CN100389860C - Semipermeable membrane support material and its production method - Google Patents

Semipermeable membrane support material and its production method Download PDF

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CN100389860C
CN100389860C CNB2004100867395A CN200410086739A CN100389860C CN 100389860 C CN100389860 C CN 100389860C CN B2004100867395 A CNB2004100867395 A CN B2004100867395A CN 200410086739 A CN200410086739 A CN 200410086739A CN 100389860 C CN100389860 C CN 100389860C
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semipermeable membrane
membrane support
sheath
weight
core composite
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CNB2004100867395A
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Chinese (zh)
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CN1768911A (en
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萧弘毅
郑淑蕙
陈联泰
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财团法人工业技术研究院
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Abstract

The present invention relates to a semipermeable membrane supporting material and a production method thereof. The supporting material comprises polyester short fibers of which the weight is from 10 to 70 %, sheath-core composite short fibers of which the weight is from 30 to 70 % and polyolefin fibers of which the weight is from 3 to 40 %, wherein the sheath part of the sheath-core composite short fibers have a melting point lower than that of the core part, and the polyolefin fibers have the specific surface area of 1 to 15m<2>/g. the polyester short fibers, the sheath-core composite short fibers and the polyolefin fibers can be uniformly mixed to fabricate unwoven cloth or the semipermeable membrane supporting material. The semipermeable membrane supporting material of the present invention has high strength and a good aspect ratio, and the aspect ratio can be within the range of 1.0 to 1.5; moreover, the semipermeable membrane supporting material can be fabricated by directly utilizing the existing traditional paper device, particularly a cylinder type paper machine, to fabricate a single-layer fiber layer in a wet mode.

Description

Semipermeable membrane support material and manufacture method thereof
Technical field
The invention relates to a kind of semipermeable membrane support material and method for making thereof.
Background technology
Pellicle is that a kind of surface has porous, is widely used in that desalinization, wastewater treatment, food concentrate, microorganism separation, blood filtration and make manufacture of semiconductor or clean and use with fields such as ultra-pure waters.Generally speaking, pellicle is a kind of synthetic high polymer film, and itself has low mechanical strength.Therefore, often with adhesive-bonded fabric, fabric and similar products as its fid, the polymer macromolecule promptly is coated on this fid and forms pellicle.
Pellicle is meant that generally ultraprecises such as hyperfiltration or reverse osmosis filter, and generally needs to operate under near 100 atmospheric pressure at high pressure.The semipermeable membrane support material that therefore, need have high strength and dimensional stability.Tradition be to use fabric or porous not fabric be fid, but still have problems such as easy stripping layer and generation pin hole.For solving above-mentioned shortcoming and satisfying operation under high pressure, be the earliest to increase the fid basic weight as solution.But, increase cost relatively and reduce filter efficiency.German afterwards Freudenberg carl FA company is in United States Patent (USP) the 4th, 728, No. 394 and the 4th, 795, No. 559 etc., proposition is the semipermeable membrane support material of being fitted and being formed by the two-layer adhesive-bonded fabric of low-density and high density, has high strength though this kind has the adhesive-bonded fabric of double-layer structure, still has shortcomings such as easy delamination of two-layer applying and pellicle processability be bad.
October in 2000, European patent case on the 18th EP 1044719A1 disclosed a kind of individual layer semipermeable membrane support material of being made up of polyester staple fiber, it is characterized by the breaking length of fid when 5% extension more than or equal to 4.0km and air permeability at 0.2-10cc/cm 2/ Sec scope.This kind individual layer semipermeable membrane support material has been improved fit shortcomings such as easy delamination and pellicle processability be bad of two-layer adhesive-bonded fabric.But vertical/lateral pull intensity of semipermeable membrane support material still has evident difference, problem such as makes procedure for processing at pellicle to produce seriously to batch.
