JP2010194478A - Wet nonwoven fabric for separation membrane and separation membrane support - Google Patents
Wet nonwoven fabric for separation membrane and separation membrane support Download PDFInfo
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- JP2010194478A JP2010194478A JP2009043838A JP2009043838A JP2010194478A JP 2010194478 A JP2010194478 A JP 2010194478A JP 2009043838 A JP2009043838 A JP 2009043838A JP 2009043838 A JP2009043838 A JP 2009043838A JP 2010194478 A JP2010194478 A JP 2010194478A
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- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 68
- 239000012528 membrane Substances 0.000 title claims abstract description 49
- 238000000926 separation method Methods 0.000 title claims abstract description 46
- 239000000835 fiber Substances 0.000 claims abstract description 145
- 229920000728 polyester Polymers 0.000 claims abstract description 54
- 239000011230 binding agent Substances 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims description 16
- 238000003490 calendering Methods 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 5
- 238000010612 desalination reaction Methods 0.000 abstract description 6
- 239000013535 sea water Substances 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract 1
- -1 polyethylene terephthalate Polymers 0.000 description 32
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 20
- 239000000306 component Substances 0.000 description 18
- 229920000642 polymer Polymers 0.000 description 14
- 239000000123 paper Substances 0.000 description 13
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 10
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 8
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- 230000000704 physical effect Effects 0.000 description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
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- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229920000570 polyether Polymers 0.000 description 5
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 239000011087 paperboard Substances 0.000 description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical group CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 150000002009 diols Chemical class 0.000 description 3
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- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 2
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 2
- 229920001634 Copolyester Polymers 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
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- 239000001361 adipic acid Substances 0.000 description 2
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- 125000005442 diisocyanate group Chemical group 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- TVIDDXQYHWJXFK-UHFFFAOYSA-N dodecanedioic acid Chemical compound OC(=O)CCCCCCCCCCC(O)=O TVIDDXQYHWJXFK-UHFFFAOYSA-N 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
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- 150000002148 esters Chemical class 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000006224 matting agent Substances 0.000 description 2
- NUKZAGXMHTUAFE-UHFFFAOYSA-N methyl hexanoate Chemical compound CCCCCC(=O)OC NUKZAGXMHTUAFE-UHFFFAOYSA-N 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 2
- 229920000747 poly(lactic acid) Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000004626 polylactic acid Substances 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- NCWLXOCGSDEZPX-UHFFFAOYSA-N 1,4-dimethylcyclohexane Chemical compound C[C]1CCC(C)CC1 NCWLXOCGSDEZPX-UHFFFAOYSA-N 0.000 description 1
- BDGCRGQZVSMJLJ-UHFFFAOYSA-N 2,2-dimethylpropane-1,3-diol;hexane-1,6-diol Chemical compound OCC(C)(C)CO.OCCCCCCO BDGCRGQZVSMJLJ-UHFFFAOYSA-N 0.000 description 1
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 1
- HSPRVWPULGKMRC-UHFFFAOYSA-N 57526-50-8 Chemical compound C12CCCC2C2CC(CO)C1C2 HSPRVWPULGKMRC-UHFFFAOYSA-N 0.000 description 1
- 239000004970 Chain extender Substances 0.000 description 1
- 239000004129 EU approved improving agent Substances 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- 239000005058 Isophorone diisocyanate Substances 0.000 description 1
- ALQSHHUCVQOPAS-UHFFFAOYSA-N Pentane-1,5-diol Chemical compound OCCCCCO ALQSHHUCVQOPAS-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 1
- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229920003232 aliphatic polyester Polymers 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 239000006085 branching agent Substances 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- XBZSBBLNHFMTEB-UHFFFAOYSA-N cyclohexane-1,3-dicarboxylic acid Chemical compound OC(=O)C1CCCC(C(O)=O)C1 XBZSBBLNHFMTEB-UHFFFAOYSA-N 0.000 description 1
- FOTKYAAJKYLFFN-UHFFFAOYSA-N decane-1,10-diol Chemical compound OCCCCCCCCCCO FOTKYAAJKYLFFN-UHFFFAOYSA-N 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000003230 hygroscopic agent Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 1
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 1
- WPUMVKJOWWJPRK-UHFFFAOYSA-N naphthalene-2,7-dicarboxylic acid Chemical compound C1=CC(C(O)=O)=CC2=CC(C(=O)O)=CC=C21 WPUMVKJOWWJPRK-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- URLKBWYHVLBVBO-UHFFFAOYSA-N p-dimethylbenzene Natural products CC1=CC=C(C)C=C1 URLKBWYHVLBVBO-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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- 150000003609 titanium compounds Chemical class 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、海水淡水化用分離膜や濃度濃縮等用分離膜の支持体に用いることのできる、地合いと強度に優れた分離膜用湿式不織布に関する。 The present invention relates to a wet nonwoven fabric for separation membranes that can be used as a support for separation membranes for seawater desalination and separation membranes for concentration concentration, etc., and has excellent texture and strength.
