共查询到17条相似文献,搜索用时 156 毫秒
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低毒脲醛树脂固化物的甲醛释放 总被引:5,自引:1,他引:4
对不同固化体系下三种低毒脲醛树脂固化物随环境变化的甲醛释放量进行了具体研究。试验结果表明:固化体系不同,脲醛树脂的甲醛释放量有很大差别。随着温度的升高,甲醛释放量明显增加;随着时间的变化,脲醛树脂固化物的甲醛释放量逐渐减少,第5天以后逐渐趋于稳定。用三聚氰胺进行改性的脲醛树脂的甲醛释放量明显低于未加任何改性剂的脲醛树脂。 相似文献
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简述刨花板中甲醛释放的机理及检测 总被引:4,自引:0,他引:4
甲醛是甲醛系胶粘剂板制品在使用过程散发的一种污染环境的有害气体。根据国内外资料分析了我国花板甲醛释放的现状,介绍了脲醛树脂的水解和刨花板甲醛释放的机理,评述了8种检测方法和降低花板中甲醛释放量的具体措施。 相似文献
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人造板中的甲醛释放及其检测方法 总被引:7,自引:1,他引:7
对人造板产品中的游离甲醛问题列出了近年来抽查检验的结果及其统计分析,介绍了甲醛释放机理和6种检测方法及降低人造板中游离甲醛的具体措施。 相似文献
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Nuno A. Costa João Pereira João Ferra Paulo Cruz Jorge Martins Fernão D. Magalhães Adélio Mendes Luísa H. Carvalho 《Wood Science and Technology》2013,47(6):1261-1272
This work examines the performance of three formaldehyde scavengers in wood-based panels. Sodium metabisulfite, ammonium bisulfite and urea were applied in different physical forms during particleboard production, and the resulting physico-mechanical properties (internal bond strength, thickness swelling, density and moisture content) and formaldehyde emission levels were compared. Formaldehyde content was measured using the perforator method, and formaldehyde emission was evaluated both by desiccator and gas analysis methods. The chemical reactions involved in each formaldehyde scavenging process are proposed and discussed. The tested scavengers showed distinct performances under the different emission testing conditions, which were interpreted in terms of the stability of the chemical compounds formed upon formaldehyde capture. Sodium metabisulfite proved to be an excellent scavenger for all formaldehyde methods allowing the production of particleboard panels with zero formaldehyde emission. 相似文献
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采用1 m3气候箱法测试2种浸渍胶膜纸饰面人造板甲醛释放规律以及不同处理条件对板材甲醛释放浓度的影响。结果表明,热压工艺、基材结构可能是影响甲醛释放周期的关键因素,2种饰面人造板的平衡周期基本相同;封边处理可有效降低甲醛含量得释放;温度和相对湿度与板材甲醛释放量呈正相关,空气交换率与板材甲醛释放量呈负相关。 相似文献
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国内外胶合板甲醛散发研究 总被引:3,自引:0,他引:3
从胶合板甲醛散发测试方法、影响因素及控制方法3方面,概述了国内外胶合板甲醛释放的研究。建议在国内系统深入地开展相关研究,以期推动国产胶合板甲醛散发控制的标准化和工业化,与国际接轨。 相似文献
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国外人造板甲醛散发研究现状 总被引:16,自引:0,他引:16
本文根据大量的国外文献资料综述了人造板中游离甲醛产生的原因、甲醛散发量的定量测试方法、影响甲醛向外界散发的诸种因素以及降低人造板甲醛散发量的各种措施。 相似文献
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Preparation and properties of waste tea leaves particleboard 总被引:4,自引:0,他引:4
Shi Jin-shu Li Jian-zhang Fan Yong-ming Ma Hong-xia 《中国林学(英文版)》2006,8(1):41-45
Urea-formaldehyde (UF) adhesive is the main source of formaldehyde emission from UF-bonded boards. The components in waste tea leaves can react with formaldehyde to serve as a raw material in the production of low formaldehyde emission boards. In our study, waste tea leaves and UF adhesive were employed in the preparation of waste tea leaves particleboard (WTLB). An orthogonal experimental method was applied to investigate the effects of process parameters on formaldehyde emission and mechanical properties of WTLB. The results indicated that: 1) waste tea leaves had the ability to abate formaldehyde emission from boards; and 2) density of the WTLB was a significant factor affecting its modulus of rupture (MOR), modulus of elasticity (MOE) and internal bonding (IB). 相似文献