CN113185894A - Toughening type steel bar anticorrosion powder coating and preparation method thereof - Google Patents
Toughening type steel bar anticorrosion powder coating and preparation method thereof Download PDFInfo
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- 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
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- 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
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Abstract
The invention relates to a toughened steel bar anticorrosion powder coating and a preparation method thereof. The powder coating is prepared from the following components: 60 parts of base powder, 1-5 parts of glass flakes, 0.2-1 part of bonding auxiliary agent and 0.1-0.3 part of bulking agent. The base powder comprises the following components in percentage by weight: 60-85% of resin, curing agent and toughening curing agent, 0.5-2% of curing accelerator, 0.7-1.5% of flatting agent, 0.2-1.5% of defoaming agent, 5-20% of filler, 0.5-5% of pigment and 0.2-1.5% of coupling agent. The invention also provides a preparation method of the toughened steel bar anticorrosive powder coating. The coating formed by the toughened steel bar anticorrosion powder coating has excellent anticorrosion performance and low-temperature flexibility, and is particularly suitable for protecting concrete steel bars in severe environments.
Description
Technical Field
The invention belongs to the field of powder coatings, and particularly relates to a toughened anticorrosion powder coating for steel bars and a preparation method thereof.
Background
The powder paint is a green environment-friendly paint which is developed rapidly in recent years and does not contain solvent, and is a solid powder paint composed of solid resin, pigment, filler, auxiliary agent and the like, and is heated and baked after being subjected to electrostatic spraying or fluidized bed dip coating at normal temperature, and is cured into a flat and hard coating after being subjected to chemical crosslinking.
Concrete reinforcement structures have been widely used in modern building engineering, concrete is a porous gel, oxygen, moisture and other corrosive media in the air can corrode the reinforcement through pores and fine cracks, the mechanical properties of the reinforcement are reduced, and the volume of the reinforcement is expanded by dozens of times when the reinforcement becomes rust, so that the concrete cracks and a protective layer peels off, the service life of the reinforced concrete building is further shortened, and even serious catastrophic accidents are caused. Before the reinforcing steel bar in the reinforced concrete structure is used, a layer of powder coating is sprayed to delay the corrosion of the reinforcing steel bar and prolong the service life of the concrete, which proves that the powder coating is the best means for protecting the reinforced concrete at present.
The existing anticorrosive powder coating for the steel bars is mainly epoxy resin, phenolic resin, acid anhydride and the like are used as curing agents, imidazole is used as a catalyst to form a film forming system, the cross-linked structure of the system after curing is compact, the corrosion resistance effect is good, but the defects of brittleness and insufficient toughness exist, so that the film is easy to crack when being bent and formed (especially at low temperature), and the corrosion resistance effect is influenced; in addition, because of the limit of the manufacturing process, the fillers adopted in the formula are all spherical, the microscopic defects of the filler coating (pinholes formed in the curing process of the coating, pores in the structure and cavities generated by molecular vibration) are many, and corrosive media tend to penetrate linearly in the defects, so that the corrosive media can easily reach the surface of the steel bar to cause corrosion, and the corrosion prevention effect is influenced; the two defects can cause the existing concrete reinforcing steel bars to be easily corroded and the service life of the concrete reinforcing steel bars to be influenced in facilities and environments such as coastal ports and docks, sea-crossing bridges, airports and expressways which need to be sprinkled with salt water for freeze-proofing and thawing.
In recent years, the 'maze' barrier effect of sheet fillers such as glass flakes and the like is utilized to improve the permeability resistance and the corrosion resistance of an organic coating, and the method becomes a research trend in the field of domestic and foreign anticorrosive coatings. The glass flakes have the characteristics of simple manufacture, low cost, stable chemical property and the like, are generally used in oil paint, but the glass flakes are difficult to maintain the original flaky shape in the traditional processing and crushing process of powder coating, so that the application of the glass flakes in the powder coating is limited; if the glass flakes are directly added into the base powder (dry mixing method), the glass flakes and the base powder are fully mixed and dispersed by using high-speed mixing equipment to form a finished product, because the physical properties (such as density, shape, dielectric constant and resistance) of the glass flakes and the base powder are greatly different and the glass flakes and the base powder are not adhered and adsorbed, the glass flakes and the base powder are separated in the electrostatic spraying process, the solidified coating components are not uniform, the faults of gun blockage and the like can occur, the quality of the powder coating is influenced, and the shielding, permeation resistance and corrosion resistance of the glass flakes can not be exerted.
