CN110180260B - Air purification filter element and preparation method thereof - Google Patents
Air purification filter element and preparation method thereof Download PDFInfo
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- CN110180260B CN110180260B CN201910399733.XA CN201910399733A CN110180260B CN 110180260 B CN110180260 B CN 110180260B CN 201910399733 A CN201910399733 A CN 201910399733A CN 110180260 B CN110180260 B CN 110180260B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0471—Surface coating material
- B01D2239/0492—Surface coating material on fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
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Abstract
The embodiment of the invention provides an air purification filter element, which comprises a filter element substrate and super-hydrophobic nano paint coated on the surface and inside the filter element substrate; the filter element base material is made of a material with a fiber net structure; the super-hydrophobic nano coating comprises a mixture of fluorocarbon modified polyacrylic resin and fluorine monomers added with polyurethane and nano particles. The invention also provides a preparation method of the air filter element, which comprises the following steps: and coating the super-hydrophobic nano coating on the surface and inside of the filter element substrate in a dipping mode or a spraying mode. According to the air purification filter element, due to the super-hydrophobic property of the surface of the material, particles and bacteria and viruses are not easy to attach, and the performance attenuation speed of the air purification efficiency along with use is effectively reduced.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to an air purification filter element and a preparation method thereof.
Background
In recent years, air cleaning devices have been widely used because of the high concentration of particulate pollutants in the air caused by environmental pollution. The air filter element is used as a key component of the air purification device and is used for filtering and purifying particles with different sizes in the air. At present, most air purification filter core materials are prepared from micron fibers, and a large amount of fine particles are accumulated and attached to the surface of a filter fiber material for years, so that the ventilation efficiency is reduced, and blockage or even secondary pollution is caused in serious cases. Thus, the filter net needs to be replaced regularly and frequently, which causes the use cost of the air purifying device to increase.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are proposed to provide an air cleaning filter element and an air cleaning filter element manufacturing method that overcome or at least partially solve the above problems.
In order to solve the problems, the embodiment of the invention discloses an air purification filter element, which comprises a filter element substrate and a super-hydrophobic nano coating coated on the surface and in pores of the filter element substrate;
the super-hydrophobic nano coating comprises fluorocarbon modified polyacrylic resin, a mixture of fluorine-containing monomers for mixing, polyurethane resin and nano particles.
Further, the filter element substrate is made of a fiber net structure material;
the filter element substrate is made of materials comprising: polyester fiber, glass fiber, non-woven fabric, polypropylene paper, glass fiber paper, or a composite material of polypropylene and polycarbonate.
Further, the mass ratio of the fluorocarbon modified polyacrylic resin to the fluorine-containing monomer for mixing in the super-hydrophobic nano coating is 9:1-7: 3.
Further, the fluorocarbon modified polyacrylic resin is obtained by reacting one or more of fluorine monomers of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate with an acrylic monomer.
Further, the fluorine-containing monomer for mixing comprises one or more of perfluorodecane, perfluoroalkyl amine and perfluoroalkyl acid.
Furthermore, the mass ratio of the nano particles in the super-hydrophobic nano coating is less than 2%;
the nano particles comprise one or more of titanium dioxide, silicon dioxide and aluminum oxide.
Further, the polyurethane resin accounts for 5-10% of the super-hydrophobic nano coating by mass.
The embodiment of the invention also discloses a preparation method of the air purification filter element, which comprises the following steps:
coating the super-hydrophobic nano coating on the surface and in pores of the filter element substrate in a dipping mode or a spraying mode;
the spraying mode is a mode combining back negative pressure and front spraying.
Further, the dipping method comprises the following steps:
immersing the filter element substrate into the super-hydrophobic nano coating and keeping for 1-2 minutes;
and taking the filter element substrate which is fully soaked with the super-hydrophobic nano coating out of the super-hydrophobic nano coating, and standing for 30-60 minutes.
Further, the range of the negative pressure intensity of the back surface is 0.36-0.365kg/cm2。
The embodiment of the invention has the following advantages:
according to the air purification filter element, due to the super-hydrophobic property of the surface of the material, particles and bacteria and viruses are not easy to attach, and the performance attenuation speed of the air purification efficiency along with use is effectively reduced.
The method for preparing the air purification filter element is simple and convenient, is suitable for different filter material matrixes, endows the air purification filter element with super-hydrophobic performance through a certain coating process, can be repeatedly washed, is convenient for cleaning the filter screen in time, and reduces the maintenance cost while improving the air purification efficiency.
The negative pressure spraying mode adopted by the invention can effectively solve the limitation that the super-hydrophobic material is not uniformly and deeply sprayed, and can reduce the spraying amount of the material.
According to the air purification filter element prepared by the method, the super-hydrophobic coating is firmly combined with the filter screen base material, and the air purification filter element is resistant to water washing and long in service life.
The air filter core prepared in the invention can be repeatedly washed by water, and the purification effect is not obviously attenuated.
Drawings
FIG. 1 is a flow chart of a method of making an air purification cartridge according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for preparing an air purification filter element by using an immersion method in the embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The embodiment of the invention discloses an air purification filter element, which comprises a filter element substrate and a super-hydrophobic nano coating coated on the surface and in gaps of the filter element substrate;
the super-hydrophobic nano coating comprises fluorocarbon modified polyacrylic resin, a mixture of fluorine-containing monomers for mixing, polyurethane resin and nano particles.
In this embodiment, air purifier's filter core substrate surface and inside coating have super hydrophobic nano paint, make air purifier's filter core substrate surface and inside super hydrophobic coating that forms to reach PM2.5 or the difficult adnexed characteristic of other particulate matters, and make filter core substrate can be repeatedly washed, reach filter core substrate can recycle's technological effect.
Further, the filter element substrate is made of a fiber net structure material;
the filter element substrate is made of materials comprising: polyester fiber, glass fiber, non-woven fabric, polypropylene paper, glass fiber paper, or a composite material of polypropylene and polycarbonate.
In this embodiment, the material of making filter core substrate is the material that has reticular fiber structure, can filter most particulate matter in the air.
Further, the mass ratio of the fluorocarbon modified polyacrylic resin to the fluorine-containing monomer for mixing in the super-hydrophobic nano coating is 9:1-7: 3;
the fluorocarbon modified polyacrylic resin is obtained by reacting one or more of fluorine monomers of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate with an acrylic monomer;
the fluorine-containing monomer for mixing comprises one or more of perfluorodecane, perfluoroalkyl amine and perfluoroalkyl acid.
In this embodiment, the fluorocarbon-modified polyacrylic resin is mixed with the fluorine-containing monomer for mixing, so that the viscosity of the fluorocarbon-modified polyacrylic resin can be reduced, and the filter element substrate is prevented from being blocked; and the fluorine-containing monomer for mixing is added into the super-hydrophobic nano coating, so that the adhesive force of the coating can be increased, and the adhesive force of the fluorocarbon modified polyacrylic resin can be increased.
Furthermore, the mass ratio of the nano particles in the super-hydrophobic nano coating is less than 2%;
the nano particles comprise one or more of titanium dioxide, silicon dioxide and aluminum oxide.
In the embodiment, the nano particles are added into the super-hydrophobic nano coating to form a micro-nano structure, so that the hydrophobic property is enhanced, but the viscosity of the coating is increased, and the mass percentage of the nano particles obtained through multiple tests is lower than 2% and is more appropriate.
Further, the polyurethane accounts for 5-10% of the super-hydrophobic nano coating by mass.
In the embodiment, the polyurethane has better water resistance, in order to improve the bonding strength of the super-hydrophobic nano coating in the repeated cleaning process, a certain proportion of polyurethane is particularly required to be added, the water resistance of the coating and the adhesive force of the coating on a filter element substrate are improved, however, the hydrophobicity of the coating is influenced by adding excessive polyurethane, the water resistance of the nano coating can be ensured within the range of 5-10% by mass ratio, and the hydrophobicity of the nano coating cannot be influenced.
Further, one or more of xylene, acetone or normal hexane is added into the super-hydrophobic nano coating, so that the viscosity range of the super-hydrophobic nano coating is controlled to be kept between 50 and 200 cP.
In this embodiment, when the filter element is manufactured on site, one or more of xylene, acetone, or n-hexane needs to be added to the superhydrophobic nano-coating to control the viscosity of the coating, so as to improve the coverage rate and the infiltration rate of the coating, and multiple tests are performed to obtain that the viscosity range of the superhydrophobic nano-coating is kept between 50 cP and 200cP, so that a proper coverage rate and infiltration rate can be obtained.
