Matt varnish for veneer automotive trim and application

Abstract

The invention relates to matte varnish for high-grade veneer automotive interiors and application of the matte varnish. The coating is prepared from the following raw materials: acrylic resin, polyester resin, polyisocyanate, a delustering agent, a directional auxiliary agent, an ultraviolet light absorber and the like. According to the invention, acrylic resin is used as matrix resin and does not contain benzene substances, so that the coating does not cause harm to the health of a user; the polyester resin is added to improve the toughness of the paint film and improve the matching performance with the base paint; polyisocyanate is added to cure the paint film; by adding the delustering agent, the gloss of the varnish film is adjusted to be matte, and the transparency of the varnish film is ensured; the ultraviolet absorbents with the absorbing and shielding functions aiming at different nanometer wave bands are added, most of 290-349 nanometer light waves are absorbed and shielded, and the problem that natural wood veneers and technical wood are prone to discoloring is solved; all the raw materials do not contain benzene substances, the paint and the coating have the characteristics of no toxicity and environmental protection, and the targeted ultraviolet shielding function protects a workpiece from discoloration and gloss loss.

Description

Technical Field

[0001] The invention belongs to the application field of matte varnish for automobile interior, and relates to high-end matte varnish for automobile interior comprising hydroxy acrylic resin, polyester resin, polyisocyanate, water absorption stabilizer, dispersant, matting agent, leveling agent, defoamer, ultraviolet absorber, anti-settling wax and organic solvent, and a preparation method thereof. Background Art

[0002] At present, the interior decoration of passenger vehicles is mostly made of ABS, ABS+PC, PP, veneer, leather and other materials. Some high-end cars use solid wood veneer and technical wood veneer as interior decoration. For this kind of material interior coating, translucent water-based base paint and solvent-based matte varnish are generally used. Spraying matte varnish will make the interior decoration gloss softer, will not cause dazzling sunlight reflection, and can better protect the interior decoration. Since it is used inside the car, it is necessary to ensure that the interior decoration will not produce irritating odors and VOC substances that are harmful to the human body in the closed environment of the cockpit. The selected coating products should be non-toxic and environmentally friendly. The interior of the car will be exposed to sunlight for a long time, especially the veneer material is very easy to change color after exposure to light, and the matte varnish is also required to have good ultraviolet light wave shielding function.

[0003] Benzene-hydroxyl-free acrylic resin is selected as the main resin. The resin itself does not contain styrene and other benzene series. The selected resin has a low hydroxyl content, is easier to prepare into matte varnish, and has good resistance to artificial accelerated aging.

[0004] The use of polyester resin improves the flexibility of the paint film, making the modulated matte varnish have good adhesion to various base paints, and can be matched with solvent-based base paints and water-based base paints; the selected polyester resin also does not contain any benzene series, ensuring low odor and low VOC for the interior parts after spraying the matte varnish.

[0005] The use of isocyanate as a cross-linking agent for hydroxy acrylic resin and polyester resin can solidify the paint film to form a dense paint film, thereby ensuring the various properties of the matte varnish coating.

[0006] Adding matting agent reduces the gloss of the paint film to a matte effect. The selected matting agent has excellent transparency, so it will not affect the color of the base paint.

[0007] Adding a dispersant makes it easier to disperse the added matting agent and reduces the viscosity of the paint after adding the matting agent, so that the paint film still has good leveling properties during spraying.

[0008] Adding anti-settling wax makes the matting agent have better arrangement effect and anti-settling property of the coating.

[0009] Due to the addition of matting agents and anti-settling wax, which cause the paint to be thixotropic, a large number of bubbles are easily generated when the paint is stirred. Most of the bubbles in the varnish can be eliminated by adding defoaming agents.

[0010] Three UV absorbers with strong UV absorption effects in different nano-bands have been added. They have excellent absorption and shielding functions for UV waves in the entire band and effectively protect the veneer material.

[0011] By adding leveling agent, polyurea varnish has a good leveling effect, which greatly improves the decorativeness of the coating. Summary of the invention

[0012] The purpose of the present invention is to make the interior decoration parts soft and have good decorative effect by spraying matte varnish; because of its ultraviolet light shielding property, the interior decoration parts will not change color and lose gloss due to long-term sunlight, especially greatly improving the light resistance of wood veneer material; because its components do not contain benzene series, the automobile interior decoration parts sprayed with the present invention have low odor, low VOC, non-toxic and environmentally friendly properties. It is composed of benzene-free hydroxyl acrylic resin, polyester resin, polyisocyanate, matting agent, disperser, anti-settling wax, defoaming agent, ultraviolet absorber, leveling agent and benzene-free solvent.

[0013] To achieve the above purpose, the present invention discloses the following technical contents: A matte varnish for high-grade veneer car interior, characterized in that the coating is composed of the following raw materials in parts by weight: Main raw material ratio (1) Component 1: Benzene-free hydroxyl acrylic resin SWU3558 50-60 Polyester resin PA-198 8-10 Dispersant BYK-161 1.0-2.0 Butyl acetate 10-17 3-Ethoxypropionic acid ethyl ester 2-4 Defoamer P420 0.2-0.3 Leveling agent BYK-320 0.1-0.2 Matting agent OK-412 3.5-4.0 Anti-settling wax 6900-20 0.5-1.0 UV absorber Eversorb 40S 1.0 UV absorber Eversorb 81 2.0 UV absorber Eversorb 109 1.0 Ethyl acetate 7-8 (2) Component 2: Polyisocyanate HT-100 60 Butyl acetate 39.7 Water absorption stabilizer TI 0.3 (3) Construction ratio: Component 1 100 Component 2 10 Diluent Butyl Acetate 50-60 Description of the above ingredients: The benzene-free hydroxyl acrylic resin is SWU3558 from Sanwang Company, the polyester resin is PA-198 from Suzhou Jianxing Company, the polyisocyanate is HT-100 from Wanhua Company, the dispersant is BYK-161 from BYK Chemical, the matting agent is OK-412 from Degussa, the defoaming agent is P420 from Desbaron, the anti-settling wax is 6900-20 from Desbaron, the leveling agent is BYK-320 from BYK Chemical, the ultraviolet absorbers are Eversorb40S, Eversorb81 and Eversorb109 from Everlight Chemical, the water absorption stabilizer is Ti from Bayer, and the solvents are non-benzene solvents such as butyl acetate, ethyl acetate and ethyl 3-ethoxypropionate.

[0014] The present invention further discloses a method for preparing a matte varnish for automobile interior decoration made of high-grade veneer material, which is characterized by the following steps: (1) Preparation of component 1 Add benzene hydroxyl-free acrylic resin SWU3558 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add polyester resin PA-198, then add dispersant BYK-161, then add butyl acetate, then add ethyl 3-ethoxypropionate, then add defoamer P420, then add leveling agent BYK-320, then add matting powder OK-412 and then change to high speed 1200-1500 rpm for stirring for 30 minutes, then add anti-settling wax 6900-20, stir for 30 minutes, then add UV absorber Eversorb 40S, then add UV absorber Eversorb 81, then add UV absorber Eversorb109, then add ethyl acetate, stir for 10-20 minutes, filter and package after passing the test; (2) Preparation of component 2 Add butyl acetate to a stainless steel basin, then add water-absorbing stabilizer Ti, stir at a low speed of 300-500 rpm for 5 minutes, then add polyisocyanate HT-100, stir for 15-20 minutes, and then use filling to package according to the formula.

[0015] (3) Paint mixing during construction Add component 1 to the paint mixing tank, add component 2 and diluent butyl acetate according to the proportion, stir with a paint mixing stick for 1-2 minutes and then spray.

[0016] The present invention also discloses the application of a matte varnish for automobile interior decoration made of high-grade veneer in the field of automobile interior decoration. In particular, the application of the varnish is non-toxic and environmentally friendly, and preventing the veneer from changing color. The experimental results show that the materials used in the product of the present invention do not contain any benzene substances, and the paint film has the non-toxic and environmentally friendly characteristics of primer smell and low VOC; because solid wood veneer and technical wood veneer materials are very easy to change color, ultraviolet absorbers with different light band absorption functions are added to solve this problem, which effectively prevents the discoloration problem of veneer interior decoration parts.

