JP2011111682A - Method for producing weight-reduced polyamide-based fabric and weight-reduced polyamide-based fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a weight-reduced polyamide-based fabric, by which the polyamide-based fabric can causticly be reduced by a simple means in a state holding a proper strength responding to a use, and to provide a weight-reduced polyamide-based fabric which is obtained by the production method, expresses high drape and soft hand, and has functions such as a lightened weight imparted thereto. <P>SOLUTION: The method for producing the caustic reduced polyamide-based fabric is characterized by including a process for causticly reducing the polyamide-based fabric with a treating solution containing a caustic reduction agent (A) which is a compound whose 1 wt.% aqueous solution has a pH (20°C) of ≥2 and <7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing a weight-reduced polyamide fabric and a weight-reduced polyamide fabric. More specifically, the production of a weight-reduced polyamide-based fabric that can exhibit a high degree of drape and a soft texture and impart weight reduction performance by fibrillating a part of the polyamide-based fabric and reducing the weight. The present invention relates to a method and a weight-reduced polyamide-based fabric.

Polyamide compounds include 6-nylon, 6,6-nylon, 11-nylon, 12-nylon, polymetaxylene azimamide, polyparaxylylene decanamide, polybiscyclohexylmethane decanamide, and co-polymers containing them as components. Polyamide and the like can be mentioned, but 6-nylon and 6,6-nylon are often used particularly for clothing.
Polyamide-based fabrics containing these polyamide-based compounds are sportswear, stockings, tights, innerwear such as underwear, and clothing materials such as outerwear such as jackets, pants, and suits; automotive applications such as airbags and seat belts. It is widely used for industrial materials for fishing such as fishing lines and fish nets; general household materials for interiors such as carpets and curtains; and sanitary materials such as bandages, gauze and masks.
In addition, studies have been made to add value to these polyamide-based fabrics. For example, texture modification and weight reduction can be mentioned, but the polyamide fiber itself has a flexible drape, and weight reduction processing for imparting these performances has not received much attention. For this reason, there has never been an appropriate weight loss processing method or a method for manufacturing a weight-reduced polyamide-based fabric capable of imparting functions such as high drape and specific texture and weight reduction.

  For example, in Patent Document 1, a composite fiber composed of a polyamide polymer that is easily soluble in a solvent and a polyamide polymer that is hardly soluble is used, and the easily soluble polyamide polymer is disposed so as to be exposed at least on a part of the fiber surface. In addition, it is disclosed to reduce the amount of a readily soluble polyamide polymer by 20 to 100% by weight with a solvent such as water.

However, in the method disclosed in Patent Document 1, in order to reduce the target fiber, it is essential that the fiber is a composite fiber made of a readily soluble and hardly soluble polyamide polymer. Therefore, in the case of a general-purpose polyamide fiber that does not contain a readily soluble polyamide polymer, it is difficult to reduce the amount. Moreover, since the weight loss rate is as high as 20 to 100% by weight, sufficient fabric strength cannot be maintained, and a part having a different texture is generated, and the wear resistance is partially weakened.
In addition, since it is necessary to dispose the readily soluble polyamide polymer so as to be exposed on a part of the fiber surface, the structure of the spinneret becomes complicated, and there is a concern that the composite cross section may collapse. As a result, when performing weight loss processing, the weight loss becomes uneven, and the fabric strength is locally weakened. Further, in order to use such a complex spinneret, advanced technology and production equipment are required, and it is difficult to reduce the weight with a general-purpose polyamide fiber, leading to an increase in cost.

JP 2000-154429 A

  An object of the present invention is to provide a method for producing a weight-reduced polyamide-based fabric that can be subjected to a weight-reducing process by a simple means while maintaining an appropriate strength according to the use of the polyamide-based fabric. There is. Another object of the present invention is to provide a weight-reduced polyamide-based fabric that is obtained by the manufacturing method, exhibits a high level of drape and a soft texture, and is provided with functions such as weight reduction.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors use a weight-reducing agent (A), which is a compound in which the pH (20 ° C.) of a 1% aqueous solution is 2 or more and less than 7, when a polyamide-based fabric is used. On the other hand, it is possible to uniformly reduce the weight with simple means while maintaining the appropriate strength according to the application, and to express advanced drape and flexible texture, and to provide functions such as weight reduction. I found.

  That is, the present invention includes a step of weight-reducing the polyamide-based fabric using a treatment liquid containing the weight-reducing processing agent (A), and the weight-reducing processing agent (A) has a pH (20 ° C.) of 2% of 1% aqueous solution. This is a method for producing a weight-reduced polyamide-based fabric which is a compound having a value of less than 7.

  The weight loss processing agent (A) is at least selected from carboxylic acids having 10 or less carbon atoms, phosphorus atom-containing oxoacids, phosphorus atom-containing oxoacid salts, boron atom-containing oxoacids and sulfur atom-containing oxoacid salts. It is preferably one type, and more preferably contains a sulfur atom-containing oxoacid salt.

  Moreover, it is preferable that the said process liquid further contains the weight reduction process promoter (B) which consists of at least 1 sort (s) of nonionic surfactant. The nonionic surfactant preferably has an HLB of 10 to 20 and a weight average molecular weight of 800 or more. The nonionic surfactant further preferably has at least one aromatic ring in the molecule.

  The weight ratio (B / A) of the weight loss processing accelerator (B) to the weight loss processing agent (A) is preferably 0.5 to 5.0. Moreover, in the said process, it is preferable that the temperature when carrying out a weight reduction process of a polyamide-type fabric is 100-140 degreeC.

