A kind of modified phenolic resin
A phenolic resin, modified technology, used in the manufacture of tools, abrasives, metal processing equipment, etc., can solve the problems of decreased grinding wheel strength and cutting resistance, short grinding wheel storage period, and increased grinding wheel production costs.
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[0026] The invention provides a kind of preparation method of modified phenolic resin, comprises the following steps:
[0027] A) under the action of an acidic catalyst, heating the phenolic compound and the activator under constant pH conditions to undergo a first reaction to obtain a first reaction mixture;
[0028] B) performing a second reaction on the reaction mixture obtained in the above step A), the phenolic compound and the aldehyde compound to obtain a second reaction mixture;
[0029] C) After mixing the above second reaction mixture with a modifier, a modified phenolic resin is obtained;
[0030] The activator is lignin;
[0031] The modifier is rubber.
[0032] The modified phenolic resin provided by the present invention uses lignin as an activator, and in an acidic environment, the phenolic compound destroys structures such as ether bonds and ester bonds on the long molecular chain of the lignin, and then the phenolic compound is inserted into the On the acti...
Embodiment 1
[0056] First, put 100g of phenol and 1g of alkali lignin (Jinan Shengquan Group Co., Ltd.) into the reactor, stir evenly, then add catalyst phosphoric acid into the reactor, adjust the pH value to 2.5, and then heat up to 140°C for the first Reaction, after constant temperature reaction for 1 hour, the first reaction mixture was obtained.
[0057] Then, the temperature of the first reaction mixture was lowered to 70° C., 3 g of phenol was added for stirring, and the mixture was uniformly mixed. Then raise the temperature to 90°C and add formaldehyde dropwise, the molar ratio of formaldehyde to phenol is 0.7:1, and the temperature needs to be kept at 88°C during the dropwise addition. Then, the temperature was raised to 95° C. to continue the polycondensation reaction for 1 hour, and the second reaction mixture was obtained after the reaction was completed. The above second reaction mixture was heated to 120°C for distillation and dehydration under normal pressure, then cooled...
Embodiment 2
[0060] First, put 100g of phenol and 1g of alkali lignin (Jinan Shengquan Group Co., Ltd.) into the reactor, stir evenly, then add catalyst phosphoric acid into the reactor, adjust the pH value to 2.5, and then heat up to 140°C for the first Reaction, after constant temperature reaction for 1 hour, the first reaction mixture was obtained.
[0061] Then, the temperature of the first reaction mixture was lowered to 70° C., 3 g of phenol was added for stirring, and the mixture was uniformly mixed. Then raise the temperature to 90°C and add formaldehyde dropwise, the molar ratio of formaldehyde to phenol is 0.7:1, and the temperature needs to be kept at 88°C during the dropwise addition. Then, the temperature was raised to 95° C. to continue the polycondensation reaction for 1 hour, and the second reaction mixture was obtained after the reaction was completed. The second reaction mixture was heated to 120° C. for distillation and dehydration under normal pressure, then cooled to ...
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