Coffee carbon master batch, coffee carbon fiber with antibacterial property and preparation method

Abstract

The application discloses coffee carbon master batches, coffee carbon fibers with antibacterial performance and a preparation method, wherein the coffee carbon master batches comprise modified coffee carbon powder and a carrier polymer; the modified coffee carbon powder is obtained by modifying carbonized coffee residue with a phosphate ester dispersant. The coffee carbon is modified by using a phosphate ester, the coffee carbon fibers prepared under the condition of no additional antibacterial agent and low addition amount have excellent antibacterial performance, the fibers have good mechanical strength, and the green recycling of coffee residue and the high performance of fibers are realized.

Description

Technical Field

[0001] This invention relates to the field of functional fiber technology, specifically to a coffee carbon masterbatch, coffee carbon fiber with antibacterial properties, and a preparation method thereof. Background Technology

[0002] Polyester fiber (polyester) is an important synthetic fiber with excellent physical and mechanical properties, such as strength, abrasion resistance, resilience, and dimensional stability, and is widely used in clothing, home textiles, and other fields. However, traditional polyester fibers have some limitations, such as a hydrophobic surface, poor moisture absorption (standard moisture regain is only 0.4%), and poor breathability, resulting in shortcomings in terms of wearing comfort and health. In addition, the poor hydrophilicity of polyester fibers also brings a series of problems to weaving, such as easy accumulation of static electricity, easy attraction of dust, and difficulty in removing oil stains.

[0003] To improve the performance of polyester fibers, researchers have experimented with adding various functional materials, such as biochar, bamboo charcoal, and antibacterial agents. Among these, coffee charcoal, as a novel functional material, has attracted widespread attention due to its high specific surface area, rich porous structure, and excellent thermal properties. Coffee charcoal is produced by calcining waste coffee grounds at high temperatures to optimize the crystal phase and porosity, followed by ultrafine grinding to obtain nanoscale coffee charcoal particles. These particles possess functions and characteristics such as antibacterial and deodorizing properties, moisture absorption and quick drying, negative ion emission, UV resistance, and heat storage and insulation. Recycling and reusing coffee grounds to prepare coffee charcoal polyester fibers helps reduce waste disposal and increase the value of recycled materials, aligning with the green and environmentally friendly circular development concept. However, traditional methods for preparing coffee charcoal polyester fibers suffer from problems such as long production cycles, high energy consumption, and damage to the microporous structure, affecting their heat retention and heating performance.

[0004] Currently, developing polyester fibers with multifunctional properties has become a research hotspot. Textiles with antibacterial properties play a crucial role in inhibiting the growth and reproduction of harmful organisms such as bacteria and viruses, effectively reducing human exposure to pathogens. Therefore, researching coffee fibers with antibacterial properties is of great significance. However, how to achieve low coffee carbon content addition while maintaining good antibacterial effects without compromising fiber properties remains a problem that urgently needs to be solved.

[0005] Several invention patents have been developed to address the challenge of maintaining fiber strength and antibacterial properties while adding low amounts of coffee charcoal. For example, CN118344713A discloses an antimony-free antibacterial, deodorizing, and moisture-wicking polyester masterbatch and its preparation method. This masterbatch, prepared by mixing modified polyester with multifunctional nanomaterials, improves the antibacterial, deodorizing, and moisture-wicking properties of the fiber. However, this patent requires the addition of multifunctional nanomaterials (such as modified nano-zinc oxide antibacterial agents) as antibacterial agents, and there are still shortcomings in optimizing the formulation and process parameters, making it difficult to achieve good antibacterial effects without adding antibacterial agents. CN121321268A discloses a porous polyester fiber and its preparation method. This method uses a mixture of coffee charcoal powder, bamboo charcoal powder, and coconut shell charcoal powder as an antibacterial agent, which is then mixed with polyethylene terephthalate and a water-soluble polymer to obtain a polyester fiber with antibacterial function and a porous structure. However, this patent still requires the use of multiple toners in combination and the addition of water-soluble polymers to assist in pore formation in the selection of antibacterial agents. The process is relatively complicated and it is difficult to achieve a good antibacterial effect without affecting the fiber performance. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention aims to provide a coffee carbon masterbatch, coffee carbon fibers with antibacterial properties, and a preparation method thereof. This invention utilizes phosphate ester modification of coffee carbon to produce coffee carbon fibers with excellent antibacterial properties without the addition of additional antibacterial agents and at low dosages, while maintaining good mechanical strength of the fibers. This achieves a balance between the green recycling of coffee grounds and high fiber performance.

[0007] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: The present invention provides a coffee carbon masterbatch comprising modified coffee carbon powder and a carrier polymer; the modified coffee carbon powder is obtained by modifying carbonized coffee grounds with a phosphate ester dispersant.

[0008] Preferably, the phosphate ester dispersant contains a -OP(=O)(OH)2 structure or its salt form.

[0009] Preferably, the phosphate ester dispersant is selected from at least one of alkyl / alkenyl alkoxylated phosphate esters, phosphate esters with active end groups, and modified polyether phosphate esters.

[0010] Furthermore, the mass ratio of the modified coffee toner to the carrier polymer is 1:5~100.

[0011] Furthermore, the carrier polymer is chemical fiber powder and / or chemical fiber chips.

[0012] Furthermore, the modified coffee toner is prepared by a method comprising the following steps: The carbonized coffee grounds are crushed to a particle size of less than 100 mesh, mixed with the phosphate ester dispersant at a mass ratio of 1:0.01~0.2 in the dispersed phase, ground in a sand mill, and then dried.

[0013] More specifically, the preparation method of modified coffee toner is as follows: De-oiled and carbonized coffee grounds are initially crushed to particles smaller than 100 mesh. This crushed grounds are then uniformly dispersed in a dispersed phase with a phosphate polyester modifier at a mass ratio of 1:0.01-0.2. The mixture is then ground in a sand mill at room temperature, with zirconium beads having a particle size of 0.3 mm-1.0 mm, for 0.5-5 hours, yielding a modified coffee toner slurry with an average particle size of 200 nm. The slurry is then dried at a low temperature (30℃-60℃) to obtain coffee toner with a moisture content of less than 0.5%. The dispersed phase is one or more of water, ethanol, and isopropanol.

[0014] Another aspect of the present invention provides a method for preparing coffee carbon fiber with antibacterial properties, which includes the following steps: Modified coffee toner was obtained by modifying carbonized coffee grounds with phosphate ester dispersants. The modified coffee carbon powder is mixed with a carrier polymer, and then melt-blended and granulated to obtain coffee carbon masterbatch. The coffee carbon masterbatch is mixed with a matrix polymer and then melt-spun to obtain coffee carbon fiber.

[0015] Furthermore, in the modification treatment, the mass ratio of the phosphate ester dispersant to the carbonized coffee grounds is 0.01~0.2:1, and the coffee carbon is ground using a sand mill until the average particle size is 200nm; the melt blending granulation temperature is 200-300℃; in the melt spinning, the mass ratio of the coffee carbon masterbatch to the matrix polymer is 0.05-1:1, the spinning temperature is 200-300℃, and the spinning winding speed is 2200-4000m / min.

[0016] The present invention further provides a coffee carbon fiber with antibacterial properties prepared by the above preparation method.

[0017] The present invention also provides a coffee carbon polyester fiber, which is obtained by melt spinning after mixing the coffee carbon masterbatch with polyester chips.

