WO2020231166A1 - Polyester composition for thermally adhesive fiber, thermally adhesive composite fiber implemented therethrough, and nonwoven fabric - Google Patents

Abstract

The present invention relates to a polyester composition for a thermally adhesive fiber, and more specifically, to a polyester composition for a thermally adhesive fiber, a thermally adhesive composite fiber implemented therethrough, and a nonwoven fabric, the polyester composition for a thermally adhesive fiber having excellent fiber spinning properties and thermal adhesion properties, exhibiting minimal aging and improved storage stability at room temperature, enabling excellent texture to be expressed in a product implemented therethrough, and having excellent deodorizing properties and hydrophilic properties.

Description

Polyester composition for heat-adhesive fiber, heat-adhesive composite fiber and non-woven fabric realized through it

The present invention relates to a polyester composition for heat-adhesive fibers, and more particularly, spinning into fibers, excellent heat-adhesion over a wide temperature range, and minimizes change over time even in summer storage conditions, and improves storage stability, It relates to a polyester composition for heat-adhesive fibers capable of expressing excellent touch, deodorant properties, and hygroscopicity in an embodied product, and a heat-adhesive composite fiber and non-woven fabric implemented through it.

In general, synthetic fibers have a high melting point and are often limited in use. In particular, in the case of adhesive use of fibers, etc., in the case of use as an adhesive that is inserted between fabrics on a tape or interposed between fabrics on a tape, the fabric itself may be deteriorated and special equipment such as high-frequency sewing machine must be used. Because of the inconvenience of doing so, it is desired to easily adhere by a common simple heating press without using such special equipment.

Conventional low-melt polyester fibers have been widely used for the purpose of adhering different types of fibers in mutual fiber structures used in manufacturing mattresses, interior materials for automobiles, or various nonwoven fabric patting applications.

For example, U.S. Patent No. 4,129,675 introduces a low-melting-point polyester copolymerized using terephthalic acid (TPA) and isophthalic acid (IPA), and Korean Patent No. 10-1216690 The issue discloses a low melting point polyester fiber including isophthalic acid and diethylene glycol to improve adhesion.

However, the conventional low-melting polyester fiber as described above may have a certain level of spinnability and adhesiveness, but there is a problem of obtaining a rigid nonwoven fabric or a woven structure after heat bonding due to the ring structure of a rigid modifier.

In addition, as development progresses toward a low melting point or low glass transition temperature for the development of binder properties, the heat resistance of the embodied polyester deteriorates, resulting in significant changes with time even under storage conditions exceeding 40℃ in summer. There is a problem in that the storage stability is also markedly deteriorated due to the occurrence of bonding between polyester chips or fibers occurring in the material.

Further, the nonwoven fabric manufactured using conventional low-melting-point polyester fibers has a problem in that it cannot absorb body fluids when used as a sanitary material because the polymer itself has little hydrophilicity.

Therefore, it is possible not only to maintain or improve the spinning property and adhesion of the conventional low-melting-point polyester fiber, but also to minimize change over time at room temperature and improve storage stability with remarkably improved tactile feel and dyeing properties, and hydrophilicity. It is an urgent time to develop a heat-adhesive polyester fiber that can be used for applications requiring hygroscopicity by improving the value.

The present invention has been devised in view of the above points, has excellent spinnability into fibers, exhibits excellent thermal adhesion, and at the same time, can exhibit remarkably improved tactile feel and dyeing properties in applied articles, and furthermore, at room temperature. It is an object of the present invention to provide a polyester composition for heat-adhesive fibers with minimal change over time and improved storage stability, and a heat-adhesive composite fiber and non-woven fabric implemented through it.

In addition, the present invention is a polyester composition for heat-adhesive fibers that can be expanded in applications requiring hygroscopicity by improving deodorization properties and improving hydrophilicity, and heat-adhesive composite fibers and non-woven fabrics implemented through them. It has a different purpose to provide.

In order to solve the above problems, the present invention is a polycondensation of an acid component containing terephthalic acid, and an esterified compound in which ethylene glycol and a diol component including a compound represented by the following formula (1) and a diol component including a compound represented by formula (2) are reacted. It provides a polyester composition for heat-adhesive fibers comprising a copolyester and a deodorant.

[Formula 1]

[Formula 2]

According to an embodiment of the present invention, the total amount of the compound represented by Formula 1 and the compound represented by Formula 2 may be included in 30 to 45 mol% of the diol component.

In addition, the content (mol%) of the compound represented by Formula 1 in the diol component may be greater than the content (mol%) of the compound represented by Formula 2.

In addition, the diol component may not substantially contain diethylene glycol.

In addition, the acidic component may further include isophthalic acid in an amount of 1 to 10 mol% based on the acidic component.

In addition, of the diol component, the compound represented by Formula 1 may be contained in an amount of 1 to 40 mol%, and the compound represented by Formula 2 may be included in an amount of 1 to 20 mol%, and more preferably, the diol component represented by Formula 1 The compound represented is 20 to 40 mol%, the compound represented by Formula 2 is 1 to 10 mol%, more preferably the compound represented by Formula 1 is 30 to 40 mol%, the compound represented by Formula 2 is It may be included in 1 to 6 mol%.

