CN115503310A - Hydrophilic melt-blown nonwoven fabric, laminate comprising same, and application thereof - Google Patents

Hydrophilic melt-blown nonwoven fabric, laminate comprising same, and application thereof Download PDF

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Publication number
CN115503310A
CN115503310A CN202110698224.4A CN202110698224A CN115503310A CN 115503310 A CN115503310 A CN 115503310A CN 202110698224 A CN202110698224 A CN 202110698224A CN 115503310 A CN115503310 A CN 115503310A
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hydrophilic
melt
blown
fibers
nonwoven fabric
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甄光明
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/026—Knitted fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/08—Animal fibres, e.g. hair, wool, silk
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/728—Hydrophilic

Abstract

The invention provides a hydrophilic melt-blown nonwoven fabric, a laminate containing the same and application thereof. The hydrophilic melt-blown nonwoven fabric has: the fiber comprises a plurality of melt-blown fibers adhered to each other and a plurality of holes formed among the melt-blown fibers, wherein the melt-blown fibers are made of hydrophilic materials, the hydrophilic materials have biodegradability, and the average pore diameter of the holes is 0.1-10 microns. The hydrophilic melt-blown non-woven fabric is formed by using a hydrophilic material, so that hydrogen bonds among water molecules in contact with the hydrophilic melt-blown non-woven fabric can be destroyed, the water molecules can not be mutually aggregated to form water drops and can pass through the holes, and fine particles with the particle size larger than the holes are blocked on the holes, so that the effect of filtering the fine particles in the water body without applying additional pressure is achieved.

Description

Hydrophilic melt-blown nonwoven fabric, laminate comprising same, and application thereof
Technical Field
The invention relates to a non-woven fabric, in particular to a melt-blown non-woven fabric. Also relates to a laminate comprising the same and application thereof.
Background
There are often fine particles in the water body of about 0.1 micrometers (μm) to 20 μm, and it is often necessary to separate the fine particles from the water for the purpose of purifying the water or other purposes.
Because the particle size of the fine particles is small, the melt-blown non-woven fabric with narrow holes is selected for filtering. However, the present melt-blown nonwoven fabrics in the market are all made of non-polar hydrophobic plastics such as polypropylene (PP), polyethylene (PE), or polyethylene terephthalate (PET) through a melt-blowing process, so that when minute particles in a water body are to be separated, water molecules in the water body form micro water drops due to cohesion, and water and objects to be separated (i.e., minute particles) in the water body cannot pass through the holes of the melt-blown nonwoven fabrics, and thus the purpose of filtering is not easily achieved without applying additional pressure.
The additional application of pressure to filter fine particles consumes additional energy and, while reducing the filtration time, accelerates the clogging of the filter pores. In addition, the above-mentioned hydrophobic plastics such as PP, PE, and PET are difficult to naturally degrade and are likely to cause environmental problems. Therefore, there is a need for an environmentally friendly filter material that can filter fine particles in water without applying additional pressure, is not prone to blocking pores, can prolong the service life, and is easy to degrade in the natural environment when discarded.
Disclosure of Invention
In view of the defect that the melt-blown nonwoven fabric in the prior art cannot be effectively used for filtering fine particles in a water body, the invention provides the hydrophilic melt-blown nonwoven fabric, which can achieve the purpose of enabling water molecules to pass through, and further can enable the water molecules to pass through a plurality of holes formed by melt-blown fibers under the natural gravity without additional applied pressure, so that the fine particles in the water can be effectively filtered, the energy can be effectively saved, the filtering time can be prolonged, additional power pressurization is not needed, and the energy consumption is not needed. When the hydrophilic melt-blown non-woven fabric is used as a filter material, the service life can be prolonged, and the hydrophilic melt-blown non-woven fabric has biological degradability, so that the hydrophilic melt-blown non-woven fabric is easier to decompose in a natural environment compared with other plastic non-woven fabrics, and the environmental problem can be reduced when the hydrophilic melt-blown non-woven fabric is discarded.
To achieve the above object, the present invention provides a hydrophilic melt-blown nonwoven fabric comprising: the fiber comprises a plurality of melt-blown fibers adhered to each other and a plurality of holes formed among the melt-blown fibers, wherein the melt-blown fibers are made of a hydrophilic material, the hydrophilic material has biodegradability, and the average pore diameter of the holes is 0.1-10 mu m.
When the hydrophilic melt-blown non-woven fabric is used for filtering fine particles in water, the melt-blown non-woven fabric is made of hydrophilic materials, so that hydrogen bonds among water molecules can be destroyed when the water molecules in the water body are contacted with the water molecules, the water molecules can not be mutually aggregated to form water drops and can pass through a plurality of holes formed among a plurality of melt-blown fibers, and meanwhile, fine particles with the particle size larger than the plurality of holes can be blocked on the plurality of holes, so that the effect of filtering the fine particles in the water body without applying additional pressure can be achieved. Moreover, because the hydrophilic melt-blown non-woven fabric is made of a material with biodegradability, the hydrophilic melt-blown non-woven fabric can be degraded in the natural environment when being discarded, thereby meeting the requirement of environmental protection.
Preferably, the material of the meltblown fibers, i.e. the hydrophilic material, includes: polylactic acid (PLA), polyglycolic acid (PGA), polybutylene adipate terephthalate (PBAT), and combinations thereof. Since PLA and PGA are biodegradable materials, when the holes of the meltblown nonwoven fabric are clogged and the filtering effect is reduced, the hydrophilic meltblown nonwoven fabric made of PLA and PGA can be naturally decomposed without causing environmental problems.
According to the invention, 95% to 99.9% of the high optical purity PLA has a melting point of 160 ℃ to 180 ℃; the melting point of the medium optical purity PLA is 130 ℃ to 160 ℃; the melting point of 90% of low optical purity is 110 ℃ to 130 ℃.
According to the present invention, the hydrophilic material is a material having a polar property. Preferably, the hydrophilic material has an electric dipole moment (dipolement) of μ >0.
In one embodiment of the present invention, the average pore diameter of the plurality of pores formed between the meltblown fibers is 0.1 μm to 5 μm. More preferably, the average pore size of the plurality of pores formed between the meltblown fibers is 0.1 μm to 2 μm, and still more preferably, the average pore size of the plurality of pores formed between the individual meltblown fibers is 0.5 μm to 2 μm. Still more preferably, the average pore size of the plurality of pores formed between the meltblown fibers is 0.2 μm to 0.8. Mu.m. Since the smallest algae, chlorella sp, has a diameter of about 2 to 5 μm, the hydrophilic meltblown nonwoven fabric having the above average pore size can be used to filter and collect algae, pass water molecules through the plurality of pores of the hydrophilic meltblown nonwoven fabric, and block the algae from the plurality of pores.
In one embodiment of the present invention, the average pore diameter of the plurality of pores formed between the meltblown fibers is 0.1 μm to 0.22 μm. Since the size of bacteria is generally greater than 0.22 μm, the hydrophilic meltblown nonwoven fabric having the above-mentioned average pore size can be used to filter bacteria in water.
The present invention also provides a laminate comprising: the hydrophilic melt-blown nonwoven fabric and a primary backing fabric; the hydrophilic melt-blown nonwoven fabric is formed on the base fabric; wherein the base cloth is formed by a plurality of hydrophilic fibers, the hydrophilic fibers have biodegradability, and the average pore diameter of a plurality of pores formed by the hydrophilic fibers is 50-100 μm. Since the primary backing is formed of hydrophilic and biodegradable fibers, the laminate can pass water molecules and is easily decomposed in the natural environment even when it is damaged and used, thereby reducing environmental problems.
Preferably, the hydrophilic fiber is a natural fiber. For example: vegetable fibers, animal wool fibers and mineral fibers. And plant fibers include, but are not limited to, cotton or hemp. Once the base cloth is used, the base cloth can be naturally decomposed by microorganisms without causing environmental problems when the filtering effect of the laminated body is reduced or the laminated body is damaged and cannot be used. In one embodiment, the base fabric may be a woven fabric formed by interweaving a plurality of hydrophilic fibers, and the base fabric may be in the form of woven fabric or knitted fabric, but is not limited thereto. In another aspect, the primary backing may be a nonwoven fabric, and the nonwoven fabric may be, but is not limited to, a spunbonded nonwoven fabric or a heat-sealable nonwoven fabric.
The invention also provides the application of the hydrophilic melt-blown non-woven fabric, which is used for purifying water quality or filtering fine particles.
The invention further provides application of the hydrophilic melt-blown non-woven fabric, which is used for separating algae in water. Preferably, the algae are microalgae (microalgae). For example: chlorella vulgaris having a diameter of about 2 μm to 5 μm.
The invention also provides the application of the laminated body, which is used for purifying water quality or filtering fine particles.
The invention also provides the application of the laminated body, which is used for separating algae in water. Preferably, the algae are microalgae. For example: chlorella vulgaris having a diameter of about 2 μm to 5 μm.
The invention has the advantages that the hydrophilic melt-blown non-woven fabric or the laminated body containing the hydrophilic melt-blown non-woven fabric is prepared by the hydrophilic material through melt-blowing, so that hydrogen bonds between water molecules can be destroyed when the water molecules in the water body are contacted with the water molecules, the water molecules can not mutually gather to form water drops and can pass through a plurality of holes formed among a plurality of melt-blown fibers, and meanwhile, fine particles with the particle size larger than the plurality of holes can be blocked on the plurality of holes, so that the effect of filtering the fine particles in the water body without additionally applying pressure can be achieved, energy can be saved, and the service life of the filter material can be prolonged. When the hydrophilic material is biodegradable material such as PLA or PGA, the melt-blown nonwoven fabric can be naturally decomposed without causing environmental problems under the condition that the filtering effect is reduced or the nonwoven fabric is damaged.
In addition, according to the invention, the hydrophilic material is made into the hydrophilic melt-blown non-woven fabric or the laminate containing the hydrophilic melt-blown non-woven fabric by melt-blowing, not only can be used for filtering fine particles, but also can be used for collecting or removing harmful microorganisms and the like from microalgae in a water body, and the application range is wide.
Drawings
FIG. 1 is a graph showing the average filtration amount (right Y axis) and the cumulative filtration amount (left Y axis) of the filtration effect of the hydrophilic meltblown nonwoven fabric of preparation example 1A.
FIG. 2 is a graph showing the relationship between the time for filtering the chlorella-containing aqueous solution and the percentage of the amount filtered, according to preparation example 1A, using a hydrophilic meltblown nonwoven fabric.
FIG. 3A is a 400-fold magnified microscopic image of an aqueous solution containing Chlorella.
FIG. 3B is a 400-fold microscopic image of Chlorella in the filtrate of the aqueous solution containing Chlorella filtered through the hydrophilic melt-blown nonwoven fabric of preparation example 1A.
FIG. 4 is a graph showing the average filtration amount (right Y axis) and the cumulative filtration amount (left Y axis) of the filtration effect of the hydrophilic meltblown nonwoven fabric of preparation example 1B.
FIG. 5 is a graph showing the relationship between the time and the filtration amount percentage of the hydrophilic meltblown nonwoven fabric used for filtering the chlorella-containing aqueous solution according to preparation example 1B.
FIG. 6A is a 400-fold magnified microscopic image of an aqueous solution containing Chlorella.
FIG. 6B is a magnified 400-fold microscopic image of Chlorella in a filtrate of an aqueous solution containing Chlorella filtered through the hydrophilic meltblown nonwoven fabric of preparation example 1B.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
The invention is further illustrated by the following examples, which are not intended to limit the invention as disclosed herein. Those skilled in the art may make various modifications and alterations without departing from the scope of the present invention.
Preparation examples 1A and 1B: hydrophilic melt-blown nonwoven fabric
Making the hydrophilic material: the PLA being melted at high temperature (about 180 ℃ C.) to form a molten stateThe polylactic acid enters a flow passage of a melt-blown die head, is uniformly distributed and then enters a spinneret plate, and is sprayed by high-temperature, high-speed and high-pressure hot air to form a plurality of melt-blown fibers, the melt-blown fibers are adhered to each other and stacked to form a net shape, and the net shape is respectively processed by different existing processing technologies to obtain the cloth with the weight of 57g/m 2 Preparation example 1A hydrophilic melt-blown nonwoven fabric, and a fabric weight of 40g/m 2 Preparation example 1B hydrophilic meltblown nonwoven fabric. The hydrophilic meltblown nonwoven fabrics of preparation examples 1A and 1B were used to collect algae in a water body because about 90% of the pores, having a pore diameter of 0.5 μm and an average pore diameter of 0.5 μm, were smaller than the smallest algae-chlorella and larger than the size of one water molecule (about 0.28 nm). Since polylactic acid is biodegradable, once the melt-blown nonwoven fabric is damaged and used, it is easily decomposed in the natural environment without causing environmental problems.
Test example 1: chlorella filtering capability of melt-blown non-woven fabric
The hydrophilic meltblown nonwoven fabrics of preparation examples 1A and 1B and a 500-mesh metal mesh (average pore size of 25 μm) as a comparative example were tested for their ability to filter an aqueous chlorella-containing solution.
First, the hydrophilic melt-blown nonwoven fabrics of preparation examples 1A and 1B were cut into 4 pieces each having a length and a width of 10 cm, and folded into a funnel shape to be completely fitted to a glass funnel, and a connection tube of the glass funnel was brought into contact with the wall of a quantitative cylinder, so that the aqueous solution containing chlorella smoothly flowed into the quantitative cylinder. The filtration elapsed time and the amount of filtration per unit time (1-15, 30, 60, 80, 140 minutes) were recorded. After waiting for the filtration to stop, the last time was recorded and the filtrate was analyzed for chlorella concentration with a chlorella chlorophyll concentration analyzer (FluoroProbe, bbe Moldaenke, germany).
The efficiency of harvesting chlorella from the melt-blown non-woven fabric is as follows: (1-C) t /C 0 ) x100% where C t The cell concentration of chlorella in the filtered filtrate C 0 The cell concentration of the original chlorella-containing aqueous solution.
In addition, the aqueous solution containing chlorella was poured into the 500 mesh metal screen of comparative example for filtration, but even if the holes are larger than the size of a single chlorella, the aqueous solution containing chlorella instantly blocks all the holes of the screen and filtration could not be performed because the 500 mesh metal screen had a single layer of uniform holes.
Therefore, only the filtration results of the hydrophilic meltblown nonwoven fabrics of preparation examples 1A and 1B were recorded, wherein the yield of chlorella of the hydrophilic meltblown nonwoven fabric of preparation example 1A was 68.46% ± 1.83%. Referring to fig. 1, the average filtration amount of the hydrophilic meltblown nonwoven fabric of preparation example 1A was maximum at 1 minute of filtration, about 3.2 milliliters per minute (ml/min), and then gradually decreased, and the average filtration amount was only 20% of 1 minute and about 0.6ml/min at 8 minutes. While the cumulative filtration volume also showed a gradual increase after 8 minutes. Referring again to fig. 2, the total filtration reached 64.17% when the entire set of experiments was run for 10 minutes, and about 80 minutes was required for the total filtrate to reach 95%. As a result of observing the aqueous solution containing chlorella before and after filtration with a 400-fold microscope, the amount of chlorella in the filtrate of FIG. 3B was significantly reduced, as shown in FIGS. 3A and 3B, since chlorella was indeed filtered by the hydrophilic meltblown nonwoven fabric of preparation example 1A.
While the chlorella harvest rate of the hydrophilic melt-blown nonwoven fabric of preparation example 1B was 88.76% ± 7.5%. Referring to FIG. 4, the average filtration capacity of the hydrophilic meltblown nonwoven fabric of preparation example 1B was maximum at 3 minutes before filtration and was about 1.2ml/min, and then gradually decreased until 12 minutes, where the average filtration capacity was only 20% of the filtration capacity at the first 3 minutes and was about 0.25ml/min. Referring again to fig. 5, the total filtration reached 44.17% when the entire set of experiments were performed for 10 minutes, and about 140 minutes when the total filtrate reached 95%. As a result of observing the filtrate before and after filtration with a 400-fold microscope, the results are shown in FIGS. 6A and 6B, respectively, and the amount of chlorella in the filtrate of FIG. 6B was significantly reduced when the chlorella was actually filtered by the hydrophilic melt-blown nonwoven fabric of preparation example 1B.
Thus, this example demonstrates that the hydrophilic meltblown nonwoven fabric of the present invention does filter chlorella and is superior to a non-filtering, immediately plugged 500 mesh metal screen.
Preparation example 2: laminate comprising hydrophilic melt-blown nonwoven fabric
Firstly, preparing a primary backing cloth; the primary backing is formed by interweaving a plurality of natural fibers, and the primary backing has a plurality of holes formed by the plurality of natural fibers, and the average diameter of the plurality of holes formed by the plurality of natural fibers is 50 μm to 100 μm. Then, preparing a hydrophilic material, namely polylactic acid; the polylactic acid in a molten state formed by melting the polylactic acid at high temperature enters a flow channel of a melt-blown die head, is uniformly distributed and then enters a spinneret plate, and is sprayed by high-temperature, high-speed and high-pressure hot air to form a plurality of melt-blown fibers on the primary backing, so that the melt-blown non-woven fabric laminated body is formed. The plurality of melt blown fibers on the primary backing are adhered to each other and intertwined to form a web-like stack, wherein a plurality of holes are formed between the melt blown fibers, and about 90% of the holes have a hole diameter of 0.5 μm and an average diameter of 0.5 μm.
The invention uses the hydrophilic material to melt and spray to prepare the hydrophilic melt-spraying non-woven fabric or the laminated body containing the hydrophilic melt-spraying non-woven fabric, so when the invention is used for separating fine particles from water, the melt-spraying non-woven fabric is made of the hydrophilic material, when water molecules in water contact with the water molecules, hydrogen bonds between the water molecules can be destroyed, the water molecules can not mutually gather to form water drops and can pass through a plurality of holes formed among a plurality of melt-spraying fibers, and meanwhile, the fine particles with the particle size larger than the plurality of holes can be blocked on the plurality of holes, thereby achieving the effects of collecting and algae by filtering the fine particles in the water without applying pressure, and having longer service life compared with a filter material which needs applying pressure. And the biodegradable materials such as PLA or PGA are matched and selected as hydrophilic materials, so that the melt-blown non-woven fabric can be naturally decomposed without causing environmental problems under the condition of reducing or damaging the filtering effect.
The above description is only for the purpose of illustrating a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the claims.
Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the scope and spirit of this invention. While the invention has been described in connection with specific preferred embodiments, it is to be understood that the invention is not to be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in the art are intended to be within the scope of the following claims.

Claims (10)

1. A hydrophilic meltblown nonwoven fabric having: the fiber comprises a plurality of melt-blown fibers adhered to each other and a plurality of holes formed among the melt-blown fibers, wherein the melt-blown fibers are made of hydrophilic materials, the hydrophilic materials have biodegradability, and the average pore diameter of the holes is 0.1-10 microns.
2. The hydrophilic meltblown nonwoven according to claim 1, wherein the hydrophilic material comprises: polylactic acid, polyglycolic acid, or a combination thereof.
3. The hydrophilic meltblown nonwoven according to claim 1 or 2, wherein the pores have an average pore size of 0.1 to 2 microns.
4. A laminate, comprising: a hydrophilic melt-blown nonwoven fabric according to claim 1 or 2, and a primary backing; the hydrophilic melt-blown nonwoven fabric is formed on the base fabric; wherein the base cloth is formed by interweaving a plurality of hydrophilic fibers, the hydrophilic fibers have biodegradability, and the average pore diameter of a plurality of pores formed by the hydrophilic fibers is 50-100 microns.
5. A laminate, comprising: a hydrophilic meltblown nonwoven fabric according to claim 3, and a primary backing; the hydrophilic melt-blown nonwoven fabric is formed on the base fabric; wherein the base fabric is formed by interweaving a plurality of hydrophilic fibers, the hydrophilic fibers have biodegradability, and the average pore diameter of a plurality of pores formed by the hydrophilic fibers is 50-100 micrometers.
6. The laminate according to claim 5, wherein said hydrophilic fibers are natural fibers.
7. Use of the hydrophilic meltblown nonwoven according to any of claims 1 to 3 for purifying water.
8. Use of the hydrophilic meltblown nonwoven fabric of claim 3 for separating microalgae in water.
9. Use of the laminate as claimed in claim 4 or 5 for purifying water.
10. Use of a laminate as defined in claim 5 for the separation of microalgae in water.
CN202110698224.4A 2021-06-23 2021-06-23 Hydrophilic melt-blown nonwoven fabric, laminate comprising same, and application thereof Pending CN115503310A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101824708A (en) * 2010-05-10 2010-09-08 豆丁乐园（南京）婴儿用品有限公司 Fully-degradable polylactic acid fiber melt-blowing nonwoven and preparation method thereof
CN102917777A (en) * 2010-06-03 2013-02-06 帝斯曼知识产权资产管理有限公司 Membrane suitable for blood filtration

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101824708A (en) * 2010-05-10 2010-09-08 豆丁乐园（南京）婴儿用品有限公司 Fully-degradable polylactic acid fiber melt-blowing nonwoven and preparation method thereof
CN102917777A (en) * 2010-06-03 2013-02-06 帝斯曼知识产权资产管理有限公司 Membrane suitable for blood filtration

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