CN112852203B - Zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint - Google Patents
Zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint Download PDFInfo
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- CN112852203B CN112852203B CN202110135296.8A CN202110135296A CN112852203B CN 112852203 B CN112852203 B CN 112852203B CN 202110135296 A CN202110135296 A CN 202110135296A CN 112852203 B CN112852203 B CN 112852203B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
Abstract
The invention discloses a zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water paint, which comprises the following steps: step 1: dissolving 3.5g of drying oil fatty acid into an organic solvent, and adding 50g of zinc powder; step 2: then adding 200mL of deionized water in which 2.0g of polyvinylpyrrolidone, 1.5g of sodium dodecyl benzene sulfonate and 1.0g of polyoxyethylene octyl phenol ether-10 are dissolved into the reaction liquid to obtain emulsion suspension; and step 3: filtering the emulsion suspension to obtain primary coated zinc powder; and 4, step 4: dissolving 1.5g of wrapping agent into 25mL of ethyl acetate, and adding the zinc powder; and 4, step 4: adding hot water solution dissolved with 2.0g of polyvinylpyrrolidone, 2.2g of tween-80 and 0.4g of span-80 to obtain emulsion suspension again; step 6: and filtering, washing and drying the emulsion suspension to obtain secondary coated zinc powder. The method can effectively inhibit the hydrogen evolution behavior of the zinc powder in the water paint without influencing the conductivity of the zinc powder.
Description
Technical Field
The invention relates to the technical field of chemical coatings, in particular to a zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint.
Background
In recent years, with the gradual enhancement of global environmental protection consciousness and the stricter environmental protection policies of all parts of China, the trend of the water-based paint is more and more obvious, and the water-based paint taking water as a main solvent occupies more and more important market positions. Environmental protection and corrosion prevention are two major characteristics of the development of the water paint, in order to improve the corrosion protection performance of the water paint, a cathodic protection technology of a sacrificial anode is usually assisted, metal zinc with a standard electrode potential of about-0.4V is added into a paint liquid, when a material is corroded, the metal zinc preferentially loses electrons, and metal iron is protected. However, the metal zinc electrode has a very low potential and is very easy to react with water to generate hydrogen in the water-based paint, so that the corrosion resistance of the paint liquid is reduced, and a large amount of hydrogen is separated out to cause a large safety risk. Therefore, suppressing the hydrogen evolution behavior of zinc powders in aqueous paints has become an urgent problem to be solved at present.
Disclosure of Invention
The invention aims to provide a zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint, and aims to solve the problems that the corrosion resistance of paint liquid is reduced and a great amount of hydrogen evolution causes great safety risk because the zinc powder added in the existing water-based paint is easy to react with water for hydrogen evolution.
In order to achieve the purpose, the invention provides the following technical scheme:
a zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water paint comprises the following steps:
step 1: dissolving 3.5g of dry oil fatty acid or polymethyl methacrylate into 40mL of organic solvent, adding 50g of zinc powder, and fully and uniformly mixing to obtain a first reaction solution;
step 2: adding 200mL of deionized water in which 2.0g of polyvinylpyrrolidone, 1.5g of sodium dodecyl benzene sulfonate and 1.0g of polyoxyethylene octyl phenol ether-10 are dissolved into the first reaction liquid, and fully and uniformly mixing to obtain an emulsion suspension;
and step 3: filtering the emulsion suspension, washing the filter residue with water for three times, and drying to obtain primary coated zinc powder;
and 4, step 4: adding 1.5g of wrapping agent into a flask filled with 25mL of ethyl acetate, heating until the wrapping agent is completely dissolved, adding the zinc powder subjected to primary wrapping, and fully and uniformly mixing to obtain a second reaction solution;
and 5: adding 180mL of hot water in which 2.0g of polyvinylpyrrolidone, 2.2g of tween-80 and 0.4g of span-80 are dissolved into the second reaction solution, and fully and uniformly mixing to obtain an emulsion suspension again;
step 6: and (5) cooling the emulsion suspension obtained in the step (5) to room temperature, and filtering, washing and drying to obtain secondary coated zinc powder.
Preferably, in the step 1, the drying oil fatty acid is one or more of linoleic acid and eleostearic acid.
Preferably, in the step 2, the fully mixing specifically comprises: the mixture was stirred for 60min at a stirring speed of 1500rpm using a mechanical stirrer.
Preferably, in the step 4, the coating agent is one or more of bazedoary, stearic acid and octadecylamine.
Preferably, in the step 4, the heating temperature is less than 85 degrees.
Preferably, in the step 5, the fully mixing specifically comprises: the mixture was stirred for 40min at a stirring speed of 1500rpm using a mechanical stirrer.
Preferably, in the step 3, the drying conditions are as follows: air-blast drying at 60 deg.C for 12 h.
Preferably, in the step 6, the drying conditions are: air-blast drying at 60 deg.C for 12 h.
