A composition of a meltblown nonwoven fabric, the meltblown nonwoven fabric and a method for forming the same.

Abstract

This application relates to the technical field of meltblown nonwoven fabrics, specifically disclosing a composition of meltblown nonwoven fabric, the meltblown nonwoven fabric itself, and a method for forming the same. The meltblown nonwoven fabric comprises the following raw materials in parts by weight: 50-65 parts polypropylene fiber, 15-20 parts polyester fiber, 8-12 parts antibacterial fiber, 5-9 parts zinc oxide, 2-6 parts mannitol, and 3-5 parts zinc stearate. The method of formation is as follows: zinc oxide, mannitol, and zinc stearate are extruded and granulated, then melt-spun to obtain composite fibers. The polypropylene fiber, polyester fiber, antibacterial fiber, and composite fiber are then opened, carded, and cross-laid into a web. The web is then hydroentangled and dried to obtain a grey fabric. The grey fabric is immersed in an antibacterial solution, removed, and dried to obtain the meltblown nonwoven fabric. The meltblown nonwoven fabric of this application, through the synergistic effect between the raw materials, has the advantage of improving the antibacterial properties of the meltblown nonwoven fabric.

Description

Technical Field

[0001] This application relates to the field of meltblown nonwoven fabric technology, and in particular to a composition of meltblown nonwoven fabric, meltblown nonwoven fabric and a method for forming the same. Background Technology

[0002] Meltblown nonwoven fabric is a nonwoven material made of thermoplastic polymer fibers. It is produced by melting the polymer and extruding it through small nozzles to form a very fine fiber web. These fibers are then laid out in a random pattern and bonded together by heat, pressure or chemical treatment. The resulting material has a high filtration efficiency, making it widely used in applications such as air and liquid filtration, medical masks and protective clothing, industrial wiping cloths and insulation materials.

[0003] With economic development and the improvement of people's living standards, people's awareness of health care has gradually increased, and their requirements for hygiene and health environment have become higher and higher. At present, some non-woven fabrics are prone to pollution and bacterial growth after the weather gets hot or damp, which can easily harm human health. Therefore, how to improve the antibacterial properties of non-woven fabrics is a major problem that urgently needs to be solved. Summary of the Invention

[0004] To improve the antibacterial properties of nonwoven fabrics, this application provides a composition of meltblown nonwoven fabric, a meltblown nonwoven fabric, and a method for forming the same.

[0005] In a first aspect, this application provides a composition of meltblown nonwoven fabric and a meltblown nonwoven fabric, adopting the following technical solution:

[0006] A meltblown nonwoven fabric comprises the following raw materials in parts by weight: 50-65 parts polypropylene fiber, 15-20 parts polyester fiber, 8-12 parts antibacterial fiber, 5-9 parts zinc oxide, 2-6 parts mannitol, 3-5 parts zinc stearate, wherein the antibacterial fiber is obtained by melt spinning silver-loaded loquat pomace and PET chips.

[0007] The antibacterial fiber is prepared by the following method: silver-loaded loquat pomace is mixed evenly with PET chips, and melt-spun to obtain antibacterial fiber;

[0008] The weight ratio of the silver-loaded loquat pomace to PET slices is (0.4-0.6):1;

[0009] The silver-loaded loquat pomace was prepared using the following method:

[0010] A1: Loquat pomace is placed in an ethanol solution for extraction. The extraction is repeated, the filtrates are combined, the solvent is recovered, and an extract is obtained. The extract is then extracted to obtain loquat pomace extract.

[0011] A2: Add loquat pomace extract and silver nitrate to water, mix well, heat until brownish-yellow, stop heating, centrifuge, filter, and obtain silver-loaded loquat pomace;

[0012] The weight ratio of the loquat pomace extract to silver nitrate is 1:(0.8-1.2).

[0013] Furthermore, the silver-loaded loquat pomace is prepared using the following method:

[0014] A1: Place loquat pomace in an ethanol solution and extract. Repeat the extraction 3-5 times, combine the filtrates, recover the solvent, and obtain an extract. Extract the extract with ethyl acetate to obtain loquat pomace extract.

[0015] A2: Add loquat pomace extract and silver nitrate to water, mix well, heat to 70-90℃ until brownish-yellow color appears, stop heating, centrifuge, filter, and obtain silver-loaded loquat pomace;

[0016] The ethanol solution has a mass fraction of 95%, and the amount of ethanol solution added to each 1g loquat pomace is 3-5mL. The weight ratio of loquat pomace to ethyl acetate is 1:(2-4).

[0017] By adopting the above technical solution, the meltblown nonwoven fabric of this application improves the antibacterial rate of the nonwoven fabric against Escherichia coli, Staphylococcus aureus, and Streptococcus epidermidis through the synergistic effect between the raw materials. The antibacterial rate of Escherichia coli is 97.6-99.8%, the antibacterial rate of Staphylococcus aureus is 96.9-99.5%, and the antibacterial rate of Streptococcus epidermidis is 87.0-89.6%.

[0018] Polypropylene and polyester fibers are the main raw materials for nonwoven fabrics, enabling them to maintain good mechanical properties. The antibacterial fiber is made by blending silver-loaded loquat pomace with PET chips. The silver-loaded loquat pomace contains silver ions, which carry a positive charge and can be adsorbed onto bacteria by Coulomb attraction. These silver ions penetrate the cell wall and enter the cell membrane, reacting with the cell and damaging the cell membrane. The cell membrane is a crucial component for bacterial life activities; damage to the cell membrane disrupts the bacteria's intrinsic components, causing functional impairment and ultimately bacterial death, thus achieving the purpose of antibacterial action. Utilizing loquat pomace loaded with silver ions not only achieves waste utilization and saves production costs, but also, because loquat pomace contains a large amount of flavonoids, these components can damage bacterial cell walls and cell membranes, causing the release of intracellular components and disrupting membrane functions such as electron transport, nutrient absorption, nucleotide synthesis, and ATP activity, ultimately leading to cell death. The synergistic effect between silver ions and loquat pomace enhances antibacterial properties, thereby improving the antibacterial properties of the nonwoven fabric. Zinc oxide also has antibacterial effects; when combined with mannitol and zinc stearate, it can effectively lower the embrittlement temperature of the nonwoven fabric and significantly extend its service life.

[0019] First, loquat pomace extract was prepared. Then, silver-loaded loquat pomace was prepared using loquat pomace and silver nitrate. This allows for better loading of silver ions onto the pomace, and the synergistic effect of silver ions and loquat pomace enhances the antibacterial properties of the nonwoven fabric. Furthermore, the weight ratio of silver-loaded loquat pomace to PET chips was carefully controlled. Insufficient silver-loaded loquat pomace did not optimally improve the antibacterial properties of the nonwoven fabric; excessive silver-loaded loquat pomace negatively impacted the mechanical properties of the nonwoven fabric. Additionally, the amounts of silver nitrate and loquat pomace extract were also carefully controlled. Insufficient silver nitrate did not effectively enhance the antibacterial properties of the nonwoven fabric; excessive silver ions (i.e., too many silver ions) could lead to premature aging of the nonwoven fabric, thus affecting its mechanical properties. When the weight ratio of silver-loaded loquat pomace and PET chips, and the amounts of silver nitrate and loquat pomace extract are within the above range, not only can the nonwoven fabric maintain good mechanical properties, but it can also have better antibacterial properties.

[0020] Secondly, this application provides a method for forming meltblown nonwoven fabric, employing the following technical solution:

[0021] A method for forming meltblown nonwoven fabric includes the following steps:

[0022] S1: Zinc oxide, mannitol, and zinc stearate are extruded and granulated, then melt-spun to obtain composite fibers. Polypropylene fibers, polyester fibers, antibacterial fibers, and composite fibers are opened and combed separately, then cross-laid into a web. The laid fiber web is reinforced by hydroentangling and dried to obtain the greige fabric.

[0023] S2: Soak the raw fabric in the antibacterial solution, take it out, dry it, and obtain meltblown nonwoven fabric.

[0024] Furthermore, a method for forming meltblown nonwoven fabric includes the following steps:

[0025] S1: Zinc oxide, mannitol, and zinc stearate are extruded and granulated, then melt-spun to obtain composite fibers. Polypropylene fibers, polyester fibers, antibacterial fibers, and composite fibers are opened and combed separately, then cross-laid into a web. The laid fiber web is reinforced by hydroentangling and dried to obtain the greige fabric.

