A kind of imitation metal coating for building exterior wall and preparation method thereof

Abstract

The invention provides a metal-imitated coating for building external walls and a preparation method of the metal-imitated coating. The metal-imitated coating is a double-component coating for constructional engineering. The metal-imitated coating is prepared from primer A, a primer auxiliary agent B, finish paint A and a finish paint auxiliary agent B. During construction, the primer auxiliary agent B is added to the primer A, and the primer is applied to flat walls provided with diving joints, subjected to putty grinding and capable of being constructed directly in a coated manner; the finish paint auxiliary agent B is added to the finish paint A, the dried primer is coated with the finish paint, and finally, the building external walls achieve the decorative effect of an imitation aluminium plastic sheet curtain wall. According to the invention, solid content of a product under the construction condition is increased, an ester mixture is selected as a diluent, toxicity of a solventin a using process is reduced, pollution to the environment is reduced, dissolving capacity for resin and the coating is improved, applicable viscosity, diluent consumption and VOC content are reducedbetter, good paint film property of a product is kept while environmental protection property of product use is improved, and a coating film has the characteristics of good flashing property, low probability of oxidizing discoloration and long service life.

Description

technical field [0001] The invention relates to a two-component coating for construction engineering, in particular to a metal-imitating coating for building exterior walls and a preparation method thereof. Background technique [0002] my country's architectural aluminum-plastic panel curtain wall has been developed in the past 30 years, and is mainly used in the building facades of large shopping malls, convention centers, and high-rise office buildings. The building aluminum-plastic panel curtain wall is that the manufacturer pre-coats fluorocarbon, acrylic, silicone acrylic, epoxy or polyurethane paint on the aluminum-plastic panel, and the construction unit makes keels on the outer wall of the building, and installs the aluminum-plastic panels by rivets. curtain wall. The disadvantages are: high production cost; uneven force on the fixed point of the plate, or deformation and arching caused by thermal expansion and contraction of the plate, which may easily cause the a...

AI Technical Summary

Problems solved by technology

The disadvantages are: high production cost; uneven force on the fixed point of the plate, or deformation and arching caused by thermal expansion and contraction of the plate, which may easily cause the aluminum-plastic panel to fall off from a high altitude, which is dangerous and affects the safety of ground personnel; Plates are not easy to repair due to problems such as oxidation, discoloration, and blackening

[0014] The shortcomings in the above application: (1) Invention CN201410370400.1, the metal paint emulsion prepared with deionized water as diluent is more environmentally friendly water-based glitter paint, but the shortcomings: a, water is relatively dispersible to water-based resins and pigments Poor, which affects weather resistance; b. During construction, due to the high surface tension of water, the wettability and spreadability of the substrate surface are poor, so that the coating film is prone to shrinkage and needle bubbles, which affects the quality and appearance; c. When spraying, water-based flash paint is more likely to sag than solvent-based flash paint; d. When spraying, water-based flash paint has poor dispersion stability against strong mechanical forces. When the flow rate in the pipeline changes sharply, the aluminum powder particles are compressed into Solid particles cause pitting on the paint film; e. The adhesion and hardness of the paint film are poor for a long time, the color retention of the paint film is poor, and the paint film is easy to fade and fall off

(2) Solvents or diluents used in inventions CN201010558793.0, CN201410370400.1 and CN201410018802.5 include: methanol, xylene, and benzene, which are not only poisonous solvents, but also harmful to the human body. Dried into a film, the volatilized solvent will further participate in atmospheric photochemical reactions, causing pollution to the environment; and from January 1, 2018, they will be listed as taxable air pollution in the "Environmental Bonded Law of the People's Republic of China" substances, the use of these solvents will be taxed, thus reducing the competitiveness of the product

(3) Inventions CN201010558793.0, CN201210248463.0 and CN201410370400.1 use silver powder as a pigment. When the silver powder particles are exposed to the air, they are prone to oxidation, resulting in black and gray paint surface and affecting the appearance of the paint film.

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