CN115678401B - Water-based strippable nano composite polyurethane coating and preparation method thereof - Google Patents
Water-based strippable nano composite polyurethane coating and preparation method thereof Download PDFInfo
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- CN115678401B CN115678401B CN202211319723.9A CN202211319723A CN115678401B CN 115678401 B CN115678401 B CN 115678401B CN 202211319723 A CN202211319723 A CN 202211319723A CN 115678401 B CN115678401 B CN 115678401B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Abstract
The invention discloses a water-based strippable nano-composite polyurethane coating and a preparation method thereof, wherein the water-based strippable nano-composite polyurethane coating comprises the following components in parts by weight: the preparation method comprises the steps of adding 20-80 parts of water, 750-900 parts of aqueous polyurethane emulsion and 30-170 parts of magnetic adsorbent into the water, mixing and stirring the aqueous polyurethane emulsion and the magnetic adsorbent, and dispersing the aqueous polyurethane emulsion and the magnetic adsorbent to obtain the aqueous strippable nano-composite polyurethane coating.
Description
Technical Field
The invention relates to the field of coatings, in particular to a water-based strippable nano composite polyurethane coating and a preparation method thereof.
Background
In the nuclear power production process, dangerous radioactive substances are released to the natural environment, radioactive substances remain on the surface of equipment after nuclear facilities are retired, and surface decontamination is an important technology for nuclear accidents, environmental restoration after nuclear facilities are retired and equipment decontamination. Conventional high pressure water physical removal methods are prone to contaminant diffusion. The method of stripping the coating can effectively prevent a large amount of radioactive contamination liquid and particle transmission contamination.
Disclosure of Invention
The invention provides a water-based strippable nano-composite polyurethane coating and a preparation method thereof.
In order to achieve the first object of the present invention, the following technical scheme is adopted:
the water-based strippable nano-composite polyurethane coating comprises the following components in parts by weight:
20-80 parts of water;
750-900 parts of aqueous polyurethane emulsion;
30-170 parts of magnetic adsorbent.
In the invention, the unit mass of the parts by weight is as follows: parts refer to grams (g).
In the present invention, the pH of the aqueous solution having a pH of 1 to 6 is adjusted by dropping HCl having a concentration of 0.01 to 0.5M into water.
As a preferable scheme of the water-based strippable nano composite polyurethane coating, the glass transition temperature of the water-based polyurethane emulsion is-60 to 20 ℃.
As a preferable scheme of the water-based strippable nano-composite polyurethane coating, the magnetic adsorbent is Prussian blue coated cobalt ferrite nano-particles.
As a preferable mode of the water-based strippable nano-composite polyurethane coating, the particle size of the magnetic adsorbent is 30-900 nm.
As a preferable scheme of the water-based strippable nano-composite polyurethane coating, the preparation method of the magnetic adsorbent comprises the following steps:
the first step: feCl is added 3 ·6H 2 O、CoCl 2 ·6H 2 Adding O and anhydrous sodium acetate into ethylene glycol, mixing and stirring for 0.1 to 4 hours to obtain a first solution;
and a second step of: adding polyethylene glycol into the first solution, mixing and stirring for 0.1 to 4 hours to obtain a second solution;
and a third step of: transferring the second solution into a high-pressure reaction kettle, sealing the high-pressure reaction kettle, heating to 200 ℃, and reacting the second solution in the high-pressure reaction kettle for 1 to 18 hours;
fourth step: after the reaction is completed, cooling the high-pressure reaction kettle to room temperature, and separating and collecting cobalt ferrite particles in the high-pressure reaction kettle through an externally applied magnetic field;
fifth step: washing the cobalt ferrite particles with absolute ethanol and deionized water in sequence and drying the cobalt ferrite particles for 1 to 5 hours;
sixth step: dispersing the dried cobalt ferrite particles in an aqueous solution with the pH of 1 to 6, adding 0.1 to 110mM potassium ferrocyanide into the aqueous solution dispersed with the cobalt ferrite particles, mixing and stirring for 0.5 to 6 hours to obtain a third solution;
seventh step: and separating and collecting the Prussian blue coated cobalt ferrite nano particles in the third solution through an external magnetic field, and washing the Prussian blue coated cobalt ferrite nano particles with deionized water to obtain the magnetic adsorbent.
