EB curing ecological home cabinet door plate

Abstract

The present application relates to a kind of EB solidification ecological home cabinet door plate, including the structure of substrate layer, primer layer and topcoat, wherein topcoat is formed after using flame-retardant and reinforcing modifier compound coating by EB electron beam curing, and the composition of reinforcing modifier coating is nanometer silicon powder, alumina powder and boric acid or borax powder;Primer layer is made of water-based fluorinated polyurethane or acrylic emulsion;2-3 layers of primer are coated on substrate layer, and then external topcoat is coated, and after coating, it is cured by EB electron beam in nitrogen environment, to obtain EB solidification ecological home cabinet door plate, and the cabinet door plate produced has the excellent performance of low cost, stain resistance, wear resistance, corrosion resistance, high hardness, impact resistance, yellowing resistance and fingerprint resistance.

Description

Technical Field

[0001] This invention relates to the field of furniture, specifically to an EB-cured eco-friendly home cabinet door panel. Background Technology

[0002] Wood-based panels include natural wood panels and a wide range of wood-based engineered wood panels (plywood, particleboard, fiberboard, etc.), and are widely used in furniture, building materials, and other fields. In the production process of wood-based panels, wood panels that have not undergone the final finishing process are called raw panels. After the surface of raw panels is painted and cured, decorative coatings with colorful, diverse tones and patterns, as well as protective coatings with high surface performance and high adhesion can be formed.

[0003] However, the heat curing method consumes a large amount of heat or electricity during the curing process of liquid coatings, which is not an efficient use of energy. At the same time, the heat curing process uses coatings containing a large amount of solvents. When the solvents are heated and evaporate, the volatile organic compounds (VOCs) are released into the air, causing serious air pollution.

[0004] Ultraviolet (UV) curing is an alternative to thermosetting. It uses UV light to trigger a radiochemical reaction in the coating, generating reactive free radicals or ions that promote chain growth (polymerization / crosslinking, etc.), leading to rapid film formation and curing of the liquid coating. Because UV-cured coatings use little or no solvents, UV curing reduces VOC emissions and energy consumption during the curing process. However, due to the limitations of UV curing principles, UV light cannot penetrate the entire coating when curing thick, colored, metal-powder-containing, or inorganic-filler-containing coatings. This necessitates multiple UV curing steps, increasing production line complexity and space requirements, and reducing product quality controllability. Furthermore, the high temperature of the UV lamps and the infrared spectrum of their emission spectrum cause the irradiated object to heat up and deform, especially when processing large-area thin plates, leading to product deformation, quality issues, and production safety hazards. Additionally, the photoinitiators used in UV curing are expensive and may pose health risks.

[0005] Furthermore, thermosetting paints have a two-dimensional linear interlaced structure, while UV-curing materials mostly have a 2.5-dimensional dendritic cross-linked structure. Their curing degrees are around 60% and 40%-70%, respectively. Insufficient curing degree may affect the performance of subsequent related products. Summary of the Invention

[0006] The technical objective of this invention is to solve the problems in the background art and provide an EB-cured eco-friendly home cabinet door panel.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0008] An EB-cured eco-friendly home cabinet door panel is prepared by coating a multi-layer coating structure onto a substrate layer and then curing it with an EB electron beam.

[0009] The multilayer coating is applied to the substrate layer, and from the substrate layer outwards, there are several base coating layers, flame retardant layers, and outer top coating layers. The base coating layer is composed of water-based fluorinated polyurethane emulsion or acrylic emulsion. The top coating layer includes a flame retardant coating and an EB curing layer. The EB curing layer is composed of a coating compounded with reinforcing modifiers and cured by EB electron beam. The flame retardant in the flame retardant modified coating is prepared from melamine, rosin-based phosphazene crosslinked flame retardant, formaldehyde, and urea.

[0010] EB stands for Electron Beam, an abbreviation derived from the first letters of the English word "Electron Beam." Similar to how UV stands for Ultra-Violet, UV represents ultraviolet light, while EB represents an electron beam. Therefore, EB curing is essentially electron beam curing. In this process, under the electron beam environment, nitrogen molecules are in a plasma state. At high energy, this plasma nitrogen instantaneously reacts with nano-silicon, alumina, and Si, Al, and B from boric acid or borax in the surface modifier coating to generate silicon nitride (Si3N4), aluminum nitride (AlN), and boron nitride (BN). Silicon nitride, aluminum nitride, and boron nitride are all high-hardness ceramic materials that are stain-resistant, wear-resistant, and fingerprint-resistant. These nitrogen compounds, uniformly distributed on the outer layer of the coating, contribute to high surface performance and strong adhesion.

[0011] Preferably, the compound reinforcing modifier is composed of three modifying raw materials: nano-silica powder, alumina powder, and boric acid or borax powder. The preparation process of the reinforcing modifier coating is as follows: the nano-silica powder, alumina powder, and boric acid powder are added to a mixed solution of acrylate and waterborne polyurethane at 50-65℃ and stirred until the particulate matter in the solution is evenly dispersed to obtain the reinforcing modifier coating.

[0012] Preferably, the composite coating contains 1-5 parts by weight of reinforcing modifier nano-silica powder, 1-3 parts by weight of alumina powder, 1-5 parts by weight of boric acid or borax powder, and the remainder is acrylic emulsion or waterborne polyurethane emulsion of conventional coatings.

[0013] The advantages of this invention are that by mixing a small amount of nano-silicon powder, alumina and boric acid or borax powder into the emulsion coating, the anti-fouling, wear-resistant, impact-resistant and yellowing-resistant properties of the board surface can be greatly enhanced under electron beam irradiation. Furthermore, since the amount added is small and only needs to be stirred evenly after heating, the process is also low-cost and easy to operate.

[0014] Preferably, the preparation process of the flame-retardant modified coating is as follows: 30-70 parts, 15-25 parts, and 15-25 parts of melamine, formaldehyde, and urea are added to a reaction vessel to carry out a dimer reaction. After 60-90 minutes, 5-15 parts of rosin-based phosphazene crosslinking flame retardant are added as a primer and the reaction is continued for another 60-90 minutes to obtain a compound flame-retardant modified coating.

[0015] As a preferred option, the rosin-based phosphazene crosslinked flame retardant uses acyl-chlorinated rosin acid, acrylonitrile acid, and a phosphorus-containing diol. After esterification with triethanolamine as a catalyst, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time to generate the rosin-based phosphazene crosslinked flame retardant. The rosin acid comprises 25 parts, acrylonitrile acid comprises 35 parts, and the phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene each comprise 20 parts.

[0016] The advantage of this invention is that it further uses melamine, formaldehyde, and urea, and adds rosin-based phosphazene crosslinking flame retardant as a primer during their dimerization reaction, which can effectively generate organophosphorus grafted low-aldehyde environmentally friendly flame retardant. Its flame retardant, environmental protection, and safety properties are continuously improved during the organophosphorus grafting reaction due to the introduction of functional groups such as aldehyde groups.

[0017] Preferably, the waterborne fluorinated polyurethane emulsion in the base coating is prepared using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol, and guanidine-containing chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and left to stand for 2-3 hours. Then, diphenylmethane diisocyanate is placed in the above container and placed in a nitrogen environment at a temperature of 65-70°C. After stirring for 1-2 hours, the mixture is cooled to a temperature of 45-55°C. Then, DMG is added to the mixture and stirred for 30-45 minutes. Finally, deionized water is added and stirred for 10-20 minutes to obtain the waterborne fluorinated polyurethane emulsion.

[0018] Preferably, the poly(ethylene adipate) glycol has a molar mass fraction of 10-20 parts, the diphenylmethane diisocyanate has a mass fraction of 45-60 parts, the fluorinated polyether polyol has a mass fraction of 10-20 parts, the guanidine-containing chain extender DMG has a mass fraction of 5-15 parts, and the remainder is deionized water.

[0019] The advantages of using this invention are that waterborne fluorinated polyurethane containing DMG has good thermal and crystallization properties. In addition, adding it to the coating formulation greatly helps to improve the antibacterial and heat-resistant properties of the board surface.

[0020] Preferably, after the base coat has cured, it is sanded, followed by the application of the top coat. The base coat has an application rate of 30-50 g / m². 2The topcoat is applied by roller coating or curtain coating, with the coating amounts of the flame-retardant modified layer and the reinforcing modified EB curing layer being 10-20 g / m², respectively. 2 First, a flame-retardant modified layer is applied and pre-cured, then an enhanced modified EB curing layer is applied; after the topcoat coating is applied, the entire system is placed in an environment with more than 99.9% nitrogen (N2) for electron beam curing.

[0021] Preferably, the number of base coating layers is 2-3 layers, and each base coating layer is sanded once; the substrate board is one of impregnated paper-faced artificial board, polyester film-faced board, polyolefin film-faced board, HPL-faced board, artificial board board or inorganic fine sanded board.

[0022] The advantages of using this invention are that the EB-cured eco-friendly home cabinet door panels manufactured by this solution have excellent properties such as stain resistance, wear resistance, high hardness, impact resistance, yellowing resistance, fingerprint resistance, and green eco-friendliness.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. By adding nano-silicon powder, alumina, and boric acid or borax powder to the enhanced modified coating formula, under nitrogen atmosphere and irradiation by EB high-energy electron beam, nitrogen is in a plasma state and undergoes an electrochemical reaction with silicon, aluminum, and boron, generating a high-hardness ceramic material on the coating surface. This significantly improves the wear resistance, corrosion resistance, high hardness, stain resistance, impact resistance, yellowing resistance, and fingerprint resistance of furniture cabinet doors, while maintaining a green and ecological approach and being environmentally friendly. The addition of a specially formulated flame retardant makes the material difficult to burn, which is of great significance in the field of furniture cabinet doors.

