Super-hydrophobic self-cleaning PVC-U condensate pipe for air conditioner and preparation method of super-hydrophobic self-cleaning PVC-U condensate pipe

Abstract

The invention relates to the field of air conditioner condensate pipes, in particular to a super-hydrophobic self-cleaning PVC-U condensate pipe for an air conditioner and a preparation method of the super-hydrophobic self-cleaning PVC-U condensate pipe, and aims at solving the problems that an existing PVC-U condensate pipe does not have a super-hydrophobic self-cleaning function or is poor in self-cleaning function, and pipeline blockage and pipeline water leakage can be caused in the long-term use process. According to the preparation method, polyvinyl chloride resin is taken as a main raw material, hydrophobic titanium dioxide particles and a hydrophobic reinforcing agent are added into the polyvinyl chloride resin to realize a super-hydrophobic surface design and a self-cleaning function, so that dust, impurities and scale cannot be attached to the pipe wall of the condensate pipe, the smoothness of the condensate pipe can be kept, and the condensate pipe is effectively prevented from being blocked; corrosion and damage of the condensate pipe can be reduced, and the service life of the condensate pipe is prolonged; and the PVC-U condensate pipe is simple in preparation method and can be produced on a large scale, the operation cost is reduced, the service life of the pipe is prolonged, and the efficiency of the pipe is improved.

Description

Technical Field

[0001] The invention relates to the field of air-conditioning condensation water pipes, and in particular to a super-hydrophobic self-cleaning PVC-U condensation water pipe for an air-conditioner and a preparation method thereof. Background Art

[0002] As one of the most common building furniture, the air conditioner is widely used. The air conditioner needs to connect the indoor unit and the outdoor unit through the condensate pipe to achieve the function of cooling or heating. The condensate pipe can discharge the condensate generated when the air conditioner is in operation in time to avoid water accumulation and leakage in the air conditioner. It is the key pipeline for the normal operation of the air conditioning system. In order to make the air conditioner operate normally, the pipeline needs to have good sealing, pressure resistance and corrosion resistance. Compared with metal pipes, plastic pipes have the advantages of being light, not easy to rust, not susceptible to moisture, long service life and low maintenance cost, which can save manpower and financial resources. It is now widely used in air conditioning installation. The advantages of rigid polyethylene pipe (PVC-U) for air conditioning condensate drain pipe are high strength, high rigidity and high hardness, good electrical insulation and good chemical stability. However, after the PVC-U air conditioner condensate drain pipe has been used for a long time, the inner wall of the pipe is easy to absorb dust, impurities and scale, resulting in more and more impurities trapped in the pipe, which eventually leads to pipe blockage and leakage. In addition, if dirt clogs the water pipe, the air-conditioning water will not be discharged in time, the pipe wall will corrode, and water leakage will occur over time. Therefore, maintenance or replacement of the condensation water pipe is often required.

[0003] How to improve the existing PVC-U condensate water pipe without super hydrophobic self-cleaning function or poor self-cleaning function, which will lead to pipe blockage and pipe leakage during long-term use. Therefore, it is of great significance to develop a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning and its preparation method.

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a super-hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning and a preparation method thereof, which solves the problem that the existing PVC-U condensate water pipe has no super-hydrophobic self-cleaning function or has poor self-cleaning function, which may cause pipe blockage and pipe leakage during long-term use.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A super-hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning, comprising the following components in parts by weight: 100 parts of polyvinyl chloride resin, 3-15 parts of hydrophobic titanium dioxide particles, 0.8-2.4 parts of hydrophobic enhancer, 0.6-1.2 parts of lubricant, 0.1-0.3 parts of antioxidant and 0.1-0.3 parts of ultraviolet absorber; Wherein, the hydrophobic titanium dioxide particles are prepared by the following steps: Step a1: adding anhydrous titanium tetrachloride, anhydrous ethanol and benzyl alcohol to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, introducing nitrogen protection, stirring the reaction at a temperature of -5-0°C and a stirring rate of 300-400r / min for 20-30min, then heating to 80-90°C and continuing to stir the reaction for 8-10h. After the reaction is completed, the reaction product is cooled to room temperature, then poured into ice ether, and then centrifuged. The precipitate is washed with distilled water for 2-3 times, and then placed in a vacuum drying oven and dried at a temperature of 60-65°C for 2-3h to obtain nano titanium dioxide; Step a2: Add nano titanium dioxide, anhydrous ethanol and deionized water to a three-necked flask equipped with a stirrer and a thermometer, stir and react for 20-30 minutes at a temperature of 25-30°C and a stirring rate of 300-400r / min, then adjust the pH to 9-10 with sodium hydroxide solution, then add heptafluorodecyltriethoxysilane and continue stirring and reacting for 20-30 minutes, then heat to 80-85°C and continue stirring and reacting for 3-5 hours, after the reaction is completed, cool the reaction product to room temperature, then centrifuge, place the precipitate in a vacuum drying oven, and dry it at a temperature of 70-75°C for 2-3 hours to obtain hydrophobic titanium dioxide particles.

[0007] As a further solution of the present invention: the usage ratio of the anhydrous titanium tetrachloride, anhydrous ethanol and benzyl alcohol in step a1 is 2-5 mL: 8-10 mL: 45-50 mL.

[0008] As a further solution of the present invention: the usage ratio of the nano titanium dioxide, anhydrous ethanol, deionized water and heptadecafluorodecyltriethoxysilane in step a2 is 10g:40-45mL:30-35mL:0.5-2.5g.

[0009] As a further solution of the present invention: the mass fraction of the sodium hydroxide solution in step a2 is 15-20%.

[0010] As a further solution of the present invention: the hydrophobic enhancer is prepared by the following steps: Step b1: Add 1,4,5,8-naphthalenetetracarboxylic anhydride and concentrated sulfuric acid to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, stir and react for 20-30 minutes at a temperature of 20-25° C. and a stirring rate of 300-400 r / min, then heat to 40-45° C. and continue stirring and reacting for 1-2 hours, then add iodine and add liquid bromine dropwise while stirring, and control the dropping rate to 1-2 drops / s, and after the dropwise addition is completed, heat to 80-85° C. and continue stirring and reacting for 10-15 hours. After the reaction is completed, cool the reaction product to room temperature, then add it to ice water, then stand it for precipitation, then vacuum filter it, wash the filter cake with distilled water 2-3 times, then place it in a vacuum drying oven, and dry it at a temperature of 80-85° C. for 2-3 hours to obtain intermediate 1; Step b2: Add intermediate 1, dimethyl sulfoxide and acetic acid to a three-necked flask equipped with a stirrer, a thermometer, an air guide tube and a reflux condenser, introduce nitrogen protection, stir and react for 20-30 minutes at a temperature of 20-25° C. and a stirring rate of 300-400 r / min, then add 2-octyldodecylamine and continue stirring and reacting for 3-5 hours under the condition of heating to reflux. After the reaction, cool the reaction product to room temperature, then rotary evaporate to remove the solvent, then wash with distilled water and anhydrous ethanol 2-3 times in sequence, then place in a vacuum drying oven, and dry at a temperature of 80-85° C. for 2-3 hours to obtain intermediate 2; Step b3: Add intermediate 2, perfluorobutanol, anhydrous potassium carbonate and N,N-dimethylformamide to a three-necked flask equipped with a stirrer, a thermometer and an air duct, introduce nitrogen protection, stir the reaction at a temperature of -5-0°C and a stirring rate of 300-400r / min for 1-2h, then raise the temperature to 100-110°C and continue stirring the reaction for 8-10h. After the reaction is completed, the reaction product is cooled to room temperature, then vacuum filtered, and the filtrate is rotary evaporated to remove the solvent, and then placed in a vacuum drying oven and dried at a temperature of 60-65°C for 5-6h to obtain a hydrophobic enhancer.

[0011] As a further solution of the present invention: the usage ratio of the 1,4,5,8-naphthalenetetracarboxylic anhydride, concentrated sulfuric acid, iodine and liquid bromine in step b1 is 10 mmol: 60-70 mL: 0.1-0.2 g: 20-40 mmol.

[0012] As a further solution of the present invention: the mass fraction of the concentrated sulfuric acid in step b1 is 98%.

[0013] As a further solution of the present invention: the usage ratio of the intermediate 1, dimethyl sulfoxide, acetic acid and 2-octyldodecylamine in step b2 is 10 mmol: 30-35 mL: 60-65 mL: 20 mmol.

[0014] As a further scheme of the present invention: the usage ratio of the intermediate 2, perfluorobutanol, anhydrous potassium carbonate and N,N-dimethylformamide in step b3 is 10mmol:20-40mmol:30-40mmol:100-120mL.

