CN111995931A - Thick-paste epoxy heavy-duty anticorrosive paint capable of being coated with rust and preparation method thereof - Google Patents
Thick-paste epoxy heavy-duty anticorrosive paint capable of being coated with rust and preparation method thereof Download PDFInfo
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
- C08G59/4014—Nitrogen containing compounds
- C08G59/4042—Imines; Imides
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- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/44—Amides
- C08G59/46—Amides together with other curing agents
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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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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/325—Calcium, strontium or barium phosphate
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- C08K3/00—Use of inorganic substances as compounding ingredients
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Abstract
The invention relates to the technical field of heavy anti-corrosion paint, in particular to heavy-duty epoxy heavy anti-corrosion paint capable of being painted with rust and a preparation method thereof, wherein the heavy-duty epoxy heavy anti-corrosion paint capable of being painted with rust comprises a first component and a second component, wherein the first component comprises epoxy resin, a phosphate compound, barium petroleum sulfonate and an epoxy active diluent; the second component includes a curing agent. The thick-paste epoxy heavy-duty anticorrosive coating capable of being coated with rust, provided by the invention, has excellent corrosion resistance and adhesion to a rusty base material, sanding is not required, the adhesion to the rusty base material reaches 11MPa, the salt spray resistance reaches 3000h, the service life of a coating is effectively prolonged, the preparation process is simple and convenient, the flexibility is good, the number of construction tracks for coating maintenance is reduced, the thickness of a film formed at one time is high, the maintenance of a large-scale steel structure is facilitated, the pretreatment time of the base material can be greatly shortened, the number of construction tracks is reduced, a long-acting protection effect is provided for a member, and the thick-paste epoxy heavy-duty anticorrosive coating has a wide market.
Description
Technical Field
The invention relates to the technical field of heavy-duty anticorrosive paint, in particular to heavy-duty epoxy heavy-duty anticorrosive paint capable of being coated with rust and a preparation method thereof.
Background
At present, before the construction of most heavy anti-corrosion coatings on steel substrates, surface treatment is needed, and the surface treatment grade of the steel substrates, the adhesion force of heavy anti-corrosion coatings and the anti-corrosion performance are greatly influenced. In the practical application process, in the maintenance process after large steel structure facilities such as large buildings, bridges, platforms and complex equipment reach a certain service life, due to the limitation of construction conditions, sites and the like, rust removal cannot be performed by adopting modes such as sand blasting or shot blasting, rust removal can only be performed by adopting a manual or electric tool, the base material at the moment is subjected to rust removal, but cannot reach the St3 rust removal grade required by the common heavy anti-corrosion paint, the coating of the heavy anti-corrosion paint is performed on the surface of the base material with unqualified rust removal, the adhesive force and the anti-corrosion performance of the coating are influenced, the service life of the coating is influenced, and the maintenance period is shortened. If the required derusting grade reaches St3 grade, extra manpower and material resources are needed, and cost is wasted. The requirement of maintenance coating on the rust removal grade is reduced, and the coating which allows rust coating is adopted as the primer for construction, so that the method is a thought for solving the problems.
The traditional rusty paint is generally water paint, water emulsion is used as a film forming substance, acidic substances such as phosphoric acid, tannic acid, gallic acid, phytic acid and the like are added as a rust converting agent, and when the water rusty paint is applied to the surface of a base material, the rust converting agent reacts with rust and the base material to form a black passive film, so that the effect of coating the rusty paint is achieved. The disadvantages of this type of coating are: firstly, acid mist is easily generated in the using process, certain environmental pollution is caused, and the health of constructors is harmed; secondly, the whole emulsion is acidic, special modification needs to be carried out on the emulsion in order to prevent emulsion breaking, and the matched intermediate paint and finish paint have higher acid resistance requirements; thirdly, the coating has certain corrosion effect on the base material which is not rusted, and the protection life of the coating is influenced; fourthly, the film forming substance has stronger hydrophilicity and is difficult to meet the requirement of heavy corrosion prevention; fifthly, the coating has low film forming thickness once, and can meet the long-acting anticorrosion requirement by needing multiple coatings.
The publication No. CN103980799A of epoxy self-repairing rusty paint with rust conversion and stabilization, whose publication date is 2014 8, 13, discloses a method for coating by using organic films such as phosphoric acid and tannic acid, which solves the compatibility problem of acidic compounds and solvent type paint film forming substances; the acid composition after being coated is added into the epoxy coating, so that the prepared epoxy self-repairing rusty coating hinders the permeation of corrosive media, and the anti-corrosion performance of the coating is improved. However, the coating process adopts a cross-linked product of epoxy resin and a curing agent as a film structure, so that the compactness is good, the rust converting agents such as phosphoric acid, tannic acid and the like in the coating are difficult to release, and the rusty coating performance of the coating is influenced.
The publication No. CN105885631A, entitled "Stable permeable composite type rusty coating and preparation method thereof", the publication date is 2016, 8, 24 and discloses that epoxy phosphate is synthesized by phosphoric acid and E44 epoxy resin under the catalysis of naphthenate, and the epoxy phosphate is used as one of the components of the coating to improve the antirust performance of the coating. However, the reaction of phosphoric acid and E44 epoxy resin to prepare epoxy phosphate ester can not be completely carried out, and the incompletely reacted phosphoric acid still exists in the coating system and affects the corrosion resistance of the coating due to high water absorption.
In the solvent type rusty paint, the dispersibility of rust converting agents such as phosphoric acid and tannic acid is weak, and the rust converting agents are acidic, so that the service life of a coating is inevitably shortened after the rust converting agents are added into the coating, and the problem that a paint film is easy to generate foaming and the like is caused. An environmental protection type high permeability modified epoxy rusty paint with publication number CN110835490A, the publication date is 2020, 2, 25 days, the paint adopts acid rust converting agent such as phosphoric acid, ferrocyanide, salicylic acid, chromic acid, oxalic acid, tannic acid, etc., and is directly mixed into epoxy resin to prepare the rusty paint, the salt water resistance of the rusty paint is 7 days, and the requirement of heavy corrosion resistance is difficult to meet.
Disclosure of Invention
In order to solve the problem mentioned in the background art that the existing coating capable of being painted with rust has poor corrosion resistance, the invention provides a heavy-duty epoxy anticorrosive coating capable of being painted with rust, which comprises a first component and a second component, wherein the first component comprises epoxy resin, a phosphate compound, barium petroleum sulfonate and an epoxy active diluent;
the second component includes a curing agent.
On the basis of the scheme, the mass ratio of the first component to the second component is (3-7): 1;
on the basis of the above scheme, further, the epoxy resin is selected from a first epoxy resin, a second epoxy resin, and a mixture thereof;
the first epoxy resin is one or a composition of more of bisphenol A epoxy resin, novolac epoxy resin and bisphenol F epoxy resin with the epoxy equivalent of 160-200 g/eq;
the second epoxy resin is one or a combination of bisphenol A epoxy resin and bisphenol F epoxy resin with the epoxy equivalent of 480-550 g/eq.
On the basis of the scheme, the epoxy reactive diluent is a hydrophobic long-chain aliphatic epoxy reactive diluent with the epoxy equivalent of 450-550 g/eq.
On the basis of the scheme, further, the content of barium sulfonate in the petroleum barium sulfonate is more than or equal to 55 percent; the content is determined according to SH/T0391 appendix A, and therefore is not described in detail.
On the basis of the scheme, the phosphate compound is one or a combination of zinc phosphate, aluminum tripolyphosphate, calcium phosphate and strontium phosphate.
On the basis of the scheme, the curing agent is selected from a first curing agent, a second curing agent and a mixture of the first curing agent and the second curing agent;
the first curing agent is a polyamide curing agent with an amine value of 350-450mgKOH/g and an active hydrogen equivalent of 100-200;
the second curing agent is a ketimine addition polyamide curing agent, the amine value is 100-200mgKOH/g, and the active hydrogen equivalent is 100-300.
On the basis of the scheme, the first component further comprises a thixotropic agent, and the thixotropic agent is one or a composition of more of bentonite, polyamide wax and fumed silica.
