The results showed: the cured urea formaldehyde resins were mainly distributed in small sized particles, but little in large sized particles;
结果表明，已固化的脲醛树脂主要分布在细刨花中，中粗刨花中极少存在；
The fire-retardant urea-formaldehyde resins were synthesized with urea and formaldehyde and P800 and borax.
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 two most important synthetic polyamides are the urea-formaldehyde resins and the various forms of nylon.
两种最重要的合成聚酰胺是脲甲醛树脂和各种形式的尼龙。
The fire-retardant urea-formaldehyde resins with P800 decreased the formaldehyde and improved the fire-retardant property.
含P800的阻燃脲醛树脂能降低游离甲醛量，提高阻燃性能。
The analytic study was also made on molecular structure of urea-formaldehyde resins.
还对脲醛树脂的分子结构进行了分析研究。
The paper developed a new synthetic technology of urea-formaldehyde resins, and the content of free formaldehyde was more than 0.3%.
提出了一种脲醛树脂合成思路，并合成出游离甲醛含量高于0.3%的树脂。
The paper developed a new synthetic technology of urea-formaldehyde resins, and the content of free formaldehyde was more than 0.3%.
提出了一种脲醛树脂合成思路，并合成出游离甲醛含量高于0.3%的树脂。
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