CN111454643A - Water-based transparent epoxy primer and preparation method and application thereof - Google Patents
Water-based transparent epoxy primer and preparation method and application thereof Download PDFInfo
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- CN111454643A CN111454643A CN202010489521.3A CN202010489521A CN111454643A CN 111454643 A CN111454643 A CN 111454643A CN 202010489521 A CN202010489521 A CN 202010489521A CN 111454643 A CN111454643 A CN 111454643A
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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
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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
- C09D5/002—Priming paints
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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Abstract
The invention provides a water-based transparent epoxy primer and a preparation method and application thereof. The water-based transparent epoxy primer comprises a component A, a component B and a component C; the component A comprises a water-based epoxy resin; the component B comprises a curing agent, a composite defoaming agent, a wetting agent, a composite flatting agent, an anti-scraping auxiliary agent, a composite thickening agent and a composite solvent; the C component comprises water. The paint film cured by the waterborne transparent epoxy primer has the advantages of high hardness, high film thickness, high gloss and quick drying, and the waterborne transparent epoxy primer can be constructed under wider humidity.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a water-based transparent epoxy primer as well as a preparation method and application thereof.
Background
At present, the coating used on carbon fiber bicycles is mainly oily in the market. In order to stabilize the size of the carbon fiber workpiece, a two-component system cured at low and medium temperature (60-100 ℃) is generally adopted. In the aspect of a coating contacted with a carbon fiber molding rough blank pipe fitting, the epoxy primer has better adhesive force to a substrate, so the water-based epoxy is also applied to a primer layer coating. But the oily epoxy primer can provide a higher disposable film thickness, and the baking curing time is shorter, so the oily epoxy primer has the advantage that the oily epoxy primer is difficult to replace. In addition, because the cured epoxy resin molecules form a three-dimensional network structure, when micro cracks are generated under the action of external load, the micro cracks are easy to expand, so that the toughness is poor; meanwhile, the interface of the carbon fiber and the epoxy resin is connected in a chemical bonding mode, although the bonding strength is good, the fracture strain capacity of the interface is low, the crack propagation resistance is poor, and the toughness of the interface is poor. The low toughness interface can cause brittle failure of the material when external load is applied, and the stress transmission of the interface is influenced, so that the application of the epoxy resin in the field of carbon fiber bicycles is limited. Finally, since water is used as a solvent and diluent for the waterborne epoxy primer, its disadvantages are also related to the water's own characteristics. When the temperature is low and the relative humidity is high, the water is slowly volatilized, and the water is frozen at 0 ℃, so that the water-based anticorrosive paint can be constructed only when the temperature is higher than 5 ℃, the environment humidity of the paint film during curing is limited to be optimal between 40% and 60%, and the construction performance of the epoxy primer is greatly limited; this is also the reason why the maximum thickness of the non-foaming dry film of the current waterborne epoxy resin coating can only reach about 30 μm after being coated on a carbon fiber bicycle.
CN110408315A discloses a water-based gloss oil, a preparation method and an application thereof, wherein the water-based gloss oil comprises the following components in parts by weight: 35-55 parts of water-based hydroxyl acrylic acid dispersoid, 5-12 parts of water-based acrylic acid hardening emulsion, 12-20 parts of water-dispersible isocyanate curing agent, 0.5-1.5 parts of anti-UV (ultraviolet) auxiliary agent, 1-3.5 parts of anti-scratch hand feeling auxiliary agent and 20-30 parts of water; the water-based varnish provided by the invention has good scratch resistance, good appearance and glossiness, and can be applied to carbon fiber bicycles, but the water-based varnish has low adhesion to substrates.
CN107201135A discloses a preparation method of a water-based epoxy primer and an application of the water-based epoxy primer on a carbon fiber bicycle. However, the water-based epoxy primer has low hardness and a thin dry film thickness, and cannot be applied under a high humidity condition.
Therefore, the development of a water-based transparent epoxy primer for carbon fiber bicycles, which has high hardness, high film thickness, wide humidity application performance and rapid drying, is the focus of current research in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a water-based transparent epoxy primer and a preparation method and application thereof, in particular to a water-based transparent epoxy primer for carbon fiber bicycles. The invention provides the water-based transparent epoxy primer which has high hardness, high film thickness, wide humidity construction performance and quick drying; the special water-based transparent epoxy primer is suitable for carbon fiber bicycles, and provides easy-to-polish performance on the application layer.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present disclosure provides a waterborne clear epoxy primer comprising a component a, a component B, and a component C; the component A comprises a water-based epoxy resin; the component B comprises a curing agent, a composite defoaming agent, a wetting agent, a composite flatting agent, an anti-scraping auxiliary agent, a composite thickening agent and a composite solvent; the C component comprises water.
The invention adopts a three-component composite system, and all components are reasonably matched, so that the water-based transparent epoxy primer which has high hardness, high film thickness, wide humidity construction performance and quick drying property is obtained; the special water-based transparent epoxy primer is suitable for carbon fiber bicycles, and provides easy-to-polish performance on the application layer.
