Antibacterial dry and comfortable liquid surface layer material for hygienic products and preparation method of antibacterial dry and comfortable liquid surface layer material

Abstract

The invention relates to the technical field of composite materials, in particular to an antibacterial dry and comfortable liquid surface layer material for hygienic products and a preparation method of the antibacterial dry and comfortable liquid surface layer material. The material comprises the following components in parts by mass: 18-22 parts of modified nano-zinc oxide, 52-56 parts of isobutyl acrylate, 6-10 parts of a cross-linking agent, 1.3-1.7 parts of an emulsifier, 2-4 parts of an initiator and 140-160 parts of water, and the material has an excellent antibacterial effect, is efficient and durable, and effectively improves the problem of poor antibacterial effect of a liquid fabric.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and in particular to an antibacterial and dry liquid surface material for hygiene products. Background Technology

[0002] In recent years, liquid surface materials have become increasingly popular in hygiene products. However, they have shortcomings in imparting specific functions to the materials and optimizing their performance, especially when used as skin-friendly layer materials.

[0003] For example, Chinese utility model patent application CN220069994U discloses a novel liquid-absorbent sanitary napkin, comprising a sanitary napkin body and side wings. The sanitary napkin body, from top to bottom, includes a surface layer, an absorbent core, and a bottom film. The absorbent core is composed of a liquid material layer, a non-woven fabric layer, and a composite absorbent paper layer. The side wings have a double-layer structure, with a water-repellent fabric on the upper layer and a bottom film on the lower layer, which are pressed and laminated together. The upper water-repellent fabric of both side wings extends towards the central sanitary napkin body, forming a water-repellent edge that covers the sanitary napkin body. This invention's non-woven fabric layer effectively strengthens the absorbent core, ensuring that the liquid material layer is not easily deformed or delaminated after absorbing liquid. The composite absorbent paper layer further enhances the liquid absorption capacity of the absorbent core and prevents liquid from seeping back onto the product surface after squeezing. However, it does not have antibacterial properties, making it prone to bacterial growth as a sanitary product, which is not conducive to use.

[0004] Therefore, existing technologies still need to be improved and developed to address the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an antibacterial and dry liquid surface material for hygiene products. This liquid surface material has excellent antibacterial effects, is highly effective and long-lasting, and effectively improves the problem of poor antibacterial performance of liquid fabrics.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention provides an antibacterial and dry liquid surface material for hygiene products, comprising the following components in parts by weight: 18-22 parts modified nano zinc oxide, 52-56 parts isobutyl acrylate, 6-10 parts crosslinking agent, 1.3-1.7 parts emulsifier, 2-4 parts initiator, and 140-160 parts water.

[0007] Based on the above scheme, the method for preparing modified nano zinc oxide is as follows: S1. After mixing ethanol and deionized water, add acetic acid dropwise to adjust the pH to 4-6 to obtain an ethanol-water solution; S2. While stirring at 400-600 rpm, slowly add the silane coupling agent to the ethanol aqueous solution prepared in step S1, and stir and hydrolyze at room temperature for 30-60 minutes to form a transparent silane hydrolysate. S3. While stirring at 600-800 rpm, add the dried nano zinc oxide to the ethanol aqueous solution prepared in step S1, and ultrasonically disperse it for 15-30 minutes at a power of 300-500 W to form a zinc oxide suspension. S4. While stirring at 600-800 rpm, slowly add the silane hydrolysate obtained in step S2 to the zinc oxide suspension in step S3 at a dropping rate of 5-10 mL / min. After the addition is complete, raise the temperature to 80-120℃ and react at a constant temperature for 2-4 hours. S5. After the reaction in step S4 is completed, cool to room temperature and collect the modified product by centrifugation or vacuum filtration; S6. Wash the modified product obtained in step S5 with the ethanol obtained in step 1 2-3 times to remove unreacted silane coupling agent and byproducts until the washing solution is neutral. S7. Place the filter cake obtained in step S6 in a vacuum drying oven and dry it at 60-80℃ for 4-6 hours. After drying, grind and sieve to obtain modified nano zinc oxide powder.

[0008] According to the above scheme, the ethanol content of the ethanol aqueous solution in step S1 is 85-93%.

[0009] According to the above scheme, the mass ratio of silane coupling agent to ethanol aqueous solution in step S2 is 1:10-1:15, and the mass ratio of nano zinc oxide to ethanol aqueous solution in step S3 is 1:16-1:20.

