KR20180027750A - Antistatic transparent protection film having grating pattern on surface and preparation method thereof - Google Patents

Abstract

The present invention relates to a transparent antistatic protection film having a surface lattice pattern, which protects contents from a physical impact, prevents contamination caused by charging effects, and secures certain transparency, and a method of manufacturing the same. More specifically, the transparent antistatic protection film comprises: a first layer having a lattice pattern, composed of a first polymer resin and a conductive linear filler disposed in the first polymer resin, the conductive linear filler including a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT) or a metal nanowire; and a second layer provided on a lower side of the first layer and composed of a second polymer resin having compatibility or adhesiveness with the first polymer resin. The transparent antistatic protection film further comprises a third layer provided on a lower side of the second layer having the same composition as the first layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent antistatic protective film having a surface lattice pattern,

The present invention relates to a transparent antistatic protective film having a surface lattice pattern that protects contents from physical impact while preventing contamination due to a charging effect and ensuring transparency. More specifically, a conductive linear filler comprising a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT), or a metal nano-wire A first layer having a lattice pattern dispersed in the first polymer resin; A second layer made of a second polymer resin having compatibility or adhesion with the first polymer resin or a second layer made of a second polymer resin having a composition and pattern identical to those of the first layer, And a third layer, and a method for manufacturing the same. [0002] The present invention relates to a transparent antistatic protective film having a surface lattice pattern.

Antistatic protective film is generally made to be used as a packaging material for various display-related devices, and is a functional protective film for preventing the possibility of dust contamination due to the surface charging effect in addition to the primary purpose of preventing direct contact with external materials .

The anti-static protective film has a surface resistance of less than a certain level (10 ¹¹ Ω / cm ² ), thereby leaking the surface charge that may be generated in the inside of the article, and causing the fine particles .

Conventional antistatic protective films can be roughly classified into three types. The first is a method of coating a packaging material with a conductive material, the second is a method of dispersing a surfactant capable of forming a water film, and the third is a method of producing a composite containing a conductive filler (filler).

First, the method of coating a packaging material with a conductive material may have an excellent antistatic effect, but there is a problem that a coating material on the surface may contaminate articles, and a subsequent process for coating is required. Next, the surfactants that form the water film are sensitive to external humidity conditions and may have difficulty controlling the surface migration process of the surfactant in the manufacturing process. Finally, prior art related to a composite containing a conductive filler is disclosed in Korean Patent Publication No. 2011-0024984 for an antistatic high refractive index hard coat layer containing carbon nanotubes (CNT) formed on a hard coat layer, Korean Patent Laid-Open No. 2005-0011867 discloses a method for forming a conductive film using a tube and metal nanoparticles. However, in the case of such a conventional technique, when a conventional material and a process method are used to obtain a desired level of surface resistance, And the stiffness of the packaging material is greatly increased, resulting in a problem that it may exceed the level suitable for use as a packaging material.

In addition, in the case of such an antistatic protective film, the production method is simple and the content of the conductive substance is increased, thereby easily achieving the desired antistatic effect. However, since the added conductive material reduces the transparency of the antistatic protective film And it is impossible to visually identify the articles.

Korea Patent Publication No. 2011-0024984 Korean Patent Publication No. 2005-0011867

The present invention has been developed in order to solve the above problems, and it is an object of the present invention to provide a conductive linear filler or filler having conductivity and having a large aspect ratio of length / length or diameter / It is an object of the present invention to provide a protective film which can be manufactured in the form of a film and which can confirm the articles inside through a transparent region in the production of the laminated film and at the same time has antistatic property.

In order to solve the above problems, the present invention includes a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT), or a metal nano-wire A first layer having a lattice pattern in which a conductive linear filler is dispersed in a first polymer resin; And a second layer made of a second polymer resin having a compatibility or adhesion with the first polymeric resin, the second layer being formed on the lower side of the first layer, and a transparent antistatic protective film having a surface lattice pattern, to provide.

