CN114921154B - Heat-insulating anticorrosive paint for brake disc and preparation method thereof - Google Patents
Heat-insulating anticorrosive paint for brake disc and preparation method thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/085—Copper
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention relates to the technical field of metal corrosion prevention, in particular to a heat-insulating anticorrosive coating for a brake disc and a preparation method thereof, wherein the coating comprises a component A and a component B, and the mass ratio of the component A to the component B is 1:1-1.5. The component A comprises: 30-50 parts of metal powder, 10-20 parts of silane coupling agent and 10-15 parts of dispersing agent; the component B comprises: 15-30 parts of epoxy resin, 20-30 parts of phase change microcapsule, 5-10 parts of flatting agent, 10-20 parts of heat insulation filler and 50-70 parts of deionized water. The phase-change microcapsule is prepared by taking copper powder and tin powder as core materials and silicon dioxide as a wall material by a sol-gel method. The microcapsule core material will convert the temperature increase into a phase change of the material to keep the temperature constant. The coating has excellent heat-insulating property, can limit the temperature increase of a brake disc when an automobile is braked for a long time while the corrosion resistance is ensured, thereby enhancing the safety when the automobile is braked, and has simple preparation process and low cost.
Description
Technical Field
The invention relates to the technical field of metal corrosion prevention, in particular to a heat-insulating anticorrosive coating for a brake disc and a preparation method thereof.
Technical Field
Dacromet is a translation of DACROMET, is also called as a zinc-aluminum coating in China, is a novel metal anticorrosive coating taking zinc powder, aluminum powder, chromic acid and deionized water as main components, has the characteristics of high corrosion resistance, high heat resistance, no hydrogen embrittlement and simple preparation process compared with the traditional anticorrosive coating, and greatly reduces the pollution to the environment compared with the traditional processes such as electroplating, hot dipping and the like.
The automobile brake disc is a key part of an automobile brake system, and when an automobile is braked in normal running, a friction block made of friction materials rubs with the brake disc due to extrusion, so that the aim of reducing the speed of the automobile is fulfilled. However, when the automobile is frequently braked to generate friction, the brake pad is rapidly heated and gathered, so that the temperature of the brake disc is rapidly increased, the strength and the hardness of the brake disc are rapidly reduced at the moment, the plasticity is increased, the yield strength is reduced, the deformability and the destructiveness are increased, the friction coefficient is reduced, and the failure of a brake system is possibly caused, so that the traffic accident is caused. On the other hand, the brake disc is in a severe working environment, and the surface of the brake disc is generally coated with an anticorrosive coating in order to prevent rusting and damage, but the traditional brake disc anticorrosive coating can enhance the corrosion resistance of the brake disc, but cannot solve the problem of overhigh working temperature of the brake disc.
The patent application No. CN 201810932996.8 discloses a high-corrosion-resistance high-heat-resistance water-based brake disc coating, which takes heat-resistance water-based resin and antirust pigment as main film forming substances and has good corrosion resistance, but takes organic resin as a base material, so that the coating is easy to pulverize and has poor high-temperature resistance and heat insulation performance. The patent application No. CN201911074628.5 discloses a high-temperature curing inorganic anticorrosive coating for an automobile brake disc and a preparation method thereof. Although the invention solves the defects of poor high temperature resistance, poor hardness and the like of the anticorrosive coating taking the organic resin as the matrix to a certain extent, the invention also has the problems of poor adhesive force and appearance quality, and simultaneously has complex components, more reaction and difficult control in the synthesis process, and is not suitable for large-scale industrial production.
In view of the above, there is no zinc-aluminum coating that can solve the problem of too high operating temperature of the automobile brake disc, and therefore, it is necessary to develop a brake disc coating that can overcome the above-mentioned defects and has both corrosion resistance and heat insulation properties.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a heat-insulating anticorrosive coating for a brake disc, which can effectively prevent the problems of overhigh temperature and brake failure of a brake while ensuring the anticorrosive performance of the brake disc.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a heat-insulating anticorrosive coating for a brake disc comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1-1;
the component A is prepared from the following components in parts by mass: 30-50 parts of metal powder, 10-20 parts of silane coupling agent and 10-15 parts of dispersing agent;
the component B is prepared from the following components in parts by mass: 15-30 parts of epoxy resin, 20-30 parts of phase change microcapsule, 5-10 parts of flatting agent, 10-20 parts of heat insulation filler and 50-70 parts of deionized water.
Preferably, the silane coupling agent is selected from one or more of KH550, KH560 and KH 570.
Preferably, the dispersant is selected from one or more of methanol, ethanol, propylene glycol and polyethylene glycol.
Preferably, the metal powder comprises zinc powder and aluminum powder, and the mass ratio of the zinc powder to the aluminum powder is 3:1.
