JPH0356727A - Brake lining containing thermoplastic resin - Google Patents

Abstract

PURPOSE:To prevent bonding strength between lining materials from weakening and improve durability by a method wherein grainy thermoplastic resin having a melting point higher than heating temperature in process of manufacturing lining member is mixed into a lining layer as a lining member. CONSTITUTION:A lining layer 1 contains lining materials such as metal powder, organic filler and inorganic filler, and thermosetting resin as binding agent of the lining materials. The layer 1 blended with grainy heat resistant thermo plastic resin 3 is pre-molded, and after it is mounted on a plate 2 coated with adhesive, it is subjected to heating and compression molding to be bound. The heat resistant thermoplastic resin 3 has a melting point higher than the heating temperature for the above process. On a part of the lining layer 1 which is directly subjected to influence of frictional heat, the heat resistant thermoplastic resin 3 is thermally decomposed together with bonding agent of the lining mate rial. However, the thermoplastic resin 3 can compensate for the fluidized and thermally decomposed bonding agent in the peripheral part so that weakening of bonding power between linings due to the frictional heat can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field in Icheon) The present invention relates to a friction material containing a thermoplastic resin, and more particularly to a friction material containing a thermoplastic resin used for vehicle brakes, etc. <Prior art> As a friction material conventionally used for vehicle drum brakes and disc brakes, linings made of a mixture of lining materials such as metal powder, inorganic fillers, organic fillers, and binders have been used. HQ and G friction materials, in which a layer and a metal plate (hereinafter sometimes referred to as a plate) are bonded together, are commonly used. Such Iff +4 occurs when the surface of the lining layer bonded to the plate comes into contact with the drum or disc of a drum brake or disc brake when the vehicle is being controlled, and at that time the surface of the lining layer bonded to the plate is exposed to a temperature of several 100°C. Instantly 1000℃
Frictional heat generated by nearby objects.

Traditional! ! In friction materials, this kind of frictional heat accumulates within the lining layer, and the friction coefficient of the friction material may drop significantly. Therefore, in order to prevent the accumulation of frictional heat in the lining layer, the inventor of the wood applied the specification (Heikai 1st Year 6 J
In our paper (dated 12/6), we proposed a friction material with granular hardening resin dispersed within the lining layer. (Problems to be Solved by the Invention) According to the friction material containing resin particles described above, the porosity of the lining layer can be improved and the accumulation of frictional heat within the lining layer can be prevented. The decrease in friction coefficient due to
You can stop playing. However, a part of the thermosetting resin blended into the lining layer becomes fluidized during the manufacturing process of Friction +4 and becomes a binding material between the lining materials, so the binding material is thermally decomposed by the frictional heat. It was found that there is a possibility of rapid cracking due to bonding between lining materials. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a friction material that does not weaken the bonding force between lining materials due to frictional heat and eliminates concerns about cracks occurring due to weakening of the bonding force between lining materials. It is in. (Means for Solving the Problem) The present inventor has made repeated studies to achieve the above object.
Fruit, powder and/or ladle-like -{noj5 i1: By placing the Jukukawa-type resin on the bow;
t4' of the lining I, which goes through the first period of γ-ripening: Contains force-it {Hi! We have discovered that this can be avoided, and have developed the present invention. That is, the present invention provides a lining I? as a friction member on the surface of a metal plate. In a friction material in which No. 4 is precipitated, No. 1 is almost uniformly divided and blended into the linen layer.
5) A thermoplastic resin-containing friction material characterized in that the granular and/or granular mature plastic resin has a melting point higher than the temperature applied in the manufacturing process of the friction material. In the friction material of the present invention, as the mature plastic resin,
It is preferable to use a resin containing the following repeating units. (Action) One meter at the same time, J:! The range of the lining layer that is affected by abrasion is limited, and the thermosetting resin compounded in the friction material is thermally decomposed in the area directly affected by frictional heat, but the thermally decomposed resin is Although the thermosetting resin existing at the periphery of the friction material is heated by frictional heat, no particular change is observed because the temperature does not reach the point where it decomposes. Since it has already been hardened by heat treatment during the manufacturing process, the hardening resin at the periphery of the part to be fully decomposed is not easily fluidized even when heated by frictional heat. For this reason, the thermosetting resin in the area that has been thermally decomposed by frictional heat cannot be replenished from the periphery, and the bonding force between the lining materials gradually weakens. In this regard, although the heat-resistant mature plastic resin blended into the lining layer of the friction material of the present invention is thermally decomposed together with the binder of the lining material in the areas directly affected by frictional heat, it is As a result of being able to supplement the fluidized and fully decomposed binder, it is possible to avoid weakening of the bonding force between the lining materials due to frictional heat. (Example) The present invention will be explained in detail using drawings. FIG. 1(a) is a front view of one embodiment of the present invention, and FIG. 1(b) is a front view of an embodiment of the present invention.
A cross-sectional view taken along the A-A plane of a) is shown. In FIG. 1, metal plate 2 (hereinafter, plate 2
(sometimes referred to as
, 4, a part of the lining layer l penetrates, and the lining layer 1 and the plate 2 are firmly bonded. This lining layer 1 contains lining materials such as iron and copper metal powder, organic fillers such as aramid fibers, inorganic compounds such as graphite and antimony oxide, and organic fillers such as barium sulfate, and are mixed uniformly. A mature hardening resin is also included as a bonding agent between these lining materials. A lining material containing such a binder may be formulated with a binder and/or J. ifI
1 type ripening resistance 11 years ■ 1 year. ! 3.3 liters of plastic resin
Ii is included, and its - part is exposed on the surface of Reinink Ij4 1. In the case of tree-length seeds, ripening resistance ripeness τ
As a replastic resin, a resin consisting of the units shown below; so-called polyether ethergate 7 [P
oly Ether Elher Ke [. one
(P E I E K )] is used. The first one like this
The friction material shown in the figure can be produced by the process shown in Figure 2. First, after drilling through holes 4, 4 in the metal plate,
After applying various surface treatments, drying is performed. This surface treatment f
11! The process includes a degreasing process to degrease the plate 2, a shot processing process to increase the adhesive strength between the lining layer 1 and the plate 2 by spraying granules toward the surface of the plate 2, and a process in which the lining layer 1 and the plate 2 are bonded together. This includes an adhesive application process in which a thermosetting adhesive is applied to the two sides of the plate. Apart from such processing steps for the plate 2, the lining material forming the lining layer 1 is mixed, measured, and preformed. The lining materials in this example include iron and copper as metal powders, graphite as inorganic compounds, antimony oxide,
Aramid fiber as organic filler +4, halium sulfate as inorganic filler, powdered phenol resin as binder, and granular and/or powdered PEEK are uniformly mixed and blended. It is preferable that the proportion of PEEK is 3 to 7wt''3?o for the entire lining material.As the phenol resin, novolac-based phenol resin, resol-based phenol resin, etc. can be mentioned.

