A uv roll-on penetrating primer, its preparation method and application

Abstract

The application discloses a UV roller coating penetrating primer and a preparation method and application thereof, and belongs to the technical field of paints. According to weight parts, the preparation raw material of the UV roller coating penetrating primer provided by the application comprises the following components: 20-25 parts of nine-functionality aromatic polyurethane acrylic resin; 8-12 parts of polyester acrylic resin; 4-5 parts of photoinitiator; 40-60 parts of bifunctionality monomer; 9-11 parts of lauryl acrylate; and 0.6-1.0 parts of auxiliary agent. The UV roller coating penetrating primer can effectively penetrate into the inside of a base material, and the UV roller coating penetrating primer penetrating into the inside of the base material can also be effectively cured. Meanwhile, the UV roller coating penetrating primer has excellent adhesion between a paint film formed by the UV roller coating penetrating primer and the base material and a topcoat (or putty). Therefore, a product prepared from the preparation raw material including the UV roller coating penetrating primer has excellent water boiling resistance and cold and hot cycle resistance. The application further provides a preparation method and application of the UV roller coating penetrating primer.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and specifically relates to a UV roller coating penetrating primer, its preparation method, and its application. Background Technology

[0002] Calcium silicate board is a modern building material made primarily of siliceous and calcareous materials as binders and fibers as reinforcements, produced through molding, pressing, and autoclaving. It combines the stability of inorganic materials with the toughness of organic fibers, and is therefore gradually replacing traditional gypsum board, mineral wool board, and other materials in many fields. Calcium silicate board is commonly used in exterior wall panels, indoor wall panels for humid and hot environments, and ceiling panels.

[0003] UV coatings, due to their extremely fast curing speed, can significantly improve production efficiency, making them particularly suitable for automated coating production lines. Therefore, calcium silicate boards are often coated and protected using UV coatings. However, calcium silicate UV-coated boards are frequently exposed to outdoor sun and rain, and are prone to blistering and peeling in high-temperature, high-humidity environments such as tunnels, bathrooms, and dams, or in water-soaked conditions. The density is 1~1.2 g / cm³. 3 Calcium silicate UV-coated boards made from calcium silicate boards still suffer from problems such as internal cracking of the substrate and detachment of the UV coating under external pulling forces. This is because the UV coating, especially the UV penetrating primer, forms a film that is too thin inside the calcium silicate board substrate, resulting in insufficient penetration depth, or even if the penetration depth is sufficient, the paint's overall polymerization initiation ability inside the substrate is weak. Currently used penetrating primers composed of low-functionality resins and di- and tri-functional monomers often encounter the above problems. For example: One technique employs a combination of polyurethane acrylic resin, bifunctional monomers, and a large number of trifunctional monomers to achieve good water resistance in the coating film, providing good interlayer adhesion between the substrate and the coating film, and increasing the polymerization rate. However, this results in high shrinkage and brittleness of the coating film, making it prone to cracking and peeling during thermal cycling tests. Furthermore, this technique is difficult to form a thick, penetrating coating, and under the harsh conditions of boiling water tests, the coating film may blister and peel off under the combined effects of high temperature and water vapor.

[0004] Another technical solution employs a specific ratio of alkyd resin prepolymer, epoxy acrylate, polyester acrylate, and multifunctional reactive monomers to achieve excellent permeability, good adhesion, and superior waterproofing. However, the alkyd resin prepolymer contains high levels of organic solvents, causing the penetrating primer to release VOCs during use, polluting the environment and harming workers' health. This technical solution's UV-curing components mainly consist of difunctional resins, difunctional monomers, and a large amount of trifunctional monomers. The paint film suffers from high shrinkage and brittleness, and is prone to cracking during thermal cycling tests. Furthermore, the paint solution that penetrates deep into the substrate is difficult to cross-link and cure into a film, resulting in a low penetration thickness. Therefore, although it exhibits good water resistance in test panels with a substrate-penetrating primer coating, if multiple UV coatings are applied over the penetrating primer using the UV coating process for calcium silicate boards, and a standard calcium silicate UV-coated board is used for water resistance tests, blistering and peeling will occur. The current technical challenge lies in the peeling of the top layer of paint during the water boiling test. In practical applications, the penetrating primer penetrates into the substrate and forms a unified whole with it. The substrate surface does not have a paint film of a certain thickness. If a layer of penetrating primer film of a certain thickness is applied to the substrate surface as a sealing primer film to observe and evaluate blistering and peeling, this deviates from the application scenario.

