Technology for prolonging service life of etching liquor

A liquid medicine and life-span technology, applied in the field of etching, can solve the problems of increasing dark current, decreasing filling factor, decreasing open-circuit voltage, etc., so as to achieve the effect of prolonging service life, increasing solubility and ensuring etching uniformity.

Active Publication Date: 2017-08-29

TONGWEI SOLAR (ANHUI) CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0006] From the data in the table, it can be seen that the etching workshop A produces 18 million pieces, the life of the etching solution is at the end, the property of the etching solution deteriorates, the etching efficiency is reduced, and the open circuit voltage is reduced,...

Method used

Accelerate the diffusion of reactant through magnetic field cavitation, make mixed solution increase solvency, promote the generation of precipitate (X2) (SiF ) n, make precipitate (X2) (SiF ) n more stable, by filtering out precipitation The substance (X2)(SiF6)n (fluorosilicate) removes the impurities formed in the etching solution without generating new impurities;

The neutral salt and the ethoxylate compound of the etching liquid quality 2~15% that liquid activity is low, neutral salt can react rapidly and quantitatively with the fluosilicic acid in ...

Abstract

The invention discloses a technology for prolonging the service life of etching liquor. The technology comprises the following steps: 1) adding 2%-15% of neutral salt into the etching liquor with low liquor activity, and meanwhile, adding 1.3%-4% of an oxethyl compound, wherein the reaction formula of SiF62-anion in the etching liquor and magnetic cation hydrolyzed in the neutral salt is as shown in the specification and the reaction formula of H<+> cation in the etching liquor and anion hydrolyzed in the neutral salt is as shown in the specification; 2) cavitating the uniformly stirred mixed solution in a magnetic field with strength of 20-40kHz, and then filtering out sediment (X2)(SiF6)n in the cavitated solution and making the solution with the sediment(X2)(SiF6)n filtered out pass through ion exchange resin, thereby acquiring filtrate; 3) adding deionized water into the filtrate acquired in the step 2) and keeping the pH value from 1.8 to 2.3. According to the technology, the service life of the etching liquor can be prolonged, the liquor activity can be guaranteed, the replacing period of the etching liquor can be prolonged and the isolating rate trend in the prolonging period of the service life thereof is stable.

Technology Topic

Saline waterChemistry +6

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Examples

Experimental program(3)
Effect test(1)

Example Embodiment

[0025] Example 1

[0026] A process to increase the life of the etching solution includes the following steps:

[0027] Step 1): Add a neutral salt of 2% by mass to the etching solution with low chemical activity, and at the same time add an ethoxy compound with a mass of 13‰, mix and stir;

[0028] SiF in etching solution 6 2- The general formula for the reaction of anions and magnetic cations in neutral salt solution is as follows:

[0029] H in etching solution + The general formula for the anion reaction of cation and neutral salt solution is as follows:

[0030] Step 2): The mixed solution after stirring is cavitation with a magnetic field strength of 20kHz, and then the precipitate in the cavitation solution (X 2 )(SiF 6 ) n Filter out, filter out the precipitate (X 2 )(SiF 6 ) n The latter solution is passed through ion exchange resin to obtain filtrate;

[0031] Step 3): Add deionized water to the filtrate in step 2) to form a new solution, keeping the pH at 1.8-2.3.

[0032] Step 1) The neutral salt is a strong acid and strong base salt, and the cation is Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Cr 3+ Or Al 3+ Ion, anion is Cl - , SO 4 2- Or NO 3 - Acid radical ion.

[0033] In step 1), the ethoxy compound is polyethoxylated fatty alcohol or ethoxylated acetylene glycol.

[0034] In step 2), the ion exchange resin is a macroporous strongly acidic cationic resin, a macroporous strongly basic anion resin or a combination of the two.

[0035] In step 3), the pH value of the new solution is detected by a pH tester to control the amount of deionized water.

Example Embodiment

[0036] Example 2

[0037] A process for improving the life of the etching solution includes the following steps:

[0038] Step 1): Add 9% of the neutral salt by mass to the etching solution with low chemical activity, and at the same time add 25‰ of the ethoxy compound, mix and stir;

[0039] SiF in etching solution 6 2- The general formula for the reaction of anions and magnetic cations in neutral salt solution is as follows:

[0040] H in etching solution + The general formula for the anion reaction of cation and neutral salt solution is as follows:

[0041] Step 2): The mixed solution after stirring is cavitation with a magnetic field strength of 30kHz, and then the precipitate in the cavitation solution (X 2 )(SiF 6 ) n Filter out, filter out the precipitate (X 2 )(SiF 6 ) n The latter solution passes through ion exchange resin to obtain filtrate;

[0042] Step 3): Add deionized water to the filtrate in step 2) to form a new solution, and maintain the pH value between 1.8 and 2.3.

[0043] Step 1) The neutral salt is a strong acid and strong base salt, and the cation is Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Cr 3+ Or Al 3+ Ion, anion is Cl - , SO 4 2- Or NO 3 - Acid radical ion.

[0044] In step 1), the ethoxy compound is polyethoxylated fatty alcohol or ethoxylated acetylene glycol.

[0045] In step 2), the ion exchange resin is a macroporous strongly acidic cationic resin, a macroporous strongly basic anion resin or a combination of the two.

Example Embodiment

[0046] Example 3

[0047] A process for improving the life of the etching solution includes the following steps:

[0048] Step 1): Add a neutral salt of 15% by mass to the etching solution with low chemical activity, and at the same time add an ethoxy compound with a mass of 40‰, mix and stir;

[0049] SiF in etching solution 6 2- The general formula for the reaction of anions and magnetic cations in neutral salt solution is as follows:

[0050] H in etching solution + The general formula for the anion reaction of cation and neutral salt solution is as follows:

[0051] Step 2): The mixed solution after stirring is cavitation with a magnetic field intensity of 20-40kHz, and then the precipitate in the cavitation solution (X 2 )(SiF 6 ) n Filter out, filter out the precipitate (X 2 )(SiF 6 ) n The latter solution is passed through ion exchange resin to obtain filtrate;

[0052] Step 3): Add deionized water to the filtrate in step 2) to form a new solution, and maintain the pH value between 1.8 and 2.3.

[0053] Step 1) The neutral salt is a strong acid and strong base salt, and the cation is Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Cr 3+ Or Al 3+ Ion, anion is Cl - , SO 4 2- Or NO 3 - Acid radical ion.

[0054] In step 1), the ethoxy compound is polyethoxylated fatty alcohol or ethoxylated acetylene glycol.

[0055] In step 2), the ion exchange resin is a macroporous strongly acidic cationic resin, a macroporous strongly basic anion resin or a combination of the two.

[0056] The neutral salt and ethoxy compound of 2-15% of the quality of the etching solution with low chemical activity. The neutral salt can react quickly and quantitatively with the fluorosilicic acid in the etching solution to form insoluble precipitates. (X- 2 )(SiF 6 ) n (Fluorosilicate), while the H in fluorosilicic acid + Ions and neutral salt anions such as: Cl - , SO 4 2- Or NO 3 - Acid radical ions react to re-form acid and maintain the activity of the etching solution. The ethoxy compound ensures the uniformity of etching;

[0057] The magnetic field cavitation accelerates the diffusion of the reactants, increases the dissolving ability of the mixed solution, and promotes the precipitation (X 2 )(SiF 6 ) n The formation of the precipitate (X 2 )(SiF 6 ) n More stable, by filtering out the precipitate (X 2 )(SiF 6 ) n (Fluorosilicate) The impurities formed in the introduced etching solution are removed, and no new impurities are generated;

[0058] The filtered solution can be exchanged for the remaining cations/anions or anions or by-product SiF in the etching solution through ion exchange resin 4 , To extend the service life of the etching solution.

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Lignin porous microspheres based on W/O/W type multiple emulsion solvent volatilization and preparation method and application thereof

ActiveCN114656677Astrong stabilizing effectImprove solvency

Owner:SOUTH CHINA UNIV OF TECH

Ultrasonic application of heat exchanger

PendingCN110849203AImprove solvencyImproved scale dissolution ability

Owner:广东爱尼智能家电制造有限公司

Classification and recommendation of technical efficacy words

Improve solvency

Technology for prolonging service life of etching liquor

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