CN114891420A - Weather-proof anticorrosive paint, and preparation method and protection method thereof - Google Patents

Weather-proof anticorrosive paint, and preparation method and protection method thereof Download PDF

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Publication number
CN114891420A
CN114891420A CN202210697848.9A CN202210697848A CN114891420A CN 114891420 A CN114891420 A CN 114891420A CN 202210697848 A CN202210697848 A CN 202210697848A CN 114891420 A CN114891420 A CN 114891420A
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weather
resistant
coating
emulsifier
polyester
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CN114891420B (en
Inventor
周胜蓝
谢文才
李孟华
张靖
牛治宇
肖丽娟
尹赫
黄天宇
赵振声
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FAW Jiefang Automotive Co Ltd
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FAW Jiefang Automotive Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/542—No clear coat specified the two layers being cured or baked together
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2301/00—Inorganic additives or organic salts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2320/00—Organic additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2508/00—Polyesters
    • 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
    • C08K2003/0862—Nickel
    • 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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation

Abstract

The invention relates to a weather-resistant anticorrosive coating, a preparation method and a protection method thereof. The weather-resistant anticorrosive coating comprises the following components in parts by weight: 1-5 parts of metal chelate, 20-30 parts of modified polyester epoxy binder, 20-30 parts of pigment, 25-30 parts of filler and 5-10 parts of cosolvent; the modified polyester epoxy binder comprises polyester, epoxy resin, an emulsifier and water, wherein the mass ratio of the polyester to the epoxy resin to the emulsifier to the water is (20-30) to (30-40) to (5-10) to (10-20). The weather-proof anticorrosive coating has excellent secondary corrosion resistance after weather-proof test, the secondary salt spray test reaches more than 500 hours after the weather-proof test for 1000 hours, and the weather-proof anticorrosive coating can be used for weather-proof corrosion-proof protection of a steering system of an off-road vehicle. Meanwhile, the weather-resistant anticorrosive coating also has the advantages of excellent metal surface adhesive force, stone impact resistance and the like.

Description

Weather-proof anticorrosive paint, and preparation method and protection method thereof
Technical Field
The invention relates to the field of coatings, in particular to a weather-resistant anticorrosive coating, a preparation method and a protection method thereof.
Background
The steering system is used as an important transmission system of a vehicle, and if local corrosion occurs, a fatigue source can be formed, and further component breakage can occur. Therefore, the weather resistance and corrosion resistance of the protective coating of the steering system are required to be high. Especially for a steering system of an off-road vehicle, the requirement on the secondary corrosion resistance after salt spray resistance and weather resistance tests is very high, for example, the requirement of the international standard is that the secondary salt spray resistance test can reach more than 500 hours after the weather resistance test of 1000 hours, and a paint film after the test has no obvious color change, chalking, light loss or luster increase, and has no obvious change in mechanical properties.
However, the protective effect of the corrosion-resistant and weather-resistant coating which is commonly used at present is not ideal. The coating is a traditional durable coating or an antirust coating, and the color change is serious after a weather resistance test, so that the requirements of high weather resistance and high corrosion resistance of the coating of the steering system of the off-road vehicle can not be met.
Disclosure of Invention
Therefore, it is necessary to provide a weather-resistant anticorrosive coating, a preparation method thereof and a protection method thereof, so as to improve the weather-resistant and corrosion-resistant effects.
One of the purposes of the invention is to provide a weather-resistant anticorrosive coating, which adopts the following scheme:
the weather-resistant anticorrosive coating comprises the following components in parts by weight:
Figure BDA0003703413210000011
Figure BDA0003703413210000021
the modified polyester epoxy binder comprises polyester, epoxy resin, an emulsifier and water, wherein the mass ratio of the polyester to the epoxy resin to the emulsifier to the water is (20-30) to (30-40) to (5-10) to (10-20).
Compared with the traditional scheme, the weather-resistant anticorrosive coating has the following beneficial effects:
the weather-resistant anticorrosive paint comprises a modified polyester epoxy adhesive, wherein the modified polyester epoxy adhesive comprises polyester, epoxy resin, an emulsifier and water in a specific ratio, the polyester and the epoxy resin are emulsified and then matched with a metal chelate, a pigment, a filler and a cosolvent, the weather-resistant anticorrosive paint has excellent corrosion-resistant secondary performance after a weather-resistant test, the secondary salt spray test reaches more than 500 hours after a weather-resistant test for 1000 hours, and the weather-resistant anticorrosive paint can be used for weather-resistant corrosion-resistant protection of a steering system of a cross-country vehicle. Meanwhile, the weather-resistant anticorrosive coating also has the advantages of excellent metal surface adhesive force, stone impact resistance and the like, and has excellent comprehensive performance.
In one embodiment, the metal chelate is selected from at least one of a bio-based metal chelate, nitrilotriacetic acid disodium salt, ethylenediaminetetraacetic acid tetrasodium salt, dithiocarbamate, and xanthate chelate.
In one embodiment, the epoxy resin has an epoxy equivalent weight of 175 to 200.
In one embodiment, the filler is selected from at least one of talc, nickel powder, and zinc powder.
In one embodiment, the co-solvent is selected from at least one of an ester solvent and a ketone solvent.
In one embodiment, the cosolvent is a mixture of ethyl acetate and acetone in a mass ratio of (2-3): (1-2).
In one embodiment, the emulsifier is at least one selected from OP-10, SP-60 and sodium dodecyl benzene sulfonate.
In one embodiment, the emulsifier is a mixture of OP-10, SP-60 and sodium dodecyl benzene sulfonate in a mass ratio of (10-14) to (1-2) to (2-3).
Another object of the present invention is to provide a method for preparing the weather-resistant anticorrosive coating according to any of the above embodiments, wherein the scheme is as follows:
the preparation method of the weather-resistant anticorrosive coating comprises the following steps:
mixing the polyester and the epoxy resin to obtain mixed resin;
adding an emulsifier into the mixed resin, dropwise adding water, and stirring at 80-90 ℃ for 40-60min to obtain the modified polyester epoxy binder;
and stirring and mixing the modified polyester epoxy adhesive, the metal chelate, the pigment, the filler and the cosolvent.
According to the preparation method of the weather-resistant anticorrosive coating, polyester and epoxy resin are emulsified to obtain a modified polyester epoxy adhesive which comprises the polyester, the epoxy resin, an emulsifier and water in a specific proportion, and then the modified polyester epoxy adhesive is matched with a metal chelate, a pigment, a filler and a cosolvent, so that the obtained coating has excellent corrosion-resistant secondary performance after a weather-resistant test, the secondary salt spray test reaches more than 500 hours after a weather-resistant test for 1000 hours, and the weather-resistant anticorrosive coating can be used for weather-resistant corrosion-resistant protection of a steering system of a cross-country vehicle. Meanwhile, the weather-resistant anticorrosive coating also has the advantages of excellent metal surface adhesive force, stone impact resistance and the like, and has excellent comprehensive performance.
Another object of the present invention is to provide a protection method, wherein the scheme is as follows:
a method of safeguarding comprising the steps of:
step 1, performing shot blasting on a workpiece;
step 2, coating an antirust coating on the workpiece;
and 3, coating the weather-resistant anticorrosive paint of any embodiment on the basis of the antirust coating, and drying and curing.
The protection method can carry out long-acting weather-proof anti-corrosion protection on the metal surface.
Drawings
Fig. 1 is a standard picture of the value (grade) division of the stone-strike resistance performance characteristic;
FIG. 2 is a photograph of a protective condition in a practical use test of a steering system of an off-road vehicle using the weather-resistant anticorrosive coating of example 1;
FIG. 3 is a photograph of a protective condition using a conventional waterborne epoxy coating in a practical application test of a steering system of an off-road vehicle.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The weather-resistant anticorrosive coating provided by the embodiment of the invention comprises the following components in parts by weight:
Figure BDA0003703413210000041
the modified polyester epoxy adhesive comprises polyester, epoxy resin, an emulsifier and water. The mass ratio of the polyester to the epoxy resin to the emulsifier to the water is (20-30) to (30-40) to (5-10) to (10-20).
The weather-resistant anticorrosive paint comprises a modified polyester epoxy binder, wherein the modified polyester epoxy binder comprises polyester, epoxy resin, an emulsifier and water in a specific ratio, the polyester and the epoxy resin are emulsified and then matched with a metal chelate, a pigment, a filler and a cosolvent, so that the weather-resistant anticorrosive paint has excellent corrosion-resistant secondary performance after a weather-resistant test, the secondary salt spray test reaches more than 500 hours after a weather-resistant test for 1000 hours, and the weather-resistant anticorrosive paint can be used for weather-resistant corrosion-resistant protection of a steering system of a cross-country vehicle. Meanwhile, the weather-resistant anticorrosive coating also has the advantages of excellent metal surface adhesive force, stone impact resistance and the like, and has excellent comprehensive performance.
