1. An antibacterial suction nozzle is made of a PCTG material, and is characterized in that the PCTG material contains the following raw material components in parts by weight:

100 parts of PCTG granules

0.1 to 1.5 portions of nano silver ion antibacterial agent

Wherein the nano silver ion antibacterial agent is a modified oleophobic nano silver ion antibacterial agent.

2. The antimicrobial mouthpiece of claim 1, wherein the modified oleophobic nanosilver ion antimicrobial is a nanosilver ion antimicrobial modified with an aliphatic perfluoroorganic.

3. The antimicrobial mouthpiece of claim 2, wherein the aliphatic perfluororganic is perfluorooctyltrimethoxysilane, perfluorodecylacrylate, or perfluorododecyltrichlorosilane.

4. The antibacterial mouthpiece of claim 1, wherein the PCTG material further contains 0.01 to 0.1 parts by weight of a colorant.

5. A method for manufacturing an antibacterial suction nozzle comprises the following steps:

modification: uniformly dispersing the nano silver ion antibacterial agent into an organic solvent to form a suspension, dropwise adding an aliphatic perfluorinated organic substance into the suspension, soaking for 10-15 hours, evaporating to remove the solvent, and drying to obtain a modified nano silver ion antibacterial agent;

mixing materials: respectively taking dry PCTG granules and a modified nano silver ion antibacterial agent according to the weight part ratio of 100: (0.1-1.5), and uniformly mixing;

molding: and (3) putting the mixed materials into an injection molding machine, and performing extrusion molding by using a suction nozzle mold according to a conventional injection molding process to obtain the antibacterial suction nozzle.

6. The method according to claim 5, wherein 0.01 to 0.1 part by weight of a coloring agent is further added in the mixing step.

7. The method according to claim 5, wherein the organic solvent is absolute ethanol, isopropyl alcohol, acetone, or ethylene glycol.

8. The method according to claim 5, wherein the aliphatic perfluoroorganic is perfluorooctyltrimethoxysilane, perfluorodecylacrylate, or perfluorododecyltrichlorosilane.

9. An electronic atomizing device characterized by having the antibacterial mouthpiece according to any one of claims 1 to 4.

[ background of the invention ]

Because the electronic atomizer can not be used up in a short time after being opened due to the fact that the electronic atomizer is contacted with saliva of people, the storage scenes are various, the electronic atomizer is the most easily bred with bacteria and viruses, the sanitation and safety of users are seriously threatened, and the material of the suction nozzle is usually plastic, metal, wood, glass, ceramic and the like. At present, the sterilization and disinfection of the suction nozzle are usually carried out in an external mode, for example, the suction nozzle is sterilized by ultraviolet rays or ozone, but the risk of being damaged by the ultraviolet rays or the ozone exists during the operation of a user, and the repeated operation is tired, so that the user experience is not good; in another mode, titanium dioxide photocatalyst materials are coated on base materials such as stainless steel and the like to serve as antibacterial coatings, but the titanium dioxide photocatalyst materials cannot play a role in the dark or low-light environment at night; the method also adopts hollow porous ZnO as a foaming auxiliary agent of the foaming material, and inhibits the generation of bacteria by means of 'absorption of light by large specific surface area and color refraction in particles to generate active oxygen or active zinc ions', which also belongs to an antibacterial agent in the field of photocatalyst and has the defect that the effect cannot be exerted in a dark environment; in the other way, the surface of the suction nozzle is coated with the antibacterial agent layer and the inner surface of the suction nozzle sleeve is coated with the disinfectant, but the problem that the antibacterial agent layer or the disinfectant layer falls off during suction exists.

PCTG is currently the most commonly used material for electronic atomizer nozzles. PCTG is a non-crystalline copolyester, and a common comonomer used in PCTG is 1, 4-Cyclohexanedimethanol (CHDM), which is collectively known as poly (ethylene terephthalate) -1, 4-cyclohexanedimethanol ester. The PCTG is a product obtained by Polycondensing Terephthalic Acid (PTA), Ethylene Glycol (EG) and 1, 4-Cyclohexanedimethanol (CHDM) through a transesterification method, the melting point is reduced, the glass transition temperature is increased, the crystallinity is reduced along with the increase of CHDM in the copolymer, and finally an amorphous polymer is formed, wherein the content of CHDM in the PCTG is more than 50%.

