Anti-aging plastic clothes hanger and preparation method thereof

Abstract

The invention relates to the field of plastic products, and particularly discloses an anti-aging plastic clothes hanger and a preparation method thereof. The anti-aging plastic clothes hanger is prepared from the following raw materials in parts by weight: 60 to 80 parts of polystyrene resin, 10 to 20 parts of PETG (Polyethylene Terephthalate Glycol), 10 to 20 parts of polycarbonate, 12 to 15 parts of SEBS (Styrene-Ethylene-Butylene-Styrene), 5 to 8 parts of compatibilizer, 5 to 10 parts of anti-aging agent, 20 to 30 parts of filler, 1 to 4 parts of lubricant, 1 to 4 parts of dispersant and 5 to 10 parts of anti-aging fiber. The anti-aging agent is prepared from an antioxidant 1076, an antioxidant 168, an ultraviolet absorbent 234, a light stabilizer 770 and an ultraviolet absorbent UVP-327 according to the mass ratio of (1 to 2.5) to (1 to 2.5) to (2.5 to 3) to (1 to 1.5) to (1 to 2). The anti-aging plastic clothes hanger has the advantages of being high in strength, not prone to breakage and high in heat aging resistance and ultraviolet aging resistance.

Description

Technical Field

[0001] The present application relates to the technical field of plastic products, and more specifically, to an aging-resistant plastic clothes hanger and a preparation method thereof. Background Art

[0002] Clothes hangers are an indispensable product in people's daily lives. Traditional hangers are mostly made of bamboo, wood or metal. The advantages and disadvantages of common hangers on the market are as follows: (1) Bamboo and wooden hangers: They are environmentally friendly, have natural patterns, are lightweight, and have good load-bearing capacity. However, due to limited resources, they require a large amount of natural wood, are prone to cracking or deformation when exposed to water, and are easily corroded by mold. (2) Metal hangers: They are strong and durable, but the processing cost is high, they are prone to rust and contaminate clothes, and their ends are very easy to scratch the user. Plastic hangers have low processing costs, are lightweight and easy to carry, and are not affected by mold, rust, etc., and have been widely used as hangers in different occasions.

[0003] Polystyrene (PS) can be easily made into hangers of various shapes through injection, extrusion and other processes to meet different design requirements. In addition, polystyrene has good stability and is not easy to deform, so it can maintain the shape and size of the hanger. In addition, polystyrene has high transparency, making the hanger itself more beautiful and able to show the color and style of the clothes.

[0004] In the prior art, the Chinese invention patent application document with application number CN2019101691870 discloses a special material for directly injection-molded foamed polystyrene all-plastic imitation wood hangers and its preparation method, which includes the following raw materials in parts by weight: 60-100 parts of polystyrene (PS), 0-40 parts of high-impact polystyrene (HIPS), 0-15 parts of K resin, 4-25 parts of inorganic filler, 1.1-3.5 parts of additives, 5-15 parts of toughening agent, 0.2-1.2 parts of coupling agent, 0.5-1.5 parts of dispersant, 0.1-0.5 parts of wood color powder, 0.2-1.5 parts of foaming agent, 0-3 parts of foaming regulator, and 0.5-1 part of wood fragrance.

[0005] The polystyrene imitation wood hanger material can be used to produce imitation wood hanger products through injection molding using an injection molding machine. However, polystyrene hangers have poor weather resistance and tend to turn yellow and turbid after long-term storage and exposure to sunlight. The ultraviolet rays in sunlight accelerate the aging process of polystyrene, causing its surface to harden, become brittle, and even crack, thereby affecting its appearance and performance. Summary of the Invention

[0006] In order to improve the aging resistance and service life of polystyrene hangers, the present application provides an aging-resistant plastic hanger and a preparation method thereof. In a first aspect, the present application provides an aging-resistant plastic clothes hanger, which adopts the following technical solution: An aging-resistant plastic clothes hanger comprises the following raw materials in parts by weight: 60-80 parts of polystyrene resin, 10-20 parts of PETG, 10-20 parts of polycarbonate, 12-15 parts of SEBS, 5-8 parts of a compatibilizer, 5-10 parts of an anti-aging agent, 20-30 parts of a filler, 1-4 parts of a lubricant, 1-4 parts of a dispersant, and 5-10 parts of an anti-aging fiber; The anti-aging agent includes antioxidant 1076, antioxidant 168, ultraviolet absorber 234, light stabilizer 770 and ultraviolet absorber UVP-327 in a mass ratio of 1-2.5:1-2.5:2.5-3:1-1.5:1-2.

[0007] By adopting the above technical solution, polystyrene resin has good processing fluidity, rigidity and mechanical strength, but low impact strength and easy stress cracking, while polycarbonate has high impact strength, good mechanical strength, excellent heat resistance, good thermal stability, and good light stability. Therefore, by blending polycarbonate with polystyrene, the rigidity and mechanical strength of polystyrene can be maintained, while the impact resistance and thermal stability of polystyrene can be improved, and its resistance to thermal aging can be enhanced. Under the action of the compatibilizer, polystyrene and polycarbonate form a two-phase co-continuous structure. SEBS has good compatibility with polystyrene, and SEBS has a significant toughening effect on the blend, which can improve the bending strength and tensile strength. PET G stands for polyethylene terephthalate-1,4-cyclohexanedimethanol, which has excellent toughness and impact resistance, can improve the toughness of the hanger, make it more able to withstand external forces and impacts during use, and is not easy to break. At the same time, it has better heat resistance, which can enhance the stability of the hanger in high temperature environments. PETG has excellent weather resistance and UV resistance, which can maintain the toughness of the hanger and prevent yellowing. PETG and polycarbonate are basically miscible in any proportion, which can reduce the cracking tendency of polycarbonate and improve fluidity. Therefore, polystyrene is blended with PETG and polycarbonate, SEBS, etc. to make a blended material to make the hanger have good heat resistance.