In addition, the acidic component may further include isophthalic acid, and the total amount of the isophthalic acid, the compound represented by Formula 1, and the compound represented by Formula 2 in the copolyester may be included in 55 mol% or less.

In addition, a complementary colorant including blue and red dyes may be further included from 1 to 10 ppm based on the total weight of the polyester composition.

In addition, the deodorant is a photocatalyst oxide doped with a transition metal, and may be provided in an amount of 0.3 to 5.0% by weight based on the total weight of the polyester composition.

In addition, a titanium-based polymerization catalyst based on the total weight of the copolyester may further include 5 to 40 ppmm based on the amount of Ti element.

Based on the total weight of the copolyester, a phosphorus-based thermal stabilizer may be further included in an amount of 10 to 30 ppm based on the amount of P element.

In addition, the composition has no melting point, exhibits a softening behavior, and may have a glass transition temperature of 60 to 75°C, more preferably 65 to 72°C.

In addition, the composition may have an intrinsic viscosity of 0.500 to 0.800 dl/g.

In addition, the present invention provides a polyester chip comprising the polyester composition for heat-adhesive fibers according to the present invention.

In addition, the present invention provides a heat-adhesive composite fiber comprising a core, and a sheath comprising the polyester composition for heat-adhesive fibers according to the present invention surrounding the core.

In addition, the present invention provides a heat-adhesive composite fiber alone or a non-woven fabric molded into a predetermined shape, including the heat-adhesive composite fiber and the polyester fiber according to the present invention.

According to an embodiment of the present invention, the non-woven fabric may be any one selected from the group consisting of various sanitary products, automobile mattresses, interior materials for construction, bedding materials, insulation materials for clothes, and insulation materials for agriculture.

Advantageous Effects of Invention According to the present invention, it is possible to exhibit excellent spinnability to fibers and excellent thermal adhesion, and at the same time, remarkably improved tactile feel and dyeing property in the applied article. In addition, changes over time at room temperature are minimized, and storage stability may be improved. Furthermore, when the polyester composition is manufactured into chips, the drying time can be significantly reduced, and thus the manufacturing time can be significantly shortened. Accordingly, changes over time are also minimized even under storage conditions such as summer (for example, 40°C or higher), and the deformation of the initial shape of the product or deformation during use can be prevented according to the excellent storage stability. In addition, due to its excellent deodorizing properties and hydrophilic properties, it can be widely used in various hygiene products.

1 is a cross-sectional view of a composite fiber according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement the present invention. The present invention may be implemented in various different forms, and is not limited to the embodiments described herein.

In the polyester composition for heat-adhesive fibers according to the present invention, an acid component including terephthalic acid, and an esterified compound in which a diol component including a compound represented by the following Formula 1 and a compound represented by Formula 2 is reacted with ethylene glycol It includes polycondensed copolyester and deodorant.

[Formula 1]

[Formula 2]

First, the acidic component includes terephthalic acid, and in addition to terephthalic acid, an aromatic polyhydric carboxylic acid having 6 to 14 carbon atoms, or an aliphatic polyhydric carboxylic acid having 2 to 14 carbon atoms and/or a metal sulfonic acid metal salt may be further included.

The aromatic polyhydric carboxylic acid having 6 to 14 carbon atoms is an acid component used for the production of polyester, and known ones may be used without limitation, but preferably any selected from the group consisting of dimethyl terephthalate, isophthalic acid and dimethyl isophthalate It may be one or more, and more preferably isophthalic acid in terms of reaction stability with terephthalic acid, ease of handling, and economy.

In addition, aliphatic polyhydric carboxylic acids having 2 to 14 carbon atoms may be used without limitation as known as acidic components used for the production of polyester, but non-limiting examples thereof include oxalic acid, malonic acid, succinic acid, glutaric acid, and It may be any one or more selected from the group consisting of acid, adipic acid, suberic acid, citric acid, pimeric acid, azelaic acid, sebacic acid, nonanoic acid, decanoic acid, dodecanoic acid, and hexanodecanoic acid.

In addition, the sulfonic acid metal salt may be sodium 3,5-dicarbomethoxybenzene sulfonate.

On the other hand, other components that may be provided in addition to terephthalic acid as the acidic component may reduce the heat resistance of the polyester composition, so it is preferable not to include it. However, in consideration of the stability of the reaction with terephthalic acid, ease of handling, and economical aspects, it is recommended to include isophthalic acid when other types of acidic content are further included, and in this case, isophthalic acid is 1 to 10 moles based on the acidic content. It is preferably included in %. If isophthalic acid is provided in an amount of less than 1 mol% based on the acid content, it may be difficult to express high thermal adhesion properties at an additional low temperature for the purpose. If it is provided in excess of 10 mol%, the material to be implemented is hard. The soft touch is significantly lowered, and the glass transition temperature is excessively lowered, resulting in a problem of lowering of heat resistance. In addition, as the total content of the compound represented by Formula 1, the compound represented by Formula 2, and isophthalic acid to be described later in the copolyester increases excessively, it acts as a main component capable of forming crystals at a desired temperature. It may be difficult to achieve the object of the invention, such as significantly lowering the thermal bonding properties.

