Grafted Polyethylene Filter for Metal Removal
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Solution Overview
Problem
Current metal removal filters face challenges in achieving high metal removal performance while maintaining a high flow rate and preventing denaturation of organic solvents, with nonwoven fabrics having non-uniform gaps and polyethylene films with sulfonic acid groups causing solvent denaturation.
Innovation Solution
A metal removal filtering material with a polyethylene porous base material and graft chains, where the graft rate and functional groups are regulated within specific ranges, and a cartridge filter design incorporating pleating-processed filtering material to ensure high metal removal performance and solvent stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the basis weight of the base material is increased to increase the contact area with liquid, then the metal removal performance is improved, but the flow rate per unit area decreases
Solution Approach 1:
The invention changes the basis weight parameter to a specific range (30-120 g/m²) to optimize the balance between contact area and flow rate. This parameter optimization allows sufficient metal removal performance while maintaining adequate flow rate per unit area, resolving the contradiction between these two requirements.
2Reliability
If sulfonic acid groups are introduced into the polyethylene film to achieve high metal removal performance, then the metal removal ability is improved, but hydrogen ions discharged denature the organic solvent
Solution Approach 1:
The invention changes the functional group parameter from sulfonic acid groups to amino groups (primary, secondary, or tertiary), which have different chemical properties. Amino groups do not discharge hydrogen ions that denature organic solvents, thus maintaining metal removal performance while eliminating the harmful effect on the solvent.
Solution Approach 2:
The invention converts the potential harm of strong acid cation exchange groups (which denature solvents) into a beneficial solution by using amino groups that provide metal removal capability without the harmful side effect of solvent denaturation. This transforms the problem of solvent compatibility into a solution.
3Ease of manufacture
If a polyethylene nonwoven fabric is used as base material, then the manufacturing is simplified, but the gaps between fibers are non-uniform and contact area with liquid is small
Solution Approach 1:
The invention uses a polyethylene porous film instead of nonwoven fabric. The porous film structure provides uniform pores and larger contact area with liquid, improving metal removal performance while maintaining ease of manufacture through established porous film production techniques.
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 solution provides a filter with high metal removal performance and a high flow rate, preventing organic solvent denaturation and ensuring the filter's structural integrity through controlled graft rates and functional group introduction.
Implementation Method 1
a cartridge filter constituted of a fiber material produced by introducing an ion exchange group or a chelate functional group into a polyethylene nonwoven fabric by a radiation graft polymerization method
Implementation Method 2
introducing an ion exchange group or a chelate functional group into a polyethylene nonwoven fabric
Implementation Method 3
introducing an ion exchange group or a chelate functional group
Data Source
AI summary
A metal removal filtering material having a basis weight of 30 to 120 g/m2 including a polyethylene porous base material and graft chains fixed to the polyethylene porous base material and having a functional group. The graft chains have a graft rate of 40 to 150%. The functional group is selected from a quaternary ammonium group, a primary, secondary, or tertiary amino group, an iminodiacetic acid group, a phosphate group, and an iminodiethanol group.