Phenol resin and epoxy resin and manufacturing method for same
A technology of epoxy resin and manufacturing method, which is applied in the field of phenolic resin and epoxy resin and its manufacturing, can solve the problem of degradation of characteristics when decomposed, and achieve the effect of suppressing environmental load and good characteristics
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[0102] The present embodiment will be specifically described below by showing examples and comparative examples, but the present invention is not limited by these examples. In addition, "part" and "%" mentioned below refer to a mass basis unless otherwise specified.
[0103] (Synthesis of PET Depolymerization)
[0104] First, a PET depolymerized product was synthesized as follows.
[0105] [PET depolymerization product synthesis example 1]
[0106] Add 192 parts of recycled PET flakes with an IV value of 0.6 to 0.7 into a 500ml four-neck detachable round bottom flask equipped with a stirrer, a nitrogen inlet tube, and a condenser tube to make the inside of the flask a nitrogen atmosphere. Heat up to 300°C in a salt bath. Stirring was started as the PET melted while 0.65 parts of dibutyltin oxide was added.
[0107] Next, 134 parts of trimethylolpropane (TMP) previously heated and melted at 130° C. was added little by little while being careful not to solidify PET. During ...
Synthetic example 2
[0110] Add 192 parts of recycled PET flakes with an IV value of 0.6 to 0.7 into a 500ml four-neck detachable round bottom flask equipped with a stirrer, a nitrogen inlet tube, and a condenser tube to make the inside of the flask a nitrogen atmosphere. Heat up to 300°C in a salt bath. Stirring was started after the PET had melted while adding 0.65 parts of dibutyltin oxide.
[0111] Next, 45 parts of trimethylolpropane (TMP) previously heated and melted at 130° C. was added little by little while being careful not to solidify PET. During this period, the stirring speed was increased to 150 rpm during the period of viscosity drop. Furthermore, after exchanging from a salt bath to an oil bath previously heated to 240° C., and keeping the inner temperature of the flask at 220° C. (±10° C.) for 5 hours, the mixture was cooled to room temperature.
[0112] The obtained depolymerized product is called depolymerized product B.
[0113] The PET depolymerized product thus obtained wa...
Synthetic example 1
[0115] Add 200 parts of depolymerization product A, 250 parts of 3-hydroxybenzoic acid, and 0.5 part of dibutyltin oxide into a 500ml four-necked round-bottom detachable flask equipped with a stirrer, nitrogen inlet tube, and condenser tube to make nitrogen gas in the flask atmosphere. While slowly heating the oil bath to 200°C, it took about 4 to 6 hours to remove the condensed water. When the acid value was sufficiently reduced, the oil bath was removed, and the contents of the flask were taken out to obtain a phenolic resin with a PET content of 26%. This is called phenolic resin A.
[0116] Furthermore, the obtained phenol resin was diluted with carbitol acetate to obtain a varnish with a solid content of 80%. The obtained varnish is called varnish A.
[0117] [Phenolic resin synthesis example 2]
[0118] Add 200 parts of depolymerization product A, 250 parts of p-hydroxybenzoic acid, and 0.5 part of dibutyltin oxide into a 500ml four-neck detachable round-bottomed flas...
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