CN113122103A - Imitation electroplating powder coating and preparation method thereof - Google Patents
Imitation electroplating powder coating and preparation method thereof Download PDFInfo
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- CN113122103A CN113122103A CN201911400179.9A CN201911400179A CN113122103A CN 113122103 A CN113122103 A CN 113122103A CN 201911400179 A CN201911400179 A CN 201911400179A CN 113122103 A CN113122103 A CN 113122103A
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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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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
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- 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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- 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
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/38—Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention relates to the technical field of powder coating and a preparation method thereof, in particular to an imitation electroplating powder coating, which comprises the following components: 30-40 parts of epoxy resin, 10-15 parts of phenolic aldehyde modified epoxy resin, 30-40 parts of unsaturated polyester resin, 1-5 parts of filler, 0.5-1.2 parts of aldehyde ketone polycondensation resin, 6-12 parts of aluminum paste, 0.3-0.5 part of dispersing agent and 0.2-0.4 part of flatting agent; 1-5 parts of a curing agent. The preparation method comprises the following steps: kneading, extruding and crushing the epoxy resin and the filler, then bonding, curing and crushing the other materials, and mixing, stirring and dispersing the powder to obtain the imitation electroplating powder coating. The invention solves the problems of poor dispersion effect of metal powder in epoxy resin and incapability of directional arrangement in the prior art, and the adopted aldehyde-ketone polycondensation resin has the effect of directional arrangement of aluminum paste, so that the arrangement regularity of the aluminum paste can be improved, and the imitation electroplating coating obtained by spraying has good flatness and good mirror effect.
Description
Technical Field
The invention relates to the technical field of powder coatings and preparation methods thereof, in particular to an imitation electroplating powder coating and a preparation method thereof.
Background
The powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler, auxiliary agent and the like. Unlike conventional solvent-based coatings and water-based coatings, the dispersion medium is not a solvent and water, but air. It has the characteristics of no solvent pollution, 100 percent film forming and low energy consumption. Powder coatings fall into two broad categories, thermoplastic and thermosetting. The appearance (gloss and leveling) of the coating film of the thermoplastic powder coating is poor, and the adhesion with metal is also poor. Thermosetting powder paint takes thermosetting synthetic resin as a film forming substance, and the resin is firstly melted in the drying process and then solidified into a flat and hard coating after chemical crosslinking.
The thermosetting powder paint consists of thermosetting resin, curing agent, pigment, stuffing, assistant, etc. Thermosetting powder coatings include epoxy, polyester, and acrylic resins.
The thermosetting powder coating adopts metal powder such as aluminum, copper and the like as pigment, and a coating formed by the obtained powder coating has high gloss and electroplating-simulated mirror effect; thus can replace electroplating and be used for decorating products such as furniture, household appliances, automobiles and the like.
In the prior art, metal powder such as aluminum, copper and the like serving as pigment has poor dispersion effect in epoxy resin, and directional arrangement cannot be realized, so that the surface flatness of the imitation electroplating material is poor.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a plating-simulated powder coating for solving the problems of poor dispersion effect of metal powder in epoxy resin and incapability of directional arrangement in the prior art, and also provides a preparation method of the plating-simulated powder coating. According to the invention, the epoxy resin and the unsaturated polyester resin are used as base materials, the phenolic aldehyde modified epoxy resin, the filler, the aldehyde ketone polycondensation resin and the aluminum paste are added into the base materials according to a certain proportion, the aldehyde ketone polycondensation resin has an effect of enabling the aluminum paste to be directionally arranged, so that the arrangement regularity of the aluminum paste can be improved, and the imitation electroplating coating obtained by spraying has good flatness and a good mirror surface effect.
In order to attain the above and other related objects,
the invention provides an imitation electroplating powder coating, which comprises the following components in parts by weight: 30-40 parts of epoxy resin, 10-15 parts of phenolic aldehyde modified epoxy resin, 30-40 parts of unsaturated polyester resin, 1-5 parts of filler, 0.5-1.2 parts of aldehyde ketone polycondensation resin, 6-12 parts of aluminum paste, 0.3-0.5 part of dispersing agent and 0.2-0.4 part of flatting agent; 1-5 parts of a curing agent.
