CN115044239A - Antibacterial composite material for pot, manufacturing method thereof and pot - Google Patents
Antibacterial composite material for pot, manufacturing method thereof and pot Download PDFInfo
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- CN115044239A CN115044239A CN202210758907.9A CN202210758907A CN115044239A CN 115044239 A CN115044239 A CN 115044239A CN 202210758907 A CN202210758907 A CN 202210758907A CN 115044239 A CN115044239 A CN 115044239A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/002—Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- 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 provides an antibacterial composite material for a pot, a manufacturing method thereof and the pot. The antibacterial composite material comprises a porous material and a nano antibacterial material arranged in pores of the porous material, wherein the weight ratio of the nano antibacterial material to the porous material is 1: 1-4: 1, and the nano antibacterial material comprises nano rare earth element oxide and antibacterial nano metal in the weight ratio of 1:9-9: 1. According to the invention, the nano rare earth oxide and the antibacterial nano metal are simultaneously included in the antibacterial composite material and are adsorbed in the porous material, so that the aim of non-contact type antibacterial can be achieved through terahertz waves, and the technical problems of few adaptive scenes and short antibacterial service life of the conventional antibacterial material are solved.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to an antibacterial composite material for a pot, a manufacturing method thereof and the pot.
Background
With the improvement of the quality of life, the antibacterial performance of the cookware is researched more and more. The existing antibacterial materials are mainly classified into inorganic antibacterial materials and organic antibacterial materials, wherein the inorganic antibacterial materials are classified into metal ion antibacterial and metal oxide photocatalytic antibacterial (for example, titanium dioxide), and the organic antibacterial materials include vanillin or ethyl vanillin compounds, anilides, imidazoles, thiazoles, isothiazolone derivatives, quaternary ammonium salts, biguats, phenols and the like. The most widely used antibacterial material is a metal ion antibacterial material.
However, the conventional inorganic antibacterial materials are all contact antibacterial materials, and have a problem that the antibacterial effect is weakened to disappear due to the elution of ions.
Disclosure of Invention
The present invention has been made to solve at least one of the above-mentioned problems occurring in the prior art or the related art.
Therefore, the invention provides a novel antibacterial composite material for a pot, a manufacturing method thereof and the pot, the antibacterial composite material realizes the purpose of non-contact antibacterial sterilization through terahertz waves, and solves the problems of few adaptive scenes and short antibacterial service life of the existing antibacterial material.
According to one aspect of the present invention, there is provided an antibacterial composite material for a pot, the antibacterial composite material including a porous material and a nano antibacterial material disposed in pores of the porous material, a weight ratio of the nano antibacterial material to the porous material being between 1:1 and 4:1, the nano antibacterial material including a nano rare earth element oxide and an antibacterial nanometal being in a weight ratio of between 1:9 and 9: 1. The antibacterial composite material realizes the purpose of non-contact antibacterial sterilization through terahertz waves, so that the antibacterial life is prolonged.
According to the embodiment of the present invention, the nano antibacterial material may have a particle size in a range of 25nm to 500nm, the porous material may be a material having a porosity of 80% or more and a pore size of 50nm to 800nm, and the particle size of the nano antibacterial material may be smaller than the pore size of the porous material. By further optimizing the particle size of the nano antibacterial material and the pore diameter of the porous material, the nano antibacterial material can be better adsorbed in the pores of the porous material.
According to the embodiment of the invention, the weight ratio of the nano antibacterial material to the porous material can be 2:1, and the weight ratio of the nano rare earth element oxide to the antibacterial nano metal can be 6: 4. The antibacterial performance of the antibacterial composite material can be further improved by further controlling the use amount of the nanometer rare earth element oxide, the antibacterial nanometer metal and the porous material.
According to an embodiment of the present invention, the nano rare earth element oxide may include at least one of nano lanthanum oxide, nano cerium oxide, nano praseodymium oxide, nano neodymium oxide, nano promethium oxide, nano samarium oxide, nano europium oxide, nano gadolinium oxide, nano terbium oxide, nano dysprosium oxide, nano holmium oxide, nano erbium oxide, nano thulium oxide, nano ytterbium oxide, nano lutetium oxide, nano yttrium oxide, and nano scandium oxide; the antibacterial nano metal may include at least one of nano silver, nano copper and nano zinc; the porous material may include at least one of diatomaceous earth and bentonite. The antibacterial performance of the antibacterial composite material can be further improved by controlling the components of the nanometer rare earth element oxide, the antibacterial nanometer metal and the porous material.
