Process for producing wind electricity grade of bisphenol F epoxy resin

Abstract

The invention provides a comprehensive preparation technology for preparing bisphenol F with high para isomeride content first and then preparing wind-power bisphenol F epoxy resin with high epoxide number and low viscosity through the bisphenol F. The comprehensive preparation technology is as follows: formaldehyde and phenol are taken as raw materials, subjected to phenol formaldehyde condensation in a methanol solvent by adoption of a phosphoric acid as catalyst, and subjected to toluene recrystallization and freezing to obtain the bisphenol F with high para 4, 4'-isomer content; the bisphenol F and epichlorohydrin are taken as raw materials, added with dichlorohydrin, and subjected to ring-opening addition etherification reaction in the presence of catalyst hyamine benzyltrim-ethy-lammonium chloride, so as to generate a bisphenol F dichloro-alcohol ether intermediate; the bisphenol F dichloro-alcohol ether intermediate is added with solid alkali in batch, subjected to primary ring-closure epoxidation dechlorination reaction, and added with adequate diluted liquid alkali and adequate toluene solvent for secondary ring-closure epoxidation dechlorination reaction after separation of superfluous epichlorohydrin; and the bisphenol F dichloro-alcohol ether intermediate is subjected to crystallization of the toluene solvent, hot-water washing, vacuum drying and so on to obtain the bisphenol F epoxy resin product with high epoxide number and low viscosity.

Description

technical field [0001] The invention relates to a preparation method of wind power grade bisphenol F epoxy resin. The whole process is divided into four stages: (1) preparation of bisphenol F; (2) refining of bisphenol F; (2) preparation of bisphenol F resin; (3) Refined bisphenol F resin. technical background [0002] Wind power generation has the advantages of utilizing and transforming natural wind energy, not polluting the environment, and being flexible to use. It is an energy project encouraged and urgently needed by the state. Composite wind turbine blades are one of the key components of wind turbines. Megawatt-level blades need to consume a lot of raw materials such as epoxy resin, glass fiber, PVC, and coatings. The price of the blades accounts for about 25% of the generator set. Wind turbine blades work in the open air and have to withstand the test of natural weather and severe climate. Therefore, they have very high requirements in terms of weather resistance (...

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Problems solved by technology

Chinese patent CN96115169.2 has reported the method of using phosphoric acid as a catalyst to synthesize bisphenol F in two steps. Although phenol and formaldehyde are close to the equivalent ratio and the reaction temperature is normal temperature, the yield is only 60-80%. The content of isomers is low, and the purity of the product is not high

In addition, both this patent and the patent JP05202165 use liquid caustic soda (concentration of 30-50%) to catalyze the epoxidation dechlorination reaction in the closed-loop stage, so that azeotropic water separation should be used when adding alkali and within a period of time after adding alkali method to reduce the water content of the reaction system. During the implementation, the water taken out must be continuously taken out, and the epichlorohydrin will be evaporated and returned to the system, which is cumbersome and difficult to control in operation.

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