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CN-121990834-A - Compound water glass dispersing agent for ceramic pugs and preparation method thereof

CN121990834ACN 121990834 ACN121990834 ACN 121990834ACN-121990834-A

Abstract

The application relates to the technical field of ceramic dispersing agents, and particularly discloses a compound water glass dispersing agent for ceramic pugs and a preparation method thereof. The preparation raw materials of the compound water glass dispersing agent for the ceramic pug comprise water glass, a high polymer containing multiple carboxyl groups, modified fatty alcohol-polyoxyethylene ether, aliphatic isocyanate and inorganic salt dispergator, wherein the preparation raw materials of the modified fatty alcohol-polyoxyethylene ether comprise fatty alcohol-polyoxyethylene ether, amino acid and an activating agent, and the weight ratio of the fatty alcohol-polyoxyethylene ether to the amino acid is 1 (1.2-1.5) (1-1.2). The complex water glass dispersing agent under the multi-element complex of the application has better dispersing effect.

Inventors

  • ZHANG XINYANG
  • GONG HAIYAN
  • ZHANG XINGPING
  • FU HUIKAI

Assignees

  • 佛山市南海区锐翔科技有限公司

Dates

Publication Date
20260508
Application Date
20260114

Claims (10)

  1. 1. The compound water glass dispersing agent for the ceramic pug is characterized by being prepared from the following raw materials in parts by weight: 10-20 parts of water glass, 7-10 parts of high polymer containing multiple carboxyl groups, 2-4 parts of modified fatty alcohol polyoxyethylene ether, 2.2-2.7 parts of aliphatic isocyanate, 1-1.5 parts of inorganic salt dispergator and 35-45 parts of water; The preparation raw materials of the modified fatty alcohol-polyoxyethylene ether comprise fatty alcohol-polyoxyethylene ether, amino acid and an activating agent, wherein the weight ratio of the fatty alcohol-polyoxyethylene ether to the amino acid is 1 (1.2-1.5) (1-1.2).
  2. 2. The compound water glass dispersing agent for ceramic pugs according to claim 1, wherein the preparation method of the modified fatty alcohol-polyoxyethylene ether comprises the following steps: (1) Dissolving an activating agent in a solvent to form an activating agent solution, dissolving fatty alcohol polyoxyethylene ether in the solvent, adding an alkali catalyst, adding the activating agent solution under ice bath, stirring at a low temperature for reaction for 14-16h, and filtering to remove insoluble salts after the reaction is completed to obtain an activated fatty alcohol polyoxyethylene ether filtrate; (2) Dissolving amino acid in a solvent, adding alkali, stirring uniformly, adding activated fatty alcohol polyoxyethylene ether filtrate, stirring at 60-80 ℃ in a dark place for reaction for 14-16h, filtering, evaporating and concentrating after the reaction is finished, adding diethyl ether to separate out precipitate, removing impurities in the precipitate by a dialysis method, and drying to obtain the modified fatty alcohol polyoxyethylene ether.
  3. 3. The compound water glass dispersant for ceramic pugs according to claim 1, wherein the activator in the step (1) is p-toluenesulfonyl chloride.
  4. 4. The compound water glass dispersant for ceramic pugs according to claim 1, wherein said amino acid comprises one or both of histidine and serine.
  5. 5. The compound water glass dispersant for ceramic pugs according to claim 1, wherein said amino acids comprise histidine and serine in a weight ratio of 1 (1-1.2).
  6. 6. The compound water glass dispersant for ceramic pugs according to claim 1, wherein the aliphatic isocyanate is one or both of n-heptyl isocyanate and n-hexyl isocyanate.
  7. 7. The compound water glass dispersant for ceramic pugs according to claim 1, wherein said high molecular polymer containing multiple carboxyl groups comprises one or more of polyacrylic acid, sodium polyacrylate and ammonium polyacrylate.
  8. 8. The compound water glass dispersing agent for ceramic pugs according to claim 1, wherein the inorganic salt dispergator comprises one or two of sodium tripolyphosphate and sodium hexametaphosphate.
  9. 9. The compound water glass dispersing agent for ceramic pugs according to claim 1, wherein the modulus of the water glass is 2.2-2.5, and the solid content is 40% -45%.
  10. 10. The preparation method of the compound water glass dispersing agent for ceramic pugs according to any one of claims 1 to 9 is characterized by comprising the following steps: Dissolving modified fatty alcohol polyoxyethylene ether in a solvent, adding aliphatic isocyanate under the protection of nitrogen, heating to 50-70 ℃, stirring for reaction for 2-4 hours, adding diethyl ether after the reaction is completed to separate out precipitate, removing impurities in the precipitate by a dialysis method, and drying to obtain precipitate; Dissolving water glass in water, heating to 85-95 ℃, adding a high molecular polymer containing multiple carboxyl groups, the precipitate and an inorganic salt dispergator, and uniformly stirring to obtain the compound water glass dispersing agent for ceramic pugs.