In the invention, the magnetic adsorbent can adsorb radionuclides, so that the separation of the magnetic adsorbent and the radionuclides is easy to realize, and the treatment amount of nuclear waste can be reduced.
As a preferred embodiment of the aqueous strippable nanocomposite polyurethane coating according to the present invention, the drying temperature is 40 to 95 ℃.
In the invention, the chemical formula of Prussian blue in the Prussian blue coated cobalt ferrite nanoparticle is Fe 4 [Fe(CN) 6 ] 3 。
In order to achieve the second object of the present invention, the following technical scheme is adopted:
the preparation method comprises the steps of adding the aqueous polyurethane emulsion and the magnetic adsorbent into water, mixing and stirring, and dispersing to obtain the aqueous strippable nano-composite polyurethane coating.
As a preferable scheme of the preparation method of the water-based strippable nano-composite polyurethane coating, the stirring speed is 90-1200 r/min, and the dispersing speed is 90-1200 r/min for 0.3-3 h.
The invention has the beneficial effects that:
(1) The water-based strippable nano-composite polyurethane coating prepared by the invention has strong radionuclide adsorption capability;
(2) The water-based strippable nano composite polyurethane coating prepared by the invention has strong detergency and is easy to separate pollutants;
(3) The water-based strippable nano composite polyurethane coating prepared by the invention is environment-friendly, the prepared raw materials are easy to obtain, and the coating is suitable for industrial mass production.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
Example 1
An aqueous strippable nano-composite polyurethane coating, comprising the following components:
50g of water;
800g of aqueous polyurethane emulsion;
110g of magnetic adsorbent.
The preparation method of the magnetic adsorbent comprises the following steps of:
the first step: 8g of FeCl 3 ·6H 2 O, 7g of CoCl 2 ·6H 2 Adding O and 12g of anhydrous sodium acetate into 200ml of ethylene glycol, mixing and stirring for 2 hours to obtain a first solution;
and a second step of: 13g of polyethylene glycol is added into the first solution, mixed and stirred for 2 hours to obtain a second solution;
and a third step of: transferring the second solution into a stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing the stainless steel high-pressure reaction kettle, heating to 200 ℃, and reacting the second solution in the stainless steel high-pressure reaction kettle for 12 hours;
fourth step: after the reaction is completed, cooling the stainless steel high-pressure reaction kettle to room temperature, and separating and collecting black cobalt ferrite nano particles in the stainless steel high-pressure reaction kettle through an external magnetic field;
fifth step: washing cobalt ferrite nano particles by using absolute ethyl alcohol and deionized water successively and drying the cobalt ferrite nano particles at the temperature of 70 ℃ for 3 hours;
sixth step: dispersing the dried cobalt ferrite nano particles in an aqueous solution with the pH value of 4, wherein the concentration of the cobalt ferrite nano particles is 12g/L, adding a certain amount of 35mM potassium ferrocyanide into the aqueous solution with the dispersed cobalt ferrite nano particles, mixing and stirring for 2.5 hours to obtain a third solution;
seventh step: and separating and collecting the cobalt ferrite nano particles coated by Prussian blue in the third solution through an external magnetic field, and washing the cobalt ferrite nano particles coated by Prussian blue by deionized water until the washing liquid is colorless, thereby obtaining the magnetic adsorbent.
The preparation method of the water-based strippable nanocomposite polyurethane coating of the embodiment 1 comprises the following steps: 800g of aqueous polyurethane emulsion and 110g of magnetic adsorbent are added into a 3L container filled with 50g of water, mixed and stirred at the rotating speed of 600r/min, and then dispersed for 35min at the rotating speed of 600r/min, so that the aqueous strippable nano composite polyurethane coating is obtained.
