JPH0242938B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a fiber structure with a roughened surface and a method for producing the same, and in particular to a fiber structure that dramatically improves the depth of color of dyed products, and also provides a new texture with a more squeaky feel than silk. It is an invention related to things. The present invention relates to a technology for roughening the surface of fibers, and this invention particularly improves the color development and texture when applied to melt-spun hydrophobic synthetic fibers such as polyester synthetic fibers. Since the improvement effect is remarkable, this specification describes the improvement effect on the coloring properties and hand of synthetic fibers as an example. However, as will be easily understood below, the principle of the present invention is not limited to improving the color development and texture of synthetic fibers, but also applies to synthetic fibers other than polyester synthetic fibers in terms of surface roughening technology for fibers in general. It is clear that this can also be applied to natural fibers. Although various techniques for increasing the depth of color and improving the texture of various fibers have been studied, no technology has been established that can be applied to all types of fibers, and such a technology has been long-awaited. Conventionally, various organic synthetic fibers, especially melt-spun synthetic fibers, have a unique waxy feel and mirror gloss due to the smoothness of their fiber surfaces, and they have problems such as not being able to obtain the depth of color compared to wool, silk, etc. It had drawbacks. Normally, roughening the fiber surface is thought to be a means of improving gloss or changing the texture, and fine particles such as titanium oxide are added to eliminate the luster, but this method only eliminates the luster. It is well known that color development deteriorates. This color development, especially the depth and clarity of the color, is necessary as a material condition for any field of use of textiles, but it is especially essential for black-dyed products such as formal wear. The reality is that it is difficult to obtain black-dyed products with deep color and clarity. In particular, polyester synthetic fibers are the most commonly used due to their excellent functionality.
As mentioned above, there are problems to be solved in terms of color development, and there has been a particular demand for products with excellent color depth and clarity. Various techniques have been published to solve the above-mentioned problems with synthetic fibers. The present inventors have also previously published a technique in which a polyester fiber containing inorganic fine particles is etched with alkali to form specific irregularities on the fiber surface, and the uneven rough surface produces a darkening effect, such as in JP-A No. 55-107512. I proposed it. In addition, senior researchers published a technique in JP-A No. 52-99400, in which organic synthetic fibers are irradiated with glow discharge plasma to form specific irregularities on the fiber surface, and these irregularities produce a darkening effect. has been done. The former is a technology that can provide an excellent darkening effect that cannot be achieved with conventional polyester fibers, but the drawback is that the gloss decreases, making it difficult to obtain a glossy darkening effect. The latter, which forms the basis of the present invention in terms of manufacturing means, relates to a technique of plasma irradiation to ordinary synthetic fibers, that is, synthetic fibers that do not contain fine particles, and the resulting synthetic fibers Although the color development property is improved to a certain degree, it is still not satisfactory compared to the fiber obtained by the former method, and furthermore, the processing time is longer, and the processing speed is not increased, which poses a problem in terms of cost. Regarding these prior art, the present inventors
First, fine particles that serve as a means of shielding against plasma are uniformly dispersed and contained in synthetic fibers as much as possible, and the synthetic fibers in which the fine particles are dispersed and contained are irradiated with low-temperature plasma. The parts of the matrix polymer that are not etched are etched by plasma to form recesses, and the parts of the matrix polymer that are shielded by the fine particles are not etched together with the fine particles and form convex parts, resulting in the formation of a large number of fine uneven structures on the fiber surface. proposed an invention that would This invention (hereinafter referred to as the "prior application") is an invention that can provide even more excellent glossy color depth and color clarity due to the difference in manufacturing method from the above-mentioned first known technology. Even with respect to the known technique No. 2, the effect of improving the deep color obtained is far more excellent than could have been expected. However, neither this prior application nor the products obtained by the first known technique are yet fully satisfactory with respect to the friction durability of the products. In addition, in terms of the manufacturing process, the previous application disclosed that it was possible to avoid agglomeration of fine particles, create a polymer in which fine particles were uniformly dispersed and contained in a large amount, and manufacture practical fibers from the polymer. It requires various restrictions and advanced