CN107011774B - High-hardness powder coating composition and preparation method and application thereof - Google Patents
High-hardness powder coating composition and preparation method and application thereof Download PDFInfo
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- CN107011774B CN107011774B CN201710226750.4A CN201710226750A CN107011774B CN 107011774 B CN107011774 B CN 107011774B CN 201710226750 A CN201710226750 A CN 201710226750A CN 107011774 B CN107011774 B CN 107011774B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
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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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a high-hardness powder coating composition, a preparation method and application thereof, wherein the coating composition comprises the following components: polyester resin, triglycidyl isocyanurate curing agent, high-functional group epoxy resin, isocyanate dimer, polytetrafluoroethylene wax, auxiliary agent, pigment and filler, wherein the preparation method of the coating composition comprises the following steps: uniformly mixing polyester resin, triglycidyl isocyanurate curing agent, high-functional group epoxy resin, isocyanate dimer, polytetrafluoroethylene wax, auxiliary agent, pigment and filler, and sequentially carrying out melt extrusion, tabletting, cooling, coarse crushing, fine grinding and screening to obtain the high-hardness powder coating. The high-hardness powder coating disclosed by the invention has excellent hardness performance on a base material, the adhesion between the high-hardness powder coating and the base material is the best, the adhesion performance on the base material is good, the hardness performance is good, the weather resistance of a coating is not influenced, and the high-hardness powder coating has a good scratch-resistant effect.
Description
Technical Field
The invention belongs to the technical field of paint preparation, and particularly relates to a high-hardness powder paint composition, and a preparation method and application thereof.
Background
Sport equipment, outdoor building curtain, the outward appearance piece of outdoor article such as outdoor place guardrail board exposes in outdoor environment for a long time, receives external influence easily and causes the scraping, and then causes the scotch on film surface, both influences the pleasing to the eye of outward appearance piece, causes the destruction of coating again easily, and then causes the influence to the performance of outward appearance piece.
The method for preparing high-hardness products, particularly products capable of reaching 4H pencil hardness, in the powder coating industry generally comprises the following 3 conditions:
1. polyurethane system
The polyurethane is used, the crosslinking density of the system is extremely high, and the pencil hardness of 4H is easily achieved, but the method has the defect of high cost, and the cost of a polyurethane product is generally about 3-4 times that of a common polyester resin system; due to the excessively high crosslinking density of the system, the flexibility of the coating is poor and can only reach the bending performance of 3-4 mm generally; furthermore, the poor compatibility of polyurethane systems with polyester systems or polyester-epoxy systems leads to the use of polyurethane systems in both production and construction sites being cumbersome.
2. Acrylic acid system
The acrylic acid system is equivalent to the polyurethane system in terms of coating hardness, but is more expensive than the polyurethane system, is the most expensive system in the existing powder coating, and has strong pollution to products of other systems, and needs to be produced and used in a separate production workshop and a spraying workshop. Therefore, the system is generally only used in automobile products, and has few application cases in other industries.
3. Ordinary polyester system
This system is the most advocated at present, cheap and the most commonly used system in powder industry. However, because of the low crosslink density of polyester systems, there is no product on the market that can completely match polyurethane or acrylic systems, and even if there is a manufacturer's promise that the product can reach 4H, the index is generally evaluated as to whether the coating is scratched or not, rather than whether the coating is scratched or not. The reason why the scratch rating of the coating cannot be evaluated is that the resin system migrates to the surface of the coating during curing, resulting in less than theoretical amount of the hardening filler at the outermost surface of the coating, and the hardness of the coating surface cannot be compared with that of the acrylic system or the polyurethane system because these systems enhance the hardness by adding the filler completely.
In view of the above, there is a need to provide a high hardness powder coating to overcome the deficiencies of the prior art.
Disclosure of Invention
In order to overcome the drawbacks of the prior art, it is an object of the present invention to provide a high hardness powder coating composition.
It is another object of the present invention to provide a method for preparing the high hardness powder coating composition.
It is a further object of the present invention to provide a use of the high hardness powder coating composition.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
one aspect of the present invention provides a high hardness powder coating composition comprising the following components in parts by weight:
wherein the functionality of the high-functional epoxy resin is not less than 15.
Preferably, the acid value of the polyester resin is 40 to 45 mgKOH/g.