  The weight-reduced polyamide fabric obtained by the production method of the present invention has a strength per unit denier of the fabric of 0.03 to 0.50 N / d.

  With the method for producing a weight-reduced polyamide fabric according to the present invention, the weight-reduction processing can be easily and economically carried out with respect to the polyamide-based fabric while maintaining an appropriate strength according to each application such as clothing. Can do. As a result, it is possible to obtain a weight-reduced polyamide-based fabric that exhibits a high level of drape and a soft texture, and is provided with performance such as weight reduction.

  The present invention includes a process of weight-reducing a polyamide-based fabric using a treatment liquid containing a weight-reducing processing agent (A), and the weight-reducing processing agent (A) has a pH (20 ° C.) of a 1% aqueous solution of 2 or more and 7 This is a method for producing a weight-reduced polyamide-based fabric, which is a compound of less than Details will be described below.

[Polyamide fabric]
The polyamide-based fabric used in the production method of the present invention refers to a woven fabric, knitted fabric, nonwoven fabric, felt, artificial leather, etc. containing a polyamide-based compound. Synthetic fibers, recycled fibers or natural fibers other than polyamide-based fabrics, half fibers Synthetic fibers, inorganic fibers, and the like may be mixed, mixed, or interwoven. For example, a fabric using a blended yarn of a fiber containing a polyamide-based compound such as 6-nylon and 6,6-nylon and natural fibers such as cotton, wool, rayon, acetate, regenerated fibers, and semi-synthetic fibers, 6- Any one of fabric, warp or weft using a mixed yarn of a fiber containing a polyamide compound such as nylon or 6,6-nylon and a synthetic fiber such as urethane, 6-nylon, 6,6-nylon Examples thereof include fibers containing a polyamide-based compound such as the above, and the remaining fabrics such as natural fibers such as cotton, wool, rayon, acetate, and polyester, recycled fibers, semi-synthetic fibers, and synthetic fibers. The polyamide-based fabric used in the production method of the present invention includes a fiber structure in which the above-mentioned polyamide-based fabric and other synthetic fibers are laminated, and a fabric layer laminate.
Moreover, in this invention, in order to improve drape property, the fabric raw material using an ultrafine fiber can be used conveniently. The ultrafine fiber refers to a fiber having a single fiber fineness of 1 dtex or less. Further, when used for apparel applications, in order to maintain the fabric strength, there are cases in which a fabric using a polyamide compound as a warp and a polyester fiber as a weft is used. Incidentally, the weight-reduced polyamide-based fabric obtained by the production method of the present invention may be referred to as “polyamide-based weight-reduced fabric”.

  As the polyamide-based compound, 6-nylon, 6,6-nylon, 11-nylon, 12-nylon, polymetaxylene azimamide, polyparaxylylene decanamide, polybiscyclohexylmethane decanamide, and the main components thereof. Examples include copolyamide. When used for clothing, 6-nylon, 6,6-nylon, 11-nylon and 12-nylon are preferred, and 6-nylon and 6,6-nylon are more preferred.

The polyamide compound contained in the polyamide fabric of the present application is insoluble in water; alcohols such as methanol and ethanol; ketones such as acetone and methyl ethyl ketone; and aromatic solvents such as benzene, xylene and naphthalene. .
The reason for showing solvent resistance is that the main chain skeleton has a structure in which an amide group and a hydrocarbon group are connected in a linear fashion, and the side chain has improved solubility in a solvent. It does not contain a substituent such as an alkoxy group. That is, the polyamide-based fabric according to the present invention can use a general-purpose polyamide-based compound that does not contain a substituent in the side chain, and can be used in a simple and economical weight reduction process, which is not possible with the prior art. Can exhibit a gentle texture and a high level of drape.

[Weight loss processing agent (A)]
The weight loss processing agent (A) of the present invention is not particularly limited as long as the pH (20 ° C.) of the 1 wt% aqueous solution is 2 or more and less than 7. That is, the weight loss processing agent (A) of the present invention refers to a compound, and is not particularly limited as long as the pH (20 ° C.) of a 1% by weight aqueous solution of the compound is in the range of 2 or more and less than 7. By using such a compound, it is possible to uniformly reduce the weight of the polyamide-based fabric while maintaining an appropriate strength for each application, and to reduce the weight easily and economically. it can.

On the other hand, a strong acid having a pH of less than 2 in a 1% by weight aqueous solution is not practical because it exhibits excessive weight loss and is accompanied by a significant decrease in fabric strength and damages the dyeing machine. Examples include hydrochloric acid, nitric acid, sulfuric acid and the like.
In addition, a compound having a 1% by weight aqueous solution having a pH of 7 or more has almost no effect in weight loss. Examples include potassium bromide, sodium chloride, sodium sulfate, sodium acetate, guanidine sulfamate, magnesium acetate, sodium hydroxide and the like.

