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低游离甲醛脲醛树脂胶粘剂的研制 总被引:15,自引:1,他引:15
尿醛树脂胶粘剂中的游离甲醛是人造板中主要的污染源。采用降低原料中甲醛和尿素摩尔比 ,分批加入尿素进行多次缩聚的方法降低游离甲醛的含量 ,并通过添加聚乙烯醇改性剂 ,使产品中游离甲醛的含量为 0 4 % ,产品陈放 1周后 ,游离甲醛降到 0 1%以下 ,完全可以满足环境保护的要求。该制备工艺简单 ,成本低 相似文献
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多元酚——甲醛树脂中游离酚,游离醛含量的测定 总被引:6,自引:0,他引:6
多元酚--甲醛树脂是本院开发的热固粘接剂新产品,本文给出了这一产品技术指标中游离酚、游离醛含量的测定方法,并对方法进行了讨论。 相似文献
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铸造用糠醇改性脲醛树脂中游离甲醛的研究 总被引:3,自引:1,他引:2
本文分析了糠醇改性脲醛树脂中游离甲醛产生的机理,介绍了几种降低游离甲醛的可行方法。并提出了一种低游离醛糠醇改性脲醛树脂的合成方法。 相似文献
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室内装修后微量甲醛的检测与治理 总被引:2,自引:0,他引:2
本研究采用电化学传感器检测法对新装修室内空气质量和家具释放甲醛量进行检测。使用生物酶甲醛消除剂,对其去除室内空气和家具中甲醛性能进行了测试研究。研究结果表明,甲醛消除剂可以快速、有效地消除室内空气中的甲醛,又可以减少室内装修材料中游离甲醛的释放,是治理室内空气甲醛污染的有效手段之一。 相似文献
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尿素—苯酚—甲醛树脂胶粘剂的研制 总被引:3,自引:0,他引:3
本文研究了由苯酚、甲醛和尿素为主要原料制备尿素-苯酚-甲醛(简写为UPF)树脂胶粘剂的配比及工艺条件。制得的胶粘剂的游离酚、游离醛含量低,水溶性、贮存性好,原料成本低,适用于浸渍作保温材料的矿物纤维。 相似文献
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To remove formaldehyde effectively, we used activated carbon fiber as a carrier to prepare the composite materials (biological enzyme/activated carbon fiber) by loading biological enzyme on its surface. A one‐factor‐at‐a‐time design and orthogonal design were used in the experimental design methods to optimize the biological enzyme based on soya protein. The experimental results indicate that the pH value was the most significant condition for optimizing the biological enzyme. The optimum orthogonal design conditions were proposed to be a reaction temperature of 80°C, a pH of 4, a reaction time of 6 h, and an amino nitrogen content of up to 5.4%. In addition, the morphologies of the composite materials were characterized with scanning electron microscopy, and the removal efficiency of formaldehyde was investigated with the acetyl acetone method. The results show that the formaldehyde removal efficiency was the best and the removal rate was 80% when the loading time was 8 h. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2619–2623, 2013 相似文献
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主要阐述了去除甲醛气体的常用材料(吸附材料、催化氧化材料、光催化降解材料和生物技术材料)的研究进展,文中指出碳基材料、分子筛、有机金属骨架常常被用作吸附挥发性有机气体,它们具备丰富的孔道结构和较大的比表面积,碳基材料和分子筛表面存在大量丰富的基团能够有效地增大甲醛的吸附容量,提高甲醛的吸附效率;有机金属骨架表面的金属与甲醛结合成键,有效提高材料的化学吸附;以金属氧化物为载体的材料常被用作催化氧化甲醛分子,将甲醛分子转化为无毒性的二氧化碳和水;半导体材料TiO2常被用作光催化降解材料去除甲醛;除此之外还有一些利用生物技术来去除甲醛气体。本文对比了不同材料去除甲醛的优劣性,对不同的去除材料改性研究进行了归纳总结。 相似文献
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Summary We describe the synthesis of monodisperse prepolymers containing one or two blocked isocyanate groups on the chain extremities.The prepolymers containing blocked isocyanate in one end and hydroxyl group in the other end are obtained by chemical transformation of undecylenic acid to acid chloride. This later was converted to the isocyanate by the CURTIUS reaction and blocked with nonyl-phenol. Finally the blocked isocyanate was telomerized with mercapto-ethanol. The resulting product is deblocked at T=105°C.By action of pure 2.4 T.D.I. (Tolylene diisocyanate) on the later product, we obtain a product containing blocked isocyanate end groups. The removal of the blocking agent could be effected at 100°C or less depending on the compound used to remove the blocking agent (amine). 相似文献
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高浓度甲醛废水预处理技术研究 总被引:1,自引:0,他引:1
采用石灰对高浓度甲醛废水进行预处理,考察了甲醛初始浓度、[Ca(OH)2]/[HCHO]摩尔比、反应温度、催化剂种类等因素对甲醛去除效果的影响。结果表明:甲醛初始浓度越高、[Ca(OH)2]/[HCHO]摩尔比越大、反应温度越高,反应趋于平衡的时间越短,甲醛的去除率亦越高。对一定浓度的甲醛废水,适宜的反应温度是65℃、适宜的[Ca(OH)2]/[HCHO]摩尔比值约为0.1。此外,实验还发现,只有当Ca2+和OH-同时存在时才能催化甲醛的去除,其它金属氢氧化物或氯化钙对甲醛的去除几乎没有催化作用。 相似文献
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为进一步提高脉冲放电等离子降解甲醛的效率,增加CO2选择性,降低O3产生量,研究采用放电等离子体和催化剂协同技术。实验以分子筛为载体,分别制备了Mn/TiO2-分子筛、Fe/TiO2-分子筛和Cu/TiO2-分子筛3种催化剂,并利用XRD、SEM、EDS、FT-IR方法对催化剂进行表征分析。进行了脉冲放电等离子体协同3种催化剂降解甲醛的研究,比较了不同催化剂协同等离子体对甲醛去除率、CO2选择性、O3产生量的影响。结果表明,3种催化剂与脉冲放电等离子体都存在协同作用,并能有效地提高甲醛去除率,增加CO2选择性,降低O3产生量。当脉冲电压为20kV、放电频率为40Hz、气体流量为0.5L/min时,Mn/TiO2-分子筛催化剂协同效果最佳,甲醛去除率为94.4%,CO2选择性为42.2%。催化剂表征结果显示Mn/TiO2-分子筛的活性组分颗粒分布均匀,锐钛矿相的TiO2和微晶状态的MnOx的存在有效促进了甲醛的氧化分解。研究还对放电等离子体协同Mn/TiO2-分子筛催化剂降解甲醛的机理进行了探讨。 相似文献
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As the formaldehyde is one of the main indoor pollutants, the purpose of this study is to effectively remove indoor formaldehyde pollution by using environmentally friendly 3D printing ornaments. The wood 3D printing filaments cellulose/polylactic acid composite (Cellu/P) was selected as the starting material, and 3-aminopropyltriethoxysilane (APTES) was used for chemical modification to obtain a series of cellulose composite materials with amino groups. The modified composite materials (APTES@Cellu/P) were characterized by Fourier transform infrared, X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy, thermogravimetric analysis, and mechanical tests, and a formaldehyde removal experiment was performed. The feasibility of 3D printing was evaluated, and the process of 3D printing-functionalized customized ornaments was proposed, and then a school emblem was used for modeling, printing, and surface modification. Compared with the commercially traditional activated carbon, 3D printing-customized ornaments of APTES@Cellu/P material has a better formaldehyde removal effect, and can even avoid the secondary pollution that is common to the activated carbon. 相似文献
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室内多种建筑材料释放出的甲醛,对人类的生存危害极大。因此,用TiO2光催化剂降解气相甲醛成为一个研究热点。文章回顾了近年来用TiO2光催化剂降解气相甲醛取得的成果。 相似文献