JP5277131B2 - Water permeability imparting agent, water permeable fiber, and method for producing nonwoven fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water penetrability-imparting agent having all of instantaneous water penetrability, water penetration durability, card passableness and thermal adhesiveness (nonwoven fabric strength) at high performance levels, to provide a water-penetrating fiber having the water penetrability-imparting agent adhered thereto, and to provide a method for producing the nonwoven fabric. <P>SOLUTION: The water penetrability-imparting agent contains ingredients A, B and C as essential ingredients in prescribed amounts, respectively, wherein, the ingredient A is a condensate of a polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester with a dicarboxylic acid (or dicarboxylic acid derivative), or the same; the ingredient B is a mineral oil and/or an ester obtained from at least one selected from monohydric alcohols, polyhydric alcohols and their alkylene oxide adducts with an aliphatic carboxylic acid and/or a thiodicarboxylic acid; the ingredient C is an alkylphosphate salt whose alkyl group has 6 to 22 carbon atoms and/or a polyoxyalkylene group-containing alkylphosphate salt. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a water permeability-imparting agent, a water-permeable fiber treated with the same, and a method for producing a nonwoven fabric. Specifically, by imparting the water permeability-imparting agent of the present invention to the hydrophobic synthetic fiber for nonwoven fabric production, excellent permeability is obtained in the card process during nonwoven fabric production, and the resulting nonwoven fabric is instantly water permeable. TECHNICAL FIELD The present invention relates to a water permeability imparting agent, water permeable fiber and a method for producing a nonwoven fabric which are also excellent in properties, durable water permeability and nonwoven fabric strength.

  In general, absorbent articles such as sanitary goods such as disposable diapers and synthetic napkins, topsheets that impart hydrophilicity to various nonwoven fabrics mainly composed of hydrophobic synthetic fibers (polyolefin fibers, polyester fibers, etc.) It has a structure formed by three layers in which a material made of cotton-like pulp, a polymer absorber or the like is disposed between the absorbent material and the water-repellent back sheet. Although liquids such as urine and body fluid pass through the top sheet and are absorbed by the absorber, the water permeability is good, that is, the time until the liquid is completely absorbed from the top sheet to the internal absorber is extremely short. Instant water permeability is required. Furthermore, it is not preferable that the treatment agent on the top sheet flows out due to absorption of the liquid only once or twice and the water permeability decreases rapidly, because this increases the number of replacements of the absorbent article. The sheet is required to have durable water permeability that can withstand repeated liquid absorption. Also, from the non-woven fabric production side, it is difficult to obtain non-woven fabric with excellent surface quality when winding around the cylinder, scum, or napping on the web occurs as the card process speeds up. Is required. For hydrophobic synthetic fibers that are extremely inferior in hydrophilicity, there is a demand for a water-permeability imparting agent that meets the above requirements and a water-permeable fiber to which it adheres.

  Techniques have been proposed for improving these characteristics with water permeability imparting agents. The water permeability imparting agent is simultaneously required to have the required properties of water permeability on the surface of a hydrophobic synthetic fiber and good water permeability even for repeated liquid water permeation, and the alkyl phosphate salt and the cationic interface. It was compensated by adjusting the blending ratio of the activator and amphoteric surfactant. However, even when instantaneous water permeability is obtained, durable water permeability is insufficient, or even when durable water permeability is obtained to some extent, instantaneous water permeability is insufficient. A product satisfying both durable water permeability was not obtained. Further, even in the card process, which is a process for manufacturing a nonwoven fabric, there are problems that scum is generated in the card machine and napping is generated in the web. In addition, the hydrophilic component contained in the water-permeability imparting agent may inhibit the adhesion between fibers during heat fusion, and there is a problem of reducing the strength of the nonwoven fabric.

  For example, Patent Document 1 discloses a method in which a polyether-modified silicone is used in combination with an alkyl phosphate ester salt, but it lacks durable water permeability, card permeability and nonwoven fabric strength. Patent Document 2 discloses a method in which two types of amphoteric surfactants are used in combination with an alkyl phosphate ester salt, but the durable water permeability is insufficient. Patent Document 3 proposes a method in which an acylated polyamine cationized product of polyoxyalkylene fatty acid amide, an alkyl phosphate salt, an amphoteric surfactant, and a polyoxyalkylene-modified silicone are used in combination, but the card passing property and the nonwoven fabric strength are insufficient. . Patent Document 4 discloses a treatment agent containing a betaine type amphoteric activator, a dicarboxylic acid ester of a polyoxyalkylene adduct of an oxy fatty acid ester, and an anionic surfactant. However, the card passing property, instantaneous water permeability and durability are disclosed. Water permeability is insufficient. Patent Document 5 proposes a method of treating fibers by using an alkyl phosphate salt in combination with an amphoteric surfactant, an alkoxylated ricinolein type compound, and a polyoxyalkylene-modified silicone, but the card passing property and the nonwoven fabric strength are insufficient. In Patent Document 6, at least one of an alkyl phosphate salt, a cationized product of (poly) amine having a polyoxyalkylene group and an acyl group, and a condensate of a polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester and a dicarboxylic acid Although a method of treating fibers using a combination of an ester having a hydroxyl group blocked with a fatty acid, a dialkylsulfosuccinate salt, a trialkylglycine derivative, and a polyoxyalkylene-modified silicone has been proposed, the card passing ability and the nonwoven fabric strength are insufficient. .

In this way, these treatment agents are not only at the level of instantaneous water permeability and durable water permeability required for current hygiene material applications, but also in the card machine, which is a non-woven fabric manufacturing process. The problem of scum and web napping has become more frequent as the card process speeds up. Furthermore, while the form of the final product is highly functional, the problem that the non-woven fabric strength is deteriorated due to the thermal adhesion between fibers being inhibited by the application of the treatment agent has not been negligible.
As described above, these treatment agents cannot satisfy all performance levels. Therefore, a treatment agent that can satisfy the above-mentioned performance at a high level in hygiene material applications is desired.

JP-A-4-82961 JP 2000-170076 A JP 2002-161474 A JP 2000-34672 A JP 2002-161477 A JP 2007-247128 A

  Accordingly, the present invention solves the conventional problems, and provides a water permeability imparting agent having a high performance level in terms of instantaneous water permeability, durable water permeability, card permeability, and thermal adhesiveness (nonwoven fabric strength). The present invention provides a method for producing a water-permeable fiber and a non-woven fabric to which water adheres.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved if the water permeability imparting agent contains A component, B component and C component as essential components. It came to be completed.

  That is, the present invention is a water permeability imparting agent containing an A component, a B component and a C component as essential components, wherein the A component comprises a polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester and a dicarboxylic acid (or dicarboxylic acid). Derivative) and / or an ester obtained by blocking at least one hydroxyl group of the condensate with a fatty acid, and the component B is selected from monohydric alcohols, polyhydric alcohols, and alkylene oxide adducts thereof. An ester and / or mineral oil obtained from at least one kind and an aliphatic carboxylic acid and / or a thiodicarboxylic acid, wherein the C component is an alkyl phosphate salt and / or polyalkyl having an alkyl group having 6 to 22 carbon atoms. It is an oxyalkylene group-containing alkyl phosphate salt, and the water permeability-imparting agent The weight ratio of the A component in the entire nonvolatile content is 10 to 45% by weight, the weight ratio of the B component is 5 to 40% by weight, the weight ratio of the C component is 10 to 50% by weight, and the A component, the B component, and It is a water-permeability imparting agent having a total weight ratio of component C of 50% by weight or more.

  The polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester of component A is an alkylene oxide adduct of an ester of a hydroxy fatty acid having 6 to 22 carbon atoms and a polyhydric alcohol, and the dicarboxylic acid has 2 to 10 carbon atoms. It is preferred that the fatty acid has 10 to 50 carbon atoms.

