A kind of anti-tarnish protective agent for gold and silver plating and its preparation method and use method

An anti-discoloration and protective agent technology, applied in the direction of metal material coating process, etc., can solve the problem of gold and silver plating layer refusal to solder, etc., to prevent discoloration, oxidation resistance and vulcanization performance, without affecting appearance and conductivity Effect

Active Publication Date: 2019-07-26
深圳市傲新源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gold and silver plating protective agents in the prior art are difficult to be quickly washed off by the flux during soldering, and it is easy to cause the gold and silver plating to resist soldering at high temperatures.

Method used

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  • A kind of anti-tarnish protective agent for gold and silver plating and its preparation method and use method
  • A kind of anti-tarnish protective agent for gold and silver plating and its preparation method and use method
  • A kind of anti-tarnish protective agent for gold and silver plating and its preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0041] Specific embodiment 1 (1kg is example)

[0042] 2-Phenylthiobenzimidazole 100g

[0043] Ethyl xanthate formate 50g

[0044] Oil-in-water dispersant 480g

[0045] Chiral mercaptan modified arylated guanidine salt 110g

[0046] Polyvinyl alcohol 250g

[0047] o-toluic acid 6g;

[0048] Phosphorus oxychloride 4g

[0049] Preparation method:

[0050] (1) Add 100g of 2-phenylthiobenzimidazole and 50g of ethyl xanthate ethyl formate into the oil-in-water dispersant and keep stirring for 30min in a constant temperature water bath at 55°C;

[0051] (2) Keeping the temperature constant, in the state of continuous stirring, slowly add 4g phosphorus oxychloride and 6g o-tolylacetic acid dropwise after adding 250g polyvinyl alcohol in (1), and stir for 5min;

[0052](3) Keeping the temperature constant, add 110 g of chiral mercaptan-modified arylated guanidine salt to (2) under continuous stirring, continue stirring for 1 hour, mix well, keep warm at 55° C. for 3 hours, and ...

specific Embodiment 2

[0058] Specific embodiment 2 (1kg is example)

[0059]

[0060] Chiral mercaptan modified arylated guanidine salt 100g

[0061] Polystyrene 80g

[0062] Polyethylene glycol 150g

[0063] 13g o-methylphenylacetic acid;

[0064] Phosphorus oxychloride 7g

[0065] Preparation method:

[0066] (1) Add 50g of 2-phenyl-5-benzimidazole sulfonic acid and 150g of ethyl cellulose xanthate formate to 480g of oil-in-water dispersant and continue stirring for 30min in a constant temperature water bath at 58°C;

[0067] (2) Keeping the temperature constant, under continuous stirring, add 80g polystyrene and 150g polyethylene glycol to (1) and slowly add 7g phosphorus oxychloride and 13g o-tolylacetic acid dropwise, and stir for 5min ;

[0068] (3) Keeping the temperature constant, add chiral thiol-modified arylated guanidine salt to (2) under continuous stirring, continue stirring for 1 hour, mix well, keep warm at 58° C. for 2.5 hours, and then pack and use.

[0069] Instructions...

specific Embodiment 3

[0074] Specific embodiment 3 (1kg is example)

[0075]

[0076]

[0077] Preparation method:

[0078] (1) Add 80g of 2-(2-aminophenyl)-1H-benzimidazole and 100g of ethyl isobutylxanthate formate to 550g of oil-in-water dispersant and keep stirring for 30min in a constant temperature water bath at 60°C;

[0079] (2) Keeping the temperature constant, in the state of continuous stirring, slowly add 3g of phosphorus oxychloride and 2g of 3-mercaptobenzoic acid dropwise after adding 100g of polyvinyl chloride in (1), and stir for 5min;

[0080] (3) Keeping the temperature constant, add 165g of chiral thiol-modified arylated guanidine salt to (2) under continuous stirring, continue stirring for 1 hour, mix well, keep warm at 60°C for 3 hours, and then pack it for use.

[0081] Instructions:

[0082] (1) Put 500 g of deionized water in a beaker, add 50 g of the protective agent composition of Example 3, stir to dissolve it completely, and add deionized water to make the volum...

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PUM

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Abstract

The invention relates to a treatment agent for metal after plating, in particular to a gold plating and silver plating anti-discoloration protective agent, and a preparation method and using method thereof. The gold plating and silver plating anti-discoloration protective agent includes a benzimidazole compound, a xanthate compound, an oil-in-water dispersant, mercaptan modified aromatic guanidinesalt, a polymer and a suspension agent. The preparation method of the gold plating and silver plating anti-discoloration protective agent comprises the steps that at the constant temperature of waterbath heating, the benzimidazole compound and the xanthate compound are placed in the oil-in-water dispersant, the polymer and the suspension agent are added, and then the mercaptan modified aromaticguanidine salt is added. The using method of the gold plating and silver plating anti-discoloration protective agent comprises the steps that the anti-discoloration protective agent is dissolved in water, and a plated workpiece is immersed into the water. The anti-discoloration protective agent has the advantages that antioxidant and anti-vulcanization properties are outstanding; technological operation is easy, abrasion resistance is high, and the welding property of the workpiece is not affected; and the workpiece is easy to clean, the anti-discoloration protective agent has no harm to the environment, and the electrical properties of the platings are basically not affected.

Description

technical field [0001] The invention relates to a post-treatment agent for metal plating, in particular to a gold-plating and silver-plating anti-discoloration protective agent and a preparation method and application method thereof. Background technique [0002] The traditional surface protection of gold and silver layers mainly includes chemical passivation, electrochemical passivation, electrophoresis, coating solvent-based protective agent, galvanic passivation, electroplating precious metals, organic complex passivation film and other methods. Chemical passivation and electrochemical passivation require the use of chromic anhydride and potassium dichromate, and the passivation layer contains Cr(Ⅵ), which does not meet the requirements of the RoHS directive and the WEEE directive of the EU regulations; toxic solvents are often used for coating solvent-based protective agents, causing Environmental pollution and staff health problems, and the electrophoresis method will c...

Claims

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Application Information

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IPC IPC(8): C23C22/02
CPCC23C22/02
Inventor 田成辉
Owner 深圳市傲新源科技有限公司
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