Synthesis process of novel water-based polyurethane light-cured resin

Abstract

The invention discloses a synthesis process of novel water-based polyurethane (PU) light-cured resin. The synthesis process comprises the following steps: 1) synthesizing a high-rigidity and water emulsifiable light-cured pre-polymer PU1 containing a multifunctional group; 2) synthesizing a water-based polyurethane light-cured pre-polymer PU2 containing carbamate; mixing the two pre-polymers PU1 and PU2 at different ratios to form a pre-polymer which takes the PU1 as a core and the PU2 as a shell, so as to realize molecule-graded fusion; adding triethylamine to neutralize ion groups; adding water and emulsifying to form water-based polyurethane light-cured resin with different rigidity. By adopting the synthesis process disclosed by the invention, the disadvantages of toxin, volatility and the like of a traditional light-cured paint active diluting agent are overcome; the problem that a lot of solvents need to be added into a synthesis phase of common water-based light-cured resin is solved. By adjusting the ratio of the PU1 to the PU2, the resin with relatively high rigidity is prepared and applied to floor paint, the resin with moderate rigidity is applied to furniture paint and the soft resin is applied to synthetic leather; the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to a water-based polyurethane light-curing resin, in particular to a synthesis process of a novel water-based polyurethane light-curing resin, and belongs to the application field of water-based polyurethane coatings. Background technique [0002] In the early 1960s, German Bayer Company took the lead in developing light-curing coatings, which were applied in the wood coating industry. Because its technology conforms to the concepts of environmental protection, energy saving, and clean production, it has attracted increasing attention. After more than 40 years, light-curing coatings have developed rapidly and have been widely used in many industries. [0003] Traditional UV-curable coatings are composed of three parts: photoinitiator, reactive oligomer, and reactive diluent. The reactive diluent has a diluting effect, adjusts the viscosity and rheology of the main component reactive oligomer, and participates in light The curing ...

AI Technical Summary

Problems solved by technology

Water-based light-curing coatings have a low viscosity in water-dispersed systems. Unlike traditional light-curing systems, a large amount of reactive diluents are added to reduce the viscosity of the system to meet construction requirements. However, in order to obtain a coating film with sufficient mechanical strength, synthetic The molecular weight of the resin must be large enough, which will inevitably cause a large amount of solvent to be added during the synthesis stage of the prepolymer because the viscosity is high. After the prepolymer is dispersed in water to form an emulsion, a large amount of organic solvent is removed by distillation under reduced pressure, thus increasing Reduce production costs, reduce production efficiency, and generate certain VOC; in addition, even if the synthesized resin has a sufficiently high molecular weight, as a floor paint, its strength is still different from that of traditional light-cured floor paint in terms of strength and wear resistance.