CN106689201B - Nano silver antibacterial agent and preparation method thereof - Google Patents
Nano silver antibacterial agent and preparation method thereof Download PDFInfo
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- CN106689201B CN106689201B CN201611236763.1A CN201611236763A CN106689201B CN 106689201 B CN106689201 B CN 106689201B CN 201611236763 A CN201611236763 A CN 201611236763A CN 106689201 B CN106689201 B CN 106689201B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/14—Plasma, i.e. ionised gases
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
- A61L9/22—Ionisation
Abstract
The invention discloses a nano-silver antibacterial agent and a preparation method thereof, belonging to the technical field of antibacterial agent preparation. The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight: 0.8-1.6 parts of silver nitrate, 80-120 parts of titanium dioxide, 0.19-0.39 part of sodium hydroxide and 60-120 parts of water. The sodium hydroxide and the silver nitrate just completely react, corrosive substances cannot be generated in the reaction process, pollution-free preparation is realized, the preparation process is simple, and the cost is low; the prepared nano-silver antibacterial agent has good antibacterial effect on aspergillus niger, aspergillus terreus and the like.
Description
Technical Field
The invention relates to the technical field of antibacterial agent preparation, in particular to a nano-silver antibacterial agent and a preparation method thereof.
Background
With the acceleration of the industrialization process and the improvement of the living standard of people, most public places and families need decoration to beautify the indoor environment, and the antibacterial and mildewproof performance of the decoration material is closely related to the indoor air quality.
The organic decoration and finishing material is easy to breed mildew in humid, warm and air-tight environments due to a large amount of organic matters contained in the material. Inorganic decoration materials generally contain a small amount of organic matters, and even inorganic materials without organic matters are easy to grow mildew in humid, warm, air-tight environments and other environments due to the adhesion of organic matters and dirt and the attachment of organic matter dust. The bred mould is dispersed in the air, can seriously pollute the indoor environment, and can cause nerve and endocrine disturbance, immunosuppression, carcinogenesis, teratogenesis, liver and kidney injury, breeding disorder and the like when people contact or inhale harmful mould through skin.
The antibacterial and mildewproof needs comprehensive treatment, wherein, for the decoration and finishing materials, the most common and effective method is to add a proper amount of antibacterial agent into the materials. The inorganic antibacterial agent utilizes the antibacterial capacity of metals such as silver, copper, zinc and the like, and the metals (or ions thereof) such as silver, copper, zinc and the like are fixed on the surface of porous materials such as fluorite, silica gel and the like by methods such as physical adsorption ion exchange and the like to prepare the antibacterial agent, and then the antibacterial agent is added into corresponding products to obtain the material with the antibacterial capacity. Metals such as mercury, cadmium, lead and the like also have antibacterial capacity, but are harmful to human bodies; copper, nickel, lead and other ions have colors, which affect the appearance of the product, and zinc has certain antibacterial property, but the antibacterial strength of zinc is only 1/1000 of silver ions.
The main variety of the organic antibacterial agent is vanillin or ethyl vanillin compounds, which are commonly used in polyethylene food packaging films and play an antibacterial role. In addition, acylanilines, imidazoles, thiazoles, isothiazolone derivatives, quaternary ammonium salts, biguanidines, phenols and the like can be used. The safety of organic antibacterial agents is currently under investigation. Generally, organic antibacterial agents are inferior in heat resistance, are easily hydrolyzed, and have a short shelf life. The natural antibacterial agent is mainly extracted from natural plants, such as chitin, mustard, castor oil, horseradish, and the like, is simple and convenient to use, but has limited antibacterial action, poor heat resistance, low sterilization rate, no broad-spectrum long-acting use and small quantity.
The silver ion antibacterial agent is the most commonly used antibacterial agent, is white fine powder and has the heat-resistant temperature of over 1300 ℃. The carrier of the silver ion antibacterial agent includes glass, zirconium phosphate, zeolite, ceramic, activated carbon, and the like. Sometimes, some copper ions and zinc ions are added to improve the synergistic effect. In addition, inorganic antibacterial agents such as zinc oxide, copper oxide, ammonium dihydrogen phosphate, and lithium carbonate are also included. In the prior art, CN102205244A discloses a silver-loaded titanium dioxide antibacterial agent and a preparation method thereof, wherein carrier titanium dioxide with high length-diameter ratio is firstly prepared, and then silver particles are loaded. In the process of loading silver particles by using an excess impregnation method, the prepared titanium dioxide is added into a silver nitrate aqueous solution, and the silver-loaded titanium dioxide antibacterial agent is prepared by drying and calcining. During the preparation process, silver nitrate is decomposed into silver, nitrogen dioxide and oxygen on the surface or in the interior of titanium dioxide, but the generated nitrogen dioxide easily causes environmental pollution.
