JPH0813300A - Motor binding string - Google Patents

Abstract

PURPOSE:To obtain a motor binding string causing no decline in the electrical insulation of the motor and developing no foreign matter cloggings in the capillaries where a cooling medium is to be vaporized. CONSTITUTION:Two polyethylene naphthalate filamentous fibers (each with 250 denier and 48 filaments) are arranged in parallel with each other and plaited in an eight-strand plaiting way into a square cord texture by using a braider. This texture is then scoured with sodium alkylbenzenesulfonate as an anionic surfactant used as a detergent for the lubricant on the fibers at 60 deg.C for 20min. The xylene extraction level after removing the lubricant is <=0.30wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor binding cord, and more particularly to a motor binding cord that binds copper wires (coil ends) of a motor of a compressor of a refrigerator or an air conditioner using a CFC substitute.

[0002]

2. Description of the Related Art Conventionally, a motor binding string has been used to bind copper wires of motors of compressors such as refrigerators, freezers and air conditioners. This motor binding string is used by being immersed in the refrigerant or in contact with the refrigerant. When CFCs 11, 12, 114, 115, etc. are used as the refrigerant, the motor bundling cord can be produced by twisting or using a synthetic fiber such as polyester fiber made of commercially available polyethylene terephthalate as it is There were no performance problems with the.

However, since the above-mentioned conventional chlorofluorocarbon may damage the ozone layer of the earth, its use will be regulated in the future due to laws and voluntary regulations of the industry. As these alternative CFCs, CFC134a
(Ozone depletion coefficient 0) and Freon 22 (Ozone depletion coefficient 0.05) are being studied.

[0004]

However, when a conventional binding cord is used for a refrigerant using these alternative CFCs as a refrigerant, the monomers and oligomers present in the fibers are extracted by the refrigerant, and as a result, they are extracted in the refrigerant. The current leaks, causing an abnormal current and causing a problem of blowing the fuse. Under such circumstances, many electric appliance manufacturers have strongly demanded the development of a motor binding string that exhibits the same performance as the conventional one even when the alternative CFC is changed.

To meet these demands, the present inventors have proposed that the emulsifier and antistatic agent constituting the synthetic fiber oil agent should be selected from anionic type.
No. 461 publication.

[0006] In Japanese Utility Model Laid-Open No. 4-128063, it is proposed to remove the above oil agent by boiling and washing a conventional motor bundling string for use. However,
Although these methods solve the problem of current leakage under specific conditions, another major problem is that the problem of foreign matter clogging in the capillary that vaporizes the refrigerant has not been improved. found. If this problem is not improved, the refrigerant is not sufficiently circulated due to clogging, and therefore, the cooling is not sufficiently performed, and the replacement of chlorofluorocarbon cannot proceed. Further, in the case of a rotary type motor in which the motor is immersed in a refrigerant, it is not necessarily in a completed state.

The present invention has been made in view of the above circumstances, and provides a motor bundling string which is suitable for a CFC substitute, does not deteriorate electric insulation, and does not cause foreign matter clogging in a capillary for vaporizing a refrigerant. The purpose is to

[0008]

In order to achieve the above object, the motor tying cord of the present invention is made of synthetic fiber, and the xylene extraction amount after removing the oil agent adhering to the synthetic fiber is It is characterized by being 0.30% by weight or less.

Further, in the above construction, the synthetic fiber is at least one selected from ethylene naphthalate type polymers, polyphenylene sulfide, and aromatic polyamide.
Preferably three.

Further, in the above constitution, it is preferable that the synthetic fiber is a polyethylene naphthalate or a copolymer containing an ethylene naphthalate component. Further, in the above structure, it is preferable that the xylene extraction amount is in the range of 0.01 to 0.25% by weight.

[0011]

According to the structure of the present invention, the motor binding cord is made of synthetic fiber, and the amount of xylene extracted after removing the oil agent contained in the synthetic fiber is 0.30% by weight or less. Thus, it is possible to realize a motor binding string that does not reduce electric insulation and does not cause foreign matter clogging in a capillary that vaporizes a refrigerant. In the above, the removal of the oil agent includes, for example, washing with water, warm water, boiling water and the like, scouring using a surfactant and the like, or treatment with a solvent and the like. Further, the motor binding string of the present invention is a CFC that does not contain a chlorine atom, which is considered to be a cause of ozone layer destruction, and a CFC that contains a hydrogen atom so as to decompose in the atmosphere before reaching the stratosphere, for example, Freon 134a, 123, 1
It can be suitably used for a motor or the like that uses alternative CFCs such as 41b, 22, 142b, 152b as a refrigerant. As a result,
It can be suitably used for refrigerators, freezers, air conditioners, etc. using alternative CFCs. Further, if at least one synthetic fiber selected from ethylene naphthalate-based polymer, polyphenylene sulfide, and aromatic polyamide is used, even if it is used for a motor using a CFC substitute as a refrigerant,
It is possible to realize a motor binding string that does not reduce electric insulation and does not cause foreign matter clogging in a capillary that vaporizes a refrigerant. Further, when a fiber made of a polyethylene naphthalate or a copolymer containing an ethylene naphthalate component is used, the amount of xylene extracted is extremely low, and the electrical insulating property is reduced even when used in a motor using a CFC substitute as a refrigerant. Therefore, it is possible to realize a particularly excellent motor binding string that does not cause clogging of foreign matter in the capillary that vaporizes the refrigerant.

