JP7252684B1 - Processing agent for viscose rayon, viscose rayon, viscose rayon staple fiber, and method for producing spunlace nonwoven fabric - Google Patents

Abstract

A treatment agent for viscose rayon, etc., capable of improving the effect of reducing foaming caused by water used for hydroentangling and reducing the occurrence of cotton odor. A viscose rayon treatment agent contains at least one selected from the following fatty acid derivatives, fatty acids and oils and fats, and an antioxidant. Fatty acid derivative: A compound obtained by adding 1 mol or more and 30 mol or less of ethylene oxide to 1 mol of a fatty acid having 12 or more and 24 or less carbon atoms, and 1 mol of a compound obtained by polymerizing 4 mol or more and 50 mol or less of ethylene glycol, and carbon. at least one selected from an ester compound with 1 mol or more and 2 mol or less of a fatty acid having a number of 12 or more and 24 or less; Fatty acid: A fatty acid having 12 to 24 carbon atoms. Fats and oils: At least one selected from vegetable oils, animal oils, and hardened oils thereof. [Selection figure] None

Description

TECHNICAL FIELD The present invention relates to a viscose rayon treatment agent, viscose rayon to which the viscose rayon treatment agent is attached, short fibers of the same viscose rayon, and a method for producing a spunlace nonwoven fabric.

Natural fibers such as cotton fibers, regenerated fibers such as rayon, and synthetic resins such as polyolefins are known as raw materials used for nonwoven fabrics. Among them, viscose rayon, which is a regenerated fiber made from pulp, cotton linter, or the like, is attracting attention from the viewpoint of excellent biodegradability, hygroscopicity, and water absorption.

In the production of nonwoven fabrics, in order to impart various properties such as lubricity and bundling properties, the surface of the raw material fibers may be treated with a nonwoven fabric treatment agent containing a surfactant or the like. . Patent Literature 1 discloses a treatment agent for spunlace fibers that is attached to raw fibers such as viscose rayon when producing a spunlace nonwoven fabric. This spunlace fiber treatment agent contains a polyoxyalkylene derivative and a function imparting agent.

Japanese Patent No. 6132966

However, this conventional treatment agent for spunlace fibers is capable of both reducing foaming caused by the water used for hydroentangling in the nonwoven fabric manufacturing process and reducing the odor of raw fibers to which the treatment agent for spunlace fibers is attached. Insufficient is a problem.

As a result of research aimed at solving the above-mentioned problems, the present inventors found that a viscose rayon treatment agent containing three specific ingredients is just right.
Embodiments of a viscose rayon treatment that solves the above problems are described.

The viscose rayon treatment agent of aspect 1 contains the following fatty acid derivative, at least one selected from the following fatty acids and oils and fats, and an antioxidant, and the antioxidant in the viscose rayon treatment agent The gist is that the content is 0.1% by mass or more and 10% by mass or less . Fatty acid derivative: A compound obtained by adding 1 mol or more and 30 mol or less of ethylene oxide to 1 mol of a fatty acid having 12 or more and 24 or less carbon atoms, and 1 mol of a compound obtained by polymerizing 4 mol or more and 50 mol or less of ethylene glycol and carbon. at least one selected from an ester compound with 1 mol or more and 2 mol or less of a fatty acid having a number of 12 or more and 24 or less; Fatty acid: A fatty acid having 12 to 24 carbon atoms. Fats and oils: At least one selected from vegetable oils, animal oils, and hardened oils thereof.

The treating agent for viscose rayon of aspect 2 is the treating agent for viscose rayon according to aspect 1, wherein the total content of at least one selected from the fatty acid derivative, the fatty acid and the fat and oil, and the antioxidant is 100 parts by mass, the fatty acid derivative is 80 parts by mass or more and 99.89 parts by mass or less, at least one selected from the fatty acid and the fat is 0.01 part by mass or more and 10 parts by mass or less, and the antioxidant should be contained at a ratio of 0.1 parts by mass or more and 10 parts by mass or less.

The treatment agent for viscose rayon of aspect 3 preferably contains at least one selected from the following lubricants and anionic surfactants in the treatment agent for viscose rayon of aspect 1. Lubricant: at least one selected from hydrocarbon compounds, ester compounds (excluding the above oils and fats and the above fatty acid derivatives), and silicones.

The viscose rayon treatment agent of aspect 4 is the viscose rayon treatment agent of aspect 3, wherein at least one selected from the fatty acid derivative, the fatty acid and the fat and oil, the antioxidant, and the lubricant are added. When the total content of the fatty acid derivative, at least one selected from the fatty acid and the fat, the antioxidant, and the lubricant is 100 parts by mass, the fatty acid derivative is 60 parts by mass or more 98.89 0.01 to 10 parts by mass of at least one selected from the fatty acid and the fat, 0.1 to 10 parts by mass of the antioxidant, and 1 part by mass of the lubricant part or more and 20 parts by mass or less.

The viscose rayon treatment agent of aspect 5 is the viscose rayon treatment agent of aspect 3, wherein at least one selected from the fatty acid derivative, the fatty acid and the fat and oil, the antioxidant, and the anionic surfactant When the total content of at least one selected from the fatty acid derivative, the fatty acid and the fat, the antioxidant, and the anionic surfactant is 100 parts by mass, 60 parts by mass of the fatty acid derivative 98.89 parts by mass or less, 0.01 parts by mass or more and 10 parts by mass or less of at least one selected from the fatty acids and the fats and oils, 0.1 parts by mass or more and 10 parts by mass or less of the antioxidant, and the anion It is preferable to contain the surfactant at a ratio of 1 part by mass or more and 20 parts by mass or less.

