High-strength and high-toughness artificial decorative plate and preparation method thereof

Abstract

The invention discloses a high-strength and high-toughness artificial decorative plate. The artificial decorative plate comprises a bottom layer and a surface layer which are sequentially arranged from bottom to top; the bottom layer is obtained by hot-press molding and curing of bottom layer slurry, and the surface layer is obtained by hot-press molding and curing of surface layer slurry; the bottom layer slurry comprises the following components in percentage by mass: 30-40% of modified coffee grounds, 20-35% of sawdust, 5-20% of plant fibers and 10-20% of an isocyanate adhesive; the surface layer slurry comprises the following components in percentage by mass: 70-80% of a color raw material and 20-30% of an isocyanate adhesive; the modified coffee grounds in the bottom layer slurry and the surface layer slurry comprise coffee grounds and a succinic acid water solution. According to the high-strength and high-toughness artificial decorative plate provided by the invention, the coffee grounds are added into the artificial decorative plate, so that the artificial decorative plate has both high strength and high toughness on the premise of improving the utilization rate of the coffee grounds and saving the cost.

Description

Technical Field

[0001] The invention relates to the technical field of artificial decorative panels, and in particular to an artificial decorative panel with high strength and high toughness and a preparation method thereof. Background Art

[0002] Artificial decorative panels are a new type of wall decoration material made from wood or other lignocellulosic material scraps, which are cured under heat and pressure after adhesive is applied. Due to its good physical properties and easy processing, it is widely used in interior decoration, furniture manufacturing, architectural decoration and other fields.

[0003] Although artificial decorative panels have many advantages, the balance between flexibility and strength is still challenging. As a decorative material, artificial decorative panels need to have a certain degree of flexibility to adapt to different design requirements, such as the need to disperse and absorb stress and reduce deformation and damage caused by stress concentration. At the same time, they also need to have sufficient strength to ensure their load-bearing capacity, stability and integrity. However, flexibility is closely related to elastic modulus and deformation capacity. The lower the elastic modulus, the stronger the deformation capacity and the higher the flexibility. However, too low elastic modulus and deformation capacity often lead to reduced strength, making it difficult for artificial decorative panels to achieve a balance between flexibility and strength.

[0004] With the rapid growth of global coffee consumption, the generation of a large amount of coffee grounds has become an urgent problem to be solved. Traditional landfill and incineration methods not only occupy a large amount of land resources, but also release greenhouse gases during the incineration process, exacerbating global climate change. Therefore, the resource utilization of coffee grounds has become a new topic that has attracted much attention in recent years.

[0005] In order to overcome the defects of the existing technology, researchers have adopted a variety of technical means to process coffee grounds. For example, the Chinese invention patent with publication number CN105217629A discloses a method for preparing coffee grounds activated carbon, which removes the oil from the coffee grounds by vacuum pyrolysis and then activates it with phosphoric acid to obtain coffee grounds activated carbon. In addition, the Chinese invention patent with publication number CN106147166A discloses a method for preparing a modified composite material by combining coffee grounds and polylactic acid, but due to the high cost of polylactic acid, the obtained composite material is difficult to achieve real marketization and scale.

[0006] However, it is worth noting that the resource utilization of coffee grounds in the prior art does not involve the manufacture of artificial decorative panels. Therefore, exploring the application of coffee grounds in artificial decorative panels to achieve its resource utilization and improve the performance of artificial decorative panels at the same time has important research value and practical significance. Summary of the invention

[0007] The purpose of the present invention is to propose an artificial decorative board with high strength and high toughness. Coffee grounds are added to the artificial decorative board. On the premise of improving the utilization rate of the coffee grounds and saving costs, the artificial decorative board has both high strength and high flexibility, so as to overcome the shortcomings of the prior art.

[0008] Another object of the present invention is to propose a method for preparing a high-strength and high-toughness artificial decorative board. The preparation method is simple and easy to operate, ensuring that the elastic modulus of the obtained artificial decorative board is ≥1830MPa, the static bending strength is ≥15.4MPa, the internal bonding strength is ≥2.2MPa, and the surface bonding strength is ≥1.5MPa, and it has high strength and high flexibility.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] A high-strength and high-toughness artificial decorative board, comprising a bottom layer and a surface layer arranged in sequence from bottom to top; the bottom layer is obtained by hot-pressing and curing the bottom layer slurry, and the surface layer is obtained by hot-pressing and curing the surface layer slurry;

[0011] Calculated by mass percentage, the bottom slurry includes 30-40% of modified coffee grounds, 20-35% of sawdust, 5-20% of plant fiber and 10-20% of isocyanate adhesive;

[0012] Calculated by mass percentage, the surface slurry includes 70-80% of color raw material and 20-30% of isocyanate adhesive;

[0013] The color raw materials include any one or a combination of multiple of modified coffee grounds, sawdust, plant fibers and color powder;

[0014] The modified coffee grounds in the bottom slurry and the surface slurry both include coffee grounds and a succinic acid aqueous solution.

