Abstract
This paper reports on a novel, film-forming acrylic polymer resin that exhibits low-gloss surface and high transparency via controlling film morphology at sub-micron roughness levels. Such microstructure is controlled by means of the copolymerization process increasing the allyl methacrylate (AMA) crosslinker content from 0 to 0.4 wt %. This acrylic resin makes it possible to avoid high loadings of matting agents, while also having good abrasion resistance and soft-touch feeling. Gloss levels of as low as 4 units at 60° incident angle and light transmittance of up to 85% have been achieved. The chemical structure of the aqueous acrylic resin was characterized by ATR-FTIR and NMR spectroscopy. The film morphology and surface roughness were measured by SEM and AFM analysis. The emulsion particle morphology and glass transition temperature were obtained by TEM and DSC, respectively. The effects of the crosslinker content on the light transmittance, glass transition temperature, and thermal degradation stability were also discussed in detail. The characterization results conclude that an acrylic polymer with interesting optical properties and high thermal stability can be obtained, which is desirable for leather applications.
Highlights
Coating systems and processes which give a substrate a uniform and matt surface are of considerable interest
When the system temperature was heated to 70 ◦ C, the first group of 20% Butyl acrylate (BA)/allyl methacrylate (AMA) mixed monomers were dropwise added to the system for emulsifying about 40 min
It is notable that vinyl-monomers, including the AMA
Summary
Coating systems and processes which give a substrate a uniform and matt surface are of considerable interest. When extremely low gloss levels are demanded, use of such high levels of hard dulling agents would have the problem that they could not always be adequately wetted and surrounded by liquid-based resin, or in other words, they could not be restrained into a uniform and continuous film. In such cases, the mechanical properties of the liquid-based coating would be impaired [20]. The effects of the crosslinker AMA content on the glass transition temperature, film transmittance, and thermal degradation stability are discussed in detail
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