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Method for improving mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper

A hydrophobic and oleophobic technology with mechanical properties, applied in paper, papermaking, textiles and papermaking, etc., can solve the problems of accelerated aging of transformer insulating paper, reduced thermal stability of meta-aramid fibers, and reduced mechanical properties, and achieves excellent mechanical properties. Excellent performance, hydrophobic and oleophobic properties, and the effect of increasing the contact angle

Inactive Publication Date: 2018-02-06
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the action of moisture, the aging of transformer insulating paper will be accelerated, and the mechanical properties will decrease with the increase of moisture; and the thermal stability of meta-aramid fiber will also decrease with the increase of moisture

Method used

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  • Method for improving mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper
  • Method for improving mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper
  • Method for improving mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Aramid fiber paper making

[0037] 1. Add the dispersant polyethylene oxide (PEO) to the meta-aramid chopped fiber solution and the meta-sedimented fiber (pulp) respectively, and disperse and stir. The stirring speed is set to 1000 r / min, and the stirring time is 10 min at a temperature of 50 °C.

[0038] 2. Add the dispersant polyethylene oxide (PEO) to the para-aramid chopped fiber solution and the para-precipitated fiber (pulp) respectively, and disperse and stir. The stirring speed is set to 1000 r / min, and the stirring time is 10 min at a temperature of 50 °C.

[0039] 3. Preparation method of meta-aramid mixed solution (PMIA): mix according to the mass ratio of precipitated fiber solution (PMIA-2) and chopped fiber solution (PMIA-1) at 1:1.2, and disperse and stir. The dispersing stirring speed was 1000 r / min, the stirring time was 40 min, and the temperature was 50 °C.

[0040] 4. Preparation method of para-aramid mixed solution (PPTA): mix according to the...

Embodiment 2

[0053] 1. Aramid fiber paper making

[0054] 1. Add the dispersant polyethylene oxide (PEO) to the meta-aramid chopped fiber solution and the meta-sedimented fiber (pulp) respectively, and disperse and stir. The stirring speed is set to 1000 r / min, and the stirring time is 15 min at a temperature of 55 °C.

[0055] 2. Add the dispersant polyethylene oxide (PEO) to the para-aramid chopped fiber solution and the para-precipitated fiber (pulp) respectively, and disperse and stir. The stirring speed is set to 1000 r / min, and the stirring time is 15 min at a temperature of 55 °C.

[0056] 3. Preparation method of meta-aramid mixed solution (PMIA): mix the precipitated fiber solution (PMIA-2) and the chopped fiber solution (PMIA-1) with a mass ratio of 1:1.3, and disperse and stir. The stirring speed was 1000 r / min, the stirring time was 40 min, and the temperature was 55 °C.

[0057] 4. Preparation method of para-aramid mixed solution (PPTA): mix the precipitated fiber solution ...

Embodiment 3

[0070] 1. Aramid fiber paper making

[0071] 1. Add the dispersant polyethylene oxide (PEO) to the meta-aramid chopped fiber solution and the meta-sedimented fiber (pulp) respectively, and disperse and stir. The stirring speed is set to 1100 r / min, and the stirring time is 15 min at 60°C.

[0072] 2. Add the dispersant polyethylene oxide (PEO) to the para-aramid chopped fiber solution and the para-precipitated fiber (pulp) respectively, and disperse and stir. The stirring speed is set to 1100 r / min, and the stirring time is 15 min at 60°C.

[0073] 3. Preparation method of meta-aramid mixed solution (PMIA): mix the precipitated fiber solution (PMIA-2) and the chopped fiber solution (PMIA-1) with a mass ratio of 1:1.3, and disperse and stir. The stirring speed was 1100 r / min, the stirring time was 40 min, and the temperature was 60 °C.

[0074] 4. Preparation method of para-aramid mixed solution (PPTA): Mix the precipitated fiber solution (PPTA-2) and the chopped fiber solut...

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Abstract

The invention relates to a method for improving mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper. Para-position aramid fibers are added in a papermaking process of meta-position aramid insulating paper. Compared with meta-position aramid fibers, the para-position aramid fibers have better mechanical properties, so that the mechanical properties of the meta-position aramid insulating paper are further improved. The aramid insulating paper is modified by utilizing fluorine gas; after modification, a new group is introduced into the surface of the aramidinsulating paper so that the contact angle of the surface of the aramid insulating paper is enlarged and the hydrophobic and oleophobic properties of the aramid insulating paper are increased. A high-temperature soft calendering method is utilized so that the structure of the aramid insulating paper is not damaged and the crystallization degree of the aramid fibers can be greatly improved; meanwhile, the acting force between aramid cellulose chains is enhanced through a hot pressing manner, the combination is tighter and the linear density is increased; the tearing index and the tensile indexof the aramid insulating paper are greatly improved. The preparation method of the aramid insulating paper, provided by the invention, has the characteristics of simple technology, practicability andthe like.

Description

technical field [0001] The invention relates to a papermaking process of aramid insulating paper and a technology for hydrophobic and oleophobic of aramid insulating paper, in particular to a method for improving the mechanical properties and hydrophobic and oleophobic properties of aramid insulating paper. Background technique [0002] The power transformer is one of the key equipment for the grid power supply. The safe and reliable operation of the power transformer is the guarantee for the reliable operation of the grid. The oil-paper insulation system of the transformer is the basis for the safe operation of the transformer. [0003] During the long-term operation, the transformer oil-paper system will gradually age and produce moisture due to the influence of electric field, magnetic field, temperature, moisture and mechanical vibration and other factors. The aging of the insulating paper wound on the transformer winding is irreversible and cannot be replaced. A large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/10D21H21/08
CPCD21H13/10D21H21/08
Inventor 唐超殷飞王小波李娇胡东谢菊芳唐于京王亮郑伟田汶鑫
Owner SOUTHWEST UNIVERSITY
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