Wood-based panel surface decorative paper and preparation method therefor

Abstract

The present invention relates to the technical field of decorative paper, and in particular to wood-based panel surface decorative paper, comprising print base paper and an adhesive film layer covering the surface of the print base paper. The adhesive film layer is made of impregnation glue liquid. The impregnation glue liquid comprises the following raw materials in parts by weight: 75-85 parts of modified polyurethane emulsion, 5-9 parts of an epoxy resin, 6-10 parts of a filler, 4-7 parts of nanocellulose, 2-3 parts of a silane coupling agent, 1.5-2.5 parts of a film-forming auxiliary agent, 0.2-0.3 parts of a defoaming agent, and 20-30 parts of water. The wood-based panel surface decorative paper comprises print base paper and an adhesive film layer covering the surface of the print base paper; the adhesion between the adhesive film layer and the print base paper is good; and the wood-based panel surface decorative paper has good wear resistance, good water vapor resistance, good cold and hot cycle resistance, and other properties, can reduce formaldehyde emission and is environmentally friendly.

Description

Artificial board veneer decorative paper and preparation method thereof Technical Field

[0001] The present invention relates to the technical field of decorative paper, in particular to a decorative paper for artificial board veneer, a preparation method thereof and a veneer artificial board. Background Art

[0002] Currently, veneered wood-based panels have been widely used in interior decoration, furniture, and other fields. Decorative paper is an important veneer material for wood-based panels, protecting and beautifying them. However, the existing impregnation treatment of decorative paper mostly uses aldehyde adhesives such as urea-formaldehyde resin and melamine-formaldehyde resin to give the paper good hardness, adhesion, acid and alkali resistance, etc. However, these adhesives release free formaldehyde during the production and use of decorative paper. Formaldehyde is easily volatile when heated and can cause harm to the health of practitioners during the hot pressing process. Currently, with the progress of society and the improvement of people's environmental awareness, the environmental performance of home wood products is receiving more and more attention. The environmental friendliness and formaldehyde-free nature of decorative paper are of great significance to the environmental performance of wood-based panels and human health. Therefore, the development of formaldehyde-free veneer decorative paper with good physical properties such as wear resistance, scratch resistance, and good adhesion has become an urgent problem to be solved in the home wood products and related industries.

[0003] Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide an environmentally friendly artificial board facing decorative paper, which has good wear resistance, water vapor resistance, and resistance to cold and hot cycles, and can reduce the release of formaldehyde, and is environmentally friendly.

[0005] Another object of the present invention is to provide a method for preparing artificial board veneer decorative paper, which has high production efficiency, low production cost, convenient operation, and is convenient for large-scale production.

[0006] The object of the present invention is achieved through the following technical solution: a decorative paper for artificial board veneer, comprising a printing base paper and a film layer coated on the surface of the printing base paper, wherein the film layer is made of an impregnating glue solution, and the impregnating glue solution comprises the following raw materials in parts by weight: 75-85 parts of modified polyurethane emulsion, 5-9 parts of epoxy resin, 6-10 parts of filler, 4-7 parts of nanocellulose, 2-3 parts of silane coupling agent, 1.5-2.5 parts of film-forming aid, 0.2-0.3 parts of defoaming agent, and 20-30 parts of water.

[0007] The purpose of the present invention is achieved through the following technical solution: A method for preparing decorative paper for artificial board veneer, comprising the following steps:

[0008] (1) Weighing the raw materials for the impregnation glue solution, the raw materials include the following components in parts by weight: 75-85 parts of modified polyurethane emulsion, 5-9 parts of epoxy resin, 6-10 parts of filler, 4-7 parts of nanocellulose, 2-3 parts of silane coupling agent, 1.5-2.5 parts of film-forming aid, 0.2-0.3 parts of defoaming agent, and 20-30 parts of water;

[0009] (2) uniformly mixing a modified polyurethane emulsion, an epoxy resin, a silane coupling agent, a filler, and water, heating and stirring, and then adding nanocellulose, a film-forming aid, and a defoaming agent, and stirring to obtain an impregnation glue solution;

[0010] (3) placing the printing base paper in the impregnation glue solution, completely impregnating it, and then drying it to obtain the artificial board facing decorative paper.

