JPS6312765A - Functional cloth and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a functional fabric and a method for producing the same, and particularly to a method for imparting various functions such as moisture permeability and waterproofness to a fiber fabric, and the functions thus obtained. Regarding sex fabrics.

<Prior Art> Various methods of imparting various functional drugs to fabrics have been studied in the past. As an example, the development of moisture-permeable and waterproof fabrics using coating technology has been actively promoted in recent years, and their commercialization into raincoats, sports clothing, casual coats, ski wear, mountain climbing equipment, etc. is rapidly progressing.

For example, many coated fabrics have been developed in which resins such as polyurethane, silicone, and acrylic are coated using dry or wet methods to provide functions such as moisture permeability, waterproofness, and water repellency. Various additives are also being added to coating resins to enhance their functionality. In addition, coated fabrics made by these methods have moisture permeability,
In addition to waterproofness and water repellency, attempts have also been made to add other functions through post-processing to make it more versatile.

However, conventionally known functional fabric manufacturing techniques have several drawbacks.

Taking moisture-permeable waterproof fabric as an example, water repellents, crosslinking agents, moisture absorbers, etc. are added to the coating resin liquid in order to impart properties such as W permeability, waterproofness, adhesion between fibers and coatings, and moisture absorption properties. However, due to the stability of the coating resin liquid, there are restrictions on the type and amount of additives that can be mixed, and there are many difficulties in achieving more sophisticated functionality. accompanied by. In addition, if you want to add other functions to a moisture-permeable and waterproof fabric to make it multifunctional, you can pre-treat the fabric to be coated with these functional chemicals, or you can add them by post-processing the coated fabric. Ta. However, pre-processing or post-processing is unreasonable from a cost perspective, and coating them is too expensive! Even if an attempt is made to apply it by coating, most of the coating resins are difficult to miscible with the coating resin liquid, making it extremely difficult to apply it effectively.

<Problems to be Solved by the Invention> The purpose of the present invention is to solve the problems of the prior art as described above, and in particular to improve the characteristics of various functional drugs without the above-mentioned drawbacks (more advanced The purpose of this invention is to further advance the sophistication and multifunctionality of coated fabrics and to impart these functions more rationally.

Means for Solving the Problems> An object of the present invention is to provide a fabric with a porous resin coating on at least one side of the fabric, and to provide a fabric with a porous resin coating, in which a small number of pores (some of which contain a functional drug) constituting the porosity are provided. A functional fabric characterized by: a composition comprising a porous microcapsule containing a functional drug and a coating resin, which is coated on at least one side of the fabric, and then heat-treated to form a film. This can be achieved by a method for manufacturing a functional fabric.

The present invention will be explained in more detail below.

In the present invention, fabrics include polyamide, polyester,
Synthetic fibers such as polyacrylic and their modified fibers,
A sheet-like material made of natural fibers such as wool, silk, cotton, and linen, semi-synthetic fibers such as acetate and rayon, or a mixture of these fibers, and refers to textile fabrics such as woven and knitted fabrics and non-woven fabrics.

Before coating with the coating resin liquid, such a fabric is coated with:
Depending on the type of fabric, water-repellent finishing, calendering, undercoating, etc. may be applied. Furthermore, before coating, the fabric may be lightly raised using a puff raising machine, a needle cloth raising machine, etc. in order to improve the adhesion with the coating film.

The coating resin that forms the coating film in the present invention (not limited to polyurethane, any coating resin such as silicone resin, fluorine resin, polyamide type, polyester type, acrylic type, etc.) is suitable.

In the present invention, the porous microcapsules can be porous as long as they have pores communicating with the surface, even if they are hollow inside.
Although the shape and structure of the pores in materials such as pumice are not particularly limited, they are typically spherical with a microporous outer shell and a cavity inside. contains a functional drug. The particle size of this microcapsule is not particularly limited, but the average particle size is 0.5 to 20.
0 μ, more preferably 1 to 80 μ, even more preferably 3
~30μ is preferred. If it is too small, agglomerations will occur when mixed with the coating resin liquid, and these agglomerates will tend to appear as streak-like defects during coating.If it is too large, the coating film will become brittle or waterproof. The drawback is that it declines. The microporous structure of the outer shell of the microcapsules communicates with the internal cavity, and the average diameter of the pores is between 0.001 and 20μ, especially between 0.000μ and 0.00μ.
5-2μ is preferable. This micropore is contained within the microcapsule internal cavity. A microcapsule with a diameter that allows the functional drug to be stably retained inside the cavity and easily diffused to the outside of the microcapsule by heat treatment or the like should be selected. Some of the internal cavities of microcapsules include one cavity with a small diameter that is almost concentric with the microcapsule, and others with many cavities that are smaller than the diameter of the microcapsule and larger than the micropores in the outer shell. The porosity of this microcapsule is usually 5 to 95%, preferably 20 to 80%.
, more preferably 40 to 60%, and the functional drug is contained in the pores. Depending on the manufacturing method,
In some cases, some functional drug may be attached to the outer periphery of the microcapsule.

The components forming the microcapsules are not particularly limited, and may be inorganic or organic, but those that do not dissolve in the coating composition during coating should be used. Inorganic substances include silica, silicic acid, diatomaceous earth, quartz, siliceous sandstone,
Examples include silicates such as calcium silicate, zirconium silicate, and clay, alumina, calcium carbonate, magnesium carbonate, kaolin clay, finely divided talc, titanium oxide, iron oxide, carbon black, and activated carbon. Examples of the organic substance include acrylic resin, acrylic styrene copolymer resin, epoxy resin, polyester, polyamide, polyacrylonitrile, polyurethane, and fluororesin. Among these, microcapsules made of Schiff's strength, acrylic resin, acrylic styrene copolymer resin, etc. are preferred.

Functional drugs contained inside microcapsules are liquids or solids that have some function, and when heat-treated, these functional drugs diffuse outside the capsule through expansion, vaporization, etc., and remain inside the capsule. Or,
A portion remains inside the capsule and imparts the functions of those drugs to the coating film. Specific functional chemicals include water repellents, adhesives, softeners,
Examples include antistatic agents, antifouling agents, water absorbing agents, moisture absorbing agents, and surface smoothing agents. Two or more of these functional drugs may be mixed and contained in microcapsules.

There are no particular restrictions on the method for containing the functional drug in the microcapsules. For example, a method of immersing microcapsules in the usual drug solution, or a method of immersing the microcapsules in a vacuum (
There is a method of suctioning the drug using reduced pressure.

In the present invention, a fabric is coated with a coating composition containing such drug-containing microcapsules, and then heat-treated to diffuse at least a part of the drug to the outside of the capsule. A method is used in which heating is carried out to a temperature of 100%, preferably to the boiling point. In order to effectively exert such an effect, it is preferable to use not only the original drug component but also an appropriate solvent, especially a low boiling point compound, to adjust the boiling point. Therefore, the functional drug referred to in the present invention does not contain such a solvent. It also includes coexisting conditions.

As such a solvent, for example, a low boiling point solvent having a boiling point near the film forming temperature conditions, particularly one having compatibility with the functional drug, is preferably selected.

For example, there are commonly used solvents (including mixed solvents) such as water, methanol, ethanol, isopropyl alcohol, MEK, THF, trichlene, and percrene, which are selected according to their compatibility with the functional agent used and the processing conditions. do.

Therefore, from the viewpoint of performance-imparting properties, it is preferable that the functional agent as used in the present invention is liquid as a whole, but it is not necessarily limited to being liquid, and may be dissolved or dispersed in a solvent. In particular, there is no difference in efficacy between sublimable drugs and liquid drugs. For example, antifouling agents, insect repellents, insecticides,
Deodorants (deodorants, such as iron-phthalocyanine, iron-ascorbic acid deodorizers, Arken liquid), odor-imparting agents (perfume, fragrance), etc. can also be applied to the present invention.

In the present invention, microcapsules containing such drugs are
The coating composition mixed with the coating resin liquid is coated, and the amount of the microcapsules added at this time is 01 to 200 parts by weight, particularly 1 to 100 parts by weight, based on 100 parts by weight of the solid coating resin. It is preferable if there is.

If it is too small, the effect will be reduced, and if it is too large, the film will become brittle. When adding the microcapsules to the coating composition, microcapsules containing different functional drugs may be mixed. The coating composition may contain other additives to improve film properties and other physical properties.

Concentrations of the coating composition (ranging from 1 to 40% by weight, preferably from 10 to 25% by weight) are applied.The viscosity of such solutions is from 50 to so, oo.

Qp! J, preferably 100 to 30.0OOcps.

The coating composition is usually prepared by dissolving the coating resin in an organic solvent, forming an emulsion, an aqueous solution, or dissolving it by heat, and dispersing the above-mentioned microcapsules therein. Coating methods are not particularly limited, but generally include floating knife coater, knife over roll coater, reverse roll coater, roll doctor coater, gravure roll coater, air knife coater, curtain coater, kiss roll coater, nip roll coater, and casting. coater, con-arrival coater, con-arrival coater,
A slit coater, spray type, etc. can be used. Additionally, a laminating method and a bonding method can also be used. After coating, a film is formed using a wet method or a dry method.

When the coating film is formed by a wet method, water or an aqueous solution consisting of water and a polar organic solvent such as dimethylformamide is preferably used as the coagulation bath. After the coagulation bath treatment, the membrane is generally washed with hot water to remove the organic solvent in the membrane, followed by drying and heat treatment.