[0008] The anti-aging agent is a complex of antioxidant, UV absorber and light stabilizer. Light stabilizer 770 and antioxidant 168 can produce a synergistic effect. Hindered phenol and phosphite are used in combination. Hindered phenol can release hydrogen atoms to terminate oxidative free radicals to generate hydroperoxides, and phosphite reacts with hydroperoxides to generate inactive oxides. Light stabilizer 770 and UV absorber 234 are used in combination, which has a better anti-light aging effect. Hydroperoxide decomposition and UV absorption are good, indicating that UV absorbers and free radical capture can better interfere with the photooxidation cycle and improve the light resistance of the material. Therefore, the coordinated use of multiple antioxidants, light stabilizers and UV absorbers has a synergistic effect and can alleviate the downward trend of the impact strength and elongation at break of the hangers.

[0009] Optionally, the compatibilizer includes an epoxy reactive compatibilizer, ABS, and maleic anhydride grafted SEBS in a mass ratio of 1:0.2-0.4:0.6-1.

[0010] By adopting the above technical solution, one end of the epoxy reactive compatibilizer has an epoxy group and the other end has a styrene molecular chain segment. Therefore, one end of the epoxy group reacts with PETG and the other end contacts with polystyrene, which can play a good compatibilization role. ABS is an acrylonitrile-butadiene-styrene copolymer, which has good compatibility with PETG and contains styrene units, so that ABS and polystyrene have certain structural similarities, which is conducive to improving compatibility. In addition, ABS also has certain toughness and processing properties, which can complement PETG and improve impact strength. and processability; the compatibilizing ability of maleic anhydride-grafted SEBS significantly improves the impact, tensile, and flexural strengths of the blend, providing excellent toughening effects. Furthermore, maleic anhydride-grafted SEBS exhibits good compatibility with other SEBS. Therefore, SEBS strengthens the bonding between the maleic anhydride-grafted SEBS and the polystyrene phase, thereby increasing the interaction between the polystyrene and polycarbonate phases and favoring the formation of a co-continuous structure. This can induce more silver crazing and absorb energy, thereby improving impact strength and, to a certain extent, preventing silver crazing from developing into cracks. This improved compatibility between polystyrene, PETG, polycarbonate, and SEBS stabilizes the blend's structure, reducing performance degradation due to phase separation, helping to extend its service life, indirectly improving its anti-aging properties, and reducing aging caused by stress concentration.

[0011] Optionally, the anti-aging fiber includes basalt fiber and carbon fiber in a mass ratio of 1:1-2.

[0012] By adopting the above technical solutions, basalt fiber has strong UV resistance and can maintain good performance stability under ultraviolet radiation. It also has excellent high temperature resistance and a wide range of operating temperatures. Carbon fiber has excellent UV resistance and environmental aging resistance, and can maintain stable performance for a long time even in harsh environments, showing relatively outstanding durability. In addition, both carbon fiber and basalt fiber have excellent deformation resistance and impact resistance, which can effectively improve the load-bearing capacity and impact resistance of the hanger.

[0013] Optionally, the carbon fiber is pretreated as follows: After uniformly mixing carbon fiber and desulfurized waste rubber powder, hot pressing at 170-180°C and 13-15 MPa for 8-10 minutes to prepare fiber sheets, the mass ratio of carbon fiber to desulfurized waste rubber powder is 7:2-2.8; The fiber sheet is immersed in a dopamine hydrochloride solution, and a Tris buffer is added to adjust the pH to 8.5. After immersing for 20-24 hours, the fiber sheet is filtered, washed, vacuum-dried, and crushed.

[0014] By adopting the above technical solution, the surface of carbon fiber is inert, which is different from the surface properties of polystyrene resin, etc. Direct blending and incorporation will cause compatibility problems and it will be difficult to form a good bonding surface. The desulfurized waste rubber powder is mixed with carbon fiber and then hot pressed. The waste rubber powder can regain plasticity after desulfurization and is evenly filled on the surface of carbon fiber after hot pressing. As elastic particles, it can improve the stress absorption effect in carbon fiber. When the hanger is impacted by external force, the rubber particles can absorb and weaken the impact well, reducing the impact of external force on the hanger, improving the impact resistance, and enhancing the toughness of the hanger. Then, dopamine solution is used for impregnation, and the surface of the dopamine molecular fiber sheet self-polymerizes. The polydopamine layer is formed and evenly coated on the fiber sheet. Polydopamine has a shielding or absorption effect on ultraviolet light and can isolate the oxygen in the air from continuing to penetrate, thereby reducing the ultraviolet damage and thermal oxidation of the waste rubber powder, and avoiding the increase in thermal oxidation and ultraviolet aging of the hanger due to the addition of waste rubber particles. Moreover, the polydopamine layer contains rich functional groups, such as amino and hydroxyl groups. These functional groups can form hydrogen bonds and other interactions with the functional groups in the polystyrene molecules, which helps to form a stable interface layer between the carbon fiber and the polystyrene, improve the compatibility of the carbon fiber in the blends such as polystyrene, thereby improving the interface bonding strength and bending strength, and improving the overall performance stability of the material.

[0015] Optionally, after the carbon fiber and desulfurized waste rubber powder are evenly mixed, fluorinated silica nanoparticles are added, mixed evenly, hot pressed at 170-180° C. and 13-15 MPa for 8-10 minutes, and crushed, and the mass ratio of carbon fiber to fluorinated silica nanoparticles is 7:0.2-1.

