Dustless cloth with high water absorption and antibacterial performance

Abstract

The present application relates to the technical field of dust-free cloth, in particular to a high water absorption and antibacterial performance dust-free cloth. The present application overcomes the problem of poor water absorption and antibacterial performance of dust-free cloth. The present application realizes the removal of impurities on the surface of the fiber through the synergistic effect of ultrasonic cleaning of soap solution and esterase, and improves the water absorption performance of the fabric. The water absorption and antibacterial performance of the dust-free cloth are improved by activating the pretreated fabric and immersing it in the modified liquid. Through the lysozyme-chitosan composite antibacterial system, the limitation of single antibacterial mechanism is broken, and vacuum impregnation and freeze-drying are combined, so that the dust-free cloth can continuously release antibacterial substances during use, effectively inhibiting the growth of bacteria. Through the post-processing steps of plasma treatment and hot air circulation oven curing, the water absorption and antibacterial performance of the dust-free cloth are further optimized.

Description

Technical Field

[0001] This invention relates to the field of cleanroom cloth technology, specifically a cleanroom cloth with high absorbency and antibacterial properties. Background Technology

[0002] Cleanroom wipes are generally made of synthetic fibers (such as polyester, polypropylene, nylon, etc.) or natural fibers (such as cotton). Synthetic fiber cleanroom wipes are advantageous due to their high strength, durability, and resistance to mold, making them suitable for demanding industrial cleaning applications. However, the molecular chain structure of synthetic fibers is typically quite stable, making it difficult for moisture to penetrate the fiber interior, resulting in poor absorbency. Traditional modification methods (such as surface hydrophilic agent coating and copolymerization) rely on chemical cross-linking, leading to problems like solvent contamination and easy shedding of the functional layer. Therefore, fiber functionalization based on biochemical methods (enzyme catalysis, microbial metabolites, and natural biomaterial composites) has become a research hotspot.

[0003] Enzyme treatment is widely recognized as a green production process that meets environmental protection requirements. It not only improves and enhances the antibacterial properties of textiles but also contributes to ecological protection due to its non-toxicity, low dosage, biodegradability of wastewater, and lack of pollution. Bio-enzymes, as non-toxic, harmless, and environmentally friendly biocatalysts, are widely used in the textile industry due to advancements in biochemical engineering technology and the increasing demand for green textile processing. However, current technologies typically use enzymes or microorganisms in isolation, making it difficult to simultaneously address the needs for water absorption and antibacterial properties. Therefore, developing a clean fabric with excellent water absorption, long-lasting antibacterial properties, and no dust generation has become an urgent need in the medical industry.

[0004] To address this, a dust-free cloth with high absorbency and antibacterial properties was proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a cleanroom cloth with high absorbency and antibacterial properties. Through ultrasonic cleaning with soap solution and the synergistic effect of esterase, impurities on the fiber surface are removed, improving the fabric's absorbency. Activation of the pre-treated fabric followed by impregnation in a modified solution further enhances the cloth's absorbency and antibacterial properties. A lysozyme-chitosan composite antibacterial system overcomes the limitations of single antibacterial mechanisms; combined with vacuum impregnation and freeze-drying, the cloth continuously releases antibacterial substances during use, effectively inhibiting bacterial growth. Post-treatment steps, including plasma treatment and hot air circulating oven curing, further optimize the cloth's absorbency and antibacterial properties.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] It should be noted that all parts in this invention are parts by weight.

[0008] This invention provides a cleanroom cloth with high absorbency and antibacterial properties. The preparation method of the cleanroom cloth is as follows:

[0009] S1 The fabric is washed and dried, then immersed in an enzyme treatment solution with a bath ratio of 1:20. The solution is kept at 45°C and shaken for 2-4 hours. After the reaction is completed, the enzyme is inactivated by treatment in 80°C hot water for 10 minutes. Then, the fabric is rinsed with deionized water until neutral and dried to obtain the pretreated fabric.

[0010] S2 activates the pretreated fabric and then immerses it in a modification solution at 45°C. It is then ultrasonically treated (40kHz, 200W) for 20 minutes to allow carboxymethyl chitosan / polyethyleneimine to be adsorbed onto the fiber surface through electrostatic interaction. Next, 5wt% sodium bicarbonate solution is added to promote the deposition of CaP nanoparticles in the fiber pores. After stirring at 60°C for 1 hour, the fabric is taken out, rinsed three times with deionized water, and dried with hot air at 45°C to obtain the modified fabric.

[0011] S3 immerses the modified fabric in an antibacterial agent loading solution, sonicates it at 45°C for 30 minutes, and then vacuum impregnates and freeze-dries it to obtain the antibacterial agent loaded fabric.

[0012] S4 After plasma treatment of the antibacterial agent-loaded fabric, it is cured in a hot air circulating oven for 3 minutes to obtain a dust-free cloth.

[0013] The enzyme treatment solution was obtained by dissolving esterase in phosphate buffer;

[0014] The modified solution was prepared from carboxymethyl chitosan, citric acid, nano-calcium phosphate, and polyethyleneimine.

[0015] The antibacterial agent loading solution was prepared from lysozyme and chitosan.

[0016] Preferably, the cleaning steps in S1 are as follows: add the fabric to the soap solution, ultrasonically vibrate for 30 minutes, and then rinse with clean water; the soap solution is a mixture of detergent and deionized water with a concentration of 5g / L and a liquor ratio of 1:30-50; the detergent is 209 detergent.

[0017] Preferably, the enzyme treatment solution in S1 is prepared as follows: 2.8 parts and 15.1 parts of disodium hydrogen phosphate are dissolved in 800 parts of deionized water and stirred until completely dissolved. After mixing, the pH is calibrated to 7.5 using a pH meter and the volume is adjusted to 1000 parts to obtain a phosphate solution. Phosphate buffer is added to a container, and 30-50 parts of esterase are added. The mixture is stirred at 500 rpm until completely dissolved. 1.5 parts of Triton X-100 and 15 parts of glycerol are added and the mixture is stirred for 10 minutes to obtain the enzyme treatment solution.

[0018] Preferably, the activation step in S2 is as follows: immerse the pretreated fabric in dilute hydrochloric acid with a pH of 5.5 and shake for 15 minutes.

[0019] Preferably, the modified solution in S2 is prepared as follows: 15 parts of carboxymethyl chitosan are added to 100 parts of deionized water preheated to 50°C and stirred until completely dissolved. 0.1M dilute hydrochloric acid is added to adjust the pH to 5.5 to obtain a carboxymethyl chitosan solution. 3 parts of polyethyleneimine are dissolved in 50 parts of deionized water and stirred until clear. The carboxymethyl chitosan solution is then added to obtain a composite colloid. 8-15 parts of citric acid are dissolved in 100 parts of deionized water preheated to 45°C. The composite colloid is added, and the temperature is raised to 55-65°C. The mixture is stirred at 800 rpm for 30 minutes to obtain a composite solution. 5 parts of nano-calcium phosphate and 10 parts of polyethylene glycol (PEG-400) are mixed and sonicated for 30 minutes to obtain a suspension. The suspension is added dropwise to the composite solution at a rate of 2 mL / min, and high-speed shear dispersion is applied simultaneously. The volume is then adjusted to 1000 parts with deionized water and stored at 4°C in the dark to obtain the modified solution.

[0020] Preferably, the preparation method of the antibacterial agent loading solution in S3 is as follows: 10 parts of chitosan powder are added to acetic acid solution and stirred at 50°C for 6 hours. After cooling to 30°C, 1-3.5 parts of lysozyme are added and stirred for 30 minutes. 60 parts of glycerol are added and the volume is adjusted to 1000 parts with deionized water. The solution is filtered through a 0.45 μm filter membrane and then sterilized with ethylene oxide gas to obtain the antibacterial agent loading solution.

[0021] Preferably, in S3, vacuum impregnation is performed at -80 kPa for 30-45 min; freeze drying is performed at -50°C for 24 h.

[0022] Preferably, in S4, the plasma processing power is 150-210W, the pressure is 50-70Pa, the processing time is 90s, and the working gas is oxygen.

[0023] Preferably, the fabric in S1 is one of polyester and polyester-nylon; the fabric structure is one of straight weave, mesh weave and PK weave.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. This invention utilizes the synergistic effect of ultrasonic soap cleaning and esterase to remove impurities from the fiber surface, thereby improving the fabric's absorbency. The surfactants in the soap solution remove deep-seated oil residues from the fibers, while the esterase directionally hydrolyzes oligomers and ester contamination layers on the polyester fiber surface, significantly reducing surface roughness and hydrophobicity. The phosphate buffer system of the enzyme treatment solution stabilizes enzyme activity and simultaneously repairs micro-damage to the fibers, exposing more hydroxyl and carboxyl active sites, which facilitates better adhesion and penetration of subsequent modification solutions and antibacterial agent loading solutions. Furthermore, enzyme treatment is a gentle biochemical process that does not excessively damage the original structure of the fabric, ensuring its strength and durability.

[0026] 2. In this invention, ultrasonic activation in S2 expands the micropores of the fiber, promoting the deep penetration of the carboxymethyl chitosan / polyethyleneimine composite colloid into the fiber pores. Furthermore, the cationic groups on the surface of polyethyleneimine firmly bind to the lysozyme in S3 through electrostatic adsorption. Esterification and cross-linking of citric acid form a dense carboxyl network on the fiber surface, endowing it with dynamic water molecule adsorption capacity. Nano-calcium phosphate and polyethylene glycol form spherical micro-water storage units embedded within these units, with capillary action enhancing the water absorption rate. The addition of sodium bicarbonate triggers a pH jump in the system through a neutralization reaction: on the one hand, it solidifies the cross-linked network, preventing the functional layer from dissolving; on the other hand, it induces the electrostatic self-assembly of nano-calcium phosphate and chitosan to form an ionic antibacterial gate, inhibiting microbial adhesion and metabolism.

[0027] 3. This invention overcomes the limitations of single antibacterial mechanisms by utilizing a lysozyme-chitosan composite antibacterial system. Through steps such as ultrasonic treatment, vacuum impregnation, and freeze-drying, the antibacterial agent is effectively loaded onto the fabric. Lysozyme achieves targeted sterilization by lysing the peptidoglycan layer of bacterial cell walls, while chitosan disrupts the microbial membrane potential through protonated amino groups, establishing a barrier to inhibit microbial metabolism. Vacuum impregnation and freeze-drying allow the antibacterial agent to penetrate deeper into the internal structure of the fabric while maintaining its activity. This ensures that the cleanroom fabric continuously releases antibacterial substances during use, effectively inhibiting bacterial growth and improving both the antibacterial and absorbency properties of the cleanroom fabric.

[0028] 4. This invention further optimizes the water absorption and antibacterial properties of cleanroom fabrics through two post-treatment steps: plasma treatment and hot air circulating oven curing. Oxygen plasma etching introduces nanoscale pits and oxygen-containing polar groups on the fiber surface, expanding the pore size and increasing the fabric's hydrophilicity. These oxygen-containing groups can form hydrogen bonds with water molecules, thereby improving the fabric's water absorption capacity. Simultaneously, plasma treatment can also improve the surface roughness of the fabric, increasing the specific surface area and further enhancing water absorption performance. Hot air circulating oven curing allows antibacterial agents and modified components to be better fixed on the fabric, improving the bonding strength and ensuring the stability of antibacterial and water absorption properties. Attached Figure Description

[0029] Figure 1 This is a process flow diagram for preparing the highly absorbent and antibacterial cleanroom cloth of the present invention;

[0030] Figure 2 These are photographs of the antibacterial effect of the lint-free cloth on Escherichia coli before (a) and after (b) treatment in Example 7 of the present invention.

[0031] Figure 3 These are photographs showing the antibacterial effect of the cleanroom cloth on Staphylococcus aureus before (a) and after (b) treatment in Example 7 of the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0033] Please see Figure 1 This invention provides a cleanroom fabric with high absorbency and antibacterial properties. After washing and drying, the fabric is impregnated in an enzyme-treated solution, followed by hydrochloric acid activation and impregnation in a modified solution. It is then immersed in an antibacterial agent loading solution and subjected to vacuum impregnation and freeze-drying. Finally, it undergoes plasma treatment and hot air circulation curing to obtain the cleanroom fabric. The technical solution is as follows:

[0034] The material information involved in this invention is as follows:

[0035] Sodium bicarbonate CAS: 144-55-8; Disodium hydrogen phosphate CAS: 7558-79-4; Sodium dihydrogen phosphate CAS: 89140-32-9; Esterase CAS: 9016-18-6; Triton X-100 CAS: 9002-93-1; Glycerin CAS: 56-81-5; Carboxymethyl chitosan CAS: 83512-85-0; Polyethyleneimine CAS: 9002-98-6; Citric acid CAS: 77-92-9; Calcium phosphate CAS: 10103-46-5; Chitosan CAS: 9012-76-4; Lysozyme CAS: 12650-88-3; Ethylene oxide CAS: 75-21-8; 209 detergent was purchased from Wuhan Jiyesheng Chemical Co., Ltd.; Polyethylene glycol PEG-400 was purchased from Zhengzhou Tongli Surfactant Co., Ltd.

[0036] Example 1

[0037] S1 involves adding straight-weave polyester fabric to soap solution, ultrasonically vibrating for 30 minutes, rinsing with clean water and drying, then immersing it in enzyme treatment solution with a liquor ratio of 1:20 and reacting at a constant temperature of 45℃ for 2 hours. After the reaction is complete, the enzyme is inactivated by treatment in hot water at 80℃ for 10 minutes. Subsequently, it is rinsed with deionized water until neutral and dried to obtain the pretreated fabric. The soap solution is a mixture of detergent and deionized water with a concentration of 5 g / L and a liquor ratio of 1:30. The detergent is 209 detergent.

[0038] S2 The pretreated fabric was immersed in dilute hydrochloric acid (0.1M) at pH 5.5 and shaken for 15 min. Then it was immersed in a modification solution at 45℃ and ultrasonically treated (40kHz, 200W) for 20 min to allow carboxymethyl chitosan / polyethyleneimine to be adsorbed onto the fiber surface through electrostatic interaction. Then 5wt% sodium bicarbonate solution was added dropwise to promote the deposition of calcium phosphate nanoparticles in the fiber pores. After stirring at 60℃ for 1 h, the fabric was taken out and rinsed three times with deionized water. It was then dried with hot air at 45℃ to obtain the modified fabric.

[0039] S3 immersed the modified fabric in an antibacterial agent loading solution, sonicated it at 45°C for 30 min, then vacuum impregnated it at -80 kPa for 30 min, then placed it in an environment at 0°C for 15 min, and then freeze-dried it at -50°C for 24 h to obtain the antibacterial agent loading fabric.

[0040] S4 places the antibacterial agent-loaded fabric in an environment of 5°C for 30 minutes, then performs oxygen plasma treatment for 90 seconds under the conditions of 150W power and 50Pa pressure, and then cures it in a 60°C hot air circulating oven for 3 minutes to obtain a dust-free cloth.

[0041] The enzyme treatment solution was prepared as follows: 2.8 parts sodium dihydrogen phosphate and 15.1 parts disodium hydrogen phosphate were dissolved in 800 parts deionized water and stirred until completely dissolved. After mixing, the pH was calibrated to 7.5 using a pH meter and the volume was adjusted to 1000 parts to obtain a phosphate solution. Phosphate buffer was added to a container, and 30 parts esterase were added. The mixture was stirred at 500 rpm until completely dissolved. 1.5 parts Triton X-100 and 15 parts glycerol were added, and the mixture was stirred for another 10 minutes to obtain the enzyme treatment solution.

[0042] The modified solution was prepared as follows: 15 parts of carboxymethyl chitosan were added to 100 parts of deionized water preheated to 50°C and stirred until completely dissolved. 0.1M dilute hydrochloric acid was added to adjust the pH to 5.5 to obtain a carboxymethyl chitosan solution. 3 parts of polyethyleneimine were dissolved in 50 parts of deionized water and stirred until clear. The carboxymethyl chitosan solution was then added to obtain a composite colloid. 8 parts of citric acid were dissolved in 100 parts of deionized water preheated to 45°C. The composite colloid was added, and the temperature was raised to 55°C. The mixture was stirred at 800 rpm for 30 min to obtain a composite solution. 5 parts of nano-calcium phosphate and 10 parts of polyethylene glycol (PEG-400) were mixed and sonicated (40kHz, 300W) for 30 min to obtain a suspension. The suspension was added dropwise to the composite solution at a rate of 2 mL / min, and high-speed shear dispersion (12000 rpm, 15 min) was applied simultaneously. The volume was then adjusted to 1000 parts with deionized water and stored in the dark at 4°C to obtain the modified solution.