従来、分離膜(RO膜)の支持体にポリエステル系湿式不織布が多く使用されてきた(例えば特許文献1、特許文献2参照)。かかるポリエステル系湿式不織布は、ポリエステル主体繊維とポリエステル未延伸型バインダー繊維とで構成され、最終的にカレンダー加工が施されたものである。かかるポリエステル系湿式不織布は湿式抄造されたものであるため、地合いがよいものである。
他方、近年では、分離膜の支持体としてさらに強度の強い不織布の提案が望まれている。
Conventionally, many polyester-based wet nonwoven fabrics have been used as a support for a separation membrane (RO membrane) (see, for example, Patent Document 1 and Patent Document 2). Such a polyester-based wet nonwoven fabric is composed of a polyester main fiber and a polyester unstretched binder fiber, and is finally calendered. Such a polyester-based wet nonwoven fabric has a good texture because it has been wet-made.
On the other hand, in recent years, it has been desired to propose a non-woven fabric having higher strength as a support for the separation membrane.
本発明は上記の背景に鑑みなされたものであり、その目的は、海水淡水化用分離膜や濃度濃縮等用分離膜の支持体に用いることのできる分離膜用湿式不織布であって、地合いと強度に優れた分離膜用湿式不織布、および分離膜支持体を提供することにある。 The present invention has been made in view of the above background, and its purpose is a wet nonwoven fabric for a separation membrane that can be used as a support for a separation membrane for seawater desalination or a separation membrane for concentration concentration, etc. An object of the present invention is to provide a wet nonwoven fabric for a separation membrane having excellent strength, and a separation membrane support.
本発明者は上記の課題を達成するため鋭意検討した結果、ポリエステル繊維からなる主体繊維と芯鞘型ポリエステル複合繊維からなるバインダー繊維とで分離膜用湿式不織布を構成する際、主体繊維とバインダー繊維の単繊維繊度を特定の範囲内とすることにより、地合いと強度に優れた分離膜用湿式不織布が得られることを見出し、さらに鋭意検討を重ねることにより本発明を完成するに至った。 As a result of intensive investigations to achieve the above-mentioned problems, the present inventor found that when forming a wet nonwoven fabric for a separation membrane with a main fiber composed of a polyester fiber and a binder fiber composed of a core-sheath polyester composite fiber, the main fiber and the binder fiber It has been found that a wet nonwoven fabric for a separation membrane having excellent texture and strength can be obtained by making the single fiber fineness within a specific range, and the present invention has been completed by intensive studies.
かくして、本発明によれば「目付けが40〜100g/m2の分離膜用湿式不織布であって、単繊維繊度が0.6〜2.2dtexのポリエステル繊維からなる主体繊維と、単繊維繊度が0.6〜2.2dtexの芯鞘型ポリエステル複合繊維からなるバインダー繊維とを、前記主体繊維とバインダー繊維との重量比(主体繊維/バインダー繊維)90/10〜50/50の範囲内で用いてなることを特徴とする分離膜用湿式不織布。」が提供される。 Thus, according to the present invention, “wet nonwoven fabric for separation membrane having a basis weight of 40 to 100 g / m 2 , a main fiber made of polyester fiber having a single fiber fineness of 0.6 to 2.2 dtex, and a single fiber fineness is A binder fiber composed of a core-sheath type polyester composite fiber of 0.6 to 2.2 dtex is used within a weight ratio of the main fiber to the binder fiber (main fiber / binder fiber) of 90/10 to 50/50. A wet nonwoven fabric for separation membranes ”is provided.
その際、前記芯鞘型ポリエステル複合繊維が、鞘成分に非晶性または結晶性ポリエステルが配された複合繊維であることが好ましい。また、他のバインダー繊維として、単繊維繊度が0.6〜2.2dtexの未延伸ポリエステル繊維が含まれることが好ましい。その際、前記芯鞘型ポリエステル複合繊維と未延伸ポリエステル繊維との重量比(芯鞘型ポリエステル複合繊維/未延伸ポリエステル繊維)が80/20〜20/80の範囲内であることが好ましい。また、不織布を構成する繊維の繊維長が0.1〜25mmの範囲内であることが好ましい。また、不織布がカレンダー加工を施された不織布であることが好ましい。また、不織布の通気度が0.1〜5cc/cm2/sの範囲内であることが好ましい。また、不織布の引張強度が、JIS P8113に規定される裂断長で1km以上であることが好ましい。 At this time, the core-sheath type polyester composite fiber is preferably a composite fiber in which amorphous or crystalline polyester is arranged as a sheath component. Moreover, it is preferable that unstretched polyester fiber whose single fiber fineness is 0.6-2.2 dtex is contained as another binder fiber. In that case, it is preferable that the weight ratio (core-sheath type polyester composite fiber / unstretched polyester fiber) of the said core-sheath-type polyester composite fiber and unstretched polyester fiber exists in the range of 80 / 20-20 / 80. Moreover, it is preferable that the fiber length of the fiber which comprises a nonwoven fabric exists in the range of 0.1-25 mm. Moreover, it is preferable that the nonwoven fabric is a nonwoven fabric subjected to calendering. Moreover, it is preferable that the air permeability of a nonwoven fabric exists in the range of 0.1-5cc / cm < 2 > / s. Moreover, it is preferable that the tensile strength of a nonwoven fabric is 1 km or more by the breaking length prescribed | regulated to JISP8113.
また、本発明によれば、前記の分離膜用湿式不織布を用いてなる分離膜支持体が提供される。 Moreover, according to this invention, the separation membrane support body which uses the said wet nonwoven fabric for separation membranes is provided.
