A method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties

Abstract

The invention discloses a method for preparing a hemp fabric with high antibacterial, water-repellent and breathable properties, comprising the following steps: (1) adding tannic acid at a mass ratio of mesoporous silica nanoparticles to tannic acid of 1:(0.5-2), stirring in the dark for 12 hours, and forming antibacterial nanoparticles by complexation; (2) subjecting the hemp fabric to plasma pretreatment at a frequency of 5-10 MHz, a helium flow rate of 30-50 L / min, a discharge voltage of 3-10 kV, and a discharge time of 50-120 s; (3) uniformly dispersing the antibacterial nanoparticles in an aminosilicone oil emulsion to form a coating liquid; (4) immersing the hemp fabric in the coating liquid, stirring, and uniformly coating the coating liquid on the surface of the hemp fabric; (5) drying at 120° C. after the immersion is completed. Under the combined action of the antibacterial nanoparticles and the plasma treatment, the air permeability and water repellency of the fabric are greatly improved. The prepared fabric can simultaneously have the dual properties of water repellency and breathability while improving the original high-efficiency antibacterial function.

Description

Technical Field

[0001] The present invention relates to the technical field of functional textile production, and in particular to a method for preparing a hemp fabric with high antibacterial, water-repellent and breathable properties. Background Art

[0002] With socioeconomic development and improved living standards, people's expectations for textile fabrics are increasing. Hemp fabrics, which contain antimicrobial ingredients and possess certain antibacterial and mildew-resistant properties, as well as excellent moisture absorption and breathability, have gradually gained popularity. However, during the fiber processing and weaving process, most of the antimicrobial ingredients in hemp fabrics are lost, significantly reducing their antimicrobial properties and making it difficult to meet people's antimicrobial needs. The development of highly effective antimicrobial specialty hemp fabrics is of great significance.

[0003] CN 114960193 A discloses a method for processing a natural antibacterial hemp UV-proof cooling fabric, comprising the following steps:

[0004] (1) After the nano boron nitride is subjected to a steam oxidation process, it is washed and dried to prepare hydroxylated nano boron nitride; (2) the hydroxylated nano boron nitride is mixed with nano ZnO, Tween 80 dispersant, and titanate coupling agent in water, stirred, and then further dispersed by ultrasound to obtain a composite finishing liquid; (3) the hemp fabric to be processed is immersed in the composite finishing liquid and treated by a padding and drying process to obtain a natural antibacterial hemp anti-ultraviolet cooling fabric.

[0005] CN 106436324A discloses an antistatic, anti-ultraviolet, antibacterial, air-permeable, skin-feeling, water-based polyurethane coating adhesive for textiles and a preparation method thereof. The raw materials are prepared by weight from 20-30 parts of deionized water, 0.5-3.0 parts of diisopropyl octadecyloxy acetyl aluminum chelate, 5.0-15 parts of modified hemp wood cellulose powder, 3.0-5.0 parts of polyurethane elastic powder, 50-70 parts of polyurethane adhesive, 0.1-0.3 parts of defoaming agent, 1.0-5.0 parts of associative polyurethane thickener, 2.0-5.0 parts of antistatic agent, 5.0-10 parts of silicone smooth feel agent, 2.0-5.0 parts of silicone anti-sticking agent, and 1.0-3.0 parts of ultraviolet absorber.

[0006] As can be seen from the aforementioned patented technology, current methods for modifying hemp fabrics to provide breathability alongside their antibacterial properties typically employ finishing solutions. However, while achieving breathability, these solutions also damage the antibacterial properties inherent in the hemp fiber, significantly reducing its antibacterial properties. This does not meet the basic requirements of functional fabrics. Furthermore, current methods for modifying hemp fabrics to provide water repellency have not been reported in existing technologies.

[0007] To sum up, how to improve the problem of loss of most antibacterial components in the current hemp fabrics during fiber processing and weaving, and effectively improve the breathability and water repellency, has become a difficult problem that technicians in the hemp fabric field urgently need to solve. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, which effectively improves the problem of most of the antibacterial costs being lost during the processing of hemp fabrics, improves the antibacterial properties, and has both breathable and water-repellent properties.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, comprising the following steps:

[0010] 1. Preparation of antibacterial nanoparticles:

[0011] (1) Add tannic acid at a mass ratio of mesoporous silica nanoparticles to tannic acid of 1:(0.5-2), stir in the dark for 12 h, and form antibacterial nanoparticles by complexation;

[0012] 2. Plasma pretreatment of hemp fabric:

[0013] (2) Pre-treating the linen fabric with plasma at a frequency of 5-10 MHz, a helium flow rate of 30-50 L / min, a discharge voltage of 3-10 kV, and a discharge time of 50-120 s;

