PVC加工业对PVC树脂的需求及发展前景

简述了世界合成树脂的生产状况及目前国内PVC加工企业的概况，提出了加工企业对树脂的要求，介绍了几种对我国关系重大的特种树脂，分析了PVC树脂加工企业的发展动态，并对其发展前景进行了展望。     

我国微生物法水处理技术的研究进展

介绍了微生物絮凝剂的基本研究方法,综述了4种絮凝机理,对其絮凝效果的因素进行了探讨,阐述了微生物絮凝剂在众多领域的应用情况,指出了微生物絮凝剂在生产过程中的现存问题和解决措施,微生物絮凝剂具有高效、无毒,无二次污染、成本低等优点,为水处理技术的研究和发展提供了一个新的方向.     

玻璃工厂节能设计要求浅谈

强调了玻璃厂节能设计的目的和作用,列举了设计所依据的法律法规及标准规范,详细介绍了设计内容,提出了具体的节能措施和建议。     

聚氨酯/碳纳米管复合材料的制备及其性能研究

通过强碱球磨方法对多壁碳纳米管(MWCNTs)进行了改性处理,并对其化学结构和微观形态进行了分析.采用溶液共混法制备了聚氨酯(PUR)/MWCNTs复合材料.利用扫描电子显微镜、傅立叶变换红外光谱仪对其进行了表征.探讨了MWCNTs对PUR/MWCNTs复合材料力学性能、热稳定性以及电导率的影响.结果表明,MWCNTs...     

光、铁谱技术对修复剂性能与机理的研究

采用光谱、铁谱分析技术对添加了金属摩擦表面改性剂的机车进行分析研究,探讨了修复剂的作用机理。在润滑油中添加修复剂后,当机车运行了25000km时．润滑油中金属元素的含量仍在运行正常浓度的范围,且各金属元素的含量变化趋于平缓,超硬、超滑的保护层形成。在机车润滑油中加入修复剂可减少机车磨损,降低油耗、检修成本及延长机车寿命。     

非平衡等离子体水处理技术研究进展

回顾了高压脉冲电源的发展概况,对现行研究中使用的非平衡等离子体水处理反应器进行了分类,系统总结了液相、气相和气液两相放电反应器的研究现状,指出了待改进之处和发展趋势。归纳了脉冲放电过程中催化剂的使用状况,分析了催化剂在脉冲放电过程中的作用,指出了不同催化剂在使用过程中存在的问题及进一步研究的方向。     

Der Einfluß von Genotyp und Anbauort auf verschiedene Inhaltsstoffe von Samen des Ölkürbis (Cucurbita pepo L.)

Influence of Genotype and Cultivation Place on Various Ingredients of Oil-Gourd Seeds (Cucurbita pepo L.) In the seed of oil pumpkin from an international variety trial several components were analysed. The following results were found: 1. Oil contents were about 49% in mean and were significantly influenced by location, year, variety and by the interaction between location and year. 2. Protein contents laid about 38% in mean and were significantly changed by location. 3. Average crude fibre contents were about 5.17%. The interaction location/year was secured in F-test. 4. Oleic acid contents laid about 27.9% in mean and were influenced by variety, location, year and by the interaction location/year. 5. Average linoleic acid content was about 54.4% of TEA whereby differences within varieties, locations and years as well as interaction location/year were statistically secured. A negative correlation (r=-0.9915) exists between both fatty acids. 6. The tocopherol contents were 437 mg/kg oil in mean and were modificated analogous to oleic- and linoleic acid by variety, location, year and interaction location/year. 7. Average phosphatide contents were about 0.82% and were significantly influenced by variety, location as well as interaction location/year. 8. Mean values of the different minerals were: P = 211 ppm; K = 183 ppm; Mg = 105 ppm; Ca = 26.9 ppm; Na = 3.6 ppm. All elements were significantly depending on location, P and K were depending on variety, too.     

含氮酚醛树脂及其对环氧树脂的阻燃改性

简要介绍了环氧树脂的阻燃处理方法,详细说明了新型含氮阻燃剂的特点,合成了含氮酚醛树脂并将其用于对环氧树脂的改性,制得了电性能、阻燃性能均较好的环氧树脂。     

PVC热稳定剂研究内容及常用测试方法

综述了聚氯乙烯( PVC)热稳定剂的分类及研究内容,分析了近十年研究的热点,并指出了未来研究的方向.详细介绍了测试PVC热稳定剂效果的常用方法,指出了各种方法的特点,并做了一定的比较.     

溶液共混法制备聚氨酯／碳纳米管复合材料及其性能

 通过强酸处理方法对碳纳米管进行改性处理并对其结构和分散稳定性进行分析。采用溶液共混法制备了聚氨 酯/碳纳米管复合材料,利用FTIR对其结构进行了分析,探讨了碳纳米管对复合材料力学性能、热稳定性能以及弹 性回复率的影响。结果表明,碳纳米管经酸处理后添加了羧酸活性基团,提高了其在溶剂中的分散性|在复合材料 中,碳纳米管以较强氢键与大分子连接,复合材料的力学性能和热稳定性能都有所提高,而弹性回复率没有受到很 大影响。     

吡氟酰草胺2种混配剂防除覆膜蒜田杂草研究

将吡氟酰草胺原药配制成60%吡氟酰草胺·扑草净WP和60%吡氟酰草胺·乙草胺WP两种混配剂,每种混配剂分设有效成分720、900、1350 g/hm~2三个剂量,防除覆膜蒜田杂草。试验结果为吡氟·扑的株防效和鲜重防效为93.70%～99.17%和92.42%～99.72%,吡氟·乙的株防效和鲜重防效为91.96%～96.17%和85.11%～97.12%,除草效果都好于配伍单剂扑草净和乙草胺,且残效期长,对作物大蒜安全,增产效益显著。     

Adsorption of different molecular weight lignosulfonates on dimethomorph powder in an aqueous system

Different molecular weight lignosulfonates were acquired by ultrafiltration and their adsorption behavior on dimethomorph powder were investigated. The results showed that as the molecular weight of lignosulfonates increased the adsorption amounts increased and the adsorption processes were driven by van der Waals forces and hydrophobic effects. The adsorption isotherms were fitted well by Langmuir model. Relations of adsorption amounts and zeta potentials with particle size of dimethomorph particles were established to disclose the dispersing mechanism of dimethomorph suspensions. The average particle sizes were determined by zeta potentials rather than adsorption amounts, which confirmed the dispersing mechanisms were electrostatic repulsive forces.     

云南菊科植物微量元素含量逐步回归分析

用数理统计方法求出云南菊科植物中微量元素间的相关系数及逐步回归方程,７个元素的逐步回归方程均在０．０１十分显著的水平上相关,定量揭示了元素间的密切程度,找出了各元素含量间的内在规律,为深化元素生物地球化学行为及阐明宏观环境提供了科学信息。     

某些烷基二茂铁与丙酮的缩合

以酰氯为酰化剂，无水三氯化铝为催化剂，二氯乙烷为溶剂，对二茂铁进行酰化反应得到一系列酰基二茂铁，经Clemmenson还原法得到相应的烷基二茂铁，再用浓硫酸一甲醇体系做为催化剂，进行二茂铁与丙酮的缩合反应，经层析分离得到相应的双(烷基二茂铁基)丙烷。通过元素分析，红外光谱，折光率的测定，对目标化合物进行表征，并用循环伏安法研究其电化学性质，同时测试其在复合固体推进剂中的燃速催化性。     

Pulping Catalysts in Trees

Abstract

Several hardwood and softwood trees were analyzed for anthraqui-none-type components. Wood samples were reduced to a small size and extracted with an organic solvent; the extracts were then concentrated and analyzed by gas chromatography-mass spectroscopy. Low levels of AQ and anthrone components were detected using a sensitive selected-ion monitoring technique. Ten out of seventeen hardwood samples examined contained AQ-type components; however, the levels were typically below ～6 ppm. Such components were not observed for the few softwood samples that were examined. The AQs were more concentrated in the heart-wood of teak than in the sapwood. Extraction of cottonwood with an organic solvent had little effect on the ease of pulping of the wood.     

网络器气道截面形状与截面积对网络加工的影响

采用截面形状为椭圆形的丝道与截面形状为圆形和正方形的两种气道搭配,并分别取气道截面积与丝道 截面积比为1/2、1/4和1/6来制作网络器,通过改变加工参数来对网络器的加工性能进行试验,分析了网络器气道 截面形状与截面积对网络加工的影响。     

大豆皂苷分离纯化方法研究进展

大豆皂苷(soyusaponins),是从大豆及其它豆类植物种子中提取出来的,由低聚糖及齐墩果烯三萜缩合形成的一类化合物,具有广泛的生理功能.由于其组成复杂、含量低、不稳定,分离纯化难度很大.对大豆皂苷的分离纯化方法进展进行综述.     

新疆甘草中无机元素的比较研究

用火焰原子吸收法对新疆不同产地甘草中六种元素的含量进行了连续测定,并对结果进行讨论。同时用精密度和回收率试验考察了方法的可靠性。结果表明,甘草中各元素含量差异很大,不同产地甘草各元素的量也不相同。但普遍Ca含量最高,Fe和Mg的含量也较高,Cu和Zn的含量较低,还含有一定量的Mn。该试验相对标准偏差均小于5%,回收率在97.2%～106.4%,证明仪器工作比较稳定,结果可靠。     

Performance of Dowel-Welded L-joints for Wood Furniture

Rotationally welded wood dowels were used to hold together step butt and mortise and tenon L-joints and these joints were tested against European Norms for these types of joints. A factorial experiment was carried out in which (1) these two types of joints were tested, (2) 4 or 6 dowels per joint were used, (3) dowels were inserted at either 45° or 90° to the surface of the wood, (4) two types of wood were used, beech and European ash, and (5) two types of tests were carried out, namely compression and tension tests. The strength results were used to find out which of these were the most important individual parameters and their interactions, namely type of joint, number of dowels, and type of test. The strength results were well in excess of the relevant L-joints standard specifications for wooden windows.     

PVC抗冲改性机理和新型PVC冲击改性剂的设计

对PVC冲击改性剂——MBS、CPE和ACR的分子组成和分子结构进行了分析,研究了其抗冲改性机理及对PVC制品低温冲击强度、耐候性、维卡软化点、韧性的影响。从高分子热力学的角度分析了CPE和ACR在PVC中分散所形成的制品结构。指明了传统ACR和CPE在PVC改性中所存在的优缺点。在此基础上分析了理想冲击改性剂ACR应具有的结构特点,并设计和开发了新型冲击改性剂ACRHL-56和HL-58,通过试验对其性能与传统冲击改性剂ACR和CPE进行了比较,发现其性能远优于后者。