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A quaternized spherical α-alumina@γ-alumina composite abrasive grain and its preparation method

A technology of composite abrasive grains and alumina, which is applied in chemical instruments and methods, dyed organic silicon compound treatment, dyed low-molecular organic compound treatment, etc., can solve the problem that the polishing rate and polishing precision of alumina abrasive grains cannot be achieved at the same time

Active Publication Date: 2021-11-05
上海胶束化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing alumina abrasive grain polishing rate and polishing precision cannot be achieved at the same time, and to provide a quaternized spherical α-alumina@γ- Aluminum Oxide Composite Abrasive Grains

Method used

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  • A quaternized spherical α-alumina@γ-alumina composite abrasive grain and its preparation method

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Experimental program
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Embodiment 1

[0035] This example provides a method for preparing a quaternized spherical α-alumina@γ-alumina composite abrasive polishing solution, which is prepared through surface quaternization modification, surface adsorption between particles, etc. The method steps are as follows :

[0036] S01: In a three-necked flask with a reflux device, add 1000 grams of toluene solvent, under stirring, add 50 grams of spherical α-alumina powder with a particle size of 0.5 microns, stir well and continue stirring, add dropwise 100 grams of γ-chlorine Propyltrimethoxysilane coupling agent, heated to 90-100°C, reacted for 2-4 hours, centrifuged, the precipitate was washed twice with benzene and acetone in turn, filtered with suction, and the precipitate was vacuum-dried at room temperature to obtain Spherical α-alumina silane coupling agent modified product with propyl group terminal.

[0037] S02: In a three-necked flask with a reflux device, add 1000 grams of acetonitrile solvent, add the above s...

Embodiment 2

[0043] Same as Example 1, except that the spherical α-alumina used in step S01 is spherical α-alumina with a particle size of 2 microns, and the coupling agent is 3-(2.3-glycidyloxy)propyltrimethoxysilane; The tertiary amine organic matter in S02 is C18 alkyl dimethyl tertiary amine; the γ-alumina in step S04 is γ-alumina powder with a particle size of 1 micron.

Embodiment 3

[0045] Same as Example 1, except that the spherical α-alumina used in step S01 is spherical α-alumina with a particle size of 1 micron; the tertiary amine organic matter in step S02 is C12 alkyl dimethyl tertiary amine; The aluminum is γ-alumina powder with a particle size of 0.5 microns; the mixing ratio of the γ-alumina dispersion to the spherical α-alumina dispersion in step S05 is γ-alumina:spherical α-alumina (weight ratio) = 1: 2.

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Abstract

The invention discloses a method for preparing quaternized spherical α-alumina@γ-alumina composite abrasive grains. Firstly, the spherical α-alumina is modified by using a silane coupling agent containing terminal functional groups, and further combined with tertiary The amine reaction produces spherical α-alumina quaternization products, which are positively charged; finally, electrostatic attraction and hydrogen bond force are used to make negatively charged γ-alumina particles with irregular shapes in the spherical α-alumina Adsorption occurs on the surface of the quaternized product, and the core-shell quaternized spherical α-alumina@γ-alumina composite abrasive grains are obtained. The composite abrasive grains are used to polish the ceramic cover plate of the mobile phone. Compared with the α-alumina abrasive grains of the conventional irregular shape, the abrasive grains of the present invention can effectively prevent the occurrence of polishing damage and polishing defects; Compared with the polishing rate of the quaternized spherical α-alumina@γ-alumina composite abrasive grains of the present invention, the polishing rate is increased by more than 50%, and the abrasive grains of the present invention exhibit excellent "high speed and high precision" on the ceramic cover plate of the mobile phone Polishing properties.

Description

technical field [0001] The invention relates to an alumina composite abrasive grain for polishing a mobile phone ceramic cover plate and a preparation method thereof, in particular to a quaternized spherical α-alumina@γ-alumina composite abrasive grain and a preparation method thereof, belonging to surface polishing technology field. Background technique [0002] With the application of wireless charging and the arrival of 5G communication technology, ceramics have excellent characteristics such as high hardness (twice that of glass), scratch resistance and wear resistance, strong electromagnetic signal penetration, and beautiful appearance, making them ideal for next-generation smartphones The rear cover material has a huge market and broad application prospects. At present, it has been applied on high-end models of Xiaomi, Android, Huawei P7, Apple Apple Watch and other brands. An ultra-smooth and flat ceramic surface is not only a need to beautify the product and obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14C09C1/40C09C3/12C09C3/08C09G1/02
CPCC01P2004/32C09C1/407C09C3/08C09C3/12C09G1/02C09K3/1436
Inventor 雷逸凡雷红杨小强张会龙陈巍巍
Owner 上海胶束化工有限公司