[0025] 2. By adding a waterborne fluorinated polyurethane emulsion containing the chain extender DMG to the primer, the antibacterial and heat resistance of the board surface can be improved.

[0026] 3. The EB-cured eco-friendly home cabinet door panel prepared by the present invention is eco-friendly and pollution-free, and has low production cost and simple and convenient process, enabling large-scale production. Attached Figure Description

[0027] Figure 1 is a flowchart of the manufacturing process of an EB-cured eco-friendly home cabinet door panel. Detailed Implementation

[0028] The following specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention. Example 1

[0029] (1) Preparation of modifier coating: The modifier coating is composed of three modifying raw materials, namely nano-silicon powder, alumina powder and boric acid powder. The mass fraction of nano-silicon powder in the modifier coating is 1 part, the mass fraction of alumina powder is 1 part, the mass fraction of boric acid powder is 1 part, and the remainder is acrylic emulsion and waterborne polyurethane emulsion of conventional coatings. The preparation process of the modifier coating is as follows: After grinding the above-mentioned nano-silicon powder, alumina powder and boric acid powder into fine powder, the fine powder is added to a mixed solution of acrylic emulsion and waterborne polyurethane emulsion at 50℃ and stirred to make the particles in the solution evenly dispersed, thus obtaining the modifier coating.

[0030] (2) Preparation of compound flame retardant coating: The rosin-based phosphazene cross-linked flame retardant is prepared by esterification of acetic acid, acrylonitrile, and phosphorus-containing diol with triethanolamine as catalyst. After the esterification is completed, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time until the reaction is completed, thus generating the rosin-based phosphazene cross-linked flame retardant. Among them, 25 parts of rosin acid, 35 parts of acrylonitrile, 20 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene are used. Then, melamine, rosin-based phosphazene cross-linked flame retardant, urea and formaldehyde are used to prepare a phosphorus-containing flame retardant adhesive. The preparation process is to add 45 parts, 22.5 parts and 22.5 parts of melamine, formaldehyde and urea to the reaction vessel for dimer reaction. After reacting for 60 min, 10 parts of rosin-based phosphazene cross-linked flame retardant are added as a primer and the reaction is continued for 80 min to obtain the compound flame retardant.

[0031] (3) Preparation of the base coating: The waterborne fluorinated polyurethane emulsion in the base coating is prepared by using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol and guanidine chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and left for 2 hours. Then, diphenylmethane diisocyanate is placed in the above container and the container is in a nitrogen atmosphere at 65°C. After stirring for 1 hour, the temperature is cooled to 45°C. Then, DMG is added to the mixture and stirred for 30 minutes. Finally, deionized water is added and stirred for 10 minutes to obtain the waterborne fluorinated polyurethane emulsion. The molar mass fraction of polyethylene adipate is 10 parts, the mass fraction of diphenylmethane diisocyanate is 45 parts, the mass fraction of fluorinated polyether polyol is 10 parts, the mass fraction of guanidine chain extender DMG is 5 parts, and the remainder is deionized water.

[0032] (4) Cabinet door panel coating: Two layers of primer are applied to the substrate layer. Each layer of primer is cured and sanded after application. The coating amount of each primer layer is 30g / m². 2 Then, a topcoat is applied, with the flame-retardant layer and the EB-cured reinforcing modifier coating each having a coating amount of 10 g / m². 2 .

[0033] (5) EB electron beam curing: The board with the topcoat is irradiated and cured by electron beam in an atmosphere of more than 99.9% nitrogen to obtain an electron beam cured cabinet door panel. Example 2

[0034] (1) Preparation of modifier coating: The modifier coating is composed of three modifying raw materials, namely nano-silicon powder, alumina powder and borax powder. The mass fraction of nano-silicon powder in the modifier coating is 5 parts, the mass fraction of alumina powder is 3 parts, the mass fraction of boric acid powder is 5 parts, and the remainder is acrylic emulsion and water-based polyurethane emulsion of conventional coatings. The preparation process of the modifier coating is as follows: After grinding the above-mentioned nano-silicon powder, alumina powder and boric acid powder into fine powder, the fine powder is added to a mixed solution of acrylic emulsion and water-based polyurethane emulsion at 65℃ and stirred to make the particles in the solution evenly dispersed, thus obtaining the modifier coating.

[0035] (2) Preparation of compound flame retardant coating: The rosin-based phosphazene cross-linked flame retardant is prepared by esterification of acetic acid, acrylonitrile, and phosphorus-containing diol with triethanolamine as catalyst. After the esterification is completed, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time until the reaction is completed, thus generating the rosin-based phosphazene cross-linked flame retardant. Among them, 26 parts of rosin acid, 38 parts of acrylonitrile, 18 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene are used. Then, melamine, rosin-based phosphazene cross-linked flame retardant, urea and formaldehyde are used to prepare a phosphorus-containing flame retardant adhesive. The preparation process is to add 46 parts, 22 parts and 22 parts of melamine, formaldehyde and urea to the reaction vessel for dimer reaction. After reacting for 60 min, 10 parts of rosin-based phosphazene cross-linked flame retardant are added as a primer and the reaction is continued for 80 min to obtain the compound flame retardant.

