KR101718504B1 - Preparing method of recycling fiber using waste scrap comprising secondary extruding process - Google Patents

Abstract

The present invention provides a preparation method of recycled fibers using waste scraps comprising a secondary extrusion process, comprising the steps of: collecting and crushing scraps left after cutting automobile interior fiber materials containing polyester fibers; mixing the crushed scraps with 30-50 parts by weight of a terephthalic acid and ethylene glycol copolymer film with respect to 100 parts by weight of the scraps, and extruding the mixture by performing a first extrusion process at 10-300C to prepare a first melted material from which impurities and polyester carbides are extracted; extruding the first melted material by performing a second extrusion process, introducing the same into a filter to extract remaining impurities and polyester carbides from the first melted material, thereby producing a second melted material; molding the second melted material into pellets; and mixing the pellets with 50-150 parts by weight of a plastic resin with respect to 100 parts by weight of the pellets and extruding the mixture to produce recycled fibers. Accordingly, as the impurities and low-melting point polyester carbides generated when performing the first extrusion process of the cut and discarded polyester fiber interior material scraps are efficiently removed through the second extrusion process involving filtration using a filter, the present invention can produce high-quality recycled polyester fibers.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for producing recycled fibers using a waste scrap including a secondary extrusion process,

The present invention relates to a method for producing regenerated fiber using a waste scrap including a secondary extrusion process, and more particularly, to a method for producing regenerated fiber including a secondary extrusion process, which includes an additional extrusion process to reduce the content of impurities and low melting point polyester carbide ≪ / RTI >

The fiber interior material generally used as an automobile interior material is made by mixing polypropylene (PP), polyethylene terephthalate (PET) and vegetable fiber to produce a fiber interior material having a certain size, Which is used by being cut to fit the shape size of the attachment surface of the automobile.

Such fiber interior materials are used for cushioning, insulation, sound absorption and sound insulation, which are attached between the steel and the inner surface of the outer peripheral surface of automobile. Mixing only polypropylene and polyethylene terephthalate results in low thermal insulation due to high thermal conductivity, And low-temperature vegetable fibers are mixed together to make fiber interior materials.

In this way, the fiber interior material used as an automobile interior material is made of a fiber interior material having a certain size surface, cut and adhered along the attachment surface of the automobile, and the scrap (piece, garbage) And 100% is being abandoned.

The amount of scrap of discarded fiber interior material is now more than 100 ~ 150t on average per month, which is gradually increasing. The incineration cost is about 200,000 won per 1t, There is a problem that a scrap processing cost of about 30,000,000 won or more occurs even if a minimum of 30t of scrap is generated in a month.

In addition, there has been a problem of causing air pollution by incineration and treatment of the fiber interior material, which is an industrial waste, and causing various environmental pollution such as soil pollution caused by incineration of the remaining material after incineration.

In order to solve the above-mentioned problem, scrap of fiber interior material is recycled so as to prevent environmental pollution, and at the same time, various kinds of regenerated fiber are manufactured by using it, thereby reducing the mixing ratio of the plastic resin raw material, A recycling method capable of drastically reducing the processing cost has been proposed.

However, in the extrusion process of the scraps of the fiber interior material, a low melting point polyester carbide is produced due to the high temperature of 200 ° C or more, and the quality of the regenerated fiber is deteriorated and development of mass production is delayed due to the remaining low melting point polyester carbide.

Therefore, it is urgent to research and develop a method for reducing the amount of low-melting-point polyester carbide remaining in order to mass-produce high-quality regenerated fibers.

Korean Patent Publication No. 2013-0010566

An object of the present invention is to provide a recycling method and a manufacturing method of a recycled fiber using waste scrap including a secondary extrusion process capable of producing a high quality regenerated fiber by efficiently expelling a low melting point polyester carbide produced in the process of extruding scraps of fiber interior materials, And to provide a method for producing a fiber.

In order to accomplish the above object, the present invention provides a method of manufacturing an automobile fiber interior material comprising polyester fibers, the method comprising the steps of: collecting and shredding remaining scrap; The shredded scrap and 30 to 50 parts by weight of terephthalic acid and ethylene glycol copolymer film are mixed with 100 parts by weight of scrap and then extruded at 10 to 300 ° C in a first extrusion step to remove impurities and a first melt from which polyester carbide is extracted Preparing; Extruding the first melt in a second extrusion process, introducing the first melt into a filter, preparing a second melt in which impurities remaining in the first melt and polyester carbide are removed; Molding the second melt to produce a pellet; And a second extrusion step comprising mixing the pellet and 50 to 150 parts by weight of a plastic resin with respect to 100 parts by weight of the pellets and spinning to prepare a regenerated fiber, .