Disclosure of Invention
In order to solve the problems of organic antibacterial agents and inorganic antibacterial agents in the prior art and the problem of environmental pollution in the process of preparing the silver-loaded antibacterial agent, the invention provides a nano-silver antibacterial agent and a preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme:
the nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
further, the nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
further, the mass content of the silver nitrate is not less than 99%.
Further, the titanium dioxide is anatase titanium dioxide, and the particle size of the titanium dioxide is 100-500 nm.
Further, the dosage of the sodium hydroxide is 0.24 times of that of the silver nitrate, so that the sodium hydroxide and the silver nitrate just completely react.
In another aspect, the present invention provides a method for preparing the nano-silver antibacterial agent, comprising the following steps:
step 1: preparing silver nitrate aqueous solution and sodium hydroxide aqueous solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, mixing uniformly, adding a sodium hydroxide aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet materials into a box type electric heating drying box for drying treatment to obtain dry materials;
and 4, step 4: putting the dry materials into an electric heating roller kiln for calcination treatment to prepare calcined materials;
and 5: and adding the calcined material into a vortex pulverizer, pulverizing, and sieving to obtain the nano-silver antibacterial agent.
Further, in the step 3, the drying treatment is drying at 105 ℃ until the free water content is less than 2%.
Further, in the step 4, the calcination treatment is carried out at a temperature of 280-300 ℃ for not less than 1 hour.
Further, in the step 5, the mesh number of the sieve is 80 meshes.
The principle in the specific experimental process is as follows:
firstly, titanium dioxide and silver nitrate aqueous solution are uniformly mixed, silver ions are uniformly dispersed on titanium dioxide particles, and after sodium hydroxide aqueous solution is added, the silver ions and sodium hydroxide react to generate silver hydroxide. Then the silver hydroxide is dehydrated and decomposed in the drying process to generate silver oxide, and the generated silver oxide generates nano silver in the calcining process, namely the nano silver antibacterial agent is successfully prepared.
In the reaction process, when the sodium hydroxide is not enough to completely react the silver nitrate, the silver nitrate remains, the decomposition temperature of the silver nitrate is 440 ℃, namely the silver nitrate cannot be decomposed into silver simple substances in the subsequent calcination treatment process; when the amount of sodium hydroxide is excessively large, excessive sodium hydroxide remains, and the strong basicity of sodium hydroxide also causes damage to equipment. Therefore, the added amount of the sodium hydroxide is just completely reacted with the silver nitrate, so that no excess silver nitrate is left, no unreacted sodium hydroxide exists, no harmful gas is generated in the reaction process, and pollution-free preparation of the nano silver antibacterial agent is realized.
In the antibacterial agent, the active component metal silver with antibacterial action is loaded on the surface of titanium dioxide particles in a nano state, so that the number of active centers is maximized, the utilization rate of the active substance noble metal silver is improved, the cost of the silver antibacterial agent is reduced, and the defects that the noble metal silver antibacterial agent is expensive and difficult to popularize and apply are overcome; the defects of harm caused by small volatilization of the organic antibacterial agent and short validity period are overcome, and the defects of corrosion harm to people caused by strong alkali in inorganic antibacterial agents such as calcium hydroxide and the like, short validity period and the like are overcome. The defects of limited natural antibacterial agent resources, poor heat resistance and short effective period are overcome; has the characteristics of no harm to human skin, broad-spectrum sterilization, long-acting antibiosis, no drug resistance and the like.
The nano-silver antibacterial agent prepared by the invention has two antibacterial modes, one mode is nano-silver contact sterilization: when the nano silver contacts with pathogenic bacteria, the nano silver particles can directly enter the bacteria and quickly combine with sulfydryl (-SH) of oxygen metabolism enzyme after being combined with cell walls/membranes of the pathogenic bacteria, so that the enzyme is inactivated, respiratory metabolism is blocked, and the bacteria are choked to death. The nano-silver has stable physical and chemical properties, is not easy to inactivate and has antibacterial durability; the nano silver can kill various pathogenic microorganisms, is stronger than antibiotics, and the unique antibacterial mechanism of the nano silver particles can quickly and directly kill bacteria to enable the bacteria to lose the reproductive capacity, so that the next generation of drug resistance can not be produced, and the failure of the nano silver caused by the drug resistance can be effectively avoided. The other is that the outer layer electrons of the titanium atoms in the nano-silver surface atoms and titanium dioxide particles surface titanium dioxide molecules are subjected to light/heat excitation to generate electron/hole pairs, and can generate oxygen anions and hydroxyl anions in an indoor air environment, and the oxygen anions and the hydroxyl anions react with harmful microorganisms in the air such as mould, bacteria, viruses and the like to generate carbon dioxide, water, nitrogen and the like, so that the harmless treatment is thoroughly carried out; the nano silver contact sterilization and the sterilization synergistic effect of the silver and the titanium dioxide to release oxygen anions and hydroxyl anions improve the antibacterial and mildewproof capability of the product under indoor conditions.
The nano-silver antibacterial agent is successfully prepared by selecting a process for preparing the nano-silver by high-temperature decomposition by using silver nitrate as an initiator, industrial-grade titanium dioxide as a carrier and sodium hydroxide as a neutralizer and a hydrolytic agent. Compared with the existing preparation process of the nano-silver antibacterial agent, the complex process for preparing the nano-titanium dioxide and the reduction process of silver ions are not needed, the process is simplified, the pollution of harmful substances such as heavy metal and the like is eliminated, the equipment investment is reduced, and the cost is reduced. The invention provides an industrialized production method of the antibacterial agent, which is beneficial to industrialization, popularization and application of antibacterial functional materials and creation of ecological healthy human living environment.
In conclusion, the beneficial effects of the invention are as follows:
1) the invention utilizes the complete reaction of sodium hydroxide and silver nitrate to generate stable sodium nitrate, prevents harmful gases such as nitrogen dioxide and the like from being generated in the preparation process of the nano silver antibacterial agent, and realizes the pollution-free preparation of the nano antibacterial agent.
2) The prepared nano silver is loaded on the surface of the titanium dioxide through in-situ reaction and is uniformly dispersed, so that the number of active centers is maximized, the utilization rate of the active substance noble metal silver is improved, and the problem of uneven distribution of the nano silver caused by directly adding a silver simple substance is solved;
3) the nano silver contact sterilization and the sterilization synergistic effect of the silver and the titanium dioxide to release oxygen anions and hydroxyl anions improve the antibacterial and mildewproof capability of the product under indoor conditions;
4) the nano-silver antibacterial agent prepared by the invention has the advantages of low cost, good heat resistance, no harm to human skin, broad-spectrum sterilization, long-acting antibiosis, no drug resistance and the like;
5) the nano-silver antibacterial agent is prepared by selecting high-temperature decomposition with silver nitrate as an initiator, industrial-grade titanium dioxide as a carrier, sodium hydroxide as a neutralizer and a hydrolytic agent, and has the advantages of simple preparation process, no harmful pollution, reduced equipment investment and reduced cost.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to specific embodiments. The invention is in no way limited to these examples. The following description is only a preferred embodiment of the present invention, and is only for the purpose of explaining the present invention, and should not be construed as limiting the scope of the present invention. It should be understood that any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Example one
The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
the preparation method of the nano-silver antibacterial agent comprises the following steps:
step 1: uniformly mixing silver nitrate and 40 parts of water to prepare a silver nitrate water solution; mixing sodium hydroxide with 20 parts of water to prepare a sodium hydroxide aqueous solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, mixing uniformly, adding a sodium hydroxide aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet material into a box type electric heating drying oven for drying at 105 ℃ until the free water content is 1.2 wt%, thus obtaining a dry material;
and 4, step 4: putting the dry materials into an electric heating roller kiln for treatment at 280 ℃ for 1 hour to prepare a calcined material;
and 5: and adding the calcined material into a vortex grinder for grinding, and sieving by a 80-mesh sieve to obtain the nano-silver antibacterial agent.
