Mineral wool fiber board and method of preparing same

Abstract

The present application provides a mineral wool fiber board and a method of preparing same, and belongs to the technical field of mineral wool fibers. The method of preparing the mineral wool fiber board provided in the present application comprises the following steps: providing mineral wool fibers, the materials for preparing said mineral wool fibers comprising basalt, steel slag, dolomite, and mineral wool solid waste; crushing, carding, and dispersing the mineral wool fibers, wherein water, a water repellent, and a flame retardant are added during the crushing process, thus obtaining mineral wool staple fibers; uniformly mixing the mineral wool staple fibers with an adhesive, uniformly spreading, and then performing pre-molding under the introduction of steam, thus obtaining a pre-formed board; and hot pressing the pre-formed board to obtain mineral wool fiber board, the mass percentage content of the adhesive in the mineral wool fiber board being 8-14%. The mineral wool fiber board provided in the present application is high-strength and has good fire resistance, water resistance, weather resistance, and air permeability.

Description

A rock wool fiberboard and its preparation method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 23, 2023, with application number 202311573277.9 and invention name “A rock wool fiberboard and its preparation method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of rock wool fiber technology, and in particular to a rock wool fiberboard and a preparation method thereof. Background Art

[0003] With the acceleration of urbanization, the construction industry has been booming, and the demand for decorative board materials for the interior and exterior walls of buildings has increased dramatically. At present, the existing building boards are divided into wood plastic boards, flame retardant boards, cement boards, etc.

[0004] Wood-plastic panels are made of a composite of plastic and wood fiber. For example, patent CN 110845808 A discloses a low-shrinkage, heat-resistant PVC wood-plastic decorative panel and its preparation method. However, wood-plastic panels suffer from low strength and poor fire resistance.

[0005] Flame-retardant boards, which include flame-retardant density boards and flame-retardant plywood, are manufactured by adding flame retardants to the board production line during the wood-based panel production process. While flame-retardant boards offer excellent flame retardancy, their wood-based base material still suffers from low strength and poor weather resistance.

[0006] Cement board, as the name suggests, is a type of building flat panel made primarily from cement, a material intermediate between gypsum board and stone. While cement board offers good strength and flame retardancy, it also suffers from poor air permeability and the tendency to warp.

[0007] Therefore, there is an urgent need for an interior and exterior wall decorative panel with excellent comprehensive performance to meet the requirements of the construction industry for strength, fire resistance and air permeability.

[0008] Summary of the Invention

[0009] In view of this, the purpose of this application is to provide a rock wool fiberboard and a preparation method thereof. The rock wool fiberboard provided in this application has high strength and good fire resistance, waterproofness, weather resistance and air permeability.

[0010] In order to achieve the above objectives, this application provides the following technical solutions:

[0011] The present application provides a method for preparing a rock wool fiberboard, comprising the following steps:

[0012] Providing rock wool fibers, wherein the raw materials for preparing the rock wool fibers include basalt, steel slag, dolomite and rock wool solid waste;

[0013] The rock wool fibers are crushed, combed, and dispersed, and water, a water repellent, and a flame retardant are added during the crushing process to obtain rock wool fiber staples;

[0014] The rock wool fiber staple fibers are uniformly mixed with the adhesive, uniformly laid, and preformed under steam conditions to obtain a preformed board;

[0015] hot pressing the preformed board to obtain a rock wool fiberboard;

[0016] The mass percentage of the adhesive in the rock wool fiberboard is 8-14%.

[0017] Preferably, the method for preparing the rock wool fiber comprises the following steps:

[0018] (1) Provide the following percentage by mass of rock wool raw materials:

[0019] The particle size of the rock wool raw material is 0.5 to 30 mm;

[0020] (2) mixing the rock wool raw materials and melting them in an electric furnace to obtain rock wool slurry;

[0021] (3) The rock wool slurry is subjected to centrifugal fiberization and cotton collection to obtain rock wool fibers.

