Antibacterial moisture-absorbing and deodorizing material, preparation method thereof, and application thereof

Abstract

The present invention proposes an antibacterial moisture-absorbing and deodorizing material and its preparation method and application, which belong to the field of material technology. After bentonite is modified with a silane coupling agent with a double bond, it is copolymerized with an acrylic monomer to prepare a bentonite / sodium polyacrylate composite material, which is embedded in a calcium alginate layer, and the surface is subjected to a condensation reaction with a silk fibroin peptide, and then coated with a layer of Ag-Cu / phytic acid layer to prepare an antibacterial moisture-absorbing and deodorizing material. The antibacterial moisture-absorbing and deodorizing material prepared by the present invention has a wide source of raw materials, low preparation cost, good antibacterial, moisture-absorbing, breathable, deodorizing, safe, non-toxic, non-sensitizing, degradable, green and environmentally friendly, improves the risk of perianal and perineal infection of users, and is used to prepare disposable sanitary products such as nursing pads and diapers, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of materials, and in particular to an antibacterial, moisture-absorbing and deodorizing material, a preparation method and application thereof. Background Art

[0002] Disposable sanitary products, mainly including sanitary napkins, baby diapers, and adult incontinence products, are "disposable" items widely used by women, infants, the elderly, the weak, the sick and the disabled. They are used to absorb excrement to keep the skin, clothes, and bedding dry and clean.

[0003] Currently, disposable sanitary products such as infant diapers, pull-up pants, sanitary napkins for women, and adult incontinence products sold on the market mostly use a multi-layer structure of a non-woven surface layer combined with an internal water-absorbent resin layer and a bottom leak-proof layer. However, due to the particularity of the parts where disposable sanitary products are used and the particularity of the user population, disposable sanitary products can easily become a breeding ground for bacteria, thereby causing users to be invaded by bacteria, causing itching, odor, ulcers and other diseases, seriously endangering the health of users. At the same time, especially in hot summer, due to high temperature and high humidity, users will feel more uncomfortable.

[0004] Therefore, a kind of disposable sanitary material with antibacterial, moisture absorption, deodorizing material is badly in need of. Summary of the Invention

[0005] The purpose of the present invention is to propose an antibacterial, moisture-absorbing and deodorizing material, its preparation method and application. The raw material source is wide, the preparation cost is low, and it has good antibacterial, moisture-absorbing, breathable and deodorizing properties. It is safe, non-toxic, non-allergenic, degradable, green and environmentally friendly, and reduces the risk of anal and perineal infections in users. It is used to prepare disposable sanitary products such as nursing pads and diapers, and has broad application prospects.

[0006] The technical solution of the present invention is achieved as follows:

[0007] The present invention provides a preparation method of an antibacterial, moisture-absorbing and deodorizing material. The method comprises the following steps: modifying bentonite with a silane coupling agent having a double bond, copolymerizing the bentonite with an acrylic acid monomer to prepare a bentonite / sodium polyacrylate composite material, embedding the bentonite in a calcium alginate layer, subjecting the surface to a condensation reaction with a silk fibroin peptide, and then coating the composite with an Ag-Cu / phytic acid layer to prepare the antibacterial, moisture-absorbing and deodorizing material.

[0008] As a further improvement of the present invention, the following steps are included:

[0009] S1. Preparation of modified bentonite: Bentonite was added to ethanol, a silane coupling agent having a double bond was added, the mixture was heated and stirred to react, filtered, washed, and dried to obtain modified bentonite;

[0010] S2. Preparation of bentonite / sodium polyacrylate composite material: modified bentonite, acrylic acid monomer and sodium bisulfite were added to water, heated with stirring, an initiator was added, the reaction was stirred, the pH of the solution was adjusted with sodium hydroxide, filtered, washed, dried, and ball milled to obtain a bentonite / sodium polyacrylate composite material;

[0011] S3. Encapsulation: Sodium alginate and an emulsifier are dissolved in water, bentonite / sodium polyacrylate composite material is added, and the mixture is stirred to obtain an aqueous phase. The aqueous phase is added dropwise to the fish oil, emulsified, and a calcium salt solution is added dropwise. The mixture is cured at room temperature, filtered, washed, and dried to obtain encapsulated microspheres.

