CFC compounds such as CFC-113 and 1,1,1-TCE, etc. have been used in various industries due to their excellent chemical stability, thermodynamic characteristics, non-flammability and anti-corrosiveness. However, in order to protect the earth environment, "the Montreal Protocol on substances that depl...
CFC compounds such as CFC-113 and 1,1,1-TCE, etc. have been used in various industries due to their excellent chemical stability, thermodynamic characteristics, non-flammability and anti-corrosiveness. However, in order to protect the earth environment, "the Montreal Protocol on substances that deplete the ozone layer" was adopted in 1989 to prevent the production and utilization of these CFC compounds and accordingly, alternative cleaning agents have been required in the industry. The objective of this study is to develop non-aqueous cleaning agents which are favorable to the environment and harmless to the human body. It is also necessary that the developed cleaning agents have excellent cleaning efficiency and do not require change cleaning system and generate corrosive materials. In this work, hydrocarbon-based cleaning agents was developed through blending paraffins, glycol ethers and siloxanes in order to effectively clean contaminants such as flux, solder and grease. And physical properties, wetting index, aniline points and solubility parameter of the formulated hydrocarbon-based cleaning agents were studied on the effect of their cleaning ability in this study. The physical properties, wetting index and aniline points of the non-aqueous cleaning agents were measured through experiments and their solubility parameter were calculated based on the Hansen's equation. Measurement results of physical properties of the formulated cleaning agents showed that their density, viscosity, surface tension and vapor pressure were lower than regulated material of CFC-113, MC, 1,1,1-TCE and their flash points except desolder cleaning agents were higher than IPA. The solubility power of the formulated defluxing cleaning agents seemed to be good due to their the lowest aniline point in the middle of formulated cleaning agents. Measurement results of drying ability and residue of the formulated cleaning agents showed as follows : F-2 include much methylene glycol ether for defluxing, S-1, S-2 and S-4 do not include cyclo-pentsiloxane for desoldering, and G-1 for degreasing have the fastest drying speed among those cleaning agents And low residue concentration of the formulated cleaning agents after their drying may be applied to field application without any problems. Test results of cleaning ability of the formulated cleaning agents showed that they were excellent in cleaning contaminants such as flux, solder and grease and that the influencing parameters on their cleaning efficiency were found to be different according to contaminant types. MC(20.3MPa^(1/2)), F-1 (24.2MPa^(1/2)) and F-7(21.5MPa^(1/2)) with similar solubility parameter as flux (21.3MPa^(1/2)) showed 100% cleaning efficiency within 3 minutes in flux cleaning. CFC-113, MC and 1,1,1-TCE with low aniline point less than -20℃ showed excellent cleaning efficiency in solder cleaning. Cleaning agents with high wetting index and low aniline point showed good cleaning efficiency in grease cleaning. Measurement results of cleaning ability of the formulated cleaning agents with increase of their contaminant concentration showed that their cleaning efficiency could be maintained above 90% by control their contaminant concentration below 20wt%, 30wt%, 3wt% for defluxing, desoldering and degreasing, respectively. Distillation seems to be a proper method for refining the contaminated cleaning agents since their physical properties and cleaning abilities were not changed after their distillation. Based on the results of application of the formulated cleaning agents to industrial fields, it was confirmed that they are possible alternative ones to CFC-compounds because of their excellent cleaning ability, good safety and economic efficiency. Result of this study, hydrocarbon-based cleaning agents was developed through blending paraffins, glycol ethers and siloxanes in order to effectively clean contaminants such as flux, solder and grease. Physical properties, wetting index, aniline points and solubility parameter of the formulated hydrocarbon-based cleaning agents could be confirmed their the effect to cleaning ability.
CFC compounds such as CFC-113 and 1,1,1-TCE, etc. have been used in various industries due to their excellent chemical stability, thermodynamic characteristics, non-flammability and anti-corrosiveness. However, in order to protect the earth environment, "the Montreal Protocol on substances that deplete the ozone layer" was adopted in 1989 to prevent the production and utilization of these CFC compounds and accordingly, alternative cleaning agents have been required in the industry. The objective of this study is to develop non-aqueous cleaning agents which are favorable to the environment and harmless to the human body. It is also necessary that the developed cleaning agents have excellent cleaning efficiency and do not require change cleaning system and generate corrosive materials. In this work, hydrocarbon-based cleaning agents was developed through blending paraffins, glycol ethers and siloxanes in order to effectively clean contaminants such as flux, solder and grease. And physical properties, wetting index, aniline points and solubility parameter of the formulated hydrocarbon-based cleaning agents were studied on the effect of their cleaning ability in this study. The physical properties, wetting index and aniline points of the non-aqueous cleaning agents were measured through experiments and their solubility parameter were calculated based on the Hansen's equation. Measurement results of physical properties of the formulated cleaning agents showed that their density, viscosity, surface tension and vapor pressure were lower than regulated material of CFC-113, MC, 1,1,1-TCE and their flash points except desolder cleaning agents were higher than IPA. The solubility power of the formulated defluxing cleaning agents seemed to be good due to their the lowest aniline point in the middle of formulated cleaning agents. Measurement results of drying ability and residue of the formulated cleaning agents showed as follows : F-2 include much methylene glycol ether for defluxing, S-1, S-2 and S-4 do not include cyclo-pentsiloxane for desoldering, and G-1 for degreasing have the fastest drying speed among those cleaning agents And low residue concentration of the formulated cleaning agents after their drying may be applied to field application without any problems. Test results of cleaning ability of the formulated cleaning agents showed that they were excellent in cleaning contaminants such as flux, solder and grease and that the influencing parameters on their cleaning efficiency were found to be different according to contaminant types. MC(20.3MPa^(1/2)), F-1 (24.2MPa^(1/2)) and F-7(21.5MPa^(1/2)) with similar solubility parameter as flux (21.3MPa^(1/2)) showed 100% cleaning efficiency within 3 minutes in flux cleaning. CFC-113, MC and 1,1,1-TCE with low aniline point less than -20℃ showed excellent cleaning efficiency in solder cleaning. Cleaning agents with high wetting index and low aniline point showed good cleaning efficiency in grease cleaning. Measurement results of cleaning ability of the formulated cleaning agents with increase of their contaminant concentration showed that their cleaning efficiency could be maintained above 90% by control their contaminant concentration below 20wt%, 30wt%, 3wt% for defluxing, desoldering and degreasing, respectively. Distillation seems to be a proper method for refining the contaminated cleaning agents since their physical properties and cleaning abilities were not changed after their distillation. Based on the results of application of the formulated cleaning agents to industrial fields, it was confirmed that they are possible alternative ones to CFC-compounds because of their excellent cleaning ability, good safety and economic efficiency. Result of this study, hydrocarbon-based cleaning agents was developed through blending paraffins, glycol ethers and siloxanes in order to effectively clean contaminants such as flux, solder and grease. Physical properties, wetting index, aniline points and solubility parameter of the formulated hydrocarbon-based cleaning agents could be confirmed their the effect to cleaning ability.
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#CFC 탄화수소계 세정제 세정성 평가 Evaluation of Cleaning Ability CFC-Alternative Hydrocarbon-based Cleaning Agents
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