A high-temperature electroplated silver paint for magnesium-aluminum alloy used in vehicles

Abstract

The present invention belongs to the technical field of coatings, and in particular relates to a high-temperature electroplated silver paint made of magnesium-aluminum alloy for use in vehicles. The silver paint includes a primer, a mid-coat and a topcoat: the primer includes the following components calculated in parts by mass: 10-20 parts of polyester resin, 25-35 parts of thermosetting acrylic resin, 9-16 parts of amino resin, 3-6 parts of epoxy resin, 20-25 parts of semi-finished product color paste, 4-10 parts of organic solvent, and 11-21 parts of other additives; the mid-coat includes the following components calculated in parts by mass: 35-45 parts of baking varnish electroplating silver resin, 20-25 parts of polyester resin, 5-8 parts of amino resin, 4-6 parts of silver paste, 21-31 parts of organic solvent, and 0.3-0.8 parts of leveling agent; the topcoat includes the following components calculated in parts by mass: 13-20 parts of thermosetting acrylic resin, 30-38 parts of polyester resin, 10-15 parts of modified polyester resin, 18-27 parts of amino resin, 10-17 parts of organic solvent, and 0.6-1.8 parts of other additives. The invention has a very good metallic texture, can be stored for a long time in a high temperature environment without turning yellow, and can meet the durability test in a high temperature and high humidity environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a high-temperature electroplated silver paint made of magnesium-aluminum alloy for use in vehicles. Background Art

[0002] At present, the surface coatings of magnesium alloy materials used in vehicles on the market are mainly low-temperature two-component (baking below 100°C) paints. As the performance test requirements of automotive interior parts (magnesium alloy materials) are getting higher and higher, such as the product needs high-temperature 120°C*500 hours of durability testing, and 360 hours of storage in a high-temperature and high-humidity environment of 85°C*85 parts RH, low-temperature two-component paints are gradually unable to meet the test requirements. In addition, low-temperature two-component paints need to be added with a curing agent, and the shelf life is short after dilution. Single-component high-temperature paints do not have such problems. Since the shell of the on-board central control screen of new energy vehicles requires a high metallic texture effect, there is an urgent need to provide a high-temperature single-component electroplated silver paint. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a high-temperature electroplated silver paint made of magnesium-aluminum alloy for use in vehicles. The silver paint has a very good metallic texture, can be stored for a long time in a high-temperature environment without turning yellow, and can meet the durability test in a high-temperature and high-humidity environment.

[0004] The present invention solves the above problems through the following technical solutions:

[0005] The present invention provides a high-temperature electroplated silver paint for magnesium-aluminum alloy for use in vehicles, comprising a primer, a mid-coat, and a topcoat, and may further comprise a diluent:

[0006] The raw materials for preparing the primer include the following components calculated by mass: 10-20 parts of polyester resin, 25-35 parts of thermosetting acrylic resin, 9-16 parts of amino resin, 3-6 parts of epoxy resin, 20-25 parts of semi-finished product color paste, 4-10 parts of organic solvent, and 11-21 parts of other additives.

[0007] The raw materials for preparing the intermediate paint include the following components calculated by mass: 35-45 parts of baking paint electroplating silver resin, 20-25 parts of polyester resin, 5-8 parts of amino resin, 4-6 parts of silver paste, 21-31 parts of organic solvent, and 0.3-0.8 parts of leveling agent.

[0008] The raw materials for preparing the topcoat include the following components calculated by mass: 13-20 parts of thermosetting acrylic resin, 30-38 parts of polyester resin, 10-15 parts of modified polyester resin, 18-27 parts of amino resin, 10-17 parts of organic solvent, and 0.6-1.8 parts of other additives.

[0009] Furthermore, in the primer, the polyester resin is preferably SN800 polyester resin, which has excellent interlayer adhesion and good chemical resistance.

[0010] Furthermore, in the primer, the thermosetting acrylic resin is an epoxy-modified acrylic resin; preferably ZJ-103 epoxy-modified acrylic resin, which has the characteristics of good corrosion resistance, good salt spray resistance, excellent interlayer adhesion, and good chemical resistance.

[0011] Furthermore, in the primer, the amino resin includes 4-7 parts by weight of ETERMINO 9412-70 amino resin and 5-9 parts by weight of R717 amino resin.

[0012] Furthermore, in the primer, the epoxy resin is preferably 901-75 epoxy resin to improve adhesion to the magnesium alloy substrate.

