CN111040525B - PVDF metal powder coating for metal surface and preparation method thereof - Google Patents
PVDF metal powder coating for metal surface and preparation method thereof Download PDFInfo
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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
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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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
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Abstract
The invention provides a PVDF metal powder coating for metal surfaces and a preparation method thereof, wherein thermoplastic acrylic resin and PVDF resin are ground by a paste mill and then mixed with high polymers and coated aluminum powder to prepare the powder coating, and under the synergistic action of the components, the problem of uneven spraying caused by the difference of the chargeability of the components in the electrostatic spraying process of the powder coating is solved; and set up temperature control device in the fiberizer, avoid the powder to grind in-process excessive bonding for resin powder A and resin powder B microcosmic that grind out show irregular fibrous, very big improvement two kinds of resin powder probability of entangling each other in reation kettle. In addition, the PVDF resin is used for coating the aluminum powder and then is added into the reaction kettle, so that the problem that the aluminum powder is oxidized or corroded when the powder coating forms a coating can be effectively solved, and the powder coating which is uniform in bonding, high in transparency of the coating and remarkable in metal effect is obtained.
Description
Technical Field
The invention relates to the field of powder coatings, in particular to a PVDF metal powder coating for a metal surface and a preparation method thereof.
Background
Powder coating is generally adhered to a substrate, usually the surface of an alloy, by powder electrostatic gun spraying or friction gun spraying or fluidized bed dip coating, and then a coating film is formed by heating or radiation curing, so that the powder coating has good decoration and protection effects. In addition, when the PVDF powder coating is prepared by utilizing the PVDF resin, the PVDF resin is thermoplastic resin, so that the toughness is high, the PVDF resin cannot be crushed at normal temperature, the production cost is high, and the agglomeration phenomenon is easy to occur in the preparation process, so that the PVDF powder coating products in the market are fewer, and the PVDF powder coating with the metal effect is fewer. Therefore, the research on the PVDF metal powder coating with excellent comprehensive performance for the metal surface to meet the market demand has important significance.
For example, patent No. CN 106543816B discloses a preparation method of PVDF fluorocarbon powder coating, patent No. CN 104387869B discloses a preparation method of powder coating, and patent No. CN 108047836A discloses a super weather-resistant PVDF double-layer powder coating and a preparation method thereof, but none of them provides a solution for related PVDF metal powder coating.
In summary, in the field of powder coating preparation, particularly PVDF metal powder coating preparation, there are many practical problems to be treated in practical application, and no specific solutions are proposed.
Disclosure of Invention
The invention provides a PVDF metal powder coating for metal surfaces and a preparation method thereof to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the PVDF metal powder coating for the metal surface is prepared by mixing resin powder A and resin powder B according to the weight percentage of 7:3-3:7, adding high-molecular glue and coating aluminum powder;
and the resin powder A is composed of PVDF resin;
the resin powder B is composed of thermoplastic acrylic resin;
the addition amount of the polymer adhesive is 5.0-10.0% of the total resin weight percentage;
the addition amount of the coating aluminum powder is 5.0-20.0% of the total resin weight percentage.
Alternatively, the PVDF resin is a homopolymer or copolymer of vinylidene fluoride monomers.
Optionally, the thermoplastic acrylic resin is a MMA/EA copolymer.
Optionally, the polymer adhesive is a copolymer of methacrylate and an alkene monomer.
Optionally, the coated aluminum powder is a mixture of PVDF resin and aluminum powder.
In addition, a method for preparing a PVDF metal powder coating for metal surfaces is provided, the method comprising the steps of:
(1) weighing PVDF resin particles, thermoplastic acrylic resin particles, high-molecular glue and coated aluminum powder according to the component proportion of the PVDF metal powder coating for the metal surface;
(2) preparation of resin powder a: repeatedly grinding PVDF resin particles to an average particle size of 5-15 mu m by a pulping machine to obtain resin powder A for later use;
(3) preparation of resin powder B: grinding the thermoplastic acrylic resin particles to an average particle size of 5-15 mu m by a pulping machine to obtain resin powder B for later use;
(4) preparing coated aluminum powder: dissolving PVDF resin in DMAc and DMF solvents, stirring and dispersing fully, slowly adding aluminum powder under the stirring condition, increasing the stirring speed, continuously stirring for 20-60min, and recovering the solvent to obtain coated aluminum powder for later use;
(5) putting the resin powder A and the resin powder B into a reaction kettle according to the proportion, adding the polymer adhesive according to the addition amount of the weight percentage, premixing for 2-3min at normal temperature, and introducing nitrogen into the reaction kettle at the same time, wherein the nitrogen flow is 180-fold and 200L/h;
(6) adjusting the temperature, the nitrogen flow and the heat preservation time of the reaction kettle;
(7) when the average particle size of the mixture in the reaction kettle is detected to reach 25-28 microns, adding coated aluminum powder, and simultaneously adjusting the nitrogen flow and the heat preservation time;
(8) when the average particle size of the mixture in the reaction kettle is detected to reach 33-38 mu m, the temperature is reduced to room temperature at the speed of 10-20 ℃/S, and the PVDF metal powder coating is obtained.
Optionally, in the step (4), the mixture is stirred under vacuum, the excess solvent is gradually volatilized, and the solvent is collected by a storage tank in the vacuum pipeline and recycled.
Optionally, in the step (4), the PVDF resin is dissolved in DMAc and DMF solvent, the rotation speed of the full stirring is 800r/min, and after the aluminum powder is slowly added, the rotation speed of the stirring is increased to 1500r/min of 1000-.
Optionally, the temperature of the reaction kettle in the step (6) is adjusted to be 120 ℃ for 100-.
Optionally, the flow rate of the nitrogen gas in the step (7) is regulated to be 220-250L/h, and the heat preservation time is 5-10 min.
Compared with the prior art, the invention has the beneficial technical effects that:
1. in the preparation method, the thermoplastic acrylic resin and the PVDF resin are directly ground into particles with the average particle size of 5-15 mu m, and are not required to be crushed after being extruded and mixed with pigments, fillers and additives, so that the process is simplified, the production efficiency of the powder coating is improved, and meanwhile, the temperature control device is arranged in the pulping machine to absorb and transfer heat generated in the grinding process, so that powder adhesion is avoided, and the subsequent processing is facilitated.
2. According to the invention, the resin powder A and the resin powder B are respectively prepared by adopting the pulping machine, so that the problem that the limitation is caused by the grinding of the PVDF resin at normal temperature is solved, and the ground resin powder A and the ground resin powder B are microscopically irregular fibrous, so that the probability of mutual entanglement of the two resin powders in a reaction kettle can be greatly improved, and the two resin powders are quickly and firmly combined to the required particle size.
3. The PVDF resin is used for coating the aluminum powder and then is added into the reaction kettle, so that the problem that the aluminum powder is oxidized or corroded when the powder coating forms a coating can be effectively solved, and the coating is promoted to have better weather resistance.
4. The powder coating is not easy to agglomerate in the preparation process, and the problem of uneven spraying of the powder caused by the difference of the electrification properties of the components in the electrostatic spraying process is solved by mixing the polymer adhesive with the PVDF resin powder, the thermoplastic acrylic resin powder and the coated aluminum powder and under the synergistic effect of the components.
5. In combination, the particles of the powder coating are uniformly mixed and bonded, the powder coating has high transparency in the process of forming a coating, and the powder coating has an obvious metal effect and can meet the market demand.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
FIG. 1 is a schematic flow chart of a PVDF metal powder coating for metal surface and a preparation method thereof in one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows. The examples are for illustrative purposes and are not to be construed as limiting the patent, and those skilled in the art will understand the specific meaning of the terms in the context of their specific situation.
The invention relates to a PVDF metal powder coating for metal surface and a preparation method thereof, which are shown in the figure and described as the following examples:
in the present invention, DMAc is named as dimethylacetamide and DMF is named as N, N-dimethylformamide.
