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A PROCESS OF FABRICATING ADDITIVE-MODIFIED EPOXY RESIN CAST BODY WITH TARGETED LEVEL OF FLAME RETARDANT AND LOW SMOKE PROPERTIES FOR HIGH VOLTAGE INSULATION APPLICATION
A PROCESS OF FABRICATING ADDITIVE-MODIFIED EPOXY RESIN CAST BODY WITH TARGETED LEVEL OF FLAME RETARDANT AND LOW SMOKE PROPERTIES FOR HIGH VOLTAGE INSULATION APPLICATION
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机译：具有阻燃性和低烟性目标水平的增材改性环氧树脂铸体的制备方法在高压绝缘中的应用
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摘要
The invention relates to process of fabricating additive-modified epoxy resin cast body with targeted level of flame retardant and low smoke properties for high voltage insulation application comprising the steps of synthesizing nanostructured alumina additive material, having a tap density in the range of 0.2 - 0.3 g/cc by synthesis process with defined properties and characteristics of the material (Table 1); preparing an emulsion of additive material comprising nanostructured alumina along with other additive materials such as calcium carbonate, aluminium phosphate, zinc borate material� by mixing and treating the additive materials, with a functionalization agent for example liquid silane and a hardener for example, carboxylic acid based anhydride in a commercial Epoxy Resin system, wherein a 3D mixer is adapted, and wherein a predetermined weight ratio in each of the additive material including the silane and hardener is applied; preparing a mixed liquid� containing conventional Epoxy Resin for example bisphenol-a Epoxy Resin, flexibility for example polyglycol liquid, and accelerator for example tertiary amine liquid in a pre-defined ratio to obtain the mixed liquid� using a high shear mixer; mixing the emulsion of alumina, calcium carbonate, aluminium phosphate, zinc borate additive material: and the mixed liquid� together under a vacuum with pre-determined ratio of the two components to produce a filler- modified Epoxy Resin emulsion; casting thus-obtained additive-modified Epoxy Resin emulsion into moulds as per the dimension/shape of the components/specimens including removal of the air bubble in the composite body through de-gassing during casting; heat treatment of the cast body in an air circulated oven in a temperature range of 80-90oC preferably at 80oC for a period of 6-8 hours, and produce a pre-cured additive-modified resin body; and heat treatment of the pre-cured additive-modified resin body with air in an over at a temperature range of 140o - 150o C preferably at 140oC for a period of 6 - 8 hours, which produces a fully- cured additive-modified Epoxy Resin composite body.
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