CN115321940B - Preparation method of modified sodium silicate combined white corundum sand mold - Google Patents
Preparation method of modified sodium silicate combined white corundum sand mold Download PDFInfo
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- CN115321940B CN115321940B CN202211027610.1A CN202211027610A CN115321940B CN 115321940 B CN115321940 B CN 115321940B CN 202211027610 A CN202211027610 A CN 202211027610A CN 115321940 B CN115321940 B CN 115321940B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention relates to a preparation method of a modified water glass combined white corundum sand mold, which belongs to the technical field of refractory material preparation and comprises the following steps: adding modified silicon carbide whiskers into water glass, performing ultrasonic dispersion, then adding potassium hydroxide and sodium carboxymethyl starch, and uniformly stirring to obtain modified water glass; step two, preparing raw materials: white corundum, modified water glass and curing agent; and thirdly, uniformly mixing the white corundum, the modified water glass and the curing agent, pouring the mixture into a die, standing at normal temperature for 15-30min, demolding, taking out to obtain a blank, and standing the obtained blank at normal temperature. According to the invention, the modified water glass is used as a binder, and the internal organic ester is used as a curing agent, so that the normal-temperature curing of the modified water glass combined with the white corundum sand mold is realized, the problem that the conventional water glass sand mold is difficult to cure at normal temperature is solved, and the production cost of the water glass sand mold is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of refractory material preparation, and particularly relates to a preparation method of a modified water glass combined white corundum sand mold.
Background
At present, two main manufacturing processes of a model for producing a fused cast aluminum oxide refractory material are respectively a traditional sodium silicate combined white corundum sand mould and a graphite plate model. The graphite plate model is formed by splicing the manufactured graphite plates into a casting cavity, then removing the graphite plates at high temperature after casting and forming, and the graphite plates can be reused for 2-3 times, and the maximum disadvantage of the model is that the cost is very high and is 5-7 times of that of a white corundum sand mould. The traditional sodium silicate sand mould is formed by mixing white corundum sand and sodium silicate, and then splicing and forming, and the manufacturing cost of the forming method is low. However, the cracking resistance of the traditional water glass combined with the white corundum sand mold is inferior to that of a graphite plate mold, and the traditional water glass combined with the white corundum sand mold has the defects of high energy consumption due to the fact that the traditional water glass is required to be baked at high temperature for molding.
Therefore, the low-cost, normal-temperature-cured and crack-resistant fused cast aluminum oxide refractory material is researched and is a technical problem to be solved in the field of the existing fused cast aluminum oxide refractory materials.
Disclosure of Invention
The invention aims to provide a preparation method of a modified water glass combined white corundum sand mold, which aims to solve the problems in the background technology.
The aim of the invention can be achieved by the following technical scheme:
the preparation method of the modified sodium silicate combined white corundum sand mold comprises the following steps:
step one, preparing raw materials: white corundum, modified water glass and a curing agent, wherein the addition amount of the modified water glass is 4.5-6% of the weight of the white corundum; the addition amount of the curing agent is 10-35% of the weight of the modified water glass;
and step two, uniformly mixing the white corundum, the modified water glass and the curing agent, pouring the mixture into a mold, standing for 15-30min at normal temperature, demolding, taking out to obtain a blank, and standing the obtained blank at normal temperature for 24-72h to obtain the modified water glass combined white corundum sand mold.
Further, the white corundum is formed by mixing two types of particles with the particle size of 60 meshes and 40 meshes according to any ratio, and the chemical composition of the white corundum requires: the content of Al2O3 is more than or equal to 98.5 percent, the content of Fe2O3 is less than or equal to 0.15 percent, and the content of Na2O is less than or equal to 0.5 percent.
Further, the modified water glass has the viscosity of 0-60mpa.s and the density of 1.4-1.6g/cm 3 。
Further, the curing agent is one or a mixture of two of glycerol acetate and ethylene glycol acetate in any ratio.
