Preparation method of high-strength anti-aging PVC-U drain pipe

Abstract

The invention relates to a preparation method of a high-strength anti-aging PVC-U drain pipe. The preparation method comprises the following steps: step 1, preparing a nanoscale polytetramethylene ether glycol emulsion; 2, preparing a composite emulsion; and step 3, mixing the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methyl phenyl propane-1-ketone, dibenzyl isopropyl phenyl phenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-scale silicon dioxide, and then carrying out a reaction under a sealing condition. After the reaction is completed, demulsifying, filtering, washing and drying to obtain composite particles; and 4, mixing and melting the composite particles and PVC particles, extruding through a twin-screw extruder matched with a mold, cooling, shaping and cutting to obtain the PVC-U drainage pipe. While the production is accelerated, the anti-aging performance under the irradiation of ultraviolet rays can also be improved, so that the material can be stably used for a long time under the irradiation of strong sunlight.

Description

Technical Field

[0001] The invention belongs to the field of server maintenance, and in particular relates to a method for preparing a high-strength anti-aging PVC-U drainage pipe. Background Art

[0002] PVC-U drainage pipes are currently the most common drainage pipes. Due to their high physical and chemical properties and long-term stable use underground, they can be used stably for decades. However, PVC-U drainage pipes are often used as buried pipes and have excellent performance. However, in modern use, it is found that the service life of PVC-U drainage pipes is significantly reduced when used outdoors. After research, it is found that their light resistance and aging resistance are poor, especially under long-term strong sunlight, their performance will be significantly reduced. Therefore, there is an urgent need for a PVC-U drainage pipe that can still be used stably under long-term strong sunlight outdoors. Summary of the Invention

[0003] The present invention provides a method for preparing a high-strength and anti-aging PVC-U drainage pipe, so as to solve the defects in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A method for preparing a high-strength, anti-aging PVC-U drainage pipe comprises the following steps:

[0006] Step 1: Nano-scale polytetramethylene ether glycol, nano-scale butyl methacrylate, triglycerol monostearate, glyceryl monolaurate, trimethylolpropane tris[3-(2-methylaziridinyl)propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water are fully mixed and reacted under sealed conditions to obtain a nano-scale polytetramethylene ether glycol emulsion after the reaction is completed;

[0007] Step 2: fully mixing nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water, and reacting the mixture under sealed conditions to obtain a composite emulsion after the reaction is completed;

[0008] Step 3: mixing the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate, and modified nano-scale silica, and reacting the mixture under sealed conditions. After the reaction is completed, demulsification, filtration, washing, and drying are performed to obtain composite particles.

[0009] Step 4: After the composite particles and PVC particles are mixed and melted, they are extruded through a twin-screw extruder with a mold, cooled, shaped and cut to obtain high-strength and aging-resistant PVC-U drainage pipes.

[0010] As described above, the method for preparing a high-strength and aging-resistant PVC-U drainage pipe, the reaction temperature in the step one is 70-80°C, the reaction time is 4-5h, the reaction pressure is 4000-8000Pa, the reaction stirring speed is 400-600r / min, and nitrogen protection is continued during the reaction until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, the ultraviolet light irradiation intensity is 30-40MeV, and the ultraviolet light irradiation time is 2-3h.

[0011] The method for preparing a high-strength and aging-resistant PVC-U drainage pipe as described above, in step 1, the mass ratios of nano-scale polytetramethylene ether glycol, nano-scale butyl methacrylate, triglycerol monostearate, glycerol monolaurate, trimethylolpropane tris[3-(2-methylaziridinyl)propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water are: 150-180: 40-60: 0.5-1.5: 0.6-0.8: 1-2: 2-4: 0.4-0.6: 6-8: 400-500.

[0012] As described above, the preparation method of a high-strength and aging-resistant PVC-U drainage pipe, the reaction temperature in the step 2 is 70-90°C, the reaction time is 3-4h, the reaction pressure is 5000-9000Pa, the reaction stirring speed is 700-800r / min, and nitrogen protection is continued during the reaction until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, the ultraviolet light irradiation intensity is 50-60MeV, and the ultraviolet light irradiation time is 1-2h.