The present invention also provides a regenerated fiber produced by the above production method, wherein impurities and polyester carbide are removed.

The method for producing regenerated fiber using waste scrap including the secondary extrusion process according to the present invention is characterized in that the impurities generated in the primary extrusion process of the polyester fiber interior scrap, which is cut and discarded, and the low- Type secondary extrusion process to efficiently remove impurities and low-melting-point polyester carbide, thereby producing a high-quality recycled polyester fiber.

1 is a view showing a filtration flow chart for discharging impurities and low-melting-point polyester carbide during a secondary extrusion process,
Fig. 2 is a flowchart showing a process for producing a regenerated fiber utilizing waste scrap including a secondary extrusion process of the present invention,
3 is an FE-SEM image of the regenerated fiber of the present invention when 2Zone carbonization according to Experimental Example 1 is carried out,
4 is an FE-SEM image of the regenerated fiber of the present invention when 4Zone carbonization according to Experimental Example 1 is carried out,
5 is an FE-SEM image of the regenerated fiber of the present invention when low-temperature carbonization according to Experimental Example 1 is carried out, and FIG.
6 is an FE-SEM image of the regenerated fiber of the present invention when high-temperature carbonization according to Experimental Example 1 was carried out,
7 is a cross-sectional view (a) of the regenerated fiber produced according to Comparative Example 1 and a sectional view (b and c) of the regenerated fiber produced according to Example 1,
8 is a diagram illustrating an experimental procedure according to Experimental Example 2,
9 is a view showing the evaluation of a sound absorption test according to Experimental Example 2. Fig.

Hereinafter, a method for producing recycled fiber utilizing waste scrap including a secondary extrusion process of the present invention will be described in more detail.

The inventors of the present invention have found that impurities and low-melting-point polyester carbide can be efficiently removed through a secondary extrusion process using a filtration method using an impurity and a low melting point polyester carbide generated in a first extrusion process Thereby completing the invention.

The present invention relates to an automobile fiber interior material containing polyester fibers, which is produced by cutting and scrapping the scraps remaining after cutting; The shredded scrap and 30 to 50 parts by weight of terephthalic acid and ethylene glycol copolymer film are mixed with 100 parts by weight of scrap and then extruded at 10 to 300 ° C in a first extrusion step to remove impurities and a first melt from which polyester carbide is extracted Preparing; Extruding the first melt in a second extrusion process, introducing the first melt into a filter, preparing a second melt in which impurities remaining in the first melt and polyester carbide are removed; Molding the second melt to produce a pellet; And a second extrusion step comprising mixing the pellet and 50 to 150 parts by weight of a plastic resin with respect to 100 parts by weight of the pellets and spinning to prepare a regenerated fiber, .

In one embodiment of the present invention, the polyester fibers may comprise low melt polyester fibers. The low melting point polyester fiber satisfies a weight of at least 300 g per square meter and is mixed with ordinary polyester fibers to serve as an adhesive between the polyester fibers and has a low temperature melting point, If it is heated, it has a characteristic of being carbonized, and a process of removing it at the time of regeneration is essential.

The polyester includes, but is not limited to, a low melt polyester fiber.

The terephthalic acid and ethylene glycol copolymer film may be a biaxially stretched film polymerized by ester bonding of terephthalic acid and ethylene glycol. More specifically, SKEL Polyester Film's Skyrol product may be used, but is not limited thereto.

The terephthalic acid and ethylene glycol copolymer film may be contained in an amount of 30 to 50 parts by weight or 35 to 45 parts by weight based on 100 parts by weight of crushed scrap, but are not limited thereto.

The first step of preparing the first melt may include a first step of raising the temperature to 200 to 300 ° C at 10 to 50 ° C, a second step of raising the temperature to 200 to 300 ° C at 50 to 100 ° C, a second step of raising the temperature to 200 to 300 ° C at 100 to 150 ° C, Lt; 0 > C, and the third step of raising the temperature to < 0 > C.

The step of preparing the first melt may be carried out in a rotary reaction tank having a RPM of 950 to 2000 or RPM of 1000 to 1500, and the temperature may be raised by the rotational friction heat. The pellet may be prepared by heating the molten product with water.

The secondary extrusion process can be extruded at a temperature of 250 to 300 DEG C, a pressure of 80 to 120 kgf / m < ² >, and a feed rate of 50 to 80 rpm.

