JP2003164408A - Cleaning sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning sheet capable of providing the subject of cleaning with resistance to dirt caused by static, in addition to collecting and removing dust and dirt. <P>SOLUTION: The cleaning sheet comprises a nonwoven fabric impregnated with an aqueous cleaning agent containing an antistatic agent made from an anionic surfactant or a nonionic surfactant, and a thickener made from an anionic thickener or a nonionic thickener. The aqueous cleaning agent has a viscosity of 20 to 30,000 Pas at 25°C. The cleaning sheet is impregnated with the aqueous solution which is released in an amount of 0.004 to 0.04 g/100 cm<SP>2</SP>under a load of 400 g/100 cm<SP>2</SP>and which assumes 100 to 500 wt.% of the nonwoven fabric. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a wet cleaning sheet. The cleaning sheet of the present invention includes, for example, dust on the floor,
It is suitable for use in removing hair, solid dust and stains, and cleaning appliances such as drawers and dashboards, and electric appliances such as televisions, computers and stereos.

[0002]

2. Description of the Related Art Various dry type and wet type cleaning sheets are known. Most of these cleaning sheets aim to improve the performance such as collecting and removing dust and dirt adhering to the cleaning target, and it is sufficient to improve the antifouling property of the cleaning target after cleaning. It was not examined. For example, living products and electric appliances tend to attract dust due to static electricity,
When a conventional cleaning sheet is used, it is not possible to effectively prevent the generation of dirt due to static electricity.

Therefore, an object of the present invention is to provide a cleaning sheet capable of imparting an antifouling property against dirt caused by static electricity to a cleaning object in addition to collecting and removing dust and dirt.

[0004]

The present invention has a basis weight of 40 to 2
A cleaning sheet comprising a non-woven fabric of 00 g / m ² impregnated with an aqueous detergent containing at least an antistatic agent and a thickening agent, wherein the antistatic agent contains at least an alkyl group and a sulfonate group or phosphoric acid group. An anionic surfactant having a base, or polyoxyethylene sorbitan monoalkylate, wherein the thickener, by providing a cleaning sheet comprising an anionic thickener or a nonionic thickener, the above-mentioned purpose It has been achieved.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on its preferred embodiments. The cleaning sheet of the present invention is a nonwoven fabric impregnated with an aqueous detergent. The aqueous detergent contains at least an antistatic agent and a thickener.
A typical example of an antistatic agent used in an aqueous detergent is a surfactant. Among them, cationic surfactants and amphoteric surfactants are widely used as antistatic agents because of their high adsorptivity to substrates. However, other ingredients, such as thickeners, that are added to the aqueous detergent,
Since most of them are anionic, cationic surfactants and amphoteric surfactants are likely to cause aggregation / sedimentation with their components. As a result, it is difficult to obtain good storage stability, which greatly restricts the formulation. The present inventors have found that when an anionic surfactant or a nonionic surfactant is used as an antistatic agent instead of a cationic surfactant or an amphoteric surfactant, a commonly used anionic surfactant is used. The inventors have found that good cleaning properties and antistatic properties as well as storage stability of an aqueous cleaning agent can be achieved even in a system in which the components are blended, and have completed the present invention.

As the anionic surfactant used as the antistatic agent, those having at least an alkyl group and a sulfonate group or a phosphate group are used. As the alkyl group, a linear or branched chain having 6 to 24 carbon atoms, particularly 10 to 18 carbon atoms is preferably used from the viewpoint of antistatic performance. Specific examples of the anionic surfactant include alkyl sulfonates and polyoxyethylene (ethylene oxide addition mole numbers 1 to 30, especially 2 to 20) alkyl ether phosphates. Examples of the salt constituting these anionic surfactants include sodium salt and potassium salt. These anionic surfactants may be used either individually or in combination of two or more.

Examples of the nonionic surfactant used as the antistatic agent include polyoxyethylene sorbitan monoalkylate. In this nonionic surfactant, the number of moles of ethylene oxide added is preferably from 1 to 30, and especially from 2 to 20 from the viewpoint of antistatic performance. For the same reason, the alkyl group has 6 to 6 carbon atoms.
24, especially 10 to 18 straight or branched chains are preferred. This nonionic surfactant may be used alone or in combination of two or more.

The content of the antistatic agent in the aqueous detergent is 0.005 to 2% by weight, particularly 0.0 to 2% by weight in view of the sufficient antistatic ability and the content of the thickener described later.
It is preferably from 1 to 1% by weight.

