制作过程中加入吊白块，用酸碱滴定法分别测定水豆腐压滤液、离浆液和蒸馏液中甲醛含量。
The formaldehyde contents in tofu filtrate, liquid separated from beancurd and the distillate of beancurd were measured by acid-base titration.
通过分批加入尿素的方法，将尿素、 甲醛、 阻燃剂P800和硼砂反应制备阻燃脲醛树脂。
The fire-retardant urea-formaldehyde resins were synthesized with urea and formaldehyde and P800 and borax.
采用加入疏水性树脂和甲醛捕捉剂的方法对脲醛树脂进行了改性。
The water resistant low formaldehyde content urea-formaldehyde resin was prepared by adding hydrophobic resin and formaldehyde collecting agent.
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