[0005] Another technology has broadly disclosed a surface penetration treatment method for wall decorative panels and its penetrant. The penetrant is prepared using acrylic prepolymer, acrylic monomer, photoinitiator, additives and fillers as raw materials. However, the broadly disclosed penetrant has very little reference value for the development of UV penetrating primers in this technical field.

[0006] In summary, while existing penetrating primers can improve the strength, water resistance, and interlayer adhesion of substrates such as calcium silicate UV-coated panels to some extent, they suffer from problems such as difficulty in efficiently penetrating deep into the substrate, difficulty in cross-linking and curing of the paint solution deep within the substrate, and relatively low thickness of the penetrating coating film inside the substrate. Therefore, there is an urgent need to provide a UV penetrating primer that can efficiently penetrate into the substrate and increase the thickness of the cured film inside the substrate, thereby enhancing the overall adhesion between the substrate and the paint film, its resistance to boiling water and thermal cycling, and making it suitable for automated coating production lines. Summary of the Invention

[0007] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a UV roller-coating penetrating primer that can effectively penetrate into the interior of a substrate, and the UV roller-coating penetrating primer that has penetrated into the substrate can also be effectively cured; moreover, the paint film formed by the UV roller-coating penetrating primer has excellent adhesion to the substrate and the topcoat (or putty); therefore, products prepared by including the UV roller-coating penetrating primer as raw material have excellent resistance to boiling water and resistance to thermal cycling.

[0008] The present invention also provides a method for preparing the above-mentioned UV roller-coated penetrating primer.

[0009] The present invention also provides the application of the above-mentioned UV roller-coated penetrating primer.

[0010] According to an embodiment of the first aspect of the present invention, a UV roller-coating penetrating primer is provided, wherein the raw materials for preparing the UV roller-coating penetrating primer include, by weight: 20-25 parts of a non-functional aromatic polyurethane acrylic resin; 8-12 parts of polyester acrylic resin; 4-5 parts of photoinitiator; 40-60 parts of bifunctional monomer; 9-11 parts lauryl acrylate; Additives: 0.6-1.0 parts.

[0011] The UV roller-coated penetrating primer according to embodiments of the present invention has at least the following beneficial effects: In the raw materials used in this invention, the nonafunctional aromatic polyurethane acrylic resin has good heat resistance and excellent UV curing rate, giving the UV roller coating penetrating primer an excellent crosslinking rate. Combined with an appropriate amount of photoinitiator, the UV roller coating penetrating primer that penetrates the substrate can rapidly polymerize and dry. The polyester acrylic resin has good flexibility, low shrinkage, and good adhesion. Furthermore, the polyester acrylic resin also has good substrate wetting properties; combined with appropriate additives (such as substrate wetting agents, dispersants, etc.), it can efficiently wet substrates such as calcium silicate boards and solid particles remaining in the substrate. Lauryl acrylate possesses excellent plasticizing and hydrophobic properties, along with a high initiation rate, which can improve water resistance, reduce initiation shrinkage, and decrease the brittleness of high-functionality resins. The difunctional monomer exhibits good dilution properties, ensuring that the viscosity of the UV roller-coating penetrating primer is at an ideal level. During the coating process, it can quickly penetrate into the substrate without the need for an infrared heating leveling machine. When added in a specific ratio, it reduces the viscosity of the resulting UV roller-coating penetrating primer while maintaining the cross-linking and curing ability of the paint film. It also neutralizes the brittleness of the nonfunctional aromatic polyurethane acrylic resin, ensuring that the cured paint film of the UV roller-coating penetrating primer does not crack or peel during thermal cycling.

