CN115746678B - Powder coating for coiled material aluminum plate and preparation method thereof - Google Patents
Powder coating for coiled material aluminum plate and preparation method thereof Download PDFInfo
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- CN115746678B CN115746678B CN202211376708.8A CN202211376708A CN115746678B CN 115746678 B CN115746678 B CN 115746678B CN 202211376708 A CN202211376708 A CN 202211376708A CN 115746678 B CN115746678 B CN 115746678B
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- 238000000576 coating method Methods 0.000 title claims abstract description 141
- 239000011248 coating agent Substances 0.000 title claims abstract description 124
- 239000000843 powder Substances 0.000 title claims abstract description 78
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 68
- 239000000463 material Substances 0.000 title abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 22
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical class [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 90
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
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- 239000000945 filler Substances 0.000 claims abstract description 7
- 239000007822 coupling agent Substances 0.000 claims description 40
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 claims description 26
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 22
- 239000003963 antioxidant agent Substances 0.000 claims description 13
- 230000003078 antioxidant effect Effects 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 5
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
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- 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 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 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
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- 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 1
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- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
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- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The invention discloses a powder coating for coiled material aluminum plates and a preparation method thereof, belonging to the field of powder coatings, wherein the powder coating comprises the following components in parts by mass: 55 to 90 parts of carboxyl-terminated polyester resin, 5 to 15 parts of curing agent, 1 to 25 parts of surface modified barium sulfate, 0 to 40 parts of filler, 0 to 12 parts of pigment and 0 to 10 parts of auxiliary agent. The powder coating provided by the invention can be used for preparing the coating of the coiled material aluminum plate, can not only meet the coating process of the coiled material, but also have the advantages of excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and the like while meeting the thick coating requirement of the coiled material aluminum plate.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a powder coating for coiled material aluminum plates and a preparation method thereof.
Background
With the rapid development of industries such as construction, household appliances, transportation and the like in China in recent decades, the demand for coiled materials is rapidly increased, and coiled aluminum is also rapidly developed as an important part of the coiled materials. The coiled material aluminum plate has the advantages of light weight, easy installation, easy processing and forming, convenient and quick construction and the like, and the service life of the aluminum coil is long, and the aluminum coil is generally not corroded for more than 20 years because the aluminum has corrosion resistance. The aluminum coil has high recycling value, and the coiled iron plate is likely to be corroded after being used, but the aluminum coil has high recycling value due to corrosion resistance. At present, almost all precoated coil panels are coated with an oily liquid coating. Because the oily liquid paint not only contains organic solvents (VOC) harmful to the environment, but also needs to be subjected to a two-coating and two-baking process in a common solvent type aluminum coil plate, a large amount of energy is consumed. The pollution of waste water, sludge and waste gas discharged by the coating industry for coiled material aluminum plates to the environment is serious, the volatile organic matters are huge to human bodies and harm, and along with the maturity of the spray coating technology of the coiled material aluminum plate powder coating, the coiled material aluminum plate powder coating is also imperative to replace solvent type coating.
Compared with coiled material galvanized plates, the aluminum plate has poor ductility, the substrate can be cracked during bending, the requirement on the bending resistance of the coating is higher, and meanwhile, the spraying thickness of the coiled material aluminum plate can reach 60-100 mu m, and the thickness is higher. And the quality of the aluminum plate with the same thickness is low relative to the coiled material galvanized plate, and the powdering rate is poor. And the aluminum plate surface is smoother, and the adhesive force is poorer than that of a coiled galvanized plate. In the patent of coiled galvanized sheet materials, CN105273581A realizes quick curing (10-30 s) by changing the curing mode and the formula of powder coating, and has excellent weather resistance and acid-base resistance, mainly because fluorocarbon resin is used, but the adhesive force of a coating can be influenced after the fluorocarbon resin is added, the T-bend performance of the coating can be influenced, and for sheet materials with higher coating requirements, such as aluminum sheet materials, the T-bend performance and the adhesive force of the coating are poor due to the powder coating; the CN106752756A effectively matches the special polyester resin with other components to solve the problem that the traditional polyester resin/HAA system cannot be completely cured in a short time (25-30 s) when the traditional polyester resin/HAA system is thermally cured by infrared radiation, so that the impact, hardness, MEK and the like of a coating cannot meet the requirements of a color-coated plate, and the powder coating achieves the effects of a quick spraying process and the like of the powder coating at the line speed of 60m/min for the first time, but the powder coating is mainly used for coating a galvanized sheet of a coil steel building material, and the coating thickness of 25-40 mu m is not suitable for coating an aluminum coil plate; CN109971318A is a powder coating for coiled material of household electrical appliances and its preparation method, the effect of hardness 3H and 0T is achieved by using modified resin and auxiliary agent, because the thickness of the powder coating for coiled material of household electrical appliances is only 45-80 μm, but the toughness of the base material of aluminum plate is poor, the thickness (up to 100 μm) is higher, and the powder coating for coiled material of household electrical appliances can not meet the T-bend requirement of aluminum plate. CN111073471a is a solvent-based coil coating special for aluminum plate coils and a preparation method thereof, is a solvent-based metal coil coating, and is not suitable for coating powder coating for coil aluminum plates.
