CN117447915A - Anticorrosive paint for brake disc and preparation method of brake disc coating - Google Patents

Anticorrosive paint for brake disc and preparation method of brake disc coating Download PDF

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Publication number
CN117447915A
CN117447915A CN202311388023.XA CN202311388023A CN117447915A CN 117447915 A CN117447915 A CN 117447915A CN 202311388023 A CN202311388023 A CN 202311388023A CN 117447915 A CN117447915 A CN 117447915A
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Prior art keywords
coating
component
parts
solvent
brake disc
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Chinese (zh)
Inventor
高彦峰
陈长
周江维
秦智俊
曹培
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SHANGHAI UNIVERSITY HEAT-TREATMENT CO LTD
University of Shanghai for Science and Technology
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SHANGHAI UNIVERSITY HEAT-TREATMENT CO LTD
University of Shanghai for Science and Technology
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Priority to CN202311388023.XA priority Critical patent/CN117447915A/en
Publication of CN117447915A publication Critical patent/CN117447915A/en
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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
    • 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
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
    • 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
    • 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
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • 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
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • 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
    • C09D5/103—Anti-corrosive paints containing metal dust containing Al
    • 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
    • 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
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • 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
    • B05D2518/00—Other type of polymers
    • B05D2518/10—Silicon-containing polymers
    • 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
    • B05D2601/00—Inorganic fillers
    • B05D2601/20—Inorganic fillers used for non-pigmentation effect
    • 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
    • B05D2601/00—Inorganic fillers
    • B05D2601/20—Inorganic fillers used for non-pigmentation effect
    • B05D2601/28—Metals
    • 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
    • C08K2003/0812—Aluminium
    • 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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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses an anti-corrosion coating for a brake disc, which comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1.33-1:10; wherein the component A comprises 20-30 parts of metal powder, 24 parts of solvent, 4 parts of dispersing agent and 2-4 parts of passivating agent; the component B is a silicon-based polymer, and comprises 78 parts of organic silicon, 29 parts of deionized water and 185-640 parts of solvent. According to the anti-corrosion coating for the brake disc and the preparation method of the coating of the brake disc, disclosed by the invention, the organic silicon is subjected to hydrolysis pretreatment to obtain the film-forming component with high silicon content, chromium oxide is replaced to be used as a high-temperature-resistant adhesive, rare earth ions are introduced to replace chromium ions to passivate zinc and aluminum powder, so that the temperature resistance of the coating is improved, and the obtained zinc-aluminum coating can bear high temperature of 300 ℃ and still has long-acting anti-corrosion performance.

Description

Anticorrosive paint for brake disc and preparation method of brake disc coating
Technical Field
The invention relates to the field of metal corrosion prevention, in particular to an anti-corrosion coating for a brake disc and a preparation method of a brake disc coating.
Background
When the automobile brake disc works, heat is generated due to high-speed friction, and the temperature can be changed rapidly in a short time, so that the temperature resistance and the thermal shock resistance of the anticorrosive paint are higher than those of the traditional anticorrosive paint. The early anti-corrosion coating for the brake disc is Dacromet coating, and is gradually eliminated by the automobile industry due to chromium ions with higher toxicity. As an alternative chromium-free zinc-aluminum coating, the coating can not achieve the level of Dacromet due to the fact that the coating can not have the functions of adhesion film formation and passivation, and particularly, the coating can not achieve the level of Dacromet in the aspects of high temperature and thermal shock. According to the automotive brake disc corrosion resistance test standard (GB/T18684-2002), the coating needs to be pretreated for 1 hour at 300 ℃ before the corrosion resistance test. Related studies have also shown that the corrosion resistance of corrosion-resistant coatings decreases significantly as the heat treatment temperature increases (yellow flat, tang Changlin, fan Meimei, etc. automotive brake disc coating graphene modified zinc aluminum water paint process [ J ]. Automotive process and materials, 2017, (04): 15-17.). This is mainly because most of the binder component replacing chromium is decomposed and condensed under the treatment conditions, and the strength, toughness, cohesiveness and the like thereof are lowered, holes, cracks and the like are generated, and the binder component becomes a corrosive passage, resulting in lowering of the corrosion resistance of the coating. Currently, salt spray resistance standards for automotive brake disc corrosion resistant coatings are typically 150-240 hours, including imported coatings that occupy a large number of markets, such as jemeit JH310, C40, jiumet 360, and the like. In contrast, the salt spray resistance of the normal temperature anti-corrosion coating can easily reach more than 1000 hours.
