Anticorrosive property prolonging method of long-acting water-based anticorrosive paint

Abstract

The invention relates to the field of water-based anti-corrosion coatings, in particular to an anti-corrosion prolonging method of a long-acting water-based anti-corrosion coating, which comprises the following preparation steps: S1, preparing materials; the anti-rust paint is prepared from modified water-based resin, deionized water, anti-rust pigment, filler, a dispersing agent, a defoaming agent, an anti-flash-rust agent, a rheological additive, a base material wetting agent, a thickening agent, nano zinc powder, triethylamine and silicon dioxide / graphene composite filler. The strength of a coating film is improved by using good mechanical properties of acrylic resin, the hardness of the coating is improved by adding a rigid chain segment of organic silicon, the impact resistance is endowed by a flexible chain segment of acrylic acid, and the binding force of the coating and a metal substrate is increased by adding a silane coupling agent during modification mixing, so that the service life of the coating is prolonged. Meanwhile, the silicon dioxide / graphene composite filler is added, so that the thermal stability of organic silicon bonds is high, the high-temperature resistance of the coating is ensured, the barrier property and the corrosion resistance of the coating are synchronously improved, the corrosion resistance and the service life of the coating are ensured, and the practicability is improved.

Description

Technical Field

[0001] The present invention relates to the field of waterborne anti-corrosion coatings, and particularly to a method for extending the anti-corrosion property of a long-lasting waterborne anti-corrosion coating. Background Art

[0002] Waterborne anti-corrosion coatings use water as the dispersion medium and prevent the corrosion of substrates such as metals by mechanisms such as physical barrier, chemical passivation, or electrochemical protection. Their core feature is replacing organic solvents (such as benzene and ketone) in traditional coatings with water, significantly reducing the emission of volatile organic compounds (VOCs). Generally, they are made of waterborne resins as the substrate and added with certain rust-proof components and additives.

[0003] Due to differences in their formulation structures, the performance of waterborne anti-corrosion coatings varies greatly, and they have broad application prospects, such as the anti-corrosion protection of metal structures such as automobile chassis, chemical pipelines, and offshore platforms, as well as facilities exposed to humid or salt spray environments such as bridges, railways, and steel structure buildings. Also, according to changes in curing requirements, they can also be applicable to places where rapid construction is required (such as applying primer within 2 hours) or places sensitive to VOC emissions. Patent No. CN104479502A discloses a waterborne anti-corrosion coating made from the following raw materials in parts by weight: 100 - 200 of BH-620 water-dispersible epoxy resin, 10 - 20 parts of zinc phosphate, 10 - 20 parts of aluminum phosphate, 1 - 5 parts of BZ-1250 ultrafine talc powder, 1 - 10 parts of R-930 titanium dioxide, and 1 - 10 parts of anti-corrosion additives. The waterborne anti-corrosion coating described in the present invention has good anti-corrosion effects and broad prospects in industrial applications. Patent No. CN109554072A discloses a preparation method of a waterborne anti-corrosion coating. The steps are as follows: First, prepare dispersed graphene, and then blend epoxy resin, curing agent, dibutyl phthalate, nano-titanium dioxide, zinc phosphate, and dispersed graphene in a mass ratio of 80 - 100:5 - 8:1 - 3:7 - 9:8 - 11:1 - 6 to prepare the waterborne anti-corrosion coating. The dispersed graphene used in the present invention has good optoelectronic properties. After surface modification such as fluid-like treatment, graphene can have better compatibility with polymers, improving the film-forming performance of the waterborne anti-corrosion coating. Moreover, graphene can make the coating conductive and play an anti-corrosion role at the same time, and nano-titanium dioxide can play a role in disinfection and ultraviolet shielding.

[0004] Currently, there are certain limitations in improving the long-lasting anti-corrosion performance of waterborne anti-corrosion coatings. After the coating is applied and forms a film to protect the surface of metal parts, the single-component waterborne resin currently has certain limitations. The mechanical properties of the coating film are poor, affecting the protection life. At the same time, the adsorption between metal parts and the coating is poor. In high-temperature and high-acid environments, the coating film is prone to color change and softening, affecting the adhesion and resulting in a limited anti-corrosion life of the coating. Summary of the Invention

[0005] In order to overcome the problems that the mechanical properties of the coating film are poor, affecting the protection life, and in high-temperature and high-acid environments, the coating film is prone to color change and softening, affecting the adhesion.

[0006] The technical solution of the present invention is: a method for extending the anti-corrosion property of a long-lasting waterborne anti-corrosion coating, including the following preparation steps:

[0007] S1. Material preparation, modified waterborne resin, deionized water, anti-rust pigment, filler, dispersant, defoamer, anti-flash rust agent, rheology aid, substrate wetting agent, thickener, nano zinc powder, triethylamine and silica / graphene composite filler;

[0008] S2. Preparation of premix, successively add deionized water, dispersant, defoamer under stirring, and slowly add anti-rust pigment and filler after mixing evenly to obtain a premix;

[0009] S3. Grinding treatment, grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain a slurry, and for high-requirement coatings, control the grinding fineness ≤ 20 microns to ensure uniform dispersion of the pigment and filler and form a stable slurry;

[0010] S4. Resin mixing, mix the ground slurry and the modified waterborne resin in a finished product tank, add a substrate wetting agent and an anti-flash rust agent, and finally add a silica / graphene composite filler to obtain a resin mixture;

[0011] S5. Performance adjustment, add triethylamine to the resin mixture to adjust the PH to 7.5 - 8.5, then add a rheology aid and a thickener to the resin mixture to adjust the coating viscosity, ensure the construction leveling property and storage stability, and add nano zinc powder to introduce an electrochemical protection mechanism and strengthen the anti-corrosion performance;

[0012] S6. Adjust the viscosity of the finished product in S5 with deionized water, and then perform filtration treatment through a filtration device to obtain the final coating product.

[0013] Preferably, the modified waterborne resin is prepared by mixing an organosilicon emulsion and an acrylic emulsion in proportion, specifically including the following preparation steps:

[0014] 1). Mix the organosilicon emulsion and the acrylic emulsion in proportion, and add an anionic / nonionic composite emulsifier, stir at a speed of 500 - 800 r / min for 30 minutes;

[0015] 2). Add a silane coupling agent to the materials in step 1), and stir at a speed of 800 - 1200 r / min for 30 minutes to achieve uniform dispersion;

[0016] 3) Subject the materials in 2) to ultrasonic treatment at a frequency of 40 kHz for 20 minutes;

[0017] 4) Adjust the pH of the mixture in 3) to 7.5 - 8.5 with ammonia water, cure it at room temperature for 24 hours, and filter it through an 80-mesh screen to obtain a composite modified waterborne resin. Add polyvinylpyrrolidone to prevent stratification during storage.

[0018] Preferably, the mixing mass ratio of the silicone emulsion to the acrylic emulsion is 1:3 - 1:5, and the addition amount of polyvinylpyrrolidone is 2 - 3%. The modified waterborne resin adopts a physical modification method, and the overall process is simple with low production costs.

[0019] Preferably, the rust-inhibiting pigment is iron oxide red and phosphosilicate, and the filler is one or more of titanium dioxide, talc powder, and barium sulfate.

[0020] Preferably, the silica / graphene composite filler is composed of fumed silica and graphene powder, and the two are physically blended in proportion by a ball mill. Add 0.5% silane coupling agent to the mixture to enhance the interfacial bonding force.

[0021] Preferably, the mass ratio of fumed silica to graphene powder is 1:2 - 1:3, the rotation speed of the ball mill is 300 r / min, and the blending time is 4 hours.

[0022] Preferably, the particle size of the nano zinc powder is 30 - 80 nm, and 0.5 - 1% magnesium stearate is added as an anti-settling agent when adding.

[0023] Preferably, the dispersant is a non-ionic polyether-modified polysiloxane dispersant, and the anti-flash rust agent is a sodium nitrite substitute.

