以下为句子列表：
英文: By using the othogonal test of L9(3^3), the regeneration of ureaformaldehyde gel, was studied and the optimum operation conditions were determined: the mass ratio of formaldehyde (37%) to gels is 2.5:1, the final motar ratio of regenerative resin is 1.3:1
中文: 摘要选用正交L9(3^3)试验研究了脲醛树脂凝胶的再生树脂，分析试验结果得出了脲醛树脂凝胶的再生树脂的最佳工艺条件：甲醛(37%)与树脂凝胶质量比为2.5:1，再生树脂的甲醛与尿素终物质的量比1.3:1。
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