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A kind of preparation method of alkaline electroplating tin brightener

A technology of tin electroplating and brightener, which is applied in the field of preparation of tin electroplating brightener, and can solve the problems of low brightness of alkaline electroplating tin

Inactive Publication Date: 2016-11-09
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low brightness of the existing alkaline electroplating tin, and provide a preparation method of an alkaline electroplating tin brightener

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] (1) Mix 25ml of isopropanol and 40ml of acetaldehyde in a 500ml beaker, immerse the beaker in an ice-water bath, and control the temperature of the mixture below 15°C;

[0007] (2) Add 30 ml of sodium hydroxide aqueous solution with a mass fraction of 10% dropwise within 30 minutes, stir while adding, and control the temperature of the whole process to be lower than 15°C;

[0008] (3) After the dropwise addition, stir at 15°C for 30 minutes, then add 13 ml of o-toluidine dropwise within 30 minutes while keeping the temperature below 20°C;

[0009] (4) Transfer the above product into a 500ml three-necked flask, add 100ml of isopropanol, then raise the temperature to 60°C, and stir at 62±2°C for 90 minutes;

[0010] (5) Add 90 ml of ethanol, 90 ml of formaldehyde, 4 g of nicotinic acid, 12 g of β-naphthol, and 65 g of alkylphenol polyoxyethylene (21) ether in sequence, stir for 30 minutes, and keep the temperature at 62±2°C;

[0011] (6) Add 40 ml of formic acid dropwise...

Embodiment 2

[0015] (1) Mix 50ml of isopropanol and 80ml of acetaldehyde in a 1000ml beaker, immerse the beaker in an ice-water bath, and control the temperature of the mixture below 15°C;

[0016] (2) Add 60 ml of sodium hydroxide aqueous solution with a mass fraction of 10% dropwise within 30 minutes, stir while adding, and control the temperature of the whole process to be lower than 15°C;

[0017] (3) After the dropwise addition, stir at 15°C for 30 minutes, then add 26 ml o-toluidine dropwise within 30 minutes while keeping the temperature below 20°C;

[0018] (4) Transfer the above product into a 1000ml three-necked flask, add 200ml of isopropanol, then raise the temperature to 60°C, and stir at 62±2°C for 90 minutes;

[0019] (5) Add 180 ml of ethanol, 180 ml of formaldehyde, 8 g of nicotinic acid, 24 g of β-naphthol, and 130 g of alkylphenol polyoxyethylene (21) ether, stir for 30 minutes, and keep the temperature at 62±2°C;

[0020] (6) Add 80 ml of formic acid dropwise within 30...

Embodiment 3

[0024] (1) Mix 75ml of isopropanol and 120ml of acetaldehyde in a 2000ml beaker, immerse the beaker in an ice-water bath, and control the temperature of the mixture below 15°C;

[0025] (2) Add 90 ml of sodium hydroxide aqueous solution with a mass fraction of 10% dropwise within 30 minutes, stir while adding, and control the temperature of the whole process to be lower than 15°C;

[0026] (3) After the dropwise addition, stir at 15°C for 30 minutes, then add 39 ml of o-toluidine dropwise within 30 minutes while keeping the temperature below 20°C;

[0027] (4) Transfer the above product into a 2000ml three-neck flask, add 300ml of isopropanol, then raise the temperature to 60°C, and stir at 62±2°C for 90 minutes;

[0028] (5) Add 270 ml of ethanol, 270 ml of formaldehyde, 12 g of nicotinic acid, 36 g of β-naphthol, and 195 g of alkylphenol polyoxyethylene (21) ether, stir for 30 minutes, and keep the temperature at 62±2°C;

[0029] (6) Add 120ml of formic acid dropwise within...

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PUM

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Abstract

The invention discloses a preparation method of an alkaline tin plating brightener. The method comprises: uniformly mixing isopropanol and acetaldehyde at a temperature lower than 15°C; adding sodium hydroxide aqueous solution dropwise within 0.5 hours, Stir while adding; after the dropwise addition, add o-toluidine dropwise again, keeping the temperature below 20°C; add isopropanol and then raise the temperature to 60‑65°C and stir for 1.5 hours; add ethanol, formaldehyde, nicotinic acid, β‑ Naphthol and alkylphenol polyoxyethylene (21) ether were stirred for more than 0.5 hours; within 0.5 hours, dropwise added formic acid and raised the temperature to 70-75°C and stirred for more than 2 hours; added 4-phenyl-3-butene-2-ketone , after stirring for 0.5 hours at a temperature of 70-75°C; naturally cool to room temperature, and add some pure water to obtain an alkaline electroplating tin brightener. The addition amount of the brightener for alkaline electroplating tin of the present invention is 3-5% of the integral fraction of electroplating liquid, solves the problem of the brightener for alkaline electroplating tin at present.

Description

technical field [0001] The invention relates to a preparation method of a brightener for electroplating tin, in particular to a preparation method of an alkaline brightener for electroplating tin. Background technique [0002] Tin plating is anti-corrosion, non-toxic and solderable, and is widely used in various industrial fields, especially the electronic industry. Due to restrictions on heavy metals such as hexavalent chromium and cadmium, the tin plating industry has been more widely used. Since no brightener to improve the brightness of the tin coating has been found in the alkaline electro-tin plating process, the tin coating of the alkaline electro-tin plating has poor brightness, which is an obvious shortcoming. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of an alkaline tin plating brightener in order to solve the problem of low brightness of the existing alkaline tin plating. [0004] The preparation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/30
CPCC25D3/30
Inventor 孟江燕王云英
Owner NANCHANG HANGKONG UNIVERSITY