A polyvinyl alcohol-based film with good durability and its preparation method

A polyvinyl alcohol-based film and technology of polyvinyl alcohol-based film, applied in the field of polyvinyl alcohol-based film and its preparation, can solve the problems of poor optical properties and tensile properties of polyvinyl alcohol-based films, poor product durability, uneven dyeing, etc. , to achieve the effect of smooth surface, uniform material mixing and uniform dyeing

CN109438734BActive Publication Date: 2021-08-27CHINA PETROLEUM & CHEM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-08-27

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Abstract

The application of the present invention belongs to the technical field of polyvinyl alcohol-based optical films, and specifically discloses a polyvinyl alcohol-based film with good durability and a preparation method thereof. The raw material for preparing a polyvinyl alcohol-based film with good durability includes polyvinyl alcohol It is a polymer and a plasticizer composition, and the ratio I / S of the isotactic content (I) and the syndiotactic content (S) in the molecular structure of the polyvinyl alcohol-based polymer is 1.5<I / S≤2.0 . The polyvinyl alcohol film prepared by using the polyethylene polymer has the following advantages: 1. The film has few crystal points and excellent optical properties; 2. The dyeability and ductility are uniform, and there are few stains; 4. The product has excellent durability.
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Description

technical field

[0001] The invention belongs to the technical field of polyvinyl alcohol-based optical films, and specifically discloses a polyvinyl alcohol-based film with good durability and a preparation method thereof. Background technique

[0002] Polyvinyl alcohol-based (PVA) film is an important raw material for the production of polarizers, a key component of liquid crystal displays (LCDs), and is a high-end application field downstream of PVA. Display panels and their upstream glass substrates, polarizers, etc. are all new materials that are in short supply in China that the state encourages to develop. With the gradual transfer of panel products to mainland China, my country has become a country with a large demand for polarizers, and PVA optical film, as the core functional layer of polarizers, is currently completely dependent on imports. From 2016 to 2020, my country plans to achieve a localization rate of more than 30% for display panels and glass substrates, ...

Examples

Embodiment 1

[0035] This embodiment discloses a method for preparing a polyvinyl alcohol-based film with good durability, comprising the following steps:

[0036] (1) Test the molecular structure of polyvinyl alcohol-based polymers by proton nuclear magnetic spectroscopy, and calculate the ratio of the isotactic content (I) to the syndiotactic content (S) in the molecular structure, and select a polymer with I / S of 1.8 Vinyl alcohol polymer. H NMR testing of polyvinyl alcohol polymers 1 H-NMR experiments, 1 All H-NMR experiments were carried out on a Bruker AV4000 nuclear magnetic resonance instrument; 1 In the H-NMR experiment, DMSO was used as a solvent (99.9% deuterium), TMS calibration, the concentration of polyvinyl alcohol polymer was 2.5mg / 0.5ml, and the test was carried out at room temperature;

[0037] The polyvinyl alcohol polymer tested in this step is to infiltrate the 100-120 mesh ordinary polyvinyl alcohol powder with HCl, and carry out solid-liquid mixing with diketene at...