[0015] Furthermore, calculated by mass percentage, the modified coffee grounds in the bottom slurry and the surface slurry both include 93-98.5% of coffee grounds and 1.5-7% of a succinic acid aqueous solution.

[0016] Furthermore, the mesh sizes of the modified coffee grounds in the bottom slurry and the surface slurry are both 20-200 meshes, and the mesh sizes of the sawdust are both 20-30 meshes.

[0017] Furthermore, the length of the plant fibers in the bottom slurry and the surface slurry is 0.5 to 2 cm.

[0018] Furthermore, calculated by mass percentage, the moisture content of the modified coffee grounds, sawdust and plant fibers in the bottom slurry and the surface slurry is 10-15%.

[0019] Furthermore, the plant fibers in the bottom slurry and the surface slurry include any one or more combinations of straw fibers, stalk fibers and sugarcane leaf fibers.

[0020] Furthermore, the wood chips in the bottom slurry and the surface slurry include any one of bamboo wood chips and pine wood chips.

[0021] A method for preparing a high-strength and high-toughness artificial decorative board, used for preparing the above-mentioned high-strength and high-toughness artificial decorative board, comprises the following steps:

[0022] A. Evenly mix the formulated amount of coffee grounds and the succinic acid aqueous solution, and sieve to obtain modified coffee grounds;

[0023] B. According to the formula of the bottom slurry, the modified coffee grounds, sawdust and part of the isocyanate adhesive are mixed evenly to obtain a first mixture; the plant fiber and the remaining isocyanate adhesive are added to the first mixture and mixed evenly to obtain a bottom slurry;

[0024] C. According to the formula of the surface layer slurry, the modified coffee grounds, sawdust and part of the isocyanate adhesive are mixed evenly to obtain a second mixture; the plant fiber and the remaining isocyanate adhesive are added to the second mixture and mixed evenly to obtain a base surface layer slurry;

[0025] D. adding a formulated amount of toner to the base surface slurry to obtain a surface slurry;

[0026] E. Injecting the surface layer slurry into the mold to form the surface layer; injecting the bottom layer slurry on the surface of the surface layer to form the bottom layer, and after hot pressing and curing, obtaining a high-strength and high-toughness artificial decorative board.

[0027] Furthermore, in step E, the hot pressing molding pressure is 1-5 MPa, the temperature is 110-120° C., and the hot pressing time is 10-15 min.

[0028] Furthermore, in step E, the static bending strength of the high-strength and high-toughness artificial decorative board is ≥15.4MPa, the elastic modulus is ≥1830MPa, the internal bonding strength is ≥2.2MPa, and the surface bonding strength is ≥1.5MPa.

[0029] The technical solution provided by the present invention may include the following beneficial effects:

[0030] 1. In this technical solution, the modified coffee grounds, sawdust, plant fibers and isocyanate adhesive in the bottom slurry are combined to make the bottom slurry have high strength and high toughness after curing, so that the artificial decorative board has both high strength and high toughness. In addition, this technical solution modifies the coffee grounds to obtain modified coffee grounds, so that the coffee grounds can be fully utilized, which not only turns waste into treasure, greatly reduces production costs, but also improves the strength and flexibility of artificial stone panels.

[0031] 2. The surface slurry of the technical solution includes color raw materials and isocyanate adhesive; the color raw materials include any one or more combinations of modified coffee grounds, sawdust, plant fibers and color powders, and the modified coffee grounds in the color raw materials are dark brown, the sawdust is yellow-white, and the plant fibers are yellow. In addition, the color powder can be selected according to the needs, so that the color of the surface layer is rich and varied, so that there is no need to stick another decorative layer on the surface of the artificial decorative board to ensure the aesthetics of the artificial decorative board. In addition, the color raw materials in the technical solution include any one or more combinations of modified coffee grounds, sawdust, plant fibers and color powders, so that the surface slurry can select the raw materials and the amount of raw materials added according to the actual aesthetic requirements, further improving the flexibility of the preparation of artificial decorative boards. DETAILED DESCRIPTION

[0032] The technical solution provides a high-strength and high-toughness artificial decorative board, comprising a bottom layer and a surface layer arranged in sequence from bottom to top; the bottom layer is obtained by hot-pressing and curing the bottom layer slurry, and the surface layer is obtained by hot-pressing and curing the surface layer slurry;

[0033] Calculated by mass percentage, the bottom slurry includes 30-40% of modified coffee grounds, 20-35% of sawdust, 5-20% of plant fiber and 10-20% of isocyanate adhesive;

[0034] Calculated by mass percentage, the surface slurry includes 70-80% of color raw material and 20-30% of isocyanate adhesive;

[0035] The color raw materials include any one or a combination of multiple of modified coffee grounds, sawdust, plant fibers and color powder;

[0036] The modified coffee grounds in the bottom slurry and the surface slurry both include coffee grounds and a succinic acid aqueous solution.

