Formaldehyde → Benzoxazines
반응식
[CH2:1]=[O:2].[NH2:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[CH3:10]OCC(O)C>>[O:2]1[C:1]2[CH:10]=[CH:5][CH:6]=[CH:7][C:8]=2[CH:9]=[CH:4][NH:3]1참가 물질
4
반응 조건
- 온도
- 105 °C
실험 절차
The steps include: in a 2 L four-necked glass reactor equipped with a heating mantle, a temperature controller, an electric mixer and a condenser, 200 g of phenolic novolac resin (D) having high proportion of tetra-functional resin monomer and 124.5 g of paraformaldehyde are dissolved thoroughly in the presence of 816 g of a solvent propylene glycol monomethyl ether at 85° C., 169 g of aniline is dropped in the course of 3 hours into the reactor at constant speed by a quantitative pump to proceed the reaction at 85° C. After finishing the dropping addition of aniline, the temperature is kept at 85° C. for aging for 2 hours, then the temperature is raised to 105° C. After water and part of the solvent are removed, a benzoxazine resin solution with 56 wt % solid is obtained. According to gel permeation chromatography (GPC) analysis, the proportion of the tetra-functional resin monomer in this benzoxazine resin is up to 60 area percent (Area %) or more.