[0011] The inventors discovered that impregnating adhesives prepared by combining prior art polyurethane emulsions with other raw materials, such as fillers and film-forming agents, suffer from poor wear resistance, water vapor resistance, and mechanical properties when applied to decorative paper. However, by mixing the polyurethane emulsion with an epoxy resin, adding a silane coupling agent, and optimizing the ratio, the resulting impregnating adhesive exhibits improved adhesion and mechanical properties. However, when applied to decorative paper, the wear resistance and mechanical properties of the impregnating adhesive remain suboptimal. The inventors unexpectedly discovered that by modifying the polyurethane emulsion and combining it with raw materials, such as epoxy resin, fillers, nanocellulose, a silane coupling agent, and film-forming agents, the resulting impregnating adhesive effectively improves the wear resistance, water vapor resistance, and surface resistance to cold and hot cycling of decorative paper, while also exhibiting strong adhesion to printing paper.

[0012] Furthermore, the nanocellulose is Zhejiang Jinjiahao CNF-B, the epoxy resin is bisphenol A epoxy resin, and the bisphenol A epoxy resin is bisphenol A epoxy resin E42.

[0013] Furthermore, the preparation method of the modified polyurethane emulsion comprises the following steps:

[0014] S1, by weight, take 60-70 parts of aqueous polyurethane emulsion, add 0.1-0.2 parts of emulsifier and 0.1-0.3 parts of initiator, and stir for 20-40 minutes to obtain mixed solution A;

[0015] S2. Heat the mixed solution A to maintain 80-90° C., add 3-6 parts of diallyl phthalate, 2-4 parts of acrylic acid, and 2-4 parts of isobornyl acrylate while stirring, and keep the mixture at 75-80° C. for 90-150 min. Then, add 4-6 parts of amino-modified silicone and 3-5 parts of sodium hydroxyethyl cellulose, stir and keep the mixture warm for 90-150 min to obtain a modified polyurethane emulsion.

[0016] The present invention adopts the above raw materials and preparation method, and controls the process parameters of each step to prepare a modified polyurethane emulsion, and the modified polyurethane emulsion is added to the impregnating glue solution, which can achieve good coordination with raw materials such as epoxy resin, filler, nanocellulose, and silane coupling agent. The impregnating glue layer formed after the impregnating glue solution is cured has good adhesion to the printing base paper, which helps to improve the wear resistance, water vapor resistance, cold and hot cycle resistance, and crack resistance of the decorative paper, thereby extending the service life of the decorative paper.

[0017] Furthermore, in step S1, the initiator is one or more of potassium persulfate, sodium persulfate and ammonium persulfate.

[0018] Furthermore, in step S1, the emulsifier is one or more of sodium lauryl sulfate, sodium didodecylphenyl ether disulfonate, sodium alkylbenzene sulfonate, sodium dibutylnaphthalene sulfonate and sodium lignin sulfonate.

[0019] Furthermore, the filler is one or more of nano-alumina, nano-calcium carbonate and nano-silicon dioxide; and the particle size of the filler is 50-100 nm.

[0020] Furthermore, the film-forming aid is one or both of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

[0021] Furthermore, the silane coupling agent is one or more of vinyltrimethoxysilane, γ-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane.

[0022] Furthermore, the defoaming agent is one or more of an organosilicon defoaming agent and a polyether-modified silicone oil defoaming agent.

[0023] Furthermore, in the step (2), the modified polyurethane emulsion, epoxy resin, silane coupling agent, filler and water are mixed evenly, heated to 60-70° C., stirred for 20-40 minutes, and then nanocellulose, film-forming aid and defoaming agent are added and stirred for 20-40 minutes to obtain the impregnation glue solution.

[0024] Furthermore, in step (3), the printing base paper is placed in the impregnation glue solution and completely impregnated, and the impregnation amount is 150-200g / m 2 , drying at a temperature of 100-110°C to obtain artificial board veneer decorative paper.

