Effect of MF-Coated Epoxy Resin Microcapsules on Properties of Waterborne Wood Coating on Basswood

Abstract

In this paper, melamine–formaldehyde (MF) was used as the wall material, and epoxy resin was used as the core material to prepare microcapsules. The optical properties, mechanical properties and ageing resistance of waterborne topcoat were investigated by adding different mass fractions of microcapsules into the waterborne topcoat. Through scanning electron microscopy and infrared spectroscopy analysis, the prepared microcapsules of core-wall ratio of 0.50 were more uniform. It was found that when the mass fraction of microcapsules is less than 10.0% and the core–wall ratio is 0.50, the original color difference of the coating can be maintained. With the increase in microcapsule mass fraction, the gloss of the topcoat film gradually decreases. The mass fraction of the microcapsule of 4.0% with the core–wall ratio of 0.50 can maintain the original gloss of 30.0 GU. The topcoat film with the MF-coated epoxy resin microcapsules of the core–wall ratio of 0.50 has high impact resistance, adhesion and hardness. The results showed that the gloss loss and color difference of the coating with the MF-coated epoxy microcapsules were the lowest when the mass fraction of microcapsules was 4.0%, indicating that microcapsules can improve the stability of coating. These results lay a technical foundation for the development and application of high-performance wood coatings.

Coating Process Optimization and Self-Healing Performance Evaluation of Shellac Microcapsules Coated with Melamine/Rice Husk Powder

“…Keeping it at 20 • C for reaction for 3 h, the solution was placed in a beaker for 7 d. The product was filtered after 7 d and washed with the ethanol solution and distilled water, respectively. After filtration, the product was dried in the oven for 4 h at 60 • C to obtain light yellow fluffy powder as a microcapsule sample [31].…”

Effects of Shellac Self-Repairing and Carbonyl Iron Powder Microcapsules on the Properties of Dulux Waterborne Coatings on Wood

“…Figure 9 shows the infrared spectra of single factor 3′ # and 4′ # microcapsules, from which it can be seen that the triazine ring bending vibration absorption peak appears at 809 cm −1 , and the -NH-stretching vibration peak appears at 1547 cm −1 , representing the characteristic peak of melamine resin, while the characteristic peak of CIP appears at 3394 cm −1 and 1444 cm −1 , which indicates that the core material and the wall material have not undergone chemical reaction, and that the microcapsules have been successfully prepared [34,35].…”

New Progress in the Application of Flame-Retardant Modified Epoxy Resins and Fire-Retardant Coatings

“…EP is one of the most important binders in common coatings used in human production and life [108]. Generally, EP cross-links under the action of an amine curing agent to form a coating with high strength, high resistance to impact [109], and high chemical resistance, but the EP coating system also has defects such as easy combustion and poor toughness. Therefore, in order to improve upon the above problems, the existing solutions mainly include two aspects: on the one hand, starting from the molecular structure, the molecular structure of the monomer or curing agent can be optimized, and functional molecular chains at the end of the chain, such as a toughened polyurethane chain and flame-retardant silicone chain, can be inserted.…”