JPS6322856A - Polyetherimide resin composition - Google Patents

Abstract

PURPOSE:To obtain the titled composition significantly improved in mechanical properties, heat resistance and dimensional stability, capable of giving engineering parts of both high functionality and precision, by blending polyetherimide with ceramic fiber. CONSTITUTION:The objective composition can be obtained by homogeneously blending, in a blender, (A) 30-99wt% of polyetherimide and (B) 70-1wt% of ceramic fiber [alumina (Al2O3) - silica (SiO2) - based glass fiber].

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a polyetherimide resin composition with improved mechanical properties, heat resistance, and dimensional stability.

(Prior Art) Polyetherimide is one of the engineering plastics with excellent mechanical, chemical, and heat resistance, and is used in various applications such as electrical and electronic equipment, machinery, and automobiles. However, with recent technological advances, there has been a demand for polyetherimide with even higher properties.

For this reason, methods have been implemented to improve mechanical strength, heat resistance, etc. by blending fibrous reinforcing agents such as glass fibers, carbon fibers, and aramid fibers with polyetherimide. However, when fibrous reinforcing agents are blended, there are problems such as abrasion of molding machines and molds due to large anisotropy and poor surface smoothness. Flake-like calcium carbonate, etc.
Although it is possible to improve the dimensional stability of a molded article by adding a spherical or powdered filler, it has the disadvantage that the molded article becomes brittle.

(Problems to be Solved by the Invention) - An object of the present invention is to provide a polyetherimide resin composition with improved mechanical properties, thermal properties, and dimensional stability.

(Means for solving the problem) As a result of various studies conducted by the present inventors to achieve the above object,
The present inventors have discovered that a composition consisting of polyetherimide and ceramic fibers is effective, and have completed the present invention.

That is, the present invention uses polyetherimide 30 to 99 w tχ
and ceramic fibers 70 to 111Lχ.

The polyetherimide used in the present invention is a general term for polymers that have both ether bonds and imide bonds in their structure, and is generally manufactured by General Electric Co., Ltd., which has a structure represented by formula (1). The product name Ultem manufactured by the company is widely known, for example, JP-A-56-82
It can be easily produced by the method described in Publication No. 6.

This polymer is attracting attention as a non-grade thermoplastic engineering plastic with excellent heat resistance, chemical resistance, III flammability, electrical properties, and moldability, and is used in fields such as electrical and electronic parts, automobile parts, and mechanical parts. It is expected that it will be widely used.

The ceramic fiber used in the present invention is alumina (A
l□03) - Silica (Si(h)-based glass fiber, which is a blowing method in which raw materials mainly composed of alumina and silica are melted and blown using a high-speed stream of steam or air, and a centrifugal method using a rotating disk. Typical examples include a standard type in which the ceramic fiber raw material composition weight ratio (Ah (h; SiO , 60%:40% high temperature type, 95%:5% ultra high temperature type, etc.

The appropriate blending ratio of ceramic fiber and polyetherimide is 30-99@tX of polyetherimide and 70-1@t% of ceramic fiber, based on the total amount of polyetherimide and ceramic fiber. When polyetherimide exceeds 99wtχ and ceramic fiber is less than 1wtχ, the desired mechanical properties,
Improvements in thermal properties and dimensional stability are insufficient, and if the polyetherimide content is less than 30wt2 and the ceramic fiber content exceeds towtz, the melt flowability is significantly reduced.

In the resin composition according to the present invention, it is desirable that the polyetherimide and the ceramic fiber are uniformly mixed, and the mixing method is not particularly limited, and various means can be adopted.For example, each may be melt-extruded separately. They can be mixed by being fed into a machine, or they can be premixed in advance using a mixer such as a Henschel mixer, ribbon blender, or tumbler, and then 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 using a wet mixing method.

Powder fillers, extenders, stabilizers, campling agents, glass fibers, and other additives may be used as necessary, as long as they do not impede the effects of the present invention.
Various ceramics such as aluminum oxide, titanium oxide, silicon carbide, and other thermoplastic resins (e.g. polyamide, polycarbonate, polyphenylene sulfide, PET)
, Pa↑, polyacetal, polyethersulfone, polyetherketone, etc.), thermosetting resins (e.g., phenol resin, epoxy resin, silicone resin, polyimide resin, polyamideimide resin, etc.) may be used in combination. The resin composition of the invention 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.

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

Examples 1 to 4 After tri-blending Ultem 1000 (trade name, manufactured by General Electric Company, USA) as a polyetherimide and Ibiwool CP-U (trade name) manufactured by IBIDEN ■ as a ceramic fiber, each with the composition shown in Table 1. , a cylinder temperature of 330~ by an extruder with a diameter of 401
Pelletized at 370°C.

The obtained pellet is heated to a cylinder temperature of 3 using an injection molding machine.
A test piece was molded at 70 to 410°C, and its mechanical properties and thermal properties were measured.

Here, tensile strength, bending strength, and HDT are each AST
? ID-638,! 1-790 and D-648.

In addition, the above bellet is 75auw x 75m x 2
1111 was injection molded into a flat plate, and the molding shrinkage rate was measured.

Here, the flow direction of the melt is MO (Machine D
direction), and the right angle direction is TD (Transv direction).
direction).

The results are shown in Table-1.

As seen in Table 1, the resin composition of the present invention has excellent mechanical properties and thermal properties, low mold shrinkage and anisotropy, and extremely excellent dimensional stability.

Comparative Examples 1 to 3 Except for changing the composition of the resin composition as shown in Table 1,
Tests similar to Examples 1 to 4 were conducted. The results are shown in Table-1.

Comparative Example 1, which does not contain any ceramic fibers, has insufficient mechanical properties and thermal properties, and has a high molding shrinkage rate, and Comparative Example 2, which contains a large amount of ceramic fibers, has
It was not possible to obtain a molded article because the melt fluidity was significantly reduced.

Comparative Example 3, in which glass fiber was used instead of ceramic fiber, had improved mechanical properties, thermal properties, and molding shrinkage rate, but had large anisotropy in the MD/T mouth direction and poor dimensional stability. It has become.

(Effects of the Invention) The resin composition according to the present invention has significantly improved mechanical properties, thermal properties, and dimensional stability, and is widely used in various engineering parts that require high livestock performance and high precision.

Claims (1)

[Claims] A polyetherimide resin composition comprising 30 to 99 wt% of polyetherimide and 70 to 1 wt% of ceramic fibers.