电聚合制备三聚氰胺分子印迹QCM传感器薄膜及其表征研究

通过研究得出,在聚合电压U为0~1.6V、聚合段数为22、模板三聚氰胺(MEL)浓度为4mmol/L、单体甲基丙烯酸(MAA)浓度为10mmol/L、成膜剂邻苯二胺(o-PD)浓度为18mmol/L条件下,以pH 8.0的BR缓冲液作为溶剂和电解液,用电聚合方法,直接在石英晶体微天平(QCM)传感器电极上修饰的分子印迹薄膜,其对目标分子MEL具有良好的频率表征效果,频移值为59Hz.通过相同3个修饰电极的频率表征变化来看,电极对目标分子的识别表征极不稳定.这与手动进样方式、环境较大噪声和电极本身差异密切相关,难以建立对目标分子的标准曲线(r=0.966)实现准确定量分析.     

环保型醚化蜜胺树脂的制备

以三聚氰胺、多聚甲醛、甲醇等为原料,制备环保型醚化蜜胺树脂,确定了最佳工艺条件：三聚氰胺与甲醛物质的量比为1：3．5,三聚氰胺与甲醇物质的量比为1：（5—6）,羟甲基化、醚化和缩聚反应温度分别为85,50,80oC,羟甲基化、醚化和缩聚反应体系pH分别为8．0～9．0,3．5。4．5,6．5—7．0,乌洛托品用量为2．0％。此条件下制备的醚化蜜胺树脂性能稳定。     

Preparation and properties of a silver particle-coated and 1-dodecanethiol-modified superhydrophobic melamine sponge for oil/water separation

A Ag particle-coated and 1-dodecanethiol-modified melamine sponge (Ag-DDT-MS) was prepared through surface roughness by coating silver particles and subsequent grafting of a hydrophobic long hydrocarbon chain. Superhydrophobic and 3D porous Ag-DDT-MS was characterized by Fourier transform infrared spectroscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The water contact angle of Ag-DDT-MS reached 159.2°. Ag-DDT-MS exhibited excellent absorption capacity for high viscous oils and organic solvents, ranging from 42.8 to 105.2 g∙g⁻¹. The absorbed oils can be easily collected by the mechanical pressing process, and the oil recovery rate was satisfactory, more than 90% after 20 recycles. Ag-DDT-MS material also demonstrated good stability and excellent compression-recovery ability, keeping 88.6% of the initial height after ten compression-release cycles.     

密胺树脂强化“脱硫石膏-玻纤”的成型过程与机制

为了资源化利用烟气脱硫产生的工业废弃物脱硫石膏,以密胺树脂强化的脱硫石膏-纤维复合体系为研究对象,将密胺树脂固化成型条件与石膏的水化成型过程进行匹配与优化,发展出具有优异综合性能的石膏复合板材.结果表明:密胺树脂的固化交联与石膏晶须生长过程的合理匹配与协同,既有助于形成有机-无机紧密结合,同时也有助于加强脱硫石膏晶须与玻璃纤维之间的附着,促进实现密胺树脂对材料性能的强化;石膏复合板的抗折强度不低于18 MPa,抗压强度大于25 MPa,弹性模量大于6500 MPa,24 h吸水率低于3.0%,主要性能超过传统的水泥或硅酸钙类型的基础板材,具有明显的技术及市场开发前景.     

In situ synthesized and dispersed melamine polyphosphate flame retardant epoxy resin composites

The dispersion of flame retardants in polymer matrix has significant impact on the final properties of the final materials. Homogenous dispersion for additive type flame retardant powder in polymer melt or solution with high viscosity is a challenge all the time. In the present research, melamine polyphosphate (MPP) is employed to flame-retard the epoxy resin (EP). Different from direct addition of MPP powder in viscous EP glue like conventional means, MPP is firstly synthesized by melamine and polyphosphoric acid in a good solvent for EP. Keeping fine and even dispersion of the produced MPP particles, EP prepolymer is added into the MPP containing solution. By this way, perfect dispersion of the flame retardant can be achieved both in the glue and the cured resin. A series of tests such as the particle size analysis, flammability evaluation, and mechanical properties tests are conducted to compare the MPP flame retardant EP obtained by this method and the conventional one. It shows that the in situ synthesis and compounding method can endow the MPP incorporated EP glue system with better homogeneity and stability, hence leading to higher flame retardancy and obviously improved mechanical performance of the final composite. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47194.     

磷酸三聚氰胺复盐结晶法净化湿法磷酸技术进展

本文讨论了结晶法净化湿法磷酸方法，对复盐结晶法净化湿法磷酸生产磷酸盐，多聚磷酸盐的生产方法，工艺流程，工艺特点，产品质量进行了研究。     

镁离子改性MPP对玻璃纤维增强聚酰胺66的阻燃研究

研究了三聚氰胺聚磷酸盐（MPP）和镁离子改性三聚氰胺聚磷酸盐（Mg-MPP）分别对玻璃纤维增强聚酰胺66（PA66）的阻燃效果、热降解行为以及力学性能的影响。结果表明，在相同添加量的情况下，添加Mg-MPP比添加加PP有着更高的阻燃效率，氧指数提高了近16％。同时还提高了材料的热稳定性，起始分解温度提高26．5℃，残炭量增加。此外，Mg—MPP阻燃玻璃纤维增强PA66的力学性能明显优于MPP阻燃玻璃纤维增强PA66，其拉伸强度、弯曲强度和悬臂梁缺口冲击强度分别比后者提高了11．8％、6．5％和18．5％。     

阻燃树脂的研制

研究用于木材和印刷线路板防火的阻燃树脂,用三溴苯酚改性醛酚树脂,三聚氰胺改性酚醛树脂及松香改性树脂,将三者按一定的比例混合形成具有良好物理性能的阻燃树脂,同时也讨论了树脂各组分之间比例及其对混合树脂性能的影响。     

三聚氰胺在精细磷酸盐生产中的变化及再生

研究了湿法磷酸生产精细磷酸盐过程中反应媒三聚氰胺的变化及再生过程中洗涤液浓度、温度的一次作用、二次作用及其交互作用对杂质洗涤效率的影响,并得出了最佳工艺条件。     

三聚氰胺-阴离子表面活性剂缔合物微粒体系的共振散射光谱研究及分析应用

在醋酸盐缓冲溶液中,三聚氰胺(MA)分别与阴离子表面活性剂(AS)十二烷基硫酸钠(SDS)、十二烷基苯基磺酸钠(SDBS)和十二烷基磺酸钠(SLS)形成SDS-MA,SDBS-MA和SLS-MA缔合物微粒,该缔合物微粒均在472nm处有一个较强的共振散射峰。三聚氰胺质量浓度在0.33～23.3,1.0～23.3和1.1～23.3mg/L范围内分别与各体系在472nm处的共振散射光强度呈线性关系,其检出限分别为10,32和33μg/L MA。将十二烷基硫酸钠(SDS)体系用于合成废水测定,结果满意。