KR20070072032A - Industrial high-strength polyester fiber with less permanent deformation-rate and its manufacturing method - Google Patents

Abstract

An industrial high-strength polyester fiber with a low permanent transformation-rate is provided to control the condition of the hood temperature and the quenching air temperature, thereby offering the excellent work property. A polyester chip with the inherent viscosity of 1.0 is melted, spun and drafted so that the high strength polyester fiber is manufactured. At the manufacturing process, the temperature of the hood heater(1) is 400 to 500 degrees centigrade and the quenching air temperature is 10 to 16 degrees centigrade so that the spun mono filament has the non-oriented structure. A proper amount of oil is imparted into the solidified yarn by an oiling roller(4) and then previously drafted at the godet rollers(GR2,GR3). The solidified yarn is secondly drafted by the godet rollers(GR3,GR4) with the high ratio and relaxed and wound by the godet rollers(GR4,GR5). The polyester fiber manufactured by the above process has the strength of above 10.6 g/d, the cut elongation rate of below 12% and the permanent transformation rate of below 1%. The polyester chip is melted by an extruder.

Description

Industrial high-strength polyester fiber with less permanent deformation-rate and its manufacturing method

1 is a manufacturing process schematic diagram of the present invention.

Figure 2 is a graph of elongation change with time of yarn.

The present invention relates to an industrial high-strength polyester fiber with a low permanent deformation rate and a method of manufacturing the same, and more particularly, to geogrid, webbing, etc., having high modulus and low elongation characteristics. The present invention relates to an industrial high strength polyester fiber used and a method of manufacturing the same.

In the conventional method for increasing the strength of polyester fibers, after melting a high viscosity chip having an intrinsic viscosity of 1.0 or higher, the molten polymer temperature is raised to 310 ° C to sufficiently melt, and the hood length is set to 280 mm and the rearward temperature to 340 ° C, and quenched. The temperature of the air is 16-18 ° C. to solidify the polymer. Subsequently, the unstretched yarn obtained by winding at a low speed roller was stretched directly to a draw ratio of 6.0 in one and two stages, and then wound by winding.

At this time, the orientation degree at the time of unstretching was lowered by low speed winding, the high magnification of stretching was given, and the fiber of high strength was obtained. The physical properties of polyester yarns manufactured by the above methods and widely used in products such as industrial ropes were modulus of 60 g / d to 80 g / d, strength of 9.5 g / d or less, 13 to 18%, and permanent strain of 1.5% or more. .

In order to obtain higher strength by using a conventional spinning technique, when the stretching ratio is increased than the conventional stretching ratio, process problems and quality problems that cause many yarns are generated, resulting in poor post-processability. Therefore, it is difficult to obtain high-strength yarn with the existing technology due to the increase of manufacturing cost and the deterioration of product quality.

The present invention is to control the conditions of the hood temperature and the quenching air temperature to excellent spinning workability even at a draw ratio higher than the conventional draw ratio of 6.3 or more, so that the industrial high-strength polyester of more than 10.6g / d strength and less than 1% permanent strain The technical challenge is to make the fiber.

The present invention relates to industrial high-strength polyester fiber and a method of manufacturing the same, and more particularly, melt-extruded polyester chips having an intrinsic viscosity of 1.0 to spin through nozzles of spinnerets, and the hood heater temperature is 400 to 500 ° C. , Quenching air temperature is 10 ~ 16 ℃, and the spinning oil is applied just before winding and drawn at high draw ratio through high-pressure roller, so it is excellent in spinning workability, strength is more than 10.6g / d, stretching is less than 12%, permanent strain rate The present invention relates to a polyester yarn which is less than 1% and a production method thereof.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Polyester chips with an intrinsic viscosity of 1.0 are melted in an extruder. By raising the temperature of the hood heater 1 to 400 to 500 ° C., the temperature of the quenching air in the hood is lowered to 10 to 16 ° C. so that the radiated monofilament can have an amorphous and unoriented structure as much as possible. 3) Let it be. After applying the appropriate amount of oil in the oiling roller (4), the solidified yarn is preliminarily stretched in the high rollers GR 2 and GR 3, and then the second high ratio is drawn in the high rollers GR 3 and GR 4. Relax on wind rollers GR 4 and GR 5 and wind up.

Polyester yarns produced in such a process have good spinning performance, good yarn quality, high strength and modulus, low cutting and permanent strain, and thus can be useful for geogrid and webbing applications.

The method of performing the physical property evaluation in the Example and the comparative example was done as follows.

1) Intrinsic viscosity (I.V.)

After dissolving 0.1 g of the sample in a reagent (90 ° C.) mixed with phenol and 1,1,2,2-tetrachloroethanol 6: 4 (weight ratio) for 90 minutes, transfer to a Ubbelohde viscometer and place it in a 30 ° C. thermostat. The solution is held for 10 minutes at, and the drop seconds of the solution are obtained by using a viscometer and an aspirator. The number of seconds of falling of the solvent can also be obtained by the following equations obtained from the above equations. The value was calculated.

R.V. = Number of drops of solvent / number of drops of solvent

IV = 1/4 × (RV-1 / concentration CO ₄ ) + 3/4 × (In RV / concentration)

2) Measuring modulus and elongation of yarn

After leaving the yarn in a standard condition, that is, a constant temperature and humidity chamber at a temperature of 25 ° C. and a relative humidity of 65% for 24 hours, the sample is measured by a tensile tester using the ASTM 2256 method.

3) Workability

Observe for 24 hours at a location on the spinner to determine the number of trimmings on the high roller.

4) permanent strain

The yarn is left for 24 hours in a standard condition, that is, a constant temperature and humidity room with a temperature of 25 ° C. and a relative humidity of 65%. Give a load equal to 10% of the yarn strength and leave it for more than 6,000 minutes before removing the load to measure the elongation. (L ₀ : Length measured under ultra-load (0.01 g / d) after leaving the sample at standard condition for 24 hours, L ₁ : Length of the sample under ultra-load (0.01 g / d) after removing it after applying a certain time load) )

Examples 1-5 and Comparative Examples 1-6;

A polyester chip with an intrinsic viscosity of 1.00 was extruded through a nozzle with a diameter of 0.6 mm, a length and diameter ratio (L / D) of 3, and a hole of 192 holes. 1500 deniers were spun and stretched under the spinning conditions shown in Table 1 at the speed of the chop roller GR 4 at a speed of 2700 m / min, and the permanent strain of the obtained yarn was measured (Fig. 2).

TABLE 1

The present invention optimizes the temperature of the hood heater and the quenching air temperature, thereby producing industrial high strength polyester fibers with high modulus, high strength, low elongation, and low permanent strain.

Claims (2)

In the process of spinning and stretching industrial polyester fibers in a one-step process using a polyester chip having an intrinsic viscosity of 1.0, the hood heater is manufactured at 400 to 500 ° C and the quenching air temperature is set at 10 to 16 ° C. A method for producing an industrial high strength polyester fiber with a small permanent strain. Industrial high strength polyester fiber with low permanent strain, characterized by the method of claim 1 and having the following physical properties.  Below (1) strength of at least 10.6 g / d,  (2) less than 12% of the body; (3) Permanent strain is 1.0% or less (at load less than 10% of yarn strength)

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