Cotton knitted fabric with antibacterial coating and preparation method thereof

Abstract

The invention relates to the technical field of fabric processing, in particular to a cotton knitted fabric with an antibacterial coating and a preparation method of the cotton knitted fabric with the antibacterial coating. The antibacterial coating is prepared from the following raw materials in parts by weight: 20-40 parts of waterborne polyurethane resin, 1-5 parts of nano silver particles, 5-15 parts of nano mica powder, 5-15 parts of active nano calcium carbonate, 10-20 parts of carboxymethylated chitosan, 4-6 parts of silicone oil, 5-15 parts of a film-forming agent, 1-5 parts of a thickening agent, 1-5 parts of a silane coupling agent, 1-5 parts of a surfactant and 1-3 parts of a waterborne closed curing agent. 100 to 200 parts of water; according to the formula, the antibacterial performance of the cotton knitted fabric is remarkably improved, and the problems that in a traditional antibacterial treatment method, the hand feeling becomes hard, air permeability is poor, and durability is weak are effectively solved; good balance between the antibacterial property and the comfort is realized.

Description

Technical Field

[0001] This application relates to the field of fabric processing technology, and more specifically, to a cotton knitted fabric with an antibacterial coating and a method for preparing the same. Background Technology

[0002] Cotton knitted fabric is a type of fabric formed by bending cotton yarns into loops and interlocking them using knitting needles. It is widely used in underwear, T-shirts, sportswear, and home textiles. However, cotton fibers themselves have weak antibacterial properties and are prone to bacterial growth, leading to problems such as odor and mildew in the fabric. Therefore, it is necessary to treat cotton knitted fabrics with antibacterial properties to give them good antibacterial properties.

[0003] Currently, the main methods for improving the antibacterial properties of cotton knitted fabrics are as follows: First, blending antibacterial fibers with cotton fibers can significantly improve the antibacterial performance of cotton knitted fabrics. However, the performance of different fibers varies greatly, and the process parameters need to be precisely controlled during the blending process to ensure uniform fiber mixing. Otherwise, problems such as yarn breakage and sticking may occur during processing. Second, antibacterial hygienic finishing agents can be used to treat cotton knitted fabrics. Antibacterial hygienic finishing agents can effectively inhibit and kill a variety of bacteria and have good antibacterial effects. However, the antibacterial performance of cotton knitted fabrics treated with antibacterial finishing agents may gradually decrease after multiple washes, and the durability is relatively weak. At the same time, antibacterial finishing agents will have certain negative effects on the strength, hand feel, color and other properties of the fabric, such as making the fabric hard, yellowing or reducing tear strength. Third, an antibacterial coating can be applied to cotton knitted fabrics. While the antibacterial coating can effectively avoid the technical problems of the two methods mentioned above, it can also affect the feel of the cotton knitted fabric, greatly reducing its comfort and breathability, thus limiting its application in certain fields where comfort is a high priority. Summary of the Invention

[0004] To address the issue of antibacterial coatings affecting the feel and breathability of cotton knitted fabrics, this application provides a cotton knitted fabric with an antibacterial coating and a method for preparing the same.

[0005] In a first aspect, this application provides a cotton knitted fabric with an antibacterial coating, employing the following technical solution: a cotton knitted fabric with an antibacterial coating, comprising a cotton knitted fabric and an antibacterial coating, wherein the antibacterial coating is prepared from the following raw materials in parts by weight: 20-40 parts of waterborne polyurethane resin 1-5 parts of nano silver particles 5-15 parts of nano mica powder 5-15 parts of active nano calcium carbonate 10-20 parts of carboxymethylated chitosan 4-6 parts silicone oil Film forming agent 5-15 parts Thickening agent 1-5 parts Silane coupling agent 1-5 parts Surfactant 1-5 parts Water-based blocked curing agent 1-3 parts Water 100-200 parts The silicone oil is composed of epoxy-modified silicone oil, methacryloyloxyalkyl silicone oil and hydroxyl silicone oil.

[0006] By adopting the above technical scheme, not only the antibacterial performance of the cotton knitted fabric is significantly improved, but also the problems of poor hand feeling, poor air permeability and weak durability existing in the traditional antibacterial treatment method are effectively solved, a good balance between antibacterial performance and comfort is achieved, and the application range of the cotton knitted fabric in the fields such as underwear, T-shirt and sportswear which have higher requirements for comfort is widened.

[0007] In the present application, the combination of epoxy-modified silicone oil, methacryloyloxyalkyl silicone oil and hydroxyl silicone oil gives the cotton knitted fabric a soft and smooth hand feeling, significantly improves the rough hand feeling problem caused by the traditional antibacterial coating, and makes the fabric touch more delicate and skin-friendly. The epoxy-modified silicone oil has excellent lubricity and hydrophilicity, and can give the cotton knitted fabric a soft and smooth hand feeling. The methacryloyloxyalkyl silicone oil has good film forming property and adhesion, and can make the coating uniformly adhere to the surface of the cotton fiber, further enhance the stability of the coating, and at the same time give the coating a certain elasticity, so that it is not easy to deform in use. The hydroxyl silicone oil has good softness and air permeability, and can further improve the flexibility of the coating, so that the fabric still maintains good air permeability and comfort while maintaining antibacterial performance. The combination of the three makes the coating reach the best balance between softness, smoothness and air permeability, and significantly improves the hand feeling and comfort of the cotton knitted fabric.

[0008] At the same time, the nano mica powder and active nano calcium carbonate are uniformly distributed in the coating, filling the small pores of the coating, making the coating more delicate and uniform, and further improving the hand feeling of the fabric. And the particle size of these nano materials is small, which will not have a negative impact on the softness of the fabric, so as to ensure that the cotton knitted fabric can still maintain good comfort after antibacterial treatment.

[0009] The water-based polyurethane resin has good film-forming property and air permeability, and can form a uniform and air-permeable film on the surface of the cotton knitted fabric. This film structure can effectively prevent the invasion of bacteria, and will not hinder the air circulation inside the fabric, maintaining the original air permeability of the cotton knitted fabric. At the same time, the nano silver particles, nano mica powder and active nano calcium carbonate and other nano materials form a micro-porous structure in the coating, which provides a channel for the exchange of gas, further enhancing the air permeability of the coating. Therefore, even after adding the antibacterial coating, the cotton knitted fabric can still maintain good air permeability, meeting the comfort needs of the human body during wearing.

[0010] The curing agent can cross-link with the resin in the coating to form a stable chemical structure, so that the coating can still maintain good adhesion and antibacterial performance during multiple washing and use. This cross-linked structure enhances the mechanical properties of the coating, enabling it to resist external friction and wear, thereby prolonging the service life of the antibacterial coating.

[0011] The silane coupling agent can improve the compatibility between the nano materials and the resin, making the coating more uniformly adhere to the fabric surface, reducing the peeling and flaking of the coating. At the same time, the silane coupling agent can also enhance the water resistance and chemical resistance of the coating, so that the coating can remain stable in a humid environment or when in contact with detergents and other chemicals, further improving the durability of the coating.

[0012] The reasonable use of film-forming agents and thickening agents optimizes the physical properties of the coating. The film-forming agent can make the coating form a uniform and continuous film structure, avoiding the phenomenon of local over-thickness or over-thin of the coating, thereby reducing the impact on the strength of the fabric. The thickening agent can adjust the viscosity of the coating, making it more uniform during application, further ensuring the quality of the coating. During the preparation of the coating, the surfactant can reduce the surface tension of the liquid, making the components more easily mixed uniformly, ensuring the uniform distribution of the coating on the fabric surface.

[0013] Preferably, the weight ratio of the epoxy-modified silicone oil, the methacryloxyalkyl silicone oil and the hydroxyl silicone oil is (4-5) : 1 : (2-5).

[0014] By using the above technical solution, the amount of epoxy-modified silicone oil, methacryloxyalkyl silicone oil and hydroxyl silicone oil is optimized, the coating is soft and smooth without roughness, the fabric touch is comfortable, the air permeability of the coating is improved, and the problem of stuffiness and poor air permeability of the fabric is avoided. And the coating has strong adhesion and can maintain antibacterial performance for a long time.

[0015] Preferably, the average particle size of the nano mica powder is 100-200 nm, and the average particle size of the active nano calcium carbonate is 50-100 nm.