[0016] By adopting the above technical solution, fluorine atoms are introduced into the fluorinated silica nanoparticles, which have strong electronegativity, so that the surface energy of the silica nanoparticles is reduced. When hot-pressed with waste rubber powder, the interface strength between the waste rubber powder and the carbon fiber can be increased. At the same time, the surface roughness of the carbon fiber is also increased, and the surface energy of the carbon fiber is reduced. When the carbon fiber is immersed in the dopamine solution, the dopamine solution can be loaded more firmly, which facilitates the dispersion of the carbon fiber in the polystyrene. Moreover, the fluorinated silica nanoparticles loaded on the carbon fiber can further improve the impact resistance of the carbon fiber.

[0017] Optionally, the desulfurization method of the waste rubber powder is at least one of microwave treatment, desulfurization agent treatment and microwave-assisted desulfurization agent.

[0018] By adopting the above technical scheme, microwave activation of rubber powder is a physical radiation modification method, which can selectively heat and break specific SS bonds and SC bonds in the rubber powder vulcanization network without destroying the CC bonds on the main chain of the molecule, thereby destroying the three-dimensional network cross-linking structure of the vulcanized rubber and regaining plasticity, thereby achieving the purpose of desulfurization modification of the rubber powder; the desulfurizer modification is to break the existing cross-linking bonds, destroy the three-dimensional cross-linking structure, make the rubber powder plastic, and have the ability to be re-vulcanized, and the regeneration activator 2,2'-disulfide (6-tert-butyl-p-cresol) is easy to break the polysulfide bonds with weaker bond energy in the rubber powder under the action of mechanical force, generating sulfur free radicals, and the free radicals split by the desulfurizer are easy to combine with the sulfur free radicals, become the acceptor of large molecular free radicals, and cause chain free radical termination reaction. While oxidizing and breaking the chain, the large molecular free radicals are stabilized, thereby accelerating the breaking speed of the cross-linking bonds and realizing the regeneration desulfurization activation of the rubber powder.

[0019] Optionally, the basalt fiber is pretreated as follows: The basalt fiber is treated with acid, immersed in a titanium dioxide precursor solution, subjected to microwave reaction at 200-220°C for 20-30 minutes, cooled, filtered, washed, dried, and calcined at 450-480°C for 40-60 minutes to obtain a composite fiber; The silica sol is dissolved in distilled water, and the composite fiber is added thereto. The mixture is uniformly mixed and then subjected to gel treatment. The mixture is freeze-dried and then immersed in an ethanol solution of trimethylchlorosilane, and then washed and dried.

[0020] By adopting the above technical solution, the basalt fiber is first treated with acid to increase its surface roughness and improve the loading capacity of titanium dioxide. The titanium dioxide particles are evenly coated on the fiber surface, and the grains are tightly bonded, so that the basalt fiber has a larger specific surface area and enhanced photocatalytic performance. Then, silica sol is used to prepare a porous basalt fiber material by freeze-drying. Under the action of silica sol, the composite fibers are mixed to form a three-dimensional structure. The silica sol plays the role of bonding the fibers to build the overall skeleton framework. After freeze-drying, a porous aerogel is formed, which is evenly filled in the gaps between the fibers. The two form a tight bond, so that the fiber skeleton is tightly wrapped by the aerogel, reducing direct contact between the fibers, reducing the thermal conductivity efficiency of the basalt fiber, reducing heat transfer, and slowing down the thermal oxidation rate.

[0021] Optionally, the titanium dioxide precursor solution comprises the following raw materials in parts by weight: 2.4-2.5 parts of titanium sulfate, 3.7-4 parts of disodium ethylenediaminetetraacetic acid, 1.4-1.6 parts of urea, 0.5-1 part of agarose, 1.2-1.5 parts of water glass, and 150-180 parts of deionized water.

[0022] By adopting the above technical solution, agarose and water glass are added to the precursor solution. Agarose, as a low-temperature binder, can increase the viscosity of the precursor solution, improve the adhesion strength between the precursor solution and the basalt fiber, and can also bond and fix the basalt fiber to overlap the overall structure of the skeleton. Agarose can be used as a porogen at high temperature. After heat treatment, it decomposes to form carbon dioxide and water, and does not leave impurities inside the skeleton. At the same time, it plays a certain pore-forming role, increases the porosity of the composite fiber, and improves the thermal insulation effect. Water glass, as a high-temperature binder, can melt and flow to each fiber overlap point at high temperature, playing a secondary bonding role, so that the composite fiber can withstand greater external stress and can increase the load strength of titanium dioxide on the surface of the basalt fiber.

[0023] Optionally, the filler is selected from at least one of calcium carbonate, titanium dioxide, silicon dioxide, bentonite, talc and attapulgite; The dispersant is selected from at least one of stearic acid, paraffin oil, and white oil; The lubricant is selected from at least one of calcium stearate, dioctyl phthalate, zinc stearate, ethylene bisstearamide and polyethylene wax.

[0024] In a second aspect, the present application provides a method for preparing an aging-resistant plastic hanger, which adopts the following technical solution: A method for preparing an aging-resistant plastic hanger comprises the following steps: The polystyrene and polycarbonate are dried separately and then mixed with PETG and SEBS, and an anti-aging agent, a compatibilizer, a filler, a lubricant, a dispersant and an anti-aging fiber are added, mixed evenly, extruded and granulated to prepare a blend; The blend is injected into a mold, cooled, demolded, and subjected to surface treatment to produce an aging-resistant plastic hanger.

[0025] By adopting the above technical solution, the raw materials are mixed evenly and then extruded into granules, which is more conducive to exerting the functions of each component and the interaction between the components, thereby improving the strength and durability of the plastic hanger, avoiding the long-term impact of sunlight on the color of the plastic hanger, and suppressing the self-heating reaction of the plastic itself, so that the prepared plastic hanger is more durable.

