High-strength eco-friendly plate and preparation method thereof

Abstract

This invention relates to the field of board technology, and proposes a high-strength eco-friendly board and its preparation method. The eco-friendly board, from top to bottom, comprises a first decorative paper layer, a first reinforcing layer, a substrate layer, a second reinforcing layer, and a second decorative paper layer. The first and second reinforcing layers each independently comprise the following components by weight: 70 parts silica sol, 12-20 parts magnesia fiber, 15-25 parts silica fume, 3-5 parts zinc stearate, and 5-10 parts binder; the binder includes polylactic acid and borate; the weight ratio of polylactic acid to borate is 1:9 to 9:1. This technical solution solves the problem of poor strength performance in eco-friendly boards in related technologies.

Description

Technical Field

[0001] This invention relates to the field of sheet metal technology, specifically to a high-strength eco-friendly sheet metal and its preparation method. Background Technology

[0002] Eco-friendly boards are a type of engineered wood or natural wood boards with environmentally friendly properties. They are typically made from renewable resources such as natural wood and crop straw as the main raw materials, supplemented with environmentally friendly adhesives, and processed through special techniques.

[0003] Engineered wood products are made primarily of wood or non-wood plant fiber materials, processed through mechanical steps, and bonded together with resin or other adhesives that do not contain formaldehyde or free phenol. The resulting boards or molded products vary significantly in type and properties due to differences in materials, additives, and pressing processes. Currently, green and environmentally friendly engineered wood products offer advantages over ordinary boards, containing no harmful substances and adhering to higher production standards. They are more versatile and widely used in construction, furniture, and decoration. However, despite their superior properties, these products also have limitations in strength. Under heavy pressure, they are prone to showing marks, deformation, and cracking, restricting their application in environments requiring heavy loads.

[0004] Therefore, improving the strength performance of eco-friendly building materials is of great significance for expanding the application range and extending the service life of these materials. Summary of the Invention

[0005] This invention proposes a high-strength eco-friendly board and its preparation method, which solves the problem of poor strength performance of eco-friendly boards in related technologies.

[0006] The technical solution of the present invention is as follows:

[0007] This invention proposes a high-strength, eco-friendly board material, which, from top to bottom, comprises a first decorative paper layer, a first reinforcing layer, a substrate layer, a second reinforcing layer, and a second decorative paper layer. The first reinforcing layer and the second reinforcing layer each independently comprise the following components in parts by weight:

[0008] 70 parts silica sol, 12-20 parts brucite fiber, 15-25 parts silica fume, 3-5 parts zinc stearate, and 5-10 parts binder;

[0009] The binder includes polylactic acid and borate;

[0010] The weight ratio of polylactic acid to borate is 1:9 to 9:1.

[0011] As a further technical solution, the weight ratio of polylactic acid to borate is 2~3:2.

[0012] When the weight ratio of polylactic acid to borate is 2~3:2, the strength performance of eco-friendly boards can be further improved.

[0013] As a further technical solution, the borate includes one or more of zinc borate, sodium borate, and sodium metaborate.

[0014] As a further technical solution, when the borate includes zinc borate and sodium metaborate, the weight ratio of zinc borate to sodium metaborate is 3:2.

[0015] As a further technical solution, the silica fume is polyvinyl acetate modified silica fume, and the raw materials of the polyvinyl acetate modified silica fume include silica fume and polyvinyl acetate.

[0016] In this invention, polyvinyl acetate is used to modify silica fume, which makes the silica fume more evenly dispersed in the reinforcing layer, thereby better filling the tiny gaps between the components, making the structure of the reinforcing layer more compact and stable, and thus further improving the strength performance of the eco-friendly board.

[0017] As a further technical solution, the weight ratio of silica fume to polyvinyl acetate is 30:2~3.

[0018] When the weight ratio of silica fume to polyvinyl acetate is 30:2~3, the strength performance of eco-friendly boards can be further improved.

[0019] As a further technical solution, the preparation method of the polyvinyl acetate modified silica powder includes the following steps: dispersing the polyvinyl acetate and silica powder evenly in ethanol, drying, and obtaining the polyvinyl acetate modified silica powder.

[0020] As a further technical solution, the particle size of the silica fume is 1~20μm.

[0021] As a further technical solution, the material of the substrate layer is wood, and the wood is wood that has undergone drying treatment.

[0022] As a further technical solution, the moisture content in the dried wood is 6wt%~12wt%.

[0023] As a further technical solution, the first decorative paper layer and the second decorative paper layer each independently include one of white wood grain decorative paper and maple wood grain decorative paper.

