KR20080042309A - Coating resin for the waterproof and breathable, a dry-typed non-porous fabric using thereof and a method of preparing the same - Google Patents

Abstract

A coating composition for imparting moisture permeability and waterproof property to fabric is provided to avoid a need for base coating required for a conventional dry polyurethane waterproof coating process, and to obtain moisture-permeable waterproof dry non-porous fabric having improved appearance, touch feeling and water pressure resistance. A coating composition(200) for imparting moisture permeability and waterproof property to fabric(100) comprises: 100 parts by weight of a polyurethane resin; 5-20 parts by weight of a solvent; 0.2-1.0 parts by weight of a resin crosslinking catalyst; and 1-2 parts by weight of a crosslinking agent, and has thixotropic property so as to enable direct application to fabric. The coating composition optionally further comprises a white toner, silica or slip aid.

Description

Coated Resin for the waterproof and Breathable, A Dry-typed Non-porous Fabric using about and A Method of Preparing the same}

1 is a schematic view of a coating layer prepared by the prior art.

Figure 2 is a schematic view of the coating layer according to an embodiment of the present invention.

Figure 3 is a flow chart of the waterproof fabric manufacturing process according to an embodiment of the present invention.

<Detailed Description of Main Parts of Drawing>

10: fabric 20: base layer

30: surface coating layer 100: fabric

200: coating layer

The present invention relates to a coating composition, a moisture-permeable waterproof fabric using the same, and a method for manufacturing the same, in particular, sportswear, mountaineering clothes, ski wear, and the like, which can be used for sports clothing to be used for intense sports under relatively severe weather conditions. The present invention relates to a composition having no environmental pollution, a moisture-permeable waterproof fabric, and a preparation method thereof.

In general, a process for manufacturing a moisture-repellent waterproof fabric is applied directly to the wet polyurethane resin composition or polyurethane resin composition which can be dissolved in an organic solvent on the fabric by a knife over roll or knife floating method, and then solidified in a dry or wet process. To form fine pores on the coating layer. However, these moisture-proof waterproof fabrics are very harmful to the human body of workers exposed to the working environment due to the use of a large amount of organic solvents used for elution to form micropores, and the limitations causing environmental pollution such as water quality and air pollution. There was.

In order to overcome this problem, Korean Patent Laid-Open Publication No. 2001-9341 has a base layer composed mainly of a two-component polyurethane resin having hydrophilicity derived from polyvinyl alcohol or polyethylene oxide on a fabric of synthetic fibers. A method characterized in that a surface coating layer containing silica as a main component is formed on a base layer of a one-component polyurethane resin having hydrophilicity. That is, the moisture-permeable waterproof coating applied to the general industrial field essentially includes a base layer, and the surface coating was sequentially performed on the base layer to perform a function as a moisture-repellent waterproof fabric. Such a conventional waterproof waterproof fabric has a structure as shown in FIG.

However, the moisture-permeable waterproof fabric prepared by the conventional coating method is prepared by two or more coatings of the two layers of the base layer and the surface coating layer, whereby drying is performed on a plurality of coating layers, resulting in the coating surface generated in this process. The number of micropores that can be identified by eye can reduce the value of the product and also increase the manufacturing cost in the manufacturing process due to the sequential two-step process of base coating and surface coating on the fabric. Although the degree of environmental pollution has been reduced, there is a limit that environmental pollution is still a problem because a number of coating processes are required.

In addition, recently, in order to overcome this problem, a method of applying a polyurethane resin composition on a release paper to produce a resin film and then laminating on a fabric and peeling off the release paper, as introduced in Korean Patent Invention 10-0555214, This can be found in the fact that it does not have a conventional base coating and satisfies the quality of moisture permeability, water resistance, and touch on the finished product required as a moisture-permeable waterproof fabric, but this also uses a release paper that causes an increase in manufacturing cost. And another limitation in that it involves an additional process called release paper release.

The proposed moisture-permeable waterproof fabric is due to the inability to form an appropriate moisture-proof waterproofing fabric in the end. In order to express moisture-permeable water from the fabric to a single layer, the composition is applied only to one side of the fabric during coating and the composition penetrates to the back side. No. To this end, the composition must be endowed with Rheologic Thixotropic properties.

Accordingly, an object of the present invention is to achieve a three-step dry non-porous moisture permeability of the fabric-base layer-surface coating layer from the conventional bottom by completing a single coating without performing the base coating, which is basically performed at the time of dry polyurethane waterproof coating By reducing the fabric manufacturing process to a two-stage manufacturing process of the fabric-coating layer, the present invention provides a moisture-permeable waterproof coating composition and a moisture-permeable waterproof fabric using the same, which can improve productivity, reduce environmental pollution, and better coating quality.

Another object of the present invention is to provide a moisture-permeable waterproof coating composition capable of performing the function of the waterproof moisture-proof fabric by only one coating as described above, and a waterproof moisture-proof fabric using the same and a method of manufacturing the same.

Still another object of the present invention is to provide a fabric having an improved appearance, touch, moisture permeability, and water pressure resistance compared to the conventional water-permeable waterproof fabric by applying the coating once.

In order to achieve the above objects, the present invention, in the coating composition for moisture-permeable waterproof, based on 100 parts by weight of polyurethane resin, 5 to 20 parts by weight of solvent, 0.2 to 1.0 parts by weight of resin crosslinking catalyst, 1 to 2 parts by weight of crosslinking agent Provides a coating composition for moisture-permeable waterproof, which is endowed with thixotropic properties to allow direct application to the film.

In another aspect, the present invention provides a coating composition for waterproof moisture-permeable coating composition further comprises 20 parts by weight or less, 2 parts by weight or less of silica, 5 parts by weight or less of a slip aid, based on 100 parts by weight of the polyurethane resin.

In another aspect, the present invention provides a coating composition for waterproofing moisture, wherein the polyurethane resin is a half-liquid polyurethane resin having hydrophilicity derived from polyvinyl alcohol or polyethylene oxide.

In addition, the present invention is 100% Modulus (100% Modulus) 30 to 35kgf / ㎠, viscosity 20,000 to 30,000cps / 30 ℃, non-volatile content 30 to 45%, tensile strength (TS) 200 to 400kgf / ㎠, elongation ( Elongation) to provide a coating composition for waterproof moisture permeation of 500 to 700%.

In another aspect, the present invention provides a coating composition for moisture-permeable waterproof made of the following polyurethane resin.

In another aspect, the present invention is a dry non-porous waterproof waterproof fabric, consisting of a fabric and a waterproof waterproof coating layer formed thereon is formed of a coating on one side of the fabric, the coating layer provides a waterproof waterproof fabric formed of the coating composition. .

In another aspect, the present invention provides a moisture-proof waterproof fabric having a good water resistance and a good slip resistance and water resistance of 600 to 10,000 mmH ₂ O, moisture permeability of 7,000 to 12,000 g / ㎡.24hrs.

In another aspect, the present invention provides a method for manufacturing a dry, non-porous moisture-proof fabric, the preparation step consisting of weaving step, refining and bleaching step, dyeing step, water repellent treatment step; Heat-setting the prepared fabric with hot air at 120 to 180 ° C .; Calendering the heat-set fabric under conditions of 40 to 160 ° C., a nip pressure of 80 to 100 kgf / cm 2, and a processing speed of 30 to 60 m / min; Coating the calendered fabric on one surface of the fabric with the coating composition according to any one of claims 1 to 5, and drying the coated fabric under hot air temperature of 130 to 160 ° C. It provides a method for manufacturing a dry, non-wetting type waterproof breathable fabric.

In another aspect, the present invention provides a method for producing a dry perforated waterproof waterproof fabric is carried out by the knife over roll coating method or the knife floating coating method in the coating step.