[0043] The method for preparing the antibacterial agent loading solution is as follows: 10 parts of chitosan powder are added to acetic acid solution and stirred at 50°C for 6 hours. After cooling to 30°C, 1 part of lysozyme is added and stirred for 30 minutes. 60 parts of glycerol are added and the volume is adjusted to 1000 parts with deionized water. The solution is filtered through a 0.45 μm filter membrane and then sterilized by γ-ray irradiation to obtain the antibacterial agent loading solution.

[0044] Example 2-10

[0045] The preparation method and parameters of Example 1 are as follows, with specific differences shown in Tables 1 and 2. In Table 1, the shaking time is the constant temperature shaking time when the fabric is immersed in the enzyme treatment solution. In Table 2, the temperature is the temperature rise after adding the composite colloid when preparing the modified solution.

[0046] Table 1. Specific preparation parameters for Examples 2-10 (I)

[0047] Example fabric Soap bath ratio Esterase dosage / serving Oscillation time / h Citric acid dosage / serving Example 2 Straight-weave polyester nylon 1：35 35 2.5 10 Example 3 Textured polyester 1：40 40 3 12 Example 4 Mesh polyester 1：45 45 3.5 15 Example 5 PK textured polyester 1：50 50 4 12 Example 6 PK patterned polyester nylon 1：38 42 2.6 10 Example 7 PK textured polyester 1：45 40 3 10 Example 8 PK textured polyester 1：48 48 3.7 10

[0048] Table 2 Specific preparation parameters for Examples 2-10 (II)

[0049]

[0050]

[0051] Comparative Example 1

[0052] The preparation method and parameters are the same as in Example 1, except that the fabric was not washed in S1.

[0053] Comparative Example 2

[0054] The preparation method and parameters are the same as in Example 1, except that the fabric was not immersed in the enzyme treatment solution after washing in S1.

[0055] Comparative Example 3

[0056] The preparation method and parameters of Example 1 were used, except that Triton X-100 was not added when preparing the enzyme treatment solution.

[0057] Comparative Example 4

[0058] The preparation method and parameters of Example 1 were used, except that glycerol was not added when preparing the enzyme treatment solution.

[0059] Comparative Example 5

[0060] The preparation method and parameters are the same as in Example 1, except that the pretreated fabric was not activated in S2.

[0061] Comparative Example 6

[0062] The preparation method and parameters are the same as in Example 1, except that in S2, the activated pretreated fabric was not immersed in the modified liquid.

[0063] Comparative Example 7

[0064] The preparation method and parameters of Example 1 are the same, except that sodium bicarbonate solution was not added after ultrasonic treatment in S2.

[0065] Comparative Example 8

[0066] The preparation method and parameters of Example 1 are the same, except that citric acid was not added when preparing the modified liquid.

[0067] Comparative Example 9

[0068] The preparation method and parameters of Example 1 are the same, except that nano-calcium carbonate was not added when preparing the modified liquid.

[0069] Comparative Example 10

[0070] The preparation method and parameters of Example 1 are the same, except that polyethyleneimine was not added when preparing the modified liquid.

[0071] Comparative Example 11

[0072] The preparation method and parameters of Example 1 are the same, except that in S2, no ultrasonic assistance was applied when the pretreated fabric was activated and then immersed in the modified liquid.

[0073] Comparative Example 12

[0074] The preparation method and parameters are the same as in Example 1, except that the modified fabric was not treated in step S3.

[0075] Comparative Example 13

[0076] The preparation method and parameters are the same as in Example 1, except that vacuum impregnation was not performed in step S3.

[0077] Comparative Example 14

[0078] The preparation method and parameters are the same as in Example 1, except that in step S3, freeze drying is replaced with room temperature static drying.

