KR20170103281A

KR20170103281A - Method for producing the 4-hole hollow-fiber used R-PET

Info

Publication number: KR20170103281A
Application number: KR1020160025850A
Authority: KR
Inventors: 송종복
Original assignee: 주식회사 메이스터
Priority date: 2016-03-03
Filing date: 2016-03-03
Publication date: 2017-09-13

Abstract

The present invention relates to a method for producing a 4-hole hollow fiber using recycled PET. More specifically, the present invention relates to a method for preparing a 4-hole hollow fiber using recycled PET comprising preparing recycled polyethylene terephthalate (R-PET) having an intrinsic viscosity (?) Of 0.48 to 0.73, A second step of putting the crystallized R-PET obtained in the first step into a hopper to dehumidify and dry it to a moisture content of 50 ppm or less, and a second step of drying in a second step The molten R-PET is melted at a temperature of 250 to 290 DEG C by supplying the molten R-PET to an extruder and the molten R-PET of the third step is melted by a gear pump at 70 to 100 kg / A fourth step of supplying the spin pack to a spin pack to which a spinning nozzle including a hollow forming slit is pressurized under pressure to extrude the R-PET supplied into the spinning nozzle, , A spinning speed of 700 to 1,200 m / min A fifth step of obtaining an unstretched yarn by melt-extrusion under the conditions of the first step and the second step, a sixth step of spinning the undrawn yarn obtained in the fifth step through a crossflow quenching chamber through a crossflow quenching chamber, A seventh step of stretching the undrawn yarn and then heat treatment to obtain the long fiber of the drawn yarn; and an eighth step of winding the long fiber of the seventh step on the winding roll at a winding speed of 700 to 1,200 m / min. A method for producing a 4-hole hollow fiber is disclosed.

Description

[0001] The present invention relates to a method for producing a hollow-fiber 4-hole hollow fiber using recycled PET,

The present invention relates to a method for producing a 4-hole hollow fiber using recycled PET.

In recent years, the development of artificial padding for heat insulation using synthetic fibers has been actively carried out mainly in overseas advanced large synthetic fibers. Such synthetic fiber fillers for keeping warm air basically have air between textile tissues similar to natural materials By applying the method of obtaining the warming effect, it is mainly developed as special fiber material such as hollow fiber and microfiber.

Unlike natural materials, synthetic fiber synthetic fillers, which are currently commercialized, have the characteristics of keeping the insulation even when wet, drying faster, and being easy to wash and manage. However, the insulation capacity, chargeability, There is still room for improvement, and research and development are needed to improve it.

The hollow fibers, which are widely used as synthetic fiber fillers, are fibers with pores inside. They melt the spinning solution directly under the claws by using a claw having a non-connected portion during melt spinning to contain air inside the yarn In order to form a hollow portion to be formed.

However, the higher the hollow ratio, the higher the physical properties of the hollow fiber. Generally, in the case of a single-wall construction having a hollow ratio of 10% or more, there is a problem that the cross-section is easily distorted and deformed by an external force, and the inherent properties of the hollow fibers such as heat insulation, heat resistance and rebound resilience are rapidly deteriorated.

On the other hand, the recycled product refers to a product that has already been used, or a product newly produced by using the byproducts generated in the manufacturing process as a raw material, and PET resin is most actively recycled in textile materials.

However, the technology level of domestic recycling fiber related process and application products has not yet reached the level of low-end low-end products. Especially, it is necessary to develop high-efficiency low-energy renewable technology and to develop various environmentally friendly high value-added recycled fiber products.

Therefore, through the application of recycled polyester fibers to nonwoven fabrics and fiber balls based on special composite spinning and multi-ply, three-ply, and bulky forming technologies, It is necessary to overcome the disadvantages of the synthetic filling material and to develop a padded fiber material which can replace the natural derived padding material.

Korean Patent Publication No. 10-2014-0099718. Korean Patent Registration No. 10-1387464.

In the present invention, a method for producing a 4-hole hollow fiber using recycled PET based on the technology of imparting special conjugate spinning (Conjugate, Multi in one, etc.) and multiple holes (4 Hole) And it is possible to overcome the disadvantages of existing artificial synthetic filling materials by applying application technology such as nonwoven fabric of development material and fiber ball, and to provide a lightweight, warmth-like fill power power) 600 or more padding and charge-holding materials.

In the present invention, a melt spinning process capable of obtaining excellent mono-5De grade R-PET 4-hole hollow yarns having a hollow ratio of 18% or more and a hollow formation ratio of 90% or more while ensuring excellent physical properties such as elasticity and warmth, Another object of the present invention is to provide a method for producing a 4-hole hollow fiber using recycled PET.

