Water-based anticorrosive primer and preparation method thereof

Abstract

The invention relates to a water-based anticorrosive primer and a preparation method thereof. The water-based anticorrosive primer comprises the following materials in parts by weight: 60-70 parts of zinc powder modified epoxy resin, 15-20 parts of modified zinc oxide, 8-10 parts of nano silicon dioxide, 3-4 parts of titanium dioxide, 0.5-1 part of a defoaming agent, 1-2 parts of a dispersing agent, 5-7 parts of a curing agent and 25-30 parts of water. The preparation method comprises the following steps: preparing the zinc powder modified epoxy resin and the modified zinc oxide, weighing the raw materials, mixing and stirring the zinc powder modified epoxy resin, the modified zinc oxide, the nano silicon dioxide and the titanium dioxide for 10-15 minutes, then adding the defoaming agent, the dispersing agent, the curing agent and the water, continuously stirring for 30-40 minutes, and uniformly mixing, thereby obtaining the paint. According to the water-based anti-corrosion primer and the preparation method thereof, the anti-corrosion performance of the water-based anti-corrosion primer is effectively improved, the drying speed is increased, and the phenomena of sagging, sedimentation and the like are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of water-based coatings, and in particular to a water-based anticorrosive primer and a preparation method thereof. Background Art

[0002] In the coatings industry, anticorrosion primers are important protective materials and are widely used in the surface treatment of various metals, concrete and other substrates to prevent them from being damaged by corrosion, oxidation and other damages. With the increasingly stringent environmental regulations and people's attention to health and safety, traditional solvent-based anticorrosion primers are gradually restricted due to their high volatile organic compound (VOC) emissions. Therefore, the development of environmentally friendly and efficient water-based anticorrosion primers has become a research hotspot in the current coatings field.

[0003] At present, there are many water-based anticorrosive primers on the market, but they still have many deficiencies in performance. For example, some water-based anticorrosive primers have poor anticorrosion performance and short salt spray resistance time, which makes it difficult to meet the needs of long-term anticorrosion; at the same time, some primers have slow drying speeds and low construction efficiency, and when the powder filler accounts for a large proportion, there are also problems such as sagging and sedimentation, which affect the appearance and performance of the coating. Based on this, the present invention provides a water-based anticorrosive primer and a preparation method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based anticorrosive primer and a preparation method thereof, which can effectively improve the anticorrosion performance of the water-based anticorrosive primer, increase the drying speed, and reduce sagging, sedimentation and the like.

[0005] On the one hand, the present invention provides a water-based anticorrosive primer, comprising the following materials in parts by weight: 60-70 parts of zinc powder modified epoxy resin, 15-20 parts of modified zinc oxide, 8-10 parts of nano-silicon dioxide, 3-4 parts of titanium dioxide, 0.5-1 parts of defoaming agent, 1-2 parts of dispersant, 5-7 parts of curing agent and 25-30 parts of water.

[0006] Furthermore, the preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 20-30 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 65-75° C. for 1-1.2 hours to obtain the obtained epoxy resin.

[0007] Furthermore, the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 100-200 meshes.

[0008] Furthermore, the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is (0.4-0.6): (16-20): (65-75): (20-22).

[0009] Furthermore, the preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 30-40 minutes, and ultrasonically treating for 1-1.5 hours, then adding deionized water, stirring for 2-3 hours at a temperature of 60-70°C, centrifuging, washing, and drying to obtain the modified zinc oxide.

[0010] Furthermore, the weight ratio of the zinc oxide, the silane coupling agent, the anhydrous ethanol and the water is (0.2-0.4): (6-8): (80-90): (10-12).

[0011] Furthermore, the drying temperature is 60-80°C and the drying time is 20-24h.

[0012] Furthermore, the dispersant is BYK-190 dispersant, and the defoamer is TEGO-810 defoamer and / or BYK-141.

[0013] Furthermore, the curing agent is polyamide 650.

[0014] On the other hand, the present invention also provides a method for preparing a water-based anti-corrosion primer, the steps comprising: preparing zinc powder modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 10-15 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 30-40 minutes to mix evenly.

[0015] The beneficial effects of the present invention are: The composite system of zinc powder modified epoxy resin and modified zinc oxide in the present invention significantly improves the overall stability of the coating by optimizing the interaction and compatibility between the components. The silane coupling agent plays a dual role here: it not only strengthens the interface bonding between zinc powder and epoxy resin, but also effectively fixes and supports zinc powder particles in the coating system by virtue of its unique molecular structure, effectively preventing the sedimentation and agglomeration of zinc powder during storage and use, and ensuring the construction performance and coating quality of the coating after long-term storage.