Preferably, the glass transition temperature of the polyester resin is 60-70 ℃.
Preferably, the filler is selected from at least one of silica, alumina, quartz powder, and melamine powder.
More preferably, the filler is a mixture of silica and alumina.
Preferably, the triglycidyl isocyanurate curing agent has the epoxy equivalent of 100-110 g/mol.
Preferably, the epoxy equivalent of the high-functional group epoxy resin is 140-165 g/mol, and the glass transition temperature is 200-205 ℃.
Preferably, the isocyanate content of the isocyanate dimer is 14.7-15.7 parts by weight.
Preferably, the polytetrafluoroethylene wax has a purity of not less than 99 parts by weight.
Preferably, the auxiliary agent comprises the following components in parts by weight:
0.8-1.2 parts of a leveling agent;
0.5-1.0 part of brightener;
0.2-0.4 parts of benzoin.
Preferably, the pigment is one or two of titanium dioxide and carbon black.
By the formula design, the coating pencil hardness can reach the level of 4H without scratching. Compared with a polyurethane system and an acrylic acid system, the whole polyester resin system has low crosslinking density, so the bending resistance is obviously good, the compatibility with general products is good, and special production and coating environments are not used; and the product has the same price with the common polyester resin system, and is far lower than the price of polyurethane and acrylic acid systems.
The polyester system in the invention has hardness reaching 4H, and is comparable to the hardness of acrylic system and polyurethane system, and mainly has the following three reasons:
first, higher crosslink density:
in order to ensure higher crosslinking density, the invention designs the following scheme:
1. use of high acid number polyester resin: the acid value of the polyester resin is 40-45 mgKOH/g, and the ratio of the polyester resin to the triglycidyl isocyanurate curing agent is 92:8 (the acid value of the polyester resin is 45mgKOH/g, the carboxyl equivalent is 1246, the epoxy equivalent of the triglycidyl isocyanurate curing agent is 108, and the polyester resin dosage/triglycidyl isocyanurate dosage is carboxyl equivalent/epoxy equivalent 1246/108-92/8.), so that the crosslinking density of the polyester resin is higher than that of the conventional polyester resin. Different from polyester with an acid value of 32-38 mgKOH/g or polyester with an acid value of 28-32 mgKOH/g, the ratio of the polyester to triglycidyl isocyanurate curing agent is 93:7 or 94:6 respectively. In order to further increase the crosslinking density of the coating, the industry personnel can also use a polyester system with an acid value of 48-53 mgKOH/g, which is not described herein.
2. It is also critical to add a high functionality epoxy resin with functionality not less than 15, such high functionality epoxy resin reacts with part of the carboxyl groups of the polyester resin to supplement and reinforce the crosslink density of the polyester and TGIC, the content is controlled to be within 2.0 weight parts, and too much affects the weather resistance.
3. The addition of an isocyanate dimer is also necessary, and this material does not affect the weathering performance of the system and reacts with the excess hydroxyl groups in the polyester system or TGIC to further enhance the crosslink density of the system.
Secondly, the use of a stiffening filler:
the preferred stiffening fillers are typically silica/alumina mixtures, which have a Mohs hardness of 5.0 to 6.0, typically around 5.5, and this is most advantageous. If there is no silica/alumina mixture, silica or quartz powder or powdered alumina can be used, but the three mixtures without silica/alumina are more effective.
Thirdly, adding polytetrafluoroethylene wax:
the polytetrafluoroethylene wax has high hardness and good smoothness, and is very helpful to the hardening effect and the friction resistance effect of the coating after being added.
Another aspect of the present invention provides a method for preparing a high hardness powder coating composition, comprising the steps of:
uniformly mixing polyester resin, triglycidyl isocyanurate curing agent, high-functional group epoxy resin, isocyanate dimer, polytetrafluoroethylene wax, auxiliary agent, pigment and filler, and sequentially carrying out melt extrusion, tabletting, cooling, coarse crushing, fine grinding and screening to obtain the high-hardness powder coating.
The temperature of the melt extrusion is 95-105 ℃.
The particle size of the high-hardness powder coating is 30-45 ℃.