The following patent documents relevant to the present application are retrieved, and CN 103509431 a (201310376267.6) is a pure epoxy heavy-duty anticorrosion powder coating for coating construction steel bars, which is prepared from the following raw materials in parts by weight: 200 parts of epoxy resin, 10-50 parts of epoxy curing agent, 0-3 parts of curing accelerator, 0-100 parts of inorganic filler, 2-10 parts of assistant and 0-10 parts of pigment. In order to improve the flexibility of a coating formed by the steel bar anticorrosion powder coating, the invention adopts the epoxy curing agent as an anhydride epoxy curing agent and a modifier thereof. The structure of the curing agent in an epoxy resin system is a key factor for determining the performance of the curing agent, most of anhydride curing agents contain rigid benzene ring structures, lack flexible chain segments, have strong network rigidity after curing, have defects compared with the invention in low-temperature toughness, can pass a bending test in a laboratory test environment with the standard requirement temperature of 25 ℃, but when the environmental temperature is lower than 10 ℃, the coating is easy to crack when a steel bar is bent. In addition, most anhydride curing agents have pungent odor and corrosiveness, are harmful to eyes, skin and respiratory tract and are inconvenient to use. Document CN101531857 (ZL 200910031029.5) also discloses an epoxy resin powder coating, which can be used for steel bar protection, and the coating is prepared from the following raw materials in parts by weight: 650 to 750 portions of rubber epoxy resin, 150 to 250 portions of phenolic aldehyde curing agent, 60 to 100 portions of titanium dioxide and 5 to 10 portions of pigment, but the invention adopts the phenolic aldehyde curing agent, and because the functionality is higher and the rigidity of a molecular chain is stronger, the invention does not use toughened epoxy resin, and has the defect of insufficient low-temperature toughness. The inorganic fillers adopted in the formulas of the two patent documents are changed into spherical fillers in the crushing process, and the anti-permeability is poor, so that the anti-corrosion effect is slightly insufficient.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a toughening type steel bar anticorrosion powder coating and a preparation method thereof, and solves the problems that the steel bar powder coating in the prior art is poor in low-temperature toughness and easy to corrode.
The invention is realized by the following technical scheme: the toughened steel bar anticorrosive powder coating is characterized by comprising the following components in parts by weight: the composition is prepared from the following components in parts by weight:
60 parts of base powder, 1-5 parts of glass flakes, 0.2-1 part of bonding auxiliary agent and 0.1-0.3 part of loosening agent;
the base powder comprises the following components in percentage by weight: 60-85% of resin, curing agent and toughening curing agent, 0.5-2% of curing accelerator, 0.7-1.5% of flatting agent, 0.2-1.5% of defoaming agent, 5-20% of filler, 0.5-5% of pigment and 0.2-1.5% of coupling agent;
the glass flake is flaky glass with better chemical corrosion resistance, has the thickness of 2-5 mu m and the particle size of 10-40 mu m, and is prepared by melting C-type medium-alkali glass with the temperature of more than 1200 ℃ through the processes of bubbling, cooling, crushing, screening and grinding.
The added flaky structure glass flakes are arranged in parallel in the coating film, so that micropores in the coating film are cut off, a high-efficiency barrier effect can be formed in the coating film, corrosive substances are diffused, permeated and migrated in the coating film to become extremely circuitous and tortuous (shielding and labyrinth effects), the diffusion path of the corrosive medium in the coating film is greatly prolonged, the corrosion of the corrosive medium to the steel bar is delayed, and the corrosion resistance of the steel bar powder coating is greatly improved.
