CN113308176B - Polyester resin powder coating - Google Patents
Polyester resin powder coating Download PDFInfo
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- CN113308176B CN113308176B CN202110608488.6A CN202110608488A CN113308176B CN 113308176 B CN113308176 B CN 113308176B CN 202110608488 A CN202110608488 A CN 202110608488A CN 113308176 B CN113308176 B CN 113308176B
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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
- 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
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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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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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
- C08K3/18—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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention belongs to the technical field of polyester resin powder coatings, and particularly relates to a polyester resin powder coating which comprises the following components in parts by weight: 40-45% of polyester resin, 15-20% of filler, 8-10% of modifier, 2-3% of benzoin, 1-1.2% of coupling agent, 0.8-1% of flatting agent, 0.5-0.7% of curing agent and the balance epoxy resin; the modifier is a mixture of nano titanium dioxide and nano silicon dioxide, and the ratio of the nano titanium dioxide to the nano silicon dioxide is 1: 1; the filler is a metal wire, and the length of the metal wire is 15-25 um; the diameter of the metal wire is 2-3 um; the coating disclosed by the invention is simple in preparation method, low in production cost, excellent in performance and good in use and popularization value.
Description
Technical Field
The invention belongs to the technical field of polyester resin powder coatings, and particularly relates to a polyester resin powder coating.
Background
The powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler, auxiliary agent and the like. Unlike common solvent paint and water paint, the dispersing medium is not solvent and water but air, and has the features of no solvent pollution, 100% filming and low power consumption. The powder coating has two main categories of thermoplasticity and thermosetting property, the appearance (luster and leveling property) of a coating film of the thermoplasticity powder coating is poor, and the adhesive force between the coating film and 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 polyester powder coating on the market at present has poor wear resistance and impact resistance, and is easy to cause damage and cracking of the coating after being impacted by external force in daily use, so that the normal use and the aesthetic degree of the coating are influenced, and therefore, improvement is needed.
Some technical solutions also exist in the prior art, for example, chinese patent with application number CN201810975197.9 discloses a high-toughness super-weather-resistant outdoor powder coating, which is prepared by adding a large amount of an auxiliary agent synthesized from graphene and hydroxyl-terminated hyperbranched polyester to improve the toughness of the powder coating, and the best positive and negative impact can reach 55/50. However, due to the characteristic that graphene is easy to agglomerate, graphene in the powder coating is not easy to disperse, so that the graphene is unevenly distributed in a coating coated on the surface of a workpiece, the improvement of the performance of the coating by the graphene is influenced, and the impact resistance of the coating is not obviously improved.
Disclosure of Invention
In order to make up for the defects of the prior art, improve the wear resistance and impact resistance of the polyester resin powder coating and prolong the service life of the coating, the invention provides the polyester resin powder coating.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a polyester resin powder coating which comprises the following components in parts by weight:
40-45% of polyester resin, 15-20% of filler, 8-10% of modifier, 2-3% of benzoin, 1-1.2% of coupling agent, 0.8-1% of flatting agent, 0.5-0.7% of curing agent and the balance epoxy resin; the modifier is a mixture of nano titanium dioxide and nano silicon dioxide, and the ratio of the nano titanium dioxide to the nano silicon dioxide is 1: 1; the filler is a metal wire, and the length of the metal wire is 15-25 um; the diameter of the metal wire is 2-3 um;
the preparation method of the powder coating comprises the following steps:
s1: selecting a metal material, preparing continuous metal fibers by adopting a cluster drawing method, and then cutting the metal fibers to obtain chopped metal wires;
s2: uniformly mixing polyester resin, epoxy resin, a modifier, benzoin and a flatting agent according to a given proportion, putting the mixture into a stirring kettle, and fully stirring the raw materials in the stirring kettle;
s3: on the basis of the step S2, adding a coupling agent and a curing agent into a stirring kettle, and fully stirring and mixing to obtain a premix;
s4: on the basis of the step S3, the premix is put into a double-screw extruder, and the extruded material is tabletted and cooled to obtain a flaky material;
s5: putting the flaky material into a crusher, crushing to obtain granules, and fully mixing the chopped metal wires and the crushed granules to obtain a finished powder coating;
when the coating is in use, the powder-state coating is sprayed and attached to the surface of a workpiece in an electrostatic spraying mode, then the workpiece is heated in an infrared heating mode, so that the powder-state coating is melted, the coating forms a complete whole, the surface of the workpiece is protected, meanwhile, in the use process, the hardness of the sprayed and cured coating is improved through the added nano titanium dioxide and nano silicon dioxide acting as modifiers, the possibility that the coating is scratched due to external acting force in the use process is reduced, the wear resistance of the coating is improved, meanwhile, the nano silicon dioxide and the nano titanium dioxide mixed into the coating can absorb and block ultraviolet rays in sunlight to a certain extent, the damage to resin in the powder coating under illumination is reduced, and the service life of the powder coating is prolonged, simultaneously, in the use, through the wire that evenly sneaks into in powder coating, can be after the powder coating spraying solidifies the surface of work piece, crisscross each other in the coating on workpiece surface, form the structure of similar latticed, structure through the net type can effectual promotion coating structural strength, thereby guarantee in the use, when the coating receives less external force impact, the coating can keep relatively stable, avoid the coating damage, drop, influence the performance of coating normal function, simultaneously, avoid the coating damage to lead to the coating to the inefficacy of work piece guard action, make work piece and external environment direct contact, arouse the work piece to appear corroding under the environmental action, influence the life of work piece.
Preferably, in the process of adding raw materials into the stirring kettle and stirring, heating the stirring kettle at the temperature of 40-55 ℃; ultrasonic waves are used for auxiliary stirring in the stirring process; in the stirring process, when the modifier, the benzoin and the flatting agent are added, the stirring kettle is stirred for 30-35min at the speed of 300-350 r/min; in the stirring process, when the coupling agent and the curing agent are put into the stirring kettle, the stirring kettle is stirred for 5-8min at the speed of 700-750 r/min;
the during operation, through use the ultrasonic wave to carry out the auxiliary mixing in the mixing process to the raw materials, can improve the misce bene degree between the different raw materials in reation kettle to a certain extent, prevent to have the inhomogeneous part of raw materials mixture among the finished product powder coating, the structural strength who leads to mixing the inhomogeneous region in the coating is lower, make the performance of coating in the region that corresponds lower, appear damaging under the exogenic action easily, influence the protecting effect and the guard period to the work piece, and simultaneously, in the use, through using different stirring speed and churning time, the even degree that each component raw materials mixes in powder coating of promotion that can further, promote the powder coating's that the preparation obtained performance.
Preferably, the metal wire is made of one-way memory metal, and the metal wire is added into the powder coating after being curled and agglomerated; when the powder coating is heated and cured, the metal wire is stretched again from a curling state and is restored to the original state; the average diameter of the metal wires after being curled and agglomerated is 5-8 um; the average diameter of the particles in the powder coating is 35-35 um;
when the coating is in use, the metal wires are curled into the clusters and mixed into the powder coating, so that the powder coating and the metal wires added into the coating have the same probability of being sprayed onto the surface of a workpiece when the powder coating is sprayed, the metal wires in a linear shape are prevented from being influenced by the shape of the metal wires in the spraying process, the metal wires are blocked in the electrostatic spray gun, the normal spraying work of the coating is influenced, meanwhile, the phenomenon that the metal wires are insufficient in driving force when being sprayed out of the electrostatic spray gun due to the shape of the metal wires is avoided, the metal wires cannot synchronously contact with the particle materials in the powder coating and stay on the surface of the workpiece, the distribution state of the metal wires in the solidified coating is influenced, the number of the metal wires in the solidified coating is small, the metal wires are unevenly distributed, and the structural strength of the coating is influenced, the performance of the coating is reduced, meanwhile, in the using process, the powder coating is bonded and solidified on the surface of the workpiece in a heating and post-solidifying mode, in addition, because the metal wire is made of one-way memory metal, the metal wire is synchronously heated and begins to stretch in the heating and solidifying process of the powder coating until the metal wire is recovered to the initial linear state from the state of curling and agglomerating, so that the metal wires in the molten coating are mutually intertwined, the complexity of the net structure of the metal wires in the coating is improved, the structural strength of the coating is further improved, the impact resistance of the coating is improved, meanwhile, through the shape transformation of the metal wire, the metal wire can be uniformly and easily sprayed on the surface of the workpiece in the powder coating spraying process, and the metal wire added into the coating is prevented from being separated from the coating in the spraying process, affecting the spraying effect of the powder coating.
Preferably, after the metal wire is stretched again in a heating state, the metal wire takes a wavy shape;
during operation, after the metal wire is restored to the initial form, the metal wire is in a wave shape, the binding force between the metal wire and the coating can be improved, the coating is prevented from sliding along the length direction of the metal wire when being impacted by external force, cracks appear on the coating, the two sides of the cracks and the gaps of the coatings slide, the cracks in the coating are enlarged, the damage degree of the coating is enlarged, the normal use of the coating is influenced, and the protection effect of the coating on a workpiece is influenced.
Preferably, the metal wire is subjected to surface treatment and then is curled into a ball; the surface treatment of the metal wire is gas-phase low-temperature plasma treatment, and the treatment time is 10-12 min;
during operation, before the metal wire is added into the powder coating, the metal wire is subjected to surface treatment, after the metal wire is treated by using a gas-phase low-temperature plasma treatment mode, the surface of the metal wire can be clean and tidy, pollutants are prevented from existing on the surface of the metal wire, the curing effect of the coating is influenced after the metal wire is added, the surface finish degree of the coating is reduced, and the aesthetic degree of the coating is influenced, meanwhile, after the metal wire is subjected to plasma treatment, the surface of the metal wire is subjected to an etching effect, the surface roughness of the metal wire is improved, a plurality of micro pits are formed on the surface of the metal wire, the specific surface of the metal wire is increased, the surface wettability is improved, the bonding force between the metal wire and the coating is more compact, the bonding force between the metal wire and the coating is improved, the structural strength of the coating is improved, and the performance of the coating is improved, meanwhile, in the using process, the surface of the metal wire after plasma treatment can generate a crosslinking reaction with resin in the coating, and the bonding force between the metal wire and the coating is further improved.
Preferably, after the metal wire is curled and agglomerated, the metal wire is subjected to promotion treatment, and then the metal wire is added into the powder coating; in the process of promoting the treatment of the metal wire, putting the metal wire into a container containing a coupling agent; after the metal wire is put into the container, heating the container at the temperature of 45-55 ℃; in the process of promoting treatment, the container is vacuumized, and the container is kept in a negative pressure state; after the metal wire is treated, adding the coupling agent left in the container as a raw material into the raw material according to a preset proportion to prepare a powder coating;
when the coating is in work, after the metal wire is subjected to plasma treatment, the metal wire is put into a container containing a coupling agent for heating, so that the bonding between an active group in a coupling agent molecule and the metal surface can be effectively promoted, a layer of coupling agent is attached to the surface of the metal wire, the bonding between the metal wire and resin in the coating is promoted, the bonding force between the metal wire and the coating is improved, the structural strength of the coating and the performance of the coating are improved, meanwhile, the metal wire and the coupling agent are combined and then added into the powder coating, so that the situation that tiny gaps exist between the metal wire and the coating in the coating, the resin in the coating cannot be in full contact with the metal wire, the effect of the coupling agent generated between the metal wire and the resin is reduced, the bonding force between the metal wire and the coating is low, and the performance of the coating is influenced is prevented.
The invention has the following beneficial effects:
1. according to the polyester resin powder coating, the metal wire, the coupling agent and the modifier are added into the powder coating, the abrasion resistance of a coating on the surface is improved to a certain extent under the action of the modifier, the possibility of scratches when the coating is subjected to an external force is reduced, meanwhile, the structural strength of the coating is improved, the possibility of cracking or breakage of the coating under the impact of the external force is reduced, and the impact performance of the coating is improved.
2. According to the polyester resin powder coating, the metal wire is prepared by using the one-way memory metal, and meanwhile, when the metal wire is added into the coating, the metal wire is curled into a mass, so that the possibility that the metal wire is sprayed to the surface of a workpiece can be effectively improved, the influence of the shape of the metal wire per se is avoided, the possibility that the metal wire reaches the surface of the workpiece after being sprayed out from a spray gun is reduced, the spray gun is prevented from being blocked by the uncrimped metal wire, meanwhile, in the using process, the agglomeration of the metal wire in powder and the interpenetration of the metal wire after the metal wire is stretched in the coating are prevented by memorizing the characteristic that the metal wire is heated and deformed, the stability of a grid structure formed by the metal wire in the coating is improved, the structural strength of the coating is improved, and the impact resistance of the coating is improved.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of the steps for preparing the powder coating of the present invention;
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in figure 1, the polyester resin powder coating comprises the following components in parts by weight:
40-45% of polyester resin, 15-20% of filler, 8-10% of modifier, 2-3% of benzoin, 1-1.2% of coupling agent, 0.8-1% of flatting agent, 0.5-0.7% of curing agent and the balance epoxy resin; the modifier is a mixture of nano titanium dioxide and nano silicon dioxide, and the ratio of the nano titanium dioxide to the nano silicon dioxide is 1: 1; the filler is a metal wire, and the length of the metal wire is 15-25 um; the diameter of the metal wire is 2-3 um;
the preparation method of the powder coating comprises the following steps:
s1: selecting a metal material, preparing continuous metal fibers by adopting a cluster drawing method, and then cutting the metal fibers to obtain chopped metal wires;
s2: uniformly mixing polyester resin, epoxy resin, a modifier, benzoin and a flatting agent according to a given proportion, putting the mixture into a stirring kettle, and fully stirring the raw materials in the stirring kettle;
s3: on the basis of the step S2, adding a coupling agent and a curing agent into a stirring kettle, and fully stirring and mixing to obtain a premix;
s4: on the basis of the step S3, the premix is put into a double-screw extruder, and the extruded material is tabletted and cooled to obtain a flaky material;
s5: putting the flaky material into a crusher, crushing to obtain granules, and fully mixing the chopped metal wires and the crushed granules to obtain a finished powder coating;
when the coating is in use, the powder-state coating is sprayed and attached to the surface of a workpiece in an electrostatic spraying mode, then the workpiece is heated in an infrared heating mode, so that the powder-state coating is melted, the coating forms a complete whole, the surface of the workpiece is protected, meanwhile, in the use process, the hardness of the sprayed and cured coating is improved through the added nano titanium dioxide and nano silicon dioxide acting as modifiers, the possibility that the coating is scratched due to external acting force in the use process is reduced, the wear resistance of the coating is improved, meanwhile, the nano silicon dioxide and the nano titanium dioxide mixed into the coating can absorb and block ultraviolet rays in sunlight to a certain extent, the damage to resin in the powder coating under illumination is reduced, and the service life of the powder coating is prolonged, simultaneously, in the use, through the wire that evenly sneaks into in powder coating, can be after the powder coating spraying solidifies the surface of work piece, crisscross each other in the coating on workpiece surface, form the structure of similar latticed, structure through the net type can effectual promotion coating structural strength, thereby guarantee in the use, when the coating receives less external force impact, the coating can keep relatively stable, avoid the coating damage, drop, influence the performance of coating normal function, simultaneously, avoid the coating damage to lead to the coating to the inefficacy of work piece guard action, make work piece and external environment direct contact, arouse the work piece to appear corroding under the environmental action, influence the life of work piece.
