JPWO2006095623A1 - Nonwoven fabric for cleaning - Google Patents

Abstract

Disclosed is a non-woven fabric for cleaning that does not require detergents, lubricants, abrasives, bleaching agents, etc., and can remove tea astringency and mold without causing scratches on tableware and joints. SOLUTION: The cross section of the fiber has a flat shape, the flatness is 6-30 in the cross section, and 30% by mass or more of polyvinyl alcohol fiber formed by forming a groove in the longitudinal direction of the outer periphery of the fiber is contained. A nonwoven fabric for cleaning composed of a nonwoven fabric.

Description

  The present invention relates to a non-woven fabric for cleaning that can be easily removed without using a detergent, from slight oil stains to stubbornly sticky stains such as tea astringents, scales or pitches.

  Conventionally, in each household, a bleaching agent containing sodium hypochlorite as a main component has been immersed in a diluted solution in order to remove mold generated on tea pots stuck to teacups or tile joints in bathrooms. It is used in the form of mist or foam. However, a solution using sodium hypochlorite has strong alkalinity and causes rough skin, especially when mixed with an acidic cleaning agent, a large amount of chlorine gas is generated suddenly, irritating the mucous membrane of the eyes and throat, affecting the human body. And has a problem of lack of safety.

  In addition, in order to scrub off burns stuck to pots and kettles, glue a nylon scrub on a single side or a nylon scrub with strong hardness on a turtle scallop, steel wool, or nylon nonwoven fabric. Sponge etc. are used. However, turtle scallops, steel wool, nylon scourers, etc. have a rough and hard surface, which easily damages tableware and tile joints made of glass, ceramics, plastics, etc., and therefore cannot be applied to these. Had.

  In order to improve these problems, it is described that the scraping performance at the time of cleaning is improved by using flat fibers having a large fiber surface area for the nonwoven fabric for cleaning (see, for example, Patent Document 1). ). Such cleaning nonwoven fabrics using flat fibers have improved performance compared to conventional nonwoven fabrics that do not use flat fibers, but the removal performance against dirt that is difficult to remove is more effective by reducing the edge of the fiber cross section. I couldn't. In order to improve the removal effect by the edge of this fiber cross-section edge part, the nonwoven fabric for cleaning which provided the abrasive grain to the fiber surface is proposed (for example, refer patent documents 2-4). However, when removing dirt with these cleaning nonwoven fabrics, the portion that comes into contact with the cleaning surface becomes local, so the number of wiping required to remove the dirt increases, or hard abrasive grains are used. Therefore, there was a problem that it was easily scratched and could not be applied to tableware or water.

  On the other hand, the nonwoven fabric for cleaning which fixed the abrasive grain with the adhesive agent on the single side | surface or both surfaces of the nonwoven fabric instead of fiber itself is proposed (for example, refer patent documents 5-12). However, these non-woven fabrics for cleaning have a problem that only the portion to which the abrasive grains are fixed has a cleaning ability, and the abrasive grains are peeled off at the same time as the adhesive layer is worn during cleaning, so that the sustainability of the cleaning ability is low. Was.

  Moreover, the nonwoven fabric for cleaning which formed the porous resin layer in the fiber which comprises a nonwoven fabric without using an abrasive grain is proposed (for example, refer patent documents 13-15), Furthermore, thermosetting resin is used. A method of adhering to a nonwoven fabric has been proposed (see, for example, Patent Document 16). However, these non-woven fabrics for cleaning have a problem that the cleaning ability for tea astringency is inferior unless an abrasive containing abrasive grains is prepared and used simultaneously.

JP-A-55-58147 JP-A-5-220670 JP-A-6-155310 Japanese Patent Laid-Open No. 6-155311 Japanese Patent Laid-Open No. 5-28477 JP-A-5-57622 JP-A-5-253850 Japanese Patent Laid-Open No. 5-285854 JP-A-6-238570 Japanese Patent Laid-Open No. 7-100769 JP-A-8-300252 Japanese Patent Laid-Open No. 9-22886 JP-A-6-17374 JP-A-7-108464 JP-A-7-108465 Special Table 2000-508000

  An object of the present invention is to provide a non-woven fabric for cleaning that does not require detergents, lubricants, abrasives, bleaching agents, etc., and can remove tea astringency, mold, etc. without scratching tableware or joints. .

