A mildew-proof, water-resistant and earthquake-resistant container bottom plate and its preparation method

Abstract

The present invention provides a mildew-proof, water-resistant and earthquake-resistant container bottom plate and a preparation method thereof, belonging to the technical field of composite materials. The present invention selects several layers of fibered bamboo bundle veneers that are successively impregnated with a mildew-proof agent and an adhesive and dried, or selects several layers of fibered bamboo bundle veneers with a relatively high sizing amount, which can overcome the deficiencies of waste of agents and increased costs such as machine operation caused by the overall pretreatment method of high-pressure impregnation of mildew-proof agents, and also breaks through the limitation of the post-treatment method of brushing a surface protective layer being affected by the durability of the coating, enhances the mildew-proof and water-resistant performance of the board, and also improves the flexural modulus to a certain extent. Moreover, not only the traditional earthquake-resistant and buffering functional units such as wood veneers, bamboo veneers, and bamboo mats are retained, but also a rubber sheet earthquake-resistant and buffering functional layer is additionally provided. Through a reasonable laminated structure design, the performance advantages of wood, bamboo, and rubber are fully utilized, effectively enhancing the earthquake-resistant performance of the board and improving its application safety.

Description

Technical Field

[0001] The invention relates to the technical field of composite materials, and in particular to a mildew-proof, water-resistant and earthquake-resistant container bottom plate and a preparation method thereof. Background Art

[0002] With the needs of social development, containers are not limited to the use of cargo transportation, but are also widely used in equipment boxes, storage boxes, temporary residences, offices, showrooms, etc. The main materials of the container bottom plate are wood and bamboo, which play a supporting and protective role for people or objects in the container.

[0003] As biomass materials, wood and bamboo are highly sensitive to moisture, and their corresponding products are prone to deformation and cracking in high humidity environments, which in turn affects their performance. Increasing the amount of glue absorbed by the slab within a certain range is conducive to enhancing the internal bonding strength of the hot-pressed formed board and improving its water resistance. In addition, bamboo and bamboo composite materials are also prone to mildew. However, the previous mildew-proof treatment of bamboo composite materials includes an integrated pre-treatment method of high-pressure impregnation with mildew inhibitors and a post-treatment method of applying a surface protective layer. The former causes waste of agents and an increase in costs such as machine operation, while the mildew-proof effect of the latter is limited by the durability of the coating. Furthermore, in actual use, the container floor is inevitably subjected to irregular extrusion and vibration, which can easily cause the container floor to appear dented, delaminated, cracked, etc., thereby reducing the mechanical properties of the container floor and affecting the service life of the container floor. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a mildew-proof, water-resistant and earthquake-resistant container bottom plate and its preparation method and application. The container bottom plate provided by the present invention effectively enhances the mildew-proof, water-resistant and earthquake-resistant performance of the container bottom plate through reasonable material selection and layered structure design.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a mildew-proof, water-resistant and earthquake-resistant container bottom plate, which comprises, from the surface layer to the core layer, a symmetrically arranged mildew-proof and water-resistant functional layer, an interlayer a, an earthquake-resistant buffer functional layer, an interlayer b, an interlayer c and a core layer, wherein the mildew-proof and water-resistant functional layer is a fiberized bamboo bundle single board, the earthquake-resistant buffer functional layer is a rubber sheet, the interlayer a and the interlayer b are single boards, the interlayer c is a bamboo unit layer, and the core layer is a fiberized bamboo bundle single board.

[0007] Preferably, the outermost layer of the mildew-proof, water-resistant and earthquake-resistant container bottom plate further comprises symmetrically arranged impregnated film paper, wherein the impregnated film paper is melamine resin impregnated paper or melamine resin impregnated paper toughened and modified by polyethylene glycol.

[0008] Preferably, the veneer class includes wood veneer or bamboo veneer, and the material of the wood veneer includes poplar, maple, pine or eucalyptus.

[0009] Preferably, the material of the rubber sheet is chloroprene rubber, nitrile rubber or cork rubber.

[0010] Preferably, the bamboo unit layer is a bamboo mat, a bamboo curtain or a bamboo strip mesh sheet.

[0011] Preferably, the bamboo mat is a bamboo strip unit with a weaving angle of 90°.

[0012] Preferably, the bamboo strip mesh sheet is a bamboo strip unit with a weaving angle of 90° or 60° / 120°.

[0013] Preferably, the sizing amount of the mildew-proof and water-resistant functional layer is 15 wt.% to 30 wt.%.

[0014] Preferably, the mildew-proof and water-resistant functional layer further contains a mildew-proof agent, the mildew-proof agent is a waterborne organosilicon quaternary ammonium salt mildew-proof agent or a silica-alumina sol-fixed copper-boron compound mildew-proof agent, the drug loading amount of the mildew-proof and water-resistant functional layer is 10 wt.% to 12 wt.%, and the sizing amount of the mildew-proof and water-resistant functional layer is 10 wt.% to 15 wt.%.

[0015] The present invention also provides a preparation method of the mildew-proof, water-resistant and earthquake-resistant container bottom plate described in the above technical solution, including the following steps:

[0016] After coating adhesives on the mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant buffer functional layer, interlayer b, interlayer c and core layer, perform symmetric blanking according to the combination form of the mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant buffer functional layer, interlayer b, interlayer c and core layer to obtain a board blank;

[0017] Hot-press the board blank to obtain the mildew-proof, water-resistant and earthquake-resistant container bottom plate.

[0018] The present invention provides a mildew-proof, water-resistant and earthquake-resistant container bottom plate, which sequentially includes a symmetrically arranged mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant buffer functional layer, interlayer b, interlayer c and core layer from the surface layer to the core layer. The mildew-proof and water-resistant functional layer is a fibrillated bamboo bundle veneer, the earthquake-resistant buffer functional layer is a rubber sheet, the interlayer a and interlayer b are veneer classes, the interlayer c is a bamboo unit layer, and the core layer is a fibrillated bamboo bundle veneer. The container bottom plate provided by the present invention effectively enhances the mildew-proof, water-resistant and earthquake-resistant performances of the container bottom plate through reasonable material selection and laminated structure design.

[0019] Furthermore, the present invention has the following advantages compared with the prior art:

[0020] (1) The sub-outer layer of the container floor provided by the present invention is set as a mildew-proof and water-resistant functional layer, and several layers of fibrillated bamboo bundle veneers impregnated with a mildew-proof agent and an adhesive in sequence and dried are selected, or several layers of fibrillated bamboo bundle veneers with a relatively high sizing amount are selected (the sizing amount of the mildew-proof and water-resistant functional layer is 15wt.% - 30wt.%). The relatively high sizing amount improves the mildew-proof effect, can overcome the deficiencies of waste of agents and increase in costs such as machine operation caused by the overall pretreatment method of high-pressure impregnation with a mildew-proof agent, and also breaks through the limitation that the post-treatment method of brushing a surface protective layer is affected by the durability of the coating, enhances the mildew-proof and water-resistant performance of the board, and also improves the modulus of rupture to a certain extent;

[0021] (2) The container floor provided by the present invention not only retains the traditional seismic buffer function units such as wood veneer, bamboo veneer, and bamboo mat, but also additionally sets a rubber sheet seismic buffer function layer. Through a reasonable laminated structure design, the performance advantages of wood, bamboo, and rubber are fully utilized, effectively enhancing the seismic performance of the board and improving its application safety;

[0022] (3) The preparation method of the container floor provided by the present invention increases the sizing amount of several board blanks (without causing excessive waste of the sizing solution), enhances the internal bond strength of the hot-pressed formed board and improves its water-resistant performance to a certain extent; different from conventional boards made of hydrophilic fiber materials (wood, bamboo), the present invention additionally adds several layers of non-water-absorbing materials (rubber sheets), which is also beneficial for reducing the overall water absorption thickness swelling or weight gain rate of the container floor;

[0023] (4) According to the usage environment requirements of the container floor, the present invention adjusts the number of each layer unit and related processes and then hot-presses and forms, so that the thickness, function, etc. of the container floor can be customized, and it has a good application prospect. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the mildew-proof, water-resistant and seismic container floor prepared in Examples 1 and 2, where ① is the impregnated film paper, ② is the mildew-proof and water-resistant functional layer, ③ is the sandwich a, ④ is the seismic buffer functional layer, ⑤ is the sandwich b, ⑥ is the sandwich c, and ⑦ is the core layer. Detailed Embodiments

[0025] The present invention provides a mildew-proof, water-resistant and seismic container floor, which sequentially includes a symmetrically arranged mildew-proof and water-resistant functional layer, a sandwich a, a seismic buffer functional layer, a sandwich b, a sandwich c and a core layer from the surface layer to the core layer. The mildew-proof and water-resistant functional layer is a fibrillated bamboo bundle veneer, the seismic buffer functional layer is a rubber sheet, the sandwich a and the sandwich b are veneer types, the sandwich c is a bamboo unit layer, and the core layer is a fibrillated bamboo bundle veneer.

[0026] In the present invention, the outermost layer of the mildew-proof, water-resistant and earthquake-resistant container bottom plate preferably further includes symmetrically arranged impregnated film papers, and the impregnated film papers are preferably melamine resin impregnated papers or melamine resin impregnated papers toughened and modified by polyethylene glycol. In the present invention, the thickness of the impregnated film paper is preferably 0.15 - 0.30 mm, more preferably 0.20 mm, and the impregnation amount is preferably 120 wt.% - 160 wt.%, more preferably 130 wt.% - 150 wt.%, and most preferably 140 wt.%. In the present invention, the impregnated film paper is preferably obtained by impregnating the base paper of the impregnated film paper, and the density of the base paper of the impregnated film paper is preferably 65 - 75 g / m 2 , more preferably 70 g / m 2 . The present invention has no special limitation on the specific method of toughening and modifying the polyethylene glycol-modified melamine resin, and the methods well-known to those skilled in the art can be adopted.

[0027] In the present invention, the number of layers of the mildew-proof, water-resistant and earthquake-resistant container bottom plate is preferably 13 layers. When the number of layers of the specific materials in the mildew-proof and water-resistant functional layer, impregnated film paper, interlayer a, interlayer b, interlayer c and core layer changes, the number of layers of the mildew-proof, water-resistant and earthquake-resistant container bottom plate will also change. Specifically, 11 layers, 15 layers or 22 layers are all acceptable.

[0028] In the present invention, the sizing amount of the mildew-proof and water-resistant functional layer is preferably 15 wt.% - 30 wt.%, more preferably 29 wt.%. A higher sizing amount can improve the mildew-proof effect.

[0029] In the present invention, the mildew-proof and water-resistant functional layer preferably further contains a mildew-proof agent. The mildew-proof agent is preferably a waterborne organosilicon quaternary ammonium salt mildew-proof agent or a silicon-aluminum sol-fixed copper-boron compound mildew-proof agent. The drug loading amount of the mildew-proof and water-resistant functional layer is preferably 10 wt.% - 12 wt.%, and the sizing amount of the mildew-proof and water-resistant functional layer is preferably 10 wt.% - 15 wt.%. The present invention has no special limitation on the source of the mildew-proof agent, and commercially available products well-known to those skilled in the art can be adopted.

[0030] In the present invention, the fibrillated bamboo bundle veneer is preferably prepared by a method including the following steps: Select three- to four-year-old moso bamboo, cut the round bamboo into bamboo tube segments with a length of 1 - 2 m, form bamboo strips by hitting the bamboo to split and removing the bamboo joints, use a steel brush to mechanically scrape off 1 - 3 mm of bamboo green and bamboo yellow, use 4 - 8 groups of symmetric pressing rollers to mechanically roll and form fibrillated bamboo bundles, use a sewing device to perform transverse weaving and integration of the bamboo bundles and then dry to a moisture content of less than 8% to form a fibrillated bamboo bundle veneer for use. More preferably, use a steel brush to mechanically scrape off 2 mm of bamboo green and bamboo yellow, and use 6 groups of symmetric pressing rollers to mechanically roll and form fibrillated bamboo bundles.

[0031] In the present invention, the mildew-proof and water-resistant functional layer containing a mildew-proof agent is preferably prepared by a method including the following steps: impregnating the fibrillated bamboo bundle veneer with a mildew-proof agent and then drying it, and then impregnating it with an adhesive and drying it to a moisture content of less than 8%, for use. In the present invention, the agent concentration of the mildew-proof agent is 1.5 wt.% to 3.0 wt.%. In the present invention, both the impregnation of the mildew-proof agent and the impregnation of the adhesive are preferably pressure impregnation. The pressure impregnation time is preferably 30 to 90 min, and the impregnation pressure is preferably 0.05 to 0.15 MPa.

[0032] In the present invention, the lay-up texture of the fibrillated bamboo bundle veneer in the mildew-proof and water-resistant functional layer is preferably consistent, and the number of layers of the fibrillated bamboo bundle veneer in the mildew-proof and water-resistant functional layer is preferably 2 to 4 layers.

[0033] In the present invention, the adhesive is preferably phenolic resin or modified phenolic resin. The present invention preferably realizes the preparation of the mildew-proof and water-resistant functional layer with an impregnation amount of 15 wt.% to 30 wt.% by impregnating a resin with a high solid content, extending the impregnation time, or by the method of dipping - drying - dipping again - drying again. The present invention has no special limitation on the source of the modified phenolic resin, and any type well-known to those skilled in the art can be used.

[0034] In the present invention, the core layer is a fibrillated bamboo bundle veneer. The present invention has no special limitation on the preparation method of the fibrillated bamboo bundle veneer, and it can be prepared by using the technical solution described in the above technical solution.

[0035] In the present invention, the sizing amount of the core layer is preferably 10 wt.% to 20 wt.%, more preferably 12 wt.% to 15 wt.%. The adhesive used for the core layer is preferably phenolic resin or modified phenolic resin. The present invention has no special limitation on the source of the modified phenolic resin, and any type well-known to those skilled in the art can be used.

[0036] In the present invention, the lay-up texture of the fibrillated bamboo bundle veneer in the core layer is preferably consistent with the texture of the mildew-proof and water-resistant functional layer, and the number of layers of the fibrillated bamboo bundle veneer in the core layer is preferably 2 to 4 layers.

[0037] In the present invention, the material of the rubber sheet is preferably chloroprene rubber, nitrile rubber or cork rubber.

[0038] In the present invention, the thickness of the rubber sheet is preferably 1 to 4 mm, more preferably 1 to 2 mm.

[0039] In the present invention, the number of layers of the rubber sheet is preferably 1 layer.

[0040] In the present invention, the sizing amount of the rubber sheet is preferably 80 - 100 g / m on one side 2 , more preferably 90 - 100 g / m on one side2 In the present invention, the adhesive used for the rubber sheet is preferably polyisocyanate.

[0041] In the present invention, the amount of adhesive applied to the sandwich layer a and the sandwich layer b is independently preferably 100-140 g / m on one side 2 , more preferably 120-130 g / m on one side 2 , most preferably 125 g / m on one side 2 In the present invention, the adhesives used for the sandwich layer a and the sandwich layer b are preferably phenolic resin or modified phenolic resin. The present invention has no special limitation on the source of the modified phenolic resin, and the types well-known to those skilled in the art can be adopted.

[0042] In the present invention, the veneer type preferably includes wood veneer or bamboo veneer, and the material of the wood veneer preferably includes poplar, maple, pine or eucalyptus.

[0043] The present invention preferably selects poplar, maple, pine or eucalyptus, and the wood veneer is obtained by rotary cutting. The thickness of the wood veneer is preferably 1.0-1.5 mm.

[0044] In the present invention, the thickness of the bamboo veneer is preferably 0.10-1.0 mm or 2-5 mm. The present invention preferably obtains a bamboo veneer with a thickness of 0.10-1.0 mm by rotary cutting round bamboo or obtains a bamboo veneer with a thickness of 2-5 mm by planing and cutting a flat bamboo board. The thickness of the bamboo veneer is preferably 0.10-0.6 mm.

[0045] In the present invention, the bamboo unit layer is preferably a bamboo mat, a bamboo curtain or a bamboo strip mesh sheet.

[0046] In the present invention, the bamboo mat is preferably a bamboo strip unit with a weaving angle of 90°.

[0047] In the present invention, the bamboo strip mesh sheet is preferably a bamboo strip unit with a weaving angle of 90° or 60° / 120°.

[0048] The present invention preferably selects moso bamboo that is three to four years old, cuts the round bamboo into bamboo tube segments with a length of 1.2-2.4 m, uses a bamboo splitting machine to obtain radial or tangential bamboo strips with a width of 10-30 mm, more preferably 20-25 mm, weaves the bamboo strips at 90° in longitude and latitude to obtain the bamboo mat, or weaves the bamboo strips horizontally to obtain the bamboo curtain, or weaves the bamboo strips through 90° or 60° / 120° to obtain the bamboo strip mesh sheet.

[0049] In the present invention, the lay-up texture of the veneer in the sandwich layer a and the sandwich layer b is preferably perpendicular to the texture of the mold-proof and water-resistant functional layer, and the number of layers of the sandwich layer a and the sandwich layer b is independently preferably 1-2 layers.

[0050] In the present invention, the interlayer c preferably comprises a lay-up structure of 90° or 60° / 120°. The interlayer c functions as a load-bearing layer, and the lay-up structure of 90° or 60° / 120° has better pressure-bearing capacity than the lay-up with grains in the same direction.

[0051] In the present invention, the number of bamboo unit layers in the interlayer c is preferably 2 to 4 layers.

[0052] The present invention also provides a method for preparing the mildew-proof, water-resistant and earthquake-resistant container bottom plate described in the above technical solution, comprising the following steps:

[0053] After coating adhesives on the mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant buffer functional layer, interlayer b, interlayer c and core layer, perform symmetric lay-up according to the combination form of the mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant buffer functional layer, interlayer b, interlayer c and core layer to obtain a board blank;

[0054] Hot press the board blank to obtain the mildew-proof, water-resistant and earthquake-resistant container bottom plate.

[0055] The present invention has no special limitation on the specific manner of coating adhesives on the mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant buffer functional layer, interlayer b, interlayer c and core layer. Any methods well-known to those skilled in the art, such as impregnation and brushing, can be used as long as the amount of glue applied meets the requirements of the above technical solution.

[0056] In the present invention, the adhesive preferably used between the interlayer a or interlayer b and the earthquake-resistant buffer functional layer is polyisocyanate, and it cannot be phenolic resin or modified phenolic resin because the bonding effect of phenolic resin and modified phenolic resin is very poor and even cannot bond.

[0057] When the mildew-proof, water-resistant and earthquake-resistant container bottom plate further comprises impregnated film paper, the present invention has no special limitation on the coating method of the impregnated film paper, and it can be formed by methods well-known to those skilled in the art.

[0058] In the present invention, the temperature of the hot pressing is preferably 140 - 155 °C, more preferably 145 - 150 °C. The hot pressing pressure is not less than 4 MPa, more preferably 5 - 8 MPa, and most preferably 6 MPa. The hot pressing time is preferably 1.5 mm / min. The target thickness of the board is preferably 10 - 28 mm, more preferably 20 - 22 mm, and the target density is preferably 0.95 - 1.10 g / cm 3 and more preferably 1.02 - 1.05 g / cm 3 . In the present invention, the hot pressing preferably places the board blank in a hot press and performs hot pressing in the hot press in the way of "hot in and cold out".

[0059] After the hot pressing is completed, it is preferred in the present invention that the temperatures of the upper and lower hot pressing plates drop below 60°C, and the board is taken out to obtain the mildew-proof, water-resistant and earthquake-resistant container bottom board, more preferably dropping to 45 - 50°C.

[0060] To further illustrate the present invention, the following examples are used to describe in detail the mildew-proof, water-resistant and earthquake-resistant container bottom board provided by the present invention and its preparation method, but they should not be construed as limiting the protection scope of the present invention.

[0061] Example 1

[0062] Figure 1 FIG. is a schematic structural diagram of the mildew-proof, water-resistant and earthquake-resistant container bottom board prepared in this example, where ① is the impregnated film paper, ② is the mildew-proof and water-resistant functional layer, ③ is the sandwich layer a, ④ is the earthquake-resistant buffer functional layer, ⑤ is the sandwich layer b, ⑥ is the sandwich layer c, and ⑦ is the core layer.

[0063] The mildew-proof, water-resistant and earthquake-resistant container bottom board of this example sequentially includes from the surface layer to the core layer: ① impregnated film paper, ② mildew-proof and water-resistant functional layer, ③ sandwich layer a, ④ earthquake-resistant buffer functional layer, ⑤ sandwich layer b, ⑥ sandwich layer c, ⑦ core layer. The ① impregnated film paper is a melamine resin impregnated paper modified with tris(2-hydroxyethyl) isocyanurate; the ② mildew-proof and water-resistant functional layer is a fiberized bamboo bundle veneer; the ③ sandwich layer a is a poplar veneer; the ④ earthquake-resistant buffer functional layer is a chloroprene rubber sheet; the ⑤ sandwich layer b is a poplar veneer; the ⑥ sandwich layer c is a bamboo mat; the ⑦ core layer is a fiberized bamboo bundle veneer.

[0064] This example also provides a preparation method for the above-mentioned mildew-proof, water-resistant and earthquake-resistant container bottom board:

[0065] S1. Preparation of ① impregnated film paper:

[0066] S11. Use 70 g / m 2 impregnated film paper base paper, control the impregnation amount at 140 wt.%, and prepare a melamine resin impregnated paper modified with tris(2-hydroxyethyl) isocyanurate, with a thickness of 0.30 mm.

[0067] S2. Preparation of ② mildew-proof and water-resistant functional layer:

[0068] S21. Select four-year-old moso bamboo, cut the round bamboo into bamboo tube sections with a length of 2 m, form bamboo strips by hitting the bamboo to split and removing the bamboo joints, use a steel brush to mechanically scrape off 3 mm of bamboo green and bamboo yellow, use 6 groups of symmetric pressure rollers to mechanically roll and form fiberized bamboo bundles, use a sewing device to perform transverse weaving and integration of the bamboo bundles to form a fiberized bamboo bundle veneer, and dry it to a moisture content of less than 8% for later use.

[0069] S22. Impregnate the fibrillated bamboo bundle veneer with a mildew-proof agent and then dry it. Next, impregnate it with an adhesive and dry it to a moisture content of less than 8% for later use. Using the pressure impregnation process, select a waterborne organosilicon quaternary ammonium salt mildew-proof agent with a chemical agent concentration of 3.0%, a pressure application time of 30 min, and an impregnation pressure of 0.05 MPa; the adhesive is a modified phenolic resin. By adjusting the process parameters, control the drug loading after drying to 12 wt.% and the glue uptake of the bamboo bundle to 10 wt.%.

[0070] S3. ③ Preparation of interlayer a:

[0071] S31. Take poplar wood logs, cut veneers by rotary cutting with a thickness of 1.2 mm, apply phenolic resin as the adhesive, and the glue application amount is 125 g / m on one side 2 .

[0072] S4. ④ Preparation of the seismic buffer function layer:

[0073] S41. Select a chloroprene rubber sheet with a thickness of 2.0 mm, apply polyisocyanate as the adhesive type, and the glue application amount is 90 g / m on one side 2 .

[0074] S5. ⑤ Preparation of interlayer b:

[0075] S51. Take poplar wood logs, cut veneers by rotary cutting with a thickness of 1.2 mm, apply phenolic resin as the adhesive, and the glue application amount is 125 g / m on one side 2 .

[0076] S52. The adhesive used between ③ interlayer a (or ⑤ interlayer b) and ④ the seismic buffer function layer is polyisocyanate and cannot be phenolic resin.

[0077] S6. ⑥ Preparation of interlayer c:

[0078] S61. Select four-year-old moso bamboo, cut the round bamboo into bamboo tube segments with a length of 2.4 m, and use a bamboo splitting machine to obtain radial bamboo strips with a width of 20 mm.

[0079] S62. Weave the bamboo strips at 90° in the warp and weft directions to obtain a bamboo mat.

[0080] S7. ⑦ Preparation of the core layer:

[0081] S71. Take the fibrillated bamboo bundle veneer prepared in S21, impregnate it with an adhesive and dry it to a moisture content of less than 8% for later use. Among them, the adhesive is phenolic resin and the sizing amount is 15 wt.%.

[0082] S8. Panel assembly:

[0083] S81. Perform symmetric assembly in the combination form of ①②③④⑤⑥⑦⑥⑤④③②①.

[0084] S82. ② In the mildew-proof and water-resistant functional layer, the assembled texture of the bamboo bundle veneers is consistent, and the number of layers is 3; ③ In the sandwich layer a (and the sandwich layer b), the assembled texture of the veneers is perpendicular to that of the ② mildew-proof and water-resistant functional layer, and the number of layers is 2; ④ The number of layers of the seismic buffer function layer is 1; ⑥ In the sandwich layer c, the number of bamboo units is 3; ⑦ In the core layer, the assembled texture of the bamboo bundle veneers is consistent with that of the ② mildew-proof and water-resistant functional layer, and the number of layers is 2.

[0085] S9. Preparation of the mildew-proof, water-resistant and seismic container bottom plate:

[0086] Place the board blank in a hot press and hot press it in the hot press in the way of "hot in and cold out". The hot press temperature is 145 °C, the hot press pressure is 8 MPa, the hot press time is 1.5 mm / min, the target thickness of the board is 28 mm, and the target density is 1.05 g / cm 3 . When the temperatures of the upper and lower hot press plates drop to 50 °C, take out the board.

[0087] Example 2

[0088] The structure of the mildew-proof, water-resistant and seismic container bottom plate in this example is as Figure 1 shown. From the surface layer to the core layer, it successively includes ① impregnated film paper, ② mildew-proof and water-resistant functional layer, ③ sandwich layer a, ④ seismic buffer function layer, ⑤ sandwich layer b, ⑥ sandwich layer c, ⑦ core layer. The ① impregnated film paper is a three (2-hydroxyethyl) isocyanurate modified melamine resin impregnated paper; the ② mildew-proof and water-resistant functional layer is a fibrillated bamboo bundle veneer; the ③ sandwich layer a is a maple veneer; the ④ seismic buffer function layer is a nitrile rubber sheet; the ⑤ sandwich layer b is a poplar veneer; the ⑥ sandwich layer c is a bamboo curtain; the ⑦ core layer is a fibrillated bamboo bundle veneer.

[0089] This example also provides a preparation method for the above-mentioned mildew-proof, water-resistant and seismic container bottom plate, and this method is:

[0090] S1. ① Preparation of impregnated film paper:

[0091] S11. Use 70 g / m 2 of impregnated film paper base paper, control the impregnation amount at 130 wt.%, and prepare a three (2-hydroxyethyl) isocyanurate modified melamine resin impregnated paper with a thickness of 0.20 mm.

[0092] S2. ② Preparation of the mildew-proof and water-resistant functional layer:

[0093] S21. Select four-year-old moso bamboo, cut the round bamboo into bamboo tube segments with a length of 2 m, form bamboo strips by hitting the bamboo and removing the bamboo joints, use a steel brush to mechanically scrape off 3 mm of bamboo green and bamboo yellow, use 6 groups of symmetric pressure rollers to mechanically roll and form fibrillated bamboo bundles, use a sewing device to conduct horizontal weaving and integration of the bamboo bundles to form fibrillated bamboo bundle veneers, and dry them to a moisture content of less than 8% for standby.

[0094] S22. Impregnate the fibrillated bamboo bundle veneer with the adhesive and then dry it to a moisture content of less than 8% for later use. Among them, the adhesive is modified phenolic resin, and the sizing amount is 29 wt.%.

[0095] S23. This sizing amount is achieved by the method of dipping - drying - redipping - redrying.

[0096] S3. Preparation of the sandwich layer a:

[0097] S31. Take maple wood logs, cut veneers by rotary cutting, with a thickness of 1.0 mm. Brush the adhesive, which is modified phenolic resin, and the sizing amount is 120 g / m² on one side. 2 .

[0098] S4. Preparation of the seismic buffer function layer:

[0099] S41. Select nitrile rubber sheets with a thickness of 1.0 mm. Brush the type of adhesive, which is polyisocyanate, and the sizing amount is 100 g / m² on one side. 2 .

[0100] S5. Preparation of the sandwich layer b:

[0101] S51. Take poplar wood logs, cut veneers by rotary cutting, with a thickness of 1.2 mm. Brush the adhesive, which is modified phenolic resin, and the sizing amount is 130 g / m² on one side. 2 .

[0102] S52. The adhesive used between the sandwich layer a (or the sandwich layer b) and the seismic buffer function layer is polyisocyanate and cannot be modified phenolic resin.

[0103] S6. Preparation of the sandwich layer c:

[0104] S61. Select four - year - old moso bamboo, cut the round bamboo into bamboo tube segments with a length of 2.4 m, and use a bamboo splitting machine to obtain radial bamboo strips with a width of 25 mm.

[0105] S62. Weave the bamboo strips horizontally to obtain a bamboo curtain.

[0106] S7. Preparation of the core layer:

[0107] S71. Take the fibrillated bamboo bundle veneer prepared in S21, impregnate it with the adhesive and then dry it to a moisture content of less than 8% for later use. Among them, the adhesive is phenolic resin, and the sizing amount is 12 wt.%.

[0108] S8. Laminating of the board:

[0109] S81. Conduct symmetric lamination according to the combination form of ①②③④⑤⑥⑦⑥⑤④③②①.

[0110] S82. ② In the mildew-proof and water-resistant functional layer, the laminating texture of the bamboo bundle veneers is consistent, and the number of layers is 2; ③ In the sandwich layer a (and the sandwich layer b), the laminating texture of the veneers is perpendicular to the texture of the ② mildew-proof and water-resistant functional layer, and the number of layers is 1; ④ The number of layers of the earthquake-resistant buffer function layer is 1; ⑥ In the sandwich layer c, the number of bamboo units is 4, and the laminating form is 90° to each other; ⑦ In the core layer, the laminating texture of the bamboo bundle veneers is consistent with the texture of the ② mildew-proof and water-resistant functional layer, and the number of layers is 2.

[0111] S9. Preparation of the mildew-proof, water-resistant and earthquake-resistant container bottom plate:

[0112] Place the board blank in a hot press, and use the method of "hot in and cold out" to hot-press and form in the hot press. The hot-pressing temperature is 150 °C, the hot-pressing pressure is 5 MPa, the hot-pressing time is 1.5 mm / min, the target thickness of the board is 20 mm, and the target density is 1.02 g / cm 3 . When the temperatures of the upper and lower hot press plates drop to 50 °C, take out the board.

[0113] Example 3

[0114] The mildew-proof, water-resistant and earthquake-resistant container bottom plate of this example includes, from the surface layer to the core layer, ① impregnated film paper, ② mildew-proof and water-resistant functional layer, ③ sandwich layer a, ④ earthquake-resistant buffer function layer, ⑤ sandwich layer b, ⑥ sandwich layer c, and ⑦ core layer in sequence. The ① impregnated film paper is melamine resin impregnated paper; the ② mildew-proof and water-resistant functional layer is fibered bamboo bundle veneer; the ③ sandwich layer a is sliced bamboo veneer; the ④ earthquake-resistant buffer function layer is cork rubber sheet; the ⑤ sandwich layer b is rotary-cut bamboo veneer; the ⑥ sandwich layer c is bamboo strip mesh sheet; the ⑦ core layer is fibered bamboo bundle veneer.

[0115] This example also provides a method for preparing the above-mentioned mildew-proof, water-resistant and earthquake-resistant container bottom plate, and this method is:

[0116] S1. ① Preparation of impregnated film paper:

[0117] S11. Use 70 g / m 2 impregnated film paper base paper, control the impregnation amount to 150 wt.%, and prepare melamine resin impregnated paper with a thickness of 0.30 mm.

