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《中国胶粘剂》2021,(3)
以硅烷改性聚醚树脂、降黏剂、触变剂、防霉剂和偶联剂等为原料,制备建筑门窗用硅烷改性聚醚胶。研究了不同原料成分及用量对硅烷改性聚醚胶的断裂伸长率、弹性恢复率、拉伸强度和触变性等性能影响以及硅烷改性聚醚胶的可涂饰性能。研究结果表明:硅烷类偶联剂与锆酸酯类偶联剂以1∶1的质量比例混合使用,可提升胶体的断裂伸长率;选择60份的聚醚多元醇作为降黏剂,弹性恢复率最高,可降低胶体黏度;纳米碳酸钙与重质碳酸钙以1∶1的质量比例混合成填料,可提升胶体的拉伸强度、弹性恢复率与断裂伸长率;选择聚酰胺蜡作为触变剂,可有效改善胶体的触变性;添加0.8份的防霉剂,胶体防霉等级达到0级。为确保胶体可涂饰性能,要选取对胶体粘接性强的基材和弹性较高的涂料,并避免使用底漆。 相似文献
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首先通过2,4-甲苯二异氰酸酯(TDI)和聚醚多元醇合成聚氨酯预聚体,然后与γ-氨丙基三乙氧基硅烷(A1100)进行耦合反应,获得硅烷封端聚氨酯(SPU),将其与端硅烷聚醚胶(MS)混合,制备出聚氨酯改性的端硅烷聚醚(SPU-MS)密封胶。通过流变特性、拉伸强度、拉伸剪切、耐黄变及DMA的测试分析,发现在保证胶透明性的情况下,SPU能有效改善胶的力学性能和粘接强度,同时仍具有较好的耐黄变性和低温柔韧性。当SPU含量为30%,所制备SPU-MS胶表干时间为2.9h,固化胶条透光率为91%,拉伸强度1.23MPa,拉伸剪切强度为0.75MPa,低温柔韧性较好,7d曝晒仅出现轻微变色。 相似文献
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《有机硅材料》2018,(6)
以硅烷改性聚醚为基胶,加入增塑剂、填料、触变剂、紫外线吸收剂、抗氧化剂及催化剂等,制备了一种装配式建筑用双组分硅烷改性聚醚(MS)密封胶。研究了不同种类的基胶、增塑剂、填料、触变剂、耐老化剂、催化剂对硅烷改性聚醚密封胶性能的影响,筛选出了制备MS密封胶适合的原料:以S810硅烷改性聚醚为基胶,PPG-3000为增塑剂,CCS-18、CCS-25纳米碳酸钙(质量比1∶1)复配作为填料,聚酰胺蜡作触变剂,Tinuvin 326紫外吸收剂与抗氧剂Irganox 1076 (质量比1∶1)复配作为耐老化剂,以十二胺和辛酸亚锡复配作为催化体系,制备的装配式建筑专用双组分MS胶硫化后,100%定伸模量为0. 2 MPa,拉伸强度为0. 89 MPa,拉断伸长率为950%,弹性回复率为89%,综合性能较优,可满足装配式建筑的填缝要求。 相似文献
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通过连续溶液聚合制备聚甲基丙烯酸甲酯-甲基丙烯酸羟丙酯(PMMA-HMA)活性树脂中间体,用乙烯基三
乙氧基硅烷(KH-151)对其改性,得到硅烷改性丙烯酸树脂(SMA)溶液,制备了硅烷改性聚醚(MS)密封胶与混凝土之间
的底涂剂,并研究KH-151用量对SMA的疏水性和对MS密封胶-混凝土试件粘结性的影响。结果表明:KH-151与丙烯酸
树脂发生了共聚反应;增大KH-151用量可明显增强SMA的疏水性和提高MS密封胶与混凝土之间的粘结性,当KH-151
相对于PMMA-HMA的质量分数为8%时,MS密封胶-混凝土试件通过浸水后的拉伸试验。 相似文献
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安徽大学研究者选择聚醚多元醇、端羟基聚丁二烯、甲苯二异氰酸酯、γ-氨丙基三乙氧基硅烷等为主要原料,在制出聚氨酯预聚物之后,又添加助剂与填料,最终制得单组分湿固化聚氨酯密封胶。由于采用聚丁二烯改性和端硅烷化两项工艺革新,促使该胶的表干时间延长,粘接性能提高,拉伸强度有所增进,断裂伸长率降低。该胶拓展了聚氨酯胶粘剂的实用领域,市场前景较佳。 相似文献
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Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn3−x Cox(PO4 )2, with x = 0.4–1.6, were formed at temperatures up to 950°C; all exhibited the structure of γ-Zn3 (PO4 )2. Solid solutions of orthophosphates of composition Zn3−x Cux (PO4 )2 exhibited more-complex behavior. At 1000°C and copper contents of 20–80 mol%, a phase that is related to Cu3 (PO4 )2, termed here the "ε-phase," predominated. At 850°–950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the "η-phase") adopted the structure of graftonite. At 800°–900°C and 10–15 mol% of copper, the solid solutions exhibited a new structure (the "δ-phase"), which we found to be related to the mineral sarcopside. At temperatures 950°C, the solutions that contained 5–15 mol% of copper (the "β-phase") had the structure of β-Zn3 (PO4 )2, whereas at 800°–850°C, solutions with 5 mol% of copper (the "-phase") exhibited the structure of γ-Zn3 (PO4 )2. Attempts to synthesize Cu+ ZnPO4 and Cu+ Cu2+ Zn3 (PO4 )3 were unsuccessful. 相似文献
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为了提高油田的生产效率,设计最佳的油气集输处理的工艺流程,更好地完成油气水分离处理的任务。对油气集输工艺技术进行优化,发挥高效油气水分离处理设备的优势,提高油气水处理的质量,保证油气集输工艺顺利实施,获得最佳的油田产量外输。 相似文献
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建设创新型国家是我们中华民族的历史责任。“自主创新、重点突破、支撑发展、引领未来”的16字方针应当成为我们未来创新活动的指南。建设创新型国家把自主创新放在首位,并提出了引领未来的高标准要求。钢铁科技创新必须突出重点,抓住创新成果产业化这个关键,支撑起行业和国民经济的发展。 相似文献
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相比已经完善丰富的开采和勘探技术,油气的运输以及储存却仍然存在不足之处。我国对能源安全提出更加严格要求的同时,对区域经济的发展规划也有足够重视。因此,保障油气管道的安全则成为了我国能源安全战略的重中之重。在阐释油气管道现阶段在储运安全保障技术发展状况的基础上,分析了现存的问题及解决问题的手段,并指出未来可能使用的目标策略,为今后研究者提供一定程度上的借鉴经验。 相似文献
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膜的污染和劣化及其防治对策 总被引:25,自引:0,他引:25
较为系统地介绍了膜污染和劣化的定义和特点,因膜污染和劣化而造成的膜性能变化,以及如何预防、减少或清除膜污染和劣化的一些通用方法。 相似文献
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James L. White David G. Salladay David O. Quisenberry Donald L. MacLean 《应用聚合物科学杂志》1972,16(11):2811-2827
Gel permeation chromatographic (GPC) and thin-layer chromatographic (TLC) studies of polystyrene, polybutadienes (BR), and their copolymers (SBR) have been carried out. GPC primarily separates them on the basis of molecular size, and TLC, on the basis of composition. Methods of obtaining absolute molecular weight distributions for BR and SBR based upon variations of the Strasbourg Universal Calibration procedure are described. In particular, [η]–M relationships in both the GPC solvent (THF) and in a second solvent (toluene) were used; in addition, results of statistical mechanical calculations for \documentclass{article}\pagestyle{empty}\begin{document}$\overline {s^2 }$\end{document} (based on the assumption of negligible steric hindrance and freely rotating bonds) were applied. An experimental comparison of these methods was carried out, and use of the [η]–M relationships for both solvents was found to give satisfactory results. The predictions of the statistical theory were too low. A detailed study of polymer–solvent–gel interaction in the GPC unit was made through investigation of ternary phase equilibrium in the (polystyrene)–THF–(polymer) system. The polymers studied included BR and SBR with varying styrene contents. Experimental techniques for TLC separations of BR, SBR, and polystyrene according to the composition are described. 相似文献