CN114989709B - Water-based precoating primer, coating and product with coating - Google Patents
Water-based precoating primer, coating and product with coating Download PDFInfo
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- CN114989709B CN114989709B CN202210691910.3A CN202210691910A CN114989709B CN 114989709 B CN114989709 B CN 114989709B CN 202210691910 A CN202210691910 A CN 202210691910A CN 114989709 B CN114989709 B CN 114989709B
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- 238000000576 coating method Methods 0.000 title claims abstract description 66
- 239000011248 coating agent Substances 0.000 title claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000002987 primer (paints) Substances 0.000 claims abstract description 81
- 229920002396 Polyurea Polymers 0.000 claims abstract description 58
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- 238000005422 blasting Methods 0.000 claims abstract description 14
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- 238000003466 welding Methods 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
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- 230000000704 physical effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 22
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- 239000010410 layer Substances 0.000 description 17
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- 239000005002 finish coating Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
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- 229910052751 metal Inorganic materials 0.000 description 5
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- 239000004970 Chain extender Substances 0.000 description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 2
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- 229910021641 deionized water Inorganic materials 0.000 description 2
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- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 229960005191 ferric oxide Drugs 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 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 2
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- 238000001308 synthesis method Methods 0.000 description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 2
- -1 0.08wt% Chemical class 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-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
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- 238000007599 discharging Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- XZUAPPXGIFNDRA-UHFFFAOYSA-N ethane-1,2-diamine;hydrate Chemical compound O.NCCN XZUAPPXGIFNDRA-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 239000013615 primer Substances 0.000 description 1
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- 239000006254 rheological additive Substances 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
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- 238000004381 surface treatment Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- 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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
-
- 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
- C09D5/24—Electrically-conducting 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
-
- 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
Abstract
The application provides a water-based precoating primer, a coating and a product with the coating, which belong to the technical field of coatings, wherein the water-based precoating primer is matched with polyurea finish for use, and the water-based precoating primer comprises: the first component comprises aqueous epoxy modified polyurethane resin, wherein the aqueous epoxy modified polyurethane resin contains epoxy groups and polyurethane groups. The aqueous precoating primer provided by the application uses the aqueous epoxy modified polyurethane resin as a base material, so that the adhesive force between the existing aqueous precoating primer and the polyurea finish paint coating can be effectively improved; the finishing agent has good matching usability with polyurea finish paint, and can be applied to a steel shot blasting pretreatment process before the steel is coated with the polyurea finish paint.
Description
Technical Field
The application relates to the technical field of coatings, in particular to a water-based precoating primer, a coating and a product with the coating.
Background
The polyurea finish paint coating is a coating with excellent wear resistance and impact resistance, which is prepared by spraying a polyurea elastomer material, and has good application prospect on railway vehicles. When the method is applied, the shot blasting rust removal treatment is carried out in the blanking stage of the steel, and a layer of water-based precoated primer is sprayed so as to provide short-term protection for the surface of the steel.
The conventional precoating primer used at present mainly comprises a water-based epoxy ester precoating primer, a water-based inorganic zinc-rich precoating primer and the like, but in the prior art, the adhesive force between the water-based precoating primer and the polyurea finish coating is poor.
Disclosure of Invention
The application aims to provide a water-based precoating primer, a coating and a product with the coating, which can effectively solve the problem of poor adhesive force of the existing water-based precoating primer and polyurea finish coating.
In a first aspect, an embodiment of the present application provides a water-based pre-priming paint, where the water-based pre-priming paint is used together with a polyurea finish, and the water-based pre-priming paint includes:
the first component comprises aqueous epoxy modified polyurethane resin, wherein the aqueous epoxy modified polyurethane resin contains epoxy groups and polyurethane groups.
Further, the aqueous epoxy modified polyurethane resin is obtained through a first chemical reaction, and the reaction raw materials of the first chemical reaction comprise, in parts by weight: 15-65 parts of polyether polyol, 10-75 parts of isocyanate and 1-10 parts of epoxy resin.
Further, the first component further comprises: and (3) filling.
Further, the filler comprises: fine silica powder, barium sulfate, and the like.
Further, the properties of the first component satisfy: fineness of 30 μm or less and/or viscosity of 2 to 10 Pa.S.
Further, the aqueous pre-primer further comprises:
and a second component comprising a metallic conductive material.
Further, the metal conductive substance is zinc powder.
