PE wood-plastic composite material and preparation method thereof

Abstract

The invention belongs to the technical field of wood-plastic plates, and particularly relates to a PE wood-plastic composite material and a preparation method thereof. The carbon beads are introduced into a PE wood-plastic formula system to replace traditional calcium powder / talcum powder, a lubricant, an antioxidant and other raw materials, and meanwhile, through the synergistic effect of HDPE and LDPE in different proportions, on one hand, the problem of precipitation caused by lubricating components is solved, on the other hand, various mechanical properties of the PE wood-plastic composite material are improved, and the service life of the PE wood-plastic composite material is prolonged. Wherein the minimum concentrated load can be increased to 30%, the linear expansion coefficient and the shrinkage rate can be reduced by 40%, the vicat softening point can reach 127 DEG C, and the technical problems that the PE wood-plastic composite material is large in precipitation amount and prone to deformation in application are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of wood-plastic boards, and particularly relates to a PE wood-plastic composite material and a preparation method thereof. Background Art

[0002] PE wood-plastic composite material is a new type of composite material, among which PE wood-plastic board has become one of the mainstream outdoor boards. Because of its advantages such as waterproof, moisture-proof and high environmental protection, it has gradually replaced traditional wood boards and is widely used outdoors.

[0003] Currently, PE wood-plastic composites are typically formed through granulation and melt extrusion using raw materials such as wood flour, PE particles, calcium carbonate / talc, compatibilizers, lubricants, and antioxidants. However, long-term outdoor use can lead to problems such as precipitation, cracking, shrinkage, expansion, and warping, which to some extent restrict the application of PE wood-plastic composites. Therefore, the development of a precipitation-free, deformation-resistant PE wood-plastic composite is urgently needed. Summary of the Invention

[0004] The object of the present invention is to provide a PE wood-plastic composite material and a preparation method thereof. The PE wood-plastic composite material provided by the present invention has no precipitation and is resistant to deformation.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a PE wood-plastic composite material, comprising the following components in parts by weight:

[0007] 50-60 parts of wood flour, 10-20 parts of high-density polyethylene, 5-10 parts of low-density polyethylene, 10-15 parts of carbon beads and 2-4 parts of maleic anhydride grafted polyethylene;

[0008] The carbon beads are prepared by: performing 3D printing using fly ash as a raw material to obtain spherical microbeads; and performing a pore-breaking treatment on the spherical microbeads to obtain the carbon beads.

[0009] The pore size of the carbon beads is 25-35%.

[0010] Preferably, the following components are included in parts by weight:

[0011] 50-55 parts of wood flour, 10-15 parts of high-density polyethylene, 5-8 parts of low-density polyethylene, 11-14 parts of carbon beads and 2-3 parts of maleic anhydride grafted polyethylene.

[0012] Preferably, the carbon beads include first carbon beads and second carbon beads;

[0013] The particle size of the first carbon beads is 900 mesh, and the particle size of the second carbon beads is 1200 mesh; the mass ratio of the first carbon beads to the second carbon beads is 4:6.

[0014] Preferably, the PE wood-plastic composite material further comprises a pigment.

[0015] Preferably, the pigment comprises carbon black;

[0016] Based on the weight of the wood powder, the weight of the pigment is 1 to 3 parts.

[0017] The present invention also provides a method for preparing the PE wood-plastic composite material described in the above technical solution, comprising the following steps:

[0018] After the components of the PE wood-plastic composite material are mixed, a first melt extrusion, granulation and a second melt extrusion are sequentially performed to obtain the PE wood-plastic composite material.

[0019] Preferably, the granulation condition parameters include: the temperature of barrel 1 is 50°C, the temperature of barrel 2 is 120°C, the temperature of barrel 3 is 195°C, the temperature of barrel 4 is 195°C, the temperature of barrel 5 is 195°C, the temperature of barrel 6 is 195°C, the temperature of barrel 7 is 120°C, and the temperature of barrel 8 is 60°C; the main engine speed is 430rpm, and the current is 185-195A.

[0020] Preferably, the condition parameters of the first melt extrusion and the second melt extrusion independently include: the temperature of barrel 1 is 180°C, the temperature of barrel 2 is 185°C, the temperature of barrel 3 is 130°C, the temperature of barrel 4 is 130°C, the temperature of confluence core is 140°C, the temperature of mold 1 is 150°C, the temperature of mold 2 is 150°C, the temperature of mold 3 is 150°C, and the temperature of mold 4 is 150°C; the main engine speed is 20rpm, and the current is 45-50A.

[0021] The present invention provides a PE wood-plastic composite material, comprising the following components in parts by weight: a PE wood-plastic composite material, comprising the following components in parts by weight: 50-60 parts of wood powder, 10-20 parts of high-density polyethylene, 5-10 parts of low-density polyethylene, 10-15 parts of carbon beads and 2-4 parts of maleic anhydride grafted polyethylene; a preparation method of the carbon beads comprises: performing 3D printing on fly ash as a raw material to obtain spherical microbeads; performing pore-breaking treatment on the spherical microbeads to obtain the carbon beads; the pore-breaking rate of the carbon beads is 25-35%. The present invention introduces carbon beads into the PE wood-plastic formula system to replace traditional raw materials such as calcium powder / talc powder, lubricants, and antioxidants. At the same time, through the synergistic effect of different proportions of HDPE and LDPE, on the one hand, it solves the precipitation problem caused by the lubricating component, and on the other hand, it improves the various mechanical properties of the PE wood-plastic composite material. Among them, the minimum concentrated load can be increased by 30%, the linear expansion coefficient and shrinkage rate can be reduced by 40%, and the Vicat softening point can reach 127°C, thus solving the technical problems of frequent precipitation and easy deformation of PE wood-plastic composite materials in application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A physical picture of the carbon beads provided by the present invention;

[0023] Figure 2 The SEM image of the carbon beads provided by the present invention;

[0024] Figure 3 This is the SEM image of the carbon beads provided by the present invention. DETAILED DESCRIPTION

[0025] The present invention provides a PE wood-plastic composite material, comprising the following components in parts by weight:

[0026] 50-60 parts of wood flour, 10-20 parts of high-density polyethylene, 5-10 parts of low-density polyethylene, 10-15 parts of carbon beads and 2-4 parts of maleic anhydride grafted polyethylene;

[0027] The carbon beads are prepared by: performing 3D printing using fly ash as a raw material to obtain spherical microbeads; and performing a pore-breaking treatment on the spherical microbeads to obtain the carbon beads.

[0028] The pore size of the carbon beads is 25-35%.

[0029] In the present invention, unless otherwise specified, all components are commercially available products well known to those skilled in the art.

[0030] In parts by weight, the PE wood-plastic composite material provided by the present invention comprises 50 to 60 parts of wood flour, preferably 50 to 55 parts, and more preferably 52 to 53 parts.

[0031] Based on the weight of the wood powder, the PE wood-plastic composite material provided by the present invention includes 10 to 20 parts of high-density polyethylene, preferably 10 to 15 parts, and more preferably 12 to 13 parts.

[0032] Based on the weight of the wood powder, the PE wood-plastic composite material provided by the present invention includes 5 to 10 parts of low-density polyethylene, preferably 5 to 8 parts, and more preferably 6 to 7 parts.

[0033] Based on the weight of the wood powder, the PE wood-plastic composite material provided by the present invention includes 10 to 15 parts of carbon beads, preferably 11 to 14 parts, and more preferably 12 to 13 parts. In the present invention, the method for preparing the carbon beads is: using fly ash as raw material for 3D printing to obtain spherical microbeads; performing pore-breaking treatment on the spherical microbeads to obtain the carbon beads. In the present invention, the pore-breaking rate of the carbon beads is 25 to 35%, preferably 30%. In the present invention, the carbon beads preferably include first carbon beads and second carbon beads; the particle size of the first carbon beads is preferably 900 mesh, and the particle size of the second carbon beads is preferably 1200 mesh; the mass ratio of the first carbon beads to the second carbon beads is preferably 4:6. In the present invention, the carbon beads are preferably purchased from Nanjing Sweisheng New Material Technology Co., Ltd. In the present invention, the actual picture of the carbon beads is as follows Figure 1 As shown in the scanning electron microscope image Figure 2 and Figure 3 shown.

[0034] Based on the weight of the wood powder, the PE wood-plastic composite material provided by the present invention includes 2 to 4 parts of maleic anhydride grafted polyethylene, preferably 2 to 3 parts.

[0035] The PE wood-plastic composite material provided by the present invention also preferably includes a pigment; the pigment preferably includes carbon black. In the present invention, based on the weight of the wood powder, the weight of the pigment is preferably 1 to 3 parts.

[0036] The present invention also provides a method for preparing the PE wood-plastic composite material described in the above technical solution, comprising the following steps:

[0037] After the components of the PE wood-plastic composite material are mixed, a first melt extrusion, granulation and a second melt extrusion are sequentially performed to obtain the PE wood-plastic composite material.

[0038] In the present invention, the granulation condition parameters preferably include: the temperature of barrel 1 is 50°C, the temperature of barrel 2 is 120°C, the temperature of barrel 3 is 195°C, the temperature of barrel 4 is 195°C, the temperature of barrel 5 is 195°C, the temperature of barrel 6 is 195°C, the temperature of barrel 7 is 120°C, and the temperature of barrel 8 is 60°C; the main engine speed is 430rpm, and the current is 185-195A.

[0039] In the present invention, the conditions and parameters of the first melt extrusion preferably include: the temperature of barrel 1 is 180°C, the temperature of barrel 2 is 185°C, the temperature of barrel 3 is 130°C, the temperature of barrel 4 is 130°C, the temperature of confluence core is 140°C, the temperature of die 1 is 150°C, the temperature of die 2 is 150°C, the temperature of die 3 is 150°C, and the temperature of die 4 is 150°C; the main engine speed is 20rpm, and the current is 45-50A.

[0040] In the present invention, the condition parameters of the second melt extrusion are consistent with the condition parameters of the first melt extrusion, and are not described in detail here.

[0041] In the present invention, the first melt extrusion, granulation and second melt extrusion are preferably all performed in a twin-screw extruder.

[0042] To further illustrate the present invention, a PE wood-plastic composite material and a preparation method thereof provided by the present invention are described in detail below with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of protection of the present invention.

[0043] In the following examples, the carbon beads were purchased from Nanjing Siweisheng New Material Technology Co., Ltd., the mass ratio of carbon beads with a particle size of 900 mesh to carbon beads with a particle size of 1200 mesh was 4:6, and the porosity was 30%.

[0044] Example 1

[0045] Materials: 60 parts of wood flour, 15 parts of high-density polyethylene, 10 parts of low-density polyethylene, 11 parts of carbon beads, 3 parts of maleic anhydride grafted polyethylene and 1 part of carbon black;

[0046] Preparation method: wood powder, high-density polyethylene, low-density polyethylene, carbon beads, maleic anhydride grafted polyethylene and carbon black are mixed evenly and then fed into a twin-screw extruder, and first melt extrusion, granulation and second melt extrusion are carried out in sequence to obtain the PE wood-plastic composite material, wherein the granulation process parameters are: cylinder 1: 50℃, cylinder 2: 120℃, cylinder 3: 195℃, cylinder 4: 195℃, cylinder 5: 195℃, cylinder 6: 195℃, cylinder 7: 120℃ ℃, barrel eight: 60℃, main engine speed: 430rpm, current controlled at 185~195A; the parameters of the first melt extrusion and the second melt extrusion are: barrel one: 180℃, barrel two: 185℃, barrel three: 130℃, barrel four: 130℃, confluence core: 140℃, die one: 150℃, die two: 150℃, die three: 150℃, die four: 150℃, main engine speed is 20rpm, and current is controlled at 45~50A.

[0047] Example 2

[0048] Materials: 55 parts of wood flour, 15 parts of high-density polyethylene, 10 parts of low-density polyethylene, 15 parts of carbon beads, 3 parts of maleic anhydride grafted polyethylene and 1 part of carbon black;

[0049] A PE wood-plastic composite material was prepared according to the preparation method of Example 1.

[0050] Comparative Example 1

[0051] Materials: 60 parts of wood flour, 25 parts of high-density polyethylene, 8 parts of calcium carbonate, 3 parts of maleic anhydride grafted polyethylene, 2.5 parts of lubricant, 0.5 parts of antioxidant, 1 part of pigment; the lubricant is polyethylene wax, the antioxidant is antioxidant 1010, and the pigment is carbon black;

[0052] A PE wood-plastic composite material was prepared according to the preparation method of Example 1.

[0053] Performance Testing

[0054] The performance tests of the PE wood-plastic composite materials obtained in Examples 1 to 2 and Comparative Example 1 were carried out, and the test results are shown in Table 1.

[0055] Table 1 Performance test results of PE wood-plastic composite materials obtained in Examples 1-2 and Comparative Example 1

[0056] Test standards Example 1 Example 2 Comparative Example 1 Minimum concentrated load / N GB / T24508-2020 3956 4513 3405 <![CDATA[Linear thermal expansion coefficient / °C -1 > GB*T24508-2020 <![CDATA[3.5×10 -5 ]]> <![CDATA[2.5×10 -5 ]]> <![CDATA[4.8×10 -5 ]]> Vicat softening point / ℃ GB*T8814-2017 121 127 110

[0057] As shown in Table 1, the present invention uses carbon beads instead of traditional calcium powder / talc, lubricants, antioxidants, and other raw materials, significantly improving precipitation and significantly improving deformation resistance. The PE wood-plastic composite material produced by the present invention is free of precipitation and has no reduction in production capacity.

[0058] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A PE wood-plastic composite material, characterized in that: The composition comprises the following components in parts by weight: 50-60 parts of wood flour, 10-20 parts of high-density polyethylene, 5-10 parts of low-density polyethylene, 10-15 parts of carbon beads and 2-4 parts of maleic anhydride grafted polyethylene; The carbon beads are prepared by: performing 3D printing using fly ash as a raw material to obtain spherical microbeads; and performing a pore-breaking treatment on the spherical microbeads to obtain the carbon beads. The pore size of the carbon beads is 25-35%.

2. The PE wood-plastic composite material according to claim 1, characterized in that The composition comprises the following components in parts by weight: 50-55 parts of wood flour, 10-15 parts of high-density polyethylene, 5-8 parts of low-density polyethylene, 11-14 parts of carbon beads and 2-3 parts of maleic anhydride grafted polyethylene.

3. The PE wood-plastic composite material according to claim 1 or 2, characterized in that: The carbon beads include first carbon beads and second carbon beads; The particle size of the first carbon beads is 900 mesh, and the particle size of the second carbon beads is 1200 mesh; the mass ratio of the first carbon beads to the second carbon beads is 4:

6.

4. The PE wood-plastic composite material according to claim 3, characterized in that The PE wood-plastic composite material further comprises a pigment.

5. The PE wood-plastic composite material according to claim 4, characterized in that: The pigment includes carbon black; Based on the weight of the wood powder, the weight of the pigment is 1 to 3 parts.

6. The method for preparing the PE wood-plastic composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: After the components of the PE wood-plastic composite material are mixed, a first melt extrusion, granulation and a second melt extrusion are sequentially performed to obtain the PE wood-plastic composite material.

7. The preparation method according to claim 6, characterized in that The granulation condition parameters include: the temperature of barrel 1 is 50°C, the temperature of barrel 2 is 120°C, the temperature of barrel 3 is 195°C, the temperature of barrel 4 is 195°C, the temperature of barrel 5 is 195°C, the temperature of barrel 6 is 195°C, the temperature of barrel 7 is 120°C, and the temperature of barrel 8 is 60°C; the main engine speed is 430rpm, and the current is 185-195A.

8. The preparation method according to claim 6, characterized in that The condition parameters of the first melt extrusion and the second melt extrusion independently include: the temperature of barrel 1 is 180°C, the temperature of barrel 2 is 185°C, the temperature of barrel 3 is 130°C, the temperature of barrel 4 is 130°C, the temperature of confluence core is 140°C, the temperature of mold 1 is 150°C, the temperature of mold 2 is 150°C, the temperature of mold 3 is 150°C, and the temperature of mold 4 is 150°C; the main engine speed is 20rpm, and the current is 45-50A.

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