KR102003268B1 - Waterproof tape and method of fabricating of the same - Google Patents

Abstract

A waterproof tape is provided. Wherein the waterproof tape comprises a base substrate having a plurality of closed pores and a coating layer coated on both sides of the base substrate, the coating layer comprising an absorbent clay mixed with an acrylic resin and having montmorillonite, The content of the absorbent clay in the coating layer may be 2 to 15 wt%.

Description

Waterproof tape and method of fabricating the same

The present invention relates to a waterproof tape and a manufacturing method thereof, and more particularly, to a waterproof tape including an absorbent clay having montmorillonite and a method of manufacturing the waterproof tape.

In recent years, not only the waterproof level for premium IT equipment has increased, but also some waterproof function has been applied to low-end IT equipment. In addition, as more users are enjoying external activities while using IT devices, the waterproof function is becoming an essential function of IT devices.

Therefore, it is necessary to research and develop waterproof tape technology which has excellent waterproof function and is easy to apply to IT equipment.

Korean Patent Registration No. 10-1638077 discloses a method of forming an impact resistant filler layer including an acrylic binder and an impact resistant filler on an upper surface of a base material layer and an impact resistant filler including hollow fine particles and being disposed between the panel module and the liquid crystal module of the touch screen, Discloses a double-sided tape for a touch screen panel that exhibits good tackiness even in thickness, and is excellent in impact resistance and waterproofness.

Korean Patent Laid-Open Publication No. 10-2014-0058812 discloses a method of forming a plurality of holes in a protective film exposed portion of a mobile device in order to prevent liquid from penetrating into an exposed portion of a mobile device, And a protective film is formed on the hole by tension.

SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproof tape having improved waterproof properties and a method of manufacturing the same.

Another technical problem to be solved by the present invention is to provide a waterproof tape having a simplified manufacturing process and a manufacturing method thereof.

Another technical problem to be solved by the present invention is to provide a waterproof tape having a reduced manufacturing cost and a manufacturing method thereof.

The technical problem to be solved by the present invention is not limited to the above.

In order to solve the above technical problems, the present invention provides a waterproof tape.

According to one embodiment, the waterproof tape comprises: a base substrate having a plurality of closed pores; and a coating layer coated on both sides of the base substrate, wherein the coating layer is mixed with an acrylic resin, the montmorillonite Absorbing clay, and the content of the absorbent clay in the coating layer may be 2 to 15 wt%.

According to one embodiment, the absorbent clay may comprise particles having a diameter of 5 mu m or less.

According to another aspect of the present invention, there is provided an electronic device including a waterproof tape according to an embodiment of the present invention.

According to another aspect of the present invention, there is provided a method of manufacturing a waterproof tape.

According to one embodiment, the manufacturing method of the waterproof tape comprises the steps of preparing an absorbent clay having montmorillonite, mixing the absorbent clay with an acrylic resin to prepare a coating solution, Coating the coating solution to form a coating layer on both sides of the base substrate, and drying the coating layer.

According to one embodiment, the content of the absorbent clay in the coating layer may be 2 to 15 wt%.

According to one embodiment, preparing the absorbent clay may include activating the absorbent clay by dry ball milling the absorbent clay and the reactant.

According to one embodiment, in the dry ball milling process, the content of the reactant may be 6 to 7 wt%.

According to one embodiment, the step of mixing the absorbent clay with an acrylic resin to prepare the coating solution may be performed with a planetary mixer in a vacuum state.

A waterproof tape according to an embodiment of the present invention includes a coating layer coated on both sides of a base substrate having a plurality of waste holes, and the coating layer may include an absorption clay having montmorillonite. Accordingly, the waterproof tape can efficiently block and absorb moisture introduced from the outside.

Further, the waterproof tape according to the embodiment of the present invention can be manufactured by a simple method of mixing the absorbent clay having montmorillonite with an acrylic resin to prepare a coating solution, and coating the coating solution on the base substrate and drying have.

