SC型高效催化剂丙烯液相本体聚合

SC型高效催化剂是用无水MgCl_2、醇、蘸、TiCl_4以及添加剂制备的,SC型催化剂和A1Et_3助催化剂、Ph_2Si(OMe)_2外给电子体,用于丙烯液相本体聚合,丙烯在70℃聚合2h具有高效率(大于3万gPP/gCat),得到的聚丙烯等规度(大于98％)和堆密度(大于0.45g/cm~3)高,颗粒形态好,粒度分布窄,聚丙烯的MFR容易用氢调节。     

盘式过滤器及其在锦纶66生产中的应用

介绍了盘式熔体过滤器的内部结构和工作原理 ,将其应用于锦纶 66高强力丝试生产时 ,组件使用周期达 2 1天 ,生产的原丝强度大于 90 .9cN/tex ,能够满足高强力工业丝的工艺条件。     

YS-842催化剂在Hypol工艺PP中试装置上的应用

将Ziegler-Natta高效载体催化剂YS—842在Hypol工艺聚丙烯(PP)中试装置上进行应用考核，考察了该催化剂的适应性及共聚合性能。试验表明，YS—842催化剂活性高(达1．2Mg／g)、寿命长、氢调敏感性好：用YS—842催化剂生产的聚合物流动性好，粒径分布窄，细粉少，平均粒径为640μm；等规指数大于98．5％，堆密度大于0．45g／mL；试生产的F401、J340，其机械性能与使用进口催化剂生产的产品相当。     

卧式一步法丙纶高强丝生产工艺研究

在意大利ＦＡＲＥ公司卧式一步法丙纶高强丝设备上，研究了聚丙烯熔融指数与丙纶高强丝强度的关系。探讨了纺丝温度、冷却条件、单丝纤度、拉伸倍数等主要工艺条件对丙纶高强丝强度的影响。     

Characterisation of three different impellers using the LDV-technique

A characterisation of three commonly used impellers was made in this study by measuring local mean velocities and the fluctuations of these velocities with the LDV technique. The data was used to estimate volumetric flow, velocity fluctuations and turbulent intensity in the impeller region of the tank. The impellers investigated were a high flow impeller, a pitched blade turbine and a Rushton turbine. The cylindrical vessel used was made of Perspex, had a dished bottom (DIN 28013), was equipped with four baffles and had an inner diameter of 0.45 m. It was found that the bulk velocities could be scaled with the tip-speed of the impeller (ND). The flow rate at constant impeller speed increased in the order high flow impeller — Rushton turbine — pitched blade turbine. The corresponding order for the turbulence fluctuation is: high flow impeller — pitched blade turbine — Rushton turbine. The velocity profile of the flow out from the high flow impeller was furthermore, not as smooth as could be expected.     

PET金银镀铝膜专用烘烤漆的配方设计

从金银线专用烘漆的工艺和性能要求出发,探讨了聚酯真空镀铝膜(VMPET)烘漆的配方设计的要素,实验优选出氨基烘漆体系,研究表明氨基树脂和成膜树脂是获得高性能烘漆的重要因素,通过优选氨基烘漆配方各组分,可获得具有较高应用性能的金银线专用烘漆。     

有色双细全牵伸丝的研制开发

从生产实践出发,探讨了33dtex/24f双细全牵伸丝（FDY）丝的生产工艺。在选择工艺参数时应考虑色母粒对纺丝生产的影响。合理地选择纺丝温度、喷丝板孔径、拉伸速度、牵伸倍数可稳定地生产性能良好的FDY丝。     

冷却条件对PA66工业丝生产的影响

探讨了冷却条件对1 400 dtex／208 f PA66工业丝的纺丝性能和物理性能的影响。结果表明,改造侧吹风装置,加装蒸汽环吹和整流板,冷风室内改用弧形板,在其他相同工艺条件下,纺丝的断头次数和废丝率降低,纤维的断裂强度由8．5 cN／dtex提高至8．8 cN／dtex,达到了国外高强力PA66工业丝的质量指标。     

聚硅氧烷在真丝线丝鸣整理上的应用

通过对真丝线丝鸣整理剂的筛选、工艺探讨，拓宽了聚硅氧烷在真丝线整理上的应用，提高了真丝线产品质量     

Rheological changes for urethane polymerizations in bulk and in solution

Viscosity rise and extent of reaction were followed during the step growth polymerization of linear and branched urethanes in bulk and in solution. Results indicate that intra-molecular reaction may exist in both linear and branched systems. Adding solvent increases the extent of intra-molecular reaction. The system viscosity was found to correlate with CgM_w, where C is polymer concentration, g is the ratio of branched to linear polymer radii of gyration, and M_w is the weight-average molecular weight.