Compound water glass dispersing agent for ceramic pug and preparation method of compound water glass dispersing agent
By using a combination of compound water glass dispersants, the limitations of single water glass dispersants are overcome, achieving good fluidity and green strength of ceramic clay at low moisture content, thus improving the quality of ceramic products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FOSHAN NANHAI RUIXIANG TECH CO LTD
- Filing Date
- 2026-01-14
- Publication Date
- 2026-05-08
AI Technical Summary
The existing technology of using water glass alone as a ceramic clay dispersant has problems such as limited dispersion effect, increased cost due to large addition amount, unstable clay performance and impact on the whiteness of ceramic body.
A compound water glass dispersant, including water glass, modified fatty alcohol polyoxyethylene ether, aliphatic isocyanate, inorganic salt decolloid, and other components, is used to improve the dispersion performance of ceramic particles by complexing metal cations, neutralizing charges to increase electrostatic repulsion, and the synergistic effect of hydrophilic groups.
It achieves good fluidity of ceramic clay at low moisture content, reduces drying energy consumption, improves green body strength, avoids the increased cost and performance instability caused by using water glass alone, and improves the quality and appearance of ceramic products.
Abstract
Description
Technical Field
[0001] This invention relates to the field of ceramic dispersant technology, and in particular to a compound water glass dispersant for ceramic clay and its preparation method. Background Technology
[0002] In the preparation of ceramic products, the dispersibility and flowability of the clay are key factors affecting product quality and production efficiency. To improve the performance of the clay, dispersants are typically added. Dispersants act on the solid particles in the clay, reducing particle agglomeration and achieving good flowability at lower moisture content. This not only benefits subsequent slip casting and molding processes but also reduces drying energy consumption and improves green body strength.
[0003] In existing technologies, water glass is a widely used traditional inorganic dispersant due to its abundant availability and low cost. However, using water glass alone as a dispersant has several limitations: First, its dispersion effect is limited, and a large amount is often required to achieve the required flowability of the clay, directly increasing production costs; second, excessive addition of water glass can easily cause instability in the clay properties, even thickening, and its sodium ions may affect the whiteness of the ceramic body, causing the product surface to turn gray, ultimately affecting the product's quality and appearance. Summary of the Invention
[0004] To improve the dispersion effect of dispersants, this application provides a compound water glass dispersant for ceramic clay and its preparation method.
[0005] Firstly, this application provides a compound water glass dispersant for ceramic clay, employing the following technical solution: A compound water glass dispersant for ceramic clay, comprising the following components by weight: 10-20 parts water glass, 7-10 parts polycarboxyl-containing polymer, 2-4 parts modified fatty alcohol polyoxyethylene ether, 2.2-2.7 parts aliphatic isocyanate, 1-1.5 parts inorganic salt decolloiding agent, and 35-45 parts water. The raw materials for preparing the modified fatty alcohol polyoxyethylene ether include fatty alcohol polyoxyethylene ether, amino acids and activators, and the weight ratio of fatty alcohol polyoxyethylene ether to amino acids is 1:(1.2-1.5):(1-1.2).
[0006] By adopting the above technical solution, the compound water glass dispersant under the multi-component compounding exhibits the best dispersion effect. Its compounding mechanism is that the complex metal cations and neutral charges of each dispersion component increase electrostatic repulsion and the hydrophilic groups increase the surface lubricity of particles, thus achieving a synergistic dispersion effect.
[0007] Water glass can encapsulate ceramic clay particles, providing a certain degree of lubrication. Simultaneously, after dissociating in water, it forms various forms of silicate anions, which can complex metal cations and enhance the electronegativity of the particle surface. Furthermore, water glass has a certain alkalinity; ceramic particles carrying more negative charges in an alkaline environment exhibit stronger dispersibility compared to a neutral environment, thus promoting the dispersion performance of ceramic particles.
[0008] The anchoring groups in modified fatty alcohol polyoxyethylene ether can adsorb onto the surface of ceramic particles. The long aliphatic chains can fully extend in the medium, forming a steric stabilizing layer that acts as a stabilizing component, preventing collision focusing and gravitational sedimentation between ceramic particles. Specifically, an activator converts the terminal hydroxyl groups of the fatty alcohol polyoxyethylene ether into highly reactive groups, which then undergo a substitution reaction with the carboxyl groups in amino acids. This introduces amino acids into the polymer molecular chain. The amino acids combine with aliphatic isocyanates, introducing multiple strong anchoring groups, enhancing the multi-point anchoring effect on the particle surface, resulting in stronger and more stable adsorption.
