KR20190140299A - Waterproof double-sided adhesive tape having improved fracture resistant - Google Patents

Abstract

The present invention relates to a waterproof double-sided tape having excellent fracture resistance and, more specifically, to a waterproof double-sided tape, which comprises: a base layer; a buffer layer formed on one side or both sides of the base layer; and an adhesive layer formed on upper and lower surfaces of the base layer on which the buffer layer is formed. The double-sided tape with the structure has excellent waterproof performance, and exhibits excellent fracture resistance by forming the buffer layer with excellent impact resistance.

Description

Waterproof double sided tape with excellent fracture resistance {WATERPROOF DOUBLE-SIDED ADHESIVE TAPE HAVING IMPROVED FRACTURE RESISTANT}

The present disclosure relates to a waterproof double-coated tape having excellent fracture resistance, and more particularly, to a waterproof double-coated tape showing excellent fracture resistance by forming a buffer layer having excellent waterproof performance and excellent impact resistance.

Double-sided adhesive tape is mainly used for assembling electronic devices equipped with an image display device or an input device. Specifically, a cover panel for protecting the surface of the electronic device is attached to the touch panel module or the display panel module, or touched. Double-sided adhesive tape is used to bond the panel module and the display panel module.

Conventionally, a double-sided adhesive tape is punched into a shape of a picture frame or the like and used to be arranged around the display screen. In recent years, the opening area has been increased due to the miniaturization of electronic devices and the large screen of the display screen. The joint fixing part around the display screen is narrowing. For this reason, the adhesive area of adhesive tape is decreasing year by year, and as adhesive area becomes narrow, further excellent adhesive performance is calculated | required.

In addition, recently, as the thickness of portable electronic devices such as smartphones and digital cameras becomes thinner, the thickness of the double-sided adhesive tape is becoming thinner, and in addition to the adhesive performance, as consumer demand for waterproof performance of portable electronic devices increases, In order to secure a competitive advantage in the market, the development of double-sided tape with waterproof performance is being made.

However, in the case of the conventionally developed double-sided adhesive tape, the waterproof performance of the adhesive layer formed on the double-sided adhesive tape is usually maintained, but when an impact is applied from the outside, there is a problem in that the adhesive layer is cracked and the waterproof performance is lost. .

Korea Patent Registration No. 10-1527184 (2015.06.02) Korean Patent Publication No. 10-2015-0126588 (2015.11.12)

Disclosed is to provide a waterproof double-sided tape that exhibits excellent waterproofing resistance as well as a buffer layer having excellent impact resistance and exhibits excellent fracture resistance.

As one embodiment, the disclosure includes a substrate layer, a buffer layer formed on one surface of the substrate layer, and a fracture resistant layer comprising an adhesive layer formed on upper and lower surfaces of the substrate layer on which the buffer layer is formed. This excellent waterproof double sided tape is described.

As another embodiment, the contents of the present disclosure may include a base layer, a buffer layer formed on both sides of the base layer, and a pressure-sensitive adhesive layer formed on upper and lower surfaces of the base layer on which the buffer layer is formed. This excellent waterproof double sided tape is also described.

Preferably, the base layer may be made of polyethylene terephthalate of 25 to 100㎛.

More preferably, the buffer layer may be made of urethane foam or acrylic foam having a thickness of 10 to 190㎛.

More preferably, the urethane foam may be composed of 100 parts by weight of a urethane resin, 90 to 110 parts by weight of a solvent, 0.1 to 5 parts by weight of a blowing agent and 0.5 to 1.5 parts by weight of a curing agent.

Even more preferably, the urethane resin is formed by polymerizing polytetramethylene ether glycol and isophorone diisocyanate, and may have a weight average molecular weight of 100000 to 120000.

Still more preferably, the acrylic foam may be composed of 100 parts by weight of acrylic resin, 90 to 110 parts by weight of solvent, 0.1 to 5 parts by weight of blowing agent and 0.5 to 1.5 parts by weight of curing agent.

Even more preferably, the acrylic resin may be composed of normal butyl acrylate, 2-ethylhexyl acrylate and acrylic acid.

Even more preferably, the blowing agent has a particle size of 0.001 to 50㎛, may be made of a hydrocarbon coated with acrylonitrile, or polymethyl methacrylate having a particle size of 0.001 to 50㎛.

