Binding agent for refractory material and preparation method thereof
By using a binder composed of magnesium oxide, glucose, magnesium oleate, and silica powder of different particle sizes in refractory materials, the problem of insufficient strength in refractory materials was solved, and high compressive strength and structural stability of refractory materials were achieved.
Patent Information
- Application Number
- CN202610235265.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-27
- Publication Date
- 2026-05-01
AI Technical Summary
The existing refractory materials are not strong enough to form a whole with sufficient structural strength, which affects the quality and reliability of the finished refractory materials.
A binder for refractory materials is used, the raw materials of which include magnesium oxide, glucose, magnesium oleate, surfactant and silica powder of different particle sizes. By optimizing the particle dispersion state and structural uniformity, the density and compressive strength of the binder are improved.
It significantly improves the compressive strength of refractory materials, forms a dense and uniform overall structure, reduces stress concentration points, and enhances the reliability of the materials.
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Abstract
Description
A binder for refractory materials and its preparation method Technical Field
[0001] This invention relates to the field of refractory materials technology, specifically to a binder for refractory materials and its preparation method. Background Technology
[0002] With the rapid development of high-temperature industries such as metallurgy, chemical industry, building materials, and power, refractory materials, as key linings to ensure the safe and stable operation of these high-temperature industries, directly affect production efficiency, energy consumption, and cost control. Therefore, higher requirements are placed on the performance of refractory materials.
[0003] Currently, in the production process of refractory materials, it is difficult to form a whole with sufficient structural strength using only refractory aggregates and powders. Refractory binders, however, can bind loose refractory raw materials together during production and generate sufficient strength. The quality of the binder directly determines the overall quality and reliability of the finished refractory material. Therefore, there is a need to provide a refractory binder that can further improve the strength of refractory materials. Summary of the Invention
[0004] This invention proposes a binder for refractory materials and its preparation method, which solves the problem of insufficient strength of refractory materials in related technologies.
[0005] The technical solution of the present invention is as follows: The present invention proposes a binder for refractory materials, wherein the raw materials of the binder include the following components by weight: 80-100 parts of magnesium oxide, 20-25 parts of glucose, 0.5-1 parts of magnesium oleate, 1-3 parts of surfactant, and 5-10 parts of silica powder; wherein the silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1-2:1.
[0006] The glucose added in this invention can improve the wettability and fluidity of the slurry during the preparation of refractory materials, ensuring the uniform dispersion of the basic components of the refractory material and thus reducing pore defects. At the same time, as a polyhydroxy compound, glucose can form an interaction force with magnesium hydroxide produced by the hydration of magnesium oxide and metal ions in the system to reduce structural defects and further improve the compactness and bonding performance of the refractory material.
[0007] As a further technical solution, the average particle size of the spherical silicon micropowder is 5~8μm; the average particle size of the rounded silicon micropowder is 10~15μm.
[0008] As a further technical solution, the average particle size of the magnesium oxide is 30~45μm.
[0009] As a further technical solution, the raw materials for the binder also include trimellitic acid.
[0010] As a further technical solution, the mass ratio of magnesium oleate to trimellitic acid is 7:3~5, for example, it can be 7:3, 7:4, 7:5, preferably 7:4.
[0011] This invention further optimizes the dispersion state and structural uniformity of the internal particles of the binder by adding magnesium oleate and trimellitic acid, thereby improving the compressive strength of the refractory material. The long-chain hydrophobic groups of magnesium oleate can improve the dispersibility of magnesium oxide, spherical and rounded silica powder of different particle sizes in the system, effectively reducing particle agglomeration. Trimericic acid contains multiple carboxyl functional groups, which can form hydrogen bonds with the hydroxyl groups on the particle surface, further improving particle dispersibility. The steric hindrance of magnesium oleate and the hydrogen bonding of trimellitic acid work synergistically to improve the dispersion uniformity and stability of magnesium oxide and silica powder in the system. This allows the binder to significantly reduce stress concentration points caused by agglomeration when applied to refractory materials, thereby promoting the formation of a denser and more uniform overall structure of the green body, thus further improving the compressive strength of the refractory material.
[0012] As a further technical solution, the surfactant is a nonionic surfactant.
[0013] As a further technical solution, the nonionic surfactant includes one or more of lauryl alcohol polyoxyethylene ether, polyoxyethylene stearate, and polyethylene glycol.
[0014] As a further technical solution, the nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester.
