Polypropylene composite material as well as preparation method and application thereof
By combining silver-carrying activated carbon and various forms of silver materials in polypropylene composite materials, the problem of degradation of existing antibacterial and mildew-proof materials after aging is solved, and the effect of maintaining excellent antibacterial and mildew-proof performance after aging is achieved. It is suitable for new energy vehicles and other fields.
Patent Information
- Application Number
- CN202510281845.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2025-06-27
AI Technical Summary
The antibacterial and mildew-proof materials have significantly decreased their antibacterial and mildew-proof properties after aging, making it difficult to meet the needs of new energy vehicles and other fields for heat resistance.
Polypropylene composite materials are used to combine silver-carrying activated carbon with various forms of silver materials (such as nanosilver powder, spherical silver powder, sheet silver powder, silver nanowires) to form a synergistic antibacterial effect, and improve the antibacterial and anti-mold properties of the material.
It still maintains excellent antibacterial and mildew resistance after aging. It is suitable for the preparation of automotive parts and household appliances, significantly improving the heat resistance of the material.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a polypropylene composite material, a preparation method thereof, and an application thereof. Background Art
[0002] With the strong rise of new energy vehicles, there are more and more functional requirements for parts. Especially in terms of health and environmental protection, the demand of domestic brands is more urgent. Therefore, the requirements for antibacterial and mildew-proof materials have emerged, and on the basis of the household field, the special requirements of the automotive industry are integrated, posing new challenges to the application of antibacterial agents. Such as meeting the heat resistance performance of automotive interiors.
[0003] Currently, there are few antibacterial and mildew-proof materials that can meet the aging requirements. After long-term aging, the antibacterial and mildew-proof properties of the materials decline significantly, causing great loss to the health functions of the parts. Therefore, it has great application value to develop a polypropylene material with stable antibacterial and mildew-proof properties after heat resistance.
[0004] In view of this, the present application is proposed. Summary of the Invention
[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a polypropylene composite material, a preparation method thereof, and an application thereof. The polypropylene composite material has excellent antibacterial and mildew-proof properties and still has excellent antibacterial and mildew-proof properties after aging.
[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:
[0007] A polypropylene composite material, comprising the following components in parts by weight: 38 - 92 parts of polypropylene resin, 4 - 32 parts of polyolefin elastomer, 0.4 - 2.1 parts of silver-loaded activated carbon, 0.4 - 2.1 parts of antibacterial agent, 9 - 32 parts of filler, 0.08 - 1.1 parts of antioxidant, and 0.18 - 0.52 parts of dispersant;
[0008] The antibacterial agent includes at least one of nano silver powder, spherical silver powder, flaky silver powder, and silver nanowires.
[0009] The present invention creatively combines the above raw materials. With polypropylene resin as the matrix, on the premise of adding polyolefin elastomer, filler, antioxidant, and dispersant, under the combined action of silver-loaded activated carbon and antibacterial agent, the antibacterial and mildew-proof properties of the polypropylene composite material are effectively improved, and it still has excellent antibacterial and mildew-proof properties after aging. The polypropylene composite material is very suitable for preparing automotive parts and household appliances.
[0010] In the present invention, silver-loaded activated carbon is creatively combined with at least one of silver nanopowder, spherical silver powder, flaky silver powder, and silver nanowires as the antibacterial active ingredient. Different forms of silver can improve its stability, avoid agglomeration, prevent silver inactivation, enhance the uniformity of silver distribution in the system, and increase the contact efficiency with microorganisms. The silver-loaded activated carbon combines with various silver materials to form a synergistic antibacterial effect, achieving efficient and long-lasting antibacterial and antifungal properties, which can effectively improve antibacterial and antifungal performance, especially still having excellent antibacterial and antifungal properties after aging.
[0011] Among them, the dosage of the polypropylene resin is 38 to 92 parts, for example, it can be 38 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 92 parts, or the range composed of any two of these values.
[0012] Preferably, the dosage of the polypropylene resin is 40 to 90 parts.
