Powder paint resistant to high temperature and cathodic disbonding

Abstract

The invention discloses a type of powder paint resistant to high temperature and cathodic disbonding. The paint comprises, by weight, 55 parts to 75 parts of epoxy resin, 40 parts to 50 parts of novolac epoxy, 22 parts to 30 parts of polyester resin, 1 part to 2 parts of curing agent, 7 parts to 9 parts of carbon black, 0.5 part to 1.5 parts of antioxidant 168, 5 parts to 7 parts of mica powder, 0.1 part to 0.8 part of flatting agent, 2 parts to 4 parts of benzoin, 1 part to 5 parts of barium sulfate, 3 parts to 6 parts of titanium dioxide, 0.1 part to 0.5 part of preservative, 2 parts to 3 parts of zinc borate, and 5 parts to 10 parts of antimonous oxide. According to the powder paint resistant to high temperature and cathodic disbonding, epoxy resin, novolac epoxy and polyester resin are adopted and have the synergistic effect; because preservative is adopted, the corrosion resistance of the paint is improved; because zinc borate and antimonous oxide are adopted as fire retardant, the paint has excellent high temperature resistance, and has excellent cathodic disbonding resistance under high temperature; because mica powder and barium sulfate are adopted as filler, the strength of the filler is improved.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a high-temperature-resistant and anti-cathode stripping powder coating. Background technique [0002] In order to ensure the long-term reliable operation of buried metal pipelines in harsh environments, in addition to using thick-coated epoxy powder coatings with good anti-corrosion effects for protection, a polyethylene protective layer with high mechanical strength is added to minimize mechanical damage that may occur during transportation and construction. In addition, cathodic protection is also used. However, in an electrochemical corrosion environment, if the coating has low cathodic stripping resistance, the coating will degrade and crack, and lose its anti-corrosion effect. [0003] The electrochemical corrosion rate under cathodic protection conditions has a great relationship with the temperature environment used. The higher the temperature, the faster the corr...

AI Technical Summary

Problems solved by technology

However, in an electrochemical corrosion environment, if the coating has low cathodic stripping resistance, the coating will degrade and crack, and lose its anti-corrosion effect.

[0003] The electrochemical corrosion rate under cathodic protection conditions has a great relationship with the temperature environment used. The higher the temperature, the faster the corrosion rate. Therefore, the ability of the coating to resist cathodic stripping needs to be durable at high temperatures. In this way, the original powder coating Whether it is single-layer or three-layer powder coating, it is far from meeting the requirements