The preparation method of the toughened steel bar anticorrosive powder coating comprises the following steps:
(1) preparing base powder:
a. sequentially adding resin, curing agent, toughening curing agent, curing accelerator, flatting agent, defoaming agent, filler, pigment and coupling agent into a mixer, mixing and stirring uniformly, and controlling the time for 2-4min;
b. delivering the mixed materials to an extruder through a feeder for melt mixing and dispersion extrusion, wherein the temperature of the extruder is controlled to be 100-105 ℃ in the area I and 85-90 ℃ in the area II;
c. the extruded materials are melted, mixed, pressed into flaky materials which are easy to crush by tabletting, cooling and rolling, and crushed into flaky materials by a crusher;
d. feeding the small-sized materials to an ACM (activated carbon model) mill through a material conveyor, finely crushing, and passing through a 150-mesh screen to prepare base powder;
(2) bonding glass flakes: adding the base powder into a bonding kettle with a stirring blade coated with a silicone rubber sleeve with the thickness of 5 mm, adding a bonding wax powder auxiliary agent, stirring and heating; when the preset temperature in the bonding kettle reaches 56-58 ℃, adding the glass flakes, and bonding for 3-8 minutes;
(3) and (3) rapidly conveying the bonded powder into a cooling tank, cooling to 25 ℃, adding a loosening agent, stirring for 2-5 minutes, and finally sieving by a 80-mesh sieve to obtain a finished product.
The resin is epoxy resin; the curing agent is phenolic hydroxyl resin; the toughening curing agent is one or two of aromatic polyurethane prepolymer and aliphatic polyurethane prepolymer; in the film-forming resin, polyurethane, epoxy resin and phenolic hydroxyl resin form interpenetrating network polymer, which can play the role of forced inclusion and synergistic effect, when the coating film is subjected to external stress (such as stretching, impact and the like), the interpenetrating network polymer particles generate plastic deformation and deflection and branching of microcracks, so that the energy consumption of the coating film crosslinked network is generated, and the toughness of the coating film is obviously improved. By the accurate proportion of the epoxy resin, the phenolic hydroxyl resin curing agent and the toughened polyurethane curing agent, the corrosion resistance and the mechanical property of the epoxy resin are kept, and the defects of brittleness and insufficient toughness of cured products of the epoxy resin are overcome, so that cracks are avoided when a coating film is bent and formed at a low temperature, and the corrosion resistance of the reinforcing steel bar powder coating is improved.
The curing accelerator is any one or more of undecylimidazole, heptadecylimidazole or alkylimidazole derivatives. Compared with common imidazole which is used for promoting the curing of the epoxy powder coating, the coating has good flexibility.
The bonding auxiliary agent is any one or more of polyethylene wax powder, polytetrafluoroethylene wax powder, polypropylene micro-powder wax and fluorine modified polyethylene wax powder, and the average particle size of the bonding auxiliary agent is 1-5 mu m. The adhesive has the advantages that the adhesive plays a role in dispersing and blocking the base powder particles, prevents the adhesion and caking in the bonding process, obviously improves the adhesive property of the glass flakes and the base powder particles, reduces the defects of mistaken bonding, pre-curing and the like, and improves the bonding efficiency.
The loosening agent is one or two of alumina C and fumed silica, and has a specific surface area of 200m2(ii) in terms of/g. The loosening agent plays a role in loosening, reduces affinity and cohesion among powder coating particles, improves dry powder fluidity of the powder coating and vulcanization performance of a powder supply tank, and improves powder feeding rate.
The leveling agent is one or two of acrylic acid-vinegar copolymer and polyether; the leveling agent plays a role in wetting and leveling by reducing the surface tension of the system, so that the coating has a good leveling effect, and a smooth, flat and uniform coating film is formed.
The defoaming agent is any one or more of benzoin, degassed wax powder, defoaming wax powder, polyethylene wax powder and polypropylene composite micro-powder wax. The defoaming agent has the functions of reducing or eliminating bubbles, can quickly remove the bubbles from the coating in the curing process, ensures the compactness of the coating, prevents the coating from generating micro defects such as pinholes, reduces corrosion channels and ensures the smooth and bright appearance of the coating.
The filler is one or more of titanium dioxide, precipitated sulfuric acid dam, talcum powder, light calcium carbonate and silica powder, the average particle size of the filler is 1000-3000 meshes, the optimization of the particle size of the filler can increase the dispersion uniformity of the filler in resin, and the physical and mechanical properties of the coating are enhanced. The pigment is added according to the color required by the customer.
The coupling agent is any one or two of siloxane coupling agent and titanate coupling agent. The coupling agent can increase the binding force between the resin and the filler, and enhance and improve the physical and mechanical properties of the coating. In addition, the chemical bond of the coupling agent can generate affinity action with the substrate and the concrete, and the microscopic structure of the interface layer can be obviously improved, so that the bonding performance of the substrate, the coating and the concrete is greatly improved.
