CN113845789A - Super-weather-resistant powder coating with uniform surface texture and preparation method thereof - Google Patents
Super-weather-resistant powder coating with uniform surface texture and preparation method thereof Download PDFInfo
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- CN113845789A CN113845789A CN202110984712.1A CN202110984712A CN113845789A CN 113845789 A CN113845789 A CN 113845789A CN 202110984712 A CN202110984712 A CN 202110984712A CN 113845789 A CN113845789 A CN 113845789A
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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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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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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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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Abstract
The invention provides an ultra-weather-resistant powder coating with uniform surface texture, which comprises a substrate component and a wrinkle agent component, wherein the mass ratio of the wrinkle agent component to the substrate component is 3-7%; the substrate component comprises the following raw materials in parts by weight: 50-70 parts of epoxy resin, 7-11 parts of polyamide resin, 1-4 parts of polyester curing agent, 8-12 parts of diluent, 0.5-2.5 parts of aluminum tripolyphosphate, 1-3 parts of layered silicate, 0.5-1.5 parts of montmorillonite and 1-3 parts of monoalkoxy titanate coupling agent; the wrinkle agent comprises the following raw materials in parts by weight: 10-15 parts of acrylate copolymer, 25-35 parts of ethylene glycol ethyl ether acetate, 1-3 parts of curing agent, 30-50 parts of isopropyl acetate, 3-8 parts of maleic anhydride, 3-8 parts of dicyclopentadiene, 3-5 parts of silica powder and 1-3 parts of mica powder. The powder coating prepared by the method has stable and uniform surface texture and has good salt mist resistance, weather resistance and other properties.
Description
Technical Field
The invention relates to the technical field of powder coating preparation, in particular to an ultra-weather-resistant powder coating with uniform surface texture and a preparation method thereof.
Background
The powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler, auxiliary agent and the like. Unlike conventional solvent-based coatings and water-based coatings, the dispersion medium is not a solvent and water, but air. It has the characteristics of no solvent pollution, 100 percent film forming and low energy consumption. Powder coatings fall into two broad categories, thermoplastic and thermosetting. With the rapid development of science and technology, surface decoration is developing towards high decoration, high environmental protection and low consumption. The variety and range of art type coatings are also constantly being developed and changed, and new technologies and processes are constantly emerging. Clear and elegant and exquisite hammer paint, beautiful wrinkle paint, artistic metallic flashing paint, natural pearly paint with the name of chameleon and the like, and the racing car is dressed into a plurality of colors by the appearance with gorgeous patterns and novel patterns, thereby not only reflecting the excellent performance of the surface, but also beautifying the environment, bringing comfortable enjoyment to users, and being widely applied to the coating of shells of electric control cabinets, instruments, copiers, small motors and the like.
At present, the resins for wrinkle paint mainly comprise phenolic resin and alkyd resin, and the wrinkle paint prepared from the two resins needs to be added with tung oil. The tung oil needs to be refined at high temperature, the process requirement is very strict, and the tung oil is easy to glue without training workers. Meanwhile, the wrinkle paint prepared by using tung oil has a plurality of defects, such as easy yellowing of a film formed after coating. Epoxy resin is an important resin material, and is widely applied due to high adhesive force, excellent performance and convenient use. In the long-term use process, the epoxy resin is used as a decorative coating, the defects are exposed, the toughness and the impact resistance are poor, the epoxy resin is not suitable for being used on a flexible surface, and meanwhile, the change is small when the epoxy resin is changed into a wrinkle coating, and the decorative effect is difficult to achieve. The surface tension and density difference between a wrinkle agent and a coating film of some wrinkle coatings is too large, a Benard vortex formed in the coating film reaches a substrate to form a cavity, so that the coating film cannot completely cover the substrate, the protective effect of the coating on the substrate is greatly reduced, and the coating significance of powder coatings is lost.
Disclosure of Invention
The invention aims to provide a novel powder coating aiming at the defects of the wrinkle powder coating in the prior art, wherein the coating takes epoxy resin as a main material of a coating substrate and is modified to obtain a substrate component; acrylate copolymer and the like are used as wrinkle agent components; through proper proportioning, the surface tension difference between the two components is reasonable, the density difference is not large, the generation of vortexes is avoided, stable and uniform surface textures are formed, and the powder coating has good corrosion resistance and weather resistance.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the super-weather-resistant powder coating with uniform surface texture comprises a substrate component and a wrinkle agent component, wherein the mass ratio of the wrinkle agent component to the substrate component is 0.3-7%; the substrate component comprises the following raw materials in parts by weight: 50-70 parts of epoxy resin, 7-11 parts of polyamide resin, 1-4 parts of polyester curing agent, 8-12 parts of diluent, 0.5-2.5 parts of aluminum tripolyphosphate, 1-3 parts of layered silicate, 0.5-1.5 parts of montmorillonite and 1-3 parts of monoalkoxy titanate coupling agent; the wrinkle agent comprises the following raw materials in parts by weight: 10-15 parts of acrylate copolymer, 25-35 parts of ethylene glycol ethyl ether acetate, 1-3 parts of curing agent, 30-50 parts of isopropyl acetate, 3-8 parts of maleic anhydride, 3-8 parts of dicyclopentadiene, 3-5 parts of silica powder and 1-3 parts of mica powder.
Preferably, the epoxy resin is NPPN-631 epoxy resin with the epoxy equivalent of 170-180 g/eq; the diluent is a polyurethane modified epoxy resin diluent; the acrylate copolymer is a mixture consisting of tripropylene glycol diacrylate and trimethylolpropane triacrylate.
Preferably, the epoxy resin is NPPN-631 epoxy resin with the epoxy equivalent of 175 g/eq; the acrylate copolymer is a mixture of tripropylene glycol diacrylate and trimethylolpropane triacrylate in a mass ratio of 2-4: 1.
The preparation method of any one of the above super-weather-resistant powder coatings with uniform surface textures comprises the following steps:
s1: preparing a polyester curing agent;
s2: preparing a polyurethane modified epoxy resin diluent;
s3: premixing epoxy resin, polyamide resin, the curing agent obtained in the step S1, the diluent obtained in the step S2, aluminum tripolyphosphate, layered silicate, montmorillonite and a monoalkoxy titanate coupling agent in parts by weight; melt-extruding the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 120-130 ℃, and the temperature of a zone II of the extruder is 115-120 ℃; tabletting, cooling, crushing and screening to obtain a base component;
s4: premixing maleic anhydride, dicyclopentadiene, an acrylate copolymer, ethylene glycol ethyl ether acetate, the curing agent obtained in the step S1, isopropyl acetate, silica powder and mica powder according to parts by weight, and performing melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 140-160 ℃, and the temperature of a zone II of the extruder is 115-120 ℃; tabletting, cooling, crushing and screening to obtain a wrinkle agent component;
s5: the base component and the wrinkle agent component obtained in step S3 and step S4 are dry blended in proportion to obtain a powder coating.
Preferably, step S1 specifically includes: adding 10-20 parts of pentaerythritol, 20-40 parts of glutaric acid and 0.5-1 part of tetrabutyl titanate into a reaction kettle, heating to the temperature of 120-; heating to 150 ℃ and 170 ℃ for continuous reaction for 1-3h, and vacuumizing for 5-10min under the vacuum degree of-0.04 to-0.01 MPa when the esterification rate reaches more than 95 percent; after the reaction is finished, adding 5-10 parts of trimellitic anhydride, and continuously stirring at the temperature of 175-185 ℃ for reaction for 1-2 h; vacuumizing for 10-30min under the vacuum degree of-0.05 to-0.02 MPa; then the polyester curing agent is obtained through discharging, cooling and tabletting.
Preferably, step S2 specifically includes: and (2) measuring the hydroxyl value in the epoxy resin diluent containing hydroxyl, adding MDI into the epoxy resin diluent according to the stoichiometric ratio of complete reaction of isocyanate and the hydroxyl in the diluent under the nitrogen atmosphere, heating to 110-130 ℃ under continuous stirring, and continuously reacting for 0.5-1.5h to obtain the polyurethane modified epoxy resin diluent.
Preferably, the epoxy resin diluent is 669 epoxy diluent, which has a hydroxyl value in the range of 0.06-0.10; in the nitrogen atmosphere, MDI is added into the epoxy resin diluent according to the stoichiometric ratio of complete reaction of isocyanate and hydroxyl in the diluent, and the mixture is heated to 120 ℃ at the speed of 4 ℃/min under continuous stirring and continuously reacts for 1h to prepare the polyurethane modified epoxy resin diluent.
Preferably, in step S3, the temperature in zone I of the extruder is 120-130 ℃, and the temperature in zone II of the extruder is 115-120 ℃; the crushing and screening steps are as follows: crushing the crushed material to powder with the particle size of 40-80 microns, and sieving the powder by a rotary sieve with a 180-mesh sieve to obtain the powder coating.
Preferably, in step S4, the temperature in zone I of the extruder is 120-130 ℃, and the temperature in zone II of the extruder is 115-120 ℃; the crushing and screening steps are as follows: crushing the crushed material to powder with the particle size of 40-80 microns, and sieving the powder by a rotary sieve with a 180-mesh sieve to obtain the powder coating.
Preferably, the dry blending conditions in step S5 are: the mixing temperature is 60-65 ℃, the mixing speed is 1500-3000r/min, and the mixing time is 5-10 min.
Has the advantages that:
1. according to the invention, the substrate component and the wrinkle agent component are prepared by selecting proper components and proportion, uniform and stable surface wrinkles are finally obtained, and meanwhile, the powder coating has excellent performances such as flexibility, weather resistance and corrosion resistance.
2. The components of the substrate of the invention take epoxy resin and polyamide resin as main materials, and polyester curing agent, diluent, aluminum tripolyphosphate, layered silicate, montmorillonite and other components are used as auxiliary materials, so that the flexibility of the epoxy resin substrate is greatly improved, and the epoxy resin substrate has good hardness, impact resistance, salt mist resistance and aging resistance. Specifically, by modifying the original diluent, the isocyanic acid radical in the MDI and the hydroxyl-containing micromolecule in the original diluent act to extend the chain of a molecular chain, so that the molecular weight is increased, and the toughness is improved; adding a self-made polyester curing agent with good flexibility to further improve the flexibility; the phyllosilicate has a lamellar structure, and montmorillonite and aluminum triphosphate are stripped through phyllosilicate intercalation to obtain a flexible component with an inorganic multi-dimensional nano structure; under the synergistic effect of the components, the flexibility of the substrate component taking the epoxy resin as the main body is greatly improved. Under the action of MDI benzene ring and the existence of aluminium triphosphate, phyllosilicate and montmorillonite, the hardness, impact resistance, salt mist resistance, aging resistance and other properties of the substrate component are improved.
3. The wrinkle agent component of the invention is an acrylate copolymer main material compounded by tripropylene glycol diacrylate and trimethylolpropane triacrylate, which plays the roles of low viscosity, low curing shrinkage and high curing speed, and simultaneously substances such as ethylene glycol ethyl ether acetate, isopropyl acetate, maleic anhydride, dicyclopentadiene, silicon micropowder, mica powder and the like are added, so that the reasonable surface tension difference with the substrate component is kept, and the density is kept equivalent; in the spraying process, the wrinkle agent component can not be separated from the base powder component, the relative balance of the surface tension of a coating system is kept, the bottom exposure cavity is not easy to generate, and the coating has a complete covering effect on a substrate.
Detailed Description
The present invention is further illustrated below by reference to the following examples, which are intended to be illustrative of the invention only and are not intended to be limiting.
Example 1
S1: adding 10g of pentaerythritol, 20g of glutaric acid and 0.5g of tetrabutyl titanate into a reaction kettle, heating to 120 ℃, and continuously reacting for 30 min; heating to 150 ℃ and continuously reacting for 1h, and vacuumizing for 5min under the vacuum degree of-0.04 MPa when the esterification rate reaches more than 95%; after the reaction is finished, adding 5g of trimellitic anhydride, and continuously stirring at the temperature of 175 ℃ for reaction for 1 h; vacuumizing for 10min under the vacuum degree of-0.05 MPa; then the polyester curing agent is obtained through discharging, cooling and tabletting.
