CN112280444A - Polyester transparent powder coating and preparation method thereof - Google Patents
Polyester transparent powder coating and preparation method thereof Download PDFInfo
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- CN112280444A CN112280444A CN202011258619.4A CN202011258619A CN112280444A CN 112280444 A CN112280444 A CN 112280444A CN 202011258619 A CN202011258619 A CN 202011258619A CN 112280444 A CN112280444 A CN 112280444A
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- 238000000576 coating method Methods 0.000 title claims abstract description 81
- 239000011248 coating agent Substances 0.000 title claims abstract description 74
- 239000000843 powder Substances 0.000 title claims abstract description 67
- 229920000728 polyester Polymers 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 35
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229920001225 polyester resin Polymers 0.000 claims abstract description 28
- 239000004645 polyester resin Substances 0.000 claims abstract description 28
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 17
- -1 trihydroxyethyl isocyanurate Chemical compound 0.000 claims abstract description 15
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000011037 adipic acid Nutrition 0.000 claims abstract description 13
- 239000001361 adipic acid Substances 0.000 claims abstract description 13
- OWBTYPJTUOEWEK-UHFFFAOYSA-N butane-2,3-diol Chemical compound CC(O)C(C)O OWBTYPJTUOEWEK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims abstract description 12
- 238000001723 curing Methods 0.000 claims description 24
- 239000004611 light stabiliser Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 15
- 229920003180 amino resin Polymers 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- DSKYSDCYIODJPC-UHFFFAOYSA-N 2-butyl-2-ethylpropane-1,3-diol Chemical compound CCCCC(CC)(CO)CO DSKYSDCYIODJPC-UHFFFAOYSA-N 0.000 claims description 7
- 239000012948 isocyanate Substances 0.000 claims description 7
- 150000002513 isocyanates Chemical class 0.000 claims description 7
- YSWBFLWKAIRHEI-UHFFFAOYSA-N 4,5-dimethyl-1h-imidazole Chemical compound CC=1N=CNC=1C YSWBFLWKAIRHEI-UHFFFAOYSA-N 0.000 claims description 6
- 125000001453 quaternary ammonium group Chemical group 0.000 claims description 6
- HGMBMQCMVMTPGS-UHFFFAOYSA-N 4-(methylsulfamoyl)benzenesulfonic acid Chemical compound CNS(=O)(=O)c1ccc(cc1)S(O)(=O)=O HGMBMQCMVMTPGS-UHFFFAOYSA-N 0.000 claims description 5
- 150000001412 amines Chemical class 0.000 claims description 5
- 239000003963 antioxidant agent Substances 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000003860 storage Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000009257 reactivity Effects 0.000 description 7
- 238000013035 low temperature curing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical class C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a polyester transparent powder coating and a preparation method thereof, wherein the polyester transparent powder coating comprises the following components in parts by weight: 50-60 parts of hydroxyl-terminated polyester resin, 4-6 parts of trimethylolpropane, 2-4 parts of trihydroxyethyl isocyanurate, 5-7 parts of adipic acid, 11-17 parts of methyl propylene glycol, 6-10 parts of isophthalic acid, 0.5-1.2 parts of an antifrost agent and 0.5-5 parts of an auxiliary agent, can be self-dried and fixed at normal temperature, has higher reaction activity and good storage stability at lower temperature, does not appear a precured field in high-temperature extrusion, and is required to have good leveling property, mechanical property and weather resistance without partial frosting.
Description
Technical Field
The invention relates to the technical field of powder coatings, in particular to a polyester transparent powder coating and a preparation method thereof.
Background
The powder coating is 100% solid coating, basically has no VOC emission, the sprayed powder can be recycled during coating, the powder coating has the characteristics of resource saving, energy saving, no pollution, high labor productivity, convenience for realizing automatic coating and the like, and is generally recognized as 4E type coating with high production efficiency, excellent coating performance, ecological protection and economy.
Due to the characteristics of powder coatings, the development and production of powder coatings have been rapidly developed in recent years, and with the research and development of powder coatings and coating technologies, the variety of powder coatings is increasingly improved, for example, transparent powder coatings are gradually replacing solvent-based varnishes for finishing the surfaces of automobiles and the like, and the current powder coatings have the defects of higher baking fixed line temperature and longer baking time. The higher baking temperature brings great difficulty to the coating of thermosensitive substrates such as plastics, wood, soldering tin metal parts and the like, limits the expansion of the application range of the powder coating, has longer baking time, longer production period of products and low production efficiency. The curing temperature of the low-temperature curing powder coating is generally 140-16 ℃, and the development of the low-temperature fixing powder coating has very important significance in terms of saving energy, reducing cost, improving efficiency and expanding the application range of powder. The low-temperature curing of the powder coating is realized with great technical difficulty, the curing process of the powder coating is a low-temperature latent curing system, and the stability of the powder coating in the melting, extruding and storing processes is influenced if the chemical reaction activity ratio of the system at a lower temperature is higher; the polyester resin for the powder coating generally has a high softening point, and the melt viscosity of the polyester resin is low at low temperature, so that the storage stability of the powder coating is poor, the powder coating is usually stored at low temperature, inconvenience is brought to use, and meanwhile, when the polyester resin is baked and solidified at low temperature for a long time, a layer of frosting substance is separated out on the surface of the powder coating, the luster of the coating is reduced, and the appearance of the coating is influenced.
For example, the coating of the polyester transparent powder coating disclosed in CN108300177A and CN108034337A needs to be improved in transparency and leveling property, film coating property, anti-blooming property, boiling resistance and weather resistance.
Based on the above, the invention designs a polyester transparent powder coating and a preparation method thereof, so as to solve the above-mentioned problems.
Disclosure of Invention
The object of the present invention is to provide a transparent powder coating of polyester and a method for preparing the same, which solves the above mentioned problems.
In order to achieve the purpose, the invention provides the following technical scheme: a polyester transparent powder coating comprising the following components by weight:
50-60 parts of hydroxyl-terminated polyester resin, 4-6 parts of trimethylolpropane, 2-4 parts of trihydroxyethyl isocyanurate, 5-7 parts of adipic acid, 11-17 parts of methyl propylene glycol, 6-10 parts of isophthalic acid, 0.5-1.2 parts of antifrost and 0.5-5 parts of auxiliary agent.
Preferably, the antifrost agent adopts 2-butyl-2-ethyl-1, 3-propylene glycol.
Preferably, the auxiliary agents include accelerators, light stabilizers, relaxers, curing agents and antioxidants.
Preferably, the accelerant is one of quaternary ammonium bromide salt and N-methyl sulfo-p-benzenesulfonamide, the quaternary ammonium bromide salt is used as the accelerant, yellowing of the traditional imidazole accelerant can be avoided, and the color of a coating made of the polyester transparent powder coating cannot be changed.
Preferably, the curing agent is a mixture of isocyanate, amino resin and dimethylimidazole, the weight ratio of the isocyanate to the amino resin is 1:1:0.5, the isocyanate and the amino resin in the curing agent can achieve the effect of fast curing, and the dimethylimidazole plays a role of catalysis, so that the rapid curing can be achieved under the low-temperature condition, and the curing speed is 200 ℃/3 min.
Preferably, the light stabilizer is a hindered amine light stabilizer, and is a stabilizing auxiliary agent for inhibiting photo-oxidative degradation of polymer resin and improving weather resistance of the powder coating.
A method for preparing a polyester transparent powder coating, the raw material of the polyester transparent powder coating is as defined in any one of claims 1 to 7, and the method comprises the following steps:
s1: uniformly mixing and crushing the hydroxyl-terminated polyester resin, the antifrost agent and the auxiliary agent, and then sequentially carrying out extrusion, compaction, cooling and coarse crushing to obtain a mixture I;
s2: uniformly mixing trimethylolpropane, trihydroxyethyl isocyanurate, adipic acid, methyl propylene glycol and isophthalic acid with the mixture I, crushing, and then sequentially extruding, compacting, cooling, finely crushing and screening to obtain the polyester transparent powder coating.
Preferably, the particle size of the powder sieved in the S2 is 25-35 μm.
