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Polyvinyl alcohol casting solution, polyvinyl alcohol film and preparation method and application thereof

A technology of polyvinyl alcohol casting film and polyvinyl alcohol film, which is applied in the directions of instruments, polarizing elements, optical elements, etc., can solve the problems of high haze of PVA film, affecting light transmittance, affecting the use effect of PVA film, etc.

Pending Publication Date: 2021-05-11
安徽皖维先进功能膜材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to peel the PVA film from the roller and adjust the drying process of the film, it is usually necessary to add a surfactant to the solution, but the addition of the surfactant will cause aggregates inside the solution, and at the same time change the surface tension of the film, resulting in PVA film The high haze affects the light transmittance, which in turn affects the actual use effect of PVA film in various scenarios such as optical film, packaging film or isolation film.

Method used

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  • Polyvinyl alcohol casting solution, polyvinyl alcohol film and preparation method and application thereof
  • Polyvinyl alcohol casting solution, polyvinyl alcohol film and preparation method and application thereof
  • Polyvinyl alcohol casting solution, polyvinyl alcohol film and preparation method and application thereof

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preparation example Construction

[0047] Based on the PVA film casting solution provided above, the present invention also proposes a specific example of a method for preparing a PVA film. The PVA film is prepared by conventional solution coating and casting method. In one embodiment of the preparation method of the PVA film provided by the present invention, the preparation method of the PVA film includes the following steps: drying the PVA film casting liquid to obtain a PVA film, and the PVA film casting liquid For the above-mentioned PVA film casting solution provided by the present invention, when the PVA film casting solution provided by the present invention is used to prepare the PVA film, the haze of the PVA film can be effectively controlled, and the surface tension of the film is reduced, and it is easy to peel off from the metal stick surface. Effect. Specifically, the PVA casting solution is extruded through a die and cast onto a roller or a steel belt, and then dried at high temperature or with h...

Embodiment 1

[0055] (1) The preparation method of PVA film casting solution: the PVA polymer (polymerization degree 1700, degree of alcoholysis 99.9%) of 1000 mass parts, the glycerin of 11 mass parts, the lauric acid diethanolamide (non-linear type) of 0.5 mass parts surfactant), 0.25 parts by mass of sodium lauryl polyoxyethylene ether sulfate (linear surfactant) and 0.2 parts by mass of sodium lauryl sulfate (linear surfactant), at 150 ° C ( High pressure) is dissolved in deionized water to form a PVA casting solution with a moisture content of 75wt%;

[0056] (2) Cool the PVA casting film stock solution prepared in step (1) to 95°C, discharge it through a 2m wide die, cast it onto a metal roller with a diameter of 2m, and dry the stock solution on the roller with 90°C hot air. film, and then through 11 sets of drying rollers, the front and back sides of the film are repeatedly dried in the range of 60-110 °C until the water content of the PVA film is 1-10 wt%, and a PVA film with an av...

Embodiment 2

[0059] (1) The preparation method of PVA film casting solution: the PVA polymer (polymerization degree 1700, degree of alcoholysis 99.9%) of 1000 mass parts, the glycerin of 11 mass parts, the lauric acid diethanolamide (non-linear type) of 0.5 mass parts surfactant), 0.5 parts by mass of sodium lauryl polyoxyethylene ether sulfate (linear surfactant) and 0.2 parts by mass of sodium lauryl sulfate (linear surfactant), at 150 ° C ( High pressure) is dissolved in deionized water to form a PVA casting solution with a moisture content of 75wt%;

[0060] (2) Cool the PVA casting film stock solution prepared in step (1) to 95°C, discharge it through a die with a width of 2m, cast it onto a metal roller with a diameter of 2m, and dry the stock solution on the roller with hot air at 90°C. film, and then through 11 sets of drying rollers, the front and back sides of the film are repeatedly dried in the range of 60-110°C until the water content of the PVA film is 1-10wt%, and a PVA film...

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Abstract

The invention discloses a polyvinyl alcohol casting solution, a polyvinyl alcohol film and a preparation method and application thereof. The polyvinyl alcohol casting solution comprises a solvent, polyvinyl alcohol and surfactants, wherein the surfactants comprise at least one non-linear surfactant and at least one linear surfactant. According to the invention, at least one non-linear surfactant and at least one linear surfactant are selected and compounded for use, so that the polyvinyl alcohol film prepared from the polyvinyl alcohol casting solution has the characteristics of low haze and high light transmittance, the haze value is 0-1%, the light transmittance reaches 92% or above, and the film can be applied to various use scenes such as optical films, packaging films and isolating films.

Description

technical field [0001] The invention relates to the technical field of optical films, in particular to a polyvinyl alcohol casting liquid, a preparation method of a polyvinyl alcohol film and an application thereof. Background technique [0002] Polyvinyl alcohol (PVA) film is usually produced by solution coating casting method, which is obtained by casting the PVA casting solution onto a roller, drying it on the roller to form a film, and then peeling off from the roller, heat treatment, and winding. finished product. In order to peel the PVA film from the roller and adjust the drying process of the film, it is usually necessary to add a surfactant to the solution, but the addition of the surfactant will cause aggregates inside the solution, and at the same time change the surface tension of the film, resulting in PVA film The high haze affects the light transmittance, which in turn affects the actual use effect of PVA film when used in various scenarios such as optical fi...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L71/02C08K5/20C08K5/41C08K5/053C08J5/18G02B5/30
CPCC08J5/18G02B5/3033C08J2329/04C08J2471/02C08K5/20C08K5/41C08K5/053
Inventor 李良彬王道亮张前磊
Owner 安徽皖维先进功能膜材料研究院有限公司
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