Preparation method of plastic-dipped hollow pipe clothes hanger with excellent durability and skid resistance

Abstract

The invention discloses a preparation method of a plastic-dipped hollow pipe clothes hanger with excellent durability and skid resistance, and relates to the technical field of articles of daily use. Comprising a basic protective layer and a surface anti-skid layer. The plastic dipping liquid is reasonable in formula and contains PVC resin, a plasticizer, a stabilizer, filler and the like, and by combining an optimized plastic dipping process, the clothes hanger has high adhesive force, high friction coefficient and good corrosion resistance and durability. The clothes hanger is simple in structure and suitable for automatic batch production, the service life is remarkably prolonged, and user experience is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of daily necessities technology, and in particular to a method for preparing a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties. Background Technology

[0002] As an indispensable household item, the material and surface treatment of clothes hangers significantly impact their functionality, durability, and user experience. Metal hangers are widely used due to their stable structure, strong load-bearing capacity, and low cost. However, bare metal hangers are prone to rusting in humid environments, have a rough surface, and the low coefficient of friction on smooth metal surfaces can easily cause clothing to slip off. To address these issues, dip coating technology has been widely adopted in hanger production.

[0003] Traditional dip-coated clothes hangers typically involve coating a metal frame with thermoplastic powder (such as PE powder) and then heating and curing it to form a protective layer. This structure can prevent metal oxidation and corrosion to some extent, but because it only has a single layer of powder coverage, its wear resistance, adhesion, and anti-slip properties are poor. As described in some published technologies, while a single-layer PE coating is simple, it is difficult to provide ideal anti-slip functionality.

[0004] Existing patents (e.g., CN101606815A) report the use of two layers of plastic powder with different properties to coat the hanger frame, thereby improving adhesion and corrosion resistance. However, this design still relies entirely on powder coating and lacks a liquid dip coating, thus its anti-slip performance remains limited. This type of hanger still faces risks such as delamination at the metal-powder interface and powder cracking.

[0005] To balance corrosion resistance and slip resistance, utility model patent CN205197676U proposes a dip-coated clothes hanger with anti-slip function. Its basic frame is metal, first coated with a layer of PE dip-coating powder, and then coated with a liquid dip-coating solution. This design overcomes the shortcomings of traditional single-layer hangers, such as easy rusting and lack of slip resistance. Although this patent provides an effective structure, its disclosure is generally quite basic, lacking detailed or highly optimized disclosure of the dip-coating solution formula and dip-coating process parameters, leaving room for further improvement.

[0006] In actual industrial production, dip-coated hangers still face challenges related to equipment efficiency, hanging mechanisms, and automation. A utility model patent (CN 212443037U) reports a dip-coated hanger manufacturing device. This device uses a telescopic cylinder and support rod to achieve hook suspension and angle adjustment, and can rotate around the hook's central axis, thus adapting to the automated dip-coating process. However, such equipment typically focuses on structural mechanization, while systematic optimization of coating quality is still insufficient.

[0007] In addition, there are also patents for hangers based on thermoplastic elastomers or thermoplastic polyurethanes in terms of anti-slip design. For example, US Patent 8720750B2 discloses a wire hanger in which a portion of the hanger is covered with a thermoplastic elastomer (or polyurethane) material to provide higher friction and anti-slip properties. Although elastomer coatings have good feel and anti-slip properties, their durability and aging resistance may not be as stable as those of more rigid PVC dip coatings; moreover, their processing costs and equipment requirements are also higher.

[0008] In summary, although patents / technologies for various structures and devices have been disclosed, there is still considerable room for improvement in coating formulations, process details, interlayer adhesion, and long-term durability. Summary of the Invention

[0009] Based on the problems raised in the background art, the present invention proposes a method for preparing a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties.

[0010] The technical solution is as follows: A method for preparing a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties, characterized by comprising the following steps: Pretreatment: Degrease the hollow metal tubes with an alkaline cleaning agent, then phosphate them, wash and dry them; Preheating: Heat the pretreated empty tube to a temperature range of 180–250°C and hold at this temperature for 2–5 minutes to make the surface temperature of the empty tube uniform; Basic powder coating: The preheated empty tube is coated with powder to make the thermoplastic powder adhere evenly to the tube surface. The amount of powder is such that the final base layer thickness reaches 0.1–0.5 mm. Base layer curing: The powder-coated skeleton is placed in a curing oven and baked at 160–220°C for 8–20 minutes; Preparation of the dip coating solution: Heat the dip coating solution in a water bath in a mixing tank at a temperature of 50–80°C, and simultaneously apply a vacuum of 50–200 mbar. Stir for 20–60 minutes to remove air bubbles and ensure that the components are fully dispersed and dissolved. Reheat: Reheat the cured skeleton to 180–250°C and hold for 1–3 minutes to reach a suitable surface temperature to promote the adhesion of the dip coating; Immersion: The heated skeleton is slowly immersed in the plasticizing solution in a vertical or near-vertical manner for 5–30 seconds, with an immersion and lifting speed of 5–30 mm / s to control the liquid layer thickness and air bubble entrainment. Lifting and dripping: After lifting, maintain the hanging state for 3–20 seconds to allow excess liquid to drip and reduce dripping; Curing: Send the hung empty pipe into the curing oven and keep it at 160–220°C for 8–30 minutes to allow the dip-coated layer to melt, cross-link and set. Cooling: After curing, slowly cool the hanger to room temperature by natural cooling or air cooling.

[0011] Furthermore, the alkaline cleaning agent is selected from a sodium hydroxide solution with a concentration of 5–10 wt%.

[0012] Furthermore, the phosphating involves immersing a hollow metal tube in a phosphoric acid solution at a pH of 2.5–3.5 and a temperature of 25–40°C for 10–20 minutes.

[0013] Furthermore, the thermoplastic powder is selected from PE or PVC powder.

[0014] Furthermore, the dip coating solution formulation includes the following components, in parts by weight: PVC resin: 40.0–49.5 parts; Plasticizer: 21.0–26.0 parts; Heat stabilizer, calcium-zinc stabilizer: 0.5–1.0 parts; Defoamer, silicone-based defoamer BYK-3105: 3.0–3.5 parts; Modified inorganic filler: 25.0–29.0 parts; Lubricant: 0.25–0.75 parts; UV absorber: 0–1.0 parts.

[0015] Furthermore, the plasticizer is selected from dioctyl phthalate or diisooctyl phthalate.

