JP2006152508A - Antifouling fiber structure and processing method thereof - Google Patents

Abstract

An antifouling fiber structure, a processing method thereof, and an antifouling garment using the fiber structure are provided by applying an antifouling agent having hydrophilicity and oil repellency to a fabric.
SOLUTION: A softening agent comprising a hydrophilic oil-repellent processing agent comprising a copolymer of a fluorine-based vinyl monomer, a polyalkylene glycol-containing hydrophilic vinyl monomer, and a non-polyalkylene glycol-based vinyl monomer, and a nonionic surfactant aqueous solution. An antifouling fiber structure obtained by applying a treatment liquid containing
[Effect] Good absorption due to sweat absorption, etc., excellent sebum-based dirt, and even when soiled, both water-based and oil-based soils can be easily removed by washing, and a detergent can be used. Even if it is not used, it is possible to provide a fabric that easily removes dirt and has excellent washing durability. In addition, it can be combined with various processes such as anti-wrinkle processing, skin care processing, antibacterial processing, and flexible processing.
[Selection] Figure 1

Description

  The present invention relates to an antifouling fiber structure, a processing method thereof, and an antifouling processing garment, and more specifically, a fiber structure having a high antifouling function, water absorption and excellent comfort, and a processing method thereof, The present invention relates to an antifouling garment that does not require a detergent and that can use the above-described fiber structure and can eliminate or substantially reduce the amount of detergent in the main laundry wastewater.

Conventional antifouling methods for textile products are roughly classified into two types: water- and oil-repellent antifouling and water-absorbing and oil-absorbing antifouling.
As the water / oil repellent antifouling treatment, a water / oil repellent containing a urethane compound having a fluorine-containing group is used (see Patent Document 1: JP-A-5-247451), or a fluorine having a hydrophilic group. By using together a water-based and oil-repellent agent and a non-hydrophilic fluorine-based water and oil repellent agent having a high fluorine content (see Patent Document 2: JP-A-10-317281), the flame retardancy and resistance of the fabric A method of imparting water and oil repellency without impairing properties such as frictional properties has been proposed, but the fabric obtained by the water and oil repellent antifouling process is excellent in that the stain component does not easily adhere to the fabric. Although it has antifouling property, once it adheres, it has a drawback that the dirt component is difficult to be removed by washing, does not absorb sweat, and the texture becomes hard, so that it is not comfortable to wear.

  On the other hand, a water-absorbing and oil-absorbing antifouling process generally has an effect of preventing recontamination by making the dough hydrophilic so that dirt components can be easily removed. However, the water-absorbing / oil-absorbing antifouling process can provide a good anti-fouling prevention effect on hydrophobic polyester, but hydrophilic cotton is less likely to re-contamination, and this process has little antifouling effect. In addition, the water-absorbing and oil-absorbing antifouling process has good comfort, but there is a problem that the sebum dirt adhering to the fabric cannot be removed sufficiently even after washing.

  In addition, for antifouling processing of dyed products, reactive dyed fiber structures dyed with reactive dyes are fixed to improve fastness, but this processing agent significantly reduces antifouling properties, A good antifouling treatment could not be performed on the reactive dyed fiber structure subjected to the fix treatment.

  By the way, in recent years, interest in environmental protection has increased, and many environmentally conscious products have been put on the market. Investigations are also underway on the environmental impact of domestic wastewater. It is said that detergents in laundry wastewater have the greatest impact on the environment in domestic wastewater. For this reason, washing machines that use zero electrolysis water or ultrasonic waves, or washing machines that can reduce detergents have been manufactured. However, in the prior art, no clothes with good stain removal were obtained even if the detergent was zero or the detergent was reduced.

  In addition, changes in lifestyle can be cited as the background of the invention of these washing machines. In other words, with the advancement of the hygienic environment, clothes such as underwear worn daily are no longer as dirty as before, and the lifestyle has changed from the conventional “wash when dirty” to “wash when worn”, so washing even with zero detergent is possible. Because it was thought that it was possible.

  However, even if the underwear looks at first glance unclean, sebum components that are not visible remain, and when washed without detergent, sebum components that remain after repeated wear-washing accumulate, Problems with yellowing, yellowing and odor occur. Accordingly, there has been a demand for apparel such as underwear that has little residual sebum stains and is less likely to cause yellowing or odor even after washing with zero or no detergent.

