CN117051404B - Gold black water removal and preparation method and application thereof - Google Patents

Abstract

The present application relates to the technical field of gold processing, and specifically discloses a gold black water removal and its preparation method and application. The gold black water removal includes the following ingredients in parts by weight: 10-20 parts of baking soda, 4-8 parts of betaine, 1-3 parts of anionic surfactant, 6-9 parts of complex, 1-5 parts of stabilizer, 0.6-2.7 parts of enzyme preparation, and 80-100 parts of water; the complex is compounded with gluconolactone and octadecylamine; its preparation method is: baking soda, betaine, anionic surfactant, complex, and stabilizer are put into water, mixed evenly, and gold black water removal is obtained. The gold black water removal of the present application has the advantage of removing black spots without affecting the hardness of gold through the synergistic effect between the raw materials.

Description

Gold black water removal and preparation method and application thereof

Technical Field

The application relates to the technical field of gold processing, in particular to gold blacking water and a preparation method and application thereof.

Background

Gold is an elemental form of the chemical element gold, a soft, golden yellow, corrosion resistant precious metal. Gold is not only regarded as a good and rich symbol, but also has its own value, benefiting human life. Not only is the special commodity used for storage and investment, but also is an important material for departments such as jewelry industry, electronic industry, modern communication, aerospace industry and the like.

In the production engineering of gold, especially when gold is used as jewelry, laser welding or butt welding is needed for part of products due to the assembly requirement, the laser welding belongs to a heat conduction type processing mode, the surface of the gold to be processed is heated by utilizing laser radiation, and heat is diffused to the inside through heat conduction. The product is assembled by utilizing a welding processing mode, and although a heat affected zone of the gold ornament can be controlled more accurately, the surface of the gold ornament still has a burnt black color, namely oxides generated in the welding process are attached to the surface of the gold ornament, so that the gold ornament needs to be cleaned in time to restore the quality of the gold ornament.

At present, the gold black spots are treated by hanging sulfuric acid, but the hardness of gold is affected, so how to remove the black spots on gold is a problem to be solved.

Disclosure of Invention

In order to remove black spots without affecting gold hardness, the application provides gold blacking water and a preparation method and application thereof.

In a first aspect, the application provides a gold black water removal method, which adopts the following technical scheme:

The gold black water comprises, by weight, 10-20 parts of baking soda, 15-30 parts of sodium hydroxide, 4-8 parts of betaine, 1-3 parts of anionic surfactant, 6-9 parts of a compound, 1-5 parts of a stabilizer, 0.6-2.7 parts of an enzyme preparation and 80-100 parts of water, wherein the compound is compounded by adopting gluconolactone and octadecylamine.

By adopting the technical scheme, the application adopts baking soda, sodium hydroxide, betaine, anionic surfactant, compound, stabilizer, enzyme preparation and water to blend and compound to obtain the gold black-removing water, the gold black-removing water is used for cleaning gold, and the gold can keep excellent hardness and improve the decontamination rate through the synergistic effect of the raw materials, wherein the decontamination rate is 97.6-99.5%, the surface color is vivid and uniform, and the Vickers hardness value is 117.5HV.

The baking soda is a surface active substance, can react with black spots on gold, can also perform saponification reaction with grease on gold, generates sodium fatty acid dissolved in water, and can not damage gold, thereby achieving the effect of removing the black spots. Sodium hydroxide can also react with black spots on gold, and betaine is extracted from natural plants, has good water solubility, strong foamability and stable foam, and can remove black spots. The anionic surfactant can change the interface property between liquid and between liquid and solid, enhance the compatibility of all raw materials for removing black water, and make all raw materials better play a role, thereby improving the effect of removing black water.

The compound belongs to a nonionic surfactant, the nonionic surfactant does not exist in an ionic state, the stability is high, the compound is not easily influenced by strong electrolyte, acid and alkali, the compatibility is good, and the black removing effect can be improved through cooperation with the anionic surfactant. The compound is compounded by glucolactone and octadecylamine, the glucolactone is prepared from renewable resource starch, amine ester reaction is easy to carry out with alkylamine, and the polyhydroxy structure of glycosyl can form a large number of hydrogen bonds to increase the interaction between surface adsorption molecules, so that the strength of a surface adsorption film is enhanced, the service life of foam is prolonged, and the surface activity, emulsification, foam, thickening and stability are enhanced through the synergistic effect of the glucolactone and the octadecylamine, therefore, the compound is added into raw materials for removing black water, and the removal effect of black spots on gold is further improved under the condition that the gold hardness is not influenced.

Preferably, the compound is prepared by putting octadecylamine and glucolactone into ethanol solution, heating, raising the temperature, reacting for a period of time, cooling, filtering, washing and drying to obtain the compound.

