Polycarboxylic acids as non-formaldehyde anti-swelling agents for wood
Polycarboxylic acids as non-formaldehyde anti-swelling agents for wood
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DOI：
10.1515/hf.2006.069
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发表时间：
2006-07-01
期刊：
影响因子：
2.4
通讯作者：
Sefc, Bogoslav
中科院分区：
文献类型：
--
作者：
Vukusic, Sandra Bischof;Katovic, Drago;Sefc, Bogoslav
冷杉(Abies Alba Mill)和山毛榉(Fagus sylvatica L.)用多聚羧酸(PCA)进行化学改性，通过对流加热或微波处理固化，并用高效液相色谱法进行分析。以柠檬酸(CA)和1，2，3，4-丁烷四元酸(BTCA)这两种具有代表性的多元羧酸(PCA)为交联剂，合成了一种新型无甲醛交联体系。这些试剂需要以膦为基础的催化剂，因此本研究使用次亚磷酸钠(SHP)催化剂。将PCA处理的效果与以前介绍的1，3-二羟甲基4，5-二羟乙基尿素(DMDHEU)处理进行了比较。用水浸/烘干法测定了改性木材的防胀效率(ASE)，并对其尺寸稳定性进行了测定。结果表明，与DMDHEU相比，PCA改性木材的ASE有所提高。结合酸的定性和定量测定采用高效液相色谱法。通过使用微波处理，进一步强化了木材改性过程，提高了木质材料的质量。除了其他好处外，木材和试剂组分之间的交联剂的形成导致了拉伸强度保留率的提高，特别是在与微波处理相结合的情况下。
Wood specimens of fir (Abies alba Mill) and beech (Fagus sylvatica L.) were chemically modified using polycarboxylic acids (PCA), cured by convection heating or microwave treatment and analyzed by HPLC. A new nonformaldehyde cross-linking system was composed of citric acid (CA) and 1,2,3,4-butanetetracarboxylic acid (BTCA), which are representative polycarboxylic acids (PCAs). These reagents require phosphono-based catalysts, so a sodium hypophosphite (SHP) catalyst was used in this study. The effects of PCA treatment were compared with a previously introduced 1,3-dimethylol 4,5-dihydroxy ethylene urea (DMDHEU) treatment. The dimensional stability of the modified wood was determined in terms of the anti-swelling efficiency (ASE) using the water soak/oven dry method. The results revealed an improvement in ASE for wood modified with PCA compared to modification with DMDHEU. Qualitative and quantitative determinations of bound acids were performed by HPLC. Further intensification of the wood modification process and an increase in the quality of wood-based materials were achieved using microwave treatment. Among other benefits, the formation of crosslinks between the wood and the reagent components led to an improvement in the tensile strength retention, particularly in combination with the microwave treatment.