Example 1:
the PVDF metal powder coating for the metal surface is prepared by mixing resin powder A and resin powder B according to the weight percentage of 7:3, adding high-molecular glue and coating aluminum powder;
the addition amount of the polymer adhesive is 10.0 percent of the total resin weight percentage;
the addition amount of the coating aluminum powder is 20.0 percent of the total resin weight percentage.
Wherein the resin powder A is composed of PVDF resin; the resin powder B is composed of thermoplastic acrylic resin; the PVDF resin is a homopolymer or a copolymer of vinylidene fluoride monomers; the thermoplastic acrylic resin is a MMA/EA copolymer; the high polymer adhesive is a copolymer of methacrylate and an alkene monomer; the coated aluminum powder is a mixture of PVDF resin and aluminum powder.
In the invention, the resin powder A and the resin powder B are ground by a refiner, the refiner is provided with a grinding cavity and a screening device, a feeding hole is arranged above the grinding cavity, a discharging hole is arranged below the grinding cavity, the screening device is arranged at the bottom of the grinding cavity and above the discharging hole, when the refiner is used for grinding, screen holes on the screening device can pass through the resin powder with the particle size of 5-15 microns, and in the embodiment, the screen holes can pass through the resin powder with the particle size of 5 microns; in addition, the bottom of the refiner is also provided with a temperature control device, the temperature control device is provided with a temperature sensor, and when the temperature sensor detects that the temperature of the refiner reaches a set temperature, the temperature in the refiner is adjusted through the temperature control device, so that the phenomenon that the grinding temperature is too high, powder is bonded and subsequent processing is not facilitated is prevented.
In addition, a method for preparing a PVDF metal powder coating for metal surfaces is provided, the method comprising the steps of:
(1) weighing PVDF resin particles, thermoplastic acrylic resin particles, high-molecular glue and coated aluminum powder according to the component proportion of the PVDF metal powder coating for the metal surface;
(2) preparation of resin powder a: repeatedly grinding PVDF resin particles to an average particle size of 5 microns by a pulping machine to obtain resin powder A for later use;
(3) preparation of resin powder B: grinding the thermoplastic acrylic resin particles to an average particle size of 5 microns by a pulping machine to obtain resin powder B for later use;
(4) preparing coated aluminum powder: dissolving PVDF resin in DMAc and DMF solvents, fully stirring and dispersing at the speed of 300r/min, slowly adding aluminum powder under the stirring condition, continuously stirring for 20min at the speed of 1000r/min, stirring the mixture under the vacuum condition, gradually volatilizing redundant solvents, collecting the solvents through a storage tank in a vacuum pipeline, and recycling to obtain coated aluminum powder for later use;
(5) putting the resin powder A and the resin powder B into a reaction kettle according to the proportion, adding the polymer adhesive according to the addition amount of the weight percentage, premixing for 2min at normal temperature, and introducing nitrogen into the reaction kettle at the same time, wherein the nitrogen flow is 180L/h;
(6) adjusting the temperature of the reaction kettle to 120 ℃, adjusting the nitrogen flow to 270L/h and adjusting the heat preservation time to 10 min;
(7) when the average particle size of the mixture in the reaction kettle is detected to reach 25 micrometers, adding the coated aluminum powder, adjusting the nitrogen flow to 220L/h, and adjusting the heat preservation time to 5 min;
(8) when the average particle size of the mixture in the reaction kettle is detected to reach 33 mu m, the temperature is reduced to room temperature at the speed of 10 ℃/S, and sample powder 1 of the PVDF metal powder coating is obtained.
Example 2:
the PVDF metal powder coating for the metal surface is prepared by mixing resin powder A and resin powder B according to the weight percentage of 3:7, adding high-molecular glue and coating aluminum powder;
the addition amount of the polymer adhesive is 5.0 percent of the total resin weight percentage;
the addition amount of the coating aluminum powder is 20.0 percent of the total resin weight percentage.