In a further aspect of the present invention, there is provided a method for forming a cured varnish coating from a high hardness powder coating composition, comprising the steps of:
and (3) after surface treatment is carried out on the appearance piece, spraying the high-hardness powder coating composition, baking at 180-210 ℃, and then cooling to obtain a coating.
Due to the adoption of the technical scheme, the invention has the following advantages and beneficial effects:
1. compared with the common conventional system, the formula of the high-hardness powder coating is only higher in resin acid value and is not adjusted from a large variety, and the introduced high-energy-group epoxy resin and isocyanate dimer do not have adverse effect on the conventional powder; so the formula management is simple;
2. the high-hardness powder coating disclosed by the invention has the advantages that the formula is similar to that of conventional powder, so that the adjustment is not needed in the production process, the compatibility of the powder coating disclosed by the invention and the common conventional powder is good, the conventional powder is not polluted, and a separate production workshop is not needed; polyurethane or acrylic resin systems, especially acrylic systems, require a separate production plant to produce due to contamination of conventional powder systems;
3. the high-hardness powder coating has a good scratch-resistant effect, and the problem of poor performance of the coating caused by the scratch of the coating by external force is avoided;
4. compared with polyurethane or acrylic acid systems, the high-hardness powder coating has obvious advantages in impact performance, and can reach the impact strength of 50 kg-cm; polyurethane or acrylic systems generally crack severely at 30kg cm;
5. compared with a polyurethane or acrylic acid system, the high-hardness powder coating has obvious advantages in bending performance, can be bent by 2mm and basically has no crack; polyurethane or acrylic systems typically crack severely at 2 mm;
6. the high-hardness powder coating can be carried out on the basis of the existing spraying process of outdoor powder products, and the existing spraying process is not changed; when the polyurethane or acrylic acid system is applied, common conventional powder is very easy to pollute due to the particularity of the system, and a separate spray room is needed.
The specific implementation mode is as follows:
the present invention is described in detail below by way of examples, it should be noted that the examples are only for the purpose of further illustration, and are not to be construed as limiting the scope of the present invention, and that the skilled person in the art may make many insubstantial modifications and adaptations of the present invention based on the above disclosure.
Raw material information: the following lists information on the raw materials used in the examples of the present invention. For convenience of description, trade names of raw materials or their corresponding name abbreviations are used in the examples. The molecular weight of the resin or polymer is obtained by gel permeation chromatography measurement.
(i) The polyester resin in the embodiment of the invention is NH3295 of Guangzhou Optimus materials science and technology Limited, YE8700 of Guangdong Yinyang resins Limited, FL2016 of cigarette Tai Fenglin New materials Limited;
(ii) the triglycidyl isocyanurate curing agent in the embodiment of the invention is TGIC (triglycidyl isocyanurate) of Huahui fine chemical engineering Co., Ltd, in Huangshan city, and the professional can select TGIC of other manufacturers;
(iii) the epoxy resin in the embodiment of the invention is double-bond chemical 4315 CE;
(iv) the isocyanate dimer in the examples of the present invention was isocyanate dimer B1530 (powder) of esoxim (Evonik degussa);
(v) the polytetrafluoroethylene wax in the embodiment of the invention is SST-3D of American Trifoil company, or PTFE0101 of Nanjing Tianshi New Material science and technology Limited;
(vi) the leveling agent in the embodiment of the invention is GLP588 of Ningbo south sea chemical Co., Ltd, and the personnel in the industry can select other manufacturers and models; the brightener is 701 of Ningbo south sea chemical Co., Ltd, and other manufacturers and models can be selected by personnel in the industry; the benzoin system is named as 2-hydroxy-1, 2-diphenylethanone, is Ningbo south sea chemical Co., Ltd, and the personnel in the industry can select other manufacturers and models; the desiccant is alumina C (AEROSIL Alu C) of Evonik degussa, and the industry personnel can select other manufacturers and models; the pigment is at least one of titanium dioxide or carbon black, titanium dioxide and carbon black or other pigments, and personnel in the industry can select the pigment according to the needs;
(vii) the filler in the embodiment of the invention is CP30 of Chongqing brocade silicon material development company Limited, and the raw material is a compound of silicon dioxide and aluminum oxide.