A method for producing a 4-hole hollow fiber using recycled PET according to the present invention, which solves the above problems, comprises a first step of screw-drying and crystallizing pretreated recycled polyethylene terephthalate (R-PET) having an intrinsic viscosity (?) Of 0.48 to 0.73;

A second step of introducing the crystallized recycled polyethylene terephthalate into a hopper and dehumidifying and drying the resulting product to a water content of 50 ppm or less;

A third step of supplying the dehumidified and dried recycled polyethylene terephthalate to an extruder and melting the same;

A fourth step of supplying the molten recycled polyethylene terephthalate to a spin pack coupled with a nozzle including a hollow forming slit at a gear pressure of 70 to 100 kg / cm 2 with a gear pump and extruding the molten recycled polyethylene terephthalate;

A fifth step of introducing the melt-extruded recycled polyethylene terephthalate supplied to the spin pack into a spinning nozzle to obtain an unstretched yarn under the conditions of a nozzle pressure of 20 to 60 kg / cm 2 and a spinning speed of 700 to 1,200 m / min;

A sixth step of spinning the undrawn yarn through a crossflow quenching chamber;

A seventh step of stretching the undrawn yarn obtained in the sixth step and then heat treating the unstretched yarn to obtain long fibers of the drawn yarn; And

And an eighth step of winding the long fibers of the seventh step at a winding speed of 700 to 1,200 m / min on a winding roll.

Here, the first-step crystallization is characterized by crystallization under the conditions of a temperature of 100 to 180 ° C and a treatment time of about 1 to 3 hours (adjusted according to the size of each chip type).

Here, the dehumidification and drying in the second step is performed under a drying condition at a temperature of 120 to 180 DEG C and a treatment time of 3 to 10 hours.

Here, the spinning nozzle used in the fifth step is a rectangle type nozzle.

Here, the sixth step is performed under a condition that air having an air temperature of 15 ± 2 ° C. and an air velocity of 0.7 to 3 m / s is blown into the spinning tow through a chamber of a honeycomb type.

In the seventh step, the stretching is performed so that the polymer chains are oriented in the fiber axis direction in the yarn spinning. The stretching conditions are 3.5 to 4.8 times in the order of 2 to 4 steps at a drawing bath temperature of 75 to 100 ° C So that the stretching proceeds. At this time, if the stretching ratio is high, the viscosity of the polymer can be increased, but the elasticity may be reduced. Therefore, the stretching ratio is limited within the range of 3.5 to 4.8 times for the effect of high-efficiency FP. At this time, a stretching speed of 30 to 120 m / min is suitable.

The stretched long fiber is characterized by being obtained as a short fiber after heat treatment, followed by a crimping process, a drying process and a cutting process.

The 4-hole hollow fiber manufacturing method using R-PET provided in the present invention has the following effects.

[Technical Aspect]

1. 4-hole hollow fiber, 5De grade, 3-fold, 18% hollow, more than 90% hollow, heat insulation and heat insulation material excellent insulation

2. The obtained hollow fiber can be applied to a wide range of applications such as downpakers, slinging pads, padding, etc., and is stable in moisture and has a semi-permanent performance

3. It can be used as a lightweight, heat-resistant building interior material.

4. New high-value-added high-elasticity recycled PET multi-hollow fibers and natural down-grade synthetic fiber lightweight thermal padding products can be expected to be secured through commercialization and advancement of relevant market and high ripple effect through price competitiveness.

[Economic and Industrial aspects]

1. Improvement of trade balance through substitution of down fillers which depend on existing imports

2. Can be used for other industries as well as apparel products, creating new business

3. Strengthening corporate competitiveness, increasing profits, and stabilizing employment by creating a new product market for high-value-added recycled fiber

4. Improvement of national trade balance and cost reduction due to localization of high-elasticity high-functional short fibers

[Social aspect]

1. No need to extract raw materials from animals such as ducks and geese, so it is environmentally and hygienically effective.

2. It is possible to activate and popularize the outdoor products market by supplying the consumer with less expensive substitute for expensive raw materials.

3. It is made of synthetic fibers by using recycled PET resin material, so it has the effect of reducing 70 ~ 55% of CO2 and 75 ~ 50% of energy compared with the process of producing crude oil. Reduction of environmental pollution, environmental purification, and waste treatment can be drastically reduced.

1 is a block diagram showing an embodiment of a manufacturing method of the present invention.
2 is a process drawing showing an embodiment of the manufacturing method of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of the manufacturing method of the present invention. FIG. 2 is a process diagram showing an embodiment of the manufacturing method of the present invention. Referring to FIGS. 1 and 2, A method for producing a 4-hole hollow fiber using recycled PET according to the present invention is characterized in that pretreated recycled polyethylene terephthalate (R-PET) having an intrinsic viscosity (?) Of 0.48 to 0.73 is prepared and the R- A second step of drying and crystallizing the R-PET obtained in the first step, a second step of putting the crystallized R-PET obtained in the first step into a hopper and dehumidifying and drying the resulting product to have a water content of 50 ppm or less, And a third step of supplying molten R-PET to the extruder under a condition of a melting temperature of 250 to 290 DEG C and a third step of melting the R-PET of the third step with a gear pump at a pressure of 70 to 100 kg / Spin combined with spinning nozzle containing slit (R-PET) supplied to the spin pack is melted and extruded under the conditions of a nozzle pressure of 20 to 60 kg / cm 2 and a spinning speed of 700 to 1,200 m / min when the spin-pack is fed into a spinning nozzle A fifth step of obtaining an unstretched yarn, a sixth step of spinning the undrawn yarn obtained in the fifth step through a crossflow quenching chamber and stretching the unstretched yarn obtained in the sixth step , And a seventh step of obtaining a long fiber of a drawn yarn by heat treatment and an eighth step of winding the long fiber of the seventh step on a winding roll under a condition of a winding speed of 700 to 1,200 m / min.

According to the present invention, the crystallization of the first stage crystallization is performed according to the size of each type of chip, preferably at a temperature of 100 to 180 ° C and a treatment time of 1 to 3 hours.

According to the present invention, preferably, the dehumidification and drying in the second step is preferably carried out under a drying condition at a temperature of 120 to 180 ° C and a treatment time of 3 to 10 hours.

According to the present invention, the spinning nozzle used in the fifth step may be a rectangle type nozzle.

According to the present invention, the sixth step is preferably such that the cross-flow type air blown out at a speed of 0.7-3 m / s from the cooling tube blows out uniformly from the inside to the outside at a temperature of 15 ° C, Cool uniformly. The wind blowing here is controlled by the air conditioner, and the wind keeps constant temperature and the dust is removed.

According to the present invention, it is preferable that the seventh step is performed at 3.5 to 4.8 times in the order of 2 to 4 steps at a drawing bath temperature of 75 to 100 ° C. If the stretching is carried out at a temperature lower than the minimum temperature, a phenomenon (necking phenomenon) may occur where uniform stretching is not achieved and necking occurs. When the stretching temperature is higher than the maximum temperature, There is a problem that the maximum elongation is lowered even though a high elongation tension is applied.

According to the present invention, the 4-hole hollow filament fibers obtained in the above-described production method can be obtained as short fibers after heat treatment, through a crimping process, a drying process and a cutting process. At this time, the nonwoven fabric for padding can be processed using the obtained short fibers.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. However, the following examples are intended to illustrate the present invention and are not to be construed as limiting the scope of the present invention. The present invention can be modified in various ways without departing from the scope of the present invention.

[Examples 1 to 3]

1. Preparation of R-PET: R-PET (Example 1) having an intrinsic viscosity of 0.7 to 0.73 recycled from a waste PET bottle (Example 1), R-PET having an intrinsic viscosity of 0.55 to 0.58 (Example 2) , And an R-PET (Example 3) having an intrinsic viscosity of 0.48 to 0.5 recycled with a spinning scrap is prepared.

Each of the prepared R-PETs was first dried and crystallized at 100 to 180 ° C for 1 to 3 hours, and the crystallized R-PET was fed into a hopper, Followed by dehumidifying and drying under the conditions of a time of 3 to 10 hours, followed by secondary drying such that the water content is 50 ppm or less. The secondary dried R-PET is supplied to an extruder and melted at a temperature of 250 to 290 ° C. The melt of the extruder is transferred to a gear pump, and a spin pack packed with a rectifying glaze type nozzle, which is constituted by including a slit for forming a 4-hole hollow at a gear pressure of 70 to 100 kg / And the melt to be extruded is supplied to the nozzle and spun under the conditions of a nozzle pressure of 20 to 60 kg / cm 2 and a spinning speed of 700 to 1,200 m / min. The radiated undrawn yarn is passed through a cross-quenching chamber and blown uniformly at a temperature of 15 ° C from the inside to the outside with cross-flow air blown from 0.7 to 3 m / s from the cooling tube of the cross- Thereby uniformly cooling the non-drawn filament yarn. The unstretched yarn is put into a drawing bath equipped with a stretching roller, stretched at 3.5 to 4.8 times in the order of 2 to 4 steps at a stretching bath temperature of 75 to 100 ° C to obtain a drawn yarn, A long-fiber four-hole hollow fiber was produced by winding at a speed of 700 to 1,200 m / min.

