中欧美食品接触用塑料材料及制品法规差异分析

着眼于食品接触用塑料材料及制品管理要求、合规测试、产品信息传递,对比分析了当前阶段中欧美食品接触用塑料材料及制品在监管法规构成、原料管理、成型品管理、回收塑料管理、食品分类和食品模拟物、迁移试验条件、食品接触面积与食品模拟物体积比、符合性声明、标签标识等方面的差异,提出欧美法规对我国食品接触用塑料材料和制品法规的借鉴与参考,旨在进一步提升我国食品接触用塑料材料及制品标准水平。     

Experimental investigation and theoretical modeling on scale behaviors of high salinity wastewater in zero liquid discharge process of coal chemical industry

Zero liquid discharge (ZLD) treatment and reuse equipment of high salinity wastewater in coal-chemical industry often occur in various types of blockage problems because of high salt content, affecting the long-term stability of the device. In this study, the effects of solution temperature, steel, reaction time and wall roughness on fouling were investigated. The changes in the contents of fouling and fouling substances were qualitatively and quantitatively analyzed by XRD and EDS respectively, and the formation of scale was observed by SEM. The results show that with temperature increasing, Q235 steel is the most difficult to scale. Scaling rate of all salt scales reaches a maximum after 12 h, and the fouling rate decreases significantly from 12 to 48 h. It gradually stabilizes at 48 to 96 h. With the roughness increasing, the thickness of fouling layer increases, and a linear relationship is presented for 1 to 10 h. By comparing actual and simulated wastewater scaling rates, the relationship between actual and simulated wastewater scaling rates is y=ax^-0.494. The composition of the scale was analyzed, calcium carbonate is the main product and increases with fouling time. Based on the above-mentioned results combining literatures, the hybrid prediction model with calcium carbonate as the main product is put forward. It is discussed microscopically that calcium carbonate is converted from aragonite and vaterite in a thermodynamically metastable state to calcite in a thermodynamically stable state.     

含芳基高强度特种尼龙及其改性研究

通过尼龙6T盐与己内酰胺溶液共聚制备了含芳基高强度特种尼龙,对其各项性能进行了综合研究,通过添加玻璃纤维(GF)等方式对其进行了增强改性,在此基础上,对含芳基高强度特种尼龙及GF增强改性特种尼龙的应用前景进行了展望.     

固定管板式换热器耦合场有限元分析

对一固定管板式换热器采用APDL语言三维整体建模,通过ANSYS有限元法模拟稳态温度场与热应力场,并结合压力载荷分析了在耦合场作用下管板和管板周边结构的应力分布以及换热管拉脱力的大小,最后进行了强度校核,得到几种路径上的应力变化规律。     

EXTRACTION OF LINCOMYCIN WITH LONG-CHAIN ALCOHOLS AS SOLVENT

ABSTRACT

The extraction of lincomycin with long-chain alcohols as solvent was studied. The experimental results indicated that the power of n-alkyl alcohols for the extraction of lincomycin depends mainly on the molarity of alcohols in solvent used. For alcohols with short carbon chain, the steric hindrance of alkyl groups in alcohols with different structure has only little influence on the extraction of lincomycin. The chemistry of extraction of lincomycin with alcohols as solvent was discussed.     

光稳定剂对水工闸门用PE-HD/高岭土复合材料性能的影响

采用共混造粒制备含有不同光稳定剂的水工闸门用高密度聚乙烯(PE-HD)/高岭土复合材料,讨论和研究光老化前后复合材料的力学性能变化规律.通过偏光显微镜观察复合材料试样表面形貌、采用傅里叶变换红外光谱和核磁共振氢谱对表面析出物进行分析,讨论比较不同受阻胺光稳定剂的析出原因及抗光老化作用差异.结果表明,添加光稳定剂2020...     

以葡萄糖为造孔剂制备多孔羟基磷灰石涂层

采用电泳沉积方法在钛基材表面制得羟基磷灰石(hydroxyapatite,HA)/葡萄糖复合涂层,经烧结处理得到多孔HA涂层。采用红外光谱仪、扫描电镜、X射线衍射和热重分析表征了涂层的组成、表面形貌、物相组成及热稳定性,黏结-拉伸实验测定涂层与基体的结合强度,人体模拟体液(simulated body fluid,SBF)浸泡测定涂层的生物亲合性。结果表明:经700℃烧结处理,复合涂层中的葡萄糖微粒热分解得到多孔HA涂层,孔径为2～20μm,涂层与基体的结合强度可达17.6MPa;在1.5倍SBF(各离子浓度为SBF的1.5倍)中浸泡5d后,多孔HA涂层表面碳磷灰石化,呈现良好的生物亲合性。     

利用有效媒质理论对纳米金属薄膜介电函数的初步分析

利用有效媒质理论描述了纳米金属薄膜形成过程中介电函数的变化规律。与实验获得的纳米Ａｌ和Ｔｉ薄膜形成过程中的介电函数变化结果相接近。     

Pt-WC/Ti电极在酸性介质中的电催化析氢性能

通过复合电沉积技术制备出Ｐｔ－ＷＣ／Ｔｉ电极,并研究了Ｐｔ－ＷＣ／Ｔｉ电极在酸性介质中的电催化析氢性能,实验结果表明：复合电极的电催化析氢性能高于镀铂电极,性能的提高完全归因于电极比表面积的增加,该复合电极代替铂电极的使用具有一定的意义。     

国外润滑油基础油临氢催化加工技术新进展

概述了近几年国外润滑油基础油临氢催化加工技术新进展,内容主要涉及Ｃｈｅｖｒｏｎ和Ｍｏｂｉｌ两个公司的相关技术。