As a result of intensive studies to obtain the above-described nonwoven fabric for cleaning, the present inventors have a good familiarity with water and oil, and further have a flat shape that forms grooves on the fiber surface as shown in FIG. By using a polyvinyl alcohol (hereinafter abbreviated as PVA) fiber, more preferably by attaching a polymer resin to a nonwoven fabric made of the fiber, or by blending a binder fiber made of a heat fusion fiber The present inventors have found that a nonwoven fabric for cleaning that can achieve the above-described object can be obtained by increasing the contact area to the cleaning surface and increasing the edge.
That is, in the present invention, the fiber cross section has a flat shape, the flatness is 6 to 30 in the cross section, and 30% by mass or more of PVA fiber formed by forming a groove in the outer peripheral longitudinal direction of the fiber is contained. The nonwoven fabric for cleaning composed of the nonwoven fabric, preferably the PVA fiber is a fiber having one or more grooves having a depth of 0.1 to 2.0 μm within 10 μm intervals in the longitudinal direction of the outer periphery of the fiber. A non-woven fabric for cleaning, more preferably the above-mentioned non-woven fabric for cleaning having a single fiber fineness of PVA fibers of 0.5 to 5 dtex and a fiber length of 5 to 80 mm, more preferably PVA fibers having an average particle size of 0. It is said nonwoven fabric for cleaning which is a fiber containing 0.5-30 mass% of layered compounds of 0.01-30 micrometers.

  Further, the present invention is preferably the above-mentioned non-woven fabric for cleaning having a tensile strength at 3% elongation in any direction of the non-woven fabric of 1.0 kg / 25 mm or more, more preferably a binder fiber comprising a heat-sealing fiber. 10% by mass or more of the above-mentioned non-woven fabric for cleaning, more preferably, the above-mentioned non-woven fabric for cleaning formed by adding 5 to 200% by mass of the polymer resinous material to the non-woven fabric weight, and The said high molecular resin-like material provided to a nonwoven fabric is a nonwoven fabric for cleaning which consists of thermosetting resins.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the nonwoven fabric for cleaning which is excellent in cleaning property, and does not damage the object to be wiped and has excellent cleaning ability. Even stubbornly sticky dirt can be easily removed without using a detergent.

  The present invention will be specifically described below. First, the fiber cross section of the PVA fiber used in the present invention needs to be flat. Specifically, the flatness expressed by the ratio of the long side to the short side length of the fiber cross section is required to be 6 to 30, and preferably 10 to 25. When the cross-sectional shape of the PVA fiber is a saddle-shaped cross-section, a round cross-section, or a flatness of less than 6, the contact area with the cleaning surface becomes small, and the cleaning performance intended by the present invention cannot be obtained. Conversely, when the flatness exceeds 30, the interface between the fibers temporarily bonded during spinning becomes difficult to peel off, and when a nonwoven fabric is produced from the fibers, a large number of shell-like lumps are generated in the sheet, and the number of constituent fibers This leads to a reduction in the wiping performance.

  In addition, the PVA fiber used in the present invention has the above-described flatness, and it is important that a groove is formed on the surface of the fiber in the longitudinal direction of the outer periphery of the fiber. It is preferable that at least one groove having a depth of 0.1 to 2.0 μm exists in the direction within an interval of 10 μm. This groove can be formed by controlling the solidification rate at the time of fiber production, and can exhibit an edge effect when the dirt is scraped to improve the dirt removing performance. If the number of grooves is less than 1 within 10 μm, sufficient scraping performance may not be obtained. Further, in order to improve the dirt removing performance, it is preferable that 3 or more and 10 or less exist within an interval of 10 μm. If the depth of the groove is less than 0.1 μm, it may be buried due to a polymer resinous material to be described later or dirt during cleaning. On the other hand, if the depth exceeds 2.0 μm, the fiber easily breaks by the groove portion. In other words, the formation of the nonwoven fabric may be hindered. More preferably, it is 0.3-1.5 micrometers, More preferably, it is 0.5-1.0 micrometer.

  FIG. 1 shows a fiber cross-sectional photograph of the PVA fiber of the present invention, and FIG. 2 shows a fiber cross-sectional photograph of a PVA fiber manufactured conventionally. The cross-sectional shape of the PVA-based fiber manufactured conventionally in FIG. 2 is called a saddle shape, whereas the cross-sectional shape of the PVA-based fiber of the present invention in FIG. 1 has a flat shape with a very short short side, And it turns out that the groove | channel which continues in the longitudinal direction of a fiber exists in the fiber surface.

  The PVA polymer used in the production of the PVA fiber of the present invention is not particularly limited, and for example, any one of a carboxylic acid group, a sulfonic acid group, an ethylene group, a silane group, a silanol group, an amine group, an ammonium group, and the like. Alternatively, two or more may be copolymerized. The saponification degree of PVA is not particularly limited, and those having a saponification degree of 85 to 99.9 mol%, preferably 96 to 99.9 mol% are used.

The method for producing the PVA fiber of the present invention is not particularly limited, and examples thereof include dry spinning, wet spinning, dry and wet spinning, and wet spinning is preferably employed from the viewpoint of productivity and quality.
Among them, the wet spinning method is roughly divided into two methods. One is a water-based wet spinning method in which a PVA polymer is dissolved in water to form a spinning stock solution, and then discharged into an aqueous solution of a salt having a coagulation ability through a nozzle hole to form a fiber. The other is a PVA polymer organically. This is an organic solvent-based wet spinning method in which a spinning solution is prepared by dissolving in a solvent, and then discharged into an organic solvent having a solidifying ability through a nozzle hole to form a fiber. Any of these methods can be used.