In chromium-free zinc-aluminum coatings, the binder component for chromium substitution is typically silicate, organosilicon, organotitanium, phosphate, molybdate, or the like. The pure inorganic component is not organic in the aspects of film formation and thermal shock resistance, and is an organic-inorganic composite component represented by organic silicon and titanium, and the composite component has both inorganic temperature resistance and organic toughness and better comprehensive performance. In particular to an organosilicon system, which is widely applied in high-temperature resistant paint (Chen Zhixin, zhang Xiang, cai Ke. Research progress of high-temperature resistant and anticorrosive paint at home and abroad [ J ]. Petroleum pipe and instrument, 2019,5 (05): 88-91). However, for organic systems, 300 ℃ is a relatively difficult obstacle to crossing, and many reported organosilicon materials that can be used at higher temperatures actually decompose during the temperature rise process and eventually convert to silica to maintain the film strength. From the perspective of corrosion prevention, the corrosion prevention performance of the paint is greatly weakened. Conventional silicone components, such as methyl phenyl silicone, have a weight loss of more than 5% at 300 ℃ and are used for a long time only to about 220-240 ℃ ([ Wang Yongxi, yan Jiawei, any Jiang Tao ] development of silicone high temperature resistant coatings [ J ]. Modern coatings and applications, 2023,26 (05): 11-14).
Disclosure of Invention
In view of the defects in the prior art, the technical problem to be solved by the invention is that the salt spray resistance of the existing brake disc anti-corrosion paint or chromium-free zinc-aluminum paint is reduced after being treated for 1h at 300 ℃, the neutral salt spray resistance of the paint is 220-250h at a common level, and the appearance of the paint is unchanged after being treated for 1h at 300 ℃, but the anti-corrosion performance of the paint is obviously degraded. The invention provides an anti-corrosion coating for a brake disc and a preparation method of the coating of the brake disc, which are characterized in that organic silicon is subjected to hydrolysis pretreatment to obtain a film forming component with high silicon content, chromium oxide is replaced to be used as a high-temperature-resistant adhesive, rare earth ions (such as cerium, lanthanum, nickel and the like) are introduced to replace the chromium ions to passivate zinc and aluminum powder, so that the temperature resistance of the coating is improved, and the obtained zinc-aluminum coating can bear high temperature of 300 ℃ and still has long-acting anti-corrosion performance.
In order to achieve the aim, the invention provides an anticorrosive paint for a brake disc, which comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1.33-1:10; wherein,
the component A comprises 20-30 parts of metal powder, 24 parts of solvent, 4 parts of dispersing agent and 2-4 parts of passivating agent;
the component B is a silicon-based polymer, and comprises 78 parts of organic silicon, 29 parts of deionized water and 185-640 parts of solvent.
Further, the metal powder in the component A is flaky zinc powder and aluminum powder, the mass ratio of the zinc powder to the aluminum powder is 3-7:1, the average size of the zinc powder and the aluminum powder is 20-40 microns, the solvent is one or more of ethanol, ethylene glycol and dipropylene glycol, the dispersing agent is polyethylene glycol, and the passivating agent is one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate.
Further, the preparation method of the component A comprises the following steps:
mixing the metal powder and the solvent, and stirring for a certain time;
adding the dispersing agent and the passivating agent, and continuing stirring for a certain time to obtain a final product.
Further, the organic silicon in the component B is one or more of isopropyl orthosilicate, tetrabutyl orthosilicate and tetrapropyl orthosilicate, and the solvent is one or more of ethanol, ethylene glycol and dipropylene glycol.
