KR102008203B1 - Silicon coating method of polyimide film - Google Patents

Abstract

The present invention relates to a silicone coating method of a polyimide film that can be used, such as vehicle navigation, comprising: a film supplying step of releasing and supplying a polyimide film from a supply roll; An impregnation step of impregnating silicon by passing the supplied film through an impregnation tank in which a silicon liquid is stored; A first cryogenic treatment step of low temperature treating the impregnated film impregnated with silicon; A high temperature treatment step of high temperature treatment of the impregnated film after the low temperature treatment: a second low temperature treatment step of low temperature treatment of the impregnated film after the high temperature treatment; It characterized in that it comprises a film winding step of winding the cold-treated silicon impregnated film on the take-up roll.

Description

Silicone coating method of polyimide film {SILICON COATING METHOD OF POLYIMIDE FILM}

The present invention relates to a silicone coating method of a polyimide film, and more particularly, to prevent incomplete solidification in the process of coating the silicone on the polyimide film, the silicone of the polyimide film which can enhance the elasticity and particle binding strength It relates to a coating method.

In general, a polyimide (PI) film is a film of a polyimide resin, and a polyimide resin is a solution polymerization of an aromatic dianhydride and an aromatic diamine or an aromatic diisocyanate to prepare a polyamic acid derivative, and then ring-dehydration at high temperature. Refers to a high heat resistant resin produced by imidization.

Polyimide resin is an insoluble and insoluble ultra high heat resistant resin, and has excellent characteristics such as heat oxidation resistance, heat resistance, radiation resistance, low temperature property, chemical resistance, and so on. It is used in a wide range of fields for electronic materials such as insulating films, semiconductors, electrode protective films of TFT-LCDs, and recently, it has been used in transparent electrode films and the like by containing conductive fillers in the display materials and films such as optical fibers and liquid crystal alignment films or by coating the surfaces thereof.

As described above, the polyimide resin is used in various fields, but in order to improve the functionality, a polyimide resin is also coated with silicone.

However, there was a problem that incomplete coagulation occurs when the coating by simply impregnating the polyimide film in the silicone liquid for the silicon coating.

Republic of Korea Patent No. 10-1049927: Silicone coated plastic bonding sheet and its manufacturing method Republic of Korea Patent No. 10-0651386: Release method of polyimide coverlay and manufacturing method of a flexible multilayer printed circuit board using the release-treated polyimide coverlay

The present invention is to solve the above problems, and an object of the present invention is to provide a silicone coating method of a polyimide film that can easily and firmly silicone coating on a polyimide film.

The silicon coating method of the polyimide film according to the present invention includes a film supply step of releasing and supplying a polyimide film from a supply roll, an impregnation step of impregnating silicon by passing the supplied film through an impregnation tank in which a silicon liquid is stored, and A first low temperature treatment step of low temperature treatment of the impregnated impregnated film, a high temperature treatment step of high temperature treatment of the impregnated film after low temperature treatment, a second low temperature treatment step of low temperature treatment of the impregnated film after high temperature treatment, and a low temperature treated silicon impregnation And a film winding step of winding the film on a winding roll.

When impregnating the said silicone liquid, it is preferable that an impregnation temperature is 20 degrees C or less.

It is preferable to cool the silicon liquid stored in the impregnation tank to reach a temperature of 20 ° C. and then age the film for 20 minutes or more, and then pass the polyimide film through the impregnation tank.

In the film winding step, the silicon impregnated film may be quenched while the silicon impregnated film is wound on the take-up roll, and the quenching treatment of the silicon impregnated film is preferably performed by jet spray.

The polyimide film prepared according to the silicon coating method of the polyimide film of the present invention has the advantage that the incomplete solidification of the silicon is prevented in the coating process of the silicon, the elasticity and the particle binding strength is stronger.

1 is an exemplary view schematically showing the structure of a polyimide film according to the present invention.
Figure 2 is a conceptual diagram showing a manufacturing process according to the silicon coating method of the polyimide film of the present invention.
Figure 3 is a flow chart showing the manufacturing step according to the silicone coating method of the polyimide film of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a silicon coating method of a polyimide film according to an embodiment of the present invention. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Figure 1 shows a polyimide film impregnated with silicon produced by the silicone coating method of the polyimide film of the present invention.

As shown, the polyimide film 1 is coated with silicon 2 impregnated thereon, and a release film 3 is formed on one side.

