KR20050046864A - Elasticity and ventilation and watertight property nonwoven composition object - Google Patents

Abstract

The present invention is to provide a non-woven composite for use in the body wear products, including disposable diapers, disposable work clothes, clothing, disposable patches, manufactured by bonding an elastic film and an elastic non-woven fabric incorporating elasticity, breathability and waterproofing Providing a nonwoven composite incorporating elasticity, breathability, and waterproofing properties; The elastic film provides a nonwoven composite prepared by stretching an polyolefin-based polymer and an elastic polymer film containing an inorganic material; The stretchable nonwoven fabric provides uniaxially stretchable nonwoven fabrics with longitudinal axis stretching of various types of raw nonwoven fabrics, or the nonwoven fabric composite containing biaxial extensibility by stretching the contracted width of uniaxially stretchable nonwoven fabrics with a controlled width. ; Providing a nonwoven composite that partially bonds the elastic film and the nonwoven to stripes; Bonding the uniaxially stretched nonwoven fabric and the elastic film stretched at a greater elongation rate, and the composite is heated to shrink to provide a nonwoven composite imparting biaxial elasticity to the composite.

Description

Nonwoven Composite with Elasticity, Breathability and Water Resistance {ELASTICITY AND VENTILATION AND WATERTIGHT PROPERTY NONWOVEN COMPOSITION OBJECT}

The present invention relates to a nonwoven composite having elasticity, breathability, and waterproofness.

Nonwoven fabrics have many applications, such as low cost, light weight, good thermal insulation, free coloring, and easy mass production, but do not show stretchability, elasticity and waterproofness as long-fiber free-bonded woven fabrics. This characteristic is pointed out as the most important obstacle to use as a product worn and worn on the body, such as clothing or therapeutic horse cloth. Specifically, even in disposable baby diapers and adult diapers, there is a need for a nonwoven fabric having waterproof and elastic properties. In order to impart waterproofness to the nonwoven fabric, a waterproof nonwoven fabric having a polymer film adhered to the nonwoven fabric is manufactured, and a breathable film showing water barrier property and air flowability is adhered to a polymer film laminated to the nonwoven fabric to impart breathability to the waterproof nonwoven fabric. In order to impart breathability and water barrier property to the polymer film, an inorganic material-containing polymer polymer is prepared, and the inorganic material-containing polymer polymer is melted in an extruder to form a film, and then the film is stretched to provide air permeability and water barrier voids between the inorganic particles and the polymer. To make up. In addition, in order to impart extensibility to the nonwoven fabric, the nonwoven fabric is necked, clamped, sheared, and uniaxially stretched to embed the extensibility into the nonwoven fabric.

Techniques for improving the properties of such nonwovens are described in Korean Patent Application No. 10-2001-0024230 Non-woven Laminated Perforated Film and its manufacturing method; Korean Patent Application No. 10-2001-0024232 Lamination laminated body of non-woven fabric and low-capacity film and its preparation method; Republic of Korea Patent Application 10-2002-0021819 Rolled breathable film laminated with a non-woven fabric and a method and apparatus for manufacturing the same; Republic of Korea Patent Application 10-2003-0031514 Elastic nonwoven composite preserved breathability; Korea Patent Application 10-2002-0037846 Perforated nonwoven fabric laminated with waterproof film; Republic of Korea Patent Application 10-2002-0048345 Increasing non-woven cloth for skin adhesion; Republic of Korea Patent Application No. 10-2002-0071201 stretch nonwoven fabric; It is proposed in the Republic of Korea Patent Publication No. 1990-7001510.

However, the universal use of nonwovens for apparel or body wear products should give the nonwovens more aggressive textile properties. The nonwoven fabric for clothes is characterized by elasticity, breathability, waterproofness. For example, if a nonwoven fabric provided with elasticity, breathability, waterproofness, and water barrier property is used as a waterproof film of a patch product, it is stretched according to the movement of muscle when the sitting and standing motions are worn in a worn state, and the wearing comfort is very good. In order to implement such a body adaptation, development of nonwoven fabrics incorporating elasticity, waterproofness, and breathability is being developed in various countries.

