CN112063216A - Preparation method of environment-friendly putty paste for decoration - Google Patents
Preparation method of environment-friendly putty paste for decoration Download PDFInfo
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- CN112063216A CN112063216A CN202011127047.6A CN202011127047A CN112063216A CN 112063216 A CN112063216 A CN 112063216A CN 202011127047 A CN202011127047 A CN 202011127047A CN 112063216 A CN112063216 A CN 112063216A
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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
- C09D5/34—Filling pastes
Abstract
The invention relates to the technical field of putty paste preparation, in particular to a preparation method of environment-friendly putty paste for decoration; according to the invention, the diatomite is subjected to acid washing and soaking through the hydrochloric acid solution, so that the plugs in the diatomite pores are cleaned, in addition, the hydrochloric acid solution can also be used for carrying out certain acid etching on the surface of the diatomite, and then the diatomite is subjected to high-temperature sintering treatment, so that the specific surface area of the diatomite is effectively increased, and the adsorption rate of the diatomite to toxic substances such as indoor formaldehyde is also improved; moreover, the diatomite is immersed in the copper nitrate solution, so that copper ions in the copper nitrate can be retained in pores on the surface of the diatomite, the sterilization performance of the prepared putty paste is improved, and the shelf life of the putty paste is effectively prolonged; the matching use of the white carbon black powder and the sericite powder can also obviously improve the performance that the putty paste prepared by the invention has good wear resistance and excellent heat resistance, thereby effectively improving the quality of the putty paste.
Description
Technical Field
The invention relates to the technical field of putty paste preparation, and particularly relates to a preparation method of environment-friendly putty paste for decoration.
Background
The putty paste is a decorative setting material for leveling the surface of a wall body, is a paste-like coating, and is an essential product before painting. As a pasty finished putty, the putty paste is premixed and stirred before leaving a factory, and emulsion and filler in the product components are fully fused, so that the putty is particularly suitable for construction sites lacking water sources. When the putty paste is constructed on site, a constructor can use the putty paste only by opening the package and slightly stirring the package. Compared with putty powder products, the time of on-site stirring can be shortened, indoor air dust pollution is avoided, and meanwhile the phenomenon that later-stage wall surface air bubbles wrap dry powder is reduced to the greatest extent. Therefore, the dominant advantage of the putty paste is that the putty paste can be directly constructed, the operation is simple and convenient, the raised dust is reduced, and a water source is not needed. The construction of workers is convenient.
Although the putty paste has many advantages compared with putty powder, the putty paste prepared by the existing process has relatively short shelf life and relatively poor wear resistance and heat resistance. Moreover, the utility model has only decorative function, i.e. the function is relatively single.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of environment-friendly putty paste for decoration, which is used for solving the technical problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of environment-friendly putty paste for decoration comprises the following steps:
s1, respectively placing redispersible latex powder, sericite powder, ceramic calcium powder, inorganic bentonite, modified diatomite, double-flying powder and filler into a grinding machine for grinding treatment, sieving with a 200-300-mesh sieve, and respectively storing the obtained raw material fine powder for later use;
s2, accurately weighing the following components in parts by weight: 80-100 parts of neoprene latex, 15-22 parts of redispersible latex powder, 120-140 parts of white powder, 35-45 parts of sericite powder, 25-36 parts of calcium porcelain powder, 20-28 parts of inorganic bentonite, 22-30 parts of modified diatomite, 4-6 parts of bactericide, 2-4 parts of stabilizer, 18-25 parts of white carbon black powder, 30-36 parts of filler, 2.5-3.2 parts of water retention agent and 5-8 parts of thixotropic agent; respectively storing and standby;
s3, sequentially adding neoprene latex, whiting, sericite powder, ceramic calcium powder, white carbon black powder, inorganic bentonite, modified diatomite, a filler and 60-80 parts of water into a dispersion machine, setting the rotating speed of the dispersion machine to be 600-900 r/min, and stopping dispersion after dispersion is carried out for 20-30 min at the speed, wherein the obtained mixture is marked as a mixed material;
s4, adding the rest materials and a proper amount of distilled water into the mixture, and uniformly mixing and stirring; and then adjusting the viscosity of the putty paste to 125-145 KU to obtain a finished product of the environment-friendly putty paste.
