Composite film substrate and composite film using same

A technology for composite membranes and supports, applied in the field of composite membranes and methods, separation membranes and separation membrane elements using the composite membrane support, can solve the problems of uneven area weight, inhomogeneity, unevenness, etc., and achieve High thermal adhesion, high adhesiveness, low crystallinity effect

Inactive Publication Date: 2012-04-11
ASAHI KASEI KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although this non-woven fabric is not easy to produce fluff that can cause membrane defects called Cut & Slit, it can be fully suitable as a support for precision filtration membranes and ultrafiltration membranes, but there are still problems as follows: when used as a composite membrane In the case of a support, local defects tend to occur and there is unevenness in desalination performance
However, due to the melting and bonding of low melting point components, local thinning parts will occur, and the uniformity of coating cannot be satisfied, and the dimensional stability at high temperature is insufficient.
[0015] Similarly, in the pamphlet of International Publication No. 2009 / 017086, it is also proposed to use a laminated nonwoven fabric of a sheath-core structure using a low-melting point component for the sheath and a high-melting point component for the core as a membrane support. solid, but insufficient in terms of resinization of low melting point components and dimensional stability at high temperatures
In addition, as a single-component support nonwoven fabric of PET that does not contain low-melting point components and exhibits the tensile strength necessary for a film support and the adhesiveness of surface fibers, it is disclosed that the single Spunbond web (Spunbond web) is a support non-woven fabric obtained by thermocompression bonding; but because it is a single layer, it is prone to inhomogeneity caused by uneven weight per unit area of ​​spunbond and local high weight per unit area. Partial over-crimping leads to thinning, which is not satisfactory

Method used

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  • Composite film substrate and composite film using same
  • Composite film substrate and composite film using same
  • Composite film substrate and composite film using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] (Manufacture of Composite Membrane Support)

[0166] As the surface layer (coated surface of the composite membrane solution), polyethylene terephthalate was used as the thermoplastic resin and the filament group was extruded toward the moving wire surface at a spinning temperature of 300° C. by the spunbonding method to spun Spinning at a speed of 4000m / min, a fiber with a diameter of 11μm and a weight per unit area of ​​31.3g / m was produced on the catch net 2 thermoplastic long fiber web. Next, using polyethylene terephthalate as the intermediate layer, the spinning temperature was 300°C and the heating air was 1000Nm by the melt-blowing method. 3 Spinning under the condition of / hr / m, the average fiber diameter is 1.6μm, and the weight per unit area is 7.4g / m 2 A layer of meltblown fibers was blown onto the spunbond-based thermoplastic long fiber web described above. Further, by the same method as the original thermoplastic long fiber web, the fiber diameter of 12...

Embodiment 2

[0178] Set the diameter of the melt-blown fiber to 1.7 μm and the weight per unit area to 8.2 g / m 2 , set the spunbond unit area weight of the surface and inner layers to 31g / m 2 , except that, a composite membrane support was produced by the same method as in Example 1. A polyamide composite reverse osmosis membrane and a spiral composite reverse osmosis membrane element were fabricated using the obtained composite membrane support and using the same method as in Example 1.

[0179] The properties of the obtained composite membrane support body, polyamide composite reverse osmosis membrane, and spiral composite reverse osmosis membrane element are shown in Table 1 and Table 2 together.

Embodiment 3

[0181] A composite membrane support was produced by the same method as in Example 1 except that the diameter of the melt blown fiber was 1.5 μm. A polyamide composite reverse osmosis membrane and a spiral composite reverse osmosis membrane element were fabricated using the obtained composite membrane support and using the same method as in Example 1.

[0182] The properties of the obtained composite membrane support body, polyamide composite reverse osmosis membrane, and spiral composite reverse osmosis membrane element are shown in Table 1 and Table 2 together.

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Abstract

Disclosed are: a composite film substrate comprising a dry thermoplastic long-fiber nonwoven fabric which has a high uniformity, thereby making it possible to form porous films free from defects such as strike-throughs or pinholes in the course of film formation, which does not generate skin layer defects during the formation of the film layer, and which has a high mechanical strength and a high dimensional stability at high temperatures; and a high-performance composite film and a high-performance composite film element using the same. The composite film substrate, which comprises a layered, dry, thermoplastic, long-fiber nonwoven fabric consisting of three or more layers including at least a melt-blown fiber layer as an intermediate layer and spun-bonded fiber layers on both sides of said intermediate layer, is characterized in that: the average air-flow resistance thereof is 2.0 to 30.0 kPas / m; and a ratio of the average air-flow resistance and the standard deviation is 0.6 or less.

Description

technical field [0001] The present invention relates to a separation membrane support, a method for producing the same, a separation membrane and a separation membrane element using the separation membrane support. More specifically, the present invention relates to a composite membrane support formed by laminating dry-type thermoplastic long-fiber non-woven fabrics with excellent mechanical strength and uniformity, a manufacturing method thereof, a composite membrane using the composite membrane support, and a composite membrane element , the composite membrane support is particularly preferably used for reverse osmosis membranes, nanofiltration membranes, ultrafiltration membranes, gas separation membranes, etc., comprising a skin layer and maintaining a porous layer of the skin layer and reinforcing the skin layer and the porous layer Supported composite membranes. Background technique [0002] Membrane separation technology is widely used in the desalination of river wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D63/10B01D71/48B01D71/56B01D71/68B32B5/26D04H3/02D04H3/16D04H3/009B01D63/00D04H1/559D04H3/14
CPCB32B2250/40B32B2305/28B32B2255/26B01D69/12B32B5/022D04H3/14B32B2305/20B32B2262/0284B32B2262/0276B32B2250/03B32B2250/20B32B2307/726B32B2255/02D04H1/559B32B2305/026B32B5/26D04H3/02B01D63/10B32B2255/28B01D69/10Y02A20/131Y10T442/609Y10T442/66B01D71/68B01D63/00
Inventor 吉田实上野郁雄松尾则尚石塚浩敏藤冈宏树西美咏子
Owner ASAHI KASEI KK
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