[0012]

The present invention will be described more specifically with reference to the following examples. In order to solve the problems of the prior art, the present inventors, after the occurrence of clogging of foreign substances in the capillary that vaporizes the refrigerant, and after removing the oil agent attached to the synthetic fiber,
As a result of detailed examination of the relationship with the xylene extraction amount, it was found that the xylene extraction amount should be 0.01 or more and 0.30% by weight or less in order to prevent clogging of foreign matter.

Next, the amount of xylene extracted was measured after removing the oil agent adhering to the synthetic fibers of various synthetic fibers available on the market and a binding string composed of these synthetic fibers. To measure the amount of xylene extracted, the binding cord was washed with petroleum ether to remove the oil agent adhering to the synthetic fiber, and then dried, and the weight was measured to 4 decimal places (this weight is A), Extraction treatment was performed for 8 hours in boiling xylene. Then, it was washed with warm new xylene and then dried, and the weight was measured to four decimal places (this weight is referred to as B), and the xylene extraction amount was obtained from the following formula (Equation 1).

[0014]

[Equation 1]

The main measurement results are shown in (Table 1).

[0016]

[Table 1]

From Table 1, it is extremely difficult for the current polyethylene terephthalate fiber to reduce the xylene extraction amount to 0.30% by weight or less after removing the oil agent adhering to the synthetic fiber. I understand. In addition, even in the high viscosity type polyethylene terephthalate that is generally used for industrial materials, although the xylene extraction amount is reduced,
It can also be seen that it is insufficient to prevent the clogging of foreign substances in the capillary that vaporizes the refrigerant. Furthermore, even if these polyethylene terephthalate fibers and polyphenylene sulfide or metaphenylene terephthalamide (“Nomex” manufactured by DuPont) are used in combination, they reach the goal of the present invention although they are superior to the current polyethylene terephthalate fibers. Can not.

On the other hand, polyphenylene sulfide, metaphenylene terephthalamide, and paraphenylene terephthalamide ("Kevlar" manufactured by DuPont) can easily reach the object of the present invention. In particular, polyethylene naphthalate has a very low xylene extraction amount of 0.05% by weight, and is suitable as a material for a motor binding string. Furthermore, the glass transition point and melting point of the polyethylene naphthalate fiber are 113 ° C. and 273 ° C., respectively, which are higher than 67 ° C. and 265 ° C. of the polyethylene terephthalate fiber, which is more advantageous for a motor binding string which requires heat resistance. The flexibility of the binding cord made of these synthetic fibers is slightly stiffer than that of polyethylene terephthalate fiber, but it is hard to fluff, and the binding property in an automatic racing machine is almost the same as the current product. It is suitable.

The polyethylene naphthalate used in this example is a polyester fiber containing naphthalene-2,6-dicarboxylic acid as a main acid component and ethylene glycol as a main diol component. Moreover, you may use what was synthesize | combined as a copolymerization or a mixed polyester by adding a 3rd component. As the third component, for example, alicyclic dicarboxylic acid such as adipic acid, or isophthalic acid,
Aromatic dicarboxylic acids such as diphenyldicarboxylic acid can be used. Further, an additive such as a matting agent such as titanium dioxide may be contained.

As a concrete method of manufacturing the motor binding cord, the methods proposed in Japanese Patent Publication No. 46-30972, Japanese Patent Publication No. 46-30973, Japanese Patent Laid-Open No. 52-107319 and the like are adopted. The fibers may be filaments (long fibers) or spun yarns using staples (short fibers). The obtained fiber is twisted and twisted into two or three strands, or 4 sets, 8 sets, 16 sets, 24 sets,
It is used in the state of braid such as 32 pairs. Further, it may be a string-like body in which a sewing thread is sewn into a twisted thread. The obtained string-like body can be used as it is. However, it is desirable that the oil agent adhering to the fibers be removed by washing before use. It can be easily removed with water, warm water, boiling water, etc., but it can be removed more efficiently by using a scouring agent and a cleaning agent together. At this time, if the scouring agent / cleaning agent used in combination is selected from anionic surfactants,
It is advantageous in terms of preventing current leakage. Specific examples of the anionic surfactant include soap, N-acyl amino acid salt, alkyl ether carboxylate, carboxylate such as acylated peptide, alkylsulfonate, alkylbenzene and alkylnaphthalenesulfonate, and sulfosuccinate. Acid salts, sulfonates such as α-olefin sulfonates, N-acyl sulfonates, sulfated oils, alkyl sulfates, alkyl ether sulfates, sulfate ester salts such as alkyl amide sulfates, alkyl phosphates, Examples thereof include phosphoric acid ester salts such as alkyl ether phosphate and alkyl allyl ether phosphate.