Further, the preparation method of the modified diatomite comprises the following steps:
a. soaking a proper amount of dry diatomite in a hydrochloric acid solution with the mass being 6-9 times that of the diatomite and the concentration being 3-5 mol/L, mixing and stirring uniformly, reacting for 2-3 hours at a temperature of 60-75 ℃, then filtering out an upper-layer solution, and keeping filter residues for later use;
b. adding a 1.5-2.4 mol/L copper nitrate solution with the mass being 8-10 times of that of the filter residue obtained in the step a, uniformly stirring the mixture, and then carrying out heat preservation reaction for 3-5 hours at the temperature of 75-85 ℃ to obtain a mixed component;
c. and transferring the obtained mixed components into an oven, carrying out heat preservation reaction at 60-75 ℃, washing the mixed components to be neutral by using pure water after the reaction is finished, placing the obtained solid into a muffle furnace after centrifugal treatment, heating the muffle furnace to 480-650 ℃ at the speed of 10 ℃/min, sintering the solid at the temperature for 2-4 h, naturally cooling the sintered solid to room temperature, and grinding the sintered solid to obtain the modified diatomite finished product.
Furthermore, the particle size of the modified diatomite finished product in the step c is 200-300.
Furthermore, the bactericide is selected from one of caryophyllene and potassium permanganate.
Furthermore, the stabilizing agent is one of nano cerium oxide and nano zinc oxide.
Furthermore, the filler is one of talcum powder and heavy calcium carbonate.
Furthermore, the water-retaining agent is selected from one of polyacrylamide and sodium polyacrylate.
Furthermore, the thixotropic agent is selected from one of polyamide wax and hydrogenated castor oil.
By adopting the technical scheme, the invention has the beneficial effects that:
according to the invention, the diatomite is subjected to acid washing and soaking by using the hydrochloric acid solution, so that the plugs in the diatomite pores are cleaned, in addition, the surface of the diatomite can be subjected to certain acid etching by using the hydrochloric acid solution, and then the diatomite is subjected to high-temperature sintering treatment, so that the specific surface area of the diatomite is effectively increased, and the adsorption rate of the diatomite to toxic substances such as indoor formaldehyde is also improved. And moreover, the diatomite is immersed in the copper nitrate solution, so that copper ions in the copper nitrate can be retained in pores on the surface of the diatomite, the sterilization performance of the prepared putty paste is improved, and the shelf life of the putty paste is effectively prolonged. The matching use of the white carbon black powder and the sericite powder can also obviously improve the performance that the putty paste prepared by the invention has good wear resistance and excellent heat resistance, thereby effectively improving the quality of the putty paste.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
a preparation method of environment-friendly putty paste for decoration comprises the following steps:
s1, respectively placing redispersible latex powder, sericite powder, calcium ceramides powder, inorganic bentonite, modified diatomite, double-flying powder and filler into a grinding machine for grinding treatment, sieving with a 200-mesh sieve, and respectively storing the obtained raw material fine powder for later use;
s2, accurately weighing the following components in parts by weight: 85 parts of neoprene latex, 15 parts of redispersible latex powder, 125 parts of white powder, 35 parts of sericite powder, 30 parts of calcium porcelain powder, 20 parts of inorganic bentonite, 25 parts of modified diatomite, 4 parts of bactericide, 3 parts of stabilizer, 18 parts of white carbon black powder, 32 parts of filler, 2.5 parts of water-retaining agent and 6 parts of thixotropic agent; respectively storing and standby;
s3, sequentially adding neoprene latex, whiting, sericite powder, calcium ceramicized powder, white carbon black powder, inorganic bentonite, modified diatomite, a filler and 60 parts of water into a dispersion machine, setting the rotating speed of the dispersion machine to 600r/min, stopping dispersion after dispersion for 20min at the speed, and marking the obtained mixture as a mixed material;
s4, adding the rest materials and a proper amount of distilled water into the mixture, and uniformly mixing and stirring; and then adjusting the viscosity of the putty paste to 125KU to obtain a finished product of the environment-friendly putty paste.
