Modified phenolic resin and preparation method thereof
A phenolic resin, modification technology, applied in the field of modified phenolic resin and its preparation, can solve the problems of low wear resistance, long hot pressing time, high curing temperature, etc., and achieve high curing temperature, simple process and mild conditions Effect
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[0034] In some embodiments of the present invention, a preparation method of modified phenolic resin is provided, comprising the steps of:
[0035] (A) phenol, cashew nut shell oil, lignin, liquid caustic soda and formaldehyde react to obtain component A after dehydration;
[0036] (B) phenol, formaldehyde and catalyst react, obtain component B after dehydration;
[0037] (C) Mixing component A, component B and urea to obtain a modified phenolic resin.
[0038] The preparation method of the modified phenolic resin provided by the invention uses phenol and formaldehyde as main raw materials, cashew nut shell oil and lignin as modifiers, and liquid alkali as catalyst to react to obtain component A; using phenol and formaldehyde as raw materials, in the catalyst Component B is obtained by reacting under the action, and after mixing, urea is added to reduce free formaldehyde to obtain the final product. The invention adds cashew nut shell oil and lignin to improve the heat resis...
Embodiment 1
[0061] The preparation method of the modified phenolic resin provided in this embodiment comprises the following steps:
[0062] (A) 500g of phenol, 100g of cashew nut shell oil and 100g of enzymolysis lignin were added to the reaction vessel, and then 15g of an aqueous solution of 32% NaOH by mass was added until the pH of the reaction solution was 8.1, and the temperature was raised to 75° C. Slowly added dropwise 800 g of an aqueous solution with a mass percentage of 37% formaldehyde was reacted at 75° C. for 2 hours, and dehydrated to obtain component A, and the content of water in component A was 2.5%.
[0063] (B) 500g of phenol, 580g of formaldehyde and 15g of zinc acetate were added to the reaction vessel, and the reaction was carried out under reflux at 99° C. for 2 hours. After dehydration, a component B was obtained, and the water content in the component B was 2.7%.
[0064] (C) Mixing Component A and Component B in a mass ratio of 10:6, and then adding urea to obt...
Embodiment 2
[0066] The preparation method of the modified phenolic resin provided in this embodiment comprises the following steps:
[0067] (A) 500g of phenol, 200g of cashew nut shell oil and 200g of enzymolysis lignin were added to the reaction vessel, then 15g of the aqueous solution of 32% NaOH by mass was added until the pH of the reaction solution was 8.0, the temperature was raised to 80° C., and slowly added dropwise 800 g of an aqueous solution of formaldehyde with a mass percentage of 37% was reacted at 80° C. for 2 hours, and dehydrated to obtain component A, and the content of water in component A was 3.1%.
[0068] (B) 500g of phenol, 580g of formaldehyde and 15g of zinc acetate were added to the reaction vessel, and the reaction was carried out under reflux at 99° C. for 2 hours. After dehydration, component B was obtained. The water content in component B was 2.6%.
[0069] (C) Mixing Component A and Component B in a mass ratio of 10:6, and then adding urea to obtain a mod...
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