罩面清漆耐沾污性测试方法对测试结果的影响及原因分析  

Analysis of the Cause and Influence of DPUR Test Methods on DPUR Test Results of Varnish

作　　者：芮英宇 RUI Ying-yu(Nippon Paint(China)Co.,Ltd.,Shanghai 201201,China)

机构地区：[1]立邦涂料(中国)有限公司,上海201201

出　　处：《中国涂料》2024年第3期30-38,共9页China Coatings

摘　　要：当前罩面清漆耐沾污性测试方法涉及HG/T 5065—2016和GB/T 9780—2013两个标准,其中存在两个主要问题经常引发测试结果争议。第一个问题是由于疏水型罩面清漆的疏水特性导致HG/T 5065—2016中耐沾污性试验的涂刷过程均匀与涂刷结果均匀的分离现象,而对HG/T 5065—2016引用GB/T 9780—2013耐沾污性试验方法中“均匀涂刷”这一表述的理解差异导致又产生了两种涂刷方法:本实验将保证涂刷过程均匀,不强求涂刷结果均匀的涂刷方法称为“自然刷”;将保证涂刷过程和涂刷结果都均匀的涂刷方法称为“刻意刷”。通过实验设计考察并分析了疏水型罩面清漆耐沾污性试验过程中的三要素:涂刷时间、配制灰溶液损耗量和样板增重,发现“刻意刷”涂刷方法实际与GB/T 9780—2013中相关规定相悖离,“自然刷”的涂刷方法是符合标准各项规定的正确方法,才能依据HG/T 5065—2016标准正确评估疏水型罩面清漆的耐沾污性。第二个问题是HG/T 5065—2016中在罩面清漆耐沾污性测试中引入了白色涂料,但是对白色涂料没有具体的规定。通过实验设计考察了白色涂料相关的三要素:白色涂料的明度、白色涂料的制板方法和白色涂料的养护时间。结果表明,白色涂料的制板方法对罩面清漆的耐沾污性没有明显影响;白色涂料若未充分干燥会导致罩面清漆耐沾污性下降,而经过充足的养护时间干燥后该现象消失;白色涂料的明度对非疏水型罩面清漆耐沾污性没有显著影响,但对疏水型罩面清漆耐沾污性的计算结果产生明显影响。建议HG/T 5065后续修订时应对白色涂料作出进一步的规定以避免白色涂料差异导致罩面清漆耐沾污性测试结果的争议。The current test method for the DPUR of varnish involves two standards:HG/T 5065—2016 and GB/T 9780—2013.There are two main problems that often cause disputes over the test results.The first one is that because of the hydrophobic characteristics of the hydrophobic varnish,the“uniformity”of brushing process of the DPUR test in HG/T 5065—2016 is separated from the brushing result,and the difference in understanding of the expression“uniform brushing”in GB/T 9780—2013 cited in HG/T 5065—2016 has led to two brushing methods.This test operation that the brushing process must be uniform and the results do not have to be uniform is called“natural brushing method”;the test operation that ensures the process and result of brushing method are uniform is called"deliberate brushing method".Through the experimental design,the three key points in the DPUR test of the hydrophobic varnish were investigated and analyzed:the brushing time,the loss of the experiment solution and the weight gain of the test panels.It was found that the“deliberate brushing method”is actually contrary to the relevant regulations in GB/T 9780—2013,and the“natural brushing method”is the suitable test operation thatmeets the requirements of the standard.The DPUR results of the hydrophobic varnish can be correctly evaluated in accordance with the HG/T 5065—2016 standard by the“natural brushing method”.The second problem is that according to HG/T 5065—2016 standard,white coatings are introduced in the DPUR test of varnish.However,there are no specific regulations for these white coatings.Through the experimental design,the three key points of the white coatings used in the DPUR test of the varnish were investigated:the brightness of the white coatings,the application method and the curing time of the white coatings.It is found that the application method has no effect on the DPUR results of varnish;the DPUR results of varnish will degrade until the curing time of white coatings is enough;the brightness of the white c

关 键 词：疏水型 罩面清漆 耐沾污性 测试方法 

分 类 号：TQ630.72[化学工程—精细化工]