Formaldehyde-free printing decorative paper, preparation method therefor, and surface decorated wood-based panel

Abstract

The present invention relates to the technical field of decorative paper, and in particular to formaldehyde-free printing decorative paper, a preparation method therefor, and a surface decorated wood-based panel. The formaldehyde-free printing decorative paper comprises print base paper and a resin protection layer, wherein the resin protection layer is made from a protection layer impregnation glue; and the protection layer impregnation glue comprises the following raw materials in parts by weight: 50-60 parts of an acrylic emulsion, 12-18 parts of modified epoxy acrylate, 6-10 parts of an organic silicon resin, 8-12 parts of a filler, 6-10 parts of polyvinyl alcohol, 3-6 parts of polyethylene glycol, 3-6 parts of a silane coupling agent, 2-4 parts of a curing agent, and 12-18 parts of deionized water. The formaldehyde-free printing decorative paper has excellent performance such as scratch resistance, pollution and corrosion resistance, and water vapor resistance, and can greatly reduce release of formaldehyde; the method for the formaldehyde-free printing decorative paper involves a simple process, is convenient to operate, and has high production efficiency and low production costs; and the manufactured surface decorated wood-based panel has good decoration performance, is environmentally friendly and has a long service life.

Description

Formaldehyde-free printed decorative paper, preparation method thereof, and veneer artificial board Technical Field

[0001] The present invention relates to the technical field of decorative paper, and in particular to formaldehyde-free printed decorative paper, a preparation method thereof, and a veneered artificial board. Background Art

[0002] With the progress of society and the improvement of people's living standards, veneered wood-based panels have been widely used in interior decoration, furniture and other fields. Decorative paper is an important veneer material for decorative panels, which can provide good protection and decoration for wooden panels and enhance the visual effect.

[0003] Decorative paper in the prior art is typically made by printing patterns or text on base paper and then impregnating it with an impregnating adhesive. However, this impregnation process often uses a two-stage process: urea-formaldehyde adhesive and melamine-formaldehyde adhesive. This improves the durability and decorative effect of the decorative board. However, the resulting products release free formaldehyde during production and use, polluting the environment and posing a health hazard to humans. Therefore, it is of great significance to improve existing decorative paper and veneered artificial boards to achieve formaldehyde-free properties, reduce formaldehyde emissions, and enhance decorative properties and durability.

[0004] Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide an environmentally friendly, formaldehyde-free printed decorative paper with excellent decorativeness and durability, and good environmental protection, which can greatly reduce the release of formaldehyde and reduce pollution to the environment.

[0006] Another object of the present invention is to provide a method for preparing formaldehyde-free printed decorative paper, which has simple process, convenient operation, high production efficiency, low production cost, and is conducive to industrial production.

[0007] Another object of the present invention is to provide a veneered artificial board, which is laminated with the above-mentioned printed decorative paper, has good decorative properties, is environmentally friendly, and has a long service life.

[0008] The objectives of the present invention are achieved through the following technical solution: a formaldehyde-free printed decorative paper, comprising a printing base paper and a resin protective layer coated on the surface of the printing base paper, wherein the resin protective layer is made of a protective layer impregnating glue, and the protective layer impregnating glue comprises the following raw materials in parts by weight: 50-60 parts of acrylic emulsion, 12-18 parts of modified epoxy acrylate, 6-10 parts of silicone resin, 8-12 parts of filler, 6-10 parts of polyvinyl alcohol, 3-6 parts of polyethylene glycol, 3-6 parts of silane coupling agent, 2-4 parts of curing agent, and 12-18 parts of deionized water.

[0009] The present invention combines raw materials such as acrylic emulsion, modified epoxy acrylate, silicone resin, filler, polyvinyl alcohol, and polyethylene glycol, and uniformly disperses the raw materials to produce a protective layer impregnating adhesive. The resin protective layer formed after curing of the protective layer impregnating adhesive has good adhesion to the base paper, providing excellent protection for the printing base paper and improving its scratch resistance, pollution and corrosion resistance, and other properties. Preferably, the printing base paper is digital printing base paper, and digital printing of patterns and text is efficient and flexible, resulting in patterns and text with advantages such as high resolution and high color reproduction, thereby enhancing the decorative effect of the decorative paper.

