CN111019490A - Polyester type high-gloss water-based aluminum coil coating and preparation method thereof - Google Patents
Polyester type high-gloss water-based aluminum coil coating and preparation method thereof Download PDFInfo
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- 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
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention provides a polyester type high-gloss water-based aluminum coil coating, which comprises the following components: 40-70 parts of water-based polyester resin; 15-30 parts of pigment and filler; 3-8 parts of amino resin; 0.1-0.5 parts by weight of a dispersant; 0.1-0.6 parts by weight of a base material wetting agent; 0-0.5 parts of a leveling agent; 2-5 parts of a cosolvent; 1-5 parts of water-based adhesive force auxiliary agent; 0.1-0.5 parts by weight of an acid catalyst; 5-26.4 parts of water. Compared with the prior art, the aluminum plate can be quickly cured at the temperature of 200-250 ℃ by designing proper amino ratio, color ratio and the like, has the characteristics of high hardness, good adhesive force, good flexibility, high luminosity, excellent scratch resistance and the like, has the characteristics of easy dispersion, excellent leveling property and the like by taking water as a diluent, belongs to an aqueous aluminum coil coating, belongs to a low VOC product, and has the characteristics of environmental protection and green.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a polyester type high-gloss water-based aluminum coil coating and a preparation method thereof.
Background
The aluminum rolling coating is prepared by coating the coating on the surface of an aluminum material by a roller coating operation method, and then the aluminum rolling coating is prepared into a color-coated aluminum plate, has the advantages of high mechanical strength, good flexibility and easy processing and forming, has good decoration and corrosion resistance, and can be easily subjected to processing such as blanking, bending, deep drawing and the like. The product has light weight, excellent performance and low cost, and may be used widely in industrial factory building, station, airport, gymnasium, high-grade building and other building and household appliance industry.
The aluminum coil coating generally adopts a single-coating and one-baking process, the front side is coated with primer, the primer provides adhesion, flexibility and corrosion resistance, and in addition, the aluminum coil coating also needs to have good interlayer adhesion and matching property with finish paint; the finish paint can be used in high-grade or high-demand occasions.
Because the coiled aluminum coating is subjected to high-temperature rapid baking during coating, and a coated plate is uncoiled and directly subjected to various mechanical processing such as cutting, occlusion and the like during use, the coiled aluminum coating is required to have good stability, mechanical properties and excellent adhesion to a base material. At present, the solvent type coiled aluminum coating with excellent comprehensive performance occupies the absolute position of the coiled aluminum coating. However, the traditional solvent type coil aluminum coating and coil aluminum coating process cause industrial pollution such as discharge of hexavalent chromium for passivation, formaldehyde, benzene series, malodorous toxic gas and industrial wastewater in the solvent type coil aluminum coating, so that the serious pollution of industrial environment and social environment is caused, the living environment of human is damaged, and the life health of human is harmed.
The existing coating for the aluminum coil comprises two types of primers, namely polyester-amino primer and acrylic acid-amino primer according to different film-forming resins. The common polyester primer is relatively cheap and has good flexibility, but relatively poor adhesive force and salt mist resistance; the acrylic primer has strong salt spray resistance, outstanding comprehensive performance and relatively poor adhesive force. And both are mainly solvent-based, are difficult to meet the requirements of the national ministry of environmental protection on the content standard of Volatile Organic Compounds (VOC), and have great influence on the environment and the physical and mental health of human beings.
With the increasing environmental protection situation and the collection of VOC emission cost all over the country, the research of the high-performance water-based aluminum coil coating becomes a new research hotspot in the coating field, and simultaneously, with the development of the pre-coated aluminum coil coating technology towards the direction of ultra-long service life, product functionalization and environmental friendliness, the development of new application fields is not broken, and the water-based aluminum coil coating with good adhesive force, good flexibility and excellent scratch resistance is urgently needed to be provided.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a water-based aluminum coil coating with good adhesion, good flexibility and excellent scratch resistance.
