Modified epoxy resin and preparation method thereof

Abstract

The invention belongs to the technical field of electric composite materials, and particularly relates to modified epoxy resin and a preparation method thereof. The preparation method comprises the following steps: mixing epoxy resin with a reactive diluent containing unsaturated double bonds and a reactive diluent containing flexible aliphatic chains according to a mass ratio of 100%: (3-5): (10-12) to prepare a component A; and mixing the component A with epoxy vinyl unsaturated resin accounting for 20-30% of the mass of the component A to complete the preparation of the modified epoxy resin. The prepared modified epoxy resin is balanced in mechanical property, insulating property and processing property, and is suitable for manufacturing components such as insulating cross arms, dry-type fiber sleeves and insulator struts in the power industry.

Description

technical field [0001] The invention belongs to the technical field of electric power composite materials, and specifically discloses a modified epoxy resin and a preparation method thereof. Background technique [0002] Power insulating cross arms, dry fiber bushings and insulator struts made of glass fiber reinforced resin composites have technical advantages such as light weight, high bearing capacity, corrosion resistance and insulation. Compared with traditional metal cross-arms, composite insulating cross-arms can be used in areas with high urbanization expansion, dense population and narrow power transmission corridors, which can give full play to the electrical insulation properties of composite cross-arms, effectively prevent lightning strikes and improve line safety; When used in mountainous areas with complex terrain, it can give full play to its light-weight and high-strength characteristics, greatly reduce the weight of towers, save a lot of labor costs, reduce ...

AI Technical Summary

Problems solved by technology

However, traditional E44, E51 and other epoxy resins generally have relatively high viscosity at room temperature, and it is difficult to fully infiltrate the glass fiber during processing, which affects the performance of the product; Body rods, dry-type bushings and insulator posts, generally use methyltetrahydrophthalic anhydride curing agent and 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30) as a catalyst for thermal curing , the initial curing temperature of the large-sized composite material products is usually relatively high, and once the curing starts, the self-opening ring-opening polyaddition reaction is relatively fast, and the heat release is severe, and it is easy to cause severe polymerization reactions inside the large-sized composite material mandrel. Internal heartburn cracking occurs due to excessive heat release, which seriously affects the internal insulation, mechanical strength and product stability of the product; again, the production of large-scale composite products requires a long processing time. Step heating is used for curing, so the curing time is very long, which seriously affects the processing efficiency of large-sized cross-arm mandrels, pillars, and sleeves, and the energy consumption is extremely high, and the long curing time is also not conducive to the uniformity of internal and external properties of the product. property, it is easy to delaminate the inner and outer interfaces of the step-by-step temperature rise and solidification, especially for the large-sized mandrel that is wound

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