The present invention is to provide a non-woven composite for use in the body wear products, including disposable diapers, disposable work clothes, clothing, disposable patches, manufactured by bonding an elastic film and an elastic non-woven fabric incorporating elasticity, breathability and waterproofing It is to provide a non-woven composite that is elastic, breathable and waterproof. The present invention is to provide a nonwoven composite for producing an elastic film from an elastic polymer comprising an inorganic material and a polyolefin-based polymer. The present invention is a uniaxially stretchable nonwoven fabric having a longitudinal axis stretch of various types of raw nonwoven fabrics, the transverse width is contracted, or a nonwoven fabric having a biaxial extensibility inherent by stretching the contracted width of the uniaxial stretchable nonwoven fabric to a control width. It is intended to provide a nonwoven composite by nonwoven fabric that has been given extensibility by necking, clamping, or shearing. The present invention is to provide a nonwoven fabric composite by partially bonding the elastic film and the nonwoven fabric in stripes. The present invention is to provide a composite in which a uniaxially stretched nonwoven fabric and an elastic film stretched at a greater elongation rate are bonded to each other, and the composite is heated and shrunk to impart biaxial elasticity to the composite.

The nonwoven fabric composite incorporating elasticity, breathability, and waterproofness includes an elastic film (II) incorporating elasticity, breathability, and waterproofness; Nonwoven fabric (V) having inherent extensibility; It was manufactured by laminating by an adhesive means. Hereinafter, the present invention will be described in detail.

1. Preparation of elastic film (Ⅱ) incorporating elasticity, breathability and waterproofness

Techniques for producing breathable films are disclosed techniques; A polyolefin polymer obtained by polymerizing one or more olefin monomers including ethylene, propylene, butadiene, octene, hexene, butene, and alpha olefins; Inorganic materials including calcium carbonate, barium sulfate, silica and talc are mixed and melted in an extruder, formed into a film on a die, cooled, and uniaxially oriented, locally oriented by embossing, or uniaxially oriented and embossed. Doing. The film prepared as described above is provided with fine pores formed between the polymer and the inorganic material during the stretching process to impart moisture and air, but is provided with breathability and waterproofness to block the permeation of water.

The elastic film (II) incorporating elasticity, breathability, and waterproofness of the present invention is manufactured by imparting elasticity, breathability, and waterproofness to a polymer film by using a part or all of a polyolefin-based polymer as an elastic polymer in the process of manufacturing the breathable film. .

Referring again to the manufacturing method of the elastic film (II) inherent in the elasticity, breathability and waterproofness of the present invention; 0 to 95 parts by weight of a polyolefin-based inelastic elastomer obtained by polymerizing at least one olefin monomer including ethylene, propylene, butadiene, octene, hexene, butene and alpha olefin; 5 to 100 parts by weight of the elastic polymer; Mixing 25 to 70 parts by weight of an inorganic material including calcium carbonate, barium sulfate, silica, and talc; Melted in an extruder, formed into a film in a die and cooled; Stretching is performed by any one of uniaxial stretching, local stretching by embossing, and parallel processing of uniaxial stretching and embossing to impart elasticity, breathability, and water resistance to the film.

In the present invention, the elastic polymer, polyolefin elastomer prepared by polymerizing at least one olefin monomer such as ethylene, propylene, butadiene, hexene, octene, alpha olefin, monomers having a polar group and the olefin monomers Copolymerized elastomers, styrene and elastomers in which the olefinic monomers are copolymerized. In addition, in the present invention, an elastic polymer is also used in the nylon elastomer polyether elastomer, the polyurethane-based elastomer, and the like. The present invention uses the one or more elastomers to produce an elastic film.

