CN114574009B - All-inorganic non-aluminum-sticking environment-friendly zirconium silicate coating and preparation method thereof - Google Patents

All-inorganic non-aluminum-sticking environment-friendly zirconium silicate coating and preparation method thereof Download PDF

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CN114574009B
CN114574009B CN202210223826.9A CN202210223826A CN114574009B CN 114574009 B CN114574009 B CN 114574009B CN 202210223826 A CN202210223826 A CN 202210223826A CN 114574009 B CN114574009 B CN 114574009B
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zirconium silicate
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aluminum
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CN114574009A (en
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韩学强
何胜平
刘小团
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Sino Foundry Refractory Jiangsu Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/20—Diluents or solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic

Abstract

The invention discloses an all-inorganic non-aluminum-sticking environment-friendly zirconium silicate coating and a preparation method thereof, the invention adopts low-price zirconium silicate as a main raw material, and adds auxiliary materials such as fumed silica and the like to prepare the zirconium silicate coating which has low price, good aluminum sticking resistance and chemical corrosion resistance, overcomes the defects of high price and low cost performance of boron nitride coating, has the performances of the boron nitride coating, and can be applied to local zirconium silicate coating which can be applied by the boron nitride coating.

Description

All-inorganic non-stick aluminum environment-friendly zirconium silicate coating and preparation method thereof
Technical Field
The invention relates to the technical field of aluminum casting coatings, in particular to an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating and a preparation method thereof.
Background
In the aluminum casting process, high-temperature molten aluminum at about 750 ℃ needs to flow through a series of assemblies with refractory lining launders, filter boxes, automatic pouring spoons and the like, and the high-temperature molten aluminum has strong reducibility, permeability, thermal shock, adhesiveness and continuous scouring property, so that the refractory lining contacted with the high-temperature molten aluminum is inevitably damaged, the service life of the whole assembly is shortened and damaged, and the production cost is improved.
At present, a widely adopted method for prolonging the service life of a refractory lining and preventing aluminum water from adhering to the refractory lining is to brush or spray a boron nitride coating on the surface of the refractory lining, and the boron nitride coating has the properties of no infiltration by the aluminum water, extremely low expansion rate, lubricity, no reduction by the aluminum water and the like, so that the application prospect of the boron nitride coating in the field is good by the industry.
However, boron nitride coatings, while excellent in performance, have two very significant drawbacks: firstly, the cost is too high, because the boron nitride raw material is a high-temperature synthetic raw material, the boron nitride of all crystal types is not suitable for preparing the boron nitride coating, and the boron nitride with low purity cannot be used for the boron nitride coating, the cost of the synthetic boron nitride raw material is very high, the high-quality boron nitride raw material in the market is generally more than 200-300 yuan/kg, and the price of the boron nitride coating is high; secondly, the boron nitride coating in the prior art contains substances such as organic solvents, organic thickeners, organic film forming agents and organic antifoaming agents to different degrees, carbon emission and volatilization and emission of harmful substances can be generated in the brushing or spraying operation, drying and working processes, and the boron nitride coating does not accord with the scientific development concept and national policies of low carbon and environmental protection.
Disclosure of Invention
The invention aims to provide an all-inorganic non-stick aluminum environment-friendly zirconium silicate paint and a preparation method thereof, which aim to solve the problems that the existing boron nitride paint proposed in the background art has excellent performance, but the cost for using the boron nitride paint is too high, and the boron nitride paint contains organic solvents, organic thickeners, organic film forming agents, organic antifoaming agents and other substances to different degrees, and has carbon emission and volatilization and emission of harmful substances in the brushing or spraying operation, drying and working processes.