The thickness of the powder coating of the common coiled steel plate is 25-40 mu m (used for coating the building material plates), the thickness of the powder coating of the household appliance coiled steel plate is 45-80 mu m, the thickness requirement of the powder coating of the coiled steel plate is higher (60-100 mu m), under the condition of the same thickness, the adsorption capacity of the aluminum plate to powder is not good as that of the coiled steel plate, in addition, the flexibility of the coiled aluminum plate substrate relative to the iron plate is poorer, the coiled aluminum plate substrate can crack under the same bending degree of 0T substrate, and the coiled steel plate cannot crack due to high strength. Meanwhile, the higher the thickness of the aluminum coil coating is, the performance such as flexibility, T-bend performance, impact resistance and the like of the whole coating can be reduced, in the processing of the coiled aluminum plate, the collision is easy to occur due to lighter mass, the requirement on hardness is high, meanwhile, the coating of the aluminum plate is thicker, and the common requirements on the flexibility and T-bend performance of the powder coating for the coiled aluminum plate cannot meet the requirements on the T-bend performance and the post-processing performance of the powder coating for the coiled aluminum plate.
Disclosure of Invention
In order to overcome the problems in the prior art, one of the purposes of the invention is to provide a powder coating for coiled aluminum plates, which not only can meet the coating process of coiled aluminum plates, but also has the advantages of excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and the like while meeting the thick coating requirements of the coiled aluminum plates.
The second object of the present invention is to provide a method for preparing the powder coating for coiled aluminum sheet.
It is a further object of the present invention to provide a coating layer made of a powder coating material for coil aluminum sheet as described above.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a powder coating for coiled material aluminum plates, which comprises the following components in parts by mass: 55 to 90 parts of carboxyl-terminated polyester resin, 5 to 15 parts of curing agent, 1 to 25 parts of surface modified barium sulfate, 0 to 40 parts of filler, 0 to 12 parts of pigment and 0 to 10 parts of auxiliary agent.
Preferably, in the powder coating for coiled material aluminum plate, the mass part of the surface modified barium sulfate is 5-20 parts.
Preferably, the powder coating comprises the following components in parts by mass: 60 to 85 parts of carboxyl-terminated polyester resin, 7 to 10 parts of curing agent, 5 to 20 parts of surface modified barium sulfate, 15 to 35 parts of filler, 0.5 to 10 parts of pigment and 1 to 8 parts of auxiliary agent.
Preferably, the surface modified barium sulfate is barium sulfate co-modified by an aminosilane coupling agent and maleic anhydride.
Preferably, the mass ratio of the barium sulfate to the aminosilane coupling agent to the maleic anhydride is 100: (0.1-5): (0.1 to 5); further preferably, the mass ratio of the barium sulfate to the aminosilane coupling agent to the maleic anhydride is 100: (0.5-1.5): (0.5-1.5).
Preferably, the surface-modified barium sulfate is prepared by a process comprising the steps of: drying barium sulfate, adding maleic anhydride, an oxidant and an antioxidant, mixing to obtain maleic anhydride modified barium sulfate, and adding an aminosilane coupling agent for modification to obtain aminosilane coupling agent and maleic anhydride co-modified barium sulfate;
more preferably, the surface-modified barium sulfate is prepared by a process comprising the steps of: and adding a titanate coupling agent and an aluminate coupling agent into the barium sulfate which is jointly modified by the aminosilane coupling agent and the maleic anhydride for mixing, and then adding butyl stearate for mixing to obtain the modified barium sulfate with good surface wettability.