Also, a conductive linear filler comprising a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT), or a metal nano-wire, Preparing a first layer film composition to be dispersed in the polymer resin; The first layer film composition is formed into a fiber form and then woven into a lattice pattern or a first layer film composition is formed into a film through a uniaxial or biaxial extrusion process and then a first Layer film manufacturing step; A second layer film production step of producing a film using a second polymer resin having compatibility or adhesion with the first polymer resin; The first layer film and the second layer film are arranged vertically, or the first layer film is relocated to the lower part of the first layer film and the second layer film disposed upside and down, and the laminate film is produced through the thermocompression process There is provided a method for producing a transparent antistatic protective film having a surface lattice pattern including a film production step.

The transparent antistatic protective film having a surface lattice pattern according to the present invention can be produced by successively dispersing a conductive linear filler having a low axial ratio by a biaxial extrusion process and then finishing it with a fiber, It has an advantage of showing an antistatic effect when it is attached in a lattice pattern on the surface of the antistatic protective film and confirming the articles through a transparent region of the lattice pattern.

In addition, the surface resistance can be determined by adjusting the density of the conductive linear filler having a large axial ratio and the density of the lattice pattern included in the lattice pattern, and the polymeric resin (high density polyethylene) mixed with the conductive linear filler having a large axial ratio, Due to the compatibility between the layered polymer (low density polyethylene), the manufacturing cost can be lowered by manufacturing a multilayer structure film which is tightly adhered using only a thermocompression process without using an adhesive in an environmentally friendly and simplified process .

1 is a schematic view showing the shape of a transparent antistatic protective film according to an embodiment of the present invention.
2 is a top view of a transparent antistatic protective film according to an embodiment of the present invention.
FIG. 3 shows various apertures applied to the upper and lower layers of the transparent antistatic protective film according to an embodiment of the present invention. (a) where a is the length of one side of the space in the case of a square pattern or woven film, (b) where a is the radius of the space circle, and (c) a is the length of one side of the space triangle. The black part is the side containing the conductive conductor.

Hereinafter, the present invention will be described in detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

In order to solve the above-described problems, the present invention includes a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT), or a metal nano-wire A first layer having a lattice pattern in which a conductive linear filler is dispersed in a first polymer resin; And a second layer made of a second polymer resin which is formed on the lower side of the first layer and has compatibility or adhesion with the first polymer resin.

The transparent protective antistatic film having a surface lattice pattern according to an embodiment of the present invention may further include a third layer below the second layer, the third layer having the same composition and pattern as the first layer.

In the transparent protective antistatic protective film having a surface lattice pattern according to an embodiment of the present invention, the first layer having the lattice pattern may be formed by dispersing a conductive linear filler in a first polymer resin, molding the first linear polymer in a fiber form, Or a conductive linear filler may be dispersed in the first polymer resin, molded into a film shape, and then formed into a predetermined repetitive perforation to form a lattice pattern.

In the transparent antistatic protective film having a surface lattice pattern according to an embodiment of the present invention, the conductive linear filler may be contained in an amount of 0.5 to 1.0 wt% based on the weight of the first polymer resin.

In the case of a transparent antistatic protective film having a surface lattice pattern according to an embodiment of the present invention, the thickness of the second layer may be 40 to 70% of the thickness of the entire film.

In the transparent antistatic protective film having a surface lattice pattern according to an embodiment of the present invention, the first polymer resin and the second polymer resin have a density of 0.941 g / cm < ³ > Density polyethylene having a density of 0.910 to 0.925 g / cm < ³ > or a low-density polyethylene having a density of 0.910 to 0.925 g / cm < ³ >.

In the present invention, a conductive linear filler including a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT), or a metal nano-wire To be dispersed in the first polymer resin; The first layer film composition is formed into a fiber form and then woven into a lattice pattern or a first layer film composition is formed into a film through a uniaxial or biaxial extrusion process and then a first Layer film manufacturing step; A second layer film production step of producing a film using a second polymer resin having compatibility or adhesion with the first polymer resin; The first layer film and the second layer film are arranged vertically, or the first layer film is relocated to the lower part of the first layer film and the second layer film disposed upside and down, and the laminate film is produced through the thermocompression process There is provided a method for producing a transparent antistatic protective film having a surface lattice pattern including a film production step.