[0012] Based on the superior properties of the raw materials mentioned above, the UV roller coating penetrating primer provided by this invention uses a non-functional aromatic polyurethane acrylic resin as the main resin, which has a synergistic effect with polyester acrylic and difunctional monomers. Combined with lauryl acrylate and a photoinitiator, the resulting UV roller coating penetrating primer film exhibits excellent adhesion and good water resistance. The specific dosage of the raw materials ensures that the UV roller coating penetrating primer of this invention has good fluidity, allowing it to penetrate deep into the substrate, and the cured film thickness inside the substrate is sufficiently thick. The cured film of the UV roller coating penetrating primer has excellent interlayer adhesion with UV topcoat (or putty), forming a solid whole between the substrate, primer, and topcoat (putty). Therefore, products containing the UV roller coating penetrating primer have excellent water resistance and resistance to thermal cycling. For example, when the substrate is a calcium silicate substrate, the resulting calcium silicate UV-coated board effectively prevents blistering and peeling of the paint film in a 100°C boiling water test for 8 hours.

[0013] The UV roller coating penetrating primer provided by this invention is suitable for roller coating and can effectively improve coating efficiency.

[0014] According to some embodiments of the present invention, the raw materials for preparing the UV roller-coated penetrating primer, by weight, include: 22-24 parts of a nine-functional aromatic polyurethane acrylic resin; 9-11 parts of polyester acrylic resin; 4.5-5 parts of photoinitiator; 46-56 parts of bifunctional monomers; 9.5 to 10.5 parts of lauryl acrylate; Additives: 0.7-0.9 parts.

[0015] According to some embodiments of the present invention, the materials for preparing the UV roller-coated penetrating primer, by weight, include: 23 parts of a nine-functional aromatic polyurethane acrylic resin; 10 parts of polyester acrylic resin; 4.5 parts of photoinitiator; 51.7 parts of bifunctional monomers; 10 parts lauryl acrylate; 0.8 parts of additives.

[0016] According to some embodiments of the present invention, preferably, the synthesis of the nine-functional aromatic polyurethane acrylic resin includes the following steps: D1. A trifunctional monomer containing a hydroxyl group reacts with TDI (2,4-diisocyanate-1-methylbenzene) to form a half-terminated adduct; D2. The adduct reacts with a triol.

[0017] D3. React the product obtained in step D2 with a trifunctional monomer containing hydroxyl groups.

[0018] According to some embodiments of the present invention, in step D1, the hydroxyl-containing trifunctional monomer includes pentaerythritol triacrylate.

[0019] According to some embodiments of the present invention, in step D1, the mass ratio of the hydroxyl-containing trifunctional monomer to the TDI is 1.5 to 2:1. For example, it can be 1.5:1, 1.7:1, 1.8:1, or 2:1.

[0020] According to some embodiments of the present invention, in step D1, the reaction is carried out with the assistance of a catalyst and a polymerization aid.

[0021] The catalyst includes an organobismuth catalyst; the mass ratio of the catalyst to the hydroxyl-containing trifunctional monomer is 1:2800~3200.

[0022] The polymerization aid includes hydroquinone; the mass ratio of the polymerization aid to the hydroxyl-containing trifunctional monomer is 1:500~700.

[0023] According to some embodiments of the present invention, in step D1, the temperature for mixing the raw materials is 35~45°C; after the feeding is completed, the temperature of the reaction is 80~90°C.

[0024] According to some embodiments of the present invention, in step D1, the reaction is terminated when half of the -NCO in the reaction system is consumed.

[0025] According to some embodiments of the present invention, in step D2, the triol comprises trimethylolpropane.

[0026] According to some embodiments of the present invention, in step D2, the mass ratio of the triol to the hydroxyl-containing trifunctional monomer in step D1 is 1:5 to 8. Specifically, it can be 1:5, 1:6, 1:7, 1:8; or a range of values ​​consisting of any two of the above points.

[0027] According to some embodiments of the present invention, in step D2, the temperature of the reaction is 88~92°C.

[0028] According to some embodiments of the present invention, in step D2, the reaction is terminated when the remaining amount of -NCO is 1%.

[0029] According to some embodiments of the present invention, in steps D3 and D1, the mass ratio of the hydroxyl-containing trifunctional monomer is 1:9~11.

[0030] In step D3, the purpose of the reaction is to remove residual isocyanate ions. The temperature control for the reaction in step D3 is the same as in step D2.

