CN118027712A - High-glossiness water-based aluminum pigment for automobile coating - Google Patents
High-glossiness water-based aluminum pigment for automobile coating Download PDFInfo
- Publication number
- CN118027712A CN118027712A CN202410431174.7A CN202410431174A CN118027712A CN 118027712 A CN118027712 A CN 118027712A CN 202410431174 A CN202410431174 A CN 202410431174A CN 118027712 A CN118027712 A CN 118027712A
- Authority
- CN
- China
- Prior art keywords
- aluminum
- aluminum pigment
- flaky
- flaky aluminum
- hydroxylated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 126
- 239000000049 pigment Substances 0.000 title claims abstract description 69
- 238000000576 coating method Methods 0.000 title claims abstract description 32
- 239000011248 coating agent Substances 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 239000003973 paint Substances 0.000 claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007864 aqueous solution Substances 0.000 claims abstract description 16
- 229910021538 borax Inorganic materials 0.000 claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 16
- 239000001257 hydrogen Substances 0.000 claims abstract description 16
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 16
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920002545 silicone oil Polymers 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000033444 hydroxylation Effects 0.000 claims abstract description 3
- 238000005805 hydroxylation reaction Methods 0.000 claims abstract description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 62
- 238000001035 drying Methods 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 23
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 22
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 21
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 21
- -1 polyoxyethylene Polymers 0.000 claims description 21
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- HPEPIADELDNCED-UHFFFAOYSA-N triethoxysilylmethanol Chemical compound CCO[Si](CO)(OCC)OCC HPEPIADELDNCED-UHFFFAOYSA-N 0.000 claims description 12
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 5
- 229910000077 silane Inorganic materials 0.000 claims description 5
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 claims description 3
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 3
- BHCIEQZOSOEXOJ-UHFFFAOYSA-N [Si].CC(=O)C Chemical compound [Si].CC(=O)C BHCIEQZOSOEXOJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000003513 alkali Substances 0.000 abstract description 6
- 238000000280 densification Methods 0.000 abstract description 4
- 230000010485 coping Effects 0.000 abstract description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 15
- 238000002360 preparation method Methods 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002932 luster Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000003301 hydrolyzing effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012418 validation experiment Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
The invention relates to the technical field of aluminum pigments, in particular to a high-glossiness water-based aluminum pigment for an automobile coating, wherein the flaky aluminum pigment is obtained by carrying out surface hydroxylation treatment on the flaky aluminum pigment to obtain hydroxylated flaky aluminum, and then the hydroxylated flaky aluminum is obtained by wrapping organic silicon; the organic silicon coating adopts the means of coating and densification, the coating adopts hydrogen-containing silicone oil to crosslink and coat, and small molecular siloxane is introduced in the coating process, and the densification adopts alkaline sodium borate aqueous solution, so that the compactness of the coating layer is further improved. The high-glossiness water-based aluminum pigment for the automobile paint has the capability of coping with severe environments such as high temperature, acid, alkali and the like, can ensure that even if the paint is exposed to the outdoor environment for a long time, the paint can keep better performance, and meets the use requirement of the paint in the automobile industry.
Description
Technical Field
The invention relates to the technical field of aluminum pigments, in particular to a high-glossiness water-based aluminum pigment for an automobile coating.
Background
The metallic pigment is a pigment having special luster, mainly composed of powders of some flaky metals, alloys and metal oxides, and thus has very strong metallic luster and glitter visual sense, so that it is often used as a decorative pigment, among which the most widely used metallic pigments are mainly aluminum pigments, zinc powders, copper zinc alloy powders, and the like.
Aluminum pigments are pigments widely used in automotive coatings and have a unique platelet-like structure that imparts metallic luster and reflective effects to the coating. The automotive coating is required to be exposed to the outdoor environment for a long time, and the complexity and the harshness of the outdoor environment can cause the aluminum pigment to be easily corroded, thereby causing defects such as reduced glossiness, oxidized and the like.
