Production method for oxazolidinone epoxy glass cloth laminated board

Abstract

The invention discloses a manufacturing method for an oxazolidone epoxy glass cloth laminated board, belonging to the technical field of the manufacturing methods of glass cloth laminated boards, which comprises the following steps: a, preparing oxazolidone epoxy resin: mixing low molecular weight bisphenol A epoxy resin with diisocyanate according to the mass ratio of 100 to 15 - 35, agitating and heating the mixture to 150 to 160 DEG C, then conducting cooling when the mixture takes on the color of wine red after reaction, and adding organic solvent to dilute the mixture for later use; b, preparing glass cloth presoaking glue liquefaction: in the oxazolidone epoxy resin glue solution prepared in step a, adding curing agent accounting for 15 to 25 % of the total resin solids, meanwhile adding accelerator 2-ethyl-4-methylimidazole according to 0.1 to 1% of the total resin solids, then adding thermal decomposition radical initiator according to the 3 to 15% of the mass of the curing agent, finally adjusting the viscosity of the glue solution by use of acetone to meet the demands of gum dipping process; c, dipping, baking, and pressing, so as to obtain the finished product of the oxazolidone epoxy glass cloth laminated board. The product produced according to the manufacturing method in the invention has the advantages of excellent heat resistance and electric insulation performance.

Description

technical field [0001] The invention relates to a method for manufacturing a heat-resistant laminated insulating material, in particular to the synthesis of oxazolidinone epoxy resin and the application of the formula composed of an oxazolidone epoxy resin and an acid anhydride curing agent in the manufacture of laminated boards. Background technique [0002] For a long time, 3240 epoxy phenolic glass cloth laminates have been used in F-class laminates in my country's electrical insulation materials, but the mechanical strength of 3240 boards is only 15% to 20% of normal at a thermal state of 155°C, which limits the use of large motors. , special motors, and the use of transformers in the industry, this contradiction has become particularly prominent in recent years. Although epoxy resin-based laminated insulating materials have good comprehensive mechanical and electrical properties, ordinary bisphenol A epoxy resin-based materials have limited heat resistance, and most of t...

AI Technical Summary

Problems solved by technology

However, the system of epoxy and maleic anhydride has the problem that performance and process cannot be balanced. If low molecular weight epoxy resin is used, the mixed system will be in a non-solid state, which cannot meet the gluing and pressing process. Even if the product can be obtained, its brittleness It is also larger; if a solid epoxy (or semi-solid) with a larger molecular weight is selected, the cross-linking density of the product will decrease significantly due to the long molecular chain, so the heat resistance will be poor.