JP2001275909A - Wiper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonwoven wiper capable of bringing about an excellent cleaning effect under both of dry and wet cleaning conditions, scarcely weakening the cleaning effect even when there are recessed and projected portions on the surface to be cleaned and hardly needing the addition of a surfactant for imparting a hydrophilic property. SOLUTION: The wiper is formed out of nonwoven fabric, which is composed of ultrathin fibers having a fineness of 1.1×10-5 to 1.1×10-1 g/km and crimped fibers. The ultrathin fibers are impregnated with at least one kind of fluorine base surfactant, the molecule of which contains at least one kind of polyoxyalkylene group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper, and more particularly, to a wiper using a nonwoven fabric which has excellent hydrophilicity and can maintain the hydrophilicity for a long time. The wiper of the present invention has excellent followability of irregularities and can exhibit excellent cleaning properties under both use conditions of dry and wet.
It can be used advantageously when cleaning the floor (floor) in various facilities such as schools, halls, hotels and restaurants. In addition, such a wiper is also called a wiping cloth, a waste cloth, or the like.

[0002]

2. Description of the Related Art As is well known, various types of wipers using a nonwoven fabric are currently commercially available. Commercially available wipers are classified, for example, according to the amount and degree of removal of dirt to be removed by the method. (1) Heavy-duty wipers for wiping a large amount of dirt such as oil, such as cloth waste, and (2) medium-sized wipers. There are middle-duty wipers for wiping dirt, such as table towels, and (3) light-duty wipers, such as lens cleaners, for completely wiping small and fine dirt. Also, when classifying such wipers from the viewpoint of application,
There are household, commercial, industrial, and hospital wipers. For example, heavy duty wipers are widely used in facilities where a large amount of dirt is generated. For example, heavy duty wipers are used for cleaning floors in factories where a large amount of oil stains are generated from machinery and in schools, halls, hotels, restaurants and the like where traffic is intense. .

More specifically, Japanese Patent Application Laid-Open No.
Japanese Patent No. 30498 discloses an embossed cloth particularly suitable for use as a dusting cloth or as a dust mop cleaning element, and which is obtained by crimping ultra-thin fibers (such as polypropylene) into ultra-fine fibers such as polypropylene by a melt blow method. For example, a cloth characterized by including polyethylene terephthalate) is disclosed. This cloth can effectively perform the intended purpose of dusting at the time of dry cleaning conditions where the floor is not wet, but when it is soaked or when water droplets are scattered, In the case of wet cleaning conditions, there is a problem that the dusting effect is significantly reduced because the ultrafine fibers as the main component are made of a material having poor water absorption.

Attempts have been made to obtain a satisfactory dusting effect even under wet cleaning conditions. For example, Japanese Patent Publication No. 60-47845 discloses a wetting agent (hydrocarbon surfactant) selected from the group consisting of dioctyl ester of sodium sulfosuccinate and isooctylphenylpolyethoxyethanol in order to impart hydrophilicity. )
And oil and water rags produced by meltblowing from polypropylene fibers having an average diameter of 10 μm or less. However, the addition of a hydrocarbon surfactant as described above requires the addition of a large amount of a surfactant in order to obtain satisfactory hydrophilicity, and there is no room for improvement in terms of cost and environmental protection. There is.

Japanese Patent Application Laid-Open No. 63-213350 discloses that a hydrocarbon-based surfactant is mixed in advance in a raw material of a dry nonwoven fabric in order to exhibit enhanced hydrophilicity with a minimum necessary amount. And a method for producing a hydrophilic nonwoven fabric, comprising heating the dry nonwoven fabric at a temperature of 70 to 140 ° C. for at least 30 seconds or more after forming the dry nonwoven fabric. However, in the case of this method, it is necessary to install a heating means such as a heating roll, an infrared heater, or an air oven for heating the dry nonwoven fabric, which is disadvantageous in both workability and cost.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and can exhibit an excellent cleaning effect under both dry and wet cleaning conditions. It is an object of the present invention to provide a wiper made of a non-woven fabric, in which even if the surface to be cleaned has irregularities or the like, the cleaning effect is little reduced and the amount of surfactant added for imparting hydrophilicity can be reduced.

[0007]

According to the present invention, there is provided a wiper comprising a non-woven fabric, wherein the non-woven fabric comprises 1.1 × 10 ^{-5 to} 1.1 × 10 ^-1. g
/ Km of fine fibers having a fineness (thickness) and crimped fibers.
A wiper is provided, which is impregnated with one or more fluorine-based surfactants containing at least one polyoxyalkylene group in the molecule.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Although the wiper according to the present invention can be embodied in various forms, some preferred embodiments will be described below. It should be understood that the present invention is not limited to these embodiments. The wiper of the present invention is formed from a nonwoven fabric, like a conventional nonwoven wiper. However, the nonwoven fabric constituting the wiper of the present invention is characterized by being formed from ultrafine fibers and crimped fibers. Non-woven fabric made of such two kinds of different fibers,
Although it can be produced using various techniques generally used in the production of nonwoven fabrics, for example, a spun bond method, a flash method, a melt blow method, etc., in the case of the present invention, it is produced using a melt blow method. Is preferred.

The melt blow method is generally described as follows.
A web of self-adhesive microfibers (microfibers) is produced by blowing a molten thermoplastic resin from a die of an extruder onto a collecting screen with a high-speed airflow and entangled. More specifically, the melt blow method can be generally performed in the following series of steps. The following steps are for manufacturing a nonwoven fabric consisting of only ultrafine fibers containing no fluorine-based surfactant by a melt blow method, and when manufacturing the wiper of the present invention, as described below. , It is necessary to make some changes. Supply of raw resin: Pellets, chips, and bead-shaped raw resin are supplied to a hopper of an extruder. As the extruder, a screw extruder, a barrel extruder, or the like can be used. Melting and extrusion of resin: The raw resin supplied to the hopper is guided to an extruder, melted and extruded. When dust is contained in the thus obtained molten resin, filtration is performed. Fiber formation by spinning: After kneading the molten resin with a kneader or the like, spinning is performed with a spin head. The molten resin is discharged from the spinning nozzle, and the filamentous molten resin is flow-deformed and entangled by a high-temperature, high-pressure airflow that is jetted at high speed from both sides of the spinning nozzle to form microfibers. In this way, ultrafine fibers are obtained. Formation of web: After the obtained ultrafine fibers are cooled and solidified, they are collected in the form of a web on a collector. The collector is
For example, it may be a wire mesh embossed belt equipped with a suction fan. At this stage, the web is preferably subjected to embossing. Gluing and winding: Web calendering, ultrasonic bonding, etc. are performed. Thereby, the strength of the obtained nonwoven fabric can be increased and the smoothness of the surface can be improved.

Since the nonwoven fabric used in the wiper of the present invention is formed from ultrafine fibers and crimped fibers, these two types of fibers can be used at any stage of the manufacturing process as described above. Need to be combined. According to the findings of the present inventor, it is advantageous to mix crimped fibers into the ultrafine fibers after spinning the ultrafine fibers during the production of the nonwoven fabric from the ultrafine fibers by the melt blow method.

The ultrafine fibers are 1.1 × 10 ^-5 to 1.0.
Preferably, it has a fineness of 1 × 10 ⁻¹ g / km. Furthermore, it is essential that the ultrafine fibers are impregnated with one or more fluorine-based surfactants containing at least one polyoxyalkylene group in the molecule. Is preferably performed at a stage until the ultrafine fibers are spun by a melt blow method. Incidentally, although the fluorine-based surfactant may be impregnated alone, as described below,
It is preferable to impregnate in the form of a mixture in combination with a hydrocarbon-based surfactant.

The outline of the nonwoven fabric wiper of the present invention and the production thereof have been described above. Subsequently, each of the wiper and its manufacture will be described in detail. In the manufacture of the nonwoven wipers of the present invention, the microfibers used as one starting material can be basically formed from fiber-forming thermoplastics customary in the art. Suitable thermoplastic resins are not limited to those listed below, for example, polyethylene, polypropylene, polyolefins such as polybutylene, polyethylene terephthalate, polyesters such as polybutylene terephthalate, 6-nylon, 6, Examples thereof include polyamides such as 6-nylon, and elastomers such as polyurethane elastomer, polyolefin elastomer, polyester elastomer, and polyamide elastomer. Among such various thermoplastic resins, polypropylene is particularly useful.

[0013] From polypropylene and other raw material resins,
By the above-described series of steps (melting, extrusion, and spinning of the resin), the desired ultrafine fiber can be produced. The obtained ultrafine fibers, for example, can adsorb fine dust such as dust on the fiber surface and between fibers, and can effectively and largely adsorb dirty water and oil by capillary action. Can be played. Although the fineness of such ultrafine fibers can be changed in a wide range, it is preferably 1.1 × 10
^{-5 to} 1.1 × 10 ^-1 g / km (0.0001 to ¹ denier). Fineness of ultrafine fiber is 1.1 × 10 ^-5 g
/ Km, the yarn tends to be easily broken and the durability tends to deteriorate. On the other hand, if it exceeds 1.1 × 10 ^-1 g / km, the gap between the fibers becomes too large, and fine dust is removed. There is a problem that the desired capillary action cannot be obtained due to the inability to adsorb.

According to the present invention, it is preferable to add a fluorinated surfactant to the ultrafine fiber before the fiber is spun. The timing of adding the fluorine-based surfactant is preferably at the stage of the raw material resin. That is, at the stage of the raw material resin, a fluorine-based surfactant is previously added (preferably, kneaded) to prepare a raw material resin containing a surfactant. In addition, this raw material resin is especially called "master batch" in the present invention.