In order to achieve the purpose, the invention adopts the technical scheme that:
an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating comprises the following components in parts by weight:
zirconium silicate: 20-30 parts;
fumed silica: 0.4-0.8 part;
talc powder: 5-8 parts;
thickening agent: 5-7 parts;
film forming agent: 5-15 parts;
surfactant (b): 0.5-1.5 parts;
water: 50-60 parts.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the zirconium silicate contains 64-67% of zirconium oxide, 0-0.1% of titanium oxide and 0-0.1% of iron oxide, the zirconium silicate is 5000-mesh micro powder, and the whiteness of the zirconium silicate is not lower than 65%.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the content of silicon oxide in fumed silica is not less than 99.8%, the content of ferric oxide in fumed silica is not more than 0.02%, and the specific surface area of the fumed silica is 350-410m < 2 >/g.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the content of magnesium oxide in the talcum powder is 30-32%, the content of ferric oxide in the talcum powder is 0-0.02%, the talcum powder is 600-mesh fine powder, and the whiteness of the talcum powder is not lower than 80%.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the thickening agent is modified bentonite with the particle size of 325 meshes, the thickening agent contains 63.5-67.5% of silicon dioxide, 12-15% of aluminum oxide, 0-0.09% of titanium oxide, 0-0.9% of iron oxide, 2.4-3.4% of sodium oxide, and the whiteness of the thickening agent modified bentonite is not lower than 65%.
According to the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the film forming agent is silicon-aluminum sol, and the silicon-aluminum sol is prepared by compounding nanoscale aluminum sol and silica sol according to the proportion of 3;
the PH value of the silica sol is 2.0-4.0, the content of silica in the silica sol is 25-30%, and the micelle diameter of the silica sol is 8-20nm;
the pH value of the aluminum sol is 2.0-4.0, the content of aluminum oxide in the aluminum sol is 15-25%, and the micelle diameter of the aluminum sol is 20-50nm.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the surfactant is sodium hexametaphosphate, and the purity of the sodium hexametaphosphate is not lower than 99%.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the water is softened water or purified water.
A preparation method of an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating comprises the following steps:
step (A), in the batching stage, the following components and the parts by weight of the components are prepared: zirconium silicate: 20-30 parts of fumed silica: 0.4-0.8 part, talcum powder: 5-8 parts of a thickening agent: 5-7 parts of a film forming agent: 5-15 parts of surfactant: 0.5-1.5 parts of water: 50-60 parts;
step (B), in the material preparation stage, water and a film-forming agent are uniformly mixed to obtain a glue solution raw material, and the rest components are powder raw materials;
step (C), in the dry mixing stage, adding the powder raw materials into a dispersion machine in sequence, starting the equipment, regulating and controlling the dispersion machine to enable the dispersion machine to run at a low speed, and dry mixing the powder raw materials;
step (D), in the wet mixing stage, after the powder raw materials are dry-mixed for 3-5 minutes, adding the glue solution raw materials into a dispersion machine, continuously stirring, and regulating and controlling the dispersion machine to operate at a high speed after the mixture in the dispersion machine is stirred to form paste;
and (E) in a discharging stage, discharging after the mixture in the dispersing machine is uniformly dispersed, and obtaining the zirconium silicate coating.
In the preparation method of the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the rotation speed of the dispersion machine in low-speed operation is 20-70RPM, and the rotation speed of the dispersion machine in high-speed operation is 1200-1500RPM.
