脲醛树脂胶黏剂在纤维板热解固体产物中的转化特性

Conversion characteristics of urea formaldehyde resin adhesive in fiberboard through pyrolysis into solid product

在自制热解反应炉内对纤维板及其原料木纤维、脲醛树脂胶黏剂进行热解试验,采用X线光电子能谱、傅里叶红外光谱和元素分析等方法对热解样品和固体产物进行比较,分析纤维板热解过程和热解产物的构成特征及转化规律,探讨脲醛树脂胶黏剂在纤维板热解固体产物中的转化特性。结果表明:含氮化合物在纤维板中的存在形式为伯胺和酰胺结构,热解后主要以环状的吡啶和吡咯的小分子结构存在于热解固体产物中。氮元素在纤维板中的相对含量为5.01%,在热解固体产物中相对含量为4.69%,残留量较高。脲醛树脂胶黏剂致使炭化固体产物的碱性增强。

The transformation of nitrogen compoundsin medium density fiber board （MDF） , wood fiber and urea formaldehyde（UF） resin had been focused on in this work. Pyrolysis experiments were carried out in the laboratory-scale furnace. Pyrolysis samples and solid products were studied by XPS, FTIR and elemental analysis to study the pyrolysis process and product of MDF. The experimental results showed that the existing form of nitrogen compounds in MDF was mainly structure of primary amines and amide. The existing forms of nitrogen compounds in MDF char were pyridine and pyrrole. The nitrogen content of MDF was 5.01% before pyrolysis and 4.69% after pyrolysis with high residual rate. The pyrolysis solid product of MDF was alkalic because of UF adhesive.