CN100556969C - A kind of metal topcoat with different color effect and preparation method thereof - Google Patents

Abstract

The invention relates to a metal topcoat with an angle-dependent color effect and a preparation method thereof. The present invention adopts stable and transparent nano-particle dispersion slurry with color-dependent effect, and polyester resin, amino resin, blocked isocyanate modified resin, metal aluminum powder, other pigments and fillers, solvents, and additives In combination, a certain preparation process is used to prepare a metal topcoat with a color-dependent effect. By adopting the method provided by the invention, the nanoparticles are evenly dispersed in the paint, and the prepared metal topcoat has high gloss and low haze value, and has obvious color flop effect and good decoration, scratch resistance and stone chip resistance Resistance, abrasion resistance and aging resistance. Used in car topcoat, metal exterior decoration paint, etc.

Description

A kind of metal topcoat with different color effect and preparation method thereof

technical field

The invention belongs to the field of chemical industry, and relates to a metal topcoat with an angle-dependent color effect and a preparation method thereof.

Background of the invention

The high-grade and high-performance requirements of automobiles force the development of automobile coatings to continuously improve their protection and decoration performance. The main focus is to improve the decoration of the car surface, improve the scratch resistance and anti-corrosion ability, and better protect the environment, especially the surface protection and decoration layer of the car body, which directly affects the appearance and appreciation of the whole car.

The research and development and industrialization of nano-materials for modified automotive coatings started earlier in the United States and Germany, and the research and development of nano-modified automotive coatings started relatively late in China. CN1189522A, a patent for nano-metal automotive topcoats, was applied by Chu Yanming , it is made of acrylic resin, amino resin, polyester resin, cellulose resin as the base material, adding various pigments, metal nano-powders, fillers, additives, solvents through mechanical processing, the coating has a strong adhesion Focus on acid resistance, alkali resistance and chemical resistance; CN1253978A applied by people such as Wu Limin is a high scratch resistance car paint, which realizes high scratch resistance by improving the base material polyester resin of the paint. At present, there is no metal flash automotive topcoat technology and related patent reports modified by inorganic nanoparticles.

Nano TiO ₂ (10-50nm) has a strong transmittance to visible light, for example, to 550nm visible light, the transparency can reach more than 90%, and it has excellent ultraviolet light shielding property. When nano-sized TiO ₂ is mixed with aluminum powder pigment or mica pearlescent pigment for coating, it can get the coating with angle-dependent color effect. This is mainly due to the fact that nano-TiO ₂ itself has both transparency and a certain degree of hiding power for visible light. When it is mixed with aluminum powder pigments, a part of the incident light is specularly reflected on the surface of the astigmatic aluminum powder, while the other part passes through the nano-particles. After the dispersion of TiO ₂ occurs, it reflects at the interface between nano-TiO ₂ and aluminum powder to form a light-scattering coating, so it has a unique color-dependent effect. Adding different colors of pearlescent pigments can form different front-view colors and side-view colors. The use of nano- _TiO2 in metallic flash automotive topcoats can prepare metallic topcoats with angle-dependent color effects, which can be used for car topcoats, metal exterior decorative paints, etc.

Contents of the invention

The object of the present invention is to provide a metal topcoat with color-flop effect and a preparation method thereof.

The present invention proposes a metallic topcoat with color-dependent effect and a preparation method thereof, which uses special dispersion means to prepare nano-particle dispersion slurry with color-dependent effect, and is mixed with polyester resin, amino resin, modified resin, Aluminum powder, directional agent, solvent, pigments and fillers, and additives are combined to prepare a metal topcoat with a color-dependent effect. The dosage of each component is as follows:

Composition % by weight % by weight

Nano TiO ₂ particle dispersion slurry 0.5-10

Polyester resin 20-40

Amino resin 3-20

Modified resin 0-10

Aluminum powder 1-10

Orienting agent 1-10

Solvent 30-60

Pigment and filler 0-10

Auxiliary 0.1-3

Specifically, the metal topcoat with the effect of color-dependent effect is composed of nano-particle dispersion slurry, polyester resin, amino resin, modified resin, aluminum powder, orientation agent, solvent, pigment and filler, and auxiliary agent, wherein, (1) Contains inorganic nanoparticle slurry made of nano-titanium dioxide powder and other inorganic nanoparticles after grinding and dispersing, the dosage is 0.5-10wt% of the coating dosage; (2) at least one kind of polyester resin is contained, the dosage is 20-40wt% of the coating dosage (3) resin containing at least one amino resin, the dosage is 3-20wt% of the coating dosage; (4) containing blocked isocyanate modified resin, the dosage is 0-10wt% of the coating dosage; (5) containing at least one A flaky non-floating aluminum powder, the amount of which is 1-10wt% of the amount of paint; (6) at least one aluminum powder orientation agent, the amount of which is 1-10wt% of the amount of paint; (7) containing esters, alcohol ethers (8) Containing conventional pigments and fillers for coatings such as pearlescent pigments, the dosage is 0-10wt% of the coating amount;

(9) Containing additives such as dispersant, wetting agent, leveling agent, anti-blast agent and anti-sedimentation agent for automotive coatings, the dosage is 0.1-3wt%.

The present invention proposes a metallic topcoat with a color-dependent effect and a preparation method thereof. The preparation method of nano- _TiO2 particle dispersion slurry is shown in Chinese application patent 200410053451.8, which mainly consists of dispersion resin, rutile nano _-TiO2 powder, and 0- Composed of 2 kinds of inorganic nanoparticles, dispersant and solvent, each component is added through wetting, dispersion, stirring, ultrasonication, grinding and other processes to prepare stable and transparent nanoparticle dispersion slurry, and the particle size of all inorganic nanoparticle dispersion slurry 10-300nm, among which the particle size of 10-150nm is better.

The present invention proposes a kind of metal topcoat with angle-dependent effect and a preparation method thereof, which adopts a nano particle dispersion slurry with a particle diameter of 10-300nm, and the nanoparticles used in the inorganic nano particle dispersion slurry are rutile nano- _TiO2 powder and Another mixture of 0-2 kinds of inorganic nanoparticles, such as rutile nano-TiO ₂ , nano-Al ₂ O ₃ , nano-SiO ₂ , nano-BaSO ₄ , etc.

The invention proposes a metallic topcoat with angle-dependent color effect and its preparation method. The rutile nano-TiO ₂ powder used in the nano-particle dispersion slurry has a particle size of 10-150nm, and the surface has been coated, including Al ₂ O ₃ , SiO ₂ etc. Inorganic coating, organic treatment such as polyalcohol and lauric acid.

The present invention proposes a kind of metal topcoat with color-dependent effect and a preparation method thereof, which uses saturated polyester resin for automotive coatings as the polyester resin, the hydroxyl content of the resin is 2-7wt%, and the acid value is less than 5mgKOH/g. One or more of them are used in combination.

The present invention proposes a metal topcoat with color-dependent effect and a preparation method thereof, which can use butylated melamine resin for automobile coatings as amino resin, and the acid value of the resin is less than 1mgKOH/g, and one or more of them can be selected A mixed use.

The present invention proposes a kind of metal topcoat with angle-dependent effect and preparation method thereof, is to adopt a kind of improved abrasion resistance, the blocking isocyanate used for automobile paint of anti-stone impact performance is modified resin, and the NCO content of resin is 2 -10wt%, such as BI7982 of Baxenden Company, Vestanat BI358A of Dedussa Company, DesmpdeurBL3175SN of Bayer Company, choose any one of them.

The present invention proposes a kind of metal topcoat with the effect of different color with angle and its preparation method, is to adopt flake non-floating aluminum powder, such as German Eika Metallux2154, Metallux2156, Metallux8754, SSP504-AR of U.S. Siberline, Toyo Co., Ltd. 7620NS , 7640, NS5680NS, etc. (all silver dollar type, average sheet diameter 15-25um), etc., choose any one of them.

