A high-strength fireproof rock wool board and its preparation method

Abstract

This invention relates to the field of rock wool board technology, and proposes a high-strength fireproof rock wool board and its preparation method. The high-strength fireproof rock wool board comprises, from top to bottom, a fireproof layer and a thermal insulation layer. The fireproof layer comprises the following components by weight: 70-80 parts rock wool fiber, 20-30 parts of first modified waste ceramic powder, 5-12 parts epoxy resin, 10-15 parts flame retardant, 3-5 parts water repellent, and 1-3 parts curing agent. The thermal insulation layer comprises the following components by weight: 30-40 parts rock wool fiber, 60-70 parts of second modified waste ceramic powder, 8-15 parts epoxy resin, and 2-4 parts curing agent. Both the first and second modified waste ceramic powders are modified waste ceramic powders, specifically waste ceramic powders first modified with methyl dichlorophosphate and then modified with hydroxycarboxylic acid compounds. This technical solution solves the problem of low strength in existing rock wool boards.

Description

Technical Field

[0001] This invention relates to the field of rock wool board technology, specifically to a high-strength fireproof rock wool board and its preparation method. Background Technology

[0002] Rock wool board is a board material made from rock wool as the main raw material, with the addition of adhesives, water-repellent agents, etc., and then processed through curing, cutting, and laminating. It is a multi-functional thermal insulation material with advantages such as waterproof and moisture-proof, insulation, cold insulation, heat insulation, light weight, corrosion resistance, non-combustibility, low thermal conductivity, and easy installation. It is widely used in many fields such as construction, shipbuilding, and metallurgy.

[0003] Most existing rock wool board products are composite boards, which improve the overall performance of rock wool boards by combining functional layers with different properties. At the same time, some waste materials are added to reduce production costs on the one hand and maximize the resource utilization of waste materials on the other hand. However, the resulting rock wool boards have low strength. Summary of the Invention

[0004] This invention proposes a high-strength fireproof rock wool board and its preparation method, which solves the problem of low strength of rock wool boards in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] A high-strength fireproof rock wool board, comprising a fireproof layer and a tensile layer from top to bottom;

[0007] The fireproof layer comprises the following components by weight: 70-80 parts rock wool fiber, 20-30 parts first modified waste ceramic powder, 5-12 parts epoxy resin, 10-15 parts flame retardant, 3-5 parts water repellent, and 1-3 parts curing agent.

[0008] The raw materials of the insulation layer include the following components in parts by weight: 30-40 parts rock wool fiber, 60-70 parts second modified waste ceramic powder, 8-15 parts epoxy resin, and 2-4 parts curing agent.

[0009] Both the first modified waste ceramic powder and the second modified waste ceramic powder are modified waste ceramic powders, which are waste ceramic powders that have been modified by methyl dichlorophosphate and then by hydroxycarboxylic acid compounds.

[0010] As a further technical solution, the hydroxycarboxylic acid compound can be any compound containing a hydroxyl group and a carboxylic acid, preferably one or more of 7-hydroxyheptanoic acid, 9-hydroxynonanoic acid, and 6-hydroxyhexanoic acid.

[0011] As a further technical solution, the mass-to-volume ratio of the waste ceramic powder to methyl dichlorophosphate is 8g:100~150mL.

[0012] As a further technical solution, the mass-to-volume ratio of the hydroxycarboxylic acid compound to methyl dichlorophosphate is 1~2g:120mL.

[0013] As a further technical solution, the present invention limits the mass-to-volume ratio of hydroxycarboxylic acid compounds to methyl dichlorophosphate to 1~2g:120mL, which further improves the tensile strength and waterproofness of rock wool boards.

[0014] As a further technical solution, the mass ratio of epoxy resin to the first modified waste ceramic powder in the insulation layer is 12:25.

[0015] As a further technical solution, the mass ratio of epoxy resin to second modified waste ceramic powder in the fireproof layer is 2:13.

[0016] This invention limits the mass ratio of epoxy resin to first modified waste ceramic powder in the insulation layer to 12:25, and the mass ratio of epoxy resin to second modified waste ceramic powder in the fireproof layer to 2:13, thereby further improving the tensile strength and waterproofness of the rock wool board.

[0017] As a further technical solution, the preparation method of the modified waste ceramic powder includes the following steps:

[0018] S1. Mix waste ceramic powder with methyl dichlorophosphate, react, filter, wash, and dry to obtain pretreated ceramic powder;

[0019] S2. The pretreated ceramic powder, hydroxycarboxylic acid compound and solvent are mixed and reacted to obtain modified waste ceramic powder.

