JPH0615745B2 - Oil agent for elastic yarn - Google Patents

Description

The present invention relates to an oil agent for elastic yarns, and more specifically, the elastic yarns have a small adhesiveness between polyurethane elastic yarns and have excellent unwinding property, and moreover, the friction resistance of the elastic yarns is It is always small regardless of the running speed, and it is a scum such as a guide while running (solids or high-viscosity components in the oligomer or oil in the yarn extracted by the oil component are separated in solid or paste form. ) It relates to an oil agent for obtaining elastic fibers which are less produced.

Since the elastic yarn has a lower Young's modulus than other fibers for clothing and is very liable to stretch, the frictional resistance with a guide or the like in a post-processing step such as warping or knitting must be particularly small. Also, since the adhesiveness between the threads is large, unless the oil agent having the anti-adhesive property is applied, the threads stick to each other on the cheese and the unwinding property becomes poor, and there is a drawback that thread breakage occurs frequently in the post-processing step. 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. Therefore, the elastic fiber is spun with a considerably large amount of oil agent as compared with other synthetic fibers. It is usually applied in the process. Especially in recent years, polyurethane-based elastic fibers are also 400
Since it is used at a high speed of up to 800 m / min, it is desired to reduce the frictional resistance during high speed running. However, if the oil agent adhesion rate is high, a large amount of oil agent and scum will adhere to the guides and knitting needles of the knitting machine with which the yarn comes into contact, so there is a drawback that product contamination and clogging due to cotton wool adsorption etc. may occur, and cleaning is often necessary. Becomes In addition, there is also a drawback that the oil agent is exuded from the cheese or the beam to contaminate equipment, machines and the like.

Conventionally, a modified silicone such as a polyether modified silicone is used in a low viscosity diorganopolysiloxane such as 5 to 30 centistokes in order to reduce the tackiness and frictional resistance of the elastic yarn and the unwindability between the yarns. It is also known from JP-A-57-128276 that 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 connecting oil) is dispersed or dissolved. However, such an oil agent also requires a large amount of the binder oil for dissolving the polyether-modified silicone incompatible with the diorganopolysiloxane, and when the binder oil is large, a large amount of the oligomer component in the yarn is eluted. In addition to causing scum, the content of diorganopolysiloxane as a high-speed smoothing agent decreases so much that it is necessary to increase the amount of oil agent to obtain good smoothness, which causes scum generation. It has drawbacks such as

In view of such a current situation, the present inventors have arrived at the present invention as a result of earnest research to develop an oil agent for elastic yarns that exhibits excellent effects with a small oil agent application rate. That is,
The present invention relates to a diorganopolysiloxane (a) having a viscosity of 5 to 30 centistokes at 25 ° C., a higher alcohol or an ether thereof or a carboxylic acid ester (b) having 12 or more carbon atoms, a modified silicone (c) and a carbon atom. Fatty acids with a number of 8 or more and genus Ia, genus II and II of the periodic table
An oil agent containing, as an essential component, a salt (d) with a metal selected from Group I, wherein the total of the components (a) and (c) is 40 to 90% by weight based on the oil agent, and the components (a) and ( The mixing ratio of c) is 20 to
80%, the ratio of component (c) is 1 to 5% by weight of the oil agent
It is characterized in that (d) is contained in an oil agent in an amount of 0.1 to 3% by weight in the form of fine dispersion having a dispersed particle diameter of 0.05 to 5 μm.

Hereinafter, the oil agent of the present invention will be described in more detail.

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

(a) Viscosity (25 ° C) 5 to 30 centistokes diorganopolysiloxane (b) Higher alcohol or its ether or carboxylic acid ester having 12 or more carbon atoms (c) Modified silicone, preferably viscosity (25 ° C) Fifty
~ 5000 centistokes (d) fatty acid having 8 or more carbon atoms and Ia group, I
Salt with a metal selected from the group consisting of Group I and Group III As the diorganopolysiloxane (a), dimethylpolysiloxane is usually preferable, but a part of the methyl group is one of other alkyl groups, phenyl groups and the like. It may be substituted with a valent organic group. The viscosity is 5 to 30 from the viewpoint of smoothness and uniformity.
Centistokes (25 ° C.) is used. Further, the higher alcohol or its ether or the carboxylic acid ester (b) having 12 or more carbon atoms is a medium for improving the dispersion and solubility of the component (c) in the component (a), that is, a binder oil, for example, carbon. Higher alcohol or ether thereof having 12 or more atoms, preferably 12 to 20, carboxylic acid having 2 to 20 carbon atoms and 1 to 20 carbon atoms
The number of carbon atoms obtained from the saturated aliphatic alcohol is 1
Two or more esters and the like are exemplified. More specifically, lauryl alcohol, tridecyl alcohol, myristyl alcohol, pentadecyl alcohol, cetyl alcohol, heptadecyl alcohol, stearyl alcohol,
Higher alcohols such as eicosyl alcohol, ethers such as alkyl ethers of the alcohol, isopropyl myristate, isopropyl palmitate,
Fatty acid esters such as lauryl propionate and stearyl acetate, aromatic carboxylic acid esters such as octyl benzoate, dodecyl benzoate, dibutyl phthalate, dioctyl phthalate, didodeciphthalate, tributyl trimellitate, trioctyl trimellitate It is illustrated. However, particularly preferred are higher alcohols and fatty acid esters.

