CN106905841B - Low-temperature cured polyether sulfone coating composition and preparation method and coating process thereof - Google Patents
Low-temperature cured polyether sulfone coating composition and preparation method and coating process thereof Download PDFInfo
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- CN106905841B CN106905841B CN201710052977.1A CN201710052977A CN106905841B CN 106905841 B CN106905841 B CN 106905841B CN 201710052977 A CN201710052977 A CN 201710052977A CN 106905841 B CN106905841 B CN 106905841B
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- 238000000576 coating method Methods 0.000 title claims abstract description 99
- 239000004695 Polyether sulfone Substances 0.000 title claims abstract description 65
- 229920006393 polyether sulfone Polymers 0.000 title claims abstract description 65
- 239000008199 coating composition Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 89
- 238000001723 curing Methods 0.000 claims abstract description 46
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 30
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 239000003822 epoxy resin Substances 0.000 claims abstract description 20
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 16
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 16
- 238000005507 spraying Methods 0.000 claims abstract description 15
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003085 diluting agent Substances 0.000 claims abstract description 10
- 239000004576 sand Substances 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 10
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 238000005488 sandblasting Methods 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 239000000049 pigment Substances 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 7
- 239000012752 auxiliary agent Substances 0.000 claims description 5
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 4
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229940106691 bisphenol a Drugs 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 238000013035 low temperature curing Methods 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 239000000843 powder Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 239000003973 paint Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 229910000423 chromium oxide Inorganic materials 0.000 description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 229910021485 fumed silica Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000002987 primer (paints) Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000002966 varnish Substances 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
- C09D181/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur, with or without nitrogen, oxygen, or carbon only; Coating compositions based on polysulfones; Coating compositions based on derivatives of such polymers
- C09D181/06—Polysulfones; Polyethersulfones
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- 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
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- 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
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a low-temperature cured polyether sulfone coating composition, a preparation method and a coating process thereof, and belongs to the technical field of coatings. The low-temperature cured polyether sulfone coating composition is composed of polyether sulfone resin, epoxy resin, polytetrafluoroethylene, a curing agent and a diluent, and the preparation process comprises the steps of dissolving the polyether sulfone resin in a composite solvent composed of dimethylacetamide, toluene and butanone at a stirring speed of 3200-3800 r/min, sequentially adding the polytetrafluoroethylene and the epoxy resin, grinding for 2-6 hours in a sand mill, adding the curing agent before spraying, stirring for 0.2-0.5 hour for curing, spraying the cured coating on a metal substrate subjected to sand blasting by using an air spray gun and an air compressor, and drying for 2-6 hours at 150-170 ℃. The invention realizes the low-temperature curing of the polyether sulfone coating, the prepared coating has good adhesive force, impact resistance, wear resistance, hydrophobicity, corrosion resistance and the like, the preparation and coating processes are simple to operate, the production equipment is easy to realize, and the application range is wider.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a low-temperature cured polyether sulfone coating composition and a preparation method thereof.
Background
The coating plays an important role in human life, is large to a great apparatus and small to a pot and a ladle, and the use of the coating cannot be separated from the human life. The coating has been widely used in the market with its excellent protective and decorative functions. The paint mainly comprises a film forming substance, a pigment filler, a solvent and an auxiliary agent, wherein the film forming substance is the most important substance. In recent years, with the development of industry, many polymer resins having excellent properties have appeared as film-forming substances instead of the earlier natural substances. Polyethersulfone resins are one of them.
The polyether sulfone resin has the characteristics of high temperature resistance, creep resistance, corrosion resistance, good mechanical property and the like, and the coating prepared by taking polyether sulfone as the main resin also has the advantages of strong adhesive force on metals such as iron, aluminum and the like, good comprehensive performance of the coating and the like, so that in recent years, the polyether sulfone coating is well applied, and researchers develop extensive research on the coating. Such as:
in the patent of thermoplastic high-temperature resistant anti-sticking anticorrosive coating for inner wall of metal pipeline and preparation method thereof, application publication No. CN103194146A, a preparation method of polyether sulfone coating is mentioned, but the coating prepared by the method can reach good coating performance only by high-temperature curing after coating, if the coating is cured at the temperature of 150-170 ℃, after test, the obtained coating generates rust points in 5% NaCl salt mist environment within 3-5 days, and is soaked in acid-base salt solution, and the coating has leakage points within 3-5 days, so that the difference between the performance of the coating and the performance of the coating obtained by high-temperature curing is larger.
In a patent of wear-resistant and corrosion-resistant polyether sulfone coating as well as a preparation method and application thereof, application publication No. CN105238260A, the polyether sulfone coating is cured at 360-390 ℃.
In patent publication No. CN1168403A, the preparation of PES anti-sticking coating by sintering at high and low temperature for cooker and household electrical appliance, the polyether sulfone coating prepared is sintered at 380 deg.C for 20 min. Furthermore, this patent also mentions that low temperature curing is possible, but still requires a sintering temperature of at least 280 ℃, otherwise the desired coating cannot be formed, this temperature is still high and the problem of energy consumption is still serious.
In the patent of primer coating composition and application of the primer coating composition in coating fluororesin on metal surface, application publication No. CN1145627A, the polyether sulfone coating prepared by the method is sintered for 10-40 minutes at 350-400 ℃.
In patent application publication No. CN104974661A, the polyethersulfone superfine powder, the use thereof, the coating containing the polyethersulfone superfine powder and the preparation method thereof, the polyethersulfone coating prepared is mentioned to be dried and solidified into a film at a high temperature of 360 ℃.
From the research results, it can be found that the existing polyether sulfone coating needs to be baked and cured at a high temperature (above 300 ℃) after being coated to form a coating with good performance, and the high-temperature curing has the problems of inconvenient operation, large energy loss, high cost, difficult equipment modification, difficult realization and the like.
Disclosure of Invention
The invention aims to overcome the defects that the performance of a polyether sulfone coating needs to be obviously reduced when the polyether sulfone coating is cured at a low temperature due to high-temperature curing, and provides a polyether sulfone coating composition which can be cured at a low temperature and has excellent performance and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a low-temperature cured polyether sulfone coating composition mainly comprises the following components:
polyether sulfone resin, epoxy resin, polytetrafluoroethylene, a curing agent and a diluent;
the mass ratio of the polyether sulfone resin, the epoxy resin, the polytetrafluoroethylene, the curing agent and the diluent in the low-temperature cured polyether sulfone coating is generally 15-20: 2.5-4: 1-6: 1.2-3: 55-80 parts;
the polyether sulfone resin is hydroxyl-terminated polyether sulfone resin, and the polyether sulfone resin has high hydroxyl end group activity and is easy to react and crosslink with other groups, so that the coating is more compact, and a corrosive medium is prevented from contacting with a substrate better. The structure is as follows
Wherein n is 50-130, the logarithmic specific viscosity of the polyether sulfone resin is 0.28-0.38, and the viscosity of the coating prepared from the polyether sulfone in the viscosity range is moderate and is suitable for spraying. If the polyether sulfone resin is too high in viscosity and poor in leveling property of the coating, the surface of a coating prepared from the coating is rough and uneven, the performance of the coating can be affected, and even the coating cannot be sprayed; if the viscosity is too low, the resulting coating concentration will be correspondingly reduced, and it will tend to sag during spraying, and also affect the mechanical properties of the coating. Preferably, the logarithmic viscosity number is 0.34.
The epoxy resin is a common bisphenol A type epoxy resin, is a thermoplastic resin, has thermosetting property, can form various cured products with excellent performance with various curing agents, catalysts and additives, can almost meet various use requirements, basically does not generate small-molecule volatile substances during curing, can be molded at low pressure, can be dissolved in various solvents, and has high strength and bonding strength. The structure is as follows
Wherein n is 0 to 25, and bisphenol A epoxy resin E44 is preferred.
The curing agent is 1-2 of phenolic amide compounds and phenolic amine compounds, the two curing agents are high in reaction activity and high in curing speed, the curing agent can be cured even in a low-temperature and humid environment, and the molecules of the curing agent have hydroxyl groups, so that the curing agent can be promoted. Preferably 1 to 2 of modified phenol amide curing agent LITE3100 (manufactured by Cardolite corporation, U.S.A.) and phenol aldehyde amine curing agent T31.
The diluent is prepared by mixing toluene, butanone and dimethylacetamide according to a mass ratio of 30-45: 25-35: 0-8.
In addition to the above components, pigments, fillers, and related auxiliaries may be added to the coating composition to further improve the decorative and protective properties of the coating composition.
The pigment and filler can be added with pigments common in the coating field, such as one or a combination of several of iron oxide red, iron oxide black, cobalt green, carbon black, manganese black, chromium oxide, titanium dioxide, pearl powder, molybdenum disulfide, graphite and the like, and can be selectively added according to the required color.
The auxiliary agent can be added with anti-settling auxiliary agent and the like commonly used in the coating field, such as one or a combination of more of organic bentonite, gas-phase silicon dioxide and the like.
The pigment, filler and assistant are added in sequence along with the epoxy resin and the polytetrafluoroethylene in the preparation process.
The preparation method and the coating process of the polyether sulfone coating capable of being cured at low temperature are as follows:
dissolving polyether sulfone resin in a diluent at a stirring speed of 3200-3800 r/min, sequentially adding polytetrafluoroethylene, pigment and filler, an auxiliary agent and epoxy resin, grinding for 2-6 hours in a sand mill, adding a curing agent before spraying, stirring for 0.2-0.5 hours, and curing.
And after curing, spraying the cured coating on the metal substrate subjected to sand blasting by using an air spray gun and an air compressor, and drying for 2-6 hours at the temperature of 150-170 ℃.
The coatings produced by the above method require performance testing according to the following criteria and methods:
1. the thickness of the coating of the panels was tested with reference to GB/T1764-1979 "paint thickness determination".
2. The adhesion of the sample coating is tested with reference to GB9286-98 paint film adhesion test method.
3. The impact resistance of the sample plate coating is tested by referring to GB/T20624.1-2006 paint film impact resistance testing method.
4. The hardness of the sample plate coating is tested by referring to GB/T6739-2006 paint film pencil hardness testing method.
5. The corrosion resistance of the template coating in chemical agents is tested with reference to GB/T9274-1998 test for liquid medium resistance of paints and varnishes. Selecting four chemical reagents of 10% sulfuric acid, 10% sodium hydroxide, toluene and butanone as soaking media, soaking for a certain time, detecting whether the coating leaks electricity (namely whether the coating is damaged) and observing whether the coating has the phenomena of light loss, foaming, falling off and the like.
6. The corrosion resistance of the sample plate coating in neutral salt spray is tested by referring to GB/T1771-1991, an instrument is a Q-Fog circulating salt spray corrosion resistance test box, and the test conditions are as follows: 5% sodium chloride solution is used as electrolyte, the spraying pressure is 8psi, the ambient temperature is 35 ℃, the sample plate is generally placed in a salt spray box by inclining 15 degrees, and the corrosion phenomena such as the foaming condition, the rusting degree and the like of the sample plate are periodically recorded.
7. The contact angle was measured by using a contact angle measuring instrument model JC2000C2, manufactured by Shanghai morning technical Equipment Co. The contact angle can be used for evaluating the hydrophobicity and the anti-sticking performance of the coating surface, and the larger the contact angle of the coating is, the lower the surface energy of the coating is, and the better the hydrophobicity is.
From the results of the above tests, it can be seen that:
1. the coating prepared by the coating provided by the invention has the advantages of good adhesion, moderate thickness and wide applicability.
2. The coating prepared by the coating provided by the invention has a contact angle of more than 110 degrees, and has good hydrophobic property and anti-sticking property.
3. The coating prepared by the paint provided by the invention has strong acid, alkali, salt and organic solvent resistance and good corrosion resistance, and can be suitable for corrosion protection under various working environments.
The polyether sulfone coating capable of being cured at low temperature and the coating prepared from the coating have the following outstanding and characteristic advantages:
1. the invention realizes the low-temperature curing of the coating taking the polyether sulfone as the main resin.
2. The coating provided by the invention avoids the problems of more energy loss, higher cost, inconvenient operation, difficult realization of equipment and the like of high-temperature curing.
3. Compared with other polyether sulfone coatings cured at the same temperature, the coating prepared by the coating provided by the invention has better performance.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Example 1
Under the stirring speed of 3800r/min, 18g of polyether sulfone resin with logarithmic viscosity number of 0.34 is dissolved in a composite solvent consisting of 36g of dimethylacetamide, 28g of toluene and 8g of butanone, 4g of polytetrafluoroethylene micro powder, 3.5g of chromium oxide, 0.5g of titanium dioxide, 1.4g of organobentonite and 3.3g of epoxy resin E44 are sequentially added, and the mixture is ground in a sand mill for 2 hours to prepare the coating. 2.3g of modified phenol amide curing agent LITE3100 (manufactured by Cardolite corporation, USA) was added before spraying, curing was performed by stirring for 0.3 hour, the cured coating was sprayed on the sand-blasted steel plate using an air gun and an air compressor, dried at 168 ℃ for 2 hours, and then cooled to room temperature for testing.
