Low-temperature-resistant anti-aging polypropylene plastic clothes hanger and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and discloses a low-temperature-resistant anti-aging polypropylene plastic clothes hanger and a preparation method thereof. The preparation method comprises the following steps: S1, adding an emulsifier into water, uniformly stirring, adding an initiator, acrylonitrile, butyl acrylate, styrene, allyl glycidyl ether and double-bond modified fluorocarbazole, reacting, and removing a solvent to prepare an anti-ultraviolet modifier; s2, adding hexamethylenediamine piperidine into xylene, uniformly stirring, adding the epoxy modified filler and acetic acid, stirring for reaction, taking a solid, and washing and drying to obtain a modified filler; s3, adding the modified filler and the anti-ultraviolet modifier into DMSO (dimethylsulfoxide), uniformly stirring, adding acetic acid, heating for reaction, and removing a solvent to obtain a premix; and mixing the premix with polypropylene, a compatilizer, an antioxidant and peroxide, and carrying out melt extrusion into a mold by using a twin-screw extruder to obtain the polypropylene plastic clothes hanger. The polypropylene plastic clothes hanger has the advantages of excellent strength, low temperature resistance and aging resistance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of high polymer materials, and discloses a low-temperature-resistant and anti-aging polypropylene plastic clothes hanger and a preparation method thereof. BACKGROUND

[0002] Polypropylene is a kind of general-purpose thermoplastic resin, has the advantages of low density, good molding processability and low cost, and is a mainstream raw material for producing plastic clothes hangers.

[0003] However, the pure polypropylene material has the following defects: (1) insufficient mechanical property: the plastic clothes hanger needs to bear the weight load of clothes for a long time in the use process, and the insufficient tensile strength of the polypropylene material can cause the clothes hanger to deform, crack or even break; (2) insufficient low-temperature resistance: in a low-temperature environment, the polypropylene material changes from a ductile state to a brittle state, and the impact resistance sharply decreases, so that the clothes hanger is easy to bend or break when used in cold regions; (3) insufficient anti-aging property: the polypropylene is easy to be degraded by ultraviolet radiation in the long-term use process, and the material is yellow, the surface is powdery, and the mechanical property is deteriorated, so that the normal clothes hanging demand cannot be met.

[0004] In summary, it is of great significance to study a polypropylene plastic clothes hanger with high strength and good low-temperature resistance and anti-aging property and a preparation method thereof. SUMMARY

[0005] The application aims to provide a low-temperature-resistant and anti-aging polypropylene plastic clothes hanger and a preparation method thereof, so as to solve the problems in the background.

[0006] In order to solve the above technical problems, the application provides the following technical scheme: a preparation method of a low-temperature-resistant and anti-aging polypropylene plastic clothes hanger, comprising the following steps: S1: adding an emulsifier into water and stirring uniformly, adding an initiator, acrylonitrile, butyl acrylate, styrene, allyl glycidyl ether and double bond modified fluorene, stirring and heating to 75-80 DEG C for 4-5 h, removing the solvent to obtain an anti-ultraviolet modifier; S2: adding a filler into a mixed solution of ethanol and water, adjusting the pH to 4-5, adding an epoxy silane coupling agent, stirring and heating to 50-55 DEG C for 6-8 h, taking the solid, washing and drying to obtain an epoxy modified filler; adding hexanediamine piperidine into dimethylbenzene and stirring uniformly, adding the epoxy modified filler and acetic acid, stirring and heating to 80-90 DEG C for 6-8 h, taking the solid, washing and drying to obtain a modified filler; S3: adding the modified filler and the anti-ultraviolet modifier into DMSO and stirring uniformly, adding acetic acid, heating to 80-90 DEG C for 4-6 h, removing the solvent to obtain a premix; mixing the premix with polypropylene, a compatilizer, an antioxidant and a peroxide, and melt extruding into a mold by using a double-screw extruder to obtain the polypropylene plastic clothes hanger.

[0007] More preferably, the UV-resistant modifier comprises the following raw materials in parts by weight: 0.2-0.3 parts emulsifier, 0.1-0.15 parts initiator, 2-3 parts acrylonitrile, 2-3 parts butyl acrylate, 0.5-1 part styrene, 0.5-1 part allyl glycidyl ether, and 0.8-1.5 parts double bond modified flucarbazole; wherein the emulsifier is sodium dodecylbenzenesulfonate and sodium allyl sulfonate in a mass ratio of (0.05-0.1):(0.15-0.2).

[0008] In a more optimized manner, the epoxy modified filler comprises the following raw materials in parts by weight: 4-6 parts filler and 0.2-0.25 parts epoxy silane coupling agent; the filler is titanium dioxide and mica in a mass ratio of (1-2):1. The modified filler comprises the following raw materials in parts by weight: 0.5-0.55 parts hexamethylenediamine piperidine, 10-15 parts xylene, 4-4.5 parts epoxy modified filler, and 0.01-0.015 parts acetic acid.

[0009] In a more optimized manner, the polypropylene plastic hanger comprises the following raw materials in parts by weight: 10-15 parts modified filler, 5-8 parts UV-resistant modifier, 80-90 parts polypropylene, 1-2 parts compatibilizer, 0.2-0.3 parts antioxidant, and 0.01-0.02 parts dicumyl peroxide.

[0010] In a more optimized manner, the preparation steps of the double-bond modified flucarbazole are as follows: under nitrogen protection, 3-fluorocarbazole and sodium hydride are added to DMF and stirred for 1-2 hours. Then, 11-bromo-1-undecene is added, the temperature is raised to 75-80°C and stirred for 2-3 hours. A saturated ammonium chloride solution is added and extracted. The organic phase is taken and the solvent is removed to obtain the double-bond modified flucarbazole.

[0011] In a more optimized manner, the double-bond modified flucarbazole comprises the following raw materials in parts by weight: 4-6 parts of 3-flucarbazole, 1-2 parts of sodium hydride, 80-100 parts of DMF, and 10-15 parts of 11-bromo-1-undecene.

[0012] More preferably, the polypropylene is homopolymer polypropylene or random copolymer polypropylene with a mass ratio of 1:(1~2).

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are: Polypropylene with homopolymer polypropylene and random copolymer polypropylene as matrix: Homopolymer polypropylene has high molecular chain regularity and good tensile strength, while random copolymer polypropylene has reduced chain segment regularity and higher flexibility and good low-temperature impact resistance. When the two are used together in a certain mass ratio, a material with strength, toughness and low-temperature resistance can be obtained. This method prepares modified fillers and UV-resistant modifiers, which are then premixed and added to polypropylene. The modified filler includes titanium dioxide and mica. Titanium dioxide has excellent ultraviolet light absorption capacity, while mica has a lamellar structure that can extend the light propagation path and improve the utilization rate of titanium dioxide. Simultaneously, the lamellar structure can act as a dispersion carrier, alleviating the aggregation of titanium dioxide. An epoxy-based silane coupling agent imbues the surfaces of titanium dioxide and mica with epoxy groups, which participate in the subsequent reaction with hexamethylenediamine piperidine. Hexamethylenediamine piperidine is a hindered amine light stabilizer that works synergistically with the inorganic filler and the UV-resistant modifier, resulting in excellent UV aging resistance. Furthermore, the hindered amine has significant steric hindrance, which, when attached to the surface of the inorganic filler, helps to reduce aggregation. In this step, the amount of hexamethylenediamine piperidine and the epoxy-modified filler is controlled to ensure that the surface of the resulting modified filler still contains active groups that can participate in the subsequent reaction with the UV-resistant modifier. In the UV-resistant modifier, the introduction of cyano groups into acrylonitrile can prevent UV damage to the main chain; the double-bond modified fluorocarbazole has a large π-conjugated system, which has strong stability and good UV absorption capacity, while the introduction of fluorine element improves low-temperature resistance; the introduction of butyl acrylate and styrene reduces the overall polarity, which improves the compatibility between the UV-resistant modifier and the polypropylene matrix, and improves the problems of reduced mechanical properties and easy migration and precipitation caused by poor compatibility; the introduction of sodium allyl sulfonate gives it a certain degree of dispersibility; the introduction of epoxy groups into allyl glycidyl ether helps the premixing and compounding of the UV-resistant modifier and modified filler in subsequent steps; The purpose of premixing the modified filler and UV-resistant modifier in this scheme is to improve their compatibility in polypropylene matrix materials, while also addressing the issues of easy migration and precipitation of conventional UV-resistant additives, thereby further enhancing the mechanical properties and UV resistance of the polypropylene matrix.

