无溶剂环氧重防腐涂料的制备及性能测试

制备了一种无溶剂环氧重防腐涂料并进行了性能检测,分别讨论了环氧树脂、稀释剂、助剂、填料和固化剂对漆膜性能的影响。试验表明,添加环氧树脂量的20%的稀释剂2020对漆膜的防腐性能无不良影响,加入5%的湿法绢云母粉可以显著提高漆膜的抗介质渗透能力。     

功能化Bronsted-Lewis酸性离子液体催化合成1-氨基烷基-2-萘酚

本文合成了Bronsted-Lewis酸性咪唑离子液体[CH2COOHmim]FeCl3Br,并研究了该离子液体作为催化剂,将2-萘酚、芳香醛、酰胺三组分在无溶剂条件下于100 ℃合成一系列的1-氨基烷基-2-萘酚。产物用IR、1HNMR、13CNMR对其结构进行确认。实验结果表明该方法环境友好,操作简单,产率较高,催化剂离子液体可多次循环使用。     

无溶剂环氧煤焦沥青涂层在土壤中的电化学行为

目的研究无溶剂环氧煤焦沥青涂层在饱和水含量土壤中的电化学行为。方法将无溶剂环氧煤焦沥青涂层涂覆在Q235碳钢上,测试不同厚度和不同埋设时间涂层的开路电位和交流阻抗谱图,探索涂层厚度和埋设时间对涂层电化学行为的影响。利用SEM分析基体表面腐蚀产物的元素组成,探索侵蚀性物质是否到达基体表面参与腐蚀历程。结果涂覆200μm厚涂层的Q235碳钢的稳定开路电位约为-0.37 V,与裸Q235钢相比,自腐蚀电位正移了0.28 V。随着涂层厚度的增加,开路电位呈上升趋势,容抗弧半径增大,涂层对侵蚀性溶液的屏蔽阻挡能力提高。随着在土壤中埋设时间的延长,容抗弧半径减小,吸水率增大,涂层的防护性能有所下降,但低频阻抗模值仍高达8.8×107Ω·cm2。能谱分析显示,Q235碳钢表面未出现Cl-等侵蚀性物质。结论无溶剂环氧煤焦沥青涂层在土壤环境中是有效的屏蔽层,可对Q235碳钢基体起到有效的防护作用。     

Laminated Polymer-Encapsulated Halide Perovskite Photoconductors

Herein, a simple, solvent-free method to fabricate polymer-encapsulated halide perovskite photoconductors is described. Dry mechanochemical synthesis is used to prepare CsPbBr₃ in the presence of poly(butyl methacrylate) (PBMA). The resulting composite powder is then heated and pressed into a free-standing disk with a thickness controlled by a metallic spacer ring. The disk can be laminated on a glass substrate patterned with interdigitated electrodes, resulting in a planar photoconductor device. The best photoconductive performance is obtained for disks that consist of 75 wt.% CsPbBr₃ in PBMA, reaching a detectivity of ≈2 × 10¹¹ Jones. Moreover, by adjusting the thickness of the disk, narrowband detectors can be obtained due to charge collection narrowing. Depending on the thickness of the pressed disk, the position and width of the detectivity peak can be tuned. At last, the disks are tested as possible absorber materials for X-ray detectors, where ow detection limit, and fast and linear response are measured for perovskite-polymer disks with 50 wt.% perovskite content. This work shows a simple and versatile approach toward the fabrication of halide perovskite photodetectors, which can be carried out in air and without the use of solvents.     

Solvent-Free One-Pot Synthesis of 1,8-Dioxo-Decahydroacridines by a [Et3NH][HSO4] Catalyzed Multicomponent Reaction

ABSTRACT

[Et₃NH][HSO₄] has been used as an effective catalyst for one-pot, three-component condensation of an aromatic aldehyde, 5,5-dimethyl-1,3-cyclohexanedione and ammonium acetate for the synthesis of 1,8-dioxo-decahydroacridines under solvent-free conditions. The present methodology offers several advantages, such as high yields, short reaction times, mild condition, and a recyclable catalyst with a very easy work-up.     

