High-strength, high-modulus, high-elastic polyurethane film preparation method
A polyurethane film, high-strength and high-modulus technology, applied in the field of film materials, can solve the problems of decreased elasticity and difficulty in realizing polyurethane film, and achieve the effect of enhancing Young's modulus, increasing breaking strength, and broadening the application field.
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[0032] A preparation method of high-strength, high-modulus and high-elastic polyurethane film, the preparation method is carried out in the following steps:
[0033] a Preparation of polyurethane solution
[0034] Put one of the polyether polyurethane or polyester polyurethane or polyester-polyether polyurethane into 98%~99% N,N-dimethylformamide at room temperature of 8-38 After mechanical stirring for 0.5-1h at ℃, vacuum degassing, a polyether polyurethane solution or polyester polyurethane solution or polyester-polyether type with a solid content of 10-25% and a dynamic viscosity of 200-18000mPa·s is obtained One of the polyurethane solutions, wherein the stirring rate is 800-3000r / min.
[0035] b Coagulation bath preparation
[0036] According to the following mass percentage:
[0037] Deionized water 15~97.5%
[0038] Ammonium salt 1~70%
[0039] 0.5~10% of polar solvent containing amide bond
[0040] Acetone 0.9~4.5%
[0041] Low relative molecular weight anionic surfactant 0.1~0.5%...
Example Embodiment
[0049] Example 1
[0050] a Preparation of polyurethane solution
[0051] Put the polyether polyurethane into N,N-dimethylformamide with a mass fraction of 98%, mechanically stir for 0.5h at room temperature of 8℃, and then vacuum defoam to obtain a solid content of 15% and a dynamic viscosity It is a polyether polyurethane solution of 200 mPa·s, in which the stirring rate is 800 r / min.
[0052] b Coagulation bath preparation
[0053] Put 70g of ammonium nitrate, 10g of formamide, 4.5g of acetone and 0.5g of sulfate ester salt surfactant with a relative molecular weight of 200 into 15g of deionized water with a conductivity of 16MΩ·cm to obtain a mixed solution, and then increase the temperature of the mixed solution The coagulation bath was obtained after 3 hours of mechanical stirring at a temperature of 25°C, and the stirring rate was 800r / min.
[0054] c Polyurethane solution coating
[0055] Pour the polyether polyurethane solution prepared in step a into a clean polytetrafluoroet...
Example Embodiment
[0060] Example 2
[0061] a Preparation of polyurethane solution
[0062] Put the polyester polyurethane into N,N-dimethylformamide with a mass fraction of 99%, mechanically stir for 1 hour at room temperature of 18℃, and then vacuum defoam to obtain a solid content of 20% and a dynamic viscosity of 3000mPa·s polyester polyurethane solution, wherein the stirring rate is 1200r / min.
[0063] b Coagulation bath preparation
[0064] Put 60g of ammonium chloride, 8g of N,N-dimethylformamide, 1.5g of acetone and 0.5g of sulfonate surfactant with a relative molecular weight of 400 into 30g of deionized water with a conductivity of 15MΩ·cm to obtain a mixed solution. Then the temperature of the mixed solution was raised to 50° C. and mechanically stirred for 4 hours to obtain a coagulation bath, where the stirring rate was 1100 r / min.
[0065] c Polyurethane solution coating
[0066] Pour the polyester polyurethane solution prepared in step a into a clean polytetrafluoroethylene board with a t...
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