Glue for decorative paper, decorative paper, veneered artificial board and preparation method thereof

Abstract

The present invention relates to the field of wood-based panel technology, it is a kind of decorative paper glue, decorative paper, facing wood-based panel and preparation method thereof, comprise the following steps: S1: prepare graphene oxide micropowder;S2: prepare amino modified graphene oxide:Aminosilane coupling agent and graphene oxide micropowder are mixed in deionized water, ultrasound, stirring, pH is adjusted to 4 5 with acidic solution, carry out water bath reaction, then cool to room temperature, pH is adjusted to 7 10 with alkaline solution, filter and wash to remove unreacted aminosilane coupling agent, freeze drying is stand-by;S3: prepare impregnation glue;S4: add amino modified graphene oxide to the impregnation glue prepared.The present invention has that preparation technology is simple, preparation cost is low, there is the advantage of great industrialization promotion value, in addition by selecting graphene oxide micropowder, and it is carried out amino modification, greatly improve the dispersibility of graphene material in impregnation glue.

Description

Technical Field

[0001] The invention relates to the technical field of artificial boards, and specifically relates to glue for decorative paper, decorative paper, a veneered artificial board and a preparation method thereof. Background Art

[0002] Decorative paper, also known as impregnated film paper, has become the most widely used finishing material for interior decorative panels in recent years. It is essentially a film-like paper made by impregnating patterned paper with a synthetic resin through specialized equipment and drying it. This film-like paper is then pressed onto the surface of artificial panels under high temperature and high pressure to create the decorative panel. This type of decorative panel has gradually become a staple in interior decoration due to its strong sense of solid wood and the ability to eliminate the need for paint. However, as people's expectations for indoor living quality increase, so too do the demands for decorative panels, such as those with antibacterial, negative ion, and far-infrared properties.

[0003] To achieve the various functions of decorative panels, it is often necessary to start with impregnated paper. For impregnated paper, the most important component affecting its performance and surface effects is the impregnating glue. Differences in the curing speed, curing degree, transparency, and bonding strength of the impregnating glue will significantly affect the performance of the impregnated paper. Therefore, the functionality of impregnated paper is generally given by functional modification of the impregnating glue. Currently, melamine resin adhesives or melamine-modified urea-formaldehyde resin adhesives are the most commonly used synthetic resin adhesives in the production of impregnated paper. Traditional functional modification often involves adding a certain amount of functional additives to the impregnating glue. However, most functional additives have the disadvantages of single functionality, large effective addition amounts, which lead to excessively high costs, and also affect various performance indicators of the impregnating glue (curing speed, transparency, etc.), making functional additives unable to be applied on a large scale.

[0004] For example, Chinese patent document CN112359646A discloses a method for preparing anti-Klebsiella pneumoniae impregnated decorative paper, which comprises the following steps: A1, primary impregnation: impregnating both sides of the decorative paper in urea-formaldehyde resin glue, drying to obtain primary impregnated decorative paper, controlling the total glue amount of the primary impregnation to be 40-45%, and the gluing temperature to be 90-110°C; A2, secondary impregnation: impregnating both sides of the primary impregnated decorative paper in secondary impregnation glue to obtain secondary impregnated decorative paper, controlling the total glue amount of the primary impregnation to be 40-45%, and the gluing temperature to be 90-110°C; The total amount of glue applied in the secondary dipping is 55-60%, and the gluing temperature is 90-110°C. The amount of glue applied on the upper surface of the primary dipping decorative paper accounts for 58-62% of the total amount of glue applied, and the amount of glue applied on the lower surface of the primary dipping decorative paper accounts for 38-42% of the total amount of glue applied. The preparation process of the secondary dipping glue in step A2 comprises the following steps: A21, adding nano titanium oxide to 40-44°C melamine glue, stirring evenly, and then cooling to 18-23°C, controlling the amount of nano titanium oxide added to make the secondary dipping glue The content of nano-titanium oxide in the glue of the dipping is 0.45-0.55% by mass; A22, add nano-zinc oxide to the 18-23°C glue obtained in step A21, stir evenly and then heat to 33-38°C, control the amount of nano-zinc oxide added so that the content of nano-zinc oxide in the glue of the secondary dipping is 0.25-0.35% by mass; A23, add nano-copper sulfate to the 33-38°C glue obtained in step A22, stir evenly, control the amount of nano-copper sulfate added so that the secondary The content of nano-copper sulfate in the upper glue of the dipping process is 0.04-0.06% by mass. A24: Add nano-silver oxide to the 33-38°C glue obtained in step A23, stir evenly, and control the amount of nano-silver oxide added so that the content of nano-silver oxide in the upper glue of the secondary dipping process is 0.04-0.06% by mass. The mixture is then cooled to 20-30°C to obtain a secondary dipping glue. A3: Pre-curing: Pre-curing the secondary dipping decorative paper obtained in step A2 by 48-52% to obtain impregnated decorative paper A. In this patent, due to the poor dispersibility of the added nanomaterial in the dipping glue, the resulting decorative paper not only has poor antibacterial, antiviral, and mildew-proof properties, but also has an unsightly appearance and poor transparency.

