CN110804383B - Primer composition for high-film-thickness coating, primer and application thereof - Google Patents
Primer composition for high-film-thickness coating, primer and application thereof Download PDFInfo
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- CN110804383B CN110804383B CN201911141207.XA CN201911141207A CN110804383B CN 110804383 B CN110804383 B CN 110804383B CN 201911141207 A CN201911141207 A CN 201911141207A CN 110804383 B CN110804383 B CN 110804383B
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4045—Mixtures of compounds of group C08G18/58 with other macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/58—Epoxy resins
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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 invention discloses a primer composition for high-film-thickness coating, which comprises polyester resin, epoxy resin, a curing agent and a solvent. The primer composition can reach 25 mu m by one-time coating, has excellent recoatability and baking resistance, has a large construction interval, and simultaneously has high corrosion resistance, aging resistance, friction resistance and covering performance of a paint film, and can be used as a primer for coating the exterior of a coiled material. The invention also discloses application of the primer composition.
Description
Technical Field
The invention relates to the technical field of coatings. More particularly, it relates to a primer composition for high film thickness coating, a primer and its application.
Background
With the rapid development of the color coated sheet industry, the development of the color coated sheet coating with excellent performance to meet the requirements of high-grade and diversified products becomes a hot point of domestic and foreign research. At present, common building material coatings can meet the performance requirements of most building coatings in the market, but in recent years, along with the continuous expansion of the application of color steel plates, more and more customers favor the use of the integrated and light color-coated plates. The paint performance does not reach the standard due to special use conditions of some products, such as clean rooms and workshops of sanitary grade, animal husbandry buildings with high corrosivity, chemical buildings with stronger corrosive atmosphere, coastal high-corrosion-resistant building roofs, wall surfaces and the like. In particular, large public building curtain walls have mandatory requirements on durability and corrosion resistance. When the building products are used, the aging and peeling of the coating can be accelerated due to special high-corrosion environment or severe weather, and the service life and the appearance of the products are seriously influenced. The high film thickness of the primer coating improves this, however, for building materials requiring high film thickness, in particular, multiple applications are required, and for color steel sheets with excessively high total film thickness, primer recoatability and baking resistance are particularly important and prominent. At present, the coil is used as the primer with high film thickness, because the primer is limited by a coating process and a technical bottleneck, a large technical challenge still exists, and mature products are not much.
Disclosure of Invention
Based on the above facts, a first object of the present invention is to provide a primer composition for high-film-thickness coating, which can be used in coating of a high-film-thickness primer for coil coating, is excellent in recoatability and baking resistance, has a large construction window, and also has high corrosion resistance, aging resistance, abrasion resistance and hiding performance of a paint film.
The second object of the present invention is to provide a primer for high film thickness coating.
The third purpose of the invention is to provide application of the primer for high-film-thickness coating.
In order to achieve the first purpose, the invention adopts the following technical scheme:
a primer composition for high-film-thickness coating comprises polyester resin, epoxy resin, a curing agent and a solvent.
Further, the content of the polyester resin in the primer composition is 30-60 wt% in terms of weight percentage.
Further, the content of the polyester resin in the primer composition is 20-45 wt% in terms of weight percentage.
Further, the polyester resin is a saturated polyester resin.
Further, the acid value of the polyester resin is 10mg KOH/g or less, preferably 8mg KOH/g or less, and more preferably 6mg KOH/g or less.
Further, the hydroxyl value of the polyester resin is 20-65mg KOH/g, preferably 30-60mg KOH/g.
Further, the molecular weight of the polyester resin is 4000-.
Further, the solid content of the polyester resin is 60% by weight or more.
Further, the content of the epoxy resin in the primer composition is 0.1-20 wt% in terms of weight percentage.
Further, the content of the epoxy resin in the primer composition is 1-10 wt% in terms of weight percentage.
Further, the epoxy resin has an epoxy equivalent of 150-.
Further, the solid content of the epoxy resin is 70% by weight or more.