In the prior art, the capability of aluminum pigment in the coating to cope with severe environments such as high temperature, acid, alkali and the like is generally improved by wrapping, so that the durability of the aluminum pigment is improved, and the organosilicon coating modification is widely applied due to simpler operation and environmental friendliness. For example, chinese patent No. 109694592B discloses a preparation method of organosilicon-coated water-based aluminum pigment and an aluminum pigment, and the invention adopts organosilicon with reactivity to graft and condense and crosslink on the surface of aluminum powder, thus realizing the microencapsulation of the aluminum powder. However, when the method of this patent is applied to an automotive coating, it is necessary to increase the thickness of the silicone, which leads to a decrease in the glossiness of the aluminum pigment, due to the long-term exposure of the automotive coating to the outdoor environment.
Disclosure of Invention
In view of the above, the present invention is directed to providing a high-gloss aqueous aluminum pigment for automotive coatings, which provides an aqueous aluminum pigment with high gloss and long durability, and is suitable for complex and severe application environments of automotive coatings.
Based on the above purpose, the invention provides a high-glossiness water-based aluminum pigment for automobile paint, which is obtained by carrying out surface hydroxylation treatment on flaky aluminum pigment to obtain hydroxylated flaky aluminum, and then coating the hydroxylated flaky aluminum with organic silicon; the specific steps of the organic silicon package are as follows:
S1: dispersing hydroxylated flaky aluminum and chloroplatinic acid in acetone, then adding an organosilicon acetone solution, heating to 90-100 ℃, stirring and reacting for 90-120min, then washing and drying to obtain organosilicon coated flaky aluminum;
S2: dispersing organosilicon coated flaky aluminum in sodium borate aqueous solution, then adding 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 50-60 ℃, stirring for reaction for 30-50min, cooling to room temperature, standing for 12-16h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
Preferably, the organosilicon acetone solution in the step S1 is obtained by mixing hydrogen-containing silicone oil, hydroxymethyl triethoxysilane, a silane crosslinking agent and acetone according to a weight ratio of 8-16:2-5:1-3:50-100.
Preferably, the molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane in the step S2 is as follows:
wherein n is 6-9.
Preferably, the preparation steps of the hydroxylated flaky aluminum are as follows: dispersing flaky aluminum in absolute ethanol, adding triethanolamine, heating to 50-60 ℃, stirring for reaction for 30-40min, washing and drying to obtain hydroxylated flaky aluminum.
Preferably, the sheet diameter of the sheet aluminum is 10-15 μm.
Preferably, the weight ratio of the flaky aluminum powder to the anhydrous ethanol to the triethanolamine is 10-20:50-100:0.3-0.8.
Preferably, the weight ratio of the hydroxylated flaky aluminum, chloroplatinic acid, acetone and the organic silicon acetone solution in the step S1 is 10-20:0.05-0.2:50-100:50-100.
Preferably, in the step S2, the weight ratio of the organosilicon coated flaky aluminum to the anhydrous ethanol to the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane is 10-20:50-100:1-3.
Preferably, the pH of the aqueous solution of sodium borate in the step S2 is 8.5-8.8, and the concentration is 0.8-1.2mol/L.
Preferably, the silane cross-linking agent is one of tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane and methyltriethoxysilane.
The invention has the beneficial effects that:
The high-glossiness aqueous aluminum pigment for the automobile paint provided by the invention has the capability of coping with severe environments such as high temperature, acid, alkali and the like, can ensure that even if the high-glossiness aqueous aluminum pigment is exposed to outdoor environments for a long time, can keep better performance, meets the use requirements of the paint in the automobile industry, and has high glossiness in the aqueous paint compared with the traditional organosilicon-coated aluminum pigment.
The high-glossiness water-based aluminum pigment for the automobile coating provided by the invention adopts the wrapping and densification means to improve the capability of the flaky aluminum surface to cope with severe environments such as high temperature, acid, alkali and the like, has small influence on the glossiness, adopts hydrogen-containing silicone oil for crosslinking wrapping, introduces micromolecular siloxane in the wrapping process, and adopts alkaline sodium borate aqueous solution for densification, so that the compactness of a wrapping layer is further improved, and further the aluminum pigment has excellent corrosion resistance.
The high-glossiness water-based aluminum pigment for the automobile paint adopts 2- [ methoxy (polyoxyethylene) propyl ] trimethoxy silane with a longer molecular chain, and the long ether chain ensures that the water-based aluminum pigment has high water solubility and high water-based resin compatibility, and is mainly distributed on the outer surface of the aluminum pigment due to the influence of steric hindrance and hydrolysis speed, and cannot enter into small gaps of organic silicon to influence the compactness of a wrapping film.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
The sheet diameters of the sheet aluminum in the examples and comparative examples of the present invention were 12.6. Mu.m, the hydrogen content of the hydrogen-containing silicone oil was 1.8% by weight, and the viscosity (25 ℃) was 26 to 28mm 2/s.
Example 1: preparation of high-glossiness aqueous aluminum pigment for automobile coating:
(1) Dispersing 10g of flaky aluminum in 50g of absolute ethyl alcohol, then adding 0.3g of triethanolamine, heating to 55 ℃, stirring and reacting for 30min, washing and drying to obtain hydroxylated flaky aluminum;
(2) 8g of hydrogen-containing silicone oil, 2g of hydroxymethyl triethoxysilane and 1g of tetraethoxysilane are dispersed in 50g of acetone to obtain an organosilicon dispersion liquid;
(3) Dispersing 10g of hydroxylated flaky aluminum and 0.05g of chloroplatinic acid in 50g of acetone, then adding 50g of organosilicon acetone solution, heating to 90 ℃, stirring for reaction for 90min, then washing and drying to obtain organosilicon coated flaky aluminum;
(4) Dispersing 10g of organosilicon coated flaky aluminum in 50g of sodium borate aqueous solution with the concentration of 1mol/L and the pH of 8.7, then adding 1g of 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 50 ℃, stirring and reacting for 40min, cooling to room temperature, standing for 14h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
The molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane is as follows:
，n＝6。
example 2: preparation of high-glossiness aqueous aluminum pigment for automobile coating:
(1) Dispersing 15g of flaky aluminum in 80g of absolute ethyl alcohol, then adding 0.5g of triethanolamine, heating to 55 ℃, stirring and reacting for 40min, washing and drying to obtain hydroxylated flaky aluminum;
(2) 10g of hydrogen-containing silicone oil, 3g of hydroxymethyl triethoxysilane and 2g of tetraethoxysilane are dispersed in 70g of acetone to obtain an organosilicon dispersion liquid;
(3) 15g of hydroxylated flaky aluminum and 0.1g of chloroplatinic acid are dispersed in 80g of acetone, then 80g of organosilicon acetone solution is added, the temperature is raised to 100 ℃, the reaction is stirred for 100min, and then the mixture is washed and dried to obtain organosilicon coated flaky aluminum;
(4) Dispersing 15g of organosilicon coated flaky aluminum in 50-100g of sodium borate aqueous solution with the concentration of 1mol/L and the pH of 8.7, then adding 2g of 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 60 ℃, stirring and reacting for 40min, cooling to room temperature, standing for 14h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
The molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane is as follows:
，n＝7。
example 3: preparation of high-glossiness aqueous aluminum pigment for automobile coating:
(1) Dispersing 20g of flaky aluminum in 100g of absolute ethyl alcohol, then adding 0.8g of triethanolamine, heating to 60 ℃, stirring and reacting for 40min, washing and drying to obtain hydroxylated flaky aluminum;
(2) 16g of hydrogen-containing silicone oil, 5g of hydroxymethyl triethoxysilane and 3g of tetraethoxysilane are dispersed in 100g of acetone to obtain an organosilicon dispersion liquid;
(3) Dispersing 20g of hydroxylated flaky aluminum and 0.2g of chloroplatinic acid in 100g of acetone, then adding 100g of organosilicon acetone solution, heating to 100 ℃, stirring for reaction for 120min, then washing and drying to obtain organosilicon coated flaky aluminum;
(4) Dispersing 20g of organosilicon coated flaky aluminum in 100g of sodium borate aqueous solution with the concentration of 1mol/L and the pH of 8.7, then adding 3g of 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 60 ℃, stirring and reacting for 50min, cooling to room temperature, standing for 16h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
The molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane is as follows:
，n＝9。
example 4: preparation of high-glossiness aqueous aluminum pigment for automobile coating:
(1) Dispersing 18g of flaky aluminum in 60g of absolute ethyl alcohol, then adding 0.7g of triethanolamine, heating to 55 ℃, stirring and reacting for 35min, washing and drying to obtain hydroxylated flaky aluminum;
(2) 12g of hydrogen-containing silicone oil, 4g of hydroxymethyl triethoxysilane and 2g of tetramethoxysilane are dispersed in 70g of acetone to obtain an organosilicon dispersion liquid;
(3) Dispersing 18g of hydroxylated flaky aluminum and 0.15g of chloroplatinic acid in 70g of acetone, then adding 70g of organosilicon acetone solution, heating to 100 ℃, stirring for reaction for 90min, then washing and drying to obtain organosilicon coated flaky aluminum;
(4) Dispersing 18g of organosilicon coated flaky aluminum in 80g of sodium borate aqueous solution with the concentration of 1mol/L and the pH of 8.7, then adding 2.5g of 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 55 ℃, stirring and reacting for 40min, cooling to room temperature, standing for 16h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
The molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane is as follows:
，n＝8。
example 5: preparation of high-glossiness aqueous aluminum pigment for automobile coating:
(1) Dispersing 15g of flaky aluminum in 75g of absolute ethyl alcohol, then adding 0.5g of triethanolamine, heating to 55 ℃, stirring and reacting for 35min, washing and drying to obtain hydroxylated flaky aluminum;
(2) 12g of hydrogen-containing silicone oil, 3.5g of hydroxymethyl triethoxysilane and 3g of methyltrimethoxysilane are dispersed in 75g of acetone to obtain an organosilicon dispersion liquid;
(3) 15g of hydroxylated flaky aluminum and 0.1g of chloroplatinic acid are dispersed in 75g of acetone, then 75g of organosilicon acetone solution is added, the temperature is raised to 90 ℃, the reaction is stirred for 120min, and then the mixture is washed and dried to obtain organosilicon coated flaky aluminum;
(4) Dispersing 15g of organosilicon coated flaky aluminum in 75g of sodium borate aqueous solution with the concentration of 1mol/L and the pH of 8.7, then adding 2g of 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 60 ℃, stirring and reacting for 30min, cooling to room temperature, standing for 14h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
The molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane is as follows:
，n＝7。
Example 6: preparation of high-glossiness aqueous aluminum pigment for automobile coating:
(1) Dispersing 16g of flaky aluminum in 80g of absolute ethyl alcohol, then adding 0.6g of triethanolamine, heating to 55 ℃, stirring and reacting for 35min, washing and drying to obtain hydroxylated flaky aluminum;
(2) 14g of hydrogen-containing silicone oil, 4g of hydroxymethyl triethoxysilane and 2.5g of methyltriethoxysilane are dispersed in 80g of acetone to obtain an organosilicon dispersion;
(3) Dispersing 18g of hydroxylated flaky aluminum and 0.15g of chloroplatinic acid in 80g of acetone, then adding 80g of organosilicon acetone solution, heating to 100 ℃, stirring and reacting for 90min, then washing and drying to obtain organosilicon coated flaky aluminum;
(4) Dispersing 18g of organosilicon coated flaky aluminum in 80g of sodium borate aqueous solution with the concentration of 1mol/L and the pH of 8.7, then adding 12.5g of 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 60 ℃, stirring and reacting for 40min, cooling to room temperature, standing for 14h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
The molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane is as follows:
，n＝7。
Comparative example 1:
Comparative example 1 differs from example 2 in that: the hydroxymethyl triethoxysilane in the embodiment (2) is replaced by hydrogen-containing silicone oil, and the rest steps are the same as those in the embodiment (2), and are not repeated.
Comparative example 2:
comparative example 2 differs from example 2 in that: the tetraethoxysilane in the embodiment (2) is replaced by hydrogen-containing silicone oil, and the rest steps are the same as the embodiment (2), and are not repeated.