[0016] Furthermore, the preparation method of the modified inorganic filler is as follows: according to the weight fraction, 2-5 parts of epoxy silane coupling agent KH-560 and 40-80 parts of anhydrous ethanol are added to a container, and then 0.1-0.5 parts of 1,1'-diaminoferrocene (CAS: 41636-79-7), 0.5-2 parts of triethylamine, and 0.4-0.9 parts of N-(3-aminopropyl)diethanolamine are added. The mixture is stirred and reacted at 60-70°C for 40-100 minutes to undergo an epoxy-amino ring-opening reaction. The anhydrous ethanol is removed by distillation to obtain the composite modifier. Add 100-150 parts of the pretreated inorganic filler to a high-speed mixer, start stirring at 800-1000 r / min, and slowly add the above-mentioned composite modifier. After the addition is complete, continue stirring for 30-40 minutes. After the reaction is complete, the modified inorganic filler is obtained.

[0017] Furthermore, the lubricant is a composite lubricant, comprising an internal lubricant and an external lubricant, with a weight ratio of 1:1 to 1:3 between the internal and external lubricants; the internal lubricant is selected from stearic acid or butyl stearate, and the external lubricant is selected from PE wax or montan wax.

[0018] Furthermore, the ultraviolet absorber is UV-531 or UV-327.

[0019] Furthermore, the inorganic filler may be selected from at least one of talc, calcium carbonate, silica, and kaolin.

[0020] Compared with the prior art, the present invention has the following advantages: Significantly improved durability and corrosion resistance: Phosphating treatment and base powder layer form a double protective barrier, effectively isolating external corrosive media from contact with the metal substrate; inorganic fillers modified by composite modifiers work synergistically with PVC resin to enhance the density of the coating structure, and combined with the anti-aging function of calcium-zinc stabilizers, significantly reducing the risk of coating cracking and peeling, and extending the product's service life. Optimized anti-slip performance: In the surface dip coating, modified inorganic fillers are uniformly dispersed to form a micro-nano-level rough structure. Combined with the flexible matrix of PVC resin, this significantly enhances the contact friction effect between the coating and clothing, effectively preventing clothing from slipping and improving the user experience. Excellent production and product stability: The synergistic effect of composite lubricants and silicone-based defoamers in the dip coating solution formulation, combined with vacuum stirring and precise temperature control. Detailed Implementation

[0021] The specific content of the present invention will be further explained in detail below with reference to the embodiments.

[0022] Example 1: Preparation of a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties 1. Experimental Materials (1) Core raw materials Hollow metal tube (clothes hanger frame) Alkaline cleaning agent (5wt% sodium hydroxide solution) Phosphoric acid solution (pH=2.5) Thermoplastic powder (PE powder) Raw materials for the dip coating solution: 40.0 kg PVC resin, 21.0 kg plasticizer (dioctyl phthalate), 0.5 kg calcium-zinc stabilizer, 3.0 kg silicone-based defoamer BYK-3105, 25.0 kg modified inorganic filler, and 0.25 kg composite lubricant (internal lubricant: stearic acid 0.125 kg; external lubricant: PE wax 0.125 kg). Raw materials for preparing modified inorganic fillers: 2 kg of epoxy silane coupling agent KH-560, 40 kg of anhydrous ethanol, 0.1 kg of 1,1'-diaminoferrocene (CAS: 41636-79-7), 0.5 kg of triethylamine, 0.4 kg of N-(3-aminopropyl)diethanolamine, and 100 kg of inorganic filler (calcium carbonate). (2) Equipment and Consumables Degreasing tank, phosphating tank, drying equipment, preheating oven, powder coating equipment, curing oven, mixing tank (with water bath heating and vacuum system), dip coating tank, lifting device, cooling rack 2. Experimental Procedure (1) Preparation of modified inorganic fillers According to the mass ratio, add 2 kg of epoxy silane coupling agent KH-560 and 40 kg of anhydrous ethanol to a container, then add 0.1 kg of 1,1'-diaminoferrocene, 0.5 kg of triethylamine and 0.4 kg of N-(3-aminopropyl)diethanolamine, heat to 60°C, stir and react for 40 minutes to cause the epoxy-amino ring-opening reaction. Anhydrous ethanol was removed from the system by vacuum distillation to obtain the composite modifier; Add 100 kg of inorganic filler (calcium carbonate) to a high-speed mixer, turn on the stirring (800 r / min), slowly add the above composite modifier, and continue stirring for 30 minutes after the addition is complete. After the reaction is complete, the modified inorganic filler is obtained.

[0023] (2) Preparation of dip coating solution (step 5) 40.0 kg of PVC resin, 21.0 kg of dioctyl phthalate, 0.5 kg of calcium-zinc stabilizer, 3.0 kg of silicone-based defoamer BYK-3105, 25.0 kg of the modified inorganic filler prepared above, and 0.25 kg of composite lubricant (0.125 kg of stearic acid + 0.125 kg of PE wax) were sequentially added to the mixing tank; Turn on the water bath to heat to 50°C, and at the same time start the vacuum system to make the vacuum degree inside the tank reach 50mbar. Keep stirring for 20 minutes to remove air bubbles and fully disperse and dissolve the components to obtain a uniform dip coating solution.

[0024] (3) Pre-processing (step 1) Immerse the hollow metal tube in a 5wt% sodium hydroxide solution to degrease it until the surface is free of oil. After removal, transfer to a phosphoric acid solution with pH=2.5, control the temperature at 25℃, and process for 10 minutes to complete phosphating; Rinse thoroughly with deionized water and dry in a drying device until the surface is free of watermarks.

[0025] (4) Preheating (Step 2) The pretreated metal hollow tube is placed in a preheating furnace and heated to 180°C for 2 minutes to ensure uniform surface temperature of the hollow tube.

[0026] (5) Basic powder coating (step 3) The preheated empty pipe is fed into the powder coating equipment, and PE powder is evenly adhered to the pipe surface by electrostatic spraying. The amount of powder adhered is controlled to ensure that the final base layer thickness reaches 0.1mm.

[0027] (6) Base layer curing (step 4) The powder-coated skeleton is placed in a curing oven, the temperature is set to 160℃, and it is baked and cured for 8 minutes to completely melt and solidify the base powder layer.

[0028] (7) Preheat again (step 6) The cured skeleton is placed back into the preheating oven and heated to 180°C for 1 minute to bring the surface to the temperature required for the coating to adhere.

[0029] (8) Soaking (Step 7) The heated skeleton is slowly immersed vertically into the prepared dip solution, with the immersion time controlled at 5 seconds and the immersion and lifting speed at 5 mm / s to avoid air bubbles being trapped.

