CN110922663A - Antibacterial PE water supply pipe and processing technology - Google Patents
Antibacterial PE water supply pipe and processing technology Download PDFInfo
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Abstract
The invention relates to the technical field of water supply pipes, in particular to an antibacterial PE water supply pipe and a processing technology, wherein the antibacterial PE water supply pipe is prepared from the following raw materials in parts by weight: 60-80 parts of PE100 grade raw material, 20-30 parts of modified polyvinyl chloride, 5-10 parts of nano zinc oxide, 4-8 parts of silver-loaded chitosan particles, 3-6 parts of nano activated alumina, 2-4 parts of antioxidant, 1-3 parts of lubricant, 2-5 parts of dispersant, 1-3 parts of silane coupling agent and 0.5-1 part of ultraviolet-proof agent. The processing technology comprises the following steps: mixing raw materials, granulating and tubing. The PE water supply pipe has good antibacterial performance, the antibacterial efficiency is as high as more than 99%, the antibacterial period is long, and meanwhile, the PE water supply pipe has high strength and toughness and excellent ageing resistance.
Description
Technical Field
The invention relates to the technical field of water supply pipes, in particular to an antibacterial PE water supply pipe and a processing technology thereof.
Background
Polyethylene (PE) is a thermoplastic resin prepared by polymerizing ethylene, and industrially also comprises a copolymer of ethylene and a small amount of α -olefin, and the polyethylene is odorless, nontoxic, has a wax-like hand feeling, has excellent low-temperature resistance (the lowest use temperature can reach-100 to-70 ℃), good chemical stability, can resist corrosion of most of acid and alkali (cannot resist acid with oxidation property), is insoluble in common solvents at normal temperature, and has small water absorption and excellent electrical insulation.
The PE pipe is mainly used for conveying gaseous artificial gas, natural gas and liquefied petroleum, and has the advantages of pollution discharge and simple construction process. The PE pipe has the advantages of high strength, high temperature resistance, corrosion resistance, no toxicity, wear resistance and certain flexibility. The molecules of polyethylene are long-chain linear structures or branched structures, and are typically crystalline polymers. In the solid state, the crystalline portion coexists with the amorphous form. The crystallinity varies depending on the processing conditions and the original processing conditions, and generally, the higher the density, the higher the crystallinity, the crystallinity of LDPE being generally from 55 to 65% and the crystallinity of HDPE from 80 to 90%. Polyethylene is a typical thermoplastic plastic, and is popularized and used due to the characteristics of no toxicity, no odor and no odor. However, in some severe environments, bacteria often grow inside and outside the pipe in the use process.
In some existing production processes, some auxiliary agents such as antibacterial agents, ultraviolet-proof agents or anti-agents and the like are added in the processing process of synthetic materials to delay the aging and improve the antibacterial property of the synthetic materials, but the use requirements cannot be met.
Based on this, Chinese patent 200410037200.0 provides a preparation method of an antibacterial PVC-U water supply pipe, which comprises the steps of material mixing, extrusion by a double-screw extruder, vacuum cooling sizing, fixed-length cutting, flaring forming, inspection, packaging and warehousing. It contains 200 to 220 parts of PVC-U resin, 1.5 to 2.6 parts of silver antibacterial agent, 5 to 12 parts of filler, 0.6 to 1.2 parts of heat stabilizer, 2.8 to 5.0 parts of lubricant and 0.3 to 0.65 part of colorant. The PVC-U antibacterial pipe produced by the method has excellent physical and mechanical properties and antibacterial performance, the antibacterial rate reaches more than 98%, and the water delivery can be ensured while the bacterial reproduction is inhibited, so that the secondary pollution of a water body is avoided; and no equipment is added, so that the cost is low. However, the effect of the antibacterial agent is not satisfactory when the antibacterial agent is simply applied directly to a polyethylene pipe, and the antibacterial effect needs to be further improved.
In view of the above, the invention provides an antibacterial PE water supply pipe and a processing technology thereof, so as to solve the problems in the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an antibacterial PE water supply pipe and a processing technology, the antibacterial PE water supply pipe has good antibacterial performance, the antibacterial efficiency is as high as more than 99%, the antibacterial period is long, and meanwhile, the antibacterial PE water supply pipe has high strength and toughness and excellent anti-aging performance.