[0013] The method for preparing a high-strength, aging-resistant PVC-U drainage pipe as described above, wherein the mass ratio of the nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water in step 2 is: 400-600:20-30:10-20:1-2:0.4-0.6:0.5-0.9:0.8-1:20-30:200-300.

[0014] As described above, the preparation method of a high-strength and aging-resistant PVC-U drainage pipe, the reaction temperature in the step three is 80-90°C, the reaction time is 5-6h, the reaction pressure is 7000-9000Pa, the reaction stirring speed is 500-700r / min, and nitrogen protection is continued during the reaction until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, the ultraviolet light irradiation intensity is 40-50MeV, and the ultraviolet light irradiation time is 4-5h.

[0015] The method for preparing a high-strength and aging-resistant PVC-U drainage pipe as described above, in step three, the mass ratio of the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-scale silica is: 500-600:10-20:10-20:10-20:1-2:2-3:0.5-1:0.4-0.7:0.3-0.5:10-20.

[0016] In the above-mentioned method for preparing a high-strength and aging-resistant PVC-U drainage pipe, the modified nano-scale silica is alkyl-modified nano-scale silica.

[0017] According to the method for preparing a high-strength and aging-resistant PVC-U drainage pipe as described above, the demulsifier added in the demulsification operation in step three is SGR1710 demulsifier, and the addition amount of the demulsifier is 0.5-0.9 g / kg. After the demulsifier is added, the temperature is raised to 80-90°C at a stirring speed of 1000-1200 r / min, and the mixture is kept warm and stirred for 30-40 minutes, then cooled to room temperature and filtered. After the filtration is completed, the mixture is rinsed with deionized water 3-5 times and then dried at a temperature of 70-80°C for 20-30 minutes.

[0018] The method for preparing a high-strength and aging-resistant PVC-U drainage pipe as described above, wherein the mass ratio of the composite particles to the PVC particles in the step 4 is 1:7-9; the composite particles and the PVC particles are mixed and crushed before being mixed and sieved through a 300-mesh sieve for standby use; the mixing temperature of the crushed composite particles and PVC particles is 130-150°C, the mixing and stirring speed is 200-300r / min, the mixing time is 20-30min, and ultraviolet light is used for irradiation during the mixing process, and the ultraviolet light irradiation intensity is 40-50MeV. After the mixing is completed, the mixed material is transferred to a twin-screw extruder, the inlet temperature of the twin-screw extruder is 130-140°C, the outlet temperature of the twin-screw extruder is 90-100°C, and the cooling method for extrusion cooling and shaping is water cooling.

[0019] The advantages of the present invention are as follows: by preparing nano-scale polytetramethylene ether glycol into an emulsion and then adding it, the nano-scale polytetramethylene ether glycol can be evenly dispersed, thereby increasing strength and anti-aging properties. Polytetramethylene ether glycol itself has good anti-aging and corrosion resistance, and the nano-scale treatment can further help it to be evenly dispersed. At the same time, by adding alkyl-modified nano-scale silica, alkyl groups are introduced to the surface of the nano-scale silica, which can effectively improve its dispersibility and compatibility in organic media. After alkyl modification, the surface properties of the nano-scale silica change from hydrophilic to lipophilic, allowing it to be better dispersed in the organic medium and form a good interface with the organic matrix, thereby improving the anti-aging properties of the composite. In addition, the present invention accelerates radiation cross-linking by ultraviolet irradiation, which not only accelerates production but also increases the anti-aging properties under ultraviolet irradiation, thereby enabling long-term stable use under strong sunlight. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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 making creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1