[0118] S2. ② Preparation of the mildew-proof and water-resistant functional layer:

[0119] S21. Select three-year-old moso bamboo, cut the round bamboo into bamboo tube segments with a length of 2 m, form bamboo strips by hitting the bamboo to split and removing the bamboo joints, use a steel brush to mechanically scrape off 2 mm of bamboo green and bamboo yellow, use 6 groups of symmetric pressure rollers to mechanically roll and form fibered bamboo bundles, use a sewing device to perform horizontal weaving and integration of the bamboo bundles to form fibered bamboo bundle veneers, and dry them to a moisture content of less than 8% for standby.

[0120] S22. Impregnate the fibrillated bamboo bundle veneer with a mildew-proof agent and then dry it. Then impregnate it with an adhesive and dry it to a moisture content of less than 8% for later use. Using the pressure impregnation process, select a silica-alumina sol-fixed copper-boron compound mildew-proof agent with a chemical agent concentration of 3.0%, a pressure application time of 30 min, and an impregnation pressure of 0.05 MPa; the adhesive is phenolic resin. By adjusting the process parameters, control the drug loading after drying to 12 wt.% and the glue impregnation amount of the bamboo bundle to 10 wt.%.

[0121] S3. ③ Preparation of sandwich layer a:

[0122] S31. Obtain bamboo veneer by planing and cutting a bamboo flat plate, with a thickness of 2 mm. Brush the phenolic resin adhesive, and the glue application amount is 130 g / m on one side. 2 。

[0123] S4. ④ Preparation of the seismic buffer function layer:

[0124] S41. Select a cork rubber sheet with a thickness of 2.0 mm. Brush the adhesive of polyisocyanate, and the glue application amount is 90 g / m on one side. 2 。

[0125] S5. ⑤ Preparation of sandwich layer b:

[0126] S51. Obtain bamboo veneer by rotary cutting a round bamboo, with a thickness of 0.5 mm. Brush the phenolic resin adhesive, and the glue application amount is 140 g / m on one side. 2 。

[0127] S53. The adhesive used between ③ sandwich layer a (or ⑤ sandwich layer b) and ④ the seismic buffer function layer is polyisocyanate and cannot be phenolic resin.

[0128] S6. ⑥ Preparation of sandwich layer c:

[0129] S61. Select three-year-old moso bamboo, cut the round bamboo into bamboo tube segments with a length of 2.4 m, and use a bamboo splitting machine to obtain radial bamboo strips with a width of 20 mm.

[0130] S62. Weave the bamboo strips through 60° / 120° to obtain a bamboo strip mesh sheet.

[0131] S7. ⑦ Preparation of the core layer:

[0132] Take the fibrillated bamboo bundle veneer prepared in S21, impregnate it with an adhesive and dry it to a moisture content of less than 8% for later use. Among them, the adhesive is phenolic resin and the sizing amount is 12 wt.%.

[0133] S8. Panel assembly:

[0134] S81. Perform symmetric assembly according to the combination form of ①②③④⑤⑥⑦⑥⑤④③②①.

[0135] S82. ② In the mildew-proof and water-resistant functional layer, the lamination texture of the bamboo veneers is consistent, and the number of layers is 2; ③ In the sandwich layer a (and the sandwich layer b), the lamination texture of the veneers is perpendicular to that of the ② mildew-proof and water-resistant functional layer, and the number of layers is 1; ④ The number of layers of the earthquake-resistant buffer function is 1; ⑥ In the sandwich layer c, the number of bamboo units is 4, and the lamination form is 60° / 120° to each other; ⑦ In the core layer, the lamination texture of the bamboo veneers is consistent with that of the ② mildew-proof and water-resistant functional layer, and the number of layers is 2.

[0136] S9. Preparation of the mildew-proof, water-resistant and earthquake-resistant container bottom plate:

[0137] Place the board blank in a hot press and hot press it into shape in the hot press in the way of "hot in and cold out". The hot press temperature is 145 °C, the hot press pressure is 6 MPa, the hot press time is 1.5 mm / min, the target thickness of the board is 22 mm, and the target density is 1.05 g / cm 3 . When the temperatures of the upper and lower hot press plates drop to 45 °C, take out the board.

[0138] According to the requirements of standards such as GB / T 19536-2015 "Plywood for Container Bottom Plates", GB / T 18102-2007 "Decorative Laminated Wood Flooring", GB / T 20241-2006 "Laminated Veneer Lumber", T / CSF 009-2019 "Bamboo-Wood Composite Container Bottom Plates", and based on the test methods in standards such as GB / T 17657-2013 "Test Methods for Physical and Chemical Properties of Wood-Based Panels and Decorative Wood-Based Panels", GB / T 15102-2006 "Decorative Laminated Wood-Based Panels with Impregnated Film Paper", GB / T 18261-2000 "Test Methods for Preventing Wood Molds and Blue-Staining Fungi with Mildew Inhibitors", JC / T 2039-2010 "Antibacterial and Mildew-Proof Wood Decorative Panels", etc., test the properties of the mildew-proof, water-resistant and earthquake-resistant container bottom plates in Examples 1 to 3, and the results are listed in Table 1.