[0036] (3) Preparation of the base coating: The waterborne fluorinated polyurethane emulsion in the base coating is prepared by using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol and guanidine chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and left for 3 hours. Then, diphenylmethane diisocyanate is placed in the above container and the container is in a nitrogen atmosphere at 70°C. After stirring for 2 hours, the temperature is cooled to 55°C. Then, DMG is added to the mixture and stirred for 45 minutes. Finally, deionized water is added and stirred for 20 minutes to obtain the waterborne fluorinated polyurethane emulsion. The molar mass fraction of polyethylene adipate is 20 parts, the mass fraction of diphenylmethane diisocyanate is 60 parts, the mass fraction of fluorinated polyether polyol is 10 parts, the mass fraction of guanidine chain extender DMG is 5 parts, and the remainder is deionized water.

[0037] (4) Cabinet door panel coating: Three layers of primer coating are applied to the substrate layer. Each layer of primer coating must be cured and sanded after application. The coating amount of each primer coating is 50g / m².2 Then, a topcoat is applied, with the flame-retardant layer and the EB-cured reinforcing modifier coating each having a coating amount of 20 g / m². 2 .

[0038] (5) EB electron beam curing: The board with the topcoat is irradiated and cured by electron beam in an atmosphere of more than 99.9% nitrogen to obtain an electron beam cured cabinet door panel. Example 3

[0039] (1) Preparation of modifier coating: The modifier coating is composed of three modifying raw materials, namely nano-silicon powder, alumina powder and boric acid powder. The mass fraction of nano-silicon powder in the modifier coating is 4 parts, the mass fraction of alumina powder is 2 parts, the mass fraction of boric acid powder is 3.5 parts, and the remainder is acrylic emulsion and waterborne polyurethane emulsion of conventional coatings. The preparation process of the modifier coating is as follows: after grinding the above-mentioned nano-silicon powder, alumina powder and boric acid powder into fine powder, the fine powder is added to a mixed solution of acrylic emulsion and waterborne polyurethane emulsion at 60℃ and stirred to make the particles in the solution evenly dispersed, thus obtaining the modifier coating.

[0040] (2) Preparation of compound flame retardant coating: The rosin-based phosphazene cross-linked flame retardant is prepared by esterification of acetic acid, acrylonitrile, and phosphorus-containing diol with triethanolamine as catalyst. After the esterification is completed, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time until the reaction is completed, thus generating the rosin-based phosphazene cross-linked flame retardant. Among them, 25 parts of rosin acid, 35 parts of acrylonitrile, 20 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene are used. Then, melamine, rosin-based phosphazene cross-linked flame retardant, urea and formaldehyde are used to prepare a phosphorus-containing flame retardant adhesive. The preparation process is to add 45 parts, 22.5 parts and 22.5 parts of melamine, formaldehyde and urea to the reaction vessel for dimer reaction. After reacting for 60 min, 10 parts of rosin-based phosphazene cross-linked flame retardant are added as a primer and the reaction is continued for 80 min to obtain the compound flame retardant.

[0041] (3) Preparation of the base coating: The waterborne fluorinated polyurethane emulsion in the base coating is prepared by using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol and guanidine chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and left for 2 hours. Then, diphenylmethane diisocyanate is placed in the above container and the container is in a nitrogen atmosphere at 67°C. After stirring for 2 hours, the temperature is cooled to 50°C. Then, DMG is added to the mixture and stirred for 40 minutes. Finally, deionized water is added and stirred for 15 minutes to obtain the waterborne fluorinated polyurethane emulsion. The molar mass fraction of polyethylene adipate is 10 parts, the mass fraction of diphenylmethane diisocyanate is 50 parts, the mass fraction of fluorinated polyether polyol is 20 parts, the mass fraction of guanidine chain extender DMG is 15 parts, and the remainder is deionized water.

[0042] (4) Cabinet door panel coating: Two layers of primer are applied to the substrate layer. Each layer of primer is cured and sanded after application. The coating amount of each primer layer is 35g / m². 2 Then, a topcoat is applied, with the flame-retardant layer and the EB-cured reinforcing modifier coating each having a coating amount of 15 g / m². 2 .

[0043] (5) EB electron beam curing: The board with the topcoat is irradiated and cured by electron beam in an atmosphere of more than 99.9% nitrogen to obtain an electron beam cured cabinet door panel. Example 4

[0044] (1) Preparation of modifier coating: The modifier coating is composed of three modifying raw materials, namely nano-silicon powder, alumina powder and boric acid powder. The mass fraction of nano-silicon powder in the modifier coating is 3.6 parts, the mass fraction of alumina powder is 1.8 parts, the mass fraction of boric acid powder is 3 parts, and the remainder is acrylic emulsion and waterborne polyurethane emulsion of conventional coatings. The preparation process of the modifier coating is as follows: after grinding the above-mentioned nano-silicon powder, alumina powder and boric acid powder into fine powder, the fine powder is added to a mixed solution of acrylic emulsion and waterborne polyurethane emulsion at 60℃ and stirred to make the particles in the solution evenly dispersed, thus obtaining the modifier coating.

[0045] (2) Preparation of compound flame retardant coating: The rosin-based phosphazene cross-linked flame retardant is prepared by esterification of acetic acid, acrylonitrile, and phosphorus-containing diol with triethanolamine as catalyst. After the esterification is completed, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time until the reaction is completed, thus generating the rosin-based phosphazene cross-linked flame retardant. Among them, 25 parts of rosin acid, 35 parts of acrylonitrile, 20 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene are used. Then, melamine, rosin-based phosphazene cross-linked flame retardant, urea and formaldehyde are used to prepare a phosphorus-containing flame retardant adhesive. The preparation process is to add 45 parts, 22.5 parts and 22.5 parts of melamine, formaldehyde and urea to the reaction vessel for dimer reaction. After reacting for 60 min, 10 parts of rosin-based phosphazene cross-linked flame retardant are added as a primer and the reaction is continued for 80 min to obtain the compound flame retardant.

[0046] (3) Preparation of the base coating: The waterborne fluorinated polyurethane emulsion in the base coating is prepared by using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol and guanidine chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and then placed for 2 hours. Then, diphenylmethane diisocyanate is placed in the above container and the container is in a nitrogen atmosphere at 70°C. After stirring for 1.5 hours, the mixture is cooled to 50°C. Then, DMG is added to the mixture and stirred for 40 minutes. Finally, deionized water is added and stirred for 15 minutes to obtain the waterborne fluorinated polyurethane emulsion. The molar mass fraction of polyethylene adipate is 18 parts, the mass fraction of diphenylmethane diisocyanate is 54 parts, the mass fraction of fluorinated polyether polyol is 13 parts, the mass fraction of guanidine chain extender DMG is 8 parts, and the remainder is deionized water.

[0047] (3) Cabinet door panel coating: Two layers of primer are applied to the substrate layer. Each layer of primer is cured and sanded after application. The coating amount of each primer layer is 42g / m². 2 Then, a topcoat is applied, with the flame-retardant layer and the EB-cured reinforcing modifier coating each having a coating amount of 15 g / m². 2 .

[0048] (5) EB electron beam curing: The board with the topcoat is irradiated and cured by electron beam in an atmosphere of more than 99.9% nitrogen to obtain an electron beam cured cabinet door panel. Example 5

[0049] (1) Preparation of modifier coating: The modifier coating is composed of three modifying raw materials, namely nano-silicon powder, alumina powder and boric acid powder. The mass fraction of nano-silicon powder in the modifier coating is 3.5 parts, the mass fraction of alumina powder is 1.3 parts, the mass fraction of boric acid powder is 2 parts, and the remainder is acrylic emulsion and water-based polyurethane emulsion of conventional coatings. The preparation process of the modifier coating is as follows: After grinding the above-mentioned nano-silicon powder, alumina powder and boric acid powder into fine powder, the fine powder is added to a mixed solution of acrylic emulsion and water-based polyurethane emulsion at 60℃ and stirred to make the particles in the solution evenly dispersed, thus obtaining the modifier coating.

[0050] (2) Preparation of compound flame retardant coating: The rosin-based phosphazene cross-linked flame retardant is prepared by esterification of acetic acid, acrylonitrile, and phosphorus-containing diol with triethanolamine as catalyst. After the esterification is completed, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time until the reaction is completed, thus generating the rosin-based phosphazene cross-linked flame retardant. Among them, 25 parts of rosin acid, 35 parts of acrylonitrile, 20 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene are used. Then, melamine, rosin-based phosphazene cross-linked flame retardant, urea and formaldehyde are used to prepare a phosphorus-containing flame retardant adhesive. The preparation process is to add 45 parts, 22.5 parts and 22.5 parts of melamine, formaldehyde and urea to the reaction vessel for dimer reaction. After reacting for 60 min, 10 parts of rosin-based phosphazene cross-linked flame retardant are added as a primer and the reaction is continued for 80 min to obtain the compound flame retardant.

[0051] (3) Preparation of the base coating: The waterborne fluorinated polyurethane emulsion in the base coating is prepared by using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol and guanidine chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and placed for 2.5 h. Then, diphenylmethane diisocyanate is placed in the above container and the container is in a nitrogen atmosphere at 65°C. After stirring for 1 h, the temperature is cooled to 45°C. Then, DMG is added to the mixture and stirred for 45 min. Finally, deionized water is added and stirred for 20 min to obtain the waterborne fluorinated polyurethane emulsion. The molar mass fraction of polyethylene adipate is 15 parts, the mass fraction of diphenylmethane diisocyanate is 50 parts, the mass fraction of fluorinated polyether polyol is 16 parts, the mass fraction of guanidine chain extender DMG is 9 parts, and the remainder is deionized water.