On the basis of the scheme, the preparation method of the first component further comprises the following steps:
(1) mixing epoxy resin, phosphate compound, barium petroleum sulfonate and epoxy active diluent;
(2) adding a thixotropic agent into the mixture obtained in the step (1), and sequentially dispersing, standing and activating at 50-70 ℃.
On the basis of the scheme, the first component further comprises a water absorbent, and the water absorbent is aluminum silicate with water adsorption capacity more than or equal to 20% and fineness less than or equal to 50 microns.
On the basis of the scheme, the first component further comprises a filler, and the filler is one or a composition of more of talcum powder, titanium dioxide, precipitated barium sulfate, mica powder, sericite powder, feldspar powder, wollastonite powder, iron oxide red and composite iron-titanium powder.
On the basis of the scheme, the first component further comprises an auxiliary agent, and the auxiliary agent is one or a combination of more of silicone oil, BYKA530, BYK023, BYK052, BYK053, BYK057, BYK077, BYK110, BYK112, BYK163, BYK180, BYK190, BYK2010, KH-550, KH-560 and KH-570.
On the basis of the scheme, the first component further comprises a solvent, wherein the solvent is one or more of benzene, toluene, xylene, n-butanol, propanol, ethanol, cyclohexanone, propylene glycol methyl ether acetate, ethyl acetate, butyl acetate and acetone.
On the basis of the scheme, the first component comprises the following raw materials in parts by mass:
on the basis of the scheme, the second component comprises the following raw materials in parts by mass:
30-70 parts of first curing agent
30-70 parts of a second curing agent.
The invention provides a preparation method of a heavy sizing epoxy heavy anti-corrosion coating capable of being coated with rust, which comprises the following steps:
(1) preparing a first component, wherein the first component comprises epoxy resin, phosphate compound, barium petroleum sulfonate and epoxy reactive diluent;
(2) preparing a second component comprising a curing agent;
(3) the first component and the second component are mixed evenly according to the proportion.
On the basis of the scheme, the mass ratio of the first component to the second component is (3-7): 1;
on the basis of the above scheme, further, the epoxy resin is selected from a first epoxy resin, a second epoxy resin, and a mixture thereof;
the first epoxy resin is one or a composition of more of bisphenol A epoxy resin, novolac epoxy resin and bisphenol F epoxy resin with the epoxy equivalent of 160-200 g/eq;
the second epoxy resin is one or a combination of bisphenol A epoxy resin and bisphenol F epoxy resin with the epoxy equivalent of 480-550 g/eq.
On the basis of the scheme, the epoxy reactive diluent is a hydrophobic long-chain aliphatic epoxy reactive diluent with the epoxy equivalent of 450-550 g/eq.
On the basis of the scheme, further, the content of barium sulfonate in the petroleum barium sulfonate is not less than 55%.
On the basis of the scheme, the phosphate compound is one or a combination of zinc phosphate, aluminum tripolyphosphate, calcium phosphate and strontium phosphate.
On the basis of the scheme, the curing agent is selected from a first curing agent, a second curing agent and a mixture of the first curing agent and the second curing agent;
the first curing agent is a polyamide curing agent with an amine value of 350-450mgKOH/g and an active hydrogen equivalent of 100-200;
the second curing agent is a ketimine addition polyamide curing agent, the amine value is 100-200mgKOH/g, and the active hydrogen equivalent is 100-300.
On the basis of the scheme, the first component further comprises a thixotropic agent, and the thixotropic agent is one or a composition of more of bentonite, polyamide wax and fumed silica.
On the basis of the scheme, the preparation method of the first component further comprises the following steps:
(1) mixing epoxy resin, phosphate compound, barium petroleum sulfonate and epoxy active diluent;
(2) adding a thixotropic agent into the mixture obtained in the step (1), and sequentially dispersing, standing and activating at 50-70 ℃.
On the basis of the scheme, the first component further comprises a water absorbent, and the water absorbent is aluminum silicate with water adsorption capacity more than or equal to 20% and fineness less than or equal to 50 microns.
On the basis of the scheme, the first component further comprises a filler, and the filler is one or a composition of more of talcum powder, titanium dioxide, precipitated barium sulfate, mica powder, sericite powder, feldspar powder, wollastonite powder, iron oxide red and composite iron-titanium powder.