The viscose rayon treatment agent of aspect 6 is the viscose rayon treatment agent of aspect 3, wherein at least one selected from the fatty acid derivative, the fatty acid and the fat and oil, the antioxidant, the lubricant, and When the total content of at least one selected from the fatty acid derivative, the fatty acid and the oil, the antioxidant, the lubricant, and the anionic surfactant containing the anionic surfactant is 100 parts by mass , 40 to 97.89 parts by mass of the fatty acid derivative, 0.01 to 10 parts by mass of at least one selected from the fatty acid and the fat, and 0.1 to 10 parts by mass of the antioxidant It is preferable to contain 1 part by mass or more and 20 parts by mass or less of the lubricant, and 1 part by mass or more and 20 parts by mass or less of the anionic surfactant.

Aspect 7 of the treating agent for viscose rayon is preferably the treating agent for viscose rayon according to any one of aspects 1 to 6, wherein the viscose rayon is short viscose rayon fibers.

Embodiments of viscose rayon that solve the above problems are described.
The gist of the viscose rayon of aspect 8 is that the treatment agent for viscose rayon according to any one of aspects 1 to 7 is adhered.

The gist of the viscose rayon short fibers of aspect 9 is that the treating agent for viscose rayon according to any one of aspects 1 to 7 is adhered.
Embodiments of a method for making spunlaced nonwoven fabrics that solve the above problems are described.

The gist of the method for producing a spunlaced nonwoven fabric of aspect 10 is to include the following steps 1 and 2. Step 1: A step of carding the viscose rayon short fibers of aspect 9 to produce a web. Step 2: A step of entangling the web obtained in Step 1 with a water stream.

ADVANTAGE OF THE INVENTION According to this invention, the reduction effect of the water used for hydroentangling can be improved, and the cotton odor of viscose rayon can be reduced.

(First embodiment)
A first embodiment of the viscose rayon treatment agent (hereinafter referred to as "treatment agent") of the present invention will be described below. The treatment agent contains at least one selected from the fatty acid derivatives described below, fatty acids and fats described below, and an antioxidant. The fatty acid derivative is a compound obtained by adding 1 mol or more and 30 mol or less of ethylene oxide to 1 mol of a fatty acid having 12 or more and 24 or less carbon atoms, and 1 mol of a compound obtained by polymerizing 4 mol or more and 50 mol or less of ethylene glycol. It is at least one selected from an ester compound with 1 mol or more and 2 mol or less of a fatty acid having 12 or more and 24 or less carbon atoms. A fatty acid is a fatty acid having 12 or more and 24 or less carbon atoms. Fats and oils are at least one selected from vegetable oils, animal oils, and hardened oils thereof. Furthermore, it may contain a lubricant and/or an anionic surfactant, if desired.

<About fatty acid derivative (A)>
The fatty acid derivative (A) used in the treatment agent of the present embodiment is a compound obtained by adding ethylene oxide at a ratio of 1 mol or more and 30 mol or less to 1 mol of a fatty acid having 12 or more and 24 or less carbon atoms, and 4 mol of ethylene glycol. It is at least one compound selected from 1 mol or more of a polymerized compound of 50 mol or less and an ester compound of 1 mol or more and 2 mol or less of a fatty acid having 12 or more and 24 or less carbon atoms.

As the fatty acid used as a raw material for the fatty acid derivative (A), a known fatty acid can be appropriately employed, and it may be a saturated fatty acid or an unsaturated fatty acid. Moreover, it may be linear or may have a branched chain structure. The number of carbon atoms in the fatty acid is 12 or more and 24 or less, preferably 12 or more and 22 or less. Ranges with any combination of the above upper and lower limits are also envisioned.

The added mole number of ethylene oxide is 1 to 30 mol, preferably 2 to 25 mol. Ranges with any combination of the above upper and lower limits are also envisioned. The number of moles of ethylene oxide added indicates the number of moles of ethylene oxide per 1 mole of the raw material fatty acid.

Specific examples of the fatty acid derivative (A) include (1) a compound obtained by adding 20 mol of ethylene oxide to 1 mol of oleic acid, a compound obtained by adding 10 mol of ethylene oxide to 1 mol of oleic acid, and 1 mol of oleic acid. A compound obtained by adding 30 moles of ethylene oxide per mole, a compound obtained by adding 5 moles of ethylene oxide to 1 mole of stearic acid, a compound obtained by adding 10 moles of ethylene oxide to 1 mole of stearic acid, and 1 mole of lauric acid. On the other hand, polyoxyethylene alkyl (or alkylene) ester obtained by adding ethylene oxide to a saturated or unsaturated fatty acid such as a compound to which 10 mol of ethylene oxide is added, (2) Compound 1 obtained by polymerizing 9 mol of ethylene glycol mol and 1 mol of oleic acid, an ester compound of 1 mol of a compound obtained by polymerizing 14 mol of ethylene glycol and 2 mol of oleic acid, and a mixture of 1 mol of a compound obtained by polymerizing 23 mol of ethylene glycol and 1 mol of stearic acid Saturated or unsaturated ester compounds such as ester compounds, ester compounds of 1 mol of a compound obtained by polymerizing 9 mol of ethylene glycol and 2 mol of lauric acid, and ester compounds of 1 mol of a compound obtained by polymerizing 23 mol of ethylene glycol and 2 mol of stearic acid. polyethylene glycol alkyl (or alkylene) ester obtained by addition reaction of polyethylene glycol to fatty acid; (3) compound obtained by adding 30 mol of ethylene oxide to 1 mol of castor oil; Polyoxyethylene fat-derived fatty acid esters obtained by addition reaction of ethylene oxide to naturally occurring fatty acids, such as a compound obtained by adding 10 moles of ethylene oxide to 1 mole of coconut fatty acid, and the like. .