Further, the preparation method of the component B comprises the following steps:
adjusting the pH of deionized water to 1.1-1.3 by using acid, adding a solvent with the mass 2-5 times that of the solvent, and uniformly stirring to obtain acid liquor, wherein the acid is one of hydrochloric acid, nitric acid, acetic acid or sulfuric acid; mixing and aging the organic silicon solution and the acid liquor, which is the hydrolysis and polycondensation process of organic silicon, and obtaining silicon alkoxide which is partially hydrolyzed and polycondensed, so as to obtain a film forming component with high silicon content;
adding 1-2 times of solvent into the organic silicon, and uniformly stirring to obtain an organic silicon solution;
dropwise adding the acid liquor into the organic silicon liquor, and simultaneously keeping the liquor stirred;
adding the rest solvent, stirring, standing at 60-70deg.C, and aging for 3-5 days.
The invention provides a preparation method of an anticorrosive paint for a brake disc, which is applied to a brake disc coating and comprises the following steps of:
mixing the component A and the component B, and uniformly stirring to obtain a coating C;
according to the construction viscosity requirement, adding a solvent or a thickener to adjust the viscosity of the coating C;
preparing a coating by adopting a spraying process;
and (3) after the coating is dried at room temperature, annealing at a high temperature to obtain the coating.
Further, the method comprises the following steps:
mixing the component A and the component B, and uniformly stirring to obtain a coating C;
according to the construction viscosity requirement, adding a solvent or a thickener to adjust the viscosity of the coating C;
preparing a coating by adopting a spraying process, and obtaining a first coating after surface drying at 60-100 ℃;
adopting a spraying process, and preparing a coating on the surface of the first coating by using the component B to obtain a second coating;
and after the second coating is dried at room temperature, annealing at a high temperature to obtain the final brake disc coating.
Further, the thickener includes polyethylene glycol and cellulose.
Further, the thickness of the first coating is less than or equal to 30 micrometers, the thickness of the second coating is less than or equal to 1 micrometer, and the high-temperature annealing process comprises a heating speed, an annealing temperature and an annealing time, wherein the heating speed is 1-100 ℃/min, the annealing temperature is 300-350 ℃, and the annealing time is 10-30min.
Technical effects
According to the anti-corrosion coating for the brake disc and the preparation method of the brake disc coating, the anti-corrosion coating is a chromium-free anti-corrosion coating and is specially used for corrosion prevention of an automobile brake disc, through pretreatment and passivation treatment of zinc aluminum powder, high silicon polymer obtained by combining with organosilicon hydrolysis is used as a temperature-resistant adhesive, when the dry film thickness obtained after heat treatment of the first coating is 20 microns, the neutral salt spray resistance is greater than 900 hours after treatment at 300 ℃, after a second coating is added on the surface, the condensation polymerization product (organosilicon after hydrolytic polycondensation) is coated on the top layer to be subjected to hole sealing treatment, so that the neutral salt spray resistance can be increased, and the neutral salt spray resistance is improved to 1000 hours.
The conception, specific structure, and technical effects of the present invention will be further described below to fully understand the objects, features, and effects of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular internal procedures, techniques, etc. in order to provide a thorough understanding of embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details.
Example 1
Group a ratio (by mass): 15 parts of flaky zinc powder, 5 parts of flaky aluminum powder, 14 parts of dipropylene glycol, 6 parts of ethanol, 4 parts of ethylene glycol, 4 parts of polyethylene glycol and 4 parts of passivating agent, wherein the passivating agent is preferably one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate, and the passivating agent is ensured to be 4 parts. The passivating agent mainly provides rare earth ions, the rare earth ions replace chromium ions to passivate zinc and aluminum powder, the temperature resistance of the coating is improved, and the obtained zinc-aluminum coating can bear the high temperature of 300 ℃ and still has long-acting anti-corrosion performance, and the neutral salt fog resistance time is improved by more than 1 time.
Group B ratio (by volume): 78 parts of tetraethyl orthosilicate, 29 parts of deionized water and 185 parts of ethanol.
The preparation process of the component A comprises the following steps: mixing the flaky zinc powder and aluminum powder, adding dipropylene glycol, ethanol and ethylene glycol, stirring at a high speed of 600rad/min by using an IKA stirring head of 4cm, and stirring for 2 hours. Polyethylene glycol and passivating agent were then added and stirring was continued for 2 hours.
