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Method for modifying layered silicate powder by using silicon dioxide

A technology of silicate powder and layered silicate, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve problems such as high price and achieve the effect of reducing production costs

Active Publication Date: 2017-12-19
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, in the prior art, in the process of modifying layered silicates by using silica, either expensive organic solvents and alkoxysilanes need to be used, or simply mixed, which cannot achieve layered silicates well. The purpose of silica modification on silicate surface

Method used

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  • Method for modifying layered silicate powder by using silicon dioxide
  • Method for modifying layered silicate powder by using silicon dioxide
  • Method for modifying layered silicate powder by using silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Dilute water glass with modulus 3.24 of 3401 from Qingdao Dongyue Soda Soda Factory with deionized water to a solid content of 3%, and pass it through a cation exchange resin to obtain an orthosilicic acid solution. Add 1M sulfuric acid to the solution to adjust its pH to 1. After aging for 72 hours at room temperature, let it pass through the anion exchange resin first, and then immediately pass through the cation exchange resin to obtain an acidic activated orthosilicic acid solution.

[0048] Add 3% water glass to the acidic activated ortho silicic acid solution to adjust its pH to 10 to obtain an alkaline activated ortho silicic acid solution. Take 250ml of alkaline activated orthosilicic acid solution as the base solution, use the constant liquid level method to control the liquid temperature to 85°C, and add active silicic acid dropwise to it at a rate of 0.6ml / min, and add 200ml dropwise after 5 hours After acidic activation of the orthosilicic acid solution, lig...

Embodiment 2

[0052] Dilute water glass with modulus 3.24 of 3401 from Qingdao Dongyue Soda Soda Factory with deionized water to a solid content of 5%, and pass it through a cation exchange resin to obtain an orthosilicic acid solution. Add 1M hydrochloric acid to the solution to adjust its pH to 2. After aging at room temperature for 48 hours, let it pass through the anion exchange resin first, and then immediately pass through the cation exchange resin to obtain an acidic activated orthosilicic acid solution.

[0053] Add 1M sodium hydroxide solution to the acidic activated orthosilicic acid solution to adjust its pH to 8. Take 250ml of alkaline activated orthosilicic acid solution as the base solution, use the constant liquid level method to control the liquid temperature to 65°C, and add acidic activated orthosilicic acid solution dropwise at a rate of 0.4ml / min, after 8 hours And after adding 200ml of acidic activated orthosilicic acid solution dropwise, light blue opalescence appeared...

Embodiment 3

[0057] Dilute water glass with modulus 3.24 of 3401 from Qingdao Dongyue Soda Soda Factory with deionized water to a solid content of 4%, and pass it through a cation exchange resin to obtain an orthosilicic acid solution. Add 1M nitric acid to the solution to adjust its pH to 2. After aging at room temperature for 48 hours, let it pass through the anion exchange resin first, and then immediately pass through the cation exchange resin to obtain an acidic activated orthosilicic acid solution.

[0058] Add 1M ammonia solution to the acidic activated orthosilicic acid solution to adjust its pH to 10. Take 250ml of alkaline activated orthosilicic acid solution as the base solution, use the constant liquid level method to control the liquid temperature to 70°C, and add acidic activated orthosilicic acid solution to it at a rate of 0.4ml / min, after 6 hours And after adding 150ml of acidic activated orthosilicic acid solution dropwise, light blue opalescence appeared in the bottom li...

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Abstract

The invention provides a method for modifying layered silicate powder by using silicon dioxide. The method comprises: preparing a dilute orthosilicic acid solution, an acidic activated orthosilicic acid solution, an alkaline orthosilicic acid solution, an active crystal seed sol, an active crystal seed / layered silicate suspension and an in-situ growing silica modified layered silicate, and drying the silica modified layered silicate suspension so as to finally obtain the silica modified layered silicate powder. According to the present invention, the silica particles can be simultaneously prepared on the surface and the edge of the layered silicate, such that the layered structure of the layered silicate can be peeled off, and the problem that the application temperature is affected by the poor heat resistance of the polymer intercalation molecules due to the in-situ intercalation or in-situ polymerization with long chain quaternary ammonium salts and other intercalators can be avoided.

Description

technical field [0001] The invention relates to a method for modifying layered silicate powder with silicon dioxide, which belongs to the technical field of chemical industry. Background technique [0002] Layered silicate minerals are widely distributed in nature and are the main minerals that constitute the crust and upper mantle. The basic structural units are silicon-oxygen tetrahedron and aluminum-oxygen octahedron. According to the different combinations of tetrahedron and octahedron in the layered silicate mineral crystal layer, it can be divided into 1:1 type layered clay and 2:1 type layered clay. Among them, the 1:1 layered clay mainly includes kaolinite, serpentine, etc.; the 2:1 layered clay mainly includes mica, vermiculite, montmorillonite, etc. Generally speaking, the average thickness of the sheet is about 1nm , the sheet size is 100-200nm. When minerals are formed, the isomorphic replacement of high-valent cations by low-valent cations will generate residu...

Claims

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Application Information

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IPC IPC(8): C09C1/42C09C3/06
CPCC09C1/42C09C3/06
Inventor 张剑吕毅李洪深赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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