1 is a view for explaining a method of manufacturing a waterproof tape according to an embodiment of the present invention.
2 is a view for explaining a waterproof tape according to an embodiment of the present invention.
FIG. 3 is an enlarged view of FIG. 2 A. FIG.
4 is a diagram for explaining the hydration expansion of the absorbent clay in the cot layer of the waterproof tape according to the embodiment of the present invention.
5 is a graph showing the degree of hydration expansion of the activated absorbent clay prepared according to Examples 3-1 to 3-10 of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Further, in the drawings, the thicknesses of the films and regions are exaggerated for an effective explanation of the technical content.

Also, while the terms first, second, third, etc. in the various embodiments of the present disclosure are used to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. Thus, what is referred to as a first component in any one embodiment may be referred to as a second component in another embodiment. Each embodiment described and exemplified herein also includes its complementary embodiment. Also, in this specification, 'and / or' are used to include at least one of the front and rear components.

The singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprises "or" having "are intended to specify the presence of stated features, integers, Should not be understood to exclude the presence or addition of one or more other elements, elements, or combinations thereof.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a view for explaining a waterproof tape according to an embodiment of the present invention, and Fig. 3 is an enlarged view of the waterproof tape according to the embodiment of the present invention. And Fig. 4 is a view for explaining the hydration expansion of the absorbent clay in the cot layer of the waterproof tape according to the embodiment of the present invention.

Referring to Figs. 1 to 4, an absorbent clay having montmorillonite is prepared (S110). According to one embodiment, the absorbent clay may be bentonite. Specifically, the absorbent clay may be calcium-based bentonite.

The absorbent clay having montmorillonite may have a layered structure. The absorbent clay absorbs moisture, and the layered structure of the absorbent clay can be hydrated and expanded as shown in Fig.

The absorbent clay may comprise particles of micro-sized diameter. If the absorbent clay is a particle having a diameter of more than 5 占 퐉, the surface roughness value of the waterproof tape produced using the absorbent clay is increased as described later, so that it is utilized in a small mobile device requiring precise assembly It is not easy. Thus, according to one embodiment, the absorbent clay may comprise particles having a diameter of 5 mu m or less.

Preparing the absorbent clay having particles of micro-sized diameter comprises the steps of preparing a raw clay, wet-milling the raw clay, applying pressure to the wet-milled raw clay, aggregating and drying the aggregate , And dry-milling the agglomerates. Accordingly, the absorbent clay can have particles of micro-sized diameter, and the diameter of the particles can be made uniform.

According to one embodiment, preparing the absorbent clay may include activating the absorbent clay by dry ball milling the absorbent clay (e.g., calcium based bentonite) and the reactants. For example, the reaction material may be sodium carbonate. In the dry ball milling process, the content of the reaction material may be 6 to 7 wt%. Thus, the water absorption property of the activated absorbent clay can be improved.

When the absorbent clay is calcium-based bentonite as described above, water-swellability is remarkably low as compared with sodium-based bentonite, but the water-absorbing property may be low. Specifically, calcium-based bentonite can be hydrated and expanded about 3 times, and sodium-based bentonite can hydrated and expanded about 15 times. Accordingly, as described above, when the absorbent clay is calcium-based bentonite, the moisture absorption property can be improved by the activation process using the reaction material.

The absorbing clay may be mixed with an acrylic resin to prepare a coating solution (S120). According to one embodiment, the absorbent clay and the acrylic resin may be mixed in a vacuum state using a planetary mixer.

Mixing the absorbent clay with the acrylic resin comprises the steps of: providing a solvent to the absorbent clay to wet the absorbent clay with the solvent; and mixing the absorbent clay soaked with the solvent with the acrylic resin . ≪ / RTI > For example, the solvent may be selected from the group consisting of toluene, tetrahydrofuran, methyl ethyl ketone, ethyl acetate, n-methyl pyrolidone, PMA, DBE (Dibasic ester) ), And CYCLOHEXANE (Cyclohexane).

According to one embodiment, the solvent may be vaporized and the vaporized solvent may be provided to the absorbent clay. Thus, the solvent can be uniformly provided to the absorbent clay.