[0015] As a further solution of the present invention: a method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, comprising the following steps: Step 1: Weigh 100 parts of polyvinyl chloride resin, 3-15 parts of hydrophobic titanium dioxide particles, 0.8-2.4 parts of hydrophobic enhancer, 0.6-1.2 parts of lubricant, 0.1-0.3 parts of antioxidant and 0.1-0.3 parts of ultraviolet absorber according to weight parts, and set aside; Step 2: Evenly mix the polyvinyl chloride resin, hydrophobic titanium dioxide particles, hydrophobic enhancer, lubricant, antioxidant and ultraviolet absorber, then add them into an extruder for melt extrusion, and then cool and shape them to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

[0016] As a further solution of the present invention: the polyvinyl chloride resin is SG-5 polyvinyl chloride; the lubricant is a mixture of AC-400A polyethylene wax and calcium stearate in equal quantities; the antioxidant is one of antioxidant 246, antioxidant 702 and antioxidant 1010; the ultraviolet absorber is one of ultraviolet absorber UV-329 and ultraviolet absorber UV-531.

[0017] Beneficial effects of the present invention: The present invention discloses a super-hydrophobic self-cleaning PVC-U condensing water pipe for air conditioner and a preparation method thereof. The super-hydrophobic self-cleaning PVC-U condensing water pipe for air conditioner is obtained by uniformly mixing polyvinyl chloride resin, hydrophobic titanium dioxide particles, hydrophobic enhancer, lubricant, antioxidant and ultraviolet absorber, then adding the mixture into an extruder for melt extrusion, and then cooling and forming. The super-hydrophobic self-cleaning PVC-U condensing water pipe for air conditioner is obtained. The preparation method uses polyvinyl chloride resin as a main raw material, and adds hydrophobic titanium dioxide particles and hydrophobic enhancer thereto to realize super-hydrophobic surface design, realize self-cleaning function, so that dust, impurities and scale cannot adhere to the pipe wall of condensing water pipe, can keep the condensing water pipe unobstructed, effectively prevent the condensing water pipe from being blocked, improve drainage efficiency, ensure the normal operation of air conditioner, reduce corrosion and damage of condensing water pipe, and extend its service life. Moreover, the preparation method of the PVC-U condensing water pipe is simple, can be mass-produced, and improves the service life and efficiency of the pipeline while reducing the operating cost.

[0018] In the process of preparing a super-hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning, a hydrophobic titanium dioxide particle is first prepared. First, nano titanium dioxide is prepared using anhydrous titanium tetrachloride as a raw material, and then the nano titanium dioxide is treated with heptadecafluorodecyltriethoxysilane. The siloxane on the heptadecafluorodecyltriethoxysilane is hydrolyzed to form silanol, which can be grafted onto the surface of the nano titanium dioxide to obtain hydrophobic titanium dioxide particles; the addition of the hydrophobic titanium dioxide particles increases the strength of the inner wall of the condensation water pipe, greatly increases its wear resistance, so that the wall of the condensation water pipe remains smooth during long-term water impact, so that its self-cleaning performance is long-lasting, and a large number of CF bonds on the surface of the hydrophobic titanium dioxide particles can give it super-hydrophobic properties; In the process of preparing the super-hydrophobic self-cleaning PVC-U condenser water pipe for air conditioners, a hydrophobic enhancer is also prepared. First, 1,4,5,8-naphthalenetetracarboxylic anhydride and liquid bromine are reacted. Liquid bromine is used as a brominating agent to introduce a large number of bromine atoms into the naphthalene ring of 1,4,5,8-naphthalenetetracarboxylic anhydride to obtain intermediate 1. Then, intermediate 1 and 2-octyldodecylamine are reacted. The anhydride on intermediate 1 reacts with the amino group on 2-octyldodecylamine to form an imide group, and a long carbon chain is introduced at the same time to obtain intermediate 2. Finally, intermediate 2 and perfluorobutanol are reacted. The bromine atom on the intermediate 2 reacts with the hydroxyl group on the perfluorobutanol, and a large number of CF bonds are introduced to obtain a hydrophobic enhancer; the CF bonds and long carbon chains on the hydrophobic enhancer can give it a low surface energy, and under the synergistic effect with the hydrophobic titanium dioxide particles, its super hydrophobic self-cleaning performance can be further improved, and the long carbon chain can give the condensate pipe good flexibility, achieve the toughness of the condensate pipe in a wider temperature range, make the pipe have good temperature adaptability, and improve the problem that PVC-U is easy to be brittle and cracked at low temperatures. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1: This embodiment is a method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, comprising the following steps: Step S1: 10 mmol 1,4,5,8-naphthalenetetracarboxylic anhydride and 60 mL of concentrated sulfuric acid with a mass fraction of 98% are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture is stirred for reaction at a temperature of 20° C. and a stirring rate of 300 r / min for 20 min, and then the mixture is heated to 40° C. and the stirring reaction is continued for 1 h, and then 0.1 g iodine is added and 20 mmol liquid bromine is added dropwise while stirring, and the dropping rate is controlled to be 1 drop / s. After the dropwise addition is completed, the mixture is heated to 80° C. and the stirring reaction is continued for 10 h. After the reaction is completed, the reaction product is cooled to room temperature, and then added to ice water, and then allowed to stand to precipitate, and then vacuum filtered, and the filter cake is washed twice with distilled water, and then placed in a vacuum drying oven and dried at a temperature of 80° C. for 2 h to obtain intermediate 1; Step S2: 10 mmol of intermediate 1, 30 mL of dimethyl sulfoxide and 60 mL of acetic acid were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 20° C. and a stirring rate of 300 r / min for 20 min, and then 20 mmol of 2-octyldodecylamine was added and the mixture was heated to reflux and continued to stir for reaction for 3 h. After the reaction was completed, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The mixture was then washed twice with distilled water and anhydrous ethanol in sequence, and then placed in a vacuum drying oven and dried at a temperature of 80° C. for 2 h to obtain intermediate 2; Step S3: 10 mmol of intermediate 2, 20 mmol of perfluorobutanol, 30 mmol of anhydrous potassium carbonate and 100 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen was introduced for protection. The mixture was stirred at a temperature of -5°C and a stirring rate of 300 r / min for 1 hour, and then the temperature was raised to 100°C and the stirring reaction was continued for 8 hours. After the reaction was completed, the reaction product was cooled to room temperature, and then vacuum filtered. The filtrate was rotary evaporated to remove the solvent, and then placed in a vacuum drying oven and dried at a temperature of 60°C for 5 hours to obtain a hydrophobic enhancer; Step S4: 2 mL of anhydrous titanium tetrachloride, 8 mL of anhydrous ethanol and 45 mL of benzyl alcohol were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The mixture was stirred at a temperature of -5°C and a stirring rate of 300 r / min for 20 min, and then the mixture was heated to 80°C and stirred for 8 h. After the reaction, the reaction product was cooled to room temperature, poured into ice ether, and then centrifuged. The precipitate was washed twice with distilled water, and then placed in a vacuum drying oven and dried at a temperature of 60°C for 2 h to obtain nano titanium dioxide; Step S5: 10 g of nano titanium dioxide, 40 mL of anhydrous ethanol and 30 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 25° C. and a stirring rate of 300 r / min for 20 min, and then adjusted to pH 9 with a 15% mass fraction sodium hydroxide solution, and then added 0.5 g of heptadecafluorodecyltriethoxysilane and continued to stir for reaction for 20 min, and then heated to 80° C. and continued to stir for reaction for 3 h. After the reaction was completed, the reaction product was cooled to room temperature, and then centrifuged, and the precipitate was placed in a vacuum drying oven and dried at a temperature of 70° C. for 2 h to obtain hydrophobic titanium dioxide particles; Step S6: 100 parts of polyvinyl chloride resin, 3 parts of hydrophobic titanium dioxide particles, 0.8 parts of hydrophobic enhancer, 0.6 parts of lubricant, 0.1 parts of antioxidant and 0.1 parts of ultraviolet absorber are weighed in parts by weight for later use; the polyvinyl chloride resin is SG-5 type polyvinyl chloride; the lubricant is a mixture of AC-400A type polyethylene wax and calcium stearate in equal weight; the antioxidant is antioxidant 246; the ultraviolet absorber is ultraviolet absorber uv-329; Step S7: uniformly mix the polyvinyl chloride resin, hydrophobic titanium dioxide particles, hydrophobic enhancer, lubricant, antioxidant and ultraviolet absorber, then add them into an extruder for melt extrusion, and then cool and shape them to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

