水性树脂的制备及对油井水泥防腐性能的提升

以苯乙烯磺酸钠、环氧树脂E54为原料，制备了一种用于提高油井水泥石抗CO₂腐蚀的水性环氧树脂WEP。通过FTIR、¹HNMR及TG分析了其化学结构和热稳定性。将制备的WEP分散到水中形成乳液，测试了乳液的分散性与稳定性。将WEP用于油井水泥石中，在模拟地层高温高压及CO₂酸性环境条件下进行了水泥石腐蚀实验，通过抗压强度、热重分析、SEM以及XRD评价了水泥石的腐蚀程度。结果表明，WEP具有较好的环境应用热稳定性，其热分解温度为295℃。WEP具有良好的自乳化性能，乳液分散均匀，乳液滴粒径较小，且乳液稳定性高，在6000r/min离心分离条件下可稳定30min不分层。WEP可有效提高水泥石抗CO₂腐蚀性能，水泥石在180℃、总压40 MPa、CO₂分压10 MPa条件下，腐蚀90 d后，含WEP的改性水泥石抗压强度衰退率仅为14.7%,CaCO₃质量分数仅为0.25%，均远低于对比水泥石。XRD和SEM结果表明，WEP改性的水泥石腐蚀后，其内部主要成分仍是水...     

A Universal Strategy of Perovskite Ink - Substrate Interaction to Overcome the Poor Wettability of a Self-Assembled Monolayer for Reproducible Perovskite Solar Cells

Perovskite solar cells employing [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) self-assembled monolayer as the hole transport layer have been reported to demonstrate a high device efficiency. However, the poor perovskite wetting on Me-4PACz caused by poor perovskite ink interaction with the underlying Me-4PACz presents significant challenges for fabricating efficient perovskite devices. A triple co-solvent system comprising dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and N-methyl-2-pyrrolidone (NMP) is employed to improve the perovskite ink - Me-4PACz coated substrate interaction and obtain a uniform perovskite layer. In comparison to DMF- and DMSO-based inks, the inclusion of NMP shows considerably higher binding energies of the perovskite ink with Me-4PACz as revealed by density-functional theory calculations. With the optimized triple co-solvent ratio, the perovskite devices deliver high power conversion efficiencies of >20%, 19.5%, and ≈18.5% for active areas of 0.16, 0.72, and 1.08 cm², respectively. Importantly, this perovskite ink–substrate interaction approach is universal and helps in obtaining a uniform layer and high photovoltaic device performance for other perovskite compositions such as MAPbI₃, FA_1−xMA_xPbI_3–yBr_y, and MA-free FA_1−xCs_xPbI_3–yBr_y.     

颜基比对水性凹印油墨分散性的影响

在颜料含量不变的前提下,通过改变颜料与树脂的比例(即颜基比)来配制4色水性凹印油墨基墨,测试所配制基墨的分散性和粘度,研究颜基比对油墨分散性的影响.研究结果表明:颜基比对油墨的分散性具有较大的影响;不同种类颜料配制油墨的最佳颜基比是不同的;油墨的分散性对油墨的粘度有一定的影响,油墨的分散性不好,粘度较大.     

高品质BiOCl珠光颜料的制备及其在水性珠光印花涂料中的应用

为解决合成高固含量氯氧化铋(BiOCl)晶体时易产生晶体碎片和团聚的问题，以聚乙二醇单甲醚-b-聚甲基丙烯酸N,N-二甲基氨基乙酯为分散剂，制备了高固含量(10%)、分散性优异的正方形Bi OCl晶体。以其为珠光颜料，自制的水性聚氨酯(WPU)乳液作黏合剂，制得了具有不同层次珠光效果的织物珠光印花涂层。用光学显微镜、激光粒度仪和XRD考察了BiOCl晶体的形貌、粒径分布和结晶度，并考察了珠光印花涂层的透气性、透湿性、水接触角及色牢度。结果表明，Bi OCl晶体的尺寸可控、无碎片和团聚、结晶度较高；珠光印花涂层透湿率>5500 g/(m²·d)，透气率在15～24 mm/s之间，水接触角>130°，耐洗和耐摩擦色牢度达到4级及以上。     

聚胺水基钻井液特性实验评价

室内合成的聚胺强水化抑制剂SD-A可有效抑制黏土水化分散,与国外同类产品Ultrahib性能相当。聚胺水基钻井液配方为:4%膨润土浆+3%SD-A+0.5%SD-E+1%PAC-LV+0.3%XC+3%SD-506。与聚合醇、阳离子、KCl/聚合物钻井液相比,二级膨润土在聚胺水基钻井液中的膨胀率最小,岩屑回收率最高,表明聚胺水基钻井液抑制页岩水化分散能力强。聚胺水基钻井液120℃热滚16 h前后的流变性能稳定,热滚后动塑比为1.07,高于油基钻井液。在400 mL聚胺水基钻井液中分别加入144 g NaCl、8 g CaCl2和80 g劣土后,体系流变性发生不同程度的改变,而滤失量变化较小,其中CaCl2对体系流变性影响最大。结果表明聚胺水基钻井液的抗污染能力较强。屈曲硬度实验、耐崩散实验和黏结实验等新型实验方法表明,聚胺水基钻井液的抑制性接近甚至超过油基钻井液,清洁润滑性优良,其EC值为12 g/L,符合环保要求。另外,简要分析了聚胺水基钻井液的抑制机理。     

Effects of inorganic fillers on the performance of the water-based intumescent fire-retardant coating

The purpose of this research was to evaluate the influences of filler type and its content on the performance of a water-based intumescent fire-retardant coating. Three fillers (vermiculite, celite, and aluminum hydroxide) were added to the intumescent paint formulation. The thermal and fire protective properties were studied with thermogravimetric analysis (TGA), torch test, electrical furnace, scanning electron microscopy (SEM), and Fourier transform infrared analysis (FTIR). The results showed that adding fillers into coatings up to 3% could improve the intumescent coating's behavior and increase its endurance against flames. Of the three fillers used, vermiculite showed a better performance in the torch test, attributed to its chemical and physical structure. Vermiculite has low thermal conductivity and is considered an appropriate filler for heat-insulation. The final back-plate temperatures in the torch test for the vermiculite-containing samples were around 100°C–150°C lower than that of other samples. Moreover, vermiculite's addition improved the coating's expansion by 10% compared with the control sample's. The vermiculite sample's char layer morphology showed a uniform cell size distribution, indicating structural robustness. The coating samples successfully transformed polypropylene flammability from highly flammable to V0 level in the UL 94 vertical burning test standard. The results showed that vermiculite could improve intumescent paint's fire resistance and be used as an enhancer in intumescent coating formulations.     

Low-Temperature Plasma Sintering of Inkjet-Printed Metal Salt Decomposition Inks on Flexible Substrates

Due to their complex formulation, conductive nanoparticle inks for inkjet printing are limited in terms of the types of metals and substrates that can be utilized. A new and simplified class of inks called metal salt decomposition (MSD) inks has the potential to introduce a multitude of metals, which can be printed directly onto a wide range of substrates. Here, the use of atmospheric oxygen plasma to develop polycrystalline Au and Pt films at processing temperatures near room temperature (≈33 °C) with excellent conductivities up to 10⁵ S m⁻¹ is demonstrated. The conformal nature of the ink allows metal films to be printed onto a broad range of temperature-sensitive substrates including polymers, papers, and fabric. The Au ink is then used to build a simple light-emitting diode circuit showing its flexibility, durability, and long-term stability as deposited thin metal films. Additionally, such inks cost less than one-third the price of similar nanoparticle inks highlighting their overall affordability and good stability.     

蓖麻油基双重交联防腐蚀水性聚氨酯的制备及性能

以异佛尔酮二异氰酸酯（IPDI）、聚碳酸酯二醇-1000(PCDL-1000)、蓖麻油（CO）、季戊四醇三丙烯酸酯（PETA）为主要原料，使用丙酮法制备了一系列双重交联的CO基水性聚氨酯（CWPU）乳液。采用FTIR、紫外-可见分光光度计、铅笔硬度计、电子万能实验机、SEM、电化学工作站对CWPU薄膜进行了表征，测试了CWPU薄膜的拉伸性能、耐水性、耐磨性及耐腐蚀性，探讨了其耐腐蚀机理。结果表明，当CO含量（以乳液溶质总质量计，下同）为4%时，制备的薄膜CWPU的24 h吸水率仅为4.5%，对Q235钢板基底的附着力为0级，对Q235钢板基底的保护效率可达99.05%，表明所制CWPU薄膜具有优异的耐水、防腐蚀性能。