JPS6246666B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing synthetic fibers with high yarn cohesiveness. More specifically, the present invention relates to a method for producing high-grade, high-strength, high-modulus fully aromatic polyamide fibers with less single yarn looseness, fuzz, and loops. In recent years, demands regarding synthetic fibers have become increasingly sophisticated, and fibers with various high functions have been developed. In particular, there is a high demand for high strength and high modulus fibers, and in response to this demand, fibers made from various new materials have been developed and studied. However, although such fibers have high mechanical properties such as high strength and high modulus, they have low elongation and rigidity, so the yarn itself has poor cohesiveness, causing loops and fuzz. This method has the disadvantage that it causes a deterioration in product quality due to a large amount of oxidation, and also deteriorates handling and operability in post-processing steps. In other words, single yarns tend to fall apart, making it difficult to take out the yarn ends.Also, single yarns separate while the yarn is running and get caught in the yarn guiding guide, resulting in problems such as fuzz and yarn breakage. This has a significant impact on connectivity and, ultimately, on operability. It is known that these problems can be improved to some extent by applying compressed air to the running yarn to create entanglement between the single yarns before winding the yarn. However, according to such a method, although the unevenness of single yarns is suppressed, the unalignment of single yarns within the yarn bundle becomes worse, and the high strength characteristics are impaired. . On the other hand, in applications where fabrics woven from fibers subjected to such air pressure treatment are particularly required to have flatness, residual single yarn tangles may have a negative effect on the quality of the fabric. The inventors of the present invention have conducted extensive research in order to correct these drawbacks, and as a result, have arrived at the present invention. That is, the present invention involves applying a water-dispersible or water-soluble polymer as a dispersion or aqueous solution after drawing when producing wholly aromatic polyamide fibers, applying a substantially non-aqueous finishing oil, and then applying heat treatment. This method of manufacturing synthetic fibers is characterized by winding without drying. The wholly aromatic polyamide fibers mentioned here include polyparaphenylene terephthalamide, aromatic polyether amide, aromatic polysulfamide amide, aromatic polysulfonamide, aromatic polymethylene amide, aromatic polyketone amide, aromatic These include fibers made of polyamine amide and copolymers thereof. More preferably, repeating units (1) to (4) [In the formula, Ar ₁ , Ar ₂ , and Ar ₃ may be the same or different, and are aromatic carbocyclic residues in which the bonding chains extend in the same or parallel axes; Represents aromatic heterocyclic residues that must be bonded together and combinations thereof. R ₁ to _{R 5} may be the same or different and represent an alkyl group having 5 or less carbon atoms and a hydrogen atom. Ar ₄ and Ar ₅ may be the same or different and are selected from paraphenylene group and metaphenylene group. Y is -O-, -S-, _-SO2- ,

【formula】

【formula】

[Formula] (R ₆ to _{R 8} are the same as R ₁ to _{R 5} above). ], and the relationship between the number of moles of repeating units is substantially
(1)+(4)=(2), and (1)+(2)+(3)+(4)=100 mol%
In this case, the fiber is made of a polymer in which (3) is 0 to 90 mol%, (4) is 50 to 5 mol%, and preferably (4) is 30 to 10 mol%. Aromatic carbocyclic residues with bonded chains extending in the coaxial direction mean, for example, 1,4-phenylene, 1,4-naphthylene, etc. For example, a residue is 1.5
- Naphthylene, 2,6-naphthylene, etc. The aromatic residue is -N=N-, -N=CH-, -
They may be bonded to each other through a group selected from the group consisting of CH=CH- and -C≡C-. for example, Including. As the alkyl group having 5 or less carbon atoms, a methyl group,
Examples include ethyl group, propyl group, butyl group, pentyl group, etc., but methyl group is preferable. formula
Ar ₄ and Ar ₅ in (4) may be the same or different and are selected from paraphenylene group and metaphenylene group. Y is preferably -O-, -S-,

