LU500385B1 - Method for preparing biodegradable filter materials - Google Patents

Method for preparing biodegradable filter materials Download PDF

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Publication number
LU500385B1
LU500385B1 LU500385A LU500385A LU500385B1 LU 500385 B1 LU500385 B1 LU 500385B1 LU 500385 A LU500385 A LU 500385A LU 500385 A LU500385 A LU 500385A LU 500385 B1 LU500385 B1 LU 500385B1
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LU
Luxembourg
Prior art keywords
pulp
polylactic acid
nonwoven fabric
filter substrate
filter
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Application number
LU500385A
Other languages
German (de)
Inventor
Wenjia Han
Yang Zhang
Tingting Cao
Xia Li
Qijun Ding
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Qilu Univ Of Technology Shandong Academy Ofsciences
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Priority to LU500385A priority Critical patent/LU500385B1/en
Application granted granted Critical
Publication of LU500385B1 publication Critical patent/LU500385B1/en

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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
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/26—Wood pulp
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1615—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of natural origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2055—Carbonaceous material
    • B01D39/2065—Carbonaceous material the material being fibrous
    • 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
    • D04H1/4209—Inorganic fibres
    • D04H1/4242—Carbon fibres
    • 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
    • D04H1/42—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
    • D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
    • D04H1/43835—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • 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
    • D04H1/498—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 entanglement of layered webs
    • 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
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0266—Types of fibres, filaments or particles, self-supporting or supported materials comprising biodegradable or bio-soluble polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0435—Electret
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0636—Two or more types of fibres present in the filter material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0663—The layers being joined by hydro-entangling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1291—Other parameters

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The present disclosure provides a method for preparing biodegradable filter materials, comprising: (1) adding a retention agent into fibrous raw materials (plant fibers, carbon fibers and collagen fibers) to prepare a wet paper web with a basis weight of 10-30 g/m2; (2) spunlacing the wet paper web obtained in the step (1) onto polylactic acid-based nonwoven fabric to obtain a fiber-polylactic acid-based nonwoven fabric filter substrate; (3) performing skin-friendly treatment on the filter substrate obtained in the step (2), so that the filter substrate has good wearing comfort; and (4) performing high-energy electron beam treatment on the filter substrate obtained after skin-friendly treatment, so that the surface of the filter substrate has relatively high electrostatic potential, thereby obtaining a completely biodegradable filter material with high filtration efficiency. The obtained filter material has excellent wearing comfort, good mechanical usability and good charge stability, and can avoid the generation of massive medical wastes caused by the use of massive disposable masks while meeting the performance requirements of filter materials.

Description

METHOD FOR PREPARING BIODEGRADABLE FILTER HUS00385
MATERIALS TECHNICAL FIELD
[0001] The present disclosure belongs to the technical field of novel materials, and particularly relates to a method for preparing biodegradable filter materials.
BACKGROUND OF THE PRESENT INVENTION
[0002] Natural fiber is a completely biodegradable material, and is also a porous material with relatively high specific surface area and relatively strong adsorbability, soit has great development potential to prepare biodegradable air filter materials with such fibers as raw materials.
[0003] The present disclosure discloses a method for preparing biodegradable filter materials to improve the electrostatic effect and filtration efficiency.
SUMMARY OF PRESENT INVENTION
[0004] According to the present disclosure, a fiber-based wet paper web is spunlaced onto polylactic acid-based nonwoven fabric to obtain a completely biodegradable filter substrate; and then the filter substrate is endowed with good wearing comfort and relatively high filtration efficiency through skin-friendly treatment and high-energy electron beam treatment, thereby overcoming the defects of poor electrostatic effect and low filtration efficiency in a process of combining natural fibers with polylactic acid materials.
[0005] To achieve the above purpose, the present disclosure adopts a technical solution as follows.
[0006] The present disclosure also provides a method for preparing biodegradable filter materials, including the following steps:
[0007] (1) adding a retention agent into pulp to prepare a wet paper web with a basis weight of 10-30 g/m?, wherein plant fibers, carbon fibers and collagen fibers are all added;
[0008] (2) spunlacing the wet paper web obtained in the step (1) onto polylactic acid-based nonwoven fabric to obtain a fiber-polylactic acid-based nonwoven fabric filter substrate;
[0009] (3) performing skin-friendly treatment on the filter substrate obtained in the 1 step (2), so that the filter substrate has good wearing comfort; and LU500385
[0010] (4) drying the filter substrate obtained after skin-friendly treatment, and then performing high-energy electron beam treatment, so that the surface of the filter substrate has relatively high electrostatic potential, thereby obtaining a completely biodegradable filter material with high filtration efficiency.
[0011] Preferably, the pulp in the step (1) includes softwood pulp, hardwood pulp, wheat straw pulp, cotton pulp, cotton linter pulp, bamboo pulp, as well as pulp cellulose, carbon fiber and collagen fiber prepared by physical and chemical methods with natural fibers as raw materials. Further, the pulp preferably includes the cotton inter pulp, the carbon fiber and the collagen fiber.
[0012] Preferably, in the step (1), the pulp is prepared into a wet paper web through a wet beating and sizing system by using an inclined wire machine. Further, the sizing concentration in the sizing system is 0.5%-1.5%, preferably 1%.
[0013] Preferably, the retention agent in the step (1) is cationic polyacrylamide; and the dosage is 2% of the absolute dry mass of pulp. The basis weight of the paper web is preferably 20 g/m”.
[0014] Preferably, the spunlaced polylactic acid-based nonwoven fabric in the step (2) is a commercial product or is obtained by pretreating the commercial polylactic acid-based nonwoven fabric. The process for pretreating the commercial polylactic acid-based nonwoven fabric in the step (2) includes the following conditions:
[0015] the basis weight of commercial polylactic acid-based nonwoven fabric is 8-15 g/m? preferably 13 g/m°;
[0016] the number of pre-spunlacing times is 1-4 times, preferably once;
[0017] the pre-spunlacing water pressure is 20-80 bar, preferably 50 bar; and
[0018] a distance between a water needle plate and a fiber web is 0-30 mm, preferably 5 mm.
[0019] The polylactic acid-based nonwoven fabric can be pre-spunlaced to compact the fluffy nonwoven fabric, thereby removing air from the substrate, enhancing the absorption of water needle energy by the substrate in the subsequent spunlace process, and strengthening the entanglement of fibers in the spunlace process.
[0020] Preferably, in the step (2), the wet paper web is spunlaced onto the spunlaced polylactic acid-based nonwoven fabric under the following conditions:
[0021] the spunlacing water pressure is 10-50 bar, preferably 30 bar; and
[0022] the distance between the water needle plate and the fiber web is 0-30 mm, 2 preferably 20 mm. LU500385
[0023] Preferably, the skin-friendly treatment in the step (3) is performed by dipping or spraying a hand feeling agent; and the hand feeling agent used is a linear polydimethylsiloxane solution. The dosage of the hand feeling agent is 2-5% of the absolute dry mass of the pulp, preferably 3%.
[0024] Preferably, the high-energy electron beam treatment in the step (4) is performed under the following conditions: the high-energy electron beam treatment distance is 1-10 cm, preferably 4 cm; and the dosage is 20-80 kGy, preferably 30 kGy.
[0025] The method provided by the present disclosure is adopted to prepare the completely biodegradable filter material by spunlacing the fiber-based wet paper web onto the polylactic acid-based nonwoven fabric and combining skin-friendly treatment with high-energy electron beam treatment, and solves the environmental problems caused by non-biodegradable filter materials for preparing masks, and the problems of low filtration efficiency and strength of degradable fibers as filter materials.
[0026] Compared with the prior art, the present disclosure has the following advantages and beneficial effects:
[0027] The completely biodegradable filter material is prepared by taking degradable fibers and polylactic acid fiber-based nonwoven fabrics as base materials according to the present disclosure, and has excellent wearing comfort, good mechanical usability and good charge stability, thereby avoiding the generation of massive medical wastes, the great harm to the environment and the possible secondary pollution caused by the use of massive disposable masks, establishing the concept of green production, environmental protection and carbon reduction, and promoting the sustainable development of mask industry.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0028] The present disclosure will be further described in detail below in combination with embodiments, but the embodiments of the present disclosure are not limited thereto. Unless otherwise specified, the raw materials used in the embodiments of the present disclosure are all ordinary commercial products; and the processing methods used are conventional means in the field of papermaking, unless otherwise specified.
3
[0029] Bleached sulfate softwood pulp and alkaline hardwood pulp are purchased LU500385 from Dalian Yangrun Trading Co., Ltd.; and fluff pulp is purchased from Lingshou County Kuanyuan Mineral Products Processing Plant.
[0030] A hand feeling agent, Dow Corning 205SL, contains 50% of linear polydimethylsiloxane as an effective component, and ethylene glycol as a solvent.
[0031] Test for filtering performance:
[0032] The filtration efficiency and the airflow resistance of materials to particles are tested with reference to the method in GB19083-2003 Technical Requirements for Medical Protective Masks. The American TSI3160 classification efficiency test bench is used as the test device; the test medium is NaCl aerosol with a counting particle size of 0.075 um; and the flow rate of test gas is 32 L/min.
[0033] FRASER7080 electrostatic generator is used in high-energy electron beam processing equipment; and
[0034] EFMO022 electrostatic field tester is used for the speed measurement of high-energy electron beam processing performance. Embodiment 1
[0035] A method for preparing biodegradable filter materials includes the following steps:
[0036] (1) selecting bleached sulfate softwood pulp, carbon fiber and collagen fiber according to a ratio of 7: 1: 2, beating by PFI to have a pulp consistency of 1%, adding cationic polyacrylamide having a molecular weight of 8 million and accounting for 2% of the absolute dry mass of pulp to serve as a retention agent, and molding with an inclined wire machine, wherein the basis weight of paper is 20 g/m?;
[0037] (2) selecting polylactic acid-based nonwoven fabric with a basis weight of 13 g/m? spunlacing once under a water pressure of 50 bar and a distance of 5 mm, and then spunlacing a wet paper web onto the polylactic acid-based spunlaced nonwoven fabric under a water pressure of 30 bar and a distance of 20 mm, to obtain a degradable fiber spunlaced polylactic acid-based nonwoven fabric filter material,
[0038] (3) performing skin-friendly treatment by soaking with a hand feeling agent, which contains linear polydimethylsiloxane as the main component and has a dosage of 3% of the absolute dry mass of pulp; and
[0039] (4) drying a filter substrate obtained by skin-friendly treatment, then performing high-energy electron beam treatment at a distance of 4 cm and a dosage of 30 kGy, and finally obtaining a completely biodegradable filter material with high 4 filtration efficiency. The composite filter material obtained in the present LU500385 embodiment has a basis weight of 36.5+0.5 g/m”, a filtration efficiency of 95%, a filtration resistance of 80 Pa, a tensile strength of 0.24 kN/m, a longitudinal tensile strength of 2.3 kN/m and a volumetric weight of 0.43 g/cm’. Embodiment 2
[0040] A method for preparing biodegradable filter materials includes the following steps:
[0041] (1) selecting sulfate softwood pulp, carbon fiber and collagen fiber according to a ratio of 7: 1: 2, beating by PFI to have a pulp consistency of 0.5%, adding tourmaline powder accounting for 20% of the absolute dry mass of pulp, adding cationic polyacrylamide having a molecular weight of 8 million and accounting for 2% of the absolute dry mass of pulp to serve as a retention agent, and molding with an inclined wire machine, in which the basis weight of paper is 20 g/m’;
[0042] (2) selecting polylactic acid-based nonwoven fabric with a basis weight of 13 g/m? spunlacing once under a water pressure of 50 bar and a distance of 5 mm, and then spunlacing a wet paper web onto the polylactic acid-based spunlaced nonwoven fabric under a water pressure of 50 bar and a distance of 20 mm, to obtain a degradable fiber spunlaced polylactic acid-based nonwoven fabric filter material,
[0043] (3) performing skin-friendly treatment by soaking with a hand feeling agent, which contains linear polydimethylsiloxane as the main component and has a dosage of 2% of the absolute dry mass of pulp; and
[0044] (4) drying the obtained material, then performing high-energy electron beam treatment at a distance of 4 cm and a dosage of 40 kGy, and finally obtaining a completely biodegradable filter material with high filtration efficiency. The composite filter material obtained in the present embodiment has a basis weight of
36.5+0.5 g/m”, a filtration efficiency of 97%, a filtration resistance of 120 Pa, a tensile strength of 0.3 kN/m, a longitudinal tensile strength of 2.6 kN/m and a volumetric weight of 0.43 g/cm’.
Comparative embodiment 1
[0045] A method for preparing biodegradable filter materials includes the following steps:
[0046] (1) selecting sulfate softwood pulp, beating by PFI, compounding with polylactic acid fiber according to a mass ratio of 20: 13, fully dispersing to prepare a 5 fiber suspension with a concentration of 1%, adding tourmaline powder accounting LU500385 for 20% of the absolute dry mass of pulp, adding cationic polyacrylamide having a molecular weight of 8 million and accounting for 2% of the absolute dry mass of pulp to serve as a retention agent, and molding with an inclined wire machine to obtain a paper base filter material;
[0047] (2) performing skin-friendly treatment by soaking with a hand feeling agent, which contains linear polydimethylsiloxane as the main component and has a dosage of 2% of the absolute dry mass of pulp; and
[0048] (3) drying the obtained material, then performing high-energy electron beam treatment at a dosage of 20 kGy.
[0049] The obtained composite filter material has a basis weight of 36.5+0.5 g/m”, a filtration efficiency of 60%, a filtration resistance of 300 Pa, a tensile strength of
0.16 kN/m, a longitudinal tensile strength of 1.0 kN/m and a volumetric weight of
0.55 g/cm’. Comparative embodiment 2
[0050] A method for preparing biodegradable filter materials includes the following steps:
[0051] (1) selecting sulfate softwood pulp, beating by PFI to have a pulp consistency of 1%, adding tourmaline powder accounting for 20% of the absolute dry mass of pulp, adding cationic polyacrylamide having a molecular weight of 8 million and accounting for 2% of the absolute dry mass of pulp to serve as a retention agent, and molding with an inclined wire machine, in which the basis weight of paper is 20 g/m’;
[0052] (2) selecting polylactic acid-based nonwoven fabric with a basis weight of 13 g/m? directly laminating with a degradable fiber paper base, performing skin-friendly treatment by soaking with a hand feeling agent, which contains linear polydimethylsiloxane as the main component and has a dosage of 2% of the absolute dry mass of pulp;
[0053] (3) drying the obtained material, then drying the laminated polylactic acid-based nonwoven fabric and degradable fiber paper base obtained in the step (2), and performing high-energy electron beam treatment at a dosage of 30 KGy; and
[0054] (4) making the obtained material have a basis weight of 37+0.5 g/m°, a filtration efficiency of 40% and a filtration resistance of 600 P. The two layers of materials are not tightly combined and are easy to delaminate. Due to the unstable 6 structure of filter materials, it is difficult to test the tensile strength and the LUS00385 volumetric weight of the filter materials. 7

Claims (8)

CLAIMS LU500385
1. A method for preparing biodegradable filter materials, comprising the following steps: (1) adding a retention agent into pulp to prepare a wet paper web with a basis weight of 10-30 g/m°, wherein the pulp comprises biodegradable filters, such as one or more of plant fibers, carbon fibers and collagen fibers in all mixing ratios; (2) spunlacing the wet paper web obtained in the step (1) onto polylactic acid-based nonwoven fabric to obtain a fiber-polylactic acid-based nonwoven fabric filter substrate; (3) performing skin-friendly treatment on the filter substrate obtained in the step (2), so that the filter substrate has good wearing comfort; and (4) drying the filter substrate obtained after skin-friendly treatment, and then performing high-energy electron beam treatment, so that the surface of the filter substrate has relatively high electrostatic potential, thereby obtaining a completely biodegradable filter material with high filtration efficiency.
2. The method according to claim 1, wherein the pulp in the step (1) mainly comprises softwood pulp, hardwood pulp, wheat straw pulp, cotton pulp, cotton linter pulp, bamboo pulp and pulp cellulose prepared by physical and chemical methods with natural fibers as raw materials which are easily available in the field of pulping and papermaking, and also comprises carbon fiber and collagen fiber as well as any ratio of the three.
3. The method according to claim 1, wherein in the step (1), the pulp is prepared into a wet paper web through a wet beating and sizing system by using an inclined wire machine; and further preferably, the sizing concentration in the sizing system is 0.5%-1.5%.
4. The method according to claim 1, wherein the retention agent in the step (1) is cationic polyacrylamide; and the dosage is 2% of the absolute dry mass of pulp.
5. The method according to claim 1, wherein the spunlaced polylactic acid-based 8 nonwoven fabric in the step (2) is a commercial product or is obtained by LU500385 pretreating the commercial polylactic acid-based nonwoven fabric; the process for pretreating the commercial polylactic acid-based nonwoven fabric in the step (2) comprises the following conditions: the basis weight of commercial polylactic acid-based nonwoven fabric is 8-15 g/m?; the number of pre-spunlacing times is 1-4 times; the pre-spunlacing water pressure is 20-80 bar; and a distance between a water needle plate and a fiber web is 0-30 mm.
6. The method according to claim 1, wherein in the step (2), the wet paper web is spunlaced onto the spunlaced polylactic acid-based nonwoven fabric under the following conditions: the spunlacing water pressure is 10-50 bar; and the distance between the water needle plate and the fiber web is 0-30 mm.
7. The method according to claim 1, wherein the skin-friendly treatment in the step (3) is performed by dipping or spraying a hand feeling agent; and the hand feeling agent used is a linear polydimethylsiloxane solution; the dosage of the hand feeling agent is 2-5% of the absolute dry mass of the pulp.
8. The method according to claim 1, wherein the high-energy electron beam treatment in the step (4) is performed under the following conditions: the distance is 1-10 cm, and the dosage is 20-80 kGy.
9
LU500385A 2021-07-02 2021-07-02 Method for preparing biodegradable filter materials LU500385B1 (en)

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LU500385A LU500385B1 (en) 2021-07-02 2021-07-02 Method for preparing biodegradable filter materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU500385A LU500385B1 (en) 2021-07-02 2021-07-02 Method for preparing biodegradable filter materials

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Publication Number Publication Date
LU500385B1 true LU500385B1 (en) 2022-01-06

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