The invention aims to provide a protective coating applied to a steering system part of an off-road vehicle and a coating process thereof, which aims to improve the coating quality level of the domestic off-road vehicle, eliminate the existing coating quality problem, reduce the quality gap with the imported off-road vehicle, improve the bonding strength of the protective coating on the metal surface by more than 60 percent, and have excellent ultraviolet resistance, corrosion resistance and the function of combining three-high environment. The bonding strength of the steering protection coating on the metal surface is improved, and the steering protection coating has excellent weather resistance and corrosion resistance.
In one example, the weather-resistant and corrosion-resistant coating comprises the following components in parts by weight:
Figure BDA0003703413210000051
the metal chelate is a compound which is stable and has a larger molecular weight by including metal ions in the chelating agent through the strong binding action of the chelating agent molecules and the metal ions.
Optionally, the metal chelate is selected from at least one of a bio-based metal chelate, nitrilotriacetic acid disodium salt, ethylenediaminetetraacetic acid tetrasodium salt, dithiocarbamate and xanthate chelate.
The dosage range of the metal chelate is 1-5 parts, the dosage of the metal chelate is too small, a compound film on the surface of the metal is incomplete, weather resistance and corrosion resistance are poor, and the dosage is too large, so that the film forming of the coating is influenced, and the storage stability of the coating is influenced.
In one example, a method of preparing a modified polyester epoxy adhesive includes the steps of:
and mixing the polyester and the epoxy resin to obtain the mixed resin. And adding an emulsifier into the mixed resin, and emulsifying the mixed resin by adopting a phase inversion emulsification method. More specifically, after the emulsifier is added, water is dripped while stirring, and the mixture is stirred for 40-60min at the temperature of 80-90 ℃ to obtain the modified polyester epoxy adhesive.
Wherein, the water is preferably deionized water.
Alternatively, the epoxy resin can be selected from but not limited to at least one of bisphenol a type epoxy resin and glycidyl ether type epoxy resin, such as E51, E44, E6101, and the like.
In one example, the epoxy resin has an epoxy equivalent of 175 to 200.
Alternatively, the polyester is a polymer formed by polycondensation of a polyol and a polyacid. The polyol may be, for example, a polyether polyol, and the polyacid may be, for example, oxalic acid.
In one example, the polyester is an unsaturated polyester resin containing unsaturated double bonds.
In one example, the polyester is prepared by polycondensation of maleic anhydride, phosphorus phthalic anhydride, ethylene glycol, propylene glycol, diethylene glycol, and the like.
Further, the emulsifier is at least one selected from OP-10, SP-60 and sodium dodecyl benzene sulfonate.
In one example, the emulsifier is a mixture of OP-10, SP-60 and sodium dodecyl benzene sulfonate in a mass ratio of (10-14) to (1-2) to (2-3). The composite emulsifier can emulsify and disperse resin components well.
In one specific example, the emulsifier is a mixture of OP-10, SP-60 and sodium dodecyl benzene sulfonate in a mass ratio of 14: 2: 3.
In one example, the emulsion formed after the emulsification process has a particle size of 14-24 μm. The emulsion has the granularity within the range, good dispersion stability, easy formation of continuous and smooth paint film and good storage stability.
The pigment can be selected from but not limited to corrosion-resistant pigments, such as at least one of modified aluminum tripolyphosphate and carbon black; and a weather-resistant pigment such as at least one of phthalocyanine blue and phthalocyanine green.
Alternatively, the cosolvent may be selected from, but not limited to, ester solvents, ketone solvents, and the like.
In one example, the cosolvent is a mixture of ethyl acetate and acetone in a mass ratio of (2-3): (1-2). The composite solvent can disperse resin components quickly and well, and the stability of the coating is good. In one specific example, the cosolvent is a mixture of ethyl acetate and acetone in a mass ratio of 3: 2.
The curing agent of the weather-proof anticorrosive coating can be at least one selected from linoleic acid dimer, eleostearic acid dimer and aliphatic polyamine.
The mass ratio of the weather-resistant anticorrosive paint to the curing agent is (4-5) to (0.8-1).
The curing condition of the weather-resistant anticorrosive coating is that the weather-resistant anticorrosive coating is cured for 20-30 hours under the condition of 21-25 ℃, or cured for 20-30 minutes under the condition of 80-90 ℃.