[0005] The Chinese patent document with publication number CN114318948A discloses a method for preparing antibacterial impregnated paper, comprising: S1, providing a paper body; S2, providing an antibacterial mixed glue of melamine formaldehyde resin glue and nano-magnesium-based active factor antibacterial material, and performing antibacterial impregnation on the paper body; wherein the mass percentage of the nano-magnesium-based active factor antibacterial material and the melamine formaldehyde resin glue is 0.5-1%; S3, drying and cooling at 120-150°C to obtain the antibacterial impregnated paper; wherein the preparation method of the nano-magnesium-based active factor antibacterial material comprises the steps of: S10, providing a heavy magnesium aqueous solution; the concentration of magnesium bicarbonate in the heavy magnesium aqueous solution is 20-60g / L; S20, in the heavy magnesium aqueous solution An active modifier and a dispersant are added to obtain a mixed solution; the active modifier is one or more of aluminum nitrate, calcium nitrate, lanthanum nitrate, cerium nitrate, cerium acetate, and lanthanum acetate; the amount of the active modifier added is 0.5-5% by mass of the heavy magnesium aqueous solution; the dispersant is one or more of polyacrylamide, cellulose derivatives, and sodium silicate; the amount of the dispersant added is 0.1-2% by mass of the heavy magnesium aqueous solution; S30, the mixed solution is atomized and flash-dried to obtain a composite powder material; S40, the composite powder material is calcined, and the calcined product is ground to obtain the nano-magnesium-based active factor antibacterial material, the particle size of the nano-magnesium-based active factor antibacterial material being less than 50 nanometers. Similarly, the poor dispersibility of the nano-magnesium material in this patent leads to unsatisfactory antibacterial properties of the impregnated paper.

[0006] Furthermore, with the increasing research on graphene in recent years, graphene has been widely applied in new composite materials across various fields due to its excellent optical, electrical, and mechanical properties, as well as good biostatic and chemical stability. Well-dispersed few-layer or single-layer graphene materials, in particular, offer excellent visible light transmittance, excellent biostatic (antibacterial) properties, low-temperature far-infrared emission, negative ion release, and chemical stability, making them particularly suitable for use in interior decoration materials. However, simply adding graphene to the impregnating glue for decorative paper not only severely affects the appearance of the decorative paper due to its poor dispersion, but also causes the graphene to aggregate and fail to exhibit the excellent properties of few-layer or single-layer graphene. Therefore, addressing the dispersibility of graphene in the impregnating glue is of vital importance for the application of graphene materials in decorative paper. Summary of the Invention

[0007] The present invention provides a glue for decorative paper, decorative paper, a veneered artificial board and a preparation method thereof, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem of poor dispersibility of existing graphene materials in impregnated glue.

[0008] One of the technical solutions of the present invention is achieved by the following measures: a glue for decorative paper is obtained by the following steps:

[0009] S1: preparing graphene oxide powder;

[0010] S2: Preparation of amino-modified graphene oxide: aminosilane coupling agent and graphene oxide powder were mixed uniformly in deionized water, sonicated, stirred, and the pH was adjusted to 4-5 with an acidic solution. The mixture was reacted in a water bath, then cooled to room temperature, and then the pH was adjusted to 7-10 with an alkaline solution. The mixture was filtered and washed to remove unreacted aminosilane coupling agent, and freeze-dried for later use;

[0011] S3: preparing impregnation glue: adding a curing agent, a toughening agent, β-carboxyethyl acrylate, and a defoaming agent to a melamine formaldehyde resin glue, stirring evenly, adding a dispersant, and then adding an alkali solution to adjust the pH value to 7.5-10;

[0012] S4: adding amino-modified graphene oxide to the prepared impregnation glue, dispersing it at high speed to make it evenly dispersed, and preparing glue for decorative paper.

