CN112662378A - Water curtain electrode with lasting hydrophilicity and preparation method and application thereof - Google Patents
Water curtain electrode with lasting hydrophilicity and preparation method and application thereof Download PDFInfo
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Abstract
The application relates to the technical field of water curtain electrodes, and particularly discloses a durable hydrophilic water curtain electrode and a preparation method and application thereof. The water curtain electrode comprises a conductive layer, an insulating layer and a hydrophilic layer, wherein the insulating layer is coated outside the conductive layer; the hydrophilic layer is formed by coating a nano hydrophilic material outside the insulating layer, and the nano hydrophilic material comprises the following raw materials in parts by weight: 7-15 parts of hydrophilic silicon dioxide solution and 10-17 parts of hydrophilic titanium dioxide solution; the hydrophilic silicon dioxide solution contains nano silicon dioxide particles coated by polyethylene glycol with the average polymerization degree of 400-600, and the hydrophilic titanium dioxide solution contains nano titanium dioxide particles coated by polyethylene glycol with the average polymerization degree of 600-1000. The water curtain electrode of the present application can be used for an electrostatic dust removing device, which has excellent hydrophilicity and hydrophilic durability.
Description
Technical Field
The application relates to the technical field of water curtain electrodes, in particular to a water curtain electrode with lasting hydrophilicity, and a preparation method and application thereof.
Background
The water curtain electrode is one kind of electrode for electrostatic dust collecting equipment. In the electrostatic dust removal equipment, the working principle is that a high-voltage electric field is utilized to ionize smoke, and dust charges in airflow are separated from the airflow under the action of the electric field. The cathode is made of metal wires with different cross-section shapes, and is called a discharge electrode. The positive electrode is made of metal plates with different geometric shapes, and is called a dust collecting electrode.
The dust removal process comprises the following steps: the dust-containing gas is electrically separated when passing through a high-voltage electrostatic field, and dust particles are combined with negative ions to be charged negatively. The charged dust particles enter a high-voltage electric field in a direction perpendicular to the electric lines of force, and are driven to electrodes with opposite polarities according to the principle of like-polarity repulsion and opposite-polarity attraction under the action of the electric field force, and the terminal point is the electrode. After a period of dust collection, the dust collecting electrode is full of dust, and the dust collected on the electrode needs to be cleaned periodically.
In order to further reduce dust accumulation on the electrode plate, the selected electrode is a water curtain electrode. Namely, a hydrophilic layer is arranged on the outer surface of the electrode plate layer structure, and water flow is provided outside the electrode plate. When the dust moves towards the electrode plate under the action of the electric field, the dust firstly contacts with flowing water and cannot directly contact with the surface of the electrode, and the dust is washed away along with the water flow and cannot stay on the surface of the electrode. The hydrophilic layer coated on the electrode plate and the cooperation with water flow realize effective isolation between dust and the electrode plate.
However, in the conventional hydrophilic layer coated on the outer surface of the electrode, the hydrophilicity of the hydrophilic layer becomes weak after a long period of use. When water flows through the surface of the electrode plate, a continuous water film cannot be formed on the surface of the electrode plate, so that the effect of isolating and contacting dust and the electrode plate is lost.
Disclosure of Invention
In order to solve the problem that the hydrophilic durability of a hydrophilic layer is poor, the application provides a water curtain electrode with good hydrophilic durability and a preparation method and application thereof.
In a first aspect, the application provides a durable hydrophilic water curtain electrode, which adopts the following technical scheme:
a water curtain electrode with lasting hydrophily comprises a conductive layer, an insulating layer and a hydrophily layer, wherein the insulating layer is coated outside the conductive layer; the hydrophilic layer is formed by coating a nano hydrophilic material on the outside of the insulating layer, and the nano hydrophilic material comprises the following raw materials in parts by weight: 7-15 parts of hydrophilic silicon dioxide solution and 10-17 parts of hydrophilic titanium dioxide solution; the hydrophilic silicon dioxide solution contains nano silicon dioxide particles coated by polyethylene glycol with the average polymerization degree of 400-600, and the hydrophilic titanium dioxide solution contains nano titanium dioxide particles coated by polyethylene glycol with the average polymerization degree of 600-1000.
By adopting the technical scheme, the hydrophilic layer is prepared by mixing hydrophilic silicon dioxide solution and hydrophilic titanium dioxide, has good hydrophilicity and good hydrophilic durability, so that the contact angle of the prepared water curtain electrode is in the range of 1-5 degrees, and the contact angle is maintained in the range of 8-11 degrees within 12-18 months. In addition, since the hydrophilic titanium dioxide solution has excellent hydrophilicity under ultraviolet irradiation, the contact angle thereof can be as low as 1 ° at a minimum, but maintaining such excellent hydrophilicity requires ultraviolet irradiation; the contact angle of the hydrophilic silicon dioxide solution is as minimum as 3 degrees, but the hydrophilic silicon dioxide solution can show better hydrophilicity under the condition of no ultraviolet irradiation; therefore, when the two are mixed in an appropriate ratio, a water curtain electrode exhibiting excellent hydrophilicity under both ultraviolet irradiation and non-ultraviolet irradiation can be obtained.
Preferably, the nano hydrophilic material comprises the following raw materials in parts by weight: 8-11 parts of hydrophilic silicon dioxide solution and 11-13 parts of hydrophilic titanium dioxide solution.