As the fatty acid derivative (A), one fatty acid derivative may be used alone, or two or more fatty acid derivatives may be used in combination.
The lower limit of the content of the fatty acid derivative (A) in the treatment agent is preferably 30% by mass or more, more preferably 40% by mass or more. Moreover, the upper limit of the content of the fatty acid derivative (A) is preferably 95% by mass or less, more preferably 92% by mass or less. The effect of the present invention can be further improved by defining the range of the content ratio. Ranges in which the above upper and lower limits are arbitrarily combined are also envisioned.

<About fatty acid (B1) and fat (B2)>
The fatty acid (B1) used in the treatment agent of the present embodiment is a fatty acid having 12 or more and 24 or less carbon atoms. Known fatty acids having 12 to 24 carbon atoms can be used as appropriate. It may be a saturated fatty acid or an unsaturated fatty acid. Moreover, it may be linear or may have a branched chain structure. The number of carbon atoms in the fatty acid (B1) is 12 or more and 24 or less, preferably 12 or more and 22 or less. Ranges with any combination of the above upper and lower limits are also envisioned. Specific examples of the fatty acid (B1) include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachidic acid, behenic acid, lignoceric acid, and coconut fatty acid.

The oil (B2) to be treated with the treatment agent of the present embodiment is at least one selected from vegetable oils, animal oils, and hardened oils thereof. Specific examples of fats and oils (B2) include castor oil, sesame oil, tall oil, palm oil, palm kernel oil, coconut oil, rapeseed oil, lard, beef tallow, whale oil, and hardened oils thereof such as hardened castor oil, palm hardened oil and the like.

As the fatty acid (B1) and the fat (B2), one type of fatty acid and/or fat may be used alone, or two or more types of fatty acid and/or fat may be used in combination.
In the treatment agent, the lower limit of the content of at least one selected from fatty acid (B1) and fat (B2) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more. By setting the content within such a range, the effect of reducing the falling foam can be further improved. Also, the upper limit of the content of such components is preferably 15% by mass or less, more preferably 10% by mass or less. By setting the content within such a range, the emulsion stability can be further improved. Ranges in which the above upper and lower limits are arbitrarily combined are also envisioned.

<About antioxidant (C)>
As the antioxidant (C) to be used in the processing agent of the present embodiment, a known one can be appropriately employed. Specific examples of the antioxidant (C) include (1) 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4 ,6-(1H,3H,5H)-trione, 1,3,5-tris(3′,5′-di-t-butyl-4-hydroxybenzyl)isocyanuric acid, 1,3,5-tris(4 -t-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanuric acid, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl) Benzene, 2,2'-methylene-bis(4-methyl-6-t-butylphenol), 1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane, pentaerythritol = tetrakis Phenolic antioxidants such as [3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)propionate], (2) 4,4′-thiobis-(6-t-butyl-3) -methylphenol), dilauryl-3,3′-thiodipropionate, 2,2-bis({[3-(dodecylthio)propionyl]oxy}methyl)-1,3-propanediyl=bis[3-(dodecylthio ) propionate], ditridecan-1-yl=3,3′-sulfanediyl dipropanoate and other thioether antioxidants, (3) 3,9-bis(2,6-di-t-butyl-4- methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, tris(mixed, mono and dinonylphenyl)phosphite, tris(2,3-di-t- butylphenyl) phosphite, 4,4′-butylidene-bis(3-methyl-6-t-butylphenyl-di-tridecyl) phosphite, 1,1,3-tris(2-methyl-4-di-tri Decylphosphite-5-t-butylphenyl)butane, tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-t-butylphenyl)pentaerythritol-di-phosphite, tetrakis(2,4-di-t-butylphenyl)-4,4'-biphenylenephosphanite, bis(2,6-di-t-butyl-4-methylphenyl)pentaerythritol-di-phosphite, Tetrakis(2,4-di-t-butylphenyl)4,4'-biphenylenediphosphonite, Tetratridecyl-4,4'-butylidene-bis-(2-t-butyl-5-methylphenol) diphosphite , triphenylphosphite, diphenyldecylphosphite, tridecylphosphite, trioctylphosphite, tridodecylphosphite, trioctadecylphosphite, trinonylphenylphosphite, tridodecyltrithiophosphite, octyldiphenylphosphite, etc. system antioxidants and the like.

As the antioxidant (C), one kind of antioxidant may be used alone, or two or more kinds of antioxidants may be used in combination. When using one antioxidant alone, it is preferable to use a phenolic antioxidant or a thioether antioxidant. In the case of such a configuration, the effect of the present invention, particularly the effect of reducing cotton odor, can be further improved. When two or more antioxidants are used in combination, it is preferable to use a phenol-based antioxidant and a thioether-based antioxidant in combination. In the case of such a configuration, the effect of reducing cotton odor can be further improved.

In the treatment agent of the present embodiment, the content ratio of the above-described fatty acid derivative (A), at least one selected from the fatty acid (B1) and the oil (B2), and the antioxidant (C) is particularly limited. no. When the total content of at least one selected from the fatty acid derivative (A), the fatty acid (B1) and the oil (B2), and the antioxidant (C) is 100 parts by mass, 5 parts by mass of the fatty acid derivative (A) 99.89 parts by mass or more, 0.01 parts by mass or more and 10 parts by mass or less of at least one selected from fatty acid (B1) and fat (B2), and 0.1 part by mass of antioxidant (C) It is preferable to contain at a ratio of 10 parts by mass or less. With such a configuration, the effects of the present invention can be further improved. In the present invention, the content ratio of the fatty acid derivative (A) is 80 parts by mass or more and 99.89 parts by mass or less.

The lower limit of the content of the antioxidant (C) in the treatment agent is preferably 0.1% by mass or more, more preferably 0.15% by mass or more. By setting the content within such a range, the effect of reducing the cotton odor can be further improved. Moreover, the upper limit of the content of the antioxidant (C) is preferably 15% by mass or less, more preferably 10% by mass or less. By setting the content within such a range, the emulsion stability can be further improved. Ranges in which the above upper and lower limits are arbitrarily combined are also envisioned. In the present invention, the content of the antioxidant (C) is 0.1% by mass or more and 10% by mass or less.

