JPS61281151A - Resin composition having excellent plating characteristic - Google Patents

Abstract

PURPOSE:To obtain a resin composition having excellent heat-resistance and mechanical characteristics and improved plating characteristics, and suitable for the part of electric or electronic apparatus to be plated, by compounding an aromatic polysulfone resin with specific amounts of potassium titanate fiber and an alkaline earth metal carbonate. CONSTITUTION:100pts.wt. of an aromatic polysulfone having the recurring structural unit of formula I, etc., is compounded with (A) 2-60pts., preferably 5-50pts. of potassium titanate fiber of formula II and (B) 2-30pts., preferably 5-20pts. of an alkaline earth metal carbonate [calcium carbonate (CaCO3) and/or calcium magnesium carbonate].

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin composition with excellent plating properties. More specifically, the present invention relates to an aromatic polysulfone resin composition that has excellent heat resistance, mechanical properties, and improved plating properties.

[Conventional technology]

Aromatic polysulfone resin is one of the engineering plastics with excellent mechanical, chemical and thermal properties, and is used in a variety of ways. By the way, when plating aromatic polysulfone resin for use in electrical/electronic, machinery, automobiles, etc., it has usually been used in a composition with calcium carbonate CaCO3 and/or glass fiber.

[Problem that the invention seeks to solve]

However, there is a problem that a composition containing only CaCO3 cannot fully exhibit the mechanical properties of aromatic polysulfone resin, and a composition containing CaCO3 and glass fiber in combination is less effective than a composition containing only CaCO3. Although mechanical properties were improved, there was a problem in that plating properties such as plating adhesion (peel strength) and surface smoothness were insufficient.

An object of the present invention is to provide an aromatic polysulfone resin composition that is excellent in both mechanical properties and plating properties.

[Means for solving problems]

It was discovered that a resin composition free from the above-mentioned problems could be obtained by blending a specific amount of the above into an aromatic polysulfone resin, and the present invention was finally completed.

That is, the present invention contains 100 parts by weight of aromatic polysulfone,
This resin composition has excellent plating properties and is characterized by comprising 2 to 60 parts by weight of an alkaline earth metal carbonate and 2 to 30 parts by weight of potassium titanate fiber.

The aromatic polysulfone resin referred to in the present invention is a linear polymer having an arylene bond (aromatic bond), an ether bond, and a sulfone bond as bonding units in the molecular chain,
For example, polymers having repeating structural units as shown below are known.

Aromatic polysulfone resins can be easily produced by subjecting an alkali ferulate group and an aromatic halogen group activated with an electron-withdrawing sulfone group to a condensation reaction in an aprotic polar solvent (for example, as described in Japanese Patent Publication No. 40-1. Publication No. 0007, Japanese Patent Publication No. 1977-7799, Special Publication No. 47-61
Publication No. 7, etc.). In addition, the above (1) is PE manufactured by ICI.
S (product name), (n) is Udel manufactured by UCC
It is commercially available as (product name).

The potassium titanate fiber used in the present invention has a general formula of 2
It is a ceramic whisker expressed by 0・nTio□ (n is an integer), and is manufactured using K2CO3, KOH, T r 02, etc. as raw materials by firing method, melting method, hydrothermal method, flux method, melt method, etc. (Plastics Vol.
31, A 8 (1980)). A typical example is 2'ri2o, K2T, which has a layered crystal structure.
KzTia with i40g and tunnel-like crystal structure
Examples include O+s, K2Ti6O13, etc.

The amount of potassium titanate fiber used is 2 to 60 parts by weight, preferably 5 to 60 parts by weight, per 100 parts by weight of 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 article will be insufficient. Furthermore, if more than 60 parts by weight is used, the melt fluidity during molding will be significantly reduced.

Examples of the alkaline earth metal carbonates used in the present invention include carbonates of magnesium, calcium, strontium, and barium, preferably calcium carbonate CaCO3
, calcium magnesium carbonate CaMg(CO3)2 is used. The amount used is preferably 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.

It is desirable that the aromatic polysulfone resin, potassium titanate fiber, and alkaline earth metal carbonate are uniformly mixed in the resin composition of the present invention, and the method of addition and mixing is not particularly limited (there are various methods). For example, it is possible to feed each component separately to a melt extruder and mix them, or to mix them in advance using a mixer such as a Henschel mixer, ribbon blender, or tumbler.
Furthermore, it can also be fed to a melt mixer. It is also possible to adopt a method in which the components are dispersed in an aqueous medium or an organic medium and mixed by a wet mixing method.

Various additives such as powder fillers, extenders, stabilizers, coupling agents, glass fibers, etc. may be used in combination as necessary, as long as they do not impede the effects of the present invention.

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

A known method is used for plating the obtained molded product.

For example, metal salts (sulfates, nitrates, carbonates, chlorides, etc.) of nickel, cobalt, zinc, tin, chromium, copper, palladium, etc., sodium hypophosphite, sodium hyposulfite, anhydrous sodium sulfite, and hydrazine chloride. The molded product is immersed in a plating bath composed of a combination of reducing agents such as , hydroquinone, and formalin, and buffering agents consisting of alkali salts such as acetic acid, lactic acid, tartaric acid, citric acid, succinic acid, malonic acid, adipic acid, and formic acid. chemical plating treatment, such as a method that utilizes a silver mirror reaction by pre-treating with a normal oxidizing conditioning solution such as a chromic acid mixture, and then immersing it in a reducing solution consisting of a silver wave consisting of silver nitrate and aqueous ammonia and formalin; There are electroplating treatments in which metal is deposited on the surface of the substrate after cleaning with ultrasonic waves or a weak alkaline detergent, and any of these can be employed. There is also a method of combining chemical plating treatment and electroplating treatment, and this method is desirable from the viewpoint of obtaining plating adhesion and surface smoothness.