[0010] Furthermore, the preparation method of the protective layer impregnation glue includes the following steps: adding acrylic emulsion, modified epoxy acrylate, and silicone resin in proportion, heating to 55-65°C, adding a curing agent and polyvinyl alcohol, and adding polyethylene glycol after heat preservation and reaction for 20-30 minutes, continuing the reaction for 20-30 minutes, and then adding deionized water, silane coupling agent and filler, stirring for 15-20 minutes at a stirring speed of 900-1200 r / min, and standing to obtain the protective layer impregnation glue.

[0011] Furthermore, the filler is at least one of nano-calcium carbonate, nano-silicon dioxide and nano-zinc oxide.

[0012] Furthermore, the silane coupling agent is at least one of γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane and γ (vinyltri(β-methoxyethoxy)silane).

[0013] Furthermore, the curing agent is at least one of triethylenetetramine, triethylamine and N-hydroxymethyl acrylamide.

[0014] Furthermore, the preparation method of each modified epoxy acrylate comprises the following steps:

[0015] A1. Mix 35-45 parts of propylene glycol methyl ether and 1-1.5 parts of oleic acid, and then add 6-9 parts of butyl titanate. Heat to 72-78°C, keep warm for 2-3 hours, and filter. Wash the resulting precipitate with deionized water and dry it. Add 30-35 parts of deionized water and 10-14 parts of triester phosphate to obtain a mixture A.

[0016] A2. Mixture A is heated to 85-95° C. under nitrogen protection, and then 30-34 parts of bisphenol A epoxy resin, 0.5-1.5 parts of catalyst, and 0.2-0.4 parts of polymerization inhibitor are added. 6-9 parts of acrylic acid, 4-7 parts of methyl methacrylate, and 4-7 parts of styrene are added dropwise and stirred evenly. The mixture is heated to 105-115° C. and reacted at a constant temperature. When the acid value drops to below 3 mg KOH / g, the temperature is lowered to obtain modified epoxy acrylate.

[0017] The present invention utilizes the aforementioned raw materials and preparation method, and controls the process parameters of each step to produce epoxy acrylate. The epoxy acrylate, when added to the protective layer impregnation adhesive, achieves excellent compatibility with acrylic emulsion, silicone resin, polyvinyl alcohol, and polyglycol, helping to improve the mechanical properties, water resistance, and corrosion resistance of the resin protective layer, thereby extending the service life of the decorative paper. The bisphenol A epoxy resin is epoxy resin E-44.

[0018] Furthermore, in step A2, the catalyst is at least one of tetraethylammonium bromide, tetrabutylammonium bromide, triethylamine, N,N-dimethylbenzylamine, trimethylbenzylammonium chloride and triphenylphosphine.

[0019] Furthermore, in step A2, the polymerization inhibitor is at least one of p-methoxyphenol, hydroquinone, and 2,5-dimethylhydroquinone.

[0020] Another object of the present invention is achieved by the following technical solution: the preparation method of the above-mentioned formaldehyde-free printed decorative paper includes the following steps: impregnating the printing base paper in a protective layer impregnation glue, forming a resin protective layer after drying, and preparing the formaldehyde-free printed decorative paper.

[0021] Furthermore, the drying temperature is 105-110° C., and the drying time is 1.5-3 minutes.

[0022] Another object of the present invention is achieved through the following technical solution: a veneered artificial board, comprising a board body and formaldehyde-free printed decorative paper, wherein the formaldehyde-free printed decorative paper is adhered to the surface of the board body.

[0023] Furthermore, the preparation method of the above-mentioned veneered artificial board includes the following steps: hot pressing the formaldehyde-free printed decorative paper onto the surface of the board to obtain the veneered artificial board.

[0024] Furthermore, the hot pressing temperature is 125-135° C., the pressure is 0.9-1.3 MPa, and the hot pressing time is 90-150 s.

[0025] The beneficial effects of the present invention are as follows: the formaldehyde-free printed decorative paper of the present invention is obtained by impregnating the printed base paper with a protective layer impregnating adhesive, which forms a dense resin protective layer on the surface of the printed base paper after curing. The paper has excellent properties such as scratch resistance, pollution corrosion resistance, and water vapor resistance, and can greatly reduce the release of formaldehyde, thereby reducing pollution to the environment. The preparation method of the formaldehyde-free printed decorative paper of the present invention is simple in process, easy to operate, high in production efficiency, low in production cost, and is conducive to industrial production. The veneered artificial board prepared by the present invention, which is laminated with the above-mentioned printed decorative paper, has good decorative properties, is environmentally friendly, and has a long service life. DETAILED DESCRIPTION

[0026] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments. The contents mentioned in the embodiments are not intended to limit the present invention.

