Preparation method of low-density rock wool board
Fibrous material is formed by mixing raw materials in a specific proportion and melting at high temperature, and spraying polymer solution during centrifugation fiber formation, and then compressing and forming after solidification. Combined with the use of surface modifiers and glass fiber grid cloth, the shortcomings of rock wool boards in high refractory and insulation performance are solved, and low density, high refractory and good insulation are achieved.
Patent Information
- Application Number
- CN202510445552.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2025-06-20
AI Technical Summary
Existing rock wool boards cannot meet the demand for high fire resistance in fireproof sealing between building layers. At the same time, their insulation performance will decrease after absorbing water, and conventional improvement methods will increase the density of the board, affecting the lightweight properties.
The preparation method of low-density rock wool board is adopted, and the mixture and high-temperature melting of raw materials such as basalt, coke, perlite, sodium boron calcite, nephroxene and other raw materials are mixed and melted at a specific ratio to form fibrous materials. The polymer solution is sprayed during the centrifugation fiber formation process, and then compressed and molded after solidification. Meanwhile, surface-coated modifiers and fiberglass mesh cloth are applied to improve surface mechanical properties and waterproof properties.
It realizes the high fire resistance, low density characteristics and good thermal insulation effect of rock wool boards, and at the same time improves the stability and weather resistance of the boards, meeting the demand for high-performance fire-proof sealing materials in the interlayer structure of the building.
Smart Images
Figure CN120172637A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of rock wool board preparation, and more specifically, it relates to a preparation method of low-density rock wool board. Background Art
[0002] In modern society, rock wool boards are widely used as thermal insulation materials in fields such as construction and ships. Currently, the fire resistance limit of rock wool in the market is generally about 1 hour. However, when used for fireproof sealing of building floor structures, higher fire resistance performance requirements are required for rock wool boards. Ordinary rock wool cannot meet this requirement. In order to meet the needs of modern technological development, a rock wool product with a higher fire resistance limit is needed as a high-performance fireproof material to meet the requirements for high-performance fireproof sealing materials in the field of building floor structures. Rock wool boards are excellent thermal insulation materials because there are many capillary pores filled with air inside them, and these capillary pores can minimize heat exchange to a great extent. However, most silicate materials have hydrophilic properties to varying degrees, especially high-porosity thermal insulation materials, and the water absorption in their capillary pores will increase significantly, resulting in a decrease in their thermal insulation performance. Incorporating some materials with non-hydrophilic properties will improve the thermal insulation effect, but these materials often increase the density of the rock wool board, making the prepared rock wool board heavier, while thermal insulation materials generally require to maintain light weight for easy construction and transportation. Summary of the Invention
[0003] Aiming at the problems existing in the prior art, the present invention provides a preparation method of low-density rock wool board to solve the technical problems mentioned in the background art. Technical Solution
[0004] To achieve the above object, the present invention provides the following technical solution: A preparation method of low-density rock wool board, comprising the following steps: Step 1: According to weight parts, take the following raw materials: 600 - 800 parts of basalt, 150 - 220 parts of coke, 30 - 80 parts of perlite, 20 - 50 parts of ulexite, 20 - 50 parts of aegirine-augite, 20 - 50 parts of dolomite, 20 - 50 parts of hematite, and 20 - 50 parts of bauxite; Step 2: Take basalt, dolomite, hematite, and bauxite according to mass parts, mix them evenly, and then input the mixture into an electric furnace to be melted into a molten slurry at a high temperature of 1500°C - 1800°C; Step 3: Mix the raw materials described in Step 1, then crush them. The material melted in Step 2 is made into fibers through centrifugal fiberization, and the fibers are collected and stacked into a fiber strip shape; during the centrifugal process, a polymer solution is sprayed, and the spraying amount is 30 - 50 kg / ton of fiber; the polymer solution is an aqueous solution composed of methyl cellulose and polyacrylamide, the mass percentage of methyl cellulose is 5 - 10%, and polyacrylamide is 3 - 5%; Step 4: Cure the fiber strips prepared in Step 3, and compress the fiber strips during curing to obtain a rock wool insulation board; Step 5: Take 1 rock wool bare board, evenly coat the mixed surface isolation modifier on the board surface; lay the cut glass fiber mesh cloth flat on the rock wool board coated with the modifier, then coat another layer of surface isolation modifier to make the surface isolation modifier evenly cover the surface of the mesh cloth, and dry it to obtain a graphite-modified rock wool board.
[0005] The present invention is further provided that the preparation method of the surface isolation modifier is as follows: Weigh 13 - 30 parts of cement, 10 - 18 parts of quartz sand, 16 - 28 parts of fine sand, 4 - 11 parts of rosin-based graphite, 5 - 10 parts of 707 emulsion, 9 - 18 parts of alkalinity regulator, and 10 - 22 parts of water according to mass parts, stir and mix evenly to obtain the surface isolation modifier.
[0006] The present invention is further provided that the preparation method of the rosin-based graphite is as follows: S1: Weigh 22 - 40 parts of graphite according to mass parts. First, mix the graphite with 30 - 52 parts of concentrated nitric acid, stir at room temperature and then filter, repeatedly wash with deionized water until the filtrate is neutral, and dry to obtain acid-treated graphite; then add 0.5 - 2 parts of amino silane coupling agent and 85 - 100 parts of ethanol, ultrasonicate, react at 70 - 90 °C for 2 - 5 h, and filter to obtain amino graphite; S2: Add 20 - 28 parts of maleic acid rosin ester, 0.01 - 0.1 part of amino ferrocene, 10 - 17 parts of amino graphite, and 2 - 5 parts of potassium hydroxide into a stirring kettle, introduce nitrogen, stir at 60 - 70 °C for 1 - 3 h, and filter to obtain rosin-based graphite.
[0007] The present invention is further provided that the acidity coefficient of the rock wool board is 2.5 - 3.
[0008] The present invention is further provided that the organic matter content of the rock wool board is 0.5% - 1.5%.
[0009] The present invention is further provided that the alkalinity regulator is a sodium hydroxide solution with a mass concentration of 10 - 20%.
[0010] The present invention is further provided that the stirring time for preparing the surface isolation modifier is 20 - 40 min.
[0011] The present invention is further provided that the stirring time at room temperature in S1 is 40 - 100 min. Beneficial effects
[0012] Compared with the prior art, the present invention provides a preparation method of a low-density rock wool board, having the following beneficial effects: Compared with the prior art, from the perspectives of construction performance and mechanical properties, the formulation of a special surface modification release agent for rock wool is optimized to meet and improve the basic requirements of the surface mechanical properties, waterproofness and compatibility of rock wool products. When the contents of Fe2O3 and Al2O3 in the chemical composition of the rock wool board described in the present invention are relatively high, the melting point of the eutectic melt is higher. The acidity coefficient of the rock wool board can reach 2.5-3, making the rock wool product have high stability and good weather resistance. In addition, the low-density rock wool board prepared by the present invention has a small density and good heat preservation effect; perlite is added during the preparation process, making the density of the material small. Adding ulexite and aegirine-augite reduces the thermal conductivity of the material and improves the heat preservation performance. The combined use of ulexite and aegirine-augite also has a synergistic effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is the overall flowchart of the preparation method of the low-density rock wool board. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0014] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.
[0015] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.
[0016] In the present invention, unless otherwise stated, the directions such as "up, down" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are usually left and right as shown in the drawings; "inside, outside" refer to the inside and outside of the contour of each component itself, but the above orientation terms do not limit the present invention.