〔Example〕

The present invention will be explained below with reference to Examples.

Examples 1 to 3 ICI PE53600 as aromatic polysulfone resin
G, Tismo D (product name, Ni2Ti6013) manufactured by Otsuka Chemical ■ as potassium titanate fiber, and CaCO3 as alkaline earth metal carbonate.
After tri-blending with the composition described in 1, a diameter of 40 m
The pellets were made into pellets using a single-screw extruder at a cylinder temperature of 310 to 350°C. The obtained pellets were molded into test pieces using an injection molding machine at a cylinder temperature of 350 to 390°C.
Mechanical properties were measured.

In addition, the above pellets were added at 50 rr)/fn x 150
After injection molding into a flat plate of 1 (9) size, conditioning with the conditioning solution shown below and washing with water, a copper plating layer with an average thickness of 27 μm was obtained by chemical plating and electroplating according to conventional methods.

(Chromium trioxide: 26 parts by weight) The surface smoothness of the obtained plating sample was observed visually and with a surface roughness meter, and the adhesion strength of the plating was determined according to JIS-C648.
It was measured according to the method described in 1.

The results are shown in Table-1.

As seen in Table 1, the composition of the present invention has excellent mechanical properties and extremely excellent plating properties expressed by surface smoothness and adhesion strength.

Comparative Examples 1-2 The same tests as Examples 1-3 were conducted except that the composition of the resin composition was changed as shown in Table 1. The results are shown in Table-1.

Comparative Example 1 in which glass fiber was used instead of potassium titanate fiber had slightly improved mechanical properties, but was inferior in plating properties such as surface smoothness and adhesion strength. Furthermore, Comparative Example 2, which does not contain any reinforcing material such as potassium titanate fiber or glass fiber, has extremely poor mechanical properties and insufficient plating properties.

Example 4 UdelP- manufactured by UCC as aromatic polysulfone resin
1700 (trade name), Tismo D as the potassium titanate fiber, and CaC01 as the alkaline earth metal carbonate, the same test as in Example 1 was conducted with the composition shown in Table 1. The results are shown in Table-1.

As shown in Table 1, the composition of this example has excellent mechanical properties, surface smoothness, and plating properties expressed by adhesion strength.

Comparative Examples 3 to 4 Test pieces and flat plates were molded in the same manner as in Example 4, except that the composition of the resin composition was changed as shown in Table 1. The test pieces were used to evaluate mechanical properties, and the flat plates were used to measure surface smoothness and adhesion strength after being plated. Table 1 shows the results.
Shown below.

In Comparative Example 3, which includes glass fiber instead of potassium titanate fiber, the mechanical properties are slightly improved, but the plating properties of surface smoothness and adhesion strength are considerably inferior. Also, in Comparative Example 4, which includes the following, although the mechanical properties were slightly improved, the plating properties in terms of surface smoothness and adhesion strength were considerably inferior.

Examples 5 to 7, Comparative Example 5 The same tests as in Example 1 were conducted except that the composition of the resin composition was changed as shown in Table 1. The results are shown in Table-1.

The compositions of these Examples have extremely excellent mechanical properties, surface smoothness, and plating properties expressed by adhesion strength. In addition, in Comparative Example 5 which does not contain alkaline earth metal carbonate,
Although the tensile strength has improved slightly, other mechanical properties, surface smoothness, and adhesion strength of the custom-made plating are considerably inferior.

Comparative example 6.7 PES 3600G as aromatic polysulfone resin.

Tismo D1 is used as the potassium titanate fiber, CaCO3 is used as the alkaline earth metal carbonate, and after tri-blending with the composition shown in Table 1, it is made into pellets using a single screw extruder with a diameter of 40n+ at a cylinder temperature of 330 to 370°C. It was pushed out. Furthermore, this pellet was molded into a test piece using an injection molding machine. The results are shown in Table-1. However, in both cases, the melt fluidity is significantly reduced, so the 50 m7'm x 150 m
A flat plate of m/m x 1 rry'm could not be obtained.

〔Effect of the invention〕

The resin composition of the present invention has excellent mechanical properties and significantly improved plating properties, and can be effectively used in parts of electrical/electronic, machinery, automobiles, etc. that require plating.

Claims (1)

[Scope of Claims] 1. A resin with excellent plating properties characterized by comprising 100 parts by weight of aromatic polysulfone resin, 2 to 60 parts by weight of potassium titanate fiber, and 2 to 30 parts by weight of alkaline earth metal carbonate. Composition 2, alkaline earth metal carbonate is calcium carbonate CaCO
Resin composition 3 according to Claim 1 which is _3, Resin composition 4 according to Claim 1 wherein the alkaline earth metal carbonate is calcium carbonate magnesium CaMg(CO_3)_2, Alkaline earth metal carbonate Similar metal carbonates are CaCO_3 and CaMg
The resin composition according to claim 1, which is a mixture of (CO_3)_2.