Universal anticorrosive paint for water-oil primer and preparation method of universal anticorrosive paint

Abstract

The invention provides a water-oil primer universal anticorrosive coating and a preparation method thereof, and belongs to the technical field of anticorrosive coatings. The anticorrosive coating provided by the invention comprises a component A and a component B in parts by weight, and the mass ratio of the component A to the component B is (1-5): 1; the component A is prepared from 40 to 60 parts of water, 30 to 50 parts of waterborne epoxy resin, 1 to 5 parts of graphene derivative, 1 to 5 parts of lithium-containing phosphate, 3 to 10 parts of glass sand, 1 to 3 parts of silane coupling agent, 1 to 3 parts of potassium silicate, 1 to 2 parts of magnesium powder, 1 to 5 parts of nano filler, 1 to 3 parts of thickening agent, 1 to 5 parts of wetting agent and 1 to 3 parts of alkyl glycidyl ether; and the component B comprises 15-30 parts of a waterborne epoxy curing agent and 1-5 parts of an ether solvent. When the paint provided by the invention is coated on the surface of a water-based or solvent-based anti-corrosion primer, a coating with smooth quality can be formed, and the anti-corrosion coating formed after curing has excellent adhesive force and anti-corrosion effect.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion coatings, and in particular to a universal anti-corrosion coating of water-oil primer type and a preparation method thereof. Background Art

[0002] Using anti-corrosion paint to paint the steel structure of ships and other equipment can protect the surface of the steel plate from corrosion. At present, the commonly used anti-corrosion paint is solvent-based paint. Although this kind of paint has the advantages of fast drying, good weather resistance and good corrosion resistance, it contains a large amount of volatile organic compounds, pollutes the environment, wastes energy and has high costs. With the increasing awareness of environmental protection, water-based paint has gradually become a development trend. Although water-based anti-corrosion paint has the advantages of being non-toxic, odorless and abundant in resources, a single water-based anti-corrosion paint has problems such as poor adhesion, hardness and wear resistance, which makes the existing single water-based paint still fail to meet the technical standards of solvent-based paint in terms of comprehensive performance.

[0003] Two-component anti-corrosion coatings have attracted much attention due to their excellent adhesion to a variety of substrates and excellent corrosion resistance of the coating film. At present, there are primers on the market that use water-based anti-corrosion coatings or solvent-based anti-corrosion coatings, and topcoats that use solvent-based anti-corrosion coatings or water-based anti-corrosion coatings, so that the entire composite coating formed has both water-based coatings and solvent-based coatings, and a composite coating that has the advantages of both water-based anti-corrosion coatings and solvent-based anti-corrosion coatings is obtained. However, due to the large difference in surface tension between water-based coatings and solvent-based coatings, the adhesion and adaptability of the composite coating formed after the two coatings are cured are poor, and defects such as shrinkage cavities and oil pits appear, which makes it difficult for the formed composite coating to meet the requirements for performance such as anti-corrosion performance and adhesion.

[0004] Therefore, how to obtain a universal anti-corrosion coating for water-based and oil-based primers that has excellent adhesion and adaptability to both water-based and oil-based primers has become a technical problem that needs to be solved urgently in the field. Summary of the invention

[0005] The object of the present invention is to provide a universal anticorrosive coating for water-based and oil-based primers having excellent adhesion and adaptability to both water-based and oil-based primers and a preparation method thereof.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: The present invention provides a universal anticorrosive coating of water-oil primer, which comprises a component A and a component B in parts by weight, wherein the mass ratio of the component A to the component B is 1-5:1; The component A comprises: 40-60 parts of water, 30-50 parts of waterborne epoxy resin, 1-5 parts of graphene derivatives, 1-5 parts of lithium-containing phosphate, 3-10 parts of glass sand, 1-3 parts of silane coupling agent, 1-3 parts of potassium silicate, 1-2 parts of magnesium powder, 1-5 parts of nanofiller, 1-3 parts of thickener, 1-5 parts of wetting agent and 1-3 parts of alkyl glycidyl ether; The B component includes: 15-30 parts of a water-based epoxy curing agent and 1-5 parts of an ether solvent.

[0007] Preferably, the graphene derivative is sulfonate-modified graphene.

