A super-tough pulp board material and its preparation method

Abstract

The present invention relates to the field of materials for use on water, and particularly to a super-tough paddle board material and a preparation method thereof. The super-tough paddle board material is a foamed sheet material whose composition comprises at least nano-fillers and whose density is 50-65 kg / m<supgt;3< / supgt>. On the premise of maintaining good low density and low hygroscopicity, it can greatly enhance the hardness and toughness of the system, thereby greatly strengthening the application strength of the material and enabling the use of water sports equipment in more extreme environments and conditions.

Description

Technical Field

[0001] The present invention relates to the field of materials for water use, and particularly to a super-tough paddle board material and a preparation method thereof. Background Art

[0002] As a new type of material, foaming materials have been widely used in various fields such as transportation, building materials, plastic products, and daily necessities in recent years due to their excellent low density, mechanical properties, light weight, and high temperature resistance characteristics. Among them, materials for water use have become a large-scale application field for various foaming materials because they perfectly meet the performance requirements of foaming materials. The main problems faced by foaming materials for water use are waterproof and corrosion-resistant properties, as well as the mechanical properties of the foaming materials themselves.

[0003] The prior art (CN107234840A) provides a waterproof and corrosion-resistant polyurethane foaming material, which effectively improves the corrosion resistance and waterproofness of the polyurethane foaming material itself by adding a corrosion-resistant layer. However, the mechanical properties such as toughness of the polyurethane foaming material itself have not been significantly improved, and the materials prepared in some application environments still cannot be effectively used.

[0004] Therefore, to solve the above problems, the present application provides a super-tough paddle board material and a preparation method thereof. Summary of the Invention

[0005] To solve the above problems, in the first aspect of the present invention, there is provided a super-tough paddle board material, the super-tough paddle board material being a foamed sheet having a composition including at least nano-fillers and a density of 50 - 65 kg / m 3 .

[0006] As a preferred solution, the density of the super-tough paddle board material is 55 - 60 kg / m 3 .

[0007] As a preferred solution, the density of the super-tough paddle board material is 60 kg / m 3 .

[0008] As a preferred solution, the average particle size of the nano-fillers is 0.05 - 0.2 μm.

[0009] As a preferred solution, the average particle size of the nano-fillers is 0.08 - 0.1 μm.

[0010] As a preferred solution, the nano-fillers are at least one of zinc oxide, montmorillonite, bentonite, titanium dioxide, calcium carbonate, silica, talc powder, boehmite powder, and kaolin.

[0011] As a preferred solution, the nano-fillers are talc powder.

[0012] As a preferred solution, the base material of the foamed sheet is at least one of PP (polypropylene), PE (polyethylene), POE (ethylene-butene polymer), SEBS (styrene-ethylene-butene linear triblock copolymer), PC (polycarbonate), PO (polyolefin), OBC (ethylene-1-octene block copolymer), and TPU (thermoplastic polyurethane).

[0013] As a preferred solution, the base material is a mixture of PP and SEBS, and the mass ratio of PP to SEBS is 80 - 95:5 - 20.

[0014] As a preferred solution, the mass ratio of PP to SEBS is 85 - 90:10 - 15.

[0015] As a preferred solution, the mass ratio of PP to SEBS is 85:15.

[0016] In this application, by using a mixed polymer matrix of PP and SEBS, not only the low-density performance of the overall foamed material is ensured, but also the hardness and other mechanical properties of the foamed material can be improved in cooperation with the solid particle additives of the composition. The applicant believes that when the mass ratio of PP to SEBS is 85:15, a finer system pore size can be formed in the matrix material system compared to when they are used separately, generating more pore sites. The generation of these numerous pore sites can effectively help the system disperse stress in all directions when the system is subjected to external forces.

[0017] As a preferred solution, the mass ratio of the base material to the nano-filler is 96 - 99.5:0.5 - 4.

[0018] As a preferred solution, the mass ratio of the base material to the nano-filler is 99 - 99.5:0.5 - 1.

[0019] As a preferred solution, the mass ratio of the base material to the nano-filler is 99:1.

[0020] In this application, by adding talcum powder with a specific particle size and compounding it with the substrate used in this application, it can effectively improve the hardness of the material itself, and at the same time, through the closed-cell and connection effects of multi-aperture sites, it can greatly improve the toughness of the material itself. The applicant believes that when ultrafine talcum powder with a particle size of 0.08 - 0.1 μm is used as an additive, and when its mass ratio to the PP substrate of this application is 99:1, it not only serves as a particle support site in the system to support the substrate, but also can form a connection with the substrate in the fine pores formed in the substrate and move slightly from the pores. Therefore, when under the action of external force, it can become a stress dispersion site, so that when the substrate is about to tear, the crack can be re-converted into a crazing state.