The preparation process of the component B comprises the following steps: adjusting the pH value of deionized water to 1.3 by hydrochloric acid, and uniformly mixing with 50 parts of ethanol to obtain acid liquor; tetraethyl orthosilicate and 100 parts of ethanol are uniformly mixed, then acid liquor is added dropwise under the condition of magnetic stirring, the rest ethanol is added after the acid liquor is added, and the mixture is stirred uniformly and then aged in a 60 ℃ oven in a sealing way for 3 days. The organic silicon solution and the acid liquor are mixed and aged, the organic silicon is hydrolyzed and condensed, the partially hydrolyzed and condensed silicon alkoxide is obtained, and the film-forming component with high silicon content can be obtained, so that the finally prepared coating has high silicon content and is more resistant to high temperature.
Coating configuration: the components A and B are configured according to the mass ratio of 1:1.33.
Spraying and annealing: mixing to obtain spray solution, spraying onto standard steel plate (5×10cm) 2 ) Spraying a layer of coating, drying the coating at room temperature for 10min, heating to 310 ℃ at 10 ℃/min, treating for 10min, and naturally cooling.
The thickness of the obtained coating is 20 micrometers, and the neutral salt fog resistance of the coating is more than 900 hours after the coating is treated for 1 hour at 300 ℃.
Example 2
Group a ratio (by mass): 20 parts of flaky zinc powder, 5 parts of flaky aluminum powder, 18 parts of dipropylene glycol, 6 parts of ethanol, 4 parts of polyethylene glycol and 2 parts of passivating agent, wherein the passivating agent is preferably one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate, and the passivating agent is ensured to be 2 parts.
Group B ratio (by volume): 78 parts of tetraethyl orthosilicate, 29 parts of deionized water and 370 parts of solvent by volume.
The preparation process of the component A comprises the following steps: the flaky zinc powder and aluminum powder are mixed, dipropylene glycol and ethanol are added, IKA is adopted for high-speed stirring, a stirring head of 4cm is adopted, the stirring speed is 600rad/min, and stirring is carried out for 2 hours. Polyethylene glycol and passivating agent were then added and stirring was continued for 2 hours.
The preparation process of the component B comprises the following steps: adjusting the pH value of deionized water to 1.25 by hydrochloric acid, and uniformly mixing with 100 parts of ethanol to obtain acid liquor; tetraethyl orthosilicate and 200 parts of ethanol are uniformly mixed, then acid liquor is added dropwise under the condition of magnetic stirring, the rest ethanol is added after the acid liquor is added, and the mixture is stirred uniformly and then aged in a 60 ℃ oven in a sealing way for 3 days.
The mass ratio of the components A and B is 1:4.
Spraying and annealing: mixing uniformly to obtain spraying liquid, spraying on standard steelOn board (5X 10 cm) 2 ) Spraying a layer of coating, drying the coating at room temperature for 10min, heating to 330 ℃ at 20 ℃/min, treating for 1min, and naturally cooling.
The thickness of the obtained coating is 14 micrometers, and the neutral salt fog resistance is more than 650 hours after the coating is treated for 1 hour at 300 ℃.
Example 3
Group a ratio (by mass): 25 parts of flaky zinc powder, 5 parts of flaky aluminum powder, 18 parts of ethanol, 6 parts of methanol, 4 parts of polyethylene glycol and 4 parts of passivating agent, wherein the passivating agent is preferably one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate, and the passivating agent is ensured to be 4 parts.
Group B ratio (by volume): 78 parts of tetraethyl orthosilicate, 29 parts of deionized water, 640 parts of solvent, and the volume.
The preparation process of the component A comprises the following steps: mixing flake zinc powder and aluminum powder, adding methanol and ethanol, and stirring under defoaming (KURABO, model KK-250S, japan) at a speed ratio of 7-6 for 10min. Then polyethylene glycol and passivating agent are added, and the defoaming is continued for 10min.
The preparation process of the component B comprises the following steps: adjusting the pH value of deionized water to 1.1 by hydrochloric acid, and uniformly mixing with 200 parts of ethanol to obtain acid liquor; tetraethyl orthosilicate and 400 parts of ethanol are uniformly mixed, then acid liquor is added dropwise under the condition of magnetic stirring, the rest ethanol is added after the acid liquor is added, and the mixture is stirred uniformly and then aged in a 60 ℃ oven in a sealing way for 3 days.
The mass ratio of the components A and B is 1:10.