  Examples of the weight loss processing agent (A) of the present invention include lactic acid, formic acid, acetic acid, chloroacetic acid, bromoacetic acid, succinic acid, citric acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargon Carboxylic acids such as acid, capric acid, oleic acid, stearic acid; phosphoric acid, phosphorous acid, phosphonic acid, phosphonous acid, phosphinic acid, phosphinic acid, phosphenic acid, phosphinic acid, diphosphoric acid, triphosphoric acid Phosphoric acid, isophosphoric acid, pyrophosphoric acid, hypophosphoric acid, polymerized phosphoric acid, phosphorous atom-containing oxo acids such as polyalkylene oxide adducts; boric acid, perboric acid, hypoboric acid, boronic acid, Boronic acid, metaboric acid, tetraboric acid and other oxo acids containing boron atoms; selenic acid, selenious acid, selenoxylic acid, diselenic acid, diselenous acid, telluric acid, nitroxyl , Azonic acid, azonic acid, arsenic acid, arsenous acid, arsonic acid, arsonous acid, arsic acid, arsinous acid, arsenic acid, arsenous acid, stibonic acid, stibonic acid, stibic acid, stibnic acid, chloro Carbonic acid, carbonochloric acid, trithiocarbonic acid, carbonotrithioic acid, cyanic acid, thiocyanic acid, selenocyanic acid, telluric acid, isocyanic acid, isothiocyanic acid, isoselenocyanic acid, isosteric acid, thunderic acid, silicic acid, chromic acid, Dichromic acid, manganic acid, permanganic acid, technetic acid, pertechnetic acid, rhenic acid, perrhenic acid, chloric acid, perchloric acid, chlorous acid, hypochlorous acid, bromic acid, perbromic acid, bromine Acids, acids such as hypobromous acid; salts of these acids (including carboxylic acids, phosphorous atom-containing oxoacids, boron atom-containing oxoacids), Salts in which the pH (20 ° C.) of the weight% aqueous solution is 2 or more and less than 7; hypofluorite, iodate, iodate, hypoiodite, periodate, nitrite, hyponitrite Salts such as hyponitrite; sulfuric acid, disulfuric acid, thiosulfuric acid, sulfamic acid, benzenesulfonic acid, chlorosulfonic acid, sulfamic acid, sulfurous acid, disulfurous acid, thiosulfuric acid, sulfoxylic acid, dithionic acid, dithionic acid, trithionic acid, And salts of oxo acids containing sulfur atoms such as tetrathionic acid, pentathionic acid, peroxomonosulfuric acid, peroxodisulfuric acid, and the like. The weight loss processing agent (A) may be used alone or in combination of two or more.

The counter ions constituting these acid salts are not particularly limited as long as they are stable at room temperature as inorganic salts. Alkali metals such as lithium, sodium, potassium, rubidium, cesium, or beryllium, magnesium, calcium, strontium, barium And alkaline earth metals such as aluminum, ammonium and triethanolamine.
Among these, the counter ion constituting the phosphorus atom-containing oxoacid salt and the sulfur atom-containing oxoacid salt is preferably sodium, potassium, magnesium, calcium, aluminum, ammonium, triethanolamine, sodium, potassium, ammonium, More preferred is triethanolamine.

  Examples of salts of these acids include polymerized sodium phosphate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, ammonium sulfate, sodium bisulfite, hydrosulfate soda, ammonium sulfamate, sodium hydrogen sulfite, Examples include aluminum ammonium sulfate, sodium thiosulfate, ammonium persulfate, magnesium oleate, and magnesium stearate.

  Among these, as the weight loss processing agent (A), since it is possible to maintain an appropriate fabric strength according to each use, a carboxylic acid having 10 or less carbon atoms, a phosphorus atom-containing oxoacid, a phosphorus atom-containing oxoacid salt, At least one selected from oxoacids containing boron atoms and oxoacid salts containing sulfur atoms is preferred. Further, the weight loss processing agent (A) is preferably at least one selected from carboxylic acids having 10 or less carbon atoms, phosphorus atom-containing oxoacids, phosphorus atom-containing oxoacid salts and sulfur atom-containing oxoacid salts, At least one selected from carboxylic acids having 10 or less carbon atoms, phosphorus atom-containing oxoacid salts and sulfur atom-containing oxoacid salts is particularly preferred, and sulfur atom-containing oxoacid salts are most preferred.

  Examples of the carboxylic acid having 10 or less carbon atoms include monocarboxylic acids such as fatty acids and hydroxy fatty acids having 10 or less carbon atoms, and dicarboxylic acids. Examples of carboxylic acids having 10 or less carbon atoms include formic acid, acetic acid, lactic acid, succinic acid, citric acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid and the like. . Among these, formic acid, acetic acid, lactic acid, succinic acid, citric acid, propionic acid, butyric acid, valeric acid, and caproic acid are preferable, formic acid, acetic acid, lactic acid, succinic acid, and citric acid are more preferable, and formic acid and acetic acid are more preferable. .

  Examples of the phosphorus atom-containing oxo acid include those described above. Among these, phosphoric acid, hypophosphorous acid, phosphorous acid, phosphonic acid and phosphinic acid are preferable, phosphoric acid, hypophosphorous acid and phosphorous acid are more preferable, and phosphoric acid and phosphorous acid are particularly preferable.

  Examples of the phosphorus atom-containing oxoacid salts include those described above. Among them, polymerized sodium phosphate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate and the like can be mentioned. Among these, polymerized sodium phosphate, ammonium dihydrogen phosphate, and potassium dihydrogen phosphate are preferable, and polymerized sodium phosphate and ammonium dihydrogen phosphate are more preferable.

  Examples of the oxo acid containing a boron atom include those described above. Among these, boric acid, perboric acid, boronic acid, and borinic acid are preferable, and boric acid and perboric acid are more preferable.

  Examples of the sulfur atom-containing oxoacid salt include those described above. Among them, sulfuric acid, disulfuric acid, thiosulfuric acid, sulfamic acid, benzenesulfonic acid, chlorosulfonic acid, sulfamic acid, sulfurous acid, disulfurous acid, thiosulfuric acid, sulfoxylic acid, dithionic acid, dithionic acid, trithionic acid, tetrathionic acid, A salt of pentathionic acid is preferable, and a salt of sulfuric acid, sulfurous acid, dithionic acid, and dithionic acid is more preferable.

  Examples of sulfur atom-containing oxoacid salts include ammonium sulfate, sodium bisulfite, hydrosulfate soda, ammonium sulfamate, sodium hydrogen sulfite, aluminum ammonium sulfate, sodium thiosulfate, and ammonium persulfate. Among these, ammonium sulfate, sodium bisulfite, hydrosulfate soda, ammonium sulfamate, sodium hydrogen sulfite, aluminum ammonium sulfate, sodium thiosulfate, and ammonium persulfate are preferable, and ammonium sulfate, sodium bisulfite, hydrosulfate soda, and aluminum ammonium sulfate are more preferable.

[Weight loss processing accelerator (B)]
The treatment liquid containing the weight loss processing agent (A) of the present invention preferably further contains a weight reduction processing accelerator (B) made of at least one nonionic surfactant. The weight loss processing accelerator (B) is not particularly limited as long as it is a nonionic surfactant, and one or more kinds may be used. By further including the weight loss processing accelerator (B) of the present invention in addition to the weight loss processing agent (A) of the present invention, the weight loss processing agent (A) is uniformly permeated into the polyamide-based fabric, thereby making the fabric more uniform. Weight loss can be obtained. Further, while maintaining an appropriate strength, functions such as uniform texture modification and weight reduction can be imparted to the polyamide-based fabric.

  Examples of the nonionic surfactant that is the weight loss processing accelerator (B) of the present invention include polyoxyethylene hexyl ether, polyoxyethylene octyl ether, polyoxyethylene decyl ether, polyoxyethylene lauryl ether, polyoxyethylene poly Polyoxyalkylene linear alkyl ethers such as oxypropylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene polyoxypropylene oleyl ether; polyoxyethylene 2-ethylhexyl ether, polyoxyethylene isocetyl ether, Polyoxyalkylene branched primary alkyl ethers such as polyoxyethylene isostearyl ether; polyoxyethylene 1-hexyl hexyl ether; Polyoxyalkylene branched secondary alkyl ethers such as reoxyethylene 1-octyl hexyl ether, polyoxyethylene 1-hexyl octyl ether, polyoxyethylene 1-pentyl heptyl ether, polyoxyethylene 1-heptyl pentyl ether; Polyoxyalkylene alkenyl ethers such as oxyethylene oleyl ether; polyoxyalkylene alkyl phenyl ethers such as polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene lauryl phenyl ether; polyoxyethylene tristyryl phenyl ether, poly Oxyethylene distyryl phenyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene tribenzyl Polyoxyalkylene alkylaryl phenyl ethers such as phenyl ether, polyoxyethylene dibenzyl phenyl ether, polyoxyethylene benzyl phenyl ether; polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene monostearate, polyoxyethylene Polyoxyalkylene fatty acid esters such as monomyristylate, polyoxyethylene dilaurate, polyoxyethylene diolate, polyoxyethylene dimyristate, polyoxyethylene distearate; polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan Polyoxyalkylene solvents such as monooleate, polyoxyethylene sorbitan laurate, polyoxyethylene sorbitan octylate Polyoxyalkylene sorbitol fatty acid ester; polyoxyalkylene castor oil ether such as polyoxyethylene castor oil ether; polyoxyalkylene hydrogenated castor oil ether such as polyoxyethylene hydrogenated castor oil ether; polyoxyethylene lauryl amino ether; Polyoxyalkylene alkyl amino ether such as polyoxyethylene stearyl amino ether; oxyethylene-oxypropylene block or random copolymer; terminal alkyl etherified product of oxyethylene-oxypropylene block or random copolymer; oxyethylene-oxypropylene block Or the terminal sucrose etherified substance of a random copolymer etc. can be mentioned.

  Among these nonionic surfactants, the polyoxyalkylene linear alkyl ether and the polyoxyalkylene branched chain described above are used for improving the wettability of the weight reducing agent (A) to the fabric surface and the permeability to the fabric structure. Primary alkyl ether, polyoxyalkylene branched secondary alkyl ether, polyoxyalkylene alkenyl ether, polyoxyalkylene alkylphenyl ether, polyoxyalkylene alkylaryl phenyl ether, polyoxyalkylene fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, poly Oxyalkylene sorbitol fatty acid ester, polyoxyalkylene castor oil ether, polyoxyalkylene hydrogenated castor oil ether, polyoxyalkylene alkylamino ether, oxy Nonionic interfaces such as tylene-oxypropylene block or random copolymer, terminal alkyl etherified product of oxyethylene-oxypropylene block or random copolymer, terminal sucrose etherified product of oxyethylene-oxypropylene block or random copolymer An activator is preferred.