The preparation method of the modified diatomite comprises the following steps:
a. soaking a proper amount of dry diatomite in a hydrochloric acid solution with the mass being 6 times that of the diatomite and the concentration being 3mol/L, uniformly mixing and stirring, carrying out heat preservation reaction for 2 hours at the temperature of 60 ℃, then filtering out an upper layer solution, and keeping filter residues for later use;
b. adding a copper nitrate solution with the mass of 8 times and the concentration of 1.5mol/L into the filter residue obtained in the step a, uniformly stirring, and then carrying out heat preservation reaction for 3 hours at the temperature of 75 ℃, wherein the obtained mixture is marked as a mixed component;
c. and transferring the obtained mixed components into an oven, carrying out heat preservation reaction at 60 ℃, washing the mixed components to be neutral by using pure water after the reaction is finished, placing the obtained solid into a muffle furnace after the centrifugal treatment, heating the muffle furnace to 480 ℃ at the speed of 10 ℃/min, sintering the solid for 2 hours at the temperature, naturally cooling the solid to room temperature after the sintering is finished, and grinding the solid to obtain the modified diatomite finished product.
The particle size of the modified diatomite finished product in the step c is 200.
The bactericide is caryophyllene.
The stabilizing agent is selected from nano cerium oxide.
The filler is talcum powder.
The water-retaining agent is polyacrylamide.
The thixotropic agent is selected from polyamide wax.
Example 2:
a preparation method of environment-friendly putty paste for decoration comprises the following steps:
s1, respectively placing redispersible latex powder, sericite powder, calcium ceramides powder, inorganic bentonite, modified diatomite, double-flying powder and filler into a grinding machine for grinding treatment, sieving with a 250-mesh sieve, and respectively storing the obtained raw material fine powder for later use;
s2, accurately weighing the following components in parts by weight: 80 parts of neoprene latex, 18 parts of redispersible latex powder, 120 parts of white powder, 38 parts of sericite powder, 25 parts of calcium porcelain powder, 22 parts of inorganic bentonite, 22 parts of modified diatomite, 5 parts of bactericide, 2 parts of stabilizer, 20 parts of white carbon black powder, 30 parts of filler, 2.8 parts of water retention agent and 5 parts of thixotropic agent; respectively storing and standby;
s3, sequentially adding neoprene latex, whiting, sericite powder, calcium ceramicized powder, white carbon black powder, inorganic bentonite, modified diatomite, a filler and 65 parts of water into a dispersion machine, setting the rotating speed of the dispersion machine to 700r/min, stopping dispersion after 25min of dispersion at the speed, and marking the obtained mixture as a mixed material;
s4, adding the rest materials and a proper amount of distilled water into the mixture, and uniformly mixing and stirring; and then adjusting the viscosity of the putty paste to 130KU to obtain a finished product of the environment-friendly putty paste.
The preparation method of the modified diatomite comprises the following steps:
a. soaking a proper amount of dry diatomite in a hydrochloric acid solution with the mass being 7 times that of the diatomite and the concentration being 4mol/L, uniformly mixing and stirring, carrying out heat preservation reaction for 2 hours at the temperature of 65 ℃, then filtering out an upper layer solution, and keeping filter residues for later use;
b. adding a copper nitrate solution with the mass being 9 times that of the filter residue obtained in the step a and the concentration being 1.8mol/L into the filter residue obtained in the step a, uniformly stirring the mixture, and then carrying out heat preservation reaction for 4 hours at the temperature of 80 ℃ to obtain a mixed component;
c. and transferring the obtained mixed components into an oven, carrying out heat preservation reaction at 65 ℃, washing the mixed components to be neutral by using pure water after the reaction is finished, placing the obtained solid into a muffle furnace after the centrifugal treatment, heating the solid to 540 ℃ at the speed of 10 ℃/min in the muffle furnace, sintering the solid for 3 hours at the temperature, naturally cooling the solid to room temperature after the sintering is finished, and grinding the solid to obtain the modified diatomite finished product.
