JPH0247366A - Production of flexible synthetic fiber - Google Patents

Abstract

PURPOSE:To impart a synthetic fiber with softness resistant to washing by applying a hydrophilization agent to a melt-spun synthetic fiber before the completion of drawing. CONSTITUTION:An undrawn synthetic fiber composed of a polymer such as polyester, polyamide or polyolefin and extruded from a spinneret is coated with 0.2-0.7wt.% (based on the fiber) of a hydrophilization agent having a hydrophilic group (e.g., a polyester polyether resin produced by copolymerizing a polyethylene glycol to terephthalic acid and sulfoisophthalic acid) before the completion of the drawing and the coated fiber is drawn to obtain the objective fiber having softness durable to washing and exhibiting stain-removing property. The synthetic fiber can be produced in high operability by this process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing flexible synthetic fibers, and more particularly to a method for producing synthetic fibers having excellent flexibility as well as washing resistance with good operability.

[Conventional technology]

Conventionally, as a method of imparting flexibility to synthetic fiber products, after dyeing the synthetic fiber product, a softening agent mainly composed of a cationic surfactant such as a quaternary ammonium salt has been applied to the synthetic fiber product, by replacing the water anew or adding it to the washing bath. A commonly used method is to add it to the rinse bath inside or after washing and treat it in the bath, but this method gives temporary flexibility, but it does not have durability after washing etc. Because the flexibility ability decreases,
In order to obtain a sufficient softening effect, it was necessary to perform a softening treatment after each wash.

[Problem to be solved by the invention]

An object of the present invention is to provide a method for producing synthetic fibers having excellent flexibility and wash resistance with good operability.

[Means to solve the problem]

The present invention is characterized in that when melt-spinning synthetic fibers, a hydrophilic agent is added to the yarn before the drawing is completed. Typically,
In the present invention, when synthetic fibers are melt-spun, a hydrophilic agent selected from hexamers, oligomers, and polymers containing hydrophilic groups is added to the melt-spun yarn.

The synthetic fibers used in the present invention include polyethylene terephthalate, polybutylene terephthalate, poly-p-ethyleneoxybenzoate, polyesters mainly composed of these, nylon 6, nylon 12, and nylon 46.
, nylon 66, nylon 610, and polyamides based on these, polyethylene, polypropylene, and polyolefins based on these, polymers based on polyacrylonitrile, polyvinyl chloride, polyvinylidene chloride, and fibers made of polymers based on these. Examples include.

The hydrophilizing agent in the present invention is generally a monomer, oligomer or polymer containing a hydrophilic group, such as block copolymerization or grafting of polyalkylene gelylol such as polyethylene glycol or polypropylene glycol to terephthalic acid and sulfoisophthalic acid. Polyester polyether resin obtained by copolymerization,
and acrylic resins such as acrylates or diacrylates containing PAG, as well as acrylic acid, methacrylic acid, styrene sulfonic acid, maleic acid or esters of these acids, and polyamide polyalkylene glycol copolymers, methoxymethylated nylon, and the like.

The hydrophilic agent used in the present invention needs to be incapable of forming a film. When using a hydrophilic agent with film-forming ability, such as polycarboxylic acid-containing polyalkylene oxide, polyisocyanate-containing polyalkylene oxide, or vinyl group-containing polyalkylene oxide, when applied to melt-spun yarn, the hydrophilic agent will be applied to the fiber surface. Since a film is formed and penetration into the interior of the fiber is difficult to occur, it is not possible to obtain a product with sufficiently satisfactory flexibility and washing resistance. In addition, when there is a hydrophilic agent coating on the fiber surface, there is also the drawback that residues of the hydrophilic agent coating tend to accumulate on the drawing rollers, yarn guides, etc. during post-processing steps such as the drawing process and the yarn twisting process.

The method of the present invention is preferably carried out by a so-called spin finish method. That is, before the drawing of the undrawn yarn spun from the spinneret is completed, a liquid containing a polymer, oligomer, or polymer containing a hydrophilic group (polyalkylene glycol, PAG) is applied to the undrawn yarn. This is a method in which stretching and fixing treatment of a hydrophilic agent are performed simultaneously or separately. This method has the advantage of simplifying the process and allowing the hydrophilizing agent compound to penetrate inside the fibers and firmly adhere to them.

The amount of hydrophilic compound added to the undrawn yarn is 0.2 of the fiber.
% to 0.7%.