[0026] S2: Soak the raw fabric in the antibacterial solution for 1-3 hours, take it out, dry it, and obtain meltblown nonwoven fabric.

[0027] By adopting the above technical solution and using the above preparation method to prepare meltblown nonwoven fabric, the antibacterial fiber can first improve the antibacterial properties of the nonwoven fabric, and the antibacterial liquid further improves the antibacterial properties of the nonwoven fabric. This not only makes the nonwoven fabric itself have an antibacterial effect, but also makes the surface of the nonwoven fabric have an antibacterial effect, achieving a dual antibacterial effect and a better antibacterial effect.

[0028] Preferably, the antibacterial solution is prepared by the following method: zinc oxide is added to aloe vera extract, mixed evenly, and left to stand for a period of time to obtain the antibacterial solution.

[0029] Furthermore, the antibacterial solution is prepared by the following method: zinc oxide is placed in aloe vera extract, mixed evenly, and allowed to stand for 10-14 hours to obtain the antibacterial solution.

[0030] As a preferred option, the amount of zinc oxide added to each 1 mL of aloe vera extract is 0.5-1.5 g.

[0031] By employing the above technical solution, the zinc oxide in the antibacterial solution can release zinc ions. Zinc ions have redox properties; when they come into contact with cell membranes, they react, destroying the cell membrane structure and rendering it inactive, thus achieving the purpose of sterilization. Aloe vera extract contains cytokinins, which have strong biochemical activity and can directly kill bacteria. Utilizing the synergistic effect of zinc oxide and aloe vera extract can further enhance the antibacterial properties of the nonwoven fabric.

[0032] Preferably, the aloe vera extract is prepared by the following method: washing, drying, crushing, sieving, adding to an ethanol solution, heating, extracting for a period of time, filtering, collecting the filtrate, and obtaining the aloe vera extract.

[0033] Furthermore, the aloe vera extract is prepared by the following method: wash, dry, crush, pass through a 100-mesh sieve, add to an ethanol solution, heat to 40-60℃, extract for 1-3 hours, filter, collect the filtrate, and obtain the aloe vera extract.

[0034] The ethanol solution has a mass fraction of 80%, and the amount of ethanol solution added per 1g of aloe vera is 8-12mL.

[0035] By adopting the above technical solution and using the above preparation method to prepare aloe vera extract, the aloe vera extract can play a better role, thereby further improving the antibacterial properties of non-woven fabric.

[0036] Preferably, the fabric is pretreated with dopamine hydrochloride solution before being placed into the antibacterial solution.

[0037] Furthermore, the specific steps for pretreating the fabric with dopamine hydrochloride solution before immersing it in the antibacterial solution are as follows: add dopamine hydrochloride solution to tris(hydroxymethyl)aminomethane solution, mix evenly, adjust the pH value to 8.5-8.8 with hydrochloric acid solution, immerse the nonwoven fabric in the solution, soak for 20-24 hours, remove it, wash it with water, and dry it to obtain the pretreated fabric.

[0038] The concentration of the dopamine hydrochloride solution was 0.02 mol / L, the concentration of the tris(hydroxymethyl)aminomethane solution was 10 mmol / L, the mass fraction of the hydrochloric acid solution was 30%, and the volume ratio of the dopamine hydrochloride solution to the tris(hydroxymethyl)aminomethane solution was 1:1.

[0039] By adopting the above technical solution, after the fabric is pretreated, many dopamine particles remain on the surface of the fabric. Dopamine particles have strong adhesion. When the fabric is immersed in the antibacterial solution, they can firmly adhere to the flavonoids and zinc ions in the aloe vera extract, thereby further improving the antibacterial properties of the nonwoven fabric.

[0040] In summary, this application includes at least one of the following beneficial technical effects:

[0041] 1. Because this application uses silver-loaded loquat pomace and PET chips to produce antibacterial fibers, the synergistic effect between silver ions and loquat pomace can better improve the antibacterial properties of the nonwoven fabric, achieving an inhibition rate of 99.8% against Escherichia coli, 99.5% against Staphylococcus aureus, and 89.6% against Streptococcus albus.