Further, the mass ratio of the first component to the second component is (5-10): 2-5.
In a second aspect, embodiments of the present application provide a coating comprising:
a polyurea top coat layer;
a primer layer comprising the waterborne shop primer of any of claims 1 to 8, said polyurea top coat layer being applied to a surface of said primer layer remote from the substrate.
In a third aspect, embodiments of the present application provide an article having a coating, the article comprising a substrate, and a coating attached to at least a portion of a surface of the substrate, the coating being in accordance with the second aspect.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
the aqueous precoating primer provided by the embodiment of the application comprises aqueous epoxy modified polyurethane resin, wherein the aqueous epoxy modified polyurethane resin formed by reacting polyether polyol, isocyanate and epoxy resin is used as a base material, and the aqueous epoxy modified polyurethane resin contains epoxy groups and polyurethane groups: on one hand, the epoxy group has better wettability and permeability on the steel substrate and strong adhesive force; the polyurethane group contains isocyanate prepolymer similar to the polyurea structure in the polyurea finish paint coating, has good matching property with high polymer molecules in the polyurea structure, good compatibility and high bonding strength, can generate anchoring and biting action with the polyurea finish paint coating, and enhances the adhesive force with the polyurea finish paint coating. Namely, the aqueous precoating primer provided by the embodiment of the application uses the aqueous epoxy modified polyurethane resin as the base material, so that the adhesive force between the existing aqueous precoating primer and the polyurea finish coating can be effectively improved.
Detailed Description
The advantages and various effects of the present application will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the application, not to limit the application.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
The polyurea finish paint coating is a coating with excellent wear resistance and impact resistance, which is prepared by spraying a polyurea elastomer material, and has good application prospect on railway vehicles. When the method is applied, the conventional method is to adopt a surface treatment process of steel shot blasting pretreatment before the steel for the railway vehicle is coated with polyurea finish paint coating, namely: in the blanking stage of the steel, firstly, shot blasting rust removal treatment is carried out, and a layer of water-based precoated primer with weldability is sprayed so as to provide short-term protection for the surface of the steel and prevent the steel from being corroded during welding processing and assembly.
The conventional precoating primer used at present mainly comprises a water-based epoxy ester precoating primer, a water-based inorganic zinc-rich precoating primer and the like, but in the prior art, the adhesive force between the water-based precoating primer and a polyurea finish coating is poor, so that the existing water-based precoating primer and the polyurea finish coating are poor in matching property or compatibility. Specifically, the gel time of the polyurea finish paint coating is short, the curing speed is high, the surface tension is high, the wetting ability of the polyurea finish paint coating on the surfaces of substrates such as steel and the like and the existing water-based precoated primer is poor, and the adhesive force is low, so that after the existing water-based precoated primer is adopted for steel shot blasting pretreatment and the polyurea finish paint coating is directly coated, the adhesive force of the whole coating system is low, and the wear resistance and the impact resistance of the polyurea finish paint coating are affected to a certain extent. Therefore, the existing railway vehicle coating polyurea coating adopts the process flow of spraying the matched primer coating again, namely: shot blasting pretreatment of steel for railway vehicles, spraying conventional water-based epoxy precoating primer, vehicle body assembly welding forming, vehicle body surface spraying cleaning to remove precoating primer, spraying a layer of priming coating matched with the polyurea coating again, and spraying the polyurea finish coating. The existing whole polyurea coating process has high cost and low efficiency.
In view of the above, the present application provides a water-based precoating primer and application thereof, which can effectively solve the above problems existing in the existing water-based precoating primer.
The technical scheme provided by the embodiment of the application aims to solve the technical problems, and the overall thought is as follows: in one aspect, the embodiment of the application provides a water-based precoating primer, which is matched with polyurea finish for use, and comprises the following components:
the first component comprises aqueous epoxy modified polyurethane resin, wherein the aqueous epoxy modified polyurethane resin contains epoxy groups and polyurethane groups.
