CN113462028A - Nano antibacterial agent for plastics and preparation method thereof - Google Patents
Nano antibacterial agent for plastics and preparation method thereof Download PDFInfo
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- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Abstract
The invention discloses a nano antibacterial agent for plastics, and particularly relates to the technical field of plastic processing, which comprises the following raw materials: silver-loaded titanium dioxide, modified nano zinc oxide, antibacterial liquid, a coupling agent, zeolite powder, silver chloride and basic amino acid. According to the invention, silver ions are loaded on titanium dioxide, the quaternary ammonium salt solution is used for modifying nano zinc oxide, the silver-loaded titanium dioxide and the modified nano zinc oxide are embedded into zeolite powder with nano holes, so that silver ions can be prevented from being separated out from water, the reduction of the antibacterial property of the plastic is slowed down, the silver-loaded titanium dioxide can enhance the photocatalytic antibacterial effect of the plastic, the integral antibacterial effect of the plastic is better, the antibacterial effect of the plastic is better by using the quaternary ammonium salt to contain the nano zinc oxide for modification, and the dispersing effect of the nano antibacterial agent in the plastic particles is better while the antibacterial property of the plastic is improved by adding silver chloride and basic amino acid.
Description
Technical Field
The invention relates to the technical field of plastic processing, in particular to a nano antibacterial agent for plastics and a preparation method thereof.
Background
The plastic is a plastic (flexible) material formed by processing and molding or a rigid material formed by curing and crosslinking by using a high molecular weight synthetic resin as a main component and adding appropriate additives such as a plasticizer, a stabilizer, an antioxidant, a flame retardant, a colorant and the like. Many plastic materials have very limited applications because they either do not have the desired physical properties or have very poor processability, and processing aids are used to enhance the melt processability of the plastic, increase production, reduce down time and provide better product quality. In particular to daily plastic products which are frequently contacted and used, such as antibacterial toothbrushes, antibacterial plastic chopping boards, antibacterial slippers, baby nipples and high-grade indoor coatings. People have higher requirements on the closely contacted daily plastic products, and the products are nontoxic and antibacterial and have beautiful and durable appearance. The simple substance silver has the characteristics of broad-spectrum and efficient sterilization capability, durability and no decomposition, and is an antibacterial agent with a very good effect. In the development of current social science and technology, nanotechnology is gradually mature, and the specific surface area of nano silver is greatly improved compared with that of simple substance silver, surface atoms account for a larger proportion, and the bactericidal activity is also greatly improved, so that the nano silver is used as the first choice of the antibacterial agent in the daily antibacterial plastic products.
The existing nano antibacterial agent for plastics mostly adopts nano silver as an antibacterial material, silver ions are easy to separate out when the nano antibacterial agent is contacted with water in the using process, so that the antibacterial property of the plastics is poor, and the nano silver is independently used as the antibacterial material, so that the antibacterial property of the plastics is insufficient, and the using requirements of people cannot be met.
Disclosure of Invention
In order to overcome the above defects in the prior art, embodiments of the present invention provide a nano antibacterial agent for plastics and a preparation method thereof, and the problems to be solved by the present invention are: how to utilize nano-antibacterial and improve the antibacterial property of plastics and slow down the reduction of the antibacterial property of plastics.
In order to achieve the purpose, the invention provides the following technical scheme: a nano antibacterial agent for plastics comprises the following raw materials in parts by weight: 40-60 parts of silver-loaded titanium dioxide, 40-50 parts of modified nano zinc oxide, 20-30 parts of antibacterial liquid, 2-6 parts of coupling agent, 60-80 parts of zeolite powder, 20-30 parts of silver chloride and 1-5 parts of basic amino acid.
In a preferred embodiment, the feed comprises the following raw materials in parts by weight: 45-55 parts of silver-loaded titanium dioxide, 43-47 parts of modified nano zinc oxide, 23-27 parts of antibacterial liquid, 3-5 parts of coupling agent, 65-75 parts of zeolite powder, 23-27 parts of silver chloride and 2-4 parts of basic amino acid.
In a preferred embodiment, the feed comprises the following raw materials in parts by weight: 50 parts of silver-loaded titanium dioxide, 45 parts of modified nano zinc oxide, 25 parts of antibacterial liquid, 4 parts of coupling agent, 70 parts of zeolite powder, 25 parts of silver chloride and 3 parts of basic amino acid.