[0025] The present invention provides the following beneficial effects: the wood-based panel veneer decorative paper comprises a printed base paper and a film layer coated on the surface of the printed base paper. The film layer exhibits excellent adhesion to the printed base paper, and the wood-based panel veneer decorative paper exhibits excellent wear resistance, water vapor resistance, and resistance to cold and hot cycles. Furthermore, the paper reduces formaldehyde release, resulting in environmental friendliness. The veneer decorative paper produced by the present invention, laminated to the wood-based panel veneer decorative paper, exhibits excellent decorative properties, is environmentally friendly, and has a long service life. DETAILED DESCRIPTION

[0026] To facilitate understanding by those skilled in the art, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0027] Example 1

[0028] In this embodiment, a method for preparing a decorative paper for artificial board veneer includes the following steps:

[0029] (1) Weighing the raw materials for the impregnation glue solution, the raw materials include the following components in parts by weight: 75-85 parts of modified polyurethane emulsion, 7 parts of epoxy resin, 8 parts of filler, 5 parts of nanocellulose, 2.5 parts of silane coupling agent, 12 parts of film-forming aid, and 25 parts of water;

[0030] (2) uniformly mixing a modified polyurethane emulsion, an epoxy resin, a silane coupling agent, a filler, and water, heating and stirring, and then adding nanocellulose, a film-forming aid, and a defoaming agent, and stirring to obtain an impregnation glue solution;

[0031] (3) placing the printing base paper in the impregnation glue solution, completely impregnating it, and then drying it to obtain the artificial board facing decorative paper.

[0032] Furthermore, the preparation method of the modified polyurethane emulsion comprises the following steps:

[0033] S1. Take 65 parts of aqueous polyurethane emulsion, add 0.15 parts of emulsifier and 0.2 parts of initiator, and stir for 30 minutes to obtain mixed solution A;

[0034] S2. Heat the mixed solution A to maintain 85°C, add 4 parts of diallyl phthalate, 3 parts of acrylic acid, and 3 parts of isobornyl acrylate while stirring, and keep the mixture at 78°C for 120 minutes. Then, add 5 parts of amino-modified silicone and 3.5 parts of sodium hydroxyethyl cellulose, stir and keep the mixture warm for 120 minutes to obtain a modified polyurethane emulsion.

[0035] Furthermore, in step S1, the initiator is potassium persulfate and the emulsifier is sodium lauryl sulfate.

[0036] Furthermore, the amino-modified silicone is KF-8015 amino-modified silicone, and the water-based polyurethane emulsion is Covestro water-based polyurethane Bayhydrol A2470.

[0037] Furthermore, the nanocellulose is CNF-B from Zhejiang Jinjiahao, and the epoxy resin is bisphenol A epoxy resin E42.

[0038] Furthermore, the film-forming aid is dipropylene glycol methyl ether. The silane coupling agent is composed of vinyl trimethoxy silane and γ-glycidyloxypropyl trimethoxy silane in a weight ratio of 1:1.

[0039] Furthermore, the defoaming agent is polyether modified silicone oil MSD-916.

[0040] Furthermore, the filler is composed of nano-alumina and nano-silicon dioxide in a weight ratio of 2:1; the particle size of the filler is 50-100nm.

[0041] Furthermore, in the step (2), the modified polyurethane emulsion, epoxy resin, silane coupling agent, filler and water are mixed evenly, heated to 65° C., stirred for 30 minutes, and then nanocellulose, film-forming aid and defoaming agent are added and stirred for 30 minutes to obtain the impregnation glue solution.

[0042] Furthermore, in step (3), the printing base paper is placed in the impregnation glue solution and completely impregnated, and the impregnation amount is 175g / m 2 , and dried at a temperature of 105°C to obtain artificial board veneer decorative paper.

[0043] Example 2

[0044] In this embodiment, a method for preparing a decorative paper for artificial board veneer includes the following steps:

[0045] (1) Weighing the raw materials for the impregnation glue solution, the raw materials include the following components in parts by weight: 85 parts of modified polyurethane emulsion, 6 parts of epoxy resin, 7 parts of filler, 5 parts of nanocellulose, 2.5 parts of silane coupling agent, 2.5 parts of film-forming aid, and 24 parts of water;

[0046] (2) uniformly mixing a modified polyurethane emulsion, an epoxy resin, a silane coupling agent, a filler, and water, heating and stirring, then adding nanocellulose, a film-forming aid, and a defoaming agent, and stirring to obtain an impregnation glue solution;

[0047] (3) placing the printing base paper in the impregnation glue solution, completely impregnating it, and then drying it to obtain the artificial board facing decorative paper.