[0012] S4. Modification of silk fibroin peptide: Add the embedded microspheres to water, add NHS and EDC, stir to activate, add silk fibroin peptide, stir to react, filter, wash, and freeze-dry to produce modified microspheres;

[0013] S5. Ag-Cu / phytic acid coating: add the modified microspheres into water, add phytic acid and dipotassium hydrogen phosphate, heat and stir to react, add silver nitrate and copper salt, stir to react, filter, wash, and dry to obtain an antibacterial, moisture-absorbing and deodorizing material.

[0014] As a further improvement of the present invention, the mass ratio of the bentonite and the silane coupling agent with a double bond in step S1 is 10:2-3, the temperature of the heating and stirring reaction is 45-55° C., and the time is 2-4 hours. The silane coupling agent with a double bond is selected from at least one of KH570, A151, and A171.

[0015] As a further improvement of the present invention, in step S2, the mass ratio of the modified bentonite, acrylic acid monomer, sodium bisulfite and initiator is 7-12:17-22:0.2-0.3:0.01-0.02, the initiator is selected from at least one of sodium persulfate, potassium persulfate and ammonium persulfate, the acrylic acid monomer includes acrylic acid, methyl methacrylate and ethyl acrylate in a mass ratio of 3-5:2-4:4-6, the heating temperature is 65-75° C., the stirring reaction time is 3-5 hours, and the pH value of the solution is adjusted to 9-10.

[0016] As a further improvement of the present invention, the emulsifier in step S3 is selected from at least one of Tween-20, Tween-40, Tween-60, Tween-80, and Tween-85, and the mass ratio of the sodium alginate, emulsifier, and bentonite / sodium polyacrylate composite material is 15-20:0.5-1:8-12.

[0017] As a further improvement of the present invention, in step S4, the mass ratio of the embedded microspheres, NHS, EDC and silk fibroin peptide is 10-12:1-2:1-2:3-5, and the stirring reaction time is 10-14 hours.

[0018] As a further improvement of the present invention, the mass ratio of the modified microspheres, phytic acid, dipotassium hydrogen phosphate, silver nitrate and copper salt in step S5 is 10-12:3-5:0.2-0.3:0.1-0.2:0.15-0.2, the temperature of the heating and stirring reaction is 35-45°C, the time is 4-7h, the copper salt is selected from at least one of copper chloride, copper sulfate and copper nitrate, and the stirring reaction time is 0.5-1.5h.

[0019] The present invention further protects an antibacterial, moisture-absorbing and deodorizing material prepared by the above-mentioned preparation method.

[0020] The present invention further protects the use of the antibacterial, moisture-absorbing and deodorizing material in the preparation of disposable sanitary products.

[0021] The present invention further protects a panty liner comprising a skin-friendly surface layer, an intermediate layer and a bottom leak-proof layer, wherein the intermediate layer is the above-mentioned antibacterial, moisture-absorbing and deodorizing material with a filling thickness of 1-2 mm, the skin-friendly surface layer is a cotton layer, and the bottom leak-proof layer is a PET resin layer.

[0022] The present invention has the following beneficial effects:

[0023] The present invention selects bentonite as one of the raw materials. Bentonite is a natural clay mineral whose main component is montmorillonite. It has extremely strong water absorption and expansion properties and can absorb water several times its own weight. After absorbing water, it expands to form a gel to lock in the water. After absorbing water, the bentonite forms a gel-like substance, which effectively prevents liquid backseepage. In addition, bentonite can absorb odor molecules, such as ammonia and hydrogen sulfide molecules, to reduce the odor of urine and feces.

[0024] However, bentonite's water absorption rate is usually lower than that of synthetic resin, and it may not perform well in scenarios where rapid liquid absorption is required. It is easy to form lumps after absorbing water, which reduces the dispersibility of the material and may cause discomfort to users. In addition, its liquid absorption capacity is limited and it is easy to saturate, leading to leakage risks. Dust may be generated during the processing of bentonite powder, which also limits its application.

[0025] Therefore, the present invention modifies bentonite with a silane coupling agent having a double bond and copolymerizes it with an acrylic monomer to prepare an organic-inorganic composite copolymer. The organic-inorganic composite copolymer not only greatly improves the water absorption speed, but also significantly increases the saturated water absorption capacity, greatly reduces the risk of leakage, reduces the risk of dust during processing, and avoids the risk of bentonite absorbing water to form hard lumps. Instead, it forms a soft gel state, thereby improving the comfort of use.

