CN115216204A - Heavy-duty anticorrosive paint with low-rusted surface treatment and preparation method thereof - Google Patents
Heavy-duty anticorrosive paint with low-rusted surface treatment and preparation method thereof Download PDFInfo
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- 239000003973 paint Substances 0.000 title claims description 16
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 238000004381 surface treatment Methods 0.000 title abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 87
- 239000011248 coating agent Substances 0.000 claims abstract description 83
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229920005989 resin Polymers 0.000 claims abstract description 33
- 239000011347 resin Substances 0.000 claims abstract description 33
- 239000002904 solvent Substances 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 30
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- 239000011701 zinc Substances 0.000 claims abstract description 18
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/06—Polystyrene
-
- 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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
-
- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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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
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
A heavy-duty anticorrosive coating with a low-rusted surface treatment and a preparation method thereof relate to the technical field of metal material surface corrosion prevention. Comprises scale-shaped metal zinc powder, resin, dispersant and solvent, wherein D of the scale-shaped metal zinc powder 50 Within the range of 2-40 μm, the thickness is less than 0.2 μm; in the coating formed after the surface of the substrate is coated, the flaky metal zinc is uniformly wrapped by resin to form a flaky and alternately superposed organizational structure. According to the characteristics of the scaly metal powder, the invention needs to be matched with matched coating material proportion and process optimization, and realizes that the coating has a laminated shape and is alternately superposedThe tissue structure of the coating is used for performing low-treatment rusty surface or non-rusty surface coating on the surface of the steel material, so that the long-acting corrosion prevention effect is achieved. The invention can be directly coated on the surface of a substrate for removing oil, dirt and rust, so that the coating convenience and the long-acting corrosion resistance of the coating are unified.
Description
Technical Field
The invention relates to the technical field of metal material surface corrosion prevention, in particular to a heavy-duty anticorrosive coating with low rusty surface treatment and a preparation method thereof.
Background
In order to deal with steel corrosion, steel corrosion is prevented in various ways, and the most important is to add an anticorrosive coating on the surface of a steel material. The paint is composed of high molecular polymer and filler, and is coated on the surface of a substrate to form a corrosion-resistant coating. The coating is covered on the surface of the steel so as to shield the steel and isolate the steel from contacting with a corrosive medium, thereby achieving the purpose of corrosion prevention. The zinc-rich paint is formed by adding metal zinc powder as a filler into a high molecular polymer, and is the most widely used anticorrosion measure in China at present.
With the development of technology, the heavy anti-corrosion coating used at present is mainly a zinc-rich coating prepared by adding spherical powder. For spherical powder, the theoretical packing fraction is 68%, and the porosity is 32%, and the shielding property is poor. Meanwhile, when the volume of the spherical particles is fixed, the surface area is the smallest, so that the filler particles are easy to precipitate, and the coating effect of the coating is greatly reduced.
In addition, the corrosion on the surface of the steel, namely the electrode potential of the oxide is higher than that of pure iron, and the oxide and the iron of the substrate form a primary battery due to the existence of the oxide, so that an electrochemical reaction is generated, the iron of the substrate is oxidized into the oxide, and meanwhile, the oxide layer is thickened, and the corrosion prevention effect of the coating is further reduced. In order to ensure the anticorrosive effect of the coating, the surface of the matrix needs to be degreased, polluted, rusted and the like before the anticorrosive coating is constructed, and the rusts of the anticorrosive coating need to be completely removed. The rust removal work is not only harsh in environment, but also the cost of the rust removal work accounts for about 50% of the whole coating cost, and particularly, for large and complex components, when the rust removal cannot reach the Sa21/2 level specified in GB/T8923.1, the corrosion prevention effect of the coating is obviously reduced, the corrosion prevention cost of equipment and facilities is seriously increased, and the service life of the equipment and facilities is shortened.
