JPH06207313A - Elastic yarn having improved stickiness - Google Patents

Abstract

PURPOSE:To obtain elastic yarn having improved stickiness and excellent unwinding properties. CONSTITUTION:A polyurethane is mixed with 0.2-1.0wt.% spherical solid polyalkylsiloxane having 0.5-4.5mum average particle diameter and spun to give elastic yarn, which is provided with a polyalkylsiloxane solid at normal temperature.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an elastic yarn having high elasticity and improved stickiness.

[0002]

2. Description of the Related Art Conventionally, to prevent the stickiness of yarns,
1. 1. A higher fatty acid metal salt is dispersed in a spinning oil agent to prevent the thread from sticking by adding a metal soap-containing oil agent to the thread. The higher fatty acid metal salt is added to the polymer in an amount of 0.
Disperse 3% by weight or more to prevent spinning and spinning. Japanese Examined Patent Publication (Kokoku) No. 42-8438 describes that polyamylsiloxane is added as a component of an oil agent and the oil agent is applied to the yarn to prevent sticking.

[0003]

[Problems to be Solved by the Invention] Therefore, even if this polyalkylsiloxane is added, the stickiness of the yarn cannot be sufficiently prevented, and the unwinding of the elastic yarn from the teeth does not go smoothly, and the stickiness of the inner layer of the teeth is prevented. Therefore, problems such as uneven tension of the yarn and cutting of the yarn occur in the elastic yarn post-processing step. An object of the present invention is to provide an elastic yarn in which sticking of such elastic yarn is prevented, and in particular, the unwindability of the yarn in the inner layer of the elastic yarn chase is improved. 2. Then, a large amount of higher fatty acid metal salt is dispersed in the polymer, but not only becomes difficult to disperse,
It has a bad influence on the yarn focusing property. Usually, elastic yarn is spun as a multifilament and bundled by applying false twist.

If the bundle is not sufficiently focused, the filament is divided by static electricity or the like during the post-processing steps such as warping, circular knitting, covering, etc., and the yarn is cut. From this viewpoint, it is not preferable for the elastic yarn to disperse a larger amount of the higher fatty acid metal salt in the polymer.

[0005]

According to the present invention, a spherical solid polyalkylsiloxane having an average particle diameter of 0.5 to 4.5 μm is contained in polyurethane in a proportion of 0.2 to 1.0% by weight and spun. An elastic thread having improved stickiness, characterized in that the polymer is spun, and an oil agent in which a polyalkylsiloxane that is solid at room temperature is dissolved is applied to the elastic thread, which is solid at room temperature in the oil agent. The polyalkyl siloxane is a polymethylphenyl siloxane and / or n-butyl siloxane, and the amount contained in the oil agent is 2 to 10
% Of the elastic yarn, and the spherical solid polyalkylsiloxane is polymethylsiloxane.

The spherical solid polyalkylsiloxane used in the present invention has an average diameter of 0.5 to 4.5 μm, preferably 1.0 to 3.0 μm. Among them, it is preferable that the polyarnorsiloxane is polymethylsiloxane. The polyalkylsiloxane can be obtained by reacting alkyl trialkoxysilane, and for example, there is Tospar under the trade name of Toshiba Silicon Co. Basically, it has a structure represented by-(RSiO _1.5 ) _n , and the ratio of R / Si (R represents an alkyl group) is preferably in the range of 1.0 ± 0.2. The effect will be reduced if it goes off.

The polyurethane constituting the yarn used in the present invention is a mixture of polyester glycol or polyester glycol having a number average molecular weight of 600 to 5000 (polyurethane or polyurethane urea, abbreviated as polyurethane hereinafter) and excess. Molar organic diisocyanate
To obtain an intermediate polymer having an isocyanate group as a terminal group by reacting it with an organic compound, dissolving the intermediate polymer in an inert solvent, and then adding the organic diamine for chain extension reaction. . Of course, the chain extension reaction may be performed by adding diol, but in the present invention, the polyurethane obtained by the chain extension reaction using an organic diamine will be described below.