Next, the diol component includes ethylene glycol, a compound represented by Formula 1 below, and a compound represented by Formula 2.

[Formula 1]

[Formula 2]

First, the compound represented by Formula 1 may lower the crystallinity and glass transition temperature of the polyester composition to be prepared to exhibit excellent thermal bonding performance. In addition, it is possible to dye the dyeing process under normal pressure conditions in the dyeing process after it is manufactured in a fibrous form, thereby facilitating the dyeing process, improving the washing fastness due to excellent dyeing properties, and improving the feel of molded articles such as nonwoven fabrics. Preferably, the compound represented by Formula 1 among the diol components may be included in an amount of 13 to 40 mol%, more preferably 20 to 40 mol%, and even more preferably 30 to 40 mol%. If the compound represented by Chemical Formula 1 is contained in an amount of less than 13 mol% based on the diol component, spinnability is excellent, but there is a concern that the adhesive temperature may be increased or the thermal adhesive property may be reduced, and the intended use may be limited. In addition, if the compound represented by Formula 1 is provided in excess of 40 mol%, there may be a problem that it is difficult to commercialize because of poor radioactivity, and rather, there is a concern that the thermal bonding properties may be deteriorated due to increased crystallinity.

On the other hand, preferably 20 mol% or more of the compound represented by Formula 1 may be provided, through which, together with the compound represented by Formula 2, which will be described later, thermal adhesion properties at low temperatures of the polyester composition may be further improved, There is an advantage that the drying time can be significantly shortened when the polyester composition is chipped.

The compound represented by Chemical Formula 2 further improves the thermal adhesive properties of the polyester composition prepared with the compound represented by Chemical Formula 1 and prevents a significant decrease in the glass transition temperature of the compound represented by Chemical Formula 1 Despite the storage temperature, changes over time can be minimized and storage stability can be improved. Regarding heat adhesion, the compound represented by Formula 2 exhibits appropriate shrinkage properties for heat-adhesive fibers using a polyester composition that is implemented as it is mixed with the compound represented by Formula 1, and due to the development of these properties, By further increasing the point adhesion, it is possible to exhibit more enhanced thermal adhesion properties.

Preferably, of the diol component, the compound represented by Formula 2 may be included in an amount of 1 to 20 mol%, more preferably 1 to 10 mol%, and even more preferably 1 to 6 mol%.

If the compound represented by Formula 2 is contained in an amount of less than 1 mol% based on the diol component, it is difficult to improve the desired heat resistance, so that the storage stability is poor, and there is a concern that the change over time may be very large. In addition, since it is used together with the compound represented by Formula 1, if the compound represented by Formula 2 is contained in an amount exceeding 20 mol%, it may cause problems that are difficult to commercialize due to poor radioactivity, and in some cases, isophthalic acid is additionally included. In the case of the invention, the crystallinity is sufficiently deteriorated and there is no further effect, and when the amount of isophthalic acid to be added increases, the crystallinity is rather increased, so that excellent thermal bonding properties at the desired temperature can be significantly reduced. There is a fear that the purpose will not be achieved. In addition, when implemented in a fibrous form, the shrinkage is remarkably large, and processing is difficult.

According to a preferred embodiment of the present invention, the total amount of the compound represented by Formula 1 and the compound represented by Formula 2 is preferably contained in 30 to 45 mol% of the diol component, more preferably 33 to It may be contained in 41 mol%. If they are contained in less than 30 mol%, the crystallinity of the copolyester increases and a high melting point or softening point becomes difficult to implement at a low temperature, so that the possible thermal bonding temperature is remarkably high, and excellent thermal bonding properties are expressed at low temperatures. May not be. In addition, if the compound represented by Formula 2 is contained in excess of 45 mol%, there is a concern that the polymerization reactivity and radioactivity may be significantly lowered, and the crystallinity of the prepared copolyester is rather increased, resulting in high thermal adhesion at the desired temperature. It can be difficult to express the trait.

In this case, in the diol component, the compound represented by Formula 1 may be included in a larger content (mol%) than the compound represented by Formula 2. If the compound represented by Formula 1 is included in an amount less than or equal to the compound represented by Formula 2, it is difficult to express the desired heat-adhesive properties, and as it must be adhered at a high temperature, the use of the product may be limited. In addition, there is a concern that processing into a developed product may be difficult due to excessive shrinkage characteristics. Furthermore, there may be a problem that it is difficult to use it for a purpose.

Meanwhile, the diol component may further include other types of diol components in addition to the compound represented by Formula 1, the compound represented by Formula 2, and ethylene glycol.

