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.

A Conductivity

Conductivity (membrane resistance) is generally indicated by conductivity (Ω -1. cm-1) or electrical resistivity (Ω. cm). It is also common for membrane surface resistance, which is the resistance per unit of total membrane area (Ω. cm2), to indicate the main purpose of resistance in medical settings. 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, a temperature of 25 ° C is required, and membrane conductivity measured in 0.1mol/L KCL aqueous solution or 0.1mol/L NaCL aqueous solution is considered a more standardized measure.

B Water content

The water content refers to the essential water fused with active functional groups within the membrane of RO-EDI ultra pure water equipment. The weight of the water content in 1 gram of wet membrane indicates that the water content is related to its exchange capacity and chemical cross-linking 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%.

C 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.

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