CN107761254B - Elastic non-woven fabric and preparation method and application thereof - Google Patents

Elastic non-woven fabric and preparation method and application thereof Download PDF

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CN107761254B
CN107761254B CN201711032330.9A CN201711032330A CN107761254B CN 107761254 B CN107761254 B CN 107761254B CN 201711032330 A CN201711032330 A CN 201711032330A CN 107761254 B CN107761254 B CN 107761254B
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elastic
layer
weight
raw materials
spunbond
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CN107761254A (en
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孙文强
吴亮亮
马德勋
张志毅
鲍汉鑫
王玉梅
邓林林
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Shandong Hengpeng Hygienic Products Co ltd
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Shandong Hengpeng Hygienic Products Co ltd
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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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The invention provides an elastic non-woven fabric which comprises a first spun-bonded layer, an elastic middle layer and a second spun-bonded layer which are sequentially stacked; the surface density of the elastic non-woven fabric is 35-150g/m2The transverse tensile strength is 5.9-67.1N/50mm, the longitudinal tensile strength is 19.7-174.1N/50mm, the transverse elongation at break is 255.0-600.0%, and the longitudinal elongation at break is 69.0-397.0%. The invention also provides a preparation method of the non-woven fabric, which comprises the following steps: preparing a spunbond layer fiber web; preparing an elastic layer fiber web; and hot-press bonding is carried out by taking the elastic layer fiber web as an elastic middle layer and taking the spunbond layer fiber web as a first spunbond layer and a second spunbond layer. The elastic non-woven fabric has excellent elasticity and can be used for preparing medical sanitary materials.

Description

Elastic non-woven fabric and preparation method and application thereof
Technical Field
The invention belongs to the technical field of non-woven fabrics, and particularly relates to an activated elastic non-woven fabric and a preparation method and application thereof.
Background
Non-Woven fabrics (Non Woven Fabric or Non Woven cloth), also known as Non-Woven fabrics, are made of oriented or random fibers and are a new generation of environmentally friendly materials. The non-woven fabric has the characteristics of moisture resistance, air permeability, flexibility, light weight, easy decomposition, no toxicity, no irritation and the like, so that the non-woven fabric is more and more widely used for medical and sanitary cloth. However, due to the special use of medical and hygienic materials, nonwoven fabrics often need to have a certain elasticity.
The Chinese patent application with the application number of 201610635097.2 discloses an elastic composite non-woven fabric, which comprises an outermost elastic layer, a middle PVC resin layer and an inner non-woven fabric substrate; the elastic layer is formed by interweaving polyurethane fibers, the non-woven fabric substrate is formed by compounding polypropylene fibers and chitosan fibers, and a plurality of air holes are uniformly arranged in the non-woven fabric substrate.
The Chinese invention patent application with the application number of 201710257388.7 discloses a unidirectional stretching elastic non-woven fabric, which comprises a first elastic fabric (1), a silk/yarn/thread laying layer (2) and a second elastic fabric (3) which are sequentially laminated; the silk/yarn/thread laying layer (2) comprises a plurality of silk/yarn/threads (21), the silk/yarn/threads (21) are laid in parallel and arranged at equal intervals, and each silk/yarn/thread (21) is clamped between the elastic fiber net/elastic non-woven fabric layer (1) and the elastic fiber net/elastic non-woven fabric layer (3).
Although the composite nonwoven fabric disclosed in the above patent application document can improve elasticity, since the elastic layer is disposed on the outer layer of the composite nonwoven fabric, it is easy to deform during production and use, and it is difficult to produce and wind and inconvenient to use.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an elastic non-woven fabric and a preparation method and application thereof.
In one aspect, the present invention provides an elastic nonwoven fabric comprising a first spunbond layer, an elastic intermediate layer and a second spunbond layer, which are sequentially laminated; the surface density of the elastic non-woven fabric is 35-150g/m2The transverse tensile strength is 5.9-67.1N/50mm, the longitudinal tensile strength is 19.7-174.1N/50mm, the transverse elongation at break is 255.0-600.0%, and the longitudinal elongation at break is 69.0-397.0%.
On the other hand, the invention provides a preparation method of elastic non-woven fabric, which comprises the following steps:
(1) preparation of spunbond layer web: mixing, extruding and melting, spinning and dividing and lapping spunbond layer raw materials comprising soft master batches and polypropylene slices to obtain a spunbond layer fiber web;
(2) preparation of elastic layer web: mixing, extruding and melting, spinning and dividing and lapping elastic layer raw materials comprising an elastomer, smooth master batches and polypropylene slices to obtain an elastic layer fiber web;
(3) bonding: and (3) taking the elastic layer fiber web as an elastic middle layer, taking the spunbond layer fiber web as a first spunbond layer and a second spunbond layer, and carrying out hot-pressing bonding on the three layers of fiber webs to obtain the elastic non-woven fabric.
In another aspect, the present invention provides the use of an elastic nonwoven fabric in the manufacture of a medical hygiene material.
The invention has the following beneficial effects:
the elastic nonwoven fabric of the present invention is an activated elastic nonwoven fabric, that is, the nonwoven fabric has elasticity only after being activated by stretching without pulling. The elastic non-woven fabric is non-elastic when not activated, and is convenient to produce and use. In addition, compared with the conventional product, the elastic non-woven fabric has better elastic effect, is not easy to break and is firmer.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The existing elastic non-woven fabric products generally have the defects of poor elastic effect, easy breakage after being pulled and the like, and cannot meet the requirements of the related fields (such as the field of medical sanitary materials) on the elasticity and the strength of the non-woven fabric products. In addition, in the production and use processes, due to the elastic action, the machine operation can cause the deformation of the elastic non-woven fabric product when the machine is operated, the production and winding are difficult, and the use is also extremely inconvenient. These problems have all seriously restricted the development of the nonwoven industry.
