Antibacterial finishing agent, preparation method of dry and comfortable antibacterial pure cotton non-woven fabric and disposable hygienic product

Abstract

The invention discloses a bacteriostatic finishing agent, a preparation method of dry and comfortable bacteriostatic pure cotton non-woven fabric and a disposable hygienic product. Emulsifying and mixing the prepared antibacterial finishing agent and the water-repellent finishing agent by adding a surfactant; the antibacterial finishing agent is dispersed in the water phase, the water-repellent finishing agent is dispersed in the oil phase, and the pure cotton non-woven fabric is subjected to after-finishing; free active sites react with hydroxyl groups on pure cotton non-woven fibers to occupy hydroxyl active sites in the region, and meanwhile, due to the steric hindrance effect with chitosan and polylysine polymer chains, the situation that the hydrophilic performance is reduced due to spreading of a water-repellent finishing agent in the region is prevented. The antibacterial finishing agent is safe in raw materials, efficient to use, free of irritation and sensitization and stable in antibacterial effect, the antibacterial finishing agent and the water-repellent finishing agent are emulsified and mixed by adding the surfactant, and the steric hindrance effect is constructed; the water-repellent finishing agent is prevented from spreading in the area, and a special after-finishing process is adopted for after-finishing, so that the dryness of the non-woven fabric is improved.

Description

Technical Field

[0001] The invention relates to an antibacterial finishing agent, a preparation method of a dry antibacterial pure cotton nonwoven fabric and disposable sanitary products. Background Art

[0002] In recent years, the demand for disposable sanitary products such as sanitary napkins and diapers in the Chinese market has continued to grow. During the use of sanitary products, because they are not changed for a long time and are worn in a closed manner, the use area is in high humidity and stuffiness, which can easily cause problems such as microbial growth, odor, and inflammation. The surface cotton non-woven fabric of sanitary products directly contacts human skin during the use of the product, so the development, design and functional research of the surface material have also received widespread attention, and consumers mainly focus on the product's hygiene performance, safety and comfort when purchasing functional products.

[0003] The main antibacterial treatment of non-woven materials on the market currently achieves a broad-spectrum antibacterial effect through chemical antibacterial or its compound form, but it is easy to irritate the skin during use, and at the same time destroy the normal microbial balance, and cannot achieve a good antibacterial effect. At the same time, in order to solve the problems of stuffiness and humidity, the pure cotton non-woven fabric is usually semi-water-repellent treated and dried as a whole to reduce the overall water repellency, and then the water-repellent finishing agent is roller-coated / sprayed on one side, and by controlling the amount of oil added, part of the base material is exposed to achieve a balance between dryness and hydrophilicity. However, during the aging process, the water-repellent oil will further spread on the fiber surface, breaking the balance between dryness and hydrophilicity, resulting in the inability of liquid to penetrate, affecting the dryness performance and affecting the comfort of consumers. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the purpose of the present invention is to provide an antibacterial finishing agent, a method for preparing a dry antibacterial pure cotton nonwoven fabric and a disposable sanitary product.

[0005] To achieve the above purpose, the preparation method of the antibacterial finishing agent of the present invention comprises the following raw material components in parts by weight: 1-10 parts of polylysine, 0.5-10 parts of lauroyl arginine ethyl ester hydrochloride, 0.5-40 parts of chitosan, 0.5-5 parts of cyanuric chloride, and 200-300 parts of deionized water.

[0006] Further, 0.5-40 parts of chitosan are dissolved in deionized water, and 0.5-5 parts of cyanuric chloride are added under stirring and stirred at 40-50° C. for 0.5-3 hours to fully mix the mixture so as to bond the chitosan through the active groups of cyanuric chloride;

[0007] 1-10 parts of polylysine and 0.5-10 parts of lauroyl arginine ethyl ester hydrochloride are added and stirred continuously, and the hydroxyl and amino groups of chitosan and polylysine and lauroyl arginine ethyl ester hydrochloride are bonded by the active group of cyanuric chloride to obtain a polymer with antibacterial activity through a one-pot organic synthesis.