According to an embodiment of the present invention, the nano rare earth element oxide may include at least one of nano lanthanum oxide, nano cerium oxide, nano neodymium oxide, and nano yttrium oxide; the antibacterial nanometal may include at least one of nanosilver and nanocopper; the porous material may comprise diatomaceous earth. The antibacterial performance of the antibacterial composite material can be further improved by controlling the components of the nanometer rare earth element oxide, the antibacterial nanometer metal and the porous material.
According to another aspect of the present invention, there is provided a method of manufacturing an antibacterial composite material for a pot, the method including the steps of: mixing the nano antibacterial material with a binder, a surfactant, a defoaming agent and a solvent to obtain slurry; adding a porous material into the slurry, and stirring for a predetermined time to allow the nano antibacterial material to be adsorbed in pores of the porous material, thereby obtaining a mixed slurry; and spray drying the mixed slurry to obtain the antibacterial composite material, wherein the weight ratio of the nano antibacterial material to the porous material is 1: 1-4: 1, and the nano antibacterial material comprises nano rare earth element oxide and antibacterial nano metal in the weight ratio of 1:9-9: 1. The antibacterial composite material formed by the method can improve the antibacterial capability.
According to an embodiment of the present invention, the slurry may include 30 wt% to 45 wt% of a solvent, 20 wt% to 30 wt% of a binder, 0.5 wt% to 3 wt% of a surfactant, 0.2 wt% to 1 wt% of a defoaming agent, and the balance of a nano antibacterial material, in percentage by weight. Controlling the content of each component of the slurry within the above range enables better formation of the antibacterial composite material.
According to an embodiment of the present invention, the binder may include at least one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methylcellulose, polyvinyl alcohol, and polyallyl alcohol; the surfactant may include at least one of cetyltrimethylammonium bromide, cetyltrimethylammonium chloride, and dodecyltrimethylammonium bromide; the defoaming agent may include at least one of polyether-modified silicone oil and organic silicone oil; the solvent may comprise water. The selection of the above-mentioned binder, surfactant, defoamer and solvent enables better formation of the antimicrobial composite by spray drying.
According to the embodiment of the invention, the atomization pressure can be 0.3-0.6 MPa, and the atomization airflow flow rate is 0.5m 3 /h-5m 3 And/h, performing spray drying under the conditions that the inlet temperature is 200-600 ℃ and the outlet temperature is 50-200 ℃. Performing spray drying under this condition can improve production efficiency.
According to another aspect of the present invention, there is provided a pot including: a body having a food-bearing surface; and an antimicrobial coating disposed on a surface of the body, wherein the antimicrobial coating comprises the antimicrobial composite material as described above. The pot with the antibacterial coating comprising the antibacterial composite material has higher antibacterial capability.
The invention has the following beneficial effects:
according to the embodiment of the invention, the nano rare earth oxide and the nano metal for antibiosis are simultaneously included in the antibacterial composite material, and are adsorbed in the porous material, so that the aim of non-contact antibacterial sterilization can be achieved through the terahertz wave, and the technical problems of few adaptive scenes and short antibacterial service life of the conventional antibacterial material are solved.
Drawings
The above and/or other features and aspects of the present invention will become apparent and appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural view illustrating an antibacterial composite material according to an embodiment of the present invention.
Fig. 2 is a flow chart illustrating the manufacture of an antimicrobial composite according to an embodiment of the present invention.
Fig. 3 is a schematic view illustrating a spray-drying system used in a process of manufacturing an antibacterial composite material according to an embodiment of the present invention.
Detailed Description
Hereinafter, an antibacterial composite material for a pot and a method for manufacturing the same according to some embodiments of the present invention will be described in detail with reference to the accompanying drawings.
This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 is a schematic structural view illustrating an antibacterial composite material according to an embodiment of the present invention.
Referring to fig. 1, an antibacterial composite material 100 according to an embodiment of the present invention includes a porous material 110 and a nano antibacterial material disposed in pores of the porous material 110.
