JP6584907B2 - Polyolefin-based spunbond nonwoven fabric - Google Patents

Description

  The present invention relates to a spunbonded nonwoven fabric that suppresses the amount of carbon dioxide generated during combustion suitable for sanitary materials.

In recent years, the use of disposable diapers has been remarkable, and the amount of use has been increasing year by year. On the other hand, because of its widespread use, it has caused environmental problems such as the generation of harmful substances during incineration at the time of disposal. Among them, the current situation is that it is difficult to reduce carbon dioxide, which is strongly desired to reduce emissions due to its impact on global warming, because it is the final product of combustion.
On the other hand, there are biodegradable resins that naturally decompose by landfill as a countermeasure against incineration, but it is difficult to replace all diapers used in large quantities and dispose of by landfill. The current situation occupies the right position.
In addition, recycling is being used as a method to reduce the amount of exhaust gas itself, but recycling has only been partially adopted, and physical properties such as strength decrease each time reuse is repeated. Since it will be incinerated, it will not be a fundamental solution to carbon dioxide emissions. In order to solve the carbon dioxide emission problem as described above, a method of blending a compound that suppresses the amount of carbon dioxide into a resin (for example, see Patent Documents 1 and 2 below) has been proposed.

Patent Documents 1 and 2 describe a polyethylene film produced by adding a compound that suppresses the generation of carbon dioxide to a resin. However, additives such as those described in Patent Documents 1 and 2 usually cause aggregation in the film production process, and cause gelation (fish eye) and yarn breakage in the fiber production process. In particular, the aggregation of additives in the fiber has a small fiber cross-sectional area, and thus significantly affects the spinnability in the fiber production process during spinning.
Further, when an additive such as a carbon dioxide generation amount inhibitor is added, the crystal orientation in the fiber is usually suppressed, and the strength of the fiber / nonwoven fabric is lowered. Further, if the additive is aggregated, the fiber breaks from the aggregated portion, leading to the breakage of the cloth, and the strength / elongation (toughness) of the nonwoven fabric is lowered.

International Publication No. 2011/037238 JP 2013-122020 A

  The problem to be solved by the present invention is that the carbon dioxide generation amount inhibitor is uniformly dispersed in the polyolefin resin constituting the fiber, and the spinning condition is optimized to optimize the crystal orientation and fabric toughness of the fiber. Is to provide a polyolefin-based spunbonded nonwoven fabric that further suppresses carbon dioxide generation during combustion.

  The carbon dioxide generation amount inhibitor added to the nonwoven fabric of the present invention has good heat resistance, can be directly kneaded into the fiber during spinning, and is uniformly dispersed in the polyolefin resin constituting the fiber. In addition, the spinnability in the fiber production process is good without causing aggregation, and high spinning speed fibers can be obtained without causing yarn breakage, and fibers with high strength can be formed. Further, the carbon dioxide generation amount inhibitor does not decrease the crystal orientation of the fiber even when added to the polyolefin resin constituting the fiber, and can be improved by controlling the spinning conditions. Further, the high elongation of the nonwoven fabric to be formed can be improved. A nonwoven fabric having high strength and elongation can be suitably used as a sanitary material because it has an effect of suppressing production process stability and breakage during wearing, but according to the present invention, it also has an effect of suppressing carbon dioxide generation. It became a thing. That is, the present invention is as follows.

[1] A polyolefin-based spunbond nonwoven fabric composed of polyolefin-based resin fibers, in which a carbon dioxide generation amount inhibitor having a particle diameter of 150 nm to 250 nm is dispersed in the polyolefin-based resin, and 0.03 to 0.30 The nonwoven fabric , which is contained by weight% , and wherein the carbon dioxide generation amount inhibitor is at least one selected from the group consisting of magnesium oxide, aluminosilicate, and titanate compound .
[2] The polyolefin-based spunbonded nonwoven fabric according to [1], wherein the nonwoven fabric has a tensile strength of 20 to 180 N / 50 mm, a tensile elongation of 20 to 70%, and a toughness index of 40 to 100. .
[3] The average single yarn fineness of the fibers constituting the nonwoven fabric is 0.7 to 3.0 dtex, and the basis weight of the nonwoven fabric is 8 to 60 g / m ^2. Polyolefin spunbond nonwoven fabric.
[4] The polyolefin-based spunbonded nonwoven fabric according to any one of [1] to [3], wherein the polyolefin-based resin further contains a dispersion aid.
[ 5 ] The polyolefin-based spunbonded nonwoven fabric according to [ 4 ], wherein the dispersion aid is at least one selected from the group consisting of fatty acid metal salts, polymeric surfactants, and amphiphilic lipids.
[ 6 ] The polyolefin-based spunbonded nonwoven fabric according to any one of [1] to [ 5 ], wherein the polyolefin-based resin is polypropylene.
[ 7 ] A sanitary material containing the polyolefin-based spunbonded nonwoven fabric according to any one of [1] to [ 6 ].

  Usually, adding an additive to the resin constituting the fiber causes the yarn breakage in the fiber production process due to the aggregation of the additive, and the crystal orientation in the fiber is suppressed. The strength / elongation (toughness) is also reduced. On the contrary, the nonwoven fabric of the present invention has the carbon dioxide generation amount inhibitor particles uniformly dispersed in the fibers of the polyolefin resin, thereby improving the toughness index, suppressing the carbon dioxide generation amount during combustion, and Since it has high elongation, it has the effect of suppressing process stability during production and breaking during wearing, and can be suitably used as a sanitary material.

Hereinafter, embodiments of the present invention will be described in detail.
The fiber which comprises the nonwoven fabric of this embodiment is polyolefin resin, for example, resin, such as a copolymer of polyethylene, a polypropylene, those monomers, and another alpha olefin. The polyolefin resin may be any.

  For example, polypropylene may be a polymer synthesized by a general Ziegler Natta catalyst, or may be a polymer synthesized by a single site active catalyst typified by metallocene. Moreover, ethylene random copolymer polypropylene may be sufficient. Other α-olefins include those having 3 to 10 carbon atoms, specifically, propylene, 1-butene, 1-pentene, 1-hexane, 4-methyl-1-pentene, 1-octene and the like. . Of these, homopolypropylene is the main component in view of texture, strength, and dimensional stability.

  In addition, other additives such as a nucleating agent, a flame retardant, an inorganic filler, a pigment, a lubricant, a colorant, a heat stabilizer, an antistatic agent and the like may be added to the polyolefin resin.

  In the case of polypropylene, the lower limit of MFR is preferably 20 g / 10 minutes or more, more preferably more than 30 g / 10 minutes, still more preferably more than 40 g / 10 minutes, and particularly preferably more than 53 g / 10 minutes. The upper limit is preferably 85 g / 10 min or less, more preferably 70 g / 10 min or less, and still more preferably 60 g / 10 min or less. In this specification, MFR is JIS-K7210 "Testing method of melt mass flow rate (MFR) and melt volume flow rate (MVR) of plastic-thermoplastic plastic", test temperature 230 ° C, test load 2.16 kg. It was measured according to.

  The spunbond nonwoven fabric of this embodiment can be manufactured by the following method. A polyolefin resin is melt-extruded and discharged as a thread from a spinneret having a large number of spinning holes. Next, the discharged yarn is pulled by a pulling device while being cooled by applying cold air controlled at 5 ° C. to 20 ° C. The yarns coming out of the traction device are accumulated on a conveyor and conveyed as a nonwoven web. The nonwoven webs being conveyed may be laminated to form a multilayer laminated nonwoven web. Depending on the purpose, the spunbond (S) nonwoven fabric of the present invention may be laminated with meltblown (M) fibers, or may have a structure laminated with SM, SMS, SMMS, and SMSMS.

  The spinning temperature is preferably 190 ° C or higher and 260 ° C or lower, more preferably 200 ° C or higher and 255 ° C or lower, further preferably 205 ° C or higher and 230 ° C or lower, and particularly preferably 210 ° C or higher and 225 ° C or lower. When the spinning temperature is 260 ° C. or lower, the occurrence of yarn breakage due to less contamination of the spinneret surface due to the resin decomposition product and the lower viscosity of the resin can be suppressed. On the other hand, when the spinning temperature is 190 ° C. or higher, the occurrence of yarn breakage due to an increase in the viscosity of the resin can be suppressed, and further, resin leakage and the like due to an increase in the spinneret pressure during spinning can be suppressed.

  In the case of joining a nonwoven web composed of polyolefin-based spunbond fibers to form a nonwoven fabric, as a joining means, a calender heating adhesive method such as a flat calender roll press, an emboss roll press, etc. Various heating methods such as a hot air penetration type, an infrared heater type, a method of blowing hot air on both surfaces of a nonwoven fabric, or a method of introducing into a heated gas are used. In the non-heating method, a needle punch method, hydroentangled adhesion, or the like is used. An embossing roll press is preferable from the viewpoint of obtaining a nonwoven fabric having softness, moderate strength, and elongation suitable for use in sanitary materials.

  In the embossing roll press, it is preferable from the viewpoint of productivity that the embossing roll press is processed through a pair of rolls of a combination of a metal embossing roll and a metal flat roll. From the viewpoint of maintaining the shape of the nonwoven web and the strength of the finally obtained nonwoven fabric, the embossed area ratio is preferably 5 to 30%, more preferably 5 to 20%, and even more preferably 6 to 15%. Moreover, the softness of a nonwoven fabric can be acquired, so that the depth of embossing is deep, Preferably it is 0.2-2.0 mm, More preferably, it is 0.7-1.5 mm. The embossed shape is not particularly limited, but is preferably a circular shape, an elliptical shape, a diamond shape, or a rectangular shape, and these shapes have softness, suitable strength, and elongation suitable for use in sanitary materials. A nonwoven fabric can be obtained.

The tensile strength of the nonwoven fabric is preferably 20 N / 50 mm or more and 180 N / 50 mm or less, and the tensile elongation is preferably 20% or more and 70% or less. The toughness index is expressed by the following formula (1):
Toughness index = tensile strength (N / 50 mm) × tensile elongation (%) / weight per unit. . . Formula (1)
And is preferably 40 or more and 100 or less, more preferably 45 or more and 80 or less, and still more preferably 50 or more and 70 or less.
When the tensile strength, tensile elongation, and toughness index are in this range, the processability of the nonwoven fabric and the range suitable for use as a sanitary material are obtained. If the toughness index is out of this range, problems such as fabric breakage in the process and wrinkle generation may occur easily.

Moreover, there is no restriction | limiting about the fineness of the fiber which comprises a nonwoven fabric, From the point of productivity or a texture, the fineness of the fiber used for a normal spun bond nonwoven fabric becomes like this. Preferably it is about 0.7-3.0 dtex, More preferably, it is 1. It is 0 to 2.8 dtex, more preferably 1.2 to 2.5 dtex.
The basis weight of the nonwoven fabric is preferably 8 g / m ² or more and 60 g / m ² or less, more preferably 10 g / m ² or more and 40 g / m ² or less, and further preferably 10 g / m ² or more and 30 g / m ² or less. If it is 8 g / m ² or more, it satisfies the strength as a non-woven fabric used as a sanitary material, while if it is 60 g / m ² or less, it satisfies the flexibility of the non-woven fabric used as a sanitary material, and it is thick in appearance. Does not give an impression.

  The nonwoven fabric may contain a hydrophilizing agent. The hydrophilizing agent used is a non-ionic active agent to which ethylene oxide such as higher alcohol, higher fatty acid, alkylphenol or the like is added in consideration of safety to the human body, safety in the process, alkyl phosphate salt, An anionic activator such as an alkyl sulfate is used alone or as a mixture.

  As a method of incorporating a hydrophilizing agent, a diluting hydrophilizing agent can be used, and existing methods such as dipping, spraying, and coating (kiss coater, gravure coater) can be adopted. It is preferable to apply the agent diluted with a solvent such as water.

  When the hydrophilizing agent is diluted with a solvent such as water and applied, a drying step may be required. As a drying method at that time, a known method using convective heat transfer, conduction heat transfer, radiant heat transfer, or the like can be employed, and drying by hot air or infrared rays, drying by heat contact, or the like can be used.

