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Emulsion polymerizing modification method for surface of nano ceramic powder

A technology of nano-ceramic powder and emulsion polymerization, applied in ceramic forming machines, chemical/physical/physicochemical processes of energy application, manufacturing tools, etc.

Inactive Publication Date: 2004-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the preparation of a stable ceramic powder emulsion system with good dispersibility, surface polymerization modification, and direct centrifugal molding to obtain a ceramic green body with uniform particle dispersion.

Method used

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  • Emulsion polymerizing modification method for surface of nano ceramic powder
  • Emulsion polymerizing modification method for surface of nano ceramic powder
  • Emulsion polymerizing modification method for surface of nano ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] In a high-speed (2600 rpm) mixer, the nano-ceramic powder ZrO 2 (d 50 110nm) and Al 2 o 3 (d 50 120nm) powder surface pre-coated coupling agent silane KH570. Then, the nano-ceramic powder pretreated by the coupling agent, the emulsifier sodium dodecyl sulfate SDS and the dispersant water system form a stable emulsion system under the action of ultrasonic waves, so that the hydrophobic ceramic powder absorbs the emulsifier, form latex particles. It has similar properties to seed latex particles in seed emulsion polymerization, and can initiate polymerization to occur on the surface of ceramic powder, reducing the formation of separate polymer particles. Then add the organic monomer methyl methacrylate MMA or styrene ST, continue ultrasonic dispersion, and then slowly add the initiator (NH 4 ) 2 S 2 o 8 . The temperature is raised to a temperature at which the initiator can form free radicals until the reaction is complete.

[0016] In table 1 below, 5 examples...

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Abstract

The polymerization modification method of nano ceramic powder body surface emulsion includes the following steps: adopting high-speed mix-stirring method to precoat the ceramic powder body surface with coupling agent capable of making ceramic powder body surface have hydrophobic property; under the action of ultrasonic wave making the nano ceramic powder body pretreated with coupling agent, emulsifier and water form stable emulsion system; adding 0.5-5 portions of organic monomer in 5-30 portions of nano ceramic powder body, continuously ultrasonic dispersing, at the same time slowly drop-adding initiator, heating to the temp. (70-80 deg.C) which can form free radial until the reaction is completed. Said invented ceramic powder body emulsion system can be directly flospinned to obtain ceramic biscuit in which the particles are uniformly dispersed.

Description

technical field [0001] A method for modifying the surface of nano ceramic powder by emulsion polymerization belongs to the technical field of ceramic powder preparation and molding. Background technique [0002] When applying ceramic powder centrifugal molding or injection molding, nano-ceramic powder is easy to form agglomeration due to its large specific surface energy. The formed soft agglomerates will be opened under a certain pressure, while the hard agglomerates will always be retained, which directly affects the molding of the green body, the sintering behavior of the material and the microstructure, which is not conducive to the realization of low-temperature sintering and grain size of ceramics. refinement. To avoid the formation of hard agglomerates, the first is to improve the preparation method of the powder, and the second is to directly combine the powder preparation and molding, omitting the drying process of wet powder making (Gao Lian, etc., Nano Ceramics, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/10B28B1/00C04B35/622C04B41/80
Inventor 颜鲁婷司文捷苗赫濯
Owner TSINGHUA UNIV