The invention provides a polyester type high-gloss water-based aluminum coil coating, which comprises the following components:
preferably, the viscosity of the water-based polyester resin is 300-2000 mPas; the pH value is 6.5-7.5; the solid content is 40-60 wt%; the solid content of the amino resin is 80-100 wt%; the amino resin is selected from fully methylated amino resin and/or partially methylated amino resin.
Preferably, the aqueous polyester resin is selected from LH-J05 and/or Lanxin LX1632 from Boxing Li Jingui New materials Ltd; the amino resin is selected from one or more of CYMEL325, CYMEL303, CYMEL308 and CYMEL 385.
Preferably, the pigment and filler is selected from one or more of rutile type titanium dioxide, barium sulfate, talcum powder, calcined kaolin and wet-process sericite powder.
Preferably, the dispersant is selected from one or more of polyurethane type, acrylic type and carboxylate type dispersants; the substrate wetting agent is selected from one or more of polyether siloxane, high molecular weight block copolymer, nonionic surfactant and anionic surfactant; the leveling agent is selected from one or more of acrylate leveling agents, polyether siloxane leveling agents and non-silicon leveling agents.
Preferably, the dispersant is selected from one or more of BYK190, Dego755W, Dego760W and modesty FX 600; the substrate wetting agent is selected from one or more of BYK190, Dego270, Dego245 and D.E. W-77; the leveling agent is selected from one or more of PW336, Dego410, Dego450 and Efka 3777.
Preferably, the cosolvent is selected from one or more of ethanol, n-butanol, ethylene glycol butyl ether and propylene glycol methyl ether; the aqueous adhesion promoter is selected from Lubrizol2063 and/or Lubrizol 2062; the acid catalyst is selected from one or more of BD7732, BD7722 and BD 7719.
Preferably, the method comprises the following steps:
preferably, the polyester type high-gloss water-based aluminum coil coating is cured at the temperature of 200-250 ℃ for 20-30 s.
The invention also provides a preparation method of the polyester type high-gloss water-based aluminum coil coating, which comprises the following steps:
mixing 40-70 parts by weight of water-based polyester resin, 2-5 parts by weight of cosolvent, 0.1-0.5 part by weight of dispersant, 0.1-0.6 part by weight of base material wetting agent, 0-0.5 part by weight of flatting agent, 1-5 parts by weight of water-based adhesion promoter and 5-26.4 parts by weight of water, stirring at low speed, adding 15-30 parts by weight of pigment and filler, 3-8 parts by weight of amino resin and 0.1-0.5 part by weight of acid catalyst, and uniformly dispersing at high speed to obtain the polyester type high-gloss water-based aluminum rolling coating.
The invention provides a polyester type high-gloss water-based aluminum coil coating, which comprises the following components: 40-70 parts of water-based polyester resin; 15-30 parts of pigment and filler; 3-8 parts of amino resin; 0.1-0.5 parts by weight of a dispersant; 0.1-0.6 parts by weight of a base material wetting agent; 0-0.5 parts of a leveling agent; 2-5 parts of a cosolvent; 1-5 parts of water-based adhesive force auxiliary agent; 0.1-0.5 parts by weight of an acid catalyst; 5-26.4 parts of water. Compared with the prior art, the aluminum plate can be quickly cured at the temperature of 200-250 ℃ by designing proper amino ratio, color ratio and the like, has the characteristics of high hardness, good adhesive force, good flexibility, high luminosity, excellent scratch resistance and the like, has the characteristics of easy dispersion, excellent leveling property and the like by taking water as a diluent, belongs to an aqueous aluminum coil coating, belongs to a low VOC product, and has the characteristics of environmental protection and green.