Wherein the resin powder A is composed of PVDF resin; the resin powder B is composed of thermoplastic acrylic resin; the PVDF resin is a homopolymer or a copolymer of vinylidene fluoride monomers; the thermoplastic acrylic resin is a MMA/EA copolymer; the high polymer adhesive is a copolymer of methacrylate and an alkene monomer; the coated aluminum powder is a mixture of PVDF resin and aluminum powder.
In the invention, the resin powder A and the resin powder B are ground by a refiner, the refiner is provided with a grinding cavity and a screening device, a feeding hole is arranged above the grinding cavity, a discharging hole is arranged below the grinding cavity, the screening device is arranged at the bottom of the grinding cavity and above the discharging hole, when the refiner is used for grinding, screen holes on the screening device can pass through the resin powder with the particle size of 15 microns, and in the embodiment, the screen holes can pass through the resin powder with the particle size of 15 microns; in addition, the bottom of the refiner is also provided with a temperature control device, the temperature control device is provided with a temperature sensor, and when the temperature sensor detects that the temperature of the refiner reaches a set temperature, the temperature in the refiner is adjusted through the temperature control device, so that the phenomenon that the grinding temperature is too high, powder is bonded and subsequent processing is not facilitated is prevented.
In addition, a method for preparing a PVDF metal powder coating for metal surfaces is provided, the method comprising the steps of:
(1) weighing PVDF resin particles, thermoplastic acrylic resin particles, high-molecular glue and coated aluminum powder according to the component proportion of the PVDF metal powder coating for the metal surface;
(2) preparation of resin powder a: repeatedly grinding PVDF resin particles to an average particle size of 15 microns by a pulping machine to obtain resin powder A for later use;
(3) preparation of resin powder B: grinding the thermoplastic acrylic resin particles to an average particle size of 15 microns by a pulping machine to obtain resin powder B for later use;
(4) preparing coated aluminum powder: dissolving PVDF resin in DMAc and DMF solvents, fully stirring and dispersing at the speed of 800r/min, slowly adding aluminum powder under the stirring condition, continuously stirring at the speed of 1500r/min for 20min, stirring the mixture under the vacuum condition, gradually volatilizing redundant solvents, collecting the solvents through a storage tank in a vacuum pipeline, and recycling to obtain coated aluminum powder for later use;
(5) putting the resin powder A and the resin powder B into a reaction kettle according to the proportion, adding the polymer adhesive according to the addition amount of the weight percentage, premixing for 3min at normal temperature, and introducing nitrogen into the reaction kettle at the same time, wherein the nitrogen flow is 200L/h;
(6) adjusting the temperature of the reaction kettle to 120 ℃, adjusting the nitrogen flow to 300L/h and adjusting the heat preservation time to 30 min;
(7) when the average particle size of the mixture in the reaction kettle is detected to reach 28 micrometers, adding the coated aluminum powder, adjusting the nitrogen flow to 250L/h, and adjusting the heat preservation time to 10 min;
(8) and when the average particle size of the mixture in the reaction kettle is detected to reach 38 mu m, reducing the temperature to room temperature at the speed of 10-20 ℃/S to obtain sample powder 2 of the PVDF metal powder coating.
Example 3:
the PVDF metal powder coating for the metal surface is prepared by mixing resin powder A and resin powder B according to the weight percentage of 7:3, adding high-molecular glue and coating aluminum powder;
the addition amount of the polymer adhesive is 8.0 percent of the total resin weight percentage;
the addition amount of the coating aluminum powder is 20.0 percent of the total resin weight percentage.
Wherein the resin powder A is composed of PVDF resin; the resin powder B is composed of thermoplastic acrylic resin; the PVDF resin is a homopolymer or a copolymer of vinylidene fluoride monomers; the thermoplastic acrylic resin is a MMA/EA copolymer; the high polymer adhesive is a copolymer of methacrylate and an alkene monomer; the coated aluminum powder is a mixture of PVDF resin and aluminum powder.
