CN111593482A - Treatment method of waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for mask - Google Patents
Treatment method of waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for mask Download PDFInfo
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- 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
- D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/492—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
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- 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
- D04H1/4282—Addition polymers
- D04H1/4291—Olefin series
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- 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
- D04H1/559—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 the fibres being within layered webs
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B15/00—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/244—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons
- D06M15/256—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons containing fluorine
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/70—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment combined with mechanical treatment
- D06M15/71—Cooling; Steaming or heating, e.g. in fluidised beds; with molten metals
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
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- Nonwoven Fabrics (AREA)
Abstract
The invention provides a treatment method of a waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for a mask, which comprises the steps of carrying out melt spinning on polypropylene slices to obtain fibers, then carrying out split yarn laying on the fibers to form a net, carrying out spunlace fiber opening and net fixing to obtain pre-bonded non-woven fabric, then soaking the pre-bonded non-woven fabric in low-concentration polytetrafluoroethylene emulsion, carrying out rolling and blowing to obtain pre-treated spunbonded non-woven fabric S, then carrying out superposition to form an S-M-S structure by taking melt-blown fabric subjected to electret treatment as a meltblown M layer, and finally carrying out rolling and winding to obtain the waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask. According to the method provided by the invention, the spunlace fiber-opening and net-fixing method is utilized to obtain the spunbonded non-woven fabric S with better air permeability, the low-concentration polytetrafluoroethylene emulsion is used for soaking and strong air flow is used for blowing, the hydrophobicity and the air permeability of the non-woven fabric are improved, and the non-woven fabric is further compounded with the melt-blown fabric subjected to electret treatment to obtain the composite non-woven fabric with better waterproof and air permeability, so that the non-woven fabric can be widely used for protective masks.
Description
Technical Field
The invention relates to the technical field of protective masks, in particular to a method for processing waterproof breathable spunbonded-meltblown-spunbonded non-woven fabrics for a mask.
Background
The protective mask mainly has the function of preventing external foreign matters such as particles, dust, bacteria, viruses and the like from entering a human body through a respiratory tract. At present, most masks are made of non-woven fabrics, so that the mask is low in cost, good in protection effect and widely applied. However, with the improvement of the protection requirement, the requirement for the filtering performance of the mask is continuously improved, and the common non-woven fabric cannot meet the requirement. In particular, recent new types of coronavirus have been abused with pneumonia, and the use of personal protective masks has received unprecedented attention.
In the material of the protective mask, the melt-blown cloth is used for the spun-bonded interlayer, so that the filtering effect is greatly improved. For example, the spun-bonded-melt blown-spun-bonded (SMS) is a composite product of spun-bonded and melt blown, has the advantages of high strength, good filtering performance, no adhesive, no toxicity and the like, and is very suitable for medical masks. The melt-blown cloth is the most important filtering material in the current medical mask, is mainly a non-woven fabric with a micro pore passage formed by spraying high-melt-index PP on a cooling roller through high-speed hot air flow under a melt and bonding, and has the characteristics of small pore, high porosity, high filtering efficiency, small unit volume mass and the like, so the development and application of the melt-blown cloth are widely concerned.
In order to improve the filterability of the meltblown fabric, electret treatment is mainly adopted at present, fibers are subjected to electrostatic charge through corona charging, and the meltblown fabric subjected to electrostatic electret treatment can adsorb and restrain fine particles and bacteria under the action of static electricity. However, since the mask is used in a wet environment of breathing, static electricity generated by electret treatment is easily lost in the wet environment. The technical method for improving the hydrophobic and waterproof effects of the mask by coating treatment in the prior art is easy to cause the reduction of the air permeability of the mask and influence the breathing comfort.
