Polyurethane resin for synthetic leather with high water pressure resistance
A polyurethane resin and polyester diol technology, which is applied in the field of polyurethane resin for high water pressure resistant synthetic leather, can solve the problems of low water pressure resistance, increased consumption of raw materials, poor hand feeling, etc., and achieve excellent water pressure resistance and excellent water resistance Effect
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[0026] Example 1
[0027] A polyurethane resin for synthetic leather with high water pressure resistance is prepared from the following raw materials:
[0028]
[0029] This polyurethane resin adopts the preparation method of the following steps to make:
[0030] 1) Dissolve 120Kg of polyneopentyl adipate diol with a molecular weight of 2000, 120Kg of polytetrahydrofuran ether diol with a molecular weight of 1000 and 5Kg of ethylene glycol melted into a liquid state in 267Kg of N,N-dimethyl In the mixed solution of formamide and 200Kg of toluene, stir evenly at 70°C and keep warm for 15 minutes;
[0031] 2) Add 65Kg of 4,4'-diphenylmethane diisocyanate and keep at 70℃ for 2 hours;
[0032] 3) Add 0.01Kg organic bismuth catalyst to gradually increase the viscosity of the system;
[0033] 4) After the viscosity of the system reaches 300Pa.s, add a mixture of 133Kg N,N-dimethylformamide and 100Kg toluene, and then add 0.1Kg methanol;
[0034] 5) Cool down to 60°C, keep sti...
Example Embodiment
[0035] Embodiment 2
[0036] A polyurethane resin for synthetic leather with high water pressure resistance is prepared from the following raw materials:
[0037]
[0038] This polyurethane resin adopts the preparation method of the following steps to make:
[0039] 1) Melt 60Kg of poly(neopentyl adipate) diol with a molecular weight of 1000, 40Kg of poly(methyltrimethylene adipate) diol with a molecular weight of 1000, 100Kg of polypropylene glycol with a molecular weight of 2000 and 10Kg of ethylene glycol was dissolved in a mixture of 267Kg of N,N-dimethylformamide and 180Kg of methyl ethyl ketone, stirred evenly at 75°C, and kept for 15 minutes;
[0040] 2) Add 78Kg of 4,4'-diphenylmethane diisocyanate and keep at 75℃ for 2 hours;
[0041] 3) Add 0.03Kg organic bismuth catalyst to gradually increase the viscosity of the system;
[0042] 4) After the viscosity of the system reaches 350Pa.s, add a mixture of 133Kg N,N-dimethylformamide and 90Kg methyl ethyl ketone, and...
Example Embodiment
[0044] Embodiment 3
[0045] A polyurethane resin for synthetic leather with high water pressure resistance is prepared from the following raw materials:
[0046]
[0047] This polyurethane resin adopts the preparation method of the following steps to make:
[0048] 1) Melt 60Kg of polybutylene adipate diol with a molecular weight of 2000, 20Kg of polybutylene adipate diol with a molecular weight of 2000, and 40Kg of polytetrahydrofuran ether with a molecular weight of 2000 that have been melted into a liquid state Diol, 40Kg of polypropylene glycol with a molecular weight of 2000 and 15Kg of ethylene glycol are dissolved in a mixed solution of 200Kg of N,N-dimethylformamide, 133Kg of methyl ethyl ketone and 67Kg of toluene, stirred evenly at 80°C, and incubated for 15 minutes;
[0049] 2) Add 80Kg of 4,4'-diphenylmethane diisocyanate and keep at 80℃ for 2 hours;
[0050] 3) Add 0.05Kg of organic bismuth catalyst to gradually increase the viscosity of the system;
[0051...
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