Wood veneer open-texture intelligent biomimetic solid wood straight grain pattern water-based paint panel finishing process

Abstract

This application relates to the field of surface finishing technology for water-based paint panels used in home furnishing manufacturing, and particularly to a surface finishing process for a smart bionic solid wood straight-grain water-based paint panel with open-grain wood veneer. The surface finishing process includes the following steps: S1 stage: open-grain wood veneer shaping; S2 stage: smart bionic solid wood straight-grain UV primer composite coating, which includes five coating steps; S3 stage: water-based paint topcoat composite coating. This application provides a surface finishing process for a smart bionic solid wood straight-grain water-based paint panel with open-grain wood veneer to solve the problems of cumbersome steps and low production efficiency in existing coating processes.

Description

Technical Field

[0001] This application relates to the field of surface finishing technology for water-based paint panels for home furnishing, and in particular to a surface finishing process for a wood veneer open-texture intelligent bionic solid wood straight-grain water-based paint panel. Background Technology

[0002] Chinese invention patent application number CN202510349499.5 discloses a three-stage digital coating process for odor-free, aging-resistant, and crack-resistant solid wood water-based paint boards. The process includes three stages: stage S1 includes five types of primers, involving five coating layers and four processes; stage S2 includes two types of primers and four types of inks, involving three coating layers and three processes; and stage S3 includes one UV primer, one UV-3D textured topcoat, one water-based UV color-correcting primer, and one water-based topcoat, involving four coating layers and four processes.

[0003] Although the aforementioned patented technical solutions address many pain points of existing open-texture mountain-pattern lacquer panels (such as poor odor neutralization, indistinct wood-textured and solid-wood feel, weak naturalness, lack of high-end finish, and weak surface aging and crack resistance), and offer excellent cost-effectiveness, the aforementioned patented inventions and their technical solutions present the following problems in the production of open-texture straight-grain lacquer panels, requiring urgent special research and solutions:

[0004] (1) The coating structure is complex; a total of 8 coatings are used, including 5 types of UV primer, 1 type of water-based UV primer, 1 type of UV topcoat, and 1 type of water-based topcoat, as well as 4 types of UV ink, with a total of 12 coatings. The production process and production cycle are too long and the production efficiency is relatively low.

[0005] (2) The coating process of the paint coating is relatively complex; there are a total of 11 coating processes, which require a large number of production equipment and occupy a large area of ​​production space, resulting in a relatively high investment in the production line.

[0006] (3) The total coating amount is relatively large, and the overall composite coating thickness is relatively large, resulting in higher material costs; especially for products with straight open texture, the cost is high and the cost-effectiveness is low.

[0007] (4) The surface decoration colors and surface textures are too obviously copied and replicated. The similarity and repetition between products are very obvious. The decoration is relatively monotonous, rigid and dull, lacking the liveliness and dynamic changes that are naturally present in real natural wood veneer. There is still a lot of room for improvement in the authenticity and naturalness of the surface decoration effect of the products.

[0008] (5) The total production cost is relatively high, and there is still a huge room and potential for improvement in cost-effectiveness;

[0009] (6) The surface has relatively weak high durability performance, such as high scratch resistance, high stain resistance, and high resistance to thermal cycling, making it difficult to meet the high requirements of special application scenarios with harsh environmental conditions. Summary of the Invention

[0010] This application provides a finishing process for a wood veneer open-texture intelligent biomimetic solid wood straight-grain pattern water-based paint board to solve the problems mentioned in the background art.

[0011] Firstly, a surface treatment process for a wood veneer open-texture intelligent biomimetic solid wood straight-grain pattern water-based paint board is provided, which includes the following steps:

[0012] S1 Section: Straight Grain Wood Veneer Open Texture Shaping: Ordinary hardwood with medium to coarse pore structure, diffuse-porous or semi-ring-porous wood is selected, and straight grain is cut to obtain hard open-grain wood veneer formaldehyde-free artificial board as the base material. After the surface of the wood veneer layer of the base material is enhanced with solid wood texture and standardized shaping processing by using a solid wood board antique relief wire drawing machine, the surface of the base material is sanded and dusted.

[0013] S2 Section: Intelligent biomimetic solid wood straight grain pattern UV base coating composite coating:

[0014] S201 process: Application of the first UV base coat: On the surface of the substrate with open texture of straight wood veneer in the S1 process, apply an odor-free, yellowing-resistant water-based UV transparent color-correcting base coat by roller and complete UV curing.

[0015] S202 process: Coating of the second UV primer layer: On the first UV primer layer, roll-coat an odor-free, yellowing-resistant UV transparent adhesive primer, and complete UV curing and surface polishing and cleaning;

[0016] S203 process: Coating of the third UV primer layer: On the second UV primer layer, 3D digitally print 4~8 color odorless and yellowing resistant UV solid color intelligent bionic solid wood straight grain pattern ink image coating, and complete UV curing.

[0017] S204 Process: Coating of the fourth UV primer layer: On top of the third UV primer layer, roll-coat a clean, yellowing-resistant UV transparent hardening primer and complete UV curing.

