JP2021528547A - Polyester composition for heat-adhesive fiber and heat-adhesive composite fiber containing it - Google Patents

Abstract

The present invention relates to a polyester composition for heat-adhesive fibers and a heat-adhesive composite fiber containing the same. More specifically, the present invention can exhibit a soft and soft touch at the time of bonding, and a polyester for heat-adhesive fibers having low density. The present invention relates to a heat-adhesive composite fiber containing the composition and the polyester composition for heat-adhesive fiber according to the present invention, which has an excellent color yield at the time of dyeing under low temperature and low pressure conditions.
[Selection diagram] Fig. 1

Description

The present invention relates to a polyester composition for heat-adhesive fibers and a heat-adhesive composite fiber containing the same. More specifically, the present invention can exhibit a soft and soft touch at the time of bonding, and a polyester for heat-adhesive fibers having low density. The present invention relates to a heat-adhesive composite fiber containing the composition and the polyester composition for heat-adhesive fiber according to the present invention and having an excellent color yield when dyed under low temperature and low pressure conditions.

In general, polyester is a general term for polymer compounds having an ester bond (-COO) in the molecule, and includes unsaturated polyester resins, alkyd resins, and thermoplastic polyester resins typified by polyethylene terephthalate (PET).

Such polyester fibers have high strength, chemical resistance, excellent heat resistance because they have a melting point in the range of 250 to 255 ° C., and have the advantages of having elasticity against elongation bending, so that they are gentlemen. It has various uses as an industrial material as well as clothing such as clothing and shirts.

However, polyester has a relatively high melting point, and generally, when curing a fiber structure, an adhesive containing formalin (formaldehyde aqueous solution) or an organic solvent, or a hard resin (phenol resin, melanin resin, urea resin) is used. Since such an adhesive containing an organic solvent does not penetrate into the inside of the fabric, the adhesiveness is low and the texture when completed is rough. In addition, most of the substances are highly volatile and harmful to the human body, and there are environmental problems such as toxic gas emission.

In addition, the conventional polyester-based composite fiber composed of a sheath part and a core part uses a low melting point polyester for the sheath part, but since it has extremely low flexibility at the time of adhesion and is rough to the touch, it is suitable for application to interior products. Is difficult in reality, and there is a problem that a high temperature and high pressure environment is required when dyeing composite fibers.

The present invention has been devised in view of the above points, and is a polyester composition for heat-adhesive fibers having a low density, which can exhibit a soft and soft touch at the time of bonding, and the above-mentioned heat-adhesive fibers. It is an object of the present invention to provide a heat-adhesive composite fiber containing a polyester composition and having excellent color yield at the time of dyeing under low temperature and low pressure conditions.

Another object of the present invention is to provide interior fibers including the heat-adhesive composite fibers according to the present invention.

In order to solve the above-mentioned problems, the present invention polycondenses an esterified compound obtained by reacting an acidic component containing terephthalic acid and a diol component containing ethylene glycol with 2-methyl-1,3-propanediol and polyalkylene glycol. Provided is a polyester composition for heat-adhesive fibers, which comprises copolyester.

According to one embodiment of the present invention, the diol component may be substantially free of diethylene glycol.

Further, according to one embodiment of the present invention, the polyalkylene glycol may be contained in an amount of 1 to 10% by weight based on the weight of the esterified compound.

Further, according to one embodiment of the present invention, the polyalkylene glycol may be polyethylene glycol.

Further, according to one embodiment of the present invention, the polyethylene glycol may have a weight average molecular weight of 400 to 12000.

Further, according to one embodiment of the present invention, the polyethylene glycol may have a weight average molecular weight of 400 to 6000.

Further, according to one embodiment of the present invention, the esterified compound may contain the acid component and the diol component in a molar ratio of 1: 1 to 1: 2.

Further, according to one embodiment of the present invention, the 2-methyl-1,3-propanediol may be contained in 25 to 40 mol% of the diol component.

Further, according to one embodiment of the present invention, the 2-methyl-1,3-propanediol may be contained in 29 to 40 mol% of the diol component.

Further, according to one embodiment of the present invention, the acidic component may further contain isophthalic acid contained in 1 to 15 mol% of the acid component.

Further, according to one embodiment of the present invention, the copolyester is composed of an acid component which is terephthalic acid, 60 to 71 mol% ethylene glycol and 29 to 40 mol% 2-methyl-1,3-propanediol. The esterified compound obtained by reacting the diol component with a molar ratio of 1: 1 to 1: 2 and polyethylene glycol having a weight average molecular weight of 400 to 6000 contained in an amount of 1 to 10% by weight based on the weight of the esterified compound. It may be polycondensed.

The present invention also provides a heat-adhesive composite fiber including a core portion containing a polyester-based component and a sheath portion containing a polyester composition for a heat-adhesive fiber according to the present invention surrounding the core portion.

According to one embodiment of the present invention, the composite fiber is mixed and opened with polyethylene terephthalate short fibers at a weight ratio of 1: 1 and then heat-treated at 140 ° C. to have horizontal, vertical, and thickness, respectively. When embodied in test pieces of 100, 20, and 10 mm, the adhesive strength may be 100 N or more when the adhesive strength is measured by UTM (universal testing machine) based on the KS M ISO 36 method.

Further, according to one embodiment of the present invention, the composite fiber has a bath ratio of 1: 1 with respect to a dyeing solution containing 2% by weight of the dye (CI Basic Blue 54) based on the weight of the composite fiber. When dyed at 50 at 120 ° C. and at normal pressure for 40 minutes, the color yield value (K / S value) based on the CIE 1976 standard may be 14 or more.

Further, according to one embodiment of the present invention, the polyester-based component may contain at least one selected from polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate and polybutylene adipate terephthalate.

The present invention also provides interior fibers including the heat-adhesive composite fibers according to the present invention.

According to one embodiment of the present invention, the interior fiber may be applied to any one selected from car seats, bedding, blinds, curtains and interior goods.

The polyester composition for heat-adhesive fibers according to the present invention can exhibit a soft and soft touch at the time of bonding, and has a low density. Therefore, a heat-adhesive composite fiber having an excellent color yield when dyed under low temperature and low pressure conditions can be obtained. Can be embodied. The heat-adhesive composite fiber according to the present invention may be contained in an interior fiber and widely used in car seats, bedding, blinds, curtains, interior goods and the like.

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

Hereinafter, with reference to the accompanying drawings, a detailed description will be made so that a person having ordinary knowledge can easily carry out the embodiment of the present invention in the technical field to which the present invention belongs. The present invention may be embodied in a plurality of different forms and is not limited to the examples described herein.

The polyester composition for heat-adhesive fibers of the present invention will be described.

The polyester composition for heat-adhesive fibers of the present invention is composed of an esterified compound obtained by reacting an acidic component containing terephthalic acid and a diol component containing ethylene glycol with 2-methyl-1,3-propanediol, and polyalkylene glycol. Contains condensed copolyester.

The esterified compound can exhibit thermal adhesion characteristics even at low temperature due to 2-methyl-1,3-propanediol contained in the diol component, and can reduce the density with the esterified compound having low temperature thermal adhesion characteristics. By polycondensing the chain-structured polyalkylene glycol, the copolyester of the present invention has excellent adhesive strength at the time of adhesion, is soft to the touch, is flexible and has excellent spinning workability, and is excellent in low temperature and low pressure environments. It has the advantage of excellent dyeability.

The acid component may further contain isophthalic acid contained in 1 to 15 mol% of the acid component, whereby the glass transition temperature of copolyester is lowered, and the adhesive strength at the time of adhesion and the soft touch are further excellent. May become.

When the above-mentioned isophthalic acid is contained in less than 1 mol% of the above-mentioned acid components, the effects of reducing the glass transition temperature of copolyester, improving the adhesive strength at the time of adhesion, and further improving the soft touch are not exhibited. There is. Further, when the above-mentioned isophthalic acid is contained in an amount of more than 15 mol% of the above-mentioned acid components, not only the soft touch is reduced, but also a large number of by-reactants of cyclic compounds are generated due to the use of isophthalic acid, resulting in spinning. Sometimes it can cause thread breakage.