[0042] 2. In this application, it is preferred to pretreat the fabric with dopamine hydrochloride solution after it is made into a greige fabric. This allows the nonwoven fabric to better adhere to the flavonoids and zinc ions in the aloe vera extract, thereby further improving the antibacterial properties of the nonwoven fabric. Detailed Implementation

[0043] The following provides a more detailed description of this application in conjunction with specific details.

[0044] raw material

[0045] All raw materials used in this application are commercially available.

[0046] PET chips have a melting point of 265-280℃.

[0047] Preparation Example

[0048] Preparation Example 1

[0049] A silver-loaded loquat pomace is prepared using the following method:

[0050] A1: Place 5 kg of loquat pomace into 20 L of 95% ethanol solution, extract, repeat extraction 5 times, combine the filtrates, recover the solvent, and obtain an extract. Extract the extract with 15 kg of ethyl acetate to obtain loquat pomace extract.

[0051] A2: Add 2kg of loquat pomace extract and 1.6kg of silver nitrate to water, mix well, heat to 80℃ until brownish-yellow color appears, stop heating, centrifuge, filter, and obtain silver-loaded loquat pomace.

[0052] Preparation Example 2

[0053] A silver-loaded loquat pomace differs from Preparation Example 1 in that the amount of silver nitrate added is different; in Preparation Example 2, the amount of silver nitrate added is 2 kg.

[0054] Preparation Example 3

[0055] A silver-loaded loquat pomace differs from Preparation Example 1 in that the amount of silver nitrate added is different; in Preparation Example 3, the amount of silver nitrate added is 2.4 kg.

[0056] Preparation Example 4

[0057] An antibacterial fiber, prepared by the following method:

[0058] 0.8 kg of silver-loaded loquat pomace prepared in Preparation Example 1 was mixed evenly with 2 kg of PET chips, and then melt-spun to obtain antibacterial fibers.

[0059] Preparation Example 5

[0060] An antibacterial fiber, which differs from Preparation Example 4 in that the source of the silver-loaded loquat pomace is different; the silver-loaded loquat pomace in Preparation Example 5 was prepared using Preparation Example 2.

[0061] Preparation Example 6

[0062] An antibacterial fiber, which differs from Preparation Example 4 in that the source of the silver-loaded loquat pomace is different; the silver-loaded loquat pomace in Preparation Example 6 was prepared using Preparation Example 3.

[0063] Preparation Example 7

[0064] An antibacterial fiber, which differs from Preparation Example 5 in that the amount of silver-loaded loquat pomace added is different; in Preparation Example 7, the amount of silver-loaded loquat pomace added is 1 kg.

[0065] Preparation Example 8

[0066] An antibacterial fiber, which differs from Preparation Example 5 in that the amount of silver-loaded loquat pomace added is different; in Preparation Example 8, the amount of silver-loaded loquat pomace added is 1.2 kg.

[0067] Preparation Example 9

[0068] An aloe vera extract, prepared by the following method:

[0069] Wash 5 kg of aloe vera, dry it, crush it, pass it through a 100-mesh sieve, add it to 50 L of 80% ethanol solution, heat it to 50℃, extract it for 2 hours, filter it, collect the filtrate, and obtain aloe vera extract.

[0070] Preparation Example 10

[0071] An antibacterial solution is prepared by the following method:

[0072] 2 kg of zinc oxide was added to 2 L of aloe vera extract prepared in Preparation Example 9, mixed evenly, and allowed to stand for 12 h to obtain an antibacterial solution. Example

[0073] Example 1

[0074] A meltblown nonwoven fabric, the raw material ratio of which is shown in Table 1;

[0075] A method for forming meltblown nonwoven fabric includes the following steps:

[0076] S1: Zinc oxide, mannitol, and zinc stearate are extruded and granulated, and melt-spun to obtain composite fibers. Polypropylene fibers, polyester fibers, antibacterial fibers prepared in Preparation Example 4, and composite fibers are opened, combed, and then cross-laid into a web. The laid fiber web is reinforced by hydroentangling and dried to obtain a grey fabric.

