WO2004053218A1

WO2004053218A1 - Blended woven or knitted fabrics containing polyurethane elastic fibers and process for the production thereof

Info

Publication number: WO2004053218A1
Application number: PCT/JP2003/015778
Authority: WO
Inventors: Kunihiro Fukuoka; Kouji Nishio
Original assignee: Nisshinbo Industries, Inc.
Priority date: 2002-12-12
Filing date: 2003-12-10
Publication date: 2004-06-24
Also published as: JP4193064B2; KR20050085304A; EP1595987A1; KR101165244B1; JPWO2004053218A1; CN1723307A; TWI334892B; AU2003289006A1; EP1595987A4; US20060030229A1; CN100567604C; EP1595987B1; TW200427884A

Abstract

A blended woven or knitted fabric which contains both highly fusible polyurethane fibers exhibiting a retention of tenacity of 50% or above after the dry heat treatment at 150°C for 45 s at 100 % elongation and a melting point of 180°C or below and at least one kind of nonelastic yarns and which is produced by fusing the polyurethane fibers to each other or the polyurethane fibers to the nonelastic yarns at the crossover points by dry- or wet-heat setting; and a process for the production thereof.

Description

Specification

Polyurethane bullet! Woven and knitted fabric mixed with raw fiber and method for producing the same

The present invention relates to a woven or knitted fabric using a mixture of a polyurethane elastic fiber and another fiber, and a method for producing the same. More specifically, the fabric made from the woven or knitted fabric is repeatedly deformed and stretched while worn, resulting in "deformation, misalignment, and softness" of the fabric, and so-called "fraying" in which the yarn comes off from the cut portion. Ladder-shaped scratches or misalignment, ie, "Run, Densen", the fabric becomes curved "curl" and cutting, sewing Only the elastic fiber comes out from the mesh part of the sewn product and the fabric stretches partially Circular knitted fabric such as jersey knitting, rubber knitting, pearl knitting and other weft knitting, warp knitting such as sari knitting, denbi knitting, cord knitting, atlas knitting, etc. The present invention relates to a woven or knitted fabric mixed with polyurethane elastic fibers and a method for producing the same. Background art

Products using stretch fabrics such as weft knitted fabrics, warp knitted fabrics, and woven fabrics mixed with polyurethane-based fibers are widely used because of their large elongation, good resilience from stretched state, and good fit. However, when the product made by cutting and sewing the fabric mixed with polyurethane elastic fiber is repeatedly stretched, the fabric is deformed and becomes uneven, resulting in "deformation, misalignment, softness", and the thread coming off "fraying". Ladder-like scratches and shifts have occurred in the fabric structure, and "Run, Densen" and problems such as curling of the fabric are easy to occur. In addition, the so-called “slip-in”, in which the polyurethane elastic fiber comes out of the seam at the sewn portion due to repeated elongation, is likely to occur. Naturally, the portion of the fabric from which the elastic fibers have slipped out due to the slip-in has a problem in that the shrinkage force is lost, so that density unevenness occurs in the fabric and the fabric cannot be worn.

These phenomena also occur in woven or knitted fabrics using elastic fibers other than polyurethane elastic fibers, but are particularly remarkable in the case of highly elastic polyurethane elastic fibers.

The following proposals have been made to address these problems.

(1) Suppress the shrinkage of raw polyurethane fiber. (i) The extension ratio of the polyurethane elastic fiber is not so high.

(i i) Increase the processing temperature of the woven or knitted fabric to suppress the shrinkage of the polyurethane elastic fiber

(iii) Select an elastic fiber having a high setting property.

(2) By increasing the setting temperature, the polyurethane bows are fused to each other at the intersections of the single raw fibers.

(3) Use low-melting-point polyurethane elastic fiber to prevent fusion at low temperatures.

(4) The mesh density during sewing is increased to prevent the polyurethane elastic fiber from slipping, and to reduce slip-in.

(5) When used in the form of a covering thread, increase the number of twists or use double covering. A method of air-entanglement of a covering yarn and another yarn has also been proposed (see JP-A-04-11036).

(6) Slip-in or weaving or knitting that is difficult to slip (see JP-A-2002-69804 and JP-A-2002-13052).

However, the method of reducing the elongation ratio of polyurethane elastic fiber as in (1) (i) reduces the elasticity of the fabric and increases the cost due to the increase in the amount of polyurethane elastic fiber used. Also, the method of (1) and (ii) increasing the set temperature to reduce the shrinkage of the polyurethane elastic fiber is not preferable because it causes a change in the texture of the mating fiber and a reduction in the color fastness of the woven or knitted fabric. . Furthermore, in the case of weft knitted fabrics and warp knitted fabrics where there is an intersection between elastic fibers as in (2), problems such as curling and slip-in can be prevented by a method of fusing viscous fibers. Since a set is necessary, there is still a problem that the texture of the mixed partner fiber may change and the robustness may decrease. In addition, increasing the mesh density of sewing as in (4) does not meet the market requirements, because the sewn portion becomes thicker and the product is not well-centered.

On the other hand, if an elastic fiber that fuses at a low temperature as in (3) can be used, it can be fused at a low set temperature of 140 to 160 ° C. Insufficient setting of the melting point polyurethane elastic fiber, resulting in poor dimensional stability of the fabric, and setting in a high temperature region where the high melting point polyurethane elastic fiber can be sufficiently set, generally lowers the elasticity of the fiber that fuses at low temperatures. But large, dough This is not preferable because the elongation recovery force of the rubber becomes weak. The use of special composite yarns or special knitting methods as in (4) and (5) limit the properties of the product.

A method has also been proposed in which a knitted fabric using two polyetherester elastic fibers having different melting points is heat-treated at 200 ° C. to prevent misalignment (Japanese Unexamined Patent Publication No. 2001-159590). However, polyetherester elastic fibers are not satisfactory in terms of elastic recovery and distortion in comparison with polyurethane elastic fibers in terms of elastic recovery force and distortion.

The present invention provides an elastic fiber in which the used polyurethane elastic fiber and non-elastic yarn do not come off from the cut or sewn portion, and the fabric is stable, and misalignment, softness, fraying, orchids, densen, and Karl Slipin are unlikely to occur. An object of the present invention is to provide a woven or knitted fabric and a method for producing the same. Disclosure of the invention

The present inventors have conducted intensive studies in order to achieve the above-mentioned object, and as a result, obtained by, for example, melt-spinning a polymer synthesized from a prepolymer obtained by reacting a polyol and a disocyanate, and preferably based on the total amount of the raw material polyol. 50 mass of polyether polyol. By heat setting a woven or knitted fabric containing a high-fusible polyurethane fibrous fiber containing at least / ₀ and an inelastic fiber, the part where the polyurethane elastic fiber is in contact with the inelastic fiber and the polyurethane elastic fiber are in contact with each other. It was discovered that heat fusion occurred in the part where the material was bent, and that there was no loss in strength, and that a fabric was obtained that was less likely to cause misalignment, ragging, fraying, orchid, densen, curl, slip-in or misalignment It led to the invention.

That is, the present invention provides the following woven / knitted fabric mixed with polyurethane elastic fibers and a method for producing the same.

[I] High fusion with a strong retention of 50% or more after dry heat treatment at 150 ° C for 45 seconds with 100% elongation and a melting point of 180 ° C or less It contains a polyurethane elastic fiber and at least one kind of non-conductive yarn, and is highly fused by dry heat or wet heat setting. A woven or knitted fabric with a mixture of polyurethane elastic fibers obtained by heat-sealing the intersections of urethane elastic fibers and inelastic yarns.

[II] The polyurethane according to [I], further comprising a high-melting-point polyurethane elastic fiber having a melting point of 200 ° C. or more, and wherein the intersection of the high-melting-point polyurethane elastic fiber and the above-mentioned fused polyurethane elastic fiber is heat-fused. Woven and knitted fabric with mixed elastic fibers.

[III] At least one fused polyurethane polyurethane fiber having a strong retention of 50% or more after a dry heat treatment at 150 ° C for 45 seconds in a state of being stretched by 100% and a melting point of 180 ° C or less; After forming a woven or knitted fabric using various types of inelastic yarns, dry or hot heat setting is performed to form a high-fusion polyurethane elastic fiber with each other or at the intersection of the non-elastic yarn and the high-fusion polyurethane elastic fiber. A method for producing a woven or knitted fabric mixed with polyurethane elastic fibers, wherein the intersections with non-elastic yarns are heat-sealed.

[IV] Further, using a high-melting-point polyurethane elastic fiber having a melting point of 200 ° C. or more, the intersection of the high-melting-point polyurethane elastic fiber and the high-fusion polyurethane elastic fiber was heat-fused. PROCESS FOR PRODUCING WOVEN KNITTED MIXED POLYURETHANE ELASTIC FIBER

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is an example of the organization chart of the knitted fabric.

Figure 2 is an example of the organization chart of the knitted fabric.

Figure 3 is an example of an organization chart of a warp knitted fabric.

Figure 4 is an example of an organization chart of a warp knitted fabric.

FIG. 5 is an example of an organization chart of a warp knitted fabric.

FIG. 6 is an example of an organization chart of a warp knitted fabric.

FIG. 7 is an example of an organization chart of a warp knitted fabric.

FIG. 8 is an example of an organization chart of a warp knitted fabric.

FIG. 9 is an example of an organization chart of a warp knitted fabric.

Fig. 10 shows a test specimen for a tensile test of a warp knitted fabric. C Best mode for carrying out the invention Hereinafter, the present invention will be described in more detail.

As long as the polyurethane elastic fiber used in the present invention is easily fused even at a low temperature and has high heat resistance and is a highly fused polyurethane elastic fiber, its composition and production method are not particularly limited. Reacting a polyol with an excess molar amount of diisocyanate to produce a polyurethane intermediate polymer having isocyanate groups at both ends, and a low molecular weight diamine having active hydrogen capable of easily reacting with the isocyanate group of the intermediate polymer. After producing a polyurethane solution (polymer solution) by reacting a low molecular weight diol in an inert organic solvent, the solvent is removed to form a yarn, or a polyol and a diisocyanate are mixed with a low molecular weight diamine or a low molecular weight diol. After solidifying the reacted polymer and dissolving it in a solvent, removing the solvent and forming it into yarn A method in which the solidified polymer is formed into a yarn by heating without dissolving in a solvent; a process in which the polyol, diisocyanate, and low-molecular-weight diol are reacted to obtain a polymer, and the polymer is formed into a yarn without solidification. After the polymer or the polymer solution obtained by each of the above methods is mixed, a solvent is removed from the mixed polymer solution to form a yarn. Among them, particularly, (A) a double-ended isocyanate mono-group prepolymer obtained by reacting a polyol and a di-isocyanate (hereinafter referred to as a “double-ended NCO-group prepolymer”), and (B) a polyol, a diisocyanate and a low molecular weight A method in which a polymer obtained by reacting a diol with a hydroxyl group prepolymer obtained at both ends (hereinafter referred to as “OH group prepolymer at both ends”) without solidifying the polymer is easily fused at a low temperature. It is preferable to obtain highly fused polyurethane elastic fiber having heat resistance and is economical because it does not include recovery of a solvent.

In this case, the polyols constituting the prepolymers of the components (A) and (B) may be the same or different, but a polymer diol having a number average molecular weight of about 800 to 3,000 Preferably, it is used.

Examples of such a polymer diol include polyether glycol, polyester dalericol, and polycarbonate daricol.

Polyether glycols include, for example, those obtained by ring-opening polymerization of cyclic ethers such as ethylene oxide, propylene oxide, and tetrahydrofuran. Ether diole: ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanedio ^ "nore, neopentinole glycolone, 1,6-hexanediol, 3-methyl-1,5- Examples thereof include polyether daricol obtained by polycondensation of glycols such as pentanediol.

Polyester glycols include, for example, ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, neopentinole glycolone, 1,6-hexanediole, and 3-methylinole 1,5-pentanediol. Polyester glycol obtained by polycondensation of at least one selected from dalicols and at least one selected from dibasic acids such as adipic acid, sebacic acid, and azelaic acid; lactones such as prolactatone and valerolactone; Examples thereof include polyester dalicol obtained by ring-opening polymerization of tons.

Examples of the polycarbonate glycol include at least one selected from the group consisting of dialkyl carbonates such as dimethyl carbonate and methyl carbonate; anoalkylene carbonates such as ethylene carbonate and propylene carbonate; and diaryl carbonates such as diphenylenocarbonate and dinaphthyl carbonate. Seeds of organic carbonates, ethylene glycol, propylene dalicol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6_hexanediol, 3-methynole-1,5-pentanediol Examples thereof include carbonate glycol obtained by transesterification with at least one kind of aliphatic diol selected from glue and the like.

The above-mentioned polyether glycol, polyester glycol, or polycarbonate glycol can be used alone or in combination of two or more, but in order to obtain good fusibility, the total amount of It is desirable to use the polyether diol component in an amount of 50% by mass or more, preferably 60% by mass or more, based on the polymer diol, and the polyether diol component may be used in an amount of 100% by mass. As the polyether diol component, polytetramethylene ether glycol is particularly preferably used.

The diisocyanates constituting the prepolymers of the components (A) and (B) include aliphatic, alicyclic, aromatic, and the like generally used in the production of polyurethane. Any disocyanate, such as an araliphatic system, can be used.

Such diisocyanates include, for example, 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 1,5-naphthalene diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate. , Isophorone diisocyanate, 1,6-hexamethylene diisocyanate, ρ-phenylene diisocyanate, 4,4,1-dicyclohexyl methane diisocyanate, methatetramethyl xylene diisocyanate And paratetramethinolexylene diisocyanate. One of these can be used alone or in combination. Among them, 4,4′-diphenylmethanediisocyanate, 4,4 ′ 'Dicyclohexylmethane diisocyanate is preferably used. The low molecular weight diol or low molecular weight diamine which is a chain extender preferably has an appropriate reaction rate and imparts appropriate heat resistance, has two active hydrogen atoms capable of reacting with isocyanate, and generally has a molecular weight of A low molecular weight compound of 500 or less is used.

Such low molecular weight diols include, for example, ethylene glycol, propylene glycol cornole, 1,4-butanediole, 1,5-pentanediole, neopentyl dioliconele, 1,6-hexanedioleone, 3-methyldioleone, 5 _ Aliphatic diols such as pentanediol can be used, and trifunctional glycols such as glycerin can also be used as long as spinnability is not impaired. These can be used alone or in combination of two or more. However, ethylene glycol and 1,4-butanediol are preferred from the viewpoint of workability and imparting appropriate physical properties to the obtained fiber.

Further, as such a low molecular weight diamine, for example, ethylenediamine, butanediamine, propylenediamine, hexamethylenediamine, xylylenediamine, 4,4-diaminodiphenylmethane, hydrazine and the like can be used. Although a low molecular weight diol and a low molecular weight diamine can be used in combination, a low molecular weight diol can be more preferably used as a chain extender in the present invention. Further, as a reaction regulator or a polymerization degree regulator, a monofunctional monoamine such as butanol or the like, or monofunctional amine such as getylamine or dibutylamine may be mixed and used.

The inert solvent used in the polyurethane polymerization reaction or as the spinning solution includes N, N-dimethylformamide, N, N-dimethylacetamide, N, N, N ', N' — Polar solvents such as tetramethylurea, N-methylpyrrolidone and dimethylsulfoxide.

Optional components such as UV absorbers, antioxidants, and light stabilizers may be added to the prepolymers (A) and (B) to improve weather resistance, thermal oxidation resistance, and yellowing resistance. it can.

Examples of UV absorbers include 2- (3,5-di-t-amyl- 12-hydroxyphenyl) benzotriazole, 2- (3_t-butyl_5_methyl_2-hydroxyphenyl) -15-chlorobenzozotriazole, Examples include benzotriazole-based ultraviolet absorbers such as 2- (2-hydroxy-1,3,5-bisphenyl) benzotriazole.

Examples of the antioxidant include 3,9_bis (2_ (3- (3-t-butyl-4-hydroxy-15-methylphenyl) -propio-loxy) -1,1,1-dimethylethyl) 1,2,4 , 8,10-Tetraoxaspiro (5.5) pentane, 1,3,5-tris (4-t-butyl-3, hydroxy-2,6-dimethinolevenyl) isocyanuric acid, pentaerythryl-tetrakis [ And hindered phenolic antioxidants such as 3- (3,5-di-t-butyl-1-4-hydroxyphenyl) propionate].

Examples of light stabilizers include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-14-piperidyl) sebacate, Examples include hindered amine photo stabilizers such as dimethyl succinate-11- (2-hydroxyethynole)-4-hydroxy-1,2,2,6,6-tetramethylpiperidine condensate.

Next, the method for obtaining the polyurethane elastic fiber of the present invention is not particularly limited. For example, the following three methods are known as a melt spinning method. (1) A method of melt-spinning a polyurethane elastic chip.

(2) A method in which a polyurethane elastic chip is melted and then mixed with a polyisocyanate compound and spun.

(3) A reaction spinning method of synthesizing a spinning polymer obtained by reacting a prepolymer obtained by reacting a polyol with a diisocyanate and a low molecular weight diol, and then spinning the solid without solidification.

The method of (3) is simpler than the methods of (1) and (2) because there is no process for handling the polyurethane elastic chip, and the spinning rate is adjusted by adjusting the injection ratio of the prepolymer to the reactor. This is a preferable method because the amount of residual NCO groups in the polyurethane elastic fiber can be adjusted, and the heat resistance can be improved by a chain extension reaction by the residual NCO groups. Furthermore, in the method (3), as disclosed in Japanese Patent Publication No. 11-8339030, a low-molecular-weight diol is reacted in advance with a part of the prepolymer, and the OH group-excess prepolymer is supplied to the reactor. An injection method can also be used.

According to the method (3), the polyurethane elastic fiber of the present invention is prepared by continuously and quantitatively injecting the prepolymers of the components (A) and (B) into a reactor and melting the obtained polymer for spinning without solidifying. It is particularly preferred to obtain by spinning.

In this case, the synthesis of the polymer for spinning is carried out by (I) synthesis of a prepolymer having N-terminal NCO groups, (II) synthesis of prepolymers having OH groups at both ends, and (III) introduction of these two prepolymers into a reactor. It is composed of three reactions, ie, the synthesis of a spinning polymer that is continuously reacted. The composition ratio of the raw materials is the sum of the above three reactions, and the molar amount of all diisocyanates, total polymer diol and total low The molar ratio to the total molar amount of the molecular weight diol is preferably from 1.02 to 1.20.

Specifically, the above-mentioned N-terminal NCO-based prepolymer of (I) is prepared, for example, by charging a predetermined amount of diisocyanate into a tank equipped with a hot water jacket and a stirrer, and then stirring the predetermined amount of polymer diol while stirring. It can be obtained by pouring and stirring at 80 for 1 hour under a nitrogen purge. The NCO-based prepolymer at both ends obtained by this reaction is injected into a polyurethane elastic fiber reactor using a jacketed gear pump (for example, KAP-1 manufactured by Kawasaki Heavy Industries, Ltd.). The prepolymer of OH group at both ends of (II) is prepared by charging a predetermined amount of diisocyanate into a tank equipped with a warm water jacket and a stirrer, then injecting a predetermined amount of polymer diol with stirring, and adding the mixture at 80 ° C. It can be obtained by stirring under a nitrogen purge for a period of time to obtain a precursor, and then injecting a low molecular weight diol and stirring to react with the precursor. The obtained prepolymer at both ends is injected into a polyurethane elastic fiber reactor using a jacketed gear pump (for example, KAP-1 manufactured by Kawasaki Heavy Industries, Ltd.).

During the synthesis of both prepolymers, the above-mentioned various chemicals for improving weather resistance, thermal oxidation resistance, yellowing resistance, etc. can be added.

The spinning polymer (III) can be synthesized by continuously reacting the prepolymers (A) and (B) fed at a fixed ratio. In this case, the reactor used may be any of those used in the ordinary melt spinning of polyurethane fiber, and the reaction is provided with a mechanism for heating, stirring and reacting the spinning polymer in a molten state, and further transferring the polymer to the spinning head. Machine is preferred. The reaction conditions are 1 to 90 minutes at 160 to 220 ° C, preferably 3 to 80 minutes at 180 to 210 ° C.

