KR20140074620A - Waterproof cloth - Google Patents

Abstract

The present invention relates to a waterproof cloth which is manufactured by bonding a waterproof film on a substrate. The waterproof cloth provides the substrate; and a waterproof substrate including the waterproof film which is adhered to the substrate. The waterproof substrate is to maintain the flexibility of the substrate by the waterproof film having a multi-layer structure to be thermally bonded to the substrate and to have an excellent waterproof effect.

Description

Waterproof cloth {WATERPROOF CLOTH}

The present invention relates to a waterproof cloth, and more particularly, to a waterproof cloth manufactured by adhering a waterproof film to a substrate.

Conventionally, a urethane coating agent is coated on a cloth and dried to form a waterproof cloth (also called tarpaulins) in order to waterproof the cloth or cloth.

As described above, when coating the urethane coating agent, the organic solvent is polymerized by polymerization in a coating agent, followed by coating and drying to obtain a waterproof cloth. When the coating agent is handled and dried, the organic solvent is volatilized, And consumes energy. Also, in the cured product, the thickness of the coated urethane is thick and the surface of the coated urethane is sticky, which hinders the soft and natural texture of the cloth or the foam.

Conventionally, the waterproof cloth has a problem of not only the above problems but also a lot of manufacturing costs, and the waterproof cloth is excessively expensive. When the waterproof cloth is used, it is colored and colored by the urethane coating layer.

Therefore, in order to solve the above-mentioned problems, it is necessary to produce a waterproof cloth which is inexpensive and has excellent quality.

A problem to be solved by the present invention is to provide a waterproof cloth comprising a base material and a waterproof film adhered to the base material.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a waterproof base material including a base material and a waterproof film adhered to the base material.

The substrate may be cloth or foil, and in one preferred example, the substrate may be a cloth woven into the fiber.

The fibers may be natural fibers, synthetic (synthetic) fibers or blended fibers thereof. The natural fibers include cotton, hemp, wool, and the like, but are not limited thereto. The man-made fibers include rayon, polyester, nylon, and the like, but are not limited thereto.

The woven fabric includes woven fabric such as plain weave, twill weave, water weave, and the like. Such fabrics may be dyed (dyed) and dyed woven or woven fabrics with dyes such as dyes, sprays, etc. to impart design and fashion functions.

In one example, the adhesion of the waterproof film may be thermal bonding. When a part of the film is softened or melted by heat and then hardened after being impregnated on the substrate, it is preferable since the adhesive strength to the substrate is excellent.

The method of thermally adhering the cloth or the cloth and the waterproof film according to the present invention is not particularly limited, and for example, a general laminator having a heating function added to the cloth roll can be used. Electricity or steam is used as the medium to generate heat, and one or more kinds of heating roll, hot air, and IR heater can be selected.

The waterproof film may have a multi-layer structure. When the thermal bonding is performed as described above, when softening or melting occurs at a portion other than the portion where adhesion occurs, the process itself may be impossible, and therefore, it is preferable to have a multi-layer structure rather than a single layer.

Such a multi-layer structure may include an adhesive layer that adheres to the substrate, and the softening point and / or melting point of the adhesive layer is lower than the softening point and / or melting point of the remaining layer. Due to such a constitution, only the adhesive layer is softened or melted at a specific temperature during the heat bonding to bond the substrate to the substrate, and the remaining layer is not softened, and does not cause defects such as sticking to heat bonding equipment or the like.

In one preferred example, the difference between the softening point of the adhesive layer and the softening point of the remaining layer may be at least 50 ° C. In order to soften or melt the adhesive layer by placing the adhesive layer in the inside and applying heat from the outside, the temperature applied to the remaining layer becomes higher than the temperature applied to the adhesive layer. Therefore, considering the temperature difference, the softening point of the adhesive layer and the softening point The difference is preferably 50 DEG C or more. However, in order to manufacture a multi-layered waterproof film, it is preferable that the difference between the softening point of the adhesive layer and the softening point of the remaining layer is 100 캜 or less. If the softening point and / or melting point difference of the multi-layer constituting material is large, it is difficult to produce a single multi-layered film, which is not preferable.

In one example of the present invention, the waterproof film comprises an adhesive layer to be adhered to a substrate; A core layer imparting flexibility and heat resistance of the film; And an outer layer for imparting heat resistance.

The softening point of the adhesive layer may range from 30 to 95 캜. The adhesive layer may be formed based on, for example, ethylene vinyl acetate (EVA) resin. A preferable example of the EVA resin is a polyester resin having a melt index (MI) at 190 캜 of 0.3 to 20 g / 10 min, a density of 0.92 to 0.95, a vinyl acetate content (V / A content%) of 5 to 35 wt% A melting point of 60 to 110 占 폚, and a vicat softening point of 30 to 95 占 폚.

The heat bonding temperature of the adhesive layer can also be adjusted by selectively adding an elastomer such as an ethylene methyl acrylate copolymer resin, a polybutene resin, an -olefin copolymer resin, or a petroleum resin to the EVA resin within a range of 10 wt% have.

The softening point of the core layer and the outer layer may be in the range of 140 to 160 캜. The core layer may be composed of a block PP resin to impart flexibility and heat resistance of the entire film. A preferable example of the block PP resin is one having an MI of 1 to 10 g / 10 min at 230 캜, a density of 0.90 to 0.92, a melting point of 155 to 165 캜, and a vicat softening point of 140 to 160 캜 .

The rubber component content of the block PP resin is preferably in the range of 3 to 15 wt% based on the total weight of the resin. The larger the content of the rubber component, the higher the flexibility of the entire film, but if it is too large, film formation may become difficult, which is not preferable. In order to further increase the flexibility, a PO (polyolefin) -based elastomer having a density of 0.92 or less may be added and mixed in an amount of 20 wt% or less. Further, in order to add color, a color master batch may be added to the above block PP resin.

The outer layer is composed of a block PP resin alone or a mixture of block PP and homopolypropylene (homo PP) in order to impart heat resistance to heat during heat bonding. The outer layer may contain an anti-blocking agent in order to prevent blocking of films sticking to each other. Examples of the antiblocking agent include silicon oxide (SiO ₂ ), and the silicon oxide may have a particle size ranging from 3 to 6 μm. The antiblocking agent may be used in a range of 1000 to 3000 ppm mixed with the entire outer layer resin. If necessary, the outer layer may be adjusted to be matte.

In the three-layer film having the adhesive layer / the center layer / the outer layer constituted as described above, the softening point of the center layer and the outer layer resin is at least 50 캜 higher than the softening point of the adhesive layer resin.

The production apparatus or the manufacturing method of the waterproof film having the three-layer structure in which the adhesive layer / the center layer / the outer layer are sequentially laminated is not particularly limited. For example, a three-layered waterproof film having three extruders, a T- It can be made from cast film line.

One example of the production of the three-layer film by the lead-free cast film method is described below, but the present invention is not limited thereto.

The resin of each of the adhesive layer, the center layer and the outer layer was supplied to a hopper provided above each of the first auxiliary extruder, the main extruder and the second auxiliary extruder, and the temperature of each extruder was set in accordance with the melting conditions of the resin to be used The molten film discharged from the T-die is fixed on a cooling roll, and wound up on a winder to produce a three-layer non-oriented film. At this time, by performing corona treatment on the outer layer, it is possible to facilitate the work such as printing on the film surface of the waterproof cloth which is the final product.

The thickness of the waterproof film may range from 20 탆 to 100 탆. When the thickness of the waterproof film is less than 20 탆, the function of the waterproof cloth is deteriorated, and when the thickness exceeds 100 탆, the flexibility of the film is lowered.

The thickness of the adhesive layer may be 5 占 퐉 or more. When the thickness of the adhesive layer is less than 5 탆, the adhesive strength decreases when the adhesive layer is thermally fused with the cloth, which is not preferable. In consideration of the total thickness of the waterproof film, the thickness of the adhesive layer may be 25 占 퐉 or less.

The thickness of the center layer is preferably 10 占 퐉 or more so as to impart flexibility to the film and ensure heat resistance. In consideration of the total thickness of the waterproof film, the thickness of the center layer may be 80 占 퐉 or less.

The thickness of the outer layer may range from 5 [mu] m to 25 [mu] m for the same reasons as the center layer.

The embodiments of the present invention have at least the following effects.

That is, it provides a waterproof cloth which is more excellent in texture and color, does not cause contamination by oil or food, and has a low manufacturing cost.

In addition, since the cloth and the film can be formed by simply heat-bonding, a waterproof cloth that does not cause environmental pollution in the manufacturing process is provided.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a schematic enlarged cross-sectional view of a waterproof cloth according to an embodiment of the present invention.
Fig. 2 is an enlarged cross-sectional view of the heat sealing surface in the waterproof cloth shown in Fig. 1;
3 is a schematic view of a hot melt laminating machine for manufacturing a waterproof cloth according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the accompanying drawings and embodiments. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It will be understood that when an element or layer is referred to as being "on" of another element or layer, it encompasses the case where it is directly on or intervening another element or intervening layers or other elements. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. In each of the examples, the film was composed of three layers of an adhesive layer / a center layer / an outer layer, and the total thickness was 50 μm.