When the molded and cooled film is uniaxially stretched in the longitudinal axis (machine axis) in the manufacturing process of the elastic film (II) inherent in elasticity, breathability, and waterproofness, elasticity is inherent in the horizontal axis (contraction direction) of the film, and the longitudinal axis stretching direction ( Elasticity is exhausted). One method of imparting biaxial elasticity to the elastic, breathable and waterproof film is to locally stretch the film in the stretching process. The local drawing method is an embossing drawing method. When the film is locally stretched, longitudinal film elasticity is inherent in the film along with transverse elasticity.

2. Stretchable nonwoven

The nonwoven fabric laminated on the elastic film (II) having the elasticity, breathability, and waterproofness is an extensible nonwoven fabric.

The raw nonwoven fabric (III) is a long-fiber free tissue nonwoven fabric, which lacks extensibility, elasticity and waterproofness and should be given extensibility. To impart extensibility to the raw nonwoven fabric (III), extensibility is imparted by necking, crapping, shearing or uniaxially stretching the nonwoven fabric (III).

Nonwoven fabrics that can be used in the present invention include polypropylene thermal bond nonwovens, polypropylene spunbond nonwovens, polypropylene melt blown nonwovens, bicomponent nonwoven fabrics of polypropylene and polyethylene, polypropylene melt blown nonwovens and polypropylene spuns Bond nonwoven fabric, polyethylene nonwoven fabric, nylon nonwoven fabric with two or more layers of bond, bicomponent yarn mixed with polypropylene and polyethylene, polypropylene yarn, polyethylene yarn, viscose yarn, polyester yarn and nylon yarn There is a nonwoven fabric having a capacity of 5 to 180 g / m 2 selected from a nonwoven fabric, an airlaid nonwoven fabric, an air through nonwoven fabric, a spunlace nonwoven fabric, and a cotton yarn nonwoven fabric produced by mixing the above.

1 is a change state diagram of a nonwoven fabric in which soft properties are enhanced by providing biaxial extensibility. Longitudinally stretching the raw nonwoven fabric III of the width given in FIG. 1 (eg, 2000 mm); Preparing a uniaxial stretchable nonwoven fabric (IV) having a shrinkage in the transverse width; The contracted width (eg, 1000 mm) of the uniaxial stretchable nonwoven fabric (IV) is stretched to an adjustable width (eg, 1500 mm) to produce a nonwoven fabric (V) having enhanced soft properties. The nonwoven fabric treated as described above is laminated to the elastic film (II) having elasticity, breathability, and waterproofness to produce a nonwoven fabric composite having enhanced softness and embedding elasticity, breathability, and waterproofness. The nonwoven fabric of the present invention is characterized in that the nonwoven fabric provided with extensibility by necking, cramping, shearing, and uniaxial stretching has a low processing cost, but the texture becomes stiff. The point is to provide a high quality texture.

3. Lamination

The elastic film (II) and the stretchable nonwoven fabric (V), which have elasticity, breathability, and waterproofness, are laminated by applying heat from an embossing roll or by using an adhesive means (Ⅶ). When the entire surface of the elastic film (II) and the stretchable nonwoven fabric (V) are bonded in the lamination process, the breathability of the composite is lost. If the elastic film (Ⅱ) and the stretchable nonwoven fabric (V) are laminated while preserving breathability, the adhesive area of the two materials should be considered to be part of the nonwoven fabric area, and the adhesive part should be considered so as not to interfere with the elastic action of the material. As the adhesive, a liquid adhesive and a hot melt adhesive are preferable.

4. Breathable film incorporating biaxial elasticity

Another method of incorporating biaxial elasticity into elastic film (II) having elasticity, breathability, and waterproofness is to longitudinally stretch the elastic film by laminating the longitudinally stretched elastic film with a non-woven fabric having transverse stretchability and thereafter heating the laminated body. To shrink a certain amount. Uniaxially stretched films show shrinkage to return to their original state when subjected to heat. As an example, when the 100% uniaxially stretched breathable film is placed in 80 ° C. water for 1 minute, stretching direction of 5 to 35% is achieved. The stretching direction is generally the longitudinal axis (machine direction). 2 is an exemplary view of laminating an extensible nonwoven fabric (V) and an elastic film (II).

