CN114752285B - Powder coating for magnesium alloy - Google Patents
Powder coating for magnesium alloy Download PDFInfo
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- CN114752285B CN114752285B CN202210447838.XA CN202210447838A CN114752285B CN 114752285 B CN114752285 B CN 114752285B CN 202210447838 A CN202210447838 A CN 202210447838A CN 114752285 B CN114752285 B CN 114752285B
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- 238000000576 coating method Methods 0.000 title claims abstract description 59
- 239000011248 coating agent Substances 0.000 title claims abstract description 54
- 239000000843 powder Substances 0.000 title claims abstract description 51
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 28
- 229920001225 polyester resin Polymers 0.000 claims abstract description 68
- 239000004645 polyester resin Substances 0.000 claims abstract description 68
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000000049 pigment Substances 0.000 claims abstract description 19
- 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 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 13
- 244000028419 Styrax benzoin Species 0.000 claims abstract description 9
- 235000000126 Styrax benzoin Nutrition 0.000 claims abstract description 9
- 235000008411 Sumatra benzointree Nutrition 0.000 claims abstract description 9
- 229960002130 benzoin Drugs 0.000 claims abstract description 9
- 235000019382 gum benzoic Nutrition 0.000 claims abstract description 9
- 239000004576 sand Substances 0.000 claims abstract description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical class [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 67
- 238000002360 preparation method Methods 0.000 claims description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 229910021389 graphene Inorganic materials 0.000 claims description 19
- 125000005375 organosiloxane group Chemical group 0.000 claims description 19
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 18
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 17
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 14
- 229920000570 polyether Polymers 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000007873 sieving Methods 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
- 230000008033 biological extinction Effects 0.000 claims description 4
- KCFOLUKWAIAKFB-UHFFFAOYSA-N CCC(C=CC=C1)=C1P(C1=CC=CC=C1)C1=CC=CC=C1.Br Chemical compound CCC(C=CC=C1)=C1P(C1=CC=CC=C1)C1=CC=CC=C1.Br KCFOLUKWAIAKFB-UHFFFAOYSA-N 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- 239000006224 matting agent Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 25
- 239000000945 filler Substances 0.000 abstract description 20
- 238000005260 corrosion Methods 0.000 abstract description 17
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002518 antifoaming agent Substances 0.000 abstract description 4
- 238000005282 brightening Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 18
- 230000007797 corrosion Effects 0.000 description 15
- 239000000155 melt Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000005886 esterification reaction Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000006068 polycondensation reaction Methods 0.000 description 6
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 6
- 239000002671 adjuvant Substances 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 5
- 230000003078 antioxidant effect Effects 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000013530 defoamer Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- OJXOOFXUHZAXLO-UHFFFAOYSA-M magnesium;1-bromo-3-methanidylbenzene;bromide Chemical compound [Mg+2].[Br-].[CH2-]C1=CC=CC(Br)=C1 OJXOOFXUHZAXLO-UHFFFAOYSA-M 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000001038 titanium pigment Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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 provides a powder coating for magnesium alloy, which relates to the field of powder coatings, and comprises the following raw materials: modified polyester resin, modified filler, curing agent, pigment, material A and auxiliary agent; the material A comprises a defoaming agent, benzoin, a leveling agent and a brightening agent, or a sand grain agent. The powder coating has better adhesive force and adhesive strength after film formation on the surface of the magnesium alloy, has good anti-corrosion effect, and can effectively solve the problems of bubbles, shrinkage cavities, poor adhesive force and the like generated by surface spraying of the magnesium alloy product.
Description
Technical Field
The invention relates to the field of powder coatings, in particular to a powder coating for magnesium alloy.
Background
The powder coating bicycle is required to have bright and plump appearance, water resistance, wear resistance and outdoor durability, and magnesium alloy materials are newly added from the original materials such as iron, steel, aluminum and the like. The magnesium alloy has the lightest mass and the density of 2/3 of that of aluminum in the metal structural material, is less than 1/4 of that of steel, integrates high shock absorption, high heat conductivity, high rigidity and high bending resistance, can be completely recycled, does not generate waste materials, is an environment-friendly cleaning material, is widely applied to automobile light weight at present, and can reduce the weight of a vehicle by about 30 percent compared with an aluminum alloy hub. The bicycle can achieve the same effect when used for a bicycle, can reduce vibration and improve riding experience. Besides the hub, the magnesium alloy can be used for a plurality of bicycle component materials, including a shock-absorbing front fork outer cylinder of a mountain bike, a magnesium alloy frame, pedals, handles and the like. However, powder coating of magnesium alloy hubs has various technical problems, such as insufficient compactness of magnesium alloy materials, easy occurrence of pinholes, bubbles and other flaws in the coating process, and gradual occurrence of corrosion phenomena such as corrosion, bubbling, cracking and the like and aging phenomena such as coating falling, fading, chalking and the like due to comprehensive effects of environments in long-term use of bicycles. The aesthetic degree of the wheel is reduced, the performance of the wheel is reduced, and the service life of the wheel and even the vehicle is finally influenced.