[0030] (9) Lifting and dripping (step 8) After lifting the skeleton out of the dip coating solution, keep it hanging for 3 seconds to allow excess dip coating solution to drip naturally, reducing drip marks.

[0031] (10) Curing (Step 9) The suspended empty tube is sent into the curing oven, the temperature is set to 160℃, and it is kept at this temperature for 8 minutes to allow the dip-coated layer to melt, cross-link, and set.

[0032] (11) Cooling (Step 10) After curing, the hanger is transferred to a cooling rack and allowed to cool naturally to room temperature to obtain a dip-coated hollow tube hanger.

[0033] Example 2: Preparation of a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties 1. Experimental Materials (1) Core raw materials Hollow metal tube (clothes hanger frame) Alkaline cleaning agent (7wt% sodium hydroxide solution) Phosphoric acid solution (pH=3.0) Thermoplastic powder (PVC powder) Raw materials for the dip coating solution: PVC resin 43.0 kg, plasticizer (diisooctyl phthalate) 23.0 kg, calcium-zinc stabilizer 0.7 kg, silicone-based defoamer BYK-3105 3.2 kg, modified inorganic filler 26.0 kg, composite lubricant 0.4 kg (internal lubricant: butyl stearate 0.133 kg; external lubricant: montmorillonite wax 0.267 kg), ultraviolet absorber (UV-531) 0.3 kg. Raw materials for preparing modified inorganic fillers: 3 kg of epoxy silane coupling agent KH-560, 50 kg of anhydrous ethanol, 0.2 kg of 1,1'-diaminoferrocene, 1.0 kg of triethylamine, 0.6 kg of N-(3-aminopropyl)diethanolamine, and 120 kg of inorganic filler (talc). (2) Equipment and Consumables Degreasing tank, phosphating tank, drying equipment, preheating oven, powder coating equipment, curing oven, mixing tank (with water bath heating and vacuum system), dip coating tank, lifting device, cooling rack 2. Experimental Procedure (1) Preparation of modified inorganic fillers According to the mass ratio, add 3 kg of epoxy silane coupling agent KH-560 and 50 kg of anhydrous ethanol to a container, then add 0.2 kg of 1,1'-diaminoferrocene, 1.0 kg of triethylamine and 0.6 kg of N-(3-aminopropyl)diethanolamine, heat to 63°C, stir and react for 60 minutes to cause the epoxy-amino ring-opening reaction. Anhydrous ethanol was removed from the system by vacuum distillation to obtain the composite modifier; Add 120 kg of inorganic filler (talc) to a high-speed mixer, start stirring (850 r / min), slowly add the above composite modifier, and continue stirring for 35 minutes after the addition is complete. After the reaction is complete, the modified inorganic filler is obtained.

[0034] (2) Preparation of dip coating solution (step 5) 43.0 kg of PVC resin, 23.0 kg of diisooctyl phthalate, 0.7 kg of calcium-zinc stabilizer, 3.2 kg of silicone-based defoamer BYK-3105, 26.0 kg of the modified inorganic filler prepared above, 0.4 kg of composite lubricant (0.133 kg of butyl stearate + 0.267 kg of montmorillonite wax), and 0.3 kg of UV-531 were sequentially added to the mixing tank; Turn on the water bath to heat to 60°C, and at the same time start the vacuum system to make the vacuum degree inside the tank reach 100mbar. Keep stirring for 30 minutes to remove air bubbles and fully disperse and dissolve the components to obtain a uniform dip coating solution.

[0035] (3) Pre-processing (step 1) Immerse the hollow metal tube in a 7wt% sodium hydroxide solution to degrease it until the surface is free of oil. After removal, transfer to a phosphoric acid solution with pH=3.0, control the temperature at 30℃, and process for 15 minutes to complete phosphating; Rinse thoroughly with deionized water and dry in a drying device until the surface is free of watermarks.

[0036] (4) Preheating (Step 2) The pretreated hollow metal tube is placed in a preheating furnace and heated to 200°C. The temperature is maintained for 3 minutes to ensure uniform surface temperature of the tube.

[0037] (5) Basic powder coating (step 3) The preheated empty pipe is fed into the powder coating equipment, and the fluidized bed coating method is used to make PVC powder adhere evenly to the pipe surface. The amount of powder adhered is controlled to ensure that the final base layer thickness reaches 0.25mm.

[0038] (6) Base layer curing (step 4) The powder-coated skeleton is placed in a curing oven, the temperature is set to 180℃, and it is baked and cured for 12 minutes to completely melt and solidify the base powder layer.

[0039] (7) Preheat again (step 6) The cured skeleton is placed back into the preheating oven and heated to 200°C for 2 minutes to bring the surface to the temperature required for the coating to adhere.

[0040] (8) Soaking (Step 7) The heated skeleton is slowly immersed in the prepared dip solution in a near-vertical manner, with the immersion time controlled at 15 seconds and the immersion and lifting speed at 15 mm / s to avoid air bubbles being trapped.

[0041] (9) Lifting and dripping (step 8) After lifting the skeleton out of the dip coating solution, keep it hanging for 10 seconds to allow excess dip coating solution to drip naturally, reducing drip marks.

[0042] (10) Curing (Step 9) The suspended empty tube is sent into a curing oven, the temperature is set to 180℃, and it is kept at that temperature for 15 minutes to allow the dip-coated layer to melt, cross-link, and set.

[0043] (11) Cooling (Step 10) After curing, the hanger is transferred to a cooling rack and allowed to cool naturally to room temperature to obtain a dip-coated hollow tube hanger.

