JPS648115B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for processing textile products with urethane resin using ultrafine acrylic fibers of 1 denier or less. Conventionally, many methods have been proposed for impregnating or coating textile products such as woven fabrics and nonwoven fabrics with soft polyurethane. In such processing, a method generally called a dry method is used in which the solvent of the soft polyurethane is evaporated and fixed by drying. At this time, N—N-dimethylformamide (hereinafter abbreviated as DMF), which dissolves polyurethane, is most often used as a solvent for soft polyurethane. However, since DMF dissolves acrylic fibers, if a textile product contains acrylic fibers, if a soft polyurethane solution is applied to the textile product by impregnation or coating, The drawback was that the acrylic fibers would dissolve. In particular, those using ultra-fine acrylic fibers were particularly problematic because they dissolved quickly. The present invention eliminates such drawbacks and provides a processing method using a soft polyurethane resin that can be applied to textile products containing ultrafine acrylic fibers.
The gist of the invention is to apply a soft polyurethane solution to a textile product containing 30% by weight or more of ultrafine acrylic fibers of 1 denier or less by impregnation or coating, and then dry and fix the soft polyurethane solution. As a solvent, it is compatible with DMF contained in the soft polyurethane solution, has a boiling point higher than the boiling point of DMF, and cannot dissolve the ultrafine acrylic fibers.
A method for processing an acrylic ultrafine fiber product using a urethane resin, which is characterized by using a soft polyurethane solution containing 10 to 30% by weight of DMF. The ultrafine acrylic material to be applied in the present invention is not particularly limited, and may be conventionally used polyacrylonitrile, a copolymer containing 70% (weight) or more of acrylonitrile, or a mixture of two or more of these. Good too. Further, the fibers may be short fibers or long fibers, but the effects of the present invention are particularly noticeable when these acrylic fibers have a fineness of 1 denier or less. The textile product can be applied to any fabric such as knitted fabrics and non-woven fabrics. There are no particular limitations on the other fibers mixed with the acrylic ultrafine fibers, and they may be natural fibers, regenerated fibers, semi-synthetic fibers, or synthetic fibers.These fibers may also be short or long fibers. It can be either. There is no particular limitation on the fineness of these fibers to be mixed. The fiber products used in the present invention must contain 30% by weight or more of the acrylic ultrafine fibers. When the amount is 30% by weight or less, even if the acrylic fibers are dissolved by DMF during processing of soft polyurethane, the damage will be small, and there will be no performance defects due to the dissolution. When the amount of acrylic ultrafine fiber exceeds 30% by weight
When acrylic fibers are dissolved by DMF, a decrease in texture curing performance clearly appears. The soft polyurethane used in the method of the present invention is a polyether type conventionally used for processing textile products,
Alternatively, it may be a polyester polyurethane or a mixture of two or more thereof. Polyether polyurethane is obtained by chain-extending a reaction product of at least one type of polyalkylene glycol and at least one type of organic diisocyanate using a compound having two active hydrogen atoms bonded to an amino atom. It is something. In addition, polyester-based polyurethane is made by bonding a reaction product of a polyester obtained by reacting at least one type of alkylene glycol with at least one type of organic acid and at least one type of organic diisocyanate to an amino atom. It was obtained by chain extension using a compound having active hydrogen atoms. The method for applying the soft polyurethane in this method may be either a method of applying it with a mangle and drying it after batting, or a method of applying it with a coating machine such as a knife coater or a roll coater and then drying it. After that, it is limited to a so-called dry heat treatment method in which a dry heat treatment is performed. Examples of organic solvents used in the method of the present invention that are compatible with DMF, have a boiling point higher than that of DMF, and cannot dissolve acrylic ultrafine fibers include propylbenzene, tetralin, hexanol, cyclohexanol, benzyl alcohol,
1-phenylethanol, 2-phenylethanol, ethylene glycol, 1.2-propanediol, 1.3-propanediol, glycerin, anisole, phenetol, benzaldehyde, furfural, cyclohexanone, acetophenone,
Examples include O-dichlorobenzene, methyl benzoate, ethyl benzoate, and methyl salicylate. These organic solvents can be used alone or in combination of two or more. What is important here is that the organic solvent must be compatible with DMF and incapable of dissolving the acrylic ultrafine fibers.
It is most important to use a solvent that has a higher boiling point than DMF.If an organic solvent that is lower than the boiling point of DMF is mixed, it will be difficult to prevent the acrylic microfiber from dissolving by DMF in the drying process, and this will affect the texture. It will also become harder and the performance will drop significantly. The amount of these organic solvents added is 10 to 30% by weight based on DMF contained in the soft polyurethane resin solution.
That's fine. If it is less than 10% by weight, it is difficult to prevent the dissolution of the acrylic ultrafine fibers, and if it exceeds 30% by weight, the stability of the combination may be poor depending on the type of solvent.
It is not suitable because it remains on the fabric even after dry heat treatment and may have an adverse effect. The fabric coated with the soft polyurethane resin is then subjected to a dry heat treatment at a temperature of 100 to 150°C, and in some cases, soaping, followed by softness, water repellency, etc., to produce a product. The resulting product has appropriate repellency and windproof properties due to the polyurethane resin, and also has excellent morphological stability. Hereinafter, the present invention will be explained in more detail with reference to Examples. In the examples, "%" or "part" simply means % by weight.
It means parts by weight. In addition, the evaluation method in the examples is as follows. (1) Rigidity Softness was evaluated according to the JIS L1079A method (45° cantilever method). (2) Texture Judgment The flexibility was mainly evaluated by handling, and the following judgments were made. (Soft) 〇＞△＞×＞×× (Hard) (3) Cheek mark property The movement of the fluff on the surface was confirmed with a fingertip, and the following judgment was made. (Good movement) 〇＞△＞× (Poor) Example 1 Blending acrylic fiber with single fiber fineness of 0.8d and cotton, blending ratio, acrylic fiber/cotton (%), 25/75,
After creating 1/80 ^MC thread of 30/70, 50/50, 70/30
Made of 28G sinker cotton jersey fabric. One side of this jersey knitted fabric was coated with the following soft polyurethane resin solution at a wet weight of 50 g/m ² using a roll coater, dried at 100°C, and further heat-treated at 130°C. Thereafter, it was immersed in a liquid containing a fluorine-based water repellent and a cationic softener, and then dried.

[Table] The product obtained by the method of the present invention has a water-repellent surface, moderate texture and stretch back property,
Furthermore, it had excellent windproof properties. The texture of the obtained product was as follows.

[Table] As seen in the above results, when the acrylic mixing ratio exceeds 30% in conventional processing, it is clear that DMF
It can be seen that the acrylic is dissolved and the texture is hardened. Therefore, when the acrylic content exceeds 30%, it is necessary to adopt the treatment method according to the present invention. Example 2 A copolymer of 93% by weight of acrylonitrile and 7% by weight of vinyl acetate was dissolved in dimethylacetamide,
Wet spun. Then, it is stretched in boiling water to obtain the average fineness.
An ultrafine fiber tow with a 0.1 denier and a total fineness of 4200 denier was obtained. This tow was cut into 3 m lengths, and the short fibers were uniformly disintegrated into single fibers using a conventional disintegrator, and a web having a basis weight of 25 g/m ² was obtained using a cylinder paper machine. Separately, 150cm/150cm of polyester filament 75D/36F with a potential shrinkage rate of 40% in boiling water.
A single jersey with 540 loops was knitted. The above-mentioned web was laminated on this polyester knitted fabric, and this was placed on a 90-mesh wire mesh. Next, from the web side, hole diameter is 0.15 mm, distance between holes is 1 mm.
High-pressure liquid columnar flow treatment using a multi-hole nozzle of 10
It was applied continuously at pressures of Kg/cm ² G, 30 Kg/cm ² G, and 30 Kg/cm ² G. Turn the obtained sheet over,
Two of the above webs were laminated thereon and subjected to high pressure liquid columnar flow treatment under the same conditions. This sheet was shrunk in boiling water (area shrinkage rate: 40%), dried, heat set at 150°C, and dyed to obtain a sheet structure. The characteristic values of the obtained sheet were as follows. Tensile strength History 9.0Kg/cm 5.1 〃 Ultrafine fiber/base fabric (weight ratio) = 0.93 Fabric weight 225g/m ² Fabric thickness 0.62 mm In addition, the obtained sheet structure has both sides of the base fabric covered with ultrafine fibers, In addition, one side is a sheet with raised fluff (A side) and the other side is a sheet with fluff facing down (B side),
It had excellent drapability and flexibility. A solvent-based soft polyurethane resin solution having the following compositions A to E was applied to the B side of the sheet using a roll coater at a wet weight of 80 g/m ² and then dried at 130° C. for 5 minutes. After that, soaping and softening treatment were carried out at 50°C for 20 minutes to obtain a product. The products obtained were as follows.

[Table] As seen in the above results, when DMF alone was used as the solvent for the polyurethane solution or when a solvent lower than the boiling point of DMF was mixed, acrylic fibers were dissolved and the texture was hard. On the other hand, when ethylene glycol, which is a solvent with a higher boiling point than DMF, was used within the regulatory range of the method of the present invention, there was no hardening of the texture and there were no problems in processing. On the other hand, when ethylene glycol was used in an amount exceeding 30% by weight based on DMF, the stability of the processing liquid was poor and processing was impossible. Example 3 The sheet structure created by the method of Example 2 was impregnated with a solvent-based polyurethane resin solution having the compositions A to C below, and then squeezed with a mangle (squeezing rate 100%).
After that, it was dried at 130°C for 5 minutes. Then, after sanding the surface with a sanding machine,
The product was made by soaping → softening treatment → brushing treatment. The obtained products are as follows.

[Table] As seen in the above results, the material treated with the method of the present invention has an excellent soft texture, and also has a subtle movement of fluff and sliminess on the surface, making it similar to natural suede. It was a leather-like sheet.

Claims (1)

[Claims] 1 In a processing method in which a soft polyurethane solution is applied to a textile product containing 30% by weight or more of ultrafine acrylic fibers of 1 denier or less by impregnation or coating, and then drying and fixing, the soft polyurethane solution is used as a soft polyurethane solution. It has compatibility with N-N-dimethylformamide,
In addition, use a soft polyurethane solution containing 10 to 30% by weight of N-N-dimethylformamide a solvent that has a boiling point higher than that of N-N-dimethylformamide and cannot dissolve ultrafine acrylic fibers. A method for processing acrylic fiber products using urethane resin.