CN116285603A - Weather-resistant epoxy powder coating and preparation method and application thereof - Google Patents
Weather-resistant epoxy powder coating and preparation method and application thereof Download PDFInfo
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- CN116285603A CN116285603A CN202310365192.5A CN202310365192A CN116285603A CN 116285603 A CN116285603 A CN 116285603A CN 202310365192 A CN202310365192 A CN 202310365192A CN 116285603 A CN116285603 A CN 116285603A
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- 239000000843 powder Substances 0.000 title claims abstract description 89
- 238000000576 coating method Methods 0.000 title claims abstract description 82
- 239000011248 coating agent Substances 0.000 title claims abstract description 77
- 239000004593 Epoxy Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 60
- 150000002462 imidazolines Chemical class 0.000 claims abstract description 28
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical class C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims abstract description 27
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003822 epoxy resin Substances 0.000 claims abstract description 26
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 26
- 125000002723 alicyclic group Chemical group 0.000 claims abstract description 19
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 16
- 244000028419 Styrax benzoin Species 0.000 claims abstract description 13
- 235000000126 Styrax benzoin Nutrition 0.000 claims abstract description 13
- 235000008411 Sumatra benzointree Nutrition 0.000 claims abstract description 13
- 229960002130 benzoin Drugs 0.000 claims abstract description 13
- 239000000945 filler Substances 0.000 claims abstract description 13
- 235000019382 gum benzoic Nutrition 0.000 claims abstract description 13
- 239000000049 pigment Substances 0.000 claims abstract description 11
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 20
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims description 20
- 238000005886 esterification reaction Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 12
- 239000010445 mica Substances 0.000 claims description 11
- 229910052618 mica group Inorganic materials 0.000 claims description 11
- 229940008841 1,6-hexamethylene diisocyanate Drugs 0.000 claims description 8
- 125000003277 amino group Chemical group 0.000 claims description 8
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000002250 absorbent Substances 0.000 claims description 7
- 230000002745 absorbent Effects 0.000 claims description 7
- 239000003960 organic solvent Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 239000011353 cycloaliphatic epoxy resin Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229910021487 silica fume Inorganic materials 0.000 claims 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 7
- 239000000126 substance Substances 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- -1 acrylic ester Chemical class 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- HCILJBJJZALOAL-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)-n'-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 HCILJBJJZALOAL-UHFFFAOYSA-N 0.000 description 1
- 241000196322 Marchantia Species 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- MCPKSFINULVDNX-UHFFFAOYSA-N drometrizole Chemical compound CC1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 MCPKSFINULVDNX-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention belongs to the technical field of coatings, and particularly relates to a weather-resistant epoxy powder coating, and a preparation method and application thereof. The invention provides a weather-resistant epoxy powder coating which comprises the following components in parts by mass: 10 to 40 parts of hydrogenated bisphenol A epoxy resin, 10 to 40 parts of alicyclic epoxy resin, 3 to 10 parts of modified imidazoline curing agent, 0.5 to 1.5 parts of leveling agent, 0.5 to 1.5 parts of 701B, 0.5 to 1 part of benzoin, 0.5 to 1 part of wax powder, 10 to 40 parts of filler, 2 to 5 parts of pigment, 0.1 to 2 parts of ultraviolet absorber and 0.1 to 2 parts of antioxidant; the modified imidazoline curing agent has a structure shown in a formula 1. The invention is thatThe weather resistance of the coating is improved together from the aspects of the components and the curing process of the coating, and the weather resistance epoxy powder coating provided by the invention has the characteristics of good weather resistance, good corrosion resistance, good damp-heat resistance and good hardness and toughness.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a weather-resistant epoxy powder coating, and a preparation method and application thereof.
Background
The epoxy resin is a very important thermosetting resin, has the advantages of strong adhesion, chemical corrosion resistance, good mechanical property, heat resistance, impact resistance and the like, and is widely applied to the fields of adhesives and coatings, but the common pure epoxy resin powder coating has the problems of easy pulverization and the like when being used outdoors due to poor weather resistance.