[0008] In order to achieve the above object, the method for preparing the dry and antibacterial pure cotton nonwoven fabric of the present invention comprises the following steps:

[0009] preparing the above-mentioned antibacterial finishing agent;

[0010] The prepared antibacterial finishing agent and the water-repellent finishing agent are emulsified and mixed by adding a surfactant; so that the antibacterial finishing agent is dispersed in the water phase, the water-repellent finishing agent is dispersed in the oil phase, and then finished on the pure cotton non-woven fabric; the free active sites react with the hydroxyl groups on the pure cotton non-woven fibers, occupying the hydroxyl active sites in the area, and at the same time, the steric hindrance effect of the chitosan and polylysine polymer chains prevents the water-repellent finishing agent from spreading in the area, resulting in a decrease in the hydrophilic performance.

[0011] Furthermore, the surfactant is one or more of a cationic surfactant or a nonionic surfactant.

[0012] Furthermore, the water-repellent finishing agent is one or more of polyethylene wax, fatty acid amide, fatty acid, and polyol compound.

[0013] Furthermore, the emulsified antibacterial dry finishing agent is used to treat the pure cotton nonwoven fabric in a one-step finishing process.

[0014] Furthermore, the finishing agent is atomized on the pure cotton nonwoven fabric through an atomizing device.

[0015] Furthermore, the steps also include: real-time monitoring of the moisture distribution in the depth direction of the pure cotton nonwoven fabric after atomization;

[0016] Analyze coating droplet size using computer vision technology;

[0017] Using the long short-term memory network (LSTM), the water repellency strength is predicted based on historical data, the turntable addition parameters are generated in real time, and the rotary atomizer pressure and particle size are accurately adjusted through the servo motor.

[0018] To achieve the above object, the disposable sanitary product of the present invention uses the dry and antibacterial pure cotton nonwoven fabric prepared by the above-mentioned method for preparing the dry and antibacterial pure cotton nonwoven fabric.

[0019] The present invention discloses an antibacterial finishing agent with safe raw materials, high efficiency, no irritation, no sensitization and stable antibacterial effect. The present invention emulsifies and mixes the antibacterial finishing agent and the water-repellent finishing agent by adding a surfactant to construct a steric hindrance effect, thereby preventing the water-repellent finishing agent from spreading in the area and adopting a special post-finishing process for post-finishing to improve the dryness of the non-woven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the active group of cyanuric chloride bonding to the hydroxyl and amino groups of chitosan, polylysine and lauroyl arginine ethyl ester hydrochloride. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] Example 1

[0023] The preparation method of the antibacterial finishing agent of the present invention:

[0024] 0.5-40 parts of low molecular weight chitosan are dissolved in 200-300 parts of deionized water, and 0.5-5 parts of cyanuric chloride are added under stirring and stirred at 40-50° C. for 0.5-3h to fully mix, and the chitosan is bonded through the active group of cyanuric chloride; then 1-10 parts of polylysine and 0.5-10 parts of lauroyl arginine ethyl ester hydrochloride are added and continued to stir, and the active group of cyanuric chloride is used to bond the chitosan and the hydroxyl, amino and other groups of polylysine and lauroyl arginine ethyl ester hydrochloride, and a polymer with antibacterial activity is organically synthesized through a one-pot method.

[0025] The above-mentioned polylysine is a high molecular material with good antibacterial effect on bacteria; lauroyl arginine ethyl ester hydrochloride is a low molecular material with good antibacterial effect on fungi, and the two have a synergistic effect and have the characteristics of broad-spectrum antibacterial. Both are amino acid antibacterial materials with high safety performance and no cytotoxicity.

[0026] The above-mentioned finishing agent is used to post-finish the pure cotton non-woven fabric. The free active sites in the finishing agent can be further bonded with the hydroxyl groups of the fiber and fixed on its surface. At the same time, chitosan and polylysine themselves have film-forming properties, and a stable antibacterial coating is constructed on the fiber surface, so that both polylysine and lauroyl arginine ethyl ester hydrochloride are fixed on the fiber surface without the risk of dissolution. While achieving a stable antibacterial effect, it will not affect the normal vaginal flora.