[0009] Preferably, the preparation method of the modified fatty alcohol polyoxyethylene ether includes the following steps: (1) Dissolve the activator in the solvent to form an activator solution, dissolve the fatty alcohol polyoxyethylene ether in the solvent, add the alkaline catalyst, add the activator solution, stir the reaction at room temperature for 14-16 h, filter to remove insoluble salt after the reaction is completed, and obtain activated fatty alcohol polyoxyethylene ether filtrate. (2) Dissolve the amino acid in the solvent, add the alkali, stir evenly, add the activated fatty alcohol polyoxyethylene ether filtrate, stir and react at 60-80℃ in the dark for 14-16h, filter, evaporate and concentrate after the reaction is completed, add diethyl ether to precipitate, remove the impurities in the precipitate by dialysis, and dry to obtain modified fatty alcohol polyoxyethylene ether.
[0010] Preferably, the activator in step (1) is p-toluenesulfonyl chloride.
[0011] By adopting the above technical solution, the terminal hydroxyl groups of fatty alcohol polyoxyethylene ether react with toluenesulfonyl chloride to generate highly active toluenesulfonate. The carboxyl anion in the amino acid replaces the sulfonate group to form an ester bond, thereby introducing the amino acid into the polymer molecular chain so as to combine with aliphatic isocyanate. This further reduces the agglomeration between solid particles in the clay, improves the fluidity of the clay at lower moisture content, which is beneficial to subsequent slurry casting and molding processes, reduces drying energy consumption, and improves the strength of the green body. At the same time, it avoids the problems of increased cost, unstable clay performance, thickening phenomenon and impact on the whiteness of ceramic body caused by the large amount of water glass added when using water glass as a dispersant alone, thus improving the quality and appearance of ceramic products.
[0012] Preferably, the amino acid includes one or both of histidine and serine.
[0013] Preferably, the amino acids comprise histidine and serine in a weight ratio of 1:(1-1.2).
[0014] Preferably, the aliphatic isocyanate is one or both of n-heptyl isocyanate and n-hexyl isocyanate.
[0015] By adopting the above technical solution, histidine contains an imidazole ring and an amino group. The two nitrogen atoms on the imidazole ring have lone pairs of electrons, which can act as a bidentate ligand to form a stable coordination bond with the metal cation, thereby adsorbing firmly onto the surface of ceramic particles. Serine contains a hydroxyl group and an amino group, both of which can undergo addition reactions with isocyanate groups, thereby introducing urethane groups and urea bonds into the polymer molecular chain, thereby enhancing the anchoring ability and improving the dispersion stability.
[0016] Preferably, the polymer containing multiple carboxyl groups includes one or more of polyacrylic acid, sodium polyacrylate, and ammonium polyacrylate.
[0017] By adopting the above technical solution, polyacrylic acid and polyacrylate contain a high proportion of strongly polar carboxylic acid groups, which can complex with metal ions on the surface of solid clay particles, forming a negatively charged adsorption layer on the particle surface. This generates electrostatic repulsion, reducing particle agglomeration. Simultaneously, the polymer chains create steric hindrance on the particle surface, further preventing particle aggregation and improving the dispersibility of the clay.
[0018] Preferably, the inorganic salt degumming agent includes one or both of sodium tripolyphosphate and sodium hexametaphosphate.
[0019] By adopting the above technical solution, the sodium tripolyphosphate and sodium hexametaphosphate first dissociate into polyphosphate ions when they come into contact with water. Over time, the polyphosphate ions will further hydrolyze to form shorter phosphate ions and eventually monophosphate ions. During the dissociation process, a large number of negatively charged phosphate ions will appear, which will help to increase the zeta potential of the solution. Therefore, the effect of complexing metal ions to prevent bridging between particles and increasing electrostatic repulsion is more significant, thus achieving better dispersion effect.
[0020] Preferably, the water glass has a modulus of 2.2-2.5 and a solid content of 40%-45%.
