CN111205498A - Preparation method of electrostatic conductive ink/polypropylene dust collecting plate - Google Patents
Preparation method of electrostatic conductive ink/polypropylene dust collecting plate Download PDFInfo
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Abstract
The invention discloses a preparation method of an electrostatic conductive ink/polypropylene dust collecting plate, which comprises the steps of firstly carrying out surface oxidation treatment on a polypropylene plastic plate, then synthesizing carbon conductive ink by utilizing a carbon nano tube and a hydroxyl carbon nano tube, finally coating the prepared conductive ink on the polypropylene plastic plate as a conductive material, and obtaining the novel electrostatic conductive ink/polypropylene dust collecting plate through self-assembly. The method is simple and reliable, safe and environment-friendly, and the prepared electrostatic dust collecting plate has low cost, good conductivity and water resistance, realizes good electrostatic dust collecting efficiency, and provides a practical reference for the feasibility of applying the carbon-series conductive material to the electrostatic dust collecting technology.
Description
Technical Field
The invention belongs to the field of dust collecting plate preparation, and particularly relates to a preparation method of a novel electrostatic conductive ink/polypropylene dust collecting plate.
Background
In recent years, with the rapid development of socioeconomic performance, more and more production, life and the like can be performed indoors. Therefore, indoor air pollution has attracted much attention. The electrostatic air purifier has the advantages of safety, high efficiency and the like, and has extremely high commercial value due to low energy consumption, high dust removal efficiency and long service life. The traditional electrostatic dust collecting plate is mainly formed by assembling a plurality of layers of perforated metal sheets, but has high one-time manufacturing cost and easy generation of electric leakage and is gradually replaced by electret materials. At present, the dust collecting plate generally applies conductive paint or conductive plate to make the surface of the substrate conductive, and uses corona discharge to charge dust particles in the air, and then the charged particles are attached to the collecting electrode under the action of electric field force, thereby achieving the dust removing and purifying effect.
Although electrostatic air purifiers have many advantages, there are still some disadvantages. For example:
(1) for a filter air purifier, the filtration efficiency depends on the dust conductivity and the amount of dust collected; the fine particles are filtered and removed efficiently, but the pressure drop required by the filter is increased, and meanwhile, the energy consumption is high and the maintenance cost is high;
(2) the accumulated dust and chemical contamination reduces the ability of the corona electrode to generate ions; the dust collecting plate needs to be cleaned or replaced frequently after being used for a period of time, and the cost is high at one time;
(3) the traditional electrostatic air purifier takes a metal plate as a dust collecting plate, although the required pressure is reduced, the collection and the cleaning are convenient and the energy consumption is small, the phenomena of electric breakdown and electric leakage exist in the using process, and the phenomenon of ozone generation is serious;
(4) the price of the conductive material of the dust collecting plate is high; frequent sparking and arcing reduce the filtration efficiency and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a novel electrostatic conductive ink/polypropylene dust collecting plate, so as to solve the defects of high one-time manufacturing cost and easy electric leakage of the traditional electrostatic dust collecting plate. The carbon-based conductive material is adopted to coat the polypropylene dust collecting plate to replace the traditional conductive coating, so that the electrostatic dust collection efficiency is improved, the problems of poor water washing resistance, high cost and the like of the traditional dust collecting plate are effectively solved, and the theory and application foundation is laid for the development of the electrostatic air purifier in the future.
The invention relates to a preparation method of an electrostatic conductive ink/polypropylene dust collecting plate, which comprises the following steps:
(1) ultrasonically cleaning a polypropylene plastic plate by using a sodium dodecyl benzene sulfonate solution, and then washing by using water;
(2) carrying out surface oxidation treatment on the polypropylene plastic plate obtained in the step (1) by using a potassium permanganate/sulfuric acid solution, pickling, washing with water and drying;
(3) coating conductive ink on the polypropylene plastic plate dried in the step (2), and drying in an oven to obtain the polypropylene plastic plate with the conductive material on the surface;
(4) and (4) stacking the polypropylene plastic boards obtained in the step (3) up and down to form a gas channel, sequentially arranging the conductive materials on the parity layers in the display channel in a staggered manner according to the direction, and connecting the two ends of the conductive materials by stainless steel conduction bands to finally obtain the electrostatic type air purifier dust collecting board.
The ultrasonic cleaning in the step (1) comprises the following steps: and ultrasonically cleaning the glass substrate for 10-30min by using a sodium dodecyl benzene sulfonate solution with the mass fraction of 20%.