The other type of diol component may be a known diol component used in the production of polyester, so the present invention is not particularly limited thereto, but as a non-limiting example thereof, an aliphatic diol component having 2 to 14 carbon atoms may be used. , Specifically 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, propylene glycol, trimethyl glycol, tetramekylene glycol, pentamethyl glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol , Nonamethylene glycol, decamethylene glycol, undecamethylene glycol, dodecamethylene glycol, and may be any one or more selected from the group consisting of tridecamethylene glycol. However, in order to combine heat resistance at the same time as the desired level of thermal adhesive properties, it is preferable not to further contain other types of diol components other than the compound represented by Formula 1, the compound represented by Formula 2, and ethylene glycol. In particular, diethylene Glycol may be substantially free from the diol component used to obtain the copolyester. If diethylene glycol is included in the diol component, it may cause a rapid decrease in the glass transition temperature, so that even when the compound represented by Formula 2 is provided, the desired level of heat resistance may not be achieved. At this time, the meaning that diethylene glycol is not substantially contained in or does not contain diethylene glycol means that diethylene glycol is not intentionally added when preparing the copolyester, and the esterification reaction of the acidic component and the diol component However, it does not mean that it does not contain diethylene glycol that occurs naturally in the poly/condensation reaction. Meanwhile, according to an embodiment of the present invention, the content of naturally occurring diethylene glycol included in the polyester composition may be less than 3% by weight of the total composition. If the naturally occurring content of diethylene glycol exceeds an appropriate level, there is a problem in that the pack pressure is increased when spinning into fibers, and the spinning property may be significantly reduced by causing frequent trimming.

The above-described acidic component and diol component can be prepared into copolyester through esterification and polycondensation using known synthetic conditions in the polyester synthesis field. At this time, the acid component and the diol component may be added to react at a molar ratio of 1: 1.1 to 2.0, but is not limited thereto.

On the other hand, the acid component and the diol component are mixed at one time in an appropriate molar ratio as described above, and then esterified and polycondensed to form a copolyester, or between ethylene glycol and a compound represented by Formula 1 among the acid component and diol component. During the esterification reaction, the compound represented by Formula 2 may be added to form a copolyester through esterification and polycondensation, and the present invention is not particularly limited thereto.

In the esterification reaction, a catalyst may be further included. The catalyst may be a catalyst typically used in the production of polyester, but preferably may be a titanium-based polymerization catalyst, and more specifically, may be a titanium-based polymerization catalyst represented by the following formula (3).

[Formula 3]

Since the titanium-based polymerization catalyst represented by Chemical Formula 3 is stable even in the presence of water molecules, it is not deactivated even if it is added before the esterification reaction in which a large amount of water is produced.Therefore, the esterification reaction and polycondensation within a shorter time than the conventional one The reaction may proceed, and coloration due to yellowing may be suppressed through this. The catalyst may be included so as to be 5 to 40 ppm in terms of titanium atoms in the total weight of the obtained copolyester, through which the thermal stability or color tone of the copolyester is better, and thus it is preferable. If it is provided with less than 5 ppm in terms of titanium atoms, it may be difficult to adequately promote the esterification reaction, and if it is provided in excess of 40 ppm, reactivity may be promoted, but there may be a problem in that coloring occurs.

In addition, the esterification reaction may be preferably carried out under a temperature of 200 to 270 °C and a pressure of 1100 to 1350 Torr. If the above conditions are not satisfied, there may be a problem in that an esterification reaction time is prolonged or an esterification compound suitable for polycondensation reaction cannot be formed due to a decrease in reactivity.

In addition, the polycondensation reaction may be performed under a temperature of 250 to 300°C and a pressure of 0.3 to 1.0 Torr, and if the above conditions are not satisfied, there may be problems such as delay in reaction time, decrease in polymerization degree, and induce thermal decomposition. .

On the other hand, the polycondensation reaction may further include a thermal stabilizer. The thermal stabilizer is for preventing discoloration of color through thermal decomposition at high temperature, and a phosphorus compound may be used. As the phosphorus-based compound, phosphoric acid, such as phosphoric acid, monomethyl phosphoric acid, trimethyl phosphoric acid, and triethyl phosphoric acid, and derivatives thereof are preferably used, and among them, trimethyl phosphoric acid or triethyl phosphoric acid is particularly preferable because of its excellent effect. The amount of the phosphorus-based compound is preferably 10 to 30 ppm in terms of phosphorus atoms based on the total weight of the final copolyester. If the phosphorus-based thermal stabilizer is used in less than 10 ppm, it is difficult to prevent high-temperature thermal decomposition and the copolyester may be discolored. If it exceeds 30 ppm, it may be disadvantageous in terms of manufacturing cost. In the case of polycondensation reaction, the thermal stabilizer inhibits catalytic activity. There may be a problem in that the reaction delay phenomenon occurs.