[0037] In order to solve the problem in the prior art that it is difficult for artificial decorative panels to simultaneously take into account high strength, high flexibility and the utilization of coffee grounds, the present technical solution proposes an artificial decorative panel with high strength and high toughness. By designing the ratio of the base slurry and the surface slurry and optimizing the raw materials, the artificial decorative panel can take into account high strength and high flexibility while improving the utilization rate of coffee grounds and greatly reducing production costs, thereby meeting actual usage needs.

[0038] Specifically, the bottom slurry in the technical solution includes modified coffee grounds, sawdust, plant fiber and isocyanate adhesive. Among them, the main component of coffee grounds is wood cellulose containing a large number of hydroxyl groups in the molecular chain, so that the modified coffee grounds contain a large number of hydroxyl groups; sawdust is mainly composed of lignin, cellulose and hemicellulose, and each glucose group in the cellulose molecular chain contains two secondary alcohol hydroxyl groups and one primary alcohol hydroxyl group, so that the sawdust also contains a large number of hydroxyl groups; plant fiber is mainly composed of cellulose and hemicellulose, and the cellulose molecular chain contains hydroxyl groups, and the surface of the plant fiber also contains abundant functional groups such as hydroxyl groups and carboxyl groups. The above two aspects of the effects make the plant fiber also contain a large number of hydroxyl groups. In addition, the isocyanate in the isocyanate adhesive contains a highly polar and highly chemically active isocyanate group (-NCO), which can react with the hydroxyl groups in the modified coffee grounds, sawdust and plant fiber to form a stable chemical bond, thereby promoting the solidification of the bottom slurry, so that the bottom slurry is bonded to form a whole after solidification, and the strength of the artificial decorative board is ensured.

[0039] Secondly, the raw materials of the modified coffee grounds in the bottom slurry include coffee grounds and succinic acid aqueous solution. The succinic acid in the succinic acid aqueous solution is a dibasic acid with two carboxyl groups, and the carboxyl groups in the succinic acid can react with the isocyanate groups in the isocyanate adhesive to generate amide compounds, which accelerates the curing reaction of the system and ensures the strength of the artificial decorative board. In addition, the anhydride and water generated by the dehydration reaction of the succinic acid itself during the hot pressing process can react with the isocyanate groups in the isocyanate adhesive, thereby greatly promoting the curing of the bottom slurry and the surface slurry, and greatly improving the strength of the artificial decorative board.

[0040] Furthermore, the filling effect of modified coffee grounds and sawdust enhances the compactness of the bottom layer and improves the strength of the artificial decorative board; the plant fiber can be crisscrossed and has flexibility and bendability, playing the role of frame connection, so that the bottom slurry has high strength and high flexibility, thereby meeting different design requirements and avoiding deformation and damage caused by stress concentration, ensuring its service life and integrity; further, the coffee grounds themselves and succinic acid have antibacterial effects, so the modified coffee grounds also have antibacterial effects. When the modified coffee grounds are added to the bottom slurry, it is beneficial to give the artificial decorative board a certain antibacterial property. In addition, the coffee grounds themselves have a certain fragrance, which gives the artificial decorative board a fragrance and improves its market value.

[0041] Therefore, in the technical solution, the modified coffee grounds, sawdust, plant fibers and isocyanate adhesive in the bottom slurry are combined to make the bottom slurry have high strength and high toughness after curing, so that the artificial decorative board has both high strength and high toughness. In addition, the technical solution modifies the coffee grounds to obtain modified coffee grounds, so that the coffee grounds can be fully utilized, which not only turns waste into treasure, greatly reduces production costs, but also improves the strength and flexibility of the artificial stone board.

[0042] It should be noted that since the coffee grounds in the modified coffee grounds are modified by succinic acid, succinic acid has two carboxyl groups, that is, succinic acid is beneficial to increase the degree of reaction between the modified coffee grounds (i.e., modified coffee grounds) and the isocyanate adhesive, thereby improving the bonding strength between the modified coffee grounds and the isocyanate adhesive. When ordinary coffee grounds are used to replace the modified coffee grounds in the present technical solution, the requirements of the present technical solution cannot be met.

