JP6795228B1 - Treatment agents, flame-resistant non-woven fabrics, carbon fiber non-woven fabrics, and their manufacturing methods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing agent capable of improving card passability and web uniformity. Further, the present invention provides a flame-resistant non-woven fabric and a carbon fiber non-woven fabric having excellent web uniformity. The present invention is a treatment agent for flame-resistant non-woven fabrics or carbon fiber non-woven fabrics, which is characterized by containing an organic sulfonate. Further, it is a flame-resistant non-woven fabric or carbon fiber non-woven fabric to which such a treatment agent is attached. [Selection diagram] None

Description

The present invention relates to a treatment agent, a flame-resistant non-woven fabric, a carbon fiber non-woven fabric, and a method for producing the same.

In general, carbon fibers or flame-resistant fibers are widely used in various fields such as building materials and transportation equipment as carbon fiber composite materials or flame-retardant / flame-retardant materials combined with a matrix resin such as an epoxy resin. For example, carbon fiber is produced as a carbon fiber precursor through, for example, a step of spinning acrylic fiber, a step of stretching the fiber, a flame resistance step, and a carbonization step.

In addition to woven fabrics, carbon fibers or flame-resistant fibers may be used by molding into a non-woven fabric or the like obtained by using a roller card (card machine). When manufacturing a non-woven fabric, a treatment for adhering a non-woven fabric manufacturing treatment agent containing a phosphorus-based organic compound may be performed on the surface of the fiber from the viewpoint of imparting various properties such as card permeability to the raw material fiber. ..

Conventionally, a treatment agent disclosed in Patent Document 1 is known. Patent Document 1 discloses a step of adhering a treatment agent containing trihydroxyethyl phosphate as a phosphorus-based organic compound to polyacrylonitrile-based oxide fibers and then processing a non-woven fabric.

Japanese Unexamined Patent Publication No. 2003-555878

However, conventional treatment agents are still inadequate in card passability and web uniformity.
An object to be solved by the present invention is to provide a treatment agent capable of improving card passability and web uniformity. Another object of the present invention is to provide a flame-resistant non-woven fabric having excellent web uniformity, a carbon fiber non-woven fabric, and a method for producing the same.

As a result of research to solve the above-mentioned problems, the present inventors have found that a treatment agent for producing a flame-resistant fibrous nonwoven fabric or a carbon fiber nonwoven fabric containing an organic sulfonate is just suitable.

In order to solve the above problems, the treatment agent for producing a flame-resistant fibrous nonwoven fabric according to one aspect of the present invention is characterized by containing an organic sulfonate and a polyoxyalkylene alkyl ether.
In the treatment agent, the organic sulfonate preferably contains an alkali metal salt of an organic sulfonic acid.

In the treatment agent, it is preferable that the organic sulfonic acid alkali metal salt contains an aliphatic organic sulfonic acid alkali metal salt.
In the treatment agent, it is preferable that the aliphatic organic sulfonic acid alkali metal salt has an aliphatic hydrocarbon group having 6 to 20 carbon atoms in the molecule.

In the treatment agent, it is preferable that the polyoxyalkylene alkyl ether contains a compound obtained by adding ethylene oxide and propylene oxide to alcohols.

In the treatment agent, the mass ratio of the content of the organic sulfonate and the content of the polyoxyalkylene alkyl ether is polyoxyalkylene alkyl ether / organic sulfonate = 2 to 50/98 to 50. Is preferable.

In order to solve the above problems, the flame-resistant fibrous nonwoven fabric of another aspect of the present invention is characterized in that the treatment agent is attached.
In order to solve the above problems, another method of producing a flame-resistant fibrous nonwoven fabric of the present invention is characterized in that a flame-resistant fibrous nonwoven fabric is obtained after the treatment agent is attached to the flame-resistant fibers.
In order to solve the above problems, the treatment agent for producing a carbon fiber nonwoven fabric according to one aspect of the present invention is characterized by containing an organic sulfonate and a polyoxyalkylene alkyl ether .
In the treatment agent, the organic sulfonate preferably contains an alkali metal salt of an organic sulfonic acid.
In the treatment agent, it is preferable that the organic sulfonic acid alkali metal salt contains an aliphatic organic sulfonic acid alkali metal salt.
In the treatment agent, it is preferable that the aliphatic organic sulfonic acid alkali metal salt has an aliphatic hydrocarbon group having 6 to 20 carbon atoms in the molecule.
Prior Symbol treatment agent, wherein the polyoxyalkylene alkyl ether is preferably one containing a compound obtained by adding ethylene oxide and propylene oxide to an alcohol.
The mass ratio of the content of the organic sulfonate to the content of the polyoxyalkylene alkyl ether is preferably polyoxyalkylene alkyl ether / organic sulfonate = 2 to 50/98 to 50.
In order to solve the above problems, another method of producing a carbon fiber nonwoven fabric of the present invention is characterized in that the treated agent is attached to the carbon fibers and then the carbon fiber nonwoven fabric is obtained.
In order to solve the above problems, the carbon fiber nonwoven fabric to another aspect of the present invention is characterized in that the treatment agent is adhered.

According to the present invention, card passability and web uniformity can be improved.

(First Embodiment)
Hereinafter, a first embodiment embodying a treatment agent for producing a flame-resistant fibrous nonwoven fabric or a carbon fiber nonwoven fabric of the present invention (hereinafter, also simply referred to as a treatment agent) will be described. The treatment agent of the present embodiment contains an organic sulfonate . Treating agents for resistant Honooka fiber nonwoven fabric production and processing agent for carbon fiber nonwoven fabric manufacturing further comprises a polyoxyalkylene alkyl ether.

By blending an organic sulfonate, card passability and web uniformity are improved. Examples of the organic sulfonic acid constituting the organic sulfonic acid salt include an aliphatic organic sulfonic acid and an aromatic organic sulfonic acid. When the organic sulfonic acid contains a hydrocarbon group, the hydrocarbon may be linear or branched. Specific examples of the aliphatic organic sulfonic acid include heptyl sulfonic acid, 2-ethylhexyl sulfonic acid, octyl sulfonic acid, nonyl sulfonic acid, decyl sulfonic acid, undecyl sulfonic acid, dodecyl sulfonic acid, tridecyl sulfonic acid, and tetra. Decyl sulfonic acid, pentadecyl sulfonic acid, hexadecyl sulfonic acid, heptadecyl sulfonic acid, octadecyl sulfonic acid, isooctyl sulfonic acid, isodecyl sulfonic acid, isoundecyl sulfonic acid, isododecyl sulfonic acid, isotridecyl sulfonic acid, Isotetradecylsulfonic acid, isopentadecylsulfonic acid, isohexadecylsulfonic acid, isoheptadecylsulfonic acid, isooctadecylsulfonic acid, alkyl (mixture of 13-17 carbon atoms) sulfonic acid, di-2-ethylhexyl sulfosuccinate, Examples thereof include dioctyl sulfosuccinate, dinonyl sulfosuccinate, didodecyl sulfosuccinate, dihexadecyl sulfosuccinate, diisobutyl sulfosuccinate and the like.

Specific examples of aromatic organic sulfonic acids include decylbenzenesulfonic acid, undecylbenzenesulfonic acid, dodecylbenzenesulfonic acid, tridecylbenzenesulfonic acid, tetradecylbenzenesulfonic acid, pentadecylbenzenesulfonic acid, and hexadecylbenzene. Examples thereof include sulfonic acid and hexadecyldiphenyl ether disulfonic acid.

Examples of the salt used as a counter for the organic sulfonic acid include an alkali metal salt, an ammonium salt, an organic amine salt and the like. Specific examples of the alkali metal salt include sodium salt, potassium salt and the like. Specific examples of the organic amine salt include polyoxyalkylene alkylamine, monoalkanolamine, dialkanolamine, trialkanolamine and the like.

Among these specific examples, the organic sulfonate preferably contains an alkali metal salt of an organic sulfonic acid. With such a configuration, card passability and web uniformity are further improved.

Further, among these specific examples, the organic sulfonate preferably contains an aliphatic organic sulfonic acid alkali metal salt. With such a configuration, card passability and web uniformity are further improved.

Further, among these specific examples, the organic sulfonate preferably contains an aliphatic organic sulfonic acid alkali metal salt having an aliphatic hydrocarbon group having 6 to 20 carbon atoms in the molecule. With such a configuration, card passability and web uniformity are further improved.

As the above-mentioned organic sulfonate, one kind of organic sulfonate may be used alone, or two or more kinds of organic sulfonates may be used in combination as appropriate.
Treatment agent and treatment agent for carbon fiber nonwoven fabric manufacturing for resistance Honooka fiber nonwoven fabric manufacture of the present embodiment further contains a polyoxyalkylene alkyl ether. With such a configuration, card passability and web uniformity are further improved.

Examples of the polyoxyalkylene alkyl ether include compounds obtained by adding an alkylene oxide to alcohols. The alcohols may be monohydric alcohols, polyhydric alcohols, or aromatic alcohols.

Specific examples of alcohols used as raw materials for polyoxyalkylene alkyl ether include (1) methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, and tetradecanol. , Pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eikosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptacosanol, octacosanol, nonacosanol, triacon Linear alkyl alcohols such as tanol, (2) Isopropanol, Isobutanol, Isohexanol, 2-Ethylhexanol, Isononanol, Isodecanol, Isotridecanol, Isotetradecanol, Isotriacontanol, Isohexadecanol, Isohepta Decanol, Isooctadecanol, Isononadecanol, Isoeicosanol, Isoheneicosanol, Isodocosanol, Isotricosanol, Isotetracosanol, Isopentacosanol, Isohexacosanol, Isohepta Branched alkyl alcohols such as cosanol, isooctacosanol, isononacosanol, and isopentadecanol, (3) linear alkenyl alcohols such as tetradecenol, hexadecenol, heptadecenol, octadecenol, nonadecanol, (4) isohexadecenol, isoocta Branched alkenyl alcohols such as decenol, cyclic alkyl alcohols such as (5) cyclopentanol and cyclohexanol, (6) aromatics such as phenol, benzyl alcohol, monostyrene phenol, distyrene phenol, tristyrene phenol Alcohol, (7) ethylene glycol, propylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,4-butanediol, 2-methyl- 1,2-Propanediol, 1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, 2-methyl-2,4-pentanediol, 2,3-dimethyl-2,3-butane Diol, glycerin, 2-methyl-2-hydroxymethyl-1,3-propanediol, 2-ethyl-2-hydroxymethyl-1,3- Examples thereof include polyhydric alcohols such as propanediol, trimethylolpropane, sorbitan, pentaerythritol, and sorbitol.

Specific examples of the alkylene oxide used as a raw material for the polyoxyalkylene alkyl ether include ethylene oxide and propylene oxide. The number of moles of alkylene oxide added is appropriately set, but is preferably 0.1 to 60 mol, more preferably 1 to 40 mol, still more preferably 2 to 30 mol, and particularly preferably 2 to 20 mol. The number of moles of alkylene oxide added indicates the number of moles of alkylene oxide per mole of alcohols in the raw material to be charged. Further, the alkylene oxide may be configured as a random adduct or a block adduct.

The mass average molecular weight of the polyoxyalkylene alkyl ether is not particularly limited, but is preferably 1,800 or less, more preferably 1,500 or less, still more preferably 1,000 or less. By defining in such a range, the effect of the present invention when used in combination with an organic sulfonate is further improved. The mass average molecular weight of the polyoxyalkylene alkyl ether can be measured by gel permeation chromatography (GPC).

In the treatment agent of the present embodiment, it is preferable that the polyoxyalkylene alkyl ether contains a compound obtained by adding ethylene oxide and propylene oxide to alcohols. With such a configuration, the web uniformity is further improved.

As the above-mentioned polyoxyalkylene alkyl ether, one kind of polyoxyalkylene alkyl ether may be used alone, or two or more kinds of polyoxyalkylene alkyl ethers may be used in combination as appropriate.

In the treatment agent of the present embodiment, the mass ratio of the content of the organic sulfonate and the content of the polyoxyalkylene alkyl ether is appropriately set, but the polyoxyalkylene alkyl ether / organic sulfonate = 2 to 50. It is preferably / 98 to 50, and more preferably 5 to 40/95 to 60. By defining in such a range, the web uniformity is further improved.

(Second Embodiment)
Next, the flame-resistant non-woven fabric and the carbon fiber non-woven fabric (hereinafter, also simply referred to as non-woven fabric) according to the present invention, or a second embodiment embodying a method for producing them will be described. In the non-woven fabric of the present embodiment, the treating agent of the first embodiment is attached to the non-woven fabric. The nonwoven fabric of the present embodiment is produced by first performing a step of adhering the treatment agent of the first embodiment to the flame-resistant fiber or the carbon fiber, and then performing a web forming step by carding. The amount of the treatment agent adhered to the non-woven fabric is not particularly limited, but the treatment agent (without solvent) adheres to the non-woven fabric so as to be preferably 0.01 to 10% by mass, more preferably 0.1 to 2% by mass. doing.

