A kind of preparation method of unsaturated polyurethane coating
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A polyurethane coating, unsaturated technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of long curing time, low product qualification rate, high curing temperature of plastic coatings, etc., and achieve high refractive index and good transparency , good firmness and aging resistance
Active Publication Date: 2019-05-17
SHANGHAI LAIRI DIGITAL TECH CO LTD
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[0003] The object of the present invention is to provide a kind of preparation method of unsaturated type polyurethane coating, the preparation method of described this unsaturated type polyurethane coating will solve the problem that the plastic coating curing temperature in the prior art is too high and the curing time is too long Long, technical problems that lead to a reduction in the pass rate of the product
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Embodiment 1
[0043] In a four-necked flask, add 1g 2-mercaptoethanol, 5g PCD1000, 1g PPG400, 2g BSA-F30 and stir evenly, vacuumize at 120℃ for 1h, cool to 50℃, add 0.02g dibutyltin dilaurate and 100g dibutyltin Toluene, then add 5.02g of XDI, keep at 70℃ until the NCO content is 0.2%, then add 0.002g of 4-methoxyphenol, stir evenly, add 0.69g of hydroxyethyl methacrylate, keep at 70℃ until NCO is 0 , To obtain the product, the measured molecular weight is about 12000, take 10g of the product, add 0.02gBHT, 0.01g UV531, 0.01g BYK-358N, 0.01g BYK-A550, 0.05g1173, and mix uniformly to obtain an unsaturated polyurethane coating composition .
Embodiment 2
[0045] In a four-necked flask, add 1g BEPD, 2g BSA F-30, 1g PPG400, 5g PCL1000 and stir evenly, vacuumize at 120℃ for 1h, cool to 50℃, add 0.02g dibutyltin dilaurate and 100g xylene, Then add 4.98g of IPDI, keep at 70℃ until the NCO content is 0.2%, then add 0.002g of 4-methoxyphenol, stir evenly, add 0.70g of hydroxypropyl methacrylate, keep at 70℃ until NCO is 0, The obtained product has a measured molecular weight of about 13000. Take 10 g of the product, add 0.02 g BHT, 0.01 g UV531, 0.01 g BYK-358N, 0.01 g BYK-A550, 0.05 g 1173, and mix uniformly to obtain an unsaturated polyurethane coating composition.
Embodiment 3
[0047] In a four-necked flask, add 1g CHDM, 2g BSA F-30, 1g PPG400, 5g PDA1000 and stir well, vacuumize at 120℃ for 1h, cool to 50℃, add 0.02g dibutyltin dilaurate and 100g xylene, Then add 3.26g of HDI, keep at 70℃ until NCO content is 0.2%, then add 0.002g of 4-methoxyphenol, stir well, add 0.70g of hydroxypropyl methacrylate, keep at 70℃ until NCO is 0, , The product is obtained, and the measured molecular weight is about 12000. Take 10 g of the product, add 0.02 g BHT, 0.01 g UV531, 0.01 g BYK-358N, 0.01 g BYK-A550, 0.05 g 1173, and mix uniformly to obtain an unsaturated polyurethane coating composition.
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Abstract
The invention relates to a preparation method for an unsaturated polyurethane coating. Polyol is first dehydrated in advance, added with diisocyanate under the condition of adding catalyst and diluent and then heated to 60 DEG C to 80 DEG C which is kept until the NCO content is 0.1 to 0.3 percent, so that a polyurethane prepolymer is obtained, the polyurethane prepolymer is then added with polymerization inhibitor, uniformly mixed and then added with hydroxyl acrylic ester for end capping, mixing is carried out until the NCO content is zero, photoinitiator, antioxidant, ultraviolet absorber, leveling agent and defoaming agent are then added, composition is then spin-sprayed on a substrate material, and after light curing for film formation, the unsaturated polyurethane coating is obtained. The preparation method introduces the unsaturated double bond of acrylic ester into the polyurethane system, moreover, a prepolymerization method is adopted to increase the molecular weight of the resin among the coating components to 5000 to 20000, the coating is attached well to the surface of the transparent substrate by light curing, the time of coating curing is shortened, consequently, the acceptability of the finished product is increased, and the production cost is reduced.
Description
Technical field [0001] The invention relates to the field of chemical engineering, in particular to polyurethane coatings, in particular to an unsaturated polyurethane coating and a preparation method thereof. Background technique [0002] There are many types of plastic coatings in China, and the coatings for different plastic substrates are also different. For plastic coatings with strict transparency requirements, polyurethane is mainly used, and the curing temperature of this coating needs to be 120 ℃, and the curing time is as long as 2- 3 hours, too high temperature and too long curing time seriously reduce the qualified rate of finished products, transparent substrates are prone to yellowing, and at the same time increase production costs. Summary of the invention [0003] The purpose of the present invention is to provide a method for preparing an unsaturated polyurethane coating. The method for preparing the unsaturated polyurethane coating should solve the problem that t...
Claims
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Application Information
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