JP2009001933A - Water-repellent fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-repellent fabric having water repellency with excellent durability by firmly sticking a film consisting essentially of a fluorine-based water-repellent agent on a fabric consisting essentially of a polyester yarn. <P>SOLUTION: The first embodiment is the water-repellent fabric obtained by covering one surface or both surfaces of the fabric consisting essentially of the polyester yarn with the film containing a polyester-based resin and the fluorine-based water repellent. The second embodiment uses a fabric not subjected to water-repellent finishing as the fabric consisting essentially of the polyester yarn in the water-repellent fabric. In each embodiment, the polyester-based resin is preferably an aqueous saturated polyester resin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water-repellent fabric having water and oil repellency and the like used for various apparel applications such as sportswear and casual wear and various rain gear applications such as umbrellas.

  The water repellent fabric is usually obtained by applying a paraffinic water repellent, a silicon water repellent or a fluorine water repellent to the fabric. Among these, the fluorine-based water repellent is excellent in oil repellency and antifouling property in addition to water repellency, and is also excellent in durability, so that it is often used mainly for outer materials. Silicone water repellents are often used as inner materials because they have a unique texture, touch and slip.

  There are a wide variety of fiber materials that can be applied to water-repellent processing, such as synthetic fibers such as nylon and polyester, semi-synthetic fibers such as diacetate and triacetate, and natural fibers such as cotton and wool. Since it is hydrophobic and its hydrophobicity approximates that of a fluorine-based water repellent, generally, a fluorine-based water-repellent fabric of polyester fiber fabric is most advantageous from the viewpoint of durability.

  In addition, when a fluorine-based water repellent or a silicon-based water repellent is applied to the fiber fabric, a method of appropriately using a melamine resin or an isocyanate compound in the water repellent solution for the purpose of improving durability against washing or friction. Is also adopted.

  The above method is particularly effective for a fiber fabric made of nylon or cotton. That is, by mixing the above compound, the fiber effect can be promoted to the anchor effect and the crosslinking effect between the fiber molecule and the water repellent reactive group, and as a result, the adhesion of the water repellent coating is improved, The peel resistance due to washing or friction can be improved.

  On the other hand, in the case of a polyester fiber fabric that is essentially excellent in durability of water repellency, not only the above effect can be expected, but there is a concern about rash of the body due to the occurrence of formalin or the like.

  In order to solve this problem, for example, Patent Document 1 discloses a water-repellent polyester fiber fabric coated with a fluorine-containing amino-modified silicon compound via a polyepoxide compound. In Patent Document 2, one surface of the fabric is coated with a fluorine-containing amino-modified silicon compound via a polyepoxide compound similar to Patent Document 1, and the other surface of the fabric is coated with a hydrophilic epoxy compound. A coated polyester fabric is disclosed. In any of these, when the fluorine-containing amino-modified silicon compound is adhered to the polyester fabric via the polyepoxide compound, a water-repellent coating having excellent adhesion and durability against washing and friction can be obtained.

In Patent Document 3, a treatment comprising a fluorine-based water / oil repellent, a vinyl copolymer containing an ethylenically unsaturated carboxylic acid and / or a derivative thereof as a copolymerization component, a softening smoothing agent, and a multifunctional crosslinking agent. Disclosed is a single-sided water-repellent fabric (the back surface is hydrophilic) formed by applying an agent to one side of a hydrophilic fiber-containing fabric.
JP-A-5-106171 JP-A-6-173171 Japanese Patent Publication No. Sho 63-31589

  However, in the techniques disclosed in these patent documents, as estimated from the examples, not only is the water repellency durability sufficient when the number of washings is increased to several tens of times, but also practical water repellency. The fact is that it cannot be demonstrated.

  The present invention has been made in view of the current situation as described above, and has excellent durability by firmly bonding a coating mainly composed of a fluorine-based water repellent on a fabric mainly composed of polyester yarn. It is a technical problem to provide a water-repellent fabric having water-repellent performance.

  As a result of intensive studies to solve the above problems, the inventor of the present invention, when forming a water-repellent coating on a fabric, together with a polyester resin, the adhesive strength of the coating is dramatically improved and durability is improved. The inventors have found that an excellent water-repellent fabric can be obtained and have reached the present invention.

  That is, the first aspect of the present invention is a water repellency characterized in that one side or the whole surface of a fabric mainly composed of polyester yarn is coated with a film containing a polyester resin and a fluorine water repellent. The gist is a fabric.

  The gist of the second embodiment is that the non-water-repellent fabric is used as the fabric mainly composed of polyester yarn in the water-repellent fabric.

  And in this invention, in any said form, it is contained as a preferable aspect that a polyester-type resin is a water-system saturated polyester resin.

  In the water-repellent cloth of the present invention, the polyester resin excellent in adhesiveness or adhesion is used as a bridging agent, and the fluorine-based water repellent is adhered to the cloth mainly composed of polyester yarn. Is extremely good, and the water-repellent fabric exhibits water-repellent performance with excellent durability.

  Further, if a non-water-repellent fabric is used as a fabric mainly composed of polyester yarn, the water-repellent fabric of the present invention can be provided with functionality other than the water-repellent performance.

  Hereinafter, the present invention will be described in detail.

  In the present invention, the fabric mainly composed of polyester yarn is a fabric containing 50% by mass or more, preferably 80% by mass or more of polyester yarn represented by polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate and the like. A knitted fabric, a non-woven fabric, and the like, and a fabric formed only of polyester yarn is most preferable. As other yarns that form a fabric together with polyester yarns, any yarn can be used, for example, polyamide yarns such as nylon 6, nylon 6, 6, etc., polyacrylonitrile, polyvinyl alcohol, diacetates, triacetates, etc. Examples include synthetic fiber yarns. In the present invention, these yarns are used singly or in a mixed or knitted or knitted form.

  The first form of the water-repellent fabric in the present invention is one in which one side or the entire surface of a fabric mainly composed of polyester yarn is coated with a film containing a polyester resin and a fluorine-based water repellent.

  Specifically, it means that one side or the entire surface of the fabric is water-repellent, and as a means of water-repellent processing, in the case of one side, printing method, spray method, coating method, gravure coating method, foam processing On the other hand, in the case of the entire surface, there are a padding method and means for applying the water repellent treatment on one side to the front and back surfaces, respectively.

  As specific water repellency, the water repellency measured according to JIS L1092 is preferably 4th or higher.

  As the fluorine-based water repellent used in the present invention, an intermediate such as sulfonic acid or alcohol having a perfluoroalkyl group synthesized by a known electric field fluorination method or telomerization method is used. Perfluoroalkyl acrylate or perfluoromethacrylate obtained by derivatizing with ester and vinyl monomer such as vinyl chloride, vinyl acetate, acrylonitrile, ethyl acrylate, methyl methacrylate, stearyl acrylate, adipic acid, acrylamide, etc. And a water repellent containing the resulting polymer. Commercially available products include “Asahi Guard AG7000 (trade name)”, “Asahi Guard AG 970 (trade name)”, “Asahi Guard GS10 (trade name)” (all manufactured by Asahi Glass Co., Ltd., fluorine-based water repellent emulsion), “NK guard FGN700T (trade name)”, “NK guard NDN 7000 (trade name)” (both manufactured by Nikka Chemical Co., Ltd., fluorine-based water repellent emulsion), and the like.

  In the present invention, from the viewpoint of improving the texture and slipping feeling of the fabric, a silicon water repellent may be used simultaneously with the fluorine water repellent. Examples of the silicon-based water repellent include methylhydrodiene polysiloxane-based water repellent, dimethylpolysiloxane-based water repellent, and the like, but considering the heat resistance of water-repellent fabrics, etc. An agent is preferably used. Furthermore, in the present invention, from the viewpoint of improving durability and reactivity, a catalyst comprising an organic acid metal salt such as dibutyltin laurate or iron octate, or a urea-based resin may be used in combination. The amount of the silicon water repellent used is preferably less than the fluorine water repellent in terms of solid content.

  In the present invention, the water repellent as described above is used. The amount of the water repellent is preferably 0.1 to 2.5% by mass, more preferably in terms of solid content, with respect to the fabric mainly composed of polyester yarn. 0.2 to 1.5 mass. If it is less than 0.1% by mass, it is difficult to obtain a sufficient water repellency. On the other hand, if it exceeds 2.5% by mass, not only the texture is impaired but also the improvement of the water repellency is difficult to expect.

