A deagglomerant for improving the thixotropy of a mud and a method of making the same

Abstract

The application relates to the technical field of ceramic industry, and provides a debonding agent capable of improving the thixotropy of mud and a preparation method thereof. The debonding agent comprises the following raw materials in parts by weight: 5-12 parts of enzymatic hydrolysis lignin, 3-10 parts of amino acid, 3-10 parts of glyoxal, 6-15 parts of methylene phosphonate, 6-15 parts of polyoxyethylene ether, 5-10 parts of polyethylene glycol diacrylate, 5-10 parts of acrylic monomer, 1.5-5 parts of cyclotriphosphazene crosslinking agent, 1-5 parts of silicate and 0.5-3 parts of tannic acid; the amino acid modified lignin is obtained through crosslinking reaction of enzymatic hydrolysis lignin, amino acid and glyoxal; the enzymatic hydrolysis lignin, amino acid, glyoxal, polyethylene glycol diacrylate, acrylic monomer and cyclotriphosphazene crosslinking agent are polymerized to form a crosslinking network, and the tannic acid is doped in the crosslinking network structure. The debonding agent provided by the application is compounded by using a polymer crosslinking structure and various functional raw materials, has good fluidity and thixotropy, and has very excellent debonding effect.

Description

Technical Field

[0001] This invention relates to the field of ceramic industry technology, and in particular to a degumming agent that can improve the thixotropic properties of slurry and its preparation method. Background Technology

[0002] The fluidity of clay slurry is inversely proportional to its relative viscosity. Good fluidity is essential for ensuring the quality of the green body and preventing deformation. In ceramic production, the water content of clay slurry is generally between 33% and 36%. However, even at this high water content, clay slurry containing clay minerals still exhibits poor fluidity. When the slurry viscosity is too high, its poor fluidity and rapid absorption into the mold cause uneven thickness and a rough surface in the green body. Furthermore, incomplete drainage during slurry removal can lead to defects such as cracks during drying, posing significant challenges to production, especially in molding.

[0003] Ceramic desiccant is a widely used ceramic additive used in processes such as clay selection, slurry grinding, and glaze preparation in the ceramic industry. Its function is to improve the fluidity of the slurry, allowing it to maintain good flowability, suspension, and low thixotropy even with reduced moisture content. Common desiccant includes inorganic desiccant, low-molecular-weight organic desiccant, and high-molecular-weight desiccant. Inorganic desiccant, such as sodium chloride, sodium silicate, sodium carbonate, and sodium tripolyphosphate, has limited application due to its molecular weight and structure, and its high dosage increases production costs. Low-molecular-weight organic desiccant, such as sodium citrate, sodium ethylenediaminetetraacetate, and sodium hydroxyethylethylenediaminetriacetate, has poor desiccant effect. High-molecular-weight desiccant, such as sodium polyacrylate, polyvinyl alcohol, and polycarboxylic acid-based desiccant, has better desiccant effect, but its usage is still relatively large, and it cannot effectively improve the thixotropy of the slurry. Summary of the Invention

[0004] This invention aims to solve at least one of the above-mentioned technical problems by providing a degumming agent that improves the thixotropic properties of mud, exhibits excellent degumming effect, significantly reduces dosage, and has a simple preparation method without increasing costs. This invention achieves its objective through the following technical solution:

[0005] One objective of this invention is to provide a degumming agent that can improve the thixotropic properties of mud, comprising the following raw materials in parts by weight: 5-12 parts of enzymatically hydrolyzed lignin, 3-10 parts of amino acids, 3-10 parts of glyoxal, 6-15 parts of methylene phosphate, 6-15 parts of polyoxyethylene ether, 5-10 parts of polyethylene glycol diacrylate, 5-10 parts of acrylic acid monomer, 1.5-5 parts of cyclotriphosphazene crosslinking agent, 1-5 parts of silicate, and 0.5-3 parts of tannic acid; wherein the amino acid-modified lignin is obtained by enzymatically hydrolyzing lignin, and the amino acids and glyoxal are obtained through a crosslinking reaction; the enzymatically hydrolyzed lignin, amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomer, and cyclotriphosphazene crosslinking agent are polymerized to form a crosslinked network, and tannic acid is incorporated into the crosslinked network structure.