[0044] Example 3: Preparation of a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties 1. Experimental Materials (1) Core raw materials Hollow metal tube (clothes hanger frame) Alkaline cleaning agent (8wt% sodium hydroxide solution) Phosphoric acid solution (pH=3.3) Thermoplastic powder (PE powder) Raw materials for the dip coating solution: PVC resin 47.0 kg, plasticizer (dioctyl phthalate) 25.0 kg, calcium-zinc stabilizer 0.9 kg, silicone-based defoamer BYK-3105 3.4 kg, modified inorganic filler 28.0 kg, composite lubricant 0.6 kg (internal lubricant: stearic acid 0.171 kg; external lubricant: PE wax 0.429 kg), ultraviolet absorber (UV-327) 0.8 kg. Raw materials for preparing modified inorganic fillers: 4 kg of epoxy silane coupling agent KH-560, 70 kg of anhydrous ethanol, 0.4 kg of 1,1'-diaminoferrocene, 1.5 kg of triethylamine, 0.8 kg of N-(3-aminopropyl)diethanolamine, and 140 kg of inorganic filler (kaolin). (2) Equipment and Consumables Degreasing tank, phosphating tank, drying equipment, preheating oven, powder coating equipment, curing oven, mixing tank (with water bath heating and vacuum system), dip coating tank, lifting device, air cooling equipment 2. Experimental Procedure (1) Preparation of modified inorganic fillers According to the mass ratio, 4 kg of epoxy silane coupling agent KH-560 and 70 kg of anhydrous ethanol were added to a container, followed by 0.4 kg of 1,1'-diaminoferrocene, 1.5 kg of triethylamine, and 0.8 kg of N-(3-aminopropyl)diethanolamine. The mixture was heated to 67°C and stirred for 80 minutes to induce an epoxy-amino ring-opening reaction. Anhydrous ethanol was removed from the system by vacuum distillation to obtain the composite modifier; Add 140 kg of inorganic filler (kaolin) to a high-speed mixer, start stirring (950 r / min), slowly add the above-mentioned composite modifier, and continue stirring for 38 minutes after the addition is complete. After the reaction is complete, the modified inorganic filler is obtained.

[0045] (2) Preparation of dip coating solution (step 5) 47.0 kg of PVC resin, 25.0 kg of dioctyl phthalate, 0.9 kg of calcium-zinc stabilizer, 3.4 kg of silicone-based defoamer BYK-3105, 28.0 kg of the modified inorganic filler prepared above, 0.6 kg of composite lubricant (0.171 kg of stearic acid + 0.429 kg of PE wax), and 0.8 kg of UV-327 were sequentially added to the mixing tank. Turn on the water bath to heat to 70°C, and at the same time start the vacuum system to make the vacuum degree inside the tank reach 150mbar. Keep stirring for 45 minutes to remove air bubbles and fully disperse and dissolve the components to obtain a uniform dip coating solution.

[0046] (3) Pre-processing (step 1) Immerse the hollow metal tube in an 8wt% sodium hydroxide solution to degrease it until the surface is free of oil. After removal, it is transferred to a phosphoric acid solution with pH=3.3, and the temperature is controlled at 35℃ for 18 minutes to complete phosphating; Rinse thoroughly with deionized water and dry in a drying device until the surface is free of watermarks.

[0047] (4) Preheating (Step 2) The pretreated metal hollow tube is placed in a preheating furnace and heated to 230°C for 4 minutes to ensure uniform surface temperature of the hollow tube.

[0048] (5) Basic powder coating (step 3) The preheated empty pipe is fed into the powder coating equipment, and PE powder is evenly adhered to the pipe surface by electrostatic spraying. The amount of powder adhered is controlled to ensure that the final base layer thickness reaches 0.4mm.

[0049] (6) Base layer curing (step 4) The powder-coated skeleton is placed in a curing oven, the temperature is set to 200℃, and it is baked and cured for 16 minutes to completely melt and solidify the base powder layer.

[0050] (7) Preheat again (step 6) The cured skeleton is placed back into the preheating oven and heated to 230°C for 2.5 minutes to allow the surface to reach the temperature required for the coating to adhere.

[0051] (8) Soaking (Step 7) The heated skeleton is slowly immersed vertically into the prepared dip solution, with the immersion time controlled at 25 seconds and the immersion and lifting speed at 25 mm / s to avoid air bubbles being trapped.

[0052] (9) Lifting and dripping (step 8) After lifting the skeleton out of the dip coating solution, keep it hanging for 15 seconds to allow excess dip coating solution to drip naturally, reducing drip marks.

[0053] (10) Curing (Step 9) The empty tube after hanging is sent into the curing oven, the temperature is set to 200℃, and it is kept at the temperature for 25 minutes to allow the dip-coated layer to melt, cross-link and set.

[0054] (11) Cooling (Step 10) After curing, the hanger is transferred to a cooling device and cooled to room temperature to obtain a plastic-coated hollow tube hanger.

[0055] Example 4: Preparation of a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties 1. Experimental Materials (1) Core raw materials Hollow metal tube (clothes hanger frame) Alkaline cleaning agent (10wt% sodium hydroxide solution) Phosphoric acid solution (pH=3.5) Thermoplastic powder (PVC powder) Raw materials for the dip coating solution: PVC resin 49.5kg, plasticizer (diisooctyl phthalate) 26.0kg, calcium-zinc stabilizer 1.0kg, silicone-based defoamer BYK-3105 3.5kg, modified inorganic filler 29.0kg, composite lubricant 0.75kg (internal lubricant: butyl stearate 0.1875kg; external lubricant: montmorillonite wax 0.5625kg), ultraviolet absorber (UV-327) 1.0kg. Raw materials for preparing modified inorganic fillers: 5 kg of epoxy silane coupling agent KH-560, 80 kg of anhydrous ethanol, 0.5 kg of 1,1'-diaminoferrocene, 2.0 kg of triethylamine, 0.9 kg of N-(3-aminopropyl)diethanolamine, and 150 kg of inorganic filler (silica). (2) Equipment and Consumables Degreasing tank, phosphating tank, drying equipment, preheating oven, powder coating equipment, curing oven, mixing tank (with water bath heating and vacuum system), dip coating tank, lifting device, air cooling equipment 2. Experimental Procedure (1) Preparation of modified inorganic fillers According to the mass ratio, add 5 kg of epoxy silane coupling agent KH-560 and 80 kg of anhydrous ethanol to a container, then add 0.5 kg of 1,1'-diaminoferrocene, 2.0 kg of triethylamine and 0.9 kg of N-(3-aminopropyl)diethanolamine, heat to 70°C, stir and react for 100 minutes to cause the epoxy-amino ring-opening reaction. Anhydrous ethanol was removed from the system by vacuum distillation to obtain the composite modifier; Add 150 kg of inorganic filler (silica) to a high-speed mixer, turn on the stirring (1000 r / min), slowly add the above composite modifier, and continue stirring for 40 minutes after the addition is complete. After the reaction is complete, the modified inorganic filler is obtained.

[0056] (2) Preparation of dip coating solution (step 5) 49.5 kg of PVC resin, 26.0 kg of diisooctyl phthalate, 1.0 kg of calcium-zinc stabilizer, 3.5 kg of silicone-based defoamer BYK-3105, 29.0 kg of the modified inorganic filler prepared above, 0.75 kg of composite lubricant (0.1875 kg of butyl stearate + 0.5625 kg of montmorillonite wax), and 1.0 kg of UV-327 were sequentially added to the mixing tank. Turn on the water bath and heat to 80°C. At the same time, start the vacuum system to make the vacuum degree inside the tank reach 200mbar. Keep stirring for 60 minutes to remove air bubbles and fully disperse and dissolve the components to obtain a uniform dip coating solution.