[0014] In summary, the polypropylene plastic hangers prepared by this method have good tensile strength, low-temperature resistance, and UV aging resistance. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] It should be noted that there are no special restrictions on the manufacturers of the raw materials involved in this invention. Exemplary examples include: sodium hydride (60% purity, dispersed in mineral oil); titanium dioxide (20-40nm); mica (5000 mesh); epoxy silane coupling agent: KH560; hexamethylenediamine piperidine (HMBTAD); homopolymer polypropylene (DX6E62); random copolymer polypropylene (CP2510GM); compatibilizer: PP-g-MAH; antioxidant: 1076. Unless otherwise specified, all figures below are parts by weight or mass ratios. Example 1: S1: Under nitrogen protection, 5 parts of 3-fluorocarbazole, 1.5 parts of sodium hydride, and 100 parts of DMF were stirred at 25°C for 1 hour. Then, 14 parts of 11-bromo-1-undecene were added, and the mixture was heated to 80°C and stirred for 3 hours. The mixture was then added to 300 parts of saturated ammonium chloride solution, extracted, and the organic phase was collected. The solvent was removed to obtain double-bond modified fluorocarbazole. Take 0.05 parts sodium dodecylbenzenesulfonate and 0.15 parts sodium allyl sulfonate, add them to 100 parts water, stir well, add 0.15 parts potassium persulfate, 3 parts acrylonitrile, 3 parts butyl acrylate, 0.5 parts styrene, 0.8 parts allyl glycidyl ether, and 1 part double bond modified fluorocarbazole, stir and heat to 75℃ for 5 hours, remove the solvent, and obtain the UV-resistant modifier. S2: Take titanium dioxide and mica in a mass ratio of 2:1, mix them to obtain filler, take 5 parts of filler, add 20 parts of ethanol and 1 part of water, adjust the pH to 5, add 0.2 parts of epoxy silane coupling agent, stir and heat to 55℃, react for 8 hours, take the solid, wash and dry to obtain epoxy modified filler. Take 0.55 parts of hexamethylenediamine piperidine, add it to 15 parts of xylene and stir well. Add 4 parts of epoxy modified filler and 0.01 parts of acetic acid, stir and heat to 90℃ for 8 hours. Take the solid, wash and dry it to obtain the modified filler. S3: Take 12 parts of modified filler and 6 parts of UV-resistant modifier, add them to DMSO, add 0.1 parts of acetic acid, heat to 90℃ and react for 6 hours, remove the solvent to obtain a premix; take 85 parts of polypropylene (homogeneous polypropylene and random copolymer polypropylene with a mass ratio of 1:2), 2 parts of compatibilizer, 0.2 parts of antioxidant, and 0.01 parts of dicumyl peroxide, mix them with the premix to obtain a base material, and melt-extrude it into a die using a twin-screw extruder to obtain a polypropylene plastic hanger; the processing temperature of the extruder from the feed port to the die port is 180, 195, 210, 210, and 220℃ respectively.

[0017] Example 2: S1: Under nitrogen protection, 5 parts of 3-fluorocarbazole, 1.5 parts of sodium hydride, and 100 parts of DMF were stirred at 25°C for 1 hour. Then, 14 parts of 11-bromo-1-undecene were added, and the mixture was heated to 80°C and stirred for 2 hours. The mixture was then added to 300 parts of saturated ammonium chloride solution, extracted, and the organic phase was collected. The solvent was removed to obtain double-bond modified fluorocarbazole. Take 0.1 parts sodium dodecylbenzenesulfonate and 0.15 parts sodium allyl sulfonate, add them to 100 parts water, stir well, add 0.15 parts potassium persulfate, 3 parts acrylonitrile, 3 parts butyl acrylate, 0.5 parts styrene, 1 part allyl glycidyl ether, and 0.8 parts double bond modified fluorocarbazole, stir and heat to 75℃ for 5 hours, remove the solvent to obtain the UV-resistant modifier; S2: Take titanium dioxide and mica in a mass ratio of 2:1, mix them to obtain filler, take 6 parts of filler, add 20 parts of ethanol and 1 part of water, adjust the pH to 5, add 0.25 parts of epoxy silane coupling agent, stir and heat to 55℃, react for 8 hours, take the solid, wash and dry to obtain epoxy modified filler. Take 0.5 parts of hexamethylenediamine piperidine, add it to 15 parts of xylene and stir well. Add 4 parts of epoxy modified filler and 0.01 parts of acetic acid, stir and heat to 90℃ for 8 hours. Take the solid, wash and dry it to obtain the modified filler. S3: Take 10 parts of modified filler and 5 parts of UV-resistant modifier, add them to DMSO, add 0.1 parts of acetic acid, heat to 90℃ and react for 6 hours, remove the solvent to obtain a premix; take 80 parts of polypropylene (homogeneous polypropylene and random copolymer polypropylene with a mass ratio of 1:2), 1 part of compatibilizer, 0.2 parts of antioxidant, and 0.01 parts of dicumyl peroxide, mix them with the premix to obtain a base material, and melt-extrude it into a die using a twin-screw extruder to obtain a polypropylene plastic hanger; the processing temperature of the extruder from the feed port to the die port is 180, 195, 210, 210, and 220℃ respectively.

