KR101252342B1 - Non-woven fabric having an improved property for touch and environment-friendly and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a composite long fiber nonwoven fabric having excellent touch and environmental friendliness, and a method for producing the composite long fiber nonwoven fabric having excellent touch and environment-friendly biodegradable PLA polymers are located therein. Polyethylene polymer is a spunbond nonwoven fabric using long fibers composed of composite fibers to be located outside, the long fibers composed of the composite fibers to melt the PLA in the extruder of PLA, polyethylene resin is another The furnace is melted and fed through a spin pump that feeds each polymer melt into the radiation beam and the melt flow path is spun into a nozzle through a determined distribution plate, with PLA positioned inside the composite cross section and polyethylene Located outside and spinning, solidifying, stretching, crystallized by stretching The fibers are integrated in a web form on a spin belt, and then heat bonded and manufactured by combining in various ways.
The composite long fiber nonwoven fabric having excellent tactile feel and environmental friendliness of the present invention configured as described above and a method for manufacturing the same are made of an environmentally friendly polylactic acid composite long fiber nonwoven fabric using polylactic acid resin (PLA) and polyolefin resin (PE), PLA, made of natural materials, and PE, which can give flexibility, can produce eco-friendly, high strength, and very soft non-woven fabrics. The change of time and the touch were hard, which could solve the problems that can be produced only in the process equipped with the drying equipment for limiting development of various uses and containing a certain moisture content.

Description

Non-woven fabric having an improved property for touch and environment-friendly and manufacturing method

The present invention relates to a composite long-fiber nonwoven fabric having excellent touch and environmental friendliness, and a method for manufacturing the same, and more particularly, to include biodegradable polylactic acid polymer and polyethylene appropriately so as to maintain biodegradation properties and to have excellent radioactivity and other nonwoven fabric characteristics. The present invention relates to a composite long fiber nonwoven fabric having excellent tactile feel and being environmentally friendly, and a method for producing the same.

Efforts to reduce carbon dioxide due to global warming are continuously being studied. In particular, polymers produced from fossil raw materials have high carbon dioxide emissions and limited reserves, and thus polymers synthesized from natural plants have been continuously studied. Recently, polylactic acid products that can be fiberized through melt spinning have been developed, and research on products has been conducted. Existing eco-friendly materials have been in progress in product development, with emphasis on microbial degradability, but there are many problems in practical use because they are not suitable for the price and required characteristics of the product. In particular, fibers or non-woven fabrics made of 100% polylactic acid (hereinafter referred to as PLA) require hydrophobicity and low water absorption, so that hydrolysis progresses in a high temperature and high humidity environment, and thus dimensional stability and strength are significantly reduced. If there is a limit to use as an industrial material, there is also a problem that it is not suitable for hygiene because the touch is not hard and soft.

For example, Japanese Patent Laid-Open No. Hei 7-48769 (1995) and Japanese Patent Laid-Open No. Hei 6-264343 (1994) disclose a process from production of polylactic short fiber nonwoven fabric to nonwoven fabric. Many processes from fiber formation to nonwoven fabric have a disadvantage in that there is a limit in reducing manufacturing costs. In addition, although a method for manufacturing a long fiber spunbond nonwoven fabric using PLA is described in Japanese Patent Application Laid-Open No. H6-264343, no detailed manufacturing conditions related to fiber spinning are mentioned, and there is no description of the physical properties of the resulting product. There is a disadvantage in that a PLA-based nonwoven fabric having desired characteristics cannot be obtained.

Japanese Laid-Open Patent Publication 7-48769 Japanese Laid-Open Patent Publication 6-264343 Japanese Laid-Open Patent Publication 6-264343

Accordingly, the present invention has been made in view of the above-described conventional circumstances, and the first object of the present invention is to provide a composite long fiber nonwoven fabric having a soft touch and excellent mechanical strength for practical use.

Another object of the present invention is to provide a process for producing a composite long fiber spunbond nonwoven fabric having the above characteristics with excellent workability to provide a manufacturing method that can be easily manufactured at low cost without difficulty in the manufacturing process will be.

