0026] The grafting of hemp fiber and diisocyanate is adopted: the pre-treated hemp fiber is added to the acetone solution according to the bath ratio of 1:25~35, and then the diisocyanate is added. The dosage ratio of diisocyanate (ml) to hemp fiber (g) is 1~4:1~4, using strong inorganic acid as catalyst to make the reaction pH between 2~3, ultrasonic heating at 50~70℃, after reaction for 4~15h, wash away the diisocyanate adsorbed on the fiber with acetone and dry , The grafted hemp fiber is obtained, and the diisocyanate can be toluene-2.4-diisocyanate, toluene-2.6-diisocyanate, hexamethylene diisocyanate or lysine diisocyanate.
[0027] The existing textile technology is used for grafting and then weaving or weaving and then grafting to obtain continuous long fiber bundles or fabric structure reinforcement.
[0028] The continuous long fiber reinforced resin-based composite material is prepared by the conventional composite material molding process such as hot pressing, that is, natural hemp fiber reinforced resin-based composite material is prepared.

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 strength of 190MPa after testing.

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.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Strength185.0mPa
Strength195.0mPa
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

High efficiency corrosion inhibiting scale retardant

InactiveCN1715451AHigh corrosion inhibition performanceImprove dispersionScale removal and water softeningHigh concentrationPhosphate
Owner:SHANGHAI WANSEN WATER TREATMENT CO LTD

Classification and recommendation of technical efficacy words

  • Improve dispersion
  • Improve the enhancement effect

low-light-level image enhancement method and device based on Retinex

ActiveCN103295206AImprove the enhancement effectImprove image qualityImage enhancementImage enhancementImaging quality
Owner:TANGSHAN CAOFEIDIAN LIANCHENG TECH CO LTD

Method and apparatus for taking augmented reality photo, and mobile terminal

ActiveCN106101576ARich form of expressionImprove the enhancement effectTelevision system detailsColor television detailsImage captureAugmented reality
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD

Carbon fiber reinforced resin film and preparation method thereof

ActiveCN106243367AImprove the enhancement effectElectrophoretic depositionSurface modification
Owner:SHANGHAI JIAO TONG UNIV

Fibre-reinforced thermoplastic resin moulded article, and fibre-reinforced thermoplastic resin moulding material

ActiveCN108137829AImprove the enhancement effectGood impact strengthCoatingsChemistryFiber reinforcement
Owner:TORAY IND INC

Bio-based wood-plastic composite and preparation method thereof

InactiveCN109867929AImprove the enhancement effectImprove flexibilityAmmonium polyphosphateDichloromethane
Owner:嵊州市仲明新材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products