KR100649073B1 - Spunbonded non-woven fabric having high drapability and manufacturing method thereof - Google Patents

Abstract

A spun bond non-woven fabric having high drapability and a manufacturing method thereof are provided to apply the hygiene or medical treatment or slip prevention field. A master batch containing low viscosity polydimethyl siloxane of 10-50 weight % is manufactured. The manufactured master batch of 2-20 weight % and a long fiber manufacture polymer of 98-80 weight % are injected, melted and spun. The long fiber web with above single layer is formed by the melt spun method. The formed web is stabilized by a thermal bonding process. The ling fiber manufacture polymer is one selected from a group consisting of polyolefin, polyester, polyamide and the mixture thereof.

Description

Long fiber spanbonded nonwoven fabric with excellent drape property and manufacturing method thereof {SPUNBONDED NON-WOVEN FABRIC HAVING HIGH DRAPABILITY AND MANUFACTURING METHOD THEREOF}

The present invention relates to a long-fiber spanbond nonwoven fabric having excellent drape property and a method for manufacturing the same, and more particularly, to improve fluid barrier performance according to the manufacture of a composite nonwoven fabric and to have excellent drape property. In addition, the present invention relates to a long-fiber spanbond nonwoven fabric having excellent drape property, which can be usefully applied to hygiene fields such as diapers, diapers for diapers, adult incontinence diapers, sanitary napkins, medical fields, and non-slip areas, and a method of manufacturing the same.

In general, the spunbond nonwoven fabric, which is a long fiber nonwoven fabric, is used in various fields because of its excellent mechanical and aerodynamic properties and high productivity by continuous spinning. The most applicable areas are for sanitary materials, agricultural, living materials, industrial and medical. In particular, the spunbond nonwoven fabric using polypropylene resin among polyolefin resins is widely used in sanitary materials such as disposable diapers and sanitary napkins with excellent flexibility compared to polyamide-based polyester resins.

Such long fiber nonwovens are commonly known as "spunbond nonwovens" or "meltspuns". That is, spunbond, meltblown, and combinations thereof. The long-fiber nonwoven fabric is generically produced by the melt spun method, and is generally manufactured by melting and spinning polyolefin-based resin and polyamide-based resin to form a web and forming a web to produce a nonwoven fabric by a thermal bonding method. In addition to thermal bonding, the coupling method is also known as water flow coupling, needle punching, ultrasonic bonding, hot air bonding and chemical bonding is also possible. Short-fiber nonwoven fabrics, which are distinguished from long-fiber nonwoven fabrics, are composed of staple fibers that form webs by cutting or aerated methods, and the bonding method is similar to that of long-walled nonwoven fabrics.

Recently, as the standard of living improves, there is an increasing demand for improving the feel of the nonwoven fabric that comes into contact with the skin. To this end, in Korean Patent Application No. 2000-033191, in manufacturing a polypropylene long fiber nonwoven fabric containing a fatty acid amide compound, it is intended to improve flexibility by controlling the surface friction coefficient of the nonwoven fabric. In Japanese Patent Laid-Open No. 10-88459, A heat-sealing composite long-fiber nonwoven fabric is produced using at least one resin having a low melting point or a softening point as a first component and a crystalline thermoreversible resin as a second component among the secondary copolymer and the olefin terpolymer. A long-fiber nonwoven fabric is proposed which contains a hydrocarbon lubricant in at least a first component and the content of the electric hydrocarbon lubricant is 2 to 20% by weight relative to the concentration in the fiber.

Meanwhile, the method of adding an additive to a nonwoven fabric is made of an additive raw material in the form of a master batch and supplied to the main raw material by a predetermined amount so that the additive is contained in the fiber and an emulsion in which the additive is dispersed with an aqueous medium is applied to the surface after the nonwoven fabric is formed. There is a method of expressing properties by remaining on the surface of the fiber after drying. Additive emulsions may be sprayed or coated or imparted by other methods. Surfactants and lubricants used as additives to enhance aesthetic tactile properties, such as flexibility and feel, may reduce hydrophobicity of the web, resulting in hydrophilic products not applicable to specific applications. Drape properties can also be reduced by drying with heat. In the US patent (Application No. 10-2003-7012318), amino-modified polydimethylsiloxane was dispersed in an aqueous medium as described above to improve drape through fiber surface modification.

In the case of the Japanese patent, a method of imparting a soft property by mixing a fatty acid amide compound is intended to reduce the surface friction coefficient by acting as an talcum material on the surface of the fiber rather than the flexibility of the non-woven fabric itself, the slip properties ( Slip (sliding property). In addition, the U.S. Patent discloses that the amino-modified polydimethylsiloxane is mixed with an aqueous medium, and the additives remain on the surface of the nonwoven fabric, thereby exhibiting drastic properties.The increase in stiffness by drying, or the spun bond or melt blown is combined. When applied to the melt spun composite nonwoven fabric, there is a problem in that the melt blown tissue is damaged and the required fluid barrier property is reduced.

The present invention has been made to solve the above problems, an object of the present invention is to solve the problem that the fluid blocking performance is reduced by the drag properties and the production of the composite nonwoven fabric is a low viscosity polydimethylsiloxane is dispersed master By mixing the batch and polyolefin polymer, low viscosity polydimethylsiloxane is dispersed in the fibers constituting the long fiber nonwoven fabric, so that the drape property is excellent, and thus, baby diapers, back practice diapers and adult incontinence diapers, It is an object of the present invention to provide a long fiber spanbonded nonwoven fabric having excellent drape property, which can be usefully applied to a sanitary field such as a sanitary napkin, a medical field, and a non-slip field.

In order to achieve the above object, the long fiber spanbonded nonwoven fabric having excellent drape property according to an embodiment of the present invention includes 2 to 20% by weight of a masterbatch containing 10 to 50% by weight of low viscosity polydimethyl siloxane and a polymer made of long fiber 98 A fiber composed of ˜80% by weight, which melt-spun and stretches a fiber having a low viscosity polydimethylsiloxane of 0.2-6.0% by weight to form a single layer or more long-fiber web by melt spun method, and then forms by thermal bonding process It is characterized by providing stability.

Preferably the low viscosity polydimethyl siloxane has the formula [(CH ₃ ) ₂ SiO ₂ ] m, wherein m is an integer of 3 to 12, more preferably the long fiber manufacturing polymer is a polyolefin, It is characterized in that any one selected from the group consisting of polyester, polyamide, copolymers thereof and mixtures thereof.

In addition, the method for producing a long fiber spanbond nonwoven fabric having excellent drape property according to another embodiment of the present invention for achieving the above object (A) preparing a master batch containing 10 to 50% by weight of low viscosity polydimethyl siloxane And (B) injecting 2 to 20% by weight of the prepared masterbatch and 98 to 80% by weight of the long fiber manufacturing polymer, and (C) melt spinning and stretching the masterbatch and the long fiber manufacturing polymer. And (D) forming a single fiber or longer filament web by the melt spun method, and (E) providing morphological stability to the formed web through a thermal bonding process.

Preferably the low viscosity polydimethyl siloxane is characterized in that 0.2 to 6.0% by weight contained in the fiber, and the low viscosity polydimethyl siloxane has a chemical formula [(CH ₃ ) ₂ SiO ₂ ] m, where m is It is an integer of 3 to 12, More preferably, the long-fiber production polymer is characterized in that any one selected from the group consisting of polyolefins, polyesters, polyamides, copolymers thereof and mixtures thereof.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention. These examples are only for illustrating the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention. .

In the method for producing a long fiber nonwoven fabric having excellent drastic properties according to the present invention, a master batch containing a low viscosity polydimethyl siloxane and a polyolefin-based resin, more specifically, a polypropylene polymer is mixed and melted at a predetermined ratio to spin and stretch into a filament and continuously Laminated on the belt to form a web and bonded with a calender capable of thermal compression is produced in the form of a sheet.

The master batch containing the low viscosity polydimethylsiloxane is a chip of a predetermined size by mixing a cyclic polydimethylsiloxane formed by cracking a siloxane hydrolyzate containing methyl silicate (CH ₃ SIO ₂ ) in the presence of an alkali catalyst with a polyolefin resin. CHIP), and the cyclic polydimethyl siloxane may be represented by the following Chemical Formula 1.

[Formula 1]

[(CH ₃ ) ₂ SiO ₂ ] m, where m is an integer from 3 to 12

The method of making the master batch is described in more detail. First of all, the blending process is carried out in a blender. 50-90% by weight of polymer selected from polypropylene resin (PP RESIN), polyester resin, polypropylene powder, polyester powder, nylon resin, nylon powder and mixtures thereof and low viscosity polydimethyl 10-50% by weight of siloxane is mixed, followed by a dispersion process, in which a mixture of polymer and low-viscosity polydimethylsiloxane is added to a hopper sequentially into a screw cylinder equipped with a feed screw, and then transferred through a screw. The water dispersed in is completely evaporated and the low viscosity polydimethylsiloxane is evenly dispersed in the polymer. Next, the spinning and cutting process is performed, and the polymer mixture in which the low-viscosity polydimethylsiloxane is dispersed is spun through a spinneret formed in the outlet and cut into a predetermined length to prepare a masterbatch mixed with polydimethylsiloxane.

