一种具有多孔通道的超滤膜
By designing a seven-stage porous channel structure and matching materials, the problems of existing ultrafiltration membranes, such as simple pore structure, insufficient antifouling performance, weak mechanical properties, and poor temperature adaptability, have been solved. This has resulted in an ultrafiltration membrane with high efficiency separation and stable performance, suitable for the efficient separation of complex systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN ZHONGYIN ENVIRONMENTAL PROTECTION EQUIP MFG CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-17
AI Technical Summary
Existing ultrafiltration membranes suffer from limited pore structure design, insufficient antifouling performance, weak mechanical properties, poor temperature adaptability, and limited selective separation capabilities. This makes it difficult to balance filtration resistance and separation efficiency, resulting in high flux attenuation rates and making it difficult to meet the high-efficiency separation requirements of complex systems.
It adopts a seven-level porous channel structure, including a reinforcing support substrate layer, a gradient pore transition layer, a primary separation porous layer, a mesoporous buffer layer, a secondary separation porous layer, a surface functional modification layer, and a nanoporous protective layer. It forms an integrated structure through a gradient infiltration-covalent crosslinking process, and the material matching of each layer is optimized.
It achieves efficient staged filtration, maintains high separation accuracy and high throughput, ensures stable membrane performance over a wide pH and temperature range, improves antifouling performance, extends service life, and broadens the range of applications.
Smart Images
Figure CN224506773U_ABST
Abstract
Claims
1. An ultrafiltration membrane having a porous channel, characterized by, From top to bottom, they include: The structure consists of a reinforced support substrate layer, a gradient pore transition layer, a primary separation porous layer, a mesoporous buffer layer, a secondary separation porous layer, a surface functional modification layer, and a nanoporous protective layer. The layers are formed into an integrated structure through a gradient permeation-covalent crosslinking process.
2. The ultrafiltration membrane according to claim 1, characterized in that, The reinforced support base layer adopts a three-dimensional woven structure with a thickness of 200-250μm.
3. The ultrafiltration membrane according to claim 1, characterized in that, The gradient pore transition layer is composed of polyetheretherketone and nano-zirconia. The pores are distributed in a continuous gradient, decreasing linearly from 10-15 μm on one side near the support layer to 1-2 μm on the other side. The inner wall of the pores is distributed with secondary pits with a diameter of 300-600 nm, and the porosity gradually decreases from 70% to 50%.
4. The ultrafiltration membrane according to claim 1, characterized in that, The primary separation porous layer is a composite material of sulfonated polyether sulfone and carbon nanotube-graphene composite nanosheets, containing a spiral main channel with a diameter of 600-900 nm and branch channels with a diameter of 150-250 nm.
5. The ultrafiltration membrane according to claim 1, characterized in that, The mesoporous buffer layer is composed of polyimide and UiO-66-NH2 to form a three-dimensional network mesoporous structure with a pore size of 60-120 nm.
6. The ultrafiltration membrane according to claim 1, characterized in that, The secondary separation porous layer is composed of polyvinylidene fluoride-hexafluoropropylene copolymer and rod-shaped zinc oxide. The pores have a honeycomb array structure with a main pore diameter of 30-60 nm. The pores are connected by interconnecting pores with a diameter of 8-12 nm, and the pore density is 2×10⁻⁶. 6 -5×10 6 The number of cells per mm² is 58%-65%.
7. The ultrafiltration membrane according to claim 1, characterized in that, The surface functional modification layer is a composite coating of dopamine-modified graphene oxide and nano-silver, forming a porous network structure with a diameter of 3-10 nm and a water contact angle of 20°-30°.
8. The ultrafiltration membrane according to claim 1, characterized in that, The nanoporous protective layer is composed of polyethylene glycol-modified polyamide-amine dendritic macromolecules, with a thickness of 2-5 μm and protective pores with a diameter of 1-5 nm distributed on its surface.