  The B component ester is preferably an ester obtained from a monohydric alcohol and / or polyhydric alcohol and an aliphatic carboxylic acid and / or thiodicarboxylic acid. The mineral oil of component B is preferably at least one selected from machine oil, spindle oil and liquid paraffin.

（式中、Ｒ^１は炭素数６〜２２のアルキル基であり、ＡＯは炭素数２〜４のオキシアルキレン基であり、ｍは０〜１５の整数であり、ｎは１〜２の整数であり、Ｙ^＋は、水素イオン、アルカリ金属イオン、アンモニウムイオンおよび第１級〜第３級アンモニウムイオンらなる群から選択されるイオン性残基である。） The component C is preferably a compound represented by the following general formula (1).

(In the formula, R ¹ is an alkyl group having 6 to 22 carbon atoms, AO is an oxyalkylene group having 2 to 4 carbon atoms, m is an integer of 0 to 15, and n is an integer of 1 to 2). Y ⁺ is an ionic residue selected from the group consisting of hydrogen ions, alkali metal ions, ammonium ions, and primary to tertiary ammonium ions.

Moreover, the water-permeability imparting agent according to the present invention further comprises at least one D component selected from the following D1 component, D2 component and D3 component, and the D component occupying the entire nonvolatile content of the water-permeability imparting agent. It is preferable that a weight ratio is 5 to 50 weight%.
D1 component: propylene oxide (hereinafter abbreviated as PO) / ethylene oxide (hereinafter abbreviated as EO) adduct and / or polyoxyalkylene-modified silicone of monohydric aliphatic alcohol having 4 to 24 carbon atoms D2 component: carboxylate, sulfonic acid At least one selected from salts, sulfosuccinates and sulfate esters D3 component: quaternary ammonium salt type cationic surfactant, imidazolinium type cationic surfactant, alkylbetaine surfactant, alkylimidazole type betaine surfactant Agent, at least one selected from amide group-containing betaine surfactants and higher fatty acid alkanolamide surfactants

  Moreover, it is preferable that the water-permeability imparting agent according to the present invention is used for hydrophobic synthetic fibers for producing nonwoven fabrics.

The water-permeable fiber according to the present invention is obtained by treating the hydrophobic synthetic fiber for producing a nonwoven fabric with the above water-permeability imparting agent.
The manufacturing method of the nonwoven fabric concerning this invention includes the process of accumulating said water-permeable fiber, producing a fiber web, and thermally bonding the obtained fiber web.

  The water-permeability imparting agent according to the present invention, the water-permeable fiber and the nonwoven fabric treated with the water-permeability imparting agent have a high performance level in any of instantaneous water permeability, durable water permeability, card passage property and thermal adhesiveness.

  The present invention is a water permeability imparting agent containing a predetermined amount of A component, B component and C component as essential components. Details will be described below.

[Component A]
Component A is a polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester (hereinafter sometimes referred to as polyhydroxy ester) and a dicarboxylic acid (or dicarboxylic acid derivative) and / or at least one hydroxyl group of the condensate Is an ester blocked with a fatty acid. The component A is an essential component contained in the water-permeability imparting agent of the present invention, and has a strong adsorptivity to the polymer used as the raw material for the hydrophobic fiber. It becomes difficult to drop off. As a result, it is a component that can maintain water permeability repeatedly.
Here, the dicarboxylic acid derivative is a derivative capable of forming a hydroxyl group-containing compound and a carboxylic acid ester by an esterification reaction or an ester substitution reaction. That is, alkyl esters of dicarboxylic acids, acid anhydrides, amides and the like can be mentioned.

  The polyhydroxyester is structurally an ester of a polyoxyalkylene group-containing hydroxy fatty acid and a polyhydric alcohol, and two or more (preferably all) hydroxyl groups of the polyhydric alcohol are esterified. Therefore, the polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester is an ester having a plurality of hydroxyl groups.

The polyoxyalkylene group-containing hydroxy fatty acid has a structure in which a polyoxyalkylene group is bonded to a fatty acid hydrocarbon group via an oxygen atom, and one end that is not bonded to the fatty acid hydrocarbon group of the polyoxyalkylene group is It is a hydroxyl group.
Examples of the polyhydroxyester include an alkylene oxide adduct of an esterified product of a hydroxy fatty acid having 6 to 22 carbon atoms (preferably 12 to 22 carbon atoms) and a polyhydric alcohol. When the number of carbon atoms of the hydroxy fatty acid is less than 6, the hydrophilicity becomes strong, while when it exceeds 22, the hydrophobicity becomes strong. In either case, the compatibility with other components deteriorates, so that sufficient durable water permeability may not be obtained.

Examples of the hydroxy fatty acid having 6 to 22 carbon atoms include hydroxycaprylic acid, hydroxycapric acid, hydroxyundecanoic acid, hydroxylauric acid, hydroxystearic acid, and ricinoleic acid, and hydroxystearic acid and ricinoleic acid are preferable.
Examples of the polyhydric alcohol include ethylene glycol, glycerin, trimethylolpropane, sorbitan, sorbitol, pentaerythritol and the like, and glycerin is preferable. Examples of the alkylene oxide include C2-C4 alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide.

The number of moles of alkylene oxide added is preferably 80 or less, more preferably 5-30, per mole equivalent of hydroxyl group of the hydroxy fatty acid polyhydric alcohol ester. If the added mole number exceeds 80, the liquid return amount may increase, which is not preferable. In order to obtain high durable water permeability, it is important to adjust the balance between the hydrophilic group and the hydrophobic group. The proportion of ethylene oxide in the alkylene oxide is preferably 40% by weight or more, more preferably 75% by weight or more. If the ratio of ethylene oxide is less than 40% by weight, the hydrophobicity becomes strong and sufficient durable water permeability may not be obtained.
When two or more types of alkylene oxide are added, the order of addition is not particularly limited, and the addition form may be either a block form or a random form. The addition of the alkylene oxide can be performed by a known method, but it is generally performed in the presence of a basic catalyst.

The polyhydroxyester can be produced, for example, by esterifying a polyhydric alcohol and a hydroxy fatty acid (hydroxymonocarboxylic acid) under ordinary conditions to obtain an esterified product, and then subjecting the esterified product to an addition reaction with an alkylene oxide. The polyhydroxyester can be suitably produced also by using an oil and fat obtained from nature such as castor oil or a hardened castor oil obtained by adding hydrogen to this, and further subjecting it to an addition reaction with an alkylene oxide.
When producing a polyhydroxyester, it is preferable that the carboxyl group equivalent of the hydroxy fatty acid per 1 molar equivalent of the hydroxyl group of a polyhydric alcohol is in the range of 0.5-1.

When producing the condensate of polyhydroxyester and dicarboxylic acid (or dicarboxylic acid derivative), the carboxyl group equivalent of dicarboxylic acid per 1 molar equivalent of hydroxyl group of polyhydroxyester may be in the range of 0.2-1. Preferably, 0.4 to 0.8 is more preferable. In order to obtain the above-mentioned condensate, there may be used general reaction conditions for obtaining an esterified product such as a normal esterification reaction or ester substitution reaction, and there is no particular limitation.
2-10 are preferable and, as for carbon number of the dicarboxylic acid part of dicarboxylic acid (or dicarboxylic acid derivative), 2-8 are more preferable. If the carbon number of the dicarboxylic acid exceeds 10, sufficient hydrophilicity may not be imparted.

Examples of the raw material dicarboxylic acid that gives such a condensate include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid and the like. Can be mentioned.
In addition to the dicarboxylic acid used as the raw material for the condensate, malonic anhydride, succinic anhydride, glutaric anhydride, adipic anhydride, pimelic anhydride, suberic acid anhydride, azelaic anhydride, sebacic anhydride Examples thereof include acid anhydrides such as acid and maleic anhydride, and dicarboxylic acid esters such as dimethyl malonate, diethyl malonate, and dimethyl adipate, but are not limited thereto.
Along with the dicarboxylic acid (or dicarboxylic acid derivative), a carboxylic acid such as lauric acid, oleic acid, stearic acid, behenic acid, benzoic acid or the like may be contained in an amount of 20% or less (preferably 10% or less).

The component A of the present invention is a condensate of polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester and dicarboxylic acid (hereinafter sometimes referred to as a condensate), and at least one hydroxyl group is blocked with a fatty acid. Good. 10-50 are preferable and, as for carbon number of the fatty acid to block, 12-36 are more preferable. Further, when the number of carbon atoms of the fatty acid is less than 10, the hydrophilicity becomes strong, and when it exceeds 50, the hydrophobicity becomes strong. In this way, the hydrophilicity and hydrophobicity of the condensate can be adjusted according to the other components to be blended and the fibers to be imparted, and sufficient durable water permeability can be obtained.
Examples of such fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, icosanoic acid, behenic acid, lignoceric acid, nervonic acid, serotic acid, montanic acid, melicic acid, lanolin fatty acid (wool grease) A fatty acid having a carbon number of 12 to 36, which is a lanolin derivative purified from the above, and stearic acid, behenic acid, and lanolin fatty acid are preferred. In the case of producing an ester of a condensate and a fatty acid, the carboxyl group equivalent of the fatty acid per 1 molar equivalent of the hydroxyl group of the condensate is preferably in the range of 0-1. There are no particular limitations on the reaction conditions for esterification.

  The weight ratio of the component A in the nonvolatile content of the water permeability imparting agent is 10 to 45% by weight, more preferably 15 to 45% by weight, further preferably 15 to 40% by weight, and particularly preferably 15 to 35% by weight. When the weight ratio of the component A is less than 10% by weight, the instantaneous water permeability is improved, but the durable water permeability is lowered. On the other hand, when the weight ratio of the component A is more than 45% by weight, the durable water permeability is improved but the card passing property is lowered. A component may use 1 type (s) or 2 or more types.

  The non-volatile content of the water-permeability imparting agent in the present invention means a component in the water-permeability imparting agent remaining on the fiber surface even after the heat drying step for removing moisture and the like. It means a component that remains without being volatilized when it reaches a constant weight by removing heat and the like by heat treatment.

[B component]
Component B is an ester (b1) and / or mineral oil (b2) obtained from at least one selected from monohydric alcohols, polyhydric alcohols, and alkylene oxide adducts thereof, and aliphatic carboxylic acid and / or thiodicarboxylic acid. ). The water-permeability imparting agent of the present invention has excellent instantaneous water permeability, durable water permeability, card passing property, and further heat between fibers by containing a predetermined amount of B component in addition to A component and C component. The adhesiveness is not hindered and the strength of the nonwoven fabric can be increased.

Although it does not specifically limit as a monohydric alcohol of the raw material which comprises ester (b1), A monohydric aliphatic alcohol etc. are mentioned. The carbon number of the monovalent aliphatic alcohol may be distributed. Moreover, it may be saturated or unsaturated, may be linear, and may have a branch. 1-22 are preferable, as for carbon number of an aliphatic alcohol, 1-18 are more preferable, 4-18 are more preferable, and 8-18 are especially preferable.
Examples of the monohydric alcohol include methanol, ethanol, butanol, 2-ethylhexanol, lauryl alcohol, palmityl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, and behenyl alcohol.
As for the alkylene oxide adduct of a monohydric alcohol, the alkylene oxide has preferably 2 to 4 carbon atoms. When two or more types of alkylene oxide are added, the order of addition is not particularly limited, and the addition form may be either a block form or a random form. Moreover, 0-150 are preferable, as for the addition mole number of alkylene oxide, 0-50 are more preferable, 0-20 are especially preferable, and 0 is the most preferable.

Although it does not specifically limit as a polyhydric alcohol of the raw material which comprises ester (b1), A 2-8 valent alcohol etc. are mentioned, A 2-6 valent alcohol is preferable and a 2-4 valent alcohol is preferable.
Examples of the polyhydric alcohol include diols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, glycerin, trimethylolpropane, sorbitol, sorbitan, pentaerythritol, sucrose, and the like. Polyols. Furthermore, polyglycerin such as diglycerin, triglycerin, tetraglycerin and hexaglycerin, which is a condensate of glycerin, is also included.
As for the alkylene oxide adduct of an alkylene oxide of a polyhydric alcohol, the alkylene oxide preferably has 2 to 4 carbon atoms. When two or more types of alkylene oxide are added, the order of addition is not particularly limited, and the addition form may be either a block form or a random form. Moreover, 0-150 are preferable, as for the addition mole number of alkylene oxide, 0-50 are more preferable, 0-20 are especially preferable, and 0 is the most preferable.

  The starting aliphatic carboxylic acid constituting the ester (b1) is preferably an aliphatic carboxylic acid having no hydroxyl group in the molecule (not a hydroxycarboxylic acid). The aliphatic carboxylic acid is not particularly limited, and may be a fatty acid or an aliphatic polycarboxylic acid. The fatty acid may be a saturated fatty acid or an unsaturated fatty acid. Among these, saturated fatty acids are preferable, and the number of carbon atoms of the fatty acids is preferably 4 to 30, more preferably 4 to 22, and particularly preferably 4 to 18.

Examples of saturated fatty acids include caproic acid, caprylic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, stearic acid, nonadecanoic acid, arachidic acid, behenic acid, serotic acid, montan An acid, a mellic acid, etc. are mentioned.
Examples of the unsaturated fatty acid include oleic acid, elaidic acid, erucic acid, linoleic acid, linolenic acid, and the like.

Examples of the aliphatic polycarboxylic acid include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, tricarballylic acid, citric acid, etc. Is mentioned.
These aliphatic polycarboxylic acid anhydrides can also be used, such as malonic anhydride, succinic anhydride, glutaric anhydride, adipic anhydride, pimelic anhydride, suberic acid anhydride, azelaic anhydride, sebacic anhydride Examples include acid, maleic anhydride, and anhydrous citric acid.

  The raw material thiodicarboxylic acid constituting the ester (b1) is an organic compound in which two carboxylic acids are bonded by a sulfide (a divalent sulfur atom), such as thiodiacetic acid, thiodipropionic acid, thiodibutyric acid, thiodisuccinic acid. Examples of the acid include thiodipropionic acid.

  The ester (b1) is a known synthesis method by appropriately selecting at least one selected from the aforementioned monohydric alcohols, polyhydric alcohols, and alkylene oxide adducts thereof, and aliphatic carboxylic acids and / or thiodicarboxylic acids. Can be obtained.

  Esters obtained from polyhydric alcohols and fatty acids include coconut oil, palm oil and soybean oil, natural fats and oils such as beef tallow, hydrogenated palm oil and soybean oil and beef tallow, Bean oil, hardened beef tallow, etc. may be used.

  As the ester obtained from the polyhydric alcohol alkylene oxide adduct and the aliphatic carboxylic acid, an ester obtained from the polyhydric alcohol and the aliphatic carboxylic acid and then added with an alkylene oxide having 2 to 4 carbon atoms is used. May be.

  Examples of the ester obtained from monohydric alcohol and / or alkylene oxide adduct of monohydric alcohol and aliphatic carboxylic acid include 2-ethylhexyl oleate, isooctyl oleate, lauryl oleate, stearyl oleate, oleyl oleate, Tridecyl oleate, butyl stearate, isooctyl stearate, oleyl isostearate, oleyl stearate, isotridecyl stearate, isopropyl palmitate, isooctyl palmitate, oleyl palmitate, tridecyl palmitate, tridecyl laur Oleyl laurate polyoxyethylene (10 mol) stearyl ether oleate, dioctyl adipate, dilauryl adipate, diisotridecyl adipate, diisos Ariruajipeto, dioleyl adipate, dioctyl fumarate, dioctyl phthalate.

