A kind of artificial board and preparation method thereof

Abstract

The present invention provides a method for preparing an artificial board, which is carried out in sequence according to the following steps: (1) impregnating decorative paper in an impregnation liquid; (2) bonding the impregnated decorative paper obtained in step (1) to a substrate and rolling it; (3) spraying a stability coating on the decorative paper and performing a leveling treatment to obtain an intermediate piece; (4) sending the intermediate piece to an electron beam curing device for electron beam curing, so that the decorative paper is completely glued to the substrate, and the stability coating is cured; (5) coating a functional coating on the stability coating to obtain an intermediate piece coated with a functional coating; (6) sending the intermediate piece coated with the functional coating to an electron beam curing device for electron beam curing to obtain an artificial board product. The present invention also provides an artificial board prepared by the above method. Compared with the traditional process, the artificial board and the preparation method thereof provided by the present invention completely abandon the hot pressing process, and the overall work flow and process energy consumption are low.

Description

Technical field:

[0001] The present application belongs to the field of building materials, and specifically, relates to an artificial board and a preparation method thereof. Background technology:

[0002] Artificial boards mainly refer to boards made by adding adhesives to processed wood unit materials (wood shavings, fibers, wood chips, wood cores, etc.) and using decorative paper / wood veneer. Artificial boards are generally composed of film paper and base material. Compared with solid wood sawn timber, artificial boards are boards that are formed by decomposing wood and then gluing it together. Their physical properties are somewhat different from those of logs, and their waterproof performance is poor. Therefore, national standards require that the non-contact surface of artificial boards must be veneered and edge-sealed with decorative paper / wood chips and edge banding strips before subsequent furniture processing can be carried out.

[0003] Artificial boards mainly refer to boards made by adding adhesives to processed wood unit materials (wood shavings, fibers, wood chips, wood cores, etc.) and using decorative paper / wood veneer. Artificial boards are generally composed of film paper and base material. Compared with solid wood sawn timber, artificial boards are boards that are formed by decomposing wood and then gluing it together. Their physical properties are somewhat different from those of logs, and their waterproof performance is poor. Therefore, national standards require that the non-contact surface of artificial boards must be veneered and edge-sealed with decorative paper / wood chips and edge banding strips before subsequent furniture processing can be carried out.

[0004] However, the production process of artificial boards still has the following shortcomings: the traditional veneering process mainly includes rolling or flat pressing to perform veneering and gluing operations on the artificial surface, but the overall process cannot be separated from heating and pressurization. When heating and pressurizing the impregnated paper and the substrate, the huge pressure will cause the defects of the substrate itself to appear on the surface through the paper (especially when the substrate is a non-density board); at the same time, heating will also cause uneven distribution of moisture content in the artificial board itself, causing subsequent quality risks; when heating and pressurizing the impregnated paper and the panel substrate, a short stop (about 50s-120s) is required, which is non-continuous production and has too low production efficiency; the panel substrate, impregnated paper and coating produced by traditional processes have insufficient bonding performance, and the curing degree of the surface coating is not high, and the surface coating cannot provide weather resistance, scratch resistance or chemical resistance and other characteristics; in the process of gluing artificial boards by traditional processes, whether it is hot pressing or UV irradiation, certain harmful substances and gas residues will be generated, causing pollution to the environment.

[0005] In view of this, this invention is proposed. Summary of the invention:

[0006] The present invention aims to provide a method for preparing an artificial board which abandons the traditional hot pressing process and can perform modular processing.

[0007] In order to achieve the above object, the present invention provides a method for preparing a wood-based panel, which is carried out in the following steps:

[0008] (1) Immersing the decorative paper in an impregnation liquid;

[0009] (2) bonding the impregnated decorative paper obtained in step (1) onto a substrate and rolling it;

[0010] (3) spraying a stability coating on the decorative paper and performing a leveling treatment to obtain an intermediate piece;

[0011] (4) sending the intermediate piece into an electron beam curing device for electron beam curing, so that the decorative paper is completely glued to the substrate and the stability coating is cured;

[0012] (5) coating the functional coating on the stability coating to obtain an intermediate component coated with the functional coating;

[0013] (6) The intermediate piece coated with the functional coating is sent to an electron beam curing device for electron beam curing to obtain a wood-based panel product.

[0014] Preferably or optionally, the impregnation liquid is composed of the following raw materials in weight percentage: 85-92% of emulsion type phthalic acid bis(propylene) ester resin, 4%-9% of phthalic acid bis(propylene) ester monomer, and the balance is solvent.

[0015] Preferably or alternatively, the solvent is ethanol.

[0016] Preferably or optionally, the raw materials of the impregnation liquid are 90% by weight of emulsion type phthalic acid bis(propylene) resin, 8.5% by weight of phthalic acid bis(propylene) monomer, and the remainder is ethanol.

[0017] Preferably or optionally, the stability coating is composed of the following raw materials in weight percentage: 25-30% adhesion type resin, 25-35% trifunctional fluorocarbon modified polyurethane acrylate, 15-25% functional monomer, 10-20% monofunctional monomer, 0.05-0.2% defoamer, 0.2-0.5% dispersant, and 0.5-2% wetting agent.

[0018] Preferably or optionally, the adhesion-type resin is a bifunctional polyester acrylic resin, the functional monomer is HDDA, and the monofunctional monomer is TMCHA.

[0019] Preferably or optionally, the raw materials of the stability coating are, by weight percentage, 30% of difunctional polyester acrylic resin, 30% of trifunctional fluorine-modified polyurethane acrylic resin, 20% of monomer HDDA, 17.3% of monomer TMCHA, 0.2% of defoamer, 0.5% of dispersant, and 2% of leveling agent.

[0020] Preferably or optionally, the functional coating is composed of the following raw materials in weight percentage: 30-40% main resin, 10-20% structural resin, 15-20% functional monomer, 5-10% functional filler, 0.5-2% metallic pigment, 0.5-2% leveling agent, 0.5-2% dispersant, 0.05-0.2% defoamer, 1-3% ultraviolet absorber, 1-2% polytetrafluoroethylene powder, and 0.5-2% organic fluorine additive.

[0021] Preferably or optionally, the main resin is a trifunctional polyurethane acrylic resin, the structural resin is a 6-8 functional fluorine-modified polyurethane acrylic resin, the functional monomer is any one of PET3A and TMPTMA, the functional filler is any one of 2000 mesh α-type alumina or 2000 mesh silicon carbide, and the metal pigment is mica.

[0022] Preferably or optionally, the raw materials of the functional coating are, by weight percentage: 35% trifunctional polyurethane acrylate, 20% 6-8 functional fluorine-modified polyurethane acrylic resin; 28.3% TMPTMA monomer; 10% 2000 mesh silicon carbide; 1% mica; 0.2% defoamer; 1% dispersant, 1% leveling agent, 2% ultraviolet absorber, 0.5% organic fluorine additive, and 1% polytetrafluoroethylene powder.

[0023] On the other hand, the present invention also provides a man-made board prepared by the above-mentioned preparation method.

[0024] The artificial board and preparation method provided by the present invention completely abandon the hot pressing process compared with the traditional process, and have the characteristics of modular processing, fewer processing links and high efficiency while achieving the same surface effect (or even better effect). The overall work process and process have low energy consumption, and can be made on demand without waiting for shutdown time; the adhesion performance between the panel substrate, the impregnated paper and the coating is more superior, the overall structural stability is high, and the surface coating is more dense, which can achieve the advantages of high weather resistance, scratch resistance and corrosion resistance. Specific implementation method:

[0025] In order to enable those skilled in the art to more clearly understand the application, the application will be described in detail below in conjunction with examples.Before describing, it should be understood that the terms used in this specification and the attached claims should not be interpreted as being limited to the general meaning and dictionary meaning, but should be interpreted according to the meaning and concept corresponding to the technical aspects of the application on the basis of the principle of allowing the inventor to appropriately define the terms for the best interpretation.Therefore, the description proposed here is only for the preferred example for the purpose of illustration, and it is not intended to limit the scope of the application, so that it should be understood that, without departing from the spirit and scope of the application, other equivalents or improved methods can be obtained therefrom, and the scope of the application for protection should be based on the scope defined by the claims.Unless otherwise specified, the reagents and instruments used in the following examples are commercially available products.