[0013] Furthermore, in the primer, the semi-finished color paste includes 25-35 parts by weight of propylene glycol methyl ether acetate, 5-8 parts by weight of pigment dispersant, 20-25 parts by weight of polyester resin, 0.5-2 parts by weight of anti-sagging and anti-settling additive, 10-15 parts by weight of carbon black powder, and 8-12 parts by weight of ultrafine zinc phosphate; the above-mentioned semi-finished color paste is preferably ground to less than 10 microns before use.

[0014] Furthermore, in the primer, the organic solvent includes 2-5 parts by weight of butyl acetate and 2-5 parts by weight of isobutanol.

[0015] Furthermore, in the primer, other additives include 2-5 parts by weight of an epoxy-modified phosphate additive, 1-3 parts by weight of a polyester-modified acid ester additive, 0.3-0.8 parts by weight of an acrylic leveling agent, and 8-12 parts by weight of talc; wherein the epoxy-modified phosphate additive can improve the adhesion and water resistance of the paint film to the substrate; the polyester-modified acid ester additive can improve the salt spray resistance and water resistance of the paint film; the leveling agent is preferably an acrylic leveling agent; and the talc is preferably 3000 mesh talc to improve the filling property of the substrate.

[0016] Furthermore, in the intermediate paint, the baking varnish electroplated silver resin is A-850B-1 baking varnish electroplated silver resin, which has the characteristics of good silver arrangement and good chemical resistance.

[0017] Furthermore, in the mid-coat, the amino resin is CY1158 amino resin.

[0018] Furthermore, in the intermediate paint, the organic solvent includes 12-16 parts by weight of butyl acetate, 3-5 parts by weight of isobutyl alcohol, and 6-10 parts by weight of methyl isobutyl ketone.

[0019] Furthermore, in the mid-coat, the leveling agent is preferably an acrylic leveling agent.

[0020] Furthermore, in the topcoat, the thermosetting acrylic resin is preferably ZHB-213, which has good chemical resistance and good adhesion.

[0021] Furthermore, in the topcoat, the polyester resin is preferably 1606BA80 polyester resin, which has the characteristics of good weather resistance and high fullness.

[0022] Furthermore, in the topcoat, the modified polyester resin is 173VS60 modified polyester resin, which has the characteristics of high hardness and good adhesion.

[0023] Furthermore, in the topcoat, the amino resin includes 8-12 parts by weight of ETERMINO 9412-70 amino resin and 10-15 parts by weight of R717 amino resin.

[0024] Furthermore, in the topcoat, the organic solvent includes 8-12 parts by weight of propylene glycol methyl ether acetate and 2-5 parts by weight of isobutanol.

[0025] Furthermore, in the topcoat, other additives include 0.1-0.5 parts by weight of an organosilicon-modified leveling agent, 0.3-0.8 parts by weight of an ultraviolet light absorber, and 0.2-0.5 parts by weight of an ultraviolet light stabilizer.

[0026] The beneficial effects of the present invention are as follows: the primer of the present invention has excellent interlayer adhesion to the magnesium alloy substrate and the topcoat paint, can have good filling properties on the surface of the magnesium alloy substrate, and can ensure that the overall paint film has good chemical resistance; the baking paint electroplated silver resin selected for the midcoat of the present invention has good silver powder arrangement and good chemical resistance, and is combined with high-grade imitation electroplating silver paste and auxiliary resin to achieve good interlayer adhesion, so that a midcoat with high metallic texture can be formulated; the topcoat of the present invention improves the fullness of the varnish by selecting a polyester resin with excellent weather resistance, and improves the surface hardness and chemical resistance of the paint film by combining an appropriate amount of thermosetting acrylic resin with good chemical resistance. By combining the above components, the high-temperature electroplated silver paint for magnesium-aluminum alloy used in vehicles has a very good metallic texture, can be stored for a long time without yellowing in a high-temperature environment, and can meet the durability test in a high-temperature and high-humidity environment. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to specific embodiments. The embodiments are only preferred embodiments of the present invention and are not intended to limit the present invention.

[0028] Examples 1-3 of the high-temperature electroplated silver paint for magnesium-aluminum alloy used in vehicles of the present invention are shown in Table 1 below:

[0029] Table 1

[0030]

[0031]

[0032] The formula of the semi-finished color paste in the primer of Examples 1-3 is shown in Table 2 below:

[0033] Table 2

[0034]

[0035] The primer raw materials were stirred and dispersed, and the ratio of primer to diluent (butyl acetate 45wt%, ethyl acetate 10wt%, methyl isobutyl ketone 15wt%, isobutyl alcohol 10wt%, propylene glycol methyl ether acetate 20wt%) was set to 10:5-7 (weight ratio), and the viscosity was 12 seconds (Yantian 2# cup). The primer was sprayed on a vehicle-mounted magnesium alloy substrate and dried at 150°C for 20 minutes.

