JP2022033806A - Polyester composition for thermally adhesive fiber, thermally adhesive composite fiber implemented using the same, and nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a polyester composition for a thermally adhesive fiber, more specifically, a polyester composition for a thermally adhesive fiber that has an excellent spinning property and excellent thermal adhesion with respect to a fiber, that minimizes aging and improves a store stability at room temperature, and can have an excellent feel when implemented in a product, and that has an excellent deodorizing property and hydrophilic property; a thermally adhesive composite fiber implemented using the same; and a nonwoven fabric.

SOLUTION: There is provided a polyester composition for a thermally adhesive fiber, which comprises: an acid component including terephthalic acid; a co-polyester in which polycondensation of an esterified compound obtained by reacting ethylene glycol and a specific diol component is performed; and a deodorant.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

Detailed description of the invention

[Technical field]
The present invention relates to a polyester composition for heat-adhesive fibers, more specifically, excellent in spinnability to fibers, heat-adhesiveness in a wide temperature range, minimal change over time even under storage conditions in summer, and storage stability. The present invention relates to a polyester composition for a heat-adhesive fiber capable of exhibiting excellent tactile sensation, deodorizing properties and hygroscopicity in the embodied product, and the heat-adhesive composite fiber and the non-woven fabric embodied therein.
[Background technology]

In general, synthetic fibers have a high melting point, which often limits their use. In particular, when it is used as an adhesive for bonding fibers, etc., such as a core, or as an adhesive that is inserted between tape-shaped fabrics and pressure-bonded, the fiber fabric itself may deteriorate due to heating, and a high-frequency sewing machine Since there is the trouble of having to use special equipment such as, there is a demand for easy bonding by a normal simple heating press without using such special equipment.

Conventional low melting point polyester fibers are widely used as hot melt type binder fibers for the purpose of adhering different kinds of fibers in a mutual fiber structure used at the time of manufacturing for putting of mattresses, built-in materials for automobiles or various non-woven fabrics. Has been used.

For example, US Registered Patent No. 4,129,675 introduces a low melting point polyester copolymerized using terephthalic acid (TPA) and isophthalic acid (IPA). , Korea Registered Patent No. 10-1216690 discloses a low melting point polyester fiber embodied containing isophthalic acid and diethylene glycol for improving adhesiveness.

However, the conventional low melting point polyester fiber as described above can have a certain level of spinnability and adhesiveness, but has a non-woven fabric or woven structure that feels hard after thermal bonding due to the ring structure of the rigid modifier. There is a problem of getting a body.

In addition, due to the development of a low melting point and a low glass transition temperature due to the development of binder properties, the heat resistance of the embodied polyester deteriorates, and even under storage conditions exceeding 40 ° C in summer. There is a problem that the change with time is remarkably generated, polyester chips and interfiber bonds generated during storage are generated, and the storage stability is remarkably lowered.

As a result, the non-woven fabric produced by using the conventional low melting point polyester fiber has a problem that it does not absorb body fluid when it is used as a sanitary material because the polymer itself has almost no hydrophilicity.

Therefore, it is possible to maintain or improve the spinnability and adhesiveness of conventional low melting point polyester fibers, and at the same time, with significantly improved tactile sensation and dyeing characteristics, the change with time at room temperature is minimized and storage stability is improved. At present, there is a demand for the development of heat-adhesive polyester fibers that can be improved and that can be used in applications that require improved hydrophilicity and hygroscopicity.
[Outline of the invention]
[Problems to be solved by the invention]

The present invention has been made in view of the above points, and an object thereof is excellent in spinnability to fibers, excellent thermal adhesion is exhibited, and at the same time, it is remarkably improved in an applied article. Polyester compositions for heat-adhesive fibers that are capable of exhibiting tactile sensation and dyeing properties, with minimal change over time at room temperature and improved storage stability, and the heat-adhesive composite fibers embodied through them. The purpose is to provide non-woven fabrics.

Another object of the present invention is a polyester composition for heat-adhesive fibers, which can be expanded to applications where deodorizing properties are improved, hydrophilicity is improved, and hygroscopicity is required. The present invention is to provide a heat-adhesive composite fiber and a non-woven fabric.
[Means to solve problems]

In order to solve the above-mentioned problems, the present invention presents an esterified compound in which an acid component containing terephthalic acid and a diol component containing ethylene glycol and a compound represented by the following chemical formula 1 and a compound represented by the chemical formula 2 are reacted. Provided is a polyester composition for heat-adhesive fibers, which comprises polycondensed copolyester and a deodorant.

According to the embodiment of the present invention, the total content of the compound represented by the chemical formula 1 and the compound represented by the chemical formula 2 can be contained in the diol component in an amount of 30 to 45 mol%.

Further, the content (mol%) of the compound represented by the chemical formula 1 in the diol component may be further larger than the content (mol%) of the compound represented by the chemical formula 2.

Further, the diol component may be substantially free of diethylene glycol.

