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A kind of high toughness prepreg woven with bamboo strips and its preparation method

A prepreg and high-toughness technology, which is applied in the field of bamboo weaving high-toughness prepreg and its preparation, can solve the problems of poor permeability of bamboo strips, grooves on the surface of the board, and poor quality of the board, so as to achieve smooth surface and low resin content. Good control and wear resistance

Active Publication Date: 2020-11-13
ZHEJIANG FORESTRY ACAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor permeability of bamboo strips, commonly used urea-formaldehyde resin adhesives cannot penetrate into the interior of bamboo strips, and generally adhere to the surface of bamboo strips. When making bamboo plywood, defects such as glue leakage and surface grooves often occur, resulting in board Phenomenon of poor quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A preparation method for weaving high-toughness prepreg with bamboo strips, comprising the steps of:

[0061] S1, preparation of resin film:

[0062] Weigh liquid epoxy resin (E51), solid epoxy resin (E20), and novolac epoxy resin (F44) according to the ratio of mass ratio 4:3:3. After mixing, heat to 95°C to melt for 2 hours, and stir evenly at high speed. Cool to 70°C, add curing agent (dicyandiamide) and accelerator (dimethylurea imidazole) in sequence, stir at high speed until the mixture is uniform, apply it on release paper, and absorb it with a vacuum adsorption device at 0.1MPa, and cool it into a film, rolled up to obtain a resin film with a thickness of 0.5mm;

[0063] S2, the preparation of bamboo weaving sheet:

[0064] After the bamboo strips are cut according to the specifications of length 1500mm, width 20mm, and thickness 1mm, the bamboo strips are woven into a woven sheet with a length of 1500mm and a width of 200mm;

[0065] S3, bamboo strips prepre...

Embodiment 2

[0070] A preparation method for weaving high-toughness prepreg with bamboo strips, comprising the steps of:

[0071] S1, preparation of resin film

[0072] Weigh liquid epoxy resin (E51), solid epoxy resin (E20), and novolac epoxy resin (F44) at a mass ratio of 5:3:2. After mixing, heat to 110°C and melt for 1.5 hours. Stir, cool to 80°C, add curing agent (dicyandiamide) and accelerator (dimethylurea imidazole) in sequence, stir at high speed until the mixture is uniform, apply it on release paper, and treat it with 0.1MPa vacuum adsorption device. Cool to form a film, wind up, and get a resin film with a thickness of 1mm;

[0073] S2, the preparation of bamboo weaving sheet:

[0074] The bamboo is made according to the specifications of 2000mm in length, 30mm in width and 1.25mm in thickness.

[0075] After the thickness is determined and the bamboo strips are cut, the bamboo strips are woven in a vertical and horizontal weaving method, and a woven sheet with a length of 2...

Embodiment 3

[0081] A preparation method for weaving high-toughness prepreg with bamboo strips, comprising the steps of:

[0082] S1, preparation of resin film:

[0083] Weigh liquid epoxy resin (E51), solid epoxy resin (E20), and novolac epoxy resin (F44) according to the ratio of mass ratio 5:2:3. After mixing, heat to 100°C to melt for 2 hours, and stir evenly at high speed. Cool to 75°C, add curing agent (dicyandiamide) and accelerator (dimethylurea imidazole) in turn, stir at high speed until the mixture is uniform, apply it on release paper, and undergo 0.1MPa adsorption treatment with a vacuum adsorption device, and cool to form film, rolled up to obtain a resin film with a thickness of 0.5mm;

[0084] S2, the preparation of bamboo weaving sheet:

[0085] After cutting the bamboo according to the specifications of 1500mm in length, 20mm in width and 1mm in thickness, the bamboo strips are weaved vertically and vertically, vertically, vertically, vertically, vertically and vertical...

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Abstract

The invention discloses a bamboo strip woven high-toughness prepreg and a preparation method thereof. The prepreg is formed through compound impregnating of a bamboo strip woven material and hot meltresin, the bamboo strip woven sheet is woven from a plurality of bamboo strips in a vertically and horizontally crossed mode (vertical, horizontal, vertical, horizontal and vertical weaving), in a vertical reinforcement weaving mode (vertical, vertical, vertical, horizontal, vertical, vertical, vertical, horizontal, vertical, vertical and vertical weaving), in a horizontal reinforcement weaving mode (vertical, horizontal, horizontal, horizontal, vertical, horizontal, horizontal, horizontal and vertical weaving) or in a vertical strip reinforcement weaving mode; compound epoxy resin is obtainedby mixing liquid epoxy resin (E51), solid epoxy resin (E20) and phenolic epoxy resin (F44) in the weight ratio of 4:3:3, 5:3:2, 5:2:3 or 4:4:2. The bamboo strip woven sheet is used to prepare the prepreg with uniform performance and controllable content of resin, and the prepreg can not only play the feature of stable quality, but also shows the good tensile properties and good toughness of the bamboo strips, and excellent wear resistance of the bamboo strips as surface materials.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a high-toughness prepreg woven with bamboo strips and a preparation method thereof. Background technique [0002] Bamboo strips are one of the commonly used processing units for bamboo wood-based panels. They have the characteristics of good flexibility and high strength. They can be cross-woven into net-like sheets and are often used to make bamboo strip plywood. Due to the poor permeability of bamboo strips, commonly used urea-formaldehyde resin adhesives cannot penetrate into the interior of bamboo strips, and generally adhere to the surface of bamboo strips. When making bamboo plywood, defects such as glue leakage and surface grooves often occur, resulting in board Phenomenon of poor quality. [0003] Prepreg is an intermediate material for manufacturing high-performance composite materials, which has the advantages of smooth surface, stable resin content, and small thick...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L97/02C08J5/24
CPCC08J5/24C08J2363/00C08J2463/00C08J2497/02
Inventor 张文福王戈程海涛顾少华李明鹏
Owner ZHEJIANG FORESTRY ACAD
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