A breathable skateboard brick outer layer material and preparation method thereof

Abstract

The present invention provides a breathable skateboard brick outer layer material and a preparation method thereof, and relates to the technical field of refractory materials. The material comprises the following raw materials by mass fraction: 15 to 33 parts of quartz stone particles, 5 to 15 parts of pyrope stone particles, 20 to 30 parts of waste silica brick particles, 15 to 25 parts of quartz stone fine powder, 8 to 18 parts of waste silica brick fine powder, 1 to 3 parts of silicon micropowder, 0.5 to 3.0 parts of ball clay fine powder, and 3 to 6 parts of thermosetting phenolic resin. The present invention uses pyrope stone particles with low cost and large reserves and waste silica bricks as refractory materials instead of expensive corundum graphite, etc., which reduces the production cost, and the silicon micropowder and ball clay fine powder are sintered when used under high temperature conditions, so that the strength of the skateboard outer layer material is increased, and the strength of the skateboard can be prevented from deteriorating due to resin oxidation.

Description

Technical Field

[0001] The invention relates to the technical field of refractory materials, and in particular to an outer layer material of a breathable skateboard brick and a preparation method thereof. Background Art

[0002] The sliding system used in the steelmaking ladle consists of a sliding mechanical part, a driving device and refractory materials (including upper and lower nozzles, inner and outer slides). The working principle of the slide sliding system is to drive the outer slide to slide through the sliding frame to achieve the purpose of controlling the flow of molten steel by the slide.

[0003] Existing skateboards are mostly made of machine-pressed skateboard bricks, which are mainly made of plate-shaped corundum, graphite, carbon black, metal aluminum, metal silicon, boron carbide, etc. as raw materials, and phenolic resin as a binder, mixed and pressed. This kind of full-material skateboard is relatively expensive and wastes a lot of high-grade refractory raw material resources. Most domestic skateboard bricks are made by using different inner and outer layer raw materials and pressing them through electric screw machines. The inner layer needs to use high-grade raw materials because it contacts molten steel and steel slag; ordinary refractory raw materials are used on the back side (outer layer) of the skateboard that does not contact molten steel. As for the outer layer material of the skateboard, as long as its strength is ≥80MPa and its refractoriness is ≥1700℃, it can meet the micro-expansion in an environment of 1300℃, and support the inner layer material to ensure the normal use of the skateboard and meet the installation requirements in the skateboard structure.

[0004] In summary, how to reduce the cost of the outer layer of the skateboard while ensuring its strength, anti-peeling, micro-expansion performance, etc., while meeting the requirements of skateboard use and trying not to increase production costs, is an urgent problem to be solved for composite skateboards. Summary of the invention

[0005] The purpose of the present invention is to provide a breathable skateboard brick outer layer material and a preparation method thereof, so as to solve the problem that the skateboard brick raw material cost used in the existing steel smelting process is high, resulting in waste of high-grade refractory material resources.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A breathable skateboard brick outer layer material comprises the following raw materials in mass fractions: 15 to 33 parts of quartz stone particles, 5 to 15 parts of charcoal stone particles, 20 to 30 parts of waste silica brick particles, 15 to 25 parts of quartz stone fine powder, 8 to 18 parts of waste silica brick fine powder, 1 to 3 parts of silicon micropowder, 0.5 to 3.0 parts of ball clay fine powder, and 3 to 6 parts of thermosetting phenolic resin.

[0008] Preferably, the thermosetting phenolic resin is PF-5323 thermosetting phenolic resin.

[0009] Preferably, the particle size of the quartz particles is 0-5 mm, wherein the mass ratio of 5-3 mm: 3-1 mm: 1-0 mm is 4-9: 12-20: 7-12, 5-3 mm quartz particles include 5 mm but not 3 mm, 3-1 mm quartz particles include 3 mm but not 1 mm, and 1-0 mm quartz particles include 1 mm but not 0 mm;

[0010] The particle size of the waste silicon brick particles is 0-3 mm, wherein the mass ratio of 3-1 mm:1-0 mm is 12-22:5-15, 3-1 mm waste silicon brick particles include 3 mm but not 1 mm, and 1-0 mm waste silicon brick particles include 1 mm but not 0 mm;

[0011] The particle size of the coke gemstone particles is 1-0 mm; the particle size of the quartz stone fine powder is 200-320 meshes; the particle size of the waste silicon brick fine powder is 180-240 meshes; the particle size of the silicon micropowder is 1-3 μm; and the particle size of the ball clay fine powder is 1-5 μm.

[0012] Preferably, the mass fraction of SiO2 in the quartz particles and quartz fine powder is independently ≥97%, the mass fraction of Fe2O3 is independently ≤0.6%, and the total mass fraction of Na2O and K2O is independently ≤0.5%;

[0013] The mass fraction of SiO2 in the waste silicon brick particles and waste silicon brick fine powder is independently ≥97%, the mass fraction of Fe2O3 is independently ≤1.5%, and the total mass fraction of Na2O and K2O is independently ≤1.5%;

[0014] The substances in the coke gemstone particles are calculated by mass percentage, wherein the content of Al2O3 is 40-47%, the content of SiO2 is 47-59%, the content of Fe2O3 is 0.2-1.5%, and the total content of Na2O and K2O is 0.1-0.2%;

[0015] The mass percentage of Al2O3 in the ball clay fine powder is 30-35%, and the mass percentage of Fe2O3 is 1.0-1.6%; the refractoriness of the ball clay fine powder is ≥1700°C, and the plasticity index is 20-32;

[0016] The mass fraction of SiO2 in the silicon micropowder is ≥93.0%, and the total mass fraction of Na2O and K2O is ≤0.6%;

[0017] The thermosetting phenolic resin has a viscosity of 16-19 Pa.s at 25° C., a residual carbon content of ≥42%, a solid content of 78-83%, a moisture content of ≤3.0%, and a pH value of 7.0-8.0.

