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运用超声空化作用处理漂白和炭化竹材以期提高竹材表面性能,提高胶黏剂在竹材表面上的浸润性,进而提高竹层积材的胶合剪切强度。分析了不同超声处理工艺对竹材表面粗糙度和表面润湿性的影响;测试分析了超声处理竹片制成的竹层积材的胶合剪切强度变化。结果表明:超声空化作用能够提高竹材表面粗糙度、降低酚醛树脂胶在竹材表面的接触角,提高酚醛树脂在竹材表面浸润性。超声工艺参数对竹层积材胶合剪切强度的影响程度由大到小依次是温度、功率、时间,竹层积材胶合剪切强度表明:相比较于未处理的竹层积材,经最优超声工艺处理后的漂白竹层积材胶合剪切强度提升18%,炭化竹层积材胶合剪切强度提升12.5%,说明超声提高了竹材表面粗糙度和表面润湿性进而增强了竹材与酚醛胶黏剂的机械耦合作用。总体来看,漂白竹材表面粗糙度大于炭化竹材、润湿性弱于炭化竹材,漂白竹层积材胶合剪切强度大于炭化竹层积材。 相似文献
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不同因素对竹/杨复合规格材性能影响 总被引:1,自引:0,他引:1
基于目前以规格竹条为单元制备竹集成材,存在单元尺寸小、出材率较低、劳动力成本高等问题,研究以无刻痕竹展平板为单元制备新型竹集成材,以有效改善生产效率,降低成本。以尺寸规格化的无刻痕竹展平板和杨木单板为原材料,制备展平竹-杨木-展平竹三层组坯结构的竹/杨复合规格材,运用单因素试验方法,探讨胶合界面方式、胶黏剂和杨木单板厚度三个因素对竹/杨复合规格材抗弯性能、胶合强度以及尺寸稳定性的影响。结果表明:以竹黄面-杨木-竹黄面胶合界面复合方式,采用脲醛树脂胶黏剂与2 mm厚杨木单板制备的竹/杨复合规格材整体性能较优。研究结论为今后新型竹集成材的制备奠定基础。 相似文献
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本研究以竹单板和多孔泡沫铝为原料,采用卡夫特AB胶、环氧树脂胶和酚醛树脂胶等三种胶黏剂将竹单板与泡沫铝黏合成型,制备竹单板/泡沫铝夹芯复合板材。探究了不同胶黏剂种类及施胶量对竹单板/泡沫铝夹板材力学性能、吸水性能和胶层形貌的影响。结果表明:采用水溶性酚醛树脂作为胶黏剂,施胶量为340 g·m-2时所制备的板材,其静曲强度、弹性模量及胶合强度均达到最大值,24 h吸水厚度膨胀率和72 h吸水率达到最低值,竹单板和泡沫铝的胶合界面黏合更紧密,证明板材的综合性能最优,最适于工业化生产和实际推广利用。 相似文献
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改性豆基蛋白胶黏剂的胶合工艺初探 总被引:2,自引:0,他引:2
以杨木单板为试材研究了改性豆基蛋白胶黏剂的胶合性能,采用单因素实验方法,探讨了改性豆基蛋白胶黏剂压制胶合板的胶合工艺。分析了热压温度、热压时间和涂胶量对三层杨木胶合板胶合性能的影响。结果表明:采用改性后的豆基蛋白胶黏剂,在压力为1.4MPa,温度为165℃左右,热压时间为1.4~1.6 min/mm,涂胶量为220g/m~2,压制的杨木胶合板胶合性能较佳且达到Ⅰ类胶合板的标准。 相似文献
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为验证进口俄罗斯落叶松木材胶合性能,选用4种具代表性的结构用室温固化胶黏剂,根据GB/T 26899—2011《结构用集成材》进行胶合性能试验,对俄罗斯落叶松及胶黏剂的胶合性能进行分析研究。结果表明:对于俄罗斯落叶松,单组份聚氨酯、双组份聚氨酯和水性高分子异氰酸酯3种胶黏剂的胶层剪切强度和胶层剥离率均满足标准要求,其中双组份聚氨酯和水性高分子异氰酸酯胶黏剂胶合性能优异,单组份聚氨酯胶黏剂胶合性能良好;间苯二酚-甲醛树脂胶黏剂的胶合性能虽能达到标准要求,但不推荐作为结构用胶黏剂。 相似文献
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Adhesive bond line stiffness is an important property that plays a significant role in the properties of wood composites, but is typically ignored by methods used for characterizing adhesive quality. This paper proposes a new test method that can measure effective bond line stiffness. The experiments measured the global stiffness of double-lap shear specimens and then calculated an adhesive stiffness property using shear-lag analysis of each specimen’s specific geometry and layer properties. Experiments were done for phenol formaldehyde (PF) and polyvinyl acetate (PVA) bonding wood strands of hybrid poplar and densified hybrid poplar. The stiffness of PF bond lines was an order of magnitude higher than PVA bond lines, and both were affected by the amount of adhesive coverage. The bond line stiffness with densified wood was similar to, or higher than undensified wood despite the lack of penetration of resin into the densified strands. 相似文献
