竹质无胶模压材剖面密度及化学成分分析

Profile Density and Chemical Composition of Bamboo Non-adhesive Molded Materials

以竹材加工剩余物为原料进行水热处理、高温炭化、水热炭化预处理,并制备成无胶模压材,对其材色、剖面密度、XRD、红外光谱性能进行分析。结果表明:高温炭化、高温水热两者总色差大于水热处理,高温炭化对材色影响要大于水热处理;预处理无胶模压材表面0~2 mm范围内密度增加且升高较快,芯层分布相对均匀,水热炭化无胶模压材总平均密度大于水热处理、高温炭化和未处理且分布均匀;水热处理能提高纤维素结晶度,而高温处理下降了5%,水热炭化降低了3.4%;高温炭化和水热处理对纤维素特征峰没有影响,半纤维和木质素特征峰产生了变化,高温炭化对加工剩余物羰基影响要大于水热处理。

The bamboo residues were used as raw materials for hydrothermal treatment,high temperature carbonization,and hydrothermal carbonization pretreatments,and to prepare non-adhesive molded compact materials.The material color,profile density,XRD and infrared spectrum properties were analyzed.The results showed that the total color difference between high temperature carbonization and high temperature hydrothermal was greater than that of hydrothermal treatment,high temperature carbonization had a greater impact on material color than hydrothermal treatment.The density of the pretreated non-adhesive molded material increased rapidly within the range of 0~2 mm,and the core layer distribution was relatively uniform.The total average density of the hydrothermal carbonized non-adhesive molded material was greater than that of hydrothermal treatment,high temperature carbonization and untreated distribution was uniform.Hydrothermal treatment increased the crystallinity of cellulose,while high temperature treatment reduced 5%and hydrothermal carbonization reduced 3.4%the crystallinity.High temperature carbonization and hydrothermal treatment had no effect on the characteristic peaks of cellulose,but changed the characteristic peaks of semi-fiber and lignin.High-temperature carbonization had a greater effect on the carbonyl group of the processing residue than hydrothermal treatment.