CN114733736A - Production process of brake pad containing copper-free NAO friction material - Google Patents
Production process of brake pad containing copper-free NAO friction material Download PDFInfo
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- CN114733736A CN114733736A CN202210456680.2A CN202210456680A CN114733736A CN 114733736 A CN114733736 A CN 114733736A CN 202210456680 A CN202210456680 A CN 202210456680A CN 114733736 A CN114733736 A CN 114733736A
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- Prior art keywords
- brake pad
- friction material
- production process
- copper
- conductive paste
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Braking Arrangements (AREA)
Abstract
The invention belongs to the field of friction brake materials, and discloses a production process of a brake pad containing a copper-free NAO friction material. The production process comprises the following steps: (1) coating conductive paste in a mould, then placing the copper-free NAO friction material and the steel backing in the mould for pressing, and demoulding to obtain a brake pad blank; (2) and curing and electrostatic spraying are carried out on the brake pad blank to obtain the brake pad. The production process uses the functional coating conductive paste to ensure that the side surface of the brake pad containing the copper-free NAO friction material can also realize good electrostatic spraying effect, thereby forming a smooth and bright coating film.
Description
Technical Field
The invention belongs to the field of friction brake materials, and particularly relates to a production process of a brake pad containing a copper-free NAO friction material.
Background
With the continuous development of the social industry, the requirements of people on brake pads of transportation means such as airplanes, automobiles, trains and the like are gradually improved, so that safer and environment-friendly materials are produced at the same time. Asbestos is used as an early friction material, but a large amount of dust is generated under the condition of friction of asbestos, so that the friction material causes great harm and pollution to human bodies and the environment, and the performance of the prepared friction material is insufficient. Through continuous research and improvement, the addition of copper fibers into NAO (asbestos-free organic) friction materials is found to effectively improve the performance of the friction materials. However, during the last decade of environmental monitoring, copper-free NAO friction materials have been the focus of research and development of friction materials, because during production and use loss, copper powder dust is generated in large quantities to enter air, and deposit in rivers and gulf, causing heavy metal pollution of atmosphere and water.
However, when the brake pad is produced and manufactured by using the copper-free NAO friction material, uniform electrostatic spraying is difficult to realize on the side surface of the brake pad, and a complete and uniform paint film cannot be formed. However, since the side paint film of the brake pad only relates to the decoration and rust prevention effects and has no influence on the actual friction performance of the prepared brake pad, people in the industry neglect the problem for a long time and do not provide a corresponding solution.
The invention aims to provide a corresponding solution to the technical problem.
Disclosure of Invention
The present invention has been made to solve at least one of the above-mentioned problems occurring in the prior art. Therefore, the invention provides a production process of a brake pad containing a copper-free NAO friction material. The production process uses the functional coating conductive paste to ensure that the side surface of the brake pad containing the copper-free NAO friction material can also realize good electrostatic spraying effect, thereby forming a flat and bright coating film.
The invention provides a production process of a brake pad containing a copper-free NAO friction material, which comprises the following steps:
(1) coating conductive paste in a mould, then placing the copper-free NAO friction material and a back plate in the mould for pressing, and demoulding to obtain a brake pad blank;
(2) and curing and electrostatic spraying are carried out on the brake pad blank to obtain the brake pad.
After research, the invention discovers that when the copper-free NAO friction material is used for producing the brake pad, the copper-free NAO friction material does not contain metal materials with excellent conductivity, such as copper fibers, iron fibers and the like, so that the effective adhesion of the coating on the side surface of the friction material can not be realized in the step of electrostatic spraying, and finally the formed paint film is incomplete. Although the back plate contains conductive metal iron, the back plate is limited by the shape of the brake sheet product, and if the friction material lacks an electrostatic adsorption function, the side area of the back plate near the friction material cannot be subjected to good electrostatic spraying. Therefore, the invention thinks that the side surface of the brake sheet blank can form a conductive thin layer by coating the conductive paste containing the conductive material on the side surface in the mould and then placing the copper-free NAO friction material and the back plate in the mould for pressing, so as to ensure the good electrostatic spraying effect of the brake sheet product, thereby forming a smooth and bright permanent coating film which plays the roles of decoration and rust prevention.
Wherein the copper-free NAO friction material generally comprises the following components: resin, non-metallic mineral fiber (main components including silica, alumina, magnesia, etc.), abrasive, lubricant and filler.
Preferably, the conductive paste in the step (1) comprises the following components: graphite, phenolic resin and water glass.
More preferably, the conductive paste comprises the following components in parts by weight: 60-90 parts of graphite, 2-10 parts of phenolic resin and 2-12 parts of water glass.
Preferably, the method of coating in step (1) is brush coating.
Preferably, the pressing method in step (1) is hot pressing.
Preferably, the step (1) is to spray a release agent in the mold before applying the conductive paste. Spraying a release agent may facilitate subsequent release operations.
Preferably, the method of curing in step (2) is heat treatment.
Preferably, step (2) further comprises an operation of grinding the cured brake pad. The grinding treatment can improve the surface smoothness of the product and remove flash and burr.
The invention also provides a brake pad containing the copper-free NAO friction material, which is prepared by the production process.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with the manufacturing process of the brake pad containing the copper-free NAO friction material, the manufacturing process only adds the step of coating the conductive paste, so that the technical route is changed slightly, and the manufacturing process has good practicability and applicability in actual production.
(2) The conductive paste belongs to functional coatings, and through the operation of coating the conductive paste, the copper-free NAO friction material and the side surface of the back plate can form a flat and bright coating film after electrostatic spraying operation, so that good decoration and rust prevention effects are achieved.
Drawings
FIG. 1 shows the backing plate (steel backing) and friction material side in place in the brake pad;
FIG. 2 is a graph showing the electrostatic spraying effect of the lateral surface of the brake pad obtained in example 1;
FIG. 3 shows the electrostatic spraying effect of the side surface of the brake pad prepared in comparative example 1.
Detailed Description
In order to make the technical solutions of the present invention more clearly apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are only preferred embodiments of the present invention, and the claimed protection scope is not limited thereto, and any modification, substitution, combination made without departing from the spirit and principle of the present invention are included in the protection scope of the present invention.
The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.
Example 1
The embodiment provides a brake pad containing copper-free NAO friction material, and the production process comprises the following steps:
1. and spraying a conventional release agent in the production mold.
2. Brushing a functional coating-conductive paste on the inner side surface of a production mold by using a brush, wherein the conductive paste comprises the following components in parts by weight: 85 parts of graphite, 5 parts of phenolic resin and 10 parts of water glass.
2. Putting raw materials (comprising 5 parts by weight of epoxy resin, 25 parts by weight of non-metallic mineral fiber (silicon dioxide, aluminum oxide and magnesium oxide), 20 parts by weight of grinding materials (such as zirconium oxide and silicon carbide), 10 parts by weight of lubricating agents (such as antimony sulfide and tin sulfide) and 40 parts by weight of fillers (such as friction powder, barium sulfate, calcium carbonate, calcium silicate and mica) for preparing the copper-free NAO friction material into a mixer for mixing to obtain a mixture; coating steel back (namely a back plate) with steel back glue;
3. filling the mixture into a production mold, putting the glued steel backing, and performing hot-pressing; and demolding to obtain the brake pad blank. Wherein the parameter range of the hot pressing process is as follows: hot pressing pressure 200kg/cm2-500kg/cm3The temperature of the mold frame is 140 +/-5 ℃, the temperature of the mold core is 140 +/-5 ℃, the temperature of the upper mold is 150 +/-5 ℃, the exhaust frequency is 3-8 times, the exhaust height is 0.1-3mm, and the pressure maintaining time is 150 plus or minus 300 s.
4. Sintering and curing the prepared brake disc blank, wherein the curing process comprises the following steps: heating from 30 ℃ to 180 ℃ at a heating rate of 50 ℃/h; keeping the temperature at 180 ℃ for 2 h; heating from 180 ℃ to 230 ℃ at a heating rate of 50 ℃/h; keeping the temperature at 230 ℃ for 5 h; and (5) naturally cooling.
5. And carrying out grinding treatment on the solidified brake block so as to improve the surface smoothness of the product and remove flash and burr.
6. And spraying the side surface of the brake block by adopting an electrostatic spraying process to finish the manufacture of the brake block. Wherein, the parameter range of electrostatic spraying is as follows: the spraying pressure is 0.05-0.15MPa, the distance between the spray gun and the spray gun is 400mm, the speed of the conveying chain is 2-5m/min, and the temperature is 180 +/-5 ℃.
