Method for preparing cowhair keratin modified polyurethane coating agent
A polyurethane and keratin technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as affecting the feeling of the dermis, and achieve the effect of reducing excessive plasticity and good compatibility
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example 1
[0019] (1) Weigh 10g of pretreated cow hair, put it in a 250ml three-neck flask, add 60mL of 0.5 mol / L NaOH solution, put it in a constant temperature water bath at 90°C, stir for 1 h, add alkaline protease 0.2 g, 0.32g of 2-phosphonic acid butane-1,2,4-tricarboxylic acid sodium salt 0.32g and 0.5g of cyanuric chloride, stirred and reacted for 1 h at 35°C, and filtered with a Buchner funnel after the reaction was completed to obtain the lower layer Liquid A, spare;
[0020] (2) In a 500ml four-necked flask equipped with a stirring blade, a thermometer, and a condenser tube, in the presence of a catalyst of 0.21 g of dibutyltin dilaurate, 60 g of polytetrahydrofuran ether glycol and 9.99 g of isophorone diisocyanate were mixed. g mixed, and reacted at 85°C for 2 hours to obtain 70g of polyurethane prepolymer A;
[0021] (3) Add dimethylol propionic acid 2.94g and acetone solvent 8.4g in polyurethane prepolymer A, react 1.5h under the condition of 65 ℃, add triethylamine 4.2g a...
example 2
[0023] (1) Weigh 10 g of pretreated cow hair, put it in a three-necked bottle, add 60 mL of 0.5 mol / L NaOH solution, put it in a constant temperature water bath at 90°C, stir for 1 h, add alkaline Protease 0.2g, 2-phosphonic acid butane-1,2,4-tricarboxylic acid sodium salt 0.32g and cyanuric chloride 0.5g, stirred at 35°C for 1 h, and filtered with a Buchner funnel after the reaction was completed. Get the lower layer liquid A,
[0024] (2) In a 500ml four-necked flask equipped with a stirring blade, a thermometer, and a condenser tube, under the condition that dibutyltin dilaurate 0.54g is a catalyst, polytetrahydrofuran ether glycol 60g and isophorone diisocyanate 30g Mix and react at 95°C for 4 hours to obtain polyurethane prepolymer A90g;
[0025] (3) Add dimethylolbutyric acid 6.4g and acetone solvent 22.5g in polyurethane prepolymer A, react 3.5h under the condition of 85 ℃, add triethylamine 7.2g and carry out neutralization reaction 50min, add step (1 ) The resulting...
example 3
[0027] (1) Weigh 10 g of pretreated cow hair, put it in a three-necked bottle, add 60 mL of 0.5 mol / L NaOH solution, put it in a constant temperature water bath at 90 ° C, stir for 1 h, add alkaline protease 0.2g, 0.32g of 2-phosphonic acid butane-1,2,4-tricarboxylic acid sodium salt 0.32g and 0.5g of cyanuric chloride, stirred and reacted for 1 h at 35°C, and filtered with a Buchner funnel after the reaction was completed to obtain The lower liquid A.
[0028] (2) In a 500ml four-neck flask equipped with a stirring blade, a thermometer, and a condenser tube, under the condition that dibutyltin dilaurate 0.36g catalyst exists, polytetrahydrofuran ether glycol 60g and isophorone diisocyanate 20g Mix and react at 90°C for 3 hours to obtain 80g of polyurethane prepolymer A;
[0029] (3) Add 4.6 g of dimethylol propionic acid and 14.8 g of polyurethane prepolymer A to the acetone solvent in the polyurethane prepolymer A, react for 2.5 h at 75° C., add 5.6 g of triethylamine to ca...
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