Jasmine artificial board and preparation method thereof

Abstract

This invention provides a jasmine-patterned engineered wood panel and its preparation method, belonging to the field of engineered wood panel technology. The jasmine-patterned engineered wood panel includes a top layer, a middle layer, and a bottom layer, which are formed by hot pressing. The preparation method of the jasmine-patterned engineered wood panel includes the following steps: (1) placing wood shavings in a drying drum at a temperature of 110-130℃ and drying them until the moisture content of the wood shavings is 2-3%; (2) placing the dried wood shavings in a glue mixer, spraying jasmine fragrance agent and adhesive sequentially, stirring evenly for 5-8 minutes at a speed of 45-50 r / min to obtain a premix, and laying it into a board blank; (3) compacting the board blank and transferring it to a vulcanizing machine for three-stage hot pressing, then removing it and cooling it to obtain the jasmine-patterned engineered wood panel. In this invention, spraying jasmine fragrance agent and adhesive on the wood shavings facilitates the penetration of the jasmine fragrance agent and adhesive into the interior, improves the flame retardant performance of the engineered wood panel, enhances the strength of the engineered wood panel, and makes the engineered wood panel have a jasmine fragrance while having more stable quality.

Description

Technical Field

[0001] This invention relates to the field of engineered wood products technology, and in particular to a jasmine-patterned engineered wood product and its preparation method. Background Technology

[0002] The demand for timber has been increasing year by year, and developing the engineered wood-based panel industry is a major way to improve timber utilization and conserve timber resources. Engineered wood-based panels are made from timber or other non-timber materials, which are mechanically processed into various unit materials and then bonded together with chemical adhesives under temperature and pressure. Depending on the plant material used, they can be further classified into plywood, particleboard, fiberboard, etc. The advent of engineered wood-based panels marked the beginning of the modern era of timber processing, transforming the process from simply changing the shape of timber to improving its properties.

[0003] Currently, in the processing technology of engineered wood products, a large amount of adhesive is required to bond wood or other non-wood plant material particles together. Adhesives mainly include natural adhesives and synthetic adhesives, including resin adhesives. Because natural adhesives have low bonding strength, the resulting engineered wood products have poor mechanical properties. Therefore, most engineered wood products use synthetic adhesives, with resin adhesives being the most common. These resin adhesives have low bonding performance and poor flame retardant properties, making the engineered wood products they produce unable to meet usage requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a jasmine-patterned artificial board and its preparation method, thereby solving the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A jasmine-patterned engineered wood panel comprising a top layer, a middle layer, and a bottom layer, wherein the top layer, middle layer, and bottom layer are formed by hot pressing.

[0007] Furthermore, jasmine engineered wood panels include the following raw materials: wood shavings, jasmine fragrance, and adhesives.

[0008] Furthermore, the wood shavings are 15-20mm long, 8-10mm wide, and 0.5-0.6mm thick, with a moisture content of 8% to 10%.

[0009] Furthermore, the adhesive comprises the following raw materials: metakaolin, epoxy resin, polyamide, γ-aminopropyltriethoxysilane and alkali activator, in a mass ratio of 8-12:0.62-2.74:0.16-0.69:0.129-0.143:13-17.

[0010] Furthermore, the preparation method of the adhesive includes the following steps: mixing an alkali activator with metakaolin for alkali activation, stirring for 80 seconds at a speed of 280 r / min, and then sequentially adding epoxy resin, polyamide, and γ-aminopropyltriethoxysilane to obtain the adhesive.

[0011] Metakaolin is anhydrous aluminum silicate formed by dehydrating kaolin at high temperatures of 600–900℃.

[0012] Furthermore, the preparation method of the alkali activator is as follows: Weigh out liquid sodium silicate and solid sodium hydroxide, mix them, stir in a coagulation tester for 3 minutes at a speed of R = 150 r / min, stop stirring when the mixture becomes a white turbid liquid, and let it stand and cool naturally to room temperature for later use.

[0013] Liquid sodium silicate and sodium hydroxide are mixed to form an alkaline activator, which provides the necessary activation conditions for the reaction of active metakaolin at room temperature.

[0014] A method for preparing a jasmine-patterned engineered wood panel includes the following steps:

[0015] (1) Place the wood shavings in a drying drum at a temperature of 110-130℃ and dry them until the moisture content of the wood shavings is 2-3%.

[0016] (2) Put the dried wood shavings into a mixing machine, spray jasmine fragrance and adhesive in a measured amount, rotate at 45-50 r / min, stir evenly for 5-8 min to obtain a premix, and lay it into a board blank.

[0017] (3) After the slab is compacted, it is moved into the vulcanizing machine for three-stage hot pressing, and then taken out and cooled to obtain jasmine artificial board.

[0018] Furthermore, in step (2), the slab is divided into a top layer, a middle layer and a bottom layer, with the particle size ratio of each layer being 1:1:1.

[0019] Furthermore, in step (3), the hot pressing temperature is 160-180℃.

[0020] Furthermore, in step (3), the hot pressing pressures are 7-8, 4-5, and 1-2 MPa, and the hot pressing times are 2, 3, and 5 min, respectively.

[0021] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0022] 1. In this invention, metakaolin activated by an alkali activator has excellent mechanical and durability properties. When epoxy resin and polyamide are added, the viscosity of the slurry is low, which is beneficial for uniform sizing.

[0023] 2. In this invention, γ-aminopropyltriethoxysilane is soluble in water and is used to couple organic polymers and inorganic fillers, enhancing their adhesion and improving the mechanical, water-resistant, and anti-aging properties of the product. γ-aminopropyltriethoxysilane can hydrolyze to generate Si-OH, which reacts with the terminal hydroxyl groups of metakaolin after alkali activation to form Si-O-Si bonds. The silanol groups generated after the hydrolysis of γ-aminopropyltriethoxysilane successfully combine with the metakaolin skeleton structure, playing a bridging role between organic and inorganic components. Under the action of polyamide, the epoxy ring of the epoxy resin opens and forms a dense structure with the alkali-activated metakaolin through hydrogen bonds, improving the adhesive performance of the adhesive.

[0024] 3. In this invention, the adhesive prepared by using γ-aminopropyltriethoxysilane, epoxy resin and alkali-activated metakaolin effectively improves the bonding performance and flame retardant performance of the adhesive. At the same time, the jasmine fragrance agent is sprayed, and the resulting artificial board has a jasmine fragrance. The jasmine artificial board prepared meets the requirements for use.

[0025] 4. In this invention, jasmine fragrance and adhesive are sprayed onto wood shavings, which facilitates the penetration of the jasmine fragrance and adhesive into the interior, improves the flame retardant properties of the engineered wood, enhances the strength of the engineered wood, and makes the engineered wood have a jasmine fragrance while being more stable in quality. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, preferred embodiments are described below to further illustrate the invention in detail. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the invention, and these aspects can be achieved even without these specific details.

[0027] Example 1

[0028] A jasmine-scented engineered wood panel comprises a top layer, a middle layer, and a bottom layer, which are formed by hot pressing. The jasmine-scented engineered wood panel includes the following raw materials: wood shavings, jasmine fragrance, and adhesive. The wood shavings are 15mm long, 8mm wide, and 0.5mm thick, with a moisture content of 8%–10%.

[0029] The adhesive comprises the following raw materials: meta-kaolin, epoxy resin, polyamide, γ-aminopropyltriethoxysilane and alkali activator, in a mass ratio of 8-12:0.62-2.74:0.16-0.69:0.129-0.143:13-17.

[0030] The adhesive preparation method includes the following steps: Alkali activator is mixed with metakaolin and alkali-activated, stirred for 80 seconds at a speed of 280 r / min, and then epoxy resin, polyamide, and γ-aminopropyltriethoxysilane are added sequentially to obtain the adhesive. The adhesive prepared using γ-aminopropyltriethoxysilane, epoxy resin, and alkali-activated metakaolin effectively improves the adhesive's bonding and flame-retardant properties. The metakaolin activated with the alkali activator exhibits excellent mechanical and durability properties. When epoxy resin and polyamide are added, the slurry viscosity is low, which is beneficial for uniform application.

[0031] Metakaolin is anhydrous aluminum silicate formed by dehydrating kaolin at high temperatures of 600–900℃. γ-aminopropyltriethoxysilane is water-soluble and used to couple organic polymers and inorganic fillers, enhancing their adhesion and improving the mechanical, water-resistant, and anti-aging properties of the product. γ-aminopropyltriethoxysilane can hydrolyze to generate Si-OH, which reacts with the terminal hydroxyl groups of alkali-activated metakaolin to form Si-O-Si bonds. Under the action of polyamide, the epoxy ring of the epoxy resin opens, forming a dense structure with the alkali-activated metakaolin through hydrogen bonds, thus improving the adhesive's bonding performance.

[0032] The preparation method of the alkali activator is as follows: Weigh out liquid sodium silicate and solid sodium hydroxide, mix them, stir in a coagulation tester for 3 minutes at a speed of R = 150 r / min, stop stirring when the mixture becomes a white turbid liquid, and let it stand and cool naturally to room temperature for later use. The mixture of liquid sodium silicate and sodium hydroxide forms an alkali activator, which provides the necessary activation conditions for the reaction of activated metakaolin at room temperature.

[0033] A method for preparing a jasmine-patterned engineered wood panel includes the following steps:

[0034] (1) Place the wood shavings in a drying drum at a temperature of 110℃ and dry them until the moisture content of the wood shavings is 2-3%;

[0035] (2) Place the dried wood shavings into a mixing machine, spray jasmine fragrance agent and adhesive in a measured amount, rotate at 45 r / min, stir evenly for 5 min to obtain a premix, and lay it into a board blank; the board blank is divided into a top layer, a middle layer and a bottom layer, and the wood shavings mass ratio of each layer is 1:1:1; spray jasmine fragrance agent and adhesive on the wood shavings to facilitate the penetration of jasmine fragrance agent and adhesive into its interior, improve the flame retardant performance of the artificial board, enhance the strength of the artificial board, and make the artificial board have jasmine fragrance while having more stable quality;

[0036] (3) After compacting the slab, it is moved into the vulcanizing machine for three-stage hot pressing, and then taken out and cooled to obtain jasmine artificial board; the hot pressing temperature is 160℃; the hot pressing pressure is 7, 4 and 1MPa respectively, and the hot pressing time is 2, 3 and 5min respectively.

[0037] Example 2

[0038] A jasmine-scented engineered wood panel comprises a top layer, a middle layer, and a bottom layer, which are formed by hot pressing. The jasmine-scented engineered wood panel includes the following raw materials: wood shavings, jasmine fragrance, and adhesive. The wood shavings are 20mm long, 10mm wide, and 0.6mm thick, with a moisture content of 8%–10%.

[0039] The adhesive comprises the following raw materials: meta-kaolin, epoxy resin, polyamide, γ-aminopropyltriethoxysilane and alkali activator, in a mass ratio of 8-12:0.62-2.74:0.16-0.69:0.129-0.143:13-17.

[0040] The adhesive preparation method includes the following steps: Alkali activator is mixed with metakaolin and alkali-activated, stirred for 80 seconds at a speed of 280 r / min, and then epoxy resin, polyamide, and γ-aminopropyltriethoxysilane are added sequentially to obtain the adhesive. The adhesive prepared using γ-aminopropyltriethoxysilane, epoxy resin, and alkali-activated metakaolin effectively improves the adhesive's bonding and flame-retardant properties. The metakaolin activated with the alkali activator exhibits excellent mechanical and durability properties. When epoxy resin and polyamide are added, the slurry viscosity is low, which is beneficial for uniform application.

[0041] Metakaolin is anhydrous aluminum silicate formed by dehydrating kaolin at high temperatures of 600–900℃. γ-aminopropyltriethoxysilane is water-soluble and used to couple organic polymers and inorganic fillers, enhancing their adhesion and improving the mechanical, water-resistant, and anti-aging properties of the product. γ-aminopropyltriethoxysilane can hydrolyze to generate Si-OH, which reacts with the terminal hydroxyl groups of alkali-activated metakaolin to form Si-O-Si bonds. Under the action of polyamide, the epoxy ring of the epoxy resin opens, forming a dense structure with the alkali-activated metakaolin through hydrogen bonds, thus improving the adhesive's bonding performance.

[0042] The preparation method of the alkali activator is as follows: Weigh out liquid sodium silicate and solid sodium hydroxide, mix them, stir in a coagulation tester for 3 minutes at a speed of R = 150 r / min, stop stirring when the mixture becomes a white turbid liquid, and let it stand and cool naturally to room temperature for later use. The mixture of liquid sodium silicate and sodium hydroxide forms an alkali activator, which provides the necessary activation conditions for the reaction of activated metakaolin at room temperature.

[0043] A method for preparing a jasmine-patterned engineered wood panel includes the following steps:

[0044] (1) Place the wood shavings in a drying drum at a temperature of 130℃ and dry them until the moisture content of the wood shavings is 2-3%;

[0045] (2) Place the dried wood shavings into a glue mixer, spray jasmine fragrance agent and adhesive in a measured amount, rotate at 50 r / min, stir evenly for 8 min to obtain a premix, and lay it into a board blank; the board blank is divided into a top layer, a middle layer and a bottom layer, and the wood shavings mass ratio of each layer is 1:1:1; spray jasmine fragrance agent and adhesive on the wood shavings to facilitate the penetration of jasmine fragrance agent and adhesive into its interior, improve the flame retardant performance of the artificial board, enhance the strength of the artificial board, and make the artificial board have jasmine fragrance while having more stable quality;

[0046] (3) After compacting the slab, it is moved into the vulcanizing machine for three-stage hot pressing, and then taken out and cooled to obtain jasmine artificial board; the hot pressing temperature is 180℃; the hot pressing pressure is 8, 5 and 2MPa respectively, and the hot pressing time is 2, 3 and 5min respectively.

[0047] Example 3

[0048] A jasmine-scented engineered wood panel comprises a top layer, a middle layer, and a bottom layer, which are formed by hot pressing. The jasmine-scented engineered wood panel includes the following raw materials: wood shavings, jasmine fragrance, and adhesive. The wood shavings are 18 mm long, 9 mm wide, and 0.55 mm thick, with a moisture content of 8%–10%.

[0049] The adhesive comprises the following raw materials: meta-kaolin, epoxy resin, polyamide, γ-aminopropyltriethoxysilane and alkali activator, in a mass ratio of 8-12:0.62-2.74:0.16-0.69:0.129-0.143:13-17.

[0050] The adhesive preparation method includes the following steps: Alkali activator is mixed with metakaolin and alkali-activated, stirred for 80 seconds at a speed of 280 r / min, and then epoxy resin, polyamide, and γ-aminopropyltriethoxysilane are added sequentially to obtain the adhesive. The adhesive prepared using γ-aminopropyltriethoxysilane, epoxy resin, and alkali-activated metakaolin effectively improves the adhesive's bonding and flame-retardant properties. The metakaolin activated with the alkali activator exhibits excellent mechanical and durability properties. When epoxy resin and polyamide are added, the slurry viscosity is low, which is beneficial for uniform application.

[0051] Metakaolin is anhydrous aluminum silicate formed by dehydrating kaolin at high temperatures of 600–900℃. γ-aminopropyltriethoxysilane is water-soluble and used to couple organic polymers and inorganic fillers, enhancing their adhesion and improving the mechanical, water-resistant, and anti-aging properties of the product. γ-aminopropyltriethoxysilane can hydrolyze to generate Si-OH, which reacts with the terminal hydroxyl groups of alkali-activated metakaolin to form Si-O-Si bonds. Under the action of polyamide, the epoxy ring of the epoxy resin opens, forming a dense structure with the alkali-activated metakaolin through hydrogen bonds, thus improving the adhesive's bonding performance.

[0052] The preparation method of the alkali activator is as follows: Weigh out liquid sodium silicate and solid sodium hydroxide, mix them, stir in a coagulation tester for 3 minutes at a speed of R = 150 r / min, stop stirring when the mixture becomes a white turbid liquid, and let it stand and cool naturally to room temperature for later use. The mixture of liquid sodium silicate and sodium hydroxide forms an alkali activator, which provides the necessary activation conditions for the reaction of activated metakaolin at room temperature.