[0026] In addition, the present invention coats the prepared bentonite / sodium polyacrylate composite material with calcium alginate, which further improves the water absorption performance of the material, and has good biodegradability and compatibility, low toxicity and environmental protection. After absorbing moisture, it forms a hydrophilic gel, and the "free water" combined with the hydrophilic group becomes a channel for oxygen transmission. Oxygen undergoes an adsorption-diffusion-desorption process, thereby having good air and oxygen permeability. In addition, it can also adsorb odor molecules through van der Waals forces, further reducing odor.

[0027] The carboxyl groups on the surface of calcium alginate can further condense with silk fibroin peptides, allowing the silk fibroin peptides to adhere to its surface, making the material more delicate and silky. At the same time, it is non-toxic and non-allergenic, and can also improve the mechanical properties of the material. It has certain antibacterial and anti-inflammatory properties, and can inhibit the growth and reproduction of bacteria, thereby improving the perineal environment and avoiding infection.

[0028] Phytic acid is introduced into the surface of the modified microspheres through reaction. Phytic acid, silk fibroin peptide, calcium alginate, etc. can react with Ag. + and Cu 2+ The metal ions are fixed by complexation and can be adsorbed on the surface of bacteria, which changes the permeability of the cell membrane through the membrane fusion mechanism, causing the cytoplasm to leak and the bacteria to die, thus having excellent antibacterial properties. + and Cu 2+ The two have a synergistic effect.

[0029] The antibacterial, moisture-absorbing and deodorizing material prepared by the present invention has a wide source of raw materials and low preparation cost. It has good antibacterial, moisture-absorbing, breathable and deodorizing properties, is safe, non-toxic, non-allergenic, degradable, and green and environmentally friendly. It reduces the risk of perianal and perineal infections in users and is used to prepare disposable sanitary products such as nursing pads and diapers, and has broad application prospects. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] NHS, N-hydroxysuccinimide; EDC, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide.

[0032] Example 1

[0033] This embodiment provides a method for preparing an antibacterial, moisture-absorbing and deodorizing material, comprising the following steps:

[0034] S1. Preparation of modified bentonite: 10 g of bentonite was added to 150 mL of ethanol, 2 g of silane coupling agent A151 was added, the mixture was heated to 45 ° C, stirred for 2 h, filtered, washed, and dried to obtain modified bentonite;

[0035] S2. Preparation of bentonite / sodium polyacrylate composite material: 7 g of modified bentonite, 17 g of acrylic acid monomer and 0.2 g of sodium bisulfite were added to 200 mL of water, heated to 65 ° C, 0.01 g of ammonium persulfate was added, and the reaction was stirred for 3 h. The pH of the solution was adjusted to 9 with sodium hydroxide, filtered, washed, dried, and ball milled for 1 h to obtain a bentonite / sodium polyacrylate composite material;

[0036] The acrylic monomer includes acrylic acid, methyl methacrylate, and ethyl acrylate in a mass ratio of 3:2:4;

[0037] S3. Encapsulation: 15 g of sodium alginate and 0.5 g of Tween-20 were dissolved in 200 mL of water, 8 g of bentonite / sodium polyacrylate composite material was added, and the mixture was stirred for 15 min to prepare an aqueous phase, which was added dropwise to 500 mL of fish oil and emulsified at 8000 rpm for 15 min. 50 mL of a 2 wt% calcium chloride solution was added dropwise, and the mixture was cured at room temperature for 30 min, filtered, washed, and dried to obtain encapsulated microspheres.

[0038] S4. Silk fibroin peptide modification: 10 g of embedded microspheres were added to 200 mL of water, followed by 1 g of NHS and 1 g of EDC. The mixture was stirred for 30 min, and then 3 g of silk fibroin peptide was added. The mixture was stirred for 10 h, filtered, washed, and freeze-dried to obtain modified microspheres.

[0039] S5. Ag-Cu / phytic acid coating: Add 10g of modified microspheres to 200mL of water, add 3g of phytic acid and 0.2g of potassium dihydrogen phosphate, heat to 35°C, stir and react for 4h, add 0.1g of silver nitrate and 0.15g of copper chloride, stir and react for 0.5h, filter, wash, and dry to obtain an antibacterial, hygroscopic and deodorizing material.