Further, the acid component may further contain isophthalic acid in an amount of 1 to 10 mol% based on the acid component.

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

Further, the acid component further contains isophthalic acid, and the total content of the isophthalic acid, the compound represented by the chemical formula 1 and the compound represented by the chemical formula 2 in the copolyester is 55 mol% or less. Can be included.

Also, complementary colors containing blue and red dyes can be further included at 1-10 ppm based on the total weight of the polyester composition.

Further, the deodorant is a photocatalytic 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.

Further, based on the total weight of the copolyester, a titanium-based polymerization catalyst may be further contained in an amount of 5 to 40 ppm based on the amount of Ti element.

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

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

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

The present invention also provides a polyester chip containing the polyester composition for heat-adhesive fibers according to the present invention.

The present invention also provides a heat-adhesive composite fiber comprising a core portion and a sheath portion comprising the polyester composition for heat-adhesive fibers according to the present invention surrounding the core portion.

The present invention also provides a heat-adhesive composite fiber alone according to the present invention, or a nonwoven fabric containing the heat-adhesive composite fiber and a polyester-based fiber and formed into a predetermined shape.

According to one embodiment of the present invention, the nonwoven fabric is any one selected from the group consisting of various hygiene products, automobile mattresses, building built-in materials, bedding materials, clothing heat insulating materials and agricultural heat insulating materials. Can be one.
[The invention's effect]

According to the present invention, it is possible to exhibit excellent spinnability to fibers and excellent thermal adhesion, and at the same time, it is possible to exhibit a significantly improved tactile sensation and dyeability in an applied article. In addition, the change with time is minimized at room temperature, and the storage stability can be improved. As a result, when the polyester composition is produced into chips, the drying time can be significantly reduced and the production time can be significantly shortened. As a result, the article embodied by utilizing this is also excellent in storage stability because the change with time is minimized even under storage conditions such as summer (for example, 40 ° C or higher), so that the initial shape of the article can be deformed. It is possible to prevent deformation during use. In addition, it can be widely used in various hygiene products due to its excellent deodorant and hydrophilic properties.

It is sectional drawing of the composite fiber by one Example of this invention.

[Best mode for carrying out the invention]
Hereinafter, examples of the present invention will be described in detail so as to be easily carried out by a person having ordinary knowledge in the technical field to which the present invention belongs. The present invention may be embodied in a variety of different forms and is not limited to the examples described herein.

The polyester composition for heat-adhesive fibers according to the present invention is an esterified compound obtained by reacting an acid component containing terephthalic acid and a diol component containing ethylene glycol with a compound represented by the following chemical formula 1 and a compound represented by the chemical formula 2. Includes polycondensed copolyester and deodorant.

First, the acid component contains an aromatic polyvalent carboxylic acid having 6 to 14 carbon atoms, which is not terephthalic acid, and an aliphatic polyvalent carboxylic acid having 2 to 14 carbon atoms and / or a sulfonic acid. Further metal salts can be included.

As the aromatic polyvalent carboxylic acid having 6 to 14 carbon atoms, those known as acid components used for producing polyester can be used without limitation, but dimethyl terephthalate, isophthalic acid and dimethyl are preferable. It can be any one or more selected from the group consisting of isophthalates, and more preferably isophthalic acid from the viewpoint of reaction stability with terephthalic acid, ease of handling and economics.

Further, as the aliphatic polyvalent carboxylic acid having 2 to 14 carbon atoms, those known as acid components used for producing polyester can be used without limitation, but as a non-limiting example thereof, there is no limitation. Any one selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, citric acid, pimelic acid, azelaic acid, sebacic acid, nonanoic acid, decanoic acid, dodecanoic acid and hexadecanoic acid. It can be one or more.

Further, the sulfonic acid metal salt may be sodium 3,5-dicarbomethoxybenzenesulfonate.

On the other hand, other components other than terephthalic acid as the acid component can reduce the heat resistance of the polyester composition, and are preferably not contained. However, if other types of acid components are further contained in consideration of reaction stability with terephthalic acid, ease of handling, economic viewpoint, etc., it is better to contain isophthalic acid, and in this case also, isophthalic acid. The acid is preferably contained in an amount of 1 to 10 mol% based on the acid component. If isophthalic acid is provided in an amount of less than 1 mol% based on the acid component, it may be difficult to develop high thermal adhesion properties at an additional low temperature of interest, and an isophthalic acid is provided in an amount of more than 10 mol%. In this case, the embodied article becomes hard and the soft tactile sensation is remarkably lowered, and even if the glass transition temperature becomes excessively low, the deterioration of heat resistance may become a problem. Further, in copolyester, the compound represented by the chemical formula 1 described later, the compound represented by the chemical formula 2 and the total content of isophthalic acid are excessively increased, so that the compound acts as a main component capable of forming crystals. It may be difficult to achieve the object of the invention, such as significantly reducing the thermal adhesion characteristics at the temperature at which the compound is applied.

