CN-121975413-A - Protective coating for galvanized cathode protective iron material

Abstract

The invention discloses a protective coating for a galvanized cathode protective iron material, wherein the content ratio of a multifunctional acrylic resin, a strontium chrome nanometer mixed solution, a graphene nanometer mixed solution and an isocyanate curing agent is (45-65)% (0.8-1.6)% (0.02-0.05)% (5-8.4)%, a cellulose resin is 7-12%, silver powder is 6-12%, a solvent is 5-8%, an auxiliary agent is 1-3%, and the balance is a diluent. The strontium chrome yellow nano particles form anchoring points on the surface of the iron material and simultaneously carry out complexation with the multifunctional acrylic resin and the cellulose resin, so that the adhesive force of the coating to the galvanized layer is enhanced to 10-12N/mm. The graphene nanoplatelets form a barrier to corrosive substances between the multifunctional acrylic resin and the cellulosic resin such that the corrosion resistance of the coating is enhanced. The protective coating disclosed by the invention is simple and convenient to construct, and excellent in corrosion resistance and ageing resistance is provided for galvanized cathode protective iron materials.

Inventors

• JIANG WEI

Assignees

• 蒋炜

Dates

Publication Date

20260505

Application Date

20251231

Claims (4)

1. 1. The protective coating for the galvanized cathode protective iron material comprises the following components in percentage by weight: The content ratio of the multifunctional acrylic resin, the strontium chrome nanometer mixed solution, the graphene nanometer mixed solution and the isocyanate curing agent is (45-65)% (0.8-1.6)% (0.02-0.05)% (5-8.4)% (7-12% of cellulose resin, 6-12% of silver powder, 5-8% of solvent, 1-3% of auxiliary agent and the balance of diluent, The strontium chrome yellow nano particles form anchoring points on the surface of the iron material and simultaneously carry out complexation with the multifunctional acrylic resin and the cellulose resin so as to enhance the adhesive force of the coating to the iron material to 10-12N/mm, The graphene nanoplatelets form a barrier to corrosive substances between the multifunctional acrylic resins such that the corrosion resistance of the coating is enhanced.
2. 2. The protective coating of claim 1, wherein the auxiliary agent comprises at least one of a thickener, a toughening agent, an alignment agent, a leveling agent, and a wetting dispersant.
3. 3. The protective coating of claim 1, wherein the graphene nanoplatelets are at least one of reduced graphene, oxidized graphene, physically exfoliated graphene.
4. 4. Protective coating according to claim 1, wherein the solvent is selected from butyl acetate or xylene.

Description

Protective coating for galvanized cathode protective iron material Technical Field The invention relates to the field of paint, in particular to a protective coating for a galvanized cathode protective iron material. Background The concrete guardrail is an important component part of the highway guardrail, is an important matching part of a highway bridge tunneling section, and is easy to pollute in a long-term open air environment due to the natural characteristic and surface porous shape of concrete, weathers, and after water molecules permeate, sodium chloride (soluble salt) is generated by combining with chloride ions in the concrete, so that internal expansion is further caused, and the strength and the service life of damaged concrete are accelerated. At present, most of highway guardrails are mainly galvanized, but the galvanized corrosion resistance is better, but due to the oxidation of zinc in the air, the guardrails are usually subjected to color loss and light loss after a period of time, and then are gradually blackened under the effects of pollution and tail gas, so that the visual effect is influenced. At present, the work of converting two waves into three waves of the high-speed guardrail is advanced nationwide, and meanwhile, a large number of two-wave guardrails are idle, so that the problem of recycling the left two-wave guardrails is increasingly outstanding. Because the actual working condition of the site is that the common concrete guardrail is directly cast on site, no additional anti-corrosion waterproof layer is usually used for further protection, the common paint usually loses color, loses light, peels and the like after a few months, and the expressway is frequently maintained and has larger potential safety hazards and cost, so that the high-quality coating and the construction scheme are particularly important for protecting the surface. The conventional acrylic acid paint and the alcohol acid paint are common in the prior art, but the quality of the paint is high, but the paint cannot meet the requirements, in such environments as highway traffic, the paint is generally lost in color and light after 6 months, the paint is locally peeled off and falls off after 1 year, the surface is corroded by moisture and pollutants and gradually loses efficacy, and the fluorocarbon paint is high in grade and good in effect on indexes such as aging resistance, gloss and the like, but is expensive, but the fluorocarbon paint is high in requirement, high in construction difficulty, difficult to recoat, namely the subsequent brushing of new paint is very large, poor in adhesive force and difficult to be compatible with the new coating. In the prior art, the same solvent type paint and water paint have poor capability of adhering to galvanized high-speed guardrail plates, cracking and paint stripping phenomena of temperature difference da Yi between the north and south climates, poor dirt resistance and corrosion resistance, and the like, and have short service life. The powder coating has poor pollution resistance, can not be coated and maintained on site, and has high energy consumption, high maintenance cost and the like. The hot melt laminator has poor corrosion resistance, cannot meet the requirement of artificial aging resistance, is easy to pulverize and change color in two years, cannot be coated and maintained on site, and has high energy consumption and high maintenance cost. The surface adhesive force of the retreaded paint in the current market cannot meet the technical requirements, has poor corrosion resistance, poor adhesive force, easy falling off and poor anti-fouling capability, does not have the on-site retreading maintenance function, and has no large-area popularization value. Disclosure of Invention The technical concept of the invention is divided into two aspects, namely, the adhesive force of the protective coating and the galvanized iron is enhanced by designing an anchoring point for connecting macromolecules in the galvanized layer and the coating, and the corrosion blocking capacity and the corrosion preventing capacity of the protective coating are enhanced by increasing the corrosion path of corrosive substances entering the galvanized iron and shielding the corrosive substances as much as possible. When two objects are brought together to intimate interfacial molecular contact, so that a new interfacial layer is created, adhesion is created. Adhesion involves physical effects and chemical reactions at the "interface". Adhesion is established when the coating is applied to a substrate and during drying and curing. The magnitude of these forces depends on the nature of the surface and binder (resin, polymer, binder) and can be divided into primary and secondary forces. The chemical bond is the primary valence, has much higher adhesion than the secondary valence, which is based on much weaker physical forces represented by hydrogen bonds. The type of bond and bond