KR102624764B1 - Acrylic adhesive tape for winding type aluminum electrolytic condenser - Google Patents

Abstract

The present invention relates to an acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor, and more specifically, to an acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor in which the content of acrylic acid in the adhesive layer is controlled.
The acrylic adhesive tape for wound-type aluminum electrolytic capacitors according to the present invention contains more than a certain amount of acrylic acid, and its loosening state is greatly improved even after chemical conversion and carbonization processes, so it is expected to be utilized as a functional tape for wound-type aluminum electrolytic capacitors.

Description

Acrylic adhesive tape for winding type aluminum electrolytic condenser}

The present invention relates to an acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor, and more specifically, to an acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor in which the content of acrylic acid in the adhesive layer is controlled.

As the density, precision, and high functionality and high performance of parts used in electrical and electronic devices are promoted, technologies such as precision micro-processing and assembly, adoption of new materials, and high-speed automatic production of small quantities of various types of parts are being developed. For this, adhesive tape technology is necessary. It is becoming an indispensable element.

The aluminum electrolytic capacitor has a structure in which an anode made of aluminum foil with an aluminum oxide film on the surface, a cathode made of aluminum foil, and a separator holding the electrolyte solution disposed between the anode and the cathode are accommodated in a sealed case, and is a wound type, Shapes such as the stacked type are widely used.

In double-wound electronic components, adhesives or adhesive tapes are used to secure the elements in order to prevent them from unwinding after winding, and the adhesive tape method, which can be easily mechanized, is the mainstream. A terminal fixing adhesive tape for aluminum electrolytic capacitors using manila hemp paper, kraft paper, synthetic fiber, etc. as a support material has been proposed.

However, since the adhesive or adhesive tape is used in a paste state, there is a problem in that the adhesive flows down and unwinds after winding. In addition, there were problems such as dielectric destruction due to corrosion of aluminum, a dielectric forming base, due to ionization of the halogen component of the adhesive component due to dissolution by the paste.

In addition, since aluminum electrolytic capacitors are manufactured through a chemical conversion process and a carbonization process, adhesives or adhesive tapes are required to have a short-term heat resistance temperature of 260 to 300°C.

The purpose of the present invention is to provide a new adhesive tape that can exhibit a certain level of adhesion even after the chemical conversion and carbonization processes of aluminum electrolytic capacitors in order to solve the problems of the prior art as described above.

The present invention is intended to solve the above problems.

supporting substrate; and an acrylic adhesive layer on one side of the support substrate. An acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor is provided.

In the acrylic adhesive tape for a wound aluminum electrolytic capacitor according to the present invention, the acrylic adhesive layer is 2-Ethylhexyl acrylate, n-Butyl acrylate, or hydroxyethyl acrylate. It is characterized in that it contains one or more ingredients selected from the group consisting of Hydroxyethyl acrylate, Vinyl acetate, and 1-Vinyl-2-Pyrrolidinone.

In the acrylic adhesive tape for a wound aluminum electrolytic capacitor according to the present invention, the acrylic adhesive layer is characterized in that the acrylic acid content is 30% or more. The acrylic adhesive tape for wound aluminum electrolytic capacitors according to the present invention contains more than 30% of acryl acid, which increases the rigidity of the acrylic polymer chain, resulting in low initial adhesive strength and increased adhesive strength over time.

In the acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor according to the present invention, the support substrate has a thickness of 12.5 to 50 μm and contains polyimide.

In the acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor according to the present invention, the adhesive layer of the acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor is characterized in that the adhesive force is 1000 gf/25mm or more.

In the acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor according to the present invention, the acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor is characterized in that the adhesive force of the adhesive layer is 1000 gf/25mm or more after being immersed in a solvent containing adipic acid. Do it as

In the acrylic adhesive tape for a wound aluminum electrolytic capacitor according to the present invention, Poly(vinyl N-octadecylcarbonate) or N-methyl-2-pyrrolidone is applied to the other side of the base material on which the acrylic adhesive layer is formed.

In the acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor according to the present invention, the adhesive strength of the other side of the acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor to which the poly(vinyl N-octadecylcarbonate) or N-methyl-2-pyrrolidone is applied is 500 gf. It is characterized by being less than /25mm.

The acrylic adhesive tape for a rolled-up aluminum electrolytic capacitor according to the present invention contains more than a certain amount of acrylic acid as an adhesive, and the loosening state after impregnation is greatly improved. Accordingly, the acrylic adhesive tape for wound-type aluminum electrolytic capacitors according to the present invention is expected to be utilized as a functional tape for wound-type aluminum electrolytic capacitors.

Hereinafter, the present invention will be described in more detail through examples. However, the present invention is not limited to the following examples.

