A solvent-free internal drag-reducing coating and its preparation method

Abstract

The invention discloses a solvent-free internal drag reducing coating and a preparation method thereof, and belongs to the technical field of coating chemical industry. The coating is composed of a component A and a component B. The component A comprises the raw materials in parts by weight: 1 part of epoxy resin, 0.1-0.4 part of modified flexible epoxy resin, 0.1-0.2 part of a toughening agent 0.1-0.15 part of an active diluent, 0.01-0.02 part of a defoaming and de-aeration agent, 0.01-0.03 part of a leveling agent, 0.02-0.03 part of a dispersant, 0.01-0.1 part of a thixotropic anti-settlingagent, and 0.5-0.9 part of corrosion-resistant pigments and fillers. The component B comprises the raw materials in parts by weight: 1 part of modified polyamide resin, 0.1-0.3 part of modified aromatic amine resin, 0.02-0.06 part of a curing agent, 0.01-0.05 part of a dispersant, 0.01-0.05 part of a thixotropic agent and 0.4-0.9 part of corrosion-resistant pigments and fillers. The weight ratio of the component A to the component B is 1 to (0.8-0.9). The coating can meet the requirements of thin coating property, flexibility, short-term heat resistance and salt spray resistance property at the same time.

Description

technical field [0001] The invention relates to the technical field of coating chemical industry, in particular to a solvent-free internal drag-reducing coating and a preparation method thereof. Background technique [0002] The drag-reducing coating in the gas pipeline can greatly reduce the friction coefficient of gas transmission, increase the gas transmission volume, and improve the transmission efficiency while it has an anti-corrosion effect on the metal pipeline. be applied on a large scale. At present, solvent-based internal drag-reducing coatings are mostly used in large-scale gas pipelines. However, solvent-based coatings have the problems of being harmful to the human body, polluting the environment, and wasting solvents. Solvent-free coatings are often suitable for thick coatings due to their high viscosity. Coating, it is difficult to obtain a thin coating with good appearance, and the molecular chain length of the main film-forming resin is short, and the flex...

AI Technical Summary

Problems solved by technology

At present, solvent-based internal drag-reducing coatings are mostly used in large-scale gas pipelines. However, solvent-based coatings have the problems of being harmful to the human body, polluting the environment, and wasting solvents. Solvent-free coatings are often suitable for thick coatings due to their high viscosity. Coating, it is difficult to obtain a thin coating with good appearance, and the molecular chain length of the main film-forming resin is short, and the flexibility and heat resistance are poor

Solvent-free coatings will become the development trend of internal drag-reducing coatings, but the existing solvent-free coatings cannot meet the requirements of thin coating, flexibility and short-term heat resistance of internal drag-reducing coatings at the same time. Coatings have high requirements on salt spray resistance and salt water immersion resistance, so the performance of drag-reducing coatings in steel gas pipelines is gradually put forward higher and higher requirements

Images