Anticorrosive inner coating film for inner layer of steel drum

Abstract

The invention belongs to the technical field of anticorrosive coatings, and relates to an anticorrosive inner coating film for an inner layer of a steel drum. The anticorrosive inner coating film mainly comprises the following components in percentage by weight: 60-70% of modified epoxy resin emulsion; 1-5% of a coalescing agent; 3-15% of anticorrosive pigment and filler; 2-8% of a surfactant; 4-10% of a coupling agent; 10-15% of a curing agent; 0.1-2% of a defoaming agent; 0.1-2% of a leveling agent; 0.1%-0.6% of a corrosion inhibitor; and 10-50% of water. The modified epoxy resin emulsion is adopted, so that a formed coating plays a role in physically shielding various corrosive media; the corrosion inhibitor is added, so that the corrosion rate of steel is greatly reduced; and a pigment and filler are modified to form the anticorrosive pigment and filler, the dispersity of the pigment and filler in epoxy resin is improved, and a phase interface between the pigment and filler and the resin is eliminated, so that the shielding property and the corrosion resistance of a colored paint film are improved on the premise of ensuring high hardness and high adhesive force of the paint.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, in particular to an anti-corrosion inner film used for the inner layer of a steel drum. Background technique [0002] Steel drums are one of the traditional containers and play an important role in traditional containers. The steel drum has evolved from the function of temporarily storing the contents to today's industrial packaging, sales packaging, transportation packaging, etc.; from production to circulation and consumption, it has formed a consistent flow container and has become a means of long-term preservation of the contents. It can be said that steel drums are the best for mankind. Work and life have brought great changes and progress. [0003] Although the application of steel drums has only a history of more than one hundred years, it has developed rapidly and has a wide variety. It is widely used in industrial product packaging, transportation packaging and sales pac...

AI Technical Summary

Problems solved by technology

In the particle coalescence stage, molecular rearrangement occurs, and polymer particles with similar polar groups tend to aggregate (while waterborne epoxy coatings must contain polar groups or hydrophilic groups), resulting in Polar groups form polar channels for water penetration, which accelerates water absorption in water-based coatings and reduces corrosion resistance. In order to increase the hardness of steel drums during the coating preparation process, various pigments and fillers are added. Pigments and fillers are generally difficult Uniform dispersion in water makes it easy to form a phase interface between coatings, giving an intrusion channel for intruding substances, making the metal substrate more prone to corrosion reactions, and steel drums often need to contain various acid-base salts and highly corrosive substances. The anti-corrosion performance of the inner wall of the steel drum is not well done, which has a great impact on the purity of the material in the drum and the safety of transportation