[0010] According to the above scheme, the volume ratio of silane hydrolysate to zinc oxide suspension in step S4 is 1:1 to 1:1.5.

[0011] According to the above scheme, the silane coupling agent is an acrylate-based silane coupling agent.

[0012] According to the above scheme, the emulsifier is one or more of glyceryl palmitate, glyceryl stearate, glyceryl oleate, glyceryl erucic acid, glyceryl laurate, palmitic acid, stearic acid, arachidic acid, and ligninic acid.

[0013] According to the above scheme, the initiator is any one of photoinitiator, persulfate initiator, and redox initiator.

[0014] According to the above scheme, the crosslinking agent is one or more of the following: divinylbenzene, trivinylbenzene, divinyltoluene, divinylxylene, ethylene glycol dimethacrylate, 1,4-butanediol dimethyl acrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, trimethylolpropane triisobutylacrylate, hexanediol dimethacrylate, 1,12-dodecyl dimethacrylate, and 1,14-tetradecyl diol dimethacrylate.

[0015] According to the above scheme, the preparation method of the antibacterial and dry liquid surface material for hygiene products includes the following steps: S1. Add the components to the reaction vessel according to the above mass proportions and stir to mix, thereby obtaining a mixed emulsion; S2. The emulsion obtained in step S1 is coated onto the surface of the nonwoven fabric with a coating thickness of 0.5 mm. Then, it is irradiated with light of wavelength 380-450 nm and intensity 50 mW / cm2 for 180 s, and then placed in a steam tunnel oven for curing for 5 min. After dehydration and drying, a roll sample is obtained. S3. The dried roll sample from step S2 is mechanically and precisely perforated to obtain an antibacterial and dry liquid surface layer for hygiene products.

[0016] The beneficial effects of this invention are as follows: (1) In this invention, modified zinc oxide nanoparticles are prepared by reacting zinc oxide nanoparticles with silane. The silane coupling agent is hydrolyzed to generate silanol, which then undergoes a condensation reaction with the hydroxyl groups on the surface of the zinc oxide nanoparticles to form stable Si-O-Zn chemical bonds. This process achieves organic coating on the surface of the zinc oxide nanoparticles, effectively improving its dispersion stability and compatibility in the mixed system. The zinc oxide nanoparticles are ultrasonically treated to expose more active sites in the ethanol medium, thereby significantly improving the antibacterial effect.

[0017] (2) The modified nano zinc oxide prepared by silane in this invention contains photoinitiating active groups, which synergistically enhance the active species generated by the initiator, significantly improving the polymerization reaction rate and curing adhesion, resulting in high production efficiency and long-lasting and effective antibacterial effect of the obtained liquid surface material.

[0018] (3) The present invention uses a large number of tiny holes constructed by fine hole cutting process, which greatly improves the liquid infiltration speed, can achieve instant absorption, and keep dry and antibacterial. Detailed Implementation

[0019] To better understand the present invention, the following embodiments further illustrate the content of the present invention, but the present invention is not limited to the following embodiments. Example 1:

[0020] This embodiment provides an antibacterial and dry liquid surface material for hygiene products, comprising the following components in parts by weight: 18 parts modified nano zinc oxide, 52 parts isobutyl acrylate, 6 parts divinylbenzene, 1.3 parts glyceryl palmitate, 2 parts methyl benzoate, and 140 parts water.

[0021] Furthermore, the preparation method of the modified nano zinc oxide is as follows: S1. After stirring and mixing ethanol and deionized water, acetic acid is added dropwise to adjust the pH to 4, thus obtaining an 85% ethanol aqueous solution; S2. Under stirring at 400 rpm, methacryloyloxypropyltrimethoxysilane is slowly added to the ethanol aqueous solution prepared in step S1 at a mass ratio of 1:10. The mixture is stirred and hydrolyzed at room temperature for 45 minutes to form a transparent silane hydrolysate. S3. While stirring at 600 rpm, add the dried nano zinc oxide to the ethanol aqueous solution prepared in step S1 at a mass ratio of 1:16 between nano zinc oxide and ethanol aqueous solution, and ultrasonically disperse at 300 W for 15 minutes to form a zinc oxide suspension. S4. Under stirring at 600 rpm, the silane hydrolysate obtained in step S2 is slowly added dropwise to the zinc oxide suspension in step S3 at a volume ratio of 1:1 between the silane hydrolysate and the zinc oxide suspension. The dropwise rate is 5 mL / min. After the addition is complete, the temperature is raised to 80℃ and the reaction is carried out at a constant temperature for 4 hours. S5. After the reaction in step S4 is completed, cool to room temperature, centrifuge at 6000 rpm for 10 min, and collect the modified product; S6. Wash the modified product obtained in step S5 with the ethanol obtained in step 1 2-3 times to remove unreacted silane coupling agent and byproducts until the washing solution is neutral. S7. Place the filter cake obtained in step S6 in a vacuum drying oven and dry it at 60°C for 6 hours. After drying, grind and sieve to obtain modified nano zinc oxide powder.

[0022] Furthermore, the preparation method of the aforementioned antibacterial and dry liquid surface material for hygiene products includes the following steps: S1. Add the components to the reaction vessel according to the above mass proportions and stir to mix, thereby obtaining a mixed emulsion; S2. The emulsion obtained in step S1 is coated onto the surface of the nonwoven fabric to a thickness of 0.5 mm. Then, it is irradiated with light at a wavelength of 380 nm and an intensity of 50 mW / cm2 for 180 s. After curing in a steam tunnel oven for 5 min, it is dehydrated and dried to obtain a roll sample. S3. Mechanically cut holes in the dried roll sample from step S2, with a hole diameter of 10µm, to obtain an antibacterial and dry liquid surface layer for hygiene products. Example 2:

[0023] This embodiment provides an antibacterial and dry liquid surface material for hygiene products, comprising the following components in parts by weight: 20 parts modified nano zinc oxide, 54 parts isobutyl acrylate, 8 parts divinyltoluene, 1.5 parts glyceryl laurate, 3 parts 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and 150 parts water.

[0024] Furthermore, the preparation method of the modified nano zinc oxide is as follows: S1. After stirring and mixing ethanol and deionized water, acetic acid is added dropwise to adjust the pH to 5, thus obtaining an 89% ethanol aqueous solution; S2. Under stirring at 500 rpm, the silane coupling agent is slowly added to the ethanol aqueous solution prepared in step S1 at a mass ratio of 1:12.5 of methacryloyloxypropyltrimethoxysilane and ethanol aqueous solution. The mixture is stirred and hydrolyzed at room temperature for 45 minutes to form a transparent silane hydrolysate. S3. While stirring at 700 rpm, add the dried nano zinc oxide to the ethanol aqueous solution prepared in step S1 at a mass ratio of 1:18 and ultrasonically disperse at 400 W for 23 minutes to form a zinc oxide suspension. S4. Under stirring at 700 rpm, the silane hydrolysate obtained in step S2 is slowly added dropwise to the zinc oxide suspension in step S3 at a volume ratio of 1:1.25 between the silane hydrolysate and the zinc oxide suspension. The dropwise rate is 7.5 mL / min. After the addition is complete, the temperature is raised to 100℃ and the reaction is carried out at a constant temperature for 3 hours. S5. After the reaction in step S4 is completed, cool to room temperature, centrifuge at 7000 rpm for 10 min, and collect the modified product; S6. Wash the modified product obtained in step S5 with the ethanol obtained in step 1 2-3 times to remove unreacted silane coupling agent and byproducts until the washing solution is neutral. S7. Place the filter cake obtained in step S6 in a vacuum drying oven and dry it at 70°C for 5 hours. After drying, grind and sieve to obtain modified nano zinc oxide powder.

[0025] Furthermore, the preparation method of the aforementioned antibacterial and dry liquid surface material for hygiene products includes the following steps: S1. Add the components to the reaction vessel according to the above mass proportions and stir to mix, thereby obtaining a mixed emulsion; S2. The emulsion obtained in step S1 is coated onto the surface of the nonwoven fabric to a thickness of 0.5 mm. Then, it is irradiated with light at a wavelength of 415 nm and an intensity of 50 mW / cm2 for 180 s, and then placed in a steam tunnel oven for curing for 5 min. After dehydration and drying, a roll sample is obtained. S3. Mechanically cut holes in the dried roll sample from step S2, with a hole diameter of 25µm, to obtain an antibacterial and dry liquid surface layer for hygiene products. Example 3:

[0026] This embodiment provides an antibacterial and dry liquid surface material for hygiene products, comprising the following components in parts by weight: 22 parts modified nano zinc oxide, 56 parts isobutyl acrylate, 10 parts hexanediol dimethacrylate, 1.7 parts stearic acid, 4 parts ammonium persulfate, and 160 parts water.

[0027] Furthermore, the preparation method of the modified nano zinc oxide is as follows: S1. After stirring and mixing ethanol and deionized water, acetic acid is added dropwise to adjust the pH to 6, thus obtaining a 93% ethanol aqueous solution; S2. Under stirring at 600 rpm, acryloyloxytriisopropylsilane is slowly added to the ethanol aqueous solution prepared in step S1 at a mass ratio of 1:15 between silane coupling agent and ethanol aqueous solution. The mixture is stirred and hydrolyzed at room temperature for 60 minutes to form a transparent silane hydrolysate. S3. While stirring at 800 rpm, add the dried nano zinc oxide to the ethanol aqueous solution prepared in step S1 at a mass ratio of 1:20 between nano zinc oxide and ethanol aqueous solution, and ultrasonically disperse at 500 W for 30 minutes to form a zinc oxide suspension. S4. Under stirring at 800 rpm, the silane hydrolysate obtained in step S2 is slowly added dropwise to the zinc oxide suspension in step S3 at a volume ratio of 1:1.5 of silane hydrolysate to zinc oxide suspension at a dropping rate of 10 mL / min. After the addition is complete, the temperature is raised to 120℃ and the reaction is carried out at a constant temperature for 2 hours. S5. After the reaction in step S4 is completed, cool to room temperature and collect the modified product by vacuum filtration; S6. Wash the modified product obtained in step S5 with the ethanol obtained in step 1 2-3 times to remove unreacted silane coupling agent and byproducts until the washing solution is neutral. S7. Place the filter cake obtained in step S6 in a vacuum drying oven and dry it at 80°C for 4 hours. After drying, grind and sieve to obtain modified nano zinc oxide powder.

[0028] Furthermore, the preparation method of the aforementioned antibacterial and dry liquid surface material for hygiene products includes the following steps: S1. Add the components to the reaction vessel according to the above mass proportions and stir to mix, thereby obtaining a mixed emulsion; S2. The emulsion obtained in step S1 is coated onto the surface of the nonwoven fabric to a thickness of 0.5 mm. Then, it is irradiated with light at a wavelength of 450 nm and an intensity of 50 mW / cm2 for 180 s, and then placed in a steam tunnel oven for curing for 5 min. After dehydration and drying, a roll sample is obtained. S3. Mechanically cut holes in the dried sample from step S2, with a hole diameter of 50µm, to obtain an antibacterial and dry liquid surface layer for hygiene products.

[0029] Comparative Example 1: The steps and process parameters are basically the same as in Example 2, except that modified nano zinc oxide is not prepared, and nano zinc oxide is used directly.

[0030] Comparative Example 2: The steps and process parameters are basically the same as in Example 2, except that the roll sample obtained in step S3 of the preparation method of antibacterial and dry liquid surface material for sanitary products is not perforated.

[0031] The liquid surface materials prepared in Examples 1-3 and Comparative Example 2 were subjected to physical property tests on their thermal sensitivity, absorption rate, and reverse osmosis value. The test methods and test data are as follows: 1) Antibacterial test: The product was tested for antibacterial performance against Staphylococcus aureus, Escherichia coli, and Candida albicans according to the test methods in GB 15979-2002 "Hygienic Standard for Disposable Sanitary Products". 2) Absorption rate test: Use a pipette to draw 5 ml of test liquid and inject it into the center of the test sample, and start timing at the same time to record the time it takes for the liquid to disappear; Table 1

[0032] As can be seen from the above, the antibacterial and dry liquid surface material for hygiene products prepared by this method has excellent antibacterial properties and absorption speed. A comparison of Examples 1-3 with Comparative Example 1 shows that the antibacterial rate of the liquid surface material prepared using modified nano-zinc oxide is significantly higher than that prepared using nano-zinc oxide. The antibacterial rate against Staphylococcus aureus is increased by 2.93%, against Escherichia coli by 2.14%, and against Candida albicans by 2.4%, demonstrating a significant improvement in antibacterial effect. A comparison of Examples 1-3 with Comparative Example 2 shows that the product with fine perforation treatment has an absorption speed that is up to 8 seconds faster than the product without fine perforation treatment, achieving instant absorption and maintaining dryness and antibacterial properties.

[0033] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A type of antibacterial and dry liquid surface material for hygiene products, characterized in that, The components include the following parts by weight: 18-22 parts modified nano zinc oxide, 52-56 parts isobutyl acrylate, 6-10 parts crosslinking agent, 1.3-1.7 parts emulsifier, 2-4 parts initiator, and 140-160 parts water.

2. The antibacterial and dry liquid surface material for hygiene products according to claim 1, characterized in that, The method for preparing the modified nano zinc oxide is as follows: S1. After mixing ethanol and deionized water, add acetic acid dropwise to adjust the pH to 4-6 to obtain an ethanol-water solution; S2. While stirring at 400-600 rpm, slowly add the silane coupling agent to the ethanol aqueous solution prepared in step S1, and stir and hydrolyze at room temperature for 30-60 minutes to form a transparent silane hydrolysate. S3. While stirring at 600-800 rpm, add the dried nano zinc oxide to the ethanol aqueous solution prepared in step S1, and ultrasonically disperse it for 15-30 minutes at a power of 300-500 W to form a zinc oxide suspension. S4. While stirring at 600-800 rpm, slowly add the silane hydrolysate obtained in step S2 to the zinc oxide suspension in step S3 at a dropping rate of 5-10 mL / min. After the addition is complete, raise the temperature to 80-120℃ and react at a constant temperature for 2-4 hours. S5. After the reaction in step S4 is completed, cool to room temperature and collect the modified product by centrifugation or vacuum filtration; S6. Wash the modified product obtained in step S5 with the ethanol obtained in step 1 2-3 times to remove unreacted silane coupling agent and byproducts until the washing solution is neutral. S7. Place the filter cake obtained in step S6 in a vacuum drying oven and dry it at 60-80℃ for 4-6 hours. After drying, grind and sieve to obtain modified nano zinc oxide powder.

3. The antibacterial and dry liquid surface material for hygiene products according to claim 2, characterized in that, The ethanol content of the aqueous ethanol solution in step S1 is 85-93%.

4. The antibacterial and dry liquid surface material for hygiene products according to claim 2, characterized in that, In step S2, the mass ratio of silane coupling agent to ethanol aqueous solution is 1:10-1:15, and in step S3, the mass ratio of nano zinc oxide to ethanol aqueous solution is 1:16-1:

20.

5. The antibacterial and dry liquid surface material for hygiene products according to claim 2, characterized in that, In step S4, the volume ratio of silane hydrolysate to zinc oxide suspension is 1:1 to 1:1.

5.

6. The antibacterial and dry liquid surface material for hygiene products according to claim 1, characterized in that, The silane coupling agent is an acrylate-based silane coupling agent.

7. The antibacterial and dry liquid surface material for hygiene products according to claim 1, characterized in that, The emulsifier is one or more of glyceryl palmitate, glyceryl stearate, glyceryl oleate, glyceryl erucic acid, glyceryl laurate, palmitic acid, stearic acid, arachidic acid, and ligninic acid.

8. The antibacterial and dry liquid surface material for hygiene products according to claim 1, characterized in that, The initiator is any one of photoinitiators, persulfate initiators, and redox initiators.

9. The antibacterial and dry liquid surface material for hygiene products according to claim 1, characterized in that, The crosslinking agent is one or more of the following: divinylbenzene, trivinylbenzene, divinyltoluene, divinylxylene, ethylene glycol dimethacrylate, 1,4-butanediol dimethyl acrylate, 1,6-hexanediol diacrylate, trimethylolpropane triacrylate, trimethylolpropane triisobutylacrylate, hexanediol dimethacrylate, 1,12-dodecyl dimethacrylate, and 1,14-tetradecyl diol dimethacrylate.

10. The method for preparing the antibacterial and dry liquid surface material for hygiene products according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Add the components to the reaction vessel according to the above mass proportions and stir to mix, thereby obtaining a mixed emulsion; S2. The mixed emulsion obtained in step S1 is coated onto the surface of the nonwoven fabric with a coating thickness of 0.5 mm. Then, it is irradiated with light of wavelength 380-450 nm and intensity 50 mW / cm2 for 180 s, and then placed in a steam tunnel oven for curing for 5 min. After dehydration and drying, a roll sample is obtained. S3. The dried roll sample from step S2 is mechanically and precisely perforated to obtain an antibacterial and dry liquid surface layer for hygiene products.

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