A melt-blown polypropylene composite material and its preparation method and application

Abstract

The invention discloses a melt-blown polypropylene composite material and a preparation method and application thereof, and relates to the technical field of polymer materials. The invention provides a melt-blown polypropylene composite material, comprising the following components in parts by weight: 90-94 parts of polypropylene melt-blown material, 3-5 parts of platinum-loaded organic zirconium phosphonate, and 3-5 parts of electret masterbatch. The melt-blown polypropylene composite material prepared by the specific polypropylene melt-blown material, platinum-loaded organic zirconium phosphonate, and electret masterbatch of the invention has both antibacterial and formaldehyde-removing effects, and both antibacterial and formaldehyde-removing effects are better.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, in particular to a melt-blown polypropylene composite material and a preparation method and application thereof. Background Art

[0002] Polypropylene meltblown cloth has many voids, a fluffy structure, and many fine fibers, so it has good filtering, shielding, insulation, and oil absorption properties. It can be used in filter materials, isolation materials, thermal insulation materials, oil-absorbing materials, and wiping cloths. Conventional polypropylene meltblown cloth has no antibacterial and formaldehyde removal functions, but in the field of filtration, the demand for antibacterial and formaldehyde removal has been recognized by the market. In meltblown filter materials, the conventional technology for formaldehyde removal uses modified activated carbon for formaldehyde removal. After a period of use, the modified activated carbon has clogged pores, bacteria die, and breed, resulting in an unpleasant odor on the filter.

[0003] At present, the main methods to achieve antibacterial function are through surface modification technology (such as coating, impregnation and other finishing methods) and blending modification technology. Surface modification technology often has the risk of falling off during actual use, and the substances after falling off may cause harm to the human body or the environment. Therefore, the development of a melt-blown polypropylene composite material with both antibacterial and formaldehyde removal functions has become a hot spot and difficulty in the industry. Summary of the invention

[0004] Based on this, the purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a melt-blown polypropylene composite material having both antibacterial and formaldehyde-removing functions, as well as a preparation method and application thereof.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a melt-blown polypropylene composite material, comprising the following components in parts by weight: 90-94 parts of polypropylene melt-blown material, 3-5 parts of platinum-loaded organic zirconium phosphonate, and 3-5 parts of electret masterbatch.

[0006] The inventors found in the actual experimental process that layered zirconium phosphate is a layered structure with adsorbable ions. It is an efficient, safe and heat-resistant ion exchange material with good chemical stability, acid and alkali resistance and thermal stability. It is usually used to load silver, copper, zinc and other ions to make durable antibacterial agents. However, the conventional interlayer spacing is smaller than the diameter of general metal ions, so it is difficult for metal ions to directly insert into the interlayer of zirconium phosphate, and the -OH group on the surface of the layer can be replaced by p-aminobenzoic acid, which increases the interlayer spacing and the metal ion (M + ) can enter the interlayer and apex hydrogen exchange to obtain M + Zirconium organophosphonate.

[0007] Preferably, the melt index of the polypropylene meltblown material is 1200-1500 g / 10 min, and the melt index of the polypropylene meltblown material is measured according to ASTM D1238 using a weight of 2.16 kg and a temperature of 190° C.

[0008] Preferably, the content of platinum in the platinum-supported organic zirconium phosphonate is 3.5wt%-6.5wt%.

[0009] Platinum content determination method: After decomposition with hydrofluoric acid, the platinum content is determined by the ammonium chloroplatinate weight method.

[0010] The inventors found in the actual experimental process that when the content of platinum in the platinum-loaded zirconium organic phosphonate is 3.5wt%-6.5wt%, the antibacterial and formaldehyde removal effects are optimal. When the platinum loading is higher than 6.5wt%, the interlayer structure of the zirconium organic phosphonate is destroyed and the antibacterial effect is reduced. When the platinum loading is lower than 3.5wt%, the formaldehyde removal effect is slightly poor.

[0011] Preferably, the platinum-loaded zirconium organic phosphonate is added in the form of platinum-loaded zirconium organic phosphonate masterbatch.

[0012] Preferably, the mass percentage of the platinum-supported organic zirconium phosphonate in the platinum-supported organic zirconium phosphonate masterbatch is 16-32%.

[0013] The inventors found in actual experiments that when platinum-loaded zirconium organophosphonate is added in the form of platinum-loaded zirconium organophosphonate masterbatch and the mass percentage of platinum-loaded zirconium organophosphonate in the platinum-loaded zirconium organophosphonate masterbatch is limited, the resulting product has better antibacterial and formaldehyde removal effects.

