The preparation method of light color bisphenol A glycidyl ether type epoxy resin
A technology of glycidyl ether and epoxy resin, which is applied in the field of preparation of light-colored bisphenol A glycidyl ether epoxy resin, and can solve the problems such as deep color of bisphenol A glycidyl ether epoxy resin
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[0020] see figure 1 , the preparation method of the light-colored bisphenol A glycidyl ether type epoxy resin of one embodiment, comprises the following steps:
[0021] Step S110, in a protective gas atmosphere, mix bisphenol A and epichlorohydrin with a molar ratio of 0.5:2.5~20, stir to completely dissolve bisphenol A, add a phosphite antioxidant, and continue stirring Mix until uniform, add sodium hydroxide aqueous solution and react for 45 to 240 minutes at 50°C to 80°C to obtain a reaction solution.
[0022] Among them, bisphenol A, namely 2,2-bis(4-hydroxyphenyl)propane, is a compound containing more than one phenolic hydroxyl group and does not contain other groups reactive with epoxy groups.
[0023] The protective gas is nitrogen.
[0024] Preferably, the molar ratio of bisphenol A to epichlorohydrin is 0.5:2.5-12.
[0025] The structural formula of phosphite antioxidants is as follows:
[0026] ,
[0027] Among them, R 1 , R 2 , R 3 They are different or th...
Embodiment 1
[0052] In a nitrogen atmosphere, mix 114g of bisphenol A and 277.56g of epichlorohydrin, stir to completely dissolve bisphenol A, add 0.114g of diphenyl phosphite, continue to stir until the mixture is uniform, and add mass percent at 50°C 10.5 g of aqueous sodium hydroxide solution with a content of 50% was reacted for 150 minutes to obtain a reaction liquid.
[0053] At 50°C and a vacuum of 0.085 MPa, 60 g of 50% by mass sodium hydroxide aqueous solution was added dropwise to the reaction solution for 4 hours to remove water and excess epichlorohydrin to obtain a mixture.
[0054] The above mixture was dissolved in methyl isobutyl ketone, and a 10% by mass aqueous sodium hydroxide solution was added at 70° C. to react for 4 hours to obtain a reaction mixture. Dissolve the above reaction mixture in methyl isobutyl ketone again, wash with water, separate the liquids, take the organic layer and filter it with diatomaceous earth, remove the methyl isobutyl ketone to obtain a lig...
Embodiment 2
[0061] In a nitrogen atmosphere, mix 114 g of bisphenol A and 231.3 g of epichlorohydrin, stir to completely dissolve bisphenol A, add 0.0114 g of triphenyl phosphite, continue stirring until the mixture is uniform, and add mass 100 10.5 g of 50% sodium hydroxide aqueous solution was reacted for 45 minutes to obtain a reaction solution.
[0062] At 70°C and a vacuum of 0.090 MPa, 70 g of 40% by mass sodium hydroxide aqueous solution was added dropwise to the above reaction solution for 1.5 hours to remove water and excess epichlorohydrin to obtain a mixture.
[0063] The above mixture was dissolved in toluene, and 30% by mass aqueous sodium hydroxide solution was added at 90°C for 0.5 hour reaction to obtain a reaction mixture. The above-mentioned reaction mixture is dissolved in toluene again, washed with water, separated, and the organic layer is filtered with diatomaceous earth, and the light-colored bisphenol A glycidyl ether type epoxy resin is obtained after removing tol...
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