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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AI-Extracted 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 ...

Method used

From above-mentioned matched group and embodiment result of the present invention obviously find out: relative to adopting hydrogen peroxide bleaching agent or adopting the situation of sodium percarbonate solution but not applying pressure, the present invention adopts sodium percarbonate bleaching agent in conjunction with control temperature and applies ...

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.

Application Domain

Climate change adaptationJewellery

Technology Topic

Sodium acid carbonateSodium percarbonate +6

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Examples

Experimental program(6)

Example Embodiment

[0035] Example 1 (Control Group 1)

[0036] 1. Put 100.00kg of seawater pearl particles (greater particle size is greater than 7mm), punch in conventional jewelry pearls. Take 100.00kg, 0 ~ 4 degrees Celsius clean water, put into 200 liter drift white cans, start the ice water machine automatically cool to 0 ~ 4 degrees Celsius, then add 3.0 kg of sodium carbonate, stir dissolve complete, then put it in 100.00kg has already played The pearl particles of the holes are covered with bleached container cover, and no pressurization. Bleaching to day 3, shut down the ice water machine, ventilate, and open the cover. Take the pearl with clean water for 3 to 5 times, once a day. Then dry it, you can.

[0037] Entry test: 1, bleaching pearl according to the method specified in the national standard GB / T18781-2008, the seawater pearl glossy level reached 1.00kg, reaching the B-class 26.00kg, there is a need to continue bleaching 73.00kg, no ideal bleach effect .

[0038] 2, 100 ml of bleaching liquid from the bleaching can 1 during the bleaching process, according to the "active oxygen detection method" specified by the Ministry of Health Industry Standard WS / T646-2019 Appendix A, the test results are shown in Table 1 below .

[0039] Table 1

[0040] Bleaching time (hours) 24 48 72 Active oxygen content g / 100g 0.06 0.05 0.01

[0041] The active oxygen content detection of Table 1 shows that under non-pressurization conditions, the bleach decomposition is relatively fast, and there is little bleaching ability after 24 hours, and the bleaching effect is not good.

[0042] Select 10 bleached sea water pearls; polish the pearl grains by one, and use the scanning electron mirror to observe the pearl section. The detection result, observed cross section, showing the outer layer of pearls and proximity to the pearl layer by bleaching, the bleaching area is about 10 ~ 20%, and the remaining parts are bleached.

Example Embodiment

[0043] Example 2 (Control Group 2)

[0044] 1. Take a low grade seawater pearl particles 100.00kg (greater particle size greater than 7mm), punch the pearl in conventional jewelry. Take 100.00kg of the oxygen solution (concentration 0.3%) into 200 liter float white can, activate the ice water machine automatically cool to 0 to 4 degrees Celsius, then add 100.00kg of pearl grains that have been punched, cover the bleached container cover, start the air The press is automatically pressurized to 1 MPa. Bleaching to day 3, stop the ice water machine, the air compressor, and open the air through the decompression valve. Take the pearl with clean water for 3 to 5 times, once a day. Then dry it, you can.

[0045]The effectiveness of detection: 1, pearl bleaching method specified by GB GB / T18781-2008 detection, seawater pearl luster level Class A up there 0.00kg, reach grade B 0.00kg, produce waste beads have 100.00kg, pearl serious damage, does not meet the ideal bleaching effect.

[0046] 2, every 24 hours during the bleaching extraction 100ml hydrogen peroxide bleaching solution from the bleaching vessel "active oxygen detection method" specified by the People's Republic of China Health Industry Standard WS / T646-2019 Appendix A testing, test results shown in Table 1 below .

[0047] Table 2

[0048] Bleaching time (hours) 24 48 72 Active oxygen content g / 100g 0.29 0.28 0.27

[0049] The active oxygen content detected in Table 2 indicate that hydrogen peroxide under pressurized conditions 1MPa, bleach decomposition is relatively slow.

[0050] Select 10 bleach water pearls; pearls select one by one smooth polished cross-section, the grinding process, 10 pearl brittle, brittle fracture occurs, one by one was observed by sectional SEM pearl polished. Detection result, the section was observed pearl gloss serious decline, severe corrosion pearly layer.

Example Embodiment

[0051] Example 3

[0052] 1. Put 100.00kg of seawater pearl particles (greater particle size is greater than 7mm), punch in conventional jewelry pearls. Take 100.00kg, 0 to 4 degrees Celsius clean water into the bleaching tank 200 liters, automatically start the ice-water was cooled to 0 to 4 ° C, followed by addition of 3.00kg of sodium percarbonate, stirred to dissolve completely, then placed 100.00kg has perforated pearls, bleaching covered container lids sealed. Automatically start the air compressor pressure to 1MPa. Day 3 bleach to stop the ice machine, air compressor, bleed, opening the lid. Take the pearl with clean water for 3 to 5 times, once a day. Then dry it, you can.

[0053] The effectiveness of detection: 1, pearl bleaching method specified by GB GB / T18781-2008 detection, seawater pearl luster level Class A up there 33.00kg, reach grade B 40.00kg, need to continue to have bleached 27.00kg, to achieve good results. For difficult bleached blue beads, it can also be completely bleached.

[0054] 2, select 10 bleach water pearls; high-grade water pearls 10 select the market. The pearls individually selected smooth polished cross-section, one by one pearl sectional observation by SEM. Detection result, embodiments of the invention without any signs of corrosion inside bleaching pearls 3, selected on the market have a cross-sectional layer of the pearl slight signs of corrosion.

[0055] 3, every 24 hours during the bleaching 100ml bleaching solution extracted (sodium percarbonate solution) from the bleaching vessel predetermined by People's Republic of China Health Industry Standard WS / T646-2019 Appendix A "method for detecting active oxygen" detection, the detection result table 3 below.

[0056] table 3

[0057] Bleaching time (hours) 24 48 72 Active oxygen content g / 100g 0.24 0.12 0.07

[0058] Table 3 Detection of active oxygen content shows that sodium percarbonate solution is applied under conditions 1MPa, bleach decomposition than in the case without application of pressure or application of pressure hydrogen peroxide decomposition rate is slow, pearl has improved bleaching power, the active oxygen content within 48 hours than in Example 1 without applying high pressure embodiment about 100%.

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Method for bleaching pearls with sodium percarbonate and bleaching device

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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