JPS60231826A - Production of polyester fiber for false twisting - Google Patents

Abstract

PURPOSE:Polyester is melt-extruded into fibers, solidified by cooling and treated with a specific finishing oil, before the fibers come into the roller regulating the yarn speed, then the yarn is wound up over a certain speed, thus giving a yarn with reduced yarn breakage and fluffs. CONSTITUTION:Polyester is melt-extruded into fibers and the fibers are solidified by cooling with air. Then, the yarn is treated with a finishing oil containing more than 10wt% of at least one of copolymers represented by the formula [R1 is 1-6C hydrocarbon, R2 is methyl, ethyl; X and Y are 0 or positive integers satisfying the equation Z(58X+44Y)>=1,000: Z is integer 1-6 corresponding to the valency of R1] by means of a metric pump by 0.2-2.0wt% based on the yarn weight. Then, the yarn is take up at a speed over 2,500m/min to give the objective polyester yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing polyester fibers suitable for false twisting by a high-speed spinning method. More specifically, by applying a specific oil agent during high-speed spinning, polyester fibers for false twisting do not generate fuzz during the spinning process, and also have less smoke, tar, and shedding of white powder on hot plates during false twisting. The present invention relates to a manufacturing method.

[Prior art and its problems]

In recent years, with the increase in the speed of false twisting machines, smoke generation and tar on the hot plate have increased during false twisting, making it impossible to maintain uniform crimp characteristics and stable operability. Various studies have been carried out. During these studies, mineral oil, which had been used in the past, was found to be less likely to turn into tar due to its tendency to gradually thermally decompose, lower its molecular weight, and volatilize in response to heat treatment.
Polyethers that generate less smoke than fatty acid esters, that is, various alcohols, ethylene oxide (hereinafter abbreviated as EO), and/or propylene oxide (hereinafter referred to as PO)
A copolymer compound (hereinafter simply referred to as polyether) synthesized by addition polymerization of polyether (hereinafter simply referred to as polyether) has been discovered. For example, JP-A-48-98194 and JP-A-48-99493.
The publication discloses the use of polyether as an oil agent for raw yarn for false twisting. It is true that if polyether is used, the problem of tar and fuming will be improved. However, yarns coated with an oil agent mainly composed of polyether
Compared to conventionally used oils mainly composed of mineral oils and fatty acid esters, in the yarn-metal dynamic friction spinning method, the yarn is more easily damaged by abrasion by guides, such as yarn convergence guides and take-up traverse guides. The effect of yarn damage is large. Here, an oil agent with a high sf mμd increases the degree of scratching, and increases the occurrence of yarn breakage and fuzz (single yarn breakage of multi-yarn threads).

In addition, during false twisting, problems such as the generation of white powder, especially on guides and hot plates, arose, posing new problems with the raw yarn oil for processing.

[Objective of the Invention] The object of the present invention is to obtain a spinning oil suitable for obtaining polyester fibers for false twisting by a high-speed spinning method with a winding speed of 3000 m/min or more, that is, a false twisting process possessed by polyethers. It maintains good false twisting characteristics such as smoke generation and tarring characteristics, and at the same time satisfies low f-mμd characteristics that enable stable high-speed yarn spinning. The purpose of the present invention is to provide polyester fibers to which an oil agent is applied that can reduce the generation of white powder.

The inventors of the present invention conducted extensive studies on the frictional properties of the polyethers mentioned above and found that the contribution of polyether end groups to the frictional properties is extremely large. In other words, ordinary polyethers synthesized by addition polymerization of KOLPO to various alcohols always have OH groups as terminal groups, but terminal alkyl etherified polyethers in which these terminal OH groups are blocked by an alkyl etherification reaction have terminal OH groups. They discovered that f-rnpd was significantly lower than that of polyether before group-blocking, leading to the present invention.

[Structure of the invention]

The object of the present invention described above is to melt-spun polyester, cool it, assimilate it, and then supply oil before entering the spinning speed regulating roller to produce polyester fibers. When an oil agent containing 10% of seeds or more is applied to the oil by 0.2% to 2.0% (relative to the weight of the fiber), it can be wound up with a preparative rate of ###m/min or more for both t00. This can be achieved by the method for producing polyester fibers for false twisting.

R+ (0(OsH60)z ・(02H40)YR2
)z --fll (However, R+ is a monovalent to hexavalent hydrocarbon group, R2 is a methyl group or an ethyl group. Also, X and Yti, 0 or a positive integer satisfying Z(58X+44Y)>1000 2 is an integer from 1 to 6 corresponding to the valence of R1.) The most important feature of the present invention is the specificity of the compound represented by the general formula [1), that is, the terminal-capped polyether described above. The point is to use an oil agent with the right amount.

The polyether represented by the general formula (11) has 1 to 1 in the molecule.
Compounds containing 6 OH groups have KO and/or p
Terminal OH of polyether synthesized by addition polymerization
The group is further alkyl etherified and blocked by an alkyl etherification reaction. Mono- to hexavalent aliphatic or aromatic alcohols are suitable as the OH group-containing compound used in general formula Methylolpropane, glycerin, pentaerythritol, dipentaerythritol, sorbitol, alkylphenol and the like can be mentioned. Also, OH in a broad sense
Fatty acids such as lauric acid, oleic acid and ricinoleic acid can be used as group-containing compounds. Among the above-mentioned OH group-containing compounds, mono- to hexavalent aliphatic alcohols are particularly preferred in consideration of their influence on tar formation, and mono- to hexavalent aliphatic alcohols are particularly preferred;
Among the hexavalent aliphatic alcohols, those having 16 or less carbon atoms are preferred, and those having 12 or less carbon atoms are most desirable in terms of tarring, smoke generation, and white powder.

EO, P in the polyether represented by the above formula (11)
The form of addition polymerization of O may be random polymerization or block polymerization. Further, the addition molecular weight of EO and PO must satisfy Z(58X+44Y)>1000. Furthermore, z (58X+44Y
) is go, p added to one molecule of an OH group-containing compound.

In reality, the added molecular weight of EO/PO has a certain distribution, so in that case it means the average added molecular weight. Z(58X+44Y
) is less than 1000, smoke generation increases due to the low molecular weight, and furthermore, the influence of R1, which is the starting OH group-containing compound residue in the molecule, increases, making it easier to tar, making it impossible to obtain satisfactory heat resistance. do not have. On the other hand, EOlpo
Although the upper limit of the added molecular weight is not particularly limited, it is particularly preferable to set it to Z (58

Furthermore, there is no particular restriction on the addition ratio of EOlpo, but if the ratio of EO is too high, it tends to worsen taring, and even if the ratio of PO is too high, f-mμd tends to increase, so uo/po addition The ratio is 80/20~1
A weight ratio of 0/90 is particularly desirable.

For example, Willi et al.
The ameOn ether synthesis reaction can be employed.

As the alkyl group for the alkyl etherification reaction represented by R2 in the general formula Ill, a methyl group or an ethyl group is selected for the following reason. In other words, as the number of carbon atoms in the alkyl group increases, it tends to have a negative effect on the tar-forming properties compared to the polyether before the alkyl etherification reaction, and also reduces the reactivity of the alkyl etherification reaction.
Since the group blocking rate decreases, it is necessary to use a methyl group or an ethyl group, and a methyl group is particularly desirable.

In addition, as a method for blocking the terminal OH group, esterification reaction of various carboxylic acids with the terminal OH group can be considered, but the tarring properties are greatly deteriorated due to the terminal esterification, and the terminal O
The effect of lowering /-mμd due to H group blocking is also much smaller than that of terminal alkyl etherification blocking, and therefore the object of the present invention cannot be achieved.

The polyester in the present invention is mainly a polyester having ethylene terephthalate as a main repeating unit, but may also be a polyester having butylene terephthalate as a repeating unit. It may also be a polyester polymer containing a polyester copolymerized with one or more other components in an amount of 15 molar or less and a small amount of additives.

In addition, the amount of the polyether represented by the general formula (Il) in the oil agent of the present invention must be 10% by weight or more,
Furthermore, in order to exhibit a sufficient effect, it is more preferable to use a weight factor of 25 or more. Other smoothing agents and various activators can be used in combination as long as they do not cause any damage.

As the smoothing agent, the combination of polyethers represented by the following general formula (Ill) is particularly suitable for solving the above-mentioned problems of smoke generation during false twisting and tar on the hot plate.

R'(0(03H60)m・(C!2H40)nH)4
... - (Ill (However, R' is a mono- to hexavalent hydrocarbon group.

m and n are 0 or positive integers, and l is an integer from 1 to 6 corresponding to the valence of R'. ) Other combination smoothing agents include various carboxylic acid esters, such as oleyl oleate, oleyl laurate, butyl stearate, i-propyl-myristate, dioleyl adipate, trioctyl trimellitate, trimethylolpropane, trilaurate, and lauryl. (KO)n octanoate, trimethylolpropane distearate EO adduct, and the like. In addition, various activators include anionic agents such as alkyl sulfonate metal salts, alkyl sulfate metal salts, alkyl phosphate metal salts, -alkylene oxide adducts, and fatty acid soaps;
and various nonionic activators such as higher alcohol ethylene oxide adducts and polyhydric alcohol partial ester ethylene oxide adducts.

The oil containing the above-mentioned components is usually applied to the fibers as an aqueous emulsion, but it may also be applied as a non-aqueous emulsion by straight oiling. Lubricating is performed by a roller touch method or a metering pump method after the polyester is melt-spun, cooled and solidified, and before entering the spinning speed regulating roller.

The amount of the oil agent attached to the yarn is 0.2 to 2.0% by weight.
% by weight (relative to the weight of the fiber), and the amount of adhesion must be 2.
If it exceeds 0% by weight, smoke and tar will increase on the false twisting hot plate, and if it is less than 0.2% by weight, the sfmμd will increase and the cohesiveness of the multi-yarn will be insufficient, so the desired effect will not be achieved. I can't get it. Furthermore, as the amount of adhesion, the winding speed is 45
If the winding speed is less than 00 m/min, a weight ratio of 0.4% to 0.8% is more preferable, and if the winding speed is higher than 4500 m/min, uniform adhesion becomes more difficult and the degree of friction with guides increases. More preferably 0.6% to 1.5% by weight.

〔Effect of the invention〕

Polyester fibers obtained by spinning at a high speed of m/min or higher have fewer yarn breakages compared to conventional oil-applied polyester fibers, and significantly reduce the fuzz inherent in the spun yarns. be able to. In particular, the effect is more remarkable when the winding speed is 4500 m/min or more. In addition, when the resulting yarn is false-twisted, it is possible to obtain a crimped yarn with excellent process and physical properties, such as very little smoke and tar formation on the hot plate, and significantly reduced generation of white powder. .

The present invention will be explained in more detail with reference to Examples below.O Examples 1 to 4. Comparative Examples 1 to 4 [η) = 0.65 polyethylene terephthalate was melted at 290°C, and 47. After extruding the yarn at a rate of 0.3 oz/min and cooling it with cold air, 1.0% by weight (weight ratio of the fiber) of the oil agent of the present invention was applied to the yarn using a metering pump type device.
75Di 36f is obtained by the direct spinning drawing method, which takes it up by a spinning speed regulating roller with a circumferential speed of 5000 m/min, then guides it to a stretching roller rotating at a circumferential speed of 6250 m/min, and winds it up at 6100 m/min after stretching. multifilament was obtained. Silk spinning status at this time (thread breakage count/ton)
After winding, unwind the drawn yarn and measure the number of fluff using a fluff detector (manufactured by Toshi, Toshi BP 'RA Y COUNTERDP).
104, measurement speed 1 oom/min).

The drawn yarn was heat treated at a temperature of 220°C and a processing speed of 4oom/
False twisting was carried out for 7 days, and the processing conditions at this time are shown in Table 1.
It was shown to.

It is clear from Table 1 that in Examples 1 to 4 using the oil agent of the present invention, yarn breakage during yarn spinning, number of drawn yarn fluffs, and generation of smoke, tar, and white powder during false twisting; 1 deviation was also good. In comparison, in Comparative Example 6.4, which used an oil agent other than the present invention, yarn breakage occurred during spinning, fuming during false twisting, and tar stains on the hot plate although the drawn yarn had slightly less fuzz. Also, Comparative Example 1.2 had thread breakage during spinning.

There was a lot of fuzz, and the polyester fiber was not satisfactory (continuous processing was not possible).

Examples 5-8. Comparative Examples 5 and 6 [Polyethylene terephthalate with ηJ = 0.65 was
The yarn is melted at 8° C. and extruded at a rate of 1 osg/min through a nozzle having 48 holes with a diameter of 0.311 Iφ. After cooling with cold air, the yarn is lubricated with the lubricant of the present invention using a metering pump method. After applying 1.0 weight coefficient c to fiber weight ratio) with the device,
The circumferential speed of the spinning speed regulating roller was set to 6,000 m/min, and half a rotation was lost to the 20th roller rotating at the same speed.
It was wound up at 6,000 m/min to obtain a 150D-48f multifilament. Table 2 summarizes the spinning state at this time and the state when false twisting was performed using the same drawn yarn. As is clear from Table 2, Examples 5, 6, and 7 using the oil agent of the present invention had good results with fewer yarn breakages and fuzz during yarn spinning, smoke generation during false twisting, tar staining, and white powder generation. The results were good with little deviation. In addition, in Example 8, as a result of limiting the blending of the polyether component to 20% by weight, some smoke generation during false twisting and tar staining on the hot plate were observed. Comparative Examples 5 and 6 had a large number of fuzz pieces per yarn breakage during yarn spinning (continuous false twisting was not possible).

Examples 9-11. Comparative Example 7.8 Polyethylene terephthalate with [η) = 0.65 2
The yarn is melted at 90°C and extruded at a rate of 408/min through a nozzle having 36 holes with a diameter of 0.3 mm. After cooling with cold air, the oil agent of the present invention is applied to the yarn using a metering pump method. After applying 0.8% by weight (weight ratio to fiber) with a lubricating device of 3.0
The yarn was wound at a spinning speed of 00 m/min to obtain 7556 undrawn multifilament yarns. The yarn spinning state and number of fuzz at this time are summarized in Table 5. In addition, the undrawn yarn was subjected to simultaneous stretching and false twisting, and the smoke generated during false twisting and the appearance of tar stains on the hot plate were also reported in False 3. The temporary twisting processing conditions were a stretching ratio of 1.63.

These are the results of seven consecutive days of simultaneous stretching and false twisting at a hot plate temperature of 220° C. and a processing speed of 400 m for 7 minutes.

Table 3 As is clear from the results in Table 3, Examples 9% and 10 using the oil agent of the present invention had fewer yarn breakages during yarn spinning, fewer fluffs in the undrawn yarn (and fewer smoke generation during false twisting, and fewer fluffs on the hot plate). A remarkable effect was confirmed, with less tar stains, guides, and white powder on the hot plate.Example 10 has the same oil composition as Example 3, but contains a higher amount of fatty acid ester component. Some smoke generation and tar staining were observed during the twisting process. - However, Comparative Examples 7 and 8 were not satisfactory in both the spinning state and the processing state.

That is, in Comparative Example 7, thread breakage occurred frequently during spinning, and the number of undrawn yarn fuzz was greater than in Examples 9, 10 and 11, which was not at a satisfactory level.

Comparative Example 8 had a small number of yarn breakage and fuzz during yarn spinning, but a lot of smoke and tar staining during false twisting (defects were observed).

Patent applicant: Toshi Co., Ltd.

Claims (1)

[Claims] When producing polyester fibers by melt-spinning polyester, cooling and solidifying it, and supplying oil before entering the spinning speed regulating roller, one of the copolymers represented by the following general formula (, 1) or 0.2% by weight of oil containing 2 or more types at 10% by weight or more
A method for producing polyester fibers for false twisting, characterized in that the polyester fibers are given a weight factor of ~2.0 (relative to λ t OQ fiber weight) and are wound at a winding speed of 7 minutes or more. R+(0(OsH60)z・(C!2H40)y R2
)Z -fll (wherein, R+ is a monovalent to hexavalent hydrocarbon group, and R2 is a methyl group or an ethyl group.
and Y is 0 or a positive integer satisfying Z(58X+44Y)>1000. Further, 2 is an integer from 1 to 6 corresponding to the valence of R1. )