CN117534997A - Water-based single-component epoxy resin coating and preparation method and application thereof - Google Patents
Water-based single-component epoxy resin coating and preparation method and application thereof Download PDFInfo
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- CN117534997A CN117534997A CN202311547960.5A CN202311547960A CN117534997A CN 117534997 A CN117534997 A CN 117534997A CN 202311547960 A CN202311547960 A CN 202311547960A CN 117534997 A CN117534997 A CN 117534997A
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- epoxy resin
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- 238000000576 coating method Methods 0.000 title claims abstract description 89
- 239000011248 coating agent Substances 0.000 title claims abstract description 88
- 239000003822 epoxy resin Substances 0.000 title claims abstract description 80
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims description 36
- 239000000049 pigment Substances 0.000 claims abstract description 35
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 19
- 229920005989 resin Polymers 0.000 claims abstract description 19
- 239000011347 resin Substances 0.000 claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- 239000010703 silicon Substances 0.000 claims abstract description 19
- 239000006184 cosolvent Substances 0.000 claims abstract description 17
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000002562 thickening agent Substances 0.000 claims description 19
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 14
- 239000002270 dispersing agent Substances 0.000 claims description 12
- 239000002518 antifoaming agent Substances 0.000 claims description 10
- 239000003112 inhibitor Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 239000000080 wetting agent Substances 0.000 claims description 9
- 239000006229 carbon black Substances 0.000 claims description 8
- 230000002401 inhibitory effect Effects 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 claims description 6
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 claims description 6
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 6
- 230000003472 neutralizing effect Effects 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 239000011253 protective coating Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 230000008961 swelling Effects 0.000 claims description 5
- 239000013530 defoamer Substances 0.000 claims description 4
- 150000001414 amino alcohols Chemical group 0.000 claims description 3
- 229910001424 calcium ion Inorganic materials 0.000 claims description 3
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 239000013522 chelant Substances 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical group [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims 1
- 229940003871 calcium ion Drugs 0.000 claims 1
- 239000003973 paint Substances 0.000 abstract description 22
- 150000003839 salts Chemical class 0.000 abstract description 12
- 239000000853 adhesive Substances 0.000 abstract description 11
- 230000001070 adhesive effect Effects 0.000 abstract description 11
- 239000007921 spray Substances 0.000 abstract description 8
- 238000001035 drying Methods 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 22
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 239000004593 Epoxy Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- 229920002050 silicone resin Polymers 0.000 description 11
- 239000000839 emulsion Substances 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 229920006334 epoxy coating Polymers 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical group CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229910001060 Gray iron Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical group [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229940058020 2-amino-2-methyl-1-propanol Drugs 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 150000001768 cations Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- VCMIRXRRQJNZJT-KANKAIPDSA-N methyl (1S,15R,17S,18S)-17-ethyl-6-[(1S,12R,14R,15Z,18S)-15-ethylidene-18-methoxycarbonyl-17-methyl-10,17-diazatetracyclo[12.3.1.03,11.04,9]octadeca-3(11),4,6,8-tetraen-12-yl]-7-methoxy-3,13-diazapentacyclo[13.3.1.02,10.04,9.013,18]nonadeca-2(10),4,6,8-tetraene-1-carboxylate Chemical compound CC[C@H]1C[C@H]2CN3CCC4=C(NC5=C4C=C(OC)C(=C5)[C@H]4C[C@@H]5[C@@H]([C@H](CC6=C4NC4=C6C=CC=C4)N(C)C\C5=C/C)C(=O)OC)[C@](C2)([C@H]13)C(=O)OC VCMIRXRRQJNZJT-KANKAIPDSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229950009271 voacamine Drugs 0.000 description 1
- 238000009736 wetting Methods 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/14—Gas barrier composition
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 invention discloses a water-based single-component epoxy resin coating, which is prepared from the following raw materials in percentage by weight: 35-45% of water-based modified epoxy resin, 5-15% of organic silicon resin, 5-10% of antirust pigment, 20-25% of pigment and filler, 3-7% of water-based auxiliary agent, 4-7% of cosolvent and 10-25% of water; the aqueous modified epoxy resin is prepared by adopting inorganic hydrophilic group modified epoxy resin. The aqueous single-component low-temperature self-drying coating prepared by the invention has the advantages that the coating appearance, impact resistance, adhesive force, hardness and salt spray resistance all meet the performance requirements of the coating for automobile brake system parts, the prepared paint film has smooth appearance, excellent impact resistance, adhesive force, hot water resistance, wet heat resistance and salt spray resistance, and long-term effective protection on the brake system parts is realized.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a water-based single-component epoxy resin coating, and a preparation method and application thereof.