The above problems are mainly solved by adding an antioxidant and an ultraviolet absorber to an epoxy resin powder coating. However, epoxy resin contains a large number of double bonds and benzene-oxygen bonds, and can be cured only at about 200 ℃, so that the antioxidant or ultraviolet absorbent added under the high temperature condition can be deteriorated and volatilized, and the application of the epoxy powder coating is severely restricted.
Disclosure of Invention
In view of the above, the invention provides a weather-resistant epoxy powder coating, a preparation method and application thereof, and the powder coating provided by the invention has higher curing temperature and good weather resistance and corrosion resistance, thereby greatly expanding the application range thereof.
In order to solve the technical problems, the invention provides a weather-resistant epoxy powder coating, which comprises the following components in parts by mass:
the modified imidazoline curing agent has a structure shown in formula 1:
preferably, the epoxy equivalent of the alicyclic epoxy resin is 170-200 g/mol, and the softening point is 70-90 ℃.
Preferably, the preparation method of the modified imidazoline curing agent comprises the following steps:
dissolving imidazoline in an organic solvent to obtain an imidazoline solution;
and mixing the imidazoline solution with 1, 6-hexamethylene diisocyanate to perform an amino esterification reaction to obtain the modified imidazoline curing agent.
Preferably, the mass ratio of the imidazoline to the 1, 6-hexamethylene diisocyanate is 7:16-17.
Preferably, the temperature of the amino group esterification reaction is 70-90 ℃, and the time of the amino group esterification reaction is 2-3 h.
Preferably, the weather-resistant epoxy powder coating has a particle size of 160 mesh or less.
Preferably, the leveling agent is an acrylic ester leveling agent and/or an organosilicon leveling agent.
Preferably, the filler is one or more of barium sulfate, calcium carbonate, calcium sulfate, silica micropowder and mica powder.
The invention also provides a preparation method of the weather-resistant epoxy powder coating, which comprises the following steps:
mixing hydrogenated bisphenol A epoxy resin, alicyclic epoxy resin, modified imidazoline curing agent, leveling agent, 701B, benzoin, wax powder, filler, pigment, ultraviolet absorbent and antioxidant to obtain a mixed material;
and extruding the mixed material by a double-screw extruder, and crushing to obtain the weather-resistant epoxy powder coating.
The invention also provides application of the weather-resistant epoxy powder coating prepared by the technical scheme or the preparation method of the technical scheme in the protection of outdoor heavy corrosion protection or operation equipment in high-humidity and hot environments.
The invention provides a weather-resistant epoxy powder coating which comprises the following components in parts by mass: 10 to 40 parts of hydrogenated bisphenol A epoxy resin, 10 to 40 parts of alicyclic epoxy resin, 3 to 10 parts of modified imidazoline curing agent, 0.5 to 1.5 parts of leveling agent, 0.5 to 1.5 parts of 701B, 0.5 to 1 part of benzoin, 0.5 to 1 part of wax powder, 10 to 40 parts of filler, 2 to 5 parts of pigment, 0.1 to 2 parts of ultraviolet absorber and 0.1 to 2 parts of antioxidant; the modified imidazoline curing agent has a structure shown in formula 1:
according to the modified imidazoline curing agent disclosed by the invention, the curing temperature of a resin system can be greatly reduced, so that the powder coating is cured at 130 ℃, and volatilization and deterioration of an antioxidant and an ultraviolet absorber in the powder coating during high-temperature curing are reduced, so that the weather resistance of the coating is improved. In the present invention, the hydrogenated bisphenol a epoxy resin has high crosslinkability with the alicyclic epoxy resin having a polyfunctional group, and can increase the crosslinking density of the coating layer formed of the powder coating material to thereby increase the water resistance of the coating layer. The weather-resistant epoxy powder coating provided by the invention has the characteristics of good weather resistance, good corrosion resistance, good damp-heat resistance and good hardness and toughness.
Detailed Description
The invention provides a weather-resistant epoxy powder coating which comprises the following components in parts by mass:
in the invention, the weather-resistant epoxy powder coating provided by the invention comprises 10-40 parts by mass of hydrogenated bisphenol A epoxy resin, preferably 26-32 parts by mass, and more preferably 30 parts by mass. In the present invention, the epoxy equivalent of the hydrogenated bisphenol A epoxy resin is preferably 550 to 650g/mol, and the softening point of the hydrogenated bisphenol A epoxy resin is preferably 80 to 90 ℃.
The weather-resistant epoxy powder coating provided by the invention comprises 10-40 parts of alicyclic epoxy resin, preferably 30-35 parts, and more preferably 32 parts, based on the mass parts of hydrogenated bisphenol A epoxy resin. In the present invention, the alicyclic epoxy resin has a structure as shown in formula 2:
in the present invention, the epoxy equivalent of the alicyclic epoxy resin is preferably 170 to 200g/mol, more preferably 170 to 180g/mol. In the present invention, the softening point of the alicyclic epoxy resin is preferably 70 to 90 ℃, more preferably 80 to 90 ℃.
In the present invention, the resin content in the weather-resistant epoxy powder coating material is preferably 50 to 70%, more preferably 60 to 65%.
According to the invention, the hydrogenated bisphenol A epoxy resin is used for replacing part of the alicyclic epoxy resin as the matrix resin, so that the content of double bonds in the alicyclic epoxy resin in the coating is reduced pertinently, and the strength and the moist heat resistance of the cured coating are improved; meanwhile, the alicyclic epoxy resin containing the multifunctional groups and the hydrogenated bisphenol A epoxy resin have good compatibility, and the uniformity and the water resistance of the powder coating are improved.
Based on the mass parts of the hydrogenated bisphenol A epoxy resin, the weather-resistant epoxy powder coating provided by the invention comprises 3-10 parts of modified imidazoline curing agent, preferably 8-10 parts. In the invention, the modified imidazoline curing agent has a structure shown in a formula 1:
in the present invention, the preparation method of the modified imidazoline curing agent preferably comprises the following steps:
dissolving imidazoline in an organic solvent to obtain an imidazoline solution;
and mixing the imidazoline solution with 1, 6-hexamethylene diisocyanate to perform an amino esterification reaction to obtain the modified imidazoline curing agent.
The invention dissolves the imidazoline in the organic solvent to obtain the imidazoline solution. In the present invention, the organic solvent is preferably xylene, toluene or n-hexane, more preferably xylene. In the present invention, the mass ratio of the imidazoline to the organic solvent is preferably 6 to 8:15, more preferably 7:15.
The invention has no special requirement on the dissolution, so long as the dissolution is complete.
After obtaining the imidazoline solution, the invention mixes the imidazoline solution and 1, 6-hexamethylene diisocyanate to carry out amino esterification reaction, thus obtaining the modified imidazoline curing agent. In the present invention, the mass ratio of the imidazoline to the 1, 6-hexamethylene diisocyanate is preferably 7:16 to 17, more preferably 7:16.8.
In the present invention, the mixing is preferably performed under stirring, and the rotation speed of the stirring is preferably 300 to 600r/min, more preferably 400 to 500r/min. The invention has no special requirement on the stirring time, and can be uniformly mixed.
In the present invention, the temperature of the amine group esterification reaction is preferably 70 to 90 ℃, more preferably 80 to 85 ℃; the time for the amine group esterification reaction is preferably 2 to 3 hours, more preferably 2 to 2.5 hours. In the present invention, the amine group esterification reaction is preferably accompanied by stirring at a rotation speed of preferably 300 to 600r/min, more preferably 400 to 500r/min.
In the present invention, the organic solvent is preferably removed by distillation under reduced pressure after the esterification of amine groups. The invention has no special requirement on the reduced pressure distillation, and can be realized by adopting a conventional mode in the field.
In the invention, the modified imidazoline curing agent greatly reduces the curing temperature of an epoxy resin system, improves the reactivity and crosslinking density of the epoxy resin, and reduces the volatilization and deterioration of an antioxidant and an ultraviolet absorbent, thereby improving the weather resistance of the powder coating.
Based on the mass parts of the hydrogenated bisphenol A epoxy resin, the weather-resistant epoxy powder coating provided by the invention comprises 0.5-1.5 parts of flatting agent, preferably 1 part. In the present invention, the leveling agent is preferably an acrylic leveling agent and/or an organosilicon leveling agent, more preferably an acrylic leveling agent. In the invention, when the leveling agent is an acrylic ester leveling agent and an organosilicon leveling agent, the dosage ratio of the acrylic ester leveling agent and the organosilicon leveling agent is not particularly limited, and any ratio is adopted.
The weather-resistant epoxy powder coating provided by the invention comprises 0.5-1.5 parts of 701B, preferably 1 part, based on the mass parts of hydrogenated bisphenol A epoxy resin. In the present invention, 701B acts as a wetting agent, which can increase the adhesion of the coating.
The weather-resistant epoxy powder coating provided by the invention comprises 0.5-1 part of benzoin, preferably 0.7-0.8 part, based on the mass part of hydrogenated bisphenol A epoxy resin. In the present invention, the benzoin acts as a degassing agent.
The weather-resistant epoxy powder coating provided by the invention comprises 0.5-1 part of wax powder, preferably 0.7-0.8 part, based on the mass part of hydrogenated bisphenol A epoxy resin.
The weather-resistant epoxy powder coating provided by the invention comprises 10-40 parts of filler, preferably 17.5-23 parts, and more preferably 20-21.5 parts by mass of hydrogenated bisphenol A epoxy resin. In the present invention, the filler is preferably one or more of barium sulfate, calcium carbonate, calcium sulfate, fine silica powder and mica powder, more preferably mica powder and/or barium sulfate, still more preferably mica powder and barium sulfate. In the invention, when the filler is more than two specific substances, the invention has no special requirement on the proportion of the specific substances, and the filler can be prepared by adopting any proportion. In the embodiment of the invention, the filler is a mixture of mica powder and calcium sulfate in a mass ratio of 10:13, and the mixture of mica powder and calcium sulfate or calcium sulfate in a mass ratio of 10:11.5.
The weather-resistant epoxy powder coating provided by the invention comprises 2-5 parts of pigment, preferably 3-4 parts, based on the mass parts of hydrogenated bisphenol A epoxy resin. The invention has no special requirement on the type of pigment, and the pigment is selected according to the color required by the paint. In the present invention, the pigment is preferably a pearlescent pigment having a barrier effect.
The weather-resistant epoxy powder coating provided by the invention comprises 0.1-2 parts of ultraviolet absorber, preferably 1-1.5 parts, based on the mass parts of hydrogenated bisphenol A epoxy resin. In the present invention, the ultraviolet absorber is preferably one or more of UV-1130, UV-384, UV-928, UV-P, UV-234, UV-326, UV-329 and UV-531, more preferably UV-928 or UV-531. In the invention, when the ultraviolet absorber is more than two specific substances, the invention has no special requirement on the proportion of the specific substances, and the ultraviolet absorber can be prepared by adopting any proportion.
The weather-resistant epoxy powder coating provided by the invention comprises 0.1-2 parts of antioxidant, preferably 1-1.5 parts, based on the mass parts of hydrogenated bisphenol A epoxy resin. In the present invention, the antioxidant is preferably one or more of antioxidant 1024, antioxidant 264, antioxidant 565, antioxidant 168, antioxidant 1010 and antioxidant PL-440, more preferably antioxidant 264 or antioxidant 1010. In the invention, when the antioxidant is more than two specific substances, the invention has no special requirement on the proportion of the specific substances, and the antioxidant can be prepared by adopting any proportion.
