Antibacterial non-woven fabric for mask and preparation method thereof
1. The utility model provides an antibiotic non-woven fabrics for gauze mask which characterized in that: the feed comprises the following raw materials in parts by weight: 80-100 parts of PET polyester chips, 5-10 parts of antibacterial agent, 1-3 parts of lubricant, 3-5 parts of toughening agent and 5-8 parts of plasticizer;
the antibacterial agent is prepared by the following steps:
step A1: adding epoxy chloropropane and N, N-dimethyl dodecyl tertiary amine into a reaction kettle for reaction to prepare an intermediate 1, adding diethyl carbonate, 2-amino-2-ethyl-1, 3-propylene glycol and sodium methoxide into the reaction kettle for reflux reaction to prepare an intermediate 2, and adding the intermediate 1, the intermediate 2 and dimethyl sulfoxide into the reaction kettle for reaction to prepare an intermediate 3;
step A2: adding methacrylic acid, dimethylaminoethanol and concentrated sulfuric acid into a reaction kettle for reaction to prepare an intermediate 4, adding the intermediate 4, p-nitrobenzyl chloride, hydroquinone and acetone into the reaction kettle for reflux reaction to prepare an intermediate 5, adding the intermediate 5, tin powder and concentrated hydrochloric acid into the reaction kettle for reaction, and adjusting the pH value of a reaction solution to prepare an intermediate 6;
step A3: dissolving cyanuric chloride in acetone, stirring, adding 2,2,6, 6-tetramethyl piperidinol, maintaining the pH value of the reaction solution at 7-8, after reaction, adding an intermediate 6, heating to continue reaction for 2-3h to obtain an intermediate 7, adding an intermediate 3, methacryloyl chloride, hydroquinone and chloroform into a reaction kettle, stirring, adding sodium hydroxide, reacting to obtain an intermediate 8, adding the intermediate 7, the intermediate 8 and toluene into the reaction kettle, stirring, dropwise adding an ammonium persulfate solution, reacting, and removing methanol to obtain the antibacterial agent.
2. The antibacterial nonwoven fabric for masks according to claim 1, characterized in that: the lubricant is one or more of stearic acid, butyl stearate and oleamide which are mixed in any proportion, and the plasticizer is one or more of di (2-ethylhexyl) phthalate, dibutyl phthalate and diethyl phthalate which are mixed in any proportion.
3. The antibacterial nonwoven fabric for masks according to claim 1, characterized in that: the using amount ratio of the epichlorohydrin to the N, N-dimethyl dodecyl tertiary amine in the step A1 is 12 g: 0.05mol, the dosage ratio of diethyl carbonate, 2-amino-2-ethyl-1, 3-propylene glycol and sodium methoxide is 0.13mol:0.11mol:0.5g, and the dosage ratio of intermediate 1, intermediate 2 and dimethyl sulfoxide is 0.01mol:20mL:0.015 mol.
4. The antibacterial nonwoven fabric for masks according to claim 1, characterized in that: the dosage ratio of the methacrylic acid, the dimethylaminoethanol and the concentrated sulfuric acid in the step A2 is 0.01mol:0.01mol:15mL, the mass fraction of the concentrated sulfuric acid is 95%, the dosage ratio of the intermediate 4, the p-nitrobenzyl chloride, the hydroquinone and the acetone is 0.1mol:0.1mol:2g:60mL, the dosage ratio of the intermediate 5, the tin powder and the concentrated hydrochloric acid is 3g:5g:20mL, and the mass fraction of the concentrated hydrochloric acid is 37%.
5. The antibacterial nonwoven fabric for masks according to claim 1, characterized in that: the molar ratio of the cyanuric chloride to the 2,2,6, 6-tetramethyl piperidinol to the intermediate 6 in the step A3 is 1:1:1, the molar ratio of the intermediate 3 to the methacryloyl chloride to the hydroquinone to the chloroform to the sodium hydroxide is 0.03mol to 40mL to 5g, the molar ratio of the intermediate 7 to the intermediate 8 to the ammonium persulfate solution is 4-5g to 3-5g to 2mL, and the mass fraction of the ammonium persulfate solution is 10%.
