溴甲酚酯类复配物制备及其热变色性能的研究

制备了溴甲酚紫-硼酸、羧酸及其衍生物系列热变色复配物,考察其配比、填料的种类与用量、光照、高温等因素对其热色性能的影响.研究结果表明,以硼酸作显色剂,适合选用A12O3或硅胶为填料,当溴甲酚紫、硼酸、填料质量比为1:100:100～250时,变色效果好,由黄色变到粉红色,变色温度为110℃左右,复色时间小于60s;以羧酸类为显色剂,适合选用十六醇为填料,溴甲酚紫、显色剂、十六醇的质量比为1:1:10～1:4:40,变色效果好,由红色变成黄色,变色温度在40℃左右,复色时间小于100s.     

S/O型可逆热变色微胶囊的制备与性能

为改善无机热变色材料的可逆性能,采用油相相分离法,以无机变色颜料镍的化合物为芯材,乙基纤维素(EC)为壳材料,环己烷(HC)为溶剂,制备了S/O型可逆热变色微胶囊,并研究了微胶囊的结构、热稳定性和变色性能等。结果表明,S/O型可逆热变色微胶囊提高了芯材的热变色性能,具有良好的包裹和较强的保护作用。     

以二苯硫脲为显色剂的低温可逆示温涂料的研究

合成了显色剂二苯基硫脲,确定了可逆示温涂料的最佳质量配比为:龙胆紫:二苯基硫脲:高岭土=1:40:40.根据此配方配制了可逆示温涂料,并对其性能进行了测试,其变色温度为70～75℃,由粉红色变成蓝色,复色时间为10min.     

高温多变色可逆示温材料的研制

以无机物PbCrO4 为热敏变色颜料 ,无机非金属材料Al2 O3作为填料 ,确定了最佳涂料配方 ,即颜料 :填料∶漆基 =1∶1∶1时 ,研制成高温可逆示温涂料。其变色温度为 10 0℃ ,复色时间为 5秒。     

丙烯酸改性醇酸树脂热变色涂料的研究

论述了丙烯酸改性醇酸树脂和热变色材料的制备方法,并将热变色材料分散于丙烯酸改性醇酸树脂中,制备出丙烯酸改性醇酸树脂热变色涂料.结果表明:所得的丙烯酸改性醇酸树脂热变色涂料的性能优良,受热变色效果明显.     

一种粉色变蓝色的低温可逆示温涂料

本文采用水溶性醇酸树脂为基料,无机非金属材料(滑石粉)作为填料,钴铵盐作为变色物质,配制出在水中分散性较好的醇酸树脂,制备了一种粉色变蓝色的低温可逆示温涂料。针对所用的基料和清漆进行优化配制,配制出在水中分散性较好的醇酸树脂,可与颜料相溶。通过填料选择、变色温度及涂料性能的检测,确定了较佳涂料配方。研究表明:较优的物料质量比为漆基:变色颜料:填料=6:3:1。研制成的低温可逆示温涂料,变色明显,有实用价值,特别是在金属物体表面温度报警方面。     

制备条件对羟基氧化铝包覆氧化铁黄颜料耐热性能的影响

为了解决氧化铁黄颜料的热稳定性较差,受热易脱水变色,从而影响在塑料加工等领域应用的问题,采用沉淀法在氧化铁黄颜料表面包覆羟基氧化铝,来提升氧化铁黄颜料的耐热性,探索反应温度、包覆量和晶化时间等因素对颜料耐热性能的影响,并采用X射线衍射、红外光谱、热重-差热分析等手段对颜料结构进行表征。结果表明:优化包覆条件是温度为80℃,包覆层质量分数为15%,晶化时间大于4 h,在此条件下包覆氧化铁黄颜料的耐热性可以达到240℃;氧化铁黄的包覆层物相为羟基氧化铝,包覆后氧化铁黄受热分解分为2步,245℃处的吸热峰由表面羟基氧化铝受热脱水所致,295℃处的吸热峰由内部的氧化铁黄结构水分解所致。     

一种热致变色玻璃材料的制备及性能研究

研究了一种热致变色玻璃材料及其实用性能.测试了材料在不同温度不同厚度下的光透过率变化情况,选定了最佳的材料配方,确定了材料在玻璃中的最佳填充厚度为5mm.将该配方材料填充于夹层厚度为5mm的玻璃中,制成热致变色玻璃考察其透光遮光性能.结果表明,该热致变色玻璃材料在23℃时开始变色,在29℃时完全遮光,且过程可逆.通过模拟装置发现该热致变色玻璃材料能使得箱内外温差最高达到14.2℃,同时该热致变色玻璃材料良好的耐光性、耐热性及耐循环使用性表明了该材料的实用性能,为研发新型节能玻璃材料提供了可能.     

超低温热致变色复合物的制备与微胶囊包封研究

为了拓宽低温可逆热致变色材料变色温度和变色时间的范围,以聚乙二醇400(PEG400)为辅剂,十二醇等为隐色剂,变色母料为显色剂,无水乙醇为溶剂制备了超低温热致变色复合物;采用原位聚合法制备了以阿拉伯树胶为壁材,热致变色复配物为芯材的微胶囊,并对其进行显微结构、粒径、变色温度和变色时间等方面的测试与分析。结果表明:使用十二醇时,变色温度为5~15℃,变色时间为210s,颜色按照深蓝-蓝色-浅蓝的顺序变化。聚氨酯的引入使变色膜变色温度下降,但降幅较小,可以起到保温隔热的作用。微胶囊化后材料具有优良的耐疲劳性能,还扩展了变色材料的应用领域。     

谈纳米防伪技术的原理及应用研究（三）

(接上期)(四)纳米结构材料防伪技术1.新型纳米复合变色防伪膜变色薄膜是将高新技术纳米材料与金属膜复合,形成以A LSiO2/Cr为主体的多层薄膜,由于多层光学薄膜的干涉效应,薄膜反射光颜色会随角度的变化而变化,从而达到防伪的目的。另外,该膜层经粉碎后可形成变色颜料(OprycallyVariablePigment),将这种变色颜料按一定的比例掺入普通印刷用油墨中可应用于普通的印刷工艺,达到良好的防伪效果。为提高变色油墨的生产效率、降低生产成本,同济大学针对制约变色油墨生产中的溅射速率低的问题,经过近两年的努力,研制出新型纳米复合变色防伪材料…     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.