Preferably, the nano hydrophilic material further comprises 4-10 parts by weight of peanut protein.
By adopting the technical scheme, the proper content of peanut protein is added into the raw material for preparing the nano hydrophilic material, so that the hydrophilic durability of the hydrophilic layer can be effectively prolonged, and the contact angle of the nano hydrophilic material is within the range of 3-5 degrees within 12-18 months.
Preferably, the hydrophilic silica solution is prepared by a method comprising the following steps: s1-1, mixing ortho-silicic acid, polyethylene glycol I, ethanol and water, and stirring at the temperature of 30-40 ℃ to obtain a mixed solution A, wherein the mass ratio of the ortho-silicic acid to the polyethylene glycol I is (0.7-1.2), and the average polymerization degree of the polyethylene glycol I is 400-600;
mixing water, absolute ethyl alcohol and an acidic reagent to obtain a mixed solution B with the pH value of 4.5-5.5;
s1-2, dropwise adding the mixed solution B into the mixed solution A within 0.7-1.5 h, wherein the mass ratio of the mixed solution A to the mixed solution B is (7-12): 1, and stirring uniformly after the dropwise adding is finished.
Preferably, the hydrophilic titanium dioxide solution is prepared by a method comprising the following steps: s2-1, mixing tetrabutyl titanate, polyethylene glycol II, ethanol and diethanol amine, and stirring to obtain a mixed solution C, wherein the mass ratio of tetrabutyl titanate to polyethylene glycol II is 10 (13-24), and the average polymerization degree of polyethylene glycol II is 600-1000; mixing water and ethanol to obtain a solution D;
s2-2, dropwise adding the solution D into the mixed solution C within 0.7-1.5 h, wherein the mass ratio of the solution C to the solution D is 2 (0.8-1.4); stirring evenly after the dripping is finished.
Preferably, the insulating layer is formed by coating an insulating material on the conductive layer, wherein the insulating material is selected from one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS, polycarbonate, polyamide, organic glass and polyester resin.
Preferably, the conductive layer is made of a conductive material, and the conductive material is a metal material, a carbon material, or a semiconductor material.
Preferably, the metal material is a metal, a metal alloy or a metal composite material; the metal is selected from any one of copper, aluminum, iron, zinc, nickel, tin and lead; the metal alloy is selected from any one of copper alloy, aluminum alloy and stainless steel; the metal composite material is formed by coating or plating other metal materials on the surface of metal.
In a second aspect, the application provides a method for preparing a durable hydrophilic water curtain electrode, which adopts the following technical scheme:
a preparation method of a durable hydrophilic water curtain electrode comprises the following steps:
coating an insulating material outside the conductive layer to form an insulating layer, and coating a nano hydrophilic material outside the insulating layer to form a hydrophilic layer, wherein the preparation method of the nano hydrophilic material comprises the following steps:
mixing a hydrophilic silicon dioxide solution and a hydrophilic titanium dioxide solution, wherein the hydrophilic silicon dioxide solution contains nano silicon dioxide particles coated by polyethylene glycol with the average polymerization degree of 400-600, and the hydrophilic titanium dioxide solution contains nano titanium dioxide particles coated by polyethylene glycol with the average polymerization degree of 600-1000.
Preferably, the nano hydrophilic material further comprises 4-10 parts by weight of peanut protein;
after the hydrophilic silica solution and the hydrophilic titania solution are mixed, the preparation method further includes: adding the peanut protein, stirring uniformly, and irradiating for 14-21min by ultraviolet.
Preferably, the preparation method of the hydrophilic silica solution comprises the following steps: s1-1, mixing ortho-silicic acid, polyethylene glycol I, ethanol and water, and stirring at the temperature of 30-40 ℃ to obtain a mixed solution A, wherein the mass ratio of the ortho-silicic acid to the polyethylene glycol I is (0.7-1.2), and the average polymerization degree of the polyethylene glycol I is 400-600;
mixing water, absolute ethyl alcohol and an acidic reagent to obtain a mixed solution B with the pH value of 4.5-5.5;
s1-2, dropwise adding the mixed solution B into the mixed solution A within 0.7-1.5 h, wherein the mass ratio of the mixed solution A to the mixed solution B is (7-12): 1, and stirring uniformly after the dropwise adding is finished.
By adopting the technical scheme, the nano silicon dioxide with the particle size within the range of 5-30 nm is prepared. When the nano silicon dioxide particles are prepared, the silicon dioxide particles are coated and modified by polyethylene glycol I, so that the particle size of the prepared nano silicon dioxide particles is controllable (the particle size is controlled to be 5-30 nm), the particle size of the obtained nano silicon dioxide is smaller, a hydrophilic silicon dioxide solution with a smaller contact angle is obtained, and the hydrophilic silicon dioxide solution has excellent hydrophilic performance. In addition, the average polymerization degree of the added polyethylene glycol I is controlled within the range of 400-600, the nano silicon dioxide coated by the polyethylene glycol is small in particle size, so that the nano hydrophilic material shows excellent hydrophilicity, and the hydrophilicity of the hydrophilic silicon dioxide solution can be obviously improved in the modification and coating process of the polyethylene glycol. When the average polymerization degree of the added polyethylene glycol i is too small or too large, the contact angle of the hydrophilic silica solution is rather increased, that is, the hydrophilicity of the hydrophilic silica solution is not good. In addition, when the hydrophilic silicon dioxide solution is prepared, the pH value of the solution B needs to be controlled within the range of 4.5-5.5: when the pH value is too low (such as less than 3), the solution A and the solution B are mixed and react too fast, so that the particle size of the prepared nano silicon dioxide is uncontrollable, and the hydrophilicity of the obtained hydrophilic silicon dioxide solution is influenced; when the pH value is too high (such as 6-7), the reaction is too slow after the solution A and the solution B are mixed, and the reaction efficiency is too low, so that the preparation time is too long when the hydrophilic silicon dioxide solution is prepared.
Preferably, the preparation method of the hydrophilic titanium dioxide solution comprises the following steps: s2-1, mixing tetrabutyl titanate, polyethylene glycol II, ethanol and diethanol amine, and stirring to obtain a mixed solution C, wherein the mass ratio of tetrabutyl titanate to polyethylene glycol II is 10 (13-24), and the average polymerization degree of polyethylene glycol II is 600-1000; mixing water and ethanol to obtain a solution D;
s2-2, dropwise adding the solution D into the mixed solution C within 0.7-1.5 h, wherein the mass ratio of the solution C to the solution D is 2 (0.8-1.4); stirring evenly after the dripping is finished.
By adopting the technical scheme, the nano titanium dioxide with the particle size within the range of 5-30 nm is prepared. When preparing the nano titanium dioxide particles, firstly coating and modifying titanium dioxide by polyethylene glycol II to ensure that the particle size of the prepared nano titanium dioxide particles is controllable (the particle size is controlled to be 5-30 nm); when the particle size of the obtained nano titania is controlled within a small range, the photocatalytic activity of the nano titania is better, the contact angle of the hydrophilic titania solution under ultraviolet irradiation is made smaller, and the hydrophilic titania solution exhibits excellent hydrophilicity (the contact angle is as low as 1 °), and hydrophilic stability. In addition, the average polymerization degree of the added polyethylene glycol II is selected to be 600-1000, and the hydrophilicity of the hydrophilic titanium dioxide solution of the nano titanium dioxide coated by the polyethylene glycol modified polyethylene glycol II is obviously improved. When the average polymerization degree of the added polyethylene glycol II is too small (e.g., 400 to 600) or too large, the contact angle of the hydrophilic titanium dioxide solution is rather increased, i.e., the hydrophilicity is not good.
In a third aspect, the application provides an application of a durable hydrophilic water curtain electrode, which adopts the following technical scheme:
the application of the water curtain electrode which is permanently hydrophilic is characterized in that the water curtain electrode is used for electrostatic dust collection equipment, and an ultraviolet irradiation system is further arranged in the electrostatic dust collection equipment.
By adopting the technical scheme, when the durable hydrophilic water curtain electrode is used for the electrostatic dust removal equipment, the practical service life of the electrostatic dust removal equipment is longer.
In summary, the present application has the following beneficial effects:
1. the nano hydrophilic material is prepared by mixing a hydrophilic titanium dioxide solution and a hydrophilic silicon dioxide solution, so that the nano hydrophilic material with better hydrophilicity and hydrophilic durability is obtained. When the nano hydrophilic material is used for preparing a water curtain electrode, the contact angle of the water curtain electrode is in the range of 1-5 degrees, and the contact angle of the water curtain electrode is maintained in the range of 8-11 degrees within 12-18 months.
2. The nano hydrophilic material is further optimized by adding the peanut protein, so that the prepared water curtain electrode has excellent hydrophilic durability. The contact angle of the water curtain electrode is increased to 2 degrees; after 18 months, the contact angle attenuation is 3 degrees, and the hydrophilic durability is obviously improved.
3. According to the preparation method, polyethylene glycol modified coated silicon dioxide particles with the average polymerization degree of 400-600 are selected, polyethylene glycol modified coated titanium dioxide particles with the average polymerization degree of 600-1000 are selected, and when the prepared nano hydrophilic material is used for a hydrophilic layer of a water curtain electrode, the hydrophilic durability of the water curtain electrode is remarkably improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials in the present application are all commonly available on the market unless otherwise specified. The polyvinyl chloride coating is purchased from Hubei Yao Gangquan chemical industry Co., Ltd, the polypropylene anticorrosive coating and the polystyrene anticorrosive coating are purchased from Changzhou Kuncai chemical industry Co., Ltd, and the polyester resin is DSM Dismann saturated polyester resin Uralac SN 889.
Preparation example of hydrophilic silica solution
In preparation examples 1 to 5 of the hydrophilic silica solution, the preparation method comprises the steps of:
s1-1, mixing ortho-silicic acid, polyethylene glycol I, absolute ethyl alcohol and water, and stirring at the temperature of 30-40 ℃ for 15-25 min to obtain a mixed solution A;
mixing water, absolute ethyl alcohol and hydrochloric acid to obtain a mixed solution B;
wherein, when preparing the mixed solution A, the mass ratio of the ortho-silicic acid, the polyethylene glycol I, the absolute ethyl alcohol and the water can be 5 (0.7-1.2) to 15-18 to 1.3-2.5. Polyethylene glycol I can be obtained by mixing polyethylene glycol 400 and polyethylene glycol 600; the mass ratio of polyethylene glycol 400 to polyethylene glycol 600 is different, and the average polymerization degrees of the obtained polyethylene glycol I are different; the mass ratio of the polyethylene glycol 400 to the polyethylene glycol 600 can be 1 (0.4-4).