Further, the epoxy resin is selected from one or more of domestic Baobao epoxy resin with the model number of 609-40, HEXION epoxy resin with the model number of EPIKOTE 828EL, and south Asia epoxy resin with the model number of NPSN-901 multiplied by 75.
Further, the mass ratio of the polyester resin to the epoxy resin to the curing agent is 4-6: 0.1-1: 0.2 to 1.
Further, the content of the curing agent in the primer composition is 0.1-20 wt% in percentage by weight.
Further, the content of the curing agent in the primer composition is 1-10 wt% in percentage by weight.
Further, the curing agent is an isocyanate resin, preferably a blocked isocyanate resin.
Further, the content of the solvent in the primer composition is 10 to 30 wt%, preferably 15 to 20 wt%, in terms of weight percentage.
Further, the solvent is at least one selected from cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, S-100 solvent oil, trimethylbenzene solvent oil and 2-butanone.
In order to achieve the second object, the present invention provides a primer for high-film thickness coating, which is obtained from the primer composition for high-film thickness coating described in the first object.
In order to achieve the third object, the present invention provides the use of the primer for high film thickness coating described above in the second object for coil exterior coating.
Further, the application comprises the steps of:
and coating the primer for high-film-thickness coating on the substrate for one time or multiple times in sequence, and baking and curing to form a primer layer on the substrate.
The invention has the following beneficial effects:
the primer composition for high-film-thickness coating provided by the invention can be used for normal baking, is also suitable for high-linear-speed baking, and is particularly suitable for a product production line with weak baking conditions and short period. Meanwhile, the primer composition has strong adhesion with various substrates, can be coated for multiple times, resists multiple baking, has relatively wide construction temperature, good durability and corrosion resistance, can obtain high film thickness, can obtain a one-time coating film with the thickness of more than 25 microns, has excellent recoatability and baking resistance, and has obvious advantages compared with the existing polyester-polyurethane type high-film-thickness primer.
Detailed Description
In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
One embodiment of the present invention provides a primer composition for high film thickness coating, including a polyester resin, an epoxy resin, a curing agent, and a solvent.
The polyester resin in the present embodiment may be a saturated polyester resin, that is, a polyester resin containing a terminal hydroxyl functional group, and may be cured to form a film by crosslinking with a resin such as isocyanate or an amino resin. The acid value, hydroxyl value, molecular weight, etc. of the polyester resin directly affect the properties of the polyester resin including film coating, flexibility, baking resistance, weather resistance, adhesion strength to a substrate, etc. Among them, the acid value suitable for the polyester resin used in the present embodiment is preferably 10mg KOH/g or less, more preferably 8mg KOH/g or less, and still more preferably 6mg KOH/g or less; the hydroxyl value of the polyester resin is 20-65mg KOH/g, preferably 30-60mg KOH/g; the molecular weight of the polyester resin is 4000-16000, preferably 4500-6000.
In a preferred example, the solid content of the polyester resin is 60 to 100% by weight, preferably 65 to 75% by weight.
In still other preferred examples, the polyester resin includes, but is not limited to, polyester resin model ES420 available from SK of Korea, polyester resin model LH831-24 available from Evonik, polyester resin model 2017XZ-809 available from Arkema, polyester resin model LH-826-29 available from Changxing, polyester resin model NP012 RJZ available from Nippon, and the like.
Further, in some preferred examples, the content of the polyester resin in the primer composition is 30 to 60 wt%, preferably 20 to 45 wt%, in terms of weight percentage.
The epoxy resin suitable for use in the present embodiment may be a solvent-free type or a high-solid type liquid resin, and the solid content is preferably 70 to 100% by weight. Further preferably, the epoxy resin has an epoxy equivalent of 150-. Exemplary epoxy resins include, but are not limited to, 609-40 epoxy resins from domestic Baobao, EPIKOTE 828EL epoxy resins from HEXION, NPSN-901 × 75 epoxy resins from south Asia.
In some preferred examples, the epoxy resin is present in the primer composition in an amount of 0.1 to 20 wt%, preferably 1 to 10 wt%, based on the weight percentage.