The invention has the beneficial effects that:
1. the invention adopts cheap zirconium silicate as the main raw material, and adds the auxiliary materials such as gas-phase silicon dioxide and the like to prepare the zirconium silicate coating with low price, good aluminum adhesion resistance and chemical corrosion resistance, overcomes the defects of high price and low cost performance of the existing boron nitride coating, and has the performance of the boron nitride coating, and the zirconium silicate coating which can be applied to the boron nitride coating can also be applied;
2. the zirconium silicate, the fumed silica, the talcum powder, the thickening agent, the film forming agent and the surfactant are all inorganic materials, the carrier is water, and the raw materials and the additives in the ingredients are not decomposed into harmful substances when heated and are not volatilized after being placed for a long time, so that carbon emission and volatilization and emission of the harmful substances are not generated in the processes of brushing, drying and working, and the environment protection is facilitated;
3. compared with the traditional boron nitride coating, the zirconium silicate coating has the advantages of low cost and high cost performance, and has the performances of the boron nitride coating, and the specific performances are shown in the following aspects:
a. the zirconium silicate material has good chemical stability, so that the zirconium silicate coating can resist the chemical erosion and reducibility of molten aluminum;
b. the particle density of the zirconium silicate material reaches 4.0g/cm 3 In the above-mentioned manner,the texture is hard, so that the zirconium silicate coating has stronger aluminum water scouring resistance;
c. the zirconium silicate material has a low coefficient of thermal expansion, and an average linear coefficient of thermal expansion of 5.0 x 10 -6 The coating material is introduced with low expansion material fumed silica, and the average linear thermal expansion coefficient is 0.5 multiplied by 10 -6 The temperature is lower than the melting point of the zirconium silicate, so that the zirconium silicate coating has excellent stability and thermal shock resistance;
d. the zirconium silicate material has the property of not being soaked by the aluminum water, and the performance of not being easily soaked by the aluminum water is given to the coating;
4. according to the invention, the fumed silica is introduced as a rheological additive and an anti-settling agent, so that the low shear viscosity of the coating is improved, the stability of the coating system is ensured, the coating can be stored for a long time, the advantages of the fumed silica and the modified bentonite are complementary, the rheological property of the water-based coating system is adjusted through the introduction of the fumed silica, the storage performance can be ensured, the coating requirement of the coating can be met, and the coating has excellent stability, leveling property and anti-sagging property during construction.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention relates to an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, which comprises the following components in parts by weight:
zirconium silicate: 20-30 parts of a solvent;
fumed silica: 0.4-0.8 part;
talc powder: 5-8 parts;
thickening agent: 5-7 parts;
film-forming agent: 5-15 parts;
surfactant (b): 0.5-1.5 parts;
water: 50-60 parts.
In the fully inorganic non-stick aluminum environment-friendly zirconium silicate coating, the zirconium silicate contains 64-67% of zirconium oxide, 0-0.1% of titanium oxide, 0-0.1% of iron oxide and 5000-mesh micro powder of zirconium silicate, the whiteness of the zirconium silicate is not less than 65%, the performance of the zirconium silicate coating is mainly determined by the zirconium silicate, the higher the content of zirconium oxide is, the higher the purity of zirconium silicate is, the performance of the coating can be ensured, the titanium oxide and the iron oxide are impurities, the lower the content of impurities is, the purer the zirconium silicate is, and the whiteness is correspondingly improved.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the content of silicon oxide in fumed silica is not less than 99.8 percent, the content of ferric oxide is not more than 0.02 percent, and the specific surface area of the fumed silica is 350-410m < 2 >/g;
wherein, the fumed silica is hydrophilic fumed silica, and the introduction of the fumed silica mainly has the following purposes:
1. as rheological additives
The surface of the gas-phase silicon dioxide has a large number of silicon hydroxyls, the silicon hydroxyls can form hydrogen bonding action among the silicon dioxide to form a silicon dioxide network, the silicon hydroxyls can also form hydrogen bonding action with a carrier, and the carrier is water or an organic solvent, so that an interpenetrating network between the silicon dioxide and the carrier is formed in the system, and good thickening property is presented; the hydrogen bond and physical adsorption acting force forming the network are relatively weak acting forces, so that the network is easily destroyed and the medium becomes thin under the action of external force, so that the viscosity of the system is rapidly reduced, once the external force is eliminated, the network is rapidly recovered, the viscosity of the system is rapidly increased, and good thixotropy is presented, and the thixotropy is reversible;