When forming a coating film by a dry method, heat treatment is performed immediately after application. In performing this heat treatment, the heat treatment may be performed immediately at a high temperature, or the temperature may be increased stepwise from a low temperature.

Further, after forming the coating film, water-repellent processing, processing to impart other functionality, or physical processing such as calender processing and cam-fit processing may be performed.

In the present invention, it is necessary to perform heat treatment at some stage after coating the fabric with the coating composition to diffuse a part of the drug in the microcapsules to the outside of the microcapsules by expansion, vaporization, boiling, etc. of the drug itself or the coexisting solvent. be. When using the above dry method, this can also be done during the heat treatment. There are no particular restrictions on the method of heat treatment, including dry heat treatment, steaming, electron beam irradiation, ultraviolet irradiation,
Infrared irradiation, treatment in a bath, etc. may also be used. By performing such heat treatment, as described above, the functional drug contained inside the microcapsules diffuses to the outside of the microcapsules and remains inside the coating, and a portion remains inside the microcapsules. The functions of the functional drug contained in the microcapsules can be effectively imparted to the coated fabric without any adverse effects caused by the drug during the production of the coating film.

<Example> Examples 1 and 2. ．． 3. Comparative Examples 1 and 2 Warp denier 70 denier 12 filament, weft denier 24
After dyeing nylon taffeta with a filament yarn density of 120 threads/inch and weft thread density of 90 threads/inch using a conventional method, a commercially available fluorine-based water repellent (Asahi Guard AG-71) was dyed.
0 Asahi Glass) Pad in 10g/l bath, after drying, 170
Dry heat treatment was performed at ℃ for 1 minute.

Resin liquid (A) Urethane Ni or 10 weight bearing parts 04 parts by weight A resin liquid obtained by adding the resin liquid (A) and microcapsules having microporous voids containing the functional drugs shown in Table 1 to the fabric. Coating thickness 15 with comma direct coater
After coating on 0μ, dry at 130℃ for 3 minutes, then dry at 170℃
A dry heat treatment was performed for 1 minute.

As comparative examples, microcapsules containing microporous pores containing a functional drug were not added to the resin liquid (A), and microcapsules containing microporous pores containing no functional drug were added to the resin liquid (A), and microcapsules were prepared using the same microcapsules as in Example 2, but with microporous pores containing no functional drug. The microcapsules added thereto were processed in the same manner as in Examples 1, 2, and 3 above. Table 1 shows the physical property evaluation results of the obtained coated fabric.

In Examples 1, 2, and 3, coated fabrics with excellent moisture permeability, water resistance, and water repellency were obtained.

In comparison, Comparative Example 1 had low moisture permeability and water repellency, and Comparative Example 2 had very low water resistance and water repellency.

Examples 4 and 5. Comparative Example 3 Using the same treated fabric as in Examples 1, 2, and 3, a microporous resin solution (B) containing urethane resin: 10 parts by weight of the above resin solution CB) and the functional agent shown in Table 2 was prepared. The resin solution containing microcapsules with voids was coated with a floating knife coater at a coating amount of 5 g/
After applying rn', dry at 130℃ for 3 minutes, then dry at 170℃
A dry heat treatment was performed for 1 minute.

As a comparative example, the functional drugs contained in microcapsules having microporous voids in Examples 4 and 5 were directly added to the resin solution (
An attempt was made to process the material added to B) in the same manner as in Examples 4 and 5 above, but the resin liquid hardened before coating, making coating impossible.

The physical property evaluation results of the coated fabrics of Examples 4 and 5 were
Shown in the table.

In Examples 4 and 5, although the moisture permeability was excellent, there was little significant decrease in water resistance and peel strength, and coated fabrics with very thick layers were obtained.

Table 2: Evaluations of moisture permeability, water resistance, peel strength, and water repellency are based on JIS 20208. JIS L1079, J
Measured according to IS L1066 and JIS L1092.

<Effect of the invention> The present invention can provide the following effects.

(1) Even functional drugs that are difficult to mix with coating resins can be mixed and used effectively.

(2) Process rationalization and cost reduction can be achieved.

(3) Various functions can be imparted to the coated fabric.

(4) It should be possible to apply drugs with good durability even if the elution function is degraded by washing, dry cleaning, etc.

Patent applicant: Azuma Co., Ltd. 15, Agent: P.Y. 4: Patent attorney: Ryo Kawase
・ ゝ・ (hen ′ −n/

Claims (2)

[Claims] (1) having a porous resin coating on at least one side of the fabric;
A functional fabric characterized in that at least some of the pores constituting the porosity contain a functional drug. (2) A method for producing a functional fabric, which comprises applying a composition consisting of porous microcapsules containing a functional drug and a coating resin to at least one side of the fabric, and then heat-treating it to form a film.