改性丙烯酸酯涂料的研究与发展状况

介绍了丙烯酸酯涂料的特性,分析了环氧树脂、有机硅、聚氨酯、有机氟和纳米材料改性丙烯酸酯的研究现状.通过改性大大提高丙烯酸酯的综合性能,拓展了丙烯酸酯涂料的应用范围,并对今后丙烯酸酯涂料的进一步研究提出了建议.     

紫外光固化改性环氧丙烯酸酯涂料的研制

通过对环氧树脂进行改性,降低其粘度,再用丙烯酸酯化,制得低粘度环氧丙烯酸酯预聚体,最后制备出性能优良、易于施工的紫外光固化涂料.本文对环氧树脂改性的催化剂、改性剂及其用量进行了实验研究,并制取改性环氧丙烯酸酯涂料,还对改性前后涂料的性能进行了比较.     

改性聚氨酯涂料的研究进展

综述了国内外利用丙烯酸酯、环氧树脂、有机硅、纳米粒子等对聚氨酯树脂改性在涂料中的应用进展;对近期聚氨酯涂料的改性作了重点描述,展望了改性聚氨酯涂料的研究方向及应用前景.     

TiO2紫外光固化新型涂料的研制

制备出双酚A类环氧丙烯酸酯齐聚物,并用马来酸酐进行改性,配制成紫外光固化新型涂料,考察了涂膜性能;研究了涂料成分中用TiO2作颜料,光敏剂二苯甲酮对紫外光固化树脂性能的影响.结果表明:马来酸酐改性的环氧丙烯酸酯树脂涂料对金属有较好的附着力,显示了较好的流平性;涂料中增加TiO2,其对金属的附着力有所增加;使用光敏剂增加了涂料的光洁度.     

紫外光固化聚氨酯丙烯酸酯的研究进展

介绍了紫外光固化聚氨酯丙烯酸酯的合成原理及方法,综述了紫外光固化水性、超支化聚氨酯丙烯酸酯及有机硅改性聚氨酯丙烯酸酯的研究进展,概述了紫外光固化聚氨酯丙烯酸酯涂料、胶黏剂、油墨等应用现状。     

丙烯酸酯乳液的改性研究与发展状况

丙烯酸酯乳液是一大类容易制备、性能优良、价格低廉、应用广泛,且符合环保要求的聚合物.丙烯酸酯乳液的改性研究已经得到了多方面的发展.介绍了丙烯酸酯乳液的基本特性,分析了有机硅、有机氟、聚氧酯和环氧树脂改性丙烯酸酯乳液的优缺点,综述了其改性方法及研究现状,对今后丙烯酸酯乳液改性的发展提出了建议.     

硅丙共聚物涂料的生产方法和应用

本文介绍了有机硅改性丙烯酸酯共聚涂料的品种,性能,主要应用市场和生产方法。     

MQ树脂改性UV固化涂料的制备及其在体育器材中的应用

为促进UV固化涂料在体育器材中的应用,用MQ树脂改性有机硅光固化树脂和聚酯丙烯酸酯齐聚物材料,以此分别制备UV固化涂料,分析MQ树脂对UV涂料的补强效果,并探究其在体育器材中的潜在应用特性.试验采用通过加入不同比例用量的试验原料进行了2组不同改性路线的UV涂料制备,并研究了改性后对样品的铅笔硬度、透光率和水接触角的影响.结果 表明:涂层表面硬度方面,MQ树脂改性有机硅光固化树脂会得到增强的效果,而MQ树脂对于聚酯丙烯酸酯的补强效果有限;涂层透光率方面,有机硅改性光固化树脂体系的透光率优于聚酯丙烯酸齐聚物体系,并且涂层透光率随着MQ树脂含量的增加而逐渐降低并趋近于0;涂层亲水性方面,MQ树脂含量一定时,随着有机硅光固化树脂和聚酯丙烯酸酯齐聚物用量的增加,涂层的亲水性增加;改变MQ树脂添加量时,在有机硅改性光固化树脂体系中几乎没有影响,在聚酯丙烯酸酯齐聚物体系中随着MQ树脂用量的增加,接触角度数逐渐减小,涂层的亲水性增加.     

丙烯酸酯/碳纳米管导电涂料的制备及其性能研究

将碳纳米管经过超声处理和表面包覆改性处理后,填充到丙烯酸酯中,制得一系列丙烯酸酯/碳纳米管导电涂料,考察了涂料相应的电性能、硬度、附着力、柔韧性等。结果表明,所制备的丙烯酸酯/碳纳米管涂料电阻达到了1×103Ω左右,涂料的附着力、硬度、冲击力等性能良好。     

聚丙烯酸酯材料改性技术概况

聚丙烯酸酯是一类由丙烯酸酯或甲基丙烯酸酯为主要原料合成的高分子聚合物,它具有良好的力学性能、耐候性能和耐酸碱性能,其制备工艺简单,成本低廉,被广泛用作皮革涂饰、建筑涂料和木材的成膜材料.但由于纯聚丙烯酸酯的抗菌性能、力学性能和热稳定性能较差,限制了其应用范围,因此,可通过化学改性和结构设计改善其性能.利用环氧树脂改性丙烯酸酯得到的环氧丙烯酸酯兼具两者的优点,拥有良好的耐候性和热稳定性.目前环氧树脂改性丙烯酸酯主要有三种方法:物理共混法、酯化改性法、接枝共聚法.聚氨酯一般由异氰酸酯和含活泼氢的化合物聚合而成,可分为聚酯型聚氨酯和聚醚型聚氨酯.聚氨酯丙烯酸酯复合乳液固化涂膜具有优异的耐高温性能和机械加工性能,已被广泛应用于油墨、涂料、胶粘剂等领域.聚氨酯改性的方法有:物理共混法、复合共聚法、核壳共聚法、互穿聚合物网络法.氟聚合物材料具有很多优异的性能,如极低的表面能、优异的稳定性.将含氟基团引入丙烯酸酯乳液中,在固化成膜过程中,含氟基团会向膜表面富集,保护其内部结构,从而获得了性能优异的丙烯酸酯树脂.有机硅是一类无机有机高分子,可以用来连接无机物与有机物.有机硅改性丙烯酸酯的主要方法有:缩聚法、自由基聚合法、硅氢加成法、互穿网络法等.纳米材料的发展也对聚丙烯酸酯的改性起到了积极的作用,纳米材料改性聚丙烯酸酯既可以弥补乳液本身的不足,也具有纳米粒子的优良特性,目前常用的纳米粒子主要有ZnO、Fe3 O4、Al2 O3、TiO2等.本文介绍了采用环氧树脂、聚氨酯、有机氟、有机硅和纳米粒子对聚丙烯酸酯进行改性的研究进展,综述了近年来这些改性物质的结构特点、改性方法、改性性能等方面的研究成果,并对其发展方向进行了分析和展望.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.