The heat-adhesive polyester composition according to the present invention includes a deodorant provided during the polycondensation reaction of the above-described copolyester or after obtaining the copolyester. The deodorant performs a function of decomposing and reducing or removing harmful gases such as VOC substances such as formaldehyde, ammonia, and trimethylamine, and known deodorants used for textiles can be used without limitation. However, in order to improve the hydrophilicity of the fiber and to be activated more easily, it may be preferably a matte catalyst, and specifically, may be a photocatalyst oxide doped with a transition metal. A matte catalyst refers to a catalyst that can act as a catalyst through absorption of moisture even in the absence of light. The transition metal is not particularly limited, but in consideration of reactivity, two or more types selected from the group consisting of Zn, Mn, Fe, Cu, Ni, Co, Cr, V, Zr, Mo, Ag, W, Pt, and Au are used. It is desirable. In addition, the photocatalyst oxide may include TiO ₂ , SrTiO ₃ , ZrO, SnO ₂ , WO ₃ , Bi ₂ O ₃ , Fe ₂ O _3, etc., but TiO ₂ is particularly preferable and contains anatase type TiO ₂ It is preferable to do, and even more preferably, the anatase type TiO ₂ photocatalyst oxide may be doped with transition metals Fe and Ag.

The deodorant may be provided in an amount of 0.3 to 5.0% by weight, more preferably 0.3 to 2.5% by weight, and even more preferably 0.3 to 1.2% by weight based on the total weight of the heat-adhesive polyester composition. If it is provided in less than 0.3% by weight, it may be difficult to increase the desired level of deodorizing properties and hydrophilicity, and if it exceeds 5.0% by weight, the single yarn strength is lowered, and spinning workability due to yarn breakage may be deteriorated. In addition, even if the yarn is spun without being trimmed, not only harmful gases but also the fiber-forming component copolyester are affected by the catalytic reaction of moisture or exposed light during storage or after use as a product, for example, a matte catalyst activated by ultraviolet rays. There is a concern that the strength of the yarn may be further markedly lowered.

In addition, the heat-adhesive polyester composition may further include a complementary colorant. The complementary colorant is for color tone adjustment to make the color of the dye dyed stronger and better in the dyeing process that proceeds after being spun into the fiber, and a known one in the textile field may be added, as a non-limiting example. Wear dyes, pigments, vat dyes, disperse dyes, organic pigments, etc. However, preferably, a mixture of blue and red dyes may be used. This is because cobalt compounds, which are generally used as complementary colors, are not preferable because they are harmful to the human body, whereas complementary colors mixed with blue and red dyes are preferable because they are harmless to the human body. In addition, when a mixture of blue and red dyes is used, there is an advantage in that the color tone can be finely controlled. Examples of the blue dye may include solvent blue 104, solvent blue 122, and solvent blue 45, and examples of the red dye may include solvent red 111, solvent red 179, and solvent red 195. In addition, the blue dye and the red dye may be mixed in a weight ratio of 1: 1.0 to 3.0, which is advantageous in expressing a remarkable effect on a desired fine color tone control.

The complementary colorant may be provided with 1 to 10 ppm based on the total weight of the polyester composition.If it is provided with less than 1 ppm, it may be difficult to achieve the desired level of complementary color characteristics, and if it exceeds 10 ppm, the L value is reduced. Therefore, there may be a problem in that transparency is deteriorated and a dark color appears.

The polyester composition according to the present invention prepared through the above-described method may have an intrinsic viscosity of 0.5 to 0.8 dl/g. If the intrinsic viscosity is less than 0.5 dl/g, there may be a problem in cross-section formation, and if the intrinsic viscosity is more than 0.8 dl/g, there may be a problem in radioactivity due to high pack pressure.

In addition, the polyester composition may have no melting point, may have thermal properties showing a softening behavior, and preferably may have a softening point of 90 to 110°C, which may be more advantageous in achieving the object of the present invention.

In addition, the polyester composition may have a glass transition temperature of 60 to 75°C. If the glass transition temperature is less than 60℃, the polyester chips, fibers, or articles implemented through the polyester composition change with time even at temperatures exceeding 40℃, such as in summer. There is a fear that bonding occurs and storage stability is significantly lowered. In addition, there is a concern that radiation failure may occur when inter-chip bonding occurs. Furthermore, there is a concern that the shrinkage property is excessively expressed after being implemented with fibers, etc., and the bonding property is rather deteriorated. In addition, due to the limitation of heat treatment required for a drying process after chip formation or a post-processing process after spinning into fibers, there may be a problem in that the time required for the process is prolonged or the process cannot be smoothly performed.

In addition, if the glass transition temperature exceeds 75°C, there is a concern that the thermal bonding characteristics may be significantly deteriorated, and there is a concern that the development of the use may be limited as the performing temperature of the bonding process is limited to high temperatures.

The polyester composition according to an embodiment of the present invention described above may be implemented as a polyester chip, and the method of manufacturing the polyester chip and the specification of the chip may follow the manufacturing method and specification known in the art. In the present invention, detailed descriptions thereof will be omitted.

In addition, the present invention is a thermal bonding including a core portion 11, and a sheath 12 including the polyester composition for heat-adhesive fibers according to the present invention surrounding the core portion 11 as shown in FIG. Implement the castle composite fiber (10).