The epoxy resin and the unsaturated polyester resin are used as base materials, the phenolic aldehyde modified epoxy resin, the filler, the aldehyde ketone polycondensation resin and the aluminum paste are added into the base materials according to a certain proportion, the aldehyde ketone polycondensation resin has an effect of enabling the aluminum paste to be directionally arranged, so that the arrangement regularity of the aluminum paste can be improved, and the imitation electroplating coating obtained by spraying has good flatness and a good mirror surface effect; in addition, the aldehyde ketone polycondensation resin has the advantages of quick drying, glossiness, adhesive force, leveling property, pigment wetting property, weather resistance and the like, and the leveling property of the powder coating can also be improved. The filler can enhance the brightness of the imitation electroplating coating and can also increase the mechanical strength of the imitation electroplating coating. The phenolic aldehyde modified epoxy resin can improve the overall corrosion resistance without influencing the leveling property.
In an embodiment of the invention, the imitation electroplating powder coating comprises the following components in parts by weight: 35-38 parts of epoxy resin, 12-15 parts of phenolic aldehyde modified epoxy resin, 33-35 parts of unsaturated polyester resin, 2-4 parts of filler, 0.8-1.0 part of aldehyde ketone polycondensation resin, 8-10 parts of aluminum paste, 0.3-0.5 part of dispersing agent and 0.2-0.4 part of flatting agent; 1-5 parts of a curing agent.
In an embodiment of the present invention, the phenolic-modified epoxy resin includes 20 to 30% by mass of a thermosetting phenolic resin and 70 to 80% by mass of a brominated diphenol propane epoxy resin.
Brominated bisphenol-A epoxy resin is also called brominated bisphenol-A epoxy resin and is bisphenol-A glycidyl ether containing bromine. The product category is mainly tetrabromobisphenol A epoxy resin or tetrabromobisphenol A diglycidyl ether. The brominated diphenol propane epoxy resin has the advantages of good flame retardant property, bonding property, thermal stability, low toxicity, low price, safe use and good performance balance.
The phenolic aldehyde modified epoxy resin comprises thermosetting phenolic resin and brominated diphenol propane epoxy resin, so that the powder coating has a certain flame retardant effect and can widen the application range of the powder coating.
In an embodiment of the present invention, the phenolic-modified epoxy resin includes 25 to 28 mass% of a thermosetting phenolic resin and 72 to 75 mass% of a brominated diphenol propane epoxy resin.
In one embodiment of the present invention, the epoxy resin is at least one of epoxy resin CYD-017, epoxy resin CYD-019, epoxy resin CYD-020N and epoxy resin CYD-014;
the unsaturated polyester resin is at least one of unsaturated polyester resin 195, unsaturated polyester resin 118 and unsaturated polyester resin 193;
the aldehyde ketone polycondensation resin is at least one of aldehyde ketone resin 120 and aldehyde ketone resin a 81;
the dispersant is at least one of dispersant W-3060, dispersant W-3050 and dispersant W-3035;
the leveling agent is at least one of hydrogenated castor oil and polyvinyl butyral;
the filler is barite;
the curing agent is at least one of ethylenediamine, diethylenetriamine and triethylene tetramine.
The barite can improve the brightness of the powder coating.
In an embodiment of the invention, the aluminum paste includes 60 to 80% by mass of aluminum powder, and the aluminum powder has a particle size of 20 to 50 μm. The particle size of the aluminum powder is controlled to be 20-50 mu m, so that a flat plating-imitating surface can be formed conveniently. The mass fraction of aluminum powder in the aluminum paste is controlled to be 60-80%, so that the aluminum paste is more convenient to disperse.
