Bio-based antibacterial powder for textiles as well as preparation method and application of bio-based antibacterial powder

Abstract

The invention discloses bio-based antibacterial powder for textile coloring, the bio-based antibacterial powder is a nano colored particle with a core-shell structure, which takes a natural coloring agent as a core and a polymer polymerized by a bio-based antibacterial monomer, a polymer monomer, a silicon modified monomer and a dispersing agent as a shell, and the mass ratio of the core to the shell is 1: (1-3). The invention further discloses a preparation method and application of the bio-based antibacterial powder for textile coloring, the coloring agent and the dispersing agent are used as water phases, the polymeric monomer is used as an oil phase to prepare dispersion liquid of the nano coloring particles, and the bio-based antibacterial powder is prepared by adopting a spray drying method. Compared with a traditional antibacterial agent, the antibacterial powder coating has the advantages of being low in storage and transportation cost, good in durability and excellent in hand feeling and breathability, no other auxiliaries are needed in a system, and the antibacterial powder coating has the advantage of being low in water consumption. The antibacterial powder disclosed by the invention can also be applied to antibacterial finishing of other flexible base materials or rigid base materials, such as MDF plates, automotive interiors and the like.

Description

Technical Field

[0001] This invention relates to a bio-based antibacterial powder for dyeing textiles, its preparation method, and its application, belonging to the field of textiles. Background Technology

[0002] Home textiles are closely related to people's daily lives, and clothing and bed sheets come into intimate contact with our skin, making their hygiene and safety standards particularly important. With improved living standards and increased health awareness, higher demands are being placed on the antibacterial properties of clothing and home textiles.

[0003] Common antibacterial methods include fiber finishing, which involves uniformly mixing antibacterial agents with fiber resins and then melt-spinning to produce antibacterial fibers. This method offers good antibacterial effects and high durability, but it is complex to process and not suitable for natural fibers. Therefore, most current methods employ post-finishing techniques, such as coating textiles to impart antibacterial properties. Finishing agents are primarily chitosan and silver ion antibacterial agents, but this method can affect breathability and hand feel. Encapsulating antibacterial agents into microcapsules and applying them to fabrics with adhesives can avoid breathability and hand feel issues, but this method requires additional additives, has poor durability, and raises environmental concerns. Furthermore, traditional antibacterial agents are mainly in the form of emulsions or solutions, which significantly increases transportation and storage costs.

[0004] Using antibacterial powder coatings for fabric finishing is one method of fabric finishing. Preparing antibacterial agents in powder form facilitates their storage and transportation, and formulating antibacterial powders into finishing solutions for fabric finishing is also very convenient. However, most antibacterial powder coatings currently applicable to the textile industry are prepared by blending. On the one hand, blending requires strict requirements for the uniformity of material dispersion and is difficult to process. On the other hand, the compatibility between colorants and antibacterial materials is poor, and antibacterial coating finishing solutions containing both colorants and antibacterial materials have poor dyeing effects on fabrics, resulting in uneven color and poor color fastness.

[0005] An infant's immune system is not yet fully developed, making them less resistant to external pathogens. Furthermore, their delicate skin is susceptible to bacterial infections, thus requiring stringent antibacterial properties in infant clothing. On the other hand, bright colors are also essential for infant clothing, making them more visible to parents or guardians outdoors and enhancing their safety. Simultaneously, bright colors attract infants' attention, providing rich visual stimulation and contributing to their visual and brain development. Therefore, developing an antibacterial powder coating that integrates dyeing and antibacterial properties, is applicable to the textile industry, and offers superior dyeing, antibacterial, and fabric finishing effects is of great significance. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to design and develop a bio-based antibacterial powder for textiles, its preparation method, and its application, in order to solve the problems of high transportation and storage costs of existing antibacterial finishing solutions and poor dispersibility and dyeing effect of existing antibacterial powder coatings. The fabric finishing method of the present invention can effectively solve the problems of complex processing, poor breathability, poor hand feel, and poor durability of existing finishing methods.

[0007] To address the aforementioned objectives, this invention provides a core-shell structured coloring particle, where the core material is a natural colorant and the shell material is a bio-based material, a polymer monomer used to regulate the glass transition temperature, and a silicon-modified monomer. The silicon-modified monomer imparts a soft hand feel and breathability to the fabric. Compared to traditional antibacterial agents, the antibacterial powder coating of this invention features low storage and transportation costs, good durability, and excellent hand feel and breathability. Furthermore, the system requires no other additives and exhibits low water consumption compared to traditional textile finishing methods. This invention can be applied not only to antibacterial finishing of home textile fabrics but also to antibacterial finishing of other flexible or rigid substrates, such as MDF boards and automotive interiors.

[0008] To achieve the above objectives, the present invention first provides a bio-based antibacterial powder for dyeing textiles. The bio-based antibacterial powder is a core-shell structured nano-coloring particle with a core-to-shell mass ratio of 1:1-3. The core includes a colorant, and the shell is a polymer formed by polymerizing a bio-based antibacterial monomer, a polymer monomer, a silicon-modified monomer, and a dispersant. The bio-based antibacterial monomer includes a chitosan derivative, and the polymer monomer includes at least one of styrene, methyl methacrylate, acrylonitrile, butyl acrylate, ethyl acrylate, isooctyl acrylate, and hydroxyethyl acrylate. The silicon-modified monomer includes a siloxane.

[0009] In one embodiment of the present invention, the colorant is a natural colorant, including at least one of beetroot red, curcumin, spirulina blue, purple cabbage extract, carotenoids, cochineal red, spinach green, and safflower yellow.

[0010] In one embodiment of the present invention, the chitosan derivative includes at least one of quaternized chitosan derivative, acylated chitosan derivative, carboxylated chitosan derivative, and alkylated chitosan derivative.

[0011] In one embodiment of the present invention, the mass ratio of the bio-based antibacterial monomer to the colorant is 1:10-20.

[0012] In one embodiment of the present invention, the polymer monomer includes a hard monomer and a soft monomer. The hard monomer includes one or more of acrylic acid, styrene, methyl methacrylate, acrylonitrile, and methacryloyloxyethyltrimethylammonium chloride, and the soft monomer includes one or more of butyl acrylate, ethyl acrylate, isooctyl acrylate, and hydroxyethyl acrylate.

[0013] In one embodiment of the present invention, the mass ratio of the bio-based antibacterial monomer, hard monomer, and soft monomer is 1-2:1:0.2-2.

[0014] In one embodiment of the present invention, the siloxane includes at least one of vinyltrimethoxysilane (VTMS), vinyl-terminated polydimethylsiloxane, γ-(methacryloyloxy)propyltrimethoxysilane, vinyltri(methoxyethoxy)silane, and vinyltriisopropoxysilane.

[0015] In one embodiment of the present invention, the amount of silicon-modified monomer used is 1-10% of the total mass of the soft and hard monomers.

[0016] In one embodiment of the present invention, the dispersant includes one or more of DNS-86, SR-10, DM-1501, sodium p-styrene sulfonate, sodium dodecylbenzene sulfonate, and sodium dodecyl sulfate.

[0017] In one embodiment of the present invention, the mass ratio of the dispersant to the colorant is 0.5-2:1.

[0018] In one embodiment of the present invention, the glass transition temperature of the nanopowder coating is 50-100°C.

[0019] In one embodiment of the present invention, the particle size of the nanopowder coating is 100-1000 nm.

[0020] This invention also discloses a method for preparing the above-mentioned bio-based antibacterial powder for dyeing textiles, comprising the following steps:

[0021] 1) Aqueous phase preparation: The colorant and dispersant are uniformly dispersed in water and ground until uniformly dispersed to prepare the aqueous phase;

[0022] 2) Oil phase preparation: The polymer monomer and the silicon-modified monomer are uniformly mixed to prepare the oil phase;

[0023] 3) Dispersion preparation: The oil phase is slowly added to the aqueous phase and heated to 75°C. An initiator is added and mechanically stirred to mix evenly to obtain a mixed solution. The oil phase is then slowly added dropwise to the mixed solution. After reacting for a period of time, the mixture is cooled and discharged. Bio-based antibacterial monomers are added and stirred to mix evenly to obtain a dispersion of nano-colored particles.

[0024] 4) Powder preparation: The dispersion of nano-colored particles is passed into a spray dryer, and the bio-based antibacterial powder for textile coloring is obtained through spraying, hot air drying, cyclone separation and cooling steps.

[0025] In one embodiment of the present invention, the initiator includes one or more of azobisisobutyronitrile persulfate (AIBN), ammonium persulfate (APS), potassium persulfate, and azobisisobutyramidine dihydrochloride (AIBA).

[0026] In one embodiment of the present invention, the amount of the initiator added is 1-5% of the total mass of the oil phase.

[0027] In one embodiment of the present invention, in step (3), the mechanical stirring speed is 200-800 rpm, the slow dripping is at a rate of 10-20 s / drop, and the reaction time is 4-8 h.

[0028] In one embodiment of the present invention, in step (4), the inlet air temperature of the spray dryer is 100-230°C and the outlet air temperature is 50-120°C.

[0029] The present invention also provides an application of the above-mentioned bio-based antibacterial powder for textile coloring in textile coloring.

[0030] In one embodiment of the present invention, the application involves electrostatically spraying the aforementioned bio-based antibacterial powder for textile coloring onto a pretreated textile, followed by hot rolling to obtain the colored textile.

[0031] In one embodiment of the present invention, the electrostatic spraying process is characterized by an electrostatic voltage of 30-80kV, an electrostatic current of 3-15μA, a spraying distance of 5-20cm, and an atomizing gas pressure of 0.3-0.7MPa.

[0032] In one embodiment of the present invention, the thickness of the spray coating is 10-100 μm.

[0033] In one embodiment of the present invention, the temperature of the hot rolling roll is 130-180°C, and the pressure is 0.8-1.5 kg / cm². 2 .

[0034] In one embodiment of the present invention, the pretreatment includes one or more of the following: water immersion treatment, adhesive coating, embedding conductive yarn, and coating with conductive liquid.

[0035] In one embodiment of the present invention, the resistivity of the pretreated textile is 5.5-1.5 × 10⁻⁶. 6 Ω.

[0036] Beneficial effects:

[0037] (1) Using a colorant as the core and bio-based polysaccharides and polymers as the shell, antibacterial functional monomers are covalently bonded to the shell layer, and then a shell-core structure bio-based antibacterial powder for textile coloring is prepared by spray drying. The bio-based antibacterial powder prepared by the method of the present invention has a suitable particle size and can be fixed on the surface of the fabric by methods such as electrostatic spraying to achieve fabric finishing.

[0038] (2) The antibacterial powder coating of the present invention has the advantages of low storage and transportation costs, good durability and excellent hand feel and breathability compared with traditional antibacterial agents. Moreover, no other additives are required in the system, and it has the advantage of low water consumption compared with traditional textile finishing.

[0039] (3) The antibacterial functional monomers are covalently bonded to the shell, which makes the antibacterial powder have good antibacterial properties on the one hand, and good antibacterial durability on the other hand. After washing 50 times, the antibacterial rate of Candida albicans can reach more than 82%, and the antibacterial rate of Escherichia coli can reach more than 89%.

[0040] (4) The colorant is encapsulated in the polymer layer. After the fabric is treated with antibacterial powder containing the colorant, the fabric has bright color, high color fastness, and more uniform dyeing. The treated fabric has good breathability. The antibacterial powder prepared with natural pigments has a soft feel and the powder particle size is within a suitable range. The fabric has better antibacterial durability. Furthermore, natural pigments do not pose any safety risks. The treated fabric is suitable for use by infants and young children.