[0022] Preferably, the melting temperature of the electric furnace is 1600-1700°C.

[0023] Preferably, the method for preparing the rock wool fiber comprises the following steps:

[0024] ① Provide the following percentages of rock wool raw materials:

[0025] Basalt 40-47%, particle size 8-16 cm;

[0026] Iron and steel slag 0-14%, particle size 3-8cm;

[0027] Dolomite 5-11%, particle size 4-8 cm;

[0028] 20-30% rock wool solid waste blocks, wherein the rock wool solid waste blocks are obtained by pressing rock wool solid waste and Portland cement, and have a particle size of 8-16 cm;

[0029] Coke 13-16%, particle size 8-16cm;

[0030] ② sending the rock wool raw material to a cupola for blast combustion to obtain rock wool slurry;

[0031] ③ The rock wool slurry is subjected to centrifugal fiberization and cotton collection to obtain rock wool fibers.

[0032] Preferably, the temperature of the blast combustion is 1500-1600°C.

[0033] Preferably, the centrifugal speed is 5800-7600 rpm;

[0034] The diameter of the rock wool fiber is 4 to 7 μm.

[0035] Preferably, during the pulverization process, the amount of water added is 3 to 10% of the mass of the rock wool fiber;

[0036] The mass of the water repellent is 0.3 to 8% of the mass of the rock wool fiber;

[0037] The mass of the flame retardant is 1-8% of the mass of the rock wool fiber.

[0038] Preferably, the core temperature of the preformed board is 80-120°C;

[0039] The hot pressing temperature is 220-270°C and the pressure is 2-7 N / mm 2 The heat preservation and pressure holding time is 270 to 420 seconds.

[0040] The present application provides a rock wool fiberboard prepared by the above preparation method, wherein the organic matter content of the rock wool fiberboard is 8 to 14 wt%.

[0041] Preferably, the rock wool fiberboard has a thickness of 3 mm to 2.5 cm and a density of 150 to 1400 kg / m 3 .

[0042] This application provides a method for preparing a rock wool fiberboard, comprising the following steps: providing rock wool fibers, wherein the raw materials for preparing the rock wool fibers include basalt, steel slag, dolomite, and rock wool solid waste; pulverizing the rock wool fibers, adding water, a hydrophobic agent, and a flame retardant during the pulverization process to obtain rock wool fiber staples; mixing the rock wool fiber staples with an adhesive and hot pressing them to obtain a rock wool fiberboard; the weight percentage of the adhesive in the rock wool fiberboard is 8-14%. This application uses basalt, steel slag, dolomite, and rock wool solid waste as raw materials, wherein the main components of steel slag include SiO2, Al2O3, MgO, CaO, Fe2O3, and TiO2, which can change the fiber composition, lower the melting point, and increase the strength of the rock wool fiber; the main components of dolomite include SiO2, CaO, and MgO, which can reduce the melt viscosity, making the fluid easier to flow and easier to fiberize. The present application adds rock wool solid waste to the fiber raw material. The rock wool solid waste is the leftover material for producing rock wool fiberboard. On the one hand, it can realize the resource recycling of solid waste and save costs. On the other hand, it has a low melting temperature and can promote fiberization. The rock wool fiberboard provided by the present application is pressed from rock wool fibers and has excellent static bending strength and elastic modulus. Its static bending strength is ≥27MPa and its elastic modulus is ≥4000MPa. Since the rock wool fibers are filamentous, the density of the pressed rock wool fiberboard is controllable and has good air permeability. Its water vapor permeability (23°C, 85% humidity) is ≤3.5. Since the present application adds a hydrophobic agent during the preparation process, the obtained rock wool fiberboard has good waterproof performance. Rock wool fiber is an inorganic material and has good fire resistance. The present application adds a low content of adhesive during the pressing process to control the organic content of the rock wool fiberboard to 8-14%, which can greatly improve the fire resistance. Its fire resistance level is as high as A2. At the same time, the rock wool fiberboard provided by the present application has good weather resistance, and its thermal expansion coefficient is ≤11.5×10 -3 mm / m·K, and a moisture expansion coefficient (after 4 days) of ≤0.302 mm / m. Furthermore, the rock wool fiberboard provided herein has excellent thermal insulation performance, with a thermal conductivity of ≤0.4 mm / m·K. In summary, the rock wool fiberboard provided herein has excellent overall performance and can meet the requirements for use as a building decorative board.

