JPS5882404A - Self-fusible and adhesive insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-bonding insulated wire, and more particularly to a self-bonding insulated wire that has excellent flexibility, heat softening resistance, and high adhesive strength at high temperatures.

Conventionally, coil molded bodies for telecommunications equipment and the like have been made by winding insulated wires into a predetermined shape, then heating them with varnish-impregnated ash, and bonding and assimilating the wires between the windings. In recent years, face impregnation treatment has become a problem from the safety and hygiene aspects of the working environment, as well as from the viewpoints of productivity and economy, and there is a demand for self-bonding insulated wires that can be formed into coils using only a heat treatment process. is expanding.

Conventionally, polyvinyl butyral resin, polyvinyl formal resin, polyester resin, copolymerized polyamide resin, etc. have been used as resins constituting the adhesive layer of such self-bonding insulated wires, but these resins are Since the softening temperature is relatively low, the resulting self-bonding insulated wire cannot maintain sufficient adhesive strength at high temperatures, making it difficult to use it in rotating equipment such as motors.

In other words, the range of use of conventional self-bonding insulated wires was severely limited, as they were only used in stationary equipment used at relatively low temperatures, such as transformers and TV station yoke coils. .

On the other hand, in recent telecommunications equipment, an increasing number of companies are using insulated wires with high heat resistance such as polyether wire, polyesterimide wire, polyhydantoin wire, and polyamideimide wire for the purpose of reducing size and weight and improving reliability. Therefore, there is a strong demand for the development of self-bonding insulated wires that are compatible with such insulated wires and have high adhesive strength at high temperatures.

As a result of intensive research to meet these demands, the inventors of the present invention have developed a method of applying and drying a paint mainly composed of polyether resin and cellulose or its derivative resin onto conductors either directly or through another insulating layer. The present invention has been completed by discovering that a self-bonding insulated wire made by the above method has excellent flexibility and resistance to heat softening, and also exhibits sufficient adhesive strength even at high temperatures.

That is, the present invention is made by dissolving (a) 1.0 to 99.0% by weight of a polyether resin and (b) 99.0 to 1.0% by weight of cellulose or its derivative resin in an organic solvent. A self-bonding insulated wire characterized by coating and drying a paint directly or through another insulating layer on a conductor, together with the components (a) and (b) above, (c) 0 ．．
A paint made by dissolving 1 to 40.0% by weight of polyvalent incyanate and/or 0.1 to 20.0% by weight of an organic titanium compound in an organic solvent is applied directly onto the conductor or on other insulating materials. The present invention provides a self-bonding insulated wire characterized in that it is formed by coating and drying the layers.

The polyether resin (a) used in the present invention is as follows:
(4) Polyhydroxy polyether resin, (B) polysulfone resin, (C) polyether sulfone resin, (D)
There are polyphenylene Oquinde resins, etc., and one or two of these resins are selected depending on the heat softening temperature, the presence or absence of functional groups, etc.
More than one species is used selectively.

In addition, from the viewpoint of flexibility of the fusion coating film, it is desirable that the molecular weight of these polyether resins is 5,000 or more.

Among these polyether resins, the polyhydroxy polyether resin (4) is represented by the following structural formula.

(However, in the formula, n is a positive integer, and X is 10-1OH.

-5-1-so, -1-CH, -1 or -C- group, R8
is a water CH1 atom or an alkyl group. ) As a commercial product of the above polyhydroxy polyether resin -
is, for example, Bakelite phenoxy RIG (HlRKH
C, PKH (trade name of Union Carbide Company, USA), Eponol 0L-53-B40 (trade name of Shell Company, USA),
There are EPX-25, BPX-26- (Asahi Denka Kogyo ■ trade name), etc.

(The polysulfone resin of Bl is shown by the following structural formula.

Below is a blank space (in the formula, m is a positive integer, Y is 10-1H- -S-1-SO, -1-CH, -1 or -0- group) / CH.

Specific examples of commercially available resins include P-1
700, P-3500 (trade name of Union Carbide Company, USA), etc.

The polyether sulfone resin (C) is represented by the following structural formula.

(However, in the formula, n is a positive integer.) Specific examples of commercially available resins include PES-100P, PE
S-200P%pEs-300P (UK I.C.
There are products such as Ai Co.'s product name).

The polyphenylene oxide resin (D) is represented by the following structural formula.

(However, it is a positive integer in the formula.) Specific examples of commercially available resins include PP0-534 and Noryl 731 (trade name of General Electric Company, USA).

Next, the cellulose or its derivative resin used in the present invention is a cellulose resin, cellulose ester resin, or cellulose ether resin represented by the following structural formula.