The polymer solution obtained as described above is impregnated with spherical polyalkylsiloxane in a proportion of 0.2 to 1.0% by weight, and the polymer solution is dry-spun. As described above, when 1.0% by weight or more of the polyalkylsiloxane is contained in the polymer, filament splitting or the like occurs and the post-process passability decreases. 0.2% by weight
In the following, the effects of the present invention are often reduced. As the above-mentioned polyethylene glycol, polytetramethylene ether glycol, polyethylene ether glycol,
Examples include polypropylene ether glycol and the like. The polyester glycol is obtained by polycondensing an organic fatty acid such as succinic acid or adipic acid with an organic glycol such as ethylene glycol, propylene glycol, butanediol or hexanediol. Is mentioned. Preference is given to using polytetramethylene ether glycol having a number average molecular weight of 1000 to 3000.

The organic diisocyanate compound as a raw material of the polyurethane used for the yarn construction of the present invention includes p, p'-diphenylmethane diisocyanate,
2,4-toluene diisocyanate, 1,4-phenylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate and the like can be mentioned. Especially p, p '
-Diphenylmethane diisocyanate is preferred. Further, the polyether glycol or polyester glycol and the organic diisocyanate compound are used when the ratio of isocyanate group to hydroxyl group is between 1.3 and 2.6. As the organic diamine, hydrazine, ethylenediamine, 1,2-propylenediamine, 1,4-butylenediamine, 1,6-hexamethylenediamine, 1,
3-cyclohexyldiamine, 4,4'-diaminodiphenylmethane, 4,4'-diaminodicyclohexylmethane, m-xylylenediamine and hydrogenated products thereof, p-
Examples thereof include diamines such as xylylenediamine and hydrogenated products thereof, or a mixture thereof.

The inert solvent used in the polymerization reaction includes N, N-dimethylformamide, N, N-dimethylacetamide, N, N, N ', N'-tetramethylurea and N-methylpyrrolidone. , Dimethyl sulfoxide, and the like. In the obtained polymer solution, in addition to spherical solid polyalkylsiloxane having an average diameter of 0.5 to 4.5 μm, if necessary, an antioxidant, an ultraviolet absorber, a pigment, a compound containing a tertiary amino group, etc. Is added. The polymer solution thus obtained is dry-spun by a usual method, and the filament is bundled by a method such as a twisting process and an oil agent is applied. The oil agent used in the present invention contains polyalkylsiloxane which is solid at room temperature in an amount of 2 to 10% by weight. A polyalkylsiloxane which is solid at room temperature can be obtained as follows. A polyalkylsiloxane can be obtained by reacting an alkyl trialkoxy sila in an inert solvent such as toluene or xylene to remove an alcohol. Dimethylsiloxane is added to the obtained polyalkylsiloxane solution, and the solvent is distilled off by heating to finally obtain a polydimethylsiloxane mixture of polyalkylsiloxane.

Preferred polyalkyl siloxanes are polymethyl phenyl siloxanes and poly n-butyl siloxanes. Further, dimethylsiloxane is mixed in the oil agent in an amount of 98 to 60% by weight, and if necessary, modified silicone, mineral oil and the like can be mixed.
The yarn provided with the oil agent is wound on a bobbin by a usual method. The elastic yarn thus obtained prevents the yarns from sticking to each other, and the unwinding of the elastic yarn from the teeth is smooth.
It is. In particular, the unwinding of the elastic yarn in the inner layer of the chase is improved. The unwinding of the elastic yarn from the cheese is evaluated as follows. The chase was set on a satin-finished roller having a diameter of 10 cm, and the surface speed of the roller was 5 per minute.
Adjust so that the speed is 0 m. On one side, a bobbin for winding is set on a satin-finished roller having the same diameter. The elastic yarn sent out at 50 m / min is wound up on one winding bobbin. At that time, the elastic yarn sent out adjusts the winding roller to a minimum speed at which the elastic yarn cannot be pulled up in the rotational direction of the teeth. The lowest roller
The surface velocity of the is measured and the unwinding property is expressed as follows.

Unwindability (%) = {(S−S ₀ ) / S ₀ } × 100 where S ₀ is the delivery speed of the elastic yarn (50 m / min) S is the minimum winding speed of the elastic yarn (m That is, the unwinding property of 0% indicates that the unwinding of the elastic yarn from the teeth can be performed without tension.
The fact that the unwinding property of the inner layer of the cheese is 0% indicates that it is difficult to maintain the shape of the cheese,
A value of 0% or more is usually indicated. It is an object of the present invention to obtain an elastic yarn chase having an unwinding value of 90% or less, preferably 70% or less. The preferred value of unwinding is 5 to 90%
And more preferably 15 in the inner layer of cheese.
It is a value of 85%.

The invention is illustrated in the examples below.
It should be noted that these examples illustrate the present invention and are not limited thereto. In the examples, the parts are weighted and the unwinding property is evaluated according to the above method.

【Example】

(Example 1) 975 parts of polytetramethylene ether glycol having a number average molecular weight of 1950 and 250 parts of 4,4'-diphenylmethane diisocyanate were placed in a polymerization flask and stirred to 70 ° C along the oil. Heated. After heating for 1 hour, the oil was removed, 2450 parts of N, N-dimethylacetamide was added, and the reaction mixture was dissolved while cooling on ice. When the internal temperature reached 8 ° C, 22.8 parts of ethylenediamine, 7.03 parts of 1,2-diaminopropane, 1.73 parts of N, N-diethylamine were added to N,
A solution dissolved in 500 parts of N-dimethylacetamide was gradually added dropwise while stirring. After adding a total of 500 parts of amine solution, N, N-diethylamine 6.8.
Part, a solution of 30 parts of N, N-dimethylacetamide was added. To the obtained polymer solution, 1% by weight of a 10% by weight dimethylacetamide dispersion of polymethylsiloxane having an average particle size of 2.0 μm (TOSPAR 120 manufactured by Toshiba Silicone Co., Ltd.) was used.
6.7 copies. The polymer solution thus obtained was fed at a rate of 4.4 g / min to a spinneret having two pores. Then, it was extruded from the pores into hot air to evaporate the solvent. The dried yarn was passed through a false twisting machine that generates a swirling air flow, and after being false twisted, contacted with an oiling roller.

For the oiling roller, 20% by weight of 1
0 cst Polydimethylsiloxane mixture viscosity is 25 °
5 parts of poly n-butyl siloxane of 26 cst in C, 20 parts of mineral oil having a viscosity of 60 seconds by a Redwood viscometer,
An oil solution consisting of 75 parts of dimethylsiloxane having a viscosity of 10 cst was supplied. The surface speed of the oiling roller was adjusted so that the amount of the applied oil agent was 6% by weight with respect to the yarn. The yarn provided with the oil agent was wound on a bobbin at a speed of 600 m / min. An elastic yarn of 400 g was wound on a bobbin to obtain a 20-denier elastic yarn chase. After leaving the obtained cheese in an atmosphere of 45 ° C. for 24 hours, the unwinding properties of the surface layer and the inner layer of the cheese were measured. As a result, the surface layer was 13% and the inner layer was 52%. The obtained chase was set in a covering machine, an elastic yarn was sent out at a speed of 6 m / min, a nylon-processed yarn was wound and wound at 21 m / min. As a result, the unraveling of the elastic yarn from the chase was not taken to the inner layer in the direction of rotation of the chase. Further, the obtained seeds were placed on a roller, sent out at a speed of 200 m / min and combined with a nylon-processed yarn, and then the elastic yarn and the nylon-processed yarn were entangled with an air stream at a speed of 625 m / min. I rolled it up. Also in this result, the unraveling of the elastic yarn from the chase was performed without reaching the inner layer in the rotational direction of the chase.

