High-strength ecological environment-friendly plate and preparation method thereof

Abstract

The invention relates to the technical field of plates, and provides a high-strength ecological environment-friendly plate and a preparation method thereof. The ecological environment-friendly board sequentially comprises a first decorative paper layer, a first reinforcing layer, a base material layer, a second reinforcing layer and a second decorative paper layer from top to bottom, and the first reinforcing layer and the second reinforcing layer are each independently prepared from, by weight, 70 parts of silica sol, 12-20 parts of brucite fibers, 15-25 parts of silica fume powder, 3-5 parts of zinc stearate and 5-10 parts of binder; the binder comprises polylactic acid and borate; the weight ratio of polylactic acid to borate is (1: 9)-(9: 1). Through the technical scheme, the problem of poor strength performance of an ecological environment-friendly plate in related technologies is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of boards, and in particular to a high-strength ecological and environmentally friendly board and a preparation method thereof. Background Art

[0002] Eco-friendly boards are a type of man-made boards or natural wood boards with environmentally friendly properties. They are usually 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] Artificial boards are made of wood or non-wood plant fiber materials as the main materials. After a certain mechanical processing process, they are applied with resins and other adhesives that do not contain formaldehyde or free phenol, and then pressed into boards or molded products. Different artificial boards use different materials and additives, and different processes such as press molding, which makes the types and properties of artificial boards also vary greatly. At present, green ecological and environmentally friendly boards have the advantages of ordinary boards, and they do not contain substances that are harmful to the human body and the environment. The overall production standards are higher and the applicability is stronger. They are widely used in construction, furniture, decoration and other fields. Although ecological and environmentally friendly boards have many excellent properties, they also have certain defects in strength. Under heavy pressure, ecological boards are easy to leave marks, and may even deform and crack. This limits the application of ecological and environmentally friendly boards in some environments that need to withstand large loads.

[0004] Therefore, improving the strength performance of ecological and environmentally friendly boards is of great significance for expanding the application range of boards and extending the service life of boards. Summary of the invention

[0005] The present invention provides a high-strength ecological and environmentally friendly board and a preparation method thereof, which solves the problem of poor strength performance of the ecological and environmentally friendly board in the related art.

[0006] The technical solution of the present invention is as follows: The present invention provides a high-strength ecological and environmentally friendly board, which comprises, from top to bottom, a first decorative paper layer, a first reinforcement layer, a substrate layer, a second reinforcement layer and a second decorative paper layer, wherein the first reinforcement layer and the second reinforcement layer each independently comprise the following components in parts by weight: 70 parts of silica sol, 12-20 parts of brucite fiber, 15-25 parts of silica fume, 3-5 parts of zinc stearate, 5-10 parts of binder; The binder includes polylactic acid and borate; The weight ratio of the polylactic acid to the borate is 1:9 to 9:1.

[0007] As a further technical solution, the weight ratio of the polylactic acid to the borate is 2~3:2.

[0008] When the weight ratio of polylactic acid and borate is 2~3:2, the strength performance of the eco-friendly board can be further improved.

[0009] As a further technical solution, the borate includes one or more of zinc borate, sodium borate, and sodium metaborate.

[0010] As a further technical solution, when the borate comprises zinc borate and sodium metaborate, the weight ratio of the zinc borate to the sodium metaborate is 3:2.

[0011] As a further technical solution, the silica fume powder is polyvinyl acetate modified silica fume powder, and the raw materials of the polyvinyl acetate modified silica fume powder include silica fume powder and polyvinyl acetate.

[0012] In the present invention, the silica fume powder is modified by polyvinyl acetate, so that the silica fume powder can be dispersed more evenly in the reinforcement layer, thereby better filling the tiny gaps between the components, making the structure of the reinforcement layer more dense and stable, thereby further improving the strength performance of the ecological and environmentally friendly board.

[0013] As a further technical solution, the weight ratio of the silica fume powder to polyvinyl acetate is 30:2~3.

[0014] When the weight ratio of silica fume powder and polyvinyl acetate is 30:2~3, the strength performance of the ecological and environmentally friendly board can be further improved.

[0015] As a further technical solution, the preparation method of the polyvinyl acetate modified silica fume powder comprises the following steps: uniformly dispersing the polyvinyl acetate and silica fume powder in ethanol, and drying to obtain the polyvinyl acetate modified silica fume powder.

[0016] As a further technical solution, the particle size of the silica fume powder is 1-20 μm.

[0017] As a further technical solution, the material of the substrate layer is wood, and the wood is dried wood.

[0018] As a further technical solution, the moisture content of the wood after the drying process is 6wt%~12wt%.