[0057] (3) Pre-processing (step 1) Immerse the hollow metal tube in a 10wt% sodium hydroxide solution to degrease it until the surface is free of oil. After removal, it is transferred to a phosphoric acid solution with pH=3.5, and the temperature is controlled at 40℃ for 20 minutes to complete the phosphating. Rinse thoroughly with deionized water and dry in a drying device until the surface is free of watermarks.

[0058] (4) Preheating (Step 2) The pretreated metal hollow tube is placed in a preheating furnace and heated to 250°C for 5 minutes to ensure uniform surface temperature of the hollow tube.

[0059] (5) Basic powder coating (step 3) The preheated empty pipe is fed into the powder coating equipment, and the fluidized bed coating method is used to make PVC powder adhere evenly to the pipe surface. The amount of powder adhered is controlled to ensure that the final base layer thickness reaches 0.5mm.

[0060] (6) Base layer curing (step 4) The powder-coated skeleton is placed in a curing oven, the temperature is set to 220℃, and it is baked and cured for 20 minutes to completely melt and solidify the base powder layer.

[0061] (7) Preheat again (step 6) The cured skeleton is placed back into the preheating oven and heated to 250°C for 3 minutes to bring the surface to the temperature required for the coating to adhere.

[0062] (8) Soaking (Step 7) The heated skeleton is slowly immersed in the prepared dip solution in a near-vertical manner, with the immersion time controlled at 30 seconds and the immersion and lifting speed at 30 mm / s to avoid air bubbles being trapped.

[0063] (9) Lifting and dripping (step 8) After lifting the skeleton out of the dip coating solution, keep it hanging for 20 seconds to allow excess dip coating solution to drip naturally, reducing drip marks.

[0064] (10) Curing (Step 9) The suspended empty tube is sent into a curing oven, the temperature is set to 220℃, and it is kept at that temperature for 30 minutes to allow the dip-coated layer to melt, cross-link, and set.

[0065] (11) Cooling (Step 10) After curing, the hanger is transferred to a cooling device and cooled to room temperature to obtain a plastic-coated hollow tube hanger.

[0066] Comparative Example 1: Preparation of a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties 1. Experimental Materials (1) Core raw materials Hollow metal tube (clothes hanger frame) Alkaline cleaning agent (5wt% sodium hydroxide solution) Phosphoric acid solution (pH=2.5) Thermoplastic powder (PE powder) Raw materials for the dip coating solution: 40.0 kg PVC resin, 21.0 kg plasticizer (dioctyl phthalate), 0.5 kg calcium-zinc stabilizer, 3.0 kg silicone-based defoamer BYK-3105, 25.0 kg inorganic filler nano calcium carbonate, and 0.25 kg composite lubricant (internal lubricant: stearic acid 0.125 kg; external lubricant: PE wax 0.125 kg). (2) Equipment and Consumables Degreasing tank, phosphating tank, drying equipment, preheating oven, powder coating equipment, curing oven, mixing tank (with water bath heating and vacuum system), dip coating tank, lifting device, cooling rack 2. Experimental Procedure (1) Preparation of dip coating solution (step 5) 40.0 kg of PVC resin, 21.0 kg of dioctyl phthalate, 0.5 kg of calcium-zinc stabilizer, 3.0 kg of silicone-based defoamer BYK-3105, 25.0 kg of inorganic filler nano-calcium carbonate, and 0.25 kg of composite lubricant (0.125 kg of stearic acid + 0.125 kg of PE wax) were added to the mixing tank in sequence. Turn on the water bath to heat to 50°C, and at the same time start the vacuum system to make the vacuum degree inside the tank reach 50mbar. Keep stirring for 20 minutes to remove air bubbles and fully disperse and dissolve the components to obtain a uniform dip coating solution.

[0067] (3) Pre-processing (step 1) Immerse the hollow metal tube in a 5wt% sodium hydroxide solution to degrease it until the surface is free of oil. After removal, transfer to a phosphoric acid solution with pH=2.5, control the temperature at 25℃, and process for 10 minutes to complete phosphating; Rinse thoroughly with deionized water and dry in a drying device until the surface is free of watermarks.

[0068] (4) Preheating (Step 2) The pretreated metal hollow tube is placed in a preheating furnace and heated to 180°C for 2 minutes to ensure uniform surface temperature of the hollow tube.

[0069] (5) Basic powder coating (step 3) The preheated empty pipe is fed into the powder coating equipment, and PE powder is evenly adhered to the pipe surface by electrostatic spraying. The amount of powder adhered is controlled to ensure that the final base layer thickness reaches 0.1mm.

[0070] (6) Base layer curing (step 4) The powder-coated skeleton is placed in a curing oven, the temperature is set to 160℃, and it is baked and cured for 8 minutes to completely melt and solidify the base powder layer.

[0071] (7) Preheat again (step 6) The cured skeleton is placed back into the preheating oven and heated to 180°C for 1 minute to bring the surface to the temperature required for the coating to adhere.

[0072] (8) Soaking (Step 7) The heated skeleton is slowly immersed vertically into the prepared dip solution, with the immersion time controlled at 5 seconds and the immersion and lifting speed at 5 mm / s to avoid air bubbles being trapped.

[0073] (9) Lifting and dripping (step 8) After lifting the skeleton out of the dip coating solution, keep it hanging for 3 seconds to allow excess dip coating solution to drip naturally, reducing drip marks.

[0074] (10) Curing (Step 9) The suspended empty tube is sent into the curing oven, the temperature is set to 160℃, and it is kept at this temperature for 8 minutes to allow the dip-coated layer to melt, cross-link, and set.

[0075] (11) Cooling (Step 10) After curing, the hanger is transferred to a cooling rack and allowed to cool naturally to room temperature to obtain a dip-coated hollow tube hanger.

[0076] Comparative Example 2: Preparation of a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties 1. Experimental Materials (1) Core raw materials Hollow metal tube (clothes hanger frame) Alkaline cleaning agent (5wt% sodium hydroxide solution) Phosphoric acid solution (pH=2.5) Thermoplastic powder (PE powder) Raw materials for the dip coating solution: 40.0 kg PVC resin, 21.0 kg plasticizer (dioctyl phthalate), 0.5 kg calcium-zinc stabilizer, 3.0 kg silicone-based defoamer BYK-3105, 25.0 kg modified inorganic filler, and 0.25 kg composite lubricant (internal lubricant: stearic acid 0.125 kg; external lubricant: PE wax 0.125 kg). Raw materials for preparing modified inorganic fillers: 2 kg of epoxy silane coupling agent KH-560, 40 kg of anhydrous ethanol, 0.1 kg of 1,1'-diaminoferrocene (CAS: 41636-79-7), 0.5 kg of triethylamine, and 100 kg of inorganic filler (calcium carbonate). (2) Equipment and Consumables Degreasing tank, phosphating tank, drying equipment, preheating oven, powder coating equipment, curing oven, mixing tank (with water bath heating and vacuum system), dip coating tank, lifting device, cooling rack 2. Experimental Procedure (1) Preparation of modified inorganic fillers According to the mass ratio, add 2 kg of epoxy silane coupling agent KH-560 and 40 kg of anhydrous ethanol to a container, then add 0.1 kg of 1,1'-diaminoferrocene and 0.5 kg of triethylamine, heat to 60°C, stir and react for 40 minutes to cause the epoxy-amino ring-opening reaction. Anhydrous ethanol was removed from the system by vacuum distillation to obtain the composite modifier; Add 100 kg of inorganic filler (calcium carbonate) to a high-speed mixer, turn on the stirring (800 r / min), slowly add the above composite modifier, and continue stirring for 30 minutes after the addition is complete. After the reaction is complete, the modified inorganic filler is obtained.

[0077] (2) Preparation of dip coating solution (step 5) 40.0 kg of PVC resin, 21.0 kg of dioctyl phthalate, 0.5 kg of calcium-zinc stabilizer, 3.0 kg of silicone-based defoamer BYK-3105, 25.0 kg of the modified inorganic filler prepared above, and 0.25 kg of composite lubricant (0.125 kg of stearic acid + 0.125 kg of PE wax) were sequentially added to the mixing tank; Turn on the water bath to heat to 50°C, and at the same time start the vacuum system to make the vacuum degree inside the tank reach 50mbar. Keep stirring for 20 minutes to remove air bubbles and fully disperse and dissolve the components to obtain a uniform dip coating solution.

[0078] (3) Pre-processing (step 1) Immerse the hollow metal tube in a 5wt% sodium hydroxide solution to degrease it until the surface is free of oil. After removal, transfer to a phosphoric acid solution with pH=2.5, control the temperature at 25℃, and process for 10 minutes to complete phosphating; Rinse thoroughly with deionized water and dry in a drying device until the surface is free of watermarks.

[0079] (4) Preheating (Step 2) The pretreated metal hollow tube is placed in a preheating furnace and heated to 180°C for 2 minutes to ensure uniform surface temperature of the hollow tube.

[0080] (5) Basic powder coating (step 3) The preheated empty pipe is fed into the powder coating equipment, and PE powder is evenly adhered to the pipe surface by electrostatic spraying. The amount of powder adhered is controlled to ensure that the final base layer thickness reaches 0.1mm.

[0081] (6) Base layer curing (step 4) The powder-coated skeleton is placed in a curing oven, the temperature is set to 160℃, and it is baked and cured for 8 minutes to completely melt and solidify the base powder layer.

[0082] (7) Preheat again (step 6) The cured skeleton is placed back into the preheating oven and heated to 180°C for 1 minute to bring the surface to the temperature required for the coating to adhere.

[0083] (8) Soaking (Step 7) The heated skeleton is slowly immersed vertically into the prepared dip solution, with the immersion time controlled at 5 seconds and the immersion and lifting speed at 5 mm / s to avoid air bubbles being trapped.

[0084] (9) Lifting and dripping (step 8) After lifting the skeleton out of the dip coating solution, keep it hanging for 3 seconds to allow excess dip coating solution to drip naturally, reducing drip marks.

[0085] (10) Curing (Step 9) The suspended empty tube is sent into the curing oven, the temperature is set to 160℃, and it is kept at this temperature for 8 minutes to allow the dip-coated layer to melt, cross-link, and set.

[0086] (11) Cooling (Step 10) After curing, the hanger is transferred to a cooling rack and allowed to cool naturally to room temperature to obtain a dip-coated hollow tube hanger.

[0087] Comparative Example 3: Preparation of a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties 1. Experimental Materials (1) Core raw materials Hollow metal tube (clothes hanger frame) Alkaline cleaning agent (5wt% sodium hydroxide solution) Phosphoric acid solution (pH=2.5) Thermoplastic powder (PE powder) Raw materials for the dip coating solution: 40.0 kg PVC resin, 21.0 kg plasticizer (dioctyl phthalate), 0.5 kg calcium-zinc stabilizer, 3.0 kg silicone-based defoamer BYK-3105, 25.0 kg modified inorganic filler, and 0.25 kg composite lubricant (internal lubricant: stearic acid 0.125 kg; external lubricant: PE wax 0.125 kg). Raw materials for preparing modified inorganic fillers: 2 kg of epoxy silane coupling agent KH-560, 40 kg of anhydrous ethanol, 0.5 kg of triethylamine, 0.4 kg of N-(3-aminopropyl)diethanolamine, and 100 kg of inorganic filler (calcium carbonate). (2) Equipment and Consumables Degreasing tank, phosphating tank, drying equipment, preheating oven, powder coating equipment, curing oven, mixing tank (with water bath heating and vacuum system), dip coating tank, lifting device, cooling rack 2. Experimental Procedure (1) Preparation of modified inorganic fillers According to the mass ratio, add 2 kg of epoxy silane coupling agent KH-560 and 40 kg of anhydrous ethanol to a container, then add 0.5 kg of triethylamine and 0.4 kg of N-(3-aminopropyl)diethanolamine, heat to 60°C, stir and react for 40 minutes to cause the epoxy-amino ring-opening reaction. Anhydrous ethanol was removed from the system by vacuum distillation to obtain the composite modifier; Add 100 kg of inorganic filler (calcium carbonate) to a high-speed mixer, turn on the stirring (800 r / min), slowly add the above composite modifier, and continue stirring for 30 minutes after the addition is complete. After the reaction is complete, the modified inorganic filler is obtained.

