以尿素和甲醛为原料、苯酚/甘脲为甲醛捕收剂制备脲醛树脂（UF）。增加苯酚/甘脲用量，脲醛树脂中游离甲醛的质量分数降低，固化时间增加。增加缩聚时间，脲醛树脂的黏度增加，游离甲醛的质量分数降低。研究结果表明，当苯酚质量分数为0.5%、甘脲质量分数为0.5%、三聚氰胺质量分数为1%、缩聚时间为20 min时，采用一次性加入甲醛、分批次加入尿素和改性剂的碱-酸-碱合成工艺制备的UF中的游离甲醛的质量分数约为0.042 6%，远低于浙江DB33-T-494的E1级指标。

The urea-formaldehyde resin is synthesized by using urea and formaldehyde as raw materials,and phenol and acetylene-urea as formaldehyde collectors.The content of free formaldehyde in urea-formaldehyde resin will decrease and the curing time of the resin will increase when the dosage amount of phenol and acetylene-urea increases.The content of free formaldehyde will drop and the viscosity of urea-formaldehyde resin will increase if polycondensation time prolongs.The content of free formaldehyde is 0.042 6% in urea-formaldehyde resin prepared by the alkali-acid-alkali synthesis process under conditions that the mass content of phenol,acetylene-urea and melamine is 0.5%,0.5%,and 1% respectively,the polycondensation time takes 20 min,formaldehyde is one off added,and urea and formaldehyde collectors are added in batches.The content of free formaldehyde is far below the E1 grade index of Zhejiang DB33-T-494 standard.

乔正阳(1990-),男,硕士生,研究方向为矿物资源综合利用与开发,1301845084@qq.com