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Preparation method of UHMWPE (Ultrahigh Molecular Weight Polyethylene) hollow fiber membrane

A fiber membrane and hollow technology, which is applied in the field of preparation of filtration membranes for water treatment, can solve the problems of membrane filament performance attenuation, pollution resistance, no hydrophilicity, etc., and achieves saving raw material costs, prolonging service life, and pollution resistance. lasting effect

Inactive Publication Date: 2013-09-18
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, UHMWPE resin itself is extremely hydrophobic, and none of the existing technologies mentioned the problem of hydrophilic modification of membrane filaments.
This type of membrane filament may have a relatively high initial flux, but in actual use, due to its lack of hydrophilicity and resistance to pollution, the flux drops rapidly and has no practical value.
Secondly, if the stretched membrane yarn does not adopt a shaping process, the performance of the membrane yarn will not be stable. During the use process, there will be different degrees of shrinkage, which will lead to the gradual attenuation of the membrane yarn performance and make it unusable.
Finally, the internal cavity of the UHMWPE hollow fiber membrane is formed by organic solution, which brings great difficulties to the subsequent solvent recovery and recycling. This kind of technology is not suitable for large-scale promotion in industrial production.

Method used

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  • Preparation method of UHMWPE (Ultrahigh Molecular Weight Polyethylene) hollow fiber membrane
  • Preparation method of UHMWPE (Ultrahigh Molecular Weight Polyethylene) hollow fiber membrane
  • Preparation method of UHMWPE (Ultrahigh Molecular Weight Polyethylene) hollow fiber membrane

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Embodiment 1

[0039] Ultra-high molecular weight polyethylene, select the ultra-high molecular weight polyethylene product of BASF, the model is BS015, the weight average molecular weight is 1500000, the content is 22.5%, the weight average molecular weight of PE-PEO copolymer is 4000, the content is 5%, antioxidant 1076 is 0.5%, and the diluent is white oil. It is mixed and melted in a twin-screw extruder at 200-250°C. The homogeneous polymer melt is metered by a gear pump, extruded from a double-tube spinneret, and passed through Cooling, winding, extraction, stretching, and setting to obtain a hollow fiber membrane, and the flow rate of oil-free and water-free air forming the inner cavity of the fiber is 6ml / min. The stretching temperature is 80°C, the stretching ratio is 1.5 times, and the cooling bath is water at 35°C. The setting temperature is 120°C, and the setting time is 30 minutes. The obtained hollow fiber membrane has an inner and outer diameter of 0.8 / 1.6 mm, a cross-sectiona...

Embodiment 2

[0041] Ultra-high molecular weight polyethylene with a weight-average molecular weight of 1,800,000 and a content of 20.0%, an ethylene-vinyl alcohol copolymer (EVOH) with a weight-average molecular weight of 6,000 and a content of 7%, an antioxidant 1010 of 0.5%, and a diluent of white oil. It is mixed and melted in a twin-screw extruder at 200-250°C. After being metered by a gear pump, the polymer homogeneous melt is extruded from a double-tube spinneret, cooled, coiled, extracted, and then stretched. , stereotyped to obtain a hollow fiber membrane, and the flow rate of oil-free and water-free air forming the inner cavity of the fiber is 6ml / min. The stretching temperature is 90°C, the stretching ratio is 2.0 times, and the cooling bath is water at 35°C. The setting temperature is 120°C, and the setting time is 30 minutes. The inner and outer diameters of the obtained hollow fiber membranes are 0.9 / 1.8mm, the cross-sectional pore structure of the membrane is a sponge-like p...

Embodiment 3

[0043] Ultra-high molecular weight polyethylene, the weight average molecular weight is 1500000, the content is 22.5%, the weight average molecular weight of PE-PEO copolymer is 5000, the content is 5%, the antioxidant 1076 is 0.5%, the diluent is white oil, and it is extruded in twin-screw It is mixed and melted at 200-250°C in the discharge machine. After being metered by a gear pump, the homogeneous polymer melt is extruded from a double-tube spinneret, cooled, wound, extracted, and then stretched and shaped to obtain a hollow Fiber membrane, oil-free and water-free air flow rate of 6ml / min forming the inner cavity of the fiber. The stretching temperature is 80°C, the stretching ratio is 1.5 times, and the cooling bath is water at 35°C. The setting temperature is 120°C, and the setting time is 30 minutes. The inner and outer diameters of the obtained hollow fiber membranes are 0.8 / 1.6mm, the cross-sectional pore structure of the membrane is a sponge-like pore structure, th...

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Abstract

The invention relates to a preparation method of a UHMWPE (Ultrahigh Molecular Weight Polyethylene) hollow fiber membrane. The method comprises the following steps of: based on a developed thermally induced phase method film forming mechanism, mixing and fusing raw materials by adopting a double-screw-rod extruder; metering by a gear pump; extruding by a spinneret plate; and carrying out procedures of cooling, winding, extracting, stretching, sizing and the like to finally prepare the UHMWPE hollow fiber membrane. According to the preparation method disclosed by the invention, high-temperature-resisting amphiphilic copolymers, such as an ethylene-vinyl alcohol copolymer (EVOH), a PE-PEO (Polyethylene-Polyoxyethylene) copolymer, an ethylene-acrylic copolymer (EAA) and an PE-PEG (Polyethylene-Poly Ethylene Glycol) copolymer, are added into the raw materials, so as to realize the permanent hydrophily of a membrane wire; the pollution resistance of the membrane wire is lasting and the service life of the membrane wire is greatly prolonged; and an oil-free and anhydrous air flow is adopted to form an inner cavity of the membrane wire, so that the problems that the recycling load of a solvent is great and the consumed amount of the solvent is great in a production process of the UHMWPE hollow fiber membrane by a thermally induced phase method are solved.

Description

【Technical field】 [0001] The invention relates to a method for preparing a filter membrane for water treatment, in particular to a method for preparing an ultrahigh molecular weight polyethylene hollow fiber membrane. 【Background technique】 [0002] Ultra-high molecular weight polyethylene: the English name is Ultra-high Molecular Weight Polyethylene (UHMWPE for short), which is polyethylene with a molecular weight of more than 1 million. The heat distortion temperature is 85°C, and the melting point is 130-136°C. It is a thermoplastic engineering plastic with a linear structure and excellent comprehensive properties. Although UHMWPE belongs to the polyethylene family, its linear molecular chain is ten times longer than conventional high-density polyethylene. This unique structure makes it have ideal material comprehensive properties, in addition to heat resistance, wear resistance, low temperature resistance, chemical corrosion resistance, self-lubrication, stress crack r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00B01D71/26
Inventor 陈亦力彭文娟李锁定李岩赵福生
Owner BEIJING ORIGIN WATER FILM TECH
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