Even more preferably, the pressure-sensitive adhesive layer is formed to a thickness of 10 to 190㎛, may be composed of 100 parts by weight of the acrylic resin, 90 to 110 parts by weight of the solvent and 0.5 to 1.5 parts by weight of the curing agent.

Even more preferably, the acrylic resin may be composed of normal butyl acrylate, 2-ethylhexyl acrylate and acrylic acid.

As described above, the waterproof double-sided tape having excellent fracture resistance not only has excellent waterproofing performance, but also has an excellent effect of providing a double-sided tape having excellent shock resistance by forming a buffer layer having excellent impact resistance.

1 is an exploded perspective view showing a waterproof double-sided tape having excellent fracture resistance according to one embodiment disclosed.
Figure 2 is an exploded perspective view showing a waterproof double-sided tape excellent in fracture resistance according to another embodiment disclosed.

In the following, preferred embodiments of the present invention and the physical properties of each component will be described in detail, which is intended to explain in detail enough to be able to easily carry out the invention by one of ordinary skill in the art, This does not mean that the technical spirit and scope of the present invention is limited.

The waterproof double-coated tape having excellent fracture resistance disclosed is a base layer 10, a buffer layer 20 formed on one surface of the base layer 10, and upper and lower surfaces of the base layer 10 having the buffer layer 20 formed thereon. It consists of an adhesive layer 30 formed on.

In addition, the waterproof double-coated tape having excellent fracture resistance is the base layer 10, the buffer layer 20 formed on both sides of the base layer 10 and the upper surface of the base layer 10 formed with the buffer layer 20 and It may be made of an adhesive layer 30 formed on the lower surface.

The base layer 10 is a layer of a waterproof double-coated tape having excellent fracture resistance disclosed, and is made of polyethylene terephthalate having a thickness of 25 to 100 micrometers. It distributes the impact to maintain.

When the thickness of the base layer 10 is less than 25 micrometers, the waterproof double-sided tape initiated by an external force may be easily deformed or broken. When the thickness of the base layer 10 exceeds 100 micrometers, the above effect is greatly increased. The thickness of the double-sided tape is excessively increased without improvement, making it difficult to apply to electronic products which are miniaturized and thinned.

The buffer layer 20 is formed on one side or both sides of the base layer 10 to a thickness of 10 to 190㎛, made of urethane foam or acrylic foam, by improving the impact resistance of the disclosed double-sided tape to double-sided tape by external force The shape of the does not deform or layer separation occurs to improve the fracture resistance.

The urethane foam is composed of 100 parts by weight of a urethane resin, 90 to 110 parts by weight of a solvent, 0.1 to 1.5 parts by weight of a blowing agent and 0.5 to 5 parts by weight of a curing agent.

The urethane resin is formed by polymerizing polytetramethylene ether glycol and isophorone diisocyanate, and is preferably formed by polymerizing polytetramethylene ether glycol and isophorone diisocyanate at 7: 3 parts by weight, as described above. The urethane resin formed by polymerizing methylene ether glycol and isophorone diisocyanate at 7: 3 parts by weight shows a weight average molecular weight of 100000 to 120000.

In addition, the acrylic foam is composed of 100 parts by weight of acrylic resin, 90 to 110 parts by weight of solvent, 0.1 to 5 parts by weight of blowing agent and 0.5 to 1.5 parts by weight of curing agent, wherein the acrylic resin is normal butyl acrylate, 2-ethylhexyl acrylate And acrylic acid, preferably 50 parts by weight of normal butyl acrylate, 45 parts by weight of 2-ethylhexyl acrylate, and 5 parts by weight of acrylic acid.

The foaming agent used in the urethane foam or the acrylic foam contains 0.1 to 5 parts by weight based on 100 parts by weight of the urethane resin or the acrylic resin, the particle size is 0.001 to 50㎛, preferably consisting of a hydrocarbon coated with acrylonitrile, SDI (MSH-320) of Commercial & Demand in Industry (SDI) is commercialized. The foaming agent softens acrylonitrile in the shell when heated, and at the same time, the hydrocarbon contained in the foaming agent is gasified. Because of its hollow microspheres, it contributes to the weight reduction of the final foamed product.

In addition, since the foaming agent exhibits excellent elasticity by itself, it not only maintains and improves mechanical strength in the final foamed product, but also forms a fine closed cell structure of a predetermined size in the foamed product to improve the surface property of the foamed product. In addition, it contributes to the shape stability of the foamed product by imparting shrinkage resistance.

