KR20100087578A - Recycle polyester fiber and the preparing thereof - Google Patents

Abstract

PURPOSE: A recycle polyester fiber and a method of manufacturing thereof are provided to prevent environmental problems by recycling a waste polyester fiber. CONSTITUTION: In a recycle polyester fiber and a method of manufacturing thereof, recycled polyester fiber is collected from a fiber, a film, and a bottle molded article and is melted. A foreign material, a coarse or rough inorganic particle, and a modified resin are filtered. The filtered melt is extruded to be manufactured as a recycled polyester pellet. The recycled polyester pellet is dried and is mixed with general polyester to be processed through a twin-screw extruder.

Description

Recycled polyester fiber and manufacturing method thereof

The present invention relates to a recycled polyester fiber and a method of manufacturing the same, and in particular, it is an environmentally friendly material utilizing a recovered polyester resin recovered from molded products such as fibers, films, bottles, etc., The present invention relates to a regenerated polyester fiber having excellent physical properties such as dyeability even when used as a filament for general clothing, and a method of manufacturing the same.

Starting from polyethylene terephtalate, polyester has excellent mechanical properties, heat resistance, moldability, and chemical resistance, and thus is widely used in the fields of fiber, film, and bottle molded articles. It is used for a purpose. These polyester products are disposed of after disposal, but incineration causes problems such as generation of harmful gases during combustion and damage to the incinerator due to high heat (corrosion). In addition, when the waste is not incinerated, it does not decompose, and thus remains a permanent problem in the soil or in water, and thus serves as a pollutant that causes acidification of the soil.

In addition, there is a demand for recovering and reusing polymer products discarded from the viewpoint of resource recycling, environmental conservation, and the like. Particularly, recycled pellets are made by remelting pellets such as food and beverage bottles (PET bottles), which mainly use polyethylene terephtalate, which is used a lot and is expected to increase. Has been tried for a long time. (Japanese Patent Laid-Open No. Hei 5-279921)

In addition, in the polyester fiber, the fiber is cut to a predetermined size, melted and pelletized, and the fiber is attempted again. However, the recovered fiber products are mixed with polymers of various degrees of polymerization and are subjected to high heat. Due to melt mixing, polyester resins obtained therefrom are yellowed due to thermal decomposition and yellowing due to thermal decomposition and viscosity required for fiberization are not suitable, so they are kneaded with polyester resins prepared by a normal manufacturing method to secure color. In order to reduce the use ratio has been attempted fiberization (Japanese Patent Laid-Open No. 05-148716).

In order to improve the above-mentioned problems, it is also proposed to classify the recovered products (Japanese Patent Laid-Open No. 2000-63557) and to add a fluorescent brightener to the manufacturing process of recycled polyester (Japanese Patent Laid-Open No. 2002-146670). In other words, there is a problem in that it is limited and clothing textiles do not have stable colors.

As a further improved proposal, a method of fibrosis with a poncho structure cross section employing a compound spinning method (Japanese Patent Laid-Open No. 2000-328369) is also carried out, but has a problem that the form (cross section) of the fiber is limited.

Recently, recycled polyesters are polymerized and recycled, and various treatments and reactions are carried out.These are chemical recycles such as terephthalic acid or vis-β-hydroxyethyl terephthalate, which is a raw material of polyester. Although recovery of hydroxy ethyl terephthalate has been proposed, polyesters produced by recovering high-purity raw materials through a conventional polymerization method have excellent physical properties and quality, but have a significant increase in manufacturing cost, resulting in reduced productivity. There is a difficult problem.

Eventually, recycled polyester fiber, which is to be discarded, is recycled polyester fiber that can be used in clothing and the like due to its environmentally friendly properties.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a polyester fiber and a method of manufacturing the recycled polyester waste as a pollution source.

Another object of the present invention is to provide a regenerated polyester fiber and a method for producing the same, even if the polyester to be recycled is kneaded at a high ratio, the dyeing property of the fiber is uniform, that is, the physical properties are the same as those of the non-regenerated polyester.

It is still another object of the present invention to provide a regenerated polyester fiber having a sweat-absorbing quick-drying function and a light-weight insulating property for releasing a cross-section of the regenerated polyester fiber to improve wear comfort in a garment, and a method of manufacturing the same.

In order to achieve the above object, the present invention provides a method for producing recycled polyester fibers, comprising: melting a recovered polyester recovered from a fiber, a film, a bottle molding, or the like; Filtering foreign matter, coarse inorganic particles, modified resin, etc. with the molten filter; Extruding the filtered melt to produce recycled polyester pellets; Drying the regenerated polyester pellets and mixing them with a general polyester to melt kneading in a biaxial extruder; And it provides a method for producing a recycled polyester fiber comprising the step of spinning the melt kneaded material.