In order to achieve the above object, the present invention provides the following technical solutions:
in a first aspect, the invention provides an antibacterial PE water supply pipe, which is prepared from the following raw materials in parts by weight:
60-80 parts of PE100 grade raw material, 20-30 parts of modified polyvinyl chloride, 5-10 parts of nano zinc oxide, 4-8 parts of silver-loaded chitosan particles, 3-6 parts of nano activated alumina, 2-4 parts of antioxidant, 1-3 parts of lubricant, 2-5 parts of dispersant, 1-3 parts of silane coupling agent and 0.5-1 part of ultraviolet-proof agent.
In a further embodiment of the invention, the antibacterial PE water supply pipe is prepared from the following raw materials in parts by weight:
70 parts of PE100 grade raw material, 25 parts of modified polyvinyl chloride, 7.5 parts of nano zinc oxide, 6 parts of silver-loaded chitosan particles, 4.5 parts of nano active alumina, 3 parts of antioxidant, 2 parts of lubricant, 3.5 parts of dispersant, 2 parts of silane coupling agent and 0.8 part of ultraviolet-proof agent.
In a further embodiment of the present invention, the preparation method of the modified polyvinyl chloride comprises: firstly heating polyvinyl chloride to 92-98 ℃, then adding N-cyclohexyl maleic anhydride accounting for 5% of the polyvinyl chloride by mass, stirring at the rotating speed of 600rpm for 30-40min, finally adding silver powder accounting for 2% of the polyvinyl chloride by mass, stirring uniformly, stirring at the rotating speed of 600rpm for 50min in a corona field with the air relative humidity of 40% and the field intensity of 180kv/m, and standing for 20-30min to obtain the modified polyvinyl chloride.
In a further embodiment of the present invention, the preparation method of the silver-loaded chitosan particles comprises:
(1) placing chitosan in acetic acid water solution, carrying out ultrasonic stirring and stirring, and then carrying out high-speed stirring until the chitosan is completely dissolved;
(2) under ultrasonic stirring, dropwise adding a silver nitrate aqueous solution into the chitosan solution obtained in the step (1), uniformly stirring after dropwise adding, and then carrying out reduced pressure distillation to remove acetic acid and water;
(3) and (3) feeding the product obtained in the step (2) into a granulator for granulation to obtain the silver-loaded chitosan particles.
In a further embodiment of the invention, the antioxidant is a mixture of a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 3:1, the lubricant is ethylene bis stearamide, and the dispersant is polyethylene wax.
In a further embodiment of the invention, the UV protection agent is one of UV-P, UV-0.
In a second aspect, the invention further provides a processing technology of the antibacterial PE water supply pipe, which comprises the following steps:
(1) mixing raw materials: firstly, putting a PE 100-grade raw material into a high-speed mixing machine, stirring at a high speed, wherein the temperature reaches 110-;
(2) and (3) granulation: feeding the mixed materials into a granulator for granulation, and controlling the temperature of a charging barrel of the granulator to be 180-200 ℃ to obtain granules;
(3) pipe making: and cooling the granules, putting the granules into a charging barrel, controlling the temperature of the charging barrel to be 190-210 ℃ and the extrusion pressure to be 45MPa, extruding the materials out of an antibacterial PE water supply pipe through a die orifice of an extruder, and performing spray cooling through a cooling water tank to obtain a finished product.
Compared with the prior art, the invention has the following beneficial effects:
(1) the PE water supply pipe has good synergistic effect among the components, has good antibacterial performance, the antibacterial efficiency is as high as more than 99%, the antibacterial period is long, when the PE water supply pipe is used on a water supply pipeline, the bacterial reproduction can be inhibited while the water supply is ensured, so that the secondary pollution of a water body is avoided, and the PE water supply pipe has high strength, toughness and excellent anti-aging performance;
(2) the compatibility between the polyvinyl chloride and other components can be greatly improved by modifying the polyvinyl chloride, so that the distribution of the antibacterial materials such as nano zinc oxide, silver-loaded chitosan particles and nano active alumina in a PE water supply pipe is more uniform, the antibacterial performance of the PE water supply pipe is further improved, and the activity of a PE100 raw material is improved by heating and mixing the PE100 raw material and a silane coupling agent in a processing process, so that the dispersibility and the adhesive force of the filler in resin are improved, the compatibility between an inorganic filler and the resin is improved, the process performance is improved, and the mechanical, antibacterial and weather-resistant performances of the PE water supply pipe are improved;
(3) the added nano zinc oxide, silver-loaded chitosan particles and nano activated alumina have good antibacterial performance, have the advantages of antibacterial effect and antifungal effect, and can kill microorganisms and inhibit the propagation of the microorganisms.