Example 2
An aqueous strippable nano-composite polyurethane coating, comprising the following components:
20g of water;
750g of aqueous polyurethane emulsion;
30g of magnetic adsorbent.
The preparation method of the magnetic adsorbent comprises the following steps of:
the first step: 1g of FeCl 3 ·6H 2 O, 0.1g of CoCl 2 ·6H 2 Adding O and 1g of anhydrous sodium acetate into 5ml of ethylene glycol, mixing and stirring for 0.1h to obtain a first solution;
and a second step of: adding 0.3g of polyethylene glycol into the first solution, mixing and stirring for 0.1h to obtain a second solution;
and a third step of: transferring the second solution into a stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing the stainless steel high-pressure reaction kettle, heating to 200 ℃, and reacting the second solution in the stainless steel high-pressure reaction kettle for 1h;
fourth step: after the reaction is completed, cooling the stainless steel high-pressure reaction kettle to room temperature, and separating and collecting black cobalt ferrite nano particles in the stainless steel high-pressure reaction kettle through an external magnetic field;
fifth step: washing cobalt ferrite nano particles by using absolute ethyl alcohol and deionized water successively and drying the cobalt ferrite nano particles at the temperature of 40 ℃ for 1h;
sixth step: dispersing the dried cobalt ferrite nano particles in an aqueous solution with the pH value of 5, wherein the concentration of the cobalt ferrite nano particles is 0.1g/L, adding a certain amount of 0.1mM potassium ferrocyanide into the aqueous solution with the dispersed cobalt ferrite nano particles, mixing and stirring for 0.5h to obtain a third solution;
seventh step: and separating and collecting the cobalt ferrite nano particles coated by Prussian blue in the third solution through an external magnetic field, and washing the cobalt ferrite nano particles coated by Prussian blue by deionized water until the washing liquid is colorless, thereby obtaining the magnetic adsorbent.
The preparation method of the water-based strippable nanocomposite polyurethane coating of the embodiment 2 comprises the following steps: 750g of aqueous polyurethane emulsion and 30g of magnetic adsorbent are added into a 3L container filled with 20g of water, mixed and stirred at the rotating speed of 90r/min, and then dispersed for 0.3h at the rotating speed of 90r/min, so that the aqueous strippable nano composite polyurethane coating is obtained.
Example 3
An aqueous strippable nano-composite polyurethane coating, comprising the following components:
80g of water;
900g of aqueous polyurethane emulsion;
170g of magnetic adsorbent.
The preparation method of the magnetic adsorbent comprises the following steps of:
the first step: 20g of FeCl 3 ·6H 2 O, 12g of CoCl 2 ·6H 2 Adding O and 25g of anhydrous sodium acetate into 500ml of ethylene glycol, mixing and stirring for 4 hours to obtain a first solution;
and a second step of: adding 25g of polyethylene glycol into the first solution, mixing and stirring for 4 hours to obtain a second solution;
and a third step of: transferring the second solution into a stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing the stainless steel high-pressure reaction kettle, heating to 200 ℃, and reacting the second solution in the stainless steel high-pressure reaction kettle for 18 hours;
fourth step: after the reaction is completed, cooling the stainless steel high-pressure reaction kettle to room temperature, and separating and collecting black cobalt ferrite nano particles in the stainless steel high-pressure reaction kettle through an external magnetic field;
fifth step: washing cobalt ferrite nano particles by using absolute ethyl alcohol and deionized water successively and drying the cobalt ferrite nano particles at the temperature of 95 ℃ for 5 hours;
sixth step: dispersing the dried cobalt ferrite nano particles in an aqueous solution with the pH of 6, wherein the concentration of the cobalt ferrite nano particles is 19g/L, adding a certain amount of 110mM potassium ferrocyanide into the aqueous solution with the dispersed cobalt ferrite nano particles, mixing and stirring for 6 hours to obtain a third solution;
seventh step: and separating and collecting the cobalt ferrite nano particles coated by Prussian blue in the third solution through an external magnetic field, and washing the cobalt ferrite nano particles coated by Prussian blue by deionized water until the washing liquid is colorless, thereby obtaining the magnetic adsorbent.