Preferably, the extrusion temperature in the S1 and S2 is 90-100 ℃.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the carboxyl-terminated polyester resin is used as a matrix of the powder coating, so that excellent transparency and excellent leveling property of the product are ensured; two trifunctional monomers of trimethylolpropane and trihydroxyethyl isocyanurate are introduced, so that the activity of the carboxyl-terminated polyester resin is effectively improved, the carboxyl-terminated polyester resin meets the condition of low-temperature curing, and meanwhile, the water resistance, the weather resistance and the mechanical property of the powder coating can be improved due to the stable structure of a triazine ring of the trihydroxyethyl isocyanurate; adipic acid and methyl propylene glycol monomers are added to enhance the flexibility of chain segments of the carboxyl-terminated polyester resin, so that the powder coating has good fluidity in the curing process, and the coating has good appearance and mechanical properties; the isophthalic acid is introduced, and the reactivity and the uniqueness of a molecular structure of the isophthalic acid are utilized, so that the reactivity of the carboxyl-terminated polyester resin and the weather resistance of a coating are improved, the problem that a low-temperature cured coating is easy to bloom is solved, the frost resistance of the coating is further enhanced by adopting the 2-butyl-2-ethyl-1, 3-propanediol antifrost agent, the weather resistance and the water resistance of the carboxyl-terminated polyester resin are effectively improved by a larger side group, and the reactivity of the carboxyl-terminated polyester resin can be ensured, so that the coating surface of the powder coating has good weather resistance and good mechanical properties.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a technical scheme that: 50 parts of hydroxyl-terminated polyester resin, 4 parts of trimethylolpropane, 2 parts of trihydroxyethyl isocyanurate, 5 parts of adipic acid, 11 parts of methyl propylene glycol, 6 parts of isophthalic acid, 0.5 part of antifrost agent and 0.5 part of auxiliary agent.
The antifrost agent adopts 2-butyl-2-ethyl-1, 3-propylene glycol.
The auxiliary agent comprises an accelerator, a light stabilizer, a loosening agent, a curing agent and an antioxidant.
Wherein the accelerator is one of quaternary ammonium bromide salt and N-methyl sulfo-p-benzenesulfonamide. The curing agent is a mixture of isocyanate, amino resin and dimethyl imidazole, and the weight ratio of the curing agent to the amino resin is 1:1: 0.5. The light stabilizer is a hindered amine light stabilizer. The defoaming agent is conventional emulsified silicone oil.
A preparation method of polyester transparent powder coating comprises the following steps:
s1: uniformly mixing and crushing the hydroxyl-terminated polyester resin, the antifrost agent and the auxiliary agent, and then sequentially carrying out extrusion, compaction, cooling and coarse crushing to obtain a mixture I;
s2: uniformly mixing trimethylolpropane, trihydroxyethyl isocyanurate, adipic acid, methyl propylene glycol and isophthalic acid with the mixture I, crushing, and then sequentially extruding, compacting, cooling, finely crushing and screening to obtain the polyester transparent powder coating.
Wherein the particle size of the powder sieved in the S2 is 25-35 μm. The extrusion temperature in the S1 and S2 is 90-100 ℃.
Example 2
The invention provides a technical scheme that: 55 parts of hydroxyl-terminated polyester resin, 5 parts of trimethylolpropane, 3 parts of trihydroxyethyl isocyanurate, 6 parts of adipic acid, 14 parts of methyl propylene glycol, 6-10 parts of isophthalic acid, 0.8 part of antifrost agent and 2 parts of auxiliary agent.
The antifrost agent adopts 2-butyl-2-ethyl-1, 3-propylene glycol.
The auxiliary agent comprises an accelerator, a light stabilizer, a loosening agent, a curing agent and an antioxidant.
Wherein the accelerator is one of quaternary ammonium bromide salt and N-methyl sulfo-p-benzenesulfonamide. The curing agent is a mixture of isocyanate, amino resin and dimethyl imidazole, and the weight ratio of the curing agent to the amino resin is 1:1: 0.5. The light stabilizer is a hindered amine light stabilizer. The defoaming agent is conventional emulsified silicone oil.
A preparation method of polyester transparent powder coating comprises the following steps:
s1: uniformly mixing and crushing the hydroxyl-terminated polyester resin, the antifrost agent and the auxiliary agent, and then sequentially carrying out extrusion, compaction, cooling and coarse crushing to obtain a mixture I;
s2: uniformly mixing trimethylolpropane, trihydroxyethyl isocyanurate, adipic acid, methyl propylene glycol and isophthalic acid with the mixture I, crushing, and then sequentially extruding, compacting, cooling, finely crushing and screening to obtain the polyester transparent powder coating.
Wherein the particle size of the powder sieved in the S2 is 25-35 μm. The extrusion temperature in the S1 and S2 is 90-100 ℃.
Example 3
The invention provides a technical scheme that: 60 parts of hydroxyl-terminated polyester resin, 6 parts of trimethylolpropane, 4 parts of trihydroxyethyl isocyanurate, 7 parts of adipic acid, 17 parts of methyl propylene glycol, 10 parts of isophthalic acid, 1.2 parts of antifrost agent and 5 parts of auxiliary agent.
The antifrost agent adopts 2-butyl-2-ethyl-1, 3-propylene glycol.
The auxiliary agent comprises an accelerator, a light stabilizer, a loosening agent, a curing agent and an antioxidant.
Wherein the accelerator is one of quaternary ammonium bromide salt and N-methyl sulfo-p-benzenesulfonamide. The curing agent is a mixture of isocyanate, amino resin and dimethyl imidazole, and the weight ratio of the curing agent to the amino resin is 1:1: 0.5. The light stabilizer is a hindered amine light stabilizer. The defoaming agent is conventional emulsified silicone oil.
A preparation method of polyester transparent powder coating comprises the following steps:
s1: uniformly mixing and crushing the hydroxyl-terminated polyester resin, the antifrost agent and the auxiliary agent, and then sequentially carrying out extrusion, compaction, cooling and coarse crushing to obtain a mixture I;
s2: uniformly mixing trimethylolpropane, trihydroxyethyl isocyanurate, adipic acid, methyl propylene glycol and isophthalic acid with the mixture I, crushing, and then sequentially extruding, compacting, cooling, finely crushing and screening to obtain the polyester transparent powder coating.
Wherein the particle size of the powder sieved in the S2 is 25-35 μm. The extrusion temperature in the S1 and S2 is 90-100 ℃.
The transparent polyester powder coating prepared by the invention can be self-dried and fixed at normal temperature, has higher reactivity and good storage stability at lower temperature, does not appear a pre-curing field in high-temperature extrusion, and has good leveling property, mechanical property and weather resistance without partial frosting. The carboxyl-terminated polyester resin is used as a matrix of the powder coating, so that excellent transparency and excellent leveling property of the product are ensured; two trifunctional monomers of trimethylolpropane and trihydroxyethyl isocyanurate are introduced, so that the activity of the carboxyl-terminated polyester resin is effectively improved, the carboxyl-terminated polyester resin meets the condition of low-temperature curing, and meanwhile, the water resistance, the weather resistance and the mechanical property of the powder coating can be improved due to the stable structure of a triazine ring of the trihydroxyethyl isocyanurate; adipic acid and methyl propylene glycol monomers are added to enhance the flexibility of chain segments of the carboxyl-terminated polyester resin, so that the powder coating has good fluidity in the curing process, and the coating has good appearance and mechanical properties; the isophthalic acid is introduced, and the reactivity and the uniqueness of a molecular structure of the isophthalic acid are utilized, so that the reactivity of the carboxyl-terminated polyester resin and the weather resistance of a coating are improved, the problem that a low-temperature cured coating is easy to bloom is solved, the frost resistance of the coating is further enhanced by adopting the 2-butyl-2-ethyl-1, 3-propanediol antifrost agent, the weather resistance and the water resistance of the carboxyl-terminated polyester resin are effectively improved by a larger side group, and the reactivity of the carboxyl-terminated polyester resin can be ensured, so that the coating surface of the powder coating has good weather resistance and good mechanical properties.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A polyester transparent powder coating is characterized in that: comprises the following components by weight:
50-60 parts of hydroxyl-terminated polyester resin, 4-6 parts of trimethylolpropane, 2-4 parts of trihydroxyethyl isocyanurate, 5-7 parts of adipic acid, 11-17 parts of methyl propylene glycol, 6-10 parts of isophthalic acid, 0.5-1.2 parts of antifrost and 0.5-5 parts of auxiliary agent.