[0053] A method for preparing a jasmine-patterned engineered wood panel includes the following steps:

[0054] (1) Place the wood shavings in a drying drum at a temperature of 120℃ and dry them until the moisture content of the wood shavings is 2-3%;

[0055] (2) Place the dried wood shavings into a glue mixer, spray jasmine fragrance agent and adhesive in a measured amount, rotate at 48 r / min, stir evenly for 7 min to obtain a premix, and lay it into a board blank; the board blank is divided into a top layer, a middle layer and a bottom layer, and the wood shavings mass ratio of each layer is 1:1:1; spray jasmine fragrance agent and adhesive on the wood shavings to facilitate the penetration of jasmine fragrance agent and adhesive into its interior, improve the flame retardant performance of the artificial board, enhance the strength of the artificial board, and make the artificial board have jasmine fragrance while having more stable quality;

[0056] (3) After compacting the slab, it is moved into the vulcanizing machine for three-stage hot pressing, and then taken out and cooled to obtain jasmine artificial board; the hot pressing temperature is 180℃; the hot pressing pressure is 8, 5 and 2MPa respectively, and the hot pressing time is 2, 3 and 5min respectively.

[0057] Comparative Example 1

[0058] It is basically the same as Example 3, except that γ-aminopropyltriethoxysilane was not added to the raw materials of the adhesive.

[0059] Comparative Example 2

[0060] The results are basically the same as in Example 3, except that epoxy resin and polyamide were not added to the raw materials of the adhesive, and the metakaolin was not activated by alkali.

[0061] Comparative Example 3

[0062] It is basically the same as Example 3, except that epoxy resin and polyamide are not added to the raw materials of the adhesive.

[0063] Comparative Example 4

[0064] It is basically the same as Example 3, except that the metakaolin in the raw materials of the adhesive has not been alkali activated.

[0065] Performance testing

[0066] The engineered wood panels obtained in Examples 1-3 and Comparative Examples 1-4 were subjected to bonding strength tests according to the requirements of GB / T9846-2015 standard for ordinary plywood, and static bending strength and modulus of elasticity were tested under a nominal thickness of 15mm < t ≤ 21mm. The results are shown in Table 1.

[0067] Results of performance tests of wood-based panels in Examples 1-3 and Comparative Examples 1-4

[0068]

[0069]

[0070] (1) As shown in Table 1, when the adhesive prepared by the adhesive of the present invention is applied, all the indicators of the plywood are far higher than the standard requirements.

[0071] (2) Compared with Comparative Example 2, the adhesive prepared in Comparative Example 2 did not contain epoxy resin and polyamide, and the metakaolin was not activated by alkali. The adhesive strength of Comparative Example 2 decreased by 0.98 MPa, the static bending strength parallel to the grain decreased by 7.3 MPa, the static bending strength transverse to the grain decreased by 8.7 MPa, the elastic modulus parallel to the grain decreased by 400 MPa, and the elastic modulus transverse to the grain decreased by 400 MPa.

[0072] (3) Compared with Comparative Example 2, Comparative Example 3 did not add epoxy resin and polyamide to the raw materials for preparing the adhesive, while Comparative Example 2 did not add epoxy resin and polyamide to the raw materials for preparing the adhesive, and the metakaolin was not activated by alkali. The adhesive strength of Comparative Example 2 decreased by 0.38 MPa, the static bending strength parallel to the grain decreased by 3.1 MPa, the static bending strength transverse to the grain decreased by 3.7 MPa, the elastic modulus parallel to the grain decreased by 100 MPa, and the elastic modulus transverse to the grain decreased by 120 MPa.

[0073] (4) Compared with Comparative Example 2, the raw materials for preparing the adhesive in Comparative Example 4 were not alkali-activated, while the raw materials for preparing the adhesive in Comparative Example 2 were not epoxy resin and polyamide, and the raw materials were not alkali-activated. The bonding strength of Comparative Example 2 decreased by 0.48 MPa, the static bending strength parallel to the grain decreased by 3.3 MPa, the static bending strength transverse to the grain decreased by 4.0 MPa, the elastic modulus parallel to the grain decreased by 250 MPa, and the elastic modulus transverse to the grain decreased by 230 MPa.