[0052] (4) Cabinet door panel coating: Two layers of primer are applied to the substrate layer. Each layer of primer is cured and sanded after application. The coating amount of each primer layer is 40g / m². 2 Then, a topcoat is applied, with the flame-retardant layer and the EB-cured reinforcing modifier coating each having a coating amount of 13 g / m². 2 .

[0053] (5) EB electron beam curing: The board with the topcoat is irradiated and cured by electron beam in an atmosphere of more than 99.9% nitrogen to obtain an electron beam cured cabinet door panel. Example 6

[0054] (1) Preparation of modifier coating: The modifier coating is composed of three modifying raw materials, namely nano-silicon powder, alumina powder and boric acid powder. The mass fraction of nano-silicon powder in the modifier coating is 4 parts, the mass fraction of alumina powder is 2 parts, the mass fraction of boric acid powder is 3.5 parts, and the remainder is acrylic emulsion and waterborne polyurethane emulsion of conventional coatings. The preparation process of the modifier coating is as follows: after grinding the above-mentioned nano-silicon powder, alumina powder and boric acid powder into fine powder, the fine powder is added to a mixed solution of acrylic emulsion and waterborne polyurethane emulsion at 60℃ and stirred to make the particles in the solution evenly dispersed, thus obtaining the modifier coating.

[0055] (2) Preparation of compound flame retardant coating: The rosin-based phosphazene cross-linked flame retardant is prepared by esterification of acetic acid, acrylonitrile, and phosphorus-containing diol with triethanolamine as catalyst. After the esterification is completed, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time until the reaction is completed, thus generating the rosin-based phosphazene cross-linked flame retardant. Among them, 25 parts of rosin acid, 35 parts of acrylonitrile, 20 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene are used. Then, melamine, rosin-based phosphazene cross-linked flame retardant, urea and formaldehyde are used to prepare a phosphorus-containing flame retardant adhesive. The preparation process is to add 45 parts, 22.5 parts and 22.5 parts of melamine, formaldehyde and urea to the reaction vessel for dimer reaction. After reacting for 60 min, 10 parts of rosin-based phosphazene cross-linked flame retardant are added as a primer and the reaction is continued for 80 min to obtain the compound flame retardant.

[0056] (3) Preparation of the base coating: The waterborne fluorinated polyurethane emulsion in the base coating is prepared by using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol and guanidine chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and left for 2 hours. Then, diphenylmethane diisocyanate is placed in the above container and the container is in a nitrogen atmosphere at 67°C. After stirring for 2 hours, the temperature is cooled to 50°C. Then, DMG is added to the mixture and stirred for 40 minutes. Finally, deionized water is added and stirred for 15 minutes to obtain the waterborne fluorinated polyurethane emulsion. The molar mass fraction of polyethylene adipate is 10 parts, the mass fraction of diphenylmethane diisocyanate is 50 parts, the mass fraction of fluorinated polyether polyol is 20 parts, the mass fraction of guanidine chain extender DMG is 15 parts, and the remainder is deionized water.

[0057] (4) Cabinet door panel coating: Two layers of primer are applied to the substrate layer. Each layer of primer is cured and sanded after application. The coating amount of each primer layer is 40g / m². 2 Then, a topcoat is applied, with the flame-retardant layer and the EB-cured reinforcing modifier coating each having a coating amount of 16 g / m². 2 .

[0058] (5) EB electron beam curing: The board with the topcoat is irradiated and cured by electron beam in an atmosphere of more than 99.9% nitrogen to obtain an electron beam cured cabinet door panel. Comparative Example 1

[0059] (1) Preparation of compound flame retardant coating: The rosin-based phosphazene cross-linked flame retardant is prepared by esterification of acetic acid, acrylonitrile, and phosphorus-containing diol with triethanolamine as catalyst. After the esterification is completed, an ethanol aqueous solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time until the reaction is completed, thus generating the rosin-based phosphazene cross-linked flame retardant. Among them, 25 parts of rosin acid, 35 parts of acrylonitrile, 20 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene are used. Then, melamine, rosin-based phosphazene cross-linked flame retardant, urea and formaldehyde are used to prepare a phosphorus-containing flame retardant adhesive. The preparation process is to add 45 parts, 22.5 parts and 22.5 parts of melamine, formaldehyde and urea to the reaction vessel for dimer reaction. After reacting for 60 min, 10 parts of rosin-based phosphazene cross-linked flame retardant are added as a primer and the reaction is continued for 80 min to obtain the compound flame retardant, which is the topcoat coating.

