Hydrofluorocarbon Cleaning Composition for Electronics
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Solution Overview
Problem
Existing electronics cleaners are not environmentally stable, can damage plastic components, and pose challenges in safely cleaning electronic devices due to variability in plastic types used, often causing aesthetic or structural harm.
Innovation Solution
A cleaning composition comprising a hydrofluorocarbon blend of pentafluoropropane and decafluoropentane, which is non-flammable, non-conductive, and has low toxicity, effectively removing contaminants like dust, solder, and flux without leaving residues, and is safe for various plastics, including polycarbonate and ABS blends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chlorofluorocarbons (CFCs) are used for cleaning electronics, then cleaning effectiveness is improved, but environmental stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing CFCs with hydrofluorocarbon (HFC) blends, specifically using HFC-134a and HFC-125 in various proportions. This substitution maintains the cleaning effectiveness while improving environmental stability by eliminating ozone-depleting substances.
Solution Approach 2:
The invention uses composite cleaning formulations consisting of multiple HFC components blended together. These composite formulations combine the advantages of individual HFCs to achieve both effective cleaning performance and environmental compatibility, replacing single-component CFC systems.
2Reliability
If strong cleaning agents are used to remove contaminants, then cleaning effectiveness is improved, but harm to plastic components increases
Solution Approach 1:
The patent applies the concept of local quality by formulating cleaning compositions with specific HFC blends that have appropriate solvent strength for different contaminant types while being gentle on plastic surfaces. The formulation is tailored to provide sufficient cleaning power for electronics contaminants without excessive strength that would harm plastics.
Solution Approach 2:
The invention changes the chemical parameters of the cleaning agent by using HFCs with specific boiling points, vapor pressures, and solvent properties. These parameter adjustments ensure the cleaner is effective at removing flux, solder, and dust while evaporating quickly without leaving residues that could damage plastic components.
3Reliability
If cleaning composition evaporates quickly to leave no residue, then cleanliness is improved, but flammability risk increases
Solution Approach 1:
The patent carefully selects HFC components with specific physical parameters including boiling points and flash points. The blend is formulated to achieve rapid evaporation for residue-free cleaning while maintaining flash points above certain temperature thresholds to reduce flammability risks during normal use and storage conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hydrofluorocarbon blend provides robust cleaning properties while being safe for plastics, non-flammable, and non-conductive, ensuring effective contamination removal without harming electronic components or leaving residues, making it suitable for a wide range of electronic devices.
Implementation Method 1
The cleaning compositions should sufficiently evaporate so as to leave no or substantially no residue
Data Source
AI summary
A cleaning composition suitable for cleaning electronic components includes a blend of hydrofluorocarbons and one or more C1-C5 alcohols. The composition may include from about 1.0 to about 20% by weight of 1,1,1,3,3 pentafluoropropane and from about 75 to about 98.9% by weight of 1,1,1,2,3,4,4,5,5,5 decafluoropentane, and from about 0.1 to about 5% by weight of isopropyl alcohol.