[0041] (5) The antibacterial powder prepared by the present invention is not only applicable to the finishing process of dyed fabrics, but also applicable to the coloring or functional finishing of other flexible substrates. Detailed Implementation

[0042] The present invention will be further described below through specific embodiments, but the implementation of the present invention is not limited thereto.

[0043] Test method:

[0044] (1) Hand feel test (softness, resilience and smoothness):

[0045] Cut a 100cm area from the fabric. 2 The fabric was tested for hand feel using a PhabrOmeter3 instrument.

[0046] (2) Antibacterial properties:

[0047] According to the AATCC 100-2004 "Evaluation of antimicrobial finishing of textile materials" test standard, the antimicrobial properties of the fabric were evaluated using ATCC8099 Escherichia coli, ATCC6538 Staphylococcus aureus, and ATCC10231 Candida albicans.

[0048] (3) Colorfastness:

[0049] The samples were subjected to abrasion test according to GB / T 29865-2013 "Textiles - Tests for color fastness to rubbing" and soaping test according to Test Method C of GB / T 3921-2008 "Textiles - Tests for color fastness to rubbing" and soaping fastness were assessed using gray scale cards.

[0050] (4) Apparent color depth and evenness

[0051] Eight points were randomly selected on the surface of the dyed fabric, and the K / S value and ΔE (color difference value) of the dyed fabric were measured using a Datacolor 650 desktop spectrophotometer. The average value was then taken.

[0052] (5) Air permeability retention rate

[0053] The air permeability retention rate is determined according to GB / T 5453-1997 "Determination of air permeability of textile fabrics". The ratio of the air permeability of the finished fabric to the air permeability before finishing is the air permeability retention rate.

[0054] (6) Glass transition temperature

[0055] The glass transition temperature was measured using a differential scanning calorimeter (TAQ200).

[0056] (7) Particle size

[0057] Particle size was measured using an NS-90 nanoparticle size analyzer.

[0058] (8) Coating thickness

[0059] The thickness difference between the finished and unfinished fabrics was measured using a thickness gauge, and the average value was taken from three randomly selected locations.

[0060] Example 1:

[0061] A bio-based antibacterial powder for textile dyeing, the bio-based antibacterial powder being nano-coloring particles with a core-shell structure, wherein the core is a colorant curcumin, and the shell is a polymer formed by polymerizing a bio-based antibacterial monomer, a polymer monomer, a silicon-modified monomer, and a dispersant; the bio-based antibacterial monomer is quaternary ammonium salt chitosan, the polymer monomer includes acrylic acid, butyl acrylate, and methyl methacrylate, and the silicon-modified monomer is vinyltrimethylsiloxane.

[0062] A method for preparing a bio-based antibacterial powder for textile dyeing includes the following steps:

[0063] 1g of curcumin and 1.5g of dispersant DM1501 were uniformly dispersed in water and ground until uniformly dispersed to prepare an aqueous phase. The aqueous phase was then transferred to a three-necked flask and mechanically stirred until uniformly mixed. 3g of acrylic acid, 5g of butyl acrylate, 7.5g of methyl methacrylate, and 0.3g of vinyltrimethylsiloxane were uniformly mixed to prepare a transparent oil phase, which was slowly added dropwise to the three-necked flask. The mixture was mechanically stirred at 600 rpm and the temperature was slowly raised to 75°C. 2mL of deionized water containing 0.2g of ammonium persulfate initiator was added at a rate of 20s / drop. After reacting for 2 hours, another 3mL of deionized water containing 0.3g of ammonium sulfate initiator was added at a rate of 20s / drop. After reacting for 3 hours, the mixture was cooled to room temperature, and 5g of quaternary ammonium salt chitosan was added to obtain a dispersion of nano-colored particles. The dispersion of nano-colored particles is fed into a spray dryer with an inlet air temperature of 160°C and an outlet air temperature of 70°C. After spraying, hot air drying, cyclone separation, and cooling, a bio-based antibacterial powder for textiles is obtained.