[0014] 3. Impregnation treatment:

[0015] (3) 5-20 g of the antibacterial nanoparticles prepared in step (1) are uniformly dispersed in the aminosilicone oil emulsion to form a coating liquid consisting of mesoporous silica nanoparticles, aminosilicone oil emulsion, and tannic acid mixed solution;

[0016] (4) Immerse 100 g of plasma-pretreated hemp fabric in the coating solution and stir it at a stirring speed of 200-600 r / min for 10 min, and evenly apply the coating solution on the surface of the hemp fabric;

[0017] (5) After the impregnation is completed, the hemp fabric is taken out and dried at 120°C to obtain a hemp fabric with high antibacterial, water-repellent and breathable properties with a coating on the surface.

[0018] The method for preparing the above-mentioned hemp fabric with high antibacterial, water-repellent and breathable properties, wherein the mass ratio of the mesoporous silica nanoparticles to the tannic acid in step (1) is 1:1,

[0019] In the above-mentioned method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, the particle size of the mesoporous silica nanoparticles in step (1) is 50-100 nm, and the pore size is 5-20 nm.

[0020] In the above-mentioned method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, in step (2), the plasma is oxygen or air plasma, the frequency is 8 MHz, the helium flow rate is 40 L / min, the discharge voltage is 5 kV, and the discharge time is 50 s.

[0021] In the above-mentioned method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, in step (3), the treatment conditions are a stirring speed of 500 r / min, a stirring time of 10 min, and drying at 120° C. after the impregnation is completed.

[0022] In the above-mentioned method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, a coating is uniformly formed on the surface of the hemp fabric, the coating thickness is 0.1-0.5 mm, and the solid content of mesoporous silica nanoparticles in the hemp fabric is 5%-20%.

[0023] The advantages of the method for preparing a hemp fabric with high antibacterial, water-repellent and breathable properties disclosed herein are as follows: mesoporous silica and tannic acid are compounded into nanoparticles and adsorbed onto the surface of plasma-treated hemp fabric. The mesoporous silica nanoparticles, with their specific surface area, easily modifiable surface properties, and efficient drug loading and release properties, are combined with tannic acid to form a coating on the hemp fabric surface, thereby enhancing the water resistance, tear strength, and resilience of the hemp fabric. This method assists in improving the sterilization and disinfection effect, prolongs the antibacterial time of the hemp fabric, and improves the antibacterial durability of the hemp fabric. The coating is treated after the plasma treatment, thereby improving the fastness of the coating. Simultaneously, the antibacterial nanoparticles combined with the plasma treatment significantly improve the breathability and water-repellent properties of the fabric. This allows the prepared fabric to not only improve its original high-efficiency antibacterial function but also simultaneously possess the dual properties of being water-repellent and breathable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an electron microscope photo of hemp fiber in hemp fabric with high antibacterial, water-repellent and breathable properties;

[0025] Figure 2 These are comparative photos of the antibacterial properties of the hemp fabric of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1:

[0028] A method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, comprising the following steps:

[0029] 1. Preparation of antibacterial nanoparticles:

[0030] (1) Tannic acid was added at a mass ratio of mesoporous silica nanoparticles to tannic acid of 1:0.5, and stirred in the dark for 12 hours to form antibacterial nanoparticles by complexation; the particle size of the mesoporous silica nanoparticles was 50 nm and the pore size was 5 nm.

[0031] 2. Plasma pretreatment of hemp fabric:

[0032] (2) The linen fabric is subjected to plasma pretreatment with a frequency of 5 MHz, a helium flow rate of 30 L / min, a discharge voltage of 3 kV, and a discharge time of 100 s; the plasma is oxygen or air plasma.

[0033] 3. Impregnation treatment:

[0034] (3) 5 g of the antibacterial nanoparticles prepared in step (1) are uniformly dispersed in the aminosilicone oil emulsion to form a coating liquid consisting of mesoporous silica nanoparticles, aminosilicone oil emulsion, and tannic acid mixed solution;

[0035] (4) Immerse 100 g of plasma-pretreated hemp fabric in the coating solution and stir it. The stirring speed is set to 200 r / min and the stirring time is 10 min. The coating solution is evenly applied on the surface of the hemp fabric.

[0036] (5) After the impregnation is completed, the hemp fabric is taken out and dried at 120°C to obtain a hemp fabric with high antibacterial, water-repellent and breathable properties with a coating on the surface.

[0037] Example 2:

[0038] A method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, comprising the following steps:

[0039] 1. Preparation of antibacterial nanoparticles:

[0040] (1) Tannic acid was added at a mass ratio of 1:1 between mesoporous silica nanoparticles and tannic acid, and the mixture was stirred in the dark for 12 h to form antibacterial nanoparticles. The particle size of the mesoporous silica nanoparticles was 75 nm and the pore size was 10 nm.