Preferably, the zinc powder is flaky, and the flake diameter is 8-20 mu m.
Preferably, the aluminum powder is in a scaly shape, and the flake diameter is 8-20 μm.
Preferably, the heat insulation filler is selected from one or more of hollow ceramic powder, titanium dioxide and diatomite.
Preferably, the phase-change microcapsule takes copper powder and tin powder as core materials and silicon dioxide as wall materials, the mass fraction of the core materials is 20-50%, and the particle size of the microcapsule is 50-500 um.
Preferably, the curing agent is dimethylcyclohexane.
A method for preparing a phase change microcapsule, the method comprising the steps of:
(1) Mixing tin powder and a small amount of nano copper powder according to a certain proportion, grinding by using a ball mill 50-150 r/min to obtain mixed powder, melting the mixed solid, stirring again, cooling, ball-milling by using the ball mill at the speed of 100-300 r/min for 50-70 min, and uniformly mixing to obtain copper-tin mixed particles;
(2) Weighing 20-30 parts by mass of deionized water, and adjusting the pH to 2-3. Then, 10 to 20 parts of ethanol and 10 to 20 parts of ethyl orthosilicate are sequentially added. Heating to 60 deg.C, stirring for 15 min to form sol;
(3) Adding 10-30 parts of copper-tin mixed particles into the solution, and stirring for 15 min;
(4) Stirring, putting into a constant temperature tank at 0-5 ℃, stirring again, adding the curing agent while stirring until stirring
Stirring into gel, and curing at constant temperature 2h
(5) And filtering the gel and drying the gel in vacuum for 3 h to obtain the phase-change microcapsule.
The invention also provides a preparation method of the anticorrosive heat-insulating coating for the brake disc, which comprises the following steps:
(1) Preparation of component A: under the condition of stirring, firstly, uniformly mixing zinc powder and silane coupling agent, and then
Adding aluminum powder, continuously stirring for 1-2 h, then adding a dispersing agent, and stirring for 2h until the components A are uniformly mixed to obtain a component A;
(2) Preparation of the component B: mixing epoxy resin, deionized water, heat-insulating filler and leveling agent, stirring
Stirring 1 h, adding the phase change microcapsule while stirring, and stirring 1 h until the mixture is uniformly stirred to obtain a component B;
(3) Mixing the component A and the component B in a mass ratio of 1:1-1.5, and stirring 6 h to obtain the product
And obtaining the heat-insulating anticorrosive paint for the brake disc.
The heat-insulating anticorrosive paint disclosed by the invention is low in heat conductivity coefficient, and the phase-change microcapsules in the paint take copper powder and tin powder as core materials and silicon dioxide as wall materials. Generally, the automobile brake pad loses the braking performance when the temperature exceeds 400-500 ℃, the phase transition temperature of the metal tin of the core material is about 231.9 ℃, the latent heat value is larger, and the copper powder enables the tin powder to be heated more uniformly, so that the safety during long-time braking is ensured. The microcapsule is adopted to wrap the phase change material as the core material, so that the loss of the phase change material can be prevented, the specific surface area is increased, the silicon dioxide of the wall material has certain strength, and the high-temperature resistance is good. The preparation process of the coating is simple, the cost is low, the phase change process can be reversibly operated for unlimited times in principle, and the coating has the advantages of high safety, high energy storage density, constant temperature and the like. The coating has good heat insulation performance, can effectively improve the braking efficiency of the brake, and can be used for a long time.
Detailed Description
The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to the examples.
A heat-insulating anticorrosive coating for a brake disc comprises a component A and a component B; the component A is prepared from the following components in parts by mass: 30-50 parts of metal powder, 10-20 parts of silane coupling agent and 10-15 parts of dispersing agent; the component B is prepared from the following components in parts by mass: 15-30 parts of epoxy resin, 20-30 parts of phase change microcapsule, 5-10 parts of flatting agent, 10-20 parts of heat insulation filler and 50-70 parts of deionized water.
Example 1
The heat-insulating anticorrosive paint for the brake disc is prepared from the following raw materials in parts by weight in sequence:
(1) Preparation of the component A: under the stirring condition, firstly, uniformly mixing 30 parts of zinc powder and 20 parts of silane coupling agent, then adding 10 parts of aluminum powder, continuously stirring for 1.5 h, then adding 10 parts of dispersing agent, and then stirring
2h until uniformly mixing to obtain a component A;
(2) Preparation of the component B: 20 portions of epoxy resin, 10 portions of heat insulation filler, 8 portions of flatting agent and 70 portions of
Mixing parts of deionized water, stirring the mixture for 1 h, then adding 25 parts of phase change microcapsules while stirring, and stirring the mixture for 1 h till the mixture is uniformly stirred to obtain a component B;
(3) Mixing the component A and the component B in a mass ratio of 1
And (4) coating.