[0048] Furthermore, the preparation method of the modified polyurethane emulsion comprises the following steps:

[0049] S1. Take 65 parts of aqueous polyurethane emulsion, add 0.15 parts of emulsifier and 0.15 parts of initiator, and stir for 30 minutes to obtain mixed solution A;

[0050] S2. Heat the mixed solution A to maintain 85°C, add 4 parts of diallyl phthalate, 2.5 parts of acrylic acid, and 3.5 parts of isobornyl acrylate while stirring, and keep the mixture at 80°C for 120 minutes. Then, add 5 parts of amino-modified silicone and 4 parts of sodium hydroxyethyl cellulose, stir and keep the mixture warm for 120 minutes to obtain a modified polyurethane emulsion.

[0051] Furthermore, in the step (2), the modified polyurethane emulsion, epoxy resin, silane coupling agent, filler and water are mixed evenly, heated to 65° C., stirred for 30 minutes, and then nanocellulose, film-forming aid and defoaming agent are added and stirred for 30 minutes to obtain the impregnation glue solution.

[0052] Furthermore, in step (3), the printing base paper is placed in the impregnation glue solution and completely impregnated, and the impregnation amount is 172g / m 2 , and dried at a temperature of 105°C to obtain artificial board veneer decorative paper.

[0053] The rest of this embodiment is the same as that of Example 1.

[0054] Example 3

[0055] In this embodiment, a method for preparing a decorative paper for artificial board veneer includes the following steps:

[0056] (1) Weighing the raw materials for the impregnation glue solution, the raw materials include the following components in parts by weight: 75 parts of modified polyurethane emulsion, 5 parts of epoxy resin, 6 parts of filler, 4 parts of nanocellulose, 2 parts of silane coupling agent, 1.5 parts of film-forming aid, and 20 parts of water;

[0057] (2) uniformly mixing a modified polyurethane emulsion, an epoxy resin, a silane coupling agent, a filler, and water, heating and stirring, then adding nanocellulose, a film-forming aid, and a defoaming agent, and stirring to obtain an impregnation glue solution;

[0058] (3) placing the printing base paper in the impregnation glue solution, completely impregnating it, and then drying it to obtain the artificial board facing decorative paper.

[0059] Furthermore, the preparation method of the modified polyurethane emulsion comprises the following steps:

[0060] S1. Take 60 parts of aqueous polyurethane emulsion, add 0.1 parts of emulsifier and 0.1 parts of initiator, and stir for 20 minutes to obtain mixed solution A;

[0061] S2. Heat the mixed solution A to maintain 80°C, add 3 parts of diallyl phthalate, 2 parts of acrylic acid, and 2 parts of isobornyl acrylate while stirring, and keep the mixture at 75°C for 150 minutes. Then, add 4 parts of amino-modified silicone and 3 parts of sodium hydroxyethyl cellulose, stir and keep the mixture warm for 90 minutes to obtain a modified polyurethane emulsion.

[0062] Furthermore, in step S1, the initiator is ammonium persulfate and the emulsifier is sodium alkylbenzene sulfonate.

[0063] Furthermore, the filler is composed of nano-alumina and nano-silicon dioxide in a weight ratio of 1:1.

[0064] Furthermore, the film-forming aid is dipropylene glycol butyl ether, the silane coupling agent is γ-aminopropyltriethoxysilane, and the defoaming agent is the organosilicon defoaming agent AFE-3168.

[0065] Furthermore, in the step (2), the modified polyurethane emulsion, epoxy resin, silane coupling agent, filler and water are mixed evenly, heated to 60° C., stirred for 40 minutes, and then nanocellulose, film-forming aid and defoaming agent are added and stirred for 40 minutes to obtain the impregnation glue solution.

[0066] Furthermore, in step (3), the printing base paper is placed in the impregnation glue solution and completely impregnated, and the impregnation amount is 168g / m 2 , and dried at a temperature of 100°C to obtain artificial board veneer decorative paper.

[0067] The rest of this embodiment is the same as that of Example 1.

[0068] Example 4

[0069] In this embodiment, a method for preparing a decorative paper for artificial board veneer includes the following steps:

[0070] (1) Weighing the raw materials for the impregnation glue solution, the raw materials include the following components in parts by weight: 85 parts of modified polyurethane emulsion, 9 parts of epoxy resin, 10 parts of filler, 7 parts of nanocellulose, 3 parts of silane coupling agent, 2.5 parts of film-forming aid, and 30 parts of water;

[0071] (2) uniformly mixing a modified polyurethane emulsion, an epoxy resin, a silane coupling agent, a filler, and water, heating and stirring, then adding nanocellulose, a film-forming aid, and a defoaming agent, and stirring to obtain an impregnation glue solution;

[0072] (3) placing the printing base paper in the impregnation glue solution, completely impregnating it, and then drying it to obtain the artificial board facing decorative paper.