In the case of using the blowing agent as described above, the content of the blowing agent is preferably 0.1 to 1.5 parts by weight based on the urethane resin or the acrylic resin.

In addition, polymethyl methacrylate having a particle size of 20 to 40 micrometers may be used as the foaming agent. In the case of using such foaming agent, 3.5 to 5 parts by weight based on 100 parts by weight of urethane resin or acrylic resin is used. It is preferable to be.

In addition, the solvent used for the urethane foam or the acrylic foam is not particularly limited as long as it is applicable to the urethane resin or the acrylic resin, and any one can be used, but methyl ethyl ketone is preferably used.

In addition, the curing agent is not particularly limited as long as it can be used when producing the urethane foam or the acrylic foam, any one can be used, but isocyanate is preferably used.

If the thickness of the buffer layer 20 is less than 10㎛ the effect of improving the fracture resistance of the double-sided tape as described above is insignificant, if the thickness of the buffer layer 20 exceeds 190㎛ of the double-sided tape disclosed as described above While the effect of improving the fracture resistance is not greatly improved, the thickness of the double-sided tape is excessively increased, which is not preferable.

The adhesive layer 30 is formed to a thickness of 10 to 190㎛ on the upper and lower surfaces of the base layer 10, the buffer layer 20 is formed, 100 parts by weight of acrylic resin, 90 to 110 parts by weight of solvent and It consists of 0.5 to 1.5 parts by weight of a hardener, the adhesive layer 20 is formed by strongly adhering the substrate layer 10 and the adherend to prevent the double-sided tape is separated from the adhered by the external force, the double-sided tape is applied It plays a role of giving waterproof performance to electronic products.

At this time, the acrylic resin is preferably composed of normal butyl acrylate, 2-ethylhexyl acrylate and acrylic acid, more preferably using a weight average molecular weight of 600000 to 700000.

In addition, the solvent is not particularly limited as long as it can be applied to an acrylic resin, and any solvent can be used, but methyl ethyl ketone is preferably used, and the curing agent is not particularly limited as long as it can be applied to the acrylic resin. Any may be used but isocyanate is preferred.

If the thickness of the adhesive layer 30 is less than 10㎛, the above effect is insignificant, and if the thickness of the adhesive layer 30 exceeds 190㎛, the above effect is not greatly improved and the thickness of the double-sided tape is excessively increased. It is not desirable because it increases.

The waterproof double-coated tape having excellent fracture resistance formed of the laminated structure is formed of a substrate layer 10 of polyethylene terephthalate having a thickness of 25 to 100 μm, and a urethane resin or an acrylic resin 100 on one or both surfaces of the substrate layer 10. After coating the mixture consisting of parts by weight, 90 to 110 parts by weight of solvent, 0.1 to 5 parts by weight of blowing agent and 0.5 to 1.5 parts by weight of curing agent by using a comma coating method, the coated mixture was dried to a temperature of 100 ° C and Foaming at a temperature to form a buffer layer 20 of 10 to 190㎛ thickness, 100 parts by weight of acrylic resin, 90 to 110 parts by weight of solvent on the upper and lower surfaces of the base layer 10, the buffer layer 20 is formed And it is prepared through the process of forming a pressure-sensitive adhesive layer 30 of 10 to 190㎛ thickness by applying a mixture consisting of 0.5 to 1.5 parts by weight of a curing agent in a comma coating method.

Hereinafter, the physical properties of the double-sided tape manufactured by the method of manufacturing a waterproof double-sided tape having excellent fracture resistance and the manufacturing method will be described with reference to Examples.

<Example 1>

A substrate layer was formed of polyethylene terephthalate having a thickness of 50 micrometers, and 100 parts by weight of a urethane resin (polymerized with 70 parts by weight of polytetramethylene ether glycol and 30 parts by weight of isophorone diisocyanate on one surface of the substrate layer, weight average molecular weight 110000) And a mixture of 100 parts by weight of a solvent (methyl ethyl ketone), 1 part by weight of a blowing agent (MSH-320, SDI Co., Ltd.) and 1 part by weight of a curing agent (isocyanate) were coated to a thickness of 40 micrometers by a comma coating method and dried at 100 ° C. The solvent component was removed, and the coating layer from which the solvent component was removed was foamed at 170 ° C. to form a buffer layer having a thickness of 50 μm, and acrylic resin (normal butyl acrylate 50) was formed on the upper and lower surfaces of the base layer on which the buffer layer was formed. It is made by polymerizing parts by weight, 45 parts by weight of 2-ethylhexyl acrylate and 5 parts by weight of acrylic acid, and has a weight average molecular weight of 70 0000) 100 parts by weight, a mixture of 1 part by weight of a curing agent (isocyanate) and 100 parts by weight of a solvent (methyl ethyl ketone) were coated with a comma coating method to form a pressure-sensitive adhesive layer by forming a pressure-sensitive adhesive layer at a thickness of 75 micrometers. A good waterproof double sided tape was made.