In still other examples, the curing agent is an isocyanate resin, preferably a blocked isocyanate resin, and the unblocked isocyanate and alcohol are condensed to form a polyurethane resin. Exemplary isocyanate resins include, but are not limited to, polyisocyanates such as 2, 4-toluene diisocyanate, hexamethylene diisocyanate, polymethylene-polyphenyl diisocyanates, methylene diphenyl diisocyanate, cyclic trimers, co-rings; trimers, or mixtures, preferably trimers, such as bayer BL3175, Evonik B1358, and the like, as well as other similar blocked isocyanate resins commercially available. The content of the curing agent in the primer composition is 0.1 to 20 wt%, preferably 1 to 10 wt%, in terms of weight percentage.
In this embodiment, the combination of the polyester resin, epoxy resin and curing agent in the specific amounts described above imparts the primer composition with good properties, such as good adhesion to the substrate and the topcoat, and the ability to be applied multiple times, resist multiple baking, have a relatively wide application temperature, good durability and corrosion resistance, and high film thickness.
Furthermore, the mass ratio of the polyester resin to the epoxy resin to the curing agent is 4-6: 0.1-1: 0.2-1, and the performance of multiple coating resistance and baking resistance is better.
In a preferred example, the solvent is at least one of cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, S-100 solvent oil, trimethylbenzene solvent oil and 2-butanone. The solvent is preferably present in an amount of 10 to 30 wt%, more preferably 15 to 20 wt%, based on the total weight of the coating composition.
The primer composition of the present invention may also comprise other optional ingredients that do not adversely affect the primer composition or the cured primer composition resulting therefrom. Such optional ingredients are typically included in the primer composition to enhance the coating aesthetics to facilitate manufacture, processing, handling, and application of the composition, and to further improve the specific functionality of the primer composition or the cured primer composition resulting therefrom. For example, the compositions of the present invention may optionally include fillers, catalysts, pigments, rust inhibiting pigments, matting agents, extenders, leveling agents, defoamers, dispersants, adhesion promoters, and mixtures thereof as needed to provide desired film properties. Each optional ingredient is preferably included in a sufficient amount to suit its intended purpose, but in an amount that does not adversely affect the coating composition or the cured coating composition resulting therefrom.
Useful optional ingredients include pigments, which have hiding power, tinting strength, are relatively stable to light, and are commonly used in formulating coatings, inks, and pigmented plastics and rubbers, while serving as both a tinting and filling function. Such as titanium dioxide, yellow iron oxide, and the like. Pigments suitable for use with the compositions described herein are known to those skilled in the art and may vary depending on the desired color or appearance of the coating. If a pigment is used, preferably the pigment is present in the primer composition in an amount of no more than 30 wt.%, more preferably no more than 20 wt.%, and even more preferably no more than 10 wt.%, based on the total weight of the primer composition.
Useful optional ingredients include extender pigments, which are low refractive index white and colorless pigments, primarily to increase coating volume, to provide a filler effect, and to reduce coating cost. In a paint film, the system pigment is used for improving the leveling property, impermeability, glossiness and the like of the paint, can also improve the mechanical property of the paint film, has the functions of enabling the paint film to be durable, hard and wear-resistant and the like, and can also effectively improve the covering power of the titanium dioxide. For example, at least one of calcium carbonate, magnesium silicate, aluminum silicate, calcium sulfate, crystalline silica, diatomaceous earth, barium sulfate, and the like. In the primer composition of the present invention, extender pigments suitable for use with the compositions described herein are known to those skilled in the art by adding different pigments and may vary depending on the desired color or appearance of the coating. If extender pigments are used, preferably, the pigments are present in the coating composition in an amount of no more than 30 wt.%, more preferably no more than 20 wt.%, and even more preferably no more than 15 wt.%, based on the total weight of the coating composition.
