酸碱处理对制备再生桉木颗粒板的影响
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摘要
废弃人造板中的胶黏剂影响人造板的回收利用。笔者利用化学法对废弃桉木颗粒板中的胶黏剂进行处理,分别探究不同浓度的硫酸、甲酸、硝酸、氢氧化钾分解废弃木颗粒板中脲醛树脂的最佳条件。结果表明,在90℃,水浴处理2 h条件下,甲酸浓度大于60%,硫酸浓度大于25%,或硝酸浓度大于25%可完全分解固化后的脲醛胶黏剂;对酸处理后的木颗粒的颜色、形貌、化学性质进行分析,甲酸对木颗粒的形态、颜色影响较小。用酸处理后制得的再生木颗粒板,力学性能相对于未经处理的再生木颗粒板得到显著提高。
Adhesives in waste wood-based panels affect their recycling and reuse. In this paper, chemical method was used to treat the adhesives in waste eucalyptus particleboard. The optimal conditions for decomposition of urea formaldehyde resin in waste board by sulfuric acid, formic acid, nitric acid and potassium hydroxide were investigated respectively. The results showed that when the concentration of formic acid was greater than 60%, the concentration of sulfuric acid was greater than 25%, or the concentration of nitric acid was greater than 25%, the cured urea formaldehyde adhesive could be completely decomposed using a 90℃ water bath for 2 hours. The color, morphology and chemical properties of the regenerated particles after acid treatment were analyzed. Formic acid had little influence on the morphology and color of the wood particles. The mechanical properties of the regenerated particleboard prepared by acid treatment were significantly improved compared with the untreated regenerated particleboard.
Adhesives in waste wood-based panels affect their recycling and reuse. In this paper, chemical method was used to treat the adhesives in waste eucalyptus particleboard. The optimal conditions for decomposition of urea formaldehyde resin in waste board by sulfuric acid, formic acid, nitric acid and potassium hydroxide were investigated respectively. The results showed that when the concentration of formic acid was greater than 60%, the concentration of sulfuric acid was greater than 25%, or the concentration of nitric acid was greater than 25%, the cured urea formaldehyde adhesive could be completely decomposed using a 90℃ water bath for 2 hours. The color, morphology and chemical properties of the regenerated particles after acid treatment were analyzed. Formic acid had little influence on the morphology and color of the wood particles. The mechanical properties of the regenerated particleboard prepared by acid treatment were significantly improved compared with the untreated regenerated particleboard.
引文
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[21]任新宇,王倩.基于全生命周期理论的家具绿色设计策略[J].家具,2018,39(2):63-67.
[22]梁先娥,喻国平,谢序勤.《绿色设计产品评价技术规范浸渍胶膜纸饰面人造板》标准解读[J].家具,2019,40(1):97-101.
[23]管雪松,徐丽.木材纹理之美与应用探究[J].家具与室内装饰,2018(1):70-71.
[24]彭钊云,李敏秀,刘德友,等.定向刨花板家具偏心连接件抗拔性能研究[J].家具与室内装饰,2016(5):86-87.
[2]中国林产工业协会,国家林业局林产工业规划设计院.中国人造板产业报告(精简版)[J].林产工业,2015,42(11):5-17.
[3]黄在华,袁滨,董小岛.利用废旧刨花板及其制品生产再生刨花板[J].林产科技,2004,29(5):40-41.
[4]Roffael E,Dix B,Behn C,et al.Use of UF-bonded recycling particleand fibreboards in MDF-production[J].European Journal of Wood and Wood Products,2010,68(2):121-128.
[5]Czarnecki R,Dziurka D,Lecka J.The use of recycled boards as the substitute for particles in the centre layer of particleboards[J].Electronic Journal of Polish Agricultural Universities,2003,6(2):1.
[6]Vanreppelen K,Kuppens T,Thewys T,et al.Activated carbon from co-pyrolysis of particle board and melamine(urea)formaldehyde resin:A techno-economic evaluation[J].Chemical Engineering Journal,2011,172(2-3):835-846.
[7]Chaharmahali M,Tajvidi M,Najafi S K.Mechanical properties of wood plastic composite panels made from waste fiberboard and particleboard[J].Polymer Composites,2008,29(6):606-610.
[8]刘一星,李淑君,李坚.木陶瓷的制造(Ⅱ)--中密度纤维板木陶瓷[J].东北林业大学学报,2002,30(5):47-49.
[9]Gu J,Hu C,Zhong R,et al.Isolation of cellulose nanocrystals from medium density fiberboards[J].Carbohydrate Polymers,2017,167:70-78.
[10]黄在华,王永利.利用废旧人造板及其制品生产刨花板技术的研究[J].林产工业,2005,32(4):16-19.
[11]Wan H,Wang X M,Barry A,et al.Recycling Wood Composite Panels:Characterizing Recycled Materials[J].Bio Resources,2014,9(4):7554-7565.
[12]张德荣,张颖,金小娟,等.爆破法刨花再生及再生刨花板的制造技术[J].北京林业大学学报,2009,31(S1):136-138.
[13]Lykidis C,Grigoriou A.Quality characteristics of hydrothermally recycled particleboards using various wood recovery parameters[J].International Wood Products Journal,2011,2(1):38-43.
[14]宋先亮,祝婧超,唐孙东日,等.处理条件对再生刨花性能的影响[J].林产工业,2012,39(4):20-23.
[15]宫明,于志明,李青青,等.利用废弃刨花板制造再生刨花板的工艺研究[J].中国人造板,2007(8):34-47.
[16]Zhong R,Gu J,Gao Z,et al.Impacts of urea-formaldehyde resin residue on recycling and reconstitution of wood-based panels[J].International Journal of Adhesion and Adhesives,2017,78:60-66.
[17]张忠涛,王雨.绿色视角下人造板工业用胶黏剂产业发展前景[J].林产工业,2017,44(1):10-13.
[18]杜官本,华毓坤.脲醛树脂结构研究进展[J].林业科学,1999(4):87-93.
[19]郑纲,齐英杰,邹利刚,等.长材刨片机切削过程转矩滑模控制的研究[J].林产工业,2018,45(4):30-33.
[20]姚利宏,徐伟涛,王喜明,等.三维空芯定向刨花板冲击性能研究[J].林产工业,2018,45(5):15-17.
[21]任新宇,王倩.基于全生命周期理论的家具绿色设计策略[J].家具,2018,39(2):63-67.
[22]梁先娥,喻国平,谢序勤.《绿色设计产品评价技术规范浸渍胶膜纸饰面人造板》标准解读[J].家具,2019,40(1):97-101.
[23]管雪松,徐丽.木材纹理之美与应用探究[J].家具与室内装饰,2018(1):70-71.
[24]彭钊云,李敏秀,刘德友,等.定向刨花板家具偏心连接件抗拔性能研究[J].家具与室内装饰,2016(5):86-87.