涂料标准GB5211.8-85 颜料耐油性测定法

林允儿

大庆石化2426H
推荐简介：大庆石化2426H聚乙烯受日光中紫外光的映射和空气中氧气的效用，使其分子中的碳酰基含量增加而发生光时刻氧气老化效用，这种光氧气老化效用是在常温下施行的，它可使聚乙烯分子解聚，并生成一小批支链体格结构。　因为这个，为了避免或怠慢光氧气老化的效用，应在聚乙烯中添加具备遮藏光效用的牢稳剂，如炭黑或紫外光借鉴剂。低疏密程度聚乙烯按聚合办法，可分为高压法和低压法。依照反响器类型可分为釜式法和管式法。聚乙烯!!

本标准为颜料通用试验方法，用以测定颜料的耐油性。　　1 定义<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />颜料和油接触后，由于某些颜料微溶于油，会造成油的沾色，颜料的耐油性即是指颜料对抗油的溶解而造成的油沾色的性能。　　2 材料和仪器设备<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />精炼亚麻仁油（颜色用铁钴比色计按GB1722-79《清漆、清油及稀释剂颜色测定法》测定，不大于9；粘度用涂-4粘度计25℃测定，24~28s；酸值为3~4mgKOH/g；相对密度小于0.932）；<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />天平（感量为0.001g）；<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />注射器（容量为1ml）；<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />调墨刀（中碳钢或弹簧钢制，长178mm，最宽处宽18mm，最窄处宽7mm）；<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />平磨机（PM-240）；<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />滤纸（快速，GB1915-80）；<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />沾色灰色分级卡（GB251-84）。　　3 测定步骤<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />需做两份平行试验。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />3.1 色浆的制备<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />称取颜料样品0.2g，称准至0.001g，在室温下按下表的规定用注射器抽取精炼亚麻仁油，按GB1864-80《颜料色光测定法》第二章第2条"颜料色浆制备"研磨成浆。　　颜料类型　用油量，ml　每次研磨数　研磨次数<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />无机颜料　0.3　25　3<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />色淀颜料　0.4　25　4<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />有机颜料　0.6~0.8　50　4~6　　3.2 试样的制备<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />将上述色浆全部置于滤纸中心，待渗圈渗至由色浆的边缘至渗圈外缘的距离为2cm时，剪去色浆部分，即可评级。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />3.3 空白试验<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />将2滴精炼亚麻仁油滴于滤纸上，作评级对比用。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />3.4 沾色级别的评定。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />将有渗圈的滤纸与空白试验滤纸置于滤纸上。在朝北自然光照下，入射光与被观察物成45&deg;无须，观察方向垂直于被观察物表面，对照沾色灰色分级卡，目视评定渗圈的沾色级别。<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />3.5 平行试验结果<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />平行试验所得级别应相同。　　4 结果的表示<br style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; word-wrap: break-word; " />评定的沾色级别直接用来表示颜料的耐油性，最好为5级，最差为1级。沾色级别介于两级之间用4~5、3~4、2~3、1~2表示。