Deodorizing and antibacterial multifunctional non-woven fabric and preparation method therefor

Abstract

The present application relates to the technical field of non-woven fabrics, and specifically discloses a deodorizing and antibacterial multifunctional non-woven fabric and a preparation method therefor. The deodorizing and antibacterial multifunctional non-woven fabric comprises the following components in parts by weight: 100-120 parts of a polymer, 2-4 parts of an antibacterial agent, and 4-6 parts of modified polyethylene, wherein the modified polyethylene is prepared by means of a reverse suspension method with a mixture of double-bond-containing polyvinyl alcohol, dopamine, sunflower stem piths, an initiator, glutaraldehyde and water as a water phase and a mixture of liquid paraffin and Span 80 as an oil phase. The deodorizing and antibacterial multifunctional non-woven fabric of the present application has the advantages of an antibacterial rate of up to 96% or more, a deodorization rate of up to 98.7% or more, and significant antibacterial and deodorizing effects.

Description

Deodorizing and antibacterial multifunctional non-woven fabric and preparation method thereof Technical Field

[0001] The present application relates to the technical field of non-woven fabrics, and more specifically, to a deodorizing and antibacterial multifunctional non-woven fabric and a preparation method thereof. Background Art

[0002] Antimicrobial nonwoven fabrics are made by loading antimicrobial agents onto nonwoven fabrics. Leveraging the inherent properties of the antimicrobial agents, these fabrics inhibit bacterial growth. These fabrics are widely used in a wide range of applications, including masks, filter media, and ostomy bags.

[0003] With the advancement of technology, antibacterial non-woven fabrics are increasingly required to have a certain degree of deodorizing effect. For example, non-woven fabrics are impregnated with activated carbon slurry, which adheres to the surface. The activated carbon's excellent adsorption properties absorb odorous substances, thereby reducing the concentration of odorous substances in the air and achieving deodorization. Odor-causing substances are mainly ammonia, acetic acid, isovaleric acid, hydrogen sulfide, etc. Currently, deodorization effectiveness tests mainly focus on ammonia. Tests have shown that when the activated carbon slurry concentrations are 2.0wt%, 3.8wt%, and 5.3wt%, the deodorization rates for ammonia are 82.5%, 84.1%, and 94.8%, respectively.

[0004] The deodorizing performance of the non-woven fabric increases with the increase of the activated carbon slurry concentration, but its porosity will decrease accordingly, resulting in a decrease in the comfort of the material. Therefore, it is impossible to improve the deodorizing performance of the non-woven fabric by continuously increasing the activated carbon concentration. The deodorizing rate of ammonia is as high as 94.8%, which still needs to be further improved.

[0005] Summary of the Invention

[0006] In order to improve the deodorizing effect of antibacterial non-woven fabrics, the present application provides a deodorizing and antibacterial multifunctional non-woven fabric and a preparation method thereof.

[0007] In the first aspect, the present application provides a deodorizing and antibacterial multifunctional non-woven fabric, which adopts the following technical solution:

[0008] A deodorizing and antibacterial multifunctional non-woven fabric comprises the following components in parts by weight:

[0009] 100-120 parts of polymer;

[0010] 2-4 parts of antibacterial agent;

[0011] 4-6 parts of modified polyethylene:

[0012] The modified polyethylene is prepared by a reverse suspension method using a mixture of double-bond polyvinyl alcohol, dopamine, sunflower stem pith, initiator, glutaraldehyde and water as the aqueous phase and a mixture of liquid paraffin and Span80 as the oil phase.

[0013] By adopting the above technical solution: the antibacterial performance test shows that the antibacterial rate of the non-woven fabric is over 96%, showing a significant antibacterial effect; the deodorization performance test shows that when the non-woven fabric contains modified polyethylene, the ammonia concentration reduction rate is over 98.7%, which is significantly better than the 37.2% of the non-woven fabric containing commercial polyethylene and the 90.7% of the non-woven fabric containing activated carbon. The modified polyethylene significantly improves the deodorization performance of the non-woven fabric. Analysis shows that the reasons may be:

[0014] Polyvinyl alcohol (PVA) containing double bonds undergoes free radical polymerization. Dopamine, a positively charged monomer, is polymerized with the double bonds through a reverse suspension method to produce a positively charged modified polyethylene. Ammonia, with its negatively charged nitrogen atoms due to its lone pair of electrons, forms a hydrogen bond with the modified polyethylene, achieving a strong deodorizing effect. The addition of sunflower stem pith, leveraging its porous structure, enhances the adsorption capacity of the modified polyethylene, achieving both adsorption and neutralization.

