Anti-sticking slag coating based on regenerated alumina powder

Abstract

The invention provides an anti-sticking slag coating based on regenerated alumina powder, and relates to the technical field of coatings, the anti-sticking slag coating comprises regenerated alumina powder, an adhesive, a dispersing agent, a thickening agent, a rheological agent and other assistants.The regenerated alumina powder is adopted as a main component, aluminum oxide is used for promoting hydrolysis-condensation reaction of an adhesive precursor, and the anti-sticking slag coating is prepared. An inorganic gel network is formed, normal-temperature curing is achieved, the adhesion situation is remarkably reduced after molten steel and molten aluminum pouring faces are sprayed, and the product performance is excellent; a dispersing agent, a thickening agent and a rheological agent are used for synergistically finishing rheological property regulation and control of the anti-sticking slag coating, a'shear thinning 'flow pattern is constructed, the viscosity is suddenly reduced during spraying so as to realize atomization, the viscosity is increased after spraying, and the anti-sticking slag coating is particularly suitable for uniform film forming of furnace bodies in complex shapes; in the formula, the regenerated aluminum oxide and the selected auxiliaries such as the adhesive, the thickening agent and the rheological agent do not contain volatile organic compounds such as benzene and formaldehyde, the product is free of pungent smell in the spraying process, and the environment-friendly performance of the product is particularly good.

Description

Technical Field

[0001] This invention patent relates to the field of coating technology, specifically to an anti-slag-sticking coating with recycled alumina powder as the main component. Background Technology

[0002] In industrial production, especially in high-temperature environments such as metallurgy and casting, slag adhesion easily occurs on furnace walls or metal surfaces. This not only affects heat exchange efficiency but also increases cleaning difficulty and cost. To address this issue, current market solutions often use anti-slag adhesion coatings, such as silicone resins and fluororesins. These are costly, have poor high-temperature performance, and are environmentally unfriendly. Alternatively, inorganic multi-component systems are used, which are also costly, have short service lives, and slag adhesion can lead to refractory material peeling. Furthermore, their complex application processes and high-temperature sintering make rapid on-site repair difficult, and the coating cannot provide uniform coverage on complex surfaces, further shortening service life, increasing production costs, and reducing efficiency. Therefore, developing an anti-slag adhesion coating that can cure at room temperature, is quick to apply on-site, easy to repair, suitable for complex surfaces, low-cost, effective, and environmentally friendly is of great significance. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-slag-sticking coating based on recycled alumina powder to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this invention provides the following technical solution: an anti-sticking coating based on recycled alumina powder, comprising recycled alumina powder, binder, dispersant, thickener, rheology modifier, and other additives.

[0005] Furthermore, the recycled alumina powder accounts for 50%-80% of the total mass; the binder accounts for 10%-30%; the dispersant accounts for 1%-5%; and the thickener, rheology modifier, and other additives account for 0%-39%. Using recycled alumina as the main material, alumina itself has a melting point as high as 2054℃. High-temperature resistant components can be introduced to further enhance the refractory limit, maintaining structural stability at high temperatures of 1500-1800℃ and resisting high-temperature erosion by molten slag (such as metal oxides and furnace slag). Alumina has low affinity for most molten metals (such as molten iron and aluminum) and acidic / alkaline slags, reducing interfacial chemical reactions and fundamentally inhibiting the chemical bonding force of slag adhesion.

[0006] Furthermore, the adhesive is one or a combination of several water-based or solvent-based silicate, phosphate, or silane coupling agents. It can achieve room temperature curing (spraying, brushing), eliminates the need for sintering, reduces construction energy consumption, and offers convenient and cost-effective application, performing particularly well in on-site repair or complex structural surface protection scenarios.

[0007] Furthermore, the dispersant is one or more of polycarboxylate or polyether surfactants to ensure uniform dispersion of alumina particles, forming a smooth, low-defect surface, preventing agglomeration, reducing slag adhesion sites, and improving coating smoothness and density. Preferably, using a water-based adhesive with a non-toxic dispersant (such as polycarboxylate) can achieve zero VOC emissions, meeting environmental protection requirements. The coating's anti-peeling properties extend its service life by 30%-50%, reducing resource waste caused by frequent repairs.

[0008] Furthermore, the thickener and rheology modifier are one or a combination of water-soluble polymeric thickeners and natural polysaccharide rheology modifiers, which complete the rheological property regulation of the anti-sticking coating and adjust the viscosity of the coating.

