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A kind of polymer composite film, its preparation method and application

A polymer film and composite film technology, which is applied in the field of polymer film materials and composite materials, can solve the problems of attenuation of film mechanical properties, large film specificity, poor UV shielding function of polymer films, etc., and achieve the rate of change in tensile strength Small, small amount of increase, excellent effect of UV shielding function

Active Publication Date: 2019-07-23
中科应化(长春)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two polymer films have obvious and insurmountable disadvantages, that is, the inorganic light shielding agent or organic UV absorber is blended with the polymer by the blending method, so that the polymer on the surface layer of the material is still exposed to Under the direct irradiation of ultraviolet light, aging degradation will still occur quickly on the surface of the material and gradually develop to the inside, resulting in poor ultraviolet light shielding function of the polymer film
At the same time, for polymer films containing polymers and organic UV absorbers, since the organic UV absorbers are mostly small molecules, as the use time increases, the organic UV absorbers will migrate and gradually lose during processing and use. Phenomenon, migration and loss make the attenuation of ultraviolet absorption function more serious, and the function of ultraviolet light shielding is significantly reduced
And for the polymer film that comprises polymer and inorganic light-shielding agent, because the agglomeration of inorganic particle or the difference of compatibility with polymer, the mechanical property attenuation of this film is very serious; And the specific gravity of inorganic light-shielding agent Large, so that the specific gravity of the final film is relatively large, which is not conducive to the application in the aviation field with strict requirements on the weight of the film, such as airship skin protection layer, etc.

Method used

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  • A kind of polymer composite film, its preparation method and application
  • A kind of polymer composite film, its preparation method and application
  • A kind of polymer composite film, its preparation method and application

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preparation example Construction

[0025] The present invention provides a method for preparing the above polymer composite film, which includes the following steps:

[0026] The dopamine solution is subjected to self-polymerization reaction on the surface of the polymer film to form a polydopamine layer with a thickness of ≥100 nm to obtain the polymer composite film.

[0027] Specifically, the polymer film is immersed in the prepared dopamine solution, and the dopamine self-polymerizes on the surface of the polymer film to form a polydopamine layer. When the thickness is not less than 100 nm, the resulting composite film is the polymer composite film.

[0028] The dopamine solution is a mixed solution of dopamine and a buffer. In the dopamine solution, the concentration of dopamine is 1 mg / mL-10 mg / mL, preferably 1 mg / mL-5 mg / mL.

[0029] The present invention has no particular limitation on the above-mentioned buffer, as long as the buffer is well known to those skilled in the art, it is used to adjust the pH of the...

Embodiment 1

[0038] The polyvinylidene fluoride film was immersed in a mixed solution of dopamine and Tris-HCl buffer to react, and the concentration of dopamine was controlled to 2mg / mL, the pH of the mixed solution was 8.5, and the reaction temperature was 30°C. After the polydopamine layer was formed, The obtained composite film is dried in an oven in an air atmosphere at a temperature of 80°C and a drying time of 10 minutes to obtain a polymer composite film. The thickness of the final formed polydopamine layer is measured by the ellipsometer It is 150nm.

[0039] After obtaining the polymer composite film, use an ultraviolet spectrophotometer to detect the ultraviolet transmittance of the polymer composite film, see figure 1 . The results show that at the wavelength of 200nm-400nm, with the increase of the wavelength, the overall ultraviolet light transmittance shows an upward trend. The ultraviolet light transmittance at 250nm is obviously less than 0.1%, and reaches the maximum value o...

Embodiment 2

[0042] The polyvinylidene fluoride film was immersed in a mixed solution of dopamine and Tris-HCl buffer to react, and the concentration of dopamine was controlled to be 3 mg / mL, the pH of the mixed solution was 8.5, and the reaction temperature was 35°C. After the polydopamine layer was formed, The obtained composite film is dried in an oven in an air atmosphere at a temperature of 80°C and a drying time of 10 minutes to obtain a polymer composite film. The thickness of the final formed polydopamine layer is measured by the ellipsometer It is 100nm.

[0043] After the polymer composite film is obtained, the ultraviolet transmittance of the polymer composite film is detected by an ultraviolet spectrophotometer. The results show that at a wavelength of 200nm to 400nm, as the wavelength increases, the overall ultraviolet transmittance is An upward trend, reaching a maximum of 0.56% at 400nm.

[0044] At the same time, the weight increase and tensile strength change rate of the polym...

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Abstract

The invention provides a polymer composite film which comprises a polymer film layer and a polydopamine layer. The thickness of the polydopamine layer is greater than or equal to 100nm. Simple reaction is carried out under mild conditions to establish the polydopamine layer on different polymer film surfaces, so that the finally obtained polymer composite film has excellent ultraviolet light shielding function. The mechanical properties of the polymer film can not be negatively influenced; and since the polydopamine layer is very thin, the finally obtained composite film has small specific gravity increment and is very suitable for the aviation application field, such as airship bag material surface protective layers and the like.

Description

Technical field [0001] The invention relates to the field of polymer film materials and composite materials, in particular to a polymer composite film, its preparation method and application. Background technique [0002] When the polymer material is exposed outdoors, the chromophore in the polymer will be excited by absorbing sunlight (mainly ultraviolet light) to generate free radicals, and under the action of oxygen, the polymer will undergo photooxidative degradation. This process will cause the polymer material to turn yellow, become brittle, and eventually lose its use efficiency. Especially for polymer films, whose thickness is usually less than 100 μm, the phenomenon of photodegradation leading to a reduction in the service life of the film material is more significant. [0003] The traditional method to improve the resistance of polymer materials to photoaging is to combine polymers with inorganic light shielding agents (TiO 2 , ZnO) blending to obtain a polymer film conta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/16C08L27/16C08L75/04C08L23/06C08L23/12C08L27/06
CPCC08J5/18C08J7/16C08J2323/06C08J2323/12C08J2327/06C08J2327/16C08J2375/04C08L2201/08C08L2203/16
Inventor 熊征蓉杨宇明李同兵董莉盛德鲲刘向东孙磊张航
Owner 中科应化(长春)科技有限公司
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