[0024] This invention also proposes a method for preparing a high-strength, eco-friendly building material, comprising the following steps:

[0025] S1. Mix the components of the first reinforcing layer evenly to obtain the first mixed slurry;

[0026] S2. Mix the components of the second reinforcing layer evenly to obtain the second mixed slurry;

[0027] S3. The first mixed slurry and the second mixed slurry are respectively coated on the upper surface and the lower surface of the substrate layer and dried to obtain a substrate layer with a first reinforcing layer on the upper surface and a second reinforcing layer on the lower surface.

[0028] S4. Press a first decorative paper layer onto the upper surface of the first reinforcing layer and press a second decorative paper layer onto the lower surface of the second reinforcing layer to obtain an eco-friendly board material consisting of a first decorative paper layer, a first reinforcing layer, a substrate layer, a second reinforcing layer, and a second decorative paper layer from top to bottom.

[0029] As a further technical solution, in step S3, the drying process is carried out at a temperature of 90~100℃ for 4~5 hours.

[0030] As a further technical solution, the thickness of the first reinforcing layer and the second reinforcing layer are each independently 0.8~1.2mm.

[0031] The working principle and beneficial effects of this invention are as follows:

[0032] In this invention, the eco-friendly board comprises, from top to bottom, a first reinforcing layer, a substrate layer, and a second reinforcing layer. Each of the first and second reinforcing layers independently uses silica sol as the main material, combined with magnesium hydroxide fiber, silica fume, zinc stearate, and a binder. This results in a dense and stable reinforcing layer. The upper and lower reinforcing layers strengthen the overall structure of the board, improving its stability. Furthermore, they distribute stress under external forces, providing excellent protection and reinforcement for the intermediate substrate layer. This results in superior overall mechanical properties of the board, reducing the likelihood of deformation and cracking. Simultaneously, the resulting eco-friendly board has low formaldehyde emissions, meeting green environmental protection requirements. The binder includes polylactic acid and borate. Through the synergistic effect of polylactic acid and borate, the bonding advantages are fully utilized, ensuring a tight bond between the components. This prevents the reinforcing layer from detaching and also improves the overall strength of the board. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] In the following examples and comparative examples, the silica sol is model ZS-40 with a silica content of 40wt%; the brucite fiber has a pile length of 3mm, with a calcium oxide content of 16wt% and a magnesium oxide content of 12wt%; the silica fume has a particle size of 10μm; the polylactic acid is model FY801; the polyvinyl acetate is model N100; the substrate layer is made of dried wood with a moisture content of 8wt% and a thickness of 6mm; the first and second reinforcing layers have a thickness of 1mm; the first and second decorative paper layers are made of white wood grain decorative paper with a thickness of 0.12mm.

[0035] Example 1

[0036] A high-strength, eco-friendly board material, comprising, from top to bottom, a first decorative paper layer, a first reinforcing layer, a substrate layer, a second reinforcing layer, and a second decorative paper layer. The first and second reinforcing layers each independently comprise the following components in parts by weight:

[0037] 70 parts silica sol, 12 parts brucite fiber, 15 parts silica fume, 3 parts zinc stearate, and 5 parts binder;

[0038] The binder comprises 0.5 parts polylactic acid and 4.5 parts borate;

[0039] The borates are zinc borate and sodium metaborate in a weight ratio of 3:2;

[0040] Its preparation method includes the following steps:

[0041] S1. Mix the components of the first reinforcing layer evenly to obtain the first mixed slurry;

[0042] S2. Mix the components of the second reinforcing layer evenly to obtain the second mixed slurry;

[0043] S3. The first mixed slurry and the second mixed slurry are respectively coated on the upper surface and the lower surface of the substrate layer and dried at 90°C for 5 hours to obtain a substrate layer with the first reinforcing layer on the upper surface and the second reinforcing layer on the lower surface.

[0044] S4. Press the first decorative paper layer onto the upper surface of the first reinforcing layer, and press the second decorative paper layer onto the lower surface of the second reinforcing layer to obtain an eco-friendly board material consisting of the first decorative paper layer, the first reinforcing layer, the substrate layer, the second reinforcing layer, and the second decorative paper layer from top to bottom.

[0045] Example 2

[0046] A high-strength, eco-friendly board material, comprising, from top to bottom, a first decorative paper layer, a first reinforcing layer, a substrate layer, a second reinforcing layer, and a second decorative paper layer. The first and second reinforcing layers each independently comprise the following components in parts by weight:

[0047] 70 parts silica sol, 16 parts brucite fiber, 20 parts silica fume, 4 parts zinc stearate, and 8 parts binder;

[0048] The binder consists of 3 parts polylactic acid and 5 parts borate;

[0049] The borates are zinc borate and sodium metaborate in a weight ratio of 3:2;

[0050] Its preparation method includes the following steps:

[0051] S1. Mix the components of the first reinforcing layer evenly to obtain the first mixed slurry;

[0052] S2. Mix the components of the second reinforcing layer evenly to obtain the second mixed slurry;

[0053] S3. The first mixed slurry and the second mixed slurry are respectively coated on the upper surface and the lower surface of the substrate layer, and dried at 95°C for 4.5 hours to obtain a substrate layer with the first reinforcing layer on the upper surface and the second reinforcing layer on the lower surface.

[0054] S4. Press the first decorative paper layer onto the upper surface of the first reinforcing layer, and press the second decorative paper layer onto the lower surface of the second reinforcing layer to obtain an eco-friendly board material consisting of the first decorative paper layer, the first reinforcing layer, the substrate layer, the second reinforcing layer, and the second decorative paper layer from top to bottom.

[0055] Example 3

[0056] A high-strength, eco-friendly board material, comprising, from top to bottom, a first decorative paper layer, a first reinforcing layer, a substrate layer, a second reinforcing layer, and a second decorative paper layer. The first and second reinforcing layers each independently comprise the following components in parts by weight:

[0057] 70 parts silica sol, 20 parts brucite fiber, 25 parts silica fume, 5 parts zinc stearate, and 10 parts binder;

[0058] The binder consists of 9 parts polylactic acid and 1 part borate;

[0059] The borates are zinc borate and sodium metaborate in a weight ratio of 3:2;

[0060] Its preparation method includes the following steps:

[0061] S1. Mix the components of the first reinforcing layer evenly to obtain the first mixed slurry;

[0062] S2. Mix the components of the second reinforcing layer evenly to obtain the second mixed slurry;

[0063] S3. The first mixed slurry and the second mixed slurry are respectively coated on the upper surface and the lower surface of the substrate layer and dried at 100°C for 4 hours to obtain a substrate layer with the first reinforcing layer on the upper surface and the second reinforcing layer on the lower surface.

[0064] S4. Press the first decorative paper layer onto the upper surface of the first reinforcing layer, and press the second decorative paper layer onto the lower surface of the second reinforcing layer to obtain an eco-friendly board material consisting of the first decorative paper layer, the first reinforcing layer, the substrate layer, the second reinforcing layer, and the second decorative paper layer from top to bottom.

[0065] Example 4

[0066] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the adhesive includes 6 parts polylactic acid and 2 parts borate.

[0067] Example 5

[0068] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the adhesive includes 4 parts polylactic acid and 4 parts borate.

[0069] Example 6

[0070] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the binder includes 4.8 parts of polylactic acid and 3.2 parts of borate.

[0071] Example 7

[0072] The only difference between this embodiment and Embodiment 6 is that in this embodiment, the silica powder is polyvinyl acetate modified silica powder, and its preparation method includes the following steps: dispersing 1 part of polyvinyl acetate and 30 parts of silica powder evenly in 35 parts of ethanol, drying, and obtaining polyvinyl acetate modified silica powder.

[0073] Example 8

[0074] The only difference between this embodiment and Embodiment 7 is that, in this embodiment, 4 parts of polyvinyl acetate are added during the preparation of polyvinyl acetate modified silica powder.

[0075] Example 9

[0076] The only difference between this embodiment and Embodiment 7 is that, in this embodiment, 2 parts of polyvinyl acetate are added during the preparation of polyvinyl acetate modified silica powder.

[0077] Example 10

[0078] The only difference between this embodiment and Embodiment 7 is that, in this embodiment, 3 parts of polyvinyl acetate are added during the preparation of polyvinyl acetate modified silica powder.

[0079] Comparative Example 1

[0080] The only difference between this comparative example and Example 1 is that in this comparative example, the binder consists of only 5 parts of polylactic acid.

[0081] Comparative Example 2

[0082] The only difference between this comparative example and Example 1 is that in this comparative example, the binder consists of only 5 parts of borate, which is zinc borate and sodium metaborate in a weight ratio of 3:2.

[0083] Comparative Example 3

[0084] The only difference between this comparative example and Example 1 is that no binder was added in this comparative example.

[0085] Experiment Example 1: Formaldehyde Emission Test

[0086] The eco-friendly boards prepared in Examples 1-3 were tested for formaldehyde emission according to the method in GB / T 39600-2021 "Classification of Formaldehyde Emission from Wood-based Panels and Their Products". During the test, a 1m... 3 Climate chamber method, test standard is E NF ≤0.025mg / m 3 The plate sample was 500 mm long and 500 mm wide. The test result was the average of four samples, accurate to 0.001 mg / m³. 3 The test results are shown in Table 1 below:

[0087] Table 1 Formaldehyde emission test results for Examples 1-3

[0088]

[0089] As shown in Table 1, the formaldehyde release of the eco-friendly boards prepared in Examples 1-3 was not detected, which meets the requirements of E. NF ≤0.025mg / m 3 It meets the standard requirements and is in line with green and environmentally friendly requirements.

[0090] Experiment Example 2 Strength Performance Test

[0091] The eco-friendly boards prepared in Examples 1-10 and Comparative Examples 1-3 were tested for transverse static bending strength and surface bonding strength according to the methods in GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels". For the transverse static bending strength test, the length of the board sample was 150 mm and the width was 90 mm. For the surface bonding strength test, Method 1 was used, and the length of the board sample was 50 mm and the width was 50 mm. The test results for transverse static bending strength and surface bonding strength were the average values ​​of three samples.

[0092] The test results are shown in Table 2 below:

[0093] Table 2 Strength performance tests of Examples 1-10 and Comparative Examples 1-3

[0094]

[0095] As can be seen from Table 2, compared with Comparative Examples 1 to 3, the transverse static bending strength and surface bonding strength of Example 1 are significantly improved, indicating that when the adhesive includes polylactic acid and borate, polylactic acid and borate have a synergistic effect, which can improve the overall strength performance of the eco-friendly board.

[0096] Compared with Examples 2 and 4, Examples 5 and 6 show improved transverse static bending strength and surface bonding strength, indicating that when the weight ratio of polylactic acid to borate is 2 to 3:2, the strength performance of eco-friendly boards can be further improved.

[0097] Compared with Example 6, the transverse static bending strength and surface bonding strength of Examples 7-10 are improved, indicating that the modification of silica fume with polyvinyl acetate can further improve the strength performance of eco-friendly boards.

[0098] Compared with Examples 7-8, Examples 9-10 showed improved transverse static bending strength and surface bonding strength, indicating that when the weight ratio of silica fume to polyvinyl acetate is 30:2-3, the strength performance of eco-friendly boards can be further improved.

[0099] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength eco-friendly panel, comprising, from top to bottom, a first decorative paper layer, a first reinforcing layer, a base material layer, a second reinforcing layer, and a second decorative paper layer, characterized in that, The first reinforcing layer and the second reinforcing layer each independently comprise the following components in parts by weight: 70 parts silica sol, 12-20 parts brucite fiber, 15-25 parts silica fume, 3-5 parts zinc stearate, and 5-10 parts binder; The binder includes polylactic acid and borate; The weight ratio of polylactic acid to borate is 2~3:2; The silica fume is polyvinyl acetate modified silica fume, and the raw materials of the polyvinyl acetate modified silica fume include silica fume and polyvinyl acetate. The borates include zinc borate and sodium metaborate, wherein the weight ratio of zinc borate to sodium metaborate is 3:2; The weight ratio of silica fume to polyvinyl acetate is 30:2~3; The preparation method of the polyvinyl acetate modified silica powder includes the following steps: dispersing the polyvinyl acetate and silica powder evenly in ethanol, drying, and obtaining the polyvinyl acetate modified silica powder.

2. The high-strength eco-friendly board according to claim 1, wherein The substrate layer is made of wood, and the wood is wood that has undergone drying treatment; The first decorative paper layer and the second decorative paper layer each independently include one of white wood grain decorative paper and maple wood grain decorative paper.

3. The method according to any one of claims 1-2, wherein the method further comprises the step of: 3.

1. adding 0.1-0.5 wt% of a coupling agent to the mixture of step 2.

1. Includes the following steps: S1. Mix the components of the first reinforcing layer evenly to obtain the first mixed slurry; S2. Mix the components of the second reinforcing layer evenly to obtain the second mixed slurry; S3. The first mixed slurry and the second mixed slurry are respectively coated on the upper surface and the lower surface of the substrate layer and dried to obtain a substrate layer with a first reinforcing layer on the upper surface and a second reinforcing layer on the lower surface. S4. Press a first decorative paper layer onto the upper surface of the first reinforcing layer and press a second decorative paper layer onto the lower surface of the second reinforcing layer to obtain an eco-friendly board material consisting of a first decorative paper layer, a first reinforcing layer, a substrate layer, a second reinforcing layer, and a second decorative paper layer from top to bottom.

4. The method according to claim 3, wherein the method is characterized by, In step S3, the drying process is carried out at a temperature of 90~100℃ for 4~5 hours.

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