KR0134985B1 - Splash-resistant polyester fiber, process for them and apparatus for the same - Google Patents

Abstract

Water repellent polyester fiber, the manufacturing method and apparatus are disclosed for providing thermal stability and robustness and high productivity of 200 m/s. The first stage drawing is under 80 % of total drawing magnification and is done at 120deg.C which is the glass transition temperature in the first row rollers (21) and second row rollers (22); the second drawing is done by passing the multi yarn through hot air of 270deg.C from the first air heater between the second row rollers (22) and third row rollers (23); the yarn is coated with repellent solution containing 10% of repellent in distilled water by the coater (40) at the inlet of the second air heater (32) so that the absorption is 0.5-1.0% weight of the total fiber; and the yarn is dried for 0.1-1.5 seconds in the second air heater (32) at 260deg.C and the third air heater (33) at 265deg.C and heat treated to have 12% of dilatation.

Description

Water repellent polyester fiber, method and apparatus for manufacturing same

FIG. 1 is a view schematically showing a water repellent polyester fiber manufacturing apparatus configured by installing a water repellent coating coater and a two-stage coating solution drying and fixing oven in order to manufacture a water repellent polyester fiber according to the present invention.

* Explanation of symbols for main parts of the drawings

10: undrawn draw roll 21: first row roller group

22: second row roller group 23: third row roller group

24: 4th row roller group 31: 1st hot air oven

32: second hot air oven 33: third hot air oven

40: coater 41: coating liquid

42: coating roller 50: winding machine

The present invention relates to a polyester fiber having water repellent or anti-wicking properties, and a method and apparatus for producing the same.

Although polyester fabrics having water repellency and good rolling stability are widely used, anti-wicking or water repellent treatments take a long time and are not possible techniques for all fabric manufacturers. The imparting water repellency by post-treatment of the fabric has disadvantages such as nonuniformity of treatment and poor durability. Therefore, it is desirable to give the anti-wicking property to the yarn itself so that the fabric manufacturer can immediately produce the fabric having water repellency and the safety of the village.

Anti-wicking refers to the ability of a fiber or fabric to resist the ingress of water or moisture through the fiber bundle, which can prevent whitening, discoloration and deterioration of the coated fiber. . Such anti-wicking fibers allow fabric makers to use looms of various sizes without high costs for fabric preparation. Wicking refers to the phenomenon of surface tension due to the tendency of general fibers to transport water by capillary action.

In an attempt to impart anti-wicking properties to fibers, US Pat. No. 2,542,301, which describes a method for producing continuous filaments, describes a method of making a solution from cellulose derivatives in solution, and US Pat. No. 2,865,790 describes a method for producing fibrous materials. In order to improve the efficiency, a method of immersion or chemical bonding is described by right-angled a radio frequency field (RF field). US Patent No. 5,116,682 discloses anti-wicking property while dissolving commercially available fibers with excellent safety. How to do this is described.

However, these prior art methods take a lot of time and money to impart water repellent properties, and it has been pointed out that the manufactured products are expensive.

Accordingly, the first object of the present invention is to provide a method for producing a water-repellent polyester fiber which can impart excellent passion stability (or village stability) and anti-wicking property at a high speed of 200 meters or more without requiring a separate process. To provide.

In addition, the second object of the present invention is to provide a method for producing a water-repellent polyester fiber which can impart excellent enthusiasm stability (or village stability) and anti-wicking property at a high speed of 200 meters or more without requiring a separate process. It is to provide a device suitable for implementation.

The first object is achieved by the present invention which enables uniform coating at a high speed of 200 m / min, unlike the conventional method, by applying a water repellent during the process of imparting thermal stability to the polyester fibers.

More specifically, the method for producing a water-repellent polyester fiber according to the present invention is 0.5 to 1.0% by weight of the fluorine-based polymer in the process of producing a thermally stable polyester by stretching and heat-treating polyester unstretched yarn by the transverse stretching method After adsorbing, drying and curing in a 240 ~ 270 ℃ oven (Curing).

The thermally stable polyester refers to a polyester fiber having ultra low shrinkage of 1% or less of dry heat shrinkage at 0.22 g / d load after 2 minutes treatment at 177 ° C. while maintaining high strength in a yarn.

In this production method, a water repellent is applied by dispersing a fluorine-based polymer in an aqueous solution, and preferably, one in which the fluorine-based polymer is dispersed in an aqueous phase on an aqueous solution. Such dispersions may be anionic or cationic or nonionic. In particular, the fluorine content dl of the emulsion used as coating liquid is preferably contained in an amount of at least 5% by weight, preferably 7 to 10% by weight.

The amount of adsorption of the fluorine-based polymer relative to the total weight of the fiber after application of the water repellent is preferably 0.5 to 1.0% by weight. If the amount of adsorption is too large, cured in a state that is not completely dried, so that there is a problem occurs in the weaving process, there is a problem that the fiber strength is lowered.

