Activated carbon dispersion and use thereof

Abstract

The application discloses an activated carbon dispersion body, which comprises activated carbon and an alcohol-based solvent, wherein the activated carbon is a wooden activated carbon modified by a quaternary ammonium salt linkage, and the general structure of the quaternary ammonium salt is shown as formula (I); wherein at least one of R1, R2, R3 and R4 is an alcohol hydroxyl group with 2-4 carbons, at least one is a long-chain alkyl group or a substituted alkyl group with more than 8 carbon atoms, and the substituent group is an alkyl group, a phenyl group or an aralkyl group; and the rest is an alkyl group. The activated carbon dispersion body can be applied to the preparation of polyester fibers through polyester dope spinning. The activated carbon dispersion body has good dispersibility, and the polyester fibers prepared from the activated carbon dispersion body have good moisture absorption, sweat releasing and antibacterial properties.

Description

Technical Field

[0001] This invention relates to the field of inorganic material dispersions and their modification of synthetic fibers, specifically to an activated carbon dispersion and its application in solution spinning. Background Technology

[0002] Polyester fiber, also known as polyester fiber, is a type of synthetic fiber. It possesses excellent properties such as high modulus, good elasticity, shape retention, and high heat resistance, making it widely used in clothing and home furnishings. However, due to the dense packing and high crystallinity of polyester fiber macromolecules, water molecules have difficulty penetrating it, resulting in very poor hydrophilicity. It is a typical hydrophobic fiber, with a moisture regain of only 0.4% to 0.5% under standard conditions. When wearing hydrophobic fiber fabrics such as polyester in humid and hot environments, the poor hydrophilicity and moisture absorption of the fabric cause wet clothing to stick to the skin, creating a sticky and uncomfortable feeling and reducing the overall comfort of the garment.

[0003] There are three ways to improve the moisture-wicking properties of synthetic fiber fabrics: first, by altering the fiber cross-sectional structure, utilizing the capillary action created by the micro-grooves on the fiber surface to allow sweat to be absorbed, transported, diffused, and evaporated; second, by introducing a large number of hydrophilic groups into the basic structure of macromolecules through polymerization or copolymerization; and third, by treating the surface of hydrophobic synthetic fibers with hydrophilic agents, i.e., by adding hydrophilic finishing agents to the fiber surface. However, each of these methods has its drawbacks. The high cost of profiled fibers limits their application; the introduction of hydrophilic groups into the macromolecular structure through polymerization or copolymerization is prone to decomposition during high-temperature melt spinning, making it difficult to achieve the required moisture-wicking performance; and the method of adding hydrophilic finishing agents to the fiber surface suffers from insufficient fastness of the finishing agents, failing to maintain the moisture-wicking effect for long. Furthermore, while conventional moisture-wicking fabrics can quickly remove moisture from the body, the humid and hot environment and the grooves in the fibers also provide conditions for bacterial growth and reproduction, resulting in insufficient safety. The microporous structure of activated carbon enables it to regulate moisture balance, resulting in fabrics with excellent moisture absorption, quick drying, heat retention, and warmth retention properties. Activated carbon itself also possesses antibacterial and bactericidal effects, providing a new pathway for moisture absorption, perspiration wicking, and antibacterial properties in fabrics. Bio-based activated carbon uses biomass as raw material and is produced through a high-temperature, high-pressure process. It contains no harmful chemicals, enabling sustainable production and exhibiting good environmental performance, making it a preferred choice for synthetic fiber clothing.

[0004] CN116732635A discloses a coffee charcoal aerogel thermally sensitive polyester fiber and its preparation process. To solve the dispersion problem of coffee charcoal, porous silica wet gel, coffee charcoal, and agar wet gel are mixed and freeze-dried to obtain an aerogel. It claims that the resulting coffee charcoal aerogel thermally sensitive polyester fiber has good moisture absorption and heat generation effects. However, coffee charcoal is mostly nano-sized activated carbon with small particle size. It is contained in the pores of the prepared aerogel, and the path for moisture to reach through the coffee charcoal is long, making it difficult to achieve a sweating effect. CN1807714A discloses a bamboo charcoal fiber prepared by mixing polypropylene, polyester, or nylon as a carrier with bamboo charcoal micropowder. The preparation of bamboo charcoal fiber involves drying bamboo charcoal micropowder, stirring, adding a coupling agent for activation, adding a carrier, surfactant, and dispersant, and obtaining bamboo charcoal micropowder concentrated masterbatch through a granulation mechanism. The bamboo charcoal micropowder concentrated masterbatch is mixed with the carrier and melt-spun to obtain bamboo charcoal fiber. The bamboo charcoal fiber has the advantages of good adsorption and deodorization effects and good antibacterial and bactericidal effects. As a type of charcoal, it mainly has a molecular structure similar to cellulose and hemicellulose. The surface of the activated carbon produced contains a large number of oxygen-containing groups such as hydroxyl and carboxyl groups. In addition, the pore structure of charcoal is mainly composed of mesopores and macropores, with a small specific surface area, resulting in relatively poor antibacterial and moisture-wicking effects.

[0005] CN110523383A discloses a hydrophobically modified activated carbon for adsorbing organic matter, which employs esterification and etherification modification to reduce the hydrophilic carboxyl and hydroxyl functional groups on the activated carbon surface and to shrink pores by generating esters and ethers. This approach aims at hydrophobic modification but fails to improve the moisture absorption, wicking, and antibacterial properties of activated carbon. Furthermore, esterification and etherification modification may clog the activated carbon pores, reducing adsorption performance. To improve the antibacterial properties of inorganic particles, KR20080085428A discloses a silver-doped antibacterial porous adsorbent, which is selected from one or more of activated carbon, diatomaceous earth, zeolite, silica gel, and bentonite. JP2000016901A discloses a powder capable of maintaining its antibacterial effect for a long time. This antibacterial powder is an antibacterial agent composed of anionic compounds, hydrophilic polymers, and quaternary ammonium salts with antibacterial effects, supported by a porous carrier. The porous support includes activated carbon, and the quaternary ammonium salt has N-position substituents that are all saturated or unsaturated 1-30C aliphatic hydrocarbons or aralkyl groups, and its counter ion is a halogen.

[0006] CN106280317A discloses a method of first modifying the surface of nano-titanium dioxide with a coupling agent, and then grafting organic fluorine and quaternary ammonium salt onto the surface of the modified particles. The organic fluorine promotes the uniform and stable dispersion of inorganic particles in PET substrate and polyester spinning solution, while the quaternary ammonium salt with antibacterial function can synergistically improve the antibacterial properties of colored polyester yarn with nano-titanium dioxide.

[0007] Based on the publicly available technologies, there is currently no effective method to enhance the moisture-wicking and antibacterial properties of hydrophobic fibers using activated carbon. Therefore, it is necessary to find a technical means to improve the dispersion of activated carbon on polyester fibers, thereby enhancing the moisture-wicking and antibacterial properties of the polyester fibers. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the present invention aims to provide an activated carbon dispersion with good dispersibility, and polyester fibers obtained from the activated carbon dispersion have good moisture absorption, perspiration wicking and antibacterial properties.

[0009] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0010] This invention provides an activated carbon dispersion comprising activated carbon and an alcohol-based solvent, wherein the activated carbon is lignocellulosic activated carbon modified by quaternary ammonium salt bonding, and the general structural formula of the quaternary ammonium salt is shown in formula (I):

[0011]

[0012] Among them, at least one of R1, R2, R3 and R4 is an alcohol hydroxyl group having 2-4 carbons, at least one of them is a long-chain alkyl or substituted alkyl having 8 or more carbon atoms, and the substituent is alkyl, phenyl or aralkyl; the rest are alkyl.

[0013] The quaternary ammonium salts can be commercially available products or prepared according to publicly available documents, such as: Wang Yuxia, Zhao Jin, Sun Xinqi, et al. Synthesis of N-piperazinylalkylamide compounds, their interaction with DNA, and physiological activity; Sun Jifu, Li Qiuxiao, Li Yunling, et al. Synthesis and performance study of diecrylmethylhydroxyethylammonium chloride. Common quaternary ammonium salts include dodecyl(2-hydroxyethyl)dimethylammonium bromide, N,N-dimethyl-N-(2-hydroxyethyl)hexadecyl quaternary ammonium phosphate, dodecyl diecrylmethylmethylammonium chloride, dodecyl dimethylhydroxyethyl quaternary ammonium salt, diecrylmethylhydroxyethylammonium acetate, octadecyl dimethylhydroxyethylammonium chloride, etc. The counter anions of the hydroxyl quaternary ammonium salts can be chloride ions, acetate ions, sulfonate ions, phosphonate ions, phosphate ions, etc. Common wood-based activated carbons include bamboo charcoal (made from bamboo), fruit shell charcoal (made from walnut shells or apricot kernels), coconut shell charcoal, and coffee charcoal (made from coffee grounds), etc. The alcohol-based solvent used can be ethylene glycol, propylene glycol, butanediol, etc.

[0014] Activated carbon contains numerous oxygen-containing groups such as hydroxyl and carboxyl groups on its surface. Hydroxy quaternary ammonium salts undergo esterification and etherification with these hydroxyl and carboxyl groups, bonding to the surface of the activated carbon. The long-chain alkyl groups and the resulting ester groups further enhance the compatibility of the activated carbon in the preparation of ester-based fibers, significantly improving its dispersibility within the fibers. During storage, particulate matter easily agglomerates due to electrostatic interactions. Ammonium salts can form hydrogen bonds or electrostatic interactions on the activated carbon surface, reducing agglomeration and improving the dispersion stability. Furthermore, the hydrophilicity of quaternary ammonium salts enhances the hydrophilicity of activated carbon, and as a commonly used antibacterial component, it further strengthens the antibacterial properties of the activated carbon.

[0015] Furthermore, at least one of R1, R2, R3 and R4 is a long-chain alkyl or substituted alkyl having 12-16 carbon atoms.

[0016] Furthermore, the quaternary ammonium salt has a counterion A - It can be a halide ion, acetate ion, sulfonate ion, or phosphate ion.

[0017] Furthermore, at least two of R1, R2, R3 and R4 are alcohol hydroxyl groups having 2-4 carbons, or at least two of R1, R2, R3 and R4 are long-chain alkyl or substituted alkyl groups having 8-10 carbon atoms.

[0018] Furthermore, two of R1, R2, R3 and R4 are alcohol hydroxyl groups having 2-4 carbons, and at least one of R1, R2, R3 and R4 is a long-chain alkyl or substituted alkyl having 12-18 carbon atoms.

[0019] Preferably, the quaternary ammonium salt is at least one of dialcylhydroxyethylmethylammonium chloride, dialcylmethylhydroxyethylammonium acetate, and dialcylmethylhydroxypropylammonium chloride.

[0020] Preferably, the activated carbon is coffee charcoal. Coffee charcoal is obtained from coffee grounds, and the raw material is abundant. Coffee grounds are processed by removing oils, calcining to form crystals, and then grinding them into powdered activated carbon to obtain coffee charcoal.

[0021] Furthermore, the modification step of the activated carbon includes:

[0022] Step 1: Mix the catalyst, quaternary ammonium salt, and activated carbon, and heat and stir to react;

[0023] Step two: After the reaction, the mixture is cooled to room temperature, then washed, dried, and cooled to obtain the modified activated carbon. The catalyst can be concentrated sulfuric acid, p-toluenesulfonic acid, solid acid, etc., and the reaction temperature can vary depending on the catalyst used and the evaporation and decomposition temperatures of the solvent; there are no particular limitations.

[0024] Furthermore, the alcohol solvent in the activated carbon dispersion is ethylene glycol.

[0025] Furthermore, to improve the heat retention performance of the dispersion during application, the activated carbon dispersion also includes silica aerogel. Based on the total mass of the activated carbon dispersion, the content of wood-based activated carbon is 2-40%, and the content of silica aerogel is 2-40%. In addition, the activated carbon dispersion may also contain pigments, such as carbon black, silica, titanium dioxide, and titanium black.

[0026] Another aspect of the present invention provides an application of an activated carbon dispersion used in polyester dope spinning. In the composition used for polyester dope spinning, the activated carbon, modified by quaternary ammonium salt chemical bonding, accounts for 1-10% by mass, preferably 1.5-7%.

[0027] Furthermore, the polyester dope spinning is ethylene glycol-based color paste dope spinning. In the composition used for ethylene glycol-based color paste dope spinning, the mass percentage of activated carbon modified by quaternary ammonium salt chemical bonding is 1-10%.

[0028] The beneficial effects of this invention are:

[0029] The activated carbon used in the activated carbon dispersion of this invention is modified by quaternary ammonium salt chemical bonding, which improves the hydrophilicity of the activated carbon and enhances its adsorption and antibacterial effects. Furthermore, the activated carbon exhibits good hydrophilicity, enabling rapid wetting and dispersion in alcohol solvents, resulting in good dispersion stability. Moreover, the activated carbon is modified by esterification / etherification with hydroxyl-containing quaternary ammonium salts, and its long-chain alkyl groups provide excellent dispersibility during the polymerization of phthalic acid and alcohols, resulting in fibers with good spinnability. The activated carbon dispersion of this invention exhibits good dispersibility and dispersion stability, and the fibers produced when used in the spinning of alcohol-based color paste dopes possess antibacterial and moisture-wicking properties. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides an activated carbon dispersion comprising activated carbon and an alcohol-based solvent, wherein the activated carbon is wood-based activated carbon modified by quaternary ammonium salt bonding, and the general structural formula of the quaternary ammonium salt is shown in formula (I):

[0032]

[0033] Among them, at least one of R1, R2, R3 and R4 is an alcohol hydroxyl group having 2-4 carbons, at least one of them is a long-chain alkyl or substituted alkyl having 8 or more carbon atoms, and the substituent is alkyl, phenyl or aralkyl; the rest are alkyl.

[0034] The counter anion A of the quaternary ammonium salt - It can be a halide ion, acetate ion, sulfonate ion, or phosphate ion.

[0035] The quaternary ammonium salt is preferably at least one of dialcylhydroxyethylmethylammonium chloride, dialcylmethylhydroxyethylammonium acetate, and dialcylmethylhydroxypropylammonium chloride.

[0036] The activated carbon mentioned is coffee charcoal. Coffee charcoal is obtained from coffee grounds, and the raw material is abundant. After removing oils and calcining, the coffee grounds are made into crystals, which are then ground into powder to form activated carbon. Coffee charcoal also undergoes oxidation activation treatment.

[0037] The modification steps of the activated carbon include:

[0038] Step 1: Mix the catalyst, quaternary ammonium salt, and activated carbon, and heat and stir to react;

[0039] Step two: After the reaction, the mixture is cooled to room temperature, then washed, dried, and cooled to obtain the modified activated carbon. The catalyst can be concentrated sulfuric acid, p-toluenesulfonic acid, solid acid, etc., and the reaction temperature can vary depending on the catalyst used and the evaporation and decomposition temperatures of the solvent; there are no particular limitations.

[0040] The alcohol-based solvent in the activated carbon dispersion is preferably ethylene glycol.

[0041] To improve the heat retention performance of the dispersion during application, the activated carbon dispersion also includes silica aerogel. Based on the total mass of the activated carbon dispersion, the content of wood-based activated carbon is 2-40%, and the content of silica aerogel is 2-40%. In addition, the activated carbon dispersion may also contain pigments, such as carbon black, silica, titanium dioxide, and titanium black.

[0042] The activated carbon dispersion can be applied to polyester dope spinning. In the composition used for polyester dope spinning, the activated carbon modified with quaternary ammonium salts accounts for 1-10% by mass, preferably 1.5-7%. The polyester dope spinning is preferably ethylene glycol-based color paste dope spinning.

[0043] The present invention will be further described in detail below through specific embodiments.

[0044] Unless otherwise specified, all substances used in the embodiments are commercially available products.

[0045] Preparation of two hydroxy quaternary ammonium salts

[0046] Dimethyl octyl tertiary amine and dimethyl heptyl tertiary amine were added separately to a 1:1 mixture of isopropanol and water. The mixture was stirred and heated to reflux temperature. Chloroethanol was added dropwise until the conversion rate of the tertiary amine reached 98% as determined by acid-base titration. The solvent was then distilled off under reduced pressure. The residue was dissolved in pure water, extracted twice with diethyl ether, and then distilled under reduced pressure and dried under vacuum to obtain the products: dimethyl hydroxyethyl octyl ammonium chloride and dimethyl hydroxyethyl heptyl ammonium chloride.

[0047] Preparation of modified coffee charcoal

[0048] Ten parts of oxidized and activated coffee char, two parts of quaternary ammonium salt (net weight after removing solvent) and 0.04 parts of p-toluenesulfonic acid were added to xylene and stirred at 70°C. The mixture was reacted under continuous purging of dry nitrogen gas, cooled and filtered, then washed three times with pure water and vacuum dried to obtain modified coffee char.

[0049] The oxidation and activation steps of coffee charcoal are as follows: 10 parts by mass of coffee charcoal (200 mesh, iodine value 600) are added to 100 parts by mass of acid solution, wherein the volume ratio of concentrated sulfuric acid to concentrated nitric acid is 3:1. The mixture is immersed at 30°C for 2 hours, washed with water until neutral, filtered and dried to obtain coffee charcoal with oxygen-containing groups on the surface.

[0050] Preparation Examples 1-8 and Comparative Preparation Example 1 used different quaternary ammonium salts, resulting in modified coffee charcoal 1-9. Among them:

[0051] The quaternary ammonium salt used in Preparation Example 1 was octylhydroxyethyldimethylammonium chloride;

[0052] In Preparation Example 2, the quaternary ammonium salt used was decylmethylhydroxyethylammonium chloride (50%, isopropanol solution);

[0053] In Preparation Example 3, the quaternary ammonium salt used was diecrylmethylhydroxypropylammonium chloride (50%, ethanol solution);

[0054] The quaternary ammonium salt used in Preparation Example 4 was dodecylhydroxyethyl dimethylammonium bromide;

[0055] The quaternary ammonium salt used in Preparation Example 5 was dodecylhydroxyethyl dimethyl ammonium chloride;

[0056] The quaternary ammonium salt used in Preparation Example 6 was dodecyl bis(2-hydroxyethyl)benzyl ammonium chloride;

[0057] The quaternary ammonium salt used in Preparation Example 7 was hexadecylhydroxyethyl dimethyl quaternary ammonium phosphate;

[0058] The quaternary ammonium salt used in Preparation Example 8 was octadecylbis(2-hydroxyethyl)methylammonium chloride;

[0059] The quaternary ammonium salt used in Comparative Preparation Example 1 was heptyl hydroxyethyl dimethyl ammonium chloride.

[0060] The solvent-containing quaternary ammonium salt is first desolventized by vacuum distillation, then washed three times with petroleum ether, and finally dried under vacuum before use.

[0061] Preparation of coated coffee charcoal

[0062] The oxidized and activated coffee char was added to a 1 mol / L quaternary ammonium salt solution, stirred and impregnated at room temperature for 24 h, filtered, washed, and dried to obtain quaternary ammonium salt-coated activated carbon. The quaternary ammonium salts used were dodecylhydroxyethyl dimethyl ammonium chloride and dodecyltrimethyl ammonium chloride, respectively, resulting in modified coffee char 10 and 11.

[0063] Preparation of coffee charcoal dispersion

[0064] According to the mass ratio in Table 1, coffee charcoal, silica aerogel (Cabot P100), and surfactant were dispersed in ethylene glycol, and then dispersed and ground to obtain coffee charcoal dispersions, resulting in coffee charcoal dispersions numbered 1 to 13.

[0065] Table 1. Proportioning of Coffee Charcoal Dispersion

[0066]

[0067]

[0068] The testing standards for coffee charcoal dispersions are as follows:

[0069] Particle size distribution test: The particle size of the coffee charcoal dispersion and the particles after 30 days of storage were tested according to the standard GB / T 29022-2021 "Particle Size Analysis - Dynamic Light Scattering (DLS)". In the test results, D50 represents the minimum particle size through which 50% of the measured particles can pass, and D90 represents the minimum particle size through which 90% of the measured particles can pass. The results are shown in Table 2.

[0070] Table 2. Performance test results of coffee charcoal dispersion

[0071]

[0072] As shown in Table 2 above, the particle sizes D50 and D90 of coffee charcoal dispersions 1-8 and 13 were relatively small and showed little change after 30 days of storage, indicating that the dispersions prepared in this invention have stable performance. The D50 and D90 particle sizes of coffee charcoal dispersion 9 were significantly larger than those of dispersions 1-8 and 13. Coffee charcoal dispersions 10 and 11 used coffee charcoal coated with different substances, and their D50 and D90 particle sizes were also larger than those of the esterified modified coffee charcoal dispersions 1-9 and 13. The coffee charcoal in dispersion 12, which did not undergo coating and bonding modification treatment, showed aggregation and stratification after 30 days of storage, making particle size determination impossible.

[0073] Preparation and performance testing of polyester fibers

[0074] Coffee charcoal dispersions numbered 1-13 were added to a polyester reaction vessel (wherein the coffee charcoal dispersions accounted for 2% of the total mass of terephthalic acid and ethylene glycol, the molar ratio of terephthalic acid and ethylene glycol was 1:1.2, and the catalyst tetrabutyl titanate accounted for 0.2% of the mass of terephthalic acid). After esterification, pre-condensation, and final condensation, a polyester melt was obtained. Then, the melt was spun to obtain polyester fibers, and the polyester fibers were woven to obtain polyester fabrics, which correspond to numbers 1-13.

[0075] Water droplet diffusion time and drying rate: The water droplet diffusion time and drying rate of the fabric were tested according to the test method specified in standard GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method".