Background
At present, common materials of parts of an automobile brake system are wear-resistant HT200-300 gray cast iron, and as the cast iron materials are brittle, brittle fracture can occur once the parts are aged, so that dangerous accidents are caused. In order to extend the service life, these components must be protective coated. Compared with the traditional solvent paint, the green and environment-friendly water paint is the main choice of the existing brake system part painting manufacturers. However, compared with the solvent-borne coating, the water-borne coating is a conductor, the carbon content of gray cast iron is higher, electrochemical corrosion is easy to occur under a complex use environment to cause loss, and meanwhile, in the emergency braking process of an automobile, the instantaneous temperature of part parts in a braking system can be quickly increased to more than 200 ℃, so that the requirements on the performance of the coating are higher, and the coating must have better hardness, corrosion resistance and heat resistance.
At present, the coating of automobile brake system parts generally adopts two major categories of aqueous single-component coating and aqueous double-component epoxy coating. The aqueous single-component coating system has the advantages of convenient coating, low price and the like, but in practical application, the single-component coating is coated on an gray iron casting and is far from the salt spray test result of a standard test board, the protective performance is far from meeting the requirement, and meanwhile, when the temperature is raised to more than 200 ℃, a paint film is easy to be brittle and fall off. In order to ensure the protective performance of the coating, manufacturers only select the aqueous bi-component epoxy coating with more excellent performance. The water-based bi-component epoxy paint can form a compact coating only by chemical reaction with a curing agent, so that the problems of complicated operation, limited pot life and the like exist in the actual construction on site, the stability of the coating performance is difficult to ensure, and the construction is inconvenient. Meanwhile, the epoxy coating has the defect of poor heat resistance, and when the temperature is increased to more than 200 ℃, the coating is easy to yellow and crisp, the adhesive force, mechanical property and corrosion resistance of the coating are rapidly reduced, and long-term effective protection is difficult to be provided for the use of parts of a braking system. Therefore, the single-component coating with easy construction and excellent heat resistance, moist heat resistance and corrosion resistance has great significance for the protective coating of automobile brake system parts.
Disclosure of Invention
In order to overcome the problems of the prior art, one of the purposes of the present invention is to provide an aqueous one-component epoxy resin coating. The water-based single-component coating for the parts of the braking system has the advantages of convenient field construction, low energy consumption, lower VOC content, no phosphorus and heavy metal elements, high temperature resistance, damp and heat resistance and excellent corrosion resistance. The second purpose of the invention is to provide a preparation method of the aqueous single-component epoxy resin coating. The invention also aims at the application of the aqueous single-component epoxy resin coating.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the first aspect of the invention provides a water-based single-component epoxy resin coating, which is prepared from the following raw materials in percentage by weight: 35-45% of water-based modified epoxy resin, 5-15% of organic silicon resin, 5-10% of antirust pigment, 20-25% of pigment and filler, 3-7% of water-based auxiliary agent, 4-7% of cosolvent and 5-15% of water; the aqueous modified epoxy resin comprises an inorganic hydrophilic group modified epoxy resin.
The epoxy resin part in the structure of the water-based film forming substance generated by the hybridization polymerization process of the epoxy resin and the inorganic hydrophilic group has excellent chemical resistance and high adhesive force, and the branched-chain connected inorganic substance has high permeability, weather resistance and heat resistance.
Preferably, the feedstock further comprises 1% to 2.5% carbon black.
Preferably, the raw materials further comprise 0.1% -0.5% of bentonite.
Preferably, the aqueous single-component epoxy resin coating is prepared from the following raw materials in percentage by weight: 37-43% of water-based modified epoxy resin, 7-13% of organic silicon resin, 6-8% of antirust pigment, 20-23% of pigment and filler, 3-7% of water-based auxiliary agent, 4-7% of cosolvent and 7-12% of water; the aqueous modified epoxy resin is prepared by adopting inorganic hydrophilic group modified epoxy resin.
More preferably, the aqueous single-component epoxy resin coating is prepared from the following raw materials in percentage by weight: 37-43% of water-based modified epoxy resin, 7-13% of organic silicon resin, 6-8% of rust-proof pigment, 20-23% of pigment and filler, 3-7% of water-based auxiliary agent, 4-7% of cosolvent, 7-12% of water, 1-2.5% of carbon black and 0.1-0.5% of bentonite; the aqueous modified epoxy resin is prepared by adopting inorganic hydrophilic group modified epoxy resin.
Preferably, the inorganic hydrophilic group-modified epoxy resin includes an inorganic silicon-modified epoxy resin.
Preferably, the rust inhibitive pigment is a calcium ion silica exchange type rust inhibitive pigment.
Preferably, the pigment and filler is selected from one or more of barium sulfate, kaolin and mica powder.
More preferably, the pigment and filler is a mixture of barium sulfate and mica powder, and the mass ratio of the pigment and filler is (13-18) to (5-8).
More preferably, the barium sulfate is precipitated barium sulfate; the mica powder is sericite powder.
Preferably, the aqueous auxiliary comprises a dispersant, an antifoaming agent, a wetting agent, a thickener, a neutralizing agent and a flash rust inhibitor.
More preferably, the dispersant is a high molecular polymer containing a plurality of pigment anchoring groups; the defoaming agent is an organosilicon defoaming agent; the wetting agent is a siloxane gemini surfactant; the flash rust inhibitor is an organic polymer which does not contain nitrite; the neutralizer is an amino alcohol neutralizer; the thickener is polyurethane thickener and/or hydrophobic modified alkali swelling thickener.
One part of the structure of the dispersing agent is an anchoring group, the other part of the structure of the dispersing agent is a solvated chain segment, the anchoring group is adsorbed on the surface of the particles in a form of multi-point anchoring formed on the surface of the particles by dipole force, the solvated chain segment has good compatibility with a dispersing medium, and a protective layer with enough thickness is formed on the surface of the solid particles, so that the dispersing agent has good wetting effect on pigment and filler, excellent dispersibility and stability, and excellent water resistance and salt fog resistance in an aqueous system; the defoaming agent is an organic silicon defoaming agent, has strong defoaming and foam breaking properties, has good system compatibility, and is not easy to cause paint film defects such as shrinkage cavity and the like; the wetting agent is a siloxane gemini surfactant, can effectively reduce the surface tension of a system, has good permeability to porous cast iron base materials difficult to wet, and is matched with a defoaming agent for use, so that a formed paint film is continuous and compact, and the adhesive force and salt spray resistance of the paint film are improved; the flash rust inhibitor consists of a modified organic chelate, and a dense passivation substance is formed on the metal surface by chelating a special polymer, so that the salt spray resistance of a paint film can be improved while flash rust is prevented; the neutralizer is an amino alcohol neutralizer, can effectively reduce the smell of the paint, adjust the pH value of the system, and improve the performance of the paint while exerting the effect of the alkali swelling thickener.
Further preferably, the neutralizing agent is 2-amino-2-methyl-1-propanol.
Further preferably, the mass ratio of the polyurethane thickener to the hydrophobically modified alkali swelling thickener is 0.2-0.4:1, which can effectively solve the problem of difficult thickening of a single-component epoxy system and lead the paint to have excellent storage stability.
Preferably, the cosolvent is selected from one or more of ethylene glycol butyl ether, diethylene glycol butyl ether and dipropylene glycol butyl ether.
More preferably, the cosolvent is a mixture of ethylene glycol butyl ether, diethylene glycol butyl ether and dipropylene glycol butyl ether, and the mass ratio of the cosolvent to the mixture is (2-1): 1.
The second aspect of the invention provides a preparation method of the aqueous single-component epoxy resin coating of the first aspect, which comprises the following steps:
s1, dispersing part of water-based modified epoxy resin, part of water-based auxiliary agent, antirust pigment and pigment filler in water to obtain pre-dispersed slurry, and grinding to obtain color paste;
s2, mixing the color paste with the residual water-based modified epoxy resin, the organic silicon resin, the residual water-based auxiliary agent and the cosolvent to prepare the water-based single-component epoxy resin coating.
Preferably, the particle size of the color paste is below 20 μm.
Preferably, in step S1, the dispersing process is as follows: dispersing at high speed of 500-1000r/min for 10-15min.
Preferably, in step S1, the grinding is carried out at a speed of 2500-4000 r/min.
Preferably, in step S1, a part of the aqueous single-component epoxy resin, the neutralizing agent, water, the dispersing agent and the defoaming agent are uniformly mixed to obtain the pre-dispersed slurry.