[0064] The application of a bio-based antibacterial powder for textile dyeing includes the following steps:

[0065] Textiles are impregnated with an aqueous solution. The prepared bio-based antibacterial powder for textile coloring is weighed and sprayed onto the textiles using electrostatic spraying. The electrostatic voltage is controlled at 60kV, the electrostatic current at 7μA, the spraying distance at 10cm, the atomizing gas pressure at 0.4MPa, and the spraying thickness at 10μm. The antibacterial colored textiles are obtained by passing the powder through a hot roller at 160℃.

[0066] The resulting bio-based antibacterial powder for textiles has a particle size of 300.6 nm and a glass transition temperature of 60.2 °C. The antibacterial dyed textiles exhibit a softness of 66.44, resilience of 37.30, smoothness of 83.11, K / S of 17.8, ΔE of 1.08, dry and wet rubbing fastness both reaching grade 5, washing fastness of grade 4, and air permeability retention of 90.5%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 98.5%, 97.4%, and 94.6%, respectively, and the antibacterial rates after 50 washes are 90.5%, 88.6%, and 86.2%, respectively.

[0067] Example 2

[0068] The difference between Example 2 and Example 1 is that, before spraying the bio-based antibacterial powder, the textile was first immersed in a conductive liquid with a pick-up rate of 85%. The conductive liquid was an aqueous solution of antistatic agent SN with a concentration of 2% (owf).

[0069] The antibacterial dyed textiles exhibited a softness of 66.44, resilience of 37.30, smoothness of 83.11, K / S of 17.8, ΔE of 1.08, dry and wet rubbing fastness of grade 5, washing fastness of grade 4, and air permeability retention of 90.5%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reached 96.5%, 95.4%, and 93.6%, respectively, with antibacterial rates of 89.4%, 85.6%, and 82.8% after 50 washes.

[0070] Example 3

[0071] The difference between Example 3 and Example 1 is that, in preparing the bio-based antibacterial powder for textile coloring, the amount of methyl methacrylate used is 10g and the amount of butyl acrylate used is 2.5g.

[0072] The resulting bio-based antibacterial powder for textiles has a particle size of 280.3 nm and a glass transition temperature of 69.4 °C. The antibacterial dyed textiles exhibit a softness of 68.26, resilience of 34.83, smoothness of 82.18, K / S ratio of 16.9, ΔE of 1.71, dry and wet rubbing fastness of grade 5, washing fastness of grade 4, and air permeability retention of 89.3%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 96.3%, 95.2%, and 93.9%, respectively, and the antibacterial rates after 50 washes are 89.6%, 85.7%, and 82.2%, respectively.

[0073] Example 4

[0074] The difference between Example 4 and Example 1 is that, in preparing the bio-based antibacterial powder for textile dyeing, the amount of methyl methacrylate used is 5g and the amount of butyl acrylate used is 10g.

[0075] The obtained bio-based antibacterial powder for textiles has a particle size of 528.6 nm and a glass transition temperature of 51.3℃. The antibacterial dyed textiles exhibit a softness of 61.39, resilience of 38.25, smoothness of 85.29, K / S of 15.6, ΔE of 1.41, dry and wet rubbing fastness both reaching grade 5, washing fastness of grade 4, and air permeability retention of 90.1%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 96.5%, 95.6%, and 93.3%, respectively, and the antibacterial rates after 50 washes are 89.9%, 86.2%, and 82.3%, respectively.

[0076] Example 5

[0077] The difference between Example 5 and Example 1 is that, in preparing the bio-based antibacterial powder for textile dyeing, the bio-based antibacterial monomer used is carboxylated chitosan, and the acrylic acid is adjusted to methacryloyloxyethyltrimethylammonium chloride, with an amount of 3g.

[0078] The resulting bio-based antibacterial powder for textiles has a particle size of 352.6 nm and a glass transition temperature of 71.4 °C. The antibacterial dyed textiles exhibit a softness of 62.24, resilience of 39.10, smoothness of 82.16, K / S of 17.2, ΔE of 1.25, dry and wet rubbing fastness of grade 5, washing fastness of grade 4, and air permeability retention of 90.3%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 98.2%, 97.5%, and 94.1%, respectively, and the antibacterial rates after 50 washes are 90.2%, 88.1%, and 86.8%, respectively.

[0079] Comparative Example 1

[0080] The difference between Comparative Example 1 and Example 1 is that the bio-based antibacterial powder for textiles is a mixture of 90% commercially available powder coating and 10% inorganic antibacterial powder by mass.

[0081] The obtained antibacterial powder coating has a particle size of 80.2 μm. The antibacterial colored textiles exhibit a softness of 23.45, resilience of 79.23, smoothness of 60.25, K / S of 15.2, ΔE of 5.20, dry and wet rubbing fastness of grade 5, washing fastness of grade 4, and air permeability retention rate of 10.8%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reached 79.5%, 75.6%, and 73.2%, respectively, and the antibacterial rates after 50 washes were 59.4%, 55.6%, and 52.8%, respectively.

[0082] Comparative Example 2

[0083] The difference between Comparative Example 2 and Example 1 is that the amount of vinyltrimethylsiloxane used is 0g.

[0084] The resulting bio-based antibacterial powder for textiles has a particle size of 290.6 nm. The antibacterial dyed textiles exhibit a softness of 59.21, resilience of 39.52, smoothness of 80.18, K / S of 16.1, ΔE of 1.31, and achieve a dry and wet rubbing fastness of grade 5, a wash fastness of grade 4, and an air permeability retention rate of 84.3%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 97.5%, 94.4%, and 93.6%, respectively, and the antibacterial rates after 50 washes are 82.4%, 79.9%, and 76.2%, respectively.

[0085] Comparative Example 3

[0086] The difference between Comparative Example 3 and Example 1 is that the amount of butyl methacrylate monomer used is 12.5g and the amount of butyl acrylate used is 0g.

[0087] The resulting bio-based antibacterial powder for textiles has a particle size of 275.6 nm. The antibacterial dyed textiles exhibit a softness of 60.35, resilience of 38.13, smoothness of 81.64, K / S ratio of 16.8, ΔE of 1.61, dry and wet rubbing fastness of grade 5, washing fastness of grade 4, and air permeability retention of 89.7%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 96.5%, 93.4%, and 92.3%, respectively, and the antibacterial rates after 50 washes are 88.4%, 86.2%, and 82.1%, respectively.

[0088] Comparative Example 4:

[0089] The difference between Comparative Example 4 and Example 1 is that the bio-based antibacterial powder for textiles is a commercially available quaternary ammonium salt chitosan antibacterial agent, added at a concentration of 1%, along with 10g of deionized water, 0.2g of thickener, 0.1g of curcumin, and 0.1g of dispersant DM1501. The fabric was coated by padding, dried at 60°C, and then hot-rolled at 160°C to obtain the antibacterial colored fabric.

[0090] The antibacterial dyed textiles exhibit a softness of 50.44, resilience of 51.30, smoothness of 79.16, K / S of 13.85, ΔE of 3.25, dry and wet rubbing fastness of 4-5, washing fastness of 3-4, and air permeability retention of 85.5%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 98.2%, 96.8%, and 91.2%, respectively, with antibacterial rates of 60.5%, 55.8%, and 50.2% after 50 washes.

[0091] Comparative Example 5:

[0092] The difference between Comparative Example 5 and Example 1 is that, in preparing the bio-based antibacterial powder for textile dyeing, 10% of commercially available quaternary ammonium salt chitosan antibacterial agent was first added to 100g of deionized water, along with 2g of thickener, 1g of curcumin, and 1.5g of dispersant DM1501; then, the bio-based antibacterial powder for textiles was obtained by spray drying. Other conditions remained unchanged.

[0093] The obtained bio-based antibacterial powder for textiles has a particle size of 405.6 nm and a glass transition temperature of 55.1℃. The antibacterial dyed textiles exhibit a softness of 55.64, resilience of 52.02, smoothness of 80.21, K / S of 12.12, ΔE of 4.31, dry and wet rubbing fastness both reaching grade 4, washing fastness of grade 3-4, and air permeability retention of 82.3%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 92.3%, 90.8%, and 92.2%, respectively, and the antibacterial rates after 50 washes are 55.6%, 52.2%, and 50.3%, respectively.

