TWI717721B - Thermal adhesive polyester composition, thermal adhesive polyester complex-fiber comprising the same, and non-woven fabric - Google Patents

Abstract

The present invention relates to a polyester composition for thermobonding fibers, and more specifically, to a product that has excellent fiber spinnability and thermobondability, minimizes aging changes at room temperature, and improves storage stability. A polyester composition for thermal bonding fibers that can exhibit excellent tactility, thermal bonding composite fibers and porous structures realized therefrom.

Description

Polyester composition for thermal bonding fiber, thermal bonding composite fiber and non-woven fabric realized by the polyester composition

The present invention relates to a polyester composition for thermal bonding fibers. More specifically, it has excellent fiber spinnability and thermal bonding in a wide temperature range, and can minimize aging changes under summer storage conditions. The polyester composition for thermo-bonding fiber, the thermo-bonding composite fiber and the non-woven fabric realized by the polyester composition for thermo-bonding fiber, which have improved stability and can exhibit excellent tactile and dyeing properties through the realized product.

Generally, synthetic fibers have a high melting point, so their use is limited in many cases. In particular, when used as a core for bonding applications such as fibers or used as an adhesive for pressure bonding between fabrics inserted into a belt, the fiber fabric itself may be deteriorated by heating, and it is necessary to use such Special equipment such as a high-frequency sewing machine is troublesome. Therefore, it is necessary to easily achieve bonding by a simple heating press without using such special equipment.

When the existing low-melting polyester fiber is used for mattresses, automobile interior materials or various non-woven fabric repairs, etc., in order to bond different types of fibers in the mutual fiber structure used, the hot melt (Hot Melt) type Adhesive fibers are widely used.

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

However, although the existing low-melting polyester fibers as described above can have more than a certain degree of spinnability and adhesiveness, there is a hard feeling after thermal bonding due to the strong ring structure of the modifier. The problem of non-woven fabric or fabric structure.

In addition, with the development of a low melting point or low glass transition temperature in order to exhibit the characteristics of the adhesive, the heat resistance of the achieved polyester deteriorates. Therefore, it also occurs significantly under storage conditions exceeding 40°C in summer. The aging changes, and thus, the storage stability is also significantly deteriorated due to the bonding between polyester chips or fibers during storage.

Therefore, there is an urgent need to develop heat that can maintain or improve the spinnability and adhesion of existing low-melting polyester fibers, have significantly improved touch and dyeing properties, minimize aging changes at room temperature, and improve storage stability. Adhesive polyester fiber.

The present invention was developed in view of the above problems, and its purpose is to provide a product with excellent spinnability, good thermal adhesion, and a product that can exhibit significantly improved tactile and dyeing characteristics, and minimizes aging changes at room temperature. , Polyester composition for thermal bonding fiber with improved storage stability, thermal bonding composite fiber and non-woven fabric realized by it.

In order to achieve the above object, the present invention provides a polyester composition for thermobonding fibers, which is characterized by comprising: an acid component containing terephthalic acid and a compound represented by chemical formula 1 containing ethylene glycol and A copolyester in which the diol component of the compound represented by the chemical formula 2 reacts with an esterified compound and is polycondensed.

According to an embodiment of the present invention, the total content of the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 in the diol component may be 30 to 45 mole percent.

And, in the diol component, the content of the compound represented by Chemical Formula 1 (Mo Ear percentage) may be greater than the content of the compound represented by Chemical Formula 2 (mole percentage).

And, the diol component may not actually include diethylene glycol.

In addition, the acid component may further include 1-10 mole percent isophthalic acid based on the acid component.

And, in the diol component, the content of the compound represented by Chemical Formula 1 may be 1-40 mol%, and the content of the compound represented by Chemical Formula 2 may be 1-20 mol%; more preferably Preferably, the content of the compound represented by chemical formula 1 may be 20-40 mol%, and the content of the compound represented by chemical formula 2 may be 1-10 mol%; more preferably, the content of the compound represented by chemical formula 1 The content of the compound may be 30-40 mole percent, and the content of the compound represented by Chemical Formula 2 may be 1-6 mole percent.

Also, the acid component may further include isophthalic acid, and the total content of the isophthalic acid, the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 in the copolyester may be 55 moles. Ear percentage or smaller.