(Example: 2) 900 parts of polytetramethylene ether glycol having a number average molecular weight of 1800 and 4,
200 parts of 4'-diphenylmethane diisocyanate was placed in a polymerization flask and heated to 70 ° C on an oil bath while stirring. After heating for 90 minutes, remove the oil bath,
2300 parts of N-dimethylacetamide was added, and the reaction mixture was dissolved while cooling on an ice-water bath. When the internal temperature reached 8 ° C, 16.2 parts of ethylenediamine was added to N,
A solution in which 320 parts of N-dimethylacetamide was dissolved was gradually added dropwise with stirring. After adding about 280 parts, the ice-water bath was removed, and the amine solution was added dropwise.
After adding a total of 328 parts of the amine solution, a solution of N, N-diethylamine 5.7 parts and N, N-dimethylacetamide 54 parts was added to obtain a polymer solution. To the obtained polymer solution, Tosperse 120 manufactured by Toshiba Silicone Co., Ltd.
5.6 parts of (average particle size 2.0 μm methyl siloxane) were added to give 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethyl-benzyl) isocyanuric acid 1
1 part and 34 parts of a 50% by weight N, N-dimethylacetamide solution of poly (N, N-diethylaminoethyl) methacrylate were added and stirred for 45 minutes. The polymer solution thus obtained was fed at a rate of 4.40 g / min to a spinneret having two pores. Then, it was extruded from the pores into hot air to evaporate the solvent. The dried yarn was passed through a false twisting machine that generates a swirling air flow to give false twist, and then contacted with an oiling roller. The same oil agent as in Example 1 was supplied to the oiling roller. The surface rule of the oiling roller was adjusted so that the amount of the applied oil agent was 6% by weight with respect to the yarn. The elastic yarn to which the oil agent was applied was wound around a bobbin at a speed of 600 m / min. 400
20 g of elastic yarn cheese was obtained by winding g of elastic yarn around a bobbin. After leaving the obtained cheese in an atmosphere of 45 ° C. for 24 hours, the unwinding properties of the surface layer and the inner layer of the cheese were measured. As a result, the surface layer was 18% and the inner layer was 45%.
In addition, the obtained cheese was placed in a covering machine, and 6 minutes per minute.
The elastic yarn was sent out at a speed of m, and the nylon processed yarn was wound and wound at 21 m / min. As a result, the unraveling of the elastic yarn from the cheese was not taken up to the inner layer in the direction of rotation of the cheese. Further, the obtained cheese was placed on a roller, sent out at a speed of 200 m / min and combined with the nylon-processed yarn, and then the elastic yarn and the nylon-processed yarn were entangled with an air stream and wound up at a speed of 625 m / min. Also in this result, the unraveling of the elastic yarn from the cheese was performed without reaching the inner layer in the direction of rotation of the cheese.

Comparative Example 1 A polymer solution was obtained in the same manner as in Example 1 except that Tosperse 120 manufactured by Toshiba Silicone Co. was not added. Further, spinning was performed in the same manner as in Example 1 to obtain elastic yarn cheese. With respect to the obtained cheese, the unwinding property, the covering and the entangled yarn were evaluated in the same manner as in Example 1. As a result, surface unwinding property is 35%, inner layer unwinding property is 1
It was 15%. When set on a covering machine, the unraveling of the elastic yarn was not taken in the rotational direction of the cheese in the surface layer, but it was observed in the inner layer in the rotational direction of the cheese. However, the cutting of the elastic thread was not complete.
Similarly, in the case of the entangled yarn, the unraveling of the elastic yarn was not taken in the rotation direction of the cheese in the surface layer, but was cut in the rotation direction of the cheese in the inner layer.

(Example 3) In Example 2, instead of adding Tosperse 120 manufactured by Toshiba Silicone Co., methyl siloxane as shown in Table 1 was added, and spinning was performed in the same manner as in Example 2 to obtain an elastic yarn cheese. . Further, regarding the obtained cheese, in the same manner as in Example 1, unwinding property, covering,
The entangled yarn was evaluated. The results are also shown in Table 1.

[0018]

[Table 1]

[0019]

According to the present invention, the sticking of cheese on the elastic yarn is prevented and the process passability in the processing step is also improved.

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Claims (2)

[Claims] 1. A spherical solid polyalkylsiloxane having an average particle size of 0.5 to 4.5 μm is added to polyurethane by 0.2 to 0.2 μm.
An elastic yarn having improved stickiness, which is characterized in that it is contained at a ratio of 1.0% by weight and spun. 2. The elastic yarn according to claim 1, wherein an oil agent containing polyalkylsiloxane which is solid at room temperature is applied to the spun elastic yarn.