CN117402536A - Super-long salt-fog-resistant mildew-proof waterborne epoxy primer as well as preparation method and use method thereof - Google Patents
Super-long salt-fog-resistant mildew-proof waterborne epoxy primer as well as preparation method and use method thereof Download PDFInfo
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- 239000004593 Epoxy Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 150000003839 salts Chemical class 0.000 claims abstract description 35
- 150000001412 amines Chemical class 0.000 claims abstract description 32
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 32
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910000077 silane Inorganic materials 0.000 claims abstract description 30
- 239000007921 spray Substances 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000003973 paint Substances 0.000 claims abstract description 13
- 239000008367 deionised water Substances 0.000 claims abstract description 11
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 11
- 239000000049 pigment Substances 0.000 claims abstract description 9
- 239000003822 epoxy resin Substances 0.000 claims abstract description 8
- 239000000945 filler Substances 0.000 claims abstract description 8
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 8
- 125000003277 amino group Chemical group 0.000 claims abstract 7
- 238000003756 stirring Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 239000002270 dispersing agent Substances 0.000 claims description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 8
- 239000013008 thixotropic agent Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 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
- 238000000227 grinding Methods 0.000 claims description 6
- 239000003112 inhibitor Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 3
- 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 3
- 239000004576 sand Substances 0.000 claims description 3
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 3
- 239000004408 titanium dioxide Substances 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
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 2
- 238000007865 diluting Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000009775 high-speed stirring Methods 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229960000686 benzalkonium chloride Drugs 0.000 claims 1
- CADWTSSKOVRVJC-UHFFFAOYSA-N benzyl(dimethyl)azanium;chloride Chemical group [Cl-].C[NH+](C)CC1=CC=CC=C1 CADWTSSKOVRVJC-UHFFFAOYSA-N 0.000 claims 1
- 239000010445 mica Substances 0.000 claims 1
- 229910052618 mica group Inorganic materials 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract description 12
- 238000000576 coating method Methods 0.000 abstract description 10
- 239000000853 adhesive Substances 0.000 abstract description 8
- 230000001070 adhesive effect Effects 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000004132 cross linking Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 3
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- 239000006184 cosolvent Substances 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 abstract description 2
- 239000002987 primer (paints) Substances 0.000 description 24
- 239000003595 mist Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 239000002671 adjuvant Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910014314 BYK190 Inorganic materials 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241000220286 Sedum Species 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000013615 primer Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000126 substance Substances 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
-
- 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
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
-
- 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
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
Abstract
The invention discloses a super-long salt-fog-resistant mildew-proof water-based epoxy primer, a preparation method and a use method thereof, wherein the raw materials of the super-long salt-fog-resistant mildew-proof water-based epoxy primer comprise water-based epoxy resin, pigment and filler, deionized water, a water-based auxiliary agent and a water-based modified amine silane auxiliary agent. The invention uses deionized water to replace harmful cosolvent such as solvent benzene and the like to be reasonably matched with the water paint. Selecting a proper aqueous epoxy primer and a proper aqueous epoxy curing agent, and achieving crosslinking and curing according to a reasonable ratio of epoxy equivalent and active amine equivalent; meanwhile, the water-based modified amine silane auxiliary agent is added to enhance the crosslinking degree, and the quaternary amine does not directly react with epoxy because the quaternary amine does not exist in active amine, but is used as a catalytic ring for opening, so that the macromolecular with a bodily structure is finally generated. The mechanism greatly improves the adhesive force of the substrate coating, thereby improving salt spray resistance, water resistance and mildew resistance.
Description
Technical Field
The invention belongs to the technical field of paint preparation, and particularly relates to an ultra-long salt spray-resistant mildew-proof water-based epoxy primer, a preparation method and a use method thereof.
Background
At present, automobiles are necessities for people to live, and the automobile industry is also an economic index of a country. As the water-based epoxy primer in the automobile coating industry, all factories start, and foreign products are mature, but the indexes of salt spray resistance are not ideal, basically about 100 hours, and the requirements of 500-1000 hours for salt spray resistance of the oily epoxy primer are far less than that of the oily epoxy primer. In addition, the aqueous amine silane has stronger activity than the general silane coupling agent, and the oily or single aqueous silane is more commonly used in the market, and the mold removal effect is added, so that the storability of the coating is better protected. The preparation method disclosed by the invention is simple in process, and is suitable for industrial production under the existing equipment.
