CN114672795B - Water-based rust conversion agent, water-based rust conversion coating and preparation method thereof - Google Patents
Water-based rust conversion agent, water-based rust conversion coating and preparation method thereof Download PDFInfo
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 148
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- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims abstract description 50
- 235000013824 polyphenols Nutrition 0.000 claims abstract description 44
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
-
- 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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
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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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/324—Alkali metal phosphate
-
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a water-based rust conversion agent, a water-based rust conversion coating and a preparation method thereof, and relates to the technical field of rust treatment. An aqueous rust conversion agent comprising tea polyphenols and gallic acid; the mass ratio of the tea polyphenol to the gallic acid is 2-7:4-10. The aqueous rust conversion agent also comprises a conversion auxiliary agent; the conversion aid comprises at least one of sodium tripolyphosphate, sodium aminomethylene phosphonate or triethanolamine phosphate. An aqueous rust conversion coating comprises the aqueous rust conversion agent, nano modified acrylic resin, nano fumed silica and optional additives. The aqueous rust conversion coating provided by the invention can generate more stable chelate through reaction with rust, and prevent the rust from continuing to develop, thus achieving the dual purposes of rust removal and protection. The preparation method provided by the invention has the advantages of mild preparation conditions and high production efficiency, effectively saves manpower and material resources, and is suitable for large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of rust treatment, in particular to a water-based rust conversion agent, a water-based rust conversion coating and a preparation method thereof.
Background
When the steel base material is coated, the rust coating can be directly applied on the rust surface of the steel, and the rust conversion coating converts a rust layer attached to the surface of the iron base body more tightly into a compound with higher resistance, particularly oxidation resistance, and forms a compound or a mixture of compounds with protective barrier against an erosion source. The rust coating improves the labor condition and improves the work efficiency.
The currently used rust conversion coating mainly has the following defects:
(1) the rust transfer capability is limited;
(2) unstable and liable to brown stain.
In view of this, the present invention has been made.
Disclosure of Invention
The first aim of the invention is to provide an aqueous rust conversion agent, which aims to solve the problems of insufficient rust conversion capability and poor stability of the existing rust conversion coating.
The second object of the present invention is to provide an aqueous rust conversion coating which does not use an organic solvent or a heavy metal rust inhibitive pigment and has the characteristics of high rust inhibitive performance, high adhesion and low VOC.
The third object of the invention is to provide the preparation method of the water-based rust conversion coating, which is simple in preparation steps, high in production efficiency and suitable for large-scale industrial production.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect the invention provides an aqueous rust converting agent comprising tea polyphenols and gallic acid;
the mass ratio of the tea polyphenol to the gallic acid is 2-7:4-10.
Further, the method also comprises a conversion auxiliary agent; the conversion auxiliary agent comprises at least one of sodium tripolyphosphate, sodium aminomethylene phosphonate or triethanolamine phosphate;
preferably, the mass ratio of the sodium tripolyphosphate to the tea polyphenol is 3-8:2-7;
preferably, the mass ratio of the sodium aminomethylene phosphonate to the tea polyphenol is 1-3:2-7;
preferably, the mass ratio of the triethanolamine phosphate to the tea polyphenol is 2-5:2-7.
Further, the paint comprises the following components in percentage by mass: 2-7% of tea polyphenol, 4-10% of gallic acid, 3-8% of sodium tripolyphosphate, 1-3% of sodium aminomethylene phosphonate, 2-5% of triethanolamine phosphate, 8-13% of optional auxiliary agent and the balance of water;
preferably, the auxiliary agent comprises a nonionic emulsifier.
In a second aspect, the invention provides an aqueous rust conversion coating comprising component A and component B; the component A is the aqueous rust conversion agent in the first aspect;
the component B comprises nano modified acrylic resin.
Further, the component B also includes nano fumed silica and optional additives.
Preferably, the additive includes at least one of a leveling agent, a dispersing agent, an antifoaming agent, or a thickener.
Further, the component B comprises the following components in percentage by mass: 60-70% of the nano modified acrylic resin, 5-10% of the nano fumed silica, and optionally 0.1-3.4% of the additive, and the balance being water.
Further, the component B comprises the following components in percentage by mass: 5-10% of nano fumed silica, 60-70% of nano modified acrylic resin, 0.4-0.8% of leveling agent, 0.1-0.5% of dispersing agent, 0.2-0.6% of defoaming agent or 0.8-1.5% of thickening agent, and the balance of water.
