CN114456652A - Water-based anticorrosive paint and preparation method and application thereof - Google Patents
Water-based anticorrosive paint and preparation method and application thereof Download PDFInfo
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- CN114456652A CN114456652A CN202210249949.XA CN202210249949A CN114456652A CN 114456652 A CN114456652 A CN 114456652A CN 202210249949 A CN202210249949 A CN 202210249949A CN 114456652 A CN114456652 A CN 114456652A
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- anticorrosive paint
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000003973 paint Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000000576 coating method Methods 0.000 claims abstract description 91
- 239000011248 coating agent Substances 0.000 claims abstract description 68
- 229920005989 resin Polymers 0.000 claims abstract description 42
- 239000011347 resin Substances 0.000 claims abstract description 42
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims abstract description 40
- 239000005033 polyvinylidene chloride Substances 0.000 claims abstract description 40
- 239000000839 emulsion Substances 0.000 claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000000049 pigment Substances 0.000 claims abstract description 26
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 23
- 239000004640 Melamine resin Substances 0.000 claims abstract description 22
- 239000000945 filler Substances 0.000 claims abstract description 19
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000006184 cosolvent Substances 0.000 claims abstract description 6
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- 238000001723 curing Methods 0.000 claims description 25
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 19
- 229920003180 amino resin Polymers 0.000 claims description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000006266 etherification reaction Methods 0.000 claims description 14
- 239000006185 dispersion Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 239000004094 surface-active agent Substances 0.000 claims description 8
- 239000004408 titanium dioxide Substances 0.000 claims description 8
- 239000002270 dispersing agent Substances 0.000 claims description 7
- 239000003507 refrigerant Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000009736 wetting Methods 0.000 claims description 7
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 claims description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002518 antifoaming agent Substances 0.000 claims description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000002562 thickening agent Substances 0.000 claims description 6
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- 150000003863 ammonium salts Chemical class 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 239000012860 organic pigment Substances 0.000 claims description 4
- 239000011253 protective coating Substances 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 229920001897 terpolymer Polymers 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical group ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 3
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 3
- 229920001400 block copolymer Polymers 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000012855 volatile organic compound Substances 0.000 abstract description 13
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 150000003839 salts Chemical class 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 21
- 238000000034 method Methods 0.000 description 10
- 238000001035 drying Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000007590 electrostatic spraying Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229920000180 alkyd Polymers 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229920003270 Cymel® Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229920003275 CYMEL® 325 Polymers 0.000 description 1
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000012216 bentonite Nutrition 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 238000013035 low temperature curing Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- AZIQALWHRUQPHV-UHFFFAOYSA-N prop-2-eneperoxoic acid Chemical compound OOC(=O)C=C AZIQALWHRUQPHV-UHFFFAOYSA-N 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
Classifications
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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
- C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/04—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C09D127/08—Homopolymers or copolymers of vinylidene chloride
-
- 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
- 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
- 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
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The application relates to the technical field of coatings, and particularly discloses a water-based anticorrosive coating as well as a preparation method and application thereof. The water-based anticorrosive paint is a two-component paint consisting of a component A and a component B; wherein, the component A is prepared by the following raw materials, by weight, 40-70 parts of aqueous PVDC resin emulsion, 20-40 parts of pigment and filler, 0.5-10 parts of auxiliary agent, 1-5 parts of cosolvent and 1-10 parts of deionized water; the component B is prepared from the following raw materials, by weight, 60-80 parts of melamine resin curing agent and 20-40 parts of deionized water. The anticorrosive coating is environment-friendly and pollution-free in raw materials, low in VOC (volatile organic compounds) emission in the coating process, capable of meeting the field coating process of low-temperature baking, high in coating adhesion and pencil hardness, and excellent in water resistance and salt spray resistance, and is coated on the surface of a steel cylinder.
Description
Technical Field
The application relates to the technical field of coatings, in particular to a water-based anticorrosive coating and a preparation method and application thereof.
