A rust construction capable anticorrosive coating and a preparation method thereof

Abstract

The present application relates to the technical field of anticorrosive paint, in particular to a kind of anticorrosive paint and preparation method thereof, which can be rusted construction, and preparation raw materials thereof include, by weight parts: modified polysiloxane resin A: 15-20 parts: 30-35 parts;Modified polysiloxane active diluent: 2-5 parts;Silane coupling agent composition: 3.2-5 parts, the silane coupling agent composition includes epoxy group-containing silane coupling agent, double amino-containing silane coupling agent and amino polymer silane;Filler: 35-45 parts;Catalyst: 0.2-0.5 parts;Water remover: 1-3 parts;Ultraviolet stabilizer: 0.5-1.5 parts, including hindered amine light stabilizer and ultraviolet absorber;Thixotropic agent: 0.1-0.5 parts;Defoaming agent: 0.3-0.8 parts;Plasticizer: 0-5 parts.The product does not need complex derusting operation, and only needs simple treatment to carry out construction, and bonding performance is good, and construction is more simple.

Description

Technical Field

[0001] This invention relates to the field of anti-corrosion coating technology, specifically to an anti-corrosion coating that can be applied to areas with rust and its preparation method. Background Technology

[0002] The application of traditional anti-corrosion coatings generally requires strict rust removal procedures, such as grinding and applying rust-removing paint, making the process complex. While traditional polysiloxane (such as pure silicone) coatings possess excellent weather resistance and hydrophobicity, they often struggle to simultaneously maintain adhesion to substrates (especially metal substrates), mechanical strength, and elasticity. Existing modified polysiloxane coatings often have shortcomings in one or more properties, sacrificing elongation at break in pursuit of high hardness, or compromising deep curing and final adhesion in pursuit of fast drying. Chinese patent (authorization announcement number CN102690558B) discloses a preparation process for a rust-resistant heavy-duty anti-corrosion coating, primarily using a composite resin coating combining EPDM resin and polyurethane to improve the coating's permeability. Chinese patent application (publication number CN117701212A) discloses a preparation process for a rust-resistant heavy-duty anti-corrosion coating. It mainly utilizes a composite resin of EPDM resin and polyurethane and hyperbranched polymers to improve the product's permeability, thereby achieving rust and corrosion prevention on rust layers. To improve adhesion, existing technologies often require the addition of various plasticizers or tackifying resins, but this can lead to decreased weather resistance and precipitation after long-term use. Furthermore, the surface drying time, deep curing speed, and application properties (such as thixotropy) of the coating cannot be effectively balanced. Summary of the Invention

[0003] This invention provides an anti-corrosion coating that can be applied to rusted surfaces and its preparation method. By optimizing the selection and combination of raw materials in the system, the product can be applied without complicated rust removal operations. Only dust, loose material, oil stains, etc. on the substrate need to be removed before application. It also has good adhesion performance and is easier to apply.

[0004] This invention provides an anti-corrosion coating that can be applied to areas with rust, wherein the raw materials for its preparation, by weight, include: Modified polysiloxane resin A: 15-20 parts, wherein the viscosity of the modified polysiloxane resin A at 25°C is 3000-10000 mPa·s; Modified polysiloxane resin B: 30-35 parts, wherein the viscosity of the modified polysiloxane resin B at 25°C is 200-2000 mPa·s; Modified polysiloxane reactive diluent: 2-5 parts; Silane coupling agent composition: 3.2-5 parts, wherein the silane coupling agent composition includes epoxy-containing silane coupling agents, diamino-containing silane coupling agents, and amino polymer silanes; Filler: 35-45 parts; Catalyst: 0.2-0.5 parts; Dehydrating agent: 1-3 parts; UV stabilizer: 0.5-1.5 parts, including hindered amine light stabilizer and UV absorber; Thixotropic agent: 0.1-0.5 parts; Defoamer: 0.3-0.8 parts; Plasticizer: 0-5 parts.

[0005] Traditional anti-corrosion coatings generally require strict rust removal during application, and existing coatings cannot effectively balance comprehensive performance such as adhesion, mechanical properties, and weather resistance. This invention introduces modified polysiloxane resin A and modified polysiloxane resin B in combination with a modified polysiloxane reactive diluent and a silane coupling agent composition including epoxy-containing silane coupling agents, diamino-containing silane coupling agents, and amino polymer silanes. This results in a product that simultaneously possesses excellent adhesion to rusted surfaces, mechanical properties, weather resistance, chemical resistance, and curing performance, better meeting practical application needs. The inventors believe the reason for this is that modified polysiloxane resin A and modified polysiloxane resin B interpenetrate and synergistically crosslink during curing, forming a microstructure similar to an "island structure" or "interpenetrating network." Rigid domains act as reinforcing points dispersed within the flexible continuous phase, thus achieving a "flexible exterior, rigid interior" mechanical property: the surface has sufficient elasticity to buffer impact and deformation, while the interior maintains high strength and high modulus to resist stress. Furthermore, through interfacial coupling of a modified polysiloxane reactive diluent and a silane coupling agent composition, chemical anchoring and stress buffering are achieved, jointly resulting in high adhesion and excellent durability when applied to rusted surfaces.

[0006] In one embodiment, the modified polysiloxane resin A has a viscosity of 3000-7000 mPa·s at 25°C and is of type Plihenghe HP301 or Plihenghe HP516.

[0007] In one embodiment, the modified polysiloxane resin B has a viscosity of 400-800 mPa·s at 25°C and is designated as PolyHydrogen HP525.

[0008] Specifically, this invention employs specific modified polysiloxane resin A and modified polysiloxane resin B, further controlling the addition amount of the two resins. This ensures that the coating film has sufficient adhesion, water resistance, hardness, and tensile strength, while also giving it good flexibility and moderate elongation at break, avoiding the brittleness caused by high hardness or the insufficient strength caused by high elasticity.

[0009] In one embodiment, the modified polysiloxane reactive diluent is designated as Prihenghe PD200.

[0010] In one embodiment, the mass ratio of the epoxy-containing silane coupling agent, the diamino-containing silane coupling agent, and the amino polymer silane is 1-1.5:1-2:0.5-1.

[0011] In one embodiment, the epoxy-containing silane coupling agent comprises γ-glycidoxypropyltrimethoxysilane.

[0012] In one embodiment, the silane coupling agent containing diamino groups comprises N-β-aminoethyl-γ-aminopropyltrimethoxysilane.

[0013] In one embodiment, the amino polymer silane is designated as Jianghan JH-AP1231.

[0014] This invention introduces an epoxy-containing silane coupling agent, a diamino-containing silane coupling agent, and an amino polymer silane, controlling their mass ratio to be 1-1.5:1-2:0.5-1. Through the combined effects of chemical bonding, catalytic acceleration, and structural reinforcement, a strong chemical bond and physical anchoring are formed between the resin system and various substrates, improving the adhesion of the product to rusted surfaces and giving the product a reasonable surface drying time.

[0015] In one embodiment, the filler comprises silicon micropowder with a particle size of 1250-3000 mesh.

[0016] In one embodiment, the silicon micropowder has a particle size of 2000 mesh and is of type GS2000, sourced from Jiangxi Guangyuan Chemical Co., Ltd.

[0017] Based on the resin system of the present invention, by introducing silica micropowder with a particle size of 1250-3000 mesh, a dense physical barrier is formed to block the penetration of corrosive media, thereby ensuring the adhesion, mechanical properties and acid resistance of the product.

[0018] In one embodiment, the dehydrating agent comprises vinyltrimethoxysilane.

[0019] In one embodiment, the hindered amine light stabilizer comprises bis(2,2,6,6-tetramethylpiperidinol ester).

[0020] In one embodiment, the ultraviolet absorber comprises 2-(3,5-di-tert-pentyl-2-hydroxyphenyl)benzotriazole.

[0021] This invention uses a compounded modified polysiloxane resin A and modified polysiloxane resin B as the main resins, and introduces bis(2,2,6,6-tetramethylpiperidinol ester) and 2-(3,5-di-tert-pentyl-2-hydroxyphenyl)benzotriazole to synergistically block ultraviolet rays from damaging the resin, so that the provided product has excellent weather resistance and chemical resistance.

[0022] In one embodiment, the catalyst comprises an organotin catalyst.

[0023] In one embodiment, the organotin catalyst comprises dibutyltin dilaurate.

[0024] In one embodiment, the defoamer includes a silicone defoamer.

[0025] In one embodiment, the silicone defoamer is designated as BETTERSOL 4100 by Canghong Industrial.

[0026] In one embodiment, the thixotropic agent comprises a polyamide wax, the polyamide wax being of the Arkema SLT type.

[0027] In one embodiment, the ester plasticizer comprises diisononyl cyclohexane 1,2-dicarboxylate.

[0028] Another aspect of the present invention provides a method for preparing an anti-corrosion coating that can be applied to areas with rust, comprising the following steps: The modified polysiloxane resin A, modified polysiloxane resin B, dehydrating agent, ultraviolet stabilizer, epoxy-containing silane coupling agent, thixotropic agent, modified polysiloxane reactive diluent and plasticizer are stirred and dispersed to obtain mixture 1; Add filler to mixture 1 and perform vacuum dispersion to obtain mixture 2; After adding a catalyst, a silane coupling agent containing diamino groups, an amino polymer silane, and an antifoaming agent to mixture 2, vacuum stirring is performed, and the mixture is filled after passing the test.

[0029] In one embodiment, the stirring and dispersion conditions include: a wall scraping speed of 40-50 rpm, a dispersion disc speed of 200-300 rpm, and a time of 10-30 min.

[0030] In one embodiment, the vacuum dispersion conditions include: a wall scraping speed of 80-100 rpm, a dispersion disc speed of 800-1000 rpm, a time of 30-60 min, a temperature of 30-80℃, and a vacuum pressure of -0.1 MPa to -0.09 MPa.

[0031] In one embodiment, the vacuum stirring conditions include: a wall scraping speed of 60-70 rpm, a dispersion disc speed of 500-600 rpm, a time of 10-30 min, a temperature of 20-30℃, and a vacuum pressure of <-0.09 MPa.

[0032] Beneficial effects 1. This invention provides an anti-corrosion coating that can be applied to rusted surfaces and its preparation method. By optimizing the selection and combination of raw materials in the system, the product can be applied without complicated rust removal operations. Only dust, loose material, oil stains, etc. on the substrate need to be removed before application. It also has good adhesion performance and is easier to apply.

[0033] 2. This invention introduces modified polysiloxane resin A and modified polysiloxane resin B in combination with modified polysiloxane reactive diluent and a silane coupling agent composition including epoxy-containing silane coupling agent, diamino-containing silane coupling agent and amino polymer silane, so that the provided product has excellent adhesion to rust-covered surfaces, mechanical properties, weather resistance, chemical resistance and curing performance, better meeting the needs of practical applications.

[0034] 3. By using specific modified polysiloxane resin A and modified polysiloxane resin B, the present invention further controls the addition amount of the two resins, which not only ensures that the coating film has sufficient adhesion, water resistance, hardness and tensile strength, but also endows it with good flexibility and moderate elongation at break, avoiding the brittleness caused by high hardness or the insufficient strength caused by high elasticity.

[0035] 4. This invention introduces an epoxy-containing silane coupling agent, a diamino-containing silane coupling agent, and an amino polymer silane simultaneously, controlling their mass ratio to be 1-1.5:1-2:0.5-1. Through the combined effects of chemical bonding, catalytic acceleration, and structural reinforcement, a strong chemical bond and physical anchoring are formed between the resin system and various substrates, improving the adhesion of the product to rusted surfaces and giving the product a reasonable surface drying time.

[0036] 5. Based on the resin system of the present invention, by introducing silica micro powder with a particle size of 1250-3000 mesh, a dense physical barrier is formed to block the penetration of corrosive media, thereby ensuring the adhesion, mechanical properties and acid resistance of the product. Detailed Implementation

[0037] The types of raw materials used in Examples 1-3 and Comparative Examples 1-14 of this invention are shown in Table 1.

[0038] Table 1

[0039] Examples 1-3, Comparative Examples 1-14 Examples 1-3 and Comparative Examples 1-14 of the present invention provide an anti-corrosion coating that can be applied to areas with rust. The formulation by weight is shown in Tables 2 and 3.

[0040] Table 2

[0041] Table 3

[0042] Examples 1-3 and Comparative Examples 1-14 of the present invention, on the other hand, provide a method for preparing an anti-corrosion coating that can be applied to areas with rust, comprising the following steps: The modified polysiloxane resin A, modified polysiloxane resin B, dehydrating agent, ultraviolet stabilizer, epoxy-containing silane coupling agent, thixotropic agent, modified polysiloxane reactive diluent and plasticizer are stirred and dispersed to obtain mixture 1; Add filler to mixture 1 and perform vacuum dispersion to obtain mixture 2; After adding a catalyst, a silane coupling agent containing two amino groups, an amino polymer silane, γ-methacryloyloxypropyltrimethoxysilane, and a defoamer to mixture 2, vacuum stirring is performed, and the mixture is filled after passing the test.

[0043] The stirring and dispersion conditions include: a wall scraping speed of 50 rpm, a dispersion disc speed of 300 rpm, and a time of 10 min.

[0044] The conditions for vacuum dispersion include: a wall scraping speed of 100 rpm, a dispersion disc speed of 800 rpm, a time of 30 min, a temperature of 50 °C, and a vacuum pressure of -0.1 MPa.

[0045] The conditions for vacuum stirring include: wall scraping speed of 70 rpm, dispersion disk speed of 500 rpm, time of 10 min, temperature of 25℃, and vacuum pressure of -0.1 MPa.

[0046] Performance testing methods The products provided in each embodiment and comparative example of this application were subjected to the tests shown in Table 4. The test results are shown in Tables 5 and 6.

[0047] Table 4

[0048] Table 5

[0049] Table 6

[0050] Analysis of the data in Tables 5 and 6 shows that the products provided in Examples 1-3 have better overall performance than those in Comparative Examples 1-14, and better meet the needs of practical applications.

Claims

1. An anti-corrosion coating that can be applied to areas with rust, characterized in that, The raw materials for its preparation, by weight, include: Modified polysiloxane resin A: 15-20 parts, wherein the viscosity of the modified polysiloxane resin A at 25°C is 3000-10000 mPa·s; Modified polysiloxane resin B: 30-35 parts, wherein the viscosity of the modified polysiloxane resin B at 25°C is 200-2000 mPa·s; Modified polysiloxane reactive diluent: 2-5 parts; Silane coupling agent composition: 3.2-5 parts, wherein the silane coupling agent composition includes epoxy-containing silane coupling agents, diamino-containing silane coupling agents, and amino polymer silanes; Filler: 35-45 parts; Catalyst: 0.2-0.5 parts; Dehydrating agent: 1-3 parts; UV stabilizer: 0.5-1.5 parts, including hindered amine light stabilizer and UV absorber; Thixotropic agent: 0.1-0.5 parts; Defoamer: 0.3-0.8 parts; Plasticizer: 0-5 parts.

2. The anti-corrosion coating according to claim 1, characterized in that, The mass ratio of the epoxy-containing silane coupling agent, the diamino-containing silane coupling agent, and the amino polymer silane is 1-1.5:1-2:0.5-1.

3. The anti-corrosion coating according to claim 2, characterized in that, The epoxy-containing silane coupling agent includes γ-glycidoxypropyltrimethoxysilane, and the diamino-containing silane coupling agent includes N-β-aminoethyl-γ-aminopropyltrimethoxysilane.

4. The anti-corrosion coating according to claim 1, characterized in that, The filler includes silicon micro powder with a particle size of 1250-3000 mesh.

5. The anti-corrosion coating according to claim 1, characterized in that, The dehydrating agent includes vinyltrimethoxysilane.

6. The anti-corrosion coating according to claim 1, characterized in that, The hindered amine light stabilizer includes bis(2,2,6,6-tetramethylpiperidinol ester).

7. The anti-corrosion coating according to claim 1, characterized in that, The ultraviolet absorber includes 2-(3,5-di-tert-pentyl-2-hydroxyphenyl)benzotriazole.

8. The anti-corrosion coating according to claim 1, characterized in that, The catalyst includes organotin catalysts.

9. The anti-corrosion coating according to claim 1, characterized in that, The defoamer includes silicone defoamers.

10. A method for preparing an anti-corrosion coating according to any one of claims 1-9, characterized in that, At least the following steps are included: The modified polysiloxane resin A, modified polysiloxane resin B, dehydrating agent, ultraviolet stabilizer, epoxy-containing silane coupling agent, thixotropic agent, modified polysiloxane reactive diluent and plasticizer are stirred and dispersed to obtain mixture 1; Add filler to mixture 1 and perform vacuum dispersion to obtain mixture 2; After adding a catalyst, a silane coupling agent containing diamino groups, an amino polymer silane, and an antifoaming agent to mixture 2, vacuum stirring is performed, and the mixture is filled after passing the test.

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