[0040] Example 2

[0041] This embodiment provides a method for preparing an antibacterial, moisture-absorbing and deodorizing material, comprising the following steps:

[0042] S1. Preparation of modified bentonite: 10 g of bentonite was added to 150 mL of ethanol, 3 g of silane coupling agent A171 was added, heated to 55 ° C, stirred for 4 h, filtered, washed, and dried to obtain modified bentonite;

[0043] S2. Preparation of bentonite / sodium polyacrylate composite material: 12 g of modified bentonite, 22 g of acrylic acid monomer and 0.3 g of sodium bisulfite were added to 200 mL of water, heated to 75°C, 0.02 g of sodium persulfate was added, and the reaction was stirred for 5 h. The pH of the solution was adjusted to 10 with sodium hydroxide, filtered, washed, dried, and ball-milled for 1 h to obtain a bentonite / sodium polyacrylate composite material;

[0044] The acrylic monomer includes acrylic acid, methyl methacrylate, and ethyl acrylate in a mass ratio of 5:4:6;

[0045] S3. Encapsulation: 20 g of sodium alginate and 1 g of Tween-60 were dissolved in 200 mL of water, 12 g of bentonite / sodium polyacrylate composite material was added, and the mixture was stirred for 15 min to prepare an aqueous phase, which was added dropwise to 500 mL of fish oil and emulsified at 8000 rpm for 15 min. 50 mL of a 2 wt% calcium chloride solution was added dropwise, and the mixture was cured at room temperature for 30 min. The mixture was filtered, washed, and dried to obtain encapsulated microspheres.

[0046] S4. Silk fibroin peptide modification: 12 g of embedded microspheres were added to 200 mL of water, followed by 2 g of NHS and 2 g of EDC. The mixture was stirred and activated for 30 min. 5 g of silk fibroin peptide was then added and stirred for 14 h. The mixture was filtered, washed, and freeze-dried to obtain modified microspheres.

[0047] S5. Ag-Cu / phytic acid coating: Add 12g of modified microspheres to 200mL of water, add 5g of phytic acid and 0.3g of potassium dihydrogen phosphate, heat to 45°C, stir and react for 7h, add 0.2g of silver nitrate and 0.2g of copper nitrate, stir and react for 1.5h, filter, wash, and dry to obtain an antibacterial, hygroscopic and deodorizing material.

[0048] Example 3

[0049] This embodiment provides a method for preparing an antibacterial, moisture-absorbing and deodorizing material, comprising the following steps:

[0050] S1. Preparation of modified bentonite: 10 g of bentonite was added to 150 mL of ethanol, 2.5 g of silane coupling agent KH570 was added, the mixture was heated to 50°C, stirred for 3 h, filtered, washed, and dried to obtain modified bentonite;

[0051] S2. Preparation of bentonite / sodium polyacrylate composite material: 10 g of modified bentonite, 20 g of acrylic acid monomer and 0.25 g of sodium bisulfite were added to 200 mL of water, heated to 70°C, 0.015 g of potassium persulfate was added, and the reaction was stirred for 4 h. The pH of the solution was adjusted to 9.5 with sodium hydroxide, filtered, washed, dried, and ball-milled for 1 h to obtain a bentonite / sodium polyacrylate composite material;

[0052] The acrylic monomer includes acrylic acid, methyl methacrylate, and ethyl acrylate in a mass ratio of 4:3:5;

[0053] S3. Encapsulation: 17 g of sodium alginate and 0.7 g of Tween-85 were dissolved in 200 mL of water, 10 g of bentonite / sodium polyacrylate composite material was added, and the mixture was stirred for 15 min to prepare an aqueous phase, which was added dropwise to 500 mL of fish oil and emulsified at 8000 r / min for 15 min. 50 mL of a 2 wt% calcium chloride solution was added dropwise, and the mixture was cured at room temperature for 30 min, filtered, washed, and dried to obtain encapsulated microspheres.

[0054] S4. Silk fibroin peptide modification: 11 g of embedded microspheres were added to 200 mL of water, followed by 1.5 g of NHS and 1.5 g of EDC. The mixture was stirred and activated for 30 min. 4 g of silk fibroin peptide was added and the mixture was stirred for 12 h. The modified microspheres were filtered, washed, and freeze-dried.