Background
At present, solvent-based paint products such as alkyd polyurethane paint and acrylic polyurethane paint are generally selected as the anticorrosive paint for the surface of the refrigerant storage cylinder. In order to improve the coating curing speed, the steel cylinder is coated by adopting the processes of movable guide rail electrostatic spraying and low-temperature (80-90 ℃) baking for 20-30min in the steel cylinder coating processing process, in order to meet the requirement of an electrostatic spraying production line of a processing plant, a large amount of diluent is required to be added when the coating is used, the discharge amount of VOC (more than 800 g/L) in the use of a coating product is increased, the discharge of VOC is more easily aggravated particularly in the baking process of coating preparation, great harm is caused to workers in the plant area and the surrounding ecological environment, energy is not saved, the environment is protected, and the steel cylinder can be gradually eliminated by the market.
Therefore, it is usually necessary to select a water-based anticorrosive paint suitable for electrostatic spraying of a movable guide rail, such as a water-based alkyd amino paint and a water-based acrylic amino paint, but neither of the above two water-based paints can meet the on-site coating process of low-temperature baking, and the problem of no dryness and stickiness of the coating film is common, so that it is necessary to develop a paint suitable for the on-site coating process of low-temperature baking and having good film forming property.
Disclosure of Invention
In order to provide a coating which can meet the field coating process of low-temperature baking and has good film-forming performance, the application provides a water-based anticorrosive coating and a preparation method and application thereof.
The application provides a water-based anticorrosive paint and a preparation method and application thereof, and adopts the following technical scheme:
in a first aspect, the application provides a water-based anticorrosive paint, which adopts the following technical scheme:
a water-based anticorrosive paint is a two-component paint consisting of a component A and a component B;
wherein, the component A is prepared from the following raw materials, by weight, 40-70 parts of aqueous PVDC resin emulsion, 20-40 parts of pigment and filler, 0.5-10 parts of auxiliary agent, 1-5 parts of cosolvent and 1-10 parts of deionized water;
the component B is prepared from the following raw materials, by weight, 60-80 parts of melamine resin curing agent and 20-40 parts of deionized water.
By adopting the technical scheme, the aqueous PVDC resin emulsion in the component A contains hydroxyl and carboxyl functional groups, and can generate a crosslinking reaction with amino functional groups contained in the melamine resin curing agent at a certain temperature to form a coating film with high hardness.
The waterborne PVDC resin belongs to high molecular weight resin, the higher the molecular weight of the polymer is, the faster the drying speed is, and therefore, the film-forming property of the waterborne anticorrosive paint prepared from the waterborne PVDC resin emulsion after low-temperature baking is very excellent.
The melamine resin curing agent in the component B adopted in the water-based anticorrosive paint has high reactivity in an acid environment, and the water-based PVDC resin emulsion belongs to acid resin and can provide a sufficient reaction environment for the melamine resin curing agent, so that the cross-linking reaction of the water-based PVDC resin emulsion in the component A and the melamine resin curing agent in the component B can be realized by baking for 20-30min at the low temperature of 80-90 ℃, and the anticorrosive coating process requirement of a refrigerant storage steel cylinder can be completely met.
The inventor considers that the structure of the water-based PVDC resin contains a small amount of reactive functional groups such as hydroxyl and carboxyl in the prior art, and the water-based PVDC resin hardly reacts with a melamine resin crosslinking agent. However, it has been confirmed through experiments that the aqueous PVDC resin and the specific melamine resin can indeed undergo a crosslinking reaction, which can occur even at room temperature.
Preferably, the aqueous PVDC resin emulsion is a terpolymer of VC (vinylchloride)/VDC (vinylidene chloride)/MMA (acrylic acid).
By adopting the technical scheme, the PVDC resin emulsion adopted in the application is a terpolymer of VC (chloroethylene)/VDC (vinylidene chloride)/MMA (acrylic acid), the terpolymer has a special molecular structure, can form a compact paint film like a plastic semi-film, has extremely low transmittance to water vapor, oxygen, carbon dioxide and the like, has good adhesive force on various substrates, and has hardness and flexibility.
Preferably, the addition amount of the aqueous PVDC resin emulsion in the component A is 50-60 parts.
In a specific embodiment, the addition amount of the aqueous PVDC resin emulsion in the a component is 40 parts, 50 parts, 60 parts, 70 parts.
In some specific embodiments, the amount of the aqueous PVDC resin emulsion added in the a component is 40 to 50 parts, 40 to 60 parts, 50 to 70 parts, 60 to 70 parts.