[0026] In summary, this application has the following beneficial effects: 1. Since this application uses polystyrene as the main material and adds PETG, polycarbonate and SEBS, compatibilizer, anti-aging fiber and other raw materials, PETG and polycarbonate can improve the impact resistance, tensile strength and bending resistance of the hanger, and specific amounts of antioxidant 1076, antioxidant 168, UV absorber 234, light stabilizer 770 and UV absorber UVP-327 are used as antioxidants. The antioxidants, UV absorbers and light stabilizers work together to reduce UV aging and heat aging, making the hanger more durable.

[0027] 2. In this application, a specific dosage ratio of epoxy reactive compatibilizer, ABS and maleic anhydride grafted SEBS is preferably used as a compatibilizer, which can effectively improve the compatibility between polystyrene, PETG, polycarbonate and SEBS, so that the manufactured plastic hanger has high impact strength, strong toughness and good crack resistance.

[0028] 3. In this application, waste rubber powder, fluorinated silica nanoparticles and polydopamine are preferably used to pretreat carbon fibers, and titanium dioxide and silica aerogel are used to pretreat basalt fibers, which can further enhance the compatibility and dispersibility of carbon fibers and basalt fibers in blends such as polystyrene, improve the mechanical strength of the hanger, and enhance the hanger's resistance to UV aging and thermal aging. DETAILED DESCRIPTION

[0029] The following examples further illustrate the present application in detail. Example

[0030] Example 1: An aging-resistant plastic hanger, the raw material dosage is shown in Table 1, wherein the polystyrene resin is selected from Zhenjiang Chimei, model PG-383M, and the melt flow rate (200°C, 10kg) is 21g / 10min, PETG is selected from South Korea SK, model S2008, polycarbonate is bisphenol A type PC, selected from Bayer, Germany, model Makrolon2407, SEBS is selected from Baling Petrochemical, model YH503, the anti-aging agent includes antioxidant 1076, antioxidant 168, ultraviolet absorber 234, light stabilizer 770 and ultraviolet absorber UVP-327 in a mass ratio of 2.5:2.5:3:1.5:1, and the compatibilizer includes The mass ratio of the epoxy reactive compatibilizer, ABS and maleic anhydride grafted SEBS is 1:0.4:1, the epoxy reactive compatibilizer is selected from BASF, model ADR-4468, with a molecular weight of 7000, ABS is selected from Chi Mei in Taiwan, China, model PA-747, and the melt flow rate (200°C, 10kg) is 12g / 10min, maleic anhydride grafted SEBS is selected from Zhejiang Wangyang Polymer Materials, model CPT-GT1190, the filler is titanium dioxide, the lubricant is zinc stearate, the dispersant is paraffin oil, and the anti-aging fiber includes basalt fiber and carbon fiber in a mass ratio of 1:2, the basalt fiber is 6mm long, and the carbon fiber is 3mm long.

[0031] The method for preparing the above-mentioned aging-resistant plastic hanger comprises the following steps: The polystyrene was dried at 70°C for 3 hours, and the polycarbonate was dried at 100°C for 4 hours. The dried polystyrene and polycarbonate were mixed with PETG and SEBS, and an anti-aging agent, a compatibilizer, a filler, a lubricant, a dispersant and an anti-aging fiber were added. After uniform mixing, the mixture was extruded and granulated to obtain a blend. The temperatures of each zone of the extruder were 180°C, 245°C, 245°C, 250°C, 250°C, 250°C, 250°C, 250°C, and 245°C. The screw speed was 180 r / min and the feeding rate was 30 r / min. The blend was injected into a mold, cooled, demolded, and surface treated to produce an aging-resistant plastic hanger. The temperatures in each zone during injection molding were: 180°C, 245°C, 245°C, and 250°C, the injection pressure was 20 MPa, the holding pressure was 30 MPa, and the holding time was 20 s.

[0032] Table 1 Raw material dosage of aging-resistant plastic hangers Example 2: An aging-resistant plastic hanger, the raw materials are as shown in Table 1, wherein the polystyrene resin is selected from Zhenjiang Chimei, model PG-383M, and the melt flow rate (200°C, 10kg) is 21g / 10min, PETG is selected from South Korea SK, model S2008, polycarbonate is bisphenol A type PC, selected from Bayer, Germany, model Makrolon2407, SEBS is selected from Baling Petrochemical, model YH503, the anti-aging agent includes antioxidant 1076, antioxidant 168, ultraviolet absorber 234, light stabilizer 770 and ultraviolet absorber UVP-327 in a mass ratio of 1:1:2.5:1:2, and the compatibilizer includes a mass ratio of The epoxy reactive compatibilizer, ABS and maleic anhydride grafted SEBS are selected from BASF in a ratio of 1:0.2:0.6. The epoxy reactive compatibilizer is selected from BASF, model ADR-4468, with a molecular weight of 7000. ABS is selected from Chi Mei in Taiwan, China, model PA-747, with a melt flow rate (200°C, 10kg) of 12g / 10min. Maleic anhydride grafted SEBS is selected from Zhejiang Wangyang Polymer Materials, model CPT-GT1190. The filler is calcium carbonate, the lubricant is calcium stearate, the dispersant is white oil, and the anti-aging fiber includes basalt fiber and carbon fiber in a mass ratio of 1:1. The basalt fiber is 6mm in length and the carbon fiber is 3mm in length.

[0033] The method for preparing the above-mentioned aging-resistant plastic hanger comprises the following steps: The polystyrene was dried at 70°C for 3 hours, and the polycarbonate was dried at 100°C for 4 hours. The dried polystyrene and polycarbonate were mixed with PETG and SEBS, and an anti-aging agent, a compatibilizer, a filler, a lubricant, a dispersant and an anti-aging fiber were added. After uniform mixing, the mixture was extruded and granulated to obtain a blend. The temperatures of each zone of the extruder were 180°C, 245°C, 245°C, 250°C, 250°C, 250°C, 250°C, 250°C, and 245°C. The screw speed was 180 r / min and the feeding rate was 30 r / min. The blend was injected into a mold, cooled, demolded, and surface treated to produce an aging-resistant plastic hanger. The temperatures in each zone during injection molding were: 180°C, 245°C, 245°C, and 250°C, the injection pressure was 20 MPa, the holding pressure was 30 MPa, and the holding time was 20 s.