In a preferred embodiment, the antibacterial liquid comprises the following raw materials in parts by weight: 10-20 parts of honeysuckle, 10-20 parts of radix scutellariae, 5-15 parts of radix angelicae, 10-20 parts of fructus forsythiae, 5-10 parts of folium isatidis, 10-20 parts of wild chrysanthemum, 10-20 parts of pericarpium citri reticulatae, 8-12 parts of purslane, 5-15 parts of negundo chastetree and 10-20 parts of liquorice.
In a preferred embodiment, the coupling agent is a silane coupling agent, the basic amino acid is one or more of lysine, arginine, histidine and tryptophan, and the particle size of the zeolite powder is 50-100 nm.
The invention also provides a preparation method of the nano antibacterial agent for plastics, which comprises the following specific steps:
the method comprises the following steps: preparing silver-loaded titanium dioxide, namely weighing a certain amount of nano titanium dioxide, adding the nano titanium dioxide into a silver nitrate aqueous solution, heating to 65-75 ℃, and performing rotary evaporation and calcination to obtain the silver-loaded titanium dioxide for later use;
step two: preparing modified nano zinc oxide, weighing nano zinc oxide particles, adding the nano zinc oxide particles into a reaction container, adding ethanol, water and a coupling agent into the reaction container, uniformly mixing, performing ultrasonic dispersion at 35-45 ℃ to obtain a dispersion liquid, performing reflux reaction on the dispersion liquid for 10-20 hours to obtain active nano zinc oxide, adding a sodium dodecyl sulfate dispersing agent and water into the active nano zinc oxide, performing ultrasonic stirring dispersion, adding a quaternary ammonium salt solution after the dispersion is finished, uniformly stirring and mixing, and performing rotary evaporation and calcination to obtain the modified nano zinc oxide for later use;
step three: preparing an antibacterial solution, weighing honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, mixing and crushing the weighed honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, adding water for decocting twice, filtering and collecting a decoction after the decoction is finished, so as to obtain the antibacterial solution for later use;
step four: uniformly mixing the silver-loaded titanium dioxide obtained in the step one, the modified nano zinc oxide obtained in the step two, a coupling agent, zeolite powder, silver chloride and basic amino acid, centrifugally separating at the speed of 3000-4000r/min for 10-15min, taking the lower layer precipitate, baking in an oven at the temperature of 350-400 ℃, and grinding and sieving to obtain solid particles after baking;
step five: and (3) soaking the solid particles obtained in the fourth step in an antibacterial solution, heating to 50-70 ℃, soaking for 6-10h, and drying in an oven after complete soaking to ensure that the water content of the solid particles is 15-30% to obtain the nano antibacterial agent for plastics.
In a preferred embodiment, the silver loading of the titanium dioxide in the first step is 1-2% of the mass of the titanium dioxide, and the calcination temperature in the first step is 400-600 ℃.
In a preferred embodiment, the frequency of ultrasonic dispersion in the second step is 75-85Hz, the time of ultrasonic dispersion is 40-50min, and the calcination temperature in the second step is 150-170 ℃.
In a preferred embodiment, in the third step, 6-8 times of water is added in the first decoction, the decoction temperature is 80-90 ℃, the decoction time is 2-3h, and 4-6 times of water is added in the second decoction, the decoction temperature is 85-95 ℃, and the decoction time is 3-5 h.
In a preferred embodiment, the baking time of the oven in the fourth step is 3-5h, a 100-150 mesh sieve is adopted for sieving the solid particles, and the baking temperature of the oven in the fifth step is 120-160 ℃.
The invention has the technical effects and advantages that:
1. the nano antibacterial agent for plastics prepared by adopting the raw material formula of the invention is added with silver-loaded titanium dioxide, modified nano zinc oxide, zeolite powder, silver chloride and basic amino acid, silver ions are loaded on the titanium dioxide, and the quaternary ammonium salt solution is used for modifying the nano zinc oxide, the silver-carrying titanium dioxide and the modified nano zinc oxide are embedded into the zeolite powder with nano holes, can prevent silver ions from being separated out from water, slow down the reduction of the antibacterial property of the plastic, and the silver-loaded titanium dioxide can enhance the photocatalytic antibacterial effect of the plastic so that the overall antibacterial effect of the plastic is better, the antibacterial effect of the plastic is better by utilizing the modification of the quaternary ammonium salt and the nano zinc oxide, and the dispersion effect of the nano antibacterial agent in plastic particles can be better while the antibacterial performance of the plastic is improved by adding the silver chloride and the basic amino acid;
2. according to the invention, the antibacterial liquid is prepared by decocting and extracting honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, pericarpium citri reticulatae, purslane, negundo chastetree fruit and liquorice, and the nano-particles are soaked by utilizing the antibacterial performance of various plant extracting solutions, so that the antibacterial effect of the nano-antibacterial agent is better, the common bacterial flora in life can be effectively inhibited, and the life quality of people is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a nano antibacterial agent for plastics, which comprises the following raw materials in parts by weight: 40 parts of silver-loaded titanium dioxide, 40 parts of modified nano zinc oxide, 20 parts of antibacterial liquid, 2 parts of coupling agent, 60 parts of zeolite powder, 20 parts of silver chloride and 2 parts of basic amino acid.
In a preferred embodiment, the antibacterial liquid comprises the following raw materials in parts by weight: 15 parts of honeysuckle, 15 parts of radix scutellariae, 10 parts of radix angelicae, 15 parts of fructus forsythiae, 8 parts of folium isatidis, 15 parts of wild chrysanthemum flower, 15 parts of pericarpium citri reticulatae, 10 parts of purslane, 10 parts of negundo chastetree and 15 parts of liquorice.
In a preferred embodiment, the coupling agent is a silane coupling agent, the basic amino acid is one or more of lysine, arginine, histidine and tryptophan, and the particle size of the zeolite powder is 50-100 nm.
The invention also provides a preparation method of the nano antibacterial agent for plastics, which comprises the following specific steps:
the method comprises the following steps: preparing silver-loaded titanium dioxide, namely weighing a certain amount of nano titanium dioxide, adding the nano titanium dioxide into a silver nitrate aqueous solution, heating to 70 ℃, and performing rotary evaporation and calcination to obtain the silver-loaded titanium dioxide for later use;
step two: preparing modified nano zinc oxide, weighing nano zinc oxide particles, adding the nano zinc oxide particles into a reaction container, adding ethanol, water and a coupling agent into the reaction container, uniformly mixing, performing ultrasonic dispersion at 40 ℃ to obtain a dispersion liquid, performing reflux reaction on the dispersion liquid for 15 hours to obtain active nano zinc oxide, adding a sodium dodecyl sulfate dispersing agent and water into the active nano zinc oxide, performing ultrasonic stirring and dispersion, adding a quaternary ammonium salt solution after the dispersion is finished, uniformly stirring and mixing, and performing rotary evaporation and calcination to obtain the modified nano zinc oxide for later use;
step three: preparing an antibacterial solution, weighing honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, mixing and crushing the weighed honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, adding water for decocting twice, filtering and collecting a decoction after the decoction is finished, so as to obtain the antibacterial solution for later use;
step four: uniformly mixing the silver-loaded titanium dioxide obtained in the step one, the modified nano zinc oxide obtained in the step two, a coupling agent, zeolite powder, silver chloride and basic amino acid, centrifugally separating at a speed of 3500r/min for 13min, taking the lower layer precipitate, baking in an oven at 380 ℃, grinding and sieving after baking to obtain solid particles;
step five: and (3) soaking the solid particles obtained in the fourth step in an antibacterial solution, heating to 60 ℃, soaking for 8 hours, and drying in an oven after complete soaking to obtain the nano antibacterial agent for plastics when the water content of the solid particles is 23%.
In a preferred embodiment, the silver loading of the titanium dioxide in the first step is 1.5% by mass of the titanium dioxide, and the calcination temperature in the first step is 500 ℃.
In a preferred embodiment, the frequency of ultrasonic dispersion in the second step is 80Hz, the time of ultrasonic dispersion is 45min, and the calcination temperature in the second step is 160 ℃.