2 and 3, the silicon coating method of the polyimide film of the present invention includes a film supply step, impregnation step, low temperature treatment step, high temperature treatment step, low temperature treatment step, film winding step.

The polyimide film 1 may be produced by casting a polyamic acid solution onto a support to imide to obtain a film. The imidation method applied at this time can be applied in combination with a thermal imidation method, a chemical imidation method, or a thermal imidation method and a chemical imidation method.

The chemical imidization method is a method of injecting an imidization catalyst represented by a dehydrating agent represented by an acid anhydride such as acetic anhydride and tertiary amines such as isoquinoline, β-picolin and pyridine into a polyamic acid solution. In the case of using the thermal imidization method or the thermal imidization method together with the chemical imidization method, the heating conditions of the polyamic acid solution may vary depending on the kind of the polyamic acid solution, the thickness of the polyimide film 1 to be produced, and the like.

When explaining the manufacturing example of the polyimide film (1) in the case of using a thermal imidation method and a chemical imidation method together more concretely, 80 to-after casting a dehydrating agent and an imidation catalyst in a polyamic-acid solution, and casting on a support body After heating at 200 ° C, preferably 100-180 ° C to activate the dehydrating agent and the imidization catalyst, the polyamic acid film in the gel state is obtained by peeling from the support, and the film in the gel state is 200-400 ° C. The polyimide film 1 can be obtained by heating for 5 to 400 seconds at.

The polyimide film 1 thus obtained may be wound on a feed roll 10 and used as a means for supplying a material for silicon coating.

In the film supply step (S100), the polyimide film 1 wound on the supply roll 10 is released from the supply roll 10 and supplied at a constant speed so that a subsequent process can be performed.

The impregnation step (S200) is a step of impregnating the polyimide film 1 released from the supply roll 10 to coat silicon.

As shown, the polyimide film 1 is released from the supply roll 10 and then passed through the impregnation tank 20 containing the silicon liquid, so that impregnation of silicon is performed in the passage of the impregnation tank 20.

A plurality of guide rollers may guide the traveling path of the polyimide film 1 so that the polyimide film 1 is immersed in the silicone liquid of the impregnation tank 20, and the polyimide film 1 is impregnated. It is immersed in the silicone liquid of (20) and then moved to proceed with the subsequent process.

The time impregnated in the silicon liquid in the impregnation tank 20 may be adjusted to the moving distance that the film moves in the state impregnated with the speed of supplying the film from the supply roll 10.

In addition, when the polyimide film 1 is impregnated in the impregnation tank 20, the impregnation temperature is preferably 20 ° C or less. This is because when the temperature of the impregnation tank 20 is maintained at 20 ° C. or higher, solidification of silicon in the impregnation tank may proceed first by a catalyst cross-linking agent included in the silicon coating solution. This makes it difficult to achieve a good surface state in the coating step, and therefore it is necessary to maintain the temperature below 20 ℃ using a common cooling device outside the impregnation tank (20).

When the silicon liquid stored in the impregnation tank 20 is cooled by using a cooling device, the temperature of the silicon liquid measured by the thermometer reaches 20 ° C., and then aged for 20 minutes or more, and then impregnation of the polyimide film 1 is performed. Proceed.

Even when the silicon liquid is initially measured at 20 ° C., the temperature of the entire silicon liquid stored in the impregnation tank 20 may not reach 20 ° C. FIG. Therefore, due to convection, the silicone liquid is aged for about 20 minutes or more to wait until it is cooled below 20 ° C.

After the polyimide film 1 passes through the impregnation tank 20, the low temperature treatment and the high temperature treatment are performed in the low temperature processor 30 (the first low temperature processor), the high temperature processor 40 and the low temperature processor 30 (the second low temperature processor), respectively. Treatment and cold treatment steps.

Low temperature treatment step (S300) is for the stabilization and smoothness of the silicon impregnated in the polyimide film (1).

In the low temperature treatment step (first low temperature treatment step), the polyimide film 1 impregnated with silicon through the impregnation tank 20 passes through the low temperature processor 30 at a rate of 4 to 6 M / min, and a low temperature coating process is performed. Proceed. At this time, the temperature of the low temperature processor 30 is maintained at about 90 ℃ to 110 ℃.