In addition, the amount adsorbed on the yarn (yarn) is 0.5 to 1.0% by weight, preferably 0.5 to 0.8% by weight of the yarn.

The fluorine-based polymer mainly used is a polyperfluorinate-based water repellent, and commercially available examples thereof are commercially available from Asahigard AG-710 (Asahi Chemical), MILIGUARD 309 or 345 (MILLIKIN CO.), And 3M (3M). FX-367, 398, 399 or FC-232 are widely used.

About 1 to 10% of emulsifier or surfactant is added to the emulsion, and the remaining 70% or more is composed of water. As other additives, preservatives or accelerators may be used. Such materials are generally known in the literature and the like.

Polyester fibers to which a water repellent is applied are polymers having a long molecular chain of at least 75% by weight of ester and acid, and such polyesters are glycols containing 2 to 20 carbon atoms and at least 75% or more of dika containing terephthalic acid. It is formed by reaction with a leic acid.

Other dicarboxylic acids that may be used are sebacic acid, adipic acid, isophthalic acid, and the like, and linear terephthalate polyesters prepared as such acids include poly (ethylene terephthalate), poly (butylene terephthalate), poly ( Ethylene terephthalate / 5-chloroisophthalate), poly (ethylene terephthalate / 5-sodiumsulfoisophthalate), and the like.

In addition, it is preferable to use a nonionic polyether system compatible with the coating agent as the oil component used in the fiber manufacturing, and the oil content is generally appropriately controlled to about 0.5% to 1%.

The total fineness of the fibers in the present invention depends on the application but preferably 500 to 2,000 denier, and the number of filaments is preferably 70 to 500, preferably 190 to 250.

In addition, the water-repellent polyester manufacturing apparatus provided to achieve the second object of the present invention, as shown in the accompanying drawings, the first row roller group 21, the second row roller group 22, for fixing the stretching point The third row roller group 23 of the apparatus for providing thermal stability to the polyester fiber, the first hot air oven 31, the third row roller group 23, the fourth row roller group 24 is sequentially configured The coating liquid 41 is accommodated between the fourth heat roller group 24 and the coater 40 having the coating roller 42 therein, and the second hot air oven 32 for drying the coating liquid downstream of the coater 40. And a third hot air oven 33 for fixing the coating is sequentially installed.

The improvement of this device is that it is able to treat the water repellent agent at high speed without damaging the physical surface of the fiber surface while expressing the properties such as ultra low shrinkage property and excellent strength of the yarn. The device is characterized by a hot wind oven that does not come into direct contact with the yarn, but in particular, an oven in two stages, which gives a high temperature relaxation process that imparts the characteristics, and the surface of the coating liquid immediately after passing the third heat roller group. The fibers attached to the second hot air oven 32 to quickly dry the moisture of the coating liquid from the yarn to open and adhere the coating material in the third hot air oven (33).

In the present device, the water repellency is imparted to the polyester in the coater 40, the fluorine-based water repellent is attached to the fiber and passes through the second stage hot air oven while the second hot air oven 32 removes the moisture quickly and then the third hot air oven (33). Cure). The position is between the position of the third heat roller group 23 and the position of the second hot air oven 32 on the drawing during the stretching and heat treatment of the fiber and giving thermal stability.

The second hot air oven serves to quickly remove moisture for a short residence time before the fiber contacts the guide or the roll, and the third hot air oven 33 is designed to be cured for a short residence time in the higher temperature third hot air oven 33. All of the structures are in contact with the yarn.

The device avoids raising the temperature of the stretching roller group by more than 250 ℃, and prevents direct contact between the thread strand and the high temperature roller group to improve the drawing operability by increasing the relaxation rate, and high temperature heating air (hot air). The oven is supplied with the second-stage stretching zone between the second row roller group 22 and the third roller group 23, and the relaxation section between the third roller group 23 and the fourth roller group 24. The high-strength and low-shrinkage polyester fibers could be obtained while solving the problem of the drawability caused by the high temperature heat treatment by the heat roller or the fibers being wound on the rollers or causing the tar, and also installed in the relaxation section. A coater 40 containing a fluorine-based polymer coating solution 41 and a roller 42 was installed at the inlet of the second hot air oven 32 to continuously treat the water repellent agent on the yarn.

According to a preferred embodiment of the present invention, the temperature of the first row roller group 21 and the second row roller group 22 in which the first stage stretching is performed is in the range of 80 to 135 ° C. which is the glass transition temperature of the polyester non-drawn yarn. It is preferable to set the first stage stretching to 80% or less of the total draw ratio. Subsequently, the second stage stretching is preferably performed by passing a multi-thread thread between the second hot roller group 22 and the third hot roller group 23 through the first hot wind oven 31 for fixing the stretching point.

The heating air temperature of all ovens in this apparatus is in the temperature range of 240 ° C-270 ° C, preferably 250 ° C-260 ° C. The residence time in the oven of the yarn is 0.1-1.5 seconds, preferably 0.3-1.0 seconds. If the temperature is too low, the anti-wicking property is not a problem, but the heat shrinkage characteristics required by the present invention is difficult to obtain. The yarn passed through the oven is wound up in the winder (50).