Detailed Description
The present invention is further described below in conjunction with specific examples to enable those skilled in the art to better understand the present invention and to practice it, but the examples are not intended to limit the present invention.
Example 1
The antibacterial PE water supply pipe is prepared from the following raw materials in parts by weight:
60 parts of PE100 grade raw material, 20 parts of modified polyvinyl chloride, 5 parts of nano zinc oxide, 4 parts of silver-loaded chitosan particles, 3 parts of nano active alumina, 2 parts of antioxidant, 1 part of lubricant, 2 parts of dispersant, 1 part of silane coupling agent and 0.5 part of ultraviolet-proof agent.
The preparation method of the modified polyvinyl chloride comprises the following steps: firstly heating polyvinyl chloride to 92 ℃, then adding N-cyclohexyl maleic anhydride accounting for 5% of the polyvinyl chloride by mass, stirring at the rotating speed of 600rpm for 30min, finally adding silver powder accounting for 2% of the polyvinyl chloride by mass, stirring uniformly, stirring at the rotating speed of 600rpm for 50min in a corona field with the air relative humidity of 40% and the field intensity of 180kv/m, and standing for 20min to obtain the modified polyvinyl chloride.
The preparation method of the silver-loaded chitosan particles comprises the following steps:
(1) placing chitosan in acetic acid water solution, carrying out ultrasonic stirring and stirring, and then carrying out high-speed stirring until the chitosan is completely dissolved;
(2) under ultrasonic stirring, dropwise adding a silver nitrate aqueous solution into the chitosan solution obtained in the step (1), uniformly stirring after dropwise adding, and then carrying out reduced pressure distillation to remove acetic acid and water;
(3) and (3) feeding the product obtained in the step (2) into a granulator for granulation to obtain the silver-loaded chitosan particles.
The lubricant is ethylene bis stearamide, and the dispersing agent is polyethylene wax.
Wherein the ultraviolet screening agent is UV-P.
In addition, the invention also provides a processing technology of the antibacterial PE water supply pipe, which comprises the following steps:
(1) mixing raw materials: firstly, putting a PE 100-grade raw material into a high-speed mixing machine, stirring at a high speed, adding a silane coupling agent, mixing and stirring for 15min when the temperature reaches 110 ℃, then putting modified polyvinyl chloride, nano zinc oxide, silver-loaded chitosan particles, nano activated alumina, an antioxidant, a lubricant, a dispersing agent and an anti-ultraviolet agent into the high-speed mixing machine, stirring and mixing at a high speed, stirring at a temperature of 130 ℃, cooling the mixed material to 35 ℃ after stirring for 20min, and receiving the material for later use;
(2) and (3) granulation: feeding the mixed materials into a granulator for granulation, and controlling the temperature of a charging barrel of the granulator at 180 ℃ to obtain granules;
(3) pipe making: and cooling the granules, putting the granules into a charging barrel, controlling the temperature of the charging barrel to be 190 ℃ and the extrusion pressure to be 45MPa, extruding the materials out of an antibacterial PE water supply pipe through a die orifice of an extruder, and performing spray cooling through a cooling water tank to obtain a finished product.
Example 2
The antibacterial PE water supply pipe is prepared from the following raw materials in parts by weight:
80 parts of PE100 grade raw material, 30 parts of modified polyvinyl chloride, 10 parts of nano zinc oxide, 8 parts of silver-loaded chitosan particles, 6 parts of nano active alumina, 4 parts of antioxidant, 3 parts of lubricant, 5 parts of dispersant, 3 parts of silane coupling agent and 1 part of ultraviolet-proof agent.
