KR101119857B1 - Polyethyleneterephthalate multi-filament for industrial use - Google Patents

Abstract

The present invention provides a polyethylene terephthalate multifilament having a strength of 11.0 g / d or more and toughness of 38 or more in a polyethylene terephthalate multifilament obtained by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.2. The polyethylene terephthalate fiber produced according to the present invention has high modulus, high strength, low elongation, almost no permanent strain, and thus can be used as geogrid, industrial webbing, seat belt, and the like.

Polyethylene Terephthalate, Industrial Yarn, High Strength, Toughness, Multifilament

Description

Polyethylene terephthalate multi-filament for industrial use

The present invention relates to polyethylene terephthalate multifilament fibers having a force-strain curve having a strength of at least 11.0 g / d and a toughness of at least 38. The multifilament fibers according to the present invention have high strength, high modulus and low elongation, and can be applied to the production of industrial high strength polyester fibers used as materials for industrial ropes, civil reinforcement, webbing or seat belts.

A useful conventional method for increasing the strength of polyester fibers used for industrial purposes is the unstretched yarn obtained by melting high viscosity chips with an intrinsic viscosity of 1.0 or more, then sufficiently melting the molten polymer by heating it to 300 ° C, solidifying it, and winding it in a low speed roller. Was directly stretched to a draw ratio of 6.0 in the first and second stages, and then wound and wound. At this time, the orientation of the undrawn yarn was lowered by a low-speed winding, and a high magnification was applied to obtain high strength properties. The physical properties of the polyester yarn manufactured by the conventional method as described above have a strength of 10.5 g / d or less and 11 to 15% of elongation.

When using a conventional spinning technique to increase the draw ratio in order to obtain a higher strength of the fiber, a lot of process problems and a lot of fin yarns are generated, resulting in a lot of spinning thread, the post-processability worsens. Therefore, it is difficult to obtain high-strength yarns using existing technologies due to rising manufacturing costs and deterioration of product quality.

Fiber according to the present invention is to control the polyethylene terephthalate polymer speed under the nozzle and the speed of the high roller No. 1 (8) so as to increase the draw ratio to enable the production of high strength polyethylene terephthalate at the same draw ratio of the prior art It is prepared according to the method.

According to a preferred embodiment of the present invention, in the method for producing a polyethylene terephthalate multifilament for spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.2, the temperature of the polyethylene terephthalate in the extender 1 is from 290 to 305 ℃, the temperature of the polyethylene terephthalate passing through the gear pump (2) is 295 ~ 310 ℃, the diameter of the nozzle hole of the spinneret (3) is 0.4 ~ 0.6mm, the hole length and hole diameter of the spinneret (3) The ratio (L / D) is 2 to 4, the radiation draft is 60 to 70, the length of the hood heater 4 is 400 to 600 mm, the temperature of the hood heater 4 is 360 to 390 ° C, and rapid cooling The air supply amount of the chambers 5 and 6 is 20-70 mmAq, and the exhaust amount is 30-80 mmAq, The manufacturing method of the polyethylene terephthalate multifilament is provided.

According to another suitable embodiment of the present invention, a polyethylene terephthalate multifilament having a strength of 11.0 g / d or more and a toughness of 38 or more provides a polyethylene terephthalate multifilament.

According to another suitable embodiment of the present invention, the polyethylene terephthalate multifilament has a fineness of 4 to 30 denier of the monofilament, and the monofilament consists of 100 to 600 aggregates in number.

According to another suitable embodiment of the present invention, the fineness of the polyethylene terephthalate multifilament is from 400 denier to 30,000 denier.

According to another suitable embodiment of the present invention, there is provided one industrial product selected from the group consisting of industrial ropes, civil engineering reinforcements, webbing and seat belts comprising a high strength polyethylene terephthalate multifilament.

The present invention is to maintain the inherent properties of the polyester chip itself to the maximum and to optimize the spinning conditions, spinning workability and industrial rope, civil reinforcement material having a high modulus, high strength, low elongation due to the stretching of high magnification, Industrial super-strength polyester yarns useful for webbing, seat belts, and the like can be prepared.