Wherein, the composite defoaming agent is used as a main component for eliminating bubbles, and the bubbles can be eliminated in the production and curtain coating processes: during the production process, bubbles are removed from the B component once generated, so that the bubbles are difficult to generate and maintain; in the using process, the composite defoaming agent can promote large bubbles and micro bubbles to be removed and burst in the leveling and drying process of the paint film, and the liquid paint is not easy to generate foams in the construction process.
The wetting agent is used in water-based coatings to enable better spreading on the substrate. The composite leveling agent can improve the leveling property of the epoxy primer, improve the glossiness of the epoxy primer, improve the uniformity of the primer and reduce the surface tension of the primer. The scratch resistant aid can further enhance the hardness of the epoxy primer.
After the composite thickening agent is added into a water-based epoxy primer suspension system, the composite thickening agent can form a three-dimensional network structure, so that a cross-linked copolymer macromolecular chain is rapidly expanded and stretched, the thixotropic flow property can be generated to prevent sedimentation and improve the sagging resistance, and the storage stability of the coating can be improved by the composite thickening agent. The composite solvent comprises solvents with different boiling points, and aims to realize gradient drying in a drying stage, so that wider humidity is provided for construction, and the surface flatness of the waterborne transparent epoxy primer can be ensured even under a rapid drying condition.
Preferably, the mass ratio of the component A, the component B and the component C is (5-7): 1-3):1, and preferably 6:2: 1.
The "5 to 7" may be, for example, 5, 5.2, 5.4, 5.6, 5.8, 6, 6.2, 6.4, 6.8, 7 or the like.
Here, "1 to 3" may be, for example, 5, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.8, 3 or the like.
The component A, the component B and the component C can further improve and control the hardness, the film thickness and the drying time in the proportion. When the amount of the component B is too small, the hardness of the coating film is lowered, and when the amount of the component B is too large, the flexibility of the coating film starts to decrease because the crosslinking density increases after the epoxy groups in the epoxy resin are sufficiently reacted, and the hardness of the coating film becomes too large and cracks easily occur. The component C is excessive, the viscosity of the water-based transparent epoxy primer is too thin, the adhesive force capability is poor, part of the primer flows under the action of gravity during construction, the drying time is long, and the primer film formed by drying is too thin; the component C is too little, the viscosity of the water-based transparent epoxy primer is too high, the primer is too thick, and the uniform spraying is difficult during construction.
Preferably, the viscosity of the aqueous epoxy resin is 1000-6000cp, and can be, for example, 1000cp, 2000cp, 3000cp, 4000cp, 5000cp, 6000cp and the like.
Optionally, the aqueous epoxy resin has a solids content of 50-60 wt%, such as 50 wt%, 51 wt%, 52 wt%, 53 wt%, 54 wt%, 55 wt%, 56 wt%, 57 wt%, 58 wt%, 59 wt%, 60 wt%, and the like.
Preferably, the waterborne epoxy resin is selected from any one or a combination of at least two of 6530-WH-57A, 6520-WH-53A, 6521-WH-53, 7528-WH-53A or 7520-WD-52A.
The waterborne epoxy resin is a Vast waterborne epoxy resin.
Preferably, the component B comprises the following components in percentage by mass based on the total mass of the component B being 100 percent: 30-50% of curing agent, 0.5-5% of composite defoaming agent, 0.5-3% of wetting agent, 3-10% of composite leveling agent, 4-9% of anti-scraping auxiliary agent, 0.5-5% of composite thickening agent and the balance of composite solvent.
The content of the curing agent is 30 to 50% based on 100% of the total mass of the component B, and may be, for example, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, or the like.
The content of the composite antifoaming agent is 0.5 to 5%, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 2%, 3%, 4%, 5%, etc., based on 100% by mass of the total B component.
The content of the wetting agent is 0.5 to 3%, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 2%, 3%, etc., based on 100% by mass of the total of the B component.
The content of the composite leveling agent is 3 to 10%, for example, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc., based on 100% by mass of the B component.
The content of the scratch resistance aid is 4 to 9%, for example, 4%, 5%, 6%, 7%, 8%, 9%, etc., based on 100% by mass of the total of the B component.
The content of the complex thickener is 0.5 to 5%, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 2%, 3%, 4%, 5%, etc., based on 100% by mass of the total of the B component.
Preferably, the curing agent is a water-based amine curing agent.
Preferably, the aqueous amine curing agent is selected from 8545-W-52 and/or 8530-W-75.
The aqueous amine curing agent is a spacious aqueous curing agent.
Preferably, the composite anti-foaming agent comprises a first anti-foaming agent and a second anti-foaming agent. The first defoaming agent is mainly used for eliminating micro bubbles and small bubbles, the second defoaming agent is mainly used for eliminating large bubbles, the first defoaming agent and the second defoaming agent are matched with each other and synergized, so that the large bubbles and the micro bubbles can be further promoted to rapidly separate and burst in the leveling and drying process of the paint film, and the liquid paint can not generate foams any more during construction.
Preferably, the mass ratio of the first defoaming agent to the second defoaming agent is (0.5-2: 1), and may be, for example, 0.5:1, 0.6:1, 0.8:1, 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1, 2:1, etc., preferably 1: 1.
