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A kind of preparation method of halogen-free no-clean flux for solder paste

A no-cleaning and flux technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of short storage time, large residue after welding, high corrosion, etc., and achieve less residue after welding and bright solder joints Strong and good welding performance

Inactive Publication Date: 2019-04-26
兑元工业科技(惠州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is: aiming at the problem that the traditional no-cleaning flux has short storage time, many residues after welding, and most of them contain halogen, so that the residues after welding are relatively corrosive, and a soldering flux is provided. The preparation method of the halogen-free no-cleaning flux for the paste, the invention first prepares the compound organic acid activator, then wraps it with hydrogenated rosin, grinds and sieves after filtering and drying to obtain the rosin-wrapped organic acid activator, and finally mixes it with the emulsifier Add OP-10, benzotriazole, etc. to diethylene glycol ether to disperse evenly, then add film-forming substances and preservatives, mix evenly, filter with gauze, and collect the filtrate to obtain halogen-free no-cleaning flux for solder paste , the halogen-free no-cleaning flux for soldering paste prepared by the organic acid activator in the present invention has excellent soldering performance, less residue, no corrosion to the substrate, realizes the purpose of no-cleaning, and does not pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Weigh 2g of malic acid, 2g of fumaric acid, and 2g of benzilic acid, mix them with 40mL of deionized water, stir at 300r / min for 10min in a constant temperature water bath at 50°C, then add 4mL of succinic acid, 2mL of adipic acid, Continue to stir 2 mL of sucrose acetate isobutyrate at constant temperature for 15 minutes to obtain a compound organic acid active agent; add 18 g of hydrogenated rosin to the above compound organic acid active agent, stir at 300 r / min for 3 hours in a constant temperature water bath at 75 ° C, and cool to room temperature Filter, place the filter residue in a drying oven, dry to constant weight at 105°C, then transfer the filter residue to a mortar for grinding, and pass through a 60-mesh sieve to obtain the rosin-wrapped organic acid active agent; weigh 20g rosin-wrapped organic acid active agent Add 0.1g of emulsifier OP-10, 0.1g of benzotriazole, 20mL of absolute ethanol into 30mL of diethylene glycol ether, heat to 30°C, and stir at 300...

example 2

[0018] Weigh 3g of malic acid, 3g of fumaric acid, and 4g of benzilic acid, mix them with 60mL of deionized water, stir at 400r / min for 15min in a constant temperature water bath at 60°C, then add 6mL of succinic acid and 4mL of adipic acid, Continue to stir 5mL sucrose acetate isobutyrate at constant temperature for 20min to obtain a compound organic acid active agent; add 25g hydrogenated rosin to the above compound organic acid active agent, stir at 400r / min for 4h in a constant temperature water bath at 80°C, and cool to room temperature Filter, place the filter residue in a drying oven, dry to constant weight at 110°C, then transfer the filter residue to a mortar for grinding, and pass through a 60-mesh sieve to obtain the rosin-wrapped organic acid active agent; weigh 25g rosin-wrapped organic acid active agent Add 0.3g of emulsifier OP-10, 0.2g of benzotriazole, 30mL of absolute ethanol into 40mL of diethylene glycol ether, heat to 40°C, and stir at 400r / min for 40min, t...

example 3

[0021] Weigh 3g of malic acid, 3g of fumaric acid, and 3g of benzilic acid, mix them with 50mL of deionized water, stir at 350r / min for 13min in a constant temperature water bath at 55°C, then add 5mL of succinic acid and 3mL of adipic acid, 4mL of sucrose acetate isobutyrate continued to stir at constant temperature for 18min to obtain a compound organic acid active agent; add 21g of hydrogenated rosin to the above compound organic acid active agent, stir at 350r / min for 4h in a constant temperature water bath at 78°C, and cool to room temperature Filter, place the filter residue in a drying oven, dry to constant weight at 108°C, then transfer the filter residue to a mortar for grinding, and pass through a 60-mesh sieve to obtain the rosin-wrapped organic acid active agent; weigh 23g rosin-wrapped organic acid active agent Add 0.2g of emulsifier OP-10, 0.2g of benzotriazole, 25mL of absolute ethanol into 35mL of diethylene glycol ether, heat to 35°C, and stir at 350r / min for 3...

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Abstract

The invention relates to a preparing method of a halogen-free no-clean flux for a soldering paste and belongs to the technical field of no-clean fluxes. The preparing method comprises the following steps: first, preparing a compound organic acid activator, and then, wrapping by using hydrogenated rosin; after filtering and drying, grinding and sieving to make an organic acid activator wrapped by the rosin; finally adding the organic acid activator wrapped by the rosin, an emulsifier OP-10, benzotriazole and the like into diethylene glycol diethyl ether, uniformly dispersing, and then adding a film forming substance and a preservative; and after uniformly mixing, filtering by using gauze, collecting filtrate, and obtaining the halogen-free no-clean flux for the soldering paste. The halogen-free no-clean flux for the soldering paste, which is prepared by using the organic acid activator, has excellent welding performance, is small in residue quantity, is not corrosive to a base plate, achieves a no-clean purpose and does not pollute an environment.

Description

technical field [0001] The invention relates to a preparation method of a halogen-free no-clean flux used for solder paste, and belongs to the technical field of no-clean flux. Background technique [0002] Flux is an important process material in the electronic and electrical industry. Its quality not only affects the control of efficiency, pass rate, and cost in the production process of electronic and electrical products, but also affects the follow-up long-term reliability of electronic and electrical products. plays a key role. Flux is a substance uniformly mixed with various raw materials, and it is mainly composed of solvents, activators, film-forming agents, and surfactants. When using different ratios of raw materials and different preparation methods, the flux will show different performance and long-term reliability. The role of flux is mainly manifested in: removing oxides, reducing the surface tension of the material to be welded, preventing re-oxidation, assi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/363
CPCB23K35/3612B23K35/362
Inventor 仇颖超张潇赵玉林
Owner 兑元工业科技(惠州)有限公司
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