Water-soluble polyurethane and cementing compound containing water-soluble polyurethane and use thereof
A polyurethane adhesive, water-based polyurethane technology, applied in the field of water-based polyurethane and water-containing polyurethane adhesive, can solve the problems of high surface tension, high solid content, high cost, etc., achieve low cost, high solid content, improve bonding strength and appearance Effect
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Embodiment 1
[0024] In a glass reactor equipped with a stirrer, a thermometer, and a reflux condenser, add 80 g of crystalline polyester diol (molecular weight: 1800), 15 g of toluene diisocyanate, and 2.3 g of dimethylol propionic acid, and heat up to 80°C , add 0.10g of dibutyltin dilaurate, react under stirring for 4 hours, then cool down to about 35°C to obtain a prepolymer, add 1.6g of triethylamine to neutralize the prepolymer into a salt, and add 50g of acetone to make the viscosity Then add 100 g of deionized water under high-speed shearing, and at the same time add 1.1 g of ethylenediamine to carry out chain extension reaction for 30 minutes, and finally raise the temperature and distill off acetone to obtain a bluish milky white internal cross-linked water-based polyurethane dispersion. Its properties are as follows: solid content: 46.1%; pH value: 6.8; viscosity (coated with -4 cups, 25°C): 16 seconds.
Embodiment 2
[0026] In the glass reactor equipped with stirrer, thermometer, reflux condenser, add crystalline polyester diol (molecular weight is 1000) 62g, diphenylmethane diisocyanate 30g, dimethylol propionic acid 2.5g, heat up to 80°C, add 0.12g dibutyltin dilaurate, react under stirring for 4 hours, then cool down to about 35°C to obtain a prepolymer, add 1.9g triethylamine to neutralize the prepolymer into a salt, and add 48g Acetone reduces the viscosity, then add 83g of deionized water under high-speed shearing, and at the same time add 2.1g of adipic acid dihydrazide to carry out the chain extension reaction for 30 minutes, and finally raise the temperature to evaporate the acetone to obtain a bluish milky white internal cross-linked water-based polyurethane Dispersions. Its properties are as follows: solid content: 49.8%; pH value: 7.5; viscosity (coated with -4 cups, 25°C): 18 seconds.
Embodiment 3
[0028] In the reactor equipped with stirrer, thermometer, reflux condenser, add amorphous polyester diol (molecular weight is 2200) 70g, toluene diisocyanate 16g, dimethylol propionic acid 2.6g, stirring is heated up to 70 ℃, add 0.11g stannous octoate, continue to react for 4 hours, cool down to about 35 ℃ to obtain prepolymer, add 2.2g triethylamine to neutralize the prepolymer into salt, and add 38g acetone to reduce the viscosity, and then Add 71 g of deionized water under high-speed shearing, add 1.7 g of diethylenetriamine, react for 1 hour, heat up and distill off acetone to obtain a bluish milky white aqueous polyurethane dispersion. Its properties are as follows: solid content: 51.8%; pH value: 7.1; viscosity (coated with -4 cups, 25°C): 19 seconds.
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