Heat conduction type aramid nano insulation paper and preparation method thereof

A technology of insulating paper and aramid fiber, applied in the direction of organic insulators, plastic/resin/wax insulators, papermaking, etc., can solve the problem of low boron nitride retention rate affecting thermal conductivity, affecting strength and thermal conductivity, and losing the flexibility of aramid paper To solve problems such as mechanical properties and insulation properties, high strength, and excellent mechanical properties

Active Publication Date: 2018-12-11
宝鸡科达特种纸业有限责任公司
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Problems solved by technology

However, there are several problems in this method: (1) hexagonal boron nitride is directly added to the slurry formed by mixing aramid chopped/pulp fiber, and the retention rate of boron nitride is very low, which affects its thermal conductivity; (2) The surface of aramid chopped fiber is smooth and has few active groups. Add micron-sized boron nitride directly to the slurry. There is no effective combination between boron nitride and aramid fiber. It is only physical deposition, which affects its strength. and thermal conductivity; (3) This traditional aramid insulating paper prepared by using chopped and pulp fibers still needs high temperature and high pressure hot pressing to ensure its strength, complex process and large eq

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  • Heat conduction type aramid nano insulation paper and preparation method thereof

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preparation example Construction

[0029] A preparation method of heat-conducting aramid nano-insulation paper, comprising the following steps:

[0030] Step 1: Using one of para-aramid chopped fibers, para-aramid yarns, and para-aramid pulp fibers as a raw material, prepare aramid in a mixed solution system of potassium hydroxide and dimethyl sulfoxide Aramid nanofiber dispersion A; the aramid nanofiber dispersion A in the aramid nanofiber dispersion A has a diameter of 15-30 nm and a length of 3-10 μm; the aramid nanofiber dispersion A can be uniformly dispersed in water , the mass concentration of aramid nanofibers is 0.2-1.5%;

[0031] Step 2: adding nano-boron nitride with a particle size of 60-120 nm into a sodium hydroxide solution with a mass concentration of 20-60%, and performing modification treatment under the assistance of ultrasonic waves to obtain a hydroxylated nano-boron nitride dispersion B; The volume ratio of the nano boron nitride mass to the sodium hydroxide solution is 2-10mg / ml; the ult...

Embodiment 1

[0037] A heat-conducting aramid nano-insulating paper, the mass ratio of aramid nano-fibers to boron nitride in the heat-conducting aramid nano-insulating paper is 90:10; the aramid nano-fibers are para-aramid Yarn is used as a raw material, prepared in a mixed solution system of potassium hydroxide and dimethyl sulfoxide; the diameter of the aramid nanofiber is 15-30nm, and the length is 7-10μm; the aramid nanofiber is It has good dispersibility in the aqueous medium; the boron nitride crystal form is hexagonal whisker and has a flaky structure; the boron nitride is nano boron nitride with a particle size of 60-120nm; The nano-boron nitride is modified hydroxylated nano-boron nitride; the hydroxylated nano-boron nitride is made of boron nitride, and the sodium hydroxide solution with a mass concentration of 20% is assisted by ultrasonic waves. Prepared; the volume ratio of the nano boron nitride mass to the sodium hydroxide solution is 2mg / ml; the ultrasonic treatment process...

Embodiment 2

[0044] A heat-conducting aramid nano-insulating paper, the mass ratio of aramid nano-fibers to boron nitride in the heat-conducting aramid nano-insulating paper is 85:15; the aramid nano-fibers are para-aramid Chopped fibers are used as raw materials and prepared in a mixed solution system of potassium hydroxide and dimethyl sulfoxide; the diameter of the aramid nanofiber is 15-30 nm, and the length is 5-7 μm; the aramid nanofiber It has good dispersibility in the aqueous medium; the boron nitride crystal form is hexagonal whisker and has a thin sheet structure; the boron nitride is nano boron nitride, and its particle size is 60-120nm; The nano-boron nitride is modified hydroxylated nano-boron nitride; the hydroxylated nano-boron nitride is made of boron nitride, and the sodium hydroxide solution with a mass concentration of 30% is assisted by ultrasonic waves. The volume ratio of the nano boron nitride mass to the sodium hydroxide solution is 3mg / ml; the ultrasonic treatment...

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Abstract

The invention discloses heat conduction type aramid nano insulation paper and a preparation method thereof. According to the heat conduction type aramid nano insulation paper and the preparation method thereof, disclosed by the invention, aramid nano fiber with high strength, high modulus, high length-diameter ratio, good temperature resistance and good insulativity is utilized as a matrix, and good mechanical performance, good insulativity, good temperature resistance and good flexibility are given to aramid nano insulation paper; hydroxylated nano boron nitride is used as heat conduction filler and is dispersed in the aramid nano fiber matrix so as to be used for a main carrier for heat conduction, so that interface bonding is optimized, interface thermal resistance is reduced, high heatconductivity is given to the aramid nano insulation paper, and meanwhile, the insulavitity of the aramid nano insulation paper cannot be influenced; the problems that since the heat conductivity of aramid insulation paper at present is low, electrical insulation equipment is poor in heat dissipation and short in service life are solved; meanwhile, the problems that since a heat conduction composite resin impregnation technology is utilized, insulation paper is hard and crispy, the technology is complicated and the like are avoided.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials and papermaking, and in particular relates to a thermally conductive aramid fiber nano insulating paper and a preparation method thereof. Background technique [0002] In the field of electrical insulation products such as motors and transformers, insulating paper made of aramid fibers has obvious advantages in thermal stability, electrical properties and mechanical properties compared with natural fiber (such as cellulose-based insulating paper) products, and can be Significantly improve the service life and safety of electrical appliances. Aramid insulating paper has excellent mechanical properties, insulation properties, good high temperature resistance and chemical stability. Aramid insulating paper is widely used in the form of paper, cardboard, paper-film composite materials, aramid mica paper, etc. for coil windings of motors and transformers with insulation grades above H (maximum ope...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H15/02D21H17/69H01B3/52
CPCD21H13/26D21H15/02D21H17/69H01B3/52
Inventor 杨斌张美云陆赵情宋顺喜谭蕉君聂景怡罗晶晶张鸥
Owner 宝鸡科达特种纸业有限责任公司
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