A kind of preparation method of polysulfide rubber electrical insulation sealant

Abstract

The invention belongs to the technical field of high molecular sealant, and relates to a preparation method of an electrical-insulation polysulfide rubber sealant. The electrical-insulation polysulfide sealant is a two-component sealant; a component A is composed of liquid polysulfide rubber, a plasticizer, a filler, a catalyst, a silane coupling agent and the like; a component B is composed of epoxy resin, a plasticizer, a filler, a pigment and the like. The polysulfide sealant provided by the invention has good insulation performance and good comprehensive performance, and is suitable for application of insulation sealing of low-voltage cable joints, encapsulation of electronic devices and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer sealant, in particular to a preparation method of polysulfide rubber electrical insulation sealant. Background technique [0002] Polysulfide sealant has special oil resistance, solvent resistance, aging resistance, and excellent air tightness, water tightness, low temperature flexibility, and electrical insulation. These excellent properties of polysulfide sealant make it widely used in aviation, aerospace, construction , automobiles, ships, machinery, petrochemical and electrical instruments and other fields have been widely used. [0003] Most polysulfide sealants are two-component type. Component A is composed of liquid polysulfide rubber and additives. Component B is composed of active manganese dioxide and additives. The two components are mixed and cured into rubber elastomers. The product is only Can be dark colors such as black or gray. For example, Zhang Jixin disclosed the formula and...

AI Technical Summary

Problems solved by technology

Epoxy electrical insulation sealants have the disadvantages of high hardness, low elasticity, and large volume shrinkage after vulcanization. Although various toughening agents (including active hydroxyl-terminated nitrile rubber, carboxyl-terminated nitrile rubber, polysulfide rubber, polyurethane Modification, etc.) toughening, but compared with polysulfide, polyurethane, silicone sealant, there is still a big gap in its elasticity

Normal temperature curing epoxy sealant is usually a two-component type, while the one-component type sealant needs high temperature curing, which needs to be selected according to the application and construction conditions; the strength of silicone electrical insulation sealant is low, and the bonding performance and solvent resistance Poor performance; polyurethane electrical insulation sealant has poor storage stability, is greatly affected by ambient humidity and temperature during construction, easily retains air bubbles in vulcanized products, and has poor solvent resistance

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