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

First, the compound represented by the chemical formula 1 can lower the crystallinity and the glass transition temperature of the produced polyester composition so as to exhibit excellent thermal adhesion performance. In addition, after being manufactured in the form of fibers, it is possible to dye under normal pressure conditions in the dyeing process, further facilitating the dyeing process, excellent dyeing characteristics, improved washing fastness, and molded products such as non-woven fabrics. It is possible to improve the tactile sensation of. Preferably, the compound represented by the chemical formula 1 can be contained in the diol component in an amount of 13 to 40 mol%, more preferably 20 to 40 mol%, still more preferably 30 to 40 mol%. If the compound represented by Chemical Formula 1 is provided in an amount of less than 13 mol% based on the diol component standard, it has excellent spinnability, but the bondable temperature becomes high or the thermal adhesion property deteriorates, and the application is used. There is a risk that it can be restricted. Further, if the compound represented by the chemical formula 1 is provided in an amount of more than 40 mol%, the spinnability is not good, which may cause a problem that it is difficult to commercialize the compound. The characteristics may deteriorate.

On the other hand, preferably, the compound represented by the chemical formula 1 can be contained in an amount of 20 mol% or more, and through this, the thermal adhesion characteristics of the polyester composition at a low temperature can be further improved together with the compound represented by the chemical formula 2 described later. , There is an advantage that the drying time can be significantly reduced when the polyester composition is chipped.

The compound represented by the chemical formula 2 has a remarkable glass transition temperature of the compound represented by the chemical formula 1 while further improving the thermal adhesion characteristics of the polyester composition produced together with the compound represented by the chemical formula 1 described above. It is possible to prevent such a decrease, minimize the change with time, and improve the storage stability despite the storage temperature of 40 ° C. or higher. The compound represented by the chemical formula 2 in relation to the heat-adhesiveness has appropriate shrinkage characteristics for the heat-adhesive fiber using the embodied polyester composition when used in combination with the compound represented by the chemical formula 1. By expressing and further increasing the point adhesive force at the time of thermal adhesion by expressing such characteristics, it is possible to develop more enhanced thermal adhesion characteristics.

Preferably, the compound represented by the chemical formula 2 can be contained in the diol component in an amount of 1 to 20 mol%, more preferably 1 to 10 mol%, still more preferably 1 to 6 mol%.

If the compound represented by Chemical 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, the storage stability is not good, and the change with time may be very large. There is a fear that. Further, when used together with the compound represented by the above-mentioned chemical formula 1, if the compound represented by the chemical formula 2 is contained in an amount of more than 20 mol%, the spinnability is not good and commercialization is difficult. In some cases, when isophthalic acid is additionally contained, the crystallinity is sufficiently reduced to have no further effect, and when the content of the added isophthalic acid is increased, the crystallinity is rather crystalline. May not achieve the object of the invention, such as being able to significantly reduce excellent thermal adhesion properties at a target temperature. Further, when it is embodied in a fibrous form or the like, shrinkage is remarkably greatly exhibited, which makes processing difficult.

According to a preferred embodiment of the present invention, the total content of the compound represented by the chemical formula 1 and the compound represented by the chemical formula 2 is preferably contained in the diol component in an amount of 30 to 45 mol%. More preferably, it may be contained in an amount of 33 to 41 mol%. If they are contained in less than 30 mol%, the crystallinity of the copolyester increases, making it difficult to develop a high melting point or to realize a softening point at a low temperature, resulting in a heat-bondable temperature. It will be significantly higher and may not exhibit excellent thermal adhesion properties at low temperatures. Further, if the compound represented by the chemical formula 2 is contained in an amount of more than 45 mol%, the polymerization reactivity and the spinnability may be significantly lowered, and the crystallinity of the produced copolyester is rather increased. , It may be difficult to develop high thermal adhesion properties at the target temperature.

At this time, the compound represented by the above-mentioned chemical formula 1 may be contained in the diol component in a content (mol%) further larger than that of the compound represented by the chemical formula 2. If the compound represented by the chemical formula 1 is contained in a smaller amount or in the same amount than the compound represented by the chemical formula 2, it is difficult to develop the desired thermal adhesion property and the compound must be bonded at a high temperature, so that it is developed. There may be restrictions on the use of these products. In addition, excessive shrinkage characteristics may make it difficult to process the developed product. As a result, there may be a problem that it is difficult to use it for the intended purpose.

On the other hand, the diol component may further contain other types of diol components in addition to the compound represented by the above-mentioned chemical formula 1, the compound represented by the chemical formula 2, and ethylene glycol.

