彩涂钢板的耐污染试验

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通过适当的方法将彩板试样与污染接触一段时间，然后评定色差、光泽的变化及是否有涂层起泡、脱落等现象。彩板的耐污染试验主要用于评定供需协商的污染物对彩涂板涂层的影响。常用的污染物有:稀释的矿物酸、醋酸、肥皂溶液、洗涤剂溶液、乙醇、轻质流体和其他挥发性试剂、水果汁、油和脂肪、调味品、饮料、润滑油和润滑脂、鞋油、口红、记号笔等等。试验后可按照GB/T1766-1995标准对试样进行失光等级、变色等级、起泡等级、脱落等级等进行评定。

彩板耐污染试验通常用三种试验方法进行

(1)点滴试验(加盖):将污染物滴加在试样表面，并立即用表面皿盖上，试验时间推荐为24h

(2)点滴试验(不加盖):将污染物滴加在试样表面，并暴露于大气中，试验时间推荐为24h

(3)浸渍试验:将试样浸渍于污染物中，浸渍时间由供需双方协定。

The samples were exposed to contamination for a period of time by appropriate methods, and then the color difference, gloss change and whether there were foaming and falling off of the coating were evaluated. Pollution resistance test is mainly used to evaluate the influence of pollutants in supply-demand negotiation on the coating of color coated sheet. Common pollutants include diluted mineral acids, acetic acid, soap solutions, detergent solutions, ethanol, light fluids and other volatile reagents, fruit juice, oil and fat, condiments, beverages, lubricants and greases, shoe oil, lipstick, marking pens, etc. After the test, the samples can be evaluated according to GB/T 1766-1995 standards, such as loss of light, discoloration, foaming and shedding.

Three test methods are commonly used in pollution resistance tests.

(1) Drop test (capping): The contaminant is added to the surface of the sample and immediately covered with a surface dish. The test time is recommended to be 24 hours.

(2) Drop test (without cover): the pollutant is added to the surface of the sample and exposed to the atmosphere. The test time is recommended to be 24 hours.

(3) Impregnation test: The sample is impregnated in pollutants, and the impregnation time is agreed between the supplier and the demander.