So the formaldehyde level of urea-formaldehyde resin was improved by many kinds of quaternary ammonium salt and its mechanism was analyzed by XRD, FTIR and SEM in the experiment.
2
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%.
3
含P800的阻燃脲醛树脂能降低游离甲醛量，提高阻燃性能。
The fire-retardant urea-formaldehyde resins with P800 decreased the formaldehyde and improved the fire-retardant property.
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