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No-clean soldering flux and preparation method of no-clean soldering flux

A flux and no-cleaning technology, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of unfavorable environmental protection, water pollution, high cost, etc., and achieve the effect of complete use, good safety, and increased fluidity

Inactive Publication Date: 2014-05-21
THE NORTHWEST MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent cleaning type has high solid content, strong metal removal and oxidation ability, good welding quality, and excellent wetting performance, but it must be cleaned with CFC, which is expensive and not conducive to environmental protection; the water cleaning type contains halogens and organic acids, good welding effect, and low cost. Low, but contains halides, which is easy to cause corrosion and also causes water pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The no-cleaning flux of this embodiment is made of the following raw materials in mass percentage: 3.0% of organic acid activator, 1.8% of nonionic surfactant, 0.5% of antioxidant, 0.01% of modified rosin, and the balance is organic solvent; The organic acid activator is succinic acid; the nonionic surfactant is fatty alcohol polyoxyethylene ether; the organic solvent is a mixture of diethylene glycol and glycerol in a mass ratio of 1:1; the The antioxidant is benzotriazole; the modified rosin is polymerized rosin.

[0028] The preparation method of the no-clean flux of the present embodiment comprises the following steps:

[0029] Step 1, taking organic acid activator, nonionic surfactant, antioxidant, modified rosin and organic solvent respectively according to mass percentage;

[0030] Step 2, heating and melting the modified rosin weighed in step 1 under stirring conditions;

[0031] Step 3, sequentially adding the organic acid activator weighed in step 1, the non...

Embodiment 2

[0034] The no-cleaning flux of the present embodiment is the same as that of Embodiment 1, wherein the difference is that the organic acid activator is glutaric acid, itaconic acid, o-hydroxybenzoic acid, sebacic acid, pimelic acid, malic acid or Succinic acid, or at least two of succinic acid, glutaric acid, itaconic acid, o-hydroxybenzoic acid, sebacic acid, pimelic acid, malic acid and succinic acid; phenolic polyoxyethylene ether, fatty acid polyoxyethylene ester, pentaerythritol fatty acid ester, sucrose fatty acid ester or sorbitan fatty acid ester, or fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether At least two of oxyethylene esters, pentaerythritol fatty acid esters, sucrose fatty acid esters and sorbitan fatty acid esters; the organic solvent is ethylene glycol, ethylene glycol ethyl ether, ethylene glycol butyl ether and polyethylene glycol A mixture of any one of the alcohols with diethylene glycol, or at leas...

Embodiment 3

[0037] The no-cleaning flux of this embodiment is made of the following raw materials in mass percentage: 2.5% organic acid activator, 2% nonionic surfactant, 1% antioxidant, 0.012% modified rosin, and the balance is organic solvent; The organic acid activator is glutaric acid; the nonionic surfactant is alkylphenol polyoxyethylene ether; the organic solvent is a mixture of glycerol and ethylene glycol in a mass ratio of 10:1 ; The antioxidant is benzotriazole; the modified rosin is hydrogenated rosin.

[0038] The preparation method of the no-clean flux of the present embodiment comprises the following steps:

[0039] Step 1, taking organic acid activator, nonionic surfactant, antioxidant, modified rosin and organic solvent respectively according to mass percentage;

[0040] Step 2, heating and melting the modified rosin weighed in step 1 under stirring conditions;

[0041] Step 3, sequentially adding the organic acid activator weighed in step 1, the nonionic surfactant wei...

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Abstract

The invention provides no-clean soldering flux which comprises, by mass, 1%-4% of organic acid activating agents, 0.5%-3% of non-ionic surface active agents, 0.1%-3% of antioxidants, 0.005%-0.02% of modified rosin and the balanced organic solvents. The invention further provides a preparation method of the no-clean soldering flux. The preparation method includes the steps of melting the modified rosin, sequentially adding the organic acid activating agents, the non-ionic surface active agents, the antioxidants and the organic solvents, evenly stirring the mixture, naturally cooling the mixture, filtering the mixture, and obtaining the no-clean soldering flux. According to the no-clean soldering flux, dilution and dilution control are not required, direct use can be achieved, heavy metal is not contained, and residues do not exist. The no-clean soldering flux has the advantages of being high in drying speed, bright and firm in soldering point, even in spreading, full in structure, free of corrosiveness, excellent in solderability, good in soldering smoothing performance, stable in performance and the like.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a no-cleaning flux and a preparation method thereof. Background technique [0002] No-clean flux refers to a substance that can help and promote the soldering process in the soldering process, and has a protective effect and prevents oxidation reactions. No-clean flux can be divided into solid no-clean flux, liquid no-clean flux and gas no-clean flux. [0003] In the process of surface mounting of electronic circuits, no-cleaning flux is mainly used to eliminate the oxide film on the surface of the material to be soldered and the solder powder itself, so that the solder alloy rapidly diffuses and adheres to the surface of the metal to be welded, so no-cleaning flux The choice directly affects the quality and reliability of electronic products. With the development of fine-pitch devices, electronic products are more obviously showing high integration and hi...

Claims

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Application Information

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IPC IPC(8): B23K35/36
CPCB23K35/3612B23K35/362
Inventor 陈庆谊董文卫张瑶瑶张红艳谢阔
Owner THE NORTHWEST MACHINE
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