JPH02229272A - Production of polyester yarn for non-sized weaving - Google Patents

Abstract

PURPOSE:To obtain warp capable of weaving in high-speed WJL without sizing by subjecting normal polyester to melt spinning, supplying oil having specific composition to resultant yarn, performing drawing and confounding treatment and obtaining drawn yarn having excellent smoothness. CONSTITUTION:(A) 20-50wt.% polyether compound obtained by random polymerization of propylene oxide and ethylene oxide in a weight ratio of 60:40-20:80 and having 4000-10000 molecular weight is mixed with (B) 20-40wt.% fatty ester expressed by the formula R<1>COOR<2> (R<1> is 7-20C alkyl or alkenyl; R<2> is 5-18C alkyl or alkenyl), (C) 10-30wt.% nonionic surfactant expressed by formula I-formula IV (R<3>-R<8> are 8-18C alkyl or alkenyl; n is 4-20) and (D) antistatic agent (e.g. Na salt of sulfonate) to obtain an oil. Next, said oil is emulsified and supplied to polyester undrawn yarn obtained by melt spinning with an attaching amount of 0.5-1.3%, then the yarn is subjected to drawing and confounding treatment to afford polyester drawn yarn having excellent smoothness, coherence and antistatic properties without generating fuzz or yarn breaking.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention... The present invention relates to a method for producing polyester yarn for warp yarns that can be woven using an 8-speed water jet L7 troom (WJL) without sizing.

(Prior Art) Multifilament yarns made of polyester, typified by polyethylene terephthalate, are widely used as textiles. In recent years, for the purpose of saving labor and energy, a method of weaving by WJL, omitting sizing before weaving, has become widely practiced.

Yarn used for such sizeless weaving does not require a sizing process, so it must be given cohesiveness at the raw yarn stage. As a method to obtain yarn with good cohesiveness that can be woven without glue,
Adding a spinning oil with good convergence and performing an entangling treatment are practiced (Japanese Patent Publication No. 53-4695).
No. 7, No. 63-9080. Japanese Patent Publication No. 1983-21
980 etc.).

However, the conventional method shows good weaving performance at the normal WJL weaving speed (approximately 500 rpm), but when the speed is higher than this, fuzz and thread breakage occur frequently, resulting in poor weaving performance. was there.

(Problems to be Solved by the Invention) The present invention aims to provide a method for producing polyester yarn that does not generate fuzz or yarn breakage even when weaving at high speed WJL in a non-sizing state.

(Means for Solving the Problems) The present invention solves the above problems, and the gist thereof is as follows.

When manufacturing polyester multifilament yarn,
An oil agent having the following composition is added to the melt-spun yarn by 0.5 to 1.
A method for producing a polyester yarn for glueless weaving, characterized by adhering 3% by weight and subjecting it to one stretching and one entangling treatment.

(propylene oxide and ethylene oxide are randomly copolymerized at a weight ratio of 60: 40 to 20; ~40% by weight
R'COOR' (Rl is an alkyl group or alkenyl group having 7 to 20 carbon atoms; Bt is an alkyl group or alkenyl group having 5 to 18 carbon atoms.) (c) Represented by formulas (a) to (d) Nonionic surfactant 10-30% O R 3C O O (C Hz C H 2
0 ) n H@R'COO(CHzCHzO)n
OcR'Cl R110(CHzCHzO)nHO
R'O(CH!CH.O)nR' (Rff to R8 are alkyl or alkenyl groups having 8 to 1 carbon atoms, n is an integer of 4 to 20.) + d) Antistatic agent 3 to 13% by weight The present invention will be explained in detail below.

First, the present invention uses a specific random copolymer of propylene oxide and ethylene oxide (PO
/EO copolymer) type polyether compound. It is characterized by applying a spinning oil containing a fatty acid ester, a nonionic surfactant, and an antistatic agent in a specific ratio.

Generally, the spinning oil for polyester yarn used in textiles has a smoothness. Convergence. Combinations of mineral oil and various fatty acid esters are often used to improve antistatic properties, and polyether compounds are also used for polyester yarns for glueless weaving in WJL.

The inventors of the present invention have conducted intensive studies, noting that in addition to smoothness, convergence, and antistatic properties, the following requirements are necessary in order to smoothly perform glueless weaving using high-speed WJL. .

■ When driving the weft yarns by water jet, prevent the oil from falling off from the warp yarns and reduce strength due to scratches on the reed.

■ Minimize the decrease in strength of the warp threads when they are bent or abraded by the heddles.

■ In the warping process. To reduce the decrease in the strength of a thread when it is rubbed by a guide or tensor.

■ Minimize the decrease in strength due to thread rubbing during weaving.

As a result, by applying the specific oil agent mentioned above. These requirements are met and thread breakage and fuzz are prevented.
They discovered that the weavability was improved and arrived at the present invention.

