JPH073250A - Friction material composition - Google Patents

Abstract

PURPOSE:To obtain a friction material composition, excellent in strength, frictional characteristics, heat and fading resistance and durability and useful as a brake lining by blending cut powder, etc., of a thermosetting resin copper-clad laminated sheet therein. CONSTITUTION:The objective composition is obtained by blending cut powder or pulverized powder of selvedge wastes of a thermosetting resin copper-clad laminated sheet such as a multilayered printed circuit board, etc., therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction material composition using cutting powder of a thermosetting resin copper clad laminate or crushed powder of ear waste.

[0002]

BACKGROUND OF THE INVENTION As friction materials, there are brake linings, disc pads, clutch facings, etc., and they are widely used in automobiles, motorcycles, industrial machines and the like.
These friction materials perform braking or transmission of power by utilizing frictional resistance generated by mechanical contact, and have an important function of converting kinetic energy into heat energy. Conventionally, the main base material of friction materials was asbestos,
In recent years, its carcinogenicity has become a problem and it is being replaced by non-asbestos base materials. As alternative base materials, steel fiber, glass fiber,
Aramid fiber, carbon fiber, etc. are used. The friction material is required to have heat resistance, durability, friction characteristics, fade resistance, etc. as its characteristics, and a phenol resin is mainly used as a binder suitable for it, and in addition to the base material, the binder, barium sulfate, Inorganic substances such as calcium carbonate and clay, and organic substances such as cashew dust and rubber powder are appropriately mixed.
When the amount of binder is increased to increase the binding strength and heat resistance, the coefficient of friction decreases, and in the case of a composition that easily accumulates heat, the temperature tends to rise, and at high temperatures, the amount of decomposed gas generated increases and the fade phenomenon occurs. There is an easy problem.

[0003]

The present inventor has found that this problem can be solved by incorporating a cutting powder of a thermosetting resin copper clad laminate or a crushed powder of selvage into a friction material.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a friction material composition containing a cutting powder of a thermosetting resin copper clad laminate or a crushed powder of ear waste. Such a thermosetting resin copper clad laminate is a synthetic resin such as epoxy resin, phenol resin, polyester resin, melamine resin as a binder, which is applied or impregnated on an organic or inorganic substrate to form a prepreg, which is It is a copper clad laminate obtained by laminating and laminating copper foil on one side or both sides thereof, or a multilayer printed circuit board obtained by processing the circuit into a multilayer to form a multilayer. Then, the cutting powder of the thermosetting resin copper-clad resin laminate or the crushed powder of the selvage thereof is generated when the copper-clad laminate is cut to a fixed size after press molding when producing the copper-clad laminate. The utility value of the contained material is low, and it has been mostly treated as waste.

The present invention utilizes the characteristics of the cutting powder of this thermosetting resin copper clad laminate or the crushed powder of its ear dust, and can effectively utilize resources, and is a bird of one stone. The cutting powder or the crushed powder of the ear waste generated by cutting the thermosetting resin copper-clad laminate is a mixture of copper powder and powder of the thermosetting resin laminate. The mixed powder contains about 5 to 15% of a copper component in the composition, and the other components are thermosetting resin laminated plate components. The shape of copper contained in this mixed powder is 100
Since it is a crushed copper foil having a size of not more than μm, it has a large surface area and good thermal conductivity.

The action of the thermosetting resin powder and the copper powder in the friction material is as follows. Conventionally, a friction material used for a brake lining or the like is obtained by using asbestos as a main base material, mixing a binder such as a phenol resin with an organic or inorganic filler, and hot-pressing. In recent years, the main base material has been changed to other fibers due to the adverse effect of asbestos on the human body, but the compounding agent has played an increasingly important role in improving the friction characteristics and durability of the friction material. An organic filler such as cashew dust is added to the friction material in order to enhance its frictional characteristics, but in that case, the heat resistance is likely to decrease. Since the friction material composition of the present invention contains a resin cured product component containing an organic substance such as cellulose or an inorganic substance such as glass fiber, it has good adhesiveness to a binder such as a phenol resin and enhances heat resistance. You can

Generally, another problem of the friction material is that the friction material accumulates heat during use and its temperature rises, which easily causes a fade phenomenon. The friction material composition of the present invention contains flaky copper powder in addition to the resin component, but this copper powder has a large surface area, and in combination with the good thermal conductivity of copper, the thermal conductivity of the friction material is high. The heat dissipation effect can improve the temperature rise of the friction material and improve the fade resistance.

[0008]

Example The selvage of a paper-based phenolic resin copper-clad laminate was crushed to obtain a powder of 150 μm or less (hereinafter referred to as powder A). Using this, a friction material composition was prepared with the following composition. (Compounding) Glass fiber 50 parts by weight Powdered phenolic resin 18 parts by weight Barium sulfate 10 parts by weight Cashew dust 10 parts by weight Powder A 10 parts by weight The above composition is placed in a mold of 15 thickness x 20 width x 130 length mm and the temperature is 180 After molding for 15 minutes at 200 ° C. and a pressure of 200 kg / cm ² , it was taken out from the mold and fired (180 ° C., 3 hours) to obtain a friction material test piece. The bending strength of this test piece was measured at room temperature and hot (200 ° C), and the friction test (JI
S D 4411).

For comparison, a friction material composition was prepared according to the following formulation without blending powder A. Friction material test pieces were prepared in the same manner as in Examples using this mixture, and the bending strength measurement and the friction test were conducted. (Compounding) Glass fiber 50 parts by weight Powdered phenolic resin 18 parts by weight Barium sulphate 15 parts by weight Cashew dust 15 parts by weight These measurement results are as shown in Table 1, and those of the examples have high bending strength and friction performance. Was good. Further, the brake linings produced in the examples had good fade resistance.

[0010]

[Table 1]

[0011]

EFFECTS OF THE INVENTION The friction material composition of the present invention effectively utilizes the cutting powder or the ear waste of the thermosetting resin copper clad laminate which has been conventionally treated as a waste, and was obtained from the composition. The friction material has high strength and good friction characteristics.

Claims (1)

[Claims] 1. A friction material composition comprising a cutting powder of a thermosetting resin copper clad laminate or a crushed powder of selvage waste.