technology, and can only be applied to synthetic fibers. Furthermore, in this method, it was necessary to further shorten the plasma irradiation time for forming irregularities on the fiber surface. The present invention relates to an invention that has the same effect as the earlier invention with respect to the first and second known techniques, and also solves the above-mentioned unsatisfactory points of the earlier invention. That is, the first aspect of the present invention is a fiber structure obtained by irradiating a fiber structure with fine particles, which are more inert than the polymer matrix constituting the fiber, attached to the fiber surface in a low-temperature plasma, and Therefore, the parts of the polymer matrix that are not shielded by the fine particles are etched by the plasma and form concave parts, and the parts that are shielded by the fine particles are not etched together with the fine particles and form convex parts, forming unevenness on the fiber surface. ,
The unevenness is such that the distance between the centers of adjacent protrusions is
It is a roughened fibrous structure having a diameter of 0.01 to 1 micron and 1 to 200 protrusions per square micron. The second invention is to attach 0.01 to 10% by weight of fine particles with an average primary particle size of 0.5μ or less to the fiber surface, which are more inert than the polymer matrix constituting the fiber in low-temperature plasma. This is a method for producing a roughened fibrous structure in which unevenness is formed on the fiber surface, including a step of irradiating the fibrous structure with the fine particles adhered to low-temperature plasma. The present inventor has discovered that the effect of the fiber structure obtained by the present invention is superior in friction durability compared to the effect of the structure obtained by plasma irradiation on the fine particle-containing fiber structure shown in the earlier application, and The mechanism behind the fact that it has a texture that is more squeaky than silk and has excellent color development has not been fully elucidated. However, we believe that the difference between the present invention and the prior application can be explained as follows. The principle of the invention is illustrated by the schematic diagrams in FIGS. 1a and 1b. 1 is a surface layer portion of the fiber, and 2 is a fine particle that covers and adheres to the surface of the fiber. The fibers of the present invention can be produced as shown in FIG. 1b by irradiating the fibers shown in FIG. 1a with plasma.
The portions of the polymer substrate that were coated with microparticles remained unetched, indicating that the portions of the polymer substrate that were not coated with microparticles were etched to a uniform depth. What should be noted in the present invention is that the fine particles to be deposited are located at almost the same height with respect to the polymer matrix portion, and as a result, the fine particles that remain unetched are etched from the position and form the recesses. The depth D to the surface of the grown substrate is a substantially uniform depth in all concave portions (in other words, a substantially uniform height in all convex portions). On the other hand, FIGS. 2a and 2b are examples of the case of the prior application, and are schematic diagrams in which fiber a, in which fine particles 2' are dispersed and contained in a fiber polymer matrix, is irradiated with plasma. In this case, since the fine particles are dispersed in the polymer matrix, the fine particles are located at uneven heights in the polymer matrix. Therefore, if such a fiber is irradiated with plasma, the depth D from the position of the fine particles that appear on the fiber surface due to plasma irradiation to the substrate surface where the fine particles are removed and is etched to form a recess will be uneven. It is.
In addition, since the positions of the fine particles are irregular and the polymer matrix located on the surface layer from the fine particles is etched and scattered by plasma irradiation, compared to the case of the present invention, when compared with the same plasma irradiation time, the average The depth of the concave portion (expressed conversely, the height of the convex portion) becomes smaller. In other words, the unevenness formed has a uniform depth (height) and the depth (height) has a more sufficient depth (height), so it satisfies friction durability, texture, and color development. It is thought that this can be obtained. The object of the present invention is not limited to synthetic fibers as described above, but also includes natural fibers such as wool, cotton, linen, and silk, semi-synthetic fibers such as acetate, and recycled fibers such as rayon. Synthetic fibers include polyester-based, polyamide-based, acrylic-based, polyurethane-based, and other synthetic fibers, but synthetic fibers include those that are partially copolymerized, blends of two components, and those that are bonded together. But that's fine. It may also contain surfactants, matting agents, pigments, and the like. The fiber structure of the present invention includes those composed of the above-mentioned fibers alone or a composite/mixture of two or more types of fibers, and is not limited to thread products such as tows, filaments, and yarns. Naturally, it may be a knitted fabric or a woven fabric made by knitting or weaving the yarn, or it may be a nonwoven fabric, and is meant to include all forms of cloth-like two-dimensional objects. Convexities made of fine particles existing on the surface of the fiber matrix are observed and measured using photographs taken with a scanning electron microscope magnifying the fiber surface more than 10,000 times. I found it to be very effective. Here, this unevenness means that the distance between the center (or near the center) of a convex part and the center (or near the center) of the next convex part is changed about 30 locations along the fiber axis direction in the above electron micrograph. This is the measured and averaged value. If this value is smaller than 0.01 micron, there will be little deep coloring effect on the dyed product, and conversely, if it is larger than 1 micron, there will be no darkening effect. Therefore, the unevenness is
