A kind of PVA system melt special for optical film and its film preparation method

An optical film and melt technology, applied in optics, optical components, applications, etc., can solve the problems of insufficient surface smoothness of optical films, polycrystalline points of optical films, color spots, affecting the optical performance of films, etc., to reduce color spots. Produces, smoothes the surface, facilitates dissolution and modification

Active Publication Date: 2021-06-04
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the optical films prepared by conventional preparation methods and conventional production lines tend to have the following technical problems: 1. There are many crystal points and color spots on the prepared optical films, which affect the optical properties of the film
2. When the optical film is used to prepare a polarizer and the optical film is stretched, the film is easy to break and the stretching performance is not good; and when the film is dyed, the dyeing is uneven
3. When producing wide-format optical films, the thickness of the two sides and the middle of the optical film is prone to inconsistency, which may cause the surface undulation height of the local area of ​​the optical film to be too large, resulting in insufficient surface finish of the optical film

Method used

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  • A kind of PVA system melt special for optical film and its film preparation method
  • A kind of PVA system melt special for optical film and its film preparation method
  • A kind of PVA system melt special for optical film and its film preparation method

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Embodiment 1

[0041] This embodiment discloses a PVA-based melt with good fluidity. The PVA-based melt includes polyvinyl alcohol-based polymers, water, starch, n-butyraldehyde, plasticizers, surfactants and antioxidants. The PVA-based melts The melt has a melt flow index of 28 g / min at a temperature of 106° C., a load of 2.24 kg, and a water content of 40-80%. After several researches by the applicant, it was found that the optical film prepared from the PVA-based melt has a smooth surface, fewer crystal points, and excellent optical properties; The probability of film breakage during the process is very small; and when dyeing, the dye can be evenly distributed on the optical film to ensure the uniformity of film dyeing.

[0042] The flow index of the PVA-based melt is tested on a melt flow rate meter according to the test method of GB3682-2000.

[0043] A special PVA-based melt for optical films. The preparation steps of the PVA-based melt are completed under the protection of an inert g...

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Abstract

The invention belongs to the technical field of film or sheet manufacture, and specifically discloses a special PVA-based melt for optical films and a preparation method. PVA-based melt, said PVA-based melt includes polyvinyl alcohol polymer, water, starch, n-butyraldehyde, plasticizer, surfactant and antioxidant, said PVA-based melt is at a temperature of 90- 120°C, load 2.24kg, melt flow index 10-50g / min at water content 40-80%. The optical film prepared by using the PVA melt has the following advantages: the film has few crystal points, excellent optical performance, good stretchability and ductility, and uniform dyeing.

Description

technical field [0001] The invention belongs to the technical field of film or sheet manufacture, and in particular relates to a special PVA melt for optical films and a method for preparing the film. Background technique [0002] Liquid crystal display (LCD) has gradually replaced the traditional cathode ray tube (CRT) with its advantages of thinness, low power consumption, no radiation, stable image, and easy large-area display, and has become the mainstream product of terminal display in the information age. Optical film is an important raw material for making polarizers, the core component of liquid crystal displays (LCDs), and is one of the downstream high-end applications of PVA. Polarizer is a key component of LCD panel, its main function is to convert natural light into polarized light. With the development of LCD applications from small instruments such as calculators, testing instruments, various polarization microscopes, sunglasses, anti-glare goggles, and anti-g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L3/02C08L71/02C08J3/21C08J5/18G02B1/04B29D7/01
CPCB29D7/01C08J3/215C08J5/18C08J2329/04C08J2403/02C08J2471/02G02B1/04
Inventor 吕惠霞陆春因胡腊梅李永江
Owner CHINA PETROLEUM & CHEM CORP
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