[0043] Secondly, in order to improve the aesthetics of the existing artificial decorative boards, it is usually necessary to paste an additional decorative layer (such as natural veneer, melamine impregnated paper, phenolic resin impregnated paper pre-coated decorative paper and thermoplastic resin film, etc.) on the outside of the prepared artificial decorative boards, resulting in a high cost of artificial decorative boards. The surface slurry of the present technical solution includes color raw materials and isocyanate adhesives; the color raw materials include any one or more combinations of modified coffee grounds, sawdust, plant fibers and color powders, and the modified coffee grounds in the color raw materials are dark brown, the sawdust is yellow-white, and the plant fibers are yellow. In addition, the color powder can be selected according to the needs, so that the color of the surface layer is rich and varied, so that the aesthetics of the artificial decorative board can be ensured without pasting a decorative layer on the surface of the artificial decorative board. In addition, the color raw materials in the present technical solution include any one or more combinations of modified coffee grounds, sawdust, plant fibers and color powders, so that the surface slurry can select the raw materials and the amount of raw materials added according to the actual aesthetic requirements, further improving the flexibility of the preparation of artificial decorative boards. In addition, the color raw materials in the surface slurry of the present technical solution have the same function as the raw materials in the base slurry, and can also react with the isocyanate group in the isocyanate adhesive, so that the surface slurry has high strength and high toughness after curing, thereby further making the artificial decorative board have both high strength and high toughness. The surface slurry also uses modified coffee grounds, which is also beneficial to further improve the performance of the artificial decorative board.

[0044] Finally, calculated by mass percentage, the raw materials of the base slurry include 30-40% modified coffee grounds, 20-35% sawdust, 5-20% plant fiber and 10-20% isocyanate adhesive; the surface slurry includes 70-80% color raw materials and 20-30% isocyanate adhesive; the color raw materials include any one or a combination of more of modified coffee grounds, sawdust, plant fiber and color powder. Since the types of raw materials for the base slurry and the surface slurry are basically the same and only the combination of types is different, the color diversification can be achieved by adjusting the formula of the surface slurry without increasing additional costs, which is conducive to further improving the preparation flexibility and market competitiveness of artificial decorative panels.

[0045] Preferably, the isocyanate adhesives in the bottom slurry and the surface slurry are 9131FC isocyanate adhesive.

[0046] 9131FC isocyanate adhesive is a specially designed adhesive based on polymerized methylene diphenyl diisocyanate (pMDI) produced by Wanhua Chemical. It not only has a strong bonding effect, but is also formaldehyde-free, thus ensuring the safety of artificial decorative panels.

[0047] Preferably, the thickness of the bottom layer is 12 to 16 mm, and the thickness of the surface layer is 1 to 2 mm.

[0048] A thicker bottom layer can provide better strength and stability, ensuring that the artificial decorative board can withstand greater weight and pressure during use and is not easily deformed or damaged. A thinner surface layer can more easily show decorative effects such as color, texture and texture, and improve the aesthetics of the artificial decorative board. Therefore, the thickness of the bottom layer and the surface layer is limited in this technical solution to ensure the performance and aesthetics of the artificial decorative board.

[0049] Further, calculated by mass percentage, the modified coffee grounds in the bottom slurry and the surface slurry both include 93-98.5% of coffee grounds and 1.5-7% of a succinic acid aqueous solution.

[0050] The amount of succinic acid added will affect the modification effect of coffee grounds. If the amount of succinic acid added is too little, the modification effect will not be significant, which is not conducive to improving the strength and antibacterial properties of artificial decorative boards. Since succinic acid is often used as an acidity regulator in food and has a weak sour taste, adding too much will weaken the fragrance. If the amount of succinic acid added is too much, it will affect the fragrance of the coffee grounds themselves, thereby affecting the fragrance of artificial decorative boards and greatly reducing their market value. Therefore, in this technical solution, by limiting the amount of succinic acid aqueous solution added, the fragrance of the product is ensured while being conducive to improving the strength and antibacterial properties of artificial decorative boards, thereby enhancing their market value.

[0051] Preferably, the succinic acid aqueous solution comprises succinic acid and water, and calculated by mass ratio, the mixing ratio of succinic acid to water is (1-1.2):2.

[0052] In the present technical solution, succinic acid is dissolved by water and the mixing ratio of succinic acid and water is limited, so that succinic acid can modify coffee grounds, thereby increasing the degree of reaction between the modified coffee grounds and isocyanate adhesive, thereby increasing the strength of the artificial decorative board.

[0053] It is further explained that the mesh size of the modified coffee grounds in the bottom slurry and the surface slurry is 20-200 meshes, and the mesh size of the sawdust is 20-30 meshes.

[0054] In the present technical solution, the mesh size of the modified coffee grounds and sawdust is limited so that the specific surface area of ​​the modified coffee grounds and sawdust is larger, thereby promoting the reaction of the modified coffee grounds and sawdust with the isocyanate groups in the isocyanate adhesive and improving the strength of the product; in addition, limiting the mesh size of the modified coffee grounds and sawdust is also conducive to ensuring their filling performance as fillers, thereby ensuring the quality stability and consistency of the artificial decorative board products.

[0055] It is further explained that the length of the plant fibers in the bottom slurry and the surface slurry is 0.5 to 2 cm.

