车用聚氨酯泡沫材料VOC及气味改进综述

分析了车用聚氨酯泡沫材料气味来源,综合概述了当前车用聚氨酯泡沫材料挥发性有机化合物(VOC)和气味控制技术方面研究进展。首先以聚氨酯泡沫材料两大原料即聚醚多元醇及异氰酸酯为对象,从低气味聚醚多元醇的开发和异氰酸酯单体替代等方面介绍了降低聚氨酯泡沫VOC及气味的方法;其次从生产聚氨酯泡沫的各种助剂,包括催化剂、硅酮表面活性剂、脱模剂和除醛剂等方面详细总结了聚氨酯泡沫VOC含量及气味的控制方法。     

聚醚多元醇的合成研究进展

详细介绍了近年来开发的新型催化剂如双金属氰化物(DMC)、CsOH、碱土金属化合物、金属卟啉络合物、磷腈类、三(五氟苯基)硼烷等在聚醚多元醇合成中的应用情况,并比较了其优缺点。简要综述了几种烷氧基化聚合反应器的优缺点。详细介绍了制备低气味、低VOC(挥发性有机物含量)聚醚多元醇的4种途径。最后指出,聚醚多元醇的主要发展方向是窄化相对分子质量分布、降低末端不饱和度以及降低气味和VOC等。     

一种低气味高活性接枝聚醚多元醇

对比了离子交换树脂工艺聚醚多元醇LEP–4801LV及后续接枝聚醚LHH–500L与传统酸中和工艺聚醚多元醇及其接枝聚醚在醛含量、总碳VOC(挥发性有机物)以及气味上的表现,同时将接枝聚醚制成模塑泡沫,对气味、五苯三醛等VOC进行测试对比。结果表明,离子交换树脂工艺聚醚多元醇所得接枝聚醚LHH–500L可明显改善下游制品的气味和VOC。     

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.     

低VOC高活性聚醚多元醇JQN-330NG的合成研究

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。     

聚醚多元醇YEP–4700在高回弹泡沫中的应用

采用新起始剂和合成工艺制备出高相对分子质量、高官能度的高活性聚醚多元醇YEP–4700,并用于低气味、低挥发性有机化合物(VOC)高回弹泡沫塑料的制备。此聚醚多元醇的应用可减少高回弹组合料中聚合物多元醇(POP)的用量,从而减少气味、VOC等有害物质来源,并有效降低高回弹泡沫的密度,提高泡沫的回弹性和抗压强度,实现泡沫轻量化。     

蓖麻油基聚醚多元醇的制备及其表征

以双金属氰化物(DMC)为催化剂、蓖麻油为起始剂制备了新型蓖麻油基聚醚多元醇.采用傅立叶变换红外(FTIR)、核磁共振(1H-NMR)、凝胶色谱(GPc)及热失重(TG)等分析手段对合成产物的结构和热稳定性进行表征.结果表明,蓖麻油基聚醚多元醇结构中既含有蓖麻油的酯基和双键,又含有聚醚的烷基醚基团;本实验的蓖麻油基聚醚多元醇相对分子质量分布随相对分子质量的增大而变窄;与普通聚醚多元醇相比具有更高的热稳定性.     

聚醚多元醇工艺技术进展及市场分析

聚醚多元醇是聚氨酯泡沫塑料业用量最大的多元醇原料,俗称"白料"。从3个方面介绍聚醚多元醇的工艺技术进展,包括近年开发的新型催化剂、脱挥发性有机物(VOC)技术以及国内外主要反应器;通过分析全球及国内产能概况、国内供需以及进出口情况,预测未来国内聚醚多元醇产能仍保持增长趋势。     

聚合物多元醇合成与应用

简要论述了聚合物多元醇（苯乙烯－丙烯腈共聚物接枝聚醚）的发展历史、合成反应原理,介绍了其生产工艺和应用,对基础聚醚、单体、引发剂、链转移剂、分散剂等原料的作用及其选择进行了较为详细的讨论。     

新型高活性聚醚多元醇的制备及应用

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。     

焦油一次汽化温度计算方法的探讨

利用相平衡原理得出的焦油蒸馏时一次汽化温度的计算方法,其结果与按经验公式的计算结果进行了比较,同时讨论了一次汽化温度与焦油馏分产率及二段蒸发器过热蒸汽用量的关系。     

Techniques for screening adhesives for structural applications

—Due to its chemistry, no structural adhesive system (epoxies, acrylics, etc.) is likely to offer an ideal combination of toughness, strength, moisture resistance, and ambient-temperature curing. Therefore, for effective use of adhesives in primary structures, an engineer must be able to identify adhesives that represent an optimum compromise among the different properties. In this paper, we present techniques for screening high-strength, ambient-temperature-curing adhesives for (1) moisture resistance under sustained loading and (2) fracture resistance in a way that is directly related to joint performance.     

Efficacy for Whitlockite for Augmenting Spinal Fusion

Whitlockite (WH) is the second most abundant inorganic component of human bone, accounting for approximately 25% of bone tissue. This study investigated the role of WH in bone remodeling and formation in a mouse spinal fusion model. Specifically, morphology and composition analysis, tests of porosity and surface area, thermogravimetric analysis, an ion-release test, and a cell viability test were conducted to analyze the properties of bone substitutes. The MagOss group received WH, Group A received 100% beta-tricalcium phosphate (β-TCP), Group B received 100% hydroxyapatite (HAp), Group C received 30% HAp/70% β-TCP, and Group D received 60% HAp/40% β-TCP (n = 10 each). All mice were sacrificed 6 weeks after implantation, and micro-CT, hematoxylin and eosin (HE) staining, and Masson trichome (MT) staining and immunohistochemistry were performed. The MagOss group showed more homogeneous and smaller grains, and nanopores (<500 nm) were found in only the MagOss group. On micro-CT, the MagOss group showed larger fusion mass and better graft incorporation into the decorticate mouse spine than other groups. In the in vivo experiment with HE staining, the MagOss group showed the highest new bone area (mean: decortication group, 9.50%; A, 15.08%; B, 15.70%; C, 14.76%; D, 14.70%; MagOss, 22.69%; p < 0.0001). In MT staining, the MagOss group demonstrated the highest new bone area (mean: decortication group, 15.62%; A, 21.41%; B, 22.86%; C, 23.07%; D, 22.47%; MagOss, 26.29%; p < 0.0001). In an immunohistochemical analysis for osteocalcin, osteopontin, and CD31, the MagOss group showed a higher positive area than other groups. WH showed comparable bone conductivity to HAp and β-TCP and increased new bone formation. WH is likely to be used as an improved bone substitute with better bone conductivity than HAp and β-TCP.     

Demand Increases for New Fungicides for Rice

<正> After June this year China's regions growingmiddle and late rice had widespread blastand sheath/culm blight.Such diseasesplagued 19.2 million hectares.Starting fromJuly the market for new fungicides that cancontrol blast and sheath/culm blight for ricewas more and more active.Makers of traditional pesticides for thecontrol of blast have to contend with fiercecompetition from new pesticides in marketthis year.Kitazine,iprobenfos,isoprothiolane and tricyclazole,oftenused by farmers in the past,are graduallybeing replaced by new varieties with high