A range of 0.01 to 1 micron is preferred, and 0.1
~0.5 micron is more preferred. Furthermore, it is preferable that the number of these unevenness is 1 to 200 per 1 square micron. This number was also measured by taking a photograph of the fiber surface magnified 10,000 times or more using a scanning electron microscope, and counting the number of protrusions present within a square with sides of 1 micron. When this number is 200 or more, the shape of the unevenness becomes too small and the color deepening effect is small.
Preferably it is 3 to 100 pieces. As for the manufacturing method, the present invention involves first attaching fine particles onto the fiber surface of a fiber structure, and then subjecting the fiber structure to which the fine particles are attached to a low-temperature plasma treatment before or after dyeing. can get. It is important that the fine particles in the present invention are more inert than the polymer substrate in low-temperature plasma, and include silicon-containing inorganic particles, inorganic fine particles made of oxides of metals from Group Group of the periodic table, and/or salts thereof; Fine particles selected from the group consisting of aluminum oxide, thorium oxide, and zirconium oxide and having an average primary particle diameter of less than 0.5 micron are used, more preferably 0.2 micron or less, and still more preferably 0.07 micron or less.
Below 0.07 microns and above 0.03 microns, the dyed material irradiated with low-temperature plasma tends to take on a slightly bluish tinge, while below 0.03 microns it tends to take on a slightly reddish tinge. Furthermore, it is thought that the concave portions are caused by fine particles remaining without being blown away by the plasma irradiation, as described above, and the polymer matrix taking a granular form with the remaining fine particles as cores, thus forming the convex portions. The type of fine particles used also affects the darkening effect,
Among the above-mentioned fine particles, those having a low refractive index are preferable, and in this respect, silica is most preferable. Due to its dispersibility, fine particles that are dispersed in colloidal form are best used.
It is not limited to this. A commonly used resin processing method can be used to apply the fine particles to the fiber surface.
For example, a resin liquid is applied to a fiber structure by a method such as padding, spraying, or printing, and then adjusted to an appropriate adhesion amount using a mangle or the like, and then applied to the fiber surface by dry heat or wet heat treatment. If it is desired to strengthen the adhesion between the fine particles and the fibers, the adhesive resin can be applied at the same time as the fine particles are attached, or after the fine particles are attached. As this adhesive resin, a water-dispersed emulsion is easily used, and when the adhesive resin is attached at the same time as the fine particles, it may be a combination that does not coagulate with the colloidal material of the fine particles when mixed. For example, when colloidal silica is used as the fine particles, anionic or nonionic resin emulsions are preferred since cationic resin emulsions tend to aggregate with colloidal silica. Of course, a finishing agent such as an antistatic agent may be included in the mixed system of the fine particles and the adhesive resin, and if the adhesive resin is applied after the fine particles are attached, these finishing agents may be contained in either. . However, if more adhesive resin is applied than necessary for the amount of fine particles,
Since the excellent squeaky feeling of the present invention is likely to be impaired, the ratio of the amount of adhesive resin to the amount of fine particles is 1.
It is desirable to make it smaller. Furthermore, as a method for imparting adhesion to the fibers of fine particles, it is also effective to apply plasma irradiation after the fine particles are attached, and then apply an adhesive resin. One of these methods is to attach an adhesive resin by plasma polymerization. This method has the advantage that it is possible to significantly improve durability, and at the same time, the process can be a dry process of low-temperature plasma irradiation and plasma polymerization. There are two methods for forming a resin by plasma polymerization: a method in which monomers are introduced with radicals remaining after plasma etching, and a method in which monomers are introduced under discharge conditions after plasma etching and then plasma polymerized. The adhesive resin that can be plasma-polymerized is preferably one that has a relatively low boiling point and is volatile at room temperature. Examples of such substances include acrylic acid, methacrylic acid, or esters thereof, silicon compounds, and fluorine compounds. As mentioned before, the mechanism of unevenness formation in the present invention is that the surface portion of the polymer substrate that is not shielded by fine particles is scattered by plasma irradiation and forms concave portions, but the fine particles attached to the substrate surface are not shielded by plasma irradiation. It is thought that the protrusions with the fine particles as the core are formed by remaining on the surface of the substrate without scattering even when the particles are scattered, and by leaving a portion of the substrate shielded by the fine particles. That is, it is thought that the fine particles deposited on the surface of the substrate act as a shield for the substrate, and the portions without the shield are sequentially etched into the interior of the substrate by the plasma. Therefore, based on the above idea, on the fiber surface,
In order to form many irregularities of a limited size, it is considered to be extremely important to have as many fine particles as possible as uniformly as possible on the surface of the fiber matrix. However, at the same time, if the layer of fine particles serving as a shield is thicker than necessary, etching into the interior of the substrate will be inhibited and the texture will be impaired, so it is preferable that the layer be as thin as possible. In this respect, the amount of fine particles attached to the fiber surface is preferably 0.01 to 10% by weight, more preferably 0.05 to 2% by weight, based on the fiber. The amount of adhesion
If it is less than 0.01%, the effect of improving color development and texture will be small, and if it exceeds 10%, the texture will be significantly impaired. Plasma is a state in which high energy is given to a substance, causing its molecules or atoms to dissociate and become a gas containing positive ions and an approximately equal number of anions or electrons in addition to neutral atoms. To tell. Usually, low-temperature plasma is generated by applying high voltage by low frequency, high frequency, or microwave to a gas atmosphere under reduced pressure of 10 Torr or less. The generated excited atoms, ions, electrons, etc. act on the surface of the polymer substrate, etching the surface. As the gas for generating low-temperature plasma, for example, oxygen, air, nitrogen, argon, olefin, etc. are preferably used. The conditions for low-temperature plasma treatment include equipment type, shape, gas type, flow rate, degree of vacuum, output, and treatment time, etc., which are selected appropriately depending on the material, composition, shape, and desired degree of darkening of the target fibers. There is a need to. For example, in the article obtained by the present invention, it is not necessarily necessary that the entire front and back surfaces of the fiber structure be textured, and in some cases, only one surface may be textured. Therefore, in that case, it is only necessary to make the fiber surface exposed on one side uneven, and this is done by appropriately selecting plasma treatment conditions. Regarding air, oxygen, and argon as gases used to generate low-temperature plasma, in terms of color deepening effect, the order is oxygen > air > argon, and the type of gas used also affects the effect. I understand. Furthermore, when the gas flow rate was varied while keeping the degree of vacuum constant, it was found that the etching rate had a large effect on the gas flow rate. In addition, the plasma treatment itself may be performed either before or after dyeing the fibers, but methods that are performed before dyeing may deform the unevenness formed on the fiber surface during the subsequent dyeing process, so this is a disadvantage. It is preferable to carry out this after dyeing without fear. In addition, the present invention provides a method of coating a part of the irradiated surface of the fiber structure with a coating other than the adhered fine particles, creating a part to be irradiated with plasma and a part not to be irradiated with plasma, and performing low-temperature plasma irradiation. The pattern and color of the covered part can be changed to the pattern and color of the uncovered part. In this method, the boundary between the covered part and the non-covered part is very clear,
It can give unique effects to dyed materials. Further, in the present invention, as the fibrous structure to which the fine particles are attached, a structure made of fibers whose fibers have been roughened in advance can be used. This fiber structure made of pre-roughened fibers can be produced, for example, by etching the polyester fiber pre-contained with fine particles shown above as the first known example using an alkaline solution to form specific irregularities on the fiber surface. Structures made of polyester fibers made of polyester fibers, or fiber structures made of synthetic fibers prepared by plasma etching synthetic fibers pre-contained with fine particles as shown in the example of the prior application mentioned above to form specific irregularities on the fiber surfaces. are mentioned as typical examples, but the structure is not limited to these roughened fiber structures. Among synthetic fibers, polyester fibers are the worst in the depth and clarity of dyed colors, but as described above, the technology of the present invention has a remarkable effect of improving the degree of color deepening on polyester fibers, and It can be said that this is a technique that is particularly effective for fibers. In this case, the polyester-based polymer is defined as having at least about 75% of its repeating structural units.

[Formula] (where -G- is a divalent organic group containing 2 to 18 carbon atoms and connected to the adjacent oxygen atom through a saturated carbon atom) is a glycol dicarboxylate repeating structural unit such as It is. The terephthalate group may be the only dicarboxylate component of the repeating structural unit, or about 25% of the repeating structural unit.
It may also contain other dicarboxylates such as adipate, sebacate, isophthalate, bibenzoate, hexahydroterephthalate, diphenoxyethane-4,4'-dicarboxylate, 5-sulfoisophthalate groups. Glycols include ethylene glycol, tetramethylene glycol, hexamethylene glycol,
Polymethylene glycols such as, branched chain glycols such as 2,2-dimethyl-1,3-propanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, or mixtures thereof can also be used. If desired, up to about 15% by weight of higher glycols such as high molecular weight polyethylene glycols can also be used. Various other substances such as matting agents, gloss improvers, anti-tarnish agents, etc. may also be added to the polymerization mixture if desired. As understood from the above explanation, the present invention aims to achieve the intended purpose by giving the fiber surface a unique structure. It goes without saying that it can be applied to fiber structures made of a mixture of one or more types of synthetic fibers, as well as fiber structures made of composite fibers in which the fiber itself has a core-sheath structure or a dorsal-ventral structure. It is. Furthermore, the present invention can be made into a shape similar to a pentagon or hexagon by high-order processing such as false twisting and crimp processing,
Trilobal, T-shaped, and 4-shaped fibers are produced by the irregular cross-section nozzle during spinning.
Needless to say, it may be used in a multi-lobed shape such as a leaf shape, a five-lobed shape, a six-lobed shape, a seven-lobed shape, an eight-lobed shape, etc., and various cross-sectional shapes. The false twisted yarn according to the present invention exhibits the effect of reducing glitter. Therefore, it is advantageous in that it also exhibits an anti-glitter effect on the POY DTY false twisted yarn obtained by high-speed spinning. Next, the present invention will be explained with reference to examples, but the present invention is not limited to the following examples. As is common knowledge to those skilled in the art, structures made of polyester fibers contain titanium dioxide in the fibers to make the structure matte and to improve the texture of the structure. For this reason, it has become a common practice to carry out weight reduction processing using an alkaline solution. In the following Examples and Comparative Examples of the present invention, when the target fiber material is polyester fiber, the present invention is applied to a structure using normally used semidal fibers and subjected to weight reduction treatment as described above. Although the embodiments are mainly disclosed in which the present invention is applied, it is obvious that the present invention does not necessarily have to be applied to such a fiber structure. A series examples and comparative examples A polyethylene terephthalate polymer with an intrinsic viscosity [η] of 0.69 to which 0.45% by weight of titanium dioxide with an average primary particle diameter of 200 millimicrons is added (this is the TiO _2- containing polymer used to make the so-called semi-dull polyester fiber mentioned above). polyester polymer) and
A polyethylene terephthalate polymer with an intrinsic viscosity [η] of 0.69 containing no particulates such as titanium dioxide was produced using a normal manufacturing method, and each polymer was spun and drawn using a normal method to form a 75 denier/36 filament. Each fiber with a circular cross section was obtained. Next, these filaments were combined into 150 denier threads for 2100 times/S.
Perform actual twisting of twisting and Z twisting, and after heat setting, warp yarn,
It was used as a weft to create chilimenji yosetsu fabric. This fabric was embossed and heat set, and the weight loss rate was 40g/40g/aqueous sodium hydroxide solution, which is a common solvent for silica and polyester, at 98°C.
The weight was reduced to 25%. Later, as a dye,
Kayalon Polvester Black G- manufactured by Nippon Kayaku Co., Ltd.
SF at 12% owf, surfactant Tohosalt TD manufactured by Toho Chemical Co., Ltd. as a dispersant, 0.5 g/, and Ultra Mt-N ₂ (mixture of acetic acid and sodium acetate) manufactured by Daiwa Chemical Industry Co., Ltd. as a PH adjuster, 0.7 g/ was added and dyed at 135°C, and dyed at 80°C for 10 minutes with 1 g of hydrosulfite, 1 g of caustic soda, and 1 g of nonionic activator.
The product was reduced and washed for several minutes to obtain a black dyed product. These black-dyed fabrics have an average primary particle size of 45
Millimicron (mμ) colloidal silica was deposited, and various silica-deposited fabrics were created by varying the amount of colloidal silica deposited and the presence or absence of adhesive resin. Colloidal silica was attached using the Patsudo dry method. The various fabrics obtained were placed in an internal electrode type plasma device (electrode area 50 cm ² ), and the frequency was 13.56 MHz.
Using oxygen and air as introduced gas, vacuum degree 0.05~
Plasma irradiation was performed for 1 to 5 minutes at 1Torr and 50W output. The color density of the obtained product was measured using a self-recording spectrophotometer manufactured by Hitachi, Ltd. The depth of color of a dyed product is indicated by the L ^* value of L ^* a ^* b ^* , and the smaller the value, the greater the darkening effect. As can be seen from A-1 and A-3 in Table 1, when plasma irradiation was performed without fine particles being attached to the fiber surface, the decrease in L ^* was small and the darkening effect was small. Furthermore, when the fiber surface in this case was observed using a scanning electron microscope, it was found that long ridge-like irregularities were formed in a direction perpendicular to the fiber axis direction. It is understood that when silica sol is attached to the fiber surface and plasma irradiated as in the case of A-2, A-4 to A-15, the L ^* value decreases significantly and the darkening effect increases. . When the fiber surface in these cases is observed using a scanning electron microscope as described above, the distance between the centers of the protrusions is 0.01 to 1μ, and there are 1 to 200 protrusions per square micron (1μ ² ). , an uneven structure with no directionality was formed. A
From -4 to A-6 and A-13 to A-15, it is understood that a sufficient effect is already expressed even when the amount of silica attached is 0.01% by weight, and it is also understood that a more suitable range exists. . Also A-6 to A-8
It can be seen that as the irradiation time increases, the L ^* value decreases significantly and the darkening effect increases. Especially A
-8, the resulting fabric exhibited velvet-like color development. A-9 and A-10 are examples with adhesive resin attached, and the dark color effect has improved in both cases.
Washing resistance is improved compared to, for example, A-6, which does not have adhesive resin attached, but A-10 has a slightly higher amount of adhesive resin, so the resulting fabric has a slimy feel, which is preferable. It wasn't something. A-
11, A-12 is another example of attaching adhesive resin,
In this case as well, there is a deep color effect and the washing resistance is improved.

【table】

[Table] B Series Examples Commercially available wool fabrics, rayon fabrics, and black-dyed products of blended fabrics of polyester and triacetate were each coated with 0.5% by weight by pad-dry method and plasma irradiated. B-1 to B-3 in Table 2
As shown in , it can be seen that each fabric has an even deeper color effect. In addition, the surface of each fiber in this case was observed using a scanning electron microscope, and it was found that a concavo-convex structure was formed with a distance between the centers of convexities of 0.01 to 1μ and 1 to 200 convexities per square micron. .

【table】

[Table] C Series Examples and Comparative Examples The polyethylene terephthalate polymers used in A series A-3 to A-14 and each polyethylene terephthalate polymer containing silica and having an intrinsic viscosity [η] of 0.69 were prepared. The silica-added polymer is prepared by mixing an aqueous silica sol with an average primary particle size of 45 millimicrons and a concentration of 20% by weight in ethylene glycol at room temperature, stirring thoroughly, mixing with terephthalic acid, and directly polymerizing it to obtain a silica-containing polymer. By varying the amount of aqueous silica sol added, polyethylene terephthalate polymers with different intrinsic viscosities [η] of 0.69 and different amounts of silica were obtained as shown in Table 3. Using these prepared polymers, fibers were made under the same conditions as in the A series, and a chillimendiyosette fabric was made from the fibers, subjected to weight reduction treatment, and dyed. Table 3 shows the effects of the particle size of the fine particles attached to this black-dyed fabric, the type of fine particles attached, and the results when the amount of fine particles added to the polymer was increased. For C-1 to C-4, the finer the average particle diameter of the particles to be attached, the smaller the L ^*
It can be seen that the decrease in color is large, and the darkening effect is greatly improved. In addition, in the case of C-1 with a particle size of 15 mμ, the color is slightly reddish black, and in the case of C-1 with a particle size of 45 mμ.
In the case of 2, the color was black with a slight bluish tinge. It is shown that silica, which has a relatively low refractive index, is preferable as the type of fine particles to be deposited. By mixing silica into polymers using C-9 to C-14 to make fibers, and then reducing the fibers with alkali, a deep coloring effect can already be observed, especially when the amount of silica added increases. It is shown that the roughening of the fiber surface due to the alkali treatment becomes more apparent, and the resulting deep coloring effect is significantly improved. Furthermore, it has been shown that by further coating these black-dyed products whose surfaces have been roughened in advance with fine particles and irradiating them with plasma, the color deepening effect is further improved in accordance with the initial degree of surface roughening. Further, C-15 is an example in which plasma irradiation was performed without coating microparticles, and is an example corresponding to the earlier application described above in the main text. In this case, the fiber has been subjected to alkali reduction treatment by mixing 3% of fine particles into the fiber.
It already has a good deep color effect to some extent, but when this object is irradiated with plasma, the L ^*
The decrease in value is smaller than in the case of C-12, which differs only in that fine particles are attached to the surface.

【table】

[Table] D Series Examples and Comparative Examples This series of examples shows that the present invention can be applied to dyed products of any color other than black and to dyed products that are a combination of two or more colors. The configuration and effects are shown in Table 4. The L ^* value is an indicator of the lightness of black,
Lower brightness means black is darker, but for colors other than black, higher saturation means black is darker.
It indicates the vividness of the color, and the saturation of the color cannot be quantified as reliable as the L ^* value, so in this specification, the vividness of the color is expressed as follows. Evaluation is done by visual judgment. The squeakiness was also evaluated based on the feel.

[Table] A polyethylene terephthalate polymer was prepared using a conventional manufacturing method in exactly the same manner as in the A series examples, and a 50 denier (dr)/36 filament (f) and a 50 denier (dr)/36 filament (f) and A drawn yarn of 75 dr/36 f was prepared. Using this drawn yarn, flat feather doubles, twill feather doubles, palaces, lily pads, and chiffons were prepared according to conventional manufacturing methods and specifications, and weight reduction processing using an alkali was performed on each yarn. Each of the structures obtained above was used as a starting structure. D-1 to D-4 in Table 4 show that plasma irradiation alone does not have the effect of the present invention, that fine particle attachment alone has little effect, and excellent effects can only be obtained by plasma irradiation with fine particles attached. It will be done. In particular, the flat feather doublet obtained in D-4 was glossy and bright in color, and there was a significant difference compared to D-1 to D-3. It was also extremely superior in terms of squeaky feel, with a unique squeaky and fluffy feel that was better than that of silk. D-5 is the above C-12, C-15
In this example, the same polymer as above was used as the drawn yarn to make a flat feather doublet, and a weight loss treatment with an alkali was performed. was lackluster. D-6 is an example in which adhesion of adhered fine particles was strengthened with modified polyvinyl alcohol, and it had better durability against washing in terms of gloss, color, and texture than D-4. D-7 to D-10 are examples of Aya Habutae, and D-8 to D
-10 was significantly superior in gloss and color clarity compared to D-7, and at the same time had a more squeaky feel and a texture better than silk. In addition, D-9 and D were produced by plasma polymerization of methyltrimethoxysilane and C ₂ F ₄ gas.
-10 showed superior washing durability compared to D-8, and the gloss, color, and texture did not change appreciably after 50 washes. D-11 to D-14 are examples of palace, porcelain, and chiffon, and the products of the present invention, D-12 to D-14, had such bright colors and a squeaky feel that it was hard to believe that they were made of polyester.

【table】

[Table] E Series Examples and Comparative Examples The examples in this series are examples in which the type of structure or the type of fiber material constituting the structure is changed, and the structure and effects are shown in Table 5. Polymers E-1 to E-4 are the polymers used in the A series, and are spun using a conventional method.
A drawn yarn of 100 dr/48 f was prepared, subjected to false twisting, and then a Kasidos fabric or Tolomatsu fabric was fabricated according to a conventional method. Among E-1 to E-4, E-2 and E-4, which were subjected to plasma irradiation with fine particles attached to the fiber surface, had a lower L ^* value compared to E-1 and E-3, which were subjected to plasma irradiation without fine particles attached. The reduction was large, the degree of glitter was also reduced, and the degree of black darkness was even greater than that of wool fabrics. E-5 to E-8 use polybutylene terephthalate fiber or nylon fiber as the fiber material, and use each drawn yarn of 40 dr/24 f.
This is an example of a tric coat knitted fabric. In this example as well, E-6 or E-8 had a brighter, glossier color than E-5 or E-7, respectively, and the sense of luxury was further enhanced. E-9 to E-10 use polyethylene terephthalate fiber copolymerized with 2.5 mol% of sulfoisophthalic acid as the fiber material, and their 50 dr/
This is an example of a satin fabric made from 36f drawn yarn using a conventional method. In this example, compared to E-9, E-10 has a brighter color that retains the unique luster of satin fabrics, has a squeaky texture, and loses the waxy feel unique to melt-spun fibers, giving it a silk-like appearance. It became a texture. E-11 to E-13 are made from the same polyethylene terephthalate polymer as E-1 to E-4.
This is an example of making a drawn yarn of 75 dr/36 f, twisting it, and making it into a crepond jersey using a conventional method.
In the case of E-12 and E-13, in which fine particles were attached to the fiber surface and irradiated with plasma, compared to the case of E-11, which was irradiated with plasma without fine particles attached, both became significantly darker black, and rayon jersey. Ozets,
Wool oyster or triacetate/
The color was darker than that of the polyester blend.
In addition, in the case of E-13, in which a silane coupling material was used as the adhesive resin, the washing durability was improved compared to the case of E-12. Furthermore, according to the observation of the fiber surface using a scanning electron microscope, each comparative example had long ridge-like unevenness oriented in a direction perpendicular to the fiber axis direction, whereas each of the examples The fiber surface has fine unevenness with no directionality, and the distance between the centers of the convexities is 0.01 to 1μ, and the density is 1 to 1μ per square micron.
There were 200 protrusions.

【table】

【table】 [Brief explanation of drawings]

FIGS. 1 and 2 are schematic diagrams illustrating the principle of generating unevenness. That is, Fig. 1 is a schematic diagram of the case where the fiber surface is coated with fine particles that serve as a plasma shield and the fiber is irradiated with plasma, and Fig. 2 is a schematic diagram of the case where the fine particles are dispersed and contained in the fiber matrix. FIG. 3 is a schematic diagram of the case where the fiber is irradiated with plasma. 1...Fiber surface layer portion, 2,2'...Fine particles.

Claims (1)

[Scope of Claims] 1. A fiber structure obtained by plasma irradiation of a fiber structure in which fine particles, which are more inert than the polymer matrix constituting the fiber, are attached to the fiber surface in a low-temperature plasma, The portions of the substrate that are not shielded by the fine particles are etched by plasma to form concave portions, and the portions that are shielded by the fine particles are not etched together with the fine particles and form convex portions, forming unevenness on the fiber surface. The center-to-center distance between adjacent convex portions is 0.01 to 1 micron, and the convex portion is 1 to 200 per square micron.
A roughened fibrous structure exists. 2. The coarse particles according to claim 1, wherein the fine particles attached to the fiber surface have an average primary particle size of 0.5 microns or less, and the fine particles are attached in an amount of 0.01 to 10% by weight based on the weight of the fiber. Faceted fiber structure. 3. The fine particles attached to the fiber surface are one selected from the group consisting of silicon-containing inorganic fine particles, inorganic fine particles consisting of oxides and/or salts of group metals of the periodic table, aluminum oxide, thorium oxide, and zirconium oxide, or The roughened fibrous structure according to claim 1 or 2, which comprises two or more types of inorganic fine particles. 4 Fine particles and fibers are 0.01 to
A roughened fibrous structure according to any one of claims 1 to 3, which is bonded with 10% by weight of an adhesive substance. 5 The average primary particle diameter is 0.5μ, which is more inert than the polymer matrix that makes up the fiber in low-temperature plasma.
A step of attaching the following fine particles to the fiber surface in an amount of 0.01 to 10% by weight relative to the fiber, a step of irradiating the fiber structure to which the fine particles are attached with low-temperature plasma,
A method for producing a roughened fiber structure, which comprises forming irregularities on the fiber surface. 6. The fine particles to be attached to the fiber surface are one or two selected from the group consisting of silicon-containing inorganic fine particles, inorganic fine particles consisting of oxides and/or salts of group metals of the periodic table, aluminum oxide, thorium oxide, and zirconium oxide. 6. The method for producing a roughened fibrous structure according to claim 5, wherein the inorganic fine particles are at least one species.