Bamboo core FRP sandwich panel filled with light construction waste and preparation process thereof

Abstract

The invention belongs to the technical field of building materials, and relates to a bamboo core FRP sandwich panel filled with light building waste and a preparation process of the bamboo core FRP sandwich panel. The bamboo core FRP sandwich board comprises a glass fiber cloth transverse wrapping layer, a glass fiber cloth longitudinal wrapping layer, a glass fiber cloth annular wrapping layer, an upper surface layer, bamboo rings, a light construction waste filling material and a lower surface layer, the bamboo cavities are filled with light construction waste materials to form a core layer, and after the core layer is compounded with an upper surface layer and a lower surface layer, glass fiber cloth is used for wrapping in the circumferential direction, the longitudinal direction and the transverse direction to form the wallboard. The structural characteristics of thin and hollow wall and excellent compression resistance and toughness of bamboos are utilized, the bamboo cavities are filled with the light building waste materials which are granular after being crushed, and the bamboo cavities and the light building waste materials jointly form the wallboard light multifunctional core layer which supports the upper surface layer and the lower surface layer and is good in heat insulation and sound insulation performance; the raw bamboos can be cut into bamboo sections with any length according to performance requirements, so that the customization capability of the wallboard is greatly improved. The bamboo sections are tightly arranged according to the principle that side lines are attached and from outside to inside, and the three-layer sandwich structure is externally wrapped with glass fiber cloth, so that the three-direction restraining force is provided for the internal structure, and the overall rigidity and strength of the component are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials and relates to a bamboo core FRP sandwich panel filled with light construction waste and a preparation process thereof. Background Art

[0002] The existing materials commonly used in building envelope structures have poor corrosion resistance and thermal insulation properties, cannot meet the needs of light weight and high strength, and are inconsistent with my country's green building development policy.

[0003] There is a lack of effective development of recycling bamboo and lightweight construction waste materials for building materials. Summary of the invention

[0004] The object of the present invention is to provide a sandwich panel for a building exterior envelope structure having excellent corrosion resistance, excellent heat and sound insulation performance, high bearing capacity and environmental friendliness and a preparation process thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bamboo core FRP sandwich panel filled with light construction waste comprises a glass fiber cloth transverse wrapping layer 1, a glass fiber cloth longitudinal wrapping layer 2, a glass fiber cloth circumferential wrapping layer 3, an upper layer 4, a bamboo ring 5, a light construction waste filling material 6 and a lower layer 7. The light construction waste material is filled in the bamboo cavity to form a core layer, and after the core is compounded with the upper layer and the lower layer, the glass fiber cloth is used to wrap them in the circumferential, longitudinal and transverse directions to form a wall panel.

[0007] A preparation process of a bamboo core FRP sandwich panel filled with lightweight construction waste, the specific steps are as follows:

[0008] Step 1: Process the raw bamboo material: ① Remove the green bamboo on the surface of the raw bamboo; ② Cut the bamboo material according to the required size, check with a steel square to ensure that the bamboo ring diameter surface is perpendicular to the end surface; ③ Soak in preservative solution; ④ Dry;

[0009] Step 2: Processing lightweight construction waste: crushing lightweight materials such as waste wood, waste plastic and waste cloth into granular materials such as wood chips and fragments;

[0010] Step 3, making the upper layer and the lower layer (glass fiber reinforced composite material plate): ① prepare the mold, apply release wax on the surface after grinding and cleaning; ② cut the glass fiber woven cloth required for the upper layer and the lower layer; ③ prepare the matrix material mixed glue; ④ spread the mixed glue after laying the release cloth on the mold, lay a layer of glass fiber cloth flatly, keep the fabric immersed in the glue to saturate it, repeat the operation according to the designed number of layers, scrape the surface, and discharge bubbles and excess glue to make the surface flat; ⑤ cure at room temperature; ⑥ polish all around to make it flat;

[0011] Step 4, making a three-layer sandwich component: ① Ensure that the outer surface of the bamboo segment treated in step 1 is completely coated with glue; ② Based on the principle of "edge line fitting, from outside to inside", first arrange the bamboo rings on the four edges of the lower GFRP board, at this time the outer edges of the bamboo rings and the outer edges of the board are in the same plane, and then place them inward in sequence, with the bamboo rings tangent to each other and tightly arranged, and cold press for 120 minutes at a pressure of 0.8MPa; ③ Fill the bamboo ring cavity with crushed lightweight construction waste granular materials; ④ After applying glue to the lower surface of the upper GFRP board, place it on the bamboo segment, align the edges, and also cold press for 120 minutes at a pressure of 0.8MPa; ⑤ Place the prepared three-layer sandwich component in the open air to achieve a balanced moisture content and fully cured glue;

[0012] Step 5: Wrap the three-layer sandwich component: ① Cut the required glass fiber woven cloth according to the size; ② First, wrap the component tightly in the circumferential direction with the glass fiber cloth, and apply glue to saturate the fabric; then wrap the component tightly in the longitudinal direction with the glass fiber cloth, and apply glue to saturate the fabric; finally, wrap the component tightly in the transverse direction with the glass fiber cloth, and apply glue to saturate the fabric; ③ After curing, the finished wallboard is obtained. When wrapping, it fits tightly, so that the outer wrapping layer generates a three-dimensional constraint force on the internal three-layer sandwich component.

[0013] Further features, the preservative solution is prepared by mixing ACQ bamboo and wood preservative and water in a ratio of 1:20 (the main chemical component of ACQ is alkyl copper amine compound, which can combine with the fibers in bamboo and wood materials to inhibit the growth of microorganisms). The antiseptic treatment and drying treatment can prevent damage such as fungal erosion, rot and insect infestation, extend the service life, and improve its stability and durability.

[0014] Further features, the matrix material mixed glue liquid uses epoxy resin glue, curing agent and accelerator configured in proportion, taking 100 grams of resin as an example, 100 grams of resin is poured into a plastic bucket, 1 gram of accelerator is added, stirred evenly, and then 2 grams of curing agent is added, and stirred thoroughly after adding to avoid uneven curing.

[0015] As a further feature, the bamboo ring used in the core layer may also be other hollow wooden cylinders (the interior of which may or may not be filled).

[0016] As a further feature, the glass fiber material used in the upper and lower layers and the outer covering layer can be replaced by other fiber materials.

[0017] A further feature is that the epoxy resin used as the base material of the upper and lower layers and the outer wrapping layer can be replaced by other resin materials.

[0018] The bamboo core FRP sandwich panel filled with lightweight construction waste of the present invention integrates the functions of load bearing, heat insulation and sound insulation, and provides a solution to the problems existing in the commonly used materials of the existing building exterior envelope structure. The GFRP material and the treated bamboo material used in the present invention both have good corrosion resistance, and the sealed structure can also improve the corrosion resistance of the components, which can effectively reduce the maintenance cost during the service life of the material; the bamboo cavity is filled with recycled lightweight construction waste, which improves the overall stability and heat insulation and sound insulation performance of the core layer, and is of great significance to saving resources and protecting the environment; the outer wrapping structure and the sandwich structure both contribute to improving the overall mechanical properties and sound insulation and heat insulation performance, and fully improve the use efficiency of each component material.

[0019] The present invention utilizes the thin-walled hollow structural characteristics, excellent compression resistance and toughness of bamboo itself, and fills the bamboo cavity with crushed and granular lightweight construction waste materials. The two together form a lightweight multifunctional core layer of the wall panel that supports the upper and lower layers and has good thermal insulation and sound insulation properties. The original bamboo can be cut into bamboo segments of any length according to performance requirements, which greatly improves the customization capability of the wall panel.

[0020] Lightweight construction waste materials are environmentally friendly raw materials, but they are difficult to dispose of without pollution. Reasonable use of them to prepare wall panels for external protective structures can improve the resource recycling rate of construction waste, which is in line with the concepts of sustainable development and environmental protection.

[0021] The bamboo segments are closely arranged based on the principle of "fitting the edges, from outside to inside", and the three-layer sandwich structure is wrapped with glass fiber cloth to provide three-way constraint force for the internal structure and enhance the overall stiffness and strength of the component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1-a It is a schematic top view of the arrangement of the core layer bamboo segments of the present invention;

[0023] Figure 1-b This is an overall schematic diagram of the arrangement of the core layer bamboo segments of the present invention;

[0024] Figure 2 It is an overall schematic diagram of a sandwich panel formed by a bamboo core and upper and lower layers of GFRP according to the present invention;

[0025] Figure 3-a This is a diagram illustrating the outer wrapping hoop winding direction of the present invention;

[0026] Figure 3-b This is a diagram illustrating the longitudinal winding direction of the outer package of the present invention;

[0027] Figure 3-c This is a diagram illustrating the transverse winding direction of the outer package of the present invention;

[0028] Figure 4 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 5 It is a layered cross-sectional view of the structure of the present invention;

[0030] In the figure: 1. lateral wrapping layer of glass fiber cloth, 2. longitudinal wrapping layer of glass fiber cloth, 3. circumferential wrapping layer of glass fiber cloth, 4. upper layer, 5. bamboo ring, 6. light construction waste filling material, 7. lower layer. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and the manufacturing process.

[0032] Example 1

[0033] As shown in the figure, cut a batch of bamboo rings with consistent height and perpendicular diameter and end faces according to the size requirements to ensure the height error of ±0.5mm; use alcohol cotton pads to remove debris from the outer surface of the bamboo rings to ensure that the outer surface is dry and dust-free, and apply glue on the outer surface of the bamboo rings for later use; first arrange the bamboo rings along the four sides of the GFRP surface layer, with the outer edge of the bamboo ring and the outer edge of the board in the same plane, and then arrange them inwards in sequence to form a core layer of bamboo rings that are tangent to each other and closely arranged.

[0034] Glue is applied on the lower surface of the bamboo ring core layer to bond it to the lower layer of GFRP. Initially, the bonding is carried out under a pressure of 0.8 MPa for 120 minutes. Glue is applied on the upper surface of the bamboo ring core layer to bond it to the upper layer of GFRP. Initially, the bonding is carried out under a pressure of 0.8 MPa for 120 minutes. Then, the three-layer sandwich component is placed in the open air until the moisture content reaches equilibrium and the glue is completely cured.

[0035] First, use sandpaper to polish the upper and lower surfaces of the bamboo ring-GFRP sandwich panel, and then use alcohol cotton pads to clean the dust to ensure that the surface is dry and clean; cut the corresponding glass fiber woven cloth according to the size of the sandwich panel; first use the glass fiber cloth to tightly wrap the component in the circumferential direction for two weeks, with an overlap length of 120mm, apply glue to saturate the fabric, and then use the glass fiber cloth to tightly wrap the component in the longitudinal direction for two weeks after preliminary curing, with an overlap length of 120mm, and apply glue to saturate the fabric. After preliminary curing, finally use the glass fiber cloth to tightly wrap the component in the transverse direction for two weeks, with an overlap length of 120mm, and apply glue to saturate the fabric; let it stand to allow the glue to completely cure.

Claims

1. A bamboo core FRP sandwich panel filled with lightweight construction waste, characterized in that: It comprises a glass fiber cloth transverse wrapping layer (1), a glass fiber cloth longitudinal wrapping layer (2), a glass fiber cloth circumferential wrapping layer (3), an upper layer (4), a bamboo ring (5), a lightweight construction waste filling material (6) and a lower layer (7); the lightweight construction waste material is filled in the bamboo cavity to form a core layer, and after the core is compounded with the upper layer and the lower layer, the glass fiber cloth is used to wrap in the circumferential, longitudinal and transverse directions to form a wall panel.

2. The preparation process of the bamboo core FRP sandwich panel filled with light construction waste as claimed in claim 1, characterized in that Here are the steps: Step 1: Process the raw bamboo material: ① Remove the green bamboo on the surface of the raw bamboo; ② Cut the bamboo material according to the required size, check with a steel square to ensure that the bamboo ring diameter surface is perpendicular to the end surface; ③ Soak in preservative solution; ④ Dry; Step 2: Processing lightweight construction waste: crushing lightweight materials such as waste wood, waste plastic and waste cloth into granular materials such as wood chips and fragments; Step 3, making the upper layer and the lower layer (glass fiber reinforced composite material plate): ① prepare the mold, apply release wax on the surface after grinding and cleaning; ② cut the glass fiber woven cloth required for the upper layer and the lower layer; ③ prepare the matrix material mixed glue; ④ spread the mixed glue after laying the release cloth on the mold, lay a layer of glass fiber cloth flatly, keep the fabric immersed in the glue to saturate it, repeat the operation according to the designed number of layers, scrape the surface, and discharge bubbles and excess glue to make the surface flat; ⑤ cure at room temperature; ⑥ polish all around to make it flat; Step 4, making three-layer sandwich components: ① Ensure that the outer surface of the bamboo segment treated in step 1 is completely coated with glue; ② Based on the principle of "edge line fitting, from outside to inside", first arrange the bamboo rings on the four edges of the lower GFRP board, at this time the outer edges of the bamboo rings and the outer edges of the board are in the same plane, and then place them inward in sequence, with the bamboo rings tangent to each other and arranged tightly, and cold press for 120 minutes at a pressure of 0.8MPa; ③ Fill the bamboo ring cavity with crushed lightweight construction waste granular materials; ④ After applying glue to the lower surface of the upper GFRP board, place it on the bamboo segment, align the edges, and also cold press for 120 minutes at a pressure of 0.8MPa; ⑤ Place the prepared three-layer sandwich component in the open air to achieve a balanced moisture content and fully cured glue; Step 5, wrapping the three-layer sandwich component: ① Cut the required glass fiber woven cloth according to the size; ② First, wrap the component tightly along the circumferential direction with the glass fiber cloth, and apply glue to saturate the fabric; then wrap the component tightly along the longitudinal direction with the glass fiber cloth, and apply glue to saturate the fabric; finally, wrap the component tightly along the transverse direction with the glass fiber cloth, and apply glue to saturate the fabric; ③ After curing, the finished wall panel is obtained; the outer wrapping layer is tightly fitted during winding, so that the outer wrapping layer exerts a three-way constraint force on the internal three-layer sandwich component.

3. The preparation process of the bamboo core FRP sandwich panel filled with light construction waste as claimed in claim 2, characterized in that: The preservative solution is made of ACQ bamboo and wood preservative and water in a ratio of 1:

20. The antiseptic treatment and drying treatment can prevent damage such as fungal erosion, rot and insect infestation, extend the service life, and improve its stability and durability.

4. The preparation process of the bamboo core FRP sandwich panel filled with light construction waste as claimed in claim 2, characterized in that: The matrix material mixed glue is prepared by mixing epoxy resin glue, curing agent and accelerator in proportion. Taking 100 grams of resin as an example, pour 100 grams of resin into a plastic bucket, add 1 gram of accelerator, stir evenly, then add 2 grams of curing agent, stir thoroughly after adding to avoid uneven curing.

5. The preparation process of the bamboo core FRP sandwich panel filled with light construction waste as claimed in claim 2, characterized in that: The bamboo rings used for the core layer may also be other hollow wooden cylinders, which may be filled or not filled inside.

6. The preparation process of the bamboo core FRP sandwich panel filled with light construction waste as claimed in claim 2, characterized in that: The glass fiber materials used in the upper and lower layers and the outer covering layer are replaced by other fiber materials.

7. The preparation process of the bamboo core FRP sandwich panel filled with light construction waste as claimed in claim 2, characterized in that: The epoxy resin used as the base material of the upper and lower layers and the outer wrapping layer is replaced by other resin materials.

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