Further, the modified water glass is prepared from the following raw materials in parts by weight: 1-3 parts of potassium hydroxide, 1.5-3.5 parts of sodium carboxymethyl starch, 2-6.5 parts of modified silicon carbide whisker and 85-95 parts of water glass.
Further, the modified water glass comprises the following steps:
adding the modified silicon carbide whisker into water glass, performing ultrasonic dispersion for 20-40min, then adding potassium hydroxide and sodium carboxymethyl starch, and uniformly stirring to obtain the modified silicon carbide whisker.
Further, the modified silicon carbide whisker is prepared by the following steps:
firstly, soaking silicon carbide whiskers in 30wt% hydrofluoric acid solution for 24 hours, and then washing with deionized water for several times to obtain acid-treated silicon carbide whiskers, wherein the mass ratio of the silicon carbide whiskers to the 30wt% hydrofluoric acid solution is 1:15-20, and soaking the obtained acid-treated silicon carbide whiskers in 30wt% hydrogen peroxide for 40-70 minutes to obtain hydroxylated silicon carbide whiskers, wherein the mass ratio of the acid-treated silicon carbide whiskers to the 30wt% hydrogen peroxide is 1:15-20;
soaking the hydroxylated silicon carbide whisker into absolute ethyl alcohol, performing ultrasonic treatment for 10-15min, then adding sodium hydroxide to adjust the pH value of the solution to 10-11, heating to 60-65 ℃, adding an ethanol solution containing a grafting agent under stirring, performing heat preservation reaction for 12-16h, taking out the silicon carbide whisker, alternately washing with ethanol and deionized water, and drying to obtain the grafted silicon carbide whisker, wherein the mass ratio of the hydroxylated silicon carbide whisker to the grafting agent is 1:4-5;
in the reaction, hydroxyl groups on the surface of the hydroxylated silicon carbide whisker and epoxy groups in the grafting agent are utilized to react, so that the grafting agent is connected to the surface of the silicon carbide whisker, the grafting agent on the surface of the silicon carbide whisker contains hydroxyl groups, and the reaction can be continued and inherited with the free grafting agent, so that the surface of the silicon carbide whisker is coated with a layer of hyperbranched polymer formed by the grafting agent in a chemical bonding mode (one mole of grafting agent contains one mole of epoxy groups and two moles of hydroxyl groups and can be used as a self-polymerization reaction monomer);
thirdly, soaking the grafted silicon carbide whisker into absolute ethyl alcohol, carrying out ultrasonic treatment for 10-15min, then adding sodium hydroxide to adjust the pH value of the solution to 10-11, heating to 60-65 ℃, stirring, adding an ethanol solution containing sodium 2-hydroxy-3-chloropropane phosphate, carrying out heat preservation reaction for 12-16h, taking out the silicon carbide whisker, alternately washing with ethanol and deionized water, and drying to obtain the modified silicon carbide whisker, wherein the mass ratio of the grafted silicon carbide whisker to the sodium 2-hydroxy-3-chloropropane phosphate is 1:2-3.
In the reaction, chlorine groups in 2-hydroxyl-3-chloropropane phosphate sodium are utilized to react with hydroxyl groups on the surface of the grafted silicon carbide whisker, so that the grafted silicon carbide whisker introduces phosphate in a chemical bonding mode, a large number of sodium phosphate groups are connected to the surface of the silicon carbide whisker, and the modified silicon carbide whisker is obtained, and is known to be a silicon carbide whisker with a layer of hyperbranched polymer chains and sodium phosphate groups wrapped on the surface, and the hyperbranched polymer is a grafting agent (obtained by reacting trimethylolpropane triglycidyl ether and 3-amino-1.2-propanediol), and has good water solubility and hyperbranched structure, so that on one hand, the silicon carbide whisker is coarser, and can form a role with a white corundum base material in a subsequent curing process, and on the other hand, the hyperbranched polymer on the surface of the silicon carbide whisker has good water solubility characteristics, and a large number of cavities containing ether bonds, and sodium phosphate negative ions (the easy formation of sodium ions and the sodium phosphate negative ions), wherein the water solubility characteristics and the large number of the ether bonds are easy to form a good bond with silicon oxide bonds (the glass, and the silicon oxide bonds are easy to form a good bond with the glass, and the glass is more complex, and the water bonds are more easily formed in the cavity, and the glass is more well dispersed with the glass, and the water bonds are more well dispersed, and the glass is more easily formed in the cavity, and the cavity is more well dispersed and the glass is more easily and hardened; the introduced sodium phosphate (sodium ions and phosphate anion groups are easy to form), especially the phosphate anion groups, increase the concentration of negative charges in the water glass (polysilicic acid in the water glass is negatively charged), and improve the stability of the water glass.
Further, the grafting agent comprises the following steps:
uniformly mixing trimethylolpropane triglycidyl ether and absolute ethyl alcohol, heating to 60-65 ℃, slowly dropwise adding 3-amino-1.2-propylene glycol under stirring, continuously stirring for reaction for 6-10h after complete dropwise adding, cooling to room temperature, pouring the reaction solution into absolute ethyl ether for precipitation, filtering and drying to obtain a grafting agent, wherein the molar ratio of the trimethylolpropane triglycidyl ether to the 3-amino-1.2-propylene glycol is 1:2.
Further, the sodium 2-hydroxy-3-chloropropane phosphate is obtained by stirring and reacting sodium dihydrogen phosphate and epichlorohydrin serving as reaction substrates and water serving as a reaction solvent at the temperature of 85-90 ℃ and the pH value of the solution of 5-6 for 2-4 hours, wherein the molar ratio of the sodium dihydrogen phosphate to the epichlorohydrin is 1:1.
The invention has the beneficial effects that:
according to the invention, firstly, a mixture of 60-mesh and 40-mesh white corundum is taken as sand, so that the obtained mold has good air permeability and bonding strength, and meanwhile, modified water glass is taken as a binder and organic ester is taken as a curing agent, so that the normal-temperature curing of the modified water glass combined white corundum sand mold is realized, the problem that the conventional water glass sand mold is difficult to cure at normal temperature is solved, and the production cost of the water glass sand mold is greatly reduced; secondly, the modified silicon carbide whisker is introduced into the modified water glass, the cracking resistance of the mould is improved by utilizing the self anti-cracking capability of the silicon carbide whisker, the silicon carbide whisker is a silicon carbide whisker with a surface wrapped with a layer of hyperbranched polymer chains and sodium phosphate groups, has a rough surface structure, can be uniformly dispersed in the water glass by ultrasonic treatment, and carbonyl and amino contained on the surface of the silicon carbide whisker are easy to form complexation with metal in corundum, so that the combination of the water glass and the corundum is promoted, the hardening speed is accelerated, and the bonding strength of the water glass is improved; sodium phosphate (sodium ions and phosphate anion groups are easy to form) on the surface of the glass, especially the phosphate anion groups, so that the concentration of negative charges in the water glass is increased (polysilicic acid in the water glass is negatively charged), and the stability of the water glass is improved;
in conclusion, the preparation method of the modified water glass combined white corundum sand mold has the characteristic of normal-temperature curing, and the obtained mold has good crack resistance.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Preparation of grafting agent:
uniformly mixing 0.1mol of trimethylolpropane triglycidyl ether and 100mL of absolute ethyl alcohol, heating to 60 ℃, slowly dropwise adding 0.2mol of 3-amino-1.2-propanediol under stirring, continuously stirring for reaction for 10 hours after the dropwise adding is completed, cooling to room temperature, pouring the reaction solution into 200mL of absolute ethyl ether for precipitation, filtering and drying to obtain the grafting agent.
Example 2
Preparation of grafting agent:
uniformly mixing 0.1mol of trimethylolpropane triglycidyl ether and 100mL of absolute ethyl alcohol, heating to 65 ℃, slowly dropwise adding 0.2mol of 3-amino-1.2-propanediol under stirring, continuously stirring for reaction for 6 hours after the dropwise adding is completed, cooling to room temperature, pouring the reaction solution into 200mL of absolute ethyl ether for precipitation, filtering and drying to obtain the grafting agent.
Example 3
Preparation of modified silicon carbide whisker:
firstly, soaking 1g of silicon carbide whisker into 15g of 30wt% hydrofluoric acid solution for 24 hours, washing with deionized water for several times to obtain acid treated silicon carbide whisker, and soaking 1g of the obtained acid treated silicon carbide whisker into 15g of 30wt% hydrogen peroxide for 40 minutes to obtain hydroxylated silicon carbide whisker;
step two, soaking 10g of hydroxylated silicon carbide whisker into 40mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 10min, then adding sodium hydroxide to adjust the pH value of the solution to 10-11, heating to 60 ℃, adding 80mL of ethanol solution containing 40g of grafting agent prepared in the embodiment 1 under stirring, carrying out heat preservation reaction for 16h, taking out the silicon carbide whisker, alternately washing with ethanol and deionized water, and drying to obtain grafted silicon carbide whisker;
thirdly, soaking 10g of grafted silicon carbide whisker into 40mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 15min, then adding sodium hydroxide to adjust the pH value of the solution to 10-11, heating to 65 ℃, stirring, adding an ethanol solution containing 20g of 2-hydroxy-3-chloropropane sodium phosphate, carrying out heat preservation reaction for 16h, taking out the silicon carbide whisker, alternately washing with ethanol and deionized water, and drying to obtain modified silicon carbide whisker; the sodium 2-hydroxy-3-chloropropane phosphate is obtained by stirring and reacting sodium dihydrogen phosphate and epichlorohydrin serving as reaction substrates and water serving as a reaction solvent at the temperature of 85 ℃ and the pH value of a solution of 5-6 for 2 hours, wherein the molar ratio of the sodium dihydrogen phosphate to the epichlorohydrin is 1:1.
Example 4
Preparation of modified silicon carbide whisker:
firstly, 1g of silicon carbide whisker is soaked in 20g of 30wt% hydrofluoric acid solution for 24 hours, then deionized water is used for washing for a plurality of times to obtain acid treated silicon carbide whisker, and 1g of the obtained acid treated silicon carbide whisker is soaked in 20g of 30wt% hydrogen peroxide for 70 minutes to obtain hydroxylated silicon carbide whisker;
step two, soaking 10g of hydroxylated silicon carbide whisker into 40mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 15min, then adding sodium hydroxide to adjust the pH value of the solution to 10-11, heating to 65 ℃, adding 80mL of ethanol solution containing 50g of grafting agent prepared in the embodiment 2 under stirring, carrying out heat preservation reaction for 12h, taking out the silicon carbide whisker, alternately washing with ethanol and deionized water, and drying to obtain grafted silicon carbide whisker;
thirdly, soaking 10g of grafted silicon carbide whisker into 40mL of absolute ethyl alcohol, carrying out ultrasonic treatment for 15min, then adding sodium hydroxide to adjust the pH value of the solution to 10-11, heating to 65 ℃, stirring, adding an ethanol solution containing 30g of sodium 2-hydroxy-3-chloropropane phosphate, carrying out heat preservation reaction for 12h, taking out the silicon carbide whisker, alternately washing with ethanol and deionized water, and drying to obtain modified silicon carbide whisker; the sodium 2-hydroxy-3-chloropropane phosphate is obtained by stirring and reacting sodium dihydrogen phosphate and epichlorohydrin serving as reaction substrates and water serving as a reaction solvent for 4 hours at the temperature of 90 ℃ and the pH value of the solution of 5-6, wherein the molar ratio of the sodium dihydrogen phosphate to the epichlorohydrin is 1:1.
Example 5
The preparation method of the modified sodium silicate combined white corundum sand mold comprises the following steps:
adding 2 parts of modified silicon carbide whiskers prepared in example 3 into 85 parts of water glass, performing ultrasonic dispersion for 20min, then adding 1 part of potassium hydroxide and 1.5 parts of sodium carboxymethyl starch, and uniformly stirring to obtain modified water glass; the modified water glass has viscosity of 50mpa.s and density of 1.4-1.6g/cm 3 ；
Step two, preparing raw materials: white corundum, modified water glass and a curing agent, wherein the addition amount of the modified water glass is 4.5% of the weight of the white corundum; the adding amount of the curing agent is 20% of the weight of the modified water glass; the white corundum is formed by mixing two particles with the particle size of 60 meshes and 40 meshes according to the ratio of 2:3, and the chemical composition of the white corundum requires: 98.8% of Al2O3, 0.1% of Fe2O3 and 0.45% of Na 2O; the curing agent is glycerol acetate;
and thirdly, uniformly mixing the white corundum, the modified water glass and the curing agent, pouring the mixture into a mold, standing at normal temperature for 20min, demolding, taking out to obtain a blank, and standing the obtained blank at normal temperature for 60h to obtain the modified water glass combined white corundum sand mold.
Example 6
The preparation method of the modified sodium silicate combined white corundum sand mold comprises the following steps:
adding 4 parts of the modified silicon carbide whisker prepared in the embodiment 4 into 90 parts of water glass, performing ultrasonic dispersion for 30min, then adding 2 parts of potassium hydroxide and 2 parts of sodium carboxymethyl starch, and uniformly stirring to obtain modified water glass; the modified water glass has the viscosity of 0-60mpa.s and the density of 1.4-1.6g/cm 3 ；
Step two, preparing raw materials: white corundum, modified water glass and a curing agent, wherein the addition amount of the modified water glass is 5.5% of the weight of the white corundum; the adding amount of the curing agent is 25% of the weight of the modified water glass; the white corundum is formed by mixing two types of particles with the particle size of 60 meshes and 40 meshes according to the ratio of 7:3, and the chemical composition of the white corundum requires: 98.8% of Al2O3, 0.1% of Fe2O3 and 0.45% of Na 2O; the curing agent is ethylene glycol acetate;
and thirdly, uniformly mixing the white corundum, the modified water glass and the curing agent, pouring the mixture into a mold, standing at normal temperature for 30min, demolding, taking out to obtain a blank, and standing the obtained blank at normal temperature for 72h to obtain the modified water glass combined white corundum sand mold.
Example 7
The preparation method of the modified sodium silicate combined white corundum sand mold comprises the following steps:
adding 6.5 parts of the modified silicon carbide whisker prepared in the embodiment 3 into 95 parts of water glass, performing ultrasonic dispersion for 40min, then adding 3 parts of potassium hydroxide and 3.5 parts of sodium carboxymethyl starch, and uniformly stirring; obtaining modified water glass;
step two, preparing raw materials: white corundum, modified water glass and a curing agent, wherein the addition amount of the modified water glass is 6% of the weight of the white corundum; the adding amount of the curing agent is 35% of the weight of the modified water glass; the white corundum is formed by mixing two types of particles with the particle size of 60 meshes and 40 meshes according to a ratio of 3:2, and the chemical composition of the white corundum requires: the content of l2O3 is 98.8%, the content of Fe2O3 is 0.1%, and the content of Na2O is 0.45%; the curing agent is composed of glycerol acetate and ethylene glycol acetate in a mass ratio of 1:1;
and thirdly, uniformly mixing the white corundum, the modified water glass and the curing agent, pouring the mixture into a mold, standing at normal temperature for 15min, demolding, taking out to obtain a blank, and standing the obtained blank at normal temperature for 48h to obtain the modified water glass combined white corundum sand mold.
Comparative example 1
The preparation method of the modified sodium silicate combined white corundum sand mold comprises the following steps: in comparison with example 5, the same amount of modified silicon carbide whiskers in the modified water glass was replaced with silicon carbide whiskers, and the rest was the same.
Comparative example 2
The preparation method of the modified sodium silicate combined white corundum sand mold comprises the following steps: in comparison with example 6, the same amount of modified silicon carbide whiskers in the modified water glass was replaced with sodium polyacrylate, and the rest was the same.
Example 8
The physical and chemical properties of the molds obtained in examples 5 to 7 and comparative examples 1 to 2 were measured, and the data obtained are shown in Table 1.
TABLE 1
As can be seen from the data in Table 1, the bulk density, room temperature compressive strength of the molds obtained in examples 5 to 7 were superior to those of the molds obtained in comparative examples 1 to 2.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (4)
1. A preparation method of a modified water glass combined white corundum sand mold is characterized by comprising the following steps: the method comprises the following steps:
adding 2-6.5 parts of modified silicon carbide whisker into 85-95 parts of water glass, performing ultrasonic dispersion for 20-40min, then adding 1-3 parts of potassium hydroxide and 1.5-3.5 parts of carboxymethyl starch sodium, and uniformly stirring to obtain modified water glass;
step two, preparing raw materials: white corundum, modified water glass and a curing agent, wherein the addition amount of the modified water glass is 4.5-6% of the weight of the white corundum; the addition amount of the curing agent is 10-35% of the weight of the modified water glass;
uniformly mixing white corundum, modified water glass and a curing agent, pouring the mixture into a mold, standing at normal temperature for 15-30min, demolding, taking out to obtain a blank, and standing the obtained blank at normal temperature for 24-72h to obtain a modified water glass combined white corundum sand mold;
the white corundum is formed by mixing white corundum with 60-mesh and 40-mesh particle sizes according to any ratio, and the chemical components of the white corundum are as followsAnd (3) solving: al (Al) 2 O 3 The content is more than or equal to 98.5 percent, fe 2 O 3 The content is less than or equal to 0.15 percent, na 2 The O content is less than or equal to 0.5 percent;
the modified silicon carbide whisker is prepared by the following steps:
firstly, soaking hydroxylated silicon carbide whiskers into absolute ethyl alcohol, performing ultrasonic treatment for 10-15min, then adding sodium hydroxide to adjust the pH value of a solution to 10-11, heating to 60-65 ℃, adding an ethanol solution containing a grafting agent under stirring, performing heat preservation reaction for 12-16h, taking out the silicon carbide whiskers, alternately washing with ethanol and deionized water, and drying to obtain grafted silicon carbide whiskers;
secondly, soaking the grafted silicon carbide whisker into absolute ethyl alcohol, carrying out ultrasonic treatment for 10-15min, then adding sodium hydroxide to adjust the pH value of the solution to 10-11, heating to 60-65 ℃, adding an ethanol solution containing sodium 2-hydroxy-3-chloropropane phosphate under stirring, carrying out heat preservation reaction for 12-16h, taking out the silicon carbide whisker, alternately washing with ethanol and deionized water, and drying to obtain the modified silicon carbide whisker;
the grafting agent comprises the following steps:
and (3) uniformly mixing trimethylolpropane triglycidyl ether and absolute ethyl alcohol, heating to 60-65 ℃, slowly dropwise adding 3-amino-1.2-propylene glycol under stirring, continuously stirring for reaction for 6-10h after the dropwise adding is completed, cooling to room temperature, pouring the reaction solution into absolute ethyl ether for precipitation, filtering and drying to obtain the grafting agent.
2. The method for preparing the modified water glass combined white corundum sand mold, as set forth in claim 1, characterized in that: in the first step, the mass ratio of the hydroxylated silicon carbide whisker to the grafting agent is 1:4-5.
3. The method for preparing the modified water glass combined white corundum sand mold, as set forth in claim 1, characterized in that: in the second step, the mass ratio of the silicon carbide whisker and the 2-hydroxy-3-chloropropane sodium phosphate is 1:2-3.
4. The method for preparing the modified water glass combined white corundum sand mold, as set forth in claim 1, characterized in that: the molar ratio of the trimethylolpropane triglycidyl ether to the 3-amino-1.2-propanediol is 1:2.
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