本発明によれば、海水淡水化用分離膜や濃度濃縮等用分離膜の支持体に用いることのできる分離膜用湿式不織布であって、地合いと強度に優れた分離膜用湿式不織布、および分離膜支持体が得られる。 ADVANTAGE OF THE INVENTION According to this invention, it is the wet nonwoven fabric for separation membranes which can be used for the support body of the separation membrane for seawater desalination, a concentration membrane, etc., The wet nonwoven fabric for separation membranes which were excellent in formation and intensity | strength, and separation A membrane support is obtained.
以下、本発明の実施の形態について詳細に説明する。
まず、本発明において、主体繊維となるポリエステル繊維としては、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリトリメチレンテレフタレート、ポリヘキサメチレンテレフタレート、ポリ−1,4−ジメチルシクロヘキサンテレフタレート、ポリピバロラクトンやこれらの共重合体、または、ポリ乳酸やステレオコンプレックスポリ乳酸などの脂肪族ポリエステルを常法により紡糸、延伸した繊維が好ましく例示される。前記ポリエステルとしては、マテリアルリサイクルまたはケミカルリサイクルされたポリエステルであってもよい。さらには、特開2004−270097号公報や特開2004−211268号公報に記載されているような、特定のリン化合物およびチタン化合物を含む触媒を用いて得られたポリエステルでもよい。該ポリマー中には、本発明の目的を損なわない範囲内で必要に応じて、微細孔形成剤、カチオン染料可染剤、着色防止剤、熱安定剤、蛍光増白剤、艶消し剤、着色剤、吸湿剤、無機微粒子が1種または2種以上含まれていてもよい。
Hereinafter, embodiments of the present invention will be described in detail.
First, in the present invention, the polyester fiber as the main fiber is polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyhexamethylene terephthalate, poly-1,4-dimethylcyclohexane terephthalate, polypivalolactone, Preferred examples include fibers obtained by spinning and stretching polymers or aliphatic polyesters such as polylactic acid and stereocomplex polylactic acid by a conventional method. The polyester may be material recycled or chemically recycled polyester. Furthermore, the polyester obtained using the catalyst containing the specific phosphorus compound and titanium compound which are described in Unexamined-Japanese-Patent No. 2004-270097 and 2004-21268 may be sufficient. In the polymer, a fine pore forming agent, a cationic dye dyeing agent, an anti-coloring agent, a heat stabilizer, a fluorescent whitening agent, a matting agent, a coloring agent may be added as necessary within the range not impairing the object of the present invention. 1 type (s) or 2 or more types of an agent, a hygroscopic agent, and inorganic fine particles may be contained.
前記主体繊維となるポリエステル繊維において、単繊維繊度が0.6〜2.2dtexの範囲内にあることが肝要である。該単繊維繊度が0.6dtexよりも小さいと不織布の強度が低下するおそれがあり好ましくない。逆に、該単繊維繊度が2.2dtexよりも大きいと、不織布の地合いが低下するおそれがあり好ましくない。 In the polyester fiber as the main fiber, it is important that the single fiber fineness is in the range of 0.6 to 2.2 dtex. If the single fiber fineness is less than 0.6 dtex, the strength of the nonwoven fabric may be lowered, which is not preferable. On the contrary, when the single fiber fineness is larger than 2.2 dtex, the texture of the nonwoven fabric may be lowered, which is not preferable.
また、前記主体繊維となるポリエステル繊維において、繊維長が0.1〜25mmの範囲内にあることが好ましい。該繊維長が0.1mm未満では、不織布の強度が低下するおそれがある。逆に、該繊維長が25mmよりも大きいと、抄紙の際の繊維分散が悪くなり、地合いが低下するおそれがある。 Moreover, in the polyester fiber used as the said main fiber, it is preferable that fiber length exists in the range of 0.1-25 mm. If the fiber length is less than 0.1 mm, the strength of the nonwoven fabric may be reduced. On the contrary, when the fiber length is longer than 25 mm, fiber dispersion at the time of papermaking deteriorates and the texture may be lowered.
前記主体繊維の捲縮については、ストレート繊維、機械捲縮や異方冷却により捲縮を付与した繊維のどちらでもよい。通常、ストレート繊維は工程安定性、捲縮繊維は嵩性向上のために用いられている。
なお、前記主体繊維の単繊維横断面形状としては、中空、中実、異型いずれでもよい。
The crimp of the main fiber may be either a straight fiber or a fiber that has been crimped by mechanical crimping or anisotropic cooling. Usually, straight fibers are used for process stability, and crimped fibers are used for improving bulkiness.
The single fiber cross-sectional shape of the main fiber may be hollow, solid, or atypical.
一方、本発明でバンダー繊維として用いられる芯鞘型ポリエステル複合繊維としては、鞘成分に熱融着成分と芯成分にポリエチレンテレフタレートなどポリエステルを配しており前者が繊維表面に露出している必要がある。重量割合としては、前者と後者が30/70〜70/30の範囲が適当である。この芯鞘型においては、繊維形成性熱可塑性ポリマーが芯部となるが、該芯部は同心円状あるいは偏心状であってもよい。特に、偏心状のものにあっては、スパイラル捲縮が発現するので好ましい。なお、該複合短繊維の断面形状としては、中空、中実、異型いずれでもよい。 On the other hand, as the core-sheath type polyester composite fiber used as the bander fiber in the present invention, it is necessary that the sheath component is a thermal fusion component and the core component is a polyester such as polyethylene terephthalate and the former is exposed on the fiber surface. is there. As a weight ratio, the range of 30/70 to 70/30 is appropriate for the former and the latter. In this core-sheath type, the fiber-forming thermoplastic polymer becomes the core, but the core may be concentric or eccentric. In particular, an eccentric shape is preferable because spiral crimps are manifested. The cross-sectional shape of the composite short fiber may be hollow, solid, or atypical.
ここで、熱融着成分として配されるポリマーとしては、ポリウレタン系エラストマー、ポリエステル系エラストマー、非弾性ポリエステル系ポリマーおよびその共重合物(共重合系ポリエステルポリマー)、ポリオレフィン系ポリマーおよびその共重合物、ポリビニルアルコール系ポリマーなどを挙げることができる。好ましくは、共重合ポリエステル系ポリマー、およびポリオレフィン系ポリマーである。 Here, as the polymer to be arranged as the heat fusion component, polyurethane elastomer, polyester elastomer, inelastic polyester polymer and copolymer thereof (copolymer polyester polymer), polyolefin polymer and copolymer thereof, A polyvinyl alcohol-type polymer etc. can be mentioned. Of these, a copolyester polymer and a polyolefin polymer are preferable.
上記ポリウレタン系エラストマーとしては、分子量が500〜6,000程度の低融点ポリオール、例えばジヒドロキシポリエーテル、ジヒドロキシポリエステル、ジヒドロキシポリカーボネート、ジヒドロキシポリエステルアミドなどと、分子量500以下の有機ジイソシアネート、例えばp,p’−ジフェニールメタンジイソシアネート、トリレンジイソシアネート、イソホロンジイソシアネート水素化ジフェニールメタンイソシアネート、キシリレンイソシアネート、2,6−ジイソシアネートメチルカプロエート、ヘキサメチレンジイソシアネートなどと、分子量500以下の鎖伸長剤、例えばグリコールアミノアルコールあるいはトリオールとの反応により得られるポリマーである。 Examples of the polyurethane elastomer include low-melting-point polyols having a molecular weight of about 500 to 6,000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyester amide, and the like, and organic diisocyanates having a molecular weight of 500 or less, such as p, p'-. Diphenyl methane diisocyanate, tolylene diisocyanate, isophorone diisocyanate hydrogenated diphenyl methane isocyanate, xylylene isocyanate, 2,6-diisocyanate methyl caproate, hexamethylene diisocyanate and the like and a chain extender having a molecular weight of 500 or less, such as glycol amino alcohol Alternatively, it is a polymer obtained by reaction with triol.
これらのポリマーのうちで、特に好ましいのはポリオールとしてはポリテトラメチレングリコール、またはポリ−ε−カプロラクタムあるいはポリブチレンアジペートを用いたポリウレタンである。この場合の有機ジイソシアネートとしてはp,p’−ビスヒドロキシエトキシベンゼンおよび1,4−ブタンジオールを挙げることができる。 Among these polymers, particularly preferred is a polyurethane using polytetramethylene glycol, poly-ε-caprolactam or polybutylene adipate as a polyol. Examples of the organic diisocyanate in this case include p, p'-bishydroxyethoxybenzene and 1,4-butanediol.
また、ポリエステル系エラストマーとしては、熱可塑性ポリエステルをハードセグメントとし、ポリ(アルキレンオキシド)グリコールをソフトセグメントとして共重合してなるポリエーテルエステル共重合体、より具体的にはテレフタル酸、イソフタル酸、フタル酸、ナフタレン−2,6−ジカルボン酸、ナフタレン−2,7−ジカルボン酸、ジフェニル−4,4’−ジカルボン酸、1,4−シクロヘキサンジカルボン酸などの脂環式ジカルボン酸、コハク酸、シュウ酸、アジピン酸、セバシン酸、ドデカンジ酸、ダイマー酸などの脂肪族ジカルボン酸またはこれらのエステル形成性誘導体などから選ばれたジカルボン酸の少なくとも1種と、1,4−ブタンジオール、エチレングリコールトリメチレングリコール、テトラメチレングリコール、ペンタメチレングリコール、ヘキサメチレングリコールネオペンチルグリコール、デカメチレングリコールなどの脂肪族ジオールあるいは1,1−シクロヘキサンジメタノール、1,4−シクロヘキサンジメタノール、トリシクロデカンメタノールなどの脂環式ジオール、またはこれらのエステル形成性誘導体などから選ばれたジオール成分の少なくとも1種、および平均分子量が約400〜5,000程度のポリエチレングリコール、ポリ(1,2−および1,3−ポリプロピレンオキシド)グリコール、ポリ(テトラメチレンオキシド)グリコール、エチレンオキシドとプロピレンオキシドとの共重合体、エチレンオキシドとテトラヒドロフランとの共重合体などのポリ(アルキレンオキサイド)グリコールのうち少なくとも1種から構成される三元共重合体を挙げることができる。 Polyester elastomers include polyether ester copolymers obtained by copolymerizing thermoplastic polyester as a hard segment and poly (alkylene oxide) glycol as a soft segment, and more specifically, terephthalic acid, isophthalic acid, phthalate. Alicyclic dicarboxylic acids such as acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, succinic acid, oxalic acid , At least one dicarboxylic acid selected from aliphatic dicarboxylic acids such as adipic acid, sebacic acid, dodecanedioic acid and dimer acid, or ester-forming derivatives thereof, 1,4-butanediol, ethylene glycol trimethylene glycol Tetramethylene glyco Alicyclic diols such as diol, pentamethylene glycol, hexamethylene glycol neopentyl glycol, decamethylene glycol or 1,1-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecane methanol, or At least one diol component selected from these ester-forming derivatives and the like, and polyethylene glycol, poly (1,2- and 1,3-polypropylene oxide) glycol having an average molecular weight of about 400 to 5,000, poly At least one of poly (alkylene oxide) glycols such as (tetramethylene oxide) glycol, a copolymer of ethylene oxide and propylene oxide, and a copolymer of ethylene oxide and tetrahydrofuran Can be exemplified et constituted terpolymer.