[0041] 2. Plasma pretreatment of hemp fabric:

[0042] (2) The linen fabric is subjected to plasma pretreatment at a frequency of 8 MHz, a helium flow rate of 40 L / min, a discharge voltage of 5 kV, and a discharge time of 120 s; the plasma is oxygen or air plasma.

[0043] 3. Impregnation treatment:

[0044] (3) taking 10 g of the antibacterial nanoparticles prepared in step (1) and uniformly dispersing them in the aminosilicone oil emulsion to form a coating liquid consisting of mesoporous silica nanoparticles, aminosilicone oil emulsion, and tannic acid mixed solution;

[0045] (4) Immerse 100 g of plasma-pretreated hemp fabric in the coating solution and stir it. The stirring speed is set to 600 r / min and the stirring time is 10 min. The coating solution is evenly applied on the surface of the hemp fabric.

[0046] (5) After the impregnation is completed, the hemp fabric is taken out and dried at 120°C to obtain a hemp fabric with high antibacterial, water-repellent and breathable properties with a coating on the surface.

[0047] Example 3:

[0048] A method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, comprising the following steps:

[0049] 1. Preparation of antibacterial nanoparticles:

[0050] (1) Tannic acid was added at a mass ratio of mesoporous silica nanoparticles to tannic acid of 1:2, and the mixture was stirred in the dark for 12 hours to form antibacterial nanoparticles. The particle size of the mesoporous silica nanoparticles was 100 nm and the pore size was 20 nm.

[0051] 2. Plasma pretreatment of hemp fabric:

[0052] (2) The linen fabric is subjected to plasma pretreatment at a frequency of 10 MHz, a helium flow rate of 50 L / min, a discharge voltage of 10 kV, and a discharge time of 50 s; the plasma is oxygen or air plasma.

[0053] 3. Impregnation treatment:

[0054] (3) taking 20 g of the antibacterial nanoparticles prepared in step (1) and uniformly dispersing them in the aminosilicone oil emulsion to form a coating liquid consisting of mesoporous silica nanoparticles, aminosilicone oil emulsion, and tannic acid mixed solution;

[0055] (4) Immerse 100 g of plasma-pretreated hemp fabric in the coating solution and stir it. The stirring speed is set to 500 r / min and the stirring time is 10 min. The coating solution is evenly applied on the surface of the hemp fabric.

[0056] (5) After the impregnation is completed, the hemp fabric is taken out and dried at 120°C to obtain a hemp fabric with high antibacterial, water-repellent and breathable properties with a coating on the surface.

[0057] After the hemp fabric with high antibacterial, water-repellent and breathable properties of the present invention is treated with plasma, a coating composed of mesoporous silica nanoparticles, aminosilicone emulsion and tannic acid mixed solution is evenly formed on the surface of the hemp fabric. The coating thickness is 0.1-0.5 mm, and the solid content of the mesoporous silica nanoparticles in the hemp fabric is 5%-20%.

[0058] Depend on Figure 1 The surface fiber morphology shows that after plasma treatment and dip coating, the surface roughness of the hemp fiber increases, and a clear coating structure can be seen. In addition, the contact angle is greater than 90°, and the hydrophobicity of the fabric surface is greatly improved.

[0059] Depend on Figure 2 It can be seen that by comparing the hemp fabric of the present invention with the untreated hemp fabric, it can be clearly seen that the hemp fabric treated by the present invention has good antibacterial properties, with an inhibition rate against Escherichia coli greater than 80% and an inhibition rate against Staphylococcus aureus greater than 85%.

[0060] Nanotechnology is increasingly being used in textiles, and silica nanoparticles, with their unique properties and excellent chemical stability, are widely used in the development of functional textiles with super-hydrophobic properties. At the same time, mesoporous silica nanoparticles have very outstanding advantages in drug delivery systems, mainly including good biocompatibility, low cytotoxicity, adjustable pore size, uniform particle size, high specific surface area, easily modified surface properties, high thermal stability and chemical stability. These characteristics give mesoporous silica particles efficient drug loading and release performance. Tannic acid is a plant-derived high-molecular-weight polyphenol compound with strong biological and pharmacological activities, such as bactericidal disinfection and anti-oxidation, and has a wide range of applications in medicine, food, daily chemicals, etc. Using mesoporous silica nanoparticles to load and release tannic acid has good biocompatibility, antibacterial and other biological functions. Compared with the traditional method of directly treating fabrics with tannic acid, it can prolong the antibacterial time and improve the durability of the fabric. In view of this, the above principle is used to prepare the hemp fabric of the present invention, which has the following functions:

[0061] 1. About antibacterial function:

[0062] The antibacterial nanoparticles, prepared by combining mesoporous silica nanoparticles with tannic acid, have a porous structure. When stirred and complexed with tannic acid, the tannic acid molecules penetrate into the porous structure of the mesoporous silica nanoparticles. After preparing a coating solution composed of a mixed solution of mesoporous silica nanoparticles, aminosilicone emulsion, and tannic acid, it is then impregnated and coated onto the surface of hemp fabric to form a coating. At this point, the antibacterial nanoparticles within the coating have a "slow-release" effect, meaning that the tannic acid is slowly released from the porous structure of the mesoporous silica nanoparticles, extending the antibacterial effect. This overcomes the drawback of hemp fabrics, which suffers from the loss of most of their antibacterial components during fiber processing and weaving, significantly reducing their antibacterial properties.

[0063] 2. About water repellency:

[0064] Since the silica nanoparticles themselves have super hydrophobic properties, and the hemp fabric also has certain water repellency after plasma pretreatment, the coating on the surface of the hemp fabric further enhances the water barrier properties of the hemp fabric. The hemp fabric after plasma treatment has improved the bonding strength of the coating due to the etching effect, forming an all-round water-repellent barrier on the surface of the hemp fiber, which greatly improves the water repellency of the present invention.

[0065] 3. About breathability:

[0066] Since the hemp fabric modified by the traditional coating coating method will inevitably affect the air permeability, the present invention pre-processes the hemp fabric with plasma, so that the amino, hydroxyl, carboxyl and other groups agglomerated on the surface of the hemp fiber in the hemp fabric are dispersed. At this time, the hemp fabric is more breathable than when not subjected to plasma pre-processing. Then, when the dip coating is processed, the antibacterial nanoparticles can be covalently bonded with the dispersed amino, hydroxyl, carboxyl and other groups. Since the air permeability before the combination has been improved, the air permeability of the hemp fabric after the antibacterial nanoparticles is still better than that of the hemp fabric without plasma pre-processing. The antibacterial nanoparticles themselves are also prone to agglomeration in the coating liquid, but after reacting with the dispersed amino, hydroxyl, carboxyl and other groups, they are also dispersed in the coating, solving the problem of uneven mesoporous silica nanoparticles in the coating. Therefore, the coating of the hemp fabric of the present invention not only does not affect the air permeability, but also can improve its air permeability while extending and increasing the antibacterial performance. So this process not only achieves the purpose of enhancing the antibacterial performance, but also improves the air permeability of the fabric.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed thereby. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0068] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for preparing hemp fabric with high antibacterial, water-repellent and breathable properties, characterized in that: The steps include:

1. Preparation of antibacterial nanoparticles: (1) Add tannic acid at a mass ratio of 1:1 between mesoporous silica nanoparticles and tannic acid, stir for 12 hours in the dark, and form antibacterial nanoparticles by complexation; the particle size of the mesoporous silica nanoparticles is 50-100 nm, and the pore size is 5-20 nm; 2. Plasma pretreatment of hemp fabric: (2) The linen fabric is subjected to plasma pretreatment with a frequency of 5-10 MHz, a helium flow rate of 30-50 L / min, a discharge voltage of 3-10 kV, and a discharge time of 50-120 s; 3. Impregnation treatment: (3) 5-20 g of the antibacterial nanoparticles prepared in step (1) are uniformly dispersed in the aminosilicone oil emulsion to form a coating liquid consisting of a mixed solution of mesoporous silica nanoparticles, aminosilicone oil emulsion, and tannic acid; (4) Immerse 100g of hemp fabric pretreated with plasma in the coating liquid and stir it. The stirring speed is set to 200-600r / min and the stirring time is 10min. The coating liquid is evenly applied on the surface of the hemp fabric. (5) After the soaking is completed, take out the hemp fabric and o C conditions to obtain a hemp fabric with high antibacterial, water-repellent and breathable properties with a coating on the surface; in the coating uniformly formed on the surface of the hemp fabric, the coating thickness is 0.1-0.5 mm, and the solid content of the mesoporous silica nanoparticles in the hemp fabric is 5%-20%.

2. The method for preparing the hemp fabric with high antibacterial, water-repellent and breathable properties according to claim 1, wherein: In the step (2), the plasma is oxygen or air plasma, with a frequency of 8 MHz, a helium flow rate of 40 L / min, a discharge voltage of 5 kV, and a discharge time of 50 s.

3. The method for preparing the hemp fabric with high antibacterial, water-repellent and breathable properties according to claim 1, wherein: In the step (3), the treatment conditions are a stirring speed of 500 r / min, a stirring time of 10 min, and a stirring time of 120 o C dry.

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