JPH0619023B2 - Resin composition for metal plating having excellent heat transfer characteristics - Google Patents

Description

TECHNICAL FIELD The present invention relates to a resin composition for plating having excellent heat transfer characteristics.

More specifically, it relates to an aromatic polysulfone resin composition having excellent heat resistance, mechanical properties, and improved heat transfer properties and plating properties.

[Conventional technology]

Aromatic polysulfone resin is one of the representative engineering plastics having excellent mechanical, chemical and thermal properties.
A resin composition comprising potassium titanate fibers and an alkaline earth metal carbonate and having excellent plating characteristics has been disclosed (Japanese Patent Application No. 60-122753). However, the above composition does not have sufficient heat transfer characteristics, and there are many restrictions in terms of application. For example, recent miniaturization. When insulating parts such as IC substrates, which are highly hybridized, are plated with plastic, potassium titanate fibers and alkaline earth metal carbonates are not sufficient to improve the heat transfer characteristics of the resin composition, and considerable heat storage is required. It was accompanied by a phenomenon. Also, in order to impart heat transfer characteristics,
Metal powder such as copper, iron, aluminum and carbon black,
Carbon compounds such as graphite and carbon fibers may be used in combination, but they have not been put into practical use because they significantly impair the original insulating properties of plastics.

[Problems to be solved by the invention]

An object of the present invention is to provide an aromatic polysulfone resin composition having heat transfer characteristics and excellent plating characteristics.

[Means for solving problems]

As a result of various studies to achieve the above object, the present inventors have found that the combined use of magnesium oxide is effective in a resin composition comprising an aromatic polysulfone resin, potassium titanate fibers and an alkaline earth metal carbonate. Heading out, the present invention has been completed.

That is, the present invention uses 2 to 90 parts by weight of magnesium oxide in a composition comprising 100 parts by weight of an aromatic polysulfone resin, 2 to 60 parts by weight of potassium titanate fiber and 2 to 50 parts by weight of an alkaline earth metal carbonate. The resin composition for plating has excellent heat transfer characteristics.

The aromatic polysulfone resin used in the present invention is a linear polymer having an arylene bond (aromatic bond), an ether bond and a sulfone bond as a bond unit. For example, those having the following structural formulas are known. ing. In the structural formulas shown below, "-φ-" is a paraphenylene group.

These aromatic polysulfones are, for example, Japanese Patent Publication No. 40-1
It can be easily produced by the method described in Japanese Patent Publication No. 0067, Japanese Patent Publication No. 42-7799, Japanese Patent Publication No. 47-617, etc., and at least one kind or a mixture of two or more kinds thereof is used. Commercially available products include (1) PIC (trade name) manufactured by ICI, (2)
There is Udel (trade name) manufactured by UCC.

The potassium titanate fiber used in the present invention has the general formula K ₂ O.
A ceramic whisker represented by nTiO ₂ (n is an integer), which is manufactured from K ₂ CO ₃ , KOH, TiO _2, etc. as a raw material by a firing method, a melting method, a hydrothermal method, a flux method, a melt method, or the like. (See Plastics vol31, No8 (1980)). A typical example is K ₂ Ti ₂ O having a layered crystal structure.
₅ , K ₂ Ti ₄ O ₉ and K ₂ Ti having a tunnel crystal structure
₆ O ₁₃ , K ₂ Ti ₈ O _{17 and the} like.

The amount of potassium titanate fiber used is 2 to 60 parts by weight, preferably 5 to 100 parts by weight of the aromatic polysulfone resin.
It is 50 parts by weight. If the amount used is less than 2 parts by weight, the surface smoothness and mechanical properties of the molded product will be insufficient. If it is used in excess of 60 parts by weight, the melt fluidity at the time of molding will be significantly reduced.

Examples of the alkaline earth metal carbonate used in the present invention include carbonates of magnesium, calcium, strontium and barium, and calcium carbonate CaCO ₃ and calcium magnesium carbonate CaMg (CO ₃ ) ₂ are preferably used. The amount used is 2 to 30 parts by weight, preferably 5 to 20 parts by weight, per 100 parts by weight of the aromatic polysulfone resin. If it is less than 2 parts by weight, the plating adhesion will be poor and sufficient peel strength cannot be obtained, and if it is used in excess of 30 parts by weight, the melt fluidity will be significantly reduced.

In the present invention, aromatic polysulfone resin, potassium titanate fiber, alkaline earth metal carbonate is further mixed with magnesium oxide. Magnesium oxide used in the present invention includes metal magnesium, magnesium carbonate, basic magnesium carbonate, and hydroxide. It is manufactured by burning magnesium and the like. For example, there are light burned magnesia fired at 700 to 900 ° C. and heavy burned magnesia (clinker) fired at 600 ° C. or higher, and either can be used.

The amount of magnesium oxide used is aromatic polysulfone resin 1
2 parts by weight or more and less than 90 parts by weight, preferably 5 parts by weight or more and less than 80 parts by weight in a composition consisting of 00 parts by weight, potassium titanate fiber 2 to 60 parts by weight, and alkaline earth metal carbonate 2 to 50 parts by weight. To use. If it is 2 parts by weight or less, heat transfer characteristics cannot be imparted, and even if it is used in an amount of 90 parts by weight or more, further improvement in heat transfer characteristics cannot be expected, and conversely, the melt fluidity at the time of molding is deteriorated. It is not preferable because the mechanical properties originally possessed by the group polysulfone resin cannot be obtained.