[0031] According to some embodiments of the present invention, preferably, the photoinitiator includes at least one of acylphosphide oxide and α-hydroxy ketone. During the curing process, the light entering the substrate has low intensity and long wavelength, so an appropriate amount of deep initiator with high photolysis efficiency, acylphosphide oxide, is required to enable the UV roller-coated primer penetrating the substrate to crosslink and cure into a film.

[0032] According to some embodiments of the present invention, the photoinitiator comprises acylphosphide oxide and α-hydroxy ketone.

[0033] According to some embodiments of the present invention, the acylphosphine oxide includes phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (abbreviated as 819).

[0034] According to some embodiments of the present invention, the α-hydroxy ketone includes at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone (CAS: 7473-98-5; abbreviated as 1173) and 1-hydroxycyclohexylphenyl ketone (abbreviated as 184).

[0035] According to some embodiments of the present invention, the photoinitiator comprises 819 and 1173. The mass ratio of 819 to 1173 is 1:1 to 2. Specifically, it can be 1:1, 1:1.2, 1:1.25, 1:1.5, 1:1.7, 1:2; or a range of values ​​consisting of any two of the above points.

[0036] According to some embodiments of the present invention, the bifunctional monomer includes at least one selected from 1,6-hexanediol diacrylate (HDODA), tripropylene glycol diacrylate (CAS No.: 42978-66-5; TPGDA), and dipropylene glycol diacrylate. 1,6-hexanediol diacrylate has excellent dilution properties, while tripropylene glycol diacrylate and dipropylene glycol diacrylate can improve the adhesion of the UV roller-coated penetrating primer.

[0037] According to some embodiments of the present invention, the bifunctional monomer comprises 1,6-hexanediol diacrylate and tripropylene glycol diacrylate. The mass ratio of 1,6-hexanediol diacrylate to tripropylene glycol diacrylate is 1.5 to 2:1. Specifically, it can be 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1; or a range of values ​​consisting of any two of the above points.

[0038] According to some embodiments of the present invention, the additives include at least one of dispersants, defoamers, substrate wetting agents, and leveling agents.

[0039] According to some embodiments of the present invention, the additives include dispersants, defoamers, and substrate wetting agents. The mass ratio of the dispersant, defoamer, and substrate wetting agent is 1.5~3:1:1.5~2.5; specifically, it can be 1.5:1:1.5, 1.5:1:2.5, 3:1:2, 2:1:2; or a range of values ​​consisting of any two of the above points.

[0040] The dispersant improves dispersion efficiency and also provides wetting. The substrate wetting agent provides wetting. The additives work synergistically to enhance the wetting and penetration effect of the UV roller-coated penetrating primer on the substrate.

[0041] According to an embodiment of a second aspect of the present invention, a method for preparing the UV roller-coated penetrating primer described in the first aspect of the present invention is provided, the method comprising mixing the raw materials for preparing the UV roller-coated penetrating primer.

[0042] S1. Mix the nonfunctional aromatic polyurethane acrylic resin, polyester acrylic resin, bifunctional monomer and lauryl acrylate; S2. Mix the mixture obtained in step S1 with the photoinitiator and the additives.

[0043] According to some embodiments of the present invention, in step S1, the mixing feeding sequence is as follows: adding the nonfunctional aromatic polyurethane acrylic resin, polyester acrylic resin, bifunctional monomer and lauryl acrylate.

[0044] According to some embodiments of the present invention, in step S1, the mixing equipment includes a dispersion tank. The equipment is not strictly limited here; in actual production, suitable equipment can be selected based on the reaction volume and available experimental conditions, as long as dispersion can be achieved.

[0045] According to some embodiments of the present invention, in step S1, the mixing method includes stirring. The stirring speed is 600-800 r / min; the stirring duration is 3-5 min. Specifically, the stirring speed can be 700 r / min; the stirring duration can be 4 min.

[0046] According to some embodiments of the present invention, in step S2, the mixing order is as follows: the additive and the photoinitiator are added to the mixture obtained in step S1 in sequence.