Description

Compound water glass dispersing agent for ceramic pugs and preparation method thereof Technical Field The invention relates to the technical field of ceramic dispersing agents, in particular to a compound water glass dispersing agent for ceramic pugs and a preparation method thereof. Background In the preparation process of the ceramic product, the dispersibility and the fluidity of the pug are key factors affecting the quality and the uploading efficiency of the product. To improve the properties of the pugs, it is often necessary to add dispersants. The dispersing agent acts on solid particles in the pug to reduce agglomeration among the particles, so that good fluidity is realized under lower water content, the follow-up grouting and forming processes are facilitated, the drying energy consumption can be reduced, and the green strength is improved. In the prior art, water glass is a widely used traditional inorganic dispersing agent, and has universality due to wide sources and low cost. However, the single use of water glass as a dispersing agent has a plurality of limitations that firstly, the dispersing effect is limited, a large adding amount is needed to achieve the process requirement of the fluidity of the pug, the production cost is directly increased, secondly, the excessive addition of the water glass easily causes unstable pug performance and even thickening phenomenon, and sodium ions contained in the water glass possibly influence the whiteness of a ceramic blank, the surface of the product is grey, and finally the quality and the quality of the product are influenced. Disclosure of Invention In order to improve the dispersing effect of the dispersing agent, the application provides a compound water glass dispersing agent for ceramic pugs and a preparation method thereof. In a first aspect, the application provides a compound water glass dispersing agent for ceramic pugs, which adopts the following technical scheme: The compound water glass dispersing agent for ceramic pugs comprises, by weight, 10-20 parts of water glass, 7-10 parts of high-molecular polymer containing multiple carboxyl groups, 2-4 parts of modified fatty alcohol polyoxyethylene ether, 2.2-2.7 parts of aliphatic isocyanate, 1-1.5 parts of inorganic salt dispergator and 35-45 parts of water; The preparation raw materials of the modified fatty alcohol-polyoxyethylene ether comprise fatty alcohol-polyoxyethylene ether, amino acid and an activating agent, wherein the weight ratio of the fatty alcohol-polyoxyethylene ether to the amino acid is 1 (1.2-1.5) (1-1.2). By adopting the technical scheme, the compound water glass dispersing agent under the multielement compounding shows the optimal dispersing effect, and the compounding mechanism is that the effects of complexing metal cations, neutralizing charges, increasing electrostatic repulsive force and hydrophilic groups of each dispersing component and increasing the surface lubricity of particles are synergistically complemented to realize the synergistic dispersing effect. The water glass can wrap ceramic pug particles to generate a certain lubrication effect, and silicate anions in various forms are formed after the silicate anions are dissociated in water to play roles of complexing metal cations and enhancing electronegativity of the surfaces of the particles. In addition, the water glass has certain alkalinity, and ceramic particles with more negative charges in an alkaline environment have stronger dispersibility compared with a neutral environment, so that the dispersibility of the ceramic particles is promoted. The anchoring groups in the modified fatty alcohol-polyoxyethylene ether can be adsorbed on the surfaces of ceramic particles, and long fatty chains can be fully stretched in a medium to form a steric hindrance stabilizing layer which serves as a stabilizing part to prevent collision focusing and gravity sedimentation between ceramic particles. Specifically, hydroxyl at the tail end of the fatty alcohol-polyoxyethylene ether is converted into a group with high reactivity through an activating agent, and then the hydroxyl is subjected to substitution reaction with carboxyl in amino acid, so that the amino acid is introduced into a polymer molecular chain, the amino acid is combined with aliphatic isocyanate, and a plurality of powerful anchoring groups are introduced, so that the multi-point anchoring effect on the surface of particles is enhanced, and the adsorption is firmer and more stable. Preferably, the preparation method of the modified fatty alcohol-polyoxyethylene ether comprises the following steps: (1) Dissolving an activating agent in a solvent to form an activating agent solution, dissolving fatty alcohol polyoxyethylene ether in the solvent, adding an alkali catalyst, adding the activating agent solution, stirring at room temperature for reaction for 14-16h, and filtering to remove insoluble salts after the reaction is completed to obtain an activat