KR20210125914A - Eco-friendly non-woven fabric, non-woven fabric composite and article including the same - Google Patents

Abstract

Disclosed are a non-woven fabric, a composite non-woven fabric, and an article including the same. The disclosed composite non-woven fabric includes a first spunbond non-woven fabric layer, a meltblown non-woven fabric layer that is charged, and a second spunbond non-woven fabric layer, wherein at least one of the first spunbond non-woven fabric layer and the second spunbond non-woven fabric layer includes biopolyethylene.

Description

Eco-friendly non-woven fabric, non-woven fabric composite and article including the same}

Nonwovens, composite nonwovens, and articles comprising the same are disclosed. In more detail, not only excellent mechanical properties and fine dust removal function, but also environmentally friendly nonwoven fabric, composite nonwoven fabric, and articles including the same are disclosed.

In the case of a mask for removing fine dust, it is composed of an inner and outer skin material and a filter material that filters fine dust in the center in multiple layers.

As the filter layer, a melt-blown nonwoven fabric that has been treated is mainly used. Meltblown nonwoven fabric has low shape stability due to low mechanical strength and high flexibility, so structural deformation easily occurs due to external impact or friction. Therefore, in order to protect the melt-blown non-woven fabric layer and provide shape stability, a mask is formed by laminating a non-woven fabric having high mechanical properties such as shape stability and tensile strength on both sides or one side of the melt-blown non-woven fabric layer, mainly spunbond. The nonwoven fabric is laminated through a separate laminating process.

In addition, the spunbond nonwoven fabric, which is generally applied as an inner and outer skin material on one or both sides of the electrostatically treated melt blown material, has only a function of imparting shape stability with little fine dust removal efficiency because the filament is thick and the pores are large. Therefore, among the multi-layered mask nonwoven fabric composition, since fine dust is filtered only in the filter layer located in the central part, there is a problem in that the fine dust is intensively stacked on the filter layer, so that the filtering efficiency decreases with time of use. In some countries, these issues may also affect the respiratory safety of users.

In addition, since the nonwoven fabric used as the inner and outer skin layer is mainly laminated by ultrasonic welding along the outline of the mask, the structure of the meltblown nonwoven fabric charged with the inner layer during the fusion process is changed, so that the filtering performance may be deteriorated.

In addition, as environmental issues arise, the need for eco-friendly products in the sanitary material market is increasing, so it is necessary to develop a mask using eco-friendly raw materials.

One embodiment of the present invention provides not only excellent mechanical properties and fine dust removal function, but also an environmentally friendly nonwoven fabric.

Another embodiment of the present invention provides a composite nonwoven including the nonwoven fabric.

Another embodiment of the present invention provides an article comprising the composite nonwoven fabric.

One aspect of the present invention is

A nonwoven fabric comprising polypropylene and biopolyethylene is provided.

The content of the biopolyethylene may be 10 to 70 parts by weight based on 100 parts by weight of the total weight of the nonwoven fabric.

The content of the biopolyethylene may be 20-50 parts by weight based on 100 parts by weight of the total weight of the nonwoven fabric.

Another aspect of the present invention is

It provides a composite nonwoven fabric comprising the nonwoven fabric.

Another aspect of the present invention is

A first spunbond nonwoven fabric layer, a melt blown nonwoven fabric layer that has been electrostatically treated, and a second spunbond nonwoven fabric layer,

At least one of the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer provides a composite nonwoven fabric including the nonwoven fabric.

The composite nonwoven fabric may include the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbonded nonwoven fabric layer in this order.

At least one of the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may include a core-sheath composite fiber, and the core-sheath composite fiber may include polypropylene in a core and biopolyethylene in a sheath.

The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may not include polyethylene or biopolyethylene alone, respectively.

The electrostatically treated melt blown nonwoven fabric layer may include polypropylene, polyethylene, or biopolyethylene configured to be in close contact with the biopolyethylene.

The electrostatically treated melt blown nonwoven fabric layer may further include polypropylene.

The composite nonwoven fabric may have a carbon dioxide emission of 1 to 20 kg per 1 ton of the composite nonwoven fabric.

The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may each independently emit carbon dioxide emissions of 1 to 6 kg per 1 ton of each spunbond nonwoven fabric layer.

The electrostatically treated melt blown nonwoven fabric layer may have a carbon dioxide emission of 1 to 6 kg per 1 ton of the electrostatically treated melt blown nonwoven fabric layer.

The composite nonwoven fabric may have a fine dust removal efficiency of 18.0 to 99.9%, and a pressure loss of 2.0 to 10.0 mmH ₂ O.

The content of the electrostatically treated melt blown nonwoven fabric layer may be 3 to 50 parts by weight based on 100 parts by weight of the total weight of the composite nonwoven fabric.

Another aspect of the present invention is

An article comprising the composite nonwoven fabric is provided.

The article may be a mask for removing fine dust, a filter for an air purifier, or a filter for an air conditioner.

The composite nonwoven fabric according to an embodiment of the present invention can be applied as a material for filtering fine particles in the air.

In addition, the composite nonwoven fabric has the advantage of being environmentally friendly as well as having excellent mechanical properties and fine dust removal function.

In addition, the composite nonwoven fabric can be used for the purpose of removing various kinds of dust, fine dust, bacteria, etc., and can be applied to various households, vehicles, industrial air conditioners and air purifiers that require air purification as well as health masks.