In the present invention, the particle size of the weather-resistant epoxy powder coating material is preferably 160 mesh or less. The weather-resistant epoxy powder coating provided by the invention has the characteristics of good weather resistance, good corrosion resistance, moisture and heat resistance and excellent hardness and toughness.
The invention also provides a preparation method of the weather-resistant epoxy powder coating, which comprises the following steps:
mixing hydrogenated bisphenol A epoxy resin, alicyclic epoxy resin, modified imidazoline curing agent, leveling agent, 701B, benzoin, wax powder, filler, pigment, ultraviolet absorbent and antioxidant to obtain a mixed material;
and extruding the mixed material by a double-screw extruder, and crushing to obtain the weather-resistant epoxy powder coating.
The invention mixes hydrogenated bisphenol A epoxy resin, alicyclic epoxy resin, modified imidazoline curing agent, leveling agent, 701B, benzoin, wax powder, filler, pigment, ultraviolet absorbent and antioxidant to obtain a mixed material. In the present invention, the mixing is preferably performed under milling conditions, preferably in the middle of a small steel mill. The invention has no special requirement on grinding, and can be uniformly mixed.
After the mixed material is obtained, the mixed material is extruded by a double-screw extruder and crushed, so that the weather-resistant epoxy powder coating is obtained. The invention has no special requirement on the extrusion by a double-screw extruder, and the extrusion can be carried out according to the conventional mode in the field.
In the present invention, the crushing step preferably further comprises: the crushed product is screened by a mesh screen, and the screened product is taken out. In the present invention, the mesh size of the mesh screen is preferably 160 mesh. The crushing is not particularly limited as long as the desired particle size can be achieved.
The invention also provides application of the weather-resistant epoxy powder coating prepared by the technical scheme or the preparation method of the technical scheme in the protection of outdoor heavy corrosion protection or operation equipment in high-humidity and hot environments. In the present invention, the outdoor heavy corrosion protection or high humidity and heat environment operation equipment preferably comprises underground engineering operation equipment, southeast coastal outdoor metal equipment and chemical industry outdoor equipment.
The technical solutions provided by the present invention are described in detail below in conjunction with examples for further illustrating the present invention, but they should not be construed as limiting the scope of the present invention.
In the examples, hydrogenated bisphenol A epoxy resin is purchased and complexed with a new material (Shanghai) limited company, with the trade name HE-5080;
in the examples, the cycloaliphatic epoxy resin was purchased from the pharmaceutical chemical company, marchantia white;
in the examples, the acrylic leveling agent is purchased from the chemical of south China sea and has the brand: GLP588;
in the examples, the organosilicon leveling agent is purchased from Pick chemistry, brand: BYK-077
In the embodiment, the wax powder is purchased from Nanjing Tianshi wax powder with the brand: PEW0601.
In the embodiment, the raw materials are used in parts by mass, and no special requirement is required for the weight of the raw materials as long as the ratio of the raw materials in parts by mass can be met.
Example 1
Preparing a modified imidazoline curing agent:
dissolving 7 parts of imidazoline in 15 parts of xylene to obtain an imidazoline solution;
stirring an imidazoline solution and 16.8 parts of 1, 6-hexamethylene diisocyanate at a rotation speed of 400r/min, performing an amino esterification reaction (with stirring at the rotation speed of 400 r/min) at 85 ℃ for 2 hours, and then decompressing to remove dimethylbenzene to obtain a modified imidazoline curing agent;
preparation of weather-resistant epoxy powder coating:
26 parts of hydrogenated bisphenol A epoxy resin with the epoxy equivalent of 600g/mol and the softening point of 80 ℃, 35 parts of alicyclic epoxy resin with the epoxy equivalent of 170g/mol and the softening point of 80 ℃, 8.5 parts of modified imidazoline curing agent, 1 part of acrylate leveling agent, 1 part of 701B, 0.7 part of benzoin, 0.8 part of wax powder, 10 parts of mica powder, 13 parts of precipitated barium sulfate, 1.7 parts of iron oxide yellow, 0.3 part of carbon black, 1 part of ultraviolet absorber UV-531 and 1 part of antioxidant 1010 are crushed uniformly in a small steel mill, extruded by a double screw extruder, crushed, ground and screened by a 160-mesh screen, and the screened product is collected to obtain the weather-resistant epoxy powder coating.
