Load-bearing reinforced composite drainage board

Abstract

The present application provides a kind of load-bearing reinforced composite drainage plate, including two resin base layers and the composite resin layer being arranged between two the resin base layers, the composite resin layer includes maleic anhydride grafting polyethylene resin 20-25 parts, lignin modified polypropylene resin 30-35 parts, plasticizer 5-6 parts, dispersing agent 2-4 parts, silane coupling agent 1-2 parts.Maleic anhydride grafting polyethylene resin maleic anhydride group is easy to hydrolyze ring-opening to form carboxyl group, carboxyl group can react with the hydroxyl group of lignin component in lignin modified polypropylene to form chemical crosslinking point, crosslinking point limits the free movement of molecular chain when under pressure, improves the anti creep and compression strength of material, the addition of lignin can improve flexural modulus and compression strength;Maleic anhydride grafting polyethylene resin polyethylene segment and polypropylene are combined by co-crystallization or segment winding.Resin base layer as rigid shell, resist overall bending and compression, protect the interior, composite resin layer bears main tensile and compression load.

Description

Technical Field

[0001] This invention relates to the field of drainage board technology, and in particular to a load-bearing reinforced composite drainage board. Background Technology

[0002] Drainage boards are made from resins such as polyethylene (PE), polyvinyl chloride (PVC), and polypropylene (PP) as the matrix, with the addition of fillers such as calcium carbonate and talc to prepare composite resin granules. These granules are then processed into plastic base plates through extrusion molding. The boards are then stamped to create conical protrusions or reinforcing ribs (or hollow, porous cylindrical shapes). The grooves between these protrusions form drainage channels. Through continuous innovation and research, the raw materials have been significantly improved and modified, resulting in substantial increases in compressive strength and overall flatness. Widths range from 1 to 3 meters, and lengths from 4 to 10 meters or more.

[0003] Existing resin-based drainage boards face the challenge of achieving both high compressive and tensile strength simultaneously. This is because the mechanical properties of a single resin matrix (such as polyethylene or polypropylene) exhibit significant directionality. For example, extruded boards have high compressive strength in the longitudinal direction (extrusion direction) but low tensile strength in the transverse direction, resulting in a significant difference between the two. Furthermore, resins such as polyester and vinyl ester have high shrinkage rates during curing, which easily generate residual stress within the material, leading to a trade-off between compressive and tensile strength. Summary of the Invention

[0004] One of the objectives of this invention is to provide a load-bearing reinforced composite drainage board, comprising two resin base layers and a composite resin layer disposed between the two resin base layers. The composite resin layer comprises 20-25 parts of maleic anhydride-grafted polyethylene resin, 30-35 parts of lignin-modified polypropylene resin, 5-6 parts of plasticizer, 2-4 parts of dispersant, and 1-2 parts of silane coupling agent.

[0005] Preferably, the maleic anhydride-grafted polyethylene resin is prepared by the following steps: 100 parts of polyethylene, 1.5-3 parts of maleic anhydride, 1-2 parts of styrene and 0.1-0.2 parts of dicumyl peroxide are thoroughly mixed to obtain a mixture; the mixture is fed into an extruder for melt extrusion and then cooled.

[0006] Preferably, the process involves melt extrusion at a temperature of 160-220°C.

[0007] Preferably, the lignin-modified polypropylene resin is prepared by the following steps: 3-5 parts of lignin are mixed with 10-20 parts of polypropylene resin and 0.3-0.5 parts of coupling agent, and the mixed raw material is extruded and granulated using a twin-screw extruder.

[0008] Preferably, the process involves melt extrusion at a temperature of 170-200°C.

[0009] Preferably, the composite resin layer further includes 5-15 parts of glass fiber. The glass fiber acts as a high-strength skeleton, bearing the main load and improving the tensile strength of the material.

[0010] Preferably, the glass fiber is a glass fiber treated with a coupling agent, prepared by the following steps: immersing the glass fiber in a coupling agent solution for 10-30 minutes, drying it in an oven at 100-120℃ for 15-30 minutes; the coupling agent solution comprises 90-95 parts anhydrous ethanol, 5-10 parts deionized water, and 0.5-1.0 parts silane coupling agent, with a pH of 4.5-5.5. Under weakly acidic conditions, the silane coupling agent (such as KH550) hydrolyzes to generate silanol groups, which condense with the hydroxyl groups on the glass fiber surface to form covalent bonds; the active functional group (such as amino group) at the other end of the coupling agent can react with the anhydride groups of maleic anhydride-grafted polyethylene resin to form a complete chemical bond chain of "glass fiber-coupling agent-resin matrix".

[0011] Preferably, the plasticizer is polyethylene glycol and the dispersant is calcium stearate or zinc stearate.

[0012] Preferably, the resin base layer comprises the following components: 30-40 parts of high-density polyethylene, 5-15 parts of chlorinated polypropylene, 2-5 parts of nano-calcium carbonate, 0.1-1 parts of antioxidant, and 0.1-0.5 parts of UV stabilizer.

[0013] Preferably, the antioxidant is selected from antioxidant 1010 or antioxidant 168; the UV protectant is UV protectant UV-531 or UV protectant UV-328.

[0014] This invention has the following beneficial effects: the maleic anhydride-grafted polyethylene resin's maleic anhydride groups readily hydrolyze and open rings to generate carboxyl groups. These carboxyl groups can react with the hydroxyl groups (including phenolic and alcoholic hydroxyl groups) of the lignin component in the lignin-modified polypropylene to form chemical crosslinking points. These crosslinking points restrict the free movement of molecular chains under pressure, improving the material's creep resistance and compressive strength. Furthermore, the addition of lignin can improve the flexural modulus and compressive strength. Moreover, the polyethylene segments of the maleic anhydride-grafted polyethylene resin are bonded to the polypropylene through co-crystallization or segment entanglement. The resin base layer acts as a rigid outer shell, resisting overall bending and compression, protecting the interior. The composite resin layer bears the main tensile and compressive loads. Furthermore, the polar groups of the chlorinated polypropylene in the resin base layer and the anhydride groups of the maleic anhydride-grafted polyethylene in the composite resin layer can form hydrogen bonds, further enhancing the bonding strength between the three layers.

[0015] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description. Detailed Implementation

[0016] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] The load-bearing reinforced composite drainage board of the present invention will be further described below with reference to embodiments. The raw materials used in the embodiments of the present invention are all commercially available industrial-grade products.

[0018] Among them, polyethylene is selected from HSGC7260 or 6095 grade produced by Guangdong Petrochemical Jieyang Branch. The polypropylene selected is Sinopec Zhenhai Refining & Chemical V30G; Alkali lignin was purchased from Meite (Hubei) New Materials Co., Ltd. (CAS: 8068-05-1). Silane coupling agent KH550 was purchased from Nanjing Qizheng Chemical Co., Ltd. The chlorinated polypropylene selected is Colorchem's CK-300 grade; Nano-calcium carbonate was purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd. (particle size 40-80nm). Antioxidant 1010 is selected from BASF's Irganox 1010; All other reagents are commercially available analytical grade or industrial grade products.

[0019] Example 1

[0020] The load-bearing reinforced composite drainage board of this embodiment includes two resin base layers and a composite resin layer disposed between the two resin base layers. It is prepared through the following steps: resin base layer granules and composite resin layer granules are prepared separately and added to the three hoppers of a three-layer co-extrusion extruder. Through a three-layer co-extrusion die, the composite resin layer is positioned between the two resin base layers, forming a three-layer composite structure. The structure is then shaped, cooled, drawn, and cut using a three-roll calender to obtain the load-bearing reinforced composite drainage board. Product specifications: Total thickness 5mm, with the upper and lower resin base layers each 1.5mm and the middle composite resin layer 2mm.

[0021] The preparation of composite resin layer granules includes: first preparing 20 parts of maleic anhydride grafted polyethylene resin, 30 parts of lignin modified polypropylene resin, 5 parts of polyethylene glycol, 2 parts of calcium stearate, and 1 part of silane coupling agent KH550, and thoroughly mixing the above mixture; then feeding the mixture into an extruder and performing melt extrusion at a temperature of 160°C, followed by cooling. The maleic anhydride-grafted polyethylene resin is prepared by the following steps: 100 parts of polyethylene, 2.5 parts of maleic anhydride, 1.5 parts of styrene, and 0.15 parts of dicumyl peroxide are weighed; the above raw materials are added to a high-speed mixer and mixed at 800 rpm for 5 minutes at room temperature to obtain a mixture; the mixture is fed into a twin-screw extruder for extrusion to obtain maleic anhydride-grafted polyethylene resin. The lignin-modified polypropylene resin is prepared through the following steps: Weigh 4 parts of alkali lignin, 15 parts of polypropylene resin (homopolymer PP, MFR=10g / 10min), and 0.4 parts of silane coupling agent KH550: Mix the lignin and silane coupling agent KH550 in a high-speed mixer, then add the polypropylene resin mixing bowl, and feed the mixture into a twin-screw extruder for extrusion granulation to obtain lignin-modified polypropylene resin.

[0022] The resin base layer is prepared by the following steps: 32 parts of high-density polyethylene, 12 parts of chlorinated polypropylene, 3 parts of nano calcium carbonate, 0.8 parts of antioxidant 1010, and 0.2 parts of UV stabilizer UV-328 are fed into a twin-screw extruder for extrusion granulation.

[0023] Example 2

[0024] The load-bearing reinforced composite drainage board in this embodiment has the same product specifications as in Embodiment 1.

[0025] The preparation of composite resin layer granules includes: first preparing 25 parts of maleic anhydride grafted polyethylene resin, 35 parts of lignin modified polypropylene resin, 6 parts of polyethylene glycol, 4 parts of dispersant, and 2 parts of silane coupling agent KH550, and thoroughly mixing the above mixture; then feeding the mixture into an extruder and performing melt extrusion at a temperature of 220°C, followed by cooling. The maleic anhydride-grafted polyethylene resin is prepared by the following steps: 100 parts of polyethylene, 1.5 parts of maleic anhydride, 1 part of styrene, and 0.1 parts of dicumyl peroxide are weighed; the above raw materials are added to a high-speed mixer and mixed at 800 rpm for 5 minutes at room temperature to obtain a mixture; the mixture is fed into a twin-screw extruder for extrusion to obtain maleic anhydride-grafted polyethylene resin. The lignin-modified polypropylene resin is prepared through the following steps: Weigh out 3 parts of alkali lignin, 10 parts of polypropylene resin (homopolymer PP, MFR=10g / 10min), and 0.3 parts of silane coupling agent KH550: Mix the lignin and silane coupling agent KH550 in a high-speed mixer, then add the polypropylene resin mixing bowl, and feed the mixture into a twin-screw extruder for extrusion granulation to obtain lignin-modified polypropylene resin.

[0026] The resin base layer is prepared by the following steps: 30 parts of high-density polyethylene, 5 parts of chlorinated polypropylene, 2 parts of nano calcium carbonate, 0.1 parts of antioxidant 1010, and 0.1 parts of UV stabilizer UV328 are fed into a twin-screw extruder for granulation.

[0027] Example 3

[0028] The load-bearing reinforced composite drainage board in this embodiment has the same product specifications as in Embodiment 1.

[0029] The preparation of composite resin layer granules includes: first preparing 20-25 parts of maleic anhydride grafted polyethylene resin, 32 parts of lignin-modified polypropylene resin, 5.2 parts of polyethylene glycol, 3 parts of dispersant, and 1.8 parts of silane coupling agent KH550, and thoroughly mixing the above mixture; then feeding the mixture into an extruder and performing melt extrusion at 210°C, followed by cooling; The maleic anhydride-grafted polyethylene resin is prepared by the following steps: 100 parts of polyethylene, 3 parts of maleic anhydride, 2 parts of styrene, and 0.2 parts of dicumyl peroxide are weighed; the above raw materials are added to a high-speed mixer and mixed at 800 rpm for 5 minutes at room temperature to obtain a mixture; the mixture is fed into a twin-screw extruder for extrusion to obtain maleic anhydride-grafted polyethylene resin. The lignin-modified polypropylene resin is prepared through the following steps: Weigh out 5 parts of alkali lignin, 20 parts of polypropylene resin (homopolymer PP, MFR=10g / 10min), and 0.5 parts of silane coupling agent KH550: Mix the lignin and silane coupling agent KH550 in a high-speed mixer, then add the polypropylene resin mixing bowl, and feed the mixture into a twin-screw extruder for extrusion granulation to obtain lignin-modified polypropylene resin.

[0030] The resin base layer is prepared by the following steps: 40 parts of high-density polyethylene, 15 parts of chlorinated polypropylene, 5 parts of nano calcium carbonate, 1 part of antioxidant 1010, and 0.5 parts of UV stabilizer UV328 are fed into a twin-screw extruder for extrusion granulation.

[0031] Example 4

[0032] The load-bearing reinforced composite drainage board in this embodiment has the same product specifications as in Embodiment 1.

[0033] The preparation of the composite resin layer granules includes: first, preparing 20 parts of maleic anhydride-grafted polyethylene resin, 30 parts of lignin-modified polypropylene resin, 5 parts of polyethylene glycol, 2 parts of dispersant, 1 part of silane coupling agent KH550, and 5 parts of glass fiber, and thoroughly mixing the above mixture; feeding the mixture into an extruder, performing melt extrusion at 220°C, and cooling. Other steps are the same as in Example 1.

[0034] Example 5

[0035] The load-bearing reinforced composite drainage board in this embodiment has the same product specifications as in Embodiment 1.

[0036] The preparation of the composite resin layer granules includes: first, preparing 20 parts of maleic anhydride-grafted polyethylene resin, 30 parts of lignin-modified polypropylene resin, 5 parts of polyethylene glycol, 2 parts of dispersant, 1 part of silane coupling agent KH550, and 15 parts of glass fiber, and thoroughly mixing the above mixture; feeding the mixture into an extruder, performing melt extrusion at 220°C, and cooling. Other steps are the same as in Example 1.

[0037] Example 6

[0038] The load-bearing reinforced composite drainage board in this embodiment has the same product specifications as in Embodiment 1.

[0039] The preparation of the composite resin layer granules includes: first, preparing 20 parts of maleic anhydride-grafted polyethylene resin, 30 parts of lignin-modified polypropylene resin, 5 parts of polyethylene glycol, 2 parts of calcium stearate, 1 part of silane coupling agent KH550, and 8 parts of glass fiber, and thoroughly mixing the above mixture; feeding the mixture into an extruder, performing melt extrusion at 220°C, and cooling. The glass fiber is prepared by the following steps: immersing the glass fiber in the coupling agent solution for 10 minutes, drying it, and then drying it in an oven at 100°C for 15 minutes; the coupling agent solution includes 90 parts of anhydrous ethanol, 5 parts of deionized water, and 0.5 parts of silane coupling agent, with a pH value of 4.8. Other steps are the same as in Example 1.

[0040] Example 7

[0041] The load-bearing reinforced composite drainage board in this embodiment has the same product specifications as in Embodiment 1.

[0042] The preparation of the composite resin layer granules includes: first, preparing 20 parts of maleic anhydride-grafted polyethylene resin, 30 parts of lignin-modified polypropylene resin, 5 parts of polyethylene glycol, 2 parts of calcium stearate, 1 part of silane coupling agent KH550, and 8 parts of glass fiber, and thoroughly mixing the above mixture; feeding the mixture into an extruder, performing melt extrusion at 220°C, and cooling. The glass fiber is prepared by the following steps: immersing the glass fiber in a coupling agent solution for 30 minutes, drying it, and then drying it in an oven at 120°C for 30 minutes; the coupling agent solution includes 95 parts of anhydrous ethanol, 10 parts of deionized water, and 1.0 part of silane coupling agent KH550, with a pH value of 4.5. Other steps are the same as in Example 1.

[0043] Comparative Example This comparative example of a load-bearing reinforced composite drainage board includes three resin base layers. A composite resin layer is positioned between two resin base layers using a three-layer co-extrusion die, forming a three-layer composite structure. The board is then shaped, cooled, stretched, and cut using a three-roll calender to obtain the load-bearing reinforced composite drainage board. Product specifications: Total thickness 5mm, with the top and bottom resin base layers each 1.5mm and the middle composite resin layer 2mm.

[0044] The resin base layer is prepared by the following steps: 32 parts of high-density polyethylene, 10 parts of chlorinated polypropylene, 3 parts of nano calcium carbonate, 2 parts of antioxidant 1010, and 4 parts of UV stabilizer UV328 are fed into a twin-screw extruder for extrusion granulation.

[0045] Performance testing The drainage boards prepared in Examples 1-5 and Comparative Example 1 were subjected to performance tests. Their tensile strength (using GB / T1040.2, tensile speed 50 mm / min) and compressive strength (using QCR562.3-2008) were tested. The test results are shown in Table 1.

[0046] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A load-bearing reinforced composite drainage board, characterized in that, It includes two resin base layers and a composite resin layer disposed between the two resin base layers. The composite resin layer includes 20-25 parts of maleic anhydride-grafted polyethylene resin, 30-35 parts of lignin-modified polypropylene resin, 5-6 parts of plasticizer, 2-4 parts of dispersant, and 1-2 parts of silane coupling agent. Maleic anhydride-grafted polyethylene resin is prepared by the following steps: 100 parts of polyethylene, 1.5-3 parts of maleic anhydride, 1-2 parts of styrene and 0.1-0.2 parts of dicumyl peroxide are thoroughly mixed to obtain a mixture; the mixture is fed into an extruder for melt extrusion and then cooled. The lignin-modified polypropylene resin is prepared by the following steps: 3-5 parts of lignin are mixed with 10-20 parts of polypropylene resin and 0.3-0.5 parts of coupling agent, and the mixed raw material is extruded and granulated using a twin-screw extruder. The resin base layer comprises the following components: 30-40 parts high-density polyethylene, 5-15 parts chlorinated polypropylene, 2-5 parts nano calcium carbonate, 0.1-1 parts antioxidant, and 0.1-0.5 parts UV stabilizer.

2. The load-bearing reinforced composite drainage board according to claim 1, characterized in that, Melt extrusion at 160-220℃.

3. The load-bearing reinforced composite drainage board according to claim 1, characterized in that, Melt extrusion at 170-200℃.

4. The load-bearing reinforced composite drainage board according to claim 1, characterized in that, The composite resin layer also includes 5-15 parts of glass fiber.

5. The load-bearing reinforced composite drainage board according to claim 4, characterized in that, The glass fiber is a glass fiber treated with a coupling agent, which is prepared by the following steps: immersing the glass fiber in a coupling agent solution for 10-30 minutes, drying it, and then drying it in an oven at 100-120℃ for 15-30 minutes; the coupling agent solution includes 90-95 parts anhydrous ethanol, 5-10 parts deionized water, and 0.5-1.0 parts silane coupling agent, and the pH value of the coupling agent solution is 4.5-5.

5.

6. The load-bearing reinforced composite drainage board according to claim 1, characterized in that, The plasticizer is polyethylene glycol, and the dispersant is calcium stearate and zinc stearate.

7. The load-bearing reinforced composite drainage board according to claim 1, characterized in that, The antioxidant is selected from antioxidant 1010 or antioxidant 168; the UV protectant is UV protectant UV-531 or UV protectant UV-328.

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