The aqueous precoating primer provided by the embodiment of the application comprises aqueous epoxy modified polyurethane resin, wherein the aqueous epoxy modified polyurethane resin is used as a base material, and the aqueous epoxy modified polyurethane resin contains epoxy groups and polyurethane groups: on one hand, the epoxy group has better wettability and permeability on substrates such as steel materials and the like and has strong adhesive force; the polyurethane group contains isocyanate prepolymer similar to the polyurea structure in the polyurea finish paint coating, has good matching property with high polymer molecules in the polyurea structure, good compatibility and high bonding strength, can generate anchoring and biting action with the polyurea finish paint coating, and enhances the adhesive force with the polyurea finish paint coating. Namely, the aqueous precoating primer provided by the embodiment of the application uses the aqueous epoxy modified polyurethane resin as the base material, so that the adhesive force between the existing aqueous precoating primer and the polyurea finish coating can be effectively improved. Therefore, the water-based precoating primer and the polyurea finish paint coating provided by the embodiment of the application have good matching usability, and can be applied to a steel shot blasting pretreatment process before the steel is coated with the polyurea finish paint coating.
As an embodiment of the present application, the aqueous epoxy modified polyurethane resin is obtained by a first chemical reaction, and the reaction raw materials of the first chemical reaction include, in parts by weight: 15-65 parts of polyether polyol, 10-75 parts of isocyanate and 1-10 parts of epoxy resin.
The types of the polyether polyol, isocyanate and epoxy resin mentioned above are not particularly limited, and they are only required to give the resultant aqueous epoxy-modified polyurethane resin having an epoxy group and a polyurethane group. The weight parts of the polyether polyol, the isocyanate and the epoxy resin meet the above range, namely: (15-65) and (10-75) in (1-10), the ratio of epoxy groups and polyurethane groups in the aqueous epoxy modified polyurethane resin is more suitable, and the adhesive force of the existing aqueous precoating primer and polyurea finish coating can be further effectively improved.
In some embodiments, the ratio of the polyether polyol, the isocyanate, and the epoxy resin may be 15:20:2, 20:30:3, 45:50:5, 60:70:8, etc. The polyether polyols include, but are not limited to, polyether polyol N204, polyether polyol N210, polyether polyol N220, polyether polyol N240, polyether polyol N280, polyether polyol N303F, polyether polyol N305, polyether polyol N306, polyether polyol N307, polyether polyol N330, other suitable polyether polyols, or any mixture of the above; the term isocyanate is understood to mean the totality of the various esters of isocyanate, including mono-and di-and polyisocyanates, etc., in particular toluene diisocyanate TDI-80, isocyanate MDI-50, other suitable isocyanates, or any mixture of the above; the epoxy resin includes, but is not limited to, epoxy resin E44, epoxy resin E51, other suitable epoxy resins, solutions of the above epoxy resins, or any mixtures of the above.
As an implementation of the embodiment of the present application, the first component further includes: and (3) filling.
The filler can be added appropriately according to the water-based precoated primer disclosed in the prior art and the actual requirement, such as adding silica micropowder, iron oxide red and the like, so as to improve the anti-corrosion performance and the filling property of the water-based precoated primer.
As an implementation of the embodiment of the present application, the first component further includes: a non-metallic conductive material.
The nonmetallic conductive substance has the effects of improving the conductivity of the water-based precoated primer after film formation, being beneficial to the welding processing and forming of subsequent steel, and effectively improving the weldability of the existing water-based precoated primer; specifically, the material can be graphene, carbon nano tube and other nonmetallic conductive substances.
As an implementation of the embodiment of the present application, the properties of the first component satisfy: fineness of 30 μm or less and/or viscosity of 2 to 10 Pa.S.
As an implementation of the embodiment of the present application, the aqueous pre-primer further includes:
and a second component comprising a metallic conductive material.
The second component, including metal conductive material, is used to match with non-metal conductive material in the first component, further improves the conductivity of the water-based precoated primer after film formation, so that the water-based precoated primer can be directly welded to steel without removal, and can adapt to various manual welding and automatic welding processes, the mechanical property and forming of the welding seam are not affected, and the welding seam position does not generate air holes, thereby effectively avoiding the problem of poor welding adaptability of the existing water-based precoated primer.
As an implementation of the embodiment of the present application, the metal conductive material is zinc powder.
The zinc powder has the following functions: on one hand, the problem of poor weldability of the existing water-based precoated primer can be effectively solved; on the other hand, zinc powder plays a role in corrosion prevention, and under the action of the sacrificial anode, zinc plays a role in protecting a steel substrate by a sealing layer on a plating layer, so that the corrosion resistance of the water-based precoated primer is improved. The zinc powder may be greater than 800 mesh zinc powder.
As an implementation mode of the embodiment of the application, the mass ratio of the first component to the second component is (5-10): 2-5.
