KR101155454B1 - Process Of Producing Nylon 6 Draw?Textured?Yarn With High Elasticity - Google Patents

Abstract

PURPOSE: A method for fabricating nylon 6 twisting conjugated yarn of high elasticity is provided to produce outdoor clothing with excellent stretching property. CONSTITUTION: A method for fabricating nylon 6 twisting conjugated yarn of high elasticity comprises: a step of fusing nylon 6 and copolymer nylon 6; a step of preparing partial drawn/conjugated filament of side-by-side type at 3500-4800m/min of spinning rate; a step of passing the filament through a first feed roller and performing thermal treatment in a first heater at 165-190°C; a step of false-twisting in a ratio of 1.25-1.45; a step of passing the filament through a second feed roller; and a step of treating with oil and rolling at 350-550m/min.

Description

Process Of Producing Nylon 6 Draw? Textured? Yarn With High Elasticity}

The present invention is a method for producing a highly stretchable nylon 6 twisted composite yarn by producing a side-by-side type partially stretched composite filament by simultaneously spun a different type of nylon 6 composite spinning.

Recently, as the demand and interest of outdoor goods have increased, various outdoor textile products having multi-functionality have been developed. In particular, the most important characteristics required for windscreen or mountaineering jacket fabrics used for sports outdoor use are light weight (currently 40 ~ 50g / ㎡) and Park Jihwa, and most of the sportswear fabric materials used by famous brands at home and abroad are These products are sold.

The main material used in such lightweight sportswear is nylon, and the main application is applied to a jacket such as for WindProof, DownProof, Sleeping Bag, Padding Parka, and the like. 100% of the nylon material for sportswear produced is made of nylon 6, and nylon 6 ultra-light fabrics are made of nylon 6 15d and 20d fine-seamed materials to develop high-density weaving technology and dyeing processing technology for ultra-light fabrics. Lightweight fabrics for sportswear are produced.

Recently, in the field of outdoor sportswear, there is a trend that demands a stretch function to give a more comfortable due to the increased activity of consumers. In particular, the performance required for windscreen or climbing jacket fabrics is light weight (less than 50g / m²), air permeability (less than 0.5 cm3 / cm2 / sec), tear strength retention function of lightweight foil fabric (more than 1-2lb), water repellency (4) Class 5), water resistance (400-500 mm or more) and stretch resistance (15-20%) are required.

The use of such nylon 6 15d, 20d fine fiber material is required to study the ultra-light stretch fabric. Among the properties of nylon 6, the melting point is 220 ℃, and the melting point of nylon 66 is 250 ℃, and nylon 6 has a low melting point and softening point than nylon 66. Most of the technology for imparting elasticity of filament fibers is greatly influenced by the combustible temperature (1st heater temperature) and the stretching ratio which are imparted through the DTY (Draw Textrued Yarn) process.

Nylon 66 DTY stretch material is manufactured with nylon 66 POY 26d filament fiber, and the non-twisted yarn POY is given a draw ratio of 1.2.5 ~ 1.3 times, and its flammability temperature is increased to around 190 ~ 220 ℃. On the other hand, unlike nylon 66, nylon 6 has a low melting point and softening point of about 30 ° C, which makes it difficult to give a high combustion temperature of 220 ° C.
Accordingly, in Korean Patent No. 10-0330247, cooling of the spun nylon-6 yarn is carried out in a quench chamber of 1.8 m or more in length, and the stretching process is performed in two or more stages to a temperature of 120 to 190 ° C after stretching and flammable processing. It provides a manufacturing method of nylon-6 bulky yarn, characterized in that the heat setting. In this prior art, the flammability is set to 200 ° C. to improve bulky properties (see Examples 1 to 3), but the use of nylon-6 with low melting point is performed at a high combustion temperature of 200 ° C. This lowered and could cause a problem of non-uniform physical properties.

Therefore, the present invention solves the problems of the prior art, without being affected by the stability of the heat due to the yarn properties, but excellent in elasticity, excellent in non-receiving elastic modulus without a decrease in elongation, excellent elasticity, high thermal stress value nylon 6 It is a technical task to provide a combustible composite yarn.