[0013] Among them, the dosage of the polyolefin elastomer is 4 to 32 parts, for example, it can be 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 32 parts, or the range composed of any two of these values.
[0014] Preferably, the dosage of the polyolefin elastomer is 10 to 30 parts.
[0015] Among them, the dosage of the silver-loaded activated carbon is 0.4 to 2.1 parts, for example, it can be 0.4 parts, 0.5 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.1 parts, or the range composed of any two of these values.
[0016] Preferably, the dosage of the silver-loaded activated carbon is 0.5 to 2 parts.
[0017] Among them, the dosage of the antibacterial agent is 0.4 to 2.1 parts, for example, it can be 0.4 parts, 0.5 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.1 parts, or the range composed of any two of these values.
[0018] Preferably, the dosage of the antibacterial agent is 0.5 to 2 parts.
[0019] Among them, the dosage of the filler is 9 to 32 parts, for example, it can be 9 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 32 parts, or the range composed of any two of these values.
[0020] Preferably, the dosage of the filler is 10 to 30 parts.
[0021] Among them, the dosage of the antioxidant is 0.08 to 1.1 parts, for example, it can be 0.08 parts, 0.1 part, 0.2 part, 0.4 part, 0.8 part, 1 part, 1.1 part or the range composed of any two of these values.
[0022] Preferably, the dosage of the antioxidant is 0.1 to 1 part.
[0023] Among them, the dosage of the dispersant is 0.18 to 0.52 parts, for example, it can be 0.18 parts, 0.2 part, 0.25 part, 0.3 part, 0.4 part, 0.5 part, 0.52 part or the range composed of any two of these values.
[0024] Preferably, the dosage of the dispersant is 0.2 to 0.5 part.
[0025] Preferably, the sum of the weights of the silver-loaded activated carbon and the antibacterial agent accounts for 0.2 to 4% of the total weight of the polypropylene composite material, for example, it can be 0.2%, 0.4%, 0.5%, 0.8%, 1%, 1.5%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4% or the range composed of any two of these values.
[0026] Preferably, the sum of the weights of the silver-loaded activated carbon and the antibacterial agent accounts for 0.4 to 2% of the total weight of the polypropylene composite material.
[0027] Preferably, the weight ratio of the silver-loaded activated carbon to the antibacterial agent is 1:(0.25 to 4), for example, it can be 1:0.25, 1:0.5, 1:1, 1:2, 1:3, 1:4 or the range composed of any two of these values.
[0028] Preferably, in the polypropylene composite material of the present invention, the weight percentage of the polypropylene resin is 38 to 84%, for example, it can be 38%, 40%, 50%, 60%, 70%, 80%, 84% or the range composed of any two of these values.
[0029] Preferably, the melt flow rate of the polypropylene resin under the conditions of 230°C / 2.16 kg is 10 to 120 g / 10 min, for example, it can be 10 g / 10 min, 20 g / 10 min, 30 g / 10 min, 40 g / 10 min, 50 g / 10 min, 60 g / 10 min, 70 g / 10 min, 80 g / 10 min, 90 g / 10 min, 100 g / 10 min, 110 g / 10 min, 120 g / 10 min or the range composed of any two of these values.
[0030] Preferably, the melt flow rate of the polypropylene resin under the conditions of 230°C / 2.16 kg is 30 to 100 g / 10 min.
[0031] Among them, polyolefin elastomer (abbreviated as POE) is a thermoplastic elastomer obtained by in-situ polymerization of ethylene and α-olefin through a catalyst, where the α-olefin includes at least one of α-olefins with 4 to 8 carbon atoms.
[0032] Preferably, the α-olefin includes at least one of 1-butene, 1-hexene, and 1-octene.
[0033] Furthermore, the polyolefin elastomer is preferably a thermoplastic elastomer obtained by in-situ polymerization of ethylene and 1-octene catalyzed by a metallocene catalyst.
[0034] Preferably, the melt index of the polyolefin elastomer under the conditions of 190 °C and 2.16 kg is 0.5 to 30 g / 10 min, for example, it can be 0.5 g / 10 min, 1 g / 10 min, 2 g / 10 min, 5 g / 10 min, 10 g / 10 min, 12 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, or the range composed of any two of these values.