Spraying and annealing: mixing to obtain spray solution, spraying onto standard steel plate (5×10cm) 2 ) Spraying a layer of coating, drying the coating at room temperature for 10min, spraying a component B, heating to 340 ℃ at 100 ℃ per minute after drying, treating for 1min, and naturally cooling.
The total thickness of the obtained coating is 6 micrometers, and the neutral salt fog resistance of the coating is more than 350 hours after the coating is treated for 1 hour at 300 ℃.
Example 4
Group a ratio (by mass): 20 parts of flaky zinc powder, 5 parts of flaky aluminum powder, 18 parts of dipropylene glycol, 6 parts of methanol, 4 parts of polyethylene glycol and 4 parts of passivating agent, wherein the passivating agent is preferably one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate, and the passivating agent is ensured to be 4 parts.
Group B ratio (by volume): 78 parts of tetrabutyl orthosilicate, 29 parts of deionized water and 370 parts of solvent by volume.
The preparation process of the component A comprises the following steps: the flaky zinc powder and aluminum powder are mixed, dipropylene glycol and methanol are added, IKA is adopted for high-speed stirring, a stirring head of 4cm is adopted, the stirring speed is 600rad/min, and stirring is carried out for 2 hours. Polyethylene glycol and passivating agent were then added and stirring was continued for 2 hours.
The preparation process of the component B comprises the following steps: adjusting the pH value of deionized water to 1.1 by hydrochloric acid, and uniformly mixing with 100 parts of ethanol to obtain acid liquor; tetraethyl orthosilicate and 200 parts of ethanol are uniformly mixed, then acid liquor is added dropwise under the condition of magnetic stirring, the rest ethanol is added after the acid liquor is added, and the mixture is stirred uniformly and then aged in a baking oven at 70 ℃ in a sealing way for 5 days.
The mass ratio of the components A and B is 1:4
Spraying and annealing: mixing to obtain spray solution, spraying onto standard steel plate (5×10cm) 2 ) Spraying a layer of coating, drying the coating at room temperature for 10min, heating to 3420 ℃ at 10 ℃/min, treating for 10min, and naturally cooling.
The thickness of the obtained coating is 20 micrometers, and the neutral salt fog resistance is more than 900 hours after the coating is treated for 1 hour at 300 ℃.
Example 5
Group a ratio (by mass): 20 parts of flaky zinc powder, 5 parts of flaky aluminum powder, 18 parts of dipropylene glycol, 6 parts of ethanol, 4 parts of polyethylene glycol and 2 parts of passivating agent, wherein the passivating agent is preferably one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate, and the passivating agent is ensured to be 2 parts.
Group B ratio (by volume): 78 parts of tetraethyl orthosilicate, 29 parts of deionized water and 370 parts of solvent by volume.
The preparation process of the component A comprises the following steps: mixing flake zinc powder and aluminum powder, adding dipropylene glycol and ethanol, and stirring under defoaming (KURABO, model KK-250S, speed ratio of 7-6 for 10min. Then polyethylene glycol and passivating agent are added, and the defoaming is continued for 10min.
The preparation process of the component B comprises the following steps: adjusting the pH value of deionized water to 1.10 by hydrochloric acid, and uniformly mixing with 100 parts of ethanol to obtain acid liquor; tetraethyl orthosilicate and 200 parts of ethanol are uniformly mixed, then acid liquor is added dropwise under the condition of magnetic stirring, the rest ethanol is added after the acid liquor is added, and the mixture is stirred uniformly and then aged in a 60 ℃ oven in a sealing way for 3 days.
The components A and B are added with sodium cellulose as a thickening agent according to the mass ratio of 1:4, and the viscosity is regulated to 40 mPa' s
Spraying and annealing: mixing to obtain spray solution, spraying onto standard steel plate (5×10cm) 2 ) Spraying a layer of coating, drying the coating at room temperature for 10min, heating to 350 ℃ at 10 ℃/min, treating for 10min, and naturally cooling.
The thickness of the obtained coating is 30 micrometers, and the neutral salt fog resistance of the coating is more than 1000 hours after the coating is treated for 1 hour at 300 ℃.