The present invention proposes a kind of metal topcoat with different color effect and preparation method thereof. The aluminum powder directional agent adopted is the directional agent, such as the aluminum powder directional agent CAB381-0.5, CAB551-0.2 etc. of EASTMAN, select wherein 1- 3 types.

The above-mentioned aluminum powder orientation agent is preferably cellulose acetate butyrate compound.

The present invention proposes a metal topcoat with a color-dependent effect and a preparation method thereof. The solvents used are esters, alcohol ethers or high-boiling point solvents, such as butyl acetate, ethyl acetate, ethylene glycol methyl ether, ethyl acetate, etc. Glycol butyl ether, propylene glycol methyl ether, propylene glycol butyl ether, propylene glycol methyl ether acetate, isophorone, RPDE, etc., use two or more of them in combination.

The invention proposes a metal topcoat with color-dependent effect and a preparation method thereof, which can use pearlescent pigments or other pigments and fillers for automotive coatings.

The invention proposes a metal topcoat with a color-dependent effect and a preparation method thereof. The additives used are dispersants, wetting agents, leveling agents, anti-blasting agents, anti-sedimentation agents and the like for automotive coatings.

The present invention proposes a metal topcoat with color-dependent effect and a preparation method thereof. In a dispersion kettle, polyester resin, amino resin, and modified resin are accurately weighed according to the proportion, and part of the solvent is added to stir evenly; After the solvent dissolves the calculated amount of dispersant, wetting agent, leveling agent, anti-blast agent and other additives, add it to the resin liquid; then add the inorganic nanoparticle dispersion slurry, clean the container wall with the remaining solvent, and pour it into the resin liquid , Stir at a low speed of 1000-2000rpm for 10-20 minutes, and use a gear agitator to stir at a high speed of 3000-5000rpm for 1-3 hours. Then add the prepared aluminum powder slurry and pigment slurry, stir with a disc stirrer at 100-500rpm, add anti-settling agent, and fully stir for 1-2 hours, that is, the metal topcoat with color-dependent effect is prepared.

In the present invention, the prepared metal topcoat with color-dependent effect is applied to the surface of the material by brush coating, dip coating, flow coating, or spray coating.

The metal finish paint prepared by the invention is applied to car finish paint and metal exterior decoration paint.

The invention proposes a metallic topcoat with an angle-dependent color effect and a preparation method thereof. The self-made nano particle dispersion slurry has excellent transparency, ultraviolet shielding properties and storage stability. It is stored at room temperature for one year without delamination and particle size does not change. , applied in the coating does not affect the original color or transparency, can improve the weather resistance of the coating.

The present invention proposes a metal topcoat with a color-dependent effect and a preparation method thereof. During construction of the prepared coating, the viscosity is first tested with a Ford-4 ^# cup and controlled to about 20s.

The present invention proposes a metal topcoat with color-dependent effect and a preparation method thereof. The metal topcoat with color-dependent effect is applied by a general coating method, such as brush coating, dip coating, shower coating, and spray coating. method, preferably by spraying. After adjusting the viscosity of the paint, control the temperature and humidity for spraying, as shown in Figure 1.

The sprayed paint is dried at room temperature for 5-10 minutes, then the varnish is sprayed, and finally the varnish is sprayed with a wet-on-wet process, and dried for 5-10 minutes. Bake at -150°C for about 20 minutes, then cool down to room temperature naturally to obtain a finished metallic topcoat with color-following effect.