[0018] S205 process: Coating of the fifth UV primer layer: On the fourth UV primer layer, roll-coat a clean, yellowing-resistant UV transparent matte primer and complete UV curing.

[0019] S3 Section: Water-based Topcoat Composite Coating: After polishing and cleaning the surface of the fifth UV primer coating, a multi-functional water-based topcoat is sprayed by an intelligent spraying robot. The finishing process is completed after heating and humidifying for leveling, heating and dehumidifying for drying, and air cooling to remove odors.

[0020] Preferably, in the S1 section, the density of the substrate is 0.5~0.8 g / cm³. 3 The moisture content is 6~12%, and the processing type is straight-grained sliced ​​multi-slice glued integrated whole sheet veneer. The width of a single veneer unit is 100~250mm, and the thickness of the veneer is 0.35~0.50mm.

[0021] Preferably, in step S3, the multifunctional water-based topcoat comprises, by weight, 100 parts main agent, 5-15 parts curing agent, 0.2-2 parts anti-aging additive, 3-6 parts VOCs purifier, 2-4 parts anti-fingerprint additive, 2-4 parts scratch-resistant additive, and 1-5 parts other additives.

[0022] The main component comprises a waterborne aliphatic and polyester polyurethane resins in a mass ratio of 3:1:1, an organic fluorine and organic silicon modified waterborne acrylate and polyurethane resins, and a thermosetting conversion elastic base material composition emulsion of a waterborne polyurethane-acrylate hybrid aqueous dispersion.

[0023] The other additives include defoamers, leveling agents, wetting agents, and viscosity modifiers.

[0024] Preferably, in the aqueous aliphatic and polyester polyurethane resins, the aqueous aliphatic polyurethane resin is isophorone diisocyanate, and the aqueous polyester polyurethane resin is nonionic aqueous polyester polyurethane, wherein the aqueous aliphatic and polyester polyurethane resins are a combination of the two in equal proportions.

[0025] Preferably, the organofluorine and organosilicon modified waterborne acrylate and polyurethane resin is a mixture of organofluorine and organosilicon modified waterborne acrylate and organofluorine and organosilicon modified polyurethane resin in equal proportions.

[0026] Based on mass parts, the organofluorine and organosilicon modified waterborne acrylate comprises 20 parts of fluorosilicone composite monomer, 20 parts of methyl methacrylate, 15 parts of butyl acrylate, 1 part of initiator, 3 parts of emulsifier, 2 parts of aziridine crosslinking agent, 0.5 parts of hindered phenolic antioxidant 1010, 0.5 parts of organosilicon leveling agent, and 100 parts of deionized water. The fluorosilicone composite monomer is a mixture of dodecafluoroheptyl methacrylate and γ-methacryloyloxypropyltrimethoxysilane in equal proportions.

[0027] According to the mass fraction, the organofluorine and organosilicon modified polyurethane resin comprises 40 parts of polyol composite system, 20 parts of isophorone diisocyanate, 10 parts of fluorosilicone modifier, 5 parts of chain extender, 12 parts of N,N-dimethylformamide, 5 parts of acetone, 1 part of phosphite antioxidant and 1 part of light stabilizer.

[0028] The polyol composite system comprises polytetrahydrofuran diol, polyethylene adipate diol, and perfluoropolyether polyol in a mass ratio of 5:2:1.

[0029] The fluorosilicone modifier is an aminopropyl polydimethylsiloxane and perfluorooctyltrimethoxysilane in a mass ratio of 1:1.

[0030] Preferably, the thermosetting conversion elastic matrix composition emulsion of the waterborne polyurethane-acrylate hybrid aqueous dispersion comprises, by weight, 20 parts waterborne polyurethane prepolymer, 15 parts methyl acrylate, 0.1 parts ammonium persulfate initiator, 1 part sodium dodecyl sulfate, 1 part aziridine, 2 parts dimethylolpropionic acid, 0.2 parts additives, and 20 parts deionized water.

[0031] Preferably, the curing agent is a composition of equal proportions of hydrophilic and oleophobic modified aliphatic polyisocyanate, epoxy resin having alcohol hydroxyl groups, and hydrophilic and oleophobic modified alicyclic polyisocyanate.

[0032] The anti-aging additives are a mixture of 2-hydroxy-4-methoxybenzophenone, 4-hydroxy-2,2,6,6-tetramethylpiperidine, hexyl diethylaminohydroxybenzoylbenzoate, ethylhexyl methoxycinnamate, and rutile gas-phase nano-titanium dioxide and nano-zinc dioxide in equal proportions.

[0033] The VOCs purifying agent is a composition of gas-phase nano-photocatalyst, chitosan, and ethylene urea in equal proportions;

[0034] The anti-fingerprint additive is a composition of equal proportions of thioctic acid and organosilicon-modified polyacrylate solution with functional hydroxyl groups.

[0035] The scratch-resistant additive is a composition of equal proportions of fumed nano-alumina and fumed nano-silica dispersion.