Comparative example 1
This comparative example provides a brake pad containing a copper-free NAO friction material produced by a process substantially the same as example 1 except that: does not contain a step of applying the conductive paste to the inner side of the production mold.
Product effectiveness testing
Figure 1 shows the back plate (steel backing) and the friction material side in place in the brake pad.
As can be seen from FIGS. 2 to 3, the brake pad of comparative example 1 has a poor electrostatic coating effect because the steel backing side and the friction material side do not form a complete coating film. In example 1 coated with the conductive paste, the electrostatic spraying effect is significantly better, and both the steel backing side and the friction material side can form a flat and bright coating film, thereby achieving good decoration and rust prevention functions.
In addition, the brake pads prepared in example 1 and comparative example 1 were subjected to a salt spray resistance test (test method: ISO 9227; passing standard: neutral salt spray test 96h, no rust, blistering, cracking), and it was found that the brake pad of example 1 could pass the salt spray resistance test while the brake pad of comparative example 1 failed to meet the standards, indicating that the brake pad of example 1 has better salt spray resistance.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Claims (9)
1. A process for producing a brake pad comprising a copper-free NAO friction material, comprising the steps of:
(1) coating conductive paste in a mould, then placing the copper-free NAO friction material and a back plate in the mould for pressing, and demoulding to obtain a brake pad blank;
(2) and curing and electrostatic spraying are carried out on the brake pad blank to obtain the brake pad.
2. The production process according to claim 1, wherein the conductive paste in step (1) comprises the following components: graphite, phenolic resin and water glass.
3. The production process according to claim 2, wherein the conductive paste comprises the following components in parts by weight: 60-90 parts of graphite, 2-10 parts of phenolic resin and 2-12 parts of water glass.
4. The production process according to claim 1, wherein the coating in step (1) is performed by brush coating.
5. The process according to claim 1, wherein the pressing in step (1) is carried out by hot pressing.
6. The production process according to claim 4, wherein step (1) is to spray a release agent in the mold before applying the conductive paste.
7. The production process according to claim 1, wherein the curing in step (2) is a heat treatment.
8. The process of claim 1, wherein step (2) further comprises grinding the cured brake pad.
9. Brake pad comprising copper-free NAO friction material, characterized in that it is obtained by the manufacturing process according to any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210456680.2A CN114733736A (en) | 2022-04-27 | 2022-04-27 | Production process of brake pad containing copper-free NAO friction material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210456680.2A CN114733736A (en) | 2022-04-27 | 2022-04-27 | Production process of brake pad containing copper-free NAO friction material |
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| Publication Number | Publication Date |
|---|---|
| CN114733736A true CN114733736A (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210456680.2A Pending CN114733736A (en) | 2022-04-27 | 2022-04-27 | Production process of brake pad containing copper-free NAO friction material |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS588623A (en) * | 1981-07-10 | 1983-01-18 | Toyota Motor Corp | Electroconductive injection molding method of resin part |
| US5262207A (en) * | 1991-09-03 | 1993-11-16 | General Motors Corporation | Method of electrostatically coating nonconductive panels |
| JP2011060980A (en) * | 2009-09-10 | 2011-03-24 | Tayca Corp | Solid electrolytic capacitor |
| CN108518432A (en) * | 2018-03-08 | 2018-09-11 | 山东金麒麟股份有限公司 | A kind of no copper NAO friction materials and its preparation method and application |
-
2022
- 2022-04-27 CN CN202210456680.2A patent/CN114733736A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS588623A (en) * | 1981-07-10 | 1983-01-18 | Toyota Motor Corp | Electroconductive injection molding method of resin part |
| US5262207A (en) * | 1991-09-03 | 1993-11-16 | General Motors Corporation | Method of electrostatically coating nonconductive panels |
| JP2011060980A (en) * | 2009-09-10 | 2011-03-24 | Tayca Corp | Solid electrolytic capacitor |
| CN108518432A (en) * | 2018-03-08 | 2018-09-11 | 山东金麒麟股份有限公司 | A kind of no copper NAO friction materials and its preparation method and application |
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