CN109762440B - Low-temperature curing powder coating and preparation method thereof - Google Patents
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Abstract
The invention provides a low-temperature curing powder coating and a preparation method thereof, wherein a two-component process is adopted, materials such as epoxy resin, polyester resin or amino curing agent are used as a component A, materials such as curing accelerator are dispersed into the polyester resin to be used as a component B, A, B component sample powder is prepared through the processes of melt extrusion, tabletting, cooling, crushing, fine crushing, cyclone separation, screening and the like, and A, B component powder is recombined according to the mass ratio of 95/5-80/20 through a re-granulation technology to prepare a low-temperature curing powder product. The invention greatly reduces the contact between the epoxy resin and the curing accelerator through a two-component process and a re-granulation technology, avoids the pre-reaction generated in the powder extrusion process, greatly improves the storage stability of a powder system, and ensures the appearance and related physical properties of a coating film.
Description
Technical Field
The invention belongs to the technical field of powder coatings, and particularly relates to a low-temperature curing type powder coating and a preparation method thereof.
Background
Thermosetting powder coatings are various in variety, but the thermosetting powder coatings can be crosslinked to form a film only after being cured at a high temperature of 180-200 ℃ for 10-20 min for a long time, so that the powder coatings do not have absolute advantages in energy conservation and environmental protection compared with traditional solvent-based coatings, and the coating of the powder coatings on other base materials (MDF, plastics, thermosensitive materials and the like) is limited.
The current low-temperature powder curing technology still has some difficulties:
(1) when the powder coating system is prepared, pre-reaction is easy to occur due to overhigh temperature in the melting and extrusion process so as to generate gelled particles, and the appearance and the decorative effect of a coating film are influenced finally;
(2) the contradiction between high reactivity and poor latency of low-temperature curing powder is represented by poor storage stability of the powder, harsh storage conditions of the powder, generally, the storage temperature is required to be below 25 ℃, and the storage period is not more than 3 months.
(3) The powder coating has high viscosity and low crosslinking degree when the baking temperature is low, so that the leveling property, the physical property and the like of a final coating film are difficult to ensure.
Disclosure of Invention
The invention aims to provide a low-temperature curing powder coating and a preparation method thereof aiming at the defects in the prior art, and the coating has good film coating performance and storage stability. In order to achieve the purpose, the invention adopts the following technical scheme:
a low-temperature curing powder coating is prepared by preparing corresponding powder from the following A, B components according to the formula mass percentage, mixing A, B component powder according to the mass ratio of 95/5-80/20, and performing granulation technology:
the component A powder comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent;
the component B powder comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent.
The curing agent is polyester resin or amino curing agent, and when the curing agent is polyester resin, the mass percent is 0-40.0%, and when the curing agent is amino curing agent, the mass percent is 0-5.0%.
Further, the polyester resin comprises one or more of amorphous carboxyl-terminated polyester resin and semi-crystalline resin.
Further, the number average molecular weight of the amorphous carboxyl-terminated polyester resin is 5000-10000, the glass transition temperature is more than 50 ℃, the acid value is 30-90 mgKOH/g, the number average molecular weight of the semi-crystalline resin is 3000-6000, the glass transition temperature is more than 30 ℃, the acid value is 30-60 mgKOH/g, and the hydroxyl value is less than or equal to 5 mgKOH/g.
Further, the epoxy resin may include one or more of bisphenol a type epoxy resin, phenol modified epoxy resin, and alicyclic epoxy resin.
Further, the wetting aid comprises semi-crystalline resin, the number average molecular weight of the semi-crystalline resin is 2500-4500, the glass transition temperature is above 30 ℃, the acid value is 20-40 mgKOH/g, and the hydroxyl value is less than or equal to 5 mgKOH/g.
Further, the amino curing agent is a compound containing active hydrogen capable of reacting with an epoxy group, and comprises one or more of dicyandiamide, substituted dicyandiamide, dicarboxylic dihydrazide compounds and the like.