The preparation method of the modified polyvinyl chloride comprises the following steps: firstly heating polyvinyl chloride to 98 ℃, then adding N-cyclohexyl maleic anhydride accounting for 5% of the polyvinyl chloride by mass, stirring at the rotating speed of 600rpm for 40min, finally adding silver powder accounting for 2% of the polyvinyl chloride by mass, stirring uniformly, stirring at the rotating speed of 600rpm for 50min in a corona field with the air relative humidity of 40% and the field intensity of 180kv/m, and standing for 30min to obtain the modified polyvinyl chloride.
The preparation method of the silver-loaded chitosan particles comprises the following steps:
(1) placing chitosan in acetic acid water solution, carrying out ultrasonic stirring and stirring, and then carrying out high-speed stirring until the chitosan is completely dissolved;
(2) under ultrasonic stirring, dropwise adding a silver nitrate aqueous solution into the chitosan solution obtained in the step (1), uniformly stirring after dropwise adding, and then carrying out reduced pressure distillation to remove acetic acid and water;
(3) and (3) feeding the product obtained in the step (2) into a granulator for granulation to obtain the silver-loaded chitosan particles.
The lubricant is ethylene bis stearamide, and the dispersing agent is polyethylene wax.
Wherein the ultraviolet screening agent is UV-0.
In addition, the invention also provides a processing technology of the antibacterial PE water supply pipe, which comprises the following steps:
(1) mixing raw materials: firstly, putting a PE 100-grade raw material into a high-speed mixing machine, stirring at a high speed, adding a silane coupling agent, mixing and stirring for 20min when the temperature reaches 130 ℃, then putting modified polyvinyl chloride, nano zinc oxide, silver-loaded chitosan particles, nano activated alumina, an antioxidant, a lubricant, a dispersing agent and an anti-ultraviolet agent into the high-speed mixing machine, stirring and mixing at a high speed, stirring at a temperature of 150 ℃, cooling the mixed material to 35 ℃ after stirring for 30min, and receiving the material for later use;
(2) and (3) granulation: feeding the mixed materials into a granulator for granulation, and controlling the temperature of a charging barrel of the granulator to be 200 ℃ to obtain granules;
(3) pipe making: and cooling the granules, putting the granules into a charging barrel, controlling the temperature of the charging barrel at 210 ℃ and the extrusion pressure at 45MPa, extruding the materials out of an antibacterial PE water supply pipe through a die orifice of an extruder, and performing spray cooling through a cooling water tank to obtain a finished product.
Example 3
The antibacterial PE water supply pipe is prepared from the following raw materials in parts by weight:
70 parts of PE100 grade raw material, 25 parts of modified polyvinyl chloride, 7.5 parts of nano zinc oxide, 6 parts of silver-loaded chitosan particles, 4.5 parts of nano active alumina, 3 parts of antioxidant, 2 parts of lubricant, 3.5 parts of dispersant, 2 parts of silane coupling agent and 0.8 part of ultraviolet-proof agent.
The preparation method of the modified polyvinyl chloride comprises the following steps: firstly heating polyvinyl chloride to 95 ℃, then adding N-cyclohexyl maleic anhydride accounting for 5% of the polyvinyl chloride by mass, stirring at the rotating speed of 600rpm for 35min, finally adding silver powder accounting for 2% of the polyvinyl chloride by mass, stirring uniformly, stirring at the rotating speed of 600rpm for 50min in a corona field with the air relative humidity of 40% and the field intensity of 180kv/m, and standing for 25min to obtain the modified polyvinyl chloride.
The preparation method of the silver-loaded chitosan particles comprises the following steps:
(1) placing chitosan in acetic acid water solution, carrying out ultrasonic stirring and stirring, and then carrying out high-speed stirring until the chitosan is completely dissolved;
(2) under ultrasonic stirring, dropwise adding a silver nitrate aqueous solution into the chitosan solution obtained in the step (1), uniformly stirring after dropwise adding, and then carrying out reduced pressure distillation to remove acetic acid and water;
(3) and (3) feeding the product obtained in the step (2) into a granulator for granulation to obtain the silver-loaded chitosan particles.
