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A kind of mixture applied to reactive coagulation bath and its application

A reactive and coagulation bath technology, which is applied in the field of polymer microporous membranes, can solve the problems of easy phase separation, lower membrane mechanical properties, and easy agglomeration, etc. It takes a short time to achieve modification, important application prospects, and preparation The effect of simple method

Active Publication Date: 2020-12-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, inorganic nanoparticles have poor dispersion during doping and are prone to agglomeration, which reduces the mechanical properties of the film; hydrophilic prepolymers such as polyethylene glycol (PVP) and polyvinylpyrrolidone (PVP), because they are water-soluble , during the phase inversion process, it is easy to break away from the membrane and enter the water
The water-insoluble additives with polar functional groups, due to their poor hydrophilicity, need to be added in large quantities to achieve good results, but their compatibility with polymer resins is poor, and phase separation is prone to occur after a large amount of addition , which also reduces the mechanical properties of the membrane (please refer to the reference Ting Ma, et al. Journal of Membrane Science, 2013, 444, 293-300)

Method used

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  • A kind of mixture applied to reactive coagulation bath and its application
  • A kind of mixture applied to reactive coagulation bath and its application
  • A kind of mixture applied to reactive coagulation bath and its application

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preparation example Construction

[0025] The present invention provides a kind of preparation method of the polymer microporous membrane that utilizes the above-mentioned mixture that is applied to reactive coagulation bath, it comprises the following steps:

[0026] S1, dissolving the polymer in a second organic solvent to obtain a polymer casting solution;

[0027] S2, preparing the casting solution into a flat plate type or a hollow fiber type to form a nascent film;

[0028] S3, placing the nascent film in a reactive coagulation bath to solidify to obtain a polymer microporous film, wherein the reactive coagulation bath includes a prepolymer, a first organic solvent and water, and the prepolymer is a functional unit Prepolymers and silane coupling agents are prepared by polymerization under the action of initiators. During the phase separation process, the prepolymers in the reactive coagulation bath migrate to the polymer molecular chains of the nascent film and undergo self-crosslinking to achieve Polym...

Embodiment 1

[0041] Step (1) Dissolve 40 g of N-vinylpyrrolidone and 25 g of vinyltriethoxysilane in 1000 g of triethyl phosphate, and pass nitrogen gas at room temperature for 1 hour to remove dissolved oxygen in the solution. 1 g of azobisisobutyronitrile was quickly added at a stirring speed of 400 r / min, and the temperature was raised to 60° C. After 48 hours of reaction, nitrogen flow was stopped, and the solution was exposed to air to terminate the reaction. The solution obtained from the reaction is sealed and stored for use;

[0042] Step (2) Dissolve 180 grams of polyvinylidene fluoride, 10 grams of polyethylene glycol, and 10 grams of polyvinylpyrrolidone in 800 grams of triethyl phosphate, stir at 70 ° C for 12 hours at a speed of 200 r / min, and vacuumize to remove large Part of the air bubbles, then keep warm at 70 ° C for 12 hours to defoam;

[0043] Step (3) After mixing the solution obtained in step (1) with deionized water at a ratio of 3:7, a reactive coagulation bath is ...

Embodiment 2

[0052] Step (1) Dissolve 10 grams of hydroxymethyl methacrylate, 30 grams of N,N-dimethylaminoethyl methacrylate, 30 grams of vinyltrimethoxysilane and 1000 grams of N,N-dimethylformamide In the process, nitrogen gas was passed at room temperature for 30 hours to remove dissolved oxygen in the solution. 1.5 g of dibenzoyl peroxide was quickly added under stirring at 500 r / min, and the temperature was raised to 80° C. After 40 hours of reaction, the nitrogen flow was stopped, and the solution was exposed to the air to terminate the reaction. The solution obtained from the reaction is sealed and stored for use;

[0053] Step (2) Dissolve 200 grams of polylactic acid, 60 grams of polyoxyethylene-polyoxypropylene-polyoxyethylene, and 10 grams of polyoxyethylene in 730 grams of N,N-dimethylformamide, and stir at 60°C for 18 hours , vacuum to remove most air bubbles. Heat preservation and defoaming at 60°C for 16 hours;

[0054] Step (3) After mixing the solution obtained in step...

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Abstract

The invention relates to a mixture applied to reactivity coagulating bath. The mixture comprises a prepolymer, a first organic solvent and water, wherein the prepolymer is obtained through polymerization of a functional monomer and a silane coupling agent under the action of an initiator. The invention further provides a preparation method of a polymer microporous membrane by utilizing the mixtureapplied to reactivity coagulating bath. In specific, a primary membrane is placed in the reactivity coagulating bath for curing to obtain the polymer microporous membrane; during the separating process, the prepolymer in the reactivity coagulating bath is transferred to between polymer molecular chains of the primary membrane and has self-crosslinking to realize functionalization modification ofthe polymer.

Description

technical field [0001] The invention relates to the field of polymer microporous membranes, in particular to a mixture used in reactive coagulation baths and a preparation method for preparing polymer microporous membranes by using the mixture. Background technique [0002] Polymer membrane materials often have low surface free energy and strong hydrophobicity. During their use, they are easily contaminated by organic substances such as proteins and bacteria, resulting in decreased flux and reduced separation efficiency, thereby shortening the service life of the membrane. Therefore, it is very important to enhance the hydrophilicity of polymer microporous membranes, reduce membrane fouling, and increase water flux. [0003] At present, the commonly used modification methods for polymer microporous membranes include surface grafting, surface coating, and physical blending. However, these three modification methods all have certain disadvantages, such as the surface grafting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D67/00
CPCB01D67/0002B01D71/82
Inventor 刘富林海波李田田
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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