Synthesis and process optimization of high-ortho thermosetting phenolic resin
The proximity induction effect of different divalent metal ion catalysts on high-ortho phenolic resin(HOPF)was studied,and the HOPF was prepared using zinc acetate(Zn(Ac)2)as catalyst,and the structure of HOPF was characterized and analyzed.The effects of catalyst dosage,reaction time and aldehyde/phenol ratio(F/P)on the ortho/para-hydroxymethyl ratio(O/P),free aldehyde content,gel time and curing characteristics of HOPF were studied by orthogonal experiments.The results showed that the ortho-hydroxymethyl content of HOPF resin synthesized by Zn(Ac)2 was high(hydroxymethyl index was 0.47)and the curing speed was fast(gel time was 202 seconds at 150 ℃).The optimal synthesis process of HOPF was as follows:reaction time 240 min,aldehyde/phenol ratio 1.1,and catalyst dosage 3％.
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