[0022] Step 1: After fully mixing nano-scale polytetramethylene ether glycol, nano-scale butyl methacrylate, triglycerol monostearate, monolaurin, trimethylolpropane tris[3-(2-methylaziridinyl) propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water, the mixture is reacted under sealed conditions at a reaction temperature of 70° C., a reaction time of 5 h, a reaction pressure of 4000 Pa, a reaction stirring speed of 400 r / min, and continuous nitrogen protection until the reaction is completed. At the same time, ultraviolet irradiation can be performed during the reaction, with an ultraviolet irradiation intensity of 30 MeV and an ultraviolet irradiation time of 3 h. After the reaction is completed, a nano-scale polytetramethylene ether glycol emulsion is obtained;

[0023] The mass ratio of nano-polytetramethylene ether glycol, nano-butyl methacrylate, triglycerol monostearate, glyceryl monolaurate, trimethylolpropane tris[3-(2-methylaziridinyl)propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water is 150:40:0.5:0.6:1:2:0.4:6:400.

[0024] Step 2: After fully mixing nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water, the mixture is reacted under sealed conditions at a reaction temperature of 70° C., a reaction time of 4 h, a reaction pressure of 5000 Pa, a reaction stirring speed of 700 r / min, and continuous nitrogen protection until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, with an ultraviolet light irradiation intensity of 50 MeV and an ultraviolet light irradiation time of 2 h. After the reaction is completed, a composite emulsion is obtained;

[0025] The mass ratio of nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water is: 400:20:10:1:0.4:0.5:0.8:20:200;

[0026] Step 3: The composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-silica are mixed and reacted under sealed conditions. The reaction temperature is 80°C, the reaction time is 6h, the reaction pressure is 7000Pa, the reaction stirring speed is 500r / min, and nitrogen protection is continuously applied during the reaction until the reaction is complete. The reaction was completed, and ultraviolet irradiation was performed during the reaction. The ultraviolet irradiation intensity was 40 MeV and the ultraviolet irradiation time was 5 h. After the reaction was completed, SGR1710 demulsifier was added in an amount of 0.5 g / kg. After the demulsifier was added, the temperature was raised to 80°C at a stirring speed of 1000 r / min, and the mixture was stirred for 40 min. Then, the mixture was cooled to room temperature and filtered. After the filtration was completed, the mixture was rinsed with deionized water 3 times and then dried at 70°C for 30 min to obtain composite particles.

[0027] The mass ratio of the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-scale silica is 500:10:10:10:1:2:0.5:0.4:0.3:10;

[0028] Step 4: The composite particles and PVC particles are weighed in a mass ratio of 1:7; the composite particles and PVC particles are mixed and crushed before mixing and passed through a 300-mesh sieve for later use. The mixing temperature of the crushed composite particles and PVC particles is 130°C, the mixing stirring speed is 200r / min, the mixing time is 30min, and ultraviolet light is used for irradiation during the mixing process. The ultraviolet light intensity is 40MeV. After mixing is completed, the mixed material is transferred to a twin-screw extruder. The inlet temperature of the twin-screw extruder is 130°C, and the outlet temperature of the twin-screw extruder is 90°C. After extrusion through the corresponding mold, it is cooled by water cooling and shaped and cut to obtain a high-strength and aging-resistant PVC-U drainage pipe.

[0029] Example 2

[0030] Step 1: After fully mixing nano-scale polytetramethylene ether glycol, nano-scale butyl methacrylate, triglycerol monostearate, monolaurin, trimethylolpropane tris[3-(2-methylaziridinyl) propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water, the mixture is reacted under sealed conditions at a reaction temperature of 80° C., a reaction time of 4 h, a reaction pressure of 8000 Pa, a reaction stirring speed of 600 r / min, and continuous nitrogen protection until the reaction is completed. At the same time, ultraviolet irradiation can be performed during the reaction, with an ultraviolet irradiation intensity of 40 MeV and an ultraviolet irradiation time of 2 h. After the reaction is completed, a nano-scale polytetramethylene ether glycol emulsion is obtained;

[0031] The mass ratio of nano-polytetramethylene ether glycol, nano-butyl methacrylate, triglycerol monostearate, glyceryl monolaurate, trimethylolpropane tris[3-(2-methylaziridinyl)propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water is 180:60:1.5:0.8:2:4:0.6:8:500;

