A method for preparing natural antibacterial silk fabric based on plant extracts

Abstract

This invention relates to antibacterial silk fabrics and provides a method for preparing a natural antibacterial silk fabric based on plant extracts. The method includes: a silk fabric as a base, the surface of which is loaded with an antibacterial finishing component. The antibacterial finishing component, by mass parts, comprises: 8-12 parts of a composite plant antibacterial extract, 1-3 parts of nano-oxide, 5-7 parts of a crosslinking agent, 1-3 parts of a plant-based softener, 1-2 parts of a moisturizing stabilizer, and 75-85 parts of deionized water. The composite plant antibacterial extract is composed of aloe vera extract and acacia extract in a 1:1 mass ratio. The composite plant antibacterial extract used in this invention is the main antibacterial component. It is naturally derived, free of heavy metals and toxic synthetic chemicals, non-irritating to human skin, and biodegradable after use. Furthermore, the introduction of the plant-based softener and moisturizing stabilizer further enhances the fabric's skin-friendliness and comfort.

Description

Technical Field

[0001] This invention relates to antibacterial silk fabrics, specifically a method for preparing natural antibacterial silk fabrics based on plant extracts. Background Technology

[0002] Silk fabrics are widely used in high-end clothing and home textiles due to their excellent skin-friendliness, breathability, and comfort. However, silk fabrics are highly susceptible to bacterial growth in damp environments, which not only affects hygiene but can also lead to odors, discoloration, and even degradation. Therefore, endowing silk fabrics with durable and safe antibacterial properties has become a hot research topic in the industry. Currently, common antibacterial treatment methods mainly include metal ion impregnation and finishing with organic synthetic antibacterial agents.

[0003] While existing antibacterial silk fabrics and their preparation methods can inhibit bacterial growth to some extent, they still have significant shortcomings. On the one hand, metal ion antibacterial agents pose a risk of heavy metal leaching, and long-term contact may cause skin allergies or environmental pollution. Organic synthetic antibacterial agents often have poor biodegradability, and some varieties are irritating to human skin, failing to meet green environmental protection principles. On the other hand, many natural antibacterial finishing agents have weak bonding with silk fibers and poor wash resistance; their antibacterial effect significantly decreases after several washes, making it difficult to meet practical usage needs. Furthermore, existing antibacterial finishing processes often involve high-temperature and strong alkaline conditions, which can easily damage the protein structure of silk fibers, affecting the fabric's feel and luster. Therefore, how to develop a natural antibacterial silk fabric that is highly efficient, durable, safe, and environmentally friendly, while avoiding damage to the silk matrix during the finishing process, has become an urgent technical problem to be solved in this field. Summary of the Invention

[0004] In view of the problems in the existing technology of antibacterial finishing of silk fabrics, such as the chemically synthesized antibacterial agents easily irritating human skin, and the synthetic resin crosslinking agents used in combination forming a rigid film on the fiber surface, resulting in hardness, roughness and poor water resistance of the fabric, the present invention aims to provide a natural antibacterial silk fabric based on plant extracts with improved structure that can effectively solve the above problems and the preparation method thereof.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a natural antibacterial silk fabric based on plant extracts, comprising: The silk fabric serving as the base has an antibacterial finishing component loaded on its surface, the antibacterial finishing component comprising, by weight parts: The mixture contains 8-12 parts of compound plant antibacterial extract, 1-3 parts of nano oxide, 5-7 parts of crosslinking agent, 1-3 parts of plant-based softener, 1-2 parts of moisturizing stabilizer, and 75-85 parts of deionized water. The compound plant antibacterial extract is composed of aloe vera extract and acacia extract in a 1:1 mass ratio.

[0006] Preferably, the nano-oxide is one or a mixture of two of nano-titanium dioxide and nano-zinc oxide, wherein the mass ratio of nano-titanium dioxide to nano-zinc oxide in the mixture is (1:2) to (2:1), and the crosslinking agent is citric acid.

[0007] Preferably, the plant-based softener is a composition obtained by compounding plant oil softener and bacterial cellulose in a 1:1 mass ratio.

[0008] Preferably, the moisturizing stabilizer is a plant polysaccharide or glycerin.

[0009] Preferably, the plant polysaccharide is sodium alginate or xanthan gum.

[0010] A method for preparing a natural antibacterial silk fabric based on plant extracts includes the following steps: Step 1: Prepare the compound plant antibacterial extract; Step 2: Mix the compound plant antibacterial extract, the nano oxide, the crosslinking agent, the plant-based softener, the moisturizing stabilizer, and the deionized water, and adjust the pH to weakly acidic or neutral to prepare an antibacterial finishing solution; Step 3: Immerse the pretreated silk fabric substrate in the antibacterial finishing solution for impregnation, and use a two-dip and two-roll process to ensure that the antibacterial finishing components are evenly loaded onto the surface of the silk fabric substrate. Step 4: The impregnated silk fabric base is successively dried at low temperature and baked at high temperature for curing. After cooling, a natural antibacterial silk fabric is obtained.

[0011] Preferably, in the step one of extracting the compound plant antibacterial extract, ethanol with a mass fraction of 60% to 80% is used as the extraction solvent, the material-liquid ratio is controlled at 1:5 to 1:7, and the extraction is carried out by heating and reflux at a temperature of 70℃ to 90℃ for 2 to 3 hours each time. After the extraction is repeated twice, the filtrates are combined, concentrated and dried to obtain the compound plant antibacterial extract.

[0012] Preferably, in the process of preparing the antibacterial finishing solution in step two, the mixing and stirring speed is controlled at 200 r / min to 500 r / min, and the stirring time is 15 minutes to 30 minutes to ensure that each component is fully dispersed to form a uniform and stable system.

[0013] Preferably, in the third step of impregnation, the silk fabric substrate is first cleaned and impurities removed and then dried at a temperature of 40℃~50℃ to constant weight to complete the pretreatment; the impregnation temperature is 75℃~85℃, the impregnation time is 30~60 minutes, and the roll-off rate of the two-dip and two-roll process is controlled at 70%~80%.

[0014] Preferably, in step four, the low-temperature drying and high-temperature baking curing steps, the low-temperature drying temperature is 80℃~100℃, and the low-temperature drying time is 10~15 minutes; the high-temperature baking curing temperature is 180℃~220℃, and the high-temperature baking curing time is 2~5 minutes.

[0015] This invention provides a method for preparing a natural antibacterial silk fabric based on plant extracts. It has the following beneficial effects: 1. The compound plant antibacterial extract used in this invention is the main antibacterial ingredient. It is naturally derived, free of heavy metals and toxic synthetic chemicals, non-irritating to human skin, and biodegradable after use. At the same time, the introduction of plant-based softeners and moisturizing stabilizers further enhances the skin-friendliness and comfort of the fabric.

[0016] 2. This invention uses citric acid as a crosslinking agent, and combines it with a stepped curing process of two dips and two nips followed by low-temperature drying and high-temperature baking, which promotes the firm bonding of plant extracts and nano-oxides to the outer wall of silk fibers, constructing a stable crosslinked network skeleton and extending the effective period of the fabric's antibacterial function.

[0017] 3. This invention reduces the frictional resistance between fibers, while the moisturizing ingredients use hydration groups to adsorb moisture, maintaining the physicochemical balance inside the antibacterial functional coating layer. While achieving durable antibacterial function, it still retains its unique smooth touch and draping properties. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] As one aspect of the present invention, a natural antibacterial silk fabric based on plant extracts is provided, comprising a silk fabric as a base, the surface of which is loaded with an antibacterial finishing component. The antibacterial finishing component comprises, by weight parts: 8-12 parts of a compound plant antibacterial extract, 1-3 parts of nano-oxide, 5-7 parts of a crosslinking agent, 1-3 parts of a plant-based softener, 1-2 parts of a moisturizing stabilizer, and 75-85 parts of deionized water. The compound plant antibacterial extract is composed of aloe vera extract and acacia extract in a 1:1 weight ratio.

[0020] Preferably, the nano-oxide is one or a mixture of nano-titanium dioxide and nano-zinc oxide, and when the two are mixed, the mass ratio of nano-titanium dioxide to nano-zinc oxide is (1:2) to (2:1). The crosslinking agent is citric acid. The plant-based softener is a composition obtained by compounding plant oil softener and bacterial cellulose in a 1:1 mass ratio. The moisturizing stabilizer is plant polysaccharide or glycerin, preferably sodium alginate or xanthan gum.

