Preparation method of polyamide-modified epoxy carbon fiber

A technology of epoxy carbon fiber and polyamide, applied in the direction of carbon fiber, liquid-repellent fiber, fiber treatment, etc., can solve the problems of difficult control of processing time, complex conditions, decrease of carbon fiber modulus and breaking strength, etc., and achieve excellent clustering performance, excellent effect

Inactive Publication Date: 2017-05-10
BEIJING GUANGHUA TEXTILE GRP +1
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Problems solved by technology

[0006] The embodiment of the present invention provides a method for preparing polyamide-modified epoxy carbon fiber, which solves the problem that the method of carbon fiber modification in the prior art has complicated conditions, the processing time is not easy to control, and it is easy to cause the modulus and fracture strength of the carbon fiber to decrease. thereby significantly reducing the performance of its composites

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  • Preparation method of polyamide-modified epoxy carbon fiber

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[0025] Such as figure 1 as shown, figure 1 A schematic flow diagram of a method for preparing polyamide-modified epoxy carbon fiber is provided for the embodiment of the present application. The method for preparing a polyamide-modified epoxy carbon fiber provided in the embodiment of the present application includes:

[0026] Step 110: Put the polyamide resin and epoxy resin into a reaction kettle to obtain a polyamide-modified epoxy resin.

[0027] Specifically, determine that the molar weight of hydrogen repellent in the polyamide resin is a, and determine that the epoxy group molar weight of the epoxy resin is b; The amide resin and the epoxy resin are put into a reaction kettle to obtain the polyamide-modified epoxy resin.

[0028] Step 120: using a solvent to dissolve the polyamide-modified epoxy resin, and then adding a hydrophilic polyether and a catalyst to obtain a hydrophilic-modified polyamide-modified epoxy resin.

[0029] Specifically, the polyamide-modified e...

Embodiment 1

[0041] (1) Add 10g of polyamide resin 650 (the active hydrogen molarity is 0.051 moles) and 100g bisphenol A epoxy E51 (the epoxy group molarity is 0.51 moles) into a four-necked flask, and heat up under stirring to 120° C. and react for 2 hours to obtain a polyamide-modified epoxy resin.

[0042] (2) After the prepared polyamide modified epoxy resin solution is cooled to 40°C, add 40g of acetone, 0.24g of boron trifluoride ether solution and 66g of an average molecular weight of 2000 polyethylene glycol resin, after completely mixing, After stirring and reacting at 40° C. for 2 hours, acetone was distilled off to obtain a hydrophilic-modified polyamide-modified epoxy resin.

[0043] (3) The polyamide-modified epoxy resin of hydrophilic modification is warmed up to 60 ℃, after adding 30% deionized water of resin quality and stirring evenly, cool down to 40 ℃, then add 30% of resin quality in the mixing system again 1 times of deionized water post-stirring or high-shear emulsi...

Embodiment 2

[0046] (1) Add 10g polyamide resin 250 (wherein the active hydrogen molarity is 0.092 moles) and 110g bisphenol A type epoxy E51 (the epoxy group molarity is 0.56 moles) into a four-necked flask, and heat up under stirring After reacting for 3 hours at 100° C., a polyamide-modified epoxy resin was obtained.

[0047] (2) After cooling the prepared polyamide-modified epoxy resin solution to 20°C, add 100g of dichloromethane, 0.6g of boron trifluoride ether solution and 60g of polyethylene glycol resin with an average molecular weight of 4000, and keep it at 20°C After reacting with stirring for 4 hours, the methylene chloride was distilled off to obtain a hydrophilic-modified polyamide-modified epoxy resin.

[0048] (3) Heating the hydrophilic modified polyamide-modified epoxy resin to 40° C., adding deionized water twice the mass of the resin, stirring or high-shear emulsification to prepare a polyamide-modified epoxy emulsion.

[0049] (4) The polyamide-modified epoxy emulsio...

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Abstract

The application provides a preparation method of polyamide-modified epoxy carbon fiber, and relates to the field of preparation of carbon fiber / epoxy composite materials. The method comprises the steps of putting polyamide resin and epoxy resin into a reaction kettle to obtain polyamide-modified epoxy resin; dissolving the polyamide-modified epoxy resin by using a solvent, and then adding hydrophilic polyether and a catalyst to obtain hydrophilic modification polyamide-modified epoxy resin; adding deionized water into the hydrophilic modification polyamide-modified epoxy resin, shearing and stirring to obtain polyamide-modified epoxy emulsion; finally, carrying out sizing treatment on carbon fiber by taking the polyamide-modified epoxy emulsion as a sizing agent so as to obtain the polyamide-modified epoxy surface modification carbon fiber. The preparation method solves the problems that the modification method in the existing carbon fiber production is complicated in conditions and hard in control of treatment time, so that the modulus and breaking strength of the carbon fiber are easily reduced, and the performance of a carbon fiber composite material is greatly reduced accordingly.

Description

technical field [0001] The invention relates to the field of preparation of carbon fiber / epoxy composite materials, in particular to a preparation method of polyamide modified epoxy carbon fiber. Background technique [0002] Carbon fiber has the characteristics of high temperature resistance, high strength, high elastic modulus, and creep resistance. It is the most commonly used reinforcing fiber for preparing high-performance resin-based composite materials, so carbon fiber is often used to modify polyamide. However, the surface of carbon fiber is inert, and the interface bonding strength between the untreated composite material fiber and the resin is very weak, which affects the application of the material. [0003] Therefore, at present, before using carbon fiber to reinforce polyamide, the scientific and technological circles generally carry out surface treatment on carbon fiber to generate more active functional groups and form grooves. Adding it to the polymer materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/37C08G81/00D06M15/59D06M15/55D06M15/53D06M101/40
CPCD06M15/37C08G81/00D06M15/53D06M15/55D06M15/59D06M2101/40D06M2200/11
Inventor 江四九崔慧妍李新通马桂玲
Owner BEIJING GUANGHUA TEXTILE GRP
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