By adopting the technical scheme, the invention has the following beneficial effects:
the application of the invention can effectively inhibit the hydrogen evolution behavior of the zinc powder in the water paint by carrying out secondary coating treatment on the zinc powder, and does not influence the conductivity of the zinc powder doped in the paint liquid.
Drawings
FIG. 1 is a flow chart of a zinc powder coating method for inhibiting the hydrogen evolution behavior of zinc powder in an aqueous paint according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a zinc powder hydrogen evolution quantity testing device.
Detailed Description
The invention is described in further detail below with reference to the following figures and embodiments:
as shown in fig. 1, a zinc powder coating method for inhibiting the hydrogen evolution behavior of zinc powder in an aqueous paint comprises the following steps:
step 1: dissolving 3.5g of dry oil fatty acid or polymethyl methacrylate into 40mL of organic solvent, adding 50g of zinc powder, and fully and uniformly mixing to obtain a first reaction solution;
wherein the drying oil fatty acid is one or more of linoleic acid and eleostearic acid, and the organic solvent adopts ethyl acetate or dichloromethane.
Step 2: adding 200mL of deionized water in which 2.0g of polyvinylpyrrolidone, 1.5g of sodium dodecyl benzene sulfonate and 1.0g of polyoxyethylene octyl phenol ether-10 are dissolved into the first reaction liquid, and fully and uniformly mixing to obtain an emulsion suspension;
wherein, the fully mixing is as follows: the mixture was stirred for 60min at a stirring speed of 1500rpm using a mechanical stirrer.
And step 3: filtering the emulsion suspension, washing the filter residue with water for three times, and drying to obtain primary coated zinc powder;
wherein, the drying conditions are as follows: air-blast drying at 60 deg.C for 12 h.
And 4, step 4: adding 1.5g of wrapping agent into a flask filled with 25mL of ethyl acetate, heating until the wrapping agent is completely dissolved, adding the zinc powder subjected to primary wrapping, and fully and uniformly mixing to obtain a second reaction solution;
wherein the coating agent is one or more of bazedoary wax, stearic acid and octadecylamine, and the heating temperature is less than 85 ℃.
And 5: adding 180mL of hot water in which 2.0g of polyvinylpyrrolidone, 2.2g of tween-80 and 0.4g of span-80 are dissolved into the second reaction solution, and fully and uniformly mixing to obtain an emulsion suspension again;
wherein, the fully mixing is as follows: the mixture was stirred for 40min at a stirring speed of 1500rpm using a mechanical stirrer.
Step 6: and (5) cooling the emulsion suspension obtained in the step (5) to room temperature, and filtering, washing and drying to obtain secondary coated zinc powder.
After stirring is finished, the stirring speed is reduced, and after the solution in the flask is cooled to room temperature, the obtained coated zinc powder is subjected to forced air drying at 60 ℃ for 12 hours.
Zinc powder hydrogen evolution quantity testing method
Referring to the device in FIG. 2, a graduated test tube is filled with water, inverted and the liquid level is adjusted to 50mL, 5.0g of zinc powder is bottled in a 150mL conical bottle, 70mL of 0.2mol/L hydrochloric acid aqueous solution is added, the conical bottle is placed on a magnetic stirrer, the magnetic stirrer is started, the heating temperature is set to 50 ℃, the liquid level height in the inverted test tube is observed every 5min, the hydrogen evolution amount is recorded, the total time is 30min, and meanwhile, a blank test is carried out.
As shown in Table 1, the hydrogen evolution amount of the zinc powder subjected to coating treatment is 1.5mL in 30min, which is reduced by 20mL compared with that of the zinc powder not coated, and the hydrogen evolution behavior of the zinc powder is effectively inhibited.
TABLE 1 test results of hydrogen evolution
Conductivity test method for coated zinc powder
(1) Saline soak test: adding 50mL of 3.5% sodium chloride solution and 2.0g of coated zinc powder into a 100mL PET small bottle, screwing the bottle cap, opening the cap once every 12H, and adjusting the air pressure in the bottle to be consistent with the atmospheric pressure to prevent excessive H from being generated in the bottle2And (5) expanding the bottle, and observing the coated zinc powder after soaking for 5 days. The results show that the coating on the surface of the zinc powder peels off, the zinc powder is exposed and the conductivity is restored, which indicates that the coating does not affect the conductivity of the zinc powder.
(2) Salt spray test: adding the coated zinc powder into water-based paint to prepare zinc-rich water-based paint, spraying the water-based paint on the surface of the pretreated iron sheet by using a paint spraying device, then placing the sprayed iron sheet into an oven to dry and solidify at 300 ℃, then making scratches on the surface of the iron sheet, and finally placing the iron sheet into a Y/Q-250 type salt spray testing machine to perform a salt spray test. As shown in table 2, the salt spray corrosion resistance time of the coating prepared with the coated zinc powder was consistent with that of the original zinc powder, indicating that the coating process did not affect the conductivity of the zinc powder.