[0021] As another aspect of the present invention, a method for preparing the above-mentioned natural antibacterial silk fabric is provided, comprising the following steps: Step 1: Using 60%–80% ethanol as the extraction solvent, the material-to-liquid ratio is controlled at 1:5–1:7. The mixture is heated and refluxed at 70℃–90℃ for 2–3 hours per extraction. The extraction is repeated twice. The filtrates are then combined, concentrated, and dried to obtain the compound plant antibacterial extract. Step 2: Mix the compound plant antibacterial extract, nano oxides, crosslinking agent, plant-based softener, moisturizing stabilizer and deionized water, adjust the pH to weakly acidic or neutral, and prepare an antibacterial finishing solution. The mixing and stirring speed is controlled at 200 r / min to 500 r / min, and the stirring time is 15 minutes to 30 minutes to ensure that each component is fully dispersed to form a uniform and stable system. Step 3: Immerse the pretreated silk fabric substrate in the antibacterial finishing solution. The silk fabric substrate is first cleaned and impurities removed, and then dried at 40℃~50℃ to constant weight to complete the pretreatment. The immersion temperature is 75℃~85℃, and the immersion time is 30~60 minutes. A two-dip and two-nip process is used to ensure that the antibacterial finishing components are evenly loaded onto the surface of the silk fabric substrate. The pick-up rate of the two-dip and two-nip process is controlled at 70%~80%. Step 4: The impregnated silk fabric base is subjected to low-temperature drying and high-temperature baking curing in sequence. The low-temperature drying temperature is 80℃~100℃ and the low-temperature drying time is 10~15 minutes. The high-temperature baking curing temperature is 180℃~220℃ and the high-temperature baking curing time is 2~5 minutes. After cooling, the natural antibacterial silk fabric is obtained.

[0022] To better illustrate the formulation and preparation method of the natural antibacterial silk fabric of the present invention, the following examples are provided.

[0023] Example 1

[0024] A natural antibacterial silk fabric based on plant extracts, wherein the antibacterial finishing components are as follows by weight parts: Eight parts of a compound plant antibacterial extract were prepared by mixing aloe vera extract and acacia extract in a 1:1 mass ratio. 1 part of nano titanium dioxide; Citric acid 5 parts; One part of plant-based fabric softener, wherein the plant-based fabric softener is a composition obtained by compounding plant oil fabric softener and bacterial cellulose in a 1:1 mass ratio; 1 part sodium alginate; 75 parts of deionized water.

[0025] The preparation method of the above-mentioned natural antibacterial silk fabric includes the following steps: Step 1: Preparation of compound plant antibacterial extract: Using 60% ethanol as the extraction solvent, the material-to-liquid ratio is controlled at 1:5. The mixture is heated and refluxed at 70℃ for 2 hours each time. The extraction is repeated twice. The filtrates are combined, concentrated and dried to obtain the compound plant antibacterial extract. Step 2: Mix the compound plant antibacterial extract, nano oxides, crosslinking agent, plant-based softener, moisturizing stabilizer, and deionized water, and adjust the pH to weakly acidic or neutral to prepare an antibacterial finishing solution; the mixing and stirring speed is controlled at 200 r / min and the stirring time is 15 minutes to ensure that each component is fully dispersed to form a uniform and stable system; Step 3: Immerse the pretreated silk fabric substrate in the antibacterial finishing solution using a two-dip, two-nip process to ensure the antibacterial finishing components are evenly distributed on the surface of the silk fabric substrate. The silk fabric substrate is first cleaned to remove impurities and then dried at 40°C to constant weight to complete the pretreatment. The immersion temperature is 75°C, the immersion time is 30 minutes, and the roll-off rate of the two-dip, two-nip process is controlled at 70%. Step 4: The impregnated silk fabric base is subjected to low-temperature drying and high-temperature baking curing in sequence. After cooling, a natural antibacterial silk fabric is obtained. The low-temperature drying temperature is 80℃ and the low-temperature drying time is 10 minutes. The high-temperature baking curing temperature is 180℃ and the high-temperature baking curing time is 2 minutes.

[0026] Example 2

[0027] A natural antibacterial silk fabric based on plant extracts, wherein the antibacterial finishing components are as follows by weight parts: Ten parts of a compound plant antibacterial extract, which is prepared by mixing aloe vera extract and acacia extract in a 1:1 mass ratio; Two parts of nano zinc oxide; Citric acid 6 parts; Two parts of plant-based fabric softener, wherein the plant-based fabric softener is a composition obtained by compounding plant oil fabric softener and bacterial cellulose in a 1:1 mass ratio; 1.5 parts xanthan gum; 80 parts of deionized water.