Preferably, the first defoaming agent comprises any one of BYK-012, BYK-024, BYK-011, BYK-019 or BYK-022 or a combination of at least two thereof.
Preferably, the second defoaming agent comprises any one of BYK-1710, BYK-093, BYK-1798, BYK-1786 or BYK-1785 or a combination of at least two of the above.
Preferably, the wetting agent comprises any one of BYK-349, BYK-348, BYK-3455, BYK-346 or BYK-333 or a combination of at least two thereof.
Preferably, the composite leveling agent includes a first leveling agent and a second leveling agent. The first leveling agent is mainly used for promoting the gloss flatness of a paint film obtained by curing, and the second leveling agent is mainly used for promoting the solid uniformity of an epoxy primer and the paint film obtained by curing; the two components are matched with each other for synergism, so that the respective effects are achieved, the compatibility of the flatting agent and the epoxy resin is further improved, the surface tension between the primer and the base material is further reduced, the wettability of the primer to the base material is improved, the surface tension is homogenized as soon as possible, and the surface flow state is rapidly improved.
Preferably, the mass ratio of the first leveling agent to the second leveling agent is (2-5) (0.8-4), preferably 2: 1;
here, "2 to 5" may be, for example, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.
Here, "0.8 to 4" may be, for example, 0.8, 0.9, 1.5, 2, 2.5, 3, 3.5, 4 or the like.
Preferably, the first leveling agent comprises BYK-381 and/or BYK-380N.
Preferably, the second leveling agent comprises any one of BYK-3455, BYK-346, BYK-3441, BYK-3456 or BYK-342 or a combination of at least two thereof.
Preferably, the anti-scratch assistant comprises any one of BYK-331, BYK-378, BYK-3760 or BYK-307 or a combination of at least two of the above.
Preferably, the complex thickener includes a first thickener and a second thickener. The first thickener provides thixotropy to the primer, while the second thickener provides storage stability to the primer.
Preferably, the mass ratio of the first thickener to the second thickener is (0.5-2: 1), and may be, for example, 0.5:1, 0.6:1, 0.8:1, 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1, 2:1, etc., preferably 1: 1.
Preferably, the first thickener comprises any one of OPTIF L O-H7625VF, BYK-D420 or OPTIF L O-L1400 or a combination of at least two thereof.
Preferably, the second thickener comprises any one or a combination of at least two of RHEO L ATE 299, THIXATRO L P2100W, DISPAR L ON AQ-600, DISPAR L ON AQ-800 or DISPAR L ON AQ-330.
Preferably, the complex solvent includes a first solvent, a second solvent, and a third solvent.
Preferably, the mass ratio of the first solvent, the second solvent and the third solvent is (1-3):1:1, and may be, for example, 1:1:1, 1.2:1:1, 1.4:1:1, 1.6:1:1, 1.8:1:1, 2:1:1, 2.2:1:1, 2.4:1:1, 2.6:1:1, 2.8:1:1, 3:1:1, etc., preferably 2:1: 1.
Preferably, the boiling point of the first solvent is less than that of the second solvent and less than that of the third solvent, and the three solvents with the boiling points are compounded, so that the solvents with different boiling points can realize gradient volatilization in the drying process, the phenomenon of primer edge deposition is effectively inhibited, the flatness and uniformity of a paint film obtained by curing are improved, and a wider humidity range can be provided for construction.
Preferably, the boiling point of the first solvent is 78-125 deg.C, such as 78 deg.C, 80 deg.C, 85 deg.C, 90 deg.C, 95 deg.C, 100 deg.C, 105 deg.C, 110 deg.C, 115 deg.C, 120 deg.C, 125 deg.C.
Preferably, the second solvent has a boiling point of 130-166 ℃, for example, 130 ℃, 135 ℃, 140 ℃, 145 ℃, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 166 ℃ and the like.
Preferably, the boiling point of the third solvent is 170-230 ℃, for example, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃ and the like can be used.
Preferably, the first solvent comprises any one of ethanol, isopropanol, isobutanol, n-butanol, propylene glycol methyl ether or ethylene glycol methyl ether or a combination of at least two thereof;
preferably, the second solvent comprises propylene glycol methyl ether acetate or diacetone alcohol;
preferably, the third solvent comprises any one of propylene glycol butyl ether, ethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, or diethylene glycol butyl ether or a combination of at least two thereof.
In a second aspect, the present invention provides a method for preparing the water-based transparent epoxy primer according to the first aspect, the method comprising the steps of:
(1) mixing and stirring a curing agent, a composite defoaming agent, a wetting agent, a composite leveling agent, an anti-scraping auxiliary agent, a composite thickening agent and a composite solvent to obtain a component B;
(2) and mixing and stirring the component A, the component B and the component C to obtain the water-based transparent epoxy primer.
Preferably, the rotation speed of the mixing and stirring in step (1) is 500-.