[0008] Preferably, the lithium-containing phosphate comprises lithium iron phosphate and / or lithium manganese phosphate.

[0009] Preferably, the particle size of the glass sand is 400-500 mesh.

[0010] Preferably, the silane coupling agent includes one or more of KH550, KH560, KH570 and KH602.

[0011] Preferably, the nanofiller includes one or more of nano-scale calcium carbonate, nano-scale silicon dioxide and nano-scale titanium dioxide.

[0012] Preferably, the thickener is a polyurethane associative thickener.

[0013] Preferably, the alkyl glycidyl ether is C12-14 alkyl glycidyl ether.

[0014] Preferably, the ether solvent includes one or more of diethylene glycol monobutyl ether, octanol phenyl ether, polypropylene ether and octanol glycol ether.

[0015] The present invention also provides a method for preparing the universal anticorrosive coating of water-oil primer described in the above technical solution, comprising: Mixing water, water-based epoxy resin, graphene derivative, lithium-containing phosphate, glass sand, silane coupling agent, potassium silicate, magnesium powder, nanofiller, thickener, wetting agent and alkyl glycidyl ether to obtain a mixed slurry of component A; The water-based epoxy curing agent and the ether solvent are mixed with the A component mixed slurry to obtain a water-based oil primer universal anti-corrosion coating.

[0016] The invention provides a universal anticorrosive coating for water-oil primer, which comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1-5:1; the component A comprises: 40-60 parts of water, 30-50 parts of water-based epoxy resin, 1-5 parts of graphene derivatives, 1-5 parts of lithium-containing phosphate, 3-10 parts of glass sand, 1-3 parts of silane coupling agent, 1-3 parts of potassium silicate, 1-2 parts of magnesium powder, 1-5 parts of nano filler, 1-3 parts of thickener, 1-5 parts of wetting agent and 1-3 parts of alkyl glycidyl ether; the component B comprises: 15-30 parts of water-based epoxy curing agent and 1-5 parts of ether solvent. The present invention adds a graphene derivative, which has a two-dimensional structure and can play a physical barrier role for corrosive substances in the coating, and the conductivity of graphene is conducive to improving the corrosion resistance of the anti-corrosion coating; the present invention adds a lithium-containing phosphate, and the dissociated lithium ions can react with oxygen, water, etc. in the environment as cathode inhibitor metals, thereby forming a passivation layer to improve the corrosion resistance; the present invention can improve the wear resistance and hardness of the coating by adding glass sand and nanofillers; the present invention adds a silane coupling agent, which can react with the active -SiX in potassium silicate after hydrolysis and / or the -Si-OH bond and magnesium powder to form an inorganic magnesium silicate space network structure, thereby improving the strength and toughness of the anti-corrosion coating and improving the corrosion resistance of the coating; the present invention adds a wetting agent, an alkyl glycidyl ether and an ether solvent, which can improve the wettability of the anti-corrosion coating with a water-based anti-corrosion primer or a solvent-based anti-corrosion primer, thereby enabling it to have an excellent combination effect with the water-based anti-corrosion primer or the solvent-based anti-corrosion primer. The results of the embodiments show that the universal anti-corrosion coating for water-oil primer provided by the present invention can form a smooth and high-quality coating when applied on the surface of water-based anti-corrosion primer or solvent-based anti-corrosion primer, and the anti-corrosion coating formed after curing has excellent anti-corrosion effect. DETAILED DESCRIPTION

[0017] The present invention provides a universal anticorrosive coating of water-oil primer, which comprises a component A and a component B in parts by weight, wherein the mass ratio of the component A to the component B is 1-5:1; The component A comprises: 40-60 parts of water, 30-50 parts of waterborne epoxy resin, 1-5 parts of graphene derivatives, 1-5 parts of lithium-containing phosphate, 3-10 parts of glass sand, 1-3 parts of silane coupling agent, 1-3 parts of potassium silicate, 1-2 parts of magnesium powder, 1-5 parts of nanofiller, 1-3 parts of thickener, 1-5 parts of wetting agent and 1-3 parts of alkyl glycidyl ether; The B component includes: 15-30 parts of a water-based epoxy curing agent and 1-5 parts of an ether solvent.

