JP3014114B2 - Mixed spun yarn - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed spun yarn which can be dyed and which gives a woven or knitted fabric an excellent crispness or heat setting property by an appropriate heat treatment.

2. Description of the Related Art It is well known that a low-melting fiber is melted by mixing a low-melting fiber with a high-melting fiber and then heat-treated to produce a spun yarn with a crisp feeling. Has been made.

For example, two or more kinds of thermoplastic synthetic fibers having different fusing temperatures are fused while being twisted (Japanese Patent Publication No. 46-14586).
No. 2), while drawing two or more fibers having different melting points, some fibers are heated and fused with a hot plate (Japanese Patent Laid-Open No. 42-96254).
A non-spun yarn having a blending ratio of the low melting point component of 3 to 15% by weight and a fusion rate of 0.4 to 0.02% by weight (Japanese Patent Publication No. 55-14180)
No.), false twist processing is performed on a fiber bundle containing low melting point fibers, and the low melting point fibers are fused to form a spun yarn (see Japanese Patent Application Laid-Open No. 48-9052).
No. 5), an open-end spun yarn containing 5 to 20% by weight of a low-melting fiber and fused to a high-melting fiber (JP-A-54-34).
No. 444), when several spun yarns are combined, a low-melting synthetic fiber or a spun yarn is put in the center and heat-treated, and they are adhered to each other on the inner surface in contact with the core yarn (JP-A-55-158340).
No.) and heat-bonding a yarn cloth in which synthetic fibers having heat resistance are mixed with fibers having a melting point lower by about 50 ° C. by 10 to 20%, and the like. However, in these prior arts, the low melting point fibers generally have low crystallinity, so that when the temperature reaches the glass transition point or higher, these low melting point fibers begin to soften.
Therefore, when dyeing a spun yarn containing a low-melting fiber or a fabric obtained by knitting it, the low-melting fiber is fused at that stage,
It has a rough texture. For this reason, it has not been possible to give a proper crispness to the fabric by heat treatment after dyeing or to perform a desired heat setting.

Problems to be Solved by the Invention The present invention is to solve such problems.

In other words, it has good low-melting crystalline properties that it adheres well to heat-resistant fibers, does not soften at the time of dyeing, and is then melted by a heat treatment at a temperature equal to or higher than the crystal melting point to impart excellent crispness or heat-setting properties to the woven or knitted fabric. An object of the present invention is to provide a mixed spun yarn comprising a binder fiber and a heat-resistant fiber.

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and as a result, have reached the present invention. That is, the present invention comprises a heat-resistant fiber and a linear aliphatic component having 4 or more carbon atoms, and has a crystal melting point.
The ratio (b / a) of the height (b) of the cooling crystallization peak measured by DSC and the half-value width (a) of the cooling crystallization peak measured by DSC at 110 ° C. to 220 ° C. A spun yarn comprising a low melting crystalline polyester binder fiber having a melting point of 0.2 or more.

 Hereinafter, the present invention will be described in detail.

First, the polyester-based binder fiber, which is a component of the mixed spun yarn of the present invention, is made of a polyester polymer containing a linear aliphatic component having 4 or more carbon atoms. Aliphatic diols such as butanediol, 1,8-octanediol, 1,9-nonanediol and 1,10-decanediol; adipic acid, sebacic acid, tetradecane-1,14-dicarboxylic acid and octadecane-1 Aliphatic dicarboxylic acids such as 1,18-dicarboxylic acid and eicosane-1,20-dicarboxylic acid. By introducing a linear aliphatic component having 4 or more carbon atoms into the polyester polymer, the crystallinity is increased, and the crystal melting point is easily observed. Since the crystalline melting point of the polyester-based binder fiber is determined by the type of these linear aliphatic components and the proportion of the polyester polymer in all the repeating units, the crystalline melting point is appropriately adjusted so that the crystalline melting point is 110 ° C or more and 220 ° C or less. The type and amount of the chain aliphatic component may be determined.

Next, the polyester-based binder fiber which is a component of the mixed spun yarn of the present invention is made of a low-melting polyester polymer having a crystal melting point of 110 ° C or higher, preferably 130 ° C or higher, and 220 ° C or lower, preferably 200 ° C or lower. Is softened and fused at the time of dyeing when the crystal melting point is less than 110 ° C.,
It is not preferable because it gives a rough texture. On the other hand, when the crystal melting point exceeds 220 ° C., a mixed spun yarn is prepared using natural fibers as heat-resistant fibers to form a fabric, and when the fabric is heat-set, there is a problem that the natural fibers are discolored or decomposed. It is not preferable because it occurs. Further, when synthetic fibers are used as the heat-resistant fibers, the synthetic fibers are deformed due to heat setting of the fabric, resulting in a paper-like feeling, which is not preferable. Further, the polyester-based binder fiber,
D of height (b) of cooling crystallization peak measured by DSC
A ratio (b / a) of the temperature-reducing crystallization peak measured by SC to the half width (a) (b / a) of at least 0.2, preferably at least 0.5, particularly preferably at least 1.0, comprising the crystalline polyester polymer, When the ratio (b / a) is less than 0.2, the heat resistance is inferior, that is, even when the melting point is 110 ° C. or higher, the amorphous portion starts to soften at a temperature equal to or higher than the glass transition point.
Exposure to the dyeing temperature of the polyester fiber of about 30 ° C. is not preferable because fusion occurs between the fibers and a rough texture is obtained.

Specific examples of the low-melting crystalline polyester polymer according to the present invention include those shown in Table 1 below.

Among these low-melting polyester polymers, those having terephthalic acid, ethylene glycol, 1,4-butanediol, 1,6-hexanediol, and neopentyl glycol as constituents are preferable from the viewpoint of economic efficiency.

The low-melting polyester polymer used in the present invention may be copolymerized with other components as long as the effects of the present invention are not impaired.In addition, matting agents, stabilizers, and additives such as coloring agents are added. Is also good.

The polyester-based binder fiber used in the present invention is made of the low-melting crystalline polyester polymer, and a single-component fiber consisting only of the polyester polymer and the polyester polymer being entirely or partially on the surface of the single fiber Core-sheath type, side-by-side type,
It contains conjugate fibers of sea-island type, split fiber type and the like.

Further, as the heat-resistant fiber referred to in the present invention, cotton, natural fibers having no melting point such as wool or cellulose-based fibers such as hemp, chemical fibers such as rayon, semi-synthetic fibers such as acetate, general acrylic fibers, Nylon fiber, polyester fiber and the like can be mentioned.

By the way, a spun yarn obtained by mixing a heat-resistant fiber with a conventional low-melting polyester fiber or a woven or knitted fabric obtained therefrom can be fused by heat treatment. However, conventionally, the fused polyester is rigid, and the handle becomes too hard, or the bond may be released due to repeated bending, and the handle may change.

On the other hand, the polyester spun yarn of the present invention contains a low-melting polyester containing a straight-chain aliphatic component having 4 or more carbon atoms. Since it shows elasticity, it is difficult for the fusion to come off, and the feeling can be maintained even with repeated bending.

The low-melting crystalline polyester-based binder fiber constituting the mixed spun yarn of the present invention can be used in a mixing ratio of 10 to 90% by weight of the whole, but is preferably 20 to 70% by weight.
% By weight is appropriate. When the mixing ratio is less than 10% by weight, adhesion to the heat-resistant fiber is not sufficiently performed, and the cloth tends to have an appropriate sharp feeling or to have difficulty in imparting heat setting property. Conversely, if the content exceeds 90% by weight, the heat treatment excessively promotes fusion, and the spun yarn may become too hard, which is not preferable.

The heat treatment for imparting a crisp feeling or heat setting property to the mixed spun yarn of the present invention and the woven or knitted fabric obtained therefrom is performed at a temperature higher than the melting point of the low-melting crystalline polyester component, and the heat-resistant fiber is significantly colored or decomposed. What is necessary is just to carry out at the appropriate temperature of the range below the temperature.

Action The low-melting crystalline polyester-based binder fiber which is a component of the mixed spun yarn of the present invention has a clear crystalline melting point. Therefore, even if heat treatment (for example, dyeing) is performed at a temperature equal to or higher than the glass transition point and equal to or higher than the melting point, it does not soften or fuse. Can be heat set.

Examples Next, the present invention will be specifically described based on examples.
The various characteristic values in the examples were measured by the following methods.

Relative viscosity: Measured at a sample concentration of 0.5 g / dl and a temperature of 20 ° C. using an equal weight mixture of phenol and ethane tetrachloride as a solvent.

Crystal melting point: Perkin-Elma Differential Scanning Calorimeter DSC-
The measurement was performed at a heating rate of 20 ° C./min using a type 2 sample.

Temperature crystallization peak height measured by DSC (b)
Ratio (b / a) between the temperature and the half-value width (a) of the cooling crystallization peak measured by DSC: using a differential scanning calorimeter DSC-2C manufactured by Perkin Elmer Co., Ltd., sample amount 10 mg, heating rate 20 ° C /
After raising the temperature to (melting point + 30) ° C of the measurement sample in 20 minutes,
It was determined from the temperature-reducing crystallization peak when the temperature was lowered at ° C / min.
FIG. 1 is a schematic diagram showing a cooling crystallization peak measured by DSC, in which the vertical axis represents the amount of heat (mcal / sec) and the horizontal axis represents the temperature (° C.). The height (b) of the cooling crystallization peak is the height (mcal / sec) of the maximum point with respect to the base line, and the half width (a) of the cooling crystallization peak is the height (b) of the cooling crystallization peak. And the peak width (° C.) at half the height. In the measurement, the chart speed was set to 20 mm / min.

Example 1 Dimethyl terephthalate (DMT) was mixed with 1,4-butanediol and 1,6-hexanediol at a BD / HD molar ratio of 68/32,
Moreover, it was charged so that the molar ratio of glycol to DMT was 1.6: 1, and 3 ×
Transesterification and polycondensation using 10 ^-4 mol of tetrabutyl titanate as a catalyst, relative viscosity 1.53, crystal melting point 170 ° C, D
Temperature crystallization peak height (b) measured by SC and DS
A polyester polymer A having a ratio (b / a) of 2.37 to the half width (a) of the temperature-reducing crystallization peak measured by C was obtained.

The chips of the polyester polymer A and the chips of the polyester polymer B made of polyethylene terephthalate having a relative viscosity of 1.38 are dried under reduced pressure, and then melted using a conventional composite melt spinning apparatus. Combined B core, composite ratio (weight ratio) (A / B) 1/1
Through a spinneret having 265 spinning holes at a spinning temperature of 270 ° C. and a total discharge rate of 230 g / min. After cooling the spun fiber yarn, it was taken at a take-up speed of 1000 m / min to obtain an undrawn fiber yarn. The obtained yarns were bundled, 100,000-denier tow was drawn, drawn at a draw ratio of 3.4, at a drawing temperature of 60 ° C., heat-treated with a heat drum at 150 ° C., and subjected to crimping using an indentation type crimper. Thereafter, the fiber was cut into a length of 38 mm to obtain a core-sheath composite polyester binder fiber having a single yarn fineness of 2.4 denier.

The polyester binder fiber is mixed with cotton and cotton
The cotton was blended so as to have a ratio of 1: 1 to obtain a 20's mixed spun yarn through carding, drawing, roving, and spinning. Spun yarn 103
The woven fabric was made into a woven fabric under the conditions of woven fabrics of book / inch, 87 wefts / inch and a width of 90 cm, and subjected to desizing scouring, bleaching, and mercerizing according to a conventional method. The woven fabric was dyed at 130 ° C. for 1 hour with a disperse dye and a dispersant using a high-pressure beam dyeing machine. After reduction washing, the fabric was directly dyed with a dye at 100 ° C. for 1 hour to obtain a blue cloth. This fabric had no change in feel before dyeing. When this was ironed at 175 ° C, heat setting could be performed.

Examples 2 to 4 and Comparative Example 1 Polyester A was prepared by combining various dicarboxylic acid components and glycol components as shown in Table 2 above.
I got

A woven fabric made of a mixed spun yarn was produced in the same manner as in Example 1 except that this polymer A was used as the polyester polymer constituting the binder fiber.

Using this fabric, dyeing was carried out in the same manner as in Example 1 except that the dyeing temperatures shown in Table 2 were used. In the case of Examples 2 to 4, the texture after dyeing was almost (Example 2) or not changed at all (Examples 3 and 4) as compared to before dyeing, and then heat set by ironing or hot roller treatment (Example 4). We were able to.

In the case of Comparative Example 1, after dyeing, the entire fabric solidified firmly, so that, for example, when a shirt was made from the fabric, it was impossible to partially heat set the cuffs and the collar.

Comparative Example 2 As polyester polymer A, a terephthalic acid / isophthalic acid molar ratio of 65/35 and ethylene glycol were used, the relative viscosity was 1.38, the crystal melting point by DSC was not observed, and the temperature-induced crystallization peak was not observed.
A woven fabric made of a mixed spun yarn was obtained in the same manner as in Example 1 except that the stretching process was performed without using a heat drum in a stretching process using a polymer at 0 ° C. Example 1 was repeated except that the dyeing temperature with the disperse dye was 116 ° C.
Staining was performed in the same manner as described above. The obtained fabric had a hard and stiff texture as a whole before dyeing.

Example 5 A polyester binder fiber was obtained in the same manner as in Example 1 except that the length was cut to 64 mm. A woven fabric was obtained in the same manner as in Example 1, except that the polyester-based binder fiber was mixed with wool so as to be 1: 1 using a cotton blending machine. This cloth is scoured and cooked (100 ℃,
After 2 minutes), using a disperse dye, an acid dye, a carrier, and a dispersant, the mixture was dyed with a beam dyeing machine at 105 ° C. for 1 hour to obtain a red cloth.

This fabric had no change in feel before dyeing. When this was ironed at 175 ° C., it could be heat set.

Example 6 A woven fabric was obtained in the same manner as in Example 1 except that the length was cut to 51 mm and mixed with rayon. This fabric was dyed in the same manner as in Example 1 except that bleaching and mercerizing were not performed. The texture of the fabric after dyeing was not different from that before dyeing. When this was ironed at 175 ° C., heat setting could be performed.

Example 7 In the same manner as in Example 1 except that ordinary polyester cotton (1.5 denier-38 mm length, melting point: 255 ° C.) was used instead of cotton and the dyeing with a direct dye was omitted, a blue A dyed fabric was obtained. This fabric had no change in feel before dyeing. When this was ironed at 175 ° C., heat setting could be performed.

Effect of the Invention As described above, the use of the mixed spun yarn of the present invention makes it possible to perform dyeing without changing the feeling even after dyeing. Can impart heat setting properties such as creasing.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a temperature-reducing crystallization peak measured by DSC.

Claims (1)

(57) [Claims] 1. A heat-resistant fiber, comprising a linear aliphatic component having 4 or more carbon atoms and having a crystal melting point of 110 ° C. or more and 220 ° C. or less, and DSC
Of crystallization peak (b) and DSC measured by cooling
And a low-melting crystalline polyester-based binder fiber having a ratio (b / a) of 0.2 or more to the half width (a) of the temperature-reducing crystallization peak measured by the above method.