  The adhesion amount of the hydrophilizing agent varies depending on the required performance, but usually it is preferably in the range of 0.05% by weight to 1.00% by weight, more preferably 0.15% by weight to 0.00%. It is 8 wt% or less, more preferably 0.2 wt% or more and 0.6 wt% or less. When the adhesion amount is within this range, the hydrophilic performance as a sanitary material top sheet is satisfied, and the processing suitability is also good.

  The polyolefin-based spunbonded nonwoven fabric of the present embodiment can suppress the amount of carbon dioxide generated during combustion, and can be suitably used for sanitary materials that are incinerated after use. As a sanitary material, it can be used suitably for disposable diapers, sanitary napkins, incontinence pads, etc., and can be used for the top sheet on the surface and the back sheet on the outside.

  In the polyolefin-based spunbonded nonwoven fabric of this embodiment, the particles of the carbon dioxide generation amount inhibitor having a particle diameter of 150 to 250 nm are preferably uniformly dispersed in the polyolefin-based resin constituting the nonwoven fabric. The particle system is more preferably 150 to 200 nm. If the particle size is 150 nm or more, an effect of suppressing the amount of carbon dioxide generated is expressed, and if it is 250 nm or less, aggregation is not caused and yarn breakage does not occur in the spinning process. The addition amount of the carbon dioxide generation amount inhibitor uniformly dispersed in the fiber is preferably 0.03 to 0.30% by weight, more preferably 0.05 to 0.25% by weight, and still more preferably 0.10 to 0.10%. 0.20% by weight. If the amount is too large, thread breakage may occur during spinning. In particular, the aggregation of additives in the fiber has a small fiber cross-sectional area, and thus significantly affects the spinnability in the fiber production process during spinning. On the other hand, if the addition amount is less than 0.03% by weight, the carbon dioxide generation amount suppressing effect may not be exhibited.

In the specification of the present application, the carbon dioxide generation amount inhibitor may be any substance as long as it is a substance that chemically or physically adsorbs carbon dioxide. For example, metal hydroxide, metal oxide, aluminosilicate is used. , Titanic acid compounds , lithium silicate, silica gel, alumina, activated carbon.

  Examples of the metal hydroxide include lithium hydroxide, sodium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide.

  Examples of the metal oxide include magnesium oxide, calcium oxide, and zinc oxide.

  Examples of the aluminosilicate include amorphous aluminosilicate, natural zeolite, and synthetic zeolite.

  Examples of the titanate compound include barium titanate and barium orthotitanate.

  A dispersion aid may be further added to the polyolefin resin. The dispersion aid may be at least one of a fatty acid metal salt, a polymer surfactant, and an amphiphilic lipid.

  For example, a carbon dioxide generation inhibitor and a polyolefin resin crystal nucleating agent can be encapsulated by minute capsule-like liposomes and efficiently dispersed uniformly in the polyolefin resin.

  Further, a carbon dioxide inhibitor and a dispersion aid are mixed by a method such as dispersion treatment, supercritical fluid treatment, ultrasonic irradiation, stirring treatment, etc., and the resulting mixture of carbon dioxide generation amount inhibitor and dispersion aid is obtained. Can be uniformly dispersed in the resin without agglomerating the carbon dioxide generation amount inhibitor having low compatibility with the resin, and has a high carbon dioxide absorption effect. An amount-inhibiting resin can be obtained.

  In the polyolefin-based spunbonded nonwoven fabric of the present embodiment, the carbon dioxide generation amount suppressing effect is preferably 30% or more, more preferably 40% or more, and further preferably 50% or more. If it is the carbon dioxide generation amount suppression effect of this range, it can be said that it is the carbon dioxide reduction effect desired from the influence on global warming.

  In the production of the polyolefin-based spunbonded nonwoven fabric of this embodiment, since the carbon dioxide generation amount inhibitor is uniformly dispersed in the fiber, the spinnability is good and fiber breakage hardly occurs in the spinning process. Furthermore, the crystal orientation of the fibers is not lowered, and conversely, the crystal orientation can be improved by controlling the spinning conditions within a specific range. Can be improved.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited only to the following Example.
In addition, the evaluation method of the various characteristics used in the Example and the comparative example is as follows, and the obtained physical property is shown in the following Table 1.