[0036] Stir and disperse the above-mentioned medium paint raw materials, and adjust the oil ratio of medium paint: diluent (butyl acetate 45wt%, ethyl acetate 10wt%, methyl isobutyl ketone 15wt%, isobutyl alcohol 10wt%, propylene glycol methyl ether acetate 20wt%) = 10:8-10 (weight ratio), with a viscosity of 12 seconds (Yantian 2# cup), spray the above-mentioned medium paint on the above-mentioned primer and dry it, and the baking condition is 150℃*20 minutes;

[0037] The above-mentioned topcoat raw materials were stirred and dispersed, and the oil ratio of topcoat: diluent (butyl acetate 60wt%, isobutyl alcohol 10wt%, propylene glycol methyl ether acetate 25wt%, dibasic acid ester DBE 5wt%) was adjusted to 10:5-7 (weight ratio), and the viscosity was 13 seconds (Yantian 2# cup). The above-mentioned topcoat was sprayed on the above-mentioned midcoat and dried, and the baking condition was 160℃*40 minutes;

[0038] The vehicle-mounted magnesium-aluminum alloy high-temperature electroplated silver paint of the present invention is obtained.

[0039] In order to evaluate the technical effects of the present invention, the following performance tests were performed on the embodiments:

[0040] 1. Construction application: Check the suitability of the leveling and baking conditions of the paint film, the suitability of the drying conditions, and evaluate the appearance effect.

[0041] 2. Glossiness: Measurement angle: 60°.

[0042] 3. Adhesion test: Take three finished products or three 150mm×100mm specimens, score them according to ISO 2409 standard, and quickly pull off the adhesive tape.

[0043] 4. Hardness test: Use a Chinese pencil (UNI series) H hardness, 45° angle, 1000g load to draw three 3-5cm lines on the surface of the sample from different directions. The paint film should not be obviously scratched.

[0044] 5. Friction resistance test: The friction head consists of a cylinder with a diameter of (16±0.1) mm, the applied pressure is (9±0.2) N, the linear reciprocating stroke is (104±3) mm, and the grayscale level is ≥4.

[0045] 6. Wear test: Use RCA7-1BB RCA paper tape abrasion tester, apply 175 grams of force, drive the paper tape to rub the surface of the sample, and test the paint film coverage of the sample part after 50 times.

[0046] 7. High and Low Temperature Impact Resistance Test: Take three finished products or three 150mm x 100mm specimens and perform 20 cycles of alternating high and low temperature testing under the following conditions. After the test, inspect the sample appearance and proceed to the adhesion test. (Test process description: Temperature 23°C, 30% humidity, 40 minutes; 30% humidity, temperature from 23°C to -35°C, time 90 minutes; -35°C, 30% humidity, 60 minutes; 80% humidity, temperature rise to 50°C, time 80 minutes; 50°C, 80% humidity, 120 minutes; 30% humidity, temperature rise to 80°C, time 30 minutes; 80°C, 240 minutes; 30% humidity, cooling to 23°C, time 60 minutes. One cycle.)

[0047] 8. Condensation water resistance test: Take the finished product or three 150mm×100mm specimens and test them according to the constant humidity condensation test method specified in standard ISO 6270-2. The temperature is 40±3℃ and the test time is 240 hours. After the test, place them at room temperature for 30 minutes, check the appearance of the samples and continue with the adhesion test.

[0048] 9. Chemical resistance test: Use a pipette to drop 0.1 ml of the corresponding chemical (surfactant, perfume, window cleaner, denatured alcohol, artificial sweat pH 4.7, artificial sweat pH 8.8) on the sample. After 10 minutes, place it in 60℃ circulating air to dry for 30 minutes. After loading for 24 hours, evaluate whether the surface condition has not changed.

[0049] 10. Salt spray resistance test: The samples are tested in a salt spray chamber for 96 hours.

[0050] 11. Moisture and heat resistance test: The samples are stored and tested in a high temperature and humidity environment of 85℃*85%RH for 360 hours. After the test, the appearance of the samples is inspected and the adhesion test is continued.

[0051] 12. High temperature resistance test: The samples are stored and tested in a high temperature environment of 120℃*500 hours. After the test, the appearance of the samples is checked and the adhesion test is continued.

[0052] 13. Boiling resistance test: The sample is placed in a water bath at 100℃ for 2 hours. After the test, the appearance of the sample is checked and the adhesion test is continued.