Particularly, it is more preferable that the secondary extrusion process is carried out at a temperature of 270 캜, a pressure of 100 kgf / m ² , and a conveying speed of 62 rpm. The temperature of 270 DEG C and the pressure of 100 kgf / m < ² > should be kept constant. When the feed rate exceeds 62 rpm, impurities and low melting point polyester carbide are not filtered on the filter, Thus, it is more preferable to perform the secondary extrusion process at the above temperature, pressure, and feed rate.

The filter may be a wire mesh structure of 40 to 60 mesh, but is not limited thereto.

The plastic resin may be at least one selected from the group consisting of polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), ABS (Acrylonitrile, Butadiene, Styrene) and polycarbonate Polyethylene terephthalate (PET), which is a polyester resin, may be used. The blending ratio of the pellet from which the low melting point polyester fiber of the present invention is extracted to the new plastic resin can be adjusted according to the performance of the desired product. Preferably, 50 to 150 parts by weight of the plastic resin, 70 to 130 parts by weight, By weight or 80 to 120 parts by weight may be used, but the present invention is not limited thereto.

The mixture in which the regenerated pellets and the new material are mixed can be made into an automotive interior material through a suitable processing procedure which is usually carried out in the art. Specifically, the spinning and twisting steps may be performed to produce the recycled fiber, and in addition, the cardboard and needle punching process may be used to produce a vehicle interior material having excellent sound absorbing effect.

Meanwhile, in the present invention, the fiber interior material containing polyester fiber is used as an interior material for automobile and the pellet is manufactured through the remaining scrap. However, it is exemplified that the fiber interior material used for various architectural interior materials is modified .

The present invention also provides a regenerated fiber produced by the above production method, in which impurities and polyester carbide are removed.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited by these examples.

≪ Example 1 >

Among the automobile fiber interior materials containing polyester fibers, the scraps left after cutting were obtained at the scrap collection site and were pulverized into a size of 100 × 100 mm. Since the scrap of the fiber interior material is cut regardless of the size and all the remaining amount is collected, the incineration cost and the waste contribution amount for incinerating the scrap are not generated at all, thereby greatly reducing the disposal cost of the garbage.

30 wt% of Skyrol Polyester flim was mixed and melted at a friction temperature of 200 to 230 캜 and a RPM of 1230-1250.

The melting was performed three times in total at one cycle at 10-220 占 폚, two cycles at 100-220 占 폚, and three cycles at 100-220 占 폚. Through this process, a first melt in which the impurities contained in the scrap and the low-melting-point polyester carbide were removed was prepared.

Referring to FIG. 1, there is shown a schematic view of a filter and an extrusion process used in a secondary extrusion process. The first melt was extruded through a secondary extrusion process at a temperature of 270 DEG C, a pressure of 100 kgf / m < ² > and a conveying speed of 62 rpm, and introduced into a filter made of a 50 mesh wire net. The second melt, from which the low melting point polyester carbide was extracted, was molded to produce pellets.

Polyester flakes were mixed with the pellets and the new material at a weight ratio of 1: 1, dried at a heating temperature of 220 ± 5 ° C and a feed rate of 34 kg / min for 4 to 5 hours in a heating medium drying manner and then spun. The spinning was carried out under the condition of cooling temperature of 5 ~ 10 ℃ and De 'of 6 ~ 15 mm in RPM 53 ~ 55 dml rotary mixer. After that, the primary water temperature was changed to 75 ± 5 ° C and the secondary water temperature was changed to 80 ± 5 ° C.

≪ Comparative Example 1 >

Regenerated fiber was produced under the same conditions as in Example 1 except that the secondary extrusion process was not performed.

<Experimental Example 1> Analysis of content of impurities and low melting point polyester carbide present in regenerated fiber

In order to analyze the surface of the regenerated fiber produced according to Example 1, field emission scanning electron microscope analysis (FE-SEM) was performed.

3 to 6, impurities and low-melting-point polyester carbide are filtered through a filter made of a 50-mesh wire mesh through a secondary extrusion process, whereby impurities and low melting point polyesters It was confirmed that the content of carbide was remarkably decreased.

7 (a)) and the cross section of the regenerated fiber produced according to Example 1 (Fig. 7 (b) and Fig. 7 (c ), It was confirmed that the LM carbide component was remarkably decreased.

&Lt; Comparative Example 2 > Production of fiber containing only polyester new material

A fiber containing only polyester neodymium without regenerated fiber was prepared.

