Solid waste-aramid fiber stone base paper and preparation method thereof

Abstract

The invention relates to solid waste-aramid fiber stone-based paper and a preparation method thereof, inorganic powder such as coal gangue, steel slag, calcium carbonate and the like, polyethylene and aramid fiber fibrid are used as main raw materials, other auxiliaries are added, and the solid waste-aramid fiber stone-based paper is prepared through the steps of material drying, material grinding, material soaking, material mixing, high-speed stirring, wet-process papermaking, cold-press shaping, paper blank drying, hot-press molding, cooling and cutting. The manufacturing of the solid waste-aramid fiber stone base paper is completed. The whole preparation process is simple, solid wastes are reasonably utilized, the cost is saved, and efficient resource utilization of the solid wastes is realized; meanwhile, compared with common aramid paper, the prepared solid waste-aramid fiber stone base paper has a good moisture-proof effect.

Description

Technical Field

[0001] The invention belongs to the technical field of solid waste recycling and relates to solid waste-aramid stone-based paper and a preparation method thereof. Background Art

[0002] Aramid paper, also known as "polyaramid fiber paper", is made of aramid short fibers and aramid precipitated fibers as papermaking raw materials, wet-formed by oblique screen papermaking, and then hot-pressed. Aramid paper has good insulation and anti-aging properties and is a very special new type of high-tech synthetic material. Although it has excellent performance, the high price of aramid makes aramid paper expensive. Summary of the invention

[0003] In view of the defects and shortcomings in the prior art, the purpose of the present invention is to provide a method for preparing solid waste-aramid stone-based paper to solve the problem that the existing aramid paper has large consumption and high price.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0005] A solid waste-aramid stone-based paper is composed of aramid precipitated fibers, calcium carbonate, solid waste, polyethylene powder and additives.

[0006] Preferably, the solid waste is steel slag or coal gangue, and the auxiliary agent is a dispersant; the mass proportions of aramid fibrils, calcium carbonate, solid waste, polyethylene powder and dispersant are 40:(15-25):(5-10):20:5.

[0007] A method for preparing solid waste-aramid stone-based paper specifically comprises the following steps:

[0008] S1, drying and grinding calcium carbonate and solid waste respectively to obtain calcium carbonate powder and solid waste powder; soaking aramid fibrids in water to obtain soaked aramid fibrids;

[0009] S2, mixing and stirring the calcium carbonate powder, the solid waste powder, the soaked aramid fibrid, the polyethylene powder and the additive to obtain a first mixture; and adding water to the first mixture in a high-speed mixer and stirring at high speed to obtain a second mixture;

[0010] S3, adding the second mixture obtained in S2 into a papermaking machine for vacuum suction to obtain a wet paper embryo;

[0011] S4, sequentially cold-pressing and shaping, wet-paper drying and hot-pressing the wet paper blank obtained in S3 to obtain solid waste-aramid stone-based paper.

[0012] Preferably, the solid waste is steel slag or coal gangue, and the auxiliary agent is a dispersant; the mass proportions of aramid fibrils, calcium carbonate, solid waste, polyethylene powder and dispersant are 40:(15-25):(5-10):20:5.

[0013] Preferably, the mesh size of calcium carbonate powder is 500-2000 mesh, the mesh size of solid waste powder is 300-600 mesh, and the particle size of polyethylene powder is 100 mesh.

[0014] Preferably, the drying temperature of the calcium carbonate and the solid waste in S1 is 110 to 180 degrees Celsius, and the soaking time of the aramid fibrils in S1 is 4 to 8 hours.

[0015] Preferably, the rotation speed of the high-speed stirrer in S2 is 1000-2000 rpm, and the stirring time is 5-10 min.

[0016] Preferably, the vacuum degree of the vacuum suction of the paper sheet copying device in S3 is -0.05 to -0.1 MPa.

[0017] Preferably, the cold pressing pressure of the cold pressing in S4 is 10-30 MPa, and the time is 5-10 minutes; the hot pressing temperature of the hot pressing in S4 is 150-200° C., the hot pressing pressure is 10-30 MPa, and the hot pressing time is 10-30 min.

[0018] Preferably, the solid waste-aramid stone-based paper obtained in S4 has a thickness of 0.1 to 0.3 mm.