Further, the surface modifying agent contains both an organophilic group and an organophilic group.
Further, the other auxiliary agents comprise one or more of leveling agents, brightening agents, degassing agents, antioxidants, scratch resistance agents, anti-yellowing agents, charge enhancing agents, light stabilizers and ultraviolet absorbers, antibacterial agents, leveling agents and gloss improvement additives.
Further, the curing agent accelerator is an imidazole or cyclic amidine heterocyclic compound.
In addition, the preparation method of the low-temperature curing powder coating comprises the following operation steps:
(1) premixing, melting and extruding the raw materials of the A, B component formula according to the corresponding mass percentage, tabletting and cooling, and finally crushing and screening the raw materials to obtain powder particles with proper particle size, wherein the median particle size of the A component powder is 20-30 mu m, and the median particle size of the B component powder is 15-30 mu m;
(2) premixing A, B component powder prepared in the step (1) according to a mass ratio of 95/5-80/20, adding the premixed A, B component powder into a granulator, and stirring, heating, bonding and granulating at 50-80 ℃ to prepare granules;
(3) and (3) coarsely crushing the particles prepared in the step (2), and crushing and screening the particles into powder particles with the median particle size of 30-40 microns by using a pulverizer to obtain the low-temperature curing powder coating product.
Compared with the prior art, the low-temperature curing powder coating and the preparation method thereof mainly have the following advantages:
the coating process of the low-temperature curing powder coating product is closer to that of common powder coatings, but by the aid of the formula auxiliary agent, the preparation process, the re-granulation technology and other processes, a powder coating system is not easy to generate gelled particles in the preparation process, and the appearance and the decorative effect of a coating film are better; the storage stability is good, the storage condition requirement is not high, and the better smoothness and good physical properties of the coating film are ensured; the powder has low viscosity during low-temperature baking and still maintains higher crosslinking degree, so that the finally produced coating has better leveling property and other physical properties. The application range of the powder coating is expanded by improving the technical difficulty of low-temperature curing of the powder through the technology.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. The process is conventional unless otherwise specified, and the starting materials are commercially available from published sources.
Example 1
A low-temperature curing powder coating comprises a component A and a component B which are prepared into powder according to the mass percentage of a formula respectively, and A, B component powder is mixed according to the mass ratio of 95/5-80/20 through a re-granulation technology to prepare a low-temperature curing powder product.
The component A powder comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent;
the component B powder comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent.
The curing agent is polyester resin or amino curing agent, and when the curing agent is polyester resin, the mass percent is 0-40.0%, and when the curing agent is amino curing agent, the mass percent is 0-5.0%.
The preparation of the low-temperature curing powder coating adopts a two-component process, epoxy resin and polyester resin or amino curing agent are used as a component A, and the curing accelerator is dispersed into the polyester resin to be used as a component B. In addition, the dosage of the curing accelerator can be adjusted by adjusting the proportion of the A/B component, namely the reaction activity of the epoxy resin and the polyester resin or the amino curing agent can be adjusted, and the required reaction temperature and time can be effectively controlled.
The polyester resin includes one or more of amorphous carboxyl-terminated polyester resins, semi-crystalline resins, and the like, wherein the polyester resin is specifically a polymer prepared by condensation or addition of one or more of polycarboxylic acids or anhydrides such as terephthalic acid, isophthalic acid, phthalic acid, trimellitic anhydride, pyromellitic anhydride, adipic acid, azelaic acid, sebacic acid, and the like, and one or more of polyols such as ethylene glycol, propylene glycol, neopentyl glycol, 2-methylpropanediol, 1, 6-hexanediol, glycerol, trimethylolpropane, and the like.
The number average molecular weight of the amorphous carboxyl-terminated polyester resin is 5000-10000, the glass transition temperature is above 50 ℃, the acid value is 30-90 mgKOH/g, the number average molecular weight of the semi-crystalline resin is 3000-6000, the glass transition temperature is above 30 ℃, the acid value is 30-60 mgKOH/g, and the hydroxyl value is less than or equal to 5 mgKOH/g.
