Environment-friendly detinning liquid and preparation method thereof

An environment-friendly, tin-removing technology, applied in the field of environment-friendly tin-removing liquid and its preparation, can solve problems such as corrosion of copper layer, human health and ecological environment hazards, unfavorable recycling of metal tin, etc., to solve the problem of high ammonia nitrogen content, preparation Simple method, fast effect

Active Publication Date: 2019-04-16
上海昕沐化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is nitric acid tin stripping potion or nitric acid-organic sulfonic acid tin stripping potion, since the waste liquid produced contains residual nitric acid and by-product nitrous acid and other compounds, it is very harmful to human health and the ecological environment, and it is difficult to Meet the environmental protection requirements of green production of PCB enterprises
The Chinese patent with the publication number CN105714298A discloses a tin stripper of a sulfuric acid-iron salt system, with concentrated sulfuric acid and iron sulfate as the main components. Although the use of nitric acid is avoided, the Fe in it 3+ It is easy to react with the substrate copper to form Fe 2+ and Cu 2+ , so the reaction time must be strictly controlled during production, otherwise the copper layer will be corroded, and it is difficult to meet the requirements of the tin stripping process
In addition, under acidic conditions Fe 3+ The existence of tin stripping increases the difficulty of the treatment of tin stripping waste liquid, which is not conducive to the recycling of metal tin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An environment-friendly tin stripping solution, the contents of each component are as follows: concentrated sulfuric acid 100g / L, hydrogen peroxide 10g / L, sulfamic acid 10g / L, cyclohexylamine 5g / L, ethylene glycol monobutyl ether 2g / L, benzene And triazole 0.5g / L, the balance is water.

[0033] The preparation method of the above-mentioned environment-friendly tin stripping solution is as follows: firstly, the concentrated sulfuric acid is miscible with water, and after the temperature is cooled to normal temperature, benzotriazole, sulfamic acid, cyclohexylamine and ethylene glycol monobutyl ether are added successively, and finally Add hydrogen peroxide, stir until completely dissolved, then dilute to 1 liter with water.

[0034] The evaluation results of the above environment-friendly tin stripping solution are as follows: (1) The electroplated tin layer on the surface of a 5 cm × 5 cm copper clad laminate was completely stripped off within 1 minute in the tin stripp...

Embodiment 2

[0036] An environment-friendly tin stripping solution, the contents of each component are as follows: concentrated sulfuric acid 50g / L, hydrogen peroxide 30g / L, 70% concentration methanesulfonic acid 20g / L, cyclopentylamine 1g / L, ethylene glycol phenyl ether 2g / L L, tolyl benzotriazole 1g / L, the balance is water.

[0037] The preparation method of the above-mentioned environment-friendly tin stripping solution is as follows: firstly, the concentrated sulfuric acid is miscible with water, and after the temperature is cooled to normal temperature, then sequentially add tolutriazole, 70% concentration methanesulfonic acid, cyclopentylamine and ethylene disulfide. Alcohol phenyl ether, finally add hydrogen peroxide, stir until completely dissolved, then dilute to 1 liter with water.

[0038]The evaluation results of the above environment-friendly tin stripping solution are as follows: (1) The electroplated tin layer on the surface of a 5 cm × 5 cm copper clad laminate was complete...

Embodiment 3

[0040] An environment-friendly tin stripping solution, the contents of each component are as follows: concentrated sulfuric acid 300g / L, hydrogen peroxide 5g / L, sulfamic acid 50g / L, piperidine 5g / L, ethylene glycol monoethyl ether 2g / L, imidazole 5g / L L, the balance is water.

[0041] The preparation method of the above-mentioned environment-friendly tin stripping solution is as follows: firstly, the concentrated sulfuric acid and water are miscible, and after the temperature is cooled to normal temperature, sequentially add imidazole, sulfamic acid, piperidine and ethylene glycol monoethyl ether, and finally add hydrogen peroxide, and stir until completely After dissolving, dilute to 1 liter with water.

[0042] The evaluation results of the above environment-friendly tin stripping solution are as follows: (1) The electroplated tin layer on the surface of a 5 cm × 5 cm copper clad laminate was completely stripped off within 1 minute in the tin stripping solution, exposing a u...

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Abstract

The invention discloses environment-friendly detinning liquid and a preparation method thereof. The environment-friendly detinning liquid comprises the following components of, by volume concentration, 50-300g/L of concentrated sulfuric acid, 1-20g/L of hydrogen peroxide, 5-30g/L of a tin ion complexing agent, 0.5-50g/L of a hydrogen peroxide accelerator, 1-20g/L of a hydrogen peroxide stabilizer,0.1-5g/L of a copper surface corrosion inhibitor and the balance water. The concentrated sulfuric acid is slowly added into the water, after the concentrated sulfuric acid and the water are mixed andcooled to the normal temperature, the copper surface corrosion inhibitor, the tin ion complexing agent, the hydrogen peroxide accelerator, the hydrogen peroxide stabilizer and the hydrogen peroxide are added in sequence and then stirred to dissolve completely, then, constant volume is achieved with the water, and the environment-friendly detinning liquid can be obtained. The environment-friendlydetinning liquid can effectively remove the tin layer and the tin-copper alloy layer, harmful gas is not generated in the reaction process, the metal copper layer is not corroded, sludge sediment is not generated, waste liquid generated in the reaction process is easy to process, and metal tin recycling is facilitated.

Description

technical field [0001] The invention relates to the technical field of stripping metal coatings, in particular to an environment-friendly tin stripping solution and a preparation method thereof. Background technique [0002] Printed circuit board (English name Printed Circuit Board, referred to as PCB) is an important electronic component that carries electronic components and realizes the function of the whole machine with insulating and conductive materials as the medium. In the manufacturing process of printed circuit boards, the copper surface of the PCB metal circuit needs to be plated with metal tin as a protective layer, and the non-circuit copper layer that is not protected by tin is removed by alkaline etching process, and then the tin protective layer is removed with tin stripping solution , to get the final PCB circuit pattern. [0003] According to the different main components contained, tin stripping solutions used in the PCB industry can be divided into three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/30
CPCC23F1/30
Inventor 章磊
Owner 上海昕沐化学科技有限公司
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