In the invention, the resin powder A and the resin powder B are ground by a refiner, the refiner is provided with a grinding cavity and a screening device, a feeding hole is arranged above the grinding cavity, a discharging hole is arranged below the grinding cavity, the screening device is arranged at the bottom of the grinding cavity and above the discharging hole, when the refiner is used for grinding operation, screen holes on the screening device can pass through the resin powder with the particle size of 15 microns, and in the embodiment, the screen holes can pass through the resin powder with the particle size of 10 microns; in addition, the bottom of the refiner is also provided with a temperature control device, the temperature control device is provided with a temperature sensor, and when the temperature sensor detects that the temperature of the refiner reaches a set temperature, the temperature in the refiner is adjusted through the temperature control device, so that the phenomenon that the grinding temperature is too high, powder is bonded and subsequent processing is not facilitated is prevented.
In addition, a method for preparing a PVDF metal powder coating for metal surfaces is provided, the method comprising the steps of:
(1) weighing PVDF resin particles, thermoplastic acrylic resin particles, high-molecular glue and coated aluminum powder according to the component proportion of the PVDF metal powder coating for the metal surface;
(2) preparation of resin powder a: repeatedly grinding PVDF resin particles to an average particle size of 10 microns by a pulping machine to obtain resin powder A for later use;
(3) preparation of resin powder B: grinding thermoplastic acrylic resin particles to an average particle size of 10 microns by a pulping machine to obtain resin powder B for later use;
(4) preparing coated aluminum powder: dissolving PVDF resin in DMAc and DMF solvents, fully stirring and dispersing at the speed of 500r/min, slowly adding aluminum powder under the stirring condition, continuously stirring at the speed of 1200r/min for 40min, stirring the mixture under the vacuum condition, gradually volatilizing redundant solvents, collecting the solvents through a storage tank in a vacuum pipeline, and recycling to obtain coated aluminum powder for later use;
(5) putting the resin powder A and the resin powder B into a reaction kettle according to the proportion, adding the polymer adhesive according to the addition amount of the weight percentage, premixing for 3min at normal temperature, and introducing nitrogen into the reaction kettle at the same time, wherein the nitrogen flow is 200L/h;
(6) adjusting the temperature of the reaction kettle to 110 ℃, adjusting the nitrogen flow to 300L/h and adjusting the heat preservation time to 30 min;
(7) when the average particle size of the mixture in the reaction kettle is detected to reach 25 micrometers, adding the coated aluminum powder, adjusting the nitrogen flow to 220L/h and adjusting the heat preservation time to 10 min;
(8) when the average particle size of the mixture in the reaction kettle is detected to reach 33 mu m, the temperature is reduced to room temperature at the speed of 20 ℃/S, and sample powder 3 of the PVDF metal powder coating is obtained.
In this embodiment, reation kettle is provided with the particle size detector, just can collect the particle size of reation kettle internal mixture through adjusting the particle size detector, and then has the guide effect to powder production, moreover, can guarantee the requirement to the particle size in the powder coating production process.
Comparative example 1
The only difference from example 3 is that resin powder A and resin powder B are 5:1 by weight, and other ingredients, preparation methods and equipment are unchanged, thus obtaining sample powder 4.
Comparative example 2
The only difference from example 3 is that no polymer gum was added, and other ingredients, preparation method and equipment were not changed to prepare sample powder 5.
Comparative example 3
The only difference from example 3 is that sample powder 6 was prepared using the acrylic-coated aluminum powder, and the other components, preparation method and equipment were not changed.
Comparative example 4
The PVDF metal powder coating for the metal surface is prepared by mixing resin powder A and resin powder B according to the weight percentage of 7:3, adding high-molecular glue and coating aluminum powder;
the addition amount of the polymer adhesive is 8.0 percent of the total resin weight percentage;
the addition amount of the coating aluminum powder is 20.0 percent of the total resin weight percentage.
Wherein the resin powder A is composed of PVDF resin; the resin powder B is composed of thermoplastic acrylic resin; the PVDF resin is a homopolymer or a copolymer of vinylidene fluoride monomers; the thermoplastic acrylic resin is a MMA/EA copolymer; the high polymer adhesive is a copolymer of methacrylate and an alkene monomer; the coated aluminum powder is a mixture of PVDF resin and aluminum powder.
A method for preparing a PVDF metal powder coating for metal surfaces, the method comprising the steps of:
(1) weighing PVDF resin particles, thermoplastic acrylic resin particles, high-molecular glue and coated aluminum powder according to the component proportion of the PVDF metal powder coating for the metal surface;
(2) preparation of resin powder a: repeatedly grinding PVDF resin particles to an average particle size of 50 microns by a pulping machine to obtain resin powder A for later use;
(3) preparation of resin powder B: grinding the thermoplastic acrylic resin particles to an average particle size of 50 microns by a pulping machine to obtain resin powder B for later use;
(4) preparing coated aluminum powder: dissolving PVDF resin in DMAc and DMF solvents, fully stirring and dispersing at the speed of 500r/min, slowly adding aluminum powder under the stirring condition, continuously stirring at the speed of 1200r/min for 40min, stirring the mixture under the vacuum condition, gradually volatilizing redundant solvents, collecting the solvents through a storage tank in a vacuum pipeline, and recycling to obtain coated aluminum powder for later use;
(5) putting the resin powder A and the resin powder B into a reaction kettle according to the proportion, adding the polymer adhesive according to the addition amount of the weight percentage, premixing for 3min at normal temperature, and introducing nitrogen into the reaction kettle at the same time, wherein the nitrogen flow is 200L/h;
(6) adjusting the temperature of the reaction kettle to 110 ℃, adjusting the nitrogen flow to 300L/h and adjusting the heat preservation time to 30 min;
(7) when the average particle size of the mixture in the reaction kettle is detected to reach 25 micrometers, adding the coated aluminum powder, adjusting the nitrogen flow to 220L/h and adjusting the heat preservation time to 10 min;
(8) when the average particle size of the mixture in the reaction kettle is detected to reach 33 mu m, the temperature is reduced to room temperature at the speed of 20 ℃/S, and sample powder 7 is prepared.
The sample powders 1, 2 and 3 prepared in the example and the sample powders 4, 5, 6 and 7 prepared in the comparative example are electrostatically sprayed on a 2m x 3m plane aluminum surface, baked and cured, and the performance comparison results are shown in the following table 1:
TABLE 1
From the analysis in the data records of table 1 it can be seen that: from the analysis of the sample powder prepared in examples 1-3, the powder coating prepared by the invention has excellent metal effect, the formed coating has obvious weather resistance, and the metal is uniformly distributed, and as can be seen from the comparison of the sample powder 3 and the sample powder 4, the resin powder A and the resin powder B in the sample powder 4 are different in the adding proportion in the preparation process, so that the appearance and the performance of the powder coating in the coating forming process are different, and the performance of the sample powder 4 is not as obvious as that of the sample powder 3; the sample powder 5 is not added with polymer glue, so that the combination efficiency of the mixture is extremely low, the electrostatic spraying is not uniform, and the surface effect and the performance of the coating are obviously reduced; the aluminum powder coated by the acrylic acid is used in the sample powder 6, the light retention rate of an ultraviolet lamp accelerated aging test of the coating is reduced, the part of the surface layer is blackened, and the acetic acid salt fog test coating is bubbled, which shows that the aluminum powder coated by the PVDF resin can solve the problem that when the aluminum powder is not coated or coated by other materials with weather resistance grades lower than that of the PVDF resin, part of the aluminum powder is exposed to the surface of the coating and contacts with air to blacken or corrode; the particle sizes of the resin powder A and the resin powder B prepared in sample powder 7 are different from those of example 3, but the coating forming performance is inferior to that of sample powder 3, which shows that controlling the particle size of the pigment has an effect on the binding strength of the resin powder A and the resin powder B in the powder coating preparation process.