On the basis of the scheme, the first component further comprises an auxiliary agent, and the auxiliary agent is one or a combination of more of silicone oil, BYKA530, BYK023, BYK052, BYK053, BYK057, BYK077, BYK110, BYK112, BYK163, BYK180, BYK190, BYK2010, KH-550, KH-560 and KH-570.
On the basis of the scheme, the first component further comprises a solvent, wherein the solvent is one or more of benzene, toluene, xylene, n-butanol, propanol, ethanol, cyclohexanone, propylene glycol methyl ether acetate, ethyl acetate, butyl acetate and acetone.
The invention provides a heavy paste epoxy heavy anti-corrosion coating capable of being coated with rust and a preparation method thereof, and the heavy paste epoxy heavy anti-corrosion coating has the following technical principles:
(1) the adhesive force of the coating on the rusty base material is improved through the synergistic effect of the phosphate filler, the barium petroleum sulfonate, the first epoxy resin, the second curing agent and the hydrophobic long-chain aliphatic epoxy active diluent. The barium petroleum sulfonate is an amphoteric molecule, the sulfonic acid base end of the barium petroleum sulfonate is strong in polarity and easy to adsorb on the surface of rust, the other end of the barium petroleum sulfonate is a long-chain nonpolar hydrocarbon group which is strong in hydrophobicity and can be combined with organic matters such as resin of a coating system, when the barium petroleum sulfonate acts on the rust, the barium petroleum sulfonate can realize coating modification on the rust, the barium petroleum sulfonate can be converted into a harmless oleophilic substance from a hydrophilic substance, so that the effects of removing the surface floating rust of a base material and improving the adhesion of the coating to the base material are realized, the rust molecular groups subjected to surface modification are subjected to coordination and complexation under the action of phosphate radicals in phosphate fillers, and the rust molecules are further fixed as a pigment component of the coating, so that the harmless conversion of the rust is realized, and the adhesion.
In addition, the complexing action of the phosphoric acid group and the iron substrate and the strong polar sulfonic functional group of the barium petroleum sulfonate promote the adhesion of the coating to the substrate.
The second curing agent is a ketimine addition polyamide curing agent, the ketimine addition polyamide curing agent has good water affinity due to the adoption of ketimine addition, the second curing agent is easy to permeate into pores between rust and a base material due to the fact that the rust contains a large amount of crystal water, meanwhile, a part of micromolecule first epoxy resin with good permeability is added in the formula and can be matched with the second curing agent, cross-linking of a matrix resin structure is achieved in the pores between the rust and the base material, and accordingly the adhesive force of a coating and the base material is improved. The hydrophobic long-chain aliphatic epoxy active diluent has the function of a curing reaction chain stopping agent, can prolong the actual drying time of the coating, and can ensure that the fluidity of the coating kept for a long time can fully permeate into pores between rust and a base material, thereby realizing the effect of improving the adhesive force.
(2) The corrosion resistance of the coating is improved through the synergistic effect of the phosphate filler, barium petroleum sulfonate, the water absorbent, the second curing agent and the hydrophobic long-chain aliphatic epoxy active diluent. Under the complexing action of the phosphate filler and the base material, a passive film is formed to improve the corrosion resistance of the coating.
The barium petroleum sulfonate and the hydrophobic long-chain aliphatic epoxy active diluent both contain a large number of nonpolar functional groups, so that the overall polarity of the coating can be reduced, water molecules are promoted to migrate to the surface of the coating, the hydrophobicity of the surface of the coating can be improved, and the corrosion resistance of the coating is improved. The water absorbent and the second curing agent both have the function of absorbing or converting water molecules in the rust, thereby preventing the rust from further diffusing and improving the corrosion resistance of the coating. The viscosity of the hydrophobic long-chain aliphatic epoxy active diluent is low, the solid content of the coating can be effectively improved after the hydrophobic long-chain aliphatic epoxy active diluent is added, and the dosage of a solvent is reduced, so that the defects of film-forming substances caused in the solvent volatilization process are reduced, and the corrosion resistance of the coating is improved. In addition, the second epoxy resin and the first curing agent in the formula have larger molecular weight, so that a macromolecular film can be quickly formed on the surface layer of the coating when the coating is cured, the interference of water vapor and the like in the curing process environment on the curing of the coating is avoided, and the applicability of the coating in various environments is improved.