[0018] Example 3: S1: Under nitrogen protection, 5 parts of 3-fluorocarbazole, 1.5 parts of sodium hydride, and 100 parts of DMF were stirred at 25°C for 1 hour. Then, 14 parts of 11-bromo-1-undecene were added, and the mixture was heated to 80°C and stirred for 3 hours. The mixture was then added to 300 parts of saturated ammonium chloride solution, extracted, and the organic phase was collected. The solvent was removed to obtain double-bond modified fluorocarbazole. Take 0.05 parts sodium dodecylbenzenesulfonate and 0.2 parts sodium allyl sulfonate, add them to 100 parts water, stir well, add 0.1 parts potassium persulfate, 3 parts acrylonitrile, 2 parts butyl acrylate, 1 part styrene, 0.5 parts allyl glycidyl ether, and 1.5 parts double bond modified fluorocarbazole, stir and heat to 75℃ for 5 hours, remove the solvent to obtain the UV-resistant modifier; S2: Take titanium dioxide and mica in a mass ratio of 2:1, mix them to obtain filler, take 4 parts of filler, add 20 parts of ethanol and 1 part of water, adjust the pH to 5, add 0.2 parts of epoxy silane coupling agent, stir and heat to 55℃, react for 8 hours, take the solid, wash and dry to obtain epoxy modified filler. Take 0.55 parts of hexamethylenediamine piperidine, add it to 15 parts of xylene and stir well. Add 4 parts of epoxy modified filler and 0.015 parts of acetic acid, stir and heat to 90℃ for 8 hours. Take the solid, wash and dry it to obtain the modified filler. S3: Take 15 parts of modified filler and 8 parts of UV-resistant modifier, add them to DMSO, add 0.1 parts of acetic acid, heat to 90℃ and react for 6 hours, remove the solvent to obtain a premix; take 90 parts of polypropylene (homogeneous polypropylene and random copolymer polypropylene with a mass ratio of 1:2), 2 parts of compatibilizer, 0.3 parts of antioxidant, and 0.01 parts of dicumyl peroxide, mix them with the premix to obtain a base material, and melt-extrude it into a die using a twin-screw extruder to obtain a polypropylene plastic hanger; the processing temperature of the extruder from the feed port to the die port is 180, 195, 210, 210, and 220℃ respectively.

[0019] Comparative Example 1 (using a mixture instead of modified filler, the remaining methods and steps are the same as in Example 1): S1: Under nitrogen protection, 5 parts of 3-fluorocarbazole, 1.5 parts of sodium hydride, and 100 parts of DMF were stirred at 25°C for 1 hour, 14 parts of 11-bromo-1-undecene were added, the temperature was raised to 80°C and stirred for 3 hours, then added to 300 parts of saturated ammonium chloride solution, extracted, and the organic phase was taken. The solvent was removed to obtain double bond modified fluorocarbazole. Take 0.05 parts sodium dodecylbenzenesulfonate and 0.15 parts sodium allyl sulfonate, add them to 100 parts water, stir well, add 0.15 parts potassium persulfate, 3 parts acrylonitrile, 3 parts butyl acrylate, 0.5 parts styrene, 0.8 parts allyl glycidyl ether, and 1 part double bond modified fluorocarbazole, stir and heat to 75℃ for 5 hours, remove the solvent, and obtain the UV-resistant modifier. S2: Take titanium dioxide and mica in a mass ratio of 2:1, mix them to obtain the filler; take 0.55 parts of hexamethylenediamine piperidine and 4 parts of the filler and mix them to obtain the mixture; S3: Take 12 parts of modified filler and 6 parts of UV-resistant modifier, add them to DMSO, add 0.1 parts of acetic acid, heat to 90℃ and react for 6 hours, remove the solvent to obtain a premix; take 85 parts of polypropylene (homogeneous polypropylene and random copolymer polypropylene with a mass ratio of 1:2), 2 parts of compatibilizer, 0.2 parts of antioxidant, and 0.01 parts of dicumyl peroxide, mix them with the premix to obtain a base material, and melt-extrude it into a die using a twin-screw extruder to obtain a polypropylene plastic hanger; the processing temperature of the extruder from the feed port to the die port is 180, 195, 210, 210, and 220℃ respectively.

