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在浸渍胶膜纸生产中,要经常测定UF树脂的固化时间。在生产中应用铁丝制做的搅拌棒测定固化时间时发现,铁丝的使用次数不同,会使UF树脂的固化时间产生波动。由于固化时间的差异,直接影响了生产中的调胶工艺、浸胶工艺及浸渍胶膜纸的压贴工艺,直至影响到饰面效果,造成不必要的损失。经过大量对比试验,选用玻璃棒替代铁丝做搅拌棒,经测定,UF树脂的固化时间稳定,保证了生产线的正常运行,提高了产品质量。 相似文献
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采用动态力学分析法和示差扫描量热法,胶样为甲阶酚醛树脂胸,将胶预置于干燥的预固化环境中。随着预固化程度的增加,试样在DMA等温扫描过程中的tgδ曲线下区域减小;这个区域用来实验测量甲阶酚醛树脂的物理固化率。同理,随着预固化程度的增加,DSC放热区域减小;这个区域用来测量树脂的化学固化率。 相似文献
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氢化萜烯马来酸酐与环氧树脂固化反应特性研究 总被引:3,自引:2,他引:1
采用FT-IR光谱研究了氢化萜烯马来酸酐(HTMA)与双酚A型环氧树脂的固化反应过程,并分析了固化度、凝胶时间及其主要影响因素.实验结果表明:HTMA与环氧树脂的固化反应过程与促进剂作用下的酸酐固化环氧树脂的交联反应机理一致;固化度随温度升高、时间延长而提高,而凝胶时间随温度升高、促进剂用量的增加明显缩短.HTMA与双酚A型环氧树脂在110℃、8h以上可完全固化.空间位阻效应及电子效应的协同作用使HTMA与环氧树脂的固化反应速度降低,固化过程中放热量小,放热平缓. 相似文献
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水泥刨花板快速固化工艺的研究 总被引:7,自引:1,他引:7
以毛白杨、兴安落叶松和普通硅酸盐水泥为主要原料,采用二氧化碳气体喷射法研究水泥刨花板的快速固化工艺,探讨了水灰比、二氧化碳气体压力,养护条件等对水泥反应特征和水泥刨花板性能的影响。结果表明,最佳制板工艺参数为:CO2气体压力0.7MPa,通气时间3min,木灰比0.2(毛白杨)或0.5(落叶松),水灰比0.35(毛白杨)或0.4(落叶松);水灰比不但影响成板的可能性,而且对反应特征和水泥刨花板的力 相似文献
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研制了一种适合“热进-热出”工艺的中温固化水溶性酚醛树脂,该酚醛树脂是在传统的水溶性酚醛树脂合成工艺的基础上,加入一定量的间苯二酚和尿素制成。它可以在115℃时快速固化,降低了酚醛树脂胶的固化温度,缩短了固化时间。采用该酚醛树脂制造的竹胶板能够满足国标要求。 相似文献
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介绍了浸渍纸染色工艺的基本原理和方法、着色剂的基本特性以及一些常用着色剂的主要特点,并对影响浸渍纸染色效果的因素进行了初步的研究,结果表明着色剂与胶液混合时的温度、搅拌速度以及搅拌时间对着色剂的分散,从而对染色质量有重要的影响。 相似文献
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利用国产装饰原纸生产三聚氰胺浸渍胶膜纸的工艺研究 总被引:9,自引:0,他引:9
国产原纸湿强度低 ,p H值低且不均衡 ,纤维分布不均匀 ,灰分含量也低。采用以有机溶剂代替浸渍用树脂中的部分水、施加脱膜剂、加大浸渍纸的浸胶量等措施 ,解决了上述问题对生产的影响 ,生产出符合标准要求的三聚氰胺浸渍胶膜纸 相似文献
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Lisbeth M. Ottosen Thomas Block Morten Nymark Iben V. Christensen 《Wood Science and Technology》2011,45(2):289-302
A new method for copper impregnation of wood in structures was suggested and tested in laboratory scale with specimen of new
pine sapwood. A copper nail and a steel screw were placed in the wood, and an electric direct current field was applied, so
the copper nail was anode and the screw was cathode. At the anode, copper ions were generated. The copper ions were transported
into the wood by electromigration (movement of ions in an applied electric field) towards the cathode, and a volume between
the two electrodes was thereby impregnated. Copper also moved to a lesser degree in the opposite direction, probably due to
capillary effects, and a smaller volume behind the anode was impregnated as well. The impregnation perpendicular to the grain
was limited compared to the one along the grain. The highest Cu concentrations were obtained close to the anode. 相似文献
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Vinícius Gazal Omar Bailez Ana Maria Viana-Bailez Elen L. Aguiar-Menezes Eurípedes B. Menezes 《Wood Science and Technology》2014,48(3):581-590
The termite Nasutitermes corniger is attracted to weathered wood, but it is not known whether this attraction is of chemical or physical nature. This work examines whether wood extracts can change the attraction of N. corniger to a food substrate. In a first experiment, filter paper impregnated with a eucalyptus extract, Eucalyptus grandis, and another one with a solvent were placed in the foraging arena of N. corniger nests under laboratory conditions. The extracts used were from weathered or unweathered wood. During the second experiment, two tests were performed using eucalyptus wood. First, a piece of unweathered wood was impregnated with an extract of weathered wood (treatment) or solvent (control). In the second test, a piece of weathered wood was impregnated with an extract of unweathered wood (treatment) and another one with solvent (control). At the end of the tests, the number of termite recruitment on each substrate was quantified. Filter paper recruited more termites when treated with unweathered wood extracts or with extracts of weathered wood than when impregnated with the solvent. Unweathered wood treated with extracts of weathered wood recruited more termites than the control. However, weathered wood impregnated with extracts of unweathered wood recruited similar numbers of termites as the same wood impregnated with the solvent. It was verified that chemicals from weathered or unweathered wood increased the foraging activity of N. corniger in neutral substrates, but only chemicals from weathered wood altered the attraction of N. corniger to eucalyptus wood. 相似文献
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为考察杨木和辐射松树脂浸渍材的机械加工性能,参照LY/T 2054—2012《锯材机械加工性能评价方法》,分别对杨木和辐射松的素材与树脂浸渍材及其经过真空热处理的树脂浸渍材的刨削、铣削、钻削、开榫和车削5种机械加工性能进行测试评价。结果表明:1)本试验范围内,在综合评分满分40分情况下,杨木素材、树脂浸渍材和真空热处理树脂浸渍材的总评分分别为20分、30分和25分;辐射松素材、树脂浸渍材和真空热处理树脂浸渍材的总评分分别为24分、33分和29分;树脂浸渍材机械加工综合性能最佳,热处理树脂浸渍材次之;2)杨木和辐射松的树脂浸渍材及其真空热处理树脂浸渍材的刨削、铣削性能均为优秀,车削性能均为良好;杨木和辐射松的树脂浸渍材及辐射松真空热处理树脂材开榫性能良好;钻削性能仅辐射松树脂浸渍材达到优秀;3)辐射松素材与改性处理材的机械加工性能均优于杨木,综合比较,辐射松树脂浸渍材具有较佳的机械加工性能。 相似文献
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本文介绍了预油漆纸的种类、基本性能及其在家具表面装饰和室内装修方面的应用,并且着重介绍了后浸型预油漆纸的主要原材料及生产工艺。 相似文献