The particle size of the modified diatomite finished product in the step c is 250.
The bactericide is potassium permanganate.
The stabilizing agent is selected from nano zinc oxide.
The filler is heavy calcium carbonate.
The water-retaining agent is sodium polyacrylate.
The thixotropic agent is hydrogenated castor oil.
Example 3:
a preparation method of environment-friendly putty paste for decoration comprises the following steps:
s1, respectively placing redispersible latex powder, sericite powder, calcium ceramides powder, inorganic bentonite, modified diatomite, double-flying powder and filler into a grinder for grinding treatment, sieving with a 280-mesh sieve, and respectively storing the obtained raw material fine powder for later use;
s2, accurately weighing the following components in parts by weight: 100 parts of neoprene latex, 20 parts of redispersible latex powder, 140 parts of white powder, 40 parts of sericite powder, 36 parts of ceramic calcium powder, 25 parts of inorganic bentonite, 30 parts of modified diatomite, 5 parts of bactericide, 4 parts of stabilizer, 23 parts of white carbon black powder, 36 parts of filler, 3.0 parts of water retention agent and 8 parts of thixotropic agent; respectively storing and standby;
s3, sequentially adding neoprene latex, whiting, sericite powder, calcium ceramicized powder, white carbon black powder, inorganic bentonite, modified diatomite, a filler and 70 parts of water into a dispersion machine, setting the rotating speed of the dispersion machine to be 800r/min, stopping dispersion after 25min of dispersion at the speed, and marking the obtained mixture as a mixed material;
s4, adding the rest materials and a proper amount of distilled water into the mixture, and uniformly mixing and stirring; and then adjusting the viscosity of the putty paste to 140KU to obtain a finished product of the environment-friendly putty paste.
The preparation method of the modified diatomite comprises the following steps:
a. soaking a proper amount of dry diatomite in a hydrochloric acid solution with the mass of 8 times and the concentration of 4mol/L, uniformly mixing and stirring, carrying out heat preservation reaction for 3 hours at the temperature of 70 ℃, then filtering out an upper layer solution, and keeping filter residues for later use;
b. adding a copper nitrate solution with the mass being 9 times that of the filter residue obtained in the step a and the concentration being 2.0mol/L into the filter residue obtained in the step a, uniformly stirring the mixture, and then carrying out heat preservation reaction for 4 hours at the temperature of 80 ℃ to obtain a mixed component;
c. and transferring the obtained mixed components into an oven, carrying out heat preservation reaction at 70 ℃, washing the mixed components to be neutral by using pure water after the reaction is finished, placing the obtained solid into a muffle furnace after the centrifugal treatment, heating the muffle furnace to 600 ℃ at the speed of 10 ℃/min, sintering the solid for 3 hours at the temperature, naturally cooling the solid to room temperature after the sintering is finished, and grinding the solid to obtain the modified diatomite finished product.
The particle size of the modified diatomite finished product in the step c is 280.
The bactericide is caryophyllene.
The stabilizing agent is selected from nano cerium oxide.
The filler is talcum powder.
The water-retaining agent is polyacrylamide.
The thixotropic agent is selected from polyamide wax.
Example 4:
a preparation method of environment-friendly putty paste for decoration comprises the following steps:
s1, respectively placing redispersible latex powder, sericite powder, calcium ceramides powder, inorganic bentonite, modified diatomite, double-flying powder and filler into a grinder for grinding treatment, sieving with a 300-mesh sieve, and respectively storing the obtained raw material fine powder for later use;
s2, accurately weighing the following components in parts by weight: 90 parts of neoprene latex, 22 parts of redispersible latex powder, 130 parts of white powder, 45 parts of sericite powder, 32 parts of ceramic calcium powder, 28 parts of inorganic bentonite, 28 parts of modified diatomite, 6 parts of bactericide, 3 parts of stabilizer, 25 parts of white carbon black powder, 34 parts of filler, 3.2 parts of water-retaining agent and 7 parts of thixotropic agent; respectively storing and standby;
s3, sequentially adding neoprene latex, whiting, sericite powder, calcium ceramicized powder, white carbon black powder, inorganic bentonite, modified diatomite, a filler and 80 parts of water into a dispersion machine, setting the rotating speed of the dispersion machine to 900r/min, stopping dispersion after dispersing for 30min at the speed, and marking the obtained mixture as a mixed material;
s4, adding the rest materials and a proper amount of distilled water into the mixture, and uniformly mixing and stirring; and then adjusting the viscosity of the putty paste to 145KU to obtain a finished product of the environment-friendly putty paste.
The preparation method of the modified diatomite comprises the following steps:
a. soaking a proper amount of dry diatomite in a hydrochloric acid solution with the mass being 9 times that of the diatomite and the concentration being 5mol/L, uniformly mixing and stirring, carrying out heat preservation reaction for 3 hours at the temperature of 75 ℃, then filtering out an upper layer solution, and keeping filter residues for later use;
b. adding a 1.5-2.4 mol/L copper nitrate solution with the mass being 10 times that of the filter residue obtained in the step a into the filter residue obtained in the step a, uniformly stirring the mixture, and then carrying out heat preservation reaction for 5 hours at the temperature of 85 ℃ to obtain a mixed component;
c. and transferring the obtained mixed components into an oven, carrying out heat preservation reaction at 75 ℃, washing the mixed components to be neutral by using pure water after the reaction is finished, placing the obtained solid into a muffle furnace after the centrifugal treatment, heating the muffle furnace to 650 ℃ at the speed of 10 ℃/min, sintering the solid for 4 hours at the temperature, naturally cooling the solid to room temperature after the sintering is finished, and grinding the solid to obtain the modified diatomite finished product.
The particle size of the modified diatomite finished product in the step c is 300.
The bactericide is potassium permanganate.
The stabilizing agent is selected from nano zinc oxide.
The filler is heavy calcium carbonate.
The water-retaining agent is sodium polyacrylate.
The thixotropic agent is hydrogenated castor oil.
And (3) performance detection:
the putty pastes prepared in examples 1-4 of the present invention (identified as examples 1-4, respectively) were tested for performance with commercially available putty pastes (identified as comparative ratios), and the data reported below were obtained:
note: 1. the expansion rate detection method comprises the following steps: smearing the putty paste on the wood board, placing the wood board in a constant-temperature drying oven with the temperature set to be 60 ℃, and standing for 2 hours under heat preservation; then taken out to measure the expansion rate.
2. And (3) detecting the formaldehyde adsorption rate: the formaldehyde content in different closed spaces with the same area is measured before and after the putty pastes (comparative example and example) are used respectively, the formaldehyde content in the closed spaces is measured after the putty pastes are used for 6 hours (the putty pastes are smeared on wall surfaces with the same area), and the indoor formaldehyde reduction percentage is obtained through calculation.