[0032] Step 2: After fully mixing nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water, the mixture is reacted under sealed conditions at a reaction temperature of 90° C., a reaction time of 3 h, a reaction pressure of 9000 Pa, a reaction stirring speed of 800 r / min, and continuous nitrogen protection until the reaction is completed. UV irradiation can be performed during the reaction, with an UV irradiation intensity of 60 MeV and a UV irradiation time of 1 h. After the reaction is completed, a composite emulsion is obtained;

[0033] The mass ratio of nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water is: 600:30:20:2:0.6:0.9:1:30:300;

[0034] Step 3: The composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-silica are mixed and reacted under sealed conditions. The reaction temperature is 90°C, the reaction time is 5h, the reaction pressure is 9000Pa, the reaction stirring speed is 700r / min, and nitrogen protection is continuously applied during the reaction until the reaction is complete. The reaction was terminated, and ultraviolet irradiation was performed during the reaction. The ultraviolet irradiation intensity was 50 MeV, and the ultraviolet irradiation time was 4 h. After the reaction was completed, SGR1710 demulsifier was added in an amount of 0.9 g / kg. After the demulsifier was added, the mixture was heated to 90° C. at a stirring speed of 1200 r / min, kept warm and stirred for 30 min, and then cooled to room temperature and filtered. After filtration, the mixture was rinsed with deionized water 5 times, and then dried at 80° C. for 20 min to obtain composite particles.

[0035] The mass ratio of the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-scale silica is: 600:20:20:20:2:3:1:0.7:0.5:20;

[0036] Step 4: The composite particles and PVC particles are weighed in a mass ratio of 1:9; the composite particles and PVC particles are mixed and crushed before mixing and passed through a 300-mesh sieve for later use. The mixing temperature of the crushed composite particles and PVC particles is 150°C, the mixing stirring speed is 300r / min, the mixing time is 20min, and ultraviolet light is used for irradiation during the mixing process. The ultraviolet light intensity is 50MeV. After mixing is completed, the mixture is transferred to a twin-screw extruder. The inlet temperature of the twin-screw extruder is 140°C, and the outlet temperature of the twin-screw extruder is 100°C. After extrusion through the corresponding mold, it is cooled by water cooling and shaped and cut to obtain a high-strength and aging-resistant PVC-U drainage pipe.

[0037] Example 3

[0038] Step 1: After fully mixing nano-scale polytetramethylene ether glycol, nano-scale butyl methacrylate, triglycerol monostearate, monolaurin, trimethylolpropane tris[3-(2-methylaziridinyl) propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water, the mixture is reacted under sealed conditions at a reaction temperature of 75° C., a reaction time of 4.5 h, a reaction pressure of 6000 Pa, a reaction stirring speed of 500 r / min, and continuous nitrogen protection until the reaction is completed. At the same time, ultraviolet irradiation can be performed during the reaction, with an ultraviolet irradiation intensity of 35 MeV and an ultraviolet irradiation time of 2.5 h. After the reaction is completed, a nano-scale polytetramethylene ether glycol emulsion is obtained;

[0039] The mass ratio of nano-polytetramethylene ether glycol, nano-butyl methacrylate, triglycerol monostearate, glyceryl monolaurate, trimethylolpropane tris[3-(2-methylaziridinyl)propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water is 165:50:1:0.7:1.5:3:0.5:7:450;

[0040] Step 2: After fully mixing nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water, the mixture is reacted under sealed conditions at a reaction temperature of 80° C., a reaction time of 3.5 h, a reaction pressure of 7000 Pa, a reaction stirring speed of 750 r / min, and continuous nitrogen protection until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, with an ultraviolet light irradiation intensity of 55 MeV and an ultraviolet light irradiation time of 1.5 h. After the reaction is completed, a composite emulsion is obtained;

[0041] The mass ratio of nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water is: 500:25:15:1.5:0.5:0.7:0.9:25:250;

