Abstract
Methods for the synthesis of urethane acrylates used as new crosslinking agents for hydrophobic UV-curable powder clear coatings were developed. In the synthesis of urethane acrylates, isophorone diisocyanate, glycerin, xylitol, polyethylene glycol and polysiloxane KF-6000, as well as 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate, were used. In order to increase the functionality of urethane acrylates, glycerin and xylitol derived from renewable sources were introduced. The chemical structure of the urethane acrylates was verified by IR spectroscopy. UV-curable powder clear coatings were obtained through a combination of urethane acrylates with unsaturated polyester resins. The thermal behavior and crosslinking density were examined using DMA. The obtained coatings were evaluated by performing the following tests: roughness, gloss, scratch resistance, hardness, adhesion to steel and water contact angle. As part of this research, high hydrophobicity and scratch resistance of UV-curable powder clear coatings were developed, which are a VOC-free and economically attractive alternative method for low thermal resistance surface protection, such as for composites, wood and wood-based materials.
Highlights
Recent years have shown a growing interest in ecological, environmentally friendly coatings which will still offer various functionalities, and meet consumers’ requirements in furniture, civil engineering and anti-corrosion applications
The crosslinking agents were named after the first letters of the names of the substrates, e.g., IGKFX/HEA means a PIC made from isophorone diisocyanate (IPDI), glycerin, KF-6000, xylitol combined with 2-hydroxyethyl acrylate; IGKFX/HEMA means a PIC made of IPDI, glycerin, KF-6000, xylitol combined with 2-hydroxyethyl methacrylate
This work presents a method for the preparation of urethane acrylates as crosslinking agents for UV-curable hydrophobic powder coatings
Summary
Recent years have shown a growing interest in ecological, environmentally friendly coatings which will still offer various functionalities, and meet consumers’ requirements in furniture, civil engineering and anti-corrosion applications. Research has shown that VOC emissions from powder coatings are in the range of 0.4–3.0% depending on the chemical composition of the resin [1]. With the passing of time, changes and requirements in this area, a lot of research has been carried out on powder coatings for heat-sensitive substrates such as MDF (Medium-density fibreboard), wood panels or plastic [3,4,5,6,7]. For this purpose, one possibility is to use UV light. Due to advantages such as high curing speed and good mechanical properties of the crosslinked coatings, ultraviolet (UV) curing has become a fast and environmentally friendly curing technique [7,8,9,10]
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