Preferably, the mixing and stirring in the step (1) comprises the following specific steps: firstly, the curing agent is mixed with the composite solvent, and is uniformly stirred at the rotation speed of 500-1000r/min (for example, 500r/min, 600r/min, 700r/min, 800r/min, 900r/min, 1000r/min and the like), then is mixed with the composite antifoaming agent, the wetting agent, the composite leveling agent and the anti-scraping auxiliary agent, is stirred at the rotation speed of 500-1000r/min (for example, 500r/min, 600r/min, 700r/min, 800r/min, 900r/min, 1000r/min and the like) for 5-10min (for example, 5min, 6min, 7min, 8min, 9min, 10min and the like), and is finally mixed with the composite thickening agent, and is mixed at the rotation speed of 500-1000r/min (for example, 500r/min, 600r/min, 700r/min, 800r/min, 9min, 10min and the like), 900r/min, 1000r/min, etc.) for 5-10min (for example, 5min, 6min, 7min, 8min, 9min, 10min, etc.) to obtain the component B.
Preferably, the component B obtained in the step (1) is further subjected to filtration treatment.
Preferably, the filtration treatment is performed by using filter cloth, and the mesh number of the filter cloth is 100 meshes, 300 meshes, for example, 100 meshes, 120 meshes, 140 meshes, 160 meshes, 180 meshes, 200 meshes, 220 meshes, 240 meshes, 260 meshes, 280 meshes, 300 meshes, and the like, preferably 200 meshes.
Preferably, the rotation speed of the mixing and stirring in the step (2) is 1000-.
Preferably, the mixing and stirring in the step (2) comprises the following specific steps: mixing the component A and the component B, stirring at a rotation speed of 1000-2000r/min (such as 1000r/min, 1200r/min, 1400r/min, 1600r/min, 1800r/min, 2000r/min, etc.) for 5-10min (such as 5min, 6min, 7min, 8min, 9min, 10min, etc.), mixing with the component C, stirring at a rotation speed of 1000-2000r/min (such as 1000r/min, 1200r/min, 1400r/min, 1600r/min, 1800r/min, 2000r/min, etc.) for 2-5min (such as 2min, 2.5min, 3min, 3.5min, 4min, 4.5min, 5min, etc.), and obtaining the waterborne transparent epoxy primer;
preferably, the water-based transparent epoxy primer obtained in the step (2) is further subjected to filtration and standing.
Preferably, the filtration treatment is performed by using filter cloth, and the mesh number of the filter cloth is 50-200 meshes, for example, 50 meshes, 70 meshes, 90 meshes, 100 meshes, 110 meshes, 120 meshes, 140 meshes, 160 meshes, 180 meshes, 200 meshes and the like, preferably 100 meshes.
Preferably, the standing time is 2-3min, such as 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3min, etc.
Preferably, the preparation method of the water-based transparent epoxy primer comprises the following steps:
(1) firstly, mixing a curing agent with a composite solvent, uniformly stirring at the rotation speed of 500 plus one 1000r/min, then mixing with a composite defoaming agent, a wetting agent, a composite leveling agent and an anti-scraping auxiliary agent, stirring at the rotation speed of 500 plus one 1000r/min for 5-10min, finally mixing with a composite thickening agent, stirring at the rotation speed of 500 plus one 1000r/min for 5-10min, and filtering by adopting 100 plus one 300-mesh filter cloth to obtain the component B;
(2) mixing the component A and the component B, stirring for 5-10min at the rotating speed of 1000-.
In a third aspect, the present invention provides a use of the water-based transparent epoxy primer according to the first aspect in carbon fiber bicycle protection.
Compared with the prior art, the invention has the following beneficial effects:
(1) the paint film solidified by the water-based transparent epoxy primer has the advantages of high hardness, high film thickness, high gloss and quick drying, and the water-based transparent epoxy primer can be constructed under wider humidity;
(2) the water-based transparent epoxy primer is particularly suitable for protection of carbon fiber bicycles, and provides easy polishing performance of a paint film on the application level;
(3) the hardness of a paint film formed by the water-based transparent epoxy primer is H-3H, the maximum thickness of a non-foaming dry film is 40-60 mu m, the curing time of the paint film reaching the hardness of 2H is within 60-100min, the applicable humidity is 30-85%, and the glossiness is 85-95.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a water-based transparent epoxy primer, which comprises a component A, a component B and a component C; the component A is water-based epoxy resin (6530-WH-57A), the component B comprises the following components in percentage by mass, the component C is deionized water, and the mass ratio of the component A to the component B to the component C is 6:2: 1;
the preparation method of the water-based transparent epoxy primer comprises the following steps:
(1) firstly, mixing a curing agent (8545-W-52) with a composite solvent (ethanol, propylene glycol methyl ether acetate and dipropylene glycol butyl ether), uniformly stirring at the rotating speed of 800r/min, then mixing with a composite antifoaming agent (BYK-012 and BYK-1710), a wetting agent (BYK-349), a composite leveling agent (BYK-381, BYK-3455) and an anti-scratch auxiliary agent (BYK-331), stirring at the rotating speed of 800r/min for 5min, finally mixing with a composite thickening agent (OPTIF L O-H76 7625VF and RHEO L ATE 299), stirring at the rotating speed of 800r/min for 10min, and filtering by using a filter cloth of 200 meshes to obtain a component B;
(2) mixing the component A (6530-WH-57A) and the component B, stirring at the rotating speed of 1500r/min for 8min, then mixing with the component C (deionized water), stirring at the rotating speed of 800r/min for 3min, filtering by using 100-mesh filter cloth, and standing for 2min, wherein the mass ratio of the component A, the component B and the component C is 6:2:1, so as to obtain the waterborne transparent epoxy primer.