[0027] The present invention adds a surfactant to emulsify and mix the antibacterial finishing agent and the water-repellent finishing agent, disperses the antibacterial finishing agent in the water phase, disperses the water-repellent finishing agent in the oil phase, and then finishes the nonwoven fabric on the pure cotton. The free active sites react with the fiber hydroxyl groups, occupying the hydroxyl active sites in the region, and at the same time, the steric hindrance effect of the chitosan and polylysine polymer chains prevents the water-repellent finishing agent from spreading in the region, resulting in reduced hydrophilic properties.

[0028] The above-mentioned surfactants: one or more of cationic surfactants or nonionic surfactants.

[0029] The above-mentioned water-repellent finishing agent: one or more of polyethylene wax, fatty acid amide, fatty acid, and polyol compound.

[0030] The emulsified antibacterial dry finishing agent is used to treat the pure cotton nonwoven fabric in a one-step finishing process to construct a hydrophilic / water-repellent potential energy gradient, and the gradient change in the entire depth direction is controlled to keep the hydrophilic / water-repellent potential energy in the depth direction of different positions of the pure cotton nonwoven fabric consistent, so as to ensure that the liquid can penetrate smoothly and achieve a dry occult blood effect.

[0031] Example 2

[0032] The finishing process is as follows:

[0033] The finishing agent is added through a turntable device (such as the turntable device produced by WEKO). The turntable rotates at high speed to spray out extremely fine atomized material, controlling the pressure (affecting the penetration depth) and particle size (large particle size: hydrophilic / water-repellent difference; small particle size: small hydrophilic / water-repellent difference) of the rotating atomized material. The front small particle size (0.5-30um) has a high pressure (to ensure penetration depth), and the back large particle size (2-100um) has a low pressure (surface) to regulate the distribution ratio in the depth direction.

[0034] The computer vision technology described above is used to analyze the coating droplet size;

[0035] 1) Use a camera or infrared scanner to photograph the surface of the nonwoven fabric to obtain an image of the coating droplets;

[0036] 2) Preprocessing the images to accurately identify and measure droplet size;

[0037] 3) extracting characteristic information of the droplet from the processed image;

[0038] The image preprocessing includes:

[0039] 1) Grayscale processing of images to reduce image interference;

[0040] 2) extracting a scatter plot of the grayscale histogram and fitting the scatter plot using a Gaussian fitting function;

[0041] 3) Use median filtering to reduce the noise of the image;

[0042] 4) Identify the processed graph and determine the droplet diameter based on the midpoint of the graph.

[0043] Using the long short-term memory network (LSTM), the water repellency strength is predicted based on historical data, the turntable addition parameters are generated in real time, and the pressure and particle size of the rotating atomizer are precisely adjusted through the servo motor; specifically:

[0044] Determine the effect of water repellent parameters, environmental conditions, application surface characteristics, and turntable speed on water repellency; the water repellent parameters include at least composition, concentration, and droplet diameter;

[0045] determining an initial training data set based on the influence;

[0046] Preprocessing the initial training data set to obtain a model training data set, wherein the model training data set includes a training data set and a test data set;

[0047] Build an initial prediction model based on the long short-term memory network LSTM;

[0048] The initial prediction model is trained and verified using the above training data set and test data set;

[0049] The verified prediction model is used to generate the turntable addition parameters in advance, so that the pressure and particle size of the rotary atomizer can be accurately adjusted by the servo motor. Closed-loop control is achieved to ensure the consistency of the hydrophilic / water-repellent potential energy in the depth direction of the pure cotton nonwoven at different positions.

[0050] Experimental data

[0051] Antibacterial agents of different systems were post-treated on pure cotton non-woven fabrics, and the antibacterial properties were tested according to "GB 15979-2002 Hygienic Standard for Disposable Sanitary Products", the antibacterial rings were tested according to "GB / T 42702-2023 Determination of Antibacterial Properties of Paper, Paperboard and Paper Products", and the safety was characterized according to "GB / T 16886.5-2017 Biological Evaluation of Medical Devices Part 5: In Vitro Cytotoxicity Test".

