共查询到20条相似文献,搜索用时 234 毫秒
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在湿法纤维板生产中均出现石蜡流失现象,从而影响防水性能。在“纤维板制造”一书中,提出间接测定石蜡含量的方法。该法用苯对纤维板进行抽提,得到总固体含量A(包括石蜡及松香),再从抽提液中取一部分滴定松香的含量B,则石蜡含量=A-B。 相似文献
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介绍了松香、改性松香及其衍生物在胶粘剂中的应用.应用于胶粘剂的松香有脂松香、未松香和浮油松香:改性松香包括它们的氢化、脱氢、歧化,聚合以及马来酸酐反应后的产物.松香衍生物包括松香和改性松香与各种醇反应生成的松香酯,氯化松香以及与其他物质的共聚物。松香及其衍生物在热熔胶和压敏胶中应用尤其广泛. 相似文献
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介绍了林业行业标准LY/T 1977-2011《木质板材用热熔胶线》的主要内容.该标准结合木质板材用热熔胶线的生产工艺提出了相关技术要求及相应检测方法,以确保对木质板材用热熔胶线的性能评价标准化、规范化,从而充分发挥该标准指导及规范生产的作用. 相似文献
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纤维板防水剂用石蜡-松香乳液的组成及其性能研究 总被引:3,自引:0,他引:3
采用专用高分子表面活性剂和转相法制备了系列石蜡-松香乳液,并考察了这些乳液中的表面活性剂种类和石蜡与松香的质量比对中密度纤维板防水性和力学性能的影响。研究结果表明,用苯乙烯和丙烯酸及其衍生物为单体的高分子表面活性剂(HS)和烷基苯聚氧化乙烯醚衍生物的低分子表面活性剂(LS)的混合物能制得稳定的石蜡-松香乳液。表面活性剂用量为5kg/m^3时石蜡-松香(质量比1:2)乳液使纤维板的吸水厚度膨胀率减少23.8%,而弹性模量增加了12.2%。表面活性剂的组成和石蜡与松香的质量比都显著地影响乳液的性能和使用效果。 相似文献
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对采用乙烯-醋酸乙烯酯共聚树脂和玻璃纤维纱线制作热熔胶线进行了分析研究,通过正交试验确定了乙烯-醋酸乙烯酯共聚树脂制作热熔胶线的最佳方案. 相似文献
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从胶水类型、施胶方法以及关键工艺参数等方面探讨了竹木复合刨花板的生产工艺,综合结果表明,竹木复合刨花板批量生产的工艺参数为:低摩尔比环保树脂胶、搅拌气流式喷胶法、竹刨花比例40%~60%、用胶量70 kg(干胶)·m-3、热压压力2.0 MPa、热压温度170℃、热压时间20 s·mm-1、刨花颗粒(芯层)0.5~1.0 mm、板厚8.8 mm。生产的竹木复合刨花板产品质量执行国家标准,质量可以达到国标A类刨花板一等品标准。 相似文献
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以优级松节油为原料,合成萜烯-马来酸酐加成物(简称TM).再以TM、马来酸酐、二元醇等为基料,合成了几种不饱和聚酯树脂(TM-UP树脂).讨论了不同配方及合成工艺与树脂产品性能的关系,并对其物化性能、树脂浇铸体力学性能及耐腐蚀性能等进行了测试,从中选出了几种综合性能较好、工艺较简单、成本较低的TMA-UP树脂配方.通过比较得知制得的TM-UP树脂性能达到或超过通用型商品UP树脂,完全可代替通用型商品UP树脂应用. 相似文献
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Fire retardancy of melamine-modified urea–formaldehyde resin (MUF) containing intumescent fire-retardant ammonium polyphosphate (APP) (MUF/APP) was conducted by cone calorimeter with surface treatment of medium density fiberboard (MDF). The results showed that the six MUF resins synthesized with different F/(M + U) and M/U molar ratios containing APP significantly improved the fire retardancy of the MDF by prolonging ignition time, reducing heat release rate and total heat release, and decreasing mass loss rate. The fire-retardant properties of the six synthesized MUF/APP acted differently even though each MUF resin containing the same mass ratio of APP. The melamine content in the MUF should not be too high, otherwise it would decrease the fire-retardant properties of MUF/APP. Based on this study, the higher the APP amounts, the better the fire-retardant performance of the resin was. The fire retardancy of MUF/APP increased with the increase in the amount of glue that spread on the material surface. However, only the amount of glue spread exceeded 250 g/m2, whereas the ability of MUF/APP in inhibiting heat release did not increase significantly any longer. 相似文献
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M. Okuma 《Wood Science and Technology》1976,10(1):57-68
Summary The effect of the number and the location of glue lines in the cross section on the bending properties has been studied on plywood bonded with tannin-formaldehyde adhesive. The thickness of glue line has also been investigated. By comparing the theoretical equations with the empirical ones, we can get the thickness of the glue line of wattle tannin adhesive plywood to be 0.15 mm. As for Young's modulus in bending of the glue line in the plywood, it is calculated to be 219 800 kg/cm2 and is larger than that of the glue line of phenolic resin bonded plywood. In relation to the veneer, Young's modulus of the veneer under the condition of plywood assembly seems to be slightly larger than that of the veneer under the free condition.The author wishes to express his gratefulness to CSIRO of Australia for a Fellowship during the tenure of which this research was carried out. The direction and cooperation of Mr. K. F. Plomley, Dr. P. Grossman and Mr. P. Collins, CSIRO of Australia are gratefully acknowledged 相似文献
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