[0015] As a further technical solution, the mass ratio of lauryl alcohol polyoxyethylene ether to stearic acid polyoxyethylene ester is 7:3~4.
[0016] The present invention also proposes a method for preparing a binder for refractory materials, which includes the following steps: mixing the raw materials evenly to obtain the binder for refractory materials.
[0017] The working principle and beneficial effects of this invention are as follows: By adding spherical silica powder with an average particle size of 5-8 μm and rounded silica powder with an average particle size of 10-15 μm as silica powder, the binder can have better density and structural stability, thereby improving the compressive strength of the refractory material. The 5-8 μm spherical silica powder can fill the tiny pores between the main raw material particles such as magnesium oxide, effectively reducing the porosity of the binder matrix and improving the overall density. At the same time, the spherical particle shape has good dispersibility and flowability, allowing the silica powder to disperse in the binder raw materials... The 10-15μm rounded silica powder is uniformly distributed in the system. Due to its angular particle shape, it can form an interlocking structure with magnesium oxide particles and spherical silica powder, effectively preventing relative slippage between particles under pressure. The particle size gradient of spherical and rounded silica powder achieves a hierarchical combination from micropore filling to skeleton support, allowing the binder to form a stable and dense overall structure. When this binder is applied to refractory materials, it can give the refractory material matrix matching density and structural stability, thereby significantly improving the compressive strength of the refractory material. Detailed Implementation
[0018] 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.
[0019] In the following examples and comparative examples: lauryl alcohol polyoxyethylene ether is AEO-5 lauryl alcohol polyoxyethylene ether; stearic acid polyoxyethylene ester, model: SG-9; magnesium oxide has an average particle size of 40μm, spherical silica powder and rounded silica powder, manufacturer: Jiangsu Lianrui New Materials Co., Ltd.; glucose is anhydrous glucose.
[0020] Example 1: A method for preparing a binder for refractory materials, comprising the following steps: mixing 80 parts of magnesium oxide, 20 parts of glucose, 0.5 parts of magnesium oleate, 1 part of nonionic surfactant, and 5 parts of silica powder evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3; the silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1:1; the average particle size of the spherical silica powder is 5 μm; and the average particle size of the rounded silica powder is 10 μm.
[0021] Example 2: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, and 8 parts of silica powder evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5; the silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1:1; the average particle size of the spherical silica powder is 6 μm; and the average particle size of the rounded silica powder is 12 μm.
[0022] Example 3: A method for preparing a binder for refractory materials, comprising the following steps: mixing 100 parts of magnesium oxide, 25 parts of glucose, 1 part of magnesium oleate, 3 parts of nonionic surfactant, and 10 parts of silica powder evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:4; the silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1:1; the average particle size of the spherical silica powder is 8 μm; and the average particle size of the rounded silica powder is 15 μm.
[0023] Example 4: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, and 8 parts of silica powder evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5; the silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1.5:1; the average particle size of the spherical silica powder is 6 μm; and the average particle size of the rounded silica powder is 12 μm.
[0024] Example 5: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, and 8 parts of silica powder evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5; the silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 2:1; the average particle size of the spherical silica powder is 6 μm; and the average particle size of the rounded silica powder is 12 μm.
[0025] Example 6: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, 8 parts of silica powder, and trimellitic acid evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5, and the mass ratio of magnesium oleate to trimellitic acid is 7:3. The silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1:1. The average particle size of the spherical silica powder is 6 μm, and the average particle size of the rounded silica powder is 12 μm.
[0026] Example 7: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, 8 parts of silica powder, and trimellitic acid evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5, and the mass ratio of magnesium oleate to trimellitic acid is 7:3.5. The silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1:1. The average particle size of the spherical silica powder is 6 μm, and the average particle size of the rounded silica powder is 12 μm.
[0027] Example 8: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, 8 parts of silica powder, and trimellitic acid evenly to obtain a binder for refractory materials. The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5, and the mass ratio of magnesium oleate to trimellitic acid is 7:4. The silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1:1. The average particle size of the spherical silica powder is 6 μm, and the average particle size of the rounded silica powder is 12 μm.
[0028] Comparative Example 1: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, and 8 parts of silica powder evenly to obtain a binder for refractory materials, wherein the nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5; the silica powder is spherical silica powder; the average particle size of the spherical silica powder is 6 μm.
[0029] Comparative Example 2: A method for preparing a binder for refractory materials, comprising the following steps: mixing 90 parts of magnesium oxide, 23 parts of glucose, 0.8 parts of magnesium oleate, 2 parts of nonionic surfactant, and 8 parts of silica powder evenly to obtain a binder for refractory materials, wherein the nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester in a mass ratio of 7:3.5; the silica powder is rounded silica powder; the average particle size of the rounded silica powder is 12 μm.
[0030] In the experimental examples, the binders prepared in Examples 1-8 and Comparative Examples 1-2 were used to prepare refractory materials according to the following weight percentages: 33% brown fused alumina with an average particle size of 2 mm, 30% brown fused alumina with an average particle size of 0.5 mm, 10% brown fused alumina with an average particle size of 0.05 mm, 10% white fused alumina with an average particle size of 0.05 mm, 5% α-Al2O3 with an average particle size of 5 μm, 5% binder, and 7% water.
[0031] The preparation method of the refractory material is as follows: 33% brown fused alumina with an average particle size of 2 mm, 30% brown fused alumina with an average particle size of 0.5 mm, 10% brown fused alumina with an average particle size of 0.05 mm, 10% white fused alumina with an average particle size of 0.05 mm, 5% α-Al2O3 with an average particle size of 5 μm, and 5% binder are stirred evenly. 7% water is added and stirred for 10 minutes to obtain a slurry. The slurry is poured into a mold for molding. After molding, the sample is naturally cured in the mold for 24 hours, then demolded. After demolding, it continues to be naturally cured for 24 hours, and then baked in an oven at 200℃ for 24 hours. The dried sample is tested for its room temperature compressive strength according to GB / T 5072-2023 "Test Method for Room Temperature Compressive Strength of Refractory Materials". The test method is Method 1. The sample is a cylinder with a diameter of 50 mm and a height of 50 mm, and the loading rate is 0.2 MPa / s. The test results are shown in Table 1 below.
[0032] Table 1. Test results of binder performance in refractory materials in Examples 1-8 and Comparative Examples 1-2
[0033] As shown in Table 1, the compressive strength of the refractory materials in Examples 1-5 is higher than that in Comparative Examples 1-2, indicating that the present invention improves the compressive strength of the refractory materials by adding spherical silica powder with average particle sizes of 1-3 μm and 5-8 μm and rounded silica powder with average particle sizes of 8-12 μm and 15-20 μm as silica powder.
[0034] As shown in Table 1, the compressive strength of the refractory materials in Examples 6-8 is higher than that in Example 2, indicating that the present invention further improves the compressive strength of the refractory materials by adding trimellitic acid.
[0035] 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 binder for refractory materials, characterized in that, The raw materials of the binder include the following components by weight: 80-100 parts magnesium oxide, 20-25 parts glucose, 0.5-1 parts magnesium oleate, 1-3 parts surfactant, and 5-10 parts silica powder; the silica powder is composed of spherical silica powder and rounded silica powder in a mass ratio of 1-2:
1.
2. The binder for refractory materials according to claim 1, characterized in that, The average particle size of the spherical silicon micropowder is 5~8μm; the average particle size of the rounded silicon micropowder is 10~15μm.
3. The binder for refractory materials according to claim 1, characterized in that, The average particle size of the magnesium oxide is 30~45μm.
4. The binder for refractory materials according to claim 1, characterized in that, The binder also includes trimellitic acid as a raw material.
5. The binder for refractory materials according to claim 4, characterized in that, The mass ratio of magnesium oleate to trimellitic acid is 7:3~5.
6. The binder for refractory materials according to claim 1, characterized in that, The surfactant is a nonionic surfactant.
7. The binder for refractory materials according to claim 6, characterized in that, The nonionic surfactant includes one or more of lauryl alcohol polyoxyethylene ether, polyoxyethylene stearate, and polyethylene glycol.
8. The binder for refractory materials according to claim 7, characterized in that, The nonionic surfactant is composed of lauryl alcohol polyoxyethylene ether and stearic acid polyoxyethylene ester.
9. A binder for refractory materials according to claim 8, characterized in that, The mass ratio of lauryl alcohol polyoxyethylene ether to stearic acid polyoxyethylene ester is 7:3~4.
10. A method for preparing a binder for refractory materials, used to prepare the binder for refractory materials as described in any one of claims 1 to 9, characterized in that, The process includes the following steps: after the raw materials are mixed evenly, a binder for refractory materials is obtained.