1. Average single yarn fineness (dtex)
A test piece of 1 cm square was sampled by dividing it into 5 parts in the CD direction of the nonwoven fabric, 20 diameters of each fiber were measured with a Keyence microscope VHX-700F, and the average value was calculated.

2. Weight per unit (g / m ² )
In accordance with JIS-L1906, five test pieces of MD direction 20 cm × CD direction 5 cm were sampled so that the sampling positions were uniform in the CD direction of the nonwoven fabric, the mass was measured, and the average value was taken as the weight per unit area. The weight per unit area was calculated as a basis weight (g / m ² ).

3. Tensile strength (N / 5cm), tensile elongation (%), toughness index In accordance with JIS L-1906, the specimens in the CD direction 5cm and MD direction 20cm are collected in the CD direction of the nonwoven fabric so that they are uniform in the CD direction. Five samples were collected so as to be uniform, and measured with a tensile tester at a gripping interval of 10 cm and a tensile speed of 30 cm / min. Samples at five points in the MD direction were measured, and the measured values were averaged to calculate the tensile strength and the tensile elongation. The toughness index is the following formula (1):
Toughness index = tensile strength (N / 5 cm) × tensile elongation (%) / weight per unit area (g / m ² ). . . Formula (1)
Calculated by

4). The average particle size of the carbon dioxide generation inhibitor was measured using a particle size distribution analyzer (NICOMP 380ZLS type manufactured by Particle Sizing System Co.).

5. Dispersibility of carbon dioxide generation inhibitor As a measure of aggregation, the size of the agent particles should be 400 nm or more. Ultra-high resolution field emission scanning electron microscope S-5500 (manufactured by Hitachi High-Technologies Corporation) 20000 in bright field STEM A magnification fiber cross section was observed. The dispersibility was evaluated as “good” if there was no lump having a size of 400 nm or more, and “bad” if it was not.

6). Carbon dioxide generation suppression effect <Preparation of low-temperature pyrolysis product>
Assuming a stoker furnace used in a general municipal incinerator, the carbon dioxide generation suppression nonwoven fabric obtained in each example and a polyolefin nonwoven fabric that does not contain carbon dioxide generation suppression in an atmosphere using a TG / DTA apparatus The treatment was performed under the conditions of gas nitrogen / air, measurement range of 30 to 400 ° C., temperature increase rate of 10 ° C./min, gas flow rate of 200 mL / min to obtain a low temperature pyrolyzate.
<Measurement of Carbon dioxide Generation Suppression Effect of Nonwoven Fabric> According to JIS-K7217, 10 mg of the pyrolyzate prepared above is combusted in air at 800 ° C. for 10 minutes, and the generated carbon dioxide is subjected to thermal conductivity detection. Quantitative measurement was performed with a gas chromatograph equipped with a vacuum vessel. The carbon dioxide reduction effect was calculated from the ratio of the difference between the amount of carbon dioxide generated from the polyolefin nonwoven fabric not containing the carbon dioxide generation amount inhibitor and the amount of carbon dioxide generated from the nonwoven fabric obtained in each example.

[Example 1]
A pure carbon dioxide generation amount inhibitor consisting of sodium aluminosilicate with an average particle diameter of 200 nm is added to a polypropylene resin having an MFR of 60 g / 10 min (measured at a temperature of 230 ° C. and a load of 2.16 kg in accordance with JIS-K7210). It added so that it might become 0.03 weight% with respect to resin. Polypropylene resin added with carbon dioxide generation rate inhibitor is extruded by spunbonding at a single hole discharge rate of 0.88g / min · Hole, spinning temperature of 215 ° C, and this filament group is used with high-speed airflow traction device by air jet And pulled toward the moving collection surface to obtain a nonwoven web having an average single yarn fineness of 2.45 dtex.

Next, the obtained web was passed between a flat roll and an embossing roll (pattern specification: circular with a diameter of 0.425 mm, staggered arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, crimping area ratio 6.3%). The fibers were bonded at a temperature of 140 ° C. and a linear pressure of 35 kgf / cm to obtain a spunbonded nonwoven fabric having a basis weight of 20 g / m ² .

[Example 2]
In the same manner as in Example 1, the average single yarn fineness was 2.45 dtex, and the basis weight was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.09% by weight. Spunbond nonwoven fabric was obtained.

