Marine anticorrosive powdered paint and preparation method thereof

Abstract

The invention provides marine anticorrosive powdered paint and a preparation method thereof. The formula of the paint comprises polyethylene, glass flakes and zinc powder, wherein the polyethylene is one or a combination of low-density polyethylene (LDPE), medium-density polyethylene (MDPE) and high-density polyethylene (HDPE); the glass flakes are scalelike glass flakes which are 40-3000 meshes; and the glass flakes are made of alkali glass or neutral glass. According to the invention, the glass flakes and the flaky zinc powder are added in the polyethylene (PE) base, so that glass layers and zinc layers having good barrier effect are distributed in the PE powder, wherein the glass layers can resist acid, alkali, salt and water, and the scalelike glass flakes can form multiple barrier layers in the PE layer. Thus, corrosive small molecules pass through the barrier layers as if passing through a maze and need to travel on a long and tortuous road, thereby improving the anticorrosive effect.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a marine anti-corrosion powder coating and a preparation method thereof. Background technique [0002] In the process of ocean development and utilization, humans have built many large offshore structures. Considering the engineering cost and comprehensive performance of materials, most of these offshore structures are made of carbon steel and low-alloy steel with high strength, high toughness and low price. Usually, the design life of large-scale marine engineering structures ranges from 20-30 years to 40-50 years. In order to ensure the safe service of these steel structures, effective protective measures must be taken. [0003] At present, for the anti-corrosion design of large-scale marine steel facilities, organic coatings are generally applied to the water area, and cathodic protection technology is used in the underwater area. Because the organic coating is easy to age,...

AI Technical Summary

Problems solved by technology

The use of PE powder coatings as heavy-duty anti-corrosion powder coatings is not currently available on the market. The main obstacle is that PE has high water permeability and air permeability. Even if the PE layer is intact, the molecular gap of PE is large, and small corrosion molecules can penetrate these molecules. gaps, thereby contacting the base metal that is supposed to be protected

Therefore, the anti-corrosion life of PE powder coatings is not too long, especially for acid, alkali, salt and other highly corrosive anti-corrosion effects. Therefore, ordinary PE powder coatings cannot be used as heavy-duty anti-corrosion powder coatings such as marine.

At present, the high-grade marine anti-corrosion powder used in China is mainly imported, because the anti-corrosion life of domestic self-produced marine anti-corrosion powder coatings is generally only 5 years, and even less than 1 year in harsh environments