[0026] Example 1

[0027] This embodiment provides a man-made board.

[0028] The artificial board is prepared by the following method:

[0029] Decorative paper for artificial board is immersed in an impregnation liquid. In this embodiment, the impregnation liquid is made of 90% by weight of emulsion type phthalic acid bis(propylene) ester resin, 8.5% by weight of phthalic acid bis(propylene) ester monomer, and the remainder of ethanol, which are stirred evenly.

[0030] In this embodiment, the decorative paper used is a conventional commercially available board facing paper in the art, and the decorative paper is completely soaked by naked eye observation, and there is no dried flower phenomenon after drying.

[0031] The impregnated decorative paper is bonded to the substrate and rolled to remove surface bubbles and irregular protrusions.

[0032] After rolling, a stability coating with a thickness of 25 μm is sprayed on the decorative paper and leveling treatment is performed. In this embodiment, the composition of the stability coating is 30% polyester acrylate by weight, the brand of polyester acrylate in this embodiment is EBECRYL547, but 5236-1 or YH7217 can also be selected according to actual conditions; 30% fluorine-modified polyurethane acrylic resin, the brand of fluorine-modified polyurethane acrylic resin in this embodiment is SF-009, but FSP8638, FSP8658, FSP8696 can also be selected according to actual conditions; 20% monomer HDDA; 17.3% monomer TMCHA; 0.2% defoamer; 0.5% dispersant, and 2% leveling agent. The above raw materials are stirred evenly to obtain the stability coating for spraying.

[0033] After the leveling treatment is completed, it is sent to the electron beam curing device for electron beam curing, so that the decorative paper is completely glued to the substrate and the stability coating is cured.

[0034] In this step, the parameters of electron beam curing are electron beam voltage of 150-200 kV and electron beam irradiation dose of 60-80 kGy.

[0035] After electron beam curing, the functional coating was coated at 25g / m 2 The coating amount is applied on the stability coating. In this embodiment, the composition of the functional coating is 35% polyurethane acrylate by weight, the brand selected in this embodiment is 0038M, but CR90145 or EBECRYL8602 can also be selected according to actual conditions; 20% fluorine-modified polyurethane acrylic resin, the brand selected in this embodiment is FSP8668, but L-6905A, L-6905B, L-6905C can also be selected according to actual conditions; 28.3% monomer TMPTMA; 10% silicon carbide; 1% mica; 0.2% defoamer; 1% dispersant; 1% leveling agent; 2% ultraviolet absorber; 0.5% organic fluorine additive; 1% polytetrafluoroethylene powder. The above raw materials are stirred evenly to obtain the functional coating for coating.

[0036] After coating, it is sent to the electron beam curing device again for electron beam curing. The electron beam penetrates the functional coating on the top, the stability coating in the middle, and partially penetrates the completely impregnated decorative paper, so that the functional coating, stability coating, decorative paper and substrate are integrated.

[0037] In this step, the parameters of electron beam curing are electron beam voltage of 150-200 kV and electron beam irradiation dose of 60-80 kGy.

[0038] After the second electron beam curing is completed, the artificial board product is obtained.

[0039] Example 2

[0040] This embodiment provides a man-made board.

[0041] The artificial board is prepared by the following method:

[0042] Decorative paper for artificial board is immersed in an impregnation liquid. In this embodiment, the impregnation liquid is made of 94% by weight of emulsion type phthalic acid bis(propylene) ester resin, 4.5% by weight of phthalic acid bis(propylene) ester monomer, and the remainder of ethanol, which are stirred evenly.

[0043] In this embodiment, the decorative paper used is a conventional commercially available board facing paper in the art, and the decorative paper is completely soaked by naked eye observation, and there is no dried flower phenomenon after drying.

