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A kind of sol-gel polishing pill added with water-resistant coating soluble filler and preparation method thereof

A coating, water-soluble resin technology, applied in the field of sol-gel polishing pellets and their preparation, can solve the problems of difficult to guarantee the surface shape, decreased strength, low rubber hardness, etc., to enhance adsorption potential energy, reduce internal defects, absorb powerful effect

Active Publication Date: 2020-08-04
苏州威孚材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional abrasive manufacturing method is powder mixing→sieving→drying→pressing→sintering, which is prone to the problem of phase agglomeration. How to reduce the internal defects of abrasive grains and ensure the uniformity of the abrasive structure is an urgent problem to be solved. problem, because the uniformity of the internal structure directly affects the polishing performance
At the same time, traditional abrasive tools have the problem of passivation after long-term use. Therefore, it is necessary to design polishing pellets with the function of self-sharpening
[0004] The invention patent with the publication number 106944939B discloses a self-sharpening ultra-hard micro-abrasive pellet with soluble resin material and its preparation method. The "soluble" resin material on the surface of the abrasive is dissolved by the grinding liquid to form pores between the binders. , to reduce the strength of the binder and its holding force on the surrounding abrasive particles, so as to achieve the purpose of automatic on-line controllable sharpening of the abrasive tool, but this method is easy to dissolve the resin inside the pellet, resulting in a decrease in strength; the publication number is The invention patent of 106956222B discloses a porous sponge composite diamond abrasive pellet using a rubber binder and its preparation method. The rubber elastic composite compound containing continuous pores is combined with the composite particles into a pellet with spongy fine continuous pores. , due to the low hardness of rubber, it is difficult to guarantee the surface shape; the invention patent with the publication number of 104944956A discloses a method for preparing polycrystalline nano-diamond abrasive tools based on gelation reaction. This method uses polyacrylonitrile for gelation, and has high hardness. In the grinding stage; the invention patent with the publication number of 108081159A discloses a polyvinyl acetal resin mill with an organic gel forming method. This gel method cannot be applied to the water-based system. At the same time, a single resin cannot be carbonized to form capillary pores

Method used

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  • A kind of sol-gel polishing pill added with water-resistant coating soluble filler and preparation method thereof
  • A kind of sol-gel polishing pill added with water-resistant coating soluble filler and preparation method thereof
  • A kind of sol-gel polishing pill added with water-resistant coating soluble filler and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Prepare aluminum nitride powder with a water-resistant film on the surface

[0033] By weight, mix 100g of aluminum nitride powder with a particle size of 1 micron and 1kg of absolute ethanol, stir evenly, and heat up to 40°C in a water bath to obtain an ethanol dispersion of aluminum nitride; at the same time, dilute 600g of absolute ethanol Add 80g of tetraethyl orthosilicate (TEOS), and 100g of ammonia water diluted with 600g of absolute ethanol and 100g of water dropwise into the aluminum nitride ethanol dispersion at a rate of 2 drops / second. After reacting for 6 hours, stop the reaction, vacuum filter, wash the product 3 times with absolute ethanol, then place the obtained product at room temperature for 12 hours, and then place it at 300°C for calcination for 2 hours, after cooling , through a 200-mesh sieve, the aluminum nitride powder coated with silicon dioxide is obtained; , because the silicon dioxide has water resistance, the aluminum nitride powder...

Embodiment 2

[0037] Germanium flat lens polishing process:

[0038] The schematic diagram of the polishing method is as follows: image 3 As shown, a germanium plane lens with a diameter of 100 mm is pasted on the ceramic substrate with wax, and the plane lens is first ground with a 10 micron diamond polishing liquid and a silicon carbide grinding disc until the surface roughness reaches 25 nm. The obtained pellets are pasted on the cast iron plate, the diameter of the cast iron plate is 200 mm, the surface of the pellets is smoothed on a surface grinder, and the vertical error is less than 2 microns, the cast iron plate is placed on the base plate of the plane polishing machine, and the ceramic base plate is clamped with a clamp. The speed of the polishing disc is 100rpm, the clamp is pneumatically pressurized, and the pressure is 5Mpa. During the polishing process, an acidic polishing solution is added to the surface of the pellets. The pH value is 5, and the flow rate is 100ml / min. 5, ...

Embodiment 3

[0040] Operation is basically the same as in Example 1, except that in step 2, the amount of aluminum nitride powder coated with silicon dioxide is increased to 150g, and after sintering, the strength of the pellet substrate can still be maintained under dry conditions, and the stretching The strength reached 25Mpa, the flexural strength was 60Mpa, and the elongation at break was 145%. After soaking in water for 1 hour, the tensile strength was 23Mpa, and the flexural strength was 55Mpa. After drying, weigh the weight and the weight dropped by 0.5g ; After 2 hours, the tensile strength was 22Mpa, the flexural strength was 53Mpa, and the strength drop was not obvious. After drying, the weight was weighed, and the weight dropped by 0.4g.

[0041] After rubbing the surface of the pills, weigh the original weight of the pills, soak in water for 1 hour, the overall tensile strength of the pills is 23Mpa, and the flexural strength is 55Mpa. After drying, weigh the weight, and the wei...

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Abstract

The invention discloses a self-finishing polishing pellet sheet with a water-resistant coating soluble filler and a preparation method thereof. The preparation method comprises the following steps ofmixing the water-resistant aluminum nitride powder with the diamond micropowder, the electrolytic copper powder, the filler and the additive, and adding the mixed glue prepared from polyvinyl alcohol,water, ethanol and water-soluble resin to obtain the slurry. The grinding tool prepared from the polyvinyl alcohol and the phenolic aldehyde mixed resin liquid gel utilizes the physical gel capability of polyvinyl alcohol, forming a gel biscuit, the gel biscuit is formed, the polyvinyl alcohol is sintered and carbonized at high temperature, the water-soluble resin is solidified to be used as a polishing pellet sheet binding agent, a large amount of capillary through micropores are generated after the polyvinyl alcohol is carbonized, so that the water absorption capacity is strong; the aluminum nitride particle water-resistant coating with the water-resistant coating is added, after the aluminum nitride particle water-resistant coating is ground, the aluminum nitride is hydrolyzed, the strength is reduced, and the surface layer self-sharpening effect is achieved, the aluminum nitride water-resistant coating in the pellet sheet is protected, so that the overall strength of the pellet sheet is ensured.

Description

technical field [0001] The invention belongs to the field of precision machining grinding and polishing, and relates to a sol-gel polishing pellet added with a water-resistant coating soluble filler and a preparation method thereof. Background technique [0002] In optical processing, generally in high-speed fine grinding, after one fine grinding and two ultra-fine grinding, although it has a certain smooth and regular surface shape, it is not completely transparent and the surface shape is not required. It is necessary to polish the components to achieve the required surface finish. At this time, it is necessary to use a polishing sheet for high-speed fine grinding. Polishing is a main process after fine grinding. Therefore, the purpose of polishing is: (1) to remove the damaged layer of fine grinding to meet the specified appearance limit requirements; (2) to refine the surface shape, to reach the specified curvature radius R value of the drawing, and to meet the requireme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D18/00
CPCB24D18/009
Inventor 冯凯萍欧进乾周兆忠赵天晨许庆华
Owner 苏州威孚材料有限公司
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