[0060] (2) Preparation of the base coating: The waterborne fluorinated polyurethane emulsion in the base coating is prepared by using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol and guanidine chain extender DMG. First, polyethylene adipate is dehydrated under vacuum at 120°C and then placed for 2 hours. Then, diphenylmethane diisocyanate is placed in the above container and the container is in a nitrogen atmosphere at 67°C. After stirring for 2 hours, the temperature is cooled to 50°C. Then, DMG is added to the mixture and stirred for 40 minutes. Finally, deionized water is added and stirred for 15 minutes to obtain the waterborne fluorinated polyurethane emulsion. The molar mass fraction of polyethylene adipate is 10 parts, the mass fraction of diphenylmethane diisocyanate is 50 parts, the mass fraction of fluorinated polyether polyol is 20 parts, the mass fraction of guanidine chain extender DMG is 15 parts, and the remainder is deionized water.

[0061] (3) Cabinet door panel coating: Two layers of primer are applied to the substrate layer. Each layer of primer is cured and sanded after application. The coating amount of each primer layer is 35g / m². 2 Then apply a flame-retardant coating at a rate of 15 g / m². 2 . Comparative Example 2

[0062] Standard cabinet door panels available on the market.

[0063] The plywood obtained in the above embodiments and comparative examples were subjected to hardness tests, abrasion resistance tests, yellowing resistance tests, and formaldehyde emission level assessments, respectively.

[0064] The method for testing the hardness of paint is as follows: Use a Mitsubishi test pencil with a specified 1H rating. Sharpen the pencil to about 3mm of cylindrical lead exposed (be careful not to damage the lead). Hold the pencil at a 90-degree angle to 400-grit sandpaper and continuously rub the lead end face in circles on the sandpaper until a smooth, sharp lead end is obtained. Mount the pencil on a dedicated pencil hardness tester, apply a load of 500gf to the pencil tip, and ensure the front end of the lead contacts the test surface at a 45° angle. Push the pencil forward at a speed of 0.5mm / s to 1mm / s for about 5m (if the sample length is less than 5m, test on the sample surface as much as possible), making 5 marks. After each mark, rotate the pencil about 60°. After the test, erase the black pencil marks on the paint coating surface with an eraser and compare with the test sample. The judgment criteria are: no indentations or scratches are allowed on the outer surface; indentations that can recover within 24 hours are not judged; minor scratches at the starting position (1 / 5 of the total length) are allowed.

[0065] The method for testing the abrasion resistance of coatings involves using a specialized abrasion tester and a specially manufactured paper tape. A load of 175g is applied, causing the paper tape to continuously rub against the sample surface a specified number of times. This test must be conducted in a room with 40%–60% humidity at room temperature. The paper tape is stored in an environment with 40% ± 5% humidity and 24℃ ± 2℃. Place the paper tape into the paper feed roller of the abrasion tester, ensuring it is not placed upside down. The paper tape is only used once on its inner surface; if not used for more than 4 hours, it must be stored in a drying oven. Mount and fix the sample, keeping it parallel to the horizontal plane. The tested area of ​​the sample must not be suspended; ensure the interior is filled with material. Adjust the balance bar so that the weight pressing on the oil coating surface is exactly 175g. Rub 200 times. The judgment criterion is that, when observed with a magnifying glass, the substrate is not exposed; otherwise, the coating passes.

[0066] The yellowing resistance test method involves irradiating the sample with ultraviolet light for 200 hours continuously. The judgment level is divided into 1-5 levels. Level 1 means that the material has almost no color change under the specified test conditions, maintaining its original color and exhibiting extremely high yellowing resistance. Level 2 means that the material has a slight color change during the test, but the change is minor and has little impact on the overall aesthetics. Level 3 means that the material has a relatively obvious color change under the test conditions, but still maintains a certain degree of aesthetics. Level 4 means that the material has a significant color change after the test, which has a significant impact on aesthetics, but it is still usable. Level 5 means that the material has a very serious color change after the test, which severely affects its aesthetics and usability, and it is almost unusable.

[0067] The formaldehyde emission level assessment method is E1, E0, E NF Level, of which E NF Grade 1 is the best, with a formaldehyde emission limit of ≤0.025.

[0068] In addition, the fingerprint resistance of the cabinet door panels was visually inspected by pressing a finger on the sample surface to ensure that the fingerprint was clearly visible. The fingerprints were carefully observed, and information such as the number, shape, and depth of the fingerprints was recorded. The number of fingerprints on the sample surface was scored, with a score range of 1-10. The higher the score, the worse the fingerprint resistance.

[0069] The test results are as follows:

[0070]

[0071] The data above shows that the best eco-friendly home cabinet door panel among the examples and comparative examples was obtained under the experimental conditions near Example 4, and the results of other examples were also good. Compared with the comparative example, it can be clearly seen that the modifier and compound flame retardant coating have a significant effect on improving the scratch resistance, fingerprint resistance, and yellowing resistance of the board. The addition of water-based fluorinated polyurethane coating in the base coating and the antibacterial design of the coating structure also make the various materials in this solution better combined.