[0021] In the second aspect of the present invention, a preparation method of the above-mentioned super-tough pulp board material is provided, and the steps include the following: (1) drying the nano-filler at 60 - 90 °C for 2 - 3 hours, then mixing it evenly with the substrate, and then extruding and pelletizing through a twin-screw extruder, and extruding into a sheet through a sheet extruder to control the thickness; (2) placing the sheet into an autoclave, introducing a fluid foaming medium, heating to 120 - 160 °C, controlling the pressure, and infiltrating and foaming for 4 - 8 hours, and controlling the pressure relief time to obtain the product.

[0022] As a preferred solution, the thickness of the extruded sheet is 10 - 15 mm; the pressure is 10 - 30 MPa; the pressure relief time is 20 - 40 s.

[0023] As a preferred solution, the thickness of the extruded sheet is 12 - 13 mm; the pressure is 20 MPa; the pressure relief time is 30 s.

[0024] As a preferred solution, the fluid foaming medium is N2 and / or CO2.

[0025] As a preferred solution, the fluid foaming medium is CO2.

[0026] In this application, by controlling the parameters in the foaming preparation method and the fluid medium, the foaming effect of the foamed material is effectively improved, and the expansion of pores in the foamed substrate is avoided, thereby reducing the phenomenon of moisture absorption resistance. When the selected foaming fluid medium is CO2, the liquid state can better infiltrate the foaming collection in the autoclave, and under the synergistic effect of talcum powder, a better foaming effect can be formed in the foaming stage, avoiding the leakage of the fluid medium during the foaming process, so as to perform uniform foaming and obtain a foamed board with uniform foaming and smaller foaming pores. Moreover, in this application, by controlling the thickness, pressure and final pressure relief time of the sheet, the cell size of the foamed material can be effectively maintained, and a good material density can be maintained.

[0027] Beneficial effects:

[0028] 1. The present application provides a water paddle board material with ultra-low density and high toughness, which can greatly enhance the hardness and toughness of the system while maintaining good low density and low hygroscopicity, thereby greatly strengthening the application strength of the material and enabling the use of water sports equipment in more extreme environments and conditions.

[0029] 2. The present application provides a water paddle board material with ultra-low density and high toughness. By adding talcum powder with a specific particle size and compounding it with the base material used in the present application, it can effectively improve the hardness of the material itself, and at the same time, through the closed pore and connection effects of multi-aperture sites, it can greatly improve the toughness of the material itself. When ultrafine talcum powder with a particle size of 0.08 - 0.1 μm is used as an additive and its mass ratio to the PP base material of the present application is 99:1, connections with the base material can be formed in the fine pores formed in the base material and move slightly from the pores. Therefore, when under external force, it can become a stress dispersion site, so that when the base material is about to tear, the crack can be re-converted into a crazing state.

[0030] 3. The present application provides a water paddle board material with ultra-low density and high toughness. By using a mixed polymer matrix of PP and SEBS, it not only ensures the low density performance of the overall foamed material, but also can synergistically improve the overall hardness and other mechanical properties of the foamed material with the solid particle additives of the composition. When the mass ratio of PP to SEBS is 85:15, it can form a finer system pore size in the matrix material system compared to when they are used separately, generating more pore sites. The generation of these a large number of pore sites can effectively help the system disperse stress in all directions when the system is under external force. Description of the Drawings

[0031] Figure 1 It is a physical diagram of the super-tough paddle board material prepared in Example 1 of the present application. Detailed Embodiments

[0032] Example 1

[0033] Example 1 provides a super-tough paddle board material in the first aspect, and the raw materials include 1 wt% of nano-fillers and 99 wt% of the base material.

[0034] The density of the super-tough paddle board material is 60 kg / m 3 .

[0035] The nano-fillers are talcum powder with an average particle size of 0.1 μm, purchased from the 0.1 μm talcum powder product sold by Shijiazhuang Xu'ang Mineral Products Co., Ltd.; the base material is a mixture of PP and SEBS, and the mass ratio of PP to SEBS is 85:15.

[0036] PP and SEBS were purchased from Zhenhai Refining & Chemical M60T and Kraton SEBS-1650 respectively.

[0037] In the second aspect of this embodiment, a method for preparing a super-tough pulp board material is provided. The steps include the following: (1) drying the nano-filler at 80 °C for 2 hours, then mixing it evenly with the substrate, and then extruding and pelletizing it through a twin-screw extruder, and extruding it into a sheet through a sheet extruder to control the thickness; (2) placing the sheet into an autoclave, introducing a fluid foaming medium, heating to 135 °C, controlling the pressure, infiltrating and foaming for 6 hours, and controlling the pressure relief time to obtain the product.

[0038] The thickness of the extruded sheet is 13 mm; the pressure is 20 MPa; the pressure relief time is 30 s; the fluid foaming medium is CO2.

[0039] Example 2

[0040] The specific implementation manner of this embodiment is the same as that of Example 1, except that: in the method for preparing the super-tough pulp board material, in step (2), the thickness of the extruded sheet is 12 mm; the pressure is 25 MPa; the pressure relief time is 35 s; the fluid foaming medium is CO2.

[0041] Comparative Example 1

[0042] The specific implementation manner of this comparative example is the same as that of Example 1, except that: the nano-filler is talc powder with an average particle size of 0.2 μm, which is purchased from the 0.2 μm talc powder product sold by Shijiazhuang Xu'ang Mineral Products Co., Ltd.

[0043] Comparative Example 2

[0044] The specific implementation manner of this comparative example is the same as that of Example 1, except that: for the super-tough pulp board material, the raw materials include 0.3 wt% of nano-filler and 99.7% of substrate.

[0045] Comparative Example 3

[0046] The specific implementation manner of this comparative example is the same as that of Example 1, except that: the mass ratio of PP and SEBS is 95:5.

[0047] Performance Evaluation

[0048] Density test: 10 specimens were tested for each example and comparative example, and the densities of the materials obtained from the examples and comparative examples were measured. A digital density tester was used as the test instrument, and the average value of the measured values was recorded in Table 1.

[0049] Shore hardness (A): Place the specimen on a firm plane. The indenter is 12 mm away from the edge of the specimen. Press the indenter steadily onto the specimen so that the indenter vertically penetrates the specimen. Read the value within 1 s when the indenter and the specimen are in full contact. Measure the hardness value 5 times at different positions where the measuring points are at least 6 mm apart, and take the average value. Instrument: HTS-800A digital Shore hardness tester produced by Shanghai Yizong Precision Instrument Co., Ltd.

[0050] Flexural strength: Prepare the splines of the examples and comparative examples. The splines refer to GB / T 9341-2000 and are tested on an electronic universal testing machine. The pressing speed is 2 mm / min, and the fixed displacement is 6 mm. The results are recorded in Table 1.

[0051] Delamination tearing strength: Test the materials prepared in the examples and comparative examples with reference to ASTM D624-00(2012). The results are recorded in Table 1.

[0052] Table 1

[0053] Example <![CDATA[Density kg / m 3 > Shore hardness C Flexural strength / mpa Delamination tearing strength / KN / m Example 1 80 68 0.72 3.5 Example 2 68 60 0.65 2.7 Comparative Example 1 80 52 0.58 2.4 Comparative Example 2 92 70 0.61 2.8 Comparative Example 3 85 75 0.59 2.5

Claims

1. A super-tough pulp board material, characterized in that: The super-tough pulp board material is a foamed sheet with a composition including at least nano-fillers and a density of 50 to 65 kg / m 3 ; The average particle size of the nano filler is 0.08 - 0.1 μm; The substrate is a mixture of PP and SEBS, and the mass ratio of PP to SEBS is (80 - 95):(5 - 20); The mass ratio of the substrate to the nano filler is (96 - 99.5):(0.5 - 4).

2. The super-tough pulp board material according to claim 1, wherein: The nano filler is at least one of zinc oxide, montmorillonite, bentonite, titanium dioxide, calcium carbonate, silica, talc powder, boehmite powder, kaolin.

3. The super-tough pulp board material according to claim 2, characterized in that: The mass ratio of PP to SEBS is 85 - 90:10 - 15.

4. A method for preparing the super-tough pulp board material according to claim 3, characterized in that: The steps include the following: (1) Dry the nano filler at 60 - 90 °C for 2 - 3 hours, then mix it evenly with the substrate, and then extrude and pelletize it through a twin-screw extruder, and extrude it into a sheet through a sheet extruder, and control the thickness; (2) Place the sheet into an autoclave, introduce a fluid foaming medium, heat it to 120 - 160 °C, control the pressure, and soak and foam for 4 - 8 hours, and control the pressure relief time to obtain the product.

5. The preparation method of the super-tough pulp board material according to claim 4, characterized in that: The thickness of the extruded sheet is 10 - 15 mm; the pressure is 10 - 30 MPa; the pressure relief time is 20 - 40 s.

6. The preparation method of the super-tough pulp board material according to claim 5, characterized in that: The fluid foaming medium is N2 and / or CO2.

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