The thus processed bullet 2 and the pre-shaped lining layer 1 are bonded together by heating and pressing. Such heating and pressure molding can be easily performed using the apparatus shown in FIG. This device is composed of a pressing die 6, an upper die 7, and a lower die 8, and the lower die 8 is provided with a convex portion 5. To perform heating and pressure molding using this device, the plate 2 is set on the lower mold 8 so that the through holes 3 of the plate 2 fit into the convex portions 5 of the lower mold 8. Note that the tip of the four parts 5 should be adjusted so that it is approximately in the middle of the through hole 3. Furthermore, the upper mold 7 is set on the plate 2, and the preformed lining layer 1 is filled into the mold formed by the plate 2 and the upper mold 7. Next, by ripening the lining layer 1 filled with pressure with the press 6, a part of the lining layer 1 enters into the shell holes 4, 4, and the lining layer 1 and the plate 2 are bonded together. At the same time, the phenol resin in the lining layer 1 firmly bonds the lining materials together. The heating temperature during heating and pressure molding is 160 to 170, which is the heating temperature used in conventional friction material molding.
°C can be adopted. In addition, the tz portion 5 of the lower die 8
When heated and pressurized, the packing density of the lining material that crosses the lining 1 of the shell through hole 3'' of the plate 2 is significantly increased. In this example, in order to further perfect the binding of the friction material obtained by heat-pressing molding, 18
After being burned in a hot air oven maintained at about 0 to 230°C for about 9 hours, the Pl rubbing material is made into a product through post-processing steps such as flat polishing and painting to polish the surface of the lining layer 1. In this example, PEEK, the heat-resistant plastic resin compounded in the lining layer 1, has a melting point of approximately 334°C, which is higher than the heat treatment temperature in the manufacturing process of the friction material. Therefore, the shape (powder-like and/or granular) during mixing of raw materials can be maintained to a certain degree, and spots appear on the surface of the lining layer 1. The friction material thus obtained shown in FIG. When I put it in the car and did a driving test,
The friction material of the example had no problems even at the mileage at which cracks occurred in the friction material of the comparative example, and the degree of wear of the friction material of the example was similar to that of the comparison example Pi! It was about 20% less than the rubbing material. In the friction material of the present embodiment described above, a part of the lining layer 1 enters the through holes 4, 4 of the bullet 2, and the lining layer 1 and the plate 2 are bonded together. While the friction material is in use, water leaks from the through holes 4 and 4 into the lining layer 1.
There is a risk that the particles may invade and accumulate in the interior of the lining layer 1 and plate 2, causing rust, etc., and reducing the shear peeling strength between the lining layer 1 and the plate 2. Therefore, as shown in FIG. 4 or FIG. 5(a), the through holes 4, 4 of the plate 2 are substantially blocked with a water-impermeable layer 9, mainly made of water-impermeable resin. This prevents moisture from entering the lining layer 1 through the through holes 4, 4.
It can prevent accumulation and rust. It should be noted that moisture from the surface of the lining layer 1 that comes into contact with the brake drum etc. is easily evaporated by heat such as frictional heat during brake operation and does not accumulate in the lining layer 1. The friction material shown in FIG. 4 is produced in the form of lumps (for example, spherical bodies) made of the same resin as the thermosetting resin as a binder compounded in the lining material in the heating and pressurizing process of the manufacturing process of the friction material. ) in the through hole 4 of the plate 2.
, 4, and then filling the pre-shaped lining layer 1 into a mold formed by the upper mold 7 and the plate 2, followed by heat and pressure molding. Further, by using a hat-shaped molded material 20 shown in FIG. 5(b) in place of the aforementioned lump, the friction material shown in FIG. 5(a) can be obtained. When manufacturing such a friction material, a part of the tip of the convex part of the hat-shaped holder 20 is inserted into the through holes 4, 4 of the plate 2, and heated and pressurized. The lump or cap-shaped molded body 20 that is fitted into the through holes 4 and 4 of the plate 2 to form the water-impermeable layers 9 and 19 shown in FIGS. The through holes 4, 4 of the plate 2 can be easily closed. In the friction material obtained in this way, the lining layer 1 and the plate 2 are firmly bonded together while the through holes 4, 4 of the plate 2 are substantially closed by the water-impermeable layers 9, 19 made of water-impermeable resin. PEEK is bonded to the lining layer 1, and PEEK is dispersed within the lining layer 1. Such a friction material is shown in Figure 1! ? ! Similar to rubbing materials, it can improve the durability of the bonding force between lining materials and reduce f! Concerns about the shear peel strength of the friction material decreasing can also be resolved. In addition, as proposed in the specification previously filed by the present inventor (dated June 26, 1999), particles made of thermosetting resin with a particle size of 0.5 to 3-3 are also available. By blending , the porosity of the lining layer 1 can be increased, and the frictional heat caused by the accumulation of frictional heat within the lining layer 1 can be increased. A
It is possible to prevent phenomena such as a decrease in coefficients. In this example, P is used as the heat-resistant thermoplastic resin.
Although EEK was used, there is no need to specifically limit the resin as long as it is a mature plastic resin that has a melting point higher than the heat treatment temperature in the manufacturing process of the friction material. For example, polyether keto 7 [
Poly Ether Keton (P[i1(
)]q can be used. <Effects of the Invention> According to the friction material of the present invention, it is possible to prevent the binding force between the lining materials from weakening due to frictional heat, so the durability of the friction material can be improved, and the durability of the friction material can be improved. Safe driving can be guaranteed.

[Brief explanation of drawings]

Figure 1 is a front view and cross-sectional view showing a friction material of one embodiment of Mokudan, and Figure 2 is a process diagram explaining the second step of manufacturing the friction material.
Fig. 3 is a cross-sectional view of the apparatus used in the heating and pressurizing process shown in Fig. 2, and Figs. 4 and 5 are cross-sectional views showing other embodiments. In the figure, 1... lining Jj/I, 2... plate, 3...
・・Plastic resin, 4 ・・iJ hole. Fig. l (.) Fig. (b) Fig. 2 Metallic blur 1/Lining layer Fig. Fig. Fig.

Claims (1)

[Scope of Claims] 1. In a friction material in which a lining layer as a friction member is bonded to the surface of a metal plate, powder and/or granules that are substantially uniformly dispersed and blended in the lining layer A friction material containing a thermoplastic resin, wherein the thermoplastic resin has a melting point higher than the temperature applied in the manufacturing process of the friction material. 2. The thermoplastic resin-containing friction material according to claim 1, wherein the thermoplastic resin is a resin consisting of the following repeating units. ▲Contains mathematical formulas, chemical formulas, tables, etc.▼