JP4249592B2 - Combustible non-woven fabric and method for producing the same - Google Patents

Description

  The present invention is an easily combustible non-woven fabric having good spinnability and excellent combustibility during incineration, particularly excellent complete combustibility, promoting combustion efficiency of mixed combustible materials, and generating harmful components such as dioxins. The present invention relates to an environment-friendly easily combustible nonwoven fabric that can be suppressed and a method for producing the same.

  In recent years, various new products have appeared due to the improvement of living standards, and the amount of industrial waste and garbage discharged from ordinary households has increased. Of these, incombustible waste is landfilled, but combustible waste is generally incinerated. However, the generation of harmful substances, especially dioxins, generated during the combustion of garbage is an important problem related to restrictions on incineration facilities. This dioxin is thought to be produced by the reaction of benzene and chlorine compounds, which are precursors, due to incomplete combustion during the combustion process. In order to suppress dioxins, there are known a method for controlling combustion conditions so that dioxins are not generated, and a method for decomposing or removing dioxins after they are generated. This is a basic measure. For this purpose, it is necessary to completely burn the waste in order to reduce the generation of benzene and chlorine compounds, which are starting materials for dioxins.

Specifically, a method of directly blowing a particulate metal oxide catalyst having a combustion promoting function into a combustion chamber of an incinerator has been proposed as a method for suppressing the generation of dioxins during waste incineration. However, this method has a problem in that the metal oxide catalyst cannot be dispersed in the interior depending on the form of the dust, and the efficiency is poor. In addition, a method for improving the incineration efficiency of combustible waste at the time of incineration by including a metal oxide catalyst in a plastic film waste bag or a shopping bag has been proposed (see, for example, Patent Documents 1, 2, and 3). However, this method simply adds a metal oxide catalyst to the resin component to form a film. If this method is applied to a nonwoven fabric as it is, yarn breaks occur frequently during fiber spinning, and the fiber cannot be made, producing a nonwoven fabric. There was a problem that could not be done.
In recent years, non-woven fabrics have breathable and fabric-like functions, so hygiene materials such as diapers and napkins, daily life materials such as wet tissue and garbage draining bags, simple medical masks and medical gowns, etc. In various fields, the amount of use as a disposable material has increased remarkably, and these are discarded as garbage every day. Therefore, in order to suppress incomplete combustion at the time of waste incineration, it is required to impart a combustion promoting function to the nonwoven fabric itself to perform efficient combustion at the time of waste incineration. Further, it is advantageous from the viewpoint of combustion efficiency to make the fibers constituting the nonwoven fabric thinner. However, when a metal oxide catalyst having a combustion accelerating function is simply added to a polymer and spun, yarn breakage frequently occurs during spinning as described above, and it has been difficult to spin fibers finely, particularly in the high-speed spinning region.

In addition, the presence of moisture, etc. at the time of incineration of the used absorbent article containing an iron-based combustion accelerator in any part of the absorbent article having a liquid-impermeable back layer and a liquid-retaining absorbent layer There has been proposed a method for preventing the combustion temperature from being lowered due to (for example, Patent Document 4). However, in this case as well, an iron-based combustion accelerator is contained in a resin to form a film, and the problem in the case of spinning a resin to which a combustion accelerator is added to form a nonwoven fabric and a method for solving the problem are as follows. Not proposed.
JP 7-257594 A JP 2002-327119 A JP 2002-363428 A JP 2002-11048 A

  The object of the present invention is to solve the above-mentioned problems of the technology, stably spin fine fibers to maintain the fabric function, suppress the generation of harmful components during incineration, and have excellent combustibility. Another object of the present invention is to provide an easily combustible nonwoven fabric and a method for producing the same.

As a result of intensive studies on the above problems, the present inventors have found that the cause of yarn breakage that occurs when spinning by adding metal oxide particles having a combustion promoting function to the polymer is the particle size of the metal oxide particles. In addition to the thermal decomposition and oxidation that occur when pelletizing as a masterbatch and when the masterbatch is added to extrude the polymer, the polymer is oxidized by the presence of metal oxide particles. In order to prevent this oxidation, the inventors have found that spinning can be stabilized by using a specific antioxidant in combination, and the present invention has been completed.
That is, the invention claimed in the present application is as follows.

(1) A non-woven fabric containing polyolefin fibers having a fineness of 3.3 dtex or less , wherein the polyolefin fibers are composed of metal oxide particles having an active catalytic function for combustion, phenolic, phosphorous and sulfur At least one selected antioxidant, the particle size of the metal oxide particles is 1.5 μm or less, and the content thereof is 0.05 to 5% by weight, and the antioxidant An easily combustible nonwoven fabric characterized in that the content of the agent is 0.1 to 0.5% by weight .
( 2 ) The readily combustible nonwoven fabric according to ( 1 ), wherein the metal oxide particles are aluminum metal oxides and / or iron metal oxides.
( 3 ) The polyolefin fiber is a fiber containing at least one of polyethylene, polypropylene, an ethylene / propylene copolymer and an octene / propylene copolymer, or a composite fiber thereof ( 1) or ( 2 ) The nonflammable nonwoven fabric described in 2 ).
( 4 ) When producing a nonwoven fabric by melt spinning a polyolefin resin component having a fineness of 3.3 dtex or less, the polyolefin resin component has an active catalytic function against combustion , and a metal having a particle diameter of 1.5 μm or less. Melt spinning containing 0.05 to 5% by weight of oxide particles and 0.1 to 0.5% by weight of at least one antioxidant selected from phenol, phosphorus and sulfur , It forms in a nonwoven fabric, The manufacturing method of the easily combustible nonwoven fabric as described in ( 1) characterized by the above-mentioned .

  According to the present invention, since the polyolefin-based fiber constituting the nonwoven fabric contains a specific antioxidant and metal oxides, there is no yarn breakage during spinning, and the nonwoven fabric can be easily produced. It is possible to obtain a flammable nonwoven fabric that can be spun finely and has a fabric function with excellent breathability and flexibility. Furthermore, since this nonwoven fabric has excellent combustion characteristics when incinerated as waste, generation of harmful components such as dioxins can be suppressed. Therefore, the non-flammable nonwoven fabric of the present invention is particularly suitable for sanitary materials such as diapers and napkins, living materials such as wet tissues and garbage draining bags, packaging materials, and disposable materials such as simple masks and medical gowns for medical use. It can be preferably used.

The present invention will be described below.
The easily combustible nonwoven fabric of the present invention comprises at least one kind of oxide selected from the group consisting of metal oxide particles having an active catalytic function for combustion, and phenolic, phosphorus and sulfur based on polyolefin fibers constituting the nonwoven fabric. It is obtained by containing an inhibitor. The content of the antioxidant is set to an amount sufficient to prevent oxidative degradation during the production of the polyolefin fiber by the metal oxide particles, but is preferably 0.05 to 1% by weight.
The polyolefin fiber material used in the present invention is preferably polyethylene, polypropylene, ethylene / propylene copolymer, octene / propylene copolymer, etc., from the viewpoint of hydrophobicity, strength, flexibility, and the like. Or a mixture of two or more of these may be used in combination. The fineness of the fiber is preferably 10 dtex or less, particularly 3.3 dtex or less when flexibility and soft tactile sensation are required as fabrics for sanitary materials, daily life materials, and medical use.

  The form of the fibers constituting the nonwoven fabric is not particularly limited, and may be short fibers or long fibers by so-called carding, paper making method or the like, but continuous filaments are preferably used from the viewpoint of strength and productivity. The nonwoven fabric is preferably made of a continuous filament melt-spun by a spunbond method, for example, and joined to form a nonwoven fabric. For joining the web, a method of joining using an adhesive, a method of joining with a low-melting fiber or a composite fiber, a method of spraying a hot melt binder during web formation, a melt joining method, a needle punch, a water stream, etc. It can be obtained by confounding. In order to increase the strength and flexibility of the nonwoven fabric, it is preferable to join by partial thermocompression bonding. The area ratio of thermocompression bonding during partial thermocompression bonding is preferably 5 to 50% from the viewpoint of strength retention and flexibility. The partial thermocompression bonding can be performed, for example, by an ultrasonic method or through a web between a heated embossing roll and a flat roll, so that, for example, an embossed pattern that is a joint point such as a pinpoint shape or a rectangular shape is formed on the entire surface. A non-woven fabric that is scattered is obtained.

The metal oxide particles used in the present invention have an active catalytic function for combustion, that is, an action of generating active oxygen during combustion to promote combustion. In addition to metal oxide, oxides are formed by heating. Including metal hydroxides. Examples of the metal oxide particles include aluminum metal oxides and iron metal oxides.
Examples of the aluminum-based metal oxide particles include gibbsite (α-Al (OH) ₃ ), vialite (β-Al (OH) ₃ ), boehmite (α-AlO (OH)), diaspore (β-AlO (OH) )), Etc., activated alumina particles, α-alumina, activated alumina, etc., or particles carrying a platinum group element using these as carriers.
In addition, iron-based metal oxide particles include goethite (α-FeOOH) particles, hydrous ferric oxide particles such as lipidoclosite (γ-FeOOH) particles, hematite (α-Fe ₂ O ₃ ) particles, Iron oxide particles such as hemite (γ-Fe ₂ O ₃ ) particles and magnetite (FeO _x · Fe ₂ O ₃ , 0 <x <1) particles are used.
These may be used as a mixture, for example, hydrous ferric oxide particles or iron oxide particles coated with an oxide or hydroxide of aluminum or silicon.

The particle diameter of the metal oxide particles is preferably 1.5 μm or less, more preferably 0.3 μm or less from the viewpoint of spinnability. When the particle diameter exceeds 1.5 μm, the ratio of the particles to the fiber diameter increases, so that yarn breakage is likely to occur, and clogging of the filter medium in the spinneret tends to occur. The addition amount (or content) of the metal oxide particles is preferably in the range of 0.05 to 5% by weight, and is added in the range of 0.1 to 2% by weight from the viewpoint of spinnability and combustion promotion effect. More preferably. When the added concentration exceeds 5% by weight, smoke generation during spinning increases, and yarn breakage is likely to occur due to dirt adhering to the periphery of the polymer discharge portion on the spinneret surface. If it is less than 0.05% by weight, the combustion promoting effect may not be obtained.
As a method for adding the metal oxide particles, the metal oxide particles may be added directly to the resin component before spinning. From the viewpoint of kneadability, for example, the metal oxide particles are previously added to the base polymer at about 45% by weight or less. A master batch prepared by kneading into a pellet is prepared, and a method of adding by adjusting the added concentration of the metal oxide particles in the fiber to a set addition concentration in an extrusion process of spinning is preferable. However, if a low addition amount in the masterbatch is used, a lot of polymer that has undergone thermal history will be mixed in, so yarn breakage is likely to occur due to a decrease in the viscosity of the polymer, and the resulting nonwoven fabric has a high elongation. May decrease.

  The antioxidant used in the present invention has an action of preventing the polymer from being decomposed by heat or oxygen at the time of polymer extrusion or the like and preventing the polymer from being oxidized by metal oxides. The antioxidant is used as a phenolic antioxidant or a peroxide decomposing agent, which is usually used as a radical chain inhibitor, from the viewpoint of oxidation prevention, discoloration prevention or production safety. Sulfur-based or phosphorus-based antioxidants are preferable, and these may be used alone or in combination.

  Examples of the phenolic antioxidant include 2,6-t-butyl-4-methylphenol, n-octadecyl-3- (3 ′, 5′-di-t-butyl-4′-hydroxyphenyl) propionate, Tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane, tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate, 4,4 ' -Butylidenebis- (3-methyl-6-t-butylphenol), triethylene glycol-bis [3- (3-t-butyl-4-hydroxy-5-methylphenyl) propionate], 3,9-bis [2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl] -2,4,8,10- Tetraoxaspiro [5,5] undecane, 4,4-thiobis- (2-tert-butyl-5-methylphenol), 2,2-methylenebis- (6-tert-butyl-methylphenol), 4, 4 ' -Methylenebis- (2,6-di-t-butylphenol), 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, 1, 1,3-tris (5-t-butyl-4-hydroxy-2-methylphenyl) butane, 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) Propionate], isooctyl-3--3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,4-bis (n-octylthio) -6- (4-hydroxy-3,5-di -T Butylanilino) -1,3,5-triazine, 3,5-di-tert-butyl-4-hydroxybenzylphosphonate-diethyl ester, 2,2-thio-diethylenebis [3- (3,5-di- Hydroxyphenyl) propionate], 2,4-bis [(octylthio) methyl] -o-cresol, N, N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydrocinnamamide) , Etc. are used.

Examples of phosphorus antioxidants include trisnonylphenyl phosphite, tris (2,4-di-t-butylphenyl) phosphite, distearyl pentaerythritol diphosphite, and bis (2,4-di-t- Butylphenyl) pentaerythritol phosphite, bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol phosphite, 2,2-methylenebis (4,6-di-t-butylphenyl) octyl phosphite Tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylene-di-phosphonite is used.
Examples of the sulfur-based antioxidant include dilauryl-3,3′-thiodipropionate, dimyristyl-3,3′-thiodipropionate, distearyl-3,3′-thiodipropionate, pentaerythritol tetrakis (3-laurylthiopropionate) and the like are used.

The addition amount (or content) of the antioxidant is preferably 0.05 to 1% by weight, more preferably 0.1% to 0.5% by weight. When the addition amount is less than 0.05% by weight, the effect as an antioxidant is weakened, yarn breakage occurs due to a decrease in the viscosity of the polymer during extrusion spinning, and the strong elongation of the resulting nonwoven fabric tends to decrease. On the other hand, if the amount added exceeds 1% by weight, smoke generation during spinning increases, and yarn breakage due to dirt adhering to the periphery of the polymer discharge portion on the spinneret surface tends to occur. The antioxidant may be added immediately after polymerization of the polymer or during pelletization, or may be added when a metal oxide is added to form a master batch.
In addition, other additives such as light stabilizers, lubricants, colorants, antistatic agents can be used in combination as long as they do not reduce the active catalyst function of the metal oxides as necessary, and post-processing of the nonwoven fabric It is also possible to apply a penetrant or the like.