[0006] Preferably, the amino acid comprises one or more of lysine, threonine, leucine, methionine, tryptophan, phenylalanine, arginine, and histidine.

[0007] Preferably, the methylene phosphate comprises one or more of the following: hydroxyethylidene diphosphonate, aminotrimethylidene phosphate, diethylenetriaminepentamethylidene phosphonate, dihexenetriaminepentamethylidene phosphonic acid, hexamethylenediaminetetramethylidene phosphonate potassium salt, and ethylenediaminetetramethylidene phosphate.

[0008] Preferably, the polyoxyethylene ether comprises one or more of alkylphenol polyoxyethylene ether, polyethylene glycol alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene octylphenol ether, and carbon fatty alcohol polyoxyethylene ether.

[0009] Preferably, the acrylic monomer comprises one or more of butenedioic acid, acrylic acid, and methacrylic acid.

[0010] Another objective of this invention is to provide a method for preparing a degumming agent that can improve the thixotropic properties of mud, comprising the following steps:

[0011] 1) Dissolve the enzymatically hydrolyzed lignin in sodium hydroxide solution, and then dissolve the enzymatically hydrolyzed lignin solution together with amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomer, crosslinking agent, initiator, and tannic acid in a solvent and mix thoroughly.

[0012] 2) Under ultraviolet light irradiation, the temperature is raised to 40-70℃, and the enzymatic hydrolysis of lignin solution, amino acids, glyoxal, polyethylene glycol diacrylate, acrylic monomer and crosslinking agent are initiated to form a crosslinked network, with tannic acid doped in the crosslinked network structure;

[0013] 3) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 2), stir evenly, and spray dry to obtain the degumming agent.

[0014] Preferably, the solvent in step 1) includes one or more of water, tetrahydrofuran, acetonitrile, N,N-dimethylformamide, and dimethyl sulfoxide.

[0015] Preferably, the mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic monomer in step 1) is 1:2-20.

[0016] Preferably, the initiator in step 1) includes one or more of 2-hydroxy-methylphenylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, and 2-hydroxy-2-methylpropanone.

[0017] Preferably, the polymerization reaction time in step 2) is 1-4 hours.

[0018] Preferably, the particle size of the degumming agent obtained in step 3) is less than 30 mesh.

[0019] The present invention can achieve the following beneficial effects:

[0020] Enzymatic hydrolysis of lignin, amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomers, and cyclotriphosphazene crosslinking agents are polymerized under the action of an initiator to form a polymer with a complex crosslinked network structure. Amino acids can be grafted onto enzymatically hydrolyzed lignin via glyoxal, increasing the amino content and steric hindrance in the polymer. Introducing amino groups into the lignin polyphenol polymer not only increases electrostatic interactions but also allows it to act as a surfactant, exhibiting excellent emulsifying and dispersing properties. The polymer system contains multiple sulfonic acid, amino, ester, and carboxyl functional groups. On the one hand, the increased functional group density of the polymer system increases the polymer's charge density. The polymer with anionic carboxyl, ester, and sulfonic acid groups adsorbs onto the surface of ceramic particles, resulting in strong electrostatic repulsion between particles, thus effectively preventing the agglomeration of ceramic particles. Furthermore, amino, sulfonic acid, ester, and carboxyl groups can chelate with cations, releasing water adsorbed by hydrated cations, thus significantly improving the fluidity and thixotropy of ceramic slurries. They are also stable in coordination with high-valence metal ions, adapting to water conditions containing these ions. The cyclotriphosphazene crosslinking agent contains a benzene ring structure, which enhances the steric hindrance effect of the polymer. Tannic acid is a green, water-soluble substance containing a large number of benzene rings. It has a high relative molecular mass, high degree of branching and tortuosity, and the numerous benzene rings in its molecule, along with its doping in the crosslinking network structure, significantly increase the steric hindrance effect of the polymer, improving the stability of the ceramic slurry. Methylene phosphate contains N atoms that are stable in coordination with high-valence metal ions, and methylene phosphonate groups -P(O)(OM)2 and hydroxyl groups -OH. Polyoxyethylene ether, readily soluble in water, possesses excellent emulsifying, dispersing, and solubilizing properties. It does not ionize in water; when dispersed on the surface of the dispersed phase, it forms a thin film or electric double layer, which charges the dispersed phase and prevents the small droplets from agglomerating, thus maintaining the fluidity and thixotropic properties of the slurry. Silicates and phosphates have different debinding mechanisms, and their combination further enhances the performance of the debinding agent. The debinding agent prepared in this invention contains nitrogen and multiple carboxyl side chains. On one hand, the carboxyl anions form charge adsorption with metal ions; on the other hand, the lone pair electrons on the N atom form coordinate bonds with the empty d orbitals of high-valence metal ions, forming a stable 5- and 6-membered ring polycyclic complex. Combined with the strong hydrophilicity of the N atom, the resulting complex can be dissolved and dispersed in the water medium, greatly eliminating the interference of high-valence metal ions on the slurry and maintaining the dispersibility and fluidity of the slurry particles in the aqueous medium. The degumming agent provided by this invention adopts a polymer cross-linking structure and is compounded with a variety of functional raw materials, which greatly reduces the amount of degumming agent used. It has the advantages of small usage, good mud fluidity and thixotropy, and has a very good degumming effect.

