A ceramic body reinforcing agent and a method for preparing the same

Abstract

The application relates to the technical field of ceramic industry, and provides a ceramic body reinforcing agent and a preparation method thereof.The ceramic body reinforcing agent comprises the following raw materials in parts by weight: 10-22 parts of a polydopamine modified bentonite-polyphosphate calcium composite material, 6-15 parts of a lignin modified inorganic particle, 5-12 parts of sepiolite powder, 3-10 parts of an inorganic binder, and 0.1-2 parts of a sodium lithium magnesium silicate salt; the polydopamine modified bentonite-polyphosphate calcium composite material is generated by the reaction of bentonite, nanometer silicon dioxide, a hydrocarbyl sulfonate, dopamine hydrochloride, aluminum chloride and polyphosphate calcium; and the lignin modified inorganic particle is generated by the reaction of an inorganic particle and alkali lignin.The ceramic body reinforcing agent has the advantages of small use amount and great enhancement of the structure strength of the body, and can greatly improve the strength of the ceramic body without affecting the fluidity of the slurry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic industry, in particular to a ceramic body enhancer and a preparation method thereof. BACKGROUND

[0002] Clay is one of the main raw materials in ceramic production, which not only provides the necessary components for ceramics, but also provides the forming performance of plasticity to the body. Clay is used as the main raw material of ceramic products because of its plasticity and sintering property. However, clay increases the burning loss of the formula, which not only restricts the shortening of the firing period, but also increases the emission of flue gas, bringing great pressure to the environmental protection production of building ceramics. Due to the non-renewability of high-quality clay, the flowability and plasticity of the body material must be ensured, and in addition to the thinning of ceramic products, more clay with high friability is used in the production process of ceramics, which leads to the decrease of the dry strength of ceramic body, resulting in cracks, angle defects and edge defects in the produced products. After the wall thickness of the ceramic body is thinned, the breaking load will decrease rapidly and the deformation degree will increase significantly, so that the yield rate is seriously reduced, which affects the production of ceramic products.

[0003] The body enhancer should greatly enhance the dry body strength, improve the flowability of the powder and the bonding property of the powder without affecting the performance of the body, and ultimately improve the yield rate and quality of the product. The body enhancer can be divided into organic type ceramic tile body enhancer, such as PVA (polyvinyl alcohol), CMC (carboxymethyl cellulose), modified starch, sodium polyacrylate, modified polysaccharide, polyacrylate, lignin and the like; inorganic type ceramic tile body enhancer, such as water glass, phosphate, bentonite, humic acid sodium, lignosulfonate, alkali lignin and the like; and organic-inorganic composite enhancer. The commonly used lignin and carboxymethyl cellulose sodium (CMC) body enhancer has the defect of seriously affecting the flowability of the slurry, and needs to add a deflocculating agent to reduce the viscosity of the slurry and reduce the water content of the slurry, which is troublesome. SUMMARY

[0004] The present application aims to solve at least one of the above technical problems, and provides a ceramic body enhancer with small dosage, high green body strength and good slurry flowability, and a preparation method thereof.

[0005] In one aspect of the object of the present application, a ceramic body reinforcing agent is provided, which comprises the following raw materials in parts by weight: polydopamine modified bentonite-polyphosphate composite 10-22 parts, lignin modified inorganic particles 6-15 parts, sepiolite powder 5-12 parts, inorganic binder 3-10 parts, and sodium lithium magnesium silicate 0.1-2 parts; the polydopamine modified bentonite-polyphosphate composite is generated by the reaction of bentonite, nano-silicon dioxide, hydroxyl sulfonate, dopamine hydrochloride, aluminum chloride and calcium polyphosphate; and the lignin modified inorganic particles are generated by the reaction of inorganic particles and alkali lignin.

[0006] The polydopamine has excellent surface interface adhesion ability due to the catechol groups, and can adhere to different substrate surfaces by hydrogen bonds, chemical bonds and the like, so that the body powder can be well bonded together and the slurry flow rate is accelerated.

[0007] The calcium polyphosphate has a long chain structure, and the main chain is connected by a large number of phosphorus-oxygen (P-O) bonds similar to the high-energy phosphate bonds in ATP, and the bond energy can reach 11 KJ / mol, so it has high mechanical strength, and after being modified by polydopamine, it can be well bonded with the body powder to improve the strength of the body.