[0073] Furthermore, the preparation method of the modified polyurethane emulsion comprises the following steps:

[0074] S1. Take 70 parts of aqueous polyurethane emulsion, add 0.2 parts of emulsifier and 0.1 parts of initiator, and stir for 20 minutes to obtain mixed solution A;

[0075] S2. Heat the mixed solution A to maintain 90°C, add 6 parts of diallyl phthalate, 4 parts of acrylic acid, and 4 parts of isobornyl acrylate while stirring, and keep the mixture at 80°C for 90 minutes. Then, add 6 parts of amino-modified silicone and 5 parts of sodium hydroxyethyl cellulose, stir and keep the mixture warm for 90 minutes to obtain a modified polyurethane emulsion.

[0076] Furthermore, in step S1, the initiator is sodium persulfate, the emulsifier is sodium lauryl sulfate and sodium didodecylphenyl ether disulfonate in a weight ratio of 1:3, and the filler is nano-alumina and nano-silicon dioxide in a weight ratio of 1:1.

[0077] Furthermore, the film-forming aid is dipropylene glycol butyl ether. The silane coupling agent is γ-glycidyloxypropyltrimethoxysilane.

[0078] Furthermore, in the step (2), the modified polyurethane emulsion, epoxy resin, silane coupling agent, filler and water are mixed evenly, heated to 70° C., stirred for 20 minutes, and then nanocellulose, film-forming aid and defoaming agent are added and stirred for 40 minutes to obtain the impregnation glue solution.

[0079] Furthermore, in the step (3), the printing base paper is placed in the impregnation glue solution for complete impregnation. Furthermore, in the step (2), the modified polyurethane emulsion, epoxy resin, silane coupling agent, filler and water are evenly mixed, heated to 65° C., stirred for 30 minutes, and then nanocellulose, film-forming aid and defoaming agent are added and stirred for 30 minutes to obtain the impregnation glue solution.

[0080] Furthermore, in step (3), the printing base paper is placed in the impregnation glue solution and completely impregnated, and the impregnation amount is 183g / m 2 , drying at a temperature of 105°C to obtain artificial board facing decorative paper, and drying at a temperature of 110°C to obtain artificial board facing decorative paper.

[0081] Comparative Example 1

[0082] The difference between this comparative example and Example 1 is that an equal amount of Covestro waterborne polyurethane Bayhydrol A2470 is used to replace the modified polyurethane emulsion in Example 1.

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 1 is that nanocellulose is not added in this comparative example.

[0085] Application Example 1

[0086] Take the decorative paper of Example 1 and Comparative Examples 1-2, and hot press the impregnated film paper on one side on the artificial board at a pressure of 4 MPa and a temperature of 165°C for 2 minutes. The artificial board is a fiberboard, and the printing base paper is a 70 g / m 2 Decorative paper is used to make a veneer artificial board, and the density of the veneer artificial board is 0.7-0.8g / cm 3 The amount of glue impregnation of the decorative paper of Example 1 and Comparative Examples 1-2 is 175±5g / m 3 .

[0087] The formaldehyde emission and glue content of the wood-based panel decorative paper were tested in accordance with GB / T 28995-2012, and the appearance quality of the wood-based panel decorative paper was observed. It can be seen that the wood-based panel decorative paper of Example 1 and Comparative Examples 1-2 had no surface damage, stains, or gaps. The product appearance quality all met the standards of GB / T 28995-2012, and the formaldehyde emission of the wood-based panel decorative paper was 0 mg / L.

[0088] According to GB / T15102-2017, the surface bonding strength, surface wear resistance, surface water vapor resistance, surface scratch resistance (≥1.5N surface without more than 90% scratches), surface crack resistance and surface resistance to cold and hot cycles of the veneered artificial board were tested respectively. The test results are shown in the following table:

[0089] As can be seen from the above table, the artificial board veneer decorative paper prepared by the present invention is applied to the veneer artificial board, which can make the veneer artificial board have excellent surface bonding strength, surface wear resistance, surface water vapor resistance, surface scratch resistance, surface crack resistance and surface resistance to cold and hot cycles, etc., and has a long service life. It can also reduce the release of formaldehyde, is friendly to the environment, and reduces damage to the human body.