[0021] The degumming agent provided by this invention uses enzymatically hydrolyzed lignin as one of the raw materials, making full use of biomass resources and having better biodegradability. Amino acids are also common biological raw materials. This invention reduces dependence on non-renewable resources and is more green and environmentally friendly.

[0022] The preparation process of this invention is simple, easy to operate, and easy to industrialize. Detailed Implementation

[0023] 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.

[0024] A preferred embodiment of the present invention provides a degumming agent that can improve the thixotropic properties of mud, comprising the following raw materials in parts by weight: 10-25 parts amino acid-modified lignin, 8-20 parts methylene phosphate, 6-15 parts polyoxyethylene ether, 5-10 parts polyethylene glycol diacrylate, 5-10 parts acrylic acid monomer, 1.5-5 parts cyclotriphosphazene crosslinking agent, 1-5 parts silicate, and 0.5-3 parts tannic acid. Wherein:

[0025] Amino acid-modified lignin is obtained by enzymatic hydrolysis of lignin, followed by a cross-linking reaction between amino acids and glyoxal. The amino acids include one or more of lysine, threonine, leucine, methionine, tryptophan, phenylalanine, arginine, and histidine. Methylene phosphates include one or more of hydroxyethylidene diphosphonate, aminotrimethylidene phosphate, diethylenetriaminepentamethylidene phosphonate, dihexenetriaminepentamethylidene phosphonic acid, hexamethylenediaminetetramethylidene phosphonate potassium salt, and ethylenediaminetetramethylidene phosphate. Polyoxyethylene ethers include one or more of alkylphenol polyoxyethylene ethers, polyethylene glycol alkylphenol polyoxyethylene ethers, alkylphenol polyoxyethylene octylphenol ethers, and fatty alcohol polyoxyethylene ethers. A cross-linked network is formed by polymerizing polyethylene glycol diacrylate, acrylic acid monomers, and cyclotriphosphazene cross-linking agents, with tannic acid doped into the cross-linked network structure. Acrylic acid monomers include one or more of butenedioic acid, acrylic acid, and methacrylic acid.

[0026] A preferred embodiment of the present invention also provides a method for preparing a degumming agent that can improve the thixotropic properties of mud, comprising the following steps:

[0027] 1) Polyethylene glycol diacrylate, acrylic monomer, crosslinking agent, initiator, and tannic acid are dissolved in a solvent and mixed evenly. Under anaerobic conditions, the initiator initiates the polymerization of polyethylene glycol diacrylate, acrylic monomer, and crosslinking agent to form a crosslinked network, with tannic acid incorporated into the crosslinked network structure. The mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic monomer is 1:2-20. The anaerobic conditions are a nitrogen atmosphere or an argon atmosphere. The solvent includes one or more of the following: water, tetrahydrofuran, acetonitrile, N,N-dimethylformamide, and dimethyl sulfoxide. The initiator includes one or more of the following: 2-hydroxy-methylphenylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, and 2-hydroxy-2-methylpropanone.

[0028] 2) After the reaction is complete, remove the solvent, dry at 50-110℃ for 8-24 hours, and grind to obtain the polymer;

[0029] 3) Dissolve the enzymatically hydrolyzed lignin in an alkaline solution to obtain an enzymatically hydrolyzed lignin solution, add lysine and glyoxal, and stir and heat at 30-60℃ for a certain period of time. After the reaction is completed, add an acid solution to adjust the pH of the reaction solution to neutral, dialyze it with a dialysis bag for 2-6 days, and dry the obtained dialysate to obtain amino acid modified lignin.

[0030] 4) Mix amino acid-modified lignin, methylene phosphate, polyoxyethylene ether and the obtained polymer using a dry method to obtain a degumming agent.

[0031] The following are specific embodiments. In a preferred embodiment of the present invention, the structure of the cyclotriphosphazene crosslinking agent is as follows:

[0032]

[0033] Example 1

[0034] A degumming agent for improving the thixotropic properties of mud comprises the following raw materials in parts by weight: 5 parts enzymatically hydrolyzed lignin, 3 parts amino acids, 3 parts glyoxal, 5 parts sodium hydroxyethylidene diphosphonate, 10 parts sodium aminotrimethylidene phosphate, 15 parts alkylphenol polyoxyethylene ether, 5 parts polyethylene glycol diacrylate, 5 parts butenedioic acid, 1.5 parts cyclotriphosphazene crosslinking agent, 1 part silicate, and 0.5 parts tannic acid. Specifically, the amino acid-modified lignin is obtained by enzymatically hydrolyzing lignin, and lysine and glyoxal are obtained through a crosslinking reaction; polyethylene glycol diacrylate, acrylic acid monomer, and cyclotriphosphazene crosslinking agent polymerize to form a crosslinked network, and tannic acid is incorporated into the crosslinked network structure.

[0035] The preparation method of the degumming agent in this embodiment includes the following steps:

[0036] 1) Dissolve enzymatically hydrolyzed lignin in sodium hydroxide solution. Then, mix the enzymatically hydrolyzed lignin solution with a mixed solvent consisting of amino acids, glyoxal, polyethylene glycol diacrylate, butenedioic acid, cyclotriphosphazene crosslinking agent, 2-hydroxy-methylphenylpropane-1-one initiator, tannic acid, water, and tetrahydrofuran (volume ratio 1:1). Mix thoroughly and heat to 40°C under ultraviolet light irradiation. The initiator initiates the polymerization of polyethylene glycol diacrylate, acrylic acid monomers, and crosslinking agent to form a crosslinked network. Tannic acid is incorporated into the crosslinked network structure. The reaction is carried out at a constant temperature for 1.5 hours. The mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic acid monomers is 1:3.

[0037] 2) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 1), stir evenly, and spray dry to obtain the descaling agent, with the particle size controlled to be less than 30 mesh.

[0038] Example 2

[0039] A degumming agent for improving the thixotropic properties of mud comprises the following raw materials in parts by weight: 12 parts enzymatically hydrolyzed lignin, 10 parts amino acids, 10 parts glyoxal, 8 parts sodium diethylenetriaminepentamethylphosphonate, 6 parts alkylphenol polyoxyethylene octylphenol ether, 10 parts polyethylene glycol diacrylate, 7 parts acrylic acid, 4 parts cyclotriphosphazene crosslinking agent, 5 parts silicate, and 3 parts tannic acid. Specifically, the amino acid-modified lignin is obtained by enzymatically hydrolyzing lignin, and threonine and glyoxal are obtained through a crosslinking reaction; polyethylene glycol diacrylate, acrylic acid monomer, and cyclotriphosphazene crosslinking agent are polymerized to form a crosslinked network, and tannic acid is incorporated into the crosslinked network structure.

[0040] The preparation method of the degumming agent in this embodiment includes the following steps:

[0041] 1) Dissolve enzymatically hydrolyzed lignin in sodium hydroxide solution. Then, mix the enzymatically hydrolyzed lignin solution with amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid, cyclotriphosphazene crosslinking agent, 1-hydroxycyclohexylphenyl ketone initiator, tannic acid, and water in a mixed solvent of dimethyl sulfoxide (volume ratio 1:1). Mix thoroughly and heat to 70°C under ultraviolet light irradiation. The initiator initiates the polymerization of polyethylene glycol diacrylate, acrylic acid monomer, and crosslinking agent to form a crosslinked network. Tannic acid is incorporated into the crosslinked network structure. The reaction is carried out at a constant temperature for 5 hours. The mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic acid monomer is 1:15.

[0042] 2) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 1), stir evenly, and spray dry to obtain the descaling agent, with the particle size controlled to be less than 40 mesh.

[0043] Example 3

[0044] A degumming agent for improving the thixotropic properties of mud comprises the following raw materials in parts by weight: 8 parts enzymatically hydrolyzed lignin, 7 parts amino acids, 7 parts glyoxal, 5 parts sodium dihexenetriaminepentamethylenephosphonate, 5 parts sodium ethylenediaminetetramethylenephosphonate, 5 parts alkylphenol polyoxyethylene ether, 5 parts polyethylene glycol alkylphenol polyoxyethylene ether, 7 parts polyethylene glycol diacrylate, 4 parts butadiene acid, 4 parts methacrylic acid, 3 parts cyclotriphosphazene crosslinking agent, 3 parts silicate, and 1.8 parts tannic acid. Specifically, the amino acid-modified lignin is obtained by enzymatically hydrolyzing lignin, and phenylalanine and glyoxal are obtained through a crosslinking reaction; polyethylene glycol diacrylate, acrylic acid monomers, and cyclotriphosphazene crosslinking agent are polymerized to form a crosslinked network, and tannic acid is incorporated into the crosslinked network structure. The acrylic acid monomers include one or more of butadiene acid, acrylic acid, and methacrylic acid.

[0045] The preparation method of the degumming agent in this embodiment includes the following steps:

[0046] 1) Dissolve enzymatically hydrolyzed lignin in sodium hydroxide solution. Then, mix the enzymatically hydrolyzed lignin solution with a mixed solvent consisting of amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomer, cyclotriphosphazene crosslinking agent, 2-hydroxy-2-methylpropanone initiator, tannic acid, water, and N,N-dimethylformamide (volume ratio 1:1). Mix thoroughly and heat to 50°C under ultraviolet light irradiation. The initiator initiates the polymerization of polyethylene glycol diacrylate, acrylic acid monomer, and crosslinking agent to form a crosslinked network. Tannic acid is incorporated into the crosslinked network structure. The reaction is carried out at a constant temperature for 3 hours. The mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic acid monomer is 1:10.

[0047] 2) After the reaction is complete, remove the solvent, dry at 80℃ for 12 hours, and grind to obtain the polymer;

[0048] 2) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 1), stir evenly, and spray dry to obtain the descaling agent, and control the particle size to be less than 50 mesh.

[0049] Example 4

[0050] A degumming agent for improving the thixotropic properties of mud comprises the following raw materials in parts by weight: 6 parts enzymatically hydrolyzed lignin, 4 parts amino acids, 4 parts glyoxal, 6 parts potassium sodium hexamethylenediaminetetramethylenephosphonate, 6 parts sodium ethylenediaminetetramethylenephosphate, 8 parts fatty alcohol polyoxyethylene ether, 7 parts polyethylene glycol diacrylate, 9 parts methacrylic acid, 2.5 parts cyclotriphosphazene crosslinking agent, 2 parts silicate, and 2 parts tannic acid. Specifically, the amino acid-modified lignin is obtained by enzymatically hydrolyzing lignin, and arginine and glyoxal are obtained through a crosslinking reaction; polyethylene glycol diacrylate, acrylic acid monomers, and cyclotriphosphazene crosslinking agent polymerize to form a crosslinked network, and tannic acid is incorporated into the crosslinked network structure.

[0051] The preparation method of the degumming agent in this embodiment includes the following steps:

[0052] 1) Dissolve enzymatically hydrolyzed lignin in sodium hydroxide solution. Then, mix the enzymatically hydrolyzed lignin solution with amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomer, cyclotriphosphazene crosslinking agent, 1-hydroxycyclohexylphenyl ketone initiator, and tannic acid in a mixed solvent of water and acetonitrile (volume ratio 1:1). Mix thoroughly and heat to 60°C under ultraviolet light irradiation. The initiator initiates the polymerization of polyethylene glycol diacrylate, acrylic acid monomer, and crosslinking agent to form a crosslinked network. Tannic acid is incorporated into the crosslinked network structure. The reaction is carried out at a constant temperature for 4 hours. The mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic acid monomer is 1:6.5.

[0053] 2) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 1), stir evenly, and spray dry to obtain the descaling agent, and control the particle size to be less than 50 mesh.

[0054] Example 5

[0055] A degumming agent for improving the thixotropic properties of mud comprises the following raw materials in parts by weight: 10 parts enzymatically hydrolyzed lignin, 6 parts amino acids, 6 parts glyoxal, 3 parts sodium dihexenetriaminepentamethylphosphonate, 3 parts potassium sodium hexanediaminetetramethylphosphonate, 13 parts polyethylene glycol alkylphenol polyoxyethylene ether, 9 parts polyethylene glycol diacrylate, 7 parts acrylic acid, 3.5 parts cyclotriphosphazene crosslinking agent, 4 parts silicate, and 1.2 parts tannic acid. Specifically, the amino acid-modified lignin is obtained by enzymatically hydrolyzing lignin, and methionine and glyoxal are obtained through a crosslinking reaction; polyethylene glycol diacrylate, acrylic acid monomer, and cyclotriphosphazene crosslinking agent polymerize to form a crosslinked network, and tannic acid is incorporated into the crosslinked network structure.

[0056] The preparation method of the degumming agent in this embodiment includes the following steps:

[0057] 1) Dissolve enzymatically hydrolyzed lignin in sodium hydroxide solution. Then, mix the enzymatically hydrolyzed lignin solution with a mixed solvent consisting of amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomer, cyclotriphosphazene crosslinking agent, 2-hydroxy-2-methylpropanone initiator, tannic acid, water, and N,N-dimethylformamide (volume ratio 1:1). Mix thoroughly and heat to 55°C under ultraviolet light irradiation. The initiator initiates the polymerization of polyethylene glycol diacrylate, acrylic acid monomer, and crosslinking agent to form a crosslinked network. Tannic acid is incorporated into the crosslinked network structure. The reaction is carried out at a constant temperature for 2 hours. The mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic acid monomer is 1:12.

[0058] 2) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 1), stir evenly, and spray dry to obtain the descaling agent, with the particle size controlled to be less than 40 mesh.

[0059] Comparative Example 1

[0060] Remove enzymatically hydrolyzed lignin, amino acids, and glyoxal, and increase the remaining raw materials proportionally. The other conditions in the preparation of the degumming agent are the same as in Example 3.

[0061] Comparative Example 2

[0062] In step 1), enzymatically hydrolyzed lignin, amino acids, and glyoxal are reacted to generate amino acid-modified lignin, which is then mixed with other raw materials for polymerization. The remaining conditions during the preparation of the degumming agent are the same as in Example 3. The preparation method of amino acid-modified lignin is as follows: Enzymatically hydrolyzed lignin is dissolved in an aqueous sodium hydroxide solution, lysine and glyoxal are added, and the mixture is stirred at 50°C for 6 hours. The pH of the reaction solution is then adjusted to neutral with hydrochloric acid, and the mixture is dried to obtain amino acid-modified lignin.

[0063] Comparative Example 3

[0064] Tannic acid was removed, and the remaining raw materials were increased proportionally. The other conditions in the preparation of the degumming agent were the same as in Example 3.

[0065] Comparative Example 4

[0066] The polyethylene glycol diacrylate was replaced with dimethylaminoethyl methacrylate, the crosslinking agent was replaced with N,N-methylenebisacrylamide, and the remaining conditions in the preparation of the degumming agent were the same as in Example 3.

[0067] The deflocculants obtained in Examples 1-5 and Comparative Examples 1-3 were used in the preparation of ceramic blanks: the amount of deflocculant was 0.075 wt% of the dry ceramic slurry, and it was ball-milled with the raw materials to form a slurry with a water content of 35 wt%. The slurry was then divided into two portions. The first portion was left to stand for 30 seconds, and its outflow time was measured and recorded as t1. The second portion was left to stand for 30 minutes, and its outflow time was measured and recorded as t2. The outflow time was measured using a Forte 4 viscometer.

[0068] Table 1

[0069]

[0070] As shown in Table 1, compared with Comparative Examples 1-4, the degumming agent provided by the present invention has excellent degumming effect. It can maintain high fluidity over time and adapt to water quality conditions with high metal cation content, and the thixotropy of the mud is greatly improved. The components in the degumming agent provided by the present invention play a complementary role. Using a small amount of degumming agent can significantly improve the fluidity of the mud and greatly improve the thixotropy of the mud.