In another aspect, the present invention provides a method of manufacturing a dry non-porous moisture-proof waterproof fabric having a gap between the upper surface of the fabric and the knife in close contact with the top of the coating coating roller when the knife over roll coating.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms “about”, “substantially”, and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the meanings indicated are intended to aid the understanding of the invention. Accurate or absolute figures are used to assist in the prevention of unfair use by unscrupulous infringers.

As used herein, the term "fabric" is used to include all articles, nonwoven fabrics and fibrous webs produced by weaving or knitting.

Figure 3 shows a manufacturing process flow chart of the waterproof moisture permeable fabric according to an embodiment of the present invention.

Method according to a preferred embodiment of the present invention, weaving step, refining and bleaching step, dyeing step, water repellent treatment step, heat setting step, calendering step, coating step, drying step, as shown in the manufacturing process flow chart It may be formed, including the step of completing the non-porous moisture-proof fabric. Among these, the weaving step to the dyeing step can be seen as a preparation step in the manufacturing flow of the moisture-permeable waterproof fabric, and from the water repellent treatment step to the completion of the non-porous water-resistant waterproof fabric can be seen as a post-process step. The preparation step can be carried out using a conventional method, and to explain briefly, the fabric can be purchased and dyed with synthetic dyes, or the dyed fabric can be purchased and used. It's okay. When weaving the fabric directly, the warp and weft yarn is woven into plain or twill weave to manufacture the fabric, and the fabric is refined and bleached, and can be dyed using a liquid dyeing machine, jigger, or the like. Detailed description will be omitted in the present invention.

Next, the post process step will be described. The fabric that has undergone the above preparation step is preferably treated with a water repellent using a dipping method as a fluorine-based water repellent to enable coating.

Since the water-repellent treated fabric is preferably heat-set in a hot air dryer of 120 to 180 ℃. In this case, when the hot air temperature of the hot air dryer is less than 120 ° C., it is difficult to realize a good coating due to poor drying. When the hot air temperature of the hot air dryer exceeds 180 ° C., heat curing occurs in the fabric due to excessive drying, resulting in a hard touch. (Heat fixing step)

Subsequently, after the dyeing and water repellent treatment in the above method, the heat-set fabric is given smoothness on the surface of the fabric so that a more uniform coating can be achieved by calendering before coating. Nip) Calendering is performed under process conditions of 80 to 100 kgf / cm 2 and a processing speed of 30 to 60 m / min. In this case, when the calender temperature is less than 40 ° C., the smoothness of the fabric is lowered, resulting in a decrease in coating quality. When the calender temperature is higher than 160 ° C., a change in color and feel of the fabric occurs due to excessive temperature. In addition, when the nip pressure is less than 80 kgf / ㎠, the proper tension is not applied to the fabric, non-uniform calendaring occurs, and when the nip pressure is more than 100 kgf / ㎠, deformation of the fabric form due to thermal curing due to excessive compression on the calendar May occur. In addition, when the processing speed is less than 30 m / min brings a decrease in productivity, if it is more than 60 m / min uneven calendaring may also occur due to excessive processing speed (calendar step).

Subsequently, the surface of the fabric is subjected to a coating step of applying a polyurethane resin composition, that is, a polyurethane resin coating composition including a polyurethane resin, white toner and silica. In this case, as the coating method, it may be based on knife over roll coating or knife floating coating.

At this time, the knife over roll coating according to an embodiment of the present invention is preferably 150 to 200 ㎛ between the upper surface of the fabric and the knife in close contact with the top of the roller. If the gap is less than 150 ㎛, tearing of the fabric by the knife and coating deviation occurs during the coating process, and if it exceeds 200 μm, a large amount of coating composition is applied, resulting in curling and the like. do.

Subsequently, the composition according to a preferred embodiment of the polyurethane coating composition may be formed of 5 to 20 parts by weight of solvent, 0.2 to 1.0 part by weight of resin crosslinking catalyst, and 1 to 2 parts by weight of crosslinking agent based on 100 parts by weight of polyurethane resin. Can be. Meanwhile, 20 parts by weight or less of coating white toner, 2 parts by weight or less of silica, and 5 parts by weight or less of slip aid may be further included based on 100 parts by weight of the polyurethane resin.