Claims

1. An EB-cured eco-friendly home cabinet door panel, characterized in that, The EB-cured eco-friendly home cabinet door panel is prepared by coating a multi-layer coating structure onto a substrate layer and then curing it with an EB electron beam. The multilayer coating is applied to the substrate layer, with several base coatings, flame retardant layers and outer layer coatings distributed outwards from the substrate layer. The base coating is composed of a water-based fluorinated polyurethane emulsion. The outer layer coating comprises a flame retardant layer and an EB curing layer. The EB curing layer is composed of a coating compounded with reinforcing modifiers, cured by EB electron beam. The flame retardant in the flame retardant layer is prepared from melamine, rosin-based phosphazene crosslinked flame retardant, formaldehyde, and urea. The coating amounts of the flame retardant layer and the EB curing layer in the outer layer coating are 10-20 g / m², respectively. 2 After the outer layer coating is applied, the entire system is placed in an environment with more than 99.9% nitrogen (N2) for electron beam curing. The reinforcing modifier compound coating is composed of three modifying raw materials: nano-silica powder, alumina powder, and boric acid powder. The preparation process of the reinforcing modifier compound coating is as follows: the nano-silica powder, alumina powder, and boric acid powder are added to a mixed solution of acrylate and waterborne polyurethane at 50-65℃ and stirred until the particulate matter in the solution is evenly dispersed to obtain the reinforcing modifier compound coating. The reinforcing modifier compound coating contains 1-5 parts by mass of nano-silica powder, 1-3 parts by mass of alumina powder, 1-5 parts by mass of boric acid powder, and the remainder is a mixed solution of acrylate and waterborne polyurethane. The rosin-based phosphazene crosslinked flame retardant is prepared by esterification of acyl-chlorinated rosin acid, acrylonitrile acid, and phosphorus-containing diol with triethanolamine as a catalyst. After esterification, an aqueous ethanol solution is added and mixed evenly. Then, acetaminophen hexaaminocyclotriphosphazene is added and stirred for a period of time to generate the rosin-based phosphazene crosslinked flame retardant. The composition includes 25 parts of acyl-chlorinated rosin acid, 35 parts of acrylonitrile acid, and 20 parts each of phosphorus-containing diol and acetaminophen hexaaminocyclotriphosphazene. The waterborne fluorinated polyurethane emulsion in the base coating is prepared using polyethylene adipate, diphenylmethane diisocyanate, fluorinated polyether polyol, and guanidine-containing chain extender DMG. First, polyethylene adipate is vacuum dehydrated and left to stand for 2-3 hours. Then, diphenylmethane diisocyanate is placed in the above container and placed in a nitrogen atmosphere at a temperature of 65-70°C. After stirring for 1-2 hours, the mixture is cooled to 45-55°C. Then, DMG is added to the mixture and stirred for 30-45 minutes. Finally, deionized water is added and stirred for 10-20 minutes to obtain the waterborne fluorinated polyurethane emulsion.

2. The EB-cured eco-friendly home cabinet door panel according to claim 1, characterized in that: The preparation process of the compound flame retardant is as follows: 30-70 parts, 15-25 parts, and 15-25 parts of melamine, formaldehyde, and urea are added to a reaction vessel to carry out a dimer reaction. After 60-90 minutes, 5-15 parts of rosin-based phosphazene crosslinked flame retardant are added as a primer and the reaction is continued for another 60-90 minutes to obtain the compound flame retardant.

3. The EB-cured eco-friendly home cabinet door panel according to claim 2, characterized in that: The molar mass fraction of the poly(ethylene adipate) is 10-20 parts, the molar mass fraction of the diphenylmethane diisocyanate is 45-60 parts, the molar mass fraction of the fluorinated polyether polyol is 10-20 parts, the molar mass fraction of the guanidine-containing chain extender DMG is 5-15 parts, and the remainder is deionized water.

4. The EB-cured eco-friendly home cabinet door panel according to claim 1, characterized in that: After the base coat has cured, sanding is performed, followed by the application of the top coat. The base coat should be applied at a rate of 30-50 g / m². 2 The topcoat is applied by roller coating or curtain coating, with the flame retardant layer and EB curing layer each having a coating weight of 10-20 g / m². 2 First, a compound flame retardant is applied for pre-curing, and then an EB curing layer is applied. After the topcoat is applied, the entire system is placed in an environment with more than 99.9% nitrogen (N2) for electron beam curing.

5. The EB-cured eco-friendly home cabinet door panel according to claim 1, characterized in that: The base coating consists of 2-3 layers, and each layer of base coating is sanded once; the substrate board is one of the following: impregnated paper-faced artificial board, polyester film-faced board, polyolefin film-faced board, HPL-faced board, unfinished artificial board, or inorganic fine sanded board.

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