JPH045785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the color development of a fiber structure made of fibers having specific grooves on the fiber surface, which is suitable for constructing high-grade woven and knitted fabrics having a squeaky feel, silky sound, and elegant luster. This invention relates to improved resin processing methods.

Conventionally, pre-prepared silk woven and knitted fabrics made using pre-prepared threads from which sericin has been removed from raw silk through scouring have a stiff feel,
It is widely used for its silky feel, silky texture, and elegant luster.

In synthetic fibers, attempts have been made extensively to impart such excellent squeaky, crisp, silky, and glossy properties, mainly by improving the cross-sectional shape. Although it is possible to give a certain degree of shine and luster by varying the cross-sectional shape and making yarns with irregular cross-sections, especially yarns with various cross-sections such as three-lobed, five-lobed, eight-lobed, etc., It has the disadvantage that it is extremely low.

In addition to yarns with various cross sections, yarns having various cross-sectional shapes have been proposed, but these yarns do not simultaneously satisfy excellent squeaky feel, smooth feel, silkiness, and luster.

For example, Japanese Patent Application Laid-Open No. 1983-1987 describes a method for producing irregular cross-section yarn that improves the above-mentioned drawbacks of the conventional technology and has excellent squeaky feel, silky sound, and elegant luster.
165015, JP-A No. 57-5912, JP-A No. 57-5921, and JP-A No. 58-98423, the easily soluble polymer of a composite fiber consisting of two types of thermoplastic polymers with different solubility is dissolved and removed. It is extremely effective to form two or more continuous grooves in the fiber axis direction per single fiber.

Synthetic fibers, particularly polyester fibers, have excellent physical and chemical properties and are therefore widely used for clothing and industrial purposes. However, it has a serious drawback that it is inferior to natural fibers such as wool and silk, and semi-synthetic fibers such as rayon and acetate, in that it is inferior in clarity, depth of color, and especially black color development. This is because polyester fibers are dyed with disperse dyes that have a small molecular extinction coefficient and poor visibility, and also because polyester fibers have a high refractive index of around 1.7, which has a large refractive index difference with air. This is due to the fact that the incident light is inhibited from penetrating into the fiber. Furthermore, since polyester fibers are manufactured using a melt-spinning method, their smooth surfaces promote specular reflection at the interface between the fibers and air, making it more difficult for incident light to penetrate.

Conventionally, the coloring properties of these polyester fibers,
For the purpose of improving the depth of color, (1) A method in which organic synthetic fibers are irradiated with plasma in a glow discharge plasma to give the fiber surface an unevenness of 0.1 to 0.5 μm (Japanese Patent Laid-Open No. 52-99400).

(2) A method of applying a thin film of a low refractive index biological material to the fiber surface (Japanese Patent Application Laid-Open No. 111192/1983).

(3) A method of imparting a specific surface structure by subjecting polyethylene terephthalate fibers to which 0.5 to 10 weight percent of countless fine particles such as silica sol with an average particle size of 80 mμ or less are added to them by alkali dissolution (Japanese Patent Application Laid-open No.
54-120728).

etc. have been proposed.

Among these methods, method (1) requires expensive plasma discharge equipment, so there are problems such as increased costs and no significant improvement in color development can be expected.

In addition, method (2) is a method of attaching a film of a low refractive index component to the fiber surface, so it is easy to perform and the color development property is greatly improved. ) caused problems with durability.

Furthermore, in the method (3), specific vertical surface irregularities can be imparted in the direction of the fiber axis, so although the coloring property is improved to some extent, there is a limit to its effectiveness.
Moreover, it has the disadvantage of reduced gloss.

The present inventor is characterized by a fiber structure made of fibers having continuous grooves in the fiber axis direction. The present invention was arrived at after intensive research into a durable resin processing method that improves color development without impairing the squeak, silkiness, or elegant luster.

That is, the present invention has the following configuration.

(1) A method for treating a fibrous structure, which comprises treating a fibrous structure containing fibers having continuous grooves in the axial direction of the fibers with a treatment liquid consisting of a water-soluble resin, colloidal silica, and an inorganic salt.

(2) The treatment method according to claim 1, wherein the treatment is immersion treatment.

(3) The fiber structure according to claim 1, wherein the grooved fibers are made of a thermoplastic polymer and have an entrance width of 0.1 to 4μ and a depth of 0.1 to 10μ.

(4) Claim 1, wherein the water-soluble resin is one or a mixture of two or more selected from polyamide, polyurethane, and polyacrylamide.
Treatment method described in section.

The present invention can be applied not only to fiber structures made only of fibers having grooves, but also to products mixed with natural fibers and the like.

A typical cross section and side surface of the grooved fiber according to the present invention are shown in FIGS. 1 and 2, respectively.

The fiber structure referred to here refers to all forms of cotton, tow, sliver, thread, fabric, and felt.

The present invention is characterized by adding a water-soluble resin to an aqueous colloidal silica dispersion and further adding an inorganic salt to this aqueous resin liquid.

Silicon oxide particles have a low refractive index of 1.47, and arranging these particles on the fiber surface changes the optical properties of the fiber due to the coating effect of the low refractive index material and the surface roughening effect of the particles, making the color darker. , is extremely effective as a means of sharpening the image. However, silicon oxide alone causes particle migration, making it difficult to uniformly coat the fiber surface with particles, and also prevents the basic drawback that silicon oxide particles on the fiber surface tend to fall off during washing. No. However, the water-soluble resin of the present invention has a very large effect on forming a uniform silicon oxide film and improving washing resistance.

In the present invention, silicon oxide has a particle size of 0.5 to 100 mμ and is uniformly dispersed in water, preferably 10 to 50 mμ.

The water-soluble resin of the present invention is one or a mixture of two or more of polyamide, polyurethane, and polyacrylamide resins, but when silicon oxide particles are anionically charged in water, a cationic water-soluble resin is used. , or when the resin is cationically charged, it is effective to mix an anionic water-soluble resin.

Known water-soluble resins can be used in the present invention, and there are no particular limitations. Examples of polyamide resins include urea, N-alkyliminobispropylamine, and ε-caprolactam in molar ratios of 1:1:1 and 1:1:1. Polyamide urea obtained by reacting at a ratio of 1:10 Here, R: an alkyl group having 1 to 3 carbon atoms, n = an integer of 1 to 10, or N-
those obtained from alkoxymethylated products and condensates of higher fatty acids and polyalkylpolyamines,
or dialkylamino-ε-caprolactam or a copolymer of said polyamide and ε-caprolactam, etc., and a water-soluble product obtained by reacting these with epihahydrin (epichlorohydrin or epiglomhydrin, etc.) and/or benzyl chloride, formaldehyde. Cationic polyamides are particularly preferred.

Water-soluble polyurethanes include, for example, urethane polymers made of blocks of propylene oxide and ethylene oxide, or randomly copolymerized polyether diol and hexamethylene diisocyanate, or xylene diisocyanate, in which the free isocyanate groups are blocked with bisulfite. It will be done.

The amount of water-soluble resin added in the present invention varies depending on the particle size of the silicon oxide, and it is sufficient if the amount is uniformly adsorbed to the silicon oxide particles, but the mixing ratio is extremely important in the present invention. It is necessary to select a mixing amount appropriate for the diameter. For example, for silicon oxide 1 with a particle size of 7 mμ
0.2 to 1, preferably 0.4 to 0.6, for 1 silicon oxide with a particle size of 10 to 20 mμ, and 0.1 to 0.8, preferably 0.3 to 0.5, for 1 silicon oxide with a particle size of 40 to 50 mμ. 0.05~0.2, preferably 0.08~
It is better to mix 0.15% water-soluble resin. The appropriate amount of water-soluble resin seems to be determined by the surface area of silicon oxide.

By employing the above-mentioned appropriate mixing ratio, the mixture of silicon oxide and water-soluble resin can form a uniform coating on the single fiber surface.

The present invention is characterized in that the resin is water-soluble and further an inorganic salt is added.

The inorganic salt is effective in effectively adsorbing silicon oxide and water-soluble resin onto the fiber surface, and is thought to provide a so-called salting-out effect.

The inorganic salt is not particularly limited, but sodium chloride, sodium sulfate, sodium persulfate, and the like are particularly preferred. In order to more effectively adsorb silicon oxide and water-soluble resin onto fibers, the amount of the inorganic salt added is extremely important. Taking the example of sodium chloride, a resin component in which silicon oxide and water-soluble resin are appropriately mixed is extremely important. It is 0.2 to 5.0, preferably 1.0 to 2.5, with respect to 1. Anything outside this range will have very little improvement in adsorption of the resin. The effects of the inorganic salt of the present invention can be exhibited for the first time in a water-soluble resin dispersion of silicon oxide. It is thought that the analysis effect can be obtained.

The processing method of the present invention is not particularly limited, and any method that can form a thin film on the fiber surface may be used, such as the pad dry method, pad steam method, spray method, or dipping method. Depending on the depth, a phenomenon occurs where it is difficult to form a uniform thin film on the fiber surface, perhaps because the resin liquid concentrates in the grooves, so the effect of the present invention is achieved regardless of the shape of the grooves. For this purpose, a dipping treatment method is preferable, and a major feature of the present invention is that the resin can be effectively adsorbed even in low-temperature treatment of 15 to 50°C.

Furthermore, the effects of the present invention can be fully exhibited even if the present invention is applied to a fiber structure before dyeing, and then subjected to printing and dyeing.

The details of the present invention will be explained below with reference to Examples.

The present invention will be described in more detail below with reference to Examples.

Example 1 Polyethylene terephthalate (intrinsic viscosity 0.66, titanium oxide content 0.55%) and polyethylene terephthalate (98 mol%)/5- as easily soluble polymers
A mixture of copolymerized polyester (intrinsic viscosity 0.55 in orthochlorophenol at 25°C) consisting of sodium sulfoisophthalate (2 mol %) at a weight ratio of 80/20, using the above polyethylene terephthalate as the hardly soluble polymer, and spinning temperature. 295℃, spinning speed
1200 m/min, easily soluble polymer: hardly soluble polymer in a ratio of 20:80, and the easily soluble polymer was supplied in a core-sheath shape to each tip of the Y-shaped discharge hole for composite spinning, followed by a drawing speed of 300 m/min, Heat pin temperature 120℃, stretching ratio
The yarn was drawn at a factor of 3.3 to obtain a drawn yarn of 75 denier 36 filament having a triangular cross-sectional shape containing easily soluble polymer at three vertices. The length of the easily soluble polymer on the fiber surface was 1.0μ, and the distance between the points closest to and farthest from the center of gravity of the fiber was 2.5μ. Note that the dissolution rate ratio of the easily soluble polymer to the slightly soluble polymer is 4 times that of the slightly soluble polymer under the dissolution treatment conditions described later.

Using this drawn yarn, the warp yarn is twisted at 150T/M, and the weft yarn is not twisted, so the warp density is 108
Taffeta was woven at a yarn density of 92 yarns/inch and a weft density of 92 yarns/inch.

After scouring the obtained fabric, it was intermediately set at 180℃,
After alkali treatment at 100℃ with an aqueous alkali solution containing 30g of NaOH, the inlet width was 0.2μ as shown in Figure 1.
A groove with a depth of 1.9μ was formed.

Next, Dianix Black BG-FS (disperse dye manufactured by Mitsubishi Kasei Corporation) was dyed in a dye bath containing 15% OWF at a bath ratio of 1:40 for 60 minutes at 130°C, followed by reduction cleaning according to the usual method, washing with water, and drying. did.

The color development of this black dyed product was investigated. Color development was determined by the L value measured with a digital colorimeter (manufactured by Suga Test Instruments Co., Ltd.). Here, the L value represents the visual density of a color, and the smaller the L value, the darker the color.

This black dyed material is further dyed with an average particle size of 40 to 50 mμ.
4g of silicon oxide/polyamide resin in water dispersion
Add 0.4g/ and then add 6g/ of sodium chloride.
Resin processing was carried out by the following two methods using a treatment solution containing .

(1) Pad method: Squeeze with a mangle after immersing in the treatment solution
Dry at a temperature of 130°C. The resin adhesion amount determined from the change in fabric weight after drying was 0.7%.

(2) Dipping method: The amount of silicon oxide per dough weight is 4
The treated solution was collected so that the solution was %owf, and the bath ratio was 1.
The treatment time was adjusted so that the resin adhesion amount was 0.7%, and after the treatment, it was dried at a temperature of 130°C.

Here, the polyamide resin having the following structural formula was used.

The results of this treatment (L value) were as follows.

Finished dyeing Padded method Dipping method Method of the present invention 24.0 23.5 22.5 For comparison, taffeta made of thread with a triangular cross-sectional shape made only of a hardly soluble polymer was
When the grooveless fibers dyed so that the L value was the same as in the examples were treated in the same manner, there was no squeaky feeling and the gloss was highly glittery.

From the above results, it was found that the groove-formed fibers of the present invention can have a more significant effect when treated by the dipping method than by the pad method.

Example 2 The fabric of Example 1 was treated with the same resin before dyeing, then overprinted with red color and dyed at 130°C.
After applying high-temperature and high-pressure steaming for 30 minutes, washing with water and reduction cleaning, finishing was set at a temperature of 160°C.

As a result, 35.5 for the pad method and 34.5 for the immersion method.
It was found that resin processing using the dipping method had a greater effect on improving color development than the pad method.

[Brief explanation of drawings]

FIGS. 1 and 2 respectively show a cross section and a side view of a typical grooved fiber according to the present invention. Note that the concave portion at the apex of the triangular cross section in FIG. 1 and the diagonally shaded portion in FIG. 2 indicate the groove in the present invention.

Claims (1)

[Scope of Claims] 1. A method for treating a fibrous structure, which comprises treating a fibrous structure containing fibers having continuous grooves in the fiber axis direction with a treatment liquid consisting of a water-soluble resin, colloidal silica, and an inorganic salt. . 2. The treatment method according to claim 1, wherein the treatment is immersion treatment. 3. The fiber structure according to claim 1, wherein the grooved fibers are made of a thermoplastic polymer and have an entrance width of 0.1 to 4μ and a depth of 0.1 to 10μ. 4. The treatment method according to claim 1, wherein the water-soluble resin is one or a mixture of two or more selected from polyamide, polyurethane, and polyacrylamide.