MDF纤维中脲醛胶含量的定量分析

脲醛树脂胶是中密度纤维板生产的常用胶种,它的用量直接关系到产品的生产成本和产品质量及性能.本文利用在X-射线的照射下,不同的金属离子具有对应的波长衍射,含量的多少反映为衍射强度的原理,应用X-射线衍射仪(WDXRF)对MDF所含的脲醛树脂胶(UF)的含量进行定量分析.分析中采用与胶料固含量2.4%的比例将硫酸铜(CuSO45H2O)与脲醛树脂胶均匀混合和并按照生产工艺的施胶要求加入到纤维的方法,使铜离子成为UF胶料的分布标记.并通过实验室的标准含量的样品和衍射强度之间关系进行标定,从而实现对UF树脂胶料的定量测量.结果表明,Cu离子的波段位置清晰,X-射线的衍射强度和金属含量之间存在良好相关性,并以此建立了中密度纤维板中UF树脂胶含量和X-射线衍射强度之间的线性关系式.经验表明这一关系是精确可靠的.

Analysis of compounds in dichloromethane extractives for Sawara Falsecypress （Chamaecyparis pisifera） outer heartwood

The chemical components of dichloromethane extractives for Sawara Falsecypress heartwood were analyzed with GC/MS except for basic chemical composition analysis for heartwood with Chinese standard method. 14 kinds of compounds were idenfifjed according to the computer compounds library data. The major compounds in dichloromethane extractives comprised of terpene and naphthalene derivafives. The experiments of antifungal effects of the dichloromethane extractive on Aspergillus niger were also carded out. The result showed that the dichloromethane extractive from Sawara Falsecypress has no or weak antifungal capability.