The aqueous detergent contains a thickener in addition to the above-mentioned antistatic agent. The thickener is the viscosity of the aqueous detergent,
As a result, it is blended for the purpose of adjusting the amount of release of the aqueous detergent from the cleaning sheet. As the thickener, an anionic thickener or a nonionic thickener is used in relation to the ionicity of the antistatic agent described above. By using these thickeners, aggregation with the above-mentioned antistatic agent and sedimentation resulting therefrom are effectively prevented, and the storage stability of the aqueous detergent is improved.

As the anionic thickener, it is preferable to use an acrylic acid / alkyl methacrylate copolymer thickener, a polyacrylic acid thickener or the like. On the other hand, examples of the nonionic thickener include natural polysaccharides, semi-synthetic polymers such as cellulose-based polymers and starch-based polymers, synthetic polymers such as vinyl-based polymers and polyethylene oxide. These thickeners may be used alone or in combination of two or more. In particular, it is preferable to use a polyacrylic acid-based thickener, an acrylic acid / alkyl methacrylate copolymer-based thickener, or a mixture thereof, because they have low stickiness and sliminess.

The blending amount of the thickening agent in the aqueous detergent is 0.01 to 2% by weight, particularly 0.02% in relation to the adjustment of the viscosity of the aqueous detergent and the above-mentioned blending amount of the antistatic agent. ~
It is preferably 1% by weight.

The aqueous detergent contains the antistatic agent and the thickener described above and uses water as a medium. It is preferable that 50 to 99.9% by weight, especially 80 to 99% by weight, of water is mixed in the aqueous detergent from the viewpoint of the finishability of the surface to be cleaned.

Since the above-mentioned antistatic agent is composed of a surfactant, if the surfactant is blended, not only the antistatic property but also the cleaning property is imparted to the aqueous detergent. If necessary, in addition to the surfactant used as the antistatic agent, a surfactant as a detergent may be additionally added. The surfactant used as a detergent does not require antistatic ability. Similarly to the surfactant used as the antistatic agent, the surfactant used as the detergent is preferably anionic or nonionic, and particularly, a nonionic surfactant such as an alkyl glucoside. Preferably there is.

Further, an alkaline agent or a water-soluble solvent may be added to the aqueous detergent, if necessary, in addition to the above components. It is preferable that all of these components to be added to the aqueous detergent be water-soluble, from the viewpoint of finishability after cleaning. Examples of the alkaline agent include hydroxides such as sodium hydroxide, carbonates such as sodium carbonate, alkaline sulfates such as sodium hydrogensulfate, phosphates such as monobasic sodium phosphate, sodium acetate and sodium succinate. Organic alkali metal salt, ammonia, alkanolamine such as mono-, di- or triethanolamine, 2-amino-2
Examples include β-aminoalkanols such as -methyl-1-propanol and morpholine. Examples of the water-soluble solvent include monohydric alcohols such as ethanol, isopropyl alcohol and propanol, polyhydric alcohols such as ethylene glycol and propylene glycol, and derivatives thereof such as ethylene glycol monomethyl ether and propylene glycol monomethyl ether. The alkaline agent may be added to the aqueous detergent in an amount of 0.01 to 1% by weight, particularly 0.05 to 0.5% by weight,
It is preferable in terms of cleanability and feel. From the viewpoint of reducing odor and skin irritation, it is preferable that the water-soluble solvent is contained in the aqueous detergent in an amount of 1 to 50% by weight, particularly 1 to 20% by weight.

Further, if necessary, the aqueous detergent may include a disinfectant, a fragrance, an antifungal agent, a pigment (dye or pigment), a chelating agent,
A wax agent or the like can be included.

The aqueous detergent preferably has a viscosity at 25 ° C. of 20 to 30000 mPa · s, more preferably 100.
To 1000 mPa · s, more preferably 300 to 800
It is mPa · s. By using the aqueous cleaning agent having a viscosity in this range, (1) the amount of the aqueous cleaning agent released to the surface to be cleaned at the initial stage of cleaning is reduced, and the release amount of the aqueous cleaning agent from the beginning to the end of cleaning is reduced. It becomes uniform, (2) cleaning continuity is improved for a large area to be cleaned, and (3) the amount of the aqueous cleaning agent released is low even at the beginning of cleaning, so the friction resistance value of the cleaning sheet against the surface to be cleaned is reduced. However, (4) since the amount of the aqueous cleaning agent released is low even in the initial stage of cleaning, the degree of fiber freedom on the surface of the cleaning sheet is large, and hair and cotton dust are entangled and retained by the fibers. Specifically, if the viscosity of the aqueous cleaning agent is less than 20 mPa · s, it may be difficult to reduce the amount of the aqueous cleaning agent released to the surface to be cleaned at the initial stage of cleaning. If it exceeds 30,000 mPa · s,
It may be difficult to impregnate the non-woven fabric for impregnation with the aqueous detergent. The viscosity is measured using a Brookfield viscometer. The rotor to be used and the rotation speed are appropriately changed depending on the viscosity of the aqueous detergent.

Next, the nonwoven fabric impregnated with the aqueous detergent (hereinafter referred to as impregnating nonwoven fabric) will be described. As the impregnated non-woven fabric, at least the cleaning surface is made of a non-woven fabric composed of fibers having a fiber length of 20 mm or more, particularly 30 to 100 mm, and particularly 35 to 65 mm, so that the cleaning sheet has sufficient surface strength. It is preferable in terms. A non-woven fabric composed of fibers having a fiber length of 20 mm or more does not require that all the constituent fibers have a fiber length of 20 mm or more, and is unavoidably mixed in the raw material of the non-woven fabric and / or in the manufacturing process. It is permissible to include fibers having a fiber length of less than 20 mm. In particular, it is preferable that the cleaning surface of the impregnated nonwoven fabric is made of spunlaced nonwoven fabric. Since the spunlaced nonwoven fabric can exhibit a low fiber entangled state, it has a good texture and good entanglement of hair and cotton dust. The impregnated nonwoven fabric whose cleaning surface is composed of spunlaced nonwoven fabric includes spunlaced nonwoven fabric alone and composite spunlaced nonwoven fabric in which spunlaced nonwoven fabric is laminated and integrated on at least one of the upper and lower surfaces of the core sheet material. Can be mentioned. In particular, it is preferable to use a composite spunlaced nonwoven fabric having a three-layer structure in which spunlaced nonwoven fabrics (hereinafter referred to as outer layers) are laminated and integrated on the upper and lower surfaces of a sheet material (hereinafter referred to as inner layer) serving as a core material. It is preferable in terms of retention and release properties.

The fibers constituting the outer layer in the composite spunlaced nonwoven fabric having a three-layer structure preferably include hydrophilic cellulose fibers and thermoplastic fibers having a low melting point from the viewpoints of cleanability, operability and strength of the nonwoven fabric. . Examples of the hydrophilic cellulose fiber include rayon and cotton fiber. 30% hydrophilic cellulosic fibers per weight of outer layer
It is preferably contained in an amount of up to 98% by weight, particularly 50 to 90% by weight, because stain stains and dirt can be removed efficiently. This is because hydrophilic cellulose fiber dissolves dirt and dust.
This is due to the excellent property of reabsorbing the dispersed waste liquid. On the other hand, the low melting point thermoplastic fiber is used for the purpose of hot embossing the composite spunlaced nonwoven fabric to increase its strength, as described later. As the low melting point thermoplastic fiber, one having a melting point of 200 ° C. or less is preferable, and one having a melting point of 170 ° C. or less is particularly preferable. Specifically, polyethylene-based fibers, polypropylene-based fibers, low-melting-point type polyethylene terephthalate-based fibers, polyvinyl alcohol fibers, and core-sheath fibers having low-melting-point fibers of these fibers as sheath components and high-melting-point fibers as core components, and , Side-by-side fibers of low melting point fibers and high melting point fibers. The low melting point thermoplastic fiber is contained in an amount of 2 to 70% by weight, particularly 10 to 50% by weight, based on the weight of the outer layer, which improves the strength of the composite spunlaced nonwoven fabric after heat embossing,
Further, it is preferable because the operability during cleaning is good.

The basis weight of the outer layer is 8 to 70 g / m ² , particularly 1 in relation to the total basis weight of the composite spunlaced nonwoven fabric.
It is preferably ⁵ to 30 g / m ² . The thickness (thickness of each outer layer) is preferably 0.05 to 5 mm,
0.1 to 2 m from the point of collecting hair and dust and cost
It is more preferable that m is, particularly 0.2 to 1 mm.

On the other hand, various sheet materials such as paper, non-woven fabric, woven fabric, and resin net can be used as the inner layer of the three-layer composite spun lace nonwoven fabric. From the viewpoint of maintaining the strength of the cleaning sheet, these sheet materials preferably have high strength, for example, breaking strength of 200 cN / 25 mm or more. The basis weight of the composite spunlace nonwoven fabric is 10
When the amount is 0 g / m ² or less, an aqueous detergent is retained,
In addition, the inner layer is preferably low in density and bulky from the viewpoint of developing the strength, thickness and cushioning property of the composite spunlaced nonwoven fabric. As a constituent material for the inner layer having such characteristics, for example, a nonwoven fabric such as a thermal bond (air through) nonwoven fabric, a spunlace nonwoven fabric, an airlaid nonwoven fabric, or the like is preferable. The higher the breaking strength, the more preferable, but in reality, the upper limit is about 100 N / 25 mm.

When the inner layer is composed of fibers, hydrophilic fibers such as rayon, cotton, pulp and polyvinyl alcohol fibers can be used as the fibers.
Further, from the viewpoint of increasing the thickness of the inner layer and enhancing the cushioning property, it is also preferable to mainly use the hydrophobic fiber. Examples thereof include polyolefin fibers such as polyethylene and polypropylene, polyester fibers, polyamide fibers such as nylon, polyacrylonitrile fibers, and composite fibers such as core-sheath fibers and side-by-side fibers. It is preferable that these fibers have a three-dimensional crimp from the viewpoint of increasing the thickness of the inner layer and improving the cushioning property. Further, when the uneven portion is formed on the surface of the composite spunlaced nonwoven fabric by heat embossing, heat shrinkable fibers or heat crimpable fibers are used.

The basis weight of the inner layer is preferably ²⁰ to 150 g / m ² , and more preferably 25 to 80 g / m ² in relation to the total basis weight of the composite spunlaced nonwoven fabric. Further, its thickness is preferably 0.2 to 4.8 mm,
From the viewpoint of increasing the thickness and cushioning property and satisfying the cost of not discomforting for disposable use, 0.4 to 3 mm, particularly 0.
It is more preferably 6 to 2 mm.

The composite spunlaced nonwoven fabric composed of the above-mentioned inner layer and outer layer is preferably produced, for example, by the following method. First, a fiber web produced by the card method or the like is superposed on both sides of a sheet material as an inner layer, for example, a thermal bond nonwoven fabric. Then, an entanglement treatment (water needling treatment) using a high-pressure water stream is performed to entangle the fibers of the fiber web to form a spunlace nonwoven fabric constituting an outer layer, and the fiber web is composed of a thermal bond nonwoven fabric. A low-entangled composite spunlaced nonwoven fabric, which is integrated with the inner layer in an entangled state, is manufactured.
The nonwoven fabric thus obtained is a nonwoven fabric-like fiber aggregate (spunlace nonwoven fabric) formed by fiber entanglement of fiber webs on both sides of a thermal bond nonwoven fabric which is a sheet material.
However, together with the entanglement of the constituent fibers, the sheet material is also integrated in an entangled state. Then, if necessary, this is subjected to hot embossing.

As another preferable production method, first, a spunlace nonwoven fabric having a low degree of entanglement and a high degree of fiber freedom, which is an outer layer, is produced. Separately from this, a sheet material as an inner layer is manufactured. The outer layer is arranged on both sides of the inner layer, and heat embossing is performed to integrate the three layers to form a laminated sheet.

Nonwoven fabrics for impregnation including composite spunlace nonwoven fabrics have a basis weight of 40 to 200 g / m ² , preferably 50 to 150 g / m ² , and more preferably 55 to 10 g.
It is 0 g / m ² . Nonwoven fabric for impregnation has a basis weight of 40g
If it is less than / m ² , it becomes difficult to impregnate the amount of the aqueous cleaning agent required to wipe a large area floor. If it exceeds 200 g / m ² , the weight may increase and the operability may deteriorate, and the cost may increase. In addition, the thickness thereof is 0.4 to 5 mm, particularly 0.6 to ² mm under a load of 3 g / cm ² , which is a factor of the retention of the aqueous cleaning agent and the operability and sheet strength of the cleaning sheet. Is preferred.

The non-woven fabric for impregnation preferably has a large number of convex portions and a large number of concave portions that are consolidated by the application of heat and pressure on the surface that contacts the surface to be cleaned during use. As a result, the frictional resistance value between the cleaning sheet and the surface to be cleaned at the time of cleaning is reduced, and the discharge amount of the aqueous cleaning agent can be easily controlled. The area of the convex portion is 30 to 95% of the apparent area of the cleaning surface of the impregnated non-woven fabric, especially 4
It is preferably 0 to 85%, especially 50 to 80% from the viewpoint of controlling the amount of detergent released, collecting hair and cotton dust during cleaning, and the like. The apparent area of the cleaning surface of the impregnating non-woven fabric refers to the area of the cleaning surface of the impregnating non-woven cloth when viewed in plan.