[0021] Embodiment 2: This embodiment is a method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, comprising the following steps: Step S1: 10 mmol 1,4,5,8-naphthalenetetracarboxylic anhydride and 65 mL of concentrated sulfuric acid with a mass fraction of 98% are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture is stirred for reaction at a temperature of 22° C. and a stirring rate of 350 r / min for 25 min, and then the mixture is heated to 42° C. and the stirring reaction is continued for 1.5 h, and then 0.15 g iodine is added and 30 mmol liquid bromine is added dropwise while stirring, and the dropping rate is controlled to be 1 drop / s. After the dropwise addition is completed, the mixture is heated to 82° C. and the stirring reaction is continued for 12 h. After the reaction is completed, the reaction product is cooled to room temperature, and then added to ice water, and then allowed to stand to precipitate, and then vacuum filtered, and the filter cake is washed twice with distilled water, and then placed in a vacuum drying oven and dried at a temperature of 82° C. for 2.5 h to obtain intermediate 1; Step S2: 10 mmol of intermediate 1, 32 mL of dimethyl sulfoxide and 62 mL of acetic acid were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 22° C. and a stirring rate of 350 r / min for 25 min. Then, 20 mmol of 2-octyldodecylamine was added and the mixture was heated to reflux and continued to stir for reaction for 4 h. After the reaction, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. The mixture was then washed twice with distilled water and anhydrous ethanol in sequence, and then placed in a vacuum drying oven and dried at a temperature of 82° C. for 2.5 h to obtain intermediate 2; Step S3: 10 mmol of intermediate 2, 30 mmol of perfluorobutanol, 35 mmol of anhydrous potassium carbonate and 110 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen was introduced for protection. The reaction was stirred at a temperature of -3°C and a stirring rate of 350 r / min for 1.5 h, and then the temperature was raised to 105°C and the stirring reaction was continued for 9 h. After the reaction was completed, the reaction product was cooled to room temperature, and then vacuum filtered, the filtrate was rotary evaporated to remove the solvent, and then placed in a vacuum drying oven and dried at a temperature of 62°C for 5.5 h to obtain a hydrophobic enhancer; Step S4: 3.5 mL of anhydrous titanium tetrachloride, 9 mL of anhydrous ethanol and 48 mL of benzyl alcohol were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The mixture was stirred at a temperature of -3°C and a stirring rate of 350 r / min for 25 min, and then the mixture was heated to 85°C and continued to stir for 9 h. After the reaction, the reaction product was cooled to room temperature, and then poured into ice ether, and then centrifuged. The precipitate was washed twice with distilled water, and then placed in a vacuum drying oven and dried at a temperature of 62°C for 2.5 h to obtain nano titanium dioxide; Step S5: 10 g of nano titanium dioxide, 42 mL of anhydrous ethanol and 32 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 28° C. and a stirring rate of 350 r / min for 25 min, and then adjusted to pH 9.5 with a sodium hydroxide solution having a mass fraction of 18%, and then 1.5 g of heptadecafluorodecyltriethoxysilane was added to continue stirring for reaction for 25 min, and then the temperature was raised to 82° C. and continued to stir for reaction for 4 h. After the reaction was completed, the reaction product was cooled to room temperature, and then centrifuged, and the precipitate was placed in a vacuum drying oven and dried at a temperature of 72° C. for 2.5 h to obtain hydrophobic titanium dioxide particles; Step S6: 100 parts of polyvinyl chloride resin, 9 parts of hydrophobic titanium dioxide particles, 1.6 parts of hydrophobic enhancer, 0.9 parts of lubricant, 0.2 parts of antioxidant and 0.2 parts of ultraviolet absorber are weighed in parts by weight for later use; the polyvinyl chloride resin is SG-5 type polyvinyl chloride; the lubricant is a mixture of AC-400A type polyethylene wax and calcium stearate in equal weight; the antioxidant is antioxidant 702; the ultraviolet absorber is ultraviolet absorber uv-329; Step S7: uniformly mix the polyvinyl chloride resin, hydrophobic titanium dioxide particles, hydrophobic enhancer, lubricant, antioxidant and ultraviolet absorber, then add them into an extruder for melt extrusion, and then cool and shape them to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

