JPH02304809A - Insulated wire - Google Patents

Abstract

PURPOSE:To employ the heat resistance of a poly-parabanic acid efficiently so as to let the title wire have solderability by limiting the kind of and the compounding quantity of stabilizing polyisocyanate being compounded with the polyparabanic acid resin to their relevant specified values. CONSTITUTION:Onto a conductor is applied and baked an insulating paint prepared through the process of adding 75 pts.wt. to 400 pts.wt. of a stabilizing. polyisocyanate compound derived from diphenylmethane diisocyanate to 100 pts.wt. of polyparabanic acid resin. Any choice of less than 75 pts.wt. of the polyisocyanate compound makes an insulated wire not solderable, while every choice of not less than 400 pts.wt. thereof causes little improvement in the heat resistance of the wire and also the flexibility of the film insulating the conductor is therefore lowered. This results in the higher glass transition temperature of and the improved heat resistance of the wire compared with conventional insulated wires, and makes the wire also solderable in the same way that the conventional polyurethane insulated wire has.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an insulated wire with excellent solderability and good heat resistance.

(Conventional technology and its problems) Polyurethane insulated wire can be used without removing the insulation film.
Since it can be soldered as is, it is widely used as winding wire for electronic devices.

Recently, equipment has become smaller and more sophisticated, the ambient temperature in which the equipment is used has increased, and there has been a demand for improved heat resistance of the parts used.

Therefore, there are some applications in which conventional polyurethane insulated wires cannot satisfy the heat resistance requirements, and polyester insulated wires and esterimide insulated wires have begun to be used in some cases.

When using the above polyester or esterimide insulated wire, the heat resistance is satisfactory, but there is a problem that it cannot be soldered, and the user has to choose whether to prioritize heat resistance or ease of terminal processing. I'm worried,
There is a strong demand for insulated wires that have both heat resistance and solderability.

As a result of intensive study on the above-mentioned problems, the present inventor maintained the excellent heat resistance of polyparapanoic acid resin by applying and baking an insulating paint containing polyparapanoic acid resin and an appropriate amount of a specific stabilized polyisocyanate onto the conductor. while doing,
We succeeded in obtaining an insulated wire that can be soldered.

Conventionally, polyparapanic acid resin has excellent heat resistance and does not have a hydroxyl group in its molecule that can react with the stabilized polyisocyanate to form urethane bonds that provide solderability, so it has been formulated with stabilized polyisocyanate. However, it was thought that it was not possible to achieve solderability without reducing heat resistance.

However, by limiting the type and amount of stabilizing polyisocyanate blended into the polyparapanoic acid resin, the present inventors were able to take advantage of the heat resistance of the polyparapanoic acid resin and successfully impart solderability to the polyparapanoic acid resin. It is.

(Structure of the Invention) The present invention is characterized in that an insulating paint in which 75 to 400 parts by weight of a stabilized polyisocyanate compound obtained from diphenylmethane diisocyanate is added to 100 parts by weight of polyparapanic acid resin is applied and baked on a conductor. This is an insulated wire.

In the present invention, polyparapanic acid resin refers to one having the general formula shown below.

In the above general formula, R represents an aliphatic residue or an aromatic residue,
In the present invention, aromatic residues are preferred.

Specific examples of aromatic residues include the following.

CHa Furthermore, the above aromatic hydrogen atom is CHa, CH3C
Alkyl groups such as H2, CH2=CH-, CH2=CH
-(: Alkenyl group such as Hz-1, Br, C(1,
It may be substituted with a halogen such as.

Commercialized examples of the above polyparapanic acid include Trulac, manufactured by Tonen Petrochemical Co., Ltd., which is represented by the following chemical structural formula.

Stabilized polyisocyanate obtained from diphenylmethane diisocyanate is diphenylmethane diisocyanate alone, or polyisocyanate obtained by reacting diphenylmethane diisocyanate with a polyol, polyamine, polycarboxylic acid, etc. The isocyanate group is combined with phenols, alcohols, caprolactam, etc. Any compound blocked with a known bronching agent such as the following can be used.

Specific examples include Coronate 2503 (manufactured by Nippon Polyurethane Co., Ltd.), which is a polyisocyanate obtained from diphenylmethane diisocyanate and a polyol blocked with phenols, and Millionaire (M S-50, manufactured by Nippon Polyurethane Co., Ltd.), which is made by blocking diphenylmethane diisocyanate with phenols.

etc.

The present invention is not effective with stabilized polyisocyanates other than those obtained from diphenylmethane diisocyanate.

For example, when using a stabilized polyisocyanate obtained from a polyol and tolylene diisocyanate, the solderability is good, but the flexibility of the insulating film is poor; When a stabilized polyisocyanate containing an incyanuric ring is used, the insulating film has good flexibility but cannot be soldered.

In the present invention, 75 to 400 parts by weight of a stabilized polyisocyanate compound obtained from diphenylmethane diisocyanate is added to 100 parts by weight of the polyamide-imide resin.
It is necessary to add parts by weight.

If it is less than 75 parts by weight, the obtained insulated wire will not be solderable, and if it is more than 400 parts by weight, the heat resistance of the obtained insulated wire will be little improved and the flexibility of the insulating film will also be reduced.

Solvents used in the insulating paint of the present invention include NM2P and DM, which are used as solvents for polyparapanic acid resin.
A combination of AC, DMF, etc. and a diluent such as solvent naphtha, toluene, xylene, etc. is preferred, but phenols and cresols used in ordinary baking paints can also be used.

If necessary, a temperature curing catalyst such as naphthenic acid, a metal salt of octenoic acid, or a tertiary amine can be used in the insulating coating of the present invention.

The insulating paint of the present invention includes thermoplastic resins such as polyvinyl formal and polyamide, to the extent that the characteristics of the present invention are not impaired.
It is also possible to add thermosetting resins such as epoxy resins, melamine resins, and phenolic resins, fillers, pigments, dyes, surfactants, lubricants, and the like.

The present invention will be explained in detail in the following examples, but the present invention is not limited to these examples.

(Comparative Example 1) General-purpose polyurethane paint (TPU-515 manufactured by Tsukoku Toyo Co., Ltd.
5) was coated and baked on a 0.3 mm y copper conductor so that the film thickness was 0.020 mark. Table 1 shows the results of measuring the general characteristics (structure, flexibility, solderability) and glass transition temperature of the insulating film of the obtained polyurethane insulated wire.

(Comparative Example 2) Heat-resistant polyurethane paint (ATH-60 manufactured by Auto Kagaku Co., Ltd.)
5) in the same manner as Comparative Example 1, a polyurethane insulated wire was produced and its characteristics were evaluated.

The results are shown in Table 1.

(Example 1) Coronet (manufactured by Nippon Polyurethane Co., Ltd.) 2503, which is a stabilized polyisocyanate obtained from a polyol and diphenylmethane diisocyanate, based on 100 parts by weight of the resin content of polyparapanic acid insulation paint (Tsurlac XT-4, manufactured by Tonen Petrochemical Co., Ltd.) (Corone (hereinafter referred to as C)) (abbreviated as 2503)
An insulated wire was prepared and its characteristics were evaluated in the same manner as in Comparative Example 1 using an insulating coating material in which 200 parts by weight of 200 parts by weight were added and dissolved.

The results are shown in Table 1.

(*Example 2, 3) The amount of Coronate 2503 added to 100 parts by weight of the resin content of the polyparapanic acid insulation paint was 100 parts by weight (Example 2).
), 300 parts by weight (Example 3), an insulated wire was produced and its characteristics were evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Examples 3 and 4) The amount of Coronate 2503 added was 50 parts by weight based on 100 parts by weight of the resin content of the polyparapanic acid insulation paint (Comparative Example 3)
, 500 parts by weight (Comparative Example 4), an insulated wire was produced and its characteristics were evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Example 4. Comparative Examples 5 and 6) Millionate Ms-50, a stabilized polyisocyanate obtained from diphenylmethane diisocyanate instead of Coronate 2503 (Example 4) A stabilized isocyanate obtained from polyol and tolylene diisocyanate. A certain desmodule Ap stable (comparative example 5),
Insulated wires were produced and their characteristics were evaluated in the same manner as in Example 1, except that Desumodur CT Stable (Comparative Example 6), which is a stabilized isocyanate containing an incyanuric ring, was used.

The results are shown in Table 1.

(Effects of the Invention) As explained above, the insulated wire of the present invention has a higher glass transition temperature and improved heat resistance than conventional wires.

Additionally, it can be soldered in the same way as conventional polyurethane insulated wires. Therefore, the industrial value of the present invention is great.

Claims (3)

[Claims] (1) An insulated wire characterized by coating and baking on a conductor an insulating paint made by adding 75 to 400 parts by weight of a stabilized polyisocyanate compound obtained from diphenylmethane diisocyanate to 100 parts by weight of polyparapanic acid resin. . (2) The insulated wire according to claim 1, wherein the stabilized polyisocyanate compound obtained from diphenylmethane diisocyanate is a polyisocyanate compound obtained by stabilizing the isocyanate groups of diphenylmethane diisocyanate with a blocking agent. (3) The insulated wire according to claim 1, wherein the stabilized polyisocyanate compound obtained from diphenylmethane diisocyanate is a stabilized polyisocyanate compound obtained by stabilizing the polyisocyanate obtained from a polyol and diphenylmethane diisocyanate with a blocking agent.