<Example 2>

Proceed in the same manner as in Example 1, but instead of the urethane resin buffer layer made of acrylic foam using an acrylic resin (50 parts by weight of normal butyl acrylate, 45 parts by weight of 2-ethylhexyl acrylate and 5 parts by weight of acrylic acid) To form a waterproof double-sided tape having excellent fracture resistance.

<Example 3>

Proceed in the same manner as in Example 1, by forming a buffer layer of acrylic foam on both sides of the base layer to prepare a waterproof double-sided tape excellent in fracture resistance.

<Example 4>

Proceed in the same manner as in Example 2, by forming a buffer layer on both sides of the base layer to prepare a waterproof double-sided tape excellent in fracture resistance.

Example 5

Proceed in the same manner as in Example 2, one side to form a buffer layer of the urethane foam, the other side to form a buffer layer of acrylic foam to prepare a waterproof double-sided tape excellent in fracture resistance.

<Example 6>

Proceed in the same manner as in Example 1, using a 5 parts by weight of polymethyl methacrylate having a particle size of 30 micrometers as a blowing agent to prepare a waterproof double-sided tape excellent in fracture resistance.

Comparative Example 1

Proceed in the same manner as in Example 1, to prepare a waterproof double-sided tape without applying a blowing agent to the complete layer.

Comparative Example 2

Proceed in the same manner as in Example 2, a waterproof double-sided tape was prepared without applying a blowing agent to the buffer layer.

Comparative Example 3

Proceed in the same manner as in Example 3, a waterproof double-sided tape was prepared without applying a blowing agent to the buffer layer.

<Comparative Example 4>

Proceed in the same manner as in Example 4, a waterproof double-sided tape was prepared without applying a blowing agent to the buffer layer.

The impact resistance, extrusion load, drop separation and waterproof performance of the waterproof double-sided tape prepared through Examples 1 to 6 and Comparative Examples 1 to 4 were measured and shown in Table 1 below.

(However, the impact resistance is placed on the impact sensor, the steel plate and the SUS plate, and the specimens were prepared by cutting the waterproof double-sided tape prepared in Examples 1 to 6 and Comparative Examples 1 to 4 by 10 cm x 10 cm. After attaching the prepared specimens to the upper surface of the SUS plate, 16g steel balls were dropped at a height of 100 cm to measure the impact force through the sensor, and the impact absorption rate was calculated by comparing with the impact amount on the SUS plate to which the specimen was not applied. .

Impact Absorption Rate (%) = (Sheet of SUS Plate without Specimen-Impact of SUS Plate with Specimen) / Impact of SUS Plate without Specimen × 100

In addition, the extrusion load is cut in the waterproof double-sided tape prepared in Examples 1 to 6 and Comparative Examples 1 to 4 to 15.5mm × 15.5mm, then cut the inside 14.8mm × 14.8mm horizontal cut square frame 0.7mm After the sample was prepared in the form of, and the sample was attached onto a polycarbonate (PC) plate of the same size as the horizontal 50 mm × 50 mm × 3.5 mm magnesium (Mg) plate with a hole in the middle 10Φ size, the upper surface of the sample A glass plate 20 mm × 20 mm × 2.8 mm thick was attached to the plate, left at 24 ° C. for 30 minutes, and then pressed with a pointed tip into a 10Φ hole using a universal tensile tester. The load value (kgf) when) is separated. The value thus obtained indicates the degree (resistance) of the double-sided tape to withstand a given force from the outside, and the higher the load value, the better the fracture resistance.