[0056] Plant fiber has a low density and is very easy to fly when mixed with other raw materials. If its length is too short, it will fly severely, causing raw material loss; if its length is too long, it will easily make mixing with other raw materials more difficult and reduce the bonding ability, thus affecting the performance of artificial decorative boards.

[0057] It is further explained that, calculated by mass percentage, the moisture content of the modified coffee grounds, sawdust and plant fibers in the bottom slurry and the surface slurry is 10-15%.

[0058] Due to the high reactivity of the isocyanate group in the isocyanate adhesive, it may react with the active hydrogen in the water molecules in the modified coffee grounds, sawdust and plant fibers, which is beneficial to improve the bonding strength between the modified coffee grounds, sawdust and plant fibers and the isocyanate adhesive. However, when the water content in the modified coffee grounds, sawdust and plant fibers is too high, the active hydrogen in the water molecules may consume a large amount of isocyanate groups, thereby reducing the number of isocyanate groups that should have reacted with the functional groups in the modified coffee grounds, sawdust and plant fibers, thereby reducing the collision frequency between the functional groups in the modified coffee grounds, sawdust and plant fibers and the isocyanate groups in the isocyanate adhesive, thereby slowing down the reaction rate; in addition, excessive moisture may also form a layer of water film on the surface of the modified coffee grounds, sawdust and plant fibers, and the water film will hinder the isocyanate adhesive from penetrating into the interior of the above materials, resulting in a reduction in the contact area between the adhesive and the above materials, a reduction in reaction sites, and thus a reduction in reaction efficiency. Therefore, in the present technical solution, the moisture content of the modified coffee grounds, sawdust and plant fibers in the bottom slurry and the surface slurry is limited to 10-15%, which is beneficial to improving the curing efficiency and the strength of the artificial decorative board.

[0059] It is further explained that the plant fibers in the bottom slurry and the surface slurry include any one or more combinations of straw fibers, stalk fibers and sugarcane leaf fibers.

[0060] Rice straw fiber and sugarcane leaf fiber are soft, have good moisture absorption and air permeability, and straw fiber has high strength and toughness. Therefore, the plant fibers in the bottom slurry and the surface slurry of the present technical solution include any one or more combinations of rice straw fiber, straw fiber and sugarcane leaf fiber, which is beneficial to ensure the performance of the artificial decorative board.

[0061] It is further explained that the wood chips in the bottom slurry and the surface slurry include any one of bamboo wood chips and pine wood chips.

[0062] Bamboo sawdust and pine sawdust are both dense and compact in structure, which is beneficial to improving the density of the bottom layer and the surface layer; in addition, bamboo sawdust and pine sawdust are similar in structure to modified coffee grounds, which is beneficial to improving the binding property of bamboo sawdust and pine sawdust with modified coffee grounds, thereby also beneficial to improving the density of the bottom layer and the surface layer; the above two aspects of improving the density of the bottom layer and the surface layer cooperate with each other, which is beneficial to increase the strength of the artificial decorative board.

[0063] A method for preparing a high-strength and high-toughness artificial decorative board, used for preparing the above-mentioned high-strength and high-toughness artificial decorative board, comprises the following steps:

[0064] A. Evenly mix the formulated amount of coffee grounds and the succinic acid aqueous solution, and sieve to obtain modified coffee grounds;

[0065] B. According to the formula of the bottom slurry, the modified coffee grounds, sawdust and part of the isocyanate adhesive are mixed evenly to obtain a first mixture; the plant fiber and the remaining isocyanate adhesive are added to the first mixture and mixed evenly to obtain a bottom slurry;

[0066] C. According to the formula of the surface layer slurry, the modified coffee grounds, sawdust and part of the isocyanate adhesive are mixed evenly to obtain a second mixture; the plant fiber and the remaining isocyanate adhesive are added to the second mixture and mixed evenly to obtain a base surface layer slurry;

[0067] D. adding a formulated amount of toner to the base surface slurry to obtain a surface slurry;

[0068] E. Injecting the surface layer slurry into the mold to form the surface layer; injecting the bottom layer slurry on the surface of the surface layer to form the bottom layer, and after hot pressing and curing, obtaining a high-strength and high-toughness artificial decorative board.

[0069] The technical solution also proposes a method for preparing a high-strength and high-toughness artificial decorative board, which has simple steps and strong operability, and ensures that the obtained artificial decorative board has high strength and high flexibility.

[0070] In some embodiments, the present solution can also add color powders of different colors to the base surface layer slurry to obtain surface layer slurries of different colors, and then inject the surface layer slurries of different colors into each fabric cavity of the mold to form a surface layer, thereby realizing customized design of regional fabrics and colors, further improving the color richness of the artificial decorative panels, and thus improving their aesthetics.

[0071] It should be noted that the surface layer slurries of different colors in the present technical solution can also be injected into the mold through the cloth screen to form the surface layer, which will not be described in detail here.

