A color-fixing primer and coating process for stained veneer / technical veneer

Abstract

This invention belongs to the field of furniture coating technology, specifically disclosing a color-fixing primer and coating process for dyed veneer / technical veneer. The color-fixing primer comprises 38-45 wt% water-based acrylic resin, 0.2-0.6 wt% water-based wetting agent, 0.05-0.25 wt% water-based defoamer, 40-50 wt% ethanol, 4-9 wt% ethylene glycol monobutyl ether, 1-5 wt% ultraviolet absorber, and 4-10 wt% deionized water. The coating process for dyed veneer / technical veneer includes the following steps: surface sanding and profile sanding; spraying / rolling the color-fixing primer; spraying / rolling the water-based sealing primer; rolling UV putty; primer sanding; first roller application of UV primer; second roller application of UV primer; primer sanding; topcoat color correction; and spraying the clear topcoat. The color-fixing primer process of this invention can relax the requirements for dyed veneer / technical veneer during the process construction, reduce production costs, and ensure process stability; compared with ordinary solid wood products, the coating process of this invention has higher overall production efficiency and shorter construction cycle.

Description

Technical Field

[0001] This invention belongs to the field of furniture coating technology, specifically relating to a color-fixing primer and coating process for stained veneer / technical veneer. Background Technology

[0002] Dyed veneer is a new type of material that utilizes high-tech processing techniques to dye and treat defects in natural veneer, resulting in a beautiful and refined product. It retains the texture of natural wood veneer while also correcting some of its imperfections. Dyed veneer can change color without altering the natural wood grain, and its diverse colors enrich designers' color imagination, enhance the veneer's inherent value, and add color to the living environment. Technological veneer refers to a new type of wood material with superior performance, produced through high-tech processing and beautification of ordinary wood using biomimetic principles. Veneers made from technological wood are called technological veneer. Although the patterns on technological veneer are computer-simulated, they possess the unique texture, grain, and color of wood, and come in a wide variety of types, from red beech and sapele to ebony and rosewood, all reproduced lifelike and suitable for mass production. As a new generation of decorative material, technological veneer can be used not only for engineered wood panels and furniture veneers but also for curved surfaces, irregular shapes, and interior wall decoration. Dyed veneer and engineered veneer are made from natural veneer or natural wood through processes such as bleaching, dyeing, compounding, slicing, and rotary cutting. The processing affects the resistance of wood fibers to ultraviolet aging.

[0003] Currently, the yellowing resistance of existing dyed veneer and engineered veneer on the market varies greatly. Customers often experience yellowing after using these veneers as decorative surfaces. The current market solution primarily focuses on addressing the yellowing issue by selecting high-quality dyed and engineered veneer for the coating process. However, this method significantly increases overall production costs, and the manufacturing process for dyed and engineered veneer is not very stable, easily leading to color variations between different batches.

[0004] Therefore, it is necessary to develop a color-fixing primer and coating process for stained veneer / technical veneer to meet the demand. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the existing technology and provide a color-fixing primer and coating process for dyed veneer / technical veneer.

[0006] To achieve the above objectives, one of the technical solutions of the present invention is: a color-fixing primer for dyed veneer / technological veneer, comprising 38-45 wt% water-based acrylic resin, 0.2-0.6 wt% water-based wetting agent, 0.05-0.25 wt% water-based defoamer, 40-50 wt% ethanol, 4-9 wt% ethylene glycol monobutyl ether, 1-5 wt% ultraviolet light absorber, and 4-10 wt% deionized water.

[0007] In a preferred embodiment of the present invention, the color-fixing primer comprises 40-42 wt% waterborne acrylic resin, 0.3-0.5 wt% waterborne wetting agent, 0.1-0.2 wt% waterborne defoamer, 45-47 wt% ethanol, 5-8 wt% ethylene glycol monobutyl ether, 2-3 wt% ultraviolet light absorber, and 5-8 wt% deionized water.

[0008] In a preferred embodiment of the present invention, the waterborne acrylic resin is a high-performance waterborne acrylic resin with high yellowing resistance, strong permeability, and fast drying.

[0009] More preferably, the waterborne acrylic resin is at least one of E0544 produced by Yoshida Chemical and 832G produced by Jili Chemical.

[0010] In a preferred embodiment of the present invention, the aqueous wetting agent is an alkylphenol polyoxyethylene ether polymer material.

[0011] More preferably, the aqueous wetting agent is at least one of BYK349, BYK346, and BYK333 produced by BYK Chemical.

[0012] In a preferred embodiment of the present invention, the aqueous defoamer is a modified polysiloxane.

[0013] More preferably, the aqueous defoamer is at least one of BYK020, BYK021, and BYK025 produced by BYK Chemical.

[0014] In a preferred embodiment of the present invention, the ultraviolet light absorber is at least one of UV-531, T-292, T-400, and T-384-2.

[0015] To achieve the above objectives, the second technical solution of the present invention is: the application of the above-mentioned color-fixing primer in the coating process of dyed veneer / technological veneer.

[0016] To achieve the above objectives, the third technical solution of the present invention is: a coating process for dyed veneer / technological veneer, comprising the following steps:

[0017] (1) Sand the stained veneer / technical veneer with both flat and irregular sanding to ensure a smooth surface that is easy to coat;

[0018] (2) Spray / roll coat a color-fixing primer on the board surface that has been sanded in step (1), and bake it to improve the yellowing resistance of the stained veneer / technical veneer;

[0019] (3) Spraying / rolling water-based sealing primer onto the surface of the color-fixing primer after step (2) can prevent moisture from entering and play an anti-alkali barrier role to prevent the alkali from the wood from damaging the coating.

[0020] (4) Apply UV putty to the surface of the water-based sealing primer applied in step (3) to fill in the uneven application of the sealing primer in step (3) and the exposed parts of the substrate.

[0021] (5) Sand the surface treated in step (4) with primer in order to increase the adhesion of subsequent paint.

[0022] (6) First roll coating of UV primer: Compared with ordinary PU and PE transparent paint, UV primer has less volatile substances, is non-toxic and odorless, will not harm human health, does not pollute the environment, and has a full, crystal clear, and flexible film. It is also water-resistant, wear-resistant, aging-resistant, yellowing-resistant, fast-drying, and easy to use. The first roll coating of UV primer is semi-dry.

[0023] (7) Second roll coating of UV primer: After the infrared leveling of the UV primer in step (6) for 5-10 minutes, no sanding is required. Apply the second roll coating of UV primer directly. The purpose is to increase the fullness of the paint film. The second UV primer needs to be completely dry.

[0024] (8) Apply primer to the surface treated in step (7);

[0025] (9) Apply topcoat color correction to the above-mentioned samples that need to have their wood veneer color adjusted, just to reduce the impact of color inconsistency caused by different batches of wood veneer.

[0026] (10) Spraying clear topcoat: This is the last clear topcoat in the process. It can be applied according to the gloss requirements. It is mainly to protect the veneer from scratches and to achieve the decorative effect of paint.

[0027] To achieve the above objectives, the fourth technical solution of the present invention is: a composite paint film obtained by the above coating process, wherein the composite paint film comprises, from the inside to the outside, a color-fixing primer, a sealing primer, a UV primer and a topcoat.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) The color-fixing primer of the present invention can penetrate into the dyed veneer / technical veneer to wrap the wood fibers, block the aging damage of ultraviolet light to the wood fibers, and greatly improve the yellowing resistance of the dyed veneer / technical veneer.

[0030] (2) The coating process adopts water-based paint and UV paint roller coating process. Because there are fewer volatile substances, the damage to the environment and construction personnel is minimal.

[0031] (3) This application uses a roller coating method to apply the UV primer, which is convenient, simple and quick to apply, and has a short drying time, which can relieve the storage pressure of the factory.

[0032] (4) The color-fixing primer process of the present invention can ensure that the requirements for dyed veneer / technological veneer are relaxed during the process construction, reduce production costs, and ensure process stability.

[0033] (5) Compared with ordinary solid wood products, the coating process of the present invention has higher overall production efficiency and shorter construction cycle;

[0034] (6) The composite paint film obtained by the coating process of the present invention can solve the yellowing problem of dyed veneer / technical veneer, with high process stability and no color difference between different batches. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the coating process layer structure of the present invention;

[0036] In the diagram: 1-Stained veneer / technical veneer board, 2-Fixing primer, 3-Sealing primer, 4-UV primer, 5-Topcoat. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. However, the scope of protection of this invention is not limited to these embodiments. The same reference numerals throughout the text always represent the same elements, and similar reference numerals represent similar elements.

[0038] A color-fixing primer for stained veneer / technical veneer comprises 38-45 wt% water-based acrylic resin, 0.2-0.6 wt% water-based wetting agent, 0.05-0.25 wt% water-based defoamer, 40-50 wt% ethanol, 4-9 wt% ethylene glycol monobutyl ether, 1-5 wt% ultraviolet absorber, and 4-10 wt% deionized water.