The reason why the mass ratio of the first component to the second component is (5-10): 2-5 is that the paint film has good adhesive force, corrosion resistance and weldability, and good matching property with the polyurea coating, the adverse effect of the excessive ratio is poor in weldability, the adverse effect of the excessive ratio is poor in paint film adhesive force, poor in corrosion resistance and poor matching property with the polyurea coating. The mass ratio of the first component to the second component may be specifically 5:2,7:2,7:3,8:3, 10:3, etc., preferably 7:3.
It should be noted that:
(1) The reaction process of the first chemical reaction may be appropriately added with a neutralizing agent and a catalyst according to a conventional synthesis method of an aqueous epoxy-modified polyurethane resin in the prior art and actual needs, and the neutralizing agent is not particularly limited. The neutralizer is only used for neutralizing the obtained product waterborne epoxy modified polyurethane resin into salt, so that the subsequent preservation is facilitated; the catalyst is selected, for example, from dibutyltin dilaurate in order to initiate the reaction. The amounts of the neutralizing agent and the catalyst may be appropriately selected according to the amounts of the reaction raw materials, so as to promote the reaction of the polyether polyol, the isocyanate and the epoxy resin to produce the aqueous epoxy-modified polyurethane resin. If the amount of the polyether polyol as the reaction raw material is based on the amount of the polyether polyol, the catalyst amount may be selected to be 0.005 to 0.1wt% such as 0.08wt%, 0.01wt%, 0.011wt%, 0.05wt%, 0.08wt% and the like of the amount of the polyether polyol; the amount of neutralizing agent may be selected to be 0.005 to 0.1wt% of the amount of polyether polyol, such as 0.08wt%, 0.01wt%, 0.011wt%, 0.05wt%, 0.08wt%, etc.
In addition, a chain extender and a capping agent can be added to the reaction conditions of the first chemical reaction to further modify the aqueous epoxy-modified polyurethane resin, and the types of the chain extender and the capping agent used are not particularly limited, and only the aqueous epoxy-modified polyurethane resin of the obtained product can still retain epoxy groups and polyurethane groups. The reaction temperature and the reaction time can be properly selected according to the disclosure of the conventional synthesis method of the waterborne epoxy modified polyurethane resin in the prior art, for example, the reaction temperature is selected to be 75-90 ℃, and the reaction temperature can be specifically selected to be 75 ℃, 78 ℃, 80 ℃, 81 ℃, 82 ℃, 85 ℃, 88 ℃, 90 ℃ and the like; the reaction time is 2-5h, and can be specifically 2h, 2.5h, 3h, 3.5h, 4h, 5h, etc.
(2) The first component can be added with an auxiliary agent, a solvent and other fillers except for metal conductive substances according to the aqueous precoated primer and the actual requirement disclosed in the prior art, so that the aqueous epoxy modified polyurethane resin base material can be uniformly dispersed in the solvent, and the convenience and the operability of the aqueous precoated primer in spray application are improved. Preferably, the auxiliary agents include dispersants, defoamers and rheology aids, and the fillers other than the metal conductive material include fine silica powder and red iron oxide.
Based on the same inventive concept, the embodiment of the present application further provides a coating layer, including:
a polyurea top coat layer;
and the primer layer comprises the water-based precoating primer, and the polyurea top-coat layer is coated on the surface of the primer layer, which is far away from the base substrate.
According to the coating provided by the embodiment of the application, on one hand, the primer layer comprising the water-based precoating primer has excellent adhesive force and anti-corrosion performance with a substrate such as steel; on the other hand, the primer layer and the polyurea finish layer have excellent adhesive force and compatibility. Therefore, when the whole coating is applied to a base material such as steel, the coating not only has excellent wear resistance, impact resistance and other performances brought by a polyurea finish layer, but also has excellent adhesive force, and the specific adhesive force can reach more than 8 MPa.
Based on the same inventive concept, the embodiments of the present application also provide an article having a coating, the article comprising a substrate, and a coating attached to at least a portion of a surface of the substrate, the coating being a coating according to the second aspect.
The water-based precoated primer provided by the embodiment of the application is matched with polyurea finish paint for use, so that when the water-based precoated primer is applied to steel substrates and ceramic substrates as an anti-corrosion coating, the existing process flow can be simplified, the production efficiency can be improved, and the production cost can be reduced. In some specific embodiments, such as in the process of coating a polyurea top coat coating on a railway vehicle, compared with the conventional process method of coating a polyurea top coat coating on a railway vehicle, the process of cleaning and removing the pre-priming paint and spraying a primer coating matched with the polyurea top coat coating again is not needed after the vehicle body is assembled and welded, namely: steel ball blasting pretreatment, spraying the water-based precoated primer provided by the embodiment of the application, vehicle body assembly welding forming, vehicle body surface oil removal, dust removal and cleaning, and spraying a polyurea finish coating. Simplifying the process flow, improving the coating efficiency of the polyurea coating of the railway wagon and reducing the cost.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
Preparing a water-based precoated primer, comprising:
preparing aqueous epoxy modified polyurethane resin:
adding the dried polyether polyol N220 (45 parts) into a flask according to the parts by weight, putting the flask into an electronic constant-temperature water bath kettle, keeping the temperature of 80 ℃ unchanged, and opening nitrogen for protection; then after the temperature of the polyether polyol is 80 ℃, dropwise adding isocyanate MDI-50 (50 parts) into the flask, reacting for a period of time, adding epoxy resin E44 (5 parts) dissolved in N-methylpyrrolidone (2 parts), and stirring at a constant speed; then dibutyl tin dilaurate (0.5 part) is added, the temperature is increased to 85 ℃, and the mixture is stirred at constant speed for 3 hours; after the reaction is finished, cooling to room temperature, adding a neutralizing agent triethylamine (1 part), stirring for 30min at the rotating speed of 1000-1200 r/min, shearing and emulsifying, and dispersing in an ethylenediamine water solution to obtain the waterborne epoxy modified polyurethane resin.
Preparing a first component:
according to the mass portion, the prepared waterborne epoxy modified polyurethane resin (20 portions), deionized water (15 portions), dispersing agent (1 portion), defoamer (0.2 portion), nonmetallic conductive substance (0.2 portion), silicon micropowder (5 portions) and ferric oxide red (10 portions) are sequentially put into a dispersing tank, and the materials are uniformly dispersed and then ground until the fineness is less than or equal to 30 mu m; then adding rheological additive (0.2 part) into the medium ground material, uniformly stirring, filtering to remove impurities, adjusting the viscosity of the filtered material to 2-10 Pa.S, filtering again to remove impurities, and discharging to obtain a first group of components; wherein the dispersant is a polymeric nonionic aqueous dispersant such as ADDITTOLVXW 6208/60; the defoamer is an organosilicon aqueous defoamer, such as an organosilicon defoamer F-202; the rheology aid is an associative polyurethane thickener such as RHEOLATE299 aqueous rheology aid; the nonmetallic conductive substance is graphene powder.
Preparing a second component:
the second component is 1000 mesh zinc powder (100 parts) filled product, which is purchased directly from Hunan Xinweiling New Material technology Co.
The mass ratio of the first component to the second component in the water-based precoated primer is 5:2.
When the water-based precoated primer is used for construction, the water-based precoated primer can be applied to a base material such as steel by adopting modes such as airless spraying, brushing, roller coating and the like, and is cured to form a film at a temperature of 5-35 ℃, and the thickness of a dry film after the film forming is controlled within 20 mu m. The actual drying time is less than or equal to 5 minutes, and the production rhythm of the shot blasting pretreatment assembly line can be satisfied; the environment-friendly type paint is environment-friendly, and the VOC content is lower than 100g/L.
Examples 2 to 8 were identical to the preparation method of the aqueous pre-primer of example 1, except that: 1) The mass ratio of the polyether polyol m1, the isocyanate m2, and the epoxy resin m3 in the aqueous epoxy-modified polyurethane resins used in examples 2 to 4 was 15:20:2 (15 parts by mass: 20 parts by mass: 2 parts by mass), 20:30:3 (20 parts by mass: 30 parts by mass: 3 parts by mass), and 60:70:8 (60 parts by mass: 70 parts by mass: 8 parts by mass), respectively; the mass ratio of the first component to the second component in example 3 was 7:2; 2) The mass ratio of the aqueous epoxy-modified polyurethane resin, deionized water, and nonmetallic electroconductive material used in the first composition of examples 5 to 7 was 30:20:20 (30 parts by mass: 20 parts by mass), 40:22:48 (40 parts by mass: 22 parts by mass: 48 parts by mass), and 60:25:60 (60 parts by mass: 25 parts by mass: 60 parts by mass), respectively; the mass ratio of the first component to the second component in example 6 was 7:3; the mass ratio of the first component to the second component in example 7 was 8:3; 3) The mass ratio of the first component to the second component in example 8 was 10:3.