<Example 1>

An appropriate amount of a solution mixed with an acrylic adhesive (manufacturer: Aekyung Chemical), a curing agent, and a solvent with the acrylic acid content adjusted as follows was applied to one side of a polyimide 25㎛ film (manufacturer: SKC), and then a comma coater was used. And the coating film of the comparative example was prepared.

Afterwards, the tape was manufactured by drying it in an oven at 120°C for 3 minutes to form a pressure-sensitive adhesive layer with a thickness of 25㎛.

acryl acid content (%) Adhesion (gf, 25㎜) Example 1-1 30 1050 Example 1-2 35 1207 Comparative Example 1-1 0 356 Comparative Example 1-2 5 435 Comparative Example 1-3 10 583 Comparative Example 1-4 15 712 Comparative Example 1-5 20 799 Comparative Example 1-6 25 890

<Experimental example>

The tapes made in the above examples and comparative examples were cut to 5 mm in width and 20 mm in length, placed on a rod with a similar diameter as the condenser so that the pressure-sensitive adhesive layer of the tape was in contact, and then rotated the rod to attach the tape to each sample. 120 pieces were manufactured.

<Experimental example> Chemical process adhesion evaluation

In the case of aluminum electrolytic capacitors, adipic acid is mainly used as an electrolyte. Accordingly, adipic acid aqueous solutions with concentrations of 5%, 10%, and 15% were prepared and heated to 80°C, and 20 samples each prepared in the examples and comparative examples were soaked in the adipic acid aqueous solution for 10 and 20 minutes and left. After taking it out and performing a chemical conversion process, the adhesion of the tape was evaluated.

After visually checking the unwinding state of the wound tape for each sample, the length of the unwrapped portion of the tape was measured using a steel ruler, and the unwinding length of 2 mm or less was judged to be in good condition. Table 2 below shows the results of the adhesion evaluation after the chemical process.

Number released after chemical conversion process (adipic acid concentration, immersion time) 5%, 10 minutes 5%, 20 minutes 10%, 10 minutes 10%, 20 minutes 15%, 10 minutes 15%, 20 minutes Example 1-1 0 0 0 0 0 0 Example 1-2 0 0 0 0 0 0 Comparative Example 1-1 20 20 20 20 20 20 Comparative Example 1-2 12 14 13 16 19 20 Comparative Example 1-3 0 13 0 7 0 10 Comparative Example 1-4 0 5 0 7 0 10 Comparative Example 1-5 0 One One 3 6 9 Comparative Example 1-6 0 0 One 4 4 7

<Experimental example> Carbonization process adhesion evaluation

In the above experimental example, the specimen that had completed the chemical conversion process adhesion evaluation was heated at 270°C for 60 minutes to produce a carbonization process adhesion evaluation specimen.

After visually confirming the unwinding state of the wound tape, the length of the part where the tape was unwound was measured using a steel ruler. Anything less than 2 mm was judged to be in good condition.

Table 3 below shows the results of the adhesion evaluation.

Number released after carbonization process (adipic acid concentration, immersion time) 5%, 10 minutes 5%, 20 minutes 10%, 10 minutes 10%, 20 minutes 15%, 10 minutes 15%, 20 minutes Example 1-1 0 0 0 0 0 0 Example 1-2 0 0 0 0 0 0 Comparative Example 1-1 20 20 20 20 20 20 Comparative Example 1-2 20 20 20 20 20 20 Comparative Example 1-3 20 20 20 20 20 20 Comparative Example 1-4 20 20 20 20 20 20 Comparative Example 1-5 14 15 18 20 20 20 Comparative Example 1-6 5 9 14 15 15 20

<Example>

A tape was manufactured by forming an adhesive layer with the same composition as in Example 1-1 on the surface of the polyimide, and to reduce peeling force, RA-585S containing poly(vinyl N-octadecylcarbonate) was diluted in toluene at the ratio below. Then, a tape was manufactured by coating the outer surface of the polyimide base, i.e., the opposite side of the surface on which the pressure-sensitive adhesive layer was applied, to a thickness of 1 ㎛ or less.

Adhesion was measured for each tape and the results are shown in Table 4 below.

RA-585S addition amount (%) Back peeling force (gf, 25㎜) Example 2-1 0.01 515 Example 2-2 0.02 432 Example 2-3 0.03 365 Example 2-4 0.04 312 Example 2-5 0.05 279 Example 2-6 0.06 244

<Experimental example> Chemical process adhesion evaluation

The chemical conversion process adhesion evaluation was performed in the same manner as in Example 1, and the results are shown in Table 5 below.

RA-585S addition amount Number released after chemical conversion process (adipic acid concentration, immersion time) (%) 5%, 10 minutes 5%, 20 minutes 10%, 10 minutes 10%, 20 minutes 15%, 10 minutes 15%, 20 minutes Example 2-1 0.01 0 0 0 0 0 0 Example 2-2 0.02 0 0 0 0 0 0 Example 2-3 0.03 0 0 0 0 0 5 Example 2-4 0.04 0 0 0 0 0 7 Example 2-5 0.05 0 0 One 3 9 15 Example 2-6 0.06 0 0 2 7 15 20

<Experimental example> Carbonization process adhesion evaluation

The chemical conversion process adhesion evaluation was performed in the same manner as in Example 1, and the results are shown in Table 6 below.

RA-585S Number released after carbonization process (adipic acid concentration, immersion time) (%) 5%, 10 minutes 5%, 20 minutes 10%, 10 minutes 10%, 20 minutes 15%, 10 minutes 15%, 20 minutes Example 2-1 0.01 0 0 0 0 0 0 Example 2-2 0.02 0 0 0 0 0 0 Example 2-3 0.03 0 0 0 One 4 6 Example 2-4 0.04 One 2 4 5 9 14 Example 2-5 0.05 4 9 12 13 17 20 Example 2-6 0.06 9 11 14 18 20 20

<Example 3>

A tape was manufactured by forming a pressure-sensitive adhesive layer with the same composition as in Example 1-1 on the surface of the polyimide, and then reducing the peeling force on the outer surface of the polyimide base, that is, the surface opposite to the surface on which the pressure-sensitive adhesive layer was applied. For this purpose, PP25W containing N-methyl-2-pyrrolidone was diluted in IPA in the ratio below and then coated to a thickness of 1 ㎛ or less to prepare a tape.

The back peel force was measured for each tape, and the results are shown in Table 7 below.

PP25W (%) Back peeling force (gf, 25㎜) Example 3-1 0.1 603 Example 3-2 0.2 557 Example 3-3 0.3 482 Example 3-4 0.4 430 Example 3-5 0.5 393 Example 3-6 0.6 359

<Experimental example> Chemical process adhesion evaluation

The chemical conversion process adhesion evaluation was performed in the same manner as in Example 1, and the results are shown in Table 8 below.

PP25W (%) Number released after chemical conversion process (adipic acid concentration, immersion time) 5%, 10 minutes 5%, 20 minutes 10%, 10 minutes 10%, 20 minutes 15%, 10 minutes 15%, 20 minutes Example 3-1 0.1 0 0 0 0 0 3 Example 3-2 0.2 0 0 0 0 9 13 Example 3-3 0.3 0 0 7 10 15 18 Example 3-4 0.4 5 8 17 19 20 20 Example 3-5 0.5 14 16 20 20 20 20 Example 3-6 0.6 20 20 20 20 20 20

<Experimental example> Carbonization process adhesion evaluation

The chemical conversion process adhesion evaluation was performed in the same manner as in Example 1, and the results are shown in Table 9 below.

PP25W
(%) Number released after carbonization process (adipic acid concentration, immersion time) 5%, 10 minutes 5%, 20 minutes 10%, 10 minutes 10%, 20 minutes 15%, 10 minutes 15%, 20 minutes Example 3-1 0.1 5 8 6 12 15 20 Example 3-2 0.2 7 13 16 17 20 20 Example 3-3 0.3 13 15 17 20 20 20 Example 3-4 0.4 20 20 20 20 20 20 Example 3-5 0.5 20 20 20 20 20 20 Example 3-6 0.6 20 20 20 20 20 20

Claims (7)

supporting substrate; and
Includes an acrylic adhesive layer on one side of the support substrate,
The acrylic adhesive layer has an acrylic acid content of 30% to 35% by weight,
A coating liquid containing 0.01 to 0.02% by weight of poly(vinyl N-octadecylcarbonate) is applied to the other side of the support substrate on which the acrylic adhesive layer is formed,
The adhesiveness of the adhesive layer is 1000gf/25mm or more, and the adhesiveness of the other surface is 500gf/25mm or less.
Acrylic adhesive tape for wound aluminum electrolytic capacitors.

According to claim 1,
The acrylic adhesive layer includes 2-Ethylhexyl acrylate, n-Butyl acrylate, Hydroxyethyl acrylate, Vinyl acetate, and 1- Containing one or more ingredients selected from the group consisting of vinyl-2-pyrrolidinone (1-Vinyl-2-Pyrrolidinone)
Acrylic adhesive tape for wound aluminum electrolytic capacitors.
delete According to claim 1,
The thickness of the support substrate is 12.5 to 50㎛ and includes polyimide.
Acrylic adhesive tape for wound aluminum electrolytic capacitors.



















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