<About lubricant (D)>
The treatment agent (D) of the present embodiment may further contain at least one lubricant selected from a hydrocarbon compound, an ester compound (excluding the fatty acid derivative (A) and the fat (B2)), and silicone. good. By blending this lubricant (D), the effects of the present invention, particularly card passability, can be further improved.

Specific examples of hydrocarbon compounds include mineral oil and paraffin wax.
Specific examples of ester compounds include ester compounds of aliphatic monoalcohols and aliphatic monocarboxylic acids such as butyl stearate and stearyl stearate, glycerin monooleate, glycerin trioleate, sorbitan monolaurate, and sorbitan trilaurate. , sorbitan monooleate, sorbitan trioleate, sorbitan monostearate, sorbitan tristearate, and other aliphatic polyhydric alcohols and aliphatic monocarboxylic acids. The ester compound used as a lubricant is a compound obtained by reacting a fatty acid and an alcohol, excluding the fatty acid derivative (A) and the oil (B2).

Specific examples of silicone include dimethylsilicone, aminosilicone, amino-modified silicone, and polyoxyalkylene-modified silicone.
As the lubricant (D), one lubricant may be used alone, or two or more lubricants may be used in combination.

The treatment agent of the present embodiment includes the fatty acid derivative (A) described above in the treatment agent, at least one selected from the fatty acid (B1) and the oil (B2), the antioxidant (C), and the lubricant (D). When containing, there is no particular limitation on the content ratio of these. When the total content of at least one selected from the above-described fatty acid derivative (A), fatty acid (B1) and fat (B2), antioxidant (C), and lubricant (D) is 100 parts by mass, fatty acid 5 parts by mass or more and 98.89 parts by mass or less of the derivative (A), 0.01 parts by mass or more and 10 parts by mass or less of at least one selected from the fatty acid (B1) and the fat (B2), and the antioxidant (C) It is preferable to contain 0.1 parts by mass or more and 10 parts by mass or less and the lubricant (D) in a proportion of 1 part by mass or more and 20 parts by mass or less. With such a configuration, the effects of the present invention can be further improved. In the present invention, the content ratio of the fatty acid derivative (A) is 60 parts by mass or more and 98.89 parts by mass or less.

The lower limit of the content of the lubricant (D) in the treatment agent is preferably 0.1% by mass or more, more preferably 1% by mass or more. By defining the content within such a range, the card passability can be particularly improved. Moreover, the upper limit of the content of the lubricant (D) is preferably 25% by mass or less, more preferably 20% by mass or less. By setting the content within such a range, the emulsion stability can be further improved. Ranges in which the above upper and lower limits are arbitrarily combined are also envisioned.

<About the anionic surfactant (E)>
The processing agent of the present embodiment may further contain an anionic surfactant (E). By blending this anionic surfactant (E), the effects of the present invention, particularly the emulsion stability when the treatment agent is prepared as an aqueous liquid, can be further improved.

As the anionic surfactant (E), a known one can be used as appropriate. Specific examples of the anionic surfactant (E) include (1) aliphatic alcohol phosphors such as lauryl phosphate, cetyl phosphate, octyl phosphate, oleyl phosphate, and stearyl phosphate; (2) aliphatic alcohols such as polyoxyethylene lauryl ether phosphate, polyoxyethylene oleyl ether phosphate, and polyoxyethylene stearyl ether phosphate, selected from ethylene oxide and propylene oxide; (3) laurylsulfonate, myristylsulfonate, cetylsulfonate, oleylsulfonate, stearylsulfonate, tetradecanesulfonate, dodecylbenzenesulfone (4) aliphatic alcohols such as lauryl sulfate, oleyl sulfate, and stearyl sulfate (5) polyoxyethylene lauryl ether sulfate, polyoxyalkylene (polyoxyethylene, polyoxypropylene) lauryl ether sulfate, polyoxyethylene oleyl ether sulfate, etc. (6) castor oil fatty acid sulfate, sesame oil fatty acid sulfate, tall oil fatty acid sulfate, soybean oil fatty acid sulfate, rapeseed oil Fatty acid sulfates such as fatty acid sulfates, palm oil fatty acid sulfates, lard fatty acid sulfates, beef tallow fatty acid sulfates, and whale oil fatty acid sulfates, (7) castor oil sulfates, sesame oil sulfuric acid Ester salts, tall oil sulfates, soybean oil sulfates, rapeseed oil sulfates, palm oil sulfates, lard sulfates, beef tallow sulfates, whale oil sulfates, etc. (8) fatty acid salts such as laurate, oleate and stearate; and (9) fatty alcohol sulfosuccinates such as dioctylsulfosuccinate. Examples of the counter ion of the anionic surfactant include alkali metal salts such as potassium salts and sodium salts, ammonium salts, alkanolamine salts such as triethanolamine, and the like.

As the anionic surfactant (E), one anionic surfactant may be used alone, or two or more anionic surfactants may be used in combination.
The treatment agent of the present embodiment includes at least one selected from the above-described fatty acid derivative (A), fatty acid (B1) and fat (B2), antioxidant (C), and anionic surfactant ( When E) is contained, there is no particular restriction on the content ratio of these. When the total content of at least one selected from the above-described fatty acid derivative (A), fatty acid (B1) and fat (B2), antioxidant (C), and anionic surfactant (E) is 100 parts by mass , 5 parts by mass or more and 98.89 parts by mass or less of fatty acid derivative (A), 0.01 part by mass or more and 10 parts by mass or less of at least one selected from fatty acid (B1) and fat (B2), antioxidant (C ) in a proportion of 0.1 to 10 parts by mass and the anionic surfactant (E) in a proportion of 1 to 20 parts by mass. With such a configuration, the effects of the present invention can be further improved. In the present invention, the content ratio of the fatty acid derivative (A) is 60 parts by mass or more and 98.89 parts by mass or less.

