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Preparation method of composite material with fiber surface coated with cellulose nano crystals and used for multi-scale enhancement

A technology for reinforcing composite materials and fiber surfaces, applied in the field of materials, can solve the problems of high cost, low preparation efficiency, poor macroscopic mechanical properties of fiber composite materials, etc., achieve low price, increase interlayer shear strength and interface bond strength , easy to disperse and environmentally friendly

Active Publication Date: 2015-12-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of poor macroscopic mechanical properties, low preparation efficiency, and high cost of fiber composite materials, and provides a fiber surface-coated cellulose nanocrystal that can significantly improve the macroscopic mechanical properties of fiber composite materials, with high efficiency and low cost. Preparation method for multi-scale reinforced composites

Method used

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  • Preparation method of composite material with fiber surface coated with cellulose nano crystals and used for multi-scale enhancement
  • Preparation method of composite material with fiber surface coated with cellulose nano crystals and used for multi-scale enhancement
  • Preparation method of composite material with fiber surface coated with cellulose nano crystals and used for multi-scale enhancement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 10nm cationic cellulose nanocrystals, deionized water, and sizing agent into the device at a mass ratio of 0.1:97:3 for mechanical stirring, stirring at a speed of 500r / min for 10min, and ultrasonication for 10min to obtain the dispersed particles. The above sizing solution: Wind the unsized T800 carbon fiber on the tractor, apply a certain tension, and carry out the sizing treatment. The soaking time is 30s, and the water is dried online at 250°C. The fibers coated with cellulose nanocrystals were prepared into unidirectional composite material splines, and cured according to the selection of epoxy resin amine curing agent system at 90°C / 1h+130°C / 3h+180°C / 2h , to obtain carbon fiber composites coated with cellulose nanocrystals on the fiber surface, and conduct interlaminar shear tests and micro-debonding tests. The test results show that the interlaminar shear strength is 2.4% higher than that of Comparative Example 1; the IFSS result obtained from the micro-debon...

Embodiment 2

[0021] Put 10nm cationic cellulose nanocrystals, deionized water, and sizing agent into the device at a mass ratio of 1:97:3 for mechanical stirring, stir at a speed of 500r / min for 10min, and ultrasonicate for 5min to obtain the dispersed particles. The above sizing solution: Wind the unsized T800 carbon fiber on the tractor, apply a certain tension to carry out the sizing treatment, the soaking time is 60s, and dry online at 200°C to remove water. The fibers coated with cellulose nanocrystals were prepared into unidirectional composite material splines, and cured according to the selection of epoxy resin amine curing agent system at 90°C / 1h+130°C / 3h+180°C / 2h , to obtain multi-scale reinforced composite materials coated with cellulose nanocrystals on the surface of fibers, and make specimens for interlaminar shear test and micro-debonding test. The test results show that the interlaminar shear strength is 6.3% higher than that of Comparative Example 1; the IFSS result obtaine...

Embodiment 3

[0023] Put 10nm cationic cellulose nanocrystals, deionized water, and sizing agent into the device with a mass ratio of 3:97:3 for mechanical stirring, stir at a speed of 500r / min for 10min, and ultrasonicate for 5min to obtain the dispersed particles. The above sizing solution: wind the unsized carbon fiber on the tractor, apply a certain tension to carry out the sizing treatment, the soaking time is 60s, and dry online at 200°C to remove water. The fibers coated with cellulose nanocrystals were prepared into unidirectional composite material splines, and cured according to the selection of epoxy resin amine curing agent system at 90°C / 1h+130°C / 3h+180°C / 2h , to obtain multi-scale reinforced composite materials coated with cellulose nanocrystals on the surface of fibers, and make specimens for interlaminar shear test and micro-debonding test. The test results show that the interlaminar shear strength is 0.2% higher than that of Comparative Example 1; the IFSS result obtained b...

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Abstract

The invention relates to a preparation method of a composite material with the fiber surface coated with cellulose nanocrystals and used for multi-scale enhancement. By adoption of the preparation method, the technical problems of poor macro-mechanical properties, low preparation efficiency and high cost of an existing fiber composite material are solved. The preparation method comprises the following steps: (1) putting the cellulose nanocrystals and deionized water in a device for mechanical stirring, carrying out ultrasonic dispersion and obtaining a sizing solution; (2) fixing unsized continuous fiber on a traction machine, and removing water by an impregnating vessel filled with the sizing solution and then winding for standby application; (3) preparing the obtained continuous fiber with the surface coated with the cellulose nanocrystals into a composite material strip sample, and curing according to the curing procedures of a selected resin system and obtaining the fiber-enhanced composite material coated with the cellulose nanocrystals. The preparation method can be widely used in the field of preparation of the composite material.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing fiber surfaces coated with cellulose nanocrystals for multi-scale reinforced composite materials. Background technique [0002] Fiber-reinforced resin matrix composites are composed of fibers, resin matrix and the interfacial phase between them, and the interface plays a crucial role in the performance of composite materials. The fiber surface is usually coated with a layer of sizing agent or coupling agent. If a certain chemical interaction can occur between the fiber surface-sizing agent or coupling agent-resin, the interfacial bonding between the fiber and the resin matrix can be greatly improved. Thereby improving the macroscopic mechanical properties of composite materials. [0003] ToshiyaKamae and others have coated carbon nanotubes on the surface of carbon fibers to prepare carbon fibers coated with carbon nanotubes. The surface treatment of the carbon na...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L97/02C08L77/00C08L23/06C08K7/06C08K7/14C08K9/04D06M15/05
Inventor 于运花李菁萱邓泉杨小平
Owner BEIJING UNIV OF CHEM TECH
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