JPH0362741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides friction and wear characteristics, tracking resistance,
This invention relates to materials for slide switches with excellent mechanical properties and heat resistance. Conventionally, phenolic resin has been widely used for sliding parts in the electrical field, especially slide switches, etc. due to its excellent electrical and mechanical properties.
This resin has a serious drawback of poor tracking resistance. For this reason, the present inventors considered a polyamide-based material as a material that improves upon such drawbacks.
However, non-reinforced polyamides did not have sufficient mechanical strength and heat resistance. We also considered reinforcing polyamide as an improved material, but found that when these were used, there were often problems with the friction and wear characteristics and tracking resistance, which are essential for slide switch materials. The inventors of the present invention conducted intensive studies to obtain a material that overcomes these drawbacks, and found that a composition of a certain type of inorganic filler and nylon 66 has excellent friction and wear characteristics, tracking resistance, mechanical strength, and heat resistance. The present invention was achieved based on the discovery that That is, the present invention provides an aluminum silicate and/or
Or an inorganic filler that is magnesium silicate.
The present invention relates to a material for a slide switch comprising 10 to 60% by weight of nylon 66 and 40 to 90% by weight of nylon 66. There are many compounds as inorganic fillers commonly used in polyamides. In order to display these inorganic compounds, there are two methods: one method is to show the characteristic elements of the compound components, and the other method is to show the existing forms of these elements. Characteristic elements include magnesium, aluminum, silicon, potassium, calcium, titanium, etc. The existing forms of elements include oxides, carbonates, silicates, and sulfates. The inventors of the present invention have intensively studied a large number of these compounds, and have found that among them, only aluminum silicate and magnesium silicate are suitable as material components for slide switches. That is, it has been found that a composition of aluminum or magnesium silicate and nylon 66 satisfies all of the friction and wear characteristics, tracking resistance, mechanical strength, and heat resistance required as a material for a slide switch. On the other hand, it has been found that all other inorganic fillers lack suitability as material components for slide switches. For example, silicon oxide,
Calcium silicates have poor friction and wear properties (as do glass fibers commonly used as reinforcing agents in polyamides), calcium carbonates have insufficient heat resistance, and potassium titanate has poor tracking resistance. . The magnesium silicate used in the present invention includes talc, sepiolite, enstatite, etc., and talc is particularly preferred. Examples of the aluminum silicate used in the present invention include kaolin, mica, sillamite, and pyrofilite, with kaolin and mica being particularly preferred. The amount of these inorganic fillers added is 10 to 60% by weight. Preferably it is 15 to 50% by weight, more preferably 20 to 40% by weight. If it is less than 10% by weight,
Mechanical properties (tensile strength, compressive strength, etc.) and heat resistance are insufficient. If it exceeds 60% by weight, further improvements in mechanical properties and heat resistance cannot be expected, and the kneading properties during melt-kneading of this inorganic filler and nylon 66 and when molding the nylon 66 composition are Moldability deteriorates significantly. Conventional methods can be used to blend these inorganic fillers into nylon 66, such as dry blending the inorganic filler and nylon 66 granules and melt-kneading them;
There is a method of dry blending the granulated material and directly molding it. In addition, inorganic filler is added to nylon.
When adding to 66, use a coupling agent,
Good dispersion of inorganic fillers is effective for improving friction and wear properties, mechanical properties, and heat resistance. The nylon 66 used in the present invention also includes polyamide copolymers copolymerized within a range that does not impair the properties of nylon 66. The material of the present invention includes nylon 66, carbon fiber, polytetrafluoroethylene, which is generally known as a sliding property improver, in addition to the above-mentioned inorganic filler which is aluminum silicate and/or magnesium silicate. It may contain powder, etc., and may contain glass fiber, wollastonite, etc. as long as it does not adversely affect the friction and wear characteristics.
