A kind of preparation method of high-strength, high-modulus, high-elasticity polyurethane film

A polyurethane film, high-strength and high-modulus technology, which is applied in the field of film materials, can solve the problems of difficult polyurethane film and elastic decline, and achieve the effect of low cost, high controllability and widening application field

Active Publication Date: 2018-02-06
WUHAN TEXTILE UNIV
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  • Abstract
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  • Claims
  • Application Information

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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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  • A kind of preparation method of high-strength, high-modulus, high-elasticity polyurethane film

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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] a Polyurethane 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 Stir mechanically for 0.5-1 h at ℃ and then vacuum defoam to obtain a polyether-based polyurethane solution or a polyester-based polyurethane solution or a polyester-polyurethane solution with a solid content of 10-25% and a dynamic viscosity of One of the ether type 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....

Embodiment 1

[0050] a Polyurethane solution preparation

[0051] Put polyether polyurethane into N,N-dimethylformamide with a mass fraction of 98%, mechanically stir it at room temperature for 0.5 h, and then vacuum defoam to obtain 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 15g deionized water with conductivity 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 scrape it wit...

Embodiment 2

[0061] aPolyurethane solution preparation

[0062] Put the polyester polyurethane into N,N-dimethylformamide with a mass fraction of 99%, mechanically stir it for 1 h at room temperature at 18°C, and then vacuum defoam to obtain a solid content of 20% and a dynamic viscosity It is a polyester polyurethane solution of 3000mPa·s, and the stirring rate is 1200r / min.

[0063] b coagulation bath preparation

[0064] Put 60g of ammonium chloride, 8gN, 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 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 thic...

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Abstract

The invention relates to a preparation method of a high-strength, high-modulus and high-elasticity polyurethane film, and belongs to the technical field of film materials. In the method for preparing a high-strength, high-modulus, and high-elasticity polyurethane film of the present invention, a polytetrafluoroethylene plate coated with a polyurethane solution is put into a mixture of deionized water, ammonium salt, an organic solvent containing an amide bond, acetone and a low relative molecular weight. The anionic surfactant is mixed into the coagulation bath obtained by mixing the coagulation bath, and the coagulation bath is mechanically stirred, and then wet-formed and dried to obtain a high-strength, high-modulus, and high-elasticity polyurethane film. The preparation method of the invention realizes simultaneous enhancement of the breaking strength, Young's modulus and elongation at break of the polyurethane film, the breaking strength of the polyurethane film prepared by the invention increases by 270-560%, and the elongation at break increases by 80-280% , the Young's modulus increases by 50‑270%. The preparation method of the invention has simple process equipment, low cost, no pollution to the ecological environment, high controllability and 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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Patent Type & Authority Patents(China)
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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