[0015] The fluorine-based surfactant useful for the production of a masterbatch is preferably a compound represented by the following formula (I). (R _f -Q) _n -Z (I) In the above formula, R _f represents a fluoroaliphatic group having at least 4 completely fluorine-substituted carbon atoms.
This fluoroaliphatic group may be straight-chain or branched, or it may be cyclic if it is sufficiently large, and if necessary, such a group. May be combined. To further illustrate, the fluoroaliphatic group most preferably has about 6 to 12 carbon atoms, in other words, the fluoroaliphatic group contains about 40 to 78% by weight of fluorine. Most preferred. Terminal portion of such fluoro aliphatic group contains at least four fully fluorinated carbon atoms, e.g., _{CF 3 CF 2 CF 2 CF 2} - have a preferred.

Q is a linking group, preferably a polyvalent, generally divalent linking group or a covalent bond. The linking group is a heteroatom-containing group, such as -S
-, - O -, - CO -, - SO 2 - , etc., or it can include combinations of such groups. Z is a nonionic water-solubilizing group containing a poly (oxyalkylene) group (OR ′) _x , wherein R ′ is an alkylene group having 2 to 4 carbon atoms, for example, ethylene And x represents an integer of 6 to 20.

Further, n is an integer of 1 to 6. Details of such a fluorinated surfactant are described in, for example, US Pat. No. 5,300,357. If necessary, see the related description. Particularly useful fluorosurfactants for the production of masterbatches are not limited to those listed below,
It is a compound of the following formula: _{C 8 F 17 SO 2 N (} CH 3) (CH 2 CH 2 O) 9.5 C 14 H 29 ... (II) C 8 F 17 SO 2 N (CH 3) (CH 2 CH 2 O) 10 ArC 8 H 17 ... (III) In the above formula, Ar represents an aryl group such as a phenyl group and a tolyl group.

The above-mentioned fluorine-containing surfactant is usually impregnated in the ultrafine fibers in an amount of 0.5 to 4.0% by mass based on the total amount of the ultrafine fibers. Is preferred. That is, in the case of the present invention, by adding a very small amount of a fluorine-based surfactant, a remarkable effect of imparting hydrophilicity, which could not be expected by the prior art, can be obtained. In addition, the content of the fluorine-based surfactant is 0.1.
If the amount is less than 5% by mass, the effect of enhancing hydrophilicity does not appear, while if it is more than 4.0% by mass, adverse effects such as a decrease in the properties of the ultrafine fibers may occur.

In the practice of the present invention, a hydrocarbon surfactant can be used together with the above-mentioned fluorine surfactant. Hydrocarbon surfactants useful for use in combination with the fluorinated surfactants in the present invention can be conventional nonionic hydrocarbon-based surfactants. Hydrocarbon surfactants suitable for use in the present invention include, but are not limited to, those listed below, for example, polyoxyethylene alkyl ethers,
Polyoxyethylene alkyl phenyl ether, fatty acid polyethylene glycol and the like. Usually, such a hydrocarbon-based surfactant is preferably used in a range of 0.1 to 4.0% by mass based on the total amount of the surfactant.

It is preferable that the hydrocarbon surfactant is usually added in a state of being mixed with a fluorine hydrocarbon. Further, the timing of adding the surfactant mixture can be at any stage until the ultrafine fiber is spun, similarly to the timing of adding the fluorine-based surfactant described above. That is, the surfactant mixture may be kneaded into a thermoplastic raw material resin and used as a master batch.Otherwise, the thermoplastic raw material resin may be melted by an extruder, and then the resulting melt may be used. The surfactant mixture may be pumped. In this way, by adding a mixture of a fluorine-based surfactant and a hydrocarbon-based surfactant to the raw material resin, in contrast to the conventional technique, a comparison can be made when the hydrocarbon-based surfactant is added alone. Thus, the hydrophilicity can be improved satisfactorily with a smaller amount of addition.

In the present invention, it is preferable that the ultrafine fibers are spun, and the crimped fibers are mixed with the web of the ultrafine fibers during or after forming the web into a web. It is more preferable to mix the crimped fiber after molding. The crimped fiber is
It is crimped in order to give the finally obtained web-like nonwoven fabric a bulkiness, and thus to obtain a higher cleaning ability, in particular, good followability of unevenness to a floor surface or the like. The crimped fiber can have a continuous wave, curl or sawtooth profile over the entire length of the fiber. The crimps may be arranged in a plane,
Otherwise, they may be arranged three-dimensionally. The degree of crimp can be varied in a wide range depending on the degree desired in the wiper of the present invention. The crimped fiber used in the present invention generally preferably has 1/2 or more crimps per 1 cm fiber length, and more preferably 2 or more crimps per 1 cm fiber length. Of crimp.

