KR100865438B1 - Nonwoven fabrics having permanent hydrophilicity and producing process thereof - Google Patents

Abstract

The present invention is not only to become a heavy weight product for sufficient sun protection, so that the spunbond nonwoven fabric can be sufficiently prevented in weed growth suppression in the production of multi-layered high-span spanbond nonwoven fabric for the purpose of weeding through agriculture, in particular weed growth inhibition. By supplying hydrophilic additive and UV stabilizer to certain ingredient extruder, melt and spinneret to form filament and use it, it is UV safe processing and has excellent UV safety. The present invention relates to a non-woven fabric having a permanent hydrophilicity and a method for producing the same, which expresses hydrophilicity, so that liquid fertilizer and rainwater can be permeably and permanently permeated to facilitate the growth of fruit trees or crops.

The non-woven fabric having a permanent hydrophilicity of the present invention configured as described above can permanently meet the wetness suitable for the environment in which the nonwoven product is applied, and especially for long-term exposure to the natural environment for long-term weed growth inhibition. Non-woven fabric and its manufacture that can be used for a long period of time because the hydrophilic properties of the non-woven fabric does not destroy the permanent and persistent hydrophilic properties compared to the conventional surface treatment of the aqueous surfactant by fluid contact. Provide a method.

Nonwoven, hydrophilic, permanent, stability.

Description

Nonwoven fabrics having permanent hydrophilicity and a method of manufacturing the same

The present invention relates to a non-woven fabric having a permanent hydrophilicity and a method for manufacturing the same, and more particularly, to prevent weed growth inhibition sufficiently in the production of multi-layered high-strand spanbonded nonwoven fabric for the purpose of weeding through agriculture, in particular through weed growth inhibition. This spanbonded nonwoven fabric is not only a heavy weight product for sufficient sun protection, but also UV-safe processing, which is excellent in UV safety, and permanently modifies the hydrophobic properties of the raw materials of nonwoven fabrics, resulting in permanent hydrophilicity. The present invention relates to a non-woven fabric having a permanent hydrophilic property having a function of permeating permanently good fruit and smoothing the growth of fruit trees or crops, and a method of manufacturing the same.

In general, as a conventional method of weeding and weeding, weeding is carried out by spraying herbicide to kill weeds or by hand weeding. However, if the herbicide is used, it is not preferable because it may cause contamination of the soil or kill the microorganisms beneficial to crop growth by surviving in the soil or soil.

Therefore, in order to solve such a conventional problem, a nonwoven fabric for suppressing growth by suppressing weed photosynthesis has been proposed and used conventionally. Such a nonwoven fabric has been proposed and used as a spunbond nonwoven fabric using polyolefin-based, in particular, polypropylene resin as a raw material. These polypropylene resins are hydrophobic in nature and when they cover the furrows of fruit trees for weeding with a nonwoven fabric made of polypropylene resin, the nonwoven fabric blocks not only sunlight but also permeate or rain water. There was a problem that causes trouble in the supply of smooth nutrients and moisture.

Therefore, there have been attempts of various functional processing to solve the above problems. For example, Korean Patent Application No. 97-00800784 discloses that "Three thousands of strands of about 3 ± 0.2 denier microfine synthetic yarns are rotated to a rather large radius. Embossing is performed on the nonwoven fabric 2 in a conventional nonwoven fabric having a thickness of about 0.5 mm and an interval of about 1 mm, while embossing on the nonwoven fabric by forming a nonwoven fabric by thermal compression. 6) discloses a nonwoven fabric for preventing soil acidification and weed growth, wherein the nonwoven fabric is formed at the same position on both sides of the front and back surfaces, and the thickness of the nonwoven fabric is maintained at about 0.8 to 1.5 mm. While blocking the insulating nonwoven fabric on the top of the soil to try to suppress the growth of weeds, as in the case of the present invention as a polyolefin crab fiber The nonwoven fabric does not contain UV stabilizer, so when exposed to sunlight, the intermolecular chains are destroyed by the ultraviolet rays of sunlight, preventing the growth of weeds. The disadvantage is that it is not desirable to grow fruit trees,

In addition, the applicant of the Patent Application Publication No. 2003-0005930, "Method of manufacturing a spunbond nonwoven fabric having excellent weatherability and hydrophilicity" is melt mixed by putting a polyolefin chip as a main raw material and a master batch chip containing UV stabilizer into the main raw material and an injection machine. After manufacturing the filament through the spinning, cooling and stretching process through a spinneret composed of a plurality of orifices, forming a web on the conveyor belt and heat-bonding to produce a nonwoven fabric and then applying a hydrophilic agent to the surface of the nonwoven fabric Although a method of manufacturing a spunbond nonwoven fabric is disclosed, the present invention proposes a hydrophilic treatment method in which a hydrophilic agent is applied only to the surface of a nonwoven fabric in order to improve permeability of liquid rain and rainwater. However, when the hydrophilic agent is treated according to the above method, since the hydrophilic agent applied on the nonwoven fabric does not have durability through chemical bonding with the fiber, the hydrophilic agent is easily eliminated during rain or liquid fertilization and thus does not have a durable function. In addition, when the weight of the nonwoven fabric is 30 g / m 2 (GSM) or more, it is difficult to achieve uniform penetration of the hydrophilic agent to the back side by the thickness of the fibers constituting the nonwoven fabric, and to reduce the production speed in order to achieve sufficient performance. There was a problem such as to.

As described above, agricultural nonwoven fabrics, which are generally made of polyolefin resins, are characterized by not being wetted by fluids such as water. Therefore, in the conventional method, it is most common to use aqueous surfactants by imparting wettability by coating the surface of the nonwoven fabric. However, the above-mentioned problems have been raised and the solution to this situation has been circumstance.

Accordingly, the present inventors have completed the present invention by intensively studying the nonwoven fabric and its manufacturing method which can solve the above-mentioned problems and impart more efficient and economically permanent hydrophilicity.

An object of the present invention is to provide a non-woven fabric having a permanent hydrophilic property that can be permanently wettable in agricultural nonwoven fabrics and also contains UV stabilizers properly and is not destroyed by sunlight to effectively use for weed growth inhibition for many years.

Another object of the present invention is to provide a method for more effectively producing a non-woven fabric having permanent hydrophilicity having the above characteristics.

An object of the present invention is to produce a hydrophobic polypropylene nonwoven fabric by mixing a hydrophilic agent and a UV stabilizer with the basic raw material by a suitable method and ratio to perform a composite spinning to uniformly contain a hydrophilic agent in the fabric produced nonwoven fabric It has been found that permanent hydrophilicity can be imparted to the present invention to complete the present invention.

Method for producing a permanent hydrophilic nonwoven fabric of the present invention for achieving the above object;

Melting plastic resin is melted and extruded into a plurality of orifices to form a filament, cooled by cooling air provided from a cooling chamber to solidify the filament, and made a small fiber diameter through the stretching process, and then filament is placed on an endless conveyor belt. In the method of manufacturing a nonwoven fabric having a morphological stability and mechanical properties by laminating a web to form a thermal bond (Point Bond) by thermal calender,

The molten plastic resin has a polyolefin resin as a first component, a hydrophilic additive as a second component, a UV stabilizer as a third component, and the resin of each component is supplied to an extruder to melt and spinneret to filament It characterized by using to form.

According to another configuration of the present invention, the composition of the first component is 85 to 96% by weight, the second component of the hydrophilic additive is 2 to 5% by weight, the third component of the UV stabilizer is in the range of 2 to 10% by weight It is characterized in that selected from.

If the two-component hydrophilic additive is less than 2% by weight, the wettability of the fluid is lowered, so that sufficient hydrophilicity intended by the present invention cannot be obtained, and thus, permeation of liquid or rainwater can be inhibited to inhibit the growth of fruit trees. On the contrary, only 5% by weight can obtain a fluid permeability sufficient for growing fruit trees, and further addition is meaningless.

In addition, the UV stabilizer, which is a third component added according to the present invention, is optimally capable of maintaining morphological stability without breaking the intermolecular chains even with ultraviolet rays sufficiently strong in the range of 2 to 10% by weight as defined in the present invention. Experimental results show that the third component added according to the intention of the present invention may be used outside the scope of the present invention, unless it is a matter of manufacturing process and other costs, which is also outside the scope of the present invention. Of course not.

According to another configuration of the present invention, the nonwoven fabric may be made of a spanbonded nonwoven fabric including one or more layers, and when one or more layers of meltblown layers are formed inside the one or more spanbonds, the nonwoven fabric having different characteristics is compounded. It may be a multi-layer SMS-based nonwoven fabric.

According to another configuration of the present invention, the nonwoven fabric is characterized in that 20 to 150g / ㎡. If the weight of the nonwoven fabric is 20 g / m 2 or less, the barrier against weeds and the sun against the sun is weak, which is not preferable, and if it exceeds 150 g / m 2, it is not preferable in terms of economics and fluid permeability.

Non-woven fabric having a permanent hydrophilicity for agriculture to achieve another object of the present invention;

It is characterized in that the non-woven fabric having a permanent hydrophilic nonwoven fabric produced according to the above-described manufacturing method for use in agriculture for inhibiting weed growth.

Hereinafter, the present invention will be described in more detail.

The multilayered weed growth inhibiting nonwoven fabric having a permanent hydrophilicity (hereinafter referred to as "multi mulching nonwoven fabric") according to the present invention described above is formed by a spanbond method. Spunbond nonwoven fabrication typically involves melting molten plastic resin and extruding it into a plurality of orifices to form filaments, cooling with cooling air imparted from a cooling chamber to solidify the filaments, and creating a small fiber diameter through the stretching process.

Conventional melt blown manufacturing methods are known in the art, in which a melt flow index (MI: Melt Index) of polypropylene resin is 800 to 1200 g / 10 min, and is melted and spun into a plurality of orifices arranged in a row. Blows with a strong frenzy in microfiber. Typically the fineness of the meltblown nonwoven has a fineness of 0.01 to 0.1 denier.

The filaments are laminated on an endless conveyor belt to form a web, which is formed of a nonwoven fabric having morphological stability and mechanical properties by thermal bonding with a point bond. At this time, it is possible to manufacture a spunbond nonwoven fabric including one or more layers, and if one or more meltblown layers are formed inside the one or more spanbonds, an SMS-based nonwoven fabric having a multi-layered structure in which a nonwoven fabric having different properties is combined can be manufactured. .

In the present invention, the polyolefin resin is the first component, the hydrophilic additive is the second component, and the UV stabilizer is the third component. The composition of the first component is 85 to 96% by weight, the second component of the hydrophilic additive is 2 to 5% by weight, the third component UV stabilizer is selected from the range of 2 to 10% by weight.

The first component is a polyolefin-based polypropylene resin with a melt index (MFR) of 25 to 60 g / 10 minutes, but the resin is not limited to having such a melt index. In addition, the hydrophilic additive that is the second component may include a surfactant that may be added to the polypropylene resin. The UV stabilizer as a third component may be added to the polypropylene resin. In the dosing for weighing the raw materials, the input ratio is determined according to the weight% and transferred to the extruder. The conveyed components are melted and kneaded in the extruder. The filaments forming the nonwoven are formed by the molten polymer being spun through a plurality of orifices, solidified and then stretched. At this time, the second hydrophilic component contained in the polymer is fiberized to form at least part of the surface in the fiber length direction. The fibers formed on the endless belt are thermocompressed with a thermal calender for morphological stability and mechanical properties. The thermocompression process is formed in two heated rollers in a conventional manner and at least the first roller is supplied with heat and consists of patterned embossing on at least one other roller. In order to multilayer the fibers composed, at least one filament forming unit in which the raw material supply, the melting part, and the spinning part are integrated must be provided. When formed from two spinnerets, a two-layered SS nonwoven fabric is provided and the three-layered spinneret provides an SSS nonwoven fabric. In addition, it provides an SMS-based non-woven fabric when the melt blown, which is a micronized fiber in the spanbond is compounded.

The multilayered nonwoven fabric having a permanent hydrophilicity according to the present invention is not limited to any one of the above forms, and in the present invention, by adjusting the content of the surfactant in the fibers constituted layer by layer, any combination of absorbency in the vertical direction of the nonwoven fabric is arbitrarily combined. can do. For example, in the case of the non-woven fabric provided in two layers, the moisture content is rapidly transmitted by increasing the surfactant content on the outside to improve the absorbency, and the moisture content is gradually transmitted by reducing the surfactant content of the fiber constituting the back side from the outside. It is designed to prevent the loss of soil through excessive water inflow.

The fineness of the fibers constituted is 2-6 denier and excellently 3-4 denia. If the denia is excessively large, the lamination of the fibers may be poor and weeds may break through. The weight of the nonwoven fabric produced in the present invention is 20 to 150 g / m 2. 40 to 80 g / m 2 is excellent and 50 to 70 g / m 2 is even better. When the weight is low, the weed blocking ability and light transmittance become large, and weed growth cannot be effectively suppressed. If the weight is excessively high, the light impermeability is excellent, but the economical and fluid permeability is not excellent.

The non-woven fabric having a permanent hydrophilicity of the present invention configured as described above includes a surfactant in a length direction in the fiber by using a surfactant as a predetermined component in a polypropylene resin, so that the nonwoven product has durability of wetness. Permanently satisfying the constantly demanded demand for wetting suitable for the environment in which it is applied, especially surface treatment of existing aqueous surfactants by prolonged fluid contact, even when exposed to natural environments for long periods of time, especially for long-term use in inhibiting weed growth. Since it has a property of permanently and continuously maintaining hydrophilicity, and also contains a certain UV stabilizer, it is possible to use for a long time as the molecular chain of the nonwoven fabric is not destroyed by sunlight.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the scope of the present invention is not limited thereto.

In addition, the measurement and evaluation value of the various characteristic in each following Example and the comparative example were analyzed by the method shown next.

1) Weight per unit area (weight: g / m 2): Measured according to the method of ASTM D 3776-1985.

2) Tensile strength: Using Instron's tensile elongation measuring equipment, measure a specimen piece of 5cm width and 7.5cm length by ASTM D 1682-64 under the condition of 300mm / min tensile speed.

3) Tensile elongation: The elongation at maximum tensile strength measured by the method of 2) is measured.

4) Absorption: It measured according to Edana 150.4-99 method using Lister tester.

5) Endurance Absorption: Measured according to Edana 150.4-99 method and the time (seconds) required to absorb and pass through each time of the solution given three times in the same sample was measured.

Example 1-3

The first component, which is the main raw material in the production of the nonwoven fabric according to the present invention, was polypropylene resin, and the supplier used polyfuel HP562T resin. In addition, as a second component, a polydimethylsiloxane-based surfactant was used, and Ciba Irgasurf HL560 was applied. The amount of use according to each example is shown in Table 1 below. UV stabilizer was added 8% by weight as a third component containing a Hals-based sunscreen.

The resin composed of the content of each component as described above is supplied to the extruder and melted to form a filament in the spinneret. The filaments are laminated on the endless belt and the weight per unit area is determined by the discharge amount of the resin and the belt speed. In each of the examples was produced in the same manner as shown in Table 1 60g / ㎡ (gsm). The formed web is heat bonded by a calender roll to which heat is applied. In each example, as shown in Table 1, the second component contained at least 3% by weight in any one of the radiating parts. Production method of this embodiment was produced by SS nonwoven fabric having two spinning parts.

Various characteristics according to the above-described method were measured for the nonwoven fabric produced as described above and by each example, and the results are shown in Table 1 below.

Comparative Example 1-2

As in the above embodiment, the first component and the third component are the same, and the nonwoven fabric is produced in the same manner as in each of the above examples except that the second component is not added to any of the radiating parts as shown in Table 1 below. Various properties according to the method described above were measured and the results are shown in Table 1 below.

Production conditions and physical properties Item Hydrophilic Additive Input Rate weight burglar Shinto Absorbance Endurance Absorption First floor Second floor MD MD Primary Secondary 6th 10th unit WT% gsm kg / cm % s s Example 1 3 3 60 12 60 3 2 3 4 4 Example 2 4 2 60 12 60 4 2 4 4 5 Example 3 5 2 60 12 60 5 3 5 5 5 Comparative Example 1 0 6 60 12 60 60 40 50 60 60 Comparative Example 2 6 0 60 12 60 50 50 60 60 80

The non-woven fabric having a permanent hydrophilicity of the present invention configured as described above includes a surfactant in a length direction in the fiber by using a surfactant as a predetermined component in a polypropylene resin, so that the nonwoven product has durability of wetness. Persistent wetting for the applied environment can be permanently achieved, especially for long-term natural exposure to weed growth inhibition, which is used for many years. The present invention provides a nonwoven fabric having a permanent hydrophilic property that can be used for a long time because the molecular chain of the nonwoven fabric is not destroyed by sunlight because it has a property of maintaining hydrophilicity and also contains a UV stabilizer of a certain component. to be.

Claims (6)

Melting plastic resin is melted and extruded into a plurality of orifices to form a filament, cooled by cooling air provided from a cooling chamber to solidify the filament, and made a small fiber diameter through the stretching process, and then filament is placed on an endless conveyor belt. In the method of manufacturing a nonwoven fabric having a morphological stability and mechanical properties by laminating a web to form a thermal bond (Point Bond) by thermal calender, There are two filament forming parts in which the raw material supply, the melting part and the spinning part forming the filament are integrated, The molten plastic resin has a polyolefin resin as a first component, a surfactant as a second component, a UV stabilizer as a third component, and supplies the resin of each component to the extruder of each of the filament forming parts. Melt, wherein the second component of the surfactant is contained in the extruder for forming each layer 2 to 5% by weight, so that the layer forming the outer layer contains more than the layer forming the inner layer, The filament is formed from 2 to 6 denier by spinning at the radiating part of each filament forming part, and the formed filament is laminated on the endless conveyor belt to form a web, and thermally bonded by a thermal calender to produce two layers of nonwoven fabrics. A method for producing a nonwoven fabric having permanent hydrophilicity characterized by the above-mentioned. delete The nonwoven fabric of claim 1, wherein the nonwoven fabric of the two layers is a non-woven fabric of a multi-layered structure (SMS) in which one or more meltblown layers are formed in the layer to form a nonwoven fabric having different characteristics. Method of preparation. The method of claim 1, wherein the nonwoven fabric is 20 to 150 g / m 2. The method of claim 4, wherein the nonwoven fabric is 40 to 80 g / m 2. Non-woven fabric having a permanent hydrophilic non-woven fabric according to claim 1 characterized in that it is used for agriculture for weed growth inhibition.