[0024] Preferably, the formulation composition of the materials in S1 by mass percentage is;

[0025] Modified waterborne resin 40 - 80%, deionized water balance, rust-inhibiting pigment 5 - 15%, filler 2 - 5%, dispersant 0.3 - 0.8%, defoaming agent 0.1 - 0.3%, anti-flash rust agent 0.5 - 1.5%, rheology aid 0.05 - 0.5%, substrate wetting agent 0.1 - 1.0%, thickener 0.2 - 0.6%, nano zinc powder 4 - 8%, triethylamine in appropriate amount, and silica / graphene composite filler 3 - 8%.

[0026] A method for extending the anti-corrosion property of a long-lasting waterborne anti-corrosion coating further includes a construction method, and the construction method includes the following steps:

[0027] Step 1: Remove oil stains, rust, mill scale and dust on the substrate surface. Use sandblasting treatment (Sa2.5 level) or mechanical grinding (roughness ≥ 30μm) to ensure the formation of surface cleanliness and micro-anchoring structure;

[0028] Step 2: Use phosphate conversion coating or silane treatment agent (such as KH-550) to improve the coating adhesion;

[0029] Step 3: Spray, and use low-temperature drying (60 degrees) after spraying.

[0030] Advantages of the present invention:

[0031] For the method of extending the anti-corrosion property of the long-acting waterborne anti-corrosion coating, after mixing and modifying silicone resin and acrylic resin as the substrate, the good mechanical properties of acrylic resin are used to increase the strength of the coating film. The rigid segment of silicone is added to improve the coating hardness, and the flexible segment of acrylic endows impact resistance. When mixing and modifying, silane coupling agent is added to increase the bonding force between the coating and the metal substrate. At the same time, with the addition of silica / graphene composite filler, the high thermal stability of silicone bond ensures the high-temperature resistance of the coating, and simultaneously improves the barrier property and anti-corrosion property of the coating, ensuring the anti-corrosion property and its service life of the coating, and improving the practicability. Specific embodiments

[0032] The present invention will be further described below with reference to the drawings and embodiments.

[0033] Embodiment 1

[0034] The present invention provides an embodiment: a method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating, including the following preparation steps:

[0035] S1. Material preparation, modified waterborne resin, deionized water, anti-rust pigment, filler, dispersant, defoamer, anti-flash rust agent, rheology aid, substrate wetting agent, thickener, nano zinc powder, triethylamine and silica / graphene composite filler;

[0036] S2. Preparation of premix, sequentially add deionized water, dispersant, defoamer under stirring, and slowly add anti-rust pigment and filler after mixing evenly to obtain premix;

[0037] S3. Grinding treatment, grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain slurry;

[0038] S4. Resin mixing, mix the ground slurry and modified waterborne resin in a finished product tank, add substrate wetting agent and anti-flash rust agent, and finally add silica / graphene composite filler to obtain resin mixture;

[0039] S5. Performance adjustment: Add triethylamine to the resin mixture to adjust the pH to 7.5 - 8.5. Then add a rheology additive and a thickener to the resin mixture to adjust the coating viscosity, and add nano zinc powder.

[0040] S6. Adjust the viscosity of the finished product in S5 with deionized water, and then filter it through a filtering device to obtain the final coating product.

[0041] The formula composition of the materials in S1 by mass percentage is as follows;

[0042] Modified waterborne resin 70%, deionized water as the balance, rust-inhibiting pigment 10%, filler 3%, dispersant 0.6%, defoamer 0.1%, anti-flash rust agent 0.5%, rheology additive 0.1%, substrate wetting agent 0.4%, thickener 0.3%, nano zinc powder 4%, appropriate amount of triethylamine, and silica / graphene composite filler 4%.

[0043] The modified waterborne resin is prepared by mixing an organosilicon emulsion and an acrylic emulsion in proportion, and specifically includes the following preparation steps:

[0044] 1). Mix the organosilicon emulsion and the acrylic emulsion in proportion, and add an anionic / nonionic composite emulsifier, with a stirring speed of 500 - 800 r / min and a stirring time of 30 minutes.