The porous material 110 may be a material having a porosity of 80% or more and a pore diameter of 50nm to 800 nm. For example, the porous material 110 may include at least one of diatomite and bentonite, and preferably, may include diatomite. Taking diatomite as an example, the diatomite has a special porous structure, the pore diameter of the diatomite is 50nm to 800nm, the porosity of the diatomite reaches more than 80 percent, the diatomite can adsorb liquid with the weight 1.5 to 4 times of the weight of the diatomite, and the diatomite is non-toxic and harmless, so that the diatomite can be used as an excellent antibacterial carrier.
In the invention, the nano antibacterial material is adsorbed in the porous material, so that the technical problem that the nano antibacterial material cannot be fully used in production possibly caused by the nano antibacterial material with the nano particle size can be solved. In addition, the nano antibacterial material is adsorbed in the porous material, so that the dissolution rate of the antibacterial metal ions in the nano antibacterial material can be reduced, namely the dissolution time of the antibacterial metal ions is prolonged, and the antibacterial service life is prolonged.
The nano-sized antibiotic material may include nano rare earth element oxide 120 and nano metal 130 for antibiotic.
The particle size of the nano antibacterial material can be in the range of 25nm to 500nm, and the particle size of the nano antibacterial material can be smaller than the pore diameter of the porous material, so that the nano antibacterial material can be adsorbed in the pores of the porous material.
The nano rare earth element oxide 120 may include at least one of nano lanthanum oxide, nano cerium oxide, nano praseodymium oxide, nano neodymium oxide, nano promethium oxide, nano samarium oxide, nano europium oxide, nano gadolinium oxide, nano terbium oxide, nano dysprosium oxide, nano holmium oxide, nano erbium oxide, nano thulium oxide, nano ytterbium oxide, nano lutetium oxide, nano yttrium oxide, and nano scandium oxide. Preferably, the nano rare earth element oxide may include at least one of nano lanthanum oxide, nano cerium oxide, nano neodymium oxide, and nano yttrium oxide.
The rare earth atoms in the nano rare earth oxide 120 have an unfilled, externally shielded 4f5d electronic configuration, and thus have abundant electronic energy levels and long-lived excited states. When the rare earth ions absorb electromagnetic waves with high external energy, particularly infrared rays, outer layer electrons can be excited to jump to a high energy level position, electron orbit transition can be carried out spontaneously due to the fact that the electron energy level is in a metastable state, terahertz electromagnetic waves with frequency lower than that of infrared light are released, and the process can be carried out repeatedly. The terahertz wave is an electromagnetic wave with the frequency within the range of 0.1THz-10THz, the wave band covers the characteristic spectrum of organisms, biological macromolecules and other substances, the terahertz electromagnetic wave can change the membrane potential and the polar molecular structure of bacteria, so that proteins and physiologically active substances in the microorganisms are mutated to lose vitality or die, and the aim of resisting bacteria is fulfilled.
The nano metal 130 for antibacterial use may include at least one of nano silver, nano copper, and nano zinc, and preferably, may include at least one of nano silver and nano copper.
The metal ions in the antibacterial nanometal 130 are firmly adsorbed on the cell membrane by the charge acting force and react with the cell wall to generate peptidoglycan, so that the inherent components of the bacteria are damaged or the production function is disturbed. Further penetrating cell wall to break cell wall and make cytoplasm outflow, and combining with some groups in body of bacteria, such as sulfhydryl (-SH), to coagulate protein, destroy activity of cell synthetase, inactivate protease, kill cell by losing division and proliferation capacity, and finally kill bacteria.
The weight ratio of the nano rare earth element oxide 120 to the nano metal for antibacterial 130 is between 1:9 and 9:1, and preferably, may be 6: 4. In the invention, the weight ratio of the nanometer rare earth element oxide to the antibacterial nanometer metal is controlled within the range, so that the nanometer rare earth element oxide and the antibacterial nanometer metal can coordinately play an antibacterial effect, thereby improving the antibacterial capability. If the weight ratio of the nano rare earth element oxide 120 to the antibacterial nano metal 130 is less than 1:9, the non-contact terahertz wave antibacterial effect is poor, so that the antibacterial scene is not comprehensive (less silver ion precipitation and poor antibacterial performance in a dry environment), and the antibacterial life is short; if the weight ratio of the nano rare earth element oxide 120 to the antibacterial nano metal 130 is greater than 9:1, the contact silver ion antibacterial effect is poor, so that the antibacterial scene is not comprehensive, and the overall antibacterial effect is poor when the ambient light source or infrared radiation is weak.
In the present invention, the weight ratio of the nano-antibacterial material to the porous material is between 1:1 and 4:1, such as 1:1 to 3.5:1, 1:1 to 3:1, 1.5:1 to 2.5:1, 1.6:1 to 2:1, 1.7:1 to 1.9:1, or any range of the values given above, such as 1.5:1 to 2: 1. In an embodiment of the present invention, preferably, the weight ratio of the nano antibacterial material to the porous material may be 2: 1. Due to the low density and light specific gravity of the porous material, the porous material can adsorb liquid or suspension much more than the self weight. If the weight ratio of the nano antibacterial material to the porous material is less than 1:1, the amount of the nano antibacterial material absorbed by the porous material is insufficient, the final antibacterial composite material has poor effect, more antibacterial composite materials are required to be added to achieve the same antibacterial effect, the product performance is affected, and the cost is wasted; if the weight ratio of the nano antibacterial material to the porous material is more than 4:1, the porous material cannot completely adsorb the nano antibacterial material, and the cost is wasted.
According to the invention, the nano rare earth oxide and the antibacterial nano metal are simultaneously included in the antibacterial composite material and are adsorbed in the porous material, so that the technical problem that the nano antibacterial material cannot be fully used in production due to the fact that the particle size of the nano antibacterial material is nano can be solved, the rate of dissolving out the antibacterial metal ions in the nano antibacterial material can be reduced by adsorbing the nano antibacterial material in the porous material, namely, the time of dissolving out the antibacterial metal ions is prolonged, the antibacterial service life is prolonged, the aim of non-contact antibacterial sterilization can be achieved through terahertz waves, and the antibacterial capability can be improved.
A method of manufacturing an antibacterial composite material for a pot according to the present invention will be described in detail with reference to fig. 2.
Referring to fig. 2, the method of manufacturing the antibacterial composite material for the pot according to the present invention includes: preparing a slurry (step S100); preparing a mixed slurry (step S200); and spray drying (step S300).
In step S100, the nano-antibacterial material is mixed with a binder, a surfactant, a defoaming agent, and a solvent to obtain a slurry. Specifically, the nanometer rare earth element oxide and the antibacterial nanometer metal are weighed according to the weight ratio of 1:9-9:1, placed in a double-motion mixer to be mixed for 60min, and then the solvent, the binder, the surfactant, the defoaming agent, the weighed nanometer rare earth element oxide and the antibacterial nanometer metal are mixed and placed in an ultrasonic mixer to be mixed for 30min to obtain slurry.
In an embodiment of the present invention, the slurry may include 30 wt% to 45 wt% of a solvent, 20 wt% to 30 wt% of a binder, 0.5 wt% to 3 wt% of a surfactant, 0.2 wt% to 1 wt% of a defoaming agent, and the balance of a nano antibacterial material (i.e., a nano rare earth element oxide and an antibacterial nano metal), in percentage by weight. In the present invention, controlling the contents of the components of the slurry within the above ranges enables better formation of the antibacterial composite material.
As an example, the binder may include at least one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, polyvinyl alcohol, and polyallyl alcohol, and preferably, may include polyvinyl alcohol.
As an example, the surfactant may include at least one of cetyltrimethylammonium bromide, cetyltrimethylammonium chloride, and dodecyltrimethylammonium bromide.
As an example, the defoaming agent may include at least one of polyether-modified silicone oil and silicone oil.
As an example, the solvent may include water.
In step S200, a porous material is added to the slurry and stirred for a predetermined time to allow the nano antibacterial material to be adsorbed in the pores of the porous material, thereby obtaining a mixed slurry. Specifically, the porous material may be added to the slurry in an amount of 1:1 to 4:1 by weight of the nano antibacterial material to the porous material, and stirred for a predetermined time to adsorb the nano antibacterial material in pores of the porous material. In this step S200, the nano antibacterial material is adsorbed in the pores of the porous material.