Example two
The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
the preparation method of the nano-silver antibacterial agent comprises the following steps:
step 1: uniformly mixing silver nitrate and 70 parts of water to prepare a silver nitrate water solution; mixing sodium hydroxide with 30 parts of water to prepare a sodium hydroxide aqueous solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, mixing uniformly, adding a sodium hydroxide aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet material into a box type electric heating drying oven for drying at 105 ℃ until the free water content is 1.6 wt%, thus obtaining a dry material;
and 4, step 4: putting the dry materials into an electric heating roller kiln for treatment for 3 hours at 290 ℃ to prepare a calcined material;
and 5: and adding the calcined material into a vortex grinder for grinding, and sieving by a 80-mesh sieve to obtain the nano-silver antibacterial agent.
EXAMPLE III
The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
the preparation method of the nano-silver antibacterial agent comprises the following steps:
step 1: uniformly mixing silver nitrate and 70 parts of water to prepare a silver nitrate water solution; mixing sodium hydroxide and 40 parts of water to prepare a sodium hydroxide aqueous solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, mixing uniformly, adding a sodium hydroxide aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet material into a box type electric heating drying oven for drying at 105 ℃ until the free water content is 1.3 wt%, thus obtaining a dry material;
and 4, step 4: placing the dry materials into an electric heating roller kiln for treatment for 4 hours at 300 ℃ to prepare a calcined material;
and 5: and adding the calcined material into a vortex grinder for grinding, and sieving by a 80-mesh sieve to obtain the nano-silver antibacterial agent.
Example four
The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
the preparation method of the nano-silver antibacterial agent comprises the following steps:
step 1: uniformly mixing silver nitrate and 80 parts of water to prepare a silver nitrate water solution; mixing sodium hydroxide and 40 parts of water to prepare a sodium hydroxide aqueous solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, mixing uniformly, adding a sodium hydroxide aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet material into a box type electric heating drying oven for drying at 105 ℃ until the free water content is 1.5 wt%, thus obtaining a dry material;
and 4, step 4: placing the dry materials into an electric heating roller kiln for treatment for 1.5 hours at 300 ℃ to prepare a calcined material;
and 5: and adding the calcined material into a vortex grinder for grinding, and sieving by a 80-mesh sieve to obtain the nano-silver antibacterial agent.
Comparative example 1
The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
the preparation method of the nano-silver antibacterial agent refers to the preparation method of the nano-silver antibacterial agent in the third embodiment.
Comparative example No. two
The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
the dyeing preparation method of the nano silver antibacterial agent refers to the pollution-free preparation method of the nano silver antibacterial agent in the third embodiment.
Comparative example No. three
The nano-silver antibacterial agent is prepared from the following raw materials in parts by weight:
silver nitrate 1.4 parts
110 portions of titanium dioxide
100 parts of water.
The preparation method of the nano-silver antibacterial agent comprises the following steps:
step 1: uniformly mixing silver nitrate and 80 parts of water to prepare a silver nitrate water solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet material into a box type electric heating drying oven for drying at 105 ℃ until the free water content is 1.5 wt%, thus obtaining a dry material;
and 4, step 4: placing the dry materials into an electric heating roller kiln for treatment for 1.5 hours at 300 ℃ to prepare a calcined material;
and 5: and adding the calcined material into a vortex grinder for grinding, and sieving by a 80-mesh sieve to obtain the nano-silver antibacterial agent.
The nano-silver antibacterial agents prepared in the above examples and comparative examples were added to paints in an amount of 1.5 wt%, and the antibacterial rates against aspergillus niger and aspergillus terreus were measured, and the measurement results are shown in table 1.
TABLE 1
As can be seen from the above table, the antibacterial rate of the nano-silver antibacterial agent prepared by the invention can reach 97.5%. When the amount of the added sodium hydroxide is not just completely reacted with the silver nitrate, the bacteriostasis rate of the nano silver antibacterial agent to aspergillus niger and aspergillus terreus is lower than that of the nano silver antibacterial agent which can be just prepared by reaction no matter whether the added sodium hydroxide is more (comparative example two) or less (comparative example one).
