CN113789107A - Preparation method of reflective coating for outdoor pre-coiled steel plate - Google Patents
Preparation method of reflective coating for outdoor pre-coiled steel plate Download PDFInfo
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- CN113789107A CN113789107A CN202111228657.XA CN202111228657A CN113789107A CN 113789107 A CN113789107 A CN 113789107A CN 202111228657 A CN202111228657 A CN 202111228657A CN 113789107 A CN113789107 A CN 113789107A
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- 238000000576 coating method Methods 0.000 title claims abstract description 22
- 239000011248 coating agent Substances 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 15
- 239000010959 steel Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims description 6
- 239000002904 solvent Substances 0.000 claims abstract description 44
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229920001225 polyester resin Polymers 0.000 claims abstract description 17
- 239000004645 polyester resin Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- 238000009736 wetting Methods 0.000 claims abstract description 9
- 229920003180 amino resin Polymers 0.000 claims abstract description 8
- 239000003377 acid catalyst Substances 0.000 claims abstract description 7
- 238000004040 coloring Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 12
- 239000004408 titanium dioxide Substances 0.000 claims description 11
- 238000011010 flushing procedure Methods 0.000 claims description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 claims description 6
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 5
- 239000001023 inorganic pigment Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 150000007519 polyprotic acids Polymers 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 150000005846 sugar alcohols Polymers 0.000 claims description 4
- JHRDMNILWGIFBI-UHFFFAOYSA-N 6-diazenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(N=N)=N1 JHRDMNILWGIFBI-UHFFFAOYSA-N 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- LIKFHECYJZWXFJ-UHFFFAOYSA-N dimethyldichlorosilane Chemical compound C[Si](C)(Cl)Cl LIKFHECYJZWXFJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 3
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 2
- 238000006068 polycondensation reaction Methods 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 229910021485 fumed silica Inorganic materials 0.000 claims 1
- 239000000080 wetting agent Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 10
- 235000010215 titanium dioxide Nutrition 0.000 abstract description 10
- 238000010276 construction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012643 polycondensation polymerization Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- 229920003275 CYMEL® 325 Polymers 0.000 description 1
- 241000544076 Whipplea modesta Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical group FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000011179 visual inspection Methods 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
- C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C09D5/004—Reflecting paints; Signal paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The reflective coating comprises the following raw materials of 20-24 parts of polyester resin, 1.5-2.5 parts of solvent A, 1.5-2.5 parts of solvent B, 0.3-0.5 part of wetting dispersant, 0.2-0.5 part of silica micropowder, 18-20 parts of micron-sized titanium white, 5-8 parts of reflective powder, 0.3-0.6 part of coloring toner, 5-6 parts of solvent C, 25-28 parts of polyester resin, 5-6 parts of amino resin, 0.2-0.4 part of acid catalyst, 0.8-1.2 parts of solvent D, 0.5-1 part of leveling assistant and 1-1.5 parts of solvent A. The reflective coating prepared by the invention has the night reflective effect while meeting the processing performance of coil steel, thereby attracting the attention of people and avoiding accidents; the coating can be uniformly coated at one time, and the construction is very simple and convenient; the coating film has rigidity and flexibility, and has excellent processing forming and durable stain resistance.
Description
Technical Field
The invention relates to the field of coatings, in particular to a reflective coating for an outdoor pre-coiled steel plate and a preparation method thereof.
Background
In the construction range of roads, railways, municipal works, real estate, buildings and the like, a fence construction baffle is often needed to isolate a construction site, and the measure can effectively maintain the attractiveness of the city and ensure the safety of people in trip. However, in dark places at night, people are very easy to collide with the construction baffle to cause accidents because the sight is obstructed.