In the method for producing a transparent antistatic protective film having a surface lattice pattern according to an embodiment of the present invention, the conductive linear filler may be contained in an amount of 0.5 to 1.0 wt% based on the weight of the first polymer resin.

In the method for manufacturing a transparent antistatic protective film having a surface lattice pattern according to an embodiment of the present invention, the thickness of the second layer film may be 40 to 70% of the thickness of the entire film.

In the method for producing a transparent antistatic protective film having a surface lattice pattern according to an embodiment of the present invention, the first polymer resin and the second polymer resin may be a high density polyethylene having a density of 0.941 g / cm ³ or more or a density of 0.910 to 0.925 g / cm < ³ >, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. In particular, the technical idea of the present invention and its core structure and action are not limited by this. In addition, the content of the present invention can be implemented by various other types of equipment, and is not limited to the embodiments and examples described herein.

The transparent antistatic protective film having a surface lattice pattern according to the present invention can have a first lattice pattern including a conductive linear filler having a large axial ratio and a polymer resin (e.g., high density polyethylene) and a second lattice pattern including a first lattice pattern Layer film having a two-layer structure composed of a transparent polymer (e.g., a low-density polyethylene) film compatible with the polymer resin of the layer, and when an antistatic function is required in both the inside and outside of the film, Layer multi-layer structure in which the lower second grating pattern film is joined with the same grating film as the pattern.

In the present invention, the first lattice pattern film is produced by mixing and stirring a polymeric resin having a density similar to that of the conductive linear filler having a large axial ratio or having a surface affinity and being dispersed in a uniaxial or an outward extruder, A cloth-like film having a lattice shape is produced by weaving a roughly extruded fiber so as to have a large internal space (Fig. 1), or extruded into a film form when extruded, 3) A film having a certain pattern such that a large amount of internal space exists as in the case of the previously woven film is produced, and then a transparent polymer film having good compatibility with the polymer resin of these grid pattern films is laminated on the one- To thereby produce a transparent antistatic protective film on which the package can be seen when the film is packed in a protective film ≪ / RTI >

The present invention relates to a transparent antistatic protective film, which is a polymeric resin such as a conductive linear filler having a large axial ratio and a first lattice pattern layer thin film formed in a lattice form after it is evenly dispersed, or a transparent polymer film having compatibility as a lower layer Layer structure or a three-layer structure in which a film having a lattice pattern of an upper layer is bonded to the lower layer below when antistatic properties are required.

The conductive linear filler having a large axial ratio included in the first grid pattern and the lower second grid pattern of the present invention may be processed into a fibrous form after being stirred with a polymer resin through a biaxial extrusion process and then processed or weaved to have a grid pattern The film is extruded in the form of a film after stirring, and then the film is subjected to a perforation process so as to have a predetermined pattern, thereby forming a film having a constant spatial pattern.

In addition, the content of the conductive linear filler having a large axial ratio included in the first grid pattern and the second grid pattern is a low level in the range of 0.5 to 1 wt%, and thus, And the thermal compression process between the inner layer and the inner layer is not hindered.

The transparent antistatic protective film of the present invention maintains the antistatic effect on the level of the conventional antistatic protection film and replaces the opaque antistatic layer with a film having a lattice pattern or perforations so that the opposed object So as to ensure transparency so as to confirm the articles in the antistatic film.

