CN116102949B - High-performance protective paint and paint spraying process thereof - Google Patents
High-performance protective paint and paint spraying process thereof Download PDFInfo
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- CN116102949B CN116102949B CN202211678463.4A CN202211678463A CN116102949B CN 116102949 B CN116102949 B CN 116102949B CN 202211678463 A CN202211678463 A CN 202211678463A CN 116102949 B CN116102949 B CN 116102949B
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- 239000002519 antifouling agent Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003973 paint Substances 0.000 title abstract description 5
- 238000005507 spraying Methods 0.000 title abstract description 5
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 45
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 45
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 35
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000003822 epoxy resin Substances 0.000 claims abstract description 31
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 31
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 229920001225 polyester resin Polymers 0.000 claims abstract description 28
- 239000004645 polyester resin Substances 0.000 claims abstract description 28
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000010445 mica Substances 0.000 claims abstract description 21
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000003960 organic solvent Substances 0.000 claims abstract description 7
- 239000004593 Epoxy Substances 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000002253 acid Substances 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 21
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 12
- 239000008096 xylene Substances 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 6
- 239000012948 isocyanate Substances 0.000 claims description 5
- 150000002513 isocyanates Chemical class 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 238000010422 painting Methods 0.000 claims description 4
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 3
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 3
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 239000002356 single layer Substances 0.000 abstract description 7
- 230000032683 aging Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 19
- 239000002994 raw material Substances 0.000 description 19
- 238000004132 cross linking Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 239000011253 protective coating Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- LZDKZFUFMNSQCJ-UHFFFAOYSA-N 1,2-diethoxyethane Chemical compound CCOCCOCC LZDKZFUFMNSQCJ-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- KVXNKFYSHAUJIA-UHFFFAOYSA-N acetic acid;ethoxyethane Chemical compound CC(O)=O.CCOCC KVXNKFYSHAUJIA-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-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
-
- 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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
- B05D2202/15—Stainless steel
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a high-performance protective paint and a paint spraying process thereof, wherein the protective paint comprises epoxy resin, carboxyl polyester resin, acrylic resin, zinc powder, mica powder and an organic solvent; wherein the sum of the parts by weight of the epoxy resin, the carboxyl polyester resin and the acrylic resin accounts for not less than 40% of the weight of the high-performance protective paint, and the sum of the parts by weight of the zinc powder and the mica powder accounts for not less than 15% of the weight of the high-performance protective paint; when the invention is practically applied, the single-layer curing coating is obtained by only secondary application and single baking and curing process molding, and the excellent ageing-resistant, wear-resistant and corrosion-resistant protection effects are realized through the single-layer curing coating, and the process is simple and reliable.
Description
Technical Field
The invention belongs to the field of steel plate protection, and particularly relates to high-performance protective paint.
Background
In some specific fields of steel structures (such as containers, escalators and the like), the steel has been required to have very excellent protective properties for long-term use in outdoor environments, and particularly has various composite effects including excellent aging resistance, wear resistance, corrosion resistance and the like. The protective coating applied to the existing steel plate basically only realizes a single effect, and in order to realize the requirements of multiple composite effects, multiple protective coatings are required to be arranged, so that the construction process is complex, the problem of coating adhesion can be caused when the multiple protective coatings are arranged on the surface of the steel plate, and the protective effect is lost.
For this reason, the applicant has desired to solve the above-mentioned problems by seeking a technical solution.
Disclosure of Invention
In view of the above, the present invention aims to provide a high performance protective paint and a paint spraying process thereof, wherein in practical application, only a secondary application and a single baking and curing process are needed to form a single-layer structure cured coating, and excellent aging resistance, wear resistance and corrosion resistance protective effects are achieved through the single-layer cured coating, and the process is simple and reliable.
The technical scheme adopted by the invention is as follows:
a high-performance protective paint comprises epoxy resin, carboxyl polyester resin, acrylic resin, zinc powder, mica powder and an organic solvent; wherein the sum of the parts by weight of the epoxy resin, the carboxyl polyester resin and the acrylic resin is not less than 40% by weight of the high-performance protective paint, and the sum of the parts by weight of the zinc powder and the mica powder is not less than 15% by weight of the high-performance protective paint.
Preferably, the epoxy resin has an epoxy equivalent of 450 to 650g/eq and the carboxyl polyester resin has an acid value of 65 to 95mgKOH/g.
Preferably, the acrylic resin comprises 1:1 parts by weight of GMA acrylic resin and carboxyl acrylic resin; wherein the epoxy equivalent of the GMA acrylic resin is 300-500g/eq, and the acid value of the carboxyl acrylic resin is 25-55mgKOH/g.
Preferably, the weight part ratio of the epoxy resin, the carboxyl polyester resin and the acrylic resin is 1:0.5-1.5:0.5-1.5; the weight ratio of the zinc powder to the mica powder is 1:0.2-1.
Preferably, the high-performance protective paint further comprises isocyanate, wherein the weight part ratio of the isocyanate to the sum of the weight parts of the epoxy resin, the carboxyl polyester resin and the acrylic resin is 2-6wt%.
Preferably, the high-performance protective paint further comprises an imidazole curing accelerator, wherein the imidazole curing accelerator accounts for 1-5wt% of the epoxy resin.
Preferably, the high performance protective paint further comprises 0.5 to 2wt% of alumina and 0.2 to 1wt% of defoamer.
Preferably, the organic solvent is selected from one or a mixture of any of toluene, xylene, ethyl acetate, butyl acetate, methyl isobutyl ketone, glycol diethyl ether acetate, glycol butyl ether and cyclohexanone.
Preferably, a method for spraying the high-performance protective paint comprises the following operation steps:
a1 Applying the high-performance protective paint on a steel plate and pre-baking to form a precoating coating with the thickness ranging from 20 micrometers to 40 micrometers;
a2 And then further applying high-performance protective paint to the steel plate provided with the precoating coating, and baking and curing to obtain a cured coating, wherein the thickness of the cured coating is 50-80 microns.
Preferably, in the step A1), the temperature of the pre-baking is 80-100 ℃ for 5-10 minutes; in the step A2), the baking and curing temperature ranges from 180 ℃ to 230 ℃ and the time ranges from 15 minutes to 25 minutes.
The epoxy resin, the carboxyl polyester resin and the acrylic resin with the weight ratio of not less than 40 percent are adopted as the main body part of the protective paint, and are subjected to special crosslinking and curing reaction, so that the protective paint has good adhesive force performance with steel plates, excellent weather resistance and ageing resistance and scratch resistance and wear resistance, and meanwhile, zinc powder and mica powder are cooperatively matched to improve the corrosion resistance of the protective paint on the steel plates; in practical application, the single-layer cured coating is obtained by only secondary application and single baking and curing processes, and the excellent ageing-resistant, wear-resistant and corrosion-resistant protection effects are realized through the single-layer cured coating, so that the process is simple and reliable.
Drawings
FIG. 1 is a block diagram of the operational steps of a paint spray process according to an embodiment of the present application.
Detailed Description
The embodiment of the invention discloses a high-performance protective paint which comprises epoxy resin, carboxyl polyester resin, acrylic resin, zinc powder, mica powder and an organic solvent; wherein the sum of the parts by weight of the epoxy resin, the carboxyl polyester resin and the acrylic resin is not less than 40% by weight of the high-performance protective paint, and the sum of the parts by weight of the zinc powder and the mica powder is not less than 15% by weight of the high-performance protective paint.
In order to facilitate the crosslinking curing compactness and scratch resistance effect of the coating, preferably, in the present embodiment, the epoxy equivalent of the epoxy resin is 450 to 650g/eq, and the acid value of the carboxyl polyester resin is 65 to 95mgKOH/g; the acrylic resin comprises 1:1 parts by weight of GMA acrylic resin and carboxyl acrylic resin; wherein the epoxy equivalent of the GMA acrylic resin is 300-500g/eq, and the acid value of the carboxyl acrylic resin is 25-55mgKOH/g.
Preferably, in the present embodiment, the weight part ratio between the epoxy resin, the carboxyl polyester resin and the acrylic resin is 1:0.5-1.5:0.5 to 1.5, more preferably, the weight part ratio between the epoxy resin, the carboxyl polyester resin and the acrylic resin is 1:0.8 to 1.2:0.8 to 1.2; the weight part ratio between the zinc powder and the mica powder is 1:0.2-1, more preferably, the weight part ratio between the zinc powder and the mica powder is 1:0.5-0.8.
Preferably, in the present embodiment, in order to allow the hydroxyl groups remaining in the resin to undergo a sufficient crosslinking curing reaction, the high-performance protective paint further includes isocyanate in a proportion of 2 to 6wt% based on the sum of the parts by weight of the epoxy resin, the carboxyl polyester resin and the acrylic resin; in order to further promote the crosslinking curing speed and the full reaction between the epoxy groups and the carboxyl groups in the resin system, preferably, the high-performance protective paint further comprises an imidazole curing accelerator, wherein the imidazole curing accelerator accounts for 1-5wt% of the epoxy resin.
Preferably, in order to facilitate the flow properties of the high performance protective paint at the time of the painting construction, in the present embodiment, the high performance protective paint further includes 0.5 to 2wt% of alumina and 0.2 to 1wt% of an antifoaming agent.
Preferably, in the present embodiment, the organic solvent is selected from one or a mixture of any of toluene, xylene, ethyl acetate, butyl acetate, methyl isobutyl ketone, ethylene glycol diethyl ether acetate, ethylene glycol butyl ether, and cyclohexanone.
Preferably, this embodiment also proposes a method for painting a high-performance protective paint as described above, comprising the following operating steps:
a1 Applying high-performance protective paint on the steel plate and pre-baking to form a precoating coating with the thickness ranging from 20 micrometers to 40 micrometers;
a2 And then further applying high-performance protective paint to the steel plate provided with the precoating coating, and baking and curing to obtain a cured coating, wherein the thickness of the cured coating is 50-80 microns.
Preferably, in step A1), the pre-baking temperature is in the range of 80-100deg.C for 5-10 minutes; in step A2), the baking and curing temperature is 180-230 ℃ and the time is 15-25 minutes.
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1: a high-performance protective paint is composed of the following raw materials:
20% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
20% by weight of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
10wt% of GMA acrylic resin with an epoxy equivalent of 300-500g/eq;
10% by weight of a carboxylic acrylic resin (commercially available product) having an acid value of 35 to 55mgKOH/g;
10wt% zinc powder (commercially available product);
5% by weight of mica powder (commercially available product);
25% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
The high performance protective paint of this example 1 was sprayed on steel sheet by spray gun and pre-baked at 90 ℃ for 8 minutes to form a pre-coat layer with a thickness of 30 μm; then, the steel plate provided with the precoating coating is further coated with high-performance protective paint, and the steel plate is baked and cured (the temperature is 220 ℃ and the time is 20 minutes) to obtain a cured coating, wherein the thickness of the cured coating is 65 micrometers.
Example 2: a high-performance protective paint is composed of the following raw materials:
15% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
15wt% of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
7.5wt% GMA acrylic resin having an epoxy equivalent of 300-500g/eq;
7.5wt% of a carboxylic acrylic resin (commercially available product) having an acid value of 35 to 55mgKOH/g;
10wt% zinc powder (commercially available product);
5% by weight of mica powder (commercially available product);
25% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
The high performance protective paint of this example 2 was sprayed on steel sheet by spray gun and pre-baked at 95 ℃ for 6 minutes to form a pre-coat layer with a thickness of 30 microns; then, the steel plate provided with the precoating coating is further coated with high-performance protective paint, and the steel plate is baked and cured (the temperature is 220 ℃ and the time is 20 minutes) to obtain a cured coating, wherein the thickness of the cured coating is 65 micrometers.
Example 3: a high-performance protective paint is composed of the following raw materials:
15% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
20% by weight of a carboxyl polyester resin (commercially available product) having an acid value of 70 to 90mgKOH/g;
7.5wt% GMA acrylic resin having an epoxy equivalent of 300-500g/eq;
15wt% zinc powder (commercially available product);
5.5wt% mica powder (commercially available product);
37wt% toluene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
The high performance protective paint of this example 3 was sprayed on steel sheet by spray gun and pre-baked at 85 ℃ for 10 minutes to form a pre-coat layer with a thickness of 30 microns; then, the steel plate provided with the precoating coating is further coated with high-performance protective paint, and the steel plate is baked and cured (the temperature is 180 ℃ and the time is 25 minutes) to obtain a cured coating, wherein the thickness of the cured coating is 65 micrometers.
Example 4: the rest of the technical solutions in this embodiment 4 are the same as those in embodiment 1, except that the high-performance protective paint in this embodiment 4 is composed of the following raw materials:
15% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
15wt% of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
10wt% of GMA acrylic resin with an epoxy equivalent of 300-500g/eq;
10% by weight of a carboxylic acrylic resin (commercially available product) having an acid value of 35 to 55mgKOH/g;
0.5wt% of an imidazole-based curing accelerator (commercially available product);
2% by weight of isocyanate (commercially available product);
1.5wt% alumina (commercially available product);
1wt% of an antifoaming agent (commercially available product);
10wt% zinc powder (commercially available product);
5% by weight of mica powder (commercially available product);
30% by weight of xylene (commercially available product).
Comparative example 1: the rest technical proposal of the comparative example 1 is the same as the example 1, except that the high-performance protective paint in the comparative example 1 consists of the following raw materials:
30% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
30% by weight of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
10wt% zinc powder (commercially available product);
5% by weight of mica powder (commercially available product);
25% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
Comparative example 2: the rest technical proposal of the comparative example 2 is the same as the example 1, except that the high-performance protective paint in the comparative example 2 consists of the following raw materials:
30% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
30% by weight of a carboxylic acrylic resin (commercially available product) having an acid value of 35 to 55mgKOH/g;
10wt% zinc powder (commercially available product);
5% by weight of mica powder (commercially available product);
25% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
Comparative example 3: the rest technical proposal of the comparative example 3 is the same as the example 1, except that the high-performance protective paint in the comparative example 3 consists of the following raw materials:
20% by weight of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
30wt% of GMA acrylic resin with an epoxy equivalent of 300-500g/eq;
10% by weight of a carboxylic acrylic resin (commercially available product) having an acid value of 35 to 55mgKOH/g;
10wt% zinc powder (commercially available product);
5% by weight of mica powder (commercially available product);
25% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
Comparative example 4: the rest technical proposal of the comparative example 4 is the same as the example 1, except that the high-performance protective paint in the comparative example 4 consists of the following raw materials:
20% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
20% by weight of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
10wt% of GMA acrylic resin with an epoxy equivalent of 300-500g/eq;
10% by weight of a carboxylic acrylic resin (commercially available product) having an acid value of 35 to 55mgKOH/g;
40% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
Comparative example 5: the rest technical scheme of the comparative example 5 is the same as that of the example 1, except that the high-performance protective paint in the comparative example 5 consists of the following raw materials:
25% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
25% by weight of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
25wt% zinc powder (commercially available product);
5% by weight of mica powder (commercially available product);
20% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
Comparative example 6: the rest technical scheme of the comparative example 6 is the same as that of the example 1, except that the high-performance protective paint in the comparative example 6 consists of the following raw materials:
20% by weight of an epoxy resin (commercially available product) having an epoxy equivalent weight of 450-650g/eq;
20% by weight of a carboxyl polyester resin (commercially available product) having an acid value of 65 to 75mgKOH/g;
10wt% of GMA acrylic resin with an epoxy equivalent of 300-500g/eq;
10% by weight of a carboxylic acrylic resin (commercially available product) having an acid value of 35 to 55mgKOH/g;
15wt% zinc powder (commercially available product);
25% by weight of xylene (commercially available product).
The raw materials are fully stirred, dispersed and mixed to obtain the high-performance protective paint.
To verify the effect of the present example and comparative example, the present application conducted the relevant performance tests on the cured coatings, respectively, and in particular conducted the performance comparisons shown in the following table 1:
TABLE 1
As can be seen from the table 1, the single-layer cured coating provided by the application realizes excellent aging-resistant, wear-resistant and corrosion-resistant protection effects at the same time, and the process is simple and reliable.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The high-performance protective paint is characterized by comprising epoxy resin, carboxyl polyester resin, acrylic resin, zinc powder, mica powder and an organic solvent; wherein the sum of the parts by weight of the epoxy resin, the carboxyl polyester resin and the acrylic resin accounts for not less than 40% of the weight of the high-performance protective paint, and the sum of the parts by weight of the zinc powder and the mica powder accounts for not less than 15% of the weight of the high-performance protective paint; the epoxy equivalent of the epoxy resin is 450-650g/eq, and the acid value of the carboxyl polyester resin is 65-95mgKOH/g; the acrylic resin comprises 1:1 parts by weight of GMA acrylic resin and carboxyl acrylic resin; wherein the epoxy equivalent of the GMA acrylic resin is 300-500g/eq, and the acid value of the carboxyl acrylic resin is 25-55mgKOH/g; the weight part ratio of the epoxy resin to the carboxyl polyester resin to the acrylic resin is 1:0.5-1.5:0.5-1.5; the weight ratio of the zinc powder to the mica powder is 1:0.2-1.
2. The high performance protective paint according to claim 1, further comprising isocyanate in a proportion of 2 to 6wt% based on the sum of the parts by weight of the epoxy resin, the carboxyl polyester resin and the acrylic resin.
3. The high performance protective paint according to claim 1, further comprising an imidazole-based curing accelerator, wherein the imidazole-based curing accelerator accounts for 1-5wt% of the epoxy resin.
4. The high performance protective paint according to claim 1, further comprising 0.5-2wt% of alumina and 0.2-1wt% of defoamer.
5. The high-performance protective paint according to claim 1, wherein the organic solvent is selected from one or a mixture of any of toluene, xylene, ethyl acetate, butyl acetate, methyl isobutyl ketone, glycol ethyl ether acetate, glycol butyl ether and cyclohexanone.
6. A method of painting a high performance protective paint according to any one of claims 1 to 5, comprising the following operative steps:
a1 Applying the high-performance protective paint on a steel plate and pre-baking to form a precoating coating with the thickness ranging from 20 micrometers to 40 micrometers;
a2 And then further applying high-performance protective paint to the steel plate provided with the precoating coating, and baking and curing to obtain a cured coating, wherein the thickness of the cured coating is 50-80 microns.
7. The method of painting according to claim 6, wherein in said step A1), said pre-baking is carried out at a temperature ranging from 80 to 100 ℃ for a period ranging from 5 to 10 minutes; in the step A2), the baking and curing temperature ranges from 180 ℃ to 230 ℃ and the time ranges from 15 minutes to 25 minutes.
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