[0139] Table 1 Properties of the mildew-proof, water-resistant and earthquake-resistant container bottom plates in Examples 1 to 3

[0140] Test Item Standard Value Value in Test Standard Example 1 Example 2 Example 3 Water Content / % ≤12.0 5.0～8.0 ≤7.1 ≤6.8 ≤6.5 <![CDATA[Density / g·cm -3 > ≥0.75 0.95～1.10 1.05 1.02 1.05 Modulus of Rupture (Longitudinal) / MPa ≥75.0 80～90 ≥95 ≥95 ≥95 Elastic Modulus (Longitudinal) / GPa ≥8.0 8.5～9.0 ≥10 ≥10 ≥10 Concentrated Load (Middle) / kN ≥48.0 50.0～60.0 ≥70.0 ≥55.0 ≥54.0 Thickness Swelling Rate after Water Absorption / % ≤18.0 6.0～9.0 ≤5.0 ≤5.0 ≤5.0 Mildew Resistance Grade - 1 0 0 0 Dynamic Load / Fatigue Strength / 10,000 times - 10 ≥15 ≥15 ≥15

[0141] From the data in Table 1, it can be seen that the performance of each item of the container bottom plate provided by the present invention meets the standard requirements and is better than the parameter values reported in the test standards. From the data of the mildew-proof grade, it can be seen that the container bottom plate provided by the present invention has excellent mildew-proof performance; from the data of the water absorption thickness swelling rate, it can be seen that the container bottom plate provided by the present invention has good water resistance and deformation prevention ability; from the elastic modulus (longitudinal) and dynamic load / fatigue strength (the surface bears 1600 N / m 2From the data of the force (frequency: 1 Hz), it can be seen that the container floor provided by the present invention has excellent elasticity, can well resist external forces, and can withstand reciprocating loads at the same time. In summary, the preparation method of the container floor provided by the present invention can broaden its application fields and extend its service life.

[0142] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A mildew-proof, water-resistant and earthquake-resistant container bottom plate, characterized in that, From the surface layer to the core layer, it sequentially includes symmetrically arranged mildew-proof and water-resistant functional layers, interlayer a, earthquake-resistant and buffer functional layers, interlayer b, interlayer c, and the core layer. The mildew-proof and water-resistant functional layer is a fibrotic bamboo bundle veneer, the earthquake-resistant and buffer functional layer is a rubber sheet, interlayer a and interlayer b are veneer types, interlayer c is a bamboo unit layer, and the core layer is a fibrotic bamboo bundle veneer; The laminating texture of the fibrotic bamboo bundle veneer in the mildew-proof and water-resistant functional layer is consistent; the number of layers of the fibrotic bamboo bundle veneer in the mildew-proof and water-resistant functional layer is 2 to 4 layers; the laminating texture of the fibrotic bamboo bundle veneer in the core layer is consistent with the texture of the mildew-proof and water-resistant functional layer; the number of layers of the fibrotic bamboo bundle veneer in the core layer is 2 to 4 layers; the laminating texture of the veneer in interlayer a and interlayer b is perpendicular to the texture of the mildew-proof and water-resistant functional layer; interlayer c contains a laminating structure of 90° or 60° / 120°; the number of layers of interlayer a and interlayer b is independently 1 to 2 layers; the number of layers of the bamboo unit layer in interlayer c is 2 to 4 layers; The sizing amount of the mildew-proof and water-resistant functional layer is 15wt.% to 30wt.%; the sizing amount of the core layer is 10wt.% to 20wt.%; The material of the rubber sheet is chloroprene rubber or nitrile rubber. The thickness of the rubber sheet is 1 to 4 mm, the number of layers of the rubber sheet is 1 layer, and the coating amount of the rubber sheet is 80 to 100 g / m on one side 2 ; The glue application amounts of the interlayers a and b are independently 100 to 120 g / m on a single side 2 ; The adhesive used for the rubber sheet is polyisocyanate; the adhesive used for the core layer is phenolic resin or modified phenolic resin; the adhesive used for interlayer a and interlayer b is phenolic resin or modified phenolic resin; the adhesive used for the mildew-proof and water-resistant functional layer is phenolic resin or modified phenolic resin; the adhesive used between interlayer a or interlayer b and the earthquake-resistant and buffer functional layer is polyisocyanate.

2. The mildew-proof, water-resistant and earthquake-resistant container bottom plate according to claim 1, wherein, The outermost layer of the mildew-proof, water-resistant and earthquake-resistant container bottom plate also includes symmetrically arranged impregnated film paper, and the impregnated film paper is melamine resin impregnated paper or melamine resin impregnated paper toughened and modified by polyethylene glycol.

3. The mildew-proof, water-resistant and earthquake-resistant container bottom plate according to claim 1, characterized in that The veneer type includes wood veneer or bamboo veneer, and the material of the wood veneer includes poplar, maple, pine or eucalyptus.

4. The anti-mildew, water-resistant and earthquake-resistant container floor according to claim 1, wherein The bamboo unit layer is a bamboo mat or a bamboo strip mesh sheet; the bamboo mat is a bamboo strip unit with a weaving angle of 90°; the bamboo strip mesh sheet is a bamboo strip unit with a weaving angle of 90° or 60° / 120°.

5. The preparation method of the anti-mildew, water-resistant and earthquake-resistant container bottom plate according to any one of claims 1 to 4, characterized in that, It includes the following steps: After coating adhesives on the mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant and buffer functional layer, interlayer b, interlayer c, and the core layer, perform symmetric laminating in the combination form of the mildew-proof and water-resistant functional layer, interlayer a, earthquake-resistant and buffer functional layer, interlayer b, interlayer c, and the core layer to obtain a board blank; Hot-press the board blank to obtain the mildew-proof, water-resistant and earthquake-resistant container bottom plate.

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