The epoxy resin can comprise one or more of bisphenol A epoxy resin, phenolic aldehyde modified epoxy resin, alicyclic epoxy resin and the like, and the epoxy resin preferably has an epoxy equivalent of 600-1000 g/eq and a softening point of 80-95 ℃.
The amino curing agent is a compound containing active hydrogen capable of reacting with an epoxy group, wherein the compound can comprise one or more of dicyandiamide, substituted dicyandiamide, dicarboxylic dihydrazide compounds and the like.
The wetting aid comprises semi-crystalline resin, the number average molecular weight of the semi-crystalline resin is 2500-4500, the glass transition temperature is above 30 ℃, the acid value is 20-40 mgKOH/g, and the hydroxyl value is less than or equal to 5 mgKOH/g; the viscosity of the powder is very low above 80 ℃, materials in the formula can be greatly wetted, the materials can be more uniformly dispersed, and the combination degree of two kinds of powder can be improved by a subsequent re-granulation technology.
The surface modifier contains both an inorganic group and an organic group, and can comprise one or more of an organic chromium complex coupling agent, a silane coupling agent, a titanate coupling agent and an aluminate compound, and the titanate coupling agent and the silane coupling agent are preferably used; on one hand, the compatibility, wettability and dispersibility of the resin and the pigment and filler can be improved, and on the other hand, the bonding strength of the powder coating and the base material can be enhanced, so that the physical properties of impact resistance, adhesive force and the like of the coating film are improved.
The other additives may significantly improve certain properties of the powder or coating and may include one or more of leveling agents, gloss enhancers, degassing agents such as benzoin and the like, antioxidants, scratch resistance agents, anti-yellowing agents, charge enhancers, light and uv absorbers, antimicrobial agents, flow levelers, and gloss modifying additives.
The filler may comprise one or more of magnesium silicates such as talc, meta-aluminates such as kaolin, mica powder and the like, inorganic sulfates such as barite, carbonates such as calcium carbonate and the like are commonly used.
The curing agent accelerator is imidazole or cyclic amidine heterocyclic compounds, and can comprise one or more of 2-methylimidazole, 2-ethylimidazole 2, 4-dimethylimidazole, cyclic amidine and the like.
In addition, the embodiment also provides a novel preparation method of the low-temperature curing powder coating, which comprises the following steps:
(1) premixing, melting and extruding the raw materials of the A, B component formula according to the corresponding mass percentage, tabletting and cooling, and finally crushing and screening the raw materials to obtain powder particles with proper particle size, wherein the median particle size of the A component powder is 20-30 mu m, and the median particle size of the B component powder is 15-30 mu m;
(2) premixing A, B component powder prepared in the step (1) according to a mass ratio of 95/5-80/20, adding the premixed A, B component powder into a granulator, and stirring and heating, bonding, granulating and the like at 50-80 ℃ to prepare granules;
(3) and (3) coarsely crushing the particles prepared in the step (2), and crushing and screening the particles into powder particles with the median particle size of 30-40 microns by using a grinding mill, namely the low-temperature curing powder coating.
Specifically, the median particle diameters of the component A powder and the component B powder in the step (1) are respectively 20-30 μm and 15-30 μm, the component B powder is fully dispersed into the component A powder, the component B powder is used as a curing promoting component of the component A powder, and the smaller the particle size is, the smaller the influence on the appearance of the coating film is.
Specifically, the equipment used for melt extrusion in the step (1) is a double-screw extruder, wherein the temperature of the zone I is set to be 90-105 ℃, and the temperature of the zone II is set to be 85-95 ℃.
Specifically, the granulator in the step (2) is equipment comprising a feeding hole, a discharging hole, a stirring device, a heating or cooling system, a central control system and the like.