The other type of diol component may be a known diol component used in the production of polyester, and thus the present invention is not particularly limited thereto, but as a non-limiting example thereof, the number of carbon atoms is 2 to 14. Can be an aliphatic diol component of, specifically 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, propylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene. It may be any one or more selected from the group consisting of glycols, heptamethylene glycols, octamethylene glycols, nonamethylene glycols, decamethylene glycols, undecamethylene glycols, dodecamethylene glycols and tridecamethylene glycols. However, in order to have heat resistance as well as heat adhesion properties of the desired level, it does not further contain other types of diol components other than the compound represented by the chemical formula 1, the compound represented by the chemical formula 2, and ethylene glycol. It is preferable that diethylene glycol in particular may not be substantially contained in the diol component used to obtain copolyester. If diethylene glycol is contained in the diol component, the glass transition temperature may drop sharply, and even when the compound represented by the chemical formula 2 is provided, the desired level of heat resistance may not be achieved. At this time, the meaning that the diol component does not substantially contain or does not contain diethylene glycol means that diethylene glycol is not intentionally added during the production of copolyester, and the esterification reaction of the acid component and the diol component, It does not mean that it does not contain diethylene glycol that naturally occurs in the polycondensation reaction. On the other hand, according to one embodiment of the present invention, the content of spontaneous diethylene glycol contained in the polyester composition may be less than 3% by weight of the total composition. If the content of spontaneous diethylene glycol exceeds an appropriate level, there is a problem that the pack pressure is increased at the time of spinning to the fiber, causing frequent yarn breakage, and the spinnability may be significantly reduced.

The above-mentioned acid component and diol component can be produced into copolyester through an esterification reaction and polycondensation using known synthetic conditions in the field of polyester synthesis. At this time, the acid component and the diol component can be added so as to react at a molar ratio of 1: 1.1 to 2.0, but the present invention is not limited thereto.

On the other hand, the acid component and the diol component may be produced into copolyester through an esterification reaction and polycondensation after being mixed at a time at an appropriate molar ratio as described above, or may be added to the acid component and the diol component. During the esterification reaction between ethylene glycol and the compound represented by the chemical formula 1, the compound represented by the chemical formula 2 can be added to produce copolyester through an esterification reaction and polycondensation. On the other hand, there is no particular limitation.

The esterification reaction can further include a catalyst. The catalyst can usually be a catalyst used in the production of polyester, but is preferably a titanium-based polymerization catalyst, and more specifically, a titanium-based polymerization catalyst represented by the following chemical formula 3. sell.

Since the titanium-based polymerization catalyst represented by the 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 as a by-product. The esterification reaction and the polycondensation reaction can proceed within the time required, and through this, coloring due to yellowing can be suppressed. The catalyst may be contained so as to have a total weight of the obtained copolyester of 5 to 40 ppm in terms of titanium atoms, which is preferable because the thermal stability and the color tone of the copolyester are further improved. If it is provided at less than 5 ppm in terms of titanium atom, it may be difficult to properly promote the esterification reaction, and if it is provided in excess of 40 ppm, the reactivity is promoted, but coloring occurs. There can be points.

Also, the esterification reaction can preferably be carried out at a temperature of 200 to 270 ° C. and a pressure of 1100 to 1350 torr (Torr). If the above conditions are not satisfied, there may be a problem that the esterification reaction time becomes long or the esterification compound suitable for the polycondensation reaction cannot be formed due to the decrease in reactivity.

Further, the polycondensation reaction can be carried out under a temperature of 250 to 300 ° C. and a pressure of 0.3 to 1.0 torr (Torr), and if the above conditions are not satisfied, the reaction time is delayed and the degree of polymerization is reduced. There may be problems such as deterioration and induction of thermal decomposition.

On the other hand, a heat stabilizer can be further contained during the polycondensation reaction. The heat stabilizer is for preventing discoloration of the hue through thermal decomposition at a high temperature, and a phosphorus-based compound can be used. As the phosphorus-based compound, as an example, it is better to use phosphoric acids such as phosphoric acid, monomethylphosphoric acid, trimethylphosphoric acid, and triethylphosphate and their derivatives, and among these, trimethylphosphoric acid or triethylphosphate in particular. However, it is more preferable because the effect is excellent. The amount of the phosphorus compound used is preferably 10 to 30 ppm in terms of phosphorus atom with respect to the total weight of the final obtained copolyester. If the phosphorus-based heat stabilizer is used at less than 10 ppm, it is difficult to prevent high-temperature thermal decomposition, so that the polypolyester may discolor, and if it exceeds 30 ppm, it may be disadvantageous in terms of manufacturing cost. There may be a problem that a reaction delay phenomenon occurs due to suppression of catalytic activity by a heat stabilizer during the polycondensation reaction.

