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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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

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  • Technology for prolonging service life of etching liquor
  • Technology for prolonging service life of etching liquor
  • Technology for prolonging service life of etching liquor

Examples

Experimental program
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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] S...

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....

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 bet...

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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.

Description

technical field [0001] The invention relates to the technical field of etching, in particular to a process for improving the service life of etching liquid. Background technique [0002] The etching process is hydrofluoric acid on the main component of glass SiO 2 The reaction produces fluorosilicic acid H 2 SiF 6 , specifically: SiO 2 +4HF→SiF 4 +2H 2 O; 3SiF 4 +3H 2 O→H 2 SiO 3 +2H 2 SiF 6 . At the end of the life of the etching solution, the activity of the etching solution is low, not as good as before, and the by-product fluosilicic acid is increasing, which has a certain impact on the edge-cutting effect. [0003] Through the same process conditions of the two etching workshops A and B, the electrical properties of the products etched with 8 million pieces and 18 million pieces were scientifically recorded. The specific data are as follows; [0004] Number of pieces produced Eta Uoc Isc FF Rs. Rsh IRev2 Etchi...

Claims

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Application Information

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IPC IPC(8): C03C15/00
CPCC03C15/00
Inventor 朱军李龙庭陈霞王杰李刚
Owner TONGWEI SOLAR (ANHUI) CO LTD
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