The modified barium sulfate with good surface wettability is favorable for subsequent full melt mixing with other components in the powder coating.
Preferably, in the preparation method of the surface modified barium sulfate, the barium sulfate is dried until the water content is less than 1%.
Preferably, in the preparation method of the surface modified barium sulfate, the drying temperature of the barium sulfate is 100-150 ℃; more preferably, the drying temperature of barium sulfate is 115 to 130 ℃.
Preferably, in the preparation method of the surface modified barium sulfate, the drying time of the barium sulfate is 40-150 min; more preferably, the drying time of barium sulfate is 60 to 120 minutes.
Preferably, in the preparation method of the surface modified barium sulfate, the mass ratio of the barium sulfate to the maleic anhydride to the oxidant to the antioxidant is 100: (0.1-5): (0.1-5): (0.1 to 5); more preferably, the mass ratio of the barium sulfate, the maleic anhydride, the oxidant and the antioxidant is 100: (0.5-1.5): (0.5-1.5): (0.5-1.5).
Preferably, in the preparation method of the surface modified barium sulfate, the mixing temperature of the barium sulfate, the maleic anhydride, the oxidant and the antioxidant is 60-90 ℃; more preferably, the mixing temperature of the barium sulfate, the maleic anhydride, the oxidant and the antioxidant is 70-80 ℃.
Preferably, in the preparation method of the surface modified barium sulfate, the mixing time of the barium sulfate, the maleic anhydride, the oxidant and the antioxidant is 50-90 min; more preferably, the mixing time of the barium sulfate, the maleic anhydride, the oxidant and the antioxidant is 60-80 min.
Preferably, in the preparation method of the surface modified barium sulfate, the oxidant is at least one of hydrogen peroxide, concentrated sulfuric acid and potassium permanganate.
Preferably, in the preparation method of the surface modified barium sulfate, the mass ratio of the maleic anhydride modified barium sulfate to the aminosilane coupling agent is 100: (0.1 to 5); more preferably, the mass ratio of the maleic anhydride modified barium sulfate to the aminosilane coupling agent is 100: (0.5-1.5).
Preferably, in the preparation method of the surface modified barium sulfate, the mixing temperature of the maleic anhydride modified barium sulfate and the aminosilane coupling agent is 100-130 ℃; more preferably, the mixing temperature of the maleic anhydride modified barium sulfate and the aminosilane coupling agent is 110-120 ℃.
Preferably, in the preparation method of the surface modified barium sulfate, the mixing time of the maleic anhydride modified barium sulfate and the aminosilane coupling agent is 10-30 min; more preferably, the mixing time of the maleic anhydride modified barium sulfate and the aminosilane coupling agent is 15 to 25 minutes.
Preferably, in the preparation method of the surface modified barium sulfate, the mass ratio of the aminosilane coupling agent to the maleic anhydride co-modified barium sulfate, the titanate coupling agent and the aluminate coupling agent is 100: (0.1-5): (0.1 to 5); more preferably, the mass ratio of the aminosilane coupling agent to the maleic anhydride co-modified barium sulfate, the titanate coupling agent and the aluminate coupling agent is 100: (0.5-1.5): (0.5-1.5).
Preferably, in the preparation method of the surface modified barium sulfate, the mixing temperature of the barium sulfate, the titanate coupling agent and the aluminate coupling agent which are jointly modified by the aminosilane coupling agent and the maleic anhydride is 90-120 ℃; more preferably, the mixing temperature of the barium sulfate, the titanate coupling agent and the aluminate coupling agent which are jointly modified by the aminosilane coupling agent and the maleic anhydride is 100-110 ℃.
Preferably, in the preparation method of the surface modified barium sulfate, the mixing time of the barium sulfate, the titanate coupling agent and the aluminate coupling agent which are jointly modified by the aminosilane coupling agent and the maleic anhydride is 5-20 min; more preferably, the mixing time of the barium sulfate, the titanate coupling agent and the aluminate coupling agent which are jointly modified by the aminosilane coupling agent and the maleic anhydride is 10-15 min.
Preferably, in the preparation method of the surface modified barium sulfate, butyl stearate is added for mixing at 60-90 ℃; more preferably, butyl stearate is added and mixed at a temperature of 70 to 80 ℃.
Preferably, in the preparation method of the surface modified barium sulfate, butyl stearate is added for mixing for 5-20 min; more preferably, butyl stearate is added and mixed for a period of 10 to 15 minutes.