&Lt; Experimental Example 2 > Sound absorption rate comparison

840 X 840 mm test specimens prepared in accordance with Example 1 and Comparative Example 1 and Comparative Example 2 were taken and subjected to a sound absorption test using the alpha-CABIN test equipment in accordance with the provisions of 5.131 of MS341-18 of the FITI test institute Respectively. The results are shown in Table 1 below.

Hz 400 500 630 800 1000 1250 2000 2500 3150 4000 5000 MS SPEC 0.008 0.025 0.036 0.085 0.16 0.18 0.33 0.35 0.51 0.57 0.66 Play FIBER
(Example 1) 0.02 0.03 0.07 0.09 0.21 0.24 0.37 0.39 0.57 0.59 0.69 Play FIBER
(Comparative Example 1) 0.01 0.03 0.04 0.09 0.20 0.21 0.37 0.39 0.55 0.59 0.69 NEW FIBER
(Comparative Example 2) 0.04 0.06 0.09 0.12 0.27 0.29 0.39 0.43 0.59 0.63 0.76

As shown in Table 1 and FIG. 9, it was found that the sound absorption ratio of the recycled fiber according to the present invention is similar to that of the standard recycled fiber. As a result, it is possible to reduce the manufacturing cost of the product and recycle scraps of the fiber- Can be usefully used.

&Lt; Experimental Example 3 >

The fibers prepared according to Example 1 and Comparative Example 1 and Comparative Example 2 were subjected to the FITI test institute to analyze the components and characteristics, and the results are shown in Table 2 below.

NO Test Items Play FIBER
(Example 1) Play FIBER
(Comparative Example 1) NEW FIBER
(Comparative Example 2) One Finish: Denier 7.76 7.22 7.50 2 Specific strength: cN / Denier (g / denier) 3.48 2.98 3.52 3 Shinto:% 61 82 58 4 Number of crimp: ea / 25 mm 8.7 8.8 9.9 5 Shrinkage:% 3.2 7.7 2.9 6 Water content:% 1.1 1.6 1.43 7 Daylight fastness: grade 4 4 4

Referring to Table 2, it can be seen that the regenerated fiber of the present invention has similar properties to those of Comparative Example 2, and the regenerated fiber produced by reusing the scrap through Example 1 is similar to that of conventional fibers , Respectively.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various modifications and changes may be made without departing from the scope of the appended claims.

Claims (9)

A step of collecting and shredding scrap from the automobile fiber interior material containing polyester fibers;
The shredded scrap and 30 to 50 parts by weight of terephthalic acid and ethylene glycol copolymer film are mixed with 100 parts by weight of scrap and then extruded at 10 to 300 ° C in a first extrusion step to remove impurities and a first melt from which polyester carbide is extracted Preparing;
Extruding the first melt through a second extrusion process, introducing the first melt into a filter having a wire mesh structure of 40 to 60 mesh, preparing a second melt from which residual impurities and polyester carbide are removed from the first melt;
Molding the second melt to produce a pellet; And
Mixing the pellet and 50 to 150 parts by weight of a plastic resin with respect to 100 parts by weight of the pellet to prepare a regenerated fiber,
In the secondary extrusion step,
Wherein the extruded product is extruded at a temperature of 250 to 300 캜, a pressure of 80 to 120 kgf / m ² , and a conveying speed of 50 to 80 rpm. . The method according to claim 1,
Preferably,
Wherein the recycled fiber comprises a low melt polyester fiber. &Lt; RTI ID = 0.0 &gt; 8. &lt; / RTI &gt; The method according to claim 1,
Wherein preparing the first melt comprises:
A first step of raising the temperature from 10 to 50 DEG C to 200 to 300 DEG C;
A second step of raising the temperature from 50 to 100 占 폚 to 200 to 300 占 폚; And
And a third step of raising the temperature from 100 to 150 占 폚 to 200 to 300 占 폚. The method according to claim 1,
Wherein preparing the first melt comprises:
Characterized in that the recycled fiber is carried out in a rotary type reactor having a RPM of 950 to 2000, and a secondary extrusion step. delete The method according to claim 1,
In the secondary extrusion step,
Wherein the extruded product is extruded at a temperature of 270 캜, a pressure of 100 kgf / m ² , and a conveying speed of 62 rpm. delete The method according to claim 1,
The above-
Wherein the thermoplastic resin is at least one selected from the group consisting of polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), ABS (Acrylonitrile, Butadiene, Styrene) and polycarbonate Wherein the recycled fiber is produced by using the waste scrap. delete

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