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高活性聚醚多元醇的结构探讨 总被引:1,自引:1,他引:0
用环氧乙烷封端的高活性聚醚多元醇是冷熟化聚氨酯材料的基础原料.因其原料易得、工艺过程较简单、成本较低;用它制成的制品具有高弹性、吸能性、高承载性,被广泛用于冷熟化高回弹泡沫、半硬质聚氨酯泡沫、RIM 和 RRIM 制品.国外60年代初已有工业化产品,我国于80年代初也开 相似文献
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将高活性自催化聚醚多元醇应用于高回弹泡沫中,通过发泡实验确定了其自催化活性及与胺类催化剂配合使用时的最佳配比;该聚醚多元醇用于TM体系也可起到催化作用。同时,与用普通聚醚多元醇制得的泡沫相比,用该聚醚多元醇制得的泡沫VOC值明显降低。 相似文献
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对高活性低不饱和度聚醚多元醇的精制进行了研究。实验确定了较佳的中和剂用量、吸附剂种类和用量,精制的高活性低不饱和度聚醚多元醇的性能与进口产品相当。 相似文献
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《化学推进剂与高分子材料》2016,(1):69-73
研究了采用再催化法及自制的低不饱和度端仲羟基聚醚二醇(Mn=1 700)与环氧乙烷(EO)的封端反应,确定了合适的再催化反应催化剂为甲醇钾,其用量为起始聚醚质量的1%。分别采用A法(中和–吸附法)和B法(吸附剂法)对粗低不饱和度高活性聚醚多元醇进行后处理,确定该聚醚的精致工艺。合成的聚醚T220E的环氧乙烷封端含量为聚醚总质量的15%,该聚醚具有不饱和度低、活性高等优点,能用于聚氨酯胶黏剂及弹性体的生产。 相似文献
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着重研究了低挥发性有机物(VOC)含量的高活性聚醚多元醇JQN-330NG合成中,精制工艺的确定以及抗氧剂的添加方式及添加量。采用优化工艺合成的聚醚多元醇JQN-330NG几乎无气味,醛含量低,并且其制备的高回弹聚氨酯泡沫气味等级和VOC含量均较低。 相似文献
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本文讨论了高效液相色谱法测定聚醚中微量醛类物质含量,聚醚多元醇和聚合物多元醇中醛类物质主要包括:甲醛、乙醛、丙烯醛等,它是影响聚醚产品气味的主要因素。其下游产品聚氨酯材料和人们生活息息相关,尤其国家对汽车内环境实行强制性标准政策,迫使聚醚行业降低气味,降低醛类物质含量。本文阐述了聚醚样品前处理衍生方法的确立,利用高效液相色谱法对聚醚中微量醛类物质含量进行测定。 相似文献
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《化学推进剂与高分子材料》2017,(5):8-19
详细介绍了用三(五氟苯基)硼烷为代表的新型Lewis酸催化剂制备高活性聚醚多元醇的工艺,并介绍了该高活性聚醚多元醇在聚氨酯(PU)泡沫及弹性体中的应用情况,指出用该新型聚醚多元醇制备的PU树脂具有优异的固化特性、力学性能、耐水性和湿热稳定性。 相似文献
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简要介绍了聚氨酯泡沫及其原材料聚醚多元醇中挥发性有机物(VOC)的来源及检测方法。从选择新型催化剂体系、改进聚合工艺、改进后处理工艺及在聚醚多元醇中添加稳定剂等方面详细介绍了降低聚醚多元醇VOC含量的技术;同时从脱除残留单体及溶剂、选择新型链转移剂、选择新型自由基引发剂等方面详细总结了降低聚合物多元醇(POP)中VOC含量的技术。 相似文献
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高固含量聚醚型水性聚氨酯的合成与影响因素 总被引:4,自引:2,他引:2
以异佛尔酮二异氰酸酯(IPDI)和六次甲基二异氰酸酯(HDI)为硬段、聚醚(N-220)为软段,二羟甲基丙酸(DMPA)为亲水性物质、乙二胺为后扩链剂和三羟甲基丙烷(TMP)为交联剂等,合成了高固含量的聚醚型水性聚氨酯(WPU)乳液。采用衰减全反射红外光谱(ATR)对其结构进行了表征,并探讨了溶剂(丙酮)和DMPA含量、反应过程中预聚体的黏稠度、扩链剂的加料顺序和扩链时间等因素对WPU乳液固含量的影响。实验结果表明,在保持其他条件不变的情况下,即n(-NCO)∶n(-OH)=1.2∶1、m(HDI)∶m(IPDI)=2∶1和n(TMP中-OH)∶n(聚醚中-OH)=1∶4、w(DMPA)=1.5%(相对于树脂而言)且w(丙酮)=50.4%~75.5%(相对于树脂而言)时,在预聚反应过程中,若体系较稀(即黏度较低),在乳化时先加入乙二胺,待反应4~7min后再加入水,如此易制得稳定的高固含量(40%~46%)聚醚型WPU乳液。 相似文献
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介绍了高固含量聚合物多元醇(HPOP)的特点,综述了HPOP的合成技术研究进展,讨论了HPOP的分析、测试及应用状况,指出具有高稳定性、低黏度的HPOP是今后的研究重点。 相似文献
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Polyether polyols as GPC calibration standards for determination of molecular weight distribution of polyether polyols
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Mohd Azmil Mohd Noor Vahid Sendijarevic Hazimah Abu Hassan Ibrahim Sendijarevic Tuan Noor Maznee Tuan Ismail Hoong Seng Soi Nurul ‘Ain Hanzah Razmah Ghazali 《应用聚合物科学杂志》2015,132(43)
Average molecular weights (Mn, Mw and Mp) are important characteristics of oligomers and polymers, and therefore there is a need to have a precise and reliable determination method. A gel permeation chromatography (GPC) coupled with a single refractive index detector was used to determine the molecular weight distributions of commercial polyether polyols calibrated against a series of polyether polyols with known molecular weights and low polydispersity. Results of these GPC analyses were compared to the ones calibrated against the commercially available polystyrene (PS) standards. The number‐average molecular weights (Mn) obtained with GPC using polyether polyols calibration were closer to the theoretical values than the Mn obtained using PS as calibration standards. Hence, these GPC analyses using polyether polyols as calibration standards can provide reliable determination of molecular weight distribution of polyether polyols and can be potentially applied to natural oil‐based polyols, including palm oil‐based polyols. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42698. 相似文献
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主要介绍了聚酯型聚醚多元醇的合成与应用,讨论了影响聚酯型聚醚多元醇产品质量的主要因素,所研制的聚酯型聚醚多元醇Y–102E与环戊烷相容性良好,并具有优异的泡沫综合性能。 相似文献
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介绍了新型低一元醇含量聚氧化丙烯多元醇的特点及其在聚氨酯弹性体、密封胶等方面的应用性能,指出该类聚醚具有较好的发展前途。 相似文献
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Maria M Velencoso Agustin SB Gonzalez Joaquin C García‐Martínez Maria J Ramos Antonio De Lucas Juan F Rodriguez 《Polymer International》2013,62(5):783-790
A simple strategy for the synthesis and functionalization of polyurethanes is described. Anionic ring‐opening polymerization was combined with ‘click’ chemistry to synthesize polyols with fluorescent properties. This route allows the incorporation of a wide range of functionalities in the polyols with an easy, clean and highly selective process compatible with several types of functional groups. The proposed strategy opens the way to the production, in a cost‐effective way, of ‘smart’ polyurethanes with non‐conventional properties like fire retardancy, antimite properties, antibacterial properties, etc. Alkynyl groups were introduced into the polyol chains by the controlled addition of glycidyl propargyl ether as co‐monomer during a conventional anionic ring‐opening copolymerization with propylene oxide. Subsequently 4‐azidomethyl‐7‐methoxycoumarin molecules were introduced onto the alkynyl‐polyether polyols by copper‐catalysed cycloaddition reactions to produce end‐functionalized polyols. The chemical structure of the novel polyols was characterized using infrared spectroscopy, nuclear magnetic resonance spectroscopy, gel permeation chromatography with triple detection and matrix‐assisted laser desorption/ionization time‐of‐flight mass spectroscopy. These characterization techniques confirmed the presence of a considerable amount of functional groups in the structure of the polyols. Finally, various fluorescent rigid foams, based on the functionalized polyols, were synthesized. Copyright © 2012 Society of Chemical Industry 相似文献