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Polyvinyl chloride hollow fiber porous membrane preparation method

A polyvinyl chloride and porous membrane technology, applied in the manufacture of hollow filaments, fiber chemical characteristics, chemical instruments and methods, etc., can solve problems such as complex recovery of diluents and extractants, reduced uniformity of membrane filaments, and high control requirements , to achieve the effect of improving melt flow properties, easy tensile deformation, and uniform three-dimensional network pore structure

Pending Publication Date: 2018-09-21
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

The general immersion precipitation phase inversion method needs to use a large amount of solvent in the preparation process of the membrane, which will cause problems such as high cost and environmental pollution, and the strength of the membrane prepared by this method is low; the thermally induced phase separation method is suitable for spinning The control requirements of the silk process are relatively high, and a large amount of diluent is required, and the recovery of diluent and extractant is more complicated
Literature Desalination and Water Treatment, 2013, 51, 3786-3793; Journal of Membrane Science, 2014, 472, 210-221 uses dioctyl phthalate (DOP) as plasticizer, adopts twin-screw extrusion plasticized spinning method Preparation of polyvinyl chloride hollow fiber membrane, when DOP is not extracted, the polyvinyl chloride membrane has a certain flexibility, and the compressive performance of the membrane is poor during use, while in the process of DOP extraction, the small molecules embedded between the polyvinyl chloride macromolecular segments The extraction of DOP changes the aggregate structure of polyvinyl chloride macromolecules, making the membrane filaments show obvious shrinkage macroscopically, and the uniformity of the membrane filaments is reduced.

Method used

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  • Polyvinyl chloride hollow fiber porous membrane preparation method
  • Polyvinyl chloride hollow fiber porous membrane preparation method
  • Polyvinyl chloride hollow fiber porous membrane preparation method

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preparation example Construction

[0023] The invention provides a kind of preparation method (abbreviation method) of polyvinyl chloride hollow fiber porous membrane, it is characterized in that the concrete steps of this method are as follows:

[0024] (1) Preparation formula: It is prepared by mixing polyvinyl chloride, water-soluble ester solvent, composite porogen and auxiliary additives uniformly, and its mass fraction is composed of:

[0025] Polyvinyl chloride: 20-35%;

[0026] Water-soluble ester solvent: 8-25%;

[0027] Composite porogen: 35-60%;

[0028] Auxiliary additives: 2-5%, the sum of each component is equal to 100%;

[0029] The water-soluble ester solvent is at least one of 1,4-butyrolactone or triethyl phosphate; the water-soluble ester solvent plays a plasticizing role in the stretching process of the film, and because it is a water-soluble solvent, It can be washed with water without shrinking the surface pores of the membrane.

[0030] The composite porogen includes a water-soluble p...

Embodiment 1

[0036] The polyvinyl chloride that is 31% by mass percentage, the 1,4-butyrolactone that is 11% by mass percentage, the epoxy soybean oil that is 5% by mass percentage and the composite porogen that 53% by mass percentage are mixed uniformly, the above-mentioned The blend was fed into a twin-screw extruder, and extruded through a hollow spinneret at a temperature of 155° C., and nitrogen gas was passed into the hollow spinneret. The extruded melt enters a 4cm air bath, a 25°C coagulation bath, and then the first winding, and a 1.5-fold stretching treatment in a 80°C water bath, and then heat-set for 60 minutes in a 50°C water bath , and finally continue to extract and wash in water for 48 hours to obtain a polyvinyl chloride hollow fiber porous membrane.

[0037] It was determined that at 0.1MPa and 25°C, the water flux of the obtained polyvinyl chloride hollow fiber porous membrane was 214.5L / m 2 h, the tensile strength is 15.1MPa, the average pore diameter is 0.446μm, and t...

Embodiment 2

[0039]The membrane-making process conditions in Example 1 were changed to: three-fold stretching treatment was performed in a water bath at 80° C., and other conditions remained unchanged to prepare the polyvinyl chloride hollow fiber porous membrane.

[0040] It was determined that at 0.1MPa and 25°C, the water flux of the obtained polyvinyl chloride hollow fiber porous membrane was 305.9L / m 2 h, the tensile strength is 23.9 MPa, the average pore diameter is 0.556 μm, and the porosity is 58.19%.

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Abstract

The invention discloses a polyvinyl chloride hollow fiber porous membrane preparation method. The method particularly comprises the following steps that 1, a formula is prepared, wherein 20-35% by mass of polyvinyl chloride, 8-25% by mass of water soluble ester solvent, 35-60% by mass of composite pore-foaming agent and 2-5% by mass of auxiliary additives are mixed uniformly to obtain the formula,wherein the sum of all ingredients is equal to 100%; 2, the formula is mixed to be uniform, then melt spinning is conducted by adopting a twin-screw extruder at 150-170 DEG C, after extrusion is conducted through a hollow spinning pack, winding is conducted through air bath and normal temperature coagulating bath in sequence, 1.5-4-time online stretching is conducted in a stretching water tank of60-80 DEG C, fixed-length heat setting is conducted for 40-90 min in water bath of 40-60 DEG C, and finally extraction washing is conducted with water to obtain a polyvinyl chloride hollow fiber porous membrane. The prepared polyvinyl chloride hollow fiber porous membrane has the uniform three-dimensional grid hole structure, and has good pressure resistance and mechanical property.

Description

technical field [0001] The invention relates to a preparation method of a hollow fiber membrane, in particular to a preparation method of a polyvinyl chloride hollow fiber porous membrane. Background technique [0002] Membrane separation technology has shown great application prospects due to its characteristics of high efficiency, energy saving, easy operation, small footprint, strong processing capacity and no pollution. [0003] Polyvinyl chloride (PVC) has become an excellent membrane material because of its superior mechanical properties, stable chemical properties, low cost, acid and alkali resistance, and solvent resistance, and is widely used in the preparation of separation membranes. For example, application number 02136109.6 discloses a preparation method of large flux polyvinyl chloride hollow fiber membrane, using 1-methyl-2-pyrrolidone as solvent and polyethylene glycol as additive by dry-wet spinning method to obtain High-throughput polyvinyl chloride hollow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D67/00B01D69/12B01D69/08D01F1/08D01F6/48D01F1/10
CPCB01D69/08B01D69/085B01D69/125B01D71/30D01F1/08D01F1/10D01F6/48
Inventor 刘海亮鲁方肖长发黄庆林
Owner TIANJIN POLYTECHNIC UNIV
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