May in 2002, the U.S. on the 16th patent case disclosed a kind of semipermeable membrane support material and preparation method thereof No. 20020056535, it is characterized in that a kind of principal fiber and adhesive-bonded fabric that coheres fiber (20: 80-70: 30 weight %) of comprising.These two kinds of fibers are fine fibers of synthetic resin (fine fiber), and its fiber finer directly is a 0.6-8.9 dtex (decitex).Above-mentioned fiber mixing utilizes oblique net formula paper machine to copy and makes thin paper and dry, making this kind adhesive-bonded fabric through heating of calender processing and utilizing and the routine processes of pressurizeing again is fit to as semipermeable membrane support material, it is characterized by semipermeable membrane support material, to have in the hot strength of the direction of paper charging be 2 with horizontal hot strength ratio: 1-1: 1, and can solve to add and can produce shortcomings such as curling man-hour at the pellicle macromolecular coating.
Yet, when only fusing fiber with polyester staple fiber and heat is that the polyester fiber adhesive-bonded fabric of raw material is during as fid, the preparation of this kind fid also is not easy to utilize tradition to copy paper equipment, especially cylinder paper machine is copied to make and is had high strength and be 2 in the hot strength of the direction of paper charging with horizontal hot strength ratio: 1-1: 1 semipermeable membrane support material.
Therefore, as the semipermeable membrane support material aspect, have processing procedure than double-layer structure and simply reach advantages such as low cost, but still have shortcomings such as needing to use special wet type former with the adhesive-bonded fabric of single layer structure.Therefore, need badly a kind of better semipermeable membrane support material and more easily the fid method for making to overcome above-mentioned shortcoming.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of semipermeable membrane support material, this semipermeable membrane support material is an individual layer, the polyester fiber and other fiber that contain main amount, can utilize tradition to copy paper equipment easily and make, and have high strength 6-8kg/15mm and be 1.5 with horizontal hot strength ratio: 1-1: 1 and air permeability 0.2-10c.c./cm in the hot strength of the direction of paper charging 2The semipermeable membrane support material of/sec.
Another object of the present invention provides a kind of method of making semipermeable membrane support material, can simply utilize tradition to copy paper equipment, copies system single layer fibre layer further to make the semipermeable membrane support material of preferred dimensions stability.
According to a purpose of the present invention, a kind of semipermeable membrane support material is provided, it comprises that the sheath portion fusing point of polyester staple fiber, the 30-70 weight % of 10-70 weight % is the 1-15m that has of low sheath core (sheath-core) composite short fiber and 3-40 weight % than core 2The polyolefin filaments pulp fibres of the specific area of/g (pulp fiber), three's content summation is no more than 100 weight %, wherein, this polyester staple fiber, this sheath core composite short fiber and this polyolefin filaments pulp fibres are to be mixed into the fiber body to form the structure of adhesive-bonded fabric (non-woven web).
The sheath portion fusing point of sheath core composite fibre of the present invention is than low 20-150 ℃ of core fusing point.
Sheath of the present invention portion is polyester or polyolefin, and this core is a polyester.
According to another object of the present invention, a kind of method for making of semipermeable membrane support material is provided, comprise the polyester staple fiber of 10-70 weight portion, the core sheath composite short fiber of 30-70 weight portion and the polyolefin filaments pulp fibres of 3-40 weight portion are dispersed in the water, be made into the fibre stuff of 0.1-0.5 weight %, wherein, the sheath portion of this sheath core composite short fiber to have than core be low fusing point; Carry out wet type for this fibre stuff and copy the paper program, obtain a wet fiber layer; And with this wet fiber layer drying, and under 110-150 ℃, carry out the step that hot calendered is handled, and use obtaining this semipermeable membrane support material, it has the adhesive-bonded fabric structure.
It is to copy paper equipment with tradition to carry out that wet type described in the inventive method is copied the paper program.
It is fourdrinier wire formula, cylinder or oblique net formula that tradition described in the inventive method is copied paper equipment.
Polyolefin filaments pulp fibres described in the inventive method is to use with the form of silk pulp fibres (pulpfiber).