Therefore, according to the present invention, after melting nylon 6 and copolymerized nylon 6, which are different types of nylon, the side-by-side partially stretched composite filament is produced at a spinning speed of 3500 to 4800 m / min, and then partially stretched. Pass the composite filament through the first feed roller and heat-treat it in the primary heater at 165 ~ 190 ℃, and then pass the second feed roller while burning it with a combustible ratio of 1.25 ~ 1.45 using a combustion belt made of friction belt or disk. Provided is a method for producing a highly stretchable nylon 6 flammable composite yarn characterized by stretching at a draw ratio of 1.25 to 1.38, then entangled, and then oil-treated to wind at 350 to 600 m / min.

Hereinafter, the present invention will be described in more detail.

The present invention is a method for producing a highly stretchable nylon 6 twisted composite yarn by producing a side-by-side type partially stretched composite filament by complex spinning the different types of nylon 6 at the same time.

First, a process of producing side-by-side partially stretched composite filaments by simultaneously compounding different kinds of nylons will be described.

In the present invention, the nylon 6 of the first component and the copolymerized nylon 6 of the second component having different shrinkage ratios are spun through a separate discharge port through a melting step. Nylon 6 of the first component is nylon 6 commonly used in the manufacture of fibers, copolymerized nylon 6 of the second component is to contain 0.3 ~ 5.0 parts by weight of the comonomer of the general formula (1) compared to 100 parts by weight of ε-caprolactam In addition to low volatility and low side reaction rate, it is also desirable to improve the shrinkage of the composite spun side-by-side partially stretched composite filament.

[Formula 1]

The relative viscosity of the nylon 6 is 2.45 ~ 2.55dl / g, the relative viscosity of the copolymerized nylon 6 is preferably 2.50 ~ 2.69dl / g, when the relative viscosity is less than the above range there is a problem that the composite radioactivity is significantly lowered, relative When the viscosity exceeds the above range, the composite radioactivity is lowered. In addition, when the viscosity difference between nylon 6 and copolymerized nylon 6 is less than 0.1, the composite radioactivity is lowered, and when the viscosity difference is greater than 0.2, there may be a problem that the composite radioactivity and shrinkage rate are reduced.

The ratio of nylon 6 and copolymerized nylon 6 of the present invention is 35:65 to 50:50, but when the ratio of nylon 6 is less than 35, the shrinkage is high, but when the content exceeds a certain amount, the shrinkage is not increased any more and the raw material properties are increased. Degradation problems may occur. When the ratio of nylon 6 exceeds 50%, there is a problem that filament detachment phenomenon occurs frequently in the lower part of the detention. As the ratio of copolymerized nylon 6 increases, the elongation at break and strength may be slightly lower.

The two general purpose nylon 6 polymers and the copolymerized nylon 6 polymer having different shrinkage ratios are melted by injecting the copolymerized nylon 6 polymer into one extruder and the copolymerized nylon 6 polymer into the other extruder using a composite spinning facility. After extruding and solidifying at a spinning temperature of 255 to 270 ° C and a spinning speed of 3500 to 4800 m / min through a side-by-side spinneret having 6 to 24 holes, the two good rollers were removed. It is wound and wound to produce side-by-side partially stretched composite filaments.

The prepared side-by-side partially stretched composite filaments are 20 to 26 d / 6 fila fineness, 4.0 to 5.0 g / d in strength, 65 to 76% elongation, and 0.5 to 0.9 uniformity, and are partially stretched filaments having excellent physical properties.

Hereinafter, a process of manufacturing the false composite yarn having excellent high crimping and high bulkiness by false processing the obtained partially stretched composite filament will be described.

First, the partially stretched composite filament is passed through a first feed roller and heat-treated in a primary heater at 165 to 190 ° C., and then using a combustor composed of a friction belt or a disk, Draw at 1.25 to 1.38 with a draw ratio of 1.25 to 1.45 while passing through the second feed roller.