Optionally, the filler may be selected from, but not limited to, at least one of talc, nickel powder, and zinc powder.
Further, the present invention also provides a method for preparing the weather-resistant and corrosion-resistant coating material, which comprises the following steps:
mixing polyester and epoxy resin to obtain mixed resin;
adding an emulsifier into the mixed resin, dropwise adding water, and stirring at 80-90 ℃ for 40-60min to obtain a modified polyester epoxy binder;
stirring and mixing the modified polyester epoxy adhesive, the metal chelate, the pigment, the filler and the cosolvent.
According to the preparation method of the weather-resistant anticorrosive coating, polyester and epoxy resin are emulsified to obtain a modified polyester epoxy adhesive which comprises the polyester, the epoxy resin, an emulsifier and water in a specific proportion, and then the modified polyester epoxy adhesive is matched with a metal chelate, a pigment, a filler and a cosolvent, so that the obtained coating has excellent corrosion-resistant secondary performance after a weather-resistant test, the secondary salt spray test reaches more than 500 hours after a weather-resistant test for 1000 hours, and the weather-resistant anticorrosive coating can be used for weather-resistant corrosion-resistant protection of a steering system of a cross-country vehicle. Meanwhile, the weather-resistant anticorrosive coating also has the advantages of excellent metal surface adhesive force, stone impact resistance and the like, and has excellent comprehensive performance.
Further, the invention also provides a protection method, which uses the weather-resistant anticorrosive paint. The protection method comprises the following steps:
step 1, performing shot blasting on a workpiece;
step 2, coating an antirust coating on the workpiece;
and 3, coating the weather-resistant anticorrosive paint of any one of the above examples on the basis of the antirust coating, and drying and curing.
The protection method can carry out long-acting weather-proof anti-corrosion protection on the metal surface.
In one example, the component of the anti-rust coating is phytate.
In one example, after shot peening, the workpiece is cleaned using compressed air.
The present invention will be further described with reference to specific examples and comparative examples, but the present invention is not limited to the specific examples.
The raw materials used in the following examples are commercially available, unless otherwise specified, and the raw materials used in the examples are commercially available.
Example 1
The embodiment provides a weather-resistant anticorrosive coating, and a preparation method thereof comprises the following steps:
step 1, 20 parts by weight of polyester and 35 parts by weight of epoxy resin are mixed to obtain a mixed resin. Wherein, the polyester is unsaturated polyester (which is prepared from maleic anhydride, phosphorus phthalic anhydride, ethylene glycol, propylene glycol, diethylene glycol and the like through polycondensation reaction), and the epoxy resin is E51.
And 2, emulsifying the mixed resin by adopting a phase inversion emulsification method. 6 parts by weight of an emulsifier was added to the mixed resin, and 15 parts by weight of water was added dropwise with stirring. Stirring the mixture for 60min at the temperature of 80 ℃ to obtain the modified polyester epoxy adhesive. Wherein the emulsifier is OP-10, SP-60 and sodium dodecyl benzene sulfonate with the mass ratio of 14: 2: 3.
And 3, stirring and mixing 24 parts by weight of modified polyester epoxy binder, 3 parts by weight of metal chelate, 20 parts by weight of pigment, 25 parts by weight of filler and 10 parts by weight of cosolvent uniformly to obtain the weather-resistant anticorrosive coating. Wherein the metal chelate is ethylenediamine tetraacetic acid tetrasodium salt, the pigment is carbon black, the filler is nickel powder, and the cosolvent is ethyl acetate and acetone with the ratio of 3: 2.
Example 2
The embodiment provides a weather-resistant anticorrosive coating, and a preparation method thereof comprises the following steps:
step 1, mixing 25 parts by weight of polyester and 40 parts by weight of epoxy resin to obtain a mixed resin. Wherein, the polyester is unsaturated polyester (which is prepared from maleic anhydride, phosphorus phthalic anhydride, ethylene glycol, propylene glycol, diethylene glycol and the like through polycondensation reaction), and the epoxy resin is E44.
And 2, emulsifying the mixed resin by adopting a phase inversion emulsification method. 10 parts by weight of an emulsifier was added to the mixed resin, and 20 parts by weight of water was added dropwise with stirring. Stirring the mixture for 60min at the temperature of 80 ℃ to obtain the modified polyester epoxy adhesive. Wherein the emulsifier is OP-10, SP-60 and sodium dodecyl benzene sulfonate with the mass ratio of 14: 2: 3.
And 3, stirring and mixing 30 parts by weight of modified polyester epoxy binder, 5 parts by weight of metal chelate, 20 parts by weight of pigment, 25 parts by weight of filler and 10 parts by weight of cosolvent, and uniformly stirring to obtain the weather-resistant anticorrosive coating. Wherein the metal chelate is nitrilotriacetic acid disodium salt, the pigment is carbon black, the filler is zinc powder, and the cosolvent is ethyl acetate and acetone in a ratio of 3: 2.
Example 3
The embodiment provides a weather-resistant anticorrosive coating, and a preparation method thereof comprises the following steps:
step 1, mixing 30 parts by weight of polyester and 30 parts by weight of epoxy resin to obtain a mixed resin. Wherein, the polyester is unsaturated polyester (which is prepared from maleic anhydride, phosphorus phthalic anhydride, ethylene glycol, propylene glycol, diethylene glycol and the like through polycondensation reaction), and the epoxy resin is E51.
And 2, emulsifying the mixed resin by adopting a phase inversion emulsification method. 6 parts by weight of an emulsifier was added to the mixed resin, and 15 parts by weight of water was added dropwise with stirring. Stirring the mixture for 60min at the temperature of 80 ℃ to obtain the modified polyester epoxy adhesive. Wherein the emulsifier is OP-10, SP-60 and sodium dodecyl benzene sulfonate with the mass ratio of 14: 2: 3.
And 3, stirring and mixing 20 parts by weight of modified polyester epoxy binder, 1 part by weight of metal chelate, 20 parts by weight of pigment, 25 parts by weight of filler and 10 parts by weight of cosolvent, and uniformly stirring to obtain the weather-resistant anticorrosive paint. Wherein the metal chelate is ethylenediamine tetraacetic acid tetrasodium salt, the pigment is phthalocyanine blue, the filler is zinc powder, and the cosolvent is ethyl acetate and acetone in a ratio of 3: 2.
Example 4
This example is substantially the same as example 1, except that: in step 3, the addition amount of the modified polyester epoxy adhesive is 20 parts and the addition amount of the metal chelate is 1 part.
Example 5
This example is substantially the same as example 1, except that: in step 3, the addition amount of the modified polyester epoxy adhesive is 28 parts, and the addition amount of the metal chelate is 4 parts.
Comparative example 1
This comparative example differs from example 1 in that: the coating is not added with metal chelate.
Comparative example 2
This comparative example differs from example 1 in that: step 2 is not carried out, namely, the mixed resin is not subjected to emulsification treatment, and the resin and the metal chelate are directly blended.
Comparative example 3
This comparative example differs from example 1 in that: in step 1, the resin component is only an epoxy resin.
Comparative example 4
This comparative example differs from example 1 in that: in step 1, the resin component is only polyester.
The coating experiments of the coatings prepared in the above examples 1 to 5 and comparative examples 1 to 4 were carried out by the following steps:
and carrying out shot blasting on the metal workpiece.
And cleaning the metal workpiece by using compressed air.
Coating a high-molecular antirust coating and drying by compressed air.
Spraying the weather-resistant anticorrosive paint, keeping the temperature at 80 ℃ for 20 minutes, and cooling at normal temperature. After being placed at room temperature for 72 hours, the thickness of the coating is 15-20 mu m through detection.
The above samples were subjected to the following experiments.
Secondary performance test of corrosion resistance after weather resistance test:
three samples were made per group and subjected to an artificial accelerated weathering test (according to GB/T1865-2009). After 1000 hours of holding, the samples were taken for the neutral salt spray test (according to GB/T1771-2007). Observing whether the coating has the phenomena of cracking, rusting, color change, falling off and the like, and recording the effective corrosion prevention time.
And (3) adhesion test:
testing according to GB/T9286-88.
And (3) stone impact resistance test:
step 1, connecting the stone impact instrument to a compressed air pipeline or a compressed air bottle. And (3) enabling the detected paint template to face the gravel outlet of the stone impact instrument to be detected, fixing the detected paint template on the clamp frame, and screwing.
And 2, opening a valve of the compressed air conduit, and regulating the released air flow to a pressure gauge to display the pressure of 0.2MPa by a pressure reducing valve.
And 3, weighing 500g of angular steel shots, and uniformly filling the angular steel shots into a funnel. The steel shot is gathered by the air current and sprayed on the detection surface. Thereafter, the compressed air valve was closed and the shot collected in the collection funnel. Step 3 was repeated twice.