As a method for forming irregularities on the surface of the impregnated nonwoven fabric, (1) hot embossing, (2) heat-crimpable fibrous web or heat-shrinkable fibrous web After the heat-shrinkable fibrous webs are laminated and integrated, a heat treatment is performed to develop undulations. (3) After the heat-shrinkable film and the fibrous web are integrated at a predetermined portion, heat treatment is performed to develop irregularities. (4) A processing method in which the heat-shrinkable net and the fibrous web are integrated by a water jet or the like and then heat-treated to develop irregularities,
(5) A method of manufacturing a spunlaced nonwoven fabric by engraving a pattern of a carrier wire on the nonwoven fabric to create irregularities, and (6) sucking while holding a fiber web on a pattern net to form a pattern of the pattern net. And a method of engraving the fiber web to express irregularities.

The area of the convex portion is measured as follows. That is, a cleaning sheet (10 cm x 10 cm) impregnated with a predetermined amount of an aqueous cleaning agent is spread out into one sheet, and a pen half-practice paper for practice of calligraphy [Kuretake Seibo Co., Ltd.] in which the part wet with water is darkened in black Dosha Co., Ltd., KN37-10]. A 10 cm × 10 cm acrylic plate (25 g) was placed on the cleaning sheet, and a 2000 g weight was further placed thereon, and a load was applied for 60 seconds. After that, the weight and the acrylic plate were quickly removed, and the area of the blackened portion of the half-paper was determined using an image analyzer [New Qube, manufactured by Nexus Co., Ltd.], and this value was taken as the area of the convex portion. . Further, a value obtained by dividing the area of the convex portion by 100 cm ² (apparent area of the cleaning surface of the cleaning sheet) was defined as the area ratio of the convex portion.

As the pattern of the concave portion, a pattern having a continuous linear shape, a curved shape, or both of them may be mentioned. Further, a pattern in which a continuous linear or curved pattern and a discontinuous dot pattern are combined is also preferably used. In particular, a pattern in which continuous linear concave portions intersect with each other to form convex portions closed by the concave portions, for example, a rhombic lattice pattern is preferable from the viewpoint of maintaining the surface strength of the impregnated nonwoven fabric. When the recess is linear or curved, the line width is 0.5 to 3
mm is preferred. Further, the distance between the concave portions is appropriately adjusted according to the characteristics required of the cleaning sheet.

The height difference between the convex and concave portions of the impregnated non-woven fabric is preferably controlled so that the amount of detergent released as described below falls within the range as described below, specifically 0.02-1 mm. In particular, it is preferably 0.04 to 0.7 mm. This height difference can be measured by observing the cross section of the impregnated nonwoven fabric with a microscope or the like.

The nonwoven fabric for impregnation has a breaking strength of 200 c.
N / 25mm or more, especially 300 to 8000cN / 25m
It is preferable that the thickness is m, from the viewpoint of satisfying both the sufficient sheet strength required for cleaning and the entanglement of hair and cotton dust. The breaking strength is sufficient if at least one of the flow direction (MD) and the width direction (CD) of the impregnated nonwoven fabric satisfies the above value.

The cleaning sheet of the present invention is preferably 100 to 500% by weight, more preferably 100 to 350% by weight, and still more preferably 150 to 100% by weight based on the weight of the impregnated nonwoven fabric.
It is impregnated with 300% by weight of an aqueous detergent. Impregnation rate is 1
If the amount is less than 00% by weight, sufficient cleaning performance for stain stains and dust may not be obtained. If the amount exceeds 500% by weight, the amount of the aqueous cleaning agent discharged to the surface to be cleaned becomes too large, and dirt or dust remains on the surface to be cleaned, which further adversely affects some wooden floors. There is. The rate of impregnation of the non-woven fabric for impregnation with the water-based detergent is based on the weight of the non-woven fabric for impregnation after the water-based detergent is impregnated into the non-woven fabric for impregnation as it is or after removing excess water-based detergent by mangle treatment or the like. Measured under no load.

The cleaning sheet is 400 g / 100 cm ^2.
The release amount of the aqueous detergent under load (hereinafter referred to as the detergent release amount) is preferably 0.004 to 0.04 g / 100c
m ² , more preferably 0.005 to 0.03 g / 100
cm ² , more preferably 0.006 to 0.02 g / 10
It is 0 cm ² . Detergent release amount is 0.004 g /
If it is less than 100 cm ² , the stain stain removability may be poor, and if it is more than 0.04 g / 100 cm ² , the operability during cleaning may be poor. In order to keep the amount of detergent released from the cleaning sheet within the above range, for example, the area ratio of the convex portions in the impregnated nonwoven fabric described above, the height difference between the convex portions and the concave portions, the impregnation ratio of the aqueous detergent, the impregnated nonwoven fabric. The degree of hydrophilicity, bulkiness and the like may be controlled.