[0027] Example 1

[0028] In this embodiment, a formaldehyde-free printed decorative paper comprises a base printing paper and a resin protective layer coated on the surface of the base printing paper. The resin protective layer is made of a protective layer impregnating adhesive. The protective layer impregnating adhesive comprises the following raw materials in parts by weight: 55 parts acrylic emulsion, 16 parts modified epoxy acrylate, 8 parts silicone resin, 10 parts filler, 8 parts polyvinyl alcohol, 5 parts polyethylene glycol, 4 parts silane coupling agent, 3 parts curing agent, and 16 parts deionized water. The acrylic emulsion is BASF JONCRYL HRC 1661 acrylic emulsion, and the silicone resin is Klamar ZY1053 silicone resin.

[0029] Furthermore, the preparation method of the protective layer impregnation glue includes the following steps: adding acrylic emulsion, modified epoxy acrylate, and silicone resin in proportion, heating to 60°C, adding a curing agent and polyvinyl alcohol, and adding polyethylene glycol after heat preservation and reaction for 25 minutes, continuing the reaction for 25 minutes, and then adding deionized water, silane coupling agent and filler, stirring for 20 minutes at a stirring speed of 1000 r / min, and standing to obtain a protective layer impregnation glue.

[0030] Furthermore, the filler is composed of nano-silicon dioxide and nano-zinc oxide in a mass ratio of 1:1. The silane coupling agent is composed of γ-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane in a mass ratio of 1:2. The curing agent is triethylamine.

[0031] Furthermore, the preparation method of each modified epoxy acrylate comprises the following steps:

[0032] A1. By weight, 40 parts of propylene glycol methyl ether and 1.2 parts of oleic acid were mixed uniformly, and then 8 parts of butyl titanate were added. The mixture was heated to 75° C. and kept warm for 2.5 hours. The resulting precipitate was filtered and washed with deionized water and dried. 32 parts of deionized water and 12 parts of triester phosphate were added to obtain a mixture A.

[0033] A2. Mixture A was heated to 90° C. under nitrogen protection, and then 32 parts of bisphenol A epoxy resin, 1 part of catalyst, and 0.3 part of polymerization inhibitor were added. 7 parts of acrylic acid, 5 parts of methyl methacrylate, and 6 parts of styrene were added dropwise and stirred evenly. The temperature was raised to 1010° C. and the reaction was carried out at a constant temperature. When the acid value dropped to below 3 mgKOH / g, the temperature was lowered to obtain modified epoxy acrylate.

[0034] Furthermore, the bisphenol A epoxy resin is epoxy resin E-44.

[0035] Furthermore, in step A2, the catalyst is tetraethylammonium bromide and the polymerization inhibitor is hydroquinone.

[0036] In this embodiment, the method for preparing the formaldehyde-free printed decorative paper includes the following steps: impregnating the printing base paper in a protective layer impregnation glue, forming a resin protective layer after drying, and preparing the formaldehyde-free printed decorative paper, the drying temperature is 108° C., and the drying time is 2 minutes.

[0037] In this embodiment, a veneered artificial board includes a board body and formaldehyde-free printed decorative paper, wherein the formaldehyde-free printed decorative paper is adhered to the surface of the board body.

[0038] Furthermore, the preparation method of the above-mentioned veneered artificial board includes the following steps: hot pressing the formaldehyde-free printed decorative paper to the surface of the board, the hot pressing temperature is 130°C, the pressure is 1.1 MPa, and the hot pressing time is 120s to obtain the veneered artificial board.

[0039] Example 2

[0040] In this embodiment, a formaldehyde-free printed decorative paper comprises a base printing paper and a resin protective layer coated on the surface of the base printing paper. The resin protective layer is made of a protective layer impregnating adhesive. The protective layer impregnating adhesive comprises the following raw materials in parts by weight: 55 parts acrylic emulsion, 15 parts modified epoxy acrylate, 9 parts silicone resin, 11 parts filler, 7 parts polyvinyl alcohol, 4 parts polyethylene glycol, 5 parts silane coupling agent, 3 parts curing agent, and 17 parts deionized water. The remainder of this embodiment is the same as in Example 1.

