Aqueous urethane resin compositions
A urethane and water-based resin technology, applied in the fields of water-based urethane resin compositions and 1-component water-based coating compositions, can solve the problems of insufficient flexibility and complicated manufacturing.
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Synthetic example 1
[0079] Synthesis Example 1: Synthesis of Acrylate Polyol Without Chain Transfer Agent
[0080] Put 40 parts of N-methylpyrrolidone in the flask, stir while blowing nitrogen at 150°C, drop 15 parts of styrene, 13 parts of isobutyl methacrylate, and 30 parts of 2-ethylhexyl acrylate over 4 hours. 20 parts of diacetone acrylamide, 17 parts of 2-hydroxyethyl methacrylate, 5 parts of acrylic acid, and 4 parts of PERHEXYL D (manufactured by NOF Corporation, trade name, peroxide radical polymerization initiator) , after the dropping was finished, it was left at 150°C for 1 hour, and then a mixed solution of 0.5 parts of 2,2'-azobisisobutyronitrile and 3 parts of N-methylpyrrolidone was added dropwise for 30 minutes. It was left to stand at °C for 1 hour to obtain an acrylate polyol solution (AP-1) with a solid content of 70%. The number average molecular weight of the obtained acrylate polyol was 1,730, the acid value was 39 mgKOH / g, and the hydroxyl value was 73 mgKOH / g. The calcu...
Synthetic example 2
[0082] Except having mixed the monomer shown in following Table 1, and having made reaction temperature 130 degreeC, it carried out similarly to the synthesis example 1, and obtained the acrylate polyol solution (AP-7) of 70% of solid content. The number average molecular weight, acid value, hydroxyl value, and the calculated number of hydroxyl groups per molecule of the obtained acrylate polyol are shown in Table 2 below.
Synthetic example 3
[0083] Synthesis Example 3: Synthesis of methacrylate dimer with hydroxyl groups
[0084] The used methacrylates and solvents were degassed (deoxygenated) by bubbling nitrogen gas therein for at least 1 hour before use.
[0085]Put 30 parts of xylene and 25 parts of ethyl acetate in a reaction vessel equipped with a thermometer, a thermostat, a stirrer, a reflux condenser, a nitrogen inlet pipe and a dripping device, and heat to At 105°C, 100 parts of hydroxypropyl methacrylate, 0.05 parts of bis(borondifluorodimethylglyoxylic acid) Co(II) as a metal complex, and 2 , a mixture of 1 part of 2'-azobis(2-methylbutyronitrile) and 15 parts of ethyl acetate as an additional solvent. After the dropping, let it stand at 105°C for 1 hour, then add 0.5 parts of 2,2'-azobis(2-methylbutyronitrile) and 12 parts of xylene dropwise for another 1 hour, and put it under 105°C after the dropping. It was left to stand for 1 hour to obtain an oligomer solution (55% of solid content) of hydroxyp...
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