In a second aspect of the present invention, there is provided a method for preparing the imitation electroplating powder coating, comprising the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to a weight part ratio for kneading and dispersing, adding the mixture into a double-screw extruder, extruding and tabletting at a temperature of 90-100 ℃, and crushing the sheet to obtain powder A with a particle size of less than or equal to 100 microns for later use;
adding phenolic aldehyde modified epoxy resin, unsaturated polyester resin, aldehyde ketone polycondensation resin, a curing agent, a dispersing agent, a flatting agent and aluminum paste into a bonding machine according to the weight part ratio for bonding, adding the mixture into an airflow curing machine, curing into a sheet under the conditions that the temperature is 140-200 ℃ and the air pressure is 1.4-1.6 Mpa, and crushing the sheet to obtain powder B with the particle size being less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer, and stirring and dispersing to obtain the imitation electroplating powder coating.
In the preparation process of the imitation electroplating powder coating, the epoxy resin and the filler are kneaded and dispersed, so that the filler and the epoxy resin (base material) are uniformly mixed. The phenolic aldehyde modified epoxy resin, the unsaturated polyester resin, the aldehyde ketone polycondensation resin, the curing agent, the dispersing agent, the flatting agent and the aluminum paste are bonded in a bonding machine and then cured by adopting an airflow curing machine, and the cured sheet is crushed to be used as a raw material of the powder coating. The whole preparation process of the powder coating is simple and is suitable for large-scale production.
In an embodiment of the invention, in the first step, the mixing temperature of the internal mixer is 70 to 80 ℃, the rotation speed is 50 to 60r/min, and the dispersion time is 5 to 10 min.
In an embodiment of the present invention, in the second step, the rotation speed of the bonding machine is 500-600 r/min, and the bonding time is 5-10 min.
In an embodiment of the invention, the rotation speed of the high-speed mixer in step three is 700 to 900r/min, and the mixing time is 30 to 45 min.
As mentioned above, the imitation electroplating powder coating and the preparation method thereof have the following beneficial effects: the epoxy resin and the unsaturated polyester resin are used as base materials, the phenolic aldehyde modified epoxy resin, the filler, the aldehyde ketone polycondensation resin and the aluminum paste are added into the base materials according to a certain proportion, the aldehyde ketone polycondensation resin has an effect of enabling the aluminum paste to be directionally arranged, so that the arrangement regularity of the aluminum paste can be improved, and the imitation electroplating coating obtained by spraying has good flatness and a good mirror surface effect; in addition, the aldehyde ketone polycondensation resin has the advantages of quick drying, glossiness, adhesive force, leveling property, pigment wetting property, weather resistance and the like, and the leveling property of the powder coating can also be improved. The filler can enhance the brightness of the imitation electroplating coating and can also increase the mechanical strength of the imitation electroplating coating. The phenolic aldehyde modified epoxy resin can improve the overall corrosion resistance without influencing the leveling property.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Example 1
The electroplating-simulated powder coating comprises the following components in parts by weight: 30 parts of epoxy resin (epoxy resin CYD-017), 10 parts of phenolic aldehyde modified epoxy resin (20 mass percent of thermosetting phenolic resin and 80 mass percent of brominated diphenol propane epoxy resin), 30 parts of unsaturated polyester resin (unsaturated polyester resin 195), 1-part of filler (barite), 0.5 part of aldehyde-ketone polycondensation resin (aldehyde-ketone resin 120), 6-part of aluminum paste (60 mass percent of aluminum powder, and the particle size of the aluminum powder is 20-50 mu m), 0.3 part of dispersant (dispersant W-3060) and 0.2 part of leveling agent (hydrogenated castor oil); 1 part of a curing agent (ethylenediamine).