In the present invention, the PO/EO copolymer-based polyether compound (a+ component) has the function of preventing strength reduction due to friction between thread and guide, thread and metal, and thread and thread, and has the function of preventing strength reduction due to friction between thread and guide, thread and metal, and thread and thread, and is a compound that prevents strength reduction due to friction between thread and guide, thread and metal, and thread and thread. The weight ratio of
j 40-20: It is necessary to be a random copolymer of 80 and have an average molecular weight of 4000-10000, and it is necessary to mix 20-50% by weight of this in the oil agent. Propylene oxide ratio is 60%
When this ratio exceeds 20% by weight, the viscosity becomes high, resulting in poor smoothness and a decrease in strength.On the other hand, when this ratio is less than 20% by weight, the viscosity becomes low and the cushion-like effect is lost. Similarly, it causes a decrease in strength. Furthermore, if the molecular weight of the polyether compound is less than 4,000 or the blending amount is less than 20% by weight, the viscosity of the oil agent as a whole decreases. The above-mentioned cushioning effect disappears, and conversely, if the molecular weight exceeds ioooo or the blending amount exceeds 50% by weight, the viscosity of the oil as a whole becomes high, and the thread, guide, and metal. FJ friction between threads causes a decrease in strength. Furthermore, the ability of the yarn surface oil to be removed by water is greatly influenced by the molecular weight of the polyether. Molecular weight is 4000
If it is less than that, most of the oil will fall off due to water. On the other hand, as the molecular weight increases, it becomes more likely to fall off. As mentioned above, it is preferable to set the value to less than 10,000, since it is not preferable to make the value too high in terms of smoothness and strength deterioration.

next. The fatty acid ester of component (b) acts as a smoothing agent, and it is necessary to blend 20 to 40% by weight of the fatty acid ester represented by the above formula. When the number of carbon atoms in a fatty acid ester increases, its viscosity increases, resulting in poor smoothness and difficulty in forming an emulsion with water. In addition, if the number of carbon atoms is small (low molecular weight), it may decompose during drawing or heat treatment, or after being attached to the thread, it may decompose over a long period of time, resulting in low molecular weight oils that may have adverse effects on the thread, such as swelling. This is not preferable because it causes a decrease in strength. Also,
If the amount of fatty acid ester blended is less than 20% by weight, the smoothness will be insufficient. If it exceeds 40% by weight, it is not preferable because the characteristics of the polyether compound cannot be exhibited.

In addition, the nonionic surfactant as component (C) acts as an emulsifier to turn the smoothing agent into an aqueous emulsion, and also has the effect of preventing strength reduction due to friction between threads. ) to (d) are expressed as 10
It is necessary to mix up to 30% by weight.

Finally, component (d) is an antistatic agent that prevents static electricity from charging the yarn and makes it easier to handle each yarn. Sulfonate Na salt, phosphate K salt, etc. are used, and the amount of the antistatic agent is determined by the amount. A suitable amount is 3 to 13% by weight, which does not impair the effects of components (a) to (C).

In addition to the components (a) to (d), the spinning oil in the present invention may also contain adjusting agents for increasing the compatibility of each component and adjusting the pH, such as ethylene glycol and propylene glycol. A small amount of a lower alcohol such as, a weakly acidic substance such as oleic acid, a weakly basic substance such as Na oleate, etc. may be blended.

As a method for applying the oil in the present invention, a roller oiling method or a slit oiling method is usually adopted as an aqueous emulsion.

In addition, the amount of oil applied needs to be 0.5 to 1.3% by weight, and if this amount is too small, problems will occur during stretching. Yarn breakage and fuzz occur frequently during warping and weaving, and conversely, if there is too much yarn, it becomes difficult to entangle when applying entanglement after drawing, and W
This is not preferable since excessive oil is scattered during weaving by JL and may contaminate the reeds and the like.

In addition, the entanglement process is usually performed after stretching, and the degree of entanglement is 3.
It is processed so that it becomes 0 pieces/m or more.

In addition. As the polyester in the present invention, polyethylene terephthalate and various copolyesters mainly composed of polyethylene terephthalate are used. Specific examples of copolymer components include:
Examples include isophthalic acid, 5-sodium sulfoisophthalic acid, adipic acid, sebacic acid, diethylene glycol, neobentyl glycol, and the like.

(Example) Next, the present invention will be specifically explained using examples.

Note that the characteristic values in the examples were measured by the following method.

・(OPU) Extract the oil adhering to the thread with n-hebutane, and
- Calculated by evaporating heptane to dryness and measuring the weight of the oil.

The flow rate was also measured according to the method described in US Pat. No. 2,985,955.

The measurement was performed using Tensilon UTM-4-100 manufactured by Orientic Co., Ltd., with a sample length of 500 mm and a tensile speed of 500 mm/min.

Using the equipment shown in Fig. 1 of Tsuru 1r Taku 81 Tohen, the supply tension was 20 g, and the yarn speed was 20.
After rubbing the yarn at 0 m/min, the strength and elongation was measured.

