PVA-series melt special for optical film and preparation method thereof

Abstract

The invention belongs to the technical field of manufacture of a film or a sheet and particularly discloses PVA-series melt special for an optical film and a preparation method thereof. The PVA-seriesmelt comprises a polyvinyl alcohol-based polymer, water, starch, n-butyraldehyde, a plasticizer, a surfactant and an antioxidant. The PVA-series melt has a melt flow index of 10 to 50 g / min under conditions of a temperature of 90-120 DEG C, load of 2.24kg and water content of 40-80%. An optical film prepared from the PVA-series melt has the advantages of few crystal spots of a crystal film, excellent optical properties, good stretchability, good ductility and uniform dyeing effects.

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...

AI Technical Summary

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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