Example 1
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank through high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, performing melt extrusion at 95-105 ℃, pressing the raw materials into tablets through a cooling roller, cooling the tablets at natural temperature, coarsely crushing the tablets through a crusher, cooling the obtained materials, finely crushing the materials through the crusher, sieving the materials through a 180-mesh sieve, naturally cooling the materials through the sieving of the 180-mesh sieve, and finally obtaining the high-hardness powder coating with uniform particle size.
Degreasing (or performing other pre-treatment such as silane treatment) on the substrate, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 180-210 ℃ for 10-20 minutes (min); and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
Example 2
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank by high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, carrying out melt extrusion at 95-105 ℃, pressing the raw materials into tablets by a cooling roller, cooling the tablets at natural temperature, carrying out coarse crushing on the tablets by a crusher, cooling the obtained materials, carrying out fine crushing by the crusher, sieving by a 180-mesh sieve, and naturally cooling by sieving by the 180-mesh sieve to finally obtain the high-hardness powder coating with uniform particle size.
Deoiling (or performing other pretreatment such as silane treatment) on the aluminum veneer, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 1980-; and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
Example 3
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank by high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, carrying out melt extrusion at 95-105 ℃, pressing the raw materials into tablets by a cooling roller, cooling the tablets at natural temperature, carrying out coarse crushing on the tablets by a crusher, cooling the obtained materials, carrying out fine crushing by the crusher, sieving by a 180-mesh sieve, and naturally cooling by sieving by the 180-mesh sieve to finally obtain the high-hardness powder coating with uniform particle size.
Degreasing (or performing other pre-treatments such as silane treatment) on the substrate, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 180 ℃ and 210 ℃ for 10-20 min; and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
Example 4
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank by high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, carrying out melt extrusion at 95-105 ℃, pressing the raw materials into tablets by a cooling roller, cooling the tablets at natural temperature, carrying out coarse crushing on the tablets by a crusher, cooling the obtained materials, carrying out fine crushing by the crusher, sieving by a 180-mesh sieve, and naturally cooling by sieving by the 180-mesh sieve to finally obtain the high-hardness powder coating with uniform particle size.
Degreasing (or performing other pre-treatments such as silane treatment) on the substrate, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 180 ℃ and 210 ℃ for 10-20 min; and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
Example 5
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank by high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, carrying out melt extrusion at 95-105 ℃, pressing the raw materials into tablets by a cooling roller, cooling the tablets at natural temperature, carrying out coarse crushing on the tablets by a crusher, cooling the obtained materials, carrying out fine crushing by the crusher, sieving by a 180-mesh sieve, and naturally cooling by sieving by the 180-mesh sieve to finally obtain the high-hardness powder coating with uniform particle size.
Degreasing (or performing other pre-treatments such as silane treatment) on the substrate, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 180 ℃ and 210 ℃ for 10-20 min; and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
Example 6
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank by high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, carrying out melt extrusion at 95-105 ℃, pressing the raw materials into tablets by a cooling roller, cooling the tablets at natural temperature, carrying out coarse crushing on the tablets by a crusher, cooling the obtained materials, carrying out fine crushing by the crusher, sieving by a 180-mesh sieve, and naturally cooling by sieving by the 180-mesh sieve to finally obtain the high-hardness powder coating with uniform particle size.
Degreasing (or performing other pre-treatments such as silane treatment) on the substrate, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 180 ℃ and 210 ℃ for 10-20 min; and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
Example 7
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank by high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, carrying out melt extrusion at 95-105 ℃, pressing the raw materials into tablets by a cooling roller, cooling the tablets at natural temperature, carrying out coarse crushing on the tablets by a crusher, cooling the obtained materials, carrying out fine crushing by the crusher, sieving by a 180-mesh sieve, and naturally cooling by sieving by the 180-mesh sieve to finally obtain the high-hardness powder coating with uniform particle size.
Degreasing (or performing other pre-treatments such as silane treatment) on the substrate, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 180 ℃ and 210 ℃ for 10-20 min; and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
Example 8
The high-hardness powder coating provided by the embodiment comprises the following components in parts by weight:
firstly, accurately weighing raw materials according to the formula composition of the high-hardness powder coating components, uniformly mixing the raw materials in a premixing tank by high-speed rotation (premixing time is 5-10 minutes), then putting the uniformly mixed raw materials into a double-screw extruder at a constant speed, carrying out melt extrusion at 95-105 ℃, pressing the raw materials into tablets by a cooling roller, cooling the tablets at natural temperature, carrying out coarse crushing on the tablets by a crusher, cooling the obtained materials, carrying out fine crushing by the crusher, sieving by a 180-mesh sieve, and naturally cooling by sieving by the 180-mesh sieve to finally obtain the high-hardness powder coating with uniform particle size.
Degreasing (or performing other pre-treatments such as silane treatment) on the substrate, spraying in a dust-free room, and then baking in a baking channel at the baking temperature of 180 ℃ and 210 ℃ for 10-20 min; and naturally cooling after the coating is fully solidified.
Hardness tests are carried out on the coating, and the highest pencil hardness of 4H (GB/T63792006) can be achieved, which indicates that the coating has excellent hardness performance.
In all of the above examples, the coating achieved the following criteria:
remarking: the wear resistance test conditions are that the wear resistance instrument bears the weight: 500g/wheel
Comparative example 1
The powder coating comprises the following components in parts by weight:
this comparative example 1 used 93:7, no 92:8 polyester resin with high curing ratio, no epoxy resin with high functional group and isocyanate dimer, no polytetrafluoroethylene wax and only hardening filler are added, so that the coating cannot reach 4H pencil hardness and the wear resistance is poor.
The results of the performance test of the powder coating of comparative example 1 are as follows:
comparative example 2
The powder coating comprises the following components in parts by weight:
this comparative example 2 used 94:6, polyester resin with high curing ratio is not used, epoxy resin with high functional groups and isocyanate dimer are not used, only hardening filler and polytetrafluoroethylene wax are added, the outermost surface of the coating can only reach 2H, the pencil hardness cannot reach 4H, and the wear-resisting property is not ideal.
The results of the performance test of the powder coating of comparative example 2 are as follows:
comparative example 3
The powder coating comprises the following components in parts by weight:
| components | Specific model | Parts by weight |
| Polyurethane resin | Uralac P1580 | 24.5 |
| Polyester resin | REAFREE 17091 | 5 |
| Isocyanate dimer | B1530 | 29.5 |
| Auxiliary agent | 588+701+ Benzoinum | 2.3 |
| Carbon black/titanium dioxide and other pigments | HB2185 | 5.5 |
| Barium sulfate filler | W44 | 33.2 |
This comparative example 3 uses a polyurethane resin system with a high crosslinking density, but the formulation is more than twice as expensive as the formulation used in the present patent, and the impact properties and bending properties of the system are greatly affected due to the excessively high crosslinking density of the formulated system.
The results of the performance test of the powder coating of comparative example 3 are as follows:
the high-hardness powder coating disclosed by the invention is good in compatibility with common conventional powder, cannot pollute the conventional powder, and does not need a separate production workshop; meanwhile, the coating has a good scratch-resistant effect, and the problem of poor performance of the coating caused by the scratch of the coating due to external force is avoided. Compared with a polyurethane or acrylic acid system, the high-hardness powder coating has obvious advantages in impact performance, and can reach the impact strength of 50 kg-cm; the bending property of the material has obvious advantages, and the material can be bent by 2mm and basically has no cracks; the high-hardness powder coating can be carried out on the basis of the existing spraying process of outdoor powder products, and the existing spraying process is not changed.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the invention and are not to be construed as limiting the embodiments of the present invention, and that various other changes and modifications may be made by those skilled in the art based on the above description. All documents mentioned in this application are incorporated by reference into this application as if each were individually incorporated by reference.
Claims (12)
1. A high hardness powder coating composition characterized by: the paint comprises the following components in parts by weight:
the functionality of the high-functional group epoxy resin is not less than 15, and the epoxy equivalent of the high-functional group epoxy resin is 140-165 g/mol;
the isocyanate dimer reacts with redundant hydroxyl groups in a polyester system or TGIC to further enhance the crosslinking density of the system;
the acid value of the polyester resin is 40-45 mgKOH/g;
the isocyanate content of the isocyanate dimer is 14.7-15.7 parts by weight;
the hardening filler is selected from at least one of silicon dioxide, aluminum oxide, quartz powder and melamine powder;
the epoxy equivalent of the triglycidyl isocyanurate curing agent is 100-110 g/mol.
