KR100709041B1 - Adhesive composition for brake pad and brake pad-back plate combined body manufactured by using the same - Google Patents

Abstract

The brake pad-back plate combination includes a back plate, a porous layer, a primer layer, an adhesive layer and a brake pad. The porous layer includes a salted film or a nitrided film formed on the backplate. The primer layer is formed on the back plate and includes a phenol resin and a silane compound having a weight average molecular weight of 1000 to 2500. The adhesive layer is formed on the primer layer and includes a phenol resin and a silane compound having a weight average molecular weight of 1000 to 2500. The brake pad is adhered on the adhesive layer. The adhesion of the brake pad and the back plate is very excellent and the efficiency of the bonding process can be improved.

Description

Brake pad adhesive composition and a brake pad-back plate assembly manufactured using the same The present invention relates to a brake pad adhesive composition and a brake pad-back plate assembly manufactured using the same.

 1 is a perspective view illustrating a brake pad-back plate assembly according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the brake pad-backplate taken along the line I ₁ -I ₂ of FIG. 1. FIG.

3 is a conceptual diagram illustrating a process of applying a primer composition on a back plate.

* Description of the symbols for the main parts of the drawings *

100: back plate 150: adhesive layer

152: porous layer 154: primer layer

156: adhesive layer 200: brake pad

The present invention relates to a brake pad adhesive composition and a brake pad-back plate assembly prepared using the brake pad adhesive composition. More specifically, the brake pad-back has excellent bonding stability, which is manufactured by using the brake pad adhesive composition and the brake pad adhesive composition which can improve the adhesive performance due to excellent permeability and prevent peeling of the brake pad. It relates to a plate assembly.

In general, the brake is a braking device that is installed on the wheel of the vehicle and serves to control the progress of the vehicle. The brake is divided into a drum-type brake for braking by contacting the friction pad to the cylindrical drum and a disk-type brake for braking by contacting the friction pad to the disk.

The disc brake includes a brake pad to which a friction material is attached to a disc of a disc that rotates integrally with the wheel. Brake pads that perform a substantially braking function are generally bonded to the backplate. The brake pad generates braking force by converting kinetic energy of the rotating wheel into thermal energy when pressure is applied from the outside.

Since the adhesive properties of the disk pad and the back plate have a decisive influence on the mechanical performance of the brake, in the brake, the adhesive layer formed between the disk pad and the back plate is a very important functional factor.

Conventionally, in order to improve the adhesive performance between the brake pad and the back plate, simply rely on the performance of the adhesive, or attempt to improve the adhesive performance by performing a short treatment on the back plate surface. The short treatment can increase the surface area of the back plate, thereby improving the bonding strength of the back plate and the adhesive.

However, in spite of the improvement of the adhesive performance as described above, in the process of converting the kinetic energy into thermal energy by the rotation of the wheel, a strong shear force is applied in the rotational direction, so that the adhesive layer is deteriorated, and the moisture is impregnated with the back plate. Rust is generated between the brake pads, which may cause peeling of the brake pads from the back plate, which still causes deterioration of the safety of the vehicle.

The present invention provides a composition for bonding a brake pad having excellent permeability and excellent adhesion.

The present invention also provides a brake pad-back plate assembly prepared by using the composition for adhering the brake pad and having excellent bonding strength between the brake pad and the back plate, thereby reducing the risk of peeling.

Brake pad adhesive composition according to an aspect of the present invention has a weight average molecular weight of 1000 to 2500 phenol resin 25 to 35% by weight, silane compound 1 to 2% by weight, foam inhibitor 0.2 to 0.8% by weight and solvent 62 to 72 Contains weight percent. Preferably, the pad bonding composition is used when salted or nitrided on the back plate adhered to the brake pad, and more preferably applied on the phosphate treated back plate.

The brake pad-back plate assembly according to one aspect of the present invention includes a back plate, a porous layer, a primer layer, an adhesive layer and a brake pad. The porous layer includes a salted film or a nitrided film formed on the back plate. The primer layer is formed on the back plate and includes a phenol resin and a silane compound having a weight average molecular weight of 1000 to 2500. The adhesive layer is formed on the primer layer and includes a phenol resin and a silane compound having a weight average molecular weight of 1000 to 2500. The brake pad is adhered on the adhesive layer.

The brake pad adhesive composition is excellent in permeability and adhesion, and in particular, excellent in penetrating power into a salted or nitrided film. In addition, the brake pad-back plate is excellent in the bonding force between the brake pad and the back plate can reduce the risk of peeling. In addition, according to the present invention, it is possible to increase the efficiency of the bonding process of the brake pad and the back plate.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

1 is a perspective view illustrating a brake pad-back plate assembly according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the brake pad-backplate taken along the line I ₁ -I ₂ of FIG. 1. FIG.

1 and 2, the brake pad-back plate assembly 500 includes a back plate 100, a brake pad 200, and an adhesive layer 150 formed between the back plate 100 and the brake pad 200. It includes.