The lubricant is ethylene bis stearamide, and the dispersing agent is polyethylene wax.
Wherein the ultraviolet screening agent is UV-P.
In addition, the invention also provides a processing technology of the antibacterial PE water supply pipe, which comprises the following steps:
(1) mixing raw materials: firstly, putting a PE 100-grade raw material into a high-speed mixing machine, stirring at a high speed, adding a silane coupling agent, mixing and stirring for 18min, then putting modified polyvinyl chloride, nano zinc oxide, silver-loaded chitosan particles, nano activated alumina, an antioxidant, a lubricant, a dispersing agent and an anti-ultraviolet agent into the high-speed mixing machine, stirring and mixing at a high speed, stirring at a temperature of 140 ℃, cooling the mixed material to 35 ℃ after stirring for 25min, and receiving the material for later use;
(2) and (3) granulation: feeding the mixed materials into a granulator for granulation, and controlling the temperature of a charging barrel of the granulator to be 190 ℃ to obtain granules;
(3) pipe making: and cooling the granules, putting the granules into a charging barrel, controlling the temperature of the charging barrel at 200 ℃ and the extrusion pressure at 45MPa, extruding the materials out of an antibacterial PE water supply pipe through a die orifice of an extruder, and performing spray cooling through a cooling water tank to obtain a finished product.
Example 4
The antibacterial PE water supply pipe is prepared from the following raw materials in parts by weight:
65 parts of PE100 grade raw material, 22 parts of modified polyvinyl chloride, 6 parts of nano zinc oxide, 5 parts of silver-loaded chitosan particles, 4 parts of nano active alumina, 2.5 parts of antioxidant, 1.5 parts of lubricant, 3 parts of dispersant, 1.5 parts of silane coupling agent and 0.6 part of ultraviolet-proof agent.
The preparation method of the modified polyvinyl chloride comprises the following steps: firstly heating polyvinyl chloride to 94 ℃, then adding N-cyclohexyl maleic anhydride accounting for 5% of the polyvinyl chloride by mass, stirring at the rotating speed of 600rpm for 33min, finally adding silver powder accounting for 2% of the polyvinyl chloride by mass, stirring uniformly, stirring at the rotating speed of 600rpm for 50min in a corona field with the air relative humidity of 40% and the field intensity of 180kv/m, and standing for 23min to obtain the modified polyvinyl chloride.
The preparation method of the silver-loaded chitosan particles comprises the following steps:
(1) placing chitosan in acetic acid water solution, carrying out ultrasonic stirring and stirring, and then carrying out high-speed stirring until the chitosan is completely dissolved;
(2) under ultrasonic stirring, dropwise adding a silver nitrate aqueous solution into the chitosan solution obtained in the step (1), uniformly stirring after dropwise adding, and then carrying out reduced pressure distillation to remove acetic acid and water;
(3) and (3) feeding the product obtained in the step (2) into a granulator for granulation to obtain the silver-loaded chitosan particles.
The lubricant is ethylene bis stearamide, and the dispersing agent is polyethylene wax.
Wherein the ultraviolet screening agent is UV-0.
In addition, the invention also provides a processing technology of the antibacterial PE water supply pipe, which comprises the following steps:
(1) mixing raw materials: firstly, putting a PE 100-grade raw material into a high-speed mixing machine, stirring at a high speed, adding a silane coupling agent, mixing and stirring for 16min when the temperature reaches 115 ℃, then putting modified polyvinyl chloride, nano zinc oxide, silver-loaded chitosan particles, nano activated alumina, an antioxidant, a lubricant, a dispersing agent and an anti-ultraviolet agent into the high-speed mixing machine, stirring and mixing at a high speed, stirring at a temperature of 135 ℃, cooling the mixed material to 35 ℃ after stirring for 23min, and receiving the material for later use;
(2) and (3) granulation: feeding the mixed materials into a granulator for granulation, and controlling the temperature of a charging barrel of the granulator to be 185 ℃ to obtain granules;
(3) pipe making: and cooling the granules, putting the granules into a charging barrel, controlling the temperature of the charging barrel at 195 ℃ and the extrusion pressure at 45MPa, extruding the materials out of an antibacterial PE water supply pipe through a die orifice of an extruder, and performing spray cooling through a cooling water tank to obtain a finished product.