Patent CN201911378151.X discloses a special anti-corrosion powder coating for pipelines, a preparation method and application thereof, and the raw materials comprise: 20-40 parts of polyester resin, 20-40 parts of epoxy resin, 3-5 parts of curing agent, 0.3-0.5 part of curing accelerator, 1-3 parts of flatting agent, 1-2 parts of brightening agent, 0.2-0.3 part of degasifying agent, 0.5-0.8 part of defoaming agent, 0.2-0.5 part of ultraviolet absorber, 2-5 parts of pigment and 20-40 parts of filler. The coating has high weather resistance and corrosion resistance, high leveling property, excellent toughness and strong binding force, and is suitable for anticorrosive coatings of inner and outer walls of chemical, petroleum, gas and other conveying pipelines.
Patent CN202011575787.6 discloses a graphene modified polyester resin building steel coating, a preparation method and application thereof, and the raw materials comprise: the coating can not only improve the weather resistance and the corrosion resistance of a coating film, but also improve the physical and mechanical properties of the coating film.
Aiming at the problems of bubbles, shrinkage cavities, poor adhesive force and the like generated by the surface spraying of the magnesium alloy product in the prior art, it is necessary to find a powder coating product for solving the defects of the surface spraying of the magnesium alloy product.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a powder coating for magnesium alloy, which is suitable for spraying on the surface of magnesium alloy and can effectively solve the problems of bubbles, shrinkage cavities, poor adhesive force and the like generated by the surface spraying of magnesium alloy products.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a powder coating, which comprises the following raw materials: modified polyester resin, modified filler, curing agent, pigment, material A and auxiliary agent;
the material A comprises a defoaming agent, benzoin, a leveling agent and a brightening agent, or a sand grain agent.
Further, the powder coating comprises the following components in percentage by weight:
45% to 80% of a modified polyester resin;
5% to 40% of modified filler;
2.4 to 6.0% of a curing agent;
0.5% to 1.5% of an antifoaming agent;
benzoin 0.1% to 0.5%;
0.1 to 1.5 percent of leveling agent;
0.1 to 1.5% of brightening agent;
pigment 0.8% to 25%;
0.8 to 1.2 percent of auxiliary agent.
Further, the defoamer comprises a polyamide defoamer, preferably BYK961; the auxiliary agent comprises an antioxidant and/or an ultraviolet absorber; the pigment comprises one or more of titanium dioxide, phthalocyanine blue, iron oxide yellow and carbon black.
Further, the powder coating comprises, in weight percent:
sand grain agent 0.05-1.0%.
Further, the powder coating further comprises, in weight percent:
0.1 to 2.0 percent of wax powder.
Further, the powder coating further comprises: phosphide and/or amide defoamers.
Preferably, the powder coating further comprises: 0.1 to 1.5 percent of phosphide and/or amide defoamer.
Further, the modified polyester resin comprises polyether modified organosiloxane accounting for 0.6 to 3 percent of the mass of the modified polyester resin and graphene accounting for 0.2 to 0.5 percent of the mass of the modified polyester resin.
Further, the preparation method of the modified polyester resin specifically comprises the following steps: according to the conventional polyester resin preparation process, after esterification reaction and polycondensation reaction, 0.6 to 3 percent of polyether modified organosiloxane (Suzhou Parter W-6040) and 0.2 to 0.5 percent of graphene are added into a reaction kettle. The modified polyester resin is obtained by heating, stirring, distilling, cooling, solidifying and crushing. (indicating that polyether modified organosiloxane and graphene do not participate in the polyester synthesis reaction)
Further, the modified filler is barium sulfate and/or calcium carbonate coated with a silane coupling agent on the surface; the mass of the silane coupling agent accounts for 1 to 3 percent of the total mass of the barium sulfate and/or the calcium carbonate.