Further, the compound is prepared by putting octadecylamine and glucolactone into ethanol solution, heating to 45-55 ℃, reacting for 1-2h, cooling, filtering, washing with water for 1-3 times, and drying to obtain the compound;

Wherein the mass fraction of the ethanol solution is 95%, and each 1g of the ethanol solution contains 0.4-0.6mL of gluconolactone.

By adopting the technical scheme, the preparation method is used for preparing the compound, so that the octadecylamine and the glucolactone can be better compounded, the compound can be conveniently formed, the compound can be conveniently and better exerted, and the effect of removing black water by gold can be conveniently enhanced.

Preferably, the weight ratio of the octadecylamine to the glucolactone is (0.6-1.4): 1.

The excessive addition of the octadecylamine can cause waste of raw materials, and the excessive addition of the octadecylamine can cause incomplete reaction with the gluconolactone, thereby affecting the formation of a compound. By adopting the technical scheme, when the addition amount of the octadecylamine and the glucolactone is in the range, the octadecylamine and the glucolactone are convenient to form a compound better, and the compound can play a better role, so that the aim of removing gold black spots is fulfilled.

Preferably, the anionic surfactant is one or more of sodium dodecyl sulfate, sodium dioctyl succinate sulfonate and sodium dodecyl benzene sulfonate.

Preferably, the stabilizer is one or more of zinc stearate and calcium stearate.

By adopting the technical scheme, the types of the anionic surfactant and the stabilizer are limited, so that the anionic surfactant and the stabilizer can play a role, and the purpose of removing gold black spots is achieved.

Preferably, the enzyme preparation is a mixture of protease, lipase and lysozyme, and the weight ratio of the protease to the lipase to the lysozyme is 1:1:1.

By adopting the technical scheme, the types of the enzyme preparation are limited, the protease and the lipase can remove oil stains on gold, and the lysozyme can break beta-1, 4 glycosidic bonds between N-acetylmuramic acid and N-acetylglucosamine in cell walls to decompose insoluble mucopolysaccharide on the cell walls into soluble glycopeptides, so that broken cell walls can escape from the content to dissolve bacteria. Through the synergistic effect of the three enzyme preparations, the oil stain black spots remained on gold due to perspiration of a human body can be removed, and bacteria can be removed.

Preferably, the gold black water further comprises 2-6 parts of mixed acid, wherein the mixed acid is a mixture of citric acid and glycolic acid, and the weight ratio of the citric acid to the glycolic acid is 1:1.

Through adopting above-mentioned technical scheme, inject the kind of mixed acid, wherein, citric acid, glycolic acid's acidity is weaker, and is less to gold's corrosivity, and self chelating ability is also stronger, not only can improve gold and remove the stability of black water, can also dissolve other impurity on gold surface, through the synergism between the two, can improve the stability of removing black water, reduces the influence to gold hardness.

In a second aspect, the application provides a preparation method of gold black water removal, which adopts the following technical scheme:

a preparation method of gold black water removal comprises the following steps:

and (3) adding sodium bicarbonate, sodium hydroxide, betaine, anionic surfactant, compound and stabilizer into water, and uniformly mixing to obtain the gold black water.

Preferably, the mixed acid is added simultaneously with the stabilizer.

By adopting the technical scheme, various raw materials are uniformly mixed to obtain black water, so that the raw materials can play a role, and the purpose of removing black spots is achieved under the condition that the gold hardness is not affected.

In a third aspect, the application provides an application of gold to blackwater removal, which adopts the following technical scheme:

An application of gold to blackout water removal comprises the following steps:

placing the gold black water into an ultrasonic machine, heating, placing gold, taking out gold after ultrasonic treatment for a period of time, and washing.

Further, the application of the gold black water removal comprises the following steps:

placing the gold black water into an ultrasonic machine, heating to 60-80 ℃ under the power of 250-300W, placing gold into the ultrasonic machine, taking out the gold after ultrasonic treatment for 5-8s, and washing.

Through adopting above-mentioned technical scheme, put into the gold and remove black water, under the effect of ultrasonic wave, can reach the purpose of getting rid of black spot, and do not influence gold's hardness.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The application adopts the sodium bicarbonate and other alkalinity to remove black water, and utilizes the anionic surfactant and the nonionic surfactant to enhance compatibility, stability and emulsibility through the synergistic effect between the anionic surfactant and the nonionic surfactant, so that the aim of removing black spots is fulfilled under the condition of not influencing gold hardness, the decontamination rate can reach 99.5%, the surface color is vivid and uniform, and the Vickers hardness value is kept at 117.5HV.

