JP3248673B2 - Insert resin molded products and molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an insert resin molded product and a molded product. The present invention can be used for, for example, a connector.

[0002]

2. Description of the Related Art The prior art will be described with reference to a connector as an example of an insert resin molded product. The connector is formed by insert molding so as to surround the metal terminal with a resin portion. Therefore, the connector includes a resin portion and metal terminals surrounded by the resin portion and exposed from the resin portion.

[0003]

In the above-mentioned connector, although the resin portion integrally surrounds the metal terminal by insert molding, a minute interface gap exists between the resin portion and the metal terminal. . Depending on the use environment, the gap width of the interface gap may increase due to a difference in thermal expansion between the resin portion and the metal terminal. In this case, moisture or the like may enter the interface gap. When moisture enters,
The resin may deteriorate due to hydrolysis or the like.

The present invention has been made in view of the above circumstances, and has as its object to provide an insert resin molded article and a molded article that are advantageous for suppressing entry of moisture and the like into an interface gap.

[0005]

According to a first aspect of the present invention, there is provided an insert resin molded product surrounded by a resin portion and a resin portion.
An insert resin molded product having an exposed metal insert member, having a viscosity of 0.5 to 3 Pa · s in an interface gap between the resin portion and the insert member, and following a change in the interface gap. filler with a gender and is characterized in that it is loaded is penetrated.

According to a second aspect of the present invention, there is provided a molded product comprising a resin part and a resin part.
Metal insert member that is surrounded by and exposed from the resin part
And a molded product having an interfacial gap, wherein a filler mainly composed of a gel-like substance having a viscosity of 0.5 to 3 Pa · s is infiltrated and charged into the interfacial gap. Is what you do.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An insert resin molded product according to a first aspect includes a resin portion and a metal insert member surrounded by the resin portion . Inserts member is exposed from the resin portion. As such an insert resin molded product, a connector and a switch used for electric equipment and electronic equipment are typical.

The molded article according to the second aspect may be a resin molded article molded by an injection molding method or the like, or may be a molded article formed by a molding method such as a plastic working such as an extrusion working, or a cutting work. A molded product may be used, and in short, an interface gap may be provided. The interface gap means a gap generated in a boundary region between at least two types of components. Accordingly, as the molded article according to the second aspect, the molded article is typically a connector, a switch, a building material, a mechanical part, or the like used for electric equipment or electronic equipment.

According to the first aspect, a filler capable of following the fluctuation of the interface gap is loaded in the interface gap between the resin portion and the insert member. Examples of such fillers, you adopt a viscosity of 0.5~3Pa · s. This is because if the viscosity is used, the ability to follow the fluctuation of the interface gap is good. In particular, it is preferable to employ one having a pressure of 0.8 to 1.5 Pa · s. The molecular weight of the filler is 300 to 1000
, Especially 500 to 700. The above viscosity is based on the room temperature range.

A typical example of such a filler is a gel substance. The gel-like substance means a swollen body having a three-dimensional crosslinked structure. As the gel-like substance, a substance that causes gelation by a reaction of a polymer with a cross-linking agent, a substance that causes gelation at the same time as a polymer is produced, or the like can be used. Such a gel-like substance is a soft substance having a swelling property,
Good followability to fluctuations in the interface gap.

According to the second aspect, a filler mainly composed of a gel-like substance is loaded in the interfacial gap existing in the molded article. Mainly means that it may be composed only of a gel-like substance or may contain other substances. The gel substance according to claim 2 can adopt the above-mentioned gel substance. According to the first and second aspects, when loading the filler into the interfacial gap, a vacuum loading method using a vacuum, and in some cases, a loading method using an injection means such as a syringe needle can be used.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The molded product 1 is an insert molded product, specifically, a connector as an electric component. The molded article 1 includes a resin part 10 and a plurality of plate-shaped metal terminals 12 as insert members surrounded by the resin part 10 and exposed from the resin part 10.

In the molded article 1, a resin is injected into the cavity of the molding die with the metal terminal 12 disposed in the cavity of the molding die, and the metal terminal 12 is surrounded by the resin. It is formed by molding. The resin portion 10 is made of polybutylene terephthalate (PB
T), polyamide (PA), polyphenylene sulfide (PPS), aromatic nylon or the like.

The metal terminal 12 may be constituted only by a metal base material, or may be constituted by coating a metal base material with a plating layer. Copper-based, brass-based, or the like can be used as the metal base material. As the plating layer, tin, nickel, gold, silver or the like can be adopted. According to the standard, the target width of the metal terminal 12 is 0.4 inches and 0.9 inches, and the target thickness of the metal terminal 12 is 0.6 mm.

A minute interface gap 14 is formed between the metal terminal 12 and the resin portion 10. Although the gap width of the interface gap 14 varies depending on the type of the molded article 1, the use environment temperature, and the like, it is, for example, about several microns to several mm, and particularly about several hundred microns. The filler 3 is loaded in the interface gap 14 in the form of a thin film. As such a filler 3, a filler having a viscosity of 0.5 to 3 Pa · s in a normal temperature region is employed.
You. In the present embodiment, the filler 3 employs a gel-like substance formed of a polymer material. Filler 3 consisting of gel-like substance
For example, an acrylic type or an epoxy type can be used.

In the case of acrylic, a polymer such as methyl acrylate / ethyl acrylate / methyl methacrylate / acrylonitrile can be used. In the case of an epoxy-based resin, a resinous substance having two or more epoxy groups in one molecule can be employed. As a typical example, bisphenol A and epichlorohydrin are synthesized at 60 to 120 ° C. in the presence of an alkali, Those crosslinked with polyamine or phthalic anhydride can be employed.

In this embodiment, loading of the filler 3 is performed as follows. That is, as shown in FIG.
A container 6 containing a stock solution 30 of the filler 3 is arranged in a vacuum chamber 50 of the vacuum chamber 5. Then, in a state where the molded article 1 is placed in the vacuum chamber 50, the vacuum chamber 50 is sucked by the suction pump 70 and the pressure is substantially reduced. During or after the pressure reduction, the portion of the metal terminal 12 of the molded article 1 is immersed in the stock solution 30 of the container 6 for a predetermined time.

After immersion, the open / close valve 72 is opened.
A vacuum chamber 50 is communicated with the atmosphere. As a result, the filler 3 penetrates into the interface gap 14 between the metal terminal 12 and the resin portion 10 in the molded product 1. After the infiltration, the molded article 1 is taken out of the vacuum chamber 50. According to the present embodiment, the gap width of the interface gap 14 may fluctuate based on the fluctuation of the use environment temperature. This is because the thermal expansion coefficients of the metal terminal 12 and the resin portion 10 are different. Even if the gap width of the interface gap 14 fluctuates in this manner, the filler 3 loaded in the interface gap 14 can easily follow the gap width variation.

The filler 3 has a swelling property and a soft property;
When the metal terminal 12 has a surface roughness or the like, the filler 3
Is presumed to be easily engaged with the surface of the metal terminal 12.
Therefore, it is advantageous to suppress the entry of moisture and the like into the interface gap 14. Therefore, the inconvenience caused by moisture intrusion can be suppressed, which is advantageous for prolonging the life of the molded article 1. Incidentally, the metal terminal 12 has a predetermined surface roughness such that the engagement with the gel-like substance can be ensured unless a high degree of mirror finish is applied.

[0020]

According to the first and second aspects, it is advantageous to suppress the entry of moisture and the like into the interface gap. Accordingly, it is possible to suppress a problem caused by entry of moisture or the like into the interface gap.
Therefore, it is possible to contribute to extending the life of the insert molded product and the molded product.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molded product.

FIG. 2 is a cross-sectional view schematically showing a main part of a molded product.

FIG. 3 is a configuration diagram showing a step of loading a molded product with a filler.

[Explanation of symbols]

In the figure, 1 is a molded product, 10 is a resin part, 12 is a metal terminal, 1
Reference numeral 4 denotes an interfacial gap, and reference numeral 3 denotes a filler.

Claims (2)

(57) [Claims] And a resin portion surrounded by the resin portion.
A insert resin molded article and a metal insert member exposed from the interface gap between the insert member and the resin portion, 0.
An insert resin molded product, characterized in that a filler having a viscosity of 5 to 3 Pa · s and capable of following the fluctuation of the interfacial gap is penetrated and loaded. 2. A resin part and said resin part surrounded by said resin part.
A molded article having a metal insert member exposed from the surface and having an interfacial gap, wherein the interfacial gap is mainly made of a gel-like substance having a viscosity of 0.5 to 3 Pa · s. A molded article characterized by being filled with a filler.