[0071] 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 degumming agent for improving the thixotropic properties of mud, characterized in that, The raw materials include the following parts by weight: 5-12 parts enzymatically hydrolyzed lignin, 3-10 parts amino acids, 3-10 parts glyoxal, 6-15 parts methylene phosphate, 6-15 parts polyoxyethylene ether, 5-10 parts polyethylene glycol diacrylate, 5-10 parts acrylic acid monomer, 1.5-5 parts cyclotriphosphazene crosslinking agent, 1-5 parts silicate, and 0.5-3 parts tannic acid; The preparation method of the deflocculant that can improve the thixotropic properties of mud includes the following steps: 1) Dissolve the enzymatically hydrolyzed lignin in sodium hydroxide solution, and then dissolve the enzymatically hydrolyzed lignin solution together with amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomer, crosslinking agent, initiator, and tannic acid in a solvent and mix thoroughly. 2) Under ultraviolet light irradiation, the temperature is raised to 40-70℃, and the enzymatic hydrolysis of lignin solution, amino acids, glyoxal, polyethylene glycol diacrylate, acrylic monomer and crosslinking agent are initiated to form a crosslinked network. Tannic acid is doped in the crosslinked network structure. 3) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 2), stir evenly, and spray dry to obtain the degumming agent.

2. The deflocculant for improving the thixotropic properties of mud according to claim 1, characterized in that, The amino acids include one or more of the following: lysine, threonine, leucine, methionine, tryptophan, phenylalanine, arginine, and histidine.

3. A degumming agent for improving the thixotropic properties of mud according to claim 1, characterized in that, The methylene phosphate includes one or more of the following: hydroxyethylidene diphosphonate, aminotrimethylidene phosphate, diethylenetriaminepentamethylidene phosphonate, dihexenetriaminepentamethylidene phosphonic acid, hexamethylenediaminetetramethylidene phosphonate potassium salt, and ethylenediaminetetramethylidene phosphate.

4. A degumming agent for improving the thixotropic properties of mud according to claim 1, characterized in that, The polyoxyethylene ether comprises one or more of alkylphenol polyoxyethylene ether, polyethylene glycol alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene octylphenol ether, and carbon fatty alcohol polyoxyethylene ether.

5. A degumming agent for improving the thixotropic properties of mud according to claim 1, characterized in that, The acrylic monomer includes one or more of butenadic acid, acrylic acid, and methacrylic acid.

6. A method for preparing a degumming agent for improving thixotropic properties of mud as described in any one of claims 1-5, characterized in that, Includes the following steps: 1) Dissolve the enzymatically hydrolyzed lignin in sodium hydroxide solution, and then dissolve the enzymatically hydrolyzed lignin solution together with amino acids, glyoxal, polyethylene glycol diacrylate, acrylic acid monomer, crosslinking agent, initiator, and tannic acid in a solvent and mix thoroughly. 2) Under ultraviolet light irradiation, the temperature is raised to 40-70℃, and the enzymatic hydrolysis of lignin solution, amino acids, glyoxal, polyethylene glycol diacrylate, acrylic monomer and crosslinking agent are initiated to form a crosslinked network. Tannic acid is doped in the crosslinked network structure. 3) After the reaction is complete, add methylene phosphate and polyoxyethylene ether to the mixed solution obtained in step 2), stir evenly, and spray dry to obtain the degumming agent.

7. A method for preparing a degumming agent that can improve the thixotropic properties of mud according to claim 6, characterized in that, The solvent mentioned in step 1) includes one or more of the following: water, tetrahydrofuran, acetonitrile, N,N-dimethylformamide, and dimethyl sulfoxide; The initiator includes one or more of 2-hydroxy-methylphenylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, and 2-hydroxy-2-methylpropanone.

8. A method for preparing a degumming agent that can improve the thixotropic properties of mud according to claim 6, characterized in that, The mass ratio of the initiator to the sum of the masses of polyethylene glycol diacrylate and acrylic monomers in step 1) is 1:2-20.

9. A method for preparing a degumming agent that can improve the thixotropic properties of mud according to claim 6, characterized in that, The polymerization reaction time in step 2) is 1-5 hours.

10. A method for preparing a degumming agent that can improve the thixotropic properties of mud according to claim 6, characterized in that, The particle size of the degumming agent obtained in step 3) is less than 30 mesh.

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