[0020] Comparative Example 2 (no premixing, the rest of the steps are the same as in Example 1): S1: Under nitrogen protection, 5 parts of 3-fluorocarbazole, 1.5 parts of sodium hydride, and 100 parts of DMF were stirred at 25°C for 1 h, 14 parts of 11-bromo-1-undecene were added, the temperature was raised to 80°C and stirred for 3 h, and then added to 300 parts of saturated ammonium chloride solution. The mixture was extracted, the organic phase was taken, and the solvent was removed to obtain double bond modified fluorocarbazole. Take 0.05 parts sodium dodecylbenzenesulfonate and 0.15 parts sodium allyl sulfonate, add them to 100 parts water, stir well, add 0.15 parts potassium persulfate, 3 parts acrylonitrile, 3 parts butyl acrylate, 0.5 parts styrene, 0.8 parts allyl glycidyl ether, and 1 part double bond modified fluorocarbazole, stir and heat to 75℃ for 5 hours, remove the solvent, and obtain the UV-resistant modifier. S2: Take titanium dioxide and mica in a mass ratio of 2:1, mix them to obtain filler, take 5 parts of filler, add 20 parts of ethanol and 1 part of water, adjust the pH to 5, add 0.2 parts of epoxy silane coupling agent, stir and heat to 55℃, react for 8 hours, take the solid, wash and dry to obtain epoxy modified filler. Take 0.55 parts of hexamethylenediamine piperidine, add it to 15 parts of xylene and stir well. Add 4 parts of epoxy modified filler and 0.01 parts of acetic acid, stir and heat to 90℃ for 8 hours. Take the solid, wash and dry it to obtain the modified filler. S3: Take 12 parts of modified filler, 6 parts of UV-resistant modifier, 85 parts of polypropylene (homogeneous polypropylene and random copolymer polypropylene with a mass ratio of 1:2), 2 parts of compatibilizer, 0.2 parts of antioxidant, and 0.01 parts of dicumyl peroxide, mix them to obtain the base material, and melt-extrude it into the die using a twin-screw extruder to obtain a polypropylene plastic clothes hanger; the processing temperature of the extruder from the feed port to the die port is 180, 195, 210, 210, and 220℃ respectively.

[0021] Comparative Example 3 (hexamethylenediamine piperidine was added to an anti-UV modifier, and the remaining steps were the same as in Example 1): S1: Under nitrogen protection, 5 parts of 3-fluorocarbazole, 1.5 parts of sodium hydride, and 100 parts of DMF were stirred at 25°C for 1 hour, 14 parts of 11-bromo-1-undecene were added, the temperature was raised to 80°C and stirred for 3 hours, and then added to 300 parts of saturated ammonium chloride solution. The mixture was extracted, the organic phase was taken, and the solvent was removed to obtain double bond modified fluorocarbazole. Take 0.55 parts of hexamethylenediamine piperidine, add it to 15 parts of xylene and stir well. Add 0.2 parts of allyl glycidyl ether and 0.01 parts of acetic acid, stir and heat to 90℃ for 8 hours. Take the solid, wash and dry it to obtain double bond modified piperidine. Take 0.05 parts of sodium dodecylbenzenesulfonate and 0.15 parts of sodium allyl sulfonate, add them to 100 parts of water, stir evenly, add 0.15 parts of potassium persulfate, 3 parts of acrylonitrile, 3 parts of butyl acrylate, 0.5 parts of styrene, 0.8 parts of double bond modified piperidine, and 1 part of double bond modified flucarbazole, stir and heat to 75℃ for 5 hours, remove the solvent, and obtain the UV-resistant modifier; S2: Take titanium dioxide and mica in a mass ratio of 2:1, mix them to obtain filler, take 5 parts of filler, add 20 parts of ethanol and 1 part of water, adjust the pH to 5, add 0.2 parts of epoxy silane coupling agent, stir and heat to 55℃, react for 8 hours, take the solid, wash and dry to obtain epoxy modified filler. S3: Take 12 parts of epoxy modified filler and 6 parts of UV-resistant modifier, add them to DMSO, add 0.1 parts of acetic acid, heat to 90℃ and react for 6 hours, remove the solvent to obtain a premix; take 85 parts of polypropylene (homogeneous polypropylene and random copolymer polypropylene with a mass ratio of 1:2), 2 parts of compatibilizer, 0.2 parts of antioxidant, and 0.01 parts of dicumyl peroxide, mix them with the premix to obtain a base material, and melt-extrude it into a die using a twin-screw extruder to obtain a polypropylene plastic hanger; the processing temperature of the extruder from the feed port to the die port is 180, 195, 210, 210, and 220℃ respectively.

[0022] Comparative Example 4 (the filler was inoculated with an anti-UV modifier, and the remaining steps were the same as in Example 1): S1: Under nitrogen protection, 5 parts of 3-fluorocarbazole, 1.5 parts of sodium hydride, and 100 parts of DMF were stirred at 25°C for 1 hour. 14 parts of 11-bromo-1-undecene were added, the temperature was raised to 80°C, and the mixture was stirred for 3 hours. The mixture was then added to 300 parts of saturated ammonium chloride solution, extracted, and the organic phase was taken. The solvent was removed to obtain double-bond modified fluorocarbazole. Titanium dioxide and mica were mixed in a mass ratio of 2:1 to obtain a filler. Five parts of the filler were added to 20 parts of ethanol and 1 part of water to adjust the pH to 5. 0.2 parts of vinyltrimethoxysilane were added, stirred and heated to 55°C, and reacted for 8 hours. The solid was taken, washed, and dried to obtain a double bond modified filler. S2: Take 0.05 parts sodium dodecylbenzenesulfonate and 0.15 parts sodium allyl sulfonate, add them to 100 parts water, stir evenly, add 0.15 parts potassium persulfate, 3 parts acrylonitrile, 3 parts butyl acrylate, 0.5 parts styrene, 0.8 parts allyl glycidyl ether, 1 part double bond modified fluorocarbazole, and 15 parts double bond modified filler, stir and heat to 75℃ for 5 hours, remove the solvent, and obtain the UV-resistant modifier; S3: Take 2 parts hexamethylenediamine piperidine and 16 parts UV-resistant modifier, add them to DMSO, add 0.1 parts acetic acid, heat to 90℃ and react for 6 hours, remove the solvent to obtain a premix; take 85 parts polypropylene (homogeneous polypropylene and random copolymer polypropylene with a mass ratio of 1:2), 2 parts compatibilizer, 0.2 parts antioxidant, and 0.01 parts dicumyl peroxide, mix them with the premix to obtain a base material, and melt-extrude it into a die using a twin-screw extruder to obtain a polypropylene plastic hanger; the processing temperature of the extruder from the feed port to the die port is 180, 195, 210, 210, and 220℃ respectively.

[0023] Performance Test 1: The base materials prepared in Examples 1-3 and Comparative Examples 1-4 were melt-extruded into a die using a twin-screw extruder to prepare test samples. Tensile strength was tested according to GB / T1040.1 standard. A xenon arc lamp was used as the light source at a light intensity of 0.55 W / m². 2 At a detection point of 340nm, an accelerated photoaging test was conducted for 2000h, and then the tensile strength was tested again to calculate the retention rate and evaluate the anti-aging performance; see Table 1 for details. Table 1: As shown in the table above, in Comparative Example 1, a mixture was used instead of the modified filler. The mixture of hexamethylenediamine piperidine and the filler was directly added, resulting in a significant decrease in performance due to compatibility and migration issues. In Comparative Example 2, no premixing was performed, leading to a decrease in performance, highlighting the importance of this step. In Comparative Example 3, hexamethylenediamine piperidine was incorporated into the UV-resistant modifier. Due to its large steric hindrance, the polymerization was affected, leading to structural changes in the UV-resistant modifier and a decrease in performance. In Comparative Example 4, the filler was incorporated into the UV-resistant modifier, which also resulted in a decrease in performance, possibly due to the increased branching degree of the UV-resistant modifier, leading to decreased compatibility with polypropylene.

