A kind of two-component water-based polyurethane adhesive for synthetic leather and preparation method thereof
A water-based polyurethane, two-component technology, applied in the field of synthetic leather, can solve the problems of adhesive line strength, long post-curing time, and long drying time of adhesive resin, etc., to achieve shortened production cycle, high peel strength, excellent The effect of initial tack
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Embodiment 1
[0052] To prepare component A, the formula is as follows:
[0053]
[0054] Preparation method of component A: Add 100g of polybutylene adipate diol with a number average molecular weight of 2000 and a hydroxyl value of 56mg KOH / g into a three-necked flask at 110°C for 2 hours of vacuum dehydration, then cool down to 50°C , add 47.42g of toluene diisocyanate, react at 80-90°C for 2h; then cool down to 60°C, add 33.39g of diluting solvent acetone, and add 17.17g of 1,6-hexanediol and 0.03g of dibutyltin dilaurate, keeping at 60 ℃ for 1 h to obtain a prepolymer with terminal -NCO groups; then cool down to room temperature, add 79.25 g of acetone, stir evenly, add 12.02 g of 50% sodium ethylenediamine sulfonate aqueous solution, keep 40 ~ React at 50°C for 10 minutes to obtain a sulfonate polyurethane prepolymer; then slowly add 3.95g of methyl ethyl ketone oxime dropwise and keep it at 40-50°C for 1 hour to obtain a partially blocked sulfonate polyurethane prepolymer; then st...
Embodiment 2
[0057] To prepare component A, the formula is as follows:
[0058]
[0059] Preparation method of component A: Add 100g of polybutylene adipate diol with a number average molecular weight of 2000 and a hydroxyl value of 56mg KOH / g into a three-necked flask at 110°C for 2 hours of vacuum dehydration, then cool down to 50°C , add 47.42g of toluene diisocyanate, react at 80-90°C for 2h; then cool down to 60°C, add 33.39g of diluting solvent acetone, and add 17.17g of 1,6-hexanediol and 0.03g of dibutyltin dilaurate to keep the prepolymerization The mixture was reacted at 60°C for 1 h to obtain a prepolymer with terminal -NCO groups; then cooled to room temperature, 80.83 g of acetone was added, and after stirring evenly, 12.02 g of a 50% mass fraction of sodium ethylenediaminoethanesulfonate aqueous solution was added, Keep the reaction at 40-50°C for 10 minutes to obtain a sulfonate polyurethane prepolymer; then slowly add 6.33g of methyl ethyl ketone oxime dropwise and keep ...
Embodiment 3
[0062] To prepare component A, the formula is as follows:
[0063]
[0064] Preparation method of component A: Add 100g of polybutylene adipate diol with a number average molecular weight of 2000 and a hydroxyl value of 56mg KOH / g into a three-necked flask at 110°C for 2 hours of vacuum dehydration, then cool down to 50°C , add 43.47g of toluene diisocyanate, react at 80-90°C for 2h; then cool down to 60°C, add 32.61g of diluting solvent acetone, and add 17.17g of 1,6-hexanediol and 0.03g of dibutyltin dilaurate to keep the prepolymerization The mixture was reacted at 60°C for 1 h to obtain a prepolymer with terminal -NCO groups; then cooled to room temperature, 72.26 g of acetone was added, and after stirring evenly, 12.02 g of a 50% mass fraction of sodium ethylenediaminoethanesulfonate aqueous solution was added, Keep the reaction at 40-50°C for 10 minutes to obtain a sulfonate polyurethane prepolymer; then slowly add 1.98g of methyl ethyl ketone oxime dropwise and keep ...
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