The sheath portion fusing point of the sheath core composite fibre described in the inventive method carries out hot calendered to the temperature that is higher than between 50 ℃ of this fusing points to be handled.
The polyolefin filaments pulp fibres content of semipermeable membrane support material of the present invention is at 3-40 weight %, therefore can utilize traditional existing paper equipment of copying easily, especially cylinder paper machine, wet type is copied and is made the single layer fibre layer, further to make semipermeable membrane support material of the present invention.It has high strength 5-8kg/15mm and is 1.5 in the hot strength of the direction of paper charging with horizontal hot strength ratio: 1-1: 1 and air permeability 0.2-10c.c./c m 2The semipermeable membrane support material of/sec.
Description of drawings
Fig. 1 is the micrograph according to the employed polyolefin filaments pulp fibres of a specific embodiment of the present invention.
Fig. 2 is the semipermeable membrane support material manufacturing flow chart according to a specific embodiment of the present invention.
The specific embodiment
Semipermeable membrane support material of the present invention comprises polyester staple fiber, sheath core composite short fiber and polyolefin filaments pulp fibres.But be not limited to be applicable to that polyester staple fiber of the present invention can be any thermoplastic polyester fiber, length can be 3-12m m, and this is preferably 5-8m m.The red Buddhist nun's number of fiber is the red Buddhist nun of 0.5-5.The content of polyester staple fiber in semipermeable membrane support material is 10-70 weight %, is preferably 20-60 weight %, is more preferred from 30-50 weight %.
Be applicable to sheath core composite fibre of the present invention, can be any thermoplastic fibre, it is low that the fusing point of sheath portion needs than core, generally hangs down 20-150 ℃ approximately, is preferably 30-130 ℃.There is no particular restriction for sheath portion thickness and core diameters, and the red Buddhist nun's number of whole sheath core composite fibre can be the red Buddhist nun of 1-5, is preferably the red Buddhist nun of 1-3.There is no particular restriction for length.Core can be for example polyester, and aromatic series kind polyester for example is such as but not limited to PET (polyethylene terephthalate; PET) or polybutylene terephthalate (polybutylene terephthalate; PBT) or polypropylene fibre (polyp roplene; PP).Sheath portion can be for example polyester or the polyolefin of relatively low fusing point, such as but not limited to more low-melting polyester or polyethylene (p olyethylene; P E), polypropylene (polyp roplene; PP).The content of sheath core composite short fiber in semipermeable membrane support material is 30-70 weight %, is preferably 30-60 weight %, is more preferred from 40-60 weight %.
Being applicable to polyolefin filaments pulp fibres of the present invention, is from the synthetic silk slurry (pulp fiber claims a pulp fibres at this, to distinguish with natural pulp) with the prepared similar paper pulp of polyolefine fiberization, can be from buying on the market.Preferable its has 1-15m 2The specific area of/g.The fiber that this kind fibrillatable silk slurry is contained adheres fiber with above-mentioned polyester staple fiber and sheath core composite short fiber mutually through Overheating Treatment, forms the miniaturization network structure, and promptly the structure of adhesive-bonded fabric becomes the semipermeable membrane support material that the present invention desires.Therefore, use this kind polyolefin filaments pulp fibres in semipermeable membrane support material of the present invention, its porosity, aspect ratio and gas permeability with fid that adjustment is desired reaches the miscellaneous function as moulding.Polyolefin can be exemplified as polyethylene (PE), polypropylene (PP) etc., but is not limited thereto.The fusing point of employed polyolefin filaments pulp fibres is preferably the fusing point of the sheath portion material that is higher than aforesaid sheath core composite short fiber.The content of polyolefin filaments pulp fibres in semipermeable membrane support material is 3-40 weight %, is preferably 5-30 weight %, is more preferred from 10-20 weight %.