on one hand, in the construction process, the solvent or water at the edge of the coating is volatilized quickly, so that the surface tension is uneven, the coating is easy to move towards the edge, the silica network can effectively prevent the coating from moving to form an edge, and meanwhile, the sagging phenomenon of the coating in the curing process can be prevented, so that the coating is even, and on the other hand, the fumed silica can form a hydrogen bond to improve the medium-low shear viscosity of the system, play a role in thickening and generate the thixotropic phenomenon;
2. as an anti-settling agent
The fumed silica is nano amorphous silica with extremely fine particle size, the primary particle size is 7-40nm, the aggregate particle size is about 200-500nm, the specific surface area is large, silanol groups are arranged on the surface, the silanol groups can interact with adjacent fumed silica particles to form hydrogen bonds, the hydrogen bonds enable the fumed silica to form a thixotropic structure, the suspension effect of the fumed silica is generated by forming a network structure when the fumed silica is dispersed in a solution, the network structure enables the particles in the system not to be easily agglomerated and subjected to phase separation, meanwhile, the viscosity of the system is improved, the motion of each component in the system is prevented, and the anti-settling effect is very beneficial to paint storage;
3. gas phase silicon dioxide and modified bentonite have complementary advantages
Hydrophilic montmorillonite in the modified bentonite is wetted by water and then expands, so that the coating has thixotropy and cohesiveness, although the suspension property of the coating using the bentonite is relatively stable, the expansion property of the coating is gradually reduced along with the time, the phenomenon is particularly obvious when the coating is diluted for use, other auxiliary thickeners such as cellulose ether and the like are often required to be matched to strengthen the network structure of the coating to ensure the stability of rheological property, meanwhile, the cohesiveness of the bentonite enables the viscosity of the coating to be high, the leveling time is prolonged, dripping and sagging during dip coating are caused, the introduction of fumed silica can adjust the rheological property of a water-based coating system, the storage property can be ensured, the coating requirement of the coating can be met, and the coating has excellent stability, leveling property and sagging resistance during construction.
The addition amount of the fumed silica in the coating is generally not more than 1%, the fumed silica has large specific surface area and high surface energy and is easy to agglomerate, if the addition amount is too large, the agglomerates are difficult to disperse uniformly, the dispersion efficiency and the coating quality are influenced, and the particle size of the fumed silica is very small, so that the air permeability of the coating can be greatly reduced after the coating is coated, and the defects of peeling, cracking and the like are caused.
In the inorganic non-stick aluminum environment-friendly zirconium silicate coating, the content of magnesium oxide in talcum powder is 30-32%, the content of iron oxide in talcum powder is 0-0.02%, the talcum powder is 600-mesh fine powder, the whiteness of the talcum powder is not lower than 80%, the talcum powder is a layered structure mineral raw material and has smooth feel, a coating can have smooth feel after the coating is brushed, the requirements on the content of magnesium oxide and the content of impurities are set, and the purity of the talcum powder is mainly controlled, so that the performance and the whiteness of the talcum powder are improved.
The thickener is modified bentonite with the granularity of 325 meshes, the content of silicon dioxide in the thickener is 63.5-67.5%, the content of aluminum oxide is 12-15%, the content of titanium oxide is 0-0.09%, the content of iron oxide is 0-0.9%, the content of sodium oxide is 2.4-3.4%, the whiteness of the thickener modified bentonite is not lower than 65%, the modified bentonite has a layered structure, the interlayer spacing is only dozens of nanometers, a network structure can be formed after the modified bentonite is dispersed in water, the viscosity of the paint is reduced when the paint is sheared and the original viscosity of the paint can be restored after the shearing is stopped during thickening, so that the problem of poor thixotropy caused by the use of the organic thickener is solved, a water-based paint system can keep good suspension and anti-settling performance, the problems of layering and water precipitation of products in production, transportation and storage can be solved, good thixotropy performance caused by lacing can be realized, the levelability and sagging performance of the paint during construction can be improved, and the whiteness of the thickener can be ensured by low impurity content.
According to the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, a film forming agent is silicon-aluminum sol, and the silicon-aluminum sol is prepared by compounding nanoscale aluminum sol and silica sol according to a proportion of 3;
the pH value of the silica sol is 2.0-4.0, the content of silica in the silica sol is 25-30%, and the micelle diameter of the silica sol is 8-20nm;
the pH value of the aluminum sol is 2.0-4.0, the content of aluminum oxide in the aluminum sol is 15-25%, and the micelle diameter of the aluminum sol is 20-50nm;
wherein the silica sol is a nontoxic and odorless colloidal solution, has very low viscosity, can permeate places where water can permeate, has excellent dispersibility and permeability when being mixed with other components, has a pH value of 2.0-4.0, contains 25-30% of silica in the silica sol, and has a micelle diameter of 8-20nm; when the silica sol loses moisture, monomer silicic acid is gradually polymerized into high polymer silica gel, and colloid molecules are enlarged along with the evaporation of the moisture to finally form a-SIO-O-SIO-coating film: because the content of Na2O in the silica sol is low, the silica sol has an irreversible film-forming characteristic, a coating film is compact and hard, and the water resistance and the heat resistance of the coating film are obviously superior to those of organic coatings;
the alumina sol is a semitransparent viscous colloid, the microstructure of the colloidal particle is feather-shaped, has positive charge, is non-toxic, odorless, non-volatile and non-flammable, and generates active alumina or high-purity alumina after high-temperature dehydration, the pH value is 2.0-4.0, the content of the alumina in the alumina sol is 15-25%, and the micelle diameter of the alumina sol is 20-50nm; the aluminum sol has the characteristics of adhesiveness, thixotropy, easy dispersibility, water solubility reversibility, stability and the like;
the aluminum sol compound film forming agent has the advantages over the single aluminum sol film forming agent:
1. the aluminum sol has high viscosity and excellent film forming performance, but has low bonding strength; in addition, the coating can be damaged due to the reversibility of water or damp after the aluminum sol is formed into a film, and the stability of the coating can be ensured only by heating to more than 150 ℃ for drying;
2. the silica sol has very low viscosity and good permeability, an intermediate layer is easily formed between the refractory base material and the coating, the coating and the base material are firmly combined, when the water of the silica sol is evaporated, colloidal particles are firmly attached to the surface of an object, and silica bonding is formed among the particles, so that the silica sol is a good adhesive, the adhesive strength is high, the film forming performance is good, the formed film is compact and high in hardness, and the silica sol is irreversible when meeting water, but the volume shrinkage is large in the film forming process after water loss at normal temperature, and the film is easy to crack.
3. The aluminum sol and the acidic silica sol can be mixed in any ratio, and after compounding, the film-forming property can ensure the film-forming strength and improve the water resistance, and meanwhile, the coating and the base material are firmly combined, so that the service life of the coating can be prolonged, and the consumption of the coating can be reduced.
In the all-inorganic non-aluminum-sticking environment-friendly zirconium silicate coating, the surfactant is sodium hexametaphosphate, the purity of the sodium hexametaphosphate is not less than 99 percent, and the high-purity sodium hexametaphosphate ensures that the coating can better play a role in wetting and dispersing powder particles such as zirconium silicate and the like.
In the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, water is distilled water or purified water so as to ensure that the content of impurity ions such as calcium, magnesium and the like in the water is very low, the stability of silica-alumina sol micelle particles is not influenced, and a coating system is more stable.
The invention relates to a preparation method of an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, which comprises the following steps:
step (A), in the burdening stage, the following components are prepared and the weight parts of the components are as follows: zirconium silicate: 20-30 parts of fumed silica: 0.4-0.8 part, talcum powder: 5-8 parts of a thickening agent: 5-7 parts of a film forming agent: 5-15 parts of surfactant: 0.5-1.5 parts of water: 50-60 parts;
step (B), in the material preparation stage, water and a film-forming agent are uniformly mixed to obtain a glue solution raw material, and the rest components are powder raw materials;
step (C), in the dry mixing stage, adding the powder raw materials into a dispersion machine in sequence, starting the equipment, regulating and controlling the dispersion machine to enable the dispersion machine to run at a low speed, and dry mixing the powder raw materials;
step (D), in the wet mixing stage, after the powder raw materials are dry-mixed for 3-5 minutes, adding the glue solution raw materials into a dispersion machine, continuously stirring, and regulating and controlling the dispersion machine to operate at a high speed after the mixture in the dispersion machine is stirred into a paste;
and (E) in a discharging stage, discharging after the mixture in the dispersing machine is uniformly dispersed, and obtaining the zirconium silicate coating.
In the preparation method of the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, the rotating speed of the dispersion machine in low-speed operation is 20-70RPM, and the rotating speed of the dispersion machine in high-speed operation is 1200-1500RPM.
Example one
The invention relates to an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, which is specifically implemented by the following components in parts by weight:
preparing the following components in parts by weight: zirconium silicate: 26.6 parts, fumed silica: 0.4 part, talc powder: 5 parts of a thickening agent: 6 parts of film forming agent: 5 parts, surfactant: 0.5 part, water: 56.5 parts of zirconium silicate paint prepared by the preparation method;
example two
The invention relates to an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, which is specifically implemented by the following components in parts by weight:
preparing the following components in parts by weight: zirconium silicate: 22.3 parts, fumed silica: 0.6 part, talcum powder: 7 parts of a thickening agent: 5 parts of a film forming agent: 14.3 parts, surfactant: 0.8 part, water: 50 parts of zirconium silicate paint is prepared according to the preparation method of the invention;
EXAMPLE III
The invention relates to an all-inorganic non-stick aluminum environment-friendly zirconium silicate coating, which is specifically implemented by the following components in parts by weight:
preparing the following components in parts by weight: zirconium silicate: 20 parts, fumed silica: 0.8 part, talc powder: 8 parts of a thickening agent: 7 parts of a film forming agent: 10 parts, surfactant: 1.2 parts of water: 53 parts of zirconium silicate paint is prepared according to the preparation method of the invention;
the performance data of the zirconium silicate coatings prepared in examples one, two and three are compared as shown in table 1:
TABLE 1 Performance data for the coatings prepared in the examples
Figure BDA0003534830450000111
The zirconium silicate coating obtained in the first, second and third embodiments can meet the use requirements, and no obvious difference exists in field application, but the density and viscosity of the zirconium silicate coating in the first embodiment are excellent, so that the zirconium silicate coating prepared in the first embodiment has more excellent performance.
In conclusion, the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating and the preparation method thereof provided by the invention have the advantages that the zirconium silicate coating prepared by taking zirconium silicate as a main raw material and adding auxiliary materials such as fumed silica and the like has good thermal stability, aluminum water scouring resistance, no aluminum water infiltration and good erosion resistance, can provide the performances of a boron nitride coating, and has much lower cost and cost performance than the boron nitride coating; in addition, the zirconium silicate, the fumed silica, the talcum powder, the thickening agent, the film forming agent and the surfactant are all inorganic materials, so that the zirconium silicate coating is free from carbon emission, volatilization and harmful gas emission in the brushing or spraying operation, drying and working processes, and has the outstanding performance of low carbon and environmental protection.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. An all-inorganic non-stick aluminum environment-friendly zirconium silicate coating is characterized by comprising the following components in parts by weight:
zirconium silicate: 20-30 parts;
fumed silica: 0.4-0.8 part;
talc powder: 5-8 parts;
thickening agent: 5-7 parts;
film-forming agent: 5-15 parts;
surfactant (b): 0.5-1.5 parts;
water: 50-60 parts;
the zirconium silicate comprises 64-67% of zirconium oxide, 0-0.1% of titanium oxide and 0-0.1% of iron oxide, the zirconium silicate is 5000-mesh micro powder, and the whiteness of the zirconium silicate is not lower than 65%;
the content of silicon oxide in the fumed silica is not less than 99.8 percent, the content of ferric oxide in the fumed silica is not more than 0.02 percent, and the specific surface area of the fumed silica is 350-410m 2 /g；
The thickening agent is modified bentonite with the granularity of 325 meshes, the thickening agent contains 63.5-67.5% of silicon dioxide, 12-15% of aluminum oxide, 0-0.09% of titanium oxide, 0-0.9% of ferric oxide and 2.4-3.4% of sodium oxide, and the whiteness of the thickening agent modified bentonite is not lower than 65%;
the film forming agent is silicon-aluminum sol, and the silicon-aluminum sol is prepared by compounding nanoscale aluminum sol and silica sol according to the proportion of 3;
the pH value of the silica sol is 2.0-4.0, the content of silicon oxide in the silica sol is 25-30%, and the micelle diameter of the silica sol is 8-20nm;
the pH value of the aluminum sol is 2.0-4.0, the content of aluminum oxide in the aluminum sol is 15-25%, and the micelle diameter of the aluminum sol is 20-50nm.