Example 6
Group a ratio (by mass): 20 parts of flaky zinc powder, 5 parts of flaky aluminum powder, 18 parts of dipropylene glycol, 6 parts of ethanol, 4 parts of polyethylene glycol and 2 parts of passivating agent, wherein the passivating agent is preferably one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate, and the passivating agent is ensured to be 2 parts.
Group B ratio (by volume): 78 parts of isopropyl orthosilicate, 29 parts of deionized water and 370 parts of solvent by volume.
The preparation process of the component A comprises the following steps: the flaky zinc powder and aluminum powder are mixed, dipropylene glycol and ethanol are added, IKA is adopted for high-speed stirring, a stirring head of 4cm is adopted, the stirring speed is 600rad/min, and stirring is carried out for 2 hours. Polyethylene glycol and passivating agent were then added and stirring was continued for 2 hours.
The preparation process of the component B comprises the following steps: adjusting the pH value of deionized water to 1.10 by hydrochloric acid, and uniformly mixing with 100 parts of ethanol to obtain acid liquor; mixing isopropyl orthosilicate with 200 parts of ethanol uniformly, then adding acid liquor dropwise under the condition of magnetic stirring, adding the rest ethanol after the acid liquor is added, stirring uniformly, and hermetically aging for 5 days in a 70 ℃ oven.
The mass ratio of the components A and B is 1:4
Spraying and annealing: mixing to obtain spray solution, spraying onto standard steel plate (5×10cm) 2 ) Spraying a layer of coating, after the coating is dried for 10min at room temperature, spraying a component B, drying for 10min, heating to 330 ℃ at 20 ℃/min, treating for 10min, and naturally cooling.
The total thickness of the obtained coating is 20 micrometers, and the neutral salt fog resistance of the coating is more than 1000 hours after the coating is treated for 1 hour at 300 ℃.
Example 7
Group a ratio (by mass): 20 parts of flaky zinc powder, 5 parts of flaky aluminum powder, 18 parts of dipropylene glycol, 6 parts of ethanol and 2 parts of passivating agent, wherein the passivating agent is preferably one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate, and the passivating agent is ensured to be 2 parts.
Group B ratio (by volume): 78 parts of tetrapropyl orthosilicate, 29 parts of deionized water and 370 parts of solvent by volume.
The preparation process of the component A comprises the following steps: the flaky zinc powder and aluminum powder are mixed, dipropylene glycol and ethanol are added, IKA is adopted for high-speed stirring, a stirring head of 4cm is adopted, the stirring speed is 600rad/min, and stirring is carried out for 2 hours. Polyethylene glycol and passivating agent were then added and stirring was continued for 2 hours.
The preparation process of the component B comprises the following steps: adjusting the pH value of deionized water to 1.10 by hydrochloric acid, and uniformly mixing with 100 parts of ethanol to obtain acid liquor; mixing tetrapropyl orthosilicate with 200 parts of ethanol uniformly, then adding acid liquor dropwise under the condition of magnetic stirring, adding the rest ethanol after the acid liquor is added, stirring uniformly, and hermetically aging for 5 days in a 70 ℃ oven.
The mass ratio of the components A and B is 1:4
Spraying and annealing: mixing to obtain spray solution, spraying onto standard steel plate (5×10cm) 2 ) Spraying a layer of coating, drying the coating at room temperature for 10min, heating to 330 ℃ at 20 ℃/min, treating for 10min, and naturally cooling.
The thickness of the obtained coating is 22 micrometers, and the neutral salt fog resistance is more than 900 hours after the coating is treated for 1 hour at 300 ℃.
Comparative example 1:
jiemett JH310 anticorrosive paint with thickness of 15 microns is coated, and under the same technological conditions, the curing temperature is 320 ℃, and the neutral salt fog resistance is 256 hours after being treated for 1 hour at 300 ℃.
Comparative case 2:
the high temperature resistant acrylic acid modified phenolic epoxy resin has weight loss of less than 2% at 350 ℃, is cured for 10min at 200 ℃ after surface drying by adopting a spraying process, and has a coating thickness of 40 microns. The neutral salt fog resistance time is more than 800 hours after the treatment for 1 hour at 250 ℃; the treatment is carried out for 1h at 300 ℃ and the neutral salt fog resistant time is 48h.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (9)

1. The anticorrosive paint for the brake disc is characterized by comprising an A component and a B component, wherein the mass ratio of the A component to the B component is 1:1.33-1:10; wherein,
the component A comprises 20-30 parts of metal powder, 24 parts of solvent, 4 parts of dispersing agent and 2-4 parts of passivating agent;
the component B is a silicon-based polymer and comprises 78 parts of organic silicon, 29 parts of deionized water and 185-640 parts of solvent.