When the mixed solution B is prepared, the mass ratio of water to absolute ethyl alcohol can be 1 (8-10). And simultaneously adding hydrochloric acid to ensure that the pH value of the mixed solution B is within the range of 4.5-5.5.
S1-2, dropwise adding the mixed liquid B with a certain mass into the mixed liquid A within 0.5-1.5 h, and stirring for 1.5-3 h after dropwise adding, wherein the mass ratio of the mixed liquid A to the mixed liquid B is (7-12): 1.
Preparation of hydrophilic silica solution example 1
The hydrophilic silica solution is prepared by the following steps:
s1-1, mixing 50g of silicic acid, 10g of polyethylene glycol I (5g of polyethylene glycol 400 and 5g of polyethylene glycol 600), 740g of absolute ethyl alcohol and 100g of water, and stirring at 35 ℃ for 20min to obtain a mixed solution A; mixing 10g of pure water, 90g of absolute ethyl alcohol and 0.2g of hydrochloric acid to obtain a mixed solution B;
s1-2, dropwise adding the obtained mixed liquid B into the mixed liquid A in 1h, and stirring for 1h after dropwise adding.
Preparation example 2 of hydrophilic silica solution
The hydrophilic silica solution preparation example and the hydrophilic silica solution preparation example 1 are different in that the mass ratio of the ortho-silicic acid to the polyethylene glycol I is 5: 0.7; the method specifically comprises the following steps: 50g of orthosilicic acid, 3.5g of polyethylene glycol 400 and 3.5g of polyethylene glycol 600 are mixed. Otherwise as in hydrophilic silica solution preparation example 1.
Preparation of hydrophilic silica solution example 3
The hydrophilic silica solution preparation example and the hydrophilic silica solution preparation example 1 are different in that the mass ratio of the ortho-silicic acid to the polyethylene glycol I is 5: 1.2; the method specifically comprises the following steps: 50g of orthosilicic acid are mixed with 6g of polyethylene glycol 400 and 6g of polyethylene glycol 600. Otherwise as in hydrophilic silica solution preparation example 1.
Preparation example 4 of hydrophilic silica solution
The hydrophilic silica solution preparation example and the hydrophilic silica solution preparation example 1 are different in that the mass ratio of polyethylene glycol 400 and polyethylene glycol 600 for preparing polyethylene glycol I is 1: 0.4; the method specifically comprises the following steps: 50g of orthosilicic acid, 7.15g of polyethylene glycol 400 and 2.85g of polyethylene glycol 600 are mixed. Otherwise as in hydrophilic silica solution preparation example 1.
Preparation of hydrophilic silica solution example 5
The hydrophilic silica solution preparation example and the hydrophilic silica solution preparation example 1 are different in that the mass ratio of polyethylene glycol 400 and polyethylene glycol 600 for preparing polyethylene glycol I is 1: 4; the method specifically comprises the following steps: 50g of orthosilicic acid are mixed with 2g of polyethylene glycol 400 and 8g of polyethylene glycol 600. Otherwise as in hydrophilic silica solution preparation example 1.
Preparation of hydrophilic silica solution example 6
The hydrophilic silica solution preparation example and the hydrophilic silica solution preparation example 1 are different in that the selected polyethylene glycol I is a mixture of polyethylene glycol 600 and polyethylene glycol 1000, and the mass ratio of the polyethylene glycol to the polyethylene glycol is 1: 1; the method specifically comprises the following steps: 50g of orthosilicic acid are mixed with 5g of polyethylene glycol 600 and 5g of polyethylene glycol 1000. Otherwise as in hydrophilic silica solution preparation example 1.
Preparation of hydrophilic silica solution example 7
The hydrophilic silica solution preparation example and the hydrophilic silica solution preparation example 1 are different in that the raw material of the mixed solution a does not contain polyethylene glycol i; the method specifically comprises the following steps: 50g of orthosilicic acid, 740g of absolute ethyl alcohol and 100g of water are mixed, and stirred for 20min at the temperature of 35 ℃ to obtain a mixed solution A. Otherwise as in hydrophilic silica solution preparation example 1.
Preparation example of hydrophilic titanium dioxide solution
In the hydrophilic titania solution production examples 1 to 5, the production methods included the following steps:
s2-1, mixing tetrabutyl titanate, polyethylene glycol II, absolute ethyl alcohol and diethanol amine, and stirring to obtain a mixed solution C, wherein the mass ratio of tetrabutyl titanate, polyethylene glycol II, absolute ethyl alcohol to diethanol amine is 10 (1.3-2.4) to (48-62) to (0.7-1.2). Polyethylene glycol II can be obtained by mixing polyethylene glycol 600 and polyethylene glycol 1000; the mass ratio of polyethylene glycol 600 to polyethylene glycol 1000 is different, and the average polymerization degrees of the obtained polyethylene glycol II are different; the mass ratio of the polyethylene glycol 600 to the polyethylene glycol 1000 can be 1 (0.3-4.5).
When the mixed solution D is prepared, the mass ratio of water to absolute ethyl alcohol can be 1 (16-26).
S2-2, dropwise adding the mixed liquid D with a certain mass into the mixed liquid C within 0.5-1.5 h, and stirring for 1.5-3 h after the dropwise adding is finished, wherein the mass ratio of the mixed liquid C to the mixed liquid D is (1.8-2.5): 1.
