低粘度高固含量醋酸乙烯-丙烯酸酯共聚乳液胶粘剂的研制

介绍了一种低粘度、高固体含量的醋酸乙烯-丙烯酸丁酯-丙烯酸异辛酯共聚乳液胶粘剂的合成工艺及性能。该乳液粘度低于2500mPa.s,固体含量≥52%,较低的玻璃化温度和良好的耐水性能,应用于卷烟和防水涂料的生产。     

SiO2/Zn2SnO4/环氧丙烯酸酯涂层的阻燃性能

为了探究复合纳米颗粒对环氧丙烯酸酯（EA）涂层阻燃性能的影响，以十六烷基三甲基溴化铵（CTAB）和正硅酸乙酯（TEOS）为原料合成了介孔二氧化硅纳米颗粒，以ZnCl₂和SnCl₄·5H₂O为原料合成了锡酸锌（Zn₂SnO₄）纳米颗粒，将它们复合制成了介孔二氧化硅/锡酸锌复合纳米颗粒（SiO₂/Zn₂SnO₄），并用X射线粉末衍射仪（XRD）、透射电镜（TEM）对其表征。将所制的纳米颗粒（介孔SiO₂、Zn₂SnO₄、SiO₂/Zn₂SnO₄）与丙烯酸、丙烯酰胺、EA复合，经UV光固化制备出3种涂层（SiO₂/EA、Zn₂SnO₄/EA、SiO₂/Zn₂SnO₄/EA），通过紫外-可见光谱仪、差示扫描量热仪（DSC）及氧指数测定仪等对涂层的透光率、热稳定性、阻燃性能进行测试。结果表明：SiO₂/Zn₂SnO₄/EA涂层的综合性能较佳，当SiO₂/Zn₂SnO₄质量分数为4.85%时，该涂层的热稳定性及阻燃性能最佳，其极限氧指数、燃烧级别、残炭率（500℃下马弗炉煅烧）和硬度分别为31、V-0、17.32 % 及6H。     

医用高分子材料的现状与应用

概述了医用高分子材料的发展现状及其用途,并介绍了医用高分子材料的发展动向。     

Heat Induced Structure Modifications in Polymer‐Layered Silicate Nanocomposites

Summary: The success of the use of layered silicates in polymer nanocomposites, to improve physical and chemical properties is strictly related to a deeper knowledge of the mechanistic aspects on which the final features are grounded. This work shows the temperature induced structural rearrangements of nanocomposites based on poly[ethylene‐co‐(vinyl acetate)] (EVA) intercalated‐organomodified clay (at 3–30 wt.‐% silicate addition) which occur in the range between 75 and 350 °C. In situ high temperature X‐ray diffraction (HT‐XRD) studies have been performed under both nitrogen and air to monitor the modifications of the nanocomposite structure at increasing temperatures under inert/oxidative atmosphere. Heating between 75 and 225 °C, under nitrogen or air, causes the layered silicate to migrate towards the nanocomposite surface and to increase its interlayer distance. The degradation of both the clay organomodifier and the VA units of the EVA polymer seems to play a key role in driving the evolution of the silicate phase in the low temperature range. The structural modifications of the nanocomposites in the high temperature range (250–350 °C), depended on the atmosphere, either inert or oxidizing, in which the samples were heated. Heating under nitrogen led to deintercalation and thus a decrease of the silicate interlayer space, whereas exfoliation was the main process under air leading to an increase of the silicate interlayer space.

Heat induced structural modification of EVA‐clay nanocomposite under nitrogen and air.     

影响有机硅热防护涂层的热导率的因素

以硅树脂为基料,配合中空玻璃微球等填料,制备了有机硅热防护涂层;研究了填料的组合、添加量、规格以及溶剂体系等对有机硅热防护涂层热导率的影响。结果表明,采用表面经过处理的中空玻璃微球和气相法白炭黑A380的组合填料、中空玻璃微球的用量选择60份、并使用酮类溶剂和芳香类溶剂的混合溶剂制成的热防护涂层,其热导率≤0·1W/(m·K),密度≤0·55g/cm3,拉伸强度≥2·0MPa。     

Environmentally benign precipitation copolymerization of methacrylate ester and styrene to make polymeric microspheres in supercritical carbon dioxide

The polymeric microspheres were synthesized by the precipitation copolymerization of glycidyl methacrylate (GMA) with methacrylic acid(MAA) or 2‐hydoxyethyl methacrylate (2‐HEMA) containing styrene (ST) in SC‐CO₂. Scanning electron microscopy (SEM) showed that the products were spherical microparticles, with the addition of MAA and/or 2‐HEMA as the monomer, with diameter of 0.2–2 μm. The effects of copolymerization pressure, temperature, and ratios of GMA/MAA, ST, and/or GMA/2‐HEMA, on the particle size and morphology were investigated in detail. A new experiment setup is proposed for the large amount of production, based on the rule of lower monomer concentration, more stable system, and better use of the present polymerization apparatus. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2425–2431, 2007     

高铁早强矿渣硅酸盐水泥的研制

湖北某水泥厂在８．３万Ｔ立窑水泥生产线上，成功地开发高铁早强矿渣水泥，并通过了国家建材局水泥专家参加的省级鉴定。该水泥具有早强高，硬化快，抗硫酸盐侵蚀和胶凝性能好等性。     

平板浸涂过程中的液膜排液影响因素

针对一端与活性剂溶液池相接的竖直平板浸涂液膜排液过程，基于润滑理论建立了液膜厚度、活性剂浓度及液膜表面速度的演化方程组，通过数值计算分析了Marangoni效应和表面黏度对液膜排液特征的影响。结果表明，Marangoni效应是影响液膜排液过程的重要因素，可导致液膜厚度增加，随Marangoni效应增强可得到更均匀的液膜。液膜表面速度随表面黏度增大而减小，较大的表面黏度将推迟表面速度逆流现象的发生，但其对膜厚均匀度几乎没有影响。     

弹性外墙乳胶漆耐沾污性的研究进展

分析了弹性乳胶漆涂膜污染的机理,并提出提高涂膜耐沾污性的措施.     

利用钛白废酸制高纯度磷酸一铵试验简介

试验表明,用钛白粉生产中副产的w(H2SO4)≈20%的钛白废酸,经浓缩、净化及再稀释后与磷矿粉反应,在加入净化添加剂的条件下制得纯净的湿法磷酸与氨或碳酸氢铵反应,可代替热法磷酸为原料生产相同质量的高纯度磷酸一铵。分析了该工艺的技术可行性和经济可行性,认为所得的纯净磷酸也可加工成其他高纯度磷化工产品。