For another object of the present invention, be a kind of method of making semipermeable membrane support material, comprise the following steps:
The polyolefin filaments pulp fibres as above-mentioned as above-mentioned sheath core composite short fiber and 3-40 weight % as above-mentioned polyester staple fiber, 30-70 weight % of 10-70 weight % is dispersed in the water, be made into fibrous suspension and contain 0.05-1.0 weight %, be preferably 0.075-0.75 weight %, be more preferred from the slurry of the fiber of 0.1-0.5 weight %.The polyolefin filaments pulp fibres is preferably with the form of silk slurry and uses, and gets its amount that is equivalent to contain the polyolefin filaments pulp fibres of 3-40 weight % and uses.
Carry out wet type for the fibre stuff of above-mentioned formation and copy the paper program, to obtain the wet fibrage of one deck.Wet type is copied the paper program and is not limited to use oblique net formula paper machine can utilize general tradition to copy paper equipment to carry out, and for example, fourdrinier wire formula or cylinder all can.Copy paper through wet type, obtain the wet fibrage of one deck.
For example utilize drying cylinder etc. to carry out drying the wet fibrage of gained.Under 110-150 ℃, carry out hot calendered and handle then, use obtaining this semipermeable membrane support material, it has the adhesive-bonded fabric structure.
Semipermeable membrane support material of the present invention can utilize tradition to copy the paper program and device is made polyester fiber wet type adhesive-bonded fabric, and then makes semipermeable membrane support material, the processing procedure facility.The semipermeable membrane support material of gained has hot strength more than 6kg/15mm, compares at 1.0-1.5 and air permeability 0.2-10c.c./cm to hot strength in length and breadth 2/ sec.Can be fit to that desalinization, wastewater treatment, food concentrate as being applied to, microorganism separates, the medical applications of blood filtration and make the fid of cleaned semiconductor with the pellicle in fields such as ultra-pure water.
For above and other objects of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, be described in detail below:
Embodiment 1
With the fibre length of 2g is that the length of the 0.8 red Buddhist nun's of 6mm polyester staple fiber (as the SH-2840 of Far East chemical fibre company), 1.6g is that (its mesotheca portion composition is a polyester for the 2 red Buddhist nuns' of 6m m sheath core composite short fiber, fusing point is 110 ℃, the core composition is a polyester, fusing point is 256 ℃, as the SH-2240CM of Far East chemical fibre company) and the specific area of 0.4g be 10m 2The polyethylene filament pulp fibres of/g (as the SWP E of Mitsui petrochemistry company 400) is dispersed in the water, and three's weight ratio is 50: 40: 10 in regular turn, and is as shown in table 1, is made into the fibre stuff that fibrous suspension contains the fiber of 0.5 weight %.Use the handmade paper machine of length and width 25cm * 25cm that this fibre stuff is carried out the wet type handmade paper, form the wet fibrage of one deck.Use baking oven that the wet fibrage of gained is carried out drying under 105 ℃.Under 125 ℃ and 80kg/cm pressure, carry out hot calendered then and handle, obtain to have the adhesive-bonded fabric structure as semipermeable membrane support material of the present invention.
For prepared semipermeable membrane support material, recording average thickness is that 0.115mm, basic weight are 71g/m 2, density is 0.62g/cm3, recording air permeability with JI SL1096A method is 3.6c.c./cm 2/ sec, recording pulling force with TAPPI T494 method is 6.19kg/15mm, ductility is 8.8%.Each data is as shown in table 1.
Embodiment 2 to 9
To make semipermeable membrane support material of the present invention as the same way as of embodiment 1, but change 0.8 red Buddhist nun's polyester staple fiber, 2 red Buddhist nuns' sheath core composite short fiber and the usage ratio of polyethylene filament pulp fibres, make as semipermeable membrane support material of the present invention, and record the data of each character, as shown in table 1.
Embodiment 10 to 11 and 13
To make semipermeable membrane support material of the present invention as the same way as of embodiment 1, but use 1.5 red Buddhist nuns and 0.8 red Buddhist nun's polyester staple fiber, 2 red Buddhist nuns' sheath core composite short fiber and polyethylene filament pulp fibres, usage ratio is as shown in table 1, make as semipermeable membrane support material of the present invention, and record the data of each character, as shown in table 1.
