Abstract
A waterborne thermochromic primer film containing thermochromic reversible microcapsules on the surface of Tilia europaea was prepared. The influences of different microcapsule concentrations on the reversible thermochromic, optical, mechanical and liquid resistance properties of the primer films were investigated. Not only were the morphology and structure of microcapsules and films observed, but also the chemical compositions of the microcapsules and films were analyzed. The results showed that for the primer film with microcapsules, the microcapsule concentration had a more significant influence on color difference. The primer film with microcapsules can achieve thermochromic reversibility. The temperature of color change was 32 °C and it had a good color recovery. The film gloss was negatively correlated with the microcapsule concentration, and the film with 5.0%–15.0% concentration had the best gloss. Adding an appropriate concentration of microcapsules can effectively improve the mechanical properties of the film. The film with 0–15.0% microcapsules had better liquid resistance to detergent, i.e., grade 1. The bonding form between the primer film added with microcapsules and Tilia europaea was physical bonding. This study provides a technical reference for the development of modern intelligent discoloration wood products.
Highlights
Microcapsules are a kind of micro container with core-shell structures, composed of dispersed solid, liquid or gas coated with film-forming materials [1]
That is, when the microcapsule is raised to a specific temperature, it can convert from its original color to another, and return to the original color with a drop in temperature [8]
The surface of microcapsules was smooth and dense, and there was no agglomeration between microcapsules
Summary
Microcapsules are a kind of micro container with core-shell structures, composed of dispersed solid, liquid or gas coated with film-forming materials [1]. The functionalization of microcapsules can be realized by coating different kinds of core materials [2]. Microcapsule technology is widely used in biomedicine [3], agriculture [4] and architecture [5]. As a kind of functional microcapsule, thermochromic reversible microcapsules have gradually become the focus of attention [6]. Thermochromic reversible microcapsules are a kind of material with intelligent response, which can change color with the ambient temperature changing [7]. That is, when the microcapsule is raised to a specific temperature, it can convert from its original color to another, and return to the original color with a drop in temperature [8]
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