[0024] Performance Test 2: The base material prepared in Example 1 was melt-extruded into a mold using a twin-screw extruder to prepare test samples. The samples were subjected to simple beam 15J pendulum impact tests at -10, -20, and -30°C. None of the test samples broke or cracked, indicating that they have good low-temperature resistance.

[0025] In summary, this method produces a polypropylene plastic clothes hanger that is resistant to low temperatures, has good anti-aging properties, and high strength.

[0026] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a low-temperature resistant and anti-aging polypropylene plastic clothes hanger, characterized in that: Includes the following steps: S1: Add emulsifier to water and stir evenly. Add initiator, acrylonitrile, butyl acrylate, styrene, allyl glycidyl ether, and double bond modified flucarbazole. Stir to react, remove solvent, and obtain UV-resistant modifier. S2: Add the filler to a mixed solution of ethanol and water, adjust the pH to 4-5, add an epoxy silane coupling agent, stir the reaction, take the solid, wash and dry it to obtain the epoxy modified filler; add hexamethylenediamine piperidine to xylene and stir evenly, add epoxy modified filler and acetic acid, heat and stir the reaction, take the solid, wash and dry it to obtain the modified filler. S3: Add the modified filler and UV-resistant modifier to DMSO and stir until homogeneous. Add acetic acid, heat and stir to react, remove the solvent, and obtain a premix. Mix the premix with polypropylene, compatibilizer, antioxidant and peroxide, and melt-extrude into a mold using a twin-screw extruder to obtain a polypropylene plastic hanger.

2. The method for preparing a low-temperature resistant and anti-aging polypropylene plastic clothes hanger according to claim 1, characterized in that: The UV-resistant modifier comprises the following raw materials in parts by weight: 0.2-0.3 parts emulsifier, 0.1-0.15 parts initiator, 2-3 parts acrylonitrile, 2-3 parts butyl acrylate, 0.5-1 parts styrene, 0.5-1 parts allyl glycidyl ether, and 0.8-1.5 parts double bond modified flucarbazole; the emulsifier is sodium dodecylbenzenesulfonate and sodium allyl sulfonate in a mass ratio of (0.05-0.1):(0.15-0.2).

3. The method for preparing a low-temperature resistant and anti-aging polypropylene plastic clothes hanger according to claim 1, characterized in that: The epoxy modified filler comprises the following raw materials in parts by weight: 4-6 parts filler and 0.2-0.25 parts epoxy silane coupling agent; the filler is titanium dioxide and mica in a mass ratio of (1-2):

1. The modified filler comprises the following raw materials in parts by weight: 0.5-0.55 parts hexamethylenediamine piperidine, 10-15 parts xylene, 4-4.5 parts epoxy modified filler, and 0.01-0.015 parts acetic acid.

4. The method for preparing a low-temperature resistant and anti-aging polypropylene plastic clothes hanger according to claim 1, characterized in that: The resistant polypropylene plastic clothes hanger comprises the following raw materials in parts by weight: 10-15 parts modified filler, 5-8 parts UV-resistant modifier, 80-90 parts polypropylene, 1-2 parts compatibilizer, 0.2-0.3 parts antioxidant, and 0.01-0.02 parts peroxide.

5. The method for preparing a low-temperature resistant and anti-aging polypropylene plastic clothes hanger according to claim 1, characterized in that: The preparation steps of the double bond modified fluorocarbazole are as follows: under nitrogen protection, 3-fluorocarbazole and sodium hydride are added to DMF and stirred for 1-2 hours. Then, 11-bromo-1-undecene is added, the temperature is raised to 75-80℃ and stirred for 2-3 hours. A saturated ammonium chloride solution is added and extracted. The organic phase is taken and the solvent is removed to obtain double bond modified fluorocarbazole.

6. The method for preparing a low-temperature resistant and anti-aging polypropylene plastic clothes hanger according to claim 5, characterized in that: The double-bond modified fluorocarbazole comprises the following raw materials in parts by weight: 4-6 parts 3-fluorocarbazole, 1-2 parts sodium hydride, 80-100 parts DMF, and 10-15 parts 11-bromo-1-undecene.

7. The method for preparing a low-temperature resistant and anti-aging polypropylene plastic clothes hanger according to claim 1, characterized in that: The polypropylene is homopolymer polypropylene or random copolymer polypropylene with a mass ratio of 1:(1~2).

8. A polypropylene plastic hanger prepared by the method for preparing a low-temperature resistant and anti-aging polypropylene plastic hanger according to any one of claims 1 to 7.

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