[0072] Further, in step E, the pressure of the hot pressing molding is 1-5 MPa, the temperature is 110-120° C., and the hot pressing time is 10-15 min.

[0073] The heating temperature of the modified coffee grounds is lower than 120°C. If the temperature is too high, the modified coffee grounds will be coked, affecting the appearance of the product; higher pressure can increase the density of the artificial decorative board, thereby increasing the performance of the artificial decorative board, but the density of the artificial decorative board has an upper limit, and increasing the pressure after reaching the upper limit has little effect on it; isocyanate adhesive has high reactivity, and the hot pressing time of 10 to 15 minutes can make it react more completely with the raw materials. Therefore, the pressure, temperature and hot pressing time of hot pressing molding are limited in this technical solution, which is conducive to ensuring the performance of the artificial decorative board while saving costs and improving production efficiency.

[0074] Further description: in step E, the static bending strength of the high-strength and high-toughness artificial decorative board is ≥15.4MPa, the elastic modulus is ≥1830MPa, the internal bonding strength is ≥2.2MPa, and the surface bonding strength is ≥1.5MPa.

[0075] In step E of the present technical solution, the obtained high-strength and high-toughness artificial decorative board has an elastic modulus ≥1830MPa, a static bending strength ≥15.4MPa, an internal bonding strength ≥2.2MPa, and a surface bonding strength ≥1.5MPa, and has high strength and high flexibility.

[0076] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0077] Example 1

[0078] In this embodiment, the raw materials of the bottom slurry include 35% of modified coffee grounds with a mesh size of 20 mesh, 30% of bamboo sawdust with a mesh size of 25 mesh, 20% of straw fiber with a length of 1 cm, and 20% of 9131FC isocyanate adhesive 15%;

[0079] Calculated by mass percentage, the raw materials of the surface slurry include 20% modified coffee grounds with a mesh size of 20, 30% bamboo sawdust with a mesh size of 25, 10% straw fiber with a length of 1 cm, 20% red color powder and 9131FC isocyanate adhesive 20%;

[0080] Calculated by mass percentage, the raw materials of the modified coffee grounds in the bottom slurry and the surface slurry both include 98% coffee grounds and 2% succinic acid aqueous solution; calculated by mass ratio, the mixing ratio of succinic acid and water in the succinic acid aqueous solution is 1.2:2;

[0081] The method for preparing the high-strength and high-toughness artificial decorative board of this embodiment comprises the following steps:

[0082] A. Evenly mix the formulated amount of coffee grounds and the succinic acid aqueous solution, and sieve to obtain modified coffee grounds;

[0083] B. According to the formula of the bottom slurry, the modified coffee grounds, bamboo sawdust and 60% of the isocyanate adhesive are mixed evenly to obtain a first mixture; the straw fiber and 40% of the isocyanate adhesive are added to the first mixture and mixed evenly to obtain a bottom slurry;

[0084] C. According to the formula of the surface slurry, the modified coffee grounds, bamboo sawdust and 60% of the isocyanate adhesive are mixed evenly to obtain a second mixture; the straw fiber and 40% of the isocyanate adhesive are added to the second mixture and mixed evenly to obtain a basic surface slurry;

[0085] D. adding a formulated amount of red toner to the base surface slurry to obtain a surface slurry;

[0086] E. Inject the surface layer slurry into the mold to form the surface layer; inject the bottom layer slurry on the surface of the surface layer to form the bottom layer, and hot press mold it under the conditions of pressure of 3MPa and temperature of 110°C for 10 minutes, and then solidify to obtain a high-strength and high-toughness artificial decorative board.

[0087] Example 2

[0088] In this embodiment, the raw materials of the bottom slurry include 32% of modified coffee grounds with a mesh size of 30 mesh, 33% of pine wood chips with a mesh size of 20 mesh, 18% of straw fibers with a length of 1.5 cm, and 18% of stalk fibers with a length of 1.5 cm. 9131FC isocyanate adhesive 17%;

[0089] The raw materials of the surface slurry include 30% modified coffee grounds with a mesh size of 30, 10% pine wood chips with a mesh size of 20, 15% straw fiber with a length of 1.5 cm, 20% blue toner and 9131FC isocyanate adhesive 25%;

[0090] Calculated by mass percentage, the raw materials of the modified coffee grounds in the bottom slurry and the surface slurry both include 95% coffee grounds and 5% succinic acid aqueous solution; calculated by mass ratio, the mixing ratio of succinic acid and water in the succinic acid aqueous solution is 1:2;

[0091] The method for preparing the high-strength and high-toughness artificial decorative board of this embodiment comprises the following steps:

[0092] A. Evenly mix the formulated amount of coffee grounds and the succinic acid aqueous solution, and sieve to obtain modified coffee grounds;

[0093] B. According to the formula of the bottom slurry, the modified coffee grounds, pine wood chips and 70% of the isocyanate adhesive are mixed evenly to obtain a first mixture; the straw fibers and 30% of the isocyanate adhesive are added to the first mixture and mixed evenly to obtain a bottom slurry;

[0094] C. According to the formula of the surface layer slurry, the modified coffee grounds, pine wood chips and 70% of the isocyanate adhesive are mixed evenly to obtain a second mixture; the straw fibers and 30% of the isocyanate adhesive are added to the second mixture and mixed evenly to obtain a basic surface layer slurry;

[0095] D. adding a formulated amount of blue toner to the base surface slurry to obtain a surface slurry;

[0096] E. Inject the surface layer slurry into the mold to form the surface layer; inject the bottom layer slurry on the surface of the surface layer to form the bottom layer, and hot press mold it under the conditions of pressure of 5 MPa and temperature of 110°C for 10 minutes, and then solidify to obtain a high-strength and high-toughness artificial decorative board.

[0097] Example 3

[0098] In this embodiment, the raw materials of the bottom slurry include 38% of modified coffee grounds with a mesh size of 40 mesh, 27% of bamboo sawdust with a mesh size of 30 mesh, 15% of sugarcane leaf fibers with a length of 0.5 cm, and 15% of cellulose fibers with a length of 0.5 cm. 9131FC isocyanate adhesive 20%;

[0099] Calculated by mass percentage, the raw materials of the surface slurry include 15% of modified coffee grounds with a mesh size of 40 mesh, 10% of bamboo sawdust with a mesh size of 30 mesh, 20% of sugarcane leaf fibers with a length of 0.5 cm, 25% of yellow toner, and 9131FC isocyanate adhesive 30%;

[0100] Calculated by mass percentage, the raw materials of the modified coffee grounds in the bottom slurry and the surface slurry both include 93% coffee grounds and 7% succinic acid aqueous solution; calculated by mass ratio, the mixing ratio of succinic acid and water in the succinic acid aqueous solution is 1:2;

[0101] The method for preparing the high-strength and high-toughness artificial decorative board of this embodiment comprises the following steps:

[0102] A. Evenly mix the formulated amount of coffee grounds and the succinic acid aqueous solution, and sieve to obtain modified coffee grounds;

[0103] B. According to the formula of the bottom slurry, the modified coffee grounds, bamboo sawdust and 65% of the isocyanate adhesive are mixed evenly to obtain a first mixture; the sugarcane leaf fiber and 35% of the isocyanate adhesive are added to the first mixture and mixed evenly to obtain a bottom slurry;

[0104] C. According to the formula of the surface layer slurry, the modified coffee grounds, bamboo sawdust and 65% of the isocyanate adhesive are mixed evenly to obtain a second mixture; the sugarcane leaf fiber and 35% of the isocyanate adhesive are added to the second mixture and mixed evenly to obtain a base surface layer slurry;

[0105] D. adding yellow toner to the base surface slurry to obtain a surface slurry;

[0106] E. Inject the surface layer slurry into the mold to form the surface layer; inject the bottom layer slurry on the surface of the surface layer to form the bottom layer, and hot press mold it under the conditions of pressure of 2MPa and temperature of 120℃ for 15min, and then solidify it to obtain a high-strength and high-toughness artificial decorative board.

[0107] Comparative Example 1

[0108] The preparation method and raw materials of Comparative Example 1 are the same as those of Example 2, except that the modified coffee grounds in Comparative Example 1 are replaced with ordinary coffee grounds.

[0109] Comparative Example 2

[0110] Comparative Example 2 has the same preparation method and raw materials as Example 2, except that modified coffee grounds are not added in Comparative Example 2. That is, according to the mass percentage, the raw materials of the bottom slurry include 45% pine wood chips with a mesh size of 20 mesh, 30% straw fibers with a length of 1.5 cm and 9131FC isocyanate adhesive 25%; calculated by mass percentage, the raw materials of the surface slurry include 20% pine wood chips with a mesh size of 20 mesh, 25% straw fiber with a length of 1.5 cm, 20% blue toner and 9131FC isocyanate adhesive 35%.

[0111] The artificial decorative board was prepared by the preparation methods in the above embodiment and comparative example respectively, and the thickness was measured by using a vernier caliper. The performance of the artificial decorative board was tested according to the test standard of "GB / T 4897-2015 Particleboard", and the surface of the artificial stone was observed by naked eyes. The results are shown in Table 1 below.