The types of flame-resistant fibers and carbon fibers constituting the non-woven fabric are not particularly limited, and examples thereof include PAN-based fibers obtained from acrylic fibers as raw materials and pitch-based fibers obtained from pitch as raw materials. For example, when acrylic fiber is used, the acrylic fiber is composed of a fiber containing polyacrylonitrile as a main component, which is obtained by copolymerizing at least 90 mol% or more of acrylonitrile and 10 mol% or less of a flame resistance promoting component. Is preferable. As the flame resistance promoting component, for example, a vinyl group-containing compound having copolymerizability with acrylonitrile can be preferably used. The single fiber fineness of the raw material fiber is not particularly limited, but is preferably 0.1 to 2.0 dTex from the viewpoint of the balance between performance and manufacturing cost. The number of single fibers constituting the fiber bundle of the raw material fiber is also not particularly limited, but is preferably 1,000 to 96,000 from the viewpoint of the balance between performance and manufacturing cost.

In the method for producing flame-resistant fiber or carbon fiber of the present embodiment, a silk-reeling step of first obtaining the above-mentioned raw material fiber and then spinning the yarn is performed. Next, a flame-resistant treatment step is performed in which the fiber bundle produced in the silk-reeling step is converted into flame-resistant fibers in an oxidizing atmosphere at 200 to 300 ° C., preferably 230 to 270 ° C. Further, when carbon fibers are obtained, a carbonization treatment step of carbonizing the flame-resistant fibers in an inert atmosphere at 300 to 2000 ° C., preferably 300 to 1300 ° C. is performed. The carbonization treatment step may be performed following the flame resistance treatment step.

In the method for producing a non-woven fabric of the present embodiment, as described above, the step of first adhering the treatment agent of the first embodiment to the flame-resistant fiber or the carbon fiber is performed. As a method for adhering the treatment agent to the flame-resistant fiber or the carbon fiber, a known method can be appropriately adopted. For example, a generally industrially used method such as an immersion lubrication method, a roller immersion method, a roller contact method, a spray method, a papermaking method, and a guide lubrication method using a measuring pump can be applied.

Examples of the form for adhering the treatment agent of the first embodiment to the fiber include an organic solvent solution and an aqueous solution. The treatment agent is preferably attached to the flame resistant fibers or carbon fibers in the form of an aqueous emulsion solution. The length of the fiber to which the treatment agent is applied is not particularly limited, and examples thereof include short fibers generally called staples and long fibers generally called filaments.

Subsequently, a flame-resistant fiber or a carbon fiber strand can be obtained by performing a drying treatment to remove a solvent such as water contained in the solution of the treatment agent. For the drying treatment here, for example, a method using hot air, a hot plate, a roller, various infrared heaters, or the like as a heat medium can be adopted.

Next, a web forming step is performed. The web forming step is a step of forming a web made of a non-woven fabric by carding the flame-resistant fiber or carbon fiber to which the treatment agent is attached. Carding can be performed using a known card machine. For example, a flat card, a combination card, a roller card and the like can be mentioned.

The actions and effects of the treatment agent of the present embodiment, the flame-resistant non-woven fabric, the carbon fiber non-woven fabric, and the method for producing them will be described.
(1) In the present embodiment, an organic sulfonate is contained in a treatment agent for producing a flame-resistant fiber nonwoven fabric or a carbon fiber nonwoven fabric, which is applied to fibers before manufacturing the nonwoven fabric. Therefore, when the non-woven fabric is formed from flame-resistant fibers or carbon fibers using a card machine, the card passability can be improved by suppressing the fibers from falling off. Further, it is possible to obtain a flame-resistant fiber non-woven fabric or a carbon fiber non-woven fabric which has no spots on the manufactured card web and has excellent web uniformity.

The above embodiment may be changed as follows.
-The treatment agent of the present embodiment includes a surfactant, an antistatic agent, and a binder other than the above as stabilizers and antistatic agents for maintaining the quality of the treatment agent within a range that does not impair the effects of the present invention. Ingredients used in ordinary treatment agents such as agents, antioxidants, and UV absorbers may be further added.