[0088] (2) Preparation of dip coating solution (step 5) 40.0 kg of PVC resin, 21.0 kg of dioctyl phthalate, 0.5 kg of calcium-zinc stabilizer, 3.0 kg of silicone-based defoamer BYK-3105, 25.0 kg of the modified inorganic filler prepared above, and 0.25 kg of composite lubricant (0.125 kg of stearic acid + 0.125 kg of PE wax) were sequentially added to the mixing tank; Turn on the water bath to heat to 50°C, and at the same time start the vacuum system to make the vacuum degree inside the tank reach 50mbar. Keep stirring for 20 minutes to remove air bubbles and fully disperse and dissolve the components to obtain a uniform dip coating solution.

[0089] (3) Pre-processing (step 1) Immerse the hollow metal tube in a 5wt% sodium hydroxide solution to degrease it until the surface is free of oil. After removal, transfer to a phosphoric acid solution with pH=2.5, control the temperature at 25℃, and process for 10 minutes to complete phosphating; Rinse thoroughly with deionized water and dry in a drying device until the surface is free of watermarks.

[0090] (4) Preheating (Step 2) The pretreated metal hollow tube is placed in a preheating furnace and heated to 180°C for 2 minutes to ensure uniform surface temperature of the hollow tube.

[0091] (5) Basic powder coating (step 3) The preheated empty pipe is fed into the powder coating equipment, and PE powder is evenly adhered to the pipe surface by electrostatic spraying. The amount of powder adhered is controlled to ensure that the final base layer thickness reaches 0.1mm.

[0092] (6) Base layer curing (step 4) The powder-coated skeleton is placed in a curing oven, the temperature is set to 160℃, and it is baked and cured for 8 minutes to completely melt and solidify the base powder layer.

[0093] (7) Preheat again (step 6) The cured skeleton is placed back into the preheating oven and heated to 180°C for 1 minute to bring the surface to the temperature required for the coating to adhere.

[0094] (8) Soaking (Step 7) The heated skeleton is slowly immersed vertically into the prepared dip solution, with the immersion time controlled at 5 seconds and the immersion and lifting speed at 5 mm / s to avoid air bubbles being trapped.

[0095] (9) Lifting and dripping (step 8) After lifting the skeleton out of the dip coating solution, keep it hanging for 3 seconds to allow excess dip coating solution to drip naturally, reducing drip marks.

[0096] (10) Curing (Step 9) The suspended empty tube is sent into the curing oven, the temperature is set to 160℃, and it is kept at this temperature for 8 minutes to allow the dip-coated layer to melt, cross-link, and set.

[0097] (11) Cooling (Step 10) After curing, the hanger is transferred to a cooling rack and allowed to cool naturally to room temperature to obtain a dip-coated hollow tube hanger.

[0098] Test method: 1. Coating adhesion test Cross-cut experiment Procedure: Using a carbide knife, make longitudinal and transverse cuts (6×6 grid) at 1 mm intervals on the coating surface, penetrating the coating to the substrate (hollow metal tube); then apply standard transparent tape (3M tape), press for 60 seconds, and then quickly peel it off at an angle close to 180°. After peeling, observe the peeled area with a magnifying glass or microscope and assess the adhesion level (0–5).

[0099] Judgment criteria: If the cross-cut test is grade 0 (no peeling) or grade 1 (very limited peeling), it indicates that the adhesion is very good.

[0100] 2. Corrosion resistance test Method based on standard: GB / T 10125 (Neutral Salt Spray Test) Procedure: Hang the sample (clothes hanger) in a salt spray chamber (5% NaCl solution, temperature 35 °C ± 2 °C) and set the test time to 500 hours.

[0101] After the test, remove the sample, rinse it with clean water, dry it, and visually inspect or observe under a microscope for any blistering, peeling, rust (exposed metal), or other phenomena in the coating.

[0102] Evaluation criteria: If there is no obvious peeling, no rust (or only a very small amount of white rust) / substrate exposure after 500 hours of salt spray test, the corrosion resistance is considered to be excellent.

[0103] 3. Anti-slip (coefficient of friction) test The anti-slip properties of a clothes hanger are primarily assessed by the coefficient of friction when the coating comes into contact with clothing (fabric).

[0104] Static friction coefficient test method: Prepare a standard fabric (cotton or polyester) as the test garment; fix the fabric strip on the inclined plate, with one end of the plate in contact with the shoulder of the hanger, slowly raise the angle of the inclined plate, and record the maximum inclination angle (θ) when the fabric strip just begins to slide; the static friction coefficient μ_s ≈ tan(θ).

[0105] 4. Durability / Cyclic Garment Hanging Test Simulated garment hanging cycle test: Design a mechanical garment hanging cycle device (or manual / automatic method) to repeatedly hang garments (standard garments or garments of standard weight) on hangers, remove the garments, and hang them back. Set the number of cycles (5,000 times).

[0106] Inspection content: Check whether the coating of the clothes hanger is damaged (cracks, peeling), and record it using a microscope or visual inspection; Test results: Table 1 Coating adhesion rating (grading) Salt spray test (after 500 h) static friction coefficient Circular hanging of clothes (5000 times) Example 1 Grade 0 (No peeling) No obvious peeling, no rust spots 0.45 No cracks / no peeling Example 2 Grade 0 (No peeling) No obvious peeling, no rust spots 0.47 No cracks / no peeling Example 3 Grade 0 (No peeling) No obvious peeling, no rust spots 0.48 No cracks / no peeling Example 4 Grade 0 (No peeling) No obvious peeling, no rust spots 0.50 No cracks / no peeling Comparative Example 1 Grade 1 (minor spotting) Localized rust spots and cracks 0.41 Slight wear on the shoulder during circulation, with pinpoint coating peeling. Comparative Example 2 Grade 0 (No peeling) Trace amount of white rust, but no penetrating cracks. 0.43 Slight wear on the shoulder area during circulation, but no coating peeling. Comparative Example 3 Grade 0 (No peeling) No obvious peeling, no rust spots 0.44 Slight wear on the shoulder area during circulation, but no coating peeling. The test results show that the coating adhesion, corrosion resistance, anti-slip properties, and cyclic durability of the embodiment of the present invention are all superior to those of the comparative example. This is mainly due to the precise selection and synergistic effect of various additives in the formulation. The key role of the composite modifier (KH-560, 1,1'-diaminoferrocene, N-(3-aminopropyl)diethanolamine): The modified layer formed by the epoxy-amino ring-opening reaction effectively solves the compatibility problem between inorganic fillers and PVC resin, significantly improves the bonding strength between the coating and the substrate, and between the phases inside the coating, so that the example does not peel off in the cross-cut test, and does not crack or fall off after cyclic coating, while the comparative example without this composite modification system showed point-like peeling or wear; Synergistic protective effect of calcium-zinc stabilizers and UV absorbers: Calcium-zinc stabilizers inhibit the degradation of PVC resin, and together with the anti-photoaging function of optional UV absorbers (UV-531 / UV-327), the examples showed no rust spots or obvious peeling after long-term salt spray testing, while the comparative examples showed local rust spots or white rust, demonstrating the strengthening effect of this type of additive on corrosion resistance and durability. The process optimization effect of silicone-based defoamers and composite lubricants: Silicone-based defoamers fully remove air bubbles from the dip coating during vacuum stirring, preventing the formation of pores in the coating and ensuring the integrity of the anti-corrosion barrier; Composite lubricants (internal / external lubricants mixed in a specific ratio) improve the coating's processability and reduce wear during repeated use, allowing the example to maintain coating integrity even after repeated coating, while the comparative example showed different degrees of wear; Overall synergistic effect: Various additives do not act in isolation, but form a synergistic system with the main components such as PVC resin, plasticizer, and inorganic filler. Composite modifiers improve filler dispersion and interfacial bonding, stabilizers ensure resin stability, and defoamers and lubricants optimize the molding process. Ultimately, the embodiment demonstrates comprehensive advantages in adhesion, corrosion resistance, anti-slip properties, and durability, significantly outperforming the comparative embodiment that did not use this additive system or had an unreasonable formulation ratio.

