拖拉机底盘水性漆涂装技术研究

基于拖拉机底盘零件喷涂水性漆的要求,对底盘零件水性漆的选择进行了介绍,对水性漆喷涂、烘干设备和供漆系统与油性漆设备的不同之处进行了描述,并对新建线的使用情况进行了简要说明,为农机企业涂装生产线建设提供参考。     

关于汽车涂装施工环境与油漆温度控制的研究

将雾化喷涂的涂料视为一种"理想混合气体",用克拉伯龙-克劳修斯(Clapyron-Clausius)方程式建立水性漆喷涂模型,得出控制水性漆湿膜溶剂含量概念的一种工艺方法。该方法通过提高喷涂过程中水性漆溶剂挥发速率,快速大量去除水性漆中的有机溶剂,来等效实现传统方法中湿膜在流平过程中的溶剂挥发量。该方法具有显著的节能减排效果,同时提升产品质量。     

汽车底盘用水性漆的开发及生产应用

根据汽车涂装线底盘用漆的现状和日益严格的环保要求，开发了适合汽车底盘件涂装的水性漆，并在生产线上得到了应用，提高了产品质量，降低了ＶＯＣ的排放量，有利于环保。     

工程黄色汽车内板水性漆膜针孔问题解决方案

为解决主机厂涂装车间工程黄色汽车内板水性漆膜针孔问题，首先通过调整工艺参数来模拟真实针孔弊病，再运用单因素变量的方法，分析讨论工程黄色面漆配方中溶剂种类及用量、消泡剂、润湿分散剂以及不同树脂组合搭配等不同因素对针孔的影响。结果表明：沸点低的溶剂含量越多，越易加速面漆漆膜的表干，从而加重出现针孔的程度；添加不同种类消泡剂对针孔问题无明显改善；优良的润湿分散剂可有效改善针孔问题；调整改善色浆研磨树脂的种类搭配可消除针孔。研磨树脂的选择是影响此次工程黄色汽车内板水性漆膜针孔的关键因素，选择与配方体系相容性佳的树脂对色漆产品良好的施工性至关重要。     

新型水性漆电泳涂装生产线的开发与应用

新型自动化水性漆电泳涂装生产线在当今开发对环境更友好、使用成本更节省、操作更便捷的技术发展趋势下应运而生。本文介绍了新型水性漆电泳涂装技术的工作原理、标准工艺流程、工艺特点、影响电泳涂层质量的关键因素、涂膜弊病与改善对策等。     

水性漆涂装工艺产生的废溶剂处理方法研究

根据水性漆涂装工艺产生的废溶剂的特点,选择"混凝+Fenton氧化"的工艺来处理废溶剂,介绍了工艺流程,分析了影响处理效果的因素。     

电泳漆工作液树脂变化的分析

一、引言用水性漆作底漆进行电泳涂装,目前已经广泛应用于汽车制造业。我厂有十多条这样的生产线投入生产,几年的生产实践证明,它基本上是成功的。但是不能不看到,有些电泳槽要发生各种各样的故障,使漆膜质量下降。为给改善漆膜质量提供依据,我对我厂使用的襄樊铁红酚醛电泳漆、天津铁红环氧改性油以及在我厂中试使用的天津铁红聚丁二烯电泳漆,进行了工作漆液在40℃下存放和在室温下搅拌存放的红外光谱测定。样品制备为了制得水性漆树脂,首先用离心机将颜料与水溶性树脂分离开来,然后,在真空干燥箱内,在40℃下将水和有机助溶剂蒸发出去。     

汽车保险杠水性漆工艺应用研讨

调研了国内汽车保险杠喷涂工艺及所用涂料水性化的现状,分析了保险杠涂料水性化的工艺趋势,介绍了常见的保险杠喷涂工艺流程,包括干式前处理、火焰处理等,制定了水性漆的漆膜性能要求,确定了水性漆验证方案并对2个涂料厂家的产品予以验证,据此建立了新的保险杠涂装生产线.     

水性漆静电喷枪的应用问题解决

水性漆静电枪在水性漆生产线投入应用初期遇到很多常见的问题,对生产和质量的造成了一定的影响。分析了水性漆静电枪常见问题产生的原因,并介绍了使水性漆静电喷枪能快速的投入生产应用所采取的有效的解决措施。     

水溶性醇酸树脂漆(醇酸/氨基)的相关技术

介绍水溶性醇酸树脂的制备方法和对助溶剂的选用、气干体系的干料配套及烘干体系潜催化剂的使用 ,并对水性漆的优、劣势进行了评价。     

炉渣氧化性对粘渣层与镁碳砖之间结合的影响

以镁碳砖为试样 ,采用不同氧化性的炉渣进行了粘渣实验 ,并且对粘渣层的结合状态进行了显微镜观察。结果发现 ,粘渣层与镁碳砖的结合状态受炉渣氧化性或炉渣熔点、粘度及其与镁碳砖反应活性的影响 :炉渣氧化性低 ,粘渣层与镁碳砖之间结合紧密 ,粘渣层厚 ;炉渣氧化性高 ,粘渣层与镁碳砖之间含有较大的气泡 ,粘渣层薄而不连续 ;采用含碳镁质材料调整炉渣氧化性后 ,粘渣层与镁碳砖之间结合状态得到改善。     

210 t顶底复吹转炉溅渣护炉模拟研究

对某厂210 t顶底复吹转炉进行了溅渣护炉水模型实验,测定了炉衬不同部位的溅渣量,考察了操作参数对溅渣效果的影响,得到最佳工艺操作参数为：顶吹流量50000 Nm3/h,枪位3680 mm,氧枪喷头倾角15°,留渣量21 t,底吹元件布置方式A1,底吹流量900 Nm3/h.     

