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

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...

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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

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