In step S300, the mixed slurry in which the nano antibacterial material is adsorbed in the pores of the porous material is spray-dried to obtain the antibacterial composite material. As an example, spray drying is performed under such conditions: the atomization pressure is 0.3MPa-06MPa (preferably 0.4MPa-0.5 MPa); the flow rate of the atomized air flow is 0.5m 3 /h-5m 3 H (preferably 1 m) 3 /h-3m 3 H); the inlet temperature is 200-600 deg.C (preferably 300-400 deg.C); the temperature of the air outlet is 50-200 ℃ (preferably 80-160 ℃).
During the spray drying process, if the atomization pressure is too high, the particle size of particles formed by slurry atomization is smaller, and thus the particle size of the obtained antibacterial composite material is smaller. If the atomized air flow is too small, the movement of particles is not sufficient, the uneven degree of temperature and humidity distribution in different areas is obvious, and particles with large particle size are easy to form; when the atomization airflow is too large, collision exists between particles and the wall of the drying tower, so that a relatively fine antibacterial composite material is easily generated, and the relatively fine antibacterial composite material is easily escaped from the atomization drying tower.
As an example, the flow of performing step S300 using the spray drying system will be described with reference to fig. 3.
The spray drying system 1 may include a drying tower 10 having an inlet into which an atomized air stream enters and an outlet from which a dried material flows out, a spray head 20 disposed at the inlet of the drying tower 10, an air pumping device 30 pumping air to the inlet of the drying tower 10, an air heater 40 heating the air pumped by the air pumping device 30, a slurry pumping device 50 pumping slurry to the spray head 20, an off-gas dust removing device 60 connected near the outlet of the drying tower 10, and a cyclone separator 70 disposed between the outlet of the drying tower 10 and the off-gas dust removing device 60.
Air enters the air heater 40 through the air pumping device 30, and hot air heated by the air heater 40 contacts the slurry pumped to the spray head 20 through the slurry pumping device 50 at the inlet of the drying tower 10, so that the slurry is atomized and dried in the drying tower 10, and then the granulated material is discharged from the outlet of the drying tower 10. In addition, a portion of the atomized gas stream or finer material in the drying tower 10 may enter the cyclone 70 for further separation or may be discharged through the tail gas dust collector 60.
In the embodiment of the present invention, the inlet temperature during the spray drying process may refer to a temperature when hot air enters the inlet of the drying tower 10, and the outlet temperature may refer to a temperature when the granulated material is discharged from the outlet of the drying tower 10.
In the invention, the particle size of the nano antibacterial material is obviously smaller than the pore diameter of the porous material, when the porous material absorbs solution or turbid liquid, the uniformly dispersed nano antibacterial material is absorbed in the pores of the porous material in the form of turbid liquid, when the solvent is rapidly volatilized in the form of steam during spray drying, and the solid nano antibacterial material can be blocked by a pore channel and is retained in the porous material due to extremely small particle size and electrostatic adsorption.
A pot according to an embodiment of the present invention includes: a body having a food-bearing surface and an antimicrobial coating disposed on the surface of the body, the antimicrobial coating may include an antimicrobial composite as described above.
As an example, the antibacterial composite material as described above may be sprayed to the surface of the body using a plasma spraying process. Specifically, the surface of the pot body is cleaned, and the surface is coarsened, so that the binding force between the pot body and the antibacterial coating is enhanced; plasma spraying was performed under the following conditions: the powder feeding speed is 45g/min, the spraying distance is 110mm, the arc current is 650A, the hydrogen pressure is 0.8MPa, the hydrogen flow is 100L/h, the argon pressure is 0.8MPa, and the argon flow is 2000L/h.
Hereinafter, the antibacterial composite material according to the present invention and the method for manufacturing the same will be described in detail with reference to examples and comparative examples.
Example 1
Preparing slurry: weighing nanometer lanthanum oxide (with average particle size of 30-40 nm) and nanometer metal silver powder (with average particle size of 40-45 nm) at a weight ratio of 6:4, mixing in a double-motion mixer for 60min to obtain nanometer antibacterial material; then mixing water, polyvinyl alcohol, cetyl trimethyl ammonium bromide, organic silicone oil and the nano antibacterial material in sequence according to the weight percentage, and then placing the mixture in an ultrasonic mixer for mixing for 30min to obtain slurry; wherein the slurry comprises 30 wt% of water, 30 wt% of polyvinyl alcohol, 0.5 wt% of cetyl trimethyl ammonium bromide, 1 wt% of organic silicon oil and the balance of nano antibacterial materials according to weight percentage.
