Method for manufacturing mica sheet and mica sheet

Abstract

The present invention relates to a method for manufacturing a mica sheet, particularly to a method for manufacturing a mica sheet, in such a way that no dust is generated on a cut surface of the mica sheet formed by laminating a plurality of mica papers. The method for manufacturing a mica sheet of the present invention comprises: a first coating step of impregnating a cut mica paper with a first resin, thereby forming an adhesive layer coating the entire surface; a lamination step of stacking, to a predetermined thickness, a plurality of mica papers coated with the adhesive layer; a mica sheet manufacturing step of manufacturing a mica sheet by thermally compressing the laminated mica papers to be bonded one another by the adhesive layer; a cutting step of cutting the mica sheet into a predetermined size; a second coating step of impregnating the cut mica sheet with a second resin, thereby forming a coating layer on the entire surface; and a second drying step of drying the mica sheet coated with the coating layer, wherein the coating layer formed by the second coating step coats the entire surface of the mica sheet to prevent dust from being generated on the cut surface of the mica sheet by the cutting step.

Description

Mica sheet manufacturing method and mica sheet

[0001] The present invention relates to a method for manufacturing a mica sheet, and more particularly, to a method for manufacturing a mica sheet that prevents dust from being generated at the cut surface of a mica sheet formed by laminating a plurality of mica papers.

[0002] Recently, due to the digitalization and high performance of electronic products, the development of high-capacity batteries that can satisfy miniaturization, thinness, lightness, and high energy density is actively underway.

[0003] Representative examples of high-capacity batteries include lithium-ion secondary batteries, lithium-ion polymer batteries, and supercapacitors, and it is common for multiple batteries to be packed as close together as possible within a battery pack so that they can be applied to miniaturized or thinned electronic devices.

[0004] In this case, heat generated inside the battery or heat applied to the battery from the outside is conducted through adjacent batteries, thereby reducing the function and durability of the electronic device. Therefore, insulating material is inserted between the batteries to block heat conduction, insulate, and delay fire.

[0005] These insulators often use mica paper or mica sheets containing mica.

[0006] Mica paper made of mica is laminated in multiple pieces to form a mica sheet. When the mica sheet is cut and processed into the required size and shape, the cut surface and / or processed surface are exposed to the outside.

[0007] Therefore, there was a problem of dust generated by mica powder on the cut surface and / or processing surface during long-term use.

[0008] The present invention is intended to solve the above-mentioned problems, and its purpose is to provide a method for manufacturing a mica sheet that can prevent dust from being generated in a mica sheet formed by laminating a plurality of mica papers.

[0009] In order to achieve the above object, the present invention provides a method for manufacturing a mica sheet, comprising: a supply step of supplying mica pieces; a mica paper manufacturing step of adding a binder to the supplied mica pieces and then pulping them to manufacture mica paper; a first drying step of drying the manufactured mica paper; a slitting step of cutting the dried mica paper into a predetermined size; a first coating step of forming an adhesive layer by coating the entire surface of the cut mica paper with a first resin; a laminating step of stacking a plurality of mica papers coated with adhesive layers to a predetermined thickness; a mica sheet manufacturing step of pressing the stacked mica papers so that the stacked mica papers are bonded to each other by the adhesive layer, thereby manufacturing a mica sheet; a cutting step of cutting the mica sheet into a predetermined size; a second coating step of forming a coating layer by a second resin on the entire surface of the cut mica sheet; A method for manufacturing a mica sheet, comprising: a second drying step of drying a mica sheet coated with the coating layer; wherein the coating layer formed by the second coating step coats the entire surface of the mica sheet so that dust is not generated at the cut surface of the mica sheet by the cutting step.

[0010] It further comprises a processing step for processing the shape of the cut mica sheet, which is arranged between the cutting step and the second coating step; wherein the coating layer formed by the second coating step coats the entire surface of the mica sheet so that no dust is generated on the surface of the mica sheet after the cutting step and the processing step.

