JPS6081374A - Oil agent for elastic yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a lubricant for elastic threads.

More specifically, the adhesiveness between elastic yarns, especially between polyurethane elastic yarns, is low and the unwinding property is excellent, and the frictional resistance is always small regardless of the running speed of the elastic yarns. This relates to an oil agent for obtaining elastic fibers with a low production rate (in which oligomers in the system extracted by the components and solid or high viscosity components in the oil agent are separated in the form of a solid or paste).

Elastic yarn has a lower Young's modulus than other clothing fibers and is extremely stretchable, so the frictional resistance with guides and the like during post-processing steps such as warping and knitting must be particularly small. In addition, since the threads are highly adhesive, unless an oil agent with anti-adhesive properties is applied, the threads will stick to each other on the cheese, resulting in poor unwinding properties, resulting in frequent thread breakage in the post-processing process. There is. Therefore, it is important to reduce the frictional resistance of the yarn (improve the so-called smoothness) and further improve the unwinding property.For this purpose, elastic fibers require a considerably larger amount of oil during the spinning process than other synthetic fibers. Usually, it is given. Particularly in recent years, polyurethane elastic fibers are also available at 400~
Because it is used at a high speed of 800,772/min,
There is a demand for particularly low frictional resistance during high-speed running.

However, if the oil adhesion rate is high, a large amount of oil and scum will adhere to the guides and knitting needles of the knitting machine that the yarn comes into contact with, resulting in product stains and clogging due to the adsorption of fluff, which often requires cleaning. It becomes necessary. It also has the disadvantage that oil seeps from the cheese or beam, contaminating equipment, machinery, etc.

Conventionally 1. In order to reduce the stickiness and frictional resistance of elastic yarns and to reduce the unraveling property between yarns, modified silicone such as polyether-modified silicone is mixed in a low viscosity diorganopolysiloxane such as 5 to 30 centistokes. It is also known from JP-A-57-128276 to use an oil agent in which a higher alcohol, a carboxylic acid ester of a higher alcohol, or the like is used as a co-solvent (referred to as a binder oil) and dispersed or dissolved therein. However, such oil agents also require a large amount of the binder oil to dissolve the polyether-modified silicone that is incompatible with the diorganopolysiloxane.
Moreover, if there is a large amount of binder oil, not only will a large amount of oligomer components in the system be eluted and cause scum to be generated, but the content of diorganopolysiloxane as a high-speed smoothing agent will be reduced accordingly, resulting in good smoothness. In order to obtain this, it is necessary to increase the amount of oil applied, which has disadvantages such as scum generation.

In view of the current situation, the present inventors have arrived at the present invention as a result of intensive research to develop a lubricant for elastic yarns that exhibits excellent effects with a small amount of lubricant application rate. i.e. 5
The present invention consists of a diorganopolysiloxane (a) having a viscosity of 5 to 30 centistokes at 25°C, a higher alcohol or its ether, or a carboxylic acid x methyl having 12 or more carbon atoms (b) * modified silicone (
C) and fatty acids having 8 or more carbon atoms and periodic table 1a
An oil agent containing as an essential component a salt (d) with a metal selected from Group II and Group III, wherein component (d) is contained in the oil agent in a finely dispersed state of 0.1 to 3% by weight. It is characterized by being done.

The oil agent of the present invention will be explained in more detail below.

The oil agent of the present invention contains the following four types of compounds as essential active ingredients.

(a) Diorganopolysiloxane with a viscosity (25°C) of 5 to 30 centistokes (b) Higher alcohol or its ether or carboxylic acid ester having 12 or more carbon atoms (C) Modified silicone, preferably viscosity (25°C) 5
0 to 5000 centistokes (d) Salt of a fatty acid having 8 or more carbon atoms and a metal selected from the group consisting of Groups Ia, Group II and Group M of the Periodic Table 1 as the diorganopolysiloxane (a) Dimethylpolysiloxane is preferred, but some of the methyl groups may be substituted with other monovalent organic groups such as alkyl groups and phenyl groups. The viscosity is 5 to 3 in terms of smoothness and uniformity.
0 centistoke (25°C) is used. Also, higher alcohol or its ether or carboxylic acid ester having 12 or more carbon atoms (b) + 1 component (c) O component is a medium that improves the dispersion solubility in component (a), that is, a binder oil, such as carbon Higher alcohols or ethers thereof having 12 or more atoms, preferably 12 to 20 atoms; 12 carbon atoms obtained from a carboxylic acid having 2 to 20 carbon atoms and a saturated aliphatic alcohol having 1 to 20 carbon atoms; The above esters are exemplified. More specifically, lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, heptadecyl alcohol, stearyl alcohol, eicosyl alcohol: rfx? K
Ry alcohols, ethers such as alkyl ethers of the alcohols, Improvil myristyrate.