Example 2
The heat-insulating anticorrosive paint for the brake disc is prepared from the following raw materials in parts by weight according to the following steps in sequence:
(1) Preparation of component A: under the stirring condition, firstly, uniformly mixing 30 parts of zinc powder and 20 parts of silane coupling agent, then adding 10 parts of aluminum powder, continuously stirring for 1 h, then adding 10 parts of dispersing agent, and then stirring for 2h until uniformly mixing to obtain a component A;
(2) Preparation of the component B: mixing 15 parts of epoxy resin, 15 parts of heat insulation filler, 8 parts of flatting agent and 70 parts of deionized water, stirring the mixture for 1 h, adding 25 parts of phase change microcapsules while stirring, and stirring the mixture for 1 h until the mixture is uniformly stirred to obtain a component B;
(3) Mixing the component A and the component B in a mass ratio of 1
And (4) coating.
Example 3
The heat-insulating anticorrosive paint for the brake disc is prepared from the following raw materials in parts by weight according to the following steps in sequence:
(1) Preparation of component A: under the condition of stirring, firstly mixing 30 parts of zinc powder and 18 parts of silane coupling agent
Uniformly mixing, then adding 10 parts of aluminum powder, continuously stirring for 2h, then adding 15 parts of dispersing agent, and stirring for 2 hours until the components A are uniformly mixed to obtain a component A;
(2) Preparation of the component B: 20 portions of epoxy resin, 5 portions of heat insulation filler, 8 portions of flatting agent and 70 portions of
Mixing parts of deionized water, stirring the mixture for 1 h, adding 30 parts of phase change microcapsules while stirring, and stirring the mixture for 1 h until the mixture is uniformly stirred to obtain a component B;
(3) Mixing the component A and the component B in a mass ratio of 1
And (4) coating.
Example 4
The heat-insulating anticorrosive paint for the brake disc is prepared from the following raw materials in parts by weight in sequence:
(1) Preparation of component A: under the condition of stirring, firstly mixing 30 parts of zinc powder and 18 parts of silane coupling agent
Uniformly mixing, then adding 10 parts of aluminum powder, continuously stirring 2h, then adding 15 parts of dispersing agent, and then stirring 2h until uniformly mixing to obtain a component A;
(2) Preparation of the component B: 15 portions of epoxy resin, 15 portions of heat insulation filler, 8 portions of flatting agent and 70 portions of
Mixing parts of deionized water, stirring the mixture for 1 h, adding 30 parts of phase change microcapsules while stirring, and stirring the mixture for 1 h until the mixture is uniformly stirred to obtain a component B;
(3) Mixing the component A and the component B in a mass ratio of 1
And (4) coating.
Example 5
The heat-insulating anticorrosive paint for the brake disc is prepared from the following raw materials in parts by weight according to the following steps in sequence:
(1) Preparation of the component A: under the condition of stirring, firstly mixing 30 parts of zinc powder and 18 parts of silane coupling agent
Uniformly mixing, then adding 10 parts of aluminum powder, continuously stirring for 2h, then adding 10 parts of dispersing agent, and then stirring for 2h until uniformly mixing to obtain a component A;
(2) Preparation of the component B: 20 portions of epoxy resin, 15 portions of heat insulation filler, 8 portions of flatting agent and 70 portions of
Mixing parts of deionized water, stirring the mixture for 1 h, adding 20 parts of phase change microcapsules while stirring, and stirring the mixture for 1 h until the mixture is uniformly stirred to obtain a component B;
(4) Mixing the component A and the component B in a mass ratio of 1
And (4) coating.
Example 6
The heat-insulating anticorrosive paint for the brake disc is prepared from the following raw materials in parts by weight according to the following steps in sequence:
(1) Preparation of the component A: under the condition of stirring, firstly mixing 30 parts of zinc powder and 20 parts of silane coupling agent
Uniformly mixing, then adding 10 parts of aluminum powder, continuously stirring for 2h, then adding 12 parts of dispersing agent, and then stirring for 2h until uniformly mixing to obtain a component A;
(2) Preparation of the component B: 25 parts of epoxy resin, 10 parts of heat insulation filler, 8 parts of flatting agent and 70 parts of
Mixing parts of deionized water, stirring 1 h, then adding 20 parts of phase change microcapsules, and continuously stirring 1 h until the mixture is uniformly stirred to obtain a component B;
(5) Mixing the component A and the component B in a mass ratio of 1:1, and stirring the mixture for 6 h to obtain the heat insulation and corrosion prevention coating
And (4) coating.
