Sepiolite polypropylene non-woven fabric with antibacterial adsorption effect

Abstract

The invention relates to the technical field of non-woven fabrics, in particular to a sepiolite polypropylene non-woven fabric with an antibacterial adsorption effect, and a preparation method comprises the following steps: soaking a polypropylene non-woven fabric in a modified sepiolite dispersion liquid, taking out, padding, and drying to obtain the sepiolite polypropylene non-woven fabric with the antibacterial adsorption effect. The modified sepiolite dispersion liquid is prepared from sepiolite, a hydrochloric acid solution, a magnesium chloride solution and a silane blending liquid; the silane blending liquid is prepared from water, ethanol and a silane coupling agent KH-550. As more Mg < 2 + > is loaded onto the sepiolite after the sepiolite with better adsorbability is subjected to acid modification, and the Mg < 2 + >-loaded sepiolite is subjected to graft modification on the basis, the sepiolite can be uniformly and firmly distributed on the polypropylene non-woven fabric in the padding process; therefore, the sepiolite polypropylene non-woven fabric prepared by the preparation method disclosed by the invention is relatively good in adsorbability, antibacterial property and antibacterial durability.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabrics, and in particular to a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect. Background Art

[0002] Sepiolite is a fibrous hydrous magnesium silicate, usually in white, light gray, light yellow and other colors, opaque and without luster. The β-Sepiolite produced in Xiangtan is often in the form of soil, composed of very fine and short fibers or fibrous aggregates, and has the characteristics of being pure natural, non-toxic, odorless, asbestos-free, and non-radioactive. At the same time, its unique structure determines that it has good adsorption, rheological and catalytic properties. In addition, sepiolite also has a certain bactericidal effect and can be used as a natural source of antibacterial materials.

[0003] Polypropylene non-woven fabrics are widely used in medical and health care, and environmentally friendly packaging due to their good air permeability, extremely low moisture regain, wear resistance, acid and alkali resistance, high output, low cost, and high strength. However, polypropylene molecules do not have any hydrophilic groups, so they are extremely inert and hydrophobic, which brings great difficulties to the functionalization of polypropylene non-woven fabric materials and limits the further development of polypropylene non-woven fabrics. The existing technology commonly uses surface coating modification, blending modification, redox modification, plasma modification, ultraviolet irradiation modification and other methods to improve. However, most of the polypropylene non-woven fabrics prepared by the modification methods have relatively poor performance in terms of antibacterial persistence.

[0004] Patent technology document CN113293616B discloses a method for preparing an antibacterial polypropylene non-woven fabric, and the specific preparation method is: firstly, the polypropylene non-woven fabric is ultrasonically cleaned with anhydrous ethanol, then soaked in an ethanol solution of benzophenone at room temperature in the dark, then dripped with an aqueous solution of β-acryloxypropionic acid, and subjected to ultraviolet light irradiation grafting modification at room temperature, and finally soaked in an aqueous solution of an antibacterial agent to obtain an antibacterial polypropylene non-woven fabric. This invention introduces active groups on the surface of the polypropylene non-woven fabric through ultraviolet light irradiation modification, transforms the inert, hydrophobic polypropylene non-woven fabric into a hydrophilic, active polypropylene non-woven fabric, thereby improving the stability of the antibacterial agent loading of the polypropylene non-woven fabric and the durability of the release, but the antibacterial property of the polypropylene non-woven fabric still needs to be improved.

[0005] Patent technology document CN115710818A discloses a polypropylene non-woven fabric finished with a composite antibacterial material of sepiolite fiber and carbon nanotube loaded with silver ions. The preparation method of the invention is as follows: placing carbon nanotubes in a chamber, bombarding the carbon nanotubes with plasma, and obtaining surface-activated carbon nanotubes; acid-activating and thermally modifying the sepiolite fibers; wet-mixing the activated carbon nanotubes with the acid-activated sepiolite fibers to prepare a sepiolite fiber-carbon nanotube composite material; mixing the sepiolite fiber-carbon nanotube composite material and AgN O3 solution reaction, prepare silver ion loaded sepiolite fiber carbon nanotube composite antibacterial material; wet the polypropylene non-woven fabric with clean water, immerse it in the finishing solution containing silver ion loaded sepiolite fiber carbon nanotube composite antibacterial material, take it out and use a padding machine for the first padding, then immerse it in the finishing solution containing silver ion loaded sepiolite fiber carbon nanotube composite antibacterial material, take it out and use a padding machine for the second padding, dry it, and obtain the polypropylene non-woven fabric finished with silver ion loaded sepiolite fiber carbon nanotube composite antibacterial material. The polypropylene non-woven fabric prepared by this method has a relatively high antibacterial rate, but the cost is too high and the antibacterial durability is relatively poor.

[0006] Therefore, according to the above-mentioned related technologies, it is urgent to develop a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect, so as to improve the problem of poor antibacterial durability of polypropylene non-woven fabrics in the prior art.

[0008] Based on the above purpose, the present invention provides a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect.

[0009] A method for preparing a sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect comprises: soaking the polypropylene nonwoven fabric in a modified sepiolite dispersion, taking it out and padding it, and drying it to obtain the sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect;

[0010] The modified sepiolite dispersion is prepared from the following raw materials in parts by weight: 2+ 200-250 parts of sepiolite dispersion; 45-50 parts of silane preparation liquid;

[0011] The loaded Mg 2+ The sepiolite dispersion is prepared from the following raw materials in parts by weight: 15-20 parts of sepiolite; 250-300 parts of hydrochloric acid solution; 200-225 parts of magnesium chloride solution;

[0012] The silane preparation liquid is prepared from water, ethanol and silane coupling agent KH-550.

[0013] Preferably, the soaking temperature is 70-75°C and the soaking time is 20-30 minutes.

[0014] Preferably, the rolling rate of the impregnation is 65%-70%; and the temperature during drying is 50-55°C.

[0015] Preferably, the preparation method of the silane formulation solution is as follows:

[0016] Mix water, ethanol and silane coupling agent KH-550, and then ultrasonically oscillate for 5-10 minutes to obtain a silane preparation solution.

[0017] Preferably, the mass ratio of water, ethanol and silane coupling agent KH-550 is 4-5:35-37:8-11.

[0018] Preferably, the loaded Mg 2+ The preparation method of the sepiolite dispersion is as follows:

[0019] Step S1. Add sepiolite to the hydrochloric acid solution, stir at 70-80°C for 45-60 minutes, filter and wash until the pH value of the filtrate is 6-7, recover the filtrate, recrystallize to obtain magnesium chloride, dissolve the magnesium chloride in deionized water to obtain a magnesium chloride solution; dry and crush the filter residue to obtain pretreated sepiolite;

[0020] Step S2. Add pretreated sepiolite to the magnesium chloride solution, stir at 20-25°C for 4-5h, then filter, add water to the residue, and obtain the loaded Mg 2+ of sepiolite dispersion.

[0021] Preferably, the sepiolite in step S1 is sepiolite powder with a fineness of 800-1000 mesh.

[0022] Preferably, the mass fraction of the hydrochloric acid solution in step S1 is 5%-6%, and the mass fraction of the prepared magnesium chloride solution is 15%-17%.

[0023] Preferably, the mass ratio of the pretreated sepiolite and the magnesium chloride solution in step S2 is 8-10:200-225; the obtained loaded Mg 2+ The mass fraction of the sepiolite dispersion is 2%-3%.

[0024] Preferably, the preparation method of the modified sepiolite dispersion is as follows:

[0025] Loading Mg 2+The sepiolite dispersion is heated to 45-50°C, stirred at 45-50°C for 5-10 minutes, poured into the silane preparation solution, heated to 80-85°C, refluxed at 80-85°C for 4-5 hours, cooled to 20-25°C, then filtered, deionized water is added to the filter residue to obtain a modified sepiolite dispersion with a mass fraction of 0.5%-1%.

[0026] Beneficial effects of the present invention:

[0027] The invention provides a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect. The polypropylene non-woven fabric provided by the invention has high antibacterial persistence.

