Method for preparing solution of tin methane sulfonate

A technology of tin methane sulfonate and methane sulfonic acid, which is applied in the electrolysis process, electrolysis components, electrolytic organic production and other directions, can solve the problems of high cost of tin methane sulfonate, the quality is difficult to meet the requirements of electronic electroplating, and the like. The effect of less equipment investment, high product purity and low energy consumption

Inactive Publication Date: 2009-10-21
XIAOCHANG GOLDEN COCK CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tin methanesulfonate synthesized by stannous oxide, stannous chloride, tin powder, etc. is either expensive, or the quality is difficult to meet the requirements of electronic plating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of tin methanesulfonate solution adopts diaphragm electrolysis to prepare tin methanesulfonate aqueous solution, and it comprises the steps:

[0016] 1) Use an anion exchange membrane to separate the electrolytic cell into a cathode chamber and an anode chamber, take 1Kg of metal tin with a mass content of 99.99% and cast an anode plate with a length of 0.15m and a width of 0.10m, and place it in the anode chamber, and add 1L, mass Concentration is 40% methanesulfonic acid solution (representing that methanesulfonic acid accounts for 40g in 100g methanesulfonic acid solution) as electrolytic solution; Add a methanesulfonic acid solution with a mass concentration of 30% (meaning that methanesulfonic acid accounts for 30g in 100g methanesulfonic acid solution);

[0017] The anion exchange membrane is a homogeneous anion exchange membrane with a water content of 60% (mass), an exchange capacity ≥ 1.6mol / KG (dry), and a membrane surface resistance ≤ 4...

Embodiment 2

[0020] The preparation method of tin methanesulfonate solution adopts diaphragm electrolysis to prepare tin methanesulfonate aqueous solution, and it comprises the steps:

[0021] 1) adopt anion-exchange membrane to separate electrolytic cell into cathode chamber and anode chamber, and the electrolytic solution of anode chamber adopts mass concentration as 20% methanesulfonic acid solution (representing that methanesulfonic acid accounts for 20g in 100g methanesulfonic acid solution) , the electrolytic solution of cathodic chamber adopts mass concentration as 10% methanesulfonic acid solution (representing that methanesulfonic acid accounts for 10g in 100g methanesulfonic acid solution); The cathode adopts copper plate;

[0022] The anion exchange membrane is a homogeneous anion exchange membrane with a water content of 40% (mass), an exchange capacity ≥ 1.6mol / KG (dry), and a membrane surface resistance ≤ 4.0Ω.cm 2 , migration number ≥ 0.97;

[0023] 2) The anode and cathod...

Embodiment 3

[0025] The preparation method of tin methanesulfonate solution adopts diaphragm electrolysis to prepare tin methanesulfonate aqueous solution, and it comprises the steps:

[0026] 1) adopt anion-exchange membrane to separate electrolytic cell into cathode chamber and anode chamber, and the electrolytic solution of anode chamber adopts mass concentration as 40% methanesulfonic acid solution (representing that methanesulfonic acid accounts for 40g in 100g methanesulfonic acid solution) , the electrolytic solution of cathodic chamber adopts mass concentration to be the methanesulfonic acid solution of 50% (representing that methanesulfonic acid accounts for 50g in the 100g methanesulfonic acid solution); Cathode adopts tin plate;

[0027] The anion exchange membrane is a homogeneous anion exchange membrane with a water content of 90% (mass), an exchange capacity ≥ 1.6mol / KG (dry), and a membrane surface resistance ≤ 4.0Ω.cm 2 , migration number ≥ 0.97;

[0028] 2) The anode and...

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Abstract

The invention relates to a method for preparing a solution of tin methane sulfonate for electroplating. The method is characterized by comprising the following steps that: 1) an anion exchange membrane is used for dividing an electrolytic cell into a cathode chamber and an anode chamber, wherein the electrolyte used in the anode chamber is a solution of methane sulfonic acid with the mass concentration of between 20 and 40 percent, and the electrolyte used in the cathode chamber is a solution of methane sulfonic acid with the mass concentration of between 10 and 50 percent; the anode in the anode chamber is made of a tin plate or tin flower, and the cathode in the cathode chamber is made of a tin plate or copper plate; and 2) the anode and the cathode are connected with a DC power supply for electrolysis, the electrolytic temperature is between 20 and 60 DEG C, and under the action of the DC with the voltage of 1.8 to 3V, the anode is subjected to anodic dissolution and enters the anode chamber; and when the concentration of tin ion in the anode chamber reaches between 100 and 130g/L, the electrolysis stops, and the electrolyte in the anode chamber is taken out and filtered, and the filtrate is subjected to vacuum concentration at a temperature of between 40 and 120 DEG C, so that the solution of tin methane sulfonate, of which the content of tin ion is 300 to 310g/L, can be obtained. The method has the advantages of less equipment investment, simple process and high product purity.

Description

technical field [0001] The invention belongs to the technical field of special chemicals for electroplating, and in particular relates to a method for preparing an aqueous solution of tin methanesulfonate for electronic electroplating. Background technique [0002] Tin and tin-lead alloy coatings have been widely used in the electronics industry due to their excellent corrosion resistance and solderability. However, in recent years, due to the great restriction of lead, the electroplating tin process will become the main plating type of solderable coating in electronic electroplating. Previous tin plating baths were mainly based on highly polluting fluoroborates, phenol sulfonates, and halides. In recent years, the sulfate tin plating process has greatly improved environmental pollution, but the baths are unstable. Methanesulfonate tin plating can basically solve the above problems and has high industrial application value. Therefore, the tin plating process of tin methane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/32C25B3/02C25B3/23
Inventor 曾丹田汪志君黄卫陆国博何本刚
Owner XIAOCHANG GOLDEN COCK CHEM
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