JP2005232655A - Nonwoven fabric for impregnating high concentration alcohol - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonwoven fabric suitable for impregnating a high concentration alcoholic liquid, especially the nonwoven fabric suitable for obtaining a wiping cloth impregnated with the high concentration alcoholic liquid by using it as a wiping cloth substrate. <P>SOLUTION: This nonwoven fabric is constituted by a synthetic fiber containing a polyalkylene glycol. The synthetic fiber is preferably a very fine fiber obtained by dividing a fiber. As the polyalkylene glycol, polyethylene glycol is preferable. As the synthetic fiber, a polyester-based fiber is preferable. The impregnated alcoholic liquid has ≥70 mass% and <95 mass% concentration. As the alcohol, alcohols having <100°C boiling point are preferable, and concretely, isopropanol and/or ethanol are preferable. The impregnated amount of the alcoholic liquid is preferably 60-120 mass% based on the mass of the nonwoven fabric. It is preferable to use the nonwoven fabric as the wiping cloth by using the fabric as the wiping cloth substrate impregnated and held with the alcoholic liquid having the prescribed concentration. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a nonwoven fabric suitable for impregnating and retaining an alcohol solution having a high alcohol concentration. The present invention relates to a non-woven fabric suitable for use as a wiping substrate.

  Conventionally, various wipes, particularly wipes impregnated with a chemical solution (wet wiper) have been used to wipe off the dirt on the surface of various articles. As this wiping cloth, a nonwoven fabric impregnated with a liquid component such as water or a surfactant is used. The performance required for the wiping cloth is focused on the ability to wipe off dirt, and various improvements have been made. For example, the nonwoven fabric has been improved so that fine dirt can be satisfactorily removed by using an ultrafine fiber as a constituent fiber. In addition, surfactants that have an antistatic function so that dust and the like are less likely to adhere when wiping off, those that have excellent removal of sebum dirt such as dirt, and oil films that do not remain easily after wiping. Has been developed (Patent Document 1).

  As described above, the conventional wiping cloth focuses on the wiping property of dirt. It was inappropriate. This is because the conventional wiping cloth has hardly been considered as follows. In other words, it was possible to remove the stains only by rubbing lightly, and little consideration was given so that no wiping trace remained at the rubbed portion. In the case of eyeglass lenses or camera lenses, scratching may cause scratches, and such scratches may make it difficult to see. Further, when the wiping trace remains, it may be difficult to see the same. Therefore, to wipe off the dirt on the surface of the eyeglass lens or camera lens, it is necessary to use a wiping cloth that can be removed by simply rubbing lightly and that no trace of wiping remains.

Japanese Patent Laid-Open No. 8-280596 (claims on the second page, paragraph number 0010 on the third page)

  Therefore, the present invention has an object to provide a wiping cloth base material that, when wiping off a transparent glass surface such as an eyeglass lens or a camera lens, can easily wipe off dirt, and a wiping surface of a chemical solution hardly remains on the wiping surface. It was made as.

  In order to solve such a problem, it is necessary to use a chemical solution that is excellent in dirt removal property and that that immediately evaporates when attached to the wiping surface. The present inventor has found that it is suitable to use a high-concentration alcohol solution as such a chemical solution.

  However, in the case of a generally used nonwoven fabric, it has been difficult to impregnate a relatively large amount of a high-concentration alcohol liquid. This is because many fibers constituting the nonwoven fabric are not alcoholic. In addition, even when such a nonwoven fabric is forcibly impregnated with a large amount of alcohol liquid, a large amount of the alcohol liquid is transferred to the wiping surface during wiping, and it may be difficult to evaporate.

  Therefore, the present invention uses a hydrophilic alcohol-based synthetic fiber as a constituent fiber of the non-woven fabric, and can impregnate and retain a relatively large amount of a high-concentration alcohol liquid, and even when wiping, The alcohol liquid is prevented from being transferred to the surface in large quantities.

  That is, the present invention is a nonwoven fabric for impregnating an alcohol solution having an alcohol concentration of 70% by mass or more and less than 95% by mass, and the nonwoven fabric is composed of a synthetic fiber containing polyalkylene glycol. The present invention relates to a high-concentration alcohol-impregnated nonwoven fabric.

  The constituent fiber of the nonwoven fabric according to the present invention is a synthetic fiber containing polyalkylene glycol. Polyalkylene glycol should just be contained in the predetermined amount in synthetic fiber, for example, should just be contained 50 mass% or more. Moreover, the nonwoven fabric which concerns on this invention should just employ | adopt the synthetic fiber containing polyalkylene glycol as one of the constituent fibers, for example, 20-80 mass% of synthetic fibers containing polyalkylene glycol, and polyalkylene You may consist of 80-20 mass% of synthetic fibers which do not contain glycol. Of course, the nonwoven fabric which concerns on this invention may consist of 100 mass% of synthetic fibers containing polyalkylene glycol.

  As the polyalkylene glycol, conventionally known ones such as polyethylene glycol and polypropylene glycol are used. Generally, it is preferable to use polyethylene glycol having a mass average molecular weight of 2000 to 20000. As the synthetic fibers, conventionally known fibers such as polyester-based synthetic fibers and polyolefin-based synthetic fibers are used. Generally, polyester-based fibers are used. This is because the polyethylene glycol having a mass average molecular weight of 2000 to 20000 has good compatibility with the polyester, and the polyethylene glycol can be uniformly contained in the fiber. The content of the polyalkylene glycol in the synthetic fiber may be arbitrary, but is generally preferably about 1.5 to 15% by mass, and more preferably about 3 to 10% by mass. This is because the synthetic fiber containing polyalkylene glycol exhibits a good alcoholic property at such a content ratio.

As the fineness of the synthetic fiber, it is preferable to use ultrafine fibers having a fineness of about 0.05 to 1.5 denier regardless of whether or not polyalkylene glycol is contained. This is because it is excellent in wiping off fine dust and sebum. The basis weight of the nonwoven fabric is preferably about 10 to ²⁰⁰ g / m2. This is because those in this range are suitable for use as a wiping cloth substrate.

  As the nonwoven fabric according to the present invention, basically, it is preferable to use those described in WO01 / 039562. That is, first, a polyester polymer A containing a polyoxyalkylene glycol having a mass average molecular weight of 2000 to 20000 and a polyolefin polymer B that is incompatible with the polyester polymer A are bonded. A split type composite fiber is prepared. The cross section of this split type composite fiber has a shape as shown in FIG. 1, for example. Then, after the split type composite fibers are accumulated to form a nonwoven web, the nonwoven web is partially heated to soften or melt the polyolefin-based polymer B to form a large number of fusion zones. To do. Then, the split type composite fiber in the area other than the fused area is split and split by a known means such as water needling, and the ultrafine fiber made of the polyester polymer A containing polyalkylene glycol and the polyolefin polymer B A non-woven fabric formed by producing ultrafine fibers made of the above can be used. In the description of WO01 / 039562, the nonwoven fabric is subjected to plasma treatment. However, in the present invention, plasma treatment may not be performed. Of course, it goes without saying that plasma treatment may be performed.

  The alcohol liquid impregnated into the nonwoven fabric has an alcohol concentration of 70% by mass or more and less than 95% by mass, preferably 80% by mass or more and less than 95% by mass. That is, it is composed of 70 parts by mass or more and less than 95 parts by mass of alcohol and 5 parts by mass or more and 30 parts by mass or less of other components such as water. When the alcohol concentration is less than 70% by mass, the stain removability of the wiping surface becomes insufficient. Moreover, since the alcohol liquid which remained on the wiping surface does not evaporate rapidly, it is not preferable. Further, if the alcohol concentration is 95% by mass or more, white streaks (transpiration traces of alcohol liquid) remain on the wiping surface, which is not preferable.

  Moreover, conventionally well-known alcohol is used as alcohol, However, It is preferable to employ | adopt the thing whose boiling point is less than 100 degreeC. This is because when an alcohol having a boiling point of less than 100 ° C. is used, the alcohol liquid remaining on the wiping surface is easily evaporated. Specifically, it is preferable to use isopropanol or ethanol alone or in combination.

The alcohol liquid is preferably impregnated in an amount of 60 to 120% by mass with respect to the mass of the nonwoven fabric. That is, if the basis weight of the nonwoven fabric is 50 g / m ^2, preferably an alcohol solution 30 to 60 g / m ² impregnated. When the impregnation amount of the alcohol liquid is less than 60% by mass, the alcohol tends to make it difficult to remove dirt such as sebum dirt on the wiping surface. Moreover, when the amount of impregnation of the alcohol liquid exceeds 120% by mass, excess alcohol liquid tends to adhere to the wiping surface, and the adhesion trace tends to remain.

  When the nonwoven fabric according to the present invention is used to impregnate a high-concentration alcohol liquid, a wiping cloth (wet wiper) can be obtained. This wiping cloth is of a size that can be gripped with fingers, and is provided to consumers in a state of being enclosed in an airtight bag. And a consumer opens an airtight bag, takes out a wiping cloth, and wipes off the stain | pollution | contamination of transparent glass surfaces, such as a spectacle lens or a camera lens. Further, not only the surface of the transparent glass but also the case of wiping off the surface of other articles that are inappropriate for wiping off dirt with a strong force is preferably used.

  The nonwoven fabric according to the present invention comprises synthetic fibers containing polyalkylene glycol as constituent fibers. Since this synthetic fiber contains polyalkylene glycol, it is hydrophilic. Therefore, it is excellent in wiping property and can be well impregnated with a high-concentration alcohol liquid that quickly evaporates from the wiping surface and retains the liquid. Therefore, when this non-woven fabric is used as a wiping cloth base material and impregnated and retaining a high-concentration alcohol liquid and used as a wiping cloth (wet wiper), alcohol is squeezed out when wiping the wiping surface, and the wiping surface Even after removing various kinds of dirt such as sebum dirt, it is difficult to transfer to the wiping surface. In other words, because of the oleophilic nature of the synthetic fibers containing polyalkylene glycol, the impregnated alcohol is more likely to be absorbed into the nonwoven fabric than it moves to the wiping surface, and is less likely to move to the wiping surface. is there. Therefore, when the nonwoven fabric according to the present invention is used as a wiping cloth base material by impregnating with a high-concentration alcohol liquid, there is an effect that wiping traces such as traces of alcohol liquid hardly remain on the wiping surface.

  In addition, when the alcohol impregnated in the nonwoven fabric according to the present invention is one having a boiling point of less than 100 ° C., it evaporates quickly even if the alcohol liquid remains on the wiping surface. Moreover, since the alcohol concentration is 70% by mass or more, the wiping property of dirt is good and transpiration is fast. Moreover, since the alcohol concentration is less than 95% by mass, the transpiration trace of the alcohol liquid hardly remains after wiping. Furthermore, if the amount of the alcohol solution to be impregnated is 60 to 120% by mass with respect to the mass of the nonwoven fabric, various kinds of dirt such as sebum dirt can be removed satisfactorily by the action of the alcohol, and excess alcohol on the wiping surface. Becomes difficult to adhere, and the trace of the alcohol liquid hardly remains on the wiping surface.

  As a result of the above, the nonwoven fabric according to the present invention can be suitably used as a wiping substrate for removing dirt on the surface of a transparent glass such as a spectacle lens or a camera lens. Since it is hard to do, there exists an effect that it can prevent becoming difficult to see through transparent glass.

  EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to an Example. In the present invention, a non-woven fabric comprising synthetic fibers containing polyalkylene glycol as a constituent fiber has good hydrophilicity and is suitable for impregnating and retaining a high-concentration alcohol solution, which is impregnated with an alcohol solution. Based on the knowledge that when used as a wiping cloth base material, when transparent glass surfaces such as eyeglass lenses or camera lenses are wiped off, dirt can be wiped off well and wiping traces do not remain on the wiping surface. Should be interpreted as

Example 1
As the polyester polymer A, polyethylene terephthalate containing 5% by mass of polyethylene glycol having a mass average molecular weight of 6000 was prepared. This polyester polymer A had a melting point of 250 ° C. and a relative viscosity of 1.49 at 20 ° C. when dissolved in an equal amount of a mixed solvent of tetrachloroethane and phenol. On the other hand, the polyolefin polymer B has a melting point of 127 ° C. and a melt index value [measured at 190 ° C., 21.17 N (2.16 kgf) according to the method described in ASTM-D-1238 (E)] of 20 g. / 10 minutes high density polyethylene was prepared. The polymer A and the polymer B were melted and introduced into a composite spinneret. As the composite spinning hole provided in the composite spinneret, one having a shape capable of obtaining a split type composite fiber having a cross section as shown in FIG. 1 was adopted. The composite spinning was carried out so that the single-hole discharge rate was 1.3 g / min and the composite ratio [polymer A / polymer B (mass ratio)] was 1.4 / 1. A spun yarn having the shape shown in 1 was obtained. The temperature of the polymer line was 285 ° C. for polymer A, 230 ° C. for polymer B, and the spinning temperature was 285 ° C.

After the spinning yarn is cooled by a cooling device, these spinning yarns are picked up at 4000 m / min in an air soccer group arranged at a position 150 cm below the spinneret, and the split type composite length is obtained by a known opening device. After opening the fiber group, it was deposited on a moving wire mesh collecting conveyor to obtain a nonwoven web. The basis weight of the nonwoven web was about 45 g / m ² , and the fineness of the split-type composite continuous fibers constituting the nonwoven web was about 3.2 dtex. Then, this nonwoven web is introduced into an embossing device composed of a sculpture roll (unevenness roll) heated to 122 ° C. and a smooth roll, and a heat is partially applied to provide a fusion zone to obtain a nonwoven fleece. It was. This fusion zone is a zone where the split composite long fibers are fused and bonded together by the softening or melting of the polymer B. In addition, the area where heat is not applied is a non-fused area where the split-type composite long fibers are not bonded to each other and are simply accumulated. The area of the individual fused areas is 0.68 mm ² , the ratio of the total area of the fused areas to the nonwoven fleece surface area is 10.9%, and the density of the fused areas is 16.0 pieces / cm ² . there were.

Next, the nonwoven fleece provided with the fusion zone is subjected to water needling to perform split splitting of the split-type composite long fibers in the non-fused zone, and is made of the polymer A produced by split splitting. Three-dimensional entanglement was made between the ultrafine fibers and the polymer B made of the polymer B. Water needling was performed under the following conditions. That is, a high-pressure water column flow (pressure 15.68 MPa) was jetted from a die composed of a hole diameter of 0.12 mm, a hole pitch of 0.6 mm, and three rows of injection holes toward the nonwoven web. The nonwoven web was placed on a 100-mesh screen and moved at a conveyance speed of 10 m / min, and the spacing between the injection holes and the nonwoven web was 80 mm. And after giving water needling, it squeezed with the mangle roll, then dried, and the nonwoven fabric was obtained. In this nonwoven fabric, fibers made of polymer A (fineness: about 0.3 dtex) and fibers made of polymer B (fineness: about 1.4 dtex) are generated, and the fibers are three-dimensionally entangled. The basis weight was about 45 g / m ² .

Comparative Example 1
As the polyester polymer A, a nonwoven fabric having a basis weight of about 45 g / m ² was obtained in the same manner as in Example 1 except that polyethylene terephthalate containing no polyethylene glycol was used.

[Liquid retention test I]
The nonwoven fabric obtained in Example 1 and Comparative Example 1 was cut into 10 cm × 10 cm to prepare a sample. And the mass of each sample was measured and this was made into dry mass. Thereafter, each sample was put into a beaker (capacity 500 cc) containing 300 cc of an alcohol solution having an alcohol concentration of 80% by mass, and impregnated with the alcohol solution. The alcohol liquid is composed of isopropanol, ethanol, and water. When 1 minute passed after throwing in, each sample was taken out with tweezers, and after holding for 1 minute with tweezers, the mass of each sample was measured. This mass was designated as wet mass I. And the liquid retention rate I (%) was computed by the following formula.
Liquid retention ratio I (%) = (wet mass I−dry mass) × 100 / dry mass When this test was repeated three times and the average value of the liquid retention ratio I of the nonwoven fabric according to Example 1 was calculated, 367.9 %Met. On the other hand, when the average value of the liquid retention ratio I of the nonwoven fabric according to Comparative Example 1 was calculated, it was 283.7%. Therefore, it can be seen that the non-woven fabric according to Example 1 has a higher liquid retention rate of the high-concentration alcohol liquid than the non-woven fabric according to Comparative Example 1.

[Liquid retention test II]
Using the same sample as the liquid retention test I, the alcohol solution was impregnated by the same method, and each sample was taken out with tweezers. Then, a stack of four spunlace nonwoven fabrics (20 cm × 20 cm, basis weight 35 g / m ² ) composed of cotton fibers was placed on a glass plate, and each sample taken out was placed on the spunlace nonwoven fabric. Further, a four-layer spunlace nonwoven fabric similar to that described above was placed on each sample, and a load of 39.2 N / 100 cm ² was applied from the top and left for 5 minutes. Then, each sample was taken out and the mass of each sample was measured. This mass was designated as wet mass II. And the liquid retention rate II (%) was computed with the following formula.
Liquid retention ratio II (%) = (wet mass II−dry mass) × 100 / dry mass This test was repeated twice, and the average value of the liquid retention ratio II of the nonwoven fabric according to Example 1 was calculated to be 75.5. %Met. On the other hand, when the average value of the liquid retention ratio II of the nonwoven fabric according to Comparative Example 1 was calculated, it was 58.2%. Therefore, it can be seen that the non-woven fabric according to Example 1 is less likely to be squeezed than the non-woven fabric according to Comparative Example 1 even when compressed in a state impregnated with a high-concentration alcohol solution.

Wiping test examples 1-5
The sample used in the liquid retention test I was impregnated and liquid-retained with the alcohol liquid used in the liquid retention test I in the amounts shown in Table 1 to obtain a wipe. Using this wipe, wipe off the dirt on the surface of the eyeglass lens and visually check the transpiration state of the alcohol liquid and the wiping trace (including the alcohol liquid trace and the alcohol liquid transpiration trace) on the wiping surface as follows. evaluated. The results are shown in Table 1.
[Transpiration state of alcohol liquid]
(Double-circle): The alcohol liquid adhering to the wiping surface evaporates instantly.
○: The alcohol liquid adhered to the wiping surface evaporates in a few seconds.
X: The alcohol liquid adhering to the wiping surface does not evaporate within a few seconds.
[Wipe status]
A: No wiping traces (including traces of alcohol and transpiration of alcohol) remain.
X: Wipe traces (including traces of alcohol and transpiration of alcohol) remain.

Wiping test examples 6 and 7
A wipe used to impregnate and retain an alcohol solution with an alcohol concentration of 90% by mass in an amount of 80% by mass (Test Example 6) and an alcohol solution with an alcohol concentration of 95% by mass were used in the sample used in the liquid retention test I. , Using a wiping cloth impregnated and retaining liquid in an amount of 80% by mass (Test Example 7), wiping the spectacle lens in the same manner as in Test Example 1, and evaporating the alcohol liquid and wiping traces Evaluation was performed in the same manner as in 1. The results are also shown in Table 1. The alcohol solution used here is also composed of isopropanol, ethanol, and water, as in the liquid retention test I.

[Table 1]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Alcohol concentration Impregnation amount Alcohol solution Wipe trace
(Mass%) (mass%) transpiration state ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Test Example 1 80 80 ◎ ◎
Test Example 2 80 100 ◎ ◎
Test Example 3 80 120 ○ ◎
Test Example 4 80 150 × ×
Test Example 5 80 180 × ×
Test Example 6 90 80 ◎ ◎
Test Example 7 95 80 ◎ ×
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  As is clear from the results in Table 1, when the nonwoven fabric according to Example 1 was used as a wiping cloth base material and impregnated and retained with an alcohol solution to form a wiping cloth, if the amount of impregnation was too large, alcohol was applied to the wiping surface. When a large amount of the liquid adheres, the transpiration of the alcohol liquid is delayed, and the alcohol mark tends to remain on the wiping surface. Further, when an alcohol liquid having a concentration of 95% by mass is used, the trace of the alcohol liquid tends to remain. The reason for this is not clear, but it is thought that the transpiration rate of alcohol is too high and the temperature change due to heat of vaporization is too intense. Therefore, when the nonwoven fabric according to Example 1 is used as a wiping cloth substrate, an alcohol solution having an alcohol concentration of 70% by mass or more and less than 95% by mass is impregnated and retained in an amount of about 80 to 120% by mass. Is preferred.

It is the figure which showed an example of the cross section of the split type composite fiber used in this invention.

Explanation of symbols

A Polyester polymer containing polyalkylene glycol B Polyolefin polymer

Claims (7)

  A non-woven fabric for impregnating an alcohol solution having an alcohol concentration of 70% by mass or more and less than 95% by mass, wherein the non-woven fabric is composed of a synthetic fiber containing polyalkylene glycol. Nonwoven fabric for impregnation.   The non-woven fabric for high-concentration alcohol impregnation according to claim 1, for impregnating the alcohol liquid with 60 to 120% by mass.   The high-concentration alcohol-impregnated nonwoven fabric according to claim 1, wherein the alcohol contained in the alcohol liquid has a boiling point of less than 100 ° C.   The high-concentration alcohol nonwoven fabric according to claim 1, wherein the synthetic fiber is an ultrafine fiber obtained by splitting and splitting the synthetic fiber.   The nonwoven fabric for high concentration alcohol impregnation according to claim 1, wherein the polyalkylene glycol is polyethylene glycol and the synthetic fiber is a polyester fiber.   The non-woven fabric for impregnation with high concentration alcohol according to claim 1, wherein the alcohol is isopropanol and / or ethanol.   The nonwoven fabric for high concentration alcohol impregnation as described in any one of Claims 1 thru | or 6 with which a nonwoven fabric is used as a wiping cloth base material.

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