[0055] S5. Ag-Cu / phytic acid coating: Add 11 g of modified microspheres to 200 mL of water, add 4 g of phytic acid and 0.25 g of potassium dihydrogen phosphate, heat to 40°C, stir and react for 5.5 h, add 0.15 g of silver nitrate and 0.17 g of copper sulfate, stir and react for 1 h, filter, wash, and dry to obtain an antibacterial, hygroscopic, and deodorizing material.

[0056] Comparative Example 1

[0057] Compared with Example 3, the difference is that steps S1 and S2 are not performed.

[0058] The details are as follows:

[0059] S1. Encapsulation: 17 g of sodium alginate and 0.7 g of Tween-85 were dissolved in 200 mL of water, 10 g of bentonite was added, and the mixture was stirred for 15 min to prepare an aqueous phase. The aqueous phase was added dropwise to 500 mL of fish oil and emulsified at 8000 rpm for 15 min. 50 mL of a 2 wt% calcium chloride solution was added dropwise and the mixture was cured at room temperature for 30 min. The mixture was filtered, washed, and dried to obtain encapsulated microspheres.

[0060] S2. Silk fibroin peptide modification: 11 g of embedded microspheres were added to 200 mL of water, followed by 1.5 g of NHS and 1.5 g of EDC. The mixture was stirred and activated for 30 min. 4 g of silk fibroin peptide was added and the mixture was stirred for 12 h. The modified microspheres were filtered, washed, and freeze-dried.

[0061] S3. Ag-Cu / phytic acid coating: Add 11g of modified microspheres to 200mL of water, add 4g of phytic acid and 0.25g of potassium dihydrogen phosphate, heat to 40°C, stir and react for 5.5h, add 0.15g of silver nitrate and 0.17g of copper sulfate, stir and react for 1h, filter, wash, and dry to obtain an antibacterial, hygroscopic and deodorizing material.

[0062] Comparative Example 2

[0063] Compared with embodiment 3, the difference is that step S3 is not performed.

[0064] The details are as follows:

[0065] S1. Preparation of modified bentonite: 10 g of bentonite was added to 150 mL of ethanol, 2.5 g of silane coupling agent KH570 was added, the mixture was heated to 50°C, stirred for 3 h, filtered, washed, and dried to obtain modified bentonite;

[0066] S2. Preparation of bentonite / sodium polyacrylate composite material: 10 g of modified bentonite, 20 g of acrylic acid monomer and 0.25 g of sodium bisulfite were added to 200 mL of water, heated to 70°C, 0.015 g of potassium persulfate was added, and the reaction was stirred for 4 h. The pH of the solution was adjusted to 9.5 with sodium hydroxide, filtered, washed, dried, and ball-milled for 1 h to obtain a bentonite / sodium polyacrylate composite material;

[0067] The acrylic monomer includes acrylic acid, methyl methacrylate, and ethyl acrylate in a mass ratio of 4:3:5;

[0068] S3. Silk fibroin peptide modification: 11 g of bentonite / sodium polyacrylate composite was added to 200 mL of water, along with 1.5 g of NHS and 1.5 g of EDC. The mixture was stirred and activated for 30 min. 4 g of silk fibroin peptide was then added and stirred for 12 h. The mixture was filtered, washed, and freeze-dried to produce modified microspheres.

[0069] S4. Ag-Cu / phytic acid coating: Add 11g of modified microspheres to 200mL of water, add 4g of phytic acid and 0.25g of potassium dihydrogen phosphate, heat to 40°C, stir and react for 5.5h, add 0.15g of silver nitrate and 0.17g of copper sulfate, stir and react for 1h, filter, wash, and dry to obtain an antibacterial, hygroscopic and deodorizing material.

[0070] Comparative Example 3

[0071] Compared with embodiment 3, the difference is that step S4 is not performed.