[0044] The impregnated decorative paper is bonded to the substrate and rolled to remove surface bubbles and irregular protrusions.

[0045] After rolling, a stability coating with a thickness of 30 μm is sprayed on the decorative paper and leveling treatment is performed. In this embodiment, the composition of the stability coating is 30% polyester acrylate by weight, the brand of polyester acrylate in this embodiment is EBECRYL547, but 5236-1 or YH7217 can also be selected according to actual conditions; 35% fluorine-modified polyurethane acrylic resin, the brand of fluorine-modified polyurethane acrylic resin in this embodiment is SF-009, but FSP8638, FSP8658, FSP8696 can also be selected according to actual conditions; 15% monomer HDDA; 17.3% monomer TMCHA; 0.2% defoamer; 0.5% dispersant, and 2% leveling agent. The above raw materials are stirred evenly to obtain the stability coating for spraying.

[0046] After the leveling treatment is completed, it is sent to the electron beam curing device for electron beam curing, so that the decorative paper is completely glued to the substrate and the stability coating is cured.

[0047] In this step, the parameters of electron beam curing are electron beam voltage of 150-200 kV and electron beam irradiation dose of 60-80 kGy.

[0048] After electron beam curing, the functional coating was coated at 30 g / m 2 The coating amount is applied on the stability coating. In this embodiment, the composition of the functional coating is 35% polyurethane acrylate by weight, the brand selected in this embodiment is 0038M, but CR90145 or EBECRYL8602 can also be selected according to actual conditions; 20% fluorine-modified polyurethane acrylate resin, the brand selected in this embodiment is FSP8668, but L-6905A, L-6905B, L-6905C can also be selected according to actual conditions; 28.3% monomer PET3A; 10% silicon carbide; 1% mica; 0.2% defoamer; 1% dispersant; 1% leveling agent; 2% ultraviolet absorber; 0.5% organic fluorine additive; 1% polytetrafluoroethylene powder. The above raw materials are stirred evenly to obtain the functional coating for coating.

[0049] After coating, it is sent to the electron beam curing device again for electron beam curing. The electron beam penetrates the functional coating on the top, the stability coating in the middle, and partially penetrates the completely impregnated decorative paper, so that the functional coating, stability coating, decorative paper and substrate are integrated.

[0050] In this step, the parameters of electron beam curing are electron beam voltage of 150-200 kV and electron beam irradiation dose of 60-80 kGy.

[0051] After the second electron beam curing is completed, the artificial board product is obtained.

[0052] Example 3

[0053] This embodiment provides a man-made board.

[0054] The artificial board is prepared by the following method:

[0055] Decorative paper for artificial board is immersed in an impregnation liquid. In this embodiment, the impregnation liquid is made of 90% by weight of emulsion type phthalic acid bis(propylene) ester resin, 8.5% by weight of phthalic acid bis(propylene) ester monomer, and the remainder of ethanol, which are stirred evenly.

[0056] In this embodiment, the decorative paper used is a conventional commercially available board facing paper in the art, and the decorative paper is completely soaked by naked eye observation, and there is no dried flower phenomenon after drying.

[0057] The impregnated decorative paper is bonded to the substrate and rolled to remove surface bubbles and irregular protrusions.

[0058] After rolling, a stability coating with a thickness of 27 μm is sprayed on the decorative paper and leveling treatment is performed. In this embodiment, the composition of the stability coating is 30% polyester acrylate by weight, the brand of polyester acrylate in this embodiment is EBECRYL547, but 5236-1 or YH7217 can also be selected according to actual conditions; 30% fluorine-modified polyurethane acrylic resin, the brand of fluorine-modified polyurethane acrylic resin in this embodiment is SF-009, but FSP8638, FSP8658, FSP8696 can also be selected according to actual conditions; 20% monomer HDDA; 17.3% monomer TMCHA; 0.2% defoamer; 0.5% dispersant, and 2% leveling agent. The above raw materials are stirred evenly to obtain the stability coating for spraying.