Experimental results show that the polyester type high-gloss water-based aluminum coil coating provided by the invention comprises the following components in percentage by weight: the hardness of the pencil reaches 3H no scratch of the Chinese pencil; the cross-cut method adhesion in the adhesion aspect is 0 grade; the flexibility can reach 1T without stripping on the T bend; the gloss can reach more than 90 degrees at 60 degrees; and (3) scratch resistance: an aluminum plate is used for carrying out a scratch test, so that the surface of a paint film is not scratched and has higher smoothness; the thickness of the dry film in the salt spray resistant time is 17-20 mu m, the salt spray resistant time of the pretreated common aluminum plate can reach 4000h, and the technical requirements of the aluminum veneer for decoration are met.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a polyester type high-gloss water-based aluminum coil coating, which comprises the following components:
the polyester type high-gloss water-based aluminum coil coating provided by the invention takes water-based polyester resin as a main film forming substance; the content of the water-based polyester resin is preferably 45-65 parts by weight, more preferably 45-60 parts by weight, and further preferably 45-55 parts by weight; in some embodiments provided herein, the waterborne polyester resin is preferably present in an amount of 45 parts by weight; in some embodiments provided herein, the waterborne polyester resin is preferably present in an amount of 50 parts by weight; in other embodiments provided herein, the waterborne polyester resin is preferably present in an amount of 55 parts by weight; the viscosity of the water-based polyester resin is preferably 300-2000 mPas; the pH value is preferably 6.5-7.5; the solid content is preferably 40-60 wt%; in the present invention, the aqueous polyester resin is most preferably LH-J05 and/or Lanxin LX1632 from Boxing Li Jingui New materials, Inc.
Using pigment and filler as a secondary film forming material; the content of the pigment and the filler is preferably 20-30 parts by weight, more preferably 20-25 parts by weight, and still more preferably 20 parts by weight; the pigment and filler is preferably one or more of rutile titanium dioxide, barium sulfate, talcum powder, calcined kaolin and wet sericite powder; the pigment and filler is also called extender pigment and mainly has the main functions of filling the coating film to increase the thickness of the coating film, improve the durability, the hardness and the like of the coating film, also can enable the coating film to have various required colors and provide certain covering power, and has certain influence on the performance of the coating film.
Amino resin is taken as a cross-linking agent; the content of the amino resin is preferably 4 to 7 parts by weight, and more preferably 5 to 6 parts by weight; the amino resin is preferably fully methylated amino resin and/or partially methylated amino resin, and more preferably one or more of CYMEL325, CYMEL303, CYMEL308 and CYMEL 385. The amino resin as a crosslinking agent can provide good flexibility and formability to the paint film.
The polyester type high-gloss water-based aluminum coil coating provided by the invention comprises a dispersing agent for dispersing pigments and fillers, wherein the content of the dispersing agent is preferably 0.2-0.4 part by weight, and more preferably 0.2-0.3 part by weight; the dispersant is preferably one or more of polyurethane type, acrylic type and carboxylate type dispersants, and more preferably one or more of BYK190, Dego755W, Dego760W and modesty FX 600.
The content of the base material wetting agent is preferably 0.1 to 0.5 weight part, more preferably 0.2 to 0.4 weight part, and still more preferably 0.2 weight part; the substrate wetting agent is preferably one or more of polyether siloxane, high molecular weight block copolymer, nonionic surfactant and anionic surfactant, more preferably one or more of BYK190, Dego270, Dego245 and modesty W-77; the addition of a substrate wetting agent is used to improve the surface tension and permeability of the coating, so that the coating can better wet the substrate, thereby improving the adhesion of the coating.
In order to enhance the fluidity of the coating, a leveling agent can be added into the polyester type high-gloss water-based aluminum coil coating, and the content of the leveling agent is preferably 0.1-0.3 part by weight, more preferably 0.1-0.2 part by weight, and further preferably 0.1 part by weight; the leveling agent is preferably one or more of an acrylate leveling agent, a polyether siloxane leveling agent and a non-silicon leveling agent, and more preferably one or more of PW336, Dego410, Dego450 and Efka 3777. The leveling agent can promote the coating to form a flat, smooth and uniform coating film in the process of drying and film forming.
In order to fully dissolve resin and pigment and filler, a cosolvent is added into the polyester type high-gloss water-based aluminum coil coating; the content of the cosolvent is preferably 2-4 parts by weight, more preferably 2-3 parts by weight, and further preferably 2 parts by weight; the cosolvent is preferably an alcohol solvent and/or an alcohol ether solvent, and is more preferably one or more of ethanol, n-butanol, ethylene glycol butyl ether and propylene glycol methyl ether.
The invention also adds the water-based adhesion promoter which can also be called as water-based adhesion promoter to improve the binding force between the base materials of the paint film of the coating, improve the chemical resistance of the paint film and solve the phenomena of paint falling and the like in the coating process; the content of the water-based adhesion promoter is preferably 1-3 parts by weight, more preferably 1-2 parts by weight, and further preferably 1 part by weight; the aqueous adhesion promoter is preferably Lubrizol2063 and/or Lubrizol 2062.
The content of the acid catalyst is preferably 0.1 to 0.4 part by weight, more preferably 0.1 to 0.3 part by weight, and still more preferably 0.1 to 0.2 part by weight; the acid catalyst is preferably one or more of BD7732, BD7722 and BD 7719. The acid catalyst can be added into resin to form a film, so that the curing time is shortened.
The polyester type high-gloss water-based aluminum coil coating provided by the invention takes water as a diluent; the water content is preferably 10 to 26.4 parts by weight, more preferably 15 to 26.4 parts by weight, still more preferably 20 to 26.4 parts by weight, and most preferably 20.4 to 26.4 parts by weight.
The polyester type high-gloss water-based aluminum coil coating provided by the invention is preferably cured at the temperature of 200-250 ℃ for 20-30 s.
The aluminum plate can be quickly cured at the temperature of 200-250 ℃ of the aluminum plate by designing proper amino ratio, color ratio and the like, has the characteristics of high hardness, good adhesive force, good flexibility, high luminosity, excellent scratch resistance and the like, has the characteristics of easy dispersion, excellent leveling property and the like by taking water as a diluent, belongs to a water-based aluminum rolling coating, belongs to a low VOC product, and has the characteristics of environmental protection and green.
The invention also provides a preparation method of the polyester type high-gloss water-based aluminum coil coating, which comprises the following steps: mixing 40-70 parts by weight of water-based polyester resin, 2-5 parts by weight of cosolvent, 0.1-0.5 part by weight of dispersant, 0.1-0.6 part by weight of base material wetting agent, 0-0.5 part by weight of flatting agent, 1-5 parts by weight of water-based adhesion promoter and 5-26.4 parts by weight of water, stirring at low speed, adding 15-30 parts by weight of pigment and filler, 3-8 parts by weight of amino resin and 0.1-0.5 part by weight of acid catalyst, and uniformly dispersing at high speed to obtain the polyester type high-gloss water-based aluminum rolling coating.
Wherein, the sources of all raw materials are not specially limited and can be sold in the market; the aqueous polyester resin, the cosolvent, the dispersant, the substrate wetting agent, the leveling agent, the aqueous adhesion auxiliary agent, the water, the pigment filler, the amino resin and the acid catalyst are the same as those described above, and are not described again.
Mixing 40-70 parts by weight of water-based polyester resin, 2-5 parts by weight of cosolvent, 0.1-0.5 part by weight of dispersant, 0.1-0.6 part by weight of base material wetting agent, 0-0.5 part by weight of flatting agent, 1-5 parts by weight of water-based adhesion promoter and 5-26.4 parts by weight of water, and stirring at a low speed; the low-speed stirring is preferably carried out in a disperser; the rotation speed of the low-speed stirring is preferably 500-800 revolutions per minute, more preferably 500-750 revolutions per minute, and still more preferably 500-690 revolutions per minute.
After uniformly stirring at a low speed, adding 15-30 parts by weight of pigment and filler, 3-8 parts by weight of amino resin and 0.1-0.5 part by weight of acid catalyst, and uniformly dispersing at a high speed; the high-speed dispersion is preferably carried out in a disperser; the rotation speed of the high-speed dispersion is preferably 1500-2000 rpm, more preferably 1500-1850 rpm, and still more preferably 1600-1760 rpm.
After high-speed dispersion is uniform, grinding is preferably carried out to obtain the polyester type high-gloss water-based aluminum coil coating; the grinding is preferably carried out by a basket type sand mill; the grinding temperature is preferably controlled to be less than 50 ℃; the grinding is preferably to a fineness of less than 20 μm.
The polyester type high-gloss water-based aluminum coil coating prepared by the invention uses water as a dispersion medium, so that the product is really water-based, the environment-friendly coating is green, convenient to construct by using a water diluent, and the performance of the coating reaches or exceeds that of a solvent-based primer, and the coating has excellent T-bend, 90-degree bend, forward impact resistance, solvent wiping resistance, scratch resistance and the like, and fills the blank of the domestic water-based aluminum coil coating.
In order to further illustrate the present invention, the polyester type high gloss water-based aluminum coil coating and the preparation method thereof provided by the present invention are described in detail below with reference to the examples.
The reagents used in the following examples are commercially available, and unless otherwise specified, the parts in the examples are parts by weight; in the embodiment, the base materials used for detection are common aluminum plates, the thickness of the base materials is 0.5mm, and the base materials are subjected to the pretreatment processes of degreasing, washing, drying and passivation; the dry film thickness of all the single-layer coatings is controlled to be 17-20 mu m; the detection standards are all carried out according to the national detection standards.
Example 1
45 parts of lijinhui LH-J05 aqueous polyester resin, 2 parts of cosolvent propylene glycol methyl ether, 0.2 part of BYK190 dispersant, 0.2 part of humble W77 substrate wetting agent, 0.1 part of digao 450 leveling agent, 1 part of Luborun 2043 aqueous adhesive force auxiliary agent and 26.4 parts of water are mixed, and the mixture is stirred uniformly at a low speed by a dispersion machine (the rotating speed is 500 revolutions per minute); then adding 20 parts of python R996 titanium dioxide, 5 parts of 325 amino resin and 0.1 part of BD7719 drier, dispersing uniformly at high speed (the rotating speed is 1500 rpm) by using a dispersion machine, grinding by using a basket type sand mill until the fineness is less than 20 mu m, and controlling the grinding temperature to be less than 50 ℃ to obtain the polyester type highlight water-based aluminum coil coating.
The performance of the polyester type high-gloss water-based aluminum coil coating obtained in example 1 was tested, and the test results are shown in table 1.
Table 1 example 1 polyester type high gloss water based aluminum coil coating performance test results
| Performance of | Example 1 | Detection standard |
| Salt spray resistance time/h | 3500 | GB/T1771 |
| T-bend | 2T | HG/T3830-2006 appendix B |
| Adhesion force | 0 | GB/T9286-1998 |
| Hardness of | 3H | ISO15184:1998 |
| VOC/mg/L | <20 | GB/T23986-2009 |
| Gloss of | 90 | GB/T9754 |
| Diluent | Water (W) | / |
Example 2
55 parts of lijinhui LH-J05 aqueous polyester resin, 2 parts of cosolvent ethylene glycol monobutyl ether, 0.3 part of a moderate FX600 dispersant, 0.2 part of a digao 245 substrate wetting agent, 0.1 part of a digao 450 leveling agent, 1 part of Luborun 2043 aqueous adhesive force additive and 26.4 parts of water are mixed, and the mixture is stirred uniformly at a low speed (the rotating speed is 600 revolutions per minute) by a dispersion machine; then adding 20 parts of boa R996 titanium dioxide, 5 parts of 303 amino resin and 0.2 part of BD7722 drier, dispersing uniformly at high speed (rotating speed 1600 rpm) by using a dispersion machine, grinding by using a basket type sand mill until the fineness is less than 20 mu m, and controlling the grinding temperature to be less than 50 ℃ to obtain the polyester type high-gloss water-based aluminum coil coating.
The performance of the polyester type high-gloss water-based aluminum coil coating obtained in example 2 was tested, and the test results are shown in table 2.