≪ Example 1 >

The adhesive layer consisted of EVA with a vicat softening point of 77 ° C, block PP with an MI of 4.5 g / 10 min in the center layer, and block PP with an MI of 4.5 g / 10 min in the outer layer and 2000 ppm of SiO ₂ with an average particle size of 3 ㎛ .

≪ Example 2 >

In the adhesive layer, EVA with a vicat softening point of 61 ° C, block PP with MI 2.5 g / 10 min in the center layer, and block PP with MI 4.5 g / 10 min in the outer layer were mixed with 2000 ppm of SiO ₂ having an average particle size of 3 μm .

≪ Example 3 >

In the adhesive layer, EVA with a vicat softening point of 61 ° C was mixed with 20 wt% of a polyolefin elastomer having a density of 0.89 and a shore hardness of 40 in a block PP having an MI of 4.5 g / 10 min in the center layer. In the outer layer, SiO ₂ having a particle diameter of 3 탆 was mixed with 2000 ppm of the entire outer layer to prepare a film.

<Example 4>

In the adhesive layer, EVA with a vicat softening point of 61 ° C, block PP with an MI of 4.5 g / 10 min in the center layer and PP base MATT resin with a softening point of 155 ° C in the outer layer were mixed with 2000 ppm of SiO ₂ having an average particle size of 3 μm A film was prepared.

&Lt; Example 5 >

In the adhesive layer, EVA having a vicat softening point of 61 ° C was mixed with 10% of ethylene methyl acrylate copolymer resin having a vicat softening point of 61 ° C. The block PP having a MI of 4.5 g / 10 min and the MI of 4.5 g / 10 min SiO ₂ having an average particle diameter of 3 탆 was mixed with 2000 ppm of the entire outer layer to prepare a film.

&Lt; Comparative Example 1 &

The mixture was weighed at a compounding ratio of 25 wt% of polyester glycol, 3 wt% of triisocyanate, 50 wt% of DMF (dimethyl formamide) and 22 wt% of TOLUENE, and the mixture was stirred in a stirrer for 30 minutes to prepare a urethane solution. The urethane solution prepared on the releasing paper was coated with a knife coater, dried in a drying oven at 120 캜 for 2 minutes, and the releasing paper was separated to prepare a urethane film having a thickness of 50 탆.

<Experimental Example>

The waterproof films prepared in Examples 1 to 5 and Comparative Example 1 were measured by measuring the stiffness and the coefficient of friction. The stiffness was measured with a loop stiffness tester manufactured by Toyo Seiki Co., Ltd. One piece of a film having a film width of 25 mm was measured. The coefficient of friction was measured with a friction tester of Toyo Seiki Co., Ltd. against the outer surface of the film. The results are shown in Table 1.

Sample Stiffness Coefficient of friction Example 1 1.5 g / 25 mm 0.30 Example 2 1.4 g / 25 mm 0.30 Example 3 1.1 g / 25 mm 0.30 Example 4 1.5 g / 25 mm 0.25 Example 5 1.3 g / 25 mm 0.30 Comparative Example 1 1.5 g / 25 mm 0.92

Referring to FIG. 1, it can be seen that the coefficient of friction of the urethane film of Comparative Example 1 is much higher than that of the multilayered films of Examples 1 to 5. This is a problem that the surface is caused by sticky, and when the waterproof cloth is applied to the cloth, the smooth and natural texture of the cloth is deteriorated. On the other hand, in the case of the waterproof films of Examples 1 to 5, the coefficient of friction is significantly lower than that of the urethane film, so that when the waterproof cloth is produced by applying the waterproof cloth, the smooth and natural texture inherent to the cloth can be maintained.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a schematic enlarged cross-sectional view of a waterproof cloth according to an embodiment of the present invention. 1, the waterproof cloth of the present invention includes a cloth 10, and a waterproof film 20 having a three-layer structure of an adhesive layer 21, a center layer 22, and an outer layer 23.

The fabric 10 is made of fibers and is woven with natural fibers such as cotton, hemp, wool, silk, etc., and woven with artificial / synthetic fibers such as rayon, polyester or nylon, , And the like. Also, in the weaving method, weaving means weaving in plain weave, twill weaving, and numerical weaving except knitting. Also, it refers to the function of design and fashion by dyed yarn (dyed yarn) and weaving or weaving the fabric to dye beautiful fabric by dyed with dyes such as dipping, kneading or the like.

The waterproof film 20 is a three-layered film in which the adhesive layer 21 / the center layer 22 / the outer layer 23 are sequentially laminated. The adhesive layer 21, which is bonded to the cloth by heat, is made of ethylene vinyl acetate (EVA) A resin is used as a base and an elastomer resin is used in combination, and the thickness of the resin is 5 m or more. The core layer 22 is made of a block PP resin so as to withstand the heat applied at the time of heat bonding while imparting flexibility to the film. The thickness of the core layer 22 is 10 μm or more. The outer layer 23 is made of a homo PP resin containing block PP so as to have heat resistance against heat applied at the time of heat bonding and has a thickness of 5 탆 or more, Or more.

The resin used for the central layer 22 and the outer layer 23 is designed to have a softening point at least 50 캜 higher than that of the resin used for the adhesive layer 21. If the difference in the softening point does not exceed 50 ° C, it becomes difficult to bond the cloth and the waterproof film to each other with heat, and a desired waterproof cloth can not be formed.

Fig. 2 is an enlarged cross-sectional view of the heat sealing surface in the waterproof cloth shown in Fig. 1; 1 and 2, the bonding portion 21 of the waterproof film 20 is softened or melted by heat and fused corresponding to the weaving pattern of the cloth 10 woven with the weft yarn and the warp yarn. As shown in FIG. 2, the adhesive layer 21 is bonded to the adhesive layer 21 with no void space, thereby increasing the adhesive area, and thus the adhesive strength is further improved.

3 is a schematic view of a heat-seal laminating machine for producing a waterproof cloth according to an embodiment of the present invention. 3, the hot melt bonding machine 100 includes a cloth unwinder 142, a waterproof film unwinder 141, a press roll 110, a heating roll 120, a heater 130 and a winder 150 do.

The cloth 10 and the waterproof film 20 are supplied between the press roll 110 and the heating roll 120 in the cloth unwinder 142 and the waterproof film unwinder 141 respectively. The heater 130 is positioned between the cloth 10 and the waterproof film 20 in front of the point where the cloth 10 and the waterproof film 20 meet. The heater 130 preheats the adhesive layer (not shown) of the separation film 20 for heat fusion so that the heat fusion can be performed smoothly. The heater 130 may be, for example, an air supply or an IR heater that supplies hot air.

The cloth 10 and the waterproof film 20 are thermally fused between the press roll 110 and the heating roll 120. The press roll 110 is pressurized to cause fusion, and the heating roll 120 is heated to soften or melt the adhesive layer (not shown). In one example, the heating roll 120 may be positioned in a direction in contact with the cloth 10. [ (Not shown) and / or outer layer (not shown) of the waterproof film 20 may not be damaged due to heat.

The waterproof cloth 30 thermally fused in the press roll 110 and the heating roll 120 is wound on the winder 150.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It can be understood that It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: Cloth
20: Waterproof film
21: Adhesive layer
22: center layer
23: outer layer
30: Waterproof cloth
100: Heat fusion lapping machine
110: press roll
120: heating roll
130: heater
141: waterproof film unwinder
142: Cloth unwinder
150: winder

Claims (12)

A waterproof substrate comprising a substrate, and a waterproof film adhered to the substrate. The method according to claim 1,
The substrate is a cloth or a waterproof substrate. The method according to claim 1,
Wherein the waterproof film is adhered by heat. The method according to claim 1,
Wherein the waterproof film is a multi-layered structure including an adhesive layer that adheres to a substrate. 5. The method of claim 4,
Wherein the difference between the softening point of the adhesive layer and the softening point of the remaining layer is 50 DEG C or more. 5. The method of claim 4,
Wherein the waterproof film comprises an adhesive layer for adhering to a substrate; A core layer imparting flexibility and heat resistance of the film; And an outer layer for imparting heat resistance. The method according to claim 6,
Wherein the adhesive layer has a softening point in the range of 30 to 95 占 폚. The method according to claim 6,
Wherein the adhesive layer comprises an ethylene vinyl acetate (EVA) resin. The method according to claim 6,
Wherein the center layer and the outer layer have a softening point in the range of 140 to 160 캜. The method according to claim 6,
Wherein said core layer comprises block polypropylene (block PP) resin. The method according to claim 6,
Wherein said outer layer comprises block polypropylene (block PP), or block polypropylene (block PP) and homopolypropylene (homo PP) resin. The method according to claim 1,
Wherein the waterproof film has a thickness ranging from 20 탆 to 100 탆.

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