CN117487303B - Photo-thermal aging resistant modified polypropylene material, preparation method thereof and application thereof in non-woven fabric - Google Patents

Photo-thermal aging resistant modified polypropylene material, preparation method thereof and application thereof in non-woven fabric Download PDF

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CN117487303B
CN117487303B CN202311831600.8A CN202311831600A CN117487303B CN 117487303 B CN117487303 B CN 117487303B CN 202311831600 A CN202311831600 A CN 202311831600A CN 117487303 B CN117487303 B CN 117487303B
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陈俊平
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Shantou Kecai New Material Co ltd
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
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    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
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    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
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Abstract

The invention discloses a photo-thermal aging resistant modified polypropylene material, a preparation method thereof and application thereof in non-woven fabrics, and relates to the technical field of high polymer materials. When the photo-thermal aging resistant modified polypropylene material is prepared, the carbon oxide nano tube and 3-chloropropene are reacted to prepare the allyl carbon nano tube, and then the allyl carbon nano tube is reacted with tetramethyl disiloxane and N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine to prepare the modified carbon nano tube; mixing diphenyl ketone, allyl dimethyl phosphate, p-chlorostyrene and acetone to prepare photoinitiated grafting solution; the modified polypropylene powder is prepared by carrying out photoinitiated grafting reaction on polypropylene powder and photoinitiated grafting solution and then reacting with N-N-butyl-2, 6-tetramethyl-4-piperidylamine; and melting, mixing, extruding and granulating the modified carbon nano tube and the modified polypropylene powder to obtain the photo-thermal aging resistant modified polypropylene material. The photo-thermal aging resistant modified polypropylene material prepared by the invention has good flame retardant property, tensile strength and photo-thermal aging resistant property.

Description

Photo-thermal aging resistant modified polypropylene material, preparation method thereof and application thereof in non-woven fabric
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a photo-thermal aging resistant modified polypropylene material, a preparation method thereof and application thereof in non-woven fabrics.
Background
Nonwoven fabrics, also known as nonwovens, are a wide variety of fabrics formed without spinning a fabric, and include hydroentangled, thermally bonded, melt blown, needled, spun bonded, stitch bonded, and the like. Different fiber raw materials and production processes can be made into various product types, and the flexibility, thickness and various properties and shapes of the product can be freely changed. At present, the non-woven fabric is rapidly developed, and the most main production raw material of the non-woven fabric is polypropylene, so that the polypropylene has the advantages of abundant sources, low price, no toxicity, good transparency, low density, good heat resistance, good corrosion resistance, good electrical insulation, good rigidity and folding resistance, easy processing and forming and the like, and has good application effect in the non-woven fabric.
However, because of unstable tertiary carbon atoms in the structure of polypropylene, the polypropylene is particularly sensitive to illumination, and is extremely easy to age when being used outdoors, phenomena such as yellowing, embrittlement, surface cracking and the like can occur, and more serious, the polypropylene can lead to the great reduction of mechanical properties such as tensile strength, impact strength, bending strength, elongation at break and the like, and lose the use value. The main reason for ageing polypropylene is that these materials absorb ultraviolet light energy and initiate an autoxidation reaction, which leads to photodegradation and deterioration of the local appearance and physical and mechanical properties of the product. Therefore, the improvement of the photo-thermal aging resistance of the polypropylene material has great research significance.
Disclosure of Invention
The invention aims to provide a photo-thermal aging resistant modified polypropylene material, a preparation method thereof and application thereof in non-woven fabrics, so as to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme: the photo-thermal aging resistant modified polypropylene material is prepared by melting, mixing, extruding and granulating modified carbon nano tubes and modified polypropylene powder.
As optimization, the modified carbon nano tube is prepared by reacting carbon oxide nano tube with 3-chloropropene to prepare allyl carbon nano tube, and then reacting with tetramethyl disiloxane and N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine.
As optimization, the modified polypropylene powder is prepared by carrying out photoinitiated grafting reaction on polypropylene powder and photoinitiated grafting solution and then reacting with N-N-butyl-2, 6-tetramethyl-4-piperidylamine.
As optimization, the photoinitiation grafting solution is formed by mixing benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone.