[0021] By adopting the above technical solution, the water glass with the above parameters provides just the right amount of oligomeric silicate ions for effective adsorption and stabilization.
[0022] Secondly, this application provides a method for preparing a compound water glass dispersant for ceramic clay, which adopts the following technical solution: A method for preparing a compound water glass dispersant for ceramic clay includes the following steps: The modified fatty alcohol polyoxyethylene ether was dissolved in a solvent, and aliphatic isocyanate was added under nitrogen protection. The mixture was heated to 50-70℃ and stirred for 2-4 hours. After the reaction was completed, diethyl ether was added to precipitate the precipitate. Impurities in the precipitate were removed by dialysis and the precipitate was dried to obtain the precipitate. Water glass is dissolved in water and heated to 85-95°C. A high molecular polymer containing multiple carboxyl groups, the precipitate, and an inorganic salt desiccant are added and stirred evenly to obtain a compound water glass dispersant for ceramic clay.
[0023] By adopting the above technical solution and the above preparation method, the compound water glass dispersant can reduce the agglomeration between solid particles in ceramic clay when applied to ceramic clay, achieve good fluidity at a low moisture content, which is beneficial to subsequent slurry casting and molding processes, and can also reduce drying energy consumption and improve green body strength.
[0024] This application has the following beneficial effects: The compounded water glass dispersant of this application exhibits the best dispersion effect under the multi-component compounding. Its compounding mechanism is that the complexed metal cations and neutralized charges of each dispersing component increase electrostatic repulsion, and the hydrophilic groups increase the lubricity of the particle surface, which synergistically complement each other to achieve a synergistic dispersion effect.
[0025] Water glass can encapsulate ceramic clay particles, providing a certain degree of lubrication. Simultaneously, after dissociating in water, it forms various forms of silicate anions, which can complex metal cations and enhance the electronegativity of the particle surface. Furthermore, water glass has a certain alkalinity; ceramic particles carrying more negative charges in an alkaline environment exhibit stronger dispersibility compared to a neutral environment, thus promoting the dispersion performance of ceramic particles.
[0026] The anchoring groups in modified fatty alcohol polyoxyethylene ether can adsorb onto the surface of ceramic particles. The long aliphatic chains can fully extend in the medium, forming a steric stabilizing layer that acts as a stabilizing component, preventing collision focusing and gravitational sedimentation between ceramic particles. Specifically, an activator converts the terminal hydroxyl groups of the fatty alcohol polyoxyethylene ether into highly reactive groups, which then undergo a substitution reaction with the carboxyl groups in amino acids. This introduces amino acids into the polymer molecular chain. The amino acids combine with aliphatic isocyanates, introducing multiple strong anchoring groups, enhancing the multi-point anchoring effect on the particle surface, resulting in stronger and more stable adsorption. Detailed Implementation
[0027] The present application will be further described in detail below with reference to the embodiments.
[0028] Preparation Example 1 The preparation method of modified fatty alcohol polyoxyethylene ether is as follows: (1) Dissolve 2 kg of p-toluenesulfonyl chloride in 2 L of anhydrous dichloromethane to form a p-toluenesulfonyl chloride solution. Dissolve 2 kg of fatty alcohol polyoxyethylene ether in 2 L of anhydrous dichloromethane. Add 0.012 kg of triethylamine. Add the p-toluenesulfonyl chloride solution dropwise under ice bath conditions. After the addition is complete, gradually restore to room temperature and stir the reaction for 14 h. After the reaction is complete, filter to remove the triethylamine salt precipitate to obtain activated fatty alcohol polyoxyethylene ether filtrate. (2) Dissolve 1.2 kg histidine and 1.2 kg serine in 2.4 L dimethylformamide, add 0.0072 kg potassium carbonate, stir evenly, add activated fatty alcohol polyoxyethylene ether filtrate, stir and react at 60 °C in the dark for 14 h. After the reaction is completed, filter, evaporate and concentrate to remove insoluble salts and solvents to obtain concentrated solution. Add diethyl ether to concentrated solution to precipitate, remove impurities in precipitate by dialysis to obtain modified fatty alcohol polyoxyethylene ether.
[0029] Among them, fatty alcohol polyoxyethylene ether is selected as AEO-9.