Embodiment 12 and 14 to 15
To make semipermeable membrane support material of the present invention as the same way as of embodiment 1, but use 1.5 red Buddhist nuns' polyester staple fiber, 2 red Buddhist nuns' sheath core composite short fiber and polyethylene filament pulp fibres, usage ratio is as shown in table 1, make as semipermeable membrane support material of the present invention, and record the data of each character, as shown in table 1.
Table 1
Embodiment Polyethylene filament pulp fibres % The compound short fiber % of sheath core Polyester staple fiber (1.5 red Buddhist nun) % Polyester staple fiber (0.8 red Buddhist nun) % Basic weight g/m 2 Average thickness mm Density g/cm 3 Air permeability cc/ cm 2/s ??ec Hot strength kg/15 mm Ductility %
??1 ??10 ??40 ??0 ??50 ??65 ??0.115 ??0.62 ??3.6 ??6.19 ??8.8
??2 ??10 ??40 ??0 ??50 ??75 ??0.117 ??0.71 ??2.78 ??5.86 ??8.07
??3 ??10 ??40 ??0 ??50 ??70 ??0.106 ??0.71 ??2.28 ??6.15 ??10.19
??4 ??10 ??20 ??0 ??70 ??65 ??0.133 ??0.53 ??2.94 ??5.11 ??7.81
??5 ??10 ??20 ??0 ??70 ??70 ??0.112 ??0.71 ??3.54 ??3.52 ??3.71
??6 ??10 ??20 ??0 ??70 ??75 ??0.129 ??0.62 ??2.35 ??4.18 ??5.03
??7 ??10 ??60 ??0 ??30 ??75 ??0.108 ??0.72 ??2.89 ??7.8 ??12.75
??8 ??10 ??60 ??0 ??30 ??70 ??0.113 ??0.67 ??3.87 ??5.97 ??11.04
??9 ??10 ??60 ??0 ??30 ??65 ??0.108 ??0.68 ??3.41 ??7.26 ??14.46
??10 ??10 ??40 ??25 ??25 ??75 ??0.122 ??0.64 ??8.59 ??5.31 ??8.1
??11 ??10 ??40 ??25 ??25 ??65 ??0.114 ??0.61 ??6.21 ??4.92 ??8.07
??12 ??10 ??40 ??50 ??0 ??65 ??0.097 ??0.67 ??9.76 ??4.05 ??6.71
??13 ??10 ??40 ??25 ??25 ??70 ??0.109 ??0.71 ??6.03 ??5.97 ??10.29
??14 ??10 ??40 ??50 ??0 ??75 ??0.129 ??0.64 ??8.51 ??6.02 ??7.84
??15 ??10 ??40 ??50 ??0 ??70 ??0.097 ??0.77 ??8.17 ??5.01 ??8.85
Comparative example 1
Making semipermeable membrane support material of the present invention as the same way as of embodiment 1, but only use 0.5 red Buddhist nun's polyester staple fiber and sheath core composite short fiber, usage ratio is as shown in table 2, makes as semipermeable membrane support material of the present invention, and recording air permeability is 6.5c.c./cm 2/ sec, as shown in table 2.
Embodiment 16
To make semipermeable membrane support material of the present invention as the same way as of comparative example 1, but use 0.5 red Buddhist nun's polyester staple fiber, sheath core composite short fiber and polyethylene filament pulp fibres, usage ratio is as shown in table 2, makes as semipermeable membrane support material of the present invention, and recording air permeability is 0.52c.c./cm 2/ sec, as shown in table 2.Show by the data that record, with comparative example 1 than than, same polyester staple fiber and the sheath core composite short fiber that uses 0.5 red Buddhist nun, but further replace the half sheath core composite short fiber of measuring with the polyethylene filament pulp fibres according to embodiments of the invention 16, the air permeability of the semipermeable membrane support material of gained is much smaller than the air permeability of comparative example 1 gained.
Comparative example 2
Making semipermeable membrane support material of the present invention as the same way as of embodiment 1, but only use 4 red Buddhist nuns' polyester staple fiber and sheath core composite short fiber, usage ratio is as shown in table 2, makes as semipermeable membrane support material of the present invention, and recording air permeability is 20.2c.c./cm 2/ sec, as shown in table 2.
Embodiment 17
To make semipermeable membrane support material of the present invention as the same way as of comparative example 2, but use 4 red Buddhist nuns' polyester staple fiber, sheath core composite short fiber and polyethylene filament pulp fibres, usage ratio is as shown in table 2, makes as semipermeable membrane support material of the present invention, and recording air permeability is 4.69c.c./cm 2/ sec, as shown in table 2.Show by the data that record, with comparative example 2 than than, same polyester staple fiber and the sheath core composite short fiber that uses 3 red Buddhist nuns, but further replace the half sheath core composite short fiber of measuring with the polyethylene filament pulp fibres according to embodiments of the invention 17, the air permeability of the semipermeable membrane support material of gained is much smaller than the air permeability of comparative example 2 gained.
Table 2
0.5 red Buddhist nun's polyester staple fiber 4 red Buddhist nun's polyester staple fibers Sheath core composite short fiber The polyethylene filament pulp fibres Air permeability c.c./cm 2/sec
Comparative example 1 ??60% ??0 ??40% ??0 ??6.5
Embodiment 16 ??60% ??0 ??20% ??20% ??0.52
Comparative example 2 ??0 ??60% ??40% ??0 ??20.2
Embodiment 17 ??0 ??60% ??20% ??20% ??4.69
Embodiment 18
With the fibre length of 50kg is that the length of the 0.8 red Buddhist nun's of 6mm polyester staple fiber, 32kg is that (its mesotheca portion composition is a polyester for the 2 red Buddhist nuns' of 6m m sheath core composite short fiber, fusing point is 110 ℃, the core composition is a polyester, and fusing point is that the specific area of 256 ℃ and 32kg is 10m 2The polyethylene filament pulp fibres of/g is dispersed in the water, and three's weight ratio is 50: 32: 18 in regular turn, and is as shown in table 1, is made into the fibre stuff that fibrous suspension contains the fiber of 0.5 weight %.The cylinder paper machine of use fabric width 90cm carries out wet type with the 20m/min speed of manufacturing paper with pulp with this fibre stuff and copies paper, forms the wet fibrage of one deck.Use the Yang Jishi drying cylinder to carry out the wet fibrage of dry gained.Under 130 ℃ and 200kg/cm pressure, carry out hot calendered then and handle, obtain to have the adhesive-bonded fabric structure as semipermeable membrane support material of the present invention.For prepared semipermeable membrane support material, as 1 the method implemented to record basic weight be 65g/m 2, density is 0.71g/cm3, air permeability is 7.01c.c./cm 2/ sec, longitudinal tensile strength are that 6.41kg/15mm, ductility are 10%, and transverse tensile strength is that 5.25kg/15mm, ductility are 10.5%.Vertically/and the transverse tensile strength ratio is 1.22, each data is as shown in table 3.
Comparative example 3
Making semipermeable membrane support material of the present invention as the same way as of embodiment 18, but only use 0.8 red Buddhist nun's polyester staple fiber and sheath core composite short fiber, usage ratio is as shown in table 3, makes as semipermeable membrane support material of the present invention, and recording basic weight is 63g/m 2, density is 0.75g/cm3, air permeability is 13.85c.c./cm 2/ sec, longitudinal tensile strength are that 6.26kg/15mm, ductility are 11%, and transverse tensile strength is that 2.98kg/15mm, ductility are 15.2%.Vertically/and the transverse tensile strength ratio is 2.1, each data is as shown in table 3.
