Antistatic bamboo-plastic composite board

Abstract

The application discloses an antistatic bamboo-plastic composite board, which comprises a base plate; the base plate is a bamboo-plastic composite board; a center blind groove is formed in the middle position of one side plate body of the base plate; a plurality of annular blind grooves are concentrically arranged on the outer edge of the center blind groove; an outer metal ring is embedded in the annular blind groove; an inner metal ring is embedded on the outer edge of the center blind groove; the outer metal rings located adjacently and the outer metal ring and the inner metal ring are connected through a conductor at a communication part position; a grounding pin is connected to the outermost outer metal ring; a leveling layer is lined on the inner side of the inner metal ring of the center blind groove; 2-5 layers of heavy bamboo sheets with a conductive metal mesh surface are laminated and press-fitted on the surface of the leveling layer; and the conductive metal mesh surface is pulled and fixed on the inner metal ring. The application has better structural stability, excellent antistatic performance and can be used as a decoration material for wall and floor decoration in an antistatic environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artificial board, in particular to an antistatic bamboo-plastic composite board. BACKGROUND

[0002] With the increasing shortage of wood resources and the improvement of people's living conditions, more and more materials are applied in building materials, such as various natural fiber regenerated materials, plastic materials, stone materials, metal materials and other single materials, and composite materials such as wood-plastic materials, bamboo-plastic materials and stone-plastic materials are applied in the field of board materials. Among them, bamboo materials as fast-growing materials have been increasingly valued because of their characteristics of abundant resources, fast growth, short cultivation period and easy cultivation and management. Using bamboo instead of wood effectively reduces the demand for wood, and using fast-growing materials not only saves costs but also protects the environment. However, due to the structural characteristics of bamboo, the density difference is easy to occur in the internal of the formed board, resulting in unstable physical properties of the formed bamboo board. When the surface layer is subjected to stress such as pressure and impact force, deformation failure is easy to occur.

[0003] Based on the above reasons, some manufacturers have developed bamboo-plastic composite materials by using bamboo as raw material and plastic for compounding. The board prepared by this kind of bamboo-plastic composite material has a series of advantages such as light weight, corrosion resistance, high temperature resistance, aging resistance, easy degradation, which helps to improve the utilization value of bamboo, reduce the use of plastic and reduce environmental pollution, and has great development and utilization prospect. However, the bamboo-plastic composite board in the prior art is usually formed by layering and hot pressing, which has defects in strength and stability during the forming process. Cracks are easy to form in the internal after a period of use, and then develop and form interlayer peeling or even breakage failure. In addition, the bamboo-plastic composite board also has defects in wear resistance and decoration, and is relatively single in functionality, which cannot meet the use requirements of some specific fields. If the traditional bamboo-plastic composite board can be improved, such as increasing the antistatic property, it can be suitable for some antistatic occasions (such as electronic workshops, hospital operating rooms, space launch centers, communication machine rooms, traffic control centers, public security and fire alarm command centers, airport air control centers and various information centers), which can effectively improve its application range and application prospect, and create new market value. SUMMARY

[0004] The technical problem solved by the present application is to provide an antistatic bamboo-plastic composite board to solve the defects in the above technical background.

[0005] The technical problem solved by the present application is solved by the following technical solution:

[0006] An antistatic bamboo-plastic composite board, comprising a base plate.

[0007] The substrate is a bamboo-plastic composite board, the substrate has a flat first surface, and a center blind groove is formed in the middle of the plate body of the second surface, the outer edge of the center blind groove is formed with a plurality of concentric annular blind grooves, and a communication part is formed between the adjacent annular blind grooves and between the innermost annular blind groove and the center blind groove.

[0008] An outer metal ring matching the size of the annular blind groove is embedded in the annular blind groove, an inner metal ring matching the outer contour of the center blind groove is embedded in the outer edge of the center blind groove, the adjacent outer metal rings and the outer metal ring and the inner metal ring are connected by a conductor at the communication part position, and a grounding pin is connected to the outermost outer metal ring;

[0009] A leveling layer is lined inside the inner metal ring of the center blind groove, 2-5 layers of heavy bamboo sheet are laminated and pressed on the surface of the leveling layer, the heavy bamboo sheets and the leveling layer are fixed by a resin bonding layer, and a conductive metal mesh surface is formed in the corresponding resin bonding layer, and the conductive metal mesh surface is pulled out and fixed on the inner metal ring;

[0010] The heavy bamboo sheet and the inner metal ring are flush with the surface of the substrate on the second surface of the substrate, and the outer metal ring is flush with or slightly protrudes from the second surface.

[0011] As a further limitation, the heavy bamboo sheet is obtained by:

[0012] The bamboo is dried to a moisture content of less than 15-18%, then crushed into bamboo bundles, then the bamboo bundles are further dried to a moisture content of less than 10%, then subjected to alkali treatment and silane coupling agent treatment, then subjected to impregnation treatment, then taken out and laid in a mold, then subjected to high-temperature and high-pressure heat curing treatment to obtain a heavy bamboo sheet, and the bamboo fiber content of the heavy bamboo sheet is 45-52%.

[0013] As a further limitation, the depth of the annular blind groove is 1 / 3-2 / 3 of the thickness of the substrate.

[0014] As a further limitation, the area of the center blind groove is 1 / 9-1 / 8 of the cross-sectional area of the substrate, and the depth is 2-5 mm shallower than the depth of the annular blind groove.

[0015] As a further limitation, the outer metal ring and the inner metal ring are one of aluminum rings, copper rings, copper alloy rings, and aluminum alloy rings of the same material; and the outer metal ring is a thin-walled metal ring with a wall thickness of 2-5 mm.

[0016] As a further limitation, the annular surface of the inner metal ring is formed with assembly parts for fixed assembly of the conductive metal mesh surface, the assembly parts are provided with a set of through holes consistent with the number of conductive metal mesh surfaces in the height direction, the set of through holes includes a plurality of through holes arranged in a ring shape, and the conductive metal mesh surface is worn on the through holes to complete the assembly.

[0017] As a further limitation, the leveling layer is a polyurethane resin layer doped with glass fibers.

[0018] As a further limitation, the outer metal ring is flush with the second surface or slightly protrudes from the second surface.

[0019] Beneficial effects: The anti-static bamboo-plastic composite board disclosed by the application has better structural strength and stability, which collects electric charges by using the conductive metal mesh surface and the inner and outer metal rings, and then introduces the static current into the ground through the grounding pin, so that the environmental static electricity accumulated in the board area can be eliminated, and the anti-static performance is better. It can be used as an insulating building material for wall and floor decoration in anti-static occasions, such as electronic workshops, hospital operating rooms, aerospace launch centers, communication machine rooms, traffic control centers, public security and fire alarm command centers, airport air control centers, and various information centers, to eliminate the harm caused by environmental static electricity. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The single-sided structure schematic diagram of the preferred embodiment of the application.

[0021] 1, base plate; 2, conductor; 3, outer metal ring; 4, leveling layer; 5, heavy bamboo sheet; 6, conductive metal mesh surface; 7, grounding pin; 8, inner metal ring. DETAILED DESCRIPTION

[0022] In order to better understand the technical personnel in the technical field of the application scheme, and make the technical means, creative features, purposes and effects of the application easy to understand, the technical solutions in the embodiments of the application are described clearly and completely below in combination with specific drawings.

[0023] This embodiment is only a part of the embodiments of the application, and represents all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the application. It should be noted that the terms in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and in addition, the terms "include" and "have" and their any variants are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed.

[0024] Referring to Figure 1 The anti-static bamboo-plastic composite board of the present application comprises a base plate 1, which is a bamboo-plastic composite board, prepared by the following method:

[0025] The bamboo is first dried to a moisture content of less than 15-18%, then crushed into bamboo bundles, and then dried to a moisture content of less than 10%. The bamboo bundles are then subjected to alkali treatment and silane coupling agent treatment. The alkali treatment is carried out by immersing the bamboo bundles in a 45 g / L KOH solution at a temperature of 90°C for 30-45 min. The silane coupling agent treatment is carried out by immersing the bamboo bundles in a 1.5% silane coupling agent KH570 solution for 90-120 min, with stirring to improve the interfacial compatibility between the bamboo bundles and the subsequent polyurethane resin. After the alkali treatment and the silane coupling agent treatment, the bamboo bundles are subjected to a polyurethane resin impregnation treatment to obtain modified bamboo fibers.

[0026] The following components are weighed out in parts by mass: 54% PP plastic, 7% bamboo charcoal powder, 25% modified bamboo fibers, 3% polyurethane resin adhesive, 5% lubricant paraffin, and 6% coupling agent titanate. The above components are mixed in a stirrer, and then stirred and cast into a bamboo-plastic board.

[0027] The upper surface of the base plate 1 is planar, and the lower surface is formed with two annular blind grooves and a central blind groove. The central blind groove is formed in the middle of the plate body of the lower surface of the base plate 1, and the two annular blind grooves are formed on the outer edge of the central blind groove.

[0028] The depth of the annular blind grooves is 2 / 3 of the height of the base plate 1, and the ring thickness is 2.5 mm. The area of the central blind groove is 1 / 9 of the cross-sectional area of the base plate 1, and the depth is 2.5 mm shallower than the depth of the annular blind grooves. The two annular blind grooves are concentrically arranged on the outer side of the central blind groove, and a communication part is formed between the adjacent annular blind grooves and between the innermost annular blind groove and the central blind groove.

[0029] In this embodiment, an outer metal ring 3 matching the size of the annular blind groove is formed in the annular blind groove, and an inner metal ring 8 abutting the outer contour of the central blind groove is formed at the outer contour position of the central blind groove. The outer metal ring 3 and the inner metal ring 8 are copper alloy rings of the same material. The positionally adjacent outer metal rings 3 and the outer metal ring 3 and the inner metal ring 8 are connected by a conductor 2 at the communication part position, and the outermost outer metal ring 3 is connected to a grounding pin 7. The grounding pin 7 is embedded in the wall surface or the ground surface during the assembly of the anti-static bamboo-plastic composite board as a wallboard or a floorboard on the wall surface or the ground surface.

[0030] The central blind groove has a leveling layer 4 installed on the inner side of the inner metal ring 8. The leveling layer 4 is a polyurethane resin layer doped with glass fiber, wherein the mass ratio of glass fiber doping is 9-15%. A composite reconstituted bamboo sheet layer is pressed and fixed onto the outer surface of the leveling layer 4 by a stacking method. This composite reconstituted bamboo sheet layer consists of three layers of reconstituted bamboo sheets 5, in which the bamboo fiber content is 48%, and is prepared by the following method:

[0031] Using the modified bamboo fiber obtained by the aforementioned method as raw material, after impregnation, the bamboo fiber is taken out and laid in a mold, and then subjected to high temperature and high pressure heat curing treatment to obtain reconstituted bamboo sheets.

[0032] The two adjacent bamboo sheets 5 in the composite bamboo sheet layer and the top bamboo sheet 5 and the leveling layer 4 are bonded with polyurethane resin. A conductive metal mesh 6 is formed in the polyurethane resin bonding layer. The outer side of the conductive metal mesh 6 is pulled and fixed to the inner metal ring 8.

[0033] To achieve the assembly and fixation of the conductive metal mesh 6 on the inner metal ring 8, an assembly part for fixing the conductive metal mesh 6 is formed on the ring surface of the inner metal ring 8. The assembly part includes two sets of through holes arranged along the height direction. Each set of through holes is arranged in a ring on the same horizontal plane of the inner metal ring 8, and the conductive metal mesh 6 is inserted into the through hole positions in a manner similar to a badminton racket / tennis racket. The two sets of through holes correspond to the gap positions between each pair of the three layers of bamboo sheets 5, so that the conductive metal mesh 6 can be assembled in a tensioned state at these positions.

[0034] After assembly, the composite bamboo sheet layer is slightly higher than the lower surface of the substrate 1 on its outer surface, and can remain flush with the lower surface of the substrate after surface polishing. The corresponding outer metal ring 3 is pressure-assembled into the corresponding annular blind groove by interference fit, and its outer side is flush with the lower surface of the substrate 1 or slightly protrudes from the lower surface of the substrate 1 by 2-3 mm.

[0035] In this embodiment, the bamboo fiber bundles obtained by two drying processes are treated with alkali treatment and silane coupling agent treatment. Compared with the unmodified bamboo fiber bundles, the alkali treatment increases the crystallinity of the bamboo fibers in the bamboo fiber bundles, and the coupling agent modification improves the interfacial compatibility between the bamboo fibers and polyurethane resin in the bamboo fiber bundles.

[0036] In this embodiment, the upper surface of the antistatic bamboo-plastic composite board is the outer surface, which faces outward when assembled as a wall panel or floor panel; and the upper surface of the antistatic bamboo-plastic composite board is attached to the wall or floor surface.

[0037] In different embodiments, in order to improve the decoration performance of the antistatic bamboo-plastic composite board, a decorative layer can also be formed on the upper surface of the antistatic bamboo-plastic composite board, and the decorative layer should preferably be a sticker layer or a UV coating layer.

[0038] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An antistatic bamboo-plastic composite board, characterized in that, The application relates to a substrate. The substrate is a bamboo-plastic composite board, the substrate has a first flat surface, a center blind groove is formed in the middle of the second surface of the board body, a plurality of annular blind grooves are concentrically arranged on the outer edge of the center blind groove, and a communication part is formed between the annular blind grooves and between the innermost annular blind groove and the center blind groove. A metal ring matched with the size of the annular blind groove is embedded in the annular blind groove, a metal ring matched with the outer contour of the center blind groove is embedded on the outer edge of the center blind groove, the metal rings are connected through a conductor at the communication part position, and a grounding pin is connected to the outermost metal ring. A leveling layer is lined on the inner side of the center blind groove, 2-5 layers of heavy bamboo sheets are laminated and pressed on the surface of the leveling layer, the heavy bamboo sheets and the leveling layer are fixedly connected through a resin bonding layer, and a conductive metal mesh surface is formed in the corresponding resin bonding layer, and the outer side of the conductive metal mesh surface is pulled and fixed on the inner metal ring. The heavy bamboo sheets and the inner metal ring are flush with the second surface of the substrate, and the outer metal ring is flush with or slightly protrudes from the second surface. The heavy bamboo sheets are obtained by the following method: After the bamboo is dried to a water content of less than 15-18%, the bamboo is crushed into bamboo bundles, then the bamboo bundles are continuously dried to a water content of less than 10%, and then the bamboo bundles are subjected to alkali treatment, silane coupling agent treatment and glue dipping treatment in sequence, and then the heavy bamboo sheets are obtained after high-temperature and high-pressure heat curing treatment, and the bamboo fiber content of the heavy bamboo sheets is 45-52%. An assembly part for fixing and assembling the conductive metal mesh surface is formed on the surface of the inner metal ring, a plurality of through hole groups consistent with the number of the conductive metal mesh surfaces are arranged on the assembly part in the height direction, each through hole group comprises a plurality of through holes arranged in a ring shape, and the conductive metal mesh surfaces are arranged on the through holes to complete the assembly.

2. The antistatic bamboo-plastic composite board according to claim 1, characterized in that, The depth of the annular blind groove is 1 / 3-2 / 3 of the thickness of the substrate, and the area of the center blind groove is 1 / 9-1 / 8 of the cross-sectional area of the substrate, and the depth of the center blind groove is 2-5 mm shallower than that of the annular blind groove.

3. The antistatic bamboo-plastic composite board according to claim 1, characterized in that, The outer metal ring and the inner metal ring are one of aluminum rings, copper rings, copper alloy rings and aluminum alloy rings, and the outer metal ring is a thin-walled metal ring with a wall thickness of 2-5 mm.

4. The antistatic bamboo-plastic composite board according to claim 1, characterized in that, The leveling layer is a polyurethane resin layer doped with glass fibers.

5. The antistatic bamboo-plastic composite board according to claim 1, characterized in that, A decorative layer is further formed on the first surface.

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