[0014] Preferably, the preparation method of the platinum-loaded zirconium organic phosphonate masterbatch is: 68-84 parts of polypropylene melt-blown material and 16-32 parts of platinum-loaded zirconium organic phosphonate are uniformly mixed in proportion, added into a twin-screw extruder for melt extrusion, drawing, granulation, and drying to obtain the platinum-loaded zirconium organic phosphonate masterbatch.

[0015] Preferably, the extrusion temperature is 220-230°C.

[0016] Preferably, the method for preparing the platinum-supported organic zirconium phosphonate comprises the following steps:

[0017] (1) mixing p-aminobenzoic acid-N, N-dimethylphosphonic acid zirconium, water, and a platinum-containing compound, adjusting the pH value, heating, and performing post-reaction treatment to obtain a solid A;

[0018] (2) calcining the solid A to obtain the platinum-supported organic zirconium phosphonate.

[0019] Preferably, it comprises at least one of the following features (a)-(e):

[0020] (a) In the step (1), the mass ratio of p-aminobenzoic acid-N,N-dimethylphosphonic acid zirconium, water, and the platinum-containing compound is p-aminobenzoic acid-N,N-dimethylphosphonic acid zirconium: water: platinum-containing compound = (1-1.5): 10: (1-2);

[0021] (b) In step (1), the platinum-containing compound is at least one of chloroplatinic acid, potassium chloroplatinate, platinum acetylacetonate, sodium chloroplatinate, ammonium chloroplatinate, platinum tetrachloride, and potassium tetrachloroplatinate;

[0022] (c) In step (1), the heating time is 3 to 5 hours;

[0023] (d) In step (1), the pH value is adjusted to 7-13;

[0024] (e) In the step (2), the calcination temperature is 600-700° C. and the calcination time is 4-6 hours.

[0025] Further preferably, in the step (1), the pH value is adjusted to 10-12.

[0026] In addition, the present invention provides a method for preparing the melt-blown polypropylene composite material, comprising the following steps:

[0027] (1) Weigh various components according to the ratio;

[0028] (2) mixing the components in step (1) to obtain a mixture A;

[0029] (3) conveying the mixture A obtained in step (2) to a screw extruder for extrusion granulation to obtain the melt-blown polypropylene composite material.

[0030] Furthermore, the present invention provides an application of the meltblown polypropylene composite material in the fields of medicine, health and food packaging. Preferably, the present invention provides an application of the meltblown polypropylene composite material in hospital / indoor air purifiers, fresh air systems in food production workshops, and non-woven packaging layers of building materials.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: the melt-blown polypropylene composite material prepared by the specific polypropylene melt-blown material, platinum-loaded organic zirconium phosphonate and electret masterbatch of the present invention has both antibacterial and formaldehyde-removing effects, and both the antibacterial and formaldehyde-removing effects are better. DETAILED DESCRIPTION

[0032] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0033] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0034] The raw materials used in the embodiments and comparative examples are described below, but are not limited to these materials:

[0035] Polypropylene meltblown material 1: PP-91500NC001, Kingfa Technology, 190°C, 2.16kg, melt mass flow rate 1500g / 10min;

[0036] Polypropylene meltblown material 2: Metocene MF650Y, Basel, melt mass flow rate 1200 g / 10 min at 190 °C / 2.16 kg;

[0037] Electret masterbatch: YBL-EL032 NC001, Kingfa Technology, the electret masterbatch contains polypropylene melt-blown material, tourmaline, stearate, antioxidant and other ingredients;

[0038] Platinum-supported zirconium organic phosphonate 1: homemade, with a platinum content of 2±0.2wt%;

[0039] Platinum-supported zirconium organophosphonate 2: homemade, with a platinum content of 4±0.2wt%;

[0040] Platinum-supported zirconium organophosphonate 3: homemade, with a platinum content of 6±0.2wt%;

[0041] Platinum-supported zirconium organophosphonate 4: homemade, with a platinum content of 8±0.2wt%;

[0042] Platinum-supported zirconium organophosphonate 5: homemade, with a platinum content of 2±0.2wt%;

[0043] Platinum-supported zirconium phosphonate 6: homemade, with a platinum content of 2±0.2wt%;

[0044] Silver-loaded zirconium organic phosphonate: the content of silver element is 4±0.2wt%, Shanghai Runhe Nanomaterial Technology Co., Ltd., NAFUR RHA-1F-II;

[0045] The preparation method of platinum-supported organophosphonic acid zirconium 1 is as follows:

[0046] (1) preparing an organic zirconium phosphonate, the preparation method being specifically as follows:

[0047] S1: Dissolve a certain amount of phosphorous acid and p-aminobenzoic acid in 1000 ml of water to prepare a mixed solution with a sum of the mass concentration of phosphorous acid and p-aminobenzoic acid being 30%. Then add 40 ml of concentrated hydrochloric acid with a mass concentration of 38%, stir and heat to 110±5°C, then add 120 ml of formaldehyde solution with a mass fraction of 40±5%, and reflux at 110±5°C for 2 hours. Finally, stir at room temperature to obtain an organic phosphonic acid. The molar ratio of phosphorous acid to p-aminobenzoic acid is 2:1.

[0048] S2: dissolving a certain amount of zirconium oxychloride in distilled water to prepare a 10% aqueous solution 1, dispersing a certain amount of p-aminobenzoic acid-N, N-dimethylphosphonic acid obtained in step S1 in distilled water to prepare a 10% solution 2; heating solution 1 to 70°C, adding solution 2 under strong stirring, reacting for 100 hours, filtering the product, washing with deionized water to pH = 5-6, and drying for 48 hours to obtain p-aminobenzoic acid-N, N-dimethylphosphonic acid zirconium product. The molar ratio of p-aminobenzoic acid-N, N-dimethylphosphonic acid to zirconium oxychloride is 1:1.

[0049] (2) A certain amount of p-aminobenzoic acid-N, N-dimethylphosphonic acid zirconium and deionized water are prepared into a 10wt% suspension, and then a certain amount of a platinum-containing compound with a mass concentration of 10% is added and mixed. After adjusting the pH value, the mixture is heated at 70°C for 4 hours, filtered, washed, and dried to obtain solid A; the molar ratio of p-aminobenzoic acid-N, N-dimethylphosphonic acid zirconium and the platinum-containing compound is 10:2, the platinum-containing compound is chloroplatinic acid, and the pH value is adjusted to 7-8.

[0050] (3) The solid A is calcined to obtain the platinum-supported organic zirconium phosphonate. The calcination temperature is 600° C. and the calcination time is 6 hours.

[0051] The only difference between the preparation method of platinum-supported zirconium organic phosphonate 2 and the preparation method of platinum-supported zirconium organic phosphonate 1 is that in step (2), the molar ratio of p-aminobenzoic acid-N,N-dimethylphosphonic acid zirconium and the platinum-containing compound is 10:4.

[0052] The only difference between the preparation method of platinum-supported zirconium organic phosphonate 3 and the preparation method of platinum-supported zirconium organic phosphonate 1 is that in step (2), the molar ratio of p-aminobenzoic acid-N,N-dimethylphosphonic acid zirconium and the platinum-containing compound is 10:6.

[0053] The only difference between the preparation method of platinum-supported zirconium organic phosphonate 4 and the preparation method of platinum-supported zirconium organic phosphonate 1 is that in step (2), the molar ratio of p-aminobenzoic acid-N,N-dimethylphosphonic acid zirconium and the platinum-containing compound is 10:8.

[0054] The preparation method of platinum-supported organophosphonic acid zirconium 5 is as follows:

[0055] (1) preparing an organic zirconium phosphonate to obtain a compound having a molecular formula (I), wherein the preparation method is specifically as follows:

[0056] S1: Dissolve a certain amount of phosphorous acid and ethylamine in 1000ml of water to prepare a mixed solution with a sum of mass concentrations of phosphorous acid and ethylamine of 30%. Then add 40ml of concentrated hydrochloric acid with a mass concentration of 38%, stir and heat to 110±5℃, then add 120ml of formaldehyde solution with a mass fraction of 40±5%, and reflux at 110±5℃ for 2h. Finally, stir at room temperature to obtain organic phosphonic acid. The molar ratio of phosphorous acid to ethylamine is 2:1.

[0057] S2: dissolving a certain amount of zirconium oxychloride in distilled water to prepare a solution 1 with a concentration of 10%, dispersing a certain amount of ethyl-N, N-dimethylphosphonic acid obtained in step S1 in distilled water to prepare a solution 2 with a concentration of 10%; heating solution 1 to 70°C, adding solution 2 under strong stirring, reacting for 100 hours, filtering the product, washing with deionized water to pH = 5-6, and drying for 48 hours to obtain ethyl-N, N-dimethylphosphonic acid zirconium product. The molar ratio of ethyl-N, N-dimethylphosphonic acid to zirconium oxychloride is 1:1.