Table 3
Though the present invention with preferred embodiment openly as above, so it is not in order to limit the present invention.Anyly be familiar with this skill person, without departing from the spirit and scope of the present invention, when doing a little change and retouching.Therefore protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.

Claims (9)

1. semipermeable membrane support material is characterized in that comprising:
The polyester staple fiber of 10 to 70 weight %; And this polyester staple fiber is a thermoplastic fibre;
The sheath core composite fibre of 30 to 70 weight %, it is low fusing point that the sheath portion of this sheath core composite fibre has than core, and this sheath core composite fibre is a thermoplastic fibre; And
The polyolefin filaments pulp fibres of 3 to 40 weight %, this polyolefin filaments pulp fibres has 1 to 15m 2The specific area of/g;
Wherein, this polyester staple fiber, this sheath core composite fibre and this polyolefin filaments pulp fibres form the structure of adhesive-bonded fabric; Three's content summation is no more than 100 weight %.
2. semipermeable membrane support material according to claim 1 is characterized in that described fid has air permeability 0.2 to 10c.c./cm 2/ sec.
3. semipermeable membrane support material according to claim 1 is characterized in that described fid has hot strength 5 to 8kg/15mm.
4. semipermeable membrane support material according to claim 1 is characterized in that described fid has in length and breadth to hot strength than 1.5: 1 to 1: 1.
5. semipermeable membrane support material according to claim 1 is characterized in that the sheath portion fusing point of this sheath core composite fibre is low 20 to 150 ℃ than the core fusing point.
6. semipermeable membrane support material according to claim 5 is characterized in that this sheath portion is polyester or polyolefin, and this core is a polyester.
7. the manufacture method of a semipermeable membrane support material is characterized in that comprising:
The polyester staple fiber of 10 to 70 weight portions, the sheath core composite fibre of 30 to 70 weight portions and the polyolefin filaments pulp fibres of 3 to 40 weight portions are dispersed in the water, be made into the fibre stuff of 0.1 to 1.0 weight %, wherein, it is low fusing point that the sheath portion of this sheath core composite fibre has than core, and this polyester staple fiber is a thermoplastic fibre; And this sheath core composite fibre is a thermoplastic fibre;
Carry out wet type for this fibre stuff and copy the paper program, obtain a wet fiber layer; And
With this wet fiber layer drying, and carry out hot calendered and handle, use obtaining this semipermeable membrane support material, it has the adhesive-bonded fabric structure.
8. the manufacture method of semipermeable membrane support material according to claim 7 is characterized in that it is to carry out to copy paper equipment that this wet type is copied the paper program, and this copies paper equipment is fourdrinier wire formula, cylinder or oblique net formula.
9. the manufacture method of semipermeable membrane support material according to claim 7 is characterized in that carrying out hot calendered at the sheath portion fusing point of this sheath core composite fibre to the temperature that is higher than between 50 ℃ of this fusing points handles.
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WO1999018282A1 (en) * 1997-10-08 1999-04-15 Scapa Group Plc Improved industrial fabrics
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US6156680A (en) * 1998-12-23 2000-12-05 Bba Nonwovens Simpsonville, Inc. Reverse osmosis support substrate and method for its manufacture
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61146304A (en) * 1984-12-19 1986-07-04 Daicel Chem Ind Ltd Semipermeable membrane with supporting body
US4728394A (en) * 1985-03-29 1988-03-01 Firma Carl Freudenberg Semipermeable membrane support and process for preparation thereof
US5989432A (en) * 1995-02-14 1999-11-23 Pall Corporation Dynamic supported membrane assembly and method of making and using it
WO1999018282A1 (en) * 1997-10-08 1999-04-15 Scapa Group Plc Improved industrial fabrics
US6156680A (en) * 1998-12-23 2000-12-05 Bba Nonwovens Simpsonville, Inc. Reverse osmosis support substrate and method for its manufacture
US20020056535A1 (en) * 2000-09-22 2002-05-16 Yoshitsugu Hama Semipermeable membrane support and process of preparation thereof

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