The water washing in the step (1) comprises the following steps: ultrasonically cleaning with acetone and water at a volume ratio of 1-1.5:1 for 10-30 min.
In the step (2), the potassium permanganate/sulfuric acid solution consists of 0.3mol/L potassium permanganate and 0.1mol/L sulfuric acid, and the volume ratio of the potassium permanganate to the sulfuric acid is 0.8-1.2: 1.
The time of the surface oxidation treatment in the step (2) is 6-8h, and the temperature is 60-80 ℃.
The acid washing in the step (2) comprises the following steps: pickling with saturated oxalic acid solution for 5-20 min; the water washing comprises the following steps: washing with deionized water for 5-10 min; the drying comprises the following steps: drying in a vacuum oven at 40-60 deg.C.
The preparation method of the conductive ink in the step (3) comprises the following steps: dissolving epoxy resin and polyamide resin in ethanol and glycerol solution, and stirring at room temperature at 100 rpm for 10-30 min; then sodium dodecylbenzene sulfonate is added as a dispersant. After fully mixing, stirring the mixture for 1-2h at the temperature of 80-100 ℃; after the resin is fully dissolved, slowly adding the carbon nano tube and the hydroxyl carbon nano tube, and continuously stirring for 1-3h at the speed of 100 revolutions per minute; wherein the proportion of the epoxy resin, the polyamide resin, the ethanol, the glycerol, the sodium dodecyl benzene sulfonate, the carbon nano tube and the hydroxyl carbon nano tube is 10-15 g: 5-10 g: 5-10 ml: 1-5 ml: 1-5 g: 1-3 g: 1-5 g.
The drying conditions of the oven in the step (3) are as follows: drying in a vacuum oven at 40-60 deg.C.
And (4) connecting the two ends by a 304 stainless steel conduction band.
According to the invention, a layer of uniform carbon-based conductive ink with good binding force is coated on the polypropylene dust collecting plate to serve as a conductive material, and the dust collecting efficiency of the prepared dust collecting plate is tested by combining an electrostatic dust collection testing device. The result shows that the conductive ink adopted by the invention is used as the conductive material of the dust collecting plate, thereby not only reducing the cost, but also controlling the conductivity within the required range and improving the dust collecting efficiency. Meanwhile, the problems of poor water washing resistance, high cost and the like of the traditional dust collecting plate are effectively solved. The beneficial effects achieved are:
(1) the dust collecting plate has the advantages of low cost, high dust collecting efficiency and excellent water washing resistance;
(2) the carbon-based conductive ink is adopted to replace the traditional conductive coating, so that the cost is reduced, and the conductivity of the conductive ink is controlled within a required range; meanwhile, the conductive ink has mild synthesis conditions, and is safe and environment-friendly.
Drawings
FIG. 1 is a schematic view of an electrostatic precipitator plate;
FIG. 2 is a schematic view showing the structure of the dust collecting plate in examples 1 and 3;
FIG. 3 is a schematic view showing the structure of a dust collecting plate in example 2;
FIG. 4 is a schematic view showing the structure of the electrostatic precipitator plates stacked up and down alternately to form an air flow path according to the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In the embodiment of the invention, the used polypropylene plate is purchased from Guanghui technology limited, the used carbon nanotube is purchased from Shenzhen nanotechnology limited, and the hydroxyl carbon nanotube is purchased from Beijing Boyu Gaokou new material technology limited. Other chemicals used in the experiments were purchased from national pharmaceutical chemicals, ltd. All chemicals were analytically pure and no further purification was required during use.
Example 1
(1) Pretreatment
a. Taking a 16cm multiplied by 5cm polypropylene plate, and ultrasonically cleaning the polypropylene plate for 30min by using a sodium dodecyl benzene sulfonate solution with the mass fraction of 20%; then ultrasonically cleaning the mixture in acetone and water for 20min, wherein the volume ratio of the acetone to the water is 1: 1;
b. respectively weighing 4.74g of potassium permanganate solid powder and 0.55mL of 98% sulfuric acid, adding water to dilute the solid powder and the 0.55mL of 98% sulfuric acid to 100mL, and then mixing the two solutions to obtain an oxidation treatment solution;
c. immersing the treated polypropylene plate into the oxidation treatment liquid, and sealing the beaker button by using a plastic film;
d. placing the beaker in a constant-temperature magnetic stirring water bath, and treating for 7h at 60 ℃;
e. after the reaction is finished, taking out the polypropylene plate, pickling the polypropylene plate for 10min by using a saturated oxalic acid solution, washing the polypropylene plate for 10min by using deionized water, and drying the polypropylene plate in a vacuum oven at 60 ℃;
(2) synthetic conductive ink
f. Dissolving 14g of epoxy resin and 8g of polyamide resin in 10ml of ethanol and 5ml of glycerol solution, and stirring at room temperature at the rate of 100 revolutions per minute for 20 min; then 1g of sodium dodecylbenzenesulfonate was added as a dispersant. After thorough mixing, the mixture was stirred at 90 ℃ for 1 h; after the resin is fully dissolved, slowly adding 1g of carbon nano tube and 2.5g of hydroxyl carbon nano tube, and continuously stirring for 2 hours at the speed of 100 revolutions per minute;
(3) dust collecting plate preparation and assembly
g. Covering the front surface of the polypropylene plate with an adhesive tape, wherein the middle of the polypropylene plate is 11cm in length and 1.5cm in width, and the polypropylene plate is left empty and used for coating conductive ink;
h. placing the prepared polypropylene plate coated with the conductive ink in a vacuum oven at 60 ℃ for drying to obtain a polypropylene dust collecting plate with a conductive material on the surface;
i. stacking the polypropylene plates up and down, wherein the conductive material direction of the odd-numbered polypropylene plates faces to the left, and the conductive material direction of the even-numbered polypropylene plates faces to the right, and the polypropylene plates are sequentially staggered;
j. connecting the left end and the right end of the polypropylene plate by two stainless steel conduction bands respectively to form a conductive path;
k. the distance between every two polypropylene dust collecting plates is 0.5 cm;
testing the dust collection efficiency of the dust collection plate in a self-assembled electrostatic precipitation testing device. At a wind speed of 0.5m/s, for PM2.5The dust collection efficiency is as high as 93.85%.
Example 2
(1) Pretreatment
a. Taking a 16cm multiplied by 5cm polypropylene plate, and ultrasonically cleaning the polypropylene plate for 30min by using a sodium dodecyl benzene sulfonate solution with the mass fraction of 20%; then ultrasonically cleaning the mixture in acetone and water for 20min, wherein the volume ratio of the acetone to the water is 1: 1;
b. respectively weighing 4.74g of potassium permanganate solid powder and 0.55mL of 98% sulfuric acid, adding water to dilute the solid powder and the 0.55mL of 98% sulfuric acid to 100mL, and then mixing the two solutions to obtain an oxidation treatment solution;
c. immersing the treated polypropylene plate into the oxidation treatment liquid, and sealing the beaker button by using a plastic film;
d. placing the beaker in a constant-temperature magnetic stirring water bath, and treating for 7h at 60 ℃;
e. after the reaction is finished, taking out the polypropylene plate, pickling the polypropylene plate for 10min by using a saturated oxalic acid solution, washing the polypropylene plate for 10min by using deionized water, and drying the polypropylene plate in a vacuum oven at 60 ℃;
(2) synthetic conductive ink
f. Dissolving 14g of epoxy resin and 8g of polyamide resin in 10ml of ethanol and 5ml of glycerol solution, and stirring at room temperature at the rate of 100 revolutions per minute for 20 min; then 1g of sodium dodecylbenzenesulfonate was added as a dispersant. After thorough mixing, the mixture was stirred at 90 ℃ for 1 h; after the resin is fully dissolved, slowly adding 1g of carbon nano tube and 2.5g of hydroxyl carbon nano tube, and continuously stirring for 2 hours at the speed of 100 revolutions per minute;
(3) dust collecting plate preparation and assembly
g. Covering the front surface of the polypropylene plate with an adhesive tape, wherein the middle of the polypropylene plate is 11cm in length and 5cm in width, and leaving a space for coating conductive ink;
h. placing the prepared polypropylene plate coated with the conductive ink in a vacuum oven at 60 ℃ for drying to obtain a polypropylene dust collecting plate with a conductive material on the surface;
i. stacking the polypropylene plates up and down, wherein the conductive material direction of the odd-numbered polypropylene plates faces to the left, and the conductive material direction of the even-numbered polypropylene plates faces to the right, and the polypropylene plates are sequentially staggered;
j. connecting the left end and the right end of the polypropylene plate by two stainless steel conduction bands respectively to form a conductive path;
k. the distance between every two polypropylene dust collecting plates is 0.5 cm;
testing the dust collection efficiency of the dust collection plate in a self-assembled electrostatic precipitation testing device. At a wind speed of 0.5m/s, for PM2.5The dust collection efficiency is as high as 91.25%.
Example 3
(1) Pretreatment
a. Taking a 16cm multiplied by 5cm polypropylene plate, and ultrasonically cleaning the polypropylene plate for 30min by using a sodium dodecyl benzene sulfonate solution with the mass fraction of 20%; then ultrasonically cleaning the mixture in acetone and water for 20min, wherein the volume ratio of the acetone to the water is 1: 1;
b. respectively weighing 4.74g of potassium permanganate solid powder and 0.55mL of 98% sulfuric acid, adding water to dilute the solid powder and the 0.55mL of 98% sulfuric acid to 100mL, and then mixing the two solutions to obtain an oxidation treatment solution;
c. immersing the treated polypropylene plate into the oxidation treatment liquid, and sealing the beaker button by using a plastic film;
d. placing the beaker in a constant-temperature magnetic stirring water bath, and treating for 7h at 60 ℃;
e. after the reaction is finished, taking out the polypropylene plate, pickling the polypropylene plate for 10min by using a saturated oxalic acid solution, washing the polypropylene plate for 10min by using deionized water, and drying the polypropylene plate in a vacuum oven at 60 ℃;
(2) synthetic conductive ink
f. Dissolving 14g of epoxy resin and 8g of polyamide resin in 10ml of ethanol and 5ml of glycerol solution, and stirring at room temperature at the rate of 100 revolutions per minute for 20 min; then 1g of sodium dodecylbenzenesulfonate was added as a dispersant. After thorough mixing, the mixture was stirred at 90 ℃ for 1 h; after the resin is fully dissolved, slowly adding 1g of carbon nano tube and 2.5g of hydroxyl carbon nano tube, and continuously stirring for 2 hours at the speed of 100 revolutions per minute;
(3) dust collecting plate preparation and assembly
g. Covering the front surface of the polypropylene plate with an adhesive tape, wherein the middle of the polypropylene plate is 11cm in length and 1.5cm in width, and the polypropylene plate is left empty and used for coating conductive ink;
h. placing the prepared polypropylene plate coated with the conductive ink in a vacuum oven at 60 ℃ for drying to obtain a polypropylene dust collecting plate with a conductive material on the surface;
i. stacking the polypropylene plates up and down, wherein the conductive material direction of the odd-numbered polypropylene plates faces to the left, and the conductive material direction of the even-numbered polypropylene plates faces to the right, and the polypropylene plates are sequentially staggered;
j. connecting the left end and the right end of the polypropylene plate by two stainless steel conduction bands respectively to form a conductive path;
k. the distance between every two polypropylene dust collecting plates is 1.5 cm;
in a self-assembled electrostatic precipitation testing deviceAnd testing the dust collection efficiency of the dust collection plate. At a wind speed of 0.5m/s, for PM2.5The dust collection efficiency is as high as 90.33%.
The dust collecting efficiency of the dust collecting plate is tested by using the self-assembled electrostatic dust collection testing device, and the result is as follows:
the self-assembled electrostatic dust removal testing device is formed by staggering 10 polypropylene plates with the size of 16cm multiplied by 5cm, the wind speed is controlled to be 0.5m/s, the concentrations of particles with different particle sizes at an inlet and an outlet are recorded in an experiment in combination with a laser haze measuring instrument, and the dust collection efficiency is calculated according to the following formula:
in the formula, CGo out: the concentration of outlet particles; cInto: the concentration of inlet particles.
The dust collecting efficiency of the dust collecting plate prepared in example 1, i.e., the conductive material region was 11cm × 1.5cm, and the interval between the plates was 0.5cm for particulate contaminants of each particle size, is shown in table 1.
TABLE 1 dust collecting efficiency test results for particles of different particle diameters at an interplate spacing of 0.5cm for an area of conductive material of 11cm × 1.5cm
| Particle size | Dust collecting efficiency (%) |
| PM1.0 | 90.88 |
| PM2.5 | 93.85 |
| PM10 | 94.45 |
The dust collecting efficiency of the dust collecting plate prepared in example 2, i.e., the conductive material region was 11cm × 5cm, and the interval between the plates was 0.5cm for each particle size of particulate contaminants, is shown in table 2.
TABLE 2 dust collecting efficiency test results for particles of different particle diameters at an interplate distance of 0.5cm when the conductive material area is 11cm × 5cm
| Particle size | Dust collecting efficiency (%) |
| PM1.0 | 87.84 |
| PM2.5 | 91.25 |
| PM10 | 93.36 |
The dust collecting efficiency of the dust collecting plate prepared in example 3, i.e., the conductive material region was 11cm × 1.5cm, and the interval between the plates was 1.5cm for particulate contaminants of each particle size, is shown in table 3.
TABLE 3 dust collecting efficiency test results for particles of different particle diameters at an interplate spacing of 1.5cm for an area of conductive material of 11cm × 1.5cm
| Particle size | Dust collection efficiency (%) |
| PM1.0 | 82.35 |
| PM2.5 | 90.33 |
| PM10 | 88.62 |
The ozone emission of the self-assembled electrostatic precipitator test device was analyzed using an ozone monitor, and the results are shown in table 4.
TABLE 4 ozone emission test results of self-assembled electrostatic precipitation test device
| Device status | Air flow (m)3/min) | Dust collecting efficiency (%) | Ozone level (ppm) |
| Opening device | 5.00 | 93.2 ± 5.0 | Is free of |
| Closing device | 5.00 | 10.2 ± 2.5 | Is free of |
The dust collection test is carried out on the prepared electrostatic conductive ink/polypropylene dust collection plate, and the result shows that the self-assembly device can be used for treating PM1.0The electrostatic dust collection efficiency can reach 90.88%, PM2.5The electrostatic dust collection efficiency can reach 93.85 percent, and the PM can be treated10The electrostatic dust collection efficiency can reach 94.45 percent, which shows that the electrostatic dust collection plate prepared by using the conductive ink as the conductive material on the surface of the polypropylene plastic plate has excellent electrostatic dust collection effect.
Claims (10)
1. A preparation method of an electrostatic conductive ink/polypropylene dust collecting plate is characterized by comprising the following steps: the method comprises the following steps:
(1) ultrasonically cleaning a polypropylene plastic plate by using a sodium dodecyl benzene sulfonate solution, and then washing by using water;
(2) carrying out surface oxidation treatment on the polypropylene plastic plate obtained in the step (1) by using a potassium permanganate/sulfuric acid solution, pickling, washing with water and drying;
(3) coating conductive ink on the polypropylene plastic plate dried in the step (2), and drying in an oven to obtain the polypropylene plastic plate with the conductive material on the surface;
(4) and (4) stacking the polypropylene plastic boards obtained in the step (3) up and down to form a gas channel, sequentially arranging the conductive materials on the parity layers in the display channel in a staggered manner according to the direction, and connecting the two ends of the conductive materials by stainless steel conduction bands to finally obtain the electrostatic type air purifier dust collecting board.
2. The method of claim 1, wherein: the ultrasonic cleaning in the step (1) comprises the following steps: and ultrasonically cleaning the glass substrate for 10-30min by using a sodium dodecyl benzene sulfonate solution with the mass fraction of 20%.
3. The method of claim 1, wherein: the water washing in the step (1) comprises the following steps: ultrasonically cleaning with acetone and water at a volume ratio of 1-1.5:1 for 10-30 min.
4. The method of claim 1, wherein: in the step (2), the potassium permanganate/sulfuric acid solution consists of 0.3mol/L potassium permanganate and 0.1mol/L sulfuric acid, and the volume ratio of the potassium permanganate to the sulfuric acid is 0.8-1.2: 1.
5. The method of claim 1, wherein: the time of the surface oxidation treatment in the step (2) is 6-8h, and the temperature is 60-80 ℃.
6. The method of claim 1, wherein: the acid washing in the step (2) comprises the following steps: pickling with saturated oxalic acid solution for 5-20 min; the water washing comprises the following steps: washing with deionized water for 5-10 min; the drying comprises the following steps: drying in a vacuum oven at 40-60 deg.C.
7. The method of claim 1, wherein: the preparation method of the conductive ink in the step (3) comprises the following steps: dissolving epoxy resin and polyamide resin in ethanol and glycerol solution, and stirring at room temperature at 100 rpm for 10-30 min; then adding sodium dodecyl benzene sulfonate as a dispersing agent; after fully mixing, stirring the mixture for 1-2h at the temperature of 80-100 ℃; after the resin is fully dissolved, the carbon nano-tubes and the hydroxyl carbon nano-tubes are slowly added, and the stirring is continued for 1 to 3 hours at the speed of 100 revolutions per minute.
8. The method of claim 7, wherein: the proportion of the epoxy resin, the polyamide resin, the ethanol, the glycerol, the sodium dodecyl benzene sulfonate, the carbon nano tube and the hydroxyl carbon nano tube is 10-15 g: 5-10 ml: 1-5 g: 1-3 g: 1-5 g.
9. The method of claim 1, wherein: the drying conditions of the oven in the step (3) are as follows: drying in a vacuum oven at 40-60 deg.C.
10. The method of claim 1, wherein: and (4) connecting the two ends by a 304 stainless steel conduction band.
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