[0034] Example 3-4: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the amounts of raw materials used are as shown in Table 1.

[0035] Example 5: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the compatibilizer includes an epoxy-type reactive compatibilizer and maleic anhydride-grafted SEBS in a mass ratio of 1:1.

[0036] Example 6: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the compatibilizer includes an epoxy-type reactive compatibilizer and ABS in a mass ratio of 1:1.4.

[0037] Example 7: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the compatibilizer includes ABS and maleic anhydride-grafted SEBS in a mass ratio of 1.4:1.

[0038] Example 8: An aging-resistant plastic clothes hanger, which differs from Example 1 in that carbon fiber is used in an equal amount to replace basalt fiber in the aging-resistant fiber.

[0039] Example 9: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the carbon fibers are pretreated as follows: (1) 50 g of waste rubber powder with a particle size of 100 μm was mixed with 5 g of 2,2'-bis(6-tert-butyl-p-cresol) disulfide and microwaved at 700 W for 3 min to obtain desulfurized waste rubber powder. The waste rubber powder was obtained by crushing waste tires. (2) The carbon fibers were immersed in acetone, heated and boiled for 1 h, washed with deionized water, dried at 80°C, and then evenly mixed with degummed waste rubber powder. The mixture was then hot-pressed at 170°C and 15 MPa for 10 min to obtain a fiber sheet. The mass ratio of the carbon fibers to the degummed waste rubber powder was 7:2.8. (3) The fiber sheet was immersed in a 2 g / L dopamine hydrochloride solution, and a 1.2 g / L Tris buffer solution was added to adjust the pH value to 8.5. After immersion for 24 h, the fiber sheet was filtered, washed with deionized water, and vacuum-dried at 80°C, and crushed to 70 μm.

[0040] Example 10: An aging-resistant plastic hanger, which differs from Example 1 in that the carbon fibers are pretreated as follows: (1) 50 g of waste rubber powder with a particle size of 100 μm and 5 g of 2,2′-bis(6-tert-butyl-p-cresol) disulfide are mixed uniformly and microwave-treated at a power of 750 W for 2 min to obtain desulfurized waste rubber powder, wherein the waste rubber powder is obtained by crushing waste tires; (2) The carbon fibers were immersed in acetone and heated to boil for 1 h, then washed with deionized water, dried at 80°C, mixed evenly with degummed waste rubber powder, and hot pressed at 180°C and 13 MPa for 8 min to obtain fiber sheets. The mass ratio of carbon fibers to degummed waste rubber powder was 7:2. (3) The fiber sheet was immersed in a 2 g / L dopamine hydrochloride solution, and a 1.2 g / L Tris buffer solution was added to adjust the pH value to 8.5. After immersion for 24 h, the fiber sheet was filtered, washed with deionized water, and vacuum-dried at 80°C, and crushed to 70 μm.

[0041] Example 11: An aging-resistant plastic hanger. The difference from Example 9 is that the carbon fiber is pretreated as follows: The carbon fiber was immersed in acetone, heated and boiled for 1 hour, washed with deionized water, dried at 80°C, and then immersed in a 2 g / L dopamine hydrochloride solution. A 1.2 g / L Tris buffer solution was added to adjust the pH value to 8.5. After immersion for 24 hours, it was filtered, washed with deionized water, and dried in a vacuum at 80°C.

[0042] Example 12: An aging-resistant plastic hanger. The difference from Example 9 is that the carbon fiber is pretreated as follows: (1) 50 g of waste rubber powder with a particle size of 100 μm was mixed with 5 g of 2,2'-bis(6-tert-butyl-p-cresol) disulfide and microwaved at 700 W for 3 min to obtain desulfurized waste rubber powder. The waste rubber powder was obtained by crushing waste tires. (2) After the carbon fiber and the degummed waste rubber powder were evenly mixed, they were hot pressed at 170°C and 15 MPa for 10 min and crushed to 70 μm. The mass ratio of the carbon fiber to the degummed waste rubber powder was 7:2.8.

[0043] Example 13: An aging-resistant plastic hanger, which differs from Example 9 in that step (2) is: after mixing carbon fiber and degummed waste rubber powder evenly, add fluorinated silica nanoparticles, mix evenly, hot press at 170°C and 15MPa for 10 minutes, and crush to 70μm, the mass ratio of carbon fiber to degummed waste rubber powder is 7:2.8, the mass ratio of carbon fiber to fluorinated silica nanoparticles is 7:0.2, HDPE is selected from ExxonMobil of the United States, model HTA-016, melt flow rate (190°C, 2.16Kg) is 20g / 10min, and fluorinated silica nanoparticles are prepared by the following method: 4ml of ammonia water is added to 100mL of 75% ethanol, the temperature is raised to 50°C, and after keeping the temperature constant for 5min, 3mL of tetraethyl orthosilicate is added dropwise, stirred at 400rpm at 50°C for 2h, and 100μL of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane was reacted for 3 hours, cooled to room temperature, centrifuged for 10 minutes, resuspended with anhydrous ethanol, and centrifuged three times. The nanoparticles were dialyzed in anhydrous ethanol using a dialysis bag with a molecular weight cutoff of 14,000 for 24 hours, and the anhydrous ethanol solution was changed twice to obtain fluorinated silica nanoparticles.