[0047] According to some embodiments of the present invention, in step S2, the mixing method includes stirring. The stirring speed is 1000-1200 r / min; the stirring duration is 10-15 min. Specifically, the stirring speed can be 1100 r / min; the stirring duration can be 12 min or 13 min.

[0048] According to an embodiment of the fourth aspect of the present invention, an application of the UV roller-coated penetrating primer described in the first aspect of the present invention in decoration is provided.

[0049] Since the application adopts all the technical solutions of the UV roller coating penetrating primer of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0050] According to some embodiments of the present invention, the decorative field includes wooden furniture decoration and decorative materials for building materials. More specifically, The decorative field includes the preparation of any one of calcium silicate UV-coated boards, gypsum UV-coated boards, and wood-based MDF.

[0051] According to some embodiments of the present invention, the calcium silicate UV-coated plate includes a calcium silicate substrate, a primer layer, and a surface coating; The raw materials for preparing the primer layer include the UV roller coating penetrating primer described in the first aspect embodiment of the present invention; The primer layer may partially or completely penetrate into the interior of the calcium silicate substrate; The surface coating is applied to the side of the primer layer away from the calcium silicate substrate.

[0052] Due to the excellent performance of the UV roller-coated penetrating primer, the calcium silicate UV-coated board solves the problems of poor overall adhesion, easy blistering and peeling caused by the poor bonding strength of the UV roller-coated penetrating primer inside the calcium silicate substrate, thus improving the yield of calcium silicate UV-coated boards.

[0053] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Detailed Implementation

[0054] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by the present invention.

[0055] Unless otherwise specified, the raw materials, reagents, or apparatus used in the following examples are all available from conventional commercial sources or can be obtained by existing known methods. Specifically, the sources of the raw materials used in the examples and comparative examples are as follows: The polyester acrylic resin is 2202 from Zhongshan Ketian Electronic Materials Co., Ltd.

[0056] The bifunctional monomer was provided by Jiangsu Sanmu Chemical Co., Ltd.

[0057] Lauryl acrylate was supplied by Zhongshan Yuanda New Materials Co., Ltd.

[0058] The dispersant was Evcona's AFCONA-4053.

[0059] The defoamer is an organic polymer solution, TEGO® Airex 923.

[0060] The substrate wetting agent is Tigo Wet 270.

[0061] The photoinitiator was provided by Tianjin Jiuri New Materials Co., Ltd.

[0062] The organic bismuth catalyst is BCAT-E20 from Guangzhou Yourun Synthetic Materials Co., Ltd.

[0063] The nine-functional aromatic polyurethane acrylic resin includes the following steps: 300 kg of pentaerythritol triacrylate, 0.1 kg of organic bismuth catalyst, and 0.5 kg of hydroquinone co-polymerizer were sequentially added to a reactor. The temperature was raised to 40°C, and 176 kg of 2,4-diisocyanate-1-methylbenzene was slowly added. After stirring evenly, the temperature was raised to 85°C. When the -NCO value was reduced by half, 44.7 kg of trimethylolpropane was slowly added, and the temperature was raised to 90°C. When the -NCO value was 1%, 30 kg of pentaerythritol triacrylate was added, and the temperature was maintained to continue the reaction. When the -NCO value was zero, the product was discharged to obtain a nonafunctional aromatic polyurethane acrylic resin.

[0064] Example 1 This example demonstrates the preparation of a UV roller-coated penetrating primer. The specific raw material composition, by weight, is as follows: 20 parts of a nine-functional aromatic polyurethane acrylic resin; 8 parts of polyester acrylic resin; 1.5 parts of 819 photoinitiator; 2.5 parts of 1173 photoinitiator; 15 parts of tripropylene glycol diacrylate; 25 parts of 1,6-hexanediol diacrylate; 9 parts lauryl acrylate; 0.3 parts dispersant; 0.1 parts of defoamer; 0.2 parts of substrate wetting agent; In this example, the preparation method of the UV roller-coated penetrating primer is as follows: S1. Add the nonfunctional aromatic polyurethane acrylic resin, polyester acrylic resin, difunctional monomer and lauryl acrylate into a container (e.g., a dispersion tank) in sequence, adjust the speed of the disperser to 700 r / min, and stir for 4 min to make the resin and monomer mix evenly. S2. Add the additives and photoinitiator to the mixture obtained in step S1 in sequence, adjust the rotation speed to 1100 r / min, and disperse for 13 min to obtain the UV roller coating penetrating primer.