Example 5
The antibacterial PE water supply pipe is prepared from the following raw materials in parts by weight:
75 parts of PE100 grade raw material, 28 parts of modified polyvinyl chloride, 9 parts of nano zinc oxide, 7 parts of silver-loaded chitosan particles, 5 parts of nano active alumina, 3.5 parts of antioxidant, 2.5 parts of lubricant, 4 parts of dispersant, 2.5 parts of silane coupling agent and 0.8 part of ultraviolet-proof agent.
The preparation method of the modified polyvinyl chloride comprises the following steps: firstly heating polyvinyl chloride to 97 ℃, then adding N-cyclohexyl maleic anhydride accounting for 5% of the polyvinyl chloride by mass, stirring for 38min at the rotating speed of 600rpm, finally adding silver powder accounting for 2% of the polyvinyl chloride by mass, stirring uniformly, stirring for 50min at the rotating speed of 600rpm in a corona field with the air relative humidity of 40% and the field intensity of 180kv/m, and standing for 28min to obtain the modified polyvinyl chloride.
The preparation method of the silver-loaded chitosan particles comprises the following steps:
(1) placing chitosan in acetic acid water solution, carrying out ultrasonic stirring and stirring, and then carrying out high-speed stirring until the chitosan is completely dissolved;
(2) under ultrasonic stirring, dropwise adding a silver nitrate aqueous solution into the chitosan solution obtained in the step (1), uniformly stirring after dropwise adding, and then carrying out reduced pressure distillation to remove acetic acid and water;
(3) and (3) feeding the product obtained in the step (2) into a granulator for granulation to obtain the silver-loaded chitosan particles.
The lubricant is ethylene bis stearamide, and the dispersing agent is polyethylene wax.
Wherein the ultraviolet screening agent is UV-P.
In addition, the invention also provides a processing technology of the antibacterial PE water supply pipe, which comprises the following steps:
(1) mixing raw materials: firstly, putting a PE 100-grade raw material into a high-speed mixing machine, stirring at a high speed, adding a silane coupling agent, mixing and stirring for 18min when the temperature reaches 125 ℃, then putting modified polyvinyl chloride, nano zinc oxide, silver-loaded chitosan particles, nano activated alumina, an antioxidant, a lubricant, a dispersing agent and an anti-ultraviolet agent into the high-speed mixing machine, stirring and mixing at a high speed, stirring at a temperature of 145 ℃, cooling the mixed material to 35 ℃ after stirring for 27min, and receiving the material for later use;
(2) and (3) granulation: feeding the mixed materials into a granulator for granulation, and controlling the temperature of a charging barrel of the granulator to be 195 ℃ to obtain granules;
(3) pipe making: and cooling the granules, putting the granules into a charging barrel, controlling the temperature of the charging barrel to be 205 ℃ and the extrusion pressure to be 45MPa, extruding the materials out of an antibacterial PE water supply pipe through a die orifice of an extruder, and performing spray cooling through a cooling water tank to obtain a finished product.
Comparative example 1
An antibacterial PE water supply pipe was prepared according to the same composition and method as in example 3, except that: the formula does not contain nano zinc oxide, and comprises 70 parts of PE100 grade raw materials, 25 parts of modified polyvinyl chloride, 6 parts of silver-loaded chitosan particles, 4.5 parts of nano active alumina, 3 parts of antioxidant, 2 parts of lubricant, 3.5 parts of dispersant, 2 parts of silane coupling agent and 0.8 part of ultraviolet-proof agent.
Comparative example 2
An antibacterial PE water supply pipe was prepared according to the same composition and method as in example 3, except that: the formula of the silver-free chitosan particle comprises 70 parts of PE100 grade raw materials, 25 parts of modified polyvinyl chloride, 7.5 parts of nano zinc oxide, 4.5 parts of nano activated alumina, 3 parts of antioxidant, 2 parts of lubricant, 3.5 parts of dispersant, 2 parts of silane coupling agent and 0.8 part of ultraviolet-proof agent.