In addition, melting the recovered polyester recovered from the fiber, film, bottle molding and the like; Filtering foreign matter, coarse inorganic particles, modified resin, etc. with the molten filter; Extruding the filtered melt to produce recycled polyester pellets; Drying and melting the regenerated polyester pellets; Mixing the molten recycled polyester with a general polyester melt and kneading with a static kneader; And it provides a method for producing a recycled polyester fiber comprising the step of spinning the melt kneaded material.

In addition, the mixing ratio of the recycled polyester and the general polyester provides a method for producing a recycled polyester fiber is 30wt%: 70wt% to 70wt%: 30wt%.

In addition, the filter provides a method for producing regenerated polyester fiber 600 to 2000 mesh (mesh).

In addition, the melt extrusion temperature is in the range of 260 ~ 300 ℃, the melt extrusion time is 10 to 15 minutes to minimize thermal decomposition, and provides a method for producing recycled polyester fiber with a spinning speed of 2500 ~ 5000m / m. .

In addition, the regenerated polyester fiber provides a method for producing a regenerated polyester fiber having a color tone L value of 70 or more and a color tone b value of 7.0 or less.

Further, in the regenerated polyester fiber comprising a recovered polyester and a general polyester recovered from a fiber, a film, a bottle molding, or the like, the regenerated polyester fiber has a color tone L value of 70 or more, It provides a recycled polyester fiber having a b value of 7.0 or less and a general polyester resin and a recycled polyester resin having a mixing ratio of 70 wt%: 30 wt% to 30 wt%: 70 wt%.

The present invention uses a recycled polyester resin that is a quality control suitable for filament company in the management of the raw materials recovered and melted pellets (manufactured by a filament), and the production of a heterogeneous cross section due to nonuniformity such as dyeability It is to provide a suitable fiber for leisure knitted textile products such as sports and mountaineering by adding functionality through solving the difficult part to manufacture a cross section yarn.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms " about ", " substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation to or in the numerical value of the manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

As used herein, the term “fiber” refers to an elongated linear material having a certain degree of strength and flexibility, and means that it is composed of so-called high molecular materials made of small molecules or repetitive filaments, staples, and yarns. It is used to mean all fibers including woven fibers, papermaking, netting, and pulp fibers.

In the recycled polyester fiber according to the preferred embodiment of the present invention, the recovered polyester recovered from a fiber, a film, a bottle molded, or the like is typically a polyester having a double bond, a monomer, or a catalyst. It is used as a coloring component and becomes a coloring component, and undergoes heating and melting process during regeneration. At this time, thermal decomposition and polymerization degree are lowered, and the fiber color tone (b value) tends to increase. There is this.

The fiber color tone is measured using a hunter-type color difference meter, and the indicator of brightness means L value and the yellow indicator means b value. When the L value is large, the brightness is high, and when the b value is large, it means that yellowishness is high.

When the recycled polyester fiber is used for apparel use, the higher the brightness, the lower the yellow taste, the more vivid the dyed color can be used for more applications. The color tone L value of the regenerated polyester fiber is preferably 70 or more, and very preferably 75 or more. The tint b value of the regenerated polyester fiber is preferably 7.0 or less, and most preferably 5.0 or less. When the color tone b value of the regenerated polyester fiber exceeds 7.0, many impurities are present, and yellowness is added, resulting in insufficient dyeing stability. Therefore, the color tone b value of the regenerated polyester fiber should be used within the above range to obtain uniform dyeability and excellent quality as the filament fiber.

In the present invention, in order to ensure the fiber color tone preferably, a resin obtained by improving the whiteness by adding a small amount of fluorescent brightener during polymerization by using a regenerated polyester resin and a high-purity raw material when manufactured by a conventional manufacturing method through a solid phase polymerization method Even if the kneading ratio of the regenerated polyester resin is kneaded higher by increasing the intrinsic viscosity, a fiber having a color tone suitable for the fiber can be produced without a problem in the production of filament.

The kneading ratio of the recycled polyester resin is preferably 30wt% or more, and higher kneading use ratio is important in terms of resource recycling and environmental conservation. More preferably, it is 60 wt% or more. That is, the ratio of general polyester resin and regenerated polyester resin is 70wt%: 30wt%-30wt%: 70wt%.

If less than 30 wt% of recycled polyester resin is used, it does not meet the purpose of recycled products, and in order to increase the proportion of recycled polyester fiber used in the finished product, the proportion of recycled polyester resin is 60wt%. The above is preferable.

Based on the dyeing uniformity, which is a characteristic of the present invention, the problem of limitation in the production of functional material yarns due to defects due to dyeing unevenness in the production of a sectional cross-section yarn is adopted. Uniform kneading enables the fabrication of fibers with uniform dyeing properties.