[0035] Preferably, the melt index of the polyolefin elastomer under the conditions of 190 °C and 2.16 kg is 5 to 20 g / 10 min.
[0036] Preferably, the polypropylene material includes the following components in parts by weight: 38 to 92 parts of polypropylene resin, 4 to 32 parts of polyolefin elastomer, 0.4 to 2.1 parts of silver-loaded activated carbon, 0.4 to 2.1 parts of antibacterial agent, 9 to 32 parts of filler, 0.08 to 1.1 parts of antioxidant, and 0.18 to 0.52 parts of dispersant.
[0037] Preferably, the polypropylene material includes the following components in parts by weight: 50 to 70 parts of polypropylene resin, 10 to 20 parts of polyolefin elastomer, 1 to 1.5 parts of silver-loaded activated carbon, 1 to 1.5 parts of antibacterial agent, 20 to 25 parts of filler, 0.4 to 0.8 parts of antioxidant, and 0.3 to 0.4 parts of dispersant. Especially when the dosage of each raw material is within this range, the mildew-proof performance and the antibacterial and mildew-proof performance after aging can be further improved.
[0038] Preferably, the content of silver element in the silver-loaded activated carbon is 0.5 to 4 wt%, for example, it can be 0.5 wt%, 0.6 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, or the range composed of any two of these values.
[0039] Among them, the silver-loaded activated carbon described in the present invention can be obtained by conventional commercial purchase, or the silver-loaded activated carbon can be prepared by a self-made method.
[0040] Exemplarily, the silver-loaded activated carbon can be prepared by an impregnation method, that is, the activated carbon is impregnated in a silver salt solution, so that silver is loaded on the activated carbon to obtain the silver-loaded activated carbon.
[0041] Among them, the silver salt solution can be at least one of silver nitrate solution and silver acetate solution.
[0042] Among them, the activated carbon can be at least one of coconut shell activated carbon, wood activated carbon, coal activated carbon, petroleum coke activated carbon, and regenerated activated carbon (recycled and regenerated waste activated carbon).
[0043] Exemplarily, the preparation method of the silver-loaded activated carbon includes the following steps:
[0044] (1) Put coconut shell powder into a vacuum muffle furnace with a vacuum degree of -0.06 MPa, heat-treat it at a temperature of 500 - 700 °C for 20 - 60 min, take it out and wait for it to cool, then obtain coconut shell activated carbon with a particle size of 1 - 10 μm after high-speed grinding and screening.
[0045] (2) Dissolve silver nitrate (or silver acetate) in pure water, add activated carbon, in a constant temperature water bath at 50 - 80 °C, first perform ultrasonic treatment for 4 - 10 min, then keep it in the dark and stand for 4 - 10 h, and finally dry and cool it to obtain silver-loaded activated carbon.
[0046] Among them, the mass ratio of the silver nitrate (or silver acetate) to the activated carbon is (5 - 50) : (60 - 90). By controlling the mass ratio of the silver nitrate (or silver acetate) to the activated carbon, the content of silver element in the silver-loaded activated carbon can be controlled.
[0047] Preferably, the antibacterial agent includes flaky silver powder and silver nanowires; the weight ratio of the flaky silver powder to the silver nanowires is 1 : (0.5 - 2), for example, it can be 1 : 0.5, 1 : 1, 1 : 1.5, 1 : 2 or the range composed of any two of these values. Especially when using a combination of flaky silver powder and silver nanowires as the antibacterial agent, the mildew-proof performance and the antibacterial and mildew-proof performance after aging can be further improved.
[0048] Preferably, the average particle size of the flaky silver powder is 0.8 - 15 μm, for example, it can be 0.8 μm, 1 μm, 2 μm, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm or the range composed of any two of these values.
[0049] Preferably, the average particle size of the flaky silver powder is 4 - 10 μm.
[0050] Preferably, the average particle size of the nano silver powder is 20 to 100 nm, for example, it can be 20 nm, 30 nm, 50 nm, 60 nm, 80 nm, 100 nm, or a range composed of any two of these values.