特に、接着性や温度特性、強度の面からすればポリブチレン系テレフタレートをハード成分とし、ポリオキシブチレングリコールをソフトセグメントとするブロック共重合ポリエーテルエステルが好ましい。 In particular, from the viewpoint of adhesiveness, temperature characteristics, and strength, a block copolymer polyether ester having polybutylene terephthalate as a hard component and polyoxybutylene glycol as a soft segment is preferable.
この場合、ハードセグメントを構成するポリエステル部分は、主たる酸成分がテレフタル酸、主たるジオール成分がブチレングリコール成分であるポリブチレンテレフタレートである。むろん、この酸成分の一部(通常、30モル%以下)は他のジカルボン酸成分やオキシカルボン酸成分で置換されていても良く、同様にグリコール成分の一部(通常、30モル%以下)はブチレングリコール成分以外のジオキシ成分で置換されていても良い。また、ソフトセグメントを構成するポリエーテル部分はブチレングリコール以外のジオキシ成分で置換されたポリエーテルであってよい。 In this case, the polyester portion constituting the hard segment is polybutylene terephthalate in which the main acid component is terephthalic acid and the main diol component is a butylene glycol component. Of course, a part of this acid component (usually 30 mol% or less) may be substituted with another dicarboxylic acid component or an oxycarboxylic acid component, and similarly a part of the glycol component (usually 30 mol% or less). May be substituted with a dioxy component other than the butylene glycol component. Further, the polyether portion constituting the soft segment may be a polyether substituted with a dioxy component other than butylene glycol.
共重合ポリエステル系ポリマーとしては、アジピン酸、セバシン酸などの脂肪族ジカルボン酸、フタル酸、イソフタル酸、ナフタレンジカルボン酸などの芳香族ジカルボン酸類および/またはヘキサヒドロテレフタル酸、ヘキサヒドロイソフタル酸などの脂環式ジカルボン酸類と、ジエチレングリコール、ポリエチレングリコール、プロピレングリコール、パラキシレングリコールなどの脂肪族や脂環式ジオール類とを所定数含有し、所望に応じてパラヒドロキシ安息香酸などのオキシ酸類を添加した共重合エステルなどを挙げることができ、例えばテレフタル酸とエチレングリコールとにイソフタル酸および1,6−ヘキサンジオールを添加共重合させたポリエステルが好ましい。かかるポリエステルは非晶性でもよいし結晶性でもよい。 Copolyester polymers include aliphatic dicarboxylic acids such as adipic acid and sebacic acid, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and naphthalenedicarboxylic acid and / or fats such as hexahydroterephthalic acid and hexahydroisophthalic acid. A co-polymer containing a predetermined number of cyclic dicarboxylic acids and aliphatic or alicyclic diols such as diethylene glycol, polyethylene glycol, propylene glycol, and paraxylene glycol, with addition of oxyacids such as parahydroxybenzoic acid as desired. Polymerized esters and the like can be mentioned. For example, polyester obtained by adding and copolymerizing isophthalic acid and 1,6-hexanediol to terephthalic acid and ethylene glycol is preferable. Such polyester may be amorphous or crystalline.
また、ポリオレフィンポリマーとしては、例えば低密度ポリエチレン、高密度ポリエチレン、ポリプロピレンなどを挙げることができる。
なお、上記熱融着成分と繊維形成性熱可塑性ポリマーには、各種安定剤、紫外線吸収剤、増粘分枝剤、艶消し剤、着色剤、その他各種改良剤などが必要に応じて配合されていてもよい。
Examples of the polyolefin polymer include low density polyethylene, high density polyethylene, and polypropylene.
In addition, various stabilizers, ultraviolet absorbers, thickening and branching agents, matting agents, colorants, and other various improving agents are blended in the heat-fusion component and the fiber-forming thermoplastic polymer as necessary. It may be.
また、他のバインダー繊維として、ポリエステルからなる未延伸繊維を用いてもよい。かかる未延伸繊維としては、ポリエチレンテレフタレートやポリトリメチレンテレフタレート、ポリブチレンテレフタレートなどのポリエステルを紡糸速度が800〜1,200m/分で紡糸された未延伸繊維が挙げられる。好ましくは、ポリエチレンテレフタレートやポリトリメチレンテレフタレートからなる未延伸繊維である。ポリエチレンテレフタレートやポリトリメチレンテレフタレートからなる未延伸繊維は、通常、o−クロロフェノール、35℃で測定された固有粘度が0.80〜1.00dL/gのポリマーを240〜280℃の紡糸口金から吐出し、800〜1,200m/分、好ましくは900〜1,100m/分で巻き取ることにより得られる。この未延伸繊維は、通常、複屈折率が0.01〜0.05で、融点は220〜230℃であり、バインダー繊維として有用である。 Moreover, you may use the unstretched fiber which consists of polyester as another binder fiber. Examples of such unstretched fibers include unstretched fibers obtained by spinning polyester such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate at a spinning speed of 800 to 1,200 m / min. Preferably, it is an undrawn fiber made of polyethylene terephthalate or polytrimethylene terephthalate. An unstretched fiber made of polyethylene terephthalate or polytrimethylene terephthalate is usually o-chlorophenol, a polymer having an intrinsic viscosity measured at 35 ° C. of 0.80 to 1.00 dL / g from a spinneret of 240 to 280 ° C. It is obtained by discharging and winding up at 800 to 1,200 m / min, preferably 900 to 1,100 m / min. This unstretched fiber usually has a birefringence of 0.01 to 0.05 and a melting point of 220 to 230 ° C. and is useful as a binder fiber.