The first comparative example has a poor bacteriostasis rate, and probably because silver nitrate which does not react with sodium hydroxide cannot be decomposed at 280-300 ℃ to generate nano silver, the nano silver antibacterial agent is loaded on titanium dioxide in the form of silver nitrate, and the bacteriostasis rate of the nano silver antibacterial agent is reduced.
The low bacteriostasis rate in the comparative example II is probably because the unreacted sodium hydroxide finally exists in the catalyst system in the form of sodium carbonate in the subsequent treatment process, covers the active center to a certain extent and reduces the bacteriostasis rate of the nano-silver antibacterial agent.
When no sodium hydroxide is added in the system (comparative example three), the antibacterial rate of the antibacterial agent prepared under the same condition is extremely low, which is probably because silver nitrate is not decomposed into silver simple substance, so that the antibacterial rate is low.
On the other hand, the amount of the sodium hydroxide added in the preparation process of the nano-silver antibacterial agent can be exactly and completely reacted with the silver nitrate, nitrogen dioxide generated in the subsequent calcination process due to incomplete reaction of the silver nitrate can not be generated, and equipment corrosion caused by complete reaction of the sodium hydroxide can not be generated. The invention realizes the pollution-free preparation method of the nano-silver antibacterial agent, and the raw materials adopted in the preparation process are convenient in source and low in cost.
The invention provides an economical and applicable nano-silver antibacterial agent which can be conveniently added into interior wall decorative materials such as diatom ooze and has excellent antibacterial and mildew-proof properties in indoor environment. The antibacterial agent is harmless to human and animals, and has the characteristics of broad-spectrum sterilization, long-acting antibacterial property, no drug resistance and the like. And the preparation process is simple, pollution-free, low in cost, easy to industrialize, popularize and apply, and beneficial to creating ecological and healthy human living environment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The nano-silver antibacterial agent is characterized by being prepared from the following raw materials in parts by weight:
wherein the titanium dioxide is industrial-grade anatase titanium dioxide with the particle size of 100-500nm, and the sodium hydroxide and the silver nitrate just completely react;
the nano-silver antibacterial agent is prepared by a method comprising the following steps:
step 1: preparing silver nitrate aqueous solution and sodium hydroxide aqueous solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, mixing uniformly, adding a sodium hydroxide aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet materials into a box type electric heating drying box for drying treatment to obtain dry materials;
and 4, step 4: putting the dry materials into an electric heating roller kiln for calcination treatment to prepare calcined materials;
and 5: and adding the calcined material into a vortex pulverizer to be pulverized and sieved to obtain the nano-silver antibacterial agent.
2. The nano-silver antibacterial agent as claimed in claim 1, which is prepared from the following raw materials in parts by weight:
3. the nano-silver antibacterial agent according to claim 1 or 2, wherein the silver nitrate is contained in an amount of not less than 99% by mass.
4. A method for preparing a nano-silver antibacterial agent according to any one of claims 1 to 3, comprising the steps of:
step 1: preparing silver nitrate aqueous solution and sodium hydroxide aqueous solution;
step 2: adding titanium dioxide into a planetary mixer, then adding a silver nitrate aqueous solution, mixing uniformly, adding a sodium hydroxide aqueous solution, and mixing uniformly to obtain a wet material;
and step 3: putting the wet materials into a box type electric heating drying box for drying treatment to obtain dry materials;
and 4, step 4: putting the dry materials into an electric heating roller kiln for calcination treatment to prepare calcined materials;
and 5: and adding the calcined material into a vortex pulverizer, pulverizing, and sieving to obtain the nano-silver antibacterial agent.
5. The method for preparing nano-silver antibacterial agent according to claim 4, wherein in the step 3, the drying treatment is drying at 105 ℃ until the free water content is less than 2%.
6. The method for preparing nano-silver antibacterial agent according to claim 4, wherein in the step 4, the calcination treatment is carried out at 280-300 ℃ for not less than 1 hour.
7. The method for preparing nano-silver antibacterial agent according to claim 4, wherein in the step 5, the mesh number of the sieve is 80 meshes.
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Address after: 115000 Liaoning Yingkou coastal industrial base, new Union Street 1 East. Applicant after: Yingkou Panpan diatom Material Group Co Ltd Address before: 115000 Liaoning Yingkou coastal industrial base, new Union Street 1 East. Applicant before: Yingkou Panpan Environmental Diatomite Material Co., Ltd. |
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