Silica etc. may be added. In addition, heat stabilizers such as copper compounds, halide salts of alkali metals, phosphorus compounds, flame retardants such as organic halides and antimony compounds, mold release agents such as organic amide compounds and organic ester compounds, higher fatty acids, and their metals. It may also contain lubricants such as salts, colorants such as carbon black, pigments, dyes, etc. The material of the present invention exhibits its effects to the maximum especially in slide switches for automobiles. The slide switch material of the present invention has excellent friction and wear characteristics and tracking resistance, and has sufficiently high mechanical properties and heat resistance. Hereinafter, the present invention will be explained in more detail with reference to Examples. In addition, measurements of friction and wear characteristics, tracking resistance, tensile strength, compressive strength, and heat distortion temperature in Examples were performed as follows. Friction and wear characteristics: A test piece and a mating material (copper) were slid under the following conditions, and the difference in weight between the mating material before and after sliding was measured. Testing machine: Toyo Baldwin Friction and Wear Testing Machine
EFM--Type B (The contact state between the test piece and the mating material is shown in the drawing.) Measurement conditions: Comparing material: Copper Surface pressure: 10Kg/cm ² ; Sliding linear speed: 5cm/sec Sliding time: 4Hr Tracking resistance Gender: According to DIN-KA method. Tensile strength: According to ASTM-D-638. Compressive strength: According to ASTM-D-695. Heat distortion temperature: According to ASTM-D-648. Example 1 Nylon 66 (Leona #1300 manufactured by Asahi Kasei Corporation) 80
The mixture was mixed with 20% by weight of talc (CRS6002 manufactured by Ryumori Co., Ltd.) and melted, kneaded, and granulated using a 70 mmφ single-screw extruder manufactured by Ishinaka Tekko Co., Ltd. Nylon 66 composition pellets were obtained. This was molded using an injection molding machine, and its friction and wear characteristics, tracking resistance, tensile strength, compressive strength, and heat distortion temperature were measured. The measurement results are shown in Table 1. Examples 2 to 4 An experiment similar to Example 1 was conducted using 40% by weight of talc (Example 2), 20% by weight of kaolin (ASP-200 manufactured by Hayashi Kasei Co., Ltd.) (Example 3), and mica (Shiraishi Kogyo Co., Ltd.). )325M)
20% by weight (Example 4). However, in Examples 2 to 4, the filler was treated with a silane coupling agent. The results are shown in Table 1. Comparative Example 1 A tracking resistance test was conducted on a phenolic resin. The results are shown in Table 1. Comparative Example 2 67% by weight of nylon 66 and 33% by weight of glass fiber were kneaded and extruded, molded, and measured for friction and wear characteristics, tracking resistance, tensile strength, compressive strength, and heat distortion temperature. The results are shown in Table 1. Comparative Example 3 80% by weight of nylon 66 and 20% by weight of potassium titanate (Teismo Type D manufactured by Otsuka Chemical Co., Ltd.) were melt-kneaded and granulated, molded and the tracking resistance was measured. The results are shown in Table 1. Comparative Example 4 The tensile strength, compressive strength, and heat distortion temperature of nylon 66 were measured. The results are shown in Table 1. From the results in Table 1, it can be seen that phenolic resin has poor tracking resistance, that nylon 66 mixed with glass fiber has improved tracking resistance but has poor friction and wear properties, and that nylon 66 has poor tracking resistance.
It can be seen that the tracking resistance of 66 mixed with potassium titanate is not sufficient. On the other hand, the material of the present invention has friction and wear properties, tracking resistance,
It can be seen that both mechanical properties and heat resistance are excellent. 【table】

[Brief explanation of drawings]

The drawing is a front view showing the state of contact between a test piece and a mating material when measuring friction and wear characteristics. In the figure, 1 indicates a test piece (to be fixed), 2 indicates a mating material (copper), and 3 indicates a sliding surface between the test specimen 1 and the mating material 2.

Claims (1)

[Claims] 1. 10 to 60% by weight of an inorganic filler that is an aluminum silicate and/or a magnesium silicate.
A slide switch material consisting of nylon 66 and 40 to 90% by weight. 2 Aluminum silicate is kaolin, mica,
The material for a slide switch according to claim 1, wherein the magnesium silicate is talc.