A method for preparing the imitation electroplating powder coating comprises the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to the mixture ratio of parts by weight, kneading and dispersing at the mixing temperature of 70 ℃, the rotating speed of 60r/min and the dispersing time of 10min, adding the mixture into a double-screw extruder, extruding and tabletting at the temperature of 90 ℃, and crushing the sheet to obtain powder A with the particle size of less than or equal to 100 mu m for later use;
adding phenolic aldehyde modified epoxy resin, unsaturated polyester resin, aldehyde ketone polycondensation resin, a curing agent, a dispersing agent, a flatting agent and aluminum paste into a bonding machine according to the weight part ratio for bonding, wherein the rotating speed is 500r/min, the bonding time is 10min, adding the mixture into an airflow curing machine, curing into a sheet under the conditions that the temperature is 140 ℃ and the air pressure is 1.6Mpa, and crushing the sheet to obtain powder B with the particle size of less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer at the rotating speed of 700r/min for 45min, and stirring and dispersing to obtain the imitation electroplating powder coating.
Example 2
The electroplating-simulated powder coating comprises the following components in parts by weight: 40 parts of epoxy resin (epoxy resin CYD-019), 15 parts of phenolic aldehyde modified epoxy resin (30 mass percent of thermosetting phenolic resin and 70 mass percent of brominated diphenol propane epoxy resin), 40 parts of unsaturated polyester resin (unsaturated polyester resin 118 and unsaturated polyester resin 193), 5 parts of filler (barite), 1.2 parts of aldehyde ketone polycondensation resin aldehyde ketone resin a81), 12 parts of aluminum paste (the mass percent of aluminum powder is 80 percent, the particle size of the aluminum powder is 20-50 mu m), 0.5 part of dispersant (dispersant W-3050) and 0.4 part of flatting agent (polyvinyl butyral); 5 parts of a curing agent (diethylenetriamine).
A method for preparing the imitation electroplating powder coating comprises the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to the mixture ratio of parts by weight, kneading and dispersing at the mixing temperature of 80 ℃, the rotating speed of 50r/min and the dispersing time of 5min, adding the mixture into a double-screw extruder, extruding and tabletting at the temperature of 100 ℃, and crushing the sheet to obtain powder A with the particle size of less than or equal to 100 mu m for later use;
adding phenolic aldehyde modified epoxy resin, unsaturated polyester resin, aldehyde ketone polycondensation resin, a curing agent, a dispersing agent, a flatting agent and aluminum paste into a bonding machine according to the weight part ratio for bonding, wherein the rotating speed is 600r/min, the bonding time is 5min, adding the mixture into a pneumatic curing machine, curing into a sheet under the conditions that the temperature is 200 ℃ and the air pressure is 1.4Mpa, and crushing the sheet to obtain powder B with the particle size of less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B according to the weight part ratio into a high-speed mixer, wherein the rotating speed is 900r/min, the mixing time is 30min, and stirring and dispersing to obtain the imitation electroplating powder coating.
Example 3
The electroplating-simulated powder coating comprises the following components in parts by weight: 35 parts of epoxy resin (epoxy resin CYD-020N), 12 parts of phenolic aldehyde modified epoxy resin (25% by mass of thermosetting phenolic resin and 75% by mass of brominated diphenol propane epoxy resin), 33 parts of unsaturated polyester resin (unsaturated polyester resin 193), 2 parts of filler (barite), 0.8 part of aldehyde-ketone polycondensation resin (aldehyde-ketone resin a81), 8 parts of aluminum paste (70% by mass of aluminum powder and 20-50 μm of aluminum powder particle size), 0.4 part of dispersing agent (dispersing agent W-3035) and 0.3 part of flatting agent (polyvinyl butyral); 2 parts of a curing agent (triethylene tetramine).
A method for preparing the imitation electroplating powder coating comprises the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to a weight part ratio, kneading and dispersing at a mixing temperature of 75 ℃, a rotating speed of 55r/min and a dispersing time of 8min, adding the mixture into a double-screw extruder, extruding and tabletting at a temperature of 95 ℃, and crushing the sheet to a particle size of less than or equal to 100 mu m to obtain powder A for later use;
adding phenolic aldehyde modified epoxy resin, unsaturated polyester resin, aldehyde ketone polycondensation resin, a curing agent, a dispersing agent, a flatting agent and aluminum paste into a bonding machine according to the weight part ratio for bonding, wherein the rotating speed is 550r/min, the bonding time is 8min, adding the mixture into a pneumatic curing machine, curing into a sheet under the conditions that the temperature is 160 ℃ and the air pressure is 1.5Mpa, and crushing the sheet to obtain powder B with the particle size of less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer at the rotating speed of 800r/min for 40min, and stirring and dispersing to obtain the imitation electroplating powder coating.