[0065] Example 2 This example demonstrates the preparation of a UV roller-coated penetrating primer. The specific raw material composition, by weight, is as follows: 23 parts of a nine-functional aromatic polyurethane acrylic resin; 10 parts of polyester acrylic resin; 2 parts of 819 photoinitiator; 2.5 parts of 1173 photoinitiator; 20 parts of tripropylene glycol diacrylate; 31.7 parts of 1,6-hexanediol diacrylate; 10 parts lauryl acrylate; 0.3 parts dispersant; 0.2 parts of defoamer; 0.3 parts of substrate wetting agent.

[0066] The preparation method is the same as in Example 1.

[0067] Example 3 This example demonstrates the preparation of a UV roller-coated penetrating primer. The specific raw material composition, by weight, is as follows: 25 parts of a nine-functional aromatic polyurethane acrylic resin; 12 parts of polyester acrylic resin; 2.5 parts of 819 photoinitiator; 2.5 parts of 1173 photoinitiator; 22 parts of tripropylene glycol diacrylate; 38 parts of 1,6-hexanediol diacrylate; 11 parts lauryl acrylate; 0.3 parts dispersant; 0.2 parts of defoamer; 0.5 parts of substrate wetting agent.

[0068] The preparation method is the same as in Example 1.

[0069] Comparative Example 1 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: In this example, the nine-functional aromatic polyurethane acrylic resin is 12 parts by weight.

[0070] Comparative Example 2 This example prepares a UV roller-coated penetrating primer, which differs from Example 3 in that: This example contains 35 parts of a nine-functional aromatic polyurethane acrylic resin.

[0071] Comparative Example 3 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: In this example, the amount of polyester acrylic resin is 3 parts.

[0072] Comparative Example 4 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: In this example, the amount of polyester acrylic resin is 18 parts.

[0073] Comparative Example 5 This example prepares a UV roller-coated penetrating primer, which differs from Example 2 in that: In this example, 1.5 parts of 819 photoinitiator and 2 parts of 1173 photoinitiator are used.

[0074] Comparative Example 6 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: In this example, there are 5 parts of tripropylene glycol diacrylate.

[0075] Comparative Example 7 This example prepares a UV roller-coated penetrating primer, which differs from Example 3 in that: In this example, 48 parts of 1,6-hexanediol diacrylate were used.

[0076] Comparative Example 8 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: No lauryl acrylate was added in this example.

[0077] Comparative Example 9 This example prepares a UV roller-coated penetrating primer, which differs from Example 3 in that: In this example, lauryl acrylate is 18 parts.

[0078] Comparative Example 10 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: No dispersant or substrate wetting agent is added in this example.

[0079] Comparative Example 11 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: Replace the 819 photoinitiator with the TPO initiator.

[0080] Comparative Example 12 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: Replace 15 parts of tripropylene glycol diacrylate and 25 parts of 1,6-hexanediol diacrylate with 40 parts of isobornyl acrylate.

[0081] Comparative Example 13 This example prepares a UV roller-coated penetrating primer, which differs from Example 1 in that: Polyester acrylate has been replaced with bisphenol A epoxy acrylate. The bisphenol A epoxy acrylate is 6105-80 from Jiangsu Sanmu Group Co., Ltd.

[0082] For ease of comparison, the parameters of the raw materials used in the examples and some comparative examples are listed in Table 1. In Table 1, the nine-functional aromatic polyurethane acrylic resin is referred to as polyurethane acrylic resin.

[0083] Table 1. Composition (parts by weight) of raw materials used in the examples and some comparative examples.

