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Method for manufacturing polyimide film by chemical imidization of polyamic acid bath mode

A polyimide film and chemical imidization technology, applied in the field of polymer material manufacturing and flexible printing, can solve problems such as poor finished product performance, achieve low residual internal stress, good dimensional stability, and low coefficient of linear expansion. Effect

Active Publication Date: 2015-08-12
HUAWEI POLYIMIDE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the poor performance of the finished product in the thermal imidization method of polyamic acid in the prior art, and provide a bath mode chemical imidization method of polyamic acid

Method used

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  • Method for manufacturing polyimide film by chemical imidization of polyamic acid bath mode

Examples

Experimental program
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Effect test

Embodiment 1

[0038]Take 600 kg of polyamic acid glue with a viscosity of 245,100 centipoise and stir and disperse it with a high-speed disperser at a speed of 2300 rpm for 80 seconds. Cover on the endless stainless steel belt placed in the closed clean system, and evenly cast a layer of polyamic acid film on the endless stainless steel belt of the casting machine at a speed of 3.5m / min. When the solid content is 35-40% At the same time, the partly gelled and self-supporting film is peeled off by the peeling roller, and sent to the bathing tank. After soaking for 80 seconds, the impregnated liquid droplets on the gel film are eliminated by means of an air knife, etc., and the silicone rubber roller Send it to the chemical imidization furnace for chemical imidization at three temperature sections of 75°C, 130°C, and 175°C, and the residence time of each section is 20s. Then the chemical imidized gel film is peeled off the endless steel strip by the peeling roller, and after being pulled by t...

Embodiment 2

[0041] Take 600kg of polyamic acid glue with a viscosity of 237,200 centipoise and stir and disperse it with a high-speed disperser at a speed of 2200 rpm for 120 seconds. Cover on the endless stainless steel belt placed in the closed clean system, and evenly cast a layer of polyamic acid film on the endless stainless steel belt of the casting machine at a speed of 5m / min. When the solid content is 35-40% , the partly gelled and self-supporting film is peeled off by the peeling roller, and sent to the bathing tank. After soaking for 60 seconds, the impregnated liquid droplets on the gel film are eliminated by means of an air knife, and sent by a silicone rubber roller. In the chemical imidization furnace, chemical imidization is carried out at three temperature sections of 65°C, 125°C, and 165°C. After each period of residence time, the chemical imidization gel film is peeled off the endless steel strip through the stripping roller, and the 1. After bidirectional stretching wi...

Embodiment 3

[0044] Take 600kg of polyamic acid glue with a viscosity of 232,900 centipoise and stir and disperse it with a high-speed disperser at a speed of 2500 rpm for 60 seconds. Covered on the endless stainless steel belt placed in the closed clean system, and cast evenly on the endless stainless steel belt of the casting machine at a speed of 2.5m / min to form a layer of polyamic acid film, when the solid content is 35-40% At the same time, the partially gelled and self-supporting film is peeled off by the peeling roller, and sent to the bathing tank. After soaking for 120 seconds, the impregnated liquid droplets on the gel film are eliminated by means of an air knife, etc., and the silicone rubber roller Send it to the chemical imidization furnace for chemical imidization at three temperature sections of 85°C, 135°C, and 185°C. After each period of residence time, the chemical imidization gel film is peeled off the endless steel strip by the peeling roller, and the After bidirection...

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Abstract

The invention discloses a preparation method by carrying out chemical imidization on a polyamic acid glue solution in a bath mode, and the preparation method comprises the following steps of: casting or coating polyamic acid glue liquid into a polyamic acid glue film, placing into bath liquid which comprises a dewatering agent and a catalyst, and soaking for 60-120 seconds; then removing soaking liquid drops positioned on a gel film by using an air knife, and placing into a chemical imidization furnace for chemical imidization at three temperature sections, namely 65-85 DEG C, 125-135 DEG C and 165-185 DEG C, wherein three retention time periods in a furnace cavity are respectively 5-30 seconds, 5-30 seconds and 5-30 seconds; then bidirectionally stretching at the stretch ratio of 1.18-1.25, and then placing into an infrared furnace at 370-420 DEG C for complete imidization processing, wherein the duration time of imidization inside the infrared furnace enables the residual quantity of the solvent contained in the gel film to be less than 3%; and carrying out corona film processing, trimming edges, and coiling to prepare a polyimide film. The polyimide film material prepared by adopting the method disclosed by the invention has the advantages of small residual internal stress, good dimensional stability and low linear expansion coefficient.

Description

technical field [0001] The invention relates to a bath mode chemical imidization manufacturing method of polyamic acid, which belongs to the field of polymer material manufacturing and is especially suitable for the technical field of flexible printing. Background technique [0002] The thermal imidization method is currently adopted by most domestic polyimide manufacturers. This method is to coat polyamic acid solution and then perform high-temperature heat treatment to form polyimide. The heating process of imidization is divided into two stages, the first stage is a heat treatment section below 150°C, and the second stage is an imidization section higher than the glass transition temperature of polyimide. The imidization process in production should be carried out in stages while gradually raising the temperature, and the temperature can be raised to about 400 degrees, which has higher requirements for production equipment and process conditions. In the process of therma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L79/08C08G73/10
Inventor 黄渝鸿袁萍李晓敏邢涛黄樯
Owner HUAWEI POLYIMIDE
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