The PCTG material passes the food contact standard of the FDA in the United states, and can be applied to the fields of food, medicine, cosmetic packaging and the like. However, the nozzle of the PCTG electronic atomizer is hydrophilic and oleophilic, and bacteria and viruses are easy to breed on the surface. The PCTG electronic atomizer suction nozzle with the functions of resisting bacteria and inhibiting toxicity is developed, and the sanitary safety of the electronic atomizer can be improved. However, PCTG materials soften at 100 ℃, the high temperature treatment process used to apply the photocatalyst coating can cause deformation of the PCTG mouthpiece, and the disinfectant coating can easily fall off when the disinfectant is applied.

Silver ions have been widely used as an antibacterial agent added to other materials to form antibacterial materials. For PCTG materials, the antibacterial effect of the materials is not obvious after a small amount of nano silver ion antibacterial agent is doped, but if a large amount of nano silver ion antibacterial agent is doped in the PCTG materials, the material cost is increased, the mechanical property of the PCTG materials is also reduced, and the finished products are brittle.

Therefore, it is necessary to develop a PCTG mouthpiece and an electronic atomizer having a self-antibacterial function, which can achieve high activity by adding a small amount of silver ion antibacterial agent.

[ summary of the invention ]

The invention aims to provide an antibacterial suction nozzle so as to achieve the aim of keeping the mechanical property of a suction nozzle material and having a high-activity self-antibacterial function.

In order to achieve the above purpose, the invention provides the following technical scheme:

the antibacterial suction nozzle is made of a PCTG material, and the PCTG material contains the following raw material components in parts by weight:

100 parts of PCTG granules

0.1 to 1.5 portions of nano silver ion antibacterial agent

Wherein the nano silver ion antibacterial agent is a modified oleophobic nano silver ion antibacterial agent; the nano silver ion antibacterial agent can be provided in the form of powder or master batch containing powder.

Furthermore, the modified oleophobic nano silver ion antibacterial agent is a nano silver ion antibacterial agent modified by aliphatic perfluorinated organic compounds.

Further, the aliphatic perfluoroorganic is perfluorooctyltrimethoxysilane, perfluorodecylacrylate, or perfluorododecyltrichlorosilane.

Further, the PCTG material also contains 0.01-0.1 part by weight of colorant; the colorant may be provided in the form of a toner or a color concentrate.

The invention also provides a preparation method of the antibacterial suction nozzle, which comprises the following steps:

modification: uniformly dispersing the nano silver ion antibacterial agent into an organic solvent to form a suspension, dropwise adding an aliphatic perfluorinated organic substance into the suspension, soaking for 10-15 hours, evaporating to remove the solvent, and drying to obtain a surface-modified oleophobic nano silver ion antibacterial agent;

mixing materials: respectively taking dry PCTG granules and the surface-modified oleophobic nano silver ion antibacterial agent according to the weight part ratio of 100: (0.1-1.5), and uniformly mixing;

molding: and (3) putting the mixed materials into an injection molding machine, and performing extrusion molding by using a suction nozzle mold according to a conventional injection molding process to obtain the antibacterial suction nozzle.

Further, the aliphatic perfluoroorganic is perfluorooctyltrimethoxysilane, perfluorodecylacrylate, or perfluorododecyltrichlorosilane

Further, the organic solvent is absolute ethanol, isopropanol, acetone, or ethylene glycol.

Further, the aliphatic perfluoroorganic is perfluorooctyltrimethoxysilane, perfluorodecylacrylate, or perfluorododecyltrichlorosilane.

Further, 0.01-0.1 part by weight of a coloring agent is added in the material mixing step; the colorant may be provided in the form of a toner or a color concentrate.

The invention further provides an electronic atomization device which comprises the antibacterial suction nozzle.

The surface of a silver-containing compound in the nano silver ion antibacterial agent is modified and an oleophobic group is modified by a surface modification technology, a small amount of the modified nano silver ion antibacterial agent is uniformly doped into a PCTG material, and then the modified nano silver ion antibacterial agent and the PCTG material are co-injected to form the suction nozzle. The mechanism is that the silver-containing compound in the antibacterial agent in the PCTG material is repelled by the PCTG and the oily group in the organic toner or the color master due to the oleophobic group on the surface, the silver-containing compound is gradually separated from the surface of the antibacterial agent inorganic carrier uniformly doped in the PCTG material and continuously migrates from inside to outside through the movement of microscopic molecules, and is enriched on the surface of the PCTG material, so that the concentration of the silver-containing compound on the surface of the PCTG material is improved, namely the effective concentration and the antibacterial activity of nano silver ions on the surface of a finished sucker product are improved; the inorganic carrier without the silver-containing compound is larger than the silver-containing compound in volume, cannot migrate outwards along with the silver-containing compound and is still uniformly distributed in the PCTG material.

The technical scheme of the invention has the advantages that: the silver-containing compound can be separated from the surface of the antibacterial inorganic carrier uniformly doped into the material and migrate outwards in the later period by a surface modification technology, and the silver-containing compound can be gradually enriched to the surface of PCTG after a small amount of nano silver ion antibacterial agent is doped into the PCTG material and the PCTG material is subjected to common injection molding. For the prepared suction nozzle finished product, the effective concentration of nano silver ions and the antibacterial and antivirus activity of the PCTG are improved, and the mechanical property and the finished product property of the PCTG material are not influenced.

According to the technical scheme provided by the invention, the modified nano silver ion antibacterial agent is dispersed into a PCTG particle raw material, then the PCTG suction nozzle with antibacterial and toxicity-inhibiting effects is prepared by injection molding, and then the PCTG suction nozzle is applied to an electronic atomizer_，The electronic atomizer effectively solves the problem of sanitation and safety of the electronic atomizer in the prior art in a low-cost and high-activity mode. Meanwhile, the coloring agent is doped into the PCTG particle raw material to manufacture the colorful PCTG antibacterial suction nozzle, so that the product diversity and the user acceptance are improved.

[ detailed description ] embodiments

The invention is further described below with reference to examples, comparative examples and test data.

COMPARATIVE EXAMPLE 1 (silver-free blank)

Taking the dried PCTG granules and the brown toner according to the mass ratio of 100: 0.05, then feeding the mixture into an injection molding machine, and extruding a plurality of suction nozzle samples without the antibacterial agent by virtue of a suction nozzle mold and a conventional injection molding process to be used as blank samples without the nano-silver antibacterial agent.

Comparative example 2 (commercial silver-containing unmodified)

The silver-containing compound of the antibacterial agent is silver nitrate, the carrier is zirconium phosphate with the grain diameter of 50-6000nm, and the mass percentage of nano silver ions is 1%. The nano silver ion antibacterial agent, the dried PCTG granules and the brown toner are mixed according to the mass ratio of 0.1: 100: 0.01, then feeding the mixture into an injection molding machine, and extruding a plurality of tawny suction nozzle samples by means of a suction nozzle mold and a conventional injection molding process.

Comparative example 3 (homemade silver-containing unmodified)

Self-made zirconium phosphate carrier nano silver ion antibacterial agent powder: dispersing 99 g of zirconium phosphate with the particle size of 50-6000nm into 500 ml of deionized water, adding 1.58 g of solid silver nitrate, wherein the mass ratio of the zirconium phosphate to silver ions is 99:1, stirring until the silver nitrate is completely dissolved, separating out an aqueous solvent by using a rotary evaporator to enable the silver nitrate to be uniformly adsorbed on the surfaces of zirconium phosphate particles, taking out the zirconium phosphate particles, drying the zirconium phosphate particles for 2 hours at 60 ℃, sintering the zirconium phosphate particles in a muffle furnace at 200 ℃ for 60 minutes, and grinding the zirconium phosphate particles to enable the silver nitrate to be fixedly loaded on the surfaces of the zirconium phosphate particles to form the nano silver ion antibacterial agent, wherein the mass percentage of the silver ions in the antibacterial agent is 1%. The self-made nano silver ion antibacterial agent, the dried PCTG granules and the gray toner are mixed according to the mass ratio of 0.8: 100: 0.05, then feeding the mixture into an injection molding machine, and extruding a plurality of colorless suction nozzle samples by means of a suction nozzle mold and a conventional injection molding process.