The properties of each hollow fiber thus produced were measured, and the results are shown in Table 1 below.

Item unit Example 1 Example 2 Example 3 Test Methods Island road den. 5 5 5 KS K0327 burglar g / h 3.4 3.3 3.4 KS K0323 Shindo % 45 48 46 KS K0323 Modulus of elasticity g / h 20 19 20 KS K0323 Hollow rate % 18 18 19 - Hollow formation rate % 92 90 92 - Charge degree FP 620 610 610 IDFB (10-B) Durability to charge and wash FP 550 550 550 IDFB (10-B)

The hollow ratio and the hollow forming ratio in the test methods shown in Table 1 were measured by the following methods.

1) Hollow ratio:

SEM was used to photograph the cross-section of the hollow yarn, and the cross-sectional area and the hollow area were obtained using the area meter of the image analysis program, and the hollow ratio was calculated

2) Hollow formation rate:

SEM is used to photograph the cross-section of the hollow yarn, and then the cross-sectional area is obtained using an area meter of the image analysis program, and the outer diameter (circumference) of the yarn is obtained.

Here, the complete circle is 1,

The square cross section is 0.785,

The positive triangular section shows a value of 0.605.

The filling degree and filling degree and washing durability are measured by Fill Power, and the testing method is IDFB (10-B).

* Test method for IDFB (10-B)

The fill power measurement was performed by placing a sample of 1 oz (Oz, about 28.35 grams) into a 241 mm diameter cylinder and compressing it with a piston for a certain period of time (at least 24 hours) Is used. (It is carried out under conditions of constant temperature, humidity, etc.)

Claims

A first step of screw-drying and crystallizing pretreated recycled polyethylene terephthalate (R-PET) having an intrinsic viscosity (?) Of 0.48 to 0.73;
A second step of introducing the crystallized recycled polyethylene terephthalate into a hopper and dehumidifying and drying the resulting product to a water content of 50 ppm or less;
A third step of supplying the dehumidified and dried recycled polyethylene terephthalate to an extruder and melting the same;
A fourth step of supplying the molten recycled polyethylene terephthalate to a spin pack coupled with a nozzle including a hollow forming slit at a pressure of 70 to 100 kg / cm 2 G with a gear pump and extruding the molten recycled polyethylene terephthalate;
A fifth step of introducing the melt-extruded recycled polyethylene terephthalate supplied to the spin pack into a spinning nozzle to obtain an unstretched yarn under the conditions of a nozzle pressure of 20 to 60 kg / cm 2 and a spinning speed of 700 to 1,200 m / min;
A sixth step of spinning the undrawn yarn through a crossflow quenching chamber;
A seventh step of stretching the undrawn yarn obtained in the sixth step and then heat treating the unstretched yarn to obtain long fibers of the drawn yarn; And
And winding the long fibers of the seventh step at a winding speed of 700 to 1,200 m / min on a take-up roll.

The method according to claim 1,
Wherein the first step crystallization is performed under conditions of a temperature of 100 to 180 DEG C and a treatment time of 1 to 3 hours.

The method according to claim 1,
Wherein the dehumidification and drying in the second step is carried out under a drying condition at a temperature of 120 to 180 DEG C and a treatment time of 3 to 10 hours.

The method according to claim 1,
Wherein the spinning nozzle used in the fifth step is a Rectangular type nozzle.

The method according to claim 1,
The sixth step is controlled by an air conditioner to supply air at a uniform temperature of 15 DEG C through the cooling tube from the inside to the outside in the form of crossflow air blowing at a speed of 0.7 to 3 m / s, Wherein the resin is uniformly cooled and then cooled.

The method according to claim 1,
Wherein the seventh step is carried out under stretching conditions of 3.5 to 4.8 times in the order of 2 to 4 steps with a stretching roller at a stretching temperature of 75 to 100 占 폚.

The method according to any one of claims 1 to 6,
The method for producing a 4-hole hollow fiber using the recycled PET according to claim 1, wherein the long fiber is obtained as a short fiber through a heat treatment, a crimp process, a drying process and a cutting process.