JPH0518959B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a treatment method for improving the depth of color of a dyed polyester fiber structure. (Prior art) Synthetic fibers, especially polyester fibers, are widely used due to their excellent functionality and texture.
A major drawback, in addition to being flame retardant, is that
Compared to natural fibers such as wool and silk, and semi-synthetic fibers such as rayon and acetate, it is inferior in sharpness, depth of dark colors, especially black depth, and color development. This disadvantage is due to the fact that polyester fibers are dyed with disperse dyes that have poor clarity, and the refractive index of polyester fibers is approximately 1.7, which is higher than other fibers and causes light to scatter easily. As a solution to these problems, modifications have been made to polyester fibers by introducing sheets that can be dyed with bright dyes such as cationic dyes and acid dyes, but although the brightness has been improved, the high refractive index of polyester fibers has been improved. The rate-based light scattering is not reduced and there is no substantial improvement in color depth. On the other hand, it is known that if the fiber surface is covered with a compound with a low refractive index, the color will appear darker and the depth will increase. To date, methods have been proposed in which the fiber surface is coated with low refractive index compounds such as fluorine compounds and silicone compounds, but these methods lack durability against dry cleaning, and are usually difficult to obtain in order to obtain a sufficient deep color effect. It is necessary to apply the compound in an amount larger than that used in the texture treatment, and even if a deep color effect is achieved, problems such as a change in the texture and a decrease in the fastness of the dyed product occur. JP-A-56-73175 proposes a method in which a water-soluble urethane prepolymer is applied to the fiber surface and then subjected to steam treatment. It was a problem. Furthermore, JP-A-56-112581 proposes a method of treating dyed fiber structures in a treatment bath in which a hydrophobic polymer with low refraction is emulsified or dispersed in the coexistence of an electrolytic substance. However, due to the use of hydrophobic polymers, there were problems with uniformity and reproducibility. (Problems to be Solved by the Invention) As a result of studies to solve these drawbacks, the present inventors found that problems such as bath stability, white powder adhesion and speck generation due to tarring and sedimentation were found in water-soluble urethane. Using polymer and alkaline earth metal salt,
It has been found that the problem can be effectively solved using a simple two-component system. Moreover, according to the method of the present invention, the prepolymer is efficiently and firmly absorbed onto the fiber surface, and a high deep coloring effect that is uniform and excellent in reproducibility can be achieved. (Means for solving the problem) A dyed polyester fiber structure is immersed in a two-component treatment bath consisting of a water-soluble urethane prepolymer and a water-soluble neutral alkaline earth metal salt. A method for deep-coloring a polyester fiber structure. (2) Claim 1 characterized in that an alkaline compound is added when performing bath treatment.
Deepening treatment method for polyester fibers as described in Section 1. (Description of Means) The polyester fiber structure as used in the present invention includes fibers produced from ordinary fiber-forming polyester resins by melt spinning. Note that the present invention applies to natural fibers, regenerated fibers, semi-synthetic fibers, other synthetic fibers, or mixtures of these fibers (mixed fibers, intertwisted fibers,
It is also effective on dyed materials (blends, etc.). The fibrous structure referred to in the present invention includes all types of structures such as tow, filament, yarn, woven or knitted fabric, and nonwoven fabric. The water-soluble urethane prepolymer used in the present invention is a hydrophilic urethane prepolymer in which isocyanate groups are blocked with bisulfite.
It is prepared by the method described in . Examples include blocks of propylene oxide and ethylene oxide, or urethane prepolymers made of randomly copolymerized polyether diol and hexamethylene diisocyanate, or xylene diisocyanate, in which free isocyanate groups are blocked with bisulfite. The amount of urethane used above is 0.1 to 10% (percentage of total fiber weight) as solid content adsorbed to fibers.
is preferred. The water-soluble urethane prepolymer is water-soluble and is efficiently absorbed onto the fiber surface by adding a neutral alkaline earth metal salt. Such alkaline earth metal salts include Be, Mg,
It refers to a salt containing any one of the metals Ca, Sr, Ba, and Ra as a cation, and examples include hydrochlorides, sulfates, and nitrates of the above metals, and complex salts of these metals. Among such compounds, MgCl ₂ ,
CaCl ₂ , BaCl ₂ and their hydrates are practically preferred. The amount of the metal salt compound used is preferably 0.5 to 10 g/total amount of the treatment solution. 0.5g/
If the amount is less than 10 g, there will be no effect on improving color development, and if it is used in an amount exceeding 10 g, the effect will not increase. The treatment of the present invention is carried out by an immersion bath treatment method. It can be processed with a dyeing machine commonly used for dyeing, and a bath ratio of about 1:5 to 1:100 is preferred; a bath ratio of less than 1:5 tends to cause uneven adhesion, and a bath ratio of 1:100 or more reduces adhesion efficiency. The treatment temperature may be appropriately selected within a practical range depending on the resin used, but generally a treatment temperature of about 30 to 60°C is possible. The exhaustion of the water-soluble urethane prepolymer of the present invention can be completed within practical time without the need for heating if the specific metal salt is used in combination. In order to improve the durability of the exhausted polymer, it is necessary to further add and blend an alkaline compound into the treatment bath. The alkaline compound may be any compound that exhibits alkalinity in the bath. Examples include hydroxides of alkali metals, alkaline earth metals, and ammonium salts, and weak acid salts such as carbonates and bicarbonates. Such compounds should be added in an amount of 0.01 to 0.5 based on the total amount of processing solution.
It is preferable to adjust the pH of the treatment bath to about 8 to 10. The timing of addition of the alkaline compound is not particularly limited, but it is preferably added at a stage when the polymer has been exhausted to a certain extent. The urethane prepolymer absorbed onto the fiber surface by this alkali causes a self-crosslinking reaction, forming a strong film. As a result, durability was significantly improved. Durability can be improved by performing a heat treatment at 120 to 180° C. after bath treatment, washing with water, dehydration, and drying to improve the film strength. (Example) Unless otherwise specified, all the proportions of various chemicals in the examples mean percentages based on the weight of the fiber.
The L value was used as a measure of the bathochromic effect, and this value was measured using a digital colorimeter manufactured by Suga Test Instruments Co., Ltd. The darker the color, the smaller the L value. Example 1 A textured yarn fabric (cashmere skin) made of polyester long fiber fabric was dyed under the following conditions. Dianix Black BG-FS (Mitsubishi Chemical Industries) 12% Acetic acid (90%) 0.5cc / Sodium acetate 0.1g / After dyeing at 130℃ for 60 minutes in a dye bath with a bath ratio of 1:30, reduction cleaning and water washing according to the usual method. A black dyed product was obtained. Using this dyed material, water-soluble urethane prepolymer "Elastron" F-29 (Daiichi Kogyo Seiyaku) was applied for 10 minutes.
% (solid content 1.7%) and water-soluble alkaline earth metal salts (A) MgCl ₂ 6H ₂ O, (B) CaCl ₂ 2H ₂ O,
(C) BaCl ₂ 2H ₂ O was used as shown in the table below, and (D) CuCl ₂ 2H ₂ O, (E) NaCl, and (F) K ₂ CO ₃ were used for comparison at 6 each.
g/g was prepared, the bath ratio of the treatment bath was adjusted to 1:30, and the treatment was carried out at room temperature for 30 minutes. Thereafter, it was dehydrated and dried in a mangle without washing with water. Further, dry heat curing was performed at 160°C for 1 minute to evaluate color development. The evaluation results are shown in the table below. As is clear from the table, the products treated by the method of the present invention in which alkaline earth metal salts were added had a large effect of improving color development, and the texture was almost as good as that of the finished products. However, when other metal salts were added, almost no effect of promoting exhaustion of the water-soluble urethane prepolymer was obtained.

[Table] Example 2 A textured yarn fabric (double dioset) of cationic dye-dyeable polyester fiber in which 2.4 mol% of the total structural units was ethylene 5-sodium sulfoisophthalate was dyed under the following conditions. Aizen Cathilon BlackCD-BLH (Hodogaya Chemical) 10% Acetic acid (90%) 0.5cc / Sodium acetate 0.2g / After dyeing at 120℃ for 60 minutes at a bath ratio of 1:30, perform reduction washing and water washing according to the usual method to dye black. I got something. This dyed material was mixed with "Elastron" F-29 (Daiichi Kogyo Seiyaku) 15% (solid content 2.55%) and MgCl ₂ -
50℃ in a bath containing 6g/6H ₂ O at a bath ratio of 1:30.
Processed for ×30 minutes. Then, during this treatment bath, further
0.07 g/Na ₂ CO ₃ was added and treated at 50° C. for 15 minutes. After treatment in the bath, the mixture was washed with water at room temperature for 10 minutes to remove unreacted urethane prepolymer and MgCl ₂ . Thereafter, it was dehydrated, dried, and dry heat cured at 160° C. for 1 minute to evaluate color development. The L value was 16.1 in the case of dyeing only, but it was 13.2 in the case of the treatment of the present invention, indicating a remarkable effect of improving color development. Also, regarding durability,
When we compared the color development after 5 washes with and without Na ₂ CO ₃ treatment, the L value before washing was lower than that without Na 2 CO 3 treatment.
Although it was 13.2, it decreased to 15.5, whereas with treatment, it was 13.2 and no decrease in L value was observed. [Washing]: Use a 0.5 aqueous solution of "ZABU" (manufactured by Kao Soap Co., Ltd.; neutral detergent) at 40℃ for 10 minutes, spin in a household washing machine (manufactured by Toshiba), dehydrate, then rinse with water for 5 minutes. The operation of drying and dehydrating is counted as one operation. (Effects of the Invention) The treatment method of the present invention forms a coating having strong adhesive strength on fibers, and provides a deep fiber structure with excellent washing resistance and dry cleaning resistance.

Claims (1)

[Claims] 1. A dyed polyester fiber structure is immersed in a two-component treatment bath containing a water-soluble urethane prepolymer and a water-soluble neutral alkaline earth metal salt to perform an in-bath treatment. A method for deep-coloring a polyester fiber structure, characterized by: 2. A method for deep-coloring a polyester fiber structure according to claim 1, characterized in that an alkaline compound is added during the bath treatment.