[0016] When this compound system is applied to water-based anticorrosive primer, a significant synergistic effect is produced between zinc powder and modified zinc oxide, further improving the anticorrosion performance of the coating. The activity of zinc powder enables it to react quickly with oxygen and corrosive media in water to form a dense oxide protective film, which effectively blocks further erosion by the corrosive media. The modified zinc oxide strengthens the dense structure and adhesion of the coating, making this protective film tougher and more durable.

[0017] At the same time, the compounding system also optimizes the leveling and permeability of the coating, accelerates the ability of the coating to form a continuous film during the drying process, thereby significantly shortening the drying time and improving production efficiency. In summary, the present invention significantly improves the anti-corrosion performance, stability, drying speed and other aspects of the water-based anti-corrosion primer by compounding the zinc powder-modified epoxy resin with the modified zinc oxide. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0019] The present embodiment provides a water-based anti-corrosion primer, comprising the following materials in parts by weight: 65 parts of zinc powder modified epoxy resin, 17 parts of modified zinc oxide, 9 parts of nano-silicon dioxide, 3.5 parts of titanium dioxide, 0.7 parts of defoaming agent, 1.5 parts of dispersant, 6 parts of curing agent and 27 parts of water.

[0020] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 25 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 70°C for 1.1 hours to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 150 mesh; the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is 0.5:18:70:21.

[0021] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 35 minutes, and ultrasonically treating for 1.2 hours, then adding deionized water, stirring for 2.5 hours at a temperature of 65°C, centrifuging, washing, and drying at a temperature of 70°C for 22 hours; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.3:7:85:11.

[0022] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0023] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder-modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder-modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 12 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 35 minutes to mix evenly, and the stirring speed is 600r / min. Example 2

[0024] The present embodiment provides a water-based anti-corrosion primer, comprising the following materials in parts by weight: 60 parts of zinc powder modified epoxy resin, 15 parts of modified zinc oxide, 8 parts of nano-silicon dioxide, 3 parts of titanium dioxide, 0.5 parts of defoaming agent, 1 part of dispersant, 5 parts of curing agent and 25 parts of water.

[0025] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 20 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 65°C for 1 hour to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 100 mesh; the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is 0.4:16:65:20.

[0026] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 30 minutes, and ultrasonically treating for 1 hour, then adding deionized water, stirring for 2 hours at a temperature of 60°C, centrifuging, washing, and drying at a temperature of 60-80°C for 20 hours to obtain the modified zinc oxide; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.2:6:80:10.

[0027] Wherein, the dispersant is BYK-190 dispersant, the defoamer is BYK-141; and the curing agent is polyamide 650.

[0028] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder-modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder-modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 10 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 30 minutes to mix evenly, and the stirring speed is 600r / min. Example 3

[0029] The present embodiment provides a water-based anti-corrosion primer, comprising the following materials in parts by weight: 70 parts of zinc powder modified epoxy resin, 20 parts of modified zinc oxide, 10 parts of nano-silicon dioxide, 4 parts of titanium dioxide, 1 part of defoaming agent, 2 parts of dispersant, 7 parts of curing agent and 30 parts of water.

[0030] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 30 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 75°C for 1.2 hours to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 200 mesh; the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is 0.6:20:75:22.

[0031] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 40 minutes, and ultrasonically treating for 1.5 hours, then adding deionized water, stirring for 3 hours at a temperature of 70°C, centrifuging, washing, and drying at a temperature of 80°C for 24 hours to obtain the modified zinc oxide; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.4:8:90:12.

[0032] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0033] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 15 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 40 minutes to mix evenly, and the stirring speed is 600r / min. Example 4

[0034] The present embodiment provides a water-based anti-corrosion primer, comprising the following materials in parts by weight: 60 parts of zinc powder modified epoxy resin, 20 parts of modified zinc oxide, 8 parts of nano-silicon dioxide, 4 parts of titanium dioxide, 0.5 parts of defoaming agent, 2 parts of dispersant, 5 parts of curing agent and 30 parts of water.

[0035] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 20 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 75°C for 1 hour to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 200 mesh; the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is 0.4:20:65:22.

[0036] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 30 minutes, and ultrasonically treating for 1.5 hours, then adding deionized water, stirring for 3 hours at a temperature of 60°C, centrifuging, washing, and drying at a temperature of 60°C for 24 hours to obtain the modified zinc oxide; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.2:8:80:12.

[0037] Wherein, the dispersant is BYK-190 dispersant, the defoamer is BYK-141; and the curing agent is polyamide 650.