[0020] As a further technical solution, the reaction temperature in S1 and S2 is independently 60~65℃, and the reaction time is independently 5~6h.

[0021] As a further technical solution, the flame retardant includes one or both of tricresyl phosphate and triphenyl phosphate.

[0022] As a further technical solution, the hydrophobic agent is an organosilicon hydrophobic agent.

[0023] As a further technical solution, the curing agent independently includes one or two of aliphatic polyamine curing agents and aromatic polyamine curing agents.

[0024] This invention also proposes a method for preparing a high-strength fireproof rock wool board, comprising the following steps:

[0025] A1. Mix the raw materials of the fireproof layer with water evenly to obtain the fireproof layer mixture;

[0026] A2. Mix the raw materials of the insulation layer with water evenly to obtain the insulation layer mixture;

[0027] A3. The fireproof layer mixture and the thermal insulation layer mixture are injected into the mold one after another, dried, hot-pressed and molded, and demolded to obtain rock wool board.

[0028] The working principle and beneficial effects of this invention are as follows:

[0029] This invention provides a high-strength fireproof rock wool board, comprising a fireproof layer and an insulation layer from top to bottom. Both the fireproof and insulation layers contain modified waste ceramic powder, which imparts excellent fire resistance and insulation properties to the rock wool board. Furthermore, the modified waste ceramic powder, obtained by first modifying it with methyl dichlorophosphate and then with hydroxycarboxylic acid compounds, has carboxyl groups on its surface. These carboxyl groups react with the epoxy resin in the same layer, increasing the degree of cross-linking and improving the compatibility between the waste ceramic powder and the epoxy resin. Simultaneously, they react with the epoxy resin in other layers, enhancing the interlayer bonding strength, thereby improving the tensile strength and waterproofness of the rock wool board. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] In the following examples and comparative examples, the average length of the rock wool fiber is 2 mm, the average particle size of the waste ceramic powder is 300 mesh, it needs to be dried to constant weight before use, the epoxy resin is CYD-011, and the water repellent is organosilicon water repellent SHP50.

[0032] Example 1

[0033] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0034] S2. Mix the pretreated ceramic powder with 5g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide, react at 60℃ for 6h, filter, wash, and dry to obtain modified waste ceramics.

[0035] S3. Mix 75 parts of rock wool fiber, 20 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0036] S4. Mix 35 parts of rock wool fiber, 60 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0037] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0038] Example 2

[0039] S1. Mix 80g of waste ceramic powder with 1000mL of methyl dichlorophosphate, react at 65℃ for 5h, filter, wash, and dry to obtain pretreated ceramic powder.

[0040] S2. Mix the pretreated ceramic powder with 5g of 9-hydroxynonanoic acid and 1000mL of dimethyl sulfoxide, react at 60℃ for 6h, filter, wash, and dry to obtain modified waste ceramics.

[0041] S3. Mix 70 parts of rock wool fiber, 20 parts of modified waste ceramics, 5 parts of epoxy resin, 10 parts of triphenyl phosphate, 3 parts of water repellent, 1 part of tetraethylenepentamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0042] S4. Mix 30 parts of rock wool fiber, 60 parts of modified waste ceramics, 8 parts of epoxy resin, 2 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0043] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 270℃ and 9MPa for 1.5h to form the rock wool board. The thickness of the fireproof layer is 10mm and the thickness of the insulation layer is 40mm.

[0044] Example 3

[0045] S1. Mix 80g of waste ceramic powder with 1500mL of methyl dichlorophosphate, react at 65℃ for 5h, filter, wash, and dry to obtain pretreated ceramic powder.

[0046] S2. Mix the pretreated ceramic powder with 5g of 6-hydroxyhexanoic acid and 1000mL of dimethyl sulfoxide, react at 60℃ for 6h, filter, wash, and dry to obtain modified waste ceramics.

[0047] S3. Mix 80 parts of rock wool fiber, 20 parts of modified waste ceramics, 12 parts of epoxy resin, 15 parts of triphenyl phosphate, 5 parts of water repellent, 3 parts of triethylenetetramine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0048] S4. Mix 40 parts of rock wool fiber, 60 parts of modified waste ceramics, 15 parts of epoxy resin, 4 parts of diaminodiphenylmethane and 40 parts of water evenly to obtain the insulation layer mixture.

[0049] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 280℃ and 8MPa for 2.5h to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 20mm and the thickness of the insulation layer is 30mm.

[0050] Example 4

[0051] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0052] S2. Mix the pretreated ceramic powder with 10g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide, react at 60℃ for 6h, filter, wash, and dry to obtain modified waste ceramics.

