High-adhesion vibration-impact-resistant water-based anticorrosive paint for automobile shock absorber and preparation method thereof
By combining core-shell hybrid emulsions and specific fillers, the problem of insufficient adhesion of water-based anti-corrosion coatings under vibration and shock environments has been solved, resulting in coatings with high adhesion and corrosion resistance, which meet the long-term stable operation requirements of automotive shock absorbers.
Patent Information
- Application Number
- CN202511615214.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-06
- Publication Date
- 2026-01-23
AI Technical Summary
Existing water-based anti-corrosion coatings have difficulty maintaining high adhesion to automotive shock absorber substrates under complex vibration and impact environments, resulting in easy coating peeling and cracking, which cannot meet the requirements for long-term stable operation.
A core-shell hybrid emulsion (epoxy resin as the core and acrylate polymer as the shell) is combined with phosphate ester functional monomers, organic zirconate crosslinking agents and mica iron oxide/sericite flake fillers of specific particle size to form a dense and stable coating, which enhances adhesion and corrosion resistance through chemical and physical barriers.
It significantly improves the adhesion strength and vibration and shock resistance of the coating, extends its service life, and meets the protection requirements of automotive shock absorbers in complex environments.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of water-based anticorrosive coatings, in particular to a high-adhesion vibration-impact-resistant water-based anticorrosive coating for automobile shock absorbers and a preparation method thereof. BACKGROUND
[0002] With the rapid development of the automobile industry, the performance requirements of automobile parts, especially key moving parts such as shock absorbers, are becoming increasingly stringent. As a core component for ensuring the smoothness of vehicle driving and the comfort of passengers, the working environment of automobile shock absorbers is complex and changeable. They not only need to withstand high-frequency vibrations and instantaneous impacts, but also are often exposed to harsh weather and corrosive environments. Therefore, improving the corrosion resistance and adhesion strength of shock absorbers has become an important issue for prolonging their service life and ensuring driving safety. Water-based anticorrosive coatings have gradually become the preferred material for protecting automobile shock absorbers due to their environmental protection and low VOC emission. In recent years, water-based anticorrosive coating technology has made significant progress. By improving the resin base and adding functional additives, the comprehensive performance of the coating has been continuously improved to meet the demand for high-performance anticorrosive coatings in the automobile industry.
[0003] However, in the existing water-based anticorrosive coating technology, a prominent technical problem is how to simultaneously achieve high adhesion of the coating to the substrate and stability in a complex vibration and impact environment. Although traditional water-based coatings have corrosion resistance to some extent, they often fail to maintain the integrity and adhesion of the coating when facing high-frequency vibration and strong impact components such as automobile shock absorbers, leading to phenomena such as coating peeling and cracking in a short period of time, which further affects the protective effect and service life of the shock absorber. The coating film-forming material in the existing technology mainly uses a single resin system, which cannot balance the excellent adhesion and chemical resistance of epoxy resin with the flexibility and weather resistance of acrylate polymer. As a result, the bonding force between the coating and the substrate rapidly decreases in a vibration and impact environment, which cannot meet the demand for long-term stable operation of automobile shock absorbers. Therefore, improvements are needed. SUMMARY
[0004] The purpose of the present application is to provide a high-adhesion vibration-impact-resistant water-based anticorrosive coating for automobile shock absorbers and a preparation method thereof, to solve the problem of insufficient adhesion of water-based anticorrosive coatings in the prior art to automobile shock absorber substrates in a complex vibration and impact environment, leading to easy peeling and cracking of the coating, and failing to meet the demand for long-term stable operation.
[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a high-adhesion vibration-impact-resistant water-based anticorrosive coating for automobile shock absorbers, comprising the following components by weight: core-shell structure hybrid emulsion: 30-60 parts, phosphate functional monomer: 0.5-5 parts, organic zirconium ester crosslinking agent: 1-10 parts, pigment and filler: 15-35 parts, additives: 2-8 parts, and deionized water: 10-30 parts. The core layer of the core-shell structure hybrid emulsion is epoxy resin, and the shell layer is acrylate polymer.
[0006] Further, the phosphate functional monomer is one of phosphate methacrylate and phosphate ethyl acrylate.
[0007] Further, the organic zirconate crosslinking agent is one of ammonium zirconium carbonate and zirconium acetate.
[0008] Further, the pigment filler includes flaky filler, and the flaky filler is composed of mica iron oxide and sericite.
[0009] Further, the average particle size of the mica iron oxide is 10-50μm, and the average particle size of the sericite is 1-5μm.
[0010] Further, the weight ratio of the mica iron oxide to the sericite is (3-5):1.
[0011] Further, the auxiliary agent includes rheological auxiliary agent, and the rheological auxiliary agent is polyamide wax.
[0012] The preparation method of the high-adhesion vibration-impact-resistant water-based anticorrosive coating for automobile shock absorbers includes the following steps: S1, part of deionized water, part of core-shell structure hybrid emulsion, phosphate functional monomer, dispersant and defoaming agent are put into a dispersion cylinder and stirred uniformly at a speed of 300-500r / min; S2, the pigment filler is added to the mixture obtained in step S1, and high-speed dispersion is carried out at a speed of 800-1000r / min for 10-20 minutes, and then grinding is carried out to a fineness of ≤25μm to obtain slurry; S3, the remaining core-shell structure hybrid emulsion, organic zirconate crosslinking agent, rheological auxiliary agent and leveling agent are added to the slurry, and stirring is carried out at a speed of 400-600r / min for 15-25 minutes; S4, the remaining deionized water is added to adjust the viscosity, and the product is discharged after filtration.
[0013] Further, in step S2, the temperature during high-speed dispersion is controlled at 40-50℃.
[0014] Further, in step S3, the stirring speed is controlled at ≤600r / min.
[0015] Compared with the prior art, the high-adhesion vibration-impact-resistant water-based anticorrosive paint for automobile shock absorber and the preparation method thereof have the effects that the core-shell structure hybrid emulsion with the epoxy resin as the core and the acrylate polymer as the shell is used as the film-forming binder, the excellent adhesion and chemical resistance of the epoxy resin and the flexibility and weather resistance of the acrylate polymer are organically combined, the advantages of the resin performance are complemented, and the adhesion strength of the paint film to the base material and the comprehensive corrosion resistance are significantly improved.
[0016] By introducing the phosphate functional monomer, the phosphate groups in the molecular structure can strongly anchor the metal base material surface, and the vinyl groups participate in emulsion copolymerization and crosslinking with the system, and a firm chemical bond is constructed at the interface between the paint film and the base material, so that the adhesion of the coating is greatly improved, especially the adhesion stability under vibration impact environment.
[0017] By selecting the organic zirconium acid ester as the crosslinking agent and cooperating with the core-shell emulsion and the functional monomer, the polymer molecular chains are efficiently promoted to form a dense and stable three-dimensional network structure during the film-forming process, and the environmental protection and storage problems that may exist in traditional crosslinking agents are avoided, so that the crosslinking density, hardness, wear resistance and corrosion medium permeability of the paint film are significantly improved.
[0018] By using the mica iron oxide and sericite with specific particle size and compounding ratio as the flaky pigment filler system, the mica iron oxide and sericite are stacked in parallel to the base in the paint film, the penetration path of water, oxygen and other corrosion factors is effectively prolonged and blocked, and the chemical bonding effect is synergized, so that an efficient and long-acting physical shielding barrier is constructed, and the long-acting corrosion resistance of the coating is greatly improved. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.
[0020] Figure 1 The preparation flow chart provided by the embodiments of the present application. DETAILED DESCRIPTION
[0021] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail with reference to the drawings.
[0022] As shown in the accompanying Figure 1 drawings: Example 1
[0023] The application provides a high-attachment vibration-impact-resistant water-based anticorrosive paint for automobile shock absorbers and a preparation method thereof. core-shell structure hybrid emulsion: 30 parts, the core layer of the emulsion is epoxy resin, and the shell layer is acrylate polymer; phosphate functional monomer: 0.5 parts, phosphate methacrylate is used in this example; organic zirconate crosslinking agent: 1 part, ammonium zirconium carbonate is used in this example; pigment and filler: 15 parts, the pigment and filler used in this example include flaky fillers, which are compounded by mica iron oxide with an average particle size of 10 μm and sericite with an average particle size of 1 μm at a weight ratio of 3:1; auxiliary agent: 2 parts, the auxiliary agent includes polyamide wax (as a rheological auxiliary agent), dispersant, defoaming agent, leveling agent and other conventional auxiliary agents in the field, and is proportioned according to the conventional amount in the field; deionized water: 30 parts.
