Preparation process of ceramic friction material for automobile brake pad
阅读说明：本技术 一种汽车刹车片用陶瓷摩擦材料制备工艺 (Preparation process of ceramic friction material for automobile brake pad ) 是由 戴金宝 于 2020-12-10 设计创作，主要内容包括：本发明公开了一种汽车刹车片用陶瓷摩擦材料制备工艺；涉及汽车刹车片技术领域,包括以下步骤：(1)得到复合改性粉煤灰；得到基体树脂；得到偶联剂处理料；得到预混料；(5)将上述得到的预混料添加到模具中,然后经过热压成型,再进行冷却至室温,即得；本发明方法制备的汽车刹车片用陶瓷材料具有更低的摩擦系数。(The invention discloses a preparation process of a ceramic friction material for an automobile brake pad; relates to the technical field of automobile brake pads, comprising the following steps: (1) obtaining composite modified fly ash; obtaining matrix resin; obtaining a coupling agent treatment material; obtaining a premix; (5) adding the obtained premix into a mold, then carrying out hot press molding, and cooling to room temperature to obtain the product; the ceramic material for the automobile brake pad prepared by the method has a lower friction coefficient.)
1. A preparation process of a ceramic friction material for an automobile brake pad is characterized by comprising the following steps:
(1) uniformly dispersing the fly ash into dichloromethane, heating to 80-90 ℃, preserving heat for 15-20min, adding piperidine-4-yl tert-butyl carbamate, graphite powder and triethylamine, adjusting the temperature to 45-50 ℃, preserving heat, stirring, reacting for 2-3 h, performing suction filtration, washing, and drying to constant weight to obtain composite modified fly ash;
(2) mixing phenolic resin and chloroprene rubber powder together to obtain matrix resin;
(3) mixing alumina, montmorillonite, attapulgite and zeolite, then treating by using a coupling agent, and drying to obtain a coupling agent treatment material;
(4) mixing the composite modified fly ash, the matrix resin and the coupling agent treatment material together, and then stirring at the rotating speed of 2000r/min for 40-50min to obtain a premix;
(5) adding the obtained premix into a mold, performing hot press molding, and cooling to room temperature to obtain the product.
2. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1, wherein the ceramic friction material comprises the following steps: the mixing mass ratio of the fly ash to the dichloromethane is 1: 5-5.5;
the mixing mass ratio of the fly ash, the piperidine-4-yl tert-butyl carbamate, the graphite powder and the triethylamine is 35-40:5-5.8:3.1-3.6: 1-1.5.
3. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1, wherein the ceramic friction material comprises the following steps: the mixing mass ratio of the phenolic resin to the chloroprene rubber powder is 15: 1-2.
4. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1, wherein the ceramic friction material comprises the following steps: the mixing mass ratio of the alumina powder, the montmorillonite powder, the attapulgite powder and the basalt fiber is 15-18: 8-10:8-10: 1-2;
the mixing mass ratio of the alumina powder to the coupling agent solution is 1: 10.
5. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1 or 4, wherein the ceramic friction material comprises the following steps: the alumina powder, the montmorillonite powder and the attapulgite powder are all 300 meshes.
6. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1 or 4, wherein the ceramic friction material comprises the following steps: the mass fraction of the coupling agent solution is 9.2%;
the coupling agent solution is a vinyl triethoxysilane solution.
7. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1, wherein the ceramic friction material comprises the following steps: the coupling agent treatment is coupling agent impregnation treatment, the material-liquid ratio is 1:10, the impregnation temperature is 65 ℃, and the impregnation time is 1.5 hours.
8. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1, wherein the ceramic friction material comprises the following steps: the mixing mass ratio of the composite modified fly ash to the matrix resin to the coupling agent treatment material is 12-16:5-7: 30-35.
9. The preparation process of the ceramic friction material for the automobile brake pad according to claim 1, wherein the ceramic friction material comprises the following steps: the technological parameters of the hot-press molding are as follows: the hot pressing temperature is 185-188 ℃, the hot pressing pressure is 55-60MPa, and the hot pressing time is 8-9 min.
Technical Field
The invention belongs to the technical field of automobile brake pads, and particularly relates to a preparation process of a ceramic friction material for an automobile brake pad.
Background
In recent years, automobile manufacturing gradually develops towards safety, environmental protection, high speed and long service life, which puts higher requirements on the comprehensive performance of an automobile braking system and the high-temperature stability and reliability of brake pad materials. As an important material of a friction transmission braking system, a friction material needs to have high compressive strength, a high friction coefficient, a low wear rate, excellent stability and the like.
