共查询到20条相似文献,搜索用时 93 毫秒
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对松香的酯化及聚合反应中使用的催化剂做了详尽的概述,讨论了酯化和聚合反应中所用催化剂的优缺点,并对松香改性产品的应用前景进行了展望。在酯化松香和聚合松香生产绿色化的趋势下,提出研制价廉、环境友好、高活性的催化剂是其未来发展的重点。 相似文献
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采用甘油、季戊四醇制备印刷油墨用的松香改性酚醛树脂的工艺中,催化剂的用量对树脂的性能(如粘度、相容性)有明显影响。 相似文献
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松香与富马酸、马来酸、马来酸酐或丙烯酸进行Diels Alder加成反应生成多羧基化合物,然后再与醇、胺或烷醇胺进行反应,得到水溶性树脂。本文重点介绍这些水溶性树脂的研究进展及其在水性油墨中的应用情况。 相似文献
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A high adhesion polyurethane acrylate (HPUA) was synthesized from isophorone diisocyanate (IPDI), hydroxyethyl acrylate (HEA) and hydrogenated rosin. The chemical structure was characterized by 1H NMR and FTIR; storage modulus and glass transition temperature (Tg) were measured with dynamic mechanical analyzer. Real time infrared spectroscopy (RTIR) was used to investigate the effect of different concentrations of photoinitiator on the double bond conversion of HPUA. Real time volume shrinkage and adhesion on glass, poly(ethylene terephthalate) (PET), polycarbonate (PC) and polyvinyl chloride (PVC) substrates were also measured by laser micrometer and universal testing machine. Results showed that this kind of HPUA has a high photopolymerization rate, low volume shrinkage and high adhesion compared with commercial polyurethane acrylate competitor. 相似文献
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松香歧化反应的新型催化剂研究 总被引:4,自引:1,他引:3
采用先进的纳米技术制备催化剂,开发出了用于松香歧化反应的非贵金属纳米催化剂,并对其用于松香歧化的工艺条件进行了考察。实验表明,溶胶-凝胶-沉淀法制备的N/L-T催化剂,在500 ℃焙烧2.5 h,经预处理(用氢气在300 ℃还原3 h),具有较高的催化活性。并得出歧化松香的最佳制备工艺为:反应温度270 ℃,反应时间3 h,催化剂用量为2.5%。 相似文献
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María Luisa Barrueso-Martínez Teresa del Pilar Ferrándiz-Gómez María Dolores Romero-Sánchez José Miguel Martín-Martínez 《The Journal of Adhesion》2013,89(8-9):805-824
Different amounts (50-170 php--parts per hundred parts of EVA, 33-63 wt%) of two tackifiers (hydrogenated rosin ester, polyterpene resin) were added to an ethylene vinyl acetate (EVA) copolymer containing 28 wt% vinyl acetate. The EVA and the tackifier were characterized using infrared (IR) spectroscopy, DSC measurements, and stress-controlled plate-plate rheology. The properties and compatibility of the EVA-tackifier mixtures were studied using DSC, DMTA, and stress-controlled plate-plate rheology. Immediate adhesion was measured as a quantification of tack, and the T-peel strength of roughened styrene-butadiene rubber/EVA-tackifier adhesive joints was also obtained. The increase in the amount of tackifier noticeably changed the crystallinity of polyethylene blocks in the EVA, and the temperature at the cross-over between the curves of the storage and loss moduli as a function of the temperature was displaced to a lower value. Whereas the hydrogenated rosin ester was compatible with the amorphous ethylene vinyl acetate copolymer regions of the EVA (Tg value increased) reducing its crystallinity, the polyterpene resin was compatible with the polyethylene blocks of the EVA (T g value was not modified), increasing its crystallinity. Immediate adhesion of the EVA-tackifier mixtures was improved by adding both hydrogenated rosin ester and polyterpene tackifiers. On the other hand, there was an optimum tackifier content at which the maximum T-peel strength value was obtained. 相似文献
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通过一步法工艺由松香、壬基酚、顺丁烯二酸酐、固体甲醛、季戊四醇等合成松香改性壬基酚醛树脂,考察了不同组分、配比对树脂黏度、软化点、正庚烷值的影响,确定了最佳组分、配比和工艺条件:壬基酚、固体甲醛总用量为反应物投入总量的35%,壬基酚、固体甲醛摩尔比固定为1∶2,松香与多元醇摩尔比固定为1∶0.98,顺丁烯二酸酐用量为3%,多元醇为季戊四醇,催化剂为分步加入. 相似文献