Of the above spinning methods, the water-based wet spinning method will be described below.
Specifically, first, a spinning dope is prepared by dissolving a PVA polymer in water. Although there is no restriction | limiting in particular in the polymerization degree of the PVA type polymer used at this time, Generally it is preferable that it is a polymerization degree 500-4000, More preferably, the thing of the range of 1000-2500 is used. If the degree of polymerization is less than 500, the entanglement of the molecular chain is small, and sufficient stretchability cannot be obtained in the stretching step. As a result, physical properties such as fiber strength and water resistance are lowered. On the other hand, when the degree of polymerization exceeds 4000, the viscosity of the stock solution is remarkably increased, so that the concentration of the PVA polymer in the stock solution needs to be lowered. The concentration of the stock solution at the time of spinning is preferably 10 to 20% by mass. When the concentration of the stock solution is less than 10% by mass, the discharge amount of the PVA-based resin is lowered and the productivity is lowered. On the other hand, if it exceeds 20% by mass, the volume shrinkage due to dehydration becomes small, and it becomes difficult to form grooves on the fiber surface.

  The PVA fiber of the present invention is preferable because, by adding a layered compound together with the above-described PVA polymer, a volume shrinkage at the time of coagulation is increased and a fiber having a larger difference in height of grooves formed on the fiber surface is obtained. Examples of the layered compound include smectite, montmorillonite, mica and the like. These may be natural products or synthetic products. However, in order to add to the fiber spinning dope, the average particle size is preferably in the range of 0.01 to 30 μm. When the average particle diameter exceeds 30 μm, the spinning nozzle and the filter are clogged, and the spinnability is deteriorated. On the other hand, when the average particle diameter is smaller than 0.01 μm, the layered compounds are aggregated. As a result, the secondary particles become several tens of μm or more, and the spinning nozzle and the filter are clogged, and the spinning property is deteriorated. To do. More preferably, the average particle size is 0.1 to 10 μm.

  Moreover, it is preferable that the addition amount to the fiber of a layered compound is added 0.5-30 mass% with respect to a fiber. When the addition amount is less than 0.5% by mass, there is not much change in the height difference of the grooves formed on the fiber surface. On the contrary, if the addition amount exceeds 30% by mass, not only the spinnability becomes unstable, but also the physical properties of the obtained fiber are remarkably lowered. More preferably, it is 1-10 mass%.

  When the PVA fiber of the present invention is produced, the shape of the nozzle single hole used for spinning is preferably a slit shape. Specifically, a rectangular shape having a long side of 180 to 1000 μm and a short side of 30 to 80 μm, a long end of the rectangle made into a semicircle, or a so-called “dockbone” shape in which the long end is circularly processed. Used. However, since the cross-sectional shape of the obtained fiber does not necessarily match the nozzle shape, the ratio of the long side / short side of the nozzle single hole is preferably in the range of 5 to 50. A PVA fiber having a flat cross-sectional shape can be obtained.

  The spinning solution is passed through the nozzle having the shape described above, discharged into a saturated aqueous solution of sodium sulfate, wound up with a first roller, and then wet stretched 3-4 times while still containing water. The fiber of the present invention can be obtained by performing constant length drying in a hot air dryer at 130 ° C. after the wet stretching, and further performing dry heat stretching 2 to 3 times in a hot air oven at 230 ° C. The PVA fiber of the present invention can be used as it is, and subsequently subjected to a formalization treatment with formaldehyde to impart water resistance.

  Either short fibers or long fibers can be used for the PVA fibers of the present invention. When short fibers are used, the fiber length is 5 to 80 mm, preferably 10 to 60 mm, from the viewpoint of ease of manufacturing the nonwoven fabric and preventing the fibers from falling off during use. If the fiber length exceeds 80 mm, the fibers become entangled and formation with a card cannot be performed. On the other hand, if the thickness is less than 5 mm, the fibers will fall off drastically.

  The fineness of the PVA fiber of the present invention is preferably 0.5 to 5 dtex. If it is less than 0.5 dtex, the fibers are likely to be entangled due to a decrease in aspect ratio, resulting in a sheet with a disordered formation when formed into a sheet. On the other hand, if the fineness exceeds 5 dtex, the number of fibers constituting the non-woven fabric is reduced, resulting in a non-woven fabric with a rough surface, and the scraping effect during cleaning, which is the object of the present invention, cannot be obtained. More preferably, it is 1-4 dtex. The fineness of the fiber may be adjusted as appropriate depending on the nozzle diameter and the draw ratio.

The fiber thus obtained can produce a dry nonwoven fabric by the following method.
For example, first, the PVA fiber of the present invention is mechanically crimped, cut to a fiber length of 51 mm, and carded to produce a web. When producing a web, the fiber used may be the fiber alone, but one or two of rayon, polynosic, solvent-spun cellulose fiber, acetate, polyester, nylon, acrylic, polyethylene, polypropylene, polylactic acid fiber, cotton, etc. The above may be blended. The blending ratio of the PVA fiber of the present invention needs to be 30% by mass or more, preferably 50% by mass or more, more preferably 70% by mass or more and 100% by mass or less. When the blending ratio is less than 30% by mass, the absolute amount of the PVA fiber that contacts the wiping surface is small, and the scraping effect cannot be obtained insufficiently. A dry nonwoven fabric can be obtained by applying a high-pressure water flow of 30 kg / cm ² or more to the web thus obtained, or by needle punching at a density of 250 pieces / cm ² or more.

On the other hand, a wet nonwoven fabric can be obtained by cutting the fiber into a fiber length of 10 mm and wet-making with a binder fiber. At this time, as in the case of the production of the dry nonwoven fabric, it may be mixed so that other types of fibers are less than 70% by mass. A wet nonwoven fabric can be obtained by applying a high-pressure water flow of 30 kg / cm ² or more to a base paper obtained by making a slurry containing at least part of the fiber of the present invention.

Although a nonwoven fabric is manufactured by the method as described above, in order to obtain the cleaning performance targeted by the present invention, it is important that the fibers constituting the nonwoven fabric are sufficiently fixed in the nonwoven fabric. It is preferable that the non-woven fabric is provided with a polymer resinous material, or binder fibers made of heat-sealing fibers are mixed. If the fibers are not sufficiently fixed, when used as a cleaning nonwoven fabric, the fibers move when the dirt is scraped off, so that the scraping force escapes. In addition, the loss of fibers to the wiping target after cleaning, which is fatal as a nonwoven fabric for cleaning, occurs. The fixing of the fibers by these methods correlates with the inclination of the elongation-tensile strength curve of the nonwoven fabric, and the inclination increases as the fixing proceeds, so that the tensile strength at the time of elongation of the nonwoven fabric increases. That is, the high tensile strength when the nonwoven fabric is stretched is an index of the scraping performance.
FIG. 3 shows an example of the elongation-tensile strength curve of the nonwoven fabric. The behavior of the nonwoven fabric during elongation will be described with reference to FIG. (A) shows the elongation-tensile strength curve of a conventional nonwoven fabric constructed by mechanical entanglement using only ordinary fibers, and the nonwoven fabric of the present invention is made of a polymer resinous material or a heat-sealed fiber. The elongation-tensile strength curve of the non-woven fabric fixed in (B) is (B).
The non-woven fabric (B) fixed with the binder fiber made of the polymer resin material or heat-bonding fiber of the present invention has a breaking elongation of ½ or less compared to the conventional non-fixed (A), and the same elongation. The tensile strength at the time also increases. Furthermore, the nonwoven fabric of the present invention fixed with a binder fiber made of a polymer resinous material or a heat-sealing fiber has a large recovery area even after elongation. This more clearly indicates that the fibers in the nonwoven fabric are fixed by a binder fiber made of a polymer resinous material or a heat-sealing fiber.
Therefore, in the present invention, when the region where the nonwoven fabric of (B) in FIG. 3 can recover after stretching is defined as I, the tensile strength when the elongation is 3%, which is the region boundary where the nonwoven fabric can stretch and recover with the fibers fixed. Was defined as a scale indicating how much the fibers in the nonwoven fabric are fixed by the binder fibers made of polymer resinous materials or heat-sealing fibers. In addition, the elongation-tensile strength curve of the nonwoven fabric referred to in the present invention is obtained by the method described later.

  In the nonwoven fabric in which the polymer resin-like material of the present invention is applied or the binder fiber composed of the heat-sealing fiber is mixed, in order to ensure sufficient fiber fixation and improve the scraping performance, If the tensile strength at 3% elongation defined above is 1.0 kg / 25 mm or more, preferably 1.2 kg / 25 mm or more and 15 kg / 25 mm or less in any direction of the nonwoven fabric, the fibers constituting the nonwoven fabric are sufficient in the nonwoven fabric. The performance of the nonwoven fabric for cleaning which is the object of the present invention is easily obtained. The tensile strength at 3% elongation of the nonwoven fabric is more preferably 1.0 kg / 25 mm or more in any of the flow direction (MD) and the width direction (CD) of the nonwoven fabric for cleaning, but at least one of them If it is 1.2 kg / 25 mm or more in this direction, sufficient scraping performance is exhibited. On the other hand, if the tensile strength at the time of 3% elongation is less than 1.0 kg / 25 mm, the fibers in the nonwoven fabric are not sufficiently fixed at the time of scraping the dirt at the time of cleaning. In many cases, it cannot be obtained.

  In the case of blending a binder fiber composed of a heat-bonding fiber into the nonwoven fabric of the present invention, the heat-bonding fiber may be any fiber that can exhibit binder performance in a normal nonwoven fabric production process, such as polyester fiber, polyolefin fiber, nylon. Examples of the fiber include polylactic acid fiber and polylactic acid fiber, but are not particularly limited. The blend amount of the heat-sealing fibers is preferably 10% by mass or more, and more preferably 20% by mass or more. If the amount of blended cotton is less than 10% by mass, sufficient fibers cannot be fixed, so that not only the wiping performance is deteriorated, but also the fibers fall into the cleaning object which is fatal as a nonwoven fabric for cleaning. It may end up.