2. The anticorrosive paint for the brake disc as claimed in claim 1, wherein the metal powder in the component A is flaky zinc powder and aluminum powder, the mass ratio of the zinc powder to the aluminum powder is 3-7:1, the average size of the zinc powder and the aluminum powder is 20-40 microns, the solvent is one or more of ethanol, ethylene glycol and dipropylene glycol, the dispersing agent is polyethylene glycol, and the passivating agent is one or more of cerium nitrate, sodium molybdate, lanthanum nitrate and nickel nitrate.
3. The anticorrosive paint for brake discs as claimed in claim 2, wherein the preparation method of the component a comprises the following steps:
mixing the metal powder and the solvent, and stirring for a certain time;
adding the dispersing agent and the passivating agent, and continuing stirring for a certain time to obtain a final product.
4. The anticorrosive paint for brake discs as claimed in claim 1, wherein the organic silicon in the component B is one or more of isopropyl orthosilicate, tetrabutyl orthosilicate and tetrapropyl orthosilicate, and the solvent is one or more of ethanol, ethylene glycol and dipropylene glycol.
5. The anticorrosive paint for brake discs as claimed in claim 4, wherein the preparation method of the component B comprises the following steps:
adjusting the pH of deionized water to 1.1-1.3 by using acid, adding a solvent with the mass 2-5 times that of the solvent, and uniformly stirring to obtain acid liquor, wherein the acid is one of hydrochloric acid, nitric acid, acetic acid or sulfuric acid;
adding 1-2 times of solvent into the organic silicon, and uniformly stirring to obtain an organic silicon solution;
dropwise adding the acid liquor into the organic silicon liquor, and simultaneously keeping the liquor stirred;
adding the rest solvent, stirring, standing at 60-70deg.C, and aging for 3-5 days.
6. A method for preparing a brake disc coating with an anticorrosive paint according to any one of claims 1-5, comprising the steps of:
mixing the component A and the component B, and uniformly stirring to obtain a coating C;
according to the construction viscosity requirement, adding a solvent or a thickener to adjust the viscosity of the coating C;
preparing a coating by adopting a spraying process;
and (3) after the coating is dried at room temperature, annealing at a high temperature to obtain the coating.
7. A method for preparing a brake disc coating with an anticorrosive paint according to any one of claims 1-5, comprising the steps of:
mixing the component A and the component B, and uniformly stirring to obtain a coating C;
according to the construction viscosity requirement, adding a solvent or a thickener to adjust the viscosity of the coating C;
preparing a coating by adopting a spraying process, and obtaining a first coating after surface drying at 60-100 ℃;
preparing a coating on the surface of the first coating by adopting a spraying process and using a component B to obtain a second coating;
and after the second coating is dried at room temperature, annealing at a high temperature to obtain the final brake disc coating.
8. The method for producing a brake disc coating according to claim 6 or 7, wherein the thickener comprises polyethylene glycol and cellulose.
9. The method for preparing a brake disc coating according to claim 7, wherein the thickness of the first coating is 30 microns or less and the thickness of the second coating is 1 micron or less, the high-temperature annealing process comprises a heating rate, an annealing temperature and an annealing time, wherein the heating rate is 1-100 ℃/min, the annealing temperature is 300-350 ℃, and the annealing time is 10-30min.
CN202311388023.XA 2023-10-25 2023-10-25 Anticorrosive paint for brake disc and preparation method of brake disc coating Pending CN117447915A (en)

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CN202311388023.XA CN117447915A (en) 2023-10-25 2023-10-25 Anticorrosive paint for brake disc and preparation method of brake disc coating

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Application Number Priority Date Filing Date Title
CN202311388023.XA CN117447915A (en) 2023-10-25 2023-10-25 Anticorrosive paint for brake disc and preparation method of brake disc coating

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CN117447915A true CN117447915A (en) 2024-01-26

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