[0016] By adopting the above technical solution, the particle sizes of the nano-mica powder and the active nano-calcium carbonate are optimized, which helps to form a micro-porous structure in the coating, further enhances the air permeability of the coating, and makes the cotton knitted fabric maintain good air permeability and comfort while being antibacterial. At the same time, the coating is more uniform and delicate, reducing the roughness of the coating, and enhancing the stability of the coating to avoid cracking or peeling of the coating.

[0017] Preferably, the water-based polyurethane resin is Impranil DLP-R of Covestro or water-based polyurethane resin ML-2060 of Shanghai Qizhan New Material Technology Co., Ltd.

[0018] By adopting the above technical solution, the type of water-based polyurethane resin is optimized, further improving the hand feeling, air permeability, comfort and adhesion stability of the fabric.

[0019] Preferably, the water-based blocked curing agent includes at least one of caprolactam, imidazole, sodium bisulfite and diethyl malonate.

[0020] By adopting the above water-based blocked curing agent, cross-linking reaction can occur with the resin components in the coating to form a stable three-dimensional network structure, significantly enhancing the mechanical properties and durability of the coating. This curing reaction not only improves the adhesion of the coating, so that it can still be firmly attached to the surface of the cotton knitted fabric during multiple washing and rubbing processes, maintaining the stability of the antibacterial performance, but also enhances the flexibility of the coating, avoiding the problem of cracking or peeling caused by the coating being too hard and brittle.

[0021] Preferably, the thickening agent includes at least one of hydroxyethyl cellulose, hydroxypropyl methyl cellulose and methyl cellulose.

[0022] By adopting the above thickening agent, the viscosity of the coating can be effectively improved, so that the coating is more evenly distributed on the surface of the cotton knitted fabric during application, avoiding the problem of coating flowing or piling up, and ensuring uniform thickness of the coating. At the same time, it can enhance the flexibility of the coating, so that the antibacterial coating better fits the fiber surface without affecting the air permeability and hand feeling of the cotton knitted fabric.

[0023] Preferably, the film-forming agent includes at least one of diethylene glycol butyl ether, diethylene glycol ethyl ether, propylene glycol methyl ether and propylene glycol butyl ether.

[0024] By adopting the above film-forming agent, the film-forming agent has good solubility and volatility, which can gradually volatilize during the drying process of the coating, promoting the close combination of other components in the coating to form a dense protective layer, enhancing the antibacterial performance and durability of the coating. In addition, they can also improve the flexibility and adhesion of the coating, making the coating better fit the surface of the cotton knitted fabric, further improving the antibacterial effect and comfort of the fabric.

[0025] Preferably, the silane coupling agent is composed of 3-ureidopropyl triethoxysilane and gamma-mercaptopropyl trimethoxysilane in a weight ratio of 1:(0.5-3).

[0026] By adopting the above technical solution, the type and amount of the silane coupling agent are optimized, which not only effectively prevents the coating from falling off due to friction or washing during use, but also maintains the softness and air permeability of the cotton knitted fabric. In addition, the introduction of the silane coupling agent also improves the water resistance and weather resistance of the coating, so that the antibacterial coating can maintain stable performance under different environmental conditions, thereby significantly improving the antibacterial durability and comprehensive performance of the cotton knitted fabric.

[0027] Preferably, the surfactant is composed of alkylphenol polyoxyethylene ether and quaternary ammonium salt in a weight ratio of 1:(0.5-1).

[0028] By adopting the above technical solution, the type and amount of the surfactant are optimized, the alkylphenol polyoxyethylene ether has good wetting and dispersing properties, which can reduce the surface tension of the coating, so that the antibacterial coating is more evenly spread on the surface of the cotton knitted fabric, improving the coverage effect of the coating. The quaternary ammonium salt has antibacterial properties, which can further enhance the antibacterial performance of the coating. At the same time, the cationic property of the quaternary ammonium salt can interact with the negative charge on the surface of the cotton fiber, improving the adhesion of the coating. By reasonably matching the two surfactants, the uniformity and antibacterial properties of the coating are ensured, and the stability and durability of the coating are improved, so that the cotton knitted fabric has better antibacterial properties while maintaining good hand feeling and air permeability.