The easily combustible nonwoven fabric of the present invention is dehydrated by heating, for example, when it is thrown away after being used as a disposable product and incinerated in a waste incinerator or the like, in which the metal oxide particles contained in the nonwoven fabric are heated. The active catalyst function is exhibited by causing a reaction or the like to spontaneously generate active oxygen. Further, along with the burning of the non-woven fabric, it is possible to promote the burning of other wastes and the like, which leads to the suppression of the generation of dioxins. The amount of heat generated during the burning of the nonwoven fabric increases, and the smaller the amount of benzene generated in the combustion gas or the greater the amount of carbon dioxide generated, the better the combustion efficiency, indicating that the nonwoven fabric is easily combustible.
The non-combustibility of the non-woven fabric is, for example, by thermally decomposing 5 mg of the non-combustible non-woven fabric using a thermogravimetric analyzer TG (manufactured by Seiko Denshi Kogyo Co., Ltd.) at an air supply rate of 250 ml / min and a heating rate of 10 ° C./min. It can be evaluated by measuring the heat generation amount or the heat generation temperature from the heat generation to the end of heat generation and comparing it with the case of the non-added nonwoven fabric. In this method, when the flammable nonwoven fabric is 200 μV · s / mg or more higher in calorific value than the non-added nonwoven fabric, or the exothermic end temperature at the exothermic temperature is 15 ° C. or higher higher than that of the additive-free nonwoven fabric. Can be evaluated to be effective in promoting combustion.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these.
In addition, the nonwoven fabric in an example was manufactured by the spunbond method, and the measurement and evaluation of the characteristic of the obtained nonwoven fabric were performed as follows. The evaluation of the effect of suppressing the oxidation and decomposition of the polymer was made by comparing the number of yarn breakage during spinning and the strong elongation of the nonwoven fabric. The combustion promotion effect was evaluated by comparing the calorific value during combustion, the carbon dioxide generation ratio and the benzene generation ratio in the gas generated during combustion.
1) Measurement of the number of yarn breaks during spinning Using a spinneret with a number of holes of 68H and a diameter of 0.25mm, the yarn was discharged at a spinning temperature of 230 ° C, 0.9g / min per hole, and pulled at a spinning speed of 3300m / min. The yarn to be checked was visually observed for 5 minutes, and the number of yarn breaks was measured. It can be said that the smaller the number of yarn breaks, the more suppressed the oxidation and decomposition of the polymer.
2) Measurement of strong elongation of nonwoven fabric Tensileon manufactured by Shimadzu Corporation was used to test a specimen having a width of 3 cm and a length of 20 cm at a grip width of 100 mm and a test speed of 300 mm / min. The elongation was measured. It can be said that the smaller the decrease in the strength and elongation of the nonwoven fabric, the more the oxidation and decomposition of the polymer are suppressed.
3) Measurement of calorific value during thermal decomposition of nonwoven fabric 5 mg of the obtained nonwoven fabric was pyrolyzed with a thermogravimetric analyzer TG (manufactured by Seiko Denshi Kogyo Co., Ltd.) at an air supply rate of 250 ml / min and a heating rate of 10 ° C / min. The amount of heat generated from the start of heat generation to the end of heat generation was read. It can be said that as the calorific value increases, it is heated and combustion is promoted.
4) Measurement of carbon dioxide gas and benzene gas generation ratio in combustion gas of nonwoven fabric 35 mg of the obtained nonwoven fabric was put in a quartz tube and burned at 700 ° C. for 4 minutes under an oxygen supply rate of 200 ml / min. The carbon dioxide generation ratio and the benzene generation ratio were measured by gas chromatography. As the carbon dioxide generation ratio in the combustion gas increases, complete combustion is promoted, and the benzene generation ratio of the starting material of dioxins decreases, and the generation of dioxins is considered to be suppressed.

[Example 1]
Phenolic antioxidant Irganox 1330 (Ciba Geigy Corp .: 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene) 0.08 wt% And 0.1 wt% of a phosphorus-based antioxidant Irgafos 168 (manufactured by Ciba-Geigy: Tris (2,4-di-t-butylphenyl) phosphite) during pelletizing (Table 1 of JIS-K7210) MFR = 40) measured under the conditions, and a master batch in which metal oxide particles (goetite (α-FeOOH) particles having a particle diameter of 0.24 μm) were added in advance at 30 wt% with respect to the raw material. Melt spinning was performed while adding 3.3 wt%. In this melt spinning, a spinneret having a spinning hole number of 2000H and a spinning diameter of 0.25 mm was discharged at a spinning temperature of 230 ° C. and 0.9 g / min per hole, and the polymer discharged at a spinning speed of 3300 m / min was used as the spinneret. While cooling from the side in the vicinity, it was picked up by a traction take-up device such as an air soccer. The yarn exiting the tow-pull device was collected as a web on a moving wire mesh conveyor. This web is conveyed and passed between pin pattern embossing / flat rolls having a partial thermocompression area ratio of 7% heated to 135 ° C., and partially thermocompression bonded, with an addition concentration of metal oxide particles of 1.0 wt% and a fineness of 2. A nonwoven fabric having 8 dtex and a basis weight of 20 g / m ² was obtained.
There was no yarn breakage during spinning, and no decrease in the strength and elongation of the nonwoven fabric was observed. The calorific value at the time of thermal decomposition in the TG measurement of the obtained non-woven fabric was higher than that of the fiber without addition of metal oxide particles. In addition, when the nonwoven fabric is burned and the carbon dioxide generation ratio in the combustion gas is measured, it increases from the nonwoven fabric without the addition of metal oxide particles, and the benzene generation ratio decreases, confirming that it is an easily combustible nonwoven fabric. It was done. These results are shown in Table 1.

[Example 2]
Phenolic antioxidant Irganox 1010 (manufactured by Ciba-Geigy: Tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane) 0.1 wt% and phosphorus antioxidant Polypropylene (Table of JIS-K7210) with 0.15 wt% of P-EPQ (Sand Corp .: tetrakis (2,4-di-t-butylphenyl) -4,4′-biphenylene-di-phosphonite) added during pelletization A non-woven fabric having an addition concentration of metal oxide particles of 1.0 wt%, a fineness of 2.8 dtex, and a basis weight of 20 g / m ² is obtained in the same manner as in Example 1 except that MFR = 40) measured under the conditions of 1 is used as a raw material. Obtained.
There was no yarn breakage during spinning, and no decrease in the strength and elongation of the nonwoven fabric was observed. The calorific value at the time of thermal decomposition in the TG measurement of the obtained non-woven fabric was higher than that of the fiber without addition of metal oxide particles. In addition, when the nonwoven fabric is burned and the carbon dioxide generation ratio in the combustion gas is measured, it increases from the nonwoven fabric without the addition of metal oxide particles, and the benzene generation ratio decreases, confirming that it is an easily combustible nonwoven fabric. It was done. These results are shown in Table 1.

[Example 3]
Phenolic antioxidant Irganox 1330 (Ciba Geigy Corp .: 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene) 0.20 wt% And 0.15 wt% of phosphorus-based antioxidant Irgafos 168 (manufactured by Ciba-Geigy: Tris (2,4-di-t-butylphenyl) phosphite) during pelletizing (Table 1 of JIS-K7210) MFR = 40) measured under the conditions was melt-spun while adding 2 wt% of a master batch in which 15 wt% of metal oxide particles (active alumina having a particle diameter of 0.9 μm) was previously added to the raw material. Except for the above, in the same manner as in Example 1, a non-woven fabric having an addition concentration of metal oxide particles of 0.3 wt%, a fineness of 2.8 dtex, and a basis weight of 20 g / m ² I got a cloth.
There was no yarn breakage during spinning, and no decrease in the strength and elongation of the nonwoven fabric was observed. The calorific value at the time of thermal decomposition in the TG measurement of the obtained non-woven fabric was higher than that of the fiber without addition of metal oxide particles. In addition, when the nonwoven fabric was burned and the carbon dioxide generation ratio in the combustion gas was measured, it increased from the nonwoven fabric without the addition of metal oxide particles, the benzene generation ratio decreased, and it was confirmed that the nonwoven fabric was easily combustible. It was. These results are shown in Table 1.

[Example 4]
Phenolic antioxidant Irganox 1330 (Ciba Geigy Corp .: 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene) 0.08 wt% And 0.1 wt% of a phosphorus-based antioxidant Irgafos 168 (manufactured by Ciba-Geigy: Tris (2,4-di-t-butylphenyl) phosphite) during pelletizing (Table 1 of JIS-K7210) MFR = 40) measured under the conditions was melt-spun while adding 2 wt% of a master batch in which 15 wt% of metal oxide particles (active alumina having a particle diameter of 0.9 μm) was previously added to the raw material. Except for the above, in the same manner as in Example 1, a non-woven fabric having an additive concentration of metal oxide particles of 0.3 wt%, a fineness of 2.8 dtex, and a basis weight of 20 g / m ² Got.
There was no yarn breakage during spinning, and no decrease in the strength and elongation of the nonwoven fabric was observed. The calorific value at the time of thermal decomposition in the TG measurement of the obtained non-woven fabric was higher than that of the fiber without addition of metal oxide particles. In addition, when the nonwoven fabric was burned and the carbon dioxide generation ratio in the combustion gas was measured, it increased from the nonwoven fabric without the addition of metal oxide particles, the benzene generation ratio decreased, and it was confirmed that the nonwoven fabric was easily combustible. It was. These results are shown in Table 1.

[Comparative Example 1]
As a result of melt spinning in the same manner as in Example 1 except that polypropylene (MFR = 40 measured under the conditions of Table 1 of JIS-K7210) without addition of an antioxidant was used as a raw material, the number of yarn breaks during spinning was 81. Times / 5 minutes, and it was very difficult to obtain a nonwoven fabric, and no nonwoven fabric was obtained.

[Comparative Example 2]
Phenolic antioxidant Irganox 1330 (Ciba Geigy Co., Ltd .: 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene) 0.01 wt% In addition, the phosphorus-based antioxidant Irgafos 168 (manufactured by Ciba-Geigy: Tris (2,4-di-t-butylphenyl) phosphite) 0.02% was added during pelletizing under the conditions shown in Table 1 of JIS-K7210. Except that the measured MFR = 40) was used as a raw material, a nonwoven fabric having an addition concentration of metal oxide particles of 1.0 wt%, a fineness of 2.8 dtex, and a basis weight of 20 g / m ² was obtained in the same manner as in Example 1.
The number of yarn breakage during spinning was 36/5 minutes, and it was difficult to obtain a nonwoven fabric. Although the calorific value at the time of thermal decomposition in the TG measurement of the obtained non-woven fabric showed a higher value than that of the fiber without addition of metal oxide particles, the strength and elongation of the non-woven fabric decreased.

[Comparative Example 3]
Phenolic antioxidant Irganox 1330 (Ciba Geigy Corp .: 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene) 0.08 wt% In addition, the phosphorus-based antioxidant Irgafos 168 (manufactured by Ciba-Geigy: Tris (2,4-di-t-butylphenyl) phosphite) 0.1 wt% was added during pelletizing under the conditions shown in Table 1 of JIS-K7210. A non-woven fabric having a fineness of 2.8 dtex and a basis weight of 20 g / m ² was obtained in the same manner as in Example 1 except that the measured MFR = 40) was used as a raw material and no metal oxide particles were added.
There was no yarn breakage during spinning, and no decrease in the strength and elongation of the obtained nonwoven fabric was observed, but the calorific value during pyrolysis in the TG measurement was higher than that of the fiber added with metal oxide particles. Even when the nonwoven fabric was burned, the carbon dioxide generation ratio in the combustion gas did not increase as when the metal oxide particles were added, and the benzene generation ratio did not decrease.

The easily combustible non-woven fabric of the present invention has good spinnability and excellent combustibility during incineration, so as a disposable material, it includes sanitary materials such as diapers and napkins, as well as living materials such as wet tissue and garbage draining bags. Can be suitably used in various fields such as medical simple masks and medical gowns, and can suppress the generation of harmful components such as dioxins during combustion in an incinerator after use. .

Claims (4)

Nonwoven fabric containing polyolefin fibers having a fineness of 3.3 dtex or less , wherein the polyolefin fibers are selected from metal oxide particles having an active catalytic function for combustion, phenolic, phosphorous and sulfur At least one kind of antioxidant , the particle size of the metal oxide particles is 1.5 μm or less, and the content thereof is 0.05 to 5% by weight, and the content of the antioxidant An easily combustible nonwoven fabric characterized in that the amount is 0.1 to 0.5% by weight . The easily combustible nonwoven fabric according to claim 1 , wherein the metal oxide particles are aluminum metal oxides and / or iron metal oxides. 3. The fiber according to claim 1 , wherein the polyolefin-based fiber is a fiber containing at least one of polyethylene, polypropylene, an ethylene / propylene copolymer, and an octene / propylene copolymer, or a composite fiber thereof. Easy-to-burn non-woven fabric. When producing a nonwoven fabric by melt spinning a polyolefin resin component having a fineness of 3.3 dtex or less, the polyolefin resin component has a metal oxide having a particle diameter of 1.5 μm or less and having an active catalytic function against combustion. Formed into a nonwoven fabric by melt spinning containing 0.05 to 5% by weight of particles and 0.1 to 0.5% by weight of at least one antioxidant selected from phenol, phosphorus and sulfur. manufacturing method of the easy flammability nonwoven fabric according to claim 1, characterized in that.