Further, the preparation method of the modified filler comprises the following steps: and spraying and dispersing the silane coupling agent on the particle surfaces of the barium sulfate and/or the calcium carbonate at the temperature of 60-90 ℃.
Further, the invention also provides a preparation method of the powder coating, which comprises the following steps: mixing and stirring the powder coating raw materials with the formula dosage, extruding, crushing and sieving to obtain the coating.
In some specific embodiments, the method of preparing a powder coating comprises the steps of:
(1) Placing the raw materials with the dosage of the formula in a mixing tank, and stirring for 3-6min to obtain a mixture;
(2) Extruding the mixture obtained in the step (1) in a melt extruder at 80-120 ℃ to obtain an extruded material; the melt extruder is a double-screw or single-screw extruder;
(3) And (3) putting the extruded material obtained in the step (2) into a vertical mill for crushing, and then sieving the crushed material with a 180-mesh sieve to prepare a powder finished product with the particle size (equivalent particle size D50) of 32-38 microns for later use.
Further, the powder coating of the present invention can be applied to magnesium alloy spraying.
The powder coating prepared by the preparation method is coated on the surface of a magnesium alloy product by a high-voltage static method, wherein the high-voltage static is 60-90KV high-voltage static, the average coating thickness is 50-120 micrometers, the curing temperature is 180-200 ℃, the curing time is 10-20 minutes, and curing can be performed by adopting an oven or infrared rays. Preferably, the average coating film thickness is 60-90 micrometers, the curing temperature is 190-200 ℃, and the curing time is 10-15 minutes.
The invention has the technical effects that:
the coating product disclosed by the invention is suitable for being sprayed on the surface of a magnesium alloy, and can effectively solve the problems of bubbles, shrinkage cavities, poor adhesive force and the like generated by the surface spraying of the magnesium alloy product.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Before the embodiments of the invention are explained in further detail, it is to be understood that the invention is not limited in its scope to the particular embodiments described below; it is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention.
Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that the polyether modified organosiloxane used in the present invention is specifically peter W-6040 in su, and the other raw materials are all common commercial products, so the sources thereof are not particularly limited.
Example 1
The powder coating for the magnesium alloy comprises the following components in percentage by mass: 60% modified polyester resin; 4.6% of a curing agent TGIC (triglycidyl isocyanurate); 27.2% modified barium sulfate; 1.0% leveling agent GLP588;0.6% brightener 701B; benzoin 0.3%;0.3% of catalyst promoter ethyl triphenylphosphine bromide; BYK 961.0%; 4.2% pigment; 0.8% of an auxiliary agent;
the pigment in this example comprises 3.0% titanium dioxide; 0.5% phthalocyanine blue; 0.7% iron oxide yellow;
the adjuvants in this example include 0.5% antioxidant 626;0.3% of ultraviolet absorber.
The modified polyester resin in this embodiment includes polyether-modified organosiloxane accounting for 0.6% of the mass of the modified polyester resin and graphene accounting for 0.5% of the mass of the modified polyester resin. The preparation method of the modified polyester resin specifically comprises the following steps: according to the conventional polyester resin preparation process, after esterification reaction and polycondensation reaction, 0.6% polyether modified organosiloxane and 0.5% graphene are added into a reaction kettle. The modified polyester resin is obtained by heating, stirring, distilling, cooling, solidifying and crushing.
In this embodiment, the modified filler barium sulfate is a silane coupling agent whose surface is coated with 1% of the mass of the barium sulfate. The preparation method of the modified filler barium sulfate specifically comprises the step of spraying and dispersing a silane coupling agent on the surfaces of barium sulfate particles at 60 ℃.
The specific preparation method of the powder coating in the embodiment is as follows:
(1) Placing the raw materials with the dosage of the formula above a mixing cylinder and stirring for 3min to obtain a mixture;
(2) Extruding the mixture obtained in the step (1) in a melt extruder at 80 ℃ to obtain an extruded material; the melt extruder is a double-screw or single-screw extruder;
(3) And (3) putting the extruded material obtained in the step (2) into a vertical mill for crushing, and then sieving the crushed material with a 180-mesh sieve to prepare a powder finished product with the particle size (equivalent particle size D50) of 32-38 microns for later use.
The performance of the obtained film is shown in Table 1.