[0036] Preferably, the processing speed of the S1 section is 6~12m / min;

[0037] The processing speed of the S2 section is 16~18m / min;

[0038] The processing speed of the S3 section is 5~6 m / min.

[0039] Preferably, in step S201, the coating amount is 50~80 g / m². 2 ;

[0040] In the S202, the coating amount is 10~20g / m². 2 ;

[0041] In step S203, the coating amount of each color ink is 1~6 g / m². 2 ;

[0042] In the S204, the coating amount is 15~25g / m². 2 ;

[0043] In the S205, the coating amount is 15~25g / m². 2 ;

[0044] In step S3, the coating amount of the multifunctional water-based topcoat is 60~100g / m². 2 After coating is completed, the surface is first humidified and heated for 5 minutes at 30-40℃ for far-infrared light wave leveling and heating treatment, and then dried for 5 minutes at 35-45℃ in a heated and dehumidified dry heat environment. Next, it is dried for 90-120 minutes at 50-60℃ in a heated and dehumidified dry heat environment for odor removal treatment. Finally, the coating is cooled and deodorized by cold air until the surface temperature reaches below 40℃ and there are no residual odor-causing substances on the surface. Then, it is stacked and naturally stored for curing. The process is completed after curing for 24 hours.

[0045] The beneficial effects of the technical solution provided in this application include:

[0046] (1) The number of painting sections and processes has been reduced, and production efficiency has increased by about 36%; the two sections of primer and intermediate coating have been optimized and merged into one composite primer section, which has reduced multiple intermediate process links, greatly shortened the actual labor and working time of the production process, and significantly improved the overall production efficiency.

[0047] (2) The number of UV coating varieties in the existing technical solution is reduced from 8 to 5, making material management simpler, more efficient and less prone to errors;

[0048] (3) The number of coatings in the existing technical solution is reduced from 12 to 6, and the coating structure is simplified. The paint feel is appropriately weakened, while the wood feel is significantly strengthened and enhanced, achieving the perfect combination of "straight grain open texture wood veneer + water paint" with the ultimate and just right effect of "seeing the wood but not the paint, not overshadowing the main body, and "the wood feel as the main body and the paint feel as the auxiliary body".

[0049] (4) The total coating amount of the overall composite coating in the existing technical solution is reduced from 381~625 g / m². 2 Reduce to 150~240 g / m 2In particular, it directly saves on the cost of the more expensive UV-3D textured topcoat (coating weight is 150~250 g / m²). 2 This allows the total cost of paint consumed per square meter of product area to be reduced by more than 60%;

[0050] (5) The structure of the existing water-based paint topcoat composite coating has been optimized, simplifying it from 4 coatings to only 1 multi-functional water-based topcoat coating, saving the application of 3 functional UV primer coatings. The performance and function of the water-based topcoat have been improved and upgraded, so that the performance of the finish is optimized while saving the process.

[0051] (6) Significantly enhances the realism and extreme simulation of the imitation of precious and superior straight-grain open-textured wood veneer + water-based paint finish, effectively solving the problems of dullness, repetition, lack of natural variation, and lack of life and biomass variation texture in digital coating replicas and reproductions.

[0052] (7) In addition to the properties of being odor-free, resistant to yellowing and cracking, it also has the properties of being highly resistant to stains and scratches, integrating more durable properties into one, making it more cost-effective. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 The production process of the open-grain wood veneer intelligent biomimetic solid wood straight-grain pattern water-based paint board provided in this application is as follows:

[0055] Figure 2 The production process of the S2 section of the intelligent bionic solid wood straight grain pattern UV base coating composite coating for the surface treatment of the wood veneer open texture intelligent bionic solid wood straight grain pattern water paint board provided in this application.

[0056] Figure 3 The production process of water-based paint coating composite coating in section S3 of the surface treatment of the wood veneer open texture intelligent bionic solid wood straight grain pattern water-based paint board provided in this application. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] See Figures 1-3 As shown, this application provides a finishing process for a wood veneer open-texture intelligent biomimetic solid wood straight-grain pattern water-based paint board.

[0059] Example 1

[0060] In this embodiment, the finishing process of the wood veneer open-grain intelligent bionic solid wood straight-grain water-based paint board (the solid wood texture and intelligent bionic straight-grain pattern are: 0.5mm thick AAA grade straight-grain North American black walnut, the finishing process is double-sided straight-grain open-grain wood veneer + matte water-based paint finish, the specifications are 2745*1220*18mm, the formaldehyde emission level is formaldehyde-free, and the base material is wood veneer plywood) includes the following steps:

[0061] Section S1 (processing speed is 10m / min): Straight-grain wood veneer open texture shaping: mahogany is selected and sliced ​​into straight grain to obtain hard open-grain wood veneer formaldehyde-free artificial board as the base material. After the solid wood board antique relief wire drawing machine is used to enhance the three-dimensional effect of the solid wood texture surface and standardize the shaping process, the surface of the base material is sanded and dusted.

[0062] S2 section (processing speed 16m / min): Intelligent biomimetic solid wood straight grain pattern UV base coating composite coating:

[0063] S201 process (coating amount is 50g / m²) 2 ): First UV base coat coating: On the surface of the substrate with open texture of straight wood veneer in section S1, roll-coat an odor-free, yellowing-resistant water-based UV transparent color-correcting primer and complete UV curing.