[0041] Example 3

[0042] In this embodiment, a formaldehyde-free printed decorative paper includes a printing base paper and a resin protective layer coated on the surface of the printing base paper, wherein the resin protective layer is made of a protective layer impregnating glue, and the protective layer impregnating glue includes the following raw materials in parts by weight: 50 parts of acrylic emulsion, 12 parts of modified epoxy acrylate, 6 parts of silicone resin, 8 parts of filler, 6 parts of polyvinyl alcohol, 3 parts of polyethylene glycol, 3 parts of silane coupling agent, 2 parts of curing agent, and 12 parts of deionized water.

[0043] Furthermore, the preparation method of the protective layer impregnation glue includes the following steps: adding acrylic emulsion, modified epoxy acrylate, and silicone resin in proportion, heating to 55°C, adding a curing agent and polyvinyl alcohol, keeping warm for 30 minutes, adding polyethylene glycol, continuing the reaction for 30 minutes, and then adding deionized water, silane coupling agent and filler, stirring for 15 minutes at a stirring speed of 1200 r / min, and standing to obtain a protective layer impregnation glue.

[0044] Furthermore, the filler is composed of nano-calcium carbonate and nano-silicon dioxide in a mass ratio of 1:1. The silane coupling agent is γ-glycidyloxypropyltrimethoxysilane. The curing agent is triethylenetetramine.

[0045] Furthermore, the preparation method of each modified epoxy acrylate comprises the following steps:

[0046] A1. Mix 35 parts of propylene glycol methyl ether and 1 part of oleic acid, and then add 6 parts of butyl titanate. Heat to 72°C, keep warm for 3 hours, and filter. Wash the resulting precipitate with deionized water and dry it. Add 30 parts of deionized water and 10 parts of triester phosphate to obtain a mixture A.

[0047] A2. Mixture A was heated to 85° C. under nitrogen protection, and then 30 parts of bisphenol A epoxy resin, 0.5 parts of catalyst, and 0.2 parts of polymerization inhibitor were added. 6-9 parts of acrylic acid, 4 parts of methyl methacrylate, and 4 parts of styrene were added dropwise and stirred evenly. The mixture was heated to 105° C. and reacted at a constant temperature. When the acid value dropped to below 3 mgKOH / g, the temperature was lowered to obtain modified epoxy acrylate.

[0048] Furthermore, in step A2, the catalyst is tetrabutylammonium bromide and the polymerization inhibitor is p-methoxyphenol.

[0049] In this embodiment, the method for preparing the above-mentioned formaldehyde-free printed decorative paper includes the following steps: impregnating the printing base paper in a protective layer impregnation glue, forming a resin protective layer after drying, and preparing the formaldehyde-free printed decorative paper, the drying temperature is 105° C., and the drying time is 3 minutes.

[0050] In this embodiment, a veneered artificial board comprises a board and formaldehyde-free printed decorative paper, the formaldehyde-free printed decorative paper being adhered to the surface of the board. A method for preparing the veneered artificial board comprises the following steps: hot pressing the formaldehyde-free printed decorative paper onto the surface of the board at a temperature of 125°C, a pressure of 1.3 MPa, and a time of 150 seconds to produce the veneered artificial board.

[0051] Example 4

[0052] In this embodiment, a formaldehyde-free printed decorative paper includes a printing base paper and a resin protective layer coated on the surface of the printing base paper, wherein the resin protective layer is made of a protective layer impregnating glue, and the protective layer impregnating glue includes the following raw materials in parts by weight: 60 parts of acrylic emulsion, 18 parts of modified epoxy acrylate, 10 parts of silicone resin, 12 parts of filler, 10 parts of polyvinyl alcohol, 6 parts of polyethylene glycol, 6 parts of silane coupling agent, 4 parts of curing agent, and 18 parts of deionized water.

