Special dispersant for hydraulic overflow classification for high-purity superfine silicon carbide micro powder for linear cutting and using method

A silicon carbide micropowder and wire cutting technology, which is applied in the field of high-purity ultrafine silicon carbide micropowder hydraulic overflow grading special dispersant, can solve the problems that it is difficult to meet the needs of the wire cutting industry, silicon carbide particles cannot be dispersed, and the product particle size distribution is wide. Achieve the effect of worsening rheology, low cost, and optimizing rheological properties

Inactive Publication Date: 2011-04-13
LINSHUSNTIAN ABRASIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, dispersants composed of sodium tripolyphosphate, sodium pyrophosphate, water glass and other raw materials are used. These dispersants cannot effectively disperse silicon carbide particles, and the classification cycle is lo

Method used

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  • Special dispersant for hydraulic overflow classification for high-purity superfine silicon carbide micro powder for linear cutting and using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Prepare the special dispersant for high-purity ultrafine silicon carbide micropowder hydraulic overflow classification of wire cutting according to the following steps

[0057] a. Preparation of Tetramethylammonium Hydroxide 25% aqueous solution

[0058] Dissolve 5 kilograms of industrial product tetramethylammonium hydroxide in an appropriate amount of pure water, and dilute to a concentration of 25% by weight to obtain 20 kilograms of tetramethylammonium hydroxide 25% aqueous solution, or directly purchase a concentration of 25 percent from the market. % tetramethylammonium hydroxide solution, standby;

[0059] b. Preparation of the remaining component aqueous solution

[0060] According to the formula, put 55 kg of pure water, 10 kg of ethanolamine, 6 kg of EDTA, 10 kg of fatty alcohol polyoxyethylene ether O-25, 2 kg of alkylphenol polyoxyethylene ether, and 2 kg of Kason into the mixing tank, stir and dissolve at room temperature 30-60 minutes, spare;

[0061]c....

Embodiment 2～ Embodiment 6

[0064] According to the method and steps of Example 1, according to the ingredients in Table 1, the high-purity ultrafine silicon carbide micropowder hydraulic overflow classification special dispersant for wire cutting of the present invention is prepared

[0065] Table 1

[0066] raw material

[0067] 5-Chloro-2-methyl-4-isothiazolin-3-one

Embodiment 7

[0069] The dispersants prepared in Examples 1 to 6 are compared with dispersants such as sodium pyrophosphate, sodium tripolyphosphate, and water glass in the laboratory, and the test method is configured according to a concentration of 30% in a graduated beaker A good silicon carbide micropowder aqueous solution, then add the same amount of dispersant to the system, and stir well, observe the following phenomenon:

[0070]

[0071] Settling time refers to the time required for the same material to settle to a certain scale in a graduated beaker.

[0072] Turbidity refers to the same concentration of material settling time, the contrast of turbidity of the system and the contrast of material settling distance.

[0073] The hardness of the material after precipitation refers to the hardness of the settled material after the material has settled.

[0074] When measuring the viscosity, use a viscometer to measure the viscosity of the system at a constant temperature of 25°C. ...

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Abstract

The invention relates to a special dispersant for hydraulic overflow classification for high-purity superfine silicon carbide micro powder for linear cutting and a using method, and belongs to the preparation of high-purity silicon carbide micro powder. The special dispersant is prepared from the following raw materials in percentage by mass: 50 to 70 percent of pure water, 25 percent of tetramethylammonium hydroxide, 15 to 35 percent of aqueous solution, 5 to 20 percent of alkyl alcohol amine, 2 to 10 percent of ethylene diamine tetraacetic acid (EDTA), 0.1 to 2.0 percent of fatty alcohol-polyoxyethylene ether, 0.5 to 3.0 percent of alkylpheol ethoxylate and 0.1 to 3.0 percent of bacteriostatic agent. The invention provides the special dispersant for the hydraulic overflow classification for the high-purity superfine silicon carbide micro powder for the linear cutting and a preparation method and the using method thereof, wherein the special dispersant has the advantages of short hydraulic overflow classification period in the production process of the high-purity superfine silicon carbide micro powder for the linear cutting, high yield, uniform product granularity distribution, difficult agglomeration of granules and capability of meeting the requirement of the linear cutting industry. The special dispersant can remarkably improve the potential of the high-purity superfine silicon carbide micro powder for the linear cutting and reduce the viscosity of slurry so as to remarkably optimize the rheological property of the slurry.

Description

technical field [0001] The invention is a high-purity ultrafine silicon carbide micropowder hydraulic overflow grading special dispersant for wire cutting and its preparation and use method. It belongs to the preparation of silicon carbide high-purity micropowder. Background technique [0002] The hardness of silicon carbide is second only to natural diamond and a kind of black corundum. Silicon carbide particles in a certain particle size range are high-quality grinding materials. The high-purity ultra-fine silicon carbide powder used as wire cutting has a particle size of several microns to 20 microns, and has strict requirements on the accuracy and consistency of particle size classification, and the particle surface energy is relatively large. In the preparation process, hydraulic overflow classification is adopted. In the hydraulic overflow classification process, the dispersion performance of the dispersant has a great influence on the length of the classification cy...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 周强龚志刚
Owner LINSHUSNTIAN ABRASIVE
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