6. The method for preparing an antibacterial non-woven fabric for a mask according to claim 1, wherein the method comprises the following steps: the method specifically comprises the following steps:
step S1: adding PET polyester chips, an antibacterial agent, a lubricant and a plasticizer into an extruder, and performing melt extrusion to obtain polyester fibers;
step S2: weaving the polyester fiber into cloth to obtain the antibacterial non-woven fabric for the mask.
Background
In recent years, a large-scale epidemic situation is often respiratory infectious disease, such as SARS, highly pathogenic avian influenza, influenza a H1N1, and the like. The respiratory infectious disease is transmitted by droplets and air, has the characteristics of high transmission speed, wide susceptible population and high morbidity, and poses great threat to public health. The protective mask can block pathogenic microorganisms from invading human bodies when being worn, and is an effective means for preventing the epidemic of respiratory infectious diseases and protecting the health of personnel. Adherence to wearing masks can reduce influenza infection, and many countries use reserve protective masks as a means of non-pharmaceutical intervention to control the spread of pathogenic microorganisms during influenza outbreaks.
The existing antibacterial non-woven fabric for the mask has a certain antibacterial property, but part of bacteria still can not be killed in the using process, so that the bacteria are bred in the mask, and meanwhile, after the mask is placed for a long time, the antibacterial components in the mask can be separated out, so that the antibacterial effect of the mask is reduced.
Disclosure of Invention
The invention aims to provide an antibacterial non-woven fabric for a mask and a preparation method thereof.
The technical problems to be solved by the invention are as follows:
the existing antibacterial non-woven fabric for the mask has a certain antibacterial property, but part of bacteria still can not be killed in the using process, so that the bacteria are bred in the mask, and meanwhile, after the mask is placed for a long time, the antibacterial components in the mask can be separated out, so that the antibacterial effect of the mask is reduced.
The purpose of the invention can be realized by the following technical scheme:
an antibacterial non-woven fabric for a mask comprises the following raw materials in parts by weight: 80-100 parts of PET polyester chips, 5-10 parts of antibacterial agent, 1-3 parts of lubricant and 5-8 parts of plasticizer;
step S1: adding PET polyester chips, an antibacterial agent, a lubricant and a plasticizer into an extruder, and performing melt extrusion to obtain polyester fibers;
step S2: weaving the polyester fiber into cloth to obtain the antibacterial non-woven fabric for the mask.
Further, the lubricant is one or a mixture of more of stearic acid, butyl stearate and oleamide in any proportion, and the plasticizer is one or a mixture of more of di (2-ethylhexyl) phthalate, dibutyl phthalate and diethyl phthalate in any proportion.
Further, the antibacterial agent is prepared by the following steps:
step A1: adding epoxy chloropropane and N, N-dimethyl dodecyl tertiary amine into a reaction kettle, reacting for 2-4h under the conditions that the rotation speed is 200-;
the reaction process is as follows:
step A2: adding methacrylic acid, dimethylaminoethanol and concentrated sulfuric acid into a reaction kettle, reacting for 4-6h at the rotation speed of 200-90 ℃ for 300r/min to obtain an intermediate 4, adding the intermediate 4, p-nitrobenzyl chloride, hydroquinone and acetone into the reaction kettle, performing reflux reaction for 5-7h at the temperature of 45-50 ℃ to obtain an intermediate 5, adding the intermediate 5, tin powder and concentrated hydrochloric acid into the reaction kettle, reacting for 2-3h at the rotation speed of 150-200r/min, and adjusting the pH value of a reaction solution to 10 to obtain an intermediate 6;
the reaction process is as follows:
step A3: dissolving cyanuric chloride in acetone, stirring and adding 2,2,6, 6-tetramethylpiperidinol under the conditions of a rotation speed of 150-5 ℃ and a temperature of 0-5 ℃, maintaining the pH value of a reaction solution to be 7-8, adding an intermediate 6 after reacting for 3-5h, continuing to react for 2-3h under the condition of a temperature of 80-90 ℃ to obtain an intermediate 7, adding the intermediate 3, methacryloyl chloride, hydroquinone and chloroform into a reaction kettle, stirring and adding sodium hydroxide under the conditions of a rotation speed of 200-300r/min and a temperature of 35-40 ℃ to react for 5-7h to obtain an intermediate 8, adding the intermediate 7, the intermediate 8 and toluene into the reaction kettle, reacting at a rotation speed of 300-55 r/min and a temperature of 50-55 ℃, stirring and dropwise adding an ammonium persulfate solution, reacting for 4-6h, and removing methanol to obtain the antibacterial agent.
The reaction process is as follows:
further, the using ratio of the epichlorohydrin to the N, N-dimethyl dodecyl tertiary amine in the step A1 is 12 g: 0.05mol, the dosage ratio of diethyl carbonate, 2-amino-2-ethyl-1, 3-propylene glycol and sodium methoxide is 0.13mol:0.11mol:0.5g, and the dosage ratio of intermediate 1, intermediate 2 and dimethyl sulfoxide is 0.01mol:20mL:0.015 mol.
Further, the dosage ratio of the methacrylic acid, the dimethylaminoethanol and the concentrated sulfuric acid in the step A2 is 0.01mol:0.01mol:15mL, the mass fraction of the concentrated sulfuric acid is 95%, the dosage ratio of the intermediate 4, the p-nitrobenzyl chloride, the hydroquinone and the acetone is 0.1mol:0.1mol:2g:60mL, the dosage ratio of the intermediate 5, the tin powder and the concentrated hydrochloric acid is 3g:5g:20mL, and the mass fraction of the concentrated hydrochloric acid is 37%.
Further, the molar ratio of the cyanuric chloride to the 2,2,6, 6-tetramethylpiperidinol to the intermediate 6 in the step A3 is 1:1:1, the molar ratio of the intermediate 3 to the methacryloyl chloride to the hydroquinone to the chloroform to the sodium hydroxide is 0.03mol to 40mL to 5g, the molar ratio of the intermediate 7 to the intermediate 8 to the ammonium persulfate solution is 4-5g to 3-5g to 2mL, and the mass fraction of the ammonium persulfate solution is 10%.
A preparation method of an antibacterial non-woven fabric for a mask specifically comprises the following steps:
step S1: adding PET polyester chips, an antibacterial agent, a lubricant and a plasticizer into an extruder, and performing melt extrusion to obtain polyester fibers;
step S2: weaving the polyester fiber into cloth to obtain the antibacterial non-woven fabric for the mask.
The invention has the beneficial effects that: the invention discloses an antibacterial agent prepared in the process of preparing an antibacterial non-woven fabric for a mask, which is characterized in that epichlorohydrin and N, N-dimethyl dodecyl tertiary amine are used as raw materials to react to prepare an intermediate 1, diethyl carbonate and 2-amino-2-ethyl-1, 3-propylene glycol are reacted to prepare an intermediate 2, the intermediate 1 and the intermediate 2 are reacted to prepare an intermediate 3, methacrylic acid and dimethylaminoethanol are subjected to esterification reaction to prepare an intermediate 4, the intermediate 4 and p-nitro benzyl chloride are reacted to prepare an intermediate 5, the intermediate 5 is reduced by tin powder to convert nitro into amino to prepare an intermediate 6, cyanuric chloride is sequentially reacted with 2,2,6, 6-tetramethyl piperidinol and the intermediate 6 by temperature control, the intermediate 7 is prepared, the intermediate 3 reacts with methacryloyl chloride to prepare an intermediate 8, the intermediate 8 and the intermediate 7 are polymerized to prepare the antibacterial agent, the antibacterial agent belongs to a polymer, the antibacterial effect of the mask is not reduced after the mask is used for a period of time, meanwhile, the molecular structure of the antibacterial agent contains a large number of quaternary ammonium salt structures, the activity of metabolic enzymes in microbial cells can be reduced to block the respiration of the mask, the generation of substances required by bacterial production is interfered, the synthesis of cell walls is damaged, the cells are further killed, and the antibacterial effect of the mask is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An antibacterial non-woven fabric for a mask comprises the following raw materials in parts by weight: 80 parts of PET polyester chips, 5 parts of an antibacterial agent, 1 part of a lubricant and 5 parts of a plasticizer;
step S1: adding PET polyester chips, an antibacterial agent, a lubricant and a plasticizer into an extruder, and performing melt extrusion to obtain polyester fibers;
step S2: weaving the polyester fiber into cloth to obtain the antibacterial non-woven fabric for the mask.
The antibacterial agent is prepared by the following steps:
step A1: adding epoxy chloropropane and N, N-dimethyl dodecyl tertiary amine into a reaction kettle, reacting for 2h at the rotation speed of 200r/min and the temperature of 55 ℃ to obtain an intermediate 1, adding diethyl carbonate, 2-amino-2-ethyl-1, 3-propylene glycol and sodium methoxide into the reaction kettle, performing reflux reaction for 35h at the rotation speed of 150r/min and the temperature of 115 ℃ to obtain an intermediate 2, adding the intermediate 1, the intermediate 2 and dimethyl sulfoxide into the reaction kettle, and reacting for 3h at the rotation speed of 150r/min and the temperature of 60 ℃ to obtain an intermediate 3, wherein the pH value of a reaction solution is 8;
step A2: adding methacrylic acid, dimethylaminoethanol and concentrated sulfuric acid into a reaction kettle, reacting for 4 hours at the rotating speed of 200r/min and the temperature of 80 ℃ to obtain an intermediate 4, adding the intermediate 4, p-nitrobenzyl chloride, hydroquinone and acetone into the reaction kettle, performing reflux reaction for 5 hours at the temperature of 45 ℃ to obtain an intermediate 5, adding the intermediate 5, tin powder and concentrated hydrochloric acid into the reaction kettle, reacting for 2 hours at the rotating speed of 150r/min, and then adjusting the pH value of a reaction solution to 10 to obtain an intermediate 6;
step A3: dissolving cyanuric chloride in acetone, stirring and adding 2,2,6, 6-tetramethyl piperidinol under the conditions of the rotating speed of 150r/min and the temperature of 0 ℃, keeping the pH value of a reaction solution at 7, adding an intermediate 6 after reacting for 3h, continuing to react for 2h under the condition of the temperature of 80 ℃ to obtain an intermediate 7, adding the intermediate 3, methacryloyl chloride, hydroquinone and chloroform into a reaction kettle, stirring and adding sodium hydroxide under the conditions of the rotating speed of 200 and 300r/min and the temperature of 35 ℃ to react for 5h to obtain an intermediate 8, adding the intermediate 7, the intermediate 8 and toluene into the reaction kettle, stirring and dropwise adding an ammonium persulfate solution under the conditions of the rotating speed of 200r/min and the temperature of 50 ℃ to react for 4h and remove methanol to obtain the antibacterial agent.
Example 2
An antibacterial non-woven fabric for a mask comprises the following raw materials in parts by weight: 85 parts of PET polyester chips, 7 parts of an antibacterial agent, 2 parts of a lubricant and 6 parts of a plasticizer;
step S1: adding PET polyester chips, an antibacterial agent, a lubricant and a plasticizer into an extruder, and performing melt extrusion to obtain polyester fibers;
step S2: weaving the polyester fiber into cloth to obtain the antibacterial non-woven fabric for the mask.
The antibacterial agent is prepared by the following steps:
step A1: adding epoxy chloropropane and N, N-dimethyl dodecyl tertiary amine into a reaction kettle, reacting for 2h at the rotation speed of 200r/min and the temperature of 65 ℃ to obtain an intermediate 1, adding diethyl carbonate, 2-amino-2-ethyl-1, 3-propylene glycol and sodium methoxide into the reaction kettle, performing reflux reaction for 40h at the rotation speed of 200r/min and the temperature of 115 ℃ to obtain an intermediate 2, adding the intermediate 1, the intermediate 2 and dimethyl sulfoxide into the reaction kettle, and reacting for 5h at the rotation speed of 150r/min and the temperature of 70 ℃ to obtain an intermediate 3, wherein the pH value of a reaction solution is 8;
step A2: adding methacrylic acid, dimethylaminoethanol and concentrated sulfuric acid into a reaction kettle, reacting for 4 hours at the rotating speed of 200r/min and the temperature of 90 ℃ to obtain an intermediate 4, adding the intermediate 4, p-nitrobenzyl chloride, hydroquinone and acetone into the reaction kettle, performing reflux reaction for 5 hours at the temperature of 50 ℃ to obtain an intermediate 5, adding the intermediate 5, tin powder and concentrated hydrochloric acid into the reaction kettle, reacting for 2 hours at the rotating speed of 200r/min, and then adjusting the pH value of a reaction solution to 10 to obtain an intermediate 6;
step A3: dissolving cyanuric chloride in acetone, stirring and adding 2,2,6, 6-tetramethyl piperidinol under the conditions of the rotation speed of 200r/min and the temperature of 0 ℃, keeping the pH value of a reaction solution at 8, adding an intermediate 6 after reacting for 3h, continuing to react for 2h under the condition of the temperature of 90 ℃ to obtain an intermediate 7, adding the intermediate 3, methacryloyl chloride, hydroquinone and chloroform into a reaction kettle, stirring and adding sodium hydroxide under the conditions of the rotation speed of 300r/min and the temperature of 35 ℃ to react for 7h to obtain an intermediate 8, adding the intermediate 7, the intermediate 8 and toluene into the reaction kettle, stirring and dropwise adding an ammonium persulfate solution under the conditions of the rotation speed of 200r/min and the temperature of 55 ℃ to react for 4h, and removing methanol to obtain the antibacterial agent.
Example 3
An antibacterial non-woven fabric for a mask comprises the following raw materials in parts by weight: 90 parts of PET polyester chips, 8 parts of an antibacterial agent, 2 parts of a lubricant and 7 parts of a plasticizer;
step S1: adding PET polyester chips, an antibacterial agent, a lubricant and a plasticizer into an extruder, and performing melt extrusion to obtain polyester fibers;
step S2: weaving the polyester fiber into cloth to obtain the antibacterial non-woven fabric for the mask.
The antibacterial agent is prepared by the following steps:
step A1: adding epoxy chloropropane and N, N-dimethyl dodecyl tertiary amine into a reaction kettle, reacting for 4 hours at the rotation speed of 300r/min and the temperature of 55 ℃ to obtain an intermediate 1, adding diethyl carbonate, 2-amino-2-ethyl-1, 3-propylene glycol and sodium methoxide into the reaction kettle, performing reflux reaction for 35 hours at the rotation speed of 150r/min and the temperature of 120 ℃ to obtain an intermediate 2, adding the intermediate 1, the intermediate 2 and dimethyl sulfoxide into the reaction kettle, and reacting for 3 hours at the rotation speed of 200r/min and the temperature of 60 ℃ to obtain an intermediate 3, wherein the pH value of a reaction solution is 10;
step A2: adding methacrylic acid, dimethylaminoethanol and concentrated sulfuric acid into a reaction kettle, reacting for 6 hours at the rotation speed of 300r/min and the temperature of 80 ℃ to obtain an intermediate 4, adding the intermediate 4, p-nitrobenzyl chloride, hydroquinone and acetone into the reaction kettle, performing reflux reaction for 7 hours at the temperature of 45 ℃ to obtain an intermediate 5, adding the intermediate 5, tin powder and concentrated hydrochloric acid into the reaction kettle, reacting for 3 hours at the rotation speed of 150r/min, and adjusting the pH value of a reaction solution to 10 to obtain an intermediate 6;
step A3: dissolving cyanuric chloride in acetone, stirring and adding 2,2,6, 6-tetramethyl piperidinol under the conditions of the rotation speed of 150r/min and the temperature of 5 ℃, keeping the pH value of a reaction solution at 7, adding an intermediate 6 after 5 hours of reaction, continuing to react for 3 hours under the condition of the temperature of 80 ℃ to obtain an intermediate 7, adding the intermediate 3, methacryloyl chloride, hydroquinone and chloroform into a reaction kettle, stirring and adding sodium hydroxide under the conditions of the rotation speed of 200r/min and the temperature of 40 ℃ to react for 5 hours to obtain an intermediate 8, adding the intermediate 7, the intermediate 8 and toluene into the reaction kettle, stirring and dropwise adding an ammonium persulfate solution under the conditions of the rotation speed of 300r/min and the temperature of 50 ℃ to react for 6 hours, and removing methanol to obtain the antibacterial agent.
Example 4
An antibacterial non-woven fabric for a mask comprises the following raw materials in parts by weight: 100 parts of PET polyester chips, 10 parts of an antibacterial agent, 3 parts of a lubricant and 8 parts of a plasticizer;
step S1: adding PET polyester chips, an antibacterial agent, a lubricant and a plasticizer into an extruder, and performing melt extrusion to obtain polyester fibers;
step S2: weaving the polyester fiber into cloth to obtain the antibacterial non-woven fabric for the mask.