In addition, the treatment agent of the present embodiment includes at least one selected from the above-described fatty acid derivative (A), fatty acid (B1) and fat (B2) in the treatment agent, antioxidant (C), and lubricant ( When D) and an anionic surfactant (E) are contained, there is no particular limitation on their content ratio. Total content of at least one selected from the above-described fatty acid derivative (A), fatty acid (B1) and fat (B2), antioxidant (C), lubricant (D), and anionic surfactant (E) is 100 parts by mass, fatty acid derivative (A) is 5 parts by mass or more and 97.89 parts by mass or less, and at least one selected from fatty acid (B1) and fat (B2) is 0.01 part by mass or more and 10 parts by mass or less. , 0.1 to 10 parts by mass of antioxidant (C), 1 to 20 parts by mass of lubricant (D), and 1 to 20 parts by mass of anionic surfactant (E) It is preferable to contain in the following ratios. With such a configuration, the effects of the present invention can be further improved. In the present invention, the content ratio of the fatty acid derivative (A) is 40 parts by mass or more and 97.89 parts by mass or less.

The lower limit of the content of the anionic surfactant (E) in the treatment agent is preferably 0.1% by mass or more, more preferably 1% by mass or more. By setting the content within such a range, the emulsion stability in particular can be further improved. The upper limit of the content of the anionic surfactant (E) is preferably 25% by mass or less, more preferably 20% by mass or less. By setting the content within such a range, the effect of reducing the falling foam can be further improved. Ranges in which the above upper and lower limits are arbitrarily combined are also envisioned.

<About other ingredients>
The treatment agent of the present embodiment may further contain nonionic surfactants, polyhydric alcohols, etc. other than those described above as other components as long as the effects of the present invention are not impaired.

Specific examples of nonionic surfactants include (1) a compound obtained by adding 10 moles of ethylene oxide to 1 mole of lauryl alcohol, a compound obtained by adding 5 moles of ethylene oxide to 1 mole of stearyl alcohol, and 1 oleyl alcohol. A compound obtained by adding 30 moles of ethylene oxide per mole, a compound obtained by adding 10 moles of ethylene oxide per mole of C12-13 alcohol, and randomly adding 10 moles of ethylene oxide and 10 moles of propylene oxide per mole of lauryl alcohol. A compound obtained by adding 6 mol of ethylene oxide and 2 mol of propylene oxide to 1 mol of C12-13 alcohol at random, adding 5 mol of ethylene oxide to 1 mol of isodecyl alcohol, and then adding 5 mol of propylene oxide. A compound obtained by adding 2 mol of propylene oxide to 1 mol of isodecyl alcohol and then adding 5 mol of ethylene oxide, etc., by adding alkylene oxide to a saturated or unsaturated aliphatic monohydric alcohol. The resulting polyoxyalkylene alkyl (or alkenyl) ether, (2) a compound obtained by adding 10 moles of ethylene oxide to 1 mole of sorbitol and then adding 1 mole of lauric acid, 20 moles of ethylene oxide to 1 mole of sorbitol 1 mol of oleic acid was added after adding 1 mol of oleic acid, a compound obtained by adding 20 mol of ethylene oxide to 1 mol of sorbitol and then adding 1 mol of stearic acid to 1 mol of sorbitol, ethylene to 1 mol of sorbitol Polyoxyalkylene polyhydric alcohol ether obtained by adding alkylene oxide to an aliphatic polyhydric alcohol such as a compound obtained by adding 20 mol of oxide and then adding 3 mol of stearic acid, (3) ethylene oxide to octylphenol Polyoxyalkylene alkylphenol ether obtained by addition reaction of alkylene oxide to alkylphenol, such as a compound obtained by adding 10 moles of ethylene oxide to nonylphenol, such as a compound obtained by adding 10 moles of ethylene oxide to nonylphenol, (4) adding 5 moles of ethylene oxide to octylamine compound, a compound obtained by adding 8 mol of ethylene oxide to laurylamine, a compound obtained by adding 20 mol of ethylene oxide to stearylamine, etc. Polyoxy obtained by addition reaction of alkylene oxide to saturated or unsaturated aliphatic amine Alkylene amino ethers and the like can be mentioned. When two or more types of alkylene oxides are applied, their addition mode may be block addition, random addition, or a combination of block addition and random addition, and there is no particular limitation.

Specific examples of polyhydric alcohols include ethylene glycol, propylene glycol, pentanediol, hexanediol, glycerin, pentaerythritol, sorbitol, sorbitan, polyethylene glycol, polypropylene glycol, reaction products of propylene glycol and alkylene oxide, and the like.

These other components may be used individually by 1 type, and may be used in combination of 2 or more type.
The content of these other components in the treatment agent is preferably 50% by mass or less, more preferably 10% by mass or less, and even more preferably 1% by mass or less, from the viewpoint of not impairing the effects of the present invention.

The viscose rayon to which the treatment agent of the present embodiment is applied may be long fibers generally called filaments or short fibers generally called staples. Short fibers are preferred. The length of the staple fiber in the present embodiment is not particularly limited as long as it corresponds to the staple fiber in this technical field. For example, it is preferably 100 mm or less, more preferably 51 mm or less.

According to the first embodiment, the following effects can be obtained.
(1) The treatment agent of the present embodiment contains the fatty acid derivative (A) described above, at least one selected from the fatty acid (B1) and the fat (B2), and an antioxidant (C). The content of the antioxidant in is 0.1% by mass or more and 10% by mass or less . Therefore, when the viscose rayon to which the treatment agent is adhered is hydroentangled, the effect of reducing foaming caused by the water used for the hydroentanglement can be improved. As a result, the operating efficiency can be improved in the spunlace nonwoven fabric manufacturing process. In addition, it is possible to reduce the cotton odor of the viscose rayon to which the treatment agent has adhered. In addition, the discoloration of the viscose rayon cotton to which the treatment agent is attached can be reduced. In addition, the viscose rayon to which the treatment agent is attached can be improved in cardability when passing through a carding machine. Moreover, the emulsification stability can be improved when the treatment agent is prepared as an aqueous liquid.