The heat-adhesive polyester composition according to the present invention contains a deodorant provided during the polycondensation reaction of the copolyester described above or after the copolyester is obtained. The deodorant has a function of decomposing and reducing or removing harmful gases such as VOC substances such as formaldehyde, ammonia and trimethylamine, and in the case of a known deodorant used for fibers, it should be used without limitation. Can be done. However, it may be a photocatalytic oxide, specifically a transition metal-doped photocatalytic oxide, as it improves the hydrophilicity of the fiber and is more easily activated. A non-photocatalyst means a catalyst that can catalyze through absorption of water even in the absence of light. The transition metal is not particularly limited, but is selected from the group consisting of Zn, Mn, Fe, Cu, Ni, Co, Cr, V, Zr, Mo, Ag, W, Pt and Au in consideration of reactivity. It is preferable to use two or more of the above. Examples of the photocatalytic oxide include TiO ₂ , SrTIO ₃ , ZrO, SnO ₂ , WO ₃ , Bi ₂ O ₃ , Fe ₂ O ₃ , and the like, but TiO ₂ is particularly preferable, and anatase-type TiO is more preferable. ₂ is preferably contained, and more preferably, the anatase-type TiO ₂ photocatalytic oxide may be doped with the transition metals Fe and Ag.

The deodorant is 0.3 to 5.0% by weight, more preferably 0.3 to 2.5% by weight, still more preferably 0.3, based on the total weight of the heat-adhesive polyester composition. It can be provided in ~ 1.2% by weight. If it is provided in an amount of less than 0.3% by weight, it may be difficult to increase the deodorizing properties and hydrophilicity of the desired level, and if it exceeds 5.0% by weight, the single yarn strength decreases and the yarn Spinning workability may deteriorate due to breakage. In addition, even if the yarn is spun without breaking, it is a harmful gas due to the catalytic reaction of a non-photocatalyst activated by moisture or exposed light, for example, ultraviolet rays, during storage or after use in the product. Not only that, it may affect copolyester, which is a fiber-forming component, and the strength of the raw yarn may be further significantly reduced.

In addition, the heat-adhesive polyester composition may further contain a complementary colorant. The complementary colorant is for adjusting the color tone to further strengthen and improve the hue of the dye dyed in the dyeing process that is carried out after being spun into the fiber, and is known in the field of textiles. Non-limiting examples of the dyes that can be added are raw dyes, pigments, vat dyes, disperse dyes, organic pigments and the like. However, preferably, a mixture of blue and red dyes can be used. This is because the cobalt compound generally used as a complementary color agent is harmful to the human body and is not preferable, whereas the complementary color agent mixed with blue and red dyes is harmless to the human body. Therefore, it is preferable. Further, when blue and red dyes are mixed and used, there is an advantage that the color tone can be finely controlled. As an example, the blue dye may be solvent blue 104, solvent blue 122, solvent blue 45 or the like, and the red dye may be solvent red 111, solvent red 179, solvent red or the like as an example. Further, the blue dye and the red dye can be mixed in a weight ratio of 1: 1.0 to 3.0, which is advantageous for exhibiting a remarkable effect in the desired fine color tone control.

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

The polyester composition according to the present invention produced through the method described above can 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 exceeds 0.8 dl / g, the pack pressure is high and there is a problem in spinnability. It is possible.

In addition, the polyester composition has no melting point and can have thermal properties exhibiting softening behavior, preferably having a softening point of 90 to 110 ° C., through which the object of the present invention can be achieved. It can be even more advantageous.

Further, the polyester composition may have a glass transition temperature of 60 to 75 ° C. If the glass transition temperature is less than 60 ° C, the polyester chips, fibers or articles embodied through them will change significantly over time, even under temperature conditions above 40 ° C, for example, such as in summer, and the chips or Interfiber bonding may occur and storage stability may be significantly reduced. In addition, when bonding between chips occurs, spinning defects may occur. As a result, after being embodied in fibers or the like, the shrinkage characteristics may be excessively expressed, and the bonding characteristics may be deteriorated. Further, there may be a problem that the time required for the process is lengthened or the process cannot be smoothly performed due to the limitation of the heat treatment required for the drying process after chip formation, the post-processing process after spinning into the fiber, and the like.

Further, if the glass transition temperature exceeds 75 ° C., the thermal bonding characteristics may be significantly deteriorated, and the execution temperature of the bonding process is limited to a high temperature, which may limit the development of applications.

The polyester composition according to one embodiment of the present invention described above can be embodied in a polyester chip, and the method for producing the polyester chip and the specifications of the chip can follow the production methods and standards known in the art. The invention omits a specific description thereof.

Further, as shown in FIG. 1, the present invention comprises a heat-adhesive composite fiber including a core portion 11 and a sheath portion 12 containing the polyester composition for heat-adhesive fibers according to the present invention surrounding the core portion 11. Embody 10.

The core portion can be used without limitation in the case of a polymer that can be spun into fibers, and as an example, it can be a known polyester-based component having higher heat resistance and mechanical strength than the sheath portion, specifically. It may be polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, etc., but is not limited thereto.

As an example, the core portion and the sheath portion may be composite-spun at a weight ratio of 8: 2 to 2: 8, but the ratio is not limited to this, and the ratio is appropriately adjusted according to the purpose. Can be spun.

The steps of spinning the composite fiber, the spinning device, and the cooling, drawing, and the like of the composite fiber after spinning utilize the conditions, devices, and processes known in the art, or appropriately deform the composite fiber. The present invention is not particularly limited to this, as it can be done.

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. Further, the fineness of the composite fiber is 1 to 15 denier, and the fiber length can be 1 to 100 mm as an example.

On the other hand, it is clarified that the heat-adhesive polyester composition according to one embodiment of the present invention can be spun alone and embodied in a single heat-adhesive fiber, unlike FIG. 1.

Further, the present invention includes the above-mentioned heat-adhesive composite fiber and a non-woven fabric embodied including the heat-adhesive single fiber.

The non-woven fabric can be embodied as a heat-adhesive fiber alone such as a heat-adhesive composite fiber or a heat-adhesive single fiber, or by mixing a polyester-based fiber as a support fiber with the heat-adhesive fiber. As an example, the heat-adhesive fiber and the polyester-based fiber can be single fibers, and after each single fiber is mixed and opened, a nonwoven fabric can be produced by heat treatment.

According to one embodiment of the present invention, the heat-adhesive fiber and the polyester-based fiber can be mixed at a ratio of 3: 7 to 1: 9, but the present invention is not limited to this, and the application and the like are taken into consideration. Can be changed appropriately.

Further, the heat treatment may be 100 to 180 ° C., more preferably 120 to 180 ° C., through which further improved adhesive properties can be exhibited.

Further, the porous structure is one selected from the group consisting of various hygiene products, automobile mattresses, building built-in materials, bedding materials, clothing heat insulating materials and agricultural heat insulating materials as an example. Yes, but not limited to this.
[Mode for carrying out the invention]

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 and should be construed as an aid to the understanding of the present invention. Must be.

<Example 1>
38 mol% of the compound represented by the following chemical formula 1 and 3 mol% of the compound represented by the following chemical formula 2 are added as the diol component, 59 mol% of ethylene glycol is added as the residual diol component, and 100 mol% of terephthalic acid is added as the acid component. Then, the acid component and the diol component were esterified at a ratio of 1: 1.5 at 250 ° C. under a pressure of 1140 torr (torr) to obtain an ester reaction product, and the reaction rate was 97.5%. there were. The formed ester reaction product is transferred to a polycondensation reactor, and based on the total weight of copolyester obtained, a titanium compound represented by the following chemical formula 3 is 15 ppm (based on Ti element) as a polycondensation catalyst, and a heat stabilizer. As a result, 25 ppm of triethylphosphate (based on P element) was added and the pressure was gradually reduced to 0.5 torr (torr) as the final pressure, and the temperature was raised to 285 ° C. to carry out a polycondensation reaction to form copolyester. Then, 1% by weight of the anatase-type TiO ₂ photocatalytic oxide doped with the transition metals Fe and Ag was added to the polyester composition based on the total weight of the produced polyester composition, and the polyester composition for the heat-adhesive fiber was added. I got the thing.

Then, the polyester composition was produced by a usual method into polyester chips having a width, a length, and a height of 2 mm × 4 mm × 3 mm, respectively.

Then, in order to produce a core-sheath type composite fiber having the polyester composition as a sheath and a polyethylene late phthalate (PET) having an intrinsic viscosity of 0.65 dl / g as a core, it is embodied in the polyester composition. After the polyester chips and PET chips were put into the hopper and then melted, they were put into the core-sheath type spinneret, and then the core and sheath had a weight ratio of 5: 5 at a spinning speed of 1000 mpm at 275 ° C. The composite was spun so as to be, and stretched 3.0 times to produce a core-sheath type heat-adhesive composite fiber as shown in Table 1 below, which had a fiber length of 51 mm and a fineness of 4.0 de.

<Examples 2 to 14>
Although it is produced in the same manner as in Example 1, the composition ratio of the monomers for producing copolyester is changed as shown in Table 1, Table 2 or Table 3 below, and Table 1, Table 2 or the following Table 2 or Polyester chips as shown in Table 3 and core-sheath type composite fibers using the same were produced.

<Comparative Examples 1 to 4>
Although it is produced in the same manner as in Example 1, the composition of the monomer for producing copolyester is changed as shown in Table 2 below, and the polyester chip as shown in Table 2 below and the core using the same are used. A sheath type composite fiber was produced.

<Experimental Example 1>
The following physical characteristics were evaluated for the polyester chips produced by Examples and Comparative Examples and the core-sheath type heat-adhesive composite fiber, and the results are shown in Tables 1 to 3 below.

1. 1. Intrinsic Viscosity After melting with orthochlorophenol (Ortho-ChloroPhenol) as a solvent for 30 minutes at a concentration of 2.0 g / 25 ml for polyester chips, the temperature is kept constant at 25 ° C for 30 minutes, and a CANON viscometer is used. Was analyzed from an automatic viscosity measuring device connected to the device.

2. 2. Glass transition temperature and melting point The glass transition temperature and melting point were measured using a differential thermal analyzer, and the analysis conditions were such that the temperature rise rate was 20 ° C./min.

