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A kind of preparation method of para-aramid fiber and graphene oxide/graphene composite paper

A graphene composite and para-aramid fiber technology, applied in the direction of inorganic compound addition, synthetic cellulose/non-cellulose material pulp/paper, papermaking, etc., can solve the risk of reducing the thermal stability of PPTA, difficult to clean, difficult to Eliminate and other problems to achieve the effects of avoiding technical risks, excellent thermal and electrical conductivity, and low production costs

Active Publication Date: 2020-04-28
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of surfactants can effectively control the diameter of PPTA nanofibers, but it is difficult to clean up later, which reduces the risk of thermal stability of PPTA, especially polyvinyl alcohol monomethyl ether (mPEG) can also react with PPTA, which is even more difficult. remove it completely

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method of para-aramid fiber proposed by the inventive method and graphene oxide / graphene composite paper comprises the following steps:

[0032] (1) Preparation of para-aramid nanofiber aqueous dispersion:

[0033]Under the protection of nitrogen, in the solvent N-methylpyrrolidone (NMP) of water removal treatment, add the solubilizing salt while stirring, the addition of the solubilizing salt is 5~10% of the solvent quality, and heat to Dissolve the solubilizing salt at 80-100°C to obtain the first solution; cool the first solution to 5-15°C, add diamine monomer to the first solution, and cool to -5°C after the diamine monomer is completely dissolved ~5°C to obtain the second solution; add terephthaloyl dichloride monomer to the second solution, stir at a high speed for polymerization, the stirring speed is 500-2000rpm, stop stirring after gelation occurs in the polymerization system, and pour into the polymerization system Add a dispersant to the solu...

Embodiment 1

[0051] (1) Preparation of para-aramid nanofiber aqueous dispersion:

[0052] Under the protection of nitrogen, add 100 parts of solvent N-methylpyrrolidone (NMP) that has been treated with water removal into the reaction vessel, and add 8 parts of the solubilizing salt CaCl under stirring. 2 , and heated to 100°C to dissolve completely, then cooled to 15°C in a cold water bath. Add 4.000 parts of p-phenylenediamine monomer into the reaction container, and cool the reaction container to 0° C. after the diamine monomer is dissolved. Then add 7.571 parts of terephthaloyl chloride monomer, stir at high speed to carry out polymerization reaction. Stop stirring after the reaction of the above-mentioned polymerization system appears gel phenomenon. Add 500 parts of NMP to the polymerization system and stir at high speed to disperse it into a macroscopically uniform viscous solution. Then 2000 parts of water were added to the above system under vigorous stirring to obtain a homogen...

Embodiment 2

[0063] (1) Preparation of para-aramid nanofiber aqueous dispersion:

[0064] Under the protection of nitrogen, add 100 parts of the solvent N-methylpyrrolidone (NMP) that has undergone dehydration treatment into the reaction vessel, add 10 parts of the solubilizing salt LiCl under stirring, and heat to 80°C to completely dissolve it, Thereafter cooled to 10°C in a cold water bath. Add 1.082 parts of p-phenylenediamine and 1.792 parts of 2,5-dichloro-p-phenylenediamine mixed monomer into the reaction vessel, and cool the reaction vessel to 0°C after the diamine monomer is dissolved. Then add 4.080 parts of terephthaloyl dichloride monomer, stir at high speed to carry out polymerization reaction. Stop stirring after the reaction of the above-mentioned polymerization system appears gel phenomenon. Add 1000 parts of DMF to the polymerization system and stir it at high speed to disperse it into a macroscopically uniform viscous solution. Then, 5000 parts of ethanol was added to ...

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Abstract

The invention relates to a preparation method of para-aramid and graphene oxide / graphene composite paper and belongs to the technical field of high molecular materials. The preparation method includes: utilizing a polymerization one-step process without a surfactant added to prepare para-aramid nanofiber water dispersion liquid, utilizing the characteristic that para aramid nanofiber and grapheneoxide have high dispersity in water to well mix two dispersion liquids proportionally, and utilizing a conventional papermaking method to prepare the para-aramid / graphene oxide composite paper; utilizing a wet process or a dry process to reduce graphene oxide to obtain the para-aramid / graphene composite paper. Compared with the prior art, the preparation method has the advantages that the para-aramid and graphene / graphene oxide composite paper can be produced continuously on a large scale, the obtained composite paper has excellent performance, and the preparation method is friendly in corresponding production environment, low in cost and simple in process..

Description

technical field [0001] The invention relates to a preparation method of para-aramid fiber and graphene oxide / graphene composite paper, belonging to the technical field of polymer materials. Background technique [0002] As a representative of high-performance fibers, para-aramid has a series of excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, and low expansion coefficient. It is widely used in military, aerospace, electromechanical, construction and other fields. Due to the advantages of light weight, high temperature resistance, excellent mechanical properties and good insulation, para-aramid paper has been used as a structural material and high-performance insulating material in the fields of transportation, communication, national defense and aerospace. Graphene (rGO) is the thinnest and strongest material known so far, with excellent properties such as high strength, low resistivity, and high thermal conductivit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21H17/67D21H17/69D01F6/60D21F11/00D21F11/02C08G69/32
CPCC08G69/32D01F6/605D21F11/00D21F11/02D21H13/26D21H17/67D21H17/69
Inventor 庹新林张云奎刘振学侯晓峰郑亭路马韵升
Owner TSINGHUA UNIV
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