The properties of the heat insulating anticorrosive materials prepared in examples 1 to 6 are shown in Table 1
As can be seen from the table 1, different embodiments of the invention have good film forming performance and salt spray resistance, the paint film can be ensured not to change color for a long time at the high temperature of 300 ℃, after the paint film is naturally cooled to the room temperature, the coating of a spraying area does not have any phenomena of foaming, cracking and falling off, and the thermal conductivity coefficient of the thermal insulation coating provided by the invention is about 0.065-0.082W/m.k, and the thermal insulation coating has good thermal insulation performance.
The brake disc brake test is carried out through a 1:1 dynamic brake test bed, the brake pad material of the brake test is a copper-based powder metallurgy material, the maximum working temperature of different embodiments and a bare brake disc is tested by using an infrared thermal imager under the conditions that the initial temperature is 25 ℃, the initial brake speed is 120 km/h and the brake pressure is 0.8 MPa, and the brake time is 8 s.
The maximum test temperatures for examples 1-6 and bare brake discs are shown in Table 2
The experimental result shows that compared with a naked brake disc, the brake disc coated by the coating disclosed by the invention has lower surface temperature in a long-time braking process, so that the brake failure can be effectively prevented.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The application of the heat-insulating anticorrosive paint on the brake disc is characterized by comprising a component A and a component B, wherein the component A and the component B are in a mass ratio of 1:1-1.5;
the component A is prepared from the following components in parts by mass: 30-50 parts of metal powder, 10-20 parts of silane coupling agent and 10-15 parts of dispersing agent;
the metal powder comprises zinc powder and aluminum powder, and the mass ratio of the zinc powder to the aluminum powder is 3:1;
the component B is prepared from the following components in parts by mass: 15-30 parts of epoxy resin, 20-30 parts of phase change microcapsule, 5-10 parts of flatting agent, 10-20 parts of heat insulation filler and 50-70 parts of deionized water;
the phase change microcapsule is prepared by taking copper powder and tin powder as core materials and silicon dioxide as wall materials in the following way:
(1) Mixing and grinding tin powder and nano copper powder according to a certain proportion to obtain mixed powder, melting the mixed metal powder, stirring, cooling, and grinding again to obtain copper-tin composite particles;
(2) Weighing 20-30 parts by mass of deionized water, adjusting the pH to 2-3, then sequentially adding 10-20 parts of ethanol and 10-20 parts of tetraethoxysilane, heating to 60 ℃, and stirring for 15 min to form sol;
(3) Dispersing 10-30 parts of mixed particles of copper powder and tin powder in the solution, and stirring for 15 min;
(4) Stirring, putting into a constant temperature tank at 0-5 ℃, stirring again, adding the curing agent while stirring until the curing agent is stirred into gel, stopping stirring, and curing at constant temperature for 2 h;
(5) And filtering the gel and drying the gel in vacuum for 3 h to obtain the phase-change microcapsule.
2. The use of a heat-insulating anticorrosive coating for brake disks as claimed in claim 1, characterized in that the zinc powder is in the form of flakes having a flake diameter of 8 to 20 μm; the aluminum powder is in a scale shape, and the flake diameter is 8-20 mu m.
3. The use of a thermal insulating anticorrosive coating on brake disks according to claim 1, characterized in that the silane coupling agent is selected from one or more of KH550, KH560 and KH 570.
4. The application of the heat-insulating anticorrosive paint on the brake disc as claimed in claim 1, wherein the dispersant is one or more selected from methanol, ethanol, propylene glycol and polyethylene glycol.
5. The use of a thermal insulation anticorrosive coating on a brake disc according to claim 1, wherein the thermal insulation filler is selected from one or more of hollow ceramic powder, titanium dioxide and diatomite.
6. The application of the heat-insulating anticorrosive coating on the brake disc as claimed in claim 1, characterized in that the particle size of the phase-change microcapsules is 50-500 um.
7. The application of the heat-insulating anticorrosive paint on the brake disc as claimed in claim 1, characterized in that the preparation method comprises the following steps:
(1) Preparation of the component A: under the stirring condition, firstly uniformly mixing zinc powder and a silane coupling agent, then adding the aluminum powder, continuously stirring for 1-2 h, then adding a dispersing agent, and then stirring for 2h until uniformly mixing to obtain a component A;
(2) Preparation of the component B: mixing epoxy resin, deionized water, a heat insulation filler and a leveling agent, stirring the mixture for 1 h, then adding the self-made phase change microcapsules, and stirring the mixture for 1 h to be uniform to obtain a component B;
(3) Mixing the component A and the component B in a mass ratio of 1:1-1.5, and stirring 6 h to obtain the heat-insulating anticorrosive coating for the brake disc.
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