[0053] Furthermore, the preparation method of the protective layer impregnation glue includes the following steps: adding acrylic emulsion, modified epoxy acrylate, and silicone resin in proportion, heating to 65°C, adding a curing agent and polyvinyl alcohol, keeping warm for 20 minutes, adding polyethylene glycol, continuing the reaction for 30 minutes, and then adding deionized water, silane coupling agent and filler, stirring for 20 minutes at a stirring speed of 900 r / min, and standing to obtain a protective layer impregnation glue.

[0054] Furthermore, the filler is composed of nano calcium carbonate and nano zinc oxide in a mass ratio of 1:2. The silane coupling agent is γ (vinyl tris (β-methoxyethoxy) silane). The curing agent is N-hydroxymethyl acrylamide.

[0055] Furthermore, the preparation method of each modified epoxy acrylate comprises the following steps:

[0056] A1. By weight, 45 parts of propylene glycol methyl ether and 1.5 parts of oleic acid were mixed uniformly, and then 9 parts of butyl titanate were added. The mixture was heated to 78° C. and kept warm for 2 hours, and then filtered. The resulting precipitate was washed with deionized water and dried. 35 parts of deionized water and 14 parts of triester phosphate were added to obtain a mixture A.

[0057] A2. Mixture A was heated to 95° C. under nitrogen protection, and then 34 parts of bisphenol A epoxy resin, 1.5 parts of catalyst, and 0.4 parts of polymerization inhibitor were added. 9 parts of acrylic acid, 7 parts of methyl methacrylate, and 7 parts of styrene were added dropwise and stirred evenly. The temperature was raised to 115° C. and the reaction was carried out at a constant temperature. When the acid value dropped to below 3 mg KOH / g, the temperature was lowered to obtain modified epoxy acrylate.

[0058] Furthermore, in step A2, the catalyst is triphenylphosphine and the polymerization inhibitor is 2,5-dimethylhydroquinone.

[0059] In this embodiment, the method for preparing the above-mentioned formaldehyde-free printed decorative paper includes the following steps: impregnating the printing base paper in a protective layer impregnation glue, forming a resin protective layer after drying, and preparing the formaldehyde-free printed decorative paper, the drying temperature is 110° C., and the drying time is 1.5 minutes.

[0060] Another object of the present invention is achieved through the following technical solution: a veneered artificial board, comprising a board body and formaldehyde-free printed decorative paper, wherein the formaldehyde-free printed decorative paper is adhered to the surface of the board body.

[0061] Furthermore, the preparation method of the above-mentioned veneered artificial board includes the following steps: hot pressing the formaldehyde-free printed decorative paper to the surface of the board, the hot pressing temperature is 135° C., the pressure is 1 MPa, and the hot pressing time is 90 seconds to obtain the veneered artificial board.

[0062] Comparative Example 1

[0063] The difference between this comparative example and Example 1 is that the protective layer impregnation glue does not contain modified epoxy acrylate, and an equal amount of acrylic emulsion is used instead.

[0064] Comparative Example 2

[0065] The difference between this comparative example and Example 1 is that the protective layer impregnating glue does not contain silicone resin, and an equal amount of acrylic emulsion is used instead.

[0066] Comparative Example 3

[0067] The difference between this comparative example and Example 1 is that the protective layer impregnating glue does not contain polyvinyl alcohol.

[0068] The printed decorative paper from Example 1 and Comparative Examples 1-3 was laminated on one side of a wood-based panel, where the panel was a fiberboard, to produce a veneered wood-based panel. The density of the veneered wood-based panel was 0.65-0.8 g / cm³. Properties of the printed decorative paper and the veneered wood-based panel were measured.

[0069] The formaldehyde emission and adhesive content of the printed decorative paper were tested in accordance with GB / T 28995-2012, and the appearance quality of the printed decorative paper was observed. The printed decorative paper of Example 1 and Comparative Examples 1-3 showed no surface damage, stains, or gaps, and the product appearance quality all met the GB / T 28995-2012 standard. The formaldehyde emission of the printed decorative paper was 0 mg / L, and the adhesive content of the paper of Example 1 and Comparative Examples 1-3 was 78%, 66%, 74%, and 61%, respectively.