The core portion may be used without limitation in the case of a polymer capable of spinning as a fiber, and for example, may be a known polyester-based component having high heat resistance and mechanical strength compared to the sheath, specifically polyethylene terephthalate, polybutylene terephthalate, Polypropylene terephthalate may be used, but is not limited thereto.

The core portion and the sheath portion may be, for example, a composite spun in a weight ratio of 8:2 to 2:8, but is not limited thereto, and may be spun by appropriately adjusting the ratio according to the purpose.

The process of spinning the composite fiber, the spinning device, and the cooling, stretching, etc. of the composite fiber after spinning can be performed through known conditions, devices, and processes in the art, or by appropriately modifying it. It does not specifically limit.

As an example, the composite fiber may be spun at a spinning temperature of 270 to 290°C, and may be stretched 2.5 to 4.0 times after spinning. In addition, the fineness of the composite fiber may be 1 to 15 denier, and the fiber length may be 1 to 100 mm, for example.

On the other hand, it turns out that the heat-adhesive polyester composition according to an embodiment of the present invention may be spun alone unlike FIG. 1 to be implemented as a single heat-adhesive fiber.

In addition, the present invention includes a nonwoven fabric implemented including the above-described heat-adhesive composite fiber or heat-adhesive single fiber.

The nonwoven fabric may be implemented by mixing a heat-adhesive fiber alone, such as a heat-adhesive composite fiber or a heat-adhesive single fiber, or a polyester-based fiber as a support fiber with the heat-adhesive fiber. For example, the heat-adhesive fiber and the polyester fiber may be short fibers, and each of the short fibers may be honed and opened, and then heat treated to produce a nonwoven fabric.

According to an embodiment of the present invention, the heat-adhesive fiber and the polyester fiber may be mixed in a ratio of 3:7 to 1:9, but are not limited thereto and may be appropriately changed in consideration of use.

In addition, the heat treatment may be 100 to 180 °C, more preferably 120 to 180 °C, through which more improved adhesive properties may be expressed.

In addition, the porous structure may be any one selected from the group consisting of various hygiene products, automobile mattresses, interior materials for construction, bedding materials, insulation materials for clothes, and insulation materials for agriculture, but is not limited thereto.

The present invention will be described in more detail through the following examples, but the following examples do not limit the scope of the present invention, which should be interpreted to aid understanding of the present invention.

<Example 1>

38 mol% of a compound represented by the following formula (1) as a diol component, 3 mol% of a compound represented by the following formula (2), and 59 mol% of ethylene glycol are added as the remaining diol component, and 100 mol% of terephthalic acid is added as an acidic component. The component and the diol component were esterified at 250° C. in a ratio of 1:1.5 under 1140 torr pressure to obtain an ester reaction product, and the reaction rate was 97.5%. The formed ester reaction product was transferred to a polycondensation reactor, and based on the total weight of the copolyester to be obtained, 15 ppm of a titanium-based compound represented by the following formula (3) (based on Ti element) as a polycondensation catalyst, and 25 ppm of triethyl phosphate as a heat stabilizer (P Elemental) and gradually reduced to a final pressure of 0.5 torr, and heated up to 285°C to perform a polycondensation reaction to form a copolyester, and anatase-type TiO ₂ doped with transition metals Fe and Ag. A polyester composition for heat-adhesive fibers was obtained by including 1% by weight based on the total weight of the polyester composition to prepare the photocatalyst oxide.

Thereafter, the polyester composition was prepared as a polyester chip having a width, length, and height of 2mm×4mm×3mm, respectively, by a conventional method.

Thereafter, in order to manufacture a core-sheath type composite fiber having the polyester composition as a sheath and a polyethylene retephthalate (PET) having an intrinsic viscosity of 0.65 dl/g as a core part, a polyester chip made of the polyester composition, and PET After each inserting the chips into the hopper, they were melted and put into a core sheath type spinneret, and then combined spinning at a spinning speed of 1000mpm at 275℃ so that the core and the sheath had a weight ratio of 5:5, and the fiber length was 51mm by stretching 3.0 times. A core sheath type heat-adhesive composite fiber as shown in Table 1 with a fineness of 4.0de was prepared.

[Formula 1]

[Formula 2]

[Formula 3]

<Examples 2 to 14>

Prepared by carrying out the same manner as in Example 1, but by changing the composition ratio of the monomer for the production of copolyester as shown in Table 1, Table 2 or Table 3 below, a polyester chip as shown in Table 1, Table 2, or Table 3, and A core sheath type composite fiber was prepared using this.

<Comparative Examples 1 to 4>

It was prepared in the same manner as in Example 1, but by changing the composition of the monomer for preparing the copolyester as shown in Table 2 below, a polyester chip as shown in Table 2 and a core sheath type composite fiber using the same were prepared.

<Experimental Example 1>

The following physical properties were evaluated for polyester chips or core-sheath heat-adhesive composite fibers prepared according to Examples and Comparative Examples, and the results are shown in Tables 1 to 3 below.