With the environmental protection policy of several years, the new national standard GB/T38597-2020 requires that the paint primer VOC of the oil-based automobile paint factory is less than or equal to 420g/L, particularly on the premise of greatly promoting the water-based paint, the water-based epoxy is used as a substrate to directly contact the coating, the indexes such as excellent adhesive force, water resistance, salt fog resistance and the like are important, the mildew resistance is an important index for paint storage, in addition, the water-based epoxy is not added with any solvent such as benzene, and the like, is quite environment-friendly, only needs to be cleaned by water after construction, and saves a lot of cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the ultra-long salt fog-resistant mildew-proof waterborne epoxy primer, and deionized water is used for replacing harmful cosolvent such as benzene and the like to be reasonably matched with the waterborne paint. Selecting a proper aqueous epoxy primer and a proper aqueous epoxy curing agent, and achieving crosslinking and curing according to a reasonable ratio of epoxy equivalent and active amine equivalent; meanwhile, the aqueous amine silane auxiliary agent is added to enhance the crosslinking degree, and the quaternary amine does not directly react with epoxy because the quaternary amine does not exist in active amine, but is used as a catalytic ring for opening, so that the macromolecular with a bodily structure is finally generated. The mechanism greatly improves the adhesive force of the substrate coating, thereby improving the salt spray resistance and the water resistance.
In order to achieve the above object, an aspect of the present invention adopts the following technical scheme:
the ultra-long salt spray resistant mildew-proof water-based epoxy primer can be applied to coating of metal products and comprises the following components in parts by weight:
40 parts of aqueous epoxy resin;
15 parts of pigment;
27 parts of filler;
15 parts of deionized water;
0.5-3 parts of water-based auxiliary agent;
1 part of water-based modified amine silane auxiliary agent.
Preferably, the selected resin is one or more of aqueous epoxy resins; the pigment is one or more of titanium dioxide and carbon black; the filler is one or more of superfine barium sulfate, talcum powder, zinc phosphomolybdate, zinc phosphate and aluminum tripolyphosphate; the selected auxiliary agent is one or more of water-based dispersing agent, water-based flash rust inhibitor, water-based anti-settling agent, water-based leveling agent, water-based defoaming agent and water-based thixotropic agent.
Wherein the aqueous auxiliary agent comprises the following components in parts by weight:
0.3 parts of water-based anti-settling agent;
1 part of an aqueous dispersant;
0.5 part of water-based leveling agent;
0.2 part of water-based flash rust inhibitor;
0.3 parts of aqueous defoamer;
0.3 parts of an aqueous thixotropic agent.
Wherein, the water-based modified amine silane auxiliary agent is prepared by Ji Anben bundle ammonium chloride and a silane coupling agent A-187 through replacing one alkoxy in silane with methyl of quaternary amine, and the reaction is as follows:
the specific preparation method of the water-based modified amine silane auxiliary agent comprises the following steps:
firstly diluting and dissolving quaternary amine to 40wt% by using deionized water, adding diluted quaternary amine into a reaction kettle provided with stirring equipment, adding silane according to the molar ratio of quaternary amine to silane of 1:1, mixing and stirring for 30min under the conditions that the temperature is controlled at 180 ℃ and the rotating speed is 800r/min by a heat exchanger, paying attention to temperature control, and cooling until the modified auxiliary agent is yellowish and transparent. Standing for 3h, delivering the solution to a refining kettle, and filtering under reduced pressure to obtain the finished product. Because the reaction is considered to be sufficient, the reaction allows a slight excess of quaternary amine, which can enhance the storage stability of the finished product without cementation. The main function of the aqueous modified amine silane auxiliary agent is that silane is used for providing crosslinking of paint, enhancing adhesive force between coating layers, improving salt spray resistance and water resistance of various substrate coatings and improving storage stability; can participate in the crosslinking of 2K waterborne epoxy.