Adding a diatomite material (the porosity of which is more than 80% and the pore diameter of which is within the range of 80nm to 100 nm) into the slurry, and then stirring for a certain time until the diatomite material is completely absorbed, so that the nano antibacterial material is adsorbed in the pores of the porous material, thereby obtaining mixed slurry, wherein the weight ratio of the nano antibacterial material to the diatomite material is 2: 1.
The atomization pressure is 0.6MPa, and the flow of the atomization airflow is 3m 3 And/h, performing spray drying on the mixed slurry under the conditions that the inlet temperature is 300 ℃ and the outlet temperature is 80 ℃ to obtain the antibacterial composite material with the average particle size of 20-40 mu m.
The surface of the pot body is cleaned to coarsen the surface so as to enhance the bonding force between the pot body and the antibacterial coating, and then plasma spraying is carried out under the following conditions: the powder feeding speed is 45g/min, the spraying distance is 110mm, the arc current is 650A, the hydrogen pressure is 0.8MPa, the hydrogen flow is 100L/h, the argon pressure is 0.8MPa, and the argon flow is 2000L/h.
Example 2
The pot of example 2 was manufactured in the same manner as in example 1, except that the nano lanthanum oxide and the nano metallic silver powder were in a ratio of 1:9 by weight.
Example 3
The pot of example 3 was manufactured in the same manner as in example 1, except that the nano lanthanum oxide and the nano metallic silver powder were in a ratio of 9:1 by weight.
Example 4
The pot of example 4 was manufactured in the same manner as in example 1, except that nano yttrium oxide and nano copper were used.
Example 5
The pot of example 5 was manufactured by the same method as example 1, except that bentonite (having a porosity of 80% or more and an average pore diameter in the range of 100nm to 150 nm) was used as the porous material.
Example 6
The pot of example 6 was manufactured in the same manner as in example 1, except that the weight ratio of the nano-antibacterial material to the porous material was controlled to 1: 1.
Example 7
The pot of example 7 was manufactured in the same manner as in example 1, except that the weight ratio of the nano-antibacterial material to the porous material was controlled to 4: 1.
Comparative example 1
The pot of comparative example 1 was manufactured in the same manner as in example 1, except that the nano antibacterial material included only nano lanthanum oxide.
Comparative example 2
The pot of comparative example 1 was manufactured in the same manner as in example 1, except that the nano-antibacterial material included only nano-silver.
Performance index testing
The pot obtained above was subjected to a performance test and recorded in table 1 below, and the specific performance test method was as follows:
and (3) testing antibacterial performance: the antibacterial rate was recorded with reference to the antibacterial property test in JIS Z2801: 2010.
And (3) antibacterial life test: keeping slightly boiling mixed seasoning soup (soy sauce: vinegar: cooking wine: monosodium glutamate: salt: sugar: edible oil: 4:3:2:1: 2:2 (weight ratio)), mixing, adding water to dilute to obtain 5 wt% of mixed seasoning soup, testing the antibacterial rate once every 24h, and when the antibacterial rate is less than 99%, considering that the antibacterial life reaches the end point.
TABLE 1
| Numbering | Antibacterial rate | Antibacterial life/h |
| Example 1 | 99.9999％ | 8760 |
| Example 2 | 99.998％ | 8640 |
| Example 3 | 99.997％ | 8640 |
| Example 4 | 99.9999％ | 8760 |
| Example 5 | 99.9999％ | 8760 |
| Example 6 | 99.999％ | 8664 |
| Example 7 | 99.998％ | 8664 |
| Comparative example 1 | 99.99％ | 8640 |
| Comparative example 2 | 99.99％ | 2880 |
As can be seen from table 1, examples 1 to 7 include both the nano rare earth element oxide and the nano metal for antibacterial at the same time, so that the antibacterial ratio is higher than comparative examples 1 and 2 including only one antibacterial material. In addition, by adsorbing the nano rare earth element oxide and the antibacterial nano metal in the pores of the porous material, the release rate of antibacterial ions can be extended, so that the antibacterial life is significantly longer than that of comparative examples 1 and 2.