[0043] Furthermore, the present application adopts electric furnace melting or cupola combustion to prepare rock wool fibers, and the obtained rock wool fibers have good strength.

[0044] The preparation method provided by the present application is simple, low-cost, and suitable for industrial mass production. The rock wool fiberboard obtained by the present application has a light color and is easy to be subsequently painted as a decorative board, and the surface layer can be hot-pressed with melamine paper and hot-applied with PP film as a decorative fireproof board. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a physical picture of the rock wool fiberboard obtained in Example 1. DETAILED DESCRIPTION

[0046] The present application provides a method for preparing a rock wool fiberboard, comprising the following steps:

[0047] Providing rock wool fibers, wherein the raw materials for preparing the rock wool fibers include basalt, steel slag, dolomite and rock wool solid waste;

[0048] The rock wool fibers are crushed, combed, and dispersed, and water, a water repellent, and a flame retardant are added during the crushing process to obtain rock wool fiber staples;

[0049] The rock wool fiber staple fibers are uniformly mixed with the adhesive, uniformly laid, and preformed under steam conditions to obtain a preformed board;

[0050] hot pressing the preformed board to obtain a rock wool fiberboard;

[0051] The mass percentage of the adhesive in the rock wool fiberboard is 8-14%.

[0052] In the present application, the preparation method of the rock wool fiber is preferably an electric furnace melting method, which specifically includes the following steps:

[0053] (1) Provide the following percentage by mass of rock wool raw materials:

[0054] The particle size of the rock wool raw material is 0.5 to 30 mm;

[0055] (2) mixing the rock wool raw materials and melting them in an electric furnace to obtain rock wool slurry;

[0056] (3) The rock wool slurry is subjected to centrifugal fiberization and cotton collection to obtain rock wool fibers.

[0057] In this application, the rock wool raw material used in this application comprises 43-55% basalt, preferably 45-50%, by mass percentage. The basalt components in this application include SiO2, Al2O3, CaO, MgO, Fe2O3, Na2O, K2O, FeO, and TiO2. The basalt particle size in this application is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm.

[0058] In terms of percentage by mass, the rock wool raw material used in this application includes 25-44% steel slag, preferably 30-40%, and more preferably 35%. In this application, the steel slag is preferably sourced from a steel mill, and the main components of the steel slag include SiO2, Al2O3, MgO, CaO, Fe2O3, and TiO2. In this application, the particle size of the steel slag is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm. In this application, the steel slag serves to change the fiber composition, lower the melting point, and increase the strength of the rock wool fiber.

[0059] The rock wool raw material used in this application comprises 5-10% dolomite, preferably 6-8%, by weight. In this application, the dolomite comprises SiO2, CaO, and MgO. The particle size of the dolomite is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm. In this application, the dolomite serves to reduce melt viscosity, allowing the fluid to flow more easily and facilitate fiber formation.

[0060] In terms of percentage by mass, the rock wool raw materials used in this application include 4-13% rock wool solid waste, preferably 10%. In this application, the source of the rock wool solid waste is preferably scraps from the production of rock wool boards, or waste slag and waste cotton generated during the production process. This application has no special requirements for the production method, and can use rock wool waste from the production line of this application or waste from conventional rock wool board production lines. In this application, the particle size of the rock wool solid waste is preferably 0.5-30 mm, more preferably 1-20 mm, and even more preferably 5-10 mm.

