Environmental-friendly water-soluble flux and preparation method thereof

A water-soluble, flux technology, used in welding equipment, welding media, manufacturing tools, etc., can solve problems such as insufficient wetting ability of lead-free solder, high melting point, and increased volatilization of active agents in flux

Inactive Publication Date: 2010-10-06
NINGBO YINYANG TIN SOLDER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Sn-Ag-Cu alloys are a type of lead-free solder that has been studied internationally and has good application prospects. However, it was found during research and use that compared with traditional Sn-Pb solder, Sn-Ag- Cu-based lead-free solder has poor wettability, is easy to oxidize, and has a high melting point
Therefore, the flux suitable for Sn-Pb solder is not suitable for Sn-Ag-Cu lead-free solder. One is that this kind of flux can not help the wetting ability of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put 60 grams of anhydrous citric acid, 40 grams of DL-malic acid, 45 grams of triethanolamine, and 200 grams of deionized water into a mixing tank, raise the temperature to 50°C, and stir for 1 hour. After they are fully mixed, add 120 grams of modified Non-toxic polyvinyl alcohol, 90 grams of polymethyl acrylate, 3 grams of vinyl acetate-ethylene copolymer powder, 2 grams of hydroxyethyl methyl cellulose ether, and rapidly heated to 90 ° C, fully stirred for 2 hours, rapidly cooled and rapidly Stir, filter, dry, and pulverize to obtain 360 grams of white powder A;

[0027] 200 grams of ethanol, 400 grams of glycerin, 100 grams of ethylene glycol butyl ether, 400 grams of ethylene glycol, 15 grams of isooctyl phenoxyethylene ether, 15 grams of benzotriazole, 2 grams of p-phenol, 80 grams Put the modified polyvinyl alcohol and 50 grams of polymethyl acrylate into the mixing tank, raise the temperature to 40°C, and after stirring for 2 hours, slowly add 360 grams of white...

Embodiment 2

[0030] Put 50 grams of anhydrous citric acid, 40 grams of DL-malic acid, 40 grams of triethanolamine, and 100 grams of deionized water into a mixing tank, raise the temperature to 40°C, and stir for 0.5 hours. After they are fully mixed, add 90 grams of modified Non-toxic polyvinyl alcohol, 70 grams of polymethyl acrylate, 2 grams of vinyl acetate-ethylene copolymer powder, 2 grams of hydroxyethyl methyl cellulose ether, and rapidly heated to 90 ° C, fully stirred for 2 hours, rapidly cooled and rapidly Stir, filter, dry, and pulverize to obtain 294 grams of white powder A;

[0031] 200 grams of ethanol, 100 grams of isopropanol, 300 grams of glycerin, 100 grams of ethylene glycol butyl ether, 300 grams of ethylene glycol, 10 grams of isooctyl phenoxyethylene ether, 2.5 grams of octylphenol polyoxyethylene ether , 12 grams of benzotriazole, 1.5 grams of p-phenol, 100 grams of modified polyvinyl alcohol, and 70 grams of polymethyl acrylate were placed in a mixing tank, heated t...

Embodiment 3

[0033] Put 50 grams of anhydrous citric acid, 50 grams of DL-malic acid, 50 grams of triethanolamine, and 100 grams of deionized water into a mixing tank, raise the temperature to 45°C, and stir for 1 hour. After they are fully mixed, add 80 grams of modified Polyvinyl alcohol, 100 grams of polymethyl acrylate, 3 grams of vinyl acetate-ethylene copolymer powder, 3 grams of hydroxyethyl methyl cellulose ether, and rapidly heated to 85 ° C, fully stirred for 4 hours, rapidly cooled and rapidly Stir, filter, dry, and pulverize to obtain 336 grams of white powder A;

[0034] 100 grams of ethanol, 200 grams of isopropanol, 400 grams of glycerin, 100 grams of ethylene glycol butyl ether, 400 grams of ethylene glycol, 13 grams of isooctyl phenoxyethylene ether, 2 grams of fatty alcohol polyoxyethylene ether, Put 15 grams of benzotriazole, 2 grams of p-phenol, 100 grams of modified polyvinyl alcohol, and 70 grams of polymethyl acrylate into the mixing tank, raise the temperature to 50...

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Abstract

The invention relates to an environmental-friendly water-soluble flux which is matched with lead-free solder; the environmental-friendly water-soluble flux comprises anhydrous citric acid, DL-malic acid, triethanolamine, modified polyvinylalcohol, polymethyl acrylate, vinyl acetate-ethylene copolymer powder, hydroxyethyl methyl cellulose ether, surfactant, benzotriazol, phenol and mixed solvent; the anhydrous citric acid, the DL-malic acid, the triethanolamine, the modified polyvinylalcohol, the polymethyl acrylate, the vinyl acetate-ethylene copolymer powder and the hydroxyethyl methyl cellulose ether are prepared into a complex active substance A through microencapsulated coating treatment; and the mixed solvent, the surfactant, the benzotriazol, the phenol, the modified polyvinylalcohol, the polymethyl acrylate and the complex active substance A are uniformly mixed by weight ratio to obtain the environmental-friendly water-soluble flux. The environmental-friendly water-soluble flux can effectively assist lead-free solder, particularly applicable to Sn-Ag-Cu lead-free solder, can enhance the solderability of the lead-free solder, can adapt to the high welding temperature requirement on the lead-free solder, has small action to the corrosion of lead-free solder alloys and little residue after welding, can be cleaned by water, has good welding point quality, clean surface and strong stability, and a dried circuit board has higher insulation resistance value.

Description

technical field [0001] The invention relates to flux, in particular to an environment-friendly water-soluble flux for lead-free solder and a preparation method thereof. Background technique [0002] Sn-Pb alloy, as the main packaging material in the modern electronics industry, plays a dominant role in the assembly of electronic components, and has the characteristics of low cost, good electrical conductivity, and excellent mechanical welding performance. However, lead and lead compounds are poisonous and harmful substances. Solder is harmful to human health in the process of production and use, and it is easy to cause cancer. Soldering waste will also seriously pollute the environment. With the increasingly perfect and strict environmental protection laws and regulations, the call for prohibiting the use of lead is growing louder and louder. [0003] Therefore, various countries have promulgated laws and regulations prohibiting the use of lead-containing solder in the elec...

Claims

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Application Information

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IPC IPC(8): B23K35/362B23K35/40B23K35/363
Inventor 史济杰
Owner NINGBO YINYANG TIN SOLDER
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