Preparation of hydrophilic Titania solution example 1
The hydrophilic titanium dioxide solution is prepared by the following steps:
s2-1, mixing 100g of tetrabutyl titanate, 20g of polyethylene glycol II (8g of polyethylene glycol 600, 12g of polyethylene glycol 1000), 560g of anhydrous ethanol and 5g of diethanolamine, and stirring to obtain a mixed solution C;
mixing 15g of pure water and 300g of absolute ethyl alcohol to obtain a mixed solution D;
s2-2, dropwise adding the mixed solution D into the mixed solution C, and finishing dropwise adding within 1 h; after the end of the dropwise addition, stirring was carried out for 2 h.
Preparation example 2 of hydrophilic Titania solution
The hydrophilic titanium dioxide solution preparation example and the hydrophilic titanium dioxide solution preparation example 1 are different in mass ratio of tetrabutyl titanate to polyethylene glycol II, wherein the mass ratio of tetrabutyl titanate to polyethylene glycol II is 10: 1.3; the method specifically comprises the following steps: 100g of tetrabutyl titanate, 5.2g of polyethylene glycol 600 and 7.8g of polyethylene glycol 1000 are mixed. The other steps were carried out in the same manner as in preparation example 1 of the hydrophilic titanium dioxide solution.
Preparation of hydrophilic Titania solution example 3
The hydrophilic titanium dioxide solution preparation example and the hydrophilic titanium dioxide solution preparation example 1 are different in mass ratio of tetrabutyl titanate to polyethylene glycol II, wherein the mass ratio of tetrabutyl titanate to polyethylene glycol II is 10: 2.4; the method specifically comprises the following steps: 100g of tetrabutyl titanate, 9.6g of polyethylene glycol 600 and 14.4g of polyethylene glycol 1000 are mixed. The other steps were carried out in the same manner as in preparation example 1 of the hydrophilic titanium dioxide solution.
Preparation example 4 of hydrophilic Titania solution
The hydrophilic titanium dioxide solution preparation example and the hydrophilic titanium dioxide solution preparation example 1 are different in the mass ratio of polyethylene glycol 600 to polyethylene glycol 1000 for preparing polyethylene glycol II, wherein the mass ratio of the polyethylene glycol 600 to the polyethylene glycol 1000 is 1: 0.3; the method specifically comprises the following steps: 100g of tetrabutyl titanate, 15.4g of polyethylene glycol 600 and 4.6g of polyethylene glycol 1000 are mixed. The other steps were carried out in the same manner as in preparation example 1 of the hydrophilic titanium dioxide solution.
Preparation of hydrophilic Titania solution example 5
The hydrophilic titanium dioxide solution preparation example and the hydrophilic titanium dioxide solution preparation example 1 are different in the mass ratio of polyethylene glycol 600 to polyethylene glycol 1000 for preparing polyethylene glycol II, wherein the mass ratio of the polyethylene glycol 600 to the polyethylene glycol 1000 is 1: 4.5; the method specifically comprises the following steps: 100g of tetrabutyl titanate, 3.6g of polyethylene glycol 600 and 16.4g of polyethylene glycol 1000 are mixed. The other steps were carried out in the same manner as in preparation example 1 of the hydrophilic titanium dioxide solution.
Preparation of hydrophilic Titania solution example 6
The difference between the preparation example of the hydrophilic titanium dioxide solution and the preparation example 1 of the hydrophilic titanium dioxide solution is that the selected polyethylene glycol II is a mixture of polyethylene glycol 400 and polyethylene glycol 600, and the mass ratio of the two is 1: 1.5; the method specifically comprises the following steps: 100g of tetrabutyl titanate, 8g of polyethylene glycol 400 and 12g of polyethylene glycol 600 are mixed. The other steps were carried out in the same manner as in preparation example 1 of the hydrophilic titanium dioxide solution.
Preparation of hydrophilic Titania solution example 7
The hydrophilic titanium dioxide solution preparation example and the hydrophilic titanium dioxide solution preparation example 1 are different in that the raw material for preparing the mixed solution C does not contain polyethylene glycol ii; the method specifically comprises the following steps: 100g of tetrabutyl titanate, 560g of absolute ethyl alcohol and 5g of diethanolamine are mixed and stirred to obtain a mixed solution C. The other steps were carried out in the same manner as in preparation example 1 of the hydrophilic titanium dioxide solution.
Examples
Example 1
And mixing 330g of hydrophilic silica solution and 360g of hydrophilic titanium dioxide solution to obtain the nano hydrophilic material for later use. Among them, a hydrophilic silica solution was prepared from hydrophilic silica solution preparation example 1, and a hydrophilic titania solution was prepared from hydrophilic titania solution preparation example 1.
And the conducting layer is made of an aluminum alloy material, a polyvinyl chloride coating is sprayed outside the conducting layer to form an insulating layer, and a nano hydrophilic material is sprayed outside the insulating layer to form a hydrophilic layer, so that the water curtain electrode is prepared.
Example 2
This example differs from example 1 in the amount of hydrophilic silica solution and hydrophilic titania solution used, as shown in Table 1.
And the conductive layer is made of stainless steel, a polypropylene anticorrosive coating is sprayed outside the conductive layer to form an insulating layer, and a nano hydrophilic material is sprayed outside the insulating layer to form a hydrophilic layer, so that the water curtain electrode is prepared.
Otherwise, the same procedure as in example 1 was repeated.
