Unlock instant, AI-driven research and patent intelligence for your innovation.

Environment-friendly tin stripping solution and preparation method thereof

An environmentally friendly and tin stripping technology is applied in the field of environmentally friendly tin stripping liquid and its preparation, which can solve the problems of corrosion of copper layer, harm to human health and ecological environment, increasing the difficulty of processing tin stripping waste liquid, etc., and achieves a simple preparation method. , fast effect

Active Publication Date: 2021-04-16
上海昕沐化学科技有限公司
View PDF9 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an environment-friendly tin stripping solution and a preparation method thereof. The environment-friendly tin stripping solution comprises the following components according to volume concentration: 50-300 g / L of concentrated sulfuric acid, 1-20 g / L of hydrogen peroxide, and 5 tin ion complexing agents. ~30g / L, hydrogen peroxide accelerator 0.5~50g / L, hydrogen peroxide stabilizer 1~20g / L, copper surface corrosion inhibitor 0.1~5g / L, and the balance is water. Slowly add concentrated sulfuric acid into water to make it dissolve, then cool to normal temperature, then add copper surface corrosion inhibitor, tin ion complexing agent, hydrogen peroxide accelerator, hydrogen peroxide stabilizer, hydrogen peroxide in turn, stir until completely dissolved, then dilute with water, An environment-friendly tin stripping solution can be obtained. The environment-friendly tin stripping liquid in the present invention can effectively strip tin and tin-copper alloy layers, and does not generate harmful gas, does not corrode the metal copper layer, and does not generate sludge precipitation during the reaction process, and the waste liquid produced in the reaction process is easy to treat. Conducive to the recycling of metal tin.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/30
CPCC23F1/30
Inventor 章磊
Owner 上海昕沐化学科技有限公司