A kind of novolac epoxy coating with chemical medium resistance and preparation method thereof

Abstract

The invention discloses phenol aldehyde epoxy paint with lasting electrical conductivity and a preparation method thereof, and belongs to the paint field. The phenol aldehyde epoxy paint comprises a component A and a component B, wherein the component A consists of the following components in percentage by mass of 20-60% of epoxy resin, 3-20% of phenol aldehyde epoxy functional modifier, 3-15% of reaction type epoxy diluents, 4-25% of solvent, 0.1-1% of anti-foaming agent, 2-10% of rust-proof pigment, 0.1-2% of coupling agent, 0.5-3% of functional thixotropic agent, 25-67% of modifying filler; the component B consists of the following components in percentage by mass of 97-99.5% of amine curing agents, 0-20% of solvent, 0.5-3% of coupling agent. Mass solids of the phenol aldehyde epoxy paint disclosed by the invention are over 95%, so that solid content is high; moreover, the rust-proof pigment is partly added for being used as rust-proof paint, and therefore, the phenol aldehyde epoxy paint has relatively good fog mist resistance and seawater resistance, satisfies interior-exterior anticorrosive coating, and the like of the conventional ship industry and the chemical plant, has relatively high performance for resisting chemical media such as acid-base, and the like, and particularly has thermal acid-base resistance.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of coatings, and relates to a novolac epoxy coating with chemical medium resistance and a preparation method thereof. [0003] 【Background technique】 [0004] It is well known that the medium with strong acid / alkali at a certain temperature, due to the very harsh corrosive environment, ordinary epoxy coatings are often unable to withstand, and the coating is prone to blistering and peeling during a short service period, which affects the corrosion resistance The effect is to shorten the service life of storage tanks, pipelines and other equipment. At present, for coatings that are stored, transported, and exposed to a series of strong corrosive media such as strong acids and strong alkalis, phenolic epoxy resins with higher cross-linking density are used for protection. [0005] After the recent promulgation and implementation of SY / T 0319-2012 "Technical Standards for Internal Anticorrosion Layers of Liquid C...

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Problems solved by technology

[0004] It is well known that the medium with strong acid / alkali at a certain temperature, due to the very harsh corrosive environment, ordinary epoxy coatings are often unable to withstand, and the coating is prone to blistering and peeling during a short service period, which affects the corrosion resistance effect, shorten the service life of storage tanks, pipelines and other equipment. At present, for coatings that are stored, transported, and exposed to a series of strong corrosive media such as strong acids and strong alkalis, novolac epoxy resins with higher cross-linking density are used for protection.

[0005] After the recent promulgation and implementation of SY / T 0319-2012 "Technical Standards for Internal Anticorrosion Layers of Liquid Coatings for Steel Storage Tanks", the acid / alkali resistance performance indicators of liquid phenolic epoxy coatings have been further improved, among which the resistance to chemical media (10% sulfuric acid , 10% sodium hydroxide) the temperature was raised to 60°C, and a series of requirements for temperature and pressure resistance were also put forward; most of the traditional novolac epoxy coatings on the market currently use monofunctional reactive diluents and do not add Novolac epoxy modifier, the product performance can no longer meet the stringent requirements of the standard for novolac epoxy coatings, therefore, it is very important to choose a novolac epoxy coating with chemical resistance

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