CN114958141A - Single-component water-based epoxy primer for curtain coating and preparation method thereof - Google Patents
Single-component water-based epoxy primer for curtain coating and preparation method thereof Download PDFInfo
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- CN114958141A CN114958141A CN202210611349.3A CN202210611349A CN114958141A CN 114958141 A CN114958141 A CN 114958141A CN 202210611349 A CN202210611349 A CN 202210611349A CN 114958141 A CN114958141 A CN 114958141A
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- 239000004593 Epoxy Substances 0.000 title claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000007766 curtain coating Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 19
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003822 epoxy resin Substances 0.000 claims abstract description 29
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 29
- 239000000839 emulsion Substances 0.000 claims abstract description 28
- 239000002562 thickening agent Substances 0.000 claims abstract description 23
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 18
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 17
- 239000008367 deionised water Substances 0.000 claims abstract description 15
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000080 wetting agent Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 9
- 238000004132 cross linking Methods 0.000 claims abstract description 7
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 24
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 24
- 239000000049 pigment Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 23
- 239000006185 dispersion Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 239000003112 inhibitor Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 3
- 229910052623 talc Inorganic materials 0.000 claims description 3
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 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
- 238000001035 drying Methods 0.000 abstract description 13
- 238000010276 construction Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 239000003795 chemical substances by application Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 23
- 150000003839 salts Chemical class 0.000 description 15
- 239000007921 spray Substances 0.000 description 9
- 238000005507 spraying Methods 0.000 description 8
- 239000003973 paint Substances 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 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 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000012855 volatile organic compound Substances 0.000 description 3
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 description 2
- CUDYYMUUJHLCGZ-UHFFFAOYSA-N 2-(2-methoxypropoxy)propan-1-ol Chemical compound COC(C)COC(C)CO CUDYYMUUJHLCGZ-UHFFFAOYSA-N 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000012222 talc Nutrition 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- -1 5 parts Chemical compound 0.000 description 1
- FVCSARBUZVPSQF-UHFFFAOYSA-N 5-(2,4-dioxooxolan-3-yl)-7-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C(C(OC2=O)=O)C2C(C)=CC1C1C(=O)COC1=O FVCSARBUZVPSQF-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a single-component water-based epoxy primer for curtain coating and a preparation method thereof. The single-component water-based epoxy primer comprises the following raw materials in parts by weight: 50-60 parts of epoxy resin emulsion, 8-10 parts of titanium dioxide, 8-13 parts of filler, 1-5 parts of film-forming additive, 0.5-1 part of thickening agent, 0.5-1 part of dispersing agent, 0.5-1 part of defoaming agent, 0.2-0.5 part of wetting agent and 10-20 parts of deionized water; wherein the epoxy resin emulsion is a single-component self-crosslinking epoxy resin emulsion. The single-component water-based epoxy primer for curtain coating can be self-dried at normal temperature and can also be baked at high temperature; the single-component self-crosslinking epoxy resin emulsion does not need to be added with a curing agent, and the problem of construction pot life does not need to be considered. The single-component water-based epoxy primer disclosed by the invention is good in corrosion resistance, high in hardness, high in drying speed and good in defoaming performance, can be used for a long time in a circulating state, and is very suitable for a curtain coating process.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a single-component water-based epoxy primer for curtain coating and a preparation method thereof.
Background
The product for curtain coating needs low construction viscosity and excellent fluidity and defoaming property, and the coating needs to be recycled in the curtain coating process, so that the product is required to have a long construction working life. The primer for curtain coating at present mainly comprises an oily two-component epoxy primer, a water-based two-component epoxy primer and a one-component water-based paint, wherein the oily two-component epoxy primer has high VOCs content, and a large amount of organic solvent is required to be added for dilution during curtain coating, so that increasingly strict environmental protection requirements cannot be met; after the curing agent is added into the water-based two-component epoxy primer, the construction working life is generally only 3-6 hours, the water-based two-component epoxy primer cannot be used after exceeding the construction working life, and the long-time recycling of the prepared coating cannot be met; the traditional one-component water-based paint such as a one-component acrylic paint has poor corrosion resistance (salt spray resistance test is less than 48H), hardness and strength (hardness is less than B); the single-component alkyd paint has the advantages of low drying speed (surface drying time is more than 50min), low hardness rise and poor defoaming property.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a single-component water-based epoxy primer for curtain coating and a preparation method thereof, which are used for solving the problems of the primer on the market at present.