[0030] Preparation Example 2 The preparation method of modified fatty alcohol polyoxyethylene ether is as follows: (1) Dissolve 3.3 kg of p-toluenesulfonyl chloride in 3.3 L of anhydrous dichloromethane to form a p-toluenesulfonyl chloride solution. Dissolve 3 kg of fatty alcohol polyoxyethylene ether in 3 L of anhydrous dichloromethane. Add 0.019 kg of triethylamine. Add the p-toluenesulfonyl chloride solution dropwise under ice bath conditions. After the addition is complete, gradually restore to room temperature and stir the reaction for 15 h. After the reaction is complete, filter to remove the triethylamine salt precipitate to obtain activated fatty alcohol polyoxyethylene ether filtrate. (2) Dissolve 1.85 kg histidine and 2.05 kg serine in 3.9 L dimethylformamide, add 0.012 kg potassium carbonate, stir evenly, add activated fatty alcohol polyoxyethylene ether filtrate, stir and react at 70 °C in the dark for 15 h, filter, evaporate and concentrate to remove insoluble salt and solvent to obtain concentrated solution, add diethyl ether to concentrated solution to precipitate, remove impurities in precipitate by dialysis to obtain modified fatty alcohol polyoxyethylene ether.
[0031] Among them, fatty alcohol polyoxyethylene ether is selected as AEO-3.
[0032] Preparation Example 3 The preparation method of modified fatty alcohol polyoxyethylene ether is as follows: (1) Dissolve 4.8 kg of p-toluenesulfonyl chloride in 4.8 L of anhydrous dichloromethane to form a p-toluenesulfonyl chloride solution. Dissolve 4 kg of fatty alcohol polyoxyethylene ether in 4 L of anhydrous dichloromethane. Add 0.026 kg of triethylamine. Add the p-toluenesulfonyl chloride solution dropwise under ice bath conditions. After the addition is complete, gradually restore to room temperature and stir the reaction for 16 h. After the reaction is complete, filter to remove the triethylamine salt precipitate to obtain activated fatty alcohol polyoxyethylene ether filtrate. (2) Dissolve 2.73 kg histidine and 3.27 kg serine in 6 L of dimethylformamide, add 0.018 kg potassium carbonate, stir evenly, add activated fatty alcohol polyoxyethylene ether filtrate, stir and react at 80 °C in the dark for 16 h, filter, evaporate and concentrate to remove insoluble salts and solvents to obtain concentrated solution, add diethyl ether to concentrated solution to precipitate, remove impurities in precipitate by dialysis to obtain modified fatty alcohol polyoxyethylene ether.
[0033] Among them, fatty alcohol polyoxyethylene ether is selected as AEO-7.
[0034] Preparation Example 4 The difference between this preparation example and preparation example 2 is that histidine is replaced with serine by mass.
[0035] Preparation Example 5 The difference between this preparation example and preparation example 2 is that histidine is replaced with tyrosine by mass.
[0036] Preparation Example 6 The difference between this preparation example and Preparation Example 2 is that the fatty alcohol polyoxyethylene ether is replaced by polyethylene glycol monomethyl ether in equal mass.
[0037] Among them, polyethylene glycol monomethyl ether is selected from MPEG2000.
[0038] Preparation Example 7 The difference between this preparation example and Preparation Example 2 is that the fatty alcohol polyoxyethylene ether was not activated.
[0039] Example 1 A compound water glass dispersant for ceramic clay, comprising: 10 kg water glass, 7 kg polyacrylic acid, 2 kg modified fatty alcohol polyoxyethylene ether (prepared in Example 1), 2.2 kg n-heptyl isocyanate, 1 kg sodium hexametaphosphate, 35 kg water.
[0040] The water glass has a modulus of 2.2 and a solid content of 40%. The polyacrylic acid used was a commercially available product purchased from Shandong Kasong New Materials Co., Ltd. The preparation method of the compound water glass dispersant for ceramic clay includes the following steps: Modified fatty alcohol polyoxyethylene ether was dissolved in anhydrous dichloromethane. Under nitrogen protection, aliphatic isocyanate was added, and the mixture was heated to 50°C and stirred for 2 hours. After the reaction was completed, diethyl ether was added to precipitate the precipitate. Impurities in the precipitate were removed by dialysis and the precipitate was dried to obtain the precipitate. Water glass is dissolved in water and heated to 85°C. A high molecular polymer containing multiple carboxyl groups, the precipitate, and an inorganic salt desiccant are added and stirred evenly to obtain a compound water glass dispersant for ceramic clay.
[0041] Example 2 A compound water glass dispersant for ceramic clay, comprising: 15 kg water glass, 8.5 kg sodium polyacrylate, 3 kg modified fatty alcohol polyoxyethylene ether (prepared in Preparation Example 2), 2.5 kg n-heptyl isocyanate, 1.3 kg sodium tripolyphosphate, and 40 kg water.
[0042] The water glass has a modulus of 2.3 and a solid content of 42%. Sodium polyacrylate was selected from commercially available products and purchased from Jinan Zhongbei Fine Chemical Co., Ltd. The preparation method of the compound water glass dispersant for ceramic clay includes the following steps: Modified fatty alcohol polyoxyethylene ether was dissolved in a solvent, and aliphatic isocyanate was added under nitrogen protection. The mixture was heated to 60°C and stirred for 3 hours. After the reaction was completed, diethyl ether was added to precipitate the precipitate. Impurities in the precipitate were removed by dialysis and the precipitate was dried to obtain the precipitate. Water glass is dissolved in water and heated to 90°C. A high molecular polymer containing multiple carboxyl groups, the precipitate, and an inorganic salt desiccant are added and stirred evenly to obtain a compound water glass dispersant for ceramic clay.
[0043] Example 3 A compound water glass dispersant for ceramic clay, comprising: 20 kg water glass, 10 kg ammonium polyacrylate, 4 kg modified fatty alcohol polyoxyethylene ether (prepared in Preparation Example 3), 2.7 kg n-hexyl isocyanate, 1.5 kg sodium tripolyphosphate, and 45 kg water.
[0044] The water glass has a modulus of 2.3 and a solid content of 42%. The ammonium polyacrylate was selected from commercially available products and purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd. The preparation method of the compound water glass dispersant for ceramic clay includes the following steps: Modified fatty alcohol polyoxyethylene ether was dissolved in a solvent, and aliphatic isocyanate was added under nitrogen protection. The mixture was heated to 70°C and stirred for 4 hours. After the reaction was completed, diethyl ether was added to precipitate the precipitate. Impurities in the precipitate were removed by dialysis and the precipitate was dried to obtain the precipitate. Water glass is dissolved in water and heated to 95°C. A high molecular polymer containing multiple carboxyl groups, the precipitate, and an inorganic salt desiccant are added and stirred evenly to obtain a compound water glass dispersant for ceramic clay.
[0045] Example 4 The difference between this embodiment and Example 2 is that the modified fatty alcohol polyoxyethylene ether prepared in Example 4 is used.
[0046] Example 5 The difference between this embodiment and Example 2 is that the modified fatty alcohol polyoxyethylene ether prepared in Example 5 is used.
[0047] Example 6 The difference between this embodiment and Embodiment 2 is that the mass of n-heptyl isocyanate is replaced with hexamethylene diisocyanate.
[0048] Comparative Example 1 A compound water glass dispersant for ceramic clay differs from Example 2 in that it uses the modified fatty alcohol polyoxyethylene ether prepared in Preparation Example 6.
[0049] Comparative Example 2 A compound water glass dispersant for ceramic clay differs from Example 2 in that it uses the modified fatty alcohol polyoxyethylene ether prepared in Preparation Example 7.
[0050] Comparative Example 3 A compound water glass dispersant for ceramic clay differs from Example 2 in that the modified fatty alcohol polyoxyethylene ether is replaced by fatty alcohol polyoxyethylene ether by mass.
[0051] Among them, fatty alcohol polyoxyethylene ether is selected as AEO-3.
[0052] Comparative Example 4 A compound water glass dispersant for ceramic clay differs from Example 2 in that it does not contain n-heptyl isocyanate.
[0053] Comparative Example 5 A compound water glass dispersant for ceramic clay differs from Example 2 in that sodium tripolyphosphate is not added.
[0054] Comparative Example 6 A compound water glass dispersant for ceramic clay differs from Example 2 in that sodium polyacrylate is replaced by the modified fatty alcohol polyoxyethylene ether prepared in Example 2.
[0055] Comparative Example 7 A compound water glass dispersant for ceramic clay differs from Example 2 in that the modified fatty alcohol polyoxyethylene ether is replaced by sodium polyacrylate.
[0056] Performance testing The ceramic clay composition consists of 15% kaolin, 35% high-alumina clay, 20% bauxite, 15% ball clay, and 15% sand and gravel.
[0057] Preparation of ceramic clay: The above raw materials, water, and compound water glass dispersant for ceramic clay are loaded into a ball mill jar, and the water content of the slurry is controlled at 33%. The mixture is ball-milled for 15 minutes. The total amount of compound water glass dispersant added is 10% of the weight of the ceramic clay.
[0058] 1. Clay fluidity test: According to GB / T 1723—1993 "Determination of viscosity of coatings", take the ball-milled ceramic clay and let it stand for 30 s. Pour it into the Cotton-4 viscometer cup until it overflows. Scrape off the excess slurry on the surface so that the liquid level is flush with the upper cup opening. Open the valve of the lower cup opening and start timing simultaneously. Measure the time (s) it takes for the slurry to flow out of the Cotton-4 viscometer cup and mark it as the flow rate to indicate the fluidity of the clay.
[0059] 2. Flexural strength: The modulus of rupture and breaking strength shall be determined in accordance with GB / T 3810.4-2006, Part 4.
[0060] 3. Settling test: The prepared mud was inverted into a 50mL volumetric flask (t=0), and the settling height of the mud was measured at different times. The dispersion stability can be expressed by the relationship between the settling height and time. The settling degree after 2 days of aging was calculated.
[0061] Table 1 Discharge time / s Flexural strength / MPa Sedimentation / % Example 1 36 1.52 1.89 Example 2 35 1.54 1.85 Example 3 35 1.53 1.86 Example 4 37 1.50 1.92 Example 5 37 1.49 1.93 Example 6 38 1.47 2.00 Comparative Example 1 40 1.37 2.24 Comparative Example 2 42 1.35 2.32 Comparative Example 3 44 1.31 2.51 Comparative Example 4 43 1.34 2.33 Comparative Example 5 46 1.29 2.71 Comparative Example 6 44 1.32 2.48 Comparative Example 7 48 1.27 2.85
[0062] Based on the comparison between Example 2 and Example 6 and the data in Table 1, it can be seen that hexamethylene diisocyanate contains two isocyanate groups, which may cause a small portion of the mud to re-agglomerate, thereby reducing its dispersibility.
[0063] Based on the comparison between Example 2 and Comparative Example 1, and the data in Table 1, it can be seen that in Comparative Example 1, fatty alcohol polyoxyethylene ether was replaced with polyethylene glycol monomethyl ether. Polyethylene glycol monomethyl ether does not contain long aliphatic chains, so its dispersion effect is not as good as that of fatty alcohol polyoxyethylene ether. In this application, however, the long aliphatic chains can fully extend in the medium, forming a steric stabilizing layer, acting as a stabilizing component, and preventing collision focusing and gravitational settling between ceramic particles.
[0064] Based on the comparison between Example 2 and Comparative Example 2, and the data in Table 1, it can be seen that in Comparative Example 2, the terminal hydroxyl groups of the fatty alcohol polyoxyethylene ether were not activated, resulting in low reactivity. This led to poor quality of the synthesized modified fatty alcohol polyoxyethylene ether, affecting the performance of the compounded water glass dispersant and weakening its ability to reduce agglomeration between solid particles in ceramic clay, making it difficult to achieve good flowability at low moisture content. In contrast, this application uses p-toluenesulfonyl chloride to activate the terminal hydroxyl groups of the fatty alcohol polyoxyethylene ether, transforming the hydroxyl groups into sites with higher reactivity, forming stable linkages with amino acids, thereby synthesizing a higher quality modified fatty alcohol polyoxyethylene ether, which is beneficial for improving dispersion stability.