In sum, the preparation method provided by the invention can effectively solve the problem that the aluminum powder is oxidized or corroded when the powder coating forms a coating, and the coating formed by the powder coating has better uniformity and weather resistance.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, e.g., well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
It is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (6)
1. The PVDF metal powder coating for the metal surface is characterized by being prepared by mixing resin powder A and resin powder B according to the weight percentage of 7:3-3:7, adding high-molecular glue and coating aluminum powder; and the resin powder A is composed of PVDF resin; the resin powder B is composed of thermoplastic acrylic resin; the addition amount of the polymer adhesive is 5.0-10.0% of the total resin weight percentage; the addition amount of the coating aluminum powder is 5.0-20.0% of the total resin weight percentage;
the high polymer adhesive is a copolymer of methacrylate and an alkene monomer;
the PVDF resin is a homopolymer or a copolymer of vinylidene fluoride monomers;
the preparation method of the PVDF metal powder coating for the metal surface comprises the following steps:
(1) weighing PVDF resin particles, thermoplastic acrylic resin particles, high-molecular glue and coated aluminum powder according to the component proportion of the PVDF metal powder coating for the metal surface;
(2) preparation of resin powder a: repeatedly grinding PVDF resin particles to an average particle size of 5-15 mu m by a pulping machine to obtain resin powder A for later use;
(3) preparation of resin powder B: grinding the thermoplastic acrylic resin particles to an average particle size of 5-15 mu m by a pulping machine to obtain resin powder B for later use;
(4) preparing coated aluminum powder: dissolving PVDF resin in DMAc and DMF solvent, fully stirring and dispersing at the rotation speed of 300-1500 r/min, slowly adding aluminum powder under the stirring condition, increasing the stirring rotation speed to 1000-1500r/min, continuously stirring for 20-60min, and recovering the solvent to obtain coated aluminum powder for later use;
(5) putting the resin powder A and the resin powder B into a reaction kettle according to the proportion, adding the polymer adhesive according to the addition amount of the weight percentage, premixing for 2-3min at normal temperature, and introducing nitrogen into the reaction kettle at the same time, wherein the nitrogen flow is 180-fold and 200L/h;
(6) adjusting the temperature, the nitrogen flow and the heat preservation time of the reaction kettle;
(7) when the average particle size of the mixture in the reaction kettle is detected to reach 25-28 microns, adding coated aluminum powder, and simultaneously adjusting the nitrogen flow and the heat preservation time;
(8) when the average particle size of the mixture in the reaction kettle is detected to reach 33-38 mu m, cooling to room temperature at the speed of 10-20 ℃/S to obtain the PVDF metal powder coating;
the pulping machine is provided with a grinding cavity and a screening device, a feeding hole is formed above the grinding cavity, a discharging hole is formed below the grinding cavity, the screening device is arranged at the bottom of the grinding cavity and above the discharging hole, and when the pulping machine carries out grinding operation, screen holes in the screening device can pass through resin powder with the particle size of 5-15 mu m;
the bottom of the refiner is also provided with a temperature control device, and the temperature control device is provided with a temperature sensor.
2. PVDF metal powder coating for metal surfaces, according to claim 1, characterized in that said thermoplastic acrylic resin is a MMA/EA copolymer.
3. The PVDF metal powder coating for metal surfaces as claimed in claim 1, wherein the coated aluminum powder is a mixture of PVDF resin and aluminum powder.
4. The PVDF metal powder coating for metal surfaces as claimed in claim 1, wherein step (4) is to stir the mixture under vacuum, gradually evaporate the excess solvent, collect the solvent by a storage tank in the vacuum line, and recycle it.
5. The PVDF metal powder coating for metal surface as defined in claim 1, wherein in step (6), the temperature of the reaction kettle is adjusted to 120 ℃ at 100 ℃, the nitrogen flow is adjusted to 300L/h at 270 ℃, and the heat preservation time is adjusted to 10-30 min.
6. The PVDF metal powder coating for metal surface as defined in claim 1, wherein the regulated nitrogen flow in step (7) is 220L/h and the holding time is 5-10 min.
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