[0022] Embodiment 3: This embodiment is a method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, comprising the following steps: Step S1: 10 mmol 1,4,5,8-naphthalenetetracarboxylic anhydride and 70 mL of concentrated sulfuric acid with a mass fraction of 98% are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture is stirred for reaction at a temperature of 25° C. and a stirring rate of 400 r / min for 30 min, and then the mixture is heated to 45° C. and the stirring reaction is continued for 2 h, and then 0.2 g iodine is added and 40 mmol liquid bromine is added dropwise while stirring, and the dropping rate is controlled to be 2 drops / s. After the dropwise addition is completed, the mixture is heated to 85° C. and the stirring reaction is continued for 15 h. After the reaction is completed, the reaction product is cooled to room temperature, and then added to ice water, and then allowed to stand to precipitate, and then vacuum filtered, and the filter cake is washed with distilled water 3 times, and then placed in a vacuum drying oven, and dried at a temperature of 85° C. for 3 h to obtain intermediate 1; Step S2: 10 mmol of intermediate 1, 35 mL of dimethyl sulfoxide and 65 mL of acetic acid were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 25° C. and a stirring rate of 400 r / min for 30 min. Then, 20 mmol of 2-octyldodecylamine was added and the mixture was heated to reflux and continued to stir for reaction for 5 h. After the reaction, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. Then, the mixture was washed with distilled water and anhydrous ethanol for 3 times in sequence, and then placed in a vacuum drying oven and dried at a temperature of 85° C. for 3 h to obtain intermediate 2; Step S3: 10 mmol of intermediate 2, 40 mmol of perfluorobutanol, 40 mmol of anhydrous potassium carbonate and 120 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen was introduced for protection. The mixture was stirred at 0°C and a stirring rate of 400 r / min for 2 h, and then the mixture was heated to 110°C and stirred for 10 h. After the reaction, the reaction product was cooled to room temperature, and then vacuum filtered. The filtrate was rotary evaporated to remove the solvent, and then placed in a vacuum drying oven and dried at 65°C for 6 h to obtain a hydrophobic enhancer; Step S4: 5 mL of anhydrous titanium tetrachloride, 10 mL of anhydrous ethanol and 50 mL of benzyl alcohol were added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen was introduced for protection. The reaction was stirred at a temperature of 0° C. and a stirring rate of 400 r / min for 30 min, and then the temperature was raised to 90° C. and the stirring reaction was continued for 10 h. After the reaction was completed, the reaction product was cooled to room temperature, and then poured into ice ether, and then centrifuged. The precipitate was washed with distilled water for 3 times, and then placed in a vacuum drying oven and dried at a temperature of 65° C. for 3 h to obtain nano titanium dioxide; Step S5: 10 g of nano titanium dioxide, 45 mL of anhydrous ethanol and 35 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 30 min, and then adjusted to pH 10 with a 20% mass fraction sodium hydroxide solution, and then added 2.5 g of heptadecafluorodecyltriethoxysilane and continued to stir for reaction for 30 min, and then heated to 85° C. and continued to stir for reaction for 5 h. After the reaction was completed, the reaction product was cooled to room temperature, and then centrifuged, and the precipitate was placed in a vacuum drying oven and dried at a temperature of 75° C. for 3 h to obtain hydrophobic titanium dioxide particles; Step S6: 100 parts of polyvinyl chloride resin, 15 parts of hydrophobic titanium dioxide particles, 2.4 parts of hydrophobic enhancer, 1.2 parts of lubricant, 0.3 parts of antioxidant and 0.3 parts of ultraviolet absorber are weighed in parts by weight for later use; the polyvinyl chloride resin is SG-5 type polyvinyl chloride; the lubricant is a mixture of AC-400A type polyethylene wax and calcium stearate in equal weight; the antioxidant is antioxidant 1010; the ultraviolet absorber is ultraviolet absorber uv-531; Step S7: uniformly mix the polyvinyl chloride resin, hydrophobic titanium dioxide particles, hydrophobic enhancer, lubricant, antioxidant and ultraviolet absorber, then add them into an extruder for melt extrusion, and then cool and shape them to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

[0023] Comparative Example 1: This comparative example is a method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, comprising the following steps: Step S1: 100 parts of polyvinyl chloride resin, 1.2 parts of lubricant, 0.3 parts of antioxidant and 0.3 parts of ultraviolet absorber are weighed in parts by weight for later use; the polyvinyl chloride resin is SG-5 type polyvinyl chloride; the lubricant is a mixture of AC-400A type polyethylene wax and calcium stearate in equal weight; the antioxidant is antioxidant 1010; the ultraviolet absorber is ultraviolet absorber uv-531; Step S2: The polyvinyl chloride resin, lubricant, antioxidant and ultraviolet absorber are mixed evenly, and then added into an extruder for melt extrusion, and then cooled and formed to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

[0024] Comparative Example 2: This comparative example is a method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, comprising the following steps: Step S1: 5 mL of anhydrous titanium tetrachloride, 10 mL of anhydrous ethanol and 50 mL of benzyl alcohol are added to a three-necked flask equipped with a stirrer, a thermometer and an air guide tube, and nitrogen is introduced for protection. The mixture is stirred at 0° C. and a stirring rate of 400 r / min for 30 min, and then the mixture is heated to 90° C. and the stirring reaction is continued for 10 h. After the reaction is completed, the reaction product is cooled to room temperature, and then poured into ice ether, and then centrifuged. The precipitate is washed with distilled water for 3 times, and then placed in a vacuum drying oven and dried at 65° C. for 3 h to obtain nano titanium dioxide; Step S2: 10 g of nano titanium dioxide, 45 mL of anhydrous ethanol and 35 mL of deionized water were added to a three-necked flask equipped with a stirrer and a thermometer, and stirred for reaction at a temperature of 30° C. and a stirring rate of 400 r / min for 30 min, and then adjusted to pH 10 with a 20% mass fraction sodium hydroxide solution, and then added 2.5 g of heptadecafluorodecyltriethoxysilane and continued to stir for reaction for 30 min, and then heated to 85° C. and continued to stir for reaction for 5 h. After the reaction was completed, the reaction product was cooled to room temperature, and then centrifuged, and the precipitate was placed in a vacuum drying oven and dried at a temperature of 75° C. for 3 h to obtain hydrophobic titanium dioxide particles; Step S3: 100 parts of polyvinyl chloride resin, 15 parts of hydrophobic titanium dioxide particles, 1.2 parts of lubricant, 0.3 parts of antioxidant and 0.3 parts of ultraviolet absorber are weighed in parts by weight for later use; the polyvinyl chloride resin is SG-5 type polyvinyl chloride; the lubricant is a mixture of AC-400A type polyethylene wax and calcium stearate in equal weight; the antioxidant is antioxidant 1010; the ultraviolet absorber is ultraviolet absorber uv-531; Step S4: uniformly mix the polyvinyl chloride resin, hydrophobic titanium dioxide particles, lubricant, antioxidant and ultraviolet absorber, then add them into an extruder for melt extrusion, and then cool and shape them to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

