An immersion solution for enhancing the luster of freshwater pearls and a pearl processing method

Abstract

The present invention discloses a soaking solution for enhancing the luster of freshwater pearls and a pearl processing method, comprising the following steps: S1 pre-treatment, S2 preparing the pearl soaking solution, S3 soaking the original pearls, and S4 washing with water and air-drying naturally after soaking. The freshwater pearl processing method provided by the present invention is to soak the pearls successively with four different soaking solutions to obtain pearls with significantly improved luster. At the same time, the present invention effectively fills nano-gold into the pores of the pearl layer by the swelling effect of the ammonium bicarbonate aqueous solution, and then uses the dehydration effect of absolute ethanol to shrink the pores and discharge the water molecules in the pearl layer, thereby further enhancing the luster of the pearl surface and giving a hint of red blush to the pearl's brilliance, increasing the value of the pearl.

Description

Technical Field

[0001] The present invention relates to a processing method of freshwater pearls, specifically to an immersion solution for enhancing the gloss of freshwater pearls and a pearl processing method. Background Art

[0002] China's freshwater pearl production accounts for a very high proportion worldwide, but the sales volume only accounts for about 8% of the total global pearl industry sales. One of the factors contributing to this is that the quality of Chinese freshwater pearls still has a certain gap compared with foreign pearls. The pearl grading standard is mainly determined by four parts: shape, color, luster, and flaws, among which the strength of luster plays a key role.

[0003] There are also many patent applications for pearl luster processing in China. For example, a method for optimizing the color, luster, and brightness of pearls proposed in CN200610117376.6: The pH value in the container containing washed pearls, solid-phase reagent, and wetting agent is 7 - 8.5. The slightly alkaline solution will have a certain negative impact on pearls.

[0004] For example, a pearl brightening method proposed in CN201110281976.7 includes ammonia water, polyethylene glycol, magnesium hydroxide, and water, and its pH value is alkaline. Long-term immersion of pearls in the aqueous solution will damage their surface structure and lose luster. Therefore, there is an urgent need to provide a new pearl immersion solution and processing method. Summary of the Invention

[0005] The purpose of this invention patent is to provide an immersion solution for enhancing the gloss of freshwater pearls and a pearl processing method to solve one or more problems raised in the above background art.

[0006] To achieve the above purpose, this invention patent provides the following technical solutions: An immersion solution for enhancing the gloss of freshwater pearls, characterized in that

[0007] The pearl immersion solution is divided into four types, namely:

[0008] Pearl immersion liquid A: Mixed by absolute ethanol, polyethylene glycol, and brightening agent;

[0009] Pearl immersion liquid B: Mixed by deionized water, ammonium bicarbonate, polyethylene glycol, and brightening agent;

[0010] Pearl immersion liquid C: Nano-gold ethanol solution;

[0011] Pearl immersion liquid D: Mixed by absolute ethanol, hydrogen peroxide, Tris-HCl buffer, and polyethylene glycol;

[0012] A processing method for enhancing the gloss of freshwater pearls, characterized by including the following steps:

[0013] S1 Pretreatment: Select the pearls that need to enhance the gloss, wash the pearls with pure water, remove the stains attached to the surface of the pearls and dry them naturally;

[0014] S2 Prepare the above-mentioned pearl soaking solution: Pearl soaking solution A, pearl soaking solution B, pearl soaking solution C and pearl soaking solution D;

[0015] S3 Soak the pearls:

[0016] S31 Soak the pearls in the pearl soaking solution A;

[0017] S32 Soak the pearls in the pearl soaking solution B;

[0018] S33 Soak the pearls in the pearl soaking solution C;

[0019] S34 Soak the pearls in the pearl soaking solution D;

[0020] While soaking the pearls, irradiate them with a xenon lamp;

[0021] S4 Wash with water after soaking and dry naturally;

[0022] Preferably, the mass ratio of absolute ethanol, polyethylene glycol, and brightening agent in the pearl soaking solution A is 1000:10:2;

[0023] Preferably, the soaking time in step S31 is 50 hours, and the soaking temperature is 35 - 40 °C;

[0024] Preferably, the mass ratio of the aluminum-magnesium composite salt TPG to the Tris-HCl buffer in the brightening agent is 1:6; Preferably, the mass ratio of deionized water, ammonium bicarbonate, polyethylene glycol, and brightening agent in the pearl soaking solution B is 1000:4:10:2;

[0025] Preferably, the soaking time in step S32 is 30 hours, and the soaking temperature is 15 - 20 °C;

[0026] Preferably, the mass ratio of absolute ethanol, hydrogen peroxide, Tris-HCl buffer, and polyethylene glycol in the pearl soaking solution D is 1000:20:4:10;

[0027] Preferably, the soaking time in step S34 is 55 hours, and the soaking temperature is 20 - 30 °C.

[0028] Preferably, the nano-gold ethanol solution in the pearl soaking solution C is prepared by heating and reacting 50 ml of 0.01% chloroauric acid and 1.5 ml of 1% sodium citrate, centrifuging to remove the water solvent, and adding 50 ml of absolute ethanol solvent.

[0029] Preferably, the soaking time in step S33 is 4 to 6 days, and the soaking temperature is 4 to 8 °C.

[0030] Preferably, the particle size of the nano-gold in the nano-gold ethanol solution is 10 to 15 nm.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] The freshwater pearl processing method provided by the present invention soaks pearls successively with four different soaking solutions, and obtains pearls with significantly improved gloss.

[0033] At the same time, the present invention effectively fills nano-gold into the pores of the pearl layer by using the swelling effect of the ammonium bicarbonate aqueous solution, and then uses the dehydration effect of absolute ethanol to shrink the pores and discharge the water molecules in the pearl layer, thereby further improving the gloss of the pearl surface, and making the pearl shine with a trace of red glow, improving the value of the pearl.

[0034] At the same time, the pH of the pearl soaking solution provided by the present invention is close to neutral, and the nano-gold aqueous solution is centrifuged with absolute ethanol as the solvent, reducing the damage of water molecules to the surface structure of the pearl. Description of the Drawings

[0035] Figure 1 is a microscopic schematic diagram of nano-gold particles entering the pores of the pearl layer. Detailed Embodiments

[0036] The following will describe the present invention in detail with reference to the drawings of the specification, but the solutions of the present invention are not limited thereto.

[0037] The embodiment of the present invention provides a processing method for enhancing the gloss of freshwater pearls to further improve the quality of freshwater pearls, including the following steps:

[0038] S1 Pretreatment: Select imperfect-quality freshwater pearls to be processed as the original pearls to be processed, and preliminarily clean the original pearls with mild pure water to remove the stains attached to the surface of the original pearls. After cleaning, the original pearls are evenly spread on a dry clean cloth and naturally dried in a place where direct sunlight cannot reach indoors.

[0039] S2 Prepare the pearl soaking solution: Mix absolute ethanol, polyethylene glycol, and brightener in a mass ratio of 1000:10:2 to prepare pearl soaking solution A; mix deionized water, ammonium bicarbonate, polyethylene glycol, and brightener in a mass ratio of 1000:4:10:2 to prepare pearl soaking solution B, where the brightener is prepared from aluminum-magnesium composite salt TPG and Tris-HCl buffer; use the nano-gold ethanol solution as pearl soaking solution C; mix absolute ethanol, hydrogen peroxide, Tris-HCl buffer, and polyethylene glycol in a mass ratio of 1000:20:4:10 to prepare pearl soaking solution D.

[0040] The nano-gold ethanol solution is prepared by heating 50 ml of 0.01% chloroauric acid and 1.5 ml of 1% sodium citrate to 115 °C for reaction, then removing the water solvent by high-speed centrifugation and adding 50 ml of anhydrous ethanol solvent. The particle size of the nano-gold in the nano-gold ethanol solution is 10 - 15 nm.

[0041] S3 Soaking the original pearls: Soak the pre-treated original pearls in the pearl soaking solution A, pearl soaking solution B, pearl soaking solution C, and pearl soaking solution D prepared in S2 in sequence for four times. While soaking the original pearls, irradiate them with a xenon lamp. After soaking, wash them with water and dry them naturally to obtain the formed pearls with significantly improved gloss.

[0042] Among them, the soaking time of the original pearls in the pearl soaking solution A is 50 hours, and the soaking temperature is 35 - 40 °C; the soaking time in the pearl soaking solution B is 30 hours, and the soaking temperature is 15 - 20 °C; the soaking time in the pearl soaking solution C is 4 - 6 days, and the soaking temperature is 4 - 8 °C; the soaking time in the pearl soaking solution D is 55 hours, and the soaking temperature is 20 - 30 °C.

[0043] As Figure 1 shown, the surface of the pearl can be regarded as being composed of layers of hexagonal aragonite platelets stacked closely and orderly. There are nano-scale pores between the platelets; the ammonium bicarbonate aqueous solution has a swelling effect on the pearl, opening the pores and promoting the entry of nano-gold particles into the pearl layer to fill the pores; anhydrous ethanol is used as a dehydrating agent to shrink the pores and discharge the unnecessary water molecules in the pearl layer, thereby improving the gloss of the pearl surface and giving the pearl a faint red glow in its luster; finally, the pearl is subjected to final gloss enhancement and repair in the pearl soaking solution D to obtain the formed pearls with further improved gloss and quality.

[0044] Through comparison, it is found that: the reflected light of the pearls not processed by this solution is weak, objects can be seen on the surface, but the image is relatively blurred; the reflected light of the pearls processed by this solution is particularly bright, sharp, and uniform, the surface is like a mirror, the image is very clear, and the gloss and quality are significantly improved.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pearl processing method for enhancing the luster of freshwater pearls, characterized in that, The steps are as follows: S1 Pretreatment: Select the pearls that need to enhance the gloss, wash the pearls with pure water, remove the stains attached to the surface of the pearls and dry them naturally; S2 Prepare the pearl soaking solution. There are four types of pearl soaking solutions, namely: Pearl soaking solution A: Mixed by absolute ethanol, polyethylene glycol, and brightening agent; Pearl soaking solution B: Mixed by deionized water, ammonium bicarbonate, polyethylene glycol, and brightening agent; Pearl soaking solution C: Nano-gold ethanol solution; Pearl soaking solution D: Mixed by absolute ethanol, hydrogen peroxide, Tris-HCl buffer, and polyethylene glycol, In the pearl soaking solution A, the mass ratio of absolute ethanol, polyethylene glycol, and brightening agent is 1000:10:2; In the pearl soaking solution C, the nano-gold ethanol solution is prepared by heating and reacting 50 ml of 0.01% chloroauric acid and 1.5 ml of 1% sodium citrate, centrifuging to remove the water solvent, and adding 50 ml of absolute ethanol solvent; S3 Soak the pearls: S31 Soak the pearls in the pearl soaking solution A; S32 Soak the pearls in the pearl soaking solution B; S33 Soak the pearls in the pearl soaking solution C; S34 Soak the pearls in the pearl soaking solution D; When soaking the pearls, irradiate them with a xenon lamp; S4 Wash with water after soaking and dry naturally.

2. A pearl processing method for enhancing the gloss of freshwater pearls according to claim 1, characterized in that: The soaking time in step S31 is 50 hours, and the soaking temperature is 35 - 40 °C.

3. A pearl processing method for enhancing the gloss of freshwater pearls according to claim 1, characterized in that: The mass ratio of the aluminum-magnesium composite salt TPG to the Tris-HCl buffer in the brightening agent is 1:

6.

4. A pearl processing method for enhancing the gloss of freshwater pearls according to claim 1, characterized in that: In the pearl soaking solution B, the mass ratio of deionized water, ammonium bicarbonate, polyethylene glycol, and brightening agent is 1000:4:10:2; The soaking time in step S32 is 30 hours, and the soaking temperature is 15 - 20 °C.

5. A pearl processing method for enhancing the gloss of freshwater pearls according to claim 1, characterized in that: In the pearl soaking solution D, the mass ratio of absolute ethanol, hydrogen peroxide, Tris-HCl buffer, and polyethylene glycol is 1000:20:4:10; The soaking time in step S34 is 55 hours, and the soaking temperature is 20 - 30 °C.

6. A pearl processing method for enhancing the gloss of freshwater pearls according to claim 1, characterized in that: The soaking time in step S33 is 4 - 6 days, and the soaking temperature is 4 - 8 °C.

7. A pearl processing method for enhancing the luster of freshwater pearls according to claim 1, characterized in that: The particle size of nano-gold in the nano-gold ethanol solution is 10 - 15 nm.

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