Example 4
The electroplating-simulated powder coating comprises the following components in parts by weight: 38 parts of epoxy resin (epoxy resin CYD-014), 15 parts of phenolic aldehyde modified epoxy resin (25% by mass of thermosetting phenolic resin and 75% by mass of brominated diphenol propane epoxy resin), 35 parts of unsaturated polyester resin (unsaturated polyester resin 193), 4 parts of filler (barite), 1.0 part of aldehyde ketone polycondensation resin (aldehyde ketone resin 120), 10 parts of aluminum paste (75% by mass of aluminum powder and 20-50 μm of particle size of the aluminum powder), 0.4 part of dispersant (dispersant W-3035) and 0.3 part of leveling agent (hydrogenated castor oil); 4 parts of a curing agent (diethylenetriamine).
A method for preparing the imitation electroplating powder coating comprises the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to a weight part ratio, kneading and dispersing at a mixing temperature of 75 ℃, a rotating speed of 55r/min and a dispersing time of 8min, adding the mixture into a double-screw extruder, extruding and tabletting at a temperature of 95 ℃, and crushing the sheet to a particle size of less than or equal to 100 mu m to obtain powder A for later use;
adding the phenolic aldehyde modified epoxy resin, the unsaturated polyester resin, the aldehyde ketone polycondensation resin, the curing agent, the dispersing agent, the flatting agent and the aluminum paste into a bonding machine according to the weight part ratio for bonding, wherein the rotating speed is 550r/min, the bonding time is 8min, adding the mixture into a pneumatic curing machine, curing into a sheet under the conditions that the temperature is 180 ℃ and the air pressure is 1.5Mpa, and crushing the sheet to obtain powder B with the particle size of less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer at the rotating speed of 800r/min for 40min, and stirring and dispersing to obtain the imitation electroplating powder coating.
Example 5
The electroplating-simulated powder coating comprises the following components in parts by weight: 36 parts of epoxy resin (epoxy resin CYD-014), 14 parts of phenolic aldehyde modified epoxy resin (25% by mass of thermosetting phenolic resin and 75% by mass of brominated diphenol propane epoxy resin), 34 parts of unsaturated polyester resin (unsaturated polyester resin 195), 3 parts of filler (barite), 0.9 part of aldehyde ketone polycondensation resin (aldehyde ketone resin 120), 9 parts of aluminum paste (70% by mass of aluminum powder and 20-50 μm of particle size of the aluminum powder), 0.4 part of dispersant (dispersant W-3060) and 0.3 part of leveling agent (hydrogenated castor oil); 3 parts of a curing agent (triethylene tetramine).
A method for preparing the imitation electroplating powder coating comprises the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to a weight part ratio, kneading and dispersing at a mixing temperature of 75 ℃, a rotating speed of 55r/min and a dispersing time of 8min, adding the mixture into a double-screw extruder, extruding and tabletting at a temperature of 95 ℃, and crushing the sheet to a particle size of less than or equal to 100 mu m to obtain powder A for later use;
adding the phenolic aldehyde modified epoxy resin, the unsaturated polyester resin, the aldehyde ketone polycondensation resin, the curing agent, the dispersing agent, the flatting agent and the aluminum paste into a bonding machine according to the weight part ratio for bonding, wherein the rotating speed is 550r/min, the bonding time is 8min, adding the mixture into a pneumatic curing machine, curing into a sheet under the conditions that the temperature is 180 ℃ and the air pressure is 1.5Mpa, and crushing the sheet to obtain powder B with the particle size of less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer at the rotating speed of 800r/min for 40min, and stirring and dispersing to obtain the imitation electroplating powder coating.
