Normal-temperature curing type flame-retardant anti-cracking low-halogen epoxy pouring sealant for automotive ignition coil

Abstract

The invention relates to the field of high polymer chemistry, and particularly relates to a normal-temperature curing type flame-retardant anti-cracking low-halogen epoxy pouring sealant for an automotive ignition coil. The normal-temperature curing type flame-retardant anti-cracking low-halogen epoxy pouring sealant comprises a component A and a component B, wherein the component A comprises low-halogen bisphenol A epoxy resin, an activity polyurethane modified toughening agent, a diluent, aluminium hydroxide and alumina; and the component B comprises an alicyclic amine curing agent and a polyether amine curing agent. The invention also provides a preparation method and pouring technology of the normal-temperature curing type flame-retardant anti-cracking low-halogen epoxy pouring sealant for the automotive ignition coil. The normal-temperature curing type flame-retardant anti-cracking low-halogen epoxy pouring sealant for the automotive ignition coil, provided by the invention, resists high temperature of 160 DEG C and puncture voltage of 28-31kV, has halogen-free flame-retardant performance, does not crack after 100 times of cold and hot circulation at the temperate of minus 40 DEG C to 130 DEG C and can be cured at normal temperature.

Description

technical field [0001] The invention relates to the field of macromolecule chemistry, in particular to a normal-temperature-curable flame-retardant, crack-resistant, low-halogen epoxy potting adhesive for an automobile ignition coil. Background technique [0002] The automobile industry is developing very fast in our country. The automobile ignition coil is one of the essential components of the automobile, and the corresponding equipment has also increased significantly. Automobiles have been operating in various harsh environments for a long time and have withstood the test of changing climatic conditions. In order to ensure the safety and reliability of automobiles, the technical requirements for epoxy potting adhesives for automobile ignition coils are relatively stringent. According to experience, the epoxy potting adhesive should meet the following basic requirements: (1) The cured product has excellent electrical properties, and the electrical breakdown strength must ...

AI Technical Summary

Problems solved by technology

However, due to the hard and brittle characteristics of epoxy resin, there are disadvantages such as large internal stress, brittleness, fatigue resistance, heat resistance, impact resistance, crack resistance and poor heat and humidity resistance, so it is limited to a large extent. its application

[0004] In order to improve the hard, brittle and easy-to-crack characteristics of epoxy glue, epoxy glue is often modified. The commonly used modification method is to increase the toughness of liquid polysulfide rubber and nitrile rubber. Polysulfide rubber has a special odor, which often makes Operators feel uncomfortable, and nitrile rubber has poor compatibility with epoxy resin. It often requires a specific process to improve the compatibility of the two, which increases the construction process, and the best curing condition is heating up. energy consumption

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