A kind of preparation method of hydrophobic modified diamond abrasive

A hydrophobic modification and diamond technology, which is applied in the field of powder surface modification, grinding and polishing, can solve problems that do not involve special treatment, and achieve the effects of less solvent consumption, large processing capacity and simple process

Active Publication Date: 2021-02-09
HENAN UNION ABRASIVES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN104610784A discloses a modified nano-diamond and its polishing liquid and polishing sheet, which also uses abrasives and silane coupling agents to react in the liquid phase to carry out surface modification, and does not involve pretreatment of abrasives and fine-grained abrasives. Special treatment to prevent their reunion

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  • A kind of preparation method of hydrophobic modified diamond abrasive

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Embodiment 1

[0021] The preparation method of the hydrophobically modified diamond abrasive of the present embodiment is as follows:

[0022] (1) Diamond powder treatment: 12500ct of 80nm single crystal diamond powder was treated with 8.4L of sulfuric acid, nitric acid and perchloric acid (ratio: 15:1.25:1) mixed acid, the treatment temperature was 180°C, and the reaction time was 12h; The diamond abrasive is collected by centrifugal sedimentation, and the collected diamond abrasive is washed with water three times. The pH value of the supernatant is 6. After the abrasive is collected by centrifugal sedimentation, the abrasive is freeze-dried and dried for later use.

[0023] (2) Preparation of silane coupling agent solution: This example uses silane coupling agent OFS-6341 (Dow Corning), hydrolysis of silane coupling agent: (isopropanol: H 2 O=9:1) The mass of the solution is 50%, and the mass of OFS-6341 accounts for 50%. Mix the two evenly. Adjust the pH value of the solution to 4.5 wit...

Embodiment 2

[0027] The preparation method of the hydrophobically modified diamond abrasive of the present embodiment is as follows:

[0028] (1) Diamond powder treatment: 12500ct of 1μm single crystal diamond powder was treated with 8.4L of sulfuric acid, nitric acid and perchloric acid (ratio: 15:1.25:1) mixed acid, the treatment temperature was 180°C, and the reaction time was 12h; The diamond abrasive is collected by centrifugal sedimentation, and the collected diamond abrasive is washed with water three times. The pH value of the supernatant is 6. After the abrasive is collected by centrifugal sedimentation, the abrasive is freeze-dried and dried for later use.

[0029] (2) Preparation of silane coupling agent solution: this embodiment adopts silane coupling agent KH550 (Dow Corning), hydrolysis of silane coupling agent: (ethanol: H 2 O=1:1) The mass of the solution accounts for 50%, and the mass of KH550 accounts for 50%. The liquid is stirred for 10 minutes to mix the two evenly, an...

Embodiment 3

[0033] The preparation method of the hydrophobically modified diamond abrasive of the present embodiment is as follows:

[0034](1) Diamond powder treatment: 12500ct of 4μm single crystal diamond powder was treated with 8.4L of sulfuric acid, nitric acid and perchloric acid (ratio: 15:1.25:1) mixed acid, the treatment temperature was 180°C, and the reaction time was 10h; The diamond abrasive was collected by natural sedimentation, and the collected diamond abrasive was washed 5 times with water. The pH value of the supernatant was 6. After the abrasive was collected by natural sedimentation, it was dried in an oven at 110°C for 8 hours to dry the abrasive for use.

[0035] (2) Preparation of silane coupling agent solution: This example uses silane coupling agent OFS-6341 (Dow Corning), hydrolysis of silane coupling agent: (isopropanol: H 2 O=9:1) The mass of the solution accounts for 50%, and the mass of OFS-6341 accounts for 50%. The two are mixed evenly, and the pH value of ...

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Abstract

The invention discloses a preparation method of a hydrophobic modified diamond abrasive. The method comprises the following steps: carrying out mixed acid treatment on a diamond raw material by sulfuric acid, nitric acid and perchloric acid according to a certain ratio, so that the surface of the diamond raw material has more -COOH groups; washing a diamond grinding material with water until the pH value of the supernatant is 5-7 by adopting a natural sedimentation or centrifugation method, and drying to obtain an agglomeration-free loose diamond grinding material; adding diamond powder to betreated into a high-speed mixer, spraying a hydrolyzed silane coupling agent, reacting carboxyl on the surface of diamond with the silane coupling agent at 80 DEG C for 3-5 minutes, and drying residual moisture to obtain the hydrophobic diamond powder. According to the preparation method, the mixed acid treatment is adopted so that the surface of the diamond is provided with more -COOH groups, andthe reaction capacity of the surface of the diamond and the silane coupling agent is improved; the method has the advantages of large single treatment capacity, short reaction time, simple operationprocess, low solvent consumption, energy saving and environmental protection.

Description

technical field [0001] The method belongs to the field of powder surface modification, and the properties of the diamond surface are changed through the reaction of active groups on the diamond surface with chemical reagents, and the product is mainly used in the field of grinding and polishing. Background technique [0002] In non-metallic ore processing or non-metallic mineral materials, mineral powders with a particle size of 0.1 μm-10 μm are generally called ultrafine ore powders or ultrafine powder mineral materials. Powder surface modification refers to the use of physical, chemical, mechanical and other methods to treat the surface of mineral powder, and to change the physical and chemical properties of the powder surface purposefully or to give it new functions according to the application needs. Due to its fine particle size and large specific surface area, ultra-fine diamond powder has many atoms in the incomplete crystal form and many dangling bonds on the surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14
CPCC09K3/1409
Inventor 付存刘丹丹王森郭贝贝汪静
Owner HENAN UNION ABRASIVES
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