Specifically, the regranulation technology in the step (3) is a regranulation technology which is adopted by the invention and can regroup a plurality of kinds of powder to prepare one kind of powder, the regranulation technology is characterized in that under a certain temperature condition, two components of powder are regrouped to form coarse powder particles through the combined action of external stirring of equipment and auxiliary agents such as wetting agents and the like in a powder system, and then the coarse powder particles are crushed and screened by a grinding machine to obtain a powder product with a proper particle size.
The low-temperature curing powder coating belongs to an energy-saving environment-friendly coating, the production and coating processes of the low-temperature curing powder coating are closer to those of a common powder coating, the problems of easy pre-reaction of powder preparation, poor powder storage stability and the like are solved through a formula auxiliary agent, a preparation process and a re-granulation technology, and the good smoothness and good physical properties of a coating film are ensured.
Example 2
Preparing low-temperature curing type powder coating sample powder according to the following steps:
(1) the following A, B component raw materials are respectively premixed according to the mass percentage:
the component A powder comprises the following raw materials in percentage by mass:
the component B powder comprises the following raw materials in percentage by mass:
the polyester resin is prepared by condensing phthalic acid, adipic acid, neopentyl glycol, ethylene glycol, glycerol and the like, and has the number average molecular weight of 4800-7000, the glass transition temperature of 68 ℃ and the acid value of 30-38 mgKOH/g.
The epoxy resin is bisphenol A type epoxy resin.
The number average molecular weight of the wetting aid is 3000-4000, the glass transition temperature is 40 ℃, the acid value is 28-32 mgKOH/g, and the hydroxyl value is less than or equal to 5 mgKOH/g.
The surface modifier is an organic complex coupling agent.
The curing accelerator is an imidazole compound.
The filler is barite.
(2) Respectively carrying out melt mixing extrusion on the premixed A, B component raw materials by using a double-screw extruder, wherein the temperature of an extruder I area is 100-105 ℃, and the temperature of an extruder II area is 90-95 ℃, wherein the extruder I area is an extruder melt mixing section, and the extruder II area is an extruder feeding section;
(3) tabletting, cooling and crushing the extruded A, B component material, and respectively carrying out fine crushing on the crushed material by using an ACM (acid-milling and mechanical grinding) mill until the median particle size of the powder is 25-27 mu m and 20-23 mu m;
(4) premixing the A, B component powder according to the mass ratio of 95/5, adding the premixed A, B component powder into a granulator, and stirring and heating, bonding, granulating and the like at 50-80 ℃ to prepare granules;
(5) and (3) after the prepared particles are coarsely crushed, crushing and screening the particles by using a grinding mill until the median particle size is within the range of 35-40 mu m, thus obtaining sample powder.
Example 3
Preparing low-temperature curing type powder coating sample powder according to the following steps:
(1) the following A, B component raw materials are respectively premixed according to the mass percentage:
the component A comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent;
the component B comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent.
The polyester resin is prepared by condensing isophthalic acid, azelaic acid, neopentyl glycol, ethylene glycol, 2-methyl propylene glycol and the like, and has the number average molecular weight of 3300-5800, the vitrification temperature of 65 ℃ and the acid value of 30-38 mgKOH/g.
The epoxy resin is phenolic aldehyde modified epoxy resin.
The wetting auxiliary has the number average molecular weight of 3200-3600, the glass transition temperature of 38 ℃ and the acid value of 20-25 mgKOH/g.
The surface modifier is titanate coupling agent.
The curing accelerator is a cyclic amidine heterocyclic compound.
The filler is barite and kaolin.