The invention also provides a preparation method of the ultra-long salt spray-resistant mildew-proof waterborne epoxy primer, which comprises the following steps:
(1) Premixing: adding deionized water into a dispersing tank, then sequentially and slowly adding an aqueous dispersing agent, an aqueous defoaming agent and an aqueous anti-settling agent in an aqueous auxiliary agent, pigment and filler, and stirring at a high speed for 30-60 minutes;
(2) Grinding: grinding the slurry which is uniformly premixed in the step (1) by a sand mill until the fineness of the slurry is less than or equal to 30 mu m;
(3) And (3) preparing paint: adding the aqueous leveling agent, the aqueous modified amine silane auxiliary agent and the aqueous epoxy resin in the aqueous auxiliary agent into the ground slurry, dispersing while adding the aqueous anti-flash rust agent and the aqueous thixotropic agent in the aqueous auxiliary agent, stirring for 10-30 min, and filtering to obtain the ultra-long salt spray resistant aqueous epoxy primer.
Preferably, the speed of high-speed stirring in the step (1) is 800-1000r/min; in the step (3), the stirring speed is 600-800r/min.
The ultra-long salt spray resistant waterborne epoxy primer can be used for primer coating of corrosion-resistant products such as metal products, and the specific application method comprises the following steps:
(1) Mixing the ultra-long salt spray resistant water-based epoxy primer with a water-based curing agent, spraying the mixture on a metal plate for a metal product or an aluminum product, and leveling for 10-15 minutes;
(2) And (3) drying: baking at 70-80deg.C for 45-60min, cooling to room temperature, and standing for 24-72 hr.
The invention has the beneficial effects that:
the ultra-long salt spray resistant waterborne epoxy primer prepared by the invention has excellent performance, and the performance meets the coating process requirements of automobile metal products:
firstly, the adhesive force is better than that of foreign products, and the salt fog resistance reaches the standard for 500 hours;
second, the semi-open cover can not generate bacteria after being stored for half a year, has excellent impact performance,
thirdly, the paint does not contain harmful solvents such as benzene and the like, and is environment-friendly;
fourth, on the basis of the existing equipment, the preparation method is simple in preparation process and suitable for industrial production.
Drawings
FIG. 1 is an infrared spectrum of a quaternary amine (a), a silane (b) and an aqueous modified amine silane adjuvant (c).
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
In the case where the object of the present invention is clarified and explained by the following examples, the components of the composition are explained in terms of parts by weight as a general standard. Unless otherwise indicated, "parts" in the examples of the present invention have the same meaning as parts by weight for the sake of brevity.
The concrete raw materials are as follows:
epoxy resin: purchased from hensmal corporation
And (3) pigment: MA100 carbon black purchased from Mitsubishi Japan Co
Titanium dioxide procurement is from Baili-Dragon boa's R996
And (3) filling: zinc phosphate is purchased from Shanghai Junjiang chemical Co., ltd
Aluminum tripolyphosphate purchased from Shanghai Junjiang chemical Co., ltd
Superfine barium sulfate purchased from Shanghai Junjiang chemical Co., ltd
800 mesh talcum powder purchased from Shanghai Junjiang chemical industry Co., ltd
Aqueous anti-settling agent: r972 was purchased from De Gusa Co
R908 was purchased from Hamming Selfie chemical Co., ltd
Aqueous dispersants: BYK190 is purchased from Pick chemical Co., germany
Aqueous leveling agent: 4100 Purchase Sedum Kaschin
Aqueous defoamer: BYK022 purchased from Bick chemical Co., germany
Aqueous anti-flash rust agent: FA179 is purchased from Hamming Style
Aqueous thixotropic agent: 299 purchased from Haimingst
Silane auxiliary agent: a-187 was purchased from Michaer's quaternary amine adjuvants: 1227 purchasing self-department Weijin macro environment protection technology
The aqueous modified amine silane auxiliary agent in the embodiment of the invention is prepared by a laboratory.
Example 1
Table 1 example 1 parts by weight of raw materials
Table 2 weight portions of the curing agent raw materials
The preparation method of the ultra-long salt spray-resistant mildew-proof waterborne epoxy primer comprises the following steps:
(1) Premixing: adding 15 parts by weight of deionized water into a dispersing cylinder, then sequentially and slowly adding 1 part by weight of dispersing agent, 0.3 part of defoaming agent, 0.3 part of anti-settling agent, 15 parts by weight of pigment and 27 parts of filler, and stirring at a high speed for 30-60 minutes;
(2) Grinding: grinding the slurry which is uniformly premixed in the step (1) by a sand mill until the fineness of the slurry is less than or equal to 30 mu m;
(3) And (3) preparing paint: and adding 0.5 part by weight of water-based leveling auxiliary agent, 1 part by weight of water-based modified amine silane auxiliary agent, 40 parts by weight of water-based epoxy resin, 0.2 part by weight of water-based flash rust inhibitor and 0.3 part by weight of water-based thixotropic agent into the ground slurry, stirring for 10-30 min, and filtering to obtain the ultra-long salt spray-resistant mildew-resistant water-based epoxy paint.
The provided ultra-long salt spray resistant mildew-proof water-based epoxy primer product is used for the purposes of:
polishing and spraying the primer on the surface of the automobile aluminum plate, and leveling for 10-15min;
II, polishing and spraying the primer on the surface of the automobile metal galvanized sheet, and leveling for 10-15min;
the method for applying the aqueous super salt spray mildew-proof epoxy primer prepared in the example to automobile coating and the detection method and the results are as follows:
firstly, the prepared primer and curing agent are diluted by deionized water according to the weight ratio of 5:1, the viscosity is adjusted to 25-30S, the primer and curing agent are sprayed on polished galvanized plates and aluminum plates for automobiles, the spraying pressure is 0.4MPa, the film thickness is controlled to be 30-40 mu m, and the leveling is carried out for 10-15min;
and II, baking the sprayed metal plate at 70-80 ℃ for 40min, cooling, testing adhesive force, flexibility and impact, and standing for 72h, and testing water resistance, salt spray resistance, acid-base resistance and gasoline resistance.
Table 3 performance test method
TABLE 4 Performance test results
Note that: because the non-polished place exists in the construction state, the test is not performed
Adhesion to sanding.
Meanwhile, the data of a foreign well-known product Aishide waterborne epoxy are compared and tested:
TABLE 5 detection results of Extra-abroad Aishide product Performance
Meanwhile, the data of the water-based epoxy prepared without adding the water-based modified quaternary amine silane auxiliary agent are compared and tested:
TABLE 6 Performance test results
As can be seen from the comparison of the table 4, the table 5 and the table 6, the ultra-long salt mist-resistant and mildew-resistant epoxy primer prepared by the invention has the advantages that the adhesive force is not deviated when the modified quaternary amine silane auxiliary agent is not added, the salt mist resistance is only the time of a normal product, the oil product is far less than the requirement of more than 500 hours, and the ultra-long salt mist-resistant and mildew-resistant epoxy primer is also excellent in performance compared with the foreign known products, and the performance meets the coating process requirement of an automobile metal product: the adhesive force is 0 grade and the salt fog resistance is 500 hours qualified after baking at 70-80 ℃ for 40 min.
It should be understood that the foregoing examples of the present invention are merely illustrative of the present invention and not limiting of the embodiments of the present invention, and that various other changes and modifications can be made by those skilled in the art based on the above description, and the present invention is not intended to be exhaustive of all of the embodiments, and all obvious changes and modifications that come within the spirit of the invention are desired to be protected.
Claims (9)
1. An ultra-long salt spray resistant mildew-proof waterborne epoxy primer is characterized in that: comprises the following components in parts by weight:
40 parts of aqueous epoxy resin;
15 parts of pigment;
27 parts of filler;
15 parts of deionized water;
0.5-3 parts of water-based auxiliary agent;
1 part of water-based modified amine silane auxiliary agent.
2. The ultra-long salt spray mildew resistant waterborne epoxy primer according to claim 1, wherein the primer is characterized in that: the pigment is one or more of titanium dioxide and carbon black; the filler is one or more of superfine barium sulfate, talcum powder, mica powder, zinc phosphomolybdate, zinc phosphate and aluminum tripolyphosphate; the aqueous auxiliary agent is one or more of an aqueous dispersing agent, an aqueous flash rust inhibitor, an aqueous anti-settling agent, an aqueous leveling agent, an aqueous defoaming agent and an aqueous thixotropic agent.
3. The ultra-long salt spray mildew resistant waterborne epoxy primer according to claim 1, wherein the primer is characterized in that: the aqueous modified amine silane auxiliary agent is prepared and synthesized by quaternary amine and silane, wherein the quaternary amine is benzalkonium chloride, and the silane is silane coupling agent A-187.
4. The ultra-long salt spray mildew resistant waterborne epoxy primer according to claim 3, wherein the primer is characterized in that: the preparation method of the aqueous modified amine silane auxiliary agent comprises the following steps:
firstly diluting and dissolving quaternary amine to 40wt% by using deionized water, then adding diluted quaternary amine and silane into a reaction kettle provided with stirring equipment, placing the mixture into the reaction kettle, mixing and stirring the mixture for reaction for 30min under the conditions of 180 ℃ and stirring rotation speed of 800r/min, cooling, standing the mixture for 3h, then delivering the product into a refining kettle, and filtering out the product under reduced pressure to obtain the aqueous modified amine silane auxiliary agent.
5. The ultra-long salt spray mildew resistant waterborne epoxy primer according to claim 4, wherein the primer is characterized in that: the molar ratio of the quaternary amine to the silane is 1:1.
6. The ultra-long salt spray resistant waterborne epoxy primer of claim 2, wherein: the aqueous auxiliary agent comprises the following components in parts by weight:
0.3 parts of water-based anti-settling agent;
1 part of an aqueous dispersant;
0.5 part of water-based leveling agent;
0.2 part of water-based flash rust inhibitor;
0.3 parts of aqueous defoamer;
0.3 parts of an aqueous thixotropic agent.
7. A method for preparing the ultra-long salt spray mildew-resistant waterborne epoxy primer according to claim 6, which is characterized in that: comprises the following steps:
(1) Premixing: adding deionized water into a dispersing tank, then sequentially and slowly adding an aqueous dispersing agent, an aqueous defoaming agent and an aqueous anti-settling agent in an aqueous auxiliary agent, and stirring the pigment and the filler at a high speed for 30-60min;
(2) Grinding: grinding the slurry which is uniformly premixed in the step (1) by a sand mill until the fineness of the slurry is less than or equal to 30 mu m;
(3) And (3) preparing paint: and adding a leveling aid, a water-based modified amine silane aid and a water-based epoxy resin in the water-based auxiliary agent into the ground slurry, dispersing while adding a water-based flash rust inhibitor and a water-based thixotropic agent in the water-based auxiliary agent, stirring for 10-30 min, and filtering to obtain the ultra-long salt fog-resistant mildew-resistant water-based epoxy primer.
8. The preparation method of the ultra-long salt spray-resistant mildew-proof waterborne epoxy primer, which is characterized by comprising the following steps: the high-speed stirring speed in the step (1) is 800-1000r/min; in the step (3), the stirring speed is 600-800r/min.
9. A method for using the ultra-long salt spray mildew resistant waterborne epoxy primer according to any one of claims 1-6, which is characterized in that: the method comprises the following steps:
1) Spraying: mixing the ultra-long salt spray-resistant mildew-proof waterborne epoxy primer with a waterborne curing agent, spraying the mixture on a metal product or a metal plate of an aluminum product, and leveling the mixture for 10-15min;
2) And (3) drying: baking at 70-80deg.C for 45-60min, cooling to room temperature, and standing for 24-72 hr.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311577802.4A CN117402536A (en) | 2023-11-24 | 2023-11-24 | Super-long salt-fog-resistant mildew-proof waterborne epoxy primer as well as preparation method and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311577802.4A CN117402536A (en) | 2023-11-24 | 2023-11-24 | Super-long salt-fog-resistant mildew-proof waterborne epoxy primer as well as preparation method and use method thereof |
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| CN117402536A true CN117402536A (en) | 2024-01-16 |
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| Country | Link |
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| CN (1) | CN117402536A (en) |
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