In the high temperature treatment step (S400), the polyimide film 1 that has passed through the low temperature processor 30 is passed through the high temperature processor 40 at a rate of 4 to 6 min. At this time, the temperature of the high temperature processor is 170 to It is preferable to maintain around 180 degreeC.

If the specified speed and temperature maintenance conditions differ from the above conditions during the low temperature treatment and high temperature treatment, incomplete solidification of the silicon may occur. Therefore, abnormal effects on the surface and material properties of the product, such as reduced strength or bubble, may occur. Can give

In the low temperature treatment step S500 (second low temperature treatment step), the polyimide film 1 passes through the low temperature processor 30 at a rate of 4 to 6 M / min, and is subjected to a low temperature coating process. At this time, the temperature of the low temperature processor 30 is maintained at about 90 ℃ to 110 ℃.

As will be described later, the polyimide film 1 is quenched in the take-up roll 50, and the moisture generated during the quenching process may separate the silicon internal particles and cause a cracking phenomenon. The quenching process is not carried out, but again to the low temperature treatment step to suppress the moisture.

In this way, as the low temperature treatment is further performed on the silicon particles solidified at a high temperature, the binding force between the chemicals of the silyl fumarate and the silyl maleimide and the polyimide film can be enhanced to have excellent physical properties, and the durability thereof can be improved. Can be.

After the silicon-impregnated polyimide film 1 is subjected to a low temperature treatment and a high temperature treatment, the polyimide film 1 is wound on the winding roll 50 again through a low temperature treatment.

And the quenching process is carried out in the process of being wound on the take-up roll 50, the jet spray 60 is installed in the vicinity of the take-up roll 50 for the quenching process, and the film wound through the jet spray (60) Quench.

The jet spray 60 is preferably installed to inject the coolant at a distance of about 70 to 80% of the proper injection distance.

That is, for example, if the proper jet distance of the installed jet spray is 20 cm, it is preferable to install the jet spray at a position about 14 to 16 cm away from the polyimide film winding the jet spray on the take-up roll for this operation. .

In addition, as the winding roll 50 proceeds, the surface of the polyimide film 1 comes closer to the jet spray 60, so that the jet spray 60 has a radial direction from the center of the winding roll 50. It is preferable that the jet spray 60 is movably supported by being mounted on the movable member which is installed to be movable.

By thus quenching the film wound on the winding roll 50, the elasticity and the particle binding force of the film are strengthened.

According to the silicone coating method of the polyimide film 1 according to the present invention described above, after impregnating the silicon and then undergoing a low temperature treatment and a high temperature treatment, the silicon coating method is subjected to a low temperature treatment again and quenched in the winding process to prevent incomplete solidification of the silicon. And a film having enhanced elasticity and particle binding force.

The description of the presented embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention should not be limited to the embodiments set forth herein but should be construed in the broadest scope consistent with the principles and novel features set forth herein.

1: polyimide film
2: silicone coating
3: release film
10: feed roll
20: impregnation tank
30: low temperature processor
40: high temperature processor
50: winding roll
60: jet spray

Claims (5)

A film supplying step of releasing and supplying a polyimide film from a supply roll;
An impregnation step of impregnating silicon by passing the supplied film through an impregnation tank in which a silicon liquid is stored;
A first cryogenic treatment step of low temperature treating the impregnated film impregnated with silicon;
High temperature treatment step of high temperature treatment of impregnated film after low temperature treatment:
A second low temperature treatment step of low temperature treatment of the impregnated film after the high temperature treatment;
It comprises a film winding step of winding the low temperature treated silicon impregnated film on the take-up roll,
In the film winding step, the silicon impregnated film is quenched while the silicon impregnated film is wound on the take-up roll, and the quenching treatment of the silicon impregnated film is made by a jet spray for spraying a coolant onto the silicon impregnated film to be wound, and the jet Spray is a silicone coating method of the polyimide film, characterized in that installed so as to move in a radial direction from the center of the winding roll.
The method of claim 1,
The silicon coating method of the polyimide film, characterized in that the temperature of the silicone liquid is 20 ℃ or less when the silicone liquid is impregnated.
The method of claim 2,
Cooling the silicone liquid stored in the impregnating tank to reach the 20 ℃ ℃ measured value of the thermometer and then the polyimide film of the polyimide film, characterized in that passed through the impregnating tank after aging for 20 minutes or more.
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