KR20120059302A

KR20120059302A - Functional polyolefin staple fiber and method for fabricating the same and thermal bonding non-woven using thereof

Info

Publication number: KR20120059302A
Application number: KR1020100120978A
Authority: KR
Inventors: 최준혁
Original assignee: 코오롱글로텍주식회사
Priority date: 2010-11-30
Filing date: 2010-11-30
Publication date: 2012-06-08

Abstract

PURPOSE: A polyolefin filament and a method for fabricating the same are provided to enhance antibacterial, deodorizing, and moisturizing properties of a fabric. CONSTITUTION: A method for fabricating functional polyolefin-based filament comprises: a step of melting polyolefin-based resin; a step of spinning the melted material in a speed of 30-50 m/min; a step of drawing spun yarn at 50-80°C; a step of crimping the drawn filament; and a step of spraying liquid resin containing functional spinning emulsion and chitosan to the filament.

Description

Functional polyolefin-based short fibers and a method for manufacturing the same and a thermal bond nonwoven fabric using the same

The present invention relates to a functional polyolefin short fiber, a method for producing the same, and a thermal bond nonwoven fabric using the same, and in particular, to a polyolefin-based short fiber and a method for preparing the same, and a thermal bond nonwoven fabric having a functional antibacterial effect using chitosan.

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 fall into this category. 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 sanitary 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 Korea Patent Publication No. 1020010067991, chitosan powder is uniformly dispersed inside and outside, present in a weight ratio of 0.1wt% to 10wt% with respect to the weight of the entire fiber composition, dispersant, emulsifier, heat stabilizer, quencher and residue The functional fiber present between 0wt% and 10wt%, wherein the main material for forming the fiber is a homopolymer selected from the group consisting of ester, amide, acrylic, modacryl, vinyl alcohol, propylene, saccharide, protein, caprolactone, and these Of a multifilament having a thickness of 0.75 denier to 5 denier between 2 and 300 strands or a monofilament having a thickness of 0.1 mm to 1 mm and a thickness of 0.75 denier to 5 Between denier and in the form of staple fibers between 1 mm and 100 mm in length The functional fibers containing acid has been proposed. However, the above technique aims to semi-permanently maintain the functionality of chitosan without changing the physical properties of the fiber. It is difficult to secure uniformity, so there is a problem in radioactivity and the yarn is mixed, there is a disadvantage that the functional expression is insufficient.

In order to solve the above problems, an object of the present invention is to provide a polyolefin short fibers and antimicrobial functional endowment and a method of manufacturing 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 30-50 m / min at a spinning temperature of about 250 ° C .; Stretching the spun yarn at a draw ratio of 1.5 to 2.0 and a preheating temperature of 50 to 80 ° C; Crimping to impart crimp to the stretched filaments; A surface treatment step of fusing the crimped filament by spraying a liquid resin containing a functional spinning oil and chitosan; And it provides a method for producing a functional polyolefin-based short fibers comprising the short-fiber forming step of cutting the surface-treated filament heat cut after a predetermined length.

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

In another aspect, the present invention provides a method for producing a functional polyolefin-based short fibers containing 95 to 99% by weight of the polypropylene, 1 to 5% by weight of the liquid resin.

In another aspect, the present invention provides a method for producing a functional polyolefin-based short fibers containing chitosan contained in the liquid resin in 1 to 5% by weight in the liquid resin.

In another aspect, the present invention, in the polyolefin-based short fibers, a coating layer made of a liquid resin is further formed on the surface of the short fibers, the liquid resin provides a functional polyolefin-based short fibers containing chitosan.

In another aspect, the present invention is the polypropylene 95 to 99% by weight, the liquid resin is contained in the content of 1 to 5% by weight, the functional polyolefin-based short fibers containing 1 to 5% by weight of chitosan.

In addition, the present invention provides a functional polyolefin-based nonwoven fabric produced by a thermal bonding method, using the functional polyolefin-based short fibers produced by the above method.

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

In addition, the short fiber according to the present invention has the effect of almost no physical property degradation of the final product by minimizing the occurrence of physical property deterioration factors of the non-woven fabric such as air bubbles during the process of manufacturing the non-woven fabric by thermal bonding by applying the chitosan mixture.

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. In addition, due to the moisturizing effect it will be applicable to clothing for improving skin diseases such as atopy.

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

Hereinafter, preferred 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 resin containing chitosan and a functional spinning emulsion (surface treatment step), heat-set, and then 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 10 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 30 to 50 m / min at a spinning temperature of about 250 ℃, appropriately controlled at a draw ratio of 1.5 to 2.0, stretched to a preheating temperature of 50 ~ 80 ℃ after giving a crimp and Spray the hydrophilic spinning emulsion emulsion and chitosan-containing liquid resin 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 fiber is cut to have a length of about 65 mm, and the final fiber fineness is 6 to 10 deniers and the average elongation is set at 300 to 380%. Fibers can be produced.

On the other hand, the chitosan-containing liquid resin may be composed of 1 to 5% by weight, wherein the preferred amount of polyolefin is 95 to 99% by weight.

Chitosan is a β- (1 → 4) polymer of D-Glucosamine (2 amino-2-deoxyD glucose). Naturally, it is confirmed that it exists in the cell wall of conjugated fungi, but it is usually produced by treating chitin with concentrated alkali and N- deacetylation. Its main use is as a polymer flocculant, and it is used for the recovery of protein from waste water of food processing plant, the purification of drinking water, etc. It is used for anti-corruption of food, carrier for immobilization of enzymes and microorganisms as antibacterial and anti-microbial agent. Chitosan is insoluble in water but forms salts with organic or inorganic acids, most of which are water soluble. The water-soluble chitosan which formed the salt is used as a flocculant from the property which peels and binds an acid when it encounters organic materials, such as metals and proteins. In addition, chitosan forms a water-soluble polymer electrolyte composite by ionic bonds with polyanions.

Meanwhile, chitosan in the liquid resin may include 1 to 5% by weight. If the chitosan is included in 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.

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 chitosan.

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 calendar 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 properties of the nonwoven fabric. At this time, chitosan may act as a foreign material. Therefore, proper content ratio of chitosan 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 10 to 35 g / 10 min and II of 90 or more was prepared at a spinning temperature of about 250 ° C. and a spinning speed undrawn yarn of about 40 m / min, and the undrawn yarn was drawn at a draw ratio of about 1.5 to 2.0. Appropriately adjusted and preheated at about 80 ° C., the crimp was imparted to the crimper, and the liquid resin containing the hydrophilic spinning emulsion emulsion and chitosan was applied by spraying. At this time, the content of the spinning emulsion was 1% by weight based on the total weight of short fibers, and the chitosan in the liquid resin was 100ppm. After heat setting at about 110 ° C. for about 8 to 12 minutes, the fiber was cut to 65 mm in length to prepare a final polyolefin short fiber having 8 deniers 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

As in Example 1, but the liquid resin is 2% by weight, chitosan was set to 200ppm.

Comparative Example 1

Operation was carried out in the same manner as in Example 1, but the liquid resin was not treated.

* Testimonials

The nonwoven fabrics prepared in Example 1 and Comparative Example 1 were made into the inside, and the materials were secreted every day and tested for 25 people between 20 and 40 years of age when worn. Two target groups were worn to cross Example 1 and Comparative Example 1, respectively.

division Effective Little effect no effect Example 1 60 30 10 Comparative Example 1 20 10 70

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims

In the method for producing a polyolefin short fiber,
Melting a polyolefin-based resin;
Spinning the melt at a rate of about 30-50 m / min at a spinning temperature of about 250 ° C .;
Stretching the spun yarn at a draw ratio of 1.5 to 2.0 and a preheating temperature of 50 to 80 ° C;
Crimping to impart crimp to the stretched filaments;
A surface treatment step of fusing the crimped filament by spraying a liquid resin containing a functional spinning oil and chitosan; And
Method of producing a functional polyolefin-based short fibers comprising the step of forming a short fiber to heat the surface-treated filaments and cut by a predetermined length after heat setting.

The method of claim 1,
The liquid resin is a method of producing a functional polyolefin-based short fibers further comprises one or more selected from the group consisting of colorants such as antioxidants, UV stabilizers, process stabilizers and white pigments with chitosan.

The method of claim 1,
The polypropylene is 95 to 99% by weight, the method of producing a functional polyolefin-based short fibers containing the liquid resin in the content of 1 to 5% by weight.

The method of claim 53,
Chitosan contained in the liquid resin is a method for producing a functional polyolefin-based short fibers contained in 1 to 5% by weight in the liquid resin.

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 a functional polyolefin-based short fibers containing chitosan.

The method of claim 5,
The polypropylene is 95 to 99% by weight, the liquid resin is contained in the content of 1 to 5% by weight, the functional polyolefin-based short fibers containing 1 to 5% by weight of chitosan in the liquid resin.

The functional polyolefin nonwoven fabric manufactured by the thermal bonding method using the functional polyolefin short fiber manufactured by the method of any one of Claims 1-4, or the short fiber of any one of Claims 5-6. .