Wet high-stripping polyurethane resin and preparation method thereof
A polyurethane resin, high peeling technology, applied in the field of polyurethane synthetic leather, can solve the problems of high residual DMF content on the leather surface, poor washing, slow vehicle speed, etc., and achieve the effects of improving regularity and cohesion, reducing energy consumption and improving regularity.
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Embodiment 1
[0053] (1) Add 400g of polyol compound PET-2 and 3g of antioxidant I-1010 into 1000g of solvent DMF;
[0054] (2) Stir the solution in (1) evenly, add 66g of diisocyanate, and react at 75°C for 2h in the presence of 0.8g of catalyst organic bismuth Mb20;
[0055] (3) Add 10g of ethylene glycol and 20g of MDA to (2), stir and react at 85°C for 0.5h; then add 400g of polyol compound PET-3, stir evenly, add 40g of diisocyanate, and carry out pre-treatment at 75°C Polymerization reaction 3h obtains prepolymer;
[0056] (4) Add 1400g of solvent DMF, 114g of ethylene glycol, and 460g of diisocyanate to the prepolymer. After stirring evenly, continue the reaction at 75°C for 5h; after the reaction is completed, add reaction terminator methanol to control its viscosity at 210Pas / 25 ℃ to obtain polyurethane resin.
[0057]
Embodiment 2
[0059] (1) Add 400g of polyol compound PET-3 and 2g of antioxidant 2246 into 1000g of solvent DMAC;
[0060] (2) Stir the solution in (1) evenly, add 100g of diisocyanate, and react at 80°C for 1.5h in the presence of 4g of catalyst organic bismuth Mb20;
[0061] (3) Add 12g of 1,4-butanediol and 18g of MDA to (2), stir and react at 80°C for 0.7h; then add 400g of polyol compound PET-2, stir evenly, add 50g of diisocyanate, The prepolymerization reaction was carried out at ℃ for 2.5h to obtain the prepolymer;
[0062] (4) Add 1400g of solvent DMF, 120g of 1,4-butanediol, and 500g of diisocyanate to the prepolymer. After stirring evenly, continue to react at 80°C for 4 hours; Control at 200Pas / 25°C to obtain polyurethane resin.
Embodiment 3
[0064] (1) Add 400g of polyol compound PET-2, 1g of antioxidant I-1010, and 2g of antioxidant 2246 into 1000g of solvent DMAC;
[0065] (2) Stir the solution in (1) evenly, add 135g of diisocyanate, and react at 75-85°C for 1-2h in the presence of 1.6g of catalyst organic bismuth Mb20;
[0066] (3) Add 15g of ethylene glycol and 24g of MOCA to (2), stir and react at 75°C for 0.9h; then add 400g of polyol compound PET-2, stir evenly, add 70g of diisocyanate, and carry out pre-treatment at 85°C Polymerization reaction 2h obtains prepolymer;
[0067] (4) Add 1400g of solvent DMF, 110g of ethylene glycol, and 440g of diisocyanate to the prepolymer. After stirring evenly, continue the reaction at 85°C for 3h; after the reaction is completed, add reaction terminator methanol to control its viscosity at 160Pas / 25 ℃ to obtain polyurethane resin.
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