  In the present invention, it is necessary to use not only a fluorine-based water repellent but also a polyester resin when performing water-repellent processing. Thereby, such a film can be firmly adhered onto a fabric mainly composed of polyester yarn. The reason for this is that when water-repellent processing is performed using a fluorine-based water repellent and a polyester-based resin, the polyester-based resin is changed from a fluorine-based water repellent to a polyester fiber fabric due to the SP value (solubility parameter) and the like. On the other hand, it is easy to bond preferentially and exhibits a so-called anchor effect. That is, it is assumed that the polyester resin bridges the fabric and the water repellent, and as a result, a film having a strong adhesive force can be formed.

  The polyester-based resin that can be used in the present invention may be any synthetic polymer as long as the bonding portion between the monomers is mainly an ester bond. The resin form may be a hot-melt type or an organic solvent-based type. And water-based type. However, in consideration of compatibility with the water repellent agent, environmental aspects, general versatility, and the like, an aqueous type resin that does not contain an organic solvent or contains only a small amount even if it is contained can be preferably used.

  Known water-based technologies for obtaining water-based resins include self-emulsifying technology that introduces hydrophilic groups into the skeleton of resin molecules to make it water-based, and forced emulsification technology that forcibly emulsifies with an emulsifier. However, in the present invention, a resin obtained by a self-emulsification type technique can be preferably employed from the viewpoint of water resistance and film-forming property of the resin. Examples of the resin obtained by this self-emulsification type technique include water-based saturated polyester resins, and commercially available products include “Plus Coat Z-850 (trade name)” and “Plus Coat Z-730 (trade name)”. (All are manufactured by Kyodo Chemical Industry Co., Ltd.), “Aronmelt PES-1055A30 (trade name)”, “Aronmelt PES-2005A30 (trade name)” (all manufactured by Toa Gosei Co., Ltd.), and the like.

  The amount of the polyester-based resin applied is preferably 0.01 to 2.00% by mass, more preferably 0.03 to 1.00% by mass in terms of solid content, with respect to the fabric mainly composed of polyester yarn. . If the amount is less than 0.01% by mass, the effect of adding a polyester resin is poor. On the other hand, if it exceeds 2.00% by mass, the water repellency of the fabric may be deteriorated.

  The mass ratio of the water repellent to the polyester resin (water repellent / polyester resin) is preferably 100/50 to 100/5, more preferably 100/30 to 100 in terms of solid content. / 10. When the mass ratio exceeds 100/5 and the polyester resin is reduced, the effect of adding the polyester resin is poor. On the other hand, when the polyester resin is increased below 100/50, the water repellency of the fabric may be deteriorated. Yes, neither is preferred.

  In the present invention, both the water repellent and the polyester resin described above are used. From the viewpoint of more firmly attaching the water repellent to a fabric mainly composed of polyester yarn, it is preferable to use an isocyanate compound in combination. As the isocyanate compound, 3 moles of tolylene 2,4-diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, and these diisocyanates and an active hydrogen-containing compound (for example, trimethylolpropane, glycerin, etc.) Triisocyanates obtained by addition reaction with can be used. In addition, when it is preferable to consider the stability and pot life of the resin solution, a blocked isocyanate that is formed by forming an additional block with phenol, lactam, methyl ketoxime, etc., and dissociates by heat treatment may be used.

  The mass ratio of the isocyanate compound (sum of water repellent and polyester resin / isocyanate compound) is preferably 100/80 to 100/5 in terms of solid content. When the isocyanate compound is less than the mass ratio of 100/5, the effect of adding the isocyanate compound is poor. On the other hand, when the amount of the isocyanate compound is less than 100/80, it is difficult to contribute to improving the durability of the water-repellent coating. There is a tendency that the texture and various fastnesses of the fabric are liable to be deteriorated, and neither is preferable.

  In the present invention, for the purpose of improving the durability of the water-repellent coating, a melamine resin curing catalyst comprising an inorganic acid salt such as ammonium phosphate together with a melamine resin such as trimethylol melamine may be used. However, since the use of melamine resin may cause a slight amount of formalin, it is preferable to sufficiently consider the use of the fabric.

  The mass ratio of the melamine resin (water repellent / melamine resin) is preferably 100/10 to 100/1 in terms of solid content, and the mass ratio of the curing catalyst (melamine resin / curing catalyst for melamine resin) Preferably, the solid content is 100/30 to 100/1. If the resin and catalyst are used outside the above ranges, the durability of the water-repellent coating tends not to be expected, which is not preferable. In particular, if the amount of melamine resin used is too large, the texture of the fabric tends to harden.

  Thus, the first embodiment of the present invention is a water-repellent fabric formed by coating one side or the entire surface of a fabric mainly composed of polyester yarns with a film containing a polyester-based resin and a fluorine-based water repellent. .

