Polyurethane resin for high-density shoe leather and preparation method thereof
A high-density, wet-process polyurethane technology, used in textiles and papermaking, etc., can solve the problems of slow solidification speed of coating slurry, low solid content of impregnating material, and difference in solidification speed, etc. Penetration, the effect of reducing the difference in penetration speed
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Embodiment 1
[0024] Raw material name Weight (kg)
[0025] Polytetrahydrofuran oxide ethylene copolymer glycol (number average molecular weight 2000) 920
[0026] Polyoxypropylene diol (number average molecular weight 3000) 1380
[0027] MDI (diphenylmethane-4,4`-diisocyanate) 953.63
[0028] EG (ethylene glycol) 179.46
[0029] Antioxidant TPP 5.1
[0030] Catalyst (bismuth carboxylate) 0.051
[0031] DMF (N, N-dimethylformamide) 6664.25
Embodiment 2
[0033] Raw material name Weight (kg)
[0034] Polytetrahydrofuran oxide ethylene copolymer glycol (number average molecular weight 1000) 1125
[0035] Polyoxypropylene diol (number average molecular weight 2000) 1125
[0036] MDI (diphenylmethane-4,4`-diisocyanate) 989.68
[0037] BG (1,4 butanediol) 204.4
[0038] Antioxidant TPP 5.1
[0039] Catalyst (bismuth carboxylate) 0.051
[0040] DMF (N, N-dimethylformamide) 6685.59
Embodiment 3
[0042] Raw material name Weight (kg)
[0043] Polytetrahydrofuran oxide ethylene copolymer glycol (number average molecular weight 2000) 920
[0044] Polyoxypropylene diol (number average molecular weight 3000) 1380
[0045] MDI (phenylmethane-4,4`-diisocyanate) 1006.35
[0046] EG (ethylene glycol) 144.4
[0047] 1,6-HG (1,6-hexanediol) 208.26
[0048] Antioxidant TPP 5.2
[0049] Catalyst (bismuth carboxylate) 0.052
[0050] DMF (N, N-dimethylformamide) 6876.35
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