(3) The flexibility and the workability of the coating are improved through the synergistic effect of the hydrophobic long-chain aliphatic epoxy active diluent, the barium petroleum sulfonate, the second epoxy resin and the first curing agent, and the hydrophobic long-chain aliphatic epoxy active diluent and the barium petroleum sulfonate both contain long aliphatic chains, so that the toughening effect of the formula can be realized. The second epoxy resin and the first curing agent are also good in flexibility due to their large molecular weights. Therefore, the formula has better toughness and bending resistance, and can realize effective coating on edges and curved surfaces.
(4) By fully activating the thixotropic agent network system, the sag resistance and the one-time film forming thickness of the coating are improved. In order to realize rust conversion and improve the corrosion resistance, the system has more nonpolar chain segments, and the thixotropic agent needs to be activated under a certain polar condition, so that the thixotropic effect is realized.
If the thixotropic agent is added and then activated for about 10-50min at 50-70 ℃ according to the traditional paint preparation process, better thixotropy is difficult to achieve; if the nonpolar chain segment of the system is reduced, the conversion effect of the rust layer of the formula and the corrosion resistance of the coating are influenced. In order to solve the problems, the process adopted by the invention is that the thixotropic agent is firstly dispersed at a high speed for 10-20min at the rotating speed of 800 plus 1500rpm, then the machine is stopped and kept stand for more than 1.5h, and then the thixotropic agent is dispersed at a high speed for 10-50min at the rotating speed of 800 plus 1500 rpm.
The principle is that firstly, the thixotropic agent is dispersed evenly, then the machine is stopped and kept stand for a period of time, so that the coating system can fully permeate and wet the thixotropic agent, and then the high-speed dispersion is carried out for 10-50min at the rotating speed of 800 plus 1500rpm, so that the system is activated at the temperature of 50-70 ℃. The thixotropic agent is fully permeated and wetted in the process, so that a thixotropic network in the formula can be fully activated, the sag resistance of the coating can reach 475 micrometers, the once film forming thickness can reach 300 micrometers, thick film construction is realized, the construction number of the coating maintenance process can be reduced by the thick film construction mode, the maintenance time is shortened, and the maintenance convenience is provided.
In conclusion, the invention comprehensively improves the adhesive force, the corrosion resistance, the flexibility and the single coating thickness of the rusty base material of the thick-paste epoxy heavy anti-corrosive paint which can be coated with rusty through the mutual synergistic and cooperative action of a plurality of substances.
Compared with the prior art, the thick paste epoxy heavy anti-corrosion coating capable of being coated with rust and the preparation method thereof provided by the invention have the following technical effects:
(1) the adhesive force is high, and the adhesive force on the rusty base material reaches 11 MPa;
(2) the corrosion resistance is good, and the coating does not blister, rust or fall off after a salt spray resistance test for 3000 hours;
(3) the flexibility is good, and the flexibility is 1 mm;
(4) good sagging property, the coating sagging resistance can reach 475 mu m, and the once film forming thickness can reach 300 mu m.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly and completely describe the embodiments of the present invention, and obviously, the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a preparation method of a heavy sizing epoxy heavy anti-corrosion coating capable of being coated with rust, which comprises the following steps of preparing a first component and a second component:
the preparation method of the first component comprises the following steps:
(1) adding barium petroleum sulfonate and the solution into a dispersion cylinder, and soaking overnight to prepare barium petroleum sulfonate liquid;
(2) adding the first epoxy resin, the second epoxy resin reactive diluent and the auxiliary agent, and dispersing for 5-15min at 300-800 rpm;
(3) adding a water absorbent, a filler and a phosphate compound into a dispersion cylinder, and dispersing at a high speed at the rotating speed of 800-1500rpm until the fineness is less than or equal to 100 mu m;
(4) adding a thixotropic agent, dispersing at a high speed of 800 plus 1500rpm for 10-20min, stopping the machine, standing for more than 1.5h, and dispersing at a high speed of 800 plus 1500rpm for 10-50 min;
(5) filtering and packaging to obtain the finished product.
