Behaviour of 54.4SiO2-13.7Na2O-1.7K2O-5.0CaO-12.4MgO-0.6Y2O3-11.3Al2O3-0.9B2O3 HT-SOFC glass sealant under oxidising and reducing atmospheres

The behaviour of the promising glass sealant 54.4SiO₂-13.7Na₂O-1.7K₂O-5.0CaO-12.4MgO-0.6Y₂O₃-11.3Al₂O₃-0.9B₂O₃ for solid oxide fuel cells (SOFCs) under SOFC operating conditions was studied. First, the kinetics of the crystallisation processes at the operating temperature (850 °C) was discussed (maximum exposure time of 1000 h), and the effect of crystallisation on the coefficient of thermal expansion (CTE) of the sealant was studied. Furthermore, the degradation processes at the interface of the glass sealant and functional SOFC materials (Crofer 22 APU, YSZ, and NiO(Ni)-YSZ) during exposure to 850 °C in oxidising and reducing atmospheres for 500 h were studied. The tests demonstrated good performance of the sealant studied and possibility of its application in SOFCs.     

用于PU家俱漆中快干型醇酸树脂的研制

通过介绍快干型醇酸树脂的生产工艺和技术指标,把它同台湾生产的ＥＴＥＲＫＹＤ３１０６－Ｘ－７０醇酸树脂在干燥性能方面进行了对比,并探讨了影响其干燥性能的因素。     

户外木质窗水性清漆的配方设计与应用

介绍了一种采用核-壳结构丙烯酸树脂为主要成膜物质的户外木质窗专用水性清漆,并从树脂选择、成膜助剂的选择、流平润湿剂、消泡剂和流变控制剂的选择以及生产过程控制讨论了对产品性能的影响,并简单介绍了该产品的应用领域和产品特点。     

湿度对水性双组分木器涂料的影响

通过测试并描述环保型水性双组分聚氨酯涂料成膜机理及成膜过程的表面状况,介绍了在不同环境湿度下,水性双组分木器清漆所表现出来的各方面性能及表观的变化,从而阐述了湿度对水性双组分聚氨酯木器涂料施工及涂膜性能的重要性。     

Hydrophilic UV-curable PU resins for PET micro-fiber applications

Hydrophilic UV-curable PU oligomers (UV-PU) were prepared by mixing either the toluene diisocyanates (TDI) with polyethylene glycol-1000, or the isophorone diisocyanate (IPDI) with polypropylene glycol-1000 and dimethylol propanic acid (DMPA), to produce the desired carboxylic acid bearing or non-ionic PU oligmer (NCO-PU), separately. The 2-hydroxyethyl methacrylate (HEMA) was then added into the NCO-PU oligomer to form acrylate-terminated (UV-curable) PU oligomer (UV-PU). The reactive diluents, such as 1,6-hexanediol diacrylate (HDDA), trimethylolpropane tricarylate (TMPTA) and others were used to adjust the viscosity of UV-PU and to control the concentration of acrylic group. The hydrophilic UV-curable PU system was formulated and applied on PET micro-fiber and then cured by an UV-radiation at ambient temperature. The physical, thermal, and mechanical properties, in particular, the hydrophilic properties of UV-curable PU treated PET micro-fibers will be discussed.     

Preparation and characterization of blend membranes of polyurethane and superfine chitosan powder

A novel kind of asymmetric blend membranes with superfine chitosan powder (SCP) and biomedical polyurethane was prepared by immersion precipitation phase inversion method. Effects of different SCP content on the morphology and properties of the blend membranes were investigated. The result showed that SCP content had little influence on the cross-section structure of the blend membranes, and the cross-section presented a cellular structure. WAXD results revealed that the aggregated structure of SCP remained. With an increment of SCP content, the pore diameter and porosities of blend membranes increased firstly, and then decreased. While, the water absorption rate and water vapor transmission rate were improved remarkably with increasing SCP content. The mechanical testing results indicated that with an increment of SCP ratio, mechanical properties presented a descending trend, whereas all blend membranes exhibited the good elasticity.     

正交实验优选HTBN/聚氨酯合成的最佳工艺条件

以端羟基聚丁二烯-丙烯腈(HTBN)为软段、甲苯二异氰酸酯(TDI)为硬段和端氨基硅油为改性剂,合成了端氨基硅油改性HTBN型聚氨酯(PU)。以n(-NCO)∶n(HTBN)、n(硅油)∶n(HTBN)、n(扩链剂)∶n(HTBN)和硅油加入方式为主要影响因素,并以断裂伸长率、邵氏硬度、拉伸强度和定伸应力为考核指标,采用L9(34)正交实验方法优选该PU合成的最佳工艺条件。研究结果表明,当n(-NCO)∶n(HTBN)=1.6∶1、n(硅油)∶n(HTBN)=6∶100、n(扩链剂)∶n(HTBN)=5∶100且在后期加入端氨基硅油时,端氨基硅油改性HTBN型PU的综合性能最好。     

高羟基含氟丙烯酸乳液的合成及性能研究

以丙烯酸酯类单体作为原料,以过硫酸钾为引发剂,采用预乳化半连续乳液聚合方式合成了高羟基丙烯酸乳液,并在后期补加氧化还原体系引发剂,提高了单体的转化速率。系统地研究了乳化剂用量、羟基单体、氟单体、硅单体含量等因素对涂膜性能的影响。最后,将制备的丙烯酸羟基组分同水性固化剂配制成双组分水性丙烯酸聚氨酯清漆,并分析清漆的性能。     

环氧密封胶泥的研制与应用

介绍了一种黏度低、室温固化、不开裂、韧性好的密封胶泥。并对环氧树脂、增韧剂、固化剂等原料对环氧密封胶泥性能的影响进行了研究。     

缩合脱氢有机硅密封剂耐密闭状态热降解研究

以含氯硅油和正硅酸乙酯为硫化剂、有机锡为催化剂,对比了缩合脱氢和脱醇型有机硅密封剂耐密闭状态热降解性能,提出了缩合脱氯型有机硅密封剂的硫化和耐密闭状态热降解的机理。实验结果表明,缩合脱氢型有机硅密封剂在250℃和300℃的高温环境下,具有良好的耐降解性能;在高温老化的初期,密封剂由于体系中的小分子氢和水等的存在,硬度下降,当老化时间超过100h后,密封剂的硬度保持不变;同时缩合脱氢型有机硅密封剂具有良好的耐热空气老化性能。