Example 2
The embodiment provides a water-based transparent epoxy primer, which comprises a component A, a component B and a component C; the component A is water-based epoxy resin (6521-WH-53), the component B comprises the following components in percentage by mass, the component C is deionized water, and the mass ratio of the component A to the component B to the component C is 6:2: 1;
the preparation method of the water-based transparent epoxy primer comprises the following steps:
(1) firstly, mixing a curing agent (8530-W-75) with a composite solvent (isopropanol, propylene glycol monomethyl ether acetate and diethylene glycol monobutyl ether), uniformly stirring at the rotation speed of 1000r/min, then mixing with a composite defoaming agent (BYK-024 and BYK-1798), a wetting agent (BYK-3445), a composite leveling agent (BYK-380N and BYK-3441) and an anti-scratch auxiliary agent (BYK-3760), stirring at the rotation speed of 1000r/min for 5min, finally mixing with a composite thickening agent (BYK-D420 and PAR L ON AQ-600), stirring at the rotation speed of 500r/min for 10min, and filtering by using a filter cloth of 200 meshes to obtain a component B;
(2) mixing the component A (6521-WH-53) and the component B, stirring at the rotating speed of 1000r/min for 10min, then mixing with the component C (deionized water), stirring at the rotating speed of 800r/min for 3min, filtering by using 100-mesh filter cloth, and standing for 3min, wherein the mass ratio of the component A to the component B to the component C is 6:2:1, so as to obtain the waterborne transparent epoxy primer.
Example 3
The embodiment provides a water-based transparent epoxy primer, which comprises a component A, a component B and a component C; the component A is waterborne epoxy resin (7520-WD-52A), the component B comprises the following components in percentage by mass, the component C is deionized water, and the mass ratio of the component A to the component B to the component C is 6:2: 1;
the preparation method of the water-based transparent epoxy primer comprises the following steps:
(1) firstly, mixing a curing agent (8530-W-75) with a composite solvent (propylene glycol methyl ether, diacetone alcohol and diethylene glycol butyl ether), uniformly stirring at the rotating speed of 500r/min, then mixing with a composite defoaming agent (BYK-019 and BYK-1785), a wetting agent (BYK-333), a composite leveling agent (BYK-380N and BYK-342) and an anti-scratch auxiliary agent (BYK-307), stirring at the rotating speed of 500r/min for 10min, finally mixing with a composite thickening agent (OPTIF L O-L1400 and PAR DIS L ON AQ-330), stirring at the rotating speed of 1000r/min for 5min, and filtering with 200-mesh filter cloth to obtain a component B;
(2) mixing the component A (waterborne epoxy resin 7520-WD-52A) and the component B, stirring for 5min at the rotating speed of 2000r/min, then mixing with the component C (deionized water), stirring for 2min at the rotating speed of 2000r/min, filtering by using 100-mesh filter cloth, and standing for 2min, wherein the mass ratio of the component A, the component B and the component C is 6:2:1, so as to obtain the waterborne transparent epoxy primer.
Example 4
This example provides a water-based transparent epoxy primer, which is different from example 1 only in that the mass ratio of the component A, the component B and the component C is 5:3:1, and the contents of other components and the preparation method are the same as those of example 1.
Example 5
This example provides a water-based transparent epoxy primer, which is different from example 1 only in that the mass ratio of the component A, the component B and the component C is 7:1:1, and the contents of other components and the preparation method are the same as those of example 1.
Example 6
This example provides a water-based clear epoxy primer, which is different from example 1 only in that the water-based epoxy resin (6530-WH-57A) is replaced by an epoxy resin with a solid content of 45 wt%, and the contents of other components and the preparation method are the same as those of example 1.
Example 7
The present example provides a water-based transparent epoxy primer, which is different from example 1 only in that the content of BYK-012 is increased to 1.5%, the content of BYK-1710 is decreased to 0.5%, and the content of other components and the preparation method are the same as example 1.
Example 8
The present example provides a water-based transparent epoxy primer, which is different from example 1 only in that the content of BYK-012 is increased to 0.5%, the content of BYK-1710 is decreased to 1.5%, and the content of other components and the preparation method are the same as example 1.
Example 9
This example provides a water-based transparent epoxy primer, which is different from example 1 only in that the content of BYK-380N is reduced to 0.5%, the content of BYK-3441 is increased to 2.5%, and the contents of other components and the preparation method are the same as example 1.
Example 10
This example provides a water-based transparent epoxy primer, which is different from example 1 only in that the content of BYK-380N is reduced to 2.5%, the content of BYK-3441 is increased to 0.5%, and the contents of other components and the preparation method are the same as example 1.
Example 11
This example provides a waterborne clear epoxy primer that differs from example 1 only in that the OPTIF L O-H7625VF content is reduced to 0.5%, the RHEO L ATE 299 content is increased to 1.5%, and the other components and preparation method are the same as example 1.