As prior art documents related to the present invention, there are the following.
JP-A-5-247451 Japanese Patent Laid-Open No. 10-317281 Japanese Patent Laid-Open No. 9-2416622 JP 2003-96673 A JP 2003-105675 A JP-A-6-10274

  The present invention has been made in view of the above circumstances, and by applying an antifouling agent having good hydrophilicity and oil repellency to the fabric, hydrophilic soil such as sweat is easily absorbed by the fabric, It can be easily removed and oil components such as sebum can be prevented from penetrating into the fabric, and even if oil components adhere, it can be easily removed by washing without using detergent. Antifouling fiber structure capable of effectively preventing soiling of the fabric, effectively preventing soiling of the fabric, having good water absorption, soft texture, and excellent comfort It is an object to provide a method and an antifouling garment using the fiber structure.

  As a result of intensive studies to achieve the above object, the present inventors have found that a copolymer obtained by polymerizing a fluorine-based monomer having a water- and oil-repellent effect and a hydrophilic monomer in a specific ratio is within the optimum range. By treating the fabric with an antifouling agent used in combination with a specific concentration of chemicals, a fabric with the characteristics of sucking water and repelling oil can be obtained, resulting in sweating. However, since the fabric absorbs moisture, it is comfortable to wear, hydrophilic stains such as sweat can be easily removed by washing, oil-based stains such as sebum can be prevented from penetrating into the fabric, It has been found that even if oil-based soil adheres to the fabric, the fabric can be easily removed by washing without using a detergent, so that a fabric with less residual sebum soil can be obtained. Moreover, when it used especially with respect to the reactive dyeing fiber structure which carried out the fix process, it discovered that the outstanding antifouling effect was exhibited and came to make this invention.

That is, the present invention
(1) A softening agent comprising a hydrophilic oil-repellent processing agent comprising a copolymer of a fluorine-based vinyl monomer, a polyalkylene glycol-containing hydrophilic vinyl monomer and a non-polyalkylene glycol-based vinyl monomer, and a nonionic surfactant aqueous solution. A fiber structure characterized by subjecting the fiber structure to a treatment liquid containing
(2) The fiber structure according to (1), wherein an antifouling agent comprising a hydrophilic polyester is added to the treatment liquid.
(3) The fiber structure according to (1) or (2), wherein a fixing agent containing diallylamine hydrochloride / sulfur dioxide copolymer is used for the reactive dyed fiber structure,
(4) The fiber structure according to any one of (1), (2), and (3), which prevents sebum stains from remaining in a laundry without using a detergent and prevents yellowing of clothes,
(5) The fiber structure according to (1), (2), (3), (4), which is within 60 seconds for water absorption (drop method) JIS L 1096,
(6) a hydrophilic oil-repellent finishing agent comprising a copolymer of a fluorine-based vinyl monomer, a polyalkylene glycol-containing hydrophilic vinyl monomer, and a non-polyalkylene glycol-based vinyl monomer, and a softening agent comprising a nonionic surfactant aqueous solution. An antifouling processing method for a fiber structure is provided, wherein a heat treatment is applied to the fiber structure after the treatment liquid is added to the fiber structure.

  According to the present invention, since it absorbs sweat and the like, it is excellent in comfort, sebum-based dirt is difficult to adhere, and even when dirt is attached, both water-based dirt and oil-based dirt can be easily removed by washing, Moreover, it is possible to provide a fabric that easily removes dirt without using a detergent and is excellent in washing durability. In addition, the method of the present invention can be combined with various processes such as a wrinkle-proof process, a skin care process, an antibacterial process, and a flexible process.

  The antifouling fiber structure according to the present invention comprises a hydrophilic oil-repellent finishing agent comprising a copolymer of a fluorine-based vinyl monomer, a polyalkylene glycol-containing hydrophilic vinyl monomer, and a non-polyalkylene glycol-based vinyl monomer, and nonionic properties. It is formed by treatment with a treatment liquid containing a softening agent comprising a surfactant aqueous solution.

  Here, examples of the fiber structure used in the present invention include yarn, cotton, woven and knitted fabric, and non-woven fabric. The fiber material constituting these fiber structures includes natural materials such as cotton, hemp, and wool. Examples thereof include semi-synthetic fibers such as fibers, viscose and rayon, and synthetic fibers such as polyester and nylon. These fibers can be used singly or in combination of two or more, as a woven fiber or the like.

  The fiber structure used in the present invention may be dyed or printed, and for example, a reactive dyed fiber structure dyed with a reactive dye can be used. Usually, a reactive dyeing fiber structure uses a fixing agent to improve dyeing fastness, but this fixing agent tends to reduce the antifouling property. Examples of the fixing agent include dicyan, polyethylene polyamine, and polycation. In particular, reactive dyeing fixing agents are often polycation-based, (1) epichlorohydrin dimethylamine addition polymer, (2) polydimethylaminoethyl methacrylate-based, (3) diallylamine hydrochloride / sulfur dioxide copolymer, (4) Diallyldimethylammonium chloride / sulfur dioxide copolymer, (5) diallylamine hydrochloride polymer, (6) diallyldimethylammonium chloride polymer, (7) monoallylamine hydrochloride polymer, (8) monoallylamine hydrochloride / diallylamine hydrochloride There are a salt copolymer, (9) diallyldimethylammonium chloride / diallylamine hydrochloride copolymer, and (10) a dialkylaminoethyl acrylate quaternary salt polymer.

  In the present invention, when imparting antifouling property to the reactive dyed fiber structure subjected to the fix treatment, the fix agent to be used has low cationicity and does not decrease the antifouling property among them, and the fastness is lowered. It is also important to select one having a molecular weight that is small enough to avoid such a problem. Specifically, diallylamine hydrochloride / sulfur dioxide copolymer is preferable.

  The antifouling fiber structure of the present invention is a hydrophilic repellent comprising the above-described fiber structure comprising a copolymer of a fluorine-based vinyl monomer, a polyalkylene glycol-containing hydrophilic vinyl monomer, and a non-polyalkylene glycol-based vinyl monomer. It can be obtained by treating with a treatment liquid containing an oil processing agent and a softening agent comprising a nonionic surfactant aqueous solution.

  In the present invention, the hydrophilicity and oil repellency can be further improved by using a hydrophilic compound in combination with the copolymer. Examples of the hydrophilic compound include nonionic surfactants and hydrophilic polyesters.

  Nonionic surfactants include, for example, (1) glycerin fatty acid esters, (2) pentaerythlit fatty acid esters, (3) sorbitan fatty acid esters, (4) polyethylene glycol fatty acid esters, and (5) polyethylene glycol alkyl ether interfaces. An activator is mentioned.

  The hydrophilic polyester includes (1) a compound in which a side chain of polyethylene glycol is bonded to polyester, (2) a copolymer polyester resin composed of dimethyl terephthalate, dimethyl isophthalate and polyethylene glycol, and (3) composed of dimethyl terephthalate and polyethylene glycol. Examples include copolymer polyester resins, (4) copolymer polyester resins composed of terephthalic acid, adipic acid, 5 sulfoisophthalic acid, and polyethylene glycol.

  The amount of these hydrophilizing compounds used is preferably 20 to 80% by mass with respect to the copolymer. If the amount used is too large, the antifouling effect may decrease, and if it is too small, the water absorption may decrease.

  In the present invention, various chemicals can be used in combination in order to improve practicality such as improvement in washing durability, flexibility and tear resistance for hydrophilic / oil repellency. Examples of such agents include resins / crosslinking agents, polyalkylene glycol-modified resins, nonionic emulsified oils, special reactive polyethylene derivatives, and the like.

  Specific examples of the resin / crosslinking agent include glyoxal-based resins, melamine-based resins, isocyanate-based crosslinking agents, and epoxy-based crosslinking agents. These can be used alone or in combination of two or more. Thereby, the cross-linking of the copolymer proceeds on the fabric, and the hydrophilic and oil-repellent washing durability can be remarkably improved.

  In this case, the amount of the resin / crosslinking agent used is preferably 50 to 400% by mass, more preferably 300 to 400% by mass, based on the copolymer. If the amount used is too large, there is no problem with the antifouling effect, but the fabric strength may decrease, and if it is too small, the antifouling effect may decrease.

  In the present invention, it is particularly preferable to use a glyoxal resin in combination, and specific examples include dimethylol dimethyloxyethylene urea, dimethylol hydroxyethylene urea, 1,3-dimethylglyoxal monourein and the like. .

  Examples of the melamine resin include trimethylol melamine and hexamethylol melamine.

  As the isocyanate-based crosslinking agent, triisocyanate compounds, diisocyanate compounds, polyisocyanate compounds and the like can be used. Specifically, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene triisocyanate, lysine ester triisocyanate, isophorone diisocyanate. , Hydrogenated xylylene diisocyanate, toluene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate and the like, and a triisocyanate compound which is a modified product of hexamethylene diisocyanate such as a trisburette modified product of hexamethylene diisocyanate is particularly preferable.

  Examples of the epoxy crosslinking agent include ethylene glycol glycidyl ether and sorbitol polyglycidyl ether.

  When a resin / crosslinking agent is used, it is preferable to use a metal salt or an organic acid as a crosslinking catalyst. Examples of the metal salt include ammonium borofluoride, sodium borofluoride, potassium borofluoride, and zinc borofluoride. And the like, and inorganic acids such as magnesium chloride, magnesium sulfate, and magnesium nitrate. Examples of the organic acid include citric acid, tartaric acid, malic acid, maleic acid and the like.

  Polyalkylene glycol-modified resins function to increase the hydrophilicity of the fiber structure and improve the absorption of moisture such as sweat. Specific examples include polyethylene glycol-modified polyester resins, polyethylene glycol-modified silicone resins, polyethylene glycol-modified urethane resins, polyethylene glycol-modified epoxy resins, and the like. These may be used alone or in combination of two or more. Can do.

  If the amount of polyalkylene glycol-modified resin used is too large, the antifouling effect may be reduced, and if it is too small, the water absorption may be reduced.

The copolymer, the hydrophilizing compound, and the agent to be added if necessary can be used as a solution dissolved in a solvent such as water , or as a treatment liquid in an emulsion or dispersion. In this case, the concentration of the copolymer is It is preferable to set it as 1-20 mass%, especially 3-10 mass%. If the concentration is too low, the antifouling effect may be reduced, and if it is too high, the antifouling effect may not be improved.

  The processing method of the present invention uses a treatment liquid containing the above-mentioned copolymer and attaches it to the fiber structure to carry out a hydrophilic oil-repellent processing. As a method of attaching the treatment liquid to the fiber structure, Examples thereof include a pad / dry method using a tenter, a liquid dyeing machine, a dipping method using a drum dyeing machine, etc. Among these, the pad / dry method can be preferably employed in terms of workability and cost. it can.

  In this case, the amount of the copolymer attached to the fiber structure is preferably 0.02 to 0.07% by mass, more preferably 0.03 to 0.06% by mass. If the adhesion amount is too small, the antifouling property may be lowered, and if it is too much, the antifouling effect may not be improved.

  Further, the adhesion amount of the drug (specifically, Softex N-491 (made by Kitahiro Chemical Co., Ltd.): nonionic surfactant) to the fiber structure is preferably 0.0014 to 0.021% by mass, more preferably. 0.005 to 0.01% by mass, and the amount of the drug (specifically, Permarin MR100 (manufactured by Sanyo Kasei Co., Ltd.): when hydrophilic polyester is used, the hydrophilic polyester) is attached to the fiber structure, 0.0035-0.05 mass% is preferable, More preferably, it is 0.01-0.035 mass%. If the adhesion amount of these agents (hydrophilic compounds) is too small, the water absorption may be lowered, and if too much, the antifouling property may be lowered.

  When the pad / dry method is adopted, the squeeze rate is appropriately selected depending on the amount of the copolymer and the agent finally attached to the fiber structure, and is adjusted so that the amount attached to the fiber structure is within the above-described range. . The drying is preferably at 80 to 180 ° C. for about 1 to 5 minutes.

  In the present invention, as described above, it absorbs moisture such as sweat, so it is comfortable to wear and can prevent the penetration of oil-based dirt. It is possible to obtain a fiber structure having excellent drop-off property without using a detergent even for oil-based soils that are difficult to remove. The antifouling fiber structure of the present invention can be suitably used in a wide range of fields as clothing products such as shirting, underwear, and uniforms, and bedding products.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, this invention is not limited to the following example.