The invention has the beneficial effects that:
1. the polyurethane prepolymer with excellent low-temperature toughness and the long-chain type series imidazole derivatives are added into a film forming system, so that the toughness of the film is improved, the change of stress of the steel bar during low-temperature bending can be borne by the film, and cracks easily generated in the film when the steel bar is bent and formed at low temperature are effectively avoided. The rejection rate of the steel bar bending process is reduced, and the production efficiency and the economic benefit are improved.
2. The glass flakes with a flaky structure are introduced into the powder coating by using a thermal bonding technology, and the fish scale effect formed by a plurality of layers of glass flakes which are arranged approximately parallel to the base material can prolong the penetration distance of a corrosive medium by multiple times or even tens of times, so that the corrosive medium is difficult to penetrate into the base material, and the corrosion resistance of the steel bar powder coating is greatly improved; the glass flakes can reduce the expansion coefficient and the hardening shrinkage of the whole coating, thereby improving the adhesion of the coating and a base material and preventing the occurrence of cracks and peeling-off phenomena; the glass flakes have good mechanical properties and are tightly bonded with resin, so that the wear resistance and impact resistance of the coating film are greatly improved.
3. The coupling agent makes the resin and the filler in the system adhere tightly, not only improves the physical and mechanical properties of the coating, but also improves the relative adhesive strength of the reinforcing steel bar and the concrete.
4. The stirring blade of the bonding kettle is coated with the silicon rubber sleeve with the thickness of 5 mm, so that the damage of the stirring blade to the glass flakes can be greatly reduced, the sheet structure of the glass flakes is protected to the maximum extent, the physical shielding effect of the sheet structure can be thoroughly exerted, and the corrosion resistance of the reinforcing steel bar powder coating is enhanced.
5. The adopted raw materials are easy to obtain, the preparation method is simple, the production process has no pollution to the environment, and industrialization is easy to realize. The coating is suitable for the corrosion prevention of the steel bars in a reinforced concrete structure in a humid environment or a corrosive medium, and can delay the corrosion of the steel bars of the substrate, thereby prolonging the service life of the building.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
Example 1:
a toughened steel bar anticorrosion powder coating comprises: the method is characterized in that: the composition is prepared from the following components in parts by weight:
60 kg of base powder, 0.5 kg of bonding auxiliary agent polyethylene wax powder, 0.15 kg of bulking agent alumina C and 2 kg of glass flakes.
The base powder comprises the following components in parts by weight: 35 kg of E-12 epoxy resin, 5.90 kg of curing agent phenolic hydroxyl resin, 15304.70 kg of toughening curing agent polyurethane, 11Z 0.66.66 kg of curing accelerator Curezol C11, 2880.53 kg of leveling agent GLP, 0.60 kg of defoamer benzoin, 7.76 kg of filler precipitated barium sulfate, 0.42 kg of filler talcum powder, 3.32 kg of titanium dioxide, 0.42 kg of pigment phthalocyanine blue and 0.52 kg of coupling agent W-66700.69.
Phenolic hydroxyl resin (self-made), hydroxyl value 0.5 mol/100 g. The average particle diameter of the base powder is 20-45 μm.
The preparation method comprises the following steps:
(1) preparing base powder:
a. sequentially adding the components of the base powder into a mixer, and uniformly mixing and stirring for 3min;
b. delivering the mixed materials to an extruder through a feeder for melt mixing and dispersion extrusion, wherein the temperature of the extruder is controlled to be 100-105 ℃ in the area I and 85-90 ℃ in the area II;
c, melting, mixing and extruding the materials, tabletting, cooling, rolling into flaky easily-crushed materials, and crushing into flaky materials by a crusher;
d. and (3) feeding the small-sized materials to an ACM (Acetobacter xylinum) mill through a material conveyor, finely crushing, and passing through a 150-mesh screen to obtain base powder.
(2) Bonding glass flakes: adding the base powder into a bonding kettle with a stirring blade coated with a silicone rubber sleeve with the thickness of 5 mm, adding a bonding wax powder auxiliary agent, stirring and heating; when the temperature in the bonding kettle reaches 57 ℃, adding the glass flakes, and bonding for 3-8 minutes.