The 2-methyl-1,3-propanediol contained in the diol component may be contained in an amount of 25 to 40 mol%, more preferably 29 to 40 mol% of the diol component.

When the 2-methyl-1,3-propanediol is contained in an amount of less than 25 mol% of the diol component, the bonding temperature of the copolyester becomes high and it becomes difficult to use it for heat-adhesive fibers. If it is contained in an amount of more than 40 mol%, it may be difficult to achieve the object of the present invention, for example, the melting point increases due to the increase in crystallinity of copolyester.

When the 2-methyl-1,3-propanediol is contained in 29 to 40 mol% of the diol component, or when the 2-methyl-1,3-propanediol is used alone as the diol component. Also, the desired melting point lowering effect can be exhibited, and when used in parallel with isophthalic acid and polyethylene glycol, not only can the melting point be lowered more effectively, but also excellent adhesive strength can be exhibited.

If the diol component contains diethylene glycol other than the naturally occurring amount, the glass transition temperature will be sharply lowered, and the heat resistance may be lowered, resulting in a decrease in aging and storage stability, and the melt viscosity of the spinning yarn. There is a problem that the spinnability is remarkably lowered by inducing frequent yarn breakage.

In the polyester composition for heat-adhesive fibers according to an embodiment of the present invention, since the diol component does not substantially contain diethylene glycol, the fibers are broken during spinning, the cross-sectional uniformity is lowered, and the dyeing is uniform. It is possible to prevent or minimize the problems of deterioration of properties and sudden decrease of heat resistance (glass transition temperature).

However, the diethylene glycol can be naturally generated during the esterification reaction.

The acid component and the diol component may be polymerized at a molar ratio of 1: 1 to 1: 2 to be produced as an esterified compound. If the molar ratio is less than 1: 1, the acidity at the time of polymerization is excessive. If the molar ratio exceeds 1: 2, the degree of polymerization may not be high.

The polymerization of the acid component and the diol component may be carried out under the conditions used for the esterification polymerization reaction usually used in the art, and as an example, the acid component and the diol component may be polymerized at 200 to 260 ° C. for 150 to 240 minutes at 40 to 80 rpm. It may be done through stirring at a rate, but is not limited to this.

Next, the copolyester of the present invention may be produced by polycondensing the above esterified compound with polyalkylene glycol.

The polyalkylene glycol may be preferably polyethylene glycol.

More preferably, the polyethylene glycol may have a weight average molecular weight of 400 to 12000, and when the weight average molecular weight of the polyethylene glycol is less than 400, the desired soft touch and the development of a dye transfer effect are exhibited. It is difficult, and if it exceeds 12000, the polymerization reactivity may decrease and the thermal stability of the formed polymer may deteriorate due to the decrease in heat resistance. Most preferably, the polyethylene glycol may have a weight average molecular weight of 400 to 6000, which has the effect of preventing or minimizing the decrease in heat resistance as well as the desired soft touch and dye transfer. It can be even better.

The polyalkylene glycol may be contained in an amount of 1 to 10% by weight based on the weight of the esterified compound. If the polyalkylene glycol is contained in an amount of less than 1% by weight based on the weight of the esterified compound, it is difficult to achieve the desired soft touch and dye transfer effect, and the polyalkylene glycol is co-produced in a low temperature and low pressure environment. The dyeability of polyester may be reduced, and if it is contained in excess of 10% by weight, not only the polymerization reactivity is lowered and the thermal stability of the formed polymer is lowered, but also the thermal stability is deteriorated. It may be difficult to achieve the object of the present invention, such as a decrease in spinning workability.

Further, more preferably, the polyalkylene glycol may be contained in an amount of 1 to 5% by weight based on the weight of the esterified compound, whereby the polycondensation reaction can be maintained more stably and is produced. The heat resistance of the polypolyester can be ensured at a more stable level.

As described above, the esterified compound can exhibit thermal adhesion properties even at low temperatures due to 2-methyl-1,3-propanediol contained in the diol component, and has a higher density than the esterified compounds having low temperature thermal adhesion properties. By polyalkylene glycol having a flexible chain structure capable of reducing the amount of It has excellent dyeability even in low temperature and low pressure environments, and the above copolyester has an acid component of terephthalic acid, 60 to 71 mol% ethylene glycol and 29 to 40 mol% 2-methyl-1,3-. The weight average molecular weight of 400 to 6000 in which the diol component composed of propanediol is reacted at a molar ratio of 1: 1 to 1: 2 and contained in an amount of 1 to 10% by weight based on the weight of the esterified compound and the esterified compound is determined. When the polyethylene glycol to be produced is produced by polycondensation, it may be more excellent in soft touch, dyeability in low temperature and low pressure environments, and adhesive strength at the time of adhesion. In particular, in relation to thermal adhesion, there is an advantage that excellent adhesive strength is exhibited in a wide temperature range from low temperature to high temperature.

Next, the heat-adhesive composite fiber of the present invention will be described.

The heat-adhesive composite fiber 10 of the present invention includes a core portion 11 containing a polyester-based component and a sheath portion 12 containing a polyester composition for heat-adhesive fibers according to the present invention surrounding the core portion 11.

The polyester-based component contained in the core portion 11 may contain at least one selected from polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polybutylene adipate terephthalate.

The fineness of the composite fiber 10 is preferably 1 De to 15 De in order to minimize the problem of deterioration in spinning workability. Since the composition of the polyester composition for heat-adhesive fibers is as described above, detailed description thereof will be omitted.

The composite fiber may be produced by a composite spinning method commonly used in the art, and a melt composite spinning method may be used as an example, but the present invention is not limited thereto.

Further, the heat-adhesive composite fiber according to the present invention has excellent adhesive strength at the time of adhesion, is soft to the touch, is flexible and has excellent spinning workability, and has excellent dyeability even in low temperature and low pressure environments. Since the polyester composition for sex fibers is contained in the sheath portion, it may have an excellent adhesive strength of 100 N or more when measuring the adhesive strength based on the method of KS M ISO 36, and 2 based on the weight of the composite fiber. When a dyeing solution containing a weight% dye (CI Basic Blue 54) was dyed at a bath ratio of 1:50 at 120 ° C. and normal pressure for 40 minutes, the color yield value (K /) based on the CIE 1976 standard was obtained. S value) may have an excellent dyeing property of 14 or more.

Next, the interior fiber including the heat-adhesive composite fiber according to the present invention will be described. Since the interior fiber can be dyed in a low temperature and low pressure environment by containing the heat-adhesive composite fiber according to the present invention, the cost of the dyeing process can be significantly reduced and the adhesive strength is excellent. , While ensuring excellent durability of interior products, soft touch may be excellent. Thereby, the interior fiber may be applied to any one selected from car seats, bedding, blinds, curtains, and interior goods.

<Form for making an invention>

Although the present invention will be described in more detail with reference to the following examples, 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.

<Example 1>
After adding terephthalic acid (TPA), ethylene glycol (EG) and 2-methyl-1,3-propanediol (MPO) to the transesterification tank, they are reacted at a temperature of 250 ° C. by a usual method to prepare an esterified compound. Manufactured. During the production of the esterified compound, the acid component and the diol component were mixed at a molar ratio of 1: 1.5, and EG was contained in 65 mol% and MPO was contained in 35 mol% among the diol components.

After adding 2% by weight of polyethylene glycol (weight average molecular weight: 1000) based on the weight of the produced esterified compound, the temperature is gradually increased to 285 ° C. while gradually reducing the pressure so that the final decompression degree is 1.0 Torr or less. Copolyester was obtained by thermal and axial polymerization.

The produced low melting point copolyester is used as the sheath part, and polyethylene terephthalate is used as the core part, and the polyester composite fiber (fineness: 4 de, length: 51 mm) was manufactured.

<Examples 2 to 14>
The same procedure as in Example 1 is carried out, but as shown in Table 1 below, at least one of the acid component, the diol component, these contents, the polyethylene glycol content and the weight average molecular weight thereof contained in the esterified compound is different. , Manufactured composite fibers.

<Comparative Examples 1 to 4>
The same procedure as in Example 1 is carried out, but as shown in Table 1 below, at least one of the acid component, the diol component, these contents, the polyethylene glycol content and the weight average molecular weight thereof contained in the esterified compound is different. , Manufactured composite fibers.

<Experimental example 1>
The glass transition temperature of the copolyester produced in Examples and Comparative Examples and the viscosity of the polyester composition were measured to determine the adhesive strength, color yield, soft touch and spinning workability of the composite fibers produced in Examples and Comparative Examples. The evaluation was performed and the results are shown in Table 1 below.

(1) Measurement of glass transition temperature The glass transition temperature (Tg) of copolyesters produced in Examples and Comparative Examples was measured using a differential scanning calorimeter (DSC), and the results are shown in Table 1 below. The heating rate at the time of measuring the glass transition temperature was set to 20 ° C./min.

(2) Viscosity measurement The copolyesters produced in Examples and Comparative Examples were added to ortho-chlorophenol (Ortho-ChloroPhenol) at a concentration of 0.2 g / 25 ml, and then melted at 110 ° C. for 30 minutes. After constant temperature of the molten solution at 25 ° C. for 30 minutes, the viscosity was measured from an automatic viscosity measuring device connected with a CANON viscometer.

(3) Evaluation of Adhesive Strength The polyester composite fibers produced in Examples and Comparative Examples are mixed and opened with general polyethylene terephthalate short fibers using a carding machine in a 5: 5 manner, and then 140. A non-woven fabric having ^{a basis weight of 35 g / m 2} is embodied by heat treatment with a tenter under a temperature condition of ° C. The adhesive strength based on the method of KS m ISO 36 was measured by a universal testing machine).

(4) Color yield evaluation The color yield evaluation is performed at 120 ° C. at a bath ratio of 1:50 with respect to a dyeing solution containing 2% by weight of the dye (CI Basic Blue 54) based on the weight of the composite fiber. After dyeing the composite fiber at normal pressure for 40 minutes, the spectral reflectance of the visible region (360 to 740 nm, 10 nm interval) for the dyed composite fiber was measured using the color measurement system of KURABO of Japan. The color yield of the dye was evaluated by calculating the Total K / S value, which is an index of the amount of dyeing based on the CIE1976 standard.

(5) Soft touch evaluation When the soft touch of the composite fiber is evaluated by a sensory test method by a panel consisting of 10 experts in the same industry, and as a result of the sensory test, 8 or more people are judged to be soft. Excellent (◎), 6 to 7 people were classified as good (○), 5 to 4 people were classified as normal (Δ), and less than 4 people were classified as poor (×).

(6) Evaluation of Spinning Workability The spinning workability of composite fibers is evaluated by a sensory test method by a panel consisting of 10 experts in the same industry, based on the presence or absence of yarn breakage during spinning and cross-sectional uniformity. Excellent (◎) when it is judged that 8 or more people are excellent in spinning workability as a result of sensory test, 6 to 7 people are good (○), 5 to 4 people are normal (△), 4 people Less than is classified as defective (x).

With reference to Table 1 above, it can be confirmed that Example 4 containing 3 mol% of IPA during the esterification reaction is superior in adhesive strength to Example 3 not containing IPA. Further, it can be confirmed that in Comparative Example 4 containing DEG at the time of the esterification reaction, the spinning workability at the time of spinning the composite fiber is remarkably lowered.

On the other hand, it can be confirmed that Comparative Example 2 containing no PEG during the polycondensation reaction not only has extremely low adhesive strength and color yield, but also cannot realize an excellent soft touch. On the other hand, Example 6 containing 9% by weight of PEG during the polycondensation reaction was confirmed to be excellent in adhesive strength, color yield, soft touch and spinning workability, but contained 13% by weight of PEG. Comparative Example 3 had a problem that the polymerization itself was difficult.

Further, Example 2 containing PEG having a weight average molecular weight of 200 during the polycondensation reaction is superior in adhesive strength and color yield to Example 1 having a weight average molecular weight of 500, and is also excellent in soft touch. It can be confirmed that it is at the same level. On the other hand, Example 10 containing PEG having a weight average molecular weight of 13500 has a problem that the polymerization itself is difficult, and Example 9 containing PEG having a weight average molecular weight of 11200 has adhesive strength, color yield and softness. The feel was remarkably excellent, but the spinning workability was at a normal level. On the other hand, it can be confirmed that Example 8 containing PEG having a weight average molecular weight of 6600 is not only excellent in adhesive strength, color yield and soft touch, but also excellent in spinning workability.

Further, Example 11 containing 22 mol% of MPO during the esterification reaction is excellent in color yield, soft touch and spinning workability, but has a problem that the adhesive strength is relatively low. On the other hand, it can be confirmed that in Example 12 containing the MPO in an amount of 27 mol%, the adhesive strength was significantly increased as compared with Example 11. Further, it can be confirmed that the adhesive strength of Example 13 containing 38 mol% of MPO is remarkably higher than that of Example 14 containing 43 mol% of MPO, and the color yield and spinning workability are further excellent.

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., but it can be said that this is also within the scope of the present invention.

Claims (17)

Polyester for heat-adhesive fibers containing an acid component containing terephthalic acid and a copolyester obtained by polycondensing polyalkylene glycol with an esterified compound obtained by reacting ethylene glycol with a diol component containing 2-methyl-1,3-propanediol. Composition. The polyester composition for heat-adhesive fibers according to claim 1, wherein the diol component does not substantially contain diethylene glycol. The polyester composition for heat-adhesive fibers according to claim 1, wherein the polyalkylene glycol is contained in an amount of 1 to 10% by weight based on the weight of the esterified compound. The polyester composition for heat-adhesive fibers according to claim 1, wherein the polyalkylene glycol is polyethylene glycol. The polyester composition for heat-adhesive fibers according to claim 4, wherein the polyethylene glycol has a weight average molecular weight of 400 to 12000. The polyester composition for heat-adhesive fibers according to claim 4, wherein the polyethylene glycol has a weight average molecular weight of 400 to 6000. The polyester composition for heat-adhesive fibers according to claim 1, wherein the esterified compound contains the acid component and the diol component in a molar ratio of 1: 1 to 1: 2. The polyester composition for heat-adhesive fibers according to claim 1, wherein the 2-methyl-1,3-propanediol is contained in 25 to 40 mol% of the diol component. The polyester composition for heat-adhesive fibers according to claim 8, wherein the 2-methyl-1,3-propanediol is contained in 29 to 40 mol% of the diol component. The polyester composition for heat-adhesive fibers according to claim 1, wherein the acid component further contains isophthalic acid contained in 1 to 15 mol% of the acid component. The copolyester has an acid component of terephthalic acid, a diol component consisting of 60 to 71 mol% ethylene glycol and 29 to 40 mol% 2-methyl-1,3-propanediol of 1: 1 to 1: 2. The heat according to claim 1, wherein the esterified compound reacted in a molar ratio and polyethylene glycol having a weight average molecular weight of 400 to 6000 contained in 1 to 10% by weight based on the weight of the esterified compound are polycondensed. Polyester composition for adhesive fibers. The core part containing polyester components and
A sheath portion containing the polyester composition for heat-adhesive fibers according to claim 1, which surrounds the core portion, and a sheath portion.
Including heat-adhesive composite fibers. The composite fiber is mixed and opened with polyethylene terephthalate short fibers at a weight ratio of 1: 1 and then heat-treated at 140 ° C. to test pieces having widths, lengths, and thicknesses of 100, 20, and 10 mm, respectively. The heat-adhesive composite fiber according to claim 12, which has an adhesive strength of 100 N or more when the adhesive strength is measured by UTM (universal testing machine) based on the KS M ISO 36 method. When the composite fiber is dyed with a dyeing solution containing 2% by weight of the dye (CI BasicBlue 54) based on the weight of the composite fiber at a bath ratio of 1:50 at 120 ° C. and normal pressure for 40 minutes. , The heat-adhesive composite fiber according to claim 12, wherein the color yield value (K / S value) based on the CIE 1976 standard is 14 or more. The heat-adhesive composite fiber according to claim 12, wherein the polyester-based component contains at least one selected from polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polybutylene adipate terephthalate. An interior fiber comprising the heat-adhesive composite fiber according to claim 12. The interior fiber according to claim 16, wherein the interior fiber is applied to any one selected from car seats, bedding, blinds, curtains and interior goods.

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