Example 2
Preparation of modified imidazoline curing Agents according to the procedure of example 1
32 parts of hydrogenated bisphenol A epoxy resin with the epoxy equivalent of 600g/mol and the softening point of 85 ℃, 32 parts of alicyclic epoxy resin with the epoxy equivalent of 180g/mol and the softening point of 90 ℃, 10 parts of modified imidazoline curing agent, 1 part of organosilicon leveling agent, 1 part of 701B, 0.7 part of benzoin, 0.8 part of wax powder, 17.5 parts of precipitated barium sulfate, 2 parts of ultramarine, 0.7 part of iron oxide red, 0.3 part of carbon black, 1 part of ultraviolet absorber UV-928 and 1 part of antioxidant 264 are crushed in a small steel mill uniformly, extruded by a double screw extruder, crushed, ground and screened by a 160-mesh screen, and the screen is collected to obtain the weather-resistant epoxy powder coating.
Example 3
Modified imidazoline curing agent was prepared as in example 1;
after 30 parts of hydrogenated bisphenol A epoxy resin with the epoxy equivalent of 650g/mol and the softening point of 90 ℃, 30 parts of alicyclic epoxy resin with the epoxy equivalent of 190g/mol and the softening point of 80 ℃, 8 parts of modified imidazoline curing agent, 1 part of acrylate leveling agent, 1 part of 701B, 0.7 part of benzoin, 0.8 part of wax powder, 10 parts of mica powder, 11.5 parts of precipitated barium sulfate, 1.7 parts of iron oxide red, 0.3 part of carbon black, 1 part of ultraviolet absorber UV-531 and 1 part of antioxidant 264 are crushed uniformly in a small steel mill, the mixture is extruded by a double screw extruder, crushed, ground and screened by a 160-mesh screen, and the screened product is collected to obtain the weather-resistant epoxy powder coating.
Comparative example 1
60 parts of E-12 epoxy resin, 2.5 parts of dicyandiamide curing agent, 1 part of acrylic ester leveling agent, 1 part of 701B, 0.7 part of benzoin, 0.8 part of wax powder, 10 parts of mica powder, 17 parts of precipitated barium sulfate, 3.7 parts of titanium white, 0.3 part of carbon black, 1.5 parts of ultraviolet absorbent UV-531 and 1.5 parts of antioxidant 264 are crushed uniformly in a small steel mill, extruded by a double screw extruder, crushed, ground and screened by a 160-mesh screen, and the screened product is collected to obtain the epoxy powder coating.
Comparative example 2
After 30 parts of hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 600g/mol and a softening point of 80 ℃, 30 parts of alicyclic epoxy resin with an epoxy equivalent of 170g/mol and a softening point of 80 ℃, 7.5 parts of dicyandiamide curing agent, 1 part of acrylic leveling agent, 1 part of 701B, 0.7 part of benzoin, 0.8 part of wax powder, 10 parts of mica powder, 12 parts of precipitated barium sulfate, 1.7 parts of iron oxide red, 0.3 part of carbon black, 1 part of ultraviolet absorber UV-531 and 1 part of antioxidant 264 are crushed uniformly in a small steel mill, extruded by a double screw extruder, crushed, ground and screened by a 160-mesh screen, and the screen is collected to obtain the weather-resistant epoxy powder coating.