The antibacterial agent is prepared by the following steps:
step A1: adding epoxy chloropropane and N, N-dimethyl dodecyl tertiary amine into a reaction kettle, reacting for 4 hours at the rotation speed of 300r/min and the temperature of 65 ℃ to obtain an intermediate 1, adding diethyl carbonate, 2-amino-2-ethyl-1, 3-propylene glycol and sodium methoxide into the reaction kettle, performing reflux reaction for 40 hours at the rotation speed of 200r/min and the temperature of 120 ℃ to obtain an intermediate 2, adding the intermediate 1, the intermediate 2 and dimethyl sulfoxide into the reaction kettle, and reacting for 5 hours at the rotation speed of 200r/min and the temperature of 70 ℃ to obtain an intermediate 3, wherein the pH value of a reaction solution is 10;
step A2: adding methacrylic acid, dimethylaminoethanol and concentrated sulfuric acid into a reaction kettle, reacting for 6 hours at the rotation speed of 300r/min and the temperature of 90 ℃ to obtain an intermediate 4, adding the intermediate 4, p-nitrobenzyl chloride, hydroquinone and acetone into the reaction kettle, performing reflux reaction for 7 hours at the temperature of 50 ℃ to obtain an intermediate 5, adding the intermediate 5, tin powder and concentrated hydrochloric acid into the reaction kettle, reacting for 3 hours at the rotation speed of 200r/min, and adjusting the pH value of a reaction solution to 10 to obtain an intermediate 6;
step A3: dissolving cyanuric chloride in acetone, stirring and adding 2,2,6, 6-tetramethyl piperidinol under the conditions of the rotating speed of 200r/min and the temperature of 5 ℃, keeping the pH value of a reaction solution at 8, adding an intermediate 6 after 5 hours of reaction, continuing to react for 3 hours under the condition of the temperature of 90 ℃ to obtain an intermediate 7, adding the intermediate 3, methacryloyl chloride, hydroquinone and chloroform into a reaction kettle, stirring and adding sodium hydroxide under the conditions of the rotating speed of 300r/min and the temperature of 40 ℃ to react for 7 hours to obtain an intermediate 8, adding the intermediate 7, the intermediate 8 and toluene into the reaction kettle, stirring and dropwise adding an ammonium persulfate solution under the conditions of the rotating speed of 300r/min and the temperature of 55 ℃ to react for 6 hours to remove methanol to obtain the antibacterial agent.
Comparative example 1
This comparative example uses ammonium dihydrogen phosphate instead of the antibacterial agent, as compared with example 1, and the rest of the procedure is the same.
Comparative example 2
This comparative example compares with example 1 without the addition of an antimicrobial agent and the rest of the procedure is the same.
Comparative example 3
This comparative example is a nonwoven fabric disclosed in chinese patent CN 111560140A.
The nonwoven fabrics obtained in examples 1 to 4 and comparative examples 1 to 3 were subjected to a system performance test, the test results of which are shown in table 1 below;
detecting according to GB/T20944.3-2008 to obtain initial antibacterial rate, standing the non-woven fabric at a constant temperature of 25 ℃ for 3,5 and 7 months, and detecting the antibacterial rate again.
TABLE 1
As can be seen from Table 1 above, the initial antibacterial rate against Staphylococcus aureus of the nonwoven fabrics prepared in examples 1 to 4 was 99.92 to 99.95%, the antibacterial rate against Escherichia coli was 99.89 to 99.97%, the antibacterial rate against Mycobacterium was 99.95 to 99.98%, the non-woven fabric prepared in comparative example 1 had an initial staphylococcus aureus antibacterial rate of 95.31%, an escherichia coli antibacterial rate of 96.27%, and a combined mycobacterium antibacterial rate of 92.75%, the non-woven fabric prepared in comparative example 3 had an initial staphylococcus aureus antibacterial rate of 88.62%, an escherichia coli antibacterial rate of 89.23%, and a combined mycobacterium antibacterial rate of 91.42%, the antibacterial effects of the non-woven fabrics prepared in examples 1 to 4 did not decrease after being left for 7 months, the comparative examples 1 and 3 are greatly reduced, which shows that the invention has good antibacterial effect and the normal use of the mask can not be influenced after long-time placement.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
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