电镀挂具焊锡应用低压内热式大功率电烙铁效益卓著

电镀挂具为确保机械强度及导电性能,制造和维修中的焊接,均采用焊锡工艺。挂具焊接点大且多。长期以来,都采用火烙铁焊锡。用火烙铁焊锡,劳动强度大。效率低,质量差,特别是火烙铁须用煤炉或电炉加热(也有些单位用煤气或液化气加热),外散发热量多,环境温度高,污染严重。同时也欠安全。为了改变这种落后生产工艺,上海汽车配件厂姚德利同志于八五年下半年,开始研制低压内热式大功     

不同卷烟机用低温快干搭口胶的工艺参数优化及应用

采用低温快干搭口胶对卷烟机搭口烙铁温度、胶泵供胶的工艺参数进行优化,确定了不同机型(如ZJ17、PROTOS 2-2、PASSIM和GD121等)适宜的烙铁温度(如180、180、200、200℃等)、PROTOS 2-2机型的胶泵供胶量为9 g/500 m、PASSIM机型的胶泵转速为11 r/min和GD121机型的胶泵转速百分比为9%,并完成了多批次上机生产应用验证。研究结果表明:采用低温快干搭口胶生产的卷烟产品质量稳定,并且各卷烟机型的烙铁工作温度和烟支单支施胶量平均分别降低了27.6%和23.7%,而且烟条跑条、烟支爆口等总次数降低了84.5%。     

光敏阻焊剂

随着电子工业的迅速发展,对印制线路板的焊接质量要求越来越高。一部大型的整机设备,将由许多块印制线路板所组成,数万个焊点都要求焊接可靠,过去,这么多的焊点都是用烙铁一个焊点,一个焊点进行焊     

VAE系列高速卷烟机用乳胶的研究

此胶是种适应进口各种高速卷烟机上搭口、接嘴、成型包装用的粘接材料，粘接性能较好且烙铁温度可降低至１００℃￣１５０℃开机，使用方便。本文阐述了该粘结剂的原材料选举、配方设计、生产工艺、技术性能及经济分析。     

布雕——一种新的雕刻技艺

布雕,被誉为『中国民间工艺一绝』,它由民间工艺美术家王分忠发明。布雕是绘画技法与刻刀、烙铁等工具相结合,创造出的一种新的雕刻技艺,它集雕刻、剪纸、图画、油画、版画等美术、书法工艺之大成,开拓了一片新的艺术园地。     

烙笔点丹青——张革

用火烫的烙铁,在易燃的纸上烙出精美的画,似乎不可思议,然而,一位普通的农民,给我们捧出了一幅幅让人惊叹的作品……张革是大同市惟一一个烙画艺人。十多年前他偶然从电视上看到葫芦烙画引发了他浓厚的兴趣。凭着天份和幼时学习素描的功底他大胆地开始了烙画创作。为了满足创     

中温型PTC热敏电阻获省优称号

在1987年7月份结束的河北省1986年度优秀新产品评选工作中,邯郸市第一瓷厂研制的中温型PTC热敏电阻获河北省优秀新产品一等奖。这种产品具有速热、恒温、发热不受电流波动影响等特点,其电阻片的表面温度在120～200℃间可任意调整,耐压在330伏以上。它作为恒温式元件,维持恒温时,具有节省电能的特性,被广泛应用于电子驱蚊器、电子香炉、电热烙铁、电子烫发器、电     

低温快干卷烟搭口胶的制备与应用

采用高固含量乙烯-醋酸乙烯(EVA)共聚乳液制备了一种低温快干型卷烟搭口胶,其配方组成(质量份)为,EVA乳液93%~95%、PVA(聚乙烯醇)乳液2%~4%、辅助剂2%~3%;应用于7000~11000支/min的高速卷烟机上,结果表明,开机烙铁工作温度从原来的240℃降至160℃,卷烟设备供胶稳定、涂胶均匀,干燥速率较快,粘接牢固,烟支搭口光滑。     