S2: determining 669 the hydroxyl number of the epoxy diluent; in the nitrogen atmosphere, MDI is added into the epoxy resin diluent according to the stoichiometric ratio of complete reaction of isocyanate and hydroxyl in the diluent, and the mixture is heated to 110 ℃ at the speed of 2 ℃/min under the condition of continuous stirring and continuously reacts for 0.5h to prepare the polyurethane modified epoxy resin diluent.
S3: premixing 50g of epoxy resin, 7g of polyamide resin, 6g of curing agent obtained in the step S1, 8g of diluent obtained in the step S2, 0.5g of aluminum tripolyphosphate, 1g of layered silicate, 0.5g of montmorillonite and 1g of monoalkoxy titanate coupling agent; carrying out melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 120 ℃, and the temperature of a zone II of the extruder is 115 ℃; tabletting, cooling, crushing to obtain particle size of 40 microns, and sieving and grading by using a 180-mesh 200-mesh rotary sieve to obtain a base component;
s4: premixing 3g of maleic anhydride, 3g of dicyclopentadiene, 10g of an acrylate copolymer (wherein the weight ratio of tripropylene glycol diacrylate to trimethylolpropane triacrylate is 1: 1), 25g of ethylene glycol ethyl ether acetate, 1g of the curing agent obtained in the step S1, 30g of isopropyl acetate, 3g of fine silicon powder and 1g of mica powder, and performing melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature in a first zone of the extruder is 140 ℃, and the temperature in a second zone of the extruder is 115 ℃; tabletting, cooling, crushing to obtain particle size of 40 microns, and sieving and grading by using a 180-mesh 200-mesh rotary sieve to obtain a wrinkle agent component;
s5: 100g of substrate component and 3g of wrinkle agent component are taken and mixed for 5min at the temperature of 60 ℃ and the speed of 1500r/min, and the powder coating is obtained.
Example 2
S1: adding 20g of pentaerythritol, 40g of glutaric acid and 1g of tetrabutyl titanate into a reaction kettle, heating to 140 ℃, and continuously reacting for 60 min; heating to 170 ℃ again, continuously reacting for 3h, and vacuumizing for 10min under the vacuum degree of-0.01 MPa when the esterification rate reaches more than 95%; after the reaction is finished, 10g of trimellitic anhydride is added, and the mixture is continuously stirred and reacted for 2 hours at the temperature of 185 ℃; vacuumizing for 30min under the vacuum degree of-0.02 MPa; then the polyester curing agent is obtained through discharging, cooling and tabletting.
S2: determining 669 the hydroxyl number of the epoxy diluent; in the nitrogen atmosphere, MDI is added into the epoxy resin diluent according to the stoichiometric ratio of complete reaction of isocyanate and hydroxyl in the diluent, and the mixture is heated to 130 ℃ at the speed of 5 ℃/min under the condition of continuous stirring and continuously reacts for 1.5h to prepare the polyurethane modified epoxy resin diluent.
S3: premixing 70g of epoxy resin, 11g of polyamide resin, 4g of the curing agent obtained in the step S1, 12g of the diluent obtained in the step S2, 2.5g of aluminum tripolyphosphate, 3g of layered silicate, 1.5g of montmorillonite and 3g of monoalkoxy titanate coupling agent; carrying out melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 130 ℃, and the temperature of a zone II of the extruder is 120 ℃; tabletting, cooling, crushing to 80 microns, and sieving and grading by using a 180-mesh 200-mesh rotary sieve to obtain a base component;
s4: premixing 8g of maleic anhydride, 8g of dicyclopentadiene, 15g of an acrylate copolymer (wherein the weight ratio of tripropylene glycol diacrylate to trimethylolpropane triacrylate is 4: 1), 35g of ethylene glycol ethyl ether acetate, 3g of the curing agent obtained in the step S1, 50g of isopropyl acetate, 5g of silicon micropowder and 3g of mica powder, and performing melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 160 ℃, and the temperature of a zone II of the extruder is 120 ℃; tabletting, cooling, crushing to 80 microns, and sieving and grading by using a 180-mesh 200-mesh rotary sieve to obtain a wrinkle agent component;
s5: 100g of substrate component and 7g of wrinkle agent component are taken and mixed for 10min at the temperature of 65 ℃ and the speed of 3000r/min, and the powder coating is obtained.