[0028] The present invention provides a sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect. The present invention firstly performs acid modification on the sepiolite, and then adds more Mg 2+ Loaded onto sepiolite, some antibacterial Mg 2+ Enter the pores of sepiolite; on this basis, the present invention also loads Mg 2+ The sepiolite was grafted and modified so that the sepiolite can be evenly and firmly distributed on the polypropylene non-woven fabric during the padding process, further improving the antibacterial properties and antibacterial durability of the sepiolite polypropylene non-woven fabric. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0030] The properties of some of the raw materials used in the present invention are as follows: Polypropylene non-woven fabric was purchased from Dongguan Baoxinghui Industrial Co., Ltd. (weight: 30g / m 2 ), sepiolite was purchased from Xiangtan Sepiolite Technology Co., Ltd. (fineness: 800 mesh), and silane coupling agent KH-550 was purchased from Hubei Wonder Chemical Co., Ltd. (CAS: 211519-85-6).

[0031] Embodiment 1: A sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect, the preparation method of which comprises the following steps:

[0032] Step S1. 4 g of water, 35 g of ethanol and 11 g of silane coupling agent KH-550 were mixed, and then ultrasonically vibrated for 5 min to obtain a silane preparation solution;

[0033] Step S2. Add 15 g of sepiolite to 250 g of 5% hydrochloric acid solution, stir at 70°C for 45 min, filter and wash until the pH value of the filtrate is 6, recover the filtrate, recrystallize to obtain magnesium chloride, dissolve the magnesium chloride in deionized water to obtain a magnesium chloride solution with a mass fraction of 15%; dry and crush the filter residue to obtain pretreated sepiolite;

[0034] Step S3. Add 8g of pretreated sepiolite to 200g of 15% magnesium chloride solution, stir at 20°C for 4h, then filter, add water to the residue, and obtain a 2% magnesium chloride solution. 2+ of sepiolite dispersion;

[0035] Step S4. 200 g of 2% Mg-loaded 2+ The sepiolite dispersion was heated to 45°C, stirred at 45°C for 5 minutes, and then 45g of silane preparation liquid was added, and the temperature was raised to 80°C, and refluxed at 80°C for 4 hours, and then cooled to 20°C, and then filtered, and deionized water was added to the filter residue to obtain a modified sepiolite dispersion with a mass fraction of 0.5%;

[0036] Step S5. Wet a 3cm×20cm polypropylene non-woven fabric with deionized water, put it into a modified sepiolite dispersion with a mass fraction of 0.5%, soak it at 70°C for 20 minutes, take it out and roll it with a rolling mill (rolling rate is 65%), and dry it at 50°C to obtain a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect.

[0037] Embodiment 2: A sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect, the preparation method of which comprises the following steps:

[0038] Step S1. 4.2 g of water, 35.8 g of ethanol and 10 g of silane coupling agent KH-550 were mixed, and then ultrasonically vibrated for 6 min to obtain a silane preparation solution;

[0039] Step S2. Add 16 g of sepiolite to 270 g of a 5.2% hydrochloric acid solution, stir at 73°C for 50 min, filter and wash until the pH value of the filtrate is 6, recover the filtrate, recrystallize to obtain magnesium chloride, dissolve the magnesium chloride in deionized water to obtain a magnesium chloride solution with a mass fraction of 16%; dry and crush the filter residue to obtain pretreated sepiolite;

[0040] Step S3. Add 8.5 g of pretreated sepiolite to 210 g of 16% magnesium chloride solution, stir at 22 ° C for 4.5 h, then filter, add water to the residue, and obtain a 2.5% loaded Mg solution. 2+ of sepiolite dispersion;

[0041] Step S4. 220 g of Mg-loaded 2+ The sepiolite dispersion was heated to 47°C, stirred at 47°C for 7 minutes, and then 47g of silane preparation liquid was added, and the temperature was raised to 82°C, refluxed at 82°C for 4.5 hours, cooled to 22°C, and then filtered, and deionized water was added to the filter residue to obtain a modified sepiolite dispersion with a mass fraction of 0.7%;

[0042] Step S5. Wet a 4cm×22cm polypropylene non-woven fabric with deionized water, put it into a modified sepiolite dispersion with a mass fraction of 0.7%, soak it at 72°C for 24 minutes, take it out and roll it with a rolling mill (rolling rate is 67%), and dry it at 52°C to obtain a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect.

[0043] Embodiment 3: A sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect, the preparation method of which comprises the following steps:

[0044] Step S1. 4.7 g of water, 36.5 g of ethanol and 8 g of silane coupling agent KH-550 were mixed, and then ultrasonically vibrated for 8 min to obtain a silane preparation solution;

[0045] Step S2. Add 18 g of sepiolite to 280 g of a 5.7% hydrochloric acid solution, stir at 78°C for 55 min, filter and wash until the pH value of the filtrate is 7, recover the filtrate, recrystallize to obtain magnesium chloride, dissolve the magnesium chloride in deionized water to obtain a magnesium chloride solution with a mass fraction of 16.5%; dry and crush the filter residue to obtain pretreated sepiolite;

[0046] Step S3. Add 9.5 g of pretreated sepiolite to 220 g of 16.5% magnesium chloride solution, stir at 24 ° C for 4.5 h, then filter, add water to the residue, and obtain a 2.8% loaded Mg solution. 2+ of sepiolite dispersion;

[0047] Step S4. 240 g of Mg-loaded 2+ The sepiolite dispersion was heated to 48°C, stirred at 48°C for 8 minutes, then 48g of silane preparation liquid was added, the temperature was raised to 84°C, refluxed at 84°C for 5 hours, cooled to 23°C, and then filtered, and deionized water was added to the filter residue to obtain a modified sepiolite dispersion with a mass fraction of 0.8%;

[0048] Step S5. After wetting a polypropylene non-woven fabric of size 4.5 cm × 24.5 cm with deionized water, put it into a modified sepiolite dispersion with a mass fraction of 0.8%, soak it at 74°C for 28 minutes, take it out and roll it with a rolling mill (rolling rate is 68%), and dry it at 54°C to obtain a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect.

[0049] Embodiment 4: A sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect, the preparation method of which comprises the following steps:

[0050] Step S1. 5 g of water, 37 g of ethanol and 8 g of silane coupling agent KH-550 were mixed, and then ultrasonically vibrated for 10 min to obtain a silane preparation solution;

[0051] Step S2. Add 20 g of sepiolite to 300 g of a 6% hydrochloric acid solution, stir at 80°C for 60 min, filter and wash until the pH value of the filtrate is 6-7, recover the filtrate, recrystallize to obtain magnesium chloride, dissolve the magnesium chloride in deionized water to obtain a magnesium chloride solution with a mass fraction of 17%; dry and crush the filter residue to obtain pretreated sepiolite;

[0052] Step S3. Add 10g of pretreated sepiolite to 225g of 17% magnesium chloride solution, stir at 25°C for 5h, then filter, add water to the residue, and obtain a 3% magnesium chloride solution. 2+ of sepiolite dispersion;

[0053] Step S4. 250 g of 3% Mg-loaded 2+ The sepiolite dispersion was heated to 50°C, stirred at 50°C for 10 minutes, and then 50g of silane preparation liquid was added, and the temperature was raised to 85°C, and refluxed at 85°C for 5 hours, and then cooled to 25°C, and then filtered, and deionized water was added to the filter residue to obtain a modified sepiolite dispersion with a mass fraction of 1%;

[0054] Step S5. Wet a 5cm×25cm polypropylene non-woven fabric with deionized water, put it into a 1% modified sepiolite dispersion, soak it at 75°C for 30 minutes, take it out and roll it with a rolling mill (rolling rate is 70%), and dry it at 55°C to obtain a sepiolite polypropylene non-woven fabric with antibacterial adsorption effect.

[0055] Comparative Example 1:

[0056] Compared with Example 1, this comparative example only replaces "200g of magnesium chloride solution with a mass fraction of 15%" with "200g of silver hydroxide solution with a mass fraction of 15%, and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a sepiolite polypropylene non-woven fabric is obtained.