The adhesive layer 150 may include a multi-porous layer 152, a primer layer 154, and an adhesive layer 156.

The porous layer 152 includes a salt treatment membrane or a nitride treatment membrane. The salt treatment membrane or nitride treatment membrane phosphate the surface of the back plate 100 Or by nitriding. The chloride film is preferably formed by phosphate treatment.

The multi-porous layer 152 may block rust generation and suppress peeling of the brake pad 200 due to deterioration of the primer layer 154 or the adhesive layer 156.

The primer layer 154 is formed by applying and curing a primer composition on the multi-porous layer 152. The primer layer 154 may be formed by applying the primer composition once, but is preferably formed through a plurality of divided coating processes.

3 is a conceptual diagram illustrating a process of applying a primer composition on a back plate.

Referring to FIG. 3, the primer composition 20 is applied while the back plate 100 is disposed on the support member 10 and moved to the right side according to the movement of the conveyor belt 700. The primer composition is sprayed through the spray nozzle 650 of the spraying device 600 is applied on the back plate 100. Since the injection device 600 includes a plurality of injection nozzles 650, the primer composition may be divided and applied several times within a short time on the back play 100. Thus, the primer composition 20 may be uniformly applied on the backplate.

As such, when the primer layer 154 is formed to have a uniform surface, the back plate 100 may be stably protected from external oxidation factors. The primer layer 154 simultaneously serves as a protective film and an adhesive layer.

In addition, the applied primer composition is dried for 20 to 30 minutes at a temperature of 180 to 220 ℃. When the drying process is completed, a hardened coating film is formed, which may function as a kind of coating film, thereby preventing oxidation of the back plate and blocking inflow of external moisture.

Hereinafter, the primer composition will be described in more detail.

Primer composition

The primer composition comprises 25 to 35% by weight of phenol resin, 1 to 2% by weight of the silane compound, 0.2 to 0.8% by weight of the foam inhibitor and 62 to 72% by weight of the solvent.

As the phenol resin, an unmodified phenol resin is used. When the weight average molecular weight of the phenol resin is less than 1000, a thin film may be formed due to low molecular weight, thereby causing peeling of the film. On the other hand, if it exceeds 2500, the penetration force into the porous layer 152 is significantly reduced, thereby greatly reducing the adhesive performance. Preferably, the weight average molecular weight of the phenol resin is 1400 to 2000.

As the silane compound, aminosilane, epoxy silane and the like can be used. The compounds may be used alone or in combination of two or more. The silane compound may enhance surface strength.

As the bubble inhibitor, any one of a silicon-based material and a non-silicon-based material may be used, but a silicon-based compound is preferably used. As the silicone compound, a polysiloxane solution, a polysiloxane non-aqueous emulsion, or the like may be used, and the materials may be used alone or in combination of two or more. As the bubble inhibitor, a single bubble inhibitor may be used, or two or more bubble inhibitors may be mixed and used. The bubble inhibitor may suppress the generation of bubbles on the surface of the back plate to prevent a drop in strength due to bubbles, and further improve the bonding force between the back plate and the brake pad.

As the solvent, a general organic solvent may be used. Preferably, a mixed solvent containing ethyl alcohol and isopropyl alcohol in a weight ratio of 1: 2.5 to 3 is used.

Hereinafter, the primer composition will be described in detail through specific examples. However, the technical spirit of the present invention is not limited by the following examples.

Examples 1 and 2

To prepare the primer compositions of Examples 1 and 2 by mixing and stirring each component according to the composition of Table 1 below.

Comparative Example 1

To prepare a primer composition of Comparative Example 1 by stirring each component according to the composition of Table 1.

TABLE 1

Phenolic Resin (unmodified) (wt%) Silane compound Bubble inhibitor solvent Weight average molecular weight (Mw) Number average molecular weight (Mn) Aminosilane (% by weight) Epoxysilane (wt%) Siloxane solution Polysiloxane Non-aqueous Emulsion Ethyl alcohol (wt%) Isopropyl Alcohol (wt%) Methyl Alcohol (wt%) Example 1 28.1 0.8 - 0.1 - 21.3 49.7 - 1532 476 Example 2 27.0 - 0.8 - 0.1 21.63 50.47 - 2080 472 Comparative Example 1 27.9 - - - - - 63.937 2.163 3715 686

General property measurement

About the primer compositions according to Examples 1 and 2 and Comparative Example 1, the general physical properties of the non-volatile content (%), viscosity (#G), pH and curing time (130 ℃) was measured to compare the evaluation results 2 is shown.

TABLE 2

Nonvolatile matter (% by weight) Viscosity (#G) pH Curing time (130 ℃) Example 1 28.1 A3-A2 8.3 12 minute, 30 seconds Example 2 27.0 A5-A4 7.9 9 minute, 40 seconds Comparative Example 1 27.9 A3-A2 8.3 9 minute, 30 seconds

Room temperature shear strength, heat resistance and adhesion

Shear strength at room temperature was evaluated using the KS R 1104 test method, and heat resistance was evaluated by using the KS R 1104 test method after drying for 6 hours at 350 ° C. The results are shown in Table 3 below.

TABLE 3

Room temperature shear strength evaluation (shear strength / exposure) Heat resistance evaluation (shear strength / exposure) Adhesive force evaluation (Kgf / ㎠) Example 1 60kgf / ㎠, 3.2% 36.9kgf / ㎠, 1.5% 14.91 Example 2 59.9kgf / ㎠, 2.2% 38.1kgf / ㎠, 7.5% 13.82 Comparative Example 1 61.9kgf / ㎠, 11.2% 35.5kgf / ㎠, 10.5% 12.52

Corrosion Resistance Evaluation

Corrosion resistance was evaluated using the JIS D 4419 test method. The rust incidence area was measured after 30, 60 and 90 days, respectively. The results are shown in Table 4 below.

TABLE 4

Rust area after 30 days Rust area after 60 days (%) Rust area after 90 days Example 1 0.9% 4.1% 7.0% Example 2 0.9% 5.7% 16.0% Comparative Example 1 1.4% 11.9% 18.0%

As seen above, the bonding compositions of Examples 1 and 2 according to the present invention were found to be very superior to the composition according to Comparative Example 1, which is a conventional bonding composition, in terms of shear strength, heat resistance and adhesion. In particular, it can be seen that the adhesive composition according to Examples 1 and 2 includes a silane-based compound and a bubble suppressant, and thus, the adhesive composition is superior to the adhesive composition according to Comparative Example 1 which does not include the same. In addition, compared to Comparative Example 1, the rust generation area is relatively very small, which is expected to be able to effectively suppress the decrease in adhesion due to rust generation.

When the primer layer 154 is formed by the primer composition as described above, the adhesive composition is coated on the primer layer 154 and dried to form an adhesive layer 156. The adhesive composition is the same as the primer composition, so further description thereof will be omitted.

Unlike the primer composition, the adhesive composition does not have to undergo a plurality of divided coating processes.

Finally, the brake pad 200 is adhered to the adhesive layer 156.

For the adhesion of the brake pad 200, the adhesive composition is dried for 8 to 12 minutes at a temperature of 80 to 100 ℃. Unlike the drying process of the primer composition, the adhesive composition may be dried for a relatively low temperature and for a short time, thereby excluding the protective film function performed by the primer layer and performing an adhesive function intact.

As described above, the brake pad-back plate assembly 500 includes a back plate 100, a multi-porous layer 152, a primer layer 154, an adhesive layer 156, and a brake pad 200. The primer layer 154 and the adhesive layer 156 include a phenol resin and a silane compound having a weight average molecular weight of 1000 to 2500.

As described above, the primer composition includes a high purity and low molecular weight phenolic resin so that it can easily penetrate into the porous layer formed on the back plate, thereby preventing the brake pad from being peeled from the back plate. can do.

In addition, since the multi-porous layer is formed on the back plate, it is possible to prevent damage due to oxidation of the back plate and degradation of the primer layer and the adhesive layer.

In addition, by introducing a primer layer of the same component as the adhesive layer without employing a separate coating component, it has a rust preventing effect without causing a decrease in adhesive force.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated.

Claims (8)

25 to 35% by weight of phenol resin having a weight average molecular weight of 1000 to 2500; 0.8 to 2 wt% silane compound; Foam inhibitor 0.1 to 0.8 wt%; Brake pad adhesive composition comprising 63 to 73% by weight of a solvent. The composition of claim 1, wherein the silane compound comprises at least one compound selected from the group consisting of aminosilane and epoxysilane. The composition of claim 1, wherein the bubble inhibitor comprises a silicone-based material. The composition of claim 3, wherein the silicon-based material comprises at least one material selected from the group consisting of a polysiloxane solution and a polysiloxane non-aqueous emulsion. The brake pad adhesive composition of claim 1, wherein the solvent comprises ethyl alcohol and isopropyl alcohol in a weight ratio of 1: 2.5 to 3. Backplates; A porous layer including a salted film or a nitrided film formed on the back plate; A primer layer formed on the back plate and including a phenol resin and a silane compound having a weight average molecular weight of 1000 to 2500; An adhesive layer formed on the primer layer and comprising a phenol resin and a silane compound having a weight average molecular weight of 1000 to 2500; And A brake pad-back plate assembly comprising a brake pad adhered on the adhesive layer. 7. The brake pad and backplate combination of claim 6, wherein the salted membrane is formed by phosphate treatment. The method of claim 6, wherein the primer layer and the adhesive layer is formed using a primer composition and a bonding composition, respectively, characterized in that each of the solvent containing ethyl alcohol and isopropyl alcohol in a weight ratio of 1: 2.5-3. Brake pads and back plate assembly.

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