[0084] Test case This example uses the UV roller-coating penetrating primers prepared in Examples 1-3 and Comparative Examples 1-10 as raw materials to prepare calcium silicate UV-coated panels, and characterizes their properties, wherein: Overall adhesion (a comprehensive reflection of the adhesion between the UV roller-coated penetrating primer and the calcium silicate substrate, and the interlayer adhesion between the UV roller-coated penetrating primer and the top putty): This is achieved using a roller coater at a density of 1.0~1.2 g / cm³. 3 A calcium silicate substrate (with a limited density, a test board with comparable performance can be obtained; materials from different manufacturers have comparable performance) is coated with a 35~45 g / m² coating. 2 The UV roller-coated penetrating primer is then cured in a curing machine with a single lamp and a mercury lamp, followed by a roller-coated layer of 20~45g / m². 2 A conventional UV roller-coated transparent putty with a powder content of 30% (such as UVN2235 from Beixin Carpoly) was cured with a mercury lamp to prepare a test panel. Then, a cross-cut test (cross-cut spacing 2mm) was performed on the test panel in accordance with GB / T9286-2021.

[0085] Water boiling resistance test: A roller coater was used on materials with a density of 1.0~1.2 g / cm³.3 35~45g / m² of calcium silicate substrate was roll-coated onto the substrate. 2 The UV roller-coated penetrating primer is then cured in a curing machine with a single lamp and a mercury lamp, followed by a roller-coated layer of 20~45g / m². 2 A standard UV roller-coated transparent putty with a powder content of 30% (such as Beixin Carpoly's UVN2235) is applied and cured with a mercury lamp, then sanded smooth, followed by two coats of 20~25g / m². 2 A standard UV roller-coated white primer with a titanium dioxide content of 35% or higher (such as Beixin Carpoly's UVS223) is applied, followed by a final roller-coated layer of 4~8 g / m². 2 A UV roller-coated matte clear topcoat (such as Beixin Carpoly's UVM2831) is applied and cured to create a calcium silicate UV-coated test panel. Three 20cm x 30cm calcium silicate UV-coated test panels are placed in a boiling water bath. Deionized water is added to the bath until the water level is at least 5cm above the test panels. The water is heated until boiling. After boiling for 8 hours, the test panels are removed and observed for blistering or peeling. If two or three panels show no abnormalities, record "no abnormalities"; if two or three panels show blistering, record "blistering"; if two or three panels show peeling, record "peeling".

[0086] Thermal cycling test: A roller coater was used at a density of 1.0~1.2 g / cm³. 3 35~45g / m² of calcium silicate substrate was roll-coated onto the substrate. 2 The UV roller-coated penetrating primer is then cured in a curing machine with one mercury lamp and one mortar lamp, followed by a roller coating of 35~45g / m². 2 A UV roller-coated penetrating primer was applied and then cured using a curing machine with one kerosene lamp and one mercury lamp to create test panels. The crack resistance and peeling resistance of the UV roller-coated penetrating primer were indirectly evaluated by the short-term temperature change resistance of the thick paint film. Three 20cm×30cm test panels were placed in a programmable temperature and humidity test chamber and subjected to a thermal cycling test according to GB / T 4893.7-2013; the first stage was a high temperature of (60±2)℃ and a relative humidity of (95±3)%, for 1 hour; the second stage was a low temperature of (-20℃±2)℃ for 1 hour. After 10 cycles, the cracking, peeling, and other defects in the paint film were described.

[0087] The performance test results of the test panels made from UV roller-coated penetrating primers prepared in the examples and comparative examples are shown in Table 2.

[0088] Table 2 Performance of UV roller-coated penetrating primers obtained in the examples and comparative examples Experimental Project Overall adhesion Boiling water resistance test Thermal cycling test Example 1 Level 0 No abnormalities No abnormalities Example 2 Level 0 No abnormalities No abnormalities Example 3 Level 0 No abnormalities No abnormalities Comparative Example 1 Level 0 foaming No abnormalities Comparative Example 2 Level 2 Bubbling, peeling cracking Comparative Example 3 Level 0 foaming cracking Comparative Example 4 Level 1 foaming No abnormalities Comparative Example 5 Level 1 Bubbling, peeling No abnormalities Comparative Example 6 Level 2 foaming cracking Comparative Example 7 Level 0 Bubbling, peeling No abnormalities Comparative Example 8 Level 1 foaming cracking Comparative Example 9 Level 2 Bubbling, peeling No abnormalities Comparative Example 10 Level 0 foaming No abnormalities Comparative Example 11 Level 0 Bubbling, peeling No abnormalities Comparative Example 12 1 foaming No abnormalities Comparative Example 13 2 foaming No abnormalities As shown in Table 1, the adhesion of the paint film in Examples 1-3 was all grade 0, and there were no abnormalities in the 8-hour boiling water test and the hot and cold cycling test.