And 4, completely and firmly sticking the wounded surface by using an adhesive tape with the length of 12-15 cm, pressing (pressing by using a plastic scraper or a cam and the like), and upwards bending the residual tail adhesive tape. Then, the tape was pulled violently in the direction perpendicular to the test panel to bring the damaged portion of the paint film off the coated surface.
The stone chip resistance characteristic value (grade) was evaluated with reference to fig. 1.
And (3) hardness test:
according to GB/T6739-96 (Keniger pendulum).
Coating solvent resistance test:
a1-hour spot test was carried out at 23 ℃ using acetone solvent, and the appearance of the coating was observed for significant changes.
The engine oil resistance test of the coating:
the coating was observed to have a significant change in appearance in a 16 hour spot test using a passenger car engine oil (SG10W/30) at 23 ℃.
Acid resistance test:
a4-hour spot test was carried out at 23 ℃ using a 0.05mol/L sulfuric acid solution, and the coating was observed for a significant change in appearance.
Alkali resistance performance test:
a4-hour spot test was carried out at 23 ℃ using 0.1mol/L sodium hydroxide solution, and the coating was observed for a significant change in appearance.
The results of the experimental tests are shown in table 1.
TABLE 1
Figure BDA0003703413210000131
Practical application test of steering system of off-road vehicle
The weather-resistant anticorrosive paint of example 1 and the conventional water-based epoxy paint were applied to a steering system, respectively, and mounted on two off-road vehicles, and a road test was performed simultaneously. The protection of the steering system coating of two off-road vehicles was examined after a range of 50000 km.
The protection of the steering system coating of two off-road vehicles after the 50000km test is shown in figures 2 and 3. As can be seen from FIG. 2, the steering system protected with the weather-resistant anticorrosive coating of example 1 did not undergo significant discoloration, peeling, and rusting. As can be seen from fig. 3, significant discoloration, partial peeling, and rust generation have occurred in the steering system (portion within the dotted frame) treated with the conventional protective coating.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (10)

1. The weather-resistant anticorrosive coating is characterized by comprising the following components in parts by weight:
Figure FDA0003703413200000011
the modified polyester epoxy binder comprises polyester, epoxy resin, an emulsifier and water, wherein the mass ratio of the polyester to the epoxy resin to the emulsifier to the water is (20-30) to (30-40) to (5-10) to (10-20).
2. The weather resistant anticorrosive coating according to claim 1, wherein the metal chelate compound is at least one selected from the group consisting of a bio-based metal chelate compound, nitrilotriacetic acid disodium salt, ethylenediaminetetraacetic acid tetrasodium salt, dithiocarbamate and xanthate chelate compounds.
3. The weather-resistant anticorrosive coating according to claim 1, wherein the epoxy resin has an epoxy equivalent of 175 to 200.
4. The weather-resistant anticorrosive coating according to claim 1, wherein the filler is at least one selected from the group consisting of talc, nickel powder and zinc powder.
5. The weather-resistant anticorrosive coating according to any one of claims 1 to 4, wherein the co-solvent is at least one selected from ester solvents and ketone solvents.
6. The weather-resistant anticorrosive paint according to claim 5, wherein the cosolvent is a mixture of ethyl acetate and acetone in a mass ratio of (2-3) to (1-2).
7. The weather-resistant anticorrosive coating according to any one of claims 1 to 4 and 6, wherein the emulsifier is at least one selected from the group consisting of OP-10, SP-60 and sodium dodecylbenzenesulfonate.
8. The weather-resistant and corrosion-resistant coating according to claim 7, wherein the emulsifier is a mixture of OP-10, SP-60 and sodium dodecylbenzenesulfonate in a mass ratio of (10-14) to (1-2) to (2-3).
9. The method for preparing the weather-resistant and corrosion-resistant coating according to any one of claims 1 to 8, comprising the steps of:
mixing the polyester and the epoxy resin to obtain mixed resin;
adding an emulsifier into the mixed resin, dropwise adding water, and stirring at 80-90 ℃ for 40-60min to obtain the modified polyester epoxy binder;
and stirring and mixing the modified polyester epoxy adhesive, the metal chelate, the pigment, the filler and the cosolvent.
10. A method of protection, comprising the steps of:
step 1, performing shot blasting on a workpiece;
step 2, coating an antirust coating on the workpiece;
and 3, coating the weather-resistant anticorrosive paint according to any one of claims 1 to 8 on the basis of the antirust coating, and drying and curing the paint.
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