Example 3
This example differs from example 1 in the amount of hydrophilic silica solution and hydrophilic titania solution used, as shown in Table 1.
And the conducting layer is made of an aluminum alloy material, a polystyrene anticorrosive coating is sprayed outside the conducting layer to form an insulating layer, and a nano hydrophilic material is sprayed outside the insulating layer to form a hydrophilic layer, so that the water curtain electrode is prepared.
Otherwise, the same procedure as in example 1 was repeated.
Example 4
This example differs from example 1 in the amount of hydrophilic silica solution and hydrophilic titania solution used, as shown in Table 1.
And the conducting layer is made of copper, polyester resin is sprayed outside the conducting layer to form an insulating layer, and nano-hydrophilic materials are sprayed outside the insulating layer to form a hydrophilic layer, so that the water curtain electrode is prepared.
Otherwise, the same procedure as in example 1 was repeated.
Example 5
This example differs from example 1 in the amount of hydrophilic silica solution and hydrophilic titania solution used, as shown in Table 1.
The conductive layer is made of semiconductor material, and is specifically selected to be zinc sulfide. And spraying polyester resin outside the conductive layer to form an insulating layer, and spraying a nano hydrophilic material outside the insulating layer to form a hydrophilic layer, thus preparing the water curtain electrode.
Otherwise, the same procedure as in example 1 was repeated.
Examples 6 to 10
Examples 6 to 10 are different from example 1 in the amount and/or kind of raw materials for preparing the nano hydrophilic material, and are specifically shown in table 1. Otherwise, the same procedure as in example 1 was repeated.
TABLE 1 amounts and kinds of raw materials for preparing nano hydrophilic materials in examples 1-10
| Examples | Hydrophilic silica solution/g | Hydrophilic titanium dioxide solution/g | Peanut protein/g |
| Example 1 | 210 | 300 | - |
| Example 2 | 300 | 360 | - |
| Example 3 | 450 | 510 | - |
| Example 4 | 240 | 360 | - |
| Example 5 | 330 | 360 | - |
| Example 6 | 300 | 330 | - |
| Example 7 | 300 | 390 | - |
| Example 8 | 300 | 360 | 120 |
| Example 9 | 300 | 360 | 165 |
| Example 10 | 300 | 360 | 300 |
In examples 8 to 10, the method for preparing the nano hydrophilic material includes: mixing the hydrophilic silicon dioxide solution and the hydrophilic titanium dioxide solution, adding the peanut protein, uniformly stirring, and irradiating for 18min by ultraviolet.
Examples 11 to 18
Examples 11 to 18 differ from example 9 in that the hydrophilic silica solution and/or the hydrophilic titania solution used to prepare the nano hydrophilic material were prepared by different methods, as shown in table 2.
Table 2 selection of hydrophilic silica solution and hydrophilic titania solution for preparing nano hydrophilic material
Comparative example
Comparative example 1
This comparative example is different from example 9 in that a hydrophilic silica solution for preparing a nano hydrophilic material was prepared by the method of hydrophilic silica solution preparation example 6, and the other is the same as example 9.
Comparative example 2
The comparative example is different from example 9 in that a hydrophilic titania solution for preparing a nano-sized hydrophilic material was prepared by the method of hydrophilic titania solution preparation example 6, and the other is the same as example 9.
Comparative example 3
This comparative example is different from example 9 in that a hydrophilic silica solution for preparing a nano hydrophilic material was prepared by the method of hydrophilic silica solution preparation example 7, and a hydrophilic titania solution for preparing a nano hydrophilic material was prepared by the method of hydrophilic titania solution preparation example 7, and the other is the same as example 9.
Comparative example 4
The comparative example and example 9 are different in that a hydrophilic layer is formed by spraying a commercially available hydrophilic resin selected from bisphenol a type epoxy resin E44 on the insulating layer instead of the nano hydrophilic material, and the other example is the same as example 9.
Performance test
The performance of the water curtain electrodes prepared in examples 1 to 16 and comparative examples 1 to 5 was measured.
Contact angle test:
the prepared water curtain electrode is tested by a contact angle instrument, and the specific result is shown in table 3; and testing the contact angle of each water curtain electrode after 1 year, and before detecting the contact angle of the water curtain electrode, carrying out ultraviolet irradiation on the water curtain electrode for 10min, wherein the specific results are shown in table 3.
TABLE 3 Properties of Water curtain electrodes obtained in examples 1 to 16 and comparative examples 1 to 4
Note: in the water curtain electrode in comparative example 6, the contact angle of the water curtain electrode had changed to 10 ° after 1 month, "-" in the table indicates the time node, and the contact angle of the water curtain electrode was not measured.
From the data results in Table 3, the water curtain electrodes prepared by comparing the results of examples 1-7 with those of examples 8-12 were more hydrophilic for long-term performance after addition of peanut protein. After peanut protein is added, the contact angle of the obtained water curtain electrode is kept in the range of 3-5 degrees within 18 months, namely the water curtain electrode has good hydrophilic durability. The water curtain electrodes (examples 1-7) without added peanut protein had better hydrophilicity, which was maintained in the range of 5 ° to 7 ° for 12 months, but after continued use, the contact angle of the water curtain electrodes was attenuated to 8 ° to 11 °, and the hydrophilicity was significantly reduced.