(2) Respectively carrying out melt mixing extrusion on the premixed A, B component raw materials by using a double-screw extruder, wherein the temperature of an extruder I area is 100-105 ℃, and the temperature of an extruder II area is 90-95 ℃, wherein the extruder I area is an extruder melt mixing section, and the extruder II area is an extruder feeding section;
(3) tabletting, cooling and crushing the extruded A, B component material, and respectively carrying out fine crushing on the crushed material by using an ACM (acid-milling and mechanical grinding) mill until the median particle size of the powder is 25-27 mu m and 20-23 mu m;
(4) premixing the A, B component powder according to the mass ratio of 85/15, adding the premixed A, B component powder into a granulator, and stirring and heating, bonding, granulating and the like at 50-80 ℃ to prepare granules;
(5) and (3) coarsely crushing the prepared particles, and then crushing and screening the particles by using a grinding machine until the median particle size is within the range of 30-35 mu m to obtain sample powder.
Example 4
Preparing low-temperature curing type powder coating sample powder by the following steps:
(1) the following A, B component raw materials are respectively premixed according to the mass percentage;
the component A comprises the following raw materials in percentage by mass:
the component B comprises the following raw materials in percentage by mass:
the epoxy resin is bisphenol A type epoxy resin.
The polyester resin is prepared by condensing adipic acid, neopentyl glycol, ethylene glycol, 2-methyl propylene glycol and the like, the number average molecular weight of the polyester resin is 3200-5300, the glass transition temperature is 58 ℃, and the acid value is 33-38 mgKOH/g.
The amino curing agent is substituted dicyandiamide.
The wetting auxiliary has the number average molecular weight of 3900-4500, the glass transition temperature of 53 ℃, the acid value of 26-33 mgKOH/g and the hydroxyl value of less than or equal to 5 mgKOH/g.
The surface modifier is titanate coupling agent.
The curing accelerator is 2-methylimidazole.
The filler is calcium carbonate and mica powder.
(2) Melting, mixing and extruding the pre-mixed A, B component raw materials by using a double-screw extruder respectively, wherein the temperature of an extruder I area is 100-105 ℃, the temperature of an extruder II area is 90-95 ℃, the extruder I area is an extruder melting and mixing section, and the extruder II area is an extruder feeding section.
(3) Tabletting, cooling and crushing the extruded A, B component material, and respectively carrying out fine crushing on the crushed material by using an ACM (acid-milling and mechanical grinding) until the median particle size of the powder is 28-30 mu m and 22-25 mu m.
(4) Premixing the A, B component powder according to the mass ratio of 95/5, adding the premixed A, B component powder into a granulator, and stirring and heating, bonding, granulating and the like at 50-80 ℃ to prepare granules;
(5) and (3) after the prepared particles are coarsely crushed, crushing and screening the particles by using a grinding mill until the median particle size is within the range of 35-40 mu m, thus obtaining sample powder.
Example 5
Preparing low-temperature curing type powder coating sample powder by the following steps:
(1) the following A, B component raw materials are respectively premixed according to the mass percentage;
the component A comprises the following raw materials in percentage by mass:
the component B comprises the following raw materials in percentage by mass:
the epoxy resin is alicyclic epoxy resin.
The polyester resin is prepared by condensing adipic acid, azelaic acid, neopentyl glycol, ethylene glycol, 2-methyl propylene glycol and the like, and has the number average molecular weight of 3700-6000, the glass transition temperature of 65 ℃ and the acid value of 33-38 mgKOH/g.
The amino curing agent is sebacic dihydrazide.
The wetting aid has a number average molecular weight of 3700-4500, a glass transition temperature of 42 ℃, an acid value of 29-33 mgKOH/g, and a hydroxyl value of less than or equal to 5 mgKOH/g.
The surface modifier is a silane coupling agent.
The curing accelerator is a cyclic amidine heterocyclic compound.
The filler is barite and mica powder.