[0042] Step 3: The composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-silica are mixed and reacted under sealed conditions. The reaction temperature is 85°C, the reaction time is 5.5h, the reaction pressure is 8000Pa, the reaction stirring speed is 600r / min, and nitrogen protection is continuously applied during the reaction until the reaction is complete. The reaction was completed, and ultraviolet irradiation was performed during the reaction. The ultraviolet irradiation intensity was 45 MeV, and the ultraviolet irradiation time was 4.5 h. After the reaction was completed, SGR1710 demulsifier was added in an amount of 0.7 g / kg. After the demulsifier was added, the temperature was raised to 85°C at a stirring speed of 1100 r / min, and the mixture was stirred for 35 min. Then, the mixture was cooled to room temperature and filtered. After the filtration was completed, the mixture was rinsed with deionized water 4 times, and then dried at 75°C for 25 min to obtain composite particles.

[0043] The mass ratio of the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-scale silica is: 550:15:15:15:1.5:2.5:0.8:0.6:0.4:15;

[0044] Step 4: The composite particles and PVC particles are weighed in a mass ratio of 1:8; the composite particles and PVC particles are mixed and crushed before mixing and passed through a 300-mesh sieve for later use. The mixing temperature of the crushed composite particles and PVC particles is 140°C, the mixing stirring speed is 250r / min, the mixing time is 25min, and ultraviolet light is used for irradiation during the mixing process. The ultraviolet light intensity is 45MeV. After mixing is completed, the mixed material is transferred to a twin-screw extruder. The inlet temperature of the twin-screw extruder is 135°C, and the outlet temperature of the twin-screw extruder is 95°C. After extrusion through the corresponding mold, it is cooled by water cooling and shaped and cut to obtain a high-strength and aging-resistant PVC-U drainage pipe.

[0045] The high-strength, aging-resistant PVC-U drain pipes prepared in Examples 1-3 and three commercially available PVC-U drain pipes of the same size were used as control examples 1-3 for performance testing. The xenon lamp aging test was performed according to the method of GB T 8814-2004 for 4000 hours to simulate continuous exposure to normal strong sunlight. The tensile yield strength before and after aging was tested according to the method of GB / T 8804.2-2003, the bending strength before and after aging was tested according to the method of GB / T 9341-2008, and the impact strength before and after aging was tested according to the method of GB / T 5836.1-2018. The test results are shown in Table 1.

[0046]

[0047]

[0048] Table 1

[0049] It can be seen from the data in Table 1 that the tensile yield strength, bending strength and impact strength of the high-strength and aging-resistant PVC-U drainage pipes prepared in Examples 1-3 of the present invention before the aging test are slightly better than those of Comparative Examples 1-3. After the aging test, the tensile yield strength, bending strength and impact strength of the high-strength and aging-resistant PVC-U drainage pipes prepared in Examples 1-3 of the present invention are far better than those of Comparative Examples 1-3. This proves that the high-strength and aging-resistant PVC-U drainage pipes prepared in the present invention can minimize the performance failure under long-term strong sunlight exposure outdoors, so that they can still have relatively good performance under long-term strong sunlight exposure outdoors, so that they can play an anti-aging role and maintain high performance in outdoor environments, thereby ensuring that the PVC-U drainage pipes can be used stably outdoors for a long time.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for preparing a high-strength, anti-aging PVC-U drainage pipe, characterized by: The steps include: Step 1: Nano-scale polytetramethylene ether glycol, nano-scale butyl methacrylate, triglycerol monostearate, glyceryl monolaurate, trimethylolpropane tris[3-(2-methylaziridinyl)propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water are fully mixed and reacted under sealed conditions to obtain a nano-scale polytetramethylene ether glycol emulsion after the reaction is completed; Step 2: fully mixing nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water, and reacting the mixture under sealed conditions to obtain a composite emulsion after the reaction is completed; Step 3: mixing the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate, and modified nano-scale silica, and reacting the mixture under sealed conditions. After the reaction is completed, demulsification, filtration, washing, and drying are performed to obtain composite particles. Step 4: After the composite particles and PVC particles are mixed and melted, they are extruded through a twin-screw extruder with a mold, cooled, shaped and cut to obtain high-strength and aging-resistant PVC-U drainage pipes.

2. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: The reaction temperature in step 1 is 70-80°C, the reaction time is 4-5h, the reaction pressure is 4000-8000Pa, the reaction stirring speed is 400-600r / min, and nitrogen protection is continued during the reaction until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, the ultraviolet light irradiation intensity is 30-40MeV, and the ultraviolet light irradiation time is 2-3h.

3. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: In the step 1, the mass ratio of nano-scale polytetramethylene ether glycol, nano-scale butyl methacrylate, triglycerol monostearate, glyceryl monolaurate, trimethylolpropane tris[3-(2-methylaziridinyl)propionate], 4-butanediol diacrylate, acetophenone, vinyl acetate and deionized water is: 150-180: 40-60: 0.5-1.5: 0.6-0.8: 1-2: 2-4: 0.4-0.6: 6-8: 400-500.

4. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: The reaction temperature in the step 2 is 70-90°C, the reaction time is 3-4h, the reaction pressure is 5000-9000Pa, the reaction stirring speed is 700-800r / min, and nitrogen protection is continued during the reaction until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, the ultraviolet light irradiation intensity is 50-60MeV, and the ultraviolet light irradiation time is 1-2h.

5. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: In the second step, the mass ratio of the nano-scale polytetramethylene ether glycol emulsion, propylene oxide, isoprene, isophorone diisocyanate, trimethylolpropane trimethacrylate, azobisisobutyronitrile, fatty alcohol polyoxyethylene ether, modified nano-scale silica and deionized water is: 400-600:20-30:10-20:1-2:0.4-0.6:0.5-0.9:0.8-1:20-30:200:-300.

6. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: The reaction temperature in step 3 is 80-90°C, the reaction time is 5-6h, the reaction pressure is 7000-9000Pa, the reaction stirring speed is 500-700r / min, and nitrogen protection is continued during the reaction until the reaction is completed. At the same time, ultraviolet light irradiation can be carried out during the reaction, the ultraviolet light irradiation intensity is 40-50MeV, and the ultraviolet light irradiation time is 4-5h.

7. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: The mass ratio of the composite emulsion, styrene, butadiene, isoprene, triallyl isocyanurate, secondary alcohol polyoxyethylene ether, 2-hydroxy-2-methylphenylpropane-1-one, dibenzyl isopropylphenol polyoxyethylene ether, sodium lauroyl methyl taurate and modified nano-scale silica in the step 3 is: 500-600:10-20:10-20:10-20:1-2:2-3:0.5-1:0.4-0.7:0.3-0.5:10-20.

8. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: The modified nano-scale silicon dioxide is alkyl-modified nano-scale silicon dioxide.

9. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: The demulsifier added in the demulsification operation in the step 3 is SGR1710 demulsifier, and the addition amount of the demulsifier is 0.5-0.9 g / kg. After the demulsifier is added, the temperature is raised to 80-90°C at a stirring speed of 1000-1200 r / min, and the mixture is kept warm and stirred for 30-40 minutes, then cooled to room temperature and filtered. After filtration, the mixture is rinsed with deionized water 3-5 times and then dried at a temperature of 70-80°C for 20-30 minutes.

10. The method for preparing a high-strength, anti-aging PVC-U drainage pipe according to claim 1, characterized in that: The mass ratio of the composite particles to the PVC particles in the step 4 is 1:7-9; the composite particles and the PVC particles are mixed and crushed before mixing and passed through a 300-mesh sieve for standby use; the mixing temperature of the crushed composite particles and the PVC particles is 130-150° C., the mixing stirring speed is 200-300 r / min, the mixing time is 20-30 min, and ultraviolet light is used for irradiation during the mixing process, and the ultraviolet light irradiation intensity is 40-50 MeV. After mixing, the mixture is transferred to a twin-screw extruder, the inlet temperature of the twin-screw extruder is 130-140° C., the outlet temperature of the twin-screw extruder is 90-100° C., and the cooling method for extrusion cooling and shaping is water cooling.

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