The invention relates to an automobile body coating, which is characterized in that the composite coating layer is the first non phosphate conversion film, the film thickness is 0.2~0.5 m, the second layer is a thin film with high throwpower electrophoretic coating, the film thickness is 15~18 m, the third layer is the water color paint film thickness 35~40 m, total the film thickness is 50.2~58.5 m; paint water paint coating is composed of plain coloured pigments accounted for 18~22% of the total, accounting for 14.5~15.5% of the total resin emulsion, hydrophilic water soluble resin melamine resin accounted for 5% of the total, accounting for 10% of the total, in the premise of ensuring the quality of the composite coating, the use of advanced no phosphorus pretreatment and aqueous paint free plain varnish coating process, shorten the process, reduce the coating process; the pretreatment of materials and films advanced high throwpower electrophoretic coating, waterborne coating single plain topcoat, reduce composite coating film thickness In order to reduce the investment in production line, reduce the use of paint, reduce the amount of VOC emission and reduce the comprehensive cost of coating, it can realize the green environmental protection coating.
【技术实现步骤摘要】
汽车车身复合涂层及其涂装方法
本专利技术涉及一种汽车车身复合涂层及其涂装方法,属于汽车涂装的
技术介绍
《重点区域大气污染防治“十二五”规划》要求:“新建机动车制造涂装项目,水性涂料等低VOC含量涂料占总涂料使用量比例不低于80%”;2015年1月26日国家财政部与税务局联合发布“关于对电池、涂料征收消费税的通知”:涂料生产企业对VOC含量超过420g/L的涂料需支付涂料价格4%的税。迫于环保法规的要求,新建的汽车车身涂装线面漆必须采用水性漆,无论是素色漆还是金属漆。目前汽车车身的素色漆涂层主要以白、红、蓝为主,水性素色漆目前成熟的涂装工艺是:热水洗→脱脂→水洗→纯水洗→表调→传统的锌盐磷化处理(温度35℃)→水洗→纯水洗→(钝化)→通用的阴极电泳→烘干→PVC喷涂→晾干→水性素色漆→流平→预烘干→烘干→溶剂型罩光漆→烘干,即3C2B工艺。复合涂层结构是:第一层是锌盐磷化膜(膜厚2~5μm),第二层是阴极电泳涂层(膜厚18~22μm),第三层是水性素色漆涂层(35~40μm),第四层是溶剂型双组份罩光清漆(30~40μm)。因为现有的水性素色漆涂层无法满 ...
【技术保护点】
一种汽车车身复合涂层,其特征在于:复合涂层的第一层为无磷转化膜1,膜厚0.2~0.5 μm,第二层为薄膜高泳透力电泳涂层2,膜厚15~18 μm,第三层为水性素色漆涂层3,膜厚35~40 μm,总膜厚为50.2~58.5 μm;水性素色漆涂层的面漆组成为:着色颜料占总量的18~22%,乳化型树脂占总量的14.5~15.5%,亲水基的水溶性树脂占总量的5%,三聚氰胺树脂占总量的10%,左右添加剂占总量的5%,左右助溶剂占总量的5%,剩余为去离子水;具体的涂装步骤如下:热水洗,温度为55~65℃,水洗时间为1min→脱脂,温度为55~65℃,时间为3min→水洗,常温下0.5m ...
【技术特征摘要】
1.一种汽车车身复合涂层,其特征在于:复合涂层的第一层为无磷转化膜1,膜厚0.2~0.5μm,第二层为薄膜高泳透力电泳涂层2,膜厚15~18μm,第三层为水性素色漆涂层3,膜厚35~40μm,总膜厚为50.2~58.5μm;水性素色漆涂层的面漆组成为:着色颜料占总量的18~22%,乳化型树脂占总量的14.5~15.5%,亲水基的水溶性树脂占总量的5%,三聚氰胺树脂占总量的10%,左右添加剂占总量的5%,左右助溶剂占总量的5%,剩余为去离子水;具体的涂装步骤如下:热水洗,温度为55~65℃,水洗时间为1min→脱脂,温度为55~65℃,时间为3min→水洗,常温下0.5min→纯水洗,常温下0.5min→无磷转化膜处理,温度为30~35℃,时间为3min→水洗,常温下0.5min→...
【专利技术属性】
技术研发人员:宋华,于泽淼,李元吉,赵冉,高成勇,张澍,庞虹,
申请(专利权)人:中国第一汽车股份有限公司,
类型:发明
国别省市:吉林,22
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