共查询到19条相似文献,搜索用时 156 毫秒
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《涂料工业》1979,(5)
我厂1976年5月配了一槽电泳漆,约80吨,开始使用良好,但由于生产使用时间短,放置时间长,槽液逐渐变质,两年后完全不能用于生产。为了挽救报废的电泳漆,我们在槽液内添加了表面活性剂。经过多次反复试验,取得了显著的效果,使80吨变质报废的电泳漆又重新投入生产使用。经过三个月来的连续生产考验,证明无论是槽液的管理、槽液的稳定性还是涂层的质量都比较理思。导致电泳漆变质的因素较多,如助溶剂的减少,PH值的变化,夏天霉菌的生长,生产过程中杂质离子的不断引进以及漆液组成中的树脂分子结构发生变化,使水溶性变差,因而逐步地与颜料一起沉淀,使槽液颜料与基料比例失调。根据这些分析,我们先后调节槽液的PH值,增加助溶剂,并对槽液进行超滤净化,使电导由5.1mS降到 相似文献
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高泳透力电泳漆通过配套新的树脂/固化剂体系,降低了槽液VOC,提高了固体分,从而提高电泳槽液的电导率及电泳湿膜的电阻,最终实现泳透力的大幅提升。因此,它可在保证内腔膜厚达标的基础上,较大幅度地降低外板膜厚,从而降低材料成本。对4种不同厂家生产的高泳透力电泳漆的泳透力和漆膜性能进行了测试,筛选出综合性能较好的产品,将其与在线产品进行混槽切换试验,测试了不同混槽比例的槽液参数及其所得漆膜的力学性能和耐蚀性,考察了电泳电压对冷轧板和镀锌板漆膜厚度及库仑效率的影响,证明了新一代高泳透力电泳漆在涂装线与普通电泳漆进行混槽切换的可行性。在以上研究的基础上进行高泳透力电泳产品的切换混槽生产,而且经过8个月完成了切换,汽车内腔膜厚得到了大幅提升。某车型的门槛腔体电泳膜厚从混槽前的7.45μm上升到混槽后的13.82μm,B柱腔体膜厚从混槽前的6.60μm上升到混槽后的9.53μm,满足汽车内腔防腐膜厚要求。 相似文献
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ED7000高泳透力薄膜电泳漆由某国际汽车涂料供应商所研发,能够满足白车身高泳透力的需求,并可降低涂料消耗和能耗。将ED7000乳液和色浆按8∶1的质量比在小型电泳槽内混合,加入纯水调整固体分至23%左右,在(32±2)°C下熟化48 h后进行相关的认证实验,测试了槽液参数和漆膜性能;将该电泳漆与三涂三烘工艺、免中涂工艺以及PVC、聚氨酯玻璃胶和玻璃水等进行相关的配套性试验,并在生产线进行试生产。研究表明,ED7000电泳漆具有高泳透力、低膜厚(15μm以下,含磷化层,可节约12%的涂料)、施工范围宽、槽液容易管理的优点。但它也存在电泳电压较高(高于常规工艺20 V左右)、粗糙度稍差(Ra为0.30~0.35μm)、顶盖上膜困难等缺点,适合在电泳面积较小的A级车和B级车上使用。 相似文献
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取一定量的电泳漆槽液,用蒸馏水稀释后,加入醋酸铵缓冲溶液,使溶液pH=6.5~6.8。以铜离子选择电极为指示电极,饱和甘汞电极为参比电极,用铜试剂标准溶液进行电位滴定。用二级微商法计算滴定终点,而间接求出电泳漆槽液中Zn^2+的含量。以铅离子选择电极为指示电极,用硝酸铅标准溶液进行电位滴定,用类似的方法即可测定电泳漆槽液中PO^3-4的含量。 相似文献
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介绍了阳极电泳涂料中有机溶剂的气相色谱分析方法。选用大口径ZB-624毛细管柱为分离柱,FID为检测器,内标法进行定量,并对该方法的精密度、准确度进行了讨论;通过对试验条件的优化,采用内标法定量,建立了一种快速、准确的分析方法,试验证明该方法准确可靠,简单易行。 相似文献
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N. Saranjam S. Chandra J. Mostaghimi H. Fan J. Simmer 《Journal of Coatings Technology and Research》2016,13(3):413-426
Paint films with uniform thicknesses ranging from 150 to 820 μm were applied on stainless steel substrates using a model paint consisting of a resin dissolved in butanol and the test samples were cured in a natural convection oven at a temperature of 140°C. Photographs of the paint surface were taken during drying, and the weight loss was measured. Cellular structures appeared on the paint surface, induced by surface tension-driven flows due to solvent concentration variations. For thin films (<500 µm), the patterns disappeared in a few minutes and the dried paint surface was smooth, while for thicker paint films, wave-like structures remained on the hardened paint layer, creating an uneven surface. An analytical solution of the mass-diffusion equation was used to model solvent evaporation from the paint film and to calculate the concentration gradient and surface tension variations in the paint films. In thin films, all the solvent was depleted, and surface tension gradients disappeared before curing was complete, allowing the surface to become smooth. In thicker films, concentration gradients that drove cellular flows persisted until the paint dried, leaving orange peel on the surface. 相似文献
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An aqueous ambient crosslinkable polymer acrylic (AACPA) emulsion was obtained by adding adipic acid dihydrazide (ADH) to the polyacrylate emulsion incorporating diacetone acrylamide (DAAM), and this emulsion was synthesized by two feeding materials methods. The AACPA emulsion and its paint film were characterized with rheological measurements, laser light scattering, Fourier transform infrared, torsional braid analysis (TBA), DTA, and so on. The results showed that AACPA emulsion was pseudoplastic fluid and pseudoplasticity increased with increasing of DAAM content. The results also showed that water resistance, solvent resistance, and thermotacky temperature of AACPA paint film increased with increasing of the content of DAAM. The results dealing with curing behavior of the paint film showed that adding organic swelling solvent and organic acid to the AACPA emulsion can accelerate the curing speed of the paint film. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
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根据水解原理,以NaOH为主溶剂,CTMAB为表面活性剂,尿素为助溶剂,1,2-丙二醇为辅助添加剂,在恒温水浴条件下制备了一种针对食品罐用镀锡钢板的无机碱性脱漆剂。考察了主溶剂、表面活性剂、助溶剂及辅助添加剂的种类、用量以及温度对脱漆效率的影响,同时探讨了脱漆剂的理化性能、综合性能、挥发速率及腐蚀性。结果表明:当NaOH为5.0 g,CTMAB为0.3 g,尿素为0.6 g,1,2-丙二醇为0.2 g,在70~75℃时,所得脱漆剂的脱漆效果最高,挥发性和腐蚀性低,3~5 m in内可使镀锡钢板底色样板漆膜软化、脱落。 相似文献