JPH04146235A - Woven and knit fabric having excellent flexural resilience - Google Patents

Abstract

PURPOSE:To provide the subject woven and knit fabric having excellent crease recovery, durability, etc., by subjecting a woven and knit fabric to a thermal treatment at a specific temperature to fuse a part of fiber-interlacing points, the woven and knit fabric comprising polyester fiber and polyester conjugate fiber having a specific thermoplastic elastomer on the surface of each fiber. CONSTITUTION:A woven and knit fabric comprising polyester fiber and polyester conjugate fiber is subjected to a thermal treatment at a temperature higher 20-80 deg.C than the melting point of the elastomer to fuse a part of fiber-interlacing points in the fabric for providing the objective woven and knit fabric, the polyester conjugate fiber being composed so that a thermoplastic elastomer having a melting point lower >=50 deg.C than the melting point of the polyester covers >=1/2 of the surface of each conjugate fiber. The thermoplastic elastomer is preferably a block copolymerized polyether polyester containing polybutylene terephthalate as a hard segment and polyoxybutylene glycol as a soft segment.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a woven or knitted fabric with excellent bending resilience.

[Prior Art] Conventionally, efforts have been made to improve the bending resilience of general woven and knitted materials, to improve the wrinkle recovery rate of the fibers themselves, and to improve the aggregate structure of woven and knitted materials.

A typical way to do this is to fix the shape of the woven or knitted fabric structure through appropriate heat treatment in the case of woven fabrics that use 100% polyester fibers, so as not to cause deviations in the relative positional relationship of the fibers in the woven or knitted fabric. After that, the fiber surface is dissolved with caustic soda to reduce the binding force between the fibers. As another means, when rayon is mixed, it is commonly practiced to process it with a resin to help fix the shape of the woven or knitted fabric structure in the final finishing process of the woven or knitted fabric.

However, the bending resilience and wrinkle recovery rate of conventional woven and knitted materials are insufficient for the field of uniforms, where the shape retention of clothing is strongly required, or for clothing worn when traveling, where the same clothing is forced to be worn for a long period of time. , improvements were desired.

[Purpose of the Invention] The purpose of the present invention is to provide a woven or knitted fabric with excellent bending resilience and wrinkle recovery rate in order to meet the conventional demands,
Clothing obtained from the woven or knitted fabric has excellent wearing durability.

[Structure of the Invention] The present invention provides a polyester composite fiber having a fiber surface in which a thermoplastic elastomer having a melting point 50° C. or more lower than the melting point of polyester occupies 1/2 or more of the fiber surface;
By heat-treating the woven or knitted fabric made of ordinary polyester fibers at a temperature 20 to 80°C higher than the melting point of the thermoplastic elastomer, at least a portion of the fiber entanglement points in the TIIS fabric are thermally fused. A woven or knitted fabric with excellent bending resilience.

As the thermoplastic elastomer used in the present invention, polyurethane elastomers and polyester elastomers are preferably used.

Polyurethane elastomers usually have a molecular weight of 50.
0 to 6,000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyester amide, etc., and an organic diisocyanate with a molecular weight of 500 or less, such as P, P'-diphenylmethane diisocyanate, tolylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate, 2,6-diycyanatomethylcabroate, hexamethylene diisocyanate, etc.
It is a polymer obtained by reaction with a chain extender having a molecular weight below SOO, such as a glycol, an amino alcohol or a triol. Among these polymers, particularly good are polyurethanes using polytetramethylene glycol, polyε-caprolactone or polybutylene adipate as the polyol. When polyethylene glycol is used as a polyol, it improves hydrophilicity and is therefore used for special purposes. Moreover, P,P'-diphenylmethane diisocyanate is suitable as the organic diisocyanate. In addition, as chain extenders, P, P
'-Bishydroxyethoxybenzene and 1,4-butanediol are preferred.

Examples of polyester elastomers include polyether ester block copolymers obtained by copolymerizing thermoplastic polyester as a hard segment and poly(alkylene oxide) glycol as a soft segment; more specifically, terephthalic acid, isophthalic acid, phthalic acid, and naphthalene. Aromatic dicarboxylic acids such as -2,6-dicarboxylic acid, naphthalene-2,1-dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid, sodium 3-sulfoisophthalate, etc., 1.4 = Dicarboxylic acid selected from alicyclic dicarboxylic acids such as cyclohexane dicarboxylic acid, aliphatic dicarboxylic acids such as succinic acid, oxalic acid, adipic acid, sebacic acid, dodecanedioic acid, and dimer acid, or ester-forming Mil1 forms thereof, etc. at least one of 1,4-butanediol, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol,
hexamethylene glycol, neopentyl glycol,
Aliphatic diols such as decamethylene glycol, 1.1
- At least one diol component selected from alicyclic diols such as cyclohexane dimetatool, 1,4-cyclohexane dimetatool, and trisifodecane dimetatool, or ester-forming derivatives thereof, and an average molecular weight of About 400-5000 polyethylene glycol, poly(1,2- and 1,3-propylene oxide) glycol, poly(tetramethylene oxide) glycol, copolymer of ethylene oxide and propylene oxide, copolymer of ethylene oxide and tetrahydrofuran It is a copolymer consisting of at least one type of poly(alkylene oxide) glycol such as poly(alkylene oxide) glycol.

However, from the viewpoint of adhesion with polyester type [1], temperature characteristics, and strength, a block copolymerized polyether polyester having polybutylene terephthalate as a hard segment and polyoxybutylene glycol as a soft segment is preferred.

The polyester part that makes up this hard segment is
The main component is polybutylene terephthalate consisting of terephthalic acid, isophthalic acid, or a combination thereof and a butylene glycol component.

However, some of the acid components (usually 30 mol% or less) can be replaced with dicarboxylic acid components or oxycarboxylic acid components, or some of the glycol components (usually 30 mol% or less) can be replaced with dioxy components other than the butylene glycol component. It may also be a substituted polyester.

Further, the polyether portion constituting the soft segment may be a polyether substituted with a dioxy component other than butylene glycol. In addition, various stabilizers, ultraviolet absorbers, thickening and branching agents, matting agents, coloring agents, and other various improving agents can also be used as desired.

The degree of polymerization of this polyester elastomer has an intrinsic viscosity of 0.8 to 1.7, more preferably 0.9 to 1.5. When this inherent viscosity becomes low, even if the intertwined portions of short polyester fibers are fused together, the strength is weak and it is easy to break. In addition, during heat-sealing processing, the melt viscosity becomes low, making it easy to flow and cause spots. On the other hand, if the viscosity is too high, the thermoplastic elastomer will be difficult to gather in the intertwined parts, making the intertwined parts weak, which is not preferable.

In the present invention, a composite I fiber in which the thermoplastic elastomer covers at least a majority of its surface and is composited with polyester is used. Examples of these composite forms include those in which the thermoplastic elastomer and polyester are composited in a side-pie-side bimetal type, and those in which the thermoplastic elastomer is composited in a core-sheath type with a sheath and polyester as a core. Ru. Note that the polyester used for the composite fiber can be polyester that is normally used for clothing fibers.

In addition, the ordinary polyester fiber used in the present invention may be any known one, and may be the same type of polyester for clothing used in the polyester composite fiber in the previous two, or a different type. It may be a type of clothing fiber.

The woven or knitted fabric of the present invention is made by using a mixture of these fibers, but various methods can be used to construct a woven or knitted fabric using a mixture of polyester composite fibers and ordinary polyester fibers.

First, as the mixing means, there is mixing in the form of thread. For example, there is a method of intertwisting the polyester composite fiber and a long 11ffl yarn of ordinary polyester fiber or a false twisted yarn thereof, or of mixing the fibers by air processing. On the other hand, when using short IIM polyester fibers, a blend of polyester composite fibers and ordinary short polyester fibers is exemplified. Furthermore, a product obtained by intertwisting a spun yarn made of ordinary polyester fibers and long fibers of the polyester composite fibers can also be used. Alternatively, when constructing a woven or knitted fabric, a method may be used in which polyester composite fibers and ordinary polyester fibers are interwoven or knitted.

Furthermore, the weight ratio of the thermoplastic elastomer constituting the polyester composite fiber is preferably 5 to 40% in the woven or knitted material, and more preferably 10 to 30%.

If this weight ratio is too low, the number of bonding points due to thermal fusion will be too small, resulting in a woven or knitted fabric with low elasticity and repulsion, which is not preferable. Further, problems arise in that the amount of polymer at the bonding points is too small, causing spots and making the bonding points more likely to break.

On the other hand, if this weight ratio is too high, the proportion of polyester 1iAH that constitutes the skeleton of the woven or knitted material will decrease, resulting in insufficient elasticity, which is not preferable.

These thermoplastic elastomers can fuse at least a portion of the 1111 intertwined portions in the woven or knitted fabric, for example, by heating during the dyeing and finishing process.

The temperature of the heat treatment for the fusion bonding must be lower than the melting point of the polyester, and the fusion treatment must not damage the polyester IIN. Examples of damage include the loss of crimps in false twisted yarns due to heat treatment, and the loss of bulky texture formed due to differential heat shrinkage. It is necessary that the material does not deteriorate due to heat, but for this purpose,
The melting point of the thermoplastic elastomer is preferably 50°C or more lower than the melting point of the polyester fiber, and more preferably 60°C or more lower.

[Operation of the invention] Since the present invention is a woven or knitted fabric having the above configuration,
The fusion points formed by the thermoplastic elastomer between the Il rough edges or between the yarns are minutely and uniformly distributed.

Therefore, when stress is applied to the woven or knitted fabric, there is little displacement of the fibers or threads that make up the woven or knitted fabric, and therefore, it exhibits extremely excellent elastic behavior. For this reason, the resulting woven or knitted fabric has a high tension.

It has a texture that is rich in the waist and has excellent bending resilience, and it also has excellent wrinkle recovery properties.

In addition, woven or knitted fabrics that are made bulky by avoiding pressurized processes in the dyeing and finishing process (e.g., calendering, steaming process) will have the above properties as well as excellent compressive elasticity and bulge. The woven or knitted fabric finished through the pressurizing process has a flat surface and a suede-like touch.

Clothes made from the *g products of the present invention have excellent shape stability and are less tiring to wear.

(Example 1) An acid component consisting of an 80/20 mixture of terephthalic acid and isophthalic acid was polymerized with butylene glycol, and 38% of the obtained polybutylene terephthalate was further heated and reacted with 62% of polybutylene glycol (molecular weight 2000). A block copolymerized polyether polyester was obtained. This thermoplastic elastomer has an intrinsic viscosity of 1.0 and a melting point of 1.
The temperature was 55°C.

This thermoplastic elastomer was used as a sheath and polyethylene terephthalate was used as a core, and the yarn was spun using a conventional method so that the core/sheath weight ratio was 507,750. Note that this composite Il fiber is a core-sheath type composite fiber. This fiber was stretched 2.0 times and 7
A yarn of 5de/24 filaments was obtained. One of the composite yarns and two false twisted yarns of polyester long fiber yarn 150 de/48 filaments were combined and twisted at a twist count of 3007/M,
A plied yarn of 370 de was obtained. A plain woven fabric is woven using the twisted yarn, scouring (80°C x 5 minutes), relaxing (boiling x 5 minutes), presetting (180°C x 10 seconds), and dyeing (1
30°C) and final set (160°C x 10 seconds). The physical properties of the finished fabric are shown in Table 1 in comparison with the case where no thermoplastic elastomer composite fiber is mixed.

No. table The fabric properties in Table 1 are determined by the manure measurement method.

1. Measuring method of bending properties ■ Dimensions of sample and chuck interval A sample is held and bent by a chuck with a length of 2.5c++ and a width of icIa at intervals of 1cm.

■ Deformation mode curvature in the range of -2.5 to +2.54 cr'),
Perform gentle bending with constant velocity curvature. The deformation rate is 0.50 (CI
-')/sec.

■ Characteristic values From Figure 1, B: Bending rigidity (j1st: gf-Ci/cm
, 2HB: bending hysteresis (unit: gf - cm/
Find C-).

B shows the slope of the curve between M=0.5 and 1.5.

The hysteresis width in the range of -0.5 to 1.5 is determined as 2HB.

2. Measurement method of wrinkle recovery rate: According to JIS L1096 wrinkle resistance method B (Sensant method).

(Example 2) A sheath type composite III with a thermoplastic elastomer sheath similar to that in Example 1 and a polyethylene terephthalate core with 50 denier/12 filaments and polyester length 111N yarn 75 denier/36 filament false twisted yarn were aligned. ,2
The jersey was knitted using an 8 gauge knitting machine. The obtained knitted fabric was finished through a dyeing/finishing process consisting of scouring, relaxing, presetting, dyeing, and final setting processes.

The texture of the finished knitted fabric was significantly different from that of a normal knitted fabric, and had excellent repulsion and elasticity.

(Example 3) As a thermoplastic elastomer, dehydrated hydroxyl group 102
After mixing and dissolving polymethylene glycol and 1,4-bis(hydroxyethoxy)benzene while stirring in a jacketed kneader, P,P-diphenylmethane diisocyanate was added and reacted at 85°C to obtain a powdered polyurethane. A polyurethane elastomer pelletized by an extruder was obtained. A core-sheath type composite fiber was obtained by using this polyurethane elastomer as a sheath and polybutylene terephthalate obtained by a conventional method as a core. A plain woven fabric was woven using the conjugate fiber in the same manner as in Example 1 to obtain a woven fabric with a texture excellent in waist 1 repulsion.

[Brief explanation of drawings]

Figure 1 shows the bending stiffness (B) and curvature (K
) is a diagram showing a curve. Patent applicant Teijin Ltd.

Claims (1)

[Claims] A woven or knitted fabric consisting of a polyester composite fiber whose fiber surface occupies 1/2 or more of the fiber surface and a thermoplastic elastomer having a melting point 50°C or more lower than the melting point of polyester, and a normal polyester fiber is made of the thermoplastic elastomer. A woven or knitted fabric having excellent bending resilience, characterized in that at least a portion of fiber entanglement points in the woven or knitted fabric are heat-sealed by heat treatment at a temperature 20 to 80°C higher than the melting point.