JPS6254910B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention mainly relates to a lubricant for high-speed drawing friction false twisting of polyester fibers, and more specifically, it is obtained as a uniform crimped yarn with hardly any heater stains observed during high-speed drawing friction false twisting.
The present invention relates to an oil agent for producing processed yarn, which can provide knitted fabrics and woven fabrics with excellent uniformity, and in particular to an oil agent for high-speed stretching and false twisting. Methods for obtaining processed polyester fiber yarns include a method in which undrawn yarn after spinning is temporarily turned into a drawn yarn and then false-twisted; and, with recent advances in DTY technology, drawing and false-twisting can be carried out simultaneously or continuously from a spun yarn. There are many ways to do this, and the latter is the most common. and,
The spindle false-twisting method and the friction false-twisting method have been adopted as methods for applying such stretch false-twisting, and in particular, by adopting the friction false-twisting method, the processing speed can be increased from 400 to 400.
Speeds are rapidly increasing to 1000m/min. However, as the processing speed increases, the friction between the yarn and various contacting bodies (for example, guides, rollers, heaters) increases, resulting in an increase in the occurrence of fuzz and yarn breakage due to damage to the fibers. On the other hand, due to the increase in the false twisting speed, the heater is significantly contaminated with conventionally well-known processing agents, and in extreme cases, tar and sludge residue (hereinafter abbreviated as scum) can be formed on the heater. The occurrence of fuzz and thread breakage increases. Furthermore, it causes the occurrence of abnormal crimping and dyeing spots, and the generation of streaks on the weft rows of knitted fabrics and woven fabrics.
Therefore, production must be stopped and the heaters must be cleaned frequently, resulting in poor operability. Recently, heat-resistant oils have been studied, and various oils based on polyether compounds have been proposed. When polyester multifilament yarns coated with a treatment agent containing polyether as a main component are subjected to high-speed friction false twisting, good results can be obtained against heater stains, but as the treatment time progresses, fluffing may occur. The occurrence of suture breakage is increasing. This causes crimp abnormalities and dyeing spots, and causes streaks in the weft rows of knitted fabrics and woven fabrics. In order to solve these problems, the present invention has been made through extensive research, and it has been discovered that it is possible to obtain a textured yarn with less heater stains, less fluff and yarn breakage, and a uniform crimpability without weft steps. It is something that That is, the present invention has a birefringence index (Δn) of 0.02 to
This invention relates to an oil agent for high-speed friction false-twisting that does not have the various disadvantages mentioned above when friction-false-twisting polyester undrawn multifilaments of about 0.08 in diameter at high processing speeds of several hundred to 1000 m/min. It is something. The origin of the present invention lies in an attempt to prevent the above-mentioned drawbacks of polyether compounds used as oil agents for high-speed friction false twisting. A remarkable effect was found by blending component (c). (b) PO/polyhydric alcohol added with block or random copolymer of ethylene oxide (EO) and propylene oxide (PO)
Comprised of one or more compounds with a molecular weight of 1000 to 7000 with an EO (molar ratio) of 40/60 to 90/10 and all terminals blocked by ether bonds with alkyl groups having 1 to 12 carbon atoms. 20 to 99% by weight (b) 0.2 to 5% by weight of modified silicone with a viscosity of 100 centipoise or more at 30°C (c) 0.1 to 5% by weight of a salt of a carboxylic acid having 1 to 5 carbon atoms. The roles of essential components (a) to (c) and the basis for selecting them will be explained. (A) improves the smoothness of the yarn, reduces fuzz and yarn breakage during high-speed friction false twisting, reduces crimp abnormalities, and provides processed yarn with fewer weft rows in knitted fabrics and fewer streaks in woven fabrics. It will be done. Also, there is very little dirt on the heater, which is good. The polyhydric alcohol of compound (a) in the present invention is a sorbitan-based or sorbitol-based polyhydric alcohol, pentaerythritol, trimethylolpropane, etc. Compound (a) is a polyhydric alcohol containing ethylene oxide (EO) and Propylene oxide (PO) is added, and the bonding state of the compound (a) may be block polymerization or random polymerization, but all the terminals of the copolymer are alkyl groups, especially carbon atoms 1 to reduce friction. The ether bond must be blocked by ~12 alkyl groups. Here, if the end is not sealed, it is unsuitable because it has the disadvantage of high friction. and,
The reason for setting the PO/EO (mole ratio) to 40/60 to 90/10 is to reduce heater contamination, and compounds (a) with a molecular weight of less than 1000 are preferable for fluid lubrication, such as with metals, but are thermally stable. It is not preferable because it has poor properties and, on the other hand, the rubber swelling property deteriorates. If the molecular weight exceeds 7000, friction will increase, making it unsuitable.On the other hand, the coefficient of static friction between fibers becomes extremely low, resulting in poor winding shape, which is disadvantageous as it causes yarn breakage during high-speed friction false twisting. . but,
7000 or more may be used in combination in an amount of 2 to 3% by weight or less. In addition, those having a molecular weight of 2,000 to 7,000 in particular protect the yarn surface by strengthening the oil film, and as mentioned above, have good smoothness due to all end-blocking, and are extremely effective in preventing fluffing during high-speed friction false twisting. At this time, if the number of carbon atoms in the terminal block exceeds 12, it is likely to cause contamination of the heater, so it is preferably 1 to 12 carbon atoms. The blending ratio of compound (a) in the entire oil agent is preferably 20 to 99% by weight as the total amount of one or more compounds (i). In (b), the polyether compound in (a) above is not sufficient to prevent heater stains, and in order to significantly improve heater stain prevention with high-speed friction false twisting, modified silicone with a viscosity of 100 centipoise or more at 30°C is used. They are used together. And its viscosity is 100
