shellac varnish 又称虫胶清漆。俗名泡立水(polish)或淡金水。一种醇溶清漆。 由紫胶片(俗名洋干漆)溶解在乙醇中而成的棕色半透明液体。涂刷后迅速干燥,留下一层紫胶的薄膜,具有优良的硬度和电绝缘性,并可经抛光打磨而显出光亮的色泽。但膜质较脆,耐热性和耐气候性也较差。 主要用于涂刷木器和电器绝缘材料,不宜外用。
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。
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.
紫胶,虫胶由紫胶虫分泌的沉积于树上的树脂分泌物,用于制造虫胶清漆。
A resinous secretion of the lac insect deposited on trees and used in making shellac.
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