[0018] In the present invention, unless otherwise specified, the raw materials used in the present invention are all commercially available products in the art.

[0019] In terms of weight, the universal anticorrosive coating of water-oil primer provided by the present invention comprises component A and component B. In the present invention, the mass ratio of component A to component B is 1-5:1, preferably 2-3:1.

[0020] In the present invention, the A component includes 40 to 60 parts of water, preferably 45 to 55 parts. In some embodiments of the present invention, the weight of the water can be 40 parts, 45 parts, 50 parts, 55 parts or 60 parts. In the present invention, the water is used as a dispersion medium.

[0021] Based on 40 to 60 parts by weight of water, the A component of the universal anticorrosive coating of the water-oil primer provided by the present invention includes 30 to 50 parts of waterborne epoxy resin, preferably 35 to 45 parts. In some embodiments of the present invention, the weight of the waterborne epoxy resin may be 35 parts, 40 parts, 45 parts or 50 parts. In the present invention, the waterborne epoxy resin is preferably one or more of bisphenol A epoxy resin, bisphenol F epoxy resin and bisphenol S epoxy resin. In an embodiment of the present invention, the waterborne epoxy resin may be E51 or Allnex 387, and the Allnex 387 is derived from Allnex Corporation of the United States. The present invention utilizes waterborne epoxy resin as a film-forming substance for coating.

[0022] Based on 40 to 60 parts by weight of water, the component A of the universal anticorrosive coating for water-oil primer provided by the present invention comprises 1 to 5 parts of graphene derivatives, preferably 2 to 4 parts. In the present invention, the graphene derivatives can improve the anticorrosive property of the anticorrosive coating.

[0023] In the present invention, the graphene derivative is preferably sulfo-modified graphene. The present invention uses sulfo-modified graphene to improve the dispersibility of graphene in the anti-corrosion coating, thereby making the graphene sheets evenly distributed in the anti-corrosion coating formed after the anti-corrosion coating is cured, thereby improving the corrosion resistance of the anti-corrosion coating.

[0024] In the present invention, the method for preparing the sulfonyl-modified graphene preferably comprises: Mixing p-aminobenzenesulfonic acid, sodium hydroxide solution and NaNO2 to obtain a mixed solution, adding ice water and concentrated hydrochloric acid to the mixed solution, stirring and mixing to obtain a p-aminobenzenesulfonic acid diazonium salt solution; The diazonium p-aminobenzenesulfonate solution is mixed with the graphene oxide solution to carry out a modification reaction to obtain sulfonated modified graphene oxide; The sulfonated graphene oxide is mixed with a reducing agent to carry out a reduction reaction to obtain sulfonated graphene.

[0025] The present invention preferably mixes p-aminobenzenesulfonic acid, sodium hydroxide solution and NaNO2 to obtain a mixed solution, adds ice water and concentrated hydrochloric acid to the mixed solution, and stirs and mixes to obtain a p-aminobenzenesulfonic acid diazonium salt solution.

[0026] In the present invention, the mass ratio of the p-aminobenzenesulfonic acid to NaNO2 is preferably 1-2:0.2; the mass concentration of the sodium hydroxide solution is preferably 1-2%.

[0027] In the present invention, the mass concentration of the sodium hydroxide solution is preferably 1-2%, more preferably 2%. In the present invention, the mass of the p-aminobenzenesulfonic acid and the volume of the sodium hydroxide solution can be 1 g: 1 mL.

[0028] The present invention has no particular limitation on the method of mixing the aminobenzenesulfonic acid, sodium hydroxide solution and NaNO2, as long as the solid can be dissolved to form a mixed solution.

[0029] In the present invention, the volume ratio of the sodium hydroxide solution, ice water and concentrated hydrochloric acid is preferably (1-2):10:(1-2), more preferably 1:10:1.

[0030] In the present invention, the stirring and mixing temperature is preferably 0° C., and the stirring and mixing time is preferably 15 to 20 minutes, more preferably 20 minutes.

[0031] After obtaining the diazonium p-aminobenzenesulfonate solution, the present invention preferably mixes the diazonium p-aminobenzenesulfonate solution with a graphene oxide solution to carry out a modification reaction to obtain sulfonated modified graphene oxide.