Isopropyl palmitate, lauryl propionate,
Fatty acid varnish such as stearyl acetate 7/l/M
, 9-tyl benzoate, dodecyl benzoate,
Examples include aromatic carboxylic acid esters such as digtylphthalate, dioctyl phthalate, cytodecyphthalate, trigtyltrinolitate, and trioctyl trimellitate. but.

Particularly preferred are higher alcohols and fatty acid esters.

In addition, modified silicone (C) is a component that reduces the stickiness of yarn and improves the unwinding properties of wound yarn. Polyether-modified silicone with amino groups, carboxyl groups, and epoxy groups.

carbinol group, acyloxyalkyl group, halogenated alkyl group, aralkyl group, higher alcohol ester group,
Examples include modified organoboric T3 chitons having at least one type of mercapto group, alkyl ether group, etc. in their side chains, and those modified to the extent that they are insoluble in diorganopolysiloxane (a) are used. It is usually preferable that the proportion of the modifying group in the modified silicone is 10% by weight or more.

Particularly preferred modified silicones are polyether modified silicones. Diorganopolysiloxane (a) and modified silicone (C) are mixed uniformly and the above component (b) is used as a binder oil in order to make a stable oil agent, but it is preferable to use one that does not elute oligomers in the system, either alone or as a binder oil. It is appropriately used in combination with more than one species.

Since binder oil does not have a significant effect on reducing the frictional resistance of yarn and also has a small effect on improving unwinding properties, it is preferable to reduce the amount of binder oil in the oil as much as possible.
) and component (C) are preferably 40 to 90% by weight based on the oil agent. Moreover, the blending ratio of component (a) and component (c) is preferably 20 to 8o:1M. Component (C
) is too small, the smoothness during low-speed running becomes insufficient, and if -force component (C) is too large, even if component (b) is added, the compatibility of both components deteriorates. The proportion of component (C) in the oil agent is preferably 1 to 5% by weight.

In the oil agent of the present invention, the salt (d) of a fatty acid having 8 or more carbon atoms, preferably 8 to 22 carbon atoms, and a metal selected from the group consisting of Group Ia, Group II, and Group II of the Periodic Table includes capric acid. Examples include sodium, sodium laurate, lithium stearate, i-lead palmitate, magnesium laurate, magnesium stearate, magnesium droxystearate, aluminum tricaprylate, and aluminum distearate. Salts insoluble in water are particularly preferred, and salts of metals of group I are particularly preferred.

Specifically, magnesium stearate is most preferred. Component (d) fine particles in the ld oil solution width, preferably 0.0
It is necessary to contain the dispersed particles with a diameter of 5 to 5μ, particularly preferably 0.2 to 1.5μ, and one formulation is 0.
．． The content is 1-3% by weight, preferably 0.2-2% by weight. If component (d) is too small, the effect of improving unwinding property and smoothness will be insufficient, and if it is too large, it will become a non-Newtonian fluid, resulting in clogging of oil supply pipelines and fouling of machines. Dispersion of component (d) can be easily carried out by dissolving component (d) in an oil agent at a temperature above its melting point and slowly cooling it while stirring to precipitate particles. Alternatively, these components may be mixed and then dispersed using a machine such as a dyno mill, a sand mill, or an attritor.

To explain the effects of each of the above components, component (a) is particularly effective for smoothness at high speeds, that is, the yarn's horizontal freezing degree - Af 1 n t71 / 41r / I-M
Exhibits excellent smoothness (low frictional resistance) at 1 m W 444 L.

Component (a) is not compatible with the oligomer in the system.

In addition, it has low compatibility with various additives blended into polyurethane, so even if used at high levels, it will not have an adverse effect on scum generation in the post-processing process, and it also has good high-speed smoothness, so It is possible to reduce the adhesion rate of the oil agent to the surface and obtain a more preferable oil agent.

On the other hand, the metal soap of component (d) is a compound that has an anti-stick effect between threads, and also exhibits an excellent effect on friction, especially low-speed friction (100 m/min or less) where the thread travels at a low speed. The modified silicone of component (C) has the same effects as component (d), but in addition to these effects, it also has the following unique effects. That is, the component (C,)
On the other hand, when an oil containing no oil is heated to 60 to 100°C, component (d), which has been dispersed uniformly, coagulates and separates and settles.

The oil agent of the present invention containing component (C) can prevent this separation and sedimentation, and component CC) contains component (d, l). As a result, the performance is stable over a long period of time, and an excellent effect with high reproducibility can be obtained. Although this effect is observed in most modified silicones, the effect is particularly large on alkyl (other than methyl groups) [Group]・Aralkyl・Modified silicones such as polyether-modified silicone, polyether-modified silicone, and alkyl ether-modified silicone.

