几种聚脲体系的固化反应动力学研究

采用非等温差示扫描量热(DSC)法研究了不同升温速率下F524树脂、F520树脂、W-a树脂、W-b树脂以及W-a/W-b混合树脂与HDI三聚体的固化反应过程,通过模拟n级反应动力学模型,采用Kissinger方程和Crane方程计算出各聚脲体系固化反应的动力学参数,对比研究了各单一树脂体系以及混合树脂体系的固化反应影响规律。研究发现:4种单一树脂体系的固化反应活性及反应速率与树脂体系的分子量有关,树脂体系分子量越小,反应活性越高,将不同分子量树脂混合后的树脂体系,其固化反应活性及反应速率相较于单一树脂更高。     

壳法用酚醛树脂粘连现象的机理及影响因素

对壳法用酚醛树脂在出现粘连现象前后的玻璃化转变温度进行了检测,结果表明出现粘连现象后树脂的玻璃化转变温度大幅降低,且树脂的玻璃化转变温度与粘连温度相差无几,说明树脂出现粘连现象时发生了玻璃化转变.并分析了含水量和软化点对树脂玻璃化转变温度的影响,结果表明含水量的增加会降低树脂玻璃化转变温度和树脂的抗粘连性能,软化点的升高会提高树脂的玻璃化转变温度和树脂的抗粘连性能.     

无锡万博涂料化工有限公司成功研制新型氟碳涂料系列树脂

对卷材工业而言．氟碳树脂并不陌生，较早的热塑性分散体氟而树脂及涂料的应用已近30年。为改善涂膜．必须拼入丙烯酸树脂，但是普遍采用热塑性丙烯酸树脂．光泽不理想。无锡万博氟碳树脂有限公司自行开发出相容性好的热固性丙烯酸树脂。FEVE氟树脂涂料除了具有PVDF体系具有的颜料润湿性和附着力和柔韧性外．     

乙烯基酯树脂耐低温性能探讨

乙烯基树脂是目前广泛应用的一种树脂，本文对乙烯基树脂的耐低温性能进行了介绍，介绍了乙烯基树脂在低温环境中的应用。     

糠醇树脂玻璃钢性能和化工贮罐的制造

呋喃树脂是耐酸、碱、溶剂腐蚀的好材料。常见的呋喃树脂有糠醛树脂、糠酮树脂、糠醇树脂,糠醇-糠醛树脂等。 本文介绍我们使用过的糠醇树脂玻璃钢情况。 1 糠醇树脂玻璃钢性能 糠醇树脂是以糠醇经缩聚而成的黑色粘稠状的热固性树脂。糠醇树脂可在室温下进行固化,固化后的糠醇树脂具有优良的耐腐蚀性(如对非氧化性酸、碱、有机溶剂均有突出的耐腐蚀性)、热稳定性和电绝缘性等。     

海洋防污涂料用功能树脂发展概述

防污涂料中树脂的发展与防污涂料的发展有着密切的关系,总结防污涂料的发展历史,防污涂料技术的发展依赖于新型树脂的开发和新型防污剂的开发两条主线。在不同的时期,根据防污涂料中树脂的性能及其对防污剂的释放方式不同,导致了不同的防污涂料具有不同的防污原理和防污效果,因此开发具有良好性能的树脂是发展高性能防污涂料的关键之一。随着海洋事业的迅速发展及世界环保方面的限制,无公害新型合成树脂的发展成为迫切的需要。由于无锡自抛光树脂、抗菌活性结构功能树脂、低表面能树脂等除了使树脂具有成膜物的一切功能外,还使树脂本身具有优秀的防污性能且满足环保的要求,对防污涂料树脂及新型无公害防污涂料的发展意义重大。本文介绍了无锡自抛光树脂、含抗菌活性结构功能树脂的最新发展,揭示了用新方法和新思路开发具有我国自主知识产权的海洋防污涂料树脂的重要性。     

国产与进口三乙胺冷芯盒树脂性能对比研究

对国产冷芯盒树脂和进口冷芯盒树脂的常规性能指标以及非常规性能指标如抗湿性、可使用时间、超低树脂加入量等进行研究对比。结果表明,国产树脂主要常规性能指标与进口树脂差距小于5%,无明显差异。24 h高湿抗拉强度、可使用时间等指标与进口树脂差距在5%以上,存在一定差异。     

高性能特种耐腐蚀热固性树脂在氯碱行业中的应用

在多年的高性能热固性树脂应用的实践经验基础上,结合目前国内外氯碱行业中的防腐蚀技术发展,本文就几种高性能热固性树脂在氯碱行业中的应用进行了介绍与总结,其中包括海特酸型特种不饱和树脂和几种乙烯基酯树脂,就不同树脂类别的性能尤其是防腐蚀性能进行了分析与研究,并重点阐述了树脂在氯碱行业中的的适用场合以及应用细节等。这些树脂的应用细节也可作为其它相关行业的参照。     

铁污染阳离子交换树脂的复苏比较及测定

铁污染阳离子交换树脂常用HCl进行复苏。为使树脂充分复苏，需用浓度高达10％HCl溶液浸泡树脂。采用HCl-NaCl-Na2SO3复合复苏剂，其各组分浓度依次为5％、4％、0．06％，能快速使树脂充分复苏，因酸浓度低，腐蚀性弱。并对HCl复苏剂和复合复苏剂浸泡后的树脂进行工作交换容量测定。复合复苏剂对树脂复苏效果好，而且树脂的工作交换容量高。     

国内专利文摘

包含如酚树脂等热硬化性树脂的树脂结合相及分散于该树脂结合相中的金刚石（或CBN等）超磨粒，组成树脂粘合研磨工具的磨粒层。耐磨填充料分散在树脂结合相中，其包含例如SiC作为硬质填充料，以及中空玻璃、以及有金属被覆层的无定形炭。无定形炭制成球状，其表面设有像高热导率金属例如Cu组成的金属被覆层。     

工艺因素稳定性对冷硬铸铁凸轮轴质量的影响

大批量生产实践表明：工艺因素的细微波动会对神龙凸轮轴的材质产生大的影响，工艺因素的控制要保证“五个稳定”，即炉料配比稳定，过热温度和时间稳定，化学成分稳定，孕育剂加入量和白口深度稳定，浇注温度和时间稳定。加强工艺过程管理，保证工艺因素的“五个稳定”后，神龙凸轮轴材料质量废品率控制在3％以下，综合废品率控制在10％以下。     

Korrosionsgeschützte Verbindungselemente. Neue Entwicklungen - Erste Normen

Corrosion-protected connecting devices. Recent developments. First Standards With connecting devices, manufacture and materials should be attuned to each other in order to attain optimum results. Through cold forming, higher yield limits can be reached which prevail even at temperatures up to 400° C and entail considerable savings in size. According to German Standards DIN 267, Sheet 11, the conventional specifications for the material alone are superseded by quality specifications. While meeting the minimum requirements to be guaranteed, the manufacturer is free to choose, from among the steels of the specified group, those steels which in conjunction with the manufacturing process produce the best results. Testing and acceptance conditions should be adapted to the application conditions. Previously standardized, conventional testing methods should be modified. The tensile test should be carried out on entire bolts; nuts subjected to the load test should be exposed to the rupture load corresponding to the quality of the bolts to which they are to be fitted. Practical experience and the results of calibration tests do not suggest that the corrosion strength of the connecting devices would be impaired by cold forming under such conditions. Appearance and corrosion resistance can be improved by electro-polishing. With nitrogen-alloyed austenitic chrome-nickel steels, the mechanical strength characteristics can be improved still further while the torrosion resistance remains at least as good.     

覆砂金属型铸造工艺在磨球生产线上的应用

介绍了覆砂金属型合金白口铸铁磨球铸造工艺的特点及生产中的应用情况.该技术可实现磨球的自动化流水线生产,改变手工作业的生产方式.在确保产品质量,改善工作环境的同时,降低工人的劳动强度,提高生产效率.     

大型风能铸件的材质标准和熔炼技术要点

欧洲标准EN1563：1997增加了铸件本体试样的检测;根据买方和制造厂的协议,抗冲击值和硬度均可单独作为验收标准,无须同时提供其他力学性能的检测数据。我国许多铸造厂进口了大型感应电炉,冲天炉＋铸造焦和国外水平对比大致相同。铸态铁素体球铁的熔炼技术要点是①精选高纯炉料,②确保铁水过热温度不低于1530℃,③75％硅铁的加入方法或时效性比加入量更重要。     

Full surface inspection methods regarding reinforcement corrosion of concrete structures

For reinforced concrete structures a localisation of all significant critical areas can only be done by a full surface inspection. The economic advantages are obvious: uncritical areas have not to be repaired expensively 1 . The first step of the assessment should always be a visual inspection 2 . The range of deterioration causes can be limited and the degree of deterioration may be estimated roughly. The inspection program can be adjusted to the requirements. By means of a full surface potential mapping areas with a high risk for chloride induced reinforcement corrosion can be localised, although no deteriorations are visually detectable at the concrete surface. In combination with concrete cover depth and resistivity measurements areas with corrosion promoting exposure conditions can be localised even if the reinforcement is not yet depassivated. The following publication gives an overview about the essential full surface investigation methods to localise critical areas regarding corrosion of steel in concrete. The selection of methods is based on the inspection procedure given in 2 .     

Developing an integrated information system in a modern aluminum smelter

The developments in the aluminum markets demand that more use be made of the information available within a smelter. Quality must be made measurable and verifiable; the organization continually must be optimized, and the production processes must be steadily improved. Costs have to be supervised, deviations immediately reported, countermeasures taken at once. These elements offer protection against the pressure of the market and allow competitive high-tech products to be produced and timely investments to be targeted and made. With the help of information technology, it is ever more possible to keep up with these demands. This article describes the design and realization of a completely integrated data transmission system in a modern aluminum smelter operated by VAW Aluminium AG. Several examples of practical implementation are given.     

冶炼副产物中金银的富集新工艺

甘油在有碱参与的条件下能与三氧化二锑很好地发生反应,生成甘油亚锑酸钠,溶液在一定的碱浓度下保持稳定。氧化铜、氧化铋、氧化铅也能反应生成双金属醇盐,而氧化态的银被还原生成金属银。用甘油、木糖醇等低炭多元醇的强碱水溶液处理复杂的含Au、Ag物料时,贱金属氧化物生成双金属醇盐溶解脱除的同时,Au、Ag等贵金属被富集在渣中。可用电沉积或中和水解的方法从醇盐溶液中回收各种有价金属,并实现甘油等低炭多元醇的循环再生,为处理复杂的含金银物料提供了1种新方法。     

均匀化退火工艺对6060铝合金挤压材力学性能的影响

研究了不同均匀化退火制度对6060铝合金挤压型材性能的影响。通过对6060铝合金铸锭的金相显微组织和型材力学性能分析得出,在合适的均匀化退火制度下,可以有效消除6060铝合金铸锭组织的枝晶偏析和非平衡相的熔解,达到缩短均匀化时间,提高挤压速度、改善型材表面质量。     

重轨开坯机轨形孔车削方式研究

攀钢轨梁厂万能线开坯机轨形孔侧壁磨损严重,使用后如果每次车修到位,一套轧辊仅能使用2次。采用头底侧展宽车削可使车削次数增加到4～5次,但每次车削后头底金属量比均发生变化,轧件弯曲度变化不定,影响产品质量及运行安全。本文结合仿真分析,提出一种腰部腹腔展宽车削法,其在不减少轧辊车削次数的情况下,既可保证断面规格尺寸精度,又可保证万能区轧件出钢平直度不随BD车削而变化,现场使用效果明显。     

Controlling the Cold Roll Forming Design Process

The cold roll forming process requires successive forming profiles to be determined and an appropriate number of profiled roll sets to be designed for the product to be rolled. This paper examines the design process and how one company has put in place a design-production control system that allows designs to be ranked in terms of quality and efficiency. In addition, consideration is given to the proportion of time given to each design task and how non-creative design activities can be automated.