Polyurethane coating material and preparation method thereof
A polyurethane coating and polyurethane technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of insufficient air permeability and moisture permeability, and achieve soft hand feeling, low cost and environmental friendliness
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Embodiment 1
[0037] Preparation of polyurethane coating material:
[0038] (1) Prepare polyurethane solution:
[0039] The porogen is hydroxymethyl cellulose, and the porogen is pretreated first: after drying in an oven at 120°C for 2 hours, the viscosity is 97mPa·s, the pH is 8.5, and the degree of substitution (degree of etherification) is 0.81.
[0040] The hydroxymethylcellulose after the pretreatment of 1.770g (the mass percentage that hydroxymethylcellulose accounts for polyurethane total amount is 7.6%) is placed in the 50mL beaker, adds the DMF of 63.409g and 6.350g methyl ethyl ketone (both mass ratio 10:1) and stir evenly to obtain a mixed solution, add 0.911g of polyurethane (product model MP-285) to the mixed solution, stir with a magnetic stirrer for 20min, and carry out ultrasonic dispersion in an ultrasonic cleaner (temperature is 20°C, time 10min), the hydroxymethyl cellulose is fully dispersed to obtain a mixed solution comprising porogen and polyurethane;
[0041] The p...
Embodiment 2
[0045] Preparation of polyurethane coating material:
[0046] (1) Prepare polyurethane solution:
[0047] The porogen is hydroxymethyl cellulose, and the porogen is pretreated first: after drying in an oven at 115°C for 2.5 hours, the viscosity is 97mPa·s, the pH is 8.5, and the degree of substitution (degree of etherification) is 0.91.
[0048] The hydroxymethyl cellulose after the pretreatment of 1.014g (the mass percentage that hydroxymethyl cellulose accounts for polyurethane total amount is 3.6%) is placed in the 50mL beaker, adds the DMF of 50.94g and 51.02g butanone (both mass ratio 1:1) after stirring to obtain a mixed solution, add 2.170g of polyurethane (the product is polyether polyurethane MP-65T) into the mixed solution, stir with a magnetic stirrer for 20min, and then carry out ultrasonic dispersion in an ultrasonic cleaner ( The temperature is 20°C and the time is 10 minutes), so that the hydroxymethyl cellulose is fully dispersed to prepare a mixed solution co...
Embodiment 3
[0054] Preparation of polyurethane coating material:
[0055] (1) Prepare polyurethane solution:
[0056] The porogen is hydroxymethylcellulose, and the porogen is pretreated first: after drying in an oven at 125°C for 1.5h, the viscosity is 97mPa·s, the pH is 8.5, and the degree of substitution (degree of etherification) is 0.91.
[0057] The hydroxymethylcellulose after the pretreatment of 3.015g (the mass percentage that hydroxymethylcellulose accounts for polyurethane total amount is 15%) is placed in the 50mL beaker, adds the DMF of 42.637g and 4.263g butanone (both mass ratio 1:10) and stir evenly to obtain a mixed solution, add 1.517g of polyurethane (the product is polycarbonate polyurethane MP-30R) to the mixed solution, stir with a magnetic stirrer for 20min, and then carry out ultrasonic dispersion in an ultrasonic cleaner (Temperature is 20 DEG C, time is 10min), hydroxymethyl cellulose is fully dispersed to prepare a mixed solution containing porogen and polyuret...
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