Comparative example 1
This example provides a waterborne epoxy precoated primer which differs from example 1 only in that: the aqueous epoxy modified polyurethane resin (20 parts) is adjusted to be commercial aqueous epoxy phosphate resin and commercial aqueous acrylic modified epoxy resin with the mass part ratio of 2:1; the rest steps and parameters are the same.
Test examples
The water-based precoated primer prepared in the examples 1-9 is applied to a process of ball blasting pretreatment and polyurea coating spraying of steel for railway vehicles, and comprises the following steps:
shot blasting pretreatment of steel for railway vehicles;
spraying the water-based precoated primer prepared in the examples 1-9 on the surface of the treated steel for the railway vehicle respectively, and controlling the dry film thickness within 20 mu m after curing and film forming;
performing vehicle body assembly welding forming on the steel for the railway vehicle after being sprayed with the water-based precoated primer;
oil removal and dust removal cleaning are carried out on the surface of the vehicle body, and then a polyurea finish paint coating (the model of the polyurea paint is Lu Mengpai-SPUA 906);
and detecting the overall performance of the obtained coating, wherein the adhesive force test refers to a pull-open method in GB/T5210, the neutral salt spray resistance test refers to GB/T1771, and the wear resistance test refers to GB/T1768-2006.
The specific data are shown in table 1.
TABLE 1 coating integrity test results
As can be seen from Table 1, the aqueous pre-priming paint and the polyurea finish paint of the application have good matching property or adaptability; meanwhile, after the water-based precoated primer is adopted to perform steel ball blasting pretreatment and is coated with a polyurea finish paint coating, the adhesive force of the whole coating system is not lower than 8MPa, and the whole coating system has good performances such as wear resistance and the like. Meanwhile, the water-based precoated primer meets the requirements of high precoated primer drying speed and good weldability: in terms of drying speed, the real drying time is less than or equal to 5 minutes, the production rhythm of a shot blasting pretreatment assembly line can be met, and the steel can be directly piled after being taken off line; in terms of weldability, the thickness of the dry film is controlled within 20 mu m, and the dry film can be suitable for various manual welding and automatic welding processes, the mechanical property and the forming of a welding line are not affected, and air holes are not generated at the position of the welding line. Green and environment-friendly: the VOC content of the coating is not more than 100g/L.
Finally, it is further noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. Use of a waterborne shop primer, comprising:
shot blasting pretreatment of steel for railway vehicles;
spraying water-based precoating primer on the surface of steel for railway vehicles, and controlling the dry film thickness within 20 mu m after curing and film forming;
performing vehicle body assembly welding forming on the steel for the railway vehicle after being sprayed with the water-based precoated primer;
oil removal and dust removal cleaning are carried out on the surface of the vehicle body, and then a polyurea finish paint coating is sprayed;
the aqueous precoating primer includes:
a first component comprising a waterborne epoxy modified polyurethane resin, the waterborne epoxy modified polyurethane resin containing epoxy groups and polyurethane groups, the physical properties of the first component satisfying: the fineness is less than or equal to 30 mu m, and the viscosity is 2-10Pa s;
a second component comprising a metallic conductive material;
the mass ratio of the first component to the second component is (5-10): 2-5; the waterborne epoxy modified polyurethane resin is obtained through a first chemical reaction, and the reaction raw materials of the first chemical reaction comprise, in parts by weight: 15-65 parts of polyether polyol, 10-75 parts of isocyanate and 1-10 parts of epoxy resin.
2. The use of a waterborne shop primer according to claim 1, wherein the first component further comprises: and (3) filling.
3. The use of a waterborne shop primer according to claim 2, wherein the filler comprises: a non-metallic conductive material.
4. The use of a waterborne shop primer according to claim 1, wherein the metallic conductive substance is zinc powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210691910.3A CN114989709B (en) | 2022-06-17 | 2022-06-17 | Water-based precoating primer, coating and product with coating |
| PCT/CN2022/137278 WO2023240946A1 (en) | 2022-06-17 | 2022-12-07 | Water-based prefabrication primer, coating, and product with coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210691910.3A CN114989709B (en) | 2022-06-17 | 2022-06-17 | Water-based precoating primer, coating and product with coating |
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| WO2023240946A1 (en) | 2023-12-21 |
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