Plywood for container bottom plate and preparation process of plywood

Abstract

The invention discloses plywood for a container bottom plate. The invention discloses a preparation process of the plywood for the container soleplate, which comprises the following steps: adding the bamboo powder, tetraethoxysilane and cetyltrimethylammonium bromide into an ethanol solution for ultrasonic dispersion, adding ammonia water, stirring for 10-30 minutes at the stirring temperature of 30-50 DEG C, filtering, washing, drying, calcining for 1-2 hours at the temperature of 400-460 DEG C, crushing, adding the phenolic resin powder, uniformly mixing, and drying to obtain the plywood for the container soleplate. Pressing in a mold to obtain a silicon dioxide enhancement layer; the bamboo curtain layer is soaked in an adhesive, fished out and dried, and a pretreated bamboo curtain layer is obtained; the veneer layer is soaked in an adhesive, fished out and dried, and a pretreated veneer layer is obtained; the pretreated bamboo curtain layers and the pretreated veneer layers are sequentially stacked into five layers, and a silicon dioxide reinforcing layer is additionally arranged between every two adjacent layers; performing program hot pressing to obtain a rough edge plate; and after the rough edge plate is placed, edging, sanding and cutting are conducted, and the plywood for the container bottom plate is obtained.

Description

Technical Field

[0001] This invention relates to the field of bamboo plywood technology, and more particularly to plywood for container flooring and its preparation process. Background Technology

[0002] As we all know, containers are widely used in the transportation industry because of their large capacity and load capacity. Containers need to carry all kinds of goods during use. The container manufacturing industry has high requirements for containers (especially container flooring), which must be both economical and durable, especially in terms of impact resistance and aging resistance.

[0003] Plywood is a commonly used material in furniture making and one of the three major types of engineered wood products. It is used in aircraft, ships, trains, automobiles, construction, and containers. Plywood is a sheet material consisting of three or more layers of thin wood glued together with adhesives. Containers operate in complex and harsh environments with frequent loading, unloading, and transshipment of goods. As the primary load-bearing surface, the container floor requires high mechanical properties, appearance quality, impact resistance, and aging resistance. The structural strength of the plywood used for the container floor is even more critical. The production of container floor materials generally requires a large amount of high-quality timber. With the rapid growth in container demand, resources are dwindling, severely impacting the raw material supply for container floor materials.

[0004] Bamboo is characterized by its high tensile and bending strength, and bamboo-wood composites can significantly increase the strength of container flooring. Typically, a bamboo mat layer can be added to further enhance the overall strength and deformation resistance of the plywood. Currently, some bamboo-wood composite container flooring exists as a replacement for wood flooring. However, due to the large gaps between the bamboo strips, unevenness and other defects can easily occur on the surface of the container flooring. Cracking and other defects are also prone to appear during sanding, which not only severely affects the appearance of the container flooring but also causes instability in its inherent strength. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a plywood for container flooring and its preparation process.

[0006] The manufacturing process of plywood for container flooring includes the following steps:

[0007] S1. Add bamboo powder, tetraethyl orthosilicate, and hexadecyltrimethylammonium bromide to an ethanol solution and ultrasonically disperse for 10-30 min. Add ammonia water and stir for 10-30 min at a stirring temperature of 30-50℃. Filter, wash, dry, calcine at 400-460℃ for 1-2 h, pulverize, add phenolic resin powder and mix evenly. Place in a mold and press for 10-30 min to obtain a silica-reinforced layer.

[0008] S2. Soak the bamboo curtain layer in adhesive, take it out and dry it to obtain a pretreated bamboo curtain layer; soak the thin wood layer in adhesive, take it out and dry it to obtain a pretreated thin wood layer;

[0009] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain the plywood for the container floor.

[0010] Sanding is the process of using sandpaper or sandbags to smooth the material after the edges have been trimmed.

[0011] Preferably, in S1, the mass fraction of ammonia is 20-25%.

[0012] Preferably, in S1, the ethanol solution has a mass fraction of 10-15%.

[0013] Preferably, in S1, the mass ratio of bamboo powder, tetraethyl orthosilicate, hexadecyltrimethylammonium bromide, ammonia, and phenolic resin is 10-15:2-4:0.1-1:10-20:20-50.

[0014] Preferably, in step S2, during the process of immersing the bamboo curtain layer in the adhesive, the immersion temperature is 30-50℃, the immersion pressure is 0.15-0.32MPa, and the pressure holding time is 1-2h.

[0015] Preferably, in S2, during the process of immersing the thin wood layer in the adhesive, the immersion temperature is 30-50℃, the immersion pressure is 0.15-0.32MPa, and the pressure holding time is 1-2h.

[0016] Preferably, in S2, the drying temperature after soaking the bamboo curtain layer and the thin wood layer is 70-80℃.

[0017] Preferably, in S2, the adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid, the mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 5-10:1-2:0.1-1, and the mass fraction of phenolic resin in the system is 11-13.5%.

[0018] Preferably, in S3, the specific operation of the programmed hot pressing is as follows: the temperature is increased to 110-125℃ at a rate of 5-10℃ / min, the pressure is maintained at 1.2-2MPa, and the hot pressing time is 5-20min; the temperature is further increased to 145-155℃, the pressure is maintained at 2.2-2.5MPa, and the hot pressing time is 1-5min; the temperature is decreased to 90-96℃, the pressure is maintained at 3-3.4MPa, and the hot pressing time is 10-30min.

[0019] A type of plywood for container flooring is manufactured using the aforementioned process for preparing plywood for container flooring.

[0020] Beneficial effects:

[0021] This invention uses bamboo powder as a template and, in the presence of hexadecyltrimethylammonium bromide, deposits nano-silica on the bamboo powder. After calcination, the silica can support the formed through-hole structure, making it less prone to breakage. At the same time, when combined with phenolic resin, it has an excellent filling effect on the through-holes. The silica-reinforced layer obtained after molding has good toughness and excellent mechanical properties.

[0022] Adding a silica reinforcement layer between the pretreated bamboo curtain layer and the pretreated thin wood layer not only significantly enhances the bonding strength between the two layers, but also, after hot pressing, the phenolic resin, along with the porous silica, migrates to the depressions in the bamboo and the thin board and penetrates into the cracks in the bamboo, effectively acting as a riveting agent to ensure a firm bond between the layers. Furthermore, the hot pressing process allows the adhesive layer near the bamboo to fully cure, resulting in a better bonding effect. The bamboo is less prone to cracking, significantly improving the load-bearing capacity and service life of the bamboo plywood, while also providing excellent moisture resistance, further extending its lifespan.

[0023] The plywood obtained by this invention has a high pressure resistance, good impact toughness, and is not easily damaged. Moreover, the layered arrangement of bamboo curtain layer, silica reinforcement layer and thin wood layer can significantly enhance the bonding strength between adjacent surfaces, effectively improve the overall strength and tensile and deformation resistance of the plywood, effectively reduce the problem of surface cracking of plywood, and extend its service life.

[0024] This invention utilizes abundant domestic bamboo resources, greatly reducing the demand for raw materials in container floor production due to the global shortage of forest resources. At the same time, it effectively leverages the bending resistance of bamboo, ensuring the quality requirements of container floors and reducing production costs, making it suitable for large-scale promotion and use. Attached Figure Description

[0025] Figure 1 This is a comparison diagram of the static bending strength of the plywood obtained in Example 5 and Comparative Examples 1-2.

[0026] Figure 2 This is a comparison chart of the elastic modulus of the plywood obtained in Example 5 and Comparative Examples 1-2.

[0027] Figure 3 This is a comparison chart of the bonding strength and impact toughness of the plywood obtained in Example 5 and Comparative Examples 1-2.

[0028] Figure 4 This is a comparison chart of the 24-hour water absorption thickness expansion rate of the plywood obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0029] The present invention will be further explained below with reference to specific embodiments.

[0030] Example 1

[0031] The manufacturing process of plywood for container flooring includes the following steps:

[0032] S1. Add 10 kg of bamboo powder, 2 kg of tetraethyl orthosilicate, and 0.1 kg of hexadecyltrimethylammonium bromide to 30 kg of 10% ethanol solution, ultrasonically disperse for 10 min, add 10 kg of 20% ammonia water, stir at 400 r / min for 10 min at 30℃, filter, wash, dry, calcine at 400℃ for 1 h, pulverize, add 20 kg of phenolic resin powder and mix evenly, place in a mold and press for 10 min to obtain a silica-reinforced layer;

[0033] S2. Soak the bamboo curtain layer in adhesive and maintain the pressure at 0.15 MPa for 1 hour, with the soaking temperature at 30℃. Remove the bamboo curtain layer and dry it at 70℃ to obtain the pretreated bamboo curtain layer. Soak the thin wood layer in adhesive and maintain the pressure at 0.15 MPa for 1 hour, with the soaking temperature at 30℃. Remove the thin wood layer and dry it at 70℃ to obtain the pretreated thin wood layer.

[0034] The adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 5:1:0.1, and the mass fraction of phenolic resin in the system is 11%.

[0035] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain a container floor plywood with a width of 1160mm, a length of 2400mm, and a thickness of 28mm.

[0036] The specific operation of the hot pressing program is as follows: heat up to 110℃ at a rate of 5℃ / min, maintain the pressure at 1.2MPa, and hot press for 5min; continue to heat up to 145℃, maintain the pressure at 2.2MPa, and hot press for 1min; cool down to 90℃, maintain the pressure at 3MPa, and hot press for 10min.

[0037] Example 2

[0038] The manufacturing process of plywood for container flooring includes the following steps:

[0039] S1. Add 15kg bamboo powder, 4kg tetraethyl orthosilicate, and 1kg hexadecyltrimethylammonium bromide to 50kg of 15% ethanol solution and ultrasonically disperse for 30min. Add 20kg of 25% ammonia water and stir at 600r / min for 30min at 50℃. Filter, wash, and dry the mixture. Calcine at 460℃ for 2h, pulverize, add 50kg of phenolic resin powder and mix evenly. Place the mixture in a mold and press for 30min to obtain a silica-reinforced layer.

[0040] S2. The bamboo curtain layer is immersed in adhesive and kept under pressure of 0.32 MPa for 2 hours, with the immersion temperature being 50℃. After immersion, it is taken out and dried at 80℃ to obtain the pretreated bamboo curtain layer. The thin wood layer is immersed in adhesive and kept under pressure of 0.32 MPa for 2 hours, with the immersion temperature being 50℃. After immersion, it is taken out and dried at 80℃ to obtain the pretreated thin wood layer.

[0041] The adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 10:2:1, and the mass fraction of phenolic resin in the system is 13.5%.

[0042] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain a container floor plywood with a width of 1160mm, a length of 2400mm, and a thickness of 28mm.

[0043] The specific operation of the hot pressing program is as follows: heat up to 125℃ at a rate of 10℃ / min, maintain the pressure at 2MPa, and hot press for 20min; continue to heat up to 155℃, maintain the pressure at 2.5MPa, and hot press for 5min; cool down to 96℃, maintain the pressure at 3.4MPa, and hot press for 30min.

[0044] Example 3

[0045] The manufacturing process of plywood for container flooring includes the following steps:

[0046] S1. Add 11 kg of bamboo powder, 3.5 kg of tetraethyl orthosilicate, and 0.2 kg of cetyltrimethylammonium bromide to 45 kg of 11% ethanol solution, ultrasonically disperse for 25 min, add 12 kg of 24% ammonia water, stir at 450 r / min for 25 min at 35℃, filter, wash, dry, calcine at 440℃ for 80 min, pulverize, add 40 kg of phenolic resin powder and mix evenly, place in a mold and press for 15 min to obtain a silica-reinforced layer;

[0047] S2. Soak the bamboo curtain layer in adhesive and hold it under pressure of 0.30 MPa for 80 minutes, with the soaking temperature at 45℃. Remove it and dry it at 73℃ to obtain the pretreated bamboo curtain layer. Soak the thin wood layer in adhesive and hold it under pressure of 0.18 MPa for 100 minutes, with the soaking temperature at 35℃. Remove it and dry it at 78℃ to obtain the pretreated thin wood layer.

[0048] The adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 6:1.7:0.2, and the mass fraction of phenolic resin in the system is 13%.

[0049] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain a container floor plywood with a width of 1160mm, a length of 2400mm, and a thickness of 28mm.

[0050] The specific operation of the hot pressing program is as follows: heat up to 115℃ at a rate of 9℃ / min, maintain the pressure at 1.8MPa, and hot press for 8min; continue to heat up to 152℃, maintain the pressure at 2.3MPa, and hot press for 4min; cool down to 92℃, maintain the pressure at 3.3MPa, and hot press for 15min.

[0051] Example 4

[0052] The manufacturing process of plywood for container flooring includes the following steps:

[0053] S1. Add 13kg bamboo powder, 2.5kg tetraethyl orthosilicate, and 0.8kg hexadecyltrimethylammonium bromide to 35kg of 13% ethanol solution, ultrasonically disperse for 15min, add 18kg of 22% ammonia water, stir at 550r / min for 15min at 45℃, filter, wash, dry, calcine at 420℃ for 100min, pulverize, add 30kg phenolic resin powder and mix evenly, place in a mold and press for 25min to obtain a silica-reinforced layer;

[0054] S2. The bamboo curtain layer is immersed in adhesive and held under pressure of 0.18 MPa for 100 minutes, with an immersion temperature of 35℃. After immersion, it is removed and dried at 77℃ to obtain the pretreated bamboo curtain layer. The thin wood layer is immersed in adhesive and held under pressure of 0.30 MPa for 80 minutes, with an immersion temperature of 45℃. After immersion, it is removed and dried at 72℃ to obtain the pretreated thin wood layer.

[0055] The adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 8:1.3:0.8, and the mass fraction of phenolic resin in the system is 11.5%.

[0056] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain a container floor plywood with a width of 1160mm, a length of 2400mm, and a thickness of 28mm.

[0057] The specific operation of the hot pressing program is as follows: heat up to 120℃ at a rate of 7℃ / min, maintain the pressure at 1.4MPa, and hot press for 16min; continue to heat up to 148℃, maintain the pressure at 2.4MPa, and hot press for 2min; cool down to 94℃, maintain the pressure at 3.1MPa, and hot press for 25min.

[0058] Example 5

[0059] The manufacturing process of plywood for container flooring includes the following steps:

[0060] S1. Add 12kg bamboo powder, 3kg tetraethyl orthosilicate, and 0.5kg hexadecyltrimethylammonium bromide to 40kg of 12% ethanol solution, ultrasonically disperse for 20min, add 15kg of 23% ammonia water, stir at 500r / min for 20min at 40℃, filter, wash, dry, calcine at 430℃ for 90min, pulverize, add 35kg phenolic resin powder and mix evenly, place in a mold and press for 20min to obtain a silica-reinforced layer;

[0061] S2. The bamboo curtain layer is immersed in adhesive and held under pressure of 0.24 MPa for 90 minutes, with the immersion temperature at 40℃. After immersion, it is removed and dried at 75℃ to obtain the pretreated bamboo curtain layer. The thin wood layer is immersed in adhesive and held under pressure of 0.24 MPa for 90 minutes, with the immersion temperature at 40℃. After immersion, it is removed and dried at 75℃ to obtain the pretreated thin wood layer.

[0062] The adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 7:1.5:0.5, and the mass fraction of phenolic resin in the system is 12.5%.

[0063] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain a container floor plywood with a width of 1160mm, a length of 2400mm, and a thickness of 28mm.

[0064] The specific operation of the hot pressing program is as follows: heat up to 118℃ at a rate of 8℃ / min, maintain the pressure at 1.6MPa, and hot press for 12min; continue to heat up to 150℃, maintain the pressure at 2.35MPa, and hot press for 3min; cool down to 93℃, maintain the pressure at 3.2MPa, and hot press for 20min.

[0065] Comparative Example 1

[0066] The manufacturing process of plywood for container flooring includes the following steps:

[0067] S1. Add 3 kg of tetraethyl orthosilicate and 0.5 kg of cetyltrimethylammonium bromide to 40 kg of 12% ethanol solution, ultrasonically disperse for 20 min, add 15 kg of 23% ammonia water, stir at 500 r / min for 20 min at 40℃, filter, wash, dry, calcine at 430℃ for 90 min, pulverize, add 35 kg of phenolic resin powder and mix evenly, place in a mold and press for 20 min to obtain a silica-reinforced layer;

[0068] S2. The bamboo curtain layer is immersed in adhesive and held under pressure of 0.24 MPa for 90 minutes, with the immersion temperature at 40℃. After immersion, it is removed and dried at 75℃ to obtain the pretreated bamboo curtain layer. The thin wood layer is immersed in adhesive and held under pressure of 0.24 MPa for 90 minutes, with the immersion temperature at 40℃. After immersion, it is removed and dried at 75℃ to obtain the pretreated thin wood layer.

[0069] The adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 7:1.5:0.5, and the mass fraction of phenolic resin in the system is 12.5%.

[0070] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain a container floor plywood with a width of 1160mm, a length of 2400mm, and a thickness of 28mm.

[0071] The specific operation of the hot pressing program is as follows: heat up to 118℃ at a rate of 8℃ / min, maintain the pressure at 1.6MPa, and hot press for 12min; continue to heat up to 150℃, maintain the pressure at 2.35MPa, and hot press for 3min; cool down to 93℃, maintain the pressure at 3.2MPa, and hot press for 20min.

[0072] Comparative Example 2

[0073] The manufacturing process of plywood for container flooring includes the following steps:

[0074] S1. Add 12kg bamboo powder, 3kg tetraethyl orthosilicate, and 0.5kg cetyltrimethylammonium bromide to 40kg of 12% ethanol solution and ultrasonically disperse for 20min. Add 15kg of 23% ammonia water and stir at 500r / min for 20min at 40℃. Filter, wash, and dry. Add 35kg of phenolic resin powder and mix evenly. Place in a mold and press for 20min to obtain a silica-reinforced layer.

[0075] S2. The bamboo curtain layer is immersed in adhesive and held under pressure of 0.24 MPa for 90 minutes, with the immersion temperature at 40℃. After immersion, it is removed and dried at 75℃ to obtain the pretreated bamboo curtain layer. The thin wood layer is immersed in adhesive and held under pressure of 0.24 MPa for 90 minutes, with the immersion temperature at 40℃. After immersion, it is removed and dried at 75℃ to obtain the pretreated thin wood layer.

[0076] The adhesive is a phenolic resin composite solution, the solutes of which include phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 7:1.5:0.5, and the mass fraction of phenolic resin in the system is 12.5%.

[0077] S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain a container floor plywood with a width of 1160mm, a length of 2400mm, and a thickness of 28mm.

[0078] The specific operation of the hot pressing program is as follows: heat up to 118℃ at a rate of 8℃ / min, maintain the pressure at 1.6MPa, and hot press for 12min; continue to heat up to 150℃, maintain the pressure at 2.35MPa, and hot press for 3min; cool down to 93℃, maintain the pressure at 3.2MPa, and hot press for 20min.

[0079] The static bending strength (longitudinal / transverse) and modulus of elasticity (longitudinal / transverse) of the plywood obtained in Example 5 and Comparative Examples 1-2 were measured with reference to GB / T 19536-2015 "Plywood for Container Floors".

[0080] like Figure 1 and Figure 2 As shown, the static bending strength and modulus of elasticity of the three materials all meet the requirements of GB / T19536-2015 "Plywood for Container Floors" for bamboo-wood composite plywood for container floors; however, the plywood obtained in Example 5 has the highest static bending strength and modulus of elasticity.

[0081] The bonding strength, impact toughness, and 24-hour thickness swelling rate of the plywood obtained in Example 5 and Comparative Examples 1-2 were measured in accordance with GB / T 17657-2013 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels".

[0082] like Figure 3 and Figure 4 As shown, the plywood obtained in Example 5 has the highest bonding strength and impact toughness; while the plywood obtained in Example 5 has the lowest 24-hour water absorption thickness expansion rate, indicating that it has the best moisture-proof performance.