1 is a view schematically showing a composite nonwoven fabric according to an embodiment of the present invention.
2 is a view schematically showing an apparatus for manufacturing a composite nonwoven used to continuously manufacture a composite nonwoven according to an embodiment of the present invention.

Hereinafter, a composite nonwoven fabric according to an embodiment of the present invention will be described in detail.

In the present specification, "non-woven fabric composite" refers to two or more types of non-woven fabrics manufactured individually and then manufactured through a separate laminating (lamination) post process, or two or more types of non-woven fabrics are produced in one device. It means a nonwoven fabric that is manufactured in a continuous process and integrated with each other. As in the latter case, a "composite non-woven fabric" manufactured by a continuous process may be referred to as a "monolithic non-woven fabric". In addition, the composite nonwoven fabric manufactured by the continuous process as in the latter has a strong interlayer bonding, and excellent morphological stability and filtration performance compared to the composite nonwoven fabric manufactured by a separate process as in the former.

Also, in the present specification, the "electrostatically treated melt blown nonwoven fabric layer" may be manufactured by a separate process or a continuous process. Specifically, the "electrostatically treated melt blown nonwoven layer" is manufactured by separately performing "preparation of melt blown nonwoven fabric" and "electrostatic treatment" as separate processes in two devices, or a continuous process in one device As a result, it may be manufactured by sequentially or simultaneously performing "manufacture of melt blown nonwoven fabric" and "electrostatic treatment".

Also, in this specification, "polyethylene" means traditional polyethylene, not "biopolyethylene".

In addition, in the present specification, "biopolyethylene" is produced by polymerizing ethylene after dehydrating ethanol to obtain ethylene, and refers to polyethylene that is not biodegradable. The biopolyethylene has the same characteristics as conventional polyethylene, but has a very low carbon dioxide emission compared to conventional polyethylene.

Also, in this specification, "operability" refers to a phenomenon in which the spun fibers are broken or agglomerated. Specifically, the molten polymer is spun from the spinneret and then goes through an air cooling and stretching process, and between the spinneret and the air cooling/stretching part, there is a monomer suction part that sucks and removes the gas (fume) discharged from the molten polymer. . Biopolyethylene generates a large amount of gas compared to conventional polyethylene or polypropylene, and accordingly, in order to increase the gas removal ability, the suction strength of the monomer suction part needs to be increased. This causes the fibers to be supercooled. As a result, the fibers are broken or non-uniformly drawn and agglomerated, thereby reducing mobility. On the other hand, if the gas is not removed from the air cooling/stretching part, the surface of the spinneret is contaminated and frequent surface cleaning must be performed, so there is a problem that a line stop situation occurs.

Also in this specification, "fine dust removal efficiency" and "pressure loss" were evaluated by the following methods:

(1) Measurement device: TSI-8130 model of TSI was used.

(2) Formation of aerosol: The measuring device evaporated water after contacting an aqueous sodium chloride solution with air to form an aerosol containing sodium chloride dispersed in the air with an average particle diameter of 0.3 μm and a sodium chloride particle concentration of 18.5 mg/m ³ . .

(3) Evaluation of aerosol removal efficiency: The aerosol permeation flow rate was 95 L/min, and the evaluation area of the nonwoven fabric was 100 cm ² . The aerosol removal efficiency was expressed as fine dust removal efficiency.

(4) Pressure loss evaluation: The aerosol permeation flow rate was 30 L/min, and the evaluation area of the nonwoven fabric was 100 cm ² .

The nonwoven fabric according to an embodiment of the present invention includes polypropylene and biopolyethylene.

The content of the biopolyethylene may be 10 to 70 parts by weight based on 100 parts by weight of the total weight of the nonwoven fabric. If the content of the biopolyethylene is less than 10 parts by weight based on 100 parts by weight of the total weight of the nonwoven fabric, the carbon dioxide reduction effect is insignificant as well as the softness index is lowered, and when it exceeds 70 parts by weight, the mobility is deteriorated.

For example, the content of the biopolyethylene may be 20-50 parts by weight based on 100 parts by weight of the total weight of the nonwoven fabric. If the content of the biopolyethylene is within the above range, excellent carbon dioxide reduction effect, softness index and operability can be obtained.

The nonwoven fabric may be a spunbond nonwoven fabric.

Another embodiment of the present invention provides a composite nonwoven including the nonwoven fabric.

The composite nonwoven fabric includes a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer that has been electrostatically treated, and a second spunbond nonwoven fabric layer.

At least one of the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer may include the nonwoven fabric.

The composite nonwoven fabric may include the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbonded nonwoven fabric layer in this order.

At least one of the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer includes biopolyethylene.

When the composite nonwoven fabric is configured such that the biopolyethylene contained in at least one of the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer is in close contact with the polyethylene or biopolyethylene contained in the electrostatically treated meltblown nonwoven fabric layer , since the biopolyethylene and the polyethylene have high compatibility, the electrostatically treated melt blown nonwoven fabric layer is easily combined with the first spunbond nonwoven fabric layer and/or the second spunbonded nonwoven fabric layer to provide a strong Interlayer bonding strength can be maintained.

