聚氯化铝与聚氯化铁除磷效果的对比研究

以深圳某生活污水处理厂好氧出水为研究对象,对比了聚氯化铝(PAC)和聚氯化铁(PFC)的除磷效果。试验表明,PAC与PFC都具有良好的除磷效果;总磷去除率随着药剂投加量的增加而增加;当药剂投加量大于100 mg/L时,PFC对TP的去除率高于PAC,但PFC对出水pH的影响要大于PAC。     

有机凹凸棒土处理乳化液的实验研究

用制备的有机凹凸棒土处理乳化液。实验结果表明,有机凹凸棒土的投加量为0.3 g,超声60 min时,对COD为720 mg/L、浊度为485 NTU的乳化液处理效果最佳,其COD和浊度的去除率分别可达91.5%、99.5%,均显著高于天然凹凸棒土。     

痤疮发病机制与中医药内外治疗的研究进展

文章通过检索中国知网、万方等数据库,选取近年来公开发表的关于痤疮发病机制、中医药内外治疗痤疮方面的文献,以及近些年公开的专利研究进行系统、综合的概述。     

酸洗废液制备聚合氯化铁形态及稳定性研究

以钢铁盐酸酸洗废液为原料,催化氧化制备聚合氯化铁(PFC)。考察了聚合氯化铁稳定性的影响因素,并采用Ferron逐时络合比色法考察了制备温度、HCl/Fe的质量比、P/Fe的摩尔比、熟化时间对聚合氯化铁中铁形态分布及转化规律的影响。研究结果表明:在制备温度为60℃、HCl/Fe≥0.45,P/Fe≥0.12时,催化氧化制备的聚合氯化铁能稳定存在6个月以上,不发生水解。催化氧化制备的PFC中铁主要以Fe(a)和Fe(c)的形式存在,Fe(b)含量很少,随着熟化时间的延长,Fe(b)在14天左右完全消失。随HCl/Fe的质量比及P/Fe的摩尔比的增大,Fe(a)、Fe(b)含量先增加后降低,Fe(c)含量先减少后增加。     

汽车座椅用软质聚氨酯泡沫的进展

从汽车座椅的静态舒适性、动态舒适性及环保性方面入手,以多元醇为主线,介绍了汽车座椅用聚氨酯泡沫的发展历程及发展趋势。     

阻燃软质PVC的性能研究

系统研究了无机阻燃剂(氢氧化铝、硼酸锌、三氧化二锑)对软质聚氯乙烯(PVC)阻燃性能的影响。首先研究了氢氧化铝、三氧化二锑单独使用对软质PVC阻燃性能的影响,研究发现氢氧化铝阻燃效率低于三氧化二锑;然后研究了二元体系氢氧化铝和三氧化二锑、氢氧化铝和硼酸锌并用对软质PVC性能的影响,研究发现氢氧化铝和三氧化二锑、氢氧化铝和硼酸锌对软质PVC均具有协同阻燃作用。     

碳纤维材料在航空轮胎上的应用

研究分析了轮胎出现过快磨肩、磨冠等问题的力学原因,并针对导致该问题的主要原因"轮胎刚度较低导致轮胎长期过载工作",设计了一种新型高性能航空轮胎——"双刚圈"航空轮胎,在此基础上采用有限元方法对比分析"双刚圈"轮胎相对于传统轮胎力学性能上的优越性。分析结果表明:"双刚圈"轮胎纵向刚度明显提高,接触压力以及胎面橡胶等效应力分布均匀性都有明显改善,轮胎侧变形减小。因此,"双刚圈"轮胎通过提高轮胎真圆度提高了其操纵性、接地性使用性能,并且使用寿命有所提高。     

N‐Heterocyclic Carbene‐Catalyzed Umpolung Formal [3+3] Cycloaddition of Enals with Isatogens: Access to Fused Indolin‐3‐ones with a Tetrasubstituted Carbon Stereocenter

A novel synthetic method to access fused indolin‐3‐ones with a tetrasubstituted carbon stereocenter has been developed via NHC‐catalyzed umpolung formal [3+3] cycloaddtion of enals with isatogens. This methodology could be also applied for the quick construction of the 6‐5‐5 tricyclic pyrrolo[1,2‐a]indole skeleton which is frequently found as a core structure of many indole alkaloids.

     

Mechanical,morphology, and thermal properties of carbon fiber reinforced poly(butylene succinate) composites

Biodegradable poly(butylene succinate) (PBS)/carbon fiber (CF) composites were prepared by melt blending method using twin‐screw extruder followed by injection molding. Mechanical properties, crystallization behavior, morphology, crystal structure, and thermal stability of PBS/CF composites were investigated with different CF contents (0, 5, 10, 15, and 20 wt%). It was found that the tensile and impact properties of the composites were improved markedly with the addition of CF; while too much CF would lead to agglomeration and thus weaken the improvement. Scanning electron microscopic photographs on the fracture surfaces showed superior interfacial adhesion between fibers and PBS matrix. Crystallization peak temperature of PBS in its composites was increased due to the heterogeneous effect of CF. The spherulite size of PBS/CF composites decreased and the nucleation density increased drastically. The crystal structure was not affected by the incorporation of CF, as confirmed from the wide‐angle X‐ray diffraction analysis. thermogravimetric analysis showed that the thermal stability of PBS/CF composites was also enhanced. POLYM. COMPOS., 36:1335–1345, 2015. © 2014 Society of Plastics Engineers     

氯碱废弃物在纯碱厂的综合利用

氯碱行业生产过程中产生大量含Ca(OH)2的电石渣,由于碱性强,直接排放造成环境污染,处理后再排放成本高,同时其产生的淡盐水内部回收利用时,除SO42-费用高。这些物质正好是氨碱厂生产所需的原料,两者联合利用既可创造经济效益,又可解决氯碱行业电石泥污染问题。