[0051] Preferably, the average particle size of the spherical silver powder is 0.2 to 5 μm, for example, it can be 0.2 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, or a range composed of any two of these values.
[0052] The average particle size mentioned in the present invention is obtained according to the test in accordance with GB / T 19077.
[0053] Preferably, the diameter of the silver nanowire is 20 to 40 nm, for example, it can be 20 nm, 22 nm, 25 nm, 28 nm, 30 nm, 32 nm, 35 nm, 38 nm, 40 nm, or a range composed of any two of these values.
[0054] Preferably, the diameter of the silver nanowire is 25 to 30 nm.
[0055] Preferably, the length of the silver nanowire is 15 to 25 μm, for example, it can be 15 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 25 μm, or a range composed of any two of these values.
[0056] In the present invention, the diameter and length of the silver nanowire are obtained by microscopic method: 100 silver nanowire samples are placed under a microscope for observation, the diameters and lengths of all silver nanowires in the samples are calculated, and the average value is calculated to obtain the diameter and length of the silver nanowire.
[0057] Preferably, the filler includes at least one of talc powder, calcium carbonate, wollastonite, and mica powder.
[0058] Preferably, the antioxidant includes at least one of thioester antioxidants, hindered phenol antioxidants, hydroxylamine antioxidants, phosphite antioxidants, and phosphate antioxidants.
[0059] Preferably, the thioester antioxidant includes at least one of dialkyl thiodipropionate or pentaerythritol tetrakis(3-laurylthiopropionate).
[0060] Preferably, the hindered phenol antioxidant includes at least one of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, ethylene bis(oxyethylene) bis[3-(5-tert-butyl-4-hydroxy-m-tolyl) propionate], or 3,9-bis[1,1-dimethyl-2-[(3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane.
[0061] Preferably, the hydroxylamine antioxidant includes bis(octadecyl) hydroxylamine.
[0062] Preferably, the phosphite antioxidant includes at least one of tris(2,4-di-tert-butylphenyl) phosphite and pentaerythritol bis(di-2,4-tert-butylphenyl) diphosphite.
[0063] Preferably, the phosphate antioxidant includes bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate.
[0064] Preferably, the dispersant includes at least one of ethylene bisstearamide, erucamide, and fatty acid esters.
[0065] The polypropylene composite material of the present invention may include a toughening agent, and suitable toughening agents include, but are not limited to, ethylene-octene copolymer, maleic anhydride grafted POE, maleic anhydride grafted SEBS, and combinations thereof.
[0066] The polypropylene composite material of the present invention may include a colorant, and suitable colorants include, but are not limited to, carbon black, titanium dioxide, zinc sulfide, iron oxide red, titanium yellow, and combinations thereof.
[0067] The polypropylene composite material of the present invention may include a lubricant, and suitable lubricants include, but are not limited to, polyethylene wax, hyperbranched amide, and combinations thereof.
[0068] The polypropylene composite material of the present invention may include a weathering agent, and suitable weathering agents include, but are not limited to, hindered amine light stabilizers and combinations thereof.
[0069] The polypropylene composite material of the present invention may include an antistatic agent, and suitable antistatic agents include, but are not limited to, zinc oxide, manganese dioxide, chromium trioxide, and combinations thereof.
[0070] The polypropylene composite material described in the present invention may include flame retardants. Suitable flame retardants include, but are not limited to, brominated polymers (e.g., brominated polystyrene), metal dialkyl phosphites (e.g., aluminum tris(diethyl phosphite)), metal hydroxides (e.g., magnesium hydroxide), aromatic phosphates (e.g., resorcinol bis(diphenyl phosphate) and bisphenol A bis(diphenyl phosphate)), and combinations thereof.
[0071] The polypropylene composite material described in the present invention may include ultraviolet light absorbers. Suitable ultraviolet light absorbers include, but are not limited to, hydroxybenzophenones, benzotriazoles, hydroxybenzotriazines, cyanoacrylates, nanoscale inorganic materials (e.g., titanium oxide, cerium oxide, and zinc oxide), and combinations thereof.
