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Hollow fiber film and method for producing the same

A manufacturing method and technology of fiber membranes, applied in the field of preparation of hollow fiber membranes, can solve problems such as unsatisfactory shape recovery, difficulty in forming holes in fiber membranes, and high energy consumption, etc., and achieve easy operation, good product quality, and membrane-making technically simple effect

Inactive Publication Date: 2008-12-17
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology consumes a large amount of solvent, which is easy to pollute the environment, and the mechanical properties of the obtained fiber membrane and the shape recovery during the pressure response process are not ideal.
Conventional melting or melt spinning methods do not require solvents, and the process flow is short, but the structure of the obtained fiber membrane is usually relatively dense, difficult to form holes, and the pore size is difficult to control; especially its high spinning temperature consumes more energy. There are many, and the thermal stability requirements for polymers and porogens are also relatively strict. Therefore, reducing the temperature of melt spinning to save energy, controlling the precision and structure of membrane pores, and improving product performance are the advantages of melt spinning. , and the key technology to make it suitable for spinning hollow fibers

Method used

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  • Hollow fiber film and method for producing the same
  • Hollow fiber film and method for producing the same
  • Hollow fiber film and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The fiber-grade polyether polyurethane with a mass ratio of hard segment / soft segment of 1 / 2 is used as the polymer matrix phase, and the mass percentage is 25%; the composite porogen is 0.01 μm SiO 2 The mixture of powder and PVP accounts for 60% of the total mass of the system, of which the former is an interface pore-forming agent, accounting for 30% of the total mass of the composite porogen, and the latter is a non-interface pore-forming agent, accounting for 30% of the total mass of the composite porogen. 70% of the total mass; DMSO is selected as the organic low-molecular liquid, and the mass percentage is 15%. The mixture of the above three is used as a film-forming system, which is heated and forced to pre-mix in a mixing tank at a heating temperature of 130 ° C. After dissolution and melting After waiting for the process, it is fed into the twin-screw extruder, and the hollow spinneret is used for melt blending and spinning to form a film. The draw ratio of the...

Embodiment 2

[0034] The proportioning of the interface hole porogen in Example 1 is adjusted to 10% of the total mass of the porogen, the proportioning of the non-interface hole porogen is adjusted to 90% of the total mass of the porogen, and the spinneret draw ratio Option 3, other conditions remain unchanged, to obtain the hollow membrane.

[0035] After inspection, the hollow membrane obtained in this example was measured at 0.1MPa and at a temperature of 25°C, and the water flux was measured by the internal pressure method, and the corresponding value obtained was: 1090 (L·m -2 h -1 ).

Embodiment 3

[0037] The fiber-grade polyether polyurethane with a mass ratio of hard segment / soft segment of 1 / 2 is used as the polymer matrix phase, and the mass percentage is 45%; the composite porogen is 0.01 μm SiO 2 Powder, 5μm CaCO 3 The mixture of powder and PEG accounts for 60% of the total mass of the system, of which the former two are interfacial porogens with a mass ratio of 1 / 1, accounting for 30% of the total mass of the composite porogen, and the latter is a non- The interface pore porogen accounts for 70% of the total mass of the composite porogen; the organic low-molecular liquid is DMSO, and the mass percentage is 20%. The mixture of the above three is used as a film-forming system, which is heated and forced to pre- After mixing, dissolving and melting, it is fed into the twin-screw extruder, and the hollow spinneret is used for melt blending and spinning to form a film. The draw ratio of the spinneret is selected as 3, and the processing temperature is controlled at 155...

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Abstract

The invention relates to a hollow fiber membrane and a manufacturing method thereof. The weight percentage prescription of the membrane forming system of the membrane is: 25 to 45 percent of polyurethane; 35 to 60 percent of compound pore-forming agent; 15 to 20 percent of organic low molecular; the sum of each component is 100 percent; wherein, the polyurethane is a fiber grade; the weight ratio of a hard section and a soft section is 1 / 1 to 1 / 5; the compound pore-forming agent is the mixture of an interface cavity pore-forming agent and a non-interface cavity pore-forming agent; the organic low molecular liquid is a good water-soluble polyurethane solvent with a high boiling point; the manufacturing method of the membrane adopts the following melt spinning technique: firstly the prescription of the invention demands the preparation of a polymer membrane forming system; then the polymer membrane forming system is poured into a mixing tank to carry out heating, reinforcing and pre-mixing with a heating temperature of 130 to 140 DEG C; the polymer membrane forming system is injected into a double screw extruder after being uniformly mixed; melt blending spinning is carried out to manufacture the membrane under the temperature of 130 to 155 DEG C; then the hollow fiber membrane is obtained after the normal working procedure of water extraction washing.

Description

technical field [0001] The invention relates to a preparation technology of a hollow fiber membrane, specifically a hollow fiber membrane with good elastic function and a manufacturing method thereof. The International Patent Main Classification No. is intended to be Int. Background technique [0002] Polyurethane (polyurethane) is a kind of block copolymer formed by alternating connection of soft and hard segments. Excellent resilience, and the hard segment provides nodes for the elongation deformation and rebound of the soft segment. The unique chemical structure of polyurethane makes it have many properties such as high elasticity, high strength, heat resistance, wear resistance, and chemical resistance, and has been widely used in industries such as automobiles, shoemaking, and wires and cables. In 1970, Bowen proposed that polyurethane could be used as a selective adsorbent for certain substances. Since then, the application of polyurethane in membrane materials has gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D69/08
CPCB01D69/08B01D71/54B01D2323/18
Inventor 肖长发胡晓宇梁海先安树林
Owner TIANJIN POLYTECHNIC UNIV
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