[0094] Comparative Example 6:

[0095] The difference between Comparative Example 6 and Example 1 is that, in preparing the bio-based antibacterial powder for textile dyeing, the amount of methyl methacrylate used is 2.5g and the amount of butyl acrylate used is 10g.

[0096] The resulting bio-based antibacterial powder for textiles has a particle size of 826.6 nm and a glass transition temperature of 40.6 °C. The antibacterial dyed textiles exhibit a softness of 58.29, resilience of 51.65, smoothness of 79.28, K / S of 13.2, ΔE of 4.82, and both dry and wet rubbing fastness are grade 3, as is the washing fastness grade 3. The air permeability retention rate is 85.3%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 96.8%, 95.2%, and 93.1%, respectively, and the antibacterial rates after 50 washes are 89.2%, 86.8%, and 82.6%, respectively.

[0097] Comparative Example 7:

[0098] The difference between Comparative Example 7 and Example 1 is that the colorant used in preparing the bio-based antibacterial powder for textile coloring is Disperse Yellow 23.

[0099] The resulting bio-based antibacterial powder for textiles has a particle size of 21 μm and a glass transition temperature of 60.8℃. The antibacterial dyed textiles exhibit a softness of 58.28, resilience of 50.18, smoothness of 75.96, K / S of 9.28, ΔE of 5.67, dry and wet rubbing fastness of grade 3, washing fastness of grade 2, and air permeability retention of 75.6%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reach 92.8%, 91.1%, and 92.0%, respectively, with antibacterial rates of 59.2%, 54.6%, and 52.1% after 50 washes.

[0100] Comparative Example 8:

[0101] The difference between Comparative Example 8 and Example 1 is that, in preparing the bio-based antibacterial powder for textile dyeing, 5g of quaternary ammonium salt chitosan, 1g of curcumin, and 1.5g of dispersant DM1501 were uniformly dispersed in water and ground until uniformly dispersed to prepare an aqueous phase. In subsequent steps, the amount of quaternary ammonium salt chitosan was 0, while other conditions remained unchanged.

[0102] The resulting bio-based antibacterial powder for textiles has a particle size of 318.5 nm and a glass transition temperature of 60.8℃. The antibacterial dyed textiles exhibit a softness of 65.48, resilience of 39.20, smoothness of 81.28, K / S of 16.1, ΔE of 2.32, dry and wet rubbing fastness both reaching grade 4, washing fastness of grade 3-4, and air permeability retention of 88.1%. The antibacterial rates against Escherichia coli, Staphylococcus aureus, and Candida albicans reached 81.2%, 79.1%, and 77.6%, respectively, with antibacterial rates of 58.2%, 52.1%, and 58.6% after 50 washes.

[0103] The embodiments provided above are not intended to limit the scope of the invention, nor are the described steps intended to limit the order of execution. Any obvious modifications made to the invention by those skilled in the art based on existing common knowledge also fall within the scope of protection defined by the claims.

Claims

1. A bio-based antibacterial powder for textile coloring, characterized in that: The bio-based antibacterial powder is a nano colored particle with a core-shell structure, and the mass ratio of the core to the shell is 1:1-3; wherein the core includes a colorant, and the shell is a polymer formed by polymerizing a bio-based antibacterial monomer, a polymer monomer, a silicon-modified monomer and a dispersant; the bio-based antibacterial monomer includes a chitosan derivative, the polymer monomer includes at least one of styrene, methyl methacrylate, acrylonitrile, butyl acrylate, ethyl acrylate, isooctyl acrylate, and hydroxyethyl acrylate, and the silicon-modified monomer includes siloxane.

