CN113351032B - Wet-process non-woven fabric base material and application thereof - Google Patents
Wet-process non-woven fabric base material and application thereof Download PDFInfo
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- CN113351032B CN113351032B CN202110583692.7A CN202110583692A CN113351032B CN 113351032 B CN113351032 B CN 113351032B CN 202110583692 A CN202110583692 A CN 202110583692A CN 113351032 B CN113351032 B CN 113351032B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/26—Polyalkenes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/024—Oxides
- B01D71/027—Silicium oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/30—Chemical resistance
Abstract
The invention discloses a wet-process non-woven fabric base material and application thereof, wherein the wet-process non-woven fabric base material comprises main fibers and reinforcing fibers, the average titer of the main fibers is 0.5-5.0 dtex, the fiber length is 3-10 mm, the average titer of the reinforcing fibers is 1-10 dtex, and the fiber length is 3-50 mm. The main body fiber is combined with the reinforcing fiber, wherein the main body fiber is preferably selected from fibers with lower melting points such as ES fiber or polypropylene fiber, the self-adhesive thermoplastic synthetic fiber has the advantages of small material relative density, high strength, acid resistance, alkali resistance, chemical solvent resistance and the like, and can meet the production characteristics of high acidity, high solvent and high COD of acidic material filtering working conditions and the requirements of membrane module cleaning and regeneration; the reinforced fiber is preferably PPS fiber or glass fiber and the like which have the characteristics of high strength, high temperature resistance and corrosion resistance, so that the non-woven fabric base material produced by combining the PPS fiber and the glass fiber has the characteristics of high stiffness, strong acid resistance and easy film coating.
Description
Technical Field
The invention relates to the technical field of non-woven fabric base materials, in particular to a wet-process non-woven fabric base material and application thereof.
Background
The discharge amount of waste acid in the industries of chemical industry, medicine, dye and the like reaches millions of tons every year, if the waste acid can be recycled, obvious environmental protection and economic benefits are generated, whether the waste acid can be recycled or not is judged, pretreatment is particularly important, and filtration is one of indispensable pretreatment means as a conventional means for removing solid suspended matters. In view of the characteristics of high acidity and high organic content of the system, the medium tolerance of the filter material is the primary consideration for the filter type selection.
The macromolecule asymmetric precision filter material is one of conventional filter materials, is in a common base material form on the market at present, is thicker after being coated with a film by a needled felt, can only be used for components such as a filter bag and the like, and is higher in difficulty in processing into a small-diameter membrane tube; the non-woven fabrics are difficult to add reinforcing fibers due to the adoption of melt-blown non-woven fabrics and spun-bonded non-woven fabrics, the non-woven fabrics are generally poor in tensile strength and cannot meet production requirements, a film layer and base non-woven fabrics are easy to peel off, backwashing and regeneration in production are easy to damage, the types of film base materials in the market at present are more, polyester materials are adopted as supporting layers, the base material performance and reprocessing performance are excellent, but the stability of the non-woven fabrics in high-concentration acid liquor is poor, the application of the non-woven fabrics in acid material filter membranes is limited, fluoroplastic materials are adopted, the film covering performance is poor, the reprocessing process requirement is high, materials such as polypropylene are adopted as base materials, the stiffness is poor, the strength is insufficient, and the pressure of a filter medium easily causes separation membrane to break.
Disclosure of Invention
The invention provides a wet-process non-woven fabric base material and application thereof, aiming at the defects in the background technology.
In order to solve the phenomenon, the invention adopts the following technical scheme that the wet-process non-woven fabric base material comprises main fibers and reinforcing fibers, wherein the average titer of the main fibers is 0.5-5.0 dtex, the fiber length is 3-10 mm, the average titer of the reinforcing fibers is 1-10 dtex, and the fiber length is 3-50 mm.
In a more preferred embodiment of the present invention, the wet laid nonwoven fabric substrate has a thickness of 100 to 500 μm.
In a more preferred embodiment of the present invention, the wet laid nonwoven fabric base has an area density of 50 to 200g/m 2 。
In a more preferred embodiment of the present invention, the wet laid nonwoven fabric has a longitudinal base tension of 50 to 250N/15mm and a transverse base tension of 30 to 150N/15mm.
In a further preferred embodiment of the present invention, the host fiber is an ES fiber or a polypropylene fiber.
In a more preferred embodiment of the present invention, the content of the main fiber is 50 to 95% of the total weight of the nonwoven fabric.
In a further preferred embodiment of the present invention, the reinforcing fiber is a PPS fiber or a glass fiber.
In a more preferred embodiment of the present invention, the content of the reinforcing fiber is 5 to 30% by weight based on the total weight of the nonwoven fabric.
The non-woven fabric base material prepared by the invention has the characteristics of high stiffness, strong acid resistance and easy film coating, and is a film coating base material which can be widely used for filtering films in acidic materials and high-temperature strong acid conditions.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: the wet-process non-woven fabric base material comprises main fibers and reinforcing fibers, wherein the average titer of the main fibers is 0.5-5.0 dtex, the fiber length is 3-10 mm, the average titer of the reinforcing fibers is 1-10 dtex, and the fiber length is 3-50 mm.
The thickness of the wet-process non-woven fabric base material is 100-500 mu m.
The surface density of the wet non-woven fabric substrate is 50 to 200g/m 2 。
The longitudinal substrate tension of the wet-process non-woven fabric is 50-250N/15 mm, and the transverse substrate tension of the wet-process non-woven fabric is 30-150N/15 mm.
The main body fiber is ES fiber or polypropylene fiber.
The content of the main fiber is 50-95% of the total weight of the non-woven fabric.
The reinforced fiber is PPS fiber or glass fiber.
The content of the reinforced fiber is 5-30% of the total weight of the non-woven fabric.
The application method of the wet-process non-woven fabric substrate comprises the following steps:
the main body fibers and the reinforcing fibers are mutually bonded, so that certain strength and stiffness are given to the wet-process non-woven fabric base material. If the selected main fibers are too thin and too long, although the porosity performance of the formed fiber web is excellent, the fibers are easy to intertwine with each other to form flocculation, the dispersibility is poor, the papermaking forming is influenced, and the production difficulty is high; if the selected main body fiber is too thick and too short, the processing difficulty of the ultrashort fiber is high, the processing cost is high, the pores of the cut mesh are thick, and the adhesion performance to the filter membrane is poor. The average titer of the main fiber is 0.5 to 5.0dtex and the fiber length is 3 to 10mm by comprehensively considering the product performance and the economy. The reinforced fiber plays a skeleton supporting role in the wet non-woven fabric base material, and the stiffness and the strength of the base material are improved. This wet process non-woven fabrics substrate need suitably improve the tectorial membrane temperature often when carrying out the tectorial membrane production to guarantee rete adhesion fastness, increase surface finish, the deformation of tectorial membrane in-process wet process non-woven fabrics is wrinkled in the addition of reinforcing fiber can be avoided, the reduction product defective rate. If the fineness of the reinforcing fiber is too low, the performance improvement effect cannot be obtained, and if the fineness is too high, the strength and rigidity of the base material are effectively improved, but the short fiber stands up on the surface of the nonwoven fabric, and burrs are formed, and the adhesive film layer may be damaged. The reinforced fiber is too short, the interlacing points among the fibers are insufficient, the strength cannot meet the requirement, the stiffness of the non-woven fabric base material is reduced, and the product performance cannot meet the requirement of building, forming and processing. In conclusion, the average fineness of the reinforcing fiber is 1 to 10dtex, and the fiber length is 3 to 50mm.
If the content of the main fibers is too low, the bonding of the fibers of the non-woven fabric substrate can not be ensured, and the strength of the non-woven fabric is reduced; if the content is too high, the voids between the fibers on the surface of the wet-laid nonwoven fabric are blocked by the melt of the main fibers during high-temperature coating, and the air permeability of the nonwoven fabric is reduced. The content of the reinforced fiber is low, the wet-process non-woven fabric substrate has insufficient high strength and high stiffness, and the content of the reinforced fiber is too high, so that the product has insufficient flexibility and the folded part of the product is easy to tear. In consideration of strength, stiffness, air permeability and subsequent processing requirements of the product, the content of the main fiber in the present invention is preferably 50 to 95% of the total weight of the nonwoven fabric, and the content of the reinforcing fiber is preferably 5 to 30% of the total weight of the nonwoven fabric.
Based on test data, the surface density is 50-200 g/m 2 The strength of the product can meet the requirement. The gram weight is too low, and the strength of the base material is insufficient; the gram weight is too high, the sorting phenomenon is obvious when the short fibers are formed into a net, the consistency of the non-woven fabric base material is poor, the strength is too high, and the reprocessing performance of the base material after film coating is poor. Preferably, the areal density is 50 to 200g/m 2 The thickness of the base material after double-sided calendering is 100-500 mu m, the tensile force of the base material is 50-250N/15 mm (longitudinal direction), and 30-150N/15 mm (transverse direction).
Example one
The invention provides a technical scheme that: a wet-process non-woven fabric base material with fineness of1dtex, ES short fiber with length of 3mm (skin-core structure, PP: PE = 50) was beaten to a pulp with solid content of 0.05%, to obtain a dry weight of 70g/m 2 The technical performance indexes of the wet-process non-woven fabric are shown in the table 1.
Example two
The invention provides a technical scheme that: a wet-process nonwoven fabric substrate was prepared by beating ES staple fibers (sheath-core structure, PP: PE =50 2 The technical performance indexes of the wet-process non-woven fabric are shown in the table 1.
Example three
The invention provides a technical scheme that: a wet-process nonwoven fabric substrate was prepared by beating ES staple fibers (sheath-core structure, PP: PE = 50) 2 The technical performance indexes of the wet-process non-woven fabric are shown in table 1.
Example four
The invention provides a technical scheme that: a wet-process non-woven fabric base material is prepared by putting 90% by mass of ES short fiber (sheath-core structure, PP: PE = 50) with the fineness of 1dtex and the length of 3mm and 10% by mass of PPS short fiber with the fineness of 2.2dtex and the length of 6mm into a beating machine for mixing and beating to obtain a product with the gram weight of 70g/m 2 And (3) wet-process non-woven fabric. The relevant technical performance indexes are shown in table 1.
Example five
The invention provides a technical scheme that: a wet-process non-woven fabric base material is prepared by putting 85 mass percent of ES short fiber (sheath-core structure, PP: PE = 50) with the fiber degree of 1dtex and the length of 5mm and 15 mass percent of PPS short fiber with the fiber degree of 2.2dtex and the length of 6mm into a beater to be mixed and beaten to obtain a mixture with the gram weight of 85g/m 2 And (3) wet-process non-woven fabrics. The relevant technical performance indexes are shown in table 1.
Example six
The invention provides a technical scheme that: a wet-process nonwoven fabric substrate was prepared by mixing 90% by mass of ES short fibers (sheath-core structure, PP: PE = 50) having a fiber length of 1dtex and a length of 3mm, with 10% by mass of glass fibers having a fiber length of 0.7dtex and a length of 6mmThe fiber short fibers are put into a beater to be mixed and beaten to obtain the product with the gram weight of 70g/m 2 And (3) wet-process non-woven fabrics. The relevant technical performance indexes are shown in table 1.
Example seven
The invention provides a technical scheme that: a wet-process non-woven fabric substrate is prepared by putting 85 mass percent of ES short fibers (sheath-core structure, PP: PE = 50) with the fiber degree of 1dtex and the length of 5mm and glass fiber short fibers with the mass percent of 15, the fiber degree of 1.6dtex and the length of 12mm into a beater to be mixed and beaten to obtain a glass fiber substrate with the gram weight of 85g/m 2 And (3) wet-process non-woven fabric. The relevant technical performance indexes are shown in table 1.
The parameter table of the non-woven fabric substrate of the invention is as follows:
TABLE 1
In conclusion, the main body fiber is combined with the reinforcing fiber, wherein the main body fiber is preferably ES fiber or polypropylene fiber and other fibers with lower melting points, the self-adhesive thermoplastic synthetic fiber has the advantages of small material relative density, high strength, acid resistance, alkali resistance, chemical solvent resistance and the like, and can meet the production characteristics of high acidity, high solvent and high COD of acidic material filtration working conditions and the cleaning and regeneration requirements of a membrane component; the reinforced fiber is preferably PPS fiber or glass fiber and the like which have the material characteristics of high strength, high temperature resistance and corrosion resistance, so that the non-woven fabric base material produced by combining the PPS fiber and the glass fiber has the characteristics of high stiffness, strong acid resistance and easy film coating, and is a film coating base material which can be widely used for filtering films in acidic materials and high-temperature strong acid conditions.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other embodiments without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description of the embodiments is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. The wet-process non-woven fabric base material is characterized by comprising main fibers and reinforcing fibers, wherein the average titer of the main fibers is 0.5-5.0 dtex, the fiber length is 3-10 mm, the average titer of the reinforcing fibers is 1-10 dtex, and the fiber length is 3-50 mm; the main fiber accounts for 85-90% of the total weight of the non-woven fabric, the reinforcing fiber accounts for 10-15% of the total weight of the non-woven fabric, the main fiber is ES fiber or polypropylene fiber, and the reinforcing fiber is PPS fiber or glass fiber.
2. The wet laid nonwoven fabric substrate according to claim 1, wherein the wet laid nonwoven fabric substrate has a thickness of 100 μm to 500 μm.
3. The wet laid nonwoven fabric substrate as claimed in claim 1, wherein the wet laid nonwoven fabric substrate has an areal density of 50 to 200g/m 2 。
4. The wet-process non-woven fabric substrate according to claim 1, wherein the longitudinal substrate tension of the wet-process non-woven fabric is 50-250N/15 mm, and the transverse substrate tension of the wet-process non-woven fabric is 30-150N/15 mm.
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| CN202110583692.7A CN113351032B (en) | 2021-05-27 | 2021-05-27 | Wet-process non-woven fabric base material and application thereof |
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| CN113351032B true CN113351032B (en) | 2023-04-07 |
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| US7138023B2 (en) * | 2003-10-17 | 2006-11-21 | Owens-Corning Fiberglas Technology, Inc. | Development of thermoplastic composites using wet use chopped strand (WUCS) |
| EP1950333A4 (en) * | 2005-11-15 | 2011-12-21 | Kinsei Seishi Co Ltd | Air-laid sheet for food extraction |
| CN100457995C (en) * | 2005-12-29 | 2009-02-04 | 中材科技股份有限公司 | Method of preparing fiber reinforcement thermoplastic plastics felt premixed material by stitch-bonding method |
| JP6420663B2 (en) * | 2012-07-30 | 2018-11-07 | 株式会社クラレ | Heat resistant resin composite, method for producing the same, and nonwoven fabric for heat resistant resin composite |
| ES2646713T3 (en) * | 2012-10-02 | 2017-12-15 | Reifenhäuser GmbH & Co. KG Maschinenfabrik | Process for manufacturing a composite molded part, in particular a molded part composed of fibers, and composite molded part, in particular molded part composed of fibers |
| JP7032963B2 (en) * | 2018-03-12 | 2022-03-09 | 呉羽テック株式会社 | Filter reinforcing material and filter material for deodorizing filter including this |
| CN108708070A (en) * | 2018-07-11 | 2018-10-26 | 河北科技大学 | A kind of multidirectional support construction material of macromolecule composite self-adhering fiber |
| CN110743381B (en) * | 2019-11-08 | 2023-03-14 | 株洲时代华先材料科技有限公司 | Membrane substrate, separation membrane and preparation method thereof |
| CN111020876B (en) * | 2019-12-30 | 2022-04-05 | 南通大学 | High-efficiency filtering material with gradient structure and production method thereof |
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