The polyurethane elastic fiber of the present invention can be obtained by transferring the synthesized polymer for spinning to a spinning head without solidifying, discharging from a nozzle, and spinning. The average residence time depends on the type of reactor and is calculated by the following formula.

Average residence time in reactor =

(Reactor volume / amount of polymer discharged for spinning) X Specific gravity of polymer for spinning Generally, it takes about 1 hour when using a cylindrical reactor and 5 to 10 minutes when using a twin-screw extruder. The spinning temperature is 180 to 230 ° C. It can be obtained by continuously extruding through a nozzle, cooling, applying a spinning oil and winding it up. The ratio between the polymer and the OH group prepolymer at both ends is determined by adjusting the injection gear pump so that the NCO group remains in the yarn immediately after spinning in an amount of 0.3 to 1% by mass, more preferably 0.35 to 0.85% by mass. It is preferable to adjust the rotation ratio appropriately. If 1 ^ 〇0 groups are contained in excess of 0.3% by mass, chain extension reaction after spinning Thereby, physical properties such as high elongation and heat resistance can be improved. If the NCO group content is less than 0.3% by mass, the resulting polyurethane elastic fiber may have a reduced heat and strength retention rate. If the NCO group content exceeds 1% by mass, the viscosity of the spinning polymer decreases, In some cases, spinning becomes difficult.

The content of NCO groups in the spun fibers is measured as follows.

After dissolving the spun fiber (about 1 g) with a dibutylamine / dimethylformamide / toluene solution, excess dibutylamine is reacted with the NCO group in the sample, and the remaining dibutylamine is titrated with hydrochloric acid, and the NCO group is titrated. Is calculated.

As described above, the polyurethane elastic fiber used in the present invention is particularly preferably a polyurethane elastic fiber produced by melt reaction spinning using polyetherdiol as a main raw material.

The polyurethane elastic fiber used in the present invention has a tenacity retention of 50% or more, preferably 55% or more after being subjected to dry heat treatment at 150 ° C. for 45 seconds in a 100% stretched state. If the strength retention is lower than 50%, the elasticity of the product after heat setting is undesirably reduced.

The upper limit of the strength retention is not particularly limited, but is usually 90% or less, particularly 80% or less.

Further, the melting point of the polyurethane elastic fiber is at most 180 ° C, preferably at most 175 ° C. If the temperature is higher than 180 ° C, the heat treatment temperature for fusing becomes too high, which adversely affects the texture of the product and the color fastness, which is not preferable.

The lower limit of the melting point should be 150 ° C or higher, and especially 150 ° C or higher, in terms of dimensional stability when mixed with high-melting polyurethane elastic fiber and elongation recovery of fabric. This is preferred.

The method for measuring the strength retention is as described below.

The woven or knitted fabric mixed with polyurethane elastic fiber of the present invention uses the above-mentioned high-fusing polyurethane fiber and inelastic yarn, and further contains, for example, a high-melting polyurethane elastic fiber having a melting point of 200 ° C. or more. Having the following structure.

(1) A woven fabric using a composite yarn containing a highly fused polyurethane elastic fiber and at least one type of inelastic yarn as a warp and a Z or weft. The organization is plain weave, twill weave, satin weave, etc. However, shuttle looms, levier looms, air jet looms, and the like can be used as looms. Further, the warp and the weft may all be the composite yarn, or the composite yarn and the non-resilient "raw yarn" may be mixed and used at a driving ratio of 1: 1, 1: 2 or 1: 3.

(2) A weft knitted fabric in which highly fused polyurethane elastic fibers and at least one or more inelastic yarns are mixed in the same course of a knitting machine. The knitting structure of the weft knitted fabric in which the high fusion polyurethane elastic fiber and inelastic yarn are knitted can be any of flat knitting, rubber knitting, pearl knitting, double-sided knitting, or a combination or change of these. Knitting machines can be used, and all knitting machines such as circular knitting machines, flat knitting machines, full fashion knitting machines, and sock knitting machines can be used. The high fusion polyurethane elastic fiber may be either braided or braided. Further, plating knitting of high fusion polyurethane elastic fiber and inelastic yarn may be used, or composite yarn of high fusion polyurethane and inelastic yarn may be used. As in (1), a high fusion polyurethane elastic fiber may be knitted in all courses, or may be knitted in every other course or more. High-fusing polyurethane elastic fibers and inelastic yarns may be alternately or knitted at appropriate intervals. Further, a high melting point polyurethane elastic fiber may be mixed. An example is shown below, but the present invention is not limited to this.

(2) _ 1 Example of all courses:

1st high fusion yarn and inelastic yarn, or composite yarn

2nd high fusion yarn and inelastic yarn, or composite yarn

3rd high fusion and inelastic yarns or composite yarns

4th high fusion yarn and inelastic yarn, or composite yarn

(2)-2 Every other course:

1st high fusion yarn and inelastic yarn, or composite yarn

2nd non-woven yarn

3rd High-fused yarn and non-abrasive yarn or composite yarn

4th inelastic yarn

(2) —3 Example of using high fusion yarn and high melting point yarn every other course:

(1) High self-fusing yarn and inelastic yarn, or composite yarn

2nd high melting point yarn and inelastic yarn, or composite yarn 3rd high fusion yarn and inelastic yarn, or composite yarn

4th high melting point yarn and inelastic yarn, or composite yarn

(2)-4 alternating examples:

1 st 髙 Fused yarn

2nd non- 弹 "raw silk, or high fusion yarn and non-elastic 1 ~ raw silk

3rd high fusion yarn

4th inelastic yarn, or high fusion yarn and inelastic yarn

(3) A warp knitted fabric in which highly fused poly-urethane elastic fibers and at least one or more inelastic yarns are mixed. The knitting structure of the warp knitted fabric in which the high-fusing polyurethane elastic fiber and the inelastic yarn are knitted can be any structure such as a knitting knit, a denbi knitting, a cord knitting, an atlas knitting, or a combination of these or a structure changed. Knitting machines can be used, and all knitting machines such as tricot knitting machines, Raschel knitting machines, and Miranese knitting machines can be used. As in (1), a high fusion polyurethane elastic fiber may be woven over the entire surface, or may be woven at appropriate intervals. Further, the high fusion polyurethane elastic fiber may be either imported or knitted. Further, a high melting point polyurethane elastic fiber may be mixed. An example is shown below, but the present invention is not limited to this.

(3) -1 knitted fabric

FIG. 1 and FIG. 2 show wedge yarns that are often used for lace ground and the like. This sari tissue is liable to have defects such as run and unravel after cut sewing. As a countermeasure, a run-stopping tissue has been proposed, but traces of the run-stopping tissue remain dirty on the fabric, leaving a problem of hindering luxury. Therefore, in FIGS. 1 and 2, a is a non-elastic raw silk, and b is a braided heat set as a high fusion polyurethane elastic fiber of the present invention, or a high melting polyurethane elastic fiber and high melting polyurethane elastic fiber are aligned. Then, in section X shown in Fig. 1, the high fusion polyurethane elastic fiber and the non-elastic yarn, and the high fusion polyurethane elastic fiber and the high melting point polyurethane resin come into contact with each other and thermally fuse, and the elongation recovery property is improved. It is possible to obtain a knitted fabric that is good, prevents defects such as run-out, and does not impair the aesthetics at all.

(3) — 2 Knitted fabrics other than kari

Even in the case of a tissue generally used other than the stiff tissue, the highly fused polyurethane of the present invention can be used. When the non-woven fibers are inserted or braided, they become less likely to be soft (displacement, slip-off, pop-out) due to fusion with the inelastic yarn and further fusion between the polyurethane elastic fibers. The durability of the fabric can be significantly improved. Also, the fabric is more stable, curling is less likely to occur, and cost reduction during sewing can be expected.

For example, in the organization charts shown in Figs. 3 to 8, by appropriately using high-fusing polyurethane elastic fibers, it is possible to obtain a knitted fabric in which misalignment, softness, fraying, orchid, densen, curling, and slipping do not easily occur. It becomes possible.

In FIG. 3, L 1 and L 2 are the entire import (A 11 1 -in), L 1 and L 2, L 3 and L 4 in FIG. 4 are every other insert (lin_lout), L l, L 2, and L 3 in Figs. 5 to 8 are the total import (A l 1-in). In addition, a in FIGS. 3 to 8 is a non-elastic yarn, b is a high fusion polyurethane elastic fiber of the present invention used alone or in alignment with a high melting point polyurethane elastic fiber, and c in FIGS. Force of Using Two High-Fusion Polyurethane Elastic Fibers of the Invention One high-fusion polyurethane elastic fiber and one high-melting polyurethane elastic fiber of the present invention can be used.

In addition, depending on the intended use, when the cut end is used without any sewing, there has been a problem with durability such as fraying due to rubbing during washing or wearing, but this can be greatly improved. .

Here, there is no particular limitation on the inelastic yarn to be mixed with the high-fusible polyurethane elastic fiber, and for example, natural fibers such as cotton, hemp, wool, and silk, and recycled fibers such as rayon, cuvula, and polynosic. Fibers such as semi-regenerated fibers such as acetate and chemically synthetic fibers such as nylon, polyester and acrylic can be used, and the mixing ratio of polyurethane elastic fibers is preferably about 1 to 40%.

Further, in the woven or knitted fabric mixed with polyurethane elastic fibers of the present invention, 200 ° C. or more, preferably 210 ° C., which is excellent in heat resistance and elastic recovery by a dry spinning method in which a chain length reaction is performed with diamine, is preferred. By mixing and using a high-melting polyurethane elastic fiber having a melting point of C or higher, it is possible to obtain a woven or knitted fabric having good elasticity while maintaining the fusibility. In this case, the amount of the high-melting polyurethane fiber used is preferably about 2 to 40%. Here, the dry heat setting method can be performed by using a setting machine such as a pin tenter and heat-fixing with hot air. In this case, the set temperature should be 140 to 200 ° C, especially 170 to 190 ° C, and the set time should be 10 seconds to 3 minutes, especially 30 seconds to 2 minutes. it can.

On the other hand, the moist heat setting method can be performed by heat setting with saturated steam at a predetermined pressure in a state where a knitted fabric or the like is placed in a template. In this case, the set temperature is 100 to 130 ° (particularly, 105 to 125 ° C.), and the set time can be 2 to 60 seconds, particularly 5 to 30 seconds.

ADVANTAGE OF THE INVENTION According to this invention, it can process at low set temperature, and can obtain the woven-knitted fabric mixed with polyurethane elastic fiber which is hard to generate misalignment, rag, fraying, run, force, slip-in and misalignment.

Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In the following examples, all parts are parts by mass.

(Example 1)

As raw materials for synthesizing polyurethane elastic fibers, the following prepolymers having a terminal group of N C〇 and a pre-polymer group having a terminal group of H were synthesized.

Synthesis of prepolymers with both terminal OH groups

As a diisocyanate, 4,4'-diphenylmethane diisocyanate (hereinafter referred to as MDI) 25 parts were charged into a reaction vessel equipped with a warm water jacket at 80 ° C sealed with nitrogen gas. 100 parts of polytetramethylene ether glycolone having a number average molecular weight of 2,000 (hereinafter referred to as PTMG) was injected with stirring. After the reaction for 1 hour, 27.6 parts of 1,4-butanediol was further injected as a low-molecular-weight diol to synthesize a prepolymer of both terminal OH groups.

Synthesis of prepolymers with N C〇 groups at both ends

47.4 parts of MDI was charged as a diisocyanate into a reaction vessel at 80 ° C sealed with nitrogen gas, and an ultraviolet absorber (2- (3,5-di-amyl-2-hydroxyphenyl) benzotriazole: 2 0%), antioxidant (3,9-bis (2- 3- (3-t-butynole 4-hydroxy-5-methinolephenone) 1-propio-noleoxy) 1,1,1-dimethylethyl) 1,2,4,8,10-tetraoxaspiro

A mixture of (5.5) dendecane: 50%) and a light stabilizer (bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate: 30%) 2. Add 2 parts of polymer diol with stirring. As a result, 100 parts of PTMG having a number average molecular weight of 2,000 was injected, and stirring was continued for 1 hour to obtain a prepolymer of NC〇 group at both ends.

The obtained two-terminal NCO group prepolymer and the two-terminal OH group prepolymer were mixed in a ratio of 1: 0.

At a mass ratio of 475, it was continuously supplied to a cylindrical reactor for polyurethane elastic fibers with a capacity of 2,200 m1 and a stirring blade. The feed rate was 28.93 gZ for the N pre-polymer at both ends and 13.74 g / min for the OH pre-polymer at both ends. The average residence time in the reactor was about 1 hour, and the reaction temperature was about 190 ° C.

Without solidification, the obtained polymer was introduced into two 8-nozzle spinning heads maintained at a temperature of 192 ° C. The spinning polymer is weighed and pressurized by a gear pump installed on the head, filtered through a filter, and then through a 0.6 mm diameter, 1 hole nozzle at a speed of 2.67 g / min into a 6 m long spinning cylinder. (Total amount discharged from the nozzle:

42. 67 gZ) While applying the oil, the film was wound at a speed of 600 m / min to obtain a polyurethane elastic fiber of 44 decitex.

The NCO group content of the polyurethane elastic fiber immediately after ejection was 0.42% by mass.

. The physical properties of this polyurethane elastic fiber were measured by the methods described below. As a result, the melting point was 168 ° C. and the heat retention strength was 65%. Further, a knitted fabric was prepared using the elastic fiber by the following method, and the knitting tension of the knitted fabric after heat setting was measured. The results are shown in Table 1.

Melting point measurement method

Measuring device: TMA (thermal equipment measuring device)

Uses quartz probe

Grasp length: 20 mm

Elongation: 0.5%

Temperature range: room temperature to 250 ° C

Heating rate: 20 ° C / min Evaluation: The temperature when the thermal stress became 0 mgf was defined as the melting point.

How to measure heat retention

The polyurethane elastic fiber is held at a grip length of 10 cm and stretched to 20 cm. In the stretched state, it was placed in a hot air drier maintained at 150 ° C. for 45 seconds to perform heat treatment. The tenacity of the polyurethane elastic fiber after the heat treatment was measured using a tensile tester with a constant elongation speed at a grip length of 5 cm and an elongation speed of 50 O mmZ. The environment at the time of measurement was a temperature of 20 ° C and a relative humidity of 65%. Shows the heat and strength retention of the fiber before heat treatment.

Creating knitted fabric

Yarn feeder 2 and 4 of the pantyhose knitting machine (manufactured by Ronati Co., Ltd., number of stitches: 400), 6 nylon filaments, 13 decitex, 7 filaments, and 1 and 3 polyester yarns Was performed.

Heat set

The prepared knitted fabric was subjected to dry heat treatment for 1 minute in a dryer maintained at 160 ° C. and 180 ° C.

Measurement of the unwinding tension

The knitting tension of the knitted yarn and polyurethane elastic fiber from the knitted fabric was measured. The disassembly speed was set to 100 mmZ minutes, and the average tension for one minute was calculated. (Example 2)

A polyurethane elastic fiber using polyester diol was produced in the same manner as in Example 1 except that polyethylene glycol adiate having a number average molecular weight of 2,000 was used instead of PTMG. The NCO group content of the polyurethane elastic fiber immediately after the ejection was 0.45% by mass. The physical properties were measured in the same manner as in Example 1. As a result, the melting point of the 44 decitex polyurethane elastic fiber was 170 ° C., and the retention of heat and strength was 62%.

Using this elastic fiber, a knitted fabric was prepared in the same manner as in Example 1, and the knitting tension of the knitted fabric after heat setting was measured. Table 1 shows the results. (Comparative Example 1)

44 decitex polyurethane elastic fiber (Mobilon P-type yarn manufactured by Nisshinbo Industries Inc.) using PTMG as the polymer diol and diamine as the chain extender was used. The physical properties were measured in the same manner as in Example 1. As a result, the polyurethane elastic fiber had a melting point of 22 ° C. and a heat retention strength of 95%.

Using this elastic fiber, a knitted fabric was prepared in the same manner as in Example 1, and the knitting tension of the knitted fabric after heat setting was measured. Table 1 shows the results.

(Comparative Example 2)

A spinning polymer was synthesized in the same manner as in Example 1, extruded from an reactor into a strand through an orifice having a diameter of 4 mm, cooled, and cut to obtain a polyurethane bullet-fe body pellet. The pellets were dried in a vacuum drier, melted again in a single screw extruder, weighed and pressurized by a gear pump installed in the spinning head in the same manner as in Example 1, filtered through a filter, and filtered to a diameter of 0.6 mm. Discharge from a 1-hole nozzle at a rate of 2.67 g per minute into a 6 m long spinning cylinder (total discharge from the nozzle: 42.67 g Z minute), and apply 60 g while applying oil. Winding was performed at a speed of 0 m / min to obtain a polyurethane elastic fiber of 44 dtex. The NCO group content of the polyurethane elastic fiber immediately after ejection was 0.13% by mass.

The physical properties were measured in the same manner as in Example 1. As a result, the polyurethane elastic fiber had a melting point of 152 ° C. and a heat-resistant tenacity retention of 38%. A knitted fabric was prepared using this fusible fiber in the same manner as in Example 1, and the knitting tension of the knitted fabric after heat setting was measured. The results are shown in Table 1. table 1

Knitting tension from knitted fabric (c N)

In Examples 1 and 2, the deknitting tension was high due to fusion, and in the case of the polyurethane elastic fiber using polyetherdiol of Example 1, the deknitting tension was particularly high. Further, in both Examples 1 and 2, even in the heat set at 180 ° C., the viscous fibers in the knitted fabric did not break. In the case of the combination with the high-melting-point polyurethane elastic fiber of Comparative Example 1, fusion hardly occurs.In Comparative Example 2, the knitting tension by the heat setting at 160 ° C is high, but in the knitted fabric by the heat setting at 180 ° C. Polyurethane elastic fiber breaks. (Example 3)

Using the polyurethane elastic fiber obtained in Example 1, a knitted fabric prepared by the following method was heat-set, and a washing test was performed. Fraying, slip-in, and a knitted ground of the knitted fabric were visually observed. Table 2 shows the results.

Creating knitted fabric

6-Nye-opening flammable yarn Z twisted 3 3 decitex 10 filaments in the yarn feeder 1 and 3 of the pantyhose knitting machine (manufactured by Lonati, 400 stitches), 6-nylon temporary in 2 and 4 holes Twisted yarn S-twisted 33 decitex 10 filaments, and furthermore polyurethane-fibers were supplied to all 4 ports, and a knitted fabric was formed by plating knitting. The weaving magnification was set to 2.5 times.

Heat set

The prepared knitted fabric was subjected to dry heat treatment for 1 minute in a dryer maintained at 180 ° C. A 15 x 20 cm cut sample was created from the knitted fabric after setting, and Suga Test Machine Co., Ltd. The washing was repeated 20 times using an LM-160 washing tester.

Liquid volume: 150 ml

Use 10 steel balls

Temperature: 50 ° C

Time: 1 cycle 30 minutes

Evaluation method

Fraying: The end of the knitted fabric pressed in parallel with the course direction of the knitted fabric was observed.

Slip-in: The end of the knitted fabric pressed in the direction of the knitted fabric was observed, and evaluated by the ratio (%) of the number of elastic fibers slipping in by 5 mm or more from the knitted fabric edge.

Misalignment: The degree of smoothness of the knitted fabric was observed.

Curl: The edge of the knitted fabric was observed.

(Example 4)

Using the same knitting machine as in Example 3, the polyurethane elastic fiber of Example 1 was supplied to the first and third ports, and the viscous fiber of Comparative Example 1 was supplied to the second and fourth ports to form a knitted fabric in the same manner as in Example 3. A test similar to that of Example 3 was performed. Table 2 shows the results.

(Comparative Example 3)

A knitted fabric was made in the same manner as in Example 3 using only the elastic fiber of Comparative Example 1, and a similar test was performed. Table 2 shows the results.

(Comparative Example 4)

A knitted fabric was made in the same manner as in Example 3 using only the elastic fiber of Comparative Example 2, and a similar test was performed. Table 2 shows the results. Table 2

In Comparative Example 4, yarn breakage of the polyelastic fiber occurred in the knitted fabric. (Example 5)

In the same manner as in Example 1, a polyurethane elastic fiber of 156 dtex was obtained. The physical properties were measured in the same manner as in Example 1. As a result, the melting point of the polyurethane elastic fiber was 170 ° C., and the heat-resistant tenacity retention was 68%. Further, a warp knitted fabric was prepared by using the elastic fiber by the following method, and the pull-out resistance value of the polyurethane elastic fiber was measured from the knitted fabric after the heat setting. Table 3 shows the results.

Creating knitted fabric

Using a Raschel knitting machine (manufactured by Carl Mya, 28 gauge), 6-nylon filament yarn 56 decitex 17 filament is used for L 1 a and L 3 c in FIG. 9 and polyurethane elastic fiber is used for L 2 b in FIG. Was used to create a warp knitted fabric.

Heat set

The above knitted fabric was subjected to dry heat treatment for 1 minute in a dryer maintained at 190 ° C.

Measurement of pull-out resistance

From the knitted fabric, a test piece having a weft direction (width) of 25 mm and a meridian direction (length) of 10 O mm as shown in FIG. 10 was sampled. At this time, a total of 10 test pieces were collected for each of the five test pieces so that the drawing direction of the polyurethane elastic fiber was the knitting start and knitting end directions.

Subsequently, test pieces were prepared as shown in FIG. The test piece was cut at a position (Β-Β ') 40 mm from the lower end (D-D') of the test piece while leaving one polyurethane elastic fiber 1 inserted in the warp direction. Next, the remaining polyurethane elastic fiber is Then, it was taken out from the test piece by 5 mm (E-F) toward the direction of the upper grip 2. Further, a cut 3 having a width of 3 mm was made in the weft direction on the extension line of the polyurethane elastic fiber and at a position of 3 O mm from the upper end of the test piece.

When measuring the pull-out resistance with a tensile tester, adjust the gripping distance of the tensile tester to 40 mm, and then test using the upper gripping margin of 25 mm (above Α _ Α ') of the test piece. Grasp the upper part, apply an initial load of 0.1 cN to the polyurethane elastic fiber, grasp the polyurethane elastic fiber with a lower gripping margin of 35 mm (below C-C '), and determine the tensile speed. It was pulled at 0 mm / min, and the maximum pulling load until the polyurethane elastic fiber was pulled out was measured. The procedure was repeated 10 times in each of the knitting start and end directions, a total of 10 times, and the average value was calculated to determine the pull-out resistance value.

(Comparative Example 5)

Polyurethane elastic fiber of 156 decitex using PTMG as polymer diol and diamine as chain extender (Mobilon P type yarn, manufactured by Nisshinbo Industries, Ltd., melting point: 21.7 ° C, retention of heat resistance 93% ) Was used as a warp knitted fabric in L2b of FIG. 9 to prepare a warp knitted fabric in the same manner as in Example 5. After the heat setting, the pull-out resistance value of the L2 b yarn was measured in the same manner as in Example 5. Table 3 shows the results.

(Example 6)

Using the same knitting machine as in Example 5, using 6-nylon filament yarn 56 decitex 17 filament for L 1 a in FIG. 3 and using the polyurethane elastic fiber of Example 5 for L 2 b. A warp knitted fabric was prepared, and the same test as in Example 5 was performed. Table 3 shows the results.

(Comparative Example 6)

A knitted fabric was prepared in the same manner as in Example 6, except that the same elastic fiber as that in Comparative Example 5 was used for L2b in FIG. 3, and a similar test was performed. Table 3 shows the results. (Example 7)

Using the same knitting machine as in Example 5, a 6-nylon filament yarn 56 decitex 17 filament is used for a of L1 and L2 in FIG. 4 and the polyurethane of Example 5 is used for b of L3 and L4. A warp knitted fabric was prepared using elastic fibers, and the same test as in Example 5 was performed. Table 3 shows the results.

(Comparative Example 7)

A warp knitted fabric was prepared in the same manner as in Example 7 except that the elastic fiber of Comparative Example 5 was used for L3 and L4b in FIG. 4, and the same test was performed. Table 3 shows the results.

Table 3

Pullout resistance measurement result

In Examples 5 and 7, the pull-out resistance value was increased due to fusion, and in Example 6, the knitted fabric was fused to such an extent that it was not pulled out, and was less likely to cause misalignment and softness. In the combination with the high-melting-point polyurethane elastic fibers of Comparative Examples 5, 6, and 7, fusion was unlikely to occur, the pull-out resistance was low, and misalignment and softness occurred.

(Example 8)

Create a knitted fabric by the following method, heat set, measure the knitting tension of the knitted fabric, check the fusion state between the polyurethane elastic fibers, and damage the knitted fabric by washing test (washing durability) Was visually evaluated. Table 4 shows the results.

Creating knitted fabric

Using a Raschel knitting machine (manufactured by Carl Myer, 28 gauge), the set shown in Fig. 5 was used. The knitted fabric of the woven diagram was created. In FIG. 5, 6-nylon filament yarn 56 a decitex 17 filament is used for a of L 1, the same elastic fiber as Comparative Example 5 is used for c of L 2, and the polyurethane elastic fiber of Example 1 is used for c of L 3 Then, the warp knitted fabric was knitted into the main knitted fabric. Further, a warp knitted fabric was prepared using nylon filament yarn 110 decitex 24 filaments as a yarn to be removed between the main knitted fabrics.

Heat set

Measurement of the unwinding tension

The deknitting tension of the drawn nylon yarn was measured. The unpacking speed was 10 O mm / min, the unpacking tension for 1 minute was measured, and the average value at five peak points was calculated.

Check fusion status

The nylon yarn of the main knitted fabric was dissolved with 20% dilute hydrochloric acid, and the state of fusion at the contact portion between the polyurethane elastic fibers was observed. Preparation of Samples for Knitted Fabric Damage Evaluation

Cut a strip sample of 3.3 cm in length and 24.0 cm in width with respect to the knitting direction of the heat-set knitted fabric, and cut it at an angle of 40 degrees with respect to the knitting direction from the cut surface in the weft direction. Then, it was divided into the “knitting start side” and the “knitting end side”, and the cut portions in the vertical direction were aligned and sewed with an over-open sewing machine to create a ring-shaped sample. Washing of samples in the evaluation of knitted fabric damage

The prepared sample was washed continuously for 300 minutes under the following conditions.

Household two-tub washing machine

Adjust to 1.3 g / L (weak detergent)

Water volume: 30 L

Load cloth: bare fabric knitted fabric mixed with cotton and polyurethane / raw fiber, 1.0 kg knitted fabric damage evaluation

Observe the degree of damage to the cut part of the “knitting start side” and “knitting end side”, and It was evaluated on a scale.

◎: No damage is observed

〇: Some damage is observed

Δ: Scratch is observed

X: severe damage

Of these, Δ and X are damages to the extent that hesitate to wear them as clothing, and ◎ to 好ましい are preferred in terms of washing durability.

(Comparative Example 8)

A warp knitted fabric was prepared in the same manner as in Example 8, except that the elastic fiber of Comparative Example 1 was used for c of L3 in FIG. After the heat setting, the unknitting tension of the drawn yarn was measured, the state of fusion of the polyurethane elastic fiber was confirmed, and the same test as in Example 8 was performed. Table 4 shows the results.

(Example 9)

Using a knitting machine similar to that of Example 8, 6-nylon filament yarn 56 decitex 17 filament is used for L 1 a in FIG. 6, polyurethane polyurethane fiber of Comparative Example 1 is used for L 2 c and L 3 A warp knitted fabric was prepared using the polyurethane elastic fiber of Example 1 in c, and the same test as in Example 8 was performed. Table 4 shows the results. (Comparative Example 9)

A warp knitted fabric was prepared in the same manner as in Example 9 except that the elastic fiber of Comparative Example 1 was used for c of L3 in FIG. 6, and a similar test was performed. Table 4 shows the results.

(Example 10)

Using the same knitting machine as in Example 8, using 6-nylon filament yarn 56 decitex 17 filament for L 1 a in FIG. 7 and using the polyurethane elastic fiber of Example 1 for L 2 b, A warp knitted fabric was prepared without using the thread, and the same test as in Example 8 was performed. Table 4 shows the results. (Comparative Example 10)

A warp knitted fabric was prepared in the same manner as in Example 10 except that the elastic fiber of Comparative Example 1 was used for L2b in FIG. 7, and the same test was performed. Table 4 shows the results.

(Example 11)

Using the same knitting machine as in Example 8, using 6-nylon filament yarn 56 decitex 17 filament for L 1 a in FIG. 8 and using the polyurethane elastic fiber of Example 1 for L 2 b, A warp knitted fabric was prepared without using the thread, and the same test as in Example 8 was performed. Table 4 shows the results. .

(Comparative Example 11)

A knitted fabric was prepared in the same manner as in Example 11 except that the elastic fiber of Comparative Example 1 was used for L2b in FIG. 8, and a similar test was performed. Table 4 shows the results. Table 4

Evaluation of the unsealing tension and the fusion state between the elastic fibers, and the evaluation result of the damage of the cut part.

(cN) Knitting start Knitting end side

Non-peelable

Male 8 8 .6 〇〇

Peeled off

Comparison row 8 7.2 X X

Fujio small

Non-peelable

Narrow row 9 1 2 .0 〇〇

Peeled off

9 4.8

Oki small △ △

Non-peelable

Male example 1 0 〇〇

Rise

Peeled off

Comparative Example 10 X X

Rise I ¹

Non-peelable

Male example 1 1 ◎ 〇

Peeled off

Ratio 1 1 Δ Δ

Awake small In Examples 8 and 9, the unraveling tension of the drawn yarn was increased, indicating that the drawn yarn and the highly fused polyurethane elastic fiber were strongly fused. Comparative Examples 8 and 9 show that the unraveling tension of the drawn yarn was low, and that fusion with the high-melting polyurethane fiber was unlikely to occur. Regarding the state of fusion between the polyurethane elastic fibers, in Examples 8 and 9, the high-fusion polyurethane elastic fibers and the high-melting-point polyurethane elastic fibers were completely fused, and they were peeled even when the contact portion was pulled. Could not be done. The fusion was weak between the high melting point polyurethane elastic fibers of Comparative Examples 8 and 9, and the contact portion was separated when the contact portion was pulled. In Examples 10 and 11, the highly fused polyurethane elastic fibers were completely fused to each other, and the fused portion could not be peeled off. In Comparative Examples 10 and 11, the fusion between the high-melting-point polyurethane elastic fibers was weak, and they could be peeled off.

Regarding the degree of damage to the knitted fabric due to washing, in Examples 8, 9, 10, and 11 where heat fusion was advanced using highly fused polyurethane elastic fiber, the "knitting start side" and "knitting end side" Both the cut portions were ◎ or 〇, which was a favorable result in terms of washing durability. Comparative examples 8, 9, 10, and 11 using high-melting polyurethane elastic fiber and weak heat fusion Both of the cut sections at the “knitting start side” and “knitting end side” become “△” or “X”. Severe damage that hesitated to wear occurred, which was unfavorable

Even with a stiff tissue or a tissue generally used other than a stiff tissue (insertion or braiding of elastic fibers), if the highly fused polyurethane elastic fiber of the present invention is used, fusion with a non-elastic yarn, and furthermore, polyurethane elastic fiber Due to the mutual fusion, misalignment, softness, fraying, orchid, densen, curling and slip-in hardly occur, and the durability of the fabric has been substantially improved. Also, the cut end was difficult to be frayed or damaged by washing.

Claims

The scope of the claims

1.100. /. A high-fusible polyurethane fiber having a strong retention of 50% or more after a dry heat treatment at 150 ° C. for 45 seconds in an extended state and a melting point of 180 ° C. or less; A woven or knitted fabric comprising a mixture of polyurethane elastic fibers, wherein the fusion-bonded polyurethane elastic fibers or the intersections between the elastic fibers and the non-elastic yarns are heat-sealed by dry heat or wet heat setting.

2. The method according to claim 1, further comprising a high-melting polyurethane elastic fiber having a melting point of 200 ° C. or more, wherein an intersection of the high-melting polyurethane elastic fiber and the high-fusion polyurethane elastic fiber is heat-sealed. The woven or knitted fabric mixed with polyurethane elastic fibers described in the above.

3. Highly fused polyurethane elastic fiber is obtained by reacting (A) a polyol with diisocyanate at both ends of a prepolymer, and (B) a hydroxyl group at both ends obtained by reacting a polyol, diisocyanate and a low molecular weight diol. The polyurethane elastic fiber mixed woven fabric according to claim 1 or 2, wherein the polymer obtained by reacting with the prepolymer is melt-spun, and the raw material polyol contains 50% by mass or more of a polyether polyol. knitting.

4. A high-fusion polyurethane having a strong retention of 50% or more after dry heat treatment at 150 ° C for 45 seconds in a state of being stretched by 100% and a melting point of 180 ° C or less. After forming a woven or knitted fabric using elastic fibers and at least one type of non-elastic yarn, heat-sealing the highly fused polyurethane elastic fibers or the intersections between them and the non-elastic yarn by dry heat or wet heat setting A method for producing a woven or knitted fabric mixed with polyurethane-based fibers.

5. An intersection of the high-melting polyurethane elastic fiber and the high-fusing polyurethane elastic fiber is heat-sealed using a high-melting polyurethane elastic fiber having a melting point of 200 ° C. or more. A method for producing a woven or knitted fabric mixed with polyurethane elastic fibers as described above.