Example 3
S1: adding 15g of pentaerythritol, 30g of glutaric acid and 0.8g of tetrabutyl titanate into a reaction kettle, heating to 130 ℃, and continuously reacting for 45 min; heating to 160 ℃ for continuous reaction for 2.5h, and vacuumizing for 7min under the vacuum degree of-0.025 MPa when the esterification rate reaches more than 95%; after the reaction is finished, 8g of trimellitic anhydride is added, and the mixture is continuously stirred at the temperature of 180 ℃ for reaction for 1.5 h; vacuumizing for 25min under the vacuum degree of-0.035 MPa; then the polyester curing agent is obtained through discharging, cooling and tabletting.
S2: determining 669 the hydroxyl number of the epoxy diluent; in the nitrogen atmosphere, MDI is added into the epoxy resin diluent according to the stoichiometric ratio of complete reaction of isocyanate and hydroxyl in the diluent, and the mixture is heated to 120 ℃ at the speed of 4 ℃/min under continuous stirring and continuously reacts for 1h to prepare the polyurethane modified epoxy resin diluent.
S3: premixing 60g of epoxy resin, 9g of polyamide resin, 8g of curing agent obtained in the step S1, 3g of diluent obtained in the step S2, 2g of aluminum tripolyphosphate, 2g of layered silicate, 1g of montmorillonite and 2g of mono-alkoxy titanate coupling agent; carrying out melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 125 ℃, and the temperature of a zone II of the extruder is 120 ℃; tabletting, cooling, crushing to obtain particle size of 60 microns, and sieving and grading by using a 180-mesh 200-mesh rotary sieve to obtain a base component;
s4: premixing 6g of maleic anhydride, 5g of dicyclopentadiene, 12g of an acrylate copolymer (wherein the weight ratio of tripropylene glycol diacrylate to trimethylolpropane triacrylate is 2: 1), 30g of ethylene glycol ethyl ether acetate, 2g of the curing agent obtained in the step S1, 40g of isopropyl acetate, 4g of silica micropowder and 2g of mica powder, and performing melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 150 ℃, and the temperature of a zone II of the extruder is 120 ℃; tabletting, cooling, crushing to obtain particle size of 60 microns, and sieving and grading by using a 180-mesh 200-mesh rotary sieve to obtain a wrinkle agent component;
s5: 100g of substrate component and 5.5g of wrinkle agent component are taken and mixed for 7min at the temperature of 65 ℃ and the speed of 2000r/min, and the powder coating is obtained.
Comparative example 1
The difference from the example 1 is that the p-hydroxybenzene sulfonic acid is used as the curing agent, and other steps and conditions are not changed.
As is clear from comparison between comparative example 1 and example 1, since p-hydroxybenzenesulfonic acid was used as a curing agent, the molecular group thereof had no flexibility, and the flexibility of the resulting substrate component was lowered.
Comparative example 2
The difference from example 1 is that 669 epoxy diluent is used directly as diluent, and other steps and conditions are unchanged.
Comparing with comparative example 2 and example 1, it can be seen that, due to the lack of isocyanate group in MDI, it can not react with hydroxyl-containing small molecule in the original diluent, so that the molecular chain is extended, the molecular weight is increased, and the toughness of the substrate component is reduced.
Comparative example 3
The difference from example 1 is that no polyamide resin was added in step S3, and the other steps and conditions were not changed.
It is known from comparison between comparative example 3 and example 1 that, since the polyamide resin itself has characteristics of toughness, softness, strong binding force, salt spray resistance, aging resistance, etc., the corresponding properties of the base component are lowered in the absence of this component.