3. 3. Polyester chip drying time After the produced polyester composition is made into chips (chip), the moisture content is measured at 55 ° C. at 4 hour intervals with a vacuum dryer, and the measurement result shows the time when the moisture content is 100 ppm or less. Shown by drying time.

4. Single fiber storage stability Specializes in the fusion state between fibers by applying a pressure of 2 kgf / cm ² to 500 g of manufactured core-sheath composite fiber in a chamber with a temperature of 40 ° C and a relative humidity of 45% and leaving it for 3 days. Ten people in the house observed it with the naked eye, and as a result, the case where fusion did not occur was evaluated with 10 points, and the case where all fusion occurred was evaluated with 0 to 10 points as a reference, and then the average value was calculated. As a result, when the average value is 9.0 or more, it is very excellent (◎), when it is 7.0 or more and less than 9.0, it is excellent (○), and when it is 5.0 or more and less than 7.0, it is normal (Δ). ), Less than 5.0 are indicated by bad (x).

5. Spinning workability Spinning workability is such that the core-sheath type composite fibers spun with the same content in each of the examples and comparative examples are drip (partially fused fiber strands passing through the base or yarn breakage) during the spinning process. The generated value (meaning a mass formed by irregular fusion of the strands later) is counted using a drip sensor, and the drip generation value in Example 1 is used as a reference for the remaining Examples. And the number of drips generated in the comparative example is displayed as a relative percentage.

6. Evaluation of dyeing rate A dyeing solution containing 2% by weight of blue dye based on the weight of the core-sheath composite fiber was dyed at 90 ° C. for 60 minutes at a bath ratio of 1:50. After measuring the spectral reflectance in the visible region (360 to 740 nm, 10 nm interval) for the composite fiber dyed using the color measurement system of Kurabo Industries of Japan, an index of the amount of dyeing based on the CIE 1976 standard. The total K / S value was calculated, and the color acquisition rate of the dye was evaluated.

7. Adhesive strength The manufactured core-sheath composite fiber and polyethylene terephthalate (PET) single fiber (fiber length 51 mm, fineness 4.0 de) are mixed and opened at a ratio of 5: 5, and then at 120 ° C, 140 ° C and 160 ° C. Heat-treated under temperature conditions to embody a hot-melt non-woven fabric with a basis weight of 35 g / m ² , embodied in test pieces measuring 100 mm × 20 mm × 10 mm in width, length and thickness, respectively, based on the KS M ISO 36 method. The adhesive strength was measured using UTM (universal testing machine).

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

8. Soft tactile sensation A sensory test by a group of 10 experts in the same industry was conducted on the non-woven fabric manufactured by heat treatment at a temperature condition of 140 ° C to evaluate the adhesive strength, and as a result of the evaluation, 8 or more people When it was judged to be soft, it was classified as excellent (◎), 6 to 7 people were good (○), 5 to 4 people were normal (Δ), and less than 4 people were bad (×).

As can be confirmed through Tables 1 to 3, in the comparative example, whether the drying time is significantly extended (Comparative Examples 1 to 3) or the spinning workability is not significantly good (Comparative Example 2, Comparative Example 3). , It can be confirmed whether the storage stability of the single fiber becomes very poor (Comparative Example 2, Comparative Example 3), or the morphology is deformed by the adhesive strength evaluation by temperature (Comparative Example 4), and all the physical properties are simultaneously exhibited. Although it can be confirmed that it cannot be satisfied, it can be confirmed that all the physical properties are expressed at an excellent level in the examples.

On the other hand, also in the examples, the example 15 in which the content of the compound represented by the chemical formula 2 is higher than that of the compound represented by the chemical formula 1 is more morphologically evaluated by the adhesive strength evaluation by temperature as compared with the other examples. Can be confirmed to be deformed and not suitable for achieving the desired physical properties.

<Examples 15 to 18>
Although it was produced in the same manner as in Example 1, the content of the deodorant was changed as shown in Table 4 below to produce a core-sheath type composite fiber.

<Comparative Example 5>
Although it was produced in the same manner as in Example 1, the core-sheath type composite fiber as shown in Table 4 was produced without adding a deodorant.

<Experimental Example 2>
The following physical properties were evaluated using the core-sheath type composite fibers according to Examples 1, 15 to 18, Comparative Example 1 and Comparative Example 5, and the results are shown in Table 4.

1. 1. Spinning workability The spinning workability was evaluated by the same method as in Experimental Example 1.

2. 2. Storage stability against moisture and light A non-woven fabric was produced by heat-treating a core-sheath type composite fiber at 130 ° C. After cutting the manufactured non-woven fabric into a predetermined size and preparing two test pieces for each example and comparative example, one test piece prepared in a pre-prepared constant temperature and humidity chamber with a UV lamp ( The test piece 1) was put in and irradiated with ultraviolet rays at a temperature of 25 ° C., a relative humidity of 50% RH, and an intensity of 300 mJ / cm ² for 30 days. The storage stability against moisture and light is the tensile strength of the test piece stored in the constant temperature and humidity chamber for 30 days and the tensile strength of the remaining one test piece (test piece 2, untreated test piece) that is not put into the constant temperature and humidity chamber. The intensities are measured and derived through the following formulas, and it can be evaluated that the larger the value, the greater the decrease in mechanical intensity due to external moisture or light such as ultraviolet rays. At this time, the tensile strength of the test piece 2 was measured at the time when the test piece 1 was put into the constant temperature and humidity chamber and the evaluation was started.

[formula]
Rate of decrease in mechanical strength (%) = [(Tensile strength of test piece 2 (N) -Tension strength of test piece 1 (N)) / Tensile strength of test piece 2 (N)] × 100

3. 3. Gas reduction rate The core-sheath type composite fiber was heat-treated at 130 ° C. to produce a nonwoven fabric, and then cut into 10 cm × 10 cm to prepare a test piece. Put the prepared test piece in a 3L tedler bag, inject the target gas and clean air, seal it, and after 120 minutes, measure each concentration by the gas tech detector tube method, and calculate the gas reduction rate from the following formula 1. Was calculated.

[Calculation formula 1]
Reduction rate (%) = [(C _b -C _a ) / C _b ] x 100

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

4. Absorption For absorbability, a test piece is produced by cutting a non-woven fabric manufactured for evaluation of gas reduction rate into 2.5 cm x 20 cm using the Bilek method, and then the lower side is submerged in a water tank to make a capillary tube. The height absorbed by the test piece due to the phenomenon was measured for 10 minutes.

As can be confirmed with reference to Table 4, the examples containing the deodorant are advantageous in simultaneously satisfying the gas reduction rate, spinning workability, hydrophilicity and storage stability due to light / moisture as compared with Comparative Example 5. Can be confirmed as.

Further, in the case of Comparative Example 1 containing no compound of Chemical Formula 2, even when a deodorant is contained, the absorbency, spinning workability and storage by light / moisture are as compared with those of Example 1 containing the deodorant in the same content. It can be confirmed that the stability is not good.

Although one embodiment of the present invention has been described above, the idea of the present invention is not limited to the examples presented in the present specification, and those skilled in the art who understand the idea of the present invention are within the scope of the same idea. , Other embodiments can be easily proposed by adding, changing, deleting, adding, etc., which are also within the scope of the present invention.

Claims (13)

It contains a copolyester and a deodorant obtained by polycondensing an acid component containing terephthalic acid and an esterified compound obtained by reacting ethylene glycol with a compound represented by the following chemical formula 1 and a diol component containing a compound represented by the chemical formula 2. Polyester composition for heat-adhesive fibers.

The polyester composition for heat-adhesive fibers according to claim 1, wherein the diol component does not contain diethylene glycol. The thermal adhesiveness according to claim 1, wherein the total content of the compound represented by the chemical formula 1 and the compound represented by the chemical formula 2 is contained in the diol component in an amount of 30 to 45 mol%. Polyester composition for textiles. The polyester composition for heat-adhesive fibers according to claim 1, wherein the acid component further contains isophthalic acid in an amount of 1 to 10 mol% based on the acid component. The polyester composition for heat-adhesive fibers according to claim 1, further comprising 1 to 10 ppm of a complementary color agent containing a blue and red dye based on the total weight of the polyester composition. The compound represented by the chemical formula 1 is contained in the diol component in an amount of 20 to 40 mol% based on the diol component, and the compound represented by the chemical formula 2 is contained in an amount of 1 to 10 mol% based on the diol component. The polyester composition for a heat-adhesive fiber according to claim 1, wherein the polyester composition is characterized by the above. The deodorant is a photocatalytic oxide doped with a transition metal, and according to claim 1, the deodorant is provided in an amount of 0.3 to 5.0% by weight based on the total weight of the polyester composition. Polyester composition for heat-adhesive fibers. The polyester composition for heat-adhesive fibers according to claim 1, wherein the titanium-based polymerization catalyst is further contained in an amount of 5 to 40 ppm based on the total weight of the copolyester, based on the amount of Ti elements. The polyester composition for heat-adhesive fibers according to claim 1, wherein a phosphorus-based heat stabilizer is further contained in an amount of 10 to 30 ppm based on the total weight of the copolyester. The polyester composition for heat-adhesive fibers according to claim 1, wherein the polyester composition has no melting point, exhibits softening behavior, and has a glass transition temperature of 60 to 75 ° C. A polyester chip containing the polyester composition for heat-adhesive fibers according to claim 1. With the core
A heat-adhesive composite fiber comprising a sheath portion containing the polyester composition for heat-adhesive fiber according to claim 1 surrounding the core portion. A non-woven fabric containing the heat-adhesive composite fiber according to claim 12 and molded into a predetermined shape.

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