In a preferred embodiment, in the third step, water is added for the first decoction by 7 times, the decoction temperature is 85 ℃, the decoction time is 2.5 hours, and water is added for the second decoction by 5 times, the decoction temperature is 90 ℃, and the decoction time is 4 hours.
In a preferred embodiment, the oven baking time in the fourth step is 4 hours, a 120-mesh sieve is adopted for sieving the solid particles, and the baking temperature of the oven in the fifth step is 140 ℃.
Example 2:
different from the embodiment 1, the invention provides a nano antibacterial agent for plastics, which comprises 50 parts of silver-loaded titanium dioxide, 45 parts of modified nano zinc oxide, 25 parts of antibacterial liquid, 4 parts of coupling agent, 70 parts of zeolite powder, 25 parts of silver chloride and 3 parts of basic amino acid.
Example 3:
different from the embodiments 1-2, the invention provides a nano antibacterial agent for plastics, which comprises the following raw materials in parts by weight: 60 parts of silver-loaded titanium dioxide, 50 parts of modified nano zinc oxide, 30 parts of antibacterial liquid, 6 parts of coupling agent, 80 parts of zeolite powder, 30 parts of silver chloride and 4 parts of basic amino acid.
Example 4:
the invention provides a nano antibacterial agent for plastics, which comprises the following raw materials in parts by weight: 50 parts of silver-loaded titanium dioxide, 45 parts of modified nano zinc oxide, 25 parts of antibacterial liquid, 4 parts of coupling agent, 70 parts of zeolite powder, 25 parts of silver chloride and 3 parts of basic amino acid.
In a preferred embodiment, the antibacterial liquid comprises the following raw materials in parts by weight: 10 parts of honeysuckle, 10 parts of radix scutellariae, 10 parts of radix angelicae, 10 parts of fructus forsythiae, 8 parts of folium isatidis, 13 parts of wild chrysanthemum flower, 10 parts of pericarpium citri reticulatae, 10 parts of purslane, 8 parts of negundo chastetree and 10 parts of liquorice.
In a preferred embodiment, the coupling agent is a silane coupling agent, the basic amino acid is one or more of lysine, arginine, histidine and tryptophan, and the particle size of the zeolite powder is 50-100 nm.
The invention also provides a preparation method of the nano antibacterial agent for plastics, which comprises the following specific steps:
the method comprises the following steps: preparing silver-loaded titanium dioxide, namely weighing a certain amount of nano titanium dioxide, adding the nano titanium dioxide into a silver nitrate aqueous solution, heating to 70 ℃, and performing rotary evaporation and calcination to obtain the silver-loaded titanium dioxide for later use;
step two: preparing modified nano zinc oxide, weighing nano zinc oxide particles, adding the nano zinc oxide particles into a reaction container, adding ethanol, water and a coupling agent into the reaction container, uniformly mixing, performing ultrasonic dispersion at 40 ℃ to obtain a dispersion liquid, performing reflux reaction on the dispersion liquid for 15 hours to obtain active nano zinc oxide, adding a sodium dodecyl sulfate dispersing agent and water into the active nano zinc oxide, performing ultrasonic stirring and dispersion, adding a quaternary ammonium salt solution after the dispersion is finished, uniformly stirring and mixing, and performing rotary evaporation and calcination to obtain the modified nano zinc oxide for later use;
step three: preparing an antibacterial solution, weighing honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, mixing and crushing the weighed honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, adding water for decocting twice, filtering and collecting a decoction after the decoction is finished, so as to obtain the antibacterial solution for later use;
step four: uniformly mixing the silver-loaded titanium dioxide obtained in the step one, the modified nano zinc oxide obtained in the step two, a coupling agent, zeolite powder, silver chloride and basic amino acid, centrifugally separating at a speed of 3500r/min for 13min, taking the lower layer precipitate, baking in an oven at 380 ℃, grinding and sieving after baking to obtain solid particles;
step five: and (3) soaking the solid particles obtained in the fourth step in an antibacterial solution, heating to 60 ℃, soaking for 8 hours, and drying in an oven after complete soaking to obtain the nano antibacterial agent for plastics when the water content of the solid particles is 23%.
In a preferred embodiment, the silver loading of the titanium dioxide in the first step is 1.5% by mass of the titanium dioxide, and the calcination temperature in the first step is 500 ℃.
In a preferred embodiment, the frequency of ultrasonic dispersion in the second step is 80Hz, the time of ultrasonic dispersion is 45min, and the calcination temperature in the second step is 160 ℃.
In a preferred embodiment, in the third step, water is added for the first decoction by 7 times, the decoction temperature is 85 ℃, the decoction time is 2.5 hours, and water is added for the second decoction by 5 times, the decoction temperature is 90 ℃, and the decoction time is 4 hours.
In a preferred embodiment, the oven baking time in the fourth step is 4 hours, a 120-mesh sieve is adopted for sieving the solid particles, and the baking temperature of the oven in the fifth step is 140 ℃.
Example 5:
different from the embodiment 4, the nano antibacterial agent for the plastic comprises the following raw materials in parts by weight: 20 parts of honeysuckle, 20 parts of radix scutellariae, 10 parts of radix angelicae, 20 parts of fructus forsythiae, 10 parts of folium isatidis, 20 parts of wild chrysanthemum flower, 20 parts of pericarpium citri reticulatae, 10 parts of purslane, 12 parts of negundo chastetree and 20 parts of liquorice.
The nano antibacterial agents for plastics prepared in the above examples 1 to 5 were respectively used as an experimental group 1, an experimental group 2, an experimental group 3, an experimental group 4 and an experimental group 5, and the selected plastic additives were added to ABS slices to produce ABS plastics, the ABS plastics directly produced from ABS slices were selected as a control group, and then the ABS plastics produced in the experimental group and the control group were subjected to antibacterial ratio (%) detection, during which the ABS plastics just produced were subjected to antibacterial ratio detection, and then the selected ABS plastics were subjected to antibacterial ratio detection after being soaked in water for 20 days, with the test results being as shown in table one:
watch 1
As can be seen from the table I, compared with the ABS plastic produced by directly slicing ABS, the ABS plastic produced by the nano antibacterial agent for plastic of the invention has higher antibacterial rate, and the ABS plastic produced by the invention has less reduction of antibacterial rate after being soaked in water for the same time, the example 4 and the example 5 change the proportion of antibacterial liquid, the ABS plastic produced by the preparation of the antibacterial liquid in the example 5 has better antibacterial property, silver-loaded titanium dioxide, modified nano zinc oxide, zeolite powder, silver chloride and basic amino acid are added, silver ions are loaded on titanium dioxide, the nano zinc oxide is modified by quaternary ammonium salt solution, the silver-loaded titanium dioxide and the modified nano zinc oxide are embedded into zeolite powder with nano holes, the silver ions can be prevented from being separated out of water, the reduction of the antibacterial property of plastic is slowed down, the silver-loaded titanium dioxide can enhance the photocatalytic antibacterial effect of plastic, so that the overall antibacterial effect of plastic is better, the antibacterial effect of the plastic is better by utilizing the modification of the quaternary ammonium salt and the nano zinc oxide, the dispersing effect of the nano antibacterial agent in plastic particles can be better by adding the silver chloride and the basic amino acid, the antibacterial performance of the plastic is improved, and meanwhile, the antibacterial liquid is prepared by decocting and extracting honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. A nano antibacterial agent for plastics is characterized in that: the feed comprises the following raw materials in parts by weight: 40-60 parts of silver-loaded titanium dioxide, 40-50 parts of modified nano zinc oxide, 20-30 parts of antibacterial liquid, 2-6 parts of coupling agent, 60-80 parts of zeolite powder, 20-30 parts of silver chloride and 1-5 parts of basic amino acid.
2. The nano antimicrobial agent for plastics according to claim 1, wherein: the feed comprises the following raw materials in parts by weight: 45-55 parts of silver-loaded titanium dioxide, 43-47 parts of modified nano zinc oxide, 23-27 parts of antibacterial liquid, 3-5 parts of coupling agent, 65-75 parts of zeolite powder, 23-27 parts of silver chloride and 2-4 parts of basic amino acid.
3. The nano antimicrobial agent for plastics according to claim 1, wherein: the feed comprises the following raw materials in parts by weight: 50 parts of silver-loaded titanium dioxide, 45 parts of modified nano zinc oxide, 25 parts of antibacterial liquid, 4 parts of coupling agent, 70 parts of zeolite powder, 25 parts of silver chloride and 3 parts of basic amino acid.
4. The nano antimicrobial agent for plastics according to claim 1, wherein: the antibacterial liquid comprises the following raw materials in parts by weight: 10-20 parts of honeysuckle, 10-20 parts of radix scutellariae, 5-15 parts of radix angelicae, 10-20 parts of fructus forsythiae, 5-10 parts of folium isatidis, 10-20 parts of wild chrysanthemum, 10-20 parts of pericarpium citri reticulatae, 8-12 parts of purslane, 5-15 parts of negundo chastetree and 10-20 parts of liquorice.
5. The nano antimicrobial agent for plastics according to claim 1, wherein: the coupling agent is a silane coupling agent, the basic amino acid is one or more of lysine, arginine, histidine and tryptophan, and the particle size of the zeolite powder is 50-100 nm.
6. The method for preparing nano antibacterial agent for plastics according to any one of claims 1 to 5, characterized in that: the preparation method comprises the following specific steps:
the method comprises the following steps: preparing silver-loaded titanium dioxide, namely weighing a certain amount of nano titanium dioxide, adding the nano titanium dioxide into a silver nitrate aqueous solution, heating to 65-75 ℃, and performing rotary evaporation and calcination to obtain the silver-loaded titanium dioxide for later use;
step two: preparing modified nano zinc oxide, weighing nano zinc oxide particles, adding the nano zinc oxide particles into a reaction container, adding ethanol, water and a coupling agent into the reaction container, uniformly mixing, performing ultrasonic dispersion at 35-45 ℃ to obtain a dispersion liquid, performing reflux reaction on the dispersion liquid for 10-20 hours to obtain active nano zinc oxide, adding a sodium dodecyl sulfate dispersing agent and water into the active nano zinc oxide, performing ultrasonic stirring dispersion, adding a quaternary ammonium salt solution after the dispersion is finished, uniformly stirring and mixing, and performing rotary evaporation and calcination to obtain the modified nano zinc oxide for later use;
step three: preparing an antibacterial solution, weighing honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, mixing and crushing the weighed honeysuckle, radix scutellariae, radix angelicae, fructus forsythiae, folium isatidis, wild chrysanthemum, dried orange peel, purslane, negundo chastetree and liquorice, adding water for decocting twice, filtering and collecting a decoction after the decoction is finished, so as to obtain the antibacterial solution for later use;
step four: uniformly mixing the silver-loaded titanium dioxide obtained in the step one, the modified nano zinc oxide obtained in the step two, a coupling agent, zeolite powder, silver chloride and basic amino acid, centrifugally separating at the speed of 3000-4000r/min for 10-15min, taking the lower layer precipitate, baking in an oven at the temperature of 350-400 ℃, and grinding and sieving to obtain solid particles after baking;
step five: and (3) soaking the solid particles obtained in the fourth step in an antibacterial solution, heating to 50-70 ℃, soaking for 6-10h, and drying in an oven after complete soaking to ensure that the water content of the solid particles is 15-30% to obtain the nano antibacterial agent for plastics.
7. The method for preparing nano antibacterial agent for plastics as claimed in claim 6, wherein: the silver loading amount of the titanium dioxide in the first step is 1-2% of the mass of the titanium dioxide, and the calcining temperature in the first step is 400-600 ℃.
8. The method for preparing nano antibacterial agent for plastics as claimed in claim 6, wherein: the frequency of ultrasonic dispersion in the second step is 75-85Hz, the time of ultrasonic dispersion is 40-50min, and the calcination temperature in the second step is 150-170 ℃.
9. The method for preparing nano antibacterial agent for plastics as claimed in claim 6, wherein: in the third step, 6-8 times of water is added in the first decoction, the decoction temperature is 80-90 ℃, the decoction time is 2-3h, 4-6 times of water is added in the second decoction, the decoction temperature is 85-95 ℃, and the decoction time is 3-5 h.
10. The method for preparing nano antibacterial agent for plastics as claimed in claim 6, wherein: the baking time of the baking oven in the fourth step is 3-5h, a 100-fold 150-mesh sieve is adopted for sieving the solid particles, and the baking temperature of the baking oven in the fifth step is 120-fold 160 ℃.
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