Comparative example 3:
Comparative example 3 differs from example 2 in that: the aqueous solution of sodium borate with the concentration of 1mol/L and the pH of 8.7 in the embodiment (2) is replaced by the aqueous solution with the pH of 8.6 adjusted by ammonia water, and the rest steps are the same as the embodiment (2), and the description is omitted again.
Comparative example 4:
comparative example 4 differs from example 2 in that: the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane of example (2) was replaced with trimethyl [3- (2-methoxy) propyl ] silane.
Comparative example 5:
(1) Dispersing 15g of flaky aluminum in 80g of absolute ethyl alcohol, then adding 0.5g of triethanolamine, heating to 55 ℃, stirring and reacting for 40min, washing and drying to obtain hydroxylated flaky aluminum;
(2) 15g of hydrogen-containing silicone oil was dispersed in 70g of acetone to obtain a silicone dispersion;
(3) 15g of hydroxylated flaky aluminum and 0.1g of chloroplatinic acid are dispersed in 80g of acetone, then 80g of organosilicon acetone solution is added, the temperature is raised to 100 ℃, the reaction is stirred for 100min, and then the mixture is washed and dried, thus obtaining the organosilicon coated flaky aluminum.
To demonstrate the performance effects of the aluminum pigments prepared in the examples and comparative examples, the following validation experiments were provided:
Corrosion resistance test: the corrosion resistance test is carried out according to the requirement of aqueous aluminum powder slurry HG/T2456.5-2016, and certain adjustment is carried out, and the specific steps are as follows: 1g of the aluminum pigments of examples, comparative examples and comparative examples were added to tap water, 1mol/L hydrochloric acid aqueous solution and 1mol/L sodium hydroxide solution, respectively, and heated at 100℃for 12 hours to test the hydrogen production amount, thereby judging the corrosion resistance of the aluminum pigments, and the test results are shown in Table 1.
Gloss test: the aluminum pigments of the examples, the comparative examples and the commercial aqueous polyurethane were mixed according to a weight ratio of 1:10, uniformly stirred and sprayed onto a carbon steel plate with a size, then dried at room temperature for 24 hours, and the glossiness was measured by a glossiness meter at an angle of 60 degrees, and the test results are shown in table 1.
TABLE 1 results of Performance verification experiments
Data analysis:
From examples 1 to 6, it can be seen that the high-glossiness aqueous aluminum pigment for automobile paint prepared by the invention has the capability of coping with severe environments such as high temperature, acid, alkali and the like, can ensure that even if the paint is exposed to outdoor environment for a long time, the high-glossiness aqueous aluminum pigment for automobile paint prepared by the invention can maintain good performance, meets the use requirement of the paint in the automobile industry, and has high glossiness in the aqueous paint compared with the traditional organosilicon-coated aluminum pigment.
From example 2 and comparative examples 1 to 5, it can be seen that the aqueous solutions of hydroxymethyl triethoxysilane, tetraethoxysilane and sodium borate together improve the corrosion resistance of the high-glossiness aqueous aluminum pigment for automobile paint, so that the aqueous aluminum pigment can effectively cope with severe environments such as high temperature, acid, alkali and the like, mainly because of the hydrolytic crosslinking of hydroxymethyl triethoxysilane and tetraethoxysilane in sodium borate alkaline solution and the bonding effect between borate and hydrolytic silicon hydroxyl, small-molecule hydroxymethyl triethoxysilane, tetraethoxysilane and sodium borate can fully permeate into an organosilicon network to form secondary crosslinking, so that the crosslinking density is improved, the tiny gaps in the organosilicon coating are compensated, the protection capability of flaky aluminum is further improved, the low-thickness package maintains the glossiness of aluminum, and meanwhile, the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane can improve the dispersibility and compatibility of the aluminum pigment in the aqueous paint, so that the aqueous aluminum pigment has higher glossiness.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (8)
1. A high-glossiness water-based aluminum pigment for an automobile coating is characterized in that the water-based aluminum pigment is obtained by carrying out surface hydroxylation treatment on a flaky aluminum pigment to obtain hydroxylated flaky aluminum, and then coating the hydroxylated flaky aluminum with organic silicon;
The specific steps of the organic silicon package are as follows:
S1: dispersing hydroxylated flaky aluminum and chloroplatinic acid in acetone, then adding an organosilicon acetone solution, heating to 90-100 ℃, stirring and reacting for 90-120min, then washing and drying to obtain organosilicon coated flaky aluminum;
S2: dispersing organosilicon coated flaky aluminum in sodium borate aqueous solution, then adding 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane, heating to 50-60 ℃, stirring for reaction for 30-50min, cooling to room temperature, standing for 12-16h, and drying to obtain the high-glossiness aqueous aluminum pigment for the automobile paint;
the organic silicon acetone solution in the step S1 is obtained by mixing hydrogen-containing silicone oil, hydroxymethyl triethoxysilane, a silane cross-linking agent and acetone according to the weight ratio of 8-16:2-5:1-3:50-100;
The molecular formula of the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane in the step S2 is as follows:
wherein n is 6-9.
2. The high-gloss aqueous aluminum pigment for automotive coatings according to claim 1, characterized in that the hydroxylated flaky aluminum is prepared by the steps of: dispersing flaky aluminum in absolute ethanol, adding triethanolamine, heating to 50-60 ℃, stirring for reaction for 30-40min, washing and drying to obtain hydroxylated flaky aluminum.
3. The high-gloss aqueous aluminum pigment for automobile paint according to claim 2, wherein the flake aluminum has a flake diameter of 10 to 15 μm.
4. The high-gloss aqueous aluminum pigment for automobile coating according to claim 2, wherein the weight ratio of the flaky aluminum powder, the anhydrous ethanol and the triethanolamine is 10-20:50-100:0.3-0.8.
5. The high-gloss aqueous aluminum pigment for automotive coatings according to claim 1, wherein the weight ratio of hydroxylated flaky aluminum, chloroplatinic acid, acetone and organosilicon acetone solution in step S1 is 10-20:0.05-0.2:50-100:50-100.
6. The high-gloss aqueous aluminum pigment for automobile paint according to claim 1, wherein the weight ratio of the silicone-coated flaky aluminum, the absolute ethanol and the 2- [ methoxy (polyoxyethylene) propyl ] trimethoxysilane in step S2 is 10-20:50-100:1-3.
7. The high-gloss aqueous aluminum pigment for automobile paint according to claim 1, wherein the aqueous solution of sodium borate in step S2 has a pH of 8.5 to 8.8 and a concentration of 0.8 to 1.2mol/L.
8. The high-gloss aqueous aluminum pigment for automotive coatings according to claim 1, wherein the silane crosslinking agent is one of tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane and methyltriethoxysilane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410431174.7A CN118027712A (en) | 2024-04-11 | 2024-04-11 | High-glossiness water-based aluminum pigment for automobile coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410431174.7A CN118027712A (en) | 2024-04-11 | 2024-04-11 | High-glossiness water-based aluminum pigment for automobile coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118027712A true CN118027712A (en) | 2024-05-14 |
Family
ID=90989630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410431174.7A Pending CN118027712A (en) | 2024-04-11 | 2024-04-11 | High-glossiness water-based aluminum pigment for automobile coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118027712A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633798A (en) * | 2009-08-17 | 2010-01-27 | 昆明理工大学 | Preparation method of aluminum paste for water paint |
| CN102516831A (en) * | 2011-11-25 | 2012-06-27 | 中山大学 | Preparation method for organic/inorganic hybridization cladding aluminum composite particle |
| JP2013064053A (en) * | 2011-09-16 | 2013-04-11 | Seiko Epson Corp | Water-resistant aluminum pigment dispersion, method of producing the pigment dispersion, and aqueous ink composition |
| CN109694592A (en) * | 2017-10-23 | 2019-04-30 | 北京化工大学 | A kind of preparation method and based aluminum pigment of the based aluminum pigment of silicone covering |
| CN113755038A (en) * | 2021-09-22 | 2021-12-07 | 山东银箭金属颜料有限公司 | Water-based aluminum pigment with enhanced anti-corrosion performance |
-
2024
- 2024-04-11 CN CN202410431174.7A patent/CN118027712A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633798A (en) * | 2009-08-17 | 2010-01-27 | 昆明理工大学 | Preparation method of aluminum paste for water paint |
| JP2013064053A (en) * | 2011-09-16 | 2013-04-11 | Seiko Epson Corp | Water-resistant aluminum pigment dispersion, method of producing the pigment dispersion, and aqueous ink composition |
| CN102516831A (en) * | 2011-11-25 | 2012-06-27 | 中山大学 | Preparation method for organic/inorganic hybridization cladding aluminum composite particle |