In order to achieve the above purpose, the invention provides the following technical scheme:
the single-component water-based epoxy primer comprises the following raw materials in parts by weight:
50-60 parts of epoxy resin emulsion, 8-10 parts of titanium dioxide, 8-13 parts of filler, 1-5 parts of film-forming additive, 0.5-1 part of thickening agent, 0.5-1 part of dispersing agent, 0.5-1 part of defoaming agent, 0.2-0.5 part of wetting agent and 10-20 parts of deionized water; wherein the epoxy resin emulsion is a single-component self-crosslinking epoxy resin emulsion.
Optionally, the thickener is a polyurethane associative thickener.
Optionally, the filler comprises, in parts by weight, 5-8 parts barium sulfate and 3-5 parts talc.
Optionally, the dispersion fineness of the barium sulfate is not more than 20 μm.
Optionally, the one-component waterborne epoxy primer further comprises, in parts by weight: 5-8 parts of an antirust pigment.
Optionally, the antirust pigment is one or a mixture of zinc phosphate and aluminum tripolyphosphate; the dispersion fineness of the antirust pigment is not more than 20 mu m.
Optionally, the one-component waterborne epoxy primer further comprises, in parts by weight: 0.5-1 part of flash rust inhibitor.
The invention also provides a preparation method of the single-component water-based epoxy primer for curtain coating, which comprises the following steps:
step one, mixing deionized water, a dispersing agent, a defoaming agent, titanium dioxide and a filler in parts by weight to obtain a first mixture;
and step two, stirring the first mixture, sequentially adding the epoxy resin emulsion, the film-forming aid, the wetting agent and the thickening agent according to the parts by weight, and continuously stirring and uniformly mixing to obtain the single-component waterborne epoxy primer.
Optionally, the step one is specifically: adding deionized water, a dispersing agent, a defoaming agent, titanium dioxide and a filler into a dispersion kettle according to the parts by weight, and dispersing at a dispersion speed of more than 2000rpm until the fineness is less than 30 micrometers to obtain a first mixture; in the second step, the stirring speed for stirring the first mixture is 500-800 rpm.
Optionally, in the first step, the first mixture further comprises an anti-rust pigment; in the second step, before adding the thickening agent according to the parts by weight, the method further comprises the following steps: adding the flash rust inhibitor according to the weight part.
Has the advantages that:
the single-component water-based epoxy primer for curtain coating can be self-dried at normal temperature and can also be baked at high temperature. The single-component self-crosslinking epoxy resin emulsion does not need to be added with a curing agent, and the problem of construction pot life does not need to be considered. The single-component water-based epoxy primer disclosed by the invention is diluted by using tap water, the VOCs content in a construction state is lower than that of an oily double-component epoxy primer, the corrosion resistance is good (salt spray resistance is more than 200H), the hardness is high (more than or equal to H), the drying speed is high (surface drying is less than 30min), the defoaming performance is good, and the single-component water-based epoxy primer can be used for a long time in a circulating state and is very suitable for a spray coating process.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Aiming at the problems of the primer on the market at present, the invention provides a single-component water-based epoxy primer for curtain coating. The single-component water-based epoxy primer for curtain coating can be self-dried at normal temperature and can also be baked at high temperature. The single-component self-crosslinking epoxy resin emulsion does not need to be added with a curing agent, and the problem of construction pot life does not need to be considered. The single-component water-based epoxy primer disclosed by the invention is diluted by using tap water, the VOCs content is about 1/20 of that of an oily double-component epoxy primer in a construction state, the single-component water-based epoxy primer has the advantages of good corrosion resistance (salt spray resistance is more than 200H), high hardness (more than or equal to H), high drying speed (surface drying is less than 30min), good defoaming performance and suitability for a spray coating process.
The single-component water-based epoxy primer for curtain coating comprises the following raw materials in parts by weight:
50-60 parts (such as 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts and the interval value between any two endpoint values) of epoxy resin emulsion, 8-10 parts (such as 8 parts, 9 parts, 10 parts and the interval value between any two endpoint values) of titanium dioxide, 8-13 parts (such as 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts and the interval value between any two endpoint values) of filler, 1-5 parts (such as 1 part, 2 parts, 3 parts, 4 parts, 5 parts and the interval value between any two endpoint values) of film-forming additive, 0.5-1 part (such as 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part and the interval value between any two endpoint values) of thickener, 0.5-1 part (such as 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part and the interval value between any two endpoint values), and 0.5-1 part (such as 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part and the interval value between any two endpoint value), 0.5-1 part (such as 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, and the interval between any two endpoints) of a defoaming agent, 0.2-0.5 part (such as 0.2 part, 0.3 part, 0.4 part, 0.5 part, and the interval between any two endpoints) of a wetting agent, and 10-20 parts (such as 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, and the interval between any two endpoints) of deionized water.
The epoxy resin emulsion is a single-component self-crosslinking epoxy resin emulsion, does not need to be added with a curing agent, can be self-crosslinked to form a film, and can be baked at normal temperature or high temperature to form a film. The epoxy resin emulsion can be selected from DIC Diegon Epiclon H-502-42W modified macromolecule type waterborne epoxy resin. If the amount of the epoxy resin emulsion is too large (more than 60 parts), the cost is high, and if the amount of the epoxy resin emulsion is too small (less than 50 parts), the adhesion and the salt spray resistance are deteriorated; titanium dioxide is used as a pigment, and if the using amount of the titanium dioxide is too large, the cost is high, and if the using amount of the titanium dioxide is too small, the covering power is poor; when the amount of the film-forming assistant is too large, the drying rate becomes slow, and when it is too small, the finally formed paint film tends to crack.
In the embodiment of the invention, the film forming assistant can be one or a mixture of more of dipropylene glycol butyl ether (DPnB), dipropylene glycol methyl ether (DPM) and ethylene glycol butyl ether (BCS).
In a specific embodiment of the invention, the thickener is a polyurethane associative thickener. The polyurethane associated thickener has a high thickening effect in a system with high solvent content, and does not influence the gloss and the corrosion resistance of the system. The thickener is selected from Hamming RHEOLATE 299 or Borchi gel 0620; the dispersant may be selected as BYK 190; the wetting agent may be selected as TEGO TWIN 4100; the defoamer was selected as TEGO 901W.
Further, the filler includes, in parts by weight, 5-8 parts barium sulfate (e.g., 5 parts, 6 parts, 7 parts, 8 parts, and any interval therebetween) and 3-5 parts talc (e.g., 3 parts, 4 parts, 5 parts, and any interval therebetween).
Optionally, the dispersion fineness of barium sulfate is not more than 20 μm. If the dispersion fineness of barium sulfate is higher (more than 20 mu m), the finally formed paint film has rough appearance and poor salt mist and water resistance effects.
Further, the single-component water-based epoxy primer also comprises the following components in parts by weight: and 5-8 parts of the anti-rust pigment (such as 5 parts, 6 parts, 7 parts and 8 parts and the interval value between any two endpoint values). The addition of the anti-rust pigment plays a role in rust prevention, and the cost is high due to the fact that the addition amount of the anti-rust pigment is too large; if the amount of the additive is too small, the rust inhibitive performance is poor.
Optionally, the antirust pigment is one or a mixture of zinc phosphate and aluminum tripolyphosphate.
