Methods for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects

Abstract

This invention relates to a method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects. The method includes the following steps: mixing a magnesium-containing compound, a silicon-containing compound, a modified compound, and an additive, wherein the additive is one or more of a complexing agent, a dispersant, and a steric hindrance agent. After meeting the reaction conditions, the mixture is transferred to a pressure vessel. After the reaction is complete, the mixture is removed, cooled, and dried to obtain the high-viscosity magnesium silicate and its derivatives. The beneficial effects are: This invention utilizes the complexing agent and the barrier effect of the dispersant to intensify the hydration reaction during grinding, avoiding particle aggregation and condensation. This ensures thorough mixing of magnesium, silicon, and other reactants, meeting the chemical reaction conditions. It can replace bentonite to achieve a higher thickening effect, and the product can be made into a colorless and transparent thickening solution. Specifically, a 2 t% aqueous solution can form a gel-like jelly with complete swelling, resulting in a wider range of applications and a better market prospect.

Description

Technical Field

[0001] This invention relates to the field of magnesium silicate and its derivatives synthesis, specifically to a method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects. Background Technology

[0002] The synthesis of magnesium silicate and its derivatives (specifically, products with water dispersibility) is mainly based on ionic reactions. The core patent is owned by Lockwood Corporation. Although countries such as Japan have adopted the dissolution-reprecipitation route to avoid the corresponding patent restrictions, they have never avoided the ionic reaction route. After several years of development, patents 201910983804.0 and 201910984765.6 cleverly utilize the complexation effect and reaction size effect of viscosity reducers to realize the solid-phase reaction process of magnesium oxide and silicon, which is expected to open up a green development path. However, the addition of viscosity reducers often leads to a decrease in product viscosity, which cannot better meet the production needs of some special thickening applications. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for synthesizing high-viscosity magnesium silicate and its derivatives by utilizing complexation and dispersion effects, so as to overcome the shortcomings of the prior art.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A method for synthesizing high-viscosity magnesium silicate and its derivatives by utilizing complexation and dispersion effects, comprising the following steps:

[0005] A magnesium-containing compound, a silicon-containing compound, a modified compound, and an additive are mixed together. The additive is one or more of a complexing agent, a dispersant, and a steric hindrance agent. After the reaction conditions are met, the mixture is transferred to a pressure vessel. After the reaction is completed, the mixture is taken out, cooled, and dried to obtain high-viscosity magnesium silicate and its derivatives.

[0006] The reaction conditions include the following:

[0007] If the particle sizes of the magnesium-containing compound, silicon-containing compound, modified compound, and complexing agent all meet the production requirements, then a mixed reaction will be carried out.

[0008] If the particle size of magnesium compounds, modified compounds, or complexing agents does not meet production requirements, one or more raw materials will be ground until the particle size meets production requirements.

[0009] If the particle size of magnesium-containing compounds, silicon-containing compounds, modified compounds, or complexing agents does not meet production requirements, and grinding one or more raw materials still cannot meet the particle size requirements, then a silicon-magnesium reaction should be carried out first to generate non-adhesive or adhesive but opaque magnesium silicate and its derivatives. Then, the magnesium silicate and its derivatives should be ground until the particle size meets the production requirements.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the particle size must meet production requirements, meaning that silicon, magnesium, magnesium silicoes and other reactive elements must have sufficient hydroxyl groups and water molecules in the reaction process, and the particle size must be less than 5 μm.

[0012] Furthermore, the complexing agents include: phosphates, alkanolamines, aminocarboxylates, hydroxycarboxylates, organophosphonates, and polyacrylic acids. In order to obtain a viscous product, the complexing agent should lose its viscosity-reducing effect after the reaction in the reactor.

[0013] Dispersants include: anionic dispersants, cationic dispersants, nonionic dispersants, amphoteric dispersants, electrically neutral dispersants, polymeric dispersants, and controlled free radical dispersants;

[0014] The steric hindrance is a polymer compound.

[0015] Furthermore, the polymer is polyvinylpyrrolidone.

[0016] Furthermore, a pH adjuster is added during the mixing process of magnesium-containing compounds, silicon-containing compounds, modified compounds, and additives.

[0017] Furthermore, pH adjusters include inorganic acids, inorganic bases, organic acids, and organic bases, and are required not to introduce other impurity ions into the reaction products or generate excess phase byproducts.

[0018] Furthermore, the magnesium-containing compound is one or more of magnesium oxide, magnesium hydroxide, magnesium carbonate, and basic magnesium carbonate.

[0019] Furthermore, the silicon-containing compound is one or more of silicon dioxide, silica sol, sodium silicate, potassium silicate, lithium silicate, sodium fluorosilicate, potassium fluorosilicate, lithium fluorosilicate, and magnesium fluorosilicate.

[0020] Furthermore, the modified compound is one or more of the following: lithium-containing compounds, boron-containing compounds, carbon-containing compounds, nitrogen-containing compounds, fluorine-containing compounds, sodium-containing compounds, aluminum-containing compounds, phosphorus-containing compounds, sulfur-containing compounds, chlorine-containing compounds, potassium-containing compounds, titanium-containing compounds, vanadium-containing compounds, chromium-containing compounds, manganese-containing compounds, iron-containing compounds, cobalt-containing compounds, nickel-containing compounds, copper-containing compounds, and zinc-containing compounds.

[0021] Based on the above technical solution, the present invention also provides a high-viscosity magnesium silicate and its derivatives, which are synthesized by the above method.

[0022] Furthermore, high-viscosity magnesium silicate and its derivatives are soluble in water and appear as transparent liquids.

[0023] The beneficial effects of this invention are:

[0024] 1) This invention utilizes the complexing agent and the dispersant barrier effect to intensify the hydration reaction during the grinding process, avoiding particle aggregation and condensation, and achieving full mixing of reactants such as magnesium and silicon to meet the chemical reaction conditions. It can replace bentonite to achieve a higher thickening effect, and the product can be made into a colorless and transparent thickening solution. Specifically, a 2 t% aqueous solution can form a gel-like jelly with a complete swelling rate, which has a wider range of applications and a better market prospect.

[0025] 2) The raw materials for production are widely available; both active and inactive raw materials can be selected.

[0026] 3) The production process is simple, the production cost is low, and it is easy to promote industrial production. Attached Figure Description

[0027] Figure 1 The production flow chart shows that the particle size described in Embodiment 1 of this invention meets the production requirements.

[0028] Figure 2 The production flow chart for the particle size not meeting production requirements described in Embodiment 2 of the present invention is shown below.

[0029] Figure 3 This is a production flow chart for Embodiment 3 of the present invention, showing that the particle size does not meet the production requirements and the raw materials are ground but the particle size still does not meet the production requirements. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] Example 1

[0032] like Figure 1 As shown, a method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects includes the following steps:

[0033] Activated magnesium oxide (MgO-150) was dispersed in water. After hydration, magnesium hydroxide colloid with a particle size of less than 1 μm was formed. EDTA (ethylenediaminetetraacetic acid: complexing agent) was added, followed by silica sol and sodium aluminate (modifying compound). The mixture was stirred until it reached a viscous consistency, poured into a frame, and pushed into a pressure vessel. The reaction was carried out at a temperature greater than 150°C and a pressure greater than 0.5 MPa. After the reaction, the product was removed and dried to obtain magnesium aluminum silicate. In this embodiment, since the selected raw materials themselves contain sodium ions, the pH can meet the reaction requirements, so there is no need to add a pH adjuster.

[0034] Example 2

[0035] like Figure 2 As shown, a method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects includes the following steps:

[0036] Magnesium hydroxide was dispersed in water, sodium fluoride was added, followed by polyvinylpyrrolidone (steric hindrance agent) and polyethylene glycol (dispersant). In this embodiment, the steric hindrance agent also has a complexing function. With the assistance of polyethylene glycol, the magnesium hydroxide was prevented from agglomerating during the subsequent grinding process, thus meeting the reaction requirements. After grinding until the particle size met the production requirements (magnesium hydroxide particles are relatively large, so they need to be ground to a particle size of less than 5 μm), fumed silica was added, and the pH was adjusted with citric acid (which decomposes into nano-carbon at high temperature). The mixture was stirred until it became viscous, poured into a frame, and allowed to solidify. Water was then added to submerge the surface layer, and the mixture was pushed into a pressure vessel. The reaction was carried out at a temperature greater than 150°C and a pressure greater than 0.5 MPa. After the reaction, the product was removed and dried to obtain nano-carbon modified magnesium fluorosilicate.

[0037] Example 3

[0038] like Figure 3 As shown, a method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects includes the following steps:

[0039] Basic magnesium carbonate, silica, basic copper carbonate (modified compound), and sodium polyacrylate (dispersant) are dispersed in water. The dispersant used in this embodiment has a certain complexing effect, ensuring that the basic magnesium carbonate and silica will not agglomerate during the subsequent grinding process. This achieves the first step reaction to generate non-adhesive or adhesive but opaque magnesium silicate and its derivative materials. After emulsification, the materials are ground until the particle size meets the production requirements. Urea is added to adjust the pH of the reaction process. The mixture is poured into a frame and pushed into a pressure vessel. After reacting at room temperature and pressure, the mixture is removed, generating non-adhesive or adhesive but opaque magnesium silicate and its derivative materials. Water is added and the mixture is ground again until the particle size meets the requirements. The mixture is then pushed into a pressure vessel again and reacted at a temperature greater than 150°C and a pressure greater than 0.5 MPa. After drying, the magnesium silicate derivative product, magnesium copper silicate, is obtained.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects, characterized in that, Includes the following steps: A magnesium-containing compound, a silicon-containing compound, a modified compound, and an additive are mixed together. The additive is one or two of a complexing agent and a steric hindrance agent. After the reaction conditions are met, the mixture is transferred to a pressure vessel. After the reaction is completed, the mixture is taken out, cooled, and dried to obtain high-viscosity magnesium silicate and its derivatives. The reaction conditions include the following: If the particle sizes of the magnesium-containing compound, silicon-containing compound, modified compound, and complexing agent all meet the production requirements, then a mixed reaction will be carried out. If the particle size of magnesium compounds, modified compounds, or complexing agents does not meet production requirements, one or more raw materials will be ground until the particle size meets production requirements. The required particle size meets production requirements: silicon, magnesium, and other reactive element raw materials must have sufficient hydroxyl groups and water molecule structures during the reaction process, and the particle size must be less than 5 μm. The complexing agents include: phosphates, alkanolamines, aminocarboxylates, hydroxycarboxylates, organophosphonates, or polyacrylic acids; The steric hindrance agent is polyvinylpyrrolidone.

2. The method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects according to claim 1, characterized in that, A pH adjuster is added during the mixing of magnesium-containing compounds, silicon-containing compounds, modified compounds, and additives.

3. The method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects according to claim 2, characterized in that, The pH adjuster includes inorganic acids, inorganic bases, organic acids or organic bases, and is required not to introduce other impurity ions into the reaction product or generate excess phase byproducts.

4. The method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects according to claim 1, characterized in that, The magnesium-containing compound is one or more of magnesium oxide, magnesium hydroxide, magnesium carbonate, and basic magnesium carbonate.

5. The method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects according to claim 1, characterized in that, The silicon-containing compound is one or more of silicon dioxide, silica sol, sodium silicate, potassium silicate, lithium silicate, sodium fluorosilicate, potassium fluorosilicate, lithium fluorosilicate, and magnesium fluorosilicate.

6. The method for synthesizing high-viscosity magnesium silicate and its derivatives using complexation and dispersion effects according to claim 1, characterized in that, The modified compound is one or more of the following: lithium-containing compounds, boron-containing compounds, carbon-containing compounds, nitrogen-containing compounds, fluorine-containing compounds, sodium-containing compounds, aluminum-containing compounds, phosphorus-containing compounds, sulfur-containing compounds, chlorine-containing compounds, potassium-containing compounds, titanium-containing compounds, vanadium-containing compounds, chromium-containing compounds, manganese-containing compounds, iron-containing compounds, cobalt-containing compounds, nickel-containing compounds, copper-containing compounds, and zinc-containing compounds.

7. A high-viscosity magnesium silicate and its derivatives, characterized in that, Synthesized by the method described in any one of claims 1 to 6.

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