[0053] S3. Mix 75 parts of rock wool fiber, 20 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0054] S4. Mix 35 parts of rock wool fiber, 60 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0055] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0056] Example 5

[0057] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0058] S2. The pretreated ceramic powder was mixed with 15g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide. After reacting at 60℃ for 6h, the mixture was filtered, washed, and dried to obtain modified waste ceramics.

[0059] S3. Mix 75 parts of rock wool fiber, 20 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0060] S4. Mix 35 parts of rock wool fiber, 60 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0061] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0062] Example 6

[0063] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0064] S2. Mix the pretreated ceramic powder with 20g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide, react at 60℃ for 6h, filter, wash, and dry to obtain modified waste ceramics.

[0065] S3. Mix 75 parts of rock wool fiber, 20 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0066] S4. Mix 35 parts of rock wool fiber, 60 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0067] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0068] Example 7

[0069] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0070] S2. The pretreated ceramic powder was mixed with 25g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide. After reacting at 60℃ for 6h, the mixture was filtered, washed, and dried to obtain modified waste ceramics.

[0071] S3. Mix 75 parts of rock wool fiber, 20 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0072] S4. Mix 35 parts of rock wool fiber, 60 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0073] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0074] Example 8

[0075] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0076] S2. The pretreated ceramic powder was mixed with 15g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide. After reacting at 60℃ for 6h, the mixture was filtered, washed, and dried to obtain modified waste ceramics.

[0077] S3. Mix 75 parts of rock wool fiber, 25 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0078] S4. Mix 35 parts of rock wool fiber, 60 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0079] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0080] Example 9

[0081] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0082] S2. The pretreated ceramic powder was mixed with 15g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide. After reacting at 60℃ for 6h, the mixture was filtered, washed, and dried to obtain modified waste ceramics.

[0083] S3. Mix 75 parts of rock wool fiber, 30 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0084] S4. Mix 35 parts of rock wool fiber, 60 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0085] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0086] Example 10

[0087] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0088] S2. The pretreated ceramic powder was mixed with 15g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide. After reacting at 60℃ for 6h, the mixture was filtered, washed, and dried to obtain modified waste ceramics.

[0089] S3. Mix 75 parts of rock wool fiber, 25 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0090] S4. Mix 35 parts of rock wool fiber, 65 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0091] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0092] Example 11

[0093] S1. Mix 80g of waste ceramic powder with 1200mL of methyl dichlorophosphate, react at 60℃ for 6h, filter, wash and dry to obtain pretreated ceramic powder.

[0094] S2. The pretreated ceramic powder was mixed with 15g of 7-hydroxyheptanoic acid and 1000mL of dimethyl sulfoxide. After reacting at 60℃ for 6h, the mixture was filtered, washed, and dried to obtain modified waste ceramics.

[0095] S3. Mix 75 parts of rock wool fiber, 25 parts of modified waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0096] S4. Mix 35 parts of rock wool fiber, 70 parts of modified waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0097] S5. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0098] Comparative Example 1

[0099] S1. Mix 75 parts of rock wool fiber, 20 parts of waste ceramics, 10 parts of epoxy resin, 12 parts of tricresyl phosphate, 4 parts of water repellent, 2 parts of diethylenetriamine and 40 parts of water evenly to obtain the fireproof layer mixture.

[0100] S2. Mix 35 parts of rock wool fiber, 60 parts of waste ceramics, 12 parts of epoxy resin, 3 parts of m-phenylenediamine and 40 parts of water evenly to obtain the insulation layer mixture.

[0101] S3. The fireproof layer mixture and the insulation layer mixture are injected into the mold one after another, dried, and hot-pressed at 260℃ and 10MPa for 2 hours to form. After demolding, rock wool board is obtained, wherein the thickness of the fireproof layer is 15mm and the thickness of the insulation layer is 35mm.

[0102] The rock wool boards obtained in Examples 1-11 and Comparative Example 1 were tested for their tensile strength perpendicular to the surface according to the method in GB / T 30804-2014 "Determination of Tensile Strength of Building Insulation Products Perpendicular to Surface" and their volumetric moisture absorption rate was tested according to the method in GB / T 5480-2017 "Test Methods for Mineral Wool and Its Products". The test results are recorded in Table 1.

[0103] Table 1. Tensile strength and volumetric moisture absorption rate of rock wool board perpendicular to the surface.

[0104]

[0105] As can be seen from Table 1, the rock wool board provided by the present invention has a tensile strength perpendicular to the surface of more than 24 kPa and a volume moisture absorption rate of less than 0.83%, exhibiting high strength and good waterproof properties.