[0064] S202 process (coating amount is 10g / m²) 2 ): Coating of the second UV primer layer: On top of the first UV primer layer, roll-coat a clean, odor-free, yellowing-resistant UV transparent adhesive primer, and complete UV curing and surface polishing and cleaning;

[0065] S203 process (coating amount is 2g / m²) 2 ): The third UV base coating: On top of the second UV base coating, 3D digitally print 4~8 color odorless and yellowing resistant UV solid color intelligent bionic solid wood straight grain pattern ink image coating, and complete UV curing.

[0066] S204 process (coating amount is 15g / m²) 2 ): The fourth UV primer coating: On top of the third UV primer coating, roll-coat an odor-free, yellowing-resistant UV transparent hardening primer and complete UV curing;

[0067] S205 process (coating amount is 15g / m²) 2 ): The fifth UV primer coating: On top of the fourth UV primer coating, roll-coat an odor-free, yellowing-resistant UV transparent matte primer and complete UV curing;

[0068] Section S3 (processing speed 5m / min): Water-based topcoat composite coating: After polishing and cleaning the surface of the fifth UV primer coating, a multi-functional water-based topcoat (coating amount 60g / m²) is sprayed by an intelligent spraying robot. 2 First, the surface is humidified and heated for 5 minutes at 30℃ for leveling and heating with far-infrared light waves. Then, it is dried for 5 minutes in a heated and dehumidified dry heat environment at 35℃. Next, it is dried for 90 minutes in a heated and dehumidified dry heat environment at 50℃ for deep drying and odor removal. Finally, the coating is cooled and deodorized by cold air until the surface temperature reaches below 40℃ and there are no residual odor-causing substances on the surface. Only then can it be stacked and stored for natural conditioning. The process is completed after 24 hours of conditioning.

[0069] The density of mahogany in section S1 is 0.6 g / cm³. 3 The moisture content is 8%, and the veneer processing type is straight-grained slicing and splicing (the width of a single veneer unit should be controlled within 100mm) and gluing into a whole sheet of veneer; the veneer thickness is 0.40mm.

[0070] The antique relief wire drawing machine for solid wood panels used in the S1 section is a special wire drawing machine for solid wood panels equipped with at least three sets of six rows of steel or copper cylindrical needle-punched brush-type wire drawing rollers in the front, middle, and rear. The diameter specifications of the steel or copper wires of the steel or copper cylindrical needle-punched brushes used in each set of front, middle, and rear texture-forming devices are 0.5mm, 0.3mm, and 0.1mm, respectively. The power of the motor for each row of wire drawing brush rollers is 7.5KW. After the wire drawing device, a hard nylon brush cleaning roller and an airflow dust removal device are installed to clean and remove dust from the inner and outer surfaces of the solid wood open texture on the substrate.

[0071] The odor-free, yellowing-resistant water-based UV transparent color-correcting primer used in S201 is uniformly mixed from water-based UV clear primer, water-based transparent colorant, and pure water in a mass ratio of 10:1:1; its coating weight is 60g / m². 2The coating was applied twice using a forward roller coater. After coating, infrared drying was performed at 120℃ for 60 seconds. Then, UV radiation curing was applied; the coating was cured to 50% of its original strength. The water-based UV primer was Nippon Paint's WCU-G106, and the water-based transparent colorant was from BASF.

[0072] The odor-free, yellowing-resistant UV transparent adhesion primer used in S202 is composed of polyurethane acrylate, bisphenol A epoxy acrylate, isooctyl acrylate, and photoinitiator in a mass ratio of 5:3:1:1, wherein the photoinitiator is 1-hydroxy-cyclohexyl-phenyl ketone.

[0073] The odor-free, yellowing-resistant UV-cured smart biomimetic solid wood grain pattern ink used in S203 is composed of a prepolymer, tripropylene glycol diacrylate, pigment, photoinitiator, and additives in a mass ratio of 4:2:2:1:1. The prepolymer is a hexafunctional polyurethane acrylate resin U-CURE®9390, the photoinitiator is a mixture of MBF (methyl benzoylformate), TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide), and ITX (isopropylthioxanthrone) in equal proportions, and the additives are BYK 057 defoamer and BYK-333 leveling agent in equal mass ratios.

[0074] The odor-free, yellowing-resistant UV transparent hardening primer used in S204 is composed of ST-W9001 water-soluble organosilicon-modified acrylic resin, ethoxylated trimethylolpropane triacrylate, hydroxyethyl acrylate, photoinitiator, and nano silica filler in a mass ratio of 4:2:2:1:1. The photoinitiator is a mixture of MBF (methyl benzoylformate), TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide), and ITX (isopropylthioxanthrone) in equal proportions.

[0075] The odor-free, yellowing-resistant UV transparent matte primer used in S205 is composed of ethoxylated trimethylolpropane triacrylate, photoinitiator, and matting agent in a mass ratio of 3:3:1. The photoinitiator is a mixture of MBF (methyl benzoylformate), TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide), and ITX (isopropylthioxanthrone) in equal proportions, and the matting agent is Degussa matting agent OK607.

[0076] The S3 multi-functional water-based topcoat, by weight, includes 100 parts main agent, 15 parts curing agent, 2 parts anti-aging additive, 6 parts VOCs purifier, 4 parts anti-fingerprint additive, 4 parts scratch-resistant additive and 5 parts other additives.

[0077] The main component is a thermosetting conversion elastic base material composition emulsion of waterborne aliphatic and polyester polyurethane resin, organofluorine and organosilicon modified waterborne acrylate and polyurethane resin, and waterborne polyurethane-acrylate hybrid aqueous dispersion with a mass ratio of 3:1:1.

[0078] In the waterborne aliphatic and polyester polyurethane resins, the waterborne aliphatic polyurethane resin is isoflurone diisocyanate, the waterborne polyester polyurethane resin is nonionic waterborne polyester polyurethane, and the waterborne aliphatic and polyester polyurethane resins are an equal proportion of the two.

[0079] The organofluorine and organosilicon modified waterborne acrylate and polyurethane resins are a mixture of organofluorine and organosilicon modified waterborne acrylates and organofluorine and organosilicon modified polyurethane resins in equal proportions:

[0080] By weight, the organofluorine and organosilicon modified waterborne acrylate comprises 20 parts of fluorosilicone complex monomer, 20 parts of methyl methacrylate, 15 parts of butyl acrylate, 1 part of initiator ammonium persulfate, 3 parts of emulsifier sodium dodecylbenzenesulfonate, 2 parts of aziridine crosslinking agent CX-100, 0.5 parts of hindered phenolic antioxidant 1010, 0.5 parts of organosilicon leveling agent BYK-333, and 100 parts of deionized water. The fluorosilicone complex monomer is a mixture of dodecylfluoroheptyl methacrylate and γ-methacryloyloxypropyltrimethoxysilane in equal proportions.

[0081] By weight, the organofluorine and organosilicon modified polyurethane resin comprises 40 parts of a polyol composite system, 20 parts of isophorone diisocyanate, 10 parts of fluorosilicone modifier, 5 parts of chain extender, 12 parts of N,N-dimethylformamide, 5 parts of acetone, 1 part of phosphite antioxidant 168, and 1 part of light stabilizer 770.

[0082] The polyol composite system includes polytetrahydrofuran diol, polyethylene adipate diol, and perfluoropolyether polyol in a mass ratio of 5:2:1, and the fluorosilicone modifier is aminopropyl polydimethylsiloxane and perfluorooctyltrimethoxysilane in a mass ratio of 1:1.

[0083] In addition, by weight parts, the thermosetting conversion elastic binder composition emulsion of the waterborne polyurethane-acrylate hybrid aqueous dispersion comprises 20 parts of waterborne polyurethane prepolymer Mowipur 2677, 15 parts of methyl acrylate, 0.1 parts of initiator ammonium persulfate, 1 part of sodium dodecyl sulfate, 1 part of aziridine crosslinking agent CX-100, 2 parts of dimethylolpropionic acid, 0.2 parts of additives (leveling agent and defoamer in equal weight proportions) and 20 parts of deionized water.

[0084] The curing agent is a mixture of hydrophilic and oleophobic modified aliphatic polyisocyanate (Covestro Bayhydur 401-70), epoxy resin with alcohol hydroxyl groups (Hanssen EPON 1004F epoxy resin), and hydrophilic and oleophobic modified alicyclic polyisocyanate in equal proportions.

[0085] The hydrophilic and oleophobic modified alicyclic polyisocyanate comprises, by weight, 10 parts isophorone diisocyanate, 2 parts polyethylene glycol monomethyl ether, 0.5 parts perfluorooctyl ethanol and 0.05 parts dibutyl dilaurate.

[0086] The anti-aging additives are a mixture of 2-hydroxy-4-methoxybenzophenone, 4-hydroxy-2,2,6,6-tetramethylpiperidine, hexyl diethylaminohydroxybenzoylbenzoate, ethylhexyl methoxycinnamate, and rutile gas-phase nano-titanium dioxide and nano-zinc dioxide in equal proportions.

[0087] The VOCs purifier is a composition of gas-phase nano-photocatalyst, chitosan, and ethylene urea in equal proportions.

[0088] The anti-fingerprint additive is a composition of equal proportions of thioctic acid and organosilicon-modified polyacrylate solution with functional hydroxyl groups (BYK-SILCLEAN3700, 30wt%).

[0089] The scratch-resistant additive is a mixture of fumed nano aluminum oxide and fumed nano silica dispersion in equal proportions.

[0090] Other additives include an equal mass ratio mixture of defoamer (polydimethylsiloxane), leveling agent (polyethersiloxane), wetting agent (siloxane dual surfactant), and viscosity modifier (pure water).

