JPH05171536A - Polyester combined filament yarn - Google Patents

Abstract

PURPOSE:To obtain polyester combined filament yarn, suitable as woven or knitted fabrics, excellent in initial hand and capable of recovering the initial hand even after wearing for a long period. CONSTITUTION:The objective polyester combined filament yarn is polyester combined filament yarn, composed of two or more kinds of filament groups and having 3-40% shrinkage factor in boiling water. At least one filament group is composed of a specific copolyester having 10-80 deg.C glass transition temperature, >=150 deg.C melting point and shape memorizing ability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester blended yarn suitable for a woven or knitted fabric, which is excellent in texture and can recover the initial texture even after being worn for a long time.

[0002]

2. Description of the Related Art Conventionally, heterogeneous shrinkage mixed yarn made of polyethylene terephthalate fiber has been used for silk-like woven and knitted fabrics, which are rich in softness and drape, mainly for women's dresses, blouses, etc. ing. Such different-shrinkage mixed yarns include rewound yarns having different boiling water shrinkage ratios, or undrawn yarns having the same physical properties and drawn by changing heat treatment conditions, or undrawn yarns having different physical properties. It is manufactured by stretching and mixing fibers.

In recent years, in order to meet the demand for a fabric having a softer texture and a tailored appearance, a blended yarn using a copolyester as a polyester constituting a highly shrinkable yarn is available. Many proposals have been made (Japanese Patent Publication No. 60-35450, Japanese Patent Publication No. 55-57013, and Japanese Patent Publication No. 2-19528).
No. 2-19539). However, these mixed yarns
Although it had an excellent texture immediately after production, there was a problem that the initial texture was lost after long-term wearing.

On the other hand, in recent years, a polymer having a shape memory ability has been attracting attention, and JP-A-1-272822 discloses a mixed fiber yarn of polyethylene terephthalate filament and filament having a shape memory ability. .. But,
The filament having the shape memory ability specifically disclosed herein is made of polynorbornene, and has problems such as poor spinnability and poor texture.

[0005]

The present invention is suitable for a woven or knitted fabric which can be easily manufactured, has a good initial texture, and can recover the initial texture even after being worn for a long period of time. It is intended to provide a polyester mixed yarn.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the inventors have made a polyester mixed fiber using a specific copolyester as a polymer having a shape memory ability. It has been found that this object can be achieved by the above, and has reached the present invention.

That is, the present invention is a polyester mixed yarn having a boiling water shrinkage ratio of 3 to 40%, which comprises two or more filament groups, and at least one filament group has 2 or more filament groups.
It is composed of at least one dicarboxylic acid component, 70 mol% or more of which is a dicarboxylic acid component that is an aromatic dicarboxylic acid, and at least one aliphatic diol component as the main components. The gist of the present invention is a polyester mixed yarn, which is made of a copolyester having a shape memory ability of 150 ° C. or higher.

The present invention will be described in detail below. At least one of the filament groups constituting the mixed fiber of the present invention needs to be made of polyester having a shape memory ability. Here, the shape memory ability is
The shape A is molded into an arbitrary shape A, the shape A is fixedly memorized by heat treatment, and then the shape A different from the shape A is once deformed by an external force, and then the shape A is heated to a temperature higher than the glass transition temperature. The function of recovering to.

First, the copolyester having shape memory ability in the present invention must have a glass transition temperature of 80 ° C. or lower. If the glass transition temperature exceeds 80 ° C, the temperature required for shape recovery is too high, which is not practical.
Further, if the glass transition temperature is less than 10 ° C., it is unfavorable because the glass may be wound around the heating roller during drawing or the yarn may be fused.

Further, the copolyester must have a melting point of 150 ° C. or higher. If the melting point is less than 150 ° C, heat setting for imparting a good texture to the mixed yarn, false twisting and high temperature dyeing become difficult, which is not practical.

Further, the copolyester is required to appropriately form a crystalline phase and an amorphous phase, and is composed of two or more kinds of dicarboxylic acid components, 70 mol% or more of which is an aromatic dicarboxylic acid. It is necessary that the main component is an acid component and one or more aliphatic diol components. The homopolymer has too many crystalline phases, and there are few amorphous phases that serve as moving parts for shape recovery, and sufficient shape memory ability cannot be exhibited. Further, the ratio of the aromatic dicarboxylic acid component is
When it is less than 70 mol%, it is not preferable because it does not become stiff when made into a woven fabric.

When all the dicarboxylic acid components are composed of aromatic dicarboxylic acids, it may be difficult to form a crystal phase. For example, when terephthalic acid and isophthalic acid are used, the crystallinity tends to significantly decrease as the proportion of isophthalic acid increases, and the crystal phase cannot be formed.
It is necessary to set the ratio of isophthalic acid to about 5 to 15 mol%. When an aromatic dicarboxylic acid and an aliphatic dicarboxylic acid are used in combination, a copolyester having an appropriate degree of crystallinity can be easily obtained.

Examples of the aromatic dicarboxylic acid component include terephthalic acid, isophthalic acid, 1,4-naphthalenedicarboxylic acid, 2,4-naphthalenedicarboxylic acid, 4,4'-diphenyldicarboxylic acid and diphenoxyethanedicarboxylic acid. Examples of the aliphatic dicarboxylic acid component include dodecanedioic acid, azelaic acid and sebacic acid.

On the other hand, examples of the aliphatic diol component include ethylene glycol, 1,3-propanediol and 1,4-butanediol.

If necessary, the copolyester may be copolymerized with an unsaturated dicarboxylic acid having an intermolecular crosslinkable structure, an unsaturated diol, and a tri- or higher functional compound. Furthermore, the copolyester may be copolymerized with an aromatic diol such as bisphenol A or p, p'-biphenol and other auxiliary materials, if necessary, within a range that does not impair the shape memory ability and the spinnability. Good.

The components constituting the copolyester in the present invention and the copolymerization ratio thereof can be selected in a wide range, but from the viewpoints of economical efficiency, versatility, physical properties, etc., terephthalic acid is 70 to 95 mol%, preferably 80 to 93. Most preferred is a copolyester composed of ethylene glycol and a dicarboxylic acid component consisting of 5 to 30 mol% of dodecanedioic acid, preferably 7 to 20 mol%.

The mixed filament yarn of the present invention has a shape memory ability such as polyethylene terephthalate as long as the entire filament group is composed of a copolyester having a shape memory ability, and within the range where the shape recovery of the mixed filament yarn is not impaired. A combination of filament groups made of normal polyester may also be used.

The proportion of the filament group composed of the copolyester having a shape memory ability with respect to the filament group constituting the mixed fiber can be selected in consideration of the required texture and the degree of recoverability. On the other hand, when the proportion of the filament group composed of the copolyester having a shape memory ability is large, the recoverability to the initial texture is improved.

The mixed yarn of the present invention has a boiling water shrinkage of 3
Must be ~ 40%. This boiling water shrinkage rate is 3%
If the amount is less than 100%, the dyeing property is deteriorated and the temperature of the hot plate at the time of stretching needs to be 200 ° C. or higher, which is not preferable in production. On the other hand, when the boiling water shrinkage exceeds 40%, the thermal stability of the mixed fiber is poor, the yarn quality including the boiling water shrinkage changes with time, and the texture of the woven or knitted fabric becomes unfavorable. ..

The mixed yarn of the present invention is composed of a combination of two or more types of filament groups having different single yarn fineness, filament group fineness, single yarn cross-sectional shape, heat shrinkage characteristics and the like.

The filament fineness of the filament group constituting the mixed filament yarn is appropriately 10 denier or less, preferably 5 denier or less, and the cross-sectional shape of the single yarn may be a circular cross section or a modified shape such as a triangular cross section and is not particularly limited. .. Further, it may contain additives such as a stabilizer, a fluorescent agent, a pigment and a reinforcing agent.

The mixed yarn of the present invention is produced by a usual co-spinning method, a stretched mixed fiber method, a rewind mixed fiber method, a mixed fiber method during processing, and the like. Two types of undrawn yarn groups constituting a filament group are prepared. Simultaneous drawing, mixing and winding while heat-treating under the same or different heat treatment conditions, and method of simultaneously drawing, mixing and winding while heat-treating undrawn yarn groups of the same kind under different heat treatment conditions are productivity, It is preferable in terms of workability.

Further, in order to improve the yarn passing property at the time of weaving, it is preferable to perform a fluid entanglement treatment within a range that does not impair the performance of the mixed fiber.

As a specific method for producing the mixed fiber of the present invention, copolyester having shape memory property is spun separately and wound up to obtain two types of undrawn yarns, and these two types of undrawn yarns are obtained. Stretching to a predetermined ratio while heating with a heating roller, followed by heat treatment by contact with a hot plate, and then fluid entanglement treatment,
A winding method is preferably adopted. At this time, the boiling water shrinkage rate can be adjusted by adjusting the temperature of the hot plate during stretching. Therefore, by increasing the temperature difference between the hot plates through which the yarns pass, it is possible to obtain a mixed fiber yarn having a large difference in boiling water shrinkage.

The shape memory fixation of the mixed fiber of the present invention is performed by stretching,
It is possible to carry out an arbitrary process from false twisting to finishing of the cloth or heat treatment at about 160 ° C. in the state of making clothes. Then, the mixed fiber is deformed, and in order to return it to the original shape, it may be heated to a temperature not lower than the glass transition temperature and lower than the shape fixing temperature, and the deformation automatically occurs to restore the original shape. (Note that when exposed to a temperature higher than the shape memory fixed temperature, the shape at that time is stored.)

[0026]

EXAMPLES Next, the present invention will be specifically described with reference to examples. In addition, the characteristic value of the polyester in an Example is measured as follows. (a) Intrinsic viscosity [η] Measurement is carried out at 20 ° C using an equal weight mixture of phenol and ethane tetrachloride as a solvent. (b) Glass transition temperature (Tg) and melting point (Tm) Measured at a temperature rising rate of 20 ° C / min using a differential scanning calorimeter (DSC-2 type manufactured by Perkin Elmer Co., Ltd.). (c) Boiling water shrinkage rate (100W) After applying a load of 100mg / d to the different shrinkage mixed yarn, measure the sample length L0, and then subject the sample to boiling water treatment for 30 minutes with no load, and again
The sample length L1 is measured by applying a load of 100 mg / d, and is calculated by the following formula. 100W (%) = [(L0-L1) / L0] x 100 (d) Difference in boiling water shrinkage (DW) Different shrinkage mixed yarn is divided into high shrinkage yarn and low shrinkage yarn, and respective boiling water shrinkage W1 , W2 is calculated by the following formula. DW (%) = W1-W2 (e) Evaluation of texture The initial texture is swollen, soft, drape, and
This is judged by an organoleptic test in 8 stages. The case where these are the best is evaluated as the 8th grade, and the worst case is evaluated as the 1st grade. (All are grade 5 or above.)
Next, put 100 g of the sample in an electric washing machine containing 40 g of neutral detergent and 20 liters of water, wash the whole under the conditions of washing time of 5 minutes, dehydration time of 1 minute, rinse time of 8 minutes and dehydration time of 2 minutes, and then air drying. Do the washing method. Then, heat treatment is performed at 80 ° C. for 5 minutes to recover the texture. After repeating washing and recovery 30 times, the texture is evaluated in the same manner as the initial texture.

Production Example 1 45.0 kg of bis (β-hydroxyethyl) terephthalate and its oligomer obtained by the esterification reaction of terephthalic acid and ethylene glycol were mixed with 5.05% of dodecanedioic acid.
8 kg, ethylene glycol 9.0 kg, and tetrabutyl titanate 26 g as a catalyst were added, and 250 kg at 3.6 kg under nitrogen gas pressure suppression.
The esterification reaction was carried out for 2 hours at / cm ² . Then, the esterification reaction product is transferred to a polycondensation reactor, gradually depressurized while raising the temperature, and finally, a polycondensation reaction is performed at 280 ° C. and 0.4 torr for 3 hours to obtain a copolyester having a shape memory ability. (FM
-PET). I got it. The obtained copolyester is
The copolymerization amount of dodecanedioic acid is 10 mol%, Tg 47 ° C, Tm
It was 233 ° C and [η] 0.64.

Production Example 2 Polyethylene terephthalate (PET) of [η] 0.72 was prepared in the same manner as in Production Example 1 except that dodecanedioic acid was not added.
Got the chips.

Example 1 FM-PET was spun at a spinning temperature of 290 ° C. and a spinning speed of 1400 m / min and separately wound, and two types of undrawn yarns A and B having a circular cross section (30d / 12f after the drawn yarn, respectively) 50d / 36f) was obtained. These two types of undrawn yarns are drawn at a drawing speed of 700 m / min, a heating roller temperature of 80 ° C., a hot plate temperature of undrawn yarn A; 110 ° C., undrawn yarn B; 160 ° C., and a draw ratio of 3.5 times. After the heat treatment, a fluid entanglement treatment device was used to impart entanglement with a degree of entanglement of 72 pieces / m, and the material was wound. The obtained mixed yarn is 80d / 48f,
The yarn quality was 26% elongation, 29% boiling water shrinkage, and 20% difference in boiling water shrinkage. Next, twist this mixed yarn at a twist number of 300 T / M,
After sizing at 30 ℃, drying at 85 ℃, warping, weaving, 97 ℃
Relax and scouring with hot water of
A twill fabric was made. This twill woven fabric had a high degree of texture and was also good in texture recovery.

Examples 2 to 6 The same procedure as in Example 1 was carried out except that the temperature of the hot plate was changed and the boiling water shrinkage property was changed. Each of the obtained woven fabrics had a high degree of texture and the texture recovery was good.

Example 7 FM-PET and PET were spun at a spinning temperature of 290 ° C. and a spinning speed of 1400 m / min and separately wound to obtain two types of undrawn yarn having a circular cross section. These two types of undrawn yarn were drawn at a drawing speed of 700 m / min, the heating roller temperature was 80 ° C, the hot plate temperature was FM-PET; 110 ° C, PET; 17
After being stretched at a draw ratio of 3.5 times and heat-treated at 0 ° C., a fluid entanglement treatment device was used to impart entanglement with a degree of entanglement of 72 pcs / m and then to wind. The obtained mixed yarn is 80d / 48f (FM-PET yarn; 30
d / 12f, PET yarn; 50d / 36f), elongation 26%, boiling water shrinkage 28
% And the boiling water shrinkage difference was 22%. Next, this mixed yarn is twisted at a twist number of 300 T / M, glued at 30 ° C, dried at 85 ° C, warped, woven, relaxed and scoured with hot water at 97 ° C, and at 160 ° C. Final heat fixing was performed to prepare a twill fabric.
This twill woven fabric had a high degree of texture and was also good in texture recovery.

Example 8 The copolymerization amount of dodecanedioic acid was 20 mol% and T was the same as in Production Example 1 except that the addition amount of dodecanedioic acid was 11.6 kg.
A copolyester (FM2-PET) having g 32 ° C., Tm 204 ° C. and [η] 0.68 was obtained. Example 1 of this copolyester
After spinning and drawing in the same manner as above, a woven fabric was obtained, and the initial texture and the texture after washing and recovery were evaluated, and both were good.

Example 9 The copolymerization amount of dodecanedioic acid was 30 mol% and T was the same as in Production Example 1 except that the addition amount of dodecanedioic acid was 17.4 kg.
A copolyester (FM3-PET) having g 11 ° C., Tm 186 ° C. and [η] 0.69 was obtained. Example 1 of this copolyester
After spinning and drawing in the same manner as above, a woven fabric was obtained, and the initial texture and the texture after washing and recovery were evaluated, and both were good.

Comparative Examples 1 to 2 Twill fabrics were obtained in the same manner as in Example 1 except that PET was used instead of FM-PET. The obtained woven fabric had a good initial texture, but had a poor texture after washing and recovery.

Comparative Example 3 In Example 1, the boiling water shrinkage was changed by changing the temperature of the hot plate.
% And a difference in boiling water shrinkage difference of 23%, a mixed yarn having a yarn quality was obtained, and was made into a woven fabric by the same method as in Example 1. The obtained woven fabric had a hard texture and could not be put to practical use. Comparative Example 4 In Example 1, the temperature of the hot plate was changed, and the boiling water shrinkage ratio was 2
%, And a difference in boiling water shrinkage ratio of 0% was obtained. Many yarn breakages occurred during stretching, and a stable product could not be obtained.

Comparative Example 5 The same procedure as in Production Example 1 was repeated except that the amount of dodecanedioic acid added was changed to 23.2 kg, and the copolymerization amount of dodecanedioic acid was 40 mol% and Tg.
A copolyester having a temperature of -3 ° C, a Tm of 148 ° C and a [η] of 0.67 was obtained. This copolyester was spun and stretched in the same manner as in Example 1, and then made into a woven fabric. When the texture and the recovery of the texture were evaluated, the texture was hardened by fusion during heat setting at 160 ° C. It became nothing.

The results of Examples 1 to 9 and Comparative Examples 1 to 3 are summarized in Table 1.

[0038]

[Table 1]

[0039]

Industrial Applicability The polyester mixed yarn of the present invention can be easily processed with conventional equipment and can be manufactured at a low cost, so that it is economical and has an excellent shape memory ability. Therefore, if the polyester mixed fiber of the present invention is used, it can be used for applications requiring recovery of texture and shape by utilizing shape memory property. Specifically, it has a high industrial utility value such that it can be used for clothing applications requiring a high degree of texture and recovery of texture.

Claims (1)

[Claims] 1. A polyester mixed yarn having a boiling water shrinkage ratio of 3 to 40%, which comprises two or more filament groups, wherein at least one filament group comprises two or more dicarboxylic acid components. A copolyester having a glass transition temperature of 10 to 80 ° C. and a melting point of 150 ° C. or more, which is composed mainly of a dicarboxylic acid component having an aromatic dicarboxylic acid as a mol% or more and one or more aliphatic diol components A polyester blended yarn characterized by comprising: