theads

常见例句

Using adipate as a starting material,a new curing agent,tetrahydroxyethyladipicdiamide(THEAD) was prepared by esterification and acylamide reaction with potassium hydroxide as a catalyst.
以己二酸爲原料,經酯化反應和醯胺化反應(以氫氧化鉀爲催化劑),制備了四羥乙基己二醯胺,探討了催化劑、反應溫度和反應時間對産品收率和羥值的影響。
thead gauge
螺紋槼
thead pitch gauge
螺距槼