As an embodiment of the invention, in the process of adding raw materials into the stirring kettle and stirring, the stirring kettle is heated, and the heating temperature is 40-55 ℃; ultrasonic waves are used for auxiliary stirring in the stirring process; in the stirring process, when the modifier, the benzoin and the flatting agent are added, the stirring kettle is stirred for 30-35min at the speed of 300-350 r/min; in the stirring process, when the coupling agent and the curing agent are put into the stirring kettle, the stirring kettle is stirred for 5-8min at the speed of 700-750 r/min;
the during operation, through use the ultrasonic wave to carry out the auxiliary mixing in the mixing process to the raw materials, can improve the misce bene degree between the different raw materials in reation kettle to a certain extent, prevent to have the inhomogeneous part of raw materials mixture among the finished product powder coating, the structural strength who leads to mixing the inhomogeneous region in the coating is lower, make the performance of coating in the region that corresponds lower, appear damaging under the exogenic action easily, influence the protecting effect and the guard period to the work piece, and simultaneously, in the use, through using different stirring speed and churning time, the even degree that each component raw materials mixes in powder coating of promotion that can further, promote the powder coating's that the preparation obtained performance.
As an embodiment of the present invention, the metal wire is made of a one-way memory metal, and the metal wire is added to the powder coating after being curled into a mass; when the powder coating is heated and cured, the metal wire is stretched again from a curling state and is restored to the original state; the average diameter of the metal wires after being curled and agglomerated is 5-8 um; the average diameter of the particles in the powder coating is 35-35 um;
when the coating is in use, the metal wires are curled into the clusters and mixed into the powder coating, so that the powder coating and the metal wires added into the coating have the same probability of being sprayed onto the surface of a workpiece when the powder coating is sprayed, the metal wires in a linear shape are prevented from being influenced by the shape of the metal wires in the spraying process, the metal wires are blocked in the electrostatic spray gun, the normal spraying work of the coating is influenced, meanwhile, the phenomenon that the metal wires are insufficient in driving force when being sprayed out of the electrostatic spray gun due to the shape of the metal wires is avoided, the metal wires cannot synchronously contact with the particle materials in the powder coating and stay on the surface of the workpiece, the distribution state of the metal wires in the solidified coating is influenced, the number of the metal wires in the solidified coating is small, the metal wires are unevenly distributed, and the structural strength of the coating is influenced, the performance of the coating is reduced, meanwhile, in the using process, the powder coating is bonded and solidified on the surface of the workpiece in a heating and post-solidifying mode, in addition, because the metal wire is made of one-way memory metal, the metal wire is synchronously heated and begins to stretch in the heating and solidifying process of the powder coating until the metal wire is recovered to the initial linear state from the state of curling and agglomerating, so that the metal wires in the molten coating are mutually intertwined, the complexity of the net structure of the metal wires in the coating is improved, the structural strength of the coating is further improved, the impact resistance of the coating is improved, meanwhile, through the shape transformation of the metal wire, the metal wire can be uniformly and easily sprayed on the surface of the workpiece in the powder coating spraying process, and the metal wire added into the coating is prevented from being separated from the coating in the spraying process, affecting the spraying effect of the powder coating.
As an embodiment of the present invention, after the wire is re-stretched in a heated state, the wire takes a wavy shape;
during operation, after the metal wire is restored to the initial form, the metal wire is in a wave shape, the binding force between the metal wire and the coating can be improved, the coating is prevented from sliding along the length direction of the metal wire when being impacted by external force, cracks appear on the coating, the two sides of the cracks and the gaps of the coatings slide, the cracks in the coating are enlarged, the damage degree of the coating is enlarged, the normal use of the coating is influenced, and the protection effect of the coating on a workpiece is influenced.
