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

A polyvinyl alcohol-based film and polyvinyl alcohol-based technology are applied in the field of preparation of polyvinyl alcohol-based melts and films, which can solve the problems of easy breakage, uneven dyeing, and poor tensile properties of the film, and avoid The undulation height is too large, which is beneficial to dissolution and modification, and the effect of improving tensile stability

CN109438889BActive Publication Date: 2021-07-30CHINA PETROLEUM & CHEM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-07-30

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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.
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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,...

Examples

Embodiment 1

[0042] This embodiment discloses a polyvinyl alcohol melt with good rheological properties, said polyvinyl alcohol melt includes polyvinyl alcohol polymer, water, plasticizer, surfactant and antioxidant, said The temperature of the polyvinyl alcohol melt is 90° C., the load is 2.16 kg, and the melt flow index is 1.0-50 g / min when the water content is 40-70%. After repeated studies by the applicant, it was found that the polyvinyl alcohol film prepared from the polyvinyl alcohol melt has a smooth surface, fewer crystal points, and excellent optical properties; its stretchability and ductility are better than those of polyvinyl alcohol films on the market. Vinyl alcohol-based film, the probability of film breakage during the stretching process is very small; and when dyeing, the dye can be evenly distributed on the polyvinyl alcohol-based film to ensure uniform dyeing of the film.

[0043] The flow index of the polyvinyl alcohol melt is tested on a melt flow rate meter according...