[0017] Please refer to Figure 1 , the preparation method of the low-density rock wool board, comprising the following steps: Step 1: Take the following raw materials according to weight parts: 600 parts of basalt, 150 parts of coke, 30 parts of perlite, 20 parts of ulexite, 20 parts of aegirine-augite, 20 parts of dolomite, 20 parts of hematite and 20 parts of bauxite; Step 2: Take basalt, dolomite, hematite and bauxite according to mass parts and mix them evenly, and then input the mixture into an electric furnace to be melted into a molten slurry at a high temperature of 1500 °C; Step 3: Mix the raw materials described in Step 1, then crush them. Centrifugally fibrillate the material melted in Step 2 to make it fibrous. Collect the fibers and stack and form them into a fibrous strip. Spray a polymer solution during centrifugation, with a spraying amount of 30 kg per ton of fiber. The polymer solution is an aqueous solution compounded from methyl cellulose and polyacrylamide. The mass percentage of methyl cellulose is 5%, and that of polyacrylamide is 3%. Step 4: Cure the fibrous strip prepared in Step 3, and compress the fibrous strip during curing to obtain a rock wool insulation board. Step 5: Take 1 rock wool bare board, evenly coat the mixed surface isolation modifier on the board surface. Smoothly cover the cut fiberglass mesh cloth on the rock wool board coated with the modifier, then coat another layer of surface isolation modifier to make the surface isolation modifier evenly cover the surface of the mesh cloth, and dry it to obtain a graphite-modified rock wool board.
[0018] The present invention is further configured such that the preparation method of the surface isolation modifier is as follows: Weigh 30 parts of cement, 18 parts of quartz sand, 28 parts of fine sand, 11 parts of rosin-based graphite, 10 parts of 707 emulsion, 18 parts of alkalinity regulator, and 22 parts of water by mass fraction, stir and mix them evenly to obtain the surface isolation modifier. Example
[0019] A preparation method of a low-density rock wool board, comprising the following steps: Step 1: Take the following raw materials by weight fraction: 800 parts of basalt, 220 parts of coke, 80 parts of perlite, 50 parts of ulexite, 50 parts of aegirine-augite, 50 parts of dolomite, 50 parts of hematite, and 50 parts of bauxite. Step 2: Take basalt, dolomite, hematite, and bauxite by mass fraction, mix them evenly, and then input the mixture into an electric furnace to be melted into a molten slurry at a high temperature of 1800 °C. Step 3: Mix the raw materials described in Step 1, then crush them. Centrifugally fibrillate the material melted in Step 2 to make it fibrous. Collect the fibers and stack and form them into a fibrous strip. Spray a polymer solution during centrifugation, with a spraying amount of 50 kg per ton of fiber. The polymer solution is an aqueous solution compounded from methyl cellulose and polyacrylamide. The mass percentage of methyl cellulose is 10%, and that of polyacrylamide is 5%. Step 4: Cure the fibrous strip prepared in Step 3, and compress the fibrous strip during curing to obtain a rock wool insulation board. Step 5: Take 1 rock wool bare board, evenly coat the prepared surface isolation modifier on the board surface; lay the cut glass fiber grid cloth flatly on the rock wool board coated with the modifier, and then coat another layer of surface isolation modifier to make the surface isolation modifier evenly cover the surface of the grid cloth, and dry it to obtain the graphite-modified rock wool board.
[0020] In a further embodiment of the present invention, the preparation method of the rosin-based graphite is as follows: S1: Weigh 40 parts of graphite by mass. First, mix the graphite with 52 parts of concentrated nitric acid, stir at room temperature and then filter. Wash repeatedly with deionized water until the filtrate is neutral, and dry to obtain acid-treated graphite; then add 2 parts of amino silane coupling agent and 100 parts of ethanol, sonicate, react at 90 °C for 5 h, and filter to obtain amino graphite; S2: Add 28 parts of maleic acid rosin ester, 0.1 part of amino ferrocene, 17 parts of amino graphite, and 5 parts of potassium hydroxide into a stirring kettle, introduce nitrogen, stir at 70 °C for 3 h, and filter to obtain rosin-based graphite.