The dispersion fineness of the antirust pigment is not more than 20 mu m. If the dispersion fineness of the rust-preventive pigment is more than 20 mu m, the finally formed paint film has rough appearance and poor salt mist and water resistance effects.
Further, the single-component water-based epoxy primer also comprises the following components in parts by weight: 0.5-1 part (such as 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part and the interval value between any two endpoints) of flash rust inhibitor. The addition of the flash rust inhibitor can further improve the rust and corrosion resistance of the system. The flash rust inhibitor can be one or more of CK16, R-765 and R-760F.
The invention also provides a preparation method of the single-component water-based epoxy primer for curtain coating, which comprises the following steps:
step one, mixing deionized water, a dispersing agent, a defoaming agent, titanium dioxide and a filler in parts by weight to obtain a first mixture;
and step two, stirring the first mixture, sequentially adding the epoxy resin emulsion, the film-forming aid, the wetting agent and the thickening agent according to the parts by weight, and continuously stirring and uniformly mixing to obtain the single-component waterborne epoxy primer.
The first step is specifically as follows: adding deionized water, a dispersing agent, a defoaming agent, titanium dioxide and a filler into a dispersion kettle according to the parts by weight, and dispersing at a dispersion speed of more than 2000rpm until the fineness is less than 30 micrometers to obtain a first mixture. The first mixture can be uniformly dispersed when the first mixture is dispersed to the fineness of less than 30 mu m, and then the uniform single-component water-based epoxy primer can be obtained.
In the second step, the stirring speed for stirring the first mixture is 500-800rpm (such as 500rpm, 600rpm, 700rpm, 800rpm, and any interval therebetween).
Further, in the first step, the first mixture also comprises an anti-rust pigment; in the second step, before adding the thickening agent according to the parts by weight, the method further comprises the following steps: adding an anti-flash rust agent according to the weight part; so as to improve the corrosion resistance of the single-component water-based epoxy primer.
The one-component water-based epoxy primer for flow coating and the method for preparing the same according to the present invention will be described in detail with reference to the following specific examples.
Example 1
The single-component waterborne epoxy primer for curtain coating in the embodiment comprises the following raw materials in parts by weight: 50 parts of epoxy resin emulsion, 8 parts of titanium dioxide, 8 parts of barium sulfate, 3 parts of talcum powder, 1 part of film-forming additive, 8 parts of antirust pigment, 1 part of dispersing agent, 0.5 part of defoaming agent, 0.5 part of wetting agent, 0.5 part of flash rust inhibitor, 0.5 part of thickening agent and 20 parts of deionized water.
The preparation method of the one-component waterborne epoxy primer of the embodiment comprises the following steps:
(1) adding deionized water, a dispersing agent, a defoaming agent, titanium dioxide, barium sulfate, talcum powder and an anti-rust pigment into a dispersion kettle according to the parts by weight, and dispersing at a dispersion speed of more than 2000rpm until the fineness is less than 30 micrometers to obtain a first mixture;
(2) stirring the first mixture at a stirring speed of 500 plus 800rpm, sequentially adding the epoxy resin emulsion, the film forming aid, the flash rust inhibitor, the wetting agent and the thickening agent according to the parts by weight, and continuously stirring and uniformly mixing to obtain the single-component waterborne epoxy primer.
Example 2
The single-component waterborne epoxy primer for curtain coating in the embodiment comprises the following raw materials in parts by weight: 55 parts of epoxy resin emulsion, 9 parts of titanium dioxide, 6 parts of barium sulfate, 4 parts of talcum powder, 4 parts of film-forming additive, 7 parts of antirust pigment, 0.8 part of dispersing agent, 1 part of defoaming agent, 0.3 part of wetting agent, 0.6 part of anti-flash rust agent, 0.7 part of thickening agent and 17 parts of deionized water.
The preparation method of the one-component waterborne epoxy primer of this example is the same as the preparation method of example 1.
Example 3
The single-component waterborne epoxy primer for curtain coating in the embodiment comprises the following raw materials in parts by weight: 60 parts of epoxy resin emulsion, 10 parts of titanium dioxide, 5 parts of barium sulfate, 5 parts of talcum powder, 5 parts of film-forming additive, 5 parts of antirust pigment, 0.7 part of dispersing agent, 0.5 part of defoaming agent, 0.5 part of wetting agent, 0.7 part of flash rust inhibitor, 1 part of thickening agent and 15 parts of deionized water.
The preparation method of the one-component waterborne epoxy primer of this example is the same as the preparation method of example 1.
Example 4
The single-component waterborne epoxy primer for curtain coating in the embodiment comprises the following raw materials in parts by weight: 52 parts of epoxy resin emulsion, 8 parts of titanium dioxide, 5 parts of barium sulfate, 3 parts of talcum powder, 3 parts of film-forming additive, 5 parts of antirust pigment, 0.5 part of dispersing agent, 0.6 part of defoaming agent, 0.2 part of wetting agent, 0.5 part of flash rust inhibitor, 0.6 part of thickening agent and 10 parts of deionized water.
The preparation method of the one-component waterborne epoxy primer of this example is the same as the preparation method of example 1.
Comparative example 1
The difference between the comparative example and the example 1 is that the dosage of the epoxy resin emulsion in the raw materials is 40 parts, and the other components are the same as the components in the example 1; also, the preparation method of the one-component waterborne epoxy primer of this comparative example was the same as that of example 1.
Comparative example 2
The comparative example is different from the example 1 in that the amount of the rust preventive pigment in the raw material is 2 parts, and the other components are the same as those in the example 1; also, the preparation method of the one-component waterborne epoxy primer of this comparative example was the same as that of example 1.
Comparative example 3
The comparative example is different from the example 1 in that the antirust pigment is removed from the raw materials, and other components are the same as the example 1; also, the preparation method of the one-component waterborne epoxy primer of this comparative example was the same as that of example 1.
Comparative example 4
This comparative example is different from example 1 in that the amount of the antifoaming agent used in the raw material is 0.2 part, and the other components are the same as in example 1; also, the preparation method of the one-component waterborne epoxy primer of this comparative example was the same as that of example 1.
Comparative example 5
The difference between the comparative example and the example 1 is that the amount of the film-forming assistant in the raw materials is 7 parts, and the other components are the same as those in the example 1; also, the preparation method of the one-component waterborne epoxy primer of this comparative example was the same as that of example 1.
The single-component water-based epoxy primers prepared in examples 1 to 4 and comparative examples 1 to 5 were subjected to performance tests, wherein the performance tests included the cross-cut adhesion, water resistance, salt water resistance (3% NaCl), salt spray resistance, drying time (25 ℃), hardness, and curtain coating defoaming property, and the cross-cut adhesion test was performed with reference to GB/T9286, the water resistance (3% NaCl) test was performed with reference to GB/T1733, the salt water resistance (3% NaCl) test was performed with reference to GB/T9274, the salt spray resistance test was performed with reference to GB/T1771, the drying time (25 ℃) test was performed with reference to GB/T1728, the hardness test was performed with reference to GB/T6739, and the curtain coating defoaming property test was specifically performed: the thickness of the one-time spray coating dry film of the automatic spray coating equipment is 20-40 mu m, no bubble exists, the thickness of the one-time spray coating dry film of the manual spray coating equipment is 30-60 mu m, and the condition that the spray coating defoaming property is good is indicated, otherwise, the condition that the spray coating defoaming property is poor is indicated. The results of the performance tests of the one-component waterborne epoxy primers prepared in examples 1-3 and comparative examples 1-4 are shown in table 1.
TABLE 1 Performance data for the one-component waterborne epoxy primers prepared in examples 1-4 and comparative examples 1-5
As can be seen from the performance results in Table 1, compared with comparative examples 1-5, the single-component waterborne epoxy primer in examples 1-4 of the present invention has an adhesion of 0 grade, and particularly has a better adhesion, and a salt spray resistance of more than 200 hours, so the single-component waterborne epoxy primer has good corrosion resistance, high hardness (greater than or equal to H), a drying time of less than 30min, a fast drying speed, and good defoaming performance, and is very suitable for a curtain coating process. Wherein, from the performance results of comparative example 1, it can be seen that, when the amount of the epoxy resin emulsion is small, the prepared single-component waterborne epoxy primer has poor adhesion, water resistance, salt water resistance and salt spray resistance; as can be seen from comparative examples 2 and 3, the water resistance, salt water resistance and salt spray resistance of the prepared one-component water-based epoxy primer become poor after the addition of the rust preventive pigment is too small or removed; as can be seen from comparative example 4, when the amount of the defoaming agent is small, the flow coating defoaming property of the prepared single-component waterborne epoxy primer is poor; as can be seen from comparative example 5, when the amount of the film-forming aid used was large, the drying time of the one-component waterborne epoxy primer prepared became long.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The single-component water-based epoxy primer for curtain coating is characterized by comprising the following raw materials in parts by weight:
50-60 parts of epoxy resin emulsion, 8-10 parts of titanium dioxide, 8-13 parts of filler, 1-5 parts of film-forming additive, 0.5-1 part of thickening agent, 0.5-1 part of dispersing agent, 0.5-1 part of defoaming agent, 0.2-0.5 part of wetting agent and 10-20 parts of deionized water;
wherein the epoxy resin emulsion is a single-component self-crosslinking epoxy resin emulsion.
2. The one-part waterborne epoxy primer for curtain coating of claim 1, wherein the thickener is a polyurethane associative thickener.
3. The one-component waterborne epoxy primer for flow coating of claim 1, wherein the filler comprises, in parts by weight, 5-8 parts barium sulfate and 3-5 parts talc.
4. The one-component water-based epoxy primer for curtain coating according to claim 3, wherein the dispersion fineness of barium sulfate is not more than 20 μm.
5. The one-component waterborne epoxy primer for flow coating according to any one of claims 1 to 4, wherein the one-component waterborne epoxy primer further comprises, in parts by weight: 5-8 parts of an antirust pigment.
6. The one-component water-based epoxy primer for curtain coating according to claim 5, wherein the rust-preventive pigment is one or a mixture of two of zinc phosphate and aluminum tripolyphosphate;
the dispersion fineness of the antirust pigment is not more than 20 mu m.
7. The one-component waterborne epoxy primer for curtain coating of claim 5, wherein the one-component waterborne epoxy primer further comprises, in parts by weight: 0.5-1 part of flash rust inhibitor.
8. A method of preparing the one-component waterborne epoxy primer for flow coating according to any one of claims 1 to 7, comprising the steps of:
step one, mixing deionized water, a dispersing agent, a defoaming agent, titanium dioxide and a filler in parts by weight to obtain a first mixture;
and step two, stirring the first mixture, sequentially adding the epoxy resin emulsion, the film-forming aid, the wetting agent and the thickening agent according to the parts by weight, and continuously stirring and uniformly mixing to obtain the single-component waterborne epoxy primer.
9. The method for preparing a one-component waterborne epoxy primer for curtain coating according to claim 8, wherein the first step is specifically: adding deionized water, a dispersing agent, a defoaming agent, titanium dioxide and a filler into a dispersion kettle according to the parts by weight, and dispersing at a dispersion speed of more than 2000rpm until the fineness is less than 30 micrometers to obtain a first mixture;
in the second step, the stirring speed for stirring the first mixture is 500-800 rpm.
10. The method for preparing a one-component waterborne epoxy primer for flow coating according to claim 8, wherein in the first step, the first mixture further comprises an anti-corrosive pigment;
in the second step, before adding the thickening agent according to the parts by weight, the method further comprises the following steps: adding the flash rust inhibitor according to the weight part.
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