The air purification filter core of this embodiment preparation, super hydrophobic coating and filter screen substrate combine firmly, and the water-fast washes, long service life.
In the embodiment, the water resistance test method of a paint film GB/T1733-93 is adopted, and the water resistance life of the paint on a substrate exceeds 170 h.
The air filter element prepared in the embodiment can be repeatedly washed by water for many times, the purification effect is not obviously attenuated, and the wind resistance is less increased.
In this embodiment, after the air purification filter element with a size of 343mmX265mmX50mm is subjected to coating treatment, dust (mainly PM 2.5), cleaning and drying processes are repeatedly performed, and after 10 times, the air purification filter element is 300m3The purification efficiency and wind resistance data under the/h air volume condition are recorded as shown in table 1:
TABLE 1
Referring to fig. 1, an embodiment of the present invention further discloses a preparation method of an air purification filter element, where the method includes:
Further, referring to fig. 2, the dipping method includes:
In this embodiment, the entire filter element substrate is immersed in the viscosity-controllable nano superhydrophobic coating for 1 to 2 minutes, then pulled out of the coating solution, and left to stand for 30 to 60 minutes to remove the excess superhydrophobic coating.
Further, the surface of the filter element substrate is coated in a mode of combining back negative pressure and front spraying in the spraying mode;
the negative pressure of the back surface is in the range of 0.36-0.365kg/cm2。
In this embodiment, carry out surface coating to the filter core substrate through the mode that back negative pressure and front spraying combined together, be favorable to super hydrophobic nanometer coating to get into filter screen micron order hole in, improve the coating area, the degree of depth that super hydrophobic coating got into to and reduce the loss of the coating in the spraying process.
In this embodiment, the back negative pressure is at the other side of the spraying, and is pumped by a vacuum pump to provide a negative pressure environment for the spraying, or a negative pressure fan or other power devices are used to form a positive flow of air, and when the front spraying is performed, the sprayed paint further enters the pores of the filter screen. The coating is formed on the surface of the filter screen and the coating is also formed on the surface of the fiber in the pores.
Furthermore, in the spraying mode, after one surface is sprayed, the other surface is sprayed.
In a specific embodiment, in the first step, 9 parts of fluorocarbon modified polyacrylic resin and 1 part of fluoromonomer of perfluorodecane and perfluoroalkylamine are combined, and are put into 10 parts of n-hexane to be stirred and mixed for 10 minutes; second, 0.05 part of SiO2And TiO2The nanoparticle mixture of (2) was placed in 10 parts of acetone for ultrasonic dispersion for 30 minutes, SiO2And TiO2The mixing ratio was 2: 7. And step three, slowly pouring the uniformly mixed and dispersed nano particle filler into the mixed resin in the step one, and stirring and mixing for 10 minutes. And fourthly, adding 3 parts of polyurethane resin and 0.5 part of isocyanate curing agent into the mixture obtained in the third step, and stirring and mixing for 30 minutes to form a milky white uniformly-mixed base material of the super-hydrophobic nano coating. When in use, acetone is added according to the control requirement of viscosity to adjust the viscosity of the sprayed super-hydrophobic coating, the viscosity is finally controlled at 100cP, and the coating is kept stand for later use.
Next, the air filter element to be sprayed is placed on a negative pressure spraying device, a negative pressure fan provides negative pressure, and the pressure is 0.36kg/cm2. Pouring the prepared super-hydrophobic nano paint into a material spraying pot. The aperture of the material spraying kettle is 0.6mm, and the spraying pressure is 0.1 mpa. After uniformly spraying for 1 time, the mixture is changed to be emptyAnd the air filter element is sprayed on the other surface.
After the spraying is finished, the air purification filter element sprayed with the super-hydrophobic material is placed into a 50 ℃ oven, dried and cured for 2 hours, and taken out.