Example 3
An average single yarn fineness of 2.00 dtex and a basis weight of 20 g / m ² was carried out in the same manner as in Example 1 so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.15 wt% in a pure content. Spunbond nonwoven fabric was obtained.

Example 4
In the same manner as in Example 1, the average single yarn fineness was 2.45 dtex, and the basis weight was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.30% by weight. Spunbond nonwoven fabric was obtained.

Example 5
The average single yarn fineness is 3.00 dtex and the basis weight is 20 g / m ^{2 in the same} manner as in Example 1 so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm is 0.15% by weight. Spunbond nonwoven fabric was obtained.

Example 6
In the same manner as in Example 1, the average single yarn fineness was 1.40 dtex and the basis weight was 30 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.15 wt% in a pure content. Spunbond nonwoven fabric was obtained.

Example 7
In the same manner as in Example 1, the average single yarn fineness was 0.07 dtex, and the basis weight was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.15% by weight. Spunbond nonwoven fabric was obtained.

Example 8
A nonwoven fabric web having an average single yarn fineness of 2.45 dtex was obtained in the same manner as in Example 1 so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.15 wt% in a pure content. . Next, the obtained nonwoven web was passed between a flat roll and an embossing roll (pattern specification: circular with a diameter of 0.425 mm, staggered arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, crimping area ratio 6.3%). The fibers were bonded at a temperature of 137 ° C. and a linear pressure of 15 kgf / cm to obtain a spunbonded nonwoven fabric having a basis weight of 8 g / m ² .

Example 9
A nonwoven fabric web having an average single yarn fineness of 2.45 dtex was obtained in the same manner as in Example 1 so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.15 wt% in a pure content. . Next, the obtained nonwoven web was passed between a flat roll and an embossing roll (pattern specification: circular with a diameter of 0.425 mm, staggered arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, crimping area ratio 6.3%). The fibers were bonded at a temperature of 143 ° C. and a linear pressure of 15 kgf / cm to obtain a spunbonded nonwoven fabric having a basis weight of 60 g / m ² .

Example 10
A nonwoven fabric web having an average single yarn fineness of 2.45 dtex was obtained in the same manner as in Example 1 so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.15 wt% in a pure content. . Next, the obtained nonwoven web was passed between a flat roll and an embossing roll (pattern specification: circular with a diameter of 0.425 mm, staggered arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, crimping area ratio 6.3%). Then, the fibers were bonded to each other at a temperature of 130 ° C. and a linear pressure of 15 kgf / cm to obtain a spunbonded nonwoven fabric having a basis weight of 20 g / m ² .

Example 11
In the same manner as in Example 1, an average single yarn fineness of 2.45 dtex and a basis weight of 20 g / m ² was used so that the carbon dioxide generation amount inhibitor composed of magnesium oxide having an average particle diameter of 200 nm was 0.10 wt% in a pure content. A spunbond nonwoven fabric was obtained.

Example 12
In the same manner as in Example 1, the average single yarn fineness was 2.45 dtex, and the basis weight was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of barium titanate having an average particle diameter of 200 nm was 0.10% by weight. Spunbond nonwoven fabric was obtained.

Example 13
A carbon dioxide generation inhibitor comprising a high-density polyethylene (HDPE) resin having an MFR of 26 g / 10 min (measured at a temperature of 190 ° C. and a load of 2.16 kg according to JIS-K7210) and consisting of sodium aluminosilicate having an average particle diameter of 200 nm. A spunbonded nonwoven fabric having an average single yarn fineness of 2.45 dtex and a basis weight of 20 g / m ² was obtained in the same manner as in Example 1.

Example 14
In the same manner as in Example 1, an average single yarn fineness of 2.45 dtex and a basis weight of 20 g / m ^{2 was} used so that a carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 150 nm was 0.09 wt% in a pure content. Spunbond nonwoven fabric was obtained.

Example 15
In the same manner as in Example 1, the average single yarn fineness was 2.45 dtex, and the basis weight was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 250 nm was 0.09% by weight. Spunbond nonwoven fabric was obtained.

[Comparative Example 1]
An average single yarn fineness of 2.45 dtex and a weight per unit area of 20 g / m ² were obtained in the same manner as in Example 1 so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 200 nm was 0.02 wt% in a pure content. Spunbond nonwoven fabric was obtained. Table 1 below shows the evaluation results of various properties of the nonwoven fabric obtained in Comparative Example 1 together with the evaluation results of various properties of the nonwoven fabric obtained in Examples 1 to 15. In the carbon dioxide generation amount inhibitor addition amount of 0.02% by weight of Comparative Example 1, the carbon dioxide generation amount reduction effect was a low value of 25%.

[Comparative Example 2]
Using a polypropylene resin having an MFR of 60 g / 10 min (measured at a temperature of 230 ° C. and a load of 2.16 kg in accordance with JIS-K7210), the average single yarn fineness was 2.45 dtex and the basis weight was 20 g / m ^2. Spunbond nonwoven fabric was obtained. In Comparative Example 2, since the carbon dioxide generation amount inhibitor was not added, the suppression effect was not exhibited.

[Comparative Example 3]
In the same manner as in Example 1, the average single yarn fineness was 2.45 dtex and the basis weight was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle size of 200 nm was 0.35 wt% in a pure content. The spunbond nonwoven fabric was obtained, but since the content of the carbon dioxide generation amount inhibitor was too high, there were many yarn breaks during spinning, resulting in a poor quality nonwoven fabric.

[Comparative Example 4]
In the same manner as in Example 1, the average single yarn fineness was 2.45 dtex, and the weight per unit area was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 100 nm was 0.09% by weight. Spunbond nonwoven fabric was obtained. In Comparative Example 4, since the average particle diameter of the carbon dioxide generation amount inhibitor was less than 150 nm, the carbon dioxide generation amount suppression effect was a low value of 33%.

[Comparative Example 5]
In the same manner as in Example 1, the average single yarn fineness was 2.45 dtex, and the basis weight was 20 g / m ² so that the carbon dioxide generation amount inhibitor composed of sodium aluminosilicate having an average particle diameter of 400 nm was 0.09% by weight. Spunbond nonwoven fabric was obtained. In Comparative Example 5, since the average particle diameter of the carbon dioxide generation amount inhibitor exceeded 250 nm, there were many yarn breaks during spinning, and the nonwoven fabric was poor in quality.

  In the nonwoven fabric of the present invention, the carbon dioxide generation amount inhibitor particles are uniformly dispersed in the fibers of the polyolefin resin, so the toughness index is improved, the carbon dioxide generation amount during combustion is suppressed, and the high elongation is Therefore, it has the effect of suppressing process stability during production and breakage at the time of wearing, and can be suitably used as a sanitary material.

Claims (7)

A polyolefin-based spunbonded nonwoven fabric composed of polyolefin-based resin fibers, wherein a carbon dioxide generation amount inhibitor having a particle diameter of 150 nm to 250 nm is dispersed in the polyolefin-based resin, and is 0.03 to 0.30% by weight. The nonwoven fabric , which is contained , and the carbon dioxide generation amount inhibitor is at least one selected from the group consisting of magnesium oxide, aluminosilicate, and titanate compound .   2. The polyolefin-based spunbonded nonwoven fabric according to claim 1, wherein the nonwoven fabric has a tensile strength of 20 to 180 N / 50 mm, a tensile elongation of 20 to 70%, and a toughness index of 40 to 100. 3. The average fineness of the fibers constituting the nonwoven fabric is 0.7～3.0Dtex, and basis weight of the nonwoven fabric is 8~60g / ^{m 2,} a polyolefin spunbonded according to claim 1 or 2 Non-woven fabric.   The polyolefin-based spunbonded nonwoven fabric according to any one of claims 1 to 3, wherein the polyolefin-based resin further contains a dispersion aid. The polyolefin-based spunbonded nonwoven fabric according to claim 4 , wherein the dispersion aid is at least one selected from the group consisting of a fatty acid metal salt, a polymer surfactant, and an amphiphilic lipid. The polyolefin-based spunbonded nonwoven fabric according to any one of claims 1 to 5 , wherein the polyolefin-based resin is polypropylene. A sanitary material comprising the polyolefin-based spunbonded nonwoven fabric according to any one of claims 1 to 6 .