[0065] Based on the comparison of Example 2 and Comparative Examples 3-4, and the data in Table 1, it can be seen that: the fatty alcohol polyoxyethylene ether in Comparative Example 3 was not modified, resulting in a poorer effect on solid particles in the mud, and some agglomerates still existed in the mud. Furthermore, the unmodified fatty alcohol polyoxyethylene ether was not conducive to reducing drying energy consumption and improving green strength, and may also lead to unstable mud properties. Comparative Example 4 lacked heptyl isocyanate, resulting in insufficient anchoring sites and anchoring force in the polymer long chain. In contrast, this application modifies the fatty alcohol polyoxyethylene ether with amino acids and combines it with heptyl isocyanate. The synthesized polymer molecules have more anchoring sites, achieving multi-point anchoring, greatly enhancing the adsorption strength and stability on the particle surface, making it less susceptible to substitution or desorption, thus forming a stable steric hindrance layer, providing excellent steric stability, making the mud less prone to settling, maintaining good uniformity, and achieving a relatively long retention time.
[0066] Based on the comparison of Example 2 and Comparative Examples 5-7 and the data in Table 1, it can be seen that the polycarboxyl-containing polymer, modified fatty alcohol polyoxyethylene ether and inorganic salt desiccant in this application have a synergistic effect, and the combination of the three can exhibit the best dispersion effect.
[0067] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A compound water glass dispersant for ceramic clay, characterized in that, It is prepared from the following raw materials in parts by weight: 10-20 parts water glass, 7-10 parts high molecular polymer containing multiple carboxyl groups, 2-4 parts modified fatty alcohol polyoxyethylene ether, 2.2-2.7 parts aliphatic isocyanate, 1-1.5 parts inorganic salt decolloiding agent, and 35-45 parts water. The raw materials for preparing the modified fatty alcohol polyoxyethylene ether include fatty alcohol polyoxyethylene ether, amino acids and activators, and the weight ratio of fatty alcohol polyoxyethylene ether to amino acids is 1:(1.2-1.5):(1-1.2).
2. The compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The preparation method of the modified fatty alcohol polyoxyethylene ether includes the following steps: (1) Dissolve the activator in the solvent to form an activator solution, dissolve the fatty alcohol polyoxyethylene ether in the solvent, add the alkaline catalyst, add the activator solution under ice bath, stir the reaction at low temperature for 14-16h, filter to remove insoluble salt after the reaction is completed, and obtain activated fatty alcohol polyoxyethylene ether filtrate. (2) Dissolve the amino acid in the solvent, add the alkali, stir evenly, add the activated fatty alcohol polyoxyethylene ether filtrate, stir and react at 60-80℃ in the dark for 14-16h, filter, evaporate and concentrate after the reaction is completed, add diethyl ether to precipitate, remove the impurities in the precipitate by dialysis, and dry to obtain modified fatty alcohol polyoxyethylene ether.
3. The compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The activator in step (1) is p-toluenesulfonyl chloride.
4. The compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The amino acid includes one or both of histidine and serine.
5. The compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The amino acids include histidine and serine in a weight ratio of 1:(1-1.2).
6. The compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The aliphatic isocyanate is one or both of n-heptyl isocyanate and n-hexyl isocyanate.
7. The compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The polymer containing multiple carboxyl groups includes one or more of polyacrylic acid, sodium polyacrylate, and ammonium polyacrylate.
8. The compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The inorganic salt degumming agent includes one or both of sodium tripolyphosphate and sodium hexametaphosphate.
9. A compound water glass dispersant for ceramic clay according to claim 1, characterized in that, The water glass has a modulus of 2.2-2.5 and a solid content of 40%-45%.
10. A method for preparing a compound water glass dispersant for ceramic clay according to any one of claims 1-9, characterized in that, Includes the following steps: The modified fatty alcohol polyoxyethylene ether was dissolved in a solvent, and aliphatic isocyanate was added under nitrogen protection. The mixture was heated to 50-70℃ and stirred for 2-4 hours. After the reaction was completed, diethyl ether was added to precipitate the precipitate. Impurities in the precipitate were removed by dialysis and the precipitate was dried to obtain the precipitate. Water glass is dissolved in water and heated to 85-95°C. A high molecular polymer containing multiple carboxyl groups, the precipitate, and an inorganic salt desiccant are added and stirred evenly to obtain a compound water glass dispersant for ceramic clay.