A preparation method of a photo-thermal aging resistant modified polypropylene material comprises the following preparation steps:
(1) The method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 20-25% sodium hydroxide aqueous solution in a mass ratio of 1: (3-4): (30-40), uniformly mixing, stirring at 50-60 ℃ for reaction for 4-6 hours at 200-300 r/min, centrifugally separating, washing with pure water for 3-5 times, and drying at 60-70 ℃ for 10-12 hours to obtain the allyl carbon nanotube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1: (3-4): (15-20): (15-20): (0.03-0.05), adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 4-6 hours at 70-80 ℃ and 300-500 r/min, centrifugally separating, washing for 3-5 times with pure water, drying for 10-12 hours at 60-70 ℃ to obtain a pre-modified carbon nano tube, and mixing the pre-modified carbon nano tube, anhydrous aluminum trichloride and chlorobenzene according to a mass ratio of 1: (0.3 to 0.4): (10-12) uniformly mixing, stirring for 20-30 min at 0-3 ℃ at 200-300 r/min, adding resorcinol with the mass which is 0.6-0.8 times that of the pre-modified carbon nano tube, heating to 75-80 ℃, continuously stirring for reacting for 4-6 h, naturally cooling to room temperature, centrifugally separating, washing for 3-5 times with pure water, and drying for 10-12 h at 60-70 ℃ to obtain the modified carbon nano tube;
(2) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1: (3-4): (3-4): (30-40) uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder and photoinitiated grafting solution are mixed according to the mass ratio of 1: (6-8) uniformly mixing, using an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 as a light source, irradiating for 6-8 min, stirring for 6-8 h at the temperature of 20-30 ℃ and the speed of 200-300 r/min after irradiation, centrifugally separating, washing for 3-5 times by pure water and absolute ethyl alcohol respectively, and drying for 10-12 h at the temperature of 60-70 ℃ to obtain pre-modified polypropylene powder; the preparation method comprises the following steps of (1) mixing pre-modified polypropylene powder, N-N-butyl-2, 6-tetramethyl-4-piperidylamine, N-dimethylformamide and 10-12% sodium hydroxide aqueous solution according to a mass ratio of 1: (2-3): (8-10): (8-10) uniformly mixing, stirring at 30-40 ℃ for reaction for 4-6 hours at 300-500 r/min, pouring the mixture into pure water with the mass 50 times that of the pre-modified polypropylene powder, stirring at 300-500 r/min for 10-15 min, filtering, and washing with pure water and absolute ethyl alcohol for 3-5 times respectively to obtain modified polypropylene powder;
(3) The modified carbon nano tube and modified polypropylene powder are mixed according to the mass ratio of 1: (10-20) uniformly mixing, adding into a double-screw extruder, melting and blending, wherein the temperature of the first region is 180-190 ℃, the temperature of the second region is 190-200 ℃, the temperature of the third region is 200-210 ℃, the temperature of the fourth region is 210-220 ℃, the temperature of the fifth region is 220-230 ℃, the screw rotating speed is 180-200 r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
As an optimization, the preparation method of the carbon oxide nanotubes in the step (1) comprises the following steps: the method comprises the following steps of (1) mixing carbon nanotubes, potassium permanganate and 95-98% of concentrated sulfuric acid according to a mass ratio of 1:1: (10-12), stirring at 50-60 ℃ for reaction for 4-6 hours at 200-300 r/min, centrifugally separating, washing with pure water for 3-5 times, adding hydrogen peroxide aqueous solution with the mass fraction of 20-25% which is 1-1.2 times that of the carbon nano tube, stirring at 0-3 ℃ for 10-15 minutes at 200-300 r/min, centrifugally separating, washing with pure water for 3-5 times, and drying at 60-70 ℃ for 10-12 hours.
As optimization, the reaction process of the modified carbon nano tube in the step (1) is as follows:
；
the resorcinol and triazine structure are combined to form a conjugate hydrogen bond six-membered ring, absorbed light energy can be converted into heat energy through ring opening and ring closing of the conjugate hydrogen bond six-membered ring, and the ring opening and ring closing processes are as follows:
。
preferably, the polypropylene powder in the step (2) is PC0580.
As an optimization, the reaction process of the modified polypropylene powder in the step (2) is as follows:
；
Wherein R is H or CH 3.
An application of photo-thermal aging resistant modified polypropylene material in non-woven fabrics.
Compared with the prior art, the invention has the following beneficial effects: when the photo-thermal aging resistant modified polypropylene material is prepared, the modified carbon nano tube and modified polypropylene powder are melted, mixed, extruded and pelletized to prepare the photo-thermal aging resistant modified polypropylene material.
Firstly, the carbon nanotube oxide reacts with 3-chloropropene to prepare allyl carbon nanotube, then the allyl carbon nanotube reacts with tetramethyl disiloxane and N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine to prepare modified carbon nanotube, so that the modified carbon nanotube can be better reinforced, absorb light and dissipate heat, the photo-thermal aging resistance is improved, the imino on the long chain of organosilicon and the phosphate anion on modified polypropylene powder form electrostatic combination, the tensile strength is improved, the long chain of organosilicon has good flame retardant effect, and the meta-diphenol reacts with the triazine structure on the pre-modified carbon nanotube to form a conjugate hydrogen bond six-membered ring, thereby having good ultraviolet light absorption effect and improving the photo-thermal aging resistance effect.