[0021] In a further embodiment of the present invention, the acidity coefficient of the rock wool board is 3; the organic matter content of the rock wool board is 1.5%; the alkalinity regulator is a 20% by mass concentration sodium hydroxide solution; the stirring time for preparing the surface isolation modifier is 40 min; the stirring time at room temperature in S1 is 100 min.
[0022] In all the above-mentioned solutions, for the connection between two components, welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods can be selected according to the actual situation, which will not be elaborated one by one here. For those mentioned as fixed connections above, welding is preferably considered. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for preparing a low-density rock wool board, characterized in that: The following steps are involved: Step 1: Take the following raw materials in parts by weight: 600-800 parts of basalt, 150-220 parts of coke, 30-80 parts of perlite, 20-50 parts of ulexite, 20-50 parts of nepheline, 20-50 parts of dolomite, 20-50 parts of hematite and 20-50 parts of bauxite; Step 2: Mix basalt, dolomite, hematite and bauxite evenly according to their mass fractions, and then input the mixture into an electric furnace to melt it at a high temperature of 1500°C-1800°C into a molten slurry; Step 3: Mix the raw materials in step 1, and then crush them, centrifuge the melted material in step 2 into fibers, collect the fibers and stack them to form fiber strips; spray a polymer solution during the centrifugation process, with a spraying amount of 30-50 kg / ton of fiber; the polymer solution is a composite aqueous solution of methyl cellulose and polyacrylamide, with the mass percentage of methyl cellulose being 5-10% and the mass percentage of polyacrylamide being 3-5%; Step 4: solidifying the fiber strips prepared in step 3, and compressing the fiber strips during solidification to obtain a rock wool insulation board; Step 5: Take a bare rock wool board and evenly apply the mixed surface isolation modifier on the board surface; cover the cut glass fiber mesh cloth evenly on the rock wool board coated with the modifier, and then apply a layer of surface isolation modifier so that the surface isolation modifier is evenly covered on the surface of the mesh cloth, and dry it to obtain a graphite modified rock wool board.
2. The method for preparing a low-density rock wool board according to claim 1, characterized in that: The preparation method of the surface isolation modifier is as follows: according to the mass proportions, weigh 13-30 parts of cement, 10-18 parts of quartz sand, 16-28 parts of fine sand, 4-11 parts of rosin-based graphite, 5-10 parts of 707 emulsion, 9-18 parts of alkalinity regulator, and 10-22 parts of water, stir and mix them evenly to obtain the surface isolation modifier.
3. The method for preparing the low-density rock wool board according to claim 1, characterized in that: The preparation method of the rosin-based graphite is: S1: Weigh 22-40 parts of graphite by mass, first mix the graphite with 30-52 parts of concentrated nitric acid, stir at room temperature and filter, repeatedly wash with deionized water until the filtrate is neutral, and dry to obtain acid-treated graphite; then add 0.5-2 parts of aminosilane coupling agent and 85-100 parts of ethanol, ultrasonicate, react at 70-90°C for 2-5h, and filter to obtain amino graphite; S2: Add 20-28 parts of rosin maleate, 0.01-0.1 parts of aminoferrocene, 10-17 parts of amino graphite and 2-5 parts of potassium hydroxide into a stirring kettle, introduce nitrogen, stir at 60-70° C. for 1-3 hours, filter and obtain rosin-based graphite.
4. The method for preparing the low-density rock wool board according to claim 3, characterized in that: The acidity coefficient of the rock wool board is 2.5-3.
5. The method for preparing a low-density rock wool board according to claim 1, characterized in that: The organic matter content of the rock wool board is 0.5%-1.5%.
6. The method for preparing a low-density rock wool board according to claim 4, characterized in that: The alkalinity regulator is a sodium hydroxide solution with a mass concentration of 10-20%.
7. The method for preparing a low-density rock wool board according to claim 4, characterized in that: The stirring time for preparing the surface isolation modifier is 20-40 minutes.
8. The method for preparing a low-density rock wool board according to claim 4, characterized in that: The stirring time of S1 at room temperature is 40-100 min.