As described above, according to one embodiment, after the absorbent clay is wetted with the solvent, it can be mixed with the acyl resin. If the solvent is added after the absorption clay is mixed with the acrylic resin or when the absorption clay is mixed together with the acrylic resin and the solvent, A large amount of bubbles may remain. When a large amount of bubbles are contained in the coating solution, it is not easy to remove the bubbles in the defoaming process, and it is not easy to uniformly disperse the absorbing clay due to a large amount of bubbles. Further, when the waterproof tape is produced as described later using the coating solution containing a large amount of bubbles, the waterproof property of the waterproof tape may be deteriorated. Further, as described above, when the absorbent clay is a particle having a micro-diameter size, it is not easy to uniformly mix it with the acrylic resin.

However, as described above, according to the embodiment of the present invention, after the solvent is provided to the absorbent clay, it can be mixed with the acrylic binder. Accordingly, the dispersion of the absorbent clay in the coating solution is improved, and the bubbles between the particle surfaces of the absorbent clay and the particles can be minimized. As a result, a waterproof tape having improved waterproof property and a manufacturing method thereof can be provided.

A base substrate 110 having a plurality of closed pores is prepared. For example, the base substrate 110 may be a PE form. The base substrate 110 may include a plurality of waste holes as shown in FIG.

The coating layer 120 may be formed on both surfaces of the base substrate 110 by coating the coating solution on the base substrate 110 (S130). According to one embodiment, the coating layer 120 may be formed by a tape casting method.

When the content of the absorbent clay in the coating layer 120 of the waterproof tape exceeds 15 wt%, when the waterproof tape is used for an electronic device due to excessive hydration expansion of the absorbent clay, . Accordingly, according to the embodiment of the present invention, the content of the absorbent clay in the coating layer 120 can be controlled to 15 wt% or less.

Thereafter, the coating layer 120 may be dried (S140).

As described above, according to the embodiment of the present invention, the coating solution is prepared by mixing the absorbent clay having montmorillonite and the acrylic resin, and coating the coating solution on the base substrate 110, When a waterproof tape according to an embodiment of the present invention is used in a portable electronic device, a waterproof tape may be formed on both sides of the waterproof tape 110 by a method of forming the coating layer 120. [ With the absorbent clay, it is possible to effectively prevent moisture from entering the interior of the portable electronic device from the outside.

The waterproof tape according to the embodiment of the present invention can be applied to various parts such as front and rear kerchers, hometown keys, antennas, and touch screen panels of portable electronic devices.

Hereinafter, specific experimental examples and results of the waterproof tape and the manufacturing method thereof according to the embodiment of the present invention described above will be described.

Production of waterproof tape and measurement of surface roughness according to Examples 1-1 to 1-6

PE foam was prepared as a base substrate, and bentonite having particle diameters of 2 占 퐉, 5 占 퐉, 8 占 퐉, 10 占 퐉, 15 占 퐉 and 20 占 퐉 was prepared as an absorbent clay. The bentonite was supplied to toluene and then mixed with an acyl resin to prepare a coating solution. The coating solution was coated on PE foam to prepare waterproof tapes according to Examples 1-1 to 1-6.

Surface roughness values of the waterproof tapes according to Examples 1-1 to 1-6 were measured using a Surfcorder ET4000 manufactured by Kosaka.

Diameters and surface roughness values of the bentonite particles used in Examples 1-1 to 1-6 are summarized in Table 1 below.

division Average particle diameter Surface roughness Example 1-1 2 탆 0.027 탆 Examples 1-2 5 탆 0.027 탆 Example 1-3 8 탆 0.030 탆 Examples 1-4 10 탆 0.035 탆 Examples 1-5 15 탆 0.037 m Examples 1-6 20 탆 0.051 m

As can be seen from Table 1, when the average diameter of the bentonite particles is 2 to 15 占 퐉 according to Examples 1-1 to 1-5, the average diameter of the bentonite particles is 20 占 퐉 , It can be confirmed that the surface roughness value is remarkably low. That is, when the mean diameter of the bentonite particles is 20 占 퐉 according to the embodiment 1-6, the particles coated with the acrylic resin cohere to each other so that the particles are easily coarsened, whereby the surface roughness value of the waterproof tape is remarkably , Respectively.

Consequently, it can be confirmed that controlling the particle size of the absorbent clay to 15 μm or less is an efficient method of manufacturing a waterproof tape with reduced surface roughness.

Production of waterproof tapes according to Examples 2-1 to 2-6

PE foam was prepared as a base material, and bentonite having an average particle diameter of 8 mu m was prepared as an absorbent clay. The bentonite was supplied to toluene and then mixed with an acyl resin to prepare a coating solution, and the content of bentonite in the coating solution was varied. The prepared source solution was coated on PE foam to form a coating layer of 50 mu m on the PE foam. The waterproof tape according to Examples 2-1 to 2-6 having different contents of bentonite in the coating layer of the waterproof tape .

Preparation of waterproof tape according to Comparative Example 1

A PE foam was prepared as a base material, and a waterproof tape according to Comparative Example 1 in which a PE foam was coated with an acrylic resin was prepared.

The waterproof tapes according to Examples 2-1 to 2-6 and Comparative Example 1 described above can be arranged as shown in [Table 2] below.

division Absorbing clay wt% Example 2-1 2wt% Example 2-2 7wt% Example 2-3 12wt% Examples 2-4 15wt% Example 2-5 20wt% Examples 2-6 25wt% Comparative Example 1 -

Evaluation of waterproof properties of waterproof tapes according to Examples 2-1 to 2-6

For testing the waterproof property of the waterproof tape according to Examples 2-1 to 2-6 described above, a test ITO cover glass and a test display panel model were prepared.

The waterproof tape according to Examples 2-1 to 2-6 described above was attached between the ITO cover glass for test and the test display panel model, and the IPX7 waterproof grade (once immersed for 30 minutes at 1 m depth) and IPX8 The waterproof grade (5 times immersion for 30 minutes at 1 m depth) was tested. The IPX7 waterproof grade test results were measured as shown in [Table 3] below, and the IPX8 waterproof grade test results were measured as shown in [Table 4] below.

division Absorbing clay wt% Inundation (IPX7) Example 2-1 2wt% X Example 2-2 7wt% X Example 2-3 12wt% X Examples 2-4 15wt% X Example 2-5 20wt% X Examples 2-6 25wt% O Comparative Example 1 - O

division Absorbing clay wt% Inundation (IPX8) Example 2-1 2wt% X Example 2-2 7wt% X Example 2-3 12wt% X Examples 2-4 15wt% X Example 2-5 20wt% O Examples 2-6 25wt% O Comparative Example 1 - O

As can be seen from [Table 3] and [Table 4], when there is no absorbent clay in the coating layer of the waterproof tape according to Comparative Example 1, and when the content of the absorbent clay in the coating layer of the waterproof tape is 25 wt %, It was confirmed to be flooded in the IPX7 waterproof grade test. When the content of the absorbent clay in the coating layer of the waterproof tape is 20% by weight and 25% by weight in the case of Examples 2-5 and 2-6 according to Comparative Example 1, It has been confirmed that it has been flooded in the IPX8 watertight grade test. On the other hand, according to Examples 2-1 to 2-4, when the content of the absorbent clay in the coating layer of the waterproof tape was 2 to 15 wt%, it was confirmed that the IPX7 waterproof grade test was not immersed in the IPX8 waterproof grade test as well as the test .

In other words, it is an efficient method to improve the waterproof property by forming a coating layer including the absorbent clay on the PE foam. When the amount of the absorbent clay in the coating layer is excessively large (exceeding 15 wt%), It can be seen that penetration occurs because the gap between the cover glass and the test display panel model is separated.

As a result, it can be seen that controlling the content of the absorbent clay in the coating layer of the waterproof tape to 2 to 15 wt% is an effective method for improving the waterproof property of the waterproof tape.

Production of activated absorbent clay according to Examples 3-1 to 3-10

Calcium-based bentonite was prepared and dried at 110 캜 in a dryer. Then, sodium carbonate was prepared as a reactant to activate calcium - based bentonite, and a ball mill process was performed on calcium - based bentonite and sodium carbonate while adjusting the sodium carbonate content to 1 to 10 wt%. Specifically, they were mixed at 120 rpm for 5 hours.