The modified silicone (c) is a component that mainly reduces the tackiness of the yarn and improves the unwinding property of the wound yarn. For example, the polyether modified having a polyether chain as a main chain, a side chain or an unterminated group. It has at least one kind of side chain such as silicone, amino group, carboxyl group, epoxy group, carbinol group, acyloxyalkyl group, halogenated alkyl group, aralkyl group, higher alcohol ester group, mercapto group and alkyl ether group. Examples thereof include modified organopolysiloxane, and those modified to such an extent that they are insoluble in diorganopolysiloxane (a) are used. The proportion of the modifying group in the modified silicone is usually preferably 10% by weight or more. A particularly preferred modified silicone is a polyether modified silicone. The above component (b) is used as a connecting oil in order to uniformly mix the diorganopolysiloxane (a) and the modified silicone (c) to form a stable oil agent, but those which do not elute the oligomers in the yarn are preferred alone or 2 It is appropriately used in combination of one or more species. Since the binder oil has no significant effect on the reduction of the frictional resistance of the yarn, and the effect of improving the unwinding property is small, it is preferable that the blending amount in the oil agent is as small as possible. It is preferable that the total amount of the component (c) is 40 to 90% by weight based on the oil agent. Further, the mixing ratio of the component (a) and the component (c) is 20 to 8
A 0: 1 weight ratio is preferred. If the component (c) is too small, the smoothness at low speed running becomes insufficient, while if the component (c) is too large, the compatibility of both components deteriorates even if the component (b) is added. The proportion of the component (c) in the oil agent is preferably 1 to 5% by weight.

Examples of 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 III of the periodic table in the oil agent of the present invention include capric acid Examples include sodium, sodium laurate, lithium stearate, zinc palmitate, magnesium laurate, magnesium stearate, magnesium hydroxystearate, aluminum tricaprylate, and aluminum distearate. Particularly, a salt insoluble in water is preferable, and a salt of a Group II metal is particularly preferable. Specifically, magnesium stearate is most preferable. Component (d) is in the form of fine particles in an oil agent, preferably 0.05 to 5
It is important to contain the particles in a dispersed particle size of μ, particularly preferably 0.2 to 1.5 μ, and the blending amount is 0.1 to 3 with respect to the oil agent.
% By weight, preferably 0.2 to 2% by weight. If the amount of component (d) is too small, the unwinding and smoothness improving effects will be insufficient, and if it is too large, it will lead to the drawback of clogging the oil supply pipeline with non-Newtonian fluid and fouling the machine. The dispersion of the component (d) can be easily carried out by dissolving the component (d) in the oil agent at a melting point or higher and gradually cooling with stirring to precipitate particles. It is also possible to carry out a method in which these respective components are mixed and then dispersed by a machine such as a dyno mill, a sand mill or an attritor.

Explaining the action of each of the above components, the component (a) is particularly effective for smoothness at high speed, that is, when the running speed of the yarn is 100 m / min or more, excellent smoothness (friction resistance is Small). Component (a) is incompatible with the oligomers in the yarn and has low compatibility with various additives incorporated in polyurethane, and therefore, even if used in a high concentration, it adversely affects scum generation in the post-processing step. In addition to the above, the high-speed smoothness is good, so that the oil agent adhesion rate to the yarn can be reduced and a more preferable oil agent can be obtained.

On the other hand, the metallic soap as the component (d) is a compound having an anti-adhesion action between yarns, and exhibits an excellent effect also on friction, particularly low-speed friction (100 m / min or less) where the yarn traveling speed is low. The modified silicone of the component (c) has the same effect as the component (d), but in addition to this action effect, it also has the following unique effect. That is, when the oil agent not containing the component (c) is heated to 60 to 100 ° C., the component (d) which is once uniformly dispersed is aggregated to cause separation and sedimentation, whereas the oil formulation containing the component (c) is mixed. Since the oil agent of the present invention can prevent this separation and sedimentation, the component (c) functions as a dispersion stabilizer of the component (d), and accordingly, the performance is stable for a long period of time and is excellent in reproducibility. The effect is obtained. Although such effects are observed in most modified silicones, the ones that are particularly effective are modified silicones such as alkyl (groups other than methyl groups), aralkyl, polyether modified silicones, polyether modified silicones, and alkyl ether modified silicones. Is.