[0028] The preparation method of the above-mentioned natural antibacterial silk fabric includes the following steps: Step 1: Preparation of compound plant antibacterial extract: Using 70% ethanol as the extraction solvent, the material-to-liquid ratio is controlled at 1:6. The mixture is heated and refluxed at 80℃ for 2.5 hours per extraction. The extraction is repeated twice. The filtrates are combined, concentrated and dried to obtain the compound plant antibacterial extract. Step 2: Mix the compound plant antibacterial extract, nano oxides, crosslinking agent, plant-based softener, moisturizing stabilizer, and deionized water, and adjust the pH to weakly acidic or neutral to prepare an antibacterial finishing solution; the mixing and stirring speed is controlled at 350 r / min and the stirring time is 22 minutes to ensure that each component is fully dispersed to form a uniform and stable system; Step 3: Immerse the pretreated silk fabric substrate in the antibacterial finishing solution using a two-dip, two-nip process to ensure the antibacterial finishing components are evenly distributed on the surface of the silk fabric substrate. The silk fabric substrate is first cleaned to remove impurities and then dried at 45°C to constant weight to complete the pretreatment. The immersion temperature is 80°C, the immersion time is 45 minutes, and the roll-off rate of the two-dip, two-nip process is controlled at 75%. Step 4: The impregnated silk fabric base is subjected to low-temperature drying and high-temperature baking curing in sequence. After cooling, a natural antibacterial silk fabric is obtained. The low-temperature drying temperature is 90℃ and the low-temperature drying time is 12 minutes. The high-temperature baking curing temperature is 200℃ and the high-temperature baking curing time is 3 minutes.

[0029] Example 3

[0030] A natural antibacterial silk fabric based on plant extracts, wherein the antibacterial finishing components are as follows by weight parts: The compound plant antibacterial extract consists of 12 parts, which are prepared by mixing aloe vera extract and acacia extract in a 1:1 mass ratio. Three parts of a mixture of nano-titanium dioxide and nano-zinc oxide, with the nano-titanium dioxide and nano-zinc oxide mixed in a 1:1 mass ratio; Citric acid 7 parts; Three parts of plant-based fabric softener, wherein the plant-based fabric softener is a composition obtained by compounding plant oil fabric softener and bacterial cellulose in a 1:1 mass ratio; 2 parts glycerin; 85 parts of deionized water; The preparation method of the above-mentioned natural antibacterial silk fabric includes the following steps: Step 1: Preparation of compound plant antibacterial extract: Using 80% ethanol as the extraction solvent, the material-to-liquid ratio is controlled at 1:7. The mixture is heated and refluxed at 90℃ for 3 hours each time. The extraction is repeated twice. The filtrates are combined, concentrated and dried to obtain the compound plant antibacterial extract. Step 2: Mix the compound plant antibacterial extract, nano oxides, cross-linking agent, plant-based softener, moisturizing stabilizer, and deionized water, and adjust the pH to weakly acidic or neutral to prepare an antibacterial finishing solution; the mixing and stirring speed is controlled at 500 r / min and the stirring time is 30 minutes to ensure that each component is fully dispersed to form a uniform and stable system; Step 3: Immerse the pretreated silk fabric substrate in the antibacterial finishing solution using a two-dip, two-nip process to ensure the antibacterial finishing components are evenly distributed on the surface of the silk fabric substrate. The silk fabric substrate is first cleaned to remove impurities and then dried at 50°C to constant weight to complete the pretreatment. The immersion temperature is 85°C, the immersion time is 60 minutes, and the roll-off rate of the two-dip, two-nip process is controlled at 80%. Step 4: The impregnated silk fabric base is subjected to low-temperature drying and high-temperature baking curing in sequence. After cooling, a natural antibacterial silk fabric is obtained. The low-temperature drying temperature is 100℃ and the low-temperature drying time is 15 minutes. The high-temperature baking curing temperature is 220℃ and the high-temperature baking curing time is 5 minutes.

[0031] Comparative Example A comparative example provides a natural antibacterial silk fabric in which no compound plant antibacterial extract is added to the antibacterial finishing component, but an equal amount of deionized water is used instead. The remaining components are the same as in Example 2, and the textual description of the steps in the preparation method is the same as in Example 2. Only the parameter values ​​are the same as in Example 2.

[0032] Experimental Example The silk fabrics obtained in Examples 1-3 and the comparative examples were selected for antibacterial performance and washability tests. The test bacteria were Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 8739). The antibacterial rate was tested after 10 washes, and the results are shown in Table 1 below: Table 1 Performance test results of antibacterial silk fabric

[0033] The results showed that the natural antibacterial silk fabrics of Examples 1-3 of the present invention had excellent antibacterial effects against Staphylococcus aureus and Escherichia coli, with an initial inhibition rate of >94%, and the inhibition rate remained above 85% after 10 washes, exhibiting good wash resistance. Among them, Example 3 had the best antibacterial performance due to the highest amount of composite plant antibacterial extract and nano oxides. The comparative example, which did not add plant antibacterial extract, showed a significant decrease in antibacterial effect, indicating that the composite plant antibacterial extract of the present invention is the key component that imparts highly efficient antibacterial properties to the fabric.