[0089] Comparisons of Comparative Examples 1-9 and Examples 1 and 3 show that when the weight ratio of nonfunctional aromatic polyurethane acrylic resin: polyester acrylic resin: photoinitiator: bifunctional monomer: lauryl acrylate is outside the ratio of (20-25): (8-12): (4-5): (40-60): (9-11), it will lead to a decrease in the performance of the coating film or even serious performance problems.

[0090] Comparison between Comparative Example 10 and Example 1 shows that the lack of dispersant and substrate wetting agent results in insufficient wetting of the UV roller-coated penetrating primer, leading to pinholes in the paint film. It also affects the wetting and penetration of the UV roller-coated penetrating primer into the calcium silicate substrate, resulting in insufficient paint film thickness penetrating into the substrate, and consequently, blistering in the boiling water resistance test.

[0091] As can be seen from the comparison between Comparative Example 11 and Example 1, the 819 initiator has excellent photolytic activity in deep initiation, which can efficiently initiate the crosslinking of UV roller coating penetrating primer to form a film, and thus exhibits superior performance.

[0092] Comparing Example 1 and Comparative Examples 12-13, it can be seen that there is a synergistic effect between the nine-functional aromatic polyurethane acrylic resin, polyester acrylic resin and the bifunctional monomer; the overall performance of the obtained UV roller coating penetrating primer can only be optimized within the range of reagent types required by the present invention. If a certain reagent is replaced, the overall performance of the UV roller coating penetrating primer will decrease.

[0093] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A UV roller-coated penetrating primer, characterized in that, The raw materials for preparing the UV roller-coated penetrating primer, by weight, include: 20-25 parts of a non-functional aromatic polyurethane acrylic resin; 8-12 parts of polyester acrylic resin; 4-5 parts of photoinitiator; 40-60 parts of bifunctional monomer; 9-11 parts lauryl acrylate; Additives: 0.6-1.0 parts.

2. The UV roller-coated penetrating primer according to claim 1, characterized in that, The raw materials for preparing the UV roller-coated penetrating primer, by weight, include: 22-24 parts of a nine-functional aromatic polyurethane acrylic resin; 9-11 parts of polyester acrylic resin; 4.5-5 parts of photoinitiator; 46-56 parts of bifunctional monomers; 9.5 to 10.5 parts of lauryl acrylate; Additives: 0.7-0.9 parts.

3. The UV roller-coated penetrating primer according to claim 1, characterized in that, The photoinitiator includes acylphosphide oxide and α-hydroxy ketone.

4. The UV roller-coated penetrating primer according to claim 1, characterized in that, The bifunctional monomer includes at least one of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, and dipropylene glycol diacrylate.

5. The UV roller-coated penetrating primer according to claim 1 or 4, characterized in that, The bifunctional monomers include 1,6-hexanediol diacrylate and tripropylene glycol diacrylate.

6. The UV roller-coated penetrating primer according to claim 1, characterized in that, The additives include at least one of dispersants, defoamers, substrate wetting agents, and leveling agents.

7. The UV roller-coated penetrating primer according to claim 1 or 6, characterized in that, The additives include dispersants, defoamers, and substrate wetting agents.

8. A method for preparing a UV roller-coated penetrating primer as described in any one of claims 1 to 7, characterized in that, The preparation method includes mixing the raw materials for preparing the UV roller coating penetrating primer.

9. The preparation method according to claim 8, characterized in that, The preparation method includes the following steps: S1. Mix the nonfunctional aromatic polyurethane acrylic resin, polyester acrylic resin, bifunctional monomer and lauryl acrylate; S2. Mix the mixture obtained in step S1 with the photoinitiator and the additives.

10. The application of a UV roller-coated penetrating primer as described in any one of claims 1 to 7 in the decorative field.

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