[Example 1]
Cotton / polyester blended broad (Vertical 50 count x Horizontal 50 count / Vertical length 142 x Horizontal 76) The raw material that has been desizing, scouring, bleaching and mercerizing processed in the usual way is dipped in the processing solution of the following formulation and picked up The pad was treated at a rate of 70%, dried at 120 ° C. for 1 minute, and further cured at 160 ° C. for 2 minutes to adhere the treatment liquid to the dough.

<Anti-wrinkle + hydrophilic oil repellent antifouling agent treatment liquid formulation>
Ingredients Mixing ratio Pararesin NC-3 (Ohara Paradium Chemical Co., Ltd.) 5% by mass
Becamine LF-55P Conch (Dainippon Ink Chemical Co., Ltd.) 15% by mass
Catalyst GT-3 (Dainippon Ink Chemical Co., Ltd.) 3% by mass
Softex N-491 (Kitahiro Chemical Co., Ltd.) 1% by mass
Permarin MR100 (manufactured by Sanyo Chemical Co., Ltd.) 3% by mass

About the obtained processed cloth, water absorption and oil repellency were evaluated by the following methods, and a diamond paste and an oleic acid antifouling test were conducted. The results are shown in Tables 1 and 2. Moreover, the oleic acid residual rate was shown in FIG.
It measured by the water-absorbing JIS L 1096 dropping method. Within 60 seconds was accepted.
It was measured by the oil repellency AATCC 118-1979 method.

Dia paste antifouling test Measured according to the Japan Chemical Fiber Inspection Association standard "Ease of dirt removal (diamond paste method) JCFA TM104". Grade 3 or higher was accepted.
<Dirt fluid>
A liquid in which 1 g of the liquid blended at the following ratio was dispersed in 100 ml of motor oil was used.
Carbon black 16.7% by mass
Beef tallow oil 20.8% by mass
Liquid paraffin 62.5% by mass
<Test method>
1. 0.1 ml of the soil solution is dropped on the test piece, a load of about 7 gf / cm ² is applied, and the sample is left for 60 seconds.
2. Remove the load and wipe off any excess dirt with tissue paper.
3. Leave at room temperature for 1 hour.
4. Method 103 (JIS L 1042) Wash once.
5. After drying, the state of the stain remaining on the test piece is determined by a gray scale for contamination.

Red oleic acid antifouling test Oleic acid, a human body sebum component that adheres to dress shirts and underwear, was used.
<Dirt fluid>
A solution in which a red oil-dissolving pigment was dissolved in oleic acid was used.
<Test method>
The test method was the same as the diamond paste method. Grade 3 or higher was accepted.

Oleic acid residual rate <Test method>
In the same manner as in the above red oleic acid antifouling test, the soil solution is attached to remove excess soil solution, and after standing for a certain period of time, the 103 method (JIS L 1042) is used for washing and no detergent is used. A cloth for washing was prepared.
Residual oleic acid was extracted with chloroform from the fabric washed with red oleic acid.
Oleic acid residual rate (%)
= Residual oleic acid / dropped oleic acid (0.1 ml) x 100

[Comparative Example 1]
The same treatment was performed using the same fabric as in Example 1 except that the treatment liquid having the formulation shown below was used.
<Anti-wrinkle agent treatment liquid formulation>
Ingredient Mixing Ratio Becamine LF-55P Conch (Dainippon Ink Chemical Co., Ltd.) 15% by mass
Catalyst GT-3 (Dainippon Ink Chemical Co., Ltd.) 3% by mass
Nikka Silicon AMC800E (Nikka Chemical Co., Ltd.) 3% by mass
Silicone Quran Si810-50M (manufactured by one company) 3% by mass

[Comparative Example 2]
The same treatment was performed using the same fabric as in Example 1 except that the treatment liquid having the formulation shown below was used.
<Anti-wrinkle + water / oil repellent antifouling agent treatment liquid formulation>
Ingredient Mixing Ratio Becamine LF-55P Conch (Dainippon Ink Chemical Co., Ltd.) 15% by mass
Catalyst GT-3 (Dainippon Ink Chemical Co., Ltd.) 3% by mass
Asahi Guard AG950 (manufactured by Meisei Chemical Co., Ltd.) 9% by mass

