Preparation method of composite shell expandable microspheres
By adding a silicon source acid solution during the suspension polymerization process, the silica is fixed on the surface of the microspheres to form a dense silica shell, the problem of difficult to stabilize the silica particles in the prior art is solved, and the higher heat resistance and filtration efficiency of the microspheres are improved.
CN119751926AActive Publication Date: 2025-04-04WANHUA CHEM GRP CO LTD
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Patent Information
- Application Number
- CN202510001671.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2045-01-02
AI Technical Summary
Technical Problem
In the existing methods for preparing expandable microspheres, silica particles are difficult to stabilize on the surface of the microspheres, resulting in difficulty in filtration, low washing efficiency and problems of plate bonding of microspheres after drying.
Method used
By adding a silicon-source acid solution during suspension polymerization, the silica is fixed on the surface of the microspheres to form a dense silica shell layer, thereby improving the heat resistance and filtration efficiency of the microspheres.
Benefits of technology
The microspheres are achieved with higher heat resistance, improved filtration and washing efficiency and improved raw material utilization, ensuring that the microspheres are easily dispersed into single particles after drying.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a preparation method of composite shell microspheres. The preparation method comprises the following steps: A) mixing a reaction monomer, an initiator and an organic solvent foaming agent to obtain an oil phase; b) mixing water, a dispersing agent and a co-stabilizer to prepare a water phase; c) adding the water phase into the oil phase, and stirring to obtain an emulsion; d) stirring and reacting at the reaction temperature for at least 2 hours, and then adding a silicon source acid solution to continuously react to obtain core-shell structure polymer microsphere slurry containing organic silicon; and E) filtering and drying to obtain thermal expansion microsphere powder. The expanded microspheres prepared by the preparation method provided by the invention have better heat resistance, and the method can improve the filtering and washing efficiency of the microspheres and improve the utilization rate of raw materials.
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