2-(2-氨基-4-噻唑基)-2-[[(Z)-(叔丁氧基羰基)-甲氧基]亚氨基]乙酸2-苯并噻唑硫酯的合成

由(Z)-2-氨基-α-[[(2)-(叔丁氧基)-氧代乙氧基]亚氨基]-4-噻唑乙酸(简称ADTAC)和2,2′-二硫联二苯并噻唑(DM)合成了2-(2-氨基-4-噻唑基)-2-[[(Z)-(叔丁氧基羰基)-甲氧基]亚氨基]乙酸2-苯并噻唑硫酯,其合成的较佳条件是:n(ADTAC)∶n(DM)∶n(N-甲基吗啉)∶n(亚磷酸三乙酯)=1.0∶2.0∶1.4∶2.4,反应温度0~15℃,亚磷酸三乙酯滴加时间为2~4 h,保温时间约为1 h。在此条件下,产品产率约70%,产品中标题产物的质量分数约100%(相对于标样),熔点140~142℃。     

Effects of Silane Coupling Agent on Microstructure and Mechanical Properties of EPDM/Carbonyl Iron Microwave Absorbing Patch

The effects of types and amounts of silane coupling agent on mechanical properties of vuleanized rubber microwave absorbing patch （VRMAP） were studied. The mechanisms of silane coupling agent＇s effects on mechanical properties of rubber microwave absorbing patch （ RMAP ） and microvave absorbing patch＇s （MAP＇s） mierostrueture were also discussed by using SEM and FT-IR. The experimental results show that the tensile strength of RMAP could be increased through adding the filler of carbonyl iron powder （CIP） modified by silane coupling agent. RMAP fiUed with CIP, which was treated by silane coupling agent KH550, possessed a high tensile strength of 11.5 MPa, which was 448% more than that of MAP whose filler wus not modified by any coupling agent. It was found that the optimal amount of KH550 was 1.0 phr to 100.0 phr carbonyl iron powder. The effects of different modifying techniques on RMAP＇s mechanical properties were also inrestigated. It is indieated that MAP whose filler is modified by the wet process has the highest tensile strength, but it is not the optimal modiifying technique due to complieated wet process. On the contrary, the dry process was very simple, and VRMAP possessed fairly high mechanical properties, therefore, it was the perfect modifying process.     

α-羟基-1,3-二羰基-2-异吲哚丁酸的合成

对医药中间体α－羟基－１,３－二羰基－２－异吲哚丁酸的合成进行了探讨。以邻苯二甲酸酐、尿素、丙烯醛、氯仿为主要原料,经过四步反应合成了目的化合物     

片状镀银铜粉的制备及性能研究

采用三种制备方法制备片状镀银铜粉,并对其性能进行比较,结果表明：（1）不同制备方法银在片状铜粉上的表面形貌不同,采用化学镀银后再球磨,能得到导电性好的片状镀银铜粉;（2）无水乙醇洗涤,室温真空干燥的片状镀银铜粉,其比重,松比及导电性能较好;（3）离子水洗涤,真空干燥温度为40℃时,得到导电性较好的片状镀银铜粉。     

H814-902/不饱和聚酯树脂/淤泥体系收缩研究

在淤泥填充不饱和聚酯树脂的新体系中加入低收缩添加剂H814-902控制固化收缩。通过体积收缩率计算,研究不饱和聚酯树脂/淤泥体系、不饱和聚酯树脂/淤泥/低收缩添加剂体系收缩性能和抗弯强度。研究结果表明:当低收缩添加剂、不饱和聚酯树脂、淤泥之间的质量比为18∶100∶100时,其体系收缩率达到将其用于低收缩片状模塑料的要求;当玻璃纤维的质量分数为30%时,其抗弯强度达到低收缩片状模塑料强度100 MPa的要求。研究中首次尝试采用高分辨魔角旋转核磁共振(HR/MAS-NMR)方法,并结合SEM方法分析不饱和聚酯树脂/淤泥/低收缩添加剂体系抗收缩机理,提出该体系中空穴、两相岛屿状结构以及固化反应中交联度的下降是抑制体系收缩的主要原因。     

化学沉淀-局部规整法制备棒状及片状BaFe12O19

以针状-γFeOOH为原料,采用化学沉淀-局部规整法制得棒状及片状BaFe12O19。通过控制搅拌速率调变γ-FeOOH的长径比和结晶有序程度,得到结晶有序程度较低但长径比为8～10和结晶有序程度较高但长径比为2～5的棒状BaFe12O19。受形成历程影响,900℃焙烧条件下所得BaFe12O19中含有少量α-Fe2O3和BaFe2O4杂相。前驱体加入少量NaCl,由于其起到提高γ-Fe2O3相变温度和助熔剂的双重作用,前驱体900℃焙烧物为纯相且结晶有序程度较高的BaFe12O19,且颗粒呈明显的二维近六角片状.     

Catalytic hydrolysis of carbonyl sulfide over modified coal-based activated carbons by loading metal

A novel type of metal oxide/activated carbon catalyst was prepared by sol-gel method for the hydrolysis of carbonyl sulfide (COS). The influences of the calcination temperature, additive content (2.5%–10.0% Fe₂O₃, mass fraction) and the basic density of the activation process were thoroughly investigated. The surface of catalysts was characterized by Boehm titration. The products were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that catalysts with 2.5%–5.0% Fe₂O₃ after calcining at 500 °C have superior activity. The conversion rate of COS increases with increasing the relative density of basic capacity loaded onto activated carbon(AC), and the activity follows the order: KOH>Na₂CO₃>NaHCO₃. Boehm titration data clearly show that the total acidity increases (from 0.06 to 0.48 mmol/g) and the basic groups decrease (from 0.78 to 0.56 mmol/g) after COS hydrolysis and H₂S adsorption. The XPS results show that the product of H₂S may be absorbed by the interaction with metal compounds and O₂ to form sulfate (171.28 eV) and element sulfur (164.44 eV), which lead to catalysts poisoning.     

预处理过程中减少车身灰粒的对策

简述了危害车身涂装质量的灰粒形态,以及预处理过程中减少和清除灰粒的措施。     

甲醇合成催化剂保护剂的作用

甲醇合成原料气中,有羰基铁、羰基镍等杂质,能引起甲醇催化剂的快速失活。还能引起许多副反应,使粗甲醇中杂质含量增加,增加了甲醇精制的难度,影响了产品质量。且羰基铁存在于甲醇中显红色难以除去,也影响精甲醇的外观质量。齐鲁石化公司研究院开发的QXJ和QMG系列甲醇催化剂保护剂,可以有效地达到脱除原料气中的羰基铁、羰基镍、能延长催化剂使用寿命、减少副反应,提高产品质量。     

胸腺素α1的Fmoc固相合成法

本文用Fmoc固相方法合成了胸腺素α1。采用对碱敏感的Fmoc作为α -氨基的保护基 ,并确定与之配套的侧链保护策略。探索出了适宜的接肽方案 ,即前 9步接肽用对称酸酐法 ,后 1 8步用DCC -HOBt缩合法 ,从而保证了每步的高缩合率。试验结果表明各步的缩合率均在 96 2 %以上 ,多数达 99%以上。同时还对合成工艺条件进行了研究。合成粗品的纯度 (胸腺素α1的含量 )为 46 52 % (质量分数 ) ,胸腺素收率为 37 81 %