  The weight loss processing accelerator (B) of the present invention can further improve the wettability of the weight loss processing agent (A) to the fabric surface and the permeability to the fabric structure, and can promote the weight loss efficiently. A nonionic surfactant having an HLB of 10 or more and 20 or less and a weight average molecular weight of 800 or more is preferred. As HLB, 10-20 are preferred, 11-19.5 are more preferred, and 12-19 are still more preferred. When the HLB is less than 10, the solubility in a solvent such as water is deteriorated, and the HLB may not contribute to improving the permeability of the weight loss processing agent (A). Moreover, as a weight average molecular weight, 800-15000 are preferable, 1300-12000 are more preferable, and 1800-8000 are more preferable. If the weight average molecular weight of the weight loss processing accelerator (B) is less than 800, the weight loss processing agent (A) may have poor penetrability into the fabric, resulting in uneven weight loss. Moreover, when a weight average molecular weight is more than 15000, the solubility to solvents, such as water, worsens, and it may not contribute to the permeability improvement of a weight loss processing agent (A). These nonionic activators used as the weight loss processing accelerator (B) may contain one or more kinds.

  Examples of nonionic surfactants having an HLB by Griffin method of 10 or more and 20 or less and a weight average molecular weight of 800 or more include polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene fatty acid esters, polyoxy Alkylene sorbitan fatty acid ester, polyoxyalkylene sorbitol fatty acid ester, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene alkyl aryl phenyl ether, polyoxyalkylene castor oil ether, polyoxyalkylene hydrogenated castor oil ether, polyoxyalkylene alkyl amino ether, oxy Ethylene-oxypropylene block or random copolymer, oxyethylene-oxypropylene block or lander Terminal alkyl ethers of copolymers, oxyethylene - terminus sucrose etherified like oxypropylene block or random copolymer.

5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene alkyl ether, 10-90 are more preferable, and 15-80 are more preferable. Moreover, 5-30 are preferable, as for carbon number of an alkyl group, 7-25 are more preferable, and 10-20 are more preferable.
5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene alkenyl ether, 10-90 are more preferable, and 15-80 are more preferable. Moreover, 5-30 are preferable, as for carbon number of an alkyl group, 7-25 are more preferable, and 10-20 are more preferable.

5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene fatty acid ester, 10-90 are more preferable, and 15-80 are more preferable. Moreover, 5-30 are preferable, as for carbon number of an alkyl group, 7-25 are more preferable, and 10-20 are more preferable.
5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene sorbitan fatty acid ester, 10-90 are more preferable, and 15-80 are more preferable. Moreover, 5-30 are preferable, as for carbon number of an alkyl group, 7-25 are more preferable, and 10-20 are more preferable.
5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene sorbitol fatty acid ester, 10-90 are more preferable, and 15-80 are more preferable. Moreover, 5-30 are preferable, as for carbon number of an alkyl group, 7-25 are more preferable, and 10-20 are more preferable.

5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene alkylphenyl ether, 10-90 are more preferable, and 15-80 are more preferable. Moreover, 5-30 are preferable, as for carbon number of an alkyl group, 7-25 are more preferable, and 10-20 are more preferable.
5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene alkyl aryl phenyl ether, 10-90 are more preferable, and 15-80 are more preferable. The alkylaryl group is preferably a tristyrylphenyl group, a distyrylphenyl group, a styrylphenyl group, a tribenzylphenyl group, a dibenzylphenyl group or a benzylphenyl group, a distyrylphenyl group, a styrylphenyl group, a dibenzylphenyl group, A benzylphenyl group is more preferable, and a tristyrylphenyl group and a distyrylphenyl group are more preferable.

20-300 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene castor oil ether, 30-250 are more preferable, and 40-200 are further more preferable.
20-300 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene hydrogenated castor oil ether, 30-250 are more preferable, and 40-200 are further more preferable. 5-100 are preferable, as for the addition mole number of the alkylene oxide of polyoxyalkylene alkylamino ether, 10-90 are more preferable, and 15-80 are more preferable. Moreover, 5-30 are preferable, as for carbon number of an alkyl group, 7-25 are more preferable, and 10-20 are more preferable.

The number of moles of alkylene oxide in the oxyethylene-oxypropylene block or random copolymer is preferably 20 to 100, more preferably 30 to 90, and still more preferably 40 to 80.
The number of moles of alkylene oxide of the terminal alkyl etherified product of the oxyethylene-oxypropylene block or random copolymer and the terminal sucrose etherified product of the oxyethylene-oxypropylene block or random copolymer is preferably 20 to 100, preferably 30 to 90 is more preferable, and 40 to 80 is more preferable.

  Among these, as the weight loss processing accelerator (B), a nonionic surfactant having at least one aromatic ring in the molecule is preferable because it exhibits good weight loss. Examples include the aforementioned polyoxyalkylene alkyl phenyl ether and polyoxyalkylene alkyl aryl phenyl ether.

  In the treatment liquid containing the weight loss processing agent (A) and the weight loss processing accelerator (B), the weight ratio (B / A) of the weight loss processing accelerator (B) to the weight loss processing agent (A) is 0.5-5. 0.0 is preferable, 0.7 to 4.0 is more preferable, and 1.0 to 3.0 is more preferable. When B / A is less than 0.5, the effect as a weight loss processing accelerator is small, and the weight loss effect of the weight loss processing agent (A) may not be maximized. On the other hand, when B / A exceeds 5.0, the amount of the weight reduction processing accelerator (B) has reached the upper limit, so not only can the effect of promoting weight loss be expected even when the amount is increased, but also the fabric due to foaming. May float on the liquid surface and the weight loss may become uneven.

[Treatment solution]
The treatment liquid of the present invention is obtained by dissolving the weight loss processing agent (A) or the weight loss processing accelerator (B) in a solvent such as water, alcohols or ketones. In consideration of safety, cost, and environmental impact, it is preferable to use water as the main solvent. The water used in the present invention may be any of pure water, distilled water, purified water, soft water, ion exchange water, tap water and the like.