Using a μ-meter manufactured by Watanabe Sokki Co., Ltd., thread speed 200 m/min, friction body 16 mmφ black l, satin finish bottle, contact angle 90 degrees,
Measured with T+=20g.

Using the apparatus shown in Figure 2, the yarn speed is 200 m/min, 30 m/min.
The OPU was measured after passing through water at °C.

/ Rubbing (F/F Rubbing) Using the apparatus shown in Fig. 3, the threads were rubbed at a load of ioo g, three twists, and a speed of 100 strokes/min, and the number of times until the threads were cut was measured.

Using the model device shown in Figure 4 with a reed of 1111 degrees and a yarn speed of 100 m/min,
After rubbing the knitting needles with the yarn for 60 minutes at a supply tension of 20 g, the wear status of the knitting needles was observed and evaluated in the following three stages.

○: Almost no wear, △: Slight wear, ×: Significant wear.

In addition. In Figures 1-4. Y is the measuring yarn, 1 is the drawing yarn burn, and 2 is the tension adjuster. 3 is a satin finish bin, 4 is a take-up roller, 5 is a winder, 6 is a water bath, 7 is a load, 8.9 is a free roller, 10 is a yarn fixing device, and 12 is a knitting needle.

Examples 1 to 4, Comparative Examples 1 to 3 Polyethylene terephthalate was melt-spun by a conventional method, and a 12% aqueous emulsion liquid having the composition shown in Table 1 was applied to the spun yarn using a roller lubrication method. Adhesion amount is 0.
The concave rotation speed of the roller was changed so that the amount was 9 to 1.1% by weight. An undrawn yarn was obtained.

Table 1 In Table 1, the amounts of oil components are in parts by weight.
The numbers in parentheses after PO/EOO are 5 copolymer weight ratios,
Mw is the molecular weight, and PEG (400) is polyethylene glycol with a molecular weight of 400. POE (5) means polyoxyethylene with a degree of polymerization of 5, and EG means ethylene glycol.

This undrawn yarn was stretched by a conventional method, and immediately after stretching, it was subjected to an intertwining treatment, and the degree of entanglement was 40 to 50 pieces/m, and 50 d/1
A drawn yarn of 8 f was obtained.

The properties of this drawn yarn are shown in Table 2.

As is clear from Table 2, the yarns obtained in the examples of the present invention have smoothness (coefficient of friction against metal), degree of strength reduction due to thread-to-metal rubbing, and degree of yarn breakage due to thread-to-thread rubbing. (F/F rubbing property), degree of shedding of oil by water. It can be seen that the reeds are excellent in all aspects of wear.

Table 2: On the other hand, with the yarn of the comparative example, the rotation speed was 700 rpm.
It can be seen that the weaving performance becomes extremely poor as the weaving speed increases.

next. This yarn was used as the warp yarn under the same conditions without twisting or sizing. Table 3 shows the results of weaving using WJI:ZW-303 manufactured by Tsudakoma Co., Ltd. at a rotation speed of 50 rpm and 700 rpm+.

As is clear from Table 3, the yarn using the spinning oil of the present invention has excellent weavability at both the weaving speeds of 500 rPm and 700 rpm.

(Effects of the Invention) According to the present invention, due to the synergistic effect of application of a specific oil and entanglement, it is possible to produce polyester yarn that does not generate fuzz or yarn breakage even when woven at high speed WJL in a non-sizing state. Become.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams of an apparatus for measuring the characteristic values of yarn in Examples. Figure 1 shows the abrasion device used to measure strength and elongation after abrasion. Figure 2 shows an oil removal device for measuring the degree of removal of oil from water. Figure 3 shows F'/F
Apparatus for Measuring Rubbing Properties FIG. 4 shows an apparatus for measuring the degree of wear of reeds. Patent applicant Nippon Ester Co., Ltd.

Claims (1)

[Claims] (1) When producing polyester multifilament yarn, add 0.5 of an oil agent having the following composition to the melt-spun yarn.
A method for producing a polyester yarn for glueless weaving, characterized by adhering ~1.3% by weight, and subjecting it to stretching and entangling treatment. (a) A polyether compound in which propylene oxide and ethylene oxide are randomly copolymerized at a weight ratio of 60:40 to 20:80 and whose average molecular weight is 4,000 to 10,000 20 to 50% by weight (b) Fatty acid represented by the following formula Ester 20-40% by weight R^1COOR^2 (R^1 is an alkyl group or alkenyl group having 7 to 20 carbon atoms, R^2 is an alkyl group or alkenyl group having 5 to 18 carbon atoms.) (c) 10 to 30% by weight of nonionic surfactants represented by formulas (a) to (d) (a) R^3COO(CH_2CH_2O)_nH (b) R^4COO(CH_2CH_2O)_nOCR
^5 (c) R^6O(CH_2CH_2O)_nH (d) R^7O(CH_2CH_2O)_nR^6 (R^3 to R^6 are alkyl or alkenyl groups having 8 to 18 carbon atoms, n is 4 to An integer of 20.) (d) Antistatic agent 3 to 13% by weight