[0008] The bentonite is a non-metallic mineral product with montmorillonite as the main mineral component, and has strong hygroscopicity and swelling property, can absorb 8-15 times the volume of water, and the volume expansion can reach several times to 30 times; in an aqueous medium, the bentonite can be dispersed into a gelatinous and suspended state, and the medium solution has certain viscosity, thixotropy and lubricity, and has strong cation exchange capacity, and has certain adsorption capacity for various gases, liquids and organic substances. The hydroxyl sulfonate has good water solubility, low temperature resistance, emulsification, hard water resistance and dispersion performance; the nano-silicon dioxide has a size range of 1-100 nm, has optical properties against ultraviolet rays, and can improve the anti-aging, strength and chemical resistance of other materials. After being treated by nano-silicon dioxide and hydroxyl sulfonate, the coupling effect of the particles of the bentonite itself can be reduced, the strength of the bentonite can be improved, and the dispersion performance of the bentonite can be further improved. The polydopamine can enhance the coupling strength of the bentonite and the body material; the introduction of aluminum can provide a skeleton component for the ceramic product, and the bonding strength of the ceramic body is further improved.

[0009] The lignin is an aromatic polymer widely existing in plant bodies, and contains a large amount of benzene ring, carbonyl and other conjugated structures and phenolic hydroxyl groups, has a large relative molecular mass, greatly increases the steric hindrance effect of the polymer, and can improve the dispersibility and stability of the ceramic slurry. The inorganic particles can provide a skeleton component for the ceramic, and the coating of alkali lignin can enable the inorganic particles to self-disperse in the body, thereby improving the strength of the body.

[0010] Sepiolite is a kind of hydrated magnesium silicate clay mineral with layer chain structure, which can be used as catalyst, suspending agent, thickening agent and thixotropic agent in light textile and chemical industry. Inorganic binder can improve the viscosity of the system. Sodium lithium magnesium silicate has nano microcrystalline structure and can form nano colorless transparent thixotropic gel in water; the crystal structure unit of lithium magnesium silicate gel is a small flake with nanometer thickness. The surface of the small flake is covered with exchangeable cations, mainly Na + ; when the gel particles are mixed with water, water contacts Na + and is adsorbed to the surface of the flake, which expands the gel along the flake, and at this time the particles expand rapidly until the flake separates; due to the negative charge on the layer surface and the positive charge on the end surface of the flake, the end surface of the separated flake is attracted to the layer surface of another flake, thereby rapidly forming a three-dimensional spatial colloidal structure, i.e. card house structure, so as to increase the viscosity of the system.

[0011] In summary, the present application uses two or more functional raw materials for modification and compounding, which has the advantages of small amount of use and can greatly enhance the strength of the green body structure.

[0012] Preferably, the inorganic particles include one or two or more combinations of SiO2, TiO2, Al2O3, ZnO, BaSO4.

[0013] Preferably, the inorganic binder includes one or two or more combinations of aluminum sulfate, potassium aluminum sulfate, aluminum chloride, sodium silicate.

[0014] Preferably, the hydroxyl sulfonate has a general structure of RSO3Y, wherein R is C8-C 18 substituted straight chain or branched alkyl, aromatic group, substituted aromatic group or C8-C 18 substituted cycloalkyl, and Y is sodium or potassium; the substituent is one or two or more combinations of amido, succinate, aldehyde group, ketone group, ether group, ester group, amino group.

[0015] In another aspect of the present application, a preparation method of a ceramic green body reinforcing agent is provided, which comprises the following steps:

[0016] 1) Preparation of polydopamine / bentonite-polyphosphate composite material: prepare a nano silicon dioxide solution, add bentonite and hydroxyl sulfonate to the nano silicon dioxide solution, uniformly disperse, then separate the solid, dry to obtain modified bentonite;

[0017] Disperse the modified bentonite, calcium polyphosphate and dopamine hydrochloride in a Tris buffer solution, stir and react at 40-90℃ for 6-24h, then add aluminum chloride and continue to stir for a period of time, finally add ammonia water and continue to stir for a period of time, after the reaction is completed, separate the solid and dry, to obtain the polydopamine modified bentonite-polyphosphate composite material.

[0018] 2) Preparation of lignin-modified inorganic particles: Add alkali lignin to water, adjust the pH value to 3-6.5, mix evenly to obtain alkali lignin solution; then slowly add and disperse inorganic particles in alkali lignin solution, stir to react; after the reaction is completed, separate the solid, dry it, and obtain lignin-modified inorganic particles.

[0019] 3) The polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and magnesium lithium sodium silicate are mixed evenly by dry method to obtain the ceramic body reinforcing agent.

[0020] This invention first treats bentonite with nano-silica and hydrocarbon sulfonates, which reduces the bonding effect of bentonite particles, improves its strength, and further enhances its dispersion performance. Polydopamine strengthens the bond between bentonite and the green body material. The introduction of aluminum provides a skeletal component for the ceramic product, further improving the bonding strength of the ceramic green body. Calcium polyphosphate, with its high mechanical strength, improves the strength of the ceramic skeleton. After polydopamine modification, calcium polyphosphate and bentonite can bond well with the green body powder, increasing the green body strength. Inorganic particles provide skeletal components for the ceramic, and the coating of alkali lignin allows the inorganic particles to self-disperse within the green body, improving its strength. Finally, the prepared polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and sodium magnesium lithium silicate are compounded to obtain a high-performance ceramic green body reinforcing agent.

[0021] Preferably, in step 1):

[0022] The concentration of the fumed silica solution is 0.5-2 wt%.

[0023] The amount of nano-silica used is 1-5 wt% of bentonite;

[0024] The amount of the hydrocarbon sulfonate used is 0.5-2 wt% of the bentonite;

[0025] The mass ratio of the modified bentonite, calcium polyphosphate, dopamine hydrochloride, and aluminum chloride is 3-20:1-5:1:1-10.

[0026] Preferably, in step 1):

[0027] The time required for uniform dispersion is 0.5-2 hours;

[0028] The time for adding aluminum chloride and continuing to stir is 10-60 min, and the stirring speed is 200-500 r / min;

[0029] The reaction time after adding ammonia is 10-60 minutes, and the stirring speed is 200-500 r / min.

[0030] Preferably, in step 2):

[0031] The mass ratio of the alkali lignin to the inorganic particles is 1:0.5-5;

[0032] The concentration of the alkali lignin solution is 0.01-0.2 g / mL.

[0033] Preferably, in step 2), the stirring speed is 200-500 r / min and the time is 10-60 min; the drying is freeze drying.

[0034] Preferably, in step 3), the dry mixing process is used to grind the ceramic body reinforcing agent to a particle size of 50 mesh or less.

[0035] The present invention can achieve the following beneficial effects:

[0036] This invention first treats bentonite with nano-silica and hydrocarbon sulfonates, which reduces the bonding effect of bentonite particles, improves its strength, and further enhances its dispersion performance. Polydopamine strengthens the bond between bentonite and the green body material. The introduction of aluminum provides a skeletal component for the ceramic product, further improving the bonding strength of the ceramic green body. Calcium polyphosphate, with its high mechanical strength, improves the strength of the ceramic skeleton. After polydopamine modification, calcium polyphosphate and bentonite can bond well with the green body powder, increasing the green body strength. Inorganic particles provide skeletal components for the ceramic, and the coating of alkali lignin allows the inorganic particles to self-disperse within the green body, improving its strength. Finally, the prepared polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and sodium magnesium lithium silicate are compounded to obtain a high-performance ceramic green body reinforcing agent.

[0037] The ceramic green body reinforcing agent of the present invention has the advantages of small dosage and greatly enhanced structural strength of the green body, and can significantly improve the strength of the ceramic green body without affecting the fluidity of the slurry. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] A ceramic body reinforcing agent comprises the following raw materials in parts by weight: 10 parts of polydopamine-modified bentonite-calcium polyphosphate composite material, 6 parts of lignin-modified inorganic particles, 12 parts of sepiolite powder, 3 parts of aluminum sulfate, 3 parts of potassium aluminum sulfate, 4 parts of sodium silicate, and 2 parts of sodium magnesium lithium silicate; wherein the inorganic particles are SiO2 and TiO2 (mass ratio 1:1).

[0041] The preparation method of this ceramic green body reinforcing agent includes the following steps:

[0042] 1) Preparation of polydopamine / bentonite-polyphosphate composite material: Prepare a 0.5wt% nano silica solution, add bentonite and sodium dodecyl sulfonate to the nano silica solution, stir for 1 hour to disperse evenly, then separate the solid, dry it to obtain modified bentonite; wherein, the amount of nano silica is 1.5wt% of bentonite, and the amount of sodium dodecyl sulfonate is 0.5wt% of bentonite;

[0043] Modified bentonite, calcium polyphosphate, and dopamine hydrochloride were dispersed in a Tris buffer solution with pH = 8.5 and stirred at 45°C for 24 h. Then, aluminum chloride was added and stirred at 200 r / min for 45 min. Finally, ammonia water was added and stirred at 200 r / min for 45 min. After the reaction was completed, the solid was separated and dried to obtain the polydopamine-modified bentonite-polyphosphate composite material. The mass ratio of modified bentonite, calcium polyphosphate, dopamine hydrochloride, and aluminum chloride was 3:1:1:1.

[0044] 2) Preparation of lignin-modified inorganic particles: Alkali lignin was added to water, the pH was adjusted to 3.5, and the mixture was stirred evenly to obtain an alkali lignin solution of 0.02 g / mL; then inorganic particles were slowly added and dispersed in the alkali lignin solution, with a mass ratio of alkali lignin to inorganic particles of 1:5, and the mixture was stirred at 200 r / min for 45 min; after the reaction was completed, the solid was separated and freeze-dried to obtain lignin-modified inorganic particles;

[0045] 3) The polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and magnesium lithium sodium silicate are mixed evenly by dry method and ground to a particle size of 50 mesh or less to obtain the ceramic body reinforcing agent.

[0046] Example 2

[0047] A ceramic body reinforcing agent comprises the following raw materials in parts by weight: 22 parts of polydopamine-modified bentonite-calcium polyphosphate composite material, 15 parts of lignin-modified inorganic particles, 5 parts of sepiolite powder, 3 parts of sodium silicate, and 0.2 parts of sodium magnesium silicate lithium salt; wherein the inorganic particles are Al2O3, ZnO and BaSO4 (mass ratio 1:1:1).

[0048] A method for preparing a ceramic green body reinforcing agent includes the following steps:

[0049] 1) Preparation of polydopamine / bentonite-polyphosphate composite material: Prepare a 2wt% nano silica solution, add bentonite, disodium octadecyl sulfosuccinate, and sodium dodecylbenzene sulfonate to the nano silica solution, stir for 2 hours to disperse evenly, then separate the solid, dry it to obtain modified bentonite; wherein, the amount of nano silica is 5wt% of bentonite, and the amount of disodium octadecyl sulfosuccinate and sodium dodecylbenzene sulfonate is 1wt% of bentonite;

[0050] Modified bentonite, calcium polyphosphate, and dopamine hydrochloride were dispersed in a Tris buffer solution with pH = 8.5 and stirred at 85℃ for 6 h. Then, aluminum chloride was added and stirred at 500 r / min for 10 min. Finally, ammonia water was added and stirred at 500 r / min for 10 min. After the reaction was completed, the solid was separated and dried to obtain the polydopamine-modified bentonite-polyphosphate composite material. The mass ratio of modified bentonite, calcium polyphosphate, dopamine hydrochloride, and aluminum chloride was 20:5:1:10.

[0051] 2) Preparation of lignin-modified inorganic particles: Alkali lignin was added to water, the pH was adjusted to 6.5, and the mixture was stirred evenly to obtain an alkali lignin solution of 0.2 g / mL; then inorganic particles were slowly added and dispersed in the alkali lignin solution, with a mass ratio of alkali lignin to inorganic particles of 1:0.5, and the mixture was stirred at 500 r / min for 10 min; after the reaction was completed, the solid was separated and freeze-dried to obtain lignin-modified inorganic particles.

[0052] 3) The polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and magnesium lithium sodium silicate are mixed evenly by dry method and ground to a particle size of 50 mesh or less to obtain the ceramic body reinforcing agent.

[0053] Example 3

[0054] A ceramic body reinforcing agent comprises the following raw materials in parts by weight: 16 parts of polydopamine-modified bentonite-calcium polyphosphate composite material, 10 parts of lignin-modified inorganic particles, 9 parts of sepiolite powder, 3 parts of aluminum sulfate, 3 parts of sodium silicate, and 1 part of sodium magnesium lithium silicate; wherein the inorganic particles are TiO2 and BaSO4 (mass ratio 1:1).

[0055] A method for preparing a ceramic green body reinforcing agent includes the following steps:

[0056] 1) Preparation of polydopamine / bentonite-polyphosphate composite material: Prepare a 1.2 wt% nano silica solution, add bentonite and disodium octadecyl sulfosuccinate to the nano silica solution, stir for 1 h to disperse evenly, then separate the solid, dry it to obtain modified bentonite; wherein, the amount of nano silica is 3 wt% of bentonite, and the amount of disodium octadecyl sulfosuccinate is 1.15 wt% of bentonite;

[0057] Modified bentonite, calcium polyphosphate, and dopamine hydrochloride were dispersed in a Tris buffer solution with pH = 8.5 and stirred at 60℃ for 10 h. Then, aluminum chloride was added and stirred at 350 r / min for 30 min. Finally, ammonia water was added and stirred at 350 r / min for 30 min. After the reaction was completed, the solid was separated and dried to obtain the polydopamine-modified bentonite-polyphosphate composite material. The mass ratio of modified bentonite, calcium polyphosphate, dopamine hydrochloride, and aluminum chloride was 10:3:1:5.

[0058] 2) Preparation of lignin-modified inorganic particles: Alkali lignin was added to water, the pH was adjusted to 5, and the mixture was stirred evenly to obtain an alkali lignin solution of 0.1 g / mL; then inorganic particles were slowly added and dispersed in the alkali lignin solution, with a mass ratio of alkali lignin to inorganic particles of 1:3, and the mixture was stirred at 350 r / min for 30 min; after the reaction was completed, the solid was separated and freeze-dried to obtain lignin-modified inorganic particles.

[0059] 3) The polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and magnesium lithium sodium silicate are mixed evenly by dry method and ground to a particle size of 50 mesh or less to obtain the ceramic body reinforcing agent.

[0060] Example 4

[0061] A ceramic body reinforcing agent comprises the following raw materials in parts by weight: 18 parts of polydopamine-modified bentonite-calcium polyphosphate composite material, 8 parts of lignin-modified inorganic particles, 7 parts of sepiolite powder, 4.5 parts of potassium aluminum sulfate, and 0.6 parts of sodium magnesium silicate; wherein the inorganic particles are SiO2 and ZnO (mass ratio 1:1).

[0062] A method for preparing a ceramic green body reinforcing agent includes the following steps:

[0063] 1) Preparation of polydopamine / bentonite-polyphosphate composite material: Prepare a 1.5wt% nano silica solution, add bentonite and sodium dodecylbenzenesulfonate to the nano silica solution, stir for 1.5h to disperse evenly, then separate the solid, dry it to obtain modified bentonite; wherein, the amount of nano silica is 2wt% of bentonite, and the amount of sodium dodecylbenzenesulfonate is 1.5wt% of bentonite;

[0064] Modified bentonite, calcium polyphosphate, and dopamine hydrochloride were dispersed in a Tris buffer solution with pH = 8.5 and stirred at 50°C for 12 h. Then, aluminum chloride was added and stirred at 300 r / min for 30 min. Finally, ammonia water was added and stirred at 300 r / min for 30 min. After the reaction was completed, the solid was separated and dried to obtain the polydopamine-modified bentonite-polyphosphate composite material. The mass ratio of modified bentonite, calcium polyphosphate, dopamine hydrochloride, and aluminum chloride was 7:2:1:3.

[0065] 2) Preparation of lignin-modified inorganic particles: Alkali lignin was added to water, the pH was adjusted to 4.5, and the mixture was stirred evenly to obtain an alkali lignin solution of 0.05 g / mL; then inorganic particles were slowly added and dispersed in the alkali lignin solution, with a mass ratio of alkali lignin to inorganic particles of 1:1.5, and the mixture was stirred at 300 r / min for 30 min; after the reaction was completed, the solid was separated and freeze-dried to obtain lignin-modified inorganic particles.

[0066] 3) The polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and magnesium lithium sodium silicate are mixed evenly by dry method and ground to a particle size of 50 mesh or less to obtain the ceramic body reinforcing agent.

[0067] Example 5

[0068] A ceramic body reinforcing agent comprises the following raw materials in parts by weight: 13 parts of polydopamine-modified bentonite-calcium polyphosphate composite material, 12 parts of lignin-modified inorganic particles, 10 parts of sepiolite powder, 4 parts of aluminum sulfate, 4 parts of sodium silicate, and 1.5 parts of sodium magnesium silicate; wherein the inorganic particles are TiO2 and BaSO4 (mass ratio 1:1).

[0069] A method for preparing a ceramic green body reinforcing agent includes the following steps:

[0070] 1) Preparation of polydopamine / bentonite-polyphosphate composite material: Prepare a 1wt% nano silica solution, add bentonite and disodium octadecyl sulfosuccinate to the nano silica solution, stir for 1 hour to disperse evenly, then separate the solid, dry it to obtain modified bentonite; wherein, the amount of nano silica is 4.1wt% of bentonite, and the amount of disodium octadecyl sulfosuccinate is 0.8wt% of bentonite;

[0071] Modified bentonite, calcium polyphosphate, and dopamine hydrochloride were dispersed in a Tris buffer solution with pH = 8.5 and stirred at 40-90℃ for 6-24 h. Then, aluminum chloride was added and stirred at 400 r / min for 30 min. Finally, ammonia water was added and stirred at 400 r / min for 30 min. After the reaction was completed, the solid was separated and dried to obtain the polydopamine-modified bentonite-polyphosphate composite material. The mass ratio of modified bentonite, calcium polyphosphate, dopamine hydrochloride, and aluminum chloride was 15:4:1:7.

[0072] 2) Preparation of lignin-modified inorganic particles: Alkali lignin was added to water, the pH was adjusted to 5.5, and the mixture was stirred evenly to obtain an alkali lignin solution of 0.15 g / mL; then inorganic particles were slowly added and dispersed in the alkali lignin solution, with a mass ratio of alkali lignin to inorganic particles of 1:3.8, and the mixture was stirred at 400 r / min for 30 min; after the reaction was completed, the solid was separated and freeze-dried to obtain lignin-modified inorganic particles.

[0073] 3) The polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and magnesium lithium sodium silicate are mixed evenly by dry method and ground to a particle size of 50 mesh or less to obtain the ceramic body reinforcing agent.

[0074] Comparative Example 1

[0075] Without polydopamine modification, the prepared modified bentonite and calcium polyphosphate were dispersed in water, and the remaining experimental steps were the same as in Example 3.

[0076] Comparative Example 2

[0077] The bentonite was not modified with nano-silica and hydrocarbon sulfonate, and the remaining experimental steps were the same as in Example 3.

[0078] Comparative Example 3

[0079] Remove the calcium polyphosphate, and follow the same experimental steps as in Example 3.

[0080] Comparative Example 4

[0081] The inorganic particles were not modified with alkali lignin, and the remaining experimental steps were the same as in Example 3.

[0082] The ceramic body reinforcing agents obtained in Examples 1-5 and Comparative Examples 1-4 were used to prepare ceramic green bodies: 0.075 wt% of the dry weight of the ceramic green body was ball-milled together with the raw materials to prepare a slurry with a water content of 35 wt%. The fluidity and green body strength of the obtained ceramic green bodies were tested, and the test results are listed in Table 1.

[0083] Slurry flowability test: Pour the prepared slurry into a 100ml Fork-4 cup, let it stand for 3 seconds, and then use a stopwatch to record the time it takes for the slurry to flow out completely. Control the slurry temperature at 25℃, and take the average of three measurements as the slurry flow rate.

[0084] Green strength test: The prepared slurry was molded on a test press at a pressure of 10MPa to obtain a 10mm×10mm×50mm test strip. After drying, the strength of the test strip was tested using a three-point flexural strength tester.

[0085] Table 1

[0086]

[0087]

[0088] As shown in Table 1, compared with Comparative Examples 1-4, the ceramic body reinforcing agent provided by the present invention can significantly improve the strength of the ceramic body without affecting the fluidity of the slurry. Each component plays a complementary role. A small amount of reinforcing agent can significantly improve the dispersibility and plasticity of the slurry. The bonding degree between ceramic raw materials is higher, thereby greatly improving the strength of the ceramic body.

[0089] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 ceramic body reinforcing agent, characterized in that, The raw materials include the following parts by weight: 10-22 parts of polydopamine-modified bentonite-calcium polyphosphate composite material, 6-15 parts of lignin-modified inorganic particles, 5-12 parts of sepiolite powder, 3-10 parts of inorganic binder, and 0.1-2 parts of sodium magnesium lithium silicate; the polydopamine-modified bentonite-calcium polyphosphate composite material is generated by reacting bentonite, nano-silica, hydrocarbon sulfonate, dopamine hydrochloride, aluminum chloride, and calcium polyphosphate; the lignin-modified inorganic particles are generated by reacting inorganic particles with alkali lignin. Preparation of polydopamine / bentonite-polyphosphate composite material: Prepare nano-silica solution, add bentonite and hydrocarbon sulfonate into nano-silica solution, disperse evenly, then separate the solid, dry, and obtain modified bentonite; Modified bentonite, calcium polyphosphate, and dopamine hydrochloride were dispersed in Tris buffer solution and stirred at 40-90℃ for 6-24 hours. Then aluminum chloride was added and stirring was continued for a period of time. Finally, ammonia water was added and stirring was continued for a period of time. After the reaction was completed, the solid was separated and dried to obtain polydopamine modified bentonite-polyphosphate composite material. Preparation of lignin-modified inorganic particles: Alkali lignin is added to water, the pH is adjusted to 3-6.5, and the mixture is homogeneous to obtain an alkali lignin solution; then inorganic particles are slowly added and dispersed in the alkali lignin solution, and the reaction is stirred; after the reaction is completed, the solid is separated and dried to obtain lignin-modified inorganic particles. The mass ratio of the modified bentonite, calcium polyphosphate, dopamine hydrochloride, and aluminum chloride is 3-20:1-5:1:1-10.

2. The ceramic body reinforcing agent according to claim 1, characterized in that, The inorganic particles include one or more of SiO2, TiO2, Al2O3, ZnO, and BaSO4.

3. The ceramic body reinforcing agent according to claim 1, characterized in that, The inorganic binder includes one or more of aluminum sulfate, potassium aluminum sulfate, and sodium silicate.

4. The ceramic body reinforcing agent according to claim 1, characterized in that, The general structural formula of the hydrocarbon sulfonate is RSO3Y, where R is C8-C. 18 Substituted linear or branched alkyl groups, aromatic groups, substituted aromatic groups, or C8-C groups 18 The substituted cycloalkyl group, where Y is sodium or potassium, is selected from one or more of the following groups: amide, succinate, aldehyde, ketone, ether, ester, and amino.

5. A method for preparing a ceramic body reinforcing agent as described in any one of claims 1-4, characterized in that, Includes the following steps: 1) Preparation of polydopamine / bentonite-polyphosphate composite material: Prepare nano silica solution, add bentonite and hydrocarbon sulfonate into nano silica solution, disperse evenly, then separate the solid, dry, and obtain modified bentonite; Modified bentonite, calcium polyphosphate, and dopamine hydrochloride were dispersed in Tris buffer solution and stirred at 40-90℃ for 6-24 hours. Then aluminum chloride was added and stirring was continued for a period of time. Finally, ammonia water was added and stirring was continued for a period of time. After the reaction was completed, the solid was separated and dried to obtain polydopamine modified bentonite-polyphosphate composite material. 2) Preparation of lignin-modified inorganic particles: Add alkali lignin to water, adjust the pH value to 3-6.5, mix evenly to obtain alkali lignin solution; then slowly add and disperse inorganic particles in alkali lignin solution, stir to react; after the reaction is completed, separate the solid, dry it, and obtain lignin-modified inorganic particles. 3) The polydopamine / bentonite-polyphosphate composite material, lignin-modified inorganic particles, sepiolite powder, inorganic binder, and magnesium lithium sodium silicate are mixed evenly by dry method to obtain the ceramic body reinforcing agent.

6. The method for preparing a ceramic body reinforcing agent according to claim 5, characterized in that, In step 1): The concentration of the nano-silica solution is 0.5-2 wt%. The amount of nano-silica used is 1-5 wt% of bentonite; The amount of the hydrocarbon sulfonate used is 0.5-2 wt% of bentonite.

7. The method for preparing a ceramic body reinforcing agent according to claim 5, characterized in that, In step 1): The time required for uniform dispersion is 0.5-2 hours; The time for adding aluminum chloride and continuing to stir is 10-60 min, and the stirring speed is 200-500 r / min; The reaction time after adding ammonia is 10-60 minutes, and the stirring speed is 200-500 r / min.

8. The method for preparing a ceramic body reinforcing agent according to claim 5, characterized in that, In step 2): The mass ratio of the alkali lignin to the inorganic particles is 1:0.5-5; The concentration of the alkali lignin solution is 0.01-0.2 g / mL.

9. The method for preparing a ceramic body reinforcing agent according to claim 5, characterized in that, In step 2): the stirring speed is 200-500 r / min and the time is 10-60 min; the drying is freeze drying.

10. The method for preparing a ceramic body reinforcing agent according to claim 5, characterized in that, In step 3): the dry mixing process is used to grind the ceramic body reinforcing agent to a particle size of 50 mesh or less.

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