Example 12
This example provides a waterborne clear epoxy primer that differs from example 1 only in that the OPTIF L O-H7625VF content is increased to 1.5%, the RHEO L ATE 299 content is decreased to 0.5%, the other components are present and the preparation method is the same as in example 1.
Example 13
This example provides a waterborne clear epoxy primer, which differs from example 1 only in that the RHEO L ATE 299 content is increased to 0.5%, the OPTIF L O-H7625VF content is reduced to 1.5%, and the other components and preparation method are the same as example 1.
Example 14
This example provides a water-based transparent epoxy primer, which is different from example 1 only in that dipropylene glycol butyl ether is not added to the component B, the ethanol content is increased to 30%, the propylene glycol methyl ether acetate content is increased to 18%, and the contents of other components and the preparation method are the same as example 1.
Example 15
This example provides a water-based clear epoxy primer, which is different from example 1 only in that propylene glycol methyl ether acetate is not added to the component B, the ethanol content is increased to 30%, the dipropylene glycol butyl ether content is increased to 18%, and the contents and preparation methods of other components are the same as example 1.
Example 16
This example provides a water-based clear epoxy primer, which is different from example 1 only in that no ethanol is added to the component B, the propylene glycol methyl ether acetate content is increased to 24%, the dipropylene glycol butyl ether content is increased to 24%, and the contents and preparation methods of other components are the same as example 1.
Example 17
This example provides a water-based clear epoxy primer, which is different from example 1 only in that propylene glycol methyl ether acetate is replaced by isobutanol, dipropylene glycol butyl ether is replaced by propylene glycol methyl ether, and the contents of other components and the preparation method are the same as those of example 1.
Comparative example 1
This comparative example provides a water-based transparent epoxy primer, which is different from example 1 only in that the component C is not added, the component A and the component B are mixed at a ratio of 6:2, and the contents of other components and the preparation method are the same as those of example 1.
Comparative example 2
The comparative example provides a water-based transparent epoxy primer, which is different from the epoxy primer in example 1 only in that a component B does not use a composite defoaming agent, only 2% of a first defoaming agent BYK-012 is added, and the contents of other components and the preparation method are the same as those in example 1.
Comparative example 3
The comparative example provides a water-based transparent epoxy primer, which is different from the example 1 only in that the component B does not use a composite defoaming agent, only 2% of a second defoaming agent BYK-1710 is added, and the contents of other components and the preparation method are the same as those of the example 1.
Comparative example 4
The comparative example provides a water-based transparent epoxy primer, which is different from the example 1 only in that the component B does not use a composite leveling agent, only 3 percent of the first leveling agent BYK-381 is added, and the contents of other components and the preparation method are the same as those of the example 1.
Comparative example 5
The comparative example provides a water-based transparent epoxy primer, which is different from the epoxy primer in example 1 only in that the component B does not use a composite leveling agent, only 3 percent of a second leveling agent BYK-3455 is added, and the contents of other components and the preparation method are the same as those of example 1.
Comparative example 6
This comparative example provides a water-based clear epoxy primer, which differs from example 1 only in that the component B does not use a composite thickener, only 2% of the first thickener OPTIF L O-H7625VF is added, and the contents of other components and the preparation method are the same as example 1.
Comparative example 7
This comparative example provides a water-borne clear epoxy primer that differs from example 1 only in that component B does not use a complex thickener, only 2% of a second thickener, RHEO L ATE 299, is added, and the other component contents and preparation method are the same as example 1.
Comparative example 8
This comparative example provides a water-based transparent epoxy primer, which is different from example 1 only in that the component B does not use a complex solvent, only 48% of ethanol as a first solvent is added, and the contents of other components and the preparation method are the same as those of example 1.
Comparative example 9
The comparative example provides a water-based transparent epoxy primer, which is different from the epoxy primer in example 1 only in that the component B does not use a composite solvent, only 48 percent of second solvent propylene glycol methyl ether acetate is added, and the contents of other components and the preparation method are the same as those of the epoxy primer in example 1.
Comparative example 10
This comparative example provides a water-based transparent epoxy primer, which is different from example 1 only in that the component B does not use a composite solvent, only 48% of dipropylene glycol butyl ether as a third solvent is added, and the contents of other components and the preparation method are the same as those of example 1.
Performance testing
The performance tests were performed on the waterborne clear epoxy primers provided in examples 1-17 above and the waterborne clear epoxy primers provided in comparative examples 1-10; wherein, the hardness: testing the hardness by adopting a Mitsubishi pencil; adhesion force: the adhesion is tested by the Baige method according to the method specified in the national standard GB/T9286-1998, the unit is: a stage; the maximum thickness of the non-foamed dry film is tested according to the method of GB/T13452.2-2008, units: mu m; gloss: the general 60-degree gloss meter (color spectrum gloss meter CS-380) test shows that the specific test results are shown in Table 1:
TABLE 1
As can be seen from the test data in Table 1, the hardness of the paint film formed by the water-based transparent epoxy primer is H-3H, the maximum thickness of the non-foaming dry film is 40-60 mu m, the curing time is within 60-100min when the paint film reaches the hardness of 2H, the applicable humidity is 30-85%, and the glossiness is 85-95. The components in the waterborne transparent epoxy primer disclosed by the invention are matched with each other, the synergistic effect is realized, the cured paint film has the advantages of high hardness, high film thickness, high gloss and quick drying, and the waterborne transparent epoxy primer can be constructed under wider humidity.