[0058] (2) A certain amount of ethyl-N, N-dimethyl zirconium phosphonate and deionized water are prepared into a 10wt% suspension, and then a certain amount of a platinum-containing compound with a mass concentration of 10% is added and mixed. After adjusting the pH value, the mixture is heated at 70°C for 4 hours, filtered, washed and dried after the reaction to obtain solid A; the molar ratio of ethyl-N, N-dimethyl zirconium phosphonate and the platinum-containing compound is 10:2, the platinum-containing compound is chloroplatinic acid, and the pH value is adjusted to 7-8.

[0059] (3) The solid A is calcined to obtain the platinum-supported organic zirconium phosphonate. The calcination temperature is 600° C. and the calcination time is 6 hours.

[0060] The preparation method of platinum-supported organophosphonic acid zirconium 6 is as follows:

[0061] (1) preparing an organic zirconium phosphonate to obtain a compound having a molecular formula (I), wherein the preparation method is specifically as follows:

[0062] S1: Dissolve a certain amount of phosphorous acid and octylamine in 1000ml of water to prepare a mixed solution with a sum of the mass concentration of phosphorous acid and octylamine being 30%. Then add 40ml of concentrated hydrochloric acid with a mass concentration of 38%, stir and heat to 110±5℃, then add 120ml of formaldehyde solution with a mass fraction of 40±5%, and reflux at 110±5℃ for 2h. Finally, stir at room temperature to obtain organic phosphonic acid. The molar ratio of phosphorous acid to octylamine is 2:1.

[0063] S2: dissolving a certain amount of zirconium oxychloride in distilled water to prepare a solution 1 with a concentration of 10%, dispersing a certain amount of octyl-N, N-dimethylphosphonic acid obtained in step S1 in distilled water to prepare a solution 2 with a concentration of 10%; heating solution 1 to 70°C, adding solution 2 under strong stirring, reacting for 100 hours, filtering the product, washing with deionized water to pH = 5-6, and drying for 48 hours to obtain octyl-N, N-dimethylphosphonic acid zirconium product. The molar ratio of octyl-N, N-dimethylphosphonic acid to zirconium oxychloride is 1:1.

[0064] (2) A certain amount of octyl-N, N-dimethylphosphonic acid zirconium and deionized water are prepared into a 10wt% suspension, and then a certain amount of a platinum-containing compound with a mass concentration of 10% is added and mixed. After adjusting the pH value, the mixture is heated at 70°C for 4 hours, filtered, washed and dried after the reaction to obtain solid A; the molar ratio of octyl-N, N-dimethylphosphonic acid to the platinum-containing compound is 10:2, the platinum-containing compound is chloroplatinic acid, and the pH value is adjusted to 7-8.

[0065] (3) The solid A is calcined to obtain the platinum-supported organic zirconium phosphonate. The calcination temperature is 600° C. and the calcination time is 6 hours.

[0066] (2) Preparation of platinum-loaded zirconium organic phosphonate masterbatch. The preparation of platinum-loaded zirconium organic phosphonate masterbatch is carried out using platinum-loaded zirconium organic phosphonate 2 as raw material. The preparation method is as follows:

[0067] Platinum-loaded zirconium organic phosphonate masterbatch 1: The mass percentage of platinum-loaded zirconium organic phosphonate in the platinum-loaded zirconium organic phosphonate masterbatch is 16%. The preparation method is as follows: Take 16 parts of platinum-loaded zirconium organic phosphonate 2 and 84 parts of polypropylene melt-blown material 1, mix them evenly in proportion, add them into a twin-screw extruder, and after melting, extrusion, drawing, granulation and drying, the platinum-loaded zirconium organic phosphonate masterbatch is obtained. The extrusion temperature is 225°C.

[0068] The only difference between the preparation method of platinum-loaded zirconium organic phosphonate masterbatch 2 and the preparation method of platinum-loaded zirconium organic phosphonate masterbatch 1 is that 32 parts of platinum-loaded zirconium organic phosphonate 2 and 68 parts of polypropylene melt-blown material 1 are used for preparation. The only difference between the preparation method of platinum-loaded zirconium organic phosphonate masterbatch 3 and the preparation method of platinum-loaded zirconium organic phosphonate masterbatch 1 is that 10 parts of platinum-loaded zirconium organic phosphonate 2 and 90 parts of polypropylene melt-blown material 1 are used for preparation.