[0032] In the present invention, the concentration of the graphene oxide solution is preferably 5-10 mg / mL, more preferably 10 mg / mL.

[0033] In the present invention, the concentration of the graphene oxide solution is 10 mg / mL, and the ratio of the mass of the p-aminobenzenesulfonic acid to the volume of the graphene oxide solution is preferably 1 g:50-60 mL, more preferably 1 g:50 mL.

[0034] In the present invention, the modification reaction is preferably carried out under stirring at room temperature; the modification reaction time is preferably 2 to 3 hours, more preferably 2 hours.

[0035] After obtaining the sulfonated graphene oxide, the present invention preferably mixes the sulfonated graphene oxide with a reducing agent to carry out a reduction reaction to obtain sulfonyl-modified graphene.

[0036] In the present invention, the reducing agent is preferably hydrazine hydrate. The present invention has no particular limitation on the amount of hydrazine hydrate used, as long as it can fully reduce the sulfonated modified graphene oxide.

[0037] In the present invention, the temperature of the reduction reaction is preferably 80-100° C., more preferably 90-100° C., and the time of the reduction reaction is preferably 2-3 h, more preferably 3 h.

[0038] In the present invention, after the reduction reaction, the system obtained by the reaction is preferably centrifuged, washed and dried in sequence to obtain sulfonyl-modified graphene. The present invention has no particular limitation on the methods of centrifugation, washing and drying, as long as the impurities in the sulfonyl-modified graphene can be fully removed and dried.

[0039] Based on 40 to 60 parts by weight of water, the A component of the universal anticorrosive coating for water-oil primer provided by the present invention includes 1 to 5 parts, preferably 2 to 4 parts, of lithium-containing phosphate. In the present invention, the lithium-containing phosphate preferably includes lithium iron phosphate and / or lithium manganese phosphate. The present invention utilizes lithium ions precipitated from lithium-containing phosphate to improve the anticorrosive property of the anticorrosive coating.

[0040] Based on 40 to 60 parts by weight of water, the A component of the universal anticorrosive coating of the water-oil primer provided by the present invention includes 3 to 10 parts of glass sand, preferably 4 to 8 parts. In an embodiment of the present invention, the weight of the glass sand can be 4 parts, 5 parts, 6 parts, 7 parts or 8 parts. In the present invention, the particle size of the glass sand is preferably 400 to 500 meshes, more preferably 500 meshes. Adding glass sand in the present invention can improve the properties of the coating such as wear resistance and hardness.

[0041] Based on 40 to 60 parts by weight of water, component A of the universal anticorrosive coating for water-oil primer provided by the present invention includes 1 to 3 parts of silane coupling agent, preferably 2 to 3 parts. In the present invention, the silane coupling agent preferably includes one or more of KH550, KH560, KH570 and KH602, more preferably KH550 or KH560.

[0042] Based on 40 to 60 parts by weight of water, component A of the universal anticorrosive coating for water-oil primer provided by the present invention includes 1 to 3 parts of potassium silicate, preferably 2 to 3 parts.

[0043] Based on 40 to 60 parts by weight of water, the A component of the universal anticorrosive coating for water-oil primer provided by the present invention includes 1 to 2 parts of magnesium powder, preferably 1 part. The present invention forms an inorganic magnesium silicate spatial network structure by adding a silane coupling agent to form a cross-linking reaction between the active -SiX in potassium silicate after hydrolysis and / or the -Si-OH bond and the magnesium powder, thereby improving the strength and toughness of the anticorrosive coating and improving the corrosion resistance of the coating.

[0044] Based on 40 to 60 parts by weight of water, the A component of the universal anticorrosive coating for water-oil primer provided by the present invention includes 1 to 5 parts of nanofiller, preferably 3 to 4 parts. In the present invention, the nanofiller preferably includes one or more of nanoscale calcium carbonate, nanoscale silicon dioxide and nanoscale titanium dioxide, more preferably nanoscale calcium carbonate. In the present invention, the particle size of the nanofiller is preferably 10 to 100 nm, more preferably 20 to 50 nm. The addition of nanofillers in the present invention can improve the properties of the coating such as wear resistance and hardness.

[0045] Based on 40 to 60 parts by weight of water, the A component of the universal anticorrosive coating of the water-oil primer provided by the present invention includes 1 to 3 parts of a thickener, preferably 2 to 3 parts. In the present invention, the thickener is preferably a polyurethane associative thickener. In an embodiment of the present invention, the grade of the polyurethane associative thickener may be RM-8W. The present invention can adjust the fluidity of the coating by adding a thickener.

[0046] Based on 40 to 60 parts by weight of water, component A of the universal anticorrosive coating of water-oil primer provided by the present invention includes 1 to 5 parts of a wetting agent, preferably 2 to 4 parts. In an embodiment of the present invention, the wetting agent may be Gudao PE100 wetting agent.

[0047] Based on 40 to 60 parts by weight of water, the A component of the universal anticorrosive coating for water-oil primer provided by the present invention includes 1 to 3 parts of alkyl glycidyl ether, preferably 2 to 3 parts. In the present invention, the alkyl glycidyl ether is preferably C12-14 alkyl glycidyl ether. In an embodiment of the present invention, the C12-14 alkyl glycidyl ether is derived from Shandong Jinyufeng New Materials Co., Ltd. The use of alkyl glycidyl ether in the present invention can improve the bonding ability of the anticorrosive layer with the water-based coating and the solvent-based coating.

[0048] The universal anticorrosive coating of water-oil primer provided by the present invention comprises component B in parts by weight.

[0049] Based on 40 to 60 parts by weight of water, the component B of the universal anticorrosive coating for water-oil primer provided by the present invention includes 15 to 30 parts of a waterborne epoxy curing agent, preferably 20 to 25 parts. In the present invention, the waterborne epoxy curing agent is preferably an aromatic amine m-xylylenediamine or a cyclic aliphatic amine isophoronediamine.

[0050] Based on 40 to 60 parts by weight of water, the component B of the universal anticorrosive coating for water-oil primer provided by the present invention includes 1 to 5 parts of ether solvents, preferably 3 to 4 parts. In the present invention, the ether solvent preferably includes one or more of diethylene glycol monobutyl ether, octanol phenyl ether, polypropylene ether and octanol glycol ether, more preferably diethylene glycol monobutyl ether, octanol phenyl ether or polypropylene ether. The present invention uses ether solvents to improve the wettability of the anticorrosive coating and the water-based anticorrosive primer or the solvent-based anticorrosive primer.

[0051] The present invention also provides a method for preparing the universal anticorrosive coating of water-oil primer described in the above technical solution, comprising: Mixing water, water-based epoxy resin, graphene derivative, lithium-containing phosphate, glass sand, silane coupling agent, potassium silicate, magnesium powder, nanofiller, thickener, wetting agent and alkyl glycidyl ether to obtain a mixed slurry of component A; The water-based epoxy curing agent and the ether solvent are mixed with the A component mixed slurry to obtain a water-based oil primer universal anti-corrosion coating.

[0052] The invention mixes water, water-based epoxy resin, graphene derivatives, lithium-containing phosphate, glass sand, silane coupling agent, potassium silicate, magnesium powder, nano filler, thickener, wetting agent and alkyl glycidyl ether to obtain component A mixed slurry.

[0053] In the present invention, the method of mixing water, water-based epoxy resin, graphene derivatives, lithium-containing phosphate, glass sand, silane coupling agent, potassium silicate, magnesium powder, nanofiller, thickener, wetting agent and alkyl glycidyl ether is preferably high-speed stirring and low-speed stirring in sequence. In the present invention, the rotation speed of the high-speed stirring is preferably 500-800r / min, more preferably 600-700r / min; the time of the high-speed stirring is preferably 10-30min, more preferably 20-30min; the rotation speed of the low-speed stirring is preferably 100-300r / min, more preferably 200-300r / min; the time of the low-speed stirring is preferably 10-30min, more preferably 20-30min.

[0054] After obtaining the mixed slurry of component A, the present invention mixes a water-based epoxy curing agent and an ether solvent with the mixed slurry of component A to obtain a universal anti-corrosion coating of water-oil primer.

[0055] In the present invention, the method for mixing the water-based epoxy curing agent and the ether solvent with the mixed slurry of component A is preferably stirring, and the stirring speed is preferably 100~300r / min, more preferably 200~300r / min; the stirring time is preferably 10~30min, more preferably 20~30min.

[0056] The method provided by the invention is simple to operate and can mix the components evenly to form a uniformly dispersed coating.

[0057] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Some raw materials of the universal anticorrosive coating of water-oil primer used in the embodiment of the present invention are: Glass sand with a particle size of 500 mesh; nano-scale calcium carbonate with a particle size of 10~50nm; nano-scale silicon dioxide with a particle size of 10~50nm; The preparation method of the graphene derivative is as follows: 1 g of p-aminobenzenesulfonic acid, 1 mL of a sodium hydroxide solution with a mass concentration of 2% and 0.2 g of NaNO2 are mixed to obtain a mixed solution, 10 mL of ice water and 1 mL of concentrated hydrochloric acid are added to the mixed solution, and the mixture is stirred at 0°C for 15 minutes to obtain a p-aminobenzenesulfonic acid diazonium salt solution; the p-aminobenzenesulfonic acid diazonium salt solution and 50 mL of a 10 mg / mL graphene oxide solution are stirred for 2 hours to obtain sulfonated graphene oxide; the sulfonated graphene oxide is mixed with hydrazine hydrate, reacted at 90°C for 2 hours, and sulfonated graphene is obtained after centrifugation, washing and drying.

[0059] The preparation method of the universal anticorrosive coating of water-oil primer is as follows: Stir water, water-based epoxy resin, graphene derivative, lithium-containing phosphate, glass sand, silane coupling agent, potassium silicate, magnesium powder, nanofiller, thickener, wetting agent and alkyl glycidyl ether at high speed of 800 r / min for 10 min; stir at low speed of 300 r / min for 10 min to obtain a mixed slurry of component A; The water-based epoxy curing agent and the ether solvent were mixed with the A component and stirred at 300 r / min for 15 minutes to obtain a universal anti-corrosion coating for water-based oil primer.

[0060] Example 1 A universal anticorrosive coating of water-oil primer, which consists of component A and component B in parts by weight, wherein the mass ratio of component A to component B is 4:1; The component A comprises: 40 parts of water, 35 parts of waterborne epoxy resin E51, 3 parts of graphene derivatives, 3 parts of lithium iron phosphate, 4 parts of glass sand, 2 parts of silane coupling agent KH550, 1 part of potassium silicate, 1 part of magnesium powder, 2 parts of nano-scale calcium carbonate, 1 part of thickener RM-8W, 2 parts of wetting agent PE100 and 1 part of C12-14 alkyl glycidyl ether; The B component is composed of 15 parts of cyclic aliphatic amine isophorone diamine curing agent and 2 parts of diethylene glycol monobutyl ether.

[0061] Example 2 A universal anticorrosive coating of water-oil primer, which consists of component A and component B in parts by weight, wherein the mass ratio of component A to component B is 4:1; The component A comprises: 50 parts of water, 40 parts of waterborne epoxy resin E51, 3 parts of graphene derivative, 3 parts of lithium iron phosphate, 4 parts of glass sand, 3 parts of silane coupling agent KH550, 2 parts of potassium silicate, 2 parts of magnesium powder, 3 parts of nano-silicon dioxide, 3 parts of thickener RM-8W, 3 parts of wetting agent PE100 and 2 parts of C12-14 alkyl glycidyl ether; The B component is composed of 18 parts of cyclic aliphatic amine isophorone diamine curing agent and 2 parts of diethylene glycol monobutyl ether.

[0062] Example 3 A universal anticorrosive coating of water-oil primer, which consists of component A and component B in parts by weight, wherein the mass ratio of component A to component B is 3:1; The component A comprises: 55 parts of water, 45 parts of waterborne epoxy resin E51, 4 parts of graphene derivative, 3 parts of lithium iron phosphate, 6 parts of glass sand, 3 parts of silane coupling agent KH550, 2 parts of potassium silicate, 2 parts of magnesium powder, 3 parts of nano-silicon dioxide, 2 parts of thickener RM-8W, 3 parts of wetting agent PE100 and 2 parts of C12-14 alkyl glycidyl ether; The B component is composed of 25 parts of cyclic aliphatic amine isophorone diamine curing agent and 3 parts of diethylene glycol monobutyl ether.

[0063] Comparative Example 1 An anticorrosive coating, comprising component A and component B, in weight proportion, wherein the mass ratio of component A to component B is 4:1; The component A is composed of: 40 parts of water, 35 parts of waterborne epoxy resin E51, 3 parts of lithium iron phosphate, 4 parts of glass sand, 2 parts of silane coupling agent KH550, 1 part of potassium silicate, 1 part of magnesium powder, 2 parts of nano-scale calcium carbonate, 1 part of thickener RM-8W, 2 parts of wetting agent PE100 and 1 part of C12-14 alkyl glycidyl ether; The B component is composed of 15 parts of cyclic aliphatic amine isophorone diamine curing agent and 2 parts of diethylene glycol monobutyl ether.

[0064] Comparative Example 2 An anticorrosive coating, comprising component A and component B, in weight proportion, wherein the mass ratio of component A to component B is 4:1; The component A comprises: 40 parts of water, 35 parts of waterborne epoxy resin E51, 3 parts of lithium iron phosphate, 3 parts of graphene, 4 parts of glass sand, 2 parts of silane coupling agent KH550, 1 part of potassium silicate, 1 part of magnesium powder, 2 parts of nano-scale calcium carbonate, 1 part of thickener RM-8W, 2 parts of wetting agent PE100 and 1 part of C12-14 alkyl glycidyl ether; The B component is composed of 15 parts of cyclic aliphatic amine isophorone diamine curing agent and 2 parts of diethylene glycol monobutyl ether.

[0065] Comparative Example 3 An anticorrosive coating, comprising component A and component B, in weight proportion, wherein the mass ratio of component A to component B is 4:1; The component A comprises: 40 parts of water, 35 parts of waterborne epoxy resin E51, 3 parts of graphene derivatives, 3 parts of lithium iron phosphate, 4 parts of glass sand, 2 parts of silane coupling agent KH550, 2 parts of nano-calcium carbonate, 1 part of thickener RM-8W, 2 parts of wetting agent PE100 and 1 part of C12-14 alkyl glycidyl ether; The B component is composed of 15 parts of cyclic aliphatic amine isophorone diamine curing agent and 2 parts of diethylene glycol monobutyl ether.

[0066] Comparative Example 4 A universal anticorrosive coating of water-oil primer, which consists of component A and component B in parts by weight, wherein the mass ratio of component A to component B is 4:1; The component A comprises: 40 parts of water, 35 parts of waterborne epoxy resin E51, 3 parts of graphene derivatives, 3 parts of lithium iron phosphate, 4 parts of glass sand, 2 parts of silane coupling agent KH550, 1 part of potassium silicate, 1 part of magnesium powder, 2 parts of nano-scale calcium carbonate, 1 part of thickener RM-8W and 2 parts of wetting agent PE100; The B component is composed of 15 parts of cyclic aliphatic amine isophorone diamine curing agent and 2 parts of diethylene glycol monobutyl ether.

[0067] Comparative Example 5 An anticorrosive coating, comprising component A and component B, in weight proportion, wherein the mass ratio of component A to component B is 4:1; The component A comprises: 40 parts of water, 35 parts of waterborne epoxy resin E51, 3 parts of graphene derivatives, 4 parts of glass sand, 2 parts of silane coupling agent KH550, 1 part of potassium silicate, 1 part of magnesium powder, 2 parts of nano-scale calcium carbonate, 1 part of thickener RM-8W, 2 parts of wetting agent PE100 and 1 part of C12-14 alkyl glycidyl ether; The B component is: 15 parts of cyclic aliphatic amine isophorone diamine curing agent and 2 parts of diethylene glycol monobutyl ether. Test Case A commercially available HW210P water-based acrylic anti-rust primer is coated on the stainless steel plate, and a water-based primer is obtained after curing; a commercially available GY-50 primer is coated on the stainless steel plate, and a solvent-based primer is obtained after curing; The anticorrosive coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 5 were sprayed on the surface of the water-based primer or the solvent-based primer, respectively, and the performance was tested after curing. The test results are shown in Table 1.