The present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, a polyester chip having an intrinsic viscosity in the range of 0.8 to 1.2 is melted by setting the temperature condition of the extender 1 low. At this time, the temperature of the molten polymer was set to 290 to 305 ° C. If the temperature of the polymer is lower than 290 ℃ the polymer is not evenly melted spinning is difficult, and if higher than 305 ℃ the viscosity of the polymer is lowered difficult to express high strength. In addition, a temperature is provided to insulate the gear pump 2, and in this case, the set temperature of the insulation of the gear pump 2 is lowered so that the temperature of the polymer passing through the gear pump 2 can be 295 to 310 ° C. Adjusted. When the temperature of the polymer is lower than 295 ° C., the spinning workability is not good, and when the temperature of the polymer is higher than 310 ° C., thermal decomposition occurs due to high temperature, thereby losing high strength properties. The diameter of the nozzle hole of the spinneret 3 was 0.4-0.6 mmφ. When the nozzle hole diameter was 0.4 mmφ or less and 0.6mmφ or more, the radioactivity was not good. The ratio (L / D) of the hole length and the hole diameter of the spinneret 3 was 2 to 4. When the ratio (L / D) of the hole length and hole diameter of the spinneret 3 was less than 2, the radioactivity was not good, and when the ratio (L / D) was more than 4, the pack pressure increased and the radioactivity was not good. It keeps the spinning draft between 60 and 70 and gives high stretch on the roller. When the radiation draft was less than 60, the radiation pack pressure was increased and the radioactivity was not good. When the radiation draft was over 70, it was difficult to express the high strength of the yarn. The length of the hood heater (4) was radiated to 400 ~ 600mm. When the hood heater was less than 400mm, the radioactivity was not good, and when the hood heater was more than 600mm, it was difficult to install the hood heater more than 600mm because it affected the portion of the radiating rapid cooling system. By raising the temperature of the hood heater 4 to 360 ~ 390 ℃ to create an atmosphere in the hood so that the spun fibers can be as amorphous and oriented as possible. If the temperature of the hood heater is less than 360 ℃ the radioactivity was not good, if the temperature of the hood heater is more than 390 ℃ overloading the heater it was difficult to raise any more temperature. The amorphous, non-orientated yarn thus formed can be rapidly cooled by using air. At this time, the air supply amount was 20 to 70 mmAq (aqua) and the exhaust amount was 30 to 80 mmAq. If the grade and the displacement were less than 20 and 30 mmAq, respectively, the polymer did not solidify evenly, and the radioactivity was not good. After the solidified yarn in the amorphous, non-orientated state passes through an appropriate amount of oil ring 7, it is relaxed between the roller roller GR 4 (11) and GR 5 (12) and wound up on the winder 13.

The polyethylene terephthalate multifilament of the present invention has a fineness of 4 to 30 denier of the monofilament, and the monofilament consists of 100 to 600 aggregates. If the fineness of the monofilament is less than 4 denier, the occurrence of the wool is serious, the quality of the yarn is poor, the strength is insufficient, and if it exceeds 30 denier, the cooling of the untwisted yarn is difficult, the elongation of the yarn is inferior. If the number of monofilament is less than 100, the strength is not sufficient as an industrial company, and if more than 600, it is difficult to uniformly cool un-twisted yarn.

According to another suitable embodiment of the present invention, the fineness of the polyethylene terephthalate multifilament is from 400 denier to 30,000 denier. If the fineness of the multifilament is less than 400 denier, the strength is not sufficient as an industrial company, and if the fineness of the multifilament exceeds 30,000 denier, the uniform cooling of the non-twisted yarn is difficult and the elongation is poor.

2 is a force-strain curve for multifilaments of the present invention and conventional 1000D polyethylene terephthalate filaments.

According to the present invention, the process used to form the force-strain curve is an atmosphere within the hood so that the polyethylene terephthalate monofilament can have a structure that is as amorphous and unoriented as possible upon passing through the Hood Heater 4. It provides a, and the step of cooling the amorphous, non-orientated yarn thus formed in the cooling zone (5, 6) to maintain the amorphous, unoriented state to the maximum to enable the operation at a high draw ratio.

Polyethylene terephthalate monofilament produced through such a process is composed of 100 to 400 aggregates of polyethylene terephthalate monofilament is good in terms of appearance and fin yarns with good spinning workability, strength is 11.0 g / d, modulus 120 ~ 140 g / d, toughness of 37 to 40 or less, can be widely used as industrial polyester fibers useful for industrial ropes, civil reinforcement, webbing, seat belts and the like.

The physical property evaluation of an Example and a comparative example was measured or evaluated 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. Hold for 10 minutes and find the number of seconds the solution is falling. 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 method of modulus and elongation of multifilament

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) Toughness

Intensity (g / d) X √ Obtain it using the section.

4) Draft

The speed of GR 1 (8) was calculated as the value divided by the speed of the polyethylene terephthalate polymer directly under the nozzle.

5) elongation ratio

The speed of GR 4 (11) divided by the speed of GR 1 (8).

