Preparation method of volatile phenolic foam
The technology of phenolic foam and phenolic foam material is applied in the field of preparation of volatile phenolic foam, which can solve the problems of high acidity, high water absorption and high density, and achieve the effect of improving comprehensive performance and reducing acidity.
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example 1
[0022] First, weigh the reacted phenolic resin and sodium hydroxide in the reaction kettle according to the above ratio, stir them evenly for later use, heat up to 85-90°C after reacting for 1 hour, then react for 1.5 hours, and cool for 4 hours Weigh the surfactant and foaming agent in turn, add them to the container, start stirring, and stir for 2-5 minutes, then pour the weighed curing agent (combined sulfurous acid and benzenesulfonic acid) into the container, and stir for 10- 20 seconds, then pour the stirred liquid into the mold, put the mold into an oven at 60-80°C for foam molding, heat up to 130°C in the late stage of foaming, and take out the mold after the foam molding is completed , Remove the mold, and get low-acid phenolic foam.
[0023] The volatile inorganic acid used wherein has a concentration of 50%, a boiling point of 130°C, 7 parts of sulfurous acid and 5 parts of benzenesulfonic acid, and the azeotropic boiling point of the two is 128°C. In the later sta...
example 2
[0025] First, weigh the reacted phenolic resin and sodium hydroxide in the reaction kettle according to the above ratio, stir them evenly for later use, heat up to 85-90°C after the two react for 1 hour, then react for 1.5 hours, and then cool for 4 hours. Weigh the surfactant and foaming agent, add them into the container, start stirring, and stir for 2-5 minutes, then pour the weighed curing agent (combined with acetic acid and benzenesulfonic acid) into the container, and stir for 10-20 seconds , then pour the stirred liquid into the mold, put the mold into an oven at 60-80°C for foam molding, heat up to 130°C in the later stage of foaming, and take out the mold and disassemble it after the foam molding is completed mold, that is, low-acid phenolic foam is obtained.
[0026] Add 7 parts of acetic acid and 5 parts of benzenesulfonic acid, and heat up to an appropriate temperature of 130°C after the liquid is poured into the mold. Procedure for foaming in stages. The azeotr...
example 3
[0028] First, weigh the reacted phenolic resin and sodium hydroxide in the reaction kettle according to the above ratio, stir them evenly for later use, heat up to 85-90°C after the two react for 1 hour, then react for 1.5 hours, and then cool for 4 hours. Weigh the surfactant and foaming agent, add them into the container, start stirring, stir for 2-5 minutes, then pour the weighed curing agent (phosphoric acid and benzenesulfonic acid compound) into the container, and stir for 10-20 seconds , then pour the stirred liquid into the mold, put the mold into an oven at 60-80°C for foam molding, heat up to 130°C in the later stage of foaming, and take out the mold and disassemble it after the foam molding is completed mold, that is, low-acid phenolic foam is obtained.
[0029] Add 7 parts of phosphoric acid and 5 parts of benzenesulfonic acid, and heat up to an appropriate temperature of 130°C in the later stage of foaming, which is higher than the temperature of the previous stag...
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