Nanometer laminated boron nitride reinforced carbon fiber sizing agent, and preparation method thereof

A nano-sheet, boron nitride technology, applied in the direction of carbon fiber, fiber type, fiber treatment, etc., can solve the problems of damp heat aging, fiber/resin interface cracking, etc., to enhance the interaction force, increase the decomposition temperature, and reduce the aggregation phenomenon. Effect

Pending Publication Date: 2019-02-26
FUDAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a nanosheet boron nitride-reinforced carbon fiber sizing agent and its preparation method, which solves the problem of chemical degradation of the sizing agent in the prior art due to resin degradation and fiber / resin interface in a hot and humid environment. Humid heat aging problems caused by cracking, etc.

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  • Nanometer laminated boron nitride reinforced carbon fiber sizing agent, and preparation method thereof
  • Nanometer laminated boron nitride reinforced carbon fiber sizing agent, and preparation method thereof
  • Nanometer laminated boron nitride reinforced carbon fiber sizing agent, and preparation method thereof

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preparation example Construction

[0041] The present invention also provides a preparation method of a nanosheet boron nitride reinforced carbon fiber sizing agent, which is used to prepare the above nanosheet boron nitride reinforced carbon fiber sizing agent, comprising the following steps: organic resin, organic solvent, emulsified Mix and stir the solvent, dispersant and deionized water until phase transfer occurs to obtain an organic resin emulsion; mix the dispersion of compatible modified nanosheet boron nitride with the organic resin emulsion, add deionized water to dilute, and obtain nanosheets Layer boron nitride reinforced carbon fiber sizing.

[0042] Compared with the prior art, the preparation method of the nanosheet boron nitride reinforced carbon fiber sizing agent provided by the present invention is simple, reliable and low in cost, and the prepared compatible modified nanosheet boron nitride can play a role in carbon fiber To a very good protective effect, while improving the mechanical prop...

Embodiment 1

[0057] This embodiment provides a method for preparing a dispersion of compatible modified nanosheet boron nitride, comprising the following steps:

[0058] Step 1: Prepare an aqueous solution of isopropanol, wherein the volume percentage of isopropanol is 30%, boron nitride with an average crystallite size of 50 microns, the concentration of boron nitride is 10 mg / mL, and the dispersion liquid after mixing is 100 grams in total ;

[0059] Step 2: Ultrasonicize the dispersion obtained in Step 1, the ultrasonic power is 50W, and the ultrasonic time is 1 hour; after the ultrasonication is completed, let it stand for 4 hours; then centrifuge at 4000rpm to obtain the upper dispersion;

[0060] Step 3: Modify the dispersion liquid obtained in step 2: add acrylic acid and ammonium persulfate (the mass ratio of acrylic acid, ammonium persulfate, and boron nitride is 10:1:1) at 40°C, and react to obtain modified polyacrylic acid. Nano-sheet layer boron nitride dispersion liquid, poly...

Embodiment 2

[0063] This embodiment provides a method for preparing a dispersion of compatible modified nanosheet boron nitride, comprising the following steps:

[0064] Step 1: Prepare a mixed solution of water and isopropanol, wherein the volume ratio of isopropanol is 30%, then add boron nitride with an average crystallite size of 50 microns, the concentration of boron nitride is 1mg / mL, mix and disperse 100 grams in total;

[0065] Step 2: Ultrasonicize the dispersion obtained in Step 1, the ultrasonic power is 50W, and the ultrasonic time is 1 hour; after the ultrasonication is completed, let stand for 3 hours; then centrifuge at 1500rpm to obtain the upper dispersion;

[0066] Step 3: Modify the dispersion liquid obtained in step 2: add acrylic acid and ammonium persulfate at 30°C (the ratio is acrylic acid:ammonium persulfate:boron nitride=15:3:5), and react to obtain polyacrylic acid modified The dispersion liquid of nano-sheet boron nitride, after reacting for 5 hours, obtains th...

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Abstract

The invention discloses a nanometer laminated boron nitride reinforced carbon fiber sizing agent, and a preparation method thereof, and belongs to the technical field of composite material. The preparation method is capable of solving problems in the prior art that at humid hot environment, humidity hot aging is caused by resin chemical degradation and fiber/resin interface cracking. The nanometerlaminated boron nitride reinforced carbon fiber sizing agent comprises 100 parts of an organic resin, 0.3 to 6 parts of an emulsifier, 0.05 to 0.6 part of a dispersant, 0.05 to 1 part of a compatiblymodified nanometer laminated boron nitride dispersion liquid, 20 to 200 parts of an organic solvent, and 20 to 40 parts of deionized water; the compatibly modified nanometer laminated boron nitride dispersion liquid is a dispersion liquid of nanometer laminated boron nitride dispersion liquid processed through polyacrylic acid in-suit polymerization modification. According to the preparation method, raw materials are mixed and stirred until phase transferring is achieved; the compatibly modified nanometer laminated boron nitride dispersion liquid is mixed with the organic resin emulsion, deionized water is added for dilution so as to obtain the nanometer laminated boron nitride reinforced carbon fiber sizing agent. The nanometer laminated boron nitride reinforced carbon fiber sizing agentcan be used for carbon fiber sizing.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a compatible modified nanosheet boron nitride reinforced sizing agent and a preparation method thereof. Background technique [0002] Carbon fiber has a series of excellent properties such as high specific strength and high specific modulus, and is widely used in various fields. However, carbon fiber is brittle. The existence of silk is not conducive to the infiltration of resin on carbon fiber, which reduces its strength. The above problems can be solved by sizing. With the continuous improvement of performance requirements of carbon fiber composite materials, people pay more and more attention to the functional research of sizing agent. [0003] The moisture and heat resistance of composite materials is closely related to the moisture and heat resistance of carbon fiber sizing agents, but there are few reports on the influence of sizing agents on the moi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/55D06M11/80C08J5/06C08L63/00C08K13/06C08K9/04C08K9/02C08K7/06D06M101/40
CPCC08J5/06C08J2363/00C08K7/06C08K9/02C08K9/08C08K13/06D06M11/80D06M15/55D06M2101/40D06M2200/40
Inventor 杨旭叶明新沈剑锋李娜
Owner FUDAN UNIV
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