High-gloss water-base polyurethane resin for synthetic leather and preparation method of high-gloss water-base polyurethane resin
A water-based polyurethane and high-gloss technology, which is applied in the field of polyurethane resin materials, can solve environmental pollution and other problems, and achieve the effects of high gloss, smooth surface and simple preparation method
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Embodiment 1
[0026] High-gloss water-based polyurethane resin for synthetic leather, made of the following components: 230g polyphthalate-diethylene glycol (Mn=3000), 120g castor oil, 32g dimethylolpropane acid (DMPA), 2.8g trimethylolpropane (TMP), 116g toluene diisocyanate (TDI).
[0027] Its preparation method:
[0028] Mix 230g polyphthalate-diethylene glycol ester diol (Mn=3000), 120g castor oil, 32g dimethylolpropionic acid (DMPA), 2.8g trimethylolpropane (TMP) and 116g Add toluene diisocyanate (TDI) into the reactor and mix well. After reacting at 85° C. for 3 hours, the temperature was lowered to 55° C., and 500 g of acetone was added for dilution. Stir evenly, and when the temperature continues to drop to 20°C, add 24.1g of triethylamine for neutralization. Stir evenly, transfer to emulsification equipment, and when the temperature continues to drop to 15°C, add 500g of 15°C distilled water and shear at high speed to obtain a nearly transparent emulsion. 3.9 g of ethylenediami...
Embodiment 2
[0030] High-gloss water-based polyurethane resin for synthetic leather, made of the following components: 230g polyadipate-terephthalate-diethylene glycol (Mn=2000), 79g castor oil, 38.1g Dimethylolpropionic acid (DMPA), 152g toluene diisocyanate (TDI).
[0031] Its preparation method:
[0032] Mix 230g of polyadipate-terephthalate-diethylene glycol (Mn=2000), 79g of castor oil, 38.1g of dimethylolpropionic acid (DMPA) and 152g of toluene diisocyanate (TDI) Add to the reactor and mix well. After reacting at 85° C. for 2.5 hours, the temperature was lowered to 55° C., and 350 g of acetone was added for dilution. Stir evenly, and when the temperature continues to drop to 20°C, add 28.8g of triethylamine for neutralization. Stir evenly, transfer to emulsification equipment, and when the temperature continues to drop to 15°C, add 750g of 15°C distilled water and shear at high speed to obtain a transparent emulsion. 9.2 g of ethylenediamine was added and the chain was post-exte...
Embodiment 3
[0034] High-gloss water-based polyurethane resin for synthetic leather, made of the following components by weight: 40 parts of castor oil, 10 parts of toluene diisocyanate, 1 part of 2,2-dimethylol propionic acid, 0.5 parts of ethylene glycol, three 0.5 parts of ethylamine, 40 parts of water.
[0035] Its preparation method comprises the following steps:
[0036] (1) Preparation of prepolymer: mix long-chain polyol, aromatic or aliphatic diisocyanate, anionic hydrophilic compound and low molecular weight compound containing hydroxyl or amino groups, and react at a constant temperature of 70°C for 5 hours to obtain a prepolymer:
[0037] (2) Dilute and neutralize: cool the prepolymer to 10°C, add 100% of the mass of the prepolymer with acetone and butanone to dilute, and add an ion neutralizer for neutralization to obtain a neutralized mixture;
[0038] (3) Emulsification with water: add water to emulsify the neutralized mixture to obtain a water emulsion;
[0039] (4) Solve...
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