[0017] The present invention uses benzene-free hydroxyl acrylic resin as the main resin, which does not contain styrene and any other benzene series. Because the hydroxyl content is only 1.7%, it is easier to be prepared into matte varnish, and the adhesion and weather resistance of the resin itself are also relatively excellent. By adding polyester resin PA-198, the adhesion between the matte varnish and various base paint coatings can be improved, and PA-198 polyester resin does not contain any benzene series, which also ensures the low odor and environmental protection characteristics of the paint film. By adding ultraviolet absorber Eversorb 40S, the paint film can shield most of the short-wave ultraviolet light. The ultraviolet absorber Eversorb 40S belongs to the triazine product and has an excellent absorption and shielding effect on the ultraviolet light waves in the energy band of 290-338 nanometers. By adding ultraviolet absorber Eversorb 81, the paint film can shield most of the medium and long-wave ultraviolet light. This product has an excellent absorption and shielding effect on the ultraviolet light waves in the band of 302-343 nanometers. By adding ultraviolet absorber Eversorb 109 can make the paint film shield most of the long-wave ultraviolet light. This product has an excellent absorption and shielding effect on the ultraviolet light waves in the band of 311-349 nanometers. By adding the matting agent OK-412, the gloss of the varnish film is reduced to matte, and the transparency of the matting agent OK-412 is very good and will not affect the color of the base paint. By adding the disperser BYK-161, the efficiency of dispersing the matting agent is improved, so that the fineness of the varnish after dispersion is lower, and the gloss stability of the matte varnish is also better. By adding the anti-settling wax 6900-20, the matting agent can be prevented from precipitating, and the directional arrangement effect of the matting agent is improved, making the appearance of the sprayed paint film more uniform and smooth. By adding the defoaming agent P420, the bubbles generated by the increase in viscosity caused by the addition of the matting agent and anti-settling wax in the matte varnish can be eliminated, thereby ensuring No bubbles, prickly heat and other paint defects will be generated during spraying; adding the leveling agent BYK-320 can make the paint film have better leveling properties during spraying, and it also has a certain defoaming function. Adding BYK-320 can improve the leveling properties of matte varnish without generating too many bubbles; adding polyisocyanate HT-100 can solidify the paint film; adding the water-absorbing stabilizer Ti can remove the trace moisture contained in the solvent, making the storage of the curing agent more stable; adjusting the viscosity of matte varnish by adding butyl acetate solvent; adding ethyl 3-ethoxypropionate can reduce the volatilization rate of matte varnish, making the paint film have better leveling properties after spraying; adding ethyl acetate can increase the surface drying rate of matte varnish, and using it with ethyl 3-ethoxypropionate can balance the volatilization rate, so that matte varnish has the characteristics of fast surface drying and is not easy to produce paint defects.

[0018] The matte varnish for automobile interior decoration made of high-grade veneer material disclosed in the present invention and its application have the following positive effects compared with the prior art: The invention does not contain any benzene series, and the automobile interior decoration parts sprayed with the invention have the characteristics of low odor and low VOC, ensuring that users will not receive any poisoning.

[0019] The construction scope is wider, and it can be constructed with both solvent-based basecoat and water-based basecoat.

[0020] It has excellent performance in artificial accelerated aging, artificial radiation exposure, and sunlight simulation tests, especially for veneer materials, and can effectively reduce the degree of discoloration. DETAILED DESCRIPTION

[0021] The present invention is described below by specific embodiments. Unless otherwise specified, the technical means used in the present invention are methods known to those skilled in the art. In addition, the embodiments should be understood as illustrative rather than limiting the scope of the present invention, and the essence and scope of the present invention are limited only by the claims. For those skilled in the art, various changes or modifications to the material composition and dosage in these embodiments, without departing from the essence and scope of the present invention, also belong to the protection scope of the present invention.

[0022] The raw materials and reagents used in the present invention are all commercially available, wherein the benzene hydroxyl-free acrylic resin SWU3558 was purchased from Sanwang Resin Company, the polyester resin PA-198 was purchased from Suzhou Jianxing Resin Chemical Technology Company, the ultraviolet absorbers Eversorb40S, Eversorb 81, and Eversorb 109 were purchased from Yongguang Chemical Company, the matting agent OK-412 was purchased from Degussa, the dispersant BYK-161 was purchased from BYK Chemical Company, the anti-settling wax 6900-20 was purchased from Desbaron Company, the defoaming agent P420 was purchased from Desbaron Company, the leveling agent BYK-320 was purchased from BYK Chemical Company, butyl acetate and ethyl acetate were purchased from Tairong Chemical Company, 3-ethoxyethyl propionate was purchased from Bijia Trading Company, the water absorption stabilizer Ti was purchased from Bayer Company, and the curing agent polyisocyanate HT-100 was purchased from Wanhua Chemical Company. Example

[0023] Matt varnish for high-grade veneer car interior Main raw material ratio: (1) Preparation of component 1 Benzene-free hydroxyl acrylic resin SWU3558 55 Polyester resin PA-198 9 Dispersant BYK-161 1.85 Butyl acetate 14.65 3-Ethoxypropionic acid ethyl ester Defoamer P420 0.3 Leveling agent BYK-320 0.2 Matting agent OK-412 3.7 Anti-settling wax 6900-20 0.8 UV absorber Eversorb 40S 1.0 UV absorber Eversorb 81 2.0 UV absorber Eversorb 109 1.0 Ethyl acetate 7.5 Preparation of component 2 Polyisocyanate HT-100 60 Butyl acetate 39.7 Water absorption stabilizer TI 0.3 Construction ratio Component 1 100 Component 2 10 Diluent Butyl Acetate 50 Example

[0024] Preparation method of matte varnish for high-grade veneer material automobile interior (1) Preparation of component 1 Add benzene hydroxyl-free acrylic resin SWU3558 into a stainless steel basin according to the formula, stir at a low speed of 300-500 rpm, then add polyester resin PA-198, then add butyl acetate, then add ethyl 3-ethoxypropionate, then add dispersant BYK-161, stir for 10-15 minutes to ensure that the dispersant and the resin base are evenly mixed, then add matting agent OK-412. Matting agent OK-412 is a powder material and needs to be added slowly, then add defoamer P-420, then add leveling agent BYK-320, stir at a high speed of 1200-1500 rpm, stir for 30-60 minutes, add anti-settling agent 6900-20 after testing the fineness ≤25μm, continue stirring for 30-60 minutes, add ultraviolet absorbers Eversorb 40S, Eversorb 81, Eversorb after testing the fineness ≤25μm 109, after adding ethyl acetate, stir at a low speed of 300-500 rpm for 10-20 minutes, filter and package after passing the test; (2) Preparation of component 2 Add butyl acetate in a stainless steel basin according to the formula, stir at a low speed of 300-500 rpm, then add water-absorbing stabilizer Ti, stir for 5-10 minutes, then add polyisocyanate HT-100, stir for 15-20 minutes, and package using a filling machine.

[0025] (3) Paint mixing during construction Add component 1, component 2, and finally diluent butyl acetate into the paint mixing tank according to the ratio. Stir for 3-5 minutes with pneumatic stirring, test the viscosity, and control the working fluid viscosity at T-4 cup viscosity 15-16S.

[0026] Main technical parameters:

[0027]

[0028]

[0029] Example 3 Examples of practical applications

[0030] Through the above data comparison, the matte varnish of the present invention is superior to the matte varnish products on the market in terms of odor test, VOC test and aging resistance.

[0031] Conclusion: The matte varnish for automobile interior decoration made of high-grade veneer prepared by the present invention has excellent performance and meets the quality standards of interior decoration products of most passenger car manufacturers; it does not contain any benzene series, and the paint film has the characteristics of low odor and low VOC, ensuring that the automobile interior decoration sprayed with this product will not cause health hazards to users; it has good absorption and shielding effects on ultraviolet light waves of the entire band, avoiding the problem of significant discoloration of interior decoration made of technical wood veneer and solid wood veneer after long-term exposure to light.

Claims

1. A matte varnish for high-grade veneer car interior, characterized in that The primer is composed of the following raw materials in parts by weight: Main raw material ratio (1) Component 1: Benzene-free hydroxyl acrylic resin SWU3558 50-60 Polyester resin PA-198 8-10 Dispersant BYK-161 1.0-2.0 Butyl acetate 10-17 3-Ethoxypropionic acid ethyl ester 2-4 Defoamer P420 0.2-0.3 Leveling agent BYK-320 0.1-0.2 Matting agent OK-412 3.5-4.0 Anti-settling wax 6900-20 0.5-1.0 UV absorber Eversorb 40S 1.0 UV absorber Eversorb 81 2.0 UV absorber Eversorb 109 1.0 Ethyl acetate 7-8 Component 2: Polyisocyanate HT-100 60 Butyl acetate 39.7 Water absorption stabilizer TI 0.3 Construction ratio: Component 1 100 Component 2 10 Diluent: butyl acetate 50-60.

2. The method for preparing a matte varnish for high-grade veneer automobile interior decoration according to claim 1, characterized in that Proceed as follows: (1) Preparation of component 1: Add benzene-free hydroxyl acrylic resin SWU3558 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add polyester resin PA-198, then add dispersant BYK-161, then add butyl acetate, then add ethyl 3-ethoxypropionate, then add defoamer P420, then add leveling agent BYK-320, then add matting powder OK-412 and then change to high speed 1200-1500 rpm for stirring for 30 minutes, then add anti-settling wax 6900-20, stir for 30 minutes, then add UV absorber Eversorb 40S, then add UV absorber Eversorb 81, then add UV absorber Eversorb 109, then add ethyl acetate, stir for 10-20 minutes, filter and package after passing the test; (2) Preparation of component 2: Add butyl acetate to a stainless steel basin, then add water-absorbing stabilizer Ti, stir at a low speed of 300-500 rpm for 5 minutes, then add polyisocyanate HT-100, stir for 15-20 minutes, and then use filling to package according to the formula; (3) Paint mixing: Add component 1 to the paint mixing tank, add component 2 and diluent butyl acetate according to the proportion, stir with a paint mixing stick for 1-2 minutes and then spray.

3. Use of the matte varnish for automobile interior made of high-grade veneer material as claimed in claim 1 in automobile interior.

4. Use of the matte varnish for automobile interior decoration made of high-grade veneer material as claimed in claim 1 to prevent discoloration of solid wood veneer and technical wood veneer.

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