[0072] The present invention also provides a method for preparing a polypropylene composite material, comprising the following steps:
[0073] Mix the raw materials evenly according to the ratio, melt-extrude and pelletize to obtain the polypropylene composite material.
[0074] The present invention also provides an application of the polypropylene composite material in the preparation of automotive parts and household appliances.
[0075] The beneficial effects of the present invention are as follows: The present invention uses polypropylene resin as the matrix, and under the combined action of silver-loaded activated carbon and antibacterial agents, effectively improves the antibacterial and antifungal properties of the polypropylene composite material, and still has excellent antibacterial and antifungal properties after aging. The described polypropylene composite material is very suitable for the preparation of automotive parts and household appliances. Detailed embodiments
[0076] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.
[0077] In the present application, among the technical features described in an open-ended manner, a closed technical solution composed of the listed features is included, and an open technical solution including the listed features is also included.
[0078] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are considered continuous and include the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when the range refers to integers, it includes each integer between the minimum and maximum values of the range. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.
[0079] The raw materials used in the examples and comparative examples are described as follows:
[0080] Polypropylene resin - 1: M30RHC, purchased from Zhenhai Refining & Chemical.
[0081] Polypropylene resin - 2: grade BX3920, purchased from SK of South Korea.
[0082] Polyolefin elastomer: grade POE8137, purchased from Dow Chemical.
[0083] Silver - loaded activated carbon - 1: silver element content is 2 wt%.
[0084] Silver - loaded activated carbon - 2: silver element content is 1 wt%.
[0085] Silver - loaded activated carbon - 3: silver element content is 4 wt%.
[0086] Silver - loaded activated carbon - 4: silver element content is 0.5 wt%.
[0087] Silver - loaded activated carbon - 5: silver element content is 2 wt%, grade PSD - Ag+S type, purchased from Jiangsu Pushida.
[0088] Among them, the preparation methods of silver - loaded activated carbon - 1 to 4 all include the following steps:
[0089] (1) Put coconut shell powder into a vacuum muffle furnace with a vacuum degree of -0.06 MPa, heat - treat it at a temperature of 600 °C for 30 min, take it out and wait for it to cool, then obtain coconut shell activated carbon with a particle size of 5 μm after high - speed grinding and screening.
[0090] (2) Dissolve silver nitrate in pure water, add coconut shell activated carbon, in a 60 °C constant - temperature water bath, first perform ultrasonic treatment for 5 min, then stand in the dark for 8 h, and finally dry and cool it to obtain self - made silver - loaded activated carbon - 1 to 4.
[0091] By controlling the ratio of silver nitrate to coconut shell activated carbon, the silver element content in the silver - loaded activated carbon is controlled to obtain silver - loaded activated carbon 1 to 4 with different silver contents.
[0092] Flaky silver powder - 1: The average particle size is 4 - 5μm, grade YM-Ag-05P, purchased from Yumu (Ningbo) New Materials.
[0093] Flaky silver powder - 2: The average particle size is 10μm, grade YM-Ag-10P, purchased from Yumu (Ningbo) New Materials.
[0094] Flaky silver powder - 3: The average particle size is 0.8 - 1μm, grade YM-Ag-01P, purchased from Yumu (Ningbo) New Materials.
[0095] Flaky silver powder - 4: The average particle size is 15μm, grade YM-Ag-15P, purchased from Yumu (Ningbo) New Materials.
[0096] Silver nanowire - 1: The diameter is 25nm, the length is 15μm, grade YM-Ag-25M, purchased from Yumu (Ningbo) New Materials.
[0097] Silver nanowire - 2: The diameter is 30nm, the length is 25μm, grade YM-Ag-30M, purchased from Yumu (Ningbo) New Materials.
[0098] Silver nanowire - 3: The diameter is 40nm, the length is 15μm, grade YM-Ag-20M, purchased from Yumu (Ningbo) New Materials.
[0099] Silver nanowire - 4: The diameter is 40nm, the length is 25μm, grade YM-Ag-40M, purchased from Yumu (Ningbo) New Materials.
[0100] Spherical silver powder: The average particle size is 5μm, grade YM-Ag-05W, purchased from Yumu (Ningbo) New Materials.
[0101] Nano silver powder: The average particle size is 100nm, grade YM-Ag-100N, purchased from Yumu (Ningbo) New Materials.
[0102] Filler - 1: Talc powder, grade TYT-777A, purchased from Beihai Group.
[0103] Filler - 2: Wollastonite powder, grade SYW-XA, purchased from Siyuan Mining.
[0104] Antioxidant - 1: A mixture of antioxidant 4426-S and antioxidant 168, and the mass ratio of the two is 1:1.
[0105] Antioxidant - 2: A mixture of antioxidant 1010 and antioxidant 168, and the mass ratio of the two is 1:1.
[0106] Dispersant - 1: Ethylene bisstearamide, commercially available.
[0107] Dispersant - 2: Erucamide, commercially available.
[0108] Unless otherwise specified, the component raw materials used in the embodiments and comparative examples of the present invention are all commercially available raw materials, and the component raw materials used in each parallel experiment are of the same kind.
[0109] Examples 1-22, Comparative Examples 1-4
[0110] The formulations of the polypropylene composites of Examples 1-22 and Comparative Examples 1-4 are shown in Tables 1 and 2 (all in parts by weight).
[0111] Among them, the preparation methods of the polypropylene composites of Examples 1-22 and Comparative Examples 1-4 all include the following steps:
[0112] According to the ratio, place each raw material in a high-speed mixer and mix at a speed of 400 r / min for 5 minutes to obtain a premix, and then put it into a twin-screw extruder (aspect ratio is 40:1) for melt mixing. The processing temperatures are: zone 1 is 170 °C, zone 2 is 190 °C, zone 3 is 210 °C, zone 4 is 210 °C, zone 5 is 210 °C, zone 6 is 210 °C, zone 7 is 220 °C, zone 8 is 220 °C, zone 9 is 220 °C, and then extrude and pelletize to obtain the polypropylene composite.
[0113] Table 1
[0114]
[0115] Table 2
[0116]
[0117]
[0118] Performance Test
[0119] Make the polypropylene composites of the examples and comparative examples into 100*100 mm samples for testing.
[0120] Antibacterial performance: Tested with reference to the standard GB / T 31402-2015, and the test strain is Staphylococcus aureus.
[0121] Mildew-proof performance: Tested with reference to the standard GB / T 24128-2009, and the mold species used is Aspergillus niger.
[0122] Antibacterial performance after thermal aging: Conduct thermal aging at 90 °C for 1000 h, and then test the antibacterial performance and mildew-proof performance.
[0123] Table 3
[0124]
[0125] As can be seen from Table 3, the polypropylene composite material described in the present invention has excellent antibacterial and anti-mildew properties, and still has excellent antibacterial and anti-mildew properties after aging. The antibacterial rate of Staphylococcus aureus of the polypropylene composite material is > 99.9%, the antibacterial rate of Staphylococcus aureus after thermal aging is ≥ 88%, the anti-mildew grade is ≤ 1 level, and the anti-mildew grade after thermal aging is ≤ 2 levels. By comparing Example 2 with Comparative Examples 1 to 4, it can be seen that by using the combined action of the silver-loaded activated carbon and the antibacterial agent described in the present invention, the antibacterial and anti-mildew properties of the polypropylene composite material can be effectively improved. Especially after aging, the retention rates of its antibacterial and anti-mildew properties are relatively high, which can effectively reduce the influence on the application performance after aging and can maintain the long-term effectiveness of the antibacterial and anti-mildew functions.
[0126] By comparing Examples 1 to 4, it can be seen that by controlling the amounts of each raw material in the present invention as follows: 50 - 70 parts of polypropylene resin, 10 - 20 parts of polyolefin elastomer, 1 - 1.5 parts of silver-loaded activated carbon, 1 - 1.5 parts of antibacterial agent, 20 - 25 parts of filler, 0.4 - 0.8 parts of antioxidant, and 0.3 - 0.4 parts of dispersant, the anti-mildew property and the antibacterial and anti-mildew properties after aging can be further improved.