怎样刷退光漆

<正> 在生漆髹涂技艺中,刷退光漆是最难的一种工艺。现以木扶手退光漆为例,介绍一下怎样刷退光漆,希望有助于新学漆生漆的油漆工。底层处理:要求扶手按设计制作型状式样,或扁或圆,对己损坏腐朽的木质和虫疤,用凿子铲出撕缝部分,尤其是松术节疤容易渗出油质铲净,用烙铁烧红将节疤烙焦,用刀铲净焦部分,出现新木质为准,对较大的撕缝和收缩退缝处用同型的木片加生     

新华村 荣马古道上的千年民艺

正新华村的手工艺经历宋、元、明、清至民国,至今已有上千年历史。南诏国时期,新华村手艺人就开始挑着手拉风箱和竹编篮子,装几把小锤、小錾子、火烙铁等简单工具,走南闯北地熔炼铜、铁、金银,加工成各种器具和首饰。当地人亲切地称他们为"小炉匠",外省人则称他们为"漾川银匠"。悠久的金属加工历史加上深厚的银器文化,以及巧夺天工的银制工艺,使得新华村被称为"中国民间艺术之乡"。很长一段时间内,新华村的手工艺制作水平代表了国内、国际银器加工的最高水准。     

湿法合成氧化铁颜料规律的探讨

总结和探讨了湿法合成氧化铁颜料一氧化铁黄、铁红、铁黑的基本规律,并对它们的合成条件,如硫酸亚铁浓度、pH值、温度、通气量、气体分散程度等因素进行了优化。这对湿法合成氧化铁颜料及其工业生产过程控制都具有一定的指导意义。     

工业循环水系统总铁与腐蚀的关系初探

论述了循环水系统总铁来源,碱度对总铁的影响,现场监测结果与总铁的平衡及余氯对总铁的影响.结果表明,循环水系统总铁的高低与补充水中总铁、浓缩倍数、碱度控制范围有关.在碱度较低时,循环水中总铁与碱度呈负相关关系.但当系统碱度超过一定范围(130 mg/L)以后,铁离子大部分形成沉积垢,总铁基本维持在低位且变化不大,此时用总铁判断系统腐蚀趋势已失去意义,应以现场监测结果为准.     

测定痕量铁用光度试剂(上)

化工产品大多需控制其痕量杂质铁含量。为此，本文特就近年文献上出现的铁的光度试剂，按其配位原子分类作一综述。     

低铁硅砂对浮法玻璃熔化工艺的影响

铁含量的变化,直接影响玻璃的颜色、玻璃的透光率,进而影响玻璃生产各指标的确定。普通浮法玻璃虽然没有一个明确的、固定的铁含量标准,但铁含量的稳定很重要。通过分析浮法玻璃熔制工艺及澄清工艺,结合生产实践,介绍了低铁玻璃特性,指出了玻璃生产中铁含量保持稳定的重要性,建议将原料铁含量纳入生产控制指标,避免由于铁含量波动对生产造成影响。各种原料的选择应有相对稳定的铁含量,特别是采用两种原料来作为互为备用时,更应该选择铁含量接近的物料,以达到在各物料切换使用时,熔化指标保持基本稳定。     

Iron Availability in Tissue Microenvironment: The Key Role of Ferroportin

Body iron levels are regulated by hepcidin, a liver-derived peptide that exerts its function by controlling the presence of ferroportin (FPN), the sole cellular iron exporter, on the cell surface. Hepcidin binding leads to FPN internalization and degradation, thereby inhibiting iron release, in particular from iron-absorbing duodenal cells and macrophages involved in iron recycling. Disruption in this regulatory mechanism results in a variety of disorders associated with iron-deficiency or overload. In recent years, increasing evidence has emerged to indicate that, in addition to its role in systemic iron metabolism, FPN may play an important function in local iron control, such that its dysregulation may lead to tissue damage despite unaltered systemic iron homeostasis. In this review, we focus on recent discoveries to discuss the role of FPN-mediated iron export in the microenvironment under both physiological and pathological conditions.     

