The effect of surface texture and other factors on the specular gloss of flatted lacquer films
Abstract
It is a well known fact that the incorporation of so-called flatting agents into clear finishes results in lowered specular gloss readings. This study proposes to explain the effect produced by such agents in producing surface texture with subsequent flatting, and to statistically evaluate the percentage of specular gloss which can be attributed directly to the production of this surface texture by the agents in question. It was found that 79% of a given specular gloss reading can be directly attributed to the surface texture or roughness of the finish involved when the silica type flatting agents are used, and that 66% of the gloss can be explained by surface texture when the stearate type agents are used. This leads to the conclusion that surface roughness is a prime prerequisite of flatting, but that some other factor, peculiar to the flatting agent under test, is also responsible to a lesser degree for the specular gloss reading finally obtained. Other conditions have been investigated and statistically evaluated for these two types of agent, and these include work on ideal conditions for grinding each type of agent, in regard to percentage of agent to be used in the grind mix, and the effect of aging of flatted lacquers on their flatting ability.
Degree
Ph.D.
Subject Area
Mechanical engineering
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