Preferably, the melamine resin curing agent is methylated amino resin.
By adopting the technical scheme, the melamine resin curing agent has great chemical activity, strong bonding strength, strong water resistance, high thermal stability, strong low-temperature curing capability, good wear resistance, simple operation and easy realization, and can finish the preparation of the coating without adding extra curing agent.
Preferably, the etherification degree of the methylated amino resin is 30 to 90%.
Preferably, the etherification degree of the methylated amino resin is 60 to 90%.
Preferably, the etherification degree of the methylated amino resin is 30 to 60%.
In a specific embodiment, the degree of etherification of the methylated amino resin is 30%.
In a specific embodiment, the degree of etherification of the methylated amino resin is 60%.
In a specific embodiment, the degree of etherification of the methylated amino resin is 90%.
By adopting the technical scheme, the methylated amino resins with different etherification degrees are selected as the curing agent, so that the cross-linking curing reaction can be better completed by the aqueous PVDC resin emulsion and the methylated amino resin.
Preferably, the pigment and filler comprises one or a mixture of more of titanium dioxide, organic pigment, mica iron oxide, carbon black, zinc phosphate, barium sulfate, talcum powder and mica powder.
By adopting the technical scheme, the titanium dioxide is an important inorganic chemical pigment and has important application in the coating, the titanium dioxide pigment has important influence on the contrast ratio performance of the coating, the covering performance of the coating is the most direct and most key index for reflecting the white pigment performance, the stronger the covering power of the coating is on the premise that other components of the coating are the same, the stronger the covering performance of the pigment is, meanwhile, the titanium dioxide has very strong absorption and shielding performance on ultraviolet light, the performance index which is the same as or similar to that of the titanium dioxide can be obtained by using the titanium dioxide pigment in the coating system, and the titanium dioxide pigment is widely applied to the coating system so as to improve the performance of the coating and greatly reduce the use cost of the material.
The organic pigment is an insoluble organic substance, and is added to the substrate in a highly dispersed state to color the substrate, and is insoluble in neither the medium used nor the substrate to be colored, so that the organic pigment has a higher degree of integrity in dispersion.
The mica iron oxide has good chemical stability, strong sunlight reflection, good antirust function, strong adhesive force, no toxicity and no harm, and can slow down the aging of a paint film.
Zinc phosphate is often used in the production of water-soluble coatings, and barium sulfate is used in water-based coatings, so that the water-based coatings have good compactness and permeability resistance, and the water-based coatings have excellent permeability resistance.
Preferably, the auxiliary agent comprises one or a mixture of a wetting dispersant, a surfactant, a defoaming agent, an anti-flash rust agent and a thickening agent.
Preferably, the wetting dispersant comprises one or a mixture of more of an ammonium salt solution of an acrylate copolymer, an ammonium salt solution of an acrylate copolymer and a high molecular weight block copolymer solution containing pigment affinity groups.
Preferably, the surfactant comprises one or a mixture of several of ethylene oxide copolymer, propylene oxide copolymer and nonyl phenol condensate.
Preferably, the defoaming agent comprises one or a mixture of mineral oil and siloxane. Preferably, the flash rust inhibitor comprises one or a mixture of sodium nitrite aqueous solution and organic amine aqueous solution.
Through adopting above-mentioned technical scheme, the anticorrosive effect of waterborne anticorrosive coating can further be increased in the addition of anti-flash rust agent, and anti-flash rust agent can promote the chemical activity of organic matter for the solidification between melamine curing agent and other components is more high-efficient.
Preferably, the thickening agent comprises one or a mixture of several of polyurethanes, celluloses, bentonites and fumed silica.
In a second aspect, the application provides a preparation method of a water-based anticorrosive paint, which adopts the following technical scheme:
a preparation method of a water-based anticorrosive paint comprises the following steps:
(1) the preparation method of the component A comprises the following steps: dispersing pigment and filler into deionized water added with wetting dispersant and surfactant to obtain pigment and filler dispersion water slurry; adding the aqueous PVDC resin emulsion, the cosolvent, the defoaming agent, the flash rust inhibitor and the thickening agent into the pigment and filler dispersion water slurry, stirring for 10-15min, and filtering to obtain a component A;
(2) the preparation method of the component B comprises the following steps: adding melamine resin curing agent into deionized water, stirring for 15-20min, and filtering to obtain component B.
In a specific embodiment, the stirring time in the preparation process of the component A can be 13min, 10-12min and 14-15 min.
In a specific embodiment, in the preparation procedure of the component B, the stirring time can be 17min, 15-16min and 18-20 min.
By adopting the technical scheme, the surfactant is completely dissolved in the water in advance, then the pigment filler is added, and the surfactant solution is clear, water white and free of particles before the pigment filler is dispersed.
Due to the shear instability of the aqueous PVDC resin, the pigment and filler cannot be dispersed in the resin during the preparation process of the aqueous PVDC anticorrosive paint, and the aqueous PVDC resin emulsion must be always added into the grinding material (pigment and filler dispersion water slurry) under the condition of low-speed stirring so as to ensure that the aqueous PVDC resin emulsion is uniformly stable in the paint.
When the aqueous PVDC resin is added into a grinding material (pigment and filler dispersion water slurry), the pH value of the aqueous PVDC resin must be pre-adjusted to 3.5-4.5 by adopting ammonia water or diluted tertiary amine solution, otherwise, the emulsion breaking phenomenon of the aqueous coating can occur.
In a third aspect, the application of the water-based anticorrosive paint is to coat the surface of a refrigerant storage bottle.
The water-based anticorrosive paint is coated on a steel cylinder, and the paint can be suitable for the field coating process of movable guide rail electrostatic spraying and low-temperature baking in the coating process.
Preferably, in the coating process, the weight ratio of the component A to the component B is 100: (7-12), and baking for 20-30min at the temperature of 80-90 ℃ for coating.
By adopting the technical scheme, the specific aqueous PVDC resin emulsion and the melamine resin curing agent are selected for reaction, so that the crosslinking and curing effects of the aqueous PVDC resin emulsion and the melamine resin curing agent are realized.
In a particular embodiment, the weight ratio of the a component and the B component is 100: 8. 100, and (2) a step of: 10. 100, and (2) a step of: 12, uniformly mixing and coating.
In one embodiment, the baking temperature may also be 85 ℃, 80-84 ℃, 86-90 ℃;
in a specific embodiment, the baking time can be 25min, 20-24min, 26-30 min.
By adopting the technical scheme, the proportion among the components, the baking temperature and the baking time are further regulated and controlled, so that the synergistic effect among the components achieves the best effect.
In summary, the present application has the following beneficial effects:
1. this application adopts waterborne PVDC resin emulsion and specific melamine resin preparation to obtain waterborne PVDC anticorrosive coating, and solvent content is lower among the anticorrosive coating, only needs to add water as the diluent during the application for VOC emission is less than or equal to 120g/L in the coating process, and the VOC emission is low, and green reduces and causes harm to painting workshop workman and peripheral ecological environment.
2. The coating film prepared by the anticorrosive coating has hardness close to that of a solvent-based product, is excellent in water resistance and salt spray resistance, strong in adhesive force and long in service life, and can achieve an excellent protection effect on a substrate.
3. The coating film prepared by the method does not need to be divided into the primer and the finish, only a single protective coating needs to be prepared during coating, and the operation process flow is simple.
4. The preparation method has the advantages of simple process flow and few processing steps, can realize rapid curing of the coating film at a lower temperature, reduces the production cost, meets the requirements of the anticorrosion field, can replace the existing solvent-based coating to be used on the surface of the refrigerant storage steel cylinder, and has wide application prospect.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
The names, manufacturers, models and performance parameters of the various raw materials used in the examples and comparative examples of the present application are recorded in table 1.
Table 1 examples and raw material names, manufacturers, models and performance parameters used in the comparative examples
Examples
Examples 1 to 3
Examples 1-3 each provide an aqueous corrosion protective coating. The preparation method of the water-based anticorrosive paint comprises the following specific steps:
(1) the preparation method of the component A comprises the following steps: dispersing pigment and filler into deionized water added with wetting dispersant and surfactant to obtain pigment and filler dispersion water slurry; adding the aqueous PVDC resin emulsion, the cosolvent, the defoaming agent, the flash rust inhibitor and the thickening agent into the pigment and filler dispersion water slurry, stirring for 13min, and filtering to obtain a component A;
(2) the preparation method of the component B comprises the following steps: and adding a melamine resin curing agent into deionized water, stirring for 18min, and filtering to obtain a component B.
The amounts of the components added in the above examples are shown in table 2, and the above examples are different in that: the component B contains melamine resin curing agent. The method comprises the following specific steps:
in the embodiment 1, the A component is aqueous PVDC resin emulsion with Zhejiang Juhua group model number QL-705M, the melamine resin curing agent in the B component is methylated amino resin with etherification degree of 90%, the model numbers are as follows: CYMEL 303.
In the embodiment 2, the A component is aqueous PVDC resin emulsion with Zhejiang Juhua group model number QL-705M, the melamine resin curing agent in the B component is methylated amino resin with etherification degree of 60%, the model numbers are as follows: CYMEL 325.
In example 3, the component a is aqueous PVDC resin emulsion of zhejiang jumbo group type QL-705M, and the melamine resin curing agent in the component B is methylated amino resin with an etherification degree of 30%, the types being: CYMEL 385.
Examples 4 to 6
Examples 4-6 differ from example 3 in that: the proportion of each component in the component A and the component B. The amounts of the components added in the above examples are shown in Table 2.
Examples 7 to 9
Examples 7-9 differ from example 3 in that: the amount of aqueous PVDC resin emulsion added. The amounts of the components added in the above examples are shown in Table 2.
TABLE 2 amounts of components of the aqueous corrosion protective coatings of examples 1-9
Comparative example
Comparative example 1
This comparative example differs from example 3 in that: the component A is selected from water-based alkyd emulsion with the model of ETERKYD W3630.
Comparative example 2
This comparative example differs from example 3 in that: the component A is selected from water-based hydroxy acrylic emulsion with the model of DB 3716.
Comparative example 3
This comparative example differs from example 3 in that: the component A is selected from an aqueous hydroxyl acrylate secondary dispersion with the model of DB 3642.
Comparative examples 4 to 5
Comparative examples 4 to 5 differ from example 3 in that: the amount of aqueous PVDC resin emulsion added.
The amounts of the components added in the above comparative examples are shown in Table 3.
TABLE 3 amount of each component in aqueous anticorrosive coatings in example 3 and comparative examples 1 to 5
Performance detection
The aqueous anticorrosive coatings prepared in examples 1 to 9 and comparative examples 1 to 5 were applied to a steel cylinder for refrigerant storage. When the waterborne anticorrosive paint is coated, the component A and the component B are mixed according to the weight ratio of 100: 10, baking at 85 ℃ for 25min during coating, forming a refrigerant storage steel cylinder product containing a coating film with the thickness of 25-35 mu m, and detecting the fineness of the coating, the discharge amount of VOC (volatile organic compounds) in the coating baking process, the drying time of the coating and the performance of the formed coating.
The performance test indexes and test standards are shown in table 4.
TABLE 4 Performance test indexes and test standards
The aqueous anticorrosive coatings and coating films prepared in examples 1 to 9 and comparative examples 1 to 5 were subjected to performance tests according to the above test methods, and the test results are shown in tables 5 and 6.
TABLE 5 EXAMPLES 1-9-results of film coating Performance test
TABLE 6 comparative examples 1 to 5-results of film property test
As can be seen from the combination of tables 5 and 6, the fineness of the coatings prepared in examples 1 to 9 is 30 to 40 μm and less than or equal to 40 μm, which meets the requirements for the fineness of the coatings in the national standard. It can be seen from comparison of examples 3, 7-9 and 4-5, that when the addition amount of the aqueous PVDC resin emulsion is controlled within the range of 40-70 parts, the VOC emission amount of the prepared coating in the coating process is 70-120g/L, and the VOC emission amount is small, so that the aqueous anticorrosive coating prepared in the application has the advantages of low VOC emission amount, environmental protection and environmental pollution reduction.
As can be seen by comparing examples 1-3 and comparative examples 1-3, examples 1-3 of the present application use aqueous PVDC resin emulsions, while comparative examples 1-3 select conventional resin emulsions. The drying time, VOC emission and water vapor transmission rate of the coating films after the coating provided by the examples 1-3 are all better than those of the coating provided by the comparative examples 1-3, and other properties of the coating films after the coating of each example are also better than those of the coating films after the coating of the comparative examples 1-3. Thus, the present application selects aqueous PVDC resin emulsions.
As can be seen from comparison of examples 1 to 3, the drying time and the water vapor transmission rate of example 3 are relatively short, which indicates that the drying time, the water vapor transmission rate and other properties of the coated film after coating can be effectively reduced by selecting the methylated amino resin with the etherification degree of 30% for the aqueous PVDC resin emulsion. Therefore, the methylated amino resin with the etherification degree of 30 percent is selected.
In the application example 3, the coating fineness is 35 μm and is small; the drying time of the coating film is less than 20min, the drying time is short, the film forming speed is high, and the VOC emission in the coating process is small, so that the coating prepared in the application is a green and environment-friendly water-based coating with little environmental pollution.
The coating prepared by the method is coated on a steel cylinder to form a coating film, the adhesion force of the coating film is 0, the adhesion force is excellent, and the coating film and the steel cylinder have good adhesion capability; the surface of the coating does not blister, fall off or change color slightly, which indicates that the coating has good water resistance; the surface of the coating film at the scribed line of the coating film is slightly rusted, and the surface of the coating film at the unscored line has no phenomena of bubbling, rusting, cracking, peeling and the like, which indicates that the coating film has good salt spray resistance; the water vapor transmission rate of the coating film is less than 13 g/(m)2D), the water vapor transmission rate is low, which indicates that the coating has good compactness and extremely low transmission rate for water vapor, oxygen, carbon dioxide and the like.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The water-based anticorrosive paint is characterized by being a two-component paint consisting of a component A and a component B;
wherein, the component A is prepared from the following raw materials, by weight, 40-70 parts of aqueous PVDC resin emulsion, 20-40 parts of pigment and filler, 0.5-10 parts of auxiliary agent, 1-5 parts of cosolvent and 1-10 parts of deionized water;
the component B is prepared from the following raw materials, by weight, 60-80 parts of melamine resin curing agent and 20-40 parts of deionized water.
2. The water-based anticorrosive paint according to claim 1, characterized in that: the aqueous PVDC resin emulsion is a terpolymer of VC (chloroethylene)/VDC (vinylidene chloride)/MMA (acrylic acid).
3. The water-based anticorrosive paint according to claim 1, characterized in that: the melamine resin curing agent is methylated amino resin.
4. The water-based anticorrosive paint according to claim 3, characterized in that: the etherification degree of the methylated amino resin is 30-90%.
5. The water-based anticorrosive paint according to claim 4, characterized in that: the etherification degree of the methylated amino resin is 30-60%.
6. The water-based anticorrosive paint according to claim 1, characterized in that: the pigment and filler is one or a mixture of more of titanium dioxide, organic pigment, mica iron oxide, carbon black, zinc phosphate, barium sulfate, talcum powder and mica powder.
7. The water-based anticorrosive paint according to claim 1, characterized in that: the auxiliary agent is one or a mixture of more of a wetting dispersant, a surfactant, a defoaming agent, an anti-flash rust agent and a thickening agent.
8. The water-based anticorrosive paint according to claim 7, characterized in that: the wetting dispersant is one or a mixture of more of an ammonium salt solution of an acrylate copolymer, an ammonium salt solution of the acrylate copolymer and a high molecular weight block copolymer solution containing pigment affinity groups.
9. The preparation method of the water-based anticorrosive paint according to claim 7, characterized by comprising the following steps:
(1) the preparation method of the component A comprises the following steps:
dispersing pigment and filler into deionized water added with wetting dispersant and surfactant to obtain pigment and filler dispersion water slurry; adding the aqueous PVDC resin emulsion, the cosolvent, the defoaming agent, the flash rust inhibitor and the thickening agent into the pigment and filler dispersion water slurry, stirring for 10-15min, and filtering to obtain a component A;
(2) the preparation method of the component B comprises the following steps:
adding melamine resin curing agent into deionized water, stirring for 15-20min, and filtering to obtain component B.
10. Use of the aqueous corrosion protective coating according to any of claims 1 to 8 for coating the surface of a refrigerant storage bottle.
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