UV-cured high-adhesive-force primer composition for melamine plate and application of UV-cured high-adhesive-force primer composition

Abstract

The invention discloses a UV-cured high-adhesion primer composition for a melamine plate and application of the UV-cured high-adhesion primer composition. The UV-cured high-adhesion primer composition for the melamine plate is prepared from the following components in parts by mass: 25 to 40 parts of pure acrylic ester, 3 to 5 parts of phosphate modified acrylic resin, 25 to 35 parts of flexible polyurethane acrylate, 3 to 5 parts of organic silicon modified polyurethane resin, 3 to 10 parts of an acrylate group-containing monomer and 1 to 5 parts of a photoinitiator. Through formula adjustment and fine design of a coating process, the problem of poor adhesive force of a melamine plate is effectively solved, the characteristics of rapid curing and low energy consumption of the melamine plate provide an efficient and reliable coating solution for the fields of furniture manufacturing, decoration engineering and the like, and the melamine plate has a wide application prospect.

Description

Technical Field

[0001] This application relates to the field of UV-curable coating technology, and more particularly to a UV-curable high-adhesion primer composition for melamine boards and its application. Background Technology

[0002] Melamine sheets are widely used in cabinets, office furniture, and interior decoration due to their excellent wear resistance, heat resistance, and diverse decorative properties. However, their smooth surface and low polarity make it difficult for traditional coatings to adhere effectively during the coating process, often resulting in defects such as paint film peeling, cracking, or blistering, which seriously affect the product's service life and appearance quality.

[0003] In existing UV primer formulations, the interfacial bonding between the resin and the substrate is generally insufficient, resulting in poor coating durability and difficulty in meeting the requirements of high-load operating environments. In addition, the low curing efficiency and high energy consumption of traditional coating processes also restrict the advancement of large-scale industrial production.

[0004] Therefore, developing a primer that can improve adhesion while achieving sand-free, efficient, and low-energy coating production is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, this application provides an optimized UV primer formulation and matching coating solution, which improves adhesion while achieving sand-free, high-efficiency, and low-energy coating production through material compounding and process innovation.

[0006] This application provides a UV-curable high-adhesion primer composition for melamine boards, comprising, by weight, 25 to 40 parts of pure acrylate, 3 to 5 parts of phosphate-modified acrylic resin, 25 to 35 parts of flexible polyurethane acrylate, 3 to 5 parts of silicone-modified polyurethane resin, 3 to 10 parts of acrylate-based monomers, and 1 to 5 parts of photoinitiator.

[0007] In some specific implementations, the acrylate-containing monomers include 1,6-hexanediol diacrylate and / or tripropylene glycol diacrylate.

[0008] In some specific implementations, the acrylate-containing monomers are 1,6-hexanediol diacrylate and tripropylene glycol diacrylate, and the mass ratio of 1,6-hexanediol diacrylate to tripropylene glycol diacrylate is (1-3):2.

[0009] In some specific implementations, the photoinitiator includes one or more of trimethylbenzoyl-diphenylphosphine oxide, methyl benzoylformate, or benzophenone.

[0010] In some specific implementations, the phosphate-modified acrylic resin includes HC5110 and / or HC5351.

[0011] In some specific implementations, the flexible polyurethane acrylate includes CR90475 and / or HP6206.

[0012] In some specific implementations, the pure acrylate includes HA507-1 and / or HA505.

[0013] In some specific implementations, the UV-curable high-adhesion primer for melamine boards further includes 0.3 to 2 parts by weight of additives, including leveling agents and defoamers.

[0014] In some specific implementations, the leveling agent includes one or more of BYK 3770, BYK 358N, or TEGO 3770; the defoamer includes TEGO 920 and / or BYK 055.

[0015] This application also provides a painting method, including:

[0016] A UV-curable high-adhesion primer composition for melamine boards is obtained by mixing pure acrylate, phosphate-modified acrylic resin, flexible polyurethane acrylate, silicone-modified polyurethane resin, acrylate-containing monomers and photoinitiator.

[0017] A UV-curable high-adhesion primer composition for melamine boards is applied to a melamine decorative panel and then cured.

[0018] In some specific implementations, the coating includes roller coating, the thickness of the wet film after coating is 10 μm to 15 μm, and the thickness of the cured film is 40 μm to 50 μm.

[0019] This application effectively solves the problem of poor adhesion of melamine boards through formula adjustment and refined coating process design. Its rapid curing and low energy consumption characteristics provide an efficient and reliable coating solution for furniture manufacturing, decoration engineering and other fields, and have broad application prospects. With the continuous advancement of UV curing technology and increasingly stringent environmental protection requirements, the solution described in this application is expected to be promoted in more substrates and application scenarios, providing strong support for the technological upgrading and sustainable development of the surface coating industry. Detailed Implementation

[0020] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.

[0021] The terms “including,” “having,” or “containing,” including the use of their grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.

[0022] It should be understood that the order of steps or the sequence of actions is not important as long as this application remains operational. Furthermore, two or more steps or actions can be performed simultaneously.

[0023] The use of any and all instances or exemplary language such as “e.g.” or “include” in this document is intended merely to better illustrate the application and does not constitute a limitation on the scope of the application. No language in this specification should be construed as indicating that any unclaimed element is essential to the practice of this application.

[0024] Furthermore, the numerical ranges and parameters used to define this application are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any numerical value inevitably contains standard deviations due to individual test methods. Therefore, unless otherwise explicitly stated, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately." Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.

[0025] This application provides a UV-curable high-adhesion primer composition for melamine boards, comprising, by weight, 25 to 40 parts pure acrylate, 3 to 5 parts phosphate-modified acrylic resin, 25 to 35 parts flexible polyurethane acrylate, 3 to 5 parts silicone-modified polyurethane resin, 3 to 10 parts acrylate-based monomers, and 1 to 5 parts photoinitiator.

[0026] This application solves the problem of insufficient adhesion caused by the smooth surface and low polarity of melamine substrate by optimizing the resin system and coating process, and is applicable to furniture manufacturing, interior decoration and other fields.

[0027] The UV-curable high-adhesion primer composition for melamine sheets comprises pure acrylate. In some specific implementations, the pure acrylate includes, but is not limited to, HA507-1. The pure acrylate is present in parts by weight of 25 to 40 parts, specifically 25, 30, or 36 parts. The pure acrylate provides flexibility, enhancing wettability and anchoring properties to the melamine surface.

[0028] The UV-curable high-adhesion primer composition for melamine sheets includes a phosphate-modified acrylic resin. In some specific implementations, the phosphate-modified acrylic resin includes, but is not limited to, HC5110. The phosphate-modified acrylic resin is present in parts by weight of 3 to 5 parts, specifically 3 parts or 5 parts. The phosphate-modified acrylic resin enhances adhesion to the melamine sheet.

[0029] The UV-curable high-adhesion primer composition for melamine sheets comprises a flexible polyurethane acrylate. In some specific implementations, the flexible polyurethane acrylate includes, but is not limited to, CR90475. The flexible polyurethane acrylate is present in parts by weight of 25 to 35 parts, specifically 25, 30, or 35 parts.

[0030] The UV-curable high-adhesion primer composition for melamine sheets comprises a silicone-modified polyurethane resin. In some specific implementations, the silicone-modified polyurethane resin comprises a silicone acrylic resin, and the silicone-modified polyurethane resin is present in parts by weight of 3 to 5 parts, or up to 4 parts. The silicone-modified polyurethane resin enhances the wettability to the melamine surface.