2. The bio-based antibacterial powder according to claim 1, characterized in that: The colorant is a natural colorant, including at least one of beet red, curcumin, spirulina blue, purple cabbage extract, carotenoids, cochineal red, spinach green, and safflower yellow; the chitosan derivative includes at least one of quaternized chitosan derivatives, acylated chitosan derivatives, carboxylated chitosan derivatives, and alkylated chitosan derivatives; the polymer monomer includes a hard monomer and a soft monomer, the hard monomer includes one or more of acrylic acid, styrene, methyl methacrylate, acrylonitrile, and methacryloyloxyethyl trimethylammonium chloride; the soft monomer includes one or more of butyl acrylate, ethyl acrylate, isooctyl acrylate, and hydroxyethyl acrylate. 。 3. The bio-based antibacterial powder according to claim 2, characterized in that: The mass ratio of the bio-based antibacterial monomer to the colorant is 1:10-20, and the mass ratio of the bio-based antibacterial monomer, the hard monomer and the soft monomer is 1-2:1:0.2-2.

4. The bio-based antibacterial powder according to claim 1, characterized in that: The silicon-modified monomer includes at least one of vinyl trimethoxysilane (VTMS), vinyl-terminated polydimethylsiloxane, γ-(methacryloyloxy)propyl trimethoxysilane, vinyl tri(methoxyethoxy)silane, and vinyl triisopropoxysilane. The amount of the silicon-modified monomer is 1-10% of the mass of the polymer monomer.

5. The bio-based antibacterial powder according to claim 1, characterized in that: The dispersant includes one or more of DNS-86, SR-10, DM-1501, sodium p-styrene sulfonate, sodium dodecylbenzene sulfonate, and sodium dodecyl sulfate. The mass ratio of the dispersant to the colorant is 0.5-2:

1.

6. A method for preparing the bio-based antibacterial powder for textile coloring according to any one of claims 1 to 5, characterized in that: The following steps are involved: 1) Preparation of aqueous phase: uniformly dispersing the colorant and dispersant in water, grinding and dispersing them uniformly to prepare an aqueous phase; 2) Preparation of oil phase: uniformly mixing the polymer monomer and the silicon-modified monomer to prepare the oil phase; 3) Preparation of dispersion: slowly add the oil phase to the water phase, raise the temperature to 75°C, add the initiator, stir mechanically at a speed of 200-800 rpm, mix evenly to obtain a mixed solution, and slowly drop the oil phase into the mixed solution at a speed of 10-20s / drop, react for 4-8h, cool the material, add the bio-based antibacterial monomer, stir and mix evenly to obtain a dispersion of nano colored particles; 4) Powder preparation: The dispersion of nano colored particles is passed into a spray dryer, and the bio-based antibacterial powder for textile coloring is obtained through spraying, hot air drying, cyclone separation, and cooling steps. The inlet air temperature of the spray dryer is 100-230°C, and the outlet air temperature is 50-120°C.

7. The preparation method according to claim 6, characterized in that: The initiator includes one or more of azobisisobutyronitrile persulfate (AIBN), ammonium persulfate (APS), potassium persulfate, and azobisisobutylamidine dihydrochloride (AIBA), and the added amount of the initiator is 1-5% of the total mass of the oil phase.

8. An application of the bio-based antibacterial powder for textile coloring according to any one of claims 1 to 5 in textile coloring, wherein the application is to spray the bio-based antibacterial powder for textile coloring on pre-treated textiles by electrostatic spraying, and then hot rolling to obtain colored textiles.

9. The use according to claim 8, characterized in that: The electrostatic spraying process is as follows: the electrostatic voltage is 30-80 kV, the electrostatic current is 3-15 μA, the spraying distance is 5-20 cm, the atomizing gas pressure is 0.3-0.7 MPa, and the spraying thickness is 10-100 μm.

10. The use according to claim 8, characterized in that: The temperature of the hot rolling roller is 130-180°C and the pressure is 0.8-1.5Kg / cm 2 The pre-treatment includes one or more of immersion treatment, adhesive coating, conductive yarn embedding, and conductive liquid coating.