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Method for bleaching pearls with sodium percarbonate and bleaching device

A technology of sodium percarbonate and pearls, applied in the field of jewelry handicrafts, can solve the problems of reducing the bleaching effect, corrosion, and the concentration of sodium percarbonate, etc., and achieve the effect of improving the bleaching effect, simple solution formula, and simple operation steps

Active Publication Date: 2020-12-04
海南京润珍珠科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in the hydrogen peroxide bleaching process: hydrogen ions are released during the hydrogen peroxide oxidation process, which reduces the pH value of the solution, corrodes pearls with calcium carbonate as the main component, and deteriorates the quality of pearls, such as decreased gloss and brittle nacre.
[0005] However, sodium percarbonate is unstable when dissolved in water, and it is easy to decompose, releasing oxygen and reducing the bleaching effect
However, it takes a long time for the bleaching solution to penetrate into the nacre, and the sodium percarbonate has been decomposed before the bleaching solution fully penetrates the nacre, and the concentration of sodium percarbonate is greatly reduced, which seriously affects the bleaching ability of the bleaching solution.

Method used

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  • Method for bleaching pearls with sodium percarbonate and bleaching device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 (control group 1)

[0036] 1. Take 100.00kg of seawater pearl grains (particle size greater than 7mm), and drill holes according to conventional jewelry pearls. Take 100.00kg of clean water at 0-4 degrees Celsius, put it into a 200-liter bleaching tank, start the ice water machine to automatically cool to 0-4 degrees Celsius, then add 3.0kg of sodium percarbonate, stir to dissolve completely, and then put in 100.00kg of already beaten Hole pearl grains, cover the bleach container lid, do not pressurize. After bleaching until the third day, turn off the ice water machine, deflate, and open the cover. Take out the pearls and soak them in clean water for 3-5 times, once a day. Then let it dry and that's it.

[0037] Effectiveness test: 1. Bleached pearls are tested according to the method stipulated in the national standard GB / T18781-2008. The gloss level of seawater pearls reaches grade A up to 1.00kg, and grade B reaches 26.00kg. There are 73.00kg of pear...

Embodiment 2

[0043] Embodiment 2 (control group 2)

[0044] 1. Take 100.00kg of low-grade seawater pearls (particle size greater than 7mm), and drill holes according to conventional jewelry pearls. Take 100.00kg of hydrogen peroxide solution (concentration 0.3%) and put it into a 200-liter bleaching tank, start the ice water machine to automatically cool to 0-4 degrees Celsius, then put 100.00kg of perforated pearls, cover the bleaching container cover, and start the emptying tank. The press is automatically pressurized to 1MPa. After bleaching until the third day, stop the chiller and air compressor, release the air through the pressure reducing valve, and open the cover. Take out the pearls and soak them in clean water for 3-5 times, once a day. Then let dry and that's it.

[0045]Effectiveness test: 1. Bleached pearls are tested according to the method stipulated in the national standard GB / T18781-2008. The luster level of seawater pearls reaches A grade up to 0.00kg, reaches B grade...

Embodiment 3

[0052] 1. Take 100.00kg of seawater pearl grains (particle size greater than 7mm), and drill holes according to conventional jewelry pearls. Take 100.00kg of clean water at 0-4 degrees Celsius, put it into a 200-liter bleach tank, start the ice water machine to automatically cool to 0-4 degrees Celsius, then add 3.00kg of sodium percarbonate, stir to dissolve completely, and then put 100.00kg of already Perforated pearls, covered with bleach container lid, airtight. Start the air compressor to automatically pressurize to 1MPa. After bleaching until the third day, stop the chiller and air compressor, deflate, and open the cover. Take out the pearls and soak them in clean water for 3-5 times, once a day. Then let it dry and that's it.

[0053] Effectiveness test: 1. Bleached pearls are tested according to the method stipulated in the national standard GB / T18781-2008. The luster level of seawater pearls reaches grade A up to 33.00kg, and grade B reaches 40.00kg, and 27.00kg ne...

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Abstract

The invention discloses a method for bleaching pearls with sodium percarbonate and a bleaching device, and belongs to the field of ornament artware. The method comprises the following steps: dissolving sodium percarbonate solid powder in clean water to obtain a sodium percarbonate solution; putting the sodium percarbonate solution and the punched pearl grains into a bleaching tank in the bleachingdevice, and controlling the temperature in the bleaching tank to be 0-8 DEG C; sealing the bleaching tank, and controlling the pressure in the bleaching tank to be 0.2-10MPa; after the pearl grains are bleached for 2-8 days, taking out the pearls, continuously soaking the pearls with clean water for 3-5 times, and airing the pearls once a day to obtain bleached pearls. The method is used in combination with the bleaching device, the bleaching effect of hydrogen peroxide is achieved, a pearl layer can be kept stable and not damaged by a bleaching agent, meanwhile, under a certain temperature condition, the decomposition speed and bleaching speed of the bleaching agent sodium percarbonate can be controlled through a pressure control method, the sodium percarbonate dissolved in water is keptstable, the bleaching effect of the nacreous layer is improved, and bleaching is facilitated.

Description

technical field [0001] The invention belongs to the field of ornaments and handicrafts, and relates to a method for bleaching pearls, in particular to a method for bleaching pearls with sodium percarbonate and a bleaching device. Background technique [0002] Pearls are pearl oysters that secrete nacre, which wraps foreign matter layer by layer, forming pearls over time. The main component of pearls is calcium carbonate, which accounts for about 90% of pearl components. The light transmission and refraction effect of the nacre affects the gloss of the pearl. There are many stains and other organic impurities between the nacre, which affect the luster and appearance of the pearl. Harvested pearls generally cannot be directly used to make jewelry, because most of the pearls have color differences, stains, irregular shapes, etc. Pearls are processed by oxidant bleaching, which can oxidize the organic matter that causes the difference in pearl color into colorless substances, ...

Claims

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Application Information

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IPC IPC(8): A44C27/00
CPCA44C27/00Y02A40/81
Inventor 周泉王海林志成周政
Owner 海南京润珍珠科技有限公司
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