Further, the mass ratio of the component A to the component B is 1:6-8.
The third aspect of the invention provides a preparation method of the water-based rust conversion coating, which is characterized in that the component A and the component B are uniformly mixed to obtain the water-based rust conversion coating.
Further, the preparation method of the component A comprises the steps of uniformly mixing the tea polyphenol, the gallic acid, the optional conversion auxiliary agent, the optional auxiliary agent and water to obtain the component A;
preferably, the preparation method of the component B comprises the steps of uniformly mixing the nano modified acrylic resin, the nano fumed silica and the optional additive to obtain the component B;
preferably, the means of mixing comprises stirring;
preferably, the stirring speed is 350-450r/min.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides tea polyphenol, gallic acid and Fe in rust in the rust conversion agent 2+ 、Fe 3+ Chelation occurs to form stable and indissolvable chelates attached to the metal surfaceThe rust is converted into stable substances, and the rust is prevented from further developing, so that the aim of rust prevention is fulfilled. The rust conversion agent provided by the invention shortens the rust conversion time and has excellent rust conversion capability.
2. The water-based rust conversion coating provided by the invention can stabilize, passivate and convert rust, and change active rust into harmless substances, thereby achieving the dual purposes of rust removal and protection. The aqueous rust conversion coating improves the activity of the curing reaction through phenolic hydroxyl introduced by tea polyphenol and gallic acid, and shortens the curing reaction time; in addition, in the curing process of the water-based rust conversion coating, the phenolic hydroxyl group also improves the adhesive force of the coating.
3. The preparation method of the water-based rust conversion coating provided by the invention has the advantages of simple process, convenience in operation and strong process controllability, and is suitable for large-scale industrial production.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. Thus, the detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The steel base material can be corroded under natural conditions due to the characteristics of the steel base material, so that the appearance of the steel base material is affected, and serious potential safety hazards are caused. The coating is to cover a protective layer or a decorative layer on the surface of steel to isolate the steel product from water and oxygen and prevent the steel from being corroded. Before the steel substrate is coated, the surface rust removal treatment must be strictly performed. The existing rust removal treatment mainly comprises two modes of mechanical rust removal and chemical rust removal, and has complex working procedures and environmental damage. In particular to a built steel base material building, only a manual rust removal mode can be adopted, the rust removal effect is difficult to meet the requirement, and the subsequent coating effect cannot be expected.
The rust coating is one way to solve the problems, and the rust conversion coating is used during coating, so that the rust coating can play a role in stabilizing or converting floating rust, and has good construction property and environmental friendliness.
According to a first aspect of the present invention there is provided an aqueous rust converting agent comprising tea polyphenols and gallic acid;
the mass ratio of the tea polyphenol to the gallic acid is 2-7:4-10.
The tea polyphenol and gallic acid in the aqueous rust conversion agent provided by the invention provide a large amount of phenolic hydroxyl groups, and can well and effectively react with Fe 2+ 、Fe 3+ Chelating to form stable indissoluble chelate attached to the metal surface; the synergistic effect of sodium tripolyphosphate, sodium aminomethylene phosphonate, triethanolamine phosphate, tea polyphenols and gallic acid prevents the formation of rust, and chelating coordination is carried out with the formed rust to convert the rust into stable substances and prevent the rust from further developing. The water-based rust conversion agent provided by the invention shortens the rust conversion time and has excellent rust conversion capability.
Phenolic hydroxyl group and Fe 3+ The chelation reaction formula is shown as the following formula (1);
phenolic hydroxyl group and Fe 2+ The chelation reaction formula is shown in the following formula (2).
Tea polyphenols are a mixture of polyhydroxy phenols and their derivatives extracted from natural plant tea leaves. It has strong oxidation resistance and physiological activity, and can inhibit oxidation reaction of metal surface. Tea polyphenol is also a natural metal ion chelating agent, and can chelate and precipitate heavy metal ions to generate stable and indissoluble chelate which is attached to the metal surface. The tea polyphenol has a molecular structure containing a plurality of phenolic hydroxyl groups, so that the tea polyphenol has strong hydrophilicity and is easy to dissolve in water.
Gallic acid has good permeability and oxidation resistance, deep conversion is carried out on rust in the aqueous rust conversion agent, and the generated conversion film has good compactness. The conversion film forms a protective film on the base material and fixes the chelate after conversion, so that the compactness and corrosion resistance of the aqueous rust conversion agent are enhanced.