Disclosure of Invention
The invention aims to solve the problems of the service life and the construction of the existing heavy-duty anticorrosive paint, and provides a heavy-duty anticorrosive paint with a low-treatment rusty surface and a preparation method thereof, wherein the low-treatment is to only remove oil stains and rust on the surface of a substrate without deeply treating an oxide layer, and the paint can be constructed on the rusty surface, so that the requirement of surface treatment is reduced, and the long-acting anticorrosive effect can be achieved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the heavy-duty anticorrosive coating with low rusty surface treatment consists of scaly zinc metal powder, resin, dispersant and solvent, wherein D of the scaly zinc metal powder 50 In the range of 2-40 μm, the thickness is less than 0.2 μm, and the ratio of the size of the powder particles in the length direction to the size of the powder particles in the thickness direction (namely the diameter-thickness ratio) is more than 10; in the coating formed after the surface of the substrate is coated, the scaly metal zinc is uniformly wrapped by resin to form a lamellar and alternately superposed organizational structure, and the thickness of the resin layer is controlled to be less than 0.5 mu m.
According to the characteristics of the scale-shaped metal powder, the invention needs to be matched with matched paint proportion and process optimization, realizes that the coating has a lamellar and alternately superposed organizational structure, and performs low-treatment rusty surface or non-rusty surface coating on the surface of the steel material to achieve the effect of long-acting corrosion prevention.
First, in terms of the coating composition, the coating layer is formed such that the weight ratio of the resin is 4 to 10% and the weight ratio of the flaky metallic zinc powder is 88 to 96% with respect to the nonvolatile component, and the remainder is the dispersant. The scale control of the flaky metal zinc powder is adapted to the resin amount in the proportion, when D of the filler powder is 50 When taking a low value, the amount of resin is taken to a higher value, and vice versa.
In the coating component, the resin is selected from epoxy resin, polystyrene resin, methyl acrylate or alkyd resin; the dispersant is selected from polyacrylamide, fatty acid polyglycol ester or methyl amyl alcohol; the solvent is selected from one mixture of acetone + xylene, butyl acetate + xylene + cyclohexanone, xylene + butanol.
Secondly, aiming at the aspect of the preparation process of the coating, the steps are as follows:
(1) Dissolution
According to the weight ratio of the resin to the solvent of 1: 5-20, the adding amount of the dispersing agent is 1-2% of the weight of the flaky metal zinc powder, the resin, the dispersing agent and the solvent are added into a container, and the container is stirred for 1-10 hours at 15-30 ℃, so that the polymer long chain of the resin is fully wetted and stretched with the solvent molecules in the solvent and is uniformly dispersed in the solvent;
(2) Pre-grinding
Adding the dissolved resin solution into grinding equipment for grinding for 1-10 hours, and properly adjusting the grinding time according to different grinding equipment; the grinding equipment comprises a ball mill, a stirring mill, a sand mill and the like, but the premise is that flaky metallic zinc powder particles are fully dispersed;
(3) Adding flaky metallic zinc powder for grinding
Adding the flaky metallic zinc powder into grinding equipment, continuously grinding for 2-20 hours, and properly adjusting the grinding time according to different grinding equipment;
(4) Standing the slurry
Pouring the ground slurry out, placing the slurry in a container for sealing, and placing the container for 2 to 20 hours at the temperature of between 15 and 30 ℃ to ensure that the solvent is fully wetted and diffused on the scale powder to eliminate the area which is not wrapped by the resin liquid;
(5) Continuously grinding
The slurry is continuously transferred into a grinding device and continuously ground for 1 to 10 hours; the grinding time can be properly adjusted according to different grinding equipment; in the grinding process, a proper amount of solvent can be added when the slurry is thickened; the viscosity of the slurry during milling was not less than 10 seconds (measured using a smear-4 viscosity cup);
(6) Detecting and packaging
And sampling and detecting the ground slurry, and sealing and packaging after the ground slurry is qualified.
The curing agent is required to be added into the two-component coating prepared from the epoxy resin before coating, and the method comprises the following specific steps:
(1) According to the weight ratio of 1:0.8 to 1.2, weighing 650 portions of polyamide, adding the polyamide and a solvent into a container, and stirring for 1 to 10 hours at a temperature of between 15 and 30 ℃; the solvent is the same as the solvent used for preparing the coating, and the weight ratio of 650 polyamide to the solvent is 1:2 to 5;
(2) The dissolved 650 polyamide is mixed with the paint, stirred for 0.1 to 2 hours, and then the painting is started.
Compared with the prior art, the invention has the beneficial effects that:
1. the scaly metal powder adopted by the invention is mainly characterized in that: the flaky metal zinc powder is arranged in a coating in a flaky manner, one dimension of three dimensions of the flaky metal zinc powder is in a submicron or nanometer level, and the other two dimensions are in a micron level, so that the special plane structure not only keeps better dispersibility of the micron-level powder, but also can exert the functional characteristics of the nano-level powder, has higher surface activity and can be effectively combined with other active groups. Therefore, the coating is compact, has obvious shielding effect, and is more densely attached to the surface of the metal substrate, thereby obtaining excellent antirust and anticorrosion performances. By adding the flaky metallic zinc powder, the coating manufacturability of the coating can be greatly improved, the film binding force of the coating is better, and the corrosion resistance is multiplied. Meanwhile, the invention can realize long-acting anticorrosion service life of the coating, and the coating can be directly coated on the surface of a substrate for removing oil, dirt and rust (the rust refers to a rust layer which has poor binding force with the surface of the substrate and is easy to fall off, and the rust layer which has strong binding force with the substrate under the rust does not need to be removed), so that the coating convenience and the long-acting anticorrosion performance of the coating are unified.
2. After the coating prepared by the invention forms a coating, the scaly metal zinc is uniformly wrapped by the resin to form a coating organizational structure of 'lamellar and alternate superposition'. The corrosion potential of the coating is lower than that of the iron of the substrate under various conditions, so that the electrode potential of the coating is ensured to be more negative, and the substrate is protected from being corroded. When the coating is coated on a rusted surface substrate, the electrode potential of the oxide on the rusted surface is positive, and the electrode potential of the coating is more negative than that of the substrate, so that the coating forms an anode of the galvanic cell, the oxide on the rusted surface is a cathode, and the coating is corroded instead of the substrate, thereby playing a role in protecting the substrate. More importantly, when the coating is locally damaged and the substrate is exposed, the corrosion of the substrate is inhibited due to the cathodic protection performance of the coating, so that the durable protection is formed.
3. After the coating is formed by the coating prepared by the invention, the organizational structure of the coating is as follows: the metal zinc sheets and the resin are arranged alternately layer by layer and are superposed layer by layer. The thickness of the resin layer depends on the addition amount of the resin and the uniform degree of the resin wrapped in the zinc metal. In the present invention, the thickness of the scale-like metallic zinc flake layer is controlled to be less than 0.2 μm, and the thickness of the resin layer is controlled to be less than 0.5 μm. The thickness of the resin layer directly affects the conductivity of the coating, i.e. tunneling (a thin insulating layer sandwiched between two metal conductors forms a tunnel junction for electrons. When the resin layer is smaller than a certain thickness, the metal zinc sheets are directly conducted, the coating is equivalent to a thermal zinc spraying coating, and the cathodic protection performance reaches the best.
4. Compared with the traditional zinc-rich coating, the anticorrosive coating prepared by the invention has the following characteristics: excellent cathodic protection performance. This requires that the conductivity between the zinc flakes in the coating is good and the thickness of the resin layer between the flakes is strictly controlled, i.e. the properties of the flake powder should be matched with the amount of resin added. In the case of flaky powder as filler, the lamellar layers are in contact with each other in a planar manner, and in the case of spherical zinc powder in a zinc-rich coating, the spherical layers are in point contact with each other. The conductivity between flaky zinc powder is difficult to achieve. Therefore, the conductivity among the flaky zinc powder endows the coating with excellent cathode protection performance, lays a foundation for rust surface construction, and is directly coated on rust to ensure that the active rust is inertized and hardened. However, since the flaky metal powders are in contact with each other in a planar manner, it is difficult to sufficiently disperse the flaky metal powders as compared with spherical powders, and therefore, the time for grinding and wetting between powder particles are considered in the production process. When the dispersion is insufficient, especially in the form of agglomerates, the properties of the coating are reduced and the requirements for rust-finishing are even not met.