Table 2 results of salt spray test
| Class of zinc powder | Classes of paint liquids | Coating thickness (μm) | Salt spray corrosion resistance time (sky) |
| Original zinc powder | Water paint | 13.5 | 13.0 |
| Coated zinc powder | Water paint | 31.2 | 13.0 |
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (6)
1. A zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water paint is characterized by comprising the following steps:
step 1: dissolving 3.5g of dry oil fatty acid or polymethyl methacrylate into 40mL of organic solvent, adding 50g of zinc powder, and fully and uniformly mixing to obtain a first reaction solution, wherein the dry oil fatty acid is one or more of linoleic acid and eleostearic acid;
step 2: adding 200mL of deionized water in which 2.0g of polyvinylpyrrolidone, 1.5g of sodium dodecyl benzene sulfonate and 1.0g of polyoxyethylene octyl phenol ether-10 are dissolved into the first reaction liquid, and fully and uniformly mixing to obtain an emulsion suspension;
and step 3: filtering the emulsion suspension, washing the filter residue with water for three times, and drying to obtain primary coated zinc powder;
and 4, step 4: adding 1.5g of wrapping agent into a flask filled with 25mL of ethyl acetate, heating until the wrapping agent is completely dissolved, adding the primarily wrapped zinc powder, and fully and uniformly mixing to obtain a second reaction solution, wherein the wrapping agent is one or more of baxi wax, stearic acid and octadecylamine;
and 5: adding 180mL of hot water in which 2.0g of polyvinylpyrrolidone, 2.2g of tween-80 and 0.4g of span-80 are dissolved into the second reaction solution, and fully and uniformly mixing to obtain an emulsion suspension again;
step 6: and (5) cooling the emulsion suspension obtained in the step (5) to room temperature, and filtering, washing and drying to obtain secondary coated zinc powder.
2. The zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint according to claim 1, wherein in the step 2, the fully mixing is specifically as follows: the mixture was stirred for 60min at a stirring speed of 1500rpm using a mechanical stirrer.
3. The zinc powder coating method for suppressing the hydrogen evolution behavior of zinc powder in an aqueous paint as defined in claim 1, wherein in said step 4, the heating temperature is less than 85 ℃.
4. The zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint according to claim 1, wherein in the step 5, the fully mixing is specifically as follows: the mixture was stirred for 40min at a stirring speed of 1500rpm using a mechanical stirrer.
5. The zinc powder coating method for suppressing the hydrogen evolution behavior of zinc powder in an aqueous paint as defined in claim 1, wherein in said step 3, the drying conditions are: air-blast drying at 60 deg.C for 12 h.
6. The zinc powder coating method for suppressing the hydrogen evolution behavior of zinc powder in an aqueous paint as defined in claim 1, wherein in said step 6, the drying conditions are: air-blast drying at 60 deg.C for 12 h.
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| CN202110135296.8A CN112852203B (en) | 2021-02-01 | 2021-02-01 | Zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint |
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| CN202110135296.8A CN112852203B (en) | 2021-02-01 | 2021-02-01 | Zinc powder coating method capable of inhibiting hydrogen evolution behavior of zinc powder in water-based paint |
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| CN112852203B true CN112852203B (en) | 2022-06-03 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1513628A (en) * | 2003-05-21 | 2004-07-21 | 昆明理工恒达科技有限公司 | Production method of scale shpared zinc powler |
| CN103694748A (en) * | 2013-12-17 | 2014-04-02 | 北京北矿锌业有限责任公司 | Surface modification method of metallic pigment |
| CN204545735U (en) * | 2015-03-07 | 2015-08-12 | 浙江科得力新材料有限公司 | A kind of flux cored wire wire-drawing equipment of interior zinc covering powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI395736B (en) * | 2006-11-08 | 2013-05-11 | Dow Agrosciences Llc | Heteroaryl (substituted) alkyl n-substituted sulfoximines as insecticides |
| CN103337624B (en) * | 2013-06-28 | 2016-08-24 | 风帆有限责任公司 | A kind of lead-acid accumulator negative pole lead paste suppressing liberation of hydrogen and preparation method |
| CN109686977A (en) * | 2018-11-16 | 2019-04-26 | 超威电源有限公司 | A kind of acid accumulator negative pole lead material inhibiting liberation of hydrogen |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1513628A (en) * | 2003-05-21 | 2004-07-21 | 昆明理工恒达科技有限公司 | Production method of scale shpared zinc powler |
| CN103694748A (en) * | 2013-12-17 | 2014-04-02 | 北京北矿锌业有限责任公司 | Surface modification method of metallic pigment |
| CN204545735U (en) * | 2015-03-07 | 2015-08-12 | 浙江科得力新材料有限公司 | A kind of flux cored wire wire-drawing equipment of interior zinc covering powder |
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