(Second embodiment)
Next, a second embodiment of the viscose rayon according to the present invention will be described. The viscose rayon of this embodiment is coated with the treatment agent of the first embodiment.

As a method for attaching the treatment agent, a known method such as an immersion method, a spray method, a shower method, a roller method, a dropping/flowing method, or the like can be applied. Further, the step of attaching is not particularly limited, but examples thereof include a step after the refining step, a spinning step, and the like.

The viscose rayon to be treated with the treatment agent of the present embodiment can be the one described above.
Examples of the form of the treatment agent to be applied to the viscose rayon include an aqueous liquid and an organic solvent solution. In the method of treating viscose rayon, it is preferable to dilute the treatment agent of the first embodiment with water to form an aqueous solution having a concentration of 0.5 to 20% by mass, and to adhere this aqueous solution to the viscose rayon. . The amount of the treating agent to be applied is preferably such that the solid content not containing the solvent is 0.1 to 1% by mass with respect to the viscose rayon.

(Third embodiment)
A third embodiment that embodies the method for producing a spunlace nonwoven fabric according to the present invention will be described.

The spunlace nonwoven fabric is manufactured by sequentially going through a web forming step (step 1) in which viscose rayon is carded to produce a web, and a hydroentangling step (step 2) in which the web is entangled with a water flow. .

(Web forming process)
The web forming step is a step of carding the viscose rayon to which the treatment agent is adhered to produce a web. Carding can be carried out using known carding machines. Examples include flat cards, combination cards, roller cards, and the like.

(Hydroentanglement step)
The hydroentangling step is a step of hydroentangling the web obtained by the web forming step. A web can be irradiated with a high-pressure water jet, and fibers can be entangled by the pressure of the water jet to form a sheet. After performing the hydroentanglement process, a drying process or a winding process may be performed as appropriate.

According to the second and third embodiments, the following effects can be obtained in addition to the above effect (1).
(2) Since the water used in the hydroentanglement can improve the effect of reducing the falling bubbles, the water used in the hydroentanglement can be circulated to perform the hydroentanglement. Therefore, hydroentangling can be performed favorably, and the texture of the spunlaced nonwoven fabric can be improved.

The first to third embodiments can be modified and implemented as follows. The first to third embodiments and the following modifications can be combined with each other within a technically consistent range.

- The processing agent of the above embodiment may contain surfactants other than the above for maintaining the quality of the processing agent, antistatic agents, binders, Ingredients commonly used in treatment agents, such as UV absorbers and pH adjusters, may be further added.

Examples are given below in order to make the configuration and effect of the present invention more specific. The invention is not intended to be limited to these examples.
Test category 1 <Preparation of treatment agent>
(Example 1)
The following materials were used as raw materials for the treatment agent. The numerical value of each component shown in Table 1 indicates the content in the processing agent.

Fatty acid derivative (A): compound obtained by adding 20 moles of ethylene oxide to 1 mole of oleic acid Fatty acid (B): stearic acid Antioxidant (C): 1,3,5-tris (phenolic antioxidant) 4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione and thioether antioxidant Ditridecan-1-yl = 3,3'-sulfanediyl dipropanoate Lubricant (D): Stearyl stearate Anionic surfactant (E): Potassium lauryl phosphate 900 parts of water was added to 100 parts of the treating agent prepared in 1. and stirred at 50° C. to prepare a 10% aqueous liquid containing 10% by mass of the treating agent.

(Examples 2 to 24 and Comparative Examples 1 to 6)
The processing agents of Examples 2 to 24 and Comparative Examples 1 to 6 were prepared in the same manner as the processing agent of Example 1 and its aqueous solution, and 10% aqueous solutions thereof were prepared.

Table 1 summarizes the contents of the processing agents prepared in the above examples. The treatment agents of Examples 3-4, 6, 8, 24 and Comparative Examples 1-2, 6 contain nonionic surfactants and/or polyhydric alcohols as other components. In Example 24 of Table 1, the contents of other components (parts by mass (*)) are shown as parts by mass with respect to 100 parts by mass of components (A) to (E).

Type and content of fatty acid derivative (A), type and content of fatty acid (B1) or fat (B2), type and content of antioxidant (C), type and content of lubricant (D), anion The type and content of the surfactant (E) and the type and content of other components are shown in Table 1, "Fatty acid derivative (A)" column, "Fatty acid, fat (B)" column, "Antioxidant (C) column, "Lubricant (D)" column, "Anionic surfactant (E)" column, and "Other components" column, respectively.

表１に記載する脂肪酸誘導体（Ａ）、脂肪酸（Ｂ１）又は油脂（Ｂ２）、酸化防止剤（Ｃ）、潤滑剤（Ｄ）、アニオン界面活性剤（Ｅ）、その他成分の詳細は以下のとおりである。

Details of fatty acid derivative (A), fatty acid (B1) or fat (B2), antioxidant (C), lubricant (D), anionic surfactant (E), and other components listed in Table 1 are as follows. is.

(Fatty acid derivative (A))
A-1: Compound obtained by adding 20 moles of ethylene oxide to 1 mole of oleic acid A-2: Compound obtained by adding 5 moles of ethylene oxide to 1 mole of stearic acid A-3: Ethylene oxide to 1 mole of stearic acid A-4: Ester compound of 1 mol of a compound obtained by polymerizing 9 mol of ethylene glycol and 2 mol of lauric acid A-5: 1 mol of a compound obtained by polymerizing 23 mol of ethylene glycol and 2 stearic acid Ester compound A-6: A compound obtained by adding 10 mol of ethylene oxide to 1 mol of coconut fatty acid A-7: An ester compound of 1 mol of a compound obtained by polymerizing 14 mol of ethylene glycol and 2 mol of oleic acid A- 8: Compound obtained by adding 10 moles of ethylene oxide to 1 mole of oleic acid A-9: Compound obtained by adding 30 moles of ethylene oxide to 1 mole of oleic acid A-10: Compound 1 obtained by polymerizing 9 moles of ethylene glycol Ester compound of mol and 1 mol of oleic acid (fatty acid (B1) or oil (B2))
B-1: beef tallow B-2: stearic acid B-3: palmitic acid B-4: coconut oil B-5: palm oil B-6: behenic acid B-7: hardened palm oil B-8: hardened castor oil B-9: Castor oil B-10: Oleic acid B-11: Lard B-12: Lauric acid B-13: Coconut fatty acid (antioxidant (C))
C-1: Phenolic antioxidant 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6 -(1H,3H,5H)-trione C-2: pentaerythritol = tetrakis [3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate] which is a phenolic antioxidant
C-3: Phosphorus antioxidant 3,9-bis(2,6-di-t-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5 .5] Undecane C-4: ditridecan-1-yl 3,3′-sulfanediyl dipropanoate which is a thioether antioxidant C-5: 2,2-bis({ [3-(dodecylthio)propionyl]oxy}methyl)-1,3-propanediyl bis[3-(dodecylthio)propionate]
(Lubricant (D))
D-1: Stearyl stearate D-2: Mineral oil (viscosity 500 seconds)
D-3: dimethyl silicone D-4: mineral oil (viscosity 180 seconds)
D-5: amino silicone D-6: paraffin wax D-7: mineral oil (viscosity 60 seconds)
D-8: glycerin monooleate D-9: mineral oil (viscosity 80 seconds)
D-10: Sorbitan tristearate D-11: Sorbitan monostearate (anionic surfactant (E))
E-1: Lauryl phosphate potassium salt E-2: Dioctyl sulfosuccinate sodium salt E-3: Tetradecane sulfonate sodium salt E-4: Sodium oleate E-5: Beef tallow sulfate sodium salt E-6: Stearin Potassium acid (other ingredients)
F-1: A compound obtained by adding 5 mol of ethylene oxide to 1 mol of stearyl alcohol F-2: A compound obtained by randomly adding 6 mol of ethylene oxide and 2 mol of propylene oxide to 1 mol of C12-13 alcohol F-3: Compound F-4: Compound obtained by adding 5 mol of ethylene oxide to 1 mol of isodecyl alcohol and then adding 5 mol of propylene oxide to 1 mol of isodecyl alcohol. Compound to which 5 mol was added F-5: Compound obtained by adding 20 mol of ethylene oxide to 1 mol of sorbitol and then adding 1 mol of stearic acid F-6: Adding 20 mol of ethylene oxide to 1 mol of sorbitol After addition, compound F-7 to which 3 mol of stearic acid was added F-7: Compound obtained by polymerizing 8 mol of propylene glycol F-8: Compound obtained by polymerizing 45 mol of ethylene glycol Test section 2 <To viscose rayon fiber Adhesion of Treatment Agent>
A 10% aqueous solution of each treatment agent prepared in test section 1 was further diluted with water to prepare a 0.2% aqueous emulsion (% by mass). The aqueous emulsion of each example was applied to a viscose rayon fiber having a fineness of 1.3 × 10 ^-4 g/m (1.2 denier) and a fiber length of 38 mm, and the adhesion amount (excluding the solvent) was 0.2% by mass. It was adhered by spray lubrication. After drying with a hot air dryer at 80°C for 2 hours, the fiber was moistened overnight in an atmosphere of 25°C and 40% RH to obtain a viscose rayon fiber to which the treating agent was adhered.

Test category 3 <Evaluation of treatment agent>
(Evaluation test)
Using the viscose rayon fibers to which the treatment agent was adhered, each test such as a falling foam test, a cotton odor test, a cotton discoloration test, a card passability test, and an emulsion stability test was carried out. The procedure for each test is shown below. Table 2 shows the results of each test.

(Drop-off foaming test)
First, 20 g of the viscose rayon fiber to which the treatment agent was attached was put into 150 g of water, and after 15 minutes, the treated cotton was squeezed using a hand juicer. 10 g of this squeezed liquid was placed in a graduated cylinder with a 25 ml stopper and vigorously shaken for 30 seconds. After standing still for 30 seconds, it was strongly shaken again for 30 seconds. After standing still for 5 minutes, the height from the water surface to the upper surface of the foam was measured. The results are shown in Table 2, "Foamability test" column.

Evaluation criteria for the falling foam test ◎ (good); height from water surface to top surface of foam is less than 1 mm ○ (acceptable); height from water surface to top surface of foam is 1 mm or more and less than 2 mm × (impossible); The height from the surface of the water to the upper surface of the foam is 2 mm or more (cotton odor test)
20 g of the viscose rayon fiber to which the treatment agent was attached was put into 150 g of water, and after sealing for 30 minutes, the odor was smelled. The cotton odor test was performed on 10 testers. The results are shown in Table 2, "Cotton Odor Test" column.

Evaluation criteria for cotton odor test ◎◎ (excellent); no one judged that there was an odor ◎ (good); 1-2 people judged that there was an odor ○ (acceptable); ; 6 or more people determined that there was an odor (cotton discoloration test)
It was determined whether or not the viscose rayon fibers to which the treatment agent had been applied had undergone discoloration, such as yellowing, compared to before the treatment agent was applied. The cotton discoloration test was performed on 10 testers. The results are shown in Table 2, "Cotton discoloration test" column.

