申请人:Kashima oil Co., Ltd.
公开号:EP1055690A1
公开(公告)日:2000-11-29
A process for producing a modified phenolic resin, comprising heating a heavy oil or pitch of given average molecular weight and, per mol, calculated from the average molecular weight, of the heavy oil or pitch; 0.3 to 25 mol, in terms of formaldehyde, a formaldehyde compound and 0.5 to 50 mol of a phenol of the formula (I) (wherein R1 represents a linear or branched unsaturated hydrocarbon group having 1 to 2 unsaturated bonds and having 2 to 10 carbon atoms, p is 1 or 2, X represents an alkyl group having 1 to 5 carbon atoms, and q is 0 or 1) under stirring in the presence of an acid catalyst to thereby effect a polycondensation.
The modified phenolic resin obtained by this process, as compared with the conventional modified phenolic resin produced from a heavy oil or pitch as a feedstock, has an extremely low softening point so as to be flowable at about room temperature and has also a low melt viscosity, thereby ensuring very excellent moldability. Further, in combination with an epoxy resin, the modified phenolic resin can be formed into a molded article which is excellent in not only heat resistance, moisture resistance, corrosion resistance and adhesive force but also mechanical properties such as dimensional stability and strength.
一种生产改性酚醛树脂的工艺,包括加热给定平均分子量的重油或沥青,以平均分子量计算,每摩尔重油或沥青;0.3至25摩尔(以甲醛计)甲醛化合物和0.在酸催化剂的存在下,在搅拌下加入 0.5 至 50 摩尔的式 (I) 苯酚(其中 R1 代表具有 1 至 2 个不饱和键且具有 2 至 10 个碳原子的线性或支链不饱和烃基,p 为 1 或 2,X 代表具有 1 至 5 个碳原子的烷基,q 为 0 或 1),从而实现缩聚。
与传统的以重油或沥青为原料生产的改性酚醛树脂相比,通过该工艺获得的改性酚醛树脂具有极低的软化点,因此在室温下即可流动,同时还具有较低的熔体粘度,从而确保了极佳的成型性。此外,将改性酚醛树脂与环氧树脂结合使用,还可制成模塑制品,这种制品不仅具有优异的耐热性、防潮性、耐腐蚀性和粘合力,而且还具有优异的机械性能,如尺寸稳定性和强度。