Preparation of Shellac Resin Microcapsules Coated with Urea Formaldehyde Resin and Properties of Waterborne Paint Films for Tilia amurensis Rupr.

Abstract

A two-step in situ polymerization method was utilized to fabricate urea formaldehyde (UF) resin-coated shellac resin microcapsules. The morphology and composition of microcapsules with different core-wall ratios were analyzed by scanning electron microscope (SEM) and infrared (IR) spectrum. The effects of different concentrations of microcapsules on gloss, color difference, hardness, adhesion, and impact resistance of waterborne paint films were studied. At the same time, the self-healing effect of the prepared microcapsules applied to waterborne paint film was discussed. The results revealed that the shellac resin microcapsules coated with UF resin were successfully prepared. At the 0.67:1 and 0.75:1 core-wall ratios, the color differences of the paint film with 0–20.0% (weight percent) microcapsules were small and the color was uniform. Under the condition of 60° incident angle and the same microcapsule concentration, a good gloss was obtained. When the concentration was 20.0%, the hardness of paint film reached the maximum value. The adhesion of paint film was better, which was not affected by microcapsule concentration. When the concentration was 5.0% and 10.0%, the microstructure of paint film was good. The paint film with a 10.0% concentration of the shellac resin microcapsules coated with UF resin had better self-healing performance and the comprehensive performance was better. This paper provides the basis for the industrial application of self-healing waterborne wood paint films.

Effect of Water-Based Acrylic Acid Microcapsules on the Properties of Paint Film for Furniture Surface

“…Microencapsulation is a kind of packaging technology that can store and protect the core material for a long time, and release the core material when needed. Self-repairing microcapsules release the core material to repair cracks when they appear [1][2][3]. Jeong et al [4] prepared nifedipine-loaded poly(lactic acid) (PLA)/polyethylene glycol (PEG) microcapsules by solvent evaporation method, and the effects of PLA and PEG on the drug release behavior of microcapsules were studied.…”

Effect of Microcapsules with Waterborne Coating as Core Material on Properties of Coating for Tilia Europaea and Comparison with Other Microcapsules

“…The performances of the waterborne coatings with the same content, the same wall material and different core materials reported in the literature were compared and analyzed [ 32 , 33 , 34 ]. In Table 10 , the optimal mass ratio of core to shell with waterborne coating microcapsules was 0.67:1, that of waterborne acrylic acid microcapsules was 0.58:1, that of epoxy resin microcapsules was 0.83:1, and that of shellac microcapsules was 0.75:1.…”

“…According to the relevant literature, when the mass fraction of epoxy resin microcapsule, shellac microcapsule, and waterborne acrylic acid microcapsule in waterborne coating is 10.0%, the coating performance is better [ 32 , 33 , 34 ]. Therefore, in order to carry out the subsequent comparative analysis, the optimized mass ratio of core to shell of 0.67:1 waterborne coating microcapsules were added to the waterborne coating with a mass fraction of 0 and 10.0%, respectively, and stirred evenly.…”

“…Then, the prepared microcapsules were added to waterborne coating to explore the effect of the self-healing microcapsules on the coating properties. On this basis, the coating properties of microcapsules were compared with those of other microcapsules with different core materials reported in the literature [ 32 , 33 , 34 ]. The main objective of the research is to explore the influence of different core materials on the coating and obtain better self-healing effect, so as to provide the basis for the application of self-healing microcapsules in wood materials in the future.…”

Preparation and Performance of Thermochromic and Self-Repairing Dual Function Paint Film with Lac Resin Microcapsules and Fluorane Microcapsules

“…Fluorane dyes in fluorane microcapsules have the advantages of low discoloration temperature, high sensitivity, and stable discoloration performance, which can realize the thermochromism between yellow and colorless and meet the requirements of wood discoloration. Lac resin dissolved in ethanol can be used as a core material of microcapsules to repair cracks at room temperature [19][20][21]. With the seasonal change of indoor temperature, the surface of wood products will automatically change color.…”