Table 2 example 1 polyester type high gloss water based aluminum coil coating performance test results
Example 3
50 parts of lijinhui LH-J06 aqueous polyester resin, 2 parts of cosolvent propylene glycol monomethyl ether, 0.2 part of digao 760W dispersant, 0.2 part of humble W77 substrate wetting agent, 0.1 part of digao 410 flatting agent, 1 part of Luborun 2042 aqueous adhesive force additive and 20.4 parts of water are mixed, and the mixture is stirred uniformly at a low speed by a dispersion machine (the rotating speed is 750 revolutions per minute); then adding 20 parts of Dongjia SR237 titanium dioxide, 6 parts of Zhanxin 385 amino resin and 0.1 part of BD7732 drier, uniformly dispersing at high speed by using a dispersion machine (rotating speed of 1850 r/min), and grinding by using a basket type sand mill until the fineness is less than 20 mu m, wherein the grinding temperature is controlled to be less than 50 ℃ to obtain the polyester type high-gloss water-based aluminum coil coating.
The performance of the polyester type high-gloss water-based aluminum coil coating obtained in example 3 was tested, and the test results are shown in table 3.
Table 3 example 3 polyester type high gloss water based aluminum coil coating performance test results
| Performance of | Example 3 | Detection standard |
| Salt spray resistance time/h | 2500 | GB/T1771 |
| T-bend | 2T | HG/T3830-2006 appendix B |
| Adhesion force | 0 | GB/T9286-1998 |
| Hardness of | 2H | ISO15184:1998 |
| VOC/mg/L | <20 | GB/T23986-2009 |
| Gloss of | 91.4 | GB/T9754 |
| Diluent | Water (W) | / |
Example 4
55 parts of a lighihui LH-J06 aqueous polyester resin, 1 part of cosolvent propylene glycol monomethyl ether, 0.2 part of a Digao 755W dispersant, 0.4 part of a moderate W77 substrate wetting agent, 0.2 part of a Diehuka 3777 flatting agent, 1 part of Luobou 2042 aqueous adhesion promoter and 13.1 parts of water are mixed and stirred uniformly at a low speed by a dispersion machine (the rotating speed is 690 revolutions per minute); then adding 22 parts of Dongjia SR237 titanium dioxide, 7 parts of Zhanxin 303 amino resin and 0.1 part of BD7722 drier, dispersing uniformly at a high speed by using a dispersion machine (rotating speed of 1760 r/min), grinding by using a basket type sand mill until the fineness is less than 20 mu m, and controlling the grinding temperature to be less than 50 ℃ to obtain the polyester type high-gloss water-based aluminum coil coating.
The performance of the polyester type high-gloss water-based aluminum coil coating obtained in example 4 was tested, and the test results are shown in table 4.
TABLE 4 coil aluminum coating Performance test results
The commercial waterborne coil aluminum coating manufacturers and designations in table 4: roll aluminum coating, Huangshan Jiaborui science and technology ltd; commercial solvent-based coiled aluminum coating manufacturers and brands: jiangsu Haifeng New materials Co., Ltd, coil aluminum coating.
As can be seen from tables 1 to 4, the hardness reaches the level of the Chinese pencil 3H without scratches; the adhesion of the substrate is 0 grade; the T bend can reach 1T without peeling; salt spray resistance time: the thickness of the water-based coiled aluminum dry film is 17-20 mu m, the salt spray resistance time of a pretreated common aluminum plate can reach 4000h, which is far higher than that of a water-based coiled aluminum coating product sold in the market, and the product performance of the water-based coiled aluminum coating product is almost consistent with that of an oil-based coiled aluminum coating product; the water-based aluminum coil belongs to a low VOC product (less than 20mg/L) in a water-based paint, and has the characteristics of environmental protection and green.
Comparative example 1
55 parts of a lighihui LH-J06 aqueous polyester resin, 1 part of cosolvent propylene glycol monomethyl ether, 0.2 part of a Digao 755W dispersant, 0.4 part of a moderate W77 substrate wetting agent, 0.2 part of a Diehuka 3777 flatting agent, 1 part of Luobou 2042 aqueous adhesion promoter and 16.1 parts of water are mixed and uniformly stirred at a low speed by a dispersion machine (the rotating speed is 690 revolutions per minute); then adding 22 parts of Dongjia SR237 titanium dioxide, 10 parts of Zhanxin 303 amino resin and 0.1 part of BD7722 drier, dispersing uniformly at a high speed by using a dispersion machine (rotating speed of 1760 r/min), grinding by using a basket type sand mill until the fineness is less than 20 mu m, and controlling the grinding temperature to be less than 50 ℃ to obtain the polyester type high-gloss water-based aluminum coil coating.