[0068] Table 1 Test results of coating properties of anticorrosive coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 5

[0069] In Table 1, the test method for high and low temperature thermal shock resistance is: the coated stainless steel substrate is kept at 550°C for 30 minutes, cooled in cold water, and then kept at 550°C for 30 minutes, and the test is repeated 100 times. Observe whether the coating has fallen off or cracked.

[0070] As can be seen from Table 1, the coating formed by the anticorrosive coating provided by the embodiment of the present invention on the surface of the water-based primer or the solvent-based primer has good corrosion resistance, adhesion and high and low temperature thermal shock resistance. However, the anticorrosive coating of Comparative Example 1 does not include sulfonic group-modified graphene, and the anticorrosive performance is reduced; although the anticorrosive coating of Comparative Example 2 adds graphene, due to the poor dispersion of graphene in the coating, the conductivity and barrier properties of graphene cannot be fully utilized, resulting in a decrease in the anticorrosive performance of the cured paint film.

[0071] It can be seen from the results of Comparative Example 3 that, since potassium silicate and magnesium powder are not added, the silane coupling agent can only play the role of a surfactant but cannot form a magnesium silicate spatial network structure, which leads to a decrease in the strength and toughness of the paint film and a decrease in corrosion resistance.

[0072] It can be seen from the results of Comparative Example 4 that the adhesion between the anti-corrosion coating and the solvent-based primer is reduced due to the absence of the addition of alkyl glycidyl ether.

[0073] It can be seen from the results of Comparative Example 5 that the anti-corrosion performance of the paint film is reduced due to the absence of the addition of lithium iron phosphate.

[0074] It can be seen from the above results that the anticorrosive coating provided by the present invention has excellent adhesion and adaptability on the surface of water-based anticorrosive primer or solvent-based anticorrosive primer. This is because the present invention adds graphene derivatives, lithium-containing phosphates, silane coupling agents, potassium silicate, magnesium powder and alkyl glycidyl ether, etc., and the above factors work together to improve the adhesion, corrosion resistance and high and low temperature impact resistance of the paint film, so that the coating of the present invention has good compatibility with both solvent-based anticorrosive primers and water-based anticorrosive primers.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A universal anticorrosive coating for water-oil primer, characterized in that: The composition comprises component A and component B, wherein the mass ratio of component A to component B is 1 to 5:

1. The component A comprises: 40-60 parts of water, 30-50 parts of waterborne epoxy resin, 1-5 parts of graphene derivatives, 1-5 parts of lithium-containing phosphate, 3-10 parts of glass sand, 1-3 parts of silane coupling agent, 1-3 parts of potassium silicate, 1-2 parts of magnesium powder, 1-5 parts of nanofiller, 1-3 parts of thickener, 1-5 parts of wetting agent and 1-3 parts of alkyl glycidyl ether; The B component includes: 15-30 parts of a water-based epoxy curing agent and 1-5 parts of an ether solvent.

2. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The graphene derivative is sulfonyl-modified graphene.

3. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The lithium-containing phosphate includes lithium iron phosphate and / or lithium manganese phosphate.

4. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The particle size of the glass sand is 400-500 meshes.

5. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The silane coupling agent includes one or more of KH550, KH560, KH570 and KH602.

6. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The nano filler includes one or more of nano calcium carbonate, nano silicon dioxide and nano titanium dioxide.

7. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The thickener is a polyurethane associative thickener.

8. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The alkyl glycidyl ether is C12-14 alkyl glycidyl ether.

9. The universal anticorrosive coating of water-oil primer according to claim 1, characterized in that: The ether solvent includes one or more of diethylene glycol monobutyl ether, octanol phenyl ether, polypropylene ether and octanol glycol ether.

10. The method for preparing the universal anticorrosive coating of water-oil primer according to any one of claims 1 to 9, characterized in that: include: Mixing water, water-based epoxy resin, graphene derivative, lithium-containing phosphate, glass sand, silane coupling agent, potassium silicate, magnesium powder, nanofiller, thickener, wetting agent and alkyl glycidyl ether to obtain a mixed slurry of component A; The water-based epoxy curing agent and the ether solvent are mixed with the A component mixed slurry to obtain a water-based oil primer universal anti-corrosion coating.

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