[0029] In a second aspect, the application provides a cotton knitted fabric with an antibacterial coating, which adopts the following technical solution: A cotton knitted fabric with an antibacterial coating is prepared by the following method: S1, adding nano-silver particles, nano-mica powder and active nano-calcium carbonate into water, ultrasonic dispersion to obtain a suspension; S2, stirring the water-based polyurethane resin, the suspension, carboxymethyl chitosan, silicone oil, film forming agent, thickening agent, silane coupling agent and surfactant uniformly, then adding water-based blocked curing agent and stirring uniformly to obtain an antibacterial coating; S3, coating the antibacterial coating on the surface of the cotton knitted fabric, heating to 40-50℃, curing to obtain a cotton knitted fabric with an antibacterial coating.

[0030] By adopting the technical scheme, the formula and preparation process of the antibacterial coating are optimized, the problem that the traditional antibacterial coating affects the hand feeling and air permeability of the cotton knitted fabric is successfully solved, the antibacterial performance and other performances of the fabric are considered at the same time, the cotton knitted fabric with the antibacterial coating can not only effectively inhibit the breeding of bacteria, reduce peculiar smell and mildew phenomenon, but also maintain good comfort and air permeability, and meets the high requirements of the fabric performance in the fields of underwear, T-shirt, sportswear and home textile.

[0031] In summary, the application has the following beneficial effects: 1、The application optimizes the formula and component combination of the antibacterial coating, realizes the significant improvement of the antibacterial performance of the cotton knitted fabric, and achieves a good balance in hand feeling, air permeability and durability. The antibacterial components such as nano silver particles and carboxymethyl chitosan endow the fabric with strong antibacterial ability, and the combination of silicone oil (epoxy modified silicone oil, methacryloyloxy silicone oil and hydroxyl silicone oil) significantly improves the hand feeling, making it soft and smooth and good in air permeability. The synergistic effect of water-based polyurethane resin and nano material maintains the air permeability of the fabric, and the curing agent and silane coupling agent enhance the adhesion and durability of the coating, so that the fabric can maintain stable performance after multiple washing and use. The reasonable use of film forming agent, thickening agent and surfactant further optimizes the uniformity and construction performance of the coating. This comprehensive optimization not only improves the antibacterial effect of the cotton knitted fabric, but also makes it excellent in comfort and durability, widening its application range in the fields of underwear, T-shirt, sportswear and other fields. DETAILED DESCRIPTION EMBODIMENT

[0032] The epoxy modified silicone oil is purchased from Jiaxing Union Chemical Co., Ltd., and the model number is UC-207.

[0033] The methacryloyloxy silicone oil is a methacryloyloxy terminated silicone oil, which is purchased from Dongguan Betley New Material Co., Ltd.

[0034] The hydroxyl silicone oil is purchased from Shandong Lude Rui New Material Co., Ltd., and the product number is 255.

[0035] The carboxymethyl chitosan is purchased from Shanxi Dianfeng Biological Technology Co., Ltd., and the effective substance content is 99%.

[0036] EMBODIMENT 1 A cotton knitted fabric with an antibacterial coating is prepared by the following method: S1, 10g of nano silver particles, 50g of nano mica powder and 50g of active nano calcium carbonate are added to 1000g of water, ultrasonic dispersion is carried out, and a suspension is obtained; The average particle size of the nano mica powder is 100nm, and the average particle size of the active nano calcium carbonate is 50nm; S2, stirring uniformly water-based polyurethane resin 200g, suspension, carboxymethyl chitosan 100g, silicone oil 40g, film forming agent 50g (diethylene glycol butyl ether), thickening agent 10g (hydroxyethyl cellulose), silane coupling agent 10g and surfactant 10g, then add water-based blocked curing agent 10g (caprolactam), stir uniformly, get antibacterial coating; The silicone oil is composed of epoxy-modified silicone oil, methacryloyloxyalkyl silicone oil and hydroxyl silicone oil in a weight ratio of 4:1:2; the silane coupling agent is composed of 3-ureidopropyl triethoxysilane and γ-mercaptopropyl trimethoxysilane in a weight ratio of 1:0.5; the surfactant is composed of alkylphenol polyoxyethylene ether (nonylphenol polyoxyethylene ether) and quaternary ammonium salt (octadecyl trimethyl ammonium chloride) in a weight ratio of 1:0.5; S3, the antibacterial coating is coated on the surface of the cotton knitted fabric, heated to 40℃, and cured to obtain a cotton knitted fabric with an antibacterial coating.