(2) Respectively carrying out melt mixing extrusion on the premixed A, B component raw materials by using a double-screw extruder, wherein the temperature of an extruder I area is 100-105 ℃, and the temperature of an extruder II area is 90-95 ℃, wherein the extruder I area is an extruder melt mixing section, and the extruder II area is an extruder feeding section;
(3) tabletting, cooling and crushing the extruded A, B component material, and respectively carrying out fine crushing on the crushed material by using an ACM (acid-milling and mechanical grinding) mill until the median particle size of the powder is 20-25 μm and 18-20 μm;
(4) premixing the A, B component powder according to the mass ratio of 80/20, adding the premixed A, B component powder into a granulator, and stirring and heating, bonding, granulating and the like at 50-80 ℃ to prepare granules;
(5) and (3) coarsely crushing the prepared particles, and then crushing and screening the particles by using a grinding machine until the median particle size is within the range of 30-35 mu m to obtain sample powder.
Comparative example 1
Preparing low-temperature curing type powder coating sample powder by the following steps:
(1) premixing the following raw materials in percentage by mass;
(2) and carrying out melt mixing extrusion on the premixed raw materials by using a double-screw extruder, wherein the temperature of an extruder I area is 100-105 ℃, and the temperature of an extruder II area is 90-95 ℃, wherein the extruder I area is an extruder melt mixing section, and the extruder II area is an extruder feeding section.
(3) And tabletting, cooling and crushing the extruded material, and finely crushing the crushed material by using an ACM (acid-activated metal) mill until the median particle size of the powder is 30-35 mu m to obtain sample powder.
Comparative example 2
Preparing low-temperature curing type powder coating sample powder by the following steps:
(1) premixing the following raw materials in percentage by mass;
(2) and carrying out melt mixing extrusion on the premixed raw materials by using a double-screw extruder, wherein the temperature of an extruder I area is 100-105 ℃, and the temperature of an extruder II area is 90-95 ℃, wherein the extruder I area is an extruder melt mixing section, and the extruder II area is an extruder feeding section.
(3) And tabletting, cooling and crushing the extruded material, and finely crushing the crushed material by using an ACM (acid-activated metal) mill until the median particle size of the powder is 35-40 mu m to obtain sample powder.
The sample powders obtained in examples 2, 3, 4 and 5 and comparative examples 1 and 2 were coated by the following coating methods, respectively: coating the aluminum plate on which the aluminum plate is treated by a high-voltage electrostatic method or a fluidized bed method, wherein the thickness of the coating is 50-70 mu m, curing the aluminum plate by a hot baking oven at 130 ℃ for 10 minutes to obtain a coating sample plate, and performing related performance tests on the coating sample plate according to related standards (GB/T5237.4-2017 and GB/T2178.2-2008) respectively to obtain the following results:
as seen from the table, the storage stability of examples 2 to 5 is significantly superior to that of comparative examples 1 and 2, and other properties such as coating appearance, impact resistance and the like are equivalent to those of comparative examples 1 and 2, and the impact resistance, pencil hardness and cupping resistance of examples 3 and 5 are significantly superior to those of comparative examples 1 and 2. Therefore, the epoxy resin and the polyester resin or the amino curing agent are used as the component A, and the curing accelerator is dispersed into the polyester resin to be used as the component B, so that the storage stability of the powder product can be obviously improved.
In conclusion, the low-temperature curing powder coating product disclosed by the invention is good in storage stability and low in storage condition requirement, and simultaneously ensures better flatness and good physical properties of a coating film; the powder coating has low viscosity during low-temperature baking and still keeps high crosslinking degree, so that the leveling property and other physical properties of the finally produced coating film are good.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. If various changes or modifications to the present invention are made without departing from the spirit and scope of the present invention, it is intended that the present invention encompass such changes and modifications as fall within the scope of the claims and the equivalent technology of the present invention.