[0038] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 10 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 40 minutes to mix evenly, and the stirring speed is 600r / min. Comparative Example 1

[0039] This comparative example provides a water-based anticorrosive primer, comprising the following materials in parts by weight: 65 parts of zinc powder modified epoxy resin, 17 parts of modified zinc oxide, 9 parts of nano-silicon dioxide, 3.5 parts of titanium dioxide, 0.7 parts of defoaming agent, 1.5 parts of dispersant, 6 parts of curing agent and 27 parts of water.

[0040] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 25 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 70°C for 1.1 hours to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 150 mesh; the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is 0.5:18:70:21.

[0041] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH550 with anhydrous ethanol, then stirring for 35 minutes, and ultrasonically treating for 1.2 hours, then adding deionized water, stirring for 2.5 hours at a temperature of 65°C, centrifuging, washing, and drying at a temperature of 70°C for 22 hours to obtain the modified zinc oxide; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.3:7:85:11.

[0042] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0043] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder-modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder-modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 12 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 35 minutes to mix evenly, and the stirring speed is 600r / min. Comparative Example 2

[0044] This comparative example provides a water-based anticorrosive primer, comprising the following materials in parts by weight: 65 parts of zinc powder modified epoxy resin, 17 parts of modified zinc oxide, 9 parts of nano-silicon dioxide, 3.5 parts of titanium dioxide, 0.7 parts of defoaming agent, 1.5 parts of dispersant, 6 parts of curing agent and 27 parts of water.

[0045] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH560 and zinc powder in an acetone solution, ultrasonically dispersing for 25 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 70°C for 1.1 hours to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 150 mesh; the weight ratio of the silane coupling agent KH560, zinc powder, acetone and epoxy resin is 0.5:18:70:21.

[0046] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 35 minutes, and ultrasonically treating for 1.2 hours, then adding deionized water, stirring for 2.5 hours at a temperature of 65°C, centrifuging, washing, and drying at a temperature of 70°C for 22 hours; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.3:7:85:11.

[0047] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0048] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder-modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder-modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 12 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 35 minutes to mix evenly, and the stirring speed is 600r / min. Comparative Example 3

[0049] This comparative example provides a water-based anticorrosive primer, comprising the following materials in parts by weight: 65 parts of zinc powder and epoxy resin, 17 parts of modified zinc oxide, 9 parts of nano-silicon dioxide, 3.5 parts of titanium dioxide, 0.7 parts of defoaming agent, 1.5 parts of dispersant, 6 parts of curing agent and 27 parts of water.

[0050] The weight ratio of zinc powder to epoxy resin is 18:21.

[0051] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 35 minutes, and ultrasonically treating for 1.2 hours, then adding deionized water, stirring for 2.5 hours at a temperature of 65°C, centrifuging, washing, and drying at a temperature of 70°C for 22 hours; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.3:7:85:11.

[0052] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0053] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing modified zinc oxide, weighing raw materials, mixing zinc powder, epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 12 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 35 minutes to mix evenly, and the stirring speed is 600r / min. Comparative Example 4

[0054] This comparative example provides a water-based anticorrosive primer, comprising the following materials in parts by weight: 65 parts of epoxy resin, 17 parts of modified zinc oxide, 9 parts of nano-silicon dioxide, 3.5 parts of titanium dioxide, 0.7 parts of defoaming agent, 1.5 parts of dispersant, 6 parts of curing agent and 27 parts of water.

[0055] The preparation method of the modified zinc oxide includes: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, then stirring for 35 minutes, and ultrasonically treating for 1.2 hours, then adding deionized water, stirring for 2.5 hours at a temperature of 65°C, centrifuging, washing, and drying at a temperature of 70°C for 22 hours; the weight ratio of the zinc oxide, silane coupling agent, anhydrous ethanol and water is 0.3:7:85:11.

[0056] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0057] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder-modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 12 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 35 minutes to mix evenly, and the stirring speed is 600r / min. Comparative Example 5

[0058] This comparative example provides a water-based anticorrosive primer, comprising the following materials in parts by weight: 65 parts of zinc powder modified epoxy resin, 17 parts of zinc oxide, 9 parts of nano-silicon dioxide, 3.5 parts of titanium dioxide, 0.7 parts of defoaming agent, 1.5 parts of dispersant, 6 parts of curing agent and 27 parts of water.

[0059] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 25 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 70°C for 1.1 hours to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 150 mesh; the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is 0.5:18:70:21.