その際、前記芯鞘型ポリエステル複合繊維と未延伸ポリエステル繊維との重量比(芯鞘型ポリエステル複合繊維/未延伸ポリエステル繊維)が80/20〜20/80の範囲内であることが好ましい。 In that case, it is preferable that the weight ratio (core-sheath type polyester composite fiber / unstretched polyester fiber) of the said core-sheath-type polyester composite fiber and unstretched polyester fiber exists in the range of 80 / 20-20 / 80.
前記バインダー繊維において、単繊維繊度が0.6〜2.2dtexの範囲内にあることが肝要である。該単繊維繊度が0.6dtexよりも小さいと不織布の強度が低下するおそれがあり好ましくない。逆に、該単繊維繊度が2.2dtexよりも大きいと、不織布の地合いが低下するおそれがあり好ましくない。 In the binder fiber, it is important that the single fiber fineness is in the range of 0.6 to 2.2 dtex. If the single fiber fineness is less than 0.6 dtex, the strength of the nonwoven fabric may be lowered, which is not preferable. On the contrary, when the single fiber fineness is larger than 2.2 dtex, the texture of the nonwoven fabric may be lowered, which is not preferable.
また、前記バインダー繊維において、繊維長が0.1〜25mmの範囲内にあることが好ましい。該繊維長が0.1mm未満では、不織布の強度が低下するおそれがある。逆に、該繊維長が25mmよりも大きいと、抄紙の際の繊維分散が悪くなり、地合いが低下するおそれがある。 In the binder fiber, the fiber length is preferably in the range of 0.1 to 25 mm. If the fiber length is less than 0.1 mm, the strength of the nonwoven fabric may be reduced. On the contrary, when the fiber length is longer than 25 mm, fiber dispersion at the time of papermaking deteriorates and the texture may be lowered.
不織布を構成する主体繊維とバインダー繊維の重量比率は、(主体繊維/バインダー繊維)90/10〜50/50である。主体繊維が90重量%を超える(バインダー繊維が10重量%未満)と、不織布の形態を構成する接着点が少なくなり過ぎ、強度不足となるおそれがある。一方、主体繊維が50重量%未満(バインダーが50重量%より大)では、接着点が多くなり過ぎるため、不織布そのものが硬くなるおそれがある。 The weight ratio of the main fiber and the binder fiber constituting the nonwoven fabric is (main fiber / binder fiber) 90/10 to 50/50. If the main fiber exceeds 90% by weight (the binder fiber is less than 10% by weight), the number of adhesion points constituting the form of the nonwoven fabric is too small, and the strength may be insufficient. On the other hand, when the main fiber is less than 50% by weight (the binder is greater than 50% by weight), the number of adhesion points increases, and the nonwoven fabric itself may become hard.
本発明の不織布を製造する方法は湿式不織布を製造する通常の方法でよい。すなわち、通常の長網抄紙機、短網抄紙機、丸網抄紙機、あるいはこれらを複数台組み合わせて多層抄きなどにしても何ら問題ない。 The method for producing the nonwoven fabric of the present invention may be a normal method for producing a wet nonwoven fabric. That is, there is no problem even if a normal long paper machine, a short paper machine, a round paper machine, or a combination of a plurality of these is used to make a multi-layer paper.
熱処理工程としては、抄紙工程後、ヤンキードライヤー、あるいはエアースルードライヤーのどちらでも可能である。また、金属/金属ローラー、金属/ペーパーローラー、金属/弾性ローラーなどのカレンダー/エンボスを施しても良い。特にカレンダー加工(2本のロールの間に不織布を通す加工)を不織布に施すと、バインダー繊維である芯鞘型ポリエステル複合繊維の鞘部が熱溶融し、該バインダー繊維により主体繊維が熱接着されるため、不織布の強度が向上し好ましい。 As the heat treatment process, either a Yankee dryer or an air-through dryer is possible after the paper making process. Moreover, you may give calendar / embossing, such as a metal / metal roller, a metal / paper roller, and a metal / elastic roller. In particular, when calendering (processing of passing a nonwoven fabric between two rolls) is applied to the nonwoven fabric, the sheath portion of the core-sheath polyester composite fiber, which is a binder fiber, is thermally melted, and the main fiber is thermally bonded by the binder fiber. Therefore, the strength of the nonwoven fabric is improved, which is preferable.
ここで、熱カレンダー処理は、通常、温度が150〜230、好ましくは180〜200℃で、圧力は80〜240kg/cm、好ましくは120〜180kg/cmである。 Here, in the heat calendering process, the temperature is usually 150 to 230, preferably 180 to 200 ° C., and the pressure is 80 to 240 kg / cm, preferably 120 to 180 kg / cm.