2. The high hardness powder coating composition according to claim 1, characterized in that: the glass transition temperature (Tg) of the polyester resin is 60-70 ℃.
3. The high hardness powder coating composition according to claim 2, characterized in that: the hardening filler is a mixture of silica and alumina.
4. The high hardness powder coating composition according to claim 1, characterized in that: the glass transition temperature of the high-functional group epoxy resin is 200-205 ℃.
5. The high hardness powder coating composition according to claim 1, characterized in that: the purity of the polytetrafluoroethylene wax is not less than 99%.
6. The high hardness powder coating composition according to claim 1, characterized in that: the auxiliary agent comprises the following components in parts by weight:
0.8-1.2 parts of a leveling agent;
0.5-1.0 part of brightener;
0.2-0.4 parts of benzoin.
7. The high hardness powder coating composition according to claim 1, wherein the pigment is at least one of titanium dioxide and carbon black.
8. A method for preparing a high hardness powder coating composition according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
uniformly mixing polyester resin, triglycidyl isocyanurate curing agent, high-functional group epoxy resin, isocyanate dimer, polytetrafluoroethylene wax, auxiliary agent, pigment and hardening filler, and sequentially carrying out melt extrusion, tabletting, cooling, coarse crushing, fine grinding and sieving to obtain the high-hardness powder coating composition.
9. The method for preparing a high-hardness powder coating composition according to claim 8, wherein: the temperature of the melt extrusion is 95-105 ℃.
10. The method for preparing a high-hardness powder coating composition according to claim 8, wherein: the particle size of the high-hardness powder coating composition is 30-45 um.
11. Use of a high hardness powder coating composition according to any one of claims 1 to 7 in the spraying of an appearance piece.
12. Use of a high hardness powder coating composition according to claim 11 in the spray coating of an appearance piece, characterized in that: the method comprises the following steps:
and (3) after surface treatment is carried out on the appearance piece, spraying the high-hardness powder coating composition, baking at 180-210 ℃, and then cooling to obtain a coating.
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| CN107418395B (en) * | 2017-09-15 | 2022-02-08 | 立邦涂料（天津）有限公司 | Transparent polyester type powder coating, preparation method and application thereof |
| CN109517493A (en) * | 2017-09-16 | 2019-03-26 | 立邦涂料（天津）有限公司 | A kind of high rigidity compound resin-epoxy powder coating composition, preparation method and applications |
| CN109517494B (en) * | 2017-09-17 | 2022-08-12 | 立邦涂料（天津）有限公司 | High-hardness epoxy-polyester powder coating composition, preparation method and application thereof |
| CN111378298A (en) * | 2018-12-27 | 2020-07-07 | 苏州锦艺新材料科技有限公司 | Powder material, preparation method thereof and powder coating |
| CN111100273A (en) * | 2019-12-31 | 2020-05-05 | 江苏睿浦树脂科技有限公司 | Polyester resin for high-hardness scratch-resistant powder coating and preparation method thereof |
| CN111704853A (en) * | 2020-07-07 | 2020-09-25 | 江南载福粉末涂料（张家港）有限公司 | Ultrahigh-hardness scratch-resistant powder coating |
| CN114539889B (en) * | 2020-11-11 | 2023-06-13 | 青岛美尔塑料粉末有限公司 | High-gloss weather-resistant high-temperature-resistant detergent powder coating and preparation method and application thereof |
| CN112724805B (en) * | 2020-12-30 | 2022-08-19 | 广东华江粉末科技有限公司 | Anti-slip powder coating and preparation method thereof |
| CN117070137B (en) * | 2023-10-18 | 2024-06-21 | 佛山市南海嘉多彩粉末涂料有限公司 | Anti-fingerprint powder coating composition and preparation method thereof |
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| DE19935539A1 (en) * | 1999-07-30 | 2001-02-08 | Herberts Gmbh & Co Kg | Process for producing weather-stable powder coatings |
| CN1908096A (en) * | 2006-08-02 | 2007-02-07 | 江苏兰陵化工集团有限公司 | Electrostatic spraying powder coating for magnetic wire and enameled wire and preparation technique thereof |
| DE102008007386A1 (en) * | 2008-02-01 | 2009-08-06 | Evonik Degussa Gmbh | Process for the preparation of highly reactive uretdione group-containing polyurethane compositions in dry blend |
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