[0127] By comparing Example 2 with Examples 6 to 8, it can be seen that by controlling the silver element content in the silver-loaded activated carbon to be 1 - 2 wt%, the anti-mildew property and the antibacterial and anti-mildew properties after aging can be further improved. The applicant speculates that this may be because the activated carbon has a variety of pore structures and a large specific surface area and can load silver. When the loading amount is too much, it may lead to pore blocking, and then silver is more likely to agglomerate in the pores and on the surface of the activated carbon. Thermal aging will cause silver loss and further exacerbate the agglomeration tendency, thus resulting in the difference in effects.
[0128] By comparing Example 2 with Examples 10 to 12, it can be seen that by controlling the average particle size of the flaky silver powder to be 4 - 10 μm, the anti-mildew property and the antibacterial and anti-mildew properties after aging can be further improved.
[0129] Comparing Comparative Example 2 with Examples 13 to 15, it can be seen that by controlling the diameter of the silver nanowires to be 20 to 40 nm and the length to be 15 to 25 μm, the mildew-proof performance, as well as the antibacterial performance and mildew-proof performance after aging, can be further improved. Comparing Comparative Example 2 with Examples 17 to 22, it can be seen that by controlling the use of flaky silver powder and silver nanowires with a weight ratio of 1:(0.5 to 2) as antibacterial agents, the mildew-proof performance, as well as the antibacterial performance and mildew-proof performance after aging, can be further improved; among them, the antibacterial effects of the flaky silver powder and silver nanowires are significantly correlated with their dispersibility in the system. By using flaky silver powder and silver nanowires with a weight ratio of 1:(0.5 to 2) as antibacterial agents, the phenomenon of agglomeration can be more effectively avoided, and at the same time, the agglomeration caused by the mutual attraction and aggregation of particles during the heat treatment process can be more effectively avoided.
[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.
Claims
1. A polypropylene composite material, characterized in that: The invention comprises the following components in parts by weight: 38 to 92 parts of polypropylene resin, 4 to 32 parts of polyolefin elastomer, 0.4 to 2.1 parts of silver-loaded activated carbon, 0.4 to 2.1 parts of antibacterial agent, 9 to 32 parts of filler, 0.08 to 1.1 parts of antioxidant, and 0.18 to 0.52 parts of dispersant; The antibacterial agent comprises at least one of nano silver powder, spherical silver powder, flaky silver powder and silver nanowire.
2. The polypropylene composite material according to claim 1, characterized in that: The content of silver element in the silver-loaded activated carbon is 0.5-4wt%.
3. The polypropylene composite material according to claim 1, characterized in that: The antibacterial agent comprises flaky silver powder and silver nanowires; the weight ratio of the flaky silver powder to the silver nanowires is 1:(0.5-2).
4. The polypropylene composite material according to claim 3, characterized in that: The average particle size of the flaky silver powder is 0.8 to 15 μm.
5. The polypropylene composite material according to claim 3, characterized in that: The diameter of the silver nanowire is 20-40 nm, and the length is 15-25 μm.
6. The polypropylene composite material according to claim 1, characterized in that: The filler includes at least one of talc powder, calcium carbonate, wollastonite and mica powder.
7. The polypropylene composite material according to claim 1, characterized in that: The antioxidant includes at least one of a thioester antioxidant, a hindered phenol antioxidant, a hydroxylamine antioxidant, a phosphite antioxidant, and a phosphate antioxidant.
8. The polypropylene composite material according to claim 1, characterized in that: The dispersant includes at least one of ethylene bisstearamide, erucic acid amide and fatty acid ester.
9. The method for preparing the polypropylene composite material according to any one of claims 1 to 8, characterized in that: The following steps are involved: According to the proportion, the raw materials are evenly mixed, melt-extruded and granulated to obtain a polypropylene composite material.
10. Use of the polypropylene composite material according to any one of claims 1 to 8 in the preparation of automobile parts and household appliances.