JPH07278992A - Thread - Google Patents

Abstract

PURPOSE:To obtain a thread of sheath-core structure, having a light weight, substantially not flatten, excellent in dry-wet elongation resistance, oil resistance, antistatic properties, abrasion resistance, dimensional stability, etc., and capable of being suitably used for high speed Jacquard machines. CONSTITUTION:The thread for the high speed Jacquard machine is obtained by subjecting aramide or wholly aromatic polyester multifilaments having a tensile strength of >=18g/de and a tensile elongation of <=9% as core filaments and polyamide or polyester multifilaments having a tensile strength of <=12g/de and a tensile strength of >=9% as sheath filaments to a 12 beating treatment, immersing the formed unline-braided sheath-core structure thread in a treating solution containing a polyurethane, polyethylene oxide, a fluororesin, an ethyleneurea compound and an organopolysiloxane as main components, squeezing the thread for removing the solution, and subsequently thermally treating the squeezed thread for forming the coating film of the treating agent on the surface of the thread.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn used for a high speed loom, which has recently been rapidly increasing in speed, for example, a jacquard loom.

[0002]

2. Description of the Related Art In recent years, generally, looms have been rapidly increased in speed, but the threading for the looms associated therewith has not been able to cope with the rapid increase in speed. Therefore, there is a demand for threading that can follow a high-speed loom, particularly a high-speed jacquard loom, and various proposals have been made to cope with such a situation. For example, "a yarn for a jacquard loom formed by braiding a mixed yarn composed of an aramid multifilament yarn, a conductive fiber, and a heat-adhesive fiber as a core yarn and a nylon multifilament yarn as a braid in a mesh fabric structure" (JP-A-62-62). -90348 gazette) or "Threading formed by coating a composite thread composed of a thin and soft metal wire and an aramid-based fiber as a core thread with a coating agent in which a conductive powder is mixed with a resin" (Saikaihei 3-45982). ), "Threading characterized by braiding heat-resistant fibers to which a treating agent composed of polyurethane, polyethylene oxide, fluororesin, and ethylene urea compound is attached" (Japanese Patent Application No. 5-29068). Has been done. In addition, use of ceramic fibers, carbon fibers, glass fibers, amorphous fibers, etc. for threading is also disclosed (Actual Kaihei 3
-30278, etc.). However, various properties required for high-speed loom threading, namely elongation resistance, especially when wet,
The reality is that threading that fully satisfies oil resistance, electrostatic resistance, abrasion resistance, light weight, shape retention (a property that is difficult to flatten), etc. has not yet been realized. The inventors of the present invention have studied the various problems, found a solution to the problems, and arrived at the present invention.

[0003]

OBJECTS OF THE INVENTION The object of the present invention is to provide various properties required for threading for a high-speed loom, that is, elongation resistance, particularly elongation resistance when wet, oil resistance, antistatic property, abrasion resistance, lightness, and form. The purpose of the present invention is to provide a yarn that sufficiently satisfies the holding property (property that does not easily flatten) and the dimensional stability.

[0004]

That is, the present invention relates to "(Claim 1) A high-strength organic fiber having a tensile strength of 18 g / denier or more and a tensile elongation of 9% or less is used as a core yarn, and the tensile strength is 12 g / denier or less, Threading having a core-sheath structure formed by braiding a low-strength organic fiber having an elongation of 9% or more as a sheath yarn. (Claim 2) Polyurethane (A), polyethylene oxide (B), fluororesin (C), The threading according to claim 1, wherein a treating agent containing ethyleneurea compound (D) and organopolysiloxane (E) as main components is applied to the fiber surface of the sheath yarn. (Claim 3) The core yarn is an aramid fiber. Threading according to claim 1 or 2. (claim 4) Threading according to claim 1 or 2 in which the core thread is an aromatic polyester fiber (claim 5) Clause 1 in which the sheath thread is a polyester fiber
The threading according to any one of to 4. (Claim 6) The sheath yarn is a polyamide fiber.
The threading according to any one of 4 above. It is.

Here, the organic fiber having high strength and low elongation means
Aramid fiber (for example, Kevlar fiber manufactured by DuPont, Technora fiber manufactured by Teijin Limited, etc., but it is more preferred from the viewpoint of wear resistance and fatigue resistance), aromatic polyester fiber (for example, , Vectran fiber manufactured by Kuraray Co., Ltd., and ultra-high molecular weight polyethylene fiber (for example, TECMILON manufactured by Mitsui Petrochemical Industry Co., Ltd.), but from the viewpoint of friction heat resistance and dimensional stability, aramid fiber or aromatic polyester fiber. Is preferred. Further, the organic fiber used for the sheath yarn is a general-purpose organic long-fiber yarn that is generally used in various fields such as clothing and industrial materials, but among them, polyester fiber,
Polyamide fiber is preferable because it is easy to use in terms of versatility, cost, abrasion resistance and the like. The single yarn fineness of these fibers is 0.3.
.About.20.0 denier is preferable, and more preferably 0.
It is 5 to 15.0 denier. If it is less than 0.3 denier, single yarn breakage is likely to occur due to friction and abrasion with other objects during the production of the core-sheath structure, and the uniformity of single yarn in the strand (fiber assembly) is lowered, When used under a high load, stress concentration is likely to occur at a specific place, and the high strength inherent in the fiber assembly cannot be exhibited. On the other hand, if it exceeds 20.0 denier, the flexibility of the core-sheath structure is lowered and the bending fatigue resistance is deteriorated, and the durability of the yarn used in a bent state is lowered, which is not preferable.

As described above, the threading of the present invention uses the organic high-performance long fiber having high strength and low elongation as the core thread and is of a general-purpose type having relatively low strength and high elongation as compared with the core thread. It has a core-sheath structure formed by braiding long fibers as a sheath yarn, and the sheath yarn may be a single braid or a double braid.

Furthermore, the core-sheath structure of the present invention has a polyurethane (A), polyethylene oxide (B), fluororesin (C), ethylene urea compound ( A treatment agent comprising D) and an organopolysiloxane (E) is attached.

Polyurethane is a polymer obtained by reacting a polyether polyol with a polyisocyanate or a polycarbonate polyol with a polyisocyanate. From the viewpoint of water resistance and heat resistance, a polycarbonate polyol and a polyisocyanate are used. A high molecular polymer obtained by reaction with an isocyanate is more preferable. As the polyisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, diphenyl methane diisocyanate, triphenyl methane triisocyanate, aliphatic or aromatic polyisocyanates such as naphthylene diisocyanate can be used, Aliphatic polyisocyanates are more preferable from the viewpoint of weather resistance.

The oxidized polyethylene is obtained by oxidizing polyethylene to have a low molecular weight, and preferably has a hydroxyl group and / or a carboxyl terminal group. More preferably, it is an oxide of high-density polyethylene having a molecular weight of 1,000 to 7,000.

The fluororesin is a tetrafluoroethylene polymer,
Ethylene trifluoride chloride polymer, ethylene tetrafluoride / hexafluoropropylene copolymer, ethylene tetrafluoride / perfluoroalkyl vinyl ether copolymer, ethylene tetrafluoride / propylene hexafluoride / perfluoroalkyl vinyl ether polymer , Vinylidene fluoride copolymer, ethylene / 4
Examples include fluorinated ethylene copolymers. As the fluorine-based resin, a dispersion obtained by dispersing the fluorine-based resin in the form of fine particles in a dispersion medium using a dispersant, or an emulsion obtained by emulsifying the fluorine-based resin in the form of fine particles in an aqueous medium using an emulsifier is used.

The ethylene urea compound is a compound represented by the following general formula (Formula 1).

[0012]

[Chemical 1]

Typical compounds are aliphatic or aromatic polyisocyanates such as octadecyl isocyanate, hexamethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthylene diisocyanate and triphenylmethane triisocyanate. And the reaction product of ethyleneimine is usually used in the form of an aqueous dispersion.

The organopolysiloxane is usually at 25 ° C.
In addition to dimethylpolysiloxane, diphenylpolysiloxane, methylphenylpolysiloxane called silicone oil having a viscosity of 5 to 200,000 centipoise, various modified polysiloxanes represented by the following general formula (Formula 2) are also available. can give.

[0015]

[Chemical 2]

Of these organopolysiloxanes, those having water dispersibility by modification can be used as they are when other compounding agents are water-based compositions.
When ordinary silicone oil is used, it is desirable to add an emulsified emulsion.