  Here, the manufacturing method of the water-repellent fabric according to the first embodiment will be described.

  As a typical method for producing this water-repellent fabric, first, a fabric mainly composed of polyester yarn is dyed and finished by ordinary means. Next, a resin solution containing a fluorine-based water repellent and a polyester resin is prepared, and water-repellent processing such as the coating method described above is performed. At this time, when only one side of the fabric is subjected to water repellent finish, only the one side is subjected to water repellent finish, and in the case of the entire surface, the padding method or the above-described water repellent finish is applied to each of the front and back surfaces.

  In particular, when only one side of the fabric is water-repellent, a coating method such as knife coating is preferably employed. In this case, it is preferable to set the viscosity of the resin solution to 2000 to 20000 mPa · s from the viewpoint of suppressing the penetration of the resin solution from the surface to be water repellent processed to the surface (opposite surface) that is not the target. The viscosity can be set in such a range by adding a thickener in the resin solution. Examples of the thickener include water-soluble polymers such as carboxymethylcellulose and sodium carboxymethylcellulose. It is done. By using such a resin solution, the viscosity and amount of the resin solution can be easily managed. For example, by appropriately adjusting the shape or the like of the coating blade, the degree of penetration into the opposite surface of the fabric can be controlled. Furthermore, since the application of the resin solution can be concentrated only on the surface to be subjected to the water-repellent processing, the water-repellent processing can be performed with a low-concentration / small amount of the resin solution. Even if the thickness of the fabric is thin, the penetration of the resin solution into the opposite surface can be suppressed.

  Further, the water-repellent processing is not limited to one-step processing, and multi-step processing may be adopted depending on the purpose. As multi-stage processing, first, one side or the entire surface of a fabric is processed using a resin solution containing a polyester-based resin or a resin solution containing a polyester-based resin and an isocyanate compound, and subsequently a fluorine-based water repellent is included. The method of processing the single side | surface or the whole surface of a fabric similarly using a resin solution can be illustrated.

  Here, when comparing one-step processing and multi-step processing, the latter tends to be expensive in terms of cost, and there is almost no difference between the two as a rule of thumb when compared in terms of the adhesive strength of the water-repellent coating. .

  After the application of the resin, it is usually dried and cured. As conditions, the drying is preferably 50 to 150 ° C. for 1 to 10 minutes, and the curing is preferably 150 to 180 ° C. for 20 seconds to 3 seconds. For minutes. The water-repellent fabric of the present invention can be obtained through the above water-repellent processing.

  Next, the second embodiment of the present invention will be described. The second embodiment is an embodiment in which a non-water-repellent fabric is used as the fabric mainly composed of the polyester yarn.

  The non-water-repellent fabric referred to in the present invention refers to a fabric on which functional processing other than water-repellent processing is performed on at least one side.

  Specific examples of functional processing include the provision of moisture absorption performance, moisture absorption / release performance, water absorption performance, etc. by coating methods and spray methods, and the addition of deodorization performance, deodorization / antibacterial performance, water absorption performance, etc. by padding methods, etc. The water absorption performance, the antistatic property, the antibacterial performance, the flame retardancy performance, etc., which are performed simultaneously with the dyeing finish, etc. are mentioned, but are not limited thereto.

  Even in the second embodiment of the present invention, one side or the entire surface of the fabric mainly composed of polyester yarn is water-repellent as in the first embodiment, but in the second embodiment, only one side is water-repellent. An embodiment in which is performed is preferable. This is because fabrics having different functions (water repellent performance and other functions) on the front and back surfaces generally have a high commercial value.

  As a method for producing the water-repellent fabric according to the second embodiment, the case of the water-repellent fabric according to the first embodiment may be basically applied. Of course, even when only one surface is subjected to water-repellent processing, water-repellent processing by a coating method is preferably employed using the resin solution having the specific viscosity range described above. As described above, when such a resin solution is used, since the penetration of the resin solution into the opposite surface can be suppressed, it is difficult to impair the functionality of the opposite surface.