The polyurethane resin is preferably a half-liquid polyurethane resin having hydrophilicity derived from polyvinyl alcohol or polyethylene oxide.

If the solvent is less than 5 parts by weight of the coating composition is too low flowability of the coating operation is difficult, if more than 20 parts by weight is not suitable for use as a coating composition of the present invention due to the reduction of non-volatile content.

In addition, when the resin crosslinking catalyst is less than 0.2 parts by weight, a decrease in water resistance and adhesive strength occurs, and when it exceeds 1.0 parts by weight, there is a problem that the pot life due to viscosity increase is shortened.

In addition, when the crosslinking agent is less than 1 part by weight, similarly to the resin crosslinking catalyst, a decrease in water resistance and adhesive strength occurs, and when it is more than 2 parts by weight, a hard touch is caused.

In addition, the coating white toner is used for the purpose of giving a concealment effect, it may be used depending on the purpose, but if it exceeds 20 parts by weight, the coating film may become hard or cracks (cracks) may occur.

In addition, the silica does not need to be used depending on the use as a matting agent to give a subtle reflection to the coating surface to give a soft tone, but if it exceeds 3 parts by weight, the flowability due to the increase in viscosity of the coating resin is reduced This makes the coating very difficult.

In addition, the slip aid is intended to improve the slip property of the fabric. It is not a big problem even if it is not used depending on the use, but it causes a cost increase when used excessively.

Subsequently, the physical properties according to the preferred embodiment of the polyurethane coating composition 30 to 35 kgf / ㎠, viscosity 20,000 to 30,000 cps / 30 ℃, non-volatile content 30 to 45%, tensile strength 100% modulus (TS) 200 to 400 kgf / ㎠, elongation (Elongation) is preferably 500 to 700%.

At this time, by the composition and the resin properties accordingly, thixotropic properties, which are rheologic properties of the resin, are given to one surface of the fabric during coating to prevent resin leaching or reduce liquid penetration. The molecular structure of the coating composition is as follows.

A schematic view of the coating layer according to the preferred embodiment of the present invention as described above is shown in FIG. 2 (coating step).

Subsequently, the fabric coated with one surface of the polyurethane resin coating composition is subjected to a drying step of drying the coating composition in a hot air dryer at 130 to 160 ° C. In this case, if the hot air temperature of the hot air dryer is less than 130 ° C., productivity decreases due to a decrease in drying speed. If the hot air dryer exceeds 160 ° C., the coating quality is reduced due to the heat deformation of the coating composition on the fabric. (Dry stage)

As such, the fabric that has undergone the post-processing step of the drying step from the water repellent treatment step reaches a completion step as a dry non-porous moisture-proof waterproof fabric with improved moisture permeability, water resistance, appearance and touch.

Example  One

The fabric is woven into plain weave using warp and threaded ATY with 100% polyamide and 70 denier average fineness. Subsequently, the fabric is refined, washed with water, bleached, and then dyed in a liquid dyeing machine using an acid dye. Thereafter, the fabric is subjected to dipping in a fluorine-based water repellent and heat-set in a hot air dryer at 160 ° C. Subsequently, in order to smooth the surface of the fabric tissue, the calender is calendered at a process condition of 120 ° C. temperature, nip pressure 80 kgf / cm 2, and treatment rate 50 m / min.

Subsequently, a coating process is performed on the surface of the fabric smoothed by calendering with a polyurethane coating composition. The coating composition has the following composition: 100 parts by weight of resin, 10 parts by weight of solvent, 0.28 parts by weight of resin crosslinking catalyst, 5 parts by weight of the white toner for coating, 2 parts by weight of silica, and 3 parts by weight of the slip aid are prepared in a uniform mixture.

Subsequently, the polyurethane coating composition blended as described above is filtered through a 80 neck mesh and then coated with a knife over roll on the fabric with a 200 μm clearance.