The preparation method of the component B comprises the following steps:
(1) adding a first curing agent and a second curing agent into a dispersion cylinder under the low-speed stirring of 50rpm, and then dispersing at a low speed of 500rpm for 5-10 min;
(2) filtering and packaging to obtain the finished product.
After the first component and the second component are prepared, before the first component and the second component are used, the first component and the second component are mixed according to the mass ratio of (3-7): 1, and then the construction can be carried out after the materials are uniformly mixed.
The invention provides the examples shown in the following table:
table 1 example composition table
The solvent used in example 1 is n-butanol, the first epoxy resin is bisphenol F epoxy resin with an epoxy equivalent of 178g/eq, the second epoxy resin is bisphenol F epoxy resin with an epoxy equivalent of 480g/eq, the epoxy active diluent is a hydrophobic long-chain aliphatic epoxy active diluent with an epoxy equivalent of 550g/eq, the auxiliary agent is KH560, the filler is titanium dioxide, the phosphate compound is zinc phosphate, the thixotropic agent is fumed silica, the first curing agent is a polyamide curing agent with an amine value of 410mgKOH/g and an active hydrogen equivalent of 100, the second curing agent is a ketimine addition polyamide curing agent with an amine value of 160mgKOH/g and an active hydrogen equivalent of 271;
the mass ratio of the first component to the second component is 7: 1;
the solvent used in example 2 is xylene, the first epoxy resin is a bisphenol a epoxy resin having an epoxy equivalent of 196g/eq, the second epoxy resin is a bisphenol a epoxy resin having an epoxy equivalent of 500g/eq, the epoxy reactive diluent is a hydrophobic long-chain aliphatic epoxy reactive diluent having an epoxy equivalent of 500g/eq, the auxiliary agent is BYK110, the filler is red iron oxide, the phosphate compound is aluminum tripolyphosphate, the thixotropic agent is polyamide wax, the first curing agent is a polyamide curing agent having an amine value of 400mgKOH/g and an active hydrogen equivalent of 100, the second curing agent is a ketimine addition polyamide curing agent having an amine value of 130mgKOH/g and an active hydrogen equivalent of 270;
the mass ratio of the first component to the second component is 5: 1;
the solvent used in example 3 is propylene glycol methyl ether acetate, the first epoxy resin is novolac epoxy resin having an epoxy equivalent of 171g/eq, the second epoxy resin is bisphenol a epoxy resin having an epoxy equivalent of 550g/eq, the epoxy reactive diluent is hydrophobic long-chain aliphatic epoxy reactive diluent having an epoxy equivalent of 450g/eq, the auxiliary agent is BYK a530, the filler is composite ferrotitanium powder, the phosphate compound is strontium phosphate, the thixotropic agent is organic bentonite, the first curing agent is polyamide curing agent having an amine value of 420mgKOH/g and an active hydrogen equivalent of 200, the second curing agent is a ketimine addition polyamide curing agent having an amine value of 180mgKOH/g and an active hydrogen equivalent of 110.
The mass ratio of the first component to the second component is 3: 1;
the invention also provides comparative examples as shown in the following table:
table 2 comparative example components 1 table
Table 3 comparative example component 2 table
Wherein, the comparative example 1 adopts a coating prepared from CN104559668A published as waterborne anticorrosive coating for improving the interface bonding force between rusty metal and anticorrosive coating and a preparation method thereof;
comparative example 2 a coating prepared from epoxy self-repairing rusty coating with rust layer conversion and stabilization, publication No. CN 103980799A;
comparative example 3 was identical to the preparation method of example 2, except that barium petroleum sulfonate was not added;
comparative example 4 was in accordance with the preparation method of example 2, only the phosphate compound was not added;
comparative example 5 the preparation method of example 2 was identical, with no first epoxy resin added;
comparative example 6 was consistent with the preparation of example 2, with no second epoxy resin added;
comparative example 7 was consistent with the preparation of example 2, with no epoxy reactive diluent added;
comparative example 8 was in accordance with the production method of example 2, with only no water-absorbing agent added;
comparative example 9 was consistent with the preparation method of example 2, with no first curing agent added;
comparative example 10 was prepared in accordance with the method of example 2, with no second curing agent added;
comparative example 11 is the same as the preparation method of example 2, only the addition process of the thixotropic agent is changed into the process of directly activating the thixotropic agent at 50-70 ℃ for 10-50min after the thixotropic agent is added;
the above examples and comparative examples were subjected to performance tests, and the relevant test standards are shown in Table 4, and the test results are shown in tables 5 to 8.