[0074] (5) Therefore, it can be calculated that the combined effect of epoxy resin and polyamide, and metakaolin without alkali activation, is better than when the two are used separately.

[0075] Bond strength improvement: [0.98(0.38+0.48)] / (0.38+0.48)*100%=14.0%;

[0076] Static bending strength along the grain increased by: [7.3(3.1+3.3)] / (3.1+3.3)]*100%=14.1%;

[0077] Horizontal lines increase: [8.7(3.7+4.0)] / (3.7+4.0)*100%=13.0%;

[0078] Elastic modulus increase along the grain: [400(100+250)] / (100+250)*100%=14.3%;

[0079] Horizontal lines increase: [400(120+230)] / (120+230)*100%=14.3%.

[0080] It is evident that the combined use of epoxy resin and polyamide with metakaolin after alkali activation can synergistically enhance the adhesive, effectively improving the bonding strength, static bending strength, and modulus of elasticity of engineered wood products. This is because: metakaolin activated with an alkali activator possesses excellent mechanical and durability properties; when epoxy resin and polyamide are added, the slurry viscosity is low, which facilitates uniform application; under the action of polyamide, the epoxy rings of the epoxy resin open, forming a dense structure with the alkali-activated metakaolin through hydrogen bonds, thus improving the adhesive's bonding performance.

[0081] The epoxy resin-modified metakaolin has excellent bonding, flame retardant and environmental performance. The flame retardant performance has been improved to a certain extent. The formaldehyde emission of the resulting engineered wood product is 0.031 mg, which meets the requirements for use.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a jasmine-patterned artificial board, characterized in that: Includes the following steps: (1) Place the wood shavings in a drying drum at a temperature of 110-130℃ and dry them until the moisture content of the wood shavings is 2-3%; (2) Place the dried wood shavings into a mixing machine, spray jasmine fragrance and adhesive in a measured amount, rotate at 45-50 r / min, stir evenly for 5-8 min to obtain a premix, and lay it into a board blank; (3) After the slab is compacted, it is moved into the vulcanizing machine for three-stage hot pressing, and then taken out and cooled to obtain jasmine artificial board; Jasmine-patterned engineered wood panels consist of a top layer, a middle layer, and a bottom layer, which are formed by hot pressing. Jasmine-based engineered wood panels include the following raw materials: wood shavings, jasmine fragrance, and adhesives; The adhesive comprises the following raw materials: metakaolin, epoxy resin, polyamide, γ-aminopropyltriethoxysilane and alkali activator, in a mass ratio of 8-12:0.62-2.74:0.16-0.69:0.129-0.143:13-17; The preparation method of the adhesive includes the following steps: mixing an alkali activator with metakaolin for alkali activation, high-speed shearing for 80s at a rotation speed of 280r / min, and sequentially adding epoxy resin, polyamide, and γ-aminopropyltriethoxysilane to obtain the adhesive. The preparation method of the alkali activator is as follows: Weigh out liquid sodium silicate and solid sodium hydroxide, mix them, stir in a coagulation tester for 3 minutes at a speed of R=150r / min, stop stirring when the mixture becomes a white turbid liquid, and let it stand and cool naturally to room temperature for later use.

2. The method for preparing a jasmine-patterned artificial board according to claim 1, characterized in that: The wood shavings are 15-20mm long, 8-10mm wide, and 0.5-0.6mm thick, with a moisture content of 8% to 10%.

3. The method for preparing a jasmine-patterned artificial board according to claim 1, characterized in that: In step (2), the slab is divided into a top layer, a middle layer and a bottom layer, with the particle size ratio of each layer being 1:1:

1.

4. The method for preparing a jasmine-patterned artificial board according to claim 1, characterized in that: In step (3), the hot pressing temperature is 160-180℃.

5. The method for preparing a jasmine-patterned artificial board according to claim 1, characterized in that: In step (3), the hot pressing pressures are 7-8, 4-5, and 1-2 MPa, and the hot pressing times are 2, 3, and 5 min, respectively.

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