As an embodiment of the present invention, the metal wire is subjected to surface treatment and then is curled into a mass; the surface treatment of the metal wire is gas-phase low-temperature plasma treatment, and the treatment time is 10-12 min;
during operation, before the metal wire is added into the powder coating, the metal wire is subjected to surface treatment, after the metal wire is treated by using a gas-phase low-temperature plasma treatment mode, the surface of the metal wire can be clean and tidy, pollutants are prevented from existing on the surface of the metal wire, the curing effect of the coating is influenced after the metal wire is added, the surface finish degree of the coating is reduced, and the aesthetic degree of the coating is influenced, meanwhile, after the metal wire is subjected to plasma treatment, the surface of the metal wire is subjected to an etching effect, the surface roughness of the metal wire is improved, a plurality of micro pits are formed on the surface of the metal wire, the specific surface of the metal wire is increased, the surface wettability is improved, the bonding force between the metal wire and the coating is more compact, the bonding force between the metal wire and the coating is improved, the structural strength of the coating is improved, and the performance of the coating is improved, meanwhile, in the using process, the surface of the metal wire after plasma treatment can generate a crosslinking reaction with resin in the coating, and the bonding force between the metal wire and the coating is further improved.
In one embodiment of the present invention, the metal wire is added to the powder coating after the metal wire is curled into a mass and subjected to an accelerating treatment; in the process of promoting the treatment of the metal wire, putting the metal wire into a container containing a coupling agent; after the metal wire is put into the container, heating the container at the temperature of 45-55 ℃; in the process of promoting treatment, the container is vacuumized, and the container is kept in a negative pressure state; after the metal wire is treated, adding the coupling agent left in the container as a raw material into the raw material according to a preset proportion to prepare a powder coating;
when the coating is in work, after the metal wire is subjected to plasma treatment, the metal wire is put into a container containing a coupling agent for heating, so that the bonding between an active group in a coupling agent molecule and the metal surface can be effectively promoted, a layer of coupling agent is attached to the surface of the metal wire, the bonding between the metal wire and resin in the coating is promoted, the bonding force between the metal wire and the coating is improved, the structural strength of the coating and the performance of the coating are improved, meanwhile, the metal wire and the coupling agent are combined and then added into the powder coating, so that the situation that tiny gaps exist between the metal wire and the coating in the coating, the resin in the coating cannot be in full contact with the metal wire, the effect of the coupling agent generated between the metal wire and the resin is reduced, the bonding force between the metal wire and the coating is low, and the performance of the coating is influenced is prevented.
The specific working process is as follows:
when the coating is in use, the powder-state coating is sprayed and attached to the surface of a workpiece in an electrostatic spraying mode, then the workpiece is heated in an infrared heating mode, so that the powder-state coating is melted, the coating forms a complete whole, meanwhile, in the use process, the hardness of the sprayed and cured coating is improved through the added nano titanium dioxide and nano silicon dioxide acting as a modifier, the possibility that scratches appear when the coating is subjected to external acting force in the use process is reduced, meanwhile, the nano silicon dioxide and the nano titanium dioxide mixed into the coating can absorb and block ultraviolet rays in sunlight to a certain degree, and meanwhile, in the use process, through metal wires uniformly mixed into the powder coating, the powder coating can be mutually staggered in the coating on the surface of the workpiece after being sprayed and cured to the surface of the workpiece, a grid-like structure is formed, and the structural strength of the coating can be effectively improved through the grid-type structure; the ultrasonic wave is used for auxiliary stirring in the mixing process of the raw materials, so that the mixing uniformity of different raw materials in the reaction kettle can be improved to a certain extent, and meanwhile, the mixing uniformity of the raw materials of all components in the powder coating is further improved by using different stirring speeds and stirring times in the using process; in the using process, the metal wire is curled into a mass and mixed into the powder coating, the powder coating and the metal wire added into the coating can have the same probability of being sprayed to the surface of a workpiece, meanwhile, the phenomenon that the metal wire is insufficient in driving force when being sprayed out of an electrostatic spray gun due to the shape of the metal wire is avoided, the metal wire cannot synchronously contact with particles in the powder coating and stays on the surface of the workpiece, meanwhile, the metal wire is made of one-way memory metal, so that the metal wire is synchronously heated and starts to stretch in the process of heating and curing the powder coating until the metal wire returns to the initial linear state from the state of being curled into the mass, and therefore, mutually-intertwined parts appear among the metal wires in the coating in a molten state, and meanwhile, the metal wire can be ensured to be uniform and can uniformly sprayed in the powder coating through the shape transformation of the metal wire, The paint is easily sprayed on the surface of a workpiece; after the metal wire is restored to the initial form, the metal wire is in a wave shape, and the binding force between the metal wire and the coating is improved; before the metal wire is added into the powder coating, the metal wire is subjected to surface treatment, the metal wire is treated in a gas-phase low-temperature plasma treatment mode, the surface of the metal wire can be clean and tidy, meanwhile, after the metal wire is subjected to plasma treatment, the surface of the metal wire is subjected to an etching effect, the surface roughness of the metal wire is improved, a plurality of fine pits are formed on the surface of the metal wire, the specific surface of the metal wire is increased, the wetting property of the surface is improved, and therefore the metal wire and the coating are combined more tightly; after the metal wire is subjected to plasma treatment, the metal wire is put into a container containing a coupling agent for heating, so that the bonding between active groups in the molecules of the coupling agent and the metal surface can be effectively promoted, a layer of coupling agent is attached to the surface of the metal wire, the bonding between the metal wire and resin in the coating is promoted, and the bonding force between the metal wire and the coating is improved.
In order to verify the properties of the powder coatings prepared according to the invention, experiments were carried out on the coatings prepared according to the invention.
Selecting a common polyester resin powder coating sold in the market with the same volume, a powder coating prepared by the invention (without metal wires), a powder coating prepared by the invention (common stainless steel metal wires), a powder coating prepared by the invention (without plasma treatment of metal wires), and a powder coating prepared by the invention (with metal wires treated by a coupling agent), coating different sample coatings on the surfaces of base materials with the same area made of the same material in a high-voltage electrostatic spraying manner, wherein the thickness of the coating is 50-70mm, curing is carried out by a hot-baking oven at 200 ℃ for 15min, after the coating is cured, detecting the related performance of the coating, and recording the detection result into table 1;
the performance test criteria and methods for the coatings were as follows:
the impact resistance of the coating film is referred to GB/T1732-1993;
the adhesive force of the coating refers to GB/T9286-1998;
the flexibility of the coating film is referred to GB/T6742;
TABLE 1
From the above experimental results, it can be seen that: compared with the common coating sold in the market, the coating prepared by the invention has certain improvement on the performance without adding metal wires, but the improvement range is smaller, meanwhile, after the metal wires are completely added into the powder coating prepared by the invention, the performance of the coating is obviously improved compared with the common coating, meanwhile, when the common stainless steel metal wires are added into the coating prepared by the invention, the performance of the coating is improved to a certain extent compared with the common coating, but the improvement range is smaller than that of the coating added with the metal wires, and meanwhile, when the metal wires are not subjected to plasma treatment and coupling agent treatment, the performance of the coating prepared by the invention is basically the same, but the coating still has certain superiority compared with the common coating, so that the powder coating prepared by the invention has considerable superiority and has popularization and use values.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A polyester resin powder coating is characterized in that: the paint comprises the following components in parts by weight:
40-45% of polyester resin, 15-20% of filler, 8-10% of modifier, 2-3% of benzoin, 1-1.2% of coupling agent, 0.8-1% of flatting agent, 0.5-0.7% of curing agent and the balance epoxy resin; the modifier is a mixture of nano titanium dioxide and nano silicon dioxide, and the ratio of the nano titanium dioxide to the nano silicon dioxide is 1: 1; the filler is a metal wire, and the length of the metal wire is 15-25 um; the diameter of the metal wire is 2-3 um;
the preparation method of the powder coating comprises the following steps:
s1: selecting a metal material, preparing continuous metal fibers by adopting a cluster drawing method, and then cutting the metal fibers to obtain chopped metal wires;
s2: uniformly mixing polyester resin, epoxy resin, a modifier, benzoin and a flatting agent according to a given proportion, putting the mixture into a stirring kettle, and fully stirring the raw materials in the stirring kettle;
s3: on the basis of the step S2, adding a coupling agent and a curing agent into a stirring kettle, and fully stirring and mixing to obtain a premix;
s4: on the basis of the step S3, the premix is put into a double-screw extruder, and the extruded material is tabletted and cooled to obtain a flaky material;
s5: putting the flaky material into a crusher, crushing to obtain granules, and fully mixing the chopped metal wires and the crushed granules to obtain a finished powder coating;
the metal wire is made of one-way memory metal, and the metal wire is added into the powder coating after being curled and agglomerated; when the powder coating is heated and cured, the metal wire is stretched again from a curling state and is restored to the original state; the average diameter of the metal wires after being curled and agglomerated is 5-8 um; the average diameter of the particles in the powder coating is 35 um.
2. The polyester resin powder coating according to claim 1, wherein: heating the stirring kettle at 40-55 ℃ in the process of adding raw materials into the stirring kettle and stirring; ultrasonic waves are used for auxiliary stirring in the stirring process; in the stirring process, when the modifier, the benzoin and the flatting agent are added, the stirring kettle is stirred for 30-35min at the speed of 300-350 r/min; in the stirring process, when the coupling agent and the curing agent are put into the stirring kettle, the stirring kettle is stirred for 5-8min at the speed of 700-750 r/min.
3. The polyester resin powder coating according to claim 1, wherein: after the wire is re-stretched in the heated state, the wire assumes a wavy shape.
4. The polyester resin powder coating according to claim 1, wherein: after the surface of the metal wire is treated, the metal wire is curled into a cluster; the surface treatment of the metal wire is gas-phase low-temperature plasma treatment, and the treatment time is 10-12 min.
5. The polyester resin powder coating according to claim 4, wherein: after the metal wires are curled and agglomerated, promoting treatment is carried out on the metal wires, and then the metal wires are added into the powder coating; in the process of promoting the treatment of the metal wire, putting the metal wire into a container containing a coupling agent; after the metal wire is put into the container, heating the container at the temperature of 45-55 ℃; in the process of promoting treatment, the container is vacuumized, and the container is kept in a negative pressure state; and after the metal wire is treated, adding the coupling agent left in the container as a raw material into the raw material according to a preset proportion to prepare the powder coating.
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| CN202110608488.6A CN113308176B (en) | 2021-06-01 | 2021-06-01 | Polyester resin powder coating |
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| CN202110608488.6A CN113308176B (en) | 2021-06-01 | 2021-06-01 | Polyester resin powder coating |
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| CN113308176B true CN113308176B (en) | 2022-04-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040086705A1 (en) * | 2002-11-04 | 2004-05-06 | Schneider Terry L. | Polymer composite structure reinforced with shape memory alloy and method of manufacturing same |
| JP2006505655A (en) * | 2002-11-04 | 2006-02-16 | ザ・ボーイング・カンパニー | Polymer composite structure reinforced with shape memory alloy and manufacturing method thereof |
| CN109593449A (en) * | 2018-12-20 | 2019-04-09 | 重庆七彩虹新材料技术有限公司 | A kind of thermosetting property nano modification powdery paints and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040086705A1 (en) * | 2002-11-04 | 2004-05-06 | Schneider Terry L. | Polymer composite structure reinforced with shape memory alloy and method of manufacturing same |
| JP2006505655A (en) * | 2002-11-04 | 2006-02-16 | ザ・ボーイング・カンパニー | Polymer composite structure reinforced with shape memory alloy and manufacturing method thereof |
| CN109593449A (en) * | 2018-12-20 | 2019-04-09 | 重庆七彩虹新材料技术有限公司 | A kind of thermosetting property nano modification powdery paints and preparation method thereof |
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Effective date of registration: 20220321 Address after: 315000 Industrial Development Zone, Yunlong Town, Yinzhou District, Ningbo City, Zhejiang Province Applicant after: Ningbo greens powder coating Co.,Ltd. Address before: 236000 69 households in nandaizhuang residential group, Shuanghe neighborhood committee, Quanbei office, Yingquan District, Fuyang City, Anhui Province Applicant before: Zhang Dapeng |
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