The construction baffle is usually formed by processing and molding a pre-coiled steel plate, so that it is necessary to develop a reflective coating for outdoor pre-coiled steel plates. The reflective coating can enable the baffle to have a reflective function, and can return direct light from a remote place to the original way at dark places at night, so that the effect of the light emitting is achieved, people's attention is attracted, and accidents are avoided.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the reflective coating for the outdoor pre-coiled steel plate, which has excellent night reflective effect, processing and forming performance and good lasting stain resistance.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a reflective coating for outdoor pre-coiled steel plates comprises the following steps:
1) adding 20-24 parts of polyester resin into a clean dispersion cylinder, slowly and sequentially adding 1.5-2.5 parts of solvent A, 1.5-2.5 parts of solvent B, 0.3-0.5 part of wetting dispersant and 0.2-0.5 part of silica micropowder at a stirring speed of 350-550 r/min, gradually increasing the rotating speed to 800-1000 r/min, and stirring for 10-15 minutes;
2) then keeping the rotating speed, adding 18-20 parts of micron-sized titanium dioxide, 5-8 parts of reflective powder and 0.3-0.6 part of coloring toner, increasing the rotating speed to 1300-1450 r/min, and stirring for 15-20 minutes;
3) pouring the slurry stirred in the step 2) into a grinding machine for high-speed grinding, pouring the slurry into a clean dispersion cylinder when the slurry is ground to the fineness of below 30 micrometers, flushing the grinding machine by using 5-6 parts of solvent C, and merging the flushing liquid into the clean dispersion cylinder;
4) slowly increasing the rotating speed to 550-650 r/min, slowly and sequentially adding 25-28 parts of polyester resin, 5-6 parts of amino resin, 0.2-0.4 part of acid catalyst, 0.8-1.2 parts of solvent D and 0.5-1 part of leveling assistant after stirring for 5-10 minutes, and adding 1-1.5 parts of solvent A after stirring for 10-15 minutes to dilute to proper viscosity.
Preferably, the polyester resin is a saturated polyester resin obtained by polycondensation of a polybasic acid and a polyhydric alcohol, and has excellent properties of both flexibility and hardness, good adhesion to metals, and good weather resistance.
Preferably, the solvent A is butyl acetate with relatively fast volatilization rate; solvent B is xylene with a slightly slower volatilization rate than butyl acetate; the solvent C is propylene glycol methyl ether acetate with relatively slow volatilization rate; solvent D is n-butanol which volatilizes at a slightly slower rate than xylene.
Preferably, the silicon dioxide micropowder is hydrophobic gas-phase silicon dioxide treated by dimethyldichlorosilane, so that the rheological property and thixotropy of a system can be controlled, and paint can be prevented from settling or sagging.
Preferably, the micron-sized titanium dioxide is rutile titanium dioxide inorganic pigment produced by a sulfuric acid method processing technology, and the average particle diameter of the micron-sized titanium dioxide inorganic pigment is 260-300 nm.
Preferably, the reflective powder is produced by glass bead powder materials, does not contain soluble barium components, has high refractive index, and has the mesh number of 700-800 meshes.
Preferably, the amino resin is methyl etherified high imino melamine containing isobutanol solvent, has high reactivity and has higher self-condensation tendency.
Preferably, the leveling assistant is fluorocarbon modified polyacrylate, has effective shrinkage cavity resistance, has no foam stabilizing effect, and can be compatible with most solvent-type resins.
Preferably, the wetting dispersant is a copolymer solution with an acid group, can effectively stabilize inorganic powder, especially titanium dioxide, and can effectively reduce the viscosity of the slurry. The acid catalyst is used for rapid curing reaction, and is helpful for improving the metal scratch resistance of the surface of the coiled material.
The light reflecting paint for the outdoor pre-rolled steel plate is prepared by the preparation method.
According to the invention, saturated polyester resin formed by condensation polymerization of polybasic acid and polyhydric alcohol is adopted, and a wetting dispersant with an acid group and solvents with different solubilities are matched, so that the silicon dioxide micro powder, micron-sized titanium white, reflective powder and colored toner can be effectively dispersed, and the reflective performance of a paint film can be effectively improved; the coating has reasonable structural design, and can meet the requirements of processing and forming of pre-coated coil steel, reflecting light at night and resisting stain for a long time.
Compared with the prior art, the invention has the beneficial effects that: the reflective coating prepared by the invention has the night reflective effect while meeting the processing performance of coil steel, thereby attracting the attention of people and avoiding accidents; the coating can be uniformly coated at one time, and the construction is very simple and convenient; the coating film has rigidity and flexibility, and has excellent processing forming and durable stain resistance.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The scheme provides a reflective coating for an outdoor pre-coiled steel plate, which comprises the following raw materials: the following were used:
the polyester resin is saturated polyester resin (Dynapol LH748-02, Germany winning Chuangdegussa) formed by condensation polymerization of polybasic acid and polyhydric alcohol.
The solvent A and the solvent D (Jiangmen modesty chemical industry) are respectively n-butyl acetate with the purity of 99% and n-butanol with the purity of 99%; the solvent B (Jiangmen Kaiheng chemical) is dimethylbenzene with the purity of 99 percent; the solvent C (chemical engineering of Hualun Jiangsu) is propylene glycol methyl ether acetate with the purity of 99.5 percent.
The wetting dispersant is a copolymer solution with an acid group (BYK-110, Germany Bike).
The silica micropowder is hydrophobic gas-phase silica (AEROSIL R792, Wiegungsk Germany) treated by dimethyldichlorosilane.
The micron-sized titanium dioxide is a rutile titanium dioxide inorganic pigment produced by a sulfuric acid method processing technology, and the average particle diameter of the micron-sized titanium dioxide inorganic pigment is 260-300 nm (R-996).
The reflective powder is produced by a glass microsphere powder material, does not contain a soluble barium component, has a high refractive index, and has the mesh number of about 800 meshes (Shenzhen Yumingjie, B-57).
The coloring toner is an azure inorganic toner (Dongguan gold plastic pigment, 94464) with excellent weather resistance and stable performance.
The amino resin is methyl etherified high imino melamine (CYMEL 325) containing isobutanol solvent.
Acid catalyst (NACURE 2107, King, USA); the leveling aid is a fluorocarbon-modified polyacrylate (Efka FL 3770, basf, germany).
Example 2:
1) adding 22 parts of polyester resin into a clean dispersion cylinder, slowly and sequentially adding 2 parts of solvent A, 2 parts of solvent B, 0.4 part of wetting dispersant and 0.35 part of silicon dioxide micropowder at a stirring speed of 450r/min, gradually increasing the rotating speed to 800r/min, and stirring for 10 minutes;
2) then keeping the rotating speed, adding 19 parts of micron-sized titanium dioxide, 6.5 parts of reflective powder and 0.5 part of coloring toner, then increasing the rotating speed to 1400r/min, and stirring for 18 minutes;
3) pouring the slurry stirred in the step 2) into a grinding machine for high-speed grinding, pouring the slurry into a clean dispersion cylinder when the slurry is ground to the fineness of below 30 mu m, flushing the grinding machine by using 5.5 parts of solvent C, and merging the flushing liquid into the clean dispersion cylinder;
4) slowly increasing the rotating speed to 600r/min, slowly and sequentially adding 27 parts of polyester resin, 5.5 parts of amino resin, 0.3 part of acid catalyst, 1 part of solvent D and 0.8 part of leveling aid after stirring for 8 minutes, sampling and testing the viscosity after stirring for 13 minutes, and diluting the mixture to the proper viscosity by using the solvent A if the mixture is too thick.
Example 3:
1) adding 24 parts of polyester resin into a clean dispersion cylinder, slowly and sequentially adding 2.5 parts of solvent A, 2.5 parts of solvent B, 0.5 part of wetting dispersant and 0.5 part of silicon dioxide micropowder at a stirring speed of 550r/min, gradually increasing the rotating speed to 1000r/min, and stirring for 15 minutes;
2) then keeping the rotating speed, adding 20 parts of micron-sized titanium dioxide, 8 parts of reflective powder and 0.6 part of coloring toner, then increasing the rotating speed to 1450r/min, and stirring for 20 minutes;
3) pouring the slurry stirred in the step 2) into a grinding machine for high-speed grinding, pouring the slurry into a clean dispersion cylinder when the slurry is ground to the fineness of below 30 micrometers, flushing the grinding machine by 6 parts of solvent C, and merging the flushing liquid into the clean dispersion cylinder;
4) slowly increasing the rotating speed to 650r/min, slowly and sequentially adding 28 parts of polyester resin, 6 parts of amino resin, 0.4 part of acid catalyst, 1.2 parts of solvent D and 1 part of leveling aid after stirring for 10 minutes, sampling and testing the viscosity after stirring for 15 minutes, and diluting the mixture to a proper viscosity by using the solvent A if the mixture is too thick.