[0015] When dopamine was used alone, the ammonia concentration reduction rate dropped to 93.6%. When sunflower pith was used alone, the reduction rate was only 39.5% (similar to when no dopamine or sunflower pith was added), which was significantly lower than when the two were used together. This shows that dopamine and sunflower pith in modified polyethylene work synergistically to achieve strong deodorization.

[0016] Optionally, the preparation method of the modified polyethylene is:

[0017] Add polyvinyl alcohol containing double bonds, dopamine, sunflower stem pith, and initiator A to water and mix to obtain an aqueous phase; add Span 80 to liquid paraffin and mix to obtain an oil phase; after nitrogen purging the oil phase, add the aqueous phase dropwise while maintaining a nitrogen atmosphere and stirring; raise the temperature to 40-60°C, add initiator B dropwise, react, remove the filtrate by suction, wash, and dry to obtain the product;

[0018] The initiator A is potassium persulfate or ammonium persulfate;

[0019] The initiator B is an aqueous solution of N,N,N',N'-tetramethylethylenediamine.

[0020] By adopting the above technical solution: the process is simple and efficient, which is conducive to the industrial large-scale preparation of modified polyethylene, and the prepared modified polyethylene has a strong deodorizing effect.

[0021] Optionally, in the aqueous phase, the weight ratio of polyvinyl alcohol containing double bonds, dopamine, and sunflower stem pith is 1:(0.3-0.5):(0.1-0.2).

[0022] By adopting the above technical solution: when the added amounts of dopamine and sunflower stem pith are within the above ranges, the concentrations are appropriate and the performance of the prepared modified polyethylene is better.

[0023] Optionally, in the aqueous phase, the double-bond-containing polyvinyl alcohol is obtained by reacting a polyvinyl alcohol aqueous solution and a propylene bromide solution under the catalysis of a base.

[0024] By adopting the above technical solution: polyvinyl alcohol and propylene bromide react to introduce double bonds into the polyvinyl alcohol, free radical polymerization can be achieved to prepare modified polyethylene. At the same time, the process is relatively simple and convenient.

[0025] Optionally, the weight ratio of propylene bromide to polyvinyl alcohol is (0.5-0.6):1.

[0026] Optionally, in the oil phase, the weight ratio of liquid paraffin to Span80 is 1:(0.02-0.03).

[0027] Optionally, the volume ratio of the oil phase to the water phase is (3-8):1.

[0028] By adopting the above technical solution, the water phase is evenly dispersed in the oil phase, the polyvinyl alcohol containing double bonds can be well dispersed in the oil phase, and the polymerization effect is good.

[0029] Optionally, the polymer is one or more of polypropylene, ethylene-propylene copolymer, metallocene linear low-density polyethylene, chitosan, and ethylene-vinyl acetate copolymer.

[0030] Optionally, the polymer includes the following components in parts by weight:

[0031] Polypropylene 75-85 parts;

[0032] 6-8 parts of ethylene-propylene copolymer;

[0033] 13-18 parts of metallocene linear low-density polyethylene;

[0034] 3-5 parts of chitosan;

[0035] 3-5 parts of ethylene-vinyl acetate copolymer.

[0036] In a second aspect, the present application provides a method for preparing a deodorizing and antibacterial multifunctional non-woven fabric, which adopts the following technical solution:

[0037] A method for preparing a deodorizing and antibacterial multifunctional non-woven fabric comprises the following steps:

[0038] The polymer, antibacterial agent and modified polyethylene are mixed evenly, melted, spun, carded into a web, and reinforced with hot air to obtain the product.