Preferably, in the powder coating for coiled material aluminum plate, the mass part of the carboxyl-terminated polyester resin is 60-85 parts.
Preferably, the acid value of the carboxyl-terminated polyester resin is 35-70 mgKOH/g; more preferably, the carboxyl terminated polyester resin has an acid value of 40 to 65mgKOH/g.
Preferably, the ICI melt viscosity of the carboxyl terminated polyester resin at 200 ℃ is 2000-6000 mpa.s; more preferably, the ICI melt viscosity of the carboxyl terminated polyester resin at 200 ℃ is 3000 to 5000mpa·s.
Preferably, in the powder coating for coiled aluminum sheet, the mass part of the curing agent is 7-10 parts.
Preferably, the curing agent comprises at least one of beta-hydroxyalkylamide, triglycidyl isocyanurate and blocked isocyanate; more preferably, the curing agent is a β -hydroxyalkylamide.
Preferably, in the powder coating for coiled aluminum sheet, the mass part of the filler is 15-35 parts.
Preferably, the filler comprises at least one of barium sulfate, silica micropowder, mica powder and rutile titanium dioxide.
Preferably, in the powder coating for coiled aluminum sheet, the mass part of the pigment is 0.5-10 parts.
Preferably, the pigment comprises at least one of outdoor universal type pigments; more preferably, the pigment comprises at least one of iron oxide red, iron oxide yellow, carbon black, ultramarine, iron yellow, phthalocyanine blue, phthalocyanine green.
Preferably, in the powder coating for coiled aluminum plates, the mass part of the auxiliary agent is 1-8 parts.
Preferably, the auxiliary agent comprises at least one of a flexibilizer, a leveling agent, an antioxidant, a degassing agent and a ventilation agent.
Preferably, the pliable agent is a thermoplastic polyimide.
Preferably, the leveling agent comprises an acrylate leveling agent.
Preferably, the antioxidant comprises at least one of antioxidant 168, antioxidant 3114, antioxidant DLTDP, antioxidant 1010 and antioxidant 1076.
Preferably, the degasifying agent comprises at least one of benzoin, breathable wax, polyether; more preferably, the breathable wax comprises at least one of micronized modified polyethylene wax, polypropylene wax, polytetrafluoroethylene wax.
A second aspect of the present invention provides a method for preparing the powder coating according to the first aspect of the present invention, comprising the steps of: mixing the components, extruding, and pulverizing to obtain the powder coating.
Preferably, in the method for preparing the powder coating, the extrusion is performed by using a twin screw extruder.
Preferably, the temperature of the first area of the extruder is 90-110 ℃, and the temperature of the second area of the extruder is 95-110 ℃; more preferably, the temperature of the extruder zone I is 95 to 105 ℃ and the temperature of zone II is 100 to 105 ℃.
Preferably, the D50 particle size of the powder coating is 25-45 mu m; more preferably, the D50 particle size of the powder coating is 35-45 μm.
A third aspect of the invention provides a coating formed from a powder coating comprising the first aspect of the invention.
Preferably, the coating is a coil aluminum plate coating.
Preferably, the coating thickness is 60 to 100 μm.
The beneficial effects of the invention are as follows:
the powder coating provided by the invention can be used for preparing the coating of the coiled material aluminum plate, can not only meet the coating process of the coiled material, but also have the advantages of excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and the like while meeting the thick coating requirement of the coiled material aluminum plate.
In particular, compared with the prior art, the invention has the following advantages:
1. according to the invention, the barium sulfate is subjected to surface modification, the amino silane coupling agent and maleic anhydride are utilized to jointly modify the barium sulfate powder, the amino silane coupling agent can form an amide bond with carboxyl-terminated polyester resin, meanwhile, beta-hydroxyalkylamide and the resin form an ester bond, so that the bonding capability between the modified barium sulfate and the resin is enhanced, in addition, the amide bond and the ester bond form a large number of hydrogen bonds, so that the compatibility between inorganic filler and organic resin in the coating is better, and the whole coating can form a compact integral structure after the coating is prepared. In addition, the flexibility and solvent resistance of the coating can be improved by the macromolecular thermoplastic polyimide serving as the flexibilizer in the coating, so that the coating has excellent mechanical properties. The thermoplastic polyimide has the tensile strength of 100MPa and the impact strength of 260KJ/m 2 The coating can effectively improve the flexibility of the coating, solve the problem of cracking of the coating caused by slight cracking of the aluminum plate substrate in the use process, ensure that the 0T of the coating (60-100 um thickness) is not cracked, and have good T-bend performance. Therefore, the coiled material aluminum plate powder coating has better flexibility and impact resistance than the common coiled material powder coating under the same curing timeT-bend, etc.
