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Separation membrane support, method for producing same, separation membrane and fluid separation element using separation membrane support

A manufacturing method and a technology for a support body, which can be used in household components, chemical instruments and methods, semi-permeable membrane separation, etc., can solve problems such as peeling, and achieve the effects of excellent film-making properties, excellent mechanical strength, and excellent processability.

Active Publication Date: 2018-08-24
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 producing same, separation membrane and fluid separation element using separation membrane support
  • Separation membrane support, method for producing same, separation membrane and fluid separation element using separation membrane support
  • Separation membrane support, method for producing same, separation membrane and fluid separation element using separation membrane support

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

The present invention provides a separation membrane support made of non-woven fabric, which has high yield and excellent stability when supporting separation membranes such as various microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, and reverse osmosis membranes. Excellent film-forming properties, excellent processability in the manufacture of fluid separation elements, and excellent mechanical strength. Also provided are a separation membrane and a fluid separation element using the separation membrane support having high membrane peel strength. The separation membrane support is made of nonwoven fabric. In the longitudinal direction (longitudinal direction) of the nonwoven fabric, the boiling water shrinkage after boiling water treatment for 5 minutes is -0.2 to 2.0%. The separation membrane is obtained by forming a membrane having a separation function on the surface of the separation membrane support. The fluid separation element includes this separation membrane as a constituent element.

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 Patents(China)
IPC IPC(8): B01D69/10B01D69/12B01D71/48B32B27/12D04H3/011D04H3/16
CPCD04H3/011D04H3/16B32B5/26B32B2262/0284D04H1/435D04H1/54D04H1/55B01D2323/42Y10T442/681Y10T442/696B29K2267/003B29L2031/755B01D69/10B01D69/1071B01D71/68B29C66/7294
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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