In recent years, with the high-speed development of the automobile industry in China towards high-speed heavy load, safety, comfort, environmental protection and the like, more rigorous performance requirements are provided for friction materials of key components in an automobile braking system, and with the higher performance requirements of people on brake pads, the improvement of the friction materials of the brake pads is carried out, however, the improvement effect of the prior art is limited, particularly the high-temperature-resistant friction effect is relatively poor, the performance of the friction materials is remarkably reduced, and the service life of the friction materials is greatly shortened.
Disclosure of Invention
The invention aims to provide a preparation process of a ceramic friction material for an automobile brake pad, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a preparation process of a ceramic friction material for an automobile brake pad comprises the following steps:
(1) uniformly dispersing the fly ash into dichloromethane, heating to 80-90 ℃, preserving heat for 15-20min, adding piperidine-4-yl tert-butyl carbamate, graphite powder and triethylamine, adjusting the temperature to 45-50 ℃, preserving heat, stirring, reacting for 2-3 h, performing suction filtration, washing, and drying to constant weight to obtain composite modified fly ash;
(2) mixing phenolic resin and chloroprene rubber powder together to obtain matrix resin;
(3) mixing alumina, montmorillonite, attapulgite and zeolite, then treating by using a coupling agent, and drying to obtain a coupling agent treatment material;
(4) mixing the composite modified fly ash, the matrix resin and the coupling agent treatment material together, and then stirring at the rotating speed of 2000r/min for 40-50min to obtain a premix;
(5) adding the obtained premix into a mold, performing hot press molding, and cooling to room temperature to obtain the product.
The mixing mass ratio of the fly ash to the dichloromethane is 1: 5-5.5;
the mixing mass ratio of the fly ash, the piperidine-4-yl tert-butyl carbamate, the graphite powder and the triethylamine is 35-40:5-5.8:3.1-3.6: 1-1.5.
The mixing mass ratio of the phenolic resin to the chloroprene rubber powder is 15: 1-2.
The mixing mass ratio of the alumina powder, the montmorillonite powder, the attapulgite powder and the basalt fiber is 15-18: 8-10:8-10: 1-2;
the mixing mass ratio of the alumina powder to the coupling agent solution is 1: 10.
The alumina powder, the montmorillonite powder and the attapulgite powder are all 300 meshes.
The mass fraction of the coupling agent solution is 9.2%;
the coupling agent solution is a vinyl triethoxysilane solution.
The coupling agent treatment is coupling agent impregnation treatment, the material-liquid ratio is 1:10, the impregnation temperature is 65 ℃, and the impregnation time is 1.5 hours.
The mixing mass ratio of the composite modified fly ash to the matrix resin to the coupling agent treatment material is 12-16:5-7: 30-35.
The technological parameters of the hot-press molding are as follows: the hot pressing temperature is 185-188 ℃, the hot pressing pressure is 55-60MPa, and the hot pressing time is 8-9 min.
The ceramic material for the automobile brake pad prepared by the method has the advantages that the components are uniformly distributed, the filler particles are mutually and tightly combined together through the adhesive, the microstructure of the ceramic material is more obviously changed by introducing a certain amount of basalt fiber, and the basalt fiber which is distributed in a staggered manner is connected with the components in a framework form, so that the inorganic and organic components of the ceramic material for the automobile brake pad are more tightly combined, and the surface wear resistance is greatly improved.
Under the high-temperature condition, the automobile brake pad material is subjected to the synergistic use of a large amount of inorganic and organic materials, the materials are mutually combined, and a friction film and a transfer film can be quickly formed during friction, so that the surface wear resistance is improved, the friction resistance is reduced, and the friction loss is reduced; the automobile brake pad material prepared by the method has stable friction coefficient at low temperature, does not cause abrasion to the brake pad, and has complete and smooth surface; however, at high temperatures, a small portion of the resin matrix is decomposed, and oil is generated on the surface and adheres to the friction interface, resulting in a decrease in the coefficient of friction.
Has the advantages that:
the ceramic material for the automobile brake pad prepared by the method has a lower friction coefficient, the friction coefficient is increased firstly and then reduced along with the increase of the temperature, and the change is smaller when the temperature reaches a certain value.
Drawings
FIG. 1 is a micro-topography of composite modified fly ash.
Detailed Description
A preparation process of a ceramic friction material for an automobile brake pad comprises the following steps:
(1) uniformly dispersing the fly ash into dichloromethane, heating to 80-90 ℃, preserving heat for 15-20min, adding piperidine-4-yl tert-butyl carbamate, graphite powder and triethylamine, adjusting the temperature to 45-50 ℃, preserving heat, stirring, reacting for 2-3 h, performing suction filtration, washing, and drying to constant weight to obtain composite modified fly ash;
(2) mixing phenolic resin and chloroprene rubber powder together to obtain matrix resin;
(3) mixing alumina, montmorillonite, attapulgite and zeolite, then treating by using a coupling agent, and drying to obtain a coupling agent treatment material;
(4) mixing the composite modified fly ash, the matrix resin and the coupling agent treatment material together, and then stirring at the rotating speed of 2000r/min for 40-50min to obtain a premix;
(5) adding the obtained premix into a mold, performing hot press molding, and cooling to room temperature to obtain the product.