[0061] In the present application, the rock wool raw materials are mixed and melted in an electric furnace to obtain rock wool slurry. In the present application, the mixing preferably includes the following steps:

[0062] The rock wool raw materials are measured and dried, and then enter the material hopper of the electric furnace for vibration mixing and feeding.

[0063] The present application heats and melts the rock wool raw material using electrodes in an electric furnace. In the present application, the melting temperature of the electric furnace is preferably 1600-1700°C, more preferably 1650°C. The present application has no particular requirements for the melting method of the electric furnace, as long as the rock wool raw material can be completely melted into magma.

[0064] The present application subjects the rock wool slurry to centrifugal fiberization and collection to obtain rock wool fibers. The present application preferably introduces the rock wool slurry into a centrifuge via a launder for centrifugal fiberization. In the present application, the centrifuge is preferably a four-roller centrifuge. In the present application, the centrifugation speed is preferably 5800 to 7600 rpm. The present application has no special requirements for the collection operation.

[0065] In the present application, the diameter of the rock wool fibers obtained after centrifugal fiberization and cotton collection is preferably 4 to 7 μm, more preferably 5 to 6 μm.

[0066] Alternatively, the rock wool fiber preparation method is a cupola combustion method, preferably comprising the following steps:

[0067] ① Provide the following percentages of rock wool raw materials:

[0068] Basalt 40-47%, particle size 8-16 cm;

[0069] Iron and steel slag 0-14%, particle size 3-8cm;

[0070] Dolomite 5-11%, particle size 4-8 cm;

[0071] 20-30% rock wool solid waste blocks, wherein the rock wool solid waste blocks are obtained by pressing rock wool solid waste and Portland cement, and have a particle size of 8-16 cm;

[0072] Coke 13-16%, particle size 8-16cm;

[0073] ② sending the rock wool raw material to a cupola for blast combustion to obtain rock wool slurry;

[0074] ③ The rock wool slurry is subjected to centrifugal fiberization and cotton collection to obtain rock wool fibers.

[0075] In this application, the rock wool raw material used in this application comprises 40-47% basalt, preferably 42-45%, by weight. The basalt composition in this application includes SiO2, Al2O3, CaO, MgO, Fe2O3, Na2O, K2O, FeO, and TiO2. The basalt particle size in this application is preferably 8-16 cm, more preferably 10-14 cm.

[0076] The rock wool raw material used in this application includes 0-14% steel slag, preferably 5-10%, by weight percentage. In this application, the steel slag is preferably sourced from a steel mill, and its main components include SiO2, Al2O3, MgO, CaO, Fe2O3, and TiO2. In this application, the particle size of the steel slag is preferably 3-8 cm, more preferably 5-7 cm. In this application, the steel slag serves to alter the fiber composition, lower the melting point, and increase the strength of the rock wool fibers.

[0077] The rock wool raw material used in this application comprises 5-11% dolomite by mass, preferably 7-10%. In this application, the dolomite comprises SiO2, CaO, and MgO. The particle size of the dolomite is preferably 4-8 cm, more preferably 5-6 cm. The dolomite reduces melt viscosity, allowing the fluid to flow more easily and facilitate fiber formation.

[0078] The rock wool raw material used in this application comprises 20-30% rock wool solid waste blocks, preferably 25%, by weight. In this application, the rock wool solid waste blocks are obtained by pressing rock wool solid waste with Portland cement. In the rock wool solid waste blocks, the Portland cement content is preferably 10-18%, more preferably 15%, and the rock wool solid waste content is preferably 85%. In this application, the diameter of the rock wool solid waste blocks is preferably 8-16 cm, more preferably 10-14 cm.

[0079] In this application, the source of the rock wool solid waste is preferably scraps from the production of rock wool boards, or waste slag and waste cotton generated during the production process. This application has no special requirements for the production method, and can use rock wool waste from the production line of this application or waste from conventional rock wool board production lines.

[0080] The rock wool raw material used in this application comprises 13-16% coke, preferably 14-15%, by weight. In this application, the diameter of the coke is preferably 8-16 cm, more preferably 10-14 cm. In this application, the coke serves as a combustion aid.

[0081] The present application delivers the rock wool raw material to a cupola for blast combustion to produce a rock wool slurry. The present application has no particular requirements for the blast temperature; either cold or hot air can be used. In the present application, during the blast process, the present application preferably injects oxygen into the cupola to promote the intermediate combustion of the raw material.

[0082] In the present application, the temperature of the blast combustion is preferably 1500-1600° C., more preferably 1550° C. The present application has no special requirements for the time of the blast combustion, as long as the rock wool raw material is transformed into magma.

[0083] The present application subjects the rock wool slurry to centrifugal fiberization and cotton collection to obtain rock wool fibers. In the present application, the centrifugal fiberization and cotton collection methods are the same as above and are not repeated here. In the present application, the diameter of the rock wool fibers obtained after the centrifugal fiberization and cotton collection is preferably 4 to 7 μm, more preferably 5 to 6 μm.

[0084] After obtaining the rock wool fibers, the present application crushes, combs, and disperses the rock wool fibers, and adds water, a hydrophobic agent, and a flame retardant during the crushing process to obtain rock wool fiber staples.

[0085] In the present application, during the pulverization process, the amount of water added is preferably 3-10% of the mass of the rock wool fiber, more preferably 4%.

[0086] In this application, the water repellent is preferably a silicone water repellent. In a specific embodiment of this application, the manufacturer of the silicone water repellent is Shanghai Mufa Industrial Co., Ltd., and the model number is C245. In this application, the mass of the water repellent is preferably 0.3-8% of the mass of the rock wool fiber, more preferably 0.5-5%, and even more preferably 1-2%. In this application, the water repellent imparts excellent water repellency to the rock wool fiberboard.

[0087] In the present application, the mass of the flame retardant is preferably 1-8% of the mass of the rock wool fiber, more preferably 2-5%, and even more preferably 3%. In the present application, the flame retardant preferably includes a liquid flame retardant and / or a powder flame retardant. In the present application, the liquid flame retardant is preferably a phosphate flame retardant, and the powder flame retardant preferably includes one or more of magnesium hydroxide, aluminum hydroxide, and red phosphorus. In the present application, the particle size of the powder flame retardant is preferably 1-20 μm, more preferably 5-15 μm.

[0088] The present application has no special requirements for the specific pulverization method, and a pulverization method well known to those skilled in the art can be used. In the present application, the length of the rock wool fiber staple is preferably 250 to 4500 μm, more preferably 250 to 1500 μm.

[0089] After obtaining the rock wool fiber staple, the rock wool fiber staple is uniformly mixed with an adhesive, evenly laid, and preformed under steam to obtain a preformed board. In this application, the mass of the adhesive is 8-14% of the mass of the rock wool fiber board, preferably 11-12.5%.

[0090] In the present application, the adhesive preferably includes a water-based adhesive and / or a solid adhesive. In the present application, the water-based adhesive preferably includes a water-based phenolic resin adhesive or an MDI adhesive. In the present application, the solids content of the water-based adhesive is preferably 40-55%. When using a water-based adhesive, the amount of the water-based adhesive used is such that the weight percentage of the adhesive in the rock wool fiberboard is 8-14%.

[0091] In the present application, the solid glue is preferably powdered phenolic resin glue. In the present application, the source of the adhesive is commercially available.

[0092] In the present application, the preforming method is preferably compression molding; the present application preheats the preformed board through steam, which can reduce the temperature difference between the core layer and the surface layer of the preformed board, so as to facilitate the subsequent hot pressing and avoid the core layer adhesive from being cured thoroughly, thereby improving the strength of the rock wool fiberboard.