On the other hand, the polyurethane coating composition has the following physical properties. Polyurethane resin properties are 100% Modulus 33 kgf / ㎠, viscosity 25,000 cps / 30 ℃, non-volatile content 30%, tensile strength (T-S) 300 kgf / ㎠, elongation (Elongation) 600%.

The test results according to the present Example 1 are as follows. A water resistance of 9,000 mmH ₂ O, a moisture permeability of 9,000 g / m ₂ .24hrs, and excellent feel and a good slip property are obtained.

Example  2

In Example 1 to improve the physical properties of the resin and raise the solid content is carried out as follows to increase the degree of after-feel in the final coating. The polyurethane coating composition was uniformly blended into 100 parts by weight of a solvent, 10 parts by weight of a solvent, 0.5 parts by weight of a resin crosslinking catalyst, 10 parts by weight of a white toner for coating, 1.5 parts by weight of silica, and 0.5% by weight of a crosslinking agent. After filtering the knife over roll coating to 150 μm. At this time, the physical properties of the polyurethane coating composition is 100% modulus (100% Modulus) 20 kgf / ㎠, viscosity: 30,000 cps / 30 ℃, non-volatile content 45%.

The test results according to the present Example 2 are as follows, a water resistance of 9,000 mmH ₂ O moisture permeability of 8,500 g / ㎡.24hrs, excellent in touch, and a good slip property is obtained.

Comparative example  One

In the two-step process of conventional base coating and surface coating, the coating is performed only once with the dry base coating on the fabric. The test result according to Comparative Example 1 is difficult to commercialize due to severe stickiness (TACKY) of the coating surface.

Comparative example  2

In the two-step process of conventional base coating and surface coating, the coating is performed only once with the dry surface coating on the fabric. The test result according to Comparative Example 2, the coating is hard and the flexibility is poor, there is no product value.

Comparative Example 3

Both conventional base coating and surface coating two-step processes are carried out. That is, the base coating of Comparative Example 1 and the surface coating of Comparative Example 2 are sequentially performed on the fabric. The test result according to Comparative Example 2 has a normal level of water pressure, moisture permeability, tactile feeling, and slip resistance.

Polyurethane resin compositions (parts by weight) of Examples and Comparative Examples according to the present invention are shown in Table 1 below, and the physical properties thereof are compared in Table 2.

division Suzy solvent Resin Crosslinking Catalyst White Toner for Coating Silica Slip aids Crosslinking agent Filter Coating method Example 1 100 10 0.28 5 2 3 - 80 neck mesh Knife Over Roll (200㎛) Example 2 100 10 0.50 10 1.5 - 0.50 80 neck mesh Knife Over Roll (150㎛) Comparative Example 1 Only one coating of dry base coating Comparative Example 2 Only one coating of dry surface coating Comparative Example 3 Dry base coating + dry surface coating (normal method)

division 100% Modulus (kgf / ㎠) Viscosity (cps / 30 ℃) Nonvolatile matter (%) Tensile Strength (kgf / ㎠) Elongation (%) Remarks Example 1 33 25,000 30 300 600 Example 2 20 30,000 45 300 600 Purpose of improving after-feel compared to Example 1 Comparative Example 1 7 70000 40 60 450 Dry base coating 1 coating Comparative Example 2 30 25,000 30 350 800 Dry surface coating 1 coating Comparative Example 3 - - - - - Comparative Example 1 + Comparative Example 2 (normal method)

In addition, the physical properties and quality comparison of the polyurethane resin coating fabric of the Examples and Comparative Examples according to the present invention are compared in the following Table 3.

division Water pressure resistance (mmH2O) Water vapor permeability (g / ㎡, 24hr) touch Slip Remarks Example 1 9,000 9000 Great Good Example 2 9,000 8500 Great Good Comparative Example 1 9,000 8,500 TACKY Bad Not commercialized Comparative Example 2 9,000 8,500 Crackle - No commodity value Comparative Example 3 9,000 9,000 usually usually The usual way

In the present invention, the evaluation method of the test is a water inverted cup (Water Inverted Cup) (temperature 32 ℃, 50% humidity) was applied, the water pressure is in accordance with ISO 0811 (ISO 0811).

According to the coating composition for moisture-permeable waterproof and dry non-porous moisture-proof fabric and the manufacturing method thereof according to the present invention as described above, the three-step dry non-porous moisture-proof fabric manufacturing process of the fabric-base layer-surface coating layer from the conventional fabric -Reduced by two-stage manufacturing process of the coating layer can bring productivity improvement due to process reduction.

In addition, according to the dry non-porous moisture-proof waterproof fabric and a method for manufacturing the same according to the present invention can perform the function of the basic moisture-proof waterproof fabric such as moisture permeability, water resistance, etc., with only one coating, and the micropores in the conventional Eliminates the appearance defects and improves the feeling of touch, such as the improvement of the coating quality can bring maximization of the commerciality.

In addition, according to the present invention dry dry non-porous moisture-proof fabric and its manufacturing method can reduce the amount of environmental pollution sources such as coating materials due to the process saving due to the one-time coating can significantly prevent environmental pollution compared to the prior art.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims (10)

In the coating composition for waterproofing moisture, Based on 100 parts by weight of polyurethane resin, 5 to 20 parts by weight of solvent, 0.2 to 1.0 parts by weight of resin crosslinking catalyst, and 1 to 2 parts by weight of crosslinking agent is provided with thixotropic property to allow direct application to fabrics. Waterproof coating composition. The method of claim 1, The composition is based on 100 parts by weight of the polyurethane resin coating toner 20 parts by weight or less, 2 parts by weight or less of silica, 5 parts by weight or less of the slip aid further coating composition for waterproofing and waterproofing. The method according to claim 1 or 2, The polyurethane resin is a coating composition for moisture-permeable waterproof is a half-component polyurethane resin having a hydrophilicity derived from polyvinyl alcohol or polyethylene oxide. The method according to claim 1 or 2, The composition is 100% Modulus (100% Modulus) 30 to 35kgf / ㎠, viscosity 20,000 to 30,000cps / 30 ℃, non-volatile content 30 to 45%, tensile strength (TS) 200 to 400kgf / ㎠, elongation (Elongation) 500 to 700% moisture-permeable coating composition. The method of claim 3, The polyurethane resin is a coating composition for moisture-permeable waterproof consisting of the following formula.

In the dry, impervious waterproof waterproof fabric, Made of a fabric and a moisture-permeable waterproof coating layer formed on the top is formed of a coating on one side of the fabric, the coating layer formed of a coating composition according to any one of claims 1 to 5. The method of claim 6, The moisture resistance of the moisture-proof waterproof fabric is 600 to 10,000mmH ₂ O, the moisture-permeable waterproof fabric is excellent in appearance and feel, the slipperiness of 7,000 to 12,000 g / ㎡.24hrs. In the manufacturing method of dry non-porous moisture-proof fabric, Preparation stage consisting of weaving step, refining and bleaching step, dyeing step and water repellent treatment step; Heat-setting the prepared fabric with hot air at 120 to 180 ° C .; Calendering the heat-set fabric under conditions of 40 to 160 ° C., a nip pressure of 80 to 100 kgf / cm 2, and a processing speed of 30 to 60 m / min; Coating the calendered fabric on one side of the fabric with a coating composition according to any one of claims 1 to 5, and Drying the non-porous moisture-proof waterproof fabric comprising the step of drying the coated fabric under hot air temperature 130 ~ 160 ℃ conditions. The method of claim 8, The coating step is a method of manufacturing a dry non-porous moisture-proof waterproof fabric is carried out by the knife over roll coating method or knife floating coating method. The method of claim 9, The method of manufacturing a dry non-porous moisture-proof waterproof fabric having a gap between the upper surface of the fabric and the knife in close contact with the top of the coating coating roller during the knife over roll coating.

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