[0072] The details are as follows:

[0073] S1. Preparation of modified bentonite: 10 g of bentonite was added to 150 mL of ethanol, 2.5 g of silane coupling agent KH570 was added, the mixture was heated to 50°C, stirred for 3 h, filtered, washed, and dried to obtain modified bentonite;

[0074] S2. Preparation of bentonite / sodium polyacrylate composite material: 10 g of modified bentonite, 20 g of acrylic acid monomer and 0.25 g of sodium bisulfite were added to 200 mL of water, heated to 70°C, 0.015 g of potassium persulfate was added, and the reaction was stirred for 4 h. The pH of the solution was adjusted to 9.5 with sodium hydroxide, filtered, washed, dried, and ball-milled for 1 h to obtain a bentonite / sodium polyacrylate composite material;

[0075] The acrylic monomer includes acrylic acid, methyl methacrylate, and ethyl acrylate in a mass ratio of 4:3:5;

[0076] S3. Encapsulation: 17 g of sodium alginate and 0.7 g of Tween-85 were dissolved in 200 mL of water, 10 g of bentonite / sodium polyacrylate composite material was added, and the mixture was stirred for 15 min to prepare an aqueous phase, which was added dropwise to 500 mL of fish oil and emulsified at 8000 r / min for 15 min. 50 mL of a 2 wt% calcium chloride solution was added dropwise, and the mixture was cured at room temperature for 30 min, filtered, washed, and dried to obtain encapsulated microspheres.

[0077] S4. Ag-Cu / Phytic Acid Coating: Add 11 g of embedded microspheres to 200 mL of water, along with 4 g of phytic acid and 0.25 g of dipotassium hydrogen phosphate. Heat to 40°C and stir for 5.5 hours. Add 0.15 g of silver nitrate and 0.17 g of copper sulfate and stir for 1 hour. Filter, wash, and dry to produce the antibacterial, moisture-absorbing, and deodorizing material.

[0078] Comparative Example 4

[0079] Compared with Example 3, the difference is that silver nitrate is not added in step S5.

[0080] The details are as follows:

[0081] S5.Cu / phytic acid coating: Add 11g of modified microspheres to 200mL of water, add 4g of phytic acid and 0.25g of potassium dihydrogen phosphate, heat to 40℃, stir and react for 5.5h, add 0.32g of copper sulfate, stir and react for 1h, filter, wash, and dry to obtain an antibacterial, hygroscopic and deodorizing material.

[0082] Comparative Example 5

[0083] Compared with Example 3, the difference is that copper sulfate is not added in step S5.

[0084] The details are as follows:

[0085] S5.Ag / phytic acid coating: Add 11g of modified microspheres to 200mL of water, add 4g of phytic acid and 0.25g of potassium dihydrogen phosphate, heat to 40℃, stir and react for 5.5h, add 0.32g of silver nitrate, stir and react for 1h, filter, wash, and dry to obtain an antibacterial, hygroscopic and deodorizing material.

[0086] Comparative Example 6

[0087] Compared with embodiment 3, the difference is that step S5 is not performed.

[0088] The details are as follows:

[0089] S1. Preparation of modified bentonite: 10 g of bentonite was added to 150 mL of ethanol, 2.5 g of silane coupling agent KH570 was added, the mixture was heated to 50°C, stirred for 3 h, filtered, washed, and dried to obtain modified bentonite;

[0090] S2. Preparation of bentonite / sodium polyacrylate composite material: 10 g of modified bentonite, 20 g of acrylic acid monomer and 0.25 g of sodium bisulfite were added to 200 mL of water, heated to 70°C, 0.015 g of potassium persulfate was added, and the reaction was stirred for 4 h. The pH of the solution was adjusted to 9.5 with sodium hydroxide, filtered, washed, dried, and ball-milled for 1 h to obtain a bentonite / sodium polyacrylate composite material;

[0091] The acrylic monomer includes acrylic acid, methyl methacrylate, and ethyl acrylate in a mass ratio of 4:3:5;

[0092] S3. Encapsulation: 17 g of sodium alginate and 0.7 g of Tween-85 were dissolved in 200 mL of water, 10 g of bentonite / sodium polyacrylate composite material was added, and the mixture was stirred for 15 min to prepare an aqueous phase, which was added dropwise to 500 mL of fish oil and emulsified at 8000 r / min for 15 min. 50 mL of a 2 wt% calcium chloride solution was added dropwise, and the mixture was cured at room temperature for 30 min, filtered, washed, and dried to obtain encapsulated microspheres.

[0093] S4. Silk fibroin peptide modification: 11 g of embedded microspheres were added to 200 mL of water, followed by 1.5 g of NHS and 1.5 g of EDC, and the mixture was stirred and activated for 30 min. 4 g of silk fibroin peptide was added and the mixture was stirred and reacted for 12 h. The mixture was filtered, washed, and freeze-dried to obtain modified microspheres, which were the antibacterial, hygroscopic, and deodorizing materials.

[0094] Test Example 1

[0095] The antibacterial, moisture-absorbing and deodorizing materials prepared in Examples 1-3 or Comparative Examples 1-6 were used as the middle layer with a thickness of 2 mm. The upper and lower surfaces were made of cotton sheets (the thickness of the cotton sheet was 0.5 mm), which were sewn all around to prepare patch sample materials.

[0096] 1. Determination of antibacterial properties

[0097] Take the concentration as (4-5)×10 5100 mL of bacterial suspension (Candida albicans ATCC10231, Staphylococcus epidermidis ATCC12228, Escherichia coli ATCC8739) with a cfu / mL was evenly spread on the surface of a 10 cm diameter culture dish containing nutrient agar. 2 The circular patch sample material was aseptically added to the above-mentioned culture dish and incubated in a 37°C constant temperature incubator for 24 hours. The diameter (cm) of the inhibition zone around the sample material was measured with a vernier caliper. The results are shown in Table 1.

[0098] Table 1

[0099]

[0100] It can be seen from the above table that the antibacterial moisture-absorbing and deodorizing materials prepared in Examples 1-3 of the present invention have good antibacterial properties.

[0101] 2. Determination of hygroscopic properties

[0102] According to the test methods in GB / T 21655.1-2008, "Assessment of Moisture Absorption and Quick-Drying Properties of Textiles," the patch sample materials were tested for their wetting time and liquid water transfer rate. The wetting time is the time period from the initial wetting of the upper and lower surfaces of the antibacterial, moisture-absorbing, and deodorizing material. The liquid water transfer rate reflects the material's ability to move liquid water outward within its plane; a higher value indicates a greater rapid absorption capacity. The results are shown in Table 2.

[0103] Take a patch sample material of 2cm long x 2cm wide x 2mm, dry it, add it to water, and weigh it at regular intervals (do 3 sets of experiments and take the average value). After the water absorption and swelling reach equilibrium, measure its liquid absorption performance according to the following formula.

[0104] W=(w1-w2) / w2

[0105] Wherein, W is the absorption multiple, g / g; w1 is the mass of the sample after absorption, g; w2 is the mass of the sample after drying, g.

[0106] Table 2

[0107]

[0108]

[0109] It can be seen from the above table that the antibacterial moisture-absorbing and deodorizing materials prepared in Examples 1-3 of the present invention have good moisture-absorbing and liquid-absorbing properties.

[0110] 3. Determination of air permeability of antibacterial materials

[0111] According to GB / T5453-1997 "Test method for air permeability of textile fabrics", the air permeability R (mm / s) of the patch sample material is tested using a fabric air permeability meter. The test area is 5cm 2 , the sample pressure difference is 100 Pa. The results are shown in Table 3.

[0112] Table 3

[0113] Group Air permeability (mm / s) Example 1 568 Example 2 570 Example 3 574 Comparative Example 1 555 Comparative Example 2 502 Comparative Example 3 537 Comparative Example 4 565 Comparative Example 5 564 Comparative Example 6 560

[0114] It can be seen from the above table that the antibacterial, moisture-absorbing and deodorizing materials prepared in Examples 1-3 of the present invention have good air permeability.

[0115] 4. In vitro cytotoxicity

[0116] The test was carried out according to ISO10993-5 standard test method. The results are shown in Table 4.

[0117] Table 4

[0118] Group Cytotoxicity (grade) Example 1 0 Example 2 0 Example 3 0 Comparative Example 1 0 Comparative Example 2 1 Comparative Example 3 1

[0119] It can be seen from the above table that the antibacterial, moisture-absorbing and deodorizing materials prepared in Examples 1-3 of the present invention are safe and non-toxic.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing an antibacterial, moisture-absorbing and deodorizing material, characterized in that: Bentonite was modified with a silane coupling agent with double bonds and then copolymerized with acrylic acid monomer to produce a bentonite / polyacrylic acid composite material. The composite was embedded in a calcium alginate layer, and the surface was condensed with silk fibroin peptides. The composite was then coated with an Ag-Cu / phytic acid layer to produce an antibacterial, moisture-absorbing and deodorizing material.

2. The preparation method according to claim 1, characterized in that The following steps are involved: S1. Preparation of modified bentonite: Bentonite was added to ethanol, a silane coupling agent having a double bond was added, the mixture was heated and stirred, the mixture was filtered, washed, and dried to obtain modified bentonite; S2. Preparation of bentonite / polyacrylic acid composite material: Modified bentonite, acrylic acid monomer and sodium bisulfite were added to water, heated with stirring, an initiator was added, the reaction was stirred, the pH of the solution was adjusted with sodium hydroxide, filtered, washed, dried, and ball milled to obtain a bentonite / polyacrylic acid composite material; S3. Encapsulation: Sodium alginate and an emulsifier are dissolved in water, and a bentonite / polyacrylic acid composite material is added and stirred to obtain an aqueous phase. The aqueous phase is added dropwise to the fish oil, emulsified, and a calcium salt solution is added dropwise. The mixture is cured at room temperature, filtered, washed, and dried to obtain encapsulated microspheres. S4. Silk fibroin peptide modification: The embedded microspheres were added to water, NHS and EDC were added, stirred for activation, silk fibroin peptide was added, stirred for reaction, filtered, washed, and freeze-dried to produce modified microspheres. S5. Ag-Cu / phytic acid coating: Add the modified microspheres to water, add phytic acid and dipotassium hydrogen phosphate, heat and stir to react, add silver nitrate and copper salt, stir to react, filter, wash, and dry to produce an antibacterial, moisture-absorbing, and deodorizing material.

3. The preparation method according to claim 2, characterized in that In step S1, the mass ratio of bentonite to the silane coupling agent with a double bond is 10:2-3, the temperature of the heating and stirring reaction is 45-55° C., and the time is 2-4 hours. The silane coupling agent with a double bond is selected from at least one of KH570, A151, and A171.

4. The preparation method according to claim 2, characterized in that In step S2, the mass ratio of the modified bentonite, acrylic acid monomer, sodium bisulfite and initiator is 7-12:17-22:0.2-0.3:0.01-0.02, the initiator is selected from at least one of sodium persulfate, potassium persulfate and ammonium persulfate, the acrylic acid monomer includes acrylic acid, methyl methacrylate and ethyl acrylate in a mass ratio of 3-5:2-4:4-6, the heating temperature is 65-75°C, the stirring reaction time is 3-5 hours, and the pH value of the solution is adjusted to 9-10.

5. The preparation method according to claim 2, characterized in that The emulsifier in step S3 is selected from at least one of Tween-20, Tween-40, Tween-60, Tween-80, and Tween-85, and the mass ratio of the sodium alginate, emulsifier, and bentonite / polyacrylic acid composite material is 15-20:0.5-1:8-12.

6. The preparation method according to claim 2, characterized in that In step S4, the mass ratio of the embedded microspheres, NHS, EDC and silk fibroin peptide is 10-12:1-2:1-2:3-5, and the stirring reaction time is 10-14 hours.

7. The preparation method according to claim 2, characterized in that In step S5, the mass ratio of the modified microspheres, phytic acid, dipotassium hydrogen phosphate, silver nitrate and copper salt is 10-12:3-5:0.2-0.3:0.1-0.2:0.15-0.2, the temperature of the heating and stirring reaction is 35-45° C., the time is 4-7 hours, the copper salt is selected from at least one of copper chloride, copper sulfate and copper nitrate, and the stirring reaction time is 0.5-1.5 hours.

8. An antibacterial, moisture-absorbing and deodorizing material prepared by the preparation method according to any one of claims 1 to 7.

9. Use of the antibacterial, moisture-absorbing and deodorizing material according to claim 8 in the preparation of disposable sanitary products.

10. A panty liner, characterized in that: It includes a skin-friendly surface layer, a middle layer and a bottom leak-proof layer. The middle layer is the antibacterial, moisture-absorbing and deodorizing material according to claim 8, with a filling thickness of 1-2 mm. The skin-friendly surface layer is a cotton layer, and the bottom leak-proof layer is a PET resin layer.

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