[0093] In the present application, the core temperature of the preformed board is preferably 60-110°C, more preferably 80-100°C.

[0094] After obtaining the preformed board, the present application performs hot pressing on the preformed board to obtain a rock wool fiberboard. The present application preferably performs hot pressing in a hot oil heat conduction hot press. In the present application, the hot pressing temperature is preferably 220-270°C, more preferably 240-260°C; the pressure is preferably 2-7 N / mm 2 , more preferably 4 to 6 N / mm 2 , more preferably 5N / mm 2 In the present application, the heat preservation and pressure holding time of the hot pressing is preferably 270 to 400 seconds, more preferably 270 to 380 seconds. The hot pressing of the present application under these conditions can ensure the full curing of the adhesive and improve the strength of the rock wool fiberboard.

[0095] The present application provides a rock wool fiberboard prepared by the above preparation method, wherein the organic matter content of the rock wool fiberboard is 8 to 14 wt%, preferably 11 to 12.5 wt%.

[0096] In the present application, the thickness of the rock wool fiberboard is preferably 3 mm to 2.5 cm, more preferably 5 mm to 2 cm, and further preferably 6 mm to 1.5 cm. In the present application, the density of the rock wool fiberboard is preferably 150 to 1400 kg / m 3 Specifically, the rock wool fiberboard is divided into low-density board, medium-density board and high-density board. The density of the low-density board is preferably 150-300 kg / m 3 The density of the medium density board is preferably greater than 300 kg / m 3 and ≤1100kg / m 3 The density of the high-density board is preferably greater than 1100 kg / m 3 .

[0097] The rock wool fiberboard provided in this application has high strength and good fire resistance, waterproofness, weather resistance and air permeability. In this application, the parameters of the rock wool fiberboard are as follows:

[0098] ①Static bending strength ≥ 25MPa;

[0099] ② Elastic modulus ≥ 4000MPa;

[0100] ③ Fire protection grade: A2, refer to standard EN 13501-1;

[0101] ④ Water vapor permeability (23°C, 85% humidity) ≤ 3.5, refer to standard EN 12572;

[0102] ⑤ Thermal expansion coefficient ≤ 11.5×10 -3 mm / m·K, refer to standard EN 438:2 clause 17;

[0103] ⑥ Moisture expansion coefficient (after 4 days) ≤ 0.302mm / m, refer to standard EN 438: 2 clause 17;

[0104] ⑦ Thermal conductivity ≤ 0.4 mm / m·K, refer to EN 10456.

[0105] The rock wool fiberboard and the preparation method thereof provided by the present application are described in detail below in conjunction with the embodiments, but they should not be understood as limiting the scope of protection of the present application.

[0106] Examples 1 to 5

[0107] The rock wool fibers were prepared by an electric furnace melting method. The raw materials of Examples 1 to 5 are shown in Table 1.

[0108] Table 1 Raw materials of Examples 1 to 5 (parts by mass) Note: The particle size of all raw materials is 0.5 to 30 mm.

[0109] The rock wool raw materials are weighed and dried, and then fed into the hopper of the electric furnace for vibrating mixing. The rock wool raw materials are then heated and melted by the electrodes of the electric furnace, with the melting temperature controlled at 1600-1700°C to obtain rock wool slurry.

[0110] The rock wool slurry is introduced into a four-roller centrifuge through a flow channel for centrifugal fiberization at a centrifugal speed of 6800 rpm. Rock wool fibers with a diameter of 4 to 7 μm are obtained after cotton collection.

[0111] The rock wool fibers were crushed, and during the crushing process, 6% water, 1% organic silicon water repellent and 2% flame retardant (phosphate ester) were added to obtain rock wool staple fibers with a length of 300 to 1500 microns. The rock wool staple fibers were mixed with an adhesive (phenolic resin with a solid content of 50%), where the amount of adhesive was 23% of the amount of rock wool fibers. After paving, pre-forming was carried out under steam conditions to make the core layer temperature reach 100°C, and at 240°C and 5N / mm 2 Hot pressing was performed under the following conditions, and the heat preservation and pressing time was 360s to obtain a rock wool fiberboard.