| CN109694592A (en) * | 2017-10-23 | 2019-04-30 | 北京化工大学 | A kind of preparation method and based aluminum pigment of the based aluminum pigment of silicone covering |
| CN113755038A (en) * | 2021-09-22 | 2021-12-07 | 山东银箭金属颜料有限公司 | Water-based aluminum pigment with enhanced anti-corrosion performance |
Non-Patent Citations (1)
| Title |
|---|
| 余龙飞;郑小珊;李欢玲;李莉;: "聚醚改性聚硅氧烷的合成及其在水性涂料消泡剂中的应用", 有机硅材料, no. 05, 25 September 2013 (2013-09-25), pages 5 - 10 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4358897B1 (en) | Method for producing surface-coated aluminum pigment | |
| EP3006526B1 (en) | Hot-dip aluminum-zinc coated steel sheet with excellent weatherability, corrosion resistance, and alkali resistance, and preparation method and surface treatment agent therefor | |
| CN109536937B (en) | High-corrosion-resistance galvanized steel sheet and preparation method thereof | |
| CN109694592B (en) | Preparation method of organic silicon coated water-based aluminum pigment and water-based aluminum pigment | |
| CN111349923A (en) | Chromium-free environment-friendly passivation treating fluid for zinc layer surface and preparation method and application thereof | |
| CN108570249B (en) | A kind of preparation method and aluminium pigment of high gloss based aluminum pigment | |
| CN113150387A (en) | Preparation method of hydrophobic silicon micro powder | |
| CN106459666A (en) | Binding composition, method for manufacturing a sacrificial coating for protection against corrosion using said composition and substrate coated with such a coating | |
| CN115011202A (en) | Water-based epoxy resin coating based on modified graphite and preparation method thereof | |
| CN118027712A (en) | High-glossiness water-based aluminum pigment for automobile coating | |
| CN107974139B (en) | Preparation method of high chlorinated polyethylene-epoxy resin anticorrosive paint containing dry coupling modified mica powder | |
| CN114479660A (en) | Chromium-free zinc-aluminum-nickel coating composite product and application thereof | |
| CN112322168A (en) | Water-based aluminum powder paint and preparation method thereof | |
| CN112126880A (en) | High-corrosion-resistance hot-dip galvanized steel plate and preparation method thereof | |
| CN111019465B (en) | Preparation process of organic-inorganic composite water-based acrylic acid anticorrosive paint | |
| JP2005238001A (en) | Metal product applied with rustpreventive coating | |
| CN113527964A (en) | Water-based acrylic acid protective coating | |
| CN116284689A (en) | Composite curing agent, preparation method and application thereof in production of electric insulation powder coating | |
| CN112961350B (en) | High-temperature-resistant resin, preparation method and application thereof, high-temperature-resistant coating containing high-temperature-resistant resin, preparation method and coating | |
| CN103360800A (en) | High-floatage type water-based aluminium-silver paste and preparation method thereof | |
| CN115232492A (en) | Water-based phosphate ceramic coating and preparation method thereof | |
| CN111363468B (en) | Paint spraying process for surface of automobile support | |
| CN113025081B (en) | Coated aluminum powder and preparation method thereof, and silver-white aluminum paint and preparation method thereof | |
| CN113025201A (en) | High-temperature-resistant inorganic hybrid silicone resin metal anticorrosive paint and preparation method and application thereof | |
| CN113512723A (en) | Method for improving corrosion resistance of phosphorus-free pretreatment agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |