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依据GB/T14074-2006《木材胶粘剂及其树脂检验方法》中3.16.2的试验方法来测定脲醛胶中游离甲醛含量,探讨测定温度、亚硫酸钠加入后溶液的搅拌时间、碳酸钠加入后溶液的反应时间对脲醛胶中游离甲醛含量的影响。结果表明:测定温度和亚硫酸钠加入后的搅拌时间对脲醛胶的游离甲醛含量有较大的影响,测定温度控制在0-5℃、搅拌时间控制在14～16min,游离甲醛含量测定结果的重现性好;而碳酸钠加入后溶液的反应时间对游离甲醛含量测定结果几乎没有影响。
According to GB / T14074-2006 “wood adhesive and its resin test method” in 3.16.2 test method to determine the free formaldehyde content of urea-formaldehyde glue, to explore the determination of temperature, sodium sulfite solution after the addition of stirring time, the reaction of sodium carbonate added to the solution Effect of Time on Free Formaldehyde in UF. The results showed that the determination of the free formaldehyde content of the urea formaldehyde resin had a significant effect on the determination of the free formaldehyde content of the urea formaldehyde resin. The determination of the temperature and the stirring time were controlled at 14 ℃ to 16 ℃, Good; and sodium carbonate after the reaction time of the solution of formaldehyde content of the results of the test has almost no effect.