防止罗茨风机齿轮甩油外溅的处理

本文针对罗茨风机齿轮甩油的现象及原因,重点介绍了防止齿轮甩油所采用的有效措施。     

复吹转炉溅渣层与镁碳砖之间结合的现场试验研究

将镁碳砖试样从出钢口送入复吹转炉内 ,溅渣 4min后抽出进行化学分析和显微镜观察。结果表明 :溅渣层的平均成分与溅渣前的炉渣大致相同 ;1 80t复吹转炉出钢口部位溅渣层平均厚度 1 0 .4mm ;本试验采用高氧化性炉渣进行溅渣 ,故溅渣层与镁碳砖之间有间隙存在     

高压水射流喷射枪具

介绍高压水射流喷射枪具构造特点及其应用经验.     

Splashing Characteristics of Monodisperse Sprays with Significant Viscosity Differences Impacting a Flat Surface

Drop impingement and splashing as a function of viscosity and, to a lesser extent, temperature are examined here. The working fluid is a mixture of water and glycerin with relative mass percentages varying from 0 to 100%, which spans a viscosity range of three orders of magnitude. First, a criterion that separates “on” and “off” for splashing as a function of glycerin percentage is expressed in terms of both Weber and Reynolds numbers and its highly nonlinear behavior is a function of the change in fluid viscosity. Next, the complex splashing characteristics of a rather simple monodisperse spray injected at a pressure of 2 bars onto a flat, 2-mm-diameter aluminum cylindrical rod are examined. Spatial variations in the fraction of splashed liquid, Sauter mean diameter, splashed droplet size distribution, and splash volume fraction as a function of radial distance for these mixtures are reported.     

Splashing needleless electrospinning of nanofibers

This article proposes a new needleless electrospinning apparatus applying the method of splashing polymer solution onto the surface of a metal roller spinneret. When a high voltage is applied, many spinning jets form on the free surface of polymer solutions. Multiple electrified jets undergo strong stretching and bending instability, solvent evaporates, and solidified nanofibers deposit on the collector, as in an ordinary single‐needle electrospinning process. The production of nanofibers is enhanced by 24–45 times comparing with a single‐needle system. And the productivity is easy to scale up. The effects of processing parameters, including solution concentration, applied voltage, distance between spinneret to collector, and rotational speed of the roller spinneret on the morphology of nanofibers are investigated in this article. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers     

抗飞溅涤纶DTY油剂的研制

现在使用的普通油剂在高速纺丝时会产生飞溅,不仅使操作环境恶化,还会对操作者的安全构成威胁。浙江传化股份有限公司研制的抗飞溅涤纶DTY油剂TF-702,通过在油剂中加入粘度较低的油改善产品的渗透性、加入表面活性剂降低油剂的表面张力,提高了纤维的亲和力,有效防止了油剂飞溅。在化纤厂的实际应用证实TF-702油剂的含油率和抗飞溅性能稳定。     

Modeling combustion of straw–bitumen pellets in a fluidized bed

Recently, straw–bitumen pellets have been proposed as an alternative fuel. In this paper, a comprehensive model for steady state combustion of straw–bitumen pellets in a bubbling fluidized bed is presented. The combustor is divided into three sectors: a dense bed zone, a splashing zone and a freeboard zone. Relevant phenomena including volatile release and segregation, char comminution and elutriation, bed particles ejection, and post-combustion above the bed have been taken into consideration. Energy equations for the splashing and freeboard zones have been established.     

Technique for delaying splashing in jet wiping process

The current study presents an experimental investigation of a technique for delaying the occurrence of splashing in jet wiping process by means of a side jet. Gas jet wiping is a hydrodynamic method of controlling the film thickness applied on a substrate in coating processes. It consists of a turbulent slot jet impinging on a moving surface coated with a liquid film. The process is limited by splashing; a rather violent film instability which is characterized by the ejection of droplets from the runback flow and results in the detachment of the film from the substrate. In the present study an additional side jet is used close to the main wiping jet in order to stabilize the runback flow and avoid splashing. The mean film thickness after wiping is measured using a light absorption method and the results are compared for the single jet wiping and two jet configuration. It is shown that the use of the side jet allows for stronger wiping, resulting in lower values of the final film thickness which cannot be achieved with a single jet.