Hereinafter, examples and the like will be given in order to make the configuration and effects of the present invention more specific, but the present invention is not limited to these examples. In the following Examples and Comparative Examples, parts mean parts by mass and% means% by mass.

Test Category 1 (Preparation of treatment agent for manufacturing flame-resistant non-woven fabric or carbon fiber non-woven fabric)
Example 1: As shown in Table 1, 80 parts of sodium salt (A-1) of dodecyl-6-sulfonic acid and a compound (B-) obtained by adding 10 mol of ethylene oxide and 5 mol of propylene oxide to tetradecyl alcohol. 1) The treatment agent of Example 1 was prepared by mixing 20 parts well and gradually adding ion-exchanged water so that the solid content concentration became 30% while continuing stirring.

Examples 2 to 12 , 15 to 20, Reference Examples 13, 14, 21 and 22, and Comparative Examples 1 to 12: Organic sulfonates and polyoxyalkylene alkyl ethers shown in Table 1 in the same manner as in Example 1. , And, if necessary, by mixing all or part of the other compounds well to make them uniform, the treatments of Examples 2 to 12 , 15 to 20, Reference Examples 13, 14, 21 and 22, and Comparative Examples 1 to 12. The agent was prepared.

The types and contents of organic sulfonates, types and contents of polyoxyalkylene alkyl ethers, and types and contents of other compounds in the treatment agents of each example are shown in the "Organic Sulfates" column of Table 1, "Poly". It is as shown in the "Oxyalkylene alkyl ether" column and the "Other compounds" column.

In Table 1,
A-1: Sodium salt of dodecyl-6-sulfonic acid A-2: Potassium salt of tetradecyl-7-sulfonic acid A-3: Sodium salt of octadecylsulfonic acid A-4: Sodium salt of octylsulfonic acid A-5: Sodium salt of dodecylbenzene sulfonic acid A-6: Ammonium salt of dodecyl-6-sulfonic acid A-7: Dibutylethanolamine salt of dodecyl-6-sulfonic acid A-8: Triethanolamine salt of dodecylbenzenesulfonic acid ra- 1: Dodecyl-6-sulfonic acid ra-2: Dodecylbenzenesulfonic acid B-1: A compound obtained by adding 10 mol of ethylene oxide and 5 mol of propylene oxide to tetradecyl alcohol B-2: 5 mol of ethylene oxide and propylene to dodecyl alcohol. Compound with 10 mol of oxide added B-3: 10 mol of ethylene oxide adduct of dodecyl alcohol C-1: Trihydroxyethyl phosphate C-2: Potassium lauryl phosphate.

Test Category 2 (Manufacture of flame-resistant non-woven fabric and carbon fiber non-woven fabric)
The flame-resistant non-woven fabric and the carbon fiber non-woven fabric were produced by using the treatment agent for producing the flame-resistant fiber non-woven fabric or the carbon fiber non-woven fabric prepared in Test Category 1.

A copolymer having an ultimate viscosity of 1.80 consisting of 95% by mass of acrylonitrile, 3.5% by mass of methyl acrylate, and 1.5% by mass of methacrylic acid is dissolved in dimethylacetamide (DMAC) to have a polymer concentration of 21.0% by mass. %, A spinning stock solution having a viscosity at 60 ° C. of 500 poise was prepared. The spinning stock solution was discharged into a coagulation bath of a 70% by mass aqueous solution of DMAC maintained at a spinning bath temperature of 35 ° C. from a spinning cap having a pore diameter (inner diameter) of 0.075 mm and a hole number of 12,000 at a draft ratio of 0.8.

The coagulated yarn was stretched 5 times in a water washing tank at the same time as desolvation to prepare a water-swelled acrylic fiber strand. A 4% ion exchange aqueous solution of a known carbon fiber precursor treatment agent was refueled by a dipping method so that the amount of the carbon fiber precursor treatment agent adhered was 1% by mass (solvent-free). After that, the acrylic fiber strands are dried and densified with a heating roller at 130 ° C., further stretched 1.7 times between the heating rollers at 170 ° C., and then wound around a thread tube to form a carbon fiber precursor. Obtained. A yarn was unwound from this carbon fiber precursor and treated for flame resistance in an air atmosphere of 200 ° C. to 300 ° C. to obtain a flame resistant fiber. Then, it was calcined in a carbonization furnace having a temperature gradient of 300 to 1,300 ° C. in a nitrogen atmosphere to convert it into carbon fibers, and then wound on a thread tube.

