JPH11256485A - Braid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a braid suitable for binding coil ends of compressors in refrigerators and air conditioners using an alternative flon by using a specific polyphenylene fiber and braiding with braid pitch numbers of a specific range. SOLUTION: This braid is constituted of a polyphenylene sulfide fiber having >=30,000, preferably >=50,000 weight average molecular weight, 2-20 de, preferably 5-20 de, more preferably 10-20 de monofilament size and >=300 de whole size in a range of 3-15 braid pitch number/10 cm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an abrasion-resistant material,
The present invention relates to a braid which is less likely to generate fluff when used as a binding material for binding a copper wire (coil end) of a refrigerator or an air conditioner compressor using an alternative Freon.

[0002]

2. Description of the Related Art Conventionally, a binding material has been used to bind a coil of a motor of a compressor such as a refrigerator, a freezer, and an air conditioner. The binding material is used by being immersed in the coolant or in contact with the coolant. Until now,
As the refrigerant, Freon 11, 12, 114, 115 or the like was used, and as the binding material, a polyester fiber made of polyethylene terephthalate was used without any problems in a twisted state or in a braided state.

[0003] However, since the above-mentioned chlorofluorocarbon may destroy the ozone layer of the earth, its use will be regulated in the future by laws and voluntary regulations of the industry. As a substitute for these Freon, Freon 134a
(Ozone depletion coefficient 0) and Freon 22 (Ozone depletion coefficient 0.05) are being studied.

However, if a conventional binding material is used for a compressor coil using these alternative CFCs as a refrigerant, monomers or oligomers present in the polyester fibers are extracted by the refrigerant due to an increase in the operating temperature. As a result, a current leaks into the refrigerant, causing an abnormal current to blow the fuse. Under such circumstances, many electric manufacturers strongly demand the development of a binding material that exhibits the same performance as the conventional one even when the refrigerant is changed to an alternative fluorocarbon.

In response to these demands, Japanese Patent Application Laid-Open No. 6-024461 uses a synthetic fiber having a xylene extraction amount of 0.3% by weight or less after removing an oil agent attached to the synthetic fiber as a binding material. It has been proposed. However, although the technique described in the above publication solves the problem caused by the monomers and oligomers extracted by the refrigerant, it has been found that there is a problem that the fibers are fluffed when the coils are bound. If the binding material has fluff, the fluff is cut and foreign matter is clogged in the capillary that vaporizes the refrigerant. When the foreign matter is clogged, there is a problem that the refrigerant is not sufficiently circulated, and thus the cooling is not sufficiently performed.

[0006]

SUMMARY OF THE INVENTION The present invention has excellent abrasion resistance and generates fluff even when used as a binding material for binding a copper wire (coil end) of a compressor of a refrigerator or an air conditioner using an alternative CFC. To provide less braid.

[0007]

The present invention employs the following means to solve the above-mentioned problems. That is,
An object of the present invention is to provide a braid made of polyphenylene sulfide fiber, wherein the number of braided pitches is 3 times / 10 cm or more and 15 times / 10 cm or less.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. According to the configuration of the present invention, a copper wire (coil) for a compressor of a refrigerator or an air conditioner using an alternative chlorofluorocarbon is used, which is made of polyphenylene sulfide fiber and has a combined pitch number of 3/10 cm to 15/10 cm. Even if it is used as a binding material for binding the end), a braid that does not generate fluff can be realized. The number of braided pitches of the braid must be 3 times / 10 cm or more and 15 times / 10 cm or less from the viewpoint of abrasion resistance, which is considered to be a cause of fluff. If the number of assembled pitches is more than 15 times / 10 cm,
Since the single yarn does not shift, the portion of the single yarn that rubs with the coil of the compressor is concentrated, and fluff is likely to occur. If the number of braided pitches is less than 3/10 cm, the fibers are caught by the coil during bundling and cut because the displacement of the single yarn is large.

The polyphenylene sulfide fiber used in the present invention is a fiber known to have excellent heat resistance, chemical resistance, and hydrolysis resistance, and the fiber has 90% or more of its constituent units. It is a fiber made of a polymer containing a phenylene sulfide structural unit composed of (C ₆ H ₄ —S) —. If this fiber is used, the electrical insulation will not be reduced even if it is used as a binding material for a motor that uses alternative Freon as a refrigerant.

