High-quality steel anticorrosive paint and preparation method thereof

Abstract

The invention relates to a high-quality steel anticorrosive paint and a preparation method thereof, and belongs to the technical field of anticorrosive paints.The anticorrosive paint comprises a component A and a component B. The component A comprises, by weight, 40-50 parts of epoxy resin, 10-15 parts of epoxy propane phenyl ether, 6-9 parts of aluminum triphosphate, 4-6 parts of mica iron oxide, 2-3 parts of potassium phytate and 20-30 parts of calcium silicate. 2-3 parts of an auxiliary agent; and the component B comprises the following components in parts by weight: 100 parts of a polyamide curing agent. The anti-corrosion coating is a two-component normal-temperature curing system, epoxy resin is adopted as a film-forming agent, and a layer of compact cross-linked network structure can be formed during curing, so that a good shielding effect is achieved, and the anti-corrosion coating is environmentally friendly, high in adhesive force, good in medium resistance and excellent in anti-corrosion performance.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-corrosion coatings and relates to a high-quality steel anti-corrosion coating and a preparation method thereof. Background Art

[0002] Steel is currently the most widely used and most used engineering structural material, but it is also prone to corrosion, and the losses caused by steel corrosion are huge every year. Rust is a complex iron-based compound. The rust layer of steel can be specifically divided into an inner rust layer and an outer rust layer. The inner rust layer is tightly bound and highly active. It is a relatively strong rust layer and is also the main reason for the continuous corrosion of steel. The outer rust layer is a loose and porous water-containing floating rust layer. Although the structure is relatively stable, it cannot inhibit the development of rust to the inside due to its loose and porous structure.

[0003] Anti-corrosion coatings are the most important means of anti-corrosion for steel, especially for steel structures that require extremely long service cycles, such as cross-sea bridges, offshore platforms, ocean-going ships, etc., it is necessary to ensure the anti-corrosion effect of the project. Summary of the invention

[0004] The present invention aims to provide a high-quality steel anti-corrosion coating and a preparation method thereof. The high-quality steel anti-corrosion coating is environmentally friendly, has high adhesion, good medium resistance and excellent anti-corrosion performance.

[0005] The technical solution adopted by the present invention to achieve its purpose is as follows:

[0006] A high-quality steel anticorrosive coating comprises a component A and a component B, wherein the component A comprises, by weight, 40-50 parts of epoxy resin, 10-15 parts of propylene oxide phenyl ether, 6-9 parts of aluminum tripolyphosphate, 4-6 parts of micaceous iron oxide, 2-3 parts of potassium phytate, 20-30 parts of calcium silicate, and 2-3 parts of an auxiliary agent; and the component B comprises, by weight, 100 parts of a polyamide curing agent.

[0007] Preferably, the mass ratio of aluminum tripolyphosphate, mica iron oxide and potassium phytate is 3:2:1.

[0008] Preferably, the epoxy resin is a bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100g.

[0009] Preferably, the particle sizes of aluminum tripolyphosphate, mica iron oxide and calcium silicate are all controlled to be 200-300 meshes.

[0010] Preferably, the auxiliary agent is one or any combination of a dispersant, a leveling agent, a wetting agent, a defoaming agent, and a coupling agent.

[0011] Preferably, the mass ratio of component A to component B is (4-7):1.

[0012] A method for preparing a high-quality steel anticorrosion coating comprises the following steps:

[0013] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives are placed in a blender, stirred evenly, and then ground on a ball mill, passed through a 300 mesh sieve, to obtain component A;

[0014] S2. Prepare component B polyamide curing agent;

[0015] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0016] Preferably, in step S1, the stirring speed is 800 r / min-1000 r / min, and the stirring time is 40-50 min.

[0017] The beneficial effects of the present invention are:

[0018] The anticorrosive coating of the present invention is a two-component room temperature curing system, using epoxy resin as a film-forming agent, and can form a layer of dense cross-linked network structure during curing, thereby playing a good shielding role. By adding propylene oxide phenyl ether, the viscosity of the coating can be reduced, thereby further improving the workability and permeability of the coating. By adding aluminum tripolyphosphate, micaceous iron oxide and potassium phytate, a composite rust stabilizer and rust preventer is formed, and the hydrolysis of aluminum tripolyphosphate can dissociate tripolyphosphate ions, which can form a relatively stable chelate with iron; the orthophosphate ions formed by further hydrolysis of tripolyphosphate ions have a strong binding effect with iron ions; however, the single aluminum tripolyphosphate rust stabilizer and rust preventer have a general effect, and by compounding with micaceous iron oxide and potassium phytate, the rust stabilizer and rust preventer can be improved, for example, chelating with rust, increasing the density of the rust layer, and improving the adhesion of the coating, thereby further improving the shielding effect of the coating. Calcium silicate, as a filler, cooperates with aluminum tripolyphosphate and micaceous iron oxide to improve the stability of the system. The polyamide curing agent has good miscibility with epoxy resin, fast curing speed at room temperature, can improve the permeability of the coating, and is not easy to volatilize.

[0019] Bisphenol A epoxy resin (E51) with an epoxy value of 0.51-0.54eq / 100g is used. It has low viscosity and is easy to apply, which can improve the permeability of the coating to high-quality steel. DETAILED DESCRIPTION 1. Specific embodiments

[0021] Example 1

[0022] A high-quality steel anticorrosion coating, comprising component A and component B, wherein:

[0023] Component A includes, by weight, 45 parts of bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100g, 12 parts of propylene oxide phenyl ether, 7.5 parts of aluminum tripolyphosphate, 5 parts of mica iron oxide, 2.5 parts of potassium phytate, 25 parts of calcium silicate, 2.5 parts of KH550, and 0.5 parts of BYK180;

[0024] Component B includes 100 parts of polyamide curing agent by weight.

[0025] The mass ratio of component A to component B is 5:1.

[0026] The above-mentioned high-quality steel anticorrosive coating is prepared by the following method:

[0027] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives were placed in a mixer at a stirring speed of 900 r / min for 45 min, stirred evenly, and then ground on a ball mill and passed through a 300 mesh sieve to obtain component A;

[0028] S2. Prepare component B polyamide curing agent;

[0029] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0030] Example 2

[0031] A high-quality steel anticorrosion coating, comprising component A and component B, wherein:

[0032] Component A includes, by weight, 40 parts of bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100g, 10 parts of propylene oxide phenyl ether, 9 parts of aluminum tripolyphosphate, 6 parts of mica iron oxide, 3 parts of potassium phytate, 30 parts of calcium silicate, 1 part of silicone oil, and 1 part of BYK110;

[0033] Component B includes 100 parts of polyamide curing agent by weight.

[0034] The mass ratio of component A to component B is 4:1.

[0035] The above-mentioned high-quality steel anticorrosive coating is prepared by the following method:

[0036] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives were placed in a mixer at a stirring speed of 800 r / min for 50 min, stirred evenly, and then ground on a ball mill and passed through a 300 mesh sieve to obtain component A;

[0037] S2. Prepare component B polyamide curing agent;

[0038] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0039] Example 3

[0040] A high-quality steel anticorrosion coating, comprising component A and component B, wherein:

[0041] Component A includes, by weight, 50 parts of bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100g, 15 parts of propylene oxide phenyl ether, 6 parts of aluminum tripolyphosphate, 4 parts of mica iron oxide, 2 parts of potassium phytate, 20 parts of calcium silicate, 1.5 parts of KH560, 0.5 parts of BYK163, and 1 part of silicone oil;

[0042] Component B includes 100 parts of polyamide curing agent by weight.

[0043] The mass ratio of component A to component B is 6:1.

[0044] The above-mentioned high-quality steel anticorrosive coating is prepared by the following method:

[0045] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives were placed in a mixer at a stirring speed of 1000 r / min for 40 min, stirred evenly, and then ground on a ball mill and sieved through a 300 mesh sieve to obtain component A;

[0046] S2. Prepare component B polyamide curing agent;

[0047] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0048] Example 4

[0049] A high-quality steel anticorrosion coating, comprising component A and component B, wherein:

[0050] Component A includes, by weight, 45 parts of bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100g, 12 parts of propylene oxide phenyl ether, 8 parts of aluminum tripolyphosphate, 4 parts of mica iron oxide, 3 parts of potassium phytate, 25 parts of calcium silicate, 2.5 parts of KH550, and 0.5 parts of BYK180;

[0051] Component B includes 100 parts of polyamide curing agent by weight.

[0052] The mass ratio of component A to component B is 5:1.

[0053] The above-mentioned high-quality steel anticorrosive coating is prepared by the following method:

[0054] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives were placed in a mixer at a stirring speed of 900 r / min for 45 min, stirred evenly, and then ground on a ball mill and passed through a 300 mesh sieve to obtain component A;

[0055] S2. Prepare component B polyamide curing agent;

[0056] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0057] Example 5

[0058] A high-quality steel anticorrosion coating, comprising component A and component B, wherein:

[0059] Component A includes, by weight, 45 parts of bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100g, 12 parts of propylene oxide phenyl ether, 6 parts of aluminum tripolyphosphate, 6 parts of mica iron oxide, 3 parts of potassium phytate, 25 parts of calcium silicate, 2.5 parts of KH550, and 0.5 parts of BYK180;

[0060] Component B includes 100 parts of polyamide curing agent by weight.

[0061] The mass ratio of component A to component B is 5:1.

[0062] The above-mentioned high-quality steel anticorrosive coating is prepared by the following method:

[0063] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives were placed in a mixer at a stirring speed of 900 r / min for 45 min, stirred evenly, and then ground on a ball mill and passed through a 300 mesh sieve to obtain component A;

[0064] S2. Prepare component B polyamide curing agent;

[0065] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0066] Comparative Example 1

[0067] A high-quality steel anticorrosion coating, comprising component A and component B, wherein:

[0068] Component A includes, by weight, 45 parts of bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100 g, 12 parts of propylene oxide phenyl ether, 15 parts of aluminum tripolyphosphate, 25 parts of calcium silicate, 2.5 parts of KH550, and 0.5 parts of BYK180;

[0069] Component B includes 100 parts of polyamide curing agent by weight.

[0070] The mass ratio of component A to component B is 5:1.

[0071] The above-mentioned high-quality steel anticorrosive coating is prepared by the following method:

[0072] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives were placed in a mixer at a stirring speed of 900 r / min for 45 min, stirred evenly, and then ground on a ball mill and passed through a 300 mesh sieve to obtain component A;

[0073] S2. Prepare component B polyamide curing agent;

[0074] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0075] Comparative Example 2

[0076] A high-quality steel anticorrosion coating, comprising component A and component B, wherein:

[0077] Component A includes, by weight, 45 parts of bisphenol A epoxy resin with an epoxy value of 0.51-0.54 eq / 100g, 12 parts of propylene oxide phenyl ether, 10 parts of aluminum tripolyphosphate, 5 parts of mica iron oxide, 25 parts of calcium silicate, 2.5 parts of KH550, and 0.5 parts of BYK180;

[0078] Component B includes 100 parts of polyamide curing agent by weight.

[0079] The mass ratio of component A to component B is 5:1.

[0080] The above-mentioned high-quality steel anticorrosive coating is prepared by the following method:

[0081] S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives were placed in a mixer at a stirring speed of 900 r / min for 45 min, stirred evenly, and then ground on a ball mill and passed through a 300 mesh sieve to obtain component A;

[0082] S2. Prepare component B polyamide curing agent;

[0083] S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

[0084] 2. Anti-corrosion coating performance

[0085] Table 1

[0086]

[0087] Note: Salt spray resistance, rust removal reaches St2 grade steel plate;

[0088] Salt water resistance, (40±2)℃, 3% NaCl treatment;

[0089] Oil resistance, ①60℃ oil-water mixture (m(0# diesel): m(water)=5:95, 180d); ②0# diesel (180d); ③92# gasoline (180d).

[0090] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-quality steel anticorrosion coating, characterized in that: The invention comprises component A and component B, wherein component A comprises, by weight, 40-50 parts of epoxy resin, 10-15 parts of propylene oxide phenyl ether, 6-9 parts of aluminum tripolyphosphate, 4-6 parts of mica iron oxide, 2-3 parts of potassium phytate, 20-30 parts of calcium silicate and 2-3 parts of auxiliary agent; and component B comprises, by weight, 100 parts of polyamide curing agent.

2. The high-quality steel anticorrosion coating according to claim 1, characterized in that: The mass ratio of aluminum tripolyphosphate, mica iron oxide and potassium phytate is 3:2:

1.

3. The high-quality steel anticorrosion coating according to claim 1, characterized in that: The epoxy resin is a bisphenol A type epoxy resin with an epoxy value of 0.51-0.54 eq / 100g.

4. The high-quality steel anticorrosion coating according to claim 1, characterized in that: The particle sizes of aluminum tripolyphosphate, mica iron oxide and calcium silicate are all controlled to be 200-300 meshes.

5. The high-quality steel anticorrosion coating according to claim 1, characterized in that: The auxiliary agent is one or any combination of a dispersant, a leveling agent, a wetting agent, a defoaming agent and a coupling agent.

6. The high-quality steel anticorrosion coating according to claim 1, characterized in that: The mass ratio of component A to component B is (4-7):

1.

7. A method for preparing a high-quality steel anticorrosive coating, characterized in that: The following steps are involved: S1. The epoxy resin, propylene oxide phenyl ether, aluminum tripolyphosphate, mica iron oxide, potassium phytate, calcium silicate, and additives are placed in a blender, stirred evenly, and then ground on a ball mill, passed through a 300 mesh sieve, to obtain component A; S2. Prepare component B polyamide curing agent; S3. Mix component A and component B in proportion to obtain a high-quality steel anti-corrosion coating.

8. The method for preparing a high-quality steel anticorrosive coating according to claim 7, characterized in that: In step S1, the stirring speed is 800r / min-1000r / min, and the stirring time is 40-50min.

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