In some preferred embodiments of the invention, the mass ratio of tea polyphenols to gallic acid is typically, but not limited to, 1:2,2:7,1:5,7:4,7:10,1:1 or 2:5.
further, the method also comprises a conversion auxiliary agent; the conversion auxiliary agent comprises at least one of sodium tripolyphosphate, sodium aminomethylene phosphonate or triethanolamine phosphate;
preferably, the mass ratio of the sodium tripolyphosphate to the tea polyphenol is 3-8:2-7;
preferably, the mass ratio of the sodium aminomethylene phosphonate to the tea polyphenol is 1-3:2-7;
preferably, the mass ratio of the triethanolamine phosphate to the tea polyphenol is 2-5:2-7.
Sodium tripolyphosphate is white powder, is easy to dissolve in water, has remarkable chelating ability for metal ions, and eliminates further corrosion of the metal ions on the surface of steel by sealing the metal ions.
The sodium amino methylene phosphonate can be mutually dissolved with water, can form stable chelate with metal ions of iron, has good dispersion performance, also has corrosion inhibition effect, and delays the corrosion effect of the metal surface.
The triethanolamine phosphate has a corrosion inhibition effect on the oxidation process of steel, and the action principle is that the electron pair of the center atom of the triethanolamine phosphate forms a coordinate bond with metal and has an adsorption effect. Adsorption proceeds slowly but is difficult to desorb once adsorbed. The iron ions receive the chemical adsorption of triethanolamine phosphate molecules, and the iron ions adsorb PO in the solution 4 3- ，PO 4 3- With Fe 3+ Production of FePO 4 Form a mixture of triethanolamine phosphate and Fe 2 O 3 、Fe 3 O 4 、FePO 4 The formed multiple protective film plays a good role in protecting the surface of carbon steel, and the corrosion speed is greatly reduced.
In some preferred embodiments of the invention, the mass ratio of sodium tripolyphosphate to tea polyphenol is typically, but not limited to, 3:2,4:1,5:2,3:7,8:7,5:7,3:4,2:1 or 5:4, a step of; the mass ratio of sodium aminomethylene phosphonate to tea polyphenol is typically, but not limited to, 1:2,3:2,1:7,3:7,1:4 or 3:4, a step of; the ratio of amounts of triethanolamine phosphate to tea polyphenols is typically, but not limited to, 1:1,5:3,2:7,5:7,2:5,1:1 or 4:5.
further, the paint comprises the following components in percentage by mass: 2-7% of tea polyphenol, 4-10% of gallic acid, 3-8% of sodium tripolyphosphate, 1-3% of sodium aminomethylene phosphonate, 2-5% of triethanolamine phosphate, 8-13% of optional auxiliary agent and the balance of water;
preferably, the auxiliary agent comprises a nonionic emulsifier.
Nonionic emulsifiers are surfactants that do not generate ions in aqueous solutions. In the rust conversion process, hydroxyl and metal ions are utilized to react, and the nonionic emulsifier is selected to not interfere the rust conversion process and also play a role in emulsification.
In some preferred embodiments of the invention, the tea polyphenols are typically, but not limited to, 2%,5% or 7% by mass; gallic acid is typically, but not limited to, 4%,7% or 10% by mass; sodium tripolyphosphate is typically but not limited to 3%,5% or 8% by mass; sodium aminomethylene phosphonate is typically, but not limited to, 1%,2% or 3% by mass; triethanolamine phosphate is typically, but not limited to, 2%,4% or 5% by mass; the nonionic emulsifier is typically, but not limited to, 8%,10% or 13% by mass.
In a preferred embodiment of the invention, the water is deionized water.
According to a second aspect of the present invention there is provided an aqueous rust conversion coating comprising component a and component B;
the component A is the aqueous rust conversion agent in the first aspect;
the component B comprises nano modified acrylic resin.
The raw material of the water-based rust conversion coating provided by the invention contains more reactive groups, and the reactive groups can be better combined with nano modified acrylic resin containing carboxyl and hydroxyl and are easier to attach to a steel substrate, so that the water-based rust conversion coating provided by the invention has strong adhesive force, effectively blocks penetration and diffusion of external environment impurities, corrosive substances and the like to the steel substrate, and forms a compact protective layer. The protective layer has the characteristics of good anti-corrosion effect, low coating thickness, high adhesive force, light weight, good mechanical property, excellent salt spray resistance, long service life, low cost and the like.