[0011] The above adhesive layer and coating layer are made of resin of the same series and are mutually bonded, and the adhesive strength of the adhesive layer is greater than the adhesive strength of the coating layer due to the additive.

[0012] When manufacturing a mica sheet by thermally compressing the laminated mica paper in the above mica sheet manufacturing step, an embossing is formed on the upper and lower surfaces of the mica sheet.

[0013] The coating layer formed in the second coating step is coated along the surface of the emboss in the same shape as the emboss.

[0014] In the above mica sheet manufacturing step, the laminated mica paper is thermally compressed by a heating press, and a glass fiber pad is attached to the surface of the heating press that comes into contact with the mica paper, and the embossing is formed by the glass fiber pad.

[0015] In the first coating step, the first resin is coated as an adhesive layer on the entire surface of the cut mica paper by at least one of an impregnation method, a spray method, a printing method, and a brush method, and in the second coating step, the second resin is coated as a coating layer on the entire surface of the cut mica paper by at least one of an impregnation method, a spray method, a printing method, and a brush method.

[0016]

[0017] In addition, in order to achieve the above purpose, the mica sheet of the present invention is a mica sheet manufactured by the above-described manufacturing method.

[0018] According to the method for manufacturing a mica sheet of the present invention as described above, the following effects are achieved.

[0019] The present invention can prevent dust from being generated in a mica sheet formed by laminating a plurality of mica papers.

[0020] Specifically, when cutting and processing a mica sheet manufactured by laminating multiple mica papers, the side surface is exposed to the outside as it is. However, the present invention forms a coating layer over the entire surface of the mica sheet through the second coating step, thereby forming a new coating layer on the side surface of the cut mica sheet, thereby preventing mica powder from flying and generating dust.

[0021] Figure 1 is a process diagram of a mica sheet manufacturing method according to an embodiment of the present invention.

[0022] Figure 2 is a photograph of a mica sheet according to an embodiment of the present invention.

[0023] The mica sheet manufacturing method of the present invention comprises, as illustrated in FIG. 1, a supply step (S1), a mica paper manufacturing step (S2), a first drying step (S3), a slitting step (S4), a first coating step (S5), a lamination step (S6), a mica sheet manufacturing step (S7), a cutting step (S8), a processing step (S9), a second coating step (S10), and a second drying step (S11).

[0024] The above supply step (S1) is a step for supplying a large quantity of mica pieces.

[0025] The above mica paper manufacturing step (S2) is a step of manufacturing mica paper by adding a binder to the mica pieces supplied in the above supply step (S1) and then pulping them.

[0026] The process for manufacturing mica paper is the same as the conventionally known process, so a detailed description thereof is omitted.

[0027] The above first drying step (S3) is a step of drying the mica paper manufactured in the above mica paper manufacturing step (S2).

[0028] The above slitting step (S4) is a step of cutting the mica paper dried by the first drying step (S3) into a predetermined size.

[0029] In the above slitting step (S4), the mica paper is cut at both ends or in the front-back direction to have a predetermined size.

[0030] The above first coating step (S5) is a step of forming an adhesive layer by coating the entire surface of the mica paper cut by the above slitting step (S4) with the first resin.

[0031] The above first coating step (S5) coats the adhesive layer with the first resin over the entire surface of the cut mica paper by at least one of an impregnation method, a spray method, a printing method, and a brush method.

[0032] The impregnation method refers to a method of coating by immersing cut mica paper in a tank filled with the first resin.

[0033] The spray method refers to a method of coating cut mica paper by spraying the first resin.

[0034] The printing method refers to a method of coating cut mica paper by filling the first resin into a conventional printing device, etc. and then printing on the cut mica paper.

[0035] The brush method refers to a method of coating the entire surface of cut mica paper by applying the first resin using brushes of various shapes.

[0036] In addition, the first coating step (S5) of the present invention coats the entire surface of the cut mica paper with an adhesive layer using a first resin using various conventionally known coating methods.

[0037] The above first resin is made of silicone, urethane, epoxy, other known resins or paints, etc.

[0038] The above lamination step (S6) is a step of laminating a plurality of mica papers coated with an adhesive layer to a predetermined thickness.

[0039] The above mica sheet manufacturing step (S7) is a step of manufacturing a mica sheet by thermally compressing a plurality of mica papers laminated by the above lamination step (S6).

[0040] Specifically, when a plurality of mica papers are stacked vertically and pressed vertically while applying heat, the adhesive layer disposed between the plurality of mica papers melts due to the heat, and the mica paper disposed on top and the mica paper disposed on the bottom are strongly bonded to each other.

[0041] When multiple mica papers are laminated and combined by the adhesive layer as described above, a mica sheet thicker than the mica paper is manufactured.

[0042] The above cutting step (S8) is a step of cutting a large mica sheet into a predetermined size.

[0043] The above processing step (S9) is a step of processing the shape of the mica sheet cut into small pieces by the above cutting step (S8).

[0044] In the above processing step (S9), a hole is formed in the mica sheet or the perimeter is cut to process it.

[0045] When the above-described cutting step (S8) and / or processing step (S9) is completed, the cut side of the mica sheet is exposed to the outside as the adhesive layer is removed.

[0046] In this case, dust is likely to be generated as the mica exposed to the outside flies away.

[0047] To prevent this, the present invention performs a second coating step (S10).

[0048] The above second coating step (S10) is a step of forming a coating layer with a second resin on the entire surface of the mica sheet cut and / or processed by the above cutting step (S8) and / or processing step (S9).

[0049] The second coating step (S10) coats a coating layer on the entire surface of the mica sheet cut and / or processed using the second resin by at least one of an impregnation method, a spray method, a printing method, and a brush method.

[0050] The above second resin is made of silicone, urethane, epoxy, other known resins or paints, etc.

[0051] By the second coating step (S10), a new coating layer is formed on the side of the mica sheet from which the adhesive layer has been removed through the cutting step (S8) and / or processing step (S9).

[0052] As described above, the coating layer formed by the second coating step (S10) coats the entire surface of the mica sheet to prevent dust from being generated on the surface of the mica sheet that has completed the cutting step (S8) and processing step (S9).

[0053] The above second drying step (S11) is a step of drying the mica sheet coated with the coating layer.

[0054] After the second drying step (S11), the mica sheet is inspected and loaded.

[0055] Figure 2 shows the mica sheet of the present invention that has completed the second drying step (S11).

[0056] The adhesive layer used in the first coating step (S5) and the coating layer used in the second coating step (S10) are made of the same series of resin.

[0057] For example, both the adhesive layer and the coating layer are made of silicone resin.

[0058] As described above, since the adhesive layer and the coating layer are made of the same series of resin, when the coating layer is coated, the adhesive layer and the coating layer can be more strongly bonded.

[0059] And, the adhesive strength of the adhesive layer is made greater than the adhesive strength of the coating layer by using various binder and other additives.

[0060] Through this, the adhesive layer can maintain a laminated and bonded state without the multiple laminated mica papers being separated.

[0061] Meanwhile, in the mica sheet manufacturing step (S7), when manufacturing a mica sheet by thermally pressing the laminated mica paper, a plurality of embossings may be formed on the upper and lower surfaces of the mica sheet.

[0062] And, the coating layer formed in the second coating step (S10) is coated along the surface of the emboss in the same shape as the emboss.

[0063] As a method for forming the above embossing, the mica paper laminated in the mica sheet manufacturing step (S7) is thermally compressed using a heating press, and a glass fiber pad is attached to the surface of the heating press that comes into contact with the mica paper.

[0064] The above glass fiber pad has a woven pattern formed to form the above embossing, so that when the mica paper on which the glass fiber pad is laminated is pressed during thermal compression by the heating press, a plurality of embossings are formed on the upper and lower surfaces of the mica sheet.