In addition, the composition has no melting point, exhibits softening behavior, and the glass transition temperature may be 60-75°C; more preferably, it may be 65-72°C.

And, the inherent viscosity of the composition may be 0.500 to 0.800 dl/g.

In addition, the present invention provides a polyester chip characterized by comprising the polyester composition for thermal bonding fibers according to the present invention.

In addition, the present invention provides a thermally bonded composite fiber, which is characterized by comprising: a core portion containing a polyester component; and a sheath portion that surrounds the core portion and includes the polyester composition for thermally bonded fiber according to the present invention Things.

In addition, the present invention provides a non-woven fabric, which is characterized in that it includes the thermally bonded composite fiber according to the present invention alone or includes the thermally bonded composite fiber and the polyester fiber and is formed into a predetermined shape.

According to an embodiment of the present invention, the non-woven fabric may be constituted as one selected from the group consisting of automobile mattress materials, building interior materials, bedding materials, clothing insulation materials, and agricultural insulation materials.

According to the present invention, the fiber has excellent spinnability and good thermal adhesion. The products can show significantly improved tactile and dyeing properties. In addition, the aging change at room temperature is minimized, and storage stability is improved. Furthermore, when the polyester composition is used as a chip, the drying time is significantly reduced, so that the manufacturing time can be shortened. Therefore, products realized by using the composition also minimize aging changes under storage conditions such as summer (for example, 40°C or higher), and have good storage stability, and therefore can prevent deformation or deformation of the initial shape of the product. Deformation during use.

20: Sheath

21: Core

The described and/or other aspects and features of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a cross-sectional view of a composite fiber according to an embodiment of the present invention.

Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art to which the present invention belongs can easily implement the present invention. The present invention can be implemented by a variety of different embodiments and is not limited to the embodiments described in this specification.

The polyester composition for thermo-bonding fibers according to the present invention includes reacting an acid component containing terephthalic acid and a diol component containing ethylene glycol, a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2 The resulting esterified compound polycondensation copolyester.

First, the acid component may include terephthalic acid. In addition to terephthalic acid, it may also include an aromatic polycarboxylic acid having 6 to 14 carbon atoms or an aliphatic polycarboxylic acid having 2 to 14 carbon atoms. Acid and/or sulfonic acid metal salt.

The aromatic polycarboxylic acid having 6 to 14 carbon atoms can be used without restriction A well-known acid component used to prepare polyester; preferably, it may be one or more selected from the group consisting of dimethyl terephthalate, isophthalic acid and dimethyl isophthalate ; More preferably, in terms of reaction stability with terephthalic acid, ease of handling and economy, it can be isophthalic acid.

In addition, the aliphatic polycarboxylic acid having 2 to 14 carbon atoms can be used without limitation, and known acid components used to prepare polyesters. As a non-limiting example, it can be selected from oxalic acid and malonic acid. , Succinic acid, glutaric acid, adipic acid, sorbic acid, citric acid, fenmenic acid, azelaic acid, sebacic acid, pelargonic acid, capric acid, dodecanoic acid and caproic acid More than one kind.

Also, the sulfonic acid metal salt may be sodium 3,5-dicarbomethoxybenzenesulfonate (Sodium 3,5-dicarbomethoxybenzenesulfonate).

On the other hand, as the acid component, other components that may be included in addition to terephthalic acid may reduce the heat resistance of the polyester composition. Therefore, it is preferable not to include other components that may be included in addition to terephthalic acid. ingredient. However, when considering reaction stability with terephthalic acid, ease of handling, and economic aspects, and further including other kinds of acid components, isophthalic acid is preferably included. In this case, preferably, the content of isophthalic acid is 1-10 mole percent based on the acid component. If the content of isophthalic acid is less than 1 mol% based on the acid component, it may be difficult to exhibit high thermal adhesion at the required additional low temperature, and when the content is greater than 10 mol%, the product achieved is excessive The hard and soft touch is significantly reduced, and the glass transition temperature becomes too low, resulting in reduced heat resistance. In addition, the total content of the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 and isophthalic acid in the copolyester, which will be described below, is excessively increased, but instead acts as a main component capable of forming crystals to significantly reduce the It may be difficult to achieve the purpose of the invention due to the thermal bonding characteristics at the required temperature.

