Preparation method of cardanol-containing polyphenol modified amine epoxy resin curing agent
A technology of cardanol polyphenol modified amine epoxy resin and curing agent, which is applied in the direction of epoxy resin glue, adhesive, adhesive type, etc., and can solve the problems of poor heat resistance, limited application, and poor bonding performance at high temperature of the cured product. Good and other problems, to achieve the effect of good heat resistance, low price and excellent toughness
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[0014] Specific implementation mode 1: The preparation method of the cardanol-containing polyphenol-modified amine epoxy resin curing agent of this embodiment is implemented in the following steps:
[0015] 1. Add cardanol and phenols to the reaction device according to the molar ratio of 1:1~3, start stirring, heat to 40~50℃, (slowly) add the acid catalyst, and wait for the acid catalyst to dissolve after 10-30 minutes , The temperature is raised to 95-100°C, and the reaction is kept for 1 to 3 hours to obtain the intermediate product;
[0016] 2. Lower the temperature of the intermediate product obtained in step 1 to 20-50°C, add polyamines dropwise, keep the temperature unchanged at 20-50°C after dropping, and then (slowly) add aldehydes and raise the temperature to 90-100°C. Heat insulation reaction for 2 to 5 hours, after the reaction is completed, the temperature is lowered to 75 to 85°C, and dehydration is carried out under reduced pressure until anhydrous is removed to obta...
Example Embodiment
[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the phenols described in step 1 are a mixture of one or more of phenol, o-cresol, and resorcinol. Other steps and parameters are the same as in the first embodiment.
Example Embodiment
[0021] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the acidic catalyst described in step one is concentrated sulfuric acid, p-toluenesulfonic acid or Lewis acid. Other steps and parameters are the same as those in the first or second embodiment.
[0022] The mass concentration of concentrated sulfuric acid in this embodiment is 95% to 98%.
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