In addition, in the method for producing a long fiber spanbond nonwoven fabric containing low viscosity polydimethylsiloxane according to the present invention, a masterbatch (including 10 to 50% by weight of polydimethylsiloxane, based on the total weight) of the masterbatch is manufactured. The dosing system for metering the raw materials is used to feed the extruder at a constant rate with the long fiber nonwoven manufacturing polymer (choose from resins such as polypropylene, polyethylene, polyester, nylon, and mixtures thereof). At this time, the input ratio of the master batch is preferably 2 to 20% by weight. When the batch rate of the master batch is less than 2% by weight, there is a problem that the weighing of the raw material must be made very precisely, and the siloxane content of the master batch must be high, and when the amount of the master batch exceeds 20% by weight, This is because there is a lot of input, which is a difficult problem. More preferably, the feed rate of the master batch is 5 to 10% by weight. Moreover, it is preferable that the long fiber nonwoven fabric manufacturing polymer is 98 to 80 weight%, and the content in fiber of low viscosity polydimethylsiloxane is 0.2 to 6.0 weight%.

The long fiber making polymer is a thermoplastic or spinnable polymer selected from the group consisting of polyolefins, polyesters, polyamides, copolymers thereof (olefins, esters, amides or other monomers) and mixtures thereof. The term "mixture" as used herein includes a homogeneous mixture of two or more polymers or a heterogeneous mixture of two or more physically distinct polymers, such as bi-comonents. Preferably the fibers are polyolefins selected from the group consisting of polyethylene, polypropylene, for example copolymers thereof, including polyethylene / polypropylene copolymers and polyethylene / polypropylene mixtures and mixtures thereof. Most preferably the polymer is polypropylene.

Next, the masterbatch and the filament-producing polymer are spun, and the filament is stretched by the pressure of air which is solidified by the cooling air injected through the honeycomb chamber and blown from the upper part and the air drawn under the conveyor belt. And laminated to a constant weight on the conveyor belt to form a web. The web may comprise a single layer (meltblown layer M, or spunbond layer S), a composite of two layers (SS or SM) or a composite layer of three or more layers (SMS, SMMS, SSMMS, SSMMSS web). Certain webs can vary greatly in weight (gsm) and this weight change can be adjusted by the amount of discharge per layer and the speed of the belt being conveyed.

Finally, the formed web is thermally bonded to impart mechanical properties and morphological stability. Although it does not limit the adhesion area, the calendar roll is composed of one side of the emboss roll, which usually has an adhesive area of 10 to 20% by weight, and the other side of the roll. The factors for effectively moving the additives contained in the filaments to the surface are heat and time. In the long fiber binding, the long fiber nonwoven web is joined by any process well known in the art, such as a process selected from the group consisting of chemical bonding (resin bonding), water flow bonding, and needle punching as well as the thermal bonding. Long fiber spanbonded nonwovens may be formed. Preferably thermal bonding. The nonwoven fabric according to the present invention comprises a low viscosity polydimethylsiloxane on the fiber to form a long fiber span web showing excellent drape properties and the low viscosity polydimethyl siloxane is preferably a cyclic polydimethylsiloxane.

Example 1

10% by weight of a masterbatch containing 20% by weight of low viscosity polydimethylsiloxane and 90% by weight of polypropylene resin were melted and spun to form a fiber and stretched on a porous conveyor belt to form a spunbond two-layer structure having a basis weight of 17 gsm. Fibrous spunbond nonwovens were prepared.

Example 2

10% by weight of a master batch containing 40% by weight of low viscosity polydimethylsiloxane and 90% by weight of polypropylene resin were melted and spun into fibers, and drawn on a porous conveyor belt. The basis weight was 17 gsm between the spanbond and the spanbond. A three-layer SMS nonwoven fabric was prepared with a meltblown layer.

Example 3

20% by weight of a master batch containing 30% by weight of low viscosity polydimethylsiloxane and 80% by weight of polypropylene resin were melted and spun to form a fiber and stretched on a porous conveyor belt. The basis weight was 17 gsm between the spanbond and the spanbond. A four-layer SMMS nonwoven fabric with a meltblown layer was prepared.

Comparative Example 1

A long fiber spanbonded nonwoven fabric having a spanbonded two-layer structure of the same structure as in Example 1 was prepared except that the masterbatch was not incorporated.

Comparative Example 2

A master batch having a low viscosity polydimethylsiloxane content of 10% by weight in the master batch was kneaded in 10% by weight to prepare a SMMS nonwoven fabric having a four-layer structure.

Various characteristics measurement and measurement results of each nonwoven table manufactured in the above examples and comparative examples were performed by the method shown below.

(1) Weight: EDANA 40.3-90

(2) Tensile strength and Elongation: EDANA 20.2 -89

(3) Drape (Bending Length): EDANA 50.5-99

The kneading ratios of the examples and comparative examples, polydimethylsiloxane (wt%) and long fiber nonwoven fabric in the masterbatch, and the like, and the measurement results are shown in Table 1 below.

TABLE 1

Item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 PP resin kneading ratio (wt%) 90 90 80 100 90 Masterbatch kneading ratio (% by weight) 10 10 20 0 10 Polydimethylsiloxane (% by weight) in masterbatch 20 40 30 - 10 Long fiber nonwoven fabric SS SMS SMMS SS SMMS Weight (gsm) 17 17 17 17 17 Strength (kg / 5cm) MD 3.8 3.2 4.0 3.8 3.8 CD 2.0 2.0 2.2 1.9 2.0 Elongation (%) MD 60 50 50 60 50 CD 70 60 60 70 60 Drape (mm) 25 30 32 43 45

As can be seen from Table 1, it can be seen that the nonwoven fabrics of Examples 1 to 3 according to the present invention have a relatively short bending length than the nonwoven fabrics of Comparative Examples 1 and 2 and have excellent drape.

In the present specification, only a few examples of various embodiments performed by the present inventors are described, but the technical idea of the present invention is not limited thereto, but may be variously modified and modified by those skilled in the art.

As described above, according to the present invention, the long-fiber spanbond nonwoven fabric having excellent drape property and the manufacturing method thereof have an effect such as excellent drape property and fluid blocking performance according to the preparation of the composite nonwoven fabric.

Therefore, according to the present invention, the long-fiber spanbond nonwoven fabric having excellent drape property and the manufacturing method thereof have hygienic fields such as infant diapers, back practice pants diapers, adult incontinence diapers, sanitary napkins, sanitary napkins, etc. There is an effect such that it can be usefully applied to the required field.

Claims (7)

A long fiber spanbond nonwoven fabric having excellent drape property, A fiber composed of 2 to 20% by weight of a masterbatch containing 10 to 50% by weight of low viscosity polydimethyl siloxane and 98 to 80% by weight of a long fiber polymer, wherein 0.2 to 6.0% by weight of the low viscosity polydimethylsiloxane in the fiber A long fiber spunbond nonwoven fabric having excellent drape property, wherein the fibers are melt-spun and stretched to form a single layer or more long fiber webs by a melt spun method, and then subjected to morphological stability by a thermal bonding process. The method of claim 1, The low viscosity polydimethyl siloxane has a chemical formula of [(CH ₃ ) ₂ SiO ₂ ] m, wherein m is an integer of 3 to 12, characterized in that the long fiber spanbond nonwoven fabric having excellent drape. The method according to claim 1 or 2, The long fiber manufacturing polymer, characterized in that any one selected from the group consisting of polyolefins, polyesters, polyamides, copolymers thereof, and mixtures thereof. In the manufacturing method of the long fiber spunbond nonwoven fabric excellent in drape property, (A) preparing a masterbatch containing 10 to 50% by weight of low viscosity polydimethyl siloxane, (B) adding 2 to 20% by weight of the prepared masterbatch and 98 to 80% by weight of a long fiber manufacturing polymer; (C) melt spinning and stretching the masterbatch and the long fiber making polymer, (D) forming a single fiber or more long-fiber web by melt spun method, (E) a method of producing a long-fiber spanbond nonwoven fabric having excellent drape property, comprising the step of imparting form stability to the formed web through a thermal bonding process. The method of claim 4, wherein The low-viscosity polydimethyl siloxane is 0.2 to 6.0% by weight in the fiber, characterized in that the manufacturing method of long fiber spanbond nonwoven fabric excellent in drape. The method of claim 5, The low viscosity polydimethyl siloxane has a chemical formula of [(CH ₃ ) ₂ SiO ₂ ] m, wherein m is an integer of 3 to 12, the method of producing a long fiber spunbond nonwoven fabric having excellent drape properties. The method according to any one of claims 4 to 6, The long fiber manufacturing polymer, characterized in that any one selected from the group consisting of polyolefins, polyesters, polyamides, copolymers thereof, and mixtures thereof, a method for producing a long fiber spunbond nonwoven fabric having excellent drape.