かくして得られた分離膜用湿式不織布は、前記のような特定の単繊維繊度を有する主体繊維とバインダー繊維とで構成されるので、地合いと強度(引張り強度)とが両立する。
ここで、不織布の目付としては40〜100g/m2、さらには50〜80g/m2が好ましい。40g/m2未満では支持体としての機能を発揮するだけの強度等を達成する事が困難であり、100g/m2を超える場合、現状の軽量化、コンパクト性の目標から離れるおそれがあり、好ましくない。
Since the wet nonwoven fabric for separation membrane thus obtained is composed of main fibers and binder fibers having a specific single fiber fineness as described above, both the formation and strength (tensile strength) are compatible.
Here, the basis weight of the nonwoven fabric is preferably 40 to 100 g / m 2 , more preferably 50 to 80 g / m 2 . If it is less than 40 g / m 2, it is difficult to achieve strength and the like sufficient to exhibit the function as a support, and if it exceeds 100 g / m 2 , there is a risk of leaving the current weight reduction and compactness targets, It is not preferable.
また、不織布の通気度としては0.1〜5cc/cm2/sである事が好ましく、さらには0.5〜2cc/cm2/sである事が好ましい。0.1cc/cm2/s未満では不織布が潰れ過ぎている為、性能バランス面からあまり好ましくない。逆に、通気度が5cc/cm2/sを超えた場合、表面が粗すぎて、ピンホール等を生じる可能性が高くおそれがある。
また、不織布の引張強度が、JIS P8113に規定される裂断長で1km以上であると、分離膜の支持体として好適に用いられ好ましい。
Moreover, it is preferable that it is 0.1-5 cc / cm < 2 > / s as air permeability of a nonwoven fabric, and it is further more preferable that it is 0.5-2 cc / cm < 2 > / s. If it is less than 0.1 cc / cm 2 / s, the nonwoven fabric is too crushed, which is not preferable from the viewpoint of performance balance. Conversely, if the air permeability exceeds 5 cc / cm 2 / s, the surface is too rough and there is a high possibility that pinholes and the like are generated.
Further, the tensile strength of the non-woven fabric is preferably 1 km or more in terms of the breaking length specified in JIS P8113, which is preferably used as a support for the separation membrane.
次に本発明の実施例及び比較例を詳述するが、本発明はこれらによって限定されるものではない。なお、実施例中の各測定項目は下記の方法で測定した。
(1)引張り強度(裂断長)
JIS P8113(紙及び板紙の引張強さ試験方法)に基づいて実施した。
(2)伸度
JIS P8132(紙及び板紙の伸び試験方法)に基づいて実施した。
(3)目付
JIS P8124(紙のメートル坪量測定方法)に基づいて実施した。
(4)厚み
JIS P8118(紙及び板紙の厚さと密度の試験方法)に基づいて実施した。
(5)密度
JIS P8118(紙及び板紙の厚さと密度の試験方法)に基づいて実施した。
(6)通気度
JIS L1913(一般短繊維不織布試験方法)に基づいて測定した。
Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
(1) Tensile strength (breaking length)
The test was carried out based on JIS P8113 (Test method for tensile strength of paper and paperboard).
(2) Elongation It implemented based on JISP8132 (elongation test method of paper and paperboard).
(3) Basis weight It implemented based on JIS P8124 (Measuring basis weight of paper).
(4) Thickness The thickness was measured based on JIS P8118 (Test method for thickness and density of paper and paperboard).
(5) Density Conducted based on JIS P8118 (Testing method for thickness and density of paper and paperboard).
(6) Air permeability Measured based on JIS L1913 (general short fiber nonwoven fabric test method).
[実施例1]
常法によって製造された、ポリエチレンテレフタレートからなるポリエステル主体繊維(帝人ファイバー株式会社、登録商標:テピルス、銘柄:TT04N SD1.7dtex×5mm)と非晶性芯鞘型バインダー繊維SD1.7dtex×5mm、鞘成分:テレフタル酸が60モル%、イソフタル酸が40モル%、エチレングリコールが96モル%、ジエチレングリコールが4モル%の割合で共重合されたポリエステル)を(主体繊維/バインダー繊維)80/20の重量比で混合撹拌し、ハンド抄紙機(熊谷理機工業製、型番:No.2555、標準角型シートマシン、以下同じ)を用いて、75g/m2を抄紙した後、ドライヤー(熊谷理機工業製、型番:No.2575−II、回転式乾燥機(高温型))を用いて、130℃×2分で乾燥処理を施した。その後、金属/金属からなるカレンダー加工(160℃×200kg(1960N)/cm)を施し、不織布を得た。その物性を表1に示す。
次いで、該不織布を用いて、海水淡水化用分離膜支持体および濃度濃縮等用分離膜支持体を得た。
[Example 1]
Polyester-based fiber made of polyethylene terephthalate (Teijin Fibers Limited, registered trademark: Tepyrus, brand: TT04N SD1.7 dtex × 5 mm) and amorphous core-sheath binder fiber SD1.7 dtex × 5 mm, sheath Ingredient: 60% by mole of terephthalic acid, 40% by mole of isophthalic acid, 96% by mole of ethylene glycol and 4% by mole of diethylene glycol) (main fiber / binder fiber) 80/20 weight After mixing and stirring at a ratio, using a hand paper machine (manufactured by Kumagai Riki Kogyo Co., Ltd., model number: No. 2555, standard square sheet machine, the same shall apply hereinafter), 75 g / m 2 of paper was made, and then a dryer (Kumaya Riki Kogyo Co., Ltd.). Product, model: No. 2575-II, using a rotary dryer (high temperature type)), dry at 130 ° C for 2 minutes A drying treatment was performed. Thereafter, calendar processing (160 ° C. × 200 kg (1960 N) / cm) made of metal / metal was applied to obtain a nonwoven fabric. The physical properties are shown in Table 1.
