影响木质-橡胶环保复合材料甲醛释放量的因子分析

Analysis on formaldehyde emission from wood-based rubber environmental composites

【目的】制备环保低毒的木质-橡胶环保复合材料。【方法】采用Design-expert的响应曲面试验分析法分析异氰酸酯(PMDI)、脲醛胶(UF)及木刨花与橡胶颗粒质量比(W/R)对木质-橡胶复合材料甲醛释放量的影响,并对这3个因子的影响机理进行探讨。【结果】W/R和UF对甲醛释放量影响极显著,PMDI对甲醛释放量有一定的影响;建立了PMDI、UF和W/R对甲醛释放量影响的数学拟合方程;得到了制备木质-橡胶环保复合材料的最佳优化方案:异氰酸酯施胶量为5.966%,脲醛胶施胶量为10.004%,木刨花与橡胶颗粒质量比为60/40,在此优化条件下,甲醛释放量为71.15 mg/kg。【结论】PMDI与UF混合胶粘剂可以成功地胶结木刨花和废旧轮胎橡胶颗粒制造低毒环保的复合材料。

[Objective] Analysis on Formaldehyde Emission[FE] from environmental composite consist of wood-particle and waste tire rubber,which are cured by polymeric methylene diphenyl diisocyanate adhesives（PMDI）and Urea-formaldehyde （UF） resins. [Method]The law of formaldehyde emission as affected variables of composite was analyzed and optimized with Response Surface Method （RSM）on the platform of Design-Expert software. Interaction mechanism of 3 variables was probed. [Result] The results exhibit that parameters of wood/rubber and UF are remarkably significant to formaldehyde emission of composite; there were some significance on PMDI to formaldehyde emission. Simulated equation was built through the RSM. Optimal parameters of composite.amour of PMDI is 5. 966% ,UF 10. 004% ,Wood /Rubber-value is 60/40,and formaldehyde emission-value（FE） 71.15 mg/kg. [Conclusion] So wood and waste tire rubber environmental composite can be excellently conducted by PMDI-UF resins.