[0069] The only difference between the preparation method of the platinum-loaded zirconium organic phosphonate masterbatch 4 and the preparation method of the platinum-loaded zirconium organic phosphonate masterbatch 1 is that 40 parts of platinum-loaded zirconium organic phosphonate 2 and 60 parts of polypropylene melt-blown material 1 are used for preparation.

[0070] Examples and Comparative Examples

[0071] The components and weight proportions of the melt-blown polypropylene composite materials of the embodiments and comparative examples of the present invention are shown in Table 1 and Table 2. The preparation method of the melt-blown polypropylene composite materials of the embodiments and comparative examples comprises the following steps:

[0072] (1) Weigh various components according to the ratio;

[0073] (2) mixing the components in step (1) to obtain a mixture A;

[0074] (3) conveying the mixture A obtained in step (2) to a screw extruder for extrusion granulation to obtain the melt-blown polypropylene composite material.

[0075] Table 1

[0076]

[0077] Table 2

[0078]

[0079]

[0080] Performance Testing

[0081] The melt-blown polypropylene composite material prepared in the examples of the present invention and the comparative examples was subjected to the following operations:

[0082] S1: The melt-blown polypropylene composite material is added into a screw extruder for melt extrusion, the melt temperature is 240-250°C, the temperature of the screen changer and the metering pump is 230-240°C, the mesh number of the screen changer is 30+500+300+80 mesh; the melt pipe temperature is 245-245-245°C;

[0083] S2: After plasticization and homogenization, it enters the spinning assembly. The spinning assembly is composed of a die head and a spinneret. The temperature of each zone of the die head is set at 250-260°C and fine-tuned according to the gram weight of each zone. The fibers ejected from the spinning assembly are formed into fibers under hot air drafting. The hot air temperature is set at 240-260°C.

[0084] S3: Collect and form a web. The fibers stretched by hot air flow are sprayed onto a mesh curtain or a roller metal net to form a fiber web.

[0085] S4: Electrostatic charging. The charging voltage is greater than 50 kV and the charging distance is 8 to 10 cm.

[0086] S5: Slitting and winding.

[0087] S6: Filtration efficiency and antibacterial performance test.

[0088] Filtration efficiency test: TSI 8130A was used for testing, flow rate 32L / min, aerosol type NaCl, 0.3um, test area 100cm 2 . Filtration efficiency requirement: when the resistance is 20-25pa, 0.3umPFE≥92%.

[0089] Antibacterial performance test: Referring to GB / T 20944.3 2008 Part 3 Oscillation Method, the treatment time is stipulated to be 18h, and the inhibition rate of Klebsiella pneumoniae is greater than 95%, which has antibacterial effect.

[0090] Formaldehyde removal efficiency test: refer to GBT 18801-2015 Air Purifier at 3m 3 In the test chamber, test 1m 2 The initial concentration of formaldehyde in the antibacterial and formaldehyde-removing meltblown cloth is (1±0.2) mg / m 3 The 1-hour removal efficiency is stipulated in the regulation that materials with a 1-hour removal efficiency greater than 90% have formaldehyde removal effects.

[0091] The test results are shown in Tables 3 and 4.

[0092] Table 3 Test items and data of the embodiment

[0093]

[0094] Table 4 Comparative test items and data

[0095]

[0096] Examples 1 to 7 show that after adding platinum-loaded zirconium phosphonate, the antibacterial rate and 1-hour formaldehyde removal rate of the material are significantly improved, and the best effect is achieved when the platinum loading is 3.5%-4.5%, followed by 5.5%-6.5%.

[0097] It can be seen from Example 2 and Examples 8-9 that the comprehensive effect of the product obtained is better when the platinum-loaded zirconium organic phosphonate masterbatch is used for preparation; it can be seen from Examples 8-11 that the mass percentage of platinum-loaded zirconium organic phosphonate in the platinum-loaded zirconium organic phosphonate masterbatch will also affect the performance of the product, and it is further preferred that the mass percentage of platinum-loaded zirconium organic phosphonate in the platinum-loaded zirconium organic phosphonate masterbatch is 16-32%, and the effect is better.

[0098] It is found in Examples 1, 2 and Comparative Example 5 that when the electret masterbatch exceeds 3%, the filtration efficiency of the material does not change significantly, but when it is less than 3%, the filtration efficiency decreases significantly, which is mainly due to the insufficient electret content in the electret masterbatch. When the electret content is saturated, the amount of charge contained is also close to saturation, so increasing the electret masterbatch content cannot infinitely improve the electrostatic electret effect, and the filtration efficiency will not increase significantly.

[0099] Comparative Examples 1 and 2 show that platinum-loaded zirconium phosphates with different groups exhibit different antibacterial and formaldehyde-removing properties. The present invention finds that the antibacterial and formaldehyde-removing effects of alkyl chains are significantly inferior to those of p-aminobenzoic acid.

[0100] Comparative Examples 3 and 4 show that when the content of platinum-supported zirconium organic phosphonate is low, the antibacterial and formaldehyde removal effect is reduced, mainly due to insufficient content of the active ingredient. When the addition amount is too high, it is found in the production process that the spinneret frequently becomes blocked and a stable material flow cannot be formed, resulting in the phenomenon of "crystal points". Based on this abnormality, we speculate that when the content is too high, some platinum-supported zirconium organic phosphonate may have agglomerated and unevenly dispersed, resulting in uneven local testing.

[0101] Comparison 6 shows that when no platinum-loaded zirconium phosphonate is added, the material has no antibacterial effect, and the formaldehyde removal efficiency is only 0.6% in 1 hour, indicating that the platinum-loaded organic zirconium phosphonate has good antibacterial and formaldehyde removal effects.

[0102] Comparison 7 shows that when no stabilizing masterbatch is added, the material filtration efficiency is only 20-30%.

[0103] Comparison 8 shows that the comprehensive effect of the platinum-loaded organic zirconium phosphonate added in the present invention is significantly better than that of the silver-loaded organic zirconium phosphonate.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A melt-blown polypropylene composite material, characterized in that: The invention comprises the following components in parts by weight: 90-94 parts of polypropylene meltblown material, 3-5 parts of platinum-loaded organic zirconium phosphonate, and 3-5 parts of electret masterbatch; The content of platinum in the platinum-supported organic zirconium phosphonate is 3.5wt%-6.5wt%; The preparation method of the platinum-supported organic zirconium phosphonate comprises the following steps: (1) mixing p-aminobenzoic acid-N, N-dimethylphosphonic acid zirconium, water, and a platinum-containing compound, adjusting the pH value, heating, and performing post-reaction treatment to obtain a solid A; (2) calcining the solid A to obtain the platinum-supported organic zirconium phosphonate; In the step (1), the platinum-containing compound is at least one of chloroplatinic acid, potassium chloroplatinate, platinum acetylacetonate, sodium chloroplatinate, ammonium chloroplatinate, platinum tetrachloride, and potassium tetrachloroplatinate; In the step (1), the pH value is adjusted to 7-13; In the step (2), the calcination temperature is 600-700°C.

2. The melt-blown polypropylene composite material according to claim 1, characterized in that The platinum-loaded zirconium organic phosphonate is added in the form of platinum-loaded zirconium organic phosphonate masterbatch.

3. The melt-blown polypropylene composite material according to claim 2, characterized in that: The mass percentage of the platinum-supported organic zirconium phosphonate in the platinum-supported organic zirconium phosphonate masterbatch is 16-32%.

4. The melt-blown polypropylene composite material according to claim 2, characterized in that: The preparation method of the platinum-loaded zirconium organic phosphonate masterbatch is as follows: 68-84 parts of polypropylene melt-blown material and 16-32 parts of platinum-loaded zirconium organic phosphonate are uniformly mixed according to a certain proportion, added into a twin-screw extruder for melt extrusion, drawing, granulation and drying to obtain the platinum-loaded zirconium organic phosphonate masterbatch.

5. The melt-blown polypropylene composite material according to claim 1, characterized in that: Contains at least one of the following (a)-(c): (a) In step (1), the mass ratio of p-aminobenzoic acid-N,N-dimethylphosphonic acid zirconium, water, and the platinum-containing compound is p-aminobenzoic acid-N,N-dimethylphosphonic acid zirconium: water: platinum-containing compound = (1-1.5): 10: (1-2); (b) In step (1), the heating time is 3 to 5 hours; (c) In step (2), the calcination time is 4-6 hours.

6. The melt-blown polypropylene composite material according to claim 1, characterized in that: In the step (1), the pH value is adjusted to 7-8.

7. The method for preparing the melt-blown polypropylene composite material according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Weigh various components according to the ratio; (2) mixing the components in step (1) to obtain a mixture A; (3) The mixture A obtained in step (2) is conveyed to a screw extruder for extrusion granulation to obtain the melt-blown polypropylene composite material.

8. Use of the melt-blown polypropylene composite material according to any one of claims 1 to 6 in the fields of medicine, health and food packaging.

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