And (3) testing results:
example 2
Under the stirring speed of 3600r/min, 20g of polyether sulfone resin with the logarithmic viscosity number of 0.34 is dissolved in a composite solvent consisting of 42g of dimethylacetamide and 30g of toluene, 1g of polytetrafluoroethylene micro powder, 4g of chromium oxide, 1g of fumed silica and 4g of epoxy resin E44 are sequentially added, and the mixture is ground in a sand mill for 4 hours to prepare the coating. 3g of modified phenol amide curing agent LITE3100 (manufactured by Cardolite corporation, USA) was added before spraying, curing was performed by stirring for 0.4 hour, the cured coating was sprayed on the steel plate subjected to sand blasting using an air gun and an air compressor, dried at 170 ℃ for 6 hours, and then cooled to room temperature for testing.
And (3) testing results:
example 3
15g of polyether sulfone resin with logarithmic specific viscosity of 0.34 is dissolved in a composite solvent consisting of 30g of dimethylacetamide, 35g of toluene and 8g of butanone at the stirring speed of 3400r/min, 5g of polytetrafluoroethylene micro powder, 2g of graphite, 4g of titanium dioxide, 2g of organic bentonite and 2.5g of epoxy resin E44 are sequentially added, and the mixture is ground in a sand mill for 6 hours to prepare the coating. 1.6g of modified phenol amide curing agent LITE3100 (manufactured by Cardolite corporation, USA) was added before spraying, curing was performed by stirring for 0.5 hour, the cured coating was sprayed on a steel plate subjected to sand blasting using an air gun and an air compressor, dried at 170 ℃ for 2 hours, and then cooled to room temperature for testing.
And (3) testing results:
example 4
At the stirring speed of 3200r/min, 20g of polyether sulfone resin with logarithmic viscosity number of 0.34 is dissolved in a composite solvent consisting of 45g of dimethylacetamide and 25g of toluene, 6g of polytetrafluoroethylene micro powder, 2g of fumed silica and 4g of epoxy resin E44 are sequentially added, and the mixture is ground in a sand mill for 5 hours to prepare the coating. 1.2g of phenolic aldehyde amine curing agent T31 was added before spraying, curing was carried out by stirring for 0.2 hour, the cured coating was sprayed on the steel plate subjected to sand blasting using an air gun and an air compressor, dried at 168 ℃ for 6 hours, and then cooled to room temperature for testing.
And (3) testing results:
example 5
15g of polyether sulfone resin with logarithmic viscosity number of 0.34 is dissolved in a composite solvent consisting of 45g of dimethylacetamide and 35g of toluene at the stirring speed of 3800r/min, 2g of polytetrafluoroethylene micro powder, 4g of molybdenum disulfide and 2.5g of epoxy resin E44 are sequentially added, and the mixture is ground in a sand mill for 2 hours to prepare the coating. 1.5g of modified phenol amide curing agent LITE3100 (manufactured by Cardolite corporation, USA) was added before spraying, curing was performed by stirring for 0.3 hour, the cured coating was sprayed on a steel plate subjected to sand blasting using an air gun and an air compressor, dried at 150 ℃ for 2 hours, and then cooled to room temperature for testing.
And (3) testing results:
example 6
Under the stirring speed of 3200r/min, 18g of polyether sulfone resin with logarithmic viscosity number of 0.34 is dissolved in a composite solvent consisting of 38g of dimethylacetamide, 32g of toluene and 4g of butanone, 3g of polytetrafluoroethylene micro powder, 5g of molybdenum disulfide, 1g of organic bentonite and 3.5g of epoxy resin E44 are sequentially added, and the mixture is ground in a sand mill for 6 hours to prepare the coating. 1.2g of phenolic aldehyde amine curing agent T31 was added before spraying, stirred for 0.3 hour for curing, the cured coating was sprayed onto the sandblasted steel plate using an air gun and an air compressor, dried at 150 ℃ for 6 hours, and then cooled to room temperature for testing.
And (3) testing results:
the polyether sulfone coating capable of being cured at low temperature provided by the embodiment realizes low-temperature curing, can save more energy sources compared with high-temperature curing, is simple in preparation process, convenient to operate, low in cost and easy to implement equipment, and a coating film prepared from the coating has good basic performance and corrosion resistance. In actual production, the adding proportion of each component can be adjusted within the range defined by the invention according to the required property to produce the coating meeting the actual requirement, and different pigments can be added according to the required selection to improve the appearance.
Claims (9)
1. A low-temperature cured polyether sulfone coating composition is characterized by comprising the following components:
polyether sulfone resin, epoxy resin, polytetrafluoroethylene, a curing agent and a diluent;
the mass ratio of the polyether sulfone resin, the epoxy resin, the polytetrafluoroethylene, the curing agent and the diluent in the low-temperature cured polyether sulfone coating is 15-20: 2.5-4: 1-6: 1.2-3: 55-80 parts; the polyether sulfone resin is hydroxyl-terminated polyether sulfone resin and has a simple structure of
Wherein n is 50-130, and the logarithmic specific viscosity of the polyether sulfone resin is 0.28-0.38;
the epoxy resin is bisphenol A type epoxy resin; the curing agent is 1-2 of phenolic amide compounds and phenolic amine compounds; the diluent is a composite solvent obtained by mixing toluene, butanone and dimethylacetamide according to the mass ratio of 30-45: 25-35: 0-8.
2. The low temperature cured polyethersulfone coating composition of claim 1, wherein the polyethersulfone resin has a log-specific viscosity of 0.34.
3. The low temperature cured polyethersulfone coating composition of claim 1, wherein said bisphenol-A epoxy resin has the structural formula
Wherein n is 0 to 25.
4. The low temperature cured polyethersulfone coating composition of claim 3, wherein said bisphenol A epoxy resin is bisphenol A epoxy resin E44.
5. The low-temperature-cured polyethersulfone coating composition as claimed in claim 1, wherein said curing agent is modified phenolic amide curing agent LITE3100 and/or phenolic aldehyde amine curing agent T31.
6. The low temperature cured polyethersulfone coating composition of claim 1, wherein said coating composition further comprises pigments, fillers and/or additives.
7. The preparation method of the low-temperature cured polyether sulfone coating composition according to claim 1, which comprises the following specific steps of dissolving polyether sulfone resin in a diluent at a stirring speed of 3200-3800 r/min, sequentially adding polytetrafluoroethylene and epoxy resin, grinding in a sand mill for 2-6 hours, adding a curing agent before spraying, stirring for 0.2-0.5 hour, and curing to obtain the product.
8. The preparation method of the low-temperature cured polyether sulfone coating composition according to claim 6, which comprises the following specific steps of dissolving polyether sulfone resin in a diluent at a stirring speed of 3200-3800 r/min, sequentially adding polytetrafluoroethylene, pigment and filler, an auxiliary agent and epoxy resin, grinding for 2-6 hours in a sand mill, adding a curing agent before spraying, stirring for 0.2-0.5 hour, and curing to obtain the product.
9. The coating process of the low-temperature cured polyether sulfone coating composition as claimed in claim 1 or 6, wherein the cured coating is sprayed onto the metal substrate subjected to sand blasting by using an air spray gun and an air compressor after the coating composition is cured, and is dried at 150-170 ℃ for 2-6 hours.
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| CN108314962B (en) * | 2018-02-07 | 2020-01-03 | 吉林大学 | Cyano-containing polyarylethersulfone/polyethersulfone coating composition and preparation method and coating process thereof |
| CN109207035B (en) * | 2018-07-19 | 2020-10-09 | 慧瑞环保涂料(上海)有限公司 | Fingerprint-resistant environment-friendly water-based paint and preparation method thereof |
| CN113502111B (en) * | 2021-08-31 | 2022-08-26 | 吉林大学 | Environment-friendly polyarylethersulfone high-performance anticorrosive paint and preparation method thereof |
| CN114133832A (en) * | 2021-12-30 | 2022-03-04 | 安徽省金盾涂料有限责任公司 | Acid-resistant paint for ships |
| CN115011207B (en) * | 2022-07-19 | 2023-08-22 | 宁波科鑫腐蚀控制工程有限公司 | Epoxy composite coating and preparation method thereof |
| CN116162391B (en) * | 2022-12-28 | 2023-08-01 | 河南省科学院化学研究所 | Photo-thermal driving limited solid-liquid transition self-repairing anti-corrosion coating material and preparation method thereof |
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