A kind of solvent-free epoxy coating and preparation method thereof

Abstract

The invention provides a solvent-free epoxy coating material and a preparation method thereof. The solvent-free epoxy coating material comprises a first component and a second component, wherein the first component comprises the following components in parts by weight: 1 part of bisphenol F resin, 0.8-1.0 part of bisphenol A epoxy resin E51, 0.1-0.2 part of liquid petroleum resin, 0.15-0.3 part of isomerous monocarboxylic acid glycidyl ester, 0.2-0.7 part of an anti-wear agent, 0.1-0.3 part of a dispersant, 0.02-0.1 part of an air-release agent, 0.01-0.1 part of a first slip agent, 0.05-0.1 part of a second slip agent, 0.05-0.1 part of a defoaming agent and 0.01-0.02 part of an anti-settling thixotropic agent; and the second component comprises the following components in parts by weight: 1 part of phenolic aldehyde modified aliphatic amine, 0. 8-1.2 parts of allylphenol modified alicyclic amine, 0.015-0.03 part of modified polyurea, 0.01-0.03 part of a dispersant, 0.1-0.3 part of iron oxide red and 0.15-0.35 part of anti-corrosion packing. A coating formed by the solvent-free epoxy coating material has an excellent thin-coating property, the one-step film-forming thickness of the solvent-free epoxy coating material can be equal to or less than 100 mu m, and the coating has high apparent quality.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a solvent-free epoxy coating and a preparation method thereof. Background technique [0002] In order to ensure the anti-rust and anti-corrosion of pipelines such as oil and natural gas transportation and reduce the transmission resistance of fluids in pipelines, special coatings are usually used; the research on drag reduction technology of internal coatings in pipelines began in the early 20th century and was widely used in long-distance transportation. Natural gas pipelines are in the 1950s. After decades of application development, the coating production and construction technology of pipeline inner coating is becoming more and more mature. In European and American countries with relatively advanced natural gas pipeline transportation technology, pipeline inner coating drag reduction technology has been widely used. Many large-diameter and long-distance natural gas pipelin...

AI Technical Summary

Problems solved by technology

The disadvantages of solvent-based coatings are: high VOC content, sensitivity to moisture in the environment, poor construction operability and paint storage stability, and easy foaming of the paint film. More importantly, solvent-based coatings are usually not environmentally friendly.

However, solvent-free coatings also have disadvantages. The more prominent one is that the coating has a high viscosity, which is not very convenient for construction, and the coating needs to be heated when spraying; due to the high viscosity, it is difficult to obtain a thinner coating, which is often suitable for thick coating.

When spraying, the thickness of the coating film is likely to exceed 120um, resulting in waste. When the thickness of the coating film is less than 100um, defects such as pits, pinholes, and orange peel are likely to appear on the surface of the coating

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