[0044] Example 14: An aging-resistant plastic hanger, which differs from Example 9 in that step (2) is: after mixing carbon fiber and degummed waste rubber powder evenly, add fluorinated silica nanoparticles, mix evenly, hot press at 180°C and 13MPa for 8min, and crush to 70μm, the mass ratio of carbon fiber to degummed waste rubber powder is 7:2, the mass ratio of carbon fiber to fluorinated silica nanoparticles is 7:1, HDPE is selected from ExxonMobil of the United States, model HTA-016, melt flow rate (190°C, 2.16Kg) is 20g / 10min, and fluorinated silica nanoparticles are prepared by the following method: 4ml of ammonia water is added to 100mL of 75% ethanol, the temperature is raised to 50°C, and after keeping the temperature constant for 5min, 3mL of tetraethyl orthosilicate is added dropwise, stirred at 400rpm at 50°C for 2h, and 100μL of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane was reacted for 3 hours, cooled to room temperature, centrifuged for 10 minutes, resuspended with anhydrous ethanol, and centrifuged three times. The nanoparticles were dialyzed in anhydrous ethanol using a dialysis bag with a molecular weight cutoff of 14,000 for 24 hours, and the anhydrous ethanol solution was changed twice to obtain fluorinated silica nanoparticles.

[0045] Example 15: An aging-resistant plastic clothes hanger, which differs from Example 14 in that the basalt fiber is pretreated as follows: (1) Basalt fiber was immersed in anhydrous ethanol and ultrasonically vibrated for 20 min to remove impurities such as oil. After filtration, 0.1 mol / l HF solution was added dropwise to the basalt fiber, heated in a water bath at 55 °C for 15 min, washed with deionized water 5 times, and soaked in distilled water for 12 h before use; (2) The acid-treated basalt fiber was immersed in a titanium dioxide precursor solution, microwave-treated at 220°C for 30 min, cooled to room temperature, filtered, washed with distilled water, and dried in air for 12 h. The temperature was raised to 450°C at a rate of 5°C / min and calcined for 60 min to obtain a composite fiber. The titanium dioxide precursor solution was prepared as follows: 0.24 kg of titanium sulfate was rapidly stirred with 15 kg of distilled water, 0.37 kg of disodium ethylenediaminetetraacetate and 0.14 kg of urea, 0.1 kg of agarose, and 0.15 kg of water glass were added, sealed, and magnetically stirred at room temperature until completely dissolved. The mass ratio of the acid-treated basalt fiber to titanium sulfate was 1:1.2. (3) The silica sol was dissolved in distilled water, and the composite fiber was added and mixed evenly, and then subjected to gel treatment. After freeze-drying for 14 hours, the silica sol was immersed in an ethanol solution of trimethylchlorosilane (volume ratio of 1:9), washed and dried. The silica sol was a neutral silica sol selected from Guangzhou Fule Chemical Technology, with the product number WL-1030. The mass ratio of the composite fiber to the silica sol was 8:1.

[0046] Example 16: An aging-resistant plastic clothes hanger, which differs from Example 15 in that no agarose is added to the titanium dioxide precursor solution.

[0047] Example 17: An aging-resistant plastic clothes hanger, which differs from Example 15 in that water glass is not added to the titanium dioxide precursor solution.

[0048] Example 18: An aging-resistant plastic hanger. The difference from Example 15 is that the pretreatment method of basalt fiber is as follows: (1) Basalt fiber was immersed in anhydrous ethanol and ultrasonically vibrated for 20 min to remove impurities such as oil. After filtration, 0.1 mol / l HF solution was added dropwise to the basalt fiber, heated in a water bath at 55 °C for 15 min, washed with deionized water 5 times, and soaked in distilled water for 12 h before use; (2) The silica sol was dissolved in distilled water, and the acid-treated basalt fiber was added. After mixing evenly, the mixture was subjected to gel treatment. After freeze-drying for 14 hours, the mixture was immersed in an ethanol solution of trimethylchlorosilane (volume ratio of 1:9), washed, and dried. The silica sol was a neutral silica sol selected from Guangzhou Fule Chemical Technology Co., Ltd. with a product number of WL-1030. The mass ratio of the acid-treated basalt fiber to the silica sol was 8:1.

[0049] Example 19: An aging-resistant plastic hanger. The difference from Example 15 is that the pretreatment method of basalt fiber is as follows: (1) Basalt fiber was immersed in anhydrous ethanol and ultrasonically vibrated for 20 min to remove impurities such as oil. After filtration, 0.1 mol / l HF solution was added dropwise to the basalt fiber, heated in a water bath at 55 °C for 15 min, washed with deionized water 5 times, and soaked in distilled water for 12 h before use; (2) The acid-treated basalt fiber was immersed in a titanium dioxide precursor solution, microwave-treated at 220°C for 30 min, cooled to room temperature, filtered, washed with distilled water, and dried in air for 12 h. The temperature was raised to 450°C at a rate of 5°C / min and calcined for 60 min. The titanium dioxide precursor solution was prepared as follows: 0.24 kg of titanium sulfate was rapidly stirred with 15 kg of distilled water, 0.37 kg of disodium ethylenediaminetetraacetic acid and 0.14 kg of urea, 0.1 kg of agarose, and 0.15 kg of water glass were added, sealed, and magnetically stirred at room temperature until completely dissolved. The mass ratio of the acid-treated basalt fiber to titanium sulfate was 1:1.2.

[0050] Comparative Example Comparative Example 1: An aging-resistant plastic clothes hanger, which differs from Example 1 in that an equal amount of antioxidant 1010 is used in the anti-aging agent to replace the ultraviolet absorber 234, the light stabilizer 770 and the ultraviolet absorber UVP-327.

[0051] Comparative Example 2: An aging-resistant plastic clothes hanger, which differs from Example 1 in that an equal amount of ultraviolet absorber 234 is used to replace antioxidant 1076 and antioxidant 168.

[0052] Comparative Example 3: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the anti-aging agent includes antioxidant 1076, antioxidant 168, ultraviolet absorber 234 and light stabilizer 770 in a mass ratio of 2.5:2.5:3:1.5.