  The weight ratio of the weight reducing agent (A) to the entire treatment liquid is preferably 0.05 to 0.30% by weight, more preferably 0.08 to 0.20% by weight, and 0.10 to 0.15% by weight. Further preferred. When the weight ratio of the weight loss processing agent (A) is less than 0.05% by weight, good weight loss is not obtained, and the desired texture may not be obtained. On the other hand, when the weight ratio of the weight loss processing agent (A) is larger than 0.30% by weight, the weight loss property is remarkably advanced, and the fabric strength may be weakened.

  The weight ratio of the weight loss processing accelerator (B) to the entire treatment liquid is preferably 0.05 to 0.50% by weight, more preferably 0.10 to 0.40% by weight, and 0.12 to 0.30% by weight. Is most preferred. When the weight ratio of the weight loss processing accelerator (B) is less than 0.05% by weight, the effect of the weight loss processing agent (A) may not be maximized. When the weight ratio of the weight loss processing accelerator (B) is larger than 0.50% by weight, the amount of the weight loss processing accelerator (B) has reached the upper limit. In addition to being unable to do so, the fabric may float on the liquid surface due to foaming and the weight loss may become uneven.

  The treatment liquid of the present invention may contain other components in addition to the aforementioned weight loss processing agent (A) and weight loss processing accelerator (B) as long as the effects of the present invention are not impaired. Examples of other components include scouring agents, dyes, dye dispersants, chelating agents and the like used in each step other than the weight loss processing step of the present invention.

  A method for preparing the treatment liquid is not particularly limited, and a known method can be employed. For example, a solvent such as water is introduced into a processing apparatus such as a liquid dyeing machine, and a fabric to be processed is inserted. Further, the pump is operated while the solvent is kept at a low temperature, that is, in a state where the weight reduction process does not proceed substantially, and the solvent is circulated in the apparatus. In this state, the weight reduction processing agent (A) and the weight reduction processing accelerator (B) are charged into the solvent, or the weight reduction processing agent (A) and the weight reduction processing accelerator (B) are temporarily dissolved in the solvent. throw into. This facilitates dilution of the treatment bath within the apparatus, thus eliminating local non-uniformities in the treatment bath concentration.

[Method for producing weight-reduced polyamide fabric]
The method for producing a weight-reduced polyamide fabric according to the present invention essentially includes a step of weight-reducing the polyamide-based fabric using a treatment liquid containing a weight-reducing agent (A) (sometimes referred to as a weight-reduction processing step). . In general, the processing step of the polyamide-based fabric includes a scouring step, a dyeing step, and a post-processing step, and is performed in this order. In the production method of the present invention, the weight reduction processing step may be introduced between any steps, or may be performed simultaneously with each step. About a scouring process, a dyeing process, and a post-processing process, there is no limitation in particular and a publicly known method is employable.

Specifically, in the weight reduction processing step of the present invention, the polyamide fabric is immersed in the processing liquid as described in the method for preparing the processing liquid, and the liquid flow of the processing apparatus is circulated at 100 to 140 ° C. Thus, weight loss processing is performed using the physical stagnation effect of the fabric. Next, the fabric is thoroughly washed with water so that no processing agent remains on the fabric, and then dried. Drying is generally heat treatment using a pin tenter or the like so that the solvent component can be removed.
Further, the polyamide fabric is immersed in a bath containing the weight loss processing agent (A) (or the processing fluid containing the weight reduction processing agent (A) is sprayed onto the polyamide fabric by spraying or the like), and the weight reduction processing agent at room temperature. It can also carry out in accordance with conventional methods, such as a roll batch method, a pad-steam method, a spray-steam method, a batch type suspension kneading method, by giving the processing liquid containing (A).

  In the weight reduction processing step of the present invention, a liquid dyeing machine, a Wins dyeing machine, a jigger dyeing machine, a beam dyeing machine or the like is usually used. Moreover, it can be used also about a cheese dyeing machine, a skein dyeing machine, a package type dyeing machine, etc. at the point which can heat and pressurize. Moreover, continuous processing using a continuous dyeing machine or the like can also be performed. Processing conditions such as processing temperature, processing time, mechanical conditions of the weight reduction processing step are determined according to the polyamide fabric, the weight reduction processing agent (A), the weight reduction processing accelerator (B), the concentration of these components in the processing liquid, etc. It can be set appropriately. Here, the mechanical conditions are conditions for expressing the physical stagnation effect between the fabrics to be processed, or the physical stagnation effect due to the sliding between the fabric and the dyeing machine, such as pump flow rate, bath ratio, etc. Can be varied.

In the weight reduction processing step of the present invention, the temperature when the polyamide-based fabric is weight-reduced using the treatment liquid (sometimes referred to as weight reduction processing temperature) is preferably 100 ° C to 140 ° C, more preferably 105 ° C to 130 ° C. 110 ° C to 120 ° C is most preferable. When the weight reduction processing temperature is lower than 100 ° C., the weight reduction performance is poor, and the weight reduction processing time is long, which may lead to an increase in cost. On the other hand, when the weight loss processing temperature is higher than 140 ° C., the weight loss property is remarkably advanced, and the fabric strength may be weakened. Moreover, there is a concern about yellowing of the fabric.
In the weight reduction processing step of the present invention, the time for weight reduction processing of the polyamide-based fabric using the treatment liquid (sometimes referred to as weight reduction processing time) is preferably 30 minutes to 240 minutes, more preferably 60 minutes to 180 minutes. 90 minutes to 120 minutes is most preferable. If the weight loss processing time is shorter than 30 minutes, good weight loss may not be obtained. On the other hand, when the weight reduction processing time is longer than 240 minutes, the productivity may deteriorate, leading to an increase in cost.