The present invention may also be aimed at achieving, in addition to the above-mentioned specific objects, other objects which can be easily derived by those skilled in the art from this and the overall description of the present specification.

The above object of the present invention has been achieved by providing a process for producing a composite long fiber nonwoven fabric using polylactic acid and polyethylene having certain characteristics consistently.

The manufacturing method of the composite long-fiber nonwoven fabric having excellent touch and environmental friendliness of the present invention for achieving the above object;

Biodegradable PLA polymer is a spunbond nonwoven fabric using long fibers composed of composite fibers to be located inside, polyethylene polymer is located outside,

The long fiber composed of the composite fiber melts the PLA in the extruder of the PLA, the polyethylene resin is melted in the other extender, and is supplied through a spin pump for supplying each polymer melt to the radiation beam. Is spun into a nozzle through the determined distribution plate, where PLA is located inside the composite cross section and polyethylene is located outside and spun; It is characterized in that the integrated in the form of a web on a spin belt (Spin belt), and then bonded by heat bonding and various methods.

According to another configuration of the present invention, the PLA composition ratio is characterized by consisting of 20 to 80%.

According to another configuration of the present invention, the PLA composition ratio is characterized in that consisting of 30 to 70%.

According to another configuration of the present invention, the PLA is a polylactic acid polymer, characterized in that selected from the group consisting of poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid.

According to another configuration of the present invention, the PLA polymer is characterized in that the melting point is 100 ℃ or more, the melt index is 15 to 30g / 10 minutes, the melt density is 0.98 to 1.24g / cm 3 (230 ℃) It is done.

According to another configuration of the present invention, the PLA polymer is characterized in that it has a shrinkage of 8% or less in a hot air of 10 minutes at 130 ℃.

To achieve another object of the present invention, the composite long-fiber nonwoven fabric having excellent touch and environmental friendliness;

Biodegradable PLA polymer is a spunbond nonwoven fabric using long fibers composed of composite fibers to be located inside, polyethylene polymer is located outside,

The long fiber composed of the composite fiber melts the PLA in the extruder of the PLA, the polyethylene resin is melted in the other extender, and is supplied through a spin pump for supplying each polymer melt to the radiation beam. Is spun into a nozzle through the determined distribution plate, where PLA is located inside the composite cross section and polyethylene is located outside and spun, the fibers polymerized are solidified, drawn, and crystallized by drawing. It is manufactured by integrating in a web form on a spin belt, and then thermally bonded and bonded in various ways,

The spunbond nonwoven fabric has a basis weight of 10 to 70 g / m 2.

The composite long fiber nonwoven fabric having excellent tactile feel and environmental friendliness of the present invention configured as described above and a method for manufacturing the same are made of an environmentally friendly polylactic acid composite long fiber nonwoven fabric using polylactic acid resin (PLA) and polyolefin resin (PE), PLA, made of natural materials, and PE, which can give flexibility, can produce eco-friendly, high strength, and very soft non-woven fabrics. The change of time and the touch were hard, which could solve the problems that can be produced only in the process equipped with the drying equipment for limiting development of various uses and containing a certain moisture content. In addition, through the present invention, it is possible to manufacture a composite long fiber nonwoven fabric of polylactic acid and polyolefin having a soft touch to solve the difficulties of the conventional production process and can be applied to various fields.

1 is a cross-sectional view of a nonwoven fabric prepared according to the present invention, Figure 1a is made of a ratio of PLA 30% and polyethylene 70%, Figure 1b is made of a ratio of 50% PLA and 50% polyethylene, Figure 1c is made of a ratio of 70% PLA and 30% polyethylene.

EMBODIMENT OF THE INVENTION Hereinafter, although an accompanying drawing is demonstrated in detail according to preferred embodiment, it is a matter of course that the scope of the present invention is not limited to this.

Figure 1 shows a cross section of each of the non-woven fabric produced in a specific ratio of PLA and polyethylene in accordance with the present invention.

According to a preferred embodiment of the present invention, the nonwoven fabric according to the present invention is made of a spunbond nonwoven fabric using long fibers composed of composite fibers located inside the biodegradable PLA polymer and located outside.

In an embodiment of the present invention, the PLA polymer has a melting point of at least 100 ° C., preferably at least 140 ° C., a melt index of 15 to 30 g / 10 minutes, and a melt density of 0.98 to 1.24 g / cm 3 (230 ° C.). Use a range of properties. It should also have a shrinkage of 8% or less on hot air for 10 minutes at 130 ° C.

In addition, in embodiment of this invention, melting | fusing point of the polyethylene which forms the exterior of a composite cross section is 100 degreeC or more, Preferably it is 120 degreeC or more. In addition, the melt index is used having a characteristic of 20 to 35g / 10 minutes.

According to the present invention, the setting of the melting temperature in the extruder of PLA to produce the composite cross-section long fiber nonwoven fabric containing PLA causes the PLA to melt at a temperature of Tm + 80 to + 120 ° C. (where “Tm "Is the melting point of the polymer). The polyethylene resin constituting the sheath of the composite section is melted in the range of Tm + 60 to + 100 ° C. in another extender. Each polymer is supplied through a spin pump that supplies the melt to the radiation beam and is emitted to a nozzle through a distribution plate in which the melt flow path is determined. At this time, PLA is located inside the composite cross section as shown in Figure 1 to form strength and biodegradable properties, polyethylene is located outside to form a soft property. Cooling air (12-25 ° C) is applied on both sides of the spinning to solidify the spinning polymer, and the speed of the fiber is lowered at a speed of 2500-6000m / min through the air suction unit to draw and stretch the fibers. Stretching is achieved. Fibers composed of a composite cross section of PLA and polyethylene are solidified by cold air and crystallized by downward stretching of air and then integrated into a web on a spin belt that is moved. PLA composite aggregates are bonded by heat bonding and various methods to form nonwoven fabrics.

According to a preferred embodiment of the present invention, PLA according to the present invention as described above is a polylactic acid-based polymer from the group consisting of poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid You can choose.

As described above, the PLA of the present invention has a melting point of 120 ° C. or more, more preferably 160 ° C. This is because it is important for long-term use and heat resistance to heat.

In a preferred embodiment of the invention, the polyethylene and the constituent ratios are in the category according to the invention so as to maintain good radioactivity even without using PLA in the specific drying process. Typically, PLA requires drying because it absorbs moisture. Specifically, PLA prepared in general contains 400 ppm of water and a moisture content of 50 ppm or less is required for easy spinning. Therefore, it is common to require drying in order to satisfy the above conditions. However, since the long fiber spunbond facility based on a general polyolefin resin does not have a drying facility, there is a problem that a new drying facility has to be introduced to produce PLA. However, in the present invention, it is possible to produce without specific drying equipment even in the 400ppm moisture state of 50ppm or more, it is possible to produce good radioactivity and products. In detail, the composition ratio of PLA and polyethylene is very important in constructing the composite section of PLA and polyethylene. When the amount of PLA is excessively large, there is a problem in that the radioactivity and feel by moisture content are not excellent, and when the ratio of polyethylene is relatively high, the feel is excellent but the strength and physical properties are significantly reduced. Therefore, in the present invention, the PLA composition ratio is 20 to 80%, preferably 30 to 70%.

The fiber composed of the cross section by spinning is cooled by air and drawn by the pressure difference between the upper and lower parts of the spinning section. The fibrillated long fibers are integrated on the spin belt by air suction of the lower part of the spin belt being moved. The amount of accumulation is determined by the speed of the spin belt and the amount of polymer radiated.

The web formed of the fiber of the composite structure is sheeted by a thermocompression roll applied with temperature and heat. The bonding method is not limited to thermal bonding, but non-woven sheets may be manufactured by bonding in a manner such as spunlace bonding with high pressure water, ultrasonic bonding bonding with ultrasonic waves, and needle punching bonding with needle punching.

Hereinafter, the present invention will be described in more detail with reference to examples, but it goes without saying that the scope of the present invention is not limited to these examples.

In the following examples and comparative examples, physical property values were determined by:

(1) Melt Index, MI (g / 10min): Analyzed at 210 ° C according to ASTM-D-1238

(2) Weight (gsm): EDANA 40.3-90

(3) Tensile strength (kg / 5cm): EDANA 20.2-89

(4) Hardness (mm): Bending Length, WSP 90.5

Examples 1 to 3

PLA with a melting point of 160 ° C. and a MI of 35 and a polyethylene with a melting point of 140 ° C. and a MI of 30 g / 10 min were used. The temperature of the extruder for melting PLA was 250 ° C. and the polyethylene was melted at 225 ° C. The molten polymer was moved to the inside of the PLA by the distribution plate in the composite spinning spin beam, and the polyethylene was moved outward, and spun into a composite cross-sectional shape through a nozzle to produce a filament. At this time, the composition ratio and physical properties of the fiber composition PLA and polyethylene are as shown in Table 1. In addition, the PLA used in the examples was not particularly dried and applied as it is in a water content of about 400 ppm or more, which is a general water content. The thermal fusion temperature was set in the range of TM + 10-20 ° C. However, the thermal fusion temperature and pressure is changed by the speed of production is not particularly limited. The cross section of the fiber of each example thus prepared is shown in FIG. 1 and the physical properties thereof are shown in Table 1 below.

Comparative Examples 1 and 2

Except for changing the composition ratio of the composite fiber as shown in Table 1 in the practical manner in the same manner as in Example to prepare a nonwoven fabric. Physical properties of the prepared nonwoven fabric were measured and shown in Table 1 below.

Item ratio weight burglar Shinto Lecture Radioactive
Great
usually PE PLA MD CD MD CD MD sheath core gsm Kg / 5cm % mm Practice 1 30 70 40 6.5 3.2 55 60 58 Great Practice 2 50 50 18 1.5 0.7 66 62 32 Great Conduct3 70 30 40 4.3 1.7 108 108 46 Great Comparison 1 80 20 40 3.8 1.6 45 62 35 usually Comparison 2 85 15 40 3.5 1.5 46 65 34 usually

Claims (7)

A biodegradable polylactic acid (PLA) polymer is a spunbond nonwoven fabric using long fibers composed of composite fibers that are positioned inside and polyethylene polymer is located outside.
The long fiber composed of the composite fiber melts the polylactic acid polymer at a temperature of the melting point of the polymer at a temperature of 80 to + 120 ° C. in the extruder of the polylactic acid polymer, and the polyethylene polymer has a melting point of the polymer at 60 ° C. in another extender. It melts at a temperature of ~ +100 ℃, is supplied through a spin pump for supplying each polymer melt to the radiation beam, and the melt flow path is discharged to the nozzle (Nozzle) through the determined distribution, wherein the composition ratio of the polylactic acid is 30 to 70% by weight of the inside of the composite cross-section and polyethylene is located on the outside to spin, solidify the polymer to be stretched, stretched, the fiber crystallized by the stretching on the spin belt (web form) Haptic and environmentally friendly composite Jangsum, characterized in that it is produced by integrating into a film, and then bonding by heat bonding or needle punching. Method of producing a non-woven fabric.
delete delete The method of claim 1, wherein the polylactic acid (PLA) polymer is a polylactic acid polymer selected from the group consisting of poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid A method of producing a composite long fiber nonwoven fabric having excellent touch and environmental friendliness, characterized by
delete The method of claim 1, wherein the polylactic acid (PLA) polymer is characterized in that it has a shrinkage of 8% or less in a hot air of 10 minutes at 130 ℃ of the excellent long-acting and environmentally friendly composite long-fiber nonwoven fabric Manufacturing method.
delete

Images