[0079] Comparative Example 15

[0080] The preparation method and parameters are the same as in Example 1, except that plasma treatment was not performed in S4.

[0081] Comparative Example 16

[0082] The preparation method and parameters are the same as in Example 1, except that hot air circulating oven curing was not performed in S4.

[0083] Comparative Example 17

[0084] This comparative example uses the original cleanroom cloth fabric, without any treatment.

[0085] Test case

[0086] Antimicrobial performance test: Referring to the standard GB / T20944.3-2008 "Evaluation of antimicrobial properties of textiles - Part 3: Shaking method", the antimicrobial properties of experimental cases and comparative examples, as well as original fabric samples, were determined using Escherichia coli and Staphylococcus aureus.

[0087] Water absorption performance and cleanliness test: The test results were conducted according to the company's test instructions for water absorption capacity and absorption rate of wiping cloths; the test results are shown in Table 3.

[0088] Table 3 shows the water absorption capacity, water absorption rate, antibacterial rate, and cleanliness tests of Examples 1-8 and Comparative Examples 1-17.

[0089]

[0090]

[0091] As shown in Table 3, in Examples 1-8, the synergistic effect of pretreatment, modification, antibacterial loading, and posttreatment significantly improved the absorbency and antibacterial properties of the cleanroom cloth. Specifically, targeted enzyme treatment cleans the fiber surface and constructs a microporous structure, laying the foundation for the uniform loading of the carboxymethyl chitosan / calcium phosphate composite coating; acid activation and amphoteric colloid modification form multiple nano-adsorption sites, enhancing fiber hydrophilicity and increasing absorbency through water storage in the calcium phosphate pores; vacuum impregnation combined with freeze-drying ensures deep penetration and activity retention of the antibacterial agent (lysozyme-chitosan), forming a long-lasting synergistic antibacterial network with the surface coating; and plasma treatment combined with thermal curing enhances the rapid absorption of water through surface etching while simultaneously solidifying the anchoring effect of the antibacterial agent, preventing swelling and detachment. These four interconnected processes deeply couple the fiber surface microstructure, interfacial bonding strength, and functional component distribution, ultimately achieving a breakthrough in the integrated absorption, antibacterial durability, and cleanliness of the cleanroom cloth. The absorbency of the cleanroom cloth produced was 312-367 mL / m. 2 The water absorption rate is 1.0-1.1 s, the inhibition rate against Escherichia coli is 92.82%-96.93%, the inhibition rate against Staphylococcus aureus is 93.03%-98.95%, and the airborne particulate matter emission (APC) is 117-125 Ea / ft. 3 The amount of dust particles released from the liquid is 17-25 Ea / cm³. 2 It has good water absorption and antibacterial properties.