The crimped fiber can have any length as long as it has the number of crimps as described above, but it is usually measured in a completely stretched state, and has an average length of 2 mm. It preferably has a length of up to 15 cm, more preferably 2 to 10 cm. Further, the fineness of the crimped fiber can be changed in a wide range, but is usually 0.11 to 5.5.
g / km (1 to 50 denier), and more preferably 1.1 to 2.2 g / km (2 to 2 denier).
0 denier).

The crimped fibers as described above are not limited to those listed below. For example, polyolefins such as polypropylene, polyesters such as polyethylene terephthalate, 6-nylon,
Polyamides such as 6,6-nylon, acrylic resin,
It can be formed from rayon, polyacetate, or the like. Such crimped fibers can be separated into individual crimped fibers by opening the web, for example, after preparing the web in a garnet machine or a land weber type web forming machine. . Such crimped fibers are commercially available as crimped staple fibers. According to the findings of the present inventors, particularly, crimped staple fibers derived from polyester are useful. Further, details of the crimped fiber (for example, fineness, number of crimps, crimping ratio, etc.) are also disclosed in JP-A-55-30498. Please refer to.

The non-woven fabric made of ultrafine fibers containing crimped fibers, for example, when the crimped fibers are mixed in the process of spinning the ultrafine fibers and forming the web, the flow of the ultrafine fibers It can be produced by introducing crimped fibers into it. More specifically, the raw resin is melted according to the melt blow method, and the ultrafine fibers are manufactured by blowing off the fibers.At the same time, the crimped fibers are introduced into the flow of the newly blown ultrafine fibers, and the obtained fibers are obtained. Is deposited on a suitable support. According to another method, only a microfiber is spun from a die to form a fiber, and a web of the microfiber is produced by depositing it on a suitable support. Then, the crimped fiber is placed in the web. It can also be manufactured by inserting.

According to the present invention, the fiber space of the obtained nonwoven fabric can be increased by mixing the crimped fibers into the ultrafine fibers, so that dirt (dust, viscous liquid, etc.) can be removed from the inside of the nonwoven fabric. Not only is it easier to enter, but also the bulkiness is increased, so that the ability to follow irregularities on the floor or wall surface is dramatically improved. Improvement of the irregularity tracking function means that dirt can be removed more effectively and quickly.

The nonwoven fabric made of the ultrafine fibers containing the crimped fibers produced as described above according to the present invention may be optionally used to improve properties such as appearance and strength of the nonwoven fabric, if necessary. May be contained.
Suitable additives include, for example, additives for increasing the ability to adsorb dirt, such as hydrocarbon oils, silicone oils, and paraffin wax.

[0027] The nonwoven fabric for a wiper according to the present invention can have various thicknesses depending on its use.
Further, as described below, since the nonwoven fabric is preferably embossed, it is necessary to consider a reduction in the thickness at the time of embossing. Usually, the thickness of the nonwoven fabric is preferably in the range of 1 to 30 mm, and more preferably in the range of 1.5 to 4.5 mm. When the thickness of the nonwoven fabric is less than 1 mm, the ability to follow the unevenness is poor. On the other hand, when the thickness is more than 30 mm, the nonwoven fabric becomes too bulky and difficult to handle.

In order to provide the nonwoven fabric with structural integrity sufficient to provide a long service life, as well as excellent dirt adsorbing ability, sufficient drapability, moderate bulkiness, etc. It is preferred to emboss the nonwoven web to such an extent that the effect is not adversely affected. The embossing of the nonwoven web can be performed using any of the various embossing methods commonly used in the art. For example, a desired embossing pattern can be applied to the web using a conventional heating and pressing method. As another embossing method, for example, a method of rapidly heating a web and then cooling it under pressure to give a desired embossing pattern, an impact sealing method under pressure, an ultrasonic welding method under pressure, a nip roll And a rotary embossing method utilizing the same.

The pattern obtained on the surface of the nonwoven fabric by embossing varies widely depending on the conditions such as the processing method used. Embossed patterns are usually
It is formed by straight or curved embossing lines. Suitable embossing patterns are not limited to those listed below, but include, for example, triangles, diamonds, squares, rectangles, polygons, pears, ellipses, and alphabets (eg, J-shaped). And such an embossed pattern may be continuous or otherwise discontinuous.

FIG. 1 is a plan view showing an example of an embossing pattern applicable to the nonwoven fabric of the present invention. For example, as shown in FIG.
1 may be formed in a diamond shape on the surface of the nonwoven fabric 10. In addition, as shown in FIG.
A linear intersection pattern 11 may be formed on the surface of the zero. Further, as shown in FIG. 1 (C), a J-shaped pattern 11 may be formed on the surface of the nonwoven fabric 10.
Either embossing pattern is useful.