Chinese patent application No. 201710586160.2 discloses a method for manufacturing an SMS type non-woven fabric, comprising: mixing the spunbonded raw material polypropylene and the spunbonded master batch, extruding and melting, spinning, dividing and lapping to obtain a spunbonded layer fiber web; mixing, extruding and melting, spinning and lapping the melt-blown raw material modified polypropylene and the master batch for melt-blowing to obtain a melt-blown layer fiber web; and (3) taking the melt-blown layer fiber web as a middle layer and the spunbond layer fiber web as an upper layer and a lower layer, and carrying out hot-pressing bonding on the three layers of fiber webs to obtain the SMS type non-woven fabric. Chinese patent application No. 201120315021.4 discloses an SMS composite non-woven fabric, which comprises an upper surface layer, a lower surface layer and a middle interlayer, wherein the upper surface layer and the lower surface layer are spun-bonded non-woven fabric layers made of polypropylene materials, the middle interlayer is a melt-blown fiber layer, and the fiber diameter of the melt-blown fiber layer is 2-5 mu m.
In order to effectively solve the problem that static electricity easily subjected to electret treatment in a wet environment disappears when the spunbonded-meltblown-spunbonded (SMS) composite non-woven fabric is used for a protective mask and simultaneously avoid the defect that the air permeability of the mask is affected by coating a hydrophobic layer, a novel spunbonded-meltblown-spunbonded non-woven fabric treatment method is needed to be provided, and the composite non-woven fabric is endowed with good waterproof air permeability.
Disclosure of Invention
Aiming at the problem that the existing spunbonded-meltblown-spunbonded (SMS) composite non-woven fabric used for the mask has good barrier and filtration effects and waterproof effects, but the mask is not comfortable due to the fact that the hydrophobic coating is coated to influence air permeability, the invention provides a treatment method of the waterproof air-permeable spunbonded-meltblown-spunbonded non-woven fabric used for the mask, and therefore the waterproof air permeability of the spunbonded-meltblown-spunbonded non-woven fabric is improved.
In order to solve the problems, the invention adopts the following technical scheme:
a treatment method of a waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for a mask comprises the steps of carrying out melt spinning on polypropylene slices to obtain fibers, then carrying out split-filament laying on the fibers to form a net, carrying out spunlace fiber splitting and net fixing to obtain pre-bonded non-woven fabric, then soaking the pre-bonded non-woven fabric in low-concentration polytetrafluoroethylene emulsion, carrying out rolling and blowing to obtain pre-treated spunbonded non-woven fabric S, then using the melt-blown fabric subjected to electret treatment as a melt-blown M layer to form an S-M-S structure in a superposed mode, and finally carrying out rolling and winding to obtain the waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask. The specific treatment method comprises the following steps:
(1) extruding and melting a polypropylene slice by a screw to form a melt, filtering the melt by a filter, spraying the melt through a spinning plate under the action of pressure for spinning, cooling by cold air, and drafting by air flow to obtain fibers;
(2) dividing and overlaying fibers into a net, then carrying out spunlace fiber opening and net fixing to obtain pre-bonded non-woven fabric, conveying the pre-bonded non-woven fabric soaked with low-concentration polytetrafluoroethylene emulsion through a roller, rolling, then carrying out continuous and uniform blowing and drying treatment on the pre-bonded non-woven fabric soaked with the polytetrafluoroethylene emulsion through a hot strong airflow blowing and drying chamber to ensure that the emulsion is uniformly attached to the fibers of the pre-bonded non-woven fabric and good air permeability is kept, and then coiling to obtain pre-treated spun-bonded non-woven fabric S;
(3) performing electret treatment on the melt-blown fabric to form a melt-blown M layer, then laminating the melt-blown M layer with pretreated spun-bonded non-woven fabric S to form an S-M-S structure, performing hot rolling forming, and then winding by using a winding machine to obtain the waterproof breathable spunbond-melt-blown-spunbond non-woven fabric for the mask.
Preferably, the polypropylene chip in the step (1) is S1004 spinning grade PP.
Preferably, the speed of the drawing in the step (1) is controlled to be 800-.
Preferably, the water jet pressure of the water jet for water jet opening the fiber-reinforced web in the step (2) is 30-40kg/cm2The aperture is 0.2-0.3mm, the water temperature is 20-50 ℃, the frequency of a spunlace pump is 30-50Hz, and the linear density of the opened fiber is 0.06-0.08 dtex.
Preferably, the mass concentration of the low-concentration polytetrafluoroethylene emulsion in the step (2) is 2-3%.