2. A polyester transparent powder coating according to claim 1, characterized in that: the antifrost agent adopts 2-butyl-2-ethyl-1, 3-propylene glycol.
3. A polyester transparent powder coating according to claim 1, characterized in that: the auxiliary agent comprises an accelerator, a light stabilizer, a loosening agent, a curing agent and an antioxidant.
4. The polyester transparent powder coating and the preparation method thereof according to claim 3, characterized in that: the accelerator is one of quaternary ammonium bromide salt and N-methyl sulfo-p-benzenesulfonamide.
5. The polyester transparent powder coating according to claim 4, wherein: the curing agent is a mixture of isocyanate, amino resin and dimethyl imidazole, and the weight ratio of the curing agent to the amino resin is 1:1: 0.5.
6. The polyester transparent powder coating according to claim 5, wherein: the light stabilizer is a hindered amine light stabilizer.
7. The polyester transparent powder coating according to claim 4, wherein: the defoaming agent is conventional emulsified silicone oil.
8. A preparation method of polyester transparent powder coating is characterized by comprising the following steps: the raw material of the polyester transparent powder coating is as defined in any one of claims 1 to 7, and comprises the following steps:
s1: uniformly mixing and crushing the hydroxyl-terminated polyester resin, the antifrost agent and the auxiliary agent, and then sequentially carrying out extrusion, compaction, cooling and coarse crushing to obtain a mixture I;
s2: uniformly mixing trimethylolpropane, trihydroxyethyl isocyanurate, adipic acid, methyl propylene glycol and isophthalic acid with the mixture I, crushing, and then sequentially extruding, compacting, cooling, finely crushing and screening to obtain the polyester transparent powder coating.
9. The transparent polyester powder coating and the preparation method thereof according to claim 8, wherein: the particle size of the powder sieved in the S2 is 25-35 mu m.
10. The transparent polyester powder coating and the preparation method thereof according to claim 8, wherein: the extrusion temperature in the S1 and S2 is 90-100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011258619.4A CN112280444A (en) | 2020-11-12 | 2020-11-12 | Polyester transparent powder coating and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011258619.4A CN112280444A (en) | 2020-11-12 | 2020-11-12 | Polyester transparent powder coating and preparation method thereof |
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| CN112280444A true CN112280444A (en) | 2021-01-29 |
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| CN202011258619.4A Pending CN112280444A (en) | 2020-11-12 | 2020-11-12 | Polyester transparent powder coating and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1954771B1 (en) * | 2005-10-07 | 2009-01-14 | E.I. Du Pont De Nemours And Company | Method of forming a multi-layer coating on automobile bodies without a primer bake |
| JP2012041464A (en) * | 2010-08-20 | 2012-03-01 | Dic Corp | Resin composition for powder coating, powder coating, and coated article |
| CN108912317A (en) * | 2018-06-14 | 2018-11-30 | 中山市绿浪助剂有限公司 | Hydroxyl-terminated polyester resin for powder coating, preparation method and prepared powder coating |
| CN110511365A (en) * | 2019-08-15 | 2019-11-29 | 安徽神剑新材料股份有限公司 | A kind of engineering machinery polyester resin |
-
2020
- 2020-11-12 CN CN202011258619.4A patent/CN112280444A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1954771B1 (en) * | 2005-10-07 | 2009-01-14 | E.I. Du Pont De Nemours And Company | Method of forming a multi-layer coating on automobile bodies without a primer bake |
| JP2012041464A (en) * | 2010-08-20 | 2012-03-01 | Dic Corp | Resin composition for powder coating, powder coating, and coated article |
| CN108912317A (en) * | 2018-06-14 | 2018-11-30 | 中山市绿浪助剂有限公司 | Hydroxyl-terminated polyester resin for powder coating, preparation method and prepared powder coating |
| CN110511365A (en) * | 2019-08-15 | 2019-11-29 | 安徽神剑新材料股份有限公司 | A kind of engineering machinery polyester resin |
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