In the wiper of the present invention, when the surface of the nonwoven fabric constituting the wiper is embossed in various patterns, it is possible not only to prevent the surface of the nonwoven fabric from fuzzing but also to improve the appearance (aesthetic appearance) of the obtained wiper. In addition, effects such as improvement, improvement in strength, and prevention of falling off of fibers can be obtained. In addition, the wiper obtained in this manner can quickly absorb dirty water and the like when the non-woven fabric is mainly composed of ultrafine fibers having excellent hydrophilicity, and can be used when the floor is wet with moisture or the like. The cleaning property can be greatly improved. Further, the cleaning property at the time of drying can be remarkably improved as compared with a wiper not using a surfactant.

[0032]

Next, the present invention will be described with reference to examples. It should be understood that the present invention is not limited by the following examples. Example 1 A nonwoven fabric web was manufactured under the manufacturing conditions described in Table 1 below.

[0033] Polypropylene (PP) resin of Meltoidex (MI) 800 (trade name "E" from EXXON)
SCORENE PD3795G) in an extruder, and then a mixture of the following two surfactants was added to the obtained molten resin in an amount of 1.5% by mass based on the total amount of the resin. Was added by the injection method. Fluorinated surfactant (hereinafter referred to as “surfactant A”): C ₈ F ₁₇ SO ₂ N (CH ₃ ) (CH ₂ CH ₂ O)
_9.5 C ₁₄ H ₂₉ hydrocarbon surfactant (hereinafter referred to as “surfactant C”): polyoxyethylene octyl phenyl ether (trade name “Triton X” from Union Carbide)
(Available as 100 ") In the surfactant mixture used here, the weight ratio of surfactant A to surfactant C was 1: 1. PP
After adding a surfactant to the resin, the resulting mixture was spun from a die of an extruder according to a melt blow method, and ultrafine fibers were collected on a conveyor. A nonwoven fabric web made of ultrafine fibers having an average basis weight of 75 g / m ² was obtained. Example 2 A nonwoven fabric web was manufactured according to the method described in Example 1 above. In this example, as shown in Table 1 below, the amount of the surfactant mixture added to the molten resin was increased from 1.5% by mass to 3.0% by mass. A nonwoven fabric web made of ultrafine fibers having an average basis weight of 75 g / m ² was obtained. Example 3 A nonwoven fabric web was manufactured under the manufacturing conditions described in Table 1 below.

The following two types of PP resins were mixed: 92 parts by weight of a PP resin of MI800 (ESCOLINE PD3795G) and 8 parts by weight of a PP resin of MI35 (hereinafter, also referred to as “PP Master”). Here, PP Master is EXXO
A mixture of surfactant A and surfactant C (weight ratio = 1: 1) was previously kneaded with a PP resin available from Company N under the trade name “ESCORENE” series to a concentration of 13.0% by mass. It is inclusive. This mixing step resulted in a masterbatch comprising a mixture of surfactant A and surfactant C in an amount of 1.0% by weight, based on the total amount. The obtained masterbatch was put into an extruder to be melted, spun from a die of the extruder according to a melt blow method, and ultrafine fibers were collected on a conveyor. Average basis weight 7
A 5 g / m ² nonwoven fabric web of ultrafine fibers was obtained. Examples 4 to 6 Nonwoven fabric webs were manufactured according to the method described in Example 3 above. In this example, as shown in Table 1 below, MI80
The mixing ratio of the PP resin of No. 0 to the PP Master resin of MI35 and the amount of the surfactant added to the molten resin were changed. In any of the examples, the average basis weight was 75 g / m 2.
^2. A nonwoven fabric web made of ultrafine fibers was obtained. Example 7 A nonwoven fabric web was manufactured under the manufacturing conditions shown in Table 1 below.

The following two kinds of PP resins were mixed: 77 parts by weight of a PP resin of MI800 (ESCOLINE PD3795G) and 23 parts by weight of a PP resin of MI35 (PP Master resin). Here, a mixture of surfactant A and surfactant C (weight ratio = 1: 1) was added to the PP Master resin.
1) was previously kneaded so as to have a concentration of 13.0% by mass. By this mixing step, 3.
A masterbatch containing a mixture of surfactant A and surfactant C in an amount of 0% by weight was obtained. The obtained master batch was put into an extruder to be melted, and spun from a die of the extruder according to a melt blow method. During the spinning of the ultrafine PP fiber, a crimped polyethylene terephthalate (PET) fiber having a fineness of 0.66 g / km (6 denier) is
Extra fine PP containing crimped PET fiber mixed by mixing so that the weight ratio of extra fine PP fiber and crimped PET fiber is 65:35
The fibers were collected on a conveyor. With an average basis weight of 75 g / m ² ,
As a result, a nonwoven fabric web composed of ultrafine fibers and crimped fibers was obtained. Examples 8 to 10 Nonwoven fabric webs were manufactured according to the method described in the above-mentioned Example 7. In this example, as shown in Table 1 below, crimped PE
The fineness of the T fiber and the weight ratio between the ultrafine PP fiber and the crimped PET fiber were changed. In each example, the average basis weight was 75.
g / m ² of a nonwoven fabric web comprising ultrafine fibers and crimped fibers was obtained. Examples 11 to 14 Nonwoven fabric webs were manufactured according to the methods described in Examples 7 to 10, respectively. In this example, as shown in Table 1 below, although the manufacturing conditions of the nonwoven fabric web were not changed, the final step was made so that the obtained wiper could be used especially as a dust cleaner (dust wipe). Was embossed.