[0013] The second technical solution of the present invention is achieved by the following measures: a method for preparing glue for decorative paper, comprising the following steps:

[0014] S1: preparing graphene oxide powder;

[0015] S2: Preparation of amino-modified graphene oxide: aminosilane coupling agent and graphene oxide powder were mixed uniformly in deionized water, sonicated, stirred, and the pH was adjusted to 4-5 with an acidic solution. The mixture was reacted in a water bath, then cooled to room temperature, and then the pH was adjusted to 7-10 with an alkaline solution. The mixture was filtered and washed to remove unreacted aminosilane coupling agent, and freeze-dried for later use;

[0016] S3: preparing impregnation glue: adding a curing agent, a toughening agent, β-carboxyethyl acrylate, and a defoaming agent to a melamine formaldehyde resin glue, stirring evenly, adding a dispersant, and then adding an alkali solution to adjust the pH value to 7.5-10;

[0017] S4: adding amino-modified graphene oxide to the prepared impregnation glue, dispersing it at high speed to make it evenly dispersed, and preparing glue for decorative paper.

[0018] The following is a further optimization and / or improvement of the second embodiment of the above invention:

[0019] In the above step S1, graphene oxide can be prepared by the Hummers method, the Brodie method or the Staudenmaier method, and then the graphene oxide is ground into graphene oxide powder with a particle size of 5-50 microns.

[0020] In the above step S2, ultrasonication can be performed for 30 minutes and stirring can be performed for 10 minutes; the reaction can be carried out in a water bath at 70° C. for 2 hours, the acidic solution can be a hydrochloric acid solution, and the alkaline solution can be a diethanolamine solution or a sodium hydroxide solution.

[0021] In the above step S3, the curing agent can be triethanolamine phthalate monoester, and the amount of the curing agent added is 0.3%-2.0% of the mass of the melamine formaldehyde resin glue; the toughening agent is ethyl carbamate latex, and the amount of the toughening agent added is 0.3%-2.0% of the mass of the melamine formaldehyde resin glue; the defoaming agent is the commercially available NS801 water-based system defoaming agent; the dispersant is an acrylic acid-styrene-maleic anhydride block copolymer dispersant; and the alkali solution is a 30% NaOH solution.

[0022] In the above step S4, the amount of amino-modified graphene oxide added can be 0.05%-0.1% of the mass of the impregnated glue, and the high-speed dispersion is dispersed by a high-speed disperser for 30 minutes.

[0023] The third technical solution of the present invention is achieved by the following measures: a decorative paper is obtained by the following steps:

[0024] Step 1: Use melamine modified urea-formaldehyde resin glue to impregnate the printed decorative paper, with the glue amount of 100-150g / m 2 , then pre-drying, the drying temperature is 70-110 ℃;

[0025] Step 2: Apply the decorative paper glue prepared by the above-mentioned decorative paper glue preparation method to the upper surface of the impregnated paper prepared by step 1, with a coating amount of 50-70g / m 2 ; In step 1, the lower surface of the impregnated paper is coated with melamine formaldehyde resin glue, the glue amount is 50-70g / m 2 ;

[0026] Step 3: Drying and pre-curing the decorative paper obtained in step 2 at a drying temperature of 80-130°C.

[0027] The fourth technical solution of the present invention is achieved by the following measures: A method for preparing decorative paper, comprising the following steps:

[0028] Step 1: Use melamine modified urea-formaldehyde resin glue to impregnate the printed decorative paper, with the glue amount of 100-150g / m 2 , then pre-drying, the drying temperature is 70-110 ℃;

[0029] Step 2: Apply the decorative paper glue prepared by the above-mentioned decorative paper glue preparation method to the upper surface of the impregnated paper prepared by step 1, with a coating amount of 50-70g / m 2 ; In step 1, the lower surface of the impregnated paper is coated with melamine formaldehyde resin glue, the glue amount is 50-70g / m 2 ;

[0030] Step 3: Drying and pre-curing the decorative paper obtained in step 2 at a drying temperature of 80-130°C.

