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Scientists have studied in detail the effects of exposure conditions on dirt resistance of external wall coatings.
over time, color change is a common cause of dissatisfaction with many of the world's exterior building (decorative) coatings. Therefore, this is an active area of research interest for the manufacturers of these coatings and their raw material suppliers
. The rate of color change in any particular coating depends on the interaction between certain physical properties of the coating and environmental exposure conditions. This interaction can be established by exposing a range of coatings to a variety of real-world environmental conditions.
In a new paper,
scientists report dirt resistance (DPR) results from 26 commercial exterior coatings exposed in four different locations, as well as the results of subsequent studies of 10 commercial coatings at two exposure locations. The repeatability and repeatability of these tests is determined by repeating the same two coatings at different exposure locations and on different dates. The researchers believe this is the first time such information has been reported.
repetition within the series is good, but the repeatability between series is poor, emphasizing that only the performance of coatings exposed at the same time and in the same location needs to be compared.
in addition to testing dirt absorption, they also studied the extent to which microbial growth can lead to color changes and found a strong correlation between mold infestion and L-decrease under conditions conducive to mold growth.
, they studied how much panel orientation affects how much film brightness decreases over time, and found that the change in L-s depends in part on orientation, and that the early results towards the south are long-term results of accurate predictive indicators tested in the vertical direction of the paint.
the findings have been published in the Journal of Coating Technology and Research Volume 17 (2020).
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