The nano modified acrylic resin has excellent high-temperature stability and oxidation degradation resistance. The nanometer modified acrylic resin not only can improve the adhesive force of a coating film, but also can greatly improve various resistances of the resin due to the fact that nanometer materials are condensed into a space network structure in the drying film forming process. When the nano material is applied to acrylic resin modification, the physical and mechanical properties of a paint film can be obviously improved.
Further, the component B also includes nano fumed silica and optional additives.
Preferably, the additive includes at least one of a leveling agent, a dispersing agent, an antifoaming agent, or a thickener.
The nanometer fumed silica is white fluffy powder, and has the characteristics of porosity, no toxicity, no smell, no pollution and high temperature resistance. The anti-thixotropic and thickening effects are achieved in the aqueous rust conversion coating, the precipitation and sagging of the coating can be prevented, and the viscosity index of the coating can be changed. The nano fumed silica improves the corrosion resistance of the coating of the water-based rust conversion coating, improves the scratch resistance and the physical and mechanical properties of a paint film, and can improve the adhesive force and the flexibility of the paint film.
The leveling agent promotes the water-based rust conversion coating to form a flat, smooth and even coating film in the drying and film forming process. The leveling agent can reduce the surface tension of the coating liquid, improve the leveling property and uniformity of the coating liquid, improve the permeability of the water-based rust conversion coating, reduce spots and marks generated by brushing, increase the coverage and make the film forming uniform and natural.
The dispersant reduces the time and energy required for the dispersion process of the aqueous rust conversion coating. The dispersing agent can also improve the luster of the water-based rust conversion coating, increase the leveling effect and prevent flooding and bloom. The dispersing agent can also reduce the viscosity of the aqueous rust conversion coating, increase the pigment loading, reduce flocculation and increase the storage stability and color development.
The defoamer can reduce the surface tension of the aqueous rust conversion coating and prevent foam formation in the stirring and mixing process. The thickening agent can increase the viscosity of the water-based rust conversion coating and keep the water-based rust conversion coating in a uniform state.
Further, the component B comprises the following components in percentage by mass: 60-70% of the nano modified acrylic resin, 5-10% of the nano fumed silica, and optionally 0.1-3.4% of the additive, and the balance being water.
Further, the component B comprises the following components in percentage by mass: 5-10% of nano fumed silica, 60-70% of nano modified acrylic resin, 0.4-0.8% of leveling agent, 0.1-0.5% of dispersing agent, 0.2-0.6% of defoaming agent, 0.8-1.5% of thickening agent and the balance of water.
In some preferred embodiments of the present invention, the nano fumed silica content is typically, but not limited to, 5%,8% or 10%; the nano-modified acrylic resin content is typically, but not limited to, 60%,65% or 70%; leveling agent content is typically, but not limited to, 0.4%,0.6% or 0.8%; the dispersant content is typically, but not limited to, 0.1%,0.3% or 0.5%; the defoamer content is typically, but not limited to, 0.2%,0.4% or 0.6%; the thickener content is typically, but not limited to, 0.8%,1.2% or 1.5%.
According to the preparation method of the water-based rust conversion coating provided by the third aspect of the invention, the component A and the component B are uniformly mixed to obtain the water-based rust conversion coating.
Further, the mass ratio of the component A to the component B is 1:6-8.
In some preferred embodiments of the invention, the mass ratio of the aqueous rust converting agent and said component B is typically, but not limited to, 1:6,1:7 or 1:8.
the preparation method of the water-based rust conversion coating provided by the invention has the advantages of simple components, convenience in configuration and strong process operability, and is suitable for large-scale industrial production.
Further, the preparation method of the component A comprises the steps of uniformly mixing the tea polyphenol, the gallic acid, optional conversion auxiliary agent, optional auxiliary agent and water to obtain the component A;
preferably, the preparation method of the component B comprises the steps of uniformly mixing the nano modified acrylic resin, the nano fumed silica and the optional additive to obtain the component B;
preferably, the means of mixing comprises stirring;
preferably, the stirring speed is 350-450r/min.
Stirring refers to the operation of stirring liquid to make it circularly flow so as to uniformly mix materials or accelerate physical and chemical processes.