Preferably, the temperature of hot air flow in the strong air flow blowing chamber in the step (2) is 80-90 ℃, and the pressure of the air flow is 0.06-0.08 MPa.
Preferably, the pre-treated spunbond nonwoven fabric S in the step (2) has a basis weight of 15 to 18 g/m2。
Preferably, the melt-blown fabric in step (3) is quantified by10-12g /m2。
Preferably, the voltage of the electret treatment in the step (3) is 40-55kV, and the time is 25-40 s.
Preferably, the hot rolling forming in the step (3) adopts flat plate hot rolling, the temperature is 130-140 ℃, the pressure is 3-4MPa, and the time is 10-18 s.
Publicly known, the melt-blown cloth after electret treatment can adsorb and restrain fine particles and bacteria, the filtering effect is good, and the waterproof effect can be obviously improved after the hydrophobic layer is coated. Therefore, the spun-bonded-melt-blown-spun-bonded (SMS) composite non-woven fabric prepared by taking the electret treated melt-blown fabric as the raw material has good blocking and filtering effects when being used for the mask, but when the SMS composite non-woven fabric is used specifically, the ventilation is difficult due to the fact that the hydrophobic layer is coated, and the breathing comfort of the mask is reduced. The invention creatively soaks the S-layer non-woven fabric of the spunlace fiber-opening and net-fixing into the low-concentration polytetrafluoroethylene emulsion and then continuously blows the non-woven fabric by using strong air flow, thereby effectively solving the problems.
The invention firstly prepares the polypropylene slices into fibers by melt spinning, and the polypropylene fibers have the excellent characteristics of small density, high strength, small hygroscopicity, acid resistance, alkali resistance, wear resistance, good electrical property and the like, and are excellent raw materials of melt-blown non-woven fabrics. The melt-blown cloth obtained by further spinning has larger specific surface area and smaller aperture, and can be used for manufacturing a filter material with very high quality, so that the melt-blown cloth can be used as a raw material of a protective mask.
Further, polypropylene fiber component yarns are laid into a net, then spunlace fiber opening and fixing are carried out, the spunlace fiber opening and fixing mainly comprises the steps of impacting the fiber net by utilizing jet high-pressure water, enabling fibers to be opened and separated by means of hydraulic bonding interface performance difference, mutually entangling the fibers, and reinforcing the fiber net to obtain fiber spunlace non-woven fabrics; the fiber-opening and net-fixing by the spunlace can improve the barrier property to fine matters, bacteria and the like, and simultaneously has better moisture absorption and air permeability and reduces the filtration resistance. Soaking the pre-bonded non-woven fabric obtained by water-jet fiber opening and net fixing into low-concentration polytetrafluoroethylene emulsion, and fully soaking the fibers of the pre-bonded non-woven fabric by the emulsion to fully wrap the fibers and endow the non-woven fabric with hydrophobicity by adopting the low-concentration polytetrafluoroethylene emulsion; on the other hand, the polytetrafluoroethylene emulsion with lower concentration is easy to blow away under the action of strong airflow, thus preventing micropores of the pre-bonded non-woven fabric from being blocked by the polytetrafluoroethylene emulsion, and endowing the non-woven fabric with good air permeability. The pre-bonded non-woven fabric dipped with the low-concentration polytetrafluoroethylene emulsion is rolled and then passes through a hot strong airflow blowing drying chamber, and strong airflow is blown from one surface of the pre-bonded non-woven fabric to the other surface, so that the micro-pores of the pre-bonded non-woven fabric are kept to be communicated and have good air permeability, and meanwhile, the polytetrafluoroethylene emulsion is solidified on the surfaces of the through-pores and fibers, so that the non-woven fabric can be endowed with good waterproof performance, and the pre-treated spun-bonded non-woven fabric S with good air permeability and waterproof performance is obtained.
Furthermore, the melt-blown fabric electret treatment is used as a melt-blown M layer, after the melt-blown fabric electret treatment, the surface of a melt-blown fabric material is wider, the capture capacity of particles is enhanced, the adsorption and polarization effects of particles are stronger, and the respiratory resistance is not changed while the filtration efficiency is greatly improved. And then overlapping the melt-blown M layer subjected to electret treatment and the pretreated spunbonded non-woven fabric S into an S-M-S structure, and performing hot rolling forming to obtain the spunbonded-melt-blown-spunbonded (SMS) composite non-woven fabric with better waterproof and air permeability, which can be widely used for protective masks.
The existing spun-bonded-melt-blown-spun-bonded (SMS) composite non-woven fabric is used for the mask, and the application is limited due to the problem that the hydrophobic coating is coated to influence the air permeability. In view of the above, the invention provides a method for processing a waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for a mask, which comprises the steps of extruding and melting polypropylene slices by a screw to form a melt, filtering by a filter, spraying spinning by a spinneret plate under the action of pressure, cooling by cold air and carrying out air flow drafting to obtain fibers; the obtained fibers are split, laid into a net, spunlaced, opened and fixed to obtain pre-bonded non-woven fabric, the pre-bonded non-woven fabric is further conveyed by a roller and soaked with low-concentration polytetrafluoroethylene emulsion, rolled and continuously and uniformly blown and dried by a hot strong airflow blowing and drying chamber, so that the emulsion is uniformly attached to the fibers of the pre-bonded non-woven fabric, good air permeability is kept, and the pre-bonded non-woven fabric S is obtained by coiling; and performing electret treatment on the melt-blown fabric to form a melt-blown M layer, overlapping the melt-blown M layer with pretreated spunbonded non-woven fabric S to form an S-M-S structure, performing hot rolling forming, and winding by using a winding machine to obtain the waterproof breathable spunbond-melt-blown-spunbond non-woven fabric for the mask. According to the method provided by the invention, the spunlace fiber-opening and net-fixing method is utilized to obtain the spunbonded non-woven fabric S with better air permeability, the low-concentration polytetrafluoroethylene emulsion is used for soaking and strong air flow is used for blowing, the hydrophobicity and the air permeability of the non-woven fabric are improved, and the non-woven fabric is further compounded with the melt-blown fabric subjected to electret treatment to obtain the composite non-woven fabric with better waterproof and air permeability, so that the non-woven fabric can be widely used for protective masks.
The invention provides a method for processing waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for a mask, which has the outstanding characteristics and excellent effects compared with the prior art:
1. the invention carries out spunlace fiber opening and web fixing on the polypropylene fiber to obtain the spunbonded nonwoven fabric S, so that the S-layer nonwoven fabric has good fine fiber network, thereby having better air permeability.
2. According to the invention, the low-concentration polytetrafluoroethylene emulsion is used for soaking the non-woven fabric, and the strong airflow is continuously used for blowing and drying the non-woven fabric, so that on one hand, the emulsion is beneficial to fully soaking the fibers of the non-woven fabric, the fibers are fully wrapped, and the non-woven fabric is endowed with hydrophobicity; on the other hand, the polytetrafluoroethylene emulsion with lower concentration is easy to blow away under the action of strong airflow, thus preventing the micropores of the non-woven fabric from being blocked by the film formation of the polytetrafluoroethylene emulsion and endowing the non-woven fabric with good air permeability.
3. The composite non-woven fabric prepared by the invention keeps good micro-pores, and the fiber interface and the micro-pore interface are covered with polytetrafluoroethylene, so that the composite non-woven fabric has better waterproof and air permeability.
Drawings
FIG. 1: the processing method of the invention is used for pretreating the spunbonded nonwoven fabric S; wherein, 1-screw extrusion melting; 2-filtering by a filter; 3-spinning by a spinning plate and drafting by airflow; 4-dividing and laying the filaments into nets; 5-soaking in low-concentration polytetrafluoroethylene emulsion; 6-rolling; 7-blowing and drying; and 8-coiling.
FIG. 2: example 1 a 500-fold micrograph of the resulting pretreated spunbond nonwoven was taken. The micropores were not significantly blocked.
FIG. 3: comparative example 1 a 500-fold micrograph of the resulting pretreated spunbond nonwoven was taken. The micropores accumulate a large amount of polytetrafluoroethylene.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Extruding and melting an S1004 spinning PP slice by a screw to form a melt, filtering by a filter, spraying spinning by a spinning plate under the action of pressure, cooling by cold air, and drafting by air flow at the speed of 900m/min to obtain fibers;
(2) dividing and laying the fibers into webs, then carrying out spunlace fiber opening and web fixation to obtain pre-bonded non-woven fabric, wherein the water jet pressure of the spunlace fiber opening and web fixation is 35kg/cm2The aperture is 0.25mm, the water temperature is 35 ℃, the frequency of a spunlace pump is 40Hz, the linear density of the opened fiber is 0.07dtex, then the fiber is conveyed by a roller and soaked with polytetrafluoroethylene emulsion with the mass concentration of 2.5 percent and rolled, and then the fiber passes through a hot strong airflow blowing and drying chamber, the temperature of hot airflow is 85 ℃, the pressure of the airflow is 0.07MPa, the pre-bonded non-woven fabric soaked with the polytetrafluoroethylene emulsion is continuously and uniformly blown and dried, so that the emulsion is uniformly attached to the fiber of the pre-bonded non-woven fabric, good air permeability is kept, and then the fiber is coiled to obtain the fiber with the quantitative of 16.5 g/m2The pretreated spunbonded nonwoven fabric S;
(3) the quantitative determination is 11 g/m2The melt-blown fabric is subjected to electret treatment to form a melt-blown M layer, the voltage of the electret treatment is 48kV, the time is 32S, the melt-blown M layer and the pre-treated spun-bonded non-woven fabric are overlapped to form an S-M-S structure, hot rolling forming is carried out, flat hot rolling is adopted for hot rolling forming, the temperature is 135 ℃, the pressure is 3.5MPa, the time is 14S, and then a winding machine is used for winding, so that the waterproof breathable spunbond-melt-blown-spunbond non-woven fabric for the mask is obtained.
Example 2
(1) Extruding and melting an S1004 spinning PP slice by a screw to form a melt, filtering by a filter, spraying spinning by a spinning plate under the action of pressure, cooling by cold air, and drafting by air flow at a speed of 850m/min to obtain fibers;
(2) dividing and laying the fibers into webs, then carrying out spunlace fiber opening and web fixation to obtain pre-bonded non-woven fabric, wherein the water jet pressure of the spunlace fiber opening and web fixation is 32kg/cm2The aperture is 0.2mm, the water temperature is 30 ℃, the frequency of a spunlace pump is 35Hz, the linear density of the opened fiber is 0.065dtex, then the fiber is conveyed by a roller and is soaked with polytetrafluoroethylene emulsion with the mass concentration of 2.2 percent and is rolled, the fiber passes through a hot strong airflow blowing and drying chamber, the temperature of hot airflow is 83 ℃, the pressure of the airflow is 0.065MPa, the pre-bonded non-woven fabric soaked with the polytetrafluoroethylene emulsion is continuously and uniformly blown and dried, the emulsion is uniformly attached to the fiber of the pre-bonded non-woven fabric, good air permeability is kept, and then the fiber is coiled to obtain the fiber with the quantitative of 16 g/m2The pretreated spunbonded nonwoven fabric S;
(3) the quantitative determination is 10.5 g/m2The melt-blown fabric is subjected to electret treatment to form a melt-blown M layer, the voltage of the electret treatment is 45kV, the time is 35S, the melt-blown M layer and the pre-treated spun-bonded non-woven fabric are overlapped to form an S-M-S structure, hot rolling forming is carried out, flat hot rolling is adopted for hot rolling forming, the temperature is 132 ℃, the pressure is 3.2MPa, the time is 16S, and then a winding machine is used for winding, so that the waterproof breathable spunbond-melt-blown-spunbond non-woven fabric for the mask is obtained.