[0083] The applicant believes that this is because the present invention uses bamboo powder as a template and, in the presence of hexadecyltrimethylammonium bromide, deposits nano-silica on the bamboo powder. After calcination, the silica can support the formed through-hole structure, making it less prone to breakage. At the same time, when combined with phenolic resin, it has an excellent filling effect on the through-holes. The silica reinforcement layer obtained after molding has good toughness and excellent mechanical properties. Adding a silica reinforcement layer between the pretreated bamboo curtain layer and the pretreated thin wood layer not only significantly enhances the bonding strength between the two layers, but also, after hot pressing, the phenolic resin, combined with the porous silica, migrates to the depressions in the bamboo and thin board and penetrates into the cracks in the bamboo, effectively acting as a riveting agent to ensure a firm bond between the layers. Further combined with the programmed hot pressing process, the adhesive layer near the bamboo can be fully cured, resulting in a better bonding effect. This significantly enhances the bonding strength between adjacent surfaces, effectively improving the overall strength and tensile and deformation resistance of the plywood, effectively reducing surface cracking, and extending its service life. It also has good moisture resistance, further enhancing its service life.

[0084] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A manufacturing process for plywood used in container flooring, characterized in that, Includes the following steps: S1. Add bamboo powder, tetraethyl orthosilicate, and hexadecyltrimethylammonium bromide to an ethanol solution and ultrasonically disperse for 10-30 min. Add ammonia water and stir for 10-30 min at a stirring temperature of 30-50℃. Filter, wash, dry, calcine at 400-460℃ for 1-2 h, pulverize, add phenolic resin powder and mix evenly. Place in a mold and press for 10-30 min to obtain a silica-reinforced layer. S2. Soak the bamboo curtain layer in adhesive, take it out and dry it to obtain a pretreated bamboo curtain layer; soak the thin wood layer in adhesive, take it out and dry it to obtain a pretreated thin wood layer; S3. The pre-treated bamboo curtain layer and the pre-treated thin wood layer are stacked in sequence to form 5 layers, wherein the bamboo curtain layer veneers are arranged horizontally and the thin wood layer veneers are arranged vertically, and a silicon dioxide reinforcement layer obtained in S1 is added between each adjacent layer; the rough edge board is obtained by hot pressing; after the rough edge board is laid out, the edges are aligned, sanded, and cut to obtain the plywood for the container floor.

2. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S1, the mass fraction of ammonia is 20-25%.

3. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S1, the ethanol solution has a mass fraction of 10-15%.

4. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S1, the mass ratio of bamboo powder, tetraethyl orthosilicate, hexadecyltrimethylammonium bromide, ammonia, and phenolic resin is 10-15:2-4:0.1-1:10-20:20-50.

5. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S2, during the process of immersing the bamboo curtain layer in the adhesive, the immersion temperature is 30-50℃, the immersion pressure is 0.15-0.32MPa, and the pressure holding time is 1-2h.

6. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S2, during the process of immersing the thin wood layer in the adhesive, the immersion temperature is 30-50℃, the immersion pressure is 0.15-0.32MPa, and the holding time is 1-2h.

7. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S2, the drying temperature after soaking the bamboo curtain layer and the thin wood layer is 70-80℃.

8. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S2, the adhesive is a phenolic resin composite solution, and the solutes include: phenolic resin, hexamethylenetetramine and boric acid. The mass ratio of phenolic resin to hexamethylenetetramine and boric acid is 5-10:1-2:0.1-1, and the mass fraction of phenolic resin in the system is 11-13.5%.

9. The manufacturing process of the plywood for container flooring according to claim 1, characterized in that, In S3, the specific operation of the hot pressing program is as follows: heat up to 110-125℃ at a rate of 5-10℃ / min, maintain the pressure at 1.2-2MPa, and hot press for 5-20min; continue to heat up to 145-155℃, maintain the pressure at 2.2-2.5MPa, and hot press for 1-5min; cool down to 90-96℃, maintain the pressure at 3-3.4MPa, and hot press for 10-30min.

10. A type of plywood for container flooring, characterized in that, It is prepared using the manufacturing process of the plywood for container flooring as described in any one of claims 1-9.

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