1. Intrinsic viscosity

For polyester chips, ortho-chlorophenol (Ortho-Chloro Phenol) is used as a solvent and melted for 30 minutes at a concentration of 110℃, 2.0g/25ml, and then incubated at 25℃ for 30 minutes, automatically connected with a CANON viscometer. It was analyzed from a viscosity measuring device.

2. Glass transition temperature, melting point

The glass transition temperature and melting point were measured using a differential calorimeter, and the analysis condition was a temperature increase rate of 20°C/min.

3. Polyester chip drying time

After the polyester composition was chipped, the moisture content was measured in a vacuum dryer at 55° C. at 4 hour intervals, and the time was expressed as drying time when the moisture content was 100 ppm or less as a result of the measurement.

4. Short fiber storage stability

For 500 g of the manufactured core sheath type composite fiber, 10 experts observed the state of fusion between the fibers with the naked eye by applying a pressure of 2 kgf/㎠ in a chamber at a temperature of 40°C and a relative humidity of 45% for 3 days. The case was evaluated as 0 to 10 points based on 10 points and 0 points for all cases of fusion, and then the average value was calculated. As a result, when the average value was 9.0 or more, it was very good (◎), when it was 7.0 or more and less than 9.0, it was excellent (○), 5.0 or more and less than 7.0 were indicated as normal (△), and less than 5.0 was indicated as bad (X).

5. Spinning workability

Spinning workability occurs during spinning process for core sheath type composite fibers spun in the same amount for each Example and Comparative Example (means a lump formed by fusion of some of the fiber strands passing through the detention or irregular fusion of strands after trimming) Numerical values were counted through a drip detector, and the number of drips generated in the remaining Examples and Comparative Examples was expressed as a relative percentage based on the number of drip occurrences in Example 1 as 100.

6. Evaluation of dyeing rate

After performing a dyeing process at 90° C. for 60 minutes at a bath ratio of 1:50 for a dye solution containing 2% by weight of blue dye based on the weight of the core sheath type composite fiber, Japan's KURABO After measuring the spectral reflectance of the visible region (360 ~ 740nm, 10nm interval) of the dyed composite fiber using the company's color measurement system, the Total K/S value, an index of the amount of dyeing according to the CIE 1976 standard, was calculated. The color yield of the dye was evaluated.

7. Adhesive strength

After blending and opening the core sheath type composite fiber and polyethylene terephthalate (PET) short fiber (fiber length 51㎜, fineness 4.0de) to 5: 5, 120℃, 140℃? And a hot melt nonwoven fabric having a basis weight of 35g/m2 by heat treatment at a temperature of 160°C, and implemented as a specimen with a width, length and thickness of 100mmХ20mmХ10mm, respectively, using a universal testing machine (UTM) based on the KS M ISO 36 method. The adhesive strength was measured.

On the other hand, when the shape was deformed due to excessive shrinkage during heat treatment, the adhesive strength was not evaluated but evaluated as'shape deformation'.

8. Soft touch

For the evaluation of the adhesive strength, a sensory test by a group of 10 experts in the same industry was conducted on the nonwoven fabric manufactured by heat treatment at a temperature of 140℃, and the evaluation result is excellent (◎) if more than 8 people are judged to be soft. , 6 to 7 were classified as good (○), 5 to 4 were normal (△), and less than 4 were classified as bad (×).

As can be seen through Tables 1 to 3,

In Comparative Examples, the drying time was remarkably extended (Comparative Examples 1 to 3), spinning workability was remarkably poor (Comparative Example 2, Comparative Example 3), or short fiber storage stability was very poor (Comparative Examples 2 and 3). ), it can be confirmed that the shape is deformed (Comparative Example 4) in the evaluation of the adhesive strength by temperature, so it can be confirmed that all physical properties cannot be satisfied at the same time, but it can be seen that the examples express all physical properties at an excellent level. .

On the other hand, in Example 15, in which the content of the compound represented by Formula 2 was higher than that of the compound represented by Formula 1, the shape was changed in the adhesive strength evaluation by temperature compared to other examples to achieve the desired physical properties. It can be confirmed that it is not suitable for.

<Examples 15 to 18>

It was prepared in the same manner as in Example 1, but the content of the deodorant was changed as shown in Table 4 to prepare a core sheath type composite fiber.

<Comparative Example 5>

Manufacturing was carried out in the same manner as in Example 1, but without adding a deodorant, a core sheath type composite fiber as shown in Table 4 was prepared.

<Experimental Example 2>

The following physical properties were evaluated using the core sheath type composite fibers according to Examples 1, 15 to 18, Comparative Examples 1 and 5, and the results are shown in Table 4.

1. Spinning workability

Spinning workability was evaluated in the same manner as in Experimental Example 1.