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

[Chemical formula 2]

First, the compound represented by the chemical formula 1 can lower the crystallinity and glass transition temperature of the prepared polyester composition to exhibit excellent thermal adhesion properties. In addition, after the fiber is made, the dyeing process can be dyed under normal pressure, which makes the dyeing process easier, and the washing fastness is improved due to the excellent dyeing performance, and the quality of non-woven fabrics can be improved. The touch of the molded product. Preferably, in the diol component, the content of the compound represented by Chemical Formula 1 may be 13-40 mol%; more preferably, it may be 20-40 mol%; even more preferably, it may be It is 30-40 mole percent. If the content of the compound represented by Chemical Formula 1 is less than 13 mol% based on the diol component, although the spinnability is good, the bondable temperature is increased or the thermal bonding characteristics are decreased, and the use application may be limited. Also, if the content of the compound represented by Chemical Formula 1 is greater than 40 mole percent, it is difficult to realize commercialization due to poor spinnability, and on the contrary, the crystallinity increases, resulting in a decrease in thermal adhesiveness.

On the other hand, preferably, the content of the compound represented by Chemical Formula 1 may be equal to or greater than 20 mol%, and thus, together with the compound represented by Chemical Formula 2 which will be described below, the polyester composition can be further improved at low temperature. The heat-adhesive characteristics of the polyester composition, and when the polyester composition is chipped, the drying time can be significantly shortened.

The compound represented by the chemical formula 2 together with the compound represented by the chemical formula 1 further improves the thermal adhesion characteristics of the prepared polyester composition and prevents a significant decrease in the glass transition temperature of the compound represented by the chemical formula 1, Thereby, it is possible to minimize aging changes and improve storage stability even at a storage temperature of 40°C or higher. Regarding the thermal adhesiveness, the compound represented by Chemical Formula 2 and the compound represented by Chemical Formula 1 are mixed and used so that the thermally adhesive fiber realized by the polyester composition exhibits appropriate shrinkage characteristics. By presenting the characteristics as described above, the thermal When bonding, the point bonding force is further improved, so that the thermal bonding characteristics can be further increased.

Preferably, in the diol component, the content of the compound represented by Chemical Formula 2 may be 1-20 mol%; more preferably, it may be 1-10 mol%; even more preferably, it may It is 1~6 mole percentage.

If the content of the compound represented by Chemical Formula 2 is less than 1 mol% based on the diol component, it is difficult to improve the required heat resistance, and thus the storage stability is poor, resulting in excessive changes over time. And when When the compound represented by the chemical formula 2 is greater than 20 mole percent due to use with the compound represented by the chemical formula 1, the spinnability is poor, and therefore it is difficult to realize commercialization. Depending on the situation, if isophthalic acid is further included, The crystallinity is sufficiently reduced without further effect. When the content of further added isophthalic acid is increased, the crystallinity increases instead, resulting in a significant reduction in the excellent thermal adhesion characteristics at the required temperature, etc., and the present invention may not be achieved the goal of. In addition, when it is realized in a fibrous form, shrinkage is significantly increased, and processing is difficult.

According to a preferred embodiment of the present invention, preferably, the total content of the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 is 30-45 mole percent in the glycol component; more preferably , Can be 33~41 mole percentage. If the total content is less than 30 mole percent, the crystallinity of the copolyester increases, showing a high melting point, or it is difficult to realize the softening point to a low temperature, resulting in a significant increase in the heat-bonding temperature, which may not be excellent at low temperatures The thermal bonding characteristics. Also, if the compound represented by Chemical Formula 2 is greater than 45 mol%, the polymerization reactivity and spinnability may be significantly reduced, and the crystallinity of the prepared copolyester will increase instead, so it is difficult to exhibit high thermal adhesion characteristics at the required temperature .

At this time, in the diol component, the content of the compound represented by Chemical Formula 1 may be greater than the content of the compound represented by Chemical Formula 2 (mole percentage). If the content of the compound represented by Chemical Formula 1 is equal to or less than the content of the compound represented by Chemical Formula 2, it is difficult to exhibit the required thermal bonding characteristics, and bonding needs to be performed at a high temperature, so the use of the expanded product will be limited. Also, due to the presence of excessive shrinkage characteristics, it may be difficult to process the product into an expanded product. In addition, there may be a problem that it is difficult to use for the desired purpose.