In general, kneading of resin is pellet and pellet kneading, when manufacturing a conventional polyester filament yarn, an extruder, a process of melting a pellet, has one screw. The melt extrusion method is simply adopted. In this regard, since the intrinsic viscosity of the resin required for fabric production is very high, it is difficult to uniformly disperse kneading in a highly viscous polymer state, and the dyeability difference of the resin appears as a dye unevenness in the fiber length direction.

In the present invention, the use of a two-axis screw extruder for the uniform kneading dispersion enables the production of fibers with uniform dyeing properties by maximizing uniform dispersibility.

In another homogeneous kneading method, each resin may be passed through a separate extruder to obtain a fiber having a uniform dispersion property through a static mixer, which is a liquid kneading apparatus.

In the present invention, a polyester produced by melting the recovered polyester (polyester) is melted using a conventional vent type extruder, and the recovered polyester molding is melted at a melting point above the melting point and uniformly extruded. ) To filter foreign matters, coarse inorganic particles, modified resins, etc., and then extruded and cooled to form a strand to produce pellets.

The filter is preferably 600 to 2000 mesh and more preferably 1000 to 1500 mesh. If the filtration is less than 600 mesh (mesh), fiber manufacturing process operation and manufacturing quality is unstable, and if the above range is exceeded, the replacement cycle of the filter is shortened, it is difficult to work, and economical economic process is difficult to secure.

On the other hand, in order to remove moisture in the obtained regenerated polyester pellets it can be vacuum dried under hot air or reduced pressure. After that, the regenerated pellets are supplied to the metering device according to the pre-designed kneading ratio, and the polyester pellets prepared by polymerization and solid state polymerization with normal high purity raw materials are also dried to remove moisture and then supplied to the metering device. It is melted and extruded in a twin extruder, which is a melt extruder that has a very good homogeneous kneading performance through a storage hopper. Produced by winding through a roller to control the spinning speed by applying a (see Fig. 1).

As needed, it can wind up manufacture through an extending | stretching roll and a heat processing roller through an extending roller.

In general, the melt extrusion temperature is in the range of 260 to 300 ° C., and the melt extrusion time is preferably a direction in which the residence time is reduced as much as possible to minimize thermal decomposition, and more preferably 10 to 15 minutes. Spinning speed is not limited to 2500 ~ 5000m / m range, but can be produced by adjusting according to the type of fiber.

Subsequently, according to the product characteristics, the composite yarn is manufactured by DTY and air entanglement through the process of sand processing. Knit, woven, and dyeing process is performed to manufacture a product fabric suitable for the purpose. .

Meanwhile, FIG. 2 shows another preferred embodiment of the present invention, which is the same as before the step of melt kneading the recycled polyester and the general polyester, but separately melting each of the pellets instead of simultaneously kneading the dried pellets. Thereafter, each of the melts is quantitatively weighed, and a static mixer d, which is a kneading apparatus, is introduced to uniformly disperse and knead the regenerated and general polyester, and then, the spinning polyester fiber having a uniform dyeing property can be produced by spinning. .

In addition, in the spinning step, the cross-section of the regenerated polyester may be released to add or absorb a quick drying function. At this time, the hollow ratio is preferably 10 to 30%. The shape of the release cross section is not limited but may be a release cross section such as a flat arm.

As described above, the recycled polyester fiber and its manufacturing method according to the embodiment of the present invention has an advantage of preventing reuse of resources and environmental pollution by recycling the discarded polyester molding.

In addition, the regenerated polyester fiber according to an embodiment of the present invention and a method for producing the same has a feature of improving the uniformity of dyeing by improving a phenomenon such as dyeing lines due to dyeing unevenness that has been a problem in the conventional regenerated polyester fiber.

In addition, the regenerated polyester fiber according to an embodiment of the present invention and a method for manufacturing the same to solve the part that is not easy to manufacture the release cross-section due to the non-uniformity, such as dyeability, adding the functionality through the production of the release cross-section yarn and hollow fiber activity There is an effect that can provide a suitable fiber for leisure knit products such as sports and mountaineering.

Examples of the method for producing the recycled polyester fiber of the present invention are shown below, but not limited thereto.

Example 1

60 wt% of melted, filtered pelletized polyester resin, 40wt% of solid polymer produced in solid state, and kneaded and quantitatively extruded using a biaxial melt extruder or metering pump. After cooling and solidifying into a mold, winding it at a spinning speed of 3100m / m, and then using DTY 75/36, a cross-section processed yarn through yarn processing, and dyed into a double-sided tissue with a circular knit. Was processed into a brown brown color to produce a product excellent in dyeing uniformity, fabric quality, and sweat absorption quick drying.