The preparation method of the water-based strippable nanocomposite polyurethane coating of the embodiment 3 comprises the following steps: 900g of aqueous polyurethane emulsion and 170g of magnetic adsorbent are added into a 3L container filled with 80g of water, mixed and stirred at a rotating speed of 1200r/min, and then dispersed for 3 hours at the rotating speed of 1200r/min, so that the aqueous strippable nano composite polyurethane coating is obtained.
Comparative example 1
An aqueous strippable coating comprising the following components:
50g of water;
800g of aqueous polyurethane emulsion.
The preparation method of the water-based strippable coating of the comparative example 1 comprises the following steps: 800g of the aqueous polyurethane emulsion is added into a 3L container filled with 50g of water, mixed and stirred at the rotating speed of 600r/min, and dispersed for 35min at the rotating speed of 600r/min, so as to obtain the aqueous strippable coating.
Example 4
Surface decontamination Performance test evaluation
Preparation of Cs + The concentration of the simulated pollution liquid is 1.3ppm, the size of the test sample plate is 304 stainless steel plate of 100mm multiplied by 50mm multiplied by 2mm, 1mL of the pollution liquid is dripped into the center of the plate, the whole 304 stainless steel plate surface is naturally leveled by the pollution liquid, and the plate is dried for 24 hours at room temperature. The aqueous strippable nanocomposite polyurethane coating of examples 1 to 3 and the aqueous strippable coating of comparative example 1 were respectively brushed onto the contaminated surfaces, the coatings were naturally dried, and after the strippable coating was removed, the 304 stainless steel plate was rinsed with deionized water and the rinse solution was collected, and the collected rinse solution was tested for Cs using ICP-MS + Content of Cs on stainless steel sheet before and after peeling according to peelable coating + Difference in content and Cs before stripping of the peelable coating + The content percentage is calculated to obtain the surface Cs of the stainless steel plate + Decontamination rate, test results of decontamination rate are shown in table 1:
table 1 table of surface decontamination test results for peelable coatings
| Using paints | Decontamination rate/% |
| Example 1 | 97 |
| Example 2 | 95.3 |
| Example 3 | 98.5 |
| Comparative example 1 | 42 |
As can be seen from the results of table 1, the detergency ratio of the aqueous strippable nanocomposite polyurethane coatings of examples 1 to 3 was significantly improved over that of the aqueous strippable coating of comparative example 1, and the detergency ratio of the aqueous strippable nanocomposite polyurethane coatings of examples 1 to 3 was more than 95%.