TABLE 4 Main test indices of the coatings
| Item | Detection method |
| Adhesion (rusted panels St2), MPa | GB/T 5210 |
| Adhesion (Sa2.5 base material), MPa | GB/T 5210 |
| Salt spray resistance, h | GB/T 1771 |
| Flexibility，mm | GB/T 1731 |
| Sag resistance, μm | GB/T 9264 |
| Thickness of primary film formation, μm | GB/T 4956 |
Table 5 examples performance test results
Table 6 comparative example performance test 1 table
| Item | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Adhesion (rusted panels St2), MPa | 6.2 | Not tested | 3.2 | 2.8 |
| Adhesion (Sa2.5 base material), MPa | Not tested | Level 0 | 8.7 | 6.3 |
| Salt spray resistance, h | 1000 | 72 | 2100 | 2300 |
| Flexibility, mm | 1 | Not tested | 2 | 1 |
| Sag resistance, μm | Not tested | Not tested | 475 | 475 |
| Thickness of primary film formation, μm | Not tested | 90 | 300 | 300 |
Table 7 comparative example performance test 2 table
| Item | Comparative example 5 | Comparative example 6 | Comparative example 7 | Comparative example 8 |
| Adhesion (rusted panels St2), MPa | 4.2 | 10.5 | 3.0 | 11.2 |
| Adhesion (Sa2.5 base material), MPa | 9.0 | 12.3 | 8.2 | 12.5 |
| Salt spray resistance, h | 2000 | 3500 | 2200 | 2800 |
| Flexibility, mm | 1 | 2 | 2 | 1 |
| Sag resistance, μm | 475 | 475 | 475 | 475 |
| Thickness of primary film formation, μm | 300 | 300 | 300 | 300 |
Table 8 comparative example performance test 3 table
| Item | Comparative example 9 | Comparative example 10 | Comparative example 11 |
| Adhesion (rusted panels St2), MPa | 10.1 | 3.8 | 11.8 |
| Adhesion (Sa2.5 base material), MPa | 12.0 | 9.3 | 12.4 |
| Salt spray resistance, h | 3500 | 2200 | 3500 |
| Flexibility, mm | 2 | 1 | 1 |
| Sag resistance, μm | 475 | 475 | 200 |
| Thickness of primary film formation, μm | 300 | 300 | 125 |
According to the above table, the thick paste epoxy heavy anti-corrosion coating capable of being coated with rust can effectively improve the anti-corrosion performance of the coating and the adhesive force of a rusty base material, prolong the service life of the coating, increase the construction convenience, reduce the base material pretreatment cost during coating maintenance, improve the once film-forming thickness of the coating and reduce the number of construction tracks of coating maintenance;
the adhesive force of the coating on the rusty base material is improved through the synergistic effect of the phosphate filler, the barium petroleum sulfonate, the first epoxy resin, the second curing agent and the hydrophobic long-chain aliphatic epoxy active diluent; the corrosion resistance of the coating is improved through the synergistic effect of the phosphate filler, barium petroleum sulfonate, the water absorbent, the second curing agent and the hydrophobic long-chain aliphatic epoxy active diluent; the flexibility and the easy construction performance of the coating are improved through the synergistic effect of the hydrophobic long-chain aliphatic epoxy active diluent, the barium petroleum sulfonate, the second epoxy resin and the first curing agent.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The heavy sizing epoxy heavy anti-corrosion coating capable of being painted with rust comprises a first component and a second component, and is characterized in that the first component comprises epoxy resin, a phosphate compound, barium petroleum sulfonate and an epoxy active diluent;
the second component includes a curing agent.