[0112] The actual picture of the rock wool fiberboard obtained in Example 1 is shown in FIG1 .

[0113] The performance test results of the rock wool fiberboards obtained in Examples 1 to 5 are shown in Table 2.

[0114] Table 2 Performance test results of rock wool fiberboard obtained in Examples 1 to 5

[0115] Examples 6 to 14

[0116] The rock wool fiber raw material of Example 1 was used, and the difference from Example 1 was that the amount of adhesive was different. The amount of adhesive and the test results are shown in Table 3.

[0117] Table 3 Performance test results of rock wool fiberboard under different adhesive dosages

[0118] Examples 15 to 20

[0119] The rock wool fiber raw material of Example 1 is used. The difference from Example 1 is that the temperature of the core layer is different. The amount of adhesive used and the test results are shown in Table 4, where the density of the rock wool fiberboard is 1180 kg / m 3 , thickness is 7.2mm.

[0120] Table 4 Performance test results of rock wool fiberboard at different core temperatures

[0121] Examples 21 to 25

[0122] Rock wool fibers were prepared using a cupola. The raw materials for Examples 21 to 25 are shown in Table 5.

[0123] Table 5 Raw materials of Examples 21 to 25 (parts by mass) Note: The diameter of basalt is 8 to 16 cm; the diameter of steel slag is 3 to 8 cm; the diameter of dolomite is 4 to 8 cm; the diameter of rock wool solid waste block is 8 to 16 cm; rock wool solid waste block is made by pressing silicate cement and rock wool solid waste, with a silicate cement content of 15%; the diameter of coke is 8 to 16 cm.

[0124] The rock wool raw material is sent to a cupola for blast combustion at a temperature of 1500-1600° C. to obtain rock wool slurry.

[0125] The rock wool slurry is introduced into a four-roll centrifuge through a flow channel for centrifugal fiberization at a centrifugal speed of 6500-6800 rpm. Rock wool fibers with a diameter of 4-7 μm are obtained after cotton collection.

[0126] The rock wool fibers were crushed, and during the crushing process, 6% water, 1% organic silicon water repellent and 2% flame retardant (phosphate ester) were added to obtain rock wool staple fibers with a length of 300 to 1500 microns. The rock wool staple fibers were mixed with an adhesive (phenolic resin with a solid content of 50%), where the amount of adhesive was 23% of the amount of rock wool fibers. After paving, pre-forming was carried out under steam conditions to make the core layer temperature reach 100°C, and at 240°C and 5N / mm 2 Hot pressing was performed under the following conditions, and the heat preservation and pressing time was 360s to obtain a rock wool fiberboard.

[0127] The performance test results of the rock wool fiberboards obtained in Examples 21 to 25 are shown in Table 6.

[0128] Table 6 Performance test results of rock wool fiberboard obtained in Examples 21 to 25

[0129] Examples 26 to 34

[0130] The rock wool fiber raw material of Example 21 was used. The difference from Example 21 was that the amount of adhesive was different. The amount of adhesive and the test results are shown in Table 7.

[0131] Table 7 Performance test results of rock wool fiberboard under different adhesive dosages (phenolic resin solid content 50%)

[0132] Examples 35 to 40

[0133] The rock wool fiber raw material of Example 21 is used. The difference from Example 21 is that the temperature of the core layer is different. The amount of adhesive used and the test results are shown in Table 8, where the density of the rock wool fiberboard is 1180 kg / m 3 , thickness is 7.2mm.