2. The carboxyl-terminated polyester resin with higher acid value is selected, the crosslinking density of the whole coating is higher, the reactivity is better, meanwhile, the surface modified barium sulfate is adopted, the compatibility with the resin is better, the scratch of equipment on the coating of the coiled material aluminum plate in the processing process of the coiled material aluminum plate can be prevented from generating marks, and the marks generated by collision in the production process are reduced.
3. The invention starts from the basic formula of the powder coating, has no organic solvent, simple production process, one-time baking and forming, no VOC emission, higher coating thickness, more excellent salt spray resistance and photo aging resistance, longer service life of the base material, environmental protection, energy conservation and the like compared with the electrostatic spraying of coiled building materials and household electrical appliance powder. The coiled material aluminum plate coating prepared by using the powder coating for the coiled material aluminum plate has excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and other performances.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It is also to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, since various modifications and adaptations may be made by those skilled in the art in light of the teachings herein. The specific process parameters and the like described below are also merely examples of suitable ranges, i.e., one skilled in the art can make a selection within the suitable ranges by the description herein and are not intended to be limited to the specific data described below. The starting materials, reagents or apparatus used in the examples and comparative examples were either commercially available from conventional sources or may be obtained by prior art methods unless specifically indicated.
Among them, the carboxyl terminated polyester resin used in examples and comparative examples was NH6381 in the prime day.
The invention is described in detail below with reference to examples and comparative examples, the components of which are shown in Table 1 below, and the amounts of the components in Table 1 are in parts by mass:
TABLE 1 Components and amounts of powder coatings of examples 1-4 and comparative example 1
The powder coatings for coil aluminum plates of examples 1 to 4 and comparative example 1 were prepared as follows:
1) Weighing the components according to the table 2, fully mixing and crushing in a mixing cylinder to obtain a mixed material;
2) And (3) melting, mixing, uniformly dispersing and extruding the mixed material in a double-screw extruder, wherein the temperature of a region I of the extruder is 95-105 ℃, the temperature of a region II of the extruder is 100-105 ℃, tabletting, cooling and crushing the mixed material by a tablet press, crushing the mixed material by a special crusher, and screening the crushed mixed material to obtain the powder coating with the D50 particle size of 25-45 mu m.
The preparation method of the surface modified barium sulfate in examples 1 to 4 is as follows:
1) Placing the barium sulfate powder into a high-speed mixer for rotary drying, wherein the drying temperature is 115-130 ℃, and drying for 60-120 min to obtain barium sulfate powder with the water content lower than 1%;
2) Adding maleic anhydride, hydrogen peroxide and an antioxidant which respectively account for 1% of the weight of the barium sulfate powder into the obtained barium sulfate powder, and then mixing the mixture in a high-speed mixer at the temperature of 75 ℃ for 60-80 min to obtain maleic anhydride modified barium sulfate;
3) Adding 1 percent (weight ratio of the maleic anhydride modified barium sulfate) of an aminosilane coupling agent into the obtained maleic anhydride modified barium sulfate, and reacting for 15-25 min at 110-120 ℃ in a high-speed mixer to obtain the co-modified barium sulfate of the aminosilane coupling agent and the maleic anhydride;
4) 1 percent (mass proportion of the barium sulfate jointly modified by the aminosilane coupling agent and the maleic anhydride) of titanate coupling agent and 1 percent of aluminate coupling agent are respectively added into the barium sulfate jointly modified by the aminosilane coupling agent and the maleic anhydride, the mixture is placed into a high-speed mixer with the temperature of 100-110 ℃ to be mixed for 10-15 min, and butyl stearate is added into the mixture to be mixed for 10-15 min when the temperature is 75 ℃ to obtain the modified barium sulfate with good surface wettability.