The primary heater imparts the bulkiness of the partially stretched composite filament by heat treatment and combustion. When the first heater temperature is less than 165 ℃, the problem that the cutting strength and thermal stress is lowered, when the first heater temperature exceeds 190 ℃, the flammability work is significantly reduced and the physical properties are uneven. The higher the heater temperature, the higher the non-elastic elastic modulus is, and the higher the non-elastic elastic modulus may be due to the fact that latent crimping effects are expressed when the heat is applied at 95 ° C. in the dyeing step. In the present invention, by using the side-by-side partially stretched composite filament of general nylon 6 polymer and copolymerized nylon 6 having a higher shrinkage rate, the bulkyness difference and shrinkage rate difference may be induced during the stretch to combusting process. Because of this, bulky and elasticity can be effectively given without increasing the flammable temperature.

In the present invention, the flammability ratio (speed ratio, V / R, Velocity Ratio) is 1.25 to 1.45 based on the DTY 20d, but less than 1.25 may cause deterioration of flammability. Problems may arise. The angle of the belt facing the flammable device is preferably 100 ~ 120 ° in terms of workability and stretch yarn production.

The second feed roller is passed through the second feed roller, and the filament is stretched using the speed difference between the first feed roller and the second feed roller. At this time, the draw ratio is preferably 1.25 to 1.38, but when the draw ratio is less than 1.25, there is a problem that the cutting strength and the thermal stress decrease. The higher the draw ratio, the higher the non-retractive elastic modulus, but when the draw ratio exceeds 1.38, the elongation at break is very low.

After stretching, the entangled and oil-treated and wound at a firing speed of 350 ~ 600m / min to complete the combustible composite yarn of the present invention, the yarn passed through the second feed roller is wound after the entangled to improve the focusing.

The nylon 6 flammable composite yarn obtained in the present invention has strength of 5.0 to 6.0 g / d, elongation of 22 to 36%, specific shrinkage of 9 to 13%, and non-retractive elasticity of 40 to 60%, and is excellent in elasticity and crimping property.

Therefore, according to the present invention, it is excellent in elasticity because it is excellent in non-shrinkage rate and non-receiving elastic modulus without deterioration of elongation, and has excellent thermal stress value and provides excellent elasticity of windproof or climbing jacket It can be widely used for outdoor applications such as fabrics and knits.

1 is a schematic diagram of a manufacturing process of nylon 6 flammable composite yarn of the present invention,
2 is a cross-sectional photograph of a side-by-side partially stretched composite filament of the present invention,
Figure 3 is a four-side photograph of the nylon 6 flammable composite of the present invention,
Figure 4 is a photograph of the surface after non-water treatment of nylon 6 flammable composite yarn of the present invention.

The following examples are given as non-limiting examples of the method for producing nylon 6 flammable composite yarn of the present invention.

Example 1

1. Preparation of side-by-side partially drawn composite filaments

The copolymerized nylon 6 containing 1.0 parts by weight of nylon 6 of the first component and the comonomer of the following formula 1 of the second component with respect to 100 parts by weight of ε-caprolactam separately through the melting step under the conditions shown in Table 2 Spinning through a discharge port of gave 26d / 6f POY. Physical properties of the prepared 26d / 6f POY are shown in Table 3.

[Formula 1]

division unit Nylon 6 chip
(1st ingredient: Semi Dull) Copolymer Nylon 6chip
(2nd ingredient: Bright) Relative viscosity - 2.50 ± 0.03 2.60 ± 0.09 TiO ₂ Content % 0.325 ± 0.03 0.28 Moisture Content % 0.05 ± 0.020 0.12 Na content % - 0.12 Amine End group (NH ₂ ) meq / kg 48 ± 3 20 ± 3 Yellow Index (YI) - <9 <2.8 Melting point ℃ 220 220

Input ratio
(1st component: 2nd component) Radiation temperature
(℃) GR1 / GR2 speed
(m / min) Winding speed
(m / min) Remarks 40: 60 265 4230/4230 4200 -

ratio
(1st component: 2nd component) Fineness burglar Shinto U% 40: 60 25.66d 4.38 g / d 71.82% 0.76

2. Manufacture of composite twisted yarn

The obtained 26d / 6f POY was passed through the first feed roller according to the process conditions of the following Table 4 and heat-treated at 180 ° C. in the first heater, and then the second feed roller was burned with a combustion ratio of 1.35 by a combustion device composed of a friction belt. After stretching through 1.29 times while passing through, entangled with oil treatment and wound at 400 m / min yarn speed to prepare nylon 6 twisted yarn (20d / 6f) having the properties shown in Table 5.