Useful optional ingredients include rust inhibiting pigments, for example, at least one of aluminum zinc tripolyphosphate, zinc yellow, zinc phosphate, strontium chrome yellow, calcium zinc phosphomolybdate, or ceramic-based rust inhibiting pigments, and the like. Anti-rust pigments suitable for use with the compositions described herein are known to those skilled in the art and may vary depending on the desired anti-corrosion effect. If a rust inhibitive pigment is used, preferably, the pigment is present in the coating composition in an amount of no more than 35 wt-%, more preferably no more than 25 wt-%, and even more preferably no more than 15 wt-%, based on the total weight of the coating composition.
Dispersants, leveling agents and defoamers may optionally be added to the composition to aid in the flow and wetting of the coating, and the appearance of the coating. Such adjuvants suitable for use with the compositions described herein are known to those skilled in the art and may vary depending on the desired appearance of the coating. The dispersant is preferably at least one of BYK 110, BYK115, BYKP-104 and SOLSPERSE 2000. The leveling agent is a non-silicon system leveling agent, and preferably at least one of BYK-392, BYK-054, BYK-355 and BYK-358N, AFCONA-3773 in Bike chemistry. The defoaming agent is a non-silicon system defoaming agent, and preferably at least one of BYK-352, BYK-354 and AFCONA 2720. Such adjuvants, if used, are preferably present in an amount of at least 0.01 wt%, and more preferably at least 0.1 wt%, based on the weight of resin solids. If such an aid is used, it is preferably present in an amount of no more than 10 wt%, and more preferably no more than 5 wt%, based on the weight of resin solids.
Useful optional ingredients also include acid catalysts, primarily blocked acid catalysts, preferably at least one of dinonylnaphthalene disulfonic acid (DNNDSA), dinonylnaphthalene sulfonic acid (DNNSA), dodecylbenzene sulfonic acid (DDBSA), P-toluenesulfonic acid (P-TSA). Preferably, it is from 0.1 to 2 wt%, more preferably from 0.5 to 1.5 wt%, based on the total weight of the coating composition.
Useful optional ingredients also include adhesion promoters which are epoxy, silicone, phosphate modified polymers, preferably phosphate modified polymers, such as at least one of PAE 206, DS-600, Lubrizol 2063, AKN-6105, Tech-7205, ADP, SN7063, TZ 8805. Preferably, it is from 0.1 to 2 wt%, more preferably from 0.5 to 1.5 wt%, based on the total weight of the coating composition.
Still another embodiment of the present invention provides a primer for high film thickness coating prepared from the primer composition for high film thickness coating described above.
Yet another embodiment of the present invention provides a coating system comprising one or more of the primers, and a plurality of topcoats.
Still another embodiment of the present invention provides the use of the primer for high film thickness coating as described above for coil exterior coating.
Further, the application comprises the steps of:
Coating the primer for high-film-thickness coating on a substrate for one time or multiple times in sequence to form a primer layer on the substrate; wherein, after each coating, baking and curing are carried out.
Specifically, 1) one or more layers of primer compositions are coated on a substrate in sequence, required by one or more layers of primer compositions, and baked and cured; it should be noted that, the primer composition is applied for a plurality of times through a wet-on-dry process, i.e., after the multi-layer primer is cured by baking, the primer composition can be applied continuously;
2) sequentially coating one or more layers of finish paint compositions on the cured base paint, forming the required finish paint composition through one or more layers of coating finish paint compositions, and baking and curing; it should be noted that, the finish composition is applied for many times in a wet-on-dry process, that is, after a plurality of layers of finish paint are baked and cured, the finish paint composition can be continuously applied;
the present invention also provides a coated substrate wherein the above-described coating composition is applied as a primer layer to at least a portion of the substrate, preferably a metal substrate. The coated substrate preferably further comprises at least one pretreatment layer adhered to the primer layer. Suitable substrates include, but are not limited to, substrates formed from cold rolled steel, polished steel, black skin steel, iron phosphate treated steel, zinc phosphate treated steel, hot galvanized steel, zinc aluminum magnesium alloy, electrogalvanized steel sheet, tin-plated steel sheet, stainless steel, aluminum alloy, brass, and the like.