[0065] Figure 2 shows that a number of embosses are formed on the surface of the mica sheet.

[0066] By forming the embossed shape on the surface of the mica sheet as described above, the contact area between the coating layer coated on the surface of the embossed shape and the embossed shape can be increased, thereby allowing the coating layer to be more strongly bonded to the upper and lower surfaces of the mica sheet on which the embossed shape is formed.

[0067] As described above, in the present invention, when cutting and processing a mica sheet in a state where a plurality of mica papers are laminated to manufacture a mica sheet, the side surface is exposed to the outside. However, by forming a coating layer on the entire surface of the mica sheet through the second coating step (S10), a new coating layer is also formed on the side surface of the cut mica sheet, thereby preventing mica powder from flying and generating dust.

[0068]

[0069] The mica sheet manufacturing method and mica sheet of the present invention are not limited to the above-described embodiments, and can be implemented by making various modifications within the scope permitted by the technical concept of the present invention.

[0070] The present invention can be applied to a mica sheet and a method for manufacturing the same, and thus has industrial applicability.

Claims

1. A supply step for supplying mica pieces; A mica paper manufacturing step of manufacturing mica paper by adding a binder to the supplied mica pieces and then pulping them; A first drying step of drying the manufactured mica paper; A slitting step for cutting dried mica paper into a predetermined size; A first coating step of forming an adhesive layer by coating the entire surface of the cut mica paper with a first resin; A lamination step of laminating a plurality of mica papers coated with an adhesive layer to a predetermined thickness; A mica sheet manufacturing step of manufacturing a mica sheet by thermally compressing laminated mica papers so that the laminated mica papers are bonded to each other by the adhesive layer; A cutting step of cutting the above mica sheet into a predetermined size; A second coating step of forming a coating layer with a second resin on the entire surface of the cut mica sheet; It comprises a second drying step of drying the mica sheet coated with the above coating layer; A method for manufacturing a mica sheet, characterized in that the coating layer formed by the second coating step coats the entire surface of the mica sheet so that dust is not generated at the cut surface of the mica sheet by the cutting step.

2. In claim 1, It further comprises a processing step for processing the shape of the cut mica sheet, which is arranged between the cutting step and the first coating step. A method for manufacturing a mica sheet, characterized in that the coating layer formed by the second coating step coats the entire surface of the mica sheet so that no dust is generated on the surface of the mica sheet after the cutting step and processing step.

3. In claim 1, The above adhesive layer and coating layer are made of the same series of resins and are mutually bonded, A method for manufacturing a mica sheet, characterized in that the adhesive strength of the adhesive layer is greater than the adhesive strength of the coating layer due to the additive.

4. In claim 1, A mica sheet manufacturing method characterized in that, when manufacturing a mica sheet by thermally compressing laminated mica paper in the above mica sheet manufacturing step, an embossing is formed on the upper and lower surfaces of the mica sheet.

5. In claim 4, A method for manufacturing a mica sheet, characterized in that the coating layer formed in the second coating step is coated along the surface of the emboss in a shape similar to the emboss.

6. In claim 4, In the above mica sheet manufacturing step, the laminated mica paper is thermally compressed by a heating press, The above heating press has a glass fiber pad attached to the surface that comes into contact with the mica paper. A method for manufacturing a mica sheet, characterized in that the above embossing is formed by the above glass fiber pad.

7. In claim 1, In the first coating step, the first resin is coated on the entire surface of the cut mica paper to form an adhesive layer by at least one of a spraying method, a printing method, a brush method, and an impregnation method. A method for manufacturing a mica sheet, characterized in that in the second coating step, the second resin is coated as a coating layer on the entire surface of the cut mica paper by at least one of a spray method, a printing method, a brush method, and an impregnation method.

8. A mica sheet manufactured by the manufacturing method of any one of claims 1 to 7.

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