The treatment method of the treatment agent used in the present invention may be a conventionally known method such as a spray method or a coating method. A yarn fiber or core-sheath structure in a liquid obtained by mixing an aqueous dispersion of polyurethane (A), polyethylene oxide (B), fluororesin (C), ethylene urea compound (D), and organopolysiloxane (E). Dip and impregnate objects, then dry,
The method of heat treatment is the simplest. That is, the core-sheath structure may be impregnated before being formed, or may be braided into a core-sheath structure and then impregnated. Further, a small amount of conductive powder may be mixed in the treatment agent liquid in order to reduce the charging phenomenon during use. The solid concentration of the treating agent is 1 to 25% by weight.
Is preferred. More preferably, it is 5 to 20% by weight. The drying temperature is preferably 100 to 150 ° C., and the drying time is preferably 0.5 to 15 minutes. If the drying temperature is less than 100 ° C, the formation of the coating film with the treating agent is insufficient, and if it exceeds 150 ° C, the moisture in the treating agent evaporates rapidly, and a good coating film cannot be obtained. The heat treatment temperature is preferably 160 to 240 ° C., and the heat treatment time is preferably 0.2 to 10 minutes. Heat treatment temperature is 160 ℃
If it is less than the above range, the cross-linking of the formed film is insufficient and good film strength cannot be obtained. If the heat treatment temperature exceeds 240 ° C., the coating film deteriorates and the strength decreases. The amount of the treatment agent coating attached to the thread after treatment is preferably 0.3 to 15% by weight. Particularly, 1 to 8% by weight is preferable. If it is less than 0.3% by weight, improvement in wear resistance and bending durability is insufficient. If it exceeds 15% by weight, the yarn after treatment is remarkably coarse and the bending durability is lowered.

If desired, soft metal fibers, carbon fibers or the like may be mixed with the core yarn or the sheath yarn of the core-sheath structure in order to reduce the charging property during use.

[0019]

EFFECTS OF THE INVENTION The yarn of the present invention sufficiently satisfies elongation resistance, particularly elongation resistance when wet, oil resistance, antistatic property, abrasion resistance, light weight, shape retention, dimensional stability and the like. It is threading.

Hereinafter, the method for producing the yarn of the present invention will be specifically described with reference to Examples. The tensile strength, elongation, wear resistance, and shape retention were evaluated according to the following methods. <Measurement method of tensile strength and elongation> According to 7.5 of JIS-L-1013. <Abrasion Resistance Evaluation Method> An evaluation apparatus is shown in FIG. In FIG. 1, 1 is a thread guide plate for thread splitting used in a high-speed jacquard machine, 2 is a thread guide hole formed in 1, 3 is a thread sample for evaluation, and 4 is a thread sample for evaluation. Rollers 5 that rotate freely are loads. The evaluation of wear resistance was performed as follows. That is, a load 5 corresponding to 0.2 g / denier is attached to one end of a threading sample 3 having a core-sheath structure, and the other end of the sample is freely rotated, and a thread guide plate for threading is divided. After passing through the thread guide hole 2 opened in the first step, reciprocating motion is performed again through the freely rotating roll 4, and the number of reciprocations until the sample 3 is cut by frictional wear with the thread guide hole 2 The abrasion resistance was comparatively evaluated. The evaluation sample 3 has abrasion resistance by passing through the yarn guide hole 2 and then reciprocating the other end of the evaluation sample 3 in a state of being set to bend 90 degrees as shown in FIG. Was evaluated comparatively. <Evaluation of Shape Retention> An average of the sample for evaluation was applied vertically to one end of the sample for evaluation 9000 m under load (g) corresponding to 1/10 of the yarn weight (total fineness) of the sample for evaluation. Diameter A is measured and the sample is
The maximum width (major axis) B of the sample at the portion that comes into contact with the iron bar is measured with the same load applied to the iron bar of mm so as to be bent by 180 degrees, and A and B are inserted into the following formula. The morphological retention rate was calculated and used as an evaluation scale of morphological retention. Morphological change rate = B / A x 100 (%) <Dimensional stability> At room temperature, one end of the evaluation sample is fixed, and the other end corresponds to 1/10 of the yarn weight (total fineness) of the evaluation sample 9000 m. The load (g) was applied and the sample was allowed to stand for 15 days, then the elongation (creep property;%) was measured and compared as a measure of dimensional stability.

[0021]

Example 1 One aramid filament fiber consisting of 1500 denier 1000 filaments (Technora manufactured by Teijin Ltd.) was used as the core thread, and polyester filament fiber consisting of 96 filaments of 500 denier was manufactured as the sheath thread [manufactured by Teijin Ltd., Tetoron] and single braided with 12 strokes to obtain a jacquard threading sample having a core-sheath structure. The evaluation results of the obtained thread were as shown in Tables 1 and 2.

[0022]

EXAMPLE 2 One aramid filament fiber consisting of 1500 denier 1000 filaments (Technora manufactured by Teijin Ltd.) was used as the core yarn, and polyamide filament fiber yarn consisting of 420 denier 68 filaments was prepared as the sheath yarn [manufactured by Teijin Ltd.,
Nylon-6] was used for single braiding with 12 strokes to obtain a jacquard threading sample having a core-sheath structure. The evaluation results of the obtained thread were as shown in Tables 1 and 2.

[0023]

[Example 3] A jacquard having a core-sheath structure was carried out in the same manner as in Example 1 except that one aromatic polyester long-fiber yarn (Vectran, manufactured by Kuraray Co., Ltd.) consisting of 1500 denier 300 filaments was used as the core yarn. A threading sample was obtained.
The evaluation results of the obtained thread were as shown in Tables 1 and 2.

[0024]

Example 4 As a treatment liquid, an aqueous dispersion of polyurethane (A) (35% by weight of active ingredient) and an aqueous dispersion of polyethylene oxide (B) having a molecular weight of 4,500 (25% by weight of active ingredient) and 4 parts of fluorine were added. Dispersion of ethylene oxide polymer (C) (active ingredient 60% by weight), aqueous dispersion of diphenylmethanediethyleneurea (D) (active ingredient 25% by weight) and aqueous dispersion containing dimethyl silicone (E) as a main component (Active ingredient 4
0% by weight) shown in Table 1 as an active ingredient ratio (solid content ratio;
Each of the aqueous dispersions was mixed to prepare a compounding solution so that the formulation liquid was The solid concentration of this compounding treatment liquid was 10% by weight. A jacquard yarn having a core-sheath structure produced by the same method as in Example 1 was dipped in the compounding treatment solution to sufficiently impregnate it, then lightly squeezed with a nip roll, and subsequently at 120 ° C. for 1.5 minutes. Heat-treat and dry for 18 minutes
A heat treatment was performed at 0 ° C. for 1 minute to crosslink the treatment agent coating formed on the fiber surface. The evaluation results of the obtained thread were as shown in Table 2.

[0025]

Examples 5 to 8 The same procedure as in Example 4 was carried out except that the solid content ratio of the treating agent was adjusted to the ratio shown in Table 1. A treated thread sample was obtained, and the thread was measured and evaluated in the same manner as in Example 4. The results are shown in Table 2.

[0026]

Example 9 Example 2 was repeated except that a jacquard threading sample having a core-sheath structure of a double braid structure in which the inner layer portion was braided by 8 strokes and the outer layer portion was braided by 12 strokes was prepared in Example 2. The same procedure as in Example 2 was carried out to measure and evaluate the obtained jacquard treated threading sample having the core-sheath structure. The results are shown in Tables 1 and 2.

[0027]

Comparative Example 1 A core was prepared in the same manner as in Example 1 except that three polyester filament fiber yarns (Tetron manufactured by Teijin Limited) consisting of 500 denier 96 filaments were used as the core yarn. A treated threading sample for a jacquard having a sheath structure was obtained. This threading was measured and evaluated in the same manner as in Example 1. The results are shown in Tables 3 and 4.

[0028]

Comparative Example 2 A core was prepared in the same manner as in Example 2 except that three polyester filament fiber yarns (Tetron manufactured by Teijin Limited) consisting of 500 denier 96 filaments were used as the core yarn. A treated threading sample for a jacquard having a sheath structure was obtained. This thread was measured and evaluated in the same manner as in Example 2. The results are shown in Tables 3 and 4.

[0029]

[Comparative Examples 3 to 7] The same jacquard threading sample having the same core-sheath structure as that used in Example 4 was dipped in the untreated single treatment agents shown in Comparative Examples 3 to 7 in Table 3. The treated yarn sample for jacquard obtained in the same manner as in Example 4 except for the impregnation treatment was measured and evaluated in the same manner as in Example 4. The results are shown in Table 4.

[0030]

[Table 1]

[0031]

[Table 2]

[0032]

[Table 3]

[0033]

[Table 4]

[Brief description of drawings]

FIG. 1 is a side sectional view of a wear resistance evaluation device.

[Explanation of symbols]

1. Thread guide plate for thread splitting used in high-speed jacquard machines. 2.1 Threading hole for threading guide. 3. Threading sample for evaluation. 4. A roller that rotates freely. 5. load.

Claims (6)

[Claims] 1. A high-strength organic fiber having a tensile strength of 18 g / denier or more and a tensile elongation of 9% or less as a core yarn, and a low-strength organic fiber having a tensile strength of 12 g / denier or less and a tensile elongation of 9% or more. A core-sheath structure thread formed by braiding a series fiber as a sheath thread. 2. A treatment agent containing polyurethane (A), polyethylene oxide (B), fluororesin (C), ethylene urea compound (D) and organopolysiloxane (E) as main components is applied to the fiber surface of the sheath yarn. The yarn according to claim 1, which is provided. 3. The thread according to claim 1, wherein the core yarn is an aramid fiber. 4. The yarn according to claim 1, wherein the core yarn is an aromatic polyester fiber. 5. The sheath yarn is a polyester fiber.
The threading according to any one of to 4. 6. The sheath yarn is a polyamide fiber.
The threading according to any one of 4 above.