Moreover, when performing a weight reduction process simultaneously with a scouring process, since the weight loss processing agent (A) is acidic, it is suitable in the case of the scouring process which does not use an alkali.
Further, when the weight loss processing step is performed simultaneously with the dyeing step, the weight loss processing agent (A) is preferably a phosphate such as polymerized phosphoric acid or acetic acid. However, from the viewpoint of dyeability of the polyamide-based fabric, it is necessary to perform weight reduction processing under conditions such as appropriate pH and temperature suitable for the dye to be used.
Moreover, when performing post-processing and weight reduction processing simultaneously, it is suitable when the post-processing agent, the weight reduction processing agent (A), and the weight reduction processing accelerator (B) have good compatibility at the processing temperature. If the compatibility with the post-processing agent is poor, the weight-reducing processing agent (A) and the weight-reducing processing accelerator (B) do not function due to separation of the processing fluid or the occurrence of scum, and good weight-reducing properties are obtained. There is a fear that it is not possible. Moreover, a post-processing agent may not be provided appropriately.

  Examples of the method for producing a weight-reduced polyamide fabric according to the present invention include the following. First, a scouring process is performed for 1 hour at 100 ° C. under alkaline conditions using a liquid dyeing machine. Next, after pre-setting with a pin tenter, the scoured polyamide-based fabric is placed in a liquid flow dyeing machine to perform weight reduction processing. In the weight reduction processing, the weight reduction processing agent (A) and the weight reduction processing accelerator (B) are maintained with water kept at a low temperature, that is, in a state in which the weight reduction processing does not substantially proceed, and the pump is operated. Is put into water and then performed at 120 ° C. for 2 hours. Next, a dye or the like is added, dyeing is performed at 100 ° C. for 1 hour, and drying is performed with a pin tenter to obtain a polyamide-based weight loss processed fabric.

[Polyamide weight-loss processed fabric]
According to the production method of the present invention, it is possible to obtain a polyamide-based weight-reduced fabric that exhibits a high level of drape and a soft texture, and is provided with performance such as weight reduction. Specifically, the strength per unit denier is 0.03 to 0.50 N / d, preferably 0.05 to 0.30 N / d, more preferably 0.07 to 0.20 N / d, and further preferably. It is possible to obtain a polyamide-based weight-reduced fabric having an appropriate strength for each application, which is 0.08 to 0.16 N / d. In addition, the appropriate strength for each application in which the weight loss rate is 0.4 to 4.5% by weight, preferably 1.2 to 4.1% by weight, and more preferably 2.0 to 3.8% by weight. Can be obtained.

  In addition, according to the production method of the present invention, the fiber surface can be fibrillated, which exhibits high drape and a soft texture, and is suitable for imparting performance such as weight reduction. For example, when the surface of the fiber surface is observed with an electron microscope, at least one fibrillated damaged portion of 2 μm or more (preferably 5 to 25 μm, more preferably 10 to 20 μm) is obtained in a 100 μm square region (preferably Can be observed at 5 to 40 sites, more preferably 10 to 30 sites).

  The polyamide-based weight loss processed fabric obtained by the production method of the present invention includes sportswear, stockings, tights, innerwear such as underwear, and clothing materials such as outerwear such as jackets, pants, and suits; air bags and sheets It is widely used for automobiles such as belts, industrial materials for fishing such as fishing lines and fish nets; general household materials such as carpets and curtains; sanitary materials such as bandages, gauze and masks.

  The present invention is described in detail in the following examples and comparative examples, but the present invention is not limited thereto. In the examples, “parts” and “%” represent “parts by weight” and “% by weight”, respectively.

〔Evaluation methods〕
(Weight loss rate)
Next, the weight loss rate was calculated by the formula.
Weight loss rate (% by weight): [{(cloth weight before weight reduction processing) − (weight of fabric after weight reduction processing)} / (cloth weight before weight reduction processing)] × 100
(Tear strength)
The tear strength (N / d) of the fabric was measured at n = 5 using an Elmendorf tear strength tester DY-6400 (manufactured by Daiei Kagaku Seisakusho Co., Ltd.), and the average value was calculated. .
(Texture)
Ten skilled technicians held the weight-reduced fabric in their hands and confirmed by sensory evaluation by handling. Moreover, the judgment showed the thing of the stage evaluated most.
◎ ……… The feeling of centering is very good compared to the unprocessed fabric.
○ ……… The feeling of centering is superior compared to unprocessed cloth.
Δ: The feeling of centering is slightly better than that of the untreated cloth.
× ……… The feeling of centering is almost the same as that of the unprocessed fabric.
Alternatively, the fabric is dissolved and hardened due to excessive weight loss.
(PH)
A 1% by weight aqueous solution of each weight reducing agent (A) was prepared, and the pH (20 ° C.) of the aqueous solution was measured using a pH meter (F-51) manufactured by Horiba.
(Drapability)
Conforms to JIS-L-1096 8.19.7 G method. The drape coefficient was measured using a drape tester (manufactured by Daiei Scientific Instruments).

