香蕉假茎苯酚液化及其产物树脂化制备胶黏剂

以苯酚为液化试剂、硫酸为催化剂对香蕉假茎进行液化,探讨液化条件对液化反应的影响,并结合傅里叶红外光谱(FT-IR)、热重分析(TGA)和成分分析研究了不同液化时间的液化物性质差别,同时以液化产物制备环氧树脂胶黏剂,并对其性能进行表征。单因素试验结果表明:优化条件为催化剂用量(占原料的质量分数)30%、反应温度150℃、液固比4:1和液化时间90 min; FT-IR分析表明:40 min和90 min液化产物官能团相似且具有芳香衍生物和酚羟基特性;成分分析和TGA分析表明:40 min残渣中纤维素保留量比90 min高;性能测试表明,90 min液化产物环氧树脂胶黏剂的剪切强度可达7.26 MPa,玻璃化温度(T_g)可达78℃。在优化的反应温度、催化剂用量和液固比的条件下,液化时间对残渣率和液化产物官能团的影响较小,但对残渣中纤维素含量的影响较大,液化产物适合制备生物质环氧树脂胶黏剂。

Liquefaction of Banana Pseudo-stem in Phenol and Preparation of Adhesive from Liquefaction Products

Using sulfuric acid as catalyst,the liquefaction of banana pseudo-stem in phenol was investigated and the influences of liquefaction conditions on liquefaction ratio were discussed.Moreover,the liquefaction progress based on reaction time was investigated under the optimal conditions.For different reaction times, the liquefaction characteristics were studied with the analysis of residue compositions,FT-IR and TGA.The epoxy resin was prepared to test mechanical properties.The results showed that the optimal conditions were mass ratio of phenol to raw material 4:1,catalyst dosage 30% (mass ratio relative to the raw material),reaction temperature 150℃ and time 90min.FT-IR analysis showed the groups were similar and contained large aromatic derivations and phenolic hydroxyls for 40 and 90 min product.For 40 min residue, the fiber retention was higher than that of 90 min by composition analysis and TGA.The mechanical test of epoxy resin indicated that the shear adhesive strength of resin based on 90 min-product could get 7.26 MPa and the glass trainsition temperature could get 78℃.Under the optimal conditions,reaction time had less effect on the functional group in product and residue rate,but it affected fiber content in residue.And the product was suitable for preparation of epoxy resin.