JPH03119609A - Insulated electric wire - Google Patents

Abstract

PURPOSE:To improve and/or to give the soldering property together with the lubricating property and flame resistance and not to lower the other properties in an insulate electric wire by coating an enameled wire with a prescribed paint, and baking it. CONSTITUTION:A paint prepared by dissolving 100wt. part of a polyamide resin and 5-100wt. part of a bromic compound dissolved in an organic solvent or a solution prepared by adding 1-50wt.% of a lubricant to the above solution is used as a prescribed paint. A polyvinyl formal insulated wire, for example, is used as the base enameled wire, while an aliphatic polyamide resin desirable as the polyamide resin and a natural wax, for example, is used as the lubricant. By coating and baking this paint, soldering without peeling off an insulation layer can be applied at a lower temperature than that of the base enameled wire with an improvement of property, while the lubricating property, flame resistance and the other properties are maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an insulated wire. More specifically, the present invention relates to an insulated wire with excellent solderability, lubricity and flame retardancy.

[Prior Art] Enameled wires currently in widespread industrial use include formal wires, polyurethane wires, polyester wires, polyetherimide wires, polyamide-imide wires, and polyimide wires. There is also a composite enameled wire made by coating and baking these paints or other paints into upper and lower layers.

There are various criteria for selecting enamelled wires by electrical equipment designers.

Generally, the first layer is the temperature rating of the electrical equipment, and the second layer is environmental factors other than temperature, such as varnish resistance, solvent resistance, refrigerant resistance, moist heat resistance, etc. The second layer also has flame retardancy.

On the other hand, criteria for selecting enamelled wires by electrical equipment manufacturers include wear resistance, flexibility, lubricity, softness, brazing properties, etc.

Here, brazeability refers to a property that allows soldering without peeling off the insulating layer of the enameled wire.

Among these, wear resistance, flexibility, lubricity, and softness are characteristics related to prevention of processing deterioration during coil winding. On the other hand, brazeability is a property related to the terminal processing properties of a wound electrical equipment coil.

Polyester wire, which accounts for about 40% of Japan's enamelled wire production, and formal wire, which accounts for about 7%, do not have brazing properties. Of course, heat-resistant enameled wires such as polyamide-imide wires and polyimide wires do not have brazing properties. In order to process the terminals of enameled wires that do not have brazing properties, the insulating layer is peeled off using methods such as stripping agent immersion stripping, acid immersion stripping, alkaline solution immersion stripping, mechanical stripping, and incineration stripping before soldering. , it takes time to peel off, which is an obstacle to increasing the productivity of electrical equipment coils.

There are two types of enameled wires that have brazing properties: polyurethane wires and brazing polyesterimide wires mainly made of glycerin-based polyesterimide.

Polyurethane wires include general-purpose polyurethane wires for their brazing properties, low-temperature brazing polyurethane wires that can be soldered at temperatures several dozen degrees lower than general-purpose polyurethane wires, and imide-modified polyurethane wires with improved heat resistance than general-purpose polyurethane wires. etc.

This type of brazeable enamelled wire has problems in terms of balance with other properties.

In other words, low-temperature brazing polyurethane wires with lower brazing temperatures have the disadvantage that their heat resistance is greatly reduced.
Furthermore, polyurethane wires with improved heat resistance, imide-modified polyurethane wires, brazeable polyester imide wires, etc. have the disadvantage that the brazing temperature increases significantly.

For this reason, wire manufacturers offer grades of general-purpose enameled wire, low-temperature brazing enameled wire, and heat-resistant enameled wire to meet customer needs. Naturally, this increase in product types is one of the factors pushing up manufacturing costs.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above,
Without reducing other properties, we use insulated wires with a lower brazing temperature for enameled wires that have brazing properties, and for enameled wires that do not inherently have brazing properties, we use insulated wires that have brazing temperatures on the lower side. It is an object of the present invention to provide an insulated wire that is endowed with an insulated wire that has excellent lubricity and flame retardancy in any case.

[Means for solving the problem of bubbles] The gist of the present invention is to apply a coating composition containing a polyamide resin and a bromine compound, or a coating composition containing a polyamide resin, a bromine compound, and a lubricant to an enameled wire. This is an insulated wire made by coating and baking enamelled wire.

The enameled wire used as the base enameled wire in the present invention may be any one that is industrially used, and for example, formal wire, polyurethane wire, polyester wire, polyesterimide wire, etc. can be used.

Various types of polyamide resins can be used in the present invention, but desirably aliphatic polyamide resins such as 6 nylon, 66 nylon, 61G nylon, 11 nylon,
12 nylon, copolymerized nylon, etc. are suitable.

The bromine compound used in the present invention is preferably one that is compatible with the polyamide resin and that allows the mixed paint to be coated and baked on the conductor with good appearance.For example, brominated bisphenol A and various derivatives of brominated bisphenol A, bromine Glycidyl ethers such as brominated cresol monoglycidyl ethers, brominated alkylphenyl glycidyl ethers, brominated epoxy resins such as brominated phenol novolac type epoxy resins, brominated epoxy resins, etc. can be used.

The lubricants used in the present invention include natural waxes, mineral waxes, higher fatty acids and derivatives thereof, and fine particles of lubricating resins. Natural waxes include carnauba wax, beeswax, and montan wax. Mineral oil waxes include paraffin waxes having various melting point ranges. Examples of higher fatty acids and their derivatives include stearic acid, oleic acid, lauric acid, and derivatives thereof.

Furthermore, the lubricating resin particles include olefin resin particles, fluororesin particles, and the like.

The reason why the amount of additives added to the polyamide resin is limited in the present invention is as follows.

First, the reason why the amount of the bromine compound blended is 5 to 100 parts by weight with respect to 100 parts by weight of the polyamide resin is that if it is less than 5 parts by weight, there is no noticeable improvement in the brazeability and flame retardance of the resulting enameled wire. On the other hand, if the amount exceeds 1 part of 100ffif, the stability of the coating material deteriorates, and furthermore, the effect of improving brazing properties and flame retardance in proportion to the amount blended cannot be obtained.

In addition, 0.00 parts of lubricant was added to 100 parts by weight of polyamide resin.
The reason why the amount is 1 to 50 parts by weight is that if it is less than 0.1 part by weight, there is no significant effect of improving the lubricity of the enameled wire obtained, whereas if it is more than 50 parts by weight, the stability of the coating deteriorates. This is because the effect of improving lubricity proportional to the amount blended cannot be obtained.

[Function] The insulated wire of the present invention can be manufactured by applying and baking a paint made by dissolving 100 parts by weight of a polyamide resin and 5 to 100 parts by weight of a bromine compound in an organic solvent onto the enameled wire. The overcoat layer provides excellent lubricity, and at temperatures above 220°C, where the solder melts, molecular exchange occurs between these layers and the entire insulating layer exhibits hot-melt properties, which further causes combustion. At temperatures above 500°C, nitrogen gas and hydrogen bromide are generated from the polyamide resin and the chloride compound to effectively exhibit self-extinguishing properties.

and 100 parts by weight of polyamide resin, 5 to 1 part of bromine compound
By applying and baking a paint made by dissolving 0.00 parts by weight and 0.1 to 50 parts by weight of a lubricant in an organic solvent onto the enameled wire, the lubricity due to the overcoat of polyamide resin to odor compound can be further improved at room temperature. In addition, at temperatures above 220°C, where solder melts, molecular exchange occurs between these layers, making the entire insulating layer exhibit hot-melt properties, and at temperatures above 500°C, where combustion occurs, polyamide resin to bromine The purpose is to generate nitrogen gas and hydrogen bromide from a compound to effectively exhibit self-extinguishing properties.

[Example] Next, a comparative example of a conventional insulated wire and an example of an insulated wire of the present invention will be described.

Comparative Example 1 By applying and baking polyurethane paint on a conductor wire with a conductor diameter of 0.4511φ, the thickness of the insulating layer was 0.02 mm.
A polyurethane wire was obtained.

Comparative Example 2 A polyester wire with an insulating layer thickness of 0.02 inch was obtained by coating and baking a polyester paint on a conductor wire having a conductor diameter of 0.45 inch.

Comparative Example 3 A polyurethane paint was coated and baked on a conductor wire with a conductor diameter of 0.45-layer φ to obtain a polyurethane wire with an insulating layer thickness of 0.02-layer.

Next, the obtained insulating layer has a thickness of 0.02 mm on top of the polyurethane wire with a thickness of 0.02 mm.
An insulated wire was obtained by applying and baking 66 nylon paint to a thickness of 0.02 m.

The 66 nylon paint used here was a paint with a resin concentration of 15% dissolved in a mixed solvent of m-cresol and kijirole.

Comparative Example 4 A polyester paint was coated and baked on a conductor wire with a conductor diameter of 0.45 snφ to obtain a polyester wire with an insulating layer thickness of 0.02 mm.

Next, the obtained insulating layer has a thickness of about 0.02 on the upper layer of the polyester wire.
An insulated wire was obtained by applying and baking 66 nylon paint on the two sides.

Comparative Example 5 The conductor diameter obtained in Comparative Example 4 was 0.45 mmφ, and the thickness of the insulating layer was 0.
．． By applying and baking a paint containing 3 parts by weight of tetrabromobisphenol A to 100 parts of resin in a 15% 66 nylon solution on a 0.2 m polyester wire so that the thickness of the insulating layer was 0.002 mm. Obtained insulated wire.

Comparative Example 6 On the polyester wire obtained in Comparative Example 4 with a conductor diameter of 0.45 inφ and an insulating layer thickness of 0.02 m, 110 parts by weight of tetrabromobisphenol A was added to 100 parts by weight of the resin content of the 15% 66 nylon solution. An insulated wire was obtained by applying and baking the mixed paint so that the thickness of the insulating layer was 0.002 mm.

Comparative Example 7 On the polyester wire obtained in Comparative Example 4 with a conductor diameter of 0.45+*mφ and an insulating layer thickness of 0.02 fin, tetrabromobisphenol A was added to 100 parts by weight of the resin content of a 15% 66 nylon solution. An insulated wire was obtained by applying and baking a paint containing 30 parts by weight of 30 parts by weight of beeswax and 0.05 parts by weight of beeswax so that the thickness of the insulating layer was 0.002 fins.

Comparative Example 8 The conductor diameter obtained in Comparative Example 4 was 0.45 mm, and the thickness of the insulating layer was 0.
．． On the polyester wire of 02, apply a paint containing 30 parts by weight of tetrabromobisphenol A and 60 parts by weight of beeswax to 100 parts by weight of resin of 15% 66 nylon solution, with an insulating layer thickness of 0.002 m. An insulated wire of 71 was obtained by coating and baking so that the result was as follows.

Example 1 On the polyurethane wire obtained in Comparative Example 3 with a conductor diameter of 0.45 mmφ and an insulating layer thickness of 0.02 μl, tetrabromobisphenol A was added to 100 parts by weight of the resin content of a 15% 66 nylon solution. An insulated wire was obtained by applying and baking a paint containing 10 parts by weight so that the thickness of the insulating layer was 0.002 m.

Example 2 An insulated wire was obtained in the same manner as in Example 1, except that 30 parts by weight of tetrabromobisphenol A was added to 10 parts by weight of the resin in the 15% 66 nylon solution.

Example 3 An insulated wire was obtained in the same manner as in Example 1, except that 50 parts by weight of tetrabromobisphenol A was added to 100 parts by weight of the resin content of the 15% 66 nylon solution.

Example 4 An insulated wire was obtained in the same manner as in Example 1 except that 100 parts by weight of tetrabromobisphenol A was added to 100 parts by weight of the resin content of the 15% 66 nylon solution.

Example 5 On the polyester wire obtained in Comparative Example 4 with a conductor diameter of 0.45 m1φ and an insulating layer thickness of 0.02 mm, 10 ffiffi of tetrabromobisphenol A was added to 100 parts by weight of the resin content of the 15% 66 nylon solution. An insulated wire was obtained by applying and baking the mixed paint so that the thickness of the insulating layer was 0.002 am.

Example 6 An insulated wire was obtained in the same manner as in Example 5, except that 30 parts by weight of tetrabromobisphenol A was added to 100 parts by weight of the resin content of the 15% 66 nylon solution.

Example 7 An insulated wire was obtained in the same manner as in Example 5, except that 50 parts by weight of tetrabromobisphenol A was added to 100 parts by weight of the resin content of the 15% 66 nylon solution.

Example 8 An insulated wire was obtained in the same manner as in Example 5, except that 100 parts by weight of tetrabromobisphenol A was added to 100 parts by weight of the resin content of the 15% 66 nylon solution.

Example 8 The conductor diameter obtained in Comparative Example 4 was 0.45 mm and the thickness of the insulating layer was 0.
．． 0.02 mm thick polyester wire was coated with a paint containing 30 parts by weight of tetrabromobisphenol A and 0.1 part by weight of beeswax, based on 100 parts by weight of the resin content of a 15% 66 nylon solution, so that the thickness of the insulating layer was 0.002 mm. An insulated wire was obtained by coating and baking to obtain the following.

Example 9 An insulated wire was prepared in the same manner as in Example 8, except that a paint containing 30 parts by weight of tetrabromobisphenol A and 0.1 part by weight of beeswax was used based on 100 parts by weight of the resin content of the 15% BB nylon solution. I got it.

Example 10 An insulated wire was obtained in the same manner as in Example 8, except that a paint containing 30 parts by weight of tetrabromobisphenol A and 1 part by weight of beeswax was used based on 100 parts by weight of the resin content of the 15% 66 nylon solution. Ta.