[0107] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A method for preparing a dip-coated hollow tube clothes hanger with excellent durability and anti-slip properties, characterized in that, The method comprises the following steps: Pre-treatment: degreasing the metal hollow tube with an alkaline cleaner, then phosphating, washing and drying; Preheating: heating the pre-treated hollow tube to a temperature range of 180-250°C and keeping the temperature for 2-5 minutes to make the surface temperature of the hollow tube uniform; Base powder coating: powder coating the preheated hollow tube to make the thermoplastic powder adhere to the surface of the tube uniformly, and the amount of powder is such that the final base layer thickness is 0.1-0.5mm; Base layer curing: sending the powder-coated skeleton into a curing oven to bake and cure at 160-220°C for 8-20 minutes; Plastic dipping liquid preparation: heating the plastic dipping liquid in a stirring tank in a water bath at a temperature of 50-80°C, and at the same time, performing vacuuming at a vacuum degree of 50-200mbar, and stirring for 20-60 minutes to remove bubbles and make the components fully dispersed and dissolved; Re-preheating: heating the cured skeleton again to 180-250°C for 1-3 minutes to make it reach a suitable surface temperature to promote the adhesion of the plastic dipping layer; Dipping: slowly dipping the heated skeleton into the plastic dipping liquid in a vertical or near-vertical manner, and the dipping time is 5-30 seconds, and the dipping and lifting speed is 5-30mm / s to control the liquid layer thickness and bubble entrainment; Lifting and dripping: maintaining the vertical hanging state for 3-20 seconds after lifting to allow the excess liquid to flow and reduce dripping; Curing: sending the hung hollow tube into a curing oven to cure at a temperature of 160-220°C for 8-30 minutes to make the plastic dipping layer melt, crosslink and set; Cooling: after the curing is completed, slowly cooling the hanger to room temperature in a natural cooling or air cooling manner; The plastic dipping liquid formula contains modified inorganic fillers prepared by reacting epoxy silane coupling agent KH-560, 1,1'-diaminoferrocene, triethylamine, N-(3-aminopropyl)diethanolamine and inorganic fillers.

2. The method for manufacturing the plastic-impregnated hollow-tube hanger with excellent durability and slip resistance according to claim 1, characterized in that: The alkaline cleaner is selected from a sodium hydroxide solution with a concentration of 5-10wt%.

3. The method of claim 1, wherein the method of preparing the plastic coated hollow pipe hanger with excellent durability and anti-skid property is characterized by: The phosphating step is to immerse the metal hollow tube into a phosphoric acid solution with a pH of 2.5-3.5 and a temperature of 25-40°C for 10-20 minutes.

4. The method of claim 1, wherein the method of preparing the plastic coated hollow pipe hanger with excellent durability and anti-skid property is characterized by: The thermoplastic powder is selected from PE or PVC powder.

5. The method of claim 1, wherein the method of preparing the plastic coated hollow pipe hanger with excellent durability and anti-skid property is characterized by: The plastic dipping liquid formula includes the following components in mass fraction: PVC resin: 40.0-49.5 parts; Plasticizer: 21.0-26.0 parts; Thermal stabilizer, calcium-zinc stabilizer: 0.5-1.0 parts; Defoaming agent, silicon-based defoaming agent BYK-3105: 3.0-3.5 parts; Modified inorganic filler: 25.0-29.0 parts; Lubricant: 0.25-0.75 parts; Ultraviolet absorber: 0-1.0 parts.

6. The method of claim 5, wherein the method is characterized by the steps of: The plasticizer is selected from dioctyl phthalate or diisooctyl phthalate. ​ 7. The method of claim 5, wherein the method is characterized by the steps of: The preparation method of the modified inorganic filler is as follows: according to the weight fraction, 2-5 parts of epoxy silane coupling agent KH-560, 40-80 parts of anhydrous ethanol are added into a container, then 0.1-0.5 parts of 1,1'-diaminoferrocene and 0.5-2 parts of triethylamine, 0.4-0.9 parts of N-(3-aminopropyl)diethanolamine are added, and stirring reaction is carried out at 60-70 DEG C for 40-100 minutes, an epoxy-amino ring-opening reaction occurs, anhydrous ethanol is removed by distillation, and a composite modifier is obtained; ​ 100-150 parts of the pretreated inorganic filler are added into a high-speed mixer, stirring is started, the rotating speed is 800-1000 r / min, and the composite modifier is slowly added, after dropwise addition is completed, stirring is continued for 30-40 minutes, and after the reaction is completed, the modified inorganic filler is obtained.

8. The method of claim 5, wherein the plastic coated hollow pipe hanger has excellent durability and slip resistance. The lubricant is a composite lubricant, which comprises an inner lubricant and an outer lubricant, and the weight ratio of the inner lubricant to the outer lubricant is 1:1-1:3; the inner lubricant is selected from stearic acid or butyl stearate, and the outer lubricant is selected from PE wax or montan wax.

9. The method of claim 5, wherein the plastic coated hollow pipe hanger has excellent durability and slip resistance. The ultraviolet absorber is UV-531 or UV-327.

10. The method of claim 7, wherein the method is characterized by excellent durability and slip resistance. The inorganic filler can be selected from at least one of talc, calcium carbonate, silicon dioxide and kaolin.