In addition, the surface resistance can be easily determined by adjusting the density of the conductive linear filler having a large axial ratio included in the lattice pattern and the density of the lattice pattern. In other words, as shown in FIG. 3, in the case of a perforated film or a woven fabric or cloth type film, it is possible to reduce the amount of the antistatic film than an antistatic film having a total surface resistance by adjusting the lattice spacing or the perforation size . For example, in the case of a pore having a regular interval, when the width of the pore is H, the area showing the sheet resistance is 1-H for a film having a lattice pattern or a square pore, wherein the sheet resistance of the entire area is And R / (1-H) when the sheet resistance is R. Therefore, the area H can be adjusted so that this resistance value becomes a desired sheet resistance value. For example, if the desired sheet resistance value is 10 ¹¹ Ω / cm ² and the sheet resistance of the nonperforated film is 10 ⁹ Ω / cm ^2, then 1-H = 10 ^-2 Ω / cm ² . So that a grid pattern consisting of very thin lines can be used. This can easily be calculated in the case of circular or triangular patterns as shown in b or c in FIG. In the case of the circle, 3.14 * a * a = 0.99, so a = 0.56. In the case of the triangle, a is 0.235 because √3 / 4 * a * a = 1-0.99 = 0.01. The more space, the higher the transparency can be secured, but the optimum porosity ratio should be set within the range that the film or the woven film does not break.

On the other hand, since the transparent antistatic protective film of the present invention has compatibility between the grid pattern layer made of the conductive linear filler and the polymer resin having a large axial ratio and the transparent polymer film of the inner intermediate layer, only the thermocompression process A transparent antistatic protective film having a multiple structure can be produced. In the transparent antistatic protective film of the present invention, the thickness ratio of the first lattice pattern, the inner layer, and the second lattice pattern can be adjusted to have a required surface resistance, thereby saving the film of the antistatic layer.

 Another advantage of the transparent antistatic protective film of the present invention is that a large amount of space is created due to perforations or lattice patterns in the surface layer, thereby reducing the area for the conductive antistatic property, thereby reducing the amount of the conductive material used. There is an advantage that it can be economically manufactured by reusing it.

The biaxial extrusion process refers to a process in which stirring and molding operations are continuously performed using a twin screw extruder. Two rotating screws located in the extruder cylinder melt and mix the material and produce the result that the material is discharged through the nozzle by the pressure applied to the material. When a specific mold is connected to the nozzle, the result corresponding to the shape of the mold can be obtained, but if not, a continuous fiber-shaped product is obtained from the nozzle. By controlling the rate at which the fiber-form product is recovered, the thickness of the fiber can be determined by plastic deformation of the uncooled product. The thermocompression process refers to a process in which two or more polymers are bonded by applying a high pressure at a process temperature lower than the melting point of the polymer used. In this case, when the compatibility between the polymers is insufficient, adhesion may not be smoothly performed and desorption may occur during use. Therefore, it is important to set the temperature and pressure conditions of the compression process appropriately for the polymer to be used.

As the polymer resin used in the present invention, high-density polyethylene having good dispersibility of multi-walled carbon nanotubes selected as a linear conductor was selected, and low-density polyethylene which is compatible with high-density polyethylene as a transparent inner interlayer film was used. According to ASTM D1248, they are classified according to their density.

High density polyethylene: density 0.941 g / cm ³ or more

Low density polyethylene: density 0.910 to 0.925 g / cm < ³ >

In the transparent antistatic protective film of the present invention, the conductive linear filler having a large axial ratio can be used without particular limitation as long as it is a conductive linear filler having a large industrial axial ratio, Tubes, single-wall carbon nanotubes, or conductive metal nanowires, but not limited to, all conductive linear fillers.

≪ Examples 1 to 4 >

Antistatic films used for the first layer and the third layer were prepared using the compositions and conditions described in Table 1 below. In this case, the diameter of the high-density polyethylene fiber including the conductive linear filler having a large axial ratio used as a pattern is 0.1 cm, and the compactness is a pattern interval; C (see Fig. 2).

<Comparative Example>

An opaque antistatic protective film having antistatic properties was prepared by simple agitation of a conductive linear filler having a large axial ratio and high density polyethylene instead of a surface lattice pattern.