Example 11 An insulated wire was obtained in the same manner as in Example 8, except that a paint containing 30 ffi parts of tetrabromobisphenol A and 10 parts by weight of beeswax was used, based on 100 ffi parts of the resin content of the 15% 66 nylon solution. Ta.

Example 12 An insulated wire was obtained in the same manner as in Example 8, except that a paint containing 30 parts by weight of tetrabromobisphenol A and 50 parts by weight of beeswax was used, based on 100 parts by weight of the resin content of the 15% 66 nylon solution. .

Next, the characteristics of the insulated wires of the comparative examples and examples thus obtained were tested.

The table shows the results of testing the resin composition, paint stability, and characteristics of the obtained insulated wires of the paints used in these comparative examples and examples.

When the test insulated wire was immersed in a high-temperature solder bath for 5 seconds, it was observed whether or not the soldering tube pillar could be soldered.

○ indicates an insulated wire that is completely soldered, and × indicates an insulated wire that is not soldered.

The thermal softening test was conducted according to J 15-C-3003, and the results are expressed as the short circuit temperature between the two specimens.

Lubricity was determined by the static friction coefficient using the wire and wire method. In this case, the smaller the coefficient of static friction, the better the lubricity.

Flame retardancy was determined by making the test insulated wire into a tightly wound coil with 8 fins φ and 10 cm in length, hanging the resulting tightly wound coil in windless air, and igniting it from below with a Bunsen burner for 30 seconds.
Flammability was tested. The results were shown as ○ if the fire extinguished within 10 seconds after the Bunsen burner was released, and X if the fire continued to burn.

As can be seen from the table, the conventional polyurethane wire of Comparative Example 1 is brazed at 380°C, but its flame retardance is poor.

The conventional polyester wire of Comparative Example 2 has no wax tube pillars even at 460° C. and has poor flame retardancy.

Although the insulated wire of Comparative Example 3, which is a conventional polyurethane wire overcoated with polyamide resin, has good lubricity, no effect of improving the wax tube column and flame retardance is observed at all.

The insulated wire of Comparative Example 4, in which the conventional polyester wire was overcoated with a polyamide resin, had good lubricity, but no effect of improving the wax tube column and flame retardancy was observed.

Although the insulated wire of Comparative Example 5 has good lubricity, the amount of the bromine compound blended is so small that no effect of improving the brazed tube column and flame retardancy is observed.

Although the insulated wire of Comparative Example 6 has better lubricity and flame retardancy,
The blended amount of the bromine compound was too large, and as a result, the stability of the enamel paint deteriorated, and although not shown in the table, the appearance of the obtained insulated wire deteriorated.

In the insulated wire of Comparative Example 7, the amount of lubricant blended was too small, so no significant improvement in lubricity was observed.

Since the insulated wire of Comparative Example 8 contained a large amount of lubricant, the stability of the enamel paint deteriorated, and as a result, although not shown in this table, the appearance of the insulated wire deteriorated. Moreover, the lubricity of the obtained insulated wire did not improve in proportion to the amount added.

On the other hand, the insulated wires of Examples 1 to 4 had a much lower braze tube temperature than the conventional polyurethane wire of Comparative Example 1, and also had significantly improved flame retardancy.

In the insulated wires of Examples 5 to 8, polyester wires that originally had no brazing tube temperature could be made into brazeable insulated wires, and the flame retardance was also significantly improved.

In the insulated wires of Examples 9 to 12, the polyester wires, which originally do not have a brazing tube temperature, were made into brazeable insulated wires, and the lubricity and flame retardance were further improved.

In the examples of the present invention, two types of base enameled wires, a polyurethane wire and a polyester wire, were used, and IFI was used as a bromine compound and a lubricant, respectively, but of course, other enameled wires, bromine compounds, It goes without saying that the excellent effects of the present invention can be achieved by appropriately combining lubricants.

[Effects of the Invention] The insulated wire of the present invention can significantly lower the temperature of the brazed tube for an insulated wire with a brazed tube column, and can add a brazed tube column to an insulated wire that originally does not have a brazed tube column. Moreover, the obtained insulated wire has excellent lubricity and flame retardancy.
Industrially useful.

that's all

Claims (2)

[Claims] 1. 100 parts by weight of polyamide resin and 5 to 10 parts by weight of bromine compound
An insulated wire made by coating an enameled wire with a paint made by dissolving 0 parts by weight in an organic solvent and baking it. 2. 100 parts by weight of polyamide resin, 5 to 10 parts by weight of bromine compound
An insulated wire made by coating an enameled wire with a paint made by dissolving 0 parts by weight and 0.1 to 50 parts by weight of a lubricant in an organic solvent and baking it.