Comparative example 4
The difference from example 1 is that aluminum tripolyphosphate, layered silicate, and montmorillonite are not added in step S3, and other steps and conditions are not changed.
Comparing with comparative example 4 and example 1, it can be known that under the action of the three components, the phyllosilicate has a lamellar structure, so that the phyllosilicate intercalation strips montmorillonite and aluminium triphosphate to obtain the flexibility modifier with an inorganic multi-dimensional nano structure; when the adhesive agent is absent, the adhesive force, salt fog resistance, aging resistance and other properties of the substrate component are reduced.
Comparative example 5
The difference from example 1 is that only the acrylate copolymer and the curing agent were added in step S4, and other steps and conditions were not changed.
As can be seen from comparison example 5 and example 1, since the difference in density between the base component and the wrinkle agent component is large, individual swirling vortex eyes formed in the coating film reach the base material to form voids, so that the coating film cannot completely cover the base material.
Comparative example 6
The difference from example 1 is that the acrylate copolymer was replaced with trimethylolpropane triacrylate in step S4, and other steps and conditions were not changed.
Comparing with comparative example 6 and example 1, it is known that in the presence of only trimethylolpropane triacrylate, the viscosity, cure shrinkage, cure rate are affected, and thus the uniformity and stability of film formation are decreased.
The performance test method comprises the following steps:
the powder coating compositions prepared in each of the above examples and comparative examples were each sprayed onto a metal substrate and heated and cured to obtain a wrinkled texture coating on one side of the substrate. The method specifically comprises the following steps: the coating is coated on a heat-sensitive substrate by a high-voltage electrostatic method or a fluidized bed method, the curing temperature is 170-210 ℃, the curing time is 5-20 minutes, and the curing can be carried out by adopting a baking oven or infrared. After curing, the appearance of the various panels was observed and salt spray, aging resistance and other experiments were performed, and the results are shown in the following table.
The surface gloss, impact resistance, salt spray resistance, artificial accelerated aging, adhesive force and hardness performance test is carried out according to GB/T21776-2008 'Standard guide for detecting powder coating and coating thereof'; the bending test was according to GB/T6742-2007.
The above examples and comparative examples were tested and the results are as follows:
the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (10)
1. The super-weather-resistant powder coating with uniform surface texture is characterized by comprising a substrate component and a wrinkle agent component, wherein the mass ratio of the wrinkle agent component to the substrate component is 3-7%; the substrate component comprises the following raw materials in parts by weight: 50-70 parts of epoxy resin, 7-11 parts of polyamide resin, 1-4 parts of polyester curing agent, 8-12 parts of diluent, 0.5-2.5 parts of aluminum tripolyphosphate, 1-3 parts of layered silicate, 0.5-1.5 parts of montmorillonite and 1-3 parts of monoalkoxy titanate coupling agent; the wrinkle agent comprises the following raw materials in parts by weight: 10-15 parts of acrylate copolymer, 25-35 parts of ethylene glycol ethyl ether acetate, 1-3 parts of curing agent, 30-50 parts of isopropyl acetate, 3-8 parts of maleic anhydride, 3-8 parts of dicyclopentadiene, 3-5 parts of silica powder and 1-3 parts of mica powder.
2. The super weather-resistant powder coating with uniform surface texture as claimed in claim 1, wherein the epoxy resin is NPPN-631 epoxy resin with an epoxy equivalent of 170-180 g/eq; the diluent is a polyurethane modified epoxy resin diluent; the acrylate copolymer is a mixture consisting of tripropylene glycol diacrylate and trimethylolpropane triacrylate.
3. The super weather-resistant powder coating with uniform surface texture as claimed in claim 2, wherein the epoxy resin is NPPN-631 epoxy resin with an epoxy equivalent of 175 g/eq; the acrylate copolymer is a mixture of tripropylene glycol diacrylate and trimethylolpropane triacrylate in a mass ratio of 2-4: 1.
