Ipdi trimer type waterborne polyurethane adhesive and preparation method thereof
A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive additives, etc., can solve the problems of mechanical properties, peel strength, poor water resistance, and low crosslinking degree, and achieve Excellent storage stability, improved mechanical properties, controllable reaction effects
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Embodiment 1
[0047] (1) Synthesis of water-based polyurethane emulsion:
[0048] Mix 18.55g polycarbonate diol and 21.46g IPDI trimer evenly, add 0.1g dibutyltin dilaurate and react at 90°C for 2 hours to obtain polyurethane prepolymer, cool down to 80°C, add 1.5g dimethylol Propionic acid and 1.5g of sodium ethylenediaminoethanesulfonate were reacted for 2 hours, heated up to 85°C, added 3.19g of methyldiethanolamine, reacted for 0.5h, and added 15ml of acetone to reduce the viscosity of the reaction system until the solution was colorless and smooth Stir. Then add 2.83g triethanolamine, react for 2h, lower the temperature to 30°C, add 2.68g triethylamine for neutralization reaction, neutralize for 1h, finally add 120g deionized water for shear emulsification, react for 1h, and remove acetone by rotary evaporation to get Water-based polyurethane emulsion.
[0049] (2) Preparation of water-based polyurethane adhesive: Add 0.35g of water-based thickener Borchi Gel LW44, 0.2g of water-base...
Embodiment 2
[0051] (1) Synthesis of water-based polyurethane emulsion:
[0052] Mix 19.16g of polyethylene adipate diol and 19.07g of IPDI trimer evenly, add 0.1g of dibutyltin dilaurate and react at 90°C for 2 hours to obtain a polyurethane prepolymer, cool down to 80°C, add 1.5g of dimethylolpropionic acid and 1.5g of sodium ethylenediaminoethanesulfonate were reacted for 2 hours, the temperature was raised to 85°C, 3.16g of dihydroxyethyl-m-toluidine was added, and 15ml of acetone was added to reduce the temperature of the reaction system. Viscosity until the solution is colorless and can be stirred smoothly. Then add 2.94g of pentaerythritol, react for 2h, cool down to 30°C, add 2.68g of triethylamine for neutralization reaction, neutralize for 1h, and finally add 120g of deionized water for shear emulsification, react for 1h, and remove acetone by rotary evaporation to obtain aqueous polyurethane emulsion.
[0053] (2) Preparation of water-based polyurethane adhesive: Add 0.35g of ...
Embodiment 3
[0055] (1) Synthesis of water-based polyurethane emulsion:
[0056] Mix 19.76g polycaprolactone diol and 16.69g IPDI trimer evenly, add 0.1g dibutyltin dilaurate and react at 90°C for 2 hours to obtain polyurethane prepolymer, cool down to 80°C, add 1.5g dimethylol Propionic acid was reacted with 1.5g sodium ethylenediamine bis-2-hydroxypropanesulfonate for 2h, the temperature was raised to 85°C, 3.07g trimethylpentanediol was added, and 0.5h was reacted, 15ml acetone was added to reduce the viscosity of the reaction system to The solution was colorless and stirred smoothly. Then add 3.12g of glycerin, react for 2h, cool down to 30°C, add 2.68g of triethylamine for neutralization reaction, neutralize for 1h, finally add 120g of deionized water for shear emulsification, react for 1h, and remove acetone by rotary evaporation to obtain aqueous polyurethane emulsion.
[0057] (2) Preparation of water-based polyurethane adhesive: Add 0.35g of water-based thickener BENAQUA 4000, 0...
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