Evaluation criteria for cotton discoloration test ◎◎ (excellent); no judge of discoloration ◎ (good); 1 to 2 people judged to have discoloration ○ (acceptable); ; 6 or more people determined that there was discoloration (evaluation of card passability)
20 g of the viscose rayon fiber to which the treatment agent was adhered was subjected to a miniature carding machine after being subjected to humidity conditioning in a constant temperature room of 20° C. and 65% RH for 24 hours. The ratio of the amount of discharge to the amount of input was calculated and evaluated according to the following evaluation criteria. The results are shown in Table 2, "Card passability test" column.

Evaluation criteria for card passability ◎ (Good): Ejection amount is 90% or more ○ (Possible): Ejection amount is 80% or more and less than 90% × (Failure): Ejection amount is less than 80% (Evaluation of emulsification stability)
100 g of the 10% aqueous solution of each treatment agent prepared in test section 1 was placed in a 100 ml carrot-type precipitation bottle and allowed to stand at 25°C. After 24 hours, the amount of precipitate was confirmed and evaluated according to the following evaluation criteria. The results are shown in the "emulsion stability test" column of Table 2.

Emulsion stability evaluation criteria ◎ (good); sedimentation amount is 0.1 ml or less ○ (acceptable); sedimentation amount is more than 0.1 ml and 0.5 ml or less × (improper);

表２の結果から明らかなように、本発明の処理剤によれば、水流交絡で使用した水の脱落起泡の低減効果を向上できるという効果がある。また、処理剤を付着させた繊維の綿臭気を少なくできるという効果がある。

As is clear from the results in Table 2, the treatment agent of the present invention has the effect of improving the effect of reducing foaming caused by the water used in hydroentangling. In addition, there is an effect that the cotton odor of the fibers to which the treatment agent is adhered can be reduced.

Claims (10)

A treatment agent for viscose rayon comprising the following fatty acid derivatives, at least one selected from the following fatty acids and oils and fats, and an antioxidant ,
A treating agent for viscose rayon, wherein the content of the antioxidant in the treating agent for viscose rayon is 0.1% by mass or more and 10% by mass or less.
Fatty acid derivative: A compound obtained by adding 1 mol or more and 30 mol or less of ethylene oxide to 1 mol of a fatty acid having 12 or more and 24 or less carbon atoms, and 1 mol of a compound obtained by polymerizing 4 mol or more and 50 mol or less of ethylene glycol and carbon. at least one selected from an ester compound with 1 mol or more and 2 mol or less of a fatty acid having a number of 12 or more and 24 or less;
Fatty acid: A fatty acid having 12 to 24 carbon atoms.
Fats and oils: At least one selected from vegetable oils, animal oils, and hardened oils thereof. When the total content of the fatty acid derivative, at least one selected from the fatty acid and the fat and the antioxidant, and the antioxidant is 100 parts by mass,
80 to 99.89 parts by mass of the fatty acid derivative, 0.01 to 10 parts by mass of at least one selected from the fatty acid and the fat, and 0.1 part by mass or more of the antioxidant The treatment agent for viscose rayon according to claim 1, which is contained in a proportion of 10 parts by mass or less. The treatment agent for viscose rayon according to claim 1, further comprising at least one selected from the following lubricants and anionic surfactants.
Lubricant: at least one selected from hydrocarbon compounds, ester compounds (excluding the above oils and fats and the above fatty acid derivatives), and silicones. At least one selected from the fatty acid derivative, the fatty acid and the fat, the antioxidant, and the lubricant,
When the total content of at least one selected from the fatty acid derivative, the fatty acid and the fat, the antioxidant, and the lubricant is 100 parts by mass,
60 to 98.89 parts by mass of the fatty acid derivative, 0.01 to 10 parts by mass of at least one selected from the fatty acid and the fat, and 0.1 to 10 parts by mass of the antioxidant 4. The treatment agent for viscose rayon according to claim 3, containing not more than 1 part by mass and 1 part by mass or more and 20 parts by mass or less of the lubricant. At least one selected from the fatty acid derivative, the fatty acid and the fat, the antioxidant, and the anionic surfactant,
When the total content of at least one selected from the fatty acid derivative, the fatty acid and the fat, the antioxidant, and the anionic surfactant is 100 parts by mass,
60 to 98.89 parts by mass of the fatty acid derivative, 0.01 to 10 parts by mass of at least one selected from the fatty acid and the fat, and 0.1 to 10 parts by mass of the antioxidant 4. The treatment agent for viscose rayon according to claim 3, which contains not more than 1 part by mass and not more than 1 part by mass and not more than 20 parts by mass of the anionic surfactant. At least one selected from the fatty acid derivative, the fatty acid and the fat, the antioxidant, the lubricant, and the anionic surfactant,
When the total content of at least one selected from the fatty acid derivative, the fatty acid and the fat, the antioxidant, the lubricant, and the anionic surfactant is 100 parts by mass,
40 to 97.89 parts by mass of the fatty acid derivative, 0.01 to 10 parts by mass of at least one selected from the fatty acid and the fat, and 0.1 to 10 parts by mass of the antioxidant 4. The treatment agent for viscose rayon according to claim 3, which contains 1 part by mass or more and 20 parts by mass or less of the lubricant, and 1 part by mass or more and 20 parts by mass or less of the anionic surfactant. The treatment agent for viscose rayon according to any one of claims 1 to 6, wherein the viscose rayon is short viscose rayon fiber. A viscose rayon to which the treating agent for viscose rayon according to any one of claims 1 to 6 is adhered. A viscose rayon staple fiber to which the viscose rayon treatment agent according to any one of claims 1 to 6 is adhered. A method for producing a spunlace nonwoven fabric, comprising the following steps 1 and 2.
Step 1: A step of carding the viscose rayon short fibers according to claim 9 to produce a web.
Step 2: A step of entangling the web obtained in the step 1 with a water flow.