Next, the present invention will be described in more detail with reference to examples. The measurement and evaluation of the performance of the water-repellent fabric in the examples were based on the following methods.
(1) Water repellency: evaluated by JIS L1092, spray method.
(2) Washing durability: Washing according to JIS L0217 (Method 103) was continuously performed 50 times, and the water repellency after tumbler drying at 60 ° C. for 20 minutes was evaluated by the method described in (1).
(3) Wear durability: The water repellency after 1000 wears according to JIS L1018, Method A (22.3N for both tensile load and pressing load) was evaluated by the method described in (1).
(4) Water absorption performance: The fabric surface not covered with the coating was evaluated by JIS L1907, dropping method.

(Example 1)
Weaving a plain weave with a warp density of 120 / 2.54cm and a weft density of 80 / 2.54cm using polyester yarn 83dtex72f made of PET as the weft, and dyeing finish by the usual method (dye used: Dystar Japan) Manufactured by Dianix Blue UN-SE 1% omf), and a fabric mainly composed of polyester yarn was prepared.

  Subsequently, padding (squeezing rate 40%) was performed using a resin solution of the following formulation 1, dried at 110 ° C. for 2 minutes, and then cured at 170 ° C. for 40 seconds. The entire surface was coated with a polyester resin and a fluorine-based water repellent. A water-repellent fabric of the present invention was obtained, which was coated with a film containing

<Prescription 1>
80 parts by weight of Asahi Guard AG7000 (made by Asahi Glass Co., Ltd., fluorine-based water repellent emulsion with a solid content of 20% by weight)
Pluscoat Z-850 10 parts by mass (manufactured by Kyoyo Chemical Co., Ltd., water-based saturated polyester resin having a solid content of 25% by mass)
Isopropyl alcohol (permeability improver) 30 parts by weight water 880 parts by weight

(Comparative Example 1)
A comparative water-repellent fabric was obtained in the same manner as in Example 1 except that “Plus Coat Z-850 (trade name)” was excluded from Formulation 1.

(Example 2)
After preparing a fabric mainly composed of polyester yarn by the same method as in Example 1, a resin solution of the following formulation 2 (viscosity: 7000 Pa · s / 25 ° C.) was applied to one side of the fabric by knife coating at an amount of 30 g / m ^2. Applied. Then, after drying at 110 ° C. for 1 minute, curing was performed at 170 ° C. for 40 seconds, and a water-repellent fabric according to the present invention was obtained in which one side was coated with a film containing a polyester resin and a fluorine-based water repellent. .

<Prescription 2>
100 parts by weight of Asahi Guard AG7000 (manufactured by Asahi Glass Co., Ltd., fluorine-based water repellent emulsion with a solid content of 20%)
Pluscoat Z-730 30 parts by mass (manufactured by Kyoyo Chemical Industry Co., Ltd., aqueous saturated polyester resin having a solid content of 25% by mass)
Meikanate WEB 20 parts by mass (Madeari Chemical Industry Co., Ltd., block isocyanate for Asahi Guard)
AG Visco Sizer 55 (5% by weight aqueous solution) 650 parts by mass (made by Meisei Chemical Industry Co., Ltd., thickener for Asahi guard coating)
200 parts by weight of water

(Example 3)
A water-repellent fabric of the present invention was obtained in the same manner as in Example 2, except that 3% omf was applied to the water-absorbing processing agent (manufactured by Takamatsu Yushi Co., Ltd., “SR1000 (trade name)”) at the time of dyeing finish. The water absorption performance of the dyed fabric was 7.5 seconds.

(Comparative Example 2)
A comparative water-repellent fabric was obtained in the same manner as in Example 2 except that “Plus Coat Z-730 (trade name)” was excluded from Formulation 2 of Example 2.

  The performance of the water-repellent fabrics obtained in the above Examples and Comparative Examples was measured, and the results are shown in Table 1.

As is clear from Table 1, the water-repellent fabric according to the example has the same initial water repellency as the fabric according to the comparative example, but after washing and wear, the water-repellent performance is higher than that of the fabric according to the comparative example. The result was excellent in durability. Moreover, in the water repellent fabric according to Examples 2 and 3, the resin solution penetrated less into the opposite surface of the fabric (surface not subject to water repellent processing). Therefore, in Example 3, the water absorption performance of the opposite surface was maintained.

Claims (3)

  A water-repellent fabric characterized in that one side or the whole surface of a fabric mainly composed of polyester yarn is coated with a film containing a polyester-based resin and a fluorine-based water repellent.   The water-repellent fabric according to claim 1, wherein the fabric mainly composed of the polyester yarn is a non-water-repellent fabric. The water-repellent fabric according to claim 1 or 2, wherein the polyester resin is an aqueous saturated polyester resin.