2. In the application, citric acid and glycolic acid are preferably adopted as mixed acid to be added into raw materials for removing black water, so that the raw materials are weak in acidity, small in corrosiveness to gold and strong in chelating ability, the stability of the gold for removing black water can be improved, other impurities on the gold surface can be dissolved, the stability of the black water can be improved through the synergistic effect of the citric acid and the glycolic acid, and the influence on the hardness of gold is reduced.

Detailed Description

The present application will be described in further detail with reference to the following specific details.

Raw materials

The anionic surfactant is dioctyl sodium sulfosuccinate and the stabilizer is calcium stearate.

Preparation example

Preparation example 1

A composite prepared by the following method:

And (3) putting 0.6kg of octadecylamine and 1kg of glucolactone into 500L of ethanol solution with the mass fraction of 95%, heating to 50 ℃, reacting for 1.5h, cooling, filtering, washing with water for 3 times, and drying to obtain the compound.

Preparation example 2

A composite was different from that of preparation example 1 in the amount of octadecylamine added, and in preparation example 2, the amount of octadecylamine added was 1kg.

Preparation example 3

A composite was different from that of preparation example 1 in the amount of octadecylamine added, and in preparation example 3, the amount of octadecylamine added was 1.4kg.

Examples

Example 1

The raw material proportion of the gold black water is shown in table 1.

A preparation method of gold black water removal comprises the following steps:

And (3) adding sodium bicarbonate, sodium hydroxide, betaine, an anionic surfactant, the compound prepared by adopting the preparation example 1 and a stabilizer into water, and uniformly mixing to obtain the gold blacking water.

Examples 2 to 3

The difference between the golden black water and the embodiment 1 is that the raw material ratio of the golden black water is different, and the raw material ratio is shown in table 1.

Table 1 raw materials (kg) for removing black Water from gold in different examples

Examples 4 to 5

The difference between the golden black water and the embodiment 2 is that the raw material ratio of the golden black water is different, and the raw material ratio is shown in table 2.

TABLE 2 raw materials for yellow gold removal from Black Water (kg) in different examples

Example 6

A golden blackened water which differs from example 4 in the source of the complex which was prepared using preparation example 2.

Example 7

A golden blackened water which differs from example 4 in the source of the complex which was prepared using preparation 3.

Examples 8 to 10

A golden black water-removing agent is different from example 6 in that mixed acid is added into the black water-removing raw material, and the raw material proportion is shown in Table 3.

TABLE 3 raw materials for yellow gold removal from Black Water (kg) in different examples

Comparative example

Comparative example 1

A golden black water removal process differs from example 1 in that no compound is added to the golden black water removal material.

Comparative example 2

A golden black water removal process differs from example 1 in that the complex in the golden black water removal material is replaced by an equivalent amount of octadecylamine.

Comparative example 3

A golden black water removal process differs from example 1 in that the complex in the golden black water removal material is replaced by gluconolactone in equal amounts.

Comparative example 4

A golden black water removal process differs from example 1 in that the complex in the golden black water removal material is replaced by an equivalent amount of polyoxyethylene fatty acid ester.

Comparative example 5

A golden black removing water is different from example 1 in that the golden black removing water is 40kg of a hydrochloric acid solution with a mass fraction of 38% and 15kg of a nitric acid solution with a mass fraction of 65%.

Application example

Application example 1

An application of gold to blackout water removal comprises the following steps:

placing the gold black water prepared in the embodiment 1 into an ultrasonic machine, heating to 70 ℃ under 275W power, placing gold into the ultrasonic machine, taking out the ultrasonic machine after ultrasonic treatment for 6s, and washing.

Application examples 2 to 10

The difference between the application of the golden black removing water in application examples 2-10 and the application example 1 is that the golden black removing water in application examples 2-10 is prepared by adopting the preparation methods of examples 2-10 respectively.

Comparative examples 1 to 5 were used

The application of the golden black removing water in comparative examples 1 to 5 is different from the application example 1 in that the golden black removing water in application examples 1 to 5 is prepared by adopting comparative examples 1 to 5, respectively.

Performance test

The following performance tests were performed on gold in application examples 1-10 and comparative examples 1-5:

The decontamination rate is that 75 gold jewelry which is prepared under the same batch of the same technological conditions and has basically the same oxidation area is selected, the oxidation area is marked as S1, 5 gold jewelry is used as a group, each group is respectively cleaned in the modes of application examples 1-10 and application comparative examples 1-5, after cleaning, the gold jewelry is stood for 30min, the surface oxidation area of the gold jewelry after decontamination is observed and calculated, the surface oxidation area is marked as S2, the decontamination rate of each group of gold jewelry is calculated, the average value is taken as a final result, and the result is shown in the table 4:

decontamination rate = (S1-S2)/s1×100%

Surface color the gold surface color after decontamination was observed and the results are shown in Table 4.

