CN-122011887-A - Anticorrosive paint for metal protection and preparation method thereof

Abstract

The invention relates to the technical field of anticorrosive paint, and particularly discloses an anticorrosive paint for metal protection and a preparation method thereof, wherein the anticorrosive paint provided by the invention has the advantages that by introducing organosilicon modified epoxy resin and utilizing a flexible silica chain segment thereof, residual internal stress generated during high-crosslinking curing of the resin is effectively released, the defects of high rigidity and easy embrittlement of the traditional epoxy coating are obviously improved, and meanwhile, good hydrophobic property is endowed to the surface of the coating; the composite modified filler effectively eliminates microscopic pores caused by filler agglomeration through the synergistic effect of physical shielding effect, chemical corrosion prevention function of zinc phosphate and interfacial covalent crosslinking of polar groups and resin, improves the corrosion resistance and adhesive force of the coating, and realizes long-acting comprehensive protection of metal substrates.

Inventors

• Guo Beiheng
• XU CHANGZHOU
• CHEN CHENG
• LU FENG
• Yue Hanzhi

Assignees

• 常州市武进晨光金属涂料有限公司

Dates

Publication Date

20260512

Application Date

20260319

Claims (9)

1. 1. The anticorrosive paint for metal protection comprises a component A and a component B, and is characterized in that the component A comprises, by weight, 80-100 parts of epoxy resin, 10-20 parts of organosilicon modified epoxy resin, 20-40 parts of composite modified filler, 1-5 parts of dispersing agent, 0.5-2 parts of defoaming agent, 0.2-0.5 part of leveling agent and 40-60 parts of deionized water, wherein the component B is polyamide curing agent.
2. 2. The anticorrosive coating according to claim 1, wherein the mass ratio of the A component to the B component is 4-8:1.
3. 3. The anticorrosive coating according to claim 1, wherein the preparation method of the composite modified filler comprises the following steps: S1, dispersing mica powder in deionized water, adding soluble zinc salt into the deionized water, stirring for adsorption, then dropwise adding phosphate solution while stirring, aging after the dropwise adding is finished, and filtering, washing and drying to obtain a zinc phosphate/mica powder material; S2, dispersing a zinc phosphate/mica powder material in an ethanol water solution, regulating the pH value of the solution to 6.8-7.2 by using an acetic acid-ammonia water buffer system, then adding tetraethoxysilane into the solution, stirring the solution, and ageing, filtering, washing and drying the solution to obtain a composite filler; s3, dispersing the composite filler in an ethanol water solution, then adding 3- (trimethoxysilyl) propyl methacrylate into the solution, stirring the mixture, and filtering, washing and drying the mixture to obtain double bond grafted composite filler; S4, dispersing the double bond grafted composite filler in an organic solvent, then adding dodecafluoroheptyl methacrylate and hydroxyethyl methacrylate into the organic solvent, stirring uniformly, then adding an initiator benzoyl peroxide, heating and stirring under a nitrogen atmosphere for reaction, and after the reaction is finished, filtering, washing and drying to obtain the composite modified filler.
4. 4. A corrosion protection coating according to claim 3, wherein in step S1, the mass ratio of mica powder, soluble zinc salt and phosphate solution is 10:1-3:15-25, and the mass fraction of phosphate solution is 5-10%.
5. 5. A corrosion protection coating according to claim 3, wherein in step S2 the mass ratio of zinc phosphate/mica powder material to ethyl orthosilicate is 10:1-2.
6. 6. A corrosion protection coating according to claim 3, wherein in step S3 the mass ratio of composite filler to propyl 3- (trimethoxysilyl) methacrylate is 10-15:0.5-1.
7. 7. The anticorrosive paint according to claim 3, wherein in the step S4, the mass ratio of the double bond grafted composite filler, the dodecafluoroheptyl methacrylate, the hydroxyethyl methacrylate and the benzoyl peroxide is 10-15:3-6:2-4:0.2-0.5.
8. 8. A corrosion resistant coating according to claim 3, wherein in step S4, the temperature of the heating and stirring reaction is 70-85 ℃, and the time of the heating and stirring reaction is 3-6 hours.
9. 9. The method for preparing the anticorrosive paint according to any one of claims 1 to 8, which is characterized by comprising the steps of injecting epoxy resin and organosilicon modified epoxy resin into a mixing tank with stirring, starting stirring, sequentially adding deionized water, a dispersing agent and a composite modified filler, uniformly stirring, grinding and dispersing by a sand mill until fineness meets film forming requirements, adding a defoaming agent and a leveling agent, uniformly dispersing to obtain a component A, and respectively storing the component A and the component B for later use.

Description

Anticorrosive paint for metal protection and preparation method thereof Technical Field The invention relates to the technical field of anti-corrosion paint, in particular to an anti-corrosion paint for metal protection and a preparation method thereof. Background The metal material plays an irreplaceable role in the fields of national important infrastructure such as ocean engineering, petrochemical industry, transportation, aerospace and the like due to the excellent mechanical property and processing characteristic. However, metal substrates are extremely susceptible to attack by moisture, oxygen, chloride ions, and various acid-base mediators in complex service environments, and serious electrochemical corrosion occurs. Such corrosion not only causes a dramatic decrease in the mechanical strength of the equipment and metallic structural members, leading to immeasurable safety hazards, but also causes significant direct and indirect economic losses. In order to effectively suppress the damage process, the application of the anti-corrosion coating on the metal surface becomes the most widely applied, economical and efficient protection means in the industry at present. The anticorrosive paint can construct a continuous and compact physical isolation barrier on the metal surface through film forming substances to directly block the contact path between the corrosive medium and the metal substrate, and meanwhile, the anticorrosive paint is assisted with the active chemical passivation or cathodic protection effect of specific antirust pigment fillers to greatly delay the occurrence and the spread of corrosion reaction, so that the service life of the metal structural member is obviously prolonged, and the safety and the long-term stability of industrial production are ensured. Among the numerous corrosion protection coating systems, epoxy resin coatings, by virtue of their excellent adhesion, excellent chemical resistance and outstanding film formation compactness, occupy an absolute predominance in the field of heavy-duty coatings. Meanwhile, in order to further improve the physical shielding and corrosion resistance of the coating, a large amount of inorganic rust-proof pigment and filler is physically blended into the epoxy matrix in the prior art, but the surface energy of the rigid inorganic particles is higher, the interface compatibility with the organic resin matrix is extremely poor, and agglomeration and phase separation are easy to occur in the curing and film-forming process of the coating. The simple physical compounding is difficult to realize an ideal labyrinth shielding effect, but a large number of micro-pores and defect channels are inevitably formed at the interface of the inorganic filler and the organic resin, so that water molecules and corrosive ions can easily permeate to the surface of the underlying metal, and the conventional epoxy anticorrosive paint is difficult to meet the long-acting anticorrosive requirement under the severe corrosion environment. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide an anti-corrosion coating for metal protection and a preparation method thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: The anticorrosive paint for metal protection comprises, by weight, 80-100 parts of epoxy resin, 10-20 parts of organosilicon modified epoxy resin, 20-40 parts of composite modified filler, 1-5 parts of dispersing agent, 0.5-2 parts of defoaming agent, 0.2-0.5 part of leveling agent and 40-60 parts of deionized water, wherein the component A is polyamide curing agent. In the technical scheme disclosed by the invention, the epoxy resin is used as a main film forming base material of the anti-corrosion coating to provide basic mechanical strength and adhesive force for the coating, and the weight parts of the epoxy resin can be 80 parts, 82 parts, 85 parts, 88 parts, 90 parts, 92 parts, 95 parts, 98 parts and 100 parts, but are not limited to the listed values, and other non-listed values in the numerical range are applicable. According to the technical scheme disclosed by the invention, the volume shrinkage rate of the coating during curing can be effectively reduced, the curing internal stress is absorbed and released, the flexibility and the shock resistance of the coating are greatly improved, and 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts and 20 parts of the organosilicon modified epoxy resin can be selected by weight, but the method is not limited to the listed numerical values, and other non-listed numerical values in the numerical range are also applicable. In the technical scheme disclosed by the invention, the anticorrosion performance and the adhesive force of the anticorrosive paint are improved by adding the composite modified filler, and the weight parts of the composite modified filler can be 20