建立一种测定尿素中缩二脲含量的反相高效液相色谱(HPLC)方法。
A reversed - phase HPLC method was established to determine the biuret content in urea.
采用水培和盆栽法，研究了复混肥中不同含量的缩二脲对作物生长的影响。
In the research, I analyzed the influence on crops caused by different biuret concentrations in compound fertilizers, using pattern of solution culture and potted.
本文介绍了以对苯二酚为添加剂的缓效尿素中缩二脲含量分析方法的试验研究情况。
The analysis method for biuret content in long-efficacy urea using hydroquinone as an additive is studied and tested.
但在生产中要妥善解决尿素浓溶液易结晶堵塞管道以及尿素在高温下易生成缩二脲的问题。
However these troubles of concentrated urea liquor crystallizing and blocking pipe, as well as urea changing into biuret at high temperature should be avoided.
异氰酸酯的改性方法包括氨酯改性、二聚改性、三聚改性、缩二脲改性、碳化二亚胺改性和封闭改性等。
Methods for the modification of isocyanates include process of urethane, dimerization, trimerization, biuret, carbodiimide, and blocking reaction, etc.
以聚氧化丙烯二醇和甲苯二异氰酸酯、一缩二乙二醇等为主要基体材原料，以联二脲（LDA）、聚磷酸铵（APP）作为阻燃剂，制作了聚醚聚氨酯弹性体。
Polyether polyurethane elastomer material was prepared based on polypropylene oxide glycol, toluene diisocyanate (TDI) and DEG as main base meterial, LDA and APP as flame retardants.
丙酰基二茂铁和4-取代氨基脲反应制得8个相应的缩氨基脲1～8，它们均属首次制得。
Propionyl ferrocene reacted with 4-substituted semicarbazides converted into corresponding semicarbazones 1-8, which are not prepared previously.
丙酰基二茂铁和4-取代氨基脲反应制得8个相应的缩氨基脲1～8，它们均属首次制得。
Propionyl ferrocene reacted with 4-substituted semicarbazides converted into corresponding semicarbazones 1-8, which are not prepared previously.
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