Comparative example 1
The electroplating-simulated powder coating comprises the following components in parts by weight: 36 parts of epoxy resin (epoxy resin CYD-014), 34 parts of unsaturated polyester resin (unsaturated polyester resin 195), 3 parts of filler (barite), 0.9 part of aldehyde-ketone polycondensation resin (aldehyde-ketone resin 120), 9 parts of aluminum paste (the mass fraction of aluminum powder is 70%, the particle size of the aluminum powder is 20-50 μm), 0.4 part of dispersant (dispersant W-3060) and 0.3 part of leveling agent (hydrogenated castor oil); 3 parts of a curing agent (triethylene tetramine).
A method for preparing the imitation electroplating powder coating comprises the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to a weight part ratio, kneading and dispersing at a mixing temperature of 75 ℃, a rotating speed of 55r/min and a dispersing time of 8min, adding the mixture into a double-screw extruder, extruding and tabletting at a temperature of 95 ℃, and crushing the sheet to a particle size of less than or equal to 100 mu m to obtain powder A for later use;
step two, adding unsaturated polyester resin, aldehyde ketone polycondensation resin, a curing agent, a dispersing agent, a flatting agent and aluminum paste into a bonding machine according to the weight part ratio for bonding, wherein the rotating speed is 550r/min, the bonding time is 8min, then adding the mixture into a pneumatic curing machine, curing into sheets under the conditions that the temperature is 180 ℃ and the air pressure is 1.5Mpa, and then crushing the sheets to obtain powder B with the particle size of less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer at the rotating speed of 800r/min for 40min, and stirring and dispersing to obtain the imitation electroplating powder coating.
Comparative example 2
The electroplating-simulated powder coating comprises the following components in parts by weight: 36 parts of epoxy resin (epoxy resin CYD-014), 14 parts of phenolic aldehyde modified epoxy resin (thermosetting phenolic resin with the mass fraction of 25% and brominated diphenol propane epoxy resin with the mass fraction of 75%), 34 parts of unsaturated polyester resin (unsaturated polyester resin 195), 3 parts of filler (barite), 9 parts of aluminum paste (aluminum powder with the mass fraction of 70% and the particle size of 20-50 μm), 0.4 part of dispersant (dispersant W-3060) and 0.3 part of leveling agent (hydrogenated castor oil); 3 parts of a curing agent (triethylene tetramine).
A method for preparing the imitation electroplating powder coating comprises the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to a weight part ratio, kneading and dispersing at a mixing temperature of 75 ℃, a rotating speed of 55r/min and a dispersing time of 8min, adding the mixture into a double-screw extruder, extruding and tabletting at a temperature of 95 ℃, and crushing the sheet to a particle size of less than or equal to 100 mu m to obtain powder A for later use;
adding the phenolic aldehyde modified epoxy resin, the unsaturated polyester resin, the curing agent, the dispersing agent, the flatting agent and the aluminum paste into a bonding machine according to the weight part ratio for bonding, wherein the rotating speed is 550r/min, the bonding time is 8min, then adding the mixture into a pneumatic curing machine, curing into sheets under the conditions that the temperature is 180 ℃ and the air pressure is 1.5Mpa, and then crushing the sheets to obtain powder B with the particle size of less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer at the rotating speed of 800r/min for 40min, and stirring and dispersing to obtain the imitation electroplating powder coating.
Comparative example 1 no phenolic-modified epoxy resin was added relative to example 5. Comparative example 2 no aldehyde ketone polycondensation resin was added relative to example 5.
The following tests were carried out after coating the plating-simulated powder coating films prepared in examples 1 to 5 and comparative examples 1 to 2, and the test results are shown in table 1:
and (3) coating: the base material (50mm × 1200mm × 0.5mm) is cleaned and then placed in a powder spraying cabinet, and is sprayed by a high-voltage electrostatic generator, and the film thickness of the coating plate is 250-. And keeping the sprayed sample vertical, and curing in a constant-temperature drying oven at 100 ℃ for 15 min. And then placing the sample plate in a constant temperature and humidity box with the temperature of 23 +/-2 ℃ and the relative humidity of 50 +/-5% for 24 hours to finish plate making.