[0039] The color-fixing primer comprises 40-42 wt% water-based acrylic resin, 0.3-0.5 wt% water-based wetting agent, 0.1-0.2 wt% water-based defoamer, 45-47 wt% ethanol, 5-8 wt% ethylene glycol monobutyl ether, 2-3 wt% ultraviolet light absorber, and 5-8 wt% deionized water.

[0040] The waterborne acrylic resin is a high-performance waterborne acrylic resin with high yellowing resistance, strong permeability, and fast drying.

[0041] The aqueous wetting agent is an alkylphenol polyoxyethylene ether polymer material.

[0042] The water-based defoamer is a modified polysiloxane.

[0043] The ultraviolet light absorber is at least one of Cytec's UV-531, BASF's T-292, T-400, and T-384-2.

[0044] The application of the color-fixing primer in the coating process of stained veneer / technical veneer.

[0045] A coating process for stained veneer / technical veneer includes the following steps:

[0046] (1) Sanding the surface and shaping of stained veneer / technical veneer;

[0047] (2) Spray / roll coat a color-fixing primer on the sanded board surface in step (1) and bake it;

[0048] (3) Spray / roll-coat water-based sealing primer on the surface where the color-fixing primer was sprayed in step (2);

[0049] (4) Apply UV putty to the surface of the water-based sealing primer applied in step (3);

[0050] (5) Apply primer to the surface treated in step (4);

[0051] (6) First roller coating of UV primer;

[0052] (7) Second roll coating of UV primer;

[0053] (8) Sanding the primer;

[0054] (9) Apply topcoat color correction to the sample blocks where the wood veneer color needs to be adjusted;

[0055] (10) Spray clear topcoat.

[0056] A composite paint film obtained by the above coating process.

[0057] The composite coating film comprises, from the inside out, a color-fixing primer, a sealing primer, a UV primer, and a topcoat.

[0058] The stained veneer used in the following examples and comparative examples is KOTO stained wood veneer, and the engineered veneer is Silver Pear 244Q engineered wood veneer, Silver Pear 691Q engineered wood veneer, Silver Pear 6331Q engineered wood veneer, and 18mm light pink engineered Silver Pear 6331Q solid wood veneer; the water-based acrylic resin in the color-fixing primer is 832G produced by Jili Chemical, the water-based wetting agent is BYK349 ​​produced by BYK Chemical, the water-based defoamer is modified polysiloxane, UV-531 is produced by Cytec Chemical, and T-292, T-400, and T-384-2 are produced by BASF; the water-based sealing primer used in the coating process is ZW40012, the UV putty is ZU62009, the UV primer is ZU45210, and the clear topcoat is ZW52247, all of which are produced by Zhancheng New Materials.

[0059] Example 1

[0060] A color-fixing primer for stained veneer / technical veneer comprises 40 wt% water-based acrylic resin, 0.5 wt% water-based wetting agent, 0.2 wt% water-based defoamer, 45 wt% ethanol, 5 wt% ethylene glycol monobutyl ether, 3 wt% ultraviolet light absorber (formulated by mixing UV-531 and T-292 in a 1:1 ratio), and 6.3 wt% deionized water.

[0061] A coating process for stained veneer includes the following steps:

[0062] (1) Sand the KOTO stained wood veneer with solid wood special 320# sandpaper for both flat and irregular sanding;

[0063] (2) Spray / roll coat the prepared color-fixing primer onto the treated board surface and bake it.

[0064] (3) Roller coat the surface that has been sprayed with color-fixing primer with water-based sealing primer;

[0065] (4) Apply UV putty to the surface of the above-mentioned water-based sealing primer by roller coating;

[0066] (5) Sand the primer surface after the above treatment with 320-400# sandpaper;

[0067] (6) First roller coating of UV primer;

[0068] (7) Second roll coating of UV primer;

[0069] (8) Sand the primer with 400-600# sandpaper;

[0070] (9) Apply topcoat color correction to the sample blocks that need to have their wood veneer color adjusted. The topcoat color correction is completed after 2 hours.

[0071] (10) Spray clear topcoat.

[0072] The composite paint film obtained by the above coating process includes a color-fixing primer, a sealing primer, a UV primer, and a topcoat, wherein the color-fixing primer is 35g / ㎡, the sealing primer is 35g / ㎡, the UV primer is 25g / ㎡, and the water-based topcoat is 100g / ㎡.