Claims (8)
1. The low-temperature curing powder coating is characterized in that the corresponding powder is prepared from the following A, B components in percentage by mass according to the formula, A, B component powder is mixed according to the mass ratio of 95/5-80/20, and the powder coating is prepared by a re-granulation technology:
the component A powder comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent;
the component B powder comprises the following raw materials in percentage by mass:
the sum of the mass percentages of the components is 100 percent;
the curing agent is polyester resin or amino curing agent, when the curing agent is polyester resin, the mass percent is 0-40%, and when the curing agent is amino curing agent, the mass percent is 0-5%; the wetting aid comprises semi-crystalline resin, the number average molecular weight of the semi-crystalline resin is 2500-4500, the glass transition temperature is above 30 ℃, the acid value is 20-40 mgKOH/g, and the hydroxyl value is less than or equal to 5 mgKOH/g;
the preparation method of the low-temperature curing powder coating comprises the following steps:
(1) premixing raw materials of the A, B component formula according to the corresponding mass percent, performing melt extrusion by adopting a double-screw extruder under the conditions that the temperature of a zone I is set to be 90-105 ℃, and the temperature of a zone II is set to be 85-95 ℃, performing tabletting cooling, and finally crushing and screening the raw materials to powder particles with proper particle size, wherein the median particle size of the powder of the component A is 20-30 mu m, and the median particle size of the powder of the component B is 15-30 mu m;
(2) premixing A, B component powder prepared in the step (1) according to a mass ratio of 95/5-80/20, adding the premixed A, B component powder into a granulator, and stirring, heating, bonding and granulating at 50-80 ℃ to prepare granules;
(3) and (3) coarsely crushing the particles prepared in the step (2), and then crushing and screening the particles to powder particles with the median particle size of 30-40 mu m by using a pulverizer to obtain the low-temperature curing powder coating product.
2. The low temperature curable powder coating according to claim 1, wherein the polyester resin comprises one or more of an amorphous carboxyl-terminated polyester resin and a semi-crystalline resin.
3. The low-temperature curable powder coating according to claim 2, wherein the amorphous carboxyl-terminated polyester resin has a number average molecular weight of 5000 to 10000, a glass transition temperature of 50 ℃ or higher, an acid value of 30 to 90mgKOH/g, the semi-crystalline resin has a number average molecular weight of 3000 to 6000, a glass transition temperature of 30 ℃ or higher, an acid value of 30 to 60mgKOH/g, and a hydroxyl value of 5mgKOH/g or less.
4. The low-temperature curing powder coating as claimed in claim 1, wherein the epoxy resin comprises one or more of bisphenol A epoxy resin, phenolic modified epoxy resin, and cycloaliphatic epoxy resin.
5. The low-temperature curing powder coating as claimed in claim 1, wherein the amino curing agent is a compound containing active hydrogen capable of reacting with epoxy group, and comprises one or more of dicyandiamide, substituted dicyandiamide, dicarboxylic dihydrazide compounds.
6. The low-temperature curable powder coating according to claim 1, wherein the surface modifier contains both an organophilic group and an organophilic group.
7. The low temperature curing powder coating of claim 1, wherein the other additives comprise one or more of leveling agents, gloss enhancers, degassing agents, antioxidants, scratch resistance agents, anti-yellowing agents, charge enhancers, light stabilizers, uv absorbers, antimicrobial agents, flow levelers, and gloss modifying additives.
8. The low-temperature curing powder coating as claimed in claim 1, wherein the curing agent accelerator is an imidazole or cyclic amidine heterocyclic compound.
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| CN112300667B (en) * | 2020-12-24 | 2021-05-11 | 艾勒可新材料(佛山)有限公司 | Powder coating and preparation method thereof |
| CN116515360A (en) * | 2023-02-24 | 2023-08-01 | 广东睿智环保科技股份有限公司 | Ultralow-temperature cured powder coating and preparation method thereof |
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| US20040176541A1 (en) * | 2003-02-21 | 2004-09-09 | Jackson Michael L. | Chlorine free and reduced chlorine content polymer and resin compositons for adhesion to plastics |
| CN101709164A (en) * | 2009-12-16 | 2010-05-19 | 漳州市万安实业有限公司 | Storable low temperature cured powder coating and preparation method thereof |
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| CN110964409A (en) * | 2019-11-28 | 2020-04-07 | 老虎表面技术新材料（清远）有限公司 | Low-temperature curing bamboo board powder coating and bamboo board coating applied by same |
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