Vickers hardness value vickers hardness of the electrodeposited layer was measured using a microhardness tester, loading force was 0.98N, loading time was 8s, hardness before gold was not clear was 117.5HV, and the results are shown in table 4.

TABLE 4 detection results

As can be seen from the combination of application examples 1 to 10 and comparative examples 1 to 5, the gold black water of the present application can improve the detergency ratio while maintaining excellent hardness of gold by the synergistic effect between the respective raw materials, wherein the detergency ratio is 97.6 to 99.5%, the surface color is vivid and uniform, and the Vickers hardness value is 117.5HV.

As can be seen from the combination of application examples 1 and comparative examples 1 to 3, application example 1 has a decontamination rate of 97.6%, a bright and uniform surface color, and a Vickers hardness value of 117.5HV, which is superior to that of application examples 1 to 3, and shows that the addition of the compound to the raw materials for removing black water from gold is more suitable, and the decontamination rate can be improved and the black spot on gold can be removed under the condition of ensuring the excellent hardness of gold by the synergistic effect between octadecylamine and gluconolactone.

As can be seen from the combination of application example 1 and comparative example 4, application example 1 has a decontamination rate of 97.6%, a bright and uniform surface color, and a Vickers hardness value of 117.5HV, which is superior to application comparative example 4, and shows that the use of the complex as a nonionic surfactant in the removal of gold black water is more suitable, and the removal of black spots can be further improved without affecting the gold hardness.

As can be seen from the combination of application example 1 and application comparative example 5, the decontamination rate of application example 1 is 97.6%, the surface color is bright and uniform, the Vickers hardness value is 117.5HV, and the method is superior to application comparative example 5, and the method has the advantages that the black spot for removing gold is more suitable, the decontamination rate is high, and the hardness of gold is not influenced.

As can be seen from the combination of application examples 1 to 3, application example 2 has a detergency of 98.1%, a bright and uniform surface color and a Vickers hardness value of 117.5HV, which is superior to other application examples, and shows that the addition amount of the compound in application example 2 is more suitable, and the detergency can be improved while maintaining excellent hardness of gold.

As can be seen from the combination of application examples 4 and 6-7, application example 6 has a decontamination rate of 98.9%, a bright and uniform surface color, and a Vickers hardness value of 117.5HV, which is superior to other application examples, and shows that the compound is more suitable to be prepared by adopting preparation example 2, and can improve the decontamination rate while keeping gold at an excellent hardness.

As can be seen from the combination of application examples 6 and 8-10, application example 9 has a decontamination rate of 99.5%, a bright and uniform surface color, and a Vickers hardness value of 117.5HV, which is superior to other application examples, and shows that the addition of mixed acid to raw materials for removing black water from gold is more suitable, so that the decontamination rate can be further improved while gold maintains excellent hardness.

The embodiments of the present application are all preferred embodiments of the present application, and the scope of the present application is not limited thereby, so that all equivalent changes according to the structure, shape and principle of the present application should be covered.

Claims (8)

1. The gold black water removing agent is characterized by comprising, by weight, 10-20 parts of baking soda, 15-30 parts of sodium hydroxide, 4-8 parts of betaine, 1-3 parts of anionic surfactant, 6-9 parts of a compound, 1-5 parts of a stabilizer, 0.6-2.7 parts of an enzyme preparation and 80-100 parts of water, wherein the compound is prepared by compounding glucolactone and octadecylamine, the enzyme preparation is a mixture of protease, lipase and lysozyme, and the weight ratio of the protease, the lipase and the lysozyme is 1:1:1.

2. A process for preparing the black water from gold includes such steps as putting octadecylamine and glucolactone in alcohol solution, heating, reacting for a certain period of time, cooling, suction filtering, washing and baking.

3. A process for preparing a gold black water according to claim 2, wherein the weight ratio of octadecylamine to gluconolactone is (0.6-1.4): 1.

4. A process for preparing gold black water according to claim 1, wherein the anionic surfactant is one or more of sodium dodecyl sulfate, sodium dioctyl succinate sulfonate and sodium dodecyl benzene sulfonate.

5. The method for removing black water from gold according to claim 1, wherein the stabilizer is one or more of zinc stearate and calcium stearate.

6. The method for removing black water from gold according to claim 1, wherein the black water from gold further comprises 2-6 parts of mixed acid, wherein the mixed acid is a mixture of citric acid and glycolic acid, and the weight ratio of the citric acid to the glycolic acid is 1:1.

7. A method of preparing the gold blackout water according to any one of claims 1 to 5, comprising the steps of:

And (3) adding sodium bicarbonate, sodium hydroxide, betaine, anionic surfactant, compound, stabilizer and enzyme preparation into water, and uniformly mixing to obtain the gold black water.

8. The method of claim 7, wherein the stabilizer and the mixed acid are added simultaneously.