In some embodiments, the specific process of coating may apply the above-described primer composition as a primer to the substrate to be treated by conventional coating techniques such as roll coating, spray coating, dip coating, and the like. The thickness of the coating film formed by applying the primer composition will vary depending on the intended application, but is usually in the range of 15 to 30 μm, preferably 20 to 25 μm, in terms of dry film thickness. The baking process of the primer is generally baking in an oven at 300 ℃ for 40-60s, and the baking temperature of a metal plate PMT: 210 ℃ and 249 ℃, preferably PMT 216 ℃ and 241 ℃.
The at least one topcoat layer applied over the primer layer may be a conventional topcoat layer coating known in the art, examples including, but not limited to, alkyd polyester topcoat layers, saturated polyester topcoat layers, polyurethane topcoat layers, acrylate topcoat layers, PVC topcoat layers, PVDF topcoat layers, and the like. The thickness of the coating film formed by applying the top coat will vary depending on the intended application and type, and the dry film thickness of the primary coating of the top coat layer is usually in the range of 12 to 30 μm, preferably 15 to 25 μm. The baking process of the top coating is generally baking in an oven at 300 ℃ for 40-60s, and the temperature of a metal plate PMT: and 224 ℃ and 249 ℃, and PMT 232 ℃ and 241 ℃ are selected.
The technical solution of the present invention is described below with reference to some specific examples:
Test method
Unless stated otherwise, the following examples are tested according to the national standard GB/T13448-2006, and the results thereof meet the requirements of the national standard GB/T13448-2006.
Example 1
The primer composition for high film thickness coating of the present invention was prepared according to the following formulation of table 1:
table 1 example 1 primer composition
Adding saturated polyester resin, S150 solvent and BYK110 into a container in sequence, mixing and uniformly stirring, then adding titanium dioxide, strontium chrome yellow and barium sulfate into the container in sequence under stirring, stirring for 3 minutes, then grinding the mixture by using a grinder until the fineness of the mixture is not more than 10 microns, then adding isocyanate, epoxy resin, matting powder, adhesion promoter and acid catalyst into the mixture under stirring, uniformly stirring, adjusting the color, the gloss and the viscosity as required, adjusting the viscosity of the mixture to be 100-140 seconds, measuring the mixture by using a coating-4 cup, filtering and packaging to obtain the high-film-thickness primer coating composition.
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: a primer having a film thickness of 25 μm was obtained at 224 ℃.
Finishing paint coating and plate making: taking commercially available Nippon self-produced PVDF finish, and marking: DURA UNIFLON, the resulting topcoat was bar-rolled over the basecoat of this example, baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ to obtain a finish with a film thickness of 25 μm.
Example 2
A high film thickness primer composition was obtained according to the formulation and process of example 1.
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: a primer having a film thickness of 25 μm was obtained at 224 ℃. And coating a layer of the primer composition on the surface of the cured primer, and obtaining the primer with the film thickness of 50 mu m under the same baking condition.
Finishing paint coating and plate making: taking commercially available Nippon self-produced PVDF finish, and marking: the DURA UNIFLON white topcoat was wire bar-rolled over the basecoat of this example and baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ and a finish paint with the thickness of 25 mu m. And coating a layer of PVDF finish on the surface of the cured primer, wherein the baking conditions are the same, and the finish with the film thickness of 50 mu m is obtained.
Example 3
A high film thickness primer composition was obtained according to the formulation and process of example 1
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: a primer having a film thickness of 25 μm was obtained at 224 ℃. And coating two layers of the primer composition on the surface of the cured primer, and baking under the same condition to obtain the primer with the film thickness of 75 microns.
In each example, the primer composition is applied multiple times in a wet-on-dry process, i.e., after the multi-layer primer is cured by baking, the primer composition is applied continuously.
Finishing paint coating and plate making: taking commercially available Nippon self-produced PVDF finish, and marking: the DURA UNIFLON white topcoat was wire bar-rolled over the basecoat of this example and baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ to obtain a finish with a film thickness of 25 μm.
Example 4
A high film thickness primer coating composition was obtained according to the formulation and process of example 1
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: 241 ℃ to obtain a primer with a film thickness of 25 μm.
