Waterborne polyurethane dispersion and one-component waterborne adhesive for pvc calendered coating including it
A water-based adhesive, water-based polyurethane technology, applied in textiles and papermaking, etc., can solve the problems of reducing service life, residue, and smell.
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Embodiment 1
[0044] Add 240g of dehydrated poly(1,4-butylene adipate) (molecular weight: 3000), 50g of TDI-80, 20g of HMDI, 36.5g of acetone, and an appropriate amount of catalyst (bismuth isooctanoate, 100ppm) to the nitrogen inlet and outlet. In a 1 L four-neck round bottom flask, the mixture was stirred at 60-80° C. until NCO reached 6.8%. Add 8g of 1,4-butanediol, 14g of dimethylolpropionic acid and 80g of acetone and continue the reaction at 60°C until NCO reaches 1.70. Then add 200g of acetone to dilute and cool down to 40°C, add 9.51g of triethylamine to neutralize for 10 minutes, add 503g of water under high-speed stirring to stir and disperse, add 3.0g of ethylenediamine to continue stirring for 15 minutes. After separating the acetone from the obtained acetone-containing emulsion by distillation, a solvent-free aqueous polyurethane dispersion with a particle size of 45 nm was obtained.
[0045] Take 100 parts of the obtained water-based polyurethane and add it into the dispersio...
Embodiment 2
[0047] Add 240g of dehydrated poly-1,4-butylene adipate (molecular weight: 2000), 50g of TDI-80, 35g of HMDI, 36.6g of acetone, and an appropriate amount of catalyst (bismuth isooctanoate, 100ppm) into the nitrogen inlet and outlet. In a 1 L four-neck round bottom flask, the mixture was stirred at 60-80° C. until NCO reached 6.99%. Add 8g of 1,4-butanediol, 15g of dimethylolpropionic acid and 80g of acetone and continue the reaction at 60°C until the NCO reaches 1.81. Then add 210g of acetone to dilute and cool down to 40°C, add 10.2g of triethylamine to neutralize for 10min, add 503g of water under high-speed stirring to stir and disperse, add 4.2g of ethylenediamine to continue stirring for 15min. After separating the acetone from the obtained acetone-containing emulsion by distillation, a solvent-free aqueous polyurethane dispersion with a particle size of 50 nm was obtained.
[0048] Take 100 parts of the obtained water-based polyurethane and add it into the dispersion ta...
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