【formula】

[Formula] -CH ₂ - is selected, more preferably -O-. A substituent may be bonded to the carbon atom of the above aromatic carbocyclic residue and aromatic heterocyclic residue. Such substituents include halogen groups (e.g., chlorine, bromine, fluorine), lower alkyl groups (e.g., methyl, ethyl, isopropyl, n-propyl groups), lower alkoxy groups (e.g., methoxy, ethoxy groups), cyano groups, Examples include acetyl group and nitro group, with chlorine group and methyl group being preferred. In the present invention, the water-dispersible or water-soluble polymer is one that forms a sticky film when air-dried, and is a urethane emulsion (for example, Softex U-100 manufactured by Kao Atlas Co., Ltd.). , water-soluble isocyanate (Elastron F29-Daiichi Kogyo Seiyaku Co., Ltd.), acrylic emulsion (vinitol)
SY-800K-manufactured by Nagoya Yukagaku Co., Ltd.), polyamide epichlorohydrin aqueous solution (Polyfix 202)
- manufactured by Showa Kobunshi Co., Ltd.), water-soluble polyester (Pluscoat Z850 - manufactured by Goo Kagaku Co., Ltd.), and the like. If these agents are applied and then rolled up without going through a heat drying process, they will adhere to each thread guiding guide, roller, etc., and due to the stickiness of this adhesion, the single thread running will be taken off, resulting in single thread breakage. This will cause the yarn to become loose and even break, resulting in a decrease in operability. On the other hand, by applying a non-aqueous finishing oil after applying these agents, the moisture in the former is trapped in the non-aqueous oil, and a layer of finishing oil is formed on top of the adhesive layer. Therefore, it is possible to suppress the stickiness on the yarn guiding guide and the rollers without drying after that, and it becomes possible to wind up the yarn in a stable manner. Examples of non-aqueous finishing oils include mineral oil, esters of higher alcohols and higher fatty acids, esters of higher alcohols and polybasic acids such as adipic acid, sericic acid, phthalic acid, and trimellitic acid, and ethylene glycol. , glycerin,
Smoothing agents such as esters of polyhydric alcohols such as trimethylolpropane and pentaerythritol and higher fatty acids; nonionic activators made by adding ethylene oxide to organic compounds with active hydrogen having 8 to 22 carbon atoms; Generally known synthetic fiber treatments that combine anionic activators with phosphate groups, sulfate groups, sulfonic acid groups, etc., cationic activators with ammonium groups, and amphoteric activators with both anionic and cationic groups. It is a lubricant for use. "Substantially" means that it may contain several percent of an aqueous component within a range that does not impair the purpose of the present invention. The oil agent is applied to the running yarn in neat or substantially anhydrous form. EXAMPLES The present invention will be specifically described below with reference to Examples, but it goes without saying that the present invention is not limited to these Examples. In addition, in the following examples, parts indicate parts by weight. Example 1 A polymer consisting of an aromatic polyether amide consisting of 25 mol% paraphenylene diamine, 50 mol% terephthalic acid chloride, and 25 mol% 3,4'-diamino-diphenyl ether was obtained by spinning and stretching.
A 10% concentration emulsion or aqueous solution of a water-dispersible or water-soluble polymer is applied to a 750 denier 500 filament yarn so that the amount of the emulsion or aqueous solution applied is 0.5% by weight based on the solid content of the fiber. Then, a non-aqueous oil agent consisting of 70 parts of dioleyl adipate, 25 parts of polyoxyethylene lauryl amino ether, and 5 parts of sodium dioctyl sulfosuccinate was used as a finishing oil at 1.0% by weight based on the weight of the yarn.
I gave it and took it away. These results are summarized in Table 1. As a comparative example, a 15% aqueous emulsion of an oil agent consisting of 70 parts of dioleyl adipate, 10 parts of polyoxyethylene lauryl amino ether, 15 parts of polyoxyethylene hydrogenated castor oil ether, and 5 parts of sodium dioctyl sulfosuccinate was used as a finishing oil agent. An example was given. The water-dispersible or water-soluble polymers used were: Softex U-100 manufactured by Kao Atlas Co., Ltd. Elastron F29 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Vinitol SY-800K manufactured by Nagoya Yukagaku Kogyo Co., Ltd.
Polyfix 202 manufactured by Showa Kobunshi Co., Ltd. Pluscoat Z-850 manufactured by Gooi Kagaku Co., Ltd.

[Table] The evaluation method described in this table was based on the criteria shown in Table 2.

【table】

【table】 [Brief explanation of the drawing]

FIG. 1 is a side view of a method for evaluating yarn coherence. Figure 1-a shows yarn 1 with load 3 suspended.
Figure 1-b is a diagram showing the state of the single yarn coming apart after cutting.

Claims (1)

[Claims] 1. When producing wholly aromatic polyamide fibers, after drawing, a water-dispersible or water-soluble polymer compound is applied as a dispersion or aqueous solution, a substantially non-aqueous finishing oil is applied, and then heat-dried. A method for producing synthetic fibers, which is characterized in that it can be rolled up without twisting.