Example 1
A polyamide-based fabric 3 g using 70 denier 6,6-nylon as the warp and polyester as the weft was used. As shown in Table 1, 150 g of a treatment solution in which polymerized sodium phosphate is 0.1% by weight and the balance is water (99.9% by weight) as a weight loss processing agent (A) is prepared as shown in Table 1. Were placed in a dyeing pot associated with the weight loss processing apparatus. Next, the fabric was put in a dyeing pot, and weight reduction processing was performed at 110 ° C. for 90 minutes under the following processing conditions. The weight-reduced fabric was sufficiently washed with water and dried with a pin tenter at 130 ° C. for 3 minutes. The weight loss rate, tear strength, and drape coefficient of the dried fabric were measured to determine the texture. The results are shown in Table 1.

(Processing conditions)
Dyeing machine: Rotating pot dyeing tester (12EL type) manufactured by Tecsum Giken Co., Ltd. is used.
In order to reproduce the physical stagnation effect of the actual liquid dyeing machine, 20 stainless steel balls having a diameter of about 6 mm as defined in JIS-G-4303 were placed in the treatment bath and subjected to weight reduction processing.
Fabric amount: 3g
Processing temperature × processing time: 110 ° C. × 90 minutes Bath ratio: 1:50
Treatment concentration: 0.1% by weight
Treatment bath: Use 99.9% by weight of tap water as a solvent. Rotation speed of dyeing pot: 50 rpm

(Examples 2-15, Comparative Examples 1-6)
Examples 2 to 15 and Comparative Examples 1 to 6 were the same as in Example 1 except that the weight loss accelerator (A) shown in Table 1 and its weight% were changed in the treatment liquid of Example 1. Evaluation of characteristics was performed. The results are shown in Table 1.

(Example 16)
Example 16 is a treatment liquid of Example 1, in which 0.1% by weight of polymerized sodium phosphate was used as the weight loss accelerator (A), and 0.1% by weight of POE (10) lauryl ether was used as the weight reduction accelerator (B). %, Each property was evaluated in the same manner as in Example 1 except that the treatment liquid was water (99.8% by weight). The results are shown in Table 3.

(Examples 17 to 33 and Comparative Examples 7 to 12)
In Examples 17 to 33 and Comparative Examples 7 to 12, the weight loss accelerator (A) and its weight%, and the weight loss processing accelerator (B) and its weight% shown in Table 2 were changed in the treatment liquid of Example 16, respectively. Each characteristic was evaluated in the same manner as in Example 1 except that. The results are shown in Table 3.

  As a result, as is clear from Tables 1 to 3, the weight-reduced polyamide-based fabric of the Examples has a tear strength of 0.03 to 0.50 N / d, a weight loss rate of 0.4 to 4.5%, A fabric having a drape coefficient in the range of 0.15 to 0.28, uniformly reduced in weight, maintaining an appropriate strength for apparel use and expressing a good texture was obtained.

The fabric thus obtained exhibited a soft texture with a high drape that was not obtained with the prior art. Furthermore, in the method for producing a weight-reduced polyamide fabric according to the present invention, a part of the fiber is fibrillated, so that fibrillation of the fiber surface was observed in an electron microscope observation.
Moreover, in the manufacturing method of this invention, when performing weight reduction of a polyamide-type fabric, not a special composite fiber but a general-purpose polyamide-type fabric can be used, and economical weight reduction processing can be performed in a short time. Furthermore, since it is possible to perform weight loss processing with a normal liquid flow dyeing machine, it is possible to reduce weight in a general dyeing factory by finding appropriate processing conditions such as mechanical conditions. .

Claims (9)

A method for producing a weight-reduced polyamide fabric,
Including a step of weight-reducing the polyamide-based fabric using a treatment liquid containing the weight-reducing processing agent (A), and the weight-reducing processing agent (A) has a pH (20 ° C.) of a 1 wt% aqueous solution of 2 or more and less than 7. A method for producing a weight-reduced polyamide-based fabric, which is a compound.   The weight loss processing agent (A) is at least selected from carboxylic acids having 10 or less carbon atoms, phosphorus atom-containing oxoacids, phosphorus atom-containing oxoacid salts, boron atom-containing oxoacids and sulfur atom-containing oxoacid salts. The method for producing a weight-reduced polyamide-based fabric according to claim 1, which is one type.   The method for producing a weight-reduced polyamide-based fabric according to claim 1 or 2, wherein the weight loss processing agent (A) essentially contains a sulfur atom-containing oxoacid salt.   The manufacturing method of the weight-reduced polyamide-type fabric in any one of Claims 1-3 in which the said process liquid further contains the weight loss process promoter (B) which consists of at least 1 sort (s) of nonionic surfactant.   The method for producing a weight-reduced polyamide-based fabric according to claim 4, wherein the nonionic surfactant has an HLB of 10 to 20 and a weight average molecular weight of 800 or more.   The method for producing a weight-reduced polyamide-based fabric according to claim 4 or 5, wherein the nonionic surfactant has at least one aromatic ring in the molecule.   The weight reduction processing according to any one of claims 4 to 6, wherein a weight ratio (B / A) of the weight reduction processing accelerator (B) to the weight reduction processing agent (A) is 0.5 to 5.0. A method for producing a polyamide-based fabric.   The method for producing a weight-reduced polyamide-based fabric according to any one of claims 1 to 7, wherein in the step, the temperature when weight-reducing the polyamide-based fabric is 100 to 140 ° C.   A weight-reduced polyamide-based fabric obtained by the production method according to claim 1, wherein the fabric has a strength per unit denier of 0.03 to 0.50 N / d. Processed polyamide fabric.