[0052]

[0053]

[0054] Polylysine is a polymer material with good antibacterial effect on bacteria; lauroyl arginine ethyl ester hydrochloride is a low molecular material with good antibacterial effect on fungi. The two have a synergistic effect and have a broad-spectrum antibacterial effect. At the same time, the active cyanuric chloride multi-site system is used to fix polylysine and lauroyl arginine ethyl ester hydrochloride on the fiber surface to achieve non-dissolution antibacterial effect. While achieving a stable antibacterial effect, it will not affect the normal flora of the vagina. Compared with conventional antibacterial systems such as benzalkonium chloride, which have cytotoxicity and may cause skin irritation when in contact with the skin, the polylysine and lauroyl arginine ethyl ester hydrochloride of the present invention are both amino acid antibacterial materials with high safety performance. Even in the case of extreme extraction, there will be no cytotoxicity.

[0055] Different water-repellent finishing schemes were used to treat pure cotton nonwovens for water-repellent finishing. According to GB / T 24218.11-2012 Test methods for textile nonwovens Part 11: Determination of runoff amount and GB / T 24218.14-2010 Test methods for textile nonwovens Part 14: Determination of rewetting amount of coated materials, their hydrophilic and dry effects were characterized.

[0056] The effect of different water-repellent finishing schemes on rewetting and overflow was studied by using the impregnation finishing method.

[0057]

[0058] Explanation of the phenomenon:

[0059] 1. Without water-repellent finishing, pure cotton nonwovens have a large amount of hydroxyl groups, so the rewetting amount is large and there is no risk of liquid overflow. During the aging process, the fibers will not be damaged, so there will be no effect on the rewetting amount and overflow amount.

[0060] 2. After strong finishing with water-repellent oil, due to the attachment of a certain amount of water-repellent oil on the fiber, the absorption capacity of the cotton fiber is weakened and the amount of rewetting is significantly reduced. However, during the aging process, the water-repellent oil spreads on the fiber surface, resulting in a significant increase in overflow and a risk of leakage.

[0061] 3. Although the overflow risk during the aging process is reduced after weak water-repellent oil finishing, there is still a large amount of rewetting, and the real dryness purpose is not achieved.

[0062] 4. In the scheme of the present invention, due to the space-occupying effect, the water-repellent oil agent will not further spread on the fiber surface during aging, so the relationship between the rewetting amount and the overflow amount can be extremely balanced.

[0063] Effects of antibacterial dry finishing agent and different finishing methods on rewetting and overflow

[0064]

[0065] Explanation of the phenomenon:

[0066] 1. Impregnation: It is difficult to achieve a hydrophilic potential energy gradient, which is not conducive to liquid infiltration. In order to achieve liquid infiltration, the water-repellent finishing strength needs to be reduced, resulting in a higher rewetting amount.

[0067] 2. Roller coating: Roller coating relies on swimming migration to achieve the difference in hydrophilic potential energy gradient between the front and back sides to ensure the liquid infiltration rate, but it cannot control the controllable differences at different depths.

[0068] 3. Rotating disc spraying: Combining the effect of pressure on penetration depth and the effect of particle size on hydrophilicity / water repellency, the difference in hydrophilicity at different depths and hydrophilic areas can be achieved, resulting in low rewetting and overflow.

[0069] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0070] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing an antibacterial finishing agent, characterized in that: The antibacterial finishing agent comprises the following raw material components in parts by weight: 1-10 parts of polylysine, 0.5-10 parts of lauroyl arginine ethyl ester hydrochloride, 0.5-40 parts of chitosan, 0.5-5 parts of cyanuric chloride, and 200-300 parts of deionized water.

2. The method for preparing an antibacterial finishing agent according to claim 1, characterized in that: Dissolve 0.5-40 parts of chitosan in deionized water, add 0.5-5 parts of cyanuric chloride under stirring and stir at 40-50° C. for 0.5-3 hours to mix thoroughly, so that the chitosan is bonded through the active groups of cyanuric chloride; 1-10 parts of polylysine and 0.5-10 parts of lauroyl arginine ethyl ester hydrochloride are added and stirred continuously, and the hydroxyl and amino groups of chitosan and polylysine and lauroyl arginine ethyl ester hydrochloride are bonded by the active group of cyanuric chloride to obtain a polymer with antibacterial activity through a one-pot organic synthesis.

