Polyisobutylene Cleaning Wipe for Residue-Free Beryllium Removal
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Solution Overview
Problem
Current cleaning media struggle to effectively remove contamination from surfaces without leaving residues, particularly in industrial settings where stringent cleanliness standards require the removal of contaminants like beryllium to non-detectable levels, and existing filtration systems face challenges in reducing fluid resistance while maintaining filtration efficiency.
Innovation Solution
A cleaning medium comprising a substrate with polyisobutylene (PIB) fibers, where a substantial portion of PIB has a molecular weight greater than 30,000, applied either on the surface or within the substrate, along with droplets that enhance contamination entrapment and removal without leaving residues, and a method of manufacturing involving dissolving PIB in solvents like alkanes or isoparaffins to create a tackifier solution for application and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tackifier is added to a cleaning medium to improve contamination removal, then cleaning efficiency is improved, but the cleaning medium may stick to the article being cleaned and leave unwanted residue
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight of polyisobutylene (greater than 30,000) and its concentration (1-10 wt%) to optimize the balance between tackiness for contamination removal and residue formation. This specific parameter range allows the cleaning medium to effectively remove contamination while minimizing unwanted residue on the cleaned surface.
Solution Approach 2:
The patent uses a composite material system combining polyisobutylene with specific molecular weight characteristics and alkane/isoparaffin solvents to create a cleaning medium that achieves both effective contamination removal and minimal residue. The composite nature of this formulation allows synergistic effects where the polymer provides tackiness while the solvent system controls residue formation.
2Productivity
If cleaning products become more efficient in removing original contamination, then contamination removal capability is improved, but the cleaning products may contribute to final contamination level due to chemical residues
Solution Approach 1:
The patent addresses this contradiction by changing the chemical parameters of the cleaning medium - specifically using high molecular weight polyisobutylene (>30,000) which provides strong contamination removal capability while the molecular weight itself prevents the polymer from forming unwanted residues. The controlled concentration range (1-10 wt%) further ensures that the cleaning medium removes contamination effectively without contributing to final contamination levels.
3Ease of operation
If a lubricant or release agent is added to decrease friction between cleaning medium and article, then ease of operation is improved, but cleaning efficiency is reduced and unwanted residue is left
Solution Approach 1:
The patent resolves this contradiction by changing the fundamental parameter of the cleaning medium's chemical composition - using polyisobutylene with molecular weight greater than 30,000 which inherently provides appropriate friction characteristics without requiring additional lubricants or release agents. This parameter change allows the medium to glide smoothly over surfaces while maintaining high cleaning efficiency and avoiding unwanted residue from additive materials.
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 cleaning medium effectively removes contamination to non-detectable levels without leaving residues, as demonstrated by tests on beryllium-contaminated surfaces and respirator cartridges, while maintaining fluid flow efficiency and reducing the risk of inadvertent contaminant release.
Implementation Method 1
a cleaning medium that includes a substrate having a bulk mass and a front surface having fibers. Polyisobutylene is disposed on the fibers. A substantial portion of the polyisobutylene has a molecular weight greater than approximately 30,000
Implementation Method 2
A method of making a cleaning medium is also provided. The method includes the step of dissolving polyisobutylene having a molecular weight over 30,000 in a solvent that includes an alkane, an isoparaffin, an aliphatic compound, a cycloaliphatic compound, or a dipentene to make a tackifier solution
Implementation Method 3
droplets disposed on the treated fibers, and the droplets typically have a length that is between approximately one and five times the treated thickness of the treated fibers
Data Source
AI summary
A method of removal of beryllium contamination from an article is disclosed. The method typically involves dissolving polyisobutylene in a solvent such as hexane to form a tackifier solution, soaking the substrate in the tackifier to produce a preform, and then drying the preform to produce the cleaning medium. The cleaning media are typically used dry, without any liquid cleaning agent to rub the surface of the article and remove the beryllium contamination below a non-detect level. In some embodiments no detectible residue is transferred from the cleaning wipe to the article as a result of the cleaning process.