[0070] In accordance with GB / T15102-2017, the surface bonding strength, surface scratch resistance (≥1.5N surface without more than 90% scratches), surface pollution and corrosion resistance (the time when the pollutant is placed on the reagent surface at room temperature: 25% sodium hydroxide solution 10 minutes, soap solution 24 hours, cola beverage 16 hours), surface light fastness and resistance to hot and cold cycles of the veneer wood-based panels were tested. The test results are shown in the following table:

[0071] As can be seen from the table above, the present invention combines acrylic emulsion, modified epoxy acrylate, silicone resin, and polyvinyl alcohol to produce a protective layer impregnation adhesive. The cured resin protective layer provides excellent protection for the printed paper. When applied to veneer panels, the printed decorative paper achieves a good bond with the panel itself, resulting in excellent scratch resistance, corrosion resistance, and water vapor resistance. This extends the service life and significantly reduces formaldehyde emissions, minimizing environmental pollution.

[0072] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A formaldehyde-free printed decorative paper, characterized in that: It includes printing base paper and a resin protective layer coated on the surface of the printing base paper. The resin protective layer is made of a protective layer dipping adhesive, and the protective layer dipping adhesive includes the following raw materials in parts by weight: 50 - 60 parts of acrylic emulsion, 12 - 18 parts of modified epoxy acrylate, 6 - 10 parts of silicone resin, 8 - 12 parts of filler, 6 - 10 parts of polyvinyl alcohol, 3 - 6 parts of polyethylene glycol, 3 - 6 parts of silane coupling agent, 2 - 4 parts of curing agent, and 12 - 18 parts of deionized water.

2. The formaldehyde-free printed decorative paper according to claim 1, characterized in that: The filler is at least one of nano calcium carbonate, nano silicon dioxide, and nano zinc oxide.

3. The weather-resistant decorative paper according to claim 2, wherein: The silane coupling agent is at least one of γ - aminopropyltriethoxysilane, γ - glycidyletheroxypropyltrimethoxysilane, and γ(vinyltris(β - methoxyethoxy)silane).

4. The formaldehyde-free printed decorative paper according to claim 1, wherein: The preparation method of each part of the modified epoxy acrylate includes the following steps: A1. By weight, take 35 - 45 parts of propylene glycol methyl ether and 1 - 1.5 parts of oleic acid, mix them evenly, then add 6 - 9 parts of tetrabutyl titanate, heat to 72 - 78 °C, keep warm for 2 - 3 h and then filter by suction. Wash the obtained precipitate with deionized water and dry it, then add 30 - 35 parts of deionized water and 10 - 14 parts of triphosphate to obtain mixture A. A2. Heat mixture A to 85 - 95 °C under nitrogen protection, then add 30 - 34 parts of bisphenol A epoxy resin, 0.5 - 1.5 parts of catalyst, 0.2 - 0.4 parts of inhibitor, and drop - wise add 6 - 9 parts of acrylic acid, 4 - 7 parts of methyl methacrylate, and 4 - 7 parts of styrene, stir evenly, raise the temperature to 105 - 115 °C, carry out a constant - temperature reaction. When the acid value drops below 3 mg KOH / g, cool down to obtain the modified epoxy acrylate.

5. The formaldehyde-free printed decorative paper according to claim 4, characterized in that: In step A2, the catalyst is at least one of tetraethylammonium bromide, tetrabutylammonium bromide, triethylamine, N,N - dimethylbenzylamine, trimethylbenzylammonium chloride, and triphenylphosphine.

6. The formaldehyde-free printed decorative paper according to claim 4, characterized in that: In step A2, the inhibitor is at least one of p - methoxyphenol, hydroquinone, and 2,5 - dimethylhydroquinone.

7. The formaldehyde-free printed decorative paper according to claim 1, wherein: The curing agent is at least one of triethylenetetramine, triethylamine, and N - hydroxymethylacrylamide.

8. A method for preparing the formaldehyde-free printed decorative paper according to any one of claims 1-7, characterized in that, It includes the following steps: Dip the printing base paper in the protective layer dipping adhesive, dry it to form a resin protective layer, and obtain the formaldehyde - free printed decorative paper.

9. A veneered artificial board, characterized in that: It includes a board body and the formaldehyde - free printed decorative paper according to any one of claims 1 - 7, and the formaldehyde - free printed decorative paper is adhered to the surface of the board body.

10. A method for preparing the veneered artificial board as described in claim 9, characterized in that: The preparation method of the veneered wood - based panel includes the following steps: Thermally press the formaldehyde - free printed decorative paper onto the surface of the board body to obtain the veneered wood - based panel.

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