Epoxy modified polyurethane, UV-curing coat and preparation method thereof
An epoxy modified and cured coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor mechanical properties of coatings, and achieve the effect of strong bonding force and good mechanical properties
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[0073] In the preparation method of the ultraviolet curable coating of the present invention, the main resin, the diluent and the photoinitiator can be mixed once or step by step. In a preferred situation, first mix the photoinitiator with part of the diluent to fully dissolve the photoinitiator to obtain a solution containing the photoinitiator; then mix the main resin with another part of the diluent evenly to obtain a resin component slurry; then The solution containing the photoinitiator is mixed evenly with the slurry containing the resin component, and finally the remaining solvent is added and mixed evenly. The above mixing is usually carried out at normal temperature, and if necessary, it can be slightly heated to 30-60°C to speed up the mixing.
[0074] When the UV-curable coating disclosed by the present invention contains unmodified polysiloxane and / or epoxy-modified polysiloxane, the order of adding each component is not required. Oxane and / or epoxy-modified polys...
Embodiment 1
[0086] This example is used to illustrate the UV-curable coating disclosed in the present invention and its preparation method.
[0087] 1. Preparation of epoxy-modified polyurethane
[0088] In a 500ml three-necked flask, add 8 parts by weight of propylene glycol and 150ml of N-methylpyrrolidone as a reaction solvent, and after the above reactants are completely dissolved, add 0.2 parts by weight of DBTL (dibutyltin dilaurate), dropwise at 25°C 24 parts by weight of 2,4-toluene diisocyanate, reacted for 3 hours, when the isocyanate content of the detection system remained constant, 4 parts by weight of cyclohexene-3-methanol was added to the system, and 0.1 parts by weight of DBTL ( Dibutyltin dilaurate) was reacted at 30°C for 3 hours. When the isocyanate content of the detection system remains unchanged again, 0.3 parts by weight of peracetic acid is added to the system, and the reaction is catalyzed at 50° C. for 2 hours. When the epoxy equivalent of the detection system ...
Embodiment 2
[0093] This example is used to illustrate the UV-curable coating disclosed in the present invention and its preparation method.
[0094] 1. Preparation of epoxy-modified polyurethane
[0095] In a 500ml three-necked flask, add 8 parts by weight of polyethylene glycol (molecular weight 200) and 150ml of N-methylpyrrolidone as a reaction solvent. After the above reactants are completely dissolved, add 0.2 parts by weight of DBTL (dibutyltin dilaurate) , add 13 parts by weight of isophorone diisocyanate dropwise at 40°C, react for 3 hours, when the isocyanate content of the detection system remains unchanged, add 1.5 parts by weight of cyclohexene-3-methanol to the system, and supplement 0.1 parts by weight of DBTL (dibutyltin dilaurate) was reacted at 40° C. for 2 hours. When the isocyanate content of the detection system remains unchanged, add 0.3 parts by weight of peracetic acid to the system, and catalyze the reaction at 50° C. for 2 hours. When the epoxy equivalent of the ...
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