Composite coating and preparation method thereof

Abstract

The invention discloses a composite coating. The composite coating comprises the following components in parts by weight: 40-50 parts of fluorocarbon resin, 0.5-2 parts of graphene, 0.5-1 part of polyamide rheological agent, 5-15 parts of modified phosphate, 0.5-2 parts of dispersing agent, 0.5-2 parts of coupling agent, 5-10 parts of modified resin and 10-20 parts of solvent. The following two technical problems are mainly solved: I. the functions of the primer and the top coat are unified and the aim of convenience in construction is achieved; and II. graphene is used as a functional filler to achieve the function of high barrier, so corrosive media are difficult to permeate substrates, thus improving the salt spray, chemicals, weather and damp heat resistance of the coating.

Description

Technical field [0001] The invention belongs to the field of coatings, and particularly relates to a composite coating and a preparation method thereof. Background technique [0002] Aluminum alloy is an important metal material developed in modern times. Aluminum alloy has the advantages of high strength, low density, strong electrical and thermal conductivity, excellent mechanical properties, and good workability. It is widely used in the chemical industry, aerospace industry, and automobile manufacturing. Industry, food industry, electronics, instrumentation and marine shipbuilding industry. However, like other metals, aluminum alloys also face serious corrosion problems. Although under natural conditions, a natural oxide film with a thickness of about 4nm is easily formed on the surface of aluminum alloys, but this film is porous, uneven, and has poor corrosion resistance. , It is difficult to resist corrosion in harsh environments. [0003] In the prior art, anti-corrosion i...

AI Technical Summary

Problems solved by technology

[0005] However, in the actual use of this patent, the following defects still exist: 1. The coating in this patent is mainly used as a topcoat, and cannot be used in combination with a primer and a topcoat, and there is a defect that the coating process is complicated

2. During the preparation process of this patent, two ultrasonic dispersions and at least three stirring and mixing are required, and the production process is relatively complicated

Moreover, the time for ultrasonic dispersion and stirring and mixing is relatively long each time. If each step is carried out sequentially during the preparation process, it will take about 13 hours to complete the preparation of the coating, and its efficiency is extremely low.

In addition, in the actual large-scale production, the operability of graphene to disperse with ultrasonic waves is not strong