[0037] Example 2-3 differs from Example 1 in that the types, amounts and parameters of raw materials for preparing the cotton knitted fabric with an antibacterial coating are different, and the specific differences are shown in Table 1: Table 1 Types, amounts and parameters of raw materials for preparing the cotton knitted fabric with an antibacterial coating Example 4 A cotton knitted fabric with an antibacterial coating, this embodiment differs from Example 1 in that the silicone oil is composed of epoxy-modified silicone oil, methacryloyloxyalkyl silicone oil and hydroxyl silicone oil in a weight ratio of 1:1:2.

[0038] Example 5 A cotton knitted fabric with an antibacterial coating, this embodiment differs from Example 1 in that the silane coupling agent is 3-ureidopropyl triethoxysilane.

[0039] Example 6 A cotton knitted fabric with an antibacterial coating, this embodiment differs from Example 1 in that the surfactant is alkylphenol polyoxyethylene ether.

[0040] Comparative Example Comparative Example 1 A cotton knitted fabric with an antibacterial coating, this comparative example differs from Example 1 in that the silicone oil is epoxy-modified silicone oil.

[0041] Comparative Example 2 A cotton knitted fabric with an antibacterial coating, the difference between this comparative example and Example 1 is that the silicone oil is composed of epoxy-modified silicone oil and methacryloxyalkyl silicone oil in a weight ratio of 4:1.

[0042] Comparative Example 3 A cotton knitted fabric with an antibacterial coating, the difference between this comparative example and Example 1 is that in step S1, no nano-mica powder is added.

[0043] Comparative Example 4 A cotton knitted fabric with an antibacterial coating, the difference between this comparative example and Example 1 is that in step S1, no active nano-calcium carbonate is added.

[0044] Comparative Example 5 A cotton knitted fabric with an antibacterial coating, the difference between this comparative example and Example 1 is that in step S1, chitosan is used instead of carboxymethylated chitosan.

[0045] Comparative Example 6 A cotton knitted fabric with an antibacterial coating, the difference between this comparative example and Example 1 is that in step S1, no silane coupling agent is added.

[0046] Comparative Example 7 A cotton knitted fabric with an antibacterial coating, the difference between this comparative example and Example 1 is that in step S1, no surfactant is added.

[0047] Detection method / test method Antimicrobial test: The shaking method GB / T 20944.3 is used to calculate the inhibition rate by comparing the number of E. coli colonies cultured in agar medium for 16h.

[0048] Air permeability test: The test is carried out in accordance with GB / T 5453-1997 Determination of air permeability of textile fabrics.

[0049] Hand feeling test: 20 quality inspectors evaluate each group of fabric by touching, pinching, rubbing, grabbing, shaking, pulling, etc. The fabric is scored mainly from smoothness and softness and skin-friendliness, and then the average score is taken from 0-10, the higher the score, the better the hand feeling.

[0050] Washing resistance test: The cotton knitted fabrics with antibacterial coating prepared in Examples 1-6 and Comparative Examples 1-7 are placed in a washing machine at a speed of 800r / min, stirred for 1min, dried (for one time), stirred for 50 times, and then subjected to antimicrobial test and hand feeling test. The experimental data are shown in Table 2: Table 2 Experimental data of Examples 1-6 and Comparative Examples 1-7 The technical scheme successfully solves the problem of the traditional antibacterial coating affecting the hand feeling and air permeability of the cotton knitted fabric, realizes a good balance between the antibacterial performance and the hand feeling comfort and air permeability, and can maintain good hand feeling and air permeability after multiple washing.