[0039] By adopting the above technical solution: the process is simple and efficient, which is conducive to the large-scale preparation of non-woven fabrics, and the antibacterial rate of the non-woven fabrics can reach more than 96%, and the deodorization rate is as high as more than 98.7%. It has extremely strong antibacterial and deodorizing effects and can meet higher usage requirements and different application environments.

[0040] In summary, this application has the following beneficial effects:

[0041] 1. In this application, polyvinyl alcohol containing double bonds is polymerized with the positively charged monomer dopamine to produce a positively charged modified polyethylene, which undergoes hydrogen bonding with ammonia to achieve deodorization. At the same time, sunflower stem pith with a porous structure is further introduced to improve adsorption performance. The sunflower stem pith and dopamine work synergistically to produce a modified polyethylene that simultaneously achieves adsorption, neutralization and deodorization, significantly improving the deodorization performance of the non-woven fabric.

[0042] 2. In this application, polyvinyl alcohol and propylene bromide are used under the catalysis of base to prepare polyethylene containing double bonds to achieve free radical polymerization. The process conditions are mild, simple and efficient, which is conducive to the large-scale preparation of modified polyethylene. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG1 is an overall view of the deodorizing and antibacterial multifunctional non-woven fabric in Example 1 of the present application. DETAILED DESCRIPTION

[0044] The present application is further described in detail below with reference to the examples. In the present application, the polyvinyl alcohol-water solution is obtained by dissolving polyvinyl alcohol in water, and the polyvinyl alcohol is obtained from Jinan Jinniu Chemical Co., Ltd., model PVA17-88; the propylene bromide-DMF solution is obtained by dissolving 3-propylene bromide in DMF; the N,N,N',N'-tetramethylethylenediamine solution is obtained by dissolving N,N,N',N'-tetramethylethylenediamine in water; dopamine hydrochloride is obtained from Jinan Hongshengdi New Materials Co., Ltd., brand HSD-DD202306; the sunflower stem pith is obtained from Bozhou Huozhengtang Pharmaceutical Co., Ltd. The product was ball-milled to 200 mesh before use; polypropylene was purchased from Boluoke (Hangzhou) New Materials Co., Ltd., with the brand name 2188; ethylene-propylene copolymer was purchased from DuPont, USA, with the model name FEP100; metallocene linear low-density polyethylene was purchased from Shenzhen Hansen Plastic Technology Co., Ltd., with the brand name 2607G; chitosan was purchased from Shaanxi Yuanyou Biotechnology Co., Ltd., with the model name yuanyou666; ethylene-vinyl acetate copolymer was purchased from Dongguan Jinsuwang New Materials Co., Ltd., with the brand name UE630; and silver ion antibacterial agent was purchased from Wuxi Yuda Fine Chemical Co., Ltd., with the model name AWD-15SG.

[0045] Preparation Example 1

[0046] A modified polyethylene is prepared by the following steps:

[0047] S1. Preparation of polyvinyl alcohol containing double bonds: To 6 kg of a 20 wt % polyvinyl alcohol-water solution, 1.5 kg of a 40 wt % propylene bromide-DMF solution was added dropwise, and 100 mL of a 10 mol / L NaOH solution was added dropwise. The temperature was raised to 50° C. and the reaction was carried out for 18 hours to obtain a reaction solution. The reaction solution was washed with 10 L of anhydrous ethanol, the filtrate was removed by filtration, and the reaction solution was then washed with 10 L of 95% by volume ethanol, and the filtrate was removed by filtration to obtain polyvinyl alcohol containing double bonds.

[0048] S2. To 5000 mL of water, 250 g of polyvinyl alcohol containing double bonds, 70 g of dopamine hydrochloride, 20 g of sunflower stem pith, 3 g of initiator A (potassium persulfate), and 1.5 g of glutaraldehyde were added, and the mixture was conventionally mixed to obtain an aqueous phase; 0.02 kg of Span80 was added to 1 kg of liquid paraffin, and the mixture was conventionally mixed to obtain an oil phase;

[0049] 1L of oil phase was purged with nitrogen for 20 min, and the nitrogen atmosphere was maintained. The aqueous phase was added dropwise at a stirring speed of 300 r / min (the volume ratio of the aqueous phase to the oil phase was 1:3, and it was slowly added within 20 min). The temperature was raised to 40°C, and 5mL of initiator B (a 20wt% N,N,N',N'-tetramethylethylenediamine solution) was added dropwise. The reaction was allowed to proceed for 6 h. The filtrate was removed by suction, and the filtered product was washed with 1L of petroleum ether and dried at 30°C for 1 h.

