Methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA) is used as an epoxy resin curing agent, solvent-free paint, laminate, adhesive, etc. It has long-term coexistence at room temperature, low freezing point and low toxicity. It is widely used in the electronic and electrical industry, such as: dry transformers, insulators, insulating basins, insulating sleeves, insulating varnishes, high voltage switches, transformers, line output transformers, power and household capacitors, oil pipelines, etc. At present, domestic manufacturers of methyl tetrahydrophthalic anhydride (MTHPA, MeTHPA) are mainly concentrated in Shanghai, Jiaxing, Wuxi, Nantong, etc. The actual annual production capacity is about 50,000 tons.
In recent years, due to the rapid development of automatic molding technology for epoxy insulation products, new insulation materials using these products as raw materials have replaced traditional materials such as bakelite, SMC, porcelain, etc., and there is a great deal of epoxy insulation materials. Trends, market demand is growing.
With the rapid development of the electronic and electrical industry in China's four pillar industries and the transfer of such product manufacturing centers to China, the application of epoxy resin in China will be greatly increased, and the anhydride curing in this field will be applied. The agent will also grow at the same time. According to experts' estimates, by 2015, China's acid anhydride curing agent for the electrical and electronic industry can reach 200,000 tons, of which only 40,000 tons can be used for dry-type transformers. In particular, with the vigorous development of China's wind power industry, the demand for composite materials such as resins and coatings is increasing correspondingly for wind turbine components, which has found a new growth point for the market application of acid anhydride curing agents.