共查询到20条相似文献,搜索用时 93 毫秒
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一种强酸型载银离子交换树脂除碘性能的研究 总被引:1,自引:0,他引:1
制备了一种大孔交联的强酸型离子交换树脂,并将其负载上不同含量的银离子,制备成吸附醋酸中碘离子的吸附剂。该吸附剂的除碘能力随着液时空速的升高而降低。液时空速越高降低得越明显。树脂载银量的提高对提高除碘能力有促进作用,尤其是在载银量较低时效果更明显。该吸附剂在30℃时除碘效果最好,温度升高会造成除碘能力逐渐下降。 相似文献
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全氟磺酰树脂的分析表征 总被引:1,自引:0,他引:1
采用DSC、TGA等仪器对本文制备的质子交换膜燃料电池用全氟碘酰树脂进行了分析表征,同时测定了全氟磺酰树脂的力学性能与交换容量。研究结果表明,本文所制备的全氟磺酰树脂的热性能、力学性能以及交换容量基本符合实际使用的要求。 相似文献
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本文报道了聚氯乙烯多乙烯胺(PVC-PP)树脂催化合成1-碘戊烷并简述了PVC-PP树脂的三相催化机理。 相似文献
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本文报道了聚氯乙烯多乙烯胺(PVC—PP)树脂催化合成l—碘戊烷并简述了PVC—PP树脂的三相催化机理。 相似文献
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玻璃纤维网布涂层用环氧改性氨基树脂合成研究 总被引:1,自引:0,他引:1
研究旨在合成环氧改性氨基树脂,并将其用作玻璃纤维网布涂层.环氧树脂先与三聚氰胺和脲在一定条件下反应,然后再与甲醛反应.这样就可以将环氧树脂引入氨基树脂中,制得环氧改性氨基树脂.这种树脂成膜后具有良好的耐碱、耐水性和硬挺度,可用作玻璃纤维网布涂层. 相似文献
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The degree of resin cure achievable in urea formaldehyde (UF) resin is known to influence the hydrolytic stability of UF resin. In the current study, a significant difference in water extractable resin components has been observed between cured pure resin and that from medium density fiberboard (MDF) panels. Results show some 50 to 70% of resin components may be removed on water extraction from resinated MDF fiber and panel samples. In contrast, cured pure UF resins have only a small fraction of resin mass extractable into water with nitrogen-containing components remaining incorporated into the cured resin. The relatively high resin mass losses from panel material together with loss of nitrogen-containing components suggest not only free urea, but urea-methylene species are labile and readily extractable into water. Wax contributes to differing panel extractability when pressed at either 100 or 160°C, whereas panel resin loading has a significant effect on extractable resin components. A lower resin loading led to relatively greater resin extractability, which was corroborated by the extractability of resin-fiber mixtures up to 50% resin content. An assessment of extracted panel residues suggests a relative decrease of urea and urea-formaldehyde condensation products after water extraction. With UF resin highly mobile on fiber during MDF manufacture, the results suggest resin components may separate, leading to their incomplete incorporation into a cured, cross-linked UF resin matrix, with an implication that resin cure on fiber may not be complete compared to that found with pure resin. 相似文献
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人造板用胶粘剂的发展趋势 总被引:5,自引:0,他引:5
2000年世界人造板的产量为1.54亿m3,耗用370万t胶粘剂。人造板工业使用的三大胶是脲醛树脂胶、酚醛树脂胶和三聚氰胺-甲醛树脂胶。脲醛树脂胶作为主要品种,用量超过250万t/a,降低树脂制备中甲醛/尿素的物料配比、添加甲醛捕集剂是减少甲醛释放量的有效方法,但需引入耐水性物质改善树脂的耐水性;以尿素代替部分三聚氰胺制备三聚氰胺-甲醛树脂,可降低树脂的成本,但要达到较好的耐老化性,三聚氰胺和尿素的比例应大于40:60;提高固化速度、降低固化温度是酚醛树脂的发展趋势,引入金属离子、提高碱性、提高聚合度和外加固化促进剂是主要途径。低毒、优质的木材胶粘剂将越来越受到关注。 相似文献
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