Comparative example 3
An antibacterial PE water supply pipe was prepared according to the same composition and method as in example 3, except that: the formula contains no nano active alumina, and comprises 70 parts of PE100 grade raw material, 25 parts of modified polyvinyl chloride, 7.5 parts of nano zinc oxide, 6 parts of silver-loaded chitosan particles, 3 parts of antioxidant, 2 parts of lubricant, 3.5 parts of dispersant, 2 parts of silane coupling agent and 0.8 part of ultraviolet-proof agent.
Comparative example 4
An antibacterial PE water supply pipe was prepared according to the same composition and method as in example 3, except that: the formula is free of silane coupling agent, and comprises 70 parts of PE100 grade raw material, 25 parts of modified polyvinyl chloride, 7.5 parts of nano zinc oxide, 6 parts of silver-loaded chitosan particles, 3 parts of antioxidant, 2 parts of lubricant, 3.5 parts of dispersant and 0.8 part of ultraviolet-proof agent.
Test examples
The antibacterial performance tests of the antibacterial PE water supply pipes prepared in examples 1-5 and the antibacterial PE water supply pipes prepared in comparative examples 1-4 were respectively carried out, and the specific test methods were as follows:
adopting a film pasting method, according to an antibacterial performance test method in QB/T2591-2003, investigating the antibacterial effect by the antibacterial rate of the antibacterial pipeline after the antibacterial pipeline is contacted with the tested bacteria for 24 hours, wherein the calculation formula of the antibacterial rate is as follows: and R is (B-C) 100%. In the formula, R is the antibacterial rate, B is the average number of bacteria recovered from the blank control sample, and C is the average number of bacteria recovered from the antibacterial pipeline.
Wherein, the test strains: escherichia coli, Bacillus subtilis and Bacillus proteus, all commercially available.
Culturing at 37 deg.C for 24 hr, and calculating antibacterial rate according to the number of colonies growing on 1.44 square meter, the results are shown in Table 1.
TABLE 1 antibacterial Property test results
| Sample name | Escherichia coli (%) | Bacillus subtilis (%) | Proteobacteria (%) |
| Example 1 | 99.7 | 99.7 | 99.5 |
| Example 2 | 99.8 | 99.9 | 99.7 |
| Example 3 | 99.9 | 99.9 | 99.8 |
| Example 4 | 99.8 | 99.8 | 99.6 |
| Example 5 | 99.7 | 99.8 | 99.5 |
| Comparative example 1 | 98.9 | 98.4 | 98.9 |
| Comparative example 2 | 98.3 | 98.1 | 98.3 |
| Comparative example 3 | 98.6 | 98.2 | 98.6 |
| Comparative example 4 | 99.1 | 98.7 | 99.2 |
It can be seen from table 1 that the PE water pipe prepared according to the present invention has a good antibacterial performance, and the antibacterial efficiency is as high as 99% or more, and it can be seen from comparative examples 1 to 4 that the antibacterial performance of the PE water pipe according to the present invention can be improved by adding nano zinc oxide, silver-loaded chitosan particles, nano activated alumina, and a silane coupling agent to the PE water pipe according to the present invention, thereby showing that the components in the PE water pipe according to the present invention have a good synergistic effect, and the antibacterial performance of the PE water pipe according to the present invention is synergistically enhanced.
In conclusion, the main innovation points of the green, environment-friendly and efficient water-based drilling fluid lubricant are as follows:
1. the PE water supply pipe has good synergistic effect among the components, has good antibacterial performance, the antibacterial efficiency is as high as more than 99%, the antibacterial period is long, when the PE water supply pipe is used on a water supply pipeline, the bacterial reproduction can be inhibited while the water supply is ensured, so that the secondary pollution of a water body is avoided, and the PE water supply pipe has high strength, toughness and excellent anti-aging performance;
2. the compatibility between the polyvinyl chloride and other components can be greatly improved by modifying the polyvinyl chloride, so that the distribution of the antibacterial materials such as nano zinc oxide, silver-loaded chitosan particles and nano active alumina in a PE water supply pipe is more uniform, the antibacterial performance of the PE water supply pipe is further improved, and the activity of a PE100 raw material is improved by heating and mixing the PE100 raw material and a silane coupling agent in a processing process, so that the dispersibility and the adhesive force of the filler in resin are improved, the compatibility between an inorganic filler and the resin is improved, the process performance is improved, and the mechanical, antibacterial and weather-resistant performances of the PE water supply pipe are improved;
3. the added nano zinc oxide, silver-loaded chitosan particles and nano activated alumina have good antibacterial performance, have the advantages of antibacterial effect and antifungal effect, and can kill microorganisms and inhibit the propagation of the microorganisms.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. The antibacterial PE water supply pipe is characterized by being prepared from the following raw materials in parts by weight:
60-80 parts of PE100 grade raw material, 20-30 parts of modified polyvinyl chloride, 5-10 parts of nano zinc oxide, 4-8 parts of silver-loaded chitosan particles, 3-6 parts of nano activated alumina, 2-4 parts of antioxidant, 1-3 parts of lubricant, 2-5 parts of dispersant, 1-3 parts of silane coupling agent and 0.5-1 part of ultraviolet-proof agent.