The cleaning agent discharge amount is measured by the method shown in FIG. That is, the cleaning sheet 1 impregnated with a predetermined amount of the aqueous detergent is cut into a size of 100 × 100 mm without compression. The cleaning sheet 1 is placed on the acrylic plate 2 having a size of 110 × 110 mm. A weight 3 (400 g) having a bottom surface of a size of 100 × 100 mm was placed on the cleaning sheet 1 and left for 1 minute, then the weight 3 and the cleaning sheet 1 were removed, and the weight was discharged onto the acrylic plate 2. Quickly measure the amount of detergent on a balance.

In the cleaning sheet of the present invention, from the viewpoint of effectively entanglement of hair and cotton dust, the degree of freedom of each fiber on the cleaning surface is increased, that is, the cleaning surface is in a low fiber entangled state. Is preferred. The static friction resistance value can be adopted as an index of the fiber entangled state of the cleaning surface in the cleaning sheet of the present invention. The static friction resistance value is measured by the method shown in FIG. That is, a sandpaper (water-resistant paper Techno sander No. 1200 grain size manufactured by 3M) 4 attached to a bottom 10 cm × 10 cm weight (total weight 400 g including sandpaper) 5 is firmly fixed on a horizontal base 6. Further, the surface of the cleaning sheet 1 (200 mm × 280 mm) impregnated with the aqueous cleaning agent is placed so that the sand surface of the sandpaper faces the cleaning sheet. A thread 7 is attached to the side surface of the weight, and the other end of this thread 7 is pulled through a pulley 8 to a tensile tester (R, manufactured by Oriental Co.).
It is attached to the load cell 9 of TM-25). The tensile tester is operated and the weight 5 is moved horizontally at a speed of 500 mm / min for 30 mm, the initial maximum static friction resistance value at that time is measured, and this is used as an index of the fiber entanglement degree of the cleaning surface.
The measurement is performed in the sheet flow direction (MD) and the width direction (CD) in the cleaning sheet manufacturing process. Replace the sandpaper with a new one after each measurement.
On the cleaning surface of the cleaning sheet impregnated with the water-based cleaning agent, as the fibers are in a low entangled state, that is, the higher the degree of freedom of each fiber is, the more the fibers are caught in the sandpaper, the static friction resistance is increased. It is recognized that the values tend to be high.

The static friction resistance value of the cleaning surface, which is an index of the fiber entangled state in the cleaning sheet, is 900 to 2500 cN.
Is preferred. If it is less than 900 cN, it becomes difficult to obtain good entanglement of hair and cotton dust. 25
If it exceeds 00 cN, the surface strength of the sheet may be weakened and the fibers may be caught by burrs on the floor plate, and the operability may be deteriorated. From the viewpoint of achieving both the entanglement of hair and cotton dust and the surface strength of the cleaning sheet, the static friction resistance value is 1100 to 2200 cN, particularly 1200 to 20.
A range of 00 cN is preferred. Cleaning sheet MD and C
It is most preferable that the static friction resistance value is within the above range in any direction of D, but it is sufficient if the static friction resistance value in at least one direction is within the above range.

As shown in FIG. 3, the cleaning sheet of the present invention is attached to the cleaning portion 11 of the cleaning tool 10 having the cleaning portion 11 and the rod-shaped grip 12 connected to the cleaning portion 11. Used. Specifically, the cleaning tool 10 includes a flat cleaning portion 11 to which the cleaning sheet 1 can be attached, and a rod-shaped handle 12 connected to the cleaning portion 11 via a universal joint 13.
The cleaning sheet 1 is configured to be fixed by a plurality of flexible piece portions 14 that are provided in the cleaning portion 11 and that form radial slits.

Further, the cleaning sheet of the present invention is provided with a bonding portion 21 by bonding as shown in FIG.
It may be formed in a flat bag shape having an insertion space inside thereof. The cleaning sheet 1 of this form is used together with the cleaning tool 24 having the handle 23 having the mounting head portion 22 of the cleaning sheet 1 at the tip portion. Specifically, by inserting the head portion 22 of the cleaning tool 24 into the insertion space of the bag-shaped cleaning sheet 1, the cleaning sheet 1 is attached to the head portion 22.

Examples 1 to 6 and Comparative Examples 1 to 3 A low melting point fiber (2.8 dt) having a three-dimensional crimp shape with a core-sheath structure in which a core is made of polypropylene and a sheath is made of polyethylene.
An extruded nonwoven fabric having a basis weight of 27 g / m ² was prepared using ex × 51 mm and a sheath component melting point of 130 ° C.). The fibers were heat-bonded to each other at a temperature of 140 ° C. The breaking strength of this air-through nonwoven fabric is 1790 cN / 25 in the machine direction (MD).
mm, and the width direction (CD) was 240 cN / 25 mm.

On the other hand, rayon fiber (1.7 dtex × 4
0 mm) and acrylic fiber (0.9 dtex x 51 m)
m) and a core-sheath fiber (1.0 dtex × 38 mm) in which the core is made of polypropylene and the sheath is made of polyethylene,
A fibrous web having a basis weight of 19 g / m ² prepared by mixing with a weight ratio of 50/25/25 and prepared by a conventional card machine was laminated on the upper and lower sides of the air-through nonwoven fabric. Next, a water needling treatment was performed under low energy conditions to entangle the air-through nonwoven fabric and the fiber web to produce a composite spunlace nonwoven fabric having a surface layer with a high degree of fiber freedom and having a basis weight of 65 g / m ² . An ultrasonic embossing machine was used to perform embossing on the entire surface of the produced non-woven fabric, which was composed of a rhombic lattice-shaped concavo-convex pattern. The area ratio of the protrusions was 62.5%, and the height difference between the protrusions and recesses was 0.4 mm. The composite spunlace nonwoven fabric has a breaking strength of 31 in the flow direction and 31 in the width direction.
It was 80 cN / 25 mm and 430 cN / 25 mm.

An aqueous detergent having the composition shown in Table 1 was impregnated into the composite spunlace nonwoven fabric at the impregnation rate shown in the table to prepare a cleaning sheet. The friction resistance value of the cleaning sheet measured by the above method is 1115c in the flow direction.
It was N and 1210 cN in the width direction. The cleaning agent release amount of the obtained cleaning sheet was measured by the above-mentioned method, and the hair collection rate, dust collection rate, soy sauce dry stain removability of the 6th tatami mat and The charged voltage was measured. The results are shown in Table 1.

[Hair Collection Rate] A quick cleaning wiper (manufactured by Kao Corporation) was equipped with a cleaning sheet. 30c
Spread 5 hairs of about 10 cm on a floor of mx 60 cm (woody tile MT613T manufactured by Matsushita Electric Works), put a cleaning sheet on it and clean it with a constant stroke (60 cm) for 2 reciprocations to make a cleaning sheet. The number of hairs collected was measured. This operation was repeated 6 times to measure how many hairs out of 30 hairs were collected.
The number of collected hairs was divided by 30, and this was multiplied by 100 to obtain the value as the hair collection rate (%).

[Dust Collection Rate] A quick cleaning wiper (manufactured by Kao Corporation) was equipped with a cleaning sheet. 100
cm × 100 cm flooring (Matsushita Electric Works Woody tile MT613T), 0.1 g of JIS test dust (Kanto loam layer, fine grain) 0.1 g is sprayed (dispersed evenly over the entire surface), and the flooring is reciprocated once. I cleaned 4 rows. After repeating this operation 6 times, the dirty cleaning sheet is dried and the weight (sheet + non-volatile component of cleaning agent + dust) is measured. The sheet weight measured before impregnation and the theoretical non-volatile component weight of cleaning agent remain. Was subtracted to calculate the amount of dust collected. The weight of the collected dust was divided by the total weight of dust scattered (0.6 g = 0.1 g × 6 times), and this was multiplied by 100, and the value was taken as the dust collection rate (%). .

[Removability of 6th tatami mat dry soy sauce] A drop of commercially available soy sauce (0.02m) on a flooring (area: 1 tatami mat)
g) Dropped and dried with a drier. After attaching a cleaning sheet to the quickle wiper (manufactured by Kao Corporation) and continuously cleaning another clean flooring for 5 tatami mats, clean one tatami mat with dried soy sauce stains and remove the following: The evaluation was performed based on the standard. In addition, 5 to clean first
As for the floor of the tatami mat, one stroke is to wipe one back and forth at a distance of about 90 cm.
2 rows in m) and 4 rows in the lateral direction (90 cm) were wiped to clean one tatami mat. The flooring with soy sauce stains was wiped only on the stains, and the relationship between the number of cleanings and the stain removal was evaluated. ◯: Dirt was completely removed by cleaning less than 10 reciprocations. ○ to △: Dirt was completely removed by cleaning 15 times. Δ: Dirt could be completely removed by 20 reciprocating cleanings. Δ to ×: Dirt could be completely removed by 30 reciprocating cleanings. X: Dirt could not be completely removed even after 30 reciprocations.

[Charging voltage] Measurement was carried out in an environment of temperature 20 ° C. and humidity 65% RH. Thickness 30 with peeling treatment on one side
A polyethylene terephthalate (PET) film having a size of 200 μm was cut into a size of 200 × 200 mm, and both sides thereof were wiped with a cleaning sheet for one reciprocation and naturally dried. This P
The side of the release treated surface of the ET film was quickly rubbed on a wooden desk with 10 reciprocating hands. The PET film was gently peeled off from the wooden desk, and the amount of static electricity on the peeled surface was promptly measured using an electrostatic measuring device (MODEL-203, manufactured by Hugle Electronics).

[0046]

[Table 1]

As is clear from the results shown in Table 1, the cleaning sheet (product of the present invention) of each example has a hair collection rate of
It can be seen that it is excellent in both the collection rate of dust and the removability of soy sauce dry soil on the 6th tatami mat. Further, it can be seen that the cleaning sheets of each example have a low electrification voltage and an excellent antistatic effect. On the other hand, the cleaning sheet of Comparative Example 1 is not impregnated with the cleaning agent, and thus is inferior in the removal property of the 6th tatami soy sauce dry stain and the antistatic effect. It can be seen that the cleaning sheet of Comparative Example 2 is excellent in the collection rate of hair, the collection rate of dust and the removability of soy sauce dry stains on the 6th tatami mat, but is inferior in the antistatic effect. In the cleaning sheet of Comparative Example 3, aggregates were generated in the cleaning agent, the compounding stability was low, and the performance could not be evaluated.

[0048]

According to the cleaning sheet of the present invention, in addition to collecting and removing dust and dirt, it is possible to impart an antifouling property to dirt due to static electricity to the object to be cleaned.

[0049]

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a method for measuring a cleaning agent release amount.

FIG. 2 is a schematic diagram showing a method for measuring a frictional resistance value.

FIG. 3 is a perspective view showing a usage pattern of the cleaning sheet of the present invention.

FIG. 4 is a perspective view showing another usage pattern of the cleaning sheet of the present invention.

[Explanation of symbols]

1 cleaning sheet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C11D 1/34 C11D 1/34 1/72 1/72 17/04 17/04 D06M 13/165 D06M 13 / 165 13/248 13/248 13/295 13/295 15/263 15/263 15/53 15/53 F Term (reference) 3B074 AA01 AA02 AB01 BB01 CC03 4H003 AB14 AB39 AC05 AC10 BA22 DA04 DA10 DA15 EB30 EB42 ED02 ED28 ED31 FA21 4L033 AA05 AA10 AB07 AC10 BA14 BA28 BA40 CA18 CA48

Claims (5)

[Claims] 1. A non-woven fabric having a basis weight of 40 to 200 g / m ² ,
A cleaning sheet impregnated with an aqueous detergent containing at least an antistatic agent and a thickener, wherein the antistatic agent contains at least an alkyl group and a sulfonate group or a phosphate group. ,
Alternatively, a cleaning sheet made of polyoxyethylene sorbitan monoalkylate, wherein the thickener is made of an anionic thickener or a nonionic thickener. 2. The viscosity of the aqueous detergent at 25 ° C. is 20.
~ 30000 mPa · s, and the cleaning sheet is
The release amount of the aqueous cleaning agent under a load of 400 g / 100 cm ² is 0.004 to 0.04 g / 100 cm ² , and the aqueous cleaning agent is impregnated with 100 to 500% by weight based on the weight of the nonwoven fabric. The cleaning sheet according to 1. 3. The alkyl compound having 6 carbon atoms is used as the antistatic agent.
-24 straight-chain or branched-chain) sulfonates (sodium or potassium salts), or polyoxyethylene (ethylene oxide addition mole number 1-30) alkyl (carbon number 6-2)
The cleaning sheet according to claim 1 or 2, which is a linear or branched ether ether phosphate (sodium or potassium salt) of No. 4. 4. The cleaning sheet according to any one of claims 1 to 3, which is used by being attached to the cleaning unit in a cleaning tool including a cleaning unit and a rod-shaped grip connected to the cleaning unit. 5. A bonding portion is provided by bonding,
It is formed in a flat bag shape having an insertion space inside thereof, and the head portion of a cleaning tool having a handle provided with a cleaning sheet mounting head at its tip portion is inserted into the insertion space to The cleaning sheet according to any one of claims 1 to 3, which is used by being attached to a head portion.