[0077] S2: Soak the greige fabric in the antibacterial solution prepared in Preparation Example 10 for 2 hours, take it out, dry it, and obtain meltblown nonwoven fabric.

[0078] Examples 2-5

[0079] A meltblown nonwoven fabric differs from Example 1 in that the raw material ratio of the meltblown nonwoven fabric is different, as shown in Table 1.

[0080]

[0081] Example 6

[0082] A meltblown nonwoven fabric differs from Example 4 in that the antibacterial fiber is from a different source; the antibacterial fiber in Example 6 was prepared using the method described in Preparation Example 5.

[0083] Example 7

[0084] A meltblown nonwoven fabric, which differs from Example 4 in that the antibacterial fiber is from a different source; the antibacterial fiber in Example 7 was prepared using Preparation Example 6.

[0085] Example 8

[0086] A meltblown nonwoven fabric, which differs from Example 4 in that the antibacterial fiber is from a different source; the antibacterial fiber in Example 8 was prepared using Preparation Example 7.

[0087] Example 9

[0088] A meltblown nonwoven fabric, which differs from Example 4 in that the antibacterial fiber is from a different source; the antibacterial fiber in Example 9 was prepared using Preparation Example 8.

[0089] Example 10

[0090] A meltblown nonwoven fabric differs from Example 8 in that the fabric undergoes the following pretreatment before being immersed in the antibacterial solution: a 0.02 mol / L dopamine hydrochloride solution is added to a 10 mmol / L tris(hydroxymethyl)aminomethane solution, mixed thoroughly, and the pH is adjusted to 8.6 with a 30% hydrochloric acid solution. The nonwoven fabric is then immersed in the solution for 22 hours, removed, washed with water, and dried to obtain the pretreated fabric. The volume ratio of the dopamine hydrochloride solution to the tris(hydroxymethyl)aminomethane solution is 1:1. Comparative Example

[0091] Comparative Example 1

[0092] A meltblown nonwoven fabric, which differs from Example 1 in that the antibacterial fiber is replaced by an equal amount of polypropylene fiber.

[0093] Comparative Example 2

[0094] A meltblown nonwoven fabric, which differs from Example 1 in that the silver-loaded loquat pomace is replaced with an equal amount of loquat pomace.

[0095] Comparative Example 3

[0096] A meltblown nonwoven fabric, which differs from Example 1 in that the silver-loaded loquat pomace is replaced with an equal amount of silver nitrate.

[0097] Performance testing

[0098] The following performance tests were performed on the meltblown nonwoven fabrics in Examples 1-10 and Comparative Examples 1-3:

[0099] The inhibition rates of *Escherichia coli*, *Staphylococcus aureus*, and *Streptococcus epidermidis* were tested according to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Shaking method". The results are shown in Table 2. The total original colony count of *Escherichia coli* was 1.85 × 10⁻⁶. 6 CFU / g, the original total colony count of Staphylococcus aureus was 1.90 × 10⁻⁶. 6 CFU / g, the original total colony count of Streptococcus albus was 1.85 × 10⁻⁶. 6 CFU / g.

[0100]

[0101] As can be seen from Table 2, the meltblown nonwoven fabric of this application improves the antibacterial rate of nonwoven fabric against Escherichia coli, Staphylococcus aureus and Streptococcus epidermidis through the synergistic effect between the raw materials. The antibacterial rate of Escherichia coli is 97.6-99.8%, the antibacterial rate of Staphylococcus aureus is 96.9-99.5%, and the antibacterial rate of Streptococcus epidermidis is 87.0-89.6%.

[0102] Combining Example 1 and Comparative Examples 1-3, it can be seen that the antibacterial rate of Escherichia coli, Staphylococcus aureus, and Streptococcus albus in the nonwoven fabric of Example 1 was 97.6%, the antibacterial rate of Staphylococcus aureus was 96.9%, and the antibacterial rate of Streptococcus albus was 87.0%, which was better than that of Comparative Examples 1-3. This indicates that the antibacterial fiber obtained by modifying PET chips with silver-impregnated loquat pomace is more suitable for nonwoven fabrics, and can improve the antibacterial rate of nonwoven fabrics against Escherichia coli, Staphylococcus aureus, and Streptococcus albus.