The above-mentioned fibers preferably have a weight average molecular weight of 30,000 or more, more preferably 50,000 or more, in order to obtain a braid excellent in abrasion resistance. It is more preferably 50,000 to 1,000,000, more preferably 50,000 to 500,000, further preferably 50,000 to 100,000, and further preferably 50,000 to 70,000. When the weight average molecular weight is less than 30,000, the strength of the single yarn is reduced, and the single yarn is liable to be broken during bundling. As a result, fluff is generated on the braid. As the weight average molecular weight increases, melt fracture tends to occur, and spinning stability decreases.

The single fiber fineness of the above-mentioned fibers is preferably 2 denier to 20 denier, more preferably 5 to 20 denier, more preferably 10 to 20 denier. It is preferable to obtain an excellent braid. When the single yarn fineness is smaller than 2 deniers, the single yarn strength becomes low, so that single yarn breakage is likely to occur at the time of bundling, and fluff is generated on the braid. Single yarn fineness is 20
If it exceeds denier, the fineness of the single yarn is too large, so that the fineness tends to be uneven at the time of spinning, and the spinning stability is affected.

Further, the polyphenylene sulfide fiber may be a spun yarn using a long fiber or a short fiber. The obtained fiber is formed into a braided body by a known method. The number of sets may be any number such as 4, 8, 16, 24, 32, etc. The obtained braid can be used as it is. Further, the braid may be mixed with polyester fibers to such an extent that the operability of the compressor is not impaired.

The total fineness of the above braid is preferably 300
Denier or more is good for obtaining a braid excellent in wear resistance. When the total fineness of the braid is thin, the strength of the braid is low, and the yarn is liable to be broken at the time of bundling, resulting in cutting.

[0014]

The present invention will be described more specifically with reference to the following examples. The weight average molecular weight and wear strength in the examples were measured by the following methods.

Weight average molecular weight: Measured by gel permeation chromatography (GPC) using 1-chloronaphthalene as a solvent and polystyrene as a reference polymer.

Abrasion strength: JIS L-1096 6.1
7 The measurement was performed according to the bending method described in A-2, and the number of times until the test piece was cut was measured.

Example 1 Dichlorobenzene and sodium sulfide were reacted to obtain a polyphenylene sulfide polymer having a weight average molecular weight of 50,000. Two polyphenylene sulfide fibers (fineness: 250 denier, 30 filaments, single yarn fineness: 8.3 denier) obtained from this polymer are aligned, and are laced using a cording machine.
The braid was assembled by hitting to obtain a braid having a braid pitch of 14 times / 10 cm.

The obtained braid has excellent abrasion resistance of abrasion strength of 2480 times, and shows no generation of fluff.
No problem of fluffing was found.

A refrigerator incorporating a motor using the braid obtained in this manner as a tying member was mounted, and a refrigerator using Freon 22 as a refrigerant was operated for three months. No clogging was observed and no problems occurred.

Example 2 A polyphenylene sulfide fiber obtained from the same polymer as used in Example 1 (denier: 432 denier, 2
Two filaments (4 filaments, single yarn fineness: 18 denier) were aligned and assembled using a braiding machine with 24 strokes to obtain a braid having a braid pitch of 4 times / 10 cm.

The obtained braid has excellent abrasion resistance with a wear strength of 3140 times, and shows no generation of fluff.
No problem of fluffing was found.

A refrigerator incorporating a motor using the braid obtained in this manner as a binding material was mounted, and a refrigerator using Freon 134a as a refrigerant was operated for three months. No clogging was observed and no problems occurred.

Comparative Example 1 Two fibers identical to those used in Example 1 were aligned and assembled using a lacing machine in eight strokes, and the assembly pitch was 24 times / 10c.
m was obtained.

The obtained braid had poor abrasion resistance with an abrasion strength of 470 times, and had a number of fluffs of 7/10 cm and many fluffs were observed.