Finishing paint coating and plate making: taking commercially available Nippon self-produced PVDF finish, and marking: the DURA UNIFLON white topcoat was wire bar-rolled over the basecoat of this example and baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ to obtain a finish with a film thickness of 25 μm.
Example 5
A high film thickness primer coating composition was obtained according to the formulation and process of example 1.
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: 241 ℃ to obtain a primer with a film thickness of 25 μm. And coating a layer of the primer composition on the surface of the cured primer, and baking under the same condition to obtain the primer with the film thickness of 50 mu m.
Finishing paint coating and plate making: taking commercially available Nippon self-produced PVDF finish, and marking: the DURA UNIFLON white topcoat was wire bar-rolled over the basecoat of this example and baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ to obtain a finish with a film thickness of 25 μm. And coating a layer of PVDF finish on the surface of the cured primer, wherein the baking conditions are the same, and the finish with the film thickness of 50 mu m is obtained.
Example 6
A high film thickness primer coating composition was obtained according to the formulation and process of example 1.
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: 241 ℃ to obtain a primer with a film thickness of 25 μm. And coating two layers of the primer composition on the surface of the cured primer, and baking under the same condition to obtain the primer with the film thickness of 75 microns.
Finishing paint coating and plate making: taking commercially available Nippon self-produced PVDF finish, and marking: the DURA UNIFLON white topcoat was wire bar-rolled over the basecoat of this example and baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ to obtain a finish with a film thickness of 25 μm.
Example 7
A high film thickness primer coating composition was obtained according to the formulation and process of example 1.
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: a primer having a film thickness of 25 μm was obtained at 232 ℃.
Finishing paint coating and plate making: taking commercially available Nippon self-produced PVDF finish, and marking: the DURA UNIFLON white topcoat was wire bar-rolled over the basecoat of this example and baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ to obtain a finish with a film thickness of 25 μm.
Example 8
The primer composition for high film thickness coating of the present invention was prepared according to the formulation of the following table 2.
Table 2 example 8 primer composition
The primer composition was used in the preparation of a primer in the manner of example 2 to obtain a primer having a film thickness of 50 μm. At the same time, a finish with a film thickness of 50 μm was obtained.
Example 9
The primer composition for high film thickness coating of the present invention was prepared according to the formulation of the following table 3.
Table 3 example 9 primer composition
| Components | Name (R) | Amount (wt%) |
| Polyester resin | NP 012 RJZ | 44.16％ |
| Dispersing agent | BYK 110 | 0.49％ |
| Solvent(s) | S150 | 14.72％ |
| Rust-proof pigment | Strontium chrome yellow | 7.85％ |
| Pigment (I) | Titanium white R996 | 4.91％ |
| Extender pigment | Precipitated barium sulfate | 10.79％ |
| Matting powder | CAB-O-SIL M-5 | 2.94％ |
| Isocyanates | DESMODUR BL3175A | 4.91％ |
| Catalyst and process for preparing same | CAT4100 | 1.28％ |
| Epoxy resin | EPIKOTE 828EL | 5.89％ |
| Adhesion promoter | SN7063 | 1.18％ |
| Defoaming agent | BYK 352 | 0.39％ |
| Leveling agent | BYK 392 | 0.49％ |
This primer composition was used in the preparation of a primer in the manner of example 3 to obtain a primer having a film thickness of 75 μm. At the same time, a finish coat with a film thickness of 25 μm was obtained.
Example 10
The primer composition for high film thickness coating of the present invention was prepared according to the formulation of table 4 below.