If the amount of hydrophilic agent compound attached is less than 0.2%, sufficient flexibility will not be obtained, and if it exceeds 0.7%, smoothness will increase, resulting in poor stretchability or The winding form may collapse.

Furthermore, when a product using the yarn produced according to the present invention was washed, it was found that stain removal was good and there was almost no re-contamination from the liquid.

After the yarn is coated with a hydrophilic agent after spinning and before the drawing is completed, it is often wound up through processing steps such as drawing and twisting, so the coefficient of friction between the yarn and the drawing rollers and between the yarn and the system may vary. It is desirable that the material does not affect post-processing such as twisting or crimping.

Specific examples of the present invention are shown below, but the present invention is not limited thereto.

〔Example〕

0.6 to 0.8% of an emulsion of the hydrophilic agent and raw oil agent (glycerin EOPO, nonylphenol EO7, etc.) shown in Table 1 was added to the melt-spun nylon 6.6 thread.
It was deposited and wound up at a speed of 650 m/min. Next, the temperature was 210°C, the magnification was 3°7, and the stretching speed was 213 E+m.
The yarn was drawn at a speed of 1/min, and then crimped using a steam jet processing machine at 290° C. to obtain a crimped yarn of 800 d/40 f.

Three of the crimped yarns obtained in this way were combined, first twisted (Z -125T/m), two more were combined and final twisted (S 85T/m), and the Monp cord yarn was made. Obtained. This thread was made into a skein shape and dyed at 95℃ using acid dye.
It was stained pale red at x60 minutes. This thread was sewn onto a base fabric and cut with a cutter to a cord length of 12 cm to create a motsupu (approximately 100 g).

The flexibility of this mop (sensory test) and ease of use as a mop were evaluated, and the same mop was also subjected to a stain removal test. The results are shown in Table 1.

The measurement methods for the test items in the table are as follows.

(1) Softness effect: The feel of the mop was evaluated by 10 judges, and the softness effect was determined based on the average.

The same mop was washed 45 times and then evaluated again.

○: Extremely soft △: Soft ×: Slightly soft Washing method> Monogen 170T on a Landaometer (manufactured by Suga Test Instruments)
(manufactured by Dai-Kogyo) 0.5 g/j2 (11) and 10 steel balls were placed in a separate bath, and each motu of Example 1 and Comparative Examples 1 to 3 was placed in a separate bath, and stirred at 60°C for 30 minutes. Dehydrate for minutes. Next, wash with hot water (60℃ x 10 minutes) twice and with water (room temperature x 10 minutes) twice, dehydrate and tumble (60℃ x 10 minutes).
dry.

(2) Ease of use: Using this motsup, 10 judges were asked to wipe a piano keyboard and evaluated the ease of use of the motsup based on a comprehensive review of the following items. In addition, the same mop was evaluated again after being washed five times.

(3) Stain removability: 1 g of Diamond Paste (manufactured by Shinryo Chemical Co., Ltd.) and 100 ml of motor oil were mixed and prepared as the following artificial pollutant. Example 1, Comparative Examples 1 to 3. Place one motu each in a separate bath and stir at 60°C for 30 minutes to remove dirt. Next, wash with hot water (60℃ x 10 minutes) 2 times with water (room temperature x 10 minutes) 2
After doing so, visually judge the degree of dirt.

○: Almost no black stain △: A little black stain ×: Significant black stain (4) Stretchability After applying a hydrophilic agent to the yarn before completing stretching after spinning, the stretching process is subsequently started. However, the stretchability at this time was evaluated.

○: Small slippage with the drawing roller ×: Large slippage with the drawing roller Table 1 W: Number of washes*1 Raw yarn oil component Glycerin EOPO Nonylphenol EO7 Oleyl phosphate EO7 40% 30% Sodium salt 20% Castor oil EO308% Styrenization Roughenol 2% *2 Hydrophilic agent CH2 CH2N (CH20)nH CH2-CH2 N-polyoxyalkylene 6-hexane lactam [Effects of the invention] According to the present invention, excellent flexibility with wash resistance and stain removability and when used as a motsupu,
It becomes possible to produce synthetic fibers with good operability that have a good shine and can easily follow uneven surfaces.

Agent: Patent Attorney Kawakita Takecho

Claims (1)

[Claims] 1. A method for producing flexible synthetic fibers, which comprises adding a hydrophilic agent to yarns before completion of drawing when melt-spinning synthetic fibers.