If it is less than centipoise, there will be a large amount of scattering on the heater, and the effect of preventing heater stains will not be sufficient. Examples of the modified silicone include silicone modified with polyglycol modification, higher alcohol modification, fatty acid modification, polyoxyethylene modification, polyether modification, and the like. The blending ratio of compound (b) to the entire oil agent is preferably 0.2 to 5% by weight. (C) has the effect of preventing the accumulation of scum on the heater. Examples of the salts of carboxylic acids having 1 to 5 carbon atoms include salts of monocarboxylic acids having 1 to 5 carbon atoms, general formula R-COOM (M=alkali metal, ammonium, amine), and dicarboxylic acids having 1 to 5 carbon atoms. Mention may be made of salts of acids with the general formula MOOC-R-COOM. The blending ratio of compound (c) to the entire oil agent is preferably 0.1 to 5% by weight. In the present invention, an oil composition containing these three components in a predetermined ratio (100% by weight in total) is used with a viscosity of 20 to 60 centipoise at 75°C. The oil agent according to the present invention is applied to undrawn yarn by 0.2
By adding approximately 0.7% by weight, high-speed friction false twisting results in less fuzz and yarn breakage, no crimp abnormalities, and uniform knitted fabrics with no weft rows or streaks on woven fabrics. Processed yarn is obtained. It should be noted that several percent of alkyl sulfonate salts and alkyl phosphate salts, which are generally known for antistatic purposes, may be blended into the oil agent of the present invention. The above-mentioned oil agent of the present invention can be used for purposes other than the present invention, for example, as a treatment agent for spindle-type false-twisting yarn, a yarn treatment agent for spinning and drawing synthetic fibers, and still have some effects. The present invention will be explained below using Examples and Comparative Examples. Examples 1 to 5 and Comparative Examples 1 to 4 Polyethylene terephthalate was prepared by a conventional method.
Spinning at a spinning speed of 3300 m/min, oil composition A~
I was separately applied to the multifilament with an oil adhesion target of 0.5% by weight (Table 1). The obtained 120 denier/36 filament undrawn yarn was stretched using a friction false twisting machine equipped with a urethane rubber disc at a stretching ratio of 1.6 times, a heater temperature of 220°C, a friction disc rotation speed of 8500 rpm, and a processing speed of 700 m/min. At the same time, frictional false twisting was performed. Continuous operation was carried out for 30 days each, and the drawing false twist properties (fuzz, yarn breakage, occurrence of heater scum, crimp properties) and the resulting false twisted yarns were dyed and finished as knitted fabrics to investigate the occurrence of weft steps. (Table 2). Among these oils, oils A to Examples 1 to 5
E is a representative oil agent of the present invention among various studies, and oil agents F to I of Comparative Examples 1 to 4 were inferior in some respects. The results of these experimental examples will be discussed below. (1) Oils A, B, C, D, and E are the oils of the present invention, which cause less occurrence of false twist yarn fluff and false twist breakage, almost no heater stain, and improved crimpability and weft row of knitted fabrics. Good results were obtained. (2) Oil agent F was mainly composed of polyether with all ends capped, but instead of using the modified silicone and carboxylic acid salt of the present invention, a commonly known alkyl sulfonate was used. The results showed that the results were good at the beginning of false twisting, with no fuzz, no yarn breakage, and no weft steps observed. However, as the number of days of false twisting increased, heater scum and oil drops increased, and crimpability also increased, resulting in poor knitted fabrics. Streaks appeared in the fabric. (3) Oil agent G is mainly made of polyether with all ends blocked, and uses the modified silicone and carboxylic acid salt of the present invention, but due to the increased viscosity of the oil agent, the false-twisted yarn is fluffy due to lack of smoothness. The number of occurrences of breakage and false-twisted yarns increased, and on the other hand, poor crimp and weft rows of knitted fabrics occurred. (4) Oil agent H is an end-capped polyether, but as a result of blending a large amount of low molecular weight polyether (MW500), heater stains worsen in a short period of time, and the false-twisted yarn fuzz and false-twisted broken yarn become heater stains. It increased rapidly. At the beginning of false twisting, the crimpability and the weft row of the knitted fabric were good, but as the heater stain worsened, the crimpability became more uneven, and streaks appeared in the knitted fabric or woven fabric. (5) As a result of using Oil I as a compounded oil mainly composed of a generally known polyether compound, the occurrence of false twist yarn fuzz and false twist breakage due to lack of smoothness increased, and on the other hand, it caused poor crimping and knitting. A geolatitudinal step occurred.

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Claims (1)

[Scope of Claims] 1 Consists of a mixed composition of the following compounds (a) to (c),
An oil for friction false twisting characterized by a viscosity of 20 to 60 centipoise at 75°C. (b) PO/polyhydric alcohol added with block or random copolymer of ethylene oxide (EO) and propylene oxide (PO)
Comprised of one or more compounds with a molecular weight of 1000 to 7000 with an EO (molar ratio) of 40/60 to 90/10 and all terminals blocked by ether bonds with alkyl groups having 1 to 12 carbon atoms. 20 to 99% by weight of (b) 0.2 to 5% by weight of modified silicone with a viscosity of 100 centipoise or more at 30°C (c) 0.1 to 5% by weight of a salt of a carboxylic acid having 1 to 5 carbon atoms