3. A method for preparing a dry and antibacterial pure cotton nonwoven fabric, characterized in that: The method comprises the following steps: Prepare the antibacterial finishing agent as claimed in claim 1; The prepared antibacterial finishing agent and the water-repellent finishing agent are emulsified and mixed by adding a surfactant; so that the antibacterial finishing agent is dispersed in the water phase, the water-repellent finishing agent is dispersed in the oil phase, and then finished on the pure cotton non-woven fabric; the free active sites react with the hydroxyl groups on the pure cotton non-woven fibers, occupying the hydroxyl active sites in the area, and at the same time, the steric hindrance effect of the chitosan and polylysine polymer chains prevents the water-repellent finishing agent from spreading in the area, resulting in a decrease in the hydrophilic performance.

4. The method for preparing the dry antibacterial pure cotton nonwoven fabric according to claim 3, characterized in that: The surfactant is one or more of a cationic surfactant or a nonionic surfactant; The water-repellent finishing agent is one or more of polyethylene wax, fatty acid amide, fatty acid and polyol compound.

5. The method for preparing the dry antibacterial pure cotton nonwoven fabric according to claim 3, characterized in that: The emulsified antibacterial dry finishing agent is used to treat the pure cotton nonwoven fabric in a one-step finishing process; or, the finishing agent is atomized on the pure cotton nonwoven fabric through an atomizing device.

6. The method for preparing the dry antibacterial pure cotton nonwoven fabric according to claim 5, characterized in that: Real-time monitoring of the moisture distribution in the depth direction of the pure cotton nonwoven fabric after atomization; Analyze coating droplet size using computer vision technology; Using the long short-term memory network (LSTM), the water repellency strength is predicted based on historical data, the turntable addition parameters are generated in real time, and the rotary atomizer pressure and particle size are accurately adjusted through the servo motor.

7. The method for preparing the dry antibacterial pure cotton nonwoven fabric according to claim 6, characterized in that: The step of analyzing the coating droplet size using computer vision technology is as follows: 1) Using a camera to photograph the surface of the nonwoven fabric to obtain an image of the coating droplets; 2) Preprocessing the images to accurately identify and measure droplet size; 3) Extract the characteristic information of the droplets from the processed image.

8. The method for preparing the dry antibacterial pure cotton nonwoven fabric according to claim 6, characterized in that: The image preprocessing includes: 1) Grayscale processing of images to reduce image interference; 2) extracting a scatter plot of the grayscale histogram and fitting the scatter plot using a Gaussian fitting function; 3) Use median filtering to reduce the noise of the image; 4) Identify the processed graph and determine the droplet diameter based on the midpoint of the graph.

9. The method for preparing the dry antibacterial pure cotton nonwoven fabric according to claim 6, characterized in that: The steps of using a long short-term memory network (LSTM) to predict water repellency based on historical data, generating turntable addition parameters in real time, and accurately adjusting the pressure and particle size of the rotary atomizer through a servo motor are specifically as follows: Determine the effect of water repellent parameters, environmental conditions, application surface characteristics, and turntable speed on water repellency; the water repellent parameters include at least composition, concentration, and droplet diameter; determining an initial training data set based on the influence; Preprocessing the initial training data set to obtain a model training data set, wherein the model training data set includes a training data set and a test data set; Build an initial prediction model based on the long short-term memory network LSTM; The initial prediction model is trained and verified using the above training data set and test data set; The validated prediction model is used to precisely adjust the pressure and particle size of the rotary atomizer via a servo motor.

10. A disposable sanitary product, characterized in that: The disposable sanitary products use the dry and antibacterial pure cotton nonwoven fabric prepared by the preparation method of the dry and antibacterial pure cotton nonwoven fabric as claimed in claim 3.

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