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Soldering flux composition containing cyclohexane citrate

A technology of cyclohexylamine citrate and cyclohexylamine citric acid is applied in welding medium, welding equipment, welding/cutting medium/material and other directions, which can solve problems such as harm to human health and ecological environment, and achieve low environmental pollution, Enhanced fluxing capability and excellent performance

Inactive Publication Date: 2012-01-04
广州化学试剂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the printed circuit board industry basically uses cyclohexylamine hydrochloride and cyclohexylamine hydrobromide as soldering flux additives, but both cyclohexylamine hydrochloride and cyclohexylamine hydrobromide contain organic halogens, which will Seriously endanger human health and the ecological environment, so countries have formulated a series of halogen-free / low-halogen industry standards

Method used

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  • Soldering flux composition containing cyclohexane citrate

Examples

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preparation example 1

[0043] Weigh 210 grams of citric acid monohydrate into a 1000 mL beaker, add 400 mL of pure water and stir to dissolve, filter and clarify for later use. Add 317 grams of cyclohexylamine in another 1000mL beaker, slowly add the filtered and clear citric acid solution under stirring (50r / min), and react completely at 80°C. At this time, the solution is transparent, and the pH of the solution is 8.5. Heat and concentrate until a crystal film appears, pour the concentrated crystals into a clean dish and let cool to form a block, then make small blocks and dry at 85°C for 4 hours to obtain 451.4 g of the product, with a yield of 98.4%. Detection, the content is 99.3 (in (C 6 h 13 N) 3 ·C 6 h 8 o 7 meter), the contents of Cl, F, and Br are all <10ppm.

preparation example 2

[0045] Weigh 210 grams of citric acid monohydrate into a 1000 mL beaker, add 400 mL of pure water and stir to dissolve, filter and clarify for later use. Add 307 grams of cyclohexylamine in another 1000mL beaker, slowly add the filtered and clear citric acid solution under stirring (50r / min), and react completely at 80°C. At this time, the solution is transparent, and the pH of the solution is 7.5. Heat and concentrate until a crystal film appears, pour the concentrated crystals into a clean dish and let cool to form a block, then make small blocks and dry at 80°C for 4 hours to obtain 445.8 g of the product, with a yield of 97.2%. Detection, the content is 99.1 (in (C 6 h 13 N) 3 ·C 6 h 8 o 7 meter), the contents of Cl, F, and Br are all <10ppm.

preparation example 3

[0047]Weigh 210 grams of citric acid monohydrate into a 1000 mL beaker, add 400 mL of pure water and stir to dissolve, filter and clarify for later use. Add 327 grams of cyclohexylamine in another 1000mL beaker, slowly add the filtered and clear citric acid solution under stirring (50r / min), and react completely at 90°C. At this time, the solution is transparent, and the pH of the solution is 9. Heat and concentrate until a crystal film appears, pour the concentrated crystals into a clean dish and let cool to form a block, then make small blocks and dry at 95°C for 3 hours to obtain 453.6 g of the product, with a yield of 98.9%. Detection, the content is 99.3 (in (C 6 h 13 N) 3 ·C 6 h 8 o 7 meter), the contents of Cl, F, and Br are all <10ppm.

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Abstract

The invention discloses a soldering flux composition containing cyclohexane citrate, and also discloses a method for preparing the cyclohexane citrate and an application of the cyclohexane citrate as an additive of the soldering flux. The cyclohexane citrate has the purity of above 99 percent and is prepared by the method comprising the following steps of: 1, taking citric acid, adding pure water, heating and dissolving completely, and then filtering and clarifying; 2, slowly adding the filtered citric acid solution in the corresponding quantity of cyclohexane under the condition of stirring, reacting at a temperature of 60-90 DEG C, and finally adding the cyclohexane or citric acid to regulate pH to be 7.5-9; 3, heating and concentrating until a crystal coating occurs, pouring a heat solution in a tray while heating for cooling to be in a block shape; and 4, cutting the blocky cyclohexane citrate in the tray into small blocks, and drying at a temperature of 80-95 DEG C to obtain the soldering flux composition. The soldering flux composition containing the cyclohexane citrate has low cost, less environment pollution and enhanced soldering capacity.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to flux (or flux composition) containing cyclohexylamine citrate. Background technique [0002] At present, the printed circuit board industry basically uses cyclohexylamine hydrochloride and cyclohexylamine hydrobromide as soldering flux additives, but both cyclohexylamine hydrochloride and cyclohexylamine hydrobromide contain organic halogens, which will Seriously endanger human health and the ecological environment, so countries have formulated a series of halogen-free / low-halogen industry standards. Most of the current "halogen-free" requirements come from some industry standards, and the current "halogen-free" requirements in the industry only require Br and Cl among the halogen elements. For example, the Japan Electronics Circuit Association (JPCA), the International Electrotechnical Commission (IEC), and the International Electronics Industry Connection Associati...

Claims

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Application Information

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IPC IPC(8): B23K35/362
Inventor 喻小琦李帅刘红梅谷芳芳
Owner 广州化学试剂厂
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