In summary, by including the nano rare earth oxide and the nano metal for antibacterial in the antibacterial composite material and adsorbing the nano rare earth oxide and the nano metal for antibacterial in the porous material, the technical problem that the nano antibacterial material cannot be fully used in production due to the fact that the particle size of the nano antibacterial material is nano-scale can be solved, and by adsorbing the nano antibacterial material in the porous material, the rate of dissolving out the antibacterial metal ions in the nano antibacterial material can be reduced, namely the time of dissolving out the antibacterial metal ions is prolonged, so that the antibacterial life is prolonged, and the aim of non-contact antibacterial sterilization can be achieved through terahertz waves, so that the antibacterial capability can be improved.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow, and the equivalents thereof, since modifications and improvements to those embodiments (e.g., various features described in connection with different embodiments may be combined) are within the scope thereof.
Claims (10)
1. An antibacterial composite material for cookware is characterized in that the antibacterial composite material comprises a porous material and a nano antibacterial material arranged in pores of the porous material,
the weight ratio of the nano antibacterial material to the porous material is 1:1 to 4:1,
the nano antibacterial material comprises nano rare earth element oxide and antibacterial nano metal in a weight ratio of 1:9 to 9: 1.
2. The antimicrobial composite of claim 1,
the grain diameter of the nano antibacterial material is in the range of 25nm to 500nm,
the porous material has a porosity of 80% or more and a pore diameter of 50nm to 800nm, and
the particle size of the nano antibacterial material is smaller than the pore diameter of the porous material.
3. The antimicrobial composite of claim 1,
the weight ratio of the nano antibacterial material to the porous material is 2:1,
the weight ratio of the nanometer rare earth element oxide to the antibacterial nanometer metal is 6: 4.
4. The antimicrobial composite of claim 1,
the nano rare earth element oxide comprises at least one of nano lanthanum oxide, nano cerium oxide, nano praseodymium oxide, nano neodymium oxide, nano promethium oxide, nano samarium oxide, nano europium oxide, nano gadolinium oxide, nano terbium oxide, nano dysprosium oxide, nano holmium oxide, nano erbium oxide, nano thulium oxide, nano ytterbium oxide, nano lutetium oxide, nano yttrium oxide and nano scandium oxide;
the antibacterial nano metal comprises at least one of nano silver, nano copper and nano zinc;
the porous material includes at least one of diatomaceous earth and bentonite.
5. The antimicrobial composite of claim 1,
the nanometer rare earth element oxide comprises at least one of nanometer lanthanum oxide, nanometer cerium oxide, nanometer neodymium oxide and nanometer yttrium oxide;
the antibacterial nano metal comprises at least one of nano silver and nano copper;
the porous material comprises diatomaceous earth.
6. A method of manufacturing an antimicrobial composite material for cookware, the method comprising the steps of:
mixing the nano antibacterial material with a binder, a surfactant, a defoaming agent and a solvent to obtain slurry;
adding a porous material into the slurry, and stirring for a predetermined time to allow the nano antibacterial material to be adsorbed in pores of the porous material, thereby obtaining a mixed slurry; and
spray-drying the mixed slurry to obtain the antibacterial composite material,
the weight ratio of the nano antibacterial material to the porous material is 1:1 to 4:1,
the nano antibacterial material comprises nano rare earth element oxide and antibacterial nano metal in a weight ratio of 1:9 to 9: 1.
7. The method of claim 6, wherein the slurry comprises 30 wt% to 45 wt% of the solvent, 20 wt% to 30 wt% of the binder, 0.5 wt% to 3 wt% of the surfactant, 0.2 wt% to 1 wt% of the defoaming agent, and the balance of the nano antibacterial material.
8. The method of claim 6,
the binder comprises at least one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, polyvinyl alcohol and polypropylene alcohol;
the surfactant comprises at least one of cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride and dodecyl trimethyl ammonium bromide;
the defoaming agent comprises at least one of polyether modified silicone oil and organic silicone oil;
the solvent includes water.
9. The method according to claim 6, wherein the atomization pressure is 0.3MPa-0.6MPa, and the atomization gas flow rate is 0.5m 3 /h-5m 3 And/h, performing spray drying under the conditions that the inlet temperature is 200-600 ℃ and the outlet temperature is 50-200 ℃.
10. A pot, characterized in that, the pot includes:
a body having a food-bearing surface; and
an antibacterial coating layer disposed on the surface of the body,
wherein the antimicrobial coating comprises the antimicrobial composite of any one of claims 1 to 5.
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