2. The heavy duty epoxy heavy duty anticorrosive paint capable of being painted with rust according to claim 1, characterized in that the mass ratio of the first component to the second component is (3-7): 1.
3. the heavy duty epoxy heavy duty anticorrosive paint capable of being painted with rust according to claim 1, characterized in that: the epoxy resin is selected from the group consisting of a first epoxy resin, a second epoxy resin, and mixtures thereof;
the first epoxy resin is one or a composition of more of bisphenol A epoxy resin, novolac epoxy resin and bisphenol F epoxy resin with the epoxy equivalent of 160-200 g/eq;
the second epoxy resin is one or a combination of bisphenol A epoxy resin and bisphenol F epoxy resin with the epoxy equivalent of 480-550 g/eq.
4. The heavy duty epoxy heavy duty anticorrosive paint capable of being painted with rust according to claim 1, characterized in that: the epoxy reactive diluent is a hydrophobic long-chain aliphatic epoxy reactive diluent with the epoxy equivalent of 450-550 g/eq.
5. The heavy duty epoxy heavy duty anticorrosive paint capable of being painted with rust according to claim 1, characterized in that: the phosphate compound is one or a composition of more of zinc phosphate, aluminum tripolyphosphate, calcium phosphate and strontium phosphate.
6. The heavy duty epoxy heavy duty anticorrosive paint capable of being painted with rust according to claim 1, characterized in that: the curing agent is selected from the group consisting of a first curing agent, a second curing agent, and mixtures thereof;
the first curing agent is a polyamide curing agent with an amine value of 350-450mgKOH/g and an active hydrogen equivalent of 100-200;
the second curing agent is a ketimine addition polyamide curing agent, the amine value is 100-200mgKOH/g, and the active hydrogen equivalent is 100-300.
7. The mastic epoxy heavy duty anticorrosive paint capable of being painted with rust according to claim 1, wherein the first component further comprises a thixotropic agent, and the thixotropic agent is one or a combination of bentonite, polyamide wax and fumed silica.
8. The rust paintable mastic epoxy heavy duty paint of claim 7, wherein the first component preparation method comprises:
(1) mixing epoxy resin, phosphate compound, barium petroleum sulfonate and epoxy active diluent;
(2) adding a thixotropic agent into the mixture obtained in the step (1), and sequentially dispersing, standing and activating at 50-70 ℃.
9. The heavy duty epoxy heavy duty anticorrosive coating capable of being coated with rust according to claim 1, wherein the first component further comprises a water absorbent, and the water absorbent is aluminum silicate with a water adsorption capacity of not less than 20% and a fineness of not more than 50 μm.
10. A preparation method of a heavy paste epoxy heavy anti-corrosion coating capable of being coated with rust is characterized by comprising the following steps:
(1) preparing a first component, wherein the first component comprises epoxy resin, phosphate compound, barium petroleum sulfonate and epoxy reactive diluent;
(2) preparing a second component comprising a curing agent;
(3) the first component and the second component are mixed evenly according to the proportion.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109810612A (en) * | 2017-11-21 | 2019-05-28 | 石磊 | Anticorrosive paint and preparation method thereof |
| CN109825164A (en) * | 2019-01-24 | 2019-05-31 | 烟台优尼科新材料科技有限公司 | Solventless epoxy coating suit and its preparation method and application |
| CN110484095A (en) * | 2019-08-28 | 2019-11-22 | 厦门双瑞船舶涂料有限公司 | One kind thick can apply underwater curing durably anticorrosion paint and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109810612A (en) * | 2017-11-21 | 2019-05-28 | 石磊 | Anticorrosive paint and preparation method thereof |
| CN109825164A (en) * | 2019-01-24 | 2019-05-31 | 烟台优尼科新材料科技有限公司 | Solventless epoxy coating suit and its preparation method and application |
| CN110484095A (en) * | 2019-08-28 | 2019-11-22 | 厦门双瑞船舶涂料有限公司 | One kind thick can apply underwater curing durably anticorrosion paint and preparation method thereof |
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