[0134] Table 8 Performance test results of rock wool fiberboard at different core temperatures

[0135] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A preparation method of rock wool fiber board, comprising the following steps: Providing rock wool fiber, wherein the preparation raw materials of the rock wool fiber include basalt, steel slag, dolomite and rock wool solid waste; Crushing, carding and dispersing the rock wool fiber, and adding water, a water repellent and a flame retardant during the crushing process to obtain short rock wool fiber; Uniformly mixing the short rock wool fiber with an adhesive, uniformly paving, and performing preforming under the condition of passing steam to obtain a preformed board; Performing hot pressing on the preformed board to obtain a rock wool fiber board; The mass percentage content of the adhesive in the rock wool fiber board is 8-14%.

2. The preparation method according to claim 1, characterized in that the preparation method of the rock wool fiber comprises the following steps: (1) Provide the following rock wool raw materials in mass percentage: The particle size of the rock wool raw material is 0.5-30 mm; (2) Mixing and melting the rock wool raw material in an electric furnace to obtain rock wool slurry; (3) Performing centrifugal fiber formation and cotton collection on the rock wool slurry to obtain rock wool fiber.

3. The preparation method according to claim 2, characterized in that the temperature of the electric furnace melting is 1600-1700 °C.

4. The preparation method according to claim 1, characterized in that the preparation method of the rock wool fiber comprises the following steps: ① Providing the following percentage content of rock wool raw materials: Basalt 40-47%, with a particle size of 8-16 cm; Steel slag 0-14%, with a particle size of 3-8 cm; Dolomite 5-11%, with a particle size of 4-8 cm; Rock wool solid waste block 20-30%, and the rock wool solid waste block is obtained by pressing rock wool solid waste and portland cement with a particle size of 8-16 cm; Coke 13-16%, with a particle size of 8-16 cm; ② Sending the rock wool raw material to a cupola furnace for blast combustion to obtain rock wool slurry; ③ Performing centrifugal fiber formation and cotton collection on the rock wool slurry to obtain rock wool fiber.

5. The preparation method according to claim 4, characterized in that the temperature of the blast combustion is 1500-1600 °C.

6. The preparation method according to claim 2 or 4, characterized in that the centrifugal rate of the centrifugal fiber formation is 5800-7600 revolutions per minute; the diameter of the rock wool fiber is 4-7 μm.

7. The preparation method according to claim 1, characterized in that during the crushing process, the addition amount of water is 3-10% of the mass of the rock wool fiber; the mass of the water repellent is 0.3-8% of the mass of the rock wool fiber; the mass of the flame retardant is 1-8% of the mass of the rock wool fiber.

8. The preparation method according to claim 1 or 7, characterized in that the water repellent is an organosilicon water repellent.

9. The preparation method according to claim 1 or 7, characterized in that the flame retardant includes a liquid flame retardant and / or a powder flame retardant; the liquid flame retardant is a phosphate flame retardant; the powder flame retardant includes one or more of magnesium hydroxide, aluminum hydroxide and red phosphorus; the particle size of the powder flame retardant is 1-20 μm.

10. The preparation method according to claim 1, characterized in that The length of the rock wool fiber staple is 250 to 4500 μm.

11. According to the preparation method described in claim 1, characterized in that, the adhesive includes water-based glue and / or solid glue; the water-based glue includes water-based phenolic resin glue or MDI glue; the solid glue is powdered phenolic resin glue.

12. According to the preparation method described in claim 1, characterized in that, the core layer temperature of the preformed board is 80 to 120 °C; The temperature of the hot pressing is 220 to 270 °C, the pressure is 2 to 7 N / mm 2 , and the heat preservation and pressure holding time is 270～420s。 13. The rock wool fiber board prepared by the preparation method described in any one of claims 1 to 12, wherein the organic matter content of the rock wool fiber board is 8 to 14 wt%.

14. According to the rock wool fiber board described in claim 13, characterized in that, The thickness of the rock wool fiber board is 3 mm to 2.5 cm, and the density is 150 to 1400 kg / m 3 .

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