[0045] 2). Add a silane coupling agent to the materials in step 1) and stir at a speed of 800 - 1200 r / min for 30 minutes to achieve uniform dispersion.

[0046] 3). Ultrasonically treat the materials in 2) at a frequency of 40 kHz for 20 minutes.

[0047] 4). Adjust the pH of the mixture in 3) to 7.5 - 8.5 with ammonia water, cure it at room temperature for 24 hours, and filter it through an 80-mesh screen to obtain the composite modified waterborne resin, and add polyvinylpyrrolidone.

[0048] The mixing mass ratio of the organosilicon emulsion and the acrylic emulsion is 1:3 - 1:5, and the addition amount of polyvinylpyrrolidone is 2 - 3%.

[0049] The rust-inhibiting pigment is iron oxide red and phosphosilicate, and the filler is titanium dioxide, talc powder, and barium sulfate.

[0050] The silica / graphene composite filler is composed of fumed silica and graphene powder, and the two are physically blended in proportion by a ball mill, and 0.5% of silane coupling agent is added to the mixture to enhance the interfacial bonding force.

[0051] The mass ratio of fumed silica and graphene powder is 1:2 - 1:3, the rotational speed of the ball mill is 300 r / min, and the blending time is 4 hours.

[0052] The particle size of the nano zinc powder is 30 - 80 nm, and 0.5 - 1% of magnesium stearate is added as an anti - settling agent when adding.

[0053] The dispersant is a non - ionic polyether - modified polysiloxane, and the anti - flash rust agent is a sodium nitrite substitute.

[0054] Example Two

[0055] The present invention provides an example: a method for extending the anti - corrosion property of a long - acting water - based anti - corrosion coating, including the following preparation steps:

[0056] S1. Material preparation, modified water - based resin, deionized water, rust - preventive pigment, filler, dispersant, defoamer, anti - flash rust agent, rheological aid, substrate wetting agent, thickener, nano zinc powder, triethylamine, and silica / graphene composite filler;

[0057] S2. Preparation of premix, successively add deionized water, dispersant, and defoamer under stirring, and slowly add rust - preventive pigment and filler after mixing evenly to obtain a premix;

[0058] S3. Grinding treatment, grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain a slurry;

[0059] S4. Resin mixing, mix the ground slurry and the modified water - based resin in a finished product tank, add a substrate wetting agent and an anti - flash rust agent, and finally add silica / graphene composite filler to obtain a resin mixture;

[0060] S5. Performance adjustment, add triethylamine to the resin mixture to adjust the pH to 7.5 - 8.5, then add a rheological aid and a thickener to adjust the coating viscosity, and add nano zinc powder;

[0061] S6. Adjust the viscosity of the finished product in S5 with deionized water, and then perform filtration treatment through a filtering device to obtain the final coating product.

[0062] The formula composition of the materials in S1 by mass percentage is;

[0063] Modified water - based resin 80%, deionized water as the balance, rust - preventive pigment 5%, filler 2%, dispersant 0.3 - 0.8%, defoamer 0.1%, anti - flash rust agent 0.5%, rheological aid 0.05%, substrate wetting agent 0.1%, thickener 0.2%, nano zinc powder 4%, appropriate amount of triethylamine, and silica / graphene composite filler 8%.

[0064] The modified water - based resin is prepared by mixing an organosilicon emulsion and an acrylic emulsion in proportion, and specifically includes the following preparation steps:

[0065] 1), Mix the silicone emulsion and acrylic emulsion in proportion. The mixing mass ratio of the silicone emulsion to the acrylic emulsion is 1:3 - 1:5, and add an anionic / nonionic composite emulsifier. Stir at a speed of 500 - 800 r / min for 30 minutes;

[0066] 2), Add a silane coupling agent to the material in step 1), and stir at a speed of 800 - 1200 r / min for 30 minutes to achieve uniform dispersion;

[0067] 3), Ultrasonically treat the material in 2) at a frequency of 40 kHz for 20 minutes;

[0068] 4), Adjust the pH of the mixture in 3) to 7.5 - 8.5 with ammonia water, cure at room temperature for 24 hours, and filter through an 80 - mesh screen to obtain a composite - modified water - borne resin, and add polyvinylpyrrolidone. The addition amount of polyvinylpyrrolidone is 2 - 3%.