4. The preparation method of the super weather-resistant powder coating with uniform surface texture is characterized by comprising the following steps:
s1: preparing a polyester curing agent;
s2: preparing a polyurethane modified epoxy resin diluent;
s3: premixing epoxy resin, polyamide resin, the curing agent obtained in the step S1, the diluent obtained in the step S2, aluminum tripolyphosphate, layered silicate, montmorillonite and a monoalkoxy titanate coupling agent in parts by weight; melt-extruding the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 120-130 ℃, and the temperature of a zone II of the extruder is 115-120 ℃; tabletting, cooling, crushing and screening to obtain a base component;
s4: premixing maleic anhydride, dicyclopentadiene, an acrylate copolymer, ethylene glycol ethyl ether acetate, the curing agent obtained in the step S1, isopropyl acetate, silica powder and mica powder according to parts by weight, and performing melt extrusion on the premixed raw materials by using a screw extruder, wherein the temperature of a zone I of the extruder is 140-160 ℃, and the temperature of a zone II of the extruder is 115-120 ℃; tabletting, cooling, crushing and screening to obtain a wrinkle agent component;
s5: and (4) mixing the substrate component obtained in the step S3 and the wrinkle agent component obtained in the step S4 according to a ratio to obtain the super weather-resistant powder coating.
5. The method for preparing the super weather-resistant powder coating with uniform surface texture according to claim 4, wherein the step S1 is specifically as follows: adding 10-20 parts of pentaerythritol, 20-40 parts of glutaric acid and 0.5-1 part of tetrabutyl titanate into a reaction kettle, heating to the temperature of 120-; heating to 150 ℃ and 170 ℃ for continuous reaction for 1-3h, and vacuumizing for 5-10min under the vacuum degree of-0.04 to-0.01 MPa when the esterification rate reaches more than 95 percent; after the reaction is finished, adding 5-10 parts of trimellitic anhydride, and continuously stirring at the temperature of 175-185 ℃ for reaction for 1-2 h; vacuumizing for 10-30min under the vacuum degree of-0.05 to-0.02 MPa; then the polyester curing agent is obtained through discharging, cooling and tabletting.
6. The method for preparing the super weather-resistant powder coating with uniform surface texture according to claim 4, wherein the step S2 is specifically as follows: and (2) measuring the hydroxyl value in the epoxy resin diluent containing hydroxyl, adding MDI into the epoxy resin diluent according to the stoichiometric ratio of complete reaction of isocyanate and the hydroxyl in the diluent under the nitrogen atmosphere, heating to 110-130 ℃ under continuous stirring, and continuously reacting for 0.5-1.5h to obtain the polyurethane modified epoxy resin diluent.
7. The method of claim 6, wherein the epoxy resin diluent is 669 epoxy diluent, the hydroxyl number of which is in the range of 0.06-0.10; in the nitrogen atmosphere, MDI is added into the epoxy resin diluent according to the stoichiometric ratio of complete reaction of isocyanate and hydroxyl in the diluent, and the mixture is heated to 120 ℃ at the speed of 4 ℃/min under continuous stirring and continuously reacts for 1h to prepare the polyurethane modified epoxy resin diluent.
8. The method for preparing the super weather-resistant powder coating with uniform surface texture, according to the claim 4, wherein the temperature of the first zone of the extruder is 120 ℃ to 130 ℃ and the temperature of the second zone of the extruder is 115 ℃ to 120 ℃ in the step S3; the crushing and screening steps are as follows: crushing the crushed material to powder with the particle size of 40-80 microns, and sieving the powder by a rotary sieve with a 180-mesh sieve to obtain the powder coating.
9. The method for preparing the super weather-resistant powder coating with uniform surface texture, according to the claim 4, wherein the temperature of the first zone of the extruder is 120 ℃ to 130 ℃ and the temperature of the second zone of the extruder is 115 ℃ to 120 ℃ in the step S4; the crushing and screening steps are as follows: crushing the crushed material to powder with the particle size of 40-80 microns, and sieving the powder by a rotary sieve with a 180-mesh sieve to obtain the powder coating.
10. The method for preparing the super weather-resistant powder coating with uniform surface texture as claimed in claim 4, wherein the dry blending conditions in the step S5 are as follows: the mixing temperature is 60-65 ℃, the mixing speed is 1500-3000r/min, and the mixing time is 5-10 min.
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