KR20080054937A - Antifungal polyolefin staple fiber and method for fabricating the same and thermal bonding non-woven using thereof - Google Patents

Abstract

An antifungal polyolefin staple fiber, a fabricating method thereof and a thermal bonding non-woven cloth by using the same are provided to have the properties of matter and to maintain the general properties of matter of the fiber and non-woven cloth. A polyolefin group resin is melted. Thereafter, the melted thing is spun at the spinning temperature of about 250 degrees in centigrade by the speed of about 1,500 to 2,000 m/min. The spun non-twisted yarn is drafted by the draft ratio of 1.35 to 1.65 at the pre-heat temperature of 50 to 80 degrees in centigrade. Thereafter, the winding shaft is offered to the drafted filament. Thereafter, in a surface treatment process, the liquid resin having the functional spinning emulsion and silver nano particles is injected to the filament with the winding shaft and solidified. After the heat fixation of the surface-treated filament, the filament is cut by a predetermined length. The polyolefin group resin is the antibacterial polyolefin group signal fiber as the homo polypropylene.

Description

Antifungal polyolefin-based short fibers and a method of manufacturing the same and a thermal bond nonwoven fabric using the same.Antifungal polyolefin staple fiber and method for fabricating the same and thermal bonding non-woven using

1 is a flow chart of the manufacturing process of the polyolefin-based short fibers according to an embodiment of the present invention.

The present invention relates to antimicrobial polyolefin short fibers, a method for manufacturing the same, and a thermal bond nonwoven fabric using the same, and in particular, polyolefins having improved physical properties such as adhesion as a short fiber for thermal bond nonwoven fabrics while providing antimicrobial and deodorizing properties using silver nanoparticles. It relates to a short fiber and a method of manufacturing the same and a thermal bond nonwoven fabric using the same.

Nonwoven fabrics are fabrics made by adhering or tangling fiber aggregates by mechanical or chemical treatment such as mechanical manipulation or heat bonding without weaving, weaving or knitting. Felts, resin bonded nonwovens, needle punches, spun bonds, spunlaces, embossed films, wet nonwovens, and the like. By narrowing, it means that the contact of the web (web) overlapped with the random (random) and the fiber is bonded by resin and used as a wick. Also called adhesive fabrics and bonded fabrics. Such a nonwoven fabric can be produced by various methods, such as needle punching method, chemical bonding method, thermal bonding method, melt blown method, spunlace method, stitch bond method, spunbond method is known.

On the other hand, the polyolefin-based nonwoven fabric is used as a sanitary article such as napkins and diapers because the touch is soft and high strength. In particular, polypropylene short fibers are processed into thermal bond nonwoven fabrics through calender bonding or air through bonding due to their unique low melting point and excellent chemical resistance, and are mainly used as surface materials for hygiene products such as diapers and sanitary napkins. Therefore, antibacterial and deodorant properties are very demanded.

In Japanese Patent Application Laid-Open No. 2002-235237, polypropylene heat-sealed nonwoven fabric is made of polysilicon acid salt as a masterbatch pellet as a crystallization inhibitor to impart soft touch and high tensile strength to the nonwoven fabric. However, experiments on spunbonded nonwovens differ from manufacturing methods of thermal bond nonwovens through short fibers. Spunbond nonwoven fabrics have a higher tensile strength than short fiber thermal bond nonwoven fabrics, but are softer in touch. In addition, according to the present technology, when the ethylene content is 1.5 wt% or more with respect to the spunbond nonwoven fabric made from the propylene / ethylene random copolymer, the crystallinity becomes low and may cause a decrease in strength of the nonwoven fabric. In addition, technical solutions to antimicrobial or deodorizing properties are not disclosed.

In addition, the Republic of Korea Patent Invention No. 627998 is prepared by adding silver nano to the body of the hollow fiber, based on the total weight 100% by weight of the hollow fiber having a particle size of 0.1 to 300nm hollow fiber at a ratio of 0.01 to 30% by weight A silver nano antibacterial hollow fiber with a silver nano coating film formed in a thickness of 0.01 μm to 50 μm in hollow pores was proposed. When the hollow fiber is used as the fiber itself, the antimicrobial effect may be expressed, but there is a problem in that a means for preventing thermal stability or deterioration of fiber properties is not proposed as a secondary processing material.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a polyolefin short fibers and antimicrobial deodorization endowed with a method for producing the same and a thermal bond nonwoven fabric using the same.

In another aspect, the present invention is to provide a polyolefin short fibers and a method of manufacturing the same, and a thermal bond nonwoven fabric using the same, which can maintain the physical properties of the fibers and nonwovens.

In order to achieve the above object, the present invention provides a method for producing a polyolefin short fiber, melting a polyolefin resin; Spinning the melt at a rate of about 1,500 to 2,000 m / min at a spinning temperature of about 250 ° C .; Stretching the spun untwisted yarn at a draw ratio of 1.35 to 1.65 and a preheating temperature of 50 to 80 ° C; Crimping to impart crimp to the stretched filaments; A surface treatment step of spraying and fixing the liquid resin containing the functional spinning oil and the silver nanoparticles to the crimped filaments; And a short fiber forming step of cutting the surface-treated filaments after heat setting and cutting the filament by a predetermined length.

The present invention also provides a method for producing antimicrobial polyolefin short fibers, wherein the polyolefin resin is homopolypropylene.

In addition, the present invention is the polyolefin resin is a homopolypropylene, the melt index (MI) of 4 to 30g / 10min, the isotactic index is 90 or more, the melting point (DSC) of the antimicrobial polyolefin short fibers of It provides a manufacturing method.

In another aspect, the present invention provides a method for producing an antimicrobial polyolefin-based short fibers wherein the liquid resin is further selected from the group consisting of silver nanoparticles and antioxidants, ultraviolet stabilizers, process stabilizers and colorants such as white pigments.

In another aspect, the present invention is a method for producing an antimicrobial polyolefin short fiber containing the homopolypropylene short fibers 99 to 99.5% by weight, the liquid resin of 0.5 to 1% by weight.

In another aspect, the present invention provides a method for producing antimicrobial polyolefin-based short fibers of the silver nano-particles contained in the liquid resin is 0.004 to 0.02% by weight.

In addition, the present invention is a coating layer made of a liquid resin is further formed on the surface of the short fiber, the liquid resin is further selected from the group consisting of colorants such as antioxidants, UV stabilizers, process stabilizers and white pigments with silver nanoparticles further It provides the included antimicrobial polyol reffin-based short fibers.

In addition, the present invention, the silver nanoparticles are contained in an amount of 0.004 to 0.02% by weight relative to the liquid resin, the liquid resin is an antimicrobial that is contained in the content of 99 to 99.5% by weight of polyolefin-based short fibers, 0.5 to 1% by weight of the liquid resin Provided is a polyolefin short fiber.

In the present invention, the polyolefin short fibers are homopolypropylene, and the antimicrobial polyolefin short fibers having a melt index (MI) of 4 to 30 g / 10 min, an isotactic index of 90 or more, and a melting point (DSC) of 160 to 165 ° C. To provide.

In another aspect, the present invention provides an antimicrobial polyolefin-based short fibers produced by the above method.

The present invention also provides an antimicrobial polyolefin-based nonwoven fabric produced by a thermal bonding method, using the antimicrobial polyolefin short fibers or polyolefin short fibers produced by the above method.

 The present invention also provides an antimicrobial polyolefin-based nonwoven fabric in which the thermal bonding method is a calender bonding method or an air through bonding method.

In another aspect, the present invention, the calender bonding method after the carding of short fibers at a speed of 80 to 150 mpm, to produce a non-woven web to pass through the web between the hot rolls set to about 140 ~ 165 ℃ heat fusion between fibers occurs It provides a prepared antimicrobial polyolefin-based nonwoven fabric.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values as are indicative of preparation and material tolerances inherent in the meanings mentioned, and are intended to be accurate or to facilitate understanding of the invention. Absolute figures are used to prevent unfair use by unscrupulous infringers.

As used herein, the term "nonwoven fabric" refers to a fabric, felt, and fibrous web made by bonding or tangling fiber aggregates by mechanical or chemical treatment such as mechanical manipulation or heat bonding without undergoing weaving, weaving, or knitting. use.

Figure 1 shows a process for producing a polyolefin-based short fibers according to an embodiment of the present invention.

