The performance of the RO EDI ultra pure water equipment exchange membrane is comprehensive, and it is necessary to evaluate and analyze the membrane based on its photocatalytic performance, organic chemical performance, and physical and mechanical properties.

1. Conductivity (membrane resistance)

Generally, it is indicated by conductivity (Ω -1. cm-1) or electrical resistivity (Ω. cm), and it is also common to use membrane surface resistance, which is the resistance per unit area of the membrane (Ω. cm2), to indicate the main purpose of the resistance in medical treatment. Generally speaking, the lower the resistance, the better, in the absence of any other performance hazards, to reduce electromagnetic energy consumption. Membrane resistance is related to membrane structure engineering and membrane thickness, as well as external aqueous solutions and temperature. Generally, it is required to measure membrane conductivity at 25 ℃ in 0.1mol/L KCL aqueous solution or 0.1mol/L NaCL aqueous solution as a relatively standard.

2. Exchange capacity

Exchange capacity is an important main parameter of ion exchange membranes, and its enterprise is mmol/g. Generally, membranes with high exchange capacity should have good permeability and strong conductivity. However, because active functional groups generally have water absorption properties, when the composition of active functional groups is high, the water content and solubilization inside the membrane will increase, thereby endangering the compressive strength of the membrane. Sometimes, due to the excessive looseness of the membrane structure, the selectivity of the membrane may be reduced. The exchange capacity of a general membrane is about 2-3Mmol/g

3. Moisture content

The essential water fused with active functional groups within the membrane, as indicated by the weight of the water content in 1 gram of wet membrane, is related to its exchange capacity and chemical crosslinking degree. As mentioned above, with the increase of exchange capacity, the water content increases. Membranes with high chemical cross-linking degree in ultrapure water equipment will have a corresponding decrease in water content due to membrane structure engineering. Increasing the moisture content of the membrane can enhance its conductivity, but due to its solubilization, it can selectively decrease. Generally, the moisture content of the membrane is around 20% -40%.

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