The activated absorbent clay according to Examples 3-1 to 3-10 described above can be summarized as shown in Table 5 below.

division Reactant wt% Example 3-1 1wt% Example 3-2 2wt% Example 3-3 3wt% Example 3-4 4wt% Example 3-5 5 wt% Examples 3-6 6wt% Examples 3-7 7wt% Examples 3-8 8wt% Examples 3-9 9wtt% Examples 3-10 10wt%

Measurement of Hydration Expansion of Activated Absorbent Clay According to Examples 3-1 to 3-10

5 is a graph showing the degree of hydration expansion of the activated absorbent clay prepared according to Examples 3-1 to 3-10 of the present invention.

Referring to FIG. 5, the degree of hydration expansion of the activated absorbent clay prepared according to Examples 3-1 to 3-10 described above was measured. The measurement results are shown in Table 6 below and Fig.

division Reactant wt% Degree of hydration expansion (ml / 2g) Example 3-1 1wt% 9 Example 3-2 2wt% 12 Example 3-3 3wt% 12.5 Example 3-4 4wt% 14.5 Example 3-5 5 wt% 15 Examples 3-6 6wt% 17.5 Examples 3-7 7wt% 17.5 Examples 3-8 8wt% 14.5 Examples 3-9 9wtt% 13 Examples 3-10 10wt% 13

As can be seen from [Table 6] and FIG. 5, when 1 to 5% by weight of sodium carbonate was added as a reaction material in Examples 3-1 to 3-5 and in Examples 3-8 to 3-10 The addition of sodium carbonate as a reactant in an amount of 6 to 7 wt% according to Example 3-6 and Example 3-7, as compared with the case of adding 8 to 10 wt% of sodium carbonate as a reactant, Can be confirmed. That is, it can be confirmed that, when sodium carbonate is mixed with a small amount of calcium-based bentonite at a concentration of 6 to 7 wt%, calcium-based bentonite can be activated to improve water absorption.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

110: base substrate
120: Coating layer

Claims (8)

A base substrate having a plurality of closed pores; And
A coating layer coated on both sides of the base substrate,
Said coating layer being mixed with an acrylic resin and comprising an absorbent clay having montmorillonite,
Wherein said absorbent clay comprises bentonite comprising particles having a diameter of 2 to 15 占 퐉.
The method according to claim 1,
Wherein said absorbent clay is activated by mixing calcium-based bentonite with sodium carbonate.
An electronic device comprising the waterproof tape according to claim 1.
Preparing an absorbent clay having montmorillonite;
Mixing the absorbent clay with an acrylic resin to prepare a coating solution;
Coating a base material having a plurality of waste holes with the coating solution to form a coating layer on both sides of the base material; And
And drying the coating layer,
Wherein the absorbent clay is calcium-based bentonite,
The step of preparing the absorbent clay comprises:
Preparing sodium carbonate as a reaction material; And
Milling the absorbent clay and the reaction material by dry ball milling to activate the absorbent clay.
Preparing an absorbent clay having montmorillonite;
Mixing the absorbent clay with an acrylic resin to prepare a coating solution;
Coating a base material having a plurality of waste holes with the coating solution to form a coating layer on both sides of the base material; And
And drying the coating layer,
The step of preparing the coating solution comprises:
Providing a solvent to the absorbent clay; And
And mixing the absorbent clay provided with the solvent with the acrylic resin,
The step of preparing the absorbent clay comprises:
And dry-ball milling a reaction material comprising the absorbent clay and sodium carbonate to activate the absorbent clay,
Wherein the content of the reactive material in the dry ball milling step is 6 to 7 wt%.
The method according to claim 4 or 5,
Wherein the content of the absorbent clay in the coating layer is 2 to 15 wt%.
delete The method according to claim 4 or 5,
Wherein the step of mixing the absorbent clay with an acrylic resin to prepare the coating solution comprises performing the treatment with a planetary mixer in a vacuum state.

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