Method for treating aramid fiber doped modified cellulose insulation paper by plasma

Abstract

The invention relates to a method for treating aramid fiber doped modified cellulose insulation paper through plasma. The method comprises the following steps: firstly, soaking PMTA chopped fibers in a solution capable of removing attachments for a long time, and then taking out and washing the PMTA chopped fibers; putting the clean short fibers into a vacuum oven at 100 DEG C, drying for a plurality of hours, and putting into a low-temperature plasma reaction cavity; pumping the sealing cavity to low pressure, introducing NH3 gas, vacuumizing, and repeating the steps for multiple times; introducing NH3 into a vacuum sealing cavity, and keeping the constant atmospheric pressure in the cavity ; and under the constant atmospheric pressure, keeping stable high-frequency power supply voltage for continuous treatment for a period of time, and introducing nitrogen until the atmospheric pressure is the same as the external atmospheric pressure after the treatment is finished, so as to obtain the prepared PMTA chopped fiber. According to the aramid fiber modified by the low-temperature plasma, the binding force between the aramid fiber and a base material is improved, no pollution is caused during preparation, no catalyst is needed, more importantly, no damage is caused to the fiber, and the excellent performance of the PMTA can be kept.

Description

technical field [0001] The invention relates to the field of cellulose insulating paper, in particular to a method for plasma treating aramid fiber doped modified cellulose insulating paper. Background technique [0002] The existing composite insulation composed of insulating paper and insulating oil is the most widely used form of internal insulation for oil-immersed power equipment. Among them, natural cellulose insulating paper is widely used because of its good insulation and mechanical properties, environmental protection, renewability, and economy. In oil-paper insulation. Lignocellulose is made into insulating cardboard after papermaking processes such as beating and molding, and the dielectric constant (ε cellulose ≈4.1-4.8) is about the dielectric constant of mineral insulating oil (ε oil ≈2.2) twice or more. Under the alternating field strength, the insulating oil bears a higher field strength, and its breakdown field strength is much smaller than that of insul...

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Problems solved by technology

[0007]Aiming at the above-mentioned problems existing in the prior art, the technical problem to be solved by the present invention is: the high dielectric constant of cellulose insulating paper leads to electric field distribution when used in conjunction with insulating oil The problem of unevenness; the interface bonding ability between aramid fiber 1313 and natural cellulose is poor, which makes the mechanical properties of the composite insulating paper lower after mixing

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