In another specific example, in the first step, 9 parts of fluorocarbon-modified polyacrylic resin and 1 part of fluoromonomer of perfluorodecane and perfluoroalkylamine are combined, and then placed into 10 parts of n-hexane to be stirred and mixed for 10 minutes; second, 0.05 part of SiO2And TiO2The nanoparticle mixture of (2) was placed in 10 parts of acetone for ultrasonic dispersion for 30 minutes, SiO2And TiO2The mixing ratio was 2: 7. And step three, slowly pouring the uniformly mixed and dispersed nano particle filler into the mixed resin in the step one, and stirring and mixing for 10 minutes. And fourthly, adding 3 parts of polyurethane resin and 0.5 part of isocyanate curing agent into the mixture obtained in the third step, and stirring and mixing for 30 minutes to form a milky white uniformly-mixed base material of the super-hydrophobic nano coating. When in use, acetone is added according to the control requirement of viscosity to adjust the viscosity of the sprayed super-hydrophobic coating, the viscosity is finally controlled at 100cP, and the coating is kept stand for later use.
And then, standing the air filter element to be sprayed in the prepared super-hydrophobic nano coating for 2 minutes, pulling and taking out the filter element, and standing for 45 minutes to remove the redundant super-hydrophobic nano coating. And (3) putting the air purification filter element coated with the super-hydrophobic material into a 50 ℃ oven, drying and curing for 2 hours, and taking out.
The method for preparing the washable and recyclable air purification filter element in the embodiment is simple and convenient, is suitable for different filter material matrixes, endows the air purification filter element with super-hydrophobic performance through a certain coating process, can be repeatedly washed, is convenient for timely cleaning the filter screen, and reduces the maintenance cost while improving the air purification efficiency.
The negative pressure spraying mode adopted by the embodiment can effectively solve the limitation that the super-hydrophobic material is not uniformly sprayed and is not deep, and meanwhile, the spraying amount of the material can be reduced.
The air purification filter core of preparation in this embodiment is because the super hydrophobic property on material surface for particulate matter and bacterium virus are difficult for adhering to, and the effectual performance decay rate that has reduced air purification efficiency along with the use.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The air purification filter element and the preparation method thereof provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. The air purification filter element is characterized by comprising a filter element substrate and super-hydrophobic nano paint coated on the surface and in pores of the filter element substrate;
the super-hydrophobic nano coating is a mixture comprising fluorocarbon modified polyacrylic resin, a mixed fluorine-containing monomer, polyurethane resin and nano particles; wherein the mass ratio of the fluorocarbon modified polyacrylic resin to the mixed fluorine-containing monomer in the super-hydrophobic nano coating is 9:1-7: 3;
the fluorine-containing monomer for mixing comprises one or more of perfluorodecane, perfluoroalkyl amine and perfluoroalkyl acid.
2. The filter element of claim 1, wherein the filter element substrate is made of one of polyester fiber, glass fiber, non-woven fabric, polypropylene paper, glass fiber paper, polypropylene and polycarbonate composite material.
3. The filter element of claim 1, wherein the fluorocarbon-modified polyacrylic resin is obtained by reacting one or more of fluoromonomers hexafluorobutyl acrylate, hexafluorobutyl methacrylate, and dodecafluoroheptyl acrylate with an acrylic monomer.
4. The filter element of claim 1, wherein the nano particles account for less than 2% of the super-hydrophobic nano coating by mass;
the nano particles comprise one or more of titanium dioxide, silicon dioxide and aluminum oxide.
5. The filter element of claim 1, wherein the polyurethane resin accounts for 5-10% of the super-hydrophobic nano coating by mass.
6. The method of making an air purification cartridge of claim 1, wherein the method comprises:
coating the super-hydrophobic nano coating on the surface and in pores of the filter element substrate in a dipping mode or a spraying mode;
the spraying mode is a mode combining back negative pressure and front spraying.
7. The method of claim 6, wherein the impregnating comprises:
immersing the filter element substrate into the super-hydrophobic nano coating and keeping for 1-2 minutes;
and taking the filter element substrate which is fully soaked with the super-hydrophobic nano coating out of the super-hydrophobic nano coating, and standing for 30-60 minutes.
8. The method of claim 7, wherein the back side negative pressure is in the range of 0.36-0.365kg/cm2。
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| CN111135789B (en) * | 2019-12-13 | 2022-05-27 | 上海勇意环境工程有限公司 | 360-degree flexible air purification material and preparation method thereof |
| CN114712940B (en) * | 2022-03-22 | 2023-09-26 | 南通康净环保科技有限公司 | Air purification filter element material and preparation process thereof |
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