The above embodiments are merely embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The water-based strippable nano-composite polyurethane coating is characterized by comprising the following components in parts by weight:
20-80 parts of water;
750-900 parts of aqueous polyurethane emulsion;
30-170 parts of magnetic adsorbent;
wherein the particle size of the magnetic adsorbent is 30 to 900nm;
the preparation method of the magnetic adsorbent comprises the following steps:
the first step: feCl is added 3 ·6H 2 O、CoCl 2 ·6H 2 Adding O and anhydrous sodium acetate into ethylene glycol, mixing and stirring for 0.1 to 4 hours to obtain a first solution;
and a second step of: adding polyethylene glycol into the first solution, mixing and stirring for 0.1 to 4 hours to obtain a second solution;
and a third step of: transferring the second solution into a high-pressure reaction kettle, sealing the high-pressure reaction kettle, heating to 200 ℃, and reacting the second solution in the high-pressure reaction kettle for 1 to 18 hours;
fourth step: after the reaction is completed, cooling the high-pressure reaction kettle to room temperature, and separating and collecting cobalt ferrite particles in the high-pressure reaction kettle through an externally applied magnetic field;
fifth step: washing the cobalt ferrite particles with absolute ethanol and deionized water in sequence and drying the cobalt ferrite particles for 1 to 5 hours; the drying temperature is 40 to 95 ℃;
sixth step: dispersing the dried cobalt ferrite particles in an aqueous solution with the pH of 1 to 6, adding 0.1 to 110mM potassium ferrocyanide into the aqueous solution dispersed with the cobalt ferrite particles, mixing and stirring for 0.5 to 6 hours to obtain a third solution;
seventh step: and separating and collecting the Prussian blue coated cobalt ferrite nano particles in the third solution through an external magnetic field, and washing the Prussian blue coated cobalt ferrite nano particles with deionized water to obtain the magnetic adsorbent.
2. The aqueous strippable nanocomposite polyurethane coating of claim 1, wherein the aqueous polyurethane emulsion has a glass transition temperature of from-60 to 20 ℃.
3. The aqueous strippable nanocomposite polyurethane coating of claim 1, wherein the magnetic adsorbent is Prussian blue coated cobalt ferrite nanoparticles.
4. The aqueous strippable nanocomposite polyurethane coating according to any one of claims 1 to 3, wherein the preparation method comprises the steps of adding the aqueous polyurethane emulsion and the magnetic adsorbent into water, mixing and stirring, and dispersing to obtain the aqueous strippable nanocomposite polyurethane coating.
5. The aqueous strippable nanocomposite polyurethane coating according to claim 4, wherein the rotational speed of the agitation is from 90 to 1200r/min and the rotational speed of the dispersion is from 90 to 1200r/min for a period of from 0.3 to 3 hours.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006087950A1 (en) * | 2005-02-17 | 2006-08-24 | National Institute Of Advanced Industrial Science And Technology | Ultrafine particle of prussian blue-type metal complex, dispersion liquid thereof, and their production methods |
| CN102827537A (en) * | 2012-09-15 | 2012-12-19 | 合肥华清金属表面处理有限责任公司 | Aqueous normal temperature curing peelable paint and preparation method of paint |
| JP2013170948A (en) * | 2012-02-21 | 2013-09-02 | Green Bio Jp | Removal method of radioactive cesium |
| KR20170125597A (en) * | 2016-05-04 | 2017-11-15 | 인하대학교 산학협력단 | A adsorbent based on hollow prussian blue magnetic nanoparticles for radioactive cesium, and method of manufacturing the same |
| CN111974453A (en) * | 2020-05-28 | 2020-11-24 | 武汉工程大学 | Cobalt iron prussian blue derivative/carbon nanofiber composite material and preparation method and application thereof |
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- 2022-10-26 CN CN202211319723.9A patent/CN115678401B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006087950A1 (en) * | 2005-02-17 | 2006-08-24 | National Institute Of Advanced Industrial Science And Technology | Ultrafine particle of prussian blue-type metal complex, dispersion liquid thereof, and their production methods |
| JP2013170948A (en) * | 2012-02-21 | 2013-09-02 | Green Bio Jp | Removal method of radioactive cesium |
| CN102827537A (en) * | 2012-09-15 | 2012-12-19 | 合肥华清金属表面处理有限责任公司 | Aqueous normal temperature curing peelable paint and preparation method of paint |
| KR20170125597A (en) * | 2016-05-04 | 2017-11-15 | 인하대학교 산학협력단 | A adsorbent based on hollow prussian blue magnetic nanoparticles for radioactive cesium, and method of manufacturing the same |
| CN111974453A (en) * | 2020-05-28 | 2020-11-24 | 武汉工程大学 | Cobalt iron prussian blue derivative/carbon nanofiber composite material and preparation method and application thereof |
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