As is clear from the comparison between examples 1 and 4 to 5, when the amount of the component B is too small, the hardness of the coating film decreases, and when the amount of the component B is too large, the epoxy group in the epoxy resin is sufficiently reacted, the crosslinking density increases, and the hardness of the coating film becomes too large, and cracks are liable to occur.
As is clear from the comparison between example 1 and comparative example 1, the viscosity of the water-based transparent epoxy primer was too high without adding the component C, the primer was too thick, the coating was difficult to be uniformly applied during the application, and the coating film thickness was not uniform.
As can be seen from the comparison between the example 1 and the comparative examples 2 and 3, the first defoaming agent is mainly used for eliminating the micro bubbles and the small bubbles, the second defoaming agent is mainly used for eliminating the large bubbles, and the first defoaming agent and the second defoaming agent are matched with each other to synergistically enhance the synergistic effect, so that the large bubbles and the micro bubbles can be further promoted to rapidly separate and burst in the leveling and drying process of the paint film, and the cured dry film can reach the required maximum thickness.
From the comparison of example 1 with comparative examples 4 and 5, it is clear that the first levelling agent is mainly used to promote gloss evenness of the cured paint film, while the second levelling agent is mainly used to promote solid evenness of the cured epoxy primer and the cured paint film, and the absence of either levelling agent not only reduces gloss and evenness, but also leads to an increase in curing time to a hardness of 2H due to the inability to achieve rapid homogenization of the coating tension.
As is clear from comparison between example 1 and comparative examples 6 and 7, the first thickener provides thixotropy to the primer and the second thickener provides storage stability to the primer, the primer lacking either thickener is liable to undergo sedimentation to cause unevenness in the formed coating film, the primer is dried in the thinner part and the primer is not dried in the thicker part to attain the same hardness, and sag resistance during application is poor.
As can be seen from the comparison between the example 1 and the comparative examples 8 to 10, the invention adopts three solvents with boiling points for compounding, so that the solvents with different boiling points can realize gradient volatilization in the drying process, the phenomenon of primer edge deposition is effectively inhibited, the leveling and uniform of a paint film obtained by curing is improved, and the ideal effect cannot be achieved due to the lack of any solvent with boiling point gradient.
The applicant states that the present invention is illustrated by the above examples to show the water-based transparent epoxy primer and the preparation method and application thereof, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by relying on the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The water-based transparent epoxy primer is characterized by comprising a component A, a component B and a component C; the component A comprises a water-based epoxy resin; the component B comprises a curing agent, a composite defoaming agent, a wetting agent, a composite flatting agent, an anti-scraping auxiliary agent, a composite thickening agent and a composite solvent; the C component comprises water.
2. The water-based transparent epoxy primer according to claim 1, wherein the mass ratio of the A component, the B component and the C component is (5-7): 1-3): 1.
3. The water-based transparent epoxy primer as claimed in claim 1 or 2, wherein the viscosity of the water-based epoxy resin is 1000-6000 cp;
preferably, the solid content of the waterborne epoxy resin is 50-60 wt%;
preferably, the waterborne epoxy resin is selected from any one or a combination of at least two of 6530-WH-57A, 6520-WH-53A, 6521-WH-53, 7528-WH-53A or 7520-WD-52A.
4. The water-based transparent epoxy primer according to any one of claims 1 to 3, wherein the B component comprises, in mass percent, based on 100% of the total mass of the B component: 30-50% of curing agent, 0.5-5% of composite defoaming agent, 0.5-3% of wetting agent, 3-10% of composite leveling agent, 4-9% of anti-scraping auxiliary agent, 0.5-5% of composite thickening agent and the balance of composite solvent.
5. The waterborne clear epoxy primer of any one of claims 1-4, wherein the curing agent is a waterborne amine curing agent;
preferably, the aqueous amine curing agent is selected from 8545-W-52 and/or 8530-W-75;
preferably, the composite antifoaming agent comprises a first antifoaming agent and a second antifoaming agent;
preferably, the mass ratio of the first defoaming agent to the second defoaming agent is (0.5-2) to 1, preferably 1: 1;
preferably, the first defoaming agent comprises any one or a combination of at least two of BYK-012, BYK-024, BYK-011, BYK-019 or BYK-022;
preferably, the second defoaming agent comprises any one or a combination of at least two of BYK-1710, BYK-093, BYK-1798, BYK-1786 or BYK-1785;
preferably, the wetting agent comprises any one of BYK-349, BYK-348, BYK-3455, BYK-346 or BYK-333 or a combination of at least two thereof.
6. The aqueous clear epoxy primer according to any one of claims 1-5, wherein the composite leveling agent comprises a first leveling agent and a second leveling agent;
preferably, the mass ratio of the first leveling agent to the second leveling agent is (2-5) (0.8-4), preferably 2: 1;
preferably, the first leveling agent comprises BYK-381 and/or BYK-380N;
preferably, the second leveling agent comprises any one or a combination of at least two of BYK-3455, BYK-346, BYK-3441, BYK-3456 or BYK-342;
preferably, the anti-scratch auxiliary agent comprises any one or a combination of at least two of BYK-331, BYK-378, BYK-3760 or BYK-307;
preferably, the complex thickener comprises a first thickener and a second thickener;
preferably, the mass ratio of the first thickener to the second thickener is (0.5-2) to 1, preferably 1: 1;
preferably, the first thickener comprises any one of OPTIF L O-H7625VF, BYK-D420 or OPTIF L O-L1400 or a combination of at least two thereof;
preferably, the second thickener comprises any one or a combination of at least two of RHEO L ATE 299, THIXATRO L P2100W, DISPAR L ON AQ-600, DISPAR L ON AQ-800 or DISPAR L ON AQ-330.
7. The waterborne transparent epoxy primer of any one of claims 1-6, wherein the composite solvent comprises a first solvent, a second solvent, and a third solvent;
preferably, the mass ratio of the first solvent to the second solvent to the third solvent is (1-3) to 1:1, preferably 2:1: 1;
preferably, the boiling point of the first solvent < the boiling point of the second solvent < the boiling point of the third solvent;
preferably, the boiling point of the first solvent is 78-125 ℃;
preferably, the second solvent has a boiling point of 130-166 ℃;
preferably, the boiling point of the third solvent is 170-230 ℃;
preferably, the first solvent comprises any one of ethanol, isopropanol, isobutanol, n-butanol, propylene glycol methyl ether or ethylene glycol methyl ether or a combination of at least two thereof;
preferably, the second solvent comprises propylene glycol methyl ether acetate or diacetone alcohol;
preferably, the third solvent comprises any one of propylene glycol butyl ether, ethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, or diethylene glycol butyl ether or a combination of at least two thereof.
8. The method of preparing the waterborne clear epoxy primer according to any one of claims 1 to 7, characterized in that the method comprises the steps of:
(1) mixing and stirring a curing agent, a composite defoaming agent, a wetting agent, a composite leveling agent, an anti-scraping auxiliary agent, a composite thickening agent and a composite solvent to obtain a component B;
(2) and mixing and stirring the component A, the component B and the component C to obtain the water-based transparent epoxy primer.
9. The preparation method according to claim 8, wherein the rotation speed of the mixing and stirring in step (1) is 500-1000r/min, and the time of the mixing and stirring is 10-30 min;
preferably, the mixing and stirring in the step (1) comprises the following specific steps: firstly, mixing a curing agent with a composite solvent, uniformly stirring at the rotating speed of 500 plus one 1000r/min, then mixing with a composite defoaming agent, a wetting agent, a composite leveling agent and an anti-scraping auxiliary agent, stirring at the rotating speed of 500 plus one 1000r/min for 5-10min, finally mixing with a composite thickening agent, and stirring at the rotating speed of 500 plus one 1000r/min for 5-10min to obtain the component B;
preferably, the component B obtained in the step (1) is further subjected to filtration treatment;
preferably, the filtration treatment adopts filter cloth for filtration, and the mesh number of the filter cloth is 100-300 meshes, preferably 200 meshes;
preferably, the rotation speed of the mixing and stirring in the step (2) is 1000-;
preferably, the mixing and stirring in the step (2) comprises the following specific steps: mixing the component A and the component B, stirring for 5-10min at the rotating speed of 1000-;
preferably, the water-based transparent epoxy primer obtained in the step (2) needs to be filtered and kept still;
preferably, the filtration treatment adopts filter cloth for filtration, and the mesh number of the filter cloth is 50-200 meshes, preferably 100 meshes;
preferably, the standing time is 2-3 min;
preferably, the preparation method of the water-based transparent epoxy primer comprises the following steps:
(1) firstly, mixing a curing agent with a composite solvent, uniformly stirring at the rotation speed of 500 plus one 1000r/min, then mixing with a composite defoaming agent, a wetting agent, a composite leveling agent and an anti-scraping auxiliary agent, stirring at the rotation speed of 500 plus one 1000r/min for 5-10min, finally mixing with a composite thickening agent, stirring at the rotation speed of 500 plus one 1000r/min for 5-10min, and filtering by adopting 100 plus one 300-mesh filter cloth to obtain the component B;
(2) mixing the component A and the component B, stirring for 5-10min at the rotating speed of 1000-.
10. Use of the aqueous clear epoxy primer according to any one of claims 1 to 7 in carbon fiber bicycle protection.
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| CN115353784A (en) * | 2022-08-18 | 2022-11-18 | 东莞市樱之蓝新材料科技有限公司 | Water-based carbon fiber paint and preparation method thereof |
| CN115433500A (en) * | 2022-08-24 | 2022-12-06 | 广东弘方涂料有限公司 | Epoxy anticorrosive primer and preparation method and application thereof |
| CN115595027A (en) * | 2022-09-23 | 2023-01-13 | 广州集泰化工股份有限公司（Cn） | Water-based two-component acrylic acid modified epoxy primer and preparation method and application thereof |
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Application publication date: 20200728 |