Combustion Process Conditions Elongation ratio
(DR) 1st heater temperature
(℃) Four
(m / min) Fuel economy Belt angle
(°) 1.29 180 400 1.35 110

Comparative Example 1

To prepare a flammable composite yarn in the same manner as in Example 1 by supplying a general 26d / 6f POY instead of the side-by-side partially stretched composite filament of Example 1 shown in Table 5. The combustible property evaluation items measured the fineness (d), cutting strength (g / d), cutting elongation (%), non-elastic elastic modulus (%) and non-shrinkage (%) based on KS K test criteria. . The maximum thermal stress (g) and temperature (° C) at the peak point were measured using a thermal stress meter of LTD.

division Island
(d) burglar
(gf / d) Shindo
(%) Non-shrinkage rate
(%) Dagger
Elastic modulus
(%) Thermal stress
And temperature Example 1 20.44d 5.99g / d 28.59% 10.6 53.2 184 ℃, 5.07g Comparative Example 1 21.2d 5.50 g / d 27.12% 9.9 31.2 183 ° C, 4.78g

The non-elastic elastic modulus is an evaluation method that can measure the elastic modulus change of the false twisted yarn by the crimp change according to the shrinkage of the twisted yarn after the non-aqueous heat treatment for 20 minutes at 95 ℃, the higher the value, the higher the elasticity effect. Relative evaluation of the elasticity change according to the crimping effect caused by shrinkage when the heat is about 100 ℃ in the pretreatment step in the dyeing process can be inferred at four stages. However, even if the crimp property is high, if the shrinkage force to shrink when the false twisted yarn receives heat may limit the manifestation of the crimping effect, it may be said that the higher the thermal stress value is.

The false twisted yarn of Example 1 was found to have superior non-retractive elastic modulus than the conventional nylon 6 DTY, which is Comparative Example 1, but the roughed yarn had a bulky crimp characteristic, so the shrinkage difference between nylon 6 and modified nylon 6 was significantly different. It was very difficult to identify the latent characteristics of spiral crimp. Therefore, in manufacturing the side-by-side partially stretched composite filament of Example 1, cold stretching was performed 1.5 times between two godet rollers, and the 1st godet roller was heated at room temperature and the 2nd godet roller was heat-set to 130 ° C. As a result of the stretched composite filament yarn, which was determined to be confirmed by observing the surface of the non-water treated yarn at 95 ° C. for 30 minutes, it was found that the three-dimensional crimp form was expressed as shown in FIG. 4. Although it does not reach very high crimp forms such as PET latent yarn, it can be seen that there are many elastic effects due to the difference in shrinkage rate.

1: Side-by-side partially stretched composite filament
2: first feed roller
3: first heater 4: burner (DISK, BELT)
5: second feed roller 6: second heater
7: 3rd roller 8: winding roller

Claims (4)

After dissolving the nylon 6 and the copolymerized nylon 6, which are different kinds of nylon, a partially drawn composite filament of side-by-side type was produced at a spinning speed of 3500 to 4800 m / min, and then the partially drawn composite filament was prepared. After passing through the feed roller and heat-treated in the primary heater at 165 ~ 190 ℃, using a combustion belt consisting of a friction belt or a disk by the combustion ratio of 1.25 ~ 1.45 while passing through the second feed roller, the draw ratio of 1.25 ~ 1.38 A method for producing a highly stretchable nylon 6 flammable composite yarn, which is characterized in that after stretching, after entanglement, oil treatment is performed to wind at 350 to 550 m / min. The method of claim 1, wherein the copolymerized nylon 6 contains 0.3 to 5.0 parts by weight of the comonomer represented by the following Chemical Formula 1 with respect to 100 parts by weight of ε-caprolactam.
[Formula 1]

The method of claim 1, wherein the ratio of the nylon 6 and the copolymerized nylon 6 is from 35:65 to 50:50. The method of claim 1, wherein the side-by-side partially stretched composite filament has a fineness of 20 to 26d / 6fila, strength of 4.0 to 5.0g / d, elongation of 65 to 76%, and uniformity of 0.5 to 0.9. Manufacturing method of stretchable nylon 6 flammable composite yarn.

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