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Preparation method of high-concentration and low-viscosity polyvinyl alcohol melt and film thereof

A polyvinyl alcohol-based and polyvinyl alcohol technology, which is applied in the field of high-concentration and low-viscosity polyvinyl alcohol-based melt and the preparation of its film, can solve the problem of insufficient surface finish of the polyvinyl alcohol-based film, polyvinyl alcohol-based film polycrystalline It can improve the tensile stability, avoid excessive undulation height, and facilitate dissolution and modification.

Active Publication Date: 2021-07-02
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment discloses a high-concentration and low-viscosity polyvinyl alcohol-based melt, which includes polyvinyl alcohol-based polymers, water, plasticizers, surfactants and antioxidants ; High-concentration and low-viscosity polyvinyl alcohol melt at a temperature of 90°C and a shear rate of 100S -1 The apparent shear viscosity is 88Pa·S.

[0039] When testing the viscosity of the above-mentioned high-concentration and low-viscosity polyvinyl alcohol melt, a high-pressure capillary rheometer is used. The diameter of the capillary die is 1mm, the aspect ratio is 16, Bagley correction is performed in real time, and the temperature is 90°C.

[0040] The preparation of high-concentration and low-viscosity polyvinyl alcohol melt comprises the following steps, wherein step (1)-step (5) are all carried out under the protection of inert gas:

[0041] (1) Get the following raw materials in parts by mass: 100 parts of polyvinyl alcohol, 2 parts of cellulose, 1 part of ur...

Embodiment 2

[0050] This embodiment discloses a high-concentration and low-viscosity polyvinyl alcohol melt. The high-concentration and low-viscosity polyvinyl alcohol melt includes polyvinyl alcohol polymers, water, plasticizers, surfactants and antioxidants; The high-concentration and low-viscosity polyvinyl alcohol-based melt is heated at a temperature of 90°C and a shear rate of 100S -1 The apparent shear viscosity is 92Pa·S.

[0051] The preparation of high-concentration and low-viscosity polyvinyl alcohol melt comprises the following steps, wherein step (1)-step (5) are all carried out under the protection of inert gas:

[0052] (1) Get the following raw materials in parts by mass: 100 parts of polyvinyl alcohol, 1 part of cellulose, 7 parts of urea, 20 parts of plasticizer, 0.09 part of surfactant, 0.005 part of antioxidant, 2 parts of nano silicon dioxide The polyvinyl alcohol used wherein has a degree of polymerization of 3000 and a degree of alcoholysis of 99.9mol%;

[0053] (2...

Embodiment 3

[0060] This embodiment discloses a high-concentration and low-viscosity polyvinyl alcohol melt. The high-concentration and low-viscosity polyvinyl alcohol melt includes polyvinyl alcohol polymers, water, plasticizers, surfactants and antioxidants; The high-concentration and low-viscosity polyvinyl alcohol-based melt is heated at a temperature of 90°C and a shear rate of 100S -1 The apparent shear viscosity is 88Pa·S.

[0061] When testing the viscosity of the above-mentioned high-concentration and low-viscosity polyvinyl alcohol melt, a high-pressure capillary rheometer is used. The diameter of the capillary die is 1mm, the aspect ratio is 16, Bagley correction is performed in real time, and the temperature is 90°C.

[0062] The preparation of high-concentration and low-viscosity polyvinyl alcohol melt comprises the following steps, wherein step (1)-step (5) are all carried out under the protection of inert gas:

[0063] (1) Get the following raw materials in parts by mass: 1...

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Abstract

The invention belongs to the technical field of film or sheet manufacture, and specifically discloses a high-concentration and low-viscosity polyvinyl alcohol melt and a method for preparing the film. A high-concentration and low-viscosity polyvinyl alcohol melt, the high-concentration and low-viscosity polyvinyl alcohol melt includes polyvinyl alcohol polymers, water, plasticizers, surfactants and antioxidants, the high Concentrated low-viscosity polyvinyl alcohol-based melt at a temperature of 90°C and a shear rate of 100S ‑1 When the apparent shear viscosity is 50‑160Pa·S. The polyvinyl alcohol film prepared by using the high-concentration and low-viscosity 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 high-concentration and low-viscosity polyvinyl alcohol melt 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 microsco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L1/02C08K5/21C08K3/36C08J5/18
CPCC08J5/18C08J2329/04C08J2401/02C08K3/36C08K5/21C08K2201/011
Inventor 吕惠霞胡腊梅陆春因李永江
Owner CHINA PETROLEUM & CHEM CORP