Comparative example 2
50 parts of lijinhui LH-J06 aqueous polyester resin, 2 parts of cosolvent propylene glycol monomethyl ether, 0.2 part of Digao 760W dispersant, 0.2 part of moderate W77 substrate wetting agent, 0.1 part of Digao 410 flatting agent, 1 part of Luobou 2042 aqueous adhesive force additive and 23.4 parts of water are mixed and stirred uniformly at a low speed by a dispersion machine (the rotating speed is 750 revolutions per minute); then adding 20 parts of Dongjia SR237 titanium dioxide, 3 parts of Zhanxin 385 amino resin and 0.1 part of BD7732 drier, uniformly dispersing at high speed by using a dispersion machine (rotating speed of 1850 r/min), and grinding by using a basket type sand mill until the fineness is less than 20 mu m, wherein the grinding temperature is controlled to be less than 50 ℃ to obtain the polyester type high-gloss water-based aluminum coil coating.
The polyester type high gloss water based aluminum coil coating materials obtained in comparative example 1 and comparative example 2 were analyzed, and the performance test results thereof are shown in table 5.
TABLE 5 coil aluminum coating Performance test results
| Performance of | Comparative example 1 | Comparative example 2 | Detection standard |
| Salt spray resistance time/h | 5000 | 3000 | GB/T1771 |
| T-bend | 3T | 1T | HG/T3830-2006 appendix B |
| Adhesion force | 1 | 0 | GB/T9286-1998 |
| Hardness of | 4H | 2H | ISO15184:1998 |
As can be seen from Table 5, the amino ratio is low, the salt spray resistance time and hardness are increased, but the T-bend performance is reduced; the amino ratio is high, the salt spray resistance time and the hardness are reduced, but the T-bend performance is improved.
Comparative example 3
Mixing 65 parts of lijinhui LH-J06 aqueous polyester resin, 1 part of cosolvent propylene glycol monomethyl ether, 0.2 part of Diga755W dispersant, 0.4 part of moderate W77 substrate wetting agent, 0.2 part of Diehuka 3777 flatting agent, 1 part of Luborun 2042 aqueous adhesive force additive and 6.1 parts of water, and stirring uniformly at low speed by using a dispersion machine (the rotating speed is 690 revolutions per minute); then adding 22 parts of Dongjia SR237 titanium dioxide, 10 parts of Zhanxin 303 amino resin and 0.1 part of BD7722 drier, dispersing uniformly at a high speed by using a dispersion machine (rotating speed of 1760 r/min), grinding by using a basket type sand mill until the fineness is less than 20 mu m, and controlling the grinding temperature to be less than 50 ℃ to obtain the polyester type high-gloss water-based aluminum coil coating.
Comparative example 4
35 parts of lijinhui LH-J06 aqueous polyester resin, 2 parts of cosolvent propylene glycol methyl ether, 0.2 part of digao 760W dispersant, 0.2 part of humble W77 substrate wetting agent, 0.1 part of digao 410 flatting agent, 1 part of Luborun 2042 aqueous adhesive force additive and 28.4 parts of water are mixed and stirred uniformly at a low speed by a dispersion machine (the rotating speed is 750 revolutions per minute); then adding 30 parts of Dongjia SR237 titanium dioxide, 3 parts of Zhanxin 385 amino resin and 0.1 part of BD7732 drier, uniformly dispersing at high speed by using a dispersion machine (rotating speed of 1850 r/min), and grinding by using a basket type sand mill until the fineness is less than 20 mu m, wherein the grinding temperature is controlled to be less than 50 ℃ to obtain the polyester type high-gloss water-based aluminum coil coating.
The polyester type high gloss water based aluminum coil coating materials obtained in comparative examples 3 and 4 were analyzed, and the results of performance test thereof are shown in table 6.
TABLE 6 aluminum paint Performance test results
| Performance of | Comparative example 3 | Comparative example 4 | Detection standard |
| Salt spray resistance time/h | 5000 | 2000 | GB/T1771 |
| T-bend | 1T | 3T | HG/T3830-2006 appendix B |
| Adhesion force | 0 | 1 | GB/T9286-1998 |
| Hardness of | 1H | 2H | ISO15184:1998 |
| Gloss of | 94 | 85 | GB/T9754 |
As can be seen from Table 6, the base ratio was low, the salt spray resistance time and gloss were improved, but the hardness was reduced; high aspect ratio, reduced salt spray resistance time and gloss, and reduced T-bend performance.
Claims (10)
1. A polyester type high-gloss water-based aluminum coil coating is characterized by comprising:
2. the polyester type high-gloss water-based aluminum coil coating material as claimed in claim 1, wherein the viscosity of the water-based polyester resin is 300 to 2000 mPa-s; the pH value is 6.5-7.5; the solid content is 40-60 wt%; the solid content of the amino resin is 80-100 wt%; the amino resin is selected from fully methylated amino resin and/or partially methylated amino resin.
3. The polyester type high gloss aqueous aluminum coil coating according to claim 1, wherein the aqueous polyester resin is selected from LH-J05 and/or lanxin LX1632 of bosch leigh kov; the amino resin is selected from one or more of CYMEL325, CYMEL303, CYMEL308 and CYMEL 385.
4. The polyester type high-gloss water-based aluminum coil coating material as claimed in claim 1, wherein the pigment and filler is selected from one or more of rutile titanium dioxide, barium sulfate, talc, calcined kaolin and wet sericite powder.
5. The polyester type high-gloss water-based aluminum coil coating material according to claim 1, wherein the dispersant is one or more selected from polyurethane type, acrylic type and carboxylate type dispersants; the substrate wetting agent is selected from one or more of polyether siloxane, high molecular weight block copolymer, nonionic surfactant and anionic surfactant; the leveling agent is selected from one or more of acrylate leveling agents, polyether siloxane leveling agents and non-silicon leveling agents.
6. The polyester type high-gloss water-based aluminum coil coating according to claim 1, wherein the dispersant is selected from one or more of BYK190, Dego755W, Dego760W and a D.E. FX 600; the substrate wetting agent is selected from one or more of BYK190, Dego270, Dego245 and D.E. W-77; the leveling agent is selected from one or more of PW336, Dego410, Dego450 and Efka 3777.
7. The polyester type high-gloss water-based aluminum coil coating material as claimed in claim 1, wherein the cosolvent is selected from one or more of ethanol, n-butanol, ethylene glycol butyl ether and propylene glycol methyl ether; the aqueous adhesion promoter is selected from Lubrizol2063 and/or Lubrizol 2062; the acid catalyst is selected from one or more of BD7732, BD7722 and BD 7719.
8. The polyester type high-gloss water-based aluminum coil coating material according to claim 1, comprising:
9. the polyester type high-gloss water-based aluminum coil coating as claimed in claim 1, wherein the polyester type high-gloss water-based aluminum coil coating is cured at an aluminum plate temperature of 200-250 ℃ for 20-30 s.
10. A preparation method of polyester type high-gloss water-based aluminum coil coating is characterized by comprising the following steps:
mixing 40-70 parts by weight of water-based polyester resin, 2-5 parts by weight of cosolvent, 0.1-0.5 part by weight of dispersant, 0.1-0.6 part by weight of base material wetting agent, 0-0.5 part by weight of flatting agent, 1-5 parts by weight of water-based adhesion promoter and 5-26.4 parts by weight of water, stirring at low speed, adding 15-30 parts by weight of pigment and filler, 3-8 parts by weight of amino resin and 0.1-0.5 part by weight of acid catalyst, and uniformly dispersing at high speed to obtain the polyester type high-gloss water-based aluminum rolling coating.
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