Improved activated calcium bentonite

By preparing modified layered silicates with cation exchange capacities ranging from 70 to 130 meq/100g, the problems of swelling behavior and exfoliation difficulty of bentonite were solved, achieving the effect of reducing the organic component requirement and improving the thickening performance in hydraulic adhesives.

CN121605083APending Publication Date: 2026-03-03BYK CHEMIE GMBH
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Patent Information

Application Number
CN202480050685.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-08-03
Filing Date
2024-07-16
Publication Date
2026-03-03

AI Technical Summary

Technical Problem

Existing bentonite has poor performance in terms of swelling behavior and ease of exfoliation, and requires additional organic components to provide additional properties when used in combination with hydraulic binders, and the organic components prolong the setting time of the formulation.

Method used

A layered silicate with a cation exchange capacity in the range of 70-130 meq/100g was prepared by mixing natural calcium-based bentonite with a sodium salt compound in the presence of water, carrying out an ion exchange reaction and drying to form a modified layered silicate for use as a rheology modifier in aqueous compositions.

Benefits of technology

It improves the swelling behavior and exfoliation properties of bentonite, reduces the need for organic additives, enhances the thickening properties of water-containing compositions, and exhibits excellent anti-sagging properties in hydraulic adhesives.

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Abstract

The present invention relates to a layered silicate having a cation exchange capacity in the range of 70-130 meq / 100 g, having leachable sodium cations in the range of 65-130 meq / 100 g, having leachable magnesium cations in the range of 5-65 meq / 100 g, having leachable calcium cations in the range of 15-95 meq / 100 g, and having a cation exchange capacity in the range of 70-130 meq / 100 g, having leachable sodium cations in the range of 65-130 meq / 100 g, having leachable magnesium cations in the range of 5-65 meq / 100 g, having leachable calcium cations in the range of 15-95 meq / 100 g, and wherein the sum of the leachable sodium, magnesium and calcium cations is at least equal to the cation exchange capacity, and wherein an aqueous suspension containing 5% by weight of the layered silicate has a rotary viscosity at 10 rpm of 30 mPas or higher measured at a temperature of 23 DEG C.
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