Example 2
The powder coating for the magnesium alloy comprises the following components in percentage by mass: 65% modified polyester resin; 3.5% of a curing agent beta-hydroxyalkylamide; 26.8% modified calcium carbonate; 1.0% leveling agent GLP588;0.7% brightener 701B; benzoin 0.4%;0.6% BYK961;1.0% pigment; 1.0% of an auxiliary agent;
the pigment in this example is carbon black;
the adjuvants in this example included 0.5% uv absorber, 0.5% wax powder.
The modified polyester resin in this example includes polyether-modified organosiloxane accounting for 3% of the mass of the modified polyester resin and graphene accounting for 0.2% of the mass of the modified polyester resin. The preparation method of the modified polyester resin specifically comprises the following steps: according to the conventional polyester resin preparation process, after esterification reaction and polycondensation reaction, adding 3% polyether modified organosiloxane and 0.2% graphene into a reaction kettle. The modified polyester resin is obtained by heating, stirring, distilling, cooling, solidifying and crushing.
In the embodiment, the modified filler barium sulfate is a silane coupling agent with the surface coated with 3 percent of the mass of the calcium carbonate. The preparation method of the modified filler barium sulfate specifically comprises the step of spraying and dispersing a silane coupling agent on the particle surfaces of the barium sulfate at 90 ℃.
The specific preparation method of the powder coating in the embodiment is as follows:
(1) Placing the raw materials with the dosage of the formula above a mixing cylinder and stirring for 6min to obtain a mixture;
(2) Extruding the mixture obtained in the step (1) in a melt extruder at 120 ℃ to obtain an extruded material; the melt extruder is a double-screw or single-screw extruder;
(3) And (3) putting the extruded material obtained in the step (2) into a vertical mill for crushing, and then sieving the crushed material with a 180-mesh sieve to prepare a powder finished product with the particle size (equivalent particle size D50) of 32-38 microns for later use.
The procedure is as in example 1.
Example 3
The powder coating for the magnesium alloy comprises the following components in percentage by mass: 50% modified polyester resin; 3.8% curative TGIC;41% modified delustering barium sulfate; 0.4% sand streaking agent; 0.2% of a curing accelerator; 3.4% pigment; 1.2% of an auxiliary agent;
the pigment in this example is carbon black;
the adjuvants in this example included 0.5% antioxidant, 0.3% ultraviolet absorber and 0.4% wax powder.
The modified polyester resin in this example includes polyether-modified organosiloxane accounting for 1.5% of the mass of the modified polyester resin and graphene accounting for 0.3% of the mass of the modified polyester resin. The preparation method of the modified polyester resin specifically comprises the following steps: according to the conventional polyester resin preparation process, after esterification reaction and polycondensation reaction, adding required 1.5% polyether modified organosiloxane and 0.3% graphene into a reaction kettle. The modified polyester resin is obtained by heating, stirring, distilling, cooling, solidifying and crushing.
In the embodiment, the modified filler barium sulfate is a silane coupling agent with the surface coated with the silane coupling agent accounting for 2% of the mass of the calcium carbonate. The preparation method of the modified filler barium sulfate specifically comprises the step of spraying and dispersing a silane coupling agent on the particle surfaces of the barium sulfate at 80 ℃.
The specific preparation method of the powder coating in the embodiment is as follows:
(1) Placing the raw materials with the dosage of the formula above a mixing cylinder and stirring for 5min to obtain a mixture;
(2) Extruding the mixture obtained in the step (1) in a melt extruder at 90 ℃ to obtain an extruded material; the melt extruder is a double-screw or single-screw extruder;
(3) And (3) putting the extruded material obtained in the step (2) into a vertical mill for crushing, and then sieving the crushed material with a 180-mesh sieve to prepare a powder finished product with the particle size (equivalent particle size D50) of 32-38 microns for later use.
The procedure is as in example 1.
Example 4
The powder coating for the magnesium alloy comprises the following components in percentage by mass: 80% modified polyester resin; 6% curative TGIC;8.7% modified matt barium sulfate; 1.0% leveling agent GLP588;0.2% of a curing accelerator; 2.8% matting agent; 0.8% brightener; 0.5% benzoin; 0.8% pigment; 1.2% of an auxiliary agent;
the pigment in this example is carbon black;
the adjuvants in this example included 0.5% antioxidant, 0.3% ultraviolet absorber and 0.4% wax powder.