[0073] Example 2

[0074] A coating process for stained veneer is the same as in Example 1, except that both the color-fixing primer and the sealing primer are applied using a roller coating process.

[0075] Example 3

[0076] A coating process for engineered veneer includes the following steps:

[0077] (1) Sand the Silver Pear 244Q engineered wood veneer with solid wood special 320# sandpaper for both flat and irregular sanding;

[0078] (2) Roller coat the treated board surface with the color-fixing primer prepared in Example 1 and bake it;

[0079] (3) Spray a water-based sealing primer onto the surface that has been coated with the color-fixing primer;

[0080] (4) Apply UV putty to the surface of the above-mentioned water-based sealing primer by roller coating;

[0081] (5) Sand the primer surface after the above treatment with 320-400# sandpaper;

[0082] (6) First roller coating of UV primer;

[0083] (7) Second roll coating of UV primer;

[0084] (8) Sand the primer with 400-600# sandpaper;

[0085] (9) Apply topcoat color correction to the sample blocks that need to have their wood veneer color adjusted. The topcoat color correction is completed after 2 hours.

[0086] (10) Spray clear topcoat.

[0087] The composite paint film obtained by the above coating process includes a color-fixing primer, a sealing primer, a UV primer, and a topcoat, wherein the color-fixing primer is 35g / ㎡, the sealing primer is 35g / ㎡, the UV primer is 25g / ㎡, and the water-based topcoat is 100g / ㎡.

[0088] Example 4

[0089] The coating process for a type of engineered wood veneer is the same as in Example 3, except that the sample uses Silver Pear 691Q engineered wood veneer.

[0090] Example 5

[0091] The coating process for a type of engineered wood veneer is the same as in Example 3, except that the sample uses Silver Pear 6331Q engineered wood veneer.

[0092] Example 6

[0093] The coating process for a type of veneer is the same as in Example 3, except that the water-based sealing primer is applied using a roller coating process.

[0094] Example 7

[0095] The coating process for a type of engineered wood veneer is the same as in Example 3, except that the sample uses Silver Pear 691Q engineered wood veneer and the water-based sealing primer is applied using a roller coating process.

[0096] Example 8

[0097] The coating process for a type of engineered wood veneer is the same as in Example 3, except that the sample uses Silver Pear 6331Q engineered wood veneer and the water-based sealing primer is applied using a roller coating process.

[0098] Example 9

[0099] The coating process for a type of veneer wood is the same as in Example 6, except that the sample uses an 18mm light pink veneer of 6331Q solid wood, and the ultraviolet absorber is a mixture of UV-531 and T-384-2 in a mass ratio of 2:1.

[0100] Example 10

[0101] The coating process for a type of veneer wood is the same as in Example 6, except that the sample uses an 18mm light pink veneer of 6331Q solid wood, and the ultraviolet absorber is a mixture of UV-531 and T-400 in a mass ratio of 1:1.

[0102] Example 11

[0103] The coating process for a type of veneer wood is the same as in Example 6, except that the sample uses an 18mm light pink veneer of 6331Q solid wood, and the ultraviolet absorber is a mixture of UV-531 and T-292 in a mass ratio of 1:1.

[0104] Comparative Example 1

[0105] The stained veneer uses existing coating processes available on the market, as detailed in Table 1 below.

[0106] Comparative Example 2

[0107] The stained veneer uses existing coating processes available on the market, as shown in Table 1 below.

[0108] Comparative Example 3

[0109] The stained veneer uses existing coating processes available on the market, as detailed in Table 1 below.

[0110] Comparative Example 4

[0111] The engineered veneer uses existing coating processes available on the market, as detailed in Table 2 below.

[0112] Comparative Example 5

[0113] The engineered veneer uses existing spraying processes available on the market, as detailed in Table 2 below.

[0114] Comparative Example 6

[0115] The engineered veneer uses existing spraying processes available on the market, as detailed in Table 2 below.

[0116] Comparative Example 7

[0117] The engineered veneer uses existing spraying processes available on the market, as detailed in Table 2 below.

[0118] Comparative Example 8

[0119] The engineered veneer uses existing spraying processes available on the market, as detailed in Table 2 below.

[0120] Comparative Example 9

[0121] The engineered veneer uses existing spraying processes available on the market, as detailed in Table 2 below.

[0122] The composite coatings prepared in Examples 1-11 and Comparative Examples 1-9 were subjected to yellowing resistance tests. The standard requirement was that after 48 hours of UV irradiation, there should be no abnormalities such as bubbling or cracking, and the gray scale grade should be ≥4. The results are shown in Tables 1-4 below.