[Comparative Example 3]
The same treatment was performed using the same fabric as in Example 1 except that the treatment liquid having the formulation shown below was used.
<Anti-wrinkle + water-absorbing and oil-absorbing antifouling agent treatment liquid formulation>
Ingredient Mixing Ratio Becamine LF-55P Conch (Dainippon Ink Chemical Co., Ltd.) 15% by mass
Catalyst GT-3 (Dainippon Ink Chemical Co., Ltd.) 3% by mass
Polon SR Conch II (Shin-Etsu Chemical Co., Ltd.) 0.5% by mass
Evaphenol N-7 (Nikka Chemical Co., Ltd.) 2% by mass

  The processed fabrics obtained in Comparative Examples 1 to 3 were evaluated in the same manner as in Example 1. The results are shown in Tables 1 and 2. Moreover, the oleic acid residual rate was shown in FIG.

[Example 2]
100% broad cotton (Vertical 50 × Width 40 × Vertical 148 × Horizontal 70) raw machine with paste, scouring, bleaching, mercerized fabric processed by conventional methods, then the following formula (1) It was immersed in a processing solution containing a fixing agent, pad-treated at a pick-up rate of 70%, and dried at 120 ° C. for 1 minute.
Furthermore, it is immersed in a hydrophilic oil repellent and antifouling agent treatment solution of the following formula (2), subjected to pad treatment at a pick-up rate of 70%, dried at 120 ° C. for 1 minute, and further cured at 160 ° C. for 2 minutes. The liquid was allowed to adhere to the dough.

(1) <Fisk processing agent treatment liquid formulation>
Ingredients Mixing ratio Dunfix 5000 (Nittobo) 2% by mass
(2) <Anti-wrinkle + hydrophilic oil repellent antifouling agent treatment liquid formulation>
Ingredients Mixing ratio Pararesin NC-3 (Ohara Paradium Chemical Co., Ltd.) 5% by mass
Becamine LF-55P Conch (Dainippon Ink Chemical Co., Ltd.) 15% by mass
Catalyst GT-3 (Dainippon Ink Chemical Co., Ltd.) 3% by mass
Softex N-491 (Kitahiro Chemical Co., Ltd.) 1% by mass

[Comparative Example 4]
100% broad cotton (Vertical 50 × Horizontal 40 × Vertical 148 × Horizontal 70) It was immersed in a processing solution containing a fixing agent, pad-treated at a pick-up rate of 70%, and dried at 120 ° C. for 1 minute.
Further, it was immersed in a hydrophilic oil repellent and antifouling agent treatment solution having the same formulation (2) as in Example 2, padded at a pickup rate of 70%, dried at 120 ° C. for 1 minute, and further at 160 ° C. for 2 minutes. It was cured to allow the treatment liquid to adhere to the dough.
(3) <Fisk processing agent treatment liquid formulation>
Ingredients Mixing ratio Dunfix RE (Nittobo) 2% by mass

  The processed fabrics obtained in Example 2 and Comparative Example 4 were evaluated in the same manner as in Example 1. The results are shown in Table 3.

It is a graph which shows the oleic acid residual rate after washing.

Claims (6)

  A treatment comprising a hydrophilic oil-repellent finishing agent comprising a copolymer of a fluorine-based vinyl monomer, a polyalkylene glycol-containing hydrophilic vinyl monomer and a non-polyalkylene glycol-based vinyl monomer, and a softening agent comprising a nonionic surfactant aqueous solution. A fiber structure, which is subjected to heat treatment after the liquid is applied to the fiber structure.   The fiber structure according to claim 1, wherein an antifouling agent comprising hydrophilic polyester is added to the treatment liquid.   3. The fiber structure according to claim 1, wherein a fixing agent containing diallylamine hydrochloride / sulfur dioxide copolymer is used for the reaction dyed fiber structure.   The fiber structure according to any one of claims 1, 2, and 3, which prevents sebum stain components from remaining in a laundry without using a detergent and prevents yellowing of clothes.   The fiber structure according to claim 1, 2, 3, or 4, wherein the water absorption (dripping method) JIS L 1096 is within 60 seconds. Treatment comprising a fluorine-based vinyl monomer, a polyalkylene glycol-containing hydrophilic vinyl monomer, a hydrophilic oil-repellent processing agent comprising a copolymer of a non-polyalkylene glycol-based vinyl monomer, and a softening agent comprising a nonionic surfactant aqueous solution. An antifouling processing method for a fiber structure, which comprises heat-treating the liquid structure after applying the liquid.

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