Carbon fiber treatment agent composition, carbon fiber treatment agent, method for producing the same, and carbon fiber precursor

Abstract

The present invention provides a carbon fiber treatment agent composition, a carbon fiber treatment agent, a method for producing the same, and a carbon fiber precursor. [Solution] The carbon fiber treatment agent composition comprises a modified polyorganosiloxane having at least one modified functional group, a dispersant having the structure shown in formula (I) in an amount of 10 wt% to 50 wt% per 100 wt% of the modified polyorganosiloxane, and water. The dispersant having a specific structure allows the modified polyorganosiloxane to be dispersed in water, thereby providing the carbon fiber treatment agent with good emulsification stability and thermal stability. [Formula 1] Each substituent is defined in the specification.

Description

Technical Field

[0001] The present invention relates to a carbon fiber treatment agent composition, and particularly to a carbon fiber treatment agent composition, a carbon fiber treatment agent, a method for producing the same, and a carbon fiber precursor.

Background Art

[0002] Carbon fiber is a fibrous carbon material containing carbon atoms with a composition of about 90% or more, and since the carbon atoms are continuously arranged along the axial direction of the fiber, carbon fiber usually has good mechanical properties. The characteristics of carbon fiber are that it is lightweight and has high strength. For example, the specific gravity of carbon fiber is about 1 / 4 times that of iron, the tensile strength is about 10 times that of iron, and the Young's modulus is about 7 times that of iron. Because carbon fiber has the aforementioned characteristics, it can achieve weight reduction needs in use instead of metal. In addition, carbon fiber has properties such as high strength, high modulus, high temperature resistance, corrosion resistance, low expansibility, and dimensional stability, and is also used as a reinforcing material for forming a synthetic resin base material such as epoxy resin and a carbon fiber reinforcing material, so it can be applied to technical fields such as aviation, military industry, and high-tech. The need for carbon fiber composites is expected to continue to increase.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The production of carbon fiber generally uses polyacrylonitrile (PAN)-based filaments as raw materials for producing carbon fiber filaments. In the processing process of PAN filaments, processes such as stretching, high temperature, oxidation, and carbonization must be passed through. However, carbon fiber filaments are prone to problems of filament softening during the high-temperature forging process, and are prone to contact friction with the roller surface during the processing and conveying process, causing fluffing and other defects, and further reducing the quality of the obtained carbon fiber.

[0004] To prevent the above defects, it is necessary to adjust the frictional properties of the carbon fiber filaments with a carbon fiber treatment agent to prevent and / or eliminate the accumulation of static electricity, and further assist in the production of carbon fiber filaments. The carbon fiber treatment agent forms a film on the surface of the carbon fibers, preventing adhesion and friction between the carbon fiber filaments, thereby avoiding the occurrence of defects in the carbon fibers.

[0005] The main component of conventional carbon fiber treatment agents is amine polyorganosiloxane. However, due to the high viscosity of amine polyorganosiloxane, it is necessary to dissolve it in a solvent to coat carbon fiber filaments. However, because amine polyorganosiloxane is hydrophobic, an organic solvent must be used. Since organic solvents are usually flammable and volatile, this can lead to safety and pollution problems.

[0006] In light of this, there is an urgent need to provide a carbon fiber treatment agent composition, a carbon fiber treatment agent, and a method for producing the same that can resolve safety issues, improve environmental protection, and be effectively applied to carbon fiber processes. [Means for solving the problem]

[0007] According to one aspect of the present invention, a carbon fiber treatment agent composition is provided that disperses a modified polyorganosiloxane in water using a dispersant without using an organic solvent.

[0008] According to another aspect of the present invention, a method for producing a carbon fiber treatment agent is provided, which involves first mixing a modified polyorganosiloxane with a dispersant and then dispersing it in water.

[0009] According to yet another aspect of the present invention, a carbon fiber precursor coated with the carbon fiber treatment agent of the above aspect is provided.

[0010] According to one aspect of the present invention, a carbon fiber treatment agent composition comprising the following is provided. A modified polyorganosiloxane having at least one modifying functional group. A dispersant having a structure shown in the following formula (I), in an amount of 10 wt% to 50 wt% relative to 100 wt% of modified polyorganosiloxane. [ka] In formula (I), R1 represents an aliphatic hydrocarbon, ether chain, or cyclic ether chain having 2 to 10 carbon atoms in a straight, cyclic, or branched chain. R2 represents an aliphatic hydrocarbon, cyclic ether chain, alicyclic hydrocarbon, or aromatic hydrocarbon having 2 to 30 carbon atoms in a straight, cyclic, or branched chain, and being substituted or unsubstituted. X represents alkyl groups, hydroxyl groups, sulfonic acid groups, carboxylic acid groups and their salts, primary amines, secondary amines, tertiary amines and their salts, quaternary ammonium salts, alkyldimethylbenzene quaternary ammonium salts, alkyltrimethyl quaternary ammonium salts, dialkyldimethyl quaternary ammonium salts, ester quaternary ammonium salts, and imidazoline quaternary ammonium salts. m represents an integer from 1 to 10. n represents an integer from 1 to 30. water.

[0011] According to one embodiment of the present invention, the carbon fiber treatment agent composition further comprises 1 wt% to 3 wt% of an auxiliary agent, including a pH adjuster, with respect to 100 wt% of a modified polyorganosiloxane.

[0012] According to one embodiment of the present invention, the functional group equivalent of at least one functional group of the modified polyorganosiloxane is 1000 g / mol to 12000 g / mol, and the viscosity of the modified polyorganosiloxane is 200 mm 2 / s~10000mm 2 It is / s.

[0013] According to one embodiment of the present invention, the dispersant comprises a cationic surfactant, a nonionic surfactant, or a combination thereof, the molecular weight of the dispersant is 150 g / mol to 5000 g / mol, and the HLB value of the dispersant is 9.5 to 14.

[0014] According to another aspect of the present invention, there is provided a method for producing a carbon fiber treatment agent including the following. Performing a preliminary mixing operation on the modified polyorganosiloxane and the dispersant to obtain a premix. Performing a dispersion operation on the premix and water with a weight ratio of water to premix of 5 to 99 to obtain a carbon fiber treatment agent.

[0015] According to an embodiment of the present invention, the preliminary mixing operation includes mixing at a temperature of 20°C to 60°C and a stirring speed of 500 rpm to 3000 rpm for 10 minutes to 60 minutes.

[0016] According to an embodiment of the present invention, the dispersion operation includes adding water and mixing at a temperature of 20°C to 60°C and a stirring speed of 500 rpm to 3000 rpm for 30 minutes to 120 minutes.

[0017] According to an embodiment of the present invention, the emulsion particle size of the carbon fiber treatment agent is smaller than 400 nm.

[0018] According to an embodiment of the present invention, the migration speed of the carbon fiber treatment agent is smaller than 30% / hour.

[0019] According to yet another aspect of the present invention, there is provided a carbon fiber precursor coated with a carbon fiber treatment agent and coated with 0.1 wt% to 5 wt% of the carbon fiber treatment agent.

Effects of the Invention

[0020] By applying the carbon fiber treatment agent composition, the carbon fiber treatment agent, the manufacturing method thereof, and the carbon fiber precursor of the present invention, without using an organic solvent, using a dispersant having a specific structure, the modified polyorganosiloxane is dispersed in water, reducing pollution problems, improving safety, and improving the emulsion stability and thermal stability of the carbon fiber treatment agent.

Modes for Carrying Out the Invention

[0021] Hereinafter, the production and use of the embodiments of the present invention will be examined in detail. However, it should be understood that the embodiments provide many applicable inventive concepts that can be implemented in various specific contexts. The specific embodiments discussed are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0022] The terms "around", "about", "approximately" or "substantially" used in the present invention generally represent within 20%, or within 10%, or within 5% of the said numerical value or range.

[0023] As described above, the present invention provides a carbon fiber treatment agent composition, a carbon fiber treatment agent, a method for producing the same, and a carbon fiber precursor. Without using an organic solvent, a dispersant having a specific structure is used to disperse a modified polyorganosiloxane in water, which can reduce pollution problems, improve safety, and improve the emulsion stability and thermal stability of the carbon fiber treatment agent.

[0024] The carbon fiber treatment agent composition according to the present invention includes a modified polyorganosiloxane, a dispersant, and water. The modified polyorganosiloxane is modified with at least one modified functional group. In some embodiments, the modified functional group may be, for example, an amine group, an epoxy group or a carboxylic acid group, which helps to improve the properties of the emulsion, such as water solubility and compatibility. In some embodiments, the functional group equivalent of the modified polyorganosiloxane is about 1000 g / mol to about 12000 g / mol. When the functional group equivalent of the modified polyorganosiloxane after modification is within the above range, the modified polyorganosiloxane has appropriate reactivity and can crosslink to form a film.

[0025] Modified polyorganosiloxanes are special silicone oils that possess the properties of dimethyl silicone oil. Various organic functional groups can be introduced, resulting in properties such as water solubility, compatibility, reactivity with different organic materials, coating properties, and lubricity. Some specific examples of modified polyorganosiloxanes include KF-864, KF-865, KF-868, KF-859, KF-393, KF-860, KF-880, KF-8004, KF-8002, KF-8005, KF-867, KF-869, KF-861, KF-877, X-22-3820W, and X-22-3939A from Shin-Etsu Chemical, and other products from the Mitsubishi Chemical Group. DMS-A11, DMS-A12, DMS-A15, DMS-A21, DMS-A31, DMS-A32, DMS-A35, DMS-A32R, DMS-A211, DMS-A214, AMS-A132, AMS-A152, AMS-A162, AMS-A163, AMS-A191, AMS-A1203, AMS-A233, AMS-A2202, AMS-42, ATM-1112, ATM-1322, UBS-0541 and UBS-0822, etc. manufactured by Dow Corning (DOW Group), or other manufacturers. The DOWSIL series manufactured by CORNING may also be used, such as BY16-205, BY-16-849, FZ-3710, FZ-3760, FZ-3785, BY16-891, and FZ-3789.

[0026] In some examples, the viscosity of the modified polyorganosiloxane was approximately 200 mm². 2 / s~approx.10000mm 2 The viscosity is / s and is determined when combined with a dispersant. Modified polyorganosiloxanes, when having the aforementioned viscosity range, readily achieve an emulsified state with dispersants and disperse in water.

[0027] In some examples, the amount of dispersant is about 10 wt% to 50 wt%, preferably about 20 wt% to 45 wt%, relative to 100 wt% of modified polyorganosiloxane. If the amount of dispersant used is too low (e.g., less than 10 wt%), it will affect the emulsifying effect and emulsion stability of the modified polyorganosiloxane. Conversely, if the amount of dispersant used is too high (e.g., more than 50 wt%), it will affect the effect of the carbon fiber treatment agent and cause a decrease in the thermal stability of the carbon fiber treatment agent. The choice of dispersant affects the emulsifying stability and thermal stability of the carbon fiber treatment agent. The dispersant has the structure shown in the following formula (I). [ka]

[0028] In the above formula (I), R1 represents an aliphatic hydrocarbon, ether chain, or cyclic ether chain having 2 to 10 carbon atoms in a straight, cyclic, or branched chain; R2 represents an aliphatic hydrocarbon, cyclic ether chain, alicyclic hydrocarbon, or aromatic hydrocarbon having 2 to 30 carbon atoms in a straight, cyclic, or branched chain, and being substituted or unsubstituted; X represents alkyl groups, hydroxyl groups, sulfonic acid groups, carboxylic acid groups and their salts, primary amines, secondary amines, tertiary amines and their salts, quaternary ammonium salts, alkyldimethylbenzene quaternary ammonium salts, alkyltrimethyl quaternary ammonium salts, dialkyldimethyl quaternary ammonium salts, ester quaternary ammonium salts, imidazoline quaternary ammonium salts; m represents an integer from 1 to 10; and n represents an integer from 1 to 30.

[0029] In some embodiments, the dispersant may be a cationic surfactant, a nonionic surfactant, or a combination thereof. In some specific examples, the cationic surfactant includes primary amines, secondary amines, tertiary amines and their salts, quaternary ammonium salts, alkyldimethylbenzene quaternary ammonium salts, alkyltrimethyl quaternary ammonium salts, dialkyldimethyl quaternary ammonium salts, ester quaternary ammonium salts, imidazoline quaternary ammonium salt dispersants or surfactants, or combinations thereof. For example, the cationic surfactant may be SINONATE SH50, SINONATE 962SF, SINONATE 960SF from Chunichi Synthetic Chemical Co., Ltd., or Disponil LDBS 19, Disponil LDBS 25, Disponil LDBS 55 from BASF Ltd.

[0030] In some specific examples, nonionic surfactants include higher alcohol ethylene oxide additives, copolymers of polyoxyethylene ether and polyoxypropylene ether, long-chain enols, copolymers of long-chain polyoxyethylene ether and polyoxypropylene ether, polyethylene glycol styrene-aromatic ethers, polyethylene glycol octylphenyl ether, polyethylene glycol nonylphenyl ether, polyethylene glycol stearate, polyethylene glycol bisphenol A derivatives, or combinations thereof. For example, the nonionic surfactant may be the SINOPOL series from Chunichi Synthetic Chemical Co., Ltd., such as SINOPOL1303, SINOPOL1305, SINOPOL1306, SINOPOL1307, SINOPOL1309, SINOPOL1310, SINOPOL1315, SINOPOL1802, SINOPOL1803, SINOPOL1805, SINOPOL1807, SINOPOL1815, SINOPOL1816, SINOPOL1820, SINOPOL1822, SINOPOL18, or Lutensol AT11, Lutensol AT18, Lutensol AT25, Lutensol AT400, Lutensol AT50 from BASF Co., Ltd.

[0031] In some examples, the molecular weight of the dispersant is about 150 g / mol to about 5000 g / mol, preferably about 150 g / mol to about 2000 g / mol. In some examples, the HLB value of the dispersant is about 9.5 to about 14. When the molecular weight and / or HLB value of the dispersant are within the aforementioned range, it helps to improve the dispersibility of the modified polyorganosiloxane.

[0032] In some embodiments, the carbon fiber treatment agent composition may selectively include auxiliary agents, such as pH adjusters including formic acid, acetic acid, propionic acid, lactic acid, or citric acid. In some embodiments, the auxiliary agent is present in an amount of 1 wt% to 3 wt% relative to 100 wt% modified polyorganosiloxane. Adding the aforementioned amounts of auxiliary agents can be used to adjust the pH value of the carbon fiber treatment agent, ionize it, and improve its emulsification stability. In some embodiments, the pH value of the carbon fiber treatment agent must be adjusted to about 6 to about 8.

[0033] The present invention further provides a method for producing a carbon fiber treatment agent. The method includes first performing a premixing operation on a modified polyorganosiloxane and a dispersant to obtain a premix. In some embodiments, the premixing operation includes mixing the modified polyorganosiloxane and the dispersant for about 10 minutes to about 60 minutes at a temperature of about 20°C to about 60°C and a stirring speed of about 500 rpm to about 3000 rpm. The premixing operation using the above conditions helps to uniformly mix the modified polyorganosiloxane and the dispersant.

[0034] The method then involves a dispersion operation in the premix and water to obtain the carbon fiber treatment agent. In some examples, the weight ratio of water to premix is ​​about 6 to about 9. In some examples, the dispersion operation involves adding water and mixing for about 30 minutes to about 120 minutes at a temperature of about 20°C to about 60°C and a stirring speed of about 500 rpm to about 3000 rpm. In the aforementioned examples, the dropping rate of water is about 0.1 mL / min to about 10 mL / min. The premixing operation using the aforementioned conditions helps to effectively disperse the modified polyorganosiloxane in water. In some examples, auxiliary agents may be added during the premixing and / or dispersion operation.

[0035] The carbon fiber treatment agent produced by the above carbon fiber treatment agent composition and method can have good emulsification stability. Emulsification stability can be evaluated based on emulsion particle size and migration speed. In some examples, the emulsion particle size of the carbon fiber treatment agent is less than about 400 nm, preferably less than about 150 nm, and more preferably less than about 100 nm. In some examples, the migration speed of the carbon fiber treatment agent is less than about 30% / hour, preferably less than about 29.5% / hour.

[0036] In some examples, a carbon fiber tow is treated with a carbon fiber treatment agent at room temperature to obtain a carbon fiber precursor, and the carbon fiber precursor is coated with approximately 0.1 wt% to 5 wt% of the carbon fiber treatment agent. Subsequent steps such as heating, stretching, carbonization, pickling, electrolysis, washing, and drying are performed on the carbon fiber precursor to produce carbon fibers.

[0037] The following examples illustrate the applications of the present invention, but these are not intended to limit the invention, and those skilled in the art can make various modifications and changes without departing from its spirit and scope.

[0038] Manufacturing of carbon fiber treatment agents

[0039] Example 1

[0040] A premix was prepared by mixing amino-modified polyorganosiloxane DAS-1 and dispersant C3, and performing a preliminary mixing operation at a rotation speed of 500 rpm to 3000 rpm. The amount of dispersant C3 used was 35 wt% for every 100 wt% of amino-modified polyorganosiloxane DAS-1 used. The functional group equivalent of amino-modified polyorganosiloxane DAS-1 was 2000, and dispersant C3 is a cationic surfactant. The physical properties of dispersant C3 are shown in detail in Table 1 and will not be explained separately here.

[0041] Then, while maintaining a rotation speed of 500 rpm to 10000 rpm, deionized water was added dropwise at a rate of 0.1 mL / min to 10 mL / min, in an amount 2 to 5 times the weight of the premix, to obtain an aqueous dispersion of amino-modified polyorganosiloxane. Next, while maintaining a rotation speed of 500 rpm to 10000 rpm, deionized water and an auxiliary agent were added dropwise in an amount 5 to 99 times the weight of the aqueous dispersion of amino-modified polyorganosiloxane to obtain a carbon fiber treatment agent.

[0042] Next, the carbon fiber tow was subjected to an oil treatment step using the obtained carbon fiber treatment agent to obtain a carbon fiber precursor.

[0043] Examples 2-9 and Comparative Examples 1-2

[0044] Examples 2-9 and Comparative Example 1 produce carbon fiber treatment agents using the same process as Example 1, but differ in that the amino-modified polyorganosiloxane and dispersant used are different. In Comparative Example 1, dispersant A1 is disodium lauryl alcohol ether succinate (anionic surfactant). The functional group equivalent of the amino-modified polyorganosiloxane DAS-2 was 6000. The physical properties of the dispersants used in Examples 2-9 and Comparative Example 1 are described in detail in Table 1. Dispersants C1-C3 were selected from the group consisting of one of sulfonic acid esters, alkylphenol ether sulfates, alkylbenzene sulfonate sodium salts, and combinations thereof, and dispersants N1-N3 were selected from the group consisting of one of fatty alcohol polyoxyethylene ethers and fatty alcohol polyoxyethylene glycol ethers, and combinations thereof. The amounts of each component used in Examples 2-9 and Comparative Examples 1 and 2 are shown in detail in Tables 2 and 3, and will not be explained separately here.

[0045] Comparative Example 2 did not use a carbon fiber treatment agent in the oil treatment step, so only the evaluation results for the carbon fibers were available.

[0046] Evaluation method

[0047] Emulsion particle size of carbon fiber treatment agent

[0048] The emulsion particle size of the carbon fiber treatment agent was measured using a particle size analyzer (Brookhaven, model 90Plus / BI-MAS) to evaluate the emulsification stability of the carbon fiber treatment agent. A smaller emulsion particle size indicates a better emulsification effect and good emulsification stability. The evaluation results of the emulsion particle size for Examples 1-9 and Comparative Example 1 are shown in Tables 2 and 3.

[0049] Movement speed of carbon fiber treatment agent

[0050] The change in permeability of the carbon fiber treatment agent was measured using a stability measuring device (LUMiSizer 651, manufactured by LUM Corporation), and the migration speed of the emulsion particles in the carbon fiber treatment agent (in units of % / hour) was calculated to further evaluate the emulsification stability of the carbon fiber treatment agent. A slower migration speed indicates better emulsification stability of the carbon fiber treatment agent, allowing for long-term storage. The evaluation results of the migration speed for Examples 1-9 and Comparative Example 1 are shown in Tables 2 and 3.

[0051] thermal stability

[0052] A thermogravimetric analyzer (TGA) (Waters, model Q50) was used to measure the thermal gravimetric loss of the slurry layer formed with the carbon fiber treatment agent at 275°C and 430°C after 30 minutes, relative to the initial weight of the carbon fiber treatment agent (100 wt%), in a nitrogen gas environment. A smaller thermal gravimetric loss indicated better thermal stability of the carbon fiber treatment agent. The evaluation results of the thermal stability of Examples 1-9 and Comparative Example 1 are shown in Tables 2 and 3.

[0053] Oil content weight ratio

[0054] Carbon fiber precursors were extracted using the Soxhlet extraction method, and 10 grams of carbon fiber precursors were extracted with a solvent for 4 hours. The solvent was then evaporated to dryness, and the thermal weight loss was measured by TGA. The evaluation results of the oil content weight ratio for Examples 1-9 and Comparative Example 1 are shown in Tables 2 and 3.

[0055] Fraying and thread breakage

[0056] A 100m length of yarn was taken, and the number of times fraying or yarn breakage occurred was visually inspected and evaluated according to the following criteria. The evaluation results for fraying and yarn breakage for Examples 1-9 and Comparative Examples 1 and 2 are shown in Tables 2 and 3. ○: No pilling or thread breakage. △: The number of instances of pilling and thread breakage is 1 to 3. ×: The number of instances of pilling and thread breakage is greater than 4.

[0057] [Table 1]

[0058] [Table 2]

[0059] [Table 3]

[0060] According to the above examples, in Examples 1 to 9, a carbon fiber treatment agent produced from a cationic surfactant and / or nonionic surfactant having a specific content having the structure of formula (I) and an amino-modified polyorganosiloxane can indeed be used to achieve good emulsification stability and thermal stability. Furthermore, carbon fiber precursors coated with the carbon fiber treatment agents of Examples 1 to 9 can reduce fluffing and yarn breakage during high-temperature treatment.

[0061] In contrast, Comparative Example 1 uses an anionic surfactant, which means that the emulsion particles of the carbon fiber treatment agent produced are large and move quickly, resulting in poor emulsification and poor emulsion stability. Furthermore, the carbon fiber treatment agent in Comparative Example 1 has a large thermal weight loss, meaning that its thermal stability is poor. Moreover, regardless of whether Comparative Example 1 used an anionic surfactant or Comparative Example 2 did not use a carbon fiber treatment agent, the carbon fibers produced had a significantly higher number of fluff and thread breaks.

[0062] Therefore, the carbon fiber treatment agent composition, carbon fiber treatment agent, method for producing the same, and carbon fiber precursor according to the present invention can disperse modified polyorganosiloxane in water using a dispersant having a specific structure without using organic solvents, thereby reducing contamination problems, improving safety, and improving the emulsification stability and thermal stability of the carbon fiber treatment agent.

[0063] Although the present invention has been disclosed in several embodiments, this is not intended to limit the invention. Those skilled in the art can make various modifications and alterations to the invention without departing from its spirit and scope; therefore, the scope of protection of the present invention should be based on the claims.

Claims

1. A carbon fiber treatment agent composition, A modified polyorganosiloxane having at least one modified functional group, The modified polyorganosiloxane is present in an amount of 10 wt% to 50 wt%, and has the structure shown in the following formula (I): 【Chemistry 1】 In the above formula (I), R １ R represents an aliphatic hydrocarbon, ether chain, or cyclic ether chain having a straight, cyclic, or branched chain with 2 to 10 carbon atoms. ２ X represents a dispersant having a linear, cyclic, or branched chain with 2 to 30 carbon atoms, and being substituted or unsubstituted aliphatic hydrocarbons, cyclic ether chains, alicyclic hydrocarbons, or aromatic hydrocarbons; X represents alkyl groups, hydroxyl groups, sulfonic acid groups, carboxylic acid groups and their salts, primary amines, secondary amines, tertiary amines and their salts, quaternary ammonium salts, alkyldimethylbenzene quaternary ammonium salts, alkyltrimethyl quaternary ammonium salts, dialkyldimethyl quaternary ammonium salts, ester quaternary ammonium salts, imidazoline quaternary ammonium salts; m represents an integer from 1 to 10, and n represents an integer from 1 to 30. Water and, A carbon fiber treatment agent composition containing the following:

2. The carbon fiber treatment agent composition according to claim 1, further comprising 1 wt% to 3 wt% of an auxiliary agent containing a pH adjuster, relative to 100 wt% of the modified polyorganosiloxane.

3. The functional group equivalent of at least one modified functional group of the modified polyorganosiloxane is 1,000 g / mol to 12,000 g / mol, and the viscosity of the modified polyorganosiloxane is 200 mm². ２ / s~10000mm ２ The carbon fiber treatment agent composition according to claim 1, wherein the value is / s.

4. The carbon fiber treatment agent composition according to claim 1, wherein the dispersant comprises a cationic surfactant, a nonionic surfactant, or a combination thereof, the molecular weight of the dispersant is 150 g / mol to 5000 g / mol, and the HLB value of the dispersant is 9.5 to 14.

5. A method for producing a carbon fiber treatment agent, The modified polyorganosiloxane and the dispersant are pre-mixed to obtain a premix, The carbon fiber treatment agent is obtained by dispersing the premix with water in a weight ratio of 5 to 99 between the water and the premix. A method for producing a carbon fiber treatment agent containing [the specified ingredient].

6. The method for producing a carbon fiber treatment agent according to claim 5, wherein the pre-mixing operation comprises mixing at a temperature of 20°C to 60°C and a stirring speed of 500 rpm to 3000 rpm for 10 to 60 minutes.

7. The method for producing a carbon fiber treatment agent according to claim 5, wherein the dispersion operation includes adding the water at a temperature of 20°C to 60°C and a stirring speed of 500 rpm to 3000 rpm, and mixing for 30 minutes to 120 minutes.

8. The method for producing a carbon fiber treatment agent according to claim 5, wherein the emulsion particle size of the carbon fiber treatment agent is smaller than 400 nm.

9. The method for producing a carbon fiber treatment agent according to claim 5, wherein the migration speed of the carbon fiber treatment agent is less than 30% / hour.

10. A carbon fiber precursor coated with the carbon fiber treatment agent by the method for producing the carbon fiber treatment agent according to claim 5, wherein the carbon fiber precursor is coated with 0.1 wt% to 5 wt% of the carbon fiber treatment agent.

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