[0051] It can be known from the experimental data of example 1 and comparative examples 1-7 that the best performance is achieved in terms of antibacterial performance, hand feeling, air permeability and durability, and the comprehensive performance of comparative examples 1-7 is poor in terms of antibacterial performance, hand feeling, air permeability and durability, which indicates that the addition of nano mica powder and active nano calcium carbonate has an important influence on the antibacterial performance, hand feeling and air permeability of the coating, and the two fill the small pores of the coating, making the coating more delicate and uniform, and at the same time providing the required small channels for air permeability; the synergistic effect of epoxy modified silicone oil, methacryloxyalkyl silicone oil and hydroxyl silicone oil significantly improves the hand feeling and air permeability. When a single silicone oil or a certain silicone oil is missing, the hand feeling and air permeability will decrease; the silane coupling agent and the surfactant have an important influence on the antibacterial performance and hand feeling of the coating.

[0052] It can be known from the experimental data of example 1 and examples 4-6 that the formula of example 1 realizes the best balance between the antibacterial performance, hand feeling and air permeability by optimizing the proportion of silicone oil, the use of composite silane coupling agent and composite surfactant.

[0053] The specific embodiment is only an explanation of the application, and is not a limitation of the application, and those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the application, they are protected by the patent law.

Claims

1. A cotton knit fabric with an antibacterial coating, comprising a cotton knit fabric and an antibacterial coating, characterized in that, The antibacterial coating is prepared from the following raw materials by weight: Waterborne polyurethane resin 20-40 parts Nano-silver particles 1-5 parts Nano-mica powder 5-15 parts Active nano-calcium carbonate 5-15 parts Carboxymethylated chitosan 10-20 parts Silicone oil 4-6 parts Film-forming agent 5-15 parts Thickening agent 1-5 parts Silane coupling agent 1-5 parts Surfactant 1-5 parts Waterborne blocked curing agent 1-3 parts Water 100-200 parts. The silicone oil is composed of epoxy-modified silicone oil, methacryloyloxyalkyl silicone oil and hydroxyl silicone oil.

2. A cotton knit fabric with an antimicrobial coating according to claim 1, characterized in that: The weight ratio of the epoxy-modified silicone oil, the methacryloyloxyalkyl silicone oil and the hydroxyl silicone oil is (4-5):1:(2-5).

3. A cotton knit fabric with an antimicrobial coating according to claim 1, characterized in that: The average particle size of the nano-mica powder is 100-200 nm, and the average particle size of the active nano-calcium carbonate is 50-100 nm.

4. A cotton knit fabric with an antimicrobial coating according to claim 1, characterized in that: The waterborne polyurethane resin is Impranil DLP-R from Covestro or waterborne polyurethane resin ML-2060 from Shanghai Qizhan New Material Technology Co., Ltd.

5. A cotton knit fabric with an antimicrobial coating according to claim 1, wherein: The waterborne blocked curing agent includes at least one of caprolactam, imidazole, sodium bisulfite and diethyl malonate.

6. A cotton knit fabric with an antimicrobial coating according to claim 1, wherein: The thickening agent includes at least one of hydroxyethyl cellulose, hydroxypropyl methyl cellulose and methyl cellulose.

7. A cotton knit fabric with an antimicrobial coating according to claim 1, wherein: The film-forming agent includes at least one of diethylene glycol butyl ether, diethylene glycol ethyl ether, propylene glycol methyl ether and propylene glycol butyl ether.

8. A cotton knit fabric with an antimicrobial coating according to claim 1, characterized in that: The silane coupling agent is composed of 3-ureidopropyl triethoxysilane and γ-mercaptopropyl trimethoxysilane in a weight ratio of 1:(0.5-3).

9. A cotton knit fabric with an antimicrobial coating according to claim 1, wherein: The surfactant is composed of alkyl phenol polyoxyethylene ether and quaternary ammonium salt in a weight ratio of 1:(0.5-1).

10. A cotton knit fabric with an antimicrobial coating, characterized in that, Prepared by the following method: S1, add nano-silver particles, nano-mica powder and active nano-calcium carbonate into water, ultrasonic dispersion to obtain a suspension; S2, stir the waterborne polyurethane resin, the suspension, carboxymethylated chitosan, silicone oil, film-forming agent, thickening agent, silane coupling agent and surfactant uniformly, then add the waterborne blocked curing agent and stir uniformly to obtain the antibacterial coating; S3, coat the antibacterial coating on the surface of the cotton knitted fabric, heat to 40-50℃, cure to obtain the cotton knitted fabric with antibacterial coating.

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