Secondly, mixing benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone to prepare photoinitiated grafting solution; the modified polypropylene powder is prepared by carrying out photoinitiated grafting reaction on polypropylene powder and photoinitiated grafting solution and then reacting with N-N-butyl-2, 6-tetramethyl-4-piperidylamine; the photo-initiated grafting solution is used for modification, the diphenyl ketone is a hydrogen abstraction type wide initiator, hydrogen on a polypropylene chain segment can be abstracted, free radicals are generated on the polypropylene chain segment, so that allyl dimethyl phosphate and p-chlorostyrene are grafted on the polypropylene chain segment through polymerization of free radical unsaturated bonds, the flame retardance of the grafted phosphate groups is improved, phosphate anions formed by hydrolysis of the phosphate can be combined with imino groups on the modified carbon nano tube electrostatically, the tensile strength is improved, and then N-N-butyl-2, 6-tetramethyl-4-piperidylamine is grafted on the polypropylene, so that the photo-thermal aging resistant effect is improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method provided by the present invention is described in detail by the following examples for more clarity of illustration.
Example 1
The preparation method of the photo-thermal aging resistant modified polypropylene material mainly comprises the following preparation steps:
(1) The method comprises the following steps of (1) mixing carbon nano tubes, potassium permanganate and 95% concentrated sulfuric acid according to a mass ratio of 1:1:10, uniformly mixing, stirring at 50 ℃ for reaction for 6 hours at 200r/min, centrifugally separating, washing with pure water for 3 times, adding into a 25% hydrogen peroxide aqueous solution which is 1 time of the mass of the carbon nano tube, stirring at 0 ℃ for 10 minutes at 200r/min, centrifugally separating, washing with pure water for 3 times, and drying at 60 ℃ for 12 hours to obtain the carbon oxide nano tube; the method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 20% sodium hydroxide aqueous solution in a mass ratio of 1:3:30, uniformly mixing, stirring at 50 ℃ and 200r/min for reaction for 6 hours, centrifugally separating, washing with pure water for 3 times, and drying at 60 ℃ for 12 hours to obtain the allyl carbon nano tube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1:3:15:15:0.03, adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 6 hours at 70 ℃ and 300r/min, centrifugally separating, washing with pure water for 3 times, drying at 60 ℃ for 12 hours to obtain a pre-modified carbon nano tube, and mixing the pre-modified carbon nano tube, anhydrous aluminum trichloride and chlorobenzene according to a mass ratio of 1:0.3:10, uniformly mixing, stirring for 30min at 0 ℃ at 200r/min, adding resorcinol with the mass which is 0.6 times that of the pre-modified carbon nano tube, heating to 75 ℃, continuously stirring for reaction for 6h, naturally cooling to room temperature, centrifugally separating, washing for 3 times with pure water, and drying at 60 ℃ for 12h to obtain the modified carbon nano tube;
(2) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1:3:3:30, uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder PC0580 and photoinitiated grafting solution are mixed according to the mass ratio of 1:6, uniformly mixing, using an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 as a light source, irradiating for 6min, stirring for 8h at 20 ℃ and 200r/min after irradiation, centrifugally separating, washing with pure water and absolute ethyl alcohol for 3 times respectively, and drying at 60 ℃ for 12h to obtain pre-modified polypropylene powder; the preparation method comprises the steps of (1) mixing pre-modified polypropylene powder, N-N-butyl-2, 6-tetramethyl-4-piperidylamine, N-dimethylformamide and 10% sodium hydroxide aqueous solution according to a mass ratio of 1:2:8:8, uniformly mixing, stirring at 30 ℃ for reaction for 6 hours at 300r/min, pouring the mixture into pure water with the mass of 50 times of that of the pre-modified polypropylene powder, stirring at 300r/min for 15min, filtering, and washing 3 times by using 5% hydrochloric acid solution and absolute ethyl alcohol respectively to obtain modified polypropylene powder;
(3) The modified carbon nano tube and modified polypropylene powder are mixed according to the mass ratio of 1:10, adding the mixture into a double-screw extruder for melt blending, wherein the temperature of the first region is 180 ℃, the temperature of the second region is 190 ℃, the temperature of the third region is 200 ℃, the temperature of the fourth region is 210 ℃, the temperature of the fifth region is 220 ℃, the screw rotating speed is 180r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
Example 2
The preparation method of the photo-thermal aging resistant modified polypropylene material mainly comprises the following preparation steps:
