Method for preparing hydrophilic anti-pollution reverse osmosis membrane

A reverse osmosis membrane, anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of polyamide membrane without chemical bonding, PVA cross-linked membrane instability, etc., to achieve anti-pollution performance Effect of improving and improving hydrophilicity and prolonging service life

Active Publication Date: 2009-05-27
NINGBO HIDROTEK CO LTD
3 Cites 23 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] Another example is that the application number is 200610051205.8 in China's invention application publication "The Production Method of Low-Pollution Composite Reverse Osmosis Membrane" (publication number: CN1923348A), which discloses a method of cross-linking PVA with po...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

The invention discloses a preparation method of a hydrophilic pollution-resistant reverse osmosis membrane which is characterized in that a daiamid layer is compounded on a supporting layer by an interface polyreaction at first; then reaction occurs on the daiamid layer to generate a crosslinking layer by the surface grafting reaction. Compared with the prior art, the preparation method has the advantages that N-hydroxy thio succinimide sodium salt or N-hydroxy thio succinimide is adopted as the active ester of a midbody for grafting a -(CH2CH2O)n- macromolecular hydrophilic chain on a polyamide cortex; moreover, the -(CH2CH2O)n- is combined with the polyamide membrane of a base by a chemical bond, thus improving the hydrophilicity of a compound reverse osmosis membrane, increasing the water flux thereof and improving the pollution resistance thereof, thereby prolonging the service life of the membrane.

Application Domain

Semi-permeable membranes

Technology Topic

ChemistryPolyamide +9

Examples

  • Experimental program(5)

Example Embodiment

[0025] The preparation method of hydrophilic anti-pollution reverse osmosis membrane is characterized by comprising the following steps:
[0026] ①Interfacial polymerization reaction: Coating solution A on the support layer to form a solution A layer on the surface, and interfacial polymerization reaction between the support layer with solution A layer and solution B to form a polyamide composite layer;
[0027] ②Surface grafting reaction, the polyamide composite layer in step ① is treated in an acid solution with a pH of 1 to 3, taken out and rinsed, and then treated with C solution and D solution in sequence to complete the surface grafting reaction, the acid solution It is one of hydrochloric acid, sulfuric acid or phosphoric acid,
[0028] The configuration of the A solution: dissolve in water with at least one functional amine selected from aromatic, aliphatic and cycloaliphatic, the functional amine has at least two amine functional groups, and its weight concentration in the aqueous solution It can be 0.1% to 5%. After the above-mentioned polyfunctional amine is completely dissolved in water, a surfactant that can account for 0.05% to 2% of the total weight of the aqueous solution is added to the aqueous solution, and solution A is obtained after stirring and dissolving;
[0029] The preparation of the B solution: one selected from aromatic, aliphatic and alicyclic functional acyl halide, the functional acyl halide has at least two acyl halide functional groups, according to the weight of the total solution Dissolve in an organic solvent at a concentration of 0.05% to 0.2%, and obtain solution B after stirring and dissolving;
[0030] The preparation of the C solution: dissolve at least one of N-hydroxysulfosuccinimide sodium salt or N-hydroxysulfosuccinimide in water to prepare a solution with a weight concentration of 0.1% to 5% , And then add 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to the above solution to prepare a solution with a weight concentration of 0.05% to 2.5% to obtain a solution C;
[0031] The formulation of the D solution: at least one of polyethylene glycol, amino polyethylene glycol, and polyvinyl alcohol is formulated into a solution with a weight concentration of 0.05% to 4.0% to obtain a D solution.

Example Embodiment

[0032] Embodiment 1, the production method of reverse osmosis membrane includes the following steps:
[0033] The preparation of the A solution: use m-phenylenediamine: sodium lauryl sulfate: water according to the weight percentage of 2.5:0.5:97, and mix well to obtain the A solution.
[0034] The preparation of B solution: The weight ratio of trimesoyl chloride: naphtha is 1:1000, mixed to obtain B solution.
[0035] The preparation of C solution: The N-hydroxysulfosuccinimide sodium salt (Na-NHS): 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl ): Pure water, mixed evenly according to the weight percentage 1.8:1:97.2.
[0036] Preparation of solution D: dissolve polyethylene glycol (PEG) with an average molecular weight of 200 (n=200) in water to prepare a solution with a weight concentration of 1%.
[0037] Coat solution A on the polysulfone support layer to form a solution A layer on the support layer, and then contact this support layer with solution B to form a polyamide composite skin layer through interfacial polymerization; the membrane is subjected to a pH=3 hydrochloric acid solution Treat for 2 minutes, take it out and rinse with clear water, pass through C solution for 20 minutes, D solution for 15 minutes, rinse with clear water, and place it in an oven at 120°C for 5 minutes to form the final composite reverse osmosis membrane.
[0038] The measured contact angle was 26.9°, and the hydrophilicity was good.

Example Embodiment

[0039] Embodiment 2, the production method of reverse osmosis membrane includes the following steps:
[0040]The preparation of the A solution: use m-phenylenediamine: p-phenylenediamine: sodium dodecylbenzene sulfonate: water at a weight percentage of 2.0:0.5:0.5:97, and mix well to obtain a solution A.
[0041] The preparation of B solution: the same as in Example 1.
[0042] Preparation of C solution: Preparation of C solution: N-hydroxysulfosuccinimide sodium salt (Na-NHS): 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride Salt (EDC·HCl): pure water, mixed evenly according to the weight percentage of 2.5:1.0:96.5.
[0043] Preparation of solution D: dissolve polyethylene glycol (PEG) with an average molecular weight of 800 (n=800) in water to prepare a solution with a weight concentration of 1%.
[0044] In the remaining steps, except that the treatment time by D solution is 20 minutes, the others are the same as in Example 1.
[0045] The contact angle was measured to be 21.6°, and the hydrophilicity was good.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

Tablet containing everolimus and preparation method thereof

ActiveCN103099790AImprove hydrophilicityImprove securityOrganic active ingredientsPill deliveryChemistryEverolimus
Owner:SHANDONG NEWTIME PHARMA

Manufacturing method of hydrophilic polyester short fibers for directly spinning spun-laced non-woven fabric

ActiveCN104328531AImprove quality uniformityImprove hydrophilicityFibre typesMelt spinning methodsPolyesterChemistry
Owner:JIANGSU JIANGNAN HIGH POLYMER FIBER

Method for coating biomimetic mineralized assembled super-hydrophilic organic-inorganic hybrid membrane

ActiveCN104307379AImprove hydrophilicitySemi-permeable membranesPervaporationIon
Owner:BEIJING UNIV OF TECH

Method for synthesizing hydrophile amino silicon oil

InactiveCN101503515AImprove hydrophilicityImprove washabilityFibre treatmentSiloxaneAminal
Owner:深圳天鼎新材料有限公司

Permeability-improving anti-fog glass and preparation method for same

ActiveCN103570248AImprove hydrophilicityImprove mechanical propertiesTransmittanceRefractive index
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Classification and recommendation of technical efficacy words

  • Increase water flux
  • Improve hydrophilicity

Compositions and methods for enhancing transport through mucus

InactiveUS20100215580A1Reduce mucoadhesivenessImprove hydrophilicityBiocidePowder deliveryChemistryRespiratory mucus
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2023 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap