Environmentally-friendly epoxy resin coating for buildings

Abstract

The invention discloses an environmentally-friendly epoxy resin coating for buildings. The water-based environmentally-friendly coating which is prepared from bisphenol A type epoxy resin modified byhigh-temperature glass flakes used as a base material, environmentally-friendly silica gel filler, a toughening agent and other multiple filler or addition agents are free of residual solvents; raw materials of the environmentally-friendly epoxy resin coating are environmentally-friendly and have low toxicity; the filler can be evenly dispersed; and the environmentally-friendly epoxy resin coatingcomprises the following raw materials in parts by weight: 60 to 90 parts of modified epoxy resin matrix material, 12 to 18 parts of environmentally-friendly silica gel filler, 6 to 15 parts of epoxyreactive diluent, 8 to 13 parts of core-shell structure toughening agent, 4 to 8 parts of sodium methylene bis-naphthalene sulfonate, 2 to 6 parts of carbon black-SiO2 double nanofiller, 3 to 8 partsof polydimethylsiloxane and 32-58 parts of deionized water. A preparation method of the environmentally-friendly epoxy resin coating comprises the following steps of: preparing nanometer slurry, preparing a component A and oscillating a mixed material. The environmentally-friendly epoxy resin coating for buildings has good weather resistance, salt spray resistance and wear resistance, and is suitable as building exterior wall or interior wall coating.

Description

technical field [0001] The invention relates to the technical field of water-based architectural coatings, in particular to an environmentally friendly epoxy resin coating for construction. Background technique [0002] In the prior art, in order to protect buildings, coatings should be designed according to the use environment, building type, and substrate characteristics. For example, in order to improve the wear resistance of wooden buildings, the relevant coatings should have certain wear resistance properties. Among them, epoxy resin coating is a kind of coating with excellent bonding performance, wear resistance and anticorrosion performance, which is prepared with epoxy resin as the main component and various fillers, additives and solvents. According to the use performance, there are generally wear-resistant epoxy coatings, anti-corrosion epoxy coatings, anti-static epoxy coatings, and architectural decoration epoxy coatings. [0003] Epoxy coatings for architectura...

AI Technical Summary

Problems solved by technology

It mainly has the following problems: (1) the organic solvents that exist in the formula usually use medium polar solutions such as toluene, benzene, ethyl acetate, etc., which have better solubility to epoxy resins and auxiliary agents and are conducive to molecular diffusion, but The coating is accompanied by the volatilization of the solvent during the film forming process, especially after curing at room temperature, a certain amount of solvent always remains, and the volatilization rate is extremely slow, and the residue can be detected after many years; (2) Fillers such as talcum powder and white carbon black It cannot be evenly dispersed into the paint coating, which reduces the cohesive force of the product. It is easy to crack and fall off when it is attacked by water and chemicals, which affects the corrosion resistance and wear resistance; (3) According to the latest HJ2537-2014 Interpretation of the "Technical Requirements for Environmental Labeling Products Water-based Coatings" standard, water-based coatings must not artificially add phthalates, glycol ethers, halogenated hydrocarbons, toluene, xylene and other substances harmful to humans, ethylene glycol Ether and its esters should not exceed 100mg / kg. Existing coatings usually use phthalates as plasticizers and softeners, and glycol ethers as surfactants, which need to be strictly controlled

But in nano-MoS 2 The highly toxic CCl is used in the preparation of anti-wear agent 4 , and did not disclose the specific components of leveling agent, dispersant, defoamer, and antirust agent, the repeatability is poor, and it does not meet the requirements of environmentally friendly epoxy resin coatings

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