[0076] Moisture regain: The moisture regain of polyester fibers was tested according to the test method specified in the external cold weighing method in standard GB / T 6503-2017 "Test Method for Moisture Regain of Chemical Fibers".

[0077] Water droplet diffusion time and drying rate: The water droplet diffusion time and drying rate of the fabric were tested according to the test method specified in standard GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method".

[0078] Antibacterial properties: The antibacterial properties of polyester fibers against Staphylococcus aureus after 30 washes were tested according to the method specified in GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Vibration method".

[0079] Thermal insulation performance: The thermal resistance of the fabric was tested in accordance with the standard GB / T 11048-2018 "Determination of thermal and moisture resistance of textiles under steady-state conditions for physiological comfort (evaporative hot plate method)".

[0080] Breaking strength and elongation at break: The breaking strength and elongation at break of polyester fibers were tested according to the test methods specified in standard GB / T 14344-2022 "Test Method for Tensile Properties of Chemical Fiber Filaments".

[0081] The performance test results are shown in Table 3.

[0082] Table 3. Performance test results of polyester fabrics

[0083]

[0084] Polyester fibers numbered 6 and 8 exhibit relatively good properties. The quaternary ammonium salts of the activated carbon modifiers used in these fibers have a high number of alcohol hydroxyl groups. The steric hindrance effect of the reaction prevents all hydroxyl groups from being completely esterified during the esterification modification process, resulting in good dispersion and dispersion stability. The hydroxyl groups that did not participate in the modified esterification process participate in the esterification reaction during the pre- and final polycondensation of the alcohol-based slurry, resulting in fibers with good mechanical properties and a high antibacterial rate after washing. Polyester fibers numbered 2 and 3 demonstrate outstanding moisture absorption, perspiration wicking, and antibacterial properties because the activated carbon modifiers used in these fibers have two long-chain alkyl groups. The steric hindrance effect of these long-chain alkyl groups prevents excessive reaction and accumulation of quaternary ammonium salts on the coffee charcoal, thus avoiding blockage of the coffee charcoal's pores. The good adsorption properties of the coffee charcoal contribute to the outstanding moisture absorption, perspiration wicking, and antibacterial properties of the fibers containing it.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0086] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An activated carbon dispersion, characterized in that, The mixture includes activated carbon and an alcohol-based solvent. The activated carbon is wood-based activated carbon modified with quaternary ammonium salt bonding, and the general structural formula of the quaternary ammonium salt is shown in formula (I). （Ⅰ） Among them, at least two of R1, R2, R3 and R4 are alcohol hydroxyl groups with 2-4 carbons, and at least one is a long-chain alkyl or substituted alkyl with more than 8 carbon atoms, wherein the substituent is alkyl, phenyl or aralkyl; the rest are alkyl.

2. The activated carbon dispersion according to claim 1, characterized in that, At least one of R1, R2, R3 and R4 is a long-chain alkyl or substituted alkyl having 12-16 carbon atoms.

3. The activated carbon dispersion according to claim 1, characterized in that, The counter anion A of the quaternary ammonium salt - It can be a halide ion, acetate ion, sulfonate ion, or phosphate ion.

4. The activated carbon dispersion according to claim 1, characterized in that, At least two of R1, R2, R3 and R4 are long-chain alkyl or substituted alkyl groups having 8-10 carbon atoms.

5. The activated carbon dispersion according to claim 4, characterized in that, The quaternary ammonium salt is diecrylhydroxyethylmethylammonium chloride, diecrylmethylhydroxypropylammonium chloride, or diecrylmethylhydroxyethylacetate.

6. The activated carbon dispersion according to claim 4, characterized in that, Two of R1, R2, R3 and R4 are alcohol hydroxyl groups having 2-4 carbons, and at least one of R1, R2, R3 and R4 is a long-chain alkyl or substituted alkyl having 12-18 carbon atoms.

7. The activated carbon dispersion according to claim 1, characterized in that, The activated carbon is coffee charcoal.

8. The activated carbon dispersion according to claim 1, characterized in that, The modification steps of the activated carbon include: Step 1: Mix the catalyst, quaternary ammonium salt, and activated carbon, and heat and stir to react; Step two: After the reaction, the mixture is cooled to room temperature, then washed, dried, and cooled to obtain the modified activated carbon.

9. The activated carbon dispersion according to claim 1, characterized in that, It also includes silica aerogel.

10. The application of an activated carbon dispersion according to any one of claims 1-9, characterized in that, The activated carbon dispersion is used in polyester dope spinning.

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