Bamboo fiber composite material plate as well as formula and production process thereof

Abstract

The invention relates to the field of composite materials, and particularly discloses a bamboo fiber composite material plate as well as a formula and a production process thereof. The bamboo fiber composite material plate comprises a surface layer, a core layer and a bottom layer which are compounded from top to bottom, the surface layer and the bottom layer are respectively formed by pressing mixed slurry of magnesium oxide, magnesium sulfate and bamboo powder, the core layer is formed by pressing mixed slurry of magnesium oxide, magnesium sulfate, bamboo fiber and bamboo powder, glass fiber cloth is laid in the core layer, and the surface layer, the core layer and the bottom layer are integrally formed by pressing. The three-layer structure is arranged, the bamboo powder is added into the surface layer and the bottom layer to be mixed and pressed, gaps are filled, the surface layer and the bottom layer of the plate have high density, and after the bamboo powder is added, the wear resistance is excellent; the bamboo fibers and the bamboo powder are added into the middle core layer, the fracture resistance of the board is greatly improved through the added bamboo fibers, the overall structure becomes more compact through the bamboo fibers mixed in the slurry, the bamboo fibers have the effect of embedded reinforcing ribs, and the load bearing strength and the fracture resistance of the board are greatly improved.

Description

Technical Field

[0001] The invention relates to the field of composite materials, in particular to a bamboo fiber composite material board. Background Art

[0002] There are many types of existing composite materials. High-strength and high-modulus fibers can be compounded with non-metallic matrices such as synthetic resins, carbon, graphite, ceramics, rubber, or metal matrices such as aluminum, magnesium, and titanium to form composite materials with their own characteristics. Common materials used for daily decoration include composite wood boards, plywood, and glass magnesium boards. Among them, glass magnesium boards are widely used as wall panels, ceiling panels, fireproof panels, waterproof panels, packaging boxes, etc. due to their advantages of high temperature resistance, flame retardancy, sound absorption, shock resistance, insect resistance, corrosion resistance, non-toxicity, tastelessness, and pollution-free. They can replace wood plywood to make wall skirts, doors and windows, door panels, furniture, etc., and can also be coated with blending paint and clear water paint on the surface as needed, and can be processed into various types of board surfaces. They can also be used in projects in humid environments such as basements and mines, and can be used in combination with a variety of thermal insulation materials to make composite thermal insulation panels.

[0003] During the preparation process of common glass magnesium boards, volatile substances are prone to produce holes, which reduces the density of the board, reduces the flexural strength, and reduces the load-bearing capacity due to the holes. If the glass magnesium board is to be used for paving the bottom of a path or for paving something like a plank road, its physical properties are insufficient.

[0004] The technical problem to be solved by the present application is: how to provide a composite material plate which is flame retardant, wear resistant, flexural resistant and has strong load-bearing capacity. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a bamboo fiber composite material board having flame retardancy, high bending resistance and load-bearing strength, and a formula and production process thereof.

[0006] The technical solution adopted by the present invention is:

[0007] The bamboo fiber composite material board comprises a surface layer, a core layer and a bottom layer which are composited from top to bottom. The surface layer and the bottom layer are respectively pressed and formed by a mixed slurry of magnesium oxide, magnesium sulfate and bamboo powder. The core layer is pressed and formed by a mixed slurry of magnesium oxide, magnesium sulfate, bamboo fiber and bamboo powder. Glass fiber cloth is laid in the core layer. The surface layer, the core layer and the bottom layer are pressed and formed as a whole.

[0008] The bamboo fiber composite material board of the present invention has a three-layer structure, bamboo powder is added to the surface layer and the bottom layer for mixing and pressing, and the gaps are filled. The surface layer and the bottom layer of the board have a very high density, and after the bamboo powder is added, the wear resistance is excellent; at the same time, the flame retardant property of the glass magnesium board itself is not affected, and it has the effects of non-toxic insect repellent and the like;

[0009] Bamboo fiber and bamboo powder are added to the middle core layer. The added bamboo fiber greatly improves the flexural resistance of the board. The mixed bamboo fiber in the slurry makes the overall structure tighter. The bamboo fiber plays the role of embedded reinforcement, and combined with the glass fiber cloth, the load-bearing and flexural strength of the board are greatly improved.

[0010] Since the density of bamboo fiber is lower than that of bamboo powder, the weight of the middle core layer will be lower than the surface layer and the bottom layer, and the thickness of the middle core layer is greater than the surface layer and the bottom layer, so that the weight of the overall board will not be too large.

[0011] Magnesium sulfate can be replaced by magnesium chloride or a mixed solution of magnesium sulfate and magnesium chloride.

[0012] The formula of the bamboo fiber composite material board includes a surface layer, a core layer and a bottom layer composited from top to bottom, and the surface layer and the bottom layer include the following components by weight:

[0013] 80-110 parts of magnesium oxide, 80-110 parts of magnesium sulfate solution, 60-90 parts of bamboo powder, and 1-3 parts of magnesium sulfate chemical modifier;

[0014] The core layer includes the following components by weight:

[0015] 80-110 parts of magnesium oxide, 80-110 parts of magnesium sulfate solution, 15-30 parts of bamboo fiber, 20-35 parts of bamboo powder, 1-3 parts of magnesium sulfate chemical modifier;

[0016] In some embodiments, glass fiber cloth is also laid in the core layer to improve strength.

[0017] In some embodiments, the magnesium sulfate solution can be replaced by a magnesium chloride solution, or a mixed solution of magnesium chloride and magnesium sulfate.

[0018] In some embodiments, the specification of the glass fiber cloth is 600 g / ㎡.

[0019] In some embodiments, the magnesium sulfate solution has a Baume degree of 28°.

[0020] In some embodiments, multiple layers of glass fiber cloth are laid to improve the overall flexural strength.

[0021] The production process of bamboo fiber composite material board, using the above formula, includes the following steps:

[0022] S1, preparing a magnesium sulfate solution, mixing the magnesium sulfate solution with magnesium oxide, bamboo powder and a magnesium sulfate chemical modifier to prepare a bottom layer and a surface layer slurry;

[0023] S2, mixing the magnesium sulfate solution with magnesium oxide, bamboo fiber, bamboo powder and magnesium sulfate chemical modifier to prepare a core layer slurry;

[0024] S3, injecting the bottom layer and the surface layer slurry into a preset mold, and rolling and forming them to obtain the surface layer;

[0025] S4, injecting the core layer slurry into a preset mold, laying it on the surface layer, and rolling it to obtain the surface layer and the core layer;

[0026] S5, injecting the bottom layer and the surface layer slurry into a preset mold, laying them on the core layer, and rolling forming them to obtain a three-layer composite board;

[0027] S6, leaving the three-layer composite board to stand for 12 hours for curing and forming;

[0028] S7, subjecting the three-layer composite board that has been cured to constant temperature curing for 8 days;

[0029] S8, performing surface processing on the three-layer composite board after curing to obtain a finished bamboo fiber composite material board.

[0030] In some embodiments, in step S4, the laying of the core layer slurry is divided into multiple times, and the glass fiber cloth is laid between two adjacent laying times.

[0031] In some embodiments, the preset mold includes a shaping portion, which is disposed on the inner bottom surface of the preset mold, and the shaping portion is used to form a shaping texture on the plate when the plate is roll-formed.

[0032] The shape textures include wood grain style, anti-slip groove style, and anti-slip protrusion style.

[0033] In some embodiments, step S1 further includes a colorant, which is mixed with the magnesium sulfate solution, magnesium oxide, bamboo powder and a magnesium sulfate chemical modifier.

[0034] The beneficial effects of the present invention are:

[0035] The bamboo fiber composite material board and its formula and production process greatly improve the overall flexural strength and load-bearing strength of the board by mixing bamboo fiber and bamboo powder in the preparation of the middle core layer; at the same time, bamboo powder is mixed in the preparation of the surface layer and the bottom layer, which effectively improves the overall density, so that the wear resistance and water tightness of the board surface are effectively improved;

[0036] The finished bamboo fiber composite material board has good flame retardancy, and is also anti-termite and non-toxic. After enhancing the surface load-bearing and flexural strength, it is very suitable for paving trails, plank roads in scenic spots, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of the bamboo fiber composite material board of the present invention;

[0038] Figure 2It is a structural schematic diagram of another embodiment of the bamboo fiber composite material board of the present invention.

[0039] The numbers and names in the figure correspond to each other as follows: 1. top layer; 2. core layer; 3. bottom layer; 4. glass fiber cloth. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] See also Figure 1 , the present invention provides a technical solution:

[0043] The bamboo fiber composite material board comprises a surface layer 1, a core layer 2 and a bottom layer 3 which are composited from top to bottom. The surface layer 1 and the bottom layer 3 are respectively pressed and formed by a mixed slurry of magnesium oxide, magnesium sulfate and bamboo powder, the core layer 2 is pressed and formed by a mixed slurry of magnesium oxide, magnesium sulfate, bamboo fiber and bamboo powder, and the surface layer 1, the core layer 2 and the bottom layer 3 are pressed and formed as a whole.

[0044] In the technical solution of this embodiment, the formula of the slurry used in the surface layer 1 and the bottom layer 3 is the same, specifically:

[0045] 100 parts of magnesium oxide, 100 parts of 28 degrees Baume magnesium sulfate solution, 90 parts of bamboo powder, and 2 parts of magnesium sulfate chemical modifier;

[0046] The specific formula of core layer 2 slurry is:

[0047] 100 parts of magnesium oxide, 100 parts of magnesium sulfate solution, 30 parts of bamboo fiber, 35 parts of bamboo powder, and 2 parts of magnesium sulfate chemical modifier.

[0048] The slurry of the above formula is prepared by the following process:

[0049] S1, prepare magnesium sulfate solution to obtain 28 degrees Baume magnesium sulfate solution, mix the magnesium sulfate solution with magnesium oxide, bamboo powder and magnesium sulfate chemical modifier according to the above weight formula to prepare bottom layer and surface layer slurry;

[0050] S2. Mixing the magnesium sulfate solution with magnesium oxide, bamboo fiber, bamboo powder and magnesium sulfate chemical modifier according to a specific formula to prepare a core layer slurry;

[0051] S3, injecting the bottom layer and the surface layer slurry into a preset mold, and rolling and forming, to obtain the surface layer 1;

[0052] S4, injecting the core layer slurry into a preset mold, laying it on the surface layer, and rolling it to obtain the surface layer 1 and the core layer 2;

[0053] S5, injecting the bottom layer and the surface layer slurry into a preset mold, laying them on the core layer, and rolling forming them to obtain a three-layer composite board;

[0054] S6, leaving the three-layer composite board to stand for 12 hours for curing and forming;

[0055] S7, subjecting the three-layer composite board to constant temperature curing for 8 days, with the temperature controlled at 40° C. to 50° C.;

[0056] S8. The cured three-layer composite board is subjected to surface treatment to obtain a finished bamboo fiber composite board. The surface treatment process includes applying a waterproofing agent.

[0057] In this embodiment, a wood grain shaping portion is provided on the inner bottom surface of the preset mold, and a wood grain texture shape is formed on the surface layer contacting the inner bottom surface of the mold, thereby increasing the aesthetics.

[0058] At the same time, colorants can be added according to actual needs. The colorants do not react with the materials themselves and have no effect on the performance. They only have an aesthetic effect and will not be elaborated here.

[0059] Example 2

[0060] like Figure 2 As shown, in this embodiment, on the basis of Example 1, a glass fiber cloth 4 is laid on the core layer 2. In the actual process, the laying of the core layer slurry is divided into two times. After the first core layer slurry is laid, the glass fiber cloth 4 is laid, and the second core layer slurry is laid on the glass fiber cloth 4, and rolled in parallel.

[0061] Test Example 1

[0062] On the basis of Example 1, 75 parts of bamboo powder were selected in the surface layer and the bottom layer slurry.

[0063] Test Example 2

[0064] On the basis of Example 1, 60 parts of bamboo powder were selected in the surface layer and the bottom layer slurry.

[0065] Test Example 3

[0066] Based on Example 1, 20 parts of bamboo fiber are selected in the core layer slurry.

[0067] Test Example 4

[0068] On the basis of Example 1, 20 parts of bamboo fiber and 25 parts of bamboo powder are selected in the core layer slurry.

[0069] Test Example 5

[0070] Based on Example 2, two layers of glass fiber cloth are selected.

[0071] Comparative Example 1

[0072] The conventional magnesium sulfate board preparation process is adopted, and 100 parts of magnesium oxide, 100 parts of 28 Baume magnesium sulfate solution, 90 parts of wood powder and 2 parts of magnesium sulfate chemical modifier are mixed to prepare the magnesium sulfate board.

[0073] Comparative Example 2

[0074] On the basis of Comparative Example 1, alkali-resistant glass fiber cloth was added.

[0075] For the above embodiments, test examples and comparative examples, the industry standard JC688-2006 "Glass Magnesium Flat Plate" was uniformly adopted for the flexural performance test, and the national standard (GB / T24508-2020) was adopted for the surface wear resistance test to obtain the data in Table 1 below. The performance test was carried out according to GB8624-2012 "Classification of Combustion Performance of Building Materials and Products", and the data in Table 2 below were obtained.

[0076] project Flexural strength(MPa) Anti-halogen Abrasion resistance (g / 100r) Example 1 20 No water drops, no moisture 0.04 Example 2 22 No water drops, no moisture 0.04 Test Example 1 19.4 No water drops, no moisture 0.05 Test Example 2 19.1 No water drops, no moisture 0.06 Test Example 3 18.6 No water drops, no moisture 0.04 Test Example 4 18.4 No water drops, no moisture 0.04 Test Example 5 23 No water drops, no moisture 0.04 Comparative Example 1 9 No water drops, no moisture 0.09 Comparative Example 2 12 No water drops, no moisture 0.09

[0077] Table 1

[0078]

[0079]

[0080] Table 2

[0081] It can be seen from Table 1 that with the decrease of bamboo powder content, the flexural strength and wear resistance of the board decrease. It can be concluded that the increase of bamboo powder content is conducive to improving the flexural strength and wear resistance of the board; with the decrease of bamboo fiber content, the flexural strength of the board also decreases;

[0082] The flexural strength of Example 2 is better than that of Example 1, and the flexural strength of Test Example 5 is better than that of Example 2, which means that the addition of glass fiber cloth increases the flexural strength of the plate, and multiple layers of glass fiber cloth can also enhance the flexural strength of the plate.

[0083] The flexural strength and wear resistance of the embodiment and the test example are much higher than those of the conventional magnesium sulfate board, which indicates that the flexural strength and wear resistance are greatly improved after the bamboo powder and bamboo fiber are added to the present invention.

[0084] As for combustion performance, all embodiments, test examples and comparative examples can reach the non-combustible A (A1) grade of national standard bricks and can achieve flame retardant effect.

[0085] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Bamboo fiber composite board, It is characterized in that It comprises a surface layer, a core layer and a bottom layer which are composited from top to bottom. The surface layer and the bottom layer are respectively pressed and formed by a mixed slurry of magnesium oxide, magnesium sulfate and bamboo powder. The core layer is pressed and formed by a mixed slurry of magnesium oxide, magnesium sulfate, bamboo fiber and bamboo powder. The surface layer, the core layer and the bottom layer are pressed and formed as a whole.

2. The bamboo fiber composite material board according to claim 1, It is characterized in that Glass fiber cloth is laid in the core layer.

3. The bamboo fiber composite material board according to claim 1, It is characterized in that The magnesium sulfate can be replaced by magnesium chloride or a mixed solution of magnesium sulfate and magnesium chloride.

4. The formula of bamboo fiber composite board, It is characterized in that It comprises a surface layer, a core layer and a bottom layer which are composited from top to bottom, wherein the surface layer and the bottom layer comprise the following components in parts by weight: 80-110 parts of magnesium oxide, 80-110 parts of magnesium sulfate solution, 60-90 parts of bamboo powder, and 1-3 parts of magnesium sulfate chemical modifier; The core layer comprises the following components in parts by weight: 80-110 parts of magnesium oxide, 80-110 parts of magnesium sulfate solution, 15-30 parts of bamboo fiber, 20-35 parts of bamboo powder, 1-3 parts of magnesium sulfate chemical modifier; Glass fiber cloth is also laid in the core layer.

5. The formula of the bamboo fiber composite material board according to claim 4, It is characterized in that The magnesium sulfate solution can be replaced by a magnesium chloride solution, or a mixed solution of magnesium chloride and magnesium sulfate.

6. The formula of the bamboo fiber composite material board according to claim 4, It is characterized in that The glass fiber cloth is laid in multiple layers.

7. A process for producing a bamboo fiber composite material board, using the formula described in any one of claims 3 to 6, It is characterized in that The steps include: S1, preparing a magnesium sulfate solution, mixing the magnesium sulfate solution with magnesium oxide, bamboo powder and a magnesium sulfate chemical modifier to prepare a bottom layer and a surface layer slurry; S2, mixing the magnesium sulfate solution with magnesium oxide, bamboo fiber, bamboo powder and magnesium sulfate chemical modifier to prepare a core layer slurry; S3, injecting the bottom layer and the surface layer slurry into a preset mold, and rolling and forming them to obtain the surface layer; S4, injecting the core layer slurry into a preset mold, laying it on the surface layer, and rolling it to obtain the surface layer and the core layer; S5, injecting the bottom layer and the surface layer slurry into a preset mold, laying them on the core layer, and rolling forming them to obtain a three-layer composite board; S6, leaving the three-layer composite board to stand for 12 hours for curing and forming; S7, subjecting the three-layer composite board that has been cured to constant temperature curing for 8 days; S8, performing surface processing on the three-layer composite board after curing to obtain a finished bamboo fiber composite material board.

8. The production process of bamboo fiber composite material board according to claim 7, It is characterized in that In the step S4, the laying of the core layer slurry is divided into multiple times, and the glass fiber cloth is laid between two adjacent laying times.

9. The production process of bamboo fiber composite material board according to claim 7, It is characterized in that The preset mold includes a shaping part, which is arranged on the inner bottom surface of the preset mold. The shaping part is used to form a shaping texture on the surface layer of the plate when the plate is roll-formed.

10. The production process of bamboo fiber composite material board according to claim 7, It is characterized in that The step S1 also includes a colorant, which is mixed with a magnesium sulfate solution, magnesium oxide, bamboo powder and a magnesium sulfate chemical modifier.

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