On the other hand, the diol component may further include another diol component in addition to the compound represented by Chemical Formula 1, the compound represented by Chemical Formula 2, and ethylene glycol.

The other diol component may be a well-known diol component used in the preparation of polyester. There is no particular limitation on this in the present invention. As a non-limiting example, one having 2 to 14 carbon atoms can be exemplified The aliphatic glycol component, specifically, can be selected from 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, propylene glycol, trimethylethylene glycol, tetramethylene Base glycol, pentamethyl glycol, hexamethylene glycol, heptamethylene glycol, octamethylene glycol, non-methylene glycol, decamethylene glycol, undemethylene glycol One or more of the group consisting of dodecanediol and tridecanediol. However, in order to have both the required level of thermal bonding characteristics and heat resistance, it is preferable not to further include the other diol The ingredients, in particular, may actually not include diethylene glycol in the glycol ingredients. When diethylene glycol is included in the diol component, the glass transition temperature is rapidly lowered, and thus, even if the compound represented by Chemical Formula 2 is included, the desired level of heat resistance may not be achieved. At this time, actually not including diethylene glycol in the diol component means that diethylene glycol is not intentionally added when preparing the copolyester, but this does not mean that it is not included in the esterification reaction of the acid component and the diol component. And diethylene glycol which occurs naturally in the polycondensation reaction. On the other hand, 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 relative to the entire composition. If the content of naturally occurring diethylene glycol exceeds an appropriate level, the package pressure will increase during spinning into fibers and cause frequent yarn breakage, thereby significantly reducing spinnability.

The acid component and the diol component may undergo esterification reaction and polycondensation under well-known synthesis conditions in the polyester synthesis field to form a copolyester. At this time, the acid component and the diol component may be charged in a molar ratio of 1:1.1 to 2.0 to cause a reaction, but the present invention is not limited to this.

On the other hand, the acid component and the diol component can be mixed at a time with the appropriate molar ratio as described above, and then undergo an esterification reaction and condensation to prepare a copolyester, or the acid component and the diol component can be combined In the esterification reaction between the diol and the compound represented by Chemical Formula 1, the compound represented by Chemical Formula 2 is added and undergoes the esterification reaction and condensation to form a copolyester, which is not particularly limited in the present invention.

In the esterification reaction, a catalyst may also be included. The catalyst may be a catalyst generally used in the preparation of polyester, and as a non-limiting example thereof, it may be prepared under a metal acetate catalyst.

And, preferably, the esterification reaction is performed at a temperature of 200 to 270° C. and a pressure of 1100 to 1350 Torr. If the above conditions are not satisfied, the esterification reaction time will be prolonged or the reactivity will be reduced, and thus an esterification compound suitable for polycondensation may not be formed.

In addition, the polycondensation reaction can be carried out at a temperature of 250 to 300°C and a pressure of 0.3 to 1.0 Torr. If the conditions are not met, there may be delays in the reaction time, reduction in the degree of polymerization, and pyrolysis. The problem.

At this time, during the polycondensation reaction, a catalyst may also be included. The catalyst may use an antimony compound in order to ensure sufficient reactivity and reduce production costs, or may also use a phosphorus compound or the like to prevent the color change due to pyrolysis at high temperatures.

As the antimony compound, antimony trioxide, antimony tetraoxide, antimony pentoxide can be used Antimony oxides such as antimony trisulfide, antimony trifluoride, antimony trichloride, antimony triacetate, antimony benzoate, antimony tristearate, etc.

Preferably, the amount of the antimony compound used as the catalyst is 100 to 600 ppm based on the total weight of the polymer obtained after polymerization.

As the phosphorus compound, phosphoric acid and derivatives thereof such as phosphoric acid, monomethyl phosphoric acid, trimethyl phosphoric acid, tributyl phosphoric acid, etc. are preferably used. Among them, trimethyl phosphoric acid or triethyl phosphoric acid or triphenyl phosphoric acid is particularly used. Phosphoric acid is preferable because of its excellent effect, and the amount of phosphorus compound used is preferably 100 to 500 ppm based on the total weight of the polymer obtained after polymerization.

The inherent viscosity of the polyester composition according to the present invention prepared by the method may be 0.5 to 0.8 dl/g. If the inherent viscosity is less than 0.5 dl/g, there may be a problem in the formation of a cross section. If the inherent viscosity is greater than 0.8 dl/g, there may be a problem in spinnability due to the high pack pressure.