Post-processing of elastic fibers, especially polyurethane elastic fibers,
For example, the running speed of yarn in processes such as knitting, warping, rewinding, and covering is extremely diverse, usually ranging from a low speed of about 1 m/min to a high speed of 600 m/min or more. However, the smoothness of the yarn is speed dependent.
Yarns that are good at low speeds are not necessarily good at high speeds. Therefore, it is desired that the oil applied to the elastic yarn has the ability to improve smoothness over a wide range of speeds from low speeds to high speeds.

In the present invention, component (a) is high speed, - force component (c) and component (d) have the ability to prevent stickiness between yarns, improve smoothness at low speed, and are stable to heat. The component ratio of
By appropriately changing the content in the oil agent, we have succeeded in reducing frictional resistance over a wide range of running speeds.

The oil solution of the present invention has the above-mentioned four components as essential components, and can optionally contain a diluent such as mineral oil, an anti-coloring agent, an antistatic agent, an antifungal agent, a light stabilizer, and other additives.

Elastic threads to which the oil agent of the present invention can be applied include elastic threads such as polyurethane elastic threads, polyester elastic threads, polyamide elastic threads, and polycarbonate elastic threads, but it is particularly effective when applied to polyurethane elastic threads. Polyurethane elastic threads include polyether-based, polyester-based, polycarbonate-based, polyamide-based, and the like.

The present invention will be explained below with reference to Examples. In addition.

Parts and parts in the examples are by weight unless otherwise specified. Moreover, the unwinding property in the examples is the minimum elongation rate required to stably wind up the thread wound around the cheese. In addition, smoothness was evaluated by the friction coefficient of the thread against the friction surface of a fine needle. The measurement was carried out using an F meter R-1182 manufactured by Tsurupeyser Wooster Co., Ltd., and the measurement principle is as follows. That is, the thread is threaded around a knitting needle at a friction angle α, the thread is run in one direction, the thread tension is measured before and after passing through the knitting needle, and the coefficient of friction is calculated from this value using the following formula.

Note that the speed can be changed from 0WI1 minute to 600 m/min.

t2: Yarn tension on the input side (2) tl: Yarn tension on the output side Cf) αFriction angle expressed in niradian In: Natural logarithm f: Friction coefficient The scum test was performed by inserting the yarn into a dagger covering machine manufactured by Katama Kikai Kogyo Co., Ltd. A method was adopted in which the scum adhering to the top roller was visually judged for 24 hours and ranked into grades 1 to 5.

Example 1 15 parts of diphenylmethane 4.4' diisocyanate and 82.5 parts of polytetramethylene ether glycol having a molecular weight of 1500 were reacted at 80°C for 40 minutes to obtain a prepolymer. This was dissolved in 150 parts of dimethylformamide and cooled to 5°C.

1,2 propylene 11 dissolved in dimethylformamide
1 Reacted with 2 parts of diamine. The obtained polymeric viscosity
body solution (viscosity 2000 voids at 20°C) with pore size 0
．． The yarn was spun into an air stream heated to 210°C through a spinneret with 20 holes and a solvent content of 1.
After converging by mechanical false twisting when the temperature becomes less than 1, apply an oil agent and wind it up in +300 m; y minutes, and the weight is 5002.
of cheese.

Table 1 shows the results of examining the quality of polyurethane elastic yarns and cheeses obtained with various oil compositions.

As is clear from the table, when the oil of the present invention was used, it was stable to heat and showed excellent unwinding properties and smoothness even at a low oil deposition rate, and there was no scum generation or oil leaching. None of the comparative examples showed good results in all respects.

Comparative Example 15, which contained a small amount of metal soap, was insufficient in improving the unwinding property and smoothness. On the other hand, if the amount of metal soap blended is too large, problems such as clogging of oil supply pipelines and dirtying of machinery occur.

Patent applicant: Toyobo Co., Ltd.

Claims (1)

[Scope of Claims] 1. A diorganopolysiloxane (a) having a viscosity of 5 to 30 centistokes at 25°C, a higher alcohol or its ether, or a carboxylic acid ester having a carbon number of 12 or more (b), f-characteristic An oil agent containing silicone (C) and a salt (d) of a fatty acid having a cumulative number of atoms of 8 or more and a metal selected from Groups 1a, 2 and M4 of the Periodic Table as essential components, the component (d) ) is contained in the oil agent in a finely dispersed form in an amount of 0.1 to 3% by weight. 2. The oil agent for elastic threads according to claim 1, wherein the component (d) has a dispersed particle size of 0.05 to 5 μm.