[0018] The present invention also provides a method for preparing an outer layer material of a breathable skateboard brick, comprising the following steps:

[0019] 1) ball-milling quartz stone fine powder, waste silica brick fine powder, silicon powder and ball clay fine powder to obtain co-grinded powder; dry-mixing quartz stone particles, coke gem particles and waste silica brick particles, adding thermosetting phenolic resin and mixing and grinding to obtain mixed aggregate;

[0020] 2) The co-ground powder obtained in step 1) and the mixed aggregate are mixed and ground to obtain the outer layer material of the breathable skateboard brick.

[0021] Preferably, the ball milling time in step 1) is 30 to 60 minutes, and the rotation speed is 15 to 25 r / min.

[0022] Preferably, the dry mixing time of the aggregate in step 1) is 3 to 8 minutes, and the rotation speed is 35 to 50 r / min;

[0023] The mixing and grinding time is 5 to 8 minutes, and the rotation speed is 35 to 50 r / min.

[0024] Preferably, the mixing and grinding time in step 2) is 25 to 35 minutes, and the rotation speed is 35 to 50 r / min.

[0025] The present invention has at least the following beneficial effects:

[0026] 1. The present invention adopts waste silicon brick particles, waste silicon brick fine powder, coke gem particles and the like which have high mineral output and low price as raw materials to replace traditional refractory raw materials such as metal silicon, boron carbide and corundum to prepare the outer layer material of the breathable skateboard brick, thereby reducing the production cost; the combination of silicon micropowder and ball clay fine powder in the matrix can improve the sintering of the outer layer material at the use temperature, thereby increasing the strength of the outer layer material; the thermosetting phenolic resin has high strength as a binder.

[0027] 2. The finished skateboard brick product produced by using the breathable skateboard brick outer layer material prepared by the present invention has a volume density of 1.8-1.95 g / cm after drying at 220°C for 24 hours. 3 , the apparent porosity is 8-15%, the compressive strength is ≥80MPa, and the linear change rate after heating for 3h at 1300℃ is 0-0.3%. The above performance parameters ensure that the skateboard bricks can resist the pressure of molten steel and mechanisms, and prevent the skateboard bricks from breaking and deforming; the micro-expansion absorption and dissipation of elastic strain energy of the outer layer material can alleviate the destructive effect of thermal stress on the skateboard, improve the thermal shock stability of the skateboard, and enhance its anti-stripping property.

[0028] 3. The present invention adds a certain amount of coke quartz particles in the process of preparing the outer layer material of the breathable skateboard brick, which can effectively improve the problem that the quartz raw material is prone to expansion at a high temperature of 800-1100°C, causing the outer layer material of the skateboard to deform and fall off, and makes its linear change around 1300°C very small, ensuring that the overall linear change rate of the skateboard brick is not large, preventing the skateboard brick from bursting during use, and improving its safety and stability.

[0029] 4. The present invention adds silicon micropowder and ball clay fine powder in the process of preparing the outer layer material of the breathable skateboard brick. When the above skateboard brick is used for a long time at high temperature, the silicon micropowder and ball clay fine powder in the formula are sintered at a high temperature of 800-1300°C, so that the strength of the skateboard outer layer material is increased, preventing the skateboard from deteriorating in strength due to resin oxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a process flow chart for preparing the outer layer material of the breathable skateboard brick. DETAILED DESCRIPTION

[0031] The invention provides an outer layer material of a breathable skateboard brick, comprising the following raw materials in parts by mass: 15 to 33 parts of quartz stone particles, 5 to 15 parts of charcoal stone particles, 20 to 30 parts of waste silica brick particles, 15 to 25 parts of quartz stone fine powder, 8 to 18 parts of waste silica brick fine powder, 1 to 3 parts of silicon micropowder, 0.5 to 3.0 parts of ball clay fine powder, and 3 to 6 parts of thermosetting phenolic resin.

[0032] In the present invention, the thermosetting phenolic resin is PF-5323 thermosetting phenolic resin.

[0033] In the present invention, the quartz particles are 15 to 33 parts, preferably 18 to 30 parts, more preferably 20 to 28 parts, and more preferably 23 to 25 parts; the particle size of the quartz particles is 0 to 5 mm, wherein the mass ratio of 5 to 3 mm: 3 to 1 mm: 1 to 0 mm is 4 to 9: 12 to 20: 7 to 12, preferably 5 to 8: 14 to 18: 8 to 10, and more preferably 6 to 7: 15 to 16: 9, wherein 5 to 3 mm quartz particles include 5 mm but not 3 mm, 3 to 1 mm quartz particles include 3 mm but not 1 mm, and 1 to 0 mm quartz particles include 1 mm but not 0 mm.

[0034] In the present invention, the mass fraction of the waste silicon brick particles is 20 to 30 parts, preferably 22 to 28 parts, further preferably 23 to 27 parts, and more preferably 24 to 25 parts; the particle size of the waste silicon brick particles is 0 to 3 mm, wherein the mass ratio of 3 to 1 mm: 1 to 0 mm is 12 to 22: 5 to 15, preferably 14 to 20: 8 to 13, and further preferably 15 to 17: 9 to 12, wherein the waste silicon brick particles of 3 to 1 mm include 3 mm but not 1 mm, and the waste silicon brick particles of 1 to 0 mm include 1 mm but not 0 mm.