[0025] Comparative Example 3: This comparative example is a method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, comprising the following steps: Step S1: 10 mmol 1,4,5,8-naphthalenetetracarboxylic anhydride and 70 mL of concentrated sulfuric acid with a mass fraction of 98% are added to a three-necked flask equipped with a stirrer, a thermometer and a constant pressure dropping funnel, and the mixture is stirred for reaction at a temperature of 25° C. and a stirring rate of 400 r / min for 30 min, and then the mixture is heated to 45° C. and the stirring reaction is continued for 2 h, and then 0.2 g iodine is added and 40 mmol liquid bromine is added dropwise while stirring, and the dropping rate is controlled to be 2 drops / s. After the dropwise addition is completed, the mixture is heated to 85° C. and the stirring reaction is continued for 15 h. After the reaction is completed, the reaction product is cooled to room temperature, and then added to ice water, and then allowed to stand to precipitate, and then vacuum filtered, and the filter cake is washed with distilled water 3 times, and then placed in a vacuum drying oven, and dried at a temperature of 85° C. for 3 h to obtain intermediate 1; Step S2: 10 mmol of intermediate 1, 35 mL of dimethyl sulfoxide and 65 mL of acetic acid were added to a three-necked flask equipped with a stirrer, a thermometer, a gas guide tube and a reflux condenser, and nitrogen was introduced for protection. The mixture was stirred for reaction at a temperature of 25° C. and a stirring rate of 400 r / min for 30 min. Then, 20 mmol of 2-octyldodecylamine was added and the mixture was heated to reflux and continued to stir for reaction for 5 h. After the reaction, the reaction product was cooled to room temperature, and then the solvent was removed by rotary evaporation. Then, the mixture was washed with distilled water and anhydrous ethanol for 3 times in sequence, and then placed in a vacuum drying oven and dried at a temperature of 85° C. for 3 h to obtain intermediate 2; Step S3: 10 mmol of intermediate 2, 40 mmol of perfluorobutanol, 40 mmol of anhydrous potassium carbonate and 120 mL of N,N-dimethylformamide were added to a three-necked flask equipped with a stirrer, a thermometer and an air duct, and nitrogen was introduced for protection. The mixture was stirred at 0°C and a stirring rate of 400 r / min for 2 h, and then the mixture was heated to 110°C and stirred for 10 h. After the reaction, the reaction product was cooled to room temperature, and then vacuum filtered. The filtrate was rotary evaporated to remove the solvent, and then placed in a vacuum drying oven and dried at 65°C for 6 h to obtain a hydrophobic enhancer; Step S4: 100 parts of polyvinyl chloride resin, 2.4 parts of hydrophobic enhancer, 1.2 parts of lubricant, 0.3 parts of antioxidant and 0.3 parts of ultraviolet absorber are weighed in parts by weight for later use; the polyvinyl chloride resin is SG-5 type polyvinyl chloride; the lubricant is a mixture of AC-400A type polyethylene wax and calcium stearate in equal weight; the antioxidant is antioxidant 1010; the ultraviolet absorber is ultraviolet absorber uv-531; Step S5: uniformly mix the polyvinyl chloride resin, hydrophobic enhancer, lubricant, antioxidant and ultraviolet absorber, then add them into an extruder for melt extrusion, and then cool and shape them to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

[0026] The super hydrophobic self-cleaning PVC-U condensate water pipes for air conditioners of Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests, and the test results are shown in the following table: Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-3, it can be learned that the addition of hydrophobic titanium dioxide particles and hydrophobic enhancers can greatly improve the hydrophobic properties of the PVC-U condensate water pipe, and the synergistic effect of the two makes the prepared PVC-U condensate water pipe have excellent hydrophobic properties.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined in this application, they shall all fall within the protection scope of the present invention.

