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Novel Cleaning Technology using Fluorochemical Fluids as Solvent Dryers

IP.com Disclosure Number: IPCOM000248450D
Publication Date: 2016-Nov-30
Document File: 4 page(s) / 284K

Publishing Venue

The IP.com Prior Art Database

Abstract

This paper describes a novel cleaning technology using fluorochemical fluids as solvent dryers for replacement of water from the AQ cleaning process.

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Novel Cleaning Technology using Fluorochemical Fluids as Solvent Dryers

This paper describes a novel cleaning technology using fluorochemical fluids as solvent dryers for replacement of water from the AQ cleaning process.

This paper aims to describe the following:

1. A novel cleaning method using fluorochemical fluids as Solvent Dryer

2. Cleaning of parts eg: HDD parts to achieve high efficiency for water removal / replacement after AQ cleaning process

3. Analysis of Pre / Post Clean parts by optical microscope to determine the effect of water removal using fluorochemical fluids as Solvent Dryer

4. Analysis of Pre / Post Clean parts by FTIR to determine the presence of water content

Background

Fluorochemical fluids are widely used in solvent precision cleaning systems due to their excellent cleaning performance, nonflammability, and low toxicity. Low emissive losses and low drag-out losses in the system also help to contribute to cost savings.

The base molecules in many fluorochemical cleaning fluids are segregated, nonflammable hydrofluoroethers (HFEs). The presence of the ether oxygen in these compounds, combined with the segregation of the hydrogen atoms from the fluorine atoms around that oxygen, result in an ideal combination of environmental and safety properties. Unlike fluorochemical fluids based on hydrochlorofluorocarbon (HCFC) and hydofluorocarbon (HFC) technology, these segregated HFE's offer zero ozone depletion potential and low global warming potential. The proper balance of vapor pressure, low water solubility, low surface tension, low heat of vaporization and solvency makes these materials excellent cleaning solvents to be used in a solvent precision cleaning systems.

Fluorochemical fluids can be used "neat" to remove light contamination such as particles, hydrocarbon and silicone oils. Fluorochemical fluids are ideal for cleaning particles, halogenated oils and greases. These solvents function effectively in the removal of particulate from components and final assemblies. Also, when needed, azeotropic mixes of HFE and isopropyl alcohol may help to increase solvency while maintaining excellent materials compatibility.

In this study, fluorochemical fluids are shown to act as solvent dryers in water removal / replacement from AQ cleaning process. The fluorochemical has very low solubility with water and has a higher density than water; as such, good separation between the fluorochemical fluid and water is possible. In this way, water that is removed by the fluorochemical fluid will form a layer on top of the fluorochemical and is eventually removed by the solvent cleaning system. This new cleaning technology helps to further develop and expand the range of cleaning ability for these products in improving current AQ cleaning process challenges.

The a typical solvent precision cleaning system as shown in Figure 1 below which is widely used in the industry is recommended to as a basic platform for fluorochemical fluid...