[0092] In Comparative Example 1, the fabric surface in S1, which was not washed with soap, contained residual oil, spinning auxiliaries, and other hydrophobic impurities, which blocked the fiber pores. Esterases could not effectively contact the ester contaminants, resulting in impaired hydrophilicity of the fiber surface and a decreased water absorption rate. Furthermore, the contaminants covering the fiber surface inhibited the chemical anchoring and physical adsorption of the antibacterial agent, reducing the lysozyme loading and significantly weakening the antibacterial activity. In Comparative Example 2, the fabric in S1 was not immersed in the enzyme treatment solution after washing. The lack of enzyme treatment meant that the oligomers and ester residues on the fiber surface were not hydrolyzed, and the fiber surface remained hydrophobic. Moreover, enzymatic hydrolysis could expose hydroxyl groups; without enzymatic hydrolysis, the binding sites between the antibacterial agent and the fiber decreased, leading to a decline in antibacterial performance. Triton X-100 is a nonionic surfactant that does not disrupt the charged state of enzyme proteins, avoiding the conformational changes or inactivation of enzymes caused by strong charge interference from ionic surfactants (such as SDS). It reduces the surface tension of the enzyme treatment solution, allowing the enzyme to penetrate more easily into the fabric fibers and improving the enzyme treatment effect. In Comparative Example 3, Triton X-100 was not added when preparing the enzyme treatment solution, resulting in weakened enzyme penetration, minimal improvement in fabric structure, and limited improvement in water absorption. Furthermore, the remaining lipid layer hindered the hydrogen bonding between the antibacterial agent and the fiber, reducing the lysozyme loading density and affecting antibacterial performance. Glycerin has a moisturizing effect, helping to maintain enzyme activity and stability, allowing the enzyme to function better during treatment. In Comparative Example 4, the absence of glycerin in the enzyme treatment solution led to increased enzyme inactivation during prolonged reaction at 45°C, insufficient fiber surface cleanliness, and decreased penetration of the subsequent modification solution. The activation step exposes more carboxyl and hydroxyl groups through acid treatment. In Comparative Example 5, the pretreated fabric was not activated in S2, resulting in reduced surface reactivity, decreased carboxymethyl chitosan adsorption, and reduced water absorption capacity. The electrostatic bonding strength between polyethyleneimine and the fiber was insufficient, disrupting the continuity of the chitosan film and reducing the adhesion strength of the antibacterial agent. The modification solution is the core for constructing a three-dimensional hydrophilic network. In Comparative Example 6, the activated pretreated fabric was not immersed in the modification solution, resulting in the absence of a carboxymethyl chitosan cross-linking layer on the fabric surface. Water absorption channels relied solely on natural fiber pores, leading to a reduced water absorption rate. Without a polyethyleneimine / chitosan composite layer, the antibacterial agent could not form loading sites on the fiber surface, reducing its antibacterial activity. Neutralization with sodium bicarbonate induces the directional deposition of nano-calcium phosphate. In Comparative Example 7, no sodium bicarbonate solution was added after ultrasonic treatment in S2, resulting in disordered dispersion of nanoparticles, uneven pore size distribution of water storage channels, and reduced water absorption capacity. The absence of an ion gate composed of calcium phosphate and chitosan increased bacterial adhesion. Citric acid, as a crosslinking agent, can promote the crosslinking reaction between components such as carboxymethyl chitosan and polyethyleneimine, forming a stable network structure and improving the water absorption performance of the fabric. In Comparative Example 8, citric acid was not added when preparing the modified liquid, so the network structure could not be effectively formed, and the water absorption performance was reduced. The lack of crosslinking structure will affect the loading and stability of the antibacterial agent, making the antibacterial agent easy to fall off and reducing the antibacterial performance.Nano-calcium carbonate can increase the porosity and specific surface area of ​​fabrics, which is beneficial for water absorption and retention. In Comparative Example 9, nano-calcium carbonate was not added when preparing the modified liquid, resulting in the loss of the micro-water storage function of nano-calcium phosphate, reduced water absorption capacity, and decreased capillary efficiency. Furthermore, the lack of a calcium ion slow-release system prevented the inhibition of bacterial metabolism through ion interference. In Comparative Example 10, polyethyleneimine was not added when preparing the modified liquid. The lack of cationicity in polyethyleneimine reduced the binding force between the composite colloid and the fiber, preventing the formation of an effective water-absorbing structure and reducing water absorption performance. Additionally, the absence of positive charge to attract negatively charged bacterial cell membranes led to poor targeting of lysozyme and a decrease in contact antibacterial rate. In Comparative Example 11, no ultrasonic assistance was applied when immersing the pretreated fabric in the modified liquid after activation in step S2. The modified liquid only adhered to the fiber surface, resulting in insufficient pore penetration depth and decreased water absorption and antibacterial properties. In Comparative