(1) Carbon nano tubes, potassium permanganate and 96% concentrated sulfuric acid by mass percent are mixed according to the mass ratio of 1:1:11, stirring and reacting for 5 hours at 55 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, adding a hydrogen peroxide water solution with the mass fraction of 22% which is 1.1 times that of the carbon nano tube, stirring for 12 minutes at 1 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, and drying for 11 hours at 65 ℃ to obtain the carbon oxide nano tube; the method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 22% sodium hydroxide aqueous solution in a mass ratio of 1:3.5:35, stirring and reacting for 5 hours at 55 ℃ and 250r/min, centrifugally separating, washing for 4 times by pure water, and drying for 11 hours at 65 ℃ to obtain the allyl carbon nano tube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1:3.5:18:18:0.04, adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 5 hours at 75 ℃ and 400r/min, centrifugally separating, washing with pure water for 4 times, drying at 65 ℃ for 11 hours to obtain a pre-modified carbon nano tube, and mixing the pre-modified carbon nano tube, anhydrous aluminum trichloride and chlorobenzene according to a mass ratio of 1:0.35:11, stirring for 25min at 1 ℃ at 250r/min, adding resorcinol with the mass which is 0.7 times that of the pre-modified carbon nano tube, heating to 78 ℃, continuously stirring for reacting for 5h, naturally cooling to room temperature, centrifugally separating, washing for 4 times with pure water, and drying for 11h at 65 ℃ to obtain the modified carbon nano tube;
(2) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1:3.5:3.5:35, uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder PC0580 and photoinitiated grafting solution are mixed according to the mass ratio of 1:7, uniformly mixing, adopting an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 as a light source, irradiating for 7min, stirring for 7h at 25 ℃ and 250r/min after irradiation, centrifugally separating, washing for 4 times by using pure water and absolute ethyl alcohol respectively, and drying for 11h at 65 ℃ to obtain pre-modified polypropylene powder; the preparation method comprises the steps of (1) mixing pre-modified polypropylene powder, N-N-butyl-2, 6-tetramethyl-4-piperidylamine, N-dimethylformamide and 11% sodium hydroxide aqueous solution according to a mass ratio of 1:2.5:9:9, uniformly mixing, stirring at 35 ℃ for reaction for 5 hours at 400r/min, pouring the mixture into pure water with the mass of 50 times of that of the pre-modified polypropylene powder, stirring at 400r/min for 12min, filtering, and washing with 5% hydrochloric acid solution and absolute ethyl alcohol for 4 times respectively to obtain modified polypropylene powder;
(3) The modified carbon nano tube and modified polypropylene powder are mixed according to the mass ratio of 1:15, adding the mixture into a double-screw extruder for melt blending, wherein the temperature of the first region is 185 ℃, the temperature of the second region is 195 ℃, the temperature of the third region is 205 ℃, the temperature of the fourth region is 215 ℃, the temperature of the fifth region is 225 ℃, the rotating speed of the screw is 190r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
Example 3
The preparation method of the photo-thermal aging resistant modified polypropylene material mainly comprises the following preparation steps:
(1) The method comprises the following steps of (1) mixing carbon nano tubes, potassium permanganate and 98% of concentrated sulfuric acid according to a mass ratio of 1:1:12, stirring and reacting for 4 hours at 60 ℃ at 300r/min, centrifugally separating and washing with pure water for 5 times, adding 25% hydrogen peroxide water solution with the mass fraction which is 1.2 times that of the carbon nano tube, stirring for 15 minutes at 3 ℃ at 300r/min, centrifugally separating and washing with pure water for 5 times, and drying for 12 hours at 70 ℃ to obtain the carbon oxide nano tube; the method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 25% sodium hydroxide aqueous solution in a mass ratio of 1:4:40, stirring at 60 ℃ and 300r/min for reaction for 4 hours, centrifugally separating, washing with pure water for 5 times, and drying at 70 ℃ for 10 hours to obtain the allyl carbon nano tube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1:4:20:20:0.05, adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 4 hours at 80 ℃ and 500r/min, centrifugally separating, washing with pure water for 5 times, drying at 70 ℃ for 10 hours to obtain a pre-modified carbon nano tube, and mixing the pre-modified carbon nano tube, anhydrous aluminum trichloride and chlorobenzene according to a mass ratio of 1:0.4:12, uniformly mixing, stirring for 20min at 3 ℃ at 300r/min, adding resorcinol with the mass which is 0.8 times that of the pre-modified carbon nano tube, heating to 80 ℃, continuously stirring for reaction for 4h, naturally cooling to room temperature, centrifugally separating, washing for 5 times with pure water, and drying for 10h at 70 ℃ to obtain the modified carbon nano tube;
(2) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1:4:4:40, uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder PC0580 and photoinitiated grafting solution are mixed according to the mass ratio of 1:8, uniformly mixing, adopting an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 as a light source, irradiating for 8min, stirring for 6h at 30 ℃ and 300r/min after irradiation, centrifugally separating, washing for 5 times by pure water and absolute ethyl alcohol respectively, and drying for 10h at 70 ℃ to obtain pre-modified polypropylene powder; the preparation method comprises the steps of (1) mixing pre-modified polypropylene powder, N-N-butyl-2, 6-tetramethyl-4-piperidylamine, N-dimethylformamide and 12% sodium hydroxide aqueous solution according to a mass ratio of 1:3:10:10, uniformly mixing, stirring at 40 ℃ for reaction for 4 hours at 500r/min, pouring the mixture into pure water with the mass of 50 times of that of the pre-modified polypropylene powder, stirring at 500r/min for 10min, filtering, and washing with 5% hydrochloric acid solution and absolute ethyl alcohol respectively for 5 times to obtain modified polypropylene powder;
(3) The modified carbon nano tube and modified polypropylene powder are mixed according to the mass ratio of 1:20, adding the mixture into a double-screw extruder for melt blending, wherein the temperature of the first region is 190 ℃, the temperature of the second region is 200 ℃, the temperature of the third region is 210 ℃, the temperature of the fourth region is 220 ℃, the temperature of the fifth region is 230 ℃, the screw rotating speed is 200r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
Comparative example 1
The preparation method of the photo-thermal aging resistant modified polypropylene material mainly comprises the following preparation steps:
(1) Carbon nano tubes, potassium permanganate and 96% concentrated sulfuric acid by mass percent are mixed according to the mass ratio of 1:1:11, stirring and reacting for 5 hours at 55 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, adding a hydrogen peroxide water solution with the mass fraction of 22% which is 1.1 times that of the carbon nano tube, stirring for 12 minutes at 1 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, and drying for 11 hours at 65 ℃ to obtain the carbon oxide nano tube; the method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 22% sodium hydroxide aqueous solution in a mass ratio of 1:3.5:35, stirring and reacting for 5 hours at 55 ℃ and 250r/min, centrifugally separating, washing for 4 times by pure water, and drying for 11 hours at 65 ℃ to obtain the allyl carbon nano tube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1:3.5:18:18:0.04, adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 5 hours at 75 ℃ and 400r/min, centrifugally separating, washing for 4 times with pure water, and drying for 11 hours at 65 ℃ to obtain the modified carbon nano tube;
(2) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1:3.5:3.5:35, uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder PC0580 and photoinitiated grafting solution are mixed according to the mass ratio of 1:7, uniformly mixing, adopting an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 as a light source, irradiating for 7min, stirring for 7h at 25 ℃ and 250r/min after irradiation, centrifugally separating, washing for 4 times by using pure water and absolute ethyl alcohol respectively, and drying for 11h at 65 ℃ to obtain pre-modified polypropylene powder; the preparation method comprises the steps of (1) mixing pre-modified polypropylene powder, N-N-butyl-2, 6-tetramethyl-4-piperidylamine, N-dimethylformamide and 11% sodium hydroxide aqueous solution according to a mass ratio of 1:2.5:9:9, uniformly mixing, stirring at 35 ℃ for reaction for 5 hours at 400r/min, pouring the mixture into pure water with the mass of 50 times of that of the pre-modified polypropylene powder, stirring at 400r/min for 12min, filtering, and washing with 5% hydrochloric acid solution and absolute ethyl alcohol for 4 times respectively to obtain modified polypropylene powder;
(3) The modified carbon nano tube and modified polypropylene powder are mixed according to the mass ratio of 1:15, adding the mixture into a double-screw extruder for melt blending, wherein the temperature of the first region is 185 ℃, the temperature of the second region is 195 ℃, the temperature of the third region is 205 ℃, the temperature of the fourth region is 215 ℃, the temperature of the fifth region is 225 ℃, the rotating speed of the screw is 190r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
Comparative example 2
The preparation method of the photo-thermal aging resistant modified polypropylene material mainly comprises the following preparation steps:
(1) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1:3.5:3.5:35, uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder PC0580 and photoinitiated grafting solution are mixed according to the mass ratio of 1:7, uniformly mixing, adopting an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 as a light source, irradiating for 7min, stirring for 7h at 25 ℃ and 250r/min after irradiation, centrifugally separating, washing for 4 times by using pure water and absolute ethyl alcohol respectively, and drying for 11h at 65 ℃ to obtain pre-modified polypropylene powder; the preparation method comprises the steps of (1) mixing pre-modified polypropylene powder, N-N-butyl-2, 6-tetramethyl-4-piperidylamine, N-dimethylformamide and 11% sodium hydroxide aqueous solution according to a mass ratio of 1:2.5:9:9, uniformly mixing, stirring at 35 ℃ for reaction for 5 hours at 400r/min, pouring the mixture into pure water with the mass of 50 times of that of the pre-modified polypropylene powder, stirring at 400r/min for 12min, filtering, and washing with 5% hydrochloric acid solution and absolute ethyl alcohol for 4 times respectively to obtain modified polypropylene powder;
(2) Mixing carbon nano tube and modified polypropylene powder according to a mass ratio of 1:15, adding the mixture into a double-screw extruder for melt blending, wherein the temperature of the first region is 185 ℃, the temperature of the second region is 195 ℃, the temperature of the third region is 205 ℃, the temperature of the fourth region is 215 ℃, the temperature of the fifth region is 225 ℃, the rotating speed of the screw is 190r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
Comparative example 3
The preparation method of the photo-thermal aging resistant modified polypropylene material mainly comprises the following preparation steps:
(1) Carbon nano tubes, potassium permanganate and 96% concentrated sulfuric acid by mass percent are mixed according to the mass ratio of 1:1:11, stirring and reacting for 5 hours at 55 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, adding a hydrogen peroxide water solution with the mass fraction of 22% which is 1.1 times that of the carbon nano tube, stirring for 12 minutes at 1 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, and drying for 11 hours at 65 ℃ to obtain the carbon oxide nano tube; the method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 22% sodium hydroxide aqueous solution in a mass ratio of 1:3.5:35, stirring and reacting for 5 hours at 55 ℃ and 250r/min, centrifugally separating, washing for 4 times by pure water, and drying for 11 hours at 65 ℃ to obtain the allyl carbon nano tube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1:3.5:18:18:0.04, adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 5 hours at 75 ℃ and 400r/min, centrifugally separating, washing with pure water for 4 times, drying at 65 ℃ for 11 hours to obtain a pre-modified carbon nano tube, and mixing the pre-modified carbon nano tube, anhydrous aluminum trichloride and chlorobenzene according to a mass ratio of 1:0.35:11, stirring for 25min at 1 ℃ at 250r/min, adding resorcinol with the mass which is 0.7 times that of the pre-modified carbon nano tube, heating to 78 ℃, continuously stirring for reacting for 5h, naturally cooling to room temperature, centrifugally separating, washing for 4 times with pure water, and drying for 11h at 65 ℃ to obtain the modified carbon nano tube;
(2) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1:3.5:3.5:35, uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder PC0580 and photoinitiated grafting solution are mixed according to the mass ratio of 1:7, uniformly mixing, using an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 as a light source, irradiating for 7min, stirring for 7h at 25 ℃ and 250r/min after irradiation, centrifugally separating, washing for 4 times by using pure water and absolute ethyl alcohol respectively, and drying for 11h at 65 ℃ to obtain modified polypropylene powder;
(3) The modified carbon nano tube and modified polypropylene powder are mixed according to the mass ratio of 1:15, adding the mixture into a double-screw extruder for melt blending, wherein the temperature of the first region is 185 ℃, the temperature of the second region is 195 ℃, the temperature of the third region is 205 ℃, the temperature of the fourth region is 215 ℃, the temperature of the fifth region is 225 ℃, the rotating speed of the screw is 190r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
Comparative example 4
The preparation method of the photo-thermal aging resistant modified polypropylene material mainly comprises the following preparation steps:
(1) Carbon nano tubes, potassium permanganate and 96% concentrated sulfuric acid by mass percent are mixed according to the mass ratio of 1:1:11, stirring and reacting for 5 hours at 55 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, adding a hydrogen peroxide water solution with the mass fraction of 22% which is 1.1 times that of the carbon nano tube, stirring for 12 minutes at 1 ℃ at 250r/min, centrifugally separating and washing with pure water for 4 times, and drying for 11 hours at 65 ℃ to obtain the carbon oxide nano tube; the method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 22% sodium hydroxide aqueous solution in a mass ratio of 1:3.5:35, stirring and reacting for 5 hours at 55 ℃ and 250r/min, centrifugally separating, washing for 4 times by pure water, and drying for 11 hours at 65 ℃ to obtain the allyl carbon nano tube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1:3.5:18:18:0.04, adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 5 hours at 75 ℃ and 400r/min, centrifugally separating, washing with pure water for 4 times, drying at 65 ℃ for 11 hours to obtain a pre-modified carbon nano tube, and mixing the pre-modified carbon nano tube, anhydrous aluminum trichloride and chlorobenzene according to a mass ratio of 1:0.35:11, stirring for 25min at 1 ℃ at 250r/min, adding resorcinol with the mass which is 0.7 times that of the pre-modified carbon nano tube, heating to 78 ℃, continuously stirring for reacting for 5h, naturally cooling to room temperature, centrifugally separating, washing for 4 times with pure water, and drying for 11h at 65 ℃ to obtain the modified carbon nano tube;
(2) The modified carbon nano tube and polypropylene powder PC0580 are mixed according to the mass ratio of 1:15, adding the mixture into a double-screw extruder for melt blending, wherein the temperature of the first region is 185 ℃, the temperature of the second region is 195 ℃, the temperature of the third region is 205 ℃, the temperature of the fourth region is 215 ℃, the temperature of the fifth region is 225 ℃, the rotating speed of the screw is 190r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
Test example 1
Testing of tensile Strength, photo-thermal aging resistance and flame retardant Properties
Preparation of the sample: and (3) placing the photo-thermal aging resistant modified polypropylene material in a mould, carrying out mould pressing for 2 hours at 250 ℃ and 0.5MPa, cooling to 90 ℃, standing for 20 hours, opening the mould, taking out, and selecting the mould according to related standard files or cutting to obtain the sample.
Tensile strength test method: the tensile strength of the photo-thermal aging resistant modified polypropylene material is tested according to GB/T1040.3.
Photo-thermal aging resistance: the test method comprises the steps of simulating all spectrums of sunlight by using a xenon lamp, placing a sample into a xenon lamp accelerated aging test box, wherein the aging time is 360 hours, the test conditions are air atmosphere, the temperature is 65 ℃, the light source distance is 25cm, the radiation intensity is 550W/m 2, testing the tensile strength again, and calculating the performance degradation rate=1-the tensile strength after aging/initial tensile strength.
The flame retardant performance test method comprises the following steps: the photo-thermal aging resistant modified polypropylene material obtained in each example was tested for limiting oxygen index with the comparative example material according to the ISO4589-2 standard. The results are shown in Table 1.
From the comparison of experimental data of examples 1-3 and comparative examples 1-4 in Table 1, it can be found that the photo-thermal aging resistant modified polypropylene material prepared by the invention has good tensile strength, photo-thermal aging resistance and flame retardance.
As can be seen from the comparison of the data of examples 1-3 and comparative example 1, the performance degradation rate of examples 1-3 is low, which indicates that the reaction of the meta-diphenol and the triazine structure on the pre-modified carbon nano tube forms a conjugated hydrogen bond six-membered ring, and has good ultraviolet light absorption effect, thereby improving the photo-thermal aging resistance effect.
The comparison of the data of the comparative example 1 and the comparative example 2 shows that the tensile strength and the limiting oxygen index of the comparative example 1 are high, the performance reduction rate is low, the modification of the carbon nano tube is illustrated, the organosilicon long chain is formed on the surface of the carbon nano tube, the dispersibility is improved, the modified carbon nano tube can be better reinforced, absorb light and dissipate heat, the photo-thermal aging resistance is improved, the imino on the organosilicon long chain can form electrostatic combination with the phosphate anion on the modified polypropylene powder, the tensile strength is improved, and the organosilicon long chain has good flame retardant effect.
As can be seen from the comparison of the data of examples 1-3 and comparative example 3, the performance degradation rate of examples 1-3 is low, which indicates that the grafting of N-N-butyl-2, 6-tetramethyl-4-piperidylamine on polypropylene has good free radical scavenging effect, thereby improving the photo-thermal aging resistance effect.
As can be seen from comparison of the data of comparative example 1 and comparative example 2, the tensile strength and limiting oxygen index of comparative example 1 are high, which demonstrates that phosphate can be grafted on polypropylene powder by modifying with photoinitiated grafting solution, flame retardance is improved, and phosphate anions formed by hydrolysis of phosphate can be electrostatically combined with imino groups on modified carbon nanotubes, thereby improving tensile strength.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. The preparation method of the photo-thermal aging resistant modified polypropylene material is characterized by comprising the following preparation steps:
(1) The method comprises the steps of (1) mixing carbon oxide nanotubes, 3-chloropropene and 20-25% sodium hydroxide aqueous solution in a mass ratio of 1: (3-4): (30-40), uniformly mixing, stirring at 50-60 ℃ for reaction for 4-6 hours at 200-300 r/min, centrifugally separating, washing with pure water for 3-5 times, and drying at 60-70 ℃ for 10-12 hours to obtain the allyl carbon nanotube; allyl carbon nano tube, tetramethyl disiloxane, N-hexane, N-dimethylformamide and chloroplatinic acid are mixed according to the mass ratio of 1: (3-4): (15-20): (15-20): (0.03-0.05), adding N, N' -diallyl-6-chloro-1, 3, 5-triazine-2, 4-diamine with the same molar weight as that of tetramethyl disiloxane, stirring and refluxing for 4-6 hours at 70-80 ℃ and 300-500 r/min, centrifugally separating, washing for 3-5 times with pure water, drying for 10-12 hours at 60-70 ℃ to obtain a pre-modified carbon nano tube, and mixing the pre-modified carbon nano tube, anhydrous aluminum trichloride and chlorobenzene according to a mass ratio of 1: (0.3 to 0.4): (10-12) uniformly mixing, stirring for 20-30 min at 0-3 ℃ at 200-300 r/min, adding resorcinol with the mass which is 0.6-0.8 times that of the pre-modified carbon nano tube, heating to 75-80 ℃, continuously stirring for reacting for 4-6 h, naturally cooling to room temperature, centrifugally separating, washing for 3-5 times with pure water, and drying for 10-12 h at 60-70 ℃ to obtain the modified carbon nano tube;
(2) Benzophenone, allyl dimethyl phosphate, p-chlorostyrene and acetone are mixed according to the mass ratio of 1: (3-4): (3-4): (30-40) uniformly mixing to prepare photoinitiated grafting solution; polypropylene powder and photoinitiated grafting solution are mixed according to the mass ratio of 1: (6-8 is uniformly mixed, an ultraviolet lamp with the wavelength of 365nm and the illumination intensity of 45mW/cm 2 is used as a light source, the irradiation is carried out for 6-8 min, after the irradiation is finished, stirring is carried out for 6-8 h at the temperature of 20-30 ℃ and the speed of 200-300 r/min, centrifugal separation is carried out, pure water and absolute ethyl alcohol are used for washing 3-5 times respectively, drying is carried out for 10-12 h at the temperature of 60-70 ℃ to obtain pre-modified polypropylene powder, the pre-modified polypropylene powder, N-N-butyl-2, 6-tetramethyl-4-piperidylamine, N-dimethylformamide and 10-12% sodium hydroxide aqueous solution are uniformly mixed according to the mass ratio of 1 (2-3) (8-10), stirring is carried out for 4-6 h at the temperature of 30-40 ℃ and the speed of 300-500 r/min, the pre-modified polypropylene powder is poured into pure water with the mass 50 times, stirring is carried out for 10-15 min at the speed of 300-500 r/min, and the filtering is used for washing 3-5% by respectively obtaining modified polypropylene powder;
(3) The modified carbon nano tube and modified polypropylene powder are mixed according to the mass ratio of 1: (10-20) uniformly mixing, adding into a double-screw extruder, melting and blending, wherein the temperature of the first region is 180-190 ℃, the temperature of the second region is 190-200 ℃, the temperature of the third region is 200-210 ℃, the temperature of the fourth region is 210-220 ℃, the temperature of the fifth region is 220-230 ℃, the screw rotating speed is 180-200 r/min, extruding and granulating, and obtaining the photo-thermal aging resistant modified polypropylene material.
2. The method for preparing a photo-thermal aging resistant modified polypropylene material according to claim 1, wherein the method for preparing the carbon oxide nanotubes in the step (1) comprises the following steps: the method comprises the following steps of (1) mixing carbon nanotubes, potassium permanganate and 95-98% of concentrated sulfuric acid according to a mass ratio of 1:1: (10-12), stirring at 50-60 ℃ for reaction for 4-6 hours at 200-300 r/min, centrifugally separating, washing with pure water for 3-5 times, adding hydrogen peroxide aqueous solution with the mass fraction of 20-25% which is 1-1.2 times that of the carbon nano tube, stirring at 0-3 ℃ for 10-15 minutes at 200-300 r/min, centrifugally separating, washing with pure water for 3-5 times, and drying at 60-70 ℃ for 10-12 hours.
3. The method for producing a photo-thermal aging resistant modified polypropylene material according to claim 1, wherein said polypropylene powder of step (2) is PC0580.
4. A photo-thermal aging resistant modified polypropylene material prepared by the preparation method of the photo-thermal aging resistant modified polypropylene material according to any one of claims 1 to 3.
5. The use of the photo-thermal aging resistant modified polypropylene material according to claim 4 in nonwoven fabrics.
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