2, the elastic film (II) and the stretchable nonwoven fabric (V) are laminated together in a horizontal lateral stripe shape; When heat is applied to the laminate, the elastic film is contracted in the longitudinal axis direction as shown in FIG. 3 to have elasticity in the longitudinal axis direction.

According to the process of Figures 2 and 3, the longitudinally stretched elastic film and the stretchable nonwoven fabric are bonded with the transverse stripes, and heat is applied to the laminate of the elastic film and the stretchable nonwoven fabric to shrink the longitudinal film of the elastic film. By inducing, the result of incorporating the longitudinal axis elasticity of the elastic film is obtained.

In addition, the process of Figures 2 and 3 and the uniaxially stretched nonwoven fabric; An elastic film stretched at an elongation greater than this; Bonding to prepare a nonwoven composite; This complex is heated to shrink; This results in imparting biaxial elasticity to the composite.

Example 1

① Breathable film: 48 parts by weight of calcium carbonate, 15 parts by weight of ethylene-propylene copolymerized elastomer, styrene-containing elastomer (Crayton product name: Creton D2122) 11.5 parts by weight, polyethylene 20 parts by weight, ethylene and 5 parts by weight of an ethylene-vinylacetate copolymer (28% vinyl acetate content), a dispersant and an additive were 0.5 parts by weight of the monomer having a polar group polymerized, and then cooled after film molding in an extruder die and stretched 2.5 times in the longitudinal axis.

② Extensible nonwoven fabric: A polypropylene spunbond nonwoven fabric having a width of 18 g / m 2 was longitudinally stretched to reduce the width of the abscissa to 1.5 m, and then the width was again increased to 2.3 m to produce a stretchable nonwoven fabric.

③ The breathable film ① and the stretchable nonwoven fabric ② were bonded with a polyurethane adhesive as an adhesive means as in the example of FIG. 2 to prepare an elastic, breathable, waterproof nonwoven composite.

Example 2

The laminated body of Example 1 was put into 50 degreeC oven for 6 hours.

Experiment result

The moisture permeability and waterproofness of the composites prepared in Example 1 and Example 2 are shown in Table 1. Moisture permeability was measured to check breathability.

Table 1

Breathability (ASTM-E96) Water pressure (mbar) Example 1 1950g / ㎡.day 73 Example 2 1630g / ㎡.day 75

When the nonwoven composite of Example 1 was held with both hands and pulled in the direction in which the elasticity was inherent, similar elastic elasticity to the fibrous fabric was found, unlike the raw nonwoven fabric. The amount of stretching was forcibly stretched to 10 cm in length and non-woven composite was restored to 10.2 cm in length.

Biaxial elasticity was confirmed in the nonwoven composite of Example 2.

As described above, the present invention is to provide a nonwoven composite for use in a body wear product, including disposable diapers, disposable coveralls, clothing, disposable patches, elastic films and stretchable nonwoven fabrics incorporating elasticity, breathability and water resistance Providing a nonwoven composite incorporating elasticity, breathability, and water resistance produced by bonding; The elastic film provides a nonwoven composite prepared by stretching an polyolefin-based polymer and an elastic polymer film containing an inorganic material; The stretchable nonwoven fabric provides uniaxially stretchable nonwoven fabrics with longitudinal axis stretching of various types of raw nonwoven fabrics, or the nonwoven fabric composite containing biaxial extensibility by stretching the contracted width of uniaxially stretchable nonwoven fabrics with a controlled width. ; Providing a nonwoven composite that partially bonds the elastic film and the nonwoven to stripes; Bonding a uniaxially stretched nonwoven fabric with an elastic film stretched at a greater elongation rate, and heating the composite to shrink to give a non-woven composite composite is imparted biaxial elasticity and enhanced soft properties.

