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The latest research progress of waterborne wood coatings
Time:2013年06月09日 Concerned about the number of:107

Abstract: The waterborne polyurethane and water-based acrylic coatings are described in detail. Analysis of water-based coatings research status and existing problems, put forward relevant trends and research directions.
Foreword
In the 21st century, with the further improvement of environmental regulations in order to reduce the earth for the purpose of load, low-VOC (volatile organic compounds) or zero VOC emissions become hot research and development of new paint. The development of water-based coatings are more compelling.
With environmental protection, energy awareness, water-based coatings obtained rapid development.
Waterborne Wood Coatings VOC and formaldehyde content requirements are relatively low, therefore, how to use water-based wood coating resins became critical, in other words, water-based coatings and resin formulations to anchored, while achieving excellent performance and environmental specifications. Currently on the market there are more than one hundred kinds of water-based coatings resins are available, waterborne polyurethane and acrylic emulsion is the most widely used two kinds.

1, waterborne polyurethane coatings
Waterborne polyurethane coatings for wood construction with an easy, good leveling, hard and tough coating, chemical resistance and good. Film-forming properties of waterborne polyurethane coatings can be divided according to aqueous polyurethane dispersion coatings and two-component waterborne polyurethane coatings.

1.1 aqueous polyurethane dispersion coatings
Aqueous polyurethane dispersion coating is a single component coating, resin is a thermoplastic resin used, the larger molecular weight polymer, the film does not occur during crosslinking, with the advantages of easy construction. It consists of aromatic and aliphatic polyurethane dispersion, excellent resistance to yellowing latter is more suitable for outdoors. They are good film-forming properties, high gloss coating, wear resistance, and not prone to bubbles and shrinkage. But the hardness in general, more expensive, suited to do light finish, floor paint. Compared with solvent-based polyurethane coatings, polyurethane aqueous dispersion coating film chemical resistance and solvent resistance is poor, low hardness, surface gloss is not high, and its difference from the thickening, solid content is low, the film has poor water resistance so, limits its application. Crosslinking aqueous polyurethane dispersions can improve the mechanical properties of coatings and chemical resistance properties.

First, through the selection of polyfunctional polyol, amine chain extender and a polyisocyanate crosslinking agent having a crosslinked structure and other synthetic aqueous polyurethane dispersion. Second, adding the internal crosslinking agents such as carbodiimides, aziridines, and azomethine compounds. Internal-crosslinking agent is quite stable under alkaline conditions can be stable in the polyurethane emulsion. Coating of the water during the drying process and volatile neutralizing agent, such that the pH decrease, the crosslinking reaction to proceed. The study showed that: composite modified waterborne polyurethane one-component polyurethane material can compensate defects, for example, Xu Gewen other people through the epoxy-modified polyurethane, epoxy resin high degree of branching into the polyurethane backbone, improve Emulsion coating adhesion, drying rate, film hardness and water resistance. Wang Wusheng, who used aminopropyl triethoxy silane and a polyisocyanate synthesized terminal siloxane prepolymer, and then dispersed in water, depending siloxane cross - linked hydrolyzed condensate prepared aqueous dispersion of crosslinked polyurethane.

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