Example 2

As in Example 1, recycled polyester filament fibers were manufactured at a blending ratio of 70 wt% recycled polyester and 30 wt% polyester, but each melt extruder and metering pump were manufactured. It is weighed based on the kneading ratio of the furnace and uniformly dispersed in the feed passage with a static mixer, discharged into a hollow section mold (◎), uniformly cooled and solidified to give an emulsion, and then treated at a temperature of 86 ° C. in a stretching roller. Stretched with a heat treatment roller and heat-treated with heat at 120 ° C. to produce filament fibers of 150/72 hollow sections, and then using a circular knitting machine to perform knitting and known dyeing processes to produce polar fleece products. Prepared.

Comparative Example 1

Prepared as in Example 1, the melt extruder was applied to a single-axis extruder (extruder).

Comparative Example 2

Prepared as in Example 2, but prepared without using a static kneader.

The fabrics prepared by the above examples and comparative examples were measured for the values of L and b by the methods of E398-90 and E805-93 of ASTM, and the surface of the processed paper product was composed of expert groups (10 persons). The sensory evaluation was shown in Table 1 below.

division
Manufacture conditions Product Specifications Compounding ratio Melting process
L value
b value
Dyeing uniformity
Regeneration (wt%) Typical (wt%) Example 1 60 40 2-axis melt extrusion 90.7 0.2 ◎ Example 2 70 30 Static kneader 88.6 0.4 ○ Comparative Example 1 60 40 Single Axis Melt Extruder 89.2 2.1 △ Comparative Example 2 70 30 Static kneading
unused 88.4 2.2 x

◎: fairly good

○: good

△: normal

X: not good

As a result of the test, in particular, the product according to Example 2 also had a good brushing workability, which is a manufacturing process of the fleece fabric during dyeing processing, and the soft touch and clean and uniform dyeing (sharpness) of the product were expressed, It was evaluated as a product with bulky and warmth function of the fabric.

Figure 3 is a dyeing picture of the polyester product fabric prepared in Example 2, Figure 4 is a dyeing picture of the polyester product fabric prepared in Comparative Example 1 as shown in the Figure 2 product fabric is a dye uniformity This is good but it can be seen that the dyeing uniformity caused by the dyeing unevenness in the transverse direction in the product fabric of Comparative Example 1 is not good dyeing uniformity.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

1 is a manufacturing process of the recycled polyester according to an embodiment of the present invention.

Figure 2 is a manufacturing process of the recycled polyester according to another preferred embodiment of the present invention.

Figure 3 is a stained picture of the polyester product fabric prepared in Example 2.

Figure 4 is a dyeing photograph of the polyester product fabric prepared in Comparative Example 1.

Claims (7)

In the method for producing recycled polyester fiber, Melting the recovered polyester recovered from the fiber, film, bottle molding, or the like; Filtering foreign matter, coarse inorganic particles, modified resin, etc. with the molten polyester using a filter; Extruding the filtered melt to produce recycled polyester pellets; Drying the regenerated polyester pellets and mixing them with a general polyester to melt kneading in a biaxial extruder; And Method of producing a recycled polyester fiber comprising the step of spinning the melt kneaded material. In the method for producing recycled polyester fiber, Melting the recovered polyester recovered from the fiber, film, bottle molding, or the like; Filtering foreign matter, coarse inorganic particles, modified resin, etc. with the molten polyester using a filter; Extruding the filtered melt to produce recycled polyester pellets; Drying and melting the regenerated polyester pellets; Mixing the molten recycled polyester with a general polyester melt and kneading with a static kneader; And Method of producing a recycled polyester fiber comprising the step of spinning the melt kneaded material. The method according to claim 1 or 2, The mixing ratio of the recycled polyester and the general polyester is 30wt%: 70wt% to 70wt%: 30wt% manufacturing method of the recycled polyester fiber. The method according to claim 1 or 2, The filter is a method for producing recycled polyester fiber 600 to 2000 mesh (mesh). The method according to claim 1 or 2, The melt extrusion temperature is in the range of 260 ~ 300 ℃, melt extrusion time is 10 ~ 15 minutes to minimize thermal decomposition, spinning speed is 2500 ~ 5000m / m method of producing recycled polyester fibers. The method according to claim 1 or 2, The said regenerated polyester fiber is a manufacturing method of the regenerated polyester fiber whose color tone L value is 70 or more, and color tone b value is 7.0 or less. In the regenerated polyester fibers comprising recovered polyester and ordinary polyester recovered from the fibers, films, bottle moldings, etc., The regenerated polyester fiber has a color tone L value of 70 or more, a color tone b value of 7.0 or less, and a mixing ratio of a general polyester resin and a regenerated polyester resin is 30wt%: 70wt% to 70wt%: 30wt%.

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