Preparation method for 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 high curing temperature, long curing time, and lower product qualification rate of plastic coatings, and achieve high refractive index, good Fastness and aging resistance, good transparency
Active Publication Date: 2017-12-26
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-neck flask, add 1g 2-mercaptoethanol, 5g PCD1000, 1g PPG400, 2gBSA-F30 and stir evenly, vacuumize at 120°C for 1h, cool down to 50°C, add 0.02g dibutyltin dilaurate and 100g dibutyltin Toluene, then add 5.02g of XDI, keep warm at 70°C until the NCO content is 0.2%, then add 0.002g of 4-methoxyphenol, stir well, add 0.69g of hydroxyethyl methacrylate, keep warm at 70°C until the 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, 0.01gBYK-A550, 0.05g1173, and mix well to obtain an unsaturated polyurethane coating composition .
Embodiment 2
[0045] In a four-neck flask, add 1g BEPD, 2g BSA F-30, 1g PPG400, 5gPCL1000 and stir evenly, vacuumize at 120°C for 1h, cool down to 50°C, add 0.02g dibutyltin dilaurate and 100g xylene, Then add 4.98g of IPDI, keep warm at 70°C until the NCO content is 0.2%, then add 0.002g of 4-methoxyphenol, stir evenly, add 0.70g of hydroxypropyl methacrylate, keep warm at 70°C until the NCO is 0, , the measured molecular weight of the obtained product is about 13000, take 10g of the product, add 0.02g BHT, 0.01g UV531, 0.01g BYK-358N, 0.01g BYK-A550, 0.05g1173, and mix well to obtain an unsaturated polyurethane coating composition.
Embodiment 3
[0047] In a four-neck flask, add 1g CHDM, 2g BSA F-30, 1g PPG400, 5gPDA1000 and stir evenly, vacuumize at 120°C for 1h, cool down to 50°C, add 0.02g dibutyltin dilaurate and 100g xylene, Then add 3.26g of HDI, keep warm at 70°C until the NCO content is 0.2%, then add 0.002g of 4-methoxyphenol, stir evenly, add 0.70g of hydroxypropyl methacrylate, keep warm at 70°C until the 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, 0.01gBYK-A550, 0.05g1173, and mix well 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 industry, in particular to polyurethane coatings, in particular to an unsaturated polyurethane coating and a preparation method thereof. Background technique [0002] There are many kinds of plastic coatings in China, and the coatings for different plastic substrates are also different. The plastic coatings with strict transparency requirements are mainly polyurethane, and the curing temperature of this coating needs to be 120°C, 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, the transparent substrate is prone to yellowing, and at the same time increases the production cost. Contents of the invention [0003] The purpose 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 coat...
Claims
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