In view of the above problems, a first aspect of the present invention provides an elastic nonwoven fabric comprising a first spunbond layer, an elastic intermediate layer and a second spunbond layer laminated in this order; the surface density of the elastic non-woven fabric is 35-150g/m2A tenacity CD (transverse tensile tenacity) of 5.9 to 67.1N/50mm, a tenacity MD (longitudinal tensile tenacity) of 19.7 to 174.1N/50mm, and an elongation CD (transverse elongation at break) of 2550% -600.0%, elongation MD (elongation at break in machine direction) 69.0% -397.0%. Preferably, the first spunbond layer and the second spunbond layer respectively account for 15-20% of the weight of the elastic nonwoven fabric.
In the CD direction, i.e., the cross direction, the elastic nonwoven has a first extension force of 7.43 to 28.89N, a first retraction force of 4.1 to 16.4N, a first 50% retraction force of 0.2 to 1.0N, a first deformation ratio of 24% to 33%, a second extension force of 6.7 to 25.4N, a second retraction force of 4.1 to 16.4N, a second 50% retraction force of 0.2 to 1.0N, and a second deformation ratio of 28% to 35%.
In the MD direction, i.e., the machine direction, the elastic nonwoven has a first extension force of 15.44 to 73.73N, a first retraction force of 8.4 to 39.8N, a first 50% retraction force of 0.2 to 1.3N, a first deformation ratio of 27% to 42%, a second extension force of 14.1 to 66.3N, a second retraction force of 8.4 to 39.8N, a second 50% retraction force of 0.2 to 1.3N, and a second deformation ratio of 30% to 44%.
In a preferred embodiment, the present invention provides an activated elastic nonwoven having a weight of 35 grams. The surface density is 32.1-36.2g/m210.7-15.3N/50mm of strong CD (transverse tensile strength), 19.7-34.7N/50mm of strong MD (longitudinal tensile strength), 255.0-353.0% of elongation CD (transverse elongation at break) and 256.0-365.0% of elongation MD (longitudinal elongation at break). In the CD direction, i.e., the cross direction, the elastic nonwoven has a first extension force of 7.08 to 8.01N, a first retraction force of 3.9 to 4.4N, a first 50% retraction force of 0.2N, a first deformation ratio of 22% to 28%, a second extension force of 6.3 to 7.3N, a second retraction force of 3.9 to 4.4N, a second 50% retraction force of 0.2N, and a second deformation ratio of 26% to 31%. In the MD direction, i.e., the longitudinal direction, the first extension force of the elastic nonwoven fabric is 13.57 to 17.02N, the first retraction force is 7.3 to 9.2N, the first 50% retraction force is 0.2N, the first deformation ratio is 24% to 29%, the second extension force is 12.5 to 15.3N, the second retraction force is 7.3 to 9.2N, the second 50% retraction force is 0.2N, and the second deformation ratio is 27% to 33%.
In another preferred embodiment, the present invention providesAn activated elastic nonwoven fabric weighing 45 grams. The surface density is 41.3-59.7g/m212.2-15.0N/50mm of strong CD (transverse tensile strength), 48.1-80.6N/50mm of strong MD (longitudinal tensile strength), 435.0-600.0% of elongation CD (transverse elongation at break) and 148.0-193.0% of elongation MD (longitudinal elongation at break). In the CD direction, i.e., the cross direction, the elastic nonwoven has a first extension force of 8.01 to 11.47N, a first retraction force of 4.4 to 6.2N, a first 50% retraction force of 0.2 to 0.3N, a first deformation ratio of 28% to 32%, a second extension force of 7.3 to 10.3N, a second retraction force of 4.4 to 6.2N, a second 50% retraction force of 0.2 to 0.3N, and a second deformation ratio of 31% to 35%. In the MD direction, i.e., the longitudinal direction, the first stretching force of the elastic nonwoven fabric is 19.12 to 21.40N, the first retractive force is 10.3 to 11.3N, the first 50% retractive force is 0.4 to 0.5N, the first deformation ratio is 27 to 32%, the second stretching force is 17.4 to 19.5N, the second retractive force is 10.3 to 11.3N, the second 50% retractive force is 0.4N, and the second deformation ratio is 30 to 34%.
In another preferred embodiment, the present invention provides an activated elastic nonwoven having a weight of 70 grams. The surface density is 66.2-80.5g/m226.3-34.8N/50mm of strong CD (transverse tensile strength), 92.8-106.5N/50mm of strong MD (longitudinal tensile strength), 301.0-448.0% of elongation CD (transverse elongation at break) and 197.0-238.0% of elongation MD (longitudinal elongation at break). In the CD direction, i.e., the cross direction, the elastic nonwoven has a first extension force of 16.56 to 17.14N, a first retraction force of 9.2 to 9.4N, a first 50% retraction force of 0.5N, a first deformation ratio of 31% to 33%, a second extension force of 14.8 to 15.3N, a second retraction force of 9.2 to 9.4N, a second 50% retraction force of 0.5N, and a second deformation ratio of 33% to 35%. In the MD direction, i.e., the longitudinal direction, the elastic nonwoven has a first extension force of 25.99 to 34.01N, a first retraction force of 14.2 to 18.3N, a first 50% retraction force of 0.5 to 0.6N, a first deformation ratio of 29% to 33%, a second extension force of 23.7 to 31.0N, a second retraction force of 14.2 to 18.3N, a second 50% retraction force of 0.5 to 0.6N, and a second deformation ratio of 32% to 37%.