Example 3
(1) Extruding and melting an S1004 spinning PP slice by a screw to form a melt, filtering by a filter, spraying spinning by a spinning plate under the action of pressure, cooling by cold air, and drafting by air flow at a speed of 950m/min to obtain fibers;
(2) dividing and laying the fibers into webs, then carrying out spunlace fiber opening and web fixation to obtain pre-bonded non-woven fabric, wherein the water jet pressure of the spunlace fiber opening and web fixation is 38kg/cm2Pore diameter of 0.28mm, water temperature of 45 ℃ and spunlace pump frequency of45Hz, the linear density of the opened fiber is 0.08dtex, then the fiber is conveyed by a roller and is soaked with polytetrafluoroethylene emulsion with the mass concentration of 2.8 percent and is rolled, then the fiber is continuously and uniformly blown and dried on the pre-bonded non-woven fabric soaked with the polytetrafluoroethylene emulsion by a hot strong airflow blowing and drying chamber, the temperature of the hot airflow is 88 ℃, the pressure of the airflow is 0.08MPa, the fiber of the pre-bonded non-woven fabric is uniformly adhered with the emulsion, the good air permeability is kept, and then the fiber is coiled to obtain the fiber with the quantitative of 17 g/m2The pretreated spunbonded nonwoven fabric S;
(3) the quantitative determination was 11.5 g/m2The melt-blown fabric is subjected to electret treatment to form a melt-blown M layer, the voltage of the electret treatment is 50kV, the time is 30S, the melt-blown M layer and the pre-treated spun-bonded non-woven fabric are overlapped to form an S-M-S structure, hot rolling forming is carried out, flat hot rolling is adopted for hot rolling forming, the temperature is 138 ℃, the pressure is 3.8MPa, the time is 12S, and then a winding machine is used for winding, so that the waterproof breathable spunbond-melt-blown-spunbond non-woven fabric for the mask is obtained.
Example 4
(1) Extruding and melting an S1004 spinning PP slice by a screw to form a melt, filtering by a filter, spraying spinning by a spinning plate under the action of pressure, cooling by cold air, and drafting by air flow at a speed of 800m/min to obtain fibers;
(2) dividing and laying the fibers into webs, then carrying out spunlace fiber opening and web fixation to obtain pre-bonded non-woven fabric, wherein the water jet pressure of the spunlace fiber opening and web fixation is 30kg/cm2The aperture is 0.2mm, the water temperature is 20 ℃, the frequency of a spunlace pump is 30Hz, the linear density of the opened fiber is 0.06dtex, then the fiber is conveyed by a roller and dipped with 2 percent of polytetrafluoroethylene emulsion by mass concentration and rolled, and then the fiber passes through a hot strong airflow blowing and drying chamber, the temperature of hot airflow is 80 ℃, the pressure of the air airflow is 0.06MPa, the pre-bonded non-woven fabric dipped with the polytetrafluoroethylene emulsion is continuously and uniformly blown and dried, so that the emulsion is uniformly attached to the fiber of the pre-bonded non-woven fabric, good air permeability is kept, and then the fiber is coiled to obtain the fiber with the quantitative of 15 g/m2The pretreated spunbonded nonwoven fabric S;
(3) the quantitative determination is 10 g/m2The melt-blown fabric is subjected to electret treatment as meltSpraying an M layer, performing electret treatment at the voltage of 40kV for 40S, laminating the M layer and the pretreated spunbonded non-woven fabric into an S-M-S structure, performing hot rolling forming, performing flat hot rolling at the temperature of 130 ℃, under the pressure of 3MPa for 18S, and winding by using a winding machine to obtain the waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask.
Example 5
(1) Extruding and melting an S1004 spinning PP slice by a screw to form a melt, filtering by a filter, spraying spinning by a spinning plate under the action of pressure, cooling by cold air, and drafting by air flow at the speed of 1000m/min to obtain fibers;
(2) dividing and laying the fibers into webs, then carrying out spunlace fiber opening and web fixation to obtain pre-bonded non-woven fabric, wherein the water jet pressure of the spunlace fiber opening and web fixation is 40kg/cm2The aperture is 0.3mm, the water temperature is 50 ℃, the frequency of a spunlace pump is 50Hz, the linear density of the opened fiber is 0.08dtex, then the fiber is conveyed by a roller and is soaked with polytetrafluoroethylene emulsion with the mass concentration of 3 percent and is rolled, the fiber passes through a hot strong airflow blowing and drying chamber, the temperature of hot airflow is 90 ℃, the pressure of the air airflow is 0.08MPa, the pre-bonded non-woven fabric soaked with the polytetrafluoroethylene emulsion is continuously and uniformly blown and dried, the emulsion is uniformly attached to the fiber of the pre-bonded non-woven fabric, good air permeability is kept, and then the fiber is coiled to obtain the fiber with the quantitative of 18 g/m2The pretreated spunbonded nonwoven fabric S;
(3) the quantitative determination is 10-12 g/m2The melt-blown fabric is subjected to electret treatment to form a melt-blown M layer, the voltage of the electret treatment is 55kV, the time is 25S, the melt-blown fabric and the pretreated spunbond non-woven fabric are overlapped to form an S-M-S structure, hot rolling forming is carried out, flat hot rolling is adopted for hot rolling forming, the temperature is 140 ℃, the pressure is 4MPa, the time is 10S, and then winding is carried out by a winding machine, so that the waterproof breathable spunbond-melt-blown-spunbond non-woven fabric for the mask is obtained.
Comparative example 1
Comparative example 1 in comparison with example 1, in the pretreatment of the spunbond nonwoven fabric S, through-air drying was not carried out with a strong air stream, but directly with a hot air stream, and the other was completely identical to example 1.
The test method comprises the following steps:
and (3) testing air permeability: the nonwoven fabrics obtained in the examples and comparative examples of the present invention were subjected to air permeability test with reference to spunbonded/meltblown/spunbonded (SMS) nonwoven fabric (FZ/T64034-2014) and determination of air permeability of textile fabrics (GB/T5453-1997) by selecting 20cm2The test pressure difference of the test head is 100Pa, the air permeability is obtained by testing, and the test result is shown in Table 1;
and (3) testing the waterproofness: the nonwoven fabrics obtained in the examples and comparative examples of the present invention were subjected to a test for water repellency by referring to "nonwoven fabric by spunbond/meltblown/spunbond (SMS) method" (FZ/T64034-. The waterproof performance of the spun-bonded-melt-blown-spun-bonded non-woven fabric is measured by hydrostatic pressure, the higher the hydrostatic pressure is, the better the water-seepage-resistant performance of the non-woven fabric is, and the better the waterproof performance is, so that the condition that the melt-blown fabric layer is soaked by water vapor to influence the electret electrostatic adsorption performance can be effectively prevented. The test results are shown in table 1.
Table 1:
as can be seen from Table 1, through the performance test, the invention makes the non-woven fabric fully soaked with polytetrafluoroethylene and has hydrophobicity by the water jet fiber-opening and net-fixing and the strong air flow blowing drying of the non-woven fabric; meanwhile, the polytetrafluoroethylene emulsion with lower concentration is easily blown off under the action of strong airflow, thus preventing the micropores of the non-woven fabric from being blocked by the film formed by the polytetrafluoroethylene emulsion and endowing the non-woven fabric with good air permeability. Therefore, the non-woven fabric prepared by the invention comprehensively shows good air permeability and excellent waterproof performance.
Claims (10)
1. A treatment method of a waterproof breathable spun-bonded-melt-blown-spun non-woven fabric for a mask is characterized in that polypropylene slices are subjected to melt spinning to obtain fibers, then the fibers are divided and laid into nets, then spunlace fiber-opening and net-fixing are carried out to obtain pre-bonded non-woven fabric, then low-concentration polytetrafluoroethylene emulsion is soaked, then rolling and blowing are carried out to obtain pre-treated spun-bonded non-woven fabric S, then the melt-blown fabric subjected to electret treatment is used as a melt-blown M layer and is superposed into an S-M-S structure, and finally rolling and winding are carried out to obtain the waterproof breathable spun-bonded-melt-blown-spun non-woven fabric for the mask; the specific treatment method comprises the following steps:
(1) extruding and melting a polypropylene slice by a screw to form a melt, filtering the melt by a filter, spraying the melt through a spinning plate under the action of pressure for spinning, cooling by cold air, and drafting by air flow to obtain fibers;
(2) dividing and overlaying fibers into a net, then carrying out spunlace fiber opening and net fixing to obtain pre-bonded non-woven fabric, conveying the pre-bonded non-woven fabric soaked with low-concentration polytetrafluoroethylene emulsion through a roller, rolling, then carrying out continuous and uniform blowing and drying treatment on the pre-bonded non-woven fabric soaked with the polytetrafluoroethylene emulsion through a hot strong airflow blowing and drying chamber to ensure that the emulsion is uniformly attached to the fibers of the pre-bonded non-woven fabric and good air permeability is kept, and then coiling to obtain pre-treated spun-bonded non-woven fabric S;
(3) performing electret treatment on the melt-blown fabric to form a melt-blown M layer, then laminating the melt-blown M layer with pretreated spun-bonded non-woven fabric S to form an S-M-S structure, performing hot rolling forming, and then winding by using a winding machine to obtain the waterproof breathable spunbond-melt-blown-spunbond non-woven fabric for the mask.
2. The method for processing the waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask as claimed in claim 1, wherein the polypropylene chips in the step (1) are S1004 spinning PP.
3. The method for processing the waterproof and breathable spunbonded-meltblown-spunbonded nonwoven fabric for masks according to claim 1, wherein the drawing speed in step (1) is controlled to be 800-1000 m/min.
4. The method for processing the water-proof and air-permeable spunbonded-meltblown-spunbonded non-woven fabric for the mask as claimed in claim 1, wherein the step (2) of water-jet spinningThe water jet pressure of the fixed net is 30-40kg/cm2The aperture is 0.2-0.3mm, the water temperature is 20-50 ℃, the frequency of a spunlace pump is 30-50Hz, and the linear density of the opened fiber is 0.06-0.08 dtex.
5. The method for processing the waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask as claimed in claim 1, wherein the mass concentration of the low-concentration polytetrafluoroethylene emulsion in the step (2) is 2-3%.
6. The method for processing the waterproof and breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask as claimed in claim 1, wherein the temperature of hot air flow in the strong air flow drying chamber in the step (2) is 80-90 ℃, and the pressure of the hot air flow is 0.06-0.08 MPa.
7. The method for treating a waterproof and breathable spunbonded-meltblown-spunbonded nonwoven fabric for a mask as claimed in claim 1, wherein the pre-treated spunbonded nonwoven fabric S in the step (2) has a basis weight of 15-18 g/m2。
8. The method for treating a waterproof and breathable spunbonded-meltblown-spunbonded non-woven fabric for a mask according to claim 1, wherein the melt-blown fabric has a basis weight of 10-12 g/m in the step (3)2。
9. The method for processing the waterproof breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask as claimed in claim 1, wherein the voltage of the electret processing in the step (3) is 40-55kV for 25-40 s.
10. The method for processing the waterproof and breathable spunbonded-meltblown-spunbonded non-woven fabric for the mask as claimed in claim 1, wherein the hot rolling molding in the step (3) is flat hot rolling at a temperature of 130-140 ℃, a pressure of 3-4MPa and a time of 10-18 s.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112746504A (en) * | 2020-12-29 | 2021-05-04 | 上海邀加科技有限公司 | Waterproof breathable water-soluble protective material |
| CN112773019A (en) * | 2021-01-29 | 2021-05-11 | 腾飞科技股份有限公司 | Protective mask capable of being washed repeatedly and preparation process thereof |
| CN114603933A (en) * | 2020-12-09 | 2022-06-10 | 财团法人纺织产业综合研究所 | Laminating device and laminating method for preparing breathable waterproof fabric |
-
2020
- 2020-05-15 CN CN202010414214.9A patent/CN111593482A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114603933A (en) * | 2020-12-09 | 2022-06-10 | 财团法人纺织产业综合研究所 | Laminating device and laminating method for preparing breathable waterproof fabric |
| CN112746504A (en) * | 2020-12-29 | 2021-05-04 | 上海邀加科技有限公司 | Waterproof breathable water-soluble protective material |
| CN112773019A (en) * | 2021-01-29 | 2021-05-11 | 腾飞科技股份有限公司 | Protective mask capable of being washed repeatedly and preparation process thereof |
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