Gloss: the gloss of the coating is measured on the coating plate by a specular gloss meter (test angle 60 ℃).
And (3) acid resistance measurement: 2/3 of the coating plate is soaked in a sulfuric acid solution with the temperature of 25 ℃ and the mass fraction of 4.5 percent, taken out every 24 hours, the coating plate is cleaned by water, the surface is wiped by absorbent paper, and the condition of discoloration, light loss, bubbles, spots, falling off and the like on the coating surface is checked. The surface properties of the glass fiber are not changed for 20 days or more, and the glass fiber is qualified without phenomena of powder removal, dissolution, light loss, color change, air bubble generation and the like.
Alkali resistance measurement: 2/3 of the coating plate is soaked in sodium hydroxide solution with the temperature of 25 ℃ and the mass fraction of 4.5 percent, taken out every 24 hours, the coating plate is cleaned by water, the surface is wiped by absorbent paper, and the conditions of discoloration, light loss, bubbles, spots, falling off and the like on the coating surface are checked. The surface properties of the glass fiber are not changed for 20 days or more, and the glass fiber is qualified without phenomena of powder removal, dissolution, light loss, color change, air bubble generation and the like.
And (3) testing the salt water resistance: 2/3 of the coating plate is soaked in NaCl aqueous solution with the temperature of 25 ℃ and the mass fraction of 3 percent, taken out every 24 hours, the coating plate is cleaned by water and then the surface is wiped by absorbent paper, and the conditions of peeling, wrinkling, bubbling, rusting, dulling and the like on the surface of the coating are checked. The surface properties of the glass fiber are not changed for 20 days or more, and the glass fiber is qualified without phenomena of powder removal, dissolution, light loss, color change, air bubble generation and the like.
And (3) adhesive force determination: adopting a hundred-grid knife QFH test, pressing a knife head to scratch the coating plate, scraping the surface coating (to a substrate) by the knife head, and then performing 90-degree angle cross cutting to form a cross-shaped cross square grid. The scribing is smooth, and the grid has no coating stripping phenomenon of 0 level; the cross part of the grid is slightly peeled off, and less than 5 percent of the area of the grid is influenced to be 1 level; the scribing edge and the grid cross part are both stripped, and the scribing area which is more than 5 percent and less than 15 percent is influenced to be 2-level; the scribing edge is partially or wholly peeled off, and the scribing area which is more than 15 percent and less than 35 percent is influenced to be 3 grades; the scribing edge is partially or wholly peeled off, some grids are partially or completely peeled off, and the area of the scribing grids which is more than 35 percent and less than 65 percent is influenced to be 4 grades; cannot be classified by rank 4 as rank 5.
Table 1
As can be seen from the data in Table 1, comparative example 1 has no phenolic-modified epoxy resin added, compared with example 5, so that the formed coating has poor acid and alkali corrosion resistance. Comparative example 2 compared to example 5, no aldehyde ketone polycondensation resin was added, resulting in a coating having a lower gloss and no mirror effect.
In conclusion, the epoxy resin and the unsaturated polyester resin are used as base materials, the phenolic aldehyde modified epoxy resin, the filler, the aldehyde ketone polycondensation resin and the aluminum paste are added into the base materials according to a certain proportion, the aldehyde ketone polycondensation resin has an effect of enabling the aluminum paste to be arranged in an oriented mode, the arrangement regularity of the aluminum paste can be improved, and the imitation electroplating coating obtained through spraying has good flatness and a good mirror surface effect. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The electroplating-simulated powder coating is characterized by comprising the following components in parts by weight: 30-40 parts of epoxy resin, 10-15 parts of phenolic aldehyde modified epoxy resin, 30-40 parts of unsaturated polyester resin, 1-5 parts of filler, 0.5-1.2 parts of aldehyde ketone polycondensation resin, 6-12 parts of aluminum paste, 0.3-0.5 part of dispersing agent and 0.2-0.4 part of flatting agent; 1-5 parts of a curing agent.