2. Storage stability against moisture and light

The core sheath type composite fiber was heat-treated at 130°C to prepare a nonwoven fabric. The prepared nonwoven fabric was cut into a predetermined size, and two specimens were prepared for each Example and Comparative Example, and then one prepared specimen (Sample 1) in a constant temperature and humidity chamber equipped with a UV lamp prepared in advance was added, and a temperature of 25°C, Relative humidity of 50%RH and ultraviolet rays were irradiated for 30 days at an intensity of 300mJ/cm2. The storage stability against moisture and light is determined by measuring the tensile strength of the specimen stored for 30 days in the constant temperature and humidity chamber and the tensile strength of the remaining specimens (specimen 2, untreated specimen) that were not put into the constant temperature and humidity chamber, respectively. It was derived, and it can be evaluated that the higher the value, the greater the decrease in mechanical strength caused by external moisture or light such as ultraviolet rays. At this time, the tensile strength of the specimen 2 was measured at the point of starting the evaluation by putting the specimen 1 into a constant temperature and humidity chamber.

[expression]

Mechanical strength reduction rate (%) = [(Tensile strength of specimen 2 (N)-Tensile strength of specimen 1 (N))/Tensile strength of specimen 2 (N)] ×100

3. Gas reduction rate

The core-sheath type composite fiber was heat-treated at 130°C to prepare a nonwoven fabric, and then cut into 10cm×10cm to prepare a specimen. The prepared specimen was put in a 3L Tedler bag and sealed by injecting the target gas and clean air, and after 120 minutes, the respective concentrations were measured by the gastec detection tube method, and the gas reduction rate was calculated from the following calculation formula 1.

[Calculation 1]

Reduction rate (%) = [(C _b -C _a )/C _b ]× 100

At this time, in the above formula 1, C _b represents a blank test concentration, and C _a represents a sample concentration.

4. Absorbency

Absorption was performed using the Virec method, and after making a specimen obtained by cutting the prepared nonwoven fabric into 2.5cm × 20cm to evaluate the gas reduction rate, the lower part was immersed in a water bath, and the height absorbed by the specimen by capillary phenomenon was measured for 10 minutes. I did.

As can be seen by referring to Table 4,

It can be seen that the examples including the deodorant are advantageous in simultaneously satisfying the gas reduction rate, spinning workability, hydrophilicity, and storage stability due to light/moisture compared to Comparative Example 5.

In addition, in the case of Comparative Example 1 that does not contain the compound of Formula 2, even when the deodorant is included, it is not good in absorbency, spinning workability, and storage stability due to light/moisture compared to Example 1 including the deodorant in the same amount. I can confirm.

Although an embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiment presented in the present specification, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same idea. It will be possible to easily propose other embodiments by changing, deleting, adding, etc., but it will be said that this is also within the scope of the present invention.

Claims (13)

1. Heat containing a copolyester and a deodorant in which an acidic component containing terephthalic acid, and an esterified compound in which ethylene glycol and a diol component including a compound represented by the following formula (1) and a diol component (2) are reacted are polycondensed and a deodorant Polyester composition for adhesive fibers.

   [Formula 1]

   

   [Formula 2]

   
2. The method of claim 1,

   The diol component is a polyester composition for heat-adhesive fibers, characterized in that it does not contain diethylene glycol.
3. The method of claim 1,

   The total content of the compound represented by Formula 1 and the compound represented by Formula 2 is a polyester composition for heat-adhesive fibers, characterized in that contained in 30 to 45 mol% of the diol component.
4. The method of claim 1,

   The acid component is a polyester composition for heat-adhesive fibers, characterized in that it further comprises 1 to 10 mol% of isophthalic acid based on the acid component.
5. The method of claim 1,

   A polyester composition for heat-adhesive fibers further comprising 1 to 10 ppm of a complementary colorant including blue and red dyes based on the total weight of the polyester composition.
6. The method of claim 1,

   Among the diol components, the compound represented by Formula 1 is contained in an amount of 20 to 40 mol% based on the diol component, and the compound represented by the formula 2 is contained in an amount of 1 to 10 mol% based on the diol component. Polyester composition for sex fibers.
7. The method of claim 1,

   The deodorant is a photocatalyst oxide doped with a transition metal, and is provided in an amount of 0.3 to 5.0% by weight based on the total weight of the polyester composition.
8. The method of claim 1,

   A polyester composition for heat-adhesive fibers, characterized in that the titanium-based polymerization catalyst further comprises 5 to 40 ppmm based on the amount of Ti element based on the total weight of the copolyester.
9. The method of claim 1,

   A polyester composition for heat-adhesive fibers, characterized in that the phosphorus-based thermal stabilizer further comprises 10 to 30 ppm based on the amount of P element based on the total weight of the copolyester.
10. The method of claim 1,

    There is no melting point, exhibits a softening behavior, and a heat-adhesive fiber polyester composition, characterized in that the glass transition temperature is 60 ~ 75 ℃.
11. Polyester chip comprising the polyester composition for heat-adhesive fibers according to claim 1.
12. Deep; And

    A heat-adhesive composite fiber comprising; a sheath comprising the polyester composition for heat-adhesive fibers according to claim 1 surrounding the core.
13. A nonwoven fabric formed into a predetermined shape, including the heat-adhesive composite fiber according to claim 12.

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