[0031] The fifth technical solution of the present invention is achieved through the following measures: a veneered artificial board is obtained according to the following steps: using particleboard, plywood or density board as a substrate, and pressing the decorative paper prepared by the decorative paper preparation method described in the fourth technical solution on the surface of the substrate.

[0032] The sixth technical solution of the present invention is achieved through the following measures: a method for preparing an artificially veneered board, comprising the following steps: using particleboard, plywood or density board as a substrate, and pressing the decorative paper prepared by the decorative paper preparation method described in the fourth technical solution above on the surface of the substrate.

[0033] Compared with the prior art, the present invention has the following significant advantages and beneficial effects:

[0034] (1) The preparation process is simple, the preparation cost is low, and it has great industrial promotion value;

[0035] (2) By selecting graphene oxide micropowder and performing amino modification on it, the dispersion of graphene material in the impregnation glue is greatly improved, so that a small amount of graphene oxide can be added to ensure that the glue has multiple functionalities while minimizing the impact on the transparency of the glue;

[0036] (3) During the preparation process, the pH value of the impregnating glue is adjusted to a weak alkaline state. The amino-modified graphene oxide can be stably dispersed for a long time in an aqueous solution under a weak alkaline environment, which not only prolongs the storage time of the impregnating glue and the impregnated paper, but also the amino-modified graphene oxide with a better dispersion degree can exist in the impregnating glue in the form of a few layers or a single layer;

[0037] (4) The dispersibility of graphene oxide in triamine glue was further improved by adding acrylic acid-styrene-maleic anhydride block copolymer water-soluble dispersant. DETAILED DESCRIPTION

[0038] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0039] The present invention will be further described below in conjunction with the embodiments:

[0040] Example 1: The glue for decorative paper and the preparation method thereof include the following steps:

[0041] S1: preparing graphene oxide powder;

[0042] S2: Preparation of amino-modified graphene oxide: aminosilane coupling agent and graphene oxide powder were mixed uniformly in deionized water, sonicated, stirred, and the pH was adjusted to 4-5 with an acidic solution. The mixture was reacted in a water bath, then cooled to room temperature, and then the pH was adjusted to 7-10 with an alkaline solution. The mixture was filtered and washed to remove unreacted aminosilane coupling agent, and freeze-dried for later use;

[0043] S3: preparing impregnation glue: adding a curing agent, a toughening agent, β-carboxyethyl acrylate, and a defoaming agent to a melamine formaldehyde resin glue, stirring evenly, adding a dispersant, and then adding an alkali solution to adjust the pH value to 7.5-10;

[0044] S4: adding amino-modified graphene oxide to the prepared impregnation glue, dispersing it at high speed to make it evenly dispersed, and preparing glue for decorative paper.

[0045] Specifically, in step S1, graphene oxide is prepared by a Hummers method, a Brodie method, or a Staudenmaier method, and then the graphene oxide is ground into graphene oxide powder with a particle size of 5-50 microns.

[0046] Specifically, in step S2, ultrasonication is performed for 30 minutes, and stirring is performed for 10 minutes; and a water bath reaction is performed at 70° C. for 2 hours. The acidic solution is a hydrochloric acid solution, and the alkaline solution is a diethanolamine solution or a sodium hydroxide solution.

[0047] Specifically, in step S3, the curing agent can be triethanolamine phthalate, and the amount of the curing agent added is 0.3%-2.0% of the mass of the melamine formaldehyde resin glue; the toughening agent is ethyl carbamate latex, and the amount of the toughening agent added is 0.3%-2.0% of the mass of the melamine formaldehyde resin glue; the defoaming agent is the commercially available NS801 water-based system defoaming agent; the dispersant is an acrylic acid-styrene-maleic anhydride block copolymer dispersant; and the alkali solution is a 30% NaOH solution.

[0048] Specifically, in step S4, the amount of amino-modified graphene oxide added can be 0.05%-0.1% of the mass of the impregnated glue, and the high-speed dispersion is dispersed for 30 minutes using a high-speed disperser.