[0069] Example Three

[0070] The present invention provides an example: A method for extending the anti - corrosion property of a long - acting water - borne anti - corrosion coating, including the following preparation steps:

[0071] S1, Material preparation: Modified water - borne resin, deionized water, anti - rust pigment, filler, dispersant, defoamer, anti - flash - rust agent, rheology aid, substrate wetting agent, thickener, nano - zinc powder, triethylamine, and silica / graphene composite filler;

[0072] S2, Preparation of premix: Under stirring, sequentially add deionized water, dispersant, and defoamer. After mixing evenly, slowly add anti - rust pigment and filler to obtain a premix;

[0073] S3, Grinding treatment: Grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain a slurry;

[0074] S4, Resin mixing: Mix the ground slurry and the modified water - borne resin in a finished product tank, add a substrate wetting agent and an anti - flash - rust agent, and finally add a silica / graphene composite filler to obtain a resin mixture;

[0075] S5, Performance adjustment: Add triethylamine to the resin mixture to adjust the pH to 7.5 - 8.5, then add a rheology aid and a thickener to the resin mixture to adjust the coating viscosity, and add nano - zinc powder;

[0076] S6, Adjust the viscosity of the finished product in S5 with deionized water, and then filter through a filtering device to obtain the final coating product.

[0077] The formula composition of the materials in S1 by mass percentage is;

[0078] 75% modified aqueous resin, balance deionized water, 10% anti-rust pigment, 5% filler, 0.3% dispersant, 0.1% defoamer, 0.5% anti-flooding and anti-rust agent, 0.05% rheology aid, 1.0% substrate wetting agent, 0.2% thickener, 4% nano zinc powder, appropriate amount of triethylamine, and 3% silica / graphene composite filler.

[0079] The modified aqueous resin is prepared by mixing silicone emulsion and acrylic emulsion in proportion, and specifically includes the following preparation steps:

[0080] 1), Mix the silicone emulsion and acrylic emulsion in proportion. The mixing mass ratio of the silicone emulsion and acrylic emulsion is 1:3 - 1:5, and an anionic / nonionic composite emulsifier is added. The stirring speed is 500 - 800 r / min, and the stirring time is 30 minutes;

[0081] 2), Add a silane coupling agent to the materials in step 1) and stir at a speed of 800 - 1200 r / min for 30 minutes to achieve uniform dispersion;

[0082] 3), Ultrasonically treat the materials in 2) with a frequency of 40 kHz for 20 minutes;

[0083] 4), Adjust the pH of the mixture in 3) to 7.5 - 8.5 with ammonia water, cure at room temperature for 24 hours, and filter through an 80-mesh screen to obtain a composite modified aqueous resin. Then add polyvinylpyrrolidone, and the addition amount of polyvinylpyrrolidone is 2 - 3%.

[0084] Example 4

[0085] The present invention provides an example: a method for extending the anti-corrosion property of a long-lasting aqueous anti-corrosion coating, including the following preparation steps:

[0086] S1, Material preparation, modified aqueous resin, deionized water, anti-rust pigment, filler, dispersant, defoamer, anti-flooding and anti-rust agent, rheology aid, substrate wetting agent, thickener, nano zinc powder, triethylamine, and silica / graphene composite filler;

[0087] S2, Preparation of premix, Add deionized water, dispersant, and defoamer in sequence under stirring. After mixing evenly, slowly add anti-rust pigment and filler to obtain a premix;

[0088] S3, Grinding treatment, Grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain a slurry;

[0089] S4, Resin mixing, Mix the ground slurry and the modified aqueous resin in a finished product tank, add substrate wetting agent and anti-flooding and anti-rust agent, and finally add silica / graphene composite filler to obtain a resin mixture;

[0090] S5. Performance adjustment: Add triethylamine to the resin mixture to adjust the pH to 7.5 - 8.5. Then add a rheology aid and a thickener to the resin mixture to adjust the coating viscosity, and add nano zinc powder.

[0091] S6. Adjust the viscosity of the finished product in S5 with deionized water, and then filter it through a filtering device to obtain the final coating product.

[0092] The formula composition of the materials in S1 by mass percentage is as follows:

[0093] Modified waterborne resin 50%, deionized water balance, anti-rust pigment 15%, filler 5%, dispersant 0.5%, defoamer 0.3%, anti-flash rust agent 1%, rheology aid 0.2%, substrate wetting agent 0.5%, thickener 0.4%, nano zinc powder 5%, appropriate amount of triethylamine, and silica / graphene composite filler 5%.

[0094] The modified waterborne resin is prepared by mixing an organosilicon emulsion and an acrylic emulsion in a certain proportion, and specifically includes the following preparation steps:

[0095] 1). Mix the organosilicon emulsion and the acrylic emulsion in a certain proportion. The mixing mass ratio of the organosilicon emulsion to the acrylic emulsion is 1:3 - 1:5, and add an anionic / nonionic composite emulsifier. Stir at a speed of 500 - 800 r / min for 30 minutes.

[0096] 2). Add a silane coupling agent to the materials in step 1) and stir at a speed of 800 - 1200 r / min for 30 minutes to achieve uniform dispersion.

[0097] 3). Ultrasonically treat the materials in 2) at a frequency of 40 kHz for 20 minutes.

[0098] 4). Adjust the pH of the mixture in 3) to 7.5 - 8.5 with ammonia water, cure it at room temperature for 24 hours, and filter it through an 80-mesh screen to obtain the composite modified waterborne resin, and add polyvinylpyrrolidone. The addition amount of polyvinylpyrrolidone is 2 - 3%.

[0099] Comparative Example 1

[0100] The present invention provides an example: A method for extending the anti-corrosion property of a long-lasting waterborne anti-corrosion coating, including the following preparation steps:

[0101] S1. Material preparation: Epoxy acrylate resin, deionized water, anti-rust pigment, filler, dispersant, defoamer, anti-flash rust agent, rheology aid, substrate wetting agent, thickener, nano zinc powder, triethylamine, and silica / graphene composite filler.

[0102] S2. Premix preparation: Add deionized water, dispersant, and defoamer in sequence under stirring. After mixing evenly, slowly add anti-rust pigment and filler to obtain the premix.

[0103] S3. Grinding treatment: Grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain the slurry.

[0104] S4. Resin mixing: Mix the ground slurry and the modified waterborne resin in the finished product tank, add substrate wetting agent and anti-flooding and anti-rust agent, and finally add silica / graphene composite filler to obtain the resin mixture.

[0105] S5. Performance adjustment: Add triethylamine to the resin mixture to adjust the pH to 7.5 - 8.5, then add rheological aid and thickener to the resin mixture to adjust the coating viscosity, and add nano zinc powder.

[0106] S6. Adjust the viscosity of the finished product in S5 with deionized water, and then perform filtration treatment through a filtration device to obtain the final coating product.

[0107] The formula composition of the materials in S1 by mass percentage is as follows;

[0108] Epoxy acrylate resin 75%, deionized water balance, anti-rust pigment 10%, filler 5%, dispersant 0.3%, defoamer 0.1%, anti-flooding and anti-rust agent 0.5%, rheological aid 0.05%, substrate wetting agent 1.0%, thickener 0.2%, nano zinc powder 4%, appropriate amount of triethylamine, and silica / graphene composite filler 3%.

[0109] Comparative Example 2

[0110] The present invention provides an example: A method for extending the anti-corrosion property of a long-lasting waterborne anti-corrosion coating, including the following preparation steps:

[0111] S1. Material preparation: Waterborne epoxy resin, deionized water, anti-rust pigment, filler, dispersant, defoamer, anti-flooding and anti-rust agent, rheological aid, substrate wetting agent, thickener, nano zinc powder, triethylamine, and silica / graphene composite filler;

[0112] S2. Premix preparation: Add deionized water, dispersant, and defoamer in sequence under stirring. After mixing evenly, slowly add anti-rust pigment and filler to obtain the premix.

[0113] S3. Grinding treatment: Grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain the slurry.

[0114] S4. Resin mixing: Mix the ground slurry and the modified waterborne resin in the finished product tank, add substrate wetting agent and anti-flooding and anti-rust agent, and finally add silica / graphene composite filler to obtain the resin mixture.

[0115] S5. Performance adjustment: Add triethylamine to the resin mixture to adjust the pH to 7.5 - 8.5, then add a rheology aid and a thickener to the resin mixture to adjust the coating viscosity, and add nano zinc powder.

[0116] S6. Adjust the viscosity of the finished product in S5 with deionized water, and then filter it through a filtering device to obtain the final coating product.

[0117] The formula composition of the materials in S1 by mass percentage is as follows:

[0118] Waterborne epoxy resin 75%, deionized water as the balance, antirust pigment 10%, filler 5%, dispersant 0.3%, defoamer 0.1%, flash rust inhibitor 0.5%, rheology aid 0.05%, substrate wetting agent 1.0%, thickener 0.2%, nano zinc powder 4%, appropriate amount of triethylamine, and 3% of silica / graphene composite filler.

[0119] Example Five

[0120] The present invention also provides an example:

[0121] A method for extending the corrosion resistance of a long - acting water - borne anticorrosive coating, which also includes a construction method. The construction method includes the following steps:

[0122] Step 1. Remove oil stains, rust, mill scale and dust on the substrate surface. Use sandblasting treatment (Sa2.5 level) or mechanical grinding (roughness ≥ 30μm) to ensure the formation of surface cleanliness and microscopic anchoring structure.

[0123] Step 2. Use a phosphate conversion film or a silane treatment agent (such as KH - 550) to improve the coating adhesion.

[0124] Step 3. Spray, and use low - temperature drying (60 degrees) after spraying.

[0125] Prepare coatings according to Example One, Example Two, Example Three, Example Four, Comparative Example One and Comparative Example Two respectively. Then prepare six groups of experimental metal parts, and according to the construction method in Example Five, coat the coatings of Example One, Example Two, Example Three, Example Four, Comparative Example One and Comparative Example Two on the surface of the metal parts respectively. Finally, put the metal parts into the same environment for curing, conduct mechanical property tests on the coatings after curing, then put them into a test chamber for high - temperature tests and salt spray tests, and record the test data.

[0126] The test results show that Example One, Example Two, Example Three and Example Four have good hardness and impact resistance, while the surface hardness of Comparative Example One and Comparative Example Two is poor. At the same time, the adsorption property of Comparative Example One is poor and its stability in a high - temperature environment is poor, while the adsorption effect of Comparative Example Two is good.

[0127] Through the above steps, the good mechanical properties of the acrylic resin are utilized to increase the strength of the coating film. The rigid segments of silicone are added to improve the hardness of the coating. The flexible segments of acrylic endow impact resistance. And a silane coupling agent is added during the modification mixing to increase the bonding force between the coating and the metal substrate, so as to solve the problems that the mechanical properties of the coating film are poor, affecting the protection life, and in high-temperature and high-acid environments, the coating film is prone to color change and softening, affecting the adhesion.

[0128] Meanwhile, the content not detailedly described in this specification belongs to the prior art well known to those skilled in the art.

Claims

1. A method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating, characterized in that, It includes the following preparation steps: S1. Material preparation: modified waterborne resin, deionized water, rust-inhibitive pigment, filler, dispersant, defoamer, flash rust inhibitor, rheology aid, substrate wetting agent, thickener, nano zinc powder, triethylamine, and silica / graphene composite filler; S2. Preparation of premix: Add deionized water, dispersant, and defoamer successively under stirring, and slowly add rust-inhibitive pigment and filler after mixing evenly to obtain a premix; S3. Grinding treatment: Grind the premix through a sand mill, control the fineness ≤ 30 microns to obtain a slurry; S4. Resin mixing: Mix the ground slurry and modified waterborne resin in a finished product tank, add substrate wetting agent and flash rust inhibitor, and finally add silica / graphene composite filler to obtain a resin mixture; S5. Performance adjustment: Add triethylamine to the resin mixture to adjust the pH to 7.5 - 8.5, then add rheology aid and thickener to adjust the coating viscosity, and add nano zinc powder; S6. Adjust the viscosity of the finished product in S5 with deionized water, and then filter it through a filtering device to obtain the final coating product.

2. The method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating according to claim 1, characterized in that: The modified waterborne resin is prepared by mixing silicone emulsion and acrylic emulsion in proportion, and specifically includes the following preparation steps: 1). Mix silicone emulsion and acrylic emulsion in proportion, add anionic / nonionic composite emulsifier, stir at a speed of 500 - 800 r / min for 30 minutes; 2). Add silane coupling agent to the materials in step 1), and stir at a speed of 800 - 1200 r / min for 30 minutes to achieve uniform dispersion; 3). Ultrasonically treat the materials in 2) with a frequency of 40 kHz for 20 minutes; 4). Adjust the pH of the system of the mixture in 3) to 7.5 - 8.5 with ammonia water, cure at room temperature for 24 hours, and filter through an 80-mesh screen to obtain a composite modified waterborne resin, and add polyvinylpyrrolidone.

3. The method for extending the anti-corrosion property of a long-acting water-based anti-corrosion coating according to claim 2, characterized in that: The mixing mass ratio of silicone emulsion and acrylic emulsion is 1:3 - 1:5, and the addition amount of polyvinylpyrrolidone is 2 - 3%.

4. The method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating according to claim 1, characterized in that: The rust-inhibitive pigment is iron oxide red and phosphosilicate, and the filler is one or more of titanium dioxide, talc powder, and barium sulfate.

5. A method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating according to claim 1, characterized in that: The silica / graphene composite filler is composed of fumed silica and graphene powder, and the two are physically blended by a ball mill in proportion, and 0.5% silane coupling agent is added to the mixture to enhance the interfacial bonding force.

6. The method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating according to claim 5, characterized in that: The mass ratio of fumed silica and graphene powder is 1:2 - 1:3, the rotation speed of the ball mill is 300 r / min, and the blending time is 4 hours.

7. A method for extending the anti-corrosion property of a long-lasting waterborne anti-corrosion coating according to claim 1, characterized in that: The particle size of the nano zinc powder is 30 - 80 nm, and 0.5 - 1% magnesium stearate is added as an anti-settling agent when adding.

8. A method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating according to claim 1, characterized in that: The dispersant is a nonionic polyether-modified polysiloxane dispersant, and the flash rust inhibitor is a sodium nitrite substitute.

9. The method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating according to claim 1, characterized in that: The formula composition of the materials in S1 by mass percentage is; Modified aqueous resin 40 - 80%, deionized water balance, rust-inhibiting pigment 5 - 15%, filler 2 - 5%, dispersant 0.3 - 0.8%, defoamer 0.1 - 0.3%, anti-flash rust agent 0.5 - 1.5%, rheology aid 0.05 - 0.5%, substrate wetting agent 0.1 - 1.0%, thickener 0.2 - 0.6%, nano zinc powder 4 - 8%, appropriate amount of triethylamine, and silica / graphene composite filler 3 - 8%.

10. The method for extending the anti-corrosion property of a long-acting waterborne anti-corrosion coating according to claim 1, characterized in that: It also includes a construction method, and the construction method includes the following steps: Step 1, remove oil stains, rust, mill scale and dust on the substrate surface, and adopt sandblasting treatment (Sa2.5 level) or mechanical grinding (roughness ≥ 30μm) to ensure the formation of surface cleanliness and micro-anchoring structure; Step 2, use phosphate conversion film or silane treatment agent (such as KH-550) to improve the coating adhesion; Step 3, spray, and adopt low-temperature drying (60 degrees) after spraying is completed.