Coating classification: epoxy coating

Core tip: Introduction: epoxy coating is the coating with epoxy resin as the main film-forming material, also known as epoxy coating Epoxy coating is one of the four pillars of synthetic resin coating Epoxy resin is an important thermosetting resin Epoxy coating has been widely used in all walks of life due to its excellent anticorrosion performance, and plays an important role It mainly includes automobile industry, light industry, food processing, marine engineering, ship industry, power electronics, etc Performance characteristics: the performance characteristics of epoxy coating are as follows: ① Excellent chemical resistance of epoxy coating The outstanding advantage of cured epoxy resin is its chemistry Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Home of coatings: brief introduction: epoxy coating is a coating with epoxy resin as the main film-forming material, also known as epoxy coating Epoxy coating is one of the four pillars of synthetic resin coating Epoxy resin is an important thermosetting resin Epoxy coating has been widely used in all walks of life due to its excellent anticorrosion performance, and plays an important role It mainly includes automobile industry, light industry, food processing, marine engineering, ship industry, power electronics, etc Performance characteristics: the performance characteristics of the epoxy coating are as follows: ① the outstanding advantages of the epoxy resin with excellent chemical resistance and curing are its stable chemical properties, alkali resistance and oil resistance This is because there is no ester bond in the epoxy resin, the aliphatic hydroxyl contained in the epoxy resin does not react with alkali, and the solidified product is a three-dimensional network structure Therefore, epoxy coating is often used as anticorrosive coating But the acid resistance of epoxy coating is generally poor ② Epoxy coating has strong adhesion, especially for metal (steel, aluminum), ceramics, glass, concrete, wood and other polar base materials The reason is that epoxy resin has strong polar ether and hydroxyl groups, and has strong interaction with the base material interface ③ The high strength and toughness of epoxy coating is due to the presence of benzene ring in the epoxy resin; the good toughness is due to the presence of ether bond in the epoxy resin, which endows it with the ability of internal rotation of molecular chain, and is not easy to brittle fracture ④ The cured epoxy resin with good electrical insulation shows excellent insulation Its electrical performance is 35-50 kV / mm at room temperature, and its volume resistance is 1013 Ω· cm ⑤ The heat resistance of epoxy coating is generally 80-100 ℃, some of which are as high as 200 ℃, or even higher ⑥ The curing shrinkage of epoxy coating is small, stable and not easy to crack Generally 1% - 2% 8% - 10% for phenolic resin, 4% - 6% for unsaturated polyester resin and 4% - 8% for organosilicon resin ⑦ The aromatic ether bond of epoxy resin cured by poor photo aging of epoxy coating can degrade and break under the irradiation of ultraviolet light, so it has poor weather resistance The paint film cured by bisphenol-A epoxy resin is easy to be powdered and lose light in outdoor, so it is not suitable for outdoor coating But heterocyclic and aliphatic epoxy coatings can be used outdoors ⑧ The general curing temperature of low temperature curing epoxy resin is 10 ℃, otherwise the curing is slow Generally, it is not suitable to construct under 10 ℃, which makes it difficult to construct large outdoor objects in winter Classification: ① self drying epoxy coating single component, two-component and multi-component liquid coating; two-component room temperature drying coating accounts for the majority Two component coating is a kind of coating which is packaged by two components separately One component is the main film-forming material, the other is curing agent, cross-linking agent, initiator, etc Before construction, the two components shall