The weather-resistant epoxy powder coating prepared in the examples 1-3 is sprayed on the surface of a standard iron plate by static electricity, and baked and cured for 20min at 130 ℃ to prepare a standard component; the epoxy powder coating prepared in comparative examples 1 and 2 is sprayed on the surface of a standard iron plate by static electricity, and baked and cured for 20 minutes at 200 ℃ to prepare a standard component; the weather resistance of the standard part coating was measured by referring to GB/T1865-2009 method, the wet heat resistance of the standard part coating was measured by GB/T1740-2007 method, the corrosion resistance of the standard part coating was measured by GB/T1771-1991 method, the surface hardness of the standard part coating was evaluated by GB/T6739-2006 method, and the impact toughness of the standard part coating was measured by GB/T1732-1993 method, and the result was shown in Table 1.
TABLE 1 Properties of the coatings obtained using the coatings of examples 1 to 3 and comparative examples 1 and 2
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | |
| Weather resistance (800 h) | Level 1 | Level 1 | Level 1 | 3 grade | Level 2 |
| Moist heat resistance (500 h) | Level 0 | Level 0 | Level 0 | Level 1 | Level 1 |
| Salt spray resistance (500 h) | ≤1mm | ≤1mm | ≤1mm | ≤2mm | ≤1mm |
| Hardness of pencil | 2H | 3H | 3H | 2H | 3H |
| Impact toughness (kg cm) | 55 | 65 | 60 | 45 | 40 |
As can be seen from the performance parameters in Table 1, the coating obtained by using the coating provided by the invention has good wet heat resistance, salt spray resistance (corrosion resistance), coating surface hardness and impact toughness.
Although the foregoing embodiments have been described in some, but not all, embodiments of the invention, it should be understood that other embodiments may be devised in accordance with the present embodiments without departing from the spirit and scope of the invention.
Claims (10)
1. The weather-resistant epoxy powder coating comprises the following components in parts by mass:
the modified imidazoline curing agent has a structure shown in formula 1:
2. the weatherable epoxy powder coating of claim 1, wherein the cycloaliphatic epoxy resin has an epoxy equivalent weight of 170 to 200g/mol and a softening point of 70 to 90 ℃.
3. The weather-resistant epoxy powder coating according to claim 1, wherein the preparation method of the modified imidazoline curing agent comprises the following steps:
dissolving imidazoline in an organic solvent to obtain an imidazoline solution;
and mixing the imidazoline solution with 1, 6-hexamethylene diisocyanate to perform an amino esterification reaction to obtain the modified imidazoline curing agent.
4. A weather resistant epoxy powder coating according to claim 3, wherein the mass ratio of the imidazoline to the 1, 6-hexamethylene diisocyanate is 7:16-17.
5. The weather-resistant epoxy powder coating according to claim 3 or 4, wherein the temperature of the amine group esterification reaction is 70-90 ℃, and the time of the amine group esterification reaction is 2-3 h.
6. The weatherable epoxy powder coating of claim 1, wherein the weatherable epoxy powder coating has a particle size of 160 mesh or less.
7. The weather-resistant epoxy powder coating according to claim 1, wherein the leveling agent is an acrylate leveling agent and/or an organosilicon leveling agent.
8. The weatherable epoxy powder coating of claim 1, wherein the filler is one or more of barium sulfate, calcium carbonate, calcium sulfate, silica fume, and mica powder.
9. A process for preparing a weatherable epoxy powder coating as defined in any one of claims 1 to 8, comprising the steps of:
mixing hydrogenated bisphenol A epoxy resin, alicyclic epoxy resin, modified imidazoline curing agent, leveling agent, 701B, benzoin, wax powder, filler, pigment, ultraviolet absorbent and antioxidant to obtain a mixed material;
and extruding the mixed material by a double-screw extruder, and crushing to obtain the weather-resistant epoxy powder coating.
10. The use of the weather-resistant epoxy powder coating according to any one of claims 1 to 8 or the weather-resistant epoxy powder coating prepared by the preparation method according to claim 9 for protecting working equipment in outdoor heavy-duty or high-humidity hot environments.
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