In addition, the polyester composition has no melting point, and may have thermal characteristics such as showing softening behavior. Preferably, the softening point may be 90 to 110° C., which can help achieve the purpose of the present invention.

In addition, the glass transition temperature of the polyester composition may be 60 to 75°C.

If the glass transition temperature is less than 60℃, the polyester chips, fibers or articles realized by the polyester composition will change greatly under temperature conditions exceeding 40℃ such as summer, and the chips or fibers will Adhesion occurs between them, so the storage stability will be significantly reduced. Moreover, when the chips are bonded, it may cause spinning defects. Furthermore, after being realized as a fiber or the like, the shrinkage characteristic is excessively exhibited, which on the contrary causes the adhesive characteristic to decrease. In addition, due to the limitation of the heat treatment required for the drying process after forming the chips and the post-processing process after spinning into fibers, there may be problems that the time required for the process is extended or the related processes cannot be smoothly performed.

In addition, if the glass transition temperature is greater than 75°C, the thermal bonding characteristics will be significantly reduced, and the execution temperature of the bonding process is limited to high temperatures, so it may be limited in deployment applications.

The polyester composition according to an embodiment of the present invention may be realized as a polyester chip. The manufacturing method of the polyester chip and the specifications of the chip may be in accordance with well-known manufacturing methods and specifications in the technical field, so detailed descriptions thereof will be omitted in the present invention.

And, as shown in FIG. 1, the present invention realizes a thermally bonded composite fiber, the thermally bonded composite fiber includes a core 21 containing polyester components, and surrounds the core 21 and contains the The sheath 20 of the polyester composition for thermal bonding fibers.

The polyester component forming the core may be a well-known polyester having greater heat resistance and mechanical strength than the sheath. As an example, it may be polyethylene terephthalate or polybutylene terephthalate. Glycol ester, polytrimethylene terephthalate, etc., but the present invention is not limited thereto.

As an example, the core and sheath may be composite-spinned at a weight ratio of 8:2 to 2:8, but the present invention is not limited to this, and the ratio can be adjusted appropriately for spinning according to the purpose.

The spinning conditions of the composite fiber, the spinning device, and the process of cooling and drawing the composite fiber after spinning can be performed by well-known conditions, devices, and processes in the technical field, or can be performed by appropriately modifying the known The conditions, devices, and procedures are executed, and therefore, there is no particular limitation on this in the present invention.

As an example, the composite fiber may be spun at a spinning temperature of 270 to 290° C., or it 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, for example, 1 to 100 mm.

On the other hand, the present invention includes non-woven fabrics realized by including thermally bonded composite fibers.

The non-woven fabric may be realized by including the thermally bonded composite fiber alone or the thermally bonded composite fiber and the polyester fiber. Specifically, the thermally bonded composite fiber and the polyester fiber may be short fibers. Each type of staple fiber can be processed into a non-woven fabric by heat treatment after mixing and opening.

According to an embodiment of the present invention, the thermally bonded composite fiber and the polyester fiber may be mixed in a ratio of 3:7 to 1:9, but the present invention is not limited to this, and may be appropriately changed in consideration of usage and the like.

In addition, the heat treatment temperature may be 100 to 180°C, and more preferably, 120 to 180°C, so that the adhesion characteristics can be further improved.

And, as an example, the porous structure may be configured to be selected from the group consisting of mattresses for automobiles, interior materials for buildings, bedding materials, insulation materials for clothes, and insulation materials for agriculture. One of them, but the present invention is not limited to this.

The present invention will be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, but as helping to understand the present invention.

<Example 1>

The chemical formula represented by the following chemical formula 1 was added as a glycol component of 38 mole percent And 3 mole percent of the compound represented by the following chemical formula 2, 59 mole percent of ethylene glycol as the remaining diol component, and 100 mole percent of terephthalic acid as the acid component, and the acid The component and the diol component are esterified at a ratio of 1:1.5 at 250° C. and a pressure of 1140 Torr to obtain an ester reaction product. At this time, the reaction rate is 97.5%. The formed ester reaction product is transferred to a polycondensation reactor, and 300 ppm antimony trioxide as a polycondensation catalyst and 150 ppm phosphoric acid as a heat stabilizer are added to gradually reduce the pressure so that the final pressure becomes 0.5 Torr, and at the same time, increase the temperature To 285°C for polycondensation reaction to obtain a polyester composition for thermal bonding fibers including copolyester, and then the polyester composition is made into a width of 2mm, a length of 4mm, and a height of 3mm by a conventional method Of polyester chips.