  When applied to the polymeric resinous material to the nonwoven fabric of the present invention, the applied polymeric resinous material is effective even when the object to be wiped at a high temperature such as in a range or when the temperature rises due to frictional heat, etc. A thermosetting resin in which a decrease in the viscosity is not observed is good, and examples thereof include phenolic resins, urea resins, melamine resins, epoxy resins, and self-crosslinking acrylic resins such as polyacrylic acid, but are not particularly limited. Absent. In the case of a resin that is not self-crosslinkable, it is important to mix an appropriate amount of a curing agent corresponding to each resin and supply heat necessary for curing.

  The adhesion amount of the polymer resinous material is preferably 5 to 200% by mass with respect to the weight of the nonwoven fabric. The adhesion effect of the polymer resinous material has an advantage that the edge effect is further improved by coating the fiber surface with a hard polymer resinous material in addition to fixing the fiber. If the amount of the polymeric resinous material attached is less than 5% by mass, the fibers will not be fixed sufficiently, and the fibers in the nonwoven fabric will move when removing the dirt. In many cases, the performance cannot be obtained. On the other hand, if it exceeds 200% by mass, the resin content becomes excessive, filling the space for holding the scraped dirt, and the dirt component may inhibit the contact with the wiping surface. More preferably, it is 10-150 mass%, More preferably, it is 20-100 mass%. When the content is 20% by mass or more, the portion that coats the fiber surface with the polymer resinous material is increased, thereby enhancing the edge effect and further improving the scraping effect.

  As a method for attaching the polymer resinous material, a solution or a monomer made of the above-described resin is used, and the solvent is evaporated by adhering to the fiber surface and the entangled part of the nonwoven fabric, or polymerized and solidified on the fiber. Is preferred. Abrasives are added to the above-described polymer-based resinous material as necessary, and the resin is dried, and at the same time, the abrasive is fixed to the nonwoven fabric, or the polymer-based resinous material is coated on the nonwoven fabric and dried. Before making it, you may spray an abrasive | polishing agent and you may make it adhere to a nonwoven fabric. By using an abrasive together, the scraping effect is improved, and the scraping performance such as sticking dirt is greatly improved. The abrasive is not particularly limited as long as it is a known abrasive, and examples thereof include alumina, diatomaceous earth, silica, calcium carbonate, calcium phosphate, carborundum, gold sand, glass beads, mica and the like. The size and shape of the abrasive may be set according to the intended use, but it is preferable to use particles having a particle size of 5 μm or less.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the examples. In the examples of the present invention, the flatness of the fiber, the number of grooves existing on the fiber surface, the depth of the groove, the tensile strength when stretched by 3%, the fiber falling off, the cleaning performance, and the scratching property during cleaning Is measured by the following measurement method.

[Fiber flatness]
The length of the long side and the short side of the fiber cross section are measured by a photograph obtained by taking a cross section of the fiber with a scanning electron microscope (“S-510” manufactured by Hitachi, Ltd.) at a magnification of 1000 times. Calculated and expressed as an average value of 20 fibers.
Flatness = Long side length / Short side length

[Number of grooves on the fiber surface, depth of grooves]
The number of grooves per 10 μm of the outer periphery of the outer periphery of the fiber and the depth of the groove are measured with a photograph taken with a scanning electron microscope (“S-510” manufactured by Hitachi, Ltd.) at a magnification of 3000 times. And expressed as an average value of 20 fibers.

[Tensile strength at 3% elongation kg / 25mm]
In accordance with the tensile strength measurement method of JIS L1096, a test piece having a width of 25 mm in the MD direction of the nonwoven fabric was prepared, an elongation-tensile strength curve as shown in FIG. 3 was measured, and the elongation was 3% from the obtained measurement curve. The tensile strength of was determined.

[Fabricity of fibers]
Judgment was made based on the presence or absence of fiber dropout during the cleaning performance evaluation.

[Cleaning performance]
Cut non-woven fabric into 5cm x 5cm, drop 0.15ml of ink on a transparent acrylic plate, wipe it with 200g weight, and wipe the acrylic plate after wiping the color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd.) The transmittance was measured with “Z-300A”), and when the transmittance was 80% or more, the cleaning performance was evaluated as good (◯).

[Scratch when cleaning]
A non-woven fabric cut to 5 cm × 5 cm is impregnated with 200% / non-woven fabric moisture, an OHP sheet (“VF-1” manufactured by KOKUYO) is attached to a friction fastness tester, and the non-woven fabric is rubbed 200 times to rub. The presence or absence of scratches on the subsequent OHP sheet was visually observed and evaluated.

[Example 1]
(1) Spinning comprising an aqueous solution of 15% by mass of PVA polymer having an average polymerization degree of 1700 and a saponification degree of 99.9% by mole and a layered compound (synthetic mica “MEB-3” manufactured by Corp Chemical Co., Ltd.) of 2.0% by mass. The stock solution was discharged into a coagulation bath made of saturated sodium sulfate from a rectangular slit-type spinneret having a number of holes of 4000, length of 30 μm × width of 450 μm, wound with a first roller, subjected to wet stretching four times, and then 130 Drying was performed at ° C. Subsequently, dry heat drawing is performed twice at 230 ° C., and there are three grooves each having a single fiber fineness of 1.2 dtex, a flatness of 15, and a depth of 10 μm in the fiber outer circumferential direction at a depth of 0.3 μm, as shown in FIG. A shaped PVA fiber was obtained. The obtained PVA fiber was acetalized for 60 minutes in an aqueous solution consisting of 5% by mass of formaldehyde and 10% by mass of sulfuric acid.
(2) The PVA fiber obtained in the above (1) is cut to 10 mm, and the cut PVA fiber and 2.2 dtex × 10 mm polyester binder fiber (“N720” manufactured by Kuraray Co., Ltd.) are PVA fiber / polyester. A wet nonwoven fabric with a basis weight of 30 g / m ² was produced by mixing at a composition of fiber = 80/20 (mass ratio). Subsequently, an entanglement treatment was performed at a water pressure of 60 kg / m ² using a water entanglement device.
(3) Table 1 shows the performance evaluation results of the obtained nonwoven fabric. The tensile strength at 3% elongation of the obtained nonwoven fabric was 1.4 kg / 25 mm, and it was confirmed that the fibers were sufficiently fixed by the binder in the nonwoven fabric. In addition, the nonwoven fabric obtained in this manner had no fibers falling off, had good cleaning properties, and was not scratched during cleaning.

[Example 2]
A nonwoven fabric was obtained under the same conditions as in Example 1 except that the fiber composition of the nonwoven fabric was changed to PVA fiber / polyester fiber = 50/50 (mass ratio). The performance evaluation results of the obtained nonwoven fabric are shown in Table 1. As in Example 1, the obtained nonwoven fabric had no fibers falling off, and had good cleaning properties and scratching properties during cleaning.

[Example 3]
A spinning stock solution comprising an aqueous solution of 15% by mass of PVA polymer having an average degree of polymerization of 1700 and a saponification degree of 99.9% by mol and a layered compound (synthetic mica “MEB-3” manufactured by Coop Chemical Co., Ltd.) is 2.0% by mass. 4000, length 50μm × width 300μm rectangular slit type spinneret is discharged into a coagulation bath consisting of saturated sodium sulfate, wound with the first roller, 4 times wet stretching, and then dried at 130 ° C went. Subsequently, dry heat drawing is performed twice at 230 ° C., and there are three grooves each having a single fiber fineness of 1.3 dtex, a flatness of 6, and a depth of 10 μm in the fiber outer circumferential direction at a depth of 0.3 μm, as shown in FIG. A shaped PVA fiber was obtained. The obtained PVA fiber was acetalized for 60 minutes in an aqueous solution consisting of 5% by mass of formaldehyde and 10% by mass of sulfuric acid.
Then, the nonwoven fabric was manufactured on the conditions similar to Example 1 using this fiber. The performance evaluation results of the obtained nonwoven fabric are shown in Table 1. As in Example 1, the obtained nonwoven fabric had no fibers falling off, and had good cleaning properties and scratching properties during cleaning.

[Example 4]
(1) Spinning stock solution comprising an aqueous solution of 15% by mass of a PVA polymer having an average degree of polymerization of 1700 and a saponification degree of 99.9 mol% and a layered compound (synthetic mica “MEB-3” manufactured by Coop Chemical Co., Ltd.) Is discharged into a coagulation bath made of saturated sodium sulfate from a rectangular slit-type spinneret having a pore number of 4000, length of 30 μm × width of 450 μm, wound with a first roller, subjected to wet stretching four times, and then 130 ° C. And dried. Subsequently, dry heat drawing is performed twice at 230 ° C., and there are three grooves each having a single fiber fineness of 1.2 dtex, a flatness of 15, and a depth of 10 μm in the fiber outer circumferential direction at a depth of 0.3 μm, as shown in FIG. A shaped PVA fiber was obtained. The obtained PVA fiber was acetalized for 60 minutes in an aqueous solution consisting of 5% by mass of formaldehyde and 10% by mass of sulfuric acid.
(2) The PVA fiber obtained in the above (1) was cut to 10 mm to produce a wet nonwoven fabric with a basis weight of 30 g / m ² . Subsequently, the water entanglement device is entangled at a water pressure of 60 kg / cm ² , impregnated with a thermosetting acrylic resin (“Acrodure 945L” manufactured by BASF) so as to adhere to 20% by mass of the nonwoven fabric, and is an air-through type. After preliminary drying at 120 ° C. in a dryer, curing treatment was performed at 200 ° C. The performance evaluation results of the obtained nonwoven fabric are shown in Table 1. The tensile strength at 3% elongation of the obtained nonwoven fabric was 2.8 kg / 25 mm, and it was confirmed that the resin was adhered so as to fix the fibers and coat the surface of the nonwoven fabric. Moreover, in the nonwoven fabric obtained in this way, the fiber did not fall off, and the cleaning property and scratching property during cleaning were good.

[Example 5]
A nonwoven fabric was obtained in the same manner as in Example 4 except that the adhesion amount of the thermosetting acrylic resin to the nonwoven fabric was 5 mass% with respect to the nonwoven fabric. The performance evaluation results of the obtained nonwoven fabric are shown in Table 1. As in Example 1, the obtained nonwoven fabric had good cleaning properties and scratching properties during cleaning.

[Example 6]
The fiber composition of the nonwoven fabric is PVA fiber, rayon (“Corona” manufactured by Daiwabo Co., Ltd., 1.1 dtex × 7 mm), and polyester binder fiber, and the ratio thereof is PVA fiber / rayon / polyester fiber = 50/10/40 (mass ratio). The nonwoven fabric was obtained by the same production method as in Example 1 except that. The performance evaluation results of the obtained nonwoven fabric are shown in Table 1. The obtained nonwoven fabric had a tensile strength at 3% elongation of 2.3 kg / 25 mm, and, as in Example 1, there was no fiber dropout, and the cleaning property and scratching property during cleaning were good.

[Example 7]
The fiber composition of the nonwoven fabric is PVA fiber, polylactic acid fiber (manufactured by Kuraray Co., Ltd., 1.8 dtex × 10 mm), and polyester binder fiber, and the ratio thereof is PVA fiber / polylactic acid fiber / polyester fiber = 60/20/20 ( A non-woven fabric was obtained by the same production method as in Example 1 except that the mass ratio). The performance evaluation results of the obtained nonwoven fabric are shown in Table 1. The tensile strength at 3% elongation of the obtained non-woven fabric was 1.5 kg / 25 mm, and as in Example 1, there was no fiber dropout, and the cleaning property and scratching property during cleaning were good.

[Comparative Example 1]
Spinning stock solution comprising an aqueous solution of 17% by mass of PVA polymer having an average degree of polymerization of 1700 and a saponification degree of 99.9% by mol and a layered compound (synthetic mica “MEB-3” manufactured by Corp Chemical Co., Ltd.) of 0.3% by mass 1 and the nozzle shape is changed to 4000, the length is 70μm × width 210μm rectangular slit-type spinneret is discharged into a coagulation bath made of saturated sodium sulfate, wound with the first roller, 4 times wet stretch After performing, it dried at 130 degreeC. Subsequently, dry heat stretching is performed twice at 230 ° C., and there is a single fiber fineness of 1.3 dtex, flatness of 3, and one groove having a depth of 0.05 μm at intervals of 10 μm in the fiber outer peripheral longitudinal direction. A shallow PVA fiber was obtained. The obtained PVA fiber was acetalized for 60 minutes in an aqueous solution consisting of 5% by mass of formaldehyde and 10% by mass of sulfuric acid.
Then, the nonwoven fabric was manufactured by the method similar to Example 1 using this fiber. The performance evaluation results of the obtained nonwoven fabric are shown in Table 2. The obtained nonwoven fabric had good scratching properties during cleaning, but the flatness of the PVA fibers constituting the nonwoven fabric was as low as 3 and the groove was shallow, so the cleaning properties were inferior.

[Comparative Example 2]
A rectangular slit-type spinning of a spinning stock solution consisting of an aqueous solution of an average degree of polymerization of 1700, a PVA polymer of 15% by mass and a saponification degree of 99.9% by mol and boric acid of 0.3% by mass with a pore size of 4000, length 30 μm × width 450 μm. It was discharged from a die into a coagulation bath made of saturated sodium sulfate adjusted to pH 12 or higher, wound with a first roller, subjected to wet stretching four times, and then dried at 130 ° C. Subsequently, dry heat drawing was performed 3 times at 230 ° C. to obtain a PVA fiber having a single fiber fineness of 1.5 dtex and a flatness of 15 and having no grooves on the fiber surface. The obtained PVA fiber was acetalized for 60 minutes in an aqueous solution consisting of 5% by mass of formaldehyde and 10% by mass of sulfuric acid.
Then, the nonwoven fabric was obtained on the conditions similar to Example 1 using this fiber. The performance evaluation results of the obtained nonwoven fabric are shown in Table 2. Although the obtained nonwoven fabric had good scratchability at the time of cleaning, since the groove was not formed in the outer peripheral longitudinal direction of the PVA fiber constituting the nonwoven fabric, the cleaning property was inferior.

[Comparative Example 3]
A nonwoven fabric was obtained under the same conditions as in Example 1 except that the fiber composition of the nonwoven fabric was changed to PVA fiber / polyester binder fiber = 20/80 (mass ratio). The performance evaluation results of the obtained nonwoven fabric are shown in Table 2. Although the obtained nonwoven fabric had good scratching property at the time of cleaning, since the content ratio of the PVA fibers constituting the nonwoven fabric was low, the cleaning property was inferior.

[Comparative Example 4]
A nonwoven fabric was obtained under the same conditions as in Example 1 except that the fiber composition of the nonwoven fabric was changed to PVA fiber / polyester binder fiber = 95/5 (mass ratio). The performance evaluation results of the obtained nonwoven fabric are shown in Table 2. The obtained non-woven fabric was excellent in scratching and cleaning properties at the time of cleaning. However, since the blending rate of the binder fibers constituting the non-woven fabric was low, the fibers dropped out and was unsuitable as a non-woven fabric for cleaning.

[Comparative Example 5]
A nonwoven fabric was obtained in the same manner as in Example 4 except that the amount of the thermosetting acrylic resin attached to the nonwoven fabric was 3% by mass with respect to the nonwoven fabric. The performance evaluation results of the obtained nonwoven fabric are shown in Table 2. The obtained non-woven fabric was excellent in scratching and cleaning properties at the time of cleaning, but the amount of the thermosetting acrylic resin applied to the non-woven fabric is small, so that the fibers fall off and is not suitable as a non-woven fabric for cleaning. Met.

[Comparative Example 5]
A sponge with abrasive particles (“Scotch Bright” manufactured by Sumitomo 3M Limited) was evaluated in the same manner as in Example 1. As a result, cleanability was good, but many scratches remained on the object to be wiped off, and scratch resistance was poor. there were. The performance evaluation results are shown in Table 2.

As shown in Examples 1 to 5 in Table 1, 30% by mass of PVA fiber having a flatness of 6 or more according to the present invention and having grooves formed in the outer peripheral longitudinal direction of the fiber at the outer periphery of the fiber cross section. The non-woven fabric contained above or a non-woven fabric formed by applying 5% by mass or more of a thermosetting acrylic resin does not lose fibers during cleaning, and is excellent in cleaning properties and scratching properties during cleaning.
On the other hand, as shown in Table 2, a non-woven fabric using PVA fibers having a flatness of less than 6 in Comparative Example 1 and a shallow groove formed in the fiber outer peripheral portion, and PVA fibers having no groove in the outer peripheral portion of Comparative Example 2 are used. When the binder fiber was mixed in the nonwoven fabric having the PVA fiber content of less than 30% by mass in the nonwoven fabric of Comparative Example 3 and the nonwoven fabric of Comparative Example 4, the blended amount of the binder fiber was less than 10% by mass. In this case, the nonwoven fabric in which the adhesion amount of the thermosetting acrylic resin to the nonwoven fabric of Comparative Example 5 was less than 5% by mass with respect to the nonwoven fabric was good in scratching property at the time of cleaning. It was inferior to the non-woven fabric, or fibers were dropped during cleaning, and was not suitable as a non-woven fabric for cleaning. Further, in the case of the commercially available sponge with abrasive particles as in Comparative Example 5, the cleanability was good, but many scratches remained on the object to be wiped off, and the scratchability was poor.

  According to the present invention, it is possible to provide a non-woven fabric having excellent cleaning ability and excellent cleaning ability and having no wiping on the object to be wiped. Even sticky dirt can be easily removed without using a detergent.

The microscope picture which shows the cross-sectional shape of the PVA type fiber used for the nonwoven fabric for cleaning of this invention. The microscope picture which shows the nonwoven fabric for cleaning using the conventional saddle-shaped cross-sectional shape PVA type fiber. The figure which shows an example of the elongation-tensile strength curve of a nonwoven fabric.

Claims (8)

  The cross section of the fiber has a flat shape, the flatness is 6 to 30 in the cross section, and the non-woven fabric is composed of 30% by mass or more of polyvinyl alcohol fiber formed with grooves in the longitudinal direction of the outer periphery of the fiber. Nonwoven fabric for cleaning.   The non-woven fabric for cleaning according to claim 1, wherein the polyvinyl alcohol fiber is a fiber having at least one groove having a depth of 0.1 to 2.0 µm within a distance of 10 µm in the longitudinal direction of the outer periphery of the fiber.   The nonwoven fabric for cleaning according to claim 1 or 2, wherein the polyvinyl alcohol fiber has a single fiber fineness of 0.5 to 5 dtex and a fiber length of 5 to 80 mm.   The nonwoven fabric for cleaning according to any one of claims 1 to 3, wherein the polyvinyl alcohol fiber is a fiber containing 0.5 to 30% by mass of a layered compound having an average particle size of 0.01 to 30 µm.   The nonwoven fabric for cleaning according to any one of claims 1 to 4, wherein a tensile strength at 3% elongation in any direction of the nonwoven fabric is 1.0 kg / 25 mm or more.   The nonwoven fabric for cleaning according to any one of claims 1 to 5, which is formed by blending 10% by mass or more of binder fibers composed of heat-sealing fibers.   The cleaning nonwoven fabric according to any one of claims 1 to 5, wherein the polymer resinous material is provided in an amount of 5 to 200 mass% based on the weight of the nonwoven fabric. The nonwoven fabric for cleaning according to claim 7, wherein the polymer resin material applied to the nonwoven fabric comprises a thermosetting resin.

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