Carbon fiber water-soluble epoxy resin sizing agent

A technology of epoxy resin and novolac epoxy resin, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of poor compatibility between emulsifier and resin, complicated preparation process, and effective component analysis, etc., to achieve Excellent static stability, simple preparation method, and the effect of reducing the amount of fuzz

Inactive Publication Date: 2015-03-18
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems in the storage and use of the emulsion type sizing agent: (1) The compatibility between the emulsifier and the resin is not good, and when the storage time is long, the demulsification phenomenon often occurs
(2) The sizing agent emulsion needs to be diluted to a system with a solid content of less than 5% during use, which may easily cause the separation of active ingredients; (3) The preparation process of some components of the sizing agent is complicated and the cost is high
Water-soluble carbon fiber sizing agents have excellent stability, but currently there are few patents for water-soluble sizing agents for carbon fibers

Method used

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  • Carbon fiber water-soluble epoxy resin sizing agent
  • Carbon fiber water-soluble epoxy resin sizing agent
  • Carbon fiber water-soluble epoxy resin sizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Synthesis of modified novolac epoxy resin: (1) Add the ethanol solution of novolak epoxy resin F-48 into a three-necked flask equipped with a condensation reflux device, stir at a constant speed of 50°C; The ethanol solution of diethanolamine was added dropwise, and the reaction was stirred at constant temperature for 2 hours to obtain the adduct EPN-DEA of novolac epoxy resin and diethanolamine. (2) Take glacial acetic acid in the amount of diethanolamine and other substances, dilute it to 60wt% with deionized water, and add it dropwise at 50°C to neutralize EPN-DEA to form a salt; The solvent is distilled off to obtain the modified novolac epoxy resin. In the above-mentioned reaction process, the mass ratio of epoxy novolac resin and ethanol is 30:70; The mass ratio of diethanolamine and ethanol is 50:50; The mol ratio of epoxy novolac resin and diethanolamine is 1:2.

[0031] Preparation of sizing agent: Mix the modified novolac epoxy resin and AEPH at a ratio of 70...

Embodiment 2

[0052] Synthesis of modified novolac epoxy resin: (1) Add the ethanol solution of novolac epoxy resin F-44 into a three-necked flask equipped with a condensation reflux device, stir at a constant speed of 40°C; The ethanol solution of diethanolamine was added dropwise in the mixture, and the reaction was stirred at constant temperature for 1 hour to obtain the adduct EPN-DEA of novolac epoxy resin and diethanolamine. (2) Take glacial acetic acid in the amount of diethanolamine and other substances, dilute it to 60wt% with deionized water, and add it dropwise at 40°C to neutralize EPN-DEA to form a salt; The solvent is distilled off to obtain the modified novolac epoxy resin. In the above-mentioned reaction process, the mass ratio of novolac epoxy resin and ethanol is 40:60; the mass ratio of diethanolamine and ethanol is 40:60; the molar ratio of novolak epoxy resin and diethanolamine is 3:2.

[0053] Preparation of sizing agent: Mix the modified novolac epoxy resin and AEPH ...

Embodiment 3

[0057] Synthesis of modified novolac epoxy resin: (1) Add the ethanol solution of novolak epoxy resin F-51 into a three-necked flask equipped with a condensation reflux device, and stir at a constant speed of 60°C; The ethanol solution of diethanolamine was added dropwise, and stirred at constant temperature for 3 hours to obtain the adduct EPN-DEA of novolac epoxy resin and diethanolamine. (2) Take glacial acetic acid in the amount of diethanolamine and other substances, dilute it to 60wt% with deionized water, and add it dropwise at 60°C to neutralize EPN-DEA to form a salt; The solvent is distilled off to obtain the modified novolac epoxy resin. In the above-mentioned reaction process, the mass ratio of epoxy novolac resin and ethanol is 50:50; The mass ratio of diethanolamine and ethanol is 60:40; The mol ratio of epoxy novolac resin and diethanolamine is 1:1.

[0058] Preparation of sizing agent: Mix the modified novolac epoxy resin and AEPH at a ratio of 90:10 at 50°C, ...

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Abstract

The invention discloses a carbon fiber water-soluble epoxy resin sizing agent and a preparation method thereof. The sizing agent comprises main slurry and deionized water as main components, wherein the mass ratio of the main slurry to the deionized water is (50-80):(20-50); and the main slurry consists of modified phenol-formaldehyde epoxy resin and allyl polyoxylethylene ether (AEPH), and the mass ratio of the modified phenol-formaldehyde epoxy resin to AEPH is (60-90):(10-40). The preparation method of the sizing agent comprises the following steps: firstly reacting phenol-formaldehyde epoxy resin with diethanolamine to obtain water-soluble phenol-formaldehyde epoxy resin; and then mixing the water-soluble resin with AEPH in proportion, and performing dilution to reach a certain concentration by using the deionized water to obtain the sizing agent. The sizing agent disclosed by the invention is good in stability and low in cost, cannot cause environmental pollution, and is simple in preparation method; good post-processing performance of carbon fibers can be provided by adding flexible molecular AEPH; experiments show that after the carbon fibers are coated with a proper amount of the sizing agent, the post-processing performance can be significantly improved; and the performance of a carbon fiber epoxy resin composite material can be improved.

Description

technical field [0001] The invention relates to a carbon fiber sizing agent and its preparation method and application, in particular to a carbon fiber water-soluble epoxy resin sizing agent and its preparation method and application. Background technique [0002] Carbon fiber has high strength, high modulus, high temperature resistance and other properties, and is widely used in various fields. However, carbon fibers have low elongation and are brittle, and they are subject to repeated bending and friction during processing, which can easily cause monofilament breakage and wool. When preparing fiber-reinforced composites, the hairs of carbon fibers will hinder the wetting of the matrix resin to the carbon fibers, resulting in poor mechanical properties of the obtained composites. To solve this problem, carbon fiber needs to be sized. Sizing is to coat a layer of protective glue on the surface of carbon fiber, which can not only improve the processing performance of carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55D06M15/53C08G59/14D06M101/40
Inventor 陈娟葛曷一李顺柳华实王冬至赵丹
Owner UNIV OF JINAN
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