10％嘧菌酯水稻悬浮种衣剂制备

[目的]研制长效控释性防治稻瘟病的水稻种衣剂.[方法]通过对不同分散剂、成膜剂以及增稠剂的筛选,采用湿式超微粉碎加工工艺,获得一种新型水稻种衣剂成膜剂及种衣剂制备方法.[结果]10％嘧菌酯悬浮种衣剂的最佳制剂配方为嘧菌酯原药10％,YUS-FS3000 8％,黄原胶0.12％,快T0.5％,皂土0.5％,成膜剂8％.[结论]砂磨转速500 r/min、砂磨时间2h条件下,得到的种衣剂粒径小于3μm,其成膜性良好,脱落率小于5％,包衣后的水稻种子发芽率达到98.25％,符合水稻悬浮种衣剂要求.     

UV塑胶涂料常见问题及解决方案

本文对UV塑胶涂料在施工过程中的常见问题进行分析并提出相应的解决方案,重点研究漆膜表面常见瑕疵的2种解决方案,通过高固低粘体系和控制溶剂挥发速率能够有效改善漆膜表面常见瑕疵。     

十二烷基硫酸钠对天然矿物涂料稳定性的影响

本文报告了十二烷基硫酸钠在聚乙烯醇(PVA)天然矿物涂料中的稳定作用机制和最佳用量。实验表明:(1)十二烷基硫酸钠与PVA有强烈的相互作用,因而能加强新型建筑涂料的稳定性。(2)对固体份含量为40％的天然矿物涂料的粘度有明显的改变。(3)对该类涂料成膜后的其他性能有所改善。     

涂层剂MVF／S在新型磨花牛仔面料生产中的应用

本文介绍涂层剂MVF/S的性能及其在新型磨花牛仔服装面料生产中的应用。在涂层剂MVF/S中加入涂料,利用涂层和化学水洗方法生产新型磨花牛仔面料具有工艺简单、成本较低、污染少、花色品种齐全、服用性能及外观效果好等优点。     

电弧喷涂铝、锌涂层防腐研究

对金属热喷涂层(Al和Zn)的防腐性能进了行研究,重点讨论了电弧喷涂层(Al和Zn)的防腐性能。研究认为:电弧喷涂铝涂层与基体结合,强度明显优于气喷铝涂层,且涂层经封闭处理后,其防腐效果亦明显优于气喷涂层。     

Enhanced wettability and thermal stability of polypropylene separators by organic–inorganic coating layer for lithium‐ion batteries

Organic–inorganic coating polypropylene separators were developed by introducing SiO₂ nanoparticles through sol–gel process, where polydopamine was used as an intermediate layer. Scanning electron microscopy results showed the coating layers have highly porous structure, which was beneficial for liquid electrolyte uptake. Compared with pristine polypropylene separator, the ceramic separators showed improved thermal stability, higher ionic conductivity, and lower interfacial impedance. The cells employing the ceramic separators delivers excellent discharge capacity (retention = 75%) and coulombic efficiency up to 98% at 2 °C rate after 100 cycles. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46478.     

Magnetic particles for sugar separation from sulphuric acid solution generated during nano‐crystalline cellulose production

Nano‐crystalline cellulose (NCC) is a renewable material having different applications ranging from drug delivery to a reinforcing filling agent in polymer synthesis. Concentrated sulphuric acid is used to hydrolyze cellulosic biomass to obtain NCC. Manufacturers are keen to reuse the diluted acid solution left after the process. However, the presence of mono and oligosaccharides makes it unsuitable for repeated use. About 99 % of these compounds have been successfully separated from the acid solution by employing NaOH‐treated magnetic particles developed during this investigation. It has been observed that by NaOH treatment, zeta potential of the magnetic particles could be increased from +11 mV to +37.5 mV; correspondingly, sugar removal efficiency was increased from 23.04 % to more than 99 %. Thus a direct correlation between the change in zeta potential of the particles and sugar separation efficiency has been observed.     

Non‐isothermal crystallization kinetics of Al2O3‐YAG amorphous ceramic coating deposited via plasma spraying

Crystallization kinetics of the newly developed Al₂O₃‐Y₃Al₅O₁₂ (YAG) amorphous ceramic coating fabricated by atmospheric plasma spraying (APS) were investigated via differential scanning calorimetry (DSC) under non‐isothermal conditions. The phase compositions and microstructure of the as‐sprayed coating were characterized by X‐ray diffraction (XRD) and Scanning electron microscopy (SEM). The glass transition temperature T_g, the onset temperature of crystallization T_c and the peak temperature of crystallization T_p presented heating rate dependence. The related kinetic parameters of activation energies (E_g, E_c, E_p) and Avrami exponents (n) were quantified using various methods including Kissinger, Augis–Bennett, Ozawa and Matusita–Sakka, etc., to understand the phase transition mechanism and crystallization process in depth. A series of parameters including devitrification interval ΔT, thermal stability (T_c, E_c), nucleation resistance E_c/RT_g and fragility index F were quantified in order to evaluate the nucleation mechanism, crystallization behavior and thermal stability of Al₂O₃‐YAG amorphous ceramic coating. Excellent thermal stability was witnessed in the studied coating. Furthermore, the YAG crystalline phases can be reasonably controlled and independently precipitated from the amorphous matrix via proper annealing.     

Electrophoretic deposition of titanium nitride coatings

Electrophoretic deposition of the titanium nitride (TiN) coatings from suspensions prepared by dispersion of TiN particles in triethanolamine (TEA) containing butanol medium was studied. Effects of the TiN particles concentration (C_TiN) on the weight of the deposited coatings, triethanolamine concentration (C_TEA=0.25, 0.5, 0.75, and 1 mL/L) on the Zeta potential of the TiN particles, suspension electrical conductivity and pH, as well as effects of the deposition voltage (V_d=60, 90, and 120 V) and time (t_d =1, 2, and 3 minutes) on the microstructure and thickness of the deposited coatings were investigated. Variations in deposition current density, effective deposition voltage, electrical resistance, and deposited coating weight versus deposition time were recorded. The morphology of the as‐dried coatings was studied using Scanning Electron Microscope (SEM). The results indicated that by increasing the C_TiN the weight of deposits increases linearly up to 40 g/L. For suspensions containing C_TiN=40 g/L, the optimum C_TEA is obtained to be 0.5 mL/L leading to Zeta potential of 43.25 mV. Uniform and crack‐free as‐dried coatings obtained at V_d and t_d of 90 V and 2 minutes, respectively.     

生物3D打印蓖麻油基水性聚氨酯涂层固定化碳酸酐酶

以蓖麻油基阴离子水性聚氨酯为载体,采用生物3D打印技术制备含碳酸酐酶的生物活性聚氨酯涂层,并与传统涂覆法制备的含酶涂层进行对比。通过动态光散射、红外、扫描电镜-X射线能谱、热重、接触角等各种手段对涂层中酶与水性聚氨酯之间的相互作用进行了分析表征。结果表明,在形成生物活性涂层过程中,碳酸酐酶是通过与聚氨酯链段上阴离子基团的静电吸引被固定在聚氨酯涂层中。催化活性结果表明,与传统涂覆法相比,涂层的酶活回收率为50.51%,比传统涂覆法提高了4倍。这可能是由于生物3D打印技术制备的含酶涂层更薄、更均匀,表面更平滑。