The present invention proposes a metal topcoat with a color-dependent effect and a preparation method thereof, and the main properties of the obtained coating are as follows:

The metal topcoat with color-dependent effect prepared by the method proposed by the present invention adopts self-grinding nano-particle dispersion slurry, which has good stability, can not be separated by 5000rpm high-speed centrifugation for 5 hours, and can be stored at room temperature for one year without delamination. , without any thickening or sedimentation, and without any change in particle size, which greatly guarantees the dispersion performance of nanomaterials in coatings; in addition, the nanoparticle dispersion slurry prepared by the present invention has good transparency in the visible light region and absorbs in the ultraviolet light region. Superior ability, applied in coatings does not affect the original color or transparency, and enhances the anti-ultraviolet ability and improves the weather resistance of the coating.

Gloss and haze of metal finish paint with different color effect with angle: adopt German BYK-Gardner company S-4601 type fog shadow gloss meter to measure haze value and measure by international standard ISO-DIS13803, the metal finish paint gloss prepared by the present invention ( Gloss) > 95 (measured at 20°), haze (Haze) < 200 (Hlog), can reach about 100.

The anti-stone impact performance of the metallic topcoat with the effect of different colors with the angle is tested according to ASTM D3170-87 (1996). The anti-stone chip performance of the metal finish paint prepared by the invention reaches level 2.

Other performance testing items of metal topcoat with color-dependent effect shall be carried out according to GB/T13492-92, pencil hardness: GB6739; scratch test: GB9286; bending test: GB6742; gloss (60°): GB9754; cupping test mm : GB9753; artificial accelerated aging (1500h): GB1865, all passed.

The invention proposes a metal topcoat with color-dependent effect and a preparation method thereof. The prepared metal topcoat has obvious color-dependent effect and good decoration, scratch resistance, stone chip resistance and wear resistance. High durability and anti-aging properties, high gloss, low haze value, used in car topcoats, metal exterior decorative paints, etc.

Description of drawings

Fig. 1 is the flow chart of spraying metal topcoat of the present invention.

Detailed ways

Example 1:

Formula 1 for metallic finishes with flop effects

Ingredient parts by weight wt(%)

Nano particle dispersion slurry 4.8

Setal173 (polyester resin) 21

Setamine138 (amino resin) 5.5

BI7982 (modified resin) 3.7

Metallux2154 aluminum powder) 3.5

CAB381-0.5 (aluminum powder directional agent) 4.7

Solvents 56

Auxiliary 0.8

The above formula is prepared according to the preparation method proposed by the invention, and a metal topcoat with a color-dependent effect can be obtained. The color-dependent effect of the coating (visual inspection): good, stone chip resistance: ≤2 grades, gloss (Gloss 20°) 97, Haze Hlog 95, artificial accelerated aging resistance time ≥ 1500 hours, other coating properties passed GB/T13492-92.

Example 2:

Metallic topcoat formulation with floppy effect 2

Ingredient parts by weight wt(%)

Nano particle dispersion slurry 7.4

Desmophen 650 (polyester resin) 37

Setamine133 (amino resin) 21.3

Metallux2154 (aluminum powder) 1.3

CAB381-0.5 (aluminum powder directional agent) 3.3

Solvent 30.6

Auxiliary 1.1

The above formula is prepared according to the preparation method proposed by the invention, and a metal topcoat with a color-dependent effect can be obtained. The color-dependent effect of the coating (visual inspection): good, stone chip resistance: ≤2 grades, gloss (Gloss 20°) 95, haze (Haze Hlog) 127, artificial accelerated aging resistance time ≥ 1500 hours, good wear resistance of the coating, other coating properties passed GB/T13492-92.

Example 3:

Metallic topcoat formula with floppy effect 3

Ingredient parts by weight wt(%)

Nano particle dispersion slurry 0.9

Desmophen 650 (polyester resin) 14

Setal173 (polyester resin) 12

Setamine133 (amino resin) 7.1

C1158 (amino resin) 2.6

Vestanat BI358A (modified resin) 6.9

SSP504-AR (aluminum powder) 7.7

CAB381-0.5 (aluminum powder directional agent) 2.5

CAB551-0.2 (aluminum powder directional agent) 4

Pearlescent Pigment 3

Solvents 36.9

Additives 2.4

The above formula is prepared according to the preparation method proposed by the invention, and a metal topcoat with a color-dependent effect can be obtained. The color-dependent effect of the coating (visual inspection): good, stone chip resistance: ≤2 grades, gloss (Gloss 20°) 96, Haze Hlog 189, artificial accelerated aging resistance time ≥ 1500 hours, other coating properties passed GB/T13492-92.