  Examples of the ester obtained from polyhydric alcohol and / or alkylene oxide adduct of polyhydric alcohol and aliphatic carboxylic acid include ethylene glycol dioleate, glycerin monooleate, glycerin monostearate, glycerin trioleate, hexaglycerin mono Stearate, trimethylolpropane trilaurate, trimethylolpropane trioleate, trimethylolpropane monopalmitate, pentaerythritol tetraoleate, sorbitan monooleate, polyoxyethylene (20 mol) glycerin monostearate, polyoxyethylene ( 20 mol) sorbitan trioleate, di (3-hydroxypropyl) succinate, methyl succinate (3-hydroxypropyl) and the like.

  Examples of the ester obtained from thiodicarboxylic acid and at least one selected from monohydric alcohols, polyhydric alcohols, and alkylene oxide adducts thereof include dilauryl thiodipropionate, distearyl thiodipropionate, and dioleylthiodipro. Pionate, dimyristyl thiodipropionate, ditridecyl thiodipropionate, mixed esters of thiodipropionic acid (lauryl, stearyl and oleyl), and the like.

The ester (b1) is preferably a component having fluidity at 40 ° C. from the viewpoint of not inhibiting the thermal adhesiveness in terms of properties, and the viscosity at 40 ° C. is more preferably 3 to 400 mm ² / s, and 3 to 300 mm ^2. / S is more preferable, and 3-200 mm ² / s is particularly preferable. If it exceeds 400 mm ² / s, the viscosity may be too high and the card passing property may be impaired.

B component mineral oil (b2) is preferably at least one selected from machine oil, spindle oil and liquid paraffin. The viscosity of the mineral oil at 40 ° C. is preferably in the range of 40 to 200 seconds (4 to 50 mm ² / s) with a Redwood viscometer, more preferably 40 to 160 seconds, still more preferably 60 to 160 seconds, 60 -120 seconds are particularly preferred. If it is less than 40 seconds, mineral oil volatilizes with the standing time when the fiber after refueling is left. If it exceeds 200 seconds, the viscosity is too high and the card passing property may be hindered.

Among the B components, a component having fluidity at 40 ° C. is preferable from the viewpoint of not hindering thermal adhesiveness in terms of properties, and ester (b1) is more preferable in terms of high nonwoven fabric strength that correlates with thermal adhesiveness. Particularly preferred are esters obtained from monohydric alcohols and / or polyhydric alcohols and aliphatic carboxylic acids and / or thiodicarboxylic acids.
Particularly preferred examples of these B components include isooctyl palmitate, isooctyl stearate, isotridecyl stearate, dioleyl adipate, dioctyl fumarate, ethylene glycol dioleate, trimethylolpropane trilaurate, glycerin trioleate. , Pentaerythritol tetraoleate, and dioleyl thiodipropionate.

  5-40 weight% is preferable, as for the weight ratio of B component to the whole non volatile matter of a water-permeability imparting agent, 5-35 weight% is more preferable, and 10-35 weight% is especially preferable. When the weight ratio of the component B is less than 5% by weight, the improvement in thermal adhesiveness is not exhibited, and the strength of the nonwoven fabric cannot be increased. On the other hand, when the weight ratio exceeds 40% by weight, the water-solubility of the water-permeability imparting agent is insufficient, so that the solution stability is lowered, and the durability and water permeability and the antistatic property in the card process are lowered. B component may use 1 type (s) or 2 or more types.

[C component]
In addition to the A component and the B component, the water-permeability imparting agent of the present invention includes, as an essential component, an alkyl phosphate salt having an alkyl group having 6 to 22 carbon atoms and / or a polyoxyalkylene group-containing alkyl phosphate salt. Including. The component C is a component that is particularly excellent in card passing performance and performance for maintaining durable water permeability.
The component C is preferably an alkyl phosphate salt represented by the above general formula (1).

In General Formula (1), R ¹ is an alkyl group having 6 to 22 carbon atoms, preferably 6 to 20 carbon atoms, more preferably 8 to 20 carbon atoms, and still more preferably 8 to 18 carbon atoms. If the carbon number of the alkyl group is less than 6, the card process passability may decrease and the odor of the product may become strong. If the alkyl group has more than 22 carbon atoms, the water solubility of the compound, the card passability, and the instantaneous Water permeability may decrease. The carbon number of the alkyl group may be distributed, the alkyl group may be linear or branched, and may be saturated or unsaturated.
AO is an oxyalkylene group having 2 to 4 carbon atoms. M which is the number of repeating oxyalkylene units is an integer of 0 to 15, preferably 0 to 10, more preferably 0 to 3, and particularly preferably m is 0 and no polyoxyalkylene group is contained. (AO) _m is preferably a polyoxyalkylene group having 50 mol% or more of oxyethylene units as oxyalkylene units. n is an integer of 1-2.

Y ⁺ is an ionic residue selected from the group consisting of hydrogen ions, alkali metal ions, ammonium ions, and primary to tertiary ammonium ions. These may be a mixture, or one or more may be used.
Examples of the alkali metal ion include sodium ion and potassium ion.
The primary to tertiary ammonium ions may be any of primary, secondary, and tertiary ammonium ions, and may be alkyl ammonium ions or alkanol ammonium ions. Examples of primary to tertiary ammonium ions include monoethanolammonium ions, diethanolammonium ions, triethanolammonium ions, dibutylethanolammonium ions, and the like.

  Among these, C component is octyl phosphate potassium salt, decyl phosphate potassium salt, lauryl phosphate potassium salt, tridecyl phosphate potassium salt, myristyl phosphate potassium salt, for the reason of improving the performance of maintaining card permeability and durable water permeability. Cetyl phosphate potassium salt, stearyl phosphate potassium salt, oleyl phosphate potassium salt, polyoxyethylene 3 mol addition cetyl phosphate potassium salt, polyoxyethylene 3 mol addition lauryl phosphate sodium salt, polyoxyethylene 3 mol addition lauryl phosphate diethanolammonium salt, poly Oxyethylene 3-mole-added lauryl phosphate triethanolammonium salt is preferred, octyl phosphate potassium salt, lauryl Scan phosphate potassium salt, stearyl phosphate potassium salt is more preferable.

  The weight ratio of the C component in the entire nonvolatile content of the water permeability imparting agent is preferably 10 to 50% by weight, more preferably 10 to 45% by weight, further preferably 10 to 40% by weight, particularly 10 to 35% by weight. preferable. When the weight ratio of the C component is less than 10% by weight, the card passing property is lowered. On the other hand, when the weight ratio exceeds 50% by weight, the durable water permeability decreases. C component may use 1 type (s) or 2 or more types.

[D component]
The water-permeability imparting agent of the present invention may further contain at least one D component selected from the aforementioned D1 component, D2 component and D3 component. The weight ratio of the D component in the entire nonvolatile content of the water-permeability imparting agent is preferably 5 to 50% by weight, more preferably 10 to 45% by weight, from the viewpoint of improving card passability and nonwoven fabric strength. % Is more preferable, and 20 to 35% by weight is particularly preferable.

The D1 component is a propylene oxide (hereinafter abbreviated as PO) / ethylene oxide (hereinafter abbreviated as EO) adduct (D1a component) and / or polyoxyalkylene-modified silicone (D1b component) of a monohydric aliphatic alcohol having 4 to 24 carbon atoms. It is.
The D1a component is not particularly limited. For example, the monohydric aliphatic alcohol having 4 to 24 carbon atoms constituting the D1a component may be a higher alcohol obtained by reduction of a natural higher fatty acid, or a synthetic alcohol. There may be. The carbon number of the monohydric aliphatic alcohol may be distributed. Moreover, it may be saturated or unsaturated, may be linear, and may have a branch. 6-22 are preferable, as for carbon number of monohydric aliphatic alcohol, 8-22 are more preferable, and 8-18 are especially preferable.
Examples of the monohydric aliphatic alcohol having 4 to 24 carbon atoms include 2-ethylhexanol, lauryl alcohol, palmityl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, and behenyl alcohol.
The number of added moles of ethylene oxide (EO) and propylene oxide (PO) is not particularly limited, but the number of added moles of EO is preferably 1 to 150, and more preferably 1 to 50. Moreover, 0-150 are preferable and, as for the addition mole number of PO, 0-50 are more preferable. In order to obtain good dispersibility when diluted with water, the addition amount of ethylene oxide is preferably 20 to 100% by weight of the total amount of ethylene oxide and propylene oxide, and more preferably 30 to 100% by weight. The addition order of ethylene oxide and propylene oxide is not particularly limited, and the addition form may be either block or random. Addition of ethylene oxide and propylene oxide can be carried out by a known method, but is generally carried out in a higher alcohol in the presence of a basic catalyst. In addition, 1 type (s) or 2 or more types may be used for D1a component.

  Examples of the polyoxyalkylene-modified silicone (D1b component) include dimethylsiloxane / methyl (polyoxyethylene) siloxane copolymer, dimethylsiloxane / methyl (polyoxypropylene) siloxane copolymer, dimethylsiloxane / methyl (polyoxyethylene / polyoxy). Oxypropylene) siloxane copolymer, methyl (polyoxyethylene) polysiloxane copolymer, methyl (polyoxypropylene) polysiloxane copolymer, methyl (polyoxyethylene / polyoxypropylene) polysiloxane copolymer, methyl ( Polyoxyethylene / polyoxybutylene) polysiloxane copolymer and the like.

The Si element content in the polyoxyalkylene-modified silicone (weight% occupied by Si element in the compound) is 20 to 70%. When the Si element content is more than 70%, the stability of the water-permeable fiber obtained by attaching the water-permeability imparting agent of the present invention is lowered, and the production cost is increased. On the other hand, if the Si element content is less than 20%, durable water permeability may not be obtained.
Examples of the polyoxyalkylene group in the polyoxyalkylene-modified silicone include, for example, an oxyethylene group, an oxypropylene group, an oxybutylene group, a group obtained by polymerizing two or more monomers selected from these monomers, and the like. Can be mentioned. When two or more types of oxyalkylene groups are selected, the order of addition thereof is not particularly limited, and the addition form may be either a block form or a random form. The proportion of oxyethylene groups in the entire polyoxyalkylene group is preferably 20% by weight or more, and if it is less than 20% by weight, water permeability may be lowered.

The weight average molecular weight of the polyoxyalkylene-modified silicone is not particularly limited, but is preferably 1,000 to 100,000, and more preferably 2,000 to 80,000. When the weight average molecular weight is out of this range, the water permeability decreases, and this tendency is remarkable particularly when the weight average molecular weight is less than 1,000.
In the present invention, these polyoxyalkylene-modified silicones can be used alone or in combination of two or more.

  The D2 component is at least one selected from carboxylate (D2a component), sulfate ester salt (D2b component), sulfonate (D2c component), and sulfosuccinate (D2d component).

  The carboxylate (D2a component) is an alkali metal salt of a higher fatty acid. The fatty acid used as a raw material may have a distribution in the number of carbon atoms of the alkyl group, and the alkyl group may be linear or branched, and may be saturated or unsaturated. . 4-24 are preferable, as for carbon number of an alkyl group, 6-22 are more preferable, 8-20 are more preferable, and 8-18 are especially preferable. If the alkyl group has less than 4 carbon atoms, the card passing property may decrease. On the other hand, if the alkyl group has more than 24 carbon atoms, the instantaneous water permeability may decrease. Specifically, soaps such as potassium oleate, sodium laurate, and potassium coconut fatty acid can be used. In addition, 1 type (s) or 2 or more types may be used for D2a component.

  The sulfate ester salt (D2b component) is octyl sulfate salt, decyl sulfate ester salt, lauryl sulfate ester salt, myristyl sulfate ester salt, cetyl sulfate ester salt, stearyl sulfate ester salt, oleyl sulfate ester salt, icosanyl sulfate ester salt. C8-24 alkyl and / or alkenyl sulfate, polyoxyethylene octylphenyl ether sulfate, polyoxyethylene decylphenyl ether sulfate, polyoxyethylene lauryl phenyl ether sulfate, polyoxyethylene Polyoxyethylene alkylphenyl ether sulfate ester having an alkyl group having 8 to 14 carbon atoms such as myristyl phenyl ether sulfate ester, polyoxyethylene octyl ether sulfate ester Carbon such as sodium salt, polyoxyethylene decyl ether sulfate, polyoxyethylene lauryl ether sulfate, polyoxyethylene myristyl ether sulfate, polyoxyethylene cetyl ether sulfate, polyoxyethylene stearyl ether sulfate Examples thereof include polyoxyethylene alkyl ether sulfates having an alkyl group of 8 to 18, among them alkyl and / or alkenyl sulfates having 8 to 18 carbon atoms, and 1 to 10 oxyethylene units. The (poly) oxyethylene alkyl ether sulfate ester salt is preferred. In addition, 1 type (s) or 2 or more types may be used for D2b component.

  The sulfonate (D2c component) is an alkyl sulfone having 8 to 18 carbon atoms such as octyl sulfonate, decyl sulfonate, lauryl sulfonate, myristyl sulfonate, cetyl sulfonate, and stearyl sulfonate. Examples include acid ester salts, alkylbenzene sulfonic acid ester salts having an alkyl group having 8 to 12 carbon atoms, such as octylbenzene sulfonate and dodecyl benzene sulfonate, among which alkyl sulfonic acid esters having 12 to 18 carbon atoms. Salts and alkylbenzene sulfonic acid ester salts having an alkyl group having 8 to 12 carbon atoms are preferred. In addition, 1 type (s) or 2 or more types may be used for D2c component.

  The dialkyl sulfosuccinate salt (D2d component) is a dialkyl ester of succinic acid having a sulfonate group at the α-position. The number of carbon atoms of the alkyl group constituting the dialkyl ester may be distributed, and the alkyl group may be linear or branched, and may be saturated or unsaturated. 6-22 are preferable, as for carbon number of an alkyl group, 6-18 are more preferable, 8-18 are more preferable, and 8-14 are especially preferable. If the alkyl group has less than 6 carbon atoms, the card passing property may decrease. On the other hand, if the alkyl group has more than 22 carbon atoms, the instantaneous water permeability may decrease.

  Examples of the D2d component include dihexyl sulfosuccinate salt, di-2-ethylhexyl sulfosuccinate salt, dilauryl sulfosuccinate salt, dicoco alkylsulfosuccinate salt, ditridecyl sulfosuccinate salt, dimyristyl sulfosuccinate Salt, distearyl sulfosuccinate salt and the like. These dialkyl sulfosuccinate salts may be used alone or in combination of two or more.

  In the component D described above, examples of the salt constituting it include alkali metal salts such as sodium salt and potassium salt, and alkanolamine salts such as monoethanolamine, diethanolamine and triethanolamine. Salt is preferable, and sodium salt and potassium salt are more preferable. A sodium salt and / or a potassium salt is preferable because the liquid quickly penetrates into the fibers to which the water-permeability imparting agent has adhered.

  D3 component includes quaternary ammonium salt type cationic surfactant (D3a component), imidazolinium type cationic surfactant (D3b component), alkylbetaine surfactant (D3c component), alkylimidazole type betaine surfactant ( D3d component), an amide group-containing betaine surfactant (D3e component), and a higher fatty acid alkanolamide type surfactant (D3f component).

  The quaternary ammonium salt type cationic surfactant (D3a component) is not particularly limited. For example, dioctyldimethylammonium chloride salt, didecyldimethylammonium chloride salt, dilauryldimethylammonium chloride salt, distearyldimethylammonium chloride. Salt, dicoconut alkyldimethylammonium chloride salt, di-cured tallow alkyldimethylammonium chloride salt, behenyltrimethylammonium chloride salt, dilauryldimethylammonium methosulfate salt, dilaurylmethylethylammonium etosulphate salt, distearyldimethylammonium methosulfate salt, Di (oleyloxyethyl) hydroxyethylmethylammonium methosulfate salt, di (stearic acid amide) Chill) hydroxyethyl methyl ammonium methosulfate salts. Of these, dilauryl dimethyl ammonium chloride salt, distearyl dimethyl ammonium chloride salt, and di-cured tallow alkyl dimethyl ammonium chloride salt are preferable. In addition, 1 type (s) or 2 or more types may be used for D3a component.

  The imidazolinium type cationic surfactant (D3b component) is not particularly limited, but the 2-position substituent of the imidazolinium ring is an aliphatic hydrocarbon group having 11 to 21 carbon atoms, and the anionic group is methyl. Preferred is an ionic residue selected from the group consisting of sulfate ion, ethyl sulfate ion and dimethyl phosphate ion. Examples of the imidazolinium type cationic surfactant include 1-hydroxyethyl-1-ethyl-2-laurylimidazolinium ethyl sulfate salt, 1-hydroxyethyl-1-ethyl-2-oleyl imidazolinium ethyl sulfate salt, and the like. 1-hydroxyethyl-1-ethyl-2-stearylimidazolinium ethyl sulfate salt, 1-hydroxyethyl-1-methyl-2-tetradecylimidazolinium methyl sulfate salt, 1-hydroxyethyl-1-methyl-2 -Lauryl imidazolinium methyl sulfate salt, 1-hydroxyethyl-1-methyl-2-oleyl imidazolinium methyl sulfate salt, 1-hydroxyethyl-1-methyl-2-stearyl imidazolinium methyl sulfate salt, 1-hydroxy Ethyl l-methyl-2-oleyl imidazolinium dimethyl phosphate salts. Among these, 1-hydroxyethyl-1-ethyl-2-oleylimidazolinium ethyl sulfate salt is preferable. In addition, 1 type (s) or 2 or more types may be used for D3b component.

  The alkylbetaine surfactant (D3c component) is not particularly limited, and examples thereof include lauryldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, lauryldimethylaminosulfopropylbetaine, and lauryldimethylhydroxysulfobetaine. Among these, stearyldimethylaminoacetic acid betaine is preferable. In addition, 1 type (s) or 2 or more types may be used for a D3c component.

  The alkylimidazole-type betaine surfactant (D3d component) is not particularly limited. For example, 2-lauryl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, 2-oleyl-N-carboxymethyl-N- And hydroxyethyl imidazolinium betaine. Among these, 2-lauryl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine is preferable. In addition, 1 type (s) or 2 or more types may be used for D3d component.

  The amide group-containing betaine surfactant (D3e component) is not particularly limited. Examples thereof include lauric acid amidopropyldimethylaminoacetic acid betaine, oleic acid amidopropyldimethylaminoacetic acid betaine, and stearic acid amidopropyldimethylaminoacetic acid betaine. Among these, betaine stearate amidopropyldimethylaminoacetate is preferable. In addition, 1 type (s) or 2 or more types may be used for D3e component.

  The higher fatty acid alkanolamide type surfactant (D3f component) is not particularly limited, and examples thereof include lauric acid diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide, behenic acid diethanolamide, lauric acid monoethanolamide, and lauric acid. And monoisopropanolamide. Further, the higher fatty acid alkanolamide type surfactant may also contain an alkylene oxide adduct having 2 to 4 carbon atoms. Among these, stearic acid diethanolamide and behenic acid diethanolamide are preferable. In addition, 1 type (s) or 2 or more types may be used for a D3f component.

(Water permeability imparting agent)
As described above, the weight ratio of each essential component in the water-permeability imparting agent of the present invention is 10 to 45% by weight of the A component and 5% by weight of the B component in the entire nonvolatile content of the water-permeability imparting agent. -40% by weight and the weight ratio of the C component is 10-50% by weight. In order to solve this problem, the total weight ratio of the A component, the B component and the C component is 50-95% by weight. It is necessary to be 55 to 90% by weight, more preferably 60 to 85% by weight, and particularly preferably 65 to 80% by weight. When the total weight ratio of the A component, the B component, and the C component is less than 50% by weight, the durable water permeability, card passing property and thermal adhesiveness are lowered.

The water-permeability imparting agent of the present invention may contain water and / or a solvent as necessary, and preferably contains water essentially. 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. 10-50 weight% is preferable and, as for the weight ratio of the non volatile matter in the whole water-permeability imparting agent at the time of manufacturing a water-permeability imparting agent, 20-40 weight% is especially preferable.
In addition, the water-permeability imparting agent of the present invention, if necessary, surfactants other than the components described above, antibacterial agents, antioxidants, antiseptics, matting agents, pigments, rust preventives, fragrances, An antifoaming agent or the like may further be included.

  The water-permeability imparting agent of the present invention is suitably used for synthetic fibers for producing nonwoven fabrics described later.

  As a method for producing the water-permeability imparting agent of the present invention, a known method can be employed. For example, A component and B component are mixed and stirred at a temperature of about 70 ° C. Next, an aqueous solution of component C is blended and stirred uniformly at a temperature of about 70 ° C. Next, if necessary, the component D is mixed and stirred uniformly at a temperature of about 70 ° C. Next, when a predetermined amount of water is poured and diluted with stirring, 10 to 50% by weight of a water permeability imparting agent can be obtained.

[Water-permeable fiber]
The water-permeable fiber of the present invention is a water-permeable fiber composed of a synthetic fiber for producing nonwoven fabric (fiber body) and the water-permeability imparting agent attached thereto, and is generally a short fiber cut to a predetermined length. Fiber. The adhesion rate of the non-volatile content of the water permeability imparting agent is 0.1 to 2% by weight, preferably 0.3 to 1% by weight, based on the water permeable fiber. When the adhesion rate of the nonvolatile content of the water permeability imparting agent to the water permeable fiber is less than 0.1% by weight, the instantaneous water permeability and the durable water permeability may be lowered. On the other hand, when the adhesion rate of the non-volatile content of the water permeability imparting agent exceeds 2% by weight, the wrapping increases when the fiber is carded, resulting in a significant reduction in productivity, and a nonwoven fabric obtained by a method such as a dry method. Such a fiber product may become sticky after water permeation.

  Synthetic fibers for producing nonwoven fabrics include, for example, polyolefin fibers, polyester fibers, nylon fibers, polyvinyl chloride fibers, composite fibers composed of two or more types of thermoplastic resins, and combinations of composite fibers include polyolefin resins / In the case of polyolefin resin, for example, high density polyethylene / polypropylene, linear high density polyethylene / polypropylene, low density polyethylene / polypropylene, binary copolymer or terpolymer of propylene and other α-olefins / Examples thereof include polypropylene, linear high-density polyethylene / high-density polyethylene, and low-density polyethylene / high-density polyethylene. In the case of polyolefin resin / polyester resin, for example, polypropylene / polyethylene terephthalate, high-density polyethylene / polyethylene terephthalate, linear high-density polyethylene / polyethylene terephthalate, and low-density polyethylene / polyethylene terephthalate. Moreover, in the case of polyester-type resin / polyester-type resin, copolymer polyester / polyethylene terephthalate etc. are mentioned, for example. Furthermore, the fiber which consists of polyamide-type resin / polyester-type resin, polyolefin-type resin / polyamide-type resin etc. can be illustrated. Among these fiber bodies, the water-permeability imparting agent of the present invention is suitable for polyolefin fibers for producing nonwoven fabrics because the attached water-permeability imparting agent is difficult to fall off by liquids such as urine and body fluids.

  Examples of the cross-sectional structure of the fiber include a sheath-core type, a parallel-type, an eccentric sheath-core type, a multilayer type, a radiation type, and a sea-island type. However, because of the productivity in the fiber manufacturing process and the ease of nonwoven fabric processing, the sheath includes eccentricity. A core type or a parallel type is preferred. The cross-sectional shape can be a circular shape or an irregular shape. In the case of an irregular shape, for example, a flat shape, a polygonal shape such as a triangle to an octagon, a T shape, a hollow shape, a multileaf shape, and the like can be used.