Pattern composition Pattern density (C) Example 1 HDPE 99wt%
MWCNT 1 wt% 0.5cm Example 2 HDPE 99wt%
MWCNT 1 wt% 1.0cm Example 3 HDPE 99.5 wt%
MWCNT 0.5 wt% 0.5cm Example 4 HDPE 99.5 wt%
MWCNT 0.5 wt% 1.0cm Comparative Example HDPE 99.9 wt%
MWCNT 0.1 wt%

The antistatic characteristics of the films prepared in Examples 1 to 4 and Comparative Examples are shown in Table 2 below. The antistatic property was measured in terms of sheet resistance (Ω / cm ² ) of the film surface in accordance with ASTM D257-93.

Example 1 Example 2 Example 3 Example 4 Comparative Example Sheet resistance (Ω / cm ² ) 10 ⁹ 10 ¹⁰ 10 ¹¹ 10 ¹² 10 ⁹

In Examples 1 to 3 and Comparative Examples, antistatic characteristics were exhibited, and in Example 4, characteristics of nonconductive materials were exhibited. Therefore, it can be said that the compositions and conditions of Examples 1 to 3 satisfy the industry demand level (10 ⁹ to 10 ¹¹ Ω / cm ² ).

In addition, considering that the diameter of the high-density polyethylene fiber including the conductive linear filler having a large axial ratio used as a pattern and the pattern density ratio in Example 1 are 1: 10, There was no significant difference in the amounts of the additives used in the comparative examples, and it was found that additional transparency was obtained at the same raw material cost.

1: HDPE + Conductive linear filler with large axial ratio
2: LDPE
3: Conductive linear filler with high HDPE + axis ratio
C: Spacing between each pattern

Claims (10)

A conductive linear filler comprising a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT) or a metal nano-wire, A first layer having a lattice pattern dispersed therein;
And a second layer made of a second polymer resin which is formed on the lower side of the first layer and has compatibility or adhesion with the first polymer resin. The method according to claim 1,
And a third layer having the same composition and pattern as the first layer at the lower part of the second layer. The method according to claim 1,
The first layer having the lattice pattern may be obtained by dispersing the conductive linear filler in a first polymer resin, molding the fiber into a fiber form, weaving the fiber into a lattice pattern, or dispersing the conductive linear filler in a first polymer resin Wherein the protective film is formed into a film form and then a predetermined repetitive perforation is formed to form a lattice pattern. The method according to claim 1,
Wherein the conductive linear filler is contained in an amount of 0.5 to 1.0 wt% based on the weight of the first polymer resin. The method according to claim 1,
Wherein the thickness of the second layer is 40 to 70% of the thickness of the entire film. The method according to claim 1,
The first polymer resin and the second polymer resin have a density of 0.941 g / cm &lt; ³ &gt; Or a low-density polyethylene having a density of 0.910 to 0.925 g / cm &lt; ³ &gt;. 2. A transparent antistatic protective film having a surface lattice pattern. A conductive linear filler comprising a multi-wall carbon nanotube (MWCNT), a single-wall carbon nanotube (SWCNT) or a metal nano-wire is applied to a first polymeric resin To prepare a first layer film composition;
The first layer film composition is formed into a fiber form and then woven into a lattice pattern or a first layer film composition is formed into a film through a uniaxial or biaxial extrusion process and then a first Layer film manufacturing step;
A second layer film production step of producing a film using a second polymer resin having compatibility or adhesion with the first polymer resin;
The first layer film and the second layer film are arranged vertically, or the first layer film is relocated to the lower part of the first layer film and the second layer film disposed upside and down, and the laminate film is produced through the thermocompression process A method for producing a transparent antistatic protective film having a surface lattice pattern including a film production step. The method of claim 7,
Wherein the conductive linear filler is contained in an amount of 0.5 to 1.0 wt% based on the weight of the first polymer resin. The method of claim 7,
Wherein the step of preparing the laminated film is such that the thickness of the second layer film is 40 to 70% of the thickness of the entire film. The method of claim 7,
The first polymer resin and the second polymer resin have a density of 0.941 g / cm &lt; ³ &gt; Or a low-density polyethylene having a density of 0.910 to 0.925 g / cm &lt; ³ &gt; is used as the protective film.

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