A kind of polyvinyl alcohol melt with good rheology and its film preparation method

Abstract

The invention belongs to the technical field of film or sheet manufacture, and specifically discloses a polyvinyl alcohol-based melt with good rheological properties and a preparation method for a film thereof. A polyvinyl alcohol melt with good rheological properties, the polyvinyl alcohol melt includes a polyvinyl alcohol polymer, water, a plasticizer, a surfactant and an antioxidant, the polyvinyl alcohol melt The temperature of the body is 70-120° C., the load is 2.16 kg, and the melt flow index is 1.0-50 g / min at a water content of 40-70%. The polyvinyl alcohol film prepared by using the polyvinyl alcohol 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 polyvinyl alcohol melt with good rheological properties and a method for preparing a film thereof. 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. Polyvinyl alcohol-based 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,...

AI Technical Summary

Problems solved by technology

[0003] However, the polyvinyl alcohol-based films prepared by conventional preparation methods and conventional production lines tend to have the following technical problems: 1. There are many crystal points and stains on the prepared polyvinyl alcohol-based films, which affect the optical properties of the film

2. When the polyvinyl alcohol film is used to prepare a polarizer and stretch the polyvinyl alcohol film, the film is easy to break and the tensile performance is not good; and when the film is dyed, the dyeing is uneven

3. When producing wide-width polyvinyl alcohol film, the thickness of the two sides and the middle of the polyvinyl alcohol film is likely to be inconsistent, which may cause the surface undulation height of the local area of ​​the polyvinyl alcohol film to be too large, resulting in the thickness of the polyvinyl alcohol film Membrane surface finish is not enough

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