一种无溶剂饮水舱防腐涂料的毒性研究

目的 探讨一种无溶剂饮水舱防腐涂料的毒性作用.方法 急性经口毒性实验采用啮齿类动物急性固定剂量经口毒性实验一次限量法,剂量设为20000 mg/(kg BW).微核实验设5000、2500、1250 mg/(kg BW)3个剂量组、阴性对照组及阳性对照组,采用30 h给受试物法,检测骨髓嗜多染红细胞微核率.Ames实验...     

微波无溶剂法提取东紫苏精油的工艺研究及成分分析

采用微波无溶剂法提取东紫苏精油,考察工艺中料液比、浸泡时间、提取时间、微波功率对精油提取率的影响,在单因素试验的基础上通过正交试验对提取工艺进行优化并采用气相色谱-质谱(gas chromatography-mass spectrometry,GC-MS)技术鉴定东紫苏精油的化学成分。结果表明,微波无溶剂提取东紫苏精油的最佳工艺条件为:料液比1∶6(体积比),浸泡时间2 h,提取时间60 min,微波功率600 W,精油得率0.096 mL/50 g。采用GC-MS技术,从提取的精油中鉴定出43种化学成分,主要成分为乙酸松油酯,相对含量达到了56.25%,其次为丙酸香叶酯(6.8%)、棕榈酸(4.95%)、依朴酚醇(4.83%)、氧化石竹烯(4.41%)、乙酸(Z)-5-十二烯醇酯(3.28%)、α-松油醇(2.91%)、(S)-(+)-5-(1-羟基-1-甲基乙基)-2-甲基-环己烯-1酮(1.18%)、萜品醇(1.14%)、植酮(1.1%)。     

Green procedure for the preparation of scented alcohols from carbonyl compounds

Several alcohols--interesting as cosmetic fragrances whose main preparative route on an industrial scale or in the research laboratory is the reduction of the corresponding carbonyl compound--were obtained by a solvent-free methodology in a green chemistry context. The process involves the simple mixing of the carbonyl compound with sodium borohydride dispersed in wet alumina in the solid state; the conversions of the carbonyl compounds were obtained in good yields within short reaction times, without energy consumption. The following carbinols were studied: octan-3-ol, 2-cineolylols (endo-exo mixture), alpha-ionol, 4-methylbenzyl alcohol, 1-phenylethanol, trans-cinnamyl alcohol, p-anisyl alcohol, 4-phenyl-3-buten-2-ol.     

无溶剂玻璃鳞片重防腐涂料的研制

采用低分子环氧树脂、脂肪胺和多氨基酰胺固化体系,加入适量玻璃鳞片,利用玻璃鳞片优异的抗渗透性能,研制出高效长久无污染的防腐涂料。     

Sulfur-Bridged Bonds Heightened Na-Storage Properties in MnS Nanocubes Encapsulated by S-Doped Carbon Matrix Synthesized via Solvent-Free Tactics for High-Performance Hybrid Sodium Ion Capacitors

The exploitation of electrode materials with ability to balance capacity and kinetics between cathode and anode is a challenge for sodium-ion hybrid capacitors (SIHCs). Mn-based anode materials are limited by poor electrical conductivity, sluggish reaction kinetics, large volume variation, weak cycling stability, and inferior reversible capacity. Herein, MnS nanocubes encapsulated in S-doped porous carbon matrix (MSC) with strong sulfur-bridged bond interactions (C S Mn) are successfully synthesized by solvent-free tactics. The C S Mn bonds generated between MnS and carbon significantly inhibit the aggregation of nanostructural MnS cubes, restrict the volume expansion, and stabilize the nanostructure, which improves the Na⁺ storage reversibility and stability. Moreover, S-doped porous carbon enhances the electrical conductivity and electrons/ions diffusion rate, which boosts a fast kinetic reaction. As expected, MSC anode presents an outstanding reversible capacity of 600 mAh g^-1 at 0.2 A g^-1 and a long-term stable capacity of 357 mAh g^-1 for 1000 cycles at a high current density of 10 A g^-1 in sodium-ion batteries (SIBs). The as-assembled SIHCs deliver a high energy density of 109 W h kg^-1 and a high power output of 98 W kg^-1, with 88% capacity retention at 2 A g^-1 after 2000 cycles and practical applications (55 LEDs can be lighted for 10 min).