Urea-formaldehyde resin (UFR), a thermosetting resin, is used to prepare ultrafiltration membranes because of its excellent mechanical properties and filtration performance. Herein, a porous ultrafiltration membrane is prepared by coating a mixture of UFR and carboxymethylcellulose (CMC) on the surface of filter paper via a facile acid-curing treatment method. CMC is used as a thickening agent, and hydrochloric acid is used as a curing agent to accelerate composite membrane formation. The mesoporous UFR is embedded in the large pores of the paper matrix by coating treatment, and the presence of CMC can decrease the flowability of the resin. The effects of UFR concentration, CMC dosage, and hydrochloric acid concentration on the performance of the composite ultrafiltration membrane are studied. The ultrafiltration membrane demonstrates a rejection rate of 85% and a pure water flux of 850 L/(m²·h) with the optimized resin concentration, CMC dosage, hydrochloric acid concentration, and coating amount at 30%, 20% (resin dry), 12%, and 250 g/m², respectively.

中文翻译：

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滤纸上涂覆脲醛树脂制备复合超滤膜。

脲醛树脂（UFR）是一种热固性树脂，由于其优异的机械性能和过滤性能，可用于制备超滤膜。在此，通过将UFR和羧甲基纤维素（CMC）的混合物通过易酸固化处理方法涂布在滤纸的表面上来制备多孔超滤膜。CMC用作增稠剂，盐酸用作固化剂以加速复合膜的形成。介孔的UFR通过涂层处理嵌入纸基的大孔中，而CMC的存在会降低树脂的流动性。研究了UFR浓度，CMC用量和盐酸浓度对复合超滤膜性能的影响。² ·h）的最佳树脂浓度，CMC剂量，盐酸浓度和涂层量分别为30 g，20％（树脂干），12％和250 g / m ²。