  The water-permeability imparting agent of the present invention may be adhered to the fiber body without being diluted as it is, and diluted with water or the like to a concentration such that the weight ratio of the entire nonvolatile content becomes 0.5 to 15% by weight as an emulsion. You may make it adhere to a fiber main body. The step of attaching the water permeability imparting agent to the fiber body may be any of a spinning process, a stretching process, a crimping process, and the like of the fiber body. The means for attaching the water permeability imparting agent of the present invention to the fiber body is not particularly limited, and means such as roller lubrication, nozzle spray lubrication, and dip lubrication may be used. A method for obtaining a desired adhesion rate more uniformly and efficiently may be employed in accordance with the production process of the fiber and its characteristics. Moreover, as a drying method, you may use the method of drying with a hot air and infrared rays, the method of making it contact with a heat source, and drying.

  The water-permeable fiber of the present invention is excellent in durable water permeability. In the durable water permeability evaluation of the water permeable fiber, the disappearance time of the physiological saline is measured at 20 places in the third evaluation, and the number of places where the disappearance time is less than 5 seconds is usually 10 or more, preferably 12 Or more, more preferably 14 or more, more preferably 16 or more, and particularly preferably 18 or more.

[Method for producing nonwoven fabric]
There is no restriction | limiting in particular as a manufacturing method of a nonwoven fabric, A well-known method is employable. Short fibers or long fibers can be used as the raw fiber. Examples of the web forming method in which the raw fibers are short fibers include a dry method such as a card method and an airlaid method, and a wet method such as a papermaking method. Examples of the web forming method in which the raw fibers are long fibers include a spunbond method, a melt blow method, and a flash spinning method. Examples of the interfiber bonding method include a chemical bond method, a thermal bond method, a needle punch method, a spunlace method, and a stitch bond method.

The method for producing a nonwoven fabric of the present invention preferably includes a step of producing a fiber web by passing the water permeable fibers (for example, short fibers) of the present invention through a card machine or the like and thermally bonding the obtained fiber web. That is, the water-permeability imparting agent of the present invention is particularly preferably used when it has a step of thermally bonding a fiber web in the production of a nonwoven fabric.
Examples of the method for thermally bonding the fiber web include heat fusion methods such as thermocompression bonding using a heated roll or ultrasonic waves, heat fusion using heated air, and a thermocompression bonding (point bonding) method. As an example of thermally bonding the fiber web, in the case of a sheath-core type composite fiber using a high melting point resin for the core and a low melting point resin for the sheath, by heat treatment near the melting point of the low melting point resin, Heat bonding at the fiber intersection can be easily performed.

  As a method for producing a nonwoven fabric including a step of thermally bonding, a method in which a short fiber to which a water-permeability imparting agent is applied is made into a web by passing it through a card machine or the like is thermally bonded as described above, and an airlaid method is used. A method of blending with the water-permeable fibers (short fibers) of the present invention when laminating pulp or the like and thermally bonding them as described above is also included. In addition, the fiber molded body obtained by the spunbond method, the melt blow method, the flash spinning method, etc., and the one to which the water-permeability imparting agent of the present invention is adhered is thermally bonded with a heating roll or heated air, or A method for producing a nonwoven fabric by attaching the water permeability imparting agent of the present invention to a material heat treated with a heated roll or heated air is also mentioned.

As an example of the spunbond method, a composite fiber resin is spun, then the spun composite long fiber filament is cooled with a cooling fluid, and tension is applied to the filament with drawn air to obtain the desired fineness. Thereafter, the spun filament is collected on a collection belt and subjected to a bonding treatment to obtain a spunbonded nonwoven fabric. Examples of the joining means include thermocompression bonding using a heating roll or ultrasonic waves, heat fusion using heated air, and a thermocompression bonding (point bonding) method.
As a method for imparting the water permeability imparting agent of the present invention to the obtained spunbond nonwoven fabric, it can be performed by a gravure method, a flexo method, a roll coating method such as a gate roll method, a spray coating method, etc. There is no particular limitation as long as the coating amount can be adjusted for each side. Moreover, as a drying method, you may use the method of drying with a hot air and infrared rays, the method of making it contact with a heat source, and drying.

  The present invention will be described below with reference to examples, but the present invention is not limited thereto. In addition, the evaluation items and the evaluation method in each example and comparative example are as follows.

(Examples 1-18 and Comparative Examples 1-10)
The numerical value in Tables 1-3 is a weight ratio of each component which occupies for the non volatile matter of Examples 1-18 and Comparative Examples 1-10.
First, each component shown in Tables 1 to 3 and water were mixed, and the water permeability imparting agents of Examples 1 to 18 and Comparative Examples 1 to 10 in which the weight ratio of the nonvolatile content in the entire water permeability imparting agent was 25% by weight. Were prepared respectively. The obtained water-permeability imparting agent was diluted with warm water of about 60 ° C. so that the weight ratio of nonvolatile content was 0.8% by weight to obtain a diluted solution.
Next, with respect to 3000 g of fiber main bodies, 1500 g of the diluted solution of each water-permeability imparting agent was adhered by spraying, so that the non-volatile content adhesion rate of the water-permeability imparting agent adhered to the water-permeable fiber was 0.4% by weight. The fiber body is a polyethylene terephthalate (core) -polyethylene (sheath) based composite fiber to which a fiber treatment agent such as a water permeability imparting agent is not attached, and has a single fiber fineness of 1.6 Dtex and a fiber length of 51 mm. there were. The fibers to which the respective liquid permeability imparting agents were attached were placed in a 60 ° C. hot air dryer for 2 hours and then allowed to dry at room temperature for 8 hours or more to obtain water permeable fibers. .

Next, the obtained water-permeable fibers were respectively passed through a blended cotton process and a card process using a card testing machine to prepare a web having a basis weight of 30 g / m ² . At that time, for each water-permeable fiber, physical properties in the card process (card passing property: cylinder winding, presence / absence of scum, and number of neps) were evaluated by the following evaluation method. The obtained web was heat-treated at 130 ° C. in an air-through hot air circulating dryer to fix the web to obtain a nonwoven fabric. About the obtained nonwoven fabric, the physical property (instant water permeability, durable water permeability, and nonwoven fabric strength) was evaluated by the evaluation method shown below. The results are shown in Tables 4-6.

〔Evaluation method〕
(1)
Cylinder winding The card | curd was observed after carding the sample short fiber 40g on 30 degreeC x 80% RH conditions using the card test machine, and the following references | standards evaluated. Note that 5 is the best evaluation.
5 ... No winding, 4 ... winding to 1/10 of the cylinder surface, 3 ... winding to 1/5 of the cylinder surface, 2 ... winding to 1/3 of the cylinder surface, 1 ... winding to the entire surface With

(2) Presence or absence of scum The scum adhering to the roller was observed by carding 2000 g of the sample short fiber under the condition of 30 ° C. × 80% RH using a card testing machine, and the presence or absence of scum was evaluated.

(3) Number of Neps Using a card tester, the web was observed after carding 40 g of sample short fibers under the condition of 25 ° C. × 65% RH, and the number of generated neps was counted. Nep number 0 is the most excellent.

(4) Instantaneous water permeability of non-woven fabric The non-woven fabric is layered on a filter paper (Toyo Roshi, No. 5), and 1 drop (about 0.05 ml) of physiological saline is added from a burette placed at a height of 10 mm from the non-woven fabric surface. It is dripped and the time until water droplets disappear from the nonwoven fabric surface is measured. This measurement is performed at 20 points on the surface of the nonwoven fabric, and the number of less than 5 seconds is displayed.

