A preparation method of flame-retardant superfiber leather base cloth based on flame-retardant water-based polyurethane
A water-based polyurethane and microfiber leather technology, applied in textiles and papermaking, can solve the problems of easy migration and precipitation of small molecule flame retardants, and achieve the effect of reducing VOCs emissions and good flame retardant performance
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Embodiment 1
[0023] (1) Preparation of flame retardant chain extender: Dissolve 36.9g of cyanuric chloride in acetone, add 33.6g of sodium bicarbonate, then drop 12.8g of methanol, react at 20°C for 4h, and wash the obtained product , filtered, and dried; the obtained product was added to acetonitrile together with 2-amino-2methyl-1,3 propanediol, 27.9g of triethylamine was added, and reacted at 82°C for 6h, then the product was washed and filtered , and dried to obtain (4,6-dimethoxy-1,3,5-triazine)-2-methylpropane-1,3-diol.
[0024] (2) Preparation of flame-retardant water-based polyurethane: Add 60 parts of polytetrahydrofuran diol, 30 parts of 4,4'-diphenylmethane diisocyanate, and 0.01 part of bismuth laurate into the reaction vessel, and keep stirring under the protection of nitrogen atmosphere , raised the temperature to 75°C for 2 hours to prepare a prepolymer; then added 4 parts of dimethylol propionic acid and N,N - 5 parts of dimethylformamide, and maintained at 75 ° C for 2 h...
Embodiment 2
[0028] (1) Preparation of flame retardant chain extender: Dissolve 36.9g of cyanuric chloride in acetone, add 33.6g of sodium bicarbonate, then dropwise add 12.8g of methanol, react at 20°C for 4h, wash the prepared product, Filter and dry; add the obtained product together with 2-amino-2methyl-1,3 propanediol into acetonitrile, add 27.9g of triethylamine, react at 82°C for 6h, then wash the product, filter, After drying, (4,6-dimethoxy-1,3,5-triazine)-2-methylpropane-1,3-diol is obtained.
[0029] (2) Preparation of flame-retardant water-based polyurethane: Add 80 parts of polypropylene glycol, 40 parts of hexamethylene diisocyanate, and 0.01 part of bismuth laurate into the reaction vessel, and raise the temperature to 80 °C for 2.5 hour to obtain prepolymer; then add 6 parts of dimethylol butyric acid and N,N - 7.5 parts of dimethylformamide, and maintained at 80 ° C for 2.5 hours; then 25 parts of flame retardant chain extender and N,N - Add 15 parts of dimethylformami...
Embodiment 3
[0033] (1) Preparation of flame retardant chain extender: Dissolve 36.9g of cyanuric chloride in acetone, add 33.6g of sodium bicarbonate, then drop 12.8g of methanol, react at 20°C for 4h, and wash the obtained product , filtered, and dried; the obtained product was added to acetonitrile together with 2-amino-2methyl-1,3 propanediol, 27.9g of triethylamine was added, and reacted at 82°C for 6h, then the product was washed and filtered , and dried to obtain (4,6-dimethoxy-1,3,5-triazine)-2-methylpropane-1,3-diol.
[0034] (2) Preparation of flame-retardant water-based polyurethane: add 100 parts of polyethylene glycol, 50 parts of isophorone diisocyanate, and 0.01 part of bismuth laurate into the reaction vessel, and heat up to 85 °C under continuous stirring and nitrogen atmosphere protection React 3 hours and make prepolymer; Then add 8 parts of 2-[(2-aminoethyl) amino] ethanesulfonic acid sodium salts in the prepolymer of gained and N,N - 10 parts of dimethylformamide, an...
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