The rotational speed of the agitation is determined based on the mixing effect and the viscosity of the material in the aqueous rust conversion coating. In some preferred embodiments of the present invention, the rotational speed of the agitation is typically, but not limited to, 350r/min,400r/min or 450r/min.
Some embodiments of the present invention will be described in detail below with reference to examples. The following embodiments and features of the embodiments may be combined with each other without conflict.
The specifications and types of raw materials used in the examples and comparative examples of the present invention are shown in the following Table 1, and are commercially available as they are not illustrated in the tables, and the percentages used in the examples and comparative examples refer to mass percentages.
TABLE 1 raw materials specification and model Meter
Example 1
The embodiment provides an aqueous rust conversion agent, which specifically comprises the following steps: uniformly mixing 2.5% of tea polyphenol, 4% of gallic acid and the balance of deionized water, heating to 65 ℃, stirring at a high speed for 30min, and controlling the rotating speed at 800r/min; then the rotational speed is reduced to room temperature, and the aqueous rust transforming agent is obtained.
Example 2
The embodiment provides an aqueous rust conversion agent, which specifically comprises the following steps:
(1) Mixing 10% of nonionic emulsifier with 77% of deionized water to obtain a standby liquid;
(2) Adding 2.5% of tea polyphenol, 4% of gallic acid, 3.5% of sodium tripolyphosphate, 1% of sodium aminomethylene phosphonate and 2% of triethanolamine phosphate into the standby liquid obtained in the step (1), uniformly mixing, heating to 65 ℃, stirring at a high speed for 30min, and controlling the rotating speed at 800r/min; then the rotational speed is reduced to room temperature, and the aqueous rust transforming agent is obtained.
Example 3
The embodiment provides an aqueous rust conversion agent, which specifically comprises the following steps:
(1) Mixing 10% of nonionic emulsifier with 73% of deionized water to obtain a standby liquid;
(2) Adding 2.5% of tea polyphenol, 5% of gallic acid, 5% of sodium tripolyphosphate, 2% of sodium aminomethylene phosphonate and 2.5% of triethanolamine phosphate into the standby liquid obtained in the step (1), uniformly mixing, heating to 70 ℃, stirring at a high speed for 30min, and controlling the rotating speed to 1000r/min; then the rotational speed is reduced to room temperature, and the aqueous rust transforming agent is obtained.
Example 4
The embodiment provides an aqueous rust conversion agent, which specifically comprises the following steps:
(1) Mixing 11% of nonionic emulsifier with 79% of deionized water to obtain a standby liquid;
(2) Adding 4% of tea polyphenol, 5% of gallic acid, 6% of sodium tripolyphosphate, 2.5% of sodium aminomethylene phosphonate and 3.5% of triethanolamine phosphate into the standby liquid obtained in the step (1), uniformly mixing, heating to 70 ℃, stirring at a high speed for 30min, and controlling the rotating speed to 1200r/min; then the rotational speed is reduced to room temperature, and the aqueous rust transforming agent is obtained.
Example 5
The embodiment provides a water-based rust conversion coating, which specifically comprises the following steps:
(1) Preparing a component B: under the conditions of room temperature and rotating speed of 400r/min, 65 percent of nano modified acrylic resin and the balance of deionized water are added; stirring for 30min after the addition is completed;
(2) The aqueous rust converting agent obtained in example 1 and component B obtained in step (1) were mixed according to 1:6, uniformly mixing the materials according to the mass ratio to obtain the water-based rust conversion coating.
Example 6
The embodiment provides a water-based rust conversion coating, which specifically comprises the following steps:
(1) Preparing a component B: under the conditions of room temperature and rotating speed of 400r/min, adding 6% of nano fumed silica, 65% of nano modified acrylic resin, 0.5% of flatting agent, 0.15% of dispersing agent, 0.2% of defoaming agent, 1% of thickening agent and the balance of deionized water; stirring for 30min after the addition is completed;
(2) The aqueous rust converting agent obtained in example 2 and component B obtained in step (1) were mixed according to 1:6, uniformly mixing the materials according to the mass ratio to obtain the water-based rust conversion coating.
Example 7
The embodiment provides a water-based rust conversion coating, which specifically comprises the following steps:
(1) Preparing a component B: at room temperature and rotation speed of 400r/min, 8% of nano fumed silica, 65% of nano modified acrylic resin, 0.5% of flatting agent, 0.3% of dispersing agent, 0.35% of defoaming agent, 1% of thickening agent and 24.85% of deionized water are added; stirring for 30min after the addition is completed;
(2) The aqueous rust converting agent obtained in example 3 and component B obtained in step (1) were mixed according to 1: and 7, uniformly mixing the materials according to the mass ratio to obtain the water-based rust conversion coating.
Example 8
The embodiment provides a water-based rust conversion coating, which specifically comprises the following steps:
(1) Preparing a component B: at room temperature and rotating speed of 450r/min, adding 9% of nano fumed silica, 62% of nano modified acrylic resin, 0.6% of flatting agent, 0.5% of dispersing agent, 0.3% of defoaming agent, 1% of thickening agent and 26.6% of deionized water; stirring for 30min after the addition is completed;
(2) The aqueous rust converting agent obtained in example 4 and component B obtained in step (1) were mixed according to 1: and 7.5, uniformly mixing the materials according to the mass ratio to obtain the water-based rust conversion coating.
Example 9
The embodiment provides a water-based rust conversion coating, which specifically comprises the following steps:
(1) Preparing a component B: under the conditions of room temperature and rotating speed of 450r/min, adding 62 percent of nano modified acrylic resin, 0.6 percent of flatting agent, 0.5 percent of dispersing agent, 0.3 percent of defoaming agent, 1 percent of thickening agent and 35.6 percent of deionized water; stirring for 30min after the addition is completed;
(2) The aqueous rust converting agent obtained in example 2 and component B obtained in step (1) were mixed according to 1: and 8, uniformly mixing the materials according to the mass ratio to obtain the water-based rust conversion coating.
Example 10
The present example provides an aqueous rust conversion coating, which is different from example 7 in that the aqueous rust conversion agent used was obtained in example 2, and other raw materials and steps are the same as those in example 7, and are not described here again.
Example 11
The present example provides an aqueous rust conversion coating, which is different from example 7 in that the aqueous rust conversion agent used was obtained in example 3, and other raw materials and steps are the same as those in example 7, and are not described here again.
Example 12
The present example provides an aqueous rust conversion coating, which is different from example 7 in that the aqueous rust conversion agent used was obtained in example 4, and other raw materials and steps are the same as those in example 7, and are not described here again.
Comparative example 1
The comparative example provides a rust conversion coating, which specifically comprises the following steps:
(1) Mixing 10% of nonionic emulsifier with 77% of deionized water to obtain a standby liquid;
(2) Adding 6.5% of tea polyphenol, 3.5% of sodium tripolyphosphate, 1% of sodium aminomethylene phosphonate and 2% of triethanolamine phosphate into the standby liquid obtained in the step (1), uniformly mixing, heating to 65 ℃, stirring at a high speed for 30min, and controlling the rotating speed at 800r/min; then the rotational speed is reduced to room temperature, and the aqueous rust transforming agent is obtained.
(3) Preparing a component B: under the conditions of room temperature and rotating speed of 400r/min, adding 6% of nano fumed silica, 65% of nano modified acrylic resin, 0.5% of flatting agent, 0.15% of dispersing agent, 0.2% of defoaming agent, 1% of thickening agent and the balance of deionized water; stirring for 30min after the addition is completed;
(4) The aqueous rust conversion agent obtained in the step (2) and the component B obtained in the step (3) are mixed according to the following steps of 1:6, uniformly mixing the materials according to the mass ratio to obtain the water-based rust conversion coating.
Comparative example 2
The comparative example provides a rust conversion coating, which is different from comparative example 1 in that it does not contain tea polyphenol, has a gallic acid content of 6.5%, and other raw materials and steps are the same as those of comparative example 1, and are not described here again.
Comparative example 3
The comparative example provides a rust conversion coating, which is different from comparative example 1 in that the tea polyphenol content is 0.5%, the gallic acid content is 6%, and other raw materials and steps are the same as those of comparative example 1, and are not described herein.
Test examples
The performance test was conducted on the aqueous rust conversion coatings provided in examples 5 to 12 and the rust conversion coatings provided in comparative examples 1 to 3, and the results obtained are shown in Table 2.
