Initial heating of the phenol and formaldehyde (in the presence of an acid or base to get the reaction going) produced a shellac-like liquid good for coating surfaces like a varnish.
开始加热,酚和甲醛(需有酸或碱促使其反应进行)便产生了像紫胶样的液体,能像清漆一样涂于物体表面。
2
In this paper a PLC controlled induction heating system is presented base on the analysis of medium frequency parallel converter.