[0034] In summary, the natural antibacterial silk fabric based on plant extracts provided by this invention has efficient and long-lasting antibacterial properties, and is soft, skin-friendly, safe and environmentally friendly, making it suitable for use in high-value-added textiles such as underwear and home textiles.

[0035] 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 natural antibacterial silk fabric based on plant extracts, characterized in that, include: The silk fabric serving as the base has an antibacterial finishing component loaded on its surface, the antibacterial finishing component comprising, by weight parts: The mixture contains 8-12 parts of compound plant antibacterial extract, 1-3 parts of nano oxide, 5-7 parts of crosslinking agent, 1-3 parts of plant-based softener, 1-2 parts of moisturizing stabilizer, and 75-85 parts of deionized water. The compound plant antibacterial extract is composed of aloe vera extract and acacia extract in a 1:1 mass ratio.

2. The natural antibacterial silk fabric based on plant extracts according to claim 1, characterized in that, The nano-oxide is one or a mixture of two of nano-titanium dioxide and nano-zinc oxide, wherein the mass ratio of nano-titanium dioxide to nano-zinc oxide in the mixture is (1:2) to (2:1), and the crosslinking agent is citric acid.

3. The natural antibacterial silk fabric based on plant extracts according to claim 1, characterized in that, The plant-based softener is a composition obtained by compounding vegetable oil softener and bacterial cellulose in a 1:1 mass ratio.

4. The natural antibacterial silk fabric based on plant extracts according to claim 1, characterized in that, The moisturizing stabilizer is a plant polysaccharide or glycerin.

5. The natural antibacterial silk fabric based on plant extracts according to claim 4, characterized in that, The plant polysaccharide is sodium alginate or xanthan gum.

6. A method for preparing a natural antibacterial silk fabric based on plant extracts, used to prepare the natural antibacterial silk fabric based on plant extracts as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Prepare the compound plant antibacterial extract; Step 2: Mix the compound plant antibacterial extract, the nano oxide, the crosslinking agent, the plant-based softener, the moisturizing stabilizer, and the deionized water, and adjust the pH to weakly acidic or neutral to prepare an antibacterial finishing solution; Step 3: Immerse the pretreated silk fabric substrate in the antibacterial finishing solution for impregnation, and use a two-dip and two-roll process to ensure that the antibacterial finishing components are evenly loaded onto the surface of the silk fabric substrate. Step 4: The impregnated silk fabric base is successively dried at low temperature and baked at high temperature for curing. After cooling, a natural antibacterial silk fabric is obtained.

7. The method for preparing a natural antibacterial silk fabric based on plant extracts according to claim 6, characterized in that, In the step one of extracting the compound plant antibacterial extract, ethanol with a mass fraction of 60% to 80% is used as the extraction solvent, the material-liquid ratio is controlled at 1:5 to 1:7, and the extraction is carried out by heating and reflux at a temperature of 70℃ to 90℃ for 2 to 3 hours each time. After the extraction is repeated twice, the filtrates are combined, concentrated and dried to obtain the compound plant antibacterial extract.

8. The method for preparing a natural antibacterial silk fabric based on plant extracts according to claim 6, characterized in that, In the second step of preparing the antibacterial finishing solution, the mixing and stirring speed is controlled at 200r / min to 500r / min, and the stirring time is 15 minutes to 30 minutes to ensure that each component is fully dispersed to form a uniform and stable system.

9. The method for preparing a natural antibacterial silk fabric based on plant extracts according to claim 5, characterized in that, In the third step of the impregnation process, the silk fabric substrate is first cleaned and impurities removed and then dried at a temperature of 40℃~50℃ to constant weight to complete the pretreatment; the impregnation temperature is 75℃~85℃, the impregnation time is 30~60 minutes, and the roll-off rate of the two-dip and two-roll process is controlled at 70%~80%.

10. The method for preparing a natural antibacterial silk fabric based on plant extracts according to claim 6, characterized in that, In step four, the low-temperature drying and high-temperature baking curing process, the low-temperature drying temperature is 80℃~100℃ and the low-temperature drying time is 10~15 minutes; the high-temperature baking curing temperature is 180℃~220℃ and the high-temperature baking curing time is 2~5 minutes.

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