2. The antibacterial PE water supply pipe according to claim 1, which is prepared from the following raw materials in parts by weight:
70 parts of PE100 grade raw material, 25 parts of modified polyvinyl chloride, 7.5 parts of nano zinc oxide, 6 parts of silver-loaded chitosan particles, 4.5 parts of nano active alumina, 3 parts of antioxidant, 2 parts of lubricant, 3.5 parts of dispersant, 2 parts of silane coupling agent and 0.8 part of ultraviolet-proof agent.
3. The antibacterial PE water supply pipe according to claim 1, wherein the preparation method of the modified polyvinyl chloride comprises the following steps: firstly heating polyvinyl chloride to 92-98 ℃, then adding N-cyclohexyl maleic anhydride accounting for 5% of the polyvinyl chloride by mass, stirring at the rotating speed of 600rpm for 30-40min, finally adding silver powder accounting for 2% of the polyvinyl chloride by mass, stirring uniformly, stirring at the rotating speed of 600rpm for 50min in a corona field with the air relative humidity of 40% and the field intensity of 180kv/m, and standing for 20-30min to obtain the modified polyvinyl chloride.
4. The antibacterial PE water supply pipe according to claim 1, wherein the preparation method of the silver-loaded chitosan particles comprises the following steps:
(1) placing chitosan in acetic acid water solution, carrying out ultrasonic stirring and stirring, and then carrying out high-speed stirring until the chitosan is completely dissolved;
(2) under ultrasonic stirring, dropwise adding a silver nitrate aqueous solution into the chitosan solution obtained in the step (1), uniformly stirring after dropwise adding, and then carrying out reduced pressure distillation to remove acetic acid and water;
(3) and (3) feeding the product obtained in the step (2) into a granulator for granulation to obtain the silver-loaded chitosan particles.
5. The antibacterial PE water supply pipe according to claim 1, wherein the antioxidant is a mixture of a hindered phenol antioxidant and a phosphite antioxidant in a mass ratio of 3: 1.
6. The anti-microbial PE service pipe of claim 1 wherein said lubricant is ethylene bis stearamide.
7. The anti-microbial PE service pipe of claim 1 wherein said dispersant is polyethylene wax.
8. The pipe of claim 1, wherein the anti-UV agent is one of UV-P, UV-0.
9. The process for manufacturing the antibacterial PE water supply pipe according to any one of claims 1 to 8, which is characterized by comprising the following steps:
(1) mixing raw materials: firstly, putting a PE 100-grade raw material into a high-speed mixing machine, stirring at a high speed, wherein the temperature reaches 110-;
(2) and (3) granulation: feeding the mixed materials into a granulator for granulation, and controlling the temperature of a charging barrel of the granulator to be 180-200 ℃ to obtain granules;
(3) pipe making: and cooling the granules, putting the granules into a charging barrel, controlling the temperature of the charging barrel to be 190-210 ℃ and the extrusion pressure to be 45MPa, extruding the materials out of an antibacterial PE water supply pipe through a die orifice of an extruder, and performing spray cooling through a cooling water tank to obtain a finished product.
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| CN111925593A (en) * | 2020-08-04 | 2020-11-13 | 日丰企业集团有限公司 | Antibacterial pipe and preparation method thereof |
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Application publication date: 20200327 |