Preferably, in the step S1, the dosage of the water-based modified epoxy resin is 40% -60% of the total dosage of the water-based modified epoxy resin.
Preferably, in step S2, the specific steps are as follows: firstly, mixing the residual water-based modified epoxy resin, the organic silicon resin and the neutralizer in the residual water-based auxiliary agent to form a mixture, and then mixing and dispersing the mixture with the residual water-based auxiliary agent, the cosolvent and the color paste to obtain the water-based single-component epoxy resin coating.
Preferably, in the step S2, the dosage of the water-based modified epoxy resin is 40% -60% of the total dosage of the water-based modified epoxy resin.
More preferably, in step S2, the mixing process of the mixture is as follows: dispersing at high speed for 5-10min at a rotation speed of 800-1000 r/min.
More preferably, in step S2, the mixing process of the paint is as follows: dispersing at 400-800r/min for 5-10min.
In a third aspect, the present invention provides the use of the aqueous one-component epoxy resin coating according to the first aspect of the present invention for the preparation of a protective coating.
Preferably, the application of the aqueous single-component epoxy resin coating in preparing protective coatings of automobile brake system parts is provided.
The beneficial effects of the invention are as follows:
the invention provides a water-based single-component epoxy resin coating, which is used as a coating for automobile brake system parts, does not need to use a curing agent, has no limitation of pot life, is convenient for site construction, can be self-dried or baked at low temperature, and saves energy consumption; the coating prepared by the invention has the adhesive force of 0-1 level on the automobile brake system part, still has high corrosion resistance when the film thickness is 20-30 mu m, has neutral salt fog resistance on gray cast iron of not less than 500H, has hardness of not less than H, and can effectively prolong the service life of the automobile brake system part; the paint for the automobile brake system parts, which is prepared by the invention, has excellent high temperature resistance, a paint film is not pulverized, cracked or fallen off after being used for 1h at 300 ℃, the adhesive force is 0-1 level, and the neutral salt fog resistance is not less than 500h; the paint for the automobile brake system parts, which is prepared by the invention, has low VOC content, does not contain heavy metals, and is friendly to human bodies and environment.
In particular, compared with the prior art, the invention has the following advantages:
1) The waterborne modified epoxy resin provided by the invention is used as a first film forming material and the organic silicon resin is used as a second film forming material, the film can be formed at normal temperature without a curing agent, the first film forming material has excellent adhesive force and corrosion resistance of epoxy, and has good heat resistance after being modified by inorganic silicon salt, and the organic silicon in the second film forming material is used for modifying the first film forming material, so that the hardness and heat resistance of the coating are greatly improved. The invention selects proper first film forming material and second film forming material to cooperate, which provides better performance for coating film and lays foundation for subsequent preparation of high-performance single-component coating.
2) The invention selects proper dispersant, defoamer, wetting agent, flash rust inhibitor, non-VOC amine neutralizer and thickener to be compounded into the high-performance single-component coating with proper viscosity and fluidity under the synergistic action, thereby laying a foundation for preparing the single-component coating with high heat resistance and corrosion resistance by matching with the rust-proof pigment and filler system in the follow-up process.
In addition, the rust-proof pigment adopted by the invention is a calcium ion silicon dioxide exchange type rust-proof pigment, does not contain heavy metal and phosphorus elements, can form a complex compound covering film with excellent adhesiveness with a metal substrate, passivates the metal surface, and is firmly adsorbed on the metal surface, so that the protection effect is achieved, and meanwhile, metal cations form cathodic protection on the substrate surface when corrosion occurs, so that further corrosion of the metal is prevented; the precipitated barium sulfate adopted by the filler has stable performance, good water resistance, acid and alkali resistance and high temperature resistance without losing gloss; the sericite powder crystal is of a two-dimensional lamellar structure and is provided with hydroxyl active groups, the sericite powder crystal is easy to combine and wind with molecules in emulsion and solvent, and the sericite powder crystal is arranged in parallel in a coating film and overlapped up and down, so that a compact layer network structure is formed inside the coating film, the comprehensive mechanical property and the permeation resistance of the coating film are improved, and the salt spray resistance of the coating film is effectively improved. The antirust pigment and the filler system in the invention combine physical barrier effect and electrochemical protection effect, and can effectively improve the mechanical property, water resistance and corrosion resistance of a paint film.