[0057] Comparative Example 2:

[0058] Compared with Example 1, this comparative example only replaces "45g silane formulation liquid" with "90g silane formulation liquid", and the remaining steps and parameters are the same, which will not be repeated in this comparative example, and finally a sepiolite polypropylene non-woven fabric is obtained.

[0059] Comparative Example 3:

[0060] Compared with Example 1, the present comparative example did not add silane formulation liquid during the preparation of the sepiolite polypropylene non-woven fabric, and the remaining steps and parameters were the same, which will not be repeated in this comparative example. Finally, the sepiolite polypropylene non-woven fabric was obtained.

[0061] Performance Testing:

[0062] The performance tests were performed on the sepiolite polypropylene nonwoven fabrics prepared in Examples 1 to 3 and Comparative Examples 1 to 3:

[0063] Elongation at break test:

[0064] Referring to GB / T3923.1-2013 "Textiles - Fabric Tensile Properties, Part 1: Breaking Strength and Elongation at Break (Strip Method)", a sepiolite polypropylene non-woven fabric with a width of 25 mm and a length of 100 mm was taken, and an electronic tensile tester (SN-2c, Guangzhou Shounuo Scientific Instrument Co., Ltd.) was used to test the elongation at break of the sepiolite polypropylene non-woven fabric prepared in Example 1 to Example 3 and Comparative Example 1 to Comparative Example 3 at a tensile rate of 100 mm / min. To reduce the error, the result of each sample is the average of 5 measurements;

[0065] Antibacterial test:

[0066] According to GB / T20944.3-2008 "Textiles - Evaluation of Antibacterial Properties, Part 3: Oscillation Method", cut polypropylene non-woven fabric and sepiolite polypropylene non-woven fabric into pieces of about 5mm×5mm, weigh 0.75g as a sample, and wrap it with a small piece of paper. Put the small paper bag containing the sample into the autoclave, sterilize it at 121℃ and 103kPa for 15min, and obtain the sterilized sample. Take 9 conical flasks, label them, add 0.75g sterilized polypropylene non-woven fabric to bottles 1-3, add 0.75g sterilized sepiolite polypropylene non-woven fabric to bottles 4-6, and add nothing to bottles 7-9; then add 70mL of 0.03mol / L phosphate buffer to each flask; then add 5mL of inoculum containing Escherichia coli and Platycoccus aureus to bottles 1-6, and cover the bottle caps. The flasks of the nine samples were then shaken at 25°C and 150 r / min for 18 hours. The antibacterial rate (%) of the sepiolite polypropylene non-woven fabrics prepared in Examples 1 to 3 and Comparative Examples 1 to 3 was calculated according to the following formula:

[0067] Antibacterial rate formula:

[0068] W is the average value of the viable bacterial concentration in the flasks of bottles 1-3 after 18 hours of shaking (colony count / mL); Q is the average value of the viable bacterial concentration in the flasks of bottles 4-6 after 18 hours of shaking (colony count / mL)

[0069] Antibacterial test after 90 days:

[0070] According to GB / T20944.3-2008 "Textiles - Evaluation of Antibacterial Properties, Part 3: Oscillation Method", cut polypropylene non-woven fabric and sepiolite polypropylene non-woven fabric into pieces of about 5mm×5mm, weigh 0.75g as a sample, and wrap it with a small piece of paper. Put the small paper bag containing the sample into the autoclave, sterilize it at 121℃ and 103kPa for 15min, and obtain the sterilized sample. Take 9 conical flasks, label them, add 0.75g sterilized polypropylene non-woven fabric to bottles 1-3, add 0.75g sterilized sepiolite polypropylene non-woven fabric to bottles 4-6, and add nothing to bottles 7-9; then add 70mL of 0.03mol / L phosphate buffer to each flask; then add 5mL of inoculum containing Escherichia coli and Platycoccus aureus to bottles 1-6, and cover the bottle caps. The flasks of the nine samples were then shaken at 25°C and 150 r / min for 18 hours. The antibacterial rate (%) of the sepiolite polypropylene non-woven fabrics prepared in Examples 1 to 3 and Comparative Examples 1 to 3 after 90 days of storage was calculated according to the following formula:

[0071] Antibacterial rate formula:

[0072] W is the average value of the viable bacterial concentration in the flasks of bottles 1 to 3 after 18 hours of shaking (colony count / mL); Q is the average value of the viable bacterial concentration in the flasks of bottles 4 to 6 after 18 hours of shaking (colony count / mL);

[0073] Air permeability test:

[0074] According to GB / T5453-1997 Textiles-Fabric Air Permeability Test, a computerized air permeability tester (YG461E, Ningbo Textile Instrument Factory) was used to test the air permeability of the textiles in an area of ​​20 cm. 2 , under the condition of a pressure difference of 100 Pa, the air permeability (m / s) of the sepiolite polypropylene non-woven fabric prepared in Example 1 to Example 3 and Comparative Example 1 to Comparative Example 3. Repeat the test 10 times on the same sample and take the average value as the air permeability (m / s) of the sample;

[0075] Whiteness test:

[0076] Referring to GB / T8424.2-2001 "Textiles - Color Fastness Test, Instrumental Evaluation Method for Relative Whiteness" standard, a whiteness meter (WSB-3A, Wenzhou Darong Textile Instrument Co., Ltd.) was used to measure the whiteness of the sepiolite polypropylene non-woven fabrics prepared in Examples 1 to 3 and Comparative Examples 1 to 3; the test results are shown in Table 1.

[0077] Table 1

[0078]

[0079]

[0080] Data Analysis:

[0081] As can be seen from Table 1, the sepiolite polypropylene non-woven fabric prepared by the present invention has relatively high elongation at break, antibacterial rate, antibacterial rate after 90 days, air permeability and whiteness.

[0082] This may be because the present invention acid-modifies sepiolite, improves the purity of sepiolite, disperses sepiolite fiber bundles, expands micropores in the sepiolite structure to mesopores, increases the specific surface area of ​​sepiolite, and then increases active sites, achieving more Mg loading. 2+ The purpose is to improve the antibacterial rate of sepiolite polypropylene nonwoven fabric. 2+ When preparing antibacterial agents, some antibacterial Mg 2+ Enter the pores of sepiolite, which is beneficial to maintaining the antibacterial durability of the antibacterial agent. On this basis, the present invention also loads Mg 2+ An appropriate amount of amino functional groups are introduced into the sepiolite, so that the sepiolite can be evenly and firmly distributed on the polypropylene non-woven fabric during the padding process, while improving the mechanical properties, air permeability and whiteness of the polypropylene non-woven fabric, and further improving the antibacterial and antibacterial durability of the sepiolite polypropylene non-woven fabric. Therefore, the sepiolite polypropylene non-woven fabric prepared by the present invention has relatively high values ​​in terms of elongation at break, antibacterial rate, antibacterial rate after 90 days, air permeability and whiteness.

[0083] In Comparative Example 1, "200g of 15% magnesium chloride solution by mass" is replaced by "200g of 15% silver hydroxide solution by mass". It can be seen from Table 1 that compared with Example 1, the antibacterial rate after 90 days is relatively low. This is because the activity of silver ions is relatively high, so the polypropylene non-woven fabric prepared therefrom has the problem of unstable antibacterial properties. Therefore, the antibacterial rate of the sepiolite polypropylene non-woven fabric prepared in Comparative Example 1 in which magnesium chloride is replaced by silver chloride is relatively low after 90 days; Comparative Example 2 replaces "45g silane formulation" with "90g silane formulation". It can be seen from Table 1 that compared with Example 1, the elongation at break is relatively high, the antibacterial rate and the antibacterial rate after 90 days are relatively low. This is because a large amount of silane coupling agent is added, a large amount of amino groups are introduced, so that the sepiolite can be evenly and firmly distributed on the polypropylene non-woven fabric during the impregnation process, thereby improving the mechanical properties of the polypropylene non-woven fabric, but too much silane coupling agent will rob a large number of active sites, reducing the Mg on the sepiolite 2+ The loading amount, Mg 2+As an antibacterial substance, the reduction in its loading amount results in that the antibacterial rate and the antibacterial rate after 90 days of the sepiolite polypropylene non-woven fabric prepared in Comparative Example 2 in which an excessive amount of silane coupling agent is added during the preparation process are relatively low relative to Example 1; Comparative Example 3 does not add silane formulation liquid during the preparation process of the sepiolite polypropylene non-woven fabric. It can be seen from Table 1 that compared with Example 1, its elongation at break, antibacterial rate, antibacterial rate after 90 days, air permeability and whiteness are relatively low. This is because the addition of an appropriate amount of silane coupling agent will introduce an appropriate amount of amino group, so that the sepiolite can be evenly and firmly distributed on the polypropylene non-woven fabric during the padding process, thereby improving the mechanical properties, air permeability, whiteness, antibacterial and antibacterial durability of the polypropylene non-woven fabric. Therefore, the elongation at break, antibacterial rate, antibacterial rate after 90 days, air permeability and whiteness of the sepiolite polypropylene non-woven fabric prepared in Comparative Example 3 without using a silane coupling agent are relatively low.

[0084] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0085] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, 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 sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect, characterized in that: The preparation method of the sepiolite polypropylene non-woven fabric comprises: soaking the polypropylene non-woven fabric in a modified sepiolite dispersion, taking it out and padding it, and drying it to obtain the sepiolite polypropylene non-woven fabric with antibacterial adsorption effect; The modified sepiolite dispersion is prepared from the following raw materials in parts by weight: 2+ 200-250 parts of sepiolite dispersion; 45-50 parts of silane preparation liquid; The loaded Mg 2+ The sepiolite dispersion is prepared from the following raw materials in parts by weight: 15-20 parts of sepiolite; 250-300 parts of hydrochloric acid solution; 200-225 parts of magnesium chloride solution; The silane preparation liquid is prepared from water, ethanol and silane coupling agent KH-550.

2. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 1, characterized in that: The soaking temperature is 70-75°C and the soaking time is 20-30 minutes.

3. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 1, characterized in that: The rolling rate of the impregnation is 65%-70%; the temperature during drying is 50-55°C.

4. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 1, characterized in that: The silane preparation liquid preparation method is as follows: Mix water, ethanol and silane coupling agent KH-550, and then ultrasonically oscillate for 5-10 minutes to obtain a silane preparation solution.

5. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 4, characterized in that: The mass ratio of the water, ethanol and silane coupling agent KH-550 is 4-5:35-37:8-11.

6. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 1, characterized in that: The loaded Mg 2+ The preparation method of the sepiolite dispersion is as follows: Step S1. Add sepiolite to the hydrochloric acid solution, stir at 70-80°C for 45-60 minutes, filter and wash until the pH value of the filtrate is 6-7, recover the filtrate, recrystallize to obtain magnesium chloride, dissolve the magnesium chloride in deionized water to obtain a magnesium chloride solution; dry and crush the filter residue to obtain pretreated sepiolite; Step S2. Add pretreated sepiolite to the magnesium chloride solution, stir at 20-25°C for 4-5h, then filter, add water to the residue, and obtain the loaded Mg 2+ of sepiolite dispersion.

7. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 6, characterized in that: The sepiolite in step S1 is sepiolite powder with a fineness of 800-1000 mesh.

8. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 6, characterized in that: The mass fraction of the hydrochloric acid solution in step S1 is 5%-6%, and the mass fraction of the prepared magnesium chloride solution is 15%-17%.

9. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 6, characterized in that: The mass ratio of the pretreated sepiolite and the magnesium chloride solution in step S2 is 8-10:200-225; the obtained loaded Mg 2+ The mass fraction of the sepiolite dispersion is 2%-3%.

10. The sepiolite polypropylene nonwoven fabric with antibacterial adsorption effect according to claim 1, characterized in that: The preparation method of the modified sepiolite dispersion is as follows: Loading Mg 2+ The sepiolite dispersion is heated to 45-50°C, stirred at 45-50°C for 5-10 minutes, poured into the silane preparation solution, heated to 80-85°C, refluxed at 80-85°C for 4-5 hours, cooled to 20-25°C, then filtered, deionized water is added to the filter residue to obtain a modified sepiolite dispersion with a mass fraction of 0.5%-1%.

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