[0031] The UV-curable high-adhesion primer composition for melamine boards comprises acrylate-based monomers. In some specific implementations, the acrylate-based monomers include 1,6-hexanediol diacrylate and / or tripropylene glycol diacrylate. In some specific implementations, the acrylate-based monomers are 1,6-hexanediol diacrylate (HDDA) and tripropylene glycol diacrylate (TPGDA), and the mass ratio of 1,6-hexanediol diacrylate to tripropylene glycol diacrylate is (1-3):2, which can be 1:2, 1.2:2, 1.4:2, 1.5:2, 1.7:2, 1.9:2, 2:2, 2.2:2, 2.5:2, 2.8:2, or 3:2. The mass fraction of the acrylate-based monomers is from 3 to 10 parts, which can be 3, 4, 5, 6, 7, 8, 9, or 10 parts. 1,6-Hexanediol diacrylate exhibits high reactivity, promoting increased crosslinking density and thus enhancing film hardness and abrasion resistance. Tripropylene glycol diacrylate possesses excellent leveling and compatibility, effectively reducing system viscosity and facilitating application.

[0032] The UV-curable high-adhesion primer composition for melamine boards includes a photoinitiator. In some specific implementations, the photoinitiator includes one or more of trimethylbenzoyl-diphenylphosphine oxide (TPO), methyl benzoylformate (MBF), or xylene ketone (BP). In some specific implementations, the photoinitiator comprises a trimethylbenzoyl-diphenylphosphine oxide to methyl benzoylformate mass ratio of 3:2. The photoinitiator is a TPO and MBF compound system, which generates free radicals under ultraviolet light irradiation, initiating a polymerization reaction, ensuring deep curing of the coating, avoiding unreacted monomer residue, and improving the density and durability of the paint film.

[0033] In some specific implementations, the UV-curable high-adhesion primer for melamine boards further includes 0.3 to 2 parts by weight of additives, including leveling agents and defoamers.

[0034] In some specific implementations, the leveling agent includes a fluorinated leveling agent and / or a siloxane leveling agent, wherein the fluorinated leveling agent includes BYK 3770, and the siloxane leveling agent includes BYK 358N; the defoamer includes TEGO 920 and / or BYK 055. The leveling agent includes one or more of BYK 3770, BYK 358N, or TEGO 3770.

[0035] The advantages of the UV-cured high-adhesion primer composition for melamine boards are: no sanding required: breaking the industry convention that melamine boards must be sanded, protecting the integrity and aesthetics of the decorative layer; efficient and continuous production: the primer dries quickly (<2s), and the production line speed is >15 m / min; environmental friendliness: 100% solids content system, zero VOC emissions.

[0036] This application also provides a painting method, including:

[0037] A UV-curable high-adhesion primer composition for melamine boards is obtained by mixing pure acrylate, phosphate-modified acrylic resin, flexible polyurethane acrylate, silicone-modified polyurethane resin, acrylate-containing monomers and photoinitiator.

[0038] A UV-curable high-adhesion primer composition for melamine boards is applied to a melamine decorative panel and then cured.

[0039] In some specific implementations, the coating includes roller coating, the wet film thickness after coating is 10 μm to 15 μm, and the cured film thickness is 40 μm to 50 μm. In some specific implementations, the curing is carried out under mercury lamp irradiation at 120 W / cm, peak wavelength 365 nm, and irradiance 200 mJ / cm. In some specific implementations, the coating includes roller coating with an interval of <5 min.

[0040] The present application is further illustrated below with reference to embodiments. The scope of protection of the present application is not limited to the following embodiments.

[0041] Examples 1-5

[0042] Examples 1-5 provide UV-curable high-adhesion primers for melamine boards, and the components are shown in Table 1.

[0043] Preparation methods include:

[0044] The above components are mixed to obtain a UV-curable high-adhesion primer for melamine boards.

[0045] The method for applying a UV-cured high-adhesion primer to melamine sheets includes:

[0046] 1. Substrate treatment: Surface treatment of melamine panels involves wiping with isopropyl alcohol to remove surface oil stains, eliminating the need for sanding;

[0047] 2. Coating: Apply the adhesion primer using a UV roller coater, with a coating amount of 13-17 grams per square meter.

[0048] 3. Curing: Mercury lamp (120 W / cm, peak wavelength 365 nm), irradiation dose 200 mJ / cm;

[0049] 4. Topcoat application: Apply UV topcoat directly by roller (interval < 5 min), and the amount of coating after curing is 30-40 grams.