In the embossing, a nonwoven fabric web is placed at about 120 ° C. in a nip of a pair of steel rolls having a diameter of 25 cm (one of the rolls has a convex portion having a J pattern as shown in FIG. 1C). Performed by passing through. The embossing pressure applied between the rolls is about 200kg / c
m ² , the passing speed of the nonwoven web was about 4.5 m / min. A nonwoven web (average weight 75 g / m ² ) having the desired J-shaped embossed pattern was obtained. Examples 15 and 17 Nonwoven fabric webs were manufactured under the manufacturing conditions described in Table 1 below.

The following two types of PP resins were mixed: 77 parts by weight of a MI65 PP resin (available from Chisso Corporation under the trade name “Chissopolypro PS4902”) and 23 parts by weight of a MI35 PP resin (PP Master resin). . Here, a mixture of surfactant A and surfactant C (weight ratio = 1: 1) was added to the PP Master resin.
1) was previously kneaded so as to have a concentration of 13.0% by mass. By this mixing step, 3.
A masterbatch containing a mixture of surfactant A and surfactant C in an amount of 0% by weight was obtained. The obtained master batch was put into an extruder to be melted, and spun from a die of the extruder according to a melt blow method. During the spinning of the ultrafine PP fiber, a crimped polyethylene terephthalate (PET) fiber having a fineness of 0.66 g / km (6 denier) is
Extra fine PP containing crimped PET fiber mixed by mixing so that the weight ratio of extra fine PP fiber and crimped PET fiber is 45:55
The fibers were collected on a conveyor. The nonwoven fabric web of Example 15 consisting of the ultrafine fibers and the crimped fibers was obtained.

Further, in order to produce the nonwoven fabric web of Example 17, embossing of the nonwoven fabric web produced as described above was carried out in accordance with the method described in Examples 11 to 14. A nonwoven web (average weight 75 g / m ² ) having the desired J-shaped embossed pattern was obtained. Examples 16 and 18 A nonwoven fabric web (Example 16) and a nonwoven fabric web with an embossed pattern (Example 18) were produced according to the method described in Examples 15 and 17. In this example, as shown in Table 1 below, the fineness of the crimped PET fiber was changed from 6 denier (0.66 g / km) to 15 denier (9.9 g / km).
km). In Example 18, a nonwoven web (average basis weight: 75 g / m ² ) having a desired J-shaped embossing pattern was obtained. Comparative Example 1 A nonwoven fabric web was manufactured according to the method described in Example 1 above. In this example, for comparison, as shown in Table 1 below, no surfactant was added to the molten resin. A nonwoven fabric web made of ultrafine fibers having an average basis weight of 75 g / m ² was obtained. Comparative Example 2 A nonwoven fabric web was manufactured under the manufacturing conditions described in Table 1 below.

The MI65 PP resin (Chissopro PS4
902) was charged into an extruder and melted, and spun from a die of the extruder according to a melt blow method. During the spinning of the ultrafine PP fiber, crimped PET fiber having a fineness of 9.9 g / km (15 denier) was mixed so that the weight ratio of the ultrafine PP fiber to the crimped PET fiber was 65:35. The ultrafine PP fibers including the crimped PET fibers were collected on a conveyor. As a result, a nonwoven fabric web composed of ultrafine fibers and crimped fibers was obtained.

Then, the obtained nonwoven fabric web was embossed according to the method described in Examples 11 to 14. A nonwoven web (average basis weight 75 g / m ² ) having a J-shaped embossed pattern was obtained. Comparative Examples 3 and 4 Nonwoven fabric webs were manufactured according to the methods described in Examples 1 and 2, respectively. In this example, for comparison, as shown in Table 1 below, surfactant A was used as the surfactant.
And a mixture of surfactant C (weight ratio = 1: 1), a hydrocarbon surfactant, polyoxyethylene octyl phenyl ether (trade name “Hyon” from Henkel)
ic Op-9 ") in the same amount.
A nonwoven fabric web made of ultrafine fibers having an average basis weight of 75 g / m ² was obtained.

[0041]

[Table 1]

[0042]

[Table 2]

Evaluation test of nonwoven web: In order to evaluate the suitability of the nonwoven webs produced in the above Examples and Comparative Examples as a wiper, an evaluation test was performed according to the following procedure. (1) Evaluation of water absorption A nonwoven fabric web was cut into a predetermined size (a circular piece having a diameter of 6 cm) to prepare a test sample, and the water absorption per unit area was measured by the Larose method for 10 seconds and then for 20 seconds. 30 seconds later,
And it measured after 60 seconds. The water absorption measuring device used was a Larose method water absorption measuring device manufactured by Toyobo Engineering Co., Ltd., model number “TL-01”.

FIG. 2 shows Examples 1 and 2 and Comparative Example 1.
5 is a graph in which the water absorption of the nonwoven fabric web obtained in each of Nos. To 4 is plotted as a function of water absorption time (second). As understood from the plotted measurement results, Comparative Example 1 (C1) and Comparative Example 2 (C2) did not contain any surfactant, so that no water absorption could be recognized. Further, in Comparative Example 3 (C3) and Comparative Example 4 (C4), although the surfactant was added in an amount of 1.5% by mass or 3.0% by mass, the surfactant was hydrocarbon-based. Due to the surfactant (polyoxyethylene octyl phenyl ether), no water absorption was exhibited.
In contrast, Example 1 (E1) and Example 2 (E2)
In this example, a mixture of a fluorine-based surfactant and a hydrocarbon-based surfactant (indicated as AC in Table 1) was added as a surfactant, so the surfactant AC was added in an amount of 1.5% by mass. From the stage, water absorption was remarkably exhibited. The improvement in water absorption resulting from the addition of the surfactant AC is much more remarkable than when the hydrocarbon surfactant (polyoxyethylene octylphenyl ether) is added alone.

FIG. 3 is a graph plotting the water absorption of the nonwoven webs obtained in Examples 3 to 6 as a function of the water absorption time (second). As understood from the plotted measurement results, when the nonwoven fabric web was manufactured using the master batch containing the crimped fiber component into which the surfactant AC was kneaded, as in Example 3 (E3), When the activator AC is added in an amount of 1.0% by mass, water absorbency does not develop, but when the amount is increased to 1.5% by mass as in Example 4 (E4), water absorbency develops, and As in Example 5 (E5) and Example 6 (E6), the addition of 2.0% by mass or more exhibited a sufficiently high water absorption.

FIG. 4 shows Examples 7 to 10 and Example 1.
19 is a graph plotting the water absorption of the nonwoven webs obtained in each of Nos. 7 and 18 as a function of water absorption time (seconds). As understood from the measurement results plotted, when a non-woven fabric web was manufactured using a masterbatch containing a microfiber component and a crimped fiber component into which surfactant AC was kneaded, Example 7 (E7 ) To Example 10
(E10), Example 17 (E17) and Example 18 (E
18) Satisfactory water absorption was exhibited. (2) Evaluation of unevenness followability Examples 11 to 14, Examples 17 to 18, and Comparative Example 1
Each of the nonwoven fabric webs (thicknesses are shown in Table 2 below) manufactured in the above steps 2 and 2 was cut into a predetermined size (165 mm × 670 mm) to prepare test samples. On the other hand, in order to create an evaluation object to be cleaned, a vinyl chloride sheet (10 mm thick) having a continuous uneven pattern with a height difference of 2 mm on its entire surface
Was prepared, and test dust (fine dust collected in a factory, etc.) was sprayed on the concave portion of the vinyl sheet. The test sample was attached to a wiper holder (jig), and the sample was moved once in one direction on a polyvinyl chloride sheet on which test dust was sprayed to perform a cleaning operation.

After the completion of the cleaning operation, the external appearance of the test dust remaining in the concave portion of the vinyl chloride sheet was visually observed, and judged in the following three stages. …: Test dust hardly remains. Δ: Test dust is slightly left. X: A large amount of test dust remains.

The results of the judgments obtained for each test sample are shown in Table 2 below. (3) Evaluation of Cleaning Property The cleaning property in dry and wet conditions was evaluated according to the following procedure. Dry cleaning property: A test dust (1 g) similar to that used in the evaluation of unevenness followability was sprayed on a vinyl chloride sheet having a smooth surface. The same test sample as that used in the evaluation of the unevenness followability was attached to a wiper holder, and the sample was moved once in one direction on a vinyl chloride sheet on which test dust was sprayed to perform a cleaning operation.

For each test sample, the following equation was obtained from the amount of test dust A (g) attached to the test sample and the amount of test dust B (g) removed from the vinyl chloride sheet: %) = (A + B) / 1 × 100 The dust removal rate was calculated. The calculation results obtained for each test sample are shown in Table 2 below. Cleanability when wet: Test dust (1 g) and water (10 ml) similar to those used in the evaluation of unevenness followability on a vinyl chloride sheet having a smooth surface
Was sprayed. Attach the same test sample used in the evaluation of unevenness followability to the wiper holder,
The cleaning operation was performed by moving once in one direction on the vinyl chloride sheet on which the test dust and water were sprayed.