(5) Durable water permeability of nonwoven fabric A nonwoven fabric (10 cm × 10 cm) was placed on a commercially available paper diaper, a cylinder with an inner diameter of 60 mm was placed thereon, 80 ml of physiological saline was injected into the cylinder, and the nonwoven fabric was absorbed through the nonwoven fabric. After leaving for 3 minutes after water injection, the nonwoven fabric is sandwiched between two filter papers (Toyo filter paper, No. 5), and a plate (10 cm × 10 cm) and weight (total 3.5 kg) are placed on it for 3 minutes. And dehydrated, then air dried for another 5 minutes. About the location where physiological saline passed through the sample nonwoven fabric after air drying in the cylinder, the disappearance time of physiological saline was measured at 20 locations by the instantaneous water permeability test method of the nonwoven fabric, and the number of disappearance time less than 5 seconds was determined. displayed.
The same operation is repeated for the nonwoven fabric subjected to the test. In this repeated test, it is better that the number of disappearances of physiological saline (the number of places where the disappearance time is less than 5 seconds) is large even if the number of times is repeated.

(6) Nonwoven fabric strength Gripping interval of tensile stress test machine (TG-2kN, manufactured by Minebea Co., Ltd.) stress applied when the nonwoven fabric (width 2.5 cm, length 11.5 cm) web is stretched by 20% in the length direction. The stress [cN / cm] applied per 1 cm of the nonwoven fabric was calculated by measuring at 7.5 cm. This value should just be 45 cN / cm or more. However, the direction parallel to the direction in which the short fibers are aligned is the length direction of the web, and the direction perpendicular to the width direction is the width direction.

(7) Adhesion rate of water-permeability imparting agent adhering to water-permeable fiber The adhering rate of the non-volatile content of the water-permeability imparting agent adhering to the water-permeable fiber was water permeability adjusted for 24 hours at a temperature and humidity of 25 ° C x 40% RH The neutral fiber (W1) was extracted with a rapid residual oil extractor R-11 type (manufactured by Tokai Keiki Co., Ltd.) using methanol, and the adhesion rate (W2) of the nonvolatile content of the water permeability imparting agent was determined. And the adhesion rate C% of the non volatile matter of the water-permeability | providing agent was calculated | required from the following formula.
C = W2 / W1 × 100 (%)

Component A1: Maleic acid condensate of polyoxyethylene (20 mol) hardened castor oil (hydroxyl unblocked)
Component A2: Ester blocked with 0.5 mole equivalent of stearic acid per mole equivalent of hydroxyl group of maleic acid condensate of polyoxyethylene (20 mole) hardened castor oil Component A3: Maleic acid condensation of polyoxyethylene (20 mole) hardened castor oil Ester blocked with 1 molar equivalent of behenic acid per 1 molar equivalent of hydroxyl group

Component B1: Isooctyl palmitate Component B2: Isotridecyl stearate Component B3: Dioleyl adipate Component B4: Mineral oil (60 seconds, Redwood viscometer, 40 ° C.)
Component B5: Dioleylthiodipropionate

Component C1: Octyl phosphate potassium salt Component C2: Lauryl phosphate potassium salt Component C3: Polyoxyethylene (3 mol) cetyl phosphate potassium salt

Component D1a1: Polyoxyethylene (9 mol) secondary tridecyl ether component D1b1: Polyoxyethylene-modified silicone (Si element content: 65%, molecular weight: 10,000).

Component D2a1: Lauric acid potassium salt Component D2c1: Cetylsulfonate sodium salt Component D2d1: Dioctylsulfosuccinate sodium salt

Component D3a1: Di (cured tallow alkyl) dimethylammonium chloride salt Component D3c1: Stearyldimethylaminoacetic acid betaine component D3f1: Stearic acid diethanolamide

Component B6: Polyoxyethylene (20 mol) sorbitan trioleate Component C4: Stearyl phosphate potassium salt Component D1a2: Polyoxyethylene (100 mol) stearyl ether component D2b1: Polyoxyethylene (3 mol) lauryl ether sulfate sodium salt

  As is apparent from Tables 4 and 5, the water-permeable fibers supplied with the water-permeability imparting agents of Examples 1 to 18 of the present invention are card passability, instantaneous water permeability of water-permeable nonwoven fabric, durable water permeability, and thermal bonding. The property was good. If this water-permeability imparting agent was added, the fiber was given instant water permeability and durable water permeability, and the effects of the present invention were confirmed. On the other hand, as is clear from Table 6, Comparative Examples 1 to 10 that deviate from these component composition ranges could not satisfy all necessary characteristics.

Claims (8)

A water permeability imparting agent comprising A component, B component and C component as essential components,
The component A is a condensate of a polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester and a dicarboxylic acid (or dicarboxylic acid derivative) and / or an ester obtained by blocking at least one hydroxyl group of the condensate with a fatty acid. ,
The component B is an ester and / or mineral oil obtained from at least one selected from monohydric alcohols, polyhydric alcohols, and alkylene oxide adducts thereof, and aliphatic carboxylic acids and / or thiodicarboxylic acids,
The component C is an alkyl phosphate salt having an alkyl group having 6 to 22 carbon atoms and / or a polyoxyalkylene group-containing alkyl phosphate salt;
The weight ratio of the A component in the entire nonvolatile content of the water permeability imparting agent is 10 to 45% by weight, the weight ratio of the B component is 5 to 40% by weight, the weight ratio of the C component is 10 to 50% by weight, and A water permeability imparting agent, wherein the total weight ratio of the A component, the B component and the C component is 50% by weight or more.   The polyoxyalkylene group-containing hydroxy fatty acid polyhydric alcohol ester of component A is an alkylene oxide adduct of an ester of a hydroxy fatty acid having 6 to 22 carbon atoms and a polyhydric alcohol, and the carbon number of the dicarboxylic acid is 2 to 10 The water-permeability imparting agent according to claim 1, wherein the fatty acid has 10 to 50 carbon atoms. The ester of the component B is an ester obtained from a monohydric alcohol and / or a polyhydric alcohol and an aliphatic carboxylic acid and / or a thiodicarboxylic acid,
The water permeability imparting agent according to claim 1 or 2, wherein the mineral oil of component B is at least one selected from machine oil, spindle oil, and liquid paraffin. The water-permeability imparting agent according to any one of claims 1 to 3, wherein the C component is a compound represented by the following general formula (1).

(In the formula, R ¹ is an alkyl group having 6 to 22 carbon atoms, AO is an oxyalkylene group having 2 to 4 carbon atoms, m is an integer of 0 to 15, and n is an integer of 1 to 2). Y ⁺ is an ionic residue selected from the group consisting of hydrogen ions, alkali metal ions, ammonium ions, and primary to tertiary ammonium ions.) The composition further comprises at least one D component selected from the following D1 component, D2 component and D3 component, and the weight ratio of the D component in the entire nonvolatile content of the water-permeability imparting agent is 5 to 50% by weight. Item 5. The water permeability imparting agent according to any one of Items 1 to 4.
D1 component: propylene oxide (hereinafter abbreviated as PO) / ethylene oxide (hereinafter abbreviated as EO) adduct and / or polyoxyalkylene-modified silicone of monohydric aliphatic alcohol having 4 to 24 carbon atoms D2 component: carboxylate, sulfonic acid At least one selected from salts, sulfosuccinates and sulfate esters D3 component: quaternary ammonium salt type cationic surfactant, imidazolinium type cationic surfactant, alkylbetaine surfactant, alkylimidazole type betaine surfactant Agent, at least one selected from amide group-containing betaine surfactants and higher fatty acid alkanolamide surfactants   The water permeability imparting agent according to any one of claims 1 to 5, which is used for a hydrophobic synthetic fiber for producing a nonwoven fabric.   The water-permeable fiber by which the water-permeability imparting agent in any one of Claims 1-6 was processed with respect to the hydrophobic synthetic fiber for nonwoven fabric manufacture.   The manufacturing method of a nonwoven fabric including the process of accumulating the water-permeable fiber of Claim 7, producing a fiber web, and heat-bonding the obtained fiber web.