Example 12, the modified fabric did not undergo the treatment in step S3, resulting in poor water absorption and antibacterial properties of the cleanroom cloth. Vacuum impregnation removes air from the fabric pores, allowing the antibacterial agent to penetrate more fully into the fabric, increasing its loading and uniformity. In Comparative Example 13, vacuum impregnation was not performed in step S3, resulting in insufficient penetration of the antibacterial agent into the fabric, thus affecting its water absorption and antibacterial properties. Freeze-drying maintains the fabric's pore structure and the activity of the antibacterial agent. In Comparative Example 14, freeze-drying was replaced with room temperature drying in step S3. The slow evaporation of moisture led to uneven distribution of hydrophilic components, affecting the overall water absorption of the fabric. Furthermore, the binding force between the antibacterial agent and the fabric fibers weakened, making it easier for the antibacterial agent to detach from the fabric during subsequent use. Plasma treatment introduces oxygen-containing groups into the fabric surface, increasing its hydrophilicity. In Comparative Example 15, plasma treatment was not performed in S4, resulting in poor hydrophilicity and affecting water absorption. Curing in a hot air circulating oven allows antibacterial agents and modified components to be better fixed on the fabric, enhancing the stability of the absorbent structure. In Comparative Example 16, no hot air circulating oven curing was performed in S4, resulting in weak fixation of the antibacterial agents and modified components, leading to reduced absorbency and antibacterial properties. In Comparative Example 17, the original cleanroom fabric without any treatment was used. Its inherent absorbency is limited, with low absorption volume and rate. Furthermore, the original fabric lacks any antibacterial agents, offering almost no antibacterial capability and making it prone to bacterial growth.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dustless cloth having high water absorption and antibacterial properties, characterized by: The preparation method of the dust-free cloth is as follows: S1 wash and dry the fabric, immerse it in an enzyme treatment solution, oscillate for 3h to obtain pretreated fabric; the fabric is polyester; S2 after activating the pretreated fabric, immerse it in a modification solution, after ultrasonic treatment, drop sodium bicarbonate solution, stir at 60℃ to obtain modified fabric; the activation step is as follows: immerse the pretreated fabric in dilute hydrochloric acid with pH of 5.5 and oscillate for 15min; S3 immerse the modified fabric in an antibacterial agent loading solution, after ultrasonic treatment, carry out vacuum impregnation and freeze drying to obtain antibacterial agent loading fabric; S4 after plasma treatment of the antibacterial agent loading fabric, solidify in a hot air circulation oven at 60℃ for 3min to obtain dust-free cloth; the plasma treatment power is 180W, the pressure is 60Pa, and the treatment time is 90s; The enzyme treatment solution is obtained by dissolving esterase in phosphate buffer solution; the preparation method of the enzyme treatment solution is as follows: add the phosphate buffer solution in a container, add 40 parts of the esterase, stir until completely dissolved, add Triton X-100 and glycerol and continue stirring to obtain the enzyme treatment solution; The modification solution is prepared from carboxymethyl chitosan, citric acid, nano calcium phosphate and polyethyleneimine; the preparation method of the modification solution is as follows: add the carboxymethyl chitosan in deionized water and stir, add dilute hydrochloric acid to adjust the pH to 5.5 to obtain carboxymethyl chitosan solution; dissolve the polyethyleneimine in deionized water, stir until clear, then add the carboxymethyl chitosan solution to obtain a composite colloid; Dissolve 10 parts of the citric acid in deionized water, add the composite colloid, heat to 60℃, and stir to obtain a composite solution; mix the nano calcium phosphate and polyethylene glycol, and ultrasonically treat to obtain a suspension; add the suspension dropwise to the composite solution, then add deionized water to constant volume to obtain the modification solution; The antibacterial agent loading solution is prepared from lysozyme and chitosan; the preparation method of the antibacterial agent loading solution is as follows: add 10 parts of the chitosan powder to acetic acid solution, stir at 50℃, cool to 30℃, then add 3 parts of the lysozyme and stir, add 60 parts of glycerol and constant volume, filter with filter membrane, then sterilize with ethylene oxide gas to obtain the antibacterial agent loading solution.

2. The dustless cloth with high water absorption and antibacterial performance according to claim 1, characterized in that: The washing step in S1 is as follows: add the fabric to soap solution, ultrasonically oscillate, then rinse with clean water; the soap solution is obtained by mixing detergent and deionized water; the bath ratio is 1:

45.

3. The dustless cloth with high water absorption and antibacterial performance according to claim 1, characterized in that: The vacuum impregnation in S3 is impregnation at-80kPa for 35min; the freeze drying is drying at-50℃ for 24h.

4. The dustless cloth with high water absorption and antibacterial performance according to claim 1, characterized in that: The working gas for plasma treatment in S4 is oxygen.

5. The dustless cloth with high water absorption and antibacterial performance according to claim 1, characterized in that: The structure of the fabric in S1 is pk pattern.

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