UV-cured polyurethane modified acrylate adhesive preparation method
A polyurethane acrylate and acrylate technology is applied in the preparation field of UV curing polyurethane modified acrylate adhesive, which can solve the problems of large haze and weak adhesion, achieve low haze, increase adhesion, easy-to-control effects
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[0029] The invention provides a method for preparing a UV-cured polyurethane-modified acrylate adhesive, comprising the following steps:
[0030] A) under the action of an organotin catalyst, the isocyanate shown in formula I is reacted with hydroxyethyl acrylate shown in formula II to obtain the intermediate shown in formula III;
[0031] B) add polymerization inhibitor in the intermediate shown in formula III, then react with polyether polyol, obtain the urethane acrylate prepolymer shown in formula IV;
[0032] C) mixing polythiol with the urethane acrylate prepolymer shown in the formula IV, adding a photoinitiator to react to obtain a UV-curable urethane-modified acrylate adhesive;
[0033] NCO-R 2 -NCO formula I;
[0034]
[0035]
[0036] Among them, R 1 and R 2 Independently selected from C1~C10 straight-chain alkyl, branched-chain alkyl, substituted aryl or unsubstituted aryl, the isocyanate is preferably selected from 4,4-dicyclohexylmethane diisocyanate, i...
Embodiment 1
[0054] First, add 0.3mol of isophorone diisocyanate into a three-neck flask with a condenser and agitator, heat it in a constant temperature water bath to 35°C, then add 0.0002mol of dibutyltin dilaurate, and then use a constant pressure funnel drop by drop Add 0.32 mol of hydroxyethyl methacrylate, control the rate of addition, finish dropping within 40 minutes, and continue to react for 2 hours; then raise the temperature to 60°C, add 0.002 mol of hydroquinone into the flask, and then add dehydrated 0.1 mol of polyoxypropylene triol is controlled to be added dropwise within 40 minutes, the temperature is controlled at 60°C and the reaction is continued for 3 hours, the temperature is lowered and the material is discharged to obtain polyurethane acrylate.
[0055] Mix 0.15mol of the obtained urethane acrylate prepolymer with 0.5molg of 2,3-dithio(2-mercapto)-1-propanethiol and stir for 0.5h to make it evenly mixed, then add 0.002mol of photoinitiator TPO Raise the temperature...
Embodiment 2
[0057] First, add 0.3mol of toluene diisocyanate into a three-necked flask with a condenser tube and a stirrer, heat it in a constant temperature water bath to 32°C, then add 0.0002mol of dibutyltin dilaurate, and then add 0.32mol dropwise with a constant pressure funnel hydroxyethyl methacrylate, control the dropping speed, finish dropping within 40min, and continue to react for 2.5h; then raise the temperature to 60°C, add 0.002mol hydroquinone into the flask, and then dropwise add 0.1mol dehydrated poly The dropwise addition of oxypropylene triol is controlled within 40 minutes, the temperature is controlled at 60°C and the reaction is continued for 3 hours, the temperature is lowered and the material is discharged to obtain polyurethane acrylate.
[0058] Mix 0.15mol of the obtained urethane acrylate prepolymer with 0.375mol of pentaerythritol tetrakis (2-mercaptoacetate) and stir for 0.5h to make it evenly mixed, then add 0.002mol of photoinitiator TPO and raise the temper...
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