Claims (13)

1. A metal topcoat with a different color effect, characterized in that the amounts of each component are as follows: Composition Weight Percentage wt% Nano TiO ₂ particle dispersion slurry 0.5-10 Polyester resin 20-40 Amino resin 3-20 Blocked isocyanate modified resin 0-10 Aluminum powder 1-10 Orienting agent 1-10 Solvent 30-60 Pigment and filler 0-10 Auxiliary 0.1-3, The nano TiO ₂ particle dispersion slurry is composed of dispersion resin, rutile nano TiO ₂ powder, another 0-2 kinds of inorganic nanoparticles, dispersant and solvent. 2. The top paint according to claim 1, characterized in that all the inorganic nanoparticles have a particle size in the range of 10-150nm. 3. A method for preparing a metallic topcoat with an angle-dependent color effect, characterized in that nano- _TiO2 particle dispersion slurry is mixed with polyester resin, amino resin, blocked isocyanate modified resin, aluminum powder, auxiliary agent anti-settling agent , orienting agent, solvent, pigment and filler, auxiliary agent are combined, and the consumption of each component is as claim 1; Concrete preparation process is as follows: In the dispersion kettle, accurately weigh the polyester resin, amino resin, and blocked isocyanate modified resin according to the proportion, add part of the solvent and stir evenly; then use part of the solvent to dissolve other additives except the anti-settling agent, and add the above resin liquid middle; then add nano-TiO ₂ particle dispersion slurry, stir at 1000-2000rpm at low speed for 10-20 minutes, then stir at 3000-5000rpm at high speed for 1-3 hours, then add the aluminum powder, pigment and filler prepared with directional agent, Stir at 100-500rpm, add additives and anti-sedimentation agents, and stir thoroughly for 1-2 hours to prepare a metal finish with an angle-dependent effect. The nano-particle dispersion slurry is composed of dispersion resin, rutile nano- _TiO2 powder, and It is composed of 0-2 kinds of inorganic nanoparticles, dispersant and solvent. After each component is added, it is completed through wetting, dispersion, stirring, ultrasonication, and grinding processes to prepare stable and transparent nano-TiO ₂ slurry. The particle size of all inorganic nanoparticles is 10-300nm. 4. The method according to claim 3, characterized in that the polyester resin is a saturated polyester resin with a hydroxyl content of 2-7 wt%, and one or more of them are used in combination. 5. The method according to claim 3, characterized in that the amino resin is butylated melamine resin, and one or more of them are used in combination. 6. The method according to claim 3, characterized in that the modified resin is a blocked isocyanate with an NCO content of 2-10 wt%, any one of which is selected. 7. The method according to claim 3, characterized in that the aluminum powder is flake non-floating aluminum powder, and any one of them is selected. 8. The method of claim 3 wherein the orienting agent is a cellulose acetate butyrate compound. 9. The method according to claim 3, characterized in that the solvent is ester or alcohol ether, and two or more of them are used in combination. 10. The method according to claim 3, characterized in that the pigments and fillers are pearlescent pigments or other conventional pigments and fillers for coatings. 11. The method according to claim 3, characterized in that the other additives other than the anti-sedimentation agent are dispersants, wetting agents, leveling agents, and anti-blast agents. 12. The method according to claim 3, characterized in that the prepared metal topcoat with color-flop effect is applied to the surface of the material by brushing, dipping, showering or spraying. 13. The metal finish paint according to claim 1 is applied to car finish paint and metal exterior decoration paint.

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