【摘要】 以秸秆乙醇残渣(ER)为原料,采用羟甲基化反应制备羟甲基化ER(HER),将HER与脲醛树脂(UF)复合制备秸秆乙醇残渣脲醛复合树脂(HER/UF),对制备条件进行了探讨,通过FT-IR对ER和HER中的木质素进行表征,并通过SEM测试对HER在UF中的分散性进行研究。研究结果表明:HER的羟甲基含量较ER的羟甲基含量有所增加,随着ER用量(以甲醛质量计)增大,HER的羟甲基增加量减少;且HER较ER在UF中具有更好的分散性。ER在其用量为2 000%,Na OH用量(以HER质量计)0.9%的反应体系下,制备的HER综合性能最好,游离甲醛为0.24%,黏度为3 200 m Pa·s。HER替代10%~40%UF时制备的三合板胶合强度均满足Ⅱ类板的要求,甲醛释放量达到E0级,其中HER替代30%UF制备的三合板性能最好。更多还原

【Abstract】 The hydroxymethylated straw ethanol residue( HER) was prepared from the hydroxymethylation of straw ethanol residue( ER). HER and urea-formaldehyde resin( UF) were then blended to fabricate the HER/UF and the preparation conditions were studied. Lignin in ER and HER were characterized by FT-IR and the dispersibilities of ER and HER in UF were analyzed by SEM. The results showed that the content of hydroxymethyl group in HER was more than that in ER. The increment of hydroxymethyl group in HER decreased with the ER dosage( the mass ratio of ER to formaldehyde) increasing. And HER showed better dispersity compared with ER in the UF resin. The HER prepared under the conditions of 2 000% ER dosage and 0. 9%Na OH dosage( the mass ratio of Na OH to HER) had the best performance. Its free formaldehyde was 0. 24% and the viscosity was3 200 m Pa·s. When 10%- 40% UF resin was replaced by HER,formaldehyde emission of the three-ply boards could meet E0 grade and its bonding strength could meet the requirement of type Ⅱ plywood. And the three-ply board that made by 30%HER / UF had the best performance.更多还原