[Examples 1 to 7]

Polyetherene terephthalate chip having an intrinsic viscosity of 1.00 is melted through an extruder, filtered using a 30 μm nonwoven fabric or a 400 mesh metal filter using a pack filter, and then filtered. Extruded molten polymer through a nozzle with 192 holes and passed a hood heater with a length of 600mm under the conditions of 360 ~ 380 ℃, cooled with 15 ℃ of air, and then concentrated to maintain oil content in the yarn of 0.6 ~ 0.8%. After oiling, the draft, which is a ratio of the speed of the GR 1 (8) directly under the nozzle, was fixed at 65, stretched through the rollers in multiple stages, and wound up under the spinning conditions shown in Table 1.

[Table 1]

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Total draw ratio 6.3 6.4 6.5 6.3 6.3 6.3 6.3 Cooling air pressure
Intake / Exhaust
(mmAq) 20/30 20/30 20/30 60/70 20/30 20/30 20/30 Filter specifications Non-woven
(30 μm) Non-woven
(30 μm) Non-woven
(30 μm) Non-woven
(30 μm) Non-woven
(30 μm) 400mesh Non-woven
(30 μm) Oil in yarn
content(%) 0.6 0.6 0.6 0.6 0.6 0.6 0.8 Hood heater
Length (mm) 600 600 600 600 600 600 600 Hood heater
Temperature (℃) 360 360 360 360 380 360 360 Draft 65 65 65 65 65 65 65 Toughness 38.5 38.0 38.0 39.1 38.4 38.3 38.5 Yarn strength
(g / d) 11.1 11.2 11.3 11.1 11.0 11.0 11.1 Body cut (%) 12.0 11.5 11.3 12.4 12.2 12.1 12.0

Comparative Example 1

The main conditions are the same as in the above embodiment, and the draft is 93.

Comparative Example 2

The main conditions are the same as those of Comparative Example 1, and the intake air displacement of the cooling air pressure is 100/110 mmAq.

Comparative Example 3

The main conditions were the same as in Comparative Example 1, and the filter inside the pack was filtered to 100 mesh.

[Comparative Example 4]

Main conditions were the same as in Comparative Example 1, and the oil content of the yarn was 0.3%.

[Comparative Example 5]

Main conditions are the same as in Comparative Example 4, and the draft is 65.

[Comparative Examples 6, 7, 8]

The main conditions are the same as those of Comparative Example 1, and the lengths of the hood heaters are 200, 400, and 600 mm.

TABLE 2

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Total draw ratio 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 Cooling air pressure
Intake / Exhaust
(mmAq) 20/30 100/110 20/30 20/30 20/30 20/30 20/30 20/30 Filter specifications Non-woven
(30 μm) Non-woven
(30 μm) 100mesh Non-woven
(30 μm) Non-woven
(30 μm) Non-woven
(30 μm) Non-woven
(30 μm) Non-woven
(30 μm) Oil in yarn
content(%) 0.6 0.6 0.6 0.3 0.3 0.6 0.6 0.6 Hood heater
Length (mm) 600 600 600 600 600 200 400 600 Hood heater
Temperature (℃) 360 360 360 360 360 360 360 320 Draft 93 93 93 93 65 93 93 93 Toughness 35.6 36.0 36.4 36.2 36.6 36.0 35.0 36.2 Yarn strength
(g / d) 10.5 10.4 10.3 9.9 10.0 9.8 9.7 10.5 Body cut (%) 11.5 12.0 12.5 13.4 13.5 13.5 13.0 11.9

Figure 1 schematically shows a manufacturing process of polyethylene terephthalate multifilament according to the present invention.

Figure 2 is a force-strain curve for monofilaments of the present invention and conventional 1000D polyethylene terephthalate multifilament.

Claims (5)

In the manufacturing method of polyethylene terephthalate multifilament spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.2, The temperature of the polyethylene terephthalate in the extruder 1 is 290-305 degreeC, the temperature of the polyethylene terephthalate which passes through the gear pump 2 is 295-310 degreeC, and the diameter of the nozzle hole of the spinneret 3 is 0.4 ~ 0.6mm, the ratio (L / D) of the hole length and hole diameter of the spinneret 3 is 2 to 4, the radial draft is 60 to 70, the length of the hood heater 4 is 400 to 600mm, The temperature of the hood heater (4) is 360 ~ 390 ℃, the air supply amount of the rapid cooling chamber (5, 6) is 20 ~ 70mmAq, the exhaust amount is 30 ~ 80mmAq method of producing a polyethylene terephthalate multifilament. The method according to claim 1, wherein the strength of the polyethylene terephthalate multifilament is 11.0g / d or more, toughness is 38 or more. The method of claim 1, wherein the polyethylene terephthalate multifilament has a fineness of 4 to 30 deniers of the monofilament, and the monofilament comprises 100 to 600 aggregates. The method according to claim 1, wherein the fineness of the polyethylene terephthalate multifilament is 400 denier to 30,000 denier manufacturing method of polyethylene terephthalate multifilament. delete

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