1 is a conceptual view of processing to give biaxial stretch to a nonwoven fabric

2 is an elastic film incorporating elasticity, breathability and waterproofness; Example of the cross-sectional view of the bonded state of the nonwoven fabric having inherent stretch

3 is a cross-sectional view of a nonwoven composite having biaxial elasticity

Explanation of Major Symbols

II is an elastic film; III is a raw nonwoven fabric; IV is a uniaxial stretchable nonwoven fabric; Squeezing means; V is an extensible nonwoven fabric;

Claims (8)

An elastic film having elasticity, breathability, and waterproofness; Nonwoven fabrics with inherent stretchability; As an adhesive; Non-woven composite with elasticity, breathability and waterproofness built by bonding. [Claim 2] The polyolefin-based inelastic polymer according to claim 1, wherein the elastic film having elasticity, breathability, and waterproofness is polymerized by polymerizing at least one olefin monomer including ethylene, propylene, butadiene, octene, hexene, butene, and alpha olefin. Parts by weight; 5 to 100 parts by weight of the elastic polymer; 5 to 70 parts by weight of an inorganic material including calcium carbonate, barium sulfate, silica, and talc; Melting in an extruder, forming a film in a die and cooling; Non-woven composite with elasticity, breathability and waterproofness produced by stretching. 3. The elasticity, breathability, and waterproofness of claim 2, wherein the molded film is stretched by any one of uniaxial stretching, local stretching by embossing, and parallel processing of uniaxial stretching and embossing to impart elasticity, breathability, and waterproofness to the film. Nonwoven composite. The method of claim 2, wherein the elastomeric polymer is a polyolefin elastomer prepared by polymerizing one or more olefin monomers such as ethylene, propylene, butadiene, and alpha olefins, and copolymerized monomers having polar groups with the olefin monomers. A nonwoven composite having elasticity, breathability, and water resistance, which is at least one of a elastomer, a styrene-based copolymer copolymerized with the olefin monomers, a nylon elastomer, a polyether elastomer, and a polyurethane-based elastomer. The nonwoven fabric of claim 1 wherein the extensible nonwoven fabric is a polypropylene thermal bond nonwoven fabric, a polypropylene spunbond nonwoven fabric, a polypropylene melt blown nonwoven fabric, a bicomponent nonwoven fabric of polypropylene and polyethylene, a polypropylene melt blown nonwoven fabric and a polypropylene spun Bond nonwoven fabric, nonwoven fabric of polyethylene, nonwoven fabric of nylon, nonwoven fabric of polyester, nonwoven fabric of polyester, nonwoven of polypropylene and polyethylene, polypropylene yarn, polyethylene yarn, viscose yarn, polyester yarn and nylon yarn 1 A nonwoven composite with elasticity, breathability and water resistance, which is a nonwoven fabric having a capacity of 5 to 180 g / m2 selected from nonwoven fabric, airlaid nonwoven fabric, air through nonwoven fabric, spunlace nonwoven fabric, and cotton yarn nonwoven fabric. The nonwoven fabric of claim 1, wherein the stretchable nonwoven fabric is longitudinally stretched from the raw nonwoven fabric; Preparing a uniaxial stretchable nonwoven fabric having a shrinkage in the transverse width; A nonwoven composite with elasticity, breathability, and waterproofness that extends the contracted width of a uniaxial stretchable nonwoven fabric to a control width to give biaxial extensibility and promote soft properties. The method of claim 1, further comprising: partially bonding the longitudinally stretched elastic film and the stretchable nonwoven fabric with transverse stripes; Produced by applying heat to the laminate of the elastic film and the stretchable nonwoven fabric to induce longitudinal contraction of the elastic film to embed the longitudinal elasticity of the elastic film; Non-woven composite with elasticity, breathability and waterproofness. Uniaxially stretched nonwoven fabrics; An elastic film stretched at an elongation greater than this; As an adhesive; Bonding to prepare a nonwoven composite; This complex is heated to shrink; Non-woven composite with elasticity, breathability and waterproofness that impart biaxial elasticity to the composite.