PU dispersion was chosen as an impregnating agent to produce leather-like sheet on spun-laced nonwoven.Three typical coagulating processes were studied.It was found that the best coagulating process for the chosen PUd...PU dispersion was chosen as an impregnating agent to produce leather-like sheet on spun-laced nonwoven.Three typical coagulating processes were studied.It was found that the best coagulating process for the chosen PUdispersion to get the leather-like sheet was coagulation in a sodium chloride solution.The detailed study of coagu-lating processes in sodium chloride solution was carriedout and optimal condition was obtained.Some experi-mental results were elucidated.Keywords:PU dispersion,coagulating, impregnating,ar-tificial leather,spun-laced nonwoven.展开更多
以自制的纳米锑掺杂氧化锡(ATO)粉体以及Bayhydrol XP 2593水性聚氨酯(PU)分散体为原料,将KH-550表面改性后的纳米ATO-丁二醇浆料、水性PU与助剂等共混复配,制得分散稳定的水性纳米ATO/聚氨酯复合涂料。在玻璃上进行ATO/PU复合涂料的应...以自制的纳米锑掺杂氧化锡(ATO)粉体以及Bayhydrol XP 2593水性聚氨酯(PU)分散体为原料,将KH-550表面改性后的纳米ATO-丁二醇浆料、水性PU与助剂等共混复配,制得分散稳定的水性纳米ATO/聚氨酯复合涂料。在玻璃上进行ATO/PU复合涂料的应用实验,结果表明:涂膜铅笔硬度可达H、划格附着力可达1级。紫外-可见-近红外光谱分析表明:制得的ATO/PU复合涂料涂膜玻璃的可见光透过率可达83.24%,红外阻隔率达到约70%;经该ATO/PU复合涂膜处理的绝热室能降温达6℃。展开更多
In this study, laponite was tested as a mud-making material for drilling fluids. Laponite is a synthetic smectite clay with a structure and composition closely resembling the natural clay mineral hectorite. Commercial...In this study, laponite was tested as a mud-making material for drilling fluids. Laponite is a synthetic smectite clay with a structure and composition closely resembling the natural clay mineral hectorite. Commercially available laponite was characterized by X-ray di ractometry, scanning electron microscopy and infrared spectrometry. Its dispersibility, salt resistance and high-temperature resistance were evaluated. The results showed that laponite possessed superior cation exchange capacity(140.4 mmol/100 g) with interlayer cations of Na^+ and Li^+. Laponite could easily be dispersed in water to yield increased viscosity with no influence from hydration time or temperature. On the other hand, laponite dispersions displayed an excellent heat resistance, with invariant apparent viscosity at high temperatures. For instance, the apparent viscosity of the2 wt% laponite dispersion underwent changes between 22 and 24 mPa s after hot rolling at 180–240 °C for 16 h. Compared to existing mud-making materials, laponite exhibited better mud-making properties. Furthermore, laponite revealed good compatibility with other additives, and the water-based drilling fluids prepared with laponite as mud-making material showed an excellent stability at elevated temperatures and superior performance–cost ratios. Overall, these findings indicated that laponite had an excellent dispersibility at high temperatures and hence would have promising applications as high-temperature mud-making material for preparing water-based drilling fluids designed for ultra-high-temperature environments.展开更多
文摘PU dispersion was chosen as an impregnating agent to produce leather-like sheet on spun-laced nonwoven.Three typical coagulating processes were studied.It was found that the best coagulating process for the chosen PUdispersion to get the leather-like sheet was coagulation in a sodium chloride solution.The detailed study of coagu-lating processes in sodium chloride solution was carriedout and optimal condition was obtained.Some experi-mental results were elucidated.Keywords:PU dispersion,coagulating, impregnating,ar-tificial leather,spun-laced nonwoven.
文摘以自制的纳米锑掺杂氧化锡(ATO)粉体以及Bayhydrol XP 2593水性聚氨酯(PU)分散体为原料,将KH-550表面改性后的纳米ATO-丁二醇浆料、水性PU与助剂等共混复配,制得分散稳定的水性纳米ATO/聚氨酯复合涂料。在玻璃上进行ATO/PU复合涂料的应用实验,结果表明:涂膜铅笔硬度可达H、划格附着力可达1级。紫外-可见-近红外光谱分析表明:制得的ATO/PU复合涂料涂膜玻璃的可见光透过率可达83.24%,红外阻隔率达到约70%;经该ATO/PU复合涂膜处理的绝热室能降温达6℃。
基金financially supported by the NSF of China(No.41502345)
文摘In this study, laponite was tested as a mud-making material for drilling fluids. Laponite is a synthetic smectite clay with a structure and composition closely resembling the natural clay mineral hectorite. Commercially available laponite was characterized by X-ray di ractometry, scanning electron microscopy and infrared spectrometry. Its dispersibility, salt resistance and high-temperature resistance were evaluated. The results showed that laponite possessed superior cation exchange capacity(140.4 mmol/100 g) with interlayer cations of Na^+ and Li^+. Laponite could easily be dispersed in water to yield increased viscosity with no influence from hydration time or temperature. On the other hand, laponite dispersions displayed an excellent heat resistance, with invariant apparent viscosity at high temperatures. For instance, the apparent viscosity of the2 wt% laponite dispersion underwent changes between 22 and 24 mPa s after hot rolling at 180–240 °C for 16 h. Compared to existing mud-making materials, laponite exhibited better mud-making properties. Furthermore, laponite revealed good compatibility with other additives, and the water-based drilling fluids prepared with laponite as mud-making material showed an excellent stability at elevated temperatures and superior performance–cost ratios. Overall, these findings indicated that laponite had an excellent dispersibility at high temperatures and hence would have promising applications as high-temperature mud-making material for preparing water-based drilling fluids designed for ultra-high-temperature environments.