Then, using the nonwoven fabric, a separation membrane support for seawater desalination and a separation membrane support for concentration concentration and the like were obtained.
[実施例2]
実施例1の中で、混合比率を(主体繊維/バインダー繊維)60/40に変更した以外は同様の方法で加工し同じく不織布を得た。その物性を表1に示す。
[Example 2]
A non-woven fabric was obtained in the same manner as in Example 1 except that the mixing ratio was changed to (main fiber / binder fiber) 60/40. The physical properties are shown in Table 1.
[実施例3]
実施例1記載の中でバインダー繊維を結晶性芯鞘型バインダー繊維(SD1.7dtex×5mm 鞘成分:イソフタル酸20モル%−テトラメチレングリコール50モル%共重合ポリエステル)に変更し、ドライヤー温度を150℃×2分に変更した後、カレンダー加工(180℃×200kg(1960N)/cm)を実施する事で不織布を得た。その物性を表1に示す。
[Example 3]
In Example 1, the binder fiber was changed to a crystalline core-sheath binder fiber (SD 1.7 dtex × 5 mm sheath component: isophthalic acid 20 mol% -tetramethylene glycol 50 mol% copolymer polyester), and the dryer temperature was 150. After changing to ° C. x 2 minutes, a nonwoven fabric was obtained by carrying out calendar processing (180 ° C. x 200 kg (1960 N) / cm). The physical properties are shown in Table 1.
[実施例4]
実施例1記載の2種類の繊維に更に繊度の異なる主体繊維(帝人ファイバー株式会社、登録商標:テピルス、銘柄:TA04N SD0.6dtex×5mm)を足し、その比率を、主体繊維1.7dtex×5mm/主体繊維0.6dtex×5mm/バインダー繊維1.7dtex×5mm=40/40/20とする以外は同様の方法で不織布を得た。その物性を表1に示す。
[Example 4]
Main fiber (Teijin Fibers Ltd., registered trademark: Tepyrus, brand: TA04N SD 0.6 dtex × 5 mm) having different fineness is added to the two types of fibers described in Example 1, and the ratio is 1.7 dtex × 5 mm. A nonwoven fabric was obtained in the same manner except that: / main fiber 0.6 dtex × 5 mm / binder fiber 1.7 dtex × 5 mm = 40/40/20. The physical properties are shown in Table 1.
[比較例1]
実施例1において、バインダー繊維を、ポリエチレンテレフタレートからなる未延伸型バインダー繊維(帝人ファイバー株式会社、登録商標:テピルス、銘柄:TA07N SD1.2dtex×5mm)に変更する以外は同様の方法で不織布を得た。その物性を表1に示す。
[Comparative Example 1]
In Example 1, a nonwoven fabric was obtained in the same manner except that the binder fiber was changed to an unstretched binder fiber made of polyethylene terephthalate (Teijin Fibers Ltd., registered trademark: Tepyrus, brand: TA07N SD1.2 dtex × 5 mm). It was. The physical properties are shown in Table 1.
[比較例2]
実施例1記載のポリエステル主体繊維を繊度の異なるものに変更(帝人ファイバー株式会社、登録商標:テピルス、銘柄:TT04N SD3.3dtex×5mm)した以外は同様の方法で不織布を得た。その物性を表1に示す。
[Comparative Example 2]
A nonwoven fabric was obtained by the same method except that the polyester main fiber described in Example 1 was changed to one having a different fineness (Teijin Fibers Ltd., registered trademark: Tepyrus, brand: TT04N SD3.3 dtex × 5 mm). The physical properties are shown in Table 1.
[比較例3]
実施例1の中で、混合比率を(主体繊維/バインダー繊維)40/60に変更した以外は同様の方法で加工し同じく不織布を得た。その物性を表1に示す。
[Comparative Example 3]
A non-woven fabric was obtained in the same manner as in Example 1 except that the mixing ratio was changed to (main fiber / binder fiber) 40/60. The physical properties are shown in Table 1.
[比較例4]
実施例1記載のバインダー繊維を繊度の異なるものに変更(帝人ファイバー株式会社、登録商標:テピルス、銘柄:TJ04BN SD3.3dtex×5mm)した以外は同様の方法で不織布を得た。その物性を表1に示す。
[Comparative Example 4]
A nonwoven fabric was obtained in the same manner except that the binder fiber described in Example 1 was changed to one having a different fineness (Teijin Fibers Ltd., registered trademark: Tepyrus, brand: TJ04BN SD3.3 dtex × 5 mm). The physical properties are shown in Table 1.
本発明によれば、海水淡水化用分離膜や濃度濃縮等用分離膜の支持体に用いることのできる分離膜用湿式不織布であって、地合いと強度に優れた分離膜用湿式不織布、および分離膜支持体が提供され、その工業的価値は極めて大である。 ADVANTAGE OF THE INVENTION According to this invention, it is the wet nonwoven fabric for separation membranes which can be used for the support body of the separation membrane for seawater desalination, a concentration membrane, etc., The wet nonwoven fabric for separation membranes which were excellent in formation and intensity | strength, and separation A membrane support is provided, and its industrial value is enormous.
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