The mixing mass ratio of the fly ash to the dichloromethane is 1: 5-5.5;
the mixing mass ratio of the fly ash, the piperidine-4-yl tert-butyl carbamate, the graphite powder and the triethylamine is 35-40:5-5.8:3.1-3.6: 1-1.5.
The mixing mass ratio of the phenolic resin to the chloroprene rubber powder is 15: 1-2.
The mixing mass ratio of the alumina powder, the montmorillonite powder, the attapulgite powder and the basalt fiber is 15-18: 8-10:8-10: 1-2;
the mixing mass ratio of the alumina powder to the coupling agent solution is 1: 10.
The alumina powder, the montmorillonite powder and the attapulgite powder are all 300 meshes.
The mass fraction of the coupling agent solution is 9.2%;
the coupling agent solution is a vinyl triethoxysilane solution.
The coupling agent treatment is coupling agent impregnation treatment, the material-liquid ratio is 1:10, the impregnation temperature is 65 ℃, and the impregnation time is 1.5 hours.
The mixing mass ratio of the composite modified fly ash to the matrix resin to the coupling agent treatment material is 12-16:5-7: 30-35.
The technological parameters of the hot-press molding are as follows: the hot pressing temperature is 185-188 ℃, the hot pressing pressure is 55-60MPa, and the hot pressing time is 8-9 min.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation process of a ceramic friction material for an automobile brake pad comprises the following steps:
(1) uniformly dispersing the fly ash into dichloromethane, heating to 80 ℃, preserving heat for 15min, adding piperidine-4-yl tert-butyl carbamate, graphite powder and triethylamine, adjusting the temperature to 45 ℃, preserving heat, stirring, reacting for 2 hours, performing suction filtration, washing and drying to constant weight to obtain composite modified fly ash; the mixing mass ratio of the fly ash to the dichloromethane is 1: 5; the mixing mass ratio of the fly ash, the piperidine-4-yl tert-butyl carbamate, the graphite powder and the triethylamine is 35:5:3.1: 1.
(2) Mixing phenolic resin and chloroprene rubber powder together to obtain matrix resin; the mixing mass ratio of the phenolic resin to the chloroprene rubber powder is 15:1.
(3) Mixing alumina, montmorillonite, attapulgite and zeolite, then treating by using a coupling agent, and drying to obtain a coupling agent treatment material; the mixing mass ratio of the alumina powder, the montmorillonite powder, the attapulgite powder and the basalt fiber is 15: 8:8: 1; the mixing mass ratio of the alumina powder to the coupling agent solution is 1: 10. The alumina powder, the montmorillonite powder and the attapulgite powder are all 300 meshes. The mass fraction of the coupling agent solution is 9.2%; the coupling agent solution is a vinyl triethoxysilane solution. The coupling agent treatment is coupling agent impregnation treatment, the material-liquid ratio is 1:10, the impregnation temperature is 65 ℃, and the impregnation time is 1.5 hours.
(4) Mixing the composite modified fly ash, the matrix resin and the coupling agent treatment material together, and then stirring at the rotating speed of 2000r/min for 40min to obtain a premix; the mixing mass ratio of the composite modified fly ash to the matrix resin to the coupling agent treatment material is 12:5: 30.
(5) Adding the obtained premix into a mold, performing hot press molding, and cooling to room temperature to obtain the product. The technological parameters of the hot-press molding are as follows: the hot pressing temperature is 185 ℃, the hot pressing pressure is 55MPa, and the hot pressing time is 8 min.
Example 2
A preparation process of a ceramic friction material for an automobile brake pad comprises the following steps:
(1) uniformly dispersing the fly ash into dichloromethane, heating to 90 ℃, preserving heat for 20min, adding piperidine-4-yl tert-butyl carbamate, graphite powder and triethylamine, adjusting the temperature to 50 ℃, preserving heat, stirring, reacting for 3 hours, performing suction filtration, washing and drying to constant weight to obtain composite modified fly ash; the mixing mass ratio of the fly ash to the dichloromethane is 1: 5.5; the mixing mass ratio of the fly ash, the piperidine-4-yl tert-butyl carbamate, the graphite powder and the triethylamine is 40:5.8:3.6: 1.5.
(2) Mixing phenolic resin and chloroprene rubber powder together to obtain matrix resin; the mixing mass ratio of the phenolic resin to the chloroprene rubber powder is 15: 2.
(3) Mixing alumina, montmorillonite, attapulgite and zeolite, then treating by using a coupling agent, and drying to obtain a coupling agent treatment material; the mixing mass ratio of the alumina powder, the montmorillonite powder, the attapulgite powder and the basalt fiber is 18: 10:10: 2; the mixing mass ratio of the alumina powder to the coupling agent solution is 1: 10. The alumina powder, the montmorillonite powder and the attapulgite powder are all 300 meshes. The mass fraction of the coupling agent solution is 9.2%; the coupling agent solution is a vinyl triethoxysilane solution. The coupling agent treatment is coupling agent impregnation treatment, the material-liquid ratio is 1:10, the impregnation temperature is 65 ℃, and the impregnation time is 1.5 hours.
(4) Mixing the composite modified fly ash, the matrix resin and the coupling agent treatment material together, and then stirring at the rotating speed of 2000r/min for 50min to obtain a premix; the mixing mass ratio of the composite modified fly ash to the matrix resin to the coupling agent treatment material is 16:7: 35.
(5) Adding the obtained premix into a mold, performing hot press molding, and cooling to room temperature to obtain the product. The technological parameters of the hot-press molding are as follows: the hot pressing temperature is 188 ℃, the hot pressing pressure is 60MPa, and the hot pressing time is 9 min.
Example 3
A preparation process of a ceramic friction material for an automobile brake pad comprises the following steps:
(1) uniformly dispersing the fly ash into dichloromethane, heating to 86 ℃, preserving heat for 18min, adding piperidine-4-yl tert-butyl carbamate, graphite powder and triethylamine, adjusting the temperature to 48 ℃, preserving heat, stirring, reacting for 2.5 hours, then performing suction filtration, washing and drying to constant weight to obtain composite modified fly ash; the mixing mass ratio of the fly ash to the dichloromethane is 1: 5.2; the mixing mass ratio of the fly ash, the piperidine-4-yl tert-butyl carbamate, the graphite powder and the triethylamine is 38:5.4:3.5: 1.2.
(2) Mixing phenolic resin and chloroprene rubber powder together to obtain matrix resin; the mixing mass ratio of the phenolic resin to the chloroprene rubber powder is 15: 1.3.
(3) Mixing alumina, montmorillonite, attapulgite and zeolite, then treating by using a coupling agent, and drying to obtain a coupling agent treatment material; the mixing mass ratio of the alumina powder, the montmorillonite powder, the attapulgite powder and the basalt fiber is 16.5: 9.3:9.3: 1.6; the mixing mass ratio of the alumina powder to the coupling agent solution is 1: 10. The alumina powder, the montmorillonite powder and the attapulgite powder are all 300 meshes. The mass fraction of the coupling agent solution is 9.2%; the coupling agent solution is a vinyl triethoxysilane solution. The coupling agent treatment is coupling agent impregnation treatment, the material-liquid ratio is 1:10, the impregnation temperature is 65 ℃, and the impregnation time is 1.5 hours.
(4) Mixing the composite modified fly ash, the matrix resin and the coupling agent treatment material together, and then stirring at the rotating speed of 2000r/min for 44min to obtain a premix; the mixing mass ratio of the composite modified fly ash to the matrix resin to the coupling agent treatment material is 14.5:6: 32.
(5) Adding the obtained premix into a mold, performing hot press molding, and cooling to room temperature to obtain the product. The technological parameters of the hot-press molding are as follows: the hot pressing temperature is 186 ℃, the hot pressing pressure is 58MPa, and the hot pressing time is 8.6 min.
Test of
The samples were subjected to high temperature frictional wear tests at 20, 200, 300 and 400 ℃. A HT1000 type high-temperature tester is adopted, and a Si3N4 ceramic ball with the diameter of 6 mm is used as a grinding ball, the rotating radius is 4 mm, and the grinding ball is abraded for 30 min at the rotating speed of 300 r/min. Each set of experiments was performed 10 times, and the average value was taken:
TABLE 1
TABLE 2
Comparative example 1: the difference from the example 3 is that the composite modified fly ash is not added;
as can be seen from tables 1 and 2, the ceramic material for the automobile brake pad prepared by the method has a lower friction coefficient, the friction coefficient is increased firstly and then reduced along with the increase of the temperature, and the change is smaller when the temperature reaches a certain value.
An HMV-2T type microhardness instrument is selected for microhardness test of the sample, the test load is 490.3 mN, the loading time is 15 s, each group of experiments are carried out for 10 times, and the average value is obtained:
TABLE 3
As can be seen from Table 3, the automobile brake pad material prepared by the method has higher hardness, and the wear resistance of the automobile brake pad material can be greatly improved by increasing the hardness, so that the service life of the automobile brake pad is prolonged.
FIG. 1 is a micro-topography of composite modified fly ash.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.