55dtex/36f中空涤纶全拉伸丝的开发

采用熔体直纺及环吹风纺丝技术生产55 dtex/36 f中空涤纶全拉伸丝,讨论了全拉伸丝的生产工艺及喷丝板的设计参数。结果表明:采用3C圆形中空喷丝板,选择纺丝温度292℃,环吹风风压22 Pa,拉伸热辊温度92℃,定型热辊温度120℃,拉伸倍数2.46,卷绕速度4 500 m/min,生产状况稳定,产品优等品率达95%以上,中空度达30%以上,织物保温率达20.45%。     

CaCl_2螯合沉淀-Fenton氧化联合处理HEDP镀铜废水

采用CaCl_2螯合沉淀-Fenton氧化联合处理湖南湘潭某机械厂1-羟基乙叉-1,1-二膦酸(HEDP)镀铜废水,研究了螯合剂CaCl_2投加量、反应pH,反应时间,Fenton反应pH、反应时间、H_2O_2用量,[Fe~(2+)]/[H_2O_2]比值等对处理效果的影响.结果表明,CaCl_2螯合沉淀-Fenton氧化联合方法能有效处理HEDP镀铜废水,在优化反应条件下,COD、TP和Cu~(2+)去除卒分别达到95.8%,99.8%和99.87%,出水基本达到电镀污染物排放标准(GB 21900-2008)要求.     

2,3-二甲基-4-(2,2,2-三氟乙氧基)吡啶-N-氧化物的合成

以2,3-二甲基吡啶为原料,通过N-氧化、硝化反应制得2,3-二甲基-4-硝基吡啶-N-氧化物,收率69.3%、质量分数98.5%以上;在相转移催化剂的作用下,2,3-二甲基-4-硝基吡啶-N-氧化物与三氟乙醇反应制得2,3-二甲基-4-(2,2,2-三氟乙氧基)吡啶-N-氧化物,收率74%、质量分数98.7%。化合物结构经~1H-NMR、IR确证。结果表明,本方法具有工艺简单、成本低、适应工业化生产的特点。     

某隔热涂层材料低温下应用性能研究

研究了某隔热涂层材料在不同固化时间下的低温性能,分析了该材料低温下断裂的原因,制订了解决措施。通过改进工艺可以有效提高材料涂覆质量和性能参数,降低断裂几率;通过低温筛选,可以减少材料内部应力不均现象,有效剔除不合格品。     

2009年我国热塑性工程塑料进展

根据2009年国内公开发表的文献,综述了我国热塑性工程塑料的研究进展,着重介绍了(丙烯腈/丁二烯/苯乙烯)共聚物、聚酰胺、聚碳酸酯、聚甲醛、饱和聚酯、聚苯醚等通用热塑性工程塑料的高性能化,聚苯硫醚、聚醚酮类、聚四氟乙烯等特种工程塑料的实用化,以及聚乙烯、聚丙烯、聚氯乙烯、聚苯乙烯、热塑性弹性体等通用塑料的工程化研究进展,展望了今后热塑性工程塑料的发展趋势。     

Influence of structure of amines on the properties of amines‐modified reduced graphene oxide/polyimide composites

Graphene oxide (GO), as an important precursor of graphene, was functionalized using alkyl‐amines with different structure and then reduced to prepare reduced amines grafted graphene oxide (RAGOs) by N₂H₄ · H₂O. The successful chemical amidation reaction between amine groups of alkyl‐amines and carboxyl groups of GO was confirmed by Fourier transform infrared (FTIR), X‐ray photoelectron spectroscopy (XPS), and thermal gravimetric analysis (TGA). Then RAGOs/polyimide nanocomposites were prepared via in situ polymerization and thermal curing process with different loadings of RAGOs. The modification of amine chains lead to homogenous dispersion of RAGOs in the composites and it formed strong interfacial adhesion between RAGOs and the polymer matrix. The mechanical and electrical properties of polyimide (PI) were significantly improved by incorporation of a small amount of RAGOs, the influence of structure of amines grafted on RAGOs on the enhancement effects of composites was discussed. The research results indicated that the proper structure of amine could effectively enhance the properties of composites. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43820.     

Mechanical property and morphology comparison between the two blends poly(propylene)/ethylene‐propylene‐diene monomer elastomer and poly(propylene)/maleic anhydride‐g‐ethylene‐propylene‐diene monomer

The comparison of the mechanical properties between poly(propylene)/ethylene‐propylene‐diene monomer elastomer (PP/EPDM) and poly(propylene)/maleic anhydride‐g‐ethylene‐propylene‐diene monomer [PP/MEPDM (MAH‐g‐EPDM)] showed that the latter blend has noticeably higher Izod impact strength but lower Young's modulus than the former one. Phase morphology of the two blends was examined by dynamic mechanical thermal analysis, indicating that the miscibility of PP/MEPDM was inferior to PP/EPDM. The poor miscibility of PP/MEPDM degrades the nucleation effectiveness of the elastomer on PP. The observations of the impact fracture mode of the two blends and the dispersion state of the elastomers, determined by scanning electron microscopy, showed that PP/EPDM fractured in a brittle mode, whereas PP/MEPDM in a ductile one, and that a finer dispersion of MEPDM was found in the blend PP/MEPDM. These observations indicate that the difference in the dispersion state of elastomer between PP/EPDM and PP/MEPDM results in different fracture modes, and thereby affects the toughness of the two blends. The finer dispersion of MEPDM in the blend of PP/MEPDM was attributed to the part cross‐linking of MEPDM resulting from the grafting reaction of EPDM with maleic anhydride (MAH) in the presence of dicumyl peroxide (DCP). © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2486–2491, 2002     

尿素高压热交换器列管腐蚀与检测

介绍尿素高压热交换器列管的腐蚀规律和特点，指明列管腐蚀检测的重点。     

热分解数据对研究火药临界工艺温度的指导意义

用示差量热法（ＤＳＣ）研究了药料初温、升温速率对火药热分解温度的影响,作为研究临界工艺温度的基础。     

醇类稀溶液的溶剂萃取研究

介绍了醇类稀溶液的溶剂萃取研究进展。在此基础上 ,提出了醇类稀溶液的萃取分离途径 ,并进行了实验研究。