铁纤维的常用制备方法及应用

从铁纤维的形成原理和制备与控制技术的角度出发，介绍了制备铁纤维的传统方法和还原法，模板法，磁场引导法等几种常用的化学方法，并简述了铁纤维在一般工业领域以及吸波和磁记录领域中的应用。     

Stabilization and functionalization of iron oxide nanoparticles for biomedical applications

Superparamagnetic iron oxide nanoparticles (NPs) are used in a rapidly expanding number of research and practical applications in the biomedical field, including magnetic cell labeling separation and tracking, for therapeutic purposes in hyperthermia and drug delivery, and for diagnostic purposes, e.g., as contrast agents for magnetic resonance imaging. These applications require good NP stability at physiological conditions, close control over NP size and controlled surface presentation of functionalities. This review is focused on different aspects of the stability of superparamagnetic iron oxide NPs, from its practical definition to its implementation by molecular design of the dispersant shell around the iron oxide core and further on to its influence on the magnetic properties of the superparamagnetic iron oxide NPs. Special attention is given to the selection of molecular anchors for the dispersant shell, because of their importance to ensure colloidal and functional stability of sterically stabilized superparamagnetic iron oxide NPs. We further detail how dispersants have been optimized to gain close control over iron oxide NP stability, size and functionalities by independently considering the influences of anchors and the attached sterically repulsive polymer brushes. A critical evaluation of different strategies to stabilize and functionalize core-shell superparamagnetic iron oxide NPs as well as a brief introduction to characterization methods to compare those strategies is given.     

Effect of iron on the properties of sulfated zirconia

Sulfated zirconia has found several industrial applications, mainly for catalyzing reactions which require acidic sites. In order to control the properties of this solid, the effect of iron on the sulfated zirconia properties was studied in this work. Samples with different iron to zirconium molar ratios were prepared by the sol–gel method, followed by sulfation and characterization by several techniques. It was found that all iron ions go into zirconia when Fe/Zr ≤ 0.4. However, when higher amounts of iron (Fe/Zr ≥ 0.8) are added, hematite is segregated. Different phases can be obtained depending on the iron content and on the sulfur presence. Iron increases the specific surface areas of both sulfated and pure zirconia but does not affect the incorporation of sulfate groups as compared to pure zirconia. Iron also makes the solids thermally more stable and modifies the sulfated zirconia surface creating acidic sites with medium strength. Therefore, it is possible to control the acidity of the solid doping the sulfated zirconia with iron. All these changes are very useful for catalytic applications.     

钢铁行业烟气多污染物协同控制技术应用实践

本研究分析了钢铁企业焦化和烧结两个重点工序中烟气污染物排放现状和钢铁行业当前的环保政策。对焦化及烧结烟气污染物的排放特征进行了分析,并通过对比燃煤电厂烟气特点,提出可以综合电厂烟气治理模式和自身特点改进的技术路线。结合某大型国有钢铁企业的脱硫脱硝装备对其环保现状进行了分析。针对焦化和烧结工序的典型污染物硫、硝、尘现有的源头减排、过程控制及末端处理技术,分析其优缺点。进而提出了3条可实现烟气污染物超低排放的技术路线,即半干法脱硫耦合选择性催化还原脱硝、半干法/湿法耦合臭氧氧化脱硝、活性焦脱硫脱硝一体化技术,重点介绍了这些技术在某大型钢铁企业的应用实践及应用效果。并基于全过程耦合技术,分别在焦化和烧结工序中提出了多污染物协同去除技术及应用,即焦炉低氮燃烧技术耦合末端活性焦多污染物协同控制技术、烧结烟气循环技术耦合末端活性焦多污染物协同控制技术。最后结合几种技术路线的应用实践,对未来钢铁产业的烧结及焦化工序超低排放技术的选择提出合理化建议。     

新型酸化用铁离子稳定剂研制

通过资料调研,油田油水井注水、酸化作业中的铁离子的二次沉淀所造成的地层伤害是一个潜在的问题。酸液本身带入地层的铁离子、酸液溶蚀管壁铁锈和地层中含铁矿物所产生的铁离子会因为pH值的升高而产生氢氧化铁沉淀。沉淀一经形成,就可能堵塞地层孔隙及油气渗流通道,进而降低酸化处理效果及油气产能。采用有机酸及金属盐与其它助剂复配,通过实验确定各组分最佳浓度配比,研制出一种铁离子稳定剂PY-33;依照行业标准《酸化用铁离子稳定剂性能评价方法 SY/T 6571-2003》对研制出的铁离子稳定剂的稳铁能力和高温老化后的稳铁能力以及配伍性进行评价。室内试验结果表明,该剂能有效地控制注入水酸化作业中的铁沉淀。