From the data in the table above, it can be seen that: the putty paste prepared by the method has better heat resistance, scrub resistance, antibacterial property and formaldehyde adsorption performance than the commercial putty paste. The putty paste prepared by the invention has wide market prospect and is more suitable for popularization
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The preparation method of the environment-friendly putty paste for decoration is characterized by comprising the following steps:
s1, respectively placing redispersible latex powder, sericite powder, ceramic calcium powder, inorganic bentonite, modified diatomite, double-flying powder and filler into a grinding machine for grinding treatment, sieving with a 200-300-mesh sieve, and respectively storing the obtained raw material fine powder for later use;
s2, accurately weighing the following components in parts by weight: 80-100 parts of neoprene latex, 15-22 parts of redispersible latex powder, 120-140 parts of white powder, 35-45 parts of sericite powder, 25-36 parts of calcium porcelain powder, 20-28 parts of inorganic bentonite, 22-30 parts of modified diatomite, 4-6 parts of bactericide, 2-4 parts of stabilizer, 18-25 parts of white carbon black powder, 30-36 parts of filler, 2.5-3.2 parts of water retention agent and 5-8 parts of thixotropic agent; respectively storing and standby;
s3, sequentially adding neoprene latex, whiting, sericite powder, ceramic calcium powder, white carbon black powder, inorganic bentonite, modified diatomite, a filler and 60-80 parts of water into a dispersion machine, setting the rotating speed of the dispersion machine to be 600-900 r/min, and stopping dispersion after dispersion is carried out for 20-30 min at the speed, wherein the obtained mixture is marked as a mixed material;
s4, adding the rest materials and a proper amount of distilled water into the mixture, and uniformly mixing and stirring; and then adjusting the viscosity of the putty paste to 125-145 KU to obtain a finished product of the environment-friendly putty paste.
2. The preparation method of the environment-friendly putty paste for decoration according to claim 1, wherein the preparation method of the modified diatomite comprises the following steps:
a. soaking a proper amount of dry diatomite in a hydrochloric acid solution with the mass being 6-9 times that of the diatomite and the concentration being 3-5 mol/L, mixing and stirring uniformly, reacting for 2-3 hours at a temperature of 60-75 ℃, then filtering out an upper-layer solution, and keeping filter residues for later use;
b. adding a 1.5-2.4 mol/L copper nitrate solution with the mass being 8-10 times of that of the filter residue obtained in the step a, uniformly stirring the mixture, and then carrying out heat preservation reaction for 3-5 hours at the temperature of 75-85 ℃ to obtain a mixed component;
c. and transferring the obtained mixed components into an oven, carrying out heat preservation reaction at 60-75 ℃, washing the mixed components to be neutral by using pure water after the reaction is finished, placing the obtained solid into a muffle furnace after centrifugal treatment, heating the muffle furnace to 480-650 ℃ at the speed of 10 ℃/min, sintering the solid at the temperature for 2-4 h, naturally cooling the sintered solid to room temperature, and grinding the sintered solid to obtain the modified diatomite finished product.
3. The preparation method of the environment-friendly finishing putty paste as claimed in claim 2, which is characterized in that: and c, the particle size of the modified diatomite finished product in the step c is 200-300.
4. The preparation method of the environment-friendly finishing putty paste as claimed in claim 1, which is characterized in that: the bactericide is selected from one of caryophyllene and potassium permanganate.
5. The preparation method of the environment-friendly finishing putty paste as claimed in claim 1, which is characterized in that: the stabilizer is selected from one of nano cerium oxide and nano zinc oxide.
6. The preparation method of the environment-friendly finishing putty paste as claimed in claim 1, which is characterized in that: the filler is one of talcum powder and heavy calcium carbonate.
7. The preparation method of the environment-friendly finishing putty paste as claimed in claim 1, which is characterized in that: the water-retaining agent is selected from one of polyacrylamide and sodium polyacrylate.
8. The preparation method of the environment-friendly finishing putty paste as claimed in claim 1, which is characterized in that: the thixotropic agent is one of polyamide wax and hydrogenated castor oil.
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| CN202011127047.6A CN112063216A (en) | 2020-10-20 | 2020-10-20 | Preparation method of environment-friendly putty paste for decoration |
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| CN202011127047.6A CN112063216A (en) | 2020-10-20 | 2020-10-20 | Preparation method of environment-friendly putty paste for decoration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113199835A (en) * | 2021-05-21 | 2021-08-03 | 浙江金蓝医疗科技有限公司 | Critical low-resistance mask and production process thereof |
-
2020
- 2020-10-20 CN CN202011127047.6A patent/CN112063216A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113199835A (en) * | 2021-05-21 | 2021-08-03 | 浙江金蓝医疗科技有限公司 | Critical low-resistance mask and production process thereof |
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