A solvent-free polyurethane resin and its application in high peel strength waterborne/solvent-free polyurethane synthetic leather
A solvent-free polyurethane and high-peeling technology, which is applied in textiles and papermaking, etc., can solve the problems of poor bonding strength between water-based polyurethane surface layer and solvent-free polyurethane foam layer, low water-based/solvent-free peel strength, and inability to apply peel strength shoes Leather and other problems, to achieve the effect of improving poor peel strength, cross-linking density between polymers, and excellent hydrolytic aging resistance
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Embodiment 1
[0036] (1) Preparation of water-based surface layer slurry and solvent-free foam layer slurry
[0037] a) Preparation of water-based surface layer slurry (parts by weight)
[0038] The preparation process of double-bond-terminated waterborne polyurethane resin is as follows: first add 20 parts by weight of isophorone diisocyanate, 100 parts of polyhexamethylene adipate diol and 1 part of dibutyltin dilaurate catalyst in the reactor, 75 ℃ for 1~2h, add 10 parts of dimethylolpropionic acid, heat up to 85℃ and react for 2h; then cool down to 50℃, add 4 parts of pentaerythritol triacrylate and 2 parts of p-hydroxyanisole inhibitor, 60℃ React for 3 hours; finally add triethylamine at 40°C and stir for 0.5 hours, then add 250 parts of deionized water and stir for 1-2 hours to obtain a double-bond-terminated water-based polyurethane emulsion.
[0039] 100 parts of double bond-terminated water-based polyurethane, 2 parts of photoinitiator (Darocur1173), 10 parts of water-based color ...
Embodiment 2
[0048] (1) Preparation of water-based surface layer slurry and solvent-free foam layer slurry
[0049] a) Preparation of water-based surface layer slurry (parts by weight)
[0050] The preparation process of the double-bond-terminated water-based polyurethane resin is as follows: first, 25 parts of isophorone diisocyanate, 90 parts of polyhexamethylene adipate diol and 1.5 parts of dibutyltin dilaurate catalyst, pass into N 2 After reacting at 90°C for 1.5h, cool down to 75°C, add 8 parts of dimethylol propionic acid, raise the temperature to 95°C for 2 hours; then cool down to 60°C, add measured 5 parts of pentaerythritol triacrylate and 1 part of p-hydroxybenzene Methyl ether polymerization inhibitor, react at 65°C for 4h; finally add triethylamine at 45°C and stir for 0.5h, then add 250 parts of deionized water and stir at high speed for 1.5h to obtain double bond-terminated water-based polyurethane emulsion.
[0051] 100 parts of double bond-terminated water-based polyur...
Embodiment 3
[0060] (1) Preparation of water-based surface layer slurry and solvent-free foam layer slurry
[0061] a) Preparation of water-based surface layer slurry (parts by weight)
[0062] First, add 30 parts of isophorone diisocyanate, 80 parts of polyhexamethylene adipate diol and 2 parts of dibutyltin dilaurate catalyst into a four-necked flask equipped with a thermometer and an electric stirrer, and feed N 2 After reacting at 88°C for 1 hour, cool down to 75°C, add 6 parts of dimethylol propionic acid, heat up to 88°C for 2 hours; then cool down to 60°C, add measured 6 parts of pentaerythritol triacrylate and 1 part of p-hydroxybenzoic acid Ether inhibitor, react at 65°C for 4h; finally add triethylamine at 45°C and stir for 0.5h, then add 300 parts of deionized water and stir at high speed for 1h to obtain a double-bond-terminated water-based polyurethane emulsion.
[0063] 100 parts of double bond-terminated water-based polyurethane, 5 parts of photoinitiator (Darocur1173), 1 p...
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