[0018] The beneficial effects of this invention are as follows: This invention employs phosphate ester dispersants to simultaneously modify coffee carbon through ultrafine grinding. The phosphate ester dispersant's molecular structure contains lipophilic long-chain segments and phosphate ester groups with affinity for water / solid surfaces. This amphiphilic structure allows it to effectively anchor onto the surface of coffee carbon particles. Through the synergistic effect of charge repulsion and steric hindrance, it significantly improves the dispersion uniformity and interfacial compatibility of coffee carbon in the polymer matrix, fundamentally avoiding the problem of nanoparticle aggregation. Simultaneously, the phosphate ester groups impart positive charge characteristics to the modified coffee carbon surface, enabling it to disrupt the integrity of bacterial cell membranes through electrostatic adsorption, thereby endowing the fiber with excellent antibacterial properties without the addition of any additional antibacterial agents. Furthermore, thanks to the protective and dispersing effects of the phosphate ester dispersant, the inherent microporous structure and high specific surface area of ​​the coffee carbon are effectively maintained during ultrafine grinding and subsequent high-temperature melting processing, giving the fiber multiple functions such as superior physical adsorption of odors, moisture absorption and quick drying, and heat storage and insulation. Based on the above, only a low amount of coffee carbon is needed to achieve efficient antibacterial properties, while the low amount ensures that the mechanical properties of the fiber are not significantly affected. At the same time, the entire modification process does not require complex multi-step chemical reactions, the process is simple, energy consumption is low, the cycle is short, and it is easy to industrialize. It achieves a balance between the green recycling of coffee grounds and the high performance and multifunctionality of the fiber, and can be widely used in clothing, home textiles and other industrial fields. Detailed Implementation

[0019] 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.

[0020] This invention provides a coffee carbon masterbatch comprising modified coffee carbon powder and a carrier polymer; the modified coffee carbon powder is obtained by modifying carbonized coffee grounds with a phosphate ester dispersant. This invention also provides a coffee carbon fiber with antibacterial properties and its preparation method, which involves mixing the above-mentioned coffee carbon masterbatch with a matrix polymer and then melt spinning to obtain the coffee carbon fiber. This invention further provides a coffee carbon polyester fiber, which is obtained by mixing the above-mentioned coffee carbon masterbatch with polyester chips and then melt spinning.

[0021] This invention addresses the problem that adding additional antibacterial agents reduces fiber performance. It employs phosphate ester dispersants to simultaneously modify the surface of coffee carbon during ultrafine grinding. The amphiphilic structure of the phosphate ester dispersants effectively anchors the fibers to the surface of coffee carbon particles. Through the synergistic effect of charge repulsion and steric hindrance, particle agglomeration is prevented, while simultaneously imparting positive charge properties to the surface of the coffee carbon. Thus, without the addition of additional antibacterial agents, only a very low amount is needed to achieve highly efficient antibacterial properties of the fiber while maintaining its mechanical properties.

[0022] The specific embodiments of the present invention will be described in detail below.

[0023] 1. Preparation of modified coffee toner In an embodiment of the present invention, the coffee grounds are first pretreated. The coffee grounds are waste coffee grounds generated during the processing of coffee beverages, which are used after degreasing and carbonization pretreatment. Exemplarily, the degreasing and carbonization treatment can be carried out with reference to existing technology to remove oils and volatile components from the coffee grounds, resulting in carbonized coffee grounds.

[0024] The degreased and carbonized coffee grounds are initially crushed to a particle size of less than 100 mesh. Crushing can be performed using conventional grinding equipment in this field, such as a hammer crusher, air jet mill, or ball mill.

[0025] The crushed coffee toner is mixed with a phosphate ester dispersant at a mass ratio of 1:0.01~0.2. The phosphate ester dispersant is selected from at least one of alkyl / alkenyl alkoxylated phosphate esters, phosphate esters with active end groups, and modified polyether phosphate esters. Exemplarily, the phosphate ester dispersant can be one or more of fatty alcohol polyoxyethylene ether phosphate (AEP), polyether phosphate esters, polyester segment modified phosphate esters (introducing double bonds), polydimethylsiloxane modified phosphate esters, etc. Preferably, the phosphate ester dispersant contains a -OP(=O)(OH)2 structure or its salt form, which imparts excellent anchoring ability and charge properties to the dispersant.

[0026] The above-mentioned coffee toner and phosphate ester dispersant are mixed evenly in a dispersed phase, wherein the dispersed phase is selected from one or more of water, ethanol, and isopropanol. Preferably, the mass ratio of solid material to dispersed phase is 2:8 to 5:5, more preferably 3:7 to 4:6. Mixing can be performed by high-speed stirring for 10 to 60 minutes, preferably 20 to 40 minutes.

[0027] The uniformly mixed slurry is fed into a sand mill for grinding, with the zirconium beads having a particle size of 0.3 mm to 1.0 mm; the grinding time is 0.5 h to 5 h, more preferably 2 h to 4 h. Grinding is carried out at room temperature to obtain a modified coffee carbon slurry, wherein the average particle size of the coffee carbon is 200 nm. It should be understood that the grinding time and zirconium bead particle size can be appropriately adjusted according to the actual equipment and raw material conditions to obtain the target particle size.

[0028] The ground modified coffee charcoal slurry is dried at a temperature of 30℃~60℃ until the moisture content of the powder is less than 0.5%, thus obtaining modified coffee charcoal powder.

[0029] In the technical solution of this invention, phosphate ester dispersants simultaneously function as both ultrafine grinding aids and surface modifiers. The molecular structure of phosphate ester dispersants contains lipophilic long-chain segments and phosphate ester groups with affinity for water / solid surfaces. This amphiphilic structure allows them to effectively anchor onto the surface of coffee carbon particles. During grinding, the synergistic effect of charge repulsion and steric hindrance prevents particle agglomeration, thereby achieving highly efficient ultrafine grinding. Simultaneously, the phosphate ester groups impart positive charge properties to the modified coffee carbon surface, providing a structural basis for its subsequent antibacterial function in fibers.

[0030] 2. Preparation of coffee carbon masterbatch The modified coffee toner obtained above is mixed evenly with the carrier polymer, wherein the mass ratio of the modified coffee toner to the carrier polymer is 1:5~100.

[0031] The carrier polymer is a polymeric material capable of being used to prepare synthetic fibers. Exemplarily, it can be selected from one or more of polyesters (such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc.), polyamides (such as PA6, PA66, etc.), polyacrylonitrile, polyvinyl chloride, polypropylene, polyvinyl alcohol, aromatic polyamides (such as aramid 1313, aramid 1414, etc.), and polyurethane (spandex). Preferably, the carrier polymer is a polyester, more preferably polyethylene terephthalate.

[0032] The carrier polymer can be in the form of powder, slices, or particles, preferably powder or slices. In one embodiment, the carrier polymer is chemical fiber powder and / or chemical fiber slices.

[0033] The above-mentioned mixed powder or mixture is injected into a twin-screw extruder for melt blending and extrusion. The extrusion temperature is 200℃~300℃, more preferably 240℃~280℃. Exemplarily, the processing temperature of the twin-screw extruder can be adjusted according to the type of carrier polymer. For example, when the carrier polymer is polyester, the processing temperature is 250℃~280℃; when the carrier polymer is polyamide, the processing temperature is 240℃~270℃; and when the carrier polymer is polypropylene, the processing temperature is 200℃~230℃.

[0034] After extrusion, the material is cut and granulated to obtain coffee carbon masterbatch. In the coffee carbon masterbatch, modified coffee carbon powder is uniformly dispersed in the carrier polymer matrix, forming a masterbatch product suitable for subsequent melt spinning.

[0035] 3. Preparation of coffee carbon fiber The coffee carbon masterbatch obtained above is mixed with the matrix polymer and then melt-spun to obtain coffee carbon fiber.

[0036] The matrix polymer is a high molecular weight material capable of preparing synthetic fibers through melt spinning. Exemplarily, it can be selected from one or more of polyesters (such as PET, PBT, etc.), polyamides (such as PA6, PA66, etc.), polyacrylonitrile, polyvinyl chloride, polypropylene, polyvinyl alcohol, aromatic polyamides, and polyurethanes. Preferably, the matrix polymer is a polyester, more preferably polyethylene terephthalate.

[0037] The physical form of the matrix polymer can be chips, powder, or granules, preferably chips, to be compatible with conventional melt spinning equipment.

[0038] The mass ratio of coffee carbon masterbatch to matrix polymer is 0.05 to 1:1. This ratio ensures that the coffee carbon content derived from the coffee carbon masterbatch in the final fiber is 0.2% to 1%.

