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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.

Active Publication Date: 2015-12-02
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The method for enhancing the tensile mechanical properties of the polyurethane film is designed and implemented from the aspects of molecular structure, intermolecular force, aggregation state and adding reinforcements. It is a process of modifying the polyurethane film into a rigid film. The rigidity of the polyurethane film An increase will lead to a decrease in its elasticity
Therefore, the above-mentioned method of enhancing the tensile mechanical properties of polyurethane film can only effectively realize the increase of its breaking strength and Young's modulus, but it is difficult to realize the three mechanical indexes of polyurethane film in terms of breaking strength, Young's modulus and elongation at break. purpose of increasing

Method used

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Examples

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preparation example Construction

[0032] A preparation method of high-strength, high-modulus and high-elasticity polyurethane film, described preparation method is carried out according to the following steps:

[0033] aPolyurethane solution preparation

[0034] Put one of polyether polyurethane or polyester polyurethane or polyester-polyether polyurethane into N,N-dimethylformamide with a mass fraction of 98% to 99%, and the room temperature is 8-38 Mechanical stirring at ℃ for 0.5-1h and vacuum defoaming to obtain a polyether polyurethane solution or polyester polyurethane solution or polyester-polyether polyurethane solution with a solid content of 10-25% and a dynamic viscosity of 200-18000mPa·s 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] Polar solvent containing amide bond 0.5~10%

[0040] Acetone 0.9~4.5...

Embodiment 1

[0050] aPolyurethane solution preparation

[0051] Put polyether polyurethane into N,N-dimethylformamide with a mass fraction of 98%, mechanically stir it at room temperature at 8°C for 0.5h, and then vacuum defoam to obtain a solid content of 15%, dynamic viscosity It is a polyether polyurethane solution at 200mPa·s, and the stirring speed is 800r / min.

[0052] b coagulation bath preparation

[0053] 70g ammonium nitrate, 10g formamide, 4.5g acetone and 0.5g relative molecular weight are put into the 15g deionized water that conductivity is 16MΩ cm to obtain mixed solution, then the temperature of mixed solution is raised After heating to 25°C and stirring mechanically for 3 hours, a coagulation bath was obtained, wherein the stirring rate was 800 r / min.

[0054] c Polyurethane solution scraping

[0055] Pour the polyether polyurethane solution prepared in step a into a clean polytetrafluoroethylene board with a thickness of 0.5mm, a length of 1.5m and a width of 0.7m, and...

Embodiment 2

[0061] aPolyurethane solution preparation

[0062] Put polyester polyurethane into N,N-dimethylformamide with a mass fraction of 99%, stir it mechanically at room temperature for 1 hour 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] 60g of ammonium chloride, 8gN,N-dimethylformamide, 1.5g of acetone and 0.5g of sulfonate surfactant with a relative molecular weight of 400 were put into 30g of deionized water with a conductivity of 15MΩ·cm to obtain a mixed solution, Then the temperature of the mixed solution was increased to 50° C. and mechanically stirred for 4 hours to obtain a coagulation bath, wherein the stirring rate was 1100 r / min.

[0065] c Polyurethane solution scraping

[0066] Pour the polyester polyurethane solution prepared in step a into a clean polytetrafluoroethylene plate with a thickness of 1...

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Abstract

The present invention relates to a high-strength, high-modulus, high-elastic polyurethane film preparation method, and belongs to the technical field of film material. The preparation method for the high-strength, high-modulus, high-elastic polyurethane film provided by the invention comprises: putting a polytetrafluoroethylene plate blade coating with a polyurethane solution into coagulating bath mixed by deionized water, ammonium salt, amide linkage-containing organic solvent, acetone, and anionic surfactant with a low relative molecular weight, mechanically stirring the coagulating bath, and carrying out wet forming and drying to obtain the high-strength, high-modulus, high-elastic polyurethane film. The preparation method provided by the invention can enhance breaking strength, Young's modulus and elongation at break of the polyurethane film simultaneously. The breaking strength of the polyurethane film is enhanced by 270-560%, elongation at break is enhanced by 80-280%, and the Young's modulus is enhanced by 50-270%. The preparation method provided by the invention is simple in processing equipment, low in cost, and pollution-free to ecological environment, high in controllability, and has a great application prospect.

Description

technical field [0001] The invention relates to a preparation method of a high-strength, high-modulus and high-elasticity polyurethane film, belonging to the technical field of film materials. Background technique [0002] Polyurethane is mainly formed by the polyaddition reaction of diisocyanate or polyisocyanate with dihydroxy or polyhydroxy compounds. It has excellent properties such as high elasticity, wear resistance, low temperature resistance, solvent resistance and aging resistance, so it is widely used in various fields of national economy. Due to the good solubility of polyurethane materials in N,N-dimethylformamide, N,N-dimethylacetamide and dimethyl sulfoxide, polyurethane can be prepared by wet spinning method to prepare polyurethane film, widely used Wide range of applications in leather, sofas, shoes and hats, automotive interiors, decorations, tracks and other fields. [0003] With the expansion of the application field of polyurethane film, people put forw...

Claims

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Application Information

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IPC IPC(8): C08J9/00C08J5/18C08L75/08C08L75/06C08K3/28C08K3/16C08K3/30C08K3/26C08K3/32
Inventor 刘欣徐卫林王栋唐运容曹根阳李文斌张科杨锴
Owner WUHAN TEXTILE UNIV
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