The flame-resistant fibers and carbon fibers obtained as described above are each cut to 50 mm, and then immersed in a 2% aqueous solution of the treatment agent prepared in Test Category 1, so that the treatment agent has a solid content of 1 on the fibers. A fiber imparted with 0.0% was obtained.

Using the resulting fibers, card passability and web uniformity were evaluated as shown below. The results are shown in the "Card Passability" and "Web Uniformity" columns of Table 1.
Test category 3 (evaluation)
-Card passability 20 g of flame-resistant fiber or carbon fiber treated with the treatment agent obtained as described above is subjected to humidity control for 24 hours in a constant temperature room of 65% RH at 20 ° C. did. The ratio of the discharged amount (g) to the input amount (g) was calculated and evaluated according to the following criteria.

・ Evaluation criteria for card passability 4: Emissions are 85% or more 3: Emissions are 70% or more and less than 85% 2: Emissions are 60% or more and less than 70% 1: Emissions are less than 60% ・ Web uniform Sex The uniformity of the texture of the card web created by the card passability evaluation was visually evaluated according to the following criteria.

・ Evaluation criteria for web uniformity ◎: When there is no spot and it is uniform ○: When slight spots are observed but there is no problem in practical use ×: When spots can be clearly confirmed in a wide range and it is not a product Table As is clear from the evaluation results of each Example for each Comparative Example of No. 1, according to the treatment agent of the present invention, card passability and web uniformity can be improved.

Claims (16)

A treatment agent for producing a flame-resistant fibrous nonwoven fabric, which comprises an organic sulfonate and a polyoxyalkylene alkyl ether. The treatment agent according to claim 1, wherein the organic sulfonate contains an alkali metal salt of an organic sulfonic acid. The treatment agent according to claim 2, wherein the organic sulfonic acid alkali metal salt contains an aliphatic organic sulfonic acid alkali metal salt. The treatment agent according to claim 3, wherein the aliphatic organic sulfonic acid alkali metal salt has an aliphatic hydrocarbon group having 6 to 20 carbon atoms in the molecule. The treatment agent according to any one of claims 1 to 4, wherein the polyoxyalkylene alkyl ether contains a compound obtained by adding ethylene oxide and propylene oxide to alcohols. The mass ratio of the content of the organic sulfonate to the content of the polyoxyalkylene alkyl ether is polyoxyalkylene alkyl ether / organic sulfonate = 2 to 50/98 to 50. The treatment agent according to any one item. A flame-resistant fibrous nonwoven fabric to which the treatment agent according to any one of claims 1 to 6 is attached. A method for producing a flame-resistant fiber non-woven fabric, which comprises attaching the treatment agent according to any one of claims 1 to 6 to the flame-resistant fiber and then obtaining the flame-resistant fiber non-woven fabric. A treatment agent for producing a carbon fiber nonwoven fabric, which comprises an organic sulfonate and a polyoxyalkylene alkyl ether . The treatment agent according to claim 9, wherein the organic sulfonate contains an alkali metal salt of an organic sulfonic acid. The treatment agent according to claim 10, wherein the organic sulfonic acid alkali metal salt contains an aliphatic organic sulfonic acid alkali metal salt. The treatment agent according to claim 11, wherein the aliphatic organic sulfonic acid alkali metal salt has an aliphatic hydrocarbon group having 6 to 20 carbon atoms in the molecule. The treatment agent according to any one of claims 9 to 12, wherein the polyoxyalkylene alkyl ether contains a compound obtained by adding ethylene oxide and propylene oxide to alcohols. Claims 9 to 13 in which the mass ratio of the content of the organic sulfonate to the content of the polyoxyalkylene alkyl ether is polyoxyalkylene alkyl ether / organic sulfonate = 2 to 50/98 to 50 . The treatment agent according to any one item . A method for producing a carbon fiber non-woven fabric, which comprises adhering the treatment agent according to any one of claims 9 to 14 to carbon fibers to obtain a carbon fiber non-woven fabric. A carbon fiber nonwoven fabric to which the treatment agent according to any one of claims 9 to 14 is attached.