Oleophobic polypropylene composite material as well as preparation method and application thereof

Abstract

The invention relates to an oleophobic polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of compositions of high-molecular compounds. The oleophobic polypropylene composite material is prepared from the following components in parts by weight: 39 to 96 parts of polypropylene resin, 5 to 20 parts of a toughening agent, 5 to 35 parts of inorganic filler, 0.5 to 5 parts of an oleophobic agent and 0.05 to 0.8 part of an initiator, the oleophobic agent is mainly prepared from maleic anhydride, aminoalkyl silane and nano silicon dioxide. The oleophobic polypropylene composite material has excellent long-acting oleophobicity and good mechanical properties.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high molecular compound composition, in particular to an oil-repellent polypropylene composite material and a preparation method and application thereof. BACKGROUND

[0002] Polypropylene is widely used in the fields of automobile, electronic appliances and daily necessities due to its excellent mechanical properties, good chemical stability, low density and low cost. However, polypropylene lacks effective repelling ability to low surface tension oil liquid due to its non-polar molecular chain and low surface energy, which leads to oil stain pollution of polypropylene products in the application process, thereby affecting the appearance and durability of high-end electronics, automotive interiors and household appliances. At present, the surface oil-repellent performance of polypropylene is mainly improved by coating modification, surface grafting modification and blending modification. Among them, coating modification and surface grafting modification mainly construct an oil-repellent layer on the surface of polypropylene parts to achieve oil-repellent effect, but the oil-repellent layer formed by this method is easy to be worn or peeled off in the actual application process, which leads to significant attenuation of the long-term oil-repellent performance of polypropylene parts. Blending modification is to melt blend fluorine-containing polymers or silane-based low surface energy additives with polypropylene to improve the oil-repellent property of the surface of polypropylene, but the environmental friendliness of fluorine-containing polymers is poor, and the migration of silane-based low surface energy additives leads to poor long-term oil-repellent property of polypropylene parts. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide an oil-repellent polypropylene composite material and a preparation method and application thereof.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: In a first aspect, the present application provides an oil-repellent polypropylene composite material, which comprises the following components in parts by weight: 39-96 parts of polypropylene resin, 5-20 parts of toughening agent, 5-35 parts of inorganic filler, 0.5-5 parts of oil-repellent agent and 0.05-0.8 parts of initiator; the oil-repellent agent is mainly composed of maleic anhydride, aminoalkylsilane and nano-silicon dioxide.

[0005] The present application takes maleic anhydride, aminoalkylsilane and nanosilica as main components to form an oil-repellent agent. During the melt blending of the components, maleic anhydride is grafted to the polypropylene molecular chain under the action of an initiator to form polypropylene grafted maleic anhydride. Meanwhile, the anhydride functional group in the polypropylene grafted maleic anhydride is amidated with the amino group (-NH2) in the aminoalkylsilane to form a firm covalent bond. The siloxane group in the aminoalkylsilane can be hydrolyzed to form a silicon hydroxyl group (Si-OH), which can anchor the nanosilica and promote the uniform dispersion of the nanosilica in the polypropylene resin. A structure similar to that of polypropylene molecular chain as "root", alkyl chain as "leaf" and nanosilica as "fruit" is formed. The nanosilica provides micro-nano composite roughness, and the grafted alkyl chain provides low surface energy. The two work together to improve the long-acting oil-repellent performance of the polypropylene composite material. Moreover, the grafted groups on the polypropylene molecular chain can enhance the interfacial bonding performance of the polypropylene resin with the toughening agent and inorganic filler, promote the uniform dispersion of the inorganic filler, and synergistically work with the nanosilica dispersed at the nanoscale, so that the polypropylene composite material has good mechanical properties.

[0006] The polypropylene resin is the base resin of the oil-repellent polypropylene composite material. The mass fraction of the polypropylene resin in the oil-repellent polypropylene composite material is 35% or more.

[0007] In some embodiments, the weight fraction of the polypropylene resin in the oil-repellent polypropylene composite material can be, but is not limited to, 39 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts, 66 parts, 68 parts, 70 parts, 72 parts, 74 parts, 76 parts, 78 parts, 80 parts, 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 95 parts or 96 parts, or within a range formed by any two of the above values.

[0008] In some embodiments, the weight fraction of the toughening agent in the oil-repellent polypropylene composite material can be, but is not limited to, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts, or within a range formed by any two of the above values.

[0009] In some embodiments, the weight fraction of the inorganic filler in the oil-repellent polypropylene composite material can be, but is not limited to, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts or 35 parts, or within a range formed by any two of the above values.

[0010] In some embodiments, the weight fraction of the oil-repellent agent in the oil-repellent polypropylene composite can be, but is not limited to, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts, or within a range between any two of the above-mentioned values. The mass fraction of the oil-repellent agent in the oil-repellent polypropylene composite is 0.5% to 5%.

[0011] In some embodiments, the weight fraction of the initiator in the oil-repellent polypropylene composite can be, but is not limited to, 0.05 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts, or 0.8 parts, or within a range between any two of the above-mentioned values.

[0012] In some embodiments, the initiator includes, but is not limited to, at least one of benzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, di-(tert-butylperoxy isopropyl) benzene, 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane, tert-butyl peroxy-3,5,5-trimethylhexanoate, 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane, and azobisisobutyronitrile.

[0013] In some embodiments, the inorganic filler includes, but is not limited to, at least one of talc, kaolin, montmorillonite, glass fiber powder, mica, quartz, feldspar, palygorskite, zeolite, and perlite.

[0014] As a preferred embodiment of the oil-repellent polypropylene composite of the present application, the molar ratio of maleic anhydride to amino group in the aminoalkylsilane in the oil-repellent agent is ≤1:0.4, and the mass ratio of the aminoalkylsilane to the nanosilica is ≥1:8.

[0015] As a preferred embodiment of the oil-repellent polypropylene composite of the present application, the molar ratio of maleic anhydride to amino group in the aminoalkylsilane is 1:0.5 to 1:1.2, which can be, but is not limited to, 1:0.5, 1:0.55, 1:0.6, 1:0.65, 1:0.7, 1:0.75, 1:0.8, 1:0.85, 1:0.9, 1:0.95, 1:1, 1:1.15, or 1:2, or within a range between any two of the above-mentioned values. The molar ratio of maleic anhydride to amino group in the aminoalkylsilane within the above-mentioned range can better promote the complete reaction of maleic anhydride and aminoalkylsilane, so as to reduce the presence of free aminoalkylsilane in the polypropylene composite, to reduce the migration and precipitation of the aminoalkylsilane, and thus better improve the long-term oil-repellent performance of the polypropylene composite.

[0016] As a preferred embodiment of the oil-repellent polypropylene composite material according to the present application, the mass ratio of the aminoalkyl silane to the nanosilica is 1:1 to 1:5, for example, but not limited to, 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, or 1:5, or within a range between any two of the above values. When the mass ratio of the aminoalkyl silane to the nanosilica is within the above range, each nanosilica particle can be better surrounded and connected by an appropriate amount of polypropylene molecular chain, the dispersion of the nanosilica is promoted, an effective "polymer-nanoparticle" bridging interface is formed, and the long-term oil-repellency and mechanical properties of the polypropylene composite material are better balanced.

[0017] As a preferred embodiment of the oil-repellent polypropylene composite material according to the present application, the average particle size of the nanosilica is 5 nm to 100 nm, for example, but not limited to, 5 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, or 100 nm, or within a range between any two of the above values. The average particle size of the nanosilica can be measured by an electron microscope (such as SEM or TEM).

[0018] In some embodiments, the nanosilica can be, but is not limited to, fumed silica, precipitated silica, sol-gel silica, etc., and is preferably hydrophobic fumed silica (such as HDMS hydrophobically modified fumed silica).

[0019] As a preferred embodiment of the oil-repellent polypropylene composite material according to the present application, the aminoalkyl silane includes at least one of γ-aminopropyl trimethoxysilane, γ-aminopropyl triethoxysilane, N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane, N-(β-aminoethyl)-γ-aminopropyl triethoxysilane, and N-(β-aminoethyl)-γ-aminopropyl methyl dimethoxysilane.

[0020] As a preferred embodiment of the oil-repellent polypropylene composite material according to the present application, the polypropylene resin is at least one of homopolymer polypropylene and copolymer polypropylene.

[0021] As a preferred embodiment of the oil-repellent polypropylene composite material of the present application, the melt mass flow rate of the polypropylene resin is 1 g / 10 min to 100 g / 10 min under the condition of 230℃, 2.16 kg (test standard: ISO 1133-2022), for example, but not limited to, 1 g / 10 min, 2 g / 10 min, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min, 50 g / 10 min, 55 g / 10 min, 60 g / 10 min, 65 g / 10 min, 70 g / 10 min, 75 g / 10 min, 80 g / 10 min, 85 g / 10 min, 90 g / 10 min, 95 g / 10 min, or 100 g / 10 min, or within a range between any two of the above values.

[0022] As a preferred embodiment of the oil-repellent polypropylene composite material of the present application, the toughening agent includes at least one of a styrene-based thermoplastic elastomer and a polyolefin elastomer.

[0023] In some embodiments, the styrene-based thermoplastic elastomer includes, but is not limited to, at least one of styrene butadiene rubber (SBR), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-isoprene-styrene elastomer (SIS), methyl methacrylate-butadiene-styrene copolymer (MBS), and acrylonitrile-styrene-acrylate copolymer (ASA).

[0024] In some embodiments, the polyolefin elastomer includes, but is not limited to, at least one of ethylene-butene copolymer, ethylene-hexene copolymer, and ethylene-octene copolymer.

[0025] As a preferred embodiment of the oil-repellent polypropylene composite material of the present application, the oil-repellent polypropylene composite material further includes 0.1 to 1 parts by weight of a processing aid.

[0026] In some embodiments, the parts by weight of the processing aid in the oil-repellent polypropylene composite material can be, but is not limited to, 0.1 parts, 0.3 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 parts, or within a range between any two of the above values.

[0027] In some embodiments, the processing aid includes, but is not limited to, an antioxidant, a light stabilizer, a lubricant, and the like.

[0028] Exemplarily, the antioxidant can be, but is not limited to, at least one of hindered phenol antioxidant, phosphite antioxidant, thioester antioxidant.

[0029] Exemplarily, the lubricant can be, but is not limited to, at least one of silicone lubricant, ester lubricant, amide lubricant, polyethylene lubricant, stearic acid lubricant, fatty acid lubricant.

[0030] In a second aspect, the present application provides a preparation method of the above-mentioned oil-repellent polypropylene composite material, comprising the following steps: uniformly mixing and melt-extruding the components to obtain the oil-repellent polypropylene composite material.

[0031] Optionally, the melt-extrusion in the above-mentioned preparation method can be carried out by using a double-screw extruder, the temperature for melt-extrusion is 190-220℃, and the screw rotation speed of the double-screw extruder is 350-450 rpm.

[0032] In a third aspect, the present application provides an application of the above-mentioned oil-repellent polypropylene composite material in preparing automobile interior and exterior trim parts, electronic and electrical housings, kitchenware or tableware.

[0033] For example, the automobile interior and exterior trim parts include, but are not limited to, oil-easy-to-stain trim parts such as center control panel, door panel, armrest, etc.; the electronic and electrical housings include, but are not limited to, panels of smart phones, tablet computers and household appliances, etc.

[0034] In a fourth aspect, the present application provides an automobile interior and exterior trim part or an electronic and electrical housing made of the above-mentioned oil-repellent polypropylene composite material.

[0035] Compared with the prior art, the present application has the following beneficial effects: In the present application, maleic anhydride, aminoalkylsilane and nano-silica are used as main components to form the oil-repellent agent. During the melt blending of the components, maleic anhydride reacts with the polypropylene molecular chain under the action of the initiator to generate polypropylene grafted maleic anhydride, and meanwhile, the acid anhydride functional group in the polypropylene grafted maleic anhydride also reacts with the amino group in the aminoalkylsilane to form a firm covalent bond. The siloxane group in the aminoalkylsilane can be hydrolyzed to form silicon hydroxyl group, which can anchor the nano-silica and promote the uniform dispersion of the nano-silica in the polypropylene resin. A structure similar to that with polypropylene molecular chain as "root", alkyl chain as "leaf" and nano-silica as "fruit" is formed. The nano-silica provides micro-nano composite roughness, and the grafted alkyl chain provides low surface energy. The two work together to improve the long-term oil-repellent performance of the polypropylene composite material. Moreover, the grafted groups on the polypropylene molecular chain can also enhance the interfacial bonding performance between the polypropylene resin and the toughening agent and the inorganic filler, promote the uniform dispersion of the inorganic filler, and synergistically work with the nano-silica dispersed in nano-scale, so that the polypropylene composite material has good mechanical properties. DETAILED DESCRIPTION

[0036] For better illustrating the purpose, technical scheme and advantages of the present application, the present application will be further explained in combination with specific examples.

[0037] Other materials, reagents and the like used in the examples and comparative examples can be obtained from commercial channels unless otherwise specified.

[0038] 1. Raw material reagents <Polypropylene resin> PP-1, melt mass flow rate of 60 g / 10 min, brand PP M60RHC, manufacturer Zhenhai Refinery; PP-2, melt mass flow rate of 30 g / 10 min, brand PP EP548R, manufacturer China Petroleum; PP-3, melt mass flow rate of 10 g / 10 min, brand PP AP3N, manufacturer Exxon Mobil; <Toughening agent> Toughening agent 1 (SEBS), brand SEBS1643, manufacturer Korten; Toughening agent 2 (SBS), brand SBS D0243, manufacturer Korten; Toughening agent 3 (POE ethylene-butene copolymer), brand POE ENGAGE 7447, manufacturer Dow Chemical.

[0039] <Inorganic filler> Inorganic filler 1 is polar talc powder, brand TP118B, manufacturer Shanghai Huazhongrong Industry and Trade; Inorganic filler 2 is talc powder, brand TYT-777A, manufacturer Tianyuan Chemical Industry.

[0040] <Oil-repellent agent> Maleic anhydride, commercially available; The initiator is benzoyl peroxide, commercially available; Aminoalkyl silane 1 is γ-aminopropyl trimethoxysilane, commercially available; Aminoalkyl silane 2 is γ-aminopropyl triethoxysilane, commercially available; Tetraethoxysilane (TEOS), commercially available; Polydimethylsiloxane, brand DC200, manufacturer Dow Corning; Nano-silica 1, average particle size of 7 nm, brand AEROSIL R812, manufacturer Wacker; Nano-silica 2, average particle size of 12 nm, brand AEROSIL R805, manufacturer Wacker; Oleophobic agent 1 is composed of maleic anhydride, aminoalkylsilane 1 and nanosilica 1, the molar ratio of maleic anhydride to aminoalkylsilane 1 is 1:1, and the mass ratio of aminoalkylsilane 1 to nanosilica 1 is 1:1; Oleophobic agent 2 is composed of maleic anhydride, aminoalkylsilane 1 and nanosilica 1, the molar ratio of maleic anhydride to aminoalkylsilane 1 is 1:0.5, and the mass ratio of aminoalkylsilane 1 to nanosilica 1 is 1:1; Oleophobic agent 3 is composed of maleic anhydride, aminoalkylsilane 1 and nanosilica 1, the molar ratio of maleic anhydride to aminoalkylsilane 1 is 1:1.2, and the mass ratio of aminoalkylsilane 1 to nanosilica 1 is 1:1; Oleophobic agent 4 is composed of maleic anhydride, aminoalkylsilane 1 and nanosilica 1, the molar ratio of maleic anhydride to aminoalkylsilane 1 is 1:1, and the mass ratio of aminoalkylsilane 1 to nanosilica 1 is 1:2; Oleophobic agent 5 is composed of maleic anhydride, aminoalkylsilane 1 and nanosilica 1, the molar ratio of maleic anhydride to aminoalkylsilane 1 is 1:1, and the mass ratio of aminoalkylsilane 1 to nanosilica 1 is 1:5; Oleophobic agent 6 is composed of maleic anhydride, aminoalkylsilane 2 and nanosilica 2, the molar ratio of maleic anhydride to aminoalkylsilane 2 is 1:1, and the mass ratio of aminoalkylsilane 2 to nanosilica 2 is 1:2; Oleophobic agent 7 is composed of maleic anhydride, aminoalkylsilane 1 and nanosilica 1, the molar ratio of maleic anhydride to aminoalkylsilane 1 is 1:0.2, and the mass ratio of aminoalkylsilane 1 to nanosilica 1 is 1:1; Oleophobic agent 8 is composed of maleic anhydride, aminoalkylsilane 1 and nanosilica 1, the molar ratio of maleic anhydride to aminoalkylsilane 1 is 1:1, and the mass ratio of aminoalkylsilane 1 to nanosilica 1 is 1:20; Oleophobic agent 9 is composed of maleic anhydride, tetraethoxysilane and nanosilica 1, the molar ratio of maleic anhydride to tetraethoxysilane is 1:1, and the mass ratio of tetraethoxysilane to nanosilica 1 is 1:1.

[0041] <Initiator> The initiator is benzoyl peroxide, commercially available; <Processing aid> The antioxidant is compounded by antioxidant 1010 (commercially available) and antioxidant 168 (commercially available) at a mass ratio of 1:1; The lubricant is zinc stearate, commercially available.

[0042] 2. The preparation method of the oleophobic polypropylene composite material According to the formula, after the components are uniformly mixed, they are added into a twin-screw extruder, and then melt-extruded and granulated at 190-220 ℃ to obtain the oleophobic polypropylene composite; wherein the screw rotation speed of the twin-screw extruder is 400 rpm.

[0043] 3. Performance test 1) Contact angle test: the oleophobic polypropylene composite of each example and comparative example is injection molded into a sample piece with a size of 50 mm x 50 mm x 3 mm, and the sample piece of each example or comparative example is randomly divided into three groups A, B and C. Group A: directly according to the test method of GB / T 30693-2014, the surface contact angle of the sample piece is tested to obtain the contact angle a; Group B: first boil the sample piece at 90 ℃ for 168 h, and then according to the test method of GB / T 30693-2014, the surface contact angle of the sample piece is tested to obtain the contact angle b; Group C: first heat age the sample piece at 120 ℃ for 1000 h, and then according to the test method of GB / T 30693-2014, the surface contact angle of the sample piece is tested to obtain the contact angle c.

[0044] 2) Flexural modulus: tested according to standard ISO 178:2019, 23 ℃, 2 mm / min, span of 64 mm.

[0045] 3) Notched impact strength: tested according to standard ISO 179 / 1eA:2023, 23 ℃, A-type notch, pendulum energy of 4 J.

[0046] Table 1: weight fractions of components and properties of oleophobic polypropylene composites in Examples 1-6 Example 1 2 3 4 5 6 Polypropylene resin 1 65 / / / / / Polypropylene resin 2 / 65 / 65 65 65 Polypropylene resin 3 / / 65 / / / Toughener 1 12 12 12 / / 12 Toughener 2 / / / 12 / / Toughener 3 / / / / 12 / Inorganic filler 1 20 20 20 20 20 / Inorganic filler 2 / / / / / 20 Oleophobic agent 1 3 3 3 3 3 3 Initiator 0.12 0.12 0.12 0.12 0.12 0.12 Antioxidant 0.1 0.1 0.1 0.1 0.1 0.1 Lubricant 0.2 0.2 0.2 0.2 0.2 0.2 Contact angle a (°) 111.7 111.4 111.6 112.7 115.2 117.5 Contact angle b (°) 110.5 110.1 111.4 111.7 115.1 116.8 Contact angle c (°) 109.9 109.9 110 111.1 114.8 116.3 Flexural modulus (MPa) 1850 1620 1775 1645 1615 1625 Notched Izod impact strength (kJ / m 2 ) 17.6 20.8 19.3 17.7 19.4 20.2 Table 2: weight fractions of components and properties of oleophobic polypropylene composites in Examples 7-11 Example 2 7 8 9 10 11 Polypropylene resin 2 65 65 65 65 65 65 Toughener 1 12 12 12 12 12 12 Inorganic filler 1 20 20 20 20 20 20 Oleophobic agent 1 3 / / / / / Oleophobic agent 2 / 3 / / / / Oleophobic agent 3 / / 3 / / / Oleophobic agent 4 / / / 3 / / Oleophobic agent 5 / / / / 3 / Oleophobic agent 6 / / / / / 3 Initiator 0.12 0.12 0.12 0.12 0.12 0.12 Antioxidant 0.1 0.1 0.1 0.1 0.1 0.1 Lubricant 0.2 0.2 0.2 0.2 0.2 0.2 Contact angle a (°) 111.4 109.8 112.7 124.3 118.2 120.4 Contact angle b (°) 110.1 109.3 110.2 124.1 116.5 120 Contact angle c (°) 109.9 109 109.8 123.8 115.4 119.4 Flexural modulus (MPa) 1620 1610 1625 1660 1665 1705 Notched Charpy impact strength (kJ / m 2 )]]> 20.8 20.7 20.7 21.2 20.8 18.6 Table 3: weight fractions of components and properties of oleophobic polypropylene composites in Examples 12-15 Example 12 13 14 15 Polypropylene resin 2 40 95 55 75 Toughener 1 20 5 16 8 Inorganic filler 1 35 5 25 15 Oleophobic agent 1 1 5 2 4 Initiator 0.12 0.12 0.12 0.12 Antioxidant 0.1 / 0.1 0.1 Lubricant 0.2 / 0.2 0.2 Contact angle a (°) 108.5 113.4 110.5 114.5 Contact angle b (°) 107.7 110.2 109.8 113.2 Contact angle c (°) 107.2 108.6 109.2 110.8 Flexural modulus (MPa) 3280 1420 2225 1880 Notched Charpy impact strength (kJ / m 2 )]]> 27.9 13.6 24.3 15.4 Table 4: weight fractions of components and properties of oleophobic polypropylene composites in Comparative Examples 1-6 In Table 1, Table 2, Table 3 and Table 4, " / " means no relevant parameter.

[0047] According to the data in Tables 1-4, the initial contact angles of the oil-repellent polypropylene composites in Examples 1-15 are all ≥108.5°, and the contact angles after boiling in water at 90℃ for 168h are all ≥107.7°, and the contact angles after heat aging at 120℃ for 1000h are all ≥107.2°, indicating that the oil-repellent polypropylene composites have excellent long-term oil-repellency; at the same time, the flexural modulus of the oil-repellent polypropylene composites in Examples 1-13 all reach ≥1420MPa, and the notched impact strength all reaches ≥13.6kJ / m 2 The above has met the conventional requirements for the mechanical properties of the polypropylene composite.

[0048] According to Examples 2, Comparative Example 1 and Comparative Example 2, when the amount of aminoalkylsilane in the oil-repellent agent is less or the amount of nano-silica is more, the mechanical properties of the polypropylene composite are less affected, but the long-term oil-repellency cannot be effectively improved; according to Comparative Example 3, when tetraethoxysilane is used to replace the aminoalkylsilane in the oil-repellent agent, the tetraethoxysilane cannot be anchored in the polypropylene composite because it cannot react with maleic anhydride, although the initial oil-repellency of the polypropylene composite can be improved, the improvement in long-term oil-repellency is limited; according to Comparative Example 4, it can also be found that using polydimethylsiloxane as the oil-repellent agent can only slightly improve the long-term oil-repellency of the polypropylene composite.

[0049] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. An oleophobic polypropylene composite material, characterized in that, By weight, it includes the following components: The mixture comprises 39-96 parts of polypropylene resin, 5-20 parts of toughening agent, 5-35 parts of inorganic filler, 0.5-5 parts of oleophobic agent, and 0.05-0.8 parts of initiator; the oleophobic agent is mainly composed of maleic anhydride, aminoalkylsilane and nano silica.

2. The oleophobic polypropylene composite material as described in claim 1, characterized in that, The molar ratio of maleic anhydride to amino group in the oleophobic agent is ≤1:0.4, and the mass ratio of alkylamine to nano-silica is ≥1:

8.

3. The oleophobic polypropylene composite material as described in claim 2, characterized in that, The molar ratio of maleic anhydride to amino group in aminoalkylsilane is 1:0.5 to 1:1.2, and / or the mass ratio of aminoalkylsilane to nano-silica is 1:1 to 1:

5.

4. The oleophobic polypropylene composite material as described in claim 1, characterized in that, The average particle size of the nano-silica is 5 nm to 100 nm.

5. The oleophobic polypropylene composite material as described in claim 1, characterized in that, The aminoalkylsilane includes at least one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, and N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane.

6. The oleophobic polypropylene composite material as described in claim 1, characterized in that, The melt flow rate of the polypropylene resin at 230°C and 2.16 kg is 1 g / 10 min to 100 g / 10 min. And / or, the toughening agent includes at least one of styrene-based thermoplastic elastomers and polyolefin elastomers.

7. The oleophobic polypropylene composite material as described in claim 1, characterized in that, The oleophobic polypropylene composite material also includes 0.1 to 1 part by weight of processing aids.

8. The method for preparing the oleophobic polypropylene composite material according to any one of claims 1 to 7, characterized in that, The process includes the following steps: mixing the components evenly, melting and extruding to obtain an oleophobic polypropylene composite material.

9. The use of the oleophobic polypropylene composite material according to any one of claims 1 to 7 in the preparation of automotive interior and exterior parts, electronic and electrical housings, kitchenware or tableware.

10. A type of automotive interior / exterior trim or electronic housing, characterized in that, Made from the oleophobic polypropylene composite material according to any one of claims 1 to 7.

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