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Aluminum oxide/polystyrolsulfon acid graft copolymer composite abrasive grain and preparation method thereof

A technology of polystyrene sulfonic acid and graft copolymer, which is applied in the direction of chemical instruments and methods, and other chemical processes, to achieve the effects of reducing roughness, improving polishing scratches and surface damage, and good dispersion stability

Inactive Publication Date: 2009-02-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to overcome the defects of the existing single abrasive and provide a composite abrasive grain of alumina / polystyrene sulfonic acid graft copolymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: the concrete steps of this embodiment are:

[0020] Modification: take 50g Al 2 o 3 Dried powder dispersed in ethanol, Al 2 o 3 The addition amount of the solution is 0.1g / mL ethanol, and 25g of coupling agent KH570 is added, and ultrasonically dispersed for 0.5 hours. The reaction was carried out at 110° C. for 5 hours. The product was suction filtered, washed and dried.

[0021] Polymerization: In a 1000mL single-necked flask equipped with a reflux condenser and magnetic stirring, add 8mL of 3% PVA aqueous solution, 492mL of distilled water and 50g of modified Al 2 o 3 , vacuum pumping and nitrogen filling were repeated four times, heated to 80°C, and then added 0.5g BPO and 5g styrene (both added at one time) to start polymerization, and kept at this temperature for 5h. The product was filtered with suction, washed twice, and dried under vacuum at 50°C for 12 hours.

[0022] Sulfonation: Install a stirrer, a thermometer and a drying tube on a ...

Embodiment 2

[0023] Embodiment 2: The steps of this embodiment are basically the same as those of the above-mentioned embodiment 1, except that the amounts of BPO and styrene monomers added in the polymerization step are 2.5 g and 25 g, respectively. Finally, the aluminum oxide composite abrasive grains of polystyrene sulfonic acid with a monomer / alumina relative dosage of 2:1 were obtained.

Embodiment 3

[0024] Embodiment 3: The steps of this embodiment are basically the same as those of the above-mentioned embodiment 1, except that the amounts of BPO and styrene monomers added in the polymerization step are 5 g and 50 g, respectively. Finally, the aluminum oxide composite abrasive grains of polystyrene sulfonic acid with monomer / alumina relative dosage of 1:1 were obtained.

[0025] The particle size range of the alumina / polystyrene sulfonic acid composite abrasive grains prepared above is 100-1000 nm, and the average particle size is 200-500 nm as measured by a laser particle size analyzer.

[0026] Now the application test of the aluminum oxide / polystyrene sulfonic acid composite abrasive that present embodiment makes is described below:

[0027] (1) First prepare the polishing solution: under mechanical stirring conditions, add 500 grams of alumina / polystyrene sulfonic acid composite abrasive grains to 20 liters of water for dispersion and dilution, then add 150 grams of p...

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Abstract

The invention relates to alumina / polystyrolsulfon acid graft copolymer composite abrasive grain and a preparation method thereof. The inner core of the composite abrasive grain is modified Alpha-Al2O3, and polystyrene coating is formed through graft copolymerization; finally, the alumina / polysuberamide graft copolymer composite abrasive grain is got through sulfonation reaction; the mass of a coupling agent in the modified Alpha-Al2O3 is 20 to 60 percent of the mass of the Alpha-Al2O3; the mass of the polysuberamide is 5 to 60 percent of the mass of the Alpha-Al2O3. The inner core of the alumina / polysuberamide manufactured is Alpha-Al2O3. As the polysuberamide polymer coating of the crust is not hard, the core / crust structure reduces the hard impact of the inorganic Alpha-Al2O3 abrasive grain inside polishing microzones on workpieces under the pressurized and accelerated polishing conditions, thus improving the polishing scratch and surface damage, improving the microscopic states of the polished surfaces and reducing the roughness. In addition, due to the high hydrophilicity of sulfonic groups in the crust, the composite grain has high water dispersibility; the polishing solution has high dispersion stability; and the grain cohesion is reduced.

Description

technical field [0001] The invention relates to an aluminum oxide / polystyrene sulfonic acid graft copolymer composite abrasive grain and a preparation method thereof, belonging to the technical field of preparation technology of abrasive materials for high-precision polishing. Background technique [0002] In recent years, with the rapid increase of memory hard disk capacity and storage density, the flying height of the computer head has been reduced to about 10nm. With the head running so close to the disk, the demands on the surface quality of the disk are getting higher and higher. If the surface roughness and waviness of the hard disk are too large, the head will collide with the surface of the disk during high-speed rotation, which will damage the head or the magnetic medium on the surface of the hard disk, resulting in failure of the disk device or failure of reading and writing information. mistake. Therefore, before forming a magnetic medium, the disk substrate mus...

Claims

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Application Information

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IPC IPC(8): C09K3/14C08F292/00C08F8/36
Inventor 雷红张泽芳布乃敬刘平褚凤灵
Owner SHANGHAI UNIV
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