2. The all-inorganic non-stick aluminum environment-friendly zirconium silicate coating as claimed in claim 1, wherein the talc powder contains 30-32% of magnesium oxide and 0-0.02% of iron oxide, the talc powder is 600 mesh fine powder, and the whiteness of the talc powder is not less than 80%.
3. The all-inorganic non-stick aluminum environment-friendly zirconium silicate paint as claimed in claim 1, wherein the surfactant is sodium hexametaphosphate, and the purity of the sodium hexametaphosphate is not less than 99%.
4. The all-inorganic non-stick aluminum environment-friendly zirconium silicate paint as claimed in claim 1, wherein the water is distilled water or purified water.
5. The preparation method of the all-inorganic non-stick aluminum environment-friendly zirconium silicate coating as claimed in claim 1, characterized by comprising the following steps:
step (A), in the batching stage, the following components and the parts by weight of the components are prepared: zirconium silicate: 20-30 parts of fumed silica: 0.4-0.8 part, talcum powder: 5-8 parts of a thickening agent: 5-7 parts of a film forming agent: 5-15 parts of surfactant: 0.5-1.5 parts of water: 50-60 parts;
step (B), in the material preparation stage, water and a film-forming agent are uniformly mixed to obtain a glue solution raw material, and the rest components are powder raw materials;
step (C), in a dry mixing stage, sequentially adding the powder raw materials into a dispersion machine, starting equipment, regulating and controlling the dispersion machine to operate at a low speed, and performing dry mixing on the powder raw materials;
step (D), in the wet mixing stage, after the powder raw materials are dry-mixed for 3-5 minutes, adding the glue solution raw materials into a dispersion machine, continuously stirring, and regulating and controlling the dispersion machine to operate at a high speed after the mixture in the dispersion machine is stirred into a paste;
and (E) in a discharging stage, discharging after the mixture in the dispersing machine is uniformly dispersed, and obtaining the zirconium silicate coating.
6. The method for preparing the all-inorganic non-stick aluminum environment-friendly zirconium silicate paint as claimed in claim 5, wherein the rotation speed of the dispersion machine in low speed operation is 20-70RPM, and the rotation speed of the dispersion machine in high speed operation is 1200-1500RPM.
CN202210223826.9A 2022-03-07 2022-03-07 All-inorganic non-aluminum-sticking environment-friendly zirconium silicate coating and preparation method thereof Active CN114574009B (en)

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US10590283B2 (en) * 2016-08-12 2020-03-17 Magneco/Metrel, Inc. Method of providing a protective coating composition for molten aluminum and alkali metal environments
US10233335B2 (en) * 2016-08-12 2019-03-19 Magneco/Metrel, Inc. Protective coating composition for molten aluminum and alkali metal environments
CN108276012A (en) * 2018-03-15 2018-07-13 艾文斯（焦作）冶金材料有限责任公司 It is a kind of not glue aluminium paint for casting industry

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