(3) And (3) rapidly conveying the bonded powder into a cooling tank, cooling to 25 ℃, adding a loosening agent, stirring for 2-5 minutes at the stirring speed of 2-5 revolutions per second, and finally sieving by a 80-mesh sieve to obtain a finished product.
The coating detection method comprises the following steps:
the steel bar powder coating obtained in the embodiment is subjected to main performance inspection, the diameter of the threaded steel bar is phi 18 mm, the threaded steel bar is treated according to the JG/T502-2016 standard requirement, then the temperature is preheated to 230-. Then tested according to JG/T502-2016.
The material of the shock resistance is a sand blasting steel plate, and the size is 100 multiplied by 5 mm; the wear resistance is realized, the aluminum plate is made of materials, and the size is 100 mm; the steel plate and the aluminum plate were treated according to the regulations of GB/T9271.
And in addition, the existing commercially available epoxy steel bar powder coating, namely the first comparison sample and the epoxy phenolic resin steel bar powder coating, namely the second comparison sample, which are both spherical fillers, are cured to form a film according to the method, and the same performance test is respectively carried out. The test results are shown in Table 1.
Example 2:
a toughened steel bar anticorrosion powder coating comprises: the method is characterized in that: the composition is prepared from the following components in parts by weight:
60 kg of base powder, 0.4 kg of bonding assistant fluorine modified polyethylene wax powder, 0.1 kg of bulking agent fumed silica and 2.3 kg of glass flakes.
The base powder comprises the following components in parts by weight: 35 kg of E-12 epoxy resin, 5.36 kg of curing agent phenolic hydroxyl resin, 13204.96 kg of toughening curing agent polyurethane, 17Z 0.57.57 kg of curing accelerator Curezol C17, 0.57 kg of leveling agent GLP 2880.58, 0.50 kg of defoamer polyethylene wax powder, 7.1 kg of filler precipitated barium sulfate, 1.62 kg of filler light calcium carbonate, 3.24 kg of titanium dioxide, 0.49 kg of pigment carbon black and a coupling agent ND-7820.58.
Phenolic hydroxyl resin (self-made), the hydroxyl value is 0.5 mol/100g, and the average particle size of the base powder is 20-45 mu m.
The preparation method and the coating film detection method are the same as those of example 1. The test results are shown in Table 1.
Example 3:
a toughened steel bar anticorrosion powder coating comprises: the method is characterized in that: the composition is prepared from the following components in parts by weight:
60 kg of base powder, 0.5 kg of bonding auxiliary agent polytetrafluoroethylene wax powder, 0.15 kg of bulking agent alumina C and 2.7 kg of glass flakes.
The base powder comprises the following components in parts by weight: 35 kg of E-12 epoxy resin, 5.73 kg of curing agent phenolic hydroxyl resin, 14285.31 kg of toughening curing agent polyurethane Additol, 11Z 0.62.62 kg of curing accelerator Curezol C11, 2880.66 kg of leveling agent GLP, 0.54 kg of defoamer polypropylene composite micro-powder wax, 6.79 kg of filler precipitated barium sulfate, 0.83 kg of filler silicon micro-powder, 3.32 kg of filler titanium dioxide, 0.50 kg of pigment phthalocyanine green and 0.6352 kg of coupling agent ND-7830.70.
Phenolic hydroxyl resin (self-made), the hydroxyl value is 0.5 mol/100g, and the average particle size of the base powder is 20-45 mu m.
The preparation method and the coating film detection method are the same as those of example 1. The test results are shown in Table 1.
As shown in Table 1, the coating film formed by the toughened anticorrosion powder coating for reinforcing steel bars prepared by the invention meets the requirement index of JG/T502-2016 in terms of both physical and mechanical properties and chemical corrosion resistance. Compared with the comparative example, the flexibility, the chemical corrosion resistance, the chloride resistance, the cathodic disbonding resistance and the like of the coating are greatly improved.
The detection result shows that the toughened anticorrosion powder coating for the steel bar can meet various performance requirements of the epoxy coating steel bar for the current domestic construction, is particularly suitable for a reinforced concrete structure in a humid environment or a corrosive medium, delays the corrosion of the base steel bar, prolongs the service life of the building, and has great practical value and wide market prospect.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way, and it should be understood that those skilled in the art can make appropriate changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications should be considered as within the scope of the present invention.