Of course, higher-order processing such as dyeing and heat setting may be performed. With the above-mentioned configuration, it shows excellent electric insulation even when used in a motor using alternative CFCs, and prevents foreign substances from clogging the capillaries that vaporize the refrigerant. We were able to prevent the occurrence of problems such as air conditioners and air conditioners that stopped functioning on the way.

Specific examples will be described below. (Example 1) Two polyethylene naphthalate filament fibers (250 denier, 48 filaments) were aligned and assembled into a square-punched structure with 8 shots using a stringing machine. As a cleaning agent for the oil agent, sodium alkylbenzene sulfonate, which is an anionic surfactant, was used and scouring was performed at 60 ° C. for 20 minutes.

The tensile strength of the obtained braid is 28.3 k.
The elongation was 10.8% and the knot strength was 12.4 kg. The basis weight and the number of assembled pitches are 0.505 g / m and 2 respectively.
4.0 p / in. Met. The amount of xylene extracted from this braid was measured and found to be 0.045% by weight. The obtained braid was immersed in Freon 134a containing 10% by weight of polyalkylene glycol, and the leak current was measured.
Both before and after the immersion, there was no change and both were 0.4 mA or less, and the insulation characteristics were excellent. The lacing property of the automatic lacing machine for assembling the copper wire of the binding cord motor was not different from the current polyethylene terephthalate fiber, and no fluffing property or other problems were found.

A refrigerator equipped with a compressor having a motor using the thus obtained motor binding cord was used, and a refrigerator using Freon 22 as a refrigerant was operated for several months. Foreign substances were also contained in the capillary for vaporizing the refrigerant. No clogging was observed and no problems occurred.

(Example 2) Four polyethylene naphthalate filament fibers (1000 denier, 192 filaments) were used and assembled into a square-punched structure by 4 shots using a stringing machine. The tensile strength of the obtained braid is 30.1k
g, elongation 13.7%, knot strength 15.4 kg. The basis weight and the number of assembled pitches are 0.468 g / m and 8.0 p / in. Met. The scouring for removing the oil solution was performed in the same manner as in Example 1. The amount of xylene extracted from this braid was measured and found to be 0.060% by weight. The braid thus obtained was dipped in Freon 134a containing 10% by weight of polyalkylene glycol, and the leak current was measured. As a result, both before and after the immersion were 0.4 mA or less, and the insulation characteristics were excellent. The lacing property of the automatic lacing machine for assembling the copper wire of the binding cord motor was not different from the current polyethylene terephthalate fiber, and no fluffing property or other problems were found.

A compressor incorporating a motor using the thus obtained motor binding cord was installed and a refrigerator using Freon 134a as a refrigerant was operated for several months, but foreign matter was also contained in the capillary for vaporizing the refrigerant. No clogging was observed and no other problems occurred.

As described above, according to this embodiment, a motor made of synthetic fiber and having an xylene extraction amount of 0.30% by weight or less after removing the oil agent adhering to the synthetic fiber is used. Even if a tie string, for example, a motor tie string made of polyethylene naphthalate fiber is used for a motor using a refrigerant such as Freon 134a, the electric insulation is not deteriorated, and foreign matter is not clogged in the capillary that vaporizes the refrigerant. It is possible to realize a motor binding string that does not cause it.

[0028]

As described above, according to the motor tying cord of the present invention, the xylene extraction amount after the oil agent attached to the synthetic fiber is 0.3 is made of synthetic fiber.
When the content is 0% by weight or less, it is possible to provide a motor binding string that does not deteriorate electric insulation and does not cause foreign matter clogging in a capillary that vaporizes a refrigerant. Therefore, chlorofluorocarbons 134a, 123, 141b, 22, containing hydrogen atoms in addition to halogen atoms in methane or ethane-based carbon,
It can be suitably used for a motor or the like that uses alternative CFCs such as 142b and 152a as a refrigerant. Also, when binding to the motor, the work can be performed efficiently, rationally, and inexpensively.

Further, when the synthetic fiber is at least one selected from ethylene naphthalate type polymer, polyphenylene sulfide and aromatic polyamide, the electrical insulation is not deteriorated, and clogging of foreign matter occurs in the capillary for vaporizing the refrigerant. It is possible to provide a motor tying cord that does not allow it.

When the synthetic fiber is a polyethylene naphthalate or a copolymer containing an ethylene naphthalate component, the amount of xylene extracted is extremely low, the electric insulation is not deteriorated, and foreign substances are clogged in the capillary for vaporizing the refrigerant. It is possible to obtain a particularly excellent motor binding cord that does not cause

Claims (4)

[Claims] 1. A synthetic fiber, wherein the amount of xylene extracted after removing the oil agent adhering to the synthetic fiber is 0.
A motor tying string, which is 30% by weight or less. 2. The motor binding string according to claim 1, wherein the synthetic fiber is at least one selected from ethylene naphthalate-based polymers, polyphenylene sulfide, and aromatic polyamide. 3. The motor binding string according to claim 1, wherein the synthetic fiber is a polyethylene naphthalate or a copolymer containing an ethylene naphthalate component. 4. The xylene extraction amount is 0.01 or more and 0.25.
The motor tie string according to claim 1, wherein the range is less than or equal to wt%.