The modified polyester resin in this embodiment includes polyether-modified organosiloxane accounting for 0.6% of the mass of the modified polyester resin and graphene accounting for 0.5% of the mass of the modified polyester resin. The preparation method of the modified polyester resin specifically comprises the following steps: according to the conventional polyester resin preparation process, after esterification reaction and polycondensation reaction, 0.6% polyether modified organosiloxane and 0.5% graphene are added into a reaction kettle. The modified polyester resin is obtained by heating, stirring, distilling, cooling, solidifying and crushing.
In this embodiment, the modified filler barium sulfate is a silane coupling agent whose surface is coated with 1% of the mass of the barium sulfate. The preparation method of the modified filler barium sulfate specifically comprises the step of spraying and dispersing a silane coupling agent on the surfaces of barium sulfate particles at 60 ℃.
The specific preparation method of the powder coating in the embodiment is as follows:
(1) Placing the raw materials with the dosage of the formula above a mixing cylinder and stirring for 3min to obtain a mixture;
(2) Extruding the mixture obtained in the step (1) in a melt extruder at 80 ℃ to obtain an extruded material; the melt extruder is a double-screw or single-screw extruder;
(3) And (3) putting the extruded material obtained in the step (2) into a vertical mill for crushing, and then sieving the crushed material with a 180-mesh sieve to prepare a powder finished product with the particle size (equivalent particle size D50) of 32-38 microns for later use.
The procedure is as in example 1.
Example 5
The powder coating for the magnesium alloy comprises the following components in percentage by mass: 65% modified polyester resin; 4.9% curative TGIC;20% modified extinction barium sulfate; 0.4% sand streaking agent; 0.2% of a curing accelerator; 8.3% pigment; 1.2% of an auxiliary agent;
the pigments in this embodiment are carbon black and titanium pigment;
the adjuvants in this example included 0.5% antioxidant, 0.3% ultraviolet absorber and 0.4% wax powder.
The modified polyester resin in this example includes polyether-modified organosiloxane accounting for 3% of the mass of the modified polyester resin and graphene accounting for 0.2% of the mass of the modified polyester resin. The preparation method of the modified polyester resin specifically comprises the following steps: according to the conventional polyester resin preparation process, after esterification reaction and polycondensation reaction, adding 3% polyether modified organosiloxane and 0.2% graphene into a reaction kettle. The modified polyester resin is obtained by heating, stirring, distilling, cooling, solidifying and crushing.
In the embodiment, the modified filler barium sulfate is a silane coupling agent with the surface coated with 3 percent of the mass of the calcium carbonate. The preparation method of the modified filler barium sulfate specifically comprises the step of spraying and dispersing a silane coupling agent on the particle surfaces of the barium sulfate at 90 ℃.
The specific preparation method of the powder coating in the embodiment is as follows:
(1) Placing the raw materials with the dosage of the formula above a mixing cylinder and stirring for 6min to obtain a mixture;
(2) Extruding the mixture obtained in the step (1) in a melt extruder at 120 ℃ to obtain an extruded material; the melt extruder is a double-screw or single-screw extruder;
(3) And (3) putting the extruded material obtained in the step (2) into a vertical mill for crushing, and then sieving the crushed material with a 180-mesh sieve to prepare a powder finished product with the particle size (equivalent particle size D50) of 32-38 microns for later use.
The procedure is as in example 1.
Comparative example 1
The only difference from example 1 is that the modified polyester resin was replaced with an equivalent amount of unmodified polyester resin and the modified filler was replaced with an equivalent amount of unmodified filler barium sulfate.
Comparative example 2
The only difference from example 1 is that the modified polyester resin was replaced with an equivalent amount of unmodified polyester resin.
Comparative example 3
The only difference from example 1 is that the modified filler is replaced by an equivalent amount of unmodified filler barium sulfate.
Comparative example 4
The only difference from example 1 is that the polyether modified organosiloxane and the graphene modified polyester resin were replaced with an equivalent amount of dihexyl adipate modified polyester resin.
Performance test: the coatings of each example were subjected to performance testing, and specific test data are shown in Table 1. The corrosion resistance test comprises an acid resistance test and an alkali resistance test, wherein each coating is sprayed on the surface of a flat magnesium alloy, the thickness of a dried coating film is 0.1mm, then the coating film is respectively soaked in 8% hydrochloric acid aqueous solution and 10% sodium hydroxide aqueous solution in percentage by mass for 12 days, and the surface condition of the coating film is observed after the soaking is completed.
TABLE 1
| Project | 2mm cross cut adhesion GB/T4893.4 | Impact strength GB/T1732 | Coating morphology (observing whether there is air bubble) or limit image | Corrosion resistance |
| Example 1 | 0 | 50kg.cm positive recoil pass | Bubble-free | No corrosion |
| Example 2 | 0 | 50kg.cm positive recoil pass | Bubble-free | No corrosion |
| Example 3 | 1 | 50kg.cm positive punch through | Bubble-free | Single point corrosion |
| Example 4 | 0 | 50kg.cm positive recoil pass | With bubbles | No corrosion |
| Example 5 | 0 | 50kg.cm positive recoil pass | Bubble-free | No corrosion |
| Comparative example 1 | 2 | 30kg.cm positive punch through | Serious bubble | Localized corrosion of |
| Comparative example 2 | 1 | 50kg.cm positive punch through | With bubbles | Localized corrosion of |
| Comparative example 3 | 1 | 50kg.cm positive punch through | Bubble-free | No corrosion |
| Comparative example 4 | 0 | 50kg.cm positive recoil pass | With bubbles | Localized corrosion of |
Finally, it should be noted that the above description is only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and that the simple modification and equivalent substitution of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. A powder coating, characterized by: the raw materials consist of the following components in percentage by weight: 60% modified polyester resin; 4.6% curative TGIC;27.2% modified barium sulfate; 1.0% leveling agent GLP588;0.6% brightener 701B; benzoin 0.3%;0.3% of catalyst promoter ethyl triphenylphosphine bromide; BYK 961.0%; 4.2% pigment; 0.8% of an auxiliary agent;
the modified polyester resin comprises polyether modified organosiloxane accounting for 0.6 percent of the mass of the modified polyester resin and graphene accounting for 0.5 percent of the mass of the modified polyester resin; the modified barium sulfate is barium sulfate coated with a silane coupling agent on the surface.
2. A powder coating, characterized by: the raw materials consist of the following components in percentage by weight: 65% modified polyester resin; 3.5% of a curing agent beta-hydroxyalkylamide; 26.8% modified calcium carbonate; 1.0% leveling agent GLP588;0.7% brightener 701B; benzoin 0.4%;0.6% byk961;1.0% pigment; 1.0% of an auxiliary agent;
the modified polyester resin comprises polyether modified organosiloxane accounting for 3% of the mass of the modified polyester resin and graphene accounting for 0.2% of the mass of the modified polyester resin; the modified calcium carbonate is calcium carbonate coated with a silane coupling agent on the surface.
3. A powder coating, characterized by: the raw materials consist of the following components in percentage by weight: 80% modified polyester resin; 6% curative TGIC;8.7% modified matt barium sulfate; 1.0% leveling agent GLP588;0.2% of a curing accelerator; 2.8% matting agent; 0.8% brightener; 0.5% benzoin; 0.8% pigment; 1.2% of an auxiliary agent;
the modified polyester resin comprises polyether modified organosiloxane accounting for 0.6 percent of the mass of the modified polyester resin and graphene accounting for 0.5 percent of the mass of the modified polyester resin; the modified extinction barium sulfate is barium sulfate coated with a silane coupling agent on the surface.
4. A powder coating, characterized by: the raw materials consist of the following components in percentage by weight: 65% modified polyester resin; 4.9% curative TGIC;20% modified extinction barium sulfate; 0.4% sand streaking agent; 0.2% of a curing accelerator; 8.3% pigment; 1.2% of an auxiliary agent;
the modified polyester resin comprises polyether modified organosiloxane accounting for 3% of the mass of the modified polyester resin and graphene accounting for 0.2% of the mass of the modified polyester resin; the modified extinction barium sulfate is barium sulfate coated with a silane coupling agent on the surface.
5. A process for the preparation of a powder coating as claimed in any one of claims 1 to 4, wherein: the method comprises the following steps: mixing and stirring the powder coating raw materials with the formula dosage, extruding, crushing and sieving to obtain the coating.
6. Use of the powder coating according to any one of claims 1-4 in magnesium alloy spraying.
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Denomination of invention: A powder coating for magnesium alloys Granted publication date: 20230922 Pledgee: Bank of Jinhua Limited by Share Ltd. Pledgor: ZHEJIANG CHAOLANG ADVANCED MATERIALS Co.,Ltd. Registration number: Y2024980002526 |