[0091] Furthermore, the water-based UV-based odor-neutralizing and yellowing-resistant color-correcting primer in S201 is applied twice using a forward roller coater. After coating, infrared drying is performed first at 100℃ for 50 seconds. Then, UV radiation drying and curing are required, with the coating achieving 50% curing.

[0092] In section S202, the primer coating is applied in one pass using a forward roller coater. After coating, UV radiation curing is performed, with the product reaching 50% dryness. The surface is then polished using a four-roller DuPont bristle polisher to remove splinters, pores, conduits, and other debris from the fine texture of the board surface. This ensures no sanding dust accumulates within the fine texture, preventing excessive liquid coating from adsorbing and accumulating inside the conduits, thus hindering the instantaneous and uniform curing to the desired effect during UV radiation curing and preventing the retention of various volatile small-molecule VOCs (volatile organic compounds) that cause odor.

[0093] In S203, each color of ink is applied separately using a piezoelectric printer printhead for non-contact inkjet printing and UV-LED light radiation pre-curing. After each color image coating is applied, it needs to be cured together by UV light radiation, and the coating is dried and cured to 50% of its original state.

[0094] S204 UV transparent odor-free anti-yellowing hardening primer is applied in one pass using a forward roller coater. After coating, it is cured by UV radiation, and the degree of dryness after UV radiation curing is 50% dry.

[0095] The UV transparent odorless and yellowing resistant matte primer in S205 is applied in two stages using a bidirectional forward and reverse roller coating machine. After coating, it is cured by UV radiation, and the degree of drying after UV radiation curing is 90% dry.

[0096] The multi-functional water-based topcoat in the S3 section above is applied by intelligent robotic spraying using a reciprocating spraying method with 8 staggered nozzles arranged in two rows in a direction perpendicular to the running direction of the board. The spraying pressure is 0.2 MPa.

[0097] Furthermore, the drying and curing process for the UV coating to achieve 50% curing is as follows: one high-pressure UV gallium lamp and one high-pressure UV mercury lamp are fully operational, with each lamp having a power of 12KW; the UV light radiation curing irradiation time is 2 seconds, and the energy control process uses a UVA energy value of 200mJ / cm². 2 UVV energy value: 400mJ / cm 2 .

[0098] The drying and curing process for 90% curing of the UV coating is as follows: two high-pressure UV gallium lamps and four high-pressure UV mercury lamps are fully open, with each lamp having a power of 12KW; the UV radiation curing irradiation time is 4 seconds, and the energy control process uses a UVA energy value of 400mJ / cm². 2 UVV energy value: 1200mJ / cm 2 .

[0099] Example 2

[0100] The difference from Example 1 is that in this example, section S1 uses okoume wood as the base material, and the density of okoume wood is 0.55 g / cm³. 3 The moisture content is 12%, and the veneer processing type is straight-grained slicing and splicing (the width of a single veneer unit is controlled within 150mm) and gluing into a whole sheet of veneer; the veneer thickness is 0.35mm.

[0101] Furthermore, the processing speed of section S1 is 6 m / min, the processing speed of section S2 is 18 m / min, and the processing speed of section S3 is 6 m / min.

[0102] In S201, the coating amount is 80 g / m². 2 In S202, the coating amount is 20 g / m². 2 In S203, the coating weight of each color ink is 6 g / m². 2 In S204, the coating amount is 25 g / m². 2 In S205, the coating amount is 25 g / m². 2 In S3, the coating weight of the multi-functional water-based topcoat is 100g / m². 2 .

[0103] In S3, the multifunctional water-based topcoat comprises, by weight, 100 parts main agent, 5 parts curing agent, 0.2 parts anti-aging agent, 3 parts VOCs purifier, 2 parts anti-fingerprint agent, 2 parts scratch-resistant agent, and 1 part other additives. The composition and proportion of the main agent, curing agent, anti-aging agent, VOCs purifier, anti-fingerprint agent, scratch-resistant agent, and other additives are the same as in Example 1.

[0104] The application rate of the multi-functional water-based topcoat in S3 is 100g / m². 2 After coating is completed, the surface is first humidified and heated for 5 minutes at 40℃ for leveling and heating with far-infrared light waves. Then, it is dried for 5 minutes in a heated and dehumidified dry heat environment at 45℃. Next, it is dried for 120 minutes in a heated and dehumidified dry heat environment at 60℃ for deep drying and odor removal. Finally, the coating is cooled and deodorized by cold air until the surface temperature reaches below 40℃ and there are no residual odor-causing substances on the surface. Only then can it be stacked and stored for curing. The process is completed after curing for 24 hours.

[0105] Example 3

[0106] The difference from Example 1 is that in this example, section S1 uses yellow tung wood as the base material, and the density of okoume wood is 0.8 g / cm³. 3 The moisture content is 6%, and the veneer processing type is straight-grained slicing and splicing (the width of a single veneer unit is controlled at 250mm) and glued into a whole sheet of veneer; the veneer thickness is 0.5mm.

[0107] Furthermore, the processing speed of section S1 is 12 m / min, the processing speed of section S2 is 16 m / min, and the processing speed of section S3 is 6 m / min.

