聚醚多元醇后处理的几种方法

综述了近年来国内外学者在聚醚多元醇后处理方面的研究情况,简要介绍了聚醚多元醇精制除钾、纯化除双金属氰化络合物(DMC)以及低气味除挥发性有机化合物(VOC)的3类方法,对聚醚多元醇后处理技术进行了总结,并指出聚醚多元醇后处理技术的发展方向,首先是绿色环保,其次是品质提升,最后是生产效率的提升.     

大豆油多元醇的制备和应用研究进展

综述了大豆油多元醇的合成方法及其工业应用,并分析了过渡金属催化羰基化法、臭氧氧化法、酯交换法和环氧开环法的优缺点,最后指出了未来的研究方向。     

Synthesis and characterization of cobalt nano‐particles through microwave polyol process

This article aims to synthesize and character cobalt nano‐particles through microwave polyol process. At first, cobalt acetate is used as precursor to synthesize cobalt nano‐particles by microwave assisted ethylene glycol in the presence of polyvinylpyrrolidone (PVP) as capping agent. As measured from ion‐coupled plasma (ICP) and thermo‐gravimetric analysis (TGA), the yields of as‐synthesized cobalt particles in average diameters of 40 and 81 nm verified by transmission electronic microscopy (TEM), are 71 and 85%, respectively; and the structure of as‐synthesized cobalt nano‐particle is a face‐center cubic structure analyzed by X‐ray diffraction (XRD). Finally, the as‐synthesized cobalt nano‐particle modified by oleic acid is dispersed in kerosene to character magnetic property. As measured by vibration sample magnetometer (VSM), the saturation magnetisms of cobalt nano‐particles with average diameters of 40 and 81 nm are 39.1 and 29.5 emu/g, respectively, in solution. © 2009 American Institute of Chemical Engineers AIChE J, 2009     

多元醇酯类冷冻机用基础油的合成及其性能

采用新型催化酯化反应工艺合成了新戊基多元醇脂肪酸酯,酯化反应转化率高达98.5%以上;FTIR分析表明,酯的羟基吸收峰消失,表明酯化反应具有高的羟基转化程度.采用该合成工艺制备了冷冻机用基础油,结果表明,基础油性能达到国外同类产品的性能指标.     

微乳化技术在环戊烷型组合聚醚系统中的应用研究

本文研究了加入微乳化剂对环戊烷型组合聚醚系统制成的泡沫制品的导热系数等性能的影响,验证了微乳化技术对环戊烷型组合聚醚系统的有效改进。通过添加适量的复合微乳化剂,能够得到泡沫制品的导热系数低于19.0mW/(m·K)的微乳化环戊烷型组合聚醚,实现了环戊烷发泡体系低导热的重要技术突破。     

Effect of an amine phosphate addition on the foaming characteristics in turbine base oil

Foaming tendency of turbine oil is diverse due to the variance in turbine oil components, including the type and content of additives and base oils. A common amine phosphate (AP) was investigated as an anti-wear additive in turbine oil. According to ASTM D892, the AP exhibited severe foam accumulation when blended with five kinds of polyol esters, respectively. There is a positive correlation between foam accumulation volume and elasticity modulus. Moreover, adding 0.02?wt% defoamer (T921) could reduce foam accumulation volume and elasticity modulus effectively.     

DMSO as solvent on the synthesis of flame-retardant polyether polyols

Polyether polyols with flame-retardant properties are synthesized using glycerol phosphate disodium salt as an initiator and dimethyl sulfoxide (DMSO) as a solvent. The molecular weight of the polyol decreased when higher solvent to initiator ratios were used, revealing that a larger amount of salt was activated. In addition, the larger the amount of activated salt was, the higher the percentage of phosphorous was in the final polyol. Glycerol phosphate disodium salt was still partially insoluble in the studied proportions of DMSO. Thus, the recovery and reuse of this part of the salt for the synthesis of new flame-retardant polyols were evaluated. The recovered salt promoted a shorter induction period because it presented a larger amount of deprotonated hydroxyl groups. In addition, there were no differences between both synthesized polyols, indicating that it is possible to use the recovered salt in the same way as it is used commercially with the advantage of a shorter induction period for polymerization. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47042.     

聚酯多元醇羟值测定方法的比较及优选

本文对测定聚酯多元醇羟值的几种酰化方法进行比较研究,分析了几种方法在测试过程中的适用范围及存在问题。通过比较提出了操作简便,快速适用的乙酸酐-N-甲基咪唑-DMF法,该方法催化酰化反应在45℃水浴中进行,完成一次测定耗时可以由行业标准方法的1～2h缩短至20min,且测试数据与行业标准法测试数据接近。