JPH0639739B2 - Standing sheet and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a napped sheet comprising a core-sheath type ultrafine fiber and having a natural-feeling color.

[Prior Art] Luxury wool products are very elegant and mild and calm. This is a color effect that results from mixing several differently dyed wools. That is, it means that the more colors are mixed, the deeper the color that is natural.

On the other hand, a technique for obtaining a similar effect is provided in the artificial leather field. For example, JP-A-50-11670
The technique is disclosed in JP-A-54-10668 and the like. Although these techniques have some effects in obtaining a simple marbled product, they also have the following drawbacks.

(1) Due to the use of metachromatic polymers, the color difference between the fibers is noticeable due to the dyeing, and it is possible to obtain a fluffy, marbled color sense, and it is difficult to obtain a deep and mild natural sense color. is there.

(2) Since the dye is overlapped with the isomer dye, the dye stains on the other side, and the color developability of the polymer body cannot be fully utilized, and the substantial color-different effect cannot be sufficiently obtained.

(3) When trying to obtain a dark color, one of a large amount of dyes is precipitated and aggregated, and stable dyeability cannot be obtained.

(4) Since the isomer dye is used, reduction cleaning or soaping is required depending on the number of dyes, which is also disadvantageous in terms of cost.

(5) Since the stable adsorption temperature of the dye used is different, the temperature must be raised several times, which is detrimental to the deterioration of the fiber or the binder and the cost increase due to the extension of the dyeing time. .

It has been left unsolved despite the many drawbacks mentioned above.

[Problems to be Solved by the Invention] The present inventors finally found the present invention as a result of earnestly studying a napped sheet which does not have the above-mentioned drawbacks, has good dyeing stability and color development, and has a natural color. .

[Means for Solving Problems] The gist of the present invention is as follows.

(1) An ultrafine fiber having a core-sheath structure of 0.5 denier or less, wherein the sheath component of the ultrafine fiber is polyester obtained by copolymerizing 2.0 mol or more of 5-sodium sulfoisophthalate, and the core component Is a napped sheet composed of a polymer having a dyeing property different from that of the sheath component, and at least two or more kinds of the ultrafine fibers having a core-sheath component ratio different by 5% by weight or more are mixed, and the napped sheet has a dark and light color. A napped sheet characterized by being mixed.

(2) 5-sodium sulfoisophthalate as a sheath component 2.
At least two kinds of core-sheath type ultrafine fibers having a core-sheath component ratio of 0.5 denier or less containing a copolymerized polyester of 0 mol or more and having a fine core-sheath structure different by 5% by weight or more are spun, mixed and then napped. A method for producing a napped sheet, which comprises forming a sheet and then dyeing the napped sheet with a cationic dye.

(3) The method for producing a napped sheet according to claim (2), wherein the spinning is simultaneous spinning.

The present invention will be described in detail below.

The fiber denier used in the napped sheet of the present invention is 0.5.
Denier or less, preferably 0.01 to 0.3 denier. Above this, the texture of the sheet becomes hard and the surface touch is rough, which is inconvenient for obtaining a suedelike appearance.

The fiber used in the present invention is an ultrafine fiber having a core-sheath structure. The core-sheath type structure means a structure arranged on substantially concentric circles. Therefore, an eccentric core-sheath structure for the purpose of obtaining a crimping effect or a silky luster is not included. From the viewpoint of yarn-forming stability and processing stability, the production method is generally a sea-island type composite fiber, which is obtained by dissolving and removing sea components. For example, JP-A-54-116
The method disclosed in US Pat. No. 417 is suitable.

The combination of polymers forming a core-sheath structure has a sheath component of 5
A polyester in which sodium sulfoisophthalate is copolymerized in an amount of 2.0 mol (relative to total acid content) or more, preferably 3.0 mol or more. When the copolymerization ratio is less than 2.0 mol,
In the same bath dyeing with a cationic dye described below, it is unsuitable for changing the dye adsorption balance due to the difference in the core-sheath ratio to obtain the difference in color developability. The core component is not particularly limited as long as it has a dyeability different from that of the sheath component, but a homopolymer of a highly polymerized polyester is preferably used in consideration of the strength reinforcing effect of the sheath component.

In the present invention, in order to obtain a natural deep color, it is necessary that the ratio of the core-sheath components of the fibers to be mixed is more than 5% by weight. If it is less than 5% by weight, it is unsuitable for exerting a difference in shade in the same color system, that is, a color difference.

In order to obtain a wool-like color feeling of multi-color mixed fibers, it is sufficient to mix two, three, and four kinds of fibers having the core-sheath component ratio difference. Since it is a homochromatic polymer instead of a combination of heterochromatic polymers, it is possible to easily obtain ultrafine fibers having different core-sheath component ratios by preparing two types of polymers. In addition to the core-sheath type fibers, fibers having a thickness that does not change the texture or fibers that do not have a core-sheath structure may be mixed in a ratio that does not extremely affect the color.

The mixing direction used in the present invention is a method of separately forming staples of ultrafine fibers, and then mixing both, and a mixing method by simultaneous spinning. The former has a wide mixing ratio, but has a mixed color on the surface, and is an effective method for obtaining a product with a high degree of marbling.

Further, the latter simultaneous spinning and mixing method is disclosed in JP-A-54-116.
A method in which at least two spinnerets such as those described in No. 417 are installed adjacent to each other at the time of spinning, fibers having different core-sheath component ratios are separately spun at the same time, and the fibers are bundled, mixed and wound into a mixed staple. And a method in which fibers having different core-sheath component ratios are simultaneously spun by the same spinneret and wound into a mixed fiber staple.

In the former method, the mixing ratio may be set so that the target mixing ratio is the number of spinneret ejection holes through which fibers having different core-sheath component ratios are spun. In this case, fibers having different core-sheath component ratios spun from the die may have the same fineness, and even if a difference in fineness is imparted, the effect of the present invention is not lost. The method of setting the mixed fiber ratio in the latter case may be designed so that the number of composite fibers spun from the same spinner and having different core-sheath component ratios is the desired mixed fiber ratio. In this case, the number of island components (the number of components having a core-sheath type structure arranged in the sea component) in each composite fiber having different core-sheath component ratios may be the same or different. In short, it suffices to set the ratio of the ultrafine core-sheath fibers having different core-sheath ratios after removing the sea component to be the target mixed fiber ratio. Further, as a mixed fiber method using the same spinneret, a method of designing such that the core-sheath ratio of each island component forming the core-sheath structure in one conjugate fiber to be simultaneously spun is designed to be the target mixed fiber ratio Good.

The mixed fiber method used in the present invention is achieved by taking the above-mentioned means depending on the purpose and application. Among them, the simultaneous spinning and mixing fiber method is suitable for exerting the effect of the present invention.

The mixed fiber ratio varies depending on the core / sheath ratio, the sheath component copolymerization ratio, the type of mixed fiber and the color to be dyed, etc. In order to obtain a mellow, mild color, for example, if two types of mixed fibers are used, the mixing ratio is 70 / 30-
A 30/70 wt% range is preferred. Further, in the case of three kinds of mixed fibers, the mixed fiber ratio of the fiber having the highest sheath component ratio and the fiber having the lowest sheath component ratio is set in the range of 70/30 to 30/70% by weight.
For the total weight of seed fiber, the other fiber is 10
It is preferable to mix the fibers in the range of ˜30% by weight in order to obtain a milder natural color than the color of the two-kind mixed product. On the other hand, the colors used in the prior art are generally called marbling and are called "melange" or "heather". The former was mainly composed of dark colors and a little mixed with light colors, and the latter was mainly composed of light colors and a little mixed with dark colors, and had some effect. However, when trying to obtain a natural color without deep fluffiness, which is a feature of the present invention, by using the conventional technique, for example, when mixing the same color system with slightly different colors in the main color of dark color, Since all of the dyes are different dyes, different dyes are used, and in the same bath dyeing, dyeing agglomeration and precipitation on the high density side occur, dyeing stability is poor, and on the other hand dye stains on the fiber occur. However, there is a drawback that the color development inherent to the polymer cannot be fully utilized. In addition, when 3 types and 4 types and a heterochromatic polymer are mixed, not to mention the above-mentioned defects, it must be said that industrial stability is absolutely impossible in terms of operation stability, economic efficiency, etc. become. However,
According to the present invention, these problems can be solved at once.

The napped sheet referred to in the present invention is a non-woven fabric, a woven or knitted fabric, or a fiber sheet constituted by a combination thereof,
It has a nap. Various known techniques are used to make the napped sheet, and there is no particular limitation. The napping means uses sandpaper, sandcloth, sandnet, grindstone, steel brush, polishing brush, sandroll, swashcloth, etc., and may be appropriately selected according to the state of the sheet. Further, in the dyeing machine, a means for generating naps on the spirit by liquid flow pressure or a whetstone is also included. Further, the napped sheet may be subjected to heat treatment, sizing, ultrafine treatment, or binder addition depending on the purpose and application. This processing order is not particularly limited.

The dyeing method used in the present invention is a one-bath dyeing method using a cationic dye. The conventional dyeing method to obtain a marbled napped sheet is
Since it is a combination of different polymers, a heterochromatic dye is required, and due to problems such as the precipitation prevention of dyes and the prevention of mutual contamination of dyes, it is a one-bath dyeing method, but the adsorption temperature of the dye used in the same bath is required. It was necessary to raise the temperature over several steps, and it was necessary to carry out reduction cleaning and soaping depending on the dye species. Further, even if these means are combined, they interfere with each other and a sufficient effect cannot be obtained. However, in the fiber-mixed fiber napped sheet having a different core-sheath component ratio of the present invention, a napped sheet dyed differently with the same cationic dye at one time in the same bath and at the same temperature is obtained, which causes the conventional problems. It was solved all at once. Generally, if the polymer has the same dyeability and the same dyeing seat,
It is considered that due to the synergistic effect of the undyed core component polymer and the difference in the sheath thickness, the difference in color development is small and it is difficult to obtain the different color effect in the ultrafine fibers of 0.5 denier or less, but surprisingly, the napped sheet of the present invention has It has been found that by adopting the constitution, a different color effect having a wool-like mild natural feeling can be obtained. As a test based on the conventional idea, for example, a napped sheet using fibers having different sheath component ratios constituting the napped sheet, respectively, with the same bath ratio,
It can be confirmed that when the dyes are independently dyed under the same condition with the same concentration of the same cationic dye and the same concentration, although the respective coloring properties are slightly different, the colors themselves are not so different. Therefore, it is expected that no difference in color will occur even if dyes having different sheath ratios are dyed in the same bath. However, it has been found that when such a napped sheet is dyed in the same bath and the same concentration, an unexpectedly large difference occurs in the color developability and a different color itself is obtained. As a result of various studies as the reason for this, the dye adsorption rate of the polyester having a —SO ₃ Na group is extremely small even at a high concentration, and conversely, the dye adsorption amount and the adsorption rate balance are slightly disturbed, resulting in the coloring property. , It is thought that the colors will be different. Therefore, an important point of the present invention is how to impart these factors to the napped sheet. This unexpected effect is due to the -SO ₃ Na group copolymerization ratio of the sheath component polymer being 2.0 mol or more,
Preferably, it is more effectively exhibited in the case of 3.0 mol or more and in the mixed fiber state in which the sheath component ratio is inadequate.

The term "mixed dark and light colors" as used in the present invention means a mixture of fibers having the same color system but different coloring degrees.

The natural color as used in the present invention is not a fluffy, frosty color tone that has a clear distinctive color difference effect, but a mixture of fibers with different color development degrees in the same color system, a mild, deep color difference effect. It refers to what you have.

Next, examples of the present invention will be shown, but the present invention is not limited or restricted by them.

[Examples] Example 1 The following two kinds of sea-island type island components were prepared as polymer array staples having a core-sheath structure.

Staple (I) Island component (sheath component = A): 5-sodium sulfoisophthalate copolymerized with 2.43 mol (based on total acid content), polyethylene terephthalate having an intrinsic viscosity of about 0.58.

Island component (core component = B): Polyethylene terephthalate having an intrinsic viscosity of about 1.15.

Sea component (C): polystyrene Component ratio: A / B = 80/20% (A / B) / C = 57/43% Fiber denier: Approx. 3.8 d Fiber length: Approx. 51 mm Crimping number: Approx. 13 peaks / in Staple (II) A / B = 50/50% (all weight% unless otherwise specified)
And the others are formed in the same manner as the staple (I).

These two kinds of staples are mixed in a weight ratio of staple (I) / staple (II) = 70/30%, applied to a card / crosswrapper, and then needle punched to perform 260 g / m ² A felt having a fabric weight of This product is passed through boiling water, contracted, nipped with a mangle, dried in hot air, washed with trichlene, and then dried in hot air to give a basis weight of 210 g /
An ultrafine fiber sheet of m ² was obtained.

This sheet was dyed blue with a cationic dye. Thus, a dyed product that has undergone a single dyeing process at the same temperature and in the same bath with the same type of dye is a soft napped hair with a natural color overall that is a mixture of dark blue and blue of different colors. It was a sheet.

Example 2 The same staples as in Example 1 were used and mixed so that the mixing ratio was staple (I) / staple (II) = 30/70%, and then the same processing as in Example 1 was performed to give a basis weight. A 220 g / m ² ultrafine fiber sheet was obtained. This sheet was dyed green with a cationic dye.

Thus, the dyed product obtained by dyeing once with the same type of dye at the same bath and the same temperature has a deep and vivid color in which light greens are mixed with greens of different colors. It was a soft napped sheet.

Example 3 The same core component (B) and sea component (C) polymer as in Example 1 were used, and only the sheath component (A) was copolymerized with 5.0 mol of 5-sodium sulfoisophthalate (versus total acid content). The following staples were prepared using polyethylene terephthalate having an intrinsic viscosity of about 0.63.

Staple (I) component ratio: A / B = 80/20% (A / B) / C = 57/43% Staple (II) component ratio: A / B = 50/50% (A / B) / C = 57/43% Staple (III) component ratio: A / B = 10/90% (A / B) / C = 57/43% The fiber denier of each staple is about 3.8d, the cut length is about 51mm, and the number of crimps is It was processed so as to have about 12 peaks / in.

These staples have a mixed cotton ratio of staple (I) /
(II) / (III) = 60/10/30% was mixed. Then, the same processing as in Example 1 is performed,
An ultrafine fiber sheet having a basis weight of 260 g / m ² was obtained. This sheet was dyed in a violet system with a cationic dye.

Thus, the dyed product obtained by dyeing with the same kind of dye at the same bath and the same temperature at one time is an elegant product in which three kinds of violet-based colors with different shades of light and shade are mixed and have a mild depth. It was a soft napped sheet having a texture.

Example 4 The same staple and mixing ratio as in Example 3 were used, and after opening the cotton, needle punching was performed to obtain a felt having a basis weight of 590 g / m ² . Then, shrink treatment is performed and dried in hot air,
A sheet having a fiber density of 0.365 g / cm ³ was obtained. This sheet was impregnated with polyvinyl alcohol so as to form 23 parts of fibers, dried in hot air at 130 ° C., then immersed in trichlene for depolystyrene treatment. Then, DMF-based polyurethane was impregnated so that 45 parts of the fiber was formed and wet-coagulated. Then, DMF removal and polyvinyl alcohol removal treatment were performed in warm water and dried in hot air. This composite sheet was cut into approximately equal parts using slice M / C. The half-cut sheet is buffed on the side opposite to the sliced surface with sandpaper, and the basis weight is 230 g / m ²
Got the opportunity. This greige was dyed brown with a cationic dye. Thus, the dyed product that has undergone a single dyeing process with the same type of dye and the same temperature at the same temperature is a suede-like surface touch with a calm, mild natural sensation that is a mixture of three different shades of brown The napped sheet had a texture.

Example 5 The following two types of spinnerets (I) and (II) were placed adjacent to each other, and the same polymer shown in Example 3 was used for simultaneous spinning, focusing and winding. The mixed yarn was drawn in a liquid bath to obtain staples in which the following two kinds of staples (I) and (II) having different core-sheath ratios were mixed.

After the above-described mixed fiber staple was opened, a web was passed through a card / crosswrapper, and then needle punching was performed to obtain a felt having a basis weight of 250 g / m ² . After that, the same processing as in Example 1 is performed and the basis weight is 205 g.
An ultrafine fiber sheet of / m ² was obtained. This sheet was dyed blue using the same type of cationic dye as used in Example 1. Thus, the dyed product that has undergone one dyeing process with the same dye and the same bath and the same temperature is in a "deep" state better than that in Example 1, in which blues of different colors are mixed in dark blue, Moreover, it was a soft napped sheet with a soft texture that exhibited a mild, deep color throughout.

Example 6 The discharge holes of the die are concentrically arranged in the inner row of 12 holes and the outer row of 1
8 holes, a total of 30 holes are used, and 3 holes out of 12 holes in the inner row and 6 holes out of 18 holes in the outer row have the same core-sheath ratio.
Using the same core-sheath composite spinneret in which 1 hole had the same core-sheath ratio, and 9 holes and 21 holes were equally divided and arranged in the inner and outer peripheral rows, the same polymer as in Example 3 was used for spinning. The obtained mixed fiber was drawn in a liquid bath to obtain a mixed fiber staple shown below.

The above mixed fiber staple was subjected to the same processing steps as in Example 5 to obtain a basis weight 220 g / m ² ultrafine fiber sheet. This sheet was dyed blue using the same type of cationic dye as used in Example 5. Thus, the dyed product that has undergone one dyeing process with the same dye and the same bath and the same temperature has a mixture of dark blue and blue of different colors.
It was a soft napped sheet with a better texture and a milder, deeper and calm color throughout.

[Effect of the Invention] According to the present invention, a mixture of dark and light colors can be obtained by the same bath dyeing of the same dye, and the dyeing stability, light emitting property, and cost which the conventional technique for producing a marbled napped sheet has It is possible to solve the above problems and obtain a napped sheet having a natural and calm and mild color.

Since the napped sheet of the present invention has a natural color, it can be effectively utilized particularly in the field where color is important, such as for clothing, furniture, interiors, and wall coverings.

Claims (3)

[Claims] 1. An ultrafine fiber having a core-sheath structure of 0.5 denier or less, wherein the sheath component of the ultrafine fiber is a polyester obtained by copolymerizing 2.0 mol or more of 5-sodium sulfoisophthalate, A napped sheet in which a core component is composed of a polymer having different dyeability from that of a sheath component, and at least two or more kinds of the ultrafine fibers having a core-sheath component ratio different by 5% by weight or more are mixed, and the napped sheet is A napped sheet characterized by a mixture of dark and light colors. 2. A sheath component containing 0.5-sodium sulfoisophthalate of 0.5 mol or more copolymerized polyester.
5% by weight of core-sheath component ratio of ultrafine core-sheath structure of denier or less
A method for producing a napped sheet, which comprises spinning at least two different kinds of core-sheath type ultrafine fibers different from each other as described above, mixing them, forming a napped sheet, and then dyeing the napped sheet with a cationic dye. 3. The method according to claim 1, wherein the spinning is simultaneous spinning.
The method for producing a napped sheet according to the item (2).