In another preferred embodimentIn one embodiment, the present invention provides an activated elastic nonwoven fabric weighing 90 grams. The surface density is 82.7-97.5g/m239.8-52.7N/50mm of strong CD (transverse tensile strength), 91.6-110.8N/50mm of strong MD (longitudinal tensile strength), 355.0-401.0% of elongation CD (transverse elongation at break) and 315.0-355.0% of elongation MD (longitudinal elongation at break). In the CD direction, i.e., the cross direction, the elastic nonwoven has a first extension force of 20.91 to 22.77N, a first retraction force of 11.8 to 12.8N, a first 50% retraction force of 0.5 to 0.6N, a first deformation ratio of 32% to 34%, a second extension force of 18.8 to 20.2N, a second retraction force of 11.8 to 12.8N, a second 50% retraction force of 0.5 to 0.6N, and a second deformation ratio of 33% to 37%. In the MD direction, i.e., the machine direction, the elastic nonwoven has a first extension force of 35.70-36.16N, a first retraction force of 19.5-20.5N, a first 50% retraction force of 0.5-0.9N, a first deformation ratio of 35% -46%, a second extension force of 32.5-32.6N, a second retraction force of 19.5-20.5N, a second 50% retraction force of 0.5-0.9N, and a second deformation ratio of 37% -48%.
In another preferred embodiment, the present invention provides an activated elastic nonwoven having a weight of 120 grams. The surface density is 104.8-124.5g/m251.7-57.7N/50mm of strong CD (transverse tensile strength), 111.6-141.3N/50mm of strong MD (longitudinal tensile strength), 364.0-426.0% of elongation CD (transverse elongation at break) and 314.0-397.0% of elongation MD (longitudinal elongation at break). In the CD direction, i.e., the cross direction, the elastic nonwoven has a first extension force of 24.81 to 25.97N, a first retraction force of 13.8 to 14.4N, a first 50% retraction force of 0.7 to 0.8N, a first deformation ratio of 30% to 32%, a second extension force of 22.0 to 23.0N, a second retraction force of 13.8 to 14.4N, a second 50% retraction force of 0.7 to 0.8N, and a second deformation ratio of 32% to 35%. The elastic nonwoven has a first extension force of 48.56 to 55.74N, a first retraction force of 27.0 to 30.0N, a first 50% retraction force of 0.5 to 1.0N, a first deformation ratio of 35% to 48%, a second extension force of 44.5 to 50.7N, a second retraction force of 27.0 to 30.0N, a second 50% retraction force of 0.5 to 1.0N, and a second deformation force of 44.5 to 50.7N in the MD direction, i.e., the longitudinal directionThe ratio is 38% -50%.
In another preferred embodiment, the present invention provides an activated elastic nonwoven having a weight of 150 grams. The surface density is 146.2-161.6g/m259.5-67.1N/50mm of strong CD (transverse tensile strength), 152.7-174.1N/50mm of strong MD (longitudinal tensile strength), 364.0-402.0% of elongation CD (transverse elongation at break) and 320.0-382.0% of elongation MD (longitudinal elongation at break). In the CD direction, i.e., the cross direction, the elastic nonwoven has a first extension force of 27.32 to 29.86N, a first retraction force of 15.5 to 17.0N, a first 50% retraction force of 0.8 to 1.0N, a first deformation ratio of 26% to 31%, a second extension force of 24.0 to 26.3N, a second retraction force of 15.5 to 17.0N, a second 50% retraction force of 0.8 to 1.0N, and a second deformation ratio of 29% to 33%. In the MD direction, i.e., the machine direction, the elastic nonwoven has a first extension force of 70.77.47N, a first retraction force of 38.5-42.0N, a first 50% retraction force of 1.0-1.5N, a first deformation ratio of 33% to 42%, a second extension force of 64.0-69.8N, a second retraction force of 38.5-42.0N, a second 50% retraction force of 1.0-1.5N, and a second deformation ratio of 37% to 44%.
In the present invention, the first stretching force, the second stretching force, the first retraction force, the second retraction force, the first 50% retraction force, the second 50% retraction force, the first deformation rate, and the second deformation rate are all used to characterize the elasticity of the nonwoven fabric, and the specific determination manner is shown in the examples. Wherein, the smaller the first stretching force and the second stretching force, the better the elasticity, the larger the first retraction force, the second retraction force, the first 50% retraction force and the second 50% retraction force, the better the elasticity, the smaller the first deformation rate and the second deformation rate.
The elastic nonwoven fabric of the present invention is an activated elastic nonwoven fabric, that is, the elastic nonwoven fabric has elasticity only after being activated by stretching without being pulled, and specifically, the elastic nonwoven fabric is activated by a speed difference of stretching rollers, for example, the nonwoven fabric passes through a plurality of pulling and stretching rollers, and the nonwoven fabric is activated by applying a force to the nonwoven fabric by the speed difference.
The upper layer and the lower layer of the elastic non-woven fabric are spunbonded layers (namely a first spunbonded layer and a second spunbonded layer), and the middle layer is an elastic layer. On one hand, the two sides are the spunbonded layers, so the elastic non-woven fabric is not pulled and has no elasticity, is not adhered, is convenient to cut and is easy to wind in the production and storage processes, and the problems of deformation, difficult production and winding, extremely inconvenient use and the like caused by the operation of a machine during the loading process due to the elastic action in the production and the use of pure elastic products are effectively avoided. On the other hand, the upper and lower spunbonded layers are thin spunbonded layers (respectively accounting for 15-20% of the weight of the elastic non-woven fabric), are easy to pull and activate and are not easy to break, so that the elastic non-woven fabric is higher in strength, firm and durable, and the elastic effect is better after activation due to the existence of the elastic middle layer.