Then, in order to produce a core-sheath composite fiber including the polyester composition as the sheath and including polyethylene terephthalate (PET) with an intrinsic viscosity of 0.65dl/g as the core, the polyester The polyester chips and PET chips realized by the composition were put into the hopper, and then melted, and put into the core-sheath spinning nozzle respectively. After that, they were spun at 275°C at a spinning speed of 1000 mpm to make the core and The weight ratio of the sheath is 5:5, and it is stretched 3.0 times to produce the core-sheath type thermally bonded composite fiber shown in Table 1 below with a fiber length of 51 mm and a fineness of 4.0 de.

<Examples 2-14>

Except that the composition ratio of the monomers used to prepare the copolyester was changed as shown in the following Table 1, Table 2 or Table 3, the rest was prepared in the same manner as in Example 1 as shown in the following Table 1, Table 2 or Table 3 Polyester chips and core-sheath composite fibers using them.

<Comparative Examples 1~4>

Except that the composition ratio of the monomers used to prepare the copolyester was changed as shown in Table 2 below, the remaining polyester chips as shown in Table 2 below and the core sheath type composite fiber using the same were produced in the same manner as in Example 1. .

<Experimental example>

The following physical properties of the polyester chips or core-sheath type thermally bonded composite fibers manufactured according to the examples and comparative examples were evaluated, and the results are shown in Table 1 to Table 3 below.

1. Inherent viscosity

Using Ortho-Chloro Phenol as the solvent, the polyester chips were melted at a concentration of 2.0g/25ml at 110°C for 30 minutes, and then kept at 25°C for 30 minutes, and the automatic viscosity connected to the CANON viscometer was used The measuring device performs analysis.

2. Glass transition temperature and melting point

A differential calorimeter was used to determine the glass transition temperature and melting point. As the analysis condition, the temperature increase rate is 20°C/min.

3. Drying time of polyester chips

After the prepared polyester composition was chipped, the moisture content was measured every 4 hours at 55°C in a vacuum dryer. As a result of the measurement, the moisture content was 100 ppm or less. This time was expressed as drying time.

4. Short fiber storage stability

Apply a pressure of 2kgf/cm ² to 500g of the manufactured core-sheath composite fiber in a chamber at a temperature of 40°C and a relative humidity of 45%, and let it stand for 3 days. The fusion between the fibers was observed with naked eyes by 10 experts As a result, the condition was evaluated as 0 to 10 points based on 10 points when no fusion occurred and 0 points when all fibers were fused, and then the average value was calculated. As a result, the case where the average value is 9.0 or more is indicated as very excellent (◎), the case where the average value is 7.0 or more and less than 9.0 is indicated as excellent (○), the average value is 5.0 or more and The case of less than 7.0 is represented as normal (△), and the case of less than 5.0 is represented as poor (×).

5. Spinning operability

As for the spinning operability, for the core-sheath composite fiber spun at the same content according to the respective Examples and Comparative Examples, a drip sensor was used to calculate the drip (which means wear-through) in the spinning process. Some fiber filaments passing through the nozzle are fused or the fiber filaments are irregularly fused to form agglomerates) occurrence value. The dripping occurrence value in Example 1 is taken as the 100% benchmark, and the relative percentage is expressed in the remaining implementation The number of drops that occurred in the example and the comparative example.

6. Dyeing rate evaluation

A dye solution containing 2 weight percent of blue dye based on the weight of the core-sheath composite fiber was dyed at a bath ratio of 1:50 at 90°C for 60 minutes, using the color measurement system of Kurabo Industries Co., Ltd. Measure the spectral reflectance of the dyed composite fiber in the visible light region (360~740nm, at 10nm intervals), and then calculate the total K/S value as an index of the dyeing amount based on the CIE 1976 standard to evaluate the color yield of the dye.