[0049] Although graphene itself has excellent properties, it is not suitable for use in water-based melamine resin adhesives due to its complex preparation process, high cost and poor dispersibility in aqueous solvents. In this application, a graphene derivative, graphene oxide, is selected and amino-modified. Compared with graphene, graphene oxide (GO) is easier to prepare and is suitable for large-scale industrial production, which greatly reduces production costs. In addition, the surface of graphene oxide has more hydrophilic groups and can be better dispersed in aqueous solutions. On this basis, the graphene oxide powder is further modified by an aminosilane coupling agent, which further improves the interfacial compatibility between graphene oxide and triamine resin, making it have better dispersibility in melamine resin adhesives, thereby ensuring excellent light transmittance, bioinhibition, low-temperature far-infrared emission, negative ion release function and other properties. In this application, the pH value of the impregnating glue is adjusted to a weak alkaline state. The amino-modified graphene oxide can be stably dispersed for a long time in an aqueous solution under a weak alkaline environment, extending the storage time of the impregnating glue and impregnated paper. In addition, the amino-modified graphene oxide with a better dispersion degree can be present in the impregnating glue in a few layers or a single layer form. Therefore, with a small amount of graphene added, the material can have multiple functionalities such as bioinhibition, low-temperature far-infrared emission, and negative ion release function, while maintaining the transparency of the surface adhesive layer. In addition, the addition of an acrylic acid-styrene-maleic anhydride block copolymer water-soluble dispersant further improves the dispersibility of graphene oxide in triamine glue, ensuring that the functionality of graphene is displayed in the glue.

[0050] The method for preparing the glue for decorative paper disclosed in the present invention has a simple preparation process, low preparation cost and high production efficiency, and can effectively solve the problem that existing graphene materials are difficult to disperse in water-based adhesive systems. By selecting amino-modified graphene oxide, regulating the pH value of the water-based adhesive system and adding a special water-based dispersant, a small amount of graphene oxide is added while ensuring that the impregnating glue has multiple functionalities and having little effect on the transparency of the glue.

[0051] Specifically, in this embodiment, in step S2, the pH is adjusted to 4 with an acidic solution and the pH is adjusted to 7 with an alkaline solution; in step S3, alkaline solution is added to adjust the pH value to 7.5, the amount of curing agent added is 0.3% of the mass of the melamine formaldehyde resin glue, and the amount of toughening agent added is 0.3% of the mass of the melamine formaldehyde resin glue; in step S4, the amount of amino-modified graphene oxide added can be 0.05% of the mass of the impregnated glue.

[0052] Example 2: The only difference between this example and Example 1 is that: in step S2, the pH is adjusted to 5 with an acidic solution and the pH is adjusted to 10 with an alkaline solution; in step S3, alkaline solution is added to adjust the pH value to 10, the amount of curing agent added is 2.0% of the mass of the melamine formaldehyde resin glue, and the amount of toughening agent added is 2.0% of the mass of the melamine formaldehyde resin glue; in step S4, the amount of amino-modified graphene oxide added can be 0.1% of the mass of the impregnating glue.

[0053] Example 3: The decorative paper and its preparation method include the following steps:

[0054] Step 1: Use melamine modified urea-formaldehyde resin glue to impregnate the printed decorative paper, with the glue amount of 100-150g / m 2 , then pre-drying, the drying temperature is 70-110 ℃;

[0055] Step 2: Apply glue to the upper surface of the impregnated paper prepared in step 1 using the decorative paper prepared in Example 1. The amount of glue applied is 50-70 g / m 2 ; In step 1, the lower surface of the impregnated paper is coated with melamine formaldehyde resin glue, the glue amount is 50-70g / m 2 ;

[0056] Step 3: Drying and pre-curing the decorative paper obtained in step 2 at a drying temperature of 80-130°C.

[0057] The decorative paper prepared in this application not only has multiple functionalities such as biological inhibition, low-temperature far-infrared emission, and negative ion release, but also maintains the transparency of the surface adhesive layer. In addition, the manufacturing cost is low, and it has very great industrial promotion value.

[0058] Specifically, in this embodiment, in step 1, the glue amount is 100g / m 2 , the drying temperature is 70 ℃; in step 2, the decorative paper prepared in Example 1 is coated on the upper surface of the impregnated paper prepared in step 1 with glue, and the amount of glue applied is 50g / m 2 ; In step 1, the lower surface of the impregnated paper is coated with melamine formaldehyde resin glue, the glue amount is 50g / m 2 ; In step three, the drying temperature is 80°C.