In addition, the drop separation is cut the waterproof double-coated tape prepared in Examples 1 to 6 and Comparative Examples 1 to 4 to 48 mm × 48 mm, then cut the inside into 47.3 mm × 47.3 mm, the square frame having a flesh width of 0.7 mm Prepare a sample in the form, and attach the sample on a 60 mm × 60 mm × 6.5 mm aluminum (Al) plate, and then attach a glass plate of 50 mm × 50 mm × 2.8 mm thick to the upper surface of the sample, After 1.5 minutes left free fall. After the repetitive drop was carried out until the aluminum plate and the glass plate were separated, the number of times of separation and the degree of remaining of the adhesive on the separation surface were measured to determine the% of the adhesive residue. In the aluminum plate or the glass plate, when the pressure-sensitive adhesive on the tape is present on only one side, the residue was marked as 0%. When the tape was broken and the adhesive was present on both sides of the aluminum plate and the glass plate, the residue was marked as 100%. The higher the number of separations and the closer the residue is to 0%, the better the fracture resistance of the tape.

Water resistance (Waterproof) performance of cutting the waterproof double-sided tape prepared in Examples 1 to 6 and Comparative Examples 1 to 4 to 48 mm × 48 mm, cut the inside 47.3 mm × 47.3 mm and cut the inside of the square frame shape of 0.7 mm Samples of were prepared. The prepared sample was attached on a polycarbonate (PC) plate of the same size as a magnesium (Mg) plate having a width of 60 mm × 60 mm × 6.5 mm, and then a 50 mm × 50 mm × 2.8 mm glass plate was placed on the upper surface of the sample. After adhering and leaving at 72 ° C. for 72 hours, the sample was placed in a water-filled 2m deep water tank, and after 144 hours, the samples were collected to check for leakage of water. Leaksed samples are labeled Pass and leaked samples are labeled NG.)

TABLE 1

As shown in Table 1 above, the waterproof double-coated tape having excellent fracture resistance through the disclosed Examples 1 to 6 has superior impact resistance, extrusion load, and drop separation performance compared to the waterproof double-coated tape prepared through Comparative Examples 1 to 4. It can be seen that excellent.

Therefore, the disclosed waterproof double-sided tape having excellent fracture resistance can provide a double-sided tape showing excellent fracture resistance by forming a buffer layer having excellent waterproof performance and excellent impact resistance.

10; Substrate layer
20; Buffer layer
30; Adhesive layer

Claims (11)

Base layer;
A buffer layer formed on one surface of the base layer; And
Waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of; adhesive layer formed on the upper surface and the lower surface of the base layer on which the buffer layer is formed.
Base layer;
A buffer layer formed on both sides of the substrate layer; And
Waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of; adhesive layer formed on the upper surface and the lower surface of the base layer on which the buffer layer is formed.
The method according to claim 1 or 2,
The base layer is a waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of polyethylene terephthalate of 25 to 100㎛.
The method according to claim 1 or 2,
The buffer layer is a waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of urethane foam or acrylic foam having a thickness of 10 to 190㎛.
The method according to claim 4,
The urethane foam is 100 parts by weight of urethane resin, 90 to 110 parts by weight of solvent, 0.1 to 5 parts by weight of the blowing agent and 0.5 to 1.5 parts by weight of the curing agent excellent waterproof double-sided tape.
The method according to claim 5,
The urethane resin is formed by polymerizing polytetramethylene ether glycol and isophorone diisocyanate, and a waterproof double-sided tape having excellent fracture resistance, characterized in that the weight average molecular weight is 100000 to 120000.
The method according to claim 4,
The acrylic foam is a waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of 100 parts by weight of acrylic resin, 90 to 110 parts by weight of solvent, 0.1 to 5 parts by weight of blowing agent and 0.5 to 1.5 parts by weight of curing agent.
The method according to claim 7,
The acrylic resin is a waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of normal butyl acrylate, 2-ethylhexyl acrylate and acrylic acid.
The method according to claim 5,
The blowing agent has a particle size of 0.001 to 50㎛, waterproof double-coated tape made of a hydrocarbon coated with acrylonitrile, or made of polymethyl methacrylate having a particle size of 0.001 to 50㎛. .
The method according to claim 1 or 2,
The adhesive layer is formed of a thickness of 10 to 190㎛, waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of 100 parts by weight of acrylic resin, 90 to 110 parts by weight of solvent and 0.5 to 1.5 parts by weight of a curing agent.
The method according to claim 10,
The acrylic resin is a waterproof double-sided tape having excellent fracture resistance, characterized in that consisting of normal butyl acrylate, 2-ethylhexyl acrylate and acrylic acid.

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