2. The imitation electroplating powder coating of claim 1, wherein: the imitation electroplating powder coating comprises the following components in parts by weight: 35-38 parts of epoxy resin, 12-15 parts of phenolic aldehyde modified epoxy resin, 33-35 parts of unsaturated polyester resin, 2-4 parts of filler, 0.8-1.0 part of aldehyde ketone polycondensation resin, 8-10 parts of aluminum paste, 0.3-0.5 part of dispersing agent and 0.2-0.4 part of flatting agent; 1-5 parts of a curing agent.
3. The imitation electroplating powder coating of claim 1 or 2, wherein: the phenolic aldehyde modified epoxy resin comprises 20-30% by mass of thermosetting phenolic resin and 70-80% by mass of brominated diphenol propane epoxy resin.
4. The imitation electroplating powder coating of claim 3, wherein: the phenolic aldehyde modified epoxy resin comprises 25-28% of thermosetting phenolic resin and 72-75% of brominated diphenol propane epoxy resin.
5. The imitation electroplating powder coating of claim 1 or 2, wherein: the epoxy resin is at least one of epoxy resin CYD-017, epoxy resin CYD-019, epoxy resin CYD-020N and epoxy resin CYD-014; the unsaturated polyester resin is at least one of unsaturated polyester resin 195, unsaturated polyester resin 118 and unsaturated polyester resin 193;
the aldehyde ketone polycondensation resin is at least one of aldehyde ketone resin 120 and aldehyde ketone resin a 81;
the dispersant is at least one of dispersant W-3060, dispersant W-3050 and dispersant W-3035;
the leveling agent is at least one of hydrogenated castor oil and polyvinyl butyral;
the filler is barite;
the curing agent is at least one of ethylenediamine, diethylenetriamine and triethylene tetramine.
6. The imitation electroplating powder coating of claim 1 or 2, wherein: the aluminum paste comprises 60-80% of aluminum powder by mass and 20-50 μm of aluminum powder in particle size.
7. A method for preparing the imitation electroplating powder coating as claimed in any one of claims 1 to 6, comprising the following steps:
step one, adding epoxy resin and a filler into an internal mixer according to a weight part ratio for kneading and dispersing, adding the mixture into a double-screw extruder, extruding and tabletting at a temperature of 90-100 ℃, and crushing the sheet to obtain powder A with a particle size of less than or equal to 100 microns for later use;
adding phenolic aldehyde modified epoxy resin, unsaturated polyester resin, aldehyde ketone polycondensation resin, a curing agent, a dispersing agent, a flatting agent and aluminum paste into a bonding machine according to the weight part ratio for bonding, adding the mixture into an airflow curing machine, curing into a sheet under the conditions that the temperature is 140-200 ℃ and the air pressure is 1.4-1.6 Mpa, and crushing the sheet to obtain powder B with the particle size being less than or equal to 100 mu m for later use;
and step three, adding the powder A and the powder B in parts by weight into a high-speed mixer, and stirring and dispersing to obtain the imitation electroplating powder coating.
8. The method of claim 7, wherein the step of preparing the imitation electroplating powder coating comprises: in the first step, the mixing temperature of the internal mixer is 70-80 ℃, the rotating speed is 50-60 r/min, and the dispersion time is 5-10 min.
9. The method of claim 7, wherein the step of preparing the imitation electroplating powder coating comprises: and in the second step, the rotating speed of the bonding machine is 500-600 r/min, and the bonding time is 5-10 min.
10. The method of claim 7, wherein the step of preparing the imitation electroplating powder coating comprises: the rotating speed of the high-speed mixer in the third step is 700-900 r/min, and the mixing time is 30-45 min.
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Application publication date: 20210716 |