A refrigerator incorporating a motor using the braid obtained in this manner as a tying material was mounted, and a refrigerator using Freon 22 as a refrigerant was operated for three months. Was found, and it was insufficient as a binding material.

Comparative Example 2 Four fibers identical to those used in Example 1 were aligned and assembled with a cording machine by 16 strokes.
m was obtained.

The braid obtained was excellent in abrasion resistance with a wear strength of 3170 times, but the braid was cut when the coils were bound, and the coils could not be bound.

Comparative Example 3 Dichlorobenzene and sodium sulfide were reacted to obtain a polyphenylene sulfide polymer having a weight average molecular weight of 20,000. Two polyphenylene sulfide fibers (250 denier, 30 filaments, single yarn fineness of 8.3 denier) obtained from this polymer are aligned, and a 2
Braiding was performed with four strokes to obtain a braid having a braid pitch of 18 times / 10 cm.

The resulting braid had poor wear resistance with a wear strength of 590 times, and also had a large number of fluffs of 6/10 cm.

A refrigerator incorporating a motor using the braid thus obtained as a tying member was mounted, and a refrigerator using Freon 22 as a refrigerant was operated for three months. However, foreign matter was clogged in a capillary for vaporizing the refrigerant. Was found, and it was insufficient as a binding material.

Comparative Example 4 Two polyphenylene sulfide fibers (fineness: 50 denier, 36 filaments, single yarn fineness: 1.4 denier) obtained from the same polymer as used in Example 1 were aligned and a lacing machine was prepared. Assemble with 32 strokes and assemble pitch 30
A braid measuring 10 times per cent was obtained.

The resulting braid was inferior in abrasion resistance as abrasion strength was 280 times, and had a number of fluffs of 14/10 cm and many fluffs were observed.

A refrigerator incorporating a motor using the thus obtained braid as a tying member was mounted, and a refrigerator using Freon 22 as a refrigerant was operated for three months. However, foreign matter was clogged in a capillary for vaporizing the refrigerant. Was found, and it was insufficient as a binding material.

Comparative Example 5 Two polyphenylene sulfide fibers (30 denier, 15 filaments, single yarn fineness of 2 denier) obtained from the same polymer as used in Example 1 were aligned, and 4 Assemble by hitting, assembled pitch 20 times / 10
cm was obtained.

The resulting braid had inferior abrasion resistance as abrasion strength of 430 times, and had a number of fluffs of 14/10 cm and many fluffs.

A compressor incorporating a motor using the thus obtained braid as a tying material was mounted, and a refrigerator using Freon 22 as a refrigerant was operated for three months. However, foreign matter was clogged in a capillary for vaporizing the refrigerant. Was found, and it was insufficient as a binding material.

[0037]

The braid of the present invention uses polyphenylene sulfide fiber as a synthetic fiber, and the number of braided pitches is 3 times / 10 cm or more and 15 times / 10 cm or less. When used as a binding material for binding a copper wire (coil end) of a compressor of a refrigerator or an air conditioner, it is possible to provide a braid which generates less fluff and can maintain electrical insulation for a long period of time.

Claims (9)

[Claims] 1. A polyphenylene sulfide fiber having a pitch of 3 times / 10 cm or more and 15 times / 10 c.
m or less. 2. A polyphenylene sulfide fiber having a weight average molecular weight of 30,000 or more.
The described braid. 3. A polyphenylene sulfide fiber having a weight average molecular weight of 50,000 or more.
The described braid. 4. The braid according to any one of claims 1 to 3, wherein the single braid is made of a polyphenylene sulfide fiber having a denier of 2 to 20 deniers. 5. The braid according to any one of claims 1 to 3, wherein the braid is made of a polyphenylene sulfide fiber having a denier of 5 to 20 deniers. 6. The braid according to any one of claims 1 to 3, wherein the single braid comprises a polyphenylene sulfide fiber having a denier of 10 to 20 deniers. 7. The braid according to claim 1, wherein the braid is made of polyphenylene sulfide fiber having a total fineness of 300 denier or more. 8. A braid according to claim 1, wherein said braid is a binding material for binding a motor coil using alternative Freon. 9. A binding material comprising a braid according to any one of claims 1 to 7.