JPH055092A - Frictional material used in oil - Google Patents

Abstract

PURPOSE:To provide the subject frictional material used in the brakes or clutches of agricultural tractors, building machines, etc., and improved in abrasion resistance under high surface pressure and load conditions. CONSTITUTION:A frictional material contains 20-70wt.% of a rubber composition comprising a hydrogenated nitrile rubber containing finely dispersed zinc polymethacrylate and further contains 0.5-1.5wt.% of a peroxide, 0.5-1.5wt.% of an antioxidant, 5-40wt.% of MT carbon and 20-70wt.% of milled glass fibers. The abrasion of the frictional material is little even under high surface pressure and high load conditions, and the seizing, picking and peeling of the frictional material can be further prevented under the conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material used in oil for automobiles and industrial machines, and particularly, it has excellent wear resistance under high surface pressure and high load conditions.

[0002]

The friction material used in the above oil is used as a wet brake, a wet clutch, a power shift clutch and a PTO clutch in an agricultural tractor, for example. For construction machinery, it is used as wet brakes, transmission clutch plates and wet clutches. The paper material that has been conventionally used as a friction material used in oil has a large compressive deformation when used under high surface pressure, and under the high load condition, so-called burning, squeezing, peeling, etc. occur, and durability There was a problem with sex. That is, the conventional paper material has a low usage limit, and the application of the friction material used in oil is limited to a narrow range.

[0003]

As a result of various studies in view of this, the present invention solves the above-mentioned drawbacks of the paper material by using a rubber having excellent oil resistance and heat resistance and having high strength and high hardness. The developed friction material.

That is, the present invention contains 20 to 70 wt% of rubber in which poly (zinc methacrylate) is finely dispersed in hydrogenated nitrile rubber, further contains 0.5 to 1.5 wt% of peroxide, and 0.5 to 0.5 wt% of antioxidant.
1.5wt%, MT carbon 5-40wt%, milled fiber 2
It is characterized by containing 0 to 70 wt%.

[0005]

Next, an embodiment of the present invention will be described. Rubber with highly finely dispersed poly (zinc methacrylate) in hydrogenated nitrile rubber 40 wt%, peroxide 0.8 wt%, antioxidant
0.6wt%, MT carbon 16.6wt%, milled fiber 40w
t%, white carbon 2wt% and calcium oxide 1wt
%, And the other components were mixed and kneaded into the rubber using a hot roll or Banbury mixer to prepare an intermediate product. This intermediate product is cut into a string shape and put into a hot press mold of a specified shape, at a temperature of 170 ° C and 300 kg / cm ²
Thermoforming was performed for 5 minutes at the surface pressure of. After that, heat treatment was carried out at 150 ° C. for 5 hours to finish to a predetermined thickness, which was bonded to both sides of the iron core and then grooved to obtain a friction material of the present invention.

In the above case, it is more preferable to perform thermoforming, bonding and grooving at the same time using a simultaneous molding die in terms of cost, adhesive strength and dimensional accuracy (variation in thickness). Is.

Table 1 also shows the results of evaluating the characteristics of the friction material of the present invention and the conventional friction material composed of the conventional paper material under the conditions shown in Table 1 with an inertial type wet tester. The test product used was a single plate with friction materials adhered on both sides, and the dimensions were 173φ x 143φ x 6.
2t (mm), conventional product 173φ x 143φ x 4.7t (mm), oil used: TF500, oil temperature 80-120 ° C, and S45C as mating material.

[0008]

[Table 1]

Table 1 shows that the friction material of the present invention has excellent wear resistance and durability under high surface pressure and high load. On the other hand, the conventional friction material has a large amount of wear under more severe conditions, and burns and peeling occur.

[0010]

As described above, according to the present invention, even when the friction material used in oil is used under severe conditions of high surface pressure and high load, the amount of wear is small and there is no burning, rustling or peeling. It has a remarkable effect.

Claims (1)

Claims: 1. A hydrogenated nitrile rubber containing 20 to 70 wt% of a finely dispersed poly (zinc methacrylate) rubber, 0.5 to 1.5 wt% of peroxide, and 0.5 to 1.5 of an antioxidant. wt%, M
A friction material for use in oil, comprising 5 to 40 wt% of T carbon and 20 to 70 wt% of milled fiber.