[0050] Comparative Example 1

[0051] This comparative example provides a UV-curable high-adhesion primer for melamine boards, differing from Example 1 only in that it does not contain phosphate ester resin. The components are shown in Table 1.

[0052] Comparative Example 2

[0053] This comparative example provides a UV-curable high-adhesion primer for melamine boards, differing from Example 1 only in that it does not contain silicone acrylic resin. The components are shown in Table 1.

[0054] Table 1

[0055]

[0056] The performance of the UV-cured high-adhesion primers for melamine boards provided in Examples 1-4 and Comparative Examples 1 and 2 was tested using the following methods:

[0057] Initial adhesion (cross-cut test): GB / T 9286-2021

[0058] Thermal cycling: GB 4893.7-85

[0059] Topcoat gloss: GB / T 4893.6-2013

[0060] The test results are shown in Table 2.

[0061] Table 2

[0062]

[0063] Primer without added phosphate ester resin: Cross-cut adhesion grade 3; formulation without added silicone resin and fluorine-containing additives showed obvious poor wetting.

[0064] Comparative Examples 1 and 2 serve as comparative examples of Example 4, respectively without the addition of phosphate ester resin and silicone resin. As can be seen from Table 2, the adhesion of both examples decreased to varying degrees compared to Example 4, and the adhesion deteriorated after a thermal cycling test.

[0065] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

Claims

1. A UV-curable high-adhesion primer composition for melamine boards, characterized in that, The product comprises, by weight, 25 to 40 parts pure acrylate, 3 to 5 parts phosphate-modified acrylic resin, 25 to 35 parts flexible polyurethane acrylate, 3 to 5 parts silicone-modified polyurethane resin, 3 to 10 parts acrylate-containing monomers, and 1 to 5 parts photoinitiator.

2. The UV-curable high-adhesion primer composition for melamine boards according to claim 1, characterized in that, The acrylate-containing monomers include 1,6-hexanediol diacrylate and / or tripropylene glycol diacrylate.

3. The UV-curable high-adhesion primer composition for melamine boards according to claim 1, characterized in that, The acrylate-containing monomers are 1,6-hexanediol diacrylate and tripropylene glycol diacrylate, and the mass ratio of 1,6-hexanediol diacrylate to tripropylene glycol diacrylate is (1-3):

2.

4. The UV-curable high-adhesion primer composition for melamine boards according to claim 1, characterized in that, The photoinitiator includes one or more of trimethylbenzoyl-diphenylphosphine oxide, methyl benzoate, or benzophenone.

5. The UV-curable high-adhesion primer composition for melamine boards according to claim 1, characterized in that, The phosphate-modified acrylic resin includes HC5110 and / or HC5351.

6. The UV-curable high-adhesion primer composition for melamine boards according to claim 1, characterized in that, The flexible polyurethane acrylate includes CR90475 and / or HP6206, and the pure acrylate includes HA507-1 and / or HA505.

7. The UV-curable high-adhesion primer composition for melamine boards according to claim 1, characterized in that, The UV-curable high-adhesion primer for melamine boards further includes 0.3 to 2 parts by weight of additives, including leveling agents and defoamers.

8. The UV-curable high-adhesion primer composition for melamine sheets according to claim 7, characterized in that, The leveling agent includes one or more of BYK 3770, BYK 358N or TEGO 3770; the defoamer includes TEGO 920 and / or BYK 055.

9. A coating method, characterized in that, include: A UV-curable high-adhesion primer composition for melamine boards is obtained by mixing pure acrylate, phosphate-modified acrylic resin, flexible polyurethane acrylate, silicone-modified polyurethane resin, acrylate-containing monomers and photoinitiator. A UV-curable high-adhesion primer composition for melamine boards is applied to a melamine decorative panel and then cured.

10. The coating method according to claim 9, characterized in that, The coating includes roller coating, the thickness of the wet film after coating is 10 μm to 15 μm, and the thickness of the cured film is 40 μm to 50 μm.

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