[0106] Compared with Comparative Example 1, Examples 1-11 used waste ceramic powder that was first modified with methyl dichlorophosphate and then modified with hydroxycarboxylic acid compounds, while Comparative Example 1 used unmodified waste ceramic powder. The rock wool boards obtained in Examples 1-11 had a higher tensile strength perpendicular to the surface and a lower volumetric moisture absorption rate than Comparative Example 1, indicating that waste ceramic powder that was first modified with methyl dichlorophosphate and then modified with hydroxycarboxylic acid compounds can improve the strength and waterproofness of rock wool boards.

[0107] The rock wool boards obtained in Examples 4-6 have higher tensile strength perpendicular to the surface than those in Examples 1 and 7, and lower volumetric moisture absorption than those in Examples 1 and 7. This indicates that a mass-to-volume ratio of hydroxycarboxylic acid compounds to methyl dichlorophosphate of 1-2 g: 120 mL can further improve the strength and water resistance of the rock wool boards.

[0108] The rock wool board obtained in Example 10 has a higher tensile strength perpendicular to the surface than the other examples and a lower volumetric moisture absorption rate than the other examples. This indicates that the mass ratio of epoxy resin to the first modified waste ceramic powder in the insulation layer is 12:25, while the mass ratio of epoxy resin to the second modified waste ceramic powder in the fireproof layer is 2:13, which can further improve the strength and waterproofness of the rock wool board.

[0109] The rock wool boards obtained in Examples 1 to 11 were tested for combustion performance according to the method in GB 8624-2012 "Classification of Combustion Performance of Building Materials and Products", and the test results are recorded in Table 2.

[0110] Table 2 Fire performance ratings of rock wool boards

[0111]

[0112] As can be seen from Table 2, the rock wool board provided by the present invention has a fire performance rating of Class A, and has good fire resistance.

[0113] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high strength fire resistant rock wool board, characterized in that, The fireproof layer and the thermal insulation layer are sequentially arranged from top to bottom. The raw material of the fireproof layer comprises the following components in parts by mass: 70-80 parts of rock wool fiber, 20-30 parts of first modified waste ceramic powder, 5-12 parts of epoxy resin, 10-15 parts of flame retardant, 3-5 parts of water repellent agent, and 1-3 parts of curing agent. The raw material of the thermal insulation layer comprises the following components in parts by mass: 30-40 parts of rock wool fiber, 60-70 parts of second modified waste ceramic powder, 8-15 parts of epoxy resin, and 2-4 parts of curing agent. The first modified waste ceramic powder and the second modified waste ceramic powder are both modified waste ceramic powder, and the modified waste ceramic powder is waste ceramic powder modified by methyl dichlorophosphate and then by hydroxyl carboxylic acid compound. The preparation method of the modified waste ceramic powder comprises the following steps: S1, mixing waste ceramic powder and methyl dichlorophosphate, reacting, filtering, washing, and drying to obtain pretreated ceramic powder; S2, mixing the pretreated ceramic powder, hydroxyl carboxylic acid compound, and solvent, and reacting to obtain modified waste ceramic powder; The reaction temperature in S1 and S2 is independently 60-65℃, and the reaction time is independently 5-6h.

2. A high strength fire resistant rock wool board according to claim 1, characterized in that, The mass-volume ratio of the waste ceramic powder to methyl dichlorophosphate is 8g: 100-150mL.

3. A high strength fire resistant rock wool board according to claim 2, characterized in that, The mass-volume ratio of the hydroxyl carboxylic acid compound to methyl dichlorophosphate is 1-2g: 120mL.

4. The high strength fire resistant rock wool board according to claim 1, characterized in that, The mass ratio of the epoxy resin to the first modified waste ceramic powder in the thermal insulation layer is 12:

25.

5. The high strength fire resistant rock wool board according to claim 1, characterized in that, The mass ratio of the epoxy resin to the second modified waste ceramic powder in the fireproof layer is 2:

13.

6. The high strength fire resistant rock wool board according to claim 1, wherein, The flame retardant comprises one or both of trimethylphenyl phosphate and triphenyl phosphate; and the water repellent agent is an organic silicon water repellent agent.

7. The high strength fire resistant rock wool board according to claim 1, wherein, The curing agent independently comprises one or both of aliphatic polyamine curing agent and aromatic polyamine curing agent.

8. The method of claim 1 to 7, wherein the method is characterized by, The method comprises the following steps: A1, uniformly mixing the raw material of the fireproof layer with water to obtain fireproof layer mixture; A2, uniformly mixing the raw material of the thermal insulation layer with water to obtain thermal insulation layer mixture; A3, sequentially injecting the fireproof layer mixture and the thermal insulation layer mixture into a mold, drying, hot-pressing, demolding, and obtaining a rock wool board.

Images