共查询到17条相似文献,搜索用时 96 毫秒
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基于木素填料的脲醛树脂胶粘剂研究 总被引:2,自引:1,他引:1
研究了面粉、碱木素和木素磺酸钙对脲醛树脂(UF)胶粘剂性能的影响,探讨了碱木素、木素磺酸钙用作胶粘剂填料的可行性。研究结果表明:UF胶粘剂的固含量随着填料用量的增加而增大;UF胶粘剂的固化时间和pH值随面粉或木素磺酸钙用量的增加而降低,却随碱木素用量的增加而增大;使用含木素填料的UF胶粘剂压制胶合板,当w(木素)=15%~20%、施胶量为240~260g/m2时,胶合板的湿态胶合强度略高于纯UF胶粘剂压制的胶合板;以m(面粉)∶m(木素)=1∶1作为混合填料,其干态胶合强度远高于国家标准,并且均高于1.05MPa,其湿态胶合强度能达到国际标准。 相似文献
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基于膨润土的脲醛树脂填料的开发与性能研究 总被引:4,自引:2,他引:2
比较了面粉、膨润土及其用量对脲醛(UF)树脂胶粘剂的pH值、固含量、固化时间和胶合强度的影响,探讨了膨润土用作胶粘剂填料的可行性。研究结果表明:随着膨润土用量的增加,UF树脂胶粘剂的pH值、固化时间和固含量呈递增趋势,游离甲醛含量明显下降;随着面粉用量的增加,UF树脂胶粘剂的固含量和固化时间呈递增趋势(但增幅比膨润土体系小),pH值有所降低;用添加膨润土的UF树脂胶粘剂生产的胶合板,当w(膨润土)≤20%、施胶量为280~300 g/m2时,胶合板的湿态胶合强度(1.69 MPa)比面粉体系(1.53 MPa)和纯UF树脂胶粘剂体系(1.09 MPa)的高,其湿态胶合强度能达到GB 9 846-1988的标准,而干态胶合强度则远高于GB 9 846-1988标准。 相似文献
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利用AR-M-AR粉对脲醛树脂(UF树脂)进行增强和降低游离甲醛释放量研究结果表明,由羟甲基化三聚氰胺和烷基间苯二酚制成的线型AR-M-AN粉能显著提高UF树脂胶合板的胶接强度,特别是胶合耐水性,并能明显地减少UF树脂胶合板的游离甲醛释放量。但是,对于在强酸性条件下合成的部分UF树脂添加AR-M-AR粉后胶接强度下降。 相似文献
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以小麦蛋白(WG)和缩合单宁(CTs)为原料,制备了无甲醛的生物基木材胶粘剂。利用蒙脱土、高岭土、重质碳酸钙、轻质碳酸钙和羟基磷灰石为填料进行改性,采用共混的方式制备填料改性复合胶粘剂。考察了无机填料种类对WG/CTs复合胶粘剂性能的影响,并进行耐水胶合强度、扫描电子显微镜(SEM)、热重分析仪、沸水煮不溶率、黏度等测试分析。研究结果表明:加入填料后,WG/CTs复合胶粘剂的黏度均有不同程度的增大,胶粘剂的热稳定性也比对照组胶粘剂有所提高;不同无机填料改性胶粘剂的耐水性存在显著差异,但胶合板的湿态强度均超过0.7 MPa,达到国家II类胶合板标准的要求;沸水煮不溶率测试结果显示,轻质碳酸钙改善了胶粘剂的耐水性;SEM图和胶层裂纹评估显示,重质碳酸钙、轻质碳酸钙与胶粘剂具有良好的相容性,表明碳酸钙填料对胶层的韧性没有影响,是较好的填料选择。 相似文献
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以三聚氰胺草酸盐(MOX)和氯化铵分别作为脲醛树脂(UF)的固化剂,然后以相应的改性UF胶粘剂压制胶合板,并探讨了不同固化剂对UF的固化时间、胶合板的胶接强度和甲醛释放量等影响。结果表明:以MOX作为固化剂时,相应UF的固化速率相对较慢,由该改性UF胶粘剂压制而成的胶合板,其胶接强度相对较高,甲醛释放量略高于含氯化铵体系;含MOX固化剂的UF胶粘剂,其DSC曲线峰顶温度(86.22℃)和吸热量(51.14 J/mg)低于含氯化铵体系,并且含MOX体系的固化反应比较平稳。 相似文献
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将尿素与两种活性化合物在一定条件下进行共缩聚反应,合成了尿素-化合物L-化合物R共缩聚(ULR)初期树脂。通过胶合板制造实验、力学性能测试以及甲醛释放量测试,初步探讨了ULR树脂作为胶粘剂应用于胶合板制造的可能性。结果表明:一定反应条件下,反应时间对ULR树脂的粘度影响不大;面粉添加量对ULR树脂胶接胶合板的胶合强度影响较大;当反应时间为120min、面粉添加量为15%时,ULR树脂胶接胶合板的胶合强度能够满足国家标准(≥0.7MPa),甲醛释放量接近0。因此,ULR树脂作为胶粘剂应用于胶合板制造是可行的。 相似文献
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以十六烷基三甲基溴化铵(CTAB)、十二烷基三甲基溴化铵(DTAB)和CTAB/DTAB分别作为蒙脱土(MMT)的改性剂,制成了相应的有机插层剂(如CTAB-MMT、DTAB-MMT和OMMT等);然后采用复合插层法制成了压制胶合板用有机插层剂/脲醛树脂(CTAB-MMT/UF、DTAB-MMT/UF和OMMT/UF)复合胶粘剂。结果表明:OMMT的层间结构最优;当w(OMMT)=3%时,相应的OMMT/UF复合胶粘剂的综合性能最好,由其压制而成的胶合板的粘接强度和游离甲醛释放量均满足相关标准要求。 相似文献
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采用自制的可溶性三聚氰胺-甲醛低聚物作为脲醛树脂的添加剂,通过DSC及压制胶合板等方法评价该低聚物对脲醛树脂的固化特性、游离甲醛释放量和胶合强度的影响.结果表明,对于nF/nU为1.1的脲醛树脂UF1.随着三聚氰胺-甲醛低聚物加入量的增加,树脂固化活化能和胶合板的甲醛释放量都呈现先降低后增加的趋势,而胶合强度变化趋势不... 相似文献
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以聚乙烯醇(PVA)和三聚氰胺为改性剂,制备出一种环保型UF(脲醛树脂)胶粘剂。探讨了三聚氰胺的添加方式(包括其添加量、初期和中期投入比例等)对UF性能的影响。结果表明:在试验工艺条件下,当w(总三聚氰胺)=6%(相对于尿素质量而言)、w(前期三聚氰胺)=1%和w(中期三聚氰胺)=5%时,胶合板的甲醛释放量(0.27 mg/L)相对最低,胶接强度(0.71 MPa)达到II类板的标准要求;当w(前期三聚氰胺)=w(中期三聚氰胺)=3%时,胶合板的胶接强度(0.76 MPa)相对最高,但甲醛释放量(0.56 mg/L)只能达到E1级标准要求。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(14):1715-1724
In this work the influence of FRW-1 fire retardant treatment on the bonding strength of plywood was studied. The results showed that the bonding strength of FRW-1 fire-retardant-treated Poplar plywood decreased by 25.3% as compared to untreated plywood; furthermore, free formaldehyde in the fire-retardant-treated Poplar plywood decreased by 64.9% when compared to untreated plywood. In our studies we also analyzed: the pH value and the buffering capacity of fire-retardant-treated and untreated wood powder; and the influence of FRW-1 fire retardant treatment on the gelation time of urea-formaldehyde (UF) adhesives. The results show that FRW-1 fire retardants reduced the pH value and increased the buffering capacity of FRW-1 fire-retardant-treated wood powder. The gelation time of the UF adhesive mixed with FRW-1 fire-retardanttreated wood powder was shortened by 15% as compared with the untreated wood powder. The results of the scanning electron microscope analysis showed that the FRW-1 fire retardant was mainly confined to: the trachea lumen of the Poplar wood; the wall of trachea; as well as around the pits when using an impregnation method at ambient temperature and pressure. It is possible that this has led to the decrease in mechanical action between the veneer and the adhesive. 相似文献
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To lower the formaldehyde emission of wood‐based composite panels bonded with urea–formaldehyde (UF) resin adhesive, this study investigated the influence of acrylamide copolymerization of UF resin adhesives to their chemical structure and performance such as formaldehyde emission, adhesion strength, and mechanical properties of plywood. The acrylamide‐copolymerized UF resin adhesives dramatically reduced the formaldehyde emission of plywood. The 13C‐NMR spectra indicated that the acrylamide has been copolymerized by reacting with either methylene glycol remained or methylol group of UF resin, which subsequently contributed in lowering the formaldehyde emission. In addition, an optimum level for the acrylamide for the copolymerization of UF resin adhesives was determined as 1%, when the formaldehyde emission and adhesion strength of plywood were taken into consideration. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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Cem Sensogut Murat Ozalp Huseyin Yesil 《International Journal of Adhesion and Adhesives》2009,29(5):589-592
In this study, the effects of borax pentahydrate addition to urea formaldehyde (UF) on the bonding characteristics and free formaldehyde content have been studied. Experiments related to the bending strength, withdrawal shear strength and free formaldehyde content have been conducted on the three-layered beech and poplar plywood which are prepared by the addition of borax pentahydrate into their adhesive mixtures in certain amounts. Addition of borax pentahydrate into the adhesive mixture did not statistically affect the bending strength and withdrawal shear strength of the plywood but did reduce the free formaldehyde content. 相似文献