[0060] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0061] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder-modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder-modified epoxy resin, zinc oxide, nano-silicon dioxide, and titanium dioxide for 12 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 35 minutes to mix evenly, and the stirring speed is 600 r / min. Comparative Example 6

[0062] This comparative example provides a water-based anticorrosive primer, comprising the following materials in parts by weight: 65 parts of zinc powder modified epoxy resin, 9 parts of nano-silicon dioxide, 3.5 parts of titanium dioxide, 0.7 parts of defoaming agent, 1.5 parts of dispersant, 6 parts of curing agent and 27 parts of water.

[0063] The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 25 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 70°C for 1.1 hours to obtain the obtained product; the epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 150 mesh; the weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is 0.5:18:70:21.

[0064] Wherein, the dispersant is BYK-190 dispersant, the defoamer is TEGO-810 defoamer; and the curing agent is polyamide 650.

[0065] The preparation method of the water-based anti-corrosion primer in this embodiment includes the following steps: preparing zinc powder-modified epoxy resin and modified zinc oxide, weighing the raw materials, mixing the zinc powder-modified epoxy resin, modified zinc oxide, nano-silicon dioxide, and titanium dioxide for 12 minutes, then adding a defoamer, a dispersant, a curing agent, and water and continuing to stir for 35 minutes to mix evenly, and the stirring speed is 600r / min.

[0066] Test Example: The water-based paint prepared in the above examples and comparative examples was tested: The corrosion resistance test is based on standard 9274-1988. A 50mm×120mm×0.3 mm aluminum plate (GB3880) is used. The back of the aluminum plate is coated. The edge sealing process is adopted. Paraffin and rosin are mixed in a ratio of 1:1 for edge sealing. The test solution is 10% sulfuric acid solution, 10% NaOH solution and 3% NaCl solution. The acid and alkali resistance and salt water resistance of the sample are tested respectively.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A water-based anticorrosive primer, characterized in that: The invention comprises the following materials in parts by weight: 60-70 parts of zinc powder modified epoxy resin, 15-20 parts of modified zinc oxide, 8-10 parts of nano silicon dioxide, 3-4 parts of titanium dioxide, 0.5-1 parts of defoaming agent, 1-2 parts of dispersant, 5-7 parts of curing agent and 25-30 parts of water.

2. A water-based anticorrosive primer according to claim 1, characterized in that: The preparation method of the zinc powder modified epoxy resin comprises: dispersing silane coupling agent KH550 and zinc powder in an acetone solution, ultrasonically dispersing for 20-30 minutes, adding epoxy resin, stirring and mixing evenly, and reacting at a temperature of 65-75° C. for 1-1.2 hours to obtain the obtained epoxy resin.

3. A water-based anticorrosive primer according to claim 2, characterized in that: The epoxy resin is epoxy resin E-12, and the mesh size of the zinc powder is 100-200 meshes.

4. A water-based anticorrosive primer according to claim 2, characterized in that: The weight ratio of the silane coupling agent KH550, zinc powder, acetone and epoxy resin is (0.4-0.6): (16-20): (65-75): (20-22).

5. A water-based anticorrosive primer according to claim 1, characterized in that: The preparation method of the modified zinc oxide comprises: mixing zinc oxide powder and silane coupling agent KH560 with anhydrous ethanol, stirring for 30-40 minutes, ultrasonically treating for 1-1.5 hours, adding deionized water, stirring for 2-3 hours at a temperature of 60-70° C., centrifuging, washing and drying to obtain the modified zinc oxide.

6. A water-based anticorrosive primer according to claim 5, characterized in that: The weight ratio of the zinc oxide, the silane coupling agent, the anhydrous ethanol and the water is (0.2-0.4): (6-8): (80-90): (10-12).

7. A water-based anticorrosive primer according to claim 5, characterized in that: The drying temperature is 60-80° C., and the drying time is 20-24 hours.

8. A water-based anticorrosive primer according to claim 1, characterized in that: The dispersant is BYK-190 dispersant, and the defoamer is TEGO-810 defoamer and / or BYK-141.

9. A water-based anticorrosive primer according to claim 1, characterized in that: The curing agent is polyamide 650.

10. A method for preparing a water-based anticorrosive primer according to any one of claims 1 to 9, characterized in that the steps include: Prepare zinc powder modified epoxy resin and modified zinc oxide, weigh the raw materials, mix the zinc powder modified epoxy resin, modified zinc oxide, nano silicon dioxide, and titanium dioxide for 10-15 minutes, then add defoamer, dispersant, curing agent and water and continue to stir for 30-40 minutes to mix evenly.

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