Performance test:
the powder coatings prepared in examples 1 to 4 and comparative example 1, commercially available powder coatings for coil building materials (see invention CN106752756 a) and coil powder coatings for household appliances (see invention patent CN 109971318A) were subjected to the following performance tests:
1. gloss was tested according to GB/T9754-2007;
2. pencil hardness was tested according to GB/T6739-2006;
3. impact properties were tested according to GB/T1732-2020;
4. 1000h xenon lamp aging test according to GB/T1865-2009;
5. solvent resistance (MEK) was tested according to GB/T13448-2019;
6. t-bend performance was tested according to GB/T13448-2019;
7. acid and alkali resistance was tested according to GB 9274-1988;
8. appearance was assessed visually;
the results are shown in Table 2:
table 2 results of performance test of powder coatings prepared in examples 1 to 4 and comparative example 1, powder coatings for coil building materials and coil powder coatings for home appliances
As can be seen from the performance test results of the powder coatings prepared in examples 1 to 4 and comparative example 1 in Table 2, the commercially available powder coatings for coil building materials and the household appliance coil powder coatings, the invention adopts the surface modified barium sulfate, has better compatibility with resin, can prevent the coil aluminum plate from scraping the coil aluminum plate coating by equipment in the processing process, reduces the trace generated by collision in the production process, and has the advantages of excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and the like. In addition, the flexibility and solvent resistance of the coating can be improved by the macromolecular thermoplastic polyimide serving as the flexibilizer in the coating, so that the coating has excellent mechanical properties. In addition, the invention starts from the basic formula of the powder coating, has no organic solvent, simple production process, one-time baking and forming, no VOC emission, higher coating thickness, more excellent salt spray resistance and photo aging resistance, longer service life of the base material, environmental protection, energy conservation and the like compared with the electrostatic spraying of coiled building materials and household electrical appliance powder. The coiled material aluminum plate coating prepared by using the powder coating for the coiled material aluminum plate has excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and other performances.
The comparison of the comprehensive performance of the coil aluminum plate powder coating provided by the invention and the comprehensive performance of the household appliance plate powder coating and the coil steel plate powder coating is shown in Table 3:
TABLE 3 comparison of the Properties of the coil aluminum powder coating with the Properties of the household Board powder coating and the coil Steel sheet powder coating
From the comparison in table 3 above, it can be seen that the powder coating prepared by the invention has the advantages of excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and the like.
The powder coating for the coiled material aluminum plate is prepared from various raw material components and raw material proportions through a large number of tests, and has scientific and reasonable proportions. The powder coating for the coiled material aluminum plate, which is obtained by mixing the components of the powder coating and then carrying out melt extrusion, not only can meet the coating process of coiled material, but also has the advantages of excellent thick coating flexibility, T-bend performance, impact resistance, solvent resistance, powdering performance, scratch resistance and the like while meeting the thick coating requirement of the coiled material aluminum plate, and realizes the continuous spraying production of the powder coating for the coiled material aluminum plate in China.
Claims (2)
1. A coil aluminum plate coating, which is characterized in that the coating is formed by a powder coating for coil aluminum plates, wherein the powder coating comprises the following components in parts by mass: 60 to 85 parts of carboxyl-terminated polyester resin, 7 to 10 parts of curing agent, 5 to 20 parts of surface modified barium sulfate, 15 to 35 parts of filler, 0.5 to 10 parts of pigment and 1 to 8 parts of auxiliary agent;
the auxiliary agent comprises at least one of a flexibilizer, a leveling agent, an antioxidant, a degasifying agent and a ventilation agent;
the flexible agent is thermoplastic polyimide;
the acid value of the carboxyl-terminated polyester resin is 45-65 mgKOH/g; the ICI melt viscosity of the carboxyl-terminated polyester resin at 200 ℃ is 3000-5000 mPa.s;
the surface modified barium sulfate is modified by an aminosilane coupling agent and maleic anhydride; in the surface modified barium sulfate, the mass ratio of the barium sulfate to the aminosilane coupling agent to the maleic anhydride is 100: (0.1-5): (0.1 to 5);
the curing agent is beta-hydroxyalkylamide;
the thickness of the coating is 60-100 mu m.
2. The coating of claim 1, wherein, of the components of the powder coating,
the filler comprises at least one of barium sulfate, silica micropowder, mica powder and rutile titanium dioxide.
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| CN106752756A (en) * | 2016-11-11 | 2017-05-31 | 广州擎天材料科技有限公司 | A kind of high speed infrared solidification levelling powdery paints and preparation method thereof |
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