Comparative example 1: the same as in example 1, except that the solvent D was replaced with the same amount of solvent A.
The performance of the reflective coatings prepared in the examples 1-3 and the comparative example 1 is tested by referring to the test methods of GB/T13448-:
TABLE 1
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| bending/T | 2 | 1 | 2 | 3 |
| Reverse impact/kg cm | >90 | >90 | >90 | 82 |
| Pencil hardness (China 505) | H | H | H | H |
| Adhesion (lattice drawing method) | Level 0 | Level 0 | Level 1 | Stage 2 |
| Reflecting effect (visual inspection) | Is obvious | Is obvious | Is obvious | In general |
The reflective coating prepared by the invention has the night reflective effect while meeting the processing performance of coil steel; the construction is very simple; the coating film has rigidity, flexibility and durable stain resistance. The replacement of the solvent can cause the volatilization gradient of the system to be influenced, and further the film forming performance of the coating is influenced.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (10)
1. A preparation method of a reflective coating for outdoor pre-coiled steel plates is characterized by comprising the following steps:
1) adding 20-24 parts of polyester resin into a clean dispersion cylinder, slowly and sequentially adding 1.5-2.5 parts of solvent A, 1.5-2.5 parts of solvent B, 0.3-0.5 part of wetting dispersant and 0.2-0.5 part of silica micropowder at a stirring speed of 350-550 r/min, gradually increasing the rotating speed to 800-1000 r/min, and stirring for 10-15 minutes;
2) then keeping the rotating speed, adding 18-20 parts of micron-sized titanium dioxide, 5-8 parts of reflective powder and 0.3-0.6 part of coloring toner, increasing the rotating speed to 1300-1450 r/min, and stirring for 15-20 minutes;
3) pouring the slurry stirred in the step 2) into a grinding machine for high-speed grinding, pouring the slurry into a clean dispersion cylinder when the slurry is ground to the fineness of below 30 micrometers, flushing the grinding machine by using 5-6 parts of solvent C, and merging the flushing liquid into the clean dispersion cylinder;
4) slowly increasing the rotating speed to 550-650 r/min, slowly and sequentially adding 25-28 parts of polyester resin, 5-6 parts of amino resin, 0.2-0.4 part of acid catalyst, 0.8-1.2 parts of solvent D and 0.5-1 part of leveling assistant after stirring for 5-10 minutes, and adding 1-1.5 parts of solvent A after stirring for 10-15 minutes to dilute to proper viscosity.
2. The method of claim 1, wherein the polyester resin is a saturated polyester resin obtained by polycondensation of a polybasic acid and a polyhydric alcohol.
3. The method of claim 1, wherein the solvent a is butyl acetate; the solvent B is dimethylbenzene; the solvent C is propylene glycol methyl ether acetate; the solvent D is n-butanol.
4. The method of claim 1, wherein the fine silica powder is hydrophobic fumed silica treated with dimethyldichlorosilane.
5. The method of claim 1, wherein the micron-sized titanium dioxide is a rutile titanium dioxide inorganic pigment produced by a sulfuric acid process, and the average particle diameter of the micron-sized titanium dioxide is 260-300 nm.
6. The method as claimed in claim 1, wherein the reflective powder is prepared from glass bead powder, and the mesh size is 700-800 mesh.
7. The method of claim 1, wherein the amino resin is methyl etherified high imino melamine containing isobutanol solvent.
8. The method of claim 1, wherein the leveling agent is a fluorocarbon-modified polyacrylate.
9. The method of claim 1, wherein the wetting and dispersing agent is a copolymer solution with acidic groups.
10. A reflective paint for outdoor pre-rolled steel sheets prepared by the method of any one of claims 1 to 9.
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| CN202111228657.XA CN113789107A (en) | 2021-10-21 | 2021-10-21 | Preparation method of reflective coating for outdoor pre-coiled steel plate |
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| CN202111228657.XA CN113789107A (en) | 2021-10-21 | 2021-10-21 | Preparation method of reflective coating for outdoor pre-coiled steel plate |
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