Claims (9)
1. The toughened steel bar anticorrosive powder coating is characterized by comprising the following components in parts by weight: the composition is prepared from the following components in parts by weight:
60 parts of base powder, 1-5 parts of glass flakes, 0.2-1 part of bonding auxiliary agent and 0.1-0.3 part of loosening agent;
the base powder comprises the following components in percentage by weight: 60-85% of resin, curing agent and toughening curing agent, 0.5-2% of curing accelerator, 0.7-1.5% of flatting agent, 0.2-1.5% of defoaming agent, 5-20% of filler, 0.5-5% of pigment and 0.2-1.5% of coupling agent;
the thickness of the glass flake is 2-5 μm, the particle size is 10-40 μm, and the glass flake is prepared by melting C type medium alkali glass with the temperature of more than 1200 ℃ through the processes of bubbling, cooling, crushing, screening and grinding.
2. The preparation method of the toughened type steel bar anticorrosive powder coating as claimed in claim 1, characterized by comprising the following steps:
(1) preparing base powder:
a. sequentially adding resin, curing agent, toughening curing agent, curing accelerator, flatting agent, defoaming agent, filler, pigment and coupling agent into a mixer, mixing and stirring uniformly, and controlling the time for 2-4min;
b. delivering the mixed materials to an extruder through a feeder for melt mixing and dispersion extrusion, wherein the temperature of the extruder is controlled to be 100-105 ℃ in the area I and 85-90 ℃ in the area II;
c. the extruded materials are melted, mixed, pressed into flaky materials which are easy to crush by tabletting, cooling and rolling, and crushed into flaky materials by a crusher;
d. feeding the small-sized materials to an ACM (activated carbon model) mill through a material conveyor, finely crushing, and passing through a 150-mesh screen to prepare base powder;
(2) bonding glass flakes: adding the base powder into a bonding kettle, adding a bonding wax powder auxiliary agent, stirring and heating; when the preset temperature in the bonding kettle reaches 56-58 ℃, adding the glass flakes, and bonding for 3-8 minutes;
(3) and (3) rapidly conveying the bonded powder into a cooling tank, cooling to 25 ℃, adding a loosening agent, stirring for 2-5 minutes, and finally sieving by a 80-mesh sieve to obtain a finished product.
3. The toughened type steel bar anticorrosive powder coating as claimed in claim 1, wherein: the bonding auxiliary agent is any one or more of polyethylene wax powder, polytetrafluoroethylene wax powder, polypropylene micro-powder wax and fluorine modified polyethylene wax powder, and the average particle size of the bonding auxiliary agent is 1-5 mu m.
4. The toughened type steel bar anticorrosive powder coating as claimed in claim 1, wherein: the loosening agent is one or two of alumina C and fumed silica, and has a specific surface area of 200m2/g。
5. The toughened type steel bar anticorrosive powder coating as claimed in claim 1, wherein: the resin is epoxy resin; the curing agent is phenolic hydroxyl resin; the toughening curing agent is one or two of aromatic polyurethane curing agent and aliphatic polyurethane curing agent; the curing accelerator is any one or more of undecylimidazole, heptadecylimidazole or alkylimidazole derivatives.
6. The toughened type steel bar anticorrosive powder coating as claimed in claim 1, wherein: the leveling agent is one or two of acrylic acid-vinegar copolymer and polyether; the defoaming agent is any one or more of benzoin, degassed wax powder, defoaming wax powder, polyethylene wax powder and polypropylene composite micro-powder wax.
7. The toughened type steel bar anticorrosive powder coating as claimed in claim 1, wherein: the filler is one or more of titanium dioxide, precipitated sulfuric acid dam, talcum powder, light calcium carbonate and silica powder, and the average particle size of the filler is 1000-3000 meshes.
8. The toughened type steel bar anticorrosive powder coating as claimed in claim 1, wherein: the coupling agent is any one or two of siloxane coupling agent and titanate coupling agent.
9. The preparation method of the toughened type steel bar anticorrosive powder coating as claimed in claim 2, wherein the preparation method comprises the following steps: the stirring blade of the bonding kettle is coated with an elastic material with the thickness of 5 mm.
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Application publication date: 20210730 |