请教：大家对自清洁外墙涂料有什么个人见解？

william

补充一些英文资料供大家参考：
Differenc approaches to dirt pickup resistance:

the easiest way to achieve good dirt pickup resistance is to raise the glass transition temperature (Tg) of the coating, essentially creating a harder finish faster. there are multiple downsides to this approach. first, it is nonviable in elastomeric application, such as white roof coatings, that require elongation and flexibility. the second downside associated is that increase Tg typically requires higher VOC content in the final coating formulation when compared to formulations utilizing lower Tg coatings. this is in direct opposition to the decrease in VOCs required of paint formulators by government regulaitions.

william

using highly crosslinked polymers, resulting in a low-tack surface that impedes dirt penetration. while this method is commonly used in automotive coating application, architectural and elastomeric coatings provide unique challenges, due to the need to retain elongation, making it less viable.

william

increasing the pigment volume concentration (pvc) is another method of creating a harder surface and increasing dirt pickup resistance by reducing the amount of polymer on the surface of the final coating. however, increasing the PVC significantly past the critical pigment volume concentration produces the opposite effect. more pores result and dirt pickup becomes even more of a problem.

william

Using higher levels of organic opacifiers results in a harder surface with increased hydrophobicity. while dirt pickup resistance is improved, the harder coating makes this method ineffective in elastomeric applications.

william

Photo-catalytic degradation agents are not commonly used becase, even though they have been effective in reducing dirt pickup, they can potentially degrade the latex binder as well, reducing the life of the coating.

Multi-staged polymers represent a fairly new technology that involves a mixture of polymers with different Tg ranges, resulting in a mix of hard and soft segments. to date, however, this technology has not yet to overcome many of the same issues faced by formulators,  specifically elongation properties, especially after heat treatment.

william

Hydrophobic coating techonoly is one of the most promising approaches to dirt pickup resistance. The downside is that coating utilizing hydrophobic materials tend to streak easily.

富丽龙

期待真正符合中国环境的自洁涂料问世。

guangxingu

自洁是广大从事建筑涂料的工程师最求的目标，配方难度很大。国内环境污染严重，国外好的涂料到国内使用，情况并不理想。从目前来看，BASF的Col.9值得关注，但还没有在国内应用的实例，该成膜物质采用纳米与有机高分子相结合的亲水涂层的路线，比较符合我国的情况，主要还是要看实际是使用效果。

Nirvana

Hydrophobic coating techonoly is one of the most promising approaches to dirt pickup resistance. The downside is that coating utilizing hydrophobic materials tend to streak easily.
william 发表于 2009-5-27 11:53

另外一方面， 国内的dirt亲油性比较多一些，漆膜表面疏水的话，也容易同性相惜

Nirvana

自洁是广大从事建筑涂料的工程师最求的目标，配方难度很大。国内环境污染严重，国外好的涂料到国内使用，情况并不理想。从目前来看，BASF的Col.9值得关注，但还没有在国内应用的实例，该成膜物质采用纳米与有机高分子 ...
guangxingu 发表于 2009-5-29 09:14

原来的SKK怎样了

guangxingu

好久没有做建筑涂料了，SKK宣传的亲水性，但不知最近如何。我认为对建筑涂料来讲，是适应国情的。其实早期的硅溶胶涂料表面耐污性还是不错的，缺点是漆膜不致密，容易出现吸入性污染。

coobe

油性漆，固特异树脂，微粉化，就是自清洁。

lgy

疏水表面没办法抗雨痕的，我们公司自己测试的自洁效果最好的是微粉化，但耐久性要考虑，疏水表面在室外暴晒一段时间后是最脏的，亲水表面抗雨痕是最好的，我们自己做的墙面（立面）三年后一点雨痕都看不见的，但亲水性能要两个月以后才会有，真正的自清洁只有从陶瓷涂料上面想办法了，有机的要考虑自洁又要考虑耐久目前来说是很难的

心似狂想

低的表面能，但是使用疏水剂时间长了也是麻烦的

qing

路过........

delu

我们公司和中科院联合开发的Permanano系列外墙自清洁涂料，主要是采用了纳米氧化钛的复合材料。效果非常显著。这个产品在3年前就获得了大公司的商业应用，已是一个成熟的商业化产品。成本约为RMB2/平方米，施工十分方便快捷，施工成本几乎可以忽略不计。

Permanano在乳胶漆，质感涂料，金属漆表面均有出色的表现。除了自清洁功能，还提供以下性能：
1 保色
2 延长使用寿命
3 净化空气

有兴趣的朋友可以随时和我交流，谢谢。

阳光灿烂

http://finance.sina.com.cn/roll/20090707/21226451924.shtml
这个上央视了，跟你们的有什么区别呢？他们的价格倒是不便宜，80元/平米。

delu

我们的原料成本约为RMB 2-3/KG，施工成本几乎可以忽略（一个人1天可以施工数千平方）。效果需要您自行验证，我说再多不如您亲身体验。

央视那个我也听说了，这种噱头为主的节目不看也罢...原理倒是类似。我们的性价比要高的多，是市场可以接受的成本。

landream

学习ing。。。。。。

hynmgman

可以加纳米助剂达到一点的荷叶效应，但问题是施工的要求非常苛刻，基层必须是一样的表面张力，否则就会有非常差的表观，从而以影响性能，
另外纯亲油的效果在雨天没有效果，现在趋向亲水的基团的研究