[0050] Preparation Example 2

[0051] A modified polyethylene is prepared by the following steps:

[0052] S1. Preparation of polyvinyl alcohol containing double bonds: To 6 kg of a 20 wt % polyvinyl alcohol-water solution, 1.65 kg of a 40 wt % propylene bromide-DMF solution was added dropwise, and 100 mL of a 10 mol / L NaOH solution was added dropwise. The temperature was raised to 50° C. and the reaction was carried out for 18 hours to obtain a reaction solution. The reaction solution was washed with 10 L of anhydrous ethanol, the filtrate was removed by filtration, and the reaction solution was then washed with 10 L of 95% ethanol by volume, and the filtrate was removed by filtration to obtain polyvinyl alcohol containing double bonds.

[0053] S2. To 5000 mL of water, 250 g of polyvinyl alcohol containing double bonds, 70 g of dopamine hydrochloride, 20 g of sunflower stem pith, 3 g of initiator A (potassium persulfate), and 1.5 g of glutaraldehyde were added, and the mixture was conventionally mixed to obtain an aqueous phase; 0.025 kg of Span80 was added to 1 kg of liquid paraffin, and the mixture was conventionally mixed to obtain an oil phase;

[0054] 1L of oil phase was purged with nitrogen for 20 min, and the nitrogen atmosphere was maintained. The aqueous phase was added dropwise at a stirring speed of 300 r / min (the volume ratio of the aqueous phase to the oil phase was 1:5, and it was slowly added within 20 min). The temperature was raised to 50°C, and 5mL of initiator B (a 20wt% N,N,N',N'-tetramethylethylenediamine solution) was added dropwise. The reaction was allowed to proceed for 6 h. The filtrate was removed by suction, and the filtered product was washed with 1L of petroleum ether and dried at 30°C for 1 h.

[0055] Preparation Example 3

[0056] A modified polyethylene is prepared by the following steps:

[0057] S1. Preparation of polyvinyl alcohol containing double bonds: To 6 kg of a 20 wt % polyvinyl alcohol-water solution, 1.8 kg of a 40 wt % propylene bromide-DMF solution was added dropwise, and 100 mL of a 10 mol / L NaOH solution was added dropwise. The temperature was raised to 50° C. and the reaction was carried out for 18 hours to obtain a reaction solution. The reaction solution was washed with 10 L of anhydrous ethanol, the filtrate was removed by filtration, and the reaction solution was then washed with 10 L of 95% by volume ethanol, and the filtrate was removed by filtration to obtain polyvinyl alcohol containing double bonds.

[0058] S2. To 5000 mL of water, 250 g of polyvinyl alcohol containing double bonds, 70 g of dopamine hydrochloride, 20 g of sunflower stem pith, 3 g of initiator A (potassium persulfate), and 1.5 g of glutaraldehyde were added, and the mixture was conventionally mixed to obtain an aqueous phase; 0.03 kg of Span80 was added to 1 kg of liquid paraffin, and the mixture was conventionally mixed to obtain an oil phase;

[0059] 1L of oil phase was purged with nitrogen for 20 min, and the nitrogen atmosphere was maintained. The aqueous phase was added dropwise at a stirring speed of 300 r / min (the volume ratio of the aqueous phase to the oil phase was 1:8, and it was slowly added within 20 min). The temperature was raised to 60°C, and 5mL of initiator B (a 20wt% N,N,N',N'-tetramethylethylenediamine solution) was added dropwise. The reaction was allowed to proceed for 6h. The filtrate was removed by suction, and the filtered product was washed with 1L of petroleum ether and dried at 30°C for 1h.

[0060] Preparation Examples 4-6

[0061] A modified polyethylene is different from Preparation Example 2 in that the amounts of dopamine hydrochloride and sunflower stem pith added to the aqueous phase in step S2 are different, as follows:

[0062] Preparation Example 4: The weight ratio of polyvinyl alcohol containing double bonds, dopamine hydrochloride, and sunflower stem pith is 1:0.3:0.1.

[0063] Preparation Example 5: The weight ratio of polyvinyl alcohol containing double bonds, dopamine hydrochloride, and sunflower stem pith is 1:0.4:0.15.

[0064] Preparation Example 6: The weight ratio of polyvinyl alcohol containing double bonds, dopamine hydrochloride, and sunflower stem pith is 1:0.5:0.2.

[0065] Examples 1-5, Comparative Examples 1-2

[0066] A deodorizing and antibacterial multifunctional non-woven fabric, the components and their corresponding weights of which are shown in Table 1, is prepared by the following steps:

[0067] The polymer, silver ion antibacterial agent, modified polyethylene (prepared by Preparation Example 1), antioxidant 1010, and anti-ultraviolet absorber UV-2908 are mixed, added to a screw extruder for melting, introduced into a spinning machine and ejected from a spinneret to form filaments, which are then cooled by air blowing, glycerol is added, and stretched and wound to obtain fibers; the fibers are combed into a web and reinforced by a hot air process to obtain the product.

[0068] Table 1 Components and their weights (kg) in Examples 1-5 and Comparative Examples 1-2

[0069] Comparative Example 3

[0070] A deodorizing and antibacterial multifunctional non-woven fabric is different from Example 1 in that an equal amount of polyethylene is used instead of modified polyethylene.

[0071] Polyethylene was sourced from the Zhangmutou Hailan Plastic Processing Factory in Dongguan City, with the brand name MG70.

[0072] Comparative Example 4

[0073] A deodorizing and antibacterial multifunctional non-woven fabric is provided, which differs from Example 1 in that an equal amount of activated carbon is used instead of modified polyethylene.

[0074] Comparative Example 5

[0075] A deodorizing and antibacterial multifunctional non-woven fabric is provided, which differs from Example 1 in that sunflower pith is not added during the preparation of the modified polyethylene, and an equal amount of dopamine hydrochloride is used instead of the sunflower pith.

[0076] Comparative Example 6

[0077] A deodorizing and antibacterial multifunctional non-woven fabric is provided, which differs from Example 1 in that dopamine hydrochloride is not added during the preparation of the modified polyethylene, and an equal amount of sunflower stem pith is used instead of dopamine hydrochloride.

[0078] Examples 6-10

[0079] A deodorizing and antibacterial multifunctional non-woven fabric is different from Example 2 in that the usage of the modified polyethylene is as shown in Table 2, but the amount of the modified polyethylene in the non-woven fabric remains unchanged.

[0080] Table 2 Usage of modified polyethylene in Examples 6-10

[0081] Performance testing

[0082] The nonwoven fabrics prepared in the examples and comparative examples were subjected to the following performance tests, and the test results are recorded in Table 3.

[0083] Detection method

[0084] 1. Antibacterial performance: Test according to GB / T 15979-2002 and record the antibacterial rate;

[0085] Test time: 20 minutes;

[0086] Test strain: Escherichia coli 8099 (the average colony count of the control sample was 2.0×10 4 ), Staphylococcus aureus ATCC 6538 (the average colony count of the control sample was 1.8×10 4 ), Candida albicans ATCC 10231 (the average colony count of the control sample was 2.9×10 4 ).

[0087] 2. Deodorization performance: Test according to GB / T 33610.2-2017 and record the reduction rate of ammonia concentration.

[0088] Table 3 Performance test results

[0089] As shown in Table 4, in Example 1, due to the use of the modified polyethylene prepared in Preparation Example 1, the ammonia concentration reduction rate of the non-woven fabric was as high as 98.7%; while in Comparative Example 3, commercially available polyethylene was used instead of the modified polyethylene, and the c of the non-woven fabric was only 37.2%, which did not have a significant deodorizing effect; Comparative Example 4 used activated carbon instead of the modified polyethylene, and the ammonia concentration reduction rate was 90.7%, which was significantly lower than that of Example 1; this shows that the modified polyethylene significantly improves the deodorizing performance of the non-woven fabric, and the reason for this may be:

[0090] Polyvinyl alcohol containing double bonds is polymerized with dopamine to produce modified polyethylene with a positive charge. The modified polyethylene combines with negatively charged nitrogen atoms to form hydrogen bonds and neutralize them, achieving a strong deodorizing effect. At the same time, the sunflower stem pith gives the modified polyethylene certain adsorption properties, allowing the modified polyethylene to achieve adsorption, neutralization and deodorization at the same time, thereby enhancing the deodorizing effect.