3) The invention provides a single-component coating with easy construction and excellent heat resistance, moist heat resistance and corrosion resistance, which can be applied to the protective coating of automobile brake system parts, solves the problems that the coating is easy to yellow and crisp at the temperature of more than 200 ℃, the adhesive force, mechanical property and corrosion resistance of the coating are rapidly reduced, and realizes the long-term effective protection of the brake system parts.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The starting materials used in the examples below, unless otherwise specified, were all available from conventional commercial sources or were isolated by simple synthetic preparation; the processes used, unless otherwise specified, are all conventional in the art.
The reagent types used in the following examples and comparative examples are specifically:
the aqueous single-component epoxy resin of the first film forming agent is selected from DG C690 of Hua Shengdi Gao (Nanjing) new material technology Co., ltd;
the organic silicon resin, the silicon modified intermediate and the organic-inorganic hybrid ceramic resin in the second film forming material are respectively Y-B111, Y-B33 and Y-3370 of the new material Co., ltd;
the rust-inhibiting pigment is JP-B8116 and JP-B808 of Junjiang science and technology Co., ltd; the pigment and filler is barium sulfate XM-PB06 of Xinmei group and mica powder GA-5 of Anhui Gray New Material science and technology Co., ltd;
the dispersing agent is UNIQ SPERSE 586U of Youka chemical, the defoaming agent is HOS 465DC of Shanghai Holsman's industry Co., ltd, the wetting agent is HOS2413 of Shanghai Holsman's industry Co., ltd, the neutralizing agent is AMP-95 of Guangzhou Bichi commercial Co., ltd, and the flash rust inhibitor is HY-70 of Qingdao Enzement chemical Co., ltd;
the polyurethane thickener is RHEOLATE FX 1010 of Haimines special chemical company, and is nonionic association thickener of polyether polyurethane; the hydrophobic modified alkali swelling thickener is commonly Codd TM H-150；
The carbon black is MA100 and cabot E-1600 of Mitsubishi Japanese;
the bentonite is CLAYMITON EJ of Zhejiang Chang Anren Hengzhi technology Co., ltd.
Example 1
The embodiment provides a water-based single-component epoxy resin coating for automobile brake system parts, which comprises the following raw materials in percentage by weight:
first film forming material DG C690:40%;
second film forming material Y-B111:10 percent of
Dispersant UNIQ SPERSE 586U:2.0%;
defoamer HOS 465DC:0.4%;
wetting agent HOS2413:0.3%;
flash rust inhibitor HY-70:1.0%;
neutralizing agent AMP-95:0.4%;
and (3) a thickening agent: 1.3%;
rust-preventive pigment: 7.0%;
and (3) filling: 22%;
carbon black MA100:1.0% carbon black E1600:0.6%;
bentonite CLAYMINTON EJ:0.3%;
cosolvent: 5.0%;
deionized water: 8.7%;
wherein the thickener is RHEOLATE FX 1010 and Codd TM H-150, and RHEOLATE FX 1010 and Codd TM The mass ratio of H-150 is 0.3:1; the rust inhibitive pigment is composed of JP-B8116 and JP-B808, and the mass ratio of JP-B8116 and JP-B808 is 6:1; the filler consists of XM-PB06 and GA-5, and the mass ratio of the XM-PB06 to the GA-5 is 14:8; the cosolvent consists of ethylene glycol butyl ether, diethylene glycol butyl ether and dipropylene glycol butyl ether, and the mass ratio of the ethylene glycol butyl ether to the diethylene glycol butyl ether to the dipropylene glycol butyl ether is 2:2:1.
The embodiment also provides a preparation method of the water-based single-component epoxy resin coating for the automobile brake system parts, which comprises the following steps:
(1) Pre-dispersion
S1: under the stirring condition, sequentially adding 20% of aqueous single-component epoxy resin DG C690, 0.2% of neutralizer AMP-95, 8.7% of deionized water, 2% of dispersing agent UNIQ SPERSE 586U and 0.4% of defoaming agent HOS 465DC into a drawing cylinder, and uniformly mixing at the rotating speed of 400r/min to obtain a mixture;
s2: to the above mixture, 0.3% bentonite CLAYMITON EJ, 1.0% carbon black MA100, 0.6% carbon black E1600, 1.0% rust inhibitive pigment JP-B808, 6.0% rust inhibitive pigment JP-B8116, 8% filler GA-5, 14% filler XM-PB06 were successively added, and dispersed at a rotational speed of 800r/min for 10 minutes to obtain a pre-dispersed slurry.
(2) Grinding
Transferring the pre-dispersed slurry obtained in the step (1) to a sand mill for grinding, and grinding the color paste particle size to be less than 20 mu m at the rotating speed of 2500-4000r/min to obtain the color paste.
(3) Preparation of color paint
Under the stirring condition, adding the rest 20% aqueous single-component epoxy resin DG C690, 10% second film forming matter Y-B111 and 0.2% neutralizer AMP-95 into a drawing cylinder in turn, dispersing at high speed for 5min at the rotating speed of 800-1000r/min, and then adding 0.3% wetting agent HOS2413, 1.0% flash rust inhibitor HY-70, 0.3% thickener RHEOLATE FX 1010, 2% cosolvent ethylene glycol butyl ether, 2% cosolvent diethylene glycol butyl ether, 1.0% cosolvent dipropylene glycol butyl ether and 1.0% thickener Codd in turn under the stirring condition TM Dispersing color paste in H-150 and (2) at 600r/min for 5min, and filtering to obtain the final paint, namely the aqueous single-component epoxyAnd (3) a resin coating.
Example 2
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the weight percentage of the aqueous single-component epoxy resin coating DG C690 is 45%, and the weight percentage of the aqueous silicone resin Y-B111 is 5%.
Example 3
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the weight percentage of the aqueous single-component epoxy resin coating DG C690 is 35 percent, and the weight percentage of the aqueous silicone resin Y-B111 is 15 percent.
Comparative example 1
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the film former was the only first film former and the weight percent of the waterborne one-component epoxy coating DG C690 was 50%.
Comparative example 2
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the film former is only the second film former, and the weight percentage of the aqueous silicone resin Y-B111 is 50%.
Comparative example 3
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the weight percentage of the aqueous single-component epoxy resin coating DG C690 is 25%, and the weight percentage of the aqueous silicone resin Y-B111 is 25%.
Comparative example 4
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the second film forming material is a silicon modified intermediate Y-B33.
Comparative example 5
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the second film forming material is organic-inorganic hybrid ceramic resin Y-3370.
Comparative example 6
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the second film forming material is a mixture of aqueous silicone resin Y-B111 and silicon modified intermediate Y-B33, and the weight percentage of the aqueous silicone resin Y-B111 is 5%, and the weight percentage of the silicon modified intermediate Y-B33 is 5%.
Comparative example 7
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the second film forming material is a mixture of a silicon modified intermediate Y-B33 and an organic-inorganic hybrid ceramic resin Y-3370, wherein the weight percentage of the silicon modified intermediate Y-B33 is 5%, and the weight percentage of the organic-inorganic hybrid ceramic resin Y-3370 is 5%.
Comparative example 8
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the second film forming material is a mixture of water-based silicone resin Y-B111 and organic-inorganic hybrid ceramic resin Y-3370, wherein the weight percentage of the water-based silicone resin Y-B111 is 5%, and the weight percentage of the organic-inorganic hybrid ceramic resin Y-3370 is 5%.
Comparative example 9
The present embodiment provides a water-based single-component epoxy resin coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the first film former is a common aqueous single component epoxy emulsion.
Comparative example 10
The present embodiment provides a water-based two-component epoxy coating for automobile brake system components and a preparation method thereof, and the components and the preparation method in the present embodiment are the same as those in embodiment 1, and the differences from embodiment 1 are only that: the first film forming material is a commercially available aqueous bi-component epoxy emulsion prepared by modifying E51 and a polyamine curing agent, the aqueous bi-component epoxy emulsion has good shear stability, can be used for grinding, and is prepared into a main agent by the aqueous bi-component epoxy emulsion, wherein the mass ratio of the main agent to the curing agent is 6:1.
In order to visually recognize the differences between examples 1 to 3 and comparative examples 1 to 10, the respective components of examples 1 to 3 and comparative examples 1 to 10 are listed in Table 1.
Table 1 parameters of the respective components in examples 1 to 3 and comparative examples 1 to 10
The aqueous single-component low-temperature self-drying paint for automobile brake system parts prepared in examples 1 to 3 and comparative examples 1 to 10 was subjected to performance test, and specific test results and test standards are shown in table 2:
table 2 examples 1 to 3 and comparative examples 1 to 10 coating property test methods and results
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From the results in Table 2, it can be seen that:
(1) As can be seen from comparative example 1 and comparative examples 1-3, the present invention greatly improves the hardness and heat resistance of the coating by modifying the modified aqueous one-component epoxy resin with the aqueous silicone resin. The invention selects proper first film forming material and second film forming material to cooperate, which provides better performance for coating film and lays foundation for subsequent preparation of high-performance single-component coating.
(2) As can be seen from comparative example 1 and comparative examples 4 to 8, the compatibility of the aqueous functional resin and the epoxy emulsion is good, and the curing agent is not required to be used for film formation at normal temperature, so that the weather resistance, hardness, corrosion resistance, impact resistance and heat resistance of the epoxy emulsion can be improved; the remaining two resins are not effective in improving the performance of the epoxy emulsion.
(3) As can be seen from comparative example 1 and comparative examples 9 to 10, the modified aqueous single-component epoxy resin of the present invention is prepared by modifying with inorganic silicone salt, has good miscibility with aqueous silicone resin, can spontaneously combine with oxygen and hydrogen in air to form a compact paint film at normal temperature, and the other two epoxy emulsions have far lower heat resistance than that of example 1 because of poor miscibility with aqueous silicone resin.
The aqueous single-component low-temperature self-drying coating prepared by the method has the advantages that the coating appearance, impact resistance, adhesive force, hardness and salt spray resistance all meet the performance requirements of the coating for automobile brake system parts, the prepared paint film has smooth appearance, excellent impact resistance, adhesive force, hot water resistance, wet heat resistance and salt spray resistance, particularly, the coating has outstanding heat resistance, the hardness of the coating is increased after the coating is subjected to high temperature resistance of 300 ℃ multiplied by 1h, the performances in all aspects are kept good, and the coating is superior to the double-component epoxy coating prepared by the same method, and the service life of automobile brake system parts can be effectively prolonged.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. The aqueous single-component epoxy resin coating is characterized by being prepared from the following raw materials in percentage by weight: 35-45% of water-based modified epoxy resin, 5-15% of organic silicon resin, 5-10% of antirust pigment, 20-25% of pigment and filler, 3-7% of water-based auxiliary agent, 4-7% of cosolvent and 10-25% of water; the aqueous modified epoxy resin comprises an inorganic hydrophilic group modified epoxy resin.
2. The aqueous one-component epoxy resin coating of claim 1, wherein the raw materials further comprise 1% to 2.5% carbon black;
and/or the raw materials further comprise 0.1% -0.5% of bentonite.
3. The aqueous one-component epoxy resin coating of claim 1, wherein the inorganic hydrophilic group modified epoxy resin comprises an inorganic silicon modified epoxy resin.
4. The aqueous one-component epoxy resin coating according to claim 1, wherein the rust inhibitive pigment is a calcium-ion silica-exchanged rust inhibitive pigment.
5. The aqueous one-component epoxy resin coating according to claim 1, wherein the pigment filler is selected from one or more of barium sulfate, kaolin, mica powder.
6. The aqueous one-component epoxy resin coating of claim 1, wherein the aqueous auxiliary comprises at least one of a dispersant, an antifoaming agent, a wetting agent, a thickener, a neutralizing agent, and a flash rust inhibitor.
7. The aqueous one-component epoxy resin coating of claim 6, wherein the dispersant is a high molecular polymer containing a plurality of pigment anchoring groups; and/or, the defoamer is an organosilicon defoamer; and/or, the wetting agent is a silicone gemini surfactant; and/or, the flash rust inhibitor comprises a modified organic chelate; and/or, the neutralizer is an amino alcohol neutralizer; and/or the thickener comprises at least one of polyurethane thickener and hydrophobic modified alkali swelling thickener.
8. The aqueous one-component epoxy resin coating of claim 1, wherein the co-solvent is selected from one or more of ethylene glycol butyl ether, diethylene glycol butyl ether, dipropylene glycol butyl ether.
9. The method for preparing the aqueous single-component epoxy resin coating according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, dispersing part of water-based modified epoxy resin, part of water-based auxiliary agent, antirust pigment and pigment filler in water to obtain pre-dispersed slurry, and grinding to obtain color paste;
s2, mixing the color paste with the residual water-based modified epoxy resin, the organic silicon resin, the residual water-based auxiliary agent and the cosolvent to prepare the water-based single-component epoxy resin coating.
10. Use of the aqueous one-component epoxy resin coating according to any one of claims 1 to 8 for the preparation of protective coatings.
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