Preparation method of para-aramid and graphene oxide/graphene composite paper

A graphene composite, para-aramid fiber technology, applied in 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 remove, difficult to clean Clean and other issues, to avoid adverse effects, low production costs, excellent thermal and electrical conductivity

Active Publication Date: 2019-07-26
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

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Effect test

preparation example Construction

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

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

[0033]Under nitrogen protection, in the solvent N-methylpyrrolidone (NMP) that has been dewatered, add solubilizing salt while stirring, and the amount of solubilizing salt is 5-10% of the solvent mass, 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 down to -5°C after the diamine monomer is completely dissolved ~5°C to obtain a second solution; add terephthaloyl chloride monomer to the second solution, carry out the polymerization reaction with high-speed stirring, and the stirring speed is 500-2000 rpm. Add dispersant, the amount of dispersant is 2 to 10 times the mass of the solvent, and stir at high speed wit...

Embodiment 1

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

[0052] Under nitrogen protection, 100 parts of solvent N-methylpyrrolidone (NMP), which has undergone dewatering treatment, was added to the reaction vessel, and 8 parts of co-solubilizing salt CaCl were added under stirring. 2 , and heated to 100°C to dissolve completely, and then cooled to 15°C in a cold water bath. 4.000 parts of p-phenylenediamine monomer was added to the reaction vessel, and after the diamine monomer was dissolved, the reaction vessel was cooled to 0°C. Then 7.571 parts of terephthaloyl chloride monomer was added, and the polymerization reaction was carried out with high-speed stirring. Stop stirring after the above-mentioned polymerization system reaction 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 was added to the above system with vigorous s...

Embodiment 2

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

[0064] Under nitrogen protection, 100 parts of solvent N-methylpyrrolidone (NMP), which has undergone dewatering treatment, was added to the reaction vessel, and 10 parts of co-solubilizing salt LiCl was added under stirring, and heated to 80 ° C to make it completely dissolved, Then the cold water bath was cooled to 10°C. 1.082 parts of p-phenylenediamine and 1.792 parts of 2,5-dichloro-p-phenylenediamine mixed monomer were added to the reaction vessel, and after the diamine monomer was dissolved, the reaction vessel was cooled to 0°C. Then 4.080 parts of terephthaloyl chloride monomer was added, and the polymerization reaction was carried out with high-speed stirring. Stop stirring after the above-mentioned polymerization system reaction appears gel phenomenon. Add 1000 parts of DMF to the polymerization system and stir at high speed to disperse it into a macroscopically uniform viscous solution. Then, ...

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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, and belongs 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 its 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, power, communications, national defense, and aerospace. Graphene (rGO) is currently the thinnest and strongest material known, with excellent properties such as high strength, low electrical resistivity, and high thermal ...

Claims

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Application Information

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Patent Type & Authority Applications(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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