Polyolefin-based short fibers according to a preferred embodiment of the present invention through the step of melting the polyolefin-based, to produce a non-drawn yarn by spinning the melt (spinning step). The spun unstretched yarn passes through a crimping step of imparting crimp to the stretched filament through the stretching step. The crimped filament is sprayed onto the fiber by a liquid spinning resin containing a functional spinning emulsion and silver nanoparticles (surface treatment step), and after heat setting, cut into a predetermined length to form a short fiber. (Short fiber formation step)

The raw material of the fiber according to the present invention is polyolefin-based and may preferably be homopolypropylene (hPP). The homopolypropylene preferably has a melt index (MI) of 4 to 30 g / 10 min, an isotactic index of 90 or more, and a melting point (DSC) of 160 to 165 ° C. The homopolypropylene short fibers may be used as a surface material of hygiene products such as diapers or sanitary napkins due to their unique low melting point and excellent chemical resistance.

The homopolypropylene is spun at a spinning speed of about 1,500 ~ 2,000 m / min at a spinning temperature of about 250 ℃, appropriately controlled at a draw ratio of 1.35 ~ 1.65, stretched to a preheating temperature of 50 ~ 80 ℃ and given crimping The hydrophilic spinning emulsion emulsion and the liquid resin containing silver ions are sprayed to attach the spinning emulsion to the fiber surface. After heat setting at about 100 to 120 ° C. for about 8 to 12 minutes, the fibers are cut to 40 mm in length and the final fiber fineness is 2 to 3 denier and the average elongation is 350 to 400%. Can be prepared.

Meanwhile, the liquid resin may further include one or more selected from the group consisting of colorants such as antioxidants, UV stabilizers, process stabilizers, and white pigments in addition to silver nanoparticles. The silver nanoparticles may be included in the range of 0.004 to 0.02% by weight relative to the liquid resin, the liquid resin may be included in the content of 99 to 99.5% by weight homopolypropylene short fibers, 0.5 to 1% by weight of the liquid resin have. If the particles are included in the less than the above range, there is a problem in the expression of antimicrobial, if the above range there is a problem of lowering the physical properties and productivity of the yarn during thermal bonding.

When a short fiber is produced by the method according to a preferred embodiment of the present invention, a thermal bond process for manufacturing a nonwoven fabric may be performed. The thermal bonding method may be performed using a calender bonding method and an air through bonding method. Calender bonding method is to produce a non-woven web after carding short fibers at a speed of 80 to 150 mpm, the heat between the fibers is produced by passing through the hot roll (Hot Roll) is set to about 140 ~ 165 ℃ Can be. In this case, the basis weight of the nonwoven fabric is preferably 20 to 30 gsm.

On the other hand, if foreign matters are attached to the surface of the fiber, bubbles are generated during fusion, which causes deterioration of the properties of the nonwoven fabric. At this time, silver nanoparticles may act as foreign matters. Therefore, proper content ratio of silver nanoparticles is important.

In the present invention, in manufacturing a thermal bond nonwoven fabric through a calender bonding facility, the hot roll temperature of hot roll is most suitable for the nonwoven fabric production rate, the shape of the embossed pattern of the roll, the difference between the roll setting temperature and the surface temperature, and the like. It is not an absolute result but a relative result because it may vary depending on the production equipment conditions of the calender bonding method and the fineness of the short fibers used as raw materials.

Example 1

 (Production of Polyolefin Short Fibers)

A homopolypropylene resin having a MI of 4 to 35 g / 10 min and a II of 90 wt% was prepared with a spinning temperature of about 250 ° C. and a spinning speed undrawn yarn of about 1,650 m / min, and the undrawn yarn was drawn at a draw ratio of about 1.40. Appropriately adjusted and preheated at about 80 ℃, crimped in the crimper, and sprayed with a hydrophilic spinning emulsion emulsion and a liquid resin containing silver nanoparticles, the spinning emulsion content being 0.55% by weight based on the total weight of short fibers ( The spinning emulsion is attached to the surface of the fiber so as to contain the concentration of silver nanoparticles: 0.004% by weight), and heat-fixed at 110 ° C. for about 8 to 12 minutes. Short polyolefin fibers were prepared with a fineness of 2.2 denier and an average elongation of 370%.

(Production of Polyolefin Thermal Bonding Nonwoven Fabric)

The polyolefin short fibers obtained by the above method were carded with a card machine at a speed of 95 mpm, a nonwoven web was produced, and passed through two hot rolls to prepare a calender-bonded nonwoven fabric having a basis weight of 22 gsm. At this time, while the temperature of the hot roll to 140 ~ 165 ℃ to find the optimum temperature of the non-woven fabric with the most excellent tensile strength heat fusion temperature (hereinafter referred to as the optimum hot roll temperature) to measure the physical properties.

Example 2

Work was carried out in the same manner as in Example 1, but changed to 0.01% by weight of the anion-containing liquid resin sprayed on homopolypropylene short fibers.

Example 3

Work was carried out in the same manner as in Example 1, but changed to 0.02% by weight of the anion-containing liquid resin sprayed on homopolypropylene short fibers.

Comparative Example 1

Operation was carried out in the same manner as in Example 1, but did not spray an anion-containing liquid resin.

Comparative Example 2

Work was carried out in the same manner as in Example 1, but changed to 0.05% by weight of anion-containing liquid resin sprayed on homopolypropylene short fibers.

* Method of Analysis

1. Melt Index (MI): According to ASTM D 1238

hPP and random copolymer series. 230 ℃, 2.16kg load

      * PE series such as HDPE, LDPE… 190 ℃, 2.16kg load

2. Isotactic Index (I.I): ISO 9113: 1986... Plastics-Polypropylene (PP) and propylene-copolymer thermoplastics-Determination of isotactic index .

3.Xylene Soluble (hereinafter referred to as XS): ISO 16152: 2005

4. Radioactivity: Evaluated by measuring the number of fiber breaks and the number of spin drops generated under the detention of 37,125 holes.

      However, trimming or dropping is less than once / hour: ◎

      However, trimming or dropping is 1 ~ 3 times / time: ○

      Only three times / time of drop or drop: △

      No radiation: ×

5. Elongation: Emissive during soft work

      Less than 1 time / hour: ○, 1 ~ 2 times / time: △, More than 3 times / hour: ×

6. Crimping workability: The number of times the stretched tow failed by passing through the crimper by visual observation.

      Less than 1 time / hour: ○, 1 ~ 2 times / time: △, More than 3 times / hour: ×

7. Single fiber fineness: Determination of fineness based on ASTM D1577

8. Non-woven carding property: When short fiber passes through carding machine, curling or flying phenomenon occurs between card rolls, or it is judged as bad when web formation is not good.

9. Basis weight: weight of nonwoven

10. Nonwoven fabric tensile strength and elongation: cut-strip method of JIS L 1096 (sample width 5cm, length 14cm)

      MD: Machine direction of nonwoven fabric

      CD: Lateral direction of nonwoven fabric

11.TBI (Thermal Bondability Index) = (MD strength × CD strength) 1/2 × (20 / base weight)

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Strength Kg / 5cm MD 4.80 4.78 4.75 4.77 3.91 CD 1.45 1.44 1.44 1.45 1.21 Elongation at Break% MD 60 60 60 60 51 CD 100 100 92 100 7

Table 1 evaluates the properties of the nonwoven fabrics prepared from the examples and the comparative examples, and as the silver nanoparticle content is increased, the strength and the elongation at break of the nonwoven fabric can be seen, in particular, in the case of Comparative Example 2 It can be seen that remarkable.

division BLANK Example 1 Strain 1 Initial bacterial count 1.6 X 10 ⁵ 1.6 X 10 ⁵ 24 hours later 7.2 X 10 ⁶ <10 (less than) Bacterial reduction rate - 99.9 Strain 2 Initial bacterial count 1.5X10 ⁵ 1.5X10 ⁵ 24 hours later 7.2 X 10 ⁶ <10 (less than) Bacterial reduction rate - 99.9 Strain 3 Initial bacterial count 1.3 X 10 ⁵ 1.3 X 10 ⁵ 24 hours later 6.4 X 10 ⁶ <10 (less than) Bacterial reduction rate - 99.9

* Increase: Strain 1-45 times

Strain 2-48 times

Strain 3-49 times

* Inoculation bacterial concentration: Strain 1-1.6X10 ⁵ / ml

Strain 2-1.5X10 ⁵ / ml

Strain 3-1.3X10 ⁵ / ml

* Type of nonionic surfactant: TWEEN 80 (0.05%)

* Exam conditions

-Test bacteria after shaking culture at 35 ± 1 ℃ for 24 hours (number of shaking 150 times / min)

-Sample surface area 60cm ²

* Neutralization solution: Phosphate buffer solution (pH 7.0 ± 0.2)

* Used strain: Strain 1 Escherichia coli ATCC 25922

Strain 2 Staphylococcus aureus ATCC 6538

Strain 3 Candida albicans ATCC 14053

As described above, the polyolefin-based short fibers according to an embodiment of the present invention, a method for preparing the same, and a thermal bond nonwoven fabric using the same exhibit excellent antibacterial and deodorizing properties.

In addition, the short fiber according to the present invention minimizes the deterioration of physical properties of the nonwoven fabrics such as air bubbles during the process of manufacturing the nonwoven fabric by thermal bonding by applying the optimal silver nanoparticles has little effect on the physical properties of the final product. have.

Therefore, the short fibers and nonwoven fabrics according to the present invention are not only suitable for hygiene products such as diapers, sanitary products, wet tissues, etc., but also have antibacterial and deodorizing properties, and thus can be applied as hygiene products having excellent functionality with prevention and deodorization of pathogens. have.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims (13)

In the method for producing a polyolefin short fiber, Melting a polyolefin-based resin; Spinning the melt at a rate of about 1,500 to 2,000 m / min at a spinning temperature of about 250 ° C .; Stretching the spun untwisted yarn at a draw ratio of 1.35 to 1.65 and a preheating temperature of 50 to 80 ° C; Crimping to impart crimp to the stretched filaments; A surface treatment step of spraying and fixing the liquid resin containing the functional spinning oil and the silver nanoparticles to the crimped filaments; And Method of producing an antimicrobial polyolefin-based short fibers comprising a short fiber forming step of cutting the surface-treated filament heat cut after a predetermined length. The method of claim 1, The polyolefin resin is a method for producing an antimicrobial polyolefin short fiber is homopolypropylene. The method of claim 1, The polyolefin resin is a homopolypropylene, the melt index (MI) of 4 to 30g / 10min, the isotactic index is 90 or more, the melting point (DSC) of 160 to 165 ℃ manufacturing method of antimicrobial polyolefin-based short fibers. The method of claim 1, The liquid resin is a method for producing an antimicrobial polyolefin based short fiber further comprising at least one selected from the group consisting of colorants such as antioxidants, UV stabilizers, process stabilizers and white pigments with silver nanoparticles. The method of claim 1, The method for producing an antimicrobial polyolefin short fiber, wherein the homopolypropylene short fiber is 99 to 99.5% by weight, and the liquid resin is contained in an amount of 0.5 to 1% by weight. The method of claim 5, Silver nano particles contained in the liquid resin is 0.004 to 0.02% by weight of the antimicrobial polyolefin-based short fiber manufacturing method. In the polyolefin short fiber, The coating layer made of liquid resin is further formed on the surface of the short fiber, The liquid resin is an antimicrobial polyolefin short fiber further comprising at least one selected from the group consisting of colorants such as antioxidants, UV stabilizers, process stabilizers and white pigments with silver nanoparticles. The method of claim 7, wherein The silver nanoparticles are contained in an amount of 0.004 to 0.02% by weight relative to the liquid resin, the liquid resin is an antimicrobial polyolefin short fiber containing 99 to 99.5% by weight of polyolefin-based short fibers, 0.5 to 1% by weight of the liquid resin . The method of claim 7, wherein The polyolefin short fiber is a homopolypropylene, an antimicrobial polyolefin short fiber having a melt index (MI) of 4 to 30 g / 10 min, an isotactic index of 90 or more, and a melting point (DSC) of 160 to 165 ° C. Antimicrobial polyolefin type short fiber manufactured by the method of any one of Claims 1-6. The antimicrobial polyolefin type nonwoven fabric manufactured by the thermal bonding method using the antimicrobial polyolefin type short fiber manufactured by the method of any one of Claims 1-6, or the short fiber of any one of Claims 7-9. . The method of claim 11, The thermal bonding method is an antimicrobial polyolefin-based nonwoven fabric which is a calendar bonding method or an air through bonding method. The method of claim 11, The calender bonding method is an antimicrobial polyolefin produced by thermally bonding between fibers while the short fibers are carded at a speed of 80 to 150 mpm, and then the non-woven web is made to pass through the hot rolls set to about 140 ~ 165 ℃ Non-woven.

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