[0039] It should be noted that, in this invention, the term "carrier polymer" refers to the polymer material used to support modified coffee toner for preparing masterbatch, and the term "matrix polymer" refers to the polymer material used to blend with coffee toner masterbatch for melt spinning to form a fiber matrix. The carrier polymer and matrix polymer can be of the same or different types, and their physical forms can be independently chips, powders, or granules, without being limited to any particular form. In one or more embodiments, the carrier polymer is a synthetic fiber powder and / or synthetic fiber chips. In a preferred embodiment, both the carrier polymer and the matrix polymer are polyesters; in another embodiment, the carrier polymer and the matrix polymer are independently selected from different polymer types.

[0040] The mixture of coffee carbon masterbatch and matrix polymer is dried and then fed into a melt spinning machine for spinning. The spinning temperature is determined according to the type of matrix polymer, typically 200°C to 300°C, preferably 240°C to 280°C. For example, when the matrix polymer is polyester, the spinning temperature is 250°C to 280°C; when the matrix polymer is polyamide, the spinning temperature is 240°C to 270°C; and when the matrix polymer is polypropylene, the spinning temperature is 210°C to 240°C.

[0041] The spinning and winding speed is 2200m / min to 4000m / min, more preferably 2500m / min to 3000m / min.

[0042] After spinning, further post-processing steps such as stretching and heat setting can be performed as needed to adjust the mechanical properties and thermal shrinkage rate of the fiber, resulting in the final coffee carbon fiber product.

[0043] The coffee carbon fiber prepared by the above method has excellent antibacterial properties without the addition of any additional antibacterial agents because it adopts a technical solution of simultaneous ultrafine modification of coffee carbon with phosphate ester dispersants. The modified coffee carbon has a positive charge on its surface, which can destroy the integrity of bacterial cell membranes through electrostatic adsorption. At the same time, the phosphate ester dispersants effectively improve the dispersibility and compatibility of coffee carbon in the polymer matrix, avoid the agglomeration of nanoparticles, and preserve the inherent porous structure of coffee carbon.

[0044] Based on the above mechanism, highly efficient antibacterial effects can be achieved with only extremely low addition amounts (0.2%~1% carbon content in the fiber), while the low addition amount ensures that the mechanical properties of the fiber are not significantly affected. Tests show that the coffee carbon fiber prepared by this invention achieves an antibacterial rate of over 99% against Staphylococcus aureus and over 99% against Escherichia coli, while maintaining a fiber breaking strength of over 2.5 cN / dtex.

[0045] The coffee carbon fiber produced by this invention has multiple functions such as antibacterial, adsorption, heat storage and insulation, and can be widely used in clothing (such as underwear, sportswear, socks, etc.), home textiles (such as bedding, towels, etc.) and other industrial fields, realizing the green and environmentally friendly recycling of coffee grounds waste.

[0046] The present invention will be further described below through specific embodiments.

[0047] Example 1

[0048] (1) The dried coffee carbon that has been crushed and passed through a 100-mesh sieve is dispersed evenly in ethanol at a mass ratio of 1:0.05 with fatty alcohol polyoxyethylene ether phosphate. The mass ratio of solid material to ethanol is 3:7. The mixture is stirred for 20 minutes until fully mixed, and then fed into a sand mill with zircon beads of 0.8~1.0 mm in diameter. After grinding for 3 hours, the material is discharged, collected, and transferred to a 40℃ forced-air drying oven to dry into powder, thus obtaining modified coffee carbon powder.

[0049] (2) The modified coffee toner powder and polyester fiber powder are mixed and stirred thoroughly. The mass ratio of modified coffee to polyester fiber powder is 1:100. The mixed powder is injected into a twin-screw extruder for extrusion granulation. The processing temperature of the twin-screw extruder is 260℃.

[0050] (3) The obtained coffee carbon masterbatch is blended with polyester fiber masterbatch and spun by melt spinning machine to obtain coffee carbon antibacterial polyester fiber filament. The coffee carbon masterbatch and polyester fiber masterbatch are mixed at a mass ratio of 1:19, the spinning temperature is 260℃, and the spinning winding speed is 2500m / min.

[0051] Example 2

[0052] (1) The dried coffee carbon that has been crushed and passed through a 100-mesh sieve is dispersed evenly in ethanol at a mass ratio of 1:0.02, and the mass ratio of solid material to ethanol is 3:7. The mixture is stirred for 20 minutes until fully mixed, and then put into a sand mill. The zircon beads have a particle size of 0.8~1.0 mm. After grinding for 3 hours, the material is discharged, collected, and transferred to a 40℃ forced-air drying oven to dry into powder, thus obtaining modified coffee carbon powder.

[0053] (2) The modified coffee toner powder and polyester fiber powder are mixed and stirred thoroughly. The mass ratio of modified coffee to polyester fiber powder is 1:100. The mixed powder is injected into a twin-screw extruder for extrusion granulation. The processing temperature of the twin-screw extruder is 270℃.

[0054] (3) The obtained coffee carbon masterbatch is blended with polyamide fiber masterbatch and spun by melt spinning machine to obtain coffee carbon antibacterial polyamide fiber filament. The coffee carbon masterbatch and polyamide fiber masterbatch are mixed at a mass ratio of 1:15, the spinning temperature is 270℃, and the spinning winding speed is 2600m / min.

[0055] Example 3

[0056] (1) The dried coffee carbon that has been crushed and passed through a 100-mesh sieve is dispersed evenly in water at a mass ratio of 1:0.2 with polydimethylsiloxane modified phosphate. The mass ratio of solid material to water is 4:6. The mixture is stirred for 40 minutes until fully mixed, and then put into a sand mill. The zircon beads have a particle size of 0.8~1.0 mm. After grinding for 4 hours, the material is discharged, collected, and transferred to a 60℃ forced-air drying oven to dry into powder to obtain modified coffee carbon powder.

[0057] (2) The modified coffee toner powder and polyester fiber powder are mixed and stirred thoroughly. The mass ratio of modified coffee to polyester fiber powder is 1:100. The mixed powder is injected into a twin-screw extruder for extrusion granulation. The processing temperature of the twin-screw extruder is 260℃.

[0058] (3) The obtained coffee carbon masterbatch is blended with polyester fiber masterbatch and spun by melt spinning machine to obtain coffee carbon antibacterial polyester fiber filament. The coffee carbon masterbatch and polyester fiber masterbatch are mixed at a mass ratio of 1:19, the spinning temperature is 260℃, and the spinning winding speed is 2500m / min.

[0059] Comparative Example 1 (1) The dry coffee carbon that has been pulverized and passed through a 100-mesh sieve is dispersed evenly in ethanol at a mass ratio of 1:0.05, with a solid-to-ethanol mass ratio of 3:7. The mixture is stirred for 20 minutes until fully mixed, and then fed into a sand mill with zircon beads of 0.8~1.0 mm in diameter. After grinding for 3 hours, the material is discharged, collected, and transferred to a 40℃ forced-air drying oven to dry into powder, thus obtaining modified coffee carbon powder.

[0060] (2) The modified coffee toner powder and polyester fiber powder are mixed and stirred thoroughly. The mass ratio of modified coffee to polyester fiber powder is 1:100. The mixed powder is injected into a twin-screw extruder for extrusion granulation. The processing temperature of the twin-screw extruder is 260℃.

[0061] (3) The obtained coffee carbon masterbatch is blended with polyester fiber masterbatch and spun by melt spinning machine to obtain coffee carbon antibacterial polyester fiber filament. The coffee carbon masterbatch and polyester fiber masterbatch are mixed at a mass ratio of 1:19, the spinning temperature is 260℃, and the spinning winding speed is 2500m / min.

[0062] Comparative Example 2 (1) Polyester fiber powder is injected into a twin-screw extruder for extrusion granulation. The processing temperature of the twin-screw extruder is 260℃ to obtain polyester fiber masterbatch.