In a second aspect of the invention, a method of making an elastic nonwoven is provided. In order to be able to produce the activated elastic nonwoven described above, the inventors have developed an improvement in the raw materials of the spunbond layer and the elastic intermediate layer. The first spun-bonded layer and the second spun-bonded layer are prepared from spun-bonded layer raw materials consisting of soft master batches and polypropylene slices, and the elastic middle layer is prepared from elastic layer raw materials consisting of an elastomer, smooth master batches and polypropylene slices.
In the spunbond layer raw material, the soft master batch accounts for 1-5%, preferably 2-4%, more preferably 3% of the total weight of the spunbond layer raw material. The soft master batch comprises 46-50 parts by weight of polypropylene homopolymer, 22-27 parts by weight of fatty amide, 25-30 parts by weight of polyvinyl alcohol and 1-2 parts by weight of phosphite antioxidant; preferably, the softening masterbatch comprises 47 parts by weight of polypropylene homopolymer, 26 parts by weight of fatty amide, 26 parts by weight of polyvinyl alcohol and 1 part by weight of phosphite antioxidant. The soft master batch of the invention has no special requirements on the preparation method, and the soft master batch can be prepared by adopting a conventional method by a person skilled in the art, for example, after the raw materials are mixed in a high-speed mixer, a double-screw extruder is adopted for melt blending, and then the soft master batch can be prepared by shearing, drawing into strips, granulating, drying, packaging and the like of screws. Generally, the inventive softening concentrate can be prepared according to the following physical parameter characteristics: cylindrical particles, the weight of the particles is 68-88 particles/g, the melt index at 230 ℃ is 1000-2000g/10min, and the bulk density is 50-65g/100 ml. Alternatively, the soft concentrate used in the present invention may be a commercially available product, such as GA530M available from the company foshanbao.
In the elastic layer raw material, the polypropylene chips account for 1% to 5%, preferably 2% to 4%, more preferably 3% of the total weight of the elastic layer raw material. The smooth master batch accounts for 1-5%, preferably 2-4% and more preferably 3% of the total weight of the raw materials of the elastic layer. The smooth master batch comprises 43-48 parts by weight of polypropylene homopolymer, 28-31 parts by weight of fatty amide, 20-24 parts by weight of polyvinylpyrrolidone and 3-5 parts by weight of phosphite antioxidant; preferably, the slip masterbatch comprises 45.5 parts by weight of polypropylene homopolymer, 28.5 parts by weight of fatty amide, 23 parts by weight of polyvinylpyrrolidone and 3 parts by weight of phosphite antioxidant. The smooth master batch of the invention has no special requirements on the preparation method, and the master batch can be prepared by adopting a conventional method by a person skilled in the art, for example, after the raw materials are mixed in a high-speed mixer, a double-screw extruder is adopted for melt blending, and then the smooth master batch can be prepared by shearing, drawing into strips, granulating, drying, packaging and the like of screws. In general, the slip concentrate of the present invention can be prepared according to the following physical parameter characteristics: cylindrical particles, 68-88 particles/g of particles, 1100g/10min of melt index at 230 ℃ and 50-65g/100ml of bulk density. Alternatively, the slip concentrate used in the present invention may be a commercially available product, such as HS560 available from Foshan Baole, Inc.
In the present invention, the polypropylene chips are conventional raw materials and have the general formula
Figure BDA0001448200730000071
The average molecular weight is 200000 to 600000, and is generally commercially available, and for example, polypropylene resin of PP3155E5 by exxon meifu corporation, polypropylene resin of "kunlun" by trademark of china oil and gas corporation and of H39S-2 by trademark of "kunlun" by china oil and gas corporation, or polypropylene resin of PPH-Y35X by luyang division by corporation of china petrochemical corporation, may be used in the present invention.
In the present invention, the elastomer is a polymer consisting of repeating monomers of isotactic polypropylene with randomly distributed ethylene, wherein the elastomer contains from 10% to 20% by weight of randomly distributed ethylene. The elastomer has an average molecular weight of 300000 to 800000, a molecular weight distribution of 3 to 4, and a melt index (230 ℃, 2.16kg) of 20g/10min to 48g/10 min. In actual production, the elastomer can be prepared by a person skilled in the art by conventional polymerization methods, depending on the relevant parameter values required. Alternatively, commercially available products such as widamel 6202FL and widamel 7050FL available from exxon mobil corporation may be used as the elastomer. The melt index in the present invention is based on ASTM D1238.
In the present invention, the polypropylene homopolymer used in the soft and smooth master batches is a conventional material and has the general formula
Figure BDA0001448200730000081
The average molecular weight is 200000 to 600000, and is usually a conventional commercially available polypropylene resin, for example, PP3155E5 from exxon meifu. The fatty amide may be any one or more of erucamide, lauramide, oleamide and stearamide, and is typically commercially available, for example, from Changsha, Hunan chemical Limited. The polyvinyl alcohol is medical grade polyvinyl alcohol, which is different from chemical grade polyvinyl alcohol, is a high molecular substance with extremely high safety, no toxicity to human bodies, no side effect and good biocompatibility, wherein the medical grade (or called medical grade) is defined according to the standard of the 2015 edition of Chinese pharmacopoeia. Phosphite antioxidants are one of the antioxidants that retard the oxidation of polymeric materials and extend product life by decomposing peroxides produced during oxidation to form stable inactive products, and are commonly commercially available in the present invention, such as those available from Guangzhou national chemical Co., Ltd
Figure BDA0001448200730000082
3010 series. The polyvinylpyrrolidone is commercially available, for example, from JiangyinThe company of Industrial Co, Ltd.
