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Brief introduction to the synthesis of epoxy resin modified waterborne polyurethane
Release time:
2018-09-11
Waterborne polyurethane is a type of polymer material with excellent physical properties, mechanical properties, weather resistance, environmental friendliness, and other advantages. With the development of society and the progress of the times, it has been gradually applied in various fields such as coatings, home decoration, and inks. However, due to limitations in its synthesis methods, the performance of waterborne polyurethane is still inferior to that of oil-based polyurethane in certain aspects. In order to improve the comprehensive performance of waterborne polyurethane, more and more researchers are engaged in the modification of waterborne polyurethane resins. Currently, the main modification methods include: 1. Improving monomers and synthesis processes; 2. Adding auxiliaries; 3. Crosslinking; 4. Composites. Waterborne polyurethane
Waterborne polyurethane is a type of polymer material with excellent physical properties, mechanical properties, weather resistance, and environmental friendliness. With the development of society and the progress of the times, it has been gradually applied in various fields such as coatings, home decoration, and inks. However, due to limitations in its synthesis methods, the performance of waterborne polyurethane is still inferior to that of oil-based polyurethane in certain aspects. In order to improve the comprehensive performance of waterborne polyurethane, more and more researchers are devoted to the modification of waterborne polyurethane resin. Currently, the main modification methods include:
1. Improving monomers and synthesis processes; 2. Adding auxiliaries; 3. Crosslinking; 4. Composites.
Waterborne Polyurethane
The optimization and compounding of waterborne polyurethane mainly include epoxy resin modification, polyorganosiloxane modification, and acrylic composite modification. The following will briefly introduce epoxy resin modified waterborne polyurethane.
Epoxy resin itself has the characteristics of high mechanical strength, good adhesion, good chemical stability, and low cost, and has been widely used in industry. However, it also has some disadvantages, such as poor toughness, brittleness after curing, and low impact resistance, which limit its application fields. Combining polyurethane with high elasticity and high bonding force with epoxy resin can obtain epoxy-modified polyurethane with excellent properties.
There are three main methods for modifying waterborne polyurethane with epoxy resin:
1. Mechanical blending, which is to mix epoxy resin and waterborne polyurethane at a certain ratio;
2. Graft copolymerization of epoxy resin and polyurethane: After graft copolymerization of epoxy resin and polyurethane prepolymer, water emulsification is used to obtain epoxy resin-modified waterborne polyurethane;
3. Ring-opening of epoxy resin into polyurethane: The ring-opened epoxy resin is introduced into the polyurethane prepolymer as a polyol component.
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