Drawings
FIG. 1 is a schematic view of the texture of a coating prepared according to the present invention.
FIG. 2 is a sectional SEM image of a coating prepared according to the present invention.
FIG. 3 is a plot of the polarization of the coatings prepared according to the invention after various time salt spray tests.
FIG. 4 is the results of the national paint quality control inspection center testing of the coating samples prepared in accordance with the present invention.
FIG. 5 is a surface XRD test of coatings prepared according to the present invention after various time salt spray tests.
Detailed Description
The scale-like metallic zinc powder adopted by the invention is prepared by the equipment and the method disclosed in the Chinese patent application CN 111841771A. On the basis of earlier research, the invention applies the coating to the preparation of anticorrosive coatings.
Example 1
A preparation method of heavy anti-corrosive paint with low rusted surface treatment comprises the following steps:
(1) Dissolution
8g of epoxy resin, 80g of solvent (xylene + butanol) and 2.7g of fatty acid polyglycol ester are added into a container and stirred for 4 hours at 20 ℃, and the rotating speed of the stirrer is 40 revolutions per minute.
(2) Pre-grinding
The dissolved epoxy resin solution was added to the ball mill jar and ground for 4 hours.
(3) Adding flaky metallic zinc powder for ball milling
Addition of D 50 And (3) adding 180g of flaky metallic zinc powder with the thickness of less than 50nm and the particle size of 6 microns, and performing ball milling for 4 hours.
(4) Standing the slurry
The ball milled slurry was poured out, placed in a container and sealed, and left at 20 ℃ for 5 hours.
(5) Continuously grinding
And pouring the slurry into a ball milling tank for continuous ball milling, adding 30g of solvent, and grinding for 4 hours. The viscosity of the slurry was controlled at 10-20 seconds (measured using a coat-4 viscosity cup).
(6) 650 g of polyamide was taken, 30g of a solvent (xylene + butanol) was added, and the mixture was stirred at 20 ℃ for 4 hours.
To the slurry obtained in step (5), 650 dissolved polyamide was added and stirred for 0.5 hour.
(7) And removing the rust on the surface of the rusted steel piece by using an iron brush, brushing the prepared coating, and drying.
The coating prepared in this example has a structure diagram shown in fig. 1, and scaly metal zinc is uniformly wrapped by epoxy resin to form a lamellar and alternately stacked organization structure. As can be seen by SEM cross-section of the coating (fig. 2), the sheet metal is aligned in a surface parallel direction.
The polarization curves of the coatings prepared in example 1 after salt spray tests at different times are shown in fig. 3. The results show that after salt spray tests at different times, the corrosion potential of the coating is still lower than that of the substrate, namely the coating still has the function of cathodic protection on the substrate after salt spray corrosion at different times.
The samples prepared in example 1 were tested by the national paint quality control and inspection center (national institute of constant trust, changzhou, detection and authentication technology, inc.) and tested for 600 hours without blistering and rusting in the salt spray test as shown in FIG. 4. The XRD surface phase structure analysis of the sample surface discoloration after salt spray corrosion is shown in FIG. 5. The results show that the metallic zinc on the surface is gradually generated into zinc salt due to the salt spray corrosion at different times.
Example 2
A preparation method of a heavy-duty anticorrosive coating with low-treated rust surface comprises the following steps:
(1) Dissolution
10g of polystyrene resin, 50g of solvent (acetone + xylene) and 2g of polyacrylamide were added to a vessel and stirred at 20 ℃ for 6 hours at a stirrer speed of 40 rpm.
(2) Pre-grinding
The dissolved polystyrene resin solution was added to a sand mill and ground for 1 hour.
(3) Adding scale-shaped metal zinc powder into sand mill
Addition of D 50 And (3) flaky metallic zinc powder with the thickness of less than 0.1 μm and the addition amount of 115g, wherein the flaky metallic zinc powder is 15 μm and is ground for 2 hours.
(4) Standing the slurry
The ground slurry was poured out, placed in a container, closed, and left at 25 ℃ for 5 hours.
(5) Continuously grinding
Pouring the slurry into a sand mill to continuously grind for 1 hour. The viscosity of the slurry was controlled to be 20 seconds (measured using a coat-4 viscosity cup).
(6) Detecting and packaging
And sampling and detecting the ground slurry, and sealing and packaging after the ground slurry is qualified.
The anticorrosive paint prepared in this example has poorer performance than that of example 1.
Example 3
A preparation method of heavy anti-corrosive paint with low rusted surface treatment comprises the following steps:
(1) Dissolution
14g of methyl acrylate, 100g of solvent (butyl acetate + xylene + cyclohexanone) and 1.55g of methylpentanol are introduced into a vessel and stirred at 25 ℃ for 10 hours, the speed of the stirrer being 40 revolutions per minute.
(2) Pre-grinding
The dissolved acrylate solution was added to a ball mill jar and milled for 5 hours.
(3) Adding flaky metallic zinc powder for ball milling
Addition of D 50 And (3) flake-shaped metal zinc powder with the thickness of less than 0.1 μm and the addition amount of 152g is subjected to ball milling for 10 hours, wherein the flake-shaped metal zinc powder is 25 μm.
(4) Standing the slurry
The ball milled slurry was poured out, placed in a container, sealed, and left at 25 ℃ for 2 hours.
(5) Continuously grinding
The slurry was poured into a ball mill jar and milled continuously, and 20g of solvent was added and milled for 5 hours. The viscosity of the slurry was controlled at 10-20 seconds (measured using a coat-4 viscosity cup).
(6) Detecting and packaging
And sampling and detecting the ground slurry, and sealing and packaging after the ground slurry is qualified.
The anticorrosive paint prepared in this example has better performance than that of example 1.
Comparative example 1
Aiming at the influence of grinding time and the like in the preparation process of the coating, the following processes are listed, and the steps are as follows:
(1) Dissolution
8g of epoxy resin, 80g of solvent (xylene + butanol) and 2.7g of fatty acid polyglycol ester are added into a container and stirred for 0.5 hour at 20 ℃, and the rotating speed of a stirrer is 40 revolutions per minute.
(2) Adding flaky metallic zinc powder for ball milling
Addition of D 50 And the addition amount of the flaky metallic zinc powder with the thickness of less than 50nm of which is 180g is less than 6 microns, and the powder is subjected to ball milling for 2 hours.
(3) Standing the slurry
The ball milled slurry was poured out, placed in a container and sealed, and left at 20 ℃ for 2 hours.
(4) Continuously grinding
The slurry was poured into a ball mill pot and ball milled continuously, and 30g of solvent was added and milled for 1 hour. The viscosity of the slurry was controlled to be 20 seconds (measured using a coat-4 viscosity cup).
(5) 650 g of polyamide was taken, 30g of a solvent (xylene + butanol) was added, and the mixture was stirred at 20 ℃ for 0.5 hour.
And (5) adding the dissolved 650 polyamide into the slurry obtained in the step (4), stirring for 0.5 hour, coating and detecting.
Compared with example 1, the dissolution and ball milling time of the resin in this comparative example is obviously insufficient, and the largest defects of the coated sample are: the coating hardness was low, with example 1 dried to give a coating pencil hardness of >4H, whereas the comparative example dried to give a pencil hardness < H. The corresponding salt spray test results also show that the salt spray test time of the latter is <400 hours, significantly lower than the salt spray test of example 1 for 600 hours.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (7)
1. The heavy-duty anticorrosive coating with low-treated rust surface is characterized by comprising scale-shaped metal zinc powder, resin, a dispersing agent and a solvent, wherein D of the scale-shaped metal zinc powder 50 In the range of 2-40 mu mIn the enclosure, the thickness is less than 0.2 μm, and the ratio of the size of the powder particles in the length direction to the size of the powder particles in the thickness direction (namely the diameter-thickness ratio) is more than 10; in the coating formed after the surface of the substrate is coated, the scaly metal zinc is uniformly wrapped by resin to form a lamellar alternately-superposed organizational structure, and the thickness of the resin layer is controlled to be less than 0.5 mu m.
2. The heavy-duty anticorrosive coating with a low treated rust surface according to claim 1, wherein the coating layer is formed such that the resin accounts for 4 to 10% by weight, the scale-like metallic zinc powder accounts for 88 to 96% by weight, and the remainder is a dispersant, based on nonvolatile components.
3. The low treat rust heavy-duty anticorrosive coating of claim 1 or 2, wherein the resin is selected from the group consisting of epoxy resins, polystyrene resins, acrylates, and alkyd resins; the dispersant is selected from polyacrylamide, fatty acid polyglycol ester or methyl amyl alcohol; the solvent is selected from one mixture of acetone + xylene, butyl acetate + xylene + cyclohexanone, and xylene + butanol.
4. A process for preparing a heavy corrosion protective coating with a low treated rust surface according to any one of claims 1 to 3, characterized by the following steps:
(1) Dissolution
According to the weight ratio of the resin to the solvent of 1:5 to 20 percent, the adding amount of the dispersant is 1 to 2 percent of the weight of the flaky metallic zinc powder, and the resin, the dispersant and the solvent are added into a container and stirred for 1 to 10 hours at the temperature of between 15 and 30 ℃;
(2) Pre-grinding
Adding the dissolved resin solution into grinding equipment for grinding for 1-10 hours;
(3) Adding flaky metallic zinc powder for grinding
Adding the flaky metallic zinc powder into grinding equipment, and continuously grinding for 2-20 hours;
(4) Standing the slurry
Pouring the ground slurry out, placing the slurry in a container for sealing, and placing the container for 2 to 20 hours at a temperature of between 15 and 30 ℃;
(5) Continuously grinding
The slurry is continuously transferred into a grinding device and is continuously ground for 1 to 10 hours;
(6) Detecting and packaging
And sampling and detecting the ground slurry, and sealing and packaging after the ground slurry is qualified.
5. The method of claim 4, wherein the milling device is a ball mill, a stirred mill, or a sand mill.
6. The method of claim 4, wherein the viscosity of the slurry is controlled to be not less than 10 seconds during the grinding in step (5), as measured using a paint-4 viscosity cup.
7. The method of claim 4, wherein the two-component coating made of epoxy resin requires a curing agent to be added before application, comprising the steps of:
(1) According to the weight ratio of the curing agent to the epoxy resin of 1: weighing 650 parts of polyamide in a container together with a solvent, and stirring for 1-10 hours at 15-30 ℃; the solvent is the same as the solvent used for preparing the coating, and the weight ratio of 650 polyamide to the solvent is 1:2 to 5;
(2) The dissolved 650 polyamide is mixed with the paint, stirred for 0.1 to 2 hours, and then the painting is started.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116554760A (en) * | 2023-06-19 | 2023-08-08 | 安徽棠凝新材料科技有限公司 | Water-based epoxy heavy-duty anticorrosive paint and preparation method thereof |
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| Title |
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| 于晓辉等: "鳞片状锌基环氧富锌重防腐涂料的研制" * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116554760A (en) * | 2023-06-19 | 2023-08-08 | 安徽棠凝新材料科技有限公司 | Water-based epoxy heavy-duty anticorrosive paint and preparation method thereof |
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Application publication date: 20221021 |