Comparative example 4 (homemade silver-containing unmodified)

The nano silver ion antibacterial agent powder using self-made calcium carbonate as a carrier comprises the following components: dispersing 99 g of calcium carbonate with the particle size of 20-8000nm into 500 ml of deionized water, adding 1.58 g of solid silver nitrate, wherein the mass ratio of the calcium carbonate to silver ions is 99:1, stirring until the silver nitrate is completely dissolved, separating out a water solvent by using a rotary evaporator, enabling the silver nitrate to be uniformly adsorbed on the surfaces of calcium carbonate particles, taking out, drying at 60 ℃ for 2 hours, then placing in a muffle furnace, sintering at 200 ℃ for 60 minutes, and grinding to enable the silver nitrate to be immobilized on the surfaces of the calcium carbonate to form a nano silver ion antibacterial agent, wherein the mass percentage content of the silver ions in the antibacterial agent is 1%. The self-made nano silver ion antibacterial agent, the dried PCTG granules and the pink toner are mixed according to the mass ratio of 1.6: 100: 0.1, then feeding the mixture into an injection molding machine, and extruding a plurality of gray suction nozzle samples by means of a suction nozzle mold and a conventional injection molding process.

Example 1

Taking 100 g of the above commercially available nano silver ion antibacterial agent powder (containing 1 g of silver ions) taking zirconium phosphate as a carrier, uniformly dispersing the powder into 1000 ml of absolute ethanol under mechanical stirring to form a suspension, then adding 4.34 g of perfluorooctyl trimethoxy silane as an oleophobic modifier into the suspension, wherein the molar ratio of the oleophobic modifier to the silver ions in the antibacterial agent powder is 1: 1, after dipping for 12 hours, separating absolute ethyl alcohol by using a rotary evaporator to obtain the oleophobic nano silver ion antibacterial agent with the modified surface. Taking the oleophobic nano silver ion antibacterial agent, dried PCTG granules and brown toner according to the mass ratio of 0.1: 100: 0.01, then feeding the mixture into an injection molding machine, and extruding a plurality of tawny suction nozzle samples by means of a suction nozzle mold and a conventional injection molding process.

Example 2

Taking 100 g of the self-made nano silver ion antibacterial agent powder (containing 1 g of silver ions) taking zirconium phosphate as a carrier, uniformly dispersing the self-made nano silver ion antibacterial agent powder into 1000 ml of isopropanol under mechanical stirring to form suspension, then adding 4.80 g of perfluorodecyl acrylate serving as an oleophobic modifier into the suspension, wherein the molar ratio of the oleophobic modifier to the silver ions in the antibacterial agent powder is 1: 1, after dipping for 12 hours, separating absolute ethyl alcohol by using a rotary evaporator to obtain the oleophobic nano silver ion antibacterial agent with the modified surface. Taking the oleophobic nano silver ion antibacterial agent, dried PCTG granules and gray toner according to the mass ratio of 0.8: 100: 0.05, then feeding the mixture into an injection molding machine, and extruding a plurality of colorless suction nozzle samples by means of a suction nozzle mold and a conventional injection molding process.

Example 3

Taking 100 g of the nano silver ion antibacterial agent powder (containing 1 g of silver ions) taking the commercially available calcium carbonate as the carrier, uniformly dispersing the nano silver ion antibacterial agent powder into 1000 ml of acetone under mechanical stirring to form suspension, then adding 5.38 g of perfluorododecyl trichlorosilane as an oleophobic modifier into the suspension, wherein the molar ratio of the oleophobic modifier to the silver ions in the antibacterial agent powder is 1: and 1, after dipping for 12 hours, separating out acetone by using a rotary evaporator to obtain the oleophobic nano silver ion antibacterial agent with the modified surface. Taking the oleophobic nano silver ion antibacterial agent, dried PCTG granules and pink toner according to the mass ratio of 1.5: 100: 0.1, then feeding the mixture into an injection molding machine, and extruding a plurality of gray suction nozzle samples by means of a suction nozzle mold and a conventional injection molding process.