[0108] In S201, the coating amount is 60 g / m². 2 In S202, the coating amount is 15 g / m². 2 In S203, the coating weight of each color ink is 1 g / m². 2In S204, the coating amount is 20 g / m². 2 In S205, the coating amount is 20 g / m². 2 In S3, the application rate of the multi-functional water-based topcoat is 80 g / m². 2 .

[0109] In S3, the multifunctional water-based topcoat comprises, by weight, 100 parts main agent, 10 parts curing agent, 1 part anti-aging agent, 5 parts VOCs purifier, 3 parts anti-fingerprint agent, 3 parts scratch-resistant agent, and 3 parts other additives. The composition and proportion of the main agent, curing agent, anti-aging agent, VOCs purifier, anti-fingerprint agent, scratch-resistant agent, and other additives are the same as in Example 1.

[0110] The application rate of the multi-functional water-based topcoat in S3 is 80g / m². 2 After coating is completed, the surface is first humidified and heated for 5 minutes at 35℃ for leveling and heating with far-infrared light waves. Then, it is dried for 5 minutes in a heated and dehumidified dry heat environment at 40℃. Next, it is dried for 100 minutes in a heated and dehumidified dry heat environment at 55℃ for deep drying and odor removal. Finally, the coating is cooled and deodorized by cold air until the surface temperature reaches below 40℃ and there are no residual odor-causing substances on the surface. Only then can it be stacked and stored for curing. The process is completed after 24 hours of curing.

[0111] Comparative Example

[0112] The difference between this comparative example and Example 1 is that the coating process of S201 is not performed in S2, and the multi-functional water-based topcoat used in S3 is replaced with water-based acrylic topcoat (Three Trees Fresh Breath Diamond Water-based Wood Coating).

[0113] For the surface treatment of the wood veneer open texture intelligent bionic solid wood straight grain pattern water-based paint board in the above embodiments and comparative examples, the finished products were tested. The test methods for formaldehyde emission, resistance to thermal cycling, scratch resistance, stain resistance, crack resistance, yellowing resistance, and light fastness were in accordance with GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels". The results are shown in Table 1.

[0114] Table 1

[0115]

[0116] By comparing Examples 1-3 with the comparative examples, it can be seen that Examples 1-3 of this application all have good surface simulation. The scratch resistance, stain resistance, crack resistance, yellowing resistance, and light fastness of Examples 1-3 are all higher than those of the comparative examples. The resistance to thermal cycling of the examples and the comparative examples is not much different. The finish obtained by the process of the comparative examples still has a high formaldehyde release and TVOC release.

[0117] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A veneer open-grain intelligent bionic solid wood straight-grain patterned water paint plate finishing process, characterized in that, It comprises the following steps: S1 section: straight-grain veneer open texture modeling: select the ordinary broad-leaved tree wood with medium to thick pore structure or semi-ring-pore wood, plane cut straight-grain to get hard open wood veneer facing formaldehyde-free plywood as base material, use solid wood board antique relief wire drawing machine to strengthen and standardize the modeling processing of the wood veneer layer surface of the base material, then sand the surface of the base material to remove dust; S2 section: intelligent bionic solid wood straight-grain color UV primer composite coating: S201 process: coating of the first UV primer coating: roll-coat odorless yellow-resistant water-based UV transparent color correction primer on the surface of the straight-grain veneer open texture modeling base material in the S1 section and complete UV photocuring; S202 process: coating of the second UV primer coating: roll-coat odorless yellow-resistant UV transparent adhesion primer on the first UV primer coating, complete UV photocuring, and polish and clean the coating surface; S203 process: coating of the third UV primer coating: 3D digital print 4-8 color odorless yellow-resistant UV solid color intelligent bionic solid wood straight-grain color ink image coating on the second UV primer coating, and complete UV photocuring; S204 process: coating of the fourth UV primer coating: roll-coat odorless yellow-resistant UV transparent hardening primer on the third UV primer coating, and complete UV photocuring; S205 process: coating of the fifth UV primer coating: roll-coat odorless yellow-resistant UV transparent matte primer on the fourth UV primer coating, and complete UV photocuring; S3 section: water paint surface coating composite coating: polish and clean the surface of the fifth UV primer coating, then spray multifunctional water-based topcoat by intelligent spraying robot, complete finishing process after warm and humid leveling, warm and dry drying, and air cooling odorless; The multifunctional water-based topcoat comprises 100 parts of main agent, 5-15 parts of curing agent, 0.2-2 parts of anti-aging additive, 3-6 parts of VOCs purifying agent, 2-4 parts of anti-fingerprint additive, 2-4 parts of scratch-resistant additive, and 1-5 parts of other additives, according to mass fraction; The main agent comprises a thermosetting conversion type elastic base composition emulsion of water-based aliphatic and polyester polyurethane resin, organic fluorine and organic silicon modified water-based acrylate and polyurethane resin, and water-based polyurethane-acrylate hybrid water dispersion in a mass ratio of 3:1:1; In the water-based aliphatic and polyester polyurethane resin, the water-based aliphatic polyurethane resin is isophorone diisocyanate, and the water-based polyester polyurethane resin is a non-ionic water-based polyester polyurethane, and the water-based aliphatic and polyester polyurethane resin is an equal proportion composition of both; The thermosetting conversion type elastic base composition emulsion of water-based polyurethane-acrylate hybrid water dispersion comprises 20 parts of water-based polyurethane prepolymer, 15 parts of methyl acrylate, 0.1 part of initiator ammonium persulfate, 1 part of sodium dodecyl sulfate, 1 part of aziridine, 2 parts of dimethylol propionic acid, 0.2 part of additive, and 20 parts of deionized water, according to mass fraction; The other additives include defoaming agent, leveling agent, wetting agent, and viscosity regulator. The organic fluorine and organic silicon modified water-based acrylate and polyurethane resin is an equal proportion mixture of an organic fluorine and organic silicon modified water-based acrylate and an organic fluorine and organic silicon modified polyurethane resin; The organic fluorine and organic silicon modified water-based acrylate comprises, in terms of mass fraction, 20 parts of fluorosilicon composite monomer, 20 parts of methyl methacrylate, 15 parts of butyl acrylate, 1 part of initiator, 3 parts of emulsifier, 2 parts of aziridine crosslinking agent, 0.5 parts of hindered phenol antioxidant 1010, 0.5 parts of organic silicon leveling agent and 100 parts of deionized water, wherein the fluorosilicon composite monomer is an equal proportion mixture of dodecafluoroheptyl methacrylate and gamma-methacryloxypropyl trimethoxysilane; The organic fluorine and organic silicon modified polyurethane resin comprises, in terms of mass fraction, 40 parts of polyol composite system, 20 parts of isophorone diisocyanate, 10 parts of fluorosilicon modifier, 5 parts of chain extender, 12 parts of N,N-dimethylformamide, 5 parts of acetone, 1 part of phosphite antioxidant and 1 part of light stabilizer; The polyol composite system comprises polytetrahydrofuran diol, polyethylene adipate diol and perfluoropolyether polyol at a mass ratio of 5:2:1; The fluorosilicon modifier is a mixture of aminopropyl polydimethylsiloxane and perfluorooctyltrimethoxysilane at a mass ratio of 1:

1.

2. The veneer open-grain intelligent bionic straight-grain color water paint board finishing process according to claim 1, wherein: The substrate density in the S1 section is 0.5-0.8 g / cm 3 The wood veneer is a straight-grain sliced multi-ply glue integrated whole veneer with a moisture content of 6-12%, a processing type of straight-grain, a single-veneer unit width of 100-250 mm, and a veneer thickness of 0.35-0.50 mm.

3. The veneer open-grain intelligent bionic straight-grain color water paint board finishing process according to claim 1, wherein: The curing agent is an equal proportion combination of hydrophilic and oleophobic modified aliphatic polyisocyanate, epoxy resin with alcohol hydroxyl, and hydrophilic and oleophobic modified alicyclic polyisocyanate; The anti-aging aid is an equal proportion combination of 2-hydroxy-4-methoxybenzophenone, 4-hydroxy-2,2,6,6-tetramethylpiperidine, diethylamino hydroxybenzoyl hexyl benzoate, methoxycinnamic acid ethylhexyl ester, rutile type fumed nano titanium dioxide and nano zinc dioxide; The VOCs purifier is an equal proportion combination of fumed nano photocatalyst, chitosan and ethylene urea; The anti-fingerprint aid is an equal proportion combination of lipoic acid and organic silicon modified polyacrylate solution with functional hydroxyl groups; The scratch-resistant aid is an equal proportion combination of fumed nano aluminum oxide and fumed nano silicon dioxide dispersion.

4. The veneer open-grain intelligent bionic straight-grain color water paint board finishing process according to claim 1, wherein: The processing speed of the S1 section is 6-12 m / min; The processing speed of the S2 section is 16-18 m / min; The processing speed of the S3 section is 5-6 m / min.

5. The veneer open-grain intelligent bionic straight-grain color water paint board finishing process according to claim 1, wherein: In the S201, the coating amount is 50-80 g / m 2 ; In the S202, the coating amount is 10-20 g / m 2 ; The coating amount of each color ink in S203 is 1 to 6 g / m 2 ; In the S204, the coating amount is 15-25 g / m 2 ; In the S205, the coating amount is 15-25 g / m 2 ; The coating amount of the multifunctional water-based topcoat in S3 is 60-100 g / m 2 After the coating is completed, first, a humidified and warmed far infrared light wave flow leveling and heating treatment is performed at 30-40°C for 5 minutes, and then a secondary surface layer drying treatment is performed at a warmed and dehumidified dry heat environment of 35-45°C for 5 minutes; next, a deep drying and odor removal treatment is performed at a warmed and dehumidified dry heat environment of 50-60°C for 90-120 minutes; finally, a cold air cooling and temperature reduction treatment is performed on the board surface coating, and an odor removal treatment is performed until the surface temperature reaches below 40°C and there is no residual odor-causing substance on the surface, and then a stacking and natural storage and curing process is performed; the process is completed after 24 hours of curing.

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