The performance test contents are as follows:
paint film thickness test: making a plate according to the requirements of HG/T3668, brushing a coating, measuring three points by using an ST180 coating thickness meter according to GB/T13452.2, and calculating an average value;
paint film appearance test: making a plate according to the requirements of HG/T3668, brushing a coating, then testing according to GB/T1729, and observing the appearance of a paint film;
and (3) testing the fineness of the coating: after the paint is prepared, testing is carried out by a scraper fineness gauge according to QB 8002;
paint film open time: making a plate according to the requirements of HG/T3668, brushing a coating, then testing according to GB/T1728, and judging the surface drying time of a paint film;
paint film dry time: making a plate according to the requirements of HG/T3668, brushing the paint, then testing according to GB/T1728, and judging the real drying time of a paint film;
adhesion test: making a plate according to the requirements of HG/T3668, brushing a coating, and then testing according to GB/T9286 to judge the adhesive force of the coating;
impact resistance: making a plate according to the requirements of HG/T3668, brushing a coating, and then performing an impact resistance test according to the requirements of GB/T1732;
and (3) paint film water resistance test: making a plate according to the requirements of HG/T3668, brushing a coating, and then testing the water resistance of a paint film according to the requirements of GB/T1733;
acid resistance test of paint film: making a plate according to the requirements of HG/T3668, brushing a coating, and then testing the acid resistance of a paint film according to the requirements of GB/T9274;
alkali resistance test of paint film: making a plate according to the requirements of HG/T3668, brushing a coating, and then testing the alkali resistance of a paint film according to the requirements of GB/T9265;
salt spray resistance test of paint film: making a plate according to the requirements of HG/T3668, brushing a coating, and then testing the salt spray resistance of a paint film according to the requirements of GB/T1771;
rust conversion degree test: selecting a steel plate with the GB/T9286 rust grade of C, brushing the paint to be detected according to the coating rate of 8.5 square meters per kg, cutting the rust part by a blade after 24 hours, and observing the rust conversion degree;
rust conversion time test: the steel plate with GB/T9286 corrosion grade of C level is selected, the paint to be measured is painted according to the coating rate of 8.5 square meters per kg, and from the end of the painting, the time from original natural color to complete blackening of the steel plate is recorded by a stopwatch.
Table 2 coating performance test data sheet
Remarks: the "none" in the above table indicates that none of the comparative examples 1, 2 and 3 has this property.
As can be seen from Table 2, the aqueous rust conversion coating of examples 5 to 12 of the present invention has good adhesion, effectively prevents the continued development of rust, and has excellent impact resistance, water resistance, acid resistance, alkali resistance and salt spray resistance.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. The water-based rust conversion coating is characterized by comprising the following components in percentage by mass: 6-8, component A and component B;
the component A is an aqueous rust conversion agent, and the aqueous rust conversion agent comprises the following components in percentage by mass: 2-7% of tea polyphenol, 4-10% of gallic acid, 3-8% of sodium tripolyphosphate, 1-3% of sodium aminomethylene phosphonate, 2-5% of triethanolamine phosphate, 8-13% of optional auxiliary agent and the balance of water;
the auxiliary agent comprises a nonionic emulsifier;
the component B comprises nano modified acrylic resin, nano fumed silica and optional additives.
2. The aqueous rust conversion coating of claim 1, wherein the additive comprises at least one of a leveling agent, a dispersant, a defoamer, or a thickener.
3. The aqueous rust conversion coating of claim 2, wherein component B comprises the following components in mass percent: 60-70% of the nano modified acrylic resin, 5-10% of the nano fumed silica, and optionally 0.1-3.4% of the additive, and the balance being water.
4. The aqueous rust conversion coating according to claim 3, characterized in that the component B comprises the following components in mass percent: 5-10% of nano fumed silica, 60-70% of nano modified acrylic resin, 0.4-0.8% of leveling agent, 0.1-0.5% of dispersing agent, 0.2-0.6% of defoaming agent, 0.8-1.5% of thickening agent and the balance of water.
5. The method for preparing an aqueous rust conversion coating according to any one of claims 1 to 4, characterized in that the component a and the component B are uniformly mixed to obtain an aqueous rust conversion coating.
6. The method for preparing the aqueous rust conversion coating according to claim 5, characterized in that the preparation method of the component A is to uniformly mix the tea polyphenol, the gallic acid, optional conversion auxiliary agent, optional auxiliary agent and water to obtain the component A;
the preparation method of the component B comprises the steps of uniformly mixing the nano modified acrylic resin, the nano fumed silica and the optional additive to obtain the component B;
the mixing mode comprises stirring;
the stirring speed is 350-450r/min.
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