[0112] Table 1 Test results of relevant properties of artificial decorative panels

[0113]

[0114] From the performance test results in Table 1, it can be seen that the surface of the artificial decorative board prepared by the preparation method of the technical solution is rich in color and has high aesthetics, and the elastic modulus of the prepared artificial decorative board is ≥1830MPa, the static bending strength is ≥15.4MPa, the internal bonding strength is ≥2.2MPa, and the surface bonding strength is ≥1.5MPa. Among them, the elastic modulus focuses on characterizing flexibility, while the static bending strength, internal bonding strength and surface bonding strength focus on characterizing strength. According to the test results, the strength and flexibility of the artificial decorative board in the technical solution are much higher than the strength of the P2 grade particle board of the same thickness in "GB / T 4897-2015 Particle Board", that is, the artificial decorative board prepared in the technical solution has both high strength and high flexibility.

[0115] In Comparative Example 1, since the modified coffee grounds are replaced with ordinary coffee grounds, the strength of the artificial decorative board decreases, and it is impossible to achieve both high strength and high toughness.

[0116] In Comparative Example 2, since modified coffee grounds were not added to the base slurry and the surface slurry formula, the strength of the artificial decorative board decreased, and it was impossible to achieve both high strength and high toughness at the same time.

[0117] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A high-strength and high-toughness artificial decorative board, characterized in that: It comprises a bottom layer and a surface layer arranged in sequence from bottom to top; the bottom layer is obtained by hot pressing and curing the bottom layer slurry, and the surface layer is obtained by hot pressing and curing the surface layer slurry; Calculated by mass percentage, the bottom slurry includes 30-40% of modified coffee grounds, 20-35% of sawdust, 5-20% of plant fiber and 10-20% of isocyanate adhesive; Calculated by mass percentage, the surface slurry includes 70-80% of color raw materials and 20-30% of isocyanate adhesive; The color raw materials include any one or a combination of multiple of modified coffee grounds, sawdust, plant fibers and color powder; The modified coffee grounds in the bottom slurry and the surface slurry both include coffee grounds and a succinic acid aqueous solution.

2. The high-strength and high-toughness artificial decorative board according to claim 1, characterized in that: Calculated by mass percentage, the modified coffee grounds in the bottom slurry and the surface slurry both include 93-98.5% of coffee grounds and 1.5-7% of succinic acid aqueous solution.

3. The high-strength and high-toughness artificial decorative board according to claim 1, characterized in that: The mesh numbers of the modified coffee grounds in the bottom slurry and the surface slurry are both 20-200 meshes, and the mesh numbers of the sawdust are both 20-30 meshes.

4. The high-strength and high-toughness artificial decorative board according to claim 1, characterized in that: The lengths of the plant fibers in the bottom slurry and the surface slurry are both 0.5 to 2 cm.

5. The high-strength and high-toughness artificial decorative board according to claim 1, characterized in that: Calculated by mass percentage, the moisture content of the modified coffee grounds, sawdust and plant fibers in the bottom slurry and the surface slurry is 10-15%.

6. The high-strength and high-toughness artificial decorative board according to claim 1, characterized in that: The plant fibers in the bottom slurry and the surface slurry include any one or more combinations of straw fibers, stalk fibers and sugarcane leaf fibers.

7. The high-strength and high-toughness artificial decorative board according to claim 1, characterized in that: The wood chips in the bottom slurry and the surface slurry include any one of bamboo wood chips and pine wood chips.

8. A method for preparing a high-strength and high-toughness artificial decorative board, characterized in that: The method for preparing the high-strength and high-toughness artificial decorative board according to any one of claims 1 to 7 comprises the following steps: A. Evenly mix the formulated amount of coffee grounds and the succinic acid aqueous solution, and sieve to obtain modified coffee grounds; B. According to the formula of the bottom slurry, the modified coffee grounds, sawdust and part of the isocyanate adhesive are mixed evenly to obtain a first mixture; the plant fiber and the remaining isocyanate adhesive are added to the first mixture and mixed evenly to obtain a bottom slurry; C. According to the formula of the surface layer slurry, the modified coffee grounds, sawdust and part of the isocyanate adhesive are mixed evenly to obtain a second mixture; the plant fiber and the remaining isocyanate adhesive are added to the second mixture and mixed evenly to obtain a base surface layer slurry; D. adding a formulated amount of toner to the base surface slurry to obtain a surface slurry; E. Injecting the surface layer slurry into the mold to form the surface layer; injecting the bottom layer slurry on the surface of the surface layer to form the bottom layer, and after hot pressing and curing, obtaining a high-strength and high-toughness artificial decorative board.

9. The method for preparing a high-strength and high-toughness artificial decorative board according to claim 8, characterized in that: In step E, the pressure of the hot pressing molding is 1-5 MPa, the temperature is 110-120° C., and the hot pressing time is 10-15 min.

10. The method for preparing a high-strength and high-toughness artificial decorative board according to claim 8, characterized in that: In step E, the static bending strength of the high-strength and high-toughness artificial decorative board is ≥15.4MPa, the elastic modulus is ≥1830MPa, the internal bonding strength is ≥2.2MPa, and the surface bonding strength is ≥1.5MPa.

Images