[0053] Comparative Example 4: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the anti-aging agent includes antioxidant 1076 and ultraviolet absorber 324 in a mass ratio of 5:5.5.

[0054] Comparative Example 5: An aging-resistant plastic clothes hanger, which differs from Example 1 in that the anti-aging agent includes antioxidant 168 and ultraviolet absorber 770 in a mass ratio of 5:5.5.

[0055] Performance testing Plastic hangers were prepared according to the methods in the examples and comparative examples, and performance tests were performed according to the following methods. The test results are recorded in Table 2.

[0056] 1. Notched impact strength: tested in accordance with GB / TT1843-2008, the specimen size is 63.5mm×12.7mm×4mm, the notch type is V-shaped, and the notch retention width is 10.2mm.

[0057] 2. Tensile strength and elongation at break: Tested in accordance with ASTM D638, with a test speed of 5 mm / min, a distance between fixtures of 110 mm, and a Type I specimen.

[0058] 3. Heat aging test: The injection molded specimens are fixed with clips and hung on the rotating frame of the aging box, and aged in a hot air aging box. The test standard is in accordance with GB / T7141-92 "Plastics Hot Air Exposure Test Method". The test aging temperature is 70°C and the aging time is 4 days. The impact strength and elongation at break of the specimens after heat aging are recorded, and the decrease rate of the impact strength and elongation at break after heat aging compared with those before the test is calculated.

[0059] 4. UV aging test: The injection molded specimens were fixed with tools and aged in a fluorescent UV lamp climate chamber. According to GB / T16422.3-1997 "Plastics laboratory light source exposure test method Part 3: Fluorescent UV lamp test", the light source was type I lamp, UV-A340, the exposure temperature was 50 ° C, and the irradiation intensity was 0.83W / m 2 / nm, aging time is 4d, the impact strength and elongation at break of the specimens after UV aging are recorded, and the decrease rate of the impact strength and elongation at break after UV aging compared with those before the test is calculated.

[0060] Table 2 Performance test results of aging-resistant plastic hangers As can be seen from the data in Table 2, the plastic hangers prepared using different raw material amounts in Examples 1-4 have strong initial impact strength, high tensile strength and elongation at break, and good mechanical properties. Moreover, after aging in hot air for 4 days and aging under UV light for 4 days, the notched impact strength and elongation at break decrease little, indicating that the plastic hangers have good resistance to heat and oxygen aging and UV aging.

[0061] In Example 5, compared with Example 1, epoxy-type reactive compatibilizer and maleic anhydride grafted SEBS were used as compatibilizers. It can be seen that the impact strength and tensile strength of the plastic hanger decreased. This shows that adding ABS as a compatibilizer can effectively improve the compatibility of materials such as polystyrene and enhance the mechanical strength of the hanger.

[0062] Compared with Example 1, Example 6 uses an equal amount of ABS to replace the maleic anhydride grafted SEBS, and in Comparative Example 7, an equal amount of ABS is used to replace the epoxy reactive compatibilizer. It can be seen from the data in Table 2 that the initial notched impact strength of the materials prepared in Example 6 and Example 7 decreases, and the tensile strength is weakened, and the UV aging resistance and thermal oxidation resistance are slightly weakened.

[0063] Compared with Example 1, Example 8 uses carbon fiber as the anti-aging fiber. It can be seen from the data in Table 2 that the impact resistance and tensile strength of the plastic hanger prepared in Example 8 are slightly weakened, and after thermal aging and UV aging, the impact strength and elongation at break are significantly reduced.

[0064] Compared with Example 1, Examples 9 and 10 use desulfurized waste rubber powder and polydopamine to pretreat the carbon fibers. It can be seen that the plastic hangers prepared in Examples 9 and 10 have enhanced impact resistance, further improved tensile resistance, and improved UV aging resistance.

[0065] Compared with Example 9, Example 11 only uses dopamine hydrochloride solution to treat the carbon fiber, and no waste rubber powder is hot-pressed. The data in Table 2 show that the impact strength and tensile strength of the plastic hanger prepared in Example 11 decrease, and the decrease in mechanical strength after ultraviolet and thermal aging is improved, indicating that treating the carbon fiber can improve the mechanical strength and aging resistance of the hanger.

[0066] Compared with Example 9, Example 12 only uses waste rubber powder mixed with carbon fiber and then hot pressed and crushed. It can be seen from the test that the impact resistance of the hanger does not change very obviously, but after thermal oxidation and UV aging, the impact strength and elongation at break of the hanger deteriorate.

[0067] Compared with Example 9, Examples 13 and 14 further added fluorinated silica nanoparticles during the pretreatment of the carbon fibers. The data in Table 2 show that the hangers prepared in Examples 13 and 14 have slightly increased impact resistance and a certain improvement in heat resistance.

[0068] Compared with Example 14, Example 15 also uses titanium dioxide, silicon dioxide, etc. to pretreat the basalt fiber. It can be seen that the impact strength and tensile strength of the hanger prepared in Example 15 are slightly increased, and the resistance to ultraviolet aging and thermal oxidation is enhanced.

[0069] Compared with Example 15, Example 16 does not add agarose to the titanium dioxide precursor solution. Compared with Example 15, Example 17 does not add water glass to the titanium dioxide precursor solution. As can be seen from the data in Table 2, the thermal oxidation capacity of the plastic hangers prepared in Example 16 and Example 17 is slightly reduced, and the UV aging resistance effect is weakened.

[0070] Compared with Example 15, Example 18 only uses silica sol and the like to pretreat the basalt fiber, while Example 19 only uses titanium dioxide precursor solution to pretreat the basalt fiber. The data in Table 2 show that compared with the data in Example 15, the plastic hanger prepared in Example 18 has better resistance to thermal oxidation, but weakened resistance to ultraviolet aging. In Example 19, the resistance to ultraviolet aging does not change much, but the heat aging resistance decreases.

[0071] Compared with Example 1, Comparative Example 1 uses antioxidant 1010 instead of UV absorber 234, light stabilizer 770 and UV absorber UVP-327, that is, the antioxidant comprises antioxidant 1076, antioxidant 168 and antioxidant 1010 in a mass ratio of 2.5:2.5:5.5. It can be seen from Table 2 that the impact strength and tensile resistance of the plastic hanger prepared in Comparative Example 1 do not change significantly, but after thermal aging and UV aging, the impact strength and elongation at break decrease significantly, especially UV aging causes the mechanical strength of the sample strip to decrease significantly.

[0072] In Comparative Example 2, equal amounts of UV absorbers were used to replace antioxidant 1076 and antioxidant 168, that is, the anti-aging agent contained UV absorber 234, light stabilizer 770 and UV absorber UVP-327 in a mass ratio of 8:1.5:1. The UV aging resistance of the plastic hanger was slightly reduced, and the heat aging resistance was significantly reduced.

[0073] In Comparative Example 3, no ultraviolet absorber UVP-327 was added to the anti-aging agent, and it can be seen that the anti-ultraviolet aging ability of the hanger material was slightly reduced.

[0074] The anti-aging agent in Comparative Example 4 contains antioxidant 1076 and ultraviolet absorber 324, and the anti-aging agent in Comparative Example 5 contains 168 and ultraviolet absorber 770. It can be seen that the hangers prepared in Comparative Example 4 and Comparative Example 5 have significantly reduced resistance to heat aging and ultraviolet aging.

[0075] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An aging-resistant plastic hanger, characterized in that: The invention comprises the following raw materials in parts by weight: 60-80 parts of polystyrene resin, 10-20 parts of PETG, 10-20 parts of polycarbonate, 12-15 parts of SEBS, 5-8 parts of compatibilizer, 5-10 parts of anti-aging agent, 20-30 parts of filler, 1-4 parts of lubricant, 1-4 parts of dispersant, and 5-10 parts of anti-aging fiber; The anti-aging agent includes antioxidant 1076, antioxidant 168, ultraviolet absorber 234, light stabilizer 770 and ultraviolet absorber UVP-327 in a mass ratio of 1-2.5:1-2.5:2.5-3:1-1.5:1-2.

2. The aging-resistant plastic hanger according to claim 1, characterized in that: The compatibilizer comprises an epoxy reactive compatibilizer, ABS and maleic anhydride grafted SEBS in a mass ratio of 1:0.2-0.4:0.6-1.

3. The aging-resistant plastic hanger according to claim 1, characterized in that: The anti-aging fibers include basalt fibers and carbon fibers in a mass ratio of 1:1-2.

4. The aging-resistant plastic hanger according to claim 3, characterized in that: The carbon fibers are pretreated as follows: After uniformly mixing carbon fiber and desulfurized waste rubber powder, hot pressing at 170-180°C and 13-15 MPa for 8-10 minutes to prepare fiber sheets, the mass ratio of carbon fiber to desulfurized waste rubber powder is 7:2-2.8; The fiber sheet is immersed in a dopamine hydrochloride solution, and a Tris buffer is added to adjust the pH to 8.

5. After immersing for 20-24 hours, the fiber sheet is filtered, washed, vacuum-dried, and crushed.

5. The aging-resistant plastic hanger according to claim 4, characterized in that: After the carbon fiber and desulfurized waste rubber powder are evenly mixed, fluorinated silicon dioxide nanoparticles are added, mixed evenly, hot pressed at 170-180° C. and 13-15 MPa for 8-10 minutes, and crushed. The mass ratio of the carbon fiber to the fluorinated silicon dioxide nanoparticles is 7:0.2-1.

6. The aging-resistant plastic hanger according to claim 4, characterized in that: The desulfurization method of the waste rubber powder is at least one of microwave treatment, desulfurization agent treatment and microwave-assisted desulfurization agent.

7. The aging-resistant plastic hanger according to claim 4, characterized in that: The basalt fiber is pretreated as follows: The basalt fiber is treated with acid, immersed in a titanium dioxide precursor solution, subjected to microwave reaction at 200-220°C for 20-30 minutes, cooled, filtered, washed, dried, and calcined at 450-480°C for 40-60 minutes to obtain a composite fiber; The silica sol is dissolved in distilled water, and the composite fiber is added thereto. The mixture is uniformly mixed and then subjected to gel treatment. The mixture is freeze-dried and then immersed in an ethanol solution of trimethylchlorosilane, and then washed and dried.

8. The aging-resistant plastic hanger according to claim 7, characterized in that: The titanium dioxide precursor solution comprises the following raw materials in parts by weight: 2.4-2.5 parts of titanium sulfate, 3.7-4 parts of disodium ethylenediaminetetraacetate, 1.4-1.6 parts of urea, 0.5-1 part of agarose, 1.2-1.5 parts of water glass, and 150-180 parts of deionized water.

9. The aging-resistant plastic hanger according to claim 1, characterized in that: The filler is selected from at least one of calcium carbonate, titanium dioxide, silicon dioxide, bentonite, talc and attapulgite; The dispersant is selected from at least one of stearic acid, paraffin oil, and white oil; The lubricant is selected from at least one of calcium stearate, dioctyl phthalate, zinc stearate, ethylene bisstearamide and polyethylene wax.

10. The method for preparing the aging-resistant plastic hanger according to any one of claims 1 to 9, characterized in that: The following steps are involved: The polystyrene and polycarbonate are dried separately and then mixed with PETG and SEBS, and an anti-aging agent, a compatibilizer, a filler, a lubricant, a dispersant and an anti-aging fiber are added, mixed evenly, extruded and granulated to prepare a blend; The blend is injected into a mold, cooled, demolded, and subjected to surface treatment to produce an aging-resistant plastic hanger.

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