[0024] The preparation method comprises the following steps: premixing: 10 parts of deionized water, 10 parts of core-shell structure hybrid emulsion, 0.5 parts of phosphate methacrylate, 0.2 parts of dispersant and 0.1 parts of defoaming agent are put into a dispersion cylinder, and low-speed stirring is carried out at a rotating speed of 300 r / min for 5 minutes, so that they are uniformly mixed.
[0025] dispersion and grinding: 15 parts of pigment and filler (mica iron oxide and sericite compounded at a ratio of 3:1) are added to the mixture obtained in step 1, the rotating speed is increased to 800 r / min, and high-speed dispersion is carried out for 10 minutes. Then the dispersed slurry is transferred into a sand mill for grinding until the fineness is ≤25 μm, and a uniform slurry is prepared. The material temperature is controlled at 40℃ in this process.
[0026] paint adjustment: the remaining 20 parts of core-shell structure hybrid emulsion, 1 part of ammonium zirconium carbonate, 0.5 parts of polyamide wax, 0.3 parts of leveling agent and other auxiliary agents are added to the slurry prepared in step 2, and stirring is carried out at a rotating speed of 400 r / min for 15 minutes, so that they are fully mixed and uniform. The stirring rotating speed in this stage is not more than 600 r / min.
[0027] adjustment and discharge: the remaining deionized water is added to adjust the viscosity of the paint, and finally filtered through a 200-mesh filter screen and discharged for packaging.
[0028] The paint still forms a dense and stable paint film under a lower formula component, has excellent adhesion (0 level in the cross-hatch method test), moderate film hardness (H), and good vibration-impact resistance (5×10 6After the secondary vibration cycle, no peeling occurs, can effectively resist the mechanical stress in the working environment of automobile shock absorber, corrosion resistance meets the basic requirements (pass 480h neutral salt spray test), and shows good protection potential.
[0029] Example two:
[0030] The present application provides a high-attached vibration-impact-resistant water-based anticorrosive coating for automobile shock absorber and a preparation method thereof, and the raw material composition thereof is as follows in terms of weight parts: Core-shell structure hybrid emulsion: 45 parts, the core layer of the emulsion is epoxy resin, and the shell layer is acrylate polymer; Phosphate functional monomer: 2.5 parts, phosphate ethyl acrylate is used in this example; Organic zirconium acid ester crosslinking agent: 5 parts, zirconium ammonium acetate is used in this example; Color filler: 25 parts, the color filler used in this example comprises a flaky filler, which is compounded by mica iron oxide with an average particle size of 30 μm and sericite with an average particle size of 3 μm at a weight ratio of 4:1; Auxiliary agent: 5 parts, the auxiliary agent includes polyamide wax (as a rheological auxiliary agent), dispersant, defoaming agent, leveling agent and other conventional auxiliary agents in the field, and is proportioned according to the conventional amount in the field; Deionized water: 20 parts.
[0031] The preparation method comprises the following steps: Premixing: 8 parts of deionized water, 15 parts of core-shell structure hybrid emulsion, 2.5 parts of phosphate ethyl acrylate, 0.3 parts of dispersant and 0.2 parts of defoaming agent are put into a dispersion cylinder, and low-speed stirring is carried out at a speed of 400 r / min for 5 minutes, so that they are uniformly mixed.
[0032] Dispersion and grinding: 25 parts of color filler (mica iron oxide and sericite compounded at a ratio of 4:1) are added to the mixture obtained in step 1, the speed is increased to 900 r / min, and high-speed dispersion is carried out for 15 minutes. Then the dispersed slurry is transferred into a sand mill for grinding until the fineness is ≤25 μm, and a uniform slurry is prepared. The material temperature is controlled at 45°C during this process.
[0033] Paint adjustment: 30 parts of the remaining core-shell structure hybrid emulsion, 5 parts of zirconium ammonium acetate, 1 part of polyamide wax, 0.5 parts of leveling agent and other auxiliary agents are added to the slurry prepared in step 2, and stirring is carried out at a speed of 500 r / min for 20 minutes, so that they are fully mixed and uniform. The stirring speed in this stage is not more than 600 r / min.
[0034] Adjustment and discharge: the remaining deionized water is added to adjust the viscosity of the coating, and finally filtered through a 200-mesh filter screen and discharged for packaging.
[0035] The paint forms a more compact and tough paint film under the medium level of formula components, has excellent adhesion (0 level in cross-hatch test), moderate to high hardness (2H), shows excellent vibration impact resistance (no peeling after 1x10 7 cycles of vibration), can effectively adapt to the vibration and impact of automobile shock absorbers under complex working conditions, has significantly improved corrosion resistance (passes 720h neutral salt spray test), and exhibits excellent protection effect.
[0036] Example Three
[0037] The present application provides a high-adhesion vibration-impact-resistant water-based anticorrosive paint for automobile shock absorbers and a preparation method thereof, and the raw material composition thereof is as follows in terms of weight parts: core-shell structure hybrid emulsion: 60 parts, the core layer of the emulsion is epoxy resin, and the shell layer is acrylate polymer; phosphate functional monomer: 5 parts, phosphate methacrylate is used in this example; organic zirconium acid ester crosslinking agent: 10 parts, ammonium zirconium carbonate is used in this example; pigment and filler: 35 parts, the pigment and filler used in this example include a flaky filler, which is compounded by mica iron oxide with an average particle size of 50 μm and sericite with an average particle size of 5 μm at a weight ratio of 5:1; auxiliary agent: 8 parts, the auxiliary agent includes polyamide wax (as a rheological auxiliary agent), dispersant, defoaming agent, leveling agent and other conventional auxiliary agents in the field, and is proportioned according to the conventional amount in the field; deionized water: 10 parts.
[0038] The preparation method comprises the following steps: premixing: 5 parts of deionized water, 20 parts of core-shell structure hybrid emulsion, 5 parts of phosphate methacrylate, 0.5 parts of dispersant and 0.3 parts of defoaming agent are put into a dispersion cylinder, and low-speed stirring is carried out at a speed of 500 r / min for 5 minutes, so that they are uniformly mixed.
[0039] dispersion and grinding: 35 parts of pigment and filler (mica iron oxide and sericite compounded at a ratio of 5:1) are added to the mixture obtained in step 1, the speed is increased to 1000 r / min, and high-speed dispersion is carried out for 20 minutes. Then the dispersed slurry is transferred into a sand mill for grinding until the fineness is ≤25 μm, and a uniform slurry is prepared. The material temperature is controlled at 50℃ during this process.
[0040] paint adjustment: the remaining 40 parts of core-shell structure hybrid emulsion, 10 parts of ammonium zirconium carbonate, 1.5 parts of polyamide wax, 0.8 parts of leveling agent and other auxiliary agents are added to the slurry prepared in step 2, and stirring is carried out at a speed of 600 r / min for 25 minutes, so that they are fully mixed and uniform. The stirring speed in this stage is controlled to be not more than 600 r / min.
[0041] Adjustment and discharge: add the remaining deionized water to adjust the viscosity of the paint, and finally filter through a 200 mesh filter screen and discharge for packaging.
[0042] The paint forms an extremely dense, tough and complete paint film under the high ratio of the formula, with optimal adhesion (0 level in the cross-hatch test), high film hardness (3H), and excellent resistance to vibration impact (no peeling after 2x10 7 cycles of vibration), fully meeting the long-term vibration and impact requirements of automobile shock absorbers under extremely harsh working conditions, with excellent corrosion resistance (passing 1000h neutral salt spray test) and showing top-level long-term protection effect.
[0043] Comparative example: The example provides a conventional water-based anticorrosive paint for automobile shock absorbers and a preparation method thereof, and the raw material composition is as follows in terms of weight parts: Conventional acrylic emulsion: 50 parts (a common single-structure acrylic emulsion without core-shell hybrid structure); Phosphate functional monomer: 0 parts (no such functional monomer is added); Conventional aziridine crosslinking agent: 3 parts (a conventional crosslinking agent for water-based paint); Color filler: 20 parts (composed of 15 parts of conventional rutile titanium dioxide and 5 parts of precipitated barium sulfate, without flaky mica iron oxide and sericite); Auxiliary agent: 4 parts (including conventional dispersant, defoaming agent, leveling agent, etc., rheological auxiliary agent is hydroxyethyl cellulose, non-polyamide wax); Deionized water: 23 parts.
[0044] The preparation method comprises the following steps: Part of the deionized water, all the conventional acrylic emulsion, the dispersant and the defoaming agent are put into a dispersion cylinder and stirred uniformly at a speed of 400 r / min.
[0045] The color filler (titanium dioxide and barium sulfate) is added to the mixture obtained in step 1, and high-speed dispersion is carried out at a speed of 800 r / min for 15 minutes, and then grinding is carried out to a fineness of ≤30μm.
[0046] The conventional aziridine crosslinking agent, the leveling agent and the rheological auxiliary agent (hydroxyethyl cellulose) are added to the slurry prepared in step 2, and stirring is carried out at a speed of 400 r / min for 15 minutes.
[0047] The remaining deionized water is added to adjust the viscosity, and the paint is discharged after filtration.
[0048] Performance comparison table:
[0049] From the comparison of the data in the above table, it can be seen that the coating provided by the embodiments one, two and three of the present application, on the basis of the comparative example (prior art), by using the core-shell structure hybrid emulsion, phosphate functional monomer, organic zirconium acid ester crosslinking agent and specific particle size and ratio of flaky mica iron oxide / schist mica pigment and filler system, and optimizing the preparation process, the key performance indicators of the coating, such as adhesion, corrosion resistance (neutral salt spray test), vibration impact resistance, paint film hardness and storage stability, are all significantly and continuously improved. The performances of the three embodiments are all obviously better than the comparative example representing the prior art, fully proving the effectiveness and advancement of the technical solution of the present application, and being able to meet the growing demand of high-performance water-based anticorrosive coating for automobile shock absorbers. The performance level is gradually improved with the increase of the formula component (low, medium and high), providing users with different levels of performance selection.
[0050] The foregoing merely illustrates some exemplary embodiments of the present application by way of description, and it is needless to say that, for those skilled in the art, the described embodiments can be modified in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature, and should not be understood as limiting the scope of protection of the claims of the present application.
Claims
1. A high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers, characterized in that: By weight, it includes the following components: Core-shell hybrid emulsion: 30-60 parts, phosphate ester functional monomer: 0.5-5 parts, organozirconate crosslinking agent: 1-10 parts, pigments and fillers: 15-35 parts, auxiliaries: 2-8 parts, and deionized water: 10-30 parts; The core-shell hybrid emulsion has an epoxy resin core and an acrylate polymer shell.
2. The high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 1, characterized in that, The phosphate ester functional monomer is one of phosphate ester methacrylate and phosphate ester ethyl acrylate.
3. The high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 1, characterized in that, The organozirconate crosslinking agent is one of ammonium zirconium carbonate and ammonium zirconium acetate.
4. The high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 1, characterized in that, The pigments and fillers include sheet-like fillers, which are composed of mica iron oxide and sericite.
5. The high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 1, characterized in that, The average particle size of the mica iron oxide is 10-50 μm, and the average particle size of the sericite is 1-5 μm.
6. The high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 1, characterized in that, The weight ratio of mica iron oxide to sericite is (3-5):
1.
7. The high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 1, characterized in that, The additives include rheology modifiers, which are polyamide waxes.
8. A method for preparing a high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers, applicable to the high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Add a portion of deionized water, a portion of core-shell hybrid emulsion, phosphate ester functional monomers, dispersant and defoamer to a dispersion tank and stir evenly at a speed of 300-500 r / min. S2. Add pigments and fillers to the mixture obtained in step S1, disperse at high speed of 800-1000 r / min for 10-20 minutes, and then grind until the fineness is ≤25μm to obtain a slurry. S3. Add the remaining core-shell hybrid emulsion, organozirconium ester crosslinking agent, rheology modifier and leveling agent to the slurry, and stir at 400-600 r / min for 15-25 minutes. S4. Add the remaining deionized water to adjust the viscosity, filter, and then discharge.
9. The preparation method of the high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 8, characterized in that, In step S2, the temperature during high-speed dispersion is controlled at 40-50℃.
10. The preparation method of the high-adhesion, vibration- and shock-resistant water-based anti-corrosion coating for automotive shock absorbers according to claim 8, characterized in that, In step S3, the stirring speed is controlled at ≤600 r / min.