The production method provided by the second aspect of the present invention is explained in detail below.
(1) Preparation of spunbond layer webs
The spunbond layer stock was fed to the S1 and S3 dies, respectively. And (3) sucking the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 180-270 ℃ to obtain a hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 5-10 MPa. The distributed hot melt is sprayed out of the filaments through a spinneret plate with the aperture of 0.3-0.8mm, and the filaments are cooled through a side cold air cooling system with the temperature of 10-20 ℃ and the air speed of 0.2-1.5m/s, so as to obtain the nascent filaments. The primary filament is drafted by air flow with the drafting speed of 2000m/min-5000m/min through the horn mouth of the drafter to obtain the fiber with the fineness of 1.8-2.2 denier, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(2) Preparation of elastic layer webs
The above raw materials for the elastic layer were fed into an S2 die. And (3) sucking the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 180-270 ℃ to obtain a hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 5-10 MPa. The distributed hot melt is sprayed out of the filaments through a spinneret plate with the aperture of 0.3-0.8mm, and the filaments are cooled through a side cold air cooling system with the temperature of 10-20 ℃ and the air speed of 0.2-1.5m/s, so as to obtain the nascent filaments. The primary filament is drafted by air flow with the drafting speed of 2000m/min-5000m/min through the horn mouth of the drafter to obtain the fiber with the fineness of 1.8-2.2 denier, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(3) Thermocompression bonding
And (2) paving the fibers obtained by devillicating in the step (1) on a net forming curtain, arranging an exhaust fan below the net forming curtain, and fixing the fibers on the net forming curtain to form a lower layer (a first spun-bonded layer) by downward suction. And (3) subsequently, laying the fibers obtained by the devillicate in the step (2) on a net forming curtain, fixing the fibers on the net forming curtain by downwards sucking air through an exhaust fan to form an elastic middle layer, and then forming a layer of fiber net on the middle layer as an upper layer (a second spunbond layer) according to a method for forming a lower layer. The three layers of fiber webs are driven by the mesh curtain roller to be transmitted to a hot rolling mill, the temperature of the hot rolling mill is set to be 130-150 ℃, the linear pressure is set to be 30-70MPa, and the three layers of fiber webs form non-woven fabrics under the hot-pressing bonding effect of an upper roller and a lower roller of the hot rolling mill.
In order to realize that the first spunbond layer and the second spunbond layer respectively account for 15-20% of the weight of the elastic nonwoven fabric, in the step (1) and the step (2), the weight ratio of hot melt of the raw materials of the spunbond layers to hot melt of the raw materials of the elastic layers after metering and distribution is 3-5:11-14 by adjusting the metering pump, namely, the weight ratio of the raw materials for preparing the first spunbond layer, the elastic middle layer and the second spunbond layer after metering and distribution is 3-5: 11-14: 3-5.
The manufacturing equipment adopted by the invention is conventional equipment, the adopted die heads are S die heads, and the feeding system, the screw extruder, the filtering system, the metering pump, the spinneret plate, the side cold air cooling system and the drafting device are all three groups and are respectively used for preparing a first spunbond layer fiber web, an elastic middle layer fiber web and a second spunbond layer fiber web. When elastic non-woven fabrics with different gram weights are prepared, the method is mainly realized by adjusting the overall speed of equipment, and is a conventional method in the field.
In the invention, although the spunbond layer fiber web and the elastic layer fiber web are both prepared by a spunbond method, different raw material proportions are adopted in the specific preparation process, and the functions of the spunbond layer fiber web and the elastic layer fiber web are mainly as follows: the spun-bonded layer fiber web does not adopt an elastomer, only adopts the soft master batches and the polypropylene slices, so that the cloth cover can not be adhered when the non-woven fabric finished product is wound and in the subsequent application process, thereby being beneficial to the subsequent operations such as cutting and the like, and in the specific application process of the non-woven fabric, the spun-bonded layer fiber web can realize better bonding effect, effectively prevent falling off and further ensure the quality of downstream products; the elastic layer fiber web adopts an elastomer with a high proportion, and smooth master batches and polypropylene slices are added, so that the non-woven fabric can have enough elasticity, and the hot-pressing adhesion of the middle layer and the two surface layers is facilitated; in addition, the intermediate layer and the surface layer adopt different raw material ratios, so that the process is optimized, and the production cost is reduced.
The non-woven fabric product has excellent elasticity and can completely meet the requirement of medical sanitary materials on elasticity. Accordingly, a third aspect of the present invention provides the use of the above elastic nonwoven for the preparation of a medical hygiene material.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1: preparation of 35g activated elastic non-woven fabric
(1) Preparation of spunbond layer webs
10 kg of a spunbond raw material composed of 3 wt% of a soft mother particle (GA530) and 97 wt% of polypropylene chips (Exxon Mobil Co., PP3155E5) was charged into 5 kg of each of S1 and S3 dies. And (3) pumping the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 220-250 ℃ to obtain a hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 7-10 MPa. The distributed hot melt is sprayed out of filaments through a spinneret plate with the aperture of 0.5mm, and the filaments are cooled through a side cold air cooling system with the temperature of 10-15 ℃ and the air speed of 1.0-1.5m/s, so as to obtain nascent filaments. The primary filament is drafted by air flow with the drafting speed of 3000-4000 m/min through the horn mouth of the drafter to obtain fiber, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(2) Preparation of elastic layer webs
20 kg of an elastic layer raw material composed of 94 wt% of an elastomer (exxonmobil, dadmami 7050FL), 3 wt% of a slip master batch (HS560) and 3 wt% of an elastic layer polypropylene chip (exxonmobil, PP3155E5) was charged into an S2 die. And (3) pumping the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 220-250 ℃ to obtain a hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 7-10 MPa. The distributed hot melt is sprayed out of the filaments through a spinneret plate with the aperture of 0.3-0.6mm, and the filaments are cooled through a side cold air cooling system with the temperature of 10-15 ℃ and the air speed of 1.0-1.5m/s, so as to obtain the nascent filaments. The primary filament is drafted by air flow with the drafting speed of 3000-4000 m/min through the horn mouth of the drafter to obtain fiber, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(3) Thermocompression bonding
And (2) paving the fibers obtained by devillicating in the step (1) on a net forming curtain, arranging an exhaust fan below the net forming curtain, and fixing the fibers on the net forming curtain to form a lower layer (a first spun-bonded layer) by downward suction. And (3) subsequently, laying the fibers obtained by the devillicate in the step (2) on a net forming curtain, fixing the fibers on the net forming curtain by downwards sucking air through an exhaust fan to form an elastic middle layer, and then forming a layer of fiber net on the middle layer as an upper layer (a second spunbond layer) according to a method for forming a lower layer. The three layers of fiber webs are driven by the mesh curtain roller to be transmitted to the hot rolling mill, the temperature of the hot rolling mill is set to be 101-117 ℃, the linear pressure is set to be 50-60MPa, and the three layers of fiber webs form the non-woven fabric under the hot-pressing bonding effect of the upper roller and the lower roller of the hot rolling mill.
The number of revolutions of the metering pump in steps (1) and (2) was adjusted to 4/13/3 so that the weight ratio of the raw materials for preparing the first spunbond layer, the elastic intermediate layer and the second spunbond layer after metering and dispensing was 4: 13: 3. The overall vehicle speed of the device is 50 m/min.
Example 2: preparation of 45g activated elastic non-woven fabric
(1) Preparation of spunbond layer webs
10 kg of a spunbond raw material composed of 4 wt% of a soft mother particle (GA530) and 96 wt% of polypropylene chips (Exxon Mobil Co., PP3155E5) was charged into 5 kg of each of S1 and S3 dies. And (3) sucking the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 180-210 ℃ to obtain the hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 5-8 MPa. The distributed hot melt is sprayed out of filaments through a spinneret plate with the aperture of 0.3mm, and the filaments are cooled through a side cold air cooling system with the temperature of 15-20 ℃ and the air speed of 0.6-1.0m/s, so as to obtain nascent filaments. The primary filament is drafted by air flow with the drafting speed of 3000-4000 m/min through the horn mouth of the drafter to obtain fiber, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(2) Preparation of elastic layer webs
20 kg of an elastic layer raw material composed of 94 wt% of an elastomer (exxonmobil, dadmami 7050FL), 2 wt% of a slip master batch (HS560) and 4 wt% of an elastic layer polypropylene chip (exxonmobil, PP3155E5) was charged into an S2 die. And (3) sucking the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 180-210 ℃ to obtain the hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 5-8 MPa. The distributed hot melt is sprayed out of filaments through a spinneret plate with the aperture of 0.3mm, and the filaments are cooled through a side cold air cooling system with the temperature of 15-20 ℃ and the air speed of 0.6-1.0m/s, so as to obtain nascent filaments. The primary filament is drafted by air flow with the drafting speed of 3000-4000 m/min through the horn mouth of the drafter to obtain fiber, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(3) Thermocompression bonding
And (2) paving the fibers obtained by devillicating in the step (1) on a net forming curtain, arranging an exhaust fan below the net forming curtain, and fixing the fibers on the net forming curtain to form a lower layer (a first spun-bonded layer) by downward suction. And (3) subsequently, laying the fibers obtained by the devillicate in the step (2) on a net forming curtain, fixing the fibers on the net forming curtain by downwards sucking air through an exhaust fan to form an elastic middle layer, and then forming a layer of fiber net on the middle layer as an upper layer (a second spunbond layer) according to a method for forming a lower layer. The three-layer fiber web is driven by a net curtain roller to be transmitted to a hot rolling mill, the temperature of the hot rolling mill is set to be 90-110 ℃, the linear pressure is set to be 50-60MPa, and the three-layer fiber web forms non-woven fabric under the hot-pressing bonding effect of an upper roller and a lower roller of the hot rolling mill.
The number of revolutions of the metering pump in steps (1) and (2) was adjusted to 4/13/3 so that the weight ratio of the raw materials for preparing the first spunbond layer, the elastic intermediate layer and the second spunbond layer after metering and dispensing was 4: 13: 3. The overall vehicle speed of the device is 36.2 m/min.
Example 3: preparation of 70g activated elastic non-woven fabric
(1) Preparation of spunbond layer webs
10 kg of a spunbond layer raw material composed of 2 wt% of a soft mother particle (GA530) and 98 wt% of a polypropylene chip (Exxon Mobil Co., PP3155E5) was charged into 5 kg of each of S1 and S3 dies. And (3) sucking the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 240-270 ℃ to obtain a hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 7-10 MPa. The distributed hot melt is sprayed out of filaments through a spinneret plate with the aperture of 0.8mm, and the filaments are cooled through a side cold air cooling system with the temperature of 10-15 ℃ and the air speed of 0.2-0.5m/s, so as to obtain nascent filaments. The primary filament is drafted by air flow with the drafting speed of 3000-4000 m/min through the horn mouth of the drafter to obtain fiber, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(2) Preparation of elastic layer webs
20 kg of an elastic layer raw material composed of 94 wt% of an elastomer (Exxon Mobil, Widamet 7050FL), 4 wt% of a slip master batch (HS560) and 2 wt% of an elastic layer polypropylene chip (Exxon Mobil, PP3155E5) was charged into an S2 die. And (3) sucking the mixed and stirred raw materials into a screw extruder through a feeding system in vacuum, and extruding and melting the raw materials at the screw melting temperature of 240-270 ℃ to obtain a hot melt. Subsequently, the hot melt is filtered, metered and dispensed by a filtration system and a metering pump at an operating temperature of 230 ℃ and 250 ℃ and a pressure of 7-10 MPa. The distributed hot melt is sprayed out of filaments through a spinneret plate with the aperture of 0.8mm, and the filaments are cooled through a side cold air cooling system with the temperature of 10-15 ℃ and the air speed of 0.2-0.5m/s, so as to obtain nascent filaments. The primary filament is drafted by air flow with the drafting speed of 3000-4000 m/min through the horn mouth of the drafter to obtain fiber, and the molecular chains of the drafted primary filament are arranged orderly to generate strong force to form the fiber.
(3) Thermocompression bonding
And (2) paving the fibers obtained by devillicating in the step (1) on a net forming curtain, arranging an exhaust fan below the net forming curtain, and fixing the fibers on the net forming curtain to form a lower layer (a first spun-bonded layer) by downward suction. And (3) subsequently, laying the fibers obtained by the devillicate in the step (2) on a net forming curtain, fixing the fibers on the net forming curtain by downwards sucking air through an exhaust fan to form an elastic middle layer, and then forming a layer of fiber net on the middle layer as an upper layer (a second spunbond layer) according to a method for forming a lower layer. The three-layer fiber web is driven by a net curtain roller to be transmitted to a hot rolling mill, the temperature of the hot rolling mill is set to be 90-110 ℃, the linear pressure is set to be 50-60MPa, and the three-layer fiber web forms non-woven fabric under the hot-pressing bonding effect of an upper roller and a lower roller of the hot rolling mill.
The number of revolutions of the metering pump in steps (1) and (2) was adjusted to 4/13/3 so that the weight ratio of the raw materials for preparing the first spunbond layer, the elastic intermediate layer and the second spunbond layer after metering and dispensing was 4: 13: 3. The overall vehicle speed of the device is 24.6 m/min.
Example 4: preparation of 90g activated elastic non-woven fabric
The process is the same as example 1, except that: the adopted soft master batch comprises the following components: 47 parts by weight of polypropylene homopolymer, 26 parts by weight of erucamide, 26 parts by weight of polyvinyl alcohol and 1 part by weight of phosphite antioxidant; the adopted smooth master batch comprises the following components: 45.5 parts of polypropylene homopolymer, 28.5 parts of lauramide, 23 parts of polyvinylpyrrolidone and 3 parts of phosphite antioxidant; the overall vehicle speed of the device is 18 m/min.
Example 5: preparation of 120g activated elastic non-woven fabric
The process is the same as example 1, except that: the adopted soft master batch comprises the following components: 50 parts of polypropylene homopolymer, 23 parts of lauramide, 30 parts of polyvinyl alcohol and 2 parts of phosphite antioxidant; the adopted smooth master batch comprises the following components: 47 parts of polypropylene homopolymer, 28 parts of stearic amide, 20 parts of polyvinylpyrrolidone and 5 parts of phosphite antioxidant; the overall vehicle speed of the device is 14 m/min.
Example 6: preparation of 150g activated elastic nonwoven Fabric
The process is the same as example 1, except that: the adopted soft master batch comprises the following components: 46 parts of polypropylene homopolymer, 22 parts of erucamide, 30 parts of polyvinyl alcohol and 2 parts of phosphite antioxidant; the adopted smooth master batch comprises the following components: 43 parts of polypropylene homopolymer, 31 parts of lauramide, 21 parts of polyvinylpyrrolidone and 5 parts of phosphite antioxidant; the overall vehicle speed of the device is 10.8 m/min.
The nonwoven fabric products of examples 1-6 were tested and the results are shown in Table 1.
TABLE 1
Figure BDA0001448200730000141
The nonwoven fabric products of examples 1-6 were activated by the speed differential of the draw rolls and tested for elastic properties in the nonwoven fabric products of examples 1-6 as follows: each of the elastic nonwoven fabric samples of examples 1 to 6 was prepared in 4 portions, having a size of 50mm x 150mm (MD x CD, machine direction x transverse direction) and a distance of 100mm between the clamps of the tensile tester. The sample was stretched at a rate of 500mm/min to a 100% elongation state, the tension data (N) in the process was measured, after waiting for 30 seconds, the jig was naturally returned to the initial state, the rebound force (N) of the sample in the process and the final deformation amount (%) as compared with the initial state were measured, and the average values were calculated for each of the elastic nonwoven fabric samples of examples 1 to 6, and the results are shown in table 2.
TABLE 2
Figure BDA0001448200730000151
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are intended to be included within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.