[0123] Table 1. Coating processes and yellowing resistance grades of Examples 1-2 and Comparative Examples 1-3

[0124]

[0125] Table 2. Coating processes and yellowing resistance grades of Examples 3-5 and Comparative Examples 4-6

[0126]

[0127] Table 3. Coating processes and yellowing resistance grades of Examples 6-8 and Comparative Examples 7-9

[0128]

[0129] Table 4. Coating process and yellowing resistance rating of Examples 9-11

[0130]

[0131] As shown in Table 1, the yellowing resistance level of dyed wood veneer using existing market coating processes is only 3-4 at most, while the yellowing resistance level of the same dyed wood veneer using the coating process proposed in this invention can reach 4-5. In Comparative Examples 1 and 1, as well as Comparative Examples 2 and 2, under the same coating conditions, whether spraying or roller coating, the yellowing resistance level is improved by using the color fixing process proposed in this invention.

[0132] As shown in Table 2, when using existing spraying processes on different engineered wood veneers, the yellowing resistance level is 3-4, with a maximum of 4. However, when using the color-fixing process of this invention, the yellowing resistance level is improved in all cases, and the yellowing resistance level can reach up to 5.

[0133] As shown in Table 3, when using the existing roller coating process on different engineered wood veneers, the yellowing resistance level is 3-4, with a maximum of 4. However, when using the color fixing process of this invention, the yellowing resistance level is improved in all cases, and the yellowing resistance level can reach up to 5.

[0134] As shown in Table 4, changing the brand of the UV absorber in the fixing agent and testing the effect of different brands on the process confirmed that different brands of UV absorbers have little effect on the yellowing resistance performance, and this effect cannot be reflected in the test results.

[0135] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A color-fixing primer for stained veneer / technological veneer, characterized in that, It comprises 38-45 wt% waterborne acrylic resin, 0.2-0.6 wt% waterborne wetting agent, 0.05-0.25 wt% waterborne defoamer, 40-50 wt% ethanol, 4-9 wt% ethylene glycol monobutyl ether, 1-5 wt% ultraviolet absorber, and 4-10 wt% deionized water; wherein the waterborne wetting agent is an alkylphenol polyoxyethylene ether polymer.

2. The color-fixing primer as described in claim 1, characterized in that, It includes 40-42 wt% waterborne acrylic resin, 0.3-0.5 wt% waterborne wetting agent, 0.1-0.2 wt% waterborne defoamer, 45-47 wt% ethanol, 5-8 wt% ethylene glycol monobutyl ether, 2-3 wt% ultraviolet absorber, and 5-8 wt% deionized water.

3. The color-fixing primer as described in claim 1, characterized in that, The water-based defoamer is a modified polysiloxane.

4. The color-fixing primer as described in claim 1, characterized in that, The ultraviolet light absorber is at least one of UV-531, T-292, T-400, and T-384-2.

5. The application of the color-fixing primer as described in any one of claims 1-4 in the coating process of stained veneer / technical veneer.

6. A coating process as described in claim 5, characterized in that, Includes the following steps: (1) Sanding the surface and shaping of stained veneer / technical veneer; (2) Spray / roll coat a color-fixing primer on the sanded board surface in step (1) and bake it; (3) Spray / roll-coat water-based sealing primer on the surface where the color-fixing primer was sprayed in step (2); (4) Apply UV putty to the surface of the water-based sealing primer applied in step (3); (5) Apply primer to the surface after the treatment in step (4); (6) Apply UV primer to the surface after sanding the primer in step (5) for the first time; (7) Apply a second UV primer to the UV primer surface in step (6); (8) Apply primer to the surface treated in step (7); (9) Apply topcoat color correction to the sample blocks where the wood veneer color needs to be adjusted; (10) Spray clear topcoat.

7. The coating process as described in claim 6, characterized in that, In step (2), the amount of the color-fixing primer applied is controlled at 30-100g / ㎡.

8. The coating process as described in claim 6, characterized in that, The first roll-coated UV primer in step (5) is semi-dry. After infrared leveling for 5-10 minutes, no sanding is required. The second roll-coated UV primer in step (6) is then applied directly. The second UV primer needs to be fully dry.

9. A composite paint film obtained by the coating process according to any one of claims 6-8, characterized in that, From the inside out, it includes a color-fixing primer, a sealing primer, a UV primer, and a topcoat.

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