In terms of strengthening interlayer bonding strength and eco-friendly image, at least one of the first spunbond nonwoven layer and the second spunbond nonwoven layer includes a core-sheath composite fiber, and the core includes a polypropylene core, and The sheath may include biopolyethylene. As an example, the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer each include a core-sheath composite fiber, and each core-sheath composite fiber includes a core part of polypropylene and a sheath part of biopolyethylene. can As another example, the first spunbond nonwoven fabric layer includes a first core-sheath type composite fiber including a core part containing polypropylene and a sheath part containing biopolyethylene, and the second spunbond nonwoven fabric layer includes a core part containing polypropylene And the sheath may include a second core-sheath type composite fiber comprising polyethylene.

The electrostatically treated melt blown nonwoven fabric layer may include polypropylene, polyethylene, or biopolyethylene configured to be in close contact with the biopolyethylene. As an example, the electrostatically treated melt blown nonwoven fabric layer may include a core sheath-type composite fiber including a core part including polypropylene and a sheath part including polyethylene or biopolyethylene. As another example, the electrostatically treated melt blown nonwoven fabric layer may include only polyethylene or biopolyethylene.

In addition, in terms of further reduction of carbon dioxide emission, the electrostatically treated melt blown nonwoven fabric layer may include biopolyethylene rather than polyethylene.

The electrostatically treated melt blown nonwoven fabric layer may further include polypropylene.

The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may not include polyethylene or biopolyethylene alone, respectively. When the first spunbond nonwoven layer or the second spunbond nonwoven layer includes only polyethylene or biopolyethylene, strength and/or mobility may be reduced.

The carbon dioxide emission of the composite nonwoven fabric is 1 to 20 kg per 1 ton of the composite nonwoven, 1 to 18 kg per 1 ton, 1 to 16 kg per 1 ton, 1 to 14 kg per 1 ton, 1 to 12 kg per 1 ton, 1 to 10 kg per 1 ton, 1 to 1 per ton It can be 8 kg, 1-6 kg per 1 ton, 1-4 kg per 1 ton, or 1-2 kg per 1 ton.

The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may each independently have a carbon dioxide emission of 1 to 6 kg per 1 ton of each spunbond nonwoven layer, 1 to 4 kg per 1 ton, or 1 to 2 kg per 1 ton.

The electrostatically treated melt blown nonwoven fabric layer may have a carbon dioxide emission of 1 to 6 kg per 1 ton of the electrostatically treated melt blown nonwoven layer, 1 to 4 kg per 1 ton, or 1 to 2 kg per 1 ton.

The composite nonwoven fabric has a fine dust removal efficiency of 18.0 to 99.9%, 25.0 to 99.9%, 30.0 to 99.9%, 35.0 to 99.9%, 40.0 to 99.9%, 45.0 to 99.9%, 50.0 to 99.9%, 55.0 to 99.9%, 60.0 ~99.9%, 65.0~99.9%, 70.0~99.9%, 75.0~99.9%, 80.0~99.9%, 85.0~99.9%, 90.0~99.9% or 95.0~99.9%, the pressure loss is 2.0~10.0mmH ₂ O, It may be _{2.0 ~ 8.0mmH 2 O, 2.0 ~} 6.0mmH 2 O or 2.0 ~ 4.0mmH ₂ O.

The composite nonwoven fabric is characterized in that it has a fine particle collecting function by including a melt-blown nonwoven fabric layer that has been treated.

The composite nonwoven fabric may include the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbonded nonwoven fabric layer in this order. However, the present invention is not limited thereto, and the composite nonwoven fabric may include the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbonded nonwoven fabric layer in a different order.

The first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer may each independently further include an additive.

The additives include pigments, light stabilizers, primary antioxidants, secondary antioxidants, metal deactivators, hindered amines, hindered phenols, fatty acid metal salts, triester phosphites, phosphates, fluorine-containing compounds, nucleants or these may include a combination of

Also, in one embodiment, the antioxidant may function as a charge enhancer. Possible charge enhancers include thermally stable organic triazine compounds, oligomers or combinations thereof, which compounds or oligomers further contain at least one nitrogen atom in addition to the nitrogen in the triazine ring.

For example, charge increasing agents for improving charging characteristics are disclosed in US Patent Nos. 6,268,495, 5,976,208, 5,968,635, 5,919,847, and 5,908,598. For example, the charge increasing agent may include a hindered amine-based additive, a triazine additive, or a combination thereof.

As another example, the charge increasing agent is poly[((6-(1,1,3,3-tetramethylbutyl)imino-1,3,5-triazine-2,4-diyl)((2, 2,6,6-tetramethyl-4-piperidyl)imino)hexamethylene ((2,2,6,6-tetramethyl-4-piperidyl)imino)] (manufactured by BASF, CHIMASSORB 944) 1,6-hexanediamine-N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl with (2,4,6-trichloro-1,3,5-triazine) )-polymer, N-butyl-1-butanamine, reaction product with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine) (manufactured by BASF, CHIMASSORB 2020) or a combination thereof may include.

The charge increasing agent is an N-substituted amino aromatic compound, in particular a tri-amino substituted compound such as 2,4,6-trianilino-p-(carbo-2′-ethylhexyl-1′-oxy)- 1,3,5-triazine (manufactured by BASF, UVINUL T-150) may be used. Another charge enhancer is 2,4,6-tris-(octadecylamino)-triazine, also known as tristearyl melamine (“TSM”).

The amount of the charge increasing agent may be 0.25 to 5 parts by weight based on 100 parts by weight of the total weight of the melt blown nonwoven fabric layer. If the content of the charge increasing agent is within the above range, it is possible to obtain a high level of charging performance targeted by the present invention, as well as good spinnability, high strength of the nonwoven fabric, and advantageous in terms of cost.

The composite nonwoven fabric may further include generally known additives such as a heat stabilizer and a weathering agent in addition to the additives.

The content of the electrostatically treated melt blown nonwoven fabric layer may be 3 to 50 parts by weight based on 100 parts by weight of the total weight of the composite nonwoven fabric. When the content of the electrostatically treated melt-blown nonwoven fabric layer is within the above range, a composite nonwoven fabric having excellent filtration performance, shape stability and durability may be obtained.

The composite nonwoven fabric may have a basis weight (mass per unit area) of 10 to 500 g/m ² , for example, 20 to 100 g/m ² .

Hereinafter, a method for manufacturing a composite nonwoven fabric according to various embodiments of the present invention will be described in detail.

The manufacturing method of the composite nonwoven fabric according to the first embodiment of the present invention comprises the steps of preparing a spunbond nonwoven fabric layer (S1), preparing a charge-treated meltblown nonwoven fabric layer (S2), and forming the meltblown nonwoven fabric layer. Laminating the spunbond non-woven fabric layer on both sides one by one (S3).

The electrostatically treated melt blown nonwoven fabric layer manufacturing step (S2) is to separately perform "manufacture of melt blown nonwoven fabric" and "charge treatment" as separate processes in two devices, or as a continuous process in one device "Production of melt blown nonwoven fabric" and "electrostatic treatment" may be performed sequentially or simultaneously.

The method of manufacturing a composite nonwoven fabric according to the second embodiment of the present invention comprises the steps of continuously forming a spunbonded nonwoven layer (S10) and continuously forming a melt blown nonwoven layer on the spunbond nonwoven layer (S20). include

The continuous forming step (S10) of the spunbond non-woven fabric layer is to melt extruded, cooled and stretched a thermoplastic non-conductive polymer to form a fiber yarn, and then laminated the fiber yarn on a screen belt to form a web (web forming). have.

The continuous forming step (S20) of the melt-blown non-woven fabric layer is performed by melt-extruding, hot-air stretching and cooling a thermoplastic non-conductive polymer (additional charging performance enhancer) to form a fiber yarn, and then forming the fiber yarn into the spunbond non-woven fabric layer. In the continuous forming step (S10), it may be laminated on the web-formed spunbond to form a web.

Specifically, the continuous formation of the melt blown nonwoven layer (S20) includes the steps of continuously forming free fibers with a non-conductive polymer (S20-1), continuously spinning the free fibers (S20-2), and Continuously spraying a polar solvent (for example, water) onto the free fibers to continuously charge the free fibers (S20-3) and continuously integrating the free fibers to continuously form a melt-blown nonwoven fabric (S20-4) may be included.

The free fiber continuous charging step (S20-3) may be performed by continuously spraying the polar solvent together with a gas (eg, air).

Hereinafter, it will be described in detail that the free fiber continuous charging step (S20-3) has a heterogeneous or significant effect compared to the prior art.

(1) Generally, as a method for charging during the melt blown process, as in US Patent No. 6,375,886, charging is performed through friction between a polar solvent and a filament being melt-spinning, as in US Patent No. 6,969,484. The melt-blown non-woven fabric was immersed in a polar solvent and charged through friction between water and non-woven fabric while water permeated through the non-woven fabric with a suction device. . As described above, the charging treatment method using a polar solvent requires a separate post-process of drying the polar solvent after the charging treatment, and therefore it is fundamentally impossible to laminate or composite the nonwoven fabric in a continuous process. U.S. Patent No. 6,375,886 and U.S. Patent No. 6,969,484 are incorporated herein by reference in their entirety.

(2) U.S. Patent No. 5,227,172 discloses a method in which a high potential difference is applied between a melt blown die and a collector so that the melt-spun resin is filamentized and inductively charged by the surrounding electric field. However, in this method, a melt-blown nonwoven fabric that has been electrostatically treated can be obtained without a separate post-processing treatment. However, since the non-woven fabric that has been inductively charged by the potential difference has a phenomenon that the charging efficiency is rapidly reduced depending on heat or the surrounding environment, it requires long-term storage in the sales process, such as a mask for removing fine dust, or with an air purifier filter. It has a disadvantage that it is difficult to apply it to a purpose where a long service life is guaranteed. U.S. Patent No. 5,227,172 is incorporated herein by reference in its entirety.

The present inventors spray a polar solvent together with air on the melt-blown nonwoven fabric layer in the form of a two-fluid body, and friction the polar solvent particles with sufficient kinetic energy with a small injection amount to the filament being melt-spun to have a high-efficiency triboelectric effect. We have developed a pretreatment device to do this, and it is characterized by not requiring a separate drying facility because it is sufficiently heated and evaporated by the heated air within the DCD (Die to collector distance) section due to a small injection amount. Due to these characteristics, there is a feature that the nonwoven fabric can be compounded by continuous lamination in combination with the nonwoven fabric manufacturing process.

The nonwoven fabric obtained by electrostatically treating the melt blown nonwoven fabric is continuously polarized so that negative and positive charges exist semi-permanently, and this nonwoven fabric is referred to as an electret nonwoven fabric.

As described above, the manufacturing method of the composite nonwoven fabric may not include a separate drying step for removing the polar solvent sprayed in the free fiber continuous charging step (S20-3).

In addition, as described above, the polar solvent continuously sprayed in the free fiber continuous charging step (S20-3) is continuously heated by heated air within the DCD (Die to collector distance) section of the composite nonwoven fabric manufacturing apparatus. may evaporate.

The manufacturing method of the composite nonwoven fabric may further include the step of continuously forming another spunbond nonwoven fabric layer on the melt blown nonwoven fabric layer (S30).

The manufacturing method of the composite nonwoven fabric is the melt blown nonwoven fabric layer continuous forming step (S20) or the other spunbond nonwoven fabric layer continuous forming step (S30) on one or both sides of the melt blown nonwoven fabric layer after each spunbond layer The step of continuously thermocompressing the nonwoven layer (S40) may be further included.

1 is a view schematically showing a composite nonwoven fabric 10 according to an embodiment of the present invention.

The composite nonwoven fabric 10 according to an embodiment of the present invention includes a first spunbonded nonwoven fabric layer 11 , a melt blown nonwoven fabric layer 12 , and a second spunbonded nonwoven fabric layer 13 .

Another aspect of the present invention provides an article comprising the composite nonwoven fabric.

The article may be a mask for removing fine dust, a filter for an air purifier, or a filter for an air conditioner.

Hereinafter, the present invention will be described in more detail through examples. These examples are for explaining the present invention in more detail, and the scope of the present invention is not limited to these examples.

Example 1-1: Preparation of non-woven fabric

A spunbond nonwoven fabric (SB) was prepared using polypropylene (LG Chemical, H7700) having a melt flow index (MI) of 34 g/10 min and biopolyethylene (Braskem, SHA7260) having a melt flow index (MI) of 20 g/10 min. . The content of the biopolyethylene in the spunbond nonwoven fabric (SB) was 40% by weight. Here, the basis weight of the spunbond nonwoven fabric was adjusted to ^{39 gsm (g/m 2 ).}

Example 1-2: Preparation of non-woven fabric

A spunbond nonwoven fabric (SB) was prepared in the same manner as in Example 1, except that the content of biopolyethylene in the spunbond nonwoven fabric (SB) was changed to 10% by weight.

Example 1-3: Preparation of non-woven fabric

A spunbond nonwoven fabric (SB) was prepared in the same manner as in Example 1, except that the content of biopolyethylene in the spunbond nonwoven fabric (SB) was changed to 20 wt%.

Example 1-4: Preparation of nonwoven fabric

A spunbond nonwoven fabric (SB) was prepared in the same manner as in Example 1, except that the content of biopolyethylene in the spunbond nonwoven fabric (SB) was changed to 50 wt%.

Example 1-5: Preparation of non-woven fabric

A spunbond nonwoven fabric (SB) was prepared in the same manner as in Example 1, except that the content of biopolyethylene in the spunbond nonwoven fabric (SB) was changed to 70% by weight.

Comparative Example 1-1: Preparation of nonwoven fabric

A spunbond nonwoven fabric (SB) was prepared in the same manner as in Example 1, except that the content of biopolyethylene in the spunbond nonwoven fabric (SB) was changed to 5% by weight.

Comparative Example 1-2: Preparation of nonwoven fabric

A spunbond nonwoven fabric (SB) was prepared in the same manner as in Example 1, except that the content of biopolyethylene in the spunbond nonwoven fabric (SB) was changed to 80 wt%.

In Examples 1-1 to 1-5 and Comparative Examples 1-1 to 1-2, the content of biopolyethylene used in the preparation of the spunbond nonwoven fabric (SB) is summarized and shown in Table 1 below.

Example comparative example 1-1 1-2 1-3 1-4 1-5 1-1 1-2 Content of biopolyethylene (wt%) 40 10 20 50 70 5 80

Evaluation Example 1: Evaluation of the physical properties of the nonwoven fabric

The carbon dioxide emission, softness index, MD compressive strength, CD compressive strength, mobility and irreversible bendability of each nonwoven fabric prepared in Examples 1-1 to 1-5 and Comparative Examples 1-1 to 1-2 are as follows. The evaluation was performed in the same manner as described above, and the results are shown in Table 2 below.

(1) CO2 emission: The CO2 emission of biopolyethylene was evaluated using data from a joint study conducted by Braskem and TOYOTA TSUSHO CORPORATION on November 18, 2010 (http://news.bio-based.eu/life) -cycle-analysis-concludes-green-polyethylene-can-reduce-ghg-emission/). Carbon dioxide emissions of polyethylene and polypropylene were evaluated using carbon emission data modeled by the Ministry of Commerce, Industry and Energy and the National Clean Production Support Center of the Korea Institute of Industrial Technology on September 30, 2002.

(2) Softness index: The handle-o-meter was measured according to WSP 90.3, and the result was recorded as the softness index. In the softness index, the smaller the number, the softer it is.

(3) MD tensile strength: It was measured according to the general long fiber nonwoven fabric test method of KS K 0756.

(4) Ring crush compressive strength measurement method: According to the JIS P8126 method, under the condition of a test speed of 10mpm, a sample with a size of 15cm x 3cm is made into a ring shape with an inner diameter of 4.5cm, and the part where the sheets overlap is fixed with a stapler, and then compressive strength test The load value taken when pressing the ring-shaped sheet was measured and recorded as the ring crush compressive strength.

(5) Mobility: Mobility was evaluated by observing whether the spun fibers break or agglomerate.

(6) irreversible pleating property: When a nonwoven fabric is bent using a pleating machine (manufactured by Samsung Machinery, SKP 1700LBS), the bent shape is not deformed without external force applied. Whether or not it has the property of maintaining the original bent shape was evaluated.

Example comparative example 1-1 1-2 1-3 1-4 1-5 1-1 1-2 CO2 emissions (g/ton) 3195 4118 3810 2888 2273 4371 1965 Softness index (g) 6.0 7.8 6.2 5.6 5.2 9.0 4.4 MD tensile strength (kgf/5cm) 6.6 7.6 7.2 6.2 5.0 8.2 4.5 Ring crush compressive strength (cN) 24 27 26 23 20 29 18 mobility Good Good Good Good Good Good error irreversible bendability you you you you you you radish

Referring to Table 2, each of the nonwoven fabrics prepared in Examples 1-1 to 1-5 had a low carbon dioxide emission of less than 4200 g/ton, a softness index of less than 8.0 g, and a MD tensile strength of 5 kgf. It was found to be as high as /5cm or more, and the ring crush compressive strength was also as high as 20cN or more, as well as good mobility and irreversible bendability.

However, the nonwoven fabric prepared in Comparative Example 1-1 has a high MD tensile strength of 5 kgf/5 cm or more, a ring crush compressive strength of 20 cN or more, good mobility, and irreversible bendability, but a carbon dioxide emission of 4300 g It was found to be higher than /ton, and the softness index was also higher than 8.0g.

In addition, the nonwoven fabric prepared in Comparative Example 1-2 had a low carbon dioxide emission of less than 4200 g/ton, and a softness index of less than 8.0 g, but had a low MD tensile strength of less than 5 kgf/5cm, and a ring crush compressive strength. It was found that it was low as less than 20cN, had poor mobility, and had no irreversible bendability.

Example 2-1: Preparation of composite nonwoven fabric

Polypropylene (LG Chem, H7700) having a melt flow index (MI) of 34 g/10 min and biopolyethylene (Braskem, SHA7260) was used, but the polypropylene was used to form the deep part and the biopolyethylene was used to form the sheath, and as a polymer for forming the melt blown nonwoven layer (MB), the melt flow index (MFR) was 1000 g/10 min. Polypropylene (LG Chem, H7910) and biopolyethylene (Braskem, SHA7260) having a melt flow index (MI) of 20g/10min were used, but the polypropylene was used for forming the deep part and the biopolyethylene was used for forming the sheath. , As the polymer for forming the second spunbond nonwoven layer (SB2), polypropylene (LG Chem, H7700) having a melt flow index (MI) of 34 g/10 min and biopolyethylene (Braskem) having a melt flow index (MI) of 20 g/10 min , SHA7260) was used, but the polypropylene was used for forming a deep part and the biopolyethylene was used for forming a sheath. The content of the biopolyethylene in each of the polymer for forming the first spunbond nonwoven layer (SB1), the polymer for forming the melt blown nonwoven layer (MB) and the polymer for forming the second spunbond nonwoven layer (SB2) is 40 weight % was. In addition, Chimassorb 944, a hindered amine light stabilizer, was added to the polymer for forming the melt blown nonwoven fabric layer (MB) in an amount of 0.5 wt%. Thereafter, a composite nonwoven fabric in the form of spunbond-meltblown-spunbond (SMS) was continuously manufactured using an apparatus for manufacturing a composite nonwoven fabric as shown in FIG. 2 . Specifically, the melt blown nonwoven fabric layer (MB) is continuously charged by contacting water with air through a two-fluid nozzle in the apparatus for manufacturing the composite nonwoven fabric, and then is laminated on top of the spunbond nonwoven fabric layer (SB), Another spunbond nonwoven fabric layer SB is laminated on top of the melt blown nonwoven fabric layer MB. As a result, an SMS nonwoven fabric laminate was obtained. Thereafter, the SMS nonwoven fabric laminate was manufactured in the form of a single composite nonwoven fabric through a thermocompression bonding process between a roll having an embossed pattern and a roll having no irregularities. Here, the total basis weight of the SMS composite nonwoven fabric ^{was adjusted to 100 gsm (g/m 2} ), of which the basis weight of the first spunbond nonwoven fabric layer (SB2) and the basis weight of the second spunbond nonwoven fabric layer (SB2) were adjusted to 39gsm, respectively. and the basis weight of the melt blown nonwoven fabric layer (MB) was adjusted to 22 gsm.

Example 2-2: Preparation of composite nonwoven fabric

As a polymer for forming the melt-blown non-woven fabric layer (MB), no polypropylene is used and only biopolyethylene (Braskem, SHA7260) having a melt flow index (MI) of 20 g/10 min is used. An SMS composite nonwoven fabric was prepared in the same manner as in Example 2-1, except that a melt-blown nonwoven fabric layer (MB) was formed by spinning the mixture.

Example 2-3: Preparation of composite non-woven fabric

Polypropylene (LG Chemical, H7700) having a melt flow index (MFR) of 34 g/10 min and polyethylene having a melt flow index (MI) of 30 g/10 min (SK chemical, MM810) as a polymer for forming the second spunbond non-woven fabric layer (SB2) ) using the same method as in Example 2-1, except that the polypropylene was used for forming the core and the polyethylene was used for forming the sheath to form the second spunbond nonwoven layer (SB2). An SMS composite nonwoven fabric was prepared.

Comparative Example 2-1: Preparation of composite nonwoven fabric

As the polymer for forming the second spunbond non-woven fabric layer (SB2), polypropylene and biopolyethylene are not used at all, and only polyethylene (SK chemical, MM810) having a melt flow index (MI) of 30 g/10 min is used, and the cross-sectional shape has a core-sheath shape. An SMS composite nonwoven fabric was prepared in the same manner as in Example 2-1, except that the second spunbond nonwoven fabric layer (SB2) was formed by spinning monotype fibers instead of the nonwoven fabric.

Comparative Example 2-2: Preparation of composite nonwoven fabric

As a polymer for forming the melt blown nonwoven fabric layer (MB), polypropylene and biopolyethylene are not used at all, and only polyethylene (SK chemical, MM810) with a melt flow index (MI) of 30 g/10 min is used. Melt-blown non-woven fabric layer (MB) is formed by spinning monotype fibers, and melt flow index (MI) is 30 g/ The same as in Example 2-1, except that the second spunbond nonwoven fabric layer (SB2) was formed by spinning a mono-type fiber having a cross-sectional shape rather than a core-sheath type using only polyethylene (SK chemical, MM810) of 10 min. SMS composite nonwoven fabric was prepared by the method.

Comparative Example 2-3: Preparation of composite nonwoven fabric

As a polymer for forming the melt-blown non-woven fabric layer (MB), no polypropylene is used and only biopolyethylene (Braskem, SHA7260) having a melt flow index (MI) of 20 g/10 min is used. Polyethylene having a melt flow index (MI) of 30 g/10 min without using polypropylene or bio-polyethylene as a polymer for forming the second spunbond non-woven fabric layer (SB2). SMS in the same manner as in Example 2-1, except that only (SK chemical, MM810) was used to form the second spunbond nonwoven fabric layer (SB2) by spun fibers having a mono-type cross-section rather than a core-sheath type. A composite nonwoven fabric was prepared.

Comparative Example 2-4: Preparation of composite nonwoven fabric

As a polymer for forming the melt blown nonwoven fabric layer (MB), polypropylene and biopolyethylene are not used at all, and only polyethylene (SK chemical, MM810) with a melt flow index (MI) of 30 g/10 min is used. Melt-blown non-woven fabric layer (MB) is formed by spinning monotype fibers, and as a polymer for forming the second spunbond non-woven fabric layer (SB2), no polypropylene is used and the melt flow index (MI) is 20 g/10 min. SMS in the same manner as in Example 2-1, except that the second spunbond nonwoven fabric layer (SB2) was formed by spinning a mono-type fiber having a cross-sectional shape rather than a core-sheath type using only polyethylene (Braskem, SHA7260). A composite nonwoven fabric was prepared.

Comparative Example 2-5: Preparation of composite nonwoven fabric

As a polymer for forming the melt-blown non-woven fabric layer (MB), no polypropylene is used and only biopolyethylene (Braskem, SHA7260) having a melt flow index (MI) of 20 g/10 min is used. is spun to form a melt blown nonwoven layer (MB), and as a polymer for forming the second spunbond nonwoven layer (SB2), no polypropylene is used and the melt flow index (MI) is 20 g/10 min. , SHA7260), except that the second spunbond nonwoven fabric layer (SB2) was formed by spun fibers having a mono-type cross-sectional shape rather than a core-sheath type, and the SMS composite nonwoven fabric was prepared in the same manner as in Example 2-1. prepared.

Comparative Example 2-6: Preparation of composite nonwoven fabric

Polypropylene (LG Chem, H7910) with a melt flow index (MFR) of 1000 g/10 min and biopolyethylene (Braskem, SHA7260) with a melt flow index (MI) of 20 g/10 min as a polymer for forming a melt blown nonwoven fabric layer (MB) SMS was used in the same manner as in Example 2-1, except that the biopolyethylene was used for forming the deep part and the polypropylene was used for forming the sheath part to form a melt blown nonwoven fabric layer (MB). A composite nonwoven fabric was prepared.

Comparative Example 2-7: Preparation of composite nonwoven fabric

Polypropylene (LG Chem, H7700) having a melt flow index (MFR) of 34 g/10 min and biopolyethylene (Braskem, SHA7260) having a melt flow index (MI) of 20 g/10 min as a polymer for forming the second spunbond non-woven fabric layer (SB2) ), except that the second spunbond non-woven fabric layer (SB2) was formed using the biopolyethylene for forming the core and the polypropylene for forming the sheath, the same method as in Example 2-1 SMS composite nonwoven fabric was prepared.

Comparative Example 2-8: Preparation of composite nonwoven fabric

As a polymer for forming the second spunbond non-woven fabric layer (SB2), no biopolyethylene is used and only polypropylene (LG Chem, H7700) having a melt flow index (MFR) of 34 g/10 min is used. An SMS composite nonwoven fabric was prepared in the same manner as in Example 2-1, except that the second spunbond nonwoven fabric layer (SB2) was formed by spinning the fibers of the same type.

Comparative Example 2-9: Preparation of composite nonwoven fabric

As a polymer for forming the melt blown non-woven fabric layer (MB), it does not use any biopolyethylene and uses only polypropylene (LG Chem, H7910) with a melt flow index (MI) of 1000 g/10 min. An SMS composite nonwoven fabric was prepared in the same manner as in Example 2-1, except that a melt blown nonwoven fabric layer (MB) was formed by spinning fibers.

Evaluation Example 2: Evaluation of the physical properties of the composite nonwoven fabric

Carbon dioxide emission, softness index, MD compressive strength, CD compressive strength, mobility and irreversible bendability of each composite nonwoven fabric prepared in Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-9 The evaluation was performed in the same manner as in Evaluation Example 1, and the results are shown in Table 3 below. In addition, the delamination was observed with the naked eye, and the results are shown in Table 3 below.

Example comparative example 2-1 2-2 2-3 2-1 2-2 2-3 2-4 CO2 emissions (g/ton) 3195 2580 3680 3790 4392 3178 3178 Softness index (g) SB1 3.0 3.0 3.0 3.0 3.0 3.0 3.0 SB2 3.0 3.0 3.0 3.0 3.0 3.0 3.0 MD tensile strength (kgf/5cm) 16.5 16.3 16.5 16.0 15.8 15.6 15.7 Ring crush compressive strength
(cN) 48.0 47.8 48.1 45.0 44.6 44.7 44.5 mobility Good Good Good Good Good Good error irreversible bendability you you you radish radish radish radish Whether delamination does not exist does not exist does not exist does not exist does not exist does not exist does not exist comparative example 2-5 2-6 2-7 2-8 2-9 CO2 emissions (g/ton) 1965 2990 2990 3605 3605 Softness index (g) SB1 3.0 3.0 3.0 3.0 3.0 SB2 3.0 3.0 4.8 4.8 3.0 MD tensile strength (kgf/5cm) 15.5 16.6 16.4 17.5 17.0 Ring crush compressive strength
(cN) 44.6 47.9 47.7 49.3 48.3 mobility error error error error Good irreversible bendability radish you you you you Whether delamination does not exist generation generation generation generation

Referring to Table 3, each of the composite nonwoven fabrics prepared in Examples 2-1 to 2-3 has low carbon dioxide emissions, low softness index, high MD tensile strength and ring crush compressive strength, and good mobility. It was also found to have irreversible bendability and no delamination.

However, the composite nonwoven fabric prepared in Comparative Examples 2-1 to 2-9 has a large amount of carbon dioxide emission, a high softness index, low MD tensile strength and ring crush compressive strength, poor mobility, or irreversible No curvature and/or delamination appeared to occur.

Although the present invention has been described with reference to the drawings and embodiments, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: composite nonwoven fabric 11: first spunbond nonwoven fabric layer
12: melt blown nonwoven layer 13: second spunbond nonwoven layer

Claims (17)

A nonwoven fabric comprising polypropylene and biopolyethylene. According to claim 1,
The content of the biopolyethylene is 10 to 70 parts by weight based on 100 parts by weight of the total weight of the nonwoven fabric. 3. The method of claim 2,
The content of the biopolyethylene is 20-50 parts by weight based on 100 parts by weight of the total weight of the nonwoven fabric. A composite nonwoven fabric comprising the nonwoven fabric according to any one of claims 1 to 3. A first spunbond nonwoven fabric layer, a melt blown nonwoven fabric layer that has been electrostatically treated, and a second spunbond nonwoven fabric layer,
At least one of the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer is a composite nonwoven fabric comprising the nonwoven fabric according to claim 2 . 6. The method of claim 5,
The composite nonwoven fabric comprises the first spunbond nonwoven fabric layer, the electrostatically treated meltblown nonwoven fabric layer, and the second spunbonded nonwoven fabric layer in this order. 7. The method of claim 6,
The first spun-bonded non-woven fabric layer and the second spun-bonded non-woven fabric layer is a composite non-woven fabric that does not contain only polyethylene or bio-polyethylene, respectively. 8. The method of claim 7,
At least one of the first spunbond nonwoven layer and the second spunbond nonwoven layer includes a core-sheath composite fiber, and the core-sheath composite fiber has a core part including polypropylene and a sheath part including biopolyethylene. 9. The method of claim 8,
The electrostatically treated melt blown nonwoven fabric layer is a composite nonwoven fabric comprising polypropylene, polyethylene or biopolyethylene configured to be in close contact with the biopolyethylene. 10. The method of claim 9,
The electrostatically treated melt blown nonwoven fabric layer is a composite nonwoven fabric further comprising polypropylene. 6. The method of claim 5,
The composite nonwoven fabric has a carbon dioxide emission of 1 to 20 kg per 1 ton of the composite nonwoven fabric. 6. The method of claim 5,
The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer each independently have a carbon dioxide emission of 1 to 6kg per 1 ton of each spunbond nonwoven fabric layer. 6. The method of claim 5,
The electrostatically treated melt blown nonwoven fabric layer is a composite nonwoven fabric having a carbon dioxide emission of 1 to 6 kg per 1 ton of the electrostatically treated melt blown nonwoven fabric layer. 7. The method of claim 6,
The composite nonwoven fabric has a fine dust removal efficiency of 18.0 to 99.9%, and a pressure loss of 2.0 to 10.0 mmH ₂ O. 6. The method of claim 5,
The content of the electrostatically treated melt blown nonwoven fabric layer is 3 to 50 parts by weight based on 100 parts by weight of the total weight of the composite nonwoven fabric. 16. An article comprising the composite nonwoven according to any one of claims 1 to 15. 17. The method of claim 16,
The article is an article that is a mask for removing fine dust, a filter for an air purifier, or a filter for an air conditioner.

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