Claims

1. A super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, characterized in that: It comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 3-15 parts of hydrophobic titanium dioxide particles, 0.8-2.4 parts of hydrophobic enhancer, 0.6-1.2 parts of lubricant, 0.1-0.3 parts of antioxidant and 0.1-0.3 parts of ultraviolet absorber; Wherein, the hydrophobic titanium dioxide particles are prepared by the following steps: Step a1: stirring anhydrous titanium tetrachloride, anhydrous ethanol and benzyl alcohol for reaction, cooling the reaction product after the reaction is completed, then pouring it into ice ether, and then centrifuging it, washing and drying the precipitate to obtain nano titanium dioxide; Step a2: Stirring nano-titanium dioxide, anhydrous ethanol and deionized water for reaction, then adjusting the pH with sodium hydroxide solution, then adding heptafluorodecyltriethoxysilane and continuing stirring the reaction, cooling the reaction product after the reaction is completed, then centrifuging, and drying the precipitate to obtain hydrophobic titanium dioxide particles.

2. A super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 1, characterized in that: The usage ratio of the anhydrous titanium tetrachloride, anhydrous ethanol and benzyl alcohol in step a1 is 2-5 mL: 8-10 mL: 45-50 mL.

3. The super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 1, characterized in that: The usage ratio of the nano titanium dioxide, anhydrous ethanol, deionized water and heptadecafluorodecyltriethoxysilane in step a2 is 10g:40-45mL:30-35mL:0.5-2.5g.

4. The super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 1, characterized in that: The mass fraction of the sodium hydroxide solution in step a2 is 15-20%.

5. The super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 1, characterized in that: The hydrophobic enhancer is prepared by the following steps: Step b1: 1,4,5,8-naphthalenetetracarboxylic anhydride and concentrated sulfuric acid are stirred for reaction, and then iodine is added and liquid bromine is added dropwise while stirring. After the addition is completed, the stirring reaction is continued. After the reaction is completed, the reaction product is cooled, and then added to ice water, and then allowed to stand for precipitation, and then vacuum filtered, the filter cake is washed and dried to obtain intermediate 1; Step b2: stirring the intermediate 1, dimethyl sulfoxide and acetic acid for reaction, then adding 2-octyldodecylamine and continuing stirring for reaction, cooling the reaction product after the reaction is completed, then rotary evaporating, then washing and drying to obtain the intermediate 2; Step b3: Stir the intermediate 2, perfluorobutanol, anhydrous potassium carbonate and N,N-dimethylformamide for reaction. After the reaction is completed, cool the reaction product, then vacuum filter it, rotary evaporate the filtrate, and then dry it to obtain a hydrophobic enhancer.

6. The super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 5, characterized in that: The usage ratio of the 1,4,5,8-naphthalenetetracarboxylic anhydride, concentrated sulfuric acid, iodine and liquid bromine in step b1 is 10mmol:60-70mL:0.1-0.2g:20-40mmol.

7. The super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 5, characterized in that: The mass fraction of the concentrated sulfuric acid in step b1 is 98%.

8. The super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 5, characterized in that: The usage ratio of the intermediate 1, dimethyl sulfoxide, acetic acid and 2-octyldodecylamine in step b2 is 10 mmol: 30-35 mL: 60-65 mL: 20 mmol.

9. The super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning according to claim 5, characterized in that: The usage ratio of the intermediate 2, perfluorobutanol, anhydrous potassium carbonate and N,N-dimethylformamide in step b3 is 10 mmol: 20-40 mmol: 30-40 mmol: 100-120 mL.

10. A method for preparing a super hydrophobic self-cleaning PVC-U condensate water pipe for air conditioning, characterized in that: The following steps are involved: Step 1: weigh 100 parts of polyvinyl chloride resin, 3-15 parts of hydrophobic titanium dioxide particles, 0.8-2.4 parts of hydrophobic enhancer, 0.6-1.2 parts of lubricant, 0.1-0.3 parts of antioxidant and 0.1-0.3 parts of ultraviolet absorber according to weight parts, and set aside; the polyvinyl chloride resin is SG-5 type polyvinyl chloride; the lubricant is a mixture of AC-400A type polyethylene wax and calcium stearate in equal weight; the antioxidant is one of antioxidant 246, antioxidant 702 and antioxidant 1010; the ultraviolet absorber is one of ultraviolet absorber uv-329 and ultraviolet absorber uv-531; Step 2: Evenly mix the polyvinyl chloride resin, hydrophobic titanium dioxide particles, hydrophobic enhancer, lubricant, antioxidant and ultraviolet absorber, then add them into an extruder for melt extrusion, and then cool and shape them to obtain a super hydrophobic self-cleaning PVC-U condensation water pipe for air conditioning.

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