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三聚氰胺脲醛树脂改性酚醛树脂胶粘剂的研究 总被引:2,自引:0,他引:2
采用常规合成的脲醛(UF)或酚醛(PF)树脂胶对多层胶合板贴面时,很容易出现开胶或透胶现象。本研究采用三聚氰胺脲醛(MUF)树脂对PF树脂进行改性,生产浅色改性PF胶粘剂,探讨了MUF与PF树脂摩尔比、混合比、热压条件等对胶液的粘度、缩合度、稳定性、胶层颜色及胶合质量的影响。结果表明,改性后的浅色酚醛树脂胶粘剂筘存性好、固化后胶层近似木材本色、高强耐水、耐候,用来压制的多层实木复合地板可达到GB9846.1~12-88Ⅰ类胶合板要求。 相似文献
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对水性高分子-异氰酸酯胶黏剂(API)主剂进行改性,以提高API的耐水、耐热及胶接硬木的性能。首先对比了不同聚乙烯醇及增塑剂对API性能的影响。然后在API主剂中引入耐水、耐热树脂或外交联剂(三聚氰胺甲醛树脂、酚醛树脂、N-羟甲基丙烯酰胺),讨论了它们对API胶接性能的影响。通过试验得出三聚氰胺甲醛树脂改性API的效果最好,并用正交试验设计优化了主剂的配方,最终合成了适合高档硬木胶接用的水性高分子异氰酸酯胶黏剂。在试验过程中采用日本JIS K6806-2003标准,并用柞木代替桦木提高了胶接难度。 相似文献
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《Wood material science & engineering》2013,8(1-2):29-37
Abstract This paper describes a study on consumer preferences for wooden and non-wooden flooring. The conjoint analysis approach was applied on two populations: customers in a do-it-yourself (DIY) outlet and university students; and for two flooring applications: living room and kitchen. The results showed that floor type was the most important factor for preference formation, followed by environmental certification and warranty. Price and a DVD with installation instructions were of minor importance to the customers. Wooden floorings were preferred to laminate alternatives. University students placed a higher emphasis on ecolabelling, whereas DIY customers focused mainly on the type of flooring. Floor type was a more important attribute for living room applications than for the kitchen, and price was a more important factor when kitchen flooring was considered in comparison with living room flooring. 相似文献
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The development of the shear strength of the phenol–formaldehyde (PF) adhesive bond during curing was investigated. Five different PF adhesive mixtures and 1.1 mm thick peeled beech (Fagus sylvatica L.) veneer were used to produce lap-shear specimens, which were cured at a pressing temperature of 160°C. Dielectric analysis (DEA) and modified ABES (automated bonding evaluation system) were used to evaluate the physical–chemical and mechanical aspects of PF adhesive cure in a miniature hot-press. The degree of cure, which was calculated from conductivity data, was dependent on pressing time and the composition of the PF adhesive. An addition of rye flour to the PF adhesive significantly postponed the curing process as determined by DEA. It was found that the adhesive bond started to develop in the last stage of the curing (vitrification), by which time most of the physical–chemical conversion of the adhesive had been completed. 相似文献