[0103] As can be seen from Examples 1-5, the antibacterial rate of Escherichia coli in the nonwoven fabric in Example 4 was 98.7%, the antibacterial rate of Staphylococcus aureus was 98.2%, and the antibacterial rate of Streptococcus albus was 88.1%, which was better than other examples. This indicates that the amount of each raw material added in Example 4 was more appropriate and could better improve the antibacterial properties of the nonwoven fabric.

[0104] As can be seen from Examples 4 and 6-9, the antibacterial rate of Escherichia coli, Staphylococcus aureus, and Streptococcus albus in the nonwoven fabric of Example 8 was 99.5%, 99.2%, and 89.3%, which is better than other examples. This indicates that the antibacterial fiber prepared by Example 7 is more suitable and can better improve the antibacterial properties of the nonwoven fabric.

[0105] Combining Examples 8 and 10, it can be seen that the inhibition rate of Escherichia coli, Staphylococcus aureus, and Streptococcus pyogenes in the nonwoven fabric in Example 10 was 99.8%, 99.5%, and 89.6%, indicating that pretreatment of the fabric is more suitable and can further improve the antibacterial properties of the nonwoven fabric.

[0106] The above-described embodiments are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A meltblown nonwoven fabric, characterized in that: It comprises the following raw materials in parts by weight: 50-65 parts polypropylene fiber, 15-20 parts polyester fiber, 8-12 parts antibacterial fiber, 5-9 parts zinc oxide, 2-6 parts mannitol, and 3-5 parts zinc stearate. The antibacterial fiber is obtained by melt spinning silver-loaded loquat pomace and PET chips. The antibacterial fiber is prepared by the following method: silver-loaded loquat pomace is mixed evenly with PET chips, and melt-spun to obtain antibacterial fiber; The weight ratio of the silver-loaded loquat pomace to PET slices is (0.4-0.6):1; The silver-loaded loquat pomace was prepared using the following method; A1: Loquat pomace is placed in an ethanol solution for extraction. The extraction is repeated, the filtrates are combined, the solvent is recovered, and an extract is obtained. The extract is then extracted to obtain loquat pomace extract. A2: Add loquat pomace extract and silver nitrate to water, mix well, heat until brownish-yellow, stop heating, centrifuge, filter, and obtain silver-loaded loquat pomace; The weight ratio of the loquat pomace extract to silver nitrate is 1:(0.8-1.2); The method for forming the meltblown nonwoven fabric includes the following steps: S1: Zinc oxide, mannitol, and zinc stearate are extruded and granulated, then melt-spun to obtain composite fibers. Polypropylene fibers, polyester fibers, antibacterial fibers, and composite fibers are opened and combed separately, then cross-laid into a web. The laid fiber web is reinforced by hydroentangling and dried to obtain the greige fabric. S2: Soak the raw fabric in the antibacterial solution, take it out, dry it, and obtain meltblown nonwoven fabric; The specific steps for pretreating the fabric with dopamine hydrochloride solution before immersing it in the antibacterial solution are as follows: Dopamine hydrochloride solution is added to tris(hydroxymethyl)aminomethane solution and mixed evenly. The pH value is adjusted to 8.5-8.8 with hydrochloric acid solution. The nonwoven fabric is then immersed in the solution for 20-24 hours. After immersion, the fabric is removed, washed with water, and dried to obtain the pretreated fabric.

2. The method for forming meltblown nonwoven fabric according to claim 1, characterized in that: The antibacterial solution is prepared by the following method: zinc oxide is added to aloe vera extract, mixed evenly, and left to stand for a period of time to obtain the antibacterial solution.

3. The method for forming meltblown nonwoven fabric according to claim 2, characterized in that: The amount of zinc oxide added to each 1 mL of aloe vera extract is 0.5-1.5 g.

4. The method for forming meltblown nonwoven fabric according to claim 2, characterized in that: The aloe vera extract is prepared by the following method: the aloe vera is washed, dried, crushed, sieved, added to an ethanol solution, heated and extracted for a period of time, filtered, and the filtrate is collected to obtain the aloe vera extract.

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