[0019] 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.

[0020] The present invention also proposes a method for preparing the high-strength ecological and environmentally friendly board, comprising the following steps: S1. Evenly mix the components of the first reinforcement layer to obtain a first mixed slurry; S2, mixing the components of the second reinforcement layer uniformly to obtain a second mixed slurry; S3, applying the first mixed slurry and the second mixed slurry to the upper surface and the lower surface of the substrate layer respectively, and drying to obtain a substrate layer with the first reinforcement layer on the upper surface and the second reinforcement layer on the lower surface; S4. Press a first decorative paper layer on the upper surface of the first reinforcement layer, and press a second decorative paper layer on the lower surface of the second reinforcement layer to obtain an ecological and environmentally friendly board including, from top to bottom, a first decorative paper layer, a first reinforcement layer, a substrate layer, a second reinforcement layer, and a second decorative paper layer.

[0021] As a further technical solution, in step S3, the drying temperature is 90-100° C. and the drying time is 4-5 hours.

[0022] As a further technical solution, the thickness of the first reinforcement layer and the second reinforcement layer are independently 0.8-1.2 mm.

[0023] The working principle and beneficial effects of the present invention are: In the present invention, the eco-friendly board includes a first reinforcement layer, a substrate layer and a second reinforcement layer from top to bottom. The first reinforcement layer and the second reinforcement layer are independently made of silica sol as the main material, combined with brucite fiber, silica fume, zinc stearate and a binder, and a reinforcement layer with a dense and stable internal structure can be prepared. The upper and lower reinforcement layers can reinforce the overall structure of the board and improve its stability. When an external force acts, the stress can be shared, and the middle substrate layer can be well protected and enhanced, so that the overall mechanical properties of the board are better, and deformation and cracking problems are not likely to occur. At the same time, the obtained eco-friendly board has a low formaldehyde emission, which meets the requirements of green environmental protection. Among them, the binder includes polylactic acid and borate. Through the synergistic effect of polylactic acid and borate, the bonding advantage can be fully utilized, and the components can be tightly combined, so that the reinforcement layer is not easy to fall off, and the overall strength performance of the board can also be improved. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the following embodiments and comparative examples, the silica sol is of model ZS-40, and the silicon dioxide content is 40wt%; the pile length of the brucite fiber is 3mm, wherein the calcium oxide content is 16wt% and the magnesium oxide content is 12wt%; the particle size of the silica fume powder is 10μm; the model of the polylactic acid is FY801; the model of the polyvinyl acetate is N100; the material of the substrate layer is dried wood, the moisture content is 8wt% and the thickness is 6mm; the thickness of the first reinforcement layer and the second reinforcement layer is 1mm; the first decorative paper layer and the second decorative paper layer are white wood grain decorative paper with a thickness of 0.12mm.

[0026] Example 1 A high-strength eco-friendly board comprises, from top to bottom, a first decorative paper layer, a first reinforcement layer, a substrate layer, a second reinforcement layer and a second decorative paper layer, wherein the first reinforcement layer and the second reinforcement layer each independently comprise the following components in parts by weight: 70 parts of silica sol, 12 parts of brucite fiber, 15 parts of silica fume, 3 parts of zinc stearate, 5 parts of binder; The binder includes 0.5 parts of polylactic acid and 4.5 parts of borate; The borate is zinc borate and sodium metaborate in a weight ratio of 3:2; The preparation method thereof comprises the following steps: S1. Evenly mix the components of the first reinforcement layer to obtain a first mixed slurry; S2, mixing the components of the second reinforcement layer uniformly to obtain a second mixed slurry; S3, applying the first mixed slurry and the second mixed slurry to the upper surface and the lower surface of the substrate layer respectively, and drying at 90° C. for 5 hours to obtain a substrate layer having the first reinforcement layer on the upper surface and the second reinforcement layer on the lower surface; S4. Press the first decorative paper layer on the upper surface of the first reinforcement layer, and press the second decorative paper layer on the lower surface of the second reinforcement layer to obtain an ecological and environmentally friendly board including, from top to bottom, the first decorative paper layer, the first reinforcement layer, the substrate layer, the second reinforcement layer, and the second decorative paper layer.

[0027] Example 2 A high-strength eco-friendly board comprises, from top to bottom, a first decorative paper layer, a first reinforcement layer, a substrate layer, a second reinforcement layer and a second decorative paper layer, wherein the first reinforcement layer and the second reinforcement layer each independently comprise the following components in parts by weight: 70 parts of silica sol, 16 parts of brucite fiber, 20 parts of silica fume, 4 parts of zinc stearate, and 8 parts of binder; The binder includes 3 parts of polylactic acid and 5 parts of borate; The borate is zinc borate and sodium metaborate in a weight ratio of 3:2; The preparation method thereof comprises the following steps: S1. Evenly mix the components of the first reinforcement layer to obtain a first mixed slurry; S2, mixing the components of the second reinforcement layer uniformly to obtain a second mixed slurry; S3, applying the first mixed slurry and the second mixed slurry to the upper surface and the lower surface of the substrate layer respectively, and drying at 95° C. for 4.5 hours to obtain a substrate layer having the first reinforcement layer on the upper surface and the second reinforcement layer on the lower surface; S4. Press the first decorative paper layer on the upper surface of the first reinforcement layer, and press the second decorative paper layer on the lower surface of the second reinforcement layer to obtain an ecological and environmentally friendly board including, from top to bottom, the first decorative paper layer, the first reinforcement layer, the substrate layer, the second reinforcement layer, and the second decorative paper layer.

[0028] Example 3 A high-strength eco-friendly board comprises, from top to bottom, a first decorative paper layer, a first reinforcement layer, a substrate layer, a second reinforcement layer and a second decorative paper layer, wherein the first reinforcement layer and the second reinforcement layer each independently comprise the following components in parts by weight: 70 parts of silica sol, 20 parts of brucite fiber, 25 parts of silica fume, 5 parts of zinc stearate, and 10 parts of binder; The binder includes 9 parts of polylactic acid and 1 part of borate; The borate is zinc borate and sodium metaborate in a weight ratio of 3:2; The preparation method thereof comprises the following steps: S1. Evenly mix the components of the first reinforcement layer to obtain a first mixed slurry; S2, mixing the components of the second reinforcement layer uniformly to obtain a second mixed slurry; S3, applying the first mixed slurry and the second mixed slurry to the upper surface and the lower surface of the substrate layer respectively, and drying at 100° C. for 4 hours to obtain a substrate layer having the first reinforcement layer on the upper surface and the second reinforcement layer on the lower surface; S4. Press the first decorative paper layer on the upper surface of the first reinforcement layer, and press the second decorative paper layer on the lower surface of the second reinforcement layer to obtain an ecological and environmentally friendly board including, from top to bottom, the first decorative paper layer, the first reinforcement layer, the substrate layer, the second reinforcement layer, and the second decorative paper layer.

[0029] Example 4 The only difference between this embodiment and embodiment 2 is that in this embodiment, the binder includes 6 parts of polylactic acid and 2 parts of borate.

[0030] Example 5 The only difference between this embodiment and embodiment 2 is that in this embodiment, the binder includes 4 parts of polylactic acid and 4 parts of borate.

[0031] Example 6 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.

[0032] Example 7 The only difference between this embodiment and embodiment 6 is that in this embodiment, the silica ash powder is polyvinyl acetate modified silica ash powder, and its preparation method includes the following steps: 1 part of polyvinyl acetate and 30 parts of silica ash powder are evenly dispersed in 35 parts of ethanol, and dried to obtain polyvinyl acetate modified silica ash powder.

[0033] Example 8 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 fume powder.

[0034] Example 9 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 fume powder.

[0035] Example 10 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 fume powder.

[0036] Comparative Example 1 The only difference between this comparative example and Example 1 is that in this comparative example, the binder includes only 5 parts of polylactic acid.

[0037] Comparative Example 2 The only difference between this comparative example and Example 1 is that in this comparative example, the binder only includes 5 parts of borate, and the borate is zinc borate and sodium metaborate in a weight ratio of 3:2.

[0038] Comparative Example 3 The only difference between this comparative example and Example 1 is that no binder is added in this comparative example.

[0039] Experimental Example 1 Formaldehyde emission test The eco-friendly panels prepared in Examples 1 to 3 were tested for formaldehyde emission according to the method in GB / T 39600-2021 "Classification of Formaldehyde Emission of Artificial Panels and Their Products". 3 Climate chamber method, test standard is E NF ≤0.025mg / m 3 The length of the plate sample is 500mm and the width is 500mm. The test result is the average value of 4 samples, and the result is accurate to 0.001mg / m 3 , the test results are shown in Table 1 below: Table 1 Formaldehyde emission test of Examples 1 to 3

[0040] As can be seen from Table 1, the formaldehyde emission of the eco-friendly panels prepared in Examples 1 to 3 was not detected, which met the requirements of E NF ≤0.025mg / m 3 Standard requirements and meet green environmental protection requirements.

[0041] Experimental Example 2 Strength Performance Test The eco-friendly and environmentally friendly boards prepared in Examples 1 to 10 and Comparative Examples 1 to 3 were tested for transverse static bending strength and surface bonding strength according to the method in GB / T 17657-2022 "Test methods for physical and chemical properties of wood-based panels and veneer wood-based panels". When the transverse static bending strength was tested, the length of the board sample was 150 mm and the width was 90 mm; when the surface bonding strength was tested, method 1 was adopted, and the length of the board sample was 50 mm and the width was 50 mm; the test results of the transverse static bending strength and the surface bonding strength were both the average values ​​of the three samples.

[0042] The test results are shown in Table 2 below: Table 2 Strength performance test of Examples 1 to 10 and Comparative Examples 1 to 3

[0043] It can be seen from Table 2 that 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 binder includes polylactic acid and borate, polylactic acid and borate have a synergistic effect and can improve the overall strength performance of the eco-friendly board.

[0044] Compared with Examples 2 and 4, the transverse static bending strength and surface bonding strength of Examples 5 to 6 are improved, indicating that when the weight ratio of polylactic acid to borate is 2 to 3:2, the strength performance of the eco-friendly board can be further improved.

[0045] Compared with Example 6, the transverse static bending strength and surface bonding strength of Examples 7 to 10 are improved, indicating that the strength performance of the eco-friendly board can be further improved by modifying the silica fume powder with polyvinyl acetate.

[0046] Compared with Examples 7 to 8, the transverse static bending strength and surface bonding strength of Examples 9 to 10 are improved, indicating that when the weight ratio of silica fume to polyvinyl acetate is 30:2 to 3, the strength performance of the eco-friendly board can be further improved.

[0047] The above are only 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 in the protection scope of the present invention.

Claims

1. A high-strength ecological and environmentally friendly board, comprising, from top to bottom, a first decorative paper layer, a first reinforcement layer, a substrate layer, a second reinforcement layer and a second decorative paper layer, characterized in that: The first reinforcement layer and the second reinforcement layer each independently include the following components in parts by weight: 70 parts of silica sol, 12-20 parts of brucite fiber, 15-25 parts of silica fume, 3-5 parts of zinc stearate, 5-10 parts of binder; The binder includes polylactic acid and borate; The weight ratio of the polylactic acid to the borate is 1:9 to 9:

1.

2. The high-strength ecological and environmentally friendly board according to claim 1, characterized in that: The weight ratio of the polylactic acid to the borate is 2-3:

2.

3. The high-strength ecological and environmentally friendly board material according to claim 1, characterized in that: The borate includes one or more of zinc borate, sodium borate and sodium metaborate.

4. The high-strength ecological and environmentally friendly board material according to claim 3, characterized in that: When the borate comprises zinc borate and sodium metaborate, the weight ratio of the zinc borate to the sodium metaborate is 3:

2.

5. The high-strength ecological and environmentally friendly board according to claim 1, characterized in that: The silica fume powder is polyvinyl acetate modified silica fume powder, and the raw materials of the polyvinyl acetate modified silica fume powder include silica fume powder and polyvinyl acetate.

6. The high-strength ecological and environmentally friendly board material according to claim 5, characterized in that: The weight ratio of the silica fume powder to polyvinyl acetate is 30:2-3.

7. The high-strength ecological and environmentally friendly board according to claim 5, characterized in that: The preparation method of the polyvinyl acetate modified silica fume powder comprises the following steps: uniformly dispersing the polyvinyl acetate and silica fume powder in ethanol, and drying to obtain the polyvinyl acetate modified silica fume powder.

8. The high-strength ecological and environmentally friendly board according to claim 1, characterized in that: The material of the substrate layer is wood, and the wood is dried wood; 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.

9. A method for preparing a high-strength ecological and environmentally friendly board according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Evenly mix the components of the first reinforcement layer to obtain a first mixed slurry; S2, mixing the components of the second reinforcement layer uniformly to obtain a second mixed slurry; S3, applying the first mixed slurry and the second mixed slurry to the upper surface and the lower surface of the substrate layer respectively, and drying to obtain a substrate layer with the first reinforcement layer on the upper surface and the second reinforcement layer on the lower surface; S4. Press a first decorative paper layer on the upper surface of the first reinforcement layer, and press a second decorative paper layer on the lower surface of the second reinforcement layer to obtain an ecological and environmentally friendly board including, from top to bottom, a first decorative paper layer, a first reinforcement layer, a substrate layer, a second reinforcement layer, and a second decorative paper layer.

10. The method for preparing a high-strength ecological and environmentally friendly board according to claim 9, characterized in that: In step S3, the drying temperature is 90-100° C. and the drying time is 4-5 hours.

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