[0009] Furthermore, the other additives are one or a combination of several of the following: defoamers, preservatives, thickeners, rheology modifiers, coupling agents, curing agents, and high-temperature and anti-corrosion reinforcing additives. The formulation has a certain degree of flexibility and is easy to apply, and can be adjusted according to actual production needs.

[0010] The defoamers include, but are not limited to: polyether-modified alcohols (such as propylene glycol block polyether, mineral oil compounded with hydrophobic silica), polysiloxane-polyether copolymers, etc.; preservatives include, but are not limited to: isothiazolinone derivatives (such as: methylisothiazolinone, benzisothiazolinone, octylisothiazolinone), natural extract compound preservatives (such as: chitosan derivatives, potassium sorbate compounded with citric acid), etc.; coupling agents include, but are not limited to: silane coupling agents (such as: γ-aminopropyltriethoxysilane, γ-methacryloyloxysilane). Trimethoxysilane), titanate coupling agents (such as isopropyltrioleoyloxytitanate), etc.; curing agents include but are not limited to: silicate adhesive curing agents (such as bauxite powder, magnesium oxide, magnesium hydroxide), phosphate adhesive curing agents (such as magnesium oxide, zinc oxide, sodium tripolyphosphate), etc.; high temperature and corrosion resistant reinforcing additives include but are not limited to: high temperature resistant fillers (such as zirconium oxide, silicon carbide, nano alumina, silica sol), functional ceramic powders (such as mullite powder, low melting point glass powder), etc.

[0011] The beneficial effects achieved by this invention patent are as follows: Using recycled alumina powder as the main component, the interaction between the hydroxyl groups on the alumina surface and water molecules in the environment promotes the hydrolysis-condensation reaction of the binder (silicates, phosphates, etc.) precursors, forming an inorganic gel network and achieving room temperature curing. After spraying onto the pouring surfaces of molten steel and aluminum, adhesion is significantly reduced, resulting in excellent product performance and particularly good on-site repair performance. The use of dispersants, thickeners, and rheology modifiers synergistically regulates the rheological properties of the anti-sticking coating, creating a "shear-thinning" flow pattern suitable for various application methods such as spraying, brushing, and dipping. During spraying, the viscosity drops sharply to achieve atomization, and after spraying, the viscosity recovers, making it particularly suitable for uniform film formation on complex-shaped furnace bodies, avoiding the problems of sagging or uneven drying found in traditional coatings. The recycled alumina in the formula, as well as the selected binders, thickeners, rheology modifiers, and other additives, do not contain volatile organic compounds such as benzene or formaldehyde. The product has no irritating odor during spraying and exhibits excellent environmental performance.

Claims

1. A coating for preventing slag adhesion based on recycled alumina powder, characterized in that, include: Recycled alumina powder, binders, dispersants, thickeners, rheology modifiers, and other additives.

2. The anti-slag-sticking coating based on recycled alumina powder according to claim 1, characterized in that: The recycled alumina powder accounts for 50%-80% of the total mass; the binder accounts for 10%-30% of the total mass; the dispersant accounts for 1%-5% of the total mass; and the thickener, rheology modifier, and other additives account for 0%-39% of the total mass.

3. The anti-slag-sticking coating based on recycled alumina powder according to claim 1, characterized in that: The adhesive is one or a combination of several of the following: water-based or solvent-based silicate, phosphate, or silane coupling agents.

4. The anti-slag-sticking coating based on recycled alumina powder according to claim 1, characterized in that: The dispersant is one or a combination of several polycarboxylate or polyether surfactants.

5. The anti-slag-sticking coating based on recycled alumina powder according to claim 1, characterized in that: The thickener and rheology modifier are one or a combination of several of the following: water-soluble polymeric thickeners and natural polysaccharide rheology modifiers.

6. The anti-slag-sticking coating based on recycled alumina powder according to claim 1, characterized in that: The other additives are one or a combination of several of the following: defoamers, preservatives, coupling agents, curing agents, and high-temperature and corrosion-resistant reinforcing additives.

7. The anti-slag-sticking coating based on recycled alumina powder according to claim 6, characterized in that: The defoamer is one or a combination of several of polyether-modified alcohols or polysiloxane-polyether copolymers; the preservative is one or a combination of several of isothiazolinone derivatives or natural extract compound preservatives; the coupling agent is one or a combination of several of silane coupling agents or titanate coupling agents; the curing agent is one or a combination of several of bauxite powder, magnesium oxide, magnesium hydroxide, zinc oxide, or sodium tripolyphosphate; and the high-temperature resistant and corrosion-resistant reinforcing agent is one or a combination of several of high-temperature resistant fillers or functional ceramic powders.