[0053] 14. Light resistance test: The sample is exposed to light at a power of 1.25w / m2*420nm*temperature scale 100℃*500 hours. After the test, check the appearance of the sample and continue with the adhesion test.

[0054] 15. Hand Cream and Sunscreen Resistance Test: Hand cream and sunscreen set model: PM001, manufacturer: Dr.schroder Cosmetica Gmbh Co. (Gauze model: REF60003 (yarn count 20), manufacturer: LEINA-WERKE Gmbh); three 150 mm × 100 mm samples were collected, each covered with a layer of special gauze, and the special hand cream and sunscreen were evenly applied. The samples were then placed at 80°C for 24 hours. After cooling to room temperature, any oil stains were cleaned, the samples were inspected for appearance, and adhesion testing was performed.

[0055] The test results are shown in Table 2 below:

[0056] Table 2

[0057]

[0058]

[0059] It will be understood that the above specific embodiments are all further explanations of the present invention and are not intended to limit the scope of protection of the present invention. For those skilled in the art, all other modifications and alterations obtained without creative work fall within the scope of protection of the present invention.

Claims

1. A high-temperature electroplated silver paint for magnesium-aluminum alloy for vehicle use, characterized in that: Including primer, midcoat and topcoat: The raw materials for preparing the primer include the following components calculated by mass: 10-20 parts of polyester resin, 25-35 parts of thermosetting acrylic resin, 9-16 parts of amino resin, 3-6 parts of epoxy resin, 20-25 parts of semi-finished product color paste, 4-10 parts of organic solvent, and 11-21 parts of other additives; The raw materials for preparing the intermediate paint include the following components calculated by mass: 35-45 parts of baking paint electroplating silver resin, 20-25 parts of polyester resin, 5-8 parts of amino resin, 4-6 parts of silver paste, 21-31 parts of organic solvent, and 0.3-0.8 parts of leveling agent; The raw materials for preparing the topcoat include the following components calculated by mass: 13-20 parts of thermosetting acrylic resin, 30-38 parts of polyester resin, 10-15 parts of modified polyester resin, 18-27 parts of amino resin, 10-17 parts of organic solvent, and 0.6-1.8 parts of other additives; In the topcoat, the modified polyester resin is 173VS60 modified polyester resin.

2. The high-temperature electroplated silver paint for magnesium-aluminum alloy for vehicles according to claim 1, characterized in that: In the primer, the thermosetting acrylic resin is epoxy-modified acrylic resin.

3. The high-temperature electroplated silver paint for magnesium-aluminum alloy for vehicles according to claim 1, characterized in that: In the primer, the amino resin includes 4-7 parts by weight of ETERMINO 9412-70 amino resin and 5-9 parts by weight of R717 amino resin.

4. The high-temperature electroplated silver paint for magnesium-aluminum alloy for vehicles according to claim 1, characterized in that: In the primer, the semi-finished color paste includes 25-35 parts by weight of propylene glycol methyl ether acetate, 5-8 parts by weight of pigment dispersant, 20-25 parts by weight of polyester resin, 0.5-2 parts by weight of anti-sagging and anti-settling additive, 10-15 parts by weight of carbon black powder, and 8-12 parts by weight of ultrafine zinc phosphate.

5. The high-temperature electroplated silver paint for magnesium-aluminum alloy for vehicles according to claim 1, characterized in that: In the primer, other additives include 2-5 parts by weight of epoxy modified phosphate additive, 1-3 parts by weight of polyester modified acid ester additive, 0.3-0.8 parts by weight of acrylic leveling agent, and 8-12 parts by weight of talc.

6. The high-temperature electroplated silver paint for magnesium-aluminum alloy used in vehicles according to claim 1, characterized in that: In the intermediate paint, the baking varnish electroplating silver resin is A-850B-1 baking varnish electroplating silver resin.

7. The high-temperature electroplated silver paint for magnesium-aluminum alloy used in vehicles according to claim 1, characterized in that: In the mid-coat, the amino resin is CY1158 amino resin.

8. The high-temperature electroplated silver paint for magnesium-aluminum alloy used in vehicles according to claim 1, characterized in that: In the topcoat, the amino resin includes 8-12 parts by weight of ETERMINO 9412-70 amino resin and 10-15 parts by weight of R717 amino resin.

9. The high-temperature electroplated silver paint for magnesium-aluminum alloy for vehicles according to claim 1, characterized in that: In the topcoat, other additives include 0.1-0.5 parts by weight of an organosilicon-modified leveling agent, 0.3-0.8 parts by weight of an ultraviolet light absorber, and 0.2-0.5 parts by weight of an ultraviolet light stabilizer.

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