Table 4 example 10 primer composition
| Components | Name (R) | Amount (wt%) |
| Polyester resin | NP 012 RJZ | 33.56％ |
| Dispersing agent | BYK 110 | 0.56％ |
| Solvent(s) | S150 | 12.86％ |
| Rust-proof pigment | Strontium chrome yellow | 8.95％ |
| Pigment (I) | Titanium white R996 | 5.59％ |
| Extender pigment | Precipitated barium sulfate | 12.30％ |
| Matting powder | CAB-O-SIL M-5 | 3.36％ |
| Isocyanates | DESMODUR BL3175A | 7.83％ |
| Catalyst and process for preparing same | CAT4100 | 1.45％ |
| Epoxy resin | EPIKOTE 828EL | 11.19％ |
| Adhesion promoter | SN7063 | 1.34％ |
| Defoaming agent | BYK 352 | 0.45％ |
| Leveling agent | BYK 392 | 0.56％ |
This primer composition was used in the preparation of a primer in the manner of example 3 to obtain a primer having a film thickness of 75 μm. At the same time, a finish with a film thickness of 25 μm was obtained.
Comparative example 1
The primer composition for high film thickness coating of the present invention was prepared according to the formulation of the following table 5.
Table 5 comparative example 1 primer composition
| Components | Name (R) | Amount (wt%) |
| Polyester resin | NP 012 RJZ | 46％ |
| Dispersing agent | BYK 110 | 0.5％ |
| Solvent(s) | S150 | 15％ |
| Rust-proof pigment | Strontium chrome yellow | 8％ |
| Pigment (I) | Titanium white R996 | 5％ |
| Extender pigment | Precipitated barium sulfate | 11％ |
| Matting powder | CAB-O-SIL M-5 | 3％ |
| Isocyanates | DESMODUR BL3175A | 8.1％ |
| Catalyst and process for preparing same | CAT4100 | 1.3％ |
| Adhesion promoter | SN7063 | 1.2％ |
| Defoaming agent | BYK 352 | 0.4％ |
| Leveling agent | BYK 392 | 0.5％ |
Coating primer to prepare a plate: the primer composition obtained was wire bar-rolled on a 0.5mm pretreated galvanized steel sheet, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: a primer having a film thickness of 20 μm was obtained at 224 ℃.
Finishing paint coating and plate making: obtaining permanently-manufactured PVDF finish paint which can be purchased in the market, wherein the mark is as follows: YCP TOPCOAT PVDF SY502C802 white TOPCOAT, which was wire bar rolled over the basecoat of this example, baked in a 300 ℃ oven for 40s, sheet metal temperature PMT: 241 ℃ to obtain a finish with a film thickness of 25 μm.
Comparative example 2
The primer composition for high film thickness coating of the present invention was prepared according to the formulation of table 6 below. Example 1 was repeated to prepare a primer having a film thickness of 25 μm and a topcoat having a film thickness of 25 μm.
Table 6 comparative example 2 primer composition
| Components | Name (R) | Amount (wt%) |
| Polyester resin | NP 012 RJZ | 28.00％ |
| Dispersing agent | BYK 110 | 0.46％ |
| Solvent(s) | S150 | 20.95％ |
| Rust-proof pigment | Strontium chrome yellow | 7.44％ |
| Pigment(s) | Titanium white R996 | 4.65％ |
| Extender pigment | Precipitated barium sulfate | 10.23％ |
| Matting powder | CAB-O-SIL M-5 | 2.79％ |
| Isocyanates | DESMODUR BL3175A | 4.65％ |
| Catalyst and process for preparing same | CAT4100 | 1.21％ |
| Epoxy resin | EPIKOTE 828EL | 17.67％ |
| Adhesion promoter | SN7063 | 1.12％ |
| Defoaming agent | BYK 352 | 0.37％ |
| Leveling agent | BYK 392 | 0.46％ |
Comparative example 3
The primer composition for high film thickness coating of the present invention was prepared according to the formulation of the following table 7. Comparative example 1 was repeated to prepare a primer having a film thickness of 20 μm and a topcoat having a film thickness of 25 μm. That is, the primer having a film thickness of 25 μm or more cannot be obtained by the formulation.