Claims (14)

1. An elastic non-woven fabric is characterized by comprising a first spun-bonded layer, an elastic middle layer and a second spun-bonded layer which are sequentially laminated; the surface density of the elastic non-woven fabric is 35-150g/m2Transverse tensile strength of 5.9-67.1N/50mm, longitudinal tensile strength of 19.7-174.1N/50mm, transverse elongation at break of 255.0-600.0%, and longitudinal elongation at break of 69.0-397.0%;
the elastic non-woven fabric is prepared by a method comprising the following steps:
(1) preparation of spunbond layer web: mixing, extruding and melting, spinning and dividing and lapping spunbond layer raw materials consisting of soft master batches and polypropylene slices to obtain a spunbond layer fiber web;
(2) preparation of elastic layer web: mixing, extruding and melting, spinning and dividing and lapping elastic layer raw materials consisting of an elastomer, smooth master batches and polypropylene slices to obtain an elastic layer fiber web;
(3) bonding: taking the elastic layer fiber web as an elastic middle layer, taking the spunbond layer fiber web as a first spunbond layer and a second spunbond layer, and carrying out hot-pressing bonding on the three layers of fiber webs to obtain elastic non-woven fabric;
wherein in the step (1), the soft master batch accounts for 1-5% of the total weight of the raw materials of the spunbond layer; in the step (2), the smooth master batch accounts for 1-5% of the total weight of the raw materials of the elastic layer, and the polypropylene slices account for 1-5% of the total weight of the raw materials of the elastic layer;
wherein, the soft master batch comprises 46 to 50 weight portions of polypropylene homopolymer, 22 to 27 weight portions of fatty amide, 25 to 30 weight portions of polyvinyl alcohol and 1 to 2 weight portions of phosphite antioxidant; the smooth master batch consists of 43-48 parts by weight of polypropylene homopolymer, 28-31 parts by weight of fatty amide, 20-24 parts by weight of polyvinylpyrrolidone and 3-5 parts by weight of phosphite antioxidant;
wherein the first spunbond layer and the second spunbond layer respectively account for 15-20% of the weight of the elastic non-woven fabric.
2. The elastic nonwoven of claim 1 wherein the first extension force in the cross direction of the elastic nonwoven is from 7.43 to 28.89N, the first retraction force is from 4.1 to 16.4N, the first 50% retraction force is from 0.2 to 1.0N, the first deformation ratio is from 24% to 33%, the second extension force is from 6.7 to 25.4N, the second retraction force is from 4.1 to 16.4N, the second 50% retraction force is from 0.2 to 1.0N, and the second deformation ratio is from 28% to 35%.
3. The elastic nonwoven of claim 1 wherein the first extension force in the machine direction of the elastic nonwoven is from 15.44 to 73.73N, the first retraction force is from 8.4 to 39.8N, the first 50% retraction force is from 0.2 to 1.3N, the first deformation ratio is from 27% to 42%, the second extension force is from 14.1 to 66.3N, the second retraction force is from 8.4 to 39.8N, the second 50% retraction force is from 0.2 to 1.3N, and the second deformation ratio is from 30% to 44%.
4. A method of preparing an elastic nonwoven fabric according to any of claims 1 to 3, comprising the steps of:
(1) preparation of spunbond layer web: mixing, extruding and melting, spinning and dividing and lapping spunbond layer raw materials consisting of soft master batches and polypropylene slices to obtain a spunbond layer fiber web;
(2) preparation of elastic layer web: mixing, extruding and melting, spinning and dividing and lapping elastic layer raw materials consisting of an elastomer, smooth master batches and polypropylene slices to obtain an elastic layer fiber web;
(3) bonding: taking the elastic layer fiber web as an elastic middle layer, taking the spunbond layer fiber web as a first spunbond layer and a second spunbond layer, and carrying out hot-pressing bonding on the three layers of fiber webs to obtain elastic non-woven fabric;
in the step (1), the soft master batch accounts for 1-5% of the total weight of the raw materials of the spunbond layer; in the step (2), the smooth master batch accounts for 1-5% of the total weight of the raw materials of the elastic layer, and the polypropylene slices account for 1-5% of the total weight of the raw materials of the elastic layer.
5. The method according to claim 4, wherein in step (1), the softening mother granules account for 2-4% of the total weight of the raw materials of the spunbond layer.
6. The method of claim 5, wherein in step (1), said softening mother particles account for 3% of the total weight of said raw materials of said spunbond layer.
7. The preparation method according to claim 4, wherein in the step (2), the smooth master batch accounts for 2-4% of the total weight of the raw materials of the elastic layer; the polypropylene slices account for 2% -4% of the total weight of the raw materials of the elastic layer.
8. The method according to claim 7, wherein in the step (2), the smooth master batch accounts for 3% of the total weight of the raw materials of the elastic layer.
9. The production method according to claim 7, wherein in the step (2), the polypropylene chips account for 3% by weight of the total weight of the raw material for the elastic layer.
10. The method of claim 4, wherein the softening mother granules comprise 46-50 parts by weight of polypropylene homopolymer, 22-27 parts by weight of fatty amide, 25-30 parts by weight of polyvinyl alcohol and 1-2 parts by weight of phosphite antioxidant.
11. The method as claimed in claim 4, wherein the elastomer is composed of a repeating monomer of isotactic polypropylene and randomly distributed ethylene, has an average molecular weight of 300000-.
12. The preparation method of claim 4, wherein the smooth masterbatch comprises 43-48 parts by weight of polypropylene homopolymer, 28-31 parts by weight of fatty amide, 20-24 parts by weight of polyvinylpyrrolidone and 3-5 parts by weight of phosphite antioxidant.
13. The method of claim 4, wherein the weight ratio of the spunbond layer raw material to the elastic layer raw material is 3-5: 11-14.
14. Use of the elastic nonwoven according to any one of claims 1 to 3 for the production of medical hygiene materials.
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Denomination of invention: Elastic non-woven fabric and its preparation method and Application

Effective date of registration: 20220331

Granted publication date: 20200707

Pledgee: Guangrao County sub branch of Postal Savings Bank of China Ltd.

Pledgor: SHANDONG HENGPENG HYGIENIC PRODUCTS CO.,LTD.

Registration number: Y2022980003570