A kind of FRP reinforced wood plastic plank board and preparation method thereof

Abstract

The present invention discloses an FRP reinforced wood-plastic plank board, comprising a wood-plastic board installed on the top of a support beam by fasteners, a groove is provided at the bottom of the wood-plastic board, the groove is bidirectional through-type, unidirectional through-type or unidirectional non-through-type, FRP reinforcing ribs and a grid plate are embedded in the groove, and an adhesive layer is coated on the inner wall of the groove. The present invention embeds the FRP reinforcing material in the tensile area of ​​the wood-plastic board through mechanical bite and bonding, greatly improves the bearing capacity of the plank board through the constraint effect and synergistic force, reduces the influence of long-term creep, and solves the technical problems such as insufficient bearing capacity of the wood-plastic plank board and excessive deformation of the wood-plastic board caused by changes in the environment and load cycle during use.

Description

Technical Field

[0001] The invention relates to an FRP reinforced wood-plastic plank board and a preparation method thereof, belonging to the technical field of garden engineering and civil transportation engineering. Background Art

[0002] Currently, wooden plank boards used both domestically and internationally suffer from drawbacks such as flammability, susceptibility to moths, mildew, rot, deformation, poor durability, and a short service life, hindering their widespread adoption. Wood-plastic composites (WPCs), a new bio-based composite material that has recently gained popularity, utilize waste plant fibers (wood, rice straw) and waste plastics as their primary raw materials. They offer excellent wear resistance, dimensional stability, and weather resistance. In recent years, they have been increasingly adopted in landscape architecture, civil engineering, and transportation infrastructure. Their color and texture resemble those of wood, blending seamlessly into the natural environment.

[0003] However, WPC boardwalks are subject to significant creep and flexural deformation during use in complex natural environments, subject to fluctuating temperatures and humidity, as well as repeated loads. Existing research indicates that reinforcing them with lightweight, high-strength fiber-reinforced plastics (FRP) can offset the mechanical deficiencies of traditional WPCs. Due to the difference in thermal expansion coefficients between WPC and FRP reinforcements, drastic changes in the environment and loads can lead to interfacial delamination, which can affect the boardwalk's performance.

[0004] Therefore, how to effectively combine FRP reinforced materials and traditional wood-plastic composite materials to improve the deformation resistance and ultimate bearing capacity of traditional wood-plastic boards is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] Purpose of the invention: In view of the problems and shortcomings in the prior art, as well as the problem of interfacial delamination and damage that easily occurs when FRP material is used for reinforcement due to the difference in thermal expansion coefficients between the two, the present invention provides an FRP-reinforced wood-plastic plank board with small creep deformation and strong bearing capacity.

[0006] Technical solution: An FRP reinforced wood-plastic plank board, comprising a wood-plastic board installed above a support beam by fasteners, characterized in that a groove is provided at the bottom of the wood-plastic board, the groove being a two-way through type, a one-way through type or a one-way non-through type, an FRP reinforced grating plate is embedded in the groove, and an adhesive layer is coated on the inner wall of the groove.

[0007] The technical solution further defined in the present invention is that the two-way through grooves are a group of grid grooves staggered at equal intervals in the longitudinal and transverse directions along the bottom of the wood-plastic board, and the grooves are embedded with FRP reinforced grid plates.

[0008] Furthermore, the one-way through grooves are a group of horizontal grooves opened at equal intervals along the length direction of the bottom of the wood-plastic board, and the horizontal grooves are embedded with FRP reinforced grid plates.

[0009] Furthermore, the one-way non-through groove is a group of parallel grooves opened at equal intervals along the length direction of the bottom of the wood-plastic board, and tenon holes are respectively opened on the wood-plastic board at both ends of the parallel grooves. FRP reinforced grid plates are embedded in the parallel grooves, and the two ends of the FRP reinforced grid plates are embedded in the tenon holes.

[0010] Furthermore, the mortise hole is coated with adhesive.

[0011] Furthermore, the upper surface of the wood-plastic board is provided with anti-slip grooves.

[0012] Furthermore, one of the two side surfaces along the length direction of the wood-plastic board is provided with a through-length tenon, and the other side is provided with a through-length tenon groove.

[0013] Furthermore, a group of end tenons are provided on at least one side surface along the width direction of the wood-plastic board, and a tenon groove adapted to the end tenons is provided between two adjacent end tenons.

[0014] Furthermore, the FRP reinforced grid plate is formed by curing fibers and resin through a molding process.

[0015] Furthermore, the fiber is carbon fiber, glass fiber, basalt fiber, aramid fiber or mixed fiber containing steel wire, and the resin is unsaturated polyester, vinyl resin, epoxy resin or phenolic resin.

[0016] Furthermore, the adhesive is epoxy resin, phenolic resin, unsaturated polyester resin or vinyl resin.

[0017] The present invention also discloses a method for preparing an FRP reinforced wood-plastic plank board, which is characterized by comprising the following steps:

[0018] The first step is to put the wood plastic pellets into the extruder, and the extruder is molded according to the anti-slip layer design to prepare the required wood plastic board;

[0019] Step 2: Prepare a matching steel mold according to the required FRP reinforced grating plate;

[0020] The third step is to add resin material into the gap of the steel mold and evenly wind mutually orthogonal fiber bundles in the gap of the steel mold through fiber winding technology;

[0021] Step 4: The fibers soaked in the resin in step 3 are solidified and formed by a molding process, and the desired FRP reinforced grid plate is obtained after demoulding;

[0022] Step 5: Locate the position of the groove at the bottom of the wood-plastic board, use a cutting machine to cut the groove at the location, or use a mold to prepare the groove when co-extruding the wood-plastic board. If it is a one-way non-through type, make mortise holes at both ends of the groove;

[0023] Step 6: Apply resin adhesive to the grooves and tenon holes, and embed the prepared FRP reinforced grating into the grooves;

[0024] Step 7: After the adhesive layer resin is solidified and formed, the FRP reinforced wood-plastic plank board can be used.

[0025] Beneficial effects: Compared with the prior art, the FRP reinforced wood-plastic plank board provided by the present invention has the following advantages over ordinary wood-plastic plank boards:

[0026] 1) The present invention embeds the FRP reinforced grid plate in the tensile area of ​​the wood-plastic board through mechanical interlocking and bonding. Through the constraint effect and synergistic force, the load-bearing capacity of the plank board is greatly improved, the influence of long-term creep is reduced, and the technical problems of insufficient load-bearing capacity of the wood-plastic board and excessive deformation of the wood-plastic board caused by changes in the environment and load cycles during use are solved.

[0027] 2) The plank board structure of the present invention can not only improve the mechanical properties of the wood-plastic plank board but also significantly reduce the phenomenon of interface peeling between the wood-plastic and FRP reinforced grid boards caused by drastic environmental changes, thereby extending the service life of the plank board.

[0028] 3) The FRP reinforced wood-plastic plank board of the present invention is easy to install and convenient to construct on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a three-dimensional structural diagram of Example 1 of the present invention;

[0030] Figure 2 This is a second viewing angle view of Example 1 of the present invention;

[0031] Figure 3 A partially enlarged view from a third viewing angle of Example 1 of the present invention;

[0032] Figure 4 This is a cross-sectional view of the structure of Example 1 of the present invention;

[0033] Figure 5 This is a schematic diagram of the installation of the wood-plastic board in Example 1 of the present invention;

[0034] Figure 6 Schematic diagram of the three-dimensional structure of embodiment 2 of the present invention;

[0035] Figure 7 This is a structural cross-sectional view of Example 3 of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1-5 As shown, this embodiment provides an FRP-reinforced wood-plastic plank board, including a plank board 1 installed above a wood-plastic beam 9 via self-tapping screws 10. The bottom of the plank board 1 is provided with bidirectional through-type grid grooves 6 arranged at equal intervals in the vertical and horizontal directions. FRP-reinforced grid plates 7 are embedded in the grooves, and the inner walls of the grooves are coated with an adhesive layer.

[0038] Preferably, anti-slip grooves 2 are provided on the upper surface of the plank board.

[0039] Preferably, one of the two side surfaces along the length direction of the plank board is provided with a full-length tenon 4, and the other side is provided with a full-length tenon groove 3. When assembling and splicing, the full-length tenon of the rear plank board is embedded in the full-length tenon groove 3 of the front plank board.

[0040] Preferably, the end tenon is co-extruded during the production of the wood-plastic board. The end tenon is wedge-shaped, and the FRP reinforced grid plate at the bottom of the wood-plastic board extends into the tenon to improve the shear resistance of the tenon.

[0041] Preferably, the full-length mortise and tenon is coated with adhesive.

[0042] Preferably, the plank board 1 is made of wood-plastic granules, PVC resin, poplar wood powder, calcium carbonate filler, etc. through spiral co-extrusion.

[0043] Preferably, the anti-slip grooves 2 are provided on the upper surface of the plank road plate 1 and are extruded together with the plank road plate 1 at one time.

[0044] Preferably, the full-length mortise and tenon groove 3 is provided on one longitudinal side of the plank board 1, and the full-length tenon 4 is provided on the other longitudinal side of the wood-plastic board. The full-length mortise and tenon groove is co-extruded during the production of the wood-plastic board. The cross-section of the full-length mortise and tenon groove is wedge-shaped with rounded corners.

[0045] Preferably, the end tenons 5 are located on one or both sides of the width of the plank board 1, with a mortise groove between adjacent end tenons. During splicing, the end tenon of the subsequent plank board fits into the mortise groove of the preceding plank board. The full-length tenon is co-extruded during the production of the wood-plastic board. Its cross-section is a wedge-shaped shape consistent with the full-length groove, with rounded corners.

[0046] Preferably, the bidirectional through-type grille groove 6 is provided at the bottom of the plank board 1 and can be formed at one time when co-extruded with the wood-plastic board, or can be excavated on the wood-plastic board at a later stage.

[0047] Preferably, the adhesive is a resin glue, which can be epoxy resin, phenolic resin, unsaturated polyester resin or vinyl resin, etc., and is coated on the inner surface of the groove.

[0048] Preferably, the FRP reinforced grating 7 is formed by curing a thermosetting resin (epoxy resin, phenolic resin, unsaturated polyester resin, or vinyl resin) with a fiber material (carbon fiber, glass fiber, basalt fiber, aramid fiber, or a mixed fiber containing steel wire) through a molding process. After being coated with adhesive, it is embedded in the bidirectional through-grooves. Once the resin adhesive cures, the desired plank board 1 is obtained. Example

[0049] like Figure 6 This embodiment has the same basic structure as Example 1, differing in that the grooves in this embodiment are unidirectional, not longitudinally through but transversely through, with an FRP reinforced grating embedded within. The self-tapping screws in this embodiment can be selected in varying lengths depending on the thickness of the wood-plastic board. They are simple to operate, easy to install, and provide a secure connection. The holes should be drilled away from the FRP reinforced grating at the bottom of the wood-plastic board. Example

[0050] like Figure 7 This embodiment has the same basic structure as Example 1, differing in that the grooves are unidirectional, non-through, and are a set of parallel grooves spaced evenly along the length of the wood-plastic board's bottom. Tenon holes 8 are provided in the wood-plastic board at each end of the parallel grooves. FRP reinforced grating panels are embedded in the parallel grooves, with the ends of the FRP reinforced grating panels nestled in the tenon holes. The FRP reinforced grating panels are made of FRP reinforcement. The depth, width, and spacing of the grooves, as well as the diameter and depth of the tenon holes, can be designed as desired.

[0051] The FRP reinforced wood-plastic plank board is placed on the wood-plastic beam 9 at the bottom, and the plank board 1 and the wood-plastic beam 9 are tightly linked together with self-tapping screws 10.

[0052] The preparation method of the FRP reinforced wood-plastic plank board of this embodiment is as follows:

[0053] a. Prepare the raw materials required for wood-plastic board according to the ratio of PVC base, poplar powder, calcium carbonate filler, etc., and mix them evenly through twin-screw or single-screw extrusion to granulate, thereby obtaining wood-plastic pellets;

[0054] b. The wood-plastic pellets are placed into an extruder, which is molded according to the design of the anti-slip layer to prepare the desired wood-plastic board;

[0055] c. Prepare a matching steel mold according to the required FRP reinforced grating specifications;

[0056] d. Adding resin such as unsaturated polyester, vinyl resin, epoxy resin or phenolic resin into the gap of the steel mold and evenly winding mutually orthogonal fiber bundles in the gap of the steel mold through fiber winding technology;

[0057] e by molding process d soaked in resin fiber curing molding, after demoulding to obtain the desired FRP reinforced grid plate;

[0058] f. Locate the groove at the bottom of the wood-plastic board, use a cutting machine to cut the groove at the location, or make a mold to prepare the groove when co-extruding the wood-plastic board, and make holes in the end-reinforced tenon-type;

[0059] g in the groove and tenon coated with a resin adhesive, and the prepared FRP reinforced grid plate embedded in the groove;

[0060] h. After the adhesive layer resin is solidified and formed, the FRP reinforced wood-plastic plank board can be used.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing an FRP-reinforced wood-plastic plank board, the FRP-reinforced wood-plastic plank board comprising a wood-plastic board installed on a support beam by fasteners, a groove is provided at the bottom of the wood-plastic board, the groove is a two-way through type, an FRP-reinforced grid plate is embedded in the groove, and an adhesive layer is coated on the inner wall of the groove, characterized in that: It includes the following steps: The first step is to put the wood plastic pellets into the extruder, and the extruder is molded according to the anti-slip layer design to prepare the required wood plastic board; Step 2: Prepare a matching steel mold according to the required FRP reinforced grating plate; The third step is to add resin material into the gap of the steel mold and evenly wind mutually orthogonal fiber bundles in the gap of the steel mold through fiber winding technology; Step 4: solidify and shape the fibers soaked in the resin in the step 3 by a molding process, and obtain the desired FRP reinforced grid plate after demoulding; Step 5: Locate the groove at the bottom of the wood-plastic board, and use a cutting machine to make grooves at the location or use a mold to prepare the groove when co-extruding the wood-plastic board; Step 6: Apply resin adhesive in the groove and embed the prepared FRP reinforced grid plate into the groove; Step 7: After the adhesive layer resin is solidified and formed, the FRP reinforced wood-plastic plank board can be obtained.

2. The method for preparing the FRP reinforced wood-plastic plank board according to claim 1, characterized in that: The two-way through grooves are a group of grid grooves staggered and opened at equal intervals in the longitudinal and transverse directions along the bottom of the wood-plastic board, and the grooves are embedded with FRP reinforced grid plates.

3. The method for preparing the FRP reinforced wood-plastic plank board according to claim 2, characterized in that: One of the two side surfaces along the length direction of the wood-plastic board is provided with a through-length tenon, and the other side is provided with a through-length tenon groove.

4. The method for preparing the FRP reinforced wood-plastic plank board according to claim 2, characterized in that: A group of end tenons are arranged on at least one side along the width direction of the wood-plastic board, and a tenon groove matched with the end tenons is arranged between two adjacent end tenons.

5. The method for preparing the FRP reinforced wood-plastic plank board according to claim 2, characterized in that: The fiber is carbon fiber, glass fiber, basalt fiber, aramid fiber or mixed fiber containing steel wire, and the resin is unsaturated polyester, vinyl resin, epoxy resin or phenolic resin.

6. The method for preparing the FRP reinforced wood-plastic plank board according to claim 2, characterized in that: The adhesive is epoxy resin, phenolic resin, unsaturated polyester resin or vinyl resin.

Images