T/CIPR 067-2022 Abolished Group standards

T/CIPR 067-2022 High-flux enhanced PVDF without backing ultrafiltration membrane

Publish Date: 2022-06-03 Implement Date: 2022-07-03 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CIPR 067-2022

Standard Type: Group standards

Standard Status: Abolished

is_force_gb: no

CCS Name: -

ICS Name: Films and sheets

Publish Date: 2022-06-03

Implement Date: 2022-07-03

Scope

Main technical content: This technology uses hydrophilic agents, additives, and dopamine-modified polyvinylidene fluoride to blend and modify under polar solvents, reducing the surface tension of the membrane surface and the inner wall of the membrane pores, improving the hydrophilicity of polyvinylidene fluoride. At the same time, the dopamine in dopamine-modified polyvinylidene fluoride contains catechol groups and amino groups, which are prone to self-aggregation under the oxidation of dissolved oxygen and form a firmly adhered dopamine composite layer on the surface of polyvinylidene fluoride. The interaction force between the dopamine composite layer and polyvinylidene fluoride is between covalent bonds and non-covalent bonds, with strong stability and durability. Then, the hydrophilic agent includes triethanolamine. Triethanolamine not only contains rich hydrophilic groups, but also its nitrogen atom has extremely high electronegativity, with a strong lone pair of electrons. It can form hydrogen bonds with the polar bonds in the additives and the dopamine composite layer, attracting each other. This can overcome the problem of decreased hydrophilicity of PVDF membranes caused by the loss of hydrophilic additives after use, thus maintaining long-term hydrophilicity, improving the anti-pollution of PVDF membranes, and maintaining a high operating flux for a long time. At a pressure of 0.1 MPa and a temperature of 25°C, the pure water flux is 400-600 L/m2·h, with a filtration accuracy of 0.01 μm. Moreover, a hydrogel layer forms on the membrane surface during operation. Most pollutants (especially the extracellular polymer, which contributes the most to membrane pollution) are not easily adhered to the hydrogel layer. Even if a sludge cake forms, it is loose and easy to be shaken off or flushed off. In addition, triethanolamine can coordinate with calcium, magnesium, and iron ions, and has excellent removal effect on metal ions in wastewater. Moreover, the small-