[0019] The above technical solution has the following beneficial effects:

[0020] The solid waste-aramid stone-based paper and preparation method thereof of the present invention reasonably utilize solid waste, not only save costs but also realize efficient resource utilization of solid waste; at the same time, the prepared solid waste-aramid stone-based paper has a good moisture-proof effect compared with ordinary aramid paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a physical picture of the steel slag-aramid stone-based paper of Example 1.

[0022] Figure 2 This is a scanning electron microscope image of the steel slag-aramid stone-based paper of Example 1.

[0023] Figure 3 This is a physical picture of the coal gangue-aramid stone-based paper in Example 2.

[0024] Figure 4 This is a scanning electron microscope image of the coal gangue-aramid stone based paper in Example 2.

[0025] Figure 5This is a physical picture of the steel slag-aramid stone-based paper of Example 3.

[0026] Figure 6 This is a scanning electron microscope image of the steel slag-aramid stone-based paper in Example 3.

[0027] Figure 7 This is a physical picture of the coal gangue-aramid stone-based paper in Example 4.

[0028] Figure 8 This is a scanning electron microscope image of the coal gangue-aramid stone based paper in Example 4.

[0029] Fig. 9 This is a physical picture of the aramid stone-based paper in Comparative Example 1.

[0030] Fig.10 This is a scanning electron microscope image of the aramid stone-based paper in Comparative Example 1.

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0032] The reagents and instruments used in the present invention are all commercially available.

[0033] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings, examples and comparative examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Therefore, within the scope of the claims and their equivalents, the present invention may be implemented in a manner different from the following specific description.

[0034] The gangue in this application is a solid waste discharged during the coal mining process and the coal washing process. It is a black-gray rock with a lower carbon content and harder than coal that is associated with the coal seam during the coal formation process. The chemical composition of gangue is mainly inorganic and organic matter, and the inorganic components are generally oxides of silicon, aluminum, calcium, magnesium, and iron and some rare metals. Gangue is a mixture of various mineral rocks, mainly clay rocks, sandstones, carbonates, and aluminous rocks. Clay rocks account for a considerable proportion of gangue, especially carbonaceous shale, mud shale and silt shale are the most common. The main mineral components of gangue are clay minerals, such as kaolinite, montmorillonite, illite, etc., followed by quartz, feldspar, pyrite, etc. and a small amount of rare metal oxides. Coal gangue includes excavation gangue during tunnel excavation, gangue mined from the roof, floor and interlayer during mining, and washed gangue picked out during coal washing.

[0035] Steel slag is a by-product of the steelmaking process. It is composed of various oxides formed by the oxidation of impurities such as silicon, manganese, phosphorus, and sulfur in pig iron during the smelting process, as well as salts formed by the reaction of these oxides with solvents. Steel slag contains a variety of useful components: 2% to 8% metallic iron, 40% to 60% calcium oxide, 3% to 10% magnesium oxide, and 1% to 8% manganese oxide, so it can be used as a raw material for steel metallurgy. The mineral composition of steel slag is mainly tricalcium silicate, followed by dicalcium silicate, RO phase, dicalcium ferrite, and free calcium oxide. Steel slag is clinker, a remelting phase, and has a low melting temperature. When remelted, the liquid phase is formed early and has good fluidity.

[0036] The specific source of the coal gangue in this embodiment is provided by Shaanxi Shendong Coal Mine Group Co., Ltd., China, with a composition of SiO2 34.1%, A12O3 18.72%, Fe2O3 14.91%, CaO 17.9%, MgO 2.30%, and TiO2 0.70%; the specific source of the steel slag is Shaanxi Iron and Steel Group Daxigou Mining Company, with a composition of CaO 32.57%, FeO2 4.55%, MgO 11.67%, SiO2 11.3%, and P 1.362%.

[0037] Embodiment 1:

[0038] This embodiment provides a method for preparing steel slag-aramid stone-based paper, which specifically comprises the following steps:

[0039] S1, material drying;

[0040] Step 1 - Dry the calcium carbonate and steel slag in a drying oven at 110°C for 8 hours.

[0041] Step 2 - Grinding of materials: Grind calcium carbonate and steel slag in a ball mill for 2 hours, and sieve out calcium carbonate with a particle size of 1250 mesh and steel slag with a particle size of 800 mesh.

[0042] Step 3 - Material soaking: soak the aramid fiber in deionized water for 8 hours;

[0043] Step 4 - Mixing the materials: Mix the materials in the following proportions: 40% aramid fibrid, 25% calcium carbonate, 10% steel slag, 20% polyethylene, and 5% dispersant, by weight percentage. The weight of the aramid fibrid is the weight before soaking.

[0044] The dispersant is at least one of stearic acid, calcium stearate, and zinc stearate. The specific mixing steps are: firstly, calcium carbonate and steel slag are mixed, then the dispersant is added to treat the surface of the powder, and then polyethylene and aramid fiber are added;

[0045] Step 5 - High-speed stirring: put the above mixture in a high-speed mixer and add water to mix well. The speed of the high-speed mixer is 1500 rpm and the stirring time is 10 minutes;

[0046] Step 6 - Pumping and papermaking: Add the mixed materials into the paper machine for vacuum suction to obtain wet paper embryos. The vacuum degree of the paper machine is -0.05MPa.

[0047] Step 7 - Cold pressing and shaping: put the fried wet paper blank into the cold press machine and cold press it at 10MPa for 5 minutes;

[0048] Step 8 - Drying the wet paper: Dry the cold pressed wet paper at 110°C for 10 minutes;

[0049] The ninth step - hot pressing molding, hot pressing the dried paper to obtain solid waste-aramid stone-based paper, the hot pressing temperature is 180°C, the hot pressing pressure is 15MPa, and the hot pressing time is 30min.

[0050] In this embodiment, the characterization data of the steel slag-aramid stone-based paper are as follows:

[0051] The actual picture of steel slag-aramid stone-based paper is as follows Figure 1 shown.

[0052] SEM of steel slag-aramid stone-based paper Figure 2 shown.

[0053] Embodiment 2:

[0054] This embodiment provides a method for preparing coal gangue-aramid stone-based paper. The specific steps of the method are basically the same as those of Example 1, except that the solid waste used in Example 2 is coal gangue, and the raw material ratio is different.

[0055] The raw material ratio of the method is: by weight percentage, 40% of aramid fiber precipitation, 25% of calcium carbonate, 10% of coal gangue, 20% of polyethylene, and 5% of dispersant.

[0056] In this embodiment, the characterization data of the gangue-aramid stone-based paper are as follows:

[0057] The actual picture of coal gangue-aramid stone-based paper is as follows Figure 3 shown.

[0058] SEM images of gangue-aramid stone based paper Figure 4 shown.

[0059] Embodiment 3:

[0060] This embodiment provides a method for preparing steel slag-aramid stone-based paper. The specific steps of the method are basically the same as those of Example 1, except that the raw material ratio is different.

[0061] The raw material ratio of the method is: by weight percentage, 40% of aramid fiber precipitation, 15% of calcium carbonate, 20% of steel slag, 20% of polyethylene, and 5% of dispersant.

[0062] In this embodiment, the characterization data of the steel slag-aramid stone-based paper are as follows:

[0063] The actual picture of steel slag-aramid stone-based paper is as follows Figure 5 shown.

[0064] SEM of steel slag-aramid stone-based paper Figure 6 shown.

[0065] Embodiment 4:

[0066] This embodiment provides a method for preparing coal gangue-aramid stone-based paper. The specific steps of the method are basically the same as those of Example 1, except that the solid waste used in Example 4 is coal gangue, and the raw material ratio is different.

[0067] The raw material ratio of this method is

[0068] The materials are mixed in the following proportions: 40% aramid fibrid, 15% calcium carbonate, 20% coal gangue, 20% polyethylene, and 5% dispersant, by weight.

[0069] In this embodiment, the characterization data of the gangue-aramid stone-based paper are as follows:

[0070] The actual picture of coal gangue-aramid stone-based paper is as follows Figure 7 shown.

[0071] SEM images of gangue-aramid stone based paper Figure 8 shown.

[0072] Comparative Example 1:

[0073] This embodiment provides a method for preparing aramid stone-based paper. The specific steps of the method are basically the same as those of Example 1, except that no solid waste is added and the raw material ratio is different.

[0074] The specific proportions of this comparative example are: by weight percentage, aramid fibrid 40%, calcium carbonate 35%, polyethylene 20%, and dispersant 5%. The dispersant is at least one of stearic acid, calcium stearate, and zinc stearate.

[0075] In this comparative example, the characterization data of stone paper are as follows:

[0076] The actual picture of aramid stone-based paper is as follows Fig. 9 shown.

[0077] Scanning electron microscopy of aramid stone-based paper Fig.10 shown.

[0078] By comparing the physical images and scanning electron microscope images of Examples 1, 2, 3, and 4 with those of Comparative Example 1, the following conclusions can be drawn:

[0079] Comparative Example 1 did not add solid waste, Example 1 added 10% steel slag, Example 2 added 10% coal gangue, Example 3 added 20% steel slag, and Example 4 added 20% coal gangue. By comparison, it was found that: the actual surface flatness of the five samples was similar, and the surface color of the samples with added solid waste was slightly darker; by observing the scanning electron microscope images of the five samples, it was found that their dispersibility was also similar, and the surface of the paper with added solid waste was denser, indicating that the reasonable use of solid waste can fill the gaps of the pores; in addition, the use of solid waste can reduce costs.

Claims

1. A solid waste-aramid stone-based paper, characterized in that: It consists of aramid precipitated fibers, calcium carbonate, solid waste, polyethylene powder and additives.

2. The solid waste-aramid stone-based paper according to claim 1, characterized in that: The solid waste is steel slag or coal gangue, and the auxiliary agent is a dispersant; The mass proportions of the aramid fibrils, calcium carbonate, solid waste, polyethylene powder and dispersant are 40:(15-25):(5-10):20:

5.

3. A method for preparing solid waste-aramid stone-based paper, characterized in that: The specific steps include: S1, drying and grinding calcium carbonate and solid waste respectively to obtain calcium carbonate powder and solid waste powder; soaking aramid fibrids in water to obtain soaked aramid fibrids; S2, mixing and stirring the calcium carbonate powder, the solid waste powder, the soaked aramid fibrid, the polyethylene powder and the additive to obtain a first mixture; and adding water to the first mixture in a high-speed mixer and stirring at high speed to obtain a second mixture; S3, adding the second mixture obtained in S2 into a papermaking machine for vacuum suction to obtain a wet paper embryo; S4, sequentially cold-pressing and shaping, wet-paper drying and hot-pressing the wet paper blank obtained in S3 to obtain solid waste-aramid stone-based paper.

4. The method for preparing solid waste-aramid stone-based paper according to claim 3, characterized in that: The solid waste is steel slag or coal gangue, and the auxiliary agent is a dispersant; The mass proportions of the aramid fibrils, calcium carbonate, solid waste, polyethylene powder and dispersant are 40:(15-25):(5-10):20:

5.

5. The method for preparing solid waste-aramid stone-based paper according to claim 4, characterized in that: The mesh size of the calcium carbonate powder is 500-2000 meshes, the mesh size of the solid waste powder is 300-600 meshes, and the particle size of the polyethylene powder is 100 meshes.

6. The method for preparing solid waste-aramid stone-based paper according to claim 5, characterized in that: The drying temperature of the calcium carbonate and the solid waste in the S1 is 110 to 180 degrees Celsius, and the soaking time of the aramid fibrils in the S1 is 4 to 8 hours.

7. The method for preparing solid waste-aramid stone-based paper according to claim 5, characterized in that: The rotation speed of the high-speed stirrer in S2 is 1000-2000 rpm, and the stirring time is 5-10 min.

8. The method for preparing solid waste-aramid stone-based paper according to claim 5, characterized in that: The vacuum degree of the vacuum suction of the paper sheet copying device in S3 is -0.05 to -0.1 MPa.

9. The method for preparing solid waste-aramid stone-based paper according to claim 5, characterized in that: The cold pressing pressure of the cold pressing and shaping in S4 is 10-30 MPa and the time is 5-10 minutes; The hot pressing temperature of the hot pressing molding in S4 is 150-200° C., the hot pressing pressure is 10-30 MPa, and the hot pressing time is 10-30 min.

10. The method for preparing solid waste-aramid stone-based paper according to any one of claims 3 to 9, characterized in that: The thickness of the solid waste-aramid stone-based paper obtained in S4 is 0.1 to 0.3 mm.

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