[0063] (2) The obtained polyester fiber masterbatch is spun into pure polyester fiber filaments by melt spinning machine at a spinning temperature of 260℃ and a spinning winding speed of 2500m / min.

[0064] The antibacterial and mechanical properties of the above embodiments and comparative examples were tested. The test methods and results are shown below.

[0065] Antimicrobial testing was conducted according to the AATCC 100-2019 absorption method, using Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 25922) as the test strains. The test results are shown in Table 1.

[0066] The fiber breaking strength was tested according to GB / T 14344-2008 standard, and the test results are shown in Table 1.

[0067] Table 1

[0068] As shown in Table 1, Examples 1-3 modified with phosphate ester dispersants all exhibited good antibacterial effects, while Comparative Example 1, which used copolymer alkylammonium salts to replace phosphate ester dispersants, completely lost its antibacterial properties. Comparative Example 2, with its pure polyester fibers, only showed an inhibitory effect on *Escherichia coli*, with very weak inhibitory effect on *Staphylococcus aureus*. Regarding mechanical properties, the breaking strength of Examples 1-3 was higher than that of pure polyester fibers (Comparative Example 2). This is attributed to the phosphate ester dispersants improving the dispersibility and compatibility of coffee carbon in the polymer matrix, thus avoiding stress concentration caused by particle agglomeration.

[0069] The above results show that the coffee carbon fiber prepared by the present invention has good antibacterial properties and maintains excellent fiber mechanical properties when the amount of coffee carbon added is low and no additional antibacterial agent is added.

[0070] 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.

[0071] 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. A coffee carbon masterbatch, characterized in that, It comprises modified coffee toner and a carrier polymer; the modified coffee toner is obtained by modifying carbonized coffee grounds with a phosphate ester dispersant.

2. The coffee carbon masterbatch according to claim 1, characterized in that, The phosphate ester dispersant contains the -OP(=O)(OH)2 structure or its salt form.

3. The coffee carbon masterbatch according to claim 2, characterized in that, The phosphate ester dispersant is selected from at least one of alkyl / alkenyl alkoxylated phosphate esters, phosphate esters with active end groups, and modified polyether phosphate esters.

4. The coffee carbon masterbatch according to claim 1, characterized in that, The mass ratio of the modified coffee toner to the carrier polymer is 1:5~100.

5. The coffee carbon masterbatch according to claim 1, characterized in that, The carrier polymer is chemical fiber powder and / or chemical fiber chips.

6. The coffee carbon masterbatch according to claim 1, characterized in that, The modified coffee toner is prepared by a method comprising the following steps: The carbonized coffee grounds are crushed to a particle size of less than 100 mesh, mixed with the phosphate ester dispersant at a mass ratio of 1:0.01~0.2 in the dispersed phase, ground in a sand mill, and then dried.

7. A method for preparing coffee carbon fiber with antibacterial properties, characterized in that, Includes the following steps: Modified coffee toner was obtained by modifying carbonized coffee grounds with phosphate ester dispersants. The modified coffee carbon powder is mixed with a carrier polymer, and then melt-blended and granulated to obtain coffee carbon masterbatch. The coffee carbon masterbatch is mixed with a matrix polymer and then melt-spun to obtain coffee carbon fiber.

8. The preparation method according to claim 7, characterized in that, In the modification treatment, the mass ratio of the phosphate ester dispersant to the carbonized coffee grounds is 0.01~0.2:1, and the coffee carbon is ground using a sand mill until the average particle size is 200nm; the melt blending granulation temperature is 200-300℃; in the melt spinning, the mass ratio of the coffee carbon masterbatch to the matrix polymer is 0.05-1:1, the spinning temperature is 200-300℃, and the spinning winding speed is 2200-4000m / min.

9. A coffee carbon fiber with antibacterial properties prepared by the preparation method according to claim 7 or 8.

10. A coffee-carbon polyester fiber, characterized in that, It is prepared by melt spinning after mixing coffee carbon masterbatch as described in any one of claims 1 to 6 with polyester chips.

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