高吸水树脂的研究进展

介绍了高吸水树脂的分类,综述了其研究进展,并展望了研究发展方向。     

Carbonaceous microsphere-based superabsorbent polymer as filler for coating of NPK fertilizer: Fabrication,properties, swelling,and nitrogen release characteristics

Recently, the use of controlled release fertilizers in agriculture has resulted in huge benefits in plant growth and cultivation. Superabsorbent polymer (SAP)-coated fertilizers have the added advantage in retaining water in soil after irrigation and also reduce the nutrient release rate from soil in a controlled manner. This study aimed to produce a nitrogen–phosphorus–potassium (NPK) fertilizer coated with superabsorbent carbonaceous microspheres polymer (SPC) by inverse suspension polymerization method with water-retention and controlled release properties. Two sets of experiments were conducted: (1) three different weight percentages and (2) different materials. NPK coated with SPC showed increasing water-retention ability with respect to carbon microsphere percentages and retains >80% water at the 30th day of experiment compared with pure NPK and NPK coated with SAP. The slow release behavior of all samples was investigated by induced coupled plasma mass spectrometry spectrometry and results showed that NPK coated with SAP and SPC has a low release rate with <50% nutrient release compared with uncoated NPK at the 30th day. The release mechanism kinetics of NPK coated with SAP and SPC were studied based on the Kosmeyer–Peppas model. The mechanisms approached Fickian diffusion-controlled release as the n value for both samples was less than 0.5. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48396.     

预处理温度对SAPO-11催化丁烯骨架异构化性能的影响

采用水热合成法合成的SAPO-11分子筛,经酸洗、干燥和焙烧处理得H-SAPO-11分子筛,考察了预处理温度对催化剂物化性能的影响,采用XRD、XRF、IR和NH₃-TPD等手段对催化剂进行表征。实验证明,500 ℃预处理后H-SAPO-11分子筛的结构缺陷较少,B酸位较多,骨架更完美;将其成型制成催化剂,对丁烯骨架异构化反应显示更优良的催化活性、选择性和稳定性。     

亚洲丙烯酸及其衍生物市场看好

预计 2 0 0 3～ 2 0 0 9年世界丙烯酸消费年均增长率为 3 5 % ,亚洲将达到 7 5 % ,中国则高至 2 0 %。丙烯酸的主要用途是生产丙烯酸酯 ,包括丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯和丙烯酸异辛酯。此外还可用于生产SAP ,但SAP用丙烯酸占丙烯酸总消费量的比例不大 ,而且在亚洲的增长会比较缓慢     

Analysis of the Insect OS-D-Like Gene Family

Insect OS-D-like proteins, also known as chemosensory (CSP) or sensory appendage proteins (SAP), are broadly expressed in various insect tissues, where they are thought to bind short to medium chain length fatty acids and their derivatives. Although their specific function remains uncertain, OS-D-like members have been isolated from sensory organs (including the sensillum lymph in some cases), and a role in olfaction similar to that of the insect odorant binding proteins (OBP) has been suggested for some. We have identified 15 new OS-D-like sequences: four from cDNA clones described herein and 11 from sequence databases. The os-d-like genes from the Anopheles gambiae, Apis mellifera, Drosophila melanogaster, and Drosophila pseudoobscura genomes typically have single, small introns with a conserved splice site. Together with all family members entered on GenBank, a total of 70 OS-D-like proteins, representing the insect orders Diptera, Dictyoptera, Hymenoptera, Lepidoptera, Orthoptera, and Phasmatodea, were analyzed. A neighbor joining distance phenogram identified several protein similarity classes that were characterized by highly conserved sequence motifs, including (A) N-terminal YTTKYDN(V/I)(N/D)(L/V)DEIL, (B) central DGKELKXX(I/L)PDAL, and (C) C-terminal KYDP. In contrast, three similarity classes were characterized by their diversion from these conserved motifs. The functional importance of conserved amino acid residues is discussed in relation to the crystal and NMR structures of MbraCSPA6.     

反相乳液聚合法制备P（AA-AMPS）高吸水树脂的合成及其性能结构研究

文章以2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、丙烯酸（从）为共聚功能单体,过硫酸钾（KPS）,过氧化苯甲酰（BPO）为引发剂,聚乙二醇双丙烯酸酯（PEGDA）（Mw=700）为交联剂,以Span-60,Triton X-100为复配乳化剂,通过反相乳液聚合法制备两性离子型高吸水树脂,研究了SAP的合成条件,详细探讨了聚合过程中各种因素对SAP性能的影响,SAP结构与性能的关系等.     

基于财务会计概念框架的会计信息系统的重构

随着信息技术的不断发展和进步,对财务会计概念框架的影响逐渐深入,会计信息系统的完善和使用成为企业财务工作进展的必然工具。但是以概念框架为基础制定的会计准则表现出不完善和更新较慢等缺陷,本文就是在这一社会现实背景下,结合SAP R/3软件设计及会计目标等,对会计业务流程重组、网络财务报告语言(XBRL)做了进一步分析,从而实现了基于财务会计概念框架的会计信息系统的重构。     

SAP前处理方式对30μm／30gm精细线路制作的影响

对于半加成法（SAP）制作精细线路,铜箔表面粗化处理效果直接影响其制作能力和产品良率。本文通过表面粗糙度测量、SEM分析和贴膜效果观察,分别对火山灰粗化、化学药水微蚀、喷砂等几种前处理方式的处理效果进行评估,并确定制作精细线的最佳前处理方式。     

SAP库存计价方法的研究与应用

库存价值的确定是否正确、科学、合理,直接影响着库存的核算,从而影响企业损益的计算。对SAP系统两种计价方法进行了研究,分析了两种方法的优缺点,并且介绍了移动平均价在中国石油销售ERP项目上的应用。     

羧甲基纤维素接枝共聚制备多元高吸水性树脂

高吸水性树脂（Super absorbent polymet．简称SAP）是一种含有强亲水性基团．并通常具有一定交联度的水溶胀型高分子聚合物,是20世纪60年代开始发展起来的新型功能高分子材料。高吸水性树脂的吸水量大、保水性强,即使在受热加压下也不易失水。随着经济的高速发展和环保意识的增强．高吸水性树脂的应用范围不断扩大．市场需求日益增加．研究开发也日趋活跃。