The addition amount of the peanut protein has certain influence on the hydrophilicity of the nano hydrophilic material: the data results of examples 8 to 10 show that the hydrophilicity and the hydrophilic durability of the water curtain electrode can be effectively improved when the added amount of peanut protein is in the range of 4 to 10 parts by weight (i.e., 120 to 300g) as compared to the embodiment of example 2. The contact angle of the water curtain electrode is increased from 4 degrees to 2 degrees, and the hydrophilicity is effectively improved; after 18 months, the contact angle increases from 10 ° to 3 °, and the hydrophilic durability increases significantly. In example 9, the contact angle of the water curtain electrode prepared was as low as 2 °, the contact angle was merely decayed from 2 ° to 3 ° over a period of up to 18 months, and the hydrophilicity of the water curtain electrode was hardly affected.
In the process of preparing the hydrophilic silicon dioxide solution and the hydrophilic titanium dioxide solution, the average polymerization degree of the polyethylene glycol has influence on the hydrophilicity and the hydrophilic durability of the finally prepared water curtain electrode. As can be seen from the comparison of the data of example 9 and example 13, when the average polymerization degree of the selected polyethylene glycol i in the hydrophilic silicon dioxide solution for preparing the water curtain electrode is close to 400 (i.e., in example 13, the polyethylene glycol i is prepared from polyethylene glycol 400 and polyethylene glycol 600 in a mass ratio of 1: 0.4), the contact angle of the prepared water curtain electrode is increased from 4 ° to 9 ° after 18 months of use, and the hydrophilic property is remarkably attenuated. When the average polymerization degree of the polyethylene glycol I selected from the hydrophilic silicon dioxide solution for preparing the water curtain electrode is close to 600 (namely, in example 14, the polyethylene glycol I is prepared from polyethylene glycol 400 and polyethylene glycol 600 in a mass ratio of 1: 4), the contact angle of the prepared water curtain electrode is increased from 4 degrees to 10 degrees after the prepared water curtain electrode is used for 18 months, and the hydrophilic attenuation is obvious. In addition, as can be seen from comparison of the data results of example 9 and comparative example 1, when the average polymerization degree of the selected polyethylene glycol i is excessively large (more than 600) at the time of preparing the hydrophilic silica solution, the hydrophilic durability of the resulting water curtain electrode is significantly reduced (the contact angle at 18 months is as high as 13 °). Therefore, it is appropriate in the present application to control the average polymerization degree of polyethylene glycol i for preparing the hydrophilic silica solution within the range of 400 to 600, so that the contact angle of the water curtain electrode is maintained within the range of less than 10 ° for 18 months, thereby ensuring that the water curtain formed on the water curtain electrode has good continuity.
As can be seen from the comparison of the data of example 9 and example 15, when the average polymerization degree of the selected polyethylene glycol ii in the hydrophilic titanium dioxide solution for preparing the water curtain electrode is close to 600 (i.e., in example 15, the polyethylene glycol ii is prepared from polyethylene glycol 600 and polyethylene glycol 1000 in a mass ratio of 1: 0.3), the contact angle of the prepared water curtain electrode is increased from 4 ° to 10 ° after 18 months of use, and the hydrophilic property is remarkably attenuated. When the average polymerization degree of polyethylene glycol I selected from the hydrophilic silicon dioxide solution for preparing the water curtain electrode is close to 1000 (namely, in example 16, polyethylene glycol II is prepared from polyethylene glycol 600 and polyethylene glycol 1000 in a mass ratio of 1: 4.5), the contact angle of the prepared water curtain electrode is increased from 4 degrees to 9 degrees after the prepared water curtain electrode is used for 18 months, and the hydrophilic attenuation is obvious. In addition, as can be seen from comparison of the data results of example 9 and comparative example 2, when the average polymerization degree of polyethylene glycol ii selected is too small (less than 600) at the time of preparing the hydrophilic titania solution, the hydrophilic durability of the resulting water curtain electrode is significantly reduced (the contact angle at 18 months is as high as 13 °). Therefore, the average polymerization degree of the polyethylene glycol II for preparing the hydrophilic silicon dioxide solution is controlled within the range of 600-1000 in the application, so that the contact angle of the water curtain electrode is kept within the range of less than 10 degrees within 18 months, and the water curtain formed on the water curtain electrode has better continuity.
As seen from the data results of comparative example 3, when the nano hydrophilic material was used to manufacture the water curtain electrode when polyethylene glycol was not added to both the hydrophilic silica solution and the hydrophilic titania solution for manufacturing the nano hydrophilic material, the hydrophilicity of the water curtain electrode was significantly attenuated after 18 months.
In comparative example 4, when a water curtain electrode was prepared using a conventional commercially available hydrophilic resin, the water curtain electrode had poor hydrophilicity (contact angle of 7 °), and in addition, the water curtain electrode maintained good hydrophilicity only for one month (contact angle of up to 10 °), and the contact angle was decreased to 15 ° after 6 months and to 25 ° after one year.