In this apparatus, the coating liquid is dried and cured in two stage ovens of a drying oven and a curing oven, but an oven designed to simultaneously dry and cure may be used.

The fiber produced according to the present invention has an ultra-low shrinkage property of at least 7.5 g / d of breaking strength and 1% of dry heat shrinkage tested in air at 177 ° C, and at the same time, dye absorption length of the fiber after immersion in 0.5% dye for 1 hour. The anti-wicking property is represented by 10cm or less.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the Examples.

[Examples 1-3 and Comparative Examples 1-3]

Polyethylene terephthalate having an intrinsic viscosity of 0.90 or more is melt extruded with an extruder type extruder and melt spun through a spinneret. The unstretched yarn is multi-stretched at 5.5 times the total draw ratio by the Warper-Draw method using the apparatus of the accompanying drawings, heat-treated, relaxed, and wound up after stretching.

Stretching and heat treatment in the process was carried out as follows.

The temperature of the first row roller group 21 and the second row roller group 22 in which the first stage stretching occurs is 120 ° C., the glass transition temperature of the undrawn yarn, and the first stage stretching is 80% or less of the total stretching ratio. do. Subsequently, the second stage drawing passes the mulder thread through the first hot air oven 31 for fixing the drawing point using high temperature heating air at 270 ° C. between the second heat roller group 22 and the third heat roller group 23. Perform. After the stretching is completed, the loosening heat treatment consisting of a high temperature two-stage hot air oven (32, 33) is provided with a coater at the inlet of the second hot air oven (32) as shown in the figure to treat the aqueous fluorine-based polymer in the yarn as shown in the table below. Afterwards, 12% relaxation heat treatment gives anti-wicking properties.

At this time, the material used was an emulsion of fluorine-based water repellents FC-232, FX-398, and MILLIGUARD 345 obtained from 3M company. .

The amount of adsorption is calculated to be 0.6% per fiber weight, and passed through an oven that is not in direct contact with the yarn, but dried at a temperature of 260 ° C. in the second hot air oven 32 and 265 in the immediately adjacent third hot air oven 33. Stick to temperature.

During the fixing process, the residence time was 0.5 seconds. After drying and fixing, the yarn was wound in the branch pipe.

As a result of testing the properties of the wound yarn, the yarns of Examples 1 to 3 and Comparative Examples 1 to 3 showed excellent properties of strength of 7.8 g / d, elongation at break of 22.0%, and dry heat shrinkage of 0.5% at 177 ° C. The dry heat shrinkage was measured after drying for 24 hours at 25 ° C and 65% RH, after measuring the length of the sample at 0.22g / d static load at l ₀ , and drying the oven at 177 ° C for 2 minutes at 0.22g / d static load. by the length of the sample in ₁ ℓ it was obtained from the formula below.

On the other hand, the anti-wicking property is a method of reading the dye wicking mark from the yarn when 1 hour after immersing 30cm long yarn in the vertical direction by making Milceton Blue FBL, a polyester dye, in 0.5% concentration in water. Tested through. The test results are shown in Table 1 below.

Claims (6)

During the process of stretching and heat-treating polyester undrawn yarn by the lateral stretching method, the fluorine crab polymer is adsorbed to 0.5 to 1.0% by weight based on the weight of the fiber as a water repellent, followed by drying and curing in an oven at 240 to 270 ° C. for 0.1 to 1.5 seconds. A method for producing a water repellent polyester fiber, characterized in that. The method for producing a water-repellent polyester fiber according to claim 1, wherein the adsorption is carried out in an emulsion in which a water repellent is dispersed in an aqueous solution so as to have a fluorine content of 5 to 10% by weight. The method for producing a water repellent polyester fiber according to claim 1 or 2, wherein the water repellent agent is a polyperofinate-based water repellent agent. The method of claim 1, wherein the oven is composed of a drying oven and a curing oven, respectively. The fluorine-based water-repellent agent was attached 0.5 to 1.0% by weight with respect to the weight of the fiber, and the fiber was immersed in 0.5% of the dye for 1 hour after breaking strength of 7.5g / d and the dry heat shrinkage of 1% or less, which was tested in 177 ° C air. The water repellent polyester fiber characterized by the anti-wicking property represented by the dye absorption length of ei 10 cm or less. The first row roller group 21, the second row roller group 22, the first hot wind oven 31 for fixing the drawing point, the third row roller group 23, and the fourth row roller group 24 are sequentially The coating liquid 41 is accommodated between the third row roller group 23 and the fourth row roller group 34 of the apparatus for imparting thermal stability to the polyester fiber to be connected, and the coater having the coating roller 42 embedded therein ( 40) is installed, the second hot air oven (32) for coating liquid drying and the third hot air oven (43) for fixing the coating is installed downstream of the coater (40).