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A heat-resistant water-based sizing agent for carbon fiber and its preparation method and application

A carbon fiber and sizing agent technology, which is applied in the field of carbon fiber manufacturing, can solve the problems of large specific gravity, sizing agent cannot be used in high temperature resistant thermoplastic resin-based composite materials, environmental pollution, etc., to improve interface performance, improve agglomeration phenomenon, and improve wettability Effect

Active Publication Date: 2020-09-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic solvent in the main slurry occupies a relatively large proportion (over 70%), so the use of this sizing agent will cause certain pollution to the environment
None of the above technologies can solve the problem that the commonly used sizing agents cannot be used for high temperature resistant thermoplastic resin-based composites.

Method used

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  • A heat-resistant water-based sizing agent for carbon fiber and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Preparation of reduced graphene oxide-magnetic particles

[0039] (1) 0.2g graphene oxide is dispersed in 100ml deionized water and ultrasonically treated for 0.5h;

[0040] (2) 0.81g FeCl 3 ·6H 2 O and 0.42g FeSO 4 •7H 2 O was dispersed in 100ml of deionized water, and then added to the solution of (1);

[0041] (3) Add dropwise 0.5mol / l sodium hydroxide solution to the suspension, adjust the pH value of the suspension to 9, adjust the reaction temperature to 75°C in the presence of a magnetic field, and stir for 2h;

[0042] (4) Add 1ml of hydrazine hydrate, and stir the new mixture at 90°C for 4h to ensure complete reduction of graphene oxide;

[0043](5) The obtained solid product was washed three times with ethanol, and dried in an oven at 60°C for 12h.

[0044] Step 2: Preparation of Polyamic Acid (PAA) Aqueous Dispersion

[0045] (1) Add 160ml N,N-dimethylformamide to a 250ml three-necked flask, mix 0.05mol 3,3',4,4'-benzophenone tetracarboxylic di...

Embodiment 2

[0053] A heat-resistant water-based sizing agent for carbon fibers and a preparation method thereof are the same as in Example 1, except that the organic solvent used in step 2 (4) is dimethylethanolamine.

[0054] After testing, put the carbon fiber tow in the sizing device, soak the carbon fiber in the sizing agent for 30s, and then dry it in a drying oven at 200°C for 10 minutes to obtain a carbon fiber with a sizing amount of 0.5%. The interlaminar shear strength of the carbon fiber reinforced polyethersulfone resin-based composite material sized by the water-based sizing agent is 32.8MPa, compared with the interlaminar shear strength 26.8MPa of the carbon fiber reinforced polyethersulfone composite material after epoxy sizing agent sizing, increase up 22.4%.

Embodiment 3

[0056] A heat-resistant water-based sizing agent for carbon fibers and a preparation method thereof, the same as in Example 1, the difference is that 0.237g of reduced graphene oxide-magnetic particle solids are added to the PAA aqueous dispersion, and diluted with deionized water to 158ml. The mass fraction of polyamic acid in the sizing agent is 1.5%, and the concentration of reduced graphene oxide-magnetic particles is 1.5mg / ml.

[0057] After testing, the carbon fiber tow was placed in the sizing device, the carbon fiber was immersed in the sizing agent for 30s, and then dried in a drying oven at 200°C for 10 minutes, so that the sizing amount of the carbon fiber was 1%. The interlaminar shear strength of the carbon fiber reinforced polyethersulfone resin-based composite material sized by the water-based sizing agent is 35.2MPa, compared with the interlaminar shear strength 26.8MPa of the carbon fiber reinforced polyethersulfone composite material after epoxy sizing agent ...

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Abstract

The invention relates to a heat-resisting water-based sizing agent for a carbon fiber, as well as a preparation method and application thereof. The preparation method comprises the steps of adding reduction-oxidation graphene-magnetic particles into a polyamide acid water-based dispersion body, and carrying out ultrasonic dispersion treatment to obtain the polyamide acid / reduction-oxidation graphene-magnetic particle water-based sizing agent. According to the heat-resisting water-based sizing agent for the carbon fiber provided by the invention, by utilizing the orientation effect of the magnetic particles under the magnetic field, graphene is driven to be arranged according to a certain direction, so that the agglomeration effect of the graphene is effectively weakened. The sizing agent prepared through the invention has excellent heat resistance, is environmental-friendly, and is suitable for high-temperature-resistance engineering plastics such as polyimide, polyether sulfone and polyether-ether-ketone.

Description

technical field [0001] The invention belongs to the field of carbon fiber manufacturing, and in particular relates to a heat-resistant water-based sizing agent for carbon fibers and a preparation method and application thereof. Background technique [0002] Carbon fiber has a series of excellent properties such as high temperature resistance, corrosion resistance, high specific strength, high specific modulus and small thermal expansion coefficient, and is often used as a reinforcement for composite materials. Carbon fiber is a brittle material, and it is easy to produce hairs during production and deep processing, which not only pollutes the working environment, but also affects the wettability of resin to fibers. The appearance of hairs causes pores and other defects at the interface of composite materials, which seriously affects the mechanical properties of composite materials. Moreover, the generation of wool filaments is often accompanied by the breakage of monofilame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/59D06M11/74D06M11/49C08J5/06C08L81/06C08K9/04C08K9/02C08K7/06D06M101/40
CPCC08J5/06C08J2381/06C08K7/06C08K9/02C08K9/04D06M11/49D06M11/74D06M15/59D06M2101/40
Inventor 张学军郝瑞婷田艳红
Owner BEIJING UNIV OF CHEM TECH
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