7. Bonding strength

The manufactured core-sheath composite fiber and polyethylene terephthalate (PET) staple fiber (fiber length is 51mm, fineness is 4.0de) are mixed and opened at a ratio of 5:5, and then processed at 120 Heat treatment at temperatures of ℃, 140℃ and 160℃ to achieve a hot-melt non-woven fabric with a basis weight of 35g/m ² and a sample with a width of 100mm, a length of 20mm and a thickness of 10mm, based on KS M The ISO 36 method uses a universal testing machine (UTM) to determine the bonding strength.

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

8. Soft touch

In order to evaluate the bonding strength, a group of 10 experts in the same industry conducted a functional inspection of the non-woven fabric manufactured by heat treatment at a temperature of 140°C. As a result of the evaluation, 8 or more experts judged soft The situation is classified as excellent (◎), the cases judged by 6 to 7 experts as soft are classified as good (○), the cases judged by 4 to 5 experts as soft are classified as normal (△), and the experts judged by less than 4 are soft The situation is divided into poor (×).

It can be seen from Tables 1 to 3 that in the case of the comparative example, it can be confirmed that the drying time is significantly extended (comparative examples 1 to 3), the spinning operability is remarkably poor (comparative example 2, comparative example 3), and short fiber storage stability It becomes very poor (Comparative Example 2, Comparative Example 3), and shape deformation occurs in the adhesion strength evaluation at each temperature (Comparative Example 4), so it can be confirmed that all the physical properties cannot be met at the same time, but the performance of all the examples can be confirmed The physical properties have reached an excellent level.

On the other hand, it can be confirmed that even in the Examples, Example 15 in which the content of the compound represented by Chemical Formula 2 is greater than the content of the compound represented by Chemical Formula 1 is compared with other Examples in the evaluation of the adhesive strength at each temperature The shape is deformed in the medium, so it is not suitable for achieving the required physical properties.

An embodiment of the present invention is described above, but the protection of the present invention is not limited to the embodiments of the present invention. Those skilled in the art can add, modify, delete, add, etc. to the constituent elements within the same protection scope. It is easy to propose other embodiments, and these also belong to the protection scope of the present invention.

20‧‧‧Sheath

21‧‧‧Core

Claims (10)

A polyester composition for thermal bonding fibers, characterized by comprising: an acid component containing terephthalic acid and a glycol containing ethylene glycol, a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2 Copolyester of esterification compound polycondensation formed by reaction of ingredients,

Wherein, the diol component actually does not include diethylene glycol, and the total content of the compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 in the diol component is 30 to 45 mole percent, In the diol component, and the content of the compound represented by Chemical Formula 1 is greater than the content of the compound represented by Chemical Formula 2. The polyester composition for thermal bonding fibers described in the first item of the patent application is characterized in that the acid component further includes 1-10 mole percent isophthalic acid based on the acid component. The polyester composition for thermal bonding fibers described in the first item of the scope of patent application, characterized in that, in the glycol component, the content of the compound represented by the chemical formula 1 is 20-40 mole percent The content of the compound represented by Chemical Formula 2 is 1-10 mole percent. The polyester composition for thermal bonding fibers described in the first item of the scope of patent application is characterized in that it has no melting point, exhibits softening behavior, and has a glass transition temperature of 60 to 75°C. The polyester composition for thermal bonding fibers described in item 3 of the scope of patent application is characterized in that, in the glycol component, the content of the compound represented by the chemical formula 1 is 30-40 mole percent The content of the compound represented by Chemical Formula 2 is 1 to 6 mole percent. The polyester composition for thermal bonding fibers as described in item 1 of the scope of the patent application is characterized in that the inherent viscosity is 0.500 to 0.800 dl/g. A polyester chip, which is characterized by comprising the polyester composition for thermal bonding fibers as described in any one of items 1 to 6 of the scope of patent application. A thermally bonded composite fiber, which is characterized by comprising: a core part comprising a polyester component; and a sheath part surrounding the core part and comprising any one of the first to sixth items in the scope of the patent application Polyester composition for thermal bonding fibers. A non-woven fabric characterized by comprising the thermally bonded composite fiber as described in item 8 of the scope of the patent application and formed into a predetermined shape. The non-woven fabric according to item 9 of the scope of patent application is characterized in that the non-woven fabric is composed of materials selected from automobile mattress materials, building interior materials, bedding materials, clothing insulation materials and agricultural insulation materials. One of the groupings.

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