Suction nozzle mechanical performance evaluation method

And (3) flatly placing the suction nozzle sample on the lower part of the mechanical pressing machine, gradually applying pressure to extrude the suction nozzle, flatly flattening the suction nozzle until the upper surface and the lower surface of the original maximum opening of the suction nozzle are contacted together, keeping for 1 minute, removing the pressure, and observing the deformed suction nozzle by human eyes. Performing parallel sampling inspection on 8 suction nozzle samples, and judging that the mechanical properties are qualified when the suction nozzles are not damaged or cracked; the samples are regarded as unqualified when 1 or more than 1 breakage or crack occurs in 8 parallel samples; the 8 parallel samples were deemed marginal for 1 and more severe cracks but no cracks.

Antibacterial performance evaluation method

After the nozzle samples of comparative examples 1 to 4 and examples 1 to 3 were manufactured by an injection molding machine, the flat mold was replaced and the above materials were used to injection mold 50mm × 50mm × 2mm square sheets of PCTG antibacterial material, according to the national standard GB-T31402-2015, test method for plastic surface antibacterial performance, respectively culturing staphylococcus aureus ATCC6538, escherichia coli 8099 and candida albicans ATCC10231 on the surfaces of the seven PCTG material sheets, respectively comparing the number of the active bacteria on the surface of the sample after 24 hours, and according to the WS/T650-plus 2019 standard of the sanitary industry of the people's republic of China, the evaluation method of the antibacterial and bacteriostatic effects, the antibacterial performance of the above samples was evaluated, i.e.,% antibacterial activity ═ 24h blank average viable count-24 h test group average viable count ÷ 24h blank average viable count × 100%. As the materials are the same, the antibacterial performance on a 50mm multiplied by 2mm cube PCTG material slice can be completely equal to the antibacterial performance on the surface of the suction nozzle.

The results of the antimicrobial performance tests are shown in the following tables:

table 1: antibacterial effectiveness of antibacterial mouthpiece against Staphylococcus aureus ATCC6538

Table 2: antibacterial rate of antibacterial mouthpiece to Escherichia coli 8099

Table 3: antibacterial rate of Candida albicans ATCC10231

As can be seen from the experimental data in tables 1-3, firstly, the PCTG mouthpiece containing the nano silver ion antibacterial agent has stronger antibacterial and bacteriostatic effects compared with the common PCTG mouthpiece without the antibacterial agent; secondly, according to the scheme of the invention, when the nano silver ion antibacterial agent is subjected to oleophobic modification in advance and then is doped into the PCTG suction nozzle, under the condition of the same addition amount, the antibacterial performance of the nano silver ion antibacterial agent is obviously superior to that of the PCTG suction nozzle of the unmodified nano silver ion antibacterial agent; thirdly, as can be seen from the data in the table, if the doping proportion of the unmodified nano silver ion antibacterial agent is continuously increased, the PCTG suction nozzle can also obtain higher antibacterial effect, but the mechanical performance of the suction nozzle is unqualified, so that the product is brittle and fragile; however, under the same addition amount, after the modified nano silver ion antibacterial agent provided by the invention is doped into PCTG, the antibacterial performance is obviously improved, and simultaneously, the better mechanical performance can be still maintained. The data also prove that after a small amount of super-oleophobic modified silver ion antibacterial agent is doped in the PCTG, the silver ions in the suction nozzle can gradually migrate and concentrate to the surface, the silver ion concentration on the surface of the suction nozzle is improved, the mechanical performance of the suction nozzle is not influenced, and the PCTG suction nozzle and the electronic atomizer which have high activity and self-antibacterial function can be obtained.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, substitutions and alterations can be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.