Elastic fiber, especially polyurethane elastic fiber post-processing,
For example, the traveling speed of the yarn in the processes such as knitting, warping, rewinding, covering, etc. is usually various, 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 has speed dependence,
A good yarn at low speed is not always good at high speed. Therefore, it is desired that the oil agent attached to the elastic yarn has the ability to improve the smoothness in a wide range of speeds from low speed to high speed. In the present invention, the component (a) has a high speed, while the components (c) and (d) have the ability to prevent stickiness between threads and improve smoothness at a low speed, and are stable to heat as well. By appropriately changing the component ratio and the content ratio in the oil agent, the friction resistance in a wide range of traveling speeds was successfully reduced.

The oil agent of the present invention contains the above-mentioned four components as essential components, and may optionally contain a diluent such as mineral oil, an anti-coloring agent, an antistatic agent, an anti-inflammatory agent, a light-proofing agent and other additives.

Examples of the elastic thread to which the oil agent of the present invention can be applied include elastic threads such as polyurethane elastic thread, polyester elastic thread, polyamide elastic thread, and polycarbonate elastic thread, and particularly effective when applied to polyurethane elastic thread. Polyurethane elastic yarn includes polyether type, polyester type, polycarbonate type, polyamide type and the like.

Hereinafter, the present invention will be described with reference to examples. The parts and% in the examples are based on weight unless otherwise specified. In addition, the unwinding property in the examples is the minimum rate of elongation for stably winding the yarn wound on the cheese. The smoothness was evaluated by the coefficient of friction of the yarn with respect to the friction surface of the knitting needle. Measured by Tsurubayzer Worcester F meter R
The measurement principle is as follows.
That is, the yarn is hung on the knitting needle at the friction angle α to run in one direction, the yarn tension is measured before and after the passage of the knitting needle at this time, and the friction coefficient is determined from this value by the following equation. The speed is 0
It can be changed from m / min to 600 m / min.

In the scum test, a thread was applied to a double covering machine manufactured by Kataoka Kikai Kogyo Co., Ltd. for 24 hours, and the scum attached to the top roller was visually judged to rank it into 1 to 5 grades.

Example 1 A prepolymer was obtained by reacting 15 parts of diphenylmethane 4,4 ′ diisocyanate with 82.5 parts of polytetramethylene ether glycol having a molecular weight of 1500 at 80 ° C. for 40 minutes. This was dissolved in 150 parts of dimethylformamide, cooled to 5 ° C., and then reacted with 2 parts of 1,2-propylenediamine dissolved in dimethylformamide. The obtained polymerized viscous solution (viscosity 2000 poise at 20 ° C.) was passed through a spinneret with a pore size of 0.2 mm and 20 pores, and 2
The yarn was spun in a stream of air heated to 10 ° C, and when the solvent content rate was 1% or less, the yarn was converged by mechanical false twisting, then an oil agent was added, and the yarn was wound at 300 m / min and weighed. 500 g of cheese was obtained.

Table 1 shows the results of examining the quality of the polyurethane elastic yarn obtained by variously changing the oil composition and the cheese thereof.

As is clear from the table, when the oil agent of the present invention is used, it shows excellent unwinding property and smoothness even with a low oil agent adhesion rate which is stable to heat, and scum generation and oil agent leaching were not observed. None of the comparative examples showed good results in all respects.

Comparative Example 15 containing a small amount of metal soap had an insufficient effect of improving unwinding property and smoothness. On the other hand, if the amount of metal soap blended is too large, defects such as clogging of the pipeline for supplying the oil agent and soiling of the machine occur.

Claims (1)

[Claims] 1. A diol having a viscosity of 5 to 30 centistokes at 25 ° C. is a polypolysiloxane (a), a higher alcohol or an ether thereof or a carboxylic acid ester having 12 or more carbon atoms (b), and a modified silicone (c). And an oil agent containing a salt (d) of a fatty acid having 8 or more carbon atoms and a metal selected from Group Ia, Group II and Group III of the Periodic Table as essential components, comprising components (a) and (c) Is 40 to 90% by weight with respect to the oil agent. The mixing ratio of components (a) and (c) is 20 to 80: 1 to 5% by weight with respect to the oil agent. Component (d) is in the oil agent. An oil agent for elastic yarns, characterized in that 0.1 to 3% by weight is contained in a finely dispersed state with a dispersed particle diameter of 0.05 to 5 μm.