[0091] When only dopamine hydrochloride was used in Comparative Example 5, the ammonia concentration reduction rate dropped to 93.6%, and when only sunflower stem pith was used in Comparative Example 6, the ammonia concentration reduction rate was only 39.5%. Compared with Example 1, it can be seen that the combined effect of the two is significantly better than using dopamine or sunflower stem pith alone, and synergistically enhances the deodorizing performance of the non-woven fabric.

[0092] The difference between Examples 6 and 7 and Example 2 is that the performance of the non-woven fabrics does not change much by slightly adjusting the amount of each component in the modified polyethylene, and both are excellent.

[0093] The difference between Examples 8-10 and Example 6 is that the amount of dopamine hydrochloride and sunflower stem pith in the modified polyethylene increases gradually, the ammonia concentration reduction rate is 99.5-99.7%, and the deodorizing effect of the non-woven fabric is further enhanced.

[0094] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A deodorizing and antibacterial multifunctional nonwoven fabric, characterized in that: The composition comprises the following components in parts by weight: 100-120 parts of polymer; 2-4 parts of antibacterial agent; 4-6 parts of modified polyethylene; The modified polyethylene is prepared by a reverse suspension method, with a mixture of double-bond polyvinyl alcohol, dopamine, sunflower stem pith, initiator, glutaraldehyde and water as the water phase and a mixture of liquid paraffin and Span80 as the oil phase.

2. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 1, characterized in that: The preparation method of modified polyethylene is: Adding polyvinyl alcohol containing double bonds, dopamine, sunflower stem pith, and initiator A to water, and mixing to obtain a water phase; adding Span80 to liquid paraffin, and mixing to obtain an oil phase; After nitrogen is purged through the oil phase, the water phase is added dropwise under stirring while maintaining the nitrogen atmosphere, the temperature is raised to 40-60°C, initiator B is added dropwise, the reaction is carried out, the filtrate is removed by suction, the filtrate is washed, and the product is dried; Initiator A is potassium persulfate or ammonium persulfate; Initiator B is an aqueous solution of N,N,N',N'-tetramethylethylenediamine.

3. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 2, characterized in that: In the water phase, the weight ratio of polyvinyl alcohol containing double bonds, dopamine and sunflower stem pith is 1:(0.3-0.5):(0.1-0.2).

4. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 2, characterized in that: In the water phase, the polyvinyl alcohol containing double bonds is obtained by reacting the polyvinyl alcohol aqueous solution and the propylene bromide solution under the catalysis of a base.

5. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 4, characterized in that: The weight ratio of propylene bromide to polyvinyl alcohol is (0.5-0.6):

1.

6. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 1, characterized in that: In the oil phase, the weight ratio of liquid paraffin to Span80 is 1:(0.02-0.03).

7. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 1, characterized in that: The volume ratio of oil phase to water phase is (3-8):

1.

8. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 1, characterized in that: The polymer is one or more of polypropylene, ethylene-propylene copolymer, metallocene linear low-density polyethylene, chitosan, and ethylene-vinyl acetate copolymer.

9. The deodorizing and antibacterial multifunctional nonwoven fabric according to claim 8, characterized in that: The polymer includes the following components in parts by weight: 3-5 parts of chitosan; Polypropylene 75-85 parts; 6-8 parts of ethylene-propylene copolymer; 3-5 parts of ethylene-vinyl acetate copolymer; 13-18 parts of metallocene linear low density polyethylene.

10. A method for preparing a deodorizing and antibacterial multifunctional nonwoven fabric according to any one of claims 1 to 9, characterized in that: The following steps are involved: The polymer, antibacterial agent and modified polyethylene are mixed, melted, spun, carded into a web, and reinforced with hot air to obtain the product.

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