[0035] In the present invention, the mass fraction of the coke gemstone particles is 5 to 15 parts, preferably 7 to 13 parts, and more preferably 9 to 11 parts; the particle size of the coke gemstone particles is 1 to 0 mm, preferably 0.1 to 0.8 mm, more preferably 0.3 to 0.7 mm, and more preferably 0.7 mm.

[0036] In the present invention, the mass fraction of the quartz fine powder is 15 to 25 parts, preferably 17 to 23 parts, and more preferably 19 to 21 parts; the particle size of the quartz fine powder is 200 to 320 meshes, more preferably 240 to 280 meshes, and more preferably 250 meshes.

[0037] In the present invention, the mass fraction of the waste silica brick fine powder is 8 to 18 parts, preferably 11 to 17 parts, and more preferably 13 to 15 parts; the particle size of the waste silica brick fine powder is 180 to 240 mesh, preferably 190 to 230 mesh, more preferably 200 to 220 mesh, and more preferably 205 to 215 mesh.

[0038] The mass fraction of the silicon micropowder is 1 to 3 parts, preferably 1.5 to 2.5 parts, and more preferably 2 parts; the particle size of the silicon micropowder is 1 to 3 μm, preferably 1.5 to 2.5 μm, and more preferably 1.8 to 2.3 μm.

[0039] The mass fraction of the ball clay fine powder is 0.5 to 3.0 parts, preferably 0.8 to 2.5 parts, and more preferably 1.5 to 2.3 parts; the particle size of the ball clay fine powder is 1 to 5 μm, preferably 1.7 to 4.3 μm, more preferably 2.0 to 3.6 μm, and more preferably 2.5 to 3.0 μm.

[0040] In the present invention, the mass fraction of SiO2 in the quartz particles and quartz fine powder is independently ≥97%, preferably 97.5% to 99.5%, and more preferably 98% to 99%; the mass fraction of Fe2O3 is independently ≤0.6%, preferably 0.1% to 0.5%, and more preferably 0.2% to 0.4%; the total mass fraction of Na2O and K2O is independently ≤0.5%, preferably 0.1% to 0.4%, and more preferably 0.2% to 0.3%.

[0041] The mass fraction of SiO2 in the waste silica brick particles and waste silica brick fine powder is independently ≥97%, preferably 98% to 99.5%, and more preferably 98.5% to 99%; the mass fraction of Fe2O3 is independently ≤1.5%, preferably 0.2% to 1.3%, and more preferably 0.5% to 1.0%; the total mass fraction of Na2O and K2O is independently ≤1.5%, preferably 0.2% to 1.3%, and more preferably 0.2% to 1.0%.

[0042] The substances in the coke gemstone particles are measured by mass percentage, wherein the content of Al2O3 is 40-47%, preferably 42-46%, and more preferably 45%; the content of SiO2 is 47-59%, preferably 48-55%, and more preferably 52%; the content of Fe2O3 is 0.2-1.5%, preferably 0.5-1.2%, and more preferably 0.8-1.0%; the total content of Na2O and K2O is 0.1-0.2%, preferably 0.1-0.16%, and more preferably 0.1-0.13%.

[0043] In the present invention, the mass percentage of Al2O3 in the ball clay fine powder is 30-35%, preferably 31-34%, and more preferably 32-33%; the mass percentage of Fe2O3 is 1.5-2%, preferably 1.5-1.9%, and more preferably 1.5-1.8%; the refractoriness of the ball clay fine powder is ≥1700°C, preferably 1700-1800°C, and more preferably 1710-1720°C; the plasticity index is 20-32, preferably 23-30, and more preferably 25-28.

[0044] The mass fraction of SiO2 in the silicon micropowder is ≥93.0%, preferably 93.5% to 96%, and more preferably 94.0% to 95.0%; the total mass fraction of Na2O and K2O is ≤0.6%, preferably 0.1% to 0.5%, and more preferably 0.2% to 0.3%.

[0045] The mass fraction of the thermosetting phenolic resin is 3 to 6 parts, preferably 3.5 to 5.5 parts, more preferably 4 to 5 parts, and more preferably 4.3 to 4.7 parts; the viscosity of the thermosetting phenolic resin at 25°C is 16 to 19 Pa.s, preferably 17 to 18 Pa.s; the residual carbon content is ≥42%, preferably 45 to 60%, and more preferably 50 to 55%; the solid content is 78 to 83%, preferably 79 to 82%, and more preferably 80 to 81%; the moisture content is ≤3.0%, preferably 2.0 to 2.8%, and more preferably 2.2 to 2.6%; the pH value is 7.0 to 8.0, preferably 7.3 to 7.8, and more preferably 7.5.

[0046] The present invention also provides a method for preparing an outer layer material of a breathable skateboard brick, comprising the following steps:

[0047] 1) Grinding quartz stone powder, waste silica brick powder, silicon powder and ball clay powder into co-grinded powder by a ball mill; dry-mixing quartz stone particles, coke stone particles and waste silica brick particles in a mixer, adding thermosetting phenolic resin and mixing to obtain mixed aggregate;

[0048] 2) The co-ground powder obtained in step 1) and the mixed aggregate are mixed and ground to obtain the outer layer material of the breathable skateboard brick.

[0049] In the present invention, the time for preparing the co-milled powder by the ball mill in step 1) is 30 to 60 min, preferably 30 to 55 min, more preferably 32 to 47 min, and more preferably 37 to 43 min; the rotation speed of the ball mill barrel during the ball milling process is 15 to 25 r / min, preferably 17 to 23 r / min, and more preferably 19 to 20 r / min.

[0050] In the present invention, the dry mixing time of the aggregate in step 1) is 3 to 7 minutes, preferably 4 to 6 minutes, and more preferably 5 minutes; the speed of the mixer during the dry mixing process is 35 to 50 r / min, preferably 38 to 48.r / min, and more preferably 42 to 45 r / min;

[0051] The mixing and grinding time is 5 to 8 minutes, preferably 6 to 7 minutes; the rotation speed of the mixer during the mixing and grinding process is 35 to 50 r / min, preferably 38 to 48.r / min, and more preferably 42 to 45 r / min.

[0052] In the present invention, the mixing time after adding the resin in step 2) is 25 to 35 minutes, preferably 27 to 32 minutes, and more preferably 29 to 31 minutes; the speed of the mixer during the mixing process is 35 to 50 r / min, preferably 38 to 48.r / min, and more preferably 42 to 45 r / min.

[0053] The outer layer material of the air-permeable slide brick obtained in step 2) of the present invention is trapped for 5 to 8 hours and then molded and dried with any aluminum-carbon air-permeable slide brick inner material (Al2O3≥90%, C≤3%, SiO2≤2%) to obtain a finished air-permeable slide brick.

[0054] The drying step is preferably:

[0055] 1) raising the temperature from room temperature to 50° C. and drying for 2 to 4 hours, preferably drying for 2.5 to 3.8 hours, and more preferably drying for 3 to 3.5 hours;

[0056] 2) drying at a temperature of 50 to 115° C. for 4 to 6 hours; the drying time is preferably 4.5 to 5.5 hours, more preferably 5 hours;

[0057] 3) raising the temperature to 115-150° C. and drying for 4-6 hours; the drying time is preferably 4.5-5.5 hours, more preferably 5 hours;

[0058] 4) raising the temperature to 150-220° C. and baking for 4-6 hours; the drying time is preferably 4.5-5.5 hours, more preferably 5 hours;

[0059] 5) raising the temperature to 220° C. and maintaining the temperature for 8 to 12 hours; the maintaining time is preferably 9 to 11 hours, more preferably 9.5 to 10.5 hours, and more preferably 10 hours;

[0060] 6) Cooling to room temperature to complete drying to obtain a skateboard brick that can be used in the steel smelting process.

[0061] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0062] Example 1

[0063] Accurately weigh the following raw materials in mass fractions: 30 parts of quartz particles, wherein the mass ratio of quartz particles of different particle sizes is 5-3mm: 3-1mm: 1-0mm = 7:15:8, quartz particles of 5-3mm include 5mm but not 3mm, quartz particles of 3-1mm include 3mm but not 1mm, quartz particles of 1-0mm include 1mm but not 0mm, wherein the mass fraction of SiO2 is 99.28%, the mass fraction of Fe2O3 is 0.33%, and the total mass fraction of Na2O and K2O is 0. 39%; 24 parts of waste silica brick particles, of which the mass ratio of waste silica brick particles of different particle sizes is 3-1mm:1-0mm=15:9, 3-1mm waste silica brick particles include 3mm, excluding 1mm, 1-0mm waste silica brick particles include 1mm, excluding 0mm, of which the mass fraction of SiO2 is 98.5%, the mass fraction of Fe2O3 is 0.9%, and the total mass fraction of Na2O and K2O is 0.6%; 10 parts of pyroxene particles with a particle size of 1-0mm, of which the content of Al2O3 is 47.1%, Si O2 content is 51.2%, Fe2O3 content is 1.5%, Na2O and K2O total content is 0.2%; 19 parts of quartz stone fine powder with a particle size of 240 mesh, in which the mass fraction of SiO2 is 99.28%, the mass fraction of Fe2O3 is 0.33%, and the total mass fraction of Na2O and K2O is 0.39%; 13 parts of waste silicon brick fine powder with a particle size of 240 mesh, in which the mass fraction of SiO2 is 98.5%, the mass fraction of Fe2O3 is 0.9%, and the total mass fraction of Na2O and K2O is 0.6%; 2 parts of silicon micropowder with a particle size of 1-3 μm, of which the mass fraction of SiO2 is 94.5%, and the total mass fraction of Na2O and K2O is 0.5%; 2 parts of ball clay fine powder with a particle size of 1-5 μm, of which the mass fraction of Al2O3 is 33.8%, the mass fraction of Fe2O3 is 2%, the refractoriness is 1760℃, and the plasticity index is 26; 4.3 parts of PF-5323 thermosetting phenolic resin, with a viscosity of 18.5 Pa.s, a residual carbon content of 43.8%, a solid content of 82%, a moisture content of 3.0%, and a pH value of 7.8. Prepare breathable skateboard bricks according to the following steps:

[0064] 1) Put quartz stone fine powder, waste silica brick fine powder, silicon powder and ball clay fine powder into a ball mill, and work for 40 minutes at a drum speed of 18 r / min to make co-ground powder; add quartz stone particles, waste silica brick particles and coke gem particles into a high-speed mixer, dry mix for 5 minutes at a speed of 45 r / min, then add PF-5323 thermosetting phenolic resin again and mix and grind for 6 minutes at a speed of 38 r / min to obtain a mixed aggregate.

[0065] 2) The co-ground powder obtained in step 1) is slowly added into the above-mentioned high-speed mixer and mixed with the mixed aggregate and the resin binder at a speed of 40 r / min for 31 minutes to obtain the outer layer material of the breathable skateboard brick.

[0066] 3) After the outer layer material of the breathable skateboard brick obtained in step 2) is trapped for 5 hours, it is composited with the aluminum-carbon breathable skateboard inner material (wherein Al2O3=95.8%, C=2.3%, SiO2=0.6%) and formed using a 630-ton electric screw press. After pressing and forming, it is placed in a drying kiln and dried at 50°C for 3 hours, heated to 115°C and dried for 4 hours, heated to 150°C and dried for 6 hours, heated to 210°C again and baked for 4 hours, and finally heated to 220°C for insulation treatment for 12 hours, and the temperature is lowered to room temperature to complete drying, thereby obtaining a breathable skateboard brick containing the outer layer material of the breathable skateboard brick described in the present invention.

[0067] Example 2

[0068] Accurately weigh the following raw materials in parts by mass: 30 parts of quartz particles, wherein the mass ratio of quartz particles of different particle sizes is 5-3mm: 3-1mm: 1-0mm = 5:16:9, quartz particles of 5-3mm include 5mm but not 3mm, quartz particles of 3-1mm include 3mm but not 1mm, quartz particles of 1-0mm include 1mm but not 0mm, wherein the mass fraction of SiO2 is 99.5%, the mass fraction of Fe2O3 is 0.35%, the total mass fraction of Na2O and K2O is 0.1 5%; 24 parts of waste silica brick particles, of which the mass ratio of waste silica brick particles of different particle sizes is 3-1mm:1-0mm=14:10, 3-1mm waste silica brick particles include 3mm, excluding 1mm, 1-0mm waste silica brick particles include 1mm, excluding 0mm, of which the mass fraction of SiO2 is 99.5%, the mass fraction of Fe2O3 is 0.3%, and the total mass fraction of Na2O and K2O is 0.2%; 10 parts of pyroxene particles with a particle size of 1-0mm, of which the content of Al2O3 is 45.3%, SiO 2 content is 53.2%, Fe2O3 content is 1.3%, and the total content of Na2O and K2O is 0.2%; 16 parts of quartz stone fine powder with a particle size of 320 mesh, in which the mass fraction of SiO2 is 99.3%, the mass fraction of Fe2O3 is 0.4%, and the total mass fraction of Na2O and K2O is 0.3%; 15 parts of waste silica brick fine powder with a particle size of 320 mesh, in which the mass fraction of SiO2 is 99.0%, the mass fraction of Fe2O3 is 0.7%, and the total mass fraction of Na2O and K2O is 0.3%; particle size is 1 2 parts of silicon micropowder with a particle size of 1-3μm, of which the mass fraction of SiO2 is 95.0%, and the total mass fraction of Na2O and K2O is 0.2%; 3 parts of ball clay fine powder with a particle size of 1-5μm, of which the mass fraction of Al2O3 is 30-35%, the mass fraction of Fe2O3 is 1.5-2%, the refractoriness is 1700℃, and the plasticity index is 32; 4.5 parts of PF-5323 thermosetting phenolic resin, with a viscosity of 17Pa.s, a residual carbon content of 42.3%, a solid content of 79.5%, a moisture content of 2.8%, and a pH value of 8.0. Prepare breathable skateboard bricks according to the following steps:

[0069] 1) Put quartz stone fine powder, waste silica brick fine powder, silicon powder and ball clay fine powder into a ball mill, and work for 60 minutes at a drum speed of 18r / min to make co-grinded powder; add quartz stone particles, waste silica brick particles and coke gem particles into a high-speed mixer, dry mix for 6 minutes at a speed of 45r / min, then add PF-5323 thermosetting phenolic resin again and mix at a speed of 48r / min for 7 minutes to obtain a mixed aggregate.

[0070] 2) The co-ground powder obtained in step 1) is slowly added into the above-mentioned high-speed mixer and mixed with the mixed aggregate and the resin binder at a speed of 38 r / min for 33 minutes to obtain the outer layer material of the breathable skateboard brick.

[0071] 3) The outer layer material of the breathable skateboard brick obtained in step 2) is trapped for 6 hours, and then composited with the aluminum-carbon breathable skateboard inner material (wherein Al2O3=95.8%, C=2.3%, SiO2=0.6%), and formed using a 630-ton electric press. After pressing and forming, it is placed in a drying kiln and dried at 50°C for 4 hours, heated to 70°C and dried for 6 hours, heated to 120°C and dried for 5.5 hours, heated to 160°C again and baked for 6 hours, and finally heated to 220°C for insulation treatment for 8 hours, and the temperature is lowered to room temperature to complete drying, thereby obtaining a breathable skateboard brick containing the outer layer material of the breathable skateboard brick described in the present invention.