TABLE 7 composition of primer composition for comparative example 3
| Components | Name (R) | Amount (wt%) |
| Polyester resin | NP 012 RJZ | 55.00％ |
| Dispersing agent | BYK 110 | 0.50％ |
| Solvent(s) | S150 | 0.00％ |
| Rust-proof pigment | Strontium chrome yellow | 8.00％ |
| Pigment (I) | Titanium white R996 | 5.00％ |
| Extender pigment | Precipitated barium sulfate | 11.00％ |
| Matting powder | CAB-O-SIL M-5 | 3.00％ |
| Isocyanates | DESMODUR BL3175A | 8.10％ |
| Catalyst and process for preparing same | CAT4100 | 1.30％ |
| Epoxy resin | EPIKOTE 828EL | 6.00％ |
| Adhesion promoter | SN7063 | 1.20％ |
| Defoaming agent | BYK 352 | 0.40％ |
| Leveling agent | BYK 392 | 0.50％ |
The results of the performance test of the final coating obtained in each of the above examples and comparative examples are shown in tables 8 and 9 below.
TABLE 8 test results of the properties of the coatings prepared in examples 1 to 7 above
TABLE 9 test results of the properties of the coatings prepared in each of examples 8 to 10 and comparative examples 1 to 3
The test results show that the coating formed by the coating system can be firmly combined with a metal substrate, has higher processing performance, has excellent wiping resistance and better durability and corrosion resistance, and the provided primer composition has the advantages that the one-time coating can reach 25 mu m, can be coated for multiple times, resists baking for multiple times, has wide construction temperature range, and can completely meet the actual requirements of production.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (5)
1. The primer for coating with high film thickness is characterized by being prepared from a primer composition for coating with high film thickness, wherein the primer composition for coating with high film thickness comprises 30-60wt% of polyester resin, 0.1-20wt% of epoxy resin, 1-10wt% of curing agent and 10-30wt% of solvent in percentage by weight;
the polyester resin is Nippon polyester resin with the model number NP012 RJZ;
the epoxy resin is HEXION epoxy resin with the model number of EPIKOTE 828 EL;
the mass ratio of the polyester resin to the epoxy resin to the curing agent is (4-6): 0.1-1: 0.2 to 1;
the solvent is at least one of cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, S-100 solvent oil and 2-butanone;
The curing agent is DESMODUR BL 3175A.
2. The primer for high film thickness coating according to claim 1, wherein the content of the epoxy resin in the primer composition is 1 to 10% by weight.
3. The primer for high film thickness coating according to claim 1, wherein the content of the solvent in the primer composition is 15 to 20 wt%.
4. Use of the primer for high film thickness coating according to claim 1 for coil exterior coating.
5. The use according to claim 4, characterized in that it comprises the following application steps:
coating the primer for high-film-thickness coating on a substrate for one time or multiple times in sequence to form a primer layer on the substrate; wherein, after each coating, baking and curing are carried out.
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| CN115286978A (en) * | 2022-03-31 | 2022-11-04 | 中海油常州涂料化工研究院有限公司 | General primer capable of being bonded with high polymer film for coiled material and preparation method thereof |
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| JP2001311038A (en) * | 2000-04-27 | 2001-11-09 | Nippon Yushi Basf Coatings Kk | Primer coating composition |
| CN105602435A (en) * | 2016-01-29 | 2016-05-25 | 立邦涂料（天津）有限公司 | Thick plate polyurethane primer and preparation method thereof |
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| JP4526859B2 (en) * | 2004-04-13 | 2010-08-18 | 中国塗料株式会社 | COMPOSITE, SUBSTRATE COATED WITH COATING COMPRISING THE COMPOSITE, AND METHOD FOR PRODUCING SUBSTRATE WITH COATING |
| JP2012012497A (en) * | 2010-06-30 | 2012-01-19 | Basf Coatings Japan Ltd | Undercoat paint composition excellent in corrosion resistance |
| CN110804375A (en) * | 2019-11-15 | 2020-02-18 | 广州立邦涂料有限公司 | Back paint composition for high-coating-weight coil, back paint for coil and application of back paint |
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| JP2001311038A (en) * | 2000-04-27 | 2001-11-09 | Nippon Yushi Basf Coatings Kk | Primer coating composition |
| CN105602435A (en) * | 2016-01-29 | 2016-05-25 | 立邦涂料（天津）有限公司 | Thick plate polyurethane primer and preparation method thereof |
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