[0059] After the leveling treatment is completed, it is sent to the electron beam curing device for electron beam curing, so that the decorative paper is completely glued to the substrate and the stability coating is cured.

[0060] In this step, the parameters of electron beam curing are electron beam voltage of 150-200 kV and electron beam irradiation dose of 60-80 kGy.

[0061] After electron beam curing, the functional coating was coated at 27g / m 2The coating amount is applied on the stability coating. In this embodiment, the composition of the functional coating is 40% polyurethane acrylate by weight, the brand selected in this embodiment is 0038M, but CR90145 or EBECRYL8602 can also be selected according to actual conditions; 20% fluorine-modified polyurethane acrylic resin, the brand selected in this embodiment is FSP8668, but L-6905A, L-6905B, L-6905C can also be selected according to actual conditions; 28.3% monomer TMPTMA; 5% silicon carbide; 1% mica; 0.2% defoamer; 1% dispersant; 1% leveling agent; 2% ultraviolet absorber; 0.5% organic fluorine additive; 1% polytetrafluoroethylene powder. The above raw materials are stirred evenly to obtain the functional coating for coating.

[0062] After coating, it is sent to the electron beam curing device again for electron beam curing. The electron beam penetrates the functional coating on the top, the stability coating in the middle, and partially penetrates the completely impregnated decorative paper, so that the functional coating, stability coating, decorative paper and substrate are integrated.

[0063] Comparative Example 1

[0064] This comparative example provides a wood-based panel.

[0065] The preparation process of the artificial board in this comparative example is basically the same as that in Example 1, except that the polyester acrylic resin in the stability coating is not added, and the proportion of the fluorine-modified polyurethane acrylic resin is increased to 55%.

[0066] Comparative Example 2

[0067] This comparative example provides a wood-based panel.

[0068] The preparation process of the artificial board in this comparative example is basically the same as that in Example 1, except that no ultraviolet absorber and silicon carbide are added to the functional coating.

[0069] Comparative Example 3

[0070] This comparative example provides a wood-based panel.

[0071] The preparation process of the artificial board in this comparative example is basically the same as that in Example 1, except that the monomer TMPTMA in the functional coating is replaced by HDDA.

[0072] Comparative Example 4

[0073] This comparative example provides a wood-based panel.

[0074] The preparation process of the artificial board in this comparative example is basically the same as that in Example 1, except that 55% polyurethane acrylic resin is added to the functional coating instead of fluorine-modified polyurethane acrylic resin.

[0075] Effect Example 1

[0076] The artificial boards prepared in Example 1 and Comparative Examples 1-4 were tested for adhesion, weather resistance, chemical resistance, burn resistance, and scratch resistance.

[0077] Among them, the paint film adhesion is based on GB / T 4893.4-2013 "Test for physical and chemical properties of furniture surface paint film Part 4 Adhesion cross-cutting determination method"

[0078] The surface hardness is tested based on the standard method GB / T 6739-2006 "Paints and varnishes - Determination of film hardness by pencil method".

[0079] Weather resistance is tested based on the standard method of GB / T 23983-2009 “Determination of Yellowing Resistance of Wood Coatings”.

[0080] Chemical resistance and burn resistance are based on the surface stain resistance test and cigarette burn resistance test methods in the standard method of GB / T 17657-2013 "Test methods for physical and chemical properties of wood-based panels and veneer wood-based panels". The surface stain resistance is tested using chemical reagents such as sodium hydroxide, hydrochloric acid, ethanol, and sodium bicarbonate.

[0081] Scratch resistance is tested based on the standard method of EN 438-2-2016 "High Pressure Laminate (HPL) for Decorative Use" using Martindale testing equipment.

[0082] The experimental results of each group are shown in Table 1.

[0083]

[0084] Table 1. Test results of wood-based panel performance

[0085] As can be seen from Table 1, the scheme in Example 1 of the present invention, through the selection of components and the optimization of the addition amount, makes the adhesion, weather resistance, chemical resistance, burn resistance and scratch resistance of the final product reach the best level. At the same time, compared with the traditional process, the method provided by the present invention completely abandons the hot pressing process, and has the characteristics of modular processing, fewer processing links and high efficiency while achieving the same surface effect (or even better effect). The overall workflow and process energy consumption are low, and it can be made on demand without waiting for the shutdown time, and has good application prospects.

[0086] The above-mentioned specific embodiments of the present application are merely preferred embodiments for explaining the present application, and are not limitations of the present application. After reading this specification, those skilled in the art may make modifications without creative contribution as needed. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a wood-based panel, characterized in that: Follow the steps below in order: (1) Immersing the decorative paper in an impregnation liquid; (2) bonding the impregnated decorative paper obtained in step (1) onto a substrate and rolling it; (3) spraying a stability coating on the decorative paper and performing a leveling treatment to obtain an intermediate piece; The raw materials of the stability coating are 30% of bifunctional polyester acrylic resin, 30% of trifunctional fluorine-modified polyurethane acrylic resin, and 20% of monomer HDDA in terms of weight percentage; Monomer TMCHA 17.3%; defoamer 0.2%; dispersant 0.5%, leveling agent 2%; or, the raw materials of the stability coating are 30% polyester acrylate, 35% fluorine-modified polyurethane acrylic resin, 15% monomer HDDA, 17.3% monomer TMCHA, 0.2% defoamer; 0.5% dispersant, 2% leveling agent by weight percentage; (4) sending the intermediate piece into an electron beam curing device for electron beam curing, so that the decorative paper is completely glued to the substrate and the stability coating is cured; (5) applying a functional coating on the stability coating to obtain an intermediate member coated with the functional coating; the functional coating comprises the following raw materials: a main resin, a structural resin, a functional monomer, a functional filler, a metal pigment, a leveling agent, a dispersant, a defoaming agent, an ultraviolet absorber, polytetrafluoroethylene powder and an organic fluorine additive; the main resin is a trifunctional polyurethane acrylic resin, the structural resin is a 6-8 functional fluorine-modified polyurethane acrylic resin, and the functional monomer is any one of PET3A and TMPTMA; (6) The intermediate piece coated with the functional coating is sent to an electron beam curing device for electron beam curing to obtain a wood-based panel product.

2. The method for preparing a wood-based panel according to claim 1, characterized in that: The impregnation liquid is composed of the following raw materials in percentage by weight: 85-92% of emulsion type phthalic acid bis(propylene) ester resin, 4%-9% of phthalic acid bis(propylene) ester monomer, and the remainder is solvent.

3. The method for preparing a wood-based panel according to claim 2, characterized in that: The solvent is ethanol.

4. The method for preparing a wood-based panel according to claim 3, characterized in that: The raw materials of the impregnation liquid are 90% by weight of emulsion type phthalic acid bis(propylene) ester resin, 8.5% by weight of phthalic acid bis(propylene) ester monomer, and the balance is ethanol.

5. The method for preparing a wood-based panel according to claim 1, characterized in that: The functional filler is any one of 2000 mesh alpha-type aluminum oxide or 2000 mesh silicon carbide, and the metal pigment is mica.

6. The method for preparing a wood-based panel according to claim 5, characterized in that: The raw materials of the functional coating are as follows: 35% trifunctional polyurethane acrylate, 20% 6-8 functional fluorine-modified polyurethane acrylic resin by weight percentage; Monomer TMPTMA 28.3%; 2000 mesh silicon carbide 10%; mica 1%; Defoamer 0.2%; dispersant 1%, leveling agent 1%, UV absorber 2%, organic fluorine additive 0.5%, polytetrafluoroethylene powder 1%; Alternatively, the composition of the functional coating is, by weight percentage, 40% polyurethane acrylate, 20% fluorine-modified polyurethane acrylic resin, 28.3% TMPTMA monomer, 5% silicon carbide, 1% mica, 0.2% defoamer, 1% dispersant, 1% leveling agent, 2% UV absorber, 0.5% organic fluorine additive and 1% polytetrafluoroethylene micropowder.

7. A wood-based panel, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 6.

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