[0072] Example 3

[0073] Accurately weigh the following raw materials in parts by mass: 28 parts of quartz particles, wherein the mass ratio of quartz particles of different particle sizes is 5-3mm: 3-1mm: 1-0mm = 5:14:9, quartz particles of 5-3mm include 5mm but not 3mm, quartz particles of 3-1mm include 3mm but not 1mm, quartz particles of 1-0mm include 1mm but not 0mm, wherein the mass fraction of SiO2 is 99.3%, the mass fraction of Fe2O3 is 0.48%, and the total mass fraction of Na2O and K2O is 0 .22%; 27 parts of waste silica brick particles, of which the mass ratio of waste silica brick particles of different particle sizes is 3-1mm:1-0mm=17:10, 3-1mm waste silica brick particles include 3mm, excluding 1mm, 1-0mm waste silica brick particles include 1mm, excluding 0mm, of which the mass fraction of SiO2 is 98.8%, the mass fraction of Fe2O3 is 0.7%, and the total mass fraction of Na2O and K2O is 0.5%; 10 parts of pyroxene particles with a particle size of 1-0mm, of which the content of Al2O3 is 44.0% , SiO2 content is 55.0%, Fe2O3 content is 0.9%, Na2O and K2O total content is 0.1%; 15 parts of quartz stone fine powder with a particle size of 220 mesh, of which the mass fraction of SiO2 is 99.6%, the mass fraction of Fe2O3 is 0.3%, and the total mass fraction of Na2O and K2O is 0.1%; 15 parts of waste silica brick fine powder with a particle size of 200 mesh, of which the mass fraction of SiO2 is 99.2%, the mass fraction of Fe2O3 is 0.4%, and the total mass fraction of Na2O and K2O is 0.4% ; 3 parts of silicon micropowder with a particle size of 1 to 3 μm, of which the mass fraction of SiO2 is 96%, and the total mass fraction of Na2O and K2O is 0.2%; 2 parts of ball clay fine powder with a particle size of 1 to 5 μm, of which the mass fraction of Al2O3 is 32%, the mass fraction of Fe2O3 is 1.5%, the refractoriness is 1780℃, and the plasticity index is 28; 4.8 parts of PF-5323 thermosetting phenolic resin, with a viscosity of 19 Pa.s, a residual carbon content of 44.5%, a solid content of 81.6%, a moisture content of 2.5%, and a pH value of 7.0. Prepare breathable skateboard bricks according to the following steps:

[0074] 1) Put quartz stone fine powder, waste silica brick fine powder, silicon powder and ball clay fine powder into a ball mill, and work for 30 minutes at a drum speed of 23r / min to make co-ground powder; add quartz stone particles, waste silica brick particles, coke gem particles and resin binder into a high-speed mixer, dry mix for 7 minutes at a speed of 45r / min, then add PF-5323 thermosetting phenolic resin again and mix and grind for 8 minutes at a speed of 42r / min to obtain a mixed aggregate.

[0075] 2) The co-ground powder obtained in step 1) is slowly added into the high-speed mixer and mixed with the mixed aggregate and the resin binder at a speed of 50 r / min for 35 minutes to obtain the outer layer material of the breathable skateboard brick.

[0076] 3) After the outer layer material of the breathable skateboard brick obtained in step 2) is trapped for 7 hours, it is composited with the aluminum-carbon breathable skateboard inner material (wherein Al2O3=95.8%, C=2.3%, SiO2=0.6%) and formed using a 630-ton electric press. After pressing and forming, it is placed in a drying kiln and dried at 50°C for 2 hours, heated to 80°C and dried for 5 hours, heated to 150°C and dried for 4 hours, heated to 200°C again and baked for 5 hours, and finally heated to 220°C for insulation treatment for 8 hours, and the temperature is lowered to room temperature to complete drying, thereby obtaining a breathable skateboard brick containing the outer layer material of the breathable skateboard brick described in the present invention.

[0077] Example 4

[0078] Accurately weigh the following raw materials in parts by mass: 28 parts of quartz particles, wherein the mass ratio of quartz particles of different particle sizes is 5-3mm: 3-1mm: 1-0mm = 4:17:7, quartz particles of 5-3mm include 5mm but not 3mm, quartz particles of 3-1mm include 3mm but not 1mm, quartz particles of 1-0mm include 1mm but not 0mm, wherein the mass fraction of SiO2 is 99.6%, the mass fraction of Fe2O3 is 0.28%, and the total mass fraction of Na2O and K2O is 0 .12%; 24 parts of waste silica brick particles, of which the mass ratio of waste silica brick particles of different particle sizes is 3-1mm:1-0mm=19:5, 3-1mm waste silica brick particles include 3mm, excluding 1mm, 1-0mm waste silica brick particles include 1mm, excluding 0mm, of which the mass fraction of SiO2 is 99.3%, the mass fraction of Fe2O3 is 0.45%, and the total mass fraction of Na2O and K2O is 0.25%; 9 parts of pyroxene quartz particles with a particle size of 1-0mm, of which the content of Al2O3 is 43.6% , SiO2 content is 55.0%, Fe2O3 content is 1.3%, Na2O and K2O total content is 0.1%; 19 parts of quartz stone fine powder with a particle size of 280 mesh, of which the mass fraction of SiO2 is 99.6%, the mass fraction of Fe2O3 is 0.3%, and the total mass fraction of Na2O and K2O is 0.1%; 16 parts of waste silica brick fine powder with a particle size of 180 mesh, of which the mass fraction of SiO2 is 99.2%, the mass fraction of Fe2O3 is 0.4%, and the total mass fraction of Na2O and K2O is 0.4% ; 1 part of silicon micropowder with a particle size of 1 to 3 μm, in which the mass fraction of SiO2 is 94.8%, and the total mass fraction of Na2O and K2O is 0.2%; 3 parts of ball clay fine powder with a particle size of 1 to 5 μm, in which the mass fraction of Al2O3 is 33%, the mass fraction of Fe2O3 is 1.3%, the refractoriness is 1700℃, and the plasticity index is 27; 3 parts of PF-5323 thermosetting phenolic resin, with a viscosity of 19 Pa.s, a residual carbon content of 45.5%, a solid content of 80.5%, a moisture content of 2.5%, and a pH value of 7.0. Prepare breathable skateboard bricks according to the following steps:

[0079] 1) Put quartz stone fine powder, waste silica brick fine powder, silicon powder and ball clay fine powder into a ball mill, and work for 45 minutes at a drum speed of 20r / min to make co-ground powder; add quartz stone particles, waste silica brick particles and coke gem particles into a high-speed mixer, dry mix for 4 minutes at a speed of 48r / min, then add PF-5323 thermosetting phenolic resin again and mix and grind for 5 minutes at a speed of 42r / min to obtain a mixed aggregate.

[0080] 2) The co-ground powder obtained in step 1) is slowly added into the above-mentioned high-speed mixer and mixed with the mixed aggregate and the resin binder at a rotation speed of 35 r / min for 25 minutes to obtain the outer layer material of the breathable skateboard brick.

[0081] 3) After the outer layer material of the breathable skateboard brick obtained in step 2) is trapped for 5 hours, it is composited with the aluminum-carbon breathable skateboard inner material (wherein Al2O3=95.8%, C=2.3%, SiO2=0.6%) and formed using a 630-ton electric press. After pressing and forming, it is placed in a drying kiln and dried at 50°C for 2 hours, heated to 55°C and dried for 6 hours, heated to 115°C and dried for 6 hours, heated to 220°C again and baked for 5 hours, and finally heated to 220°C for insulation treatment for 8 hours, and the temperature is lowered to room temperature to complete drying, thereby obtaining a breathable skateboard brick containing the outer layer material of the breathable skateboard brick described in the present invention.

[0082] Example 5

[0083] Accurately weigh the following raw materials in parts by mass: 33 parts of quartz particles, wherein the mass ratio of quartz particles of different particle sizes is 5-3mm: 3-1mm: 1-0mm = 9:12:12, quartz particles of 5-3mm include 5mm but not 3mm, quartz particles of 3-1mm include 3mm but not 1mm, quartz particles of 1-0mm include 1mm but not 0mm, wherein the mass fraction of SiO2 is 99.8%, the mass fraction of Fe2O3 is 0.1%, and the total mass fraction of Na2O and K2O is 0 .1%; 27 parts of waste silica brick particles, of which the mass ratio of waste silica brick particles of different particle sizes is 3-1mm:1-0mm=12:15, 3-1mm waste silica brick particles include 3mm, excluding 1mm, 1-0mm waste silica brick particles include 1mm, excluding 0mm, of which the mass fraction of SiO2 is 99.27%, the mass fraction of Fe2O3 is 0.35%, and the total mass fraction of Na2O and K2O is 0.38%; 5 parts of pyroxene particles with a particle size of 1-0mm, of which the content of Al2O3 is 43.6 %, SiO2 content is 55.0%, Fe2O3 content is 1.3%, and the total content of Na2O and K2O is 0.1%; 22 parts of quartz stone fine powder with a particle size of 280 mesh, in which the mass fraction of SiO2 is 99.4%, the mass fraction of Fe2O3 is 0.6%, and the total mass fraction of Na2O and K2O is 0.4%; 9 parts of waste silicon brick fine powder with a particle size of 240 mesh, in which the mass fraction of SiO2 is 99.3%, the mass fraction of Fe2O3 is 0.45%, and the total mass fraction of Na2O and K2O is 0. 25%; 3 parts of silicon micropowder with a particle size of 1-3μm, of which the mass fraction of SiO2 is 95.8%, and the total mass fraction of Na2O and K2O is 0.2%; 1 part of ball clay fine powder with a particle size of 1-5μm, of which the mass fraction of Al2O3 is 35%, the mass fraction of Fe2O3 is 0.2%, the refractoriness is 1830℃, and the plasticity index is 29; 6 parts of PF-5323 thermosetting phenolic resin, with a viscosity of 19Pa.s, a residual carbon content of 42.5, a solid content of 79.5%, a moisture content of 2%, and a pH value of 8.0. Prepare breathable skateboard bricks according to the following steps.

[0084] 1) Put quartz stone fine powder, waste silica brick fine powder, silicon powder and ball clay fine powder into a ball mill, and work for 50 minutes at a drum speed of 25r / min to make co-ground powder; add quartz stone particles, waste silica brick particles and coke gem particles into a high-speed mixer, dry mix for 3 minutes at a speed of 42r / min, then add PF-5323 thermosetting phenolic resin again and mix and grind for 8 minutes at a speed of 42r / min to obtain a mixed aggregate.

[0085] 2) The mixed powder obtained in step 1) is slowly added into the above-mentioned high-speed mixer and milled together with the mixed aggregate at a rotation speed of 35 r / min for 28 minutes to obtain the outer layer material of the breathable skateboard brick.

[0086] 3) After the outer layer material of the breathable skateboard brick obtained in step 2) is trapped for 7 hours, it is composited with the aluminum-carbon breathable skateboard inner material (wherein Al2O3=95.8%, C=2.3%, SiO2=0.6%) and formed using a 630-ton electric press. After pressing and forming, it is placed in a drying kiln and dried at 50°C for 2 hours, heated to 80°C and dried for 5 hours, heated to 145°C and dried for 4.5 hours, heated to 195°C again and baked for 5 hours, and finally heated to 220°C for insulation treatment for 8 hours, and the temperature is lowered to room temperature to complete drying, thereby obtaining a breathable skateboard brick containing the outer layer material of the breathable skateboard brick described in the present invention.

[0087] The performance test of the breathable skateboard brick outer layer material obtained in Examples 1 to 5 was carried out. The detection methods of bulk density and apparent porosity were referred to GB / T 2997-2000, the detection method of compressive strength was referred to GB / T507-2008, and the detection method of skateboard product line change rate was referred to GB / T5988-2022. The service life of the breathable skateboard brick prepared in Examples 1 to 5 containing the breathable skateboard brick outer layer material of the present invention was tested. The test results are shown in Table 1.

[0088] Table 1 Physical property test results of the air-permeable slide bricks containing outer layer materials prepared in Examples 1 to 5

[0089]

[0090] As shown in Table 1, the main physical and chemical indicators of the outer layer material of the air-permeable skateboard brick prepared by the present invention are as follows: SiO2 ≥ 92%, the volume density of the outer layer only after baking at 220°C ≥ 1.80 g / cm 3 , the apparent porosity of inner and outer layer skateboard bricks (200℃×24h) 8~13%, the compressive strength of inner and outer layer skateboard bricks (200℃×24h) ≥80MPa, the linear change rate of inner and outer layer skateboard bricks (1300℃×3h) 0~0.3%. The breathable skateboard bricks prepared as the outer layer material and inner material of the breathable skateboard brick can be used 4~5 times in the steel smelting process.

[0091] 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 and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A breathable skateboard brick outer layer material, characterized in that: The invention comprises the following raw materials in parts by mass: 15-33 parts of quartz stone particles, 5-15 parts of coke gemstone particles, 20-30 parts of waste silica brick particles, 15-25 parts of quartz stone fine powder, 8-18 parts of waste silica brick fine powder, 1-3 parts of silicon micropowder, 0.5-3.0 parts of ball clay fine powder and 3-6 parts of thermosetting phenolic resin.

2. The breathable skateboard brick outer layer material according to claim 1, characterized in that: The thermosetting phenolic resin is PF-5323 thermosetting phenolic resin.

3. The breathable skateboard brick outer layer material according to claim 2, characterized in that: The particle size of the quartz particles is 0-5 mm, wherein the mass ratio of 5-3 mm: 3-1 mm: 1-0 mm is 4-9: 12-20: 7-12, 5-3 mm quartz particles include 5 mm but not 3 mm, 3-1 mm quartz particles include 3 mm but not 1 mm, and 1-0 mm quartz particles include 1 mm but not 0 mm; The particle size of the waste silicon brick particles is 0-3 mm, wherein the mass ratio of 3-1 mm:1-0 mm is 12-22:5-15, 3-1 mm waste silicon brick particles include 3 mm but not 1 mm, and 1-0 mm waste silicon brick particles include 1 mm but not 0 mm; The particle size of the coke gemstone particles is 1-0 mm; the particle size of the quartz stone fine powder is 200-320 mesh; the particle size of the waste silicon brick fine powder is 180-240 mesh; the particle size of the silicon micropowder is 1-3 μm; and the particle size of the ball clay fine powder is 1-5 μm.

4. The breathable skateboard brick outer layer material according to any one of claims 1 to 3, characterized in that: The mass fraction of SiO2 in the quartz particles and quartz fine powder is independently ≥97%, the mass fraction of Fe2O3 is independently ≤0.6%, and the total mass fraction of Na2O and K2O is independently ≤0.5%; The mass fraction of SiO2 in the waste silicon brick particles and waste silicon brick fine powder is independently ≥97%, the mass fraction of Fe2O3 is independently ≤0.9%, and the total mass fraction of Na2O and K2O is independently ≤0.7%; The substances in the coke gemstone particles are calculated by mass percentage, wherein the content of Al2O3 is 43-47%, the content of SiO2 is 47-57%, the content of Fe2O3 is 0.2-1.5%, and the total content of Na2O and K2O is 0.1-0.2%; The mass fraction of Al2O3 in the ball clay fine powder is 30-35%, and the mass fraction of Fe2O3 is 1.0-1.6%; the refractoriness of the ball clay fine powder is ≥1700°C, and the plasticity index is 20-32; The mass fraction of SiO2 in the silicon micropowder is ≥93.0%, and the total mass fraction of Na2O and K2O is ≤0.6%; The thermosetting phenolic resin has a viscosity of 16-19 Pa.s at 25° C., a residual carbon content of ≥42%, a solid content of 78-83%, a moisture content of ≤3.0%, and a pH value of 7.0-8.

0.

5. The method for preparing the outer layer material of a breathable skateboard brick according to any one of claims 1 to 4, characterized in that: The following steps are involved: 1) ball-milling quartz stone fine powder, waste silica brick fine powder, silica powder and ball clay fine powder to obtain co-grinding powder; dry-mixing quartz stone particles, coke gem particles and waste silica brick particles, adding thermosetting phenolic resin and mixing and grinding to obtain mixed aggregate; 2) The co-ground powder obtained in step 1) and the mixed aggregate are mixed and ground to obtain the outer layer material of the breathable skateboard brick.

6. The method for preparing the outer layer material of a breathable skateboard brick according to claim 5, characterized in that: The ball milling time in step 1) is 30-60 min, and the rotation speed is 15-25 r / min.

7. The method for preparing the outer layer material of a breathable skateboard brick according to claim 5 or 6, characterized in that: The dry mixing time in step 1) is 3-8 minutes and the rotation speed is 35-50 r / min; The mixing and grinding time is 5-8 minutes, and the rotation speed is 35-50 r / min.

8. The method for preparing the outer layer material of a breathable skateboard brick according to claim 7, characterized in that: The mixing and grinding time in step 2) is 25-35 minutes, and the rotation speed is 35-50 r / min.

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