Heat transfer characteristics of 20% by using magnesium oxide 1
It is possible to achieve an improvement of about 00%.

The plating resin composition having excellent heat transfer characteristics according to the present invention,
It is desirable that the aromatic polysulfone resin, the potassium titanate fiber, the composition of the alkaline earth metal carbonate and the magnesium oxide are uniformly mixed.

The addition and mixing method is not particularly limited, and various means can be adopted. For example, they may be separately fed to the melt extruder and mixed, or may be preliminarily mixed using a mixer such as a Henschel mixer, a ribbon blender or a tumbler, and then fed to the melt mixer. It is also possible to employ a method in which the material is dispersed in an aqueous medium or an induction medium and mixed by a wet mixing method.

As long as the effects of the present invention are not impaired, powder fillers, extenders, stabilizers, coupling agents, glass fibers, and various ceramics such as aluminum oxide, titanium oxide, and silicon carbide may be used in combination, if necessary. .

The resin composition of the present invention described above can be molded into a predetermined molded product by a molding method such as an injection molding method, an extrusion molding method, or a compression molding method.

The obtained molded product has excellent heat conductivity as compared with conventionally known products, and can be plated by various plating treatment methods. For example, metal salts (sulfates, nitrates, carbonates, chlorides, etc.) of nickel, cobalt, zinc, tin, chromium, copper, palladium, etc. and sodium hypophosphite, sodium hyposulfite, anhydrous sodium sulfite, hydrazine chloride. , Hydroquinone, reducing agents such as formalin and acetic acid, lactic acid, tartaric acid,
A method of immersing a molded product in a plating bath composed of a combination of buffers consisting of alkali salts such as citric acid, succinic acid, malonic acid, adipic acid, and formic acid, and ordinary oxidizing conditioning liquids such as chromic acid mixture After pre-treatment, the product is dipped in a silver nitrate / ammonia water-silver solution and a formalin-reducing solution, and chemical plating such as a method using the silver mirror reaction is performed. There are electroplating treatments for depositing metal, and any of these can be adopted. There is also a method of using both chemical plating treatment and electroplating treatment, and this method is desirable from the standpoint of obtaining plating adhesion and surface smoothness.

〔Example〕

 Hereinafter, the present invention will be described with reference to examples.

Examples 1 to 3 PES3600G manufactured by ICI as an aromatic polysulfone resin,
As the potassium titanate fiber, Tismo D (trade name: K ₂ Ti ₆ O ₁₃ ) manufactured by Otsuka Chemical Co., Ltd., CaCO ₃ as the alkaline earth metal carbonate, and magnesium oxide as the heat transfer property-imparting agent, respectively, and Table 1 After dry-blending with the composition described in 1., pelletized at a cylinder temperature of 320 to 360 ° C. by a single screw extruder having a diameter of 40 mm. Cylinder temperature of the obtained pellets is 360 to 400 ° C by an injection molding machine.
The test piece was molded with and the thermal conductivity was measured as mechanical characteristics and heat transfer characteristics.

Mechanical Properties Tensile Strength ASTM D-638 Flexural Modulus ASTM D-790 Heat Deformation Temperature HDT ASTM D-648 Heat Transfer Characteristics Thermal Conductivity Measured with a thermal conductivity measuring device TXP-400 manufactured by Sankei Engineering (flash method). The above pellets were injection molded into a flat plate of 50 mm × 150 mm × 1 mm, conditioned with the following conditioning liquid, washed with water, and then subjected to chemical plating and electroplating according to a conventional method to obtain a copper plating layer having an average thickness of 27 μm.

Concentrated sulfuric acid: 31 parts by weight Water: 43 〃 Chromium trioxide: 26 〃 The surface smoothness of the obtained plated sample was observed visually and by a surface roughness meter to determine the adhesion strength of the plating according to JIS-C648.
It was measured according to the method described in 1.

Example 4 Udel P-17 manufactured by UCC as an aromatic polysulfone resin
00 (trade name), Tismo D as potassium titanate fiber, CaCO ₃ as alkaline earth metal carbonate, and magnesium oxide as a heat transfer property imparting agent, and the same composition as shown in Table 1 and the same test as Example 1. Did.

Examples 5 to 8 The same tests as in Example 1 were carried out except that the composition of the resin composition was changed as shown in Table 1.

Comparative Example 1 Except that magnesium oxide was not used in the resin composition,
The same test as in Example 8 was performed.

Comparative Example 2 Except that magnesium oxide was not used in the resin composition,
The same test as in Example 4 was performed.

The results are shown in Table 1.

From Table 1, it can be seen that the composition according to the present invention has improved mechanical properties, especially bending elastic modulus and thermal conductivity, as compared with the conventional composition.

[Advantages of the Invention] The composition according to the present invention has been greatly improved in heat transfer characteristics in addition to mechanical characteristics and plating characteristics, and is widely used in electric parts and the like in which heat storage is a problem.

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area C08K 3:22)

Claims (1)

[Claims] 1. A composition comprising 100 parts by weight of an aromatic polysulfone resin, 2 to 60 parts by weight of potassium titanate fiber and 2 to 50 parts by weight of an alkaline earth metal carbonate, and 2 to 90 parts by weight of magnesium oxide. A resin composition for plating having excellent heat transfer characteristics.