[0059] Example 4: The difference between this example and Example 3 is that in step 1, the amount of glue applied is 150g / m 2 , the drying temperature is 110 ℃; in step 2, the decorative paper prepared in Example 1 is coated on the upper surface of the impregnated paper prepared in step 1 with glue, and the amount of glue applied is 70g / m 2; In step 1, the lower surface of the impregnated paper is coated with melamine formaldehyde resin glue, the glue amount is 70g / m 2 ; In step three, the drying temperature is 130°C.

[0060] Example 5: This veneered artificial board and its preparation method comprise the following steps: using particleboard, plywood, or density fiberboard as a substrate, and applying decorative paper produced using the above-described decorative paper preparation method to the substrate's surface. The resulting decorative board not only looks identical to conventional decorative board but also exhibits biocidal properties, low-temperature far-infrared emission, and negative ion release. This low-cost manufacturing method offers significant potential for industrialization and promotion. Specifically, in this example, a 3mm density fiberboard substrate is used, with the decorative paper applied to one side of the substrate.

[0061] Comparative Example 1: The only difference between this comparative example and Example 5 is that commercially available ordinary impregnated adhesive decorative paper is pressed onto one side of the substrate.

[0062] Comparative Example 2: This comparative example differs from Example 5 only in that the graphene oxide powder is directly added to the impregnating glue without being modified by amino.

[0063] The performance of the products prepared in Example 5, Comparative Example 1, and Comparative Example 2 were tested, wherein the antibacterial property was tested according to the detection method specified in the industry standard JC / T 2039-2010, the far-infrared emissivity was tested according to the detection method specified in the industry standard GB / T 7287-2008, and the negative ion release was tested according to the detection method specified in the industry standard LY / T 3235-2020. The specific results are shown in Table 1.

[0064] Table 1

[0065] Appearance Antibacterial rate Far infrared emissivity Negative ion release (per cm³) Example 5 The pattern is clear and there is no mottled spots 99% 89% 650 Comparative Example 1 The pattern is clear and there is no mottled spots 56% 70% 0 Comparative Example 2 Dark color with black spots 79% 82% 360

[0066] The above technical features respectively constitute the best embodiments of the present invention, which have strong adaptability and best implementation effects. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A glue for decorative paper, characterized in that Follow these steps to get it: S1: preparing graphene oxide powder; S2: Preparation of amino-modified graphene oxide: aminosilane coupling agent and graphene oxide powder were mixed uniformly in deionized water, sonicated, stirred, and the pH was adjusted to 4-5 with an acidic solution. The mixture was reacted in a water bath, then cooled to room temperature, and then the pH was adjusted to 7-10 with an alkaline solution. The mixture was filtered and washed to remove unreacted aminosilane coupling agent, and freeze-dried for later use; S3: preparing impregnation glue: adding a curing agent, a toughening agent, β-carboxyethyl acrylate, and a defoaming agent to a melamine formaldehyde resin glue, stirring evenly, adding a dispersant thereto, and then adding an alkali solution to adjust the pH value to 7.5-10, wherein the curing agent is triethanolamine phthalate monoester, the toughening agent is ethyl carbamate latex, and the dispersant is an acrylic acid-styrene-maleic anhydride block copolymer dispersant; S4: adding amino-modified graphene oxide to the prepared impregnation glue, dispersing it at high speed to make it evenly dispersed, and preparing glue for decorative paper.

2. A method for preparing the glue for decorative paper according to claim 1, characterized in that The following steps are involved: S1: preparing graphene oxide powder; S2: Preparation of amino-modified graphene oxide: aminosilane coupling agent and graphene oxide powder were mixed uniformly in deionized water, sonicated, stirred, and the pH was adjusted to 4-5 with an acidic solution. The mixture was reacted in a water bath, then cooled to room temperature, and then the pH was adjusted to 7-10 with an alkaline solution. The mixture was filtered and washed to remove unreacted aminosilane coupling agent, and freeze-dried for later use; S3: preparing impregnation glue: adding a curing agent, a toughening agent, β-carboxyethyl acrylate, and a defoaming agent to a melamine formaldehyde resin glue, stirring evenly, adding a dispersant thereto, and then adding an alkali solution to adjust the pH value to 7.5-10, wherein the curing agent is triethanolamine phthalate monoester, the toughening agent is ethyl carbamate latex, and the dispersant is an acrylic acid-styrene-maleic anhydride block copolymer dispersant; S4: adding amino-modified graphene oxide to the prepared impregnation glue, dispersing it at high speed to make it evenly dispersed, and preparing glue for decorative paper.

3. The method for preparing the glue for decorative paper according to claim 2, characterized in that In step S1, graphene oxide is prepared by a Hummers method, a Brodie method, or a Staudenmaier method, and then the graphene oxide is ground into graphene oxide powder with a particle size of 5-50 microns.

4. The method for preparing the glue for decorative paper according to claim 2 or 3, characterized in that In step S2, ultrasonication is performed for 30 minutes and stirring is performed for 10 minutes; the reaction is carried out in a water bath at 70° C. for 2 hours. The acidic solution is a hydrochloric acid solution, and the alkaline solution is a diethanolamine solution or a sodium hydroxide solution.

5. The method for preparing the glue for decorative paper according to claim 2 or 3, characterized in that In step S3, the amount of curing agent added is 0.3%-2.0% of the mass of melamine formaldehyde resin glue; the amount of toughening agent added is 0.3%-2.0% of the mass of melamine formaldehyde resin glue; the defoaming agent is the commercially available NS801 water-based system defoaming agent; and the alkali solution is 30% NaOH solution.

6. The method for preparing the glue for decorative paper according to claim 4, characterized in that In step S3, the amount of curing agent added is 0.3%-2.0% of the mass of melamine formaldehyde resin glue; the amount of toughening agent added is 0.3%-2.0% of the mass of melamine formaldehyde resin glue; the defoaming agent is the commercially available NS801 water-based system defoaming agent; and the alkali solution is 30% NaOH solution.

7. The method for preparing the glue for decorative paper according to claim 2 or 3, characterized in that In step S4, the amount of amino-modified graphene oxide added is 0.05%-0.1% of the mass of the impregnated glue, and the high-speed dispersion is performed by using a high-speed disperser for 30 minutes.

8. The method for preparing the glue for decorative paper according to claim 4, characterized in that In step S4, the amount of amino-modified graphene oxide added is 0.05%-0.1% of the mass of the impregnated glue, and the high-speed dispersion is performed by using a high-speed disperser for 30 minutes.

9. The method for preparing the glue for decorative paper according to claim 5, characterized in that In step S4, the amount of amino-modified graphene oxide added is 0.05%-0.1% of the mass of the impregnated glue, and the high-speed dispersion is performed by using a high-speed disperser for 30 minutes.

10. A decorative paper, characterized in that Follow these steps to get it: Step 1: Use melamine modified urea-formaldehyde resin glue to impregnate the printed decorative paper, with the glue amount of 100-150g / m 2 , then pre-drying, the drying temperature is 70-110 ℃; Step 2: Apply the glue for decorative paper prepared by the method for preparing glue for decorative paper according to any one of claims 2 to 9 onto the upper surface of the impregnated paper prepared in step 1, with a coating amount of 50-70 g / m 2 ; In step 1, the lower surface of the impregnated paper is coated with melamine formaldehyde resin glue, the glue amount is 50-70g / m 2 ; Step 3: Drying and pre-curing the decorative paper obtained in step 2 at a drying temperature of 80-130°C.

11. A method for preparing decorative paper, characterized in that The following steps are involved: Step 1: Use melamine modified urea-formaldehyde resin glue to impregnate the printed decorative paper, with the glue amount of 100-150g / m 2 , then pre-drying, the drying temperature is 70-110 ℃; Step 2: Apply the glue for decorative paper prepared by the method for preparing glue for decorative paper according to any one of claims 2 to 10 onto the upper surface of the impregnated paper prepared in step 1, with a coating amount of 50-70 g / m 2 ; In step 1, the lower surface of the impregnated paper is coated with melamine formaldehyde resin glue, the glue amount is 50-70g / m 2 ; Step 3: Drying and pre-curing the decorative paper obtained in step 2 at a drying temperature of 80-130°C.

12. A veneer artificial board, characterized in that The method is prepared by the following steps: using particleboard, plywood or density board as a substrate, and pressing the decorative paper prepared by the decorative paper preparation method according to claim 11 on the surface of the substrate.

13. A method for preparing a veneer artificial board, characterized in that The following steps are involved: A particleboard, plywood or density board is used as a substrate, and the decorative paper prepared by the decorative paper preparation method according to claim 11 is pressed on the surface of the substrate.