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Separation membrane support, method for manufacturing same, separation membrane using separation membrane support, and fluid separation device

A manufacturing method and technology for separation membranes, which are used in household components, chemical instruments and methods, semi-permeable membrane separation, etc., can solve problems such as peeling, and achieve excellent film-making properties, excellent processability, and small dimensional changes.

Active Publication Date: 2014-11-05
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, although the latter operation is usually the case, in this case, the reverse osmosis composite membrane will repeatedly expand and contract in the thickness direction of the reverse osmosis composite membrane due to fluctuations in the operating pressure applied to the thickness direction of the reverse osmosis composite membrane. , sometimes the support layer and support body of the reverse osmosis composite membrane will be peeled off

Method used

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  • Separation membrane support, method for manufacturing same, separation membrane using separation membrane support, and fluid separation device
  • Separation membrane support, method for manufacturing same, separation membrane using separation membrane support, and fluid separation device
  • Separation membrane support, method for manufacturing same, separation membrane using separation membrane support, and fluid separation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145] (core ingredient)

[0146] A polyethylene terephthalate resin having an intrinsic viscosity IV of 0.65, a melting point of 260° C., a titanium oxide content of 0.3% by mass, and dried to a moisture content of 10 ppm was used as a core component.

[0147] (sheath component)

[0148] A copolymerized polyethylene terephthalate resin having an intrinsic viscosity IV of 0.66, a copolymerization ratio of isophthalic acid of 11 mol%, a melting point of 230°C, a titanium oxide content of 0.2% by mass, and dried to a moisture content of 10 ppm was used as the sheath Element.

[0149] (Spinning and web capture)

[0150] The core component and the sheath component were melted at 295° C. and 270° C. respectively, and composited into a concentric core-sheath type (circular cross-section) with a die temperature of 300° C. and a core / sheath mass ratio of 80 / 20. The fine holes are spun out, and then spun through the ejector at a spinning speed of 4400m / min, and collected in the form...

Embodiment 2

[0159] In the lamination thermocompression bonding, except that the speed ratio to the three flat rolls and the cooling roll was 1.02, a film with a basis weight of 76 g / m was manufactured in the same manner as in Example 1. 2 , a thickness of 0.09 mm, a boiling water shrinkage rate of 1.0% in the longitudinal direction, a water absorption time of 60 seconds or more, and a spun-bonded nonwoven fabric with a Becker smoothness of 14 seconds on the back to obtain a separation membrane support, and the separation membrane support A polysulfone membrane was produced in the same manner as in Example 1. At this time, the backside penetration of the casting liquid was not seen at all, and the length of the separation membrane formed / the length of the support rolled out was 0.995, and the membrane peel strength of the produced separation membrane was 44 cN / 15 mm. The results are shown in Table 1 and Table 2.

Embodiment 3

[0161] In the lamination thermocompression bonding, except that the surface temperature of the cooling roll was 90° C., and the speed ratio of the cooling roll to the three flat rolls was 1.02, it was produced in the same manner as in Example 1. m 2 , a thickness of 0.09 mm, a boiling water shrinkage rate of 1.8% in the longitudinal direction, a water absorption time of 60 seconds or more, and a spun-bonded nonwoven fabric with a Becker smoothness of 13 seconds on the back side to obtain a separation membrane support, on which the separation membrane support A polysulfone membrane was produced in the same manner as in Example 1 above. At this time, the backside penetration of the casting liquid was not seen at all, and the length of the separation membrane formed / the length of the support rolled out was 0.992, and the membrane peel strength of the produced separation membrane was 36 cN / 15 mm. The results are shown in Table 1 and Table 2.

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Abstract

Provided is a separation membrane support formed of a non-woven fabric that has a high yield ratio and stable and excellent film-forming properties when supporting separation membranes such as various microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, and reverse osmosis membranes, excellent processing properties when manufacturing a fluid separation membrane, and excellent mechanical strength. Also provided is a separation membrane that uses the separation membrane support to have high film peel strength, and a fluid separation membrane. The separation membrane support is formed of the non-woven fabric. The non-woven fabric has a boiling water shrinkage of between -0.2% and 2.0% in a length (longitudinal) direction after processing in boiling water for five minutes. The separation membrane is formed by forming a membrane which has a separation function on a surface of the separation membrane support. The fluid separation device includes the separation membrane as a component thereof.

Description

technical field [0001] The present invention relates to a separation membrane support made of nonwoven fabric for supporting (supporting) separation membranes such as microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, and reverse osmosis membranes, and a method for producing the same. Furthermore, the present invention relates to a separation membrane and a fluid separation element using the separation membrane support. Background technique [0002] In recent years membrane technology has been used in many cases for water treatment. For example, microfiltration membranes and ultrafiltration membranes have been used for water treatment in water purification plants, and reverse osmosis membranes have been used for desalination of seawater. In addition, reverse osmosis membranes and nanofiltration membranes have been used for the treatment of semiconductor manufacturing water, water heater water, medical water, pure water for testing, and the like....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D71/48B32B27/12D04H3/011D04H3/16
CPCD04H3/16B32B27/12D04H3/011B01D69/10B32B5/26B32B2262/0284D04H1/435D04H1/54D04H1/55B01D2323/42Y10T442/681Y10T442/696B29K2267/003B29L2031/755B01D69/1071B01D69/1213B01D71/48B01D71/68B29C66/7294
Inventor 羽根亮一东雅树山崎仁松浦博幸矢掛善和
Owner TORAY IND INC
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