After the completion of the cleaning operation, the external appearance of the test dust and water remaining on the upper part of the vinyl chloride sheet was visually observed and judged according to the following three steps. …: Test dust and water hardly remain. Δ: Test dust and water are slightly left. X: A large amount of test dust and water remains.

The results of the judgments obtained for each test sample are shown in Table 2 below.

[0052]

[Table 3]

As can be understood from the evaluation results shown in Table 2, if the nonwoven fabric web does not contain crimped fibers as in the test sample of Comparative Example 1, the thickness (bulk) is small. And the effect of the unevenness followability is reduced. Further, in the case of a test sample which does not contain a surfactant and therefore has no water absorption as in Comparative Example 2, the cleaning property when wet is significantly reduced. In contrast, Examples 11 to 14,
If the sample contains hydrophilic ultrafine fibers and crimped fibers as in the test samples of Examples 17 to 18, it has a thickness (bulk), and is excellent in conformity to irregularities and cleaning property when wet. I have. Further, the cleaning property at the time of drying is superior to the test sample of Comparative Example 2 containing no surfactant.

[0054]

As described above, according to the present invention, an excellent cleaning effect can be achieved under both dry and wet cleaning conditions. And other complex parts,
Although the cleaning effect is not adversely affected, and a surfactant is added for imparting hydrophilicity, in contrast to the conventional wiper, even if the addition amount of the surfactant is small, it is satisfactory. There is provided a wiper made of a nonwoven fabric, which can achieve a desired cleaning effect.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an embossing pattern applicable to the nonwoven fabric of the present invention.

FIG. 2 is a graph plotting the water absorption of the nonwoven webs obtained in Examples 1 and 2 and Comparative Examples 1 to 4 as a function of water absorption time (second).

FIG. 3 is a graph in which the water absorption of the nonwoven fabric webs obtained in Examples 3 to 6 is plotted as a function of water absorption time (second).

FIG. 4 is a graph plotting the water absorption of the nonwoven webs obtained in Examples 7 to 10 and Examples 17 and 18, respectively, as a function of water absorption time (second).

[Explanation of symbols]

 10: Non-woven fabric 11: Embossed pattern

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3B074 AA02 AA08 AB01 CC03 4H003 AA02 AC11 AC21 BA22 DA04 FA21 4L033 AB01 AB02 AB07 AC15 BA14 CA48 4L047 AA14 AA21 AA28 AA29 AB03 AB08 BA05 CA19 CC16 EA05

Claims (6)

[Claims] 1. A wiper made of a non-woven fabric, wherein the non-woven fabric is composed of an ultrafine fiber having a fineness of 1.1 × 10 ^{-5 to} 1.1 × 10 ^-1 g / km and a crimped fiber. And the ultrafine fiber contains at least one poly (oxyalkylene) group in its molecule.
A wiper characterized in that it is impregnated with one or more kinds of fluorine surfactants. 2. The fluorine-based surfactant according to the following formula (I)
A compound represented by the formula: (R _f -Q) _n -Z (I) (wherein R _f represents a fluoroaliphatic group having at least 4 completely fluorine-substituted carbon atoms, Is a linking group and represents a heteroatom-containing group or a combination of such groups, and Z is a nonionic water-solubilizing group including a poly (oxyalkylene) group (OR ′) _x , In the above formula, R ′ represents an alkylene group having 2 to 4 carbon atoms, and x is an integer of 6 to 20 and n is an integer of 1 to 6). The wiper according to claim 1, characterized in that: 3. The fluorine-based surfactant compound has the following formula: C ₈ F ₁₇ SO ₂ N (CH ₃ ) (CH ₂ CH ₂ O) _9.5 C ₁₄ H ₂₉ ... (II) C ₈ F ₁₇ SO _{2 N (CH 3) (CH 2} CH 2 O) 10 ArC 8 H 17 ... (III) ( in the formula, Ar represents an aryl group) wiper according to claim 2, characterized by being represented by. 4. The method according to claim 1, wherein the fluorinated surfactant is impregnated in the ultrafine fibers at a stage before the nonwoven fabric is formed. The described wiper. 5. The method according to claim 1, wherein the fluorine-based surfactant is contained in the ultrafine fibers in an amount of from 0.5 to 4.0 based on the total amount of the ultrafine fibers.
The wiper according to claim 1, wherein the wiper is impregnated in an amount of 0% by mass. 6. The wiper according to claim 1, wherein the ultrafine fibers are contained in an amount of 10 to 90% by mass based on the crimped fibers.