[0090] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. A decorative paper for artificial board facing, characterized by: The invention comprises a printing base paper and a film layer coated on the surface of the printing base paper, wherein the film layer is made of an impregnated adhesive solution, and the impregnated adhesive solution comprises the following raw materials in parts by weight: 75-85 parts of modified polyurethane emulsion, 5-9 parts of epoxy resin, 6-10 parts of filler, 4-7 parts of nanocellulose, 2-3 parts of silane coupling agent, 1.5-2.5 parts of film-forming aid, 0.2-0.3 parts of defoaming agent, and 20-30 parts of water.

2. A method for preparing decorative paper for artificial board facing, characterized in that: The steps include: (1) Weighing the raw materials for the impregnation glue solution, the raw materials include the following components in parts by weight: 75-85 parts of modified polyurethane emulsion, 5-9 parts of epoxy resin, 6-10 parts of filler, 4-7 parts of nanocellulose, 2-3 parts of silane coupling agent, 1.5-2.5 parts of film-forming aid, 0.2-0.3 parts of defoaming agent, and 20-30 parts of water; (2) uniformly mixing a modified polyurethane emulsion, an epoxy resin, a silane coupling agent, a filler, and water, heating and stirring, and then adding nanocellulose, a film-forming aid, and a defoaming agent, and stirring to obtain an impregnation glue solution; (3) placing the printing base paper in the impregnation glue solution, completely impregnating it, and then drying it to obtain the artificial board facing decorative paper.

3. The method for preparing the artificial board facing decorative paper according to claim 2, characterized in that: The preparation method of the modified polyurethane emulsion comprises the following steps: S1, by weight, take 60-70 parts of aqueous polyurethane emulsion, add 0.1-0.2 parts of emulsifier and 0.1-0.3 parts of initiator, and stir for 20-40 minutes to obtain mixed solution A; S2. Heat the mixed solution A to maintain 80-90° C., add 3-6 parts of diallyl phthalate, 2-4 parts of acrylic acid, and 2-4 parts of isobornyl acrylate while stirring, and keep the mixture at 75-80° C. for 90-150 min. Then, add 4-6 parts of amino-modified silicone and 3-5 parts of sodium hydroxyethyl cellulose, stir and keep the mixture warm for 90-150 min to obtain a modified polyurethane emulsion.

4. The method for preparing the weather-resistant decorative paper according to claim 3, characterized in that: In step S1, the initiator is one or more of potassium persulfate, sodium persulfate and ammonium persulfate.

5. The method for preparing the weather-resistant decorative paper according to claim 3, characterized in that: In step S1, the emulsifier is one or more of sodium lauryl sulfate, sodium didodecylphenyl ether disulfonate, sodium alkylbenzene sulfonate, sodium dibutylnaphthalene sulfonate and sodium lignin sulfonate.

6. The method for preparing the artificial board facing decorative paper according to claim 2, characterized in that: The filler is one or more of nano-alumina, nano-calcium carbonate and nano-silicon dioxide.

7. The method for preparing the artificial board facing decorative paper according to claim 2, characterized in that: The film-forming aid is one or both of dipropylene glycol methyl ether and dipropylene glycol butyl ether.

8. The method for preparing the artificial board facing decorative paper according to claim 2, characterized in that: The silane coupling agent is one or more of vinyltrimethoxysilane, γ-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane.

9. The method for preparing the artificial board facing decorative paper according to claim 2, characterized in that: In the step (2), the modified polyurethane emulsion, epoxy resin, silane coupling agent, filler and water are mixed uniformly, heated to 60-70° C., stirred for 20-40 minutes, and then nanocellulose, film-forming aid and defoaming agent are added and stirred for 20-40 minutes to obtain the impregnation glue solution.

10. The method for preparing the artificial board facing decorative paper according to claim 2, characterized in that: In the step (3), the printing base paper is placed in the impregnation glue solution for complete impregnation, the impregnation amount is 150-200g / m2, and the base paper is dried at a temperature of 100-110°C to obtain the artificial board facing decorative paper.

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