The following margins CH, Z (however, in the formula, j is a positive integer, Z is -OH, -0NO,
, -0COR8, -OR3, -OR,OH, -0R4C
N,-OR,Co.

Na or -0R4C,H, group, R8 represents an alkyl group, and R2 represents an alkylene group. ) Among the above applicable resins, cellulose ester resins include:
There are various resins such as nitrocellulose, acetyl cellulose, cellulose acetate butyrate, and cellulose propionate. Cellulose needle resins include various resins such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, V anoethyl cellulose, and benzyl cellulose.

Such cellulose or cellulose derivative resin is
One or more types are selected and used in consideration of the heat softening temperature, the presence or absence of functional groups, etc. In particular, ethyl cellulose resin is suitable for the present invention because it greatly contributes to the improvement of adhesive strength at high temperatures, heat softening resistance, chemical resistance, flexibility, or electrical properties.

Commercially available ethyl cellulose resins include, for example, Ni-5
000, N-50, N-300, T-50, T-200
(trade name of Percules, Inc., USA).

In the present invention, the blending ratio of (a) polyether resin and (b) cellulose or its derivative resin is 1.0 to 99.9%, respectively, when only these two components are used.
The range is 0% by weight, and when adding a polyvalent isocyanate (c) described later as a third component, it is 1.0 to 9% by weight.
The range is 8.9% by weight.

If the proportion of either of these two components is less than 1.0% by weight, no effect can be expected from the combination.

In the present invention, the organic solvent for dissolving the above components and the crosslinking component described below includes N-methyl-2-pyrrolidone,
Nitrogen-containing solvents such as dimethylacetamide, cresol,
Phenolic solvents such as xylenol and phenol, ketone solvents such as cyclohenone, methyl ethyl ketone, methyl hexanone, and acetophenone, alcohols such as methyl carpitol, carpitol, ethyl cellosolve, methyl cellosolve acetate, methyl cellosolve, and isopropylbenzyl alcohol. Solvents or hydrocarbon solvents such as benzene, xylene, toluene, solvent naphtha, etc. are suitable.

Insulated wires obtained by directly applying and drying a paint made by dissolving the two components (a) and (o) in these organic solvents onto a conductor have a softening temperature of 80 to 400°C depending on the resin composition of the paint.
Since it can be freely set within the range of , it can be applied to fuse wire applications.

In addition, self-bonding insulated wires, in which the paint is coated on the conductor through another insulating layer and dried, have a coating film that is heat-resistant, but due to the combination of polyether resin and cellulose or cellulose derivative resin. Its softening temperature is ^, so it can be used as a self-bonding insulated wire with excellent adhesive strength at high temperatures.

Examples of the polyvalent isocyanate (/9) used as a crosslinking component in the present invention include tetramethylene diisocyanate, diphenylmethane-4,4'-diisocyanate,
diphenyl ether-4,4'-iy isocyanate,
Toluylene diisocyanate, Desmodur AP
Stable (product name of Bayer AG, West Germany: A reaction product of toluylene diisocyanate and polyalcohol blocked with phenols. Effective NC0 = 12%, softening point 99°C) Desmodur CT Staple (product of Bayer AG, West Germany) Name: Toluylene diisocyanate triad blocked with phenols.Effective NC0=
13.5%, softening point 110°C), Millionate MS -
50 (trade name of Nippon Po9 Cretan Kogyo Co., Ltd. Nidiphenylmethane-4,4'-diisocyanate blocked with phenols. Effective NCO = 16.!%), Desmodur VPKL-5-7005 (trade name of Bayer AG, West Germany) : alcohol-blocked isocyanate).

Furthermore, examples of organic titanium compounds include titanium alkoxides, titanium acylates, titanium chelates, and derivatives thereof.

Specific examples of the above-mentioned compounds are A-1, B-1
, TTS, TAT-21 (Nippon Soda brand name), TP
There are T, TBT, TEAT (Mitsubishi Gas Chemical ■trade name), Orgaterra) EAA (Matsumoto Pharmaceutical Industries ■trade name), etc.

In the present invention, among these crosslinking components, either or both of the polyvalent isocyanate and the organic titanium compound,
0.1 to 40.0% by weight and 0.1 to 20.0% by weight, respectively.
Use 0%.

The reason for limiting the compounding amount to the above range is that if the amount of additive is less than the lower limit, the crosslinking effect will be poor, and if it exceeds the upper limit, the crosslinking effect will be too large. This is because if the adhesive layer is applied and dried, it becomes difficult to maintain the adhesive layer in a semi-cured state, resulting in insufficient adhesion strength.

In addition to these crosslinking components, other crosslinking components such as phenol resin, melamine resin, alkyd resin, ester resin, and esterimide resin can also be used in combination.

In the present invention, a paint obtained by dissolving all of the above components in the organic solvent is applied onto the conductor directly or via another insulating layer and dried. As the other insulating layer, a layer formed by coating and baking a paint made of highly heat-resistant polyester resin, polyesterimide resin, polyhydantoin resin, polyamideimide resin, polyimide resin, etc. is suitable.

Further, when the conductor is an aluminum wire, an alumite coating may be formed on the surface and this may be used as an insulating layer.

The coating and drying conditions for the paint in the present invention (furnace type, furnace length, furnace temperature, die arrangement, number of coatings, line speed, etc.) vary depending on the conductor diameter, coating thickness, type of resin used, amount of compounding, etc. It is necessary to make adjustments so that the fusion layer of the fusion bondable insulated wire remains in a semi-cured state.

According to the self-fusing insulated wire of the present invention obtained as described above, the fusing layer is softened by heating at about 100 to 300° C. after forming the coil, and the coil is fused together.

In particular, when the crosslinking component (c) is used, a strong resin layer is formed which is cured by heating and does not soften by heating again.

The self-bonding insulated wire of the present invention has excellent flexibility, heat softening resistance, electrical properties, chemical resistance, and solvent resistance.
Furthermore, since the adhesive strength between wires and the adhesive strength at high temperatures are high, it can be applied not only to coils of stationary equipment but also to coils of rotating equipment with high heat resistance.

Next, examples will be described.

Examples 1 to 7 A polyimide hydantoin ester copper wire with a conductor diameter of 0.5 u (see Comparative Example 2) was coated with a paint containing each component shown in Examples 1 to 7 in Table 1 dissolved in an organic solvent, and It was introduced into a vertical baking furnace with a length of 3 m and a furnace temperature of 280 °C to form a fused layer and a film thickness of 0.
A self-bonding insulated wire of 0.010 m was obtained.

Margin below Table 1 (The numbers in the table indicate overlay percentage.) 1: Tetrapter titanate *2: BX-1 is a product name of Tanemizu Kagaku ■.

Comparative Example 1 A polyimide hydantoin ester copper wire with a diameter of 0.511M (see Comparative Example 2) was coated with a paint containing the composition shown in Comparative Example 1 in Table 1 dissolved in an organic solvent and baked, using the same method as in Example. A self-bonding insulated wire was obtained.

Comparative Example 2 A copper wire with a diameter of 0.5 wr was coated with polyimide hydantoin ester paint (TVE 5416: our product name), and the furnace length was 378. The mixture was introduced into a vertical baking furnace with a furnace temperature of 350°C to obtain a polyimide hydantoin ester copper wire with an insulating layer and a film thickness of 0.020 m.

This polyimide hydantoin ester copper wire is the insulated wire used in Examples 1 to 7 and Comparative Example 1 above.

Next, the general characteristics of the self-bonding insulated wires obtained in Examples 1 to 7 and Comparative Examples 1 to 2 (comparative example 2 was a polyimide hydantoin ester copper wire) were measured, and Example 1
Regarding the insulated wires of Comparative Example 1 and Comparative Example 1, the adhesive strength was further measured.

The measurement results are shown in Table 2.

However, the test method for general properties is based on J Is C3003, and the test method for adhesive strength is based on A8TMD-251.
Based on 9, a self-fusing insulated wire was wound around a mandrel with a diameter of 4U to create a helical coil test piece with a length of about 75 m, and the test piece was heated at 200°C for 30 minutes under fusing conditions, and the test piece is shown in Table 2. In the temperature atmosphere shown, the distance between fulcrums is 44.4
A bending test was carried out at a speed of 10 bows, and the average of the measured values of three test pieces was obtained.

Margin below Table 2

Claims (1)

[Claims] 1. (a) 1.0 to 99.0% by weight of polyether resin and (Iff) 99.0 to 1.0% by weight of cellulose or its derivative resin are mixed in an organic solvent C2. A self-bonding insulated wire characterized in that it is formed by applying a dissolved paint onto a conductor directly or through another insulating layer and drying it. 2. (a) 1.0 to 98.9% by weight of polyether resin, (b) 98.9 to 1.0% by weight of cellulose or its derivative resin, and (c) 0.1 to 40% by weight. 0% by weight of polyhydric incyanate and/or 0.1-20.
1. A self-adhesive insulated wire, characterized in that it is formed by coating a paint made by dissolving 0% by weight of an organic titanium compound in an organic solvent onto a conductor directly or through another insulating layer and drying it.