A kind of preparation method of pvc hollow fiber membrane with bacteriostasis

Abstract

The invention provides a preparation method of a PVC (polyvinyl chloride) hollow fiber film with antibacterial performance. The preparation method comprises the following steps: under an ultrasonic condition, dissolving and dispersing silver nanoparticles in a solvent for dissolving polyvinyl chloride; adding polyvinyl chloride, a pore-forming agent and Tween-80 into a spinning pot with a solvent and stirring under a sealing condition; vacuumizing, standing and defoaming; filtering out impurities to obtain a film casting solution; injecting the film casting solution into a spinneret by a metering pump and simultaneously introducing polyester yarn threads into the spinneret by traction, allowing the polyester yarn threads to flow out together with the film casting solution, and evenly applying the film casting liquid to the outer surfaces of the polyester yarn threads of a support layer; and performing a phase inversion process in a coagulating bath, thereby obtaining the reinforced hollow fiber film with antibacterial performance. The hollow fiber film has the characteristics of bacteria inhibiting capability, high strength, high flux and low price.

Description

technical field [0001] The invention relates to a preparation method of a high-strength PVC hollow fiber membrane, in particular to a preparation method of a high-strength PVC hollow fiber membrane with antibacterial properties. Background technique [0002] Membrane separation technology is one of the technologies with the greatest development potential in the field of water treatment. The surface of the membrane has micron or nanoscale pore size, and the pore size is used to intercept suspended solids, organic pollutants, bacteria, viruses, etc. in water. At present, the membrane method for sewage treatment has been more and more widely used in China. The separation membrane is divided into plate and frame type, tube type, coil type and hollow fiber type according to the form of membrane modules. Among them, the hollow fiber membrane module can greatly increase the filtration area per unit volume of the membrane module, and is more widely used. [0003] However, hollow fi...

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Problems solved by technology

One of the problems currently faced by this type of membrane module is the biofouling of the membrane, because during the filtration process of the membrane, microorganisms in the water will attach and grow on the surface of the membrane material, resulting in blockage of the membrane pore size

At present, general organic membrane materials only have the function of retaining bacteria but have no antibacterial or bactericidal properties; the second problem faced by hollow fiber membranes is the poor strength of the membranes. The diameter of commonly used hollow fiber membranes is generally within a few millimeters. , continuous water disturbance and air-water scour will easily lead to membrane filament breakage, which will cause the membrane to lose its retention capacity and improve the strength of the membrane, which is an important guarantee to ensure that the membrane filament does not break; the third problem of the hollow fiber membrane is The cost is still high, which makes membrane separation technology still an "expensive" technology or an "unaffordable" technology. Finding cheap membrane materials is one of the ways to solve this problem. The materials currently available for membrane Including polyvinylidene fluoride (PVDF) film, polyethylene (PE) film, polypropylene (PP) film, polyvinyl chloride (PVC) film, polyacrylonitrile (PAN) film, etc. Among them, PVC film has chemical stability, The advantage of low price, but at present, PVC film still has the disadvantages of poor anti-biological pollution ability and poor strength.

[0004] In the existing hollow fiber membrane preparation method, the patent document with the publication number CN101623604A discloses that thermoplastic polyurethane, fluororubber, iron salt, polyethylene glycol, aluminum chloride, etc. are used as additives to modify polyvinyl chloride hollow fiber A membrane material with better performance can be obtained, but this method uses more additive components, the preparation process is complicated, and the water flux of the membrane will decrease with the loss of additives.

The patent document whose publication number is CN100562356C discloses that nano-silica or aluminum powder is used to modify polyvinyl chloride hollow fiber membranes to obtain a membrane with good hydrophilicity, but the strength of the membrane filaments obtained by this method is relatively poor , prone to fracture and damage during backwashing and other processes

The patent documents of U.S. Patent US7909177B2 and Chinese Patent CN1864828A both disclose a method for preparing a mesh fiber-reinforced hollow fiber membrane. susceptible to biofouling, thereby reducing the flux of the membrane

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