In conclusion, the water curtain electrode prepared by the method has better hydrophilicity and hydrophilic durability. The water curtain electrode can be used for electrostatic dust removal equipment and serves as a conductive electrode of the electrostatic dust removal equipment, and the service life of the water curtain electrode is longer. When the water curtain electrode is used, ultraviolet irradiation needs to be carried out on the water curtain electrode every 3-8 months.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A water curtain electrode with lasting hydrophily is characterized by comprising a conductive layer, an insulating layer and a hydrophily layer, wherein the insulating layer is coated outside the conductive layer; the hydrophilic layer is formed by coating a nano hydrophilic material on the outside of the insulating layer, and the nano hydrophilic material comprises the following raw materials in parts by weight: 7-15 parts of hydrophilic silicon dioxide solution and 10-17 parts of hydrophilic titanium dioxide solution; the hydrophilic silicon dioxide solution contains nano silicon dioxide particles coated by polyethylene glycol with the average polymerization degree of 400-600, and the hydrophilic titanium dioxide solution contains nano titanium dioxide particles coated by polyethylene glycol with the average polymerization degree of 600-1000.
2. A permanently hydrophilic water curtain electrode as defined in claim 1, wherein: the nano hydrophilic material comprises the following raw materials in parts by weight: 8-11 parts of hydrophilic silicon dioxide solution and 11-13 parts of hydrophilic titanium dioxide solution.
3. A permanently hydrophilic water curtain electrode as claimed in any one of claims 1-2, wherein: the nano hydrophilic material also comprises 4-10 parts by weight of peanut protein.
4. A method of making a permanently hydrophilic water curtain electrode as defined in any one of claims 1-2, comprising the steps of:
coating an insulating material outside the conductive layer to form an insulating layer, and coating a nano hydrophilic material outside the insulating layer to form a hydrophilic layer, wherein the preparation method of the nano hydrophilic material comprises the following steps:
mixing a hydrophilic silicon dioxide solution and a hydrophilic titanium dioxide solution, wherein the hydrophilic silicon dioxide solution contains nano silicon dioxide particles coated by polyethylene glycol with the average polymerization degree of 400-600, and the hydrophilic titanium dioxide solution contains nano titanium dioxide particles coated by polyethylene glycol with the average polymerization degree of 600-1000.
5. The method for preparing a durable hydrophilic water curtain electrode as claimed in claim 4, wherein the nano hydrophilic material further comprises 4-10 parts by weight of peanut protein;
after the hydrophilic silica solution and the hydrophilic titania solution are mixed, the preparation method further includes: adding the peanut protein, stirring uniformly, and irradiating for 14-21min by ultraviolet.
6. The method of any one of claims 4-5 for making a permanently hydrophilic water curtain electrode, wherein: the preparation method of the hydrophilic silicon dioxide solution comprises the following steps:
s1-1, mixing ortho-silicic acid, polyethylene glycol I, ethanol and water, and stirring at the temperature of 30-40 ℃ to obtain a mixed solution A, wherein the mass ratio of the ortho-silicic acid to the polyethylene glycol I is (0.7-1.2), and the average polymerization degree of the polyethylene glycol I is 400-600;
mixing water, absolute ethyl alcohol and an acidic reagent to obtain a mixed solution B with the pH = 4.5-5.5;
s1-2, dropwise adding the mixed solution B into the mixed solution A within 0.7-1.5 h, wherein the mass ratio of the mixed solution A to the mixed solution B is (7-12): 1, and stirring uniformly after the dropwise adding is finished.
7. The method of any one of claims 4-5 for making a permanently hydrophilic water curtain electrode, wherein: the preparation method of the hydrophilic titanium dioxide solution comprises the following steps:
s2-1, mixing tetrabutyl titanate, polyethylene glycol II, ethanol and diethanol amine, and stirring to obtain a mixed solution C, wherein the mass ratio of tetrabutyl titanate to polyethylene glycol II is 10 (13-24), and the average polymerization degree of polyethylene glycol II is 600-1000; mixing water and ethanol to obtain a solution D;
s2-2, dropwise adding the solution D into the mixed solution C within 0.7-1.5 h, wherein the mass ratio of the solution C to the solution D is 2 (0.8-1.4); stirring evenly after the dripping is finished.
8. Use of a permanently hydrophilic water curtain electrode according to any one of claims 1 to 3, wherein the water curtain electrode is used in an electrostatic precipitation device, which further comprises an ultraviolet radiation system.
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| US20100228341A1 (en) * | 2009-03-04 | 2010-09-09 | Boston Scientific Scimed, Inc. | Endoprostheses |
| CN102432196A (en) * | 2011-09-22 | 2012-05-02 | 中国航天科技集团公司第五研究院第五一O研究所 | Preparation method of superhydrophilic TiO2/SiO2 porous bilaminar membrane |
| CN105689143A (en) * | 2016-03-29 | 2016-06-22 | 北京生泰宝科技有限公司 | Water curtain electrode used for electric dust precipitation |
| CN106914154A (en) * | 2017-02-27 | 2017-07-04 | 武汉科技大学 | PEG‑TiO2The preparation method of the hydrophilic milipore filters of/PES/PVA and application |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100228341A1 (en) * | 2009-03-04 | 2010-09-09 | Boston Scientific Scimed, Inc. | Endoprostheses |
| CN102432196A (en) * | 2011-09-22 | 2012-05-02 | 中国航天科技集团公司第五研究院第五一O研究所 | Preparation method of superhydrophilic TiO2/SiO2 porous bilaminar membrane |
| CN105689143A (en) * | 2016-03-29 | 2016-06-22 | 北京生泰宝科技有限公司 | Water curtain electrode used for electric dust precipitation |
| CN106914154A (en) * | 2017-02-27 | 2017-07-04 | 武汉科技大学 | PEG‑TiO2The preparation method of the hydrophilic milipore filters of/PES/PVA and application |
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