什么是彩涂卷耐污染实验

通过适当的方法将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。彩涂卷耐污染试验主要用于评定供需协商的污染物对彩涂卷涂层的影响。

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。

彩涂卷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。

Contact the sample with the contamination for a period of time by appropriate methods, and then evaluate the color difference, gloss change, and whether there are blistering, peeling and other phenomena of the coating. The pollution resistance test is mainly used to evaluate the influence of pollutants negotiated by supply and demand on the coating of color coated sheet. Common pollutants include diluted mineral acid, acetic acid, soap solution, detergent solution, ethanol, light fluid and other volatile reagents, fruit juice, oil and fat, condiments, beverages, lubricating oil and grease, shoe polish, lipstick, marker pen, etc. After the test, the samples can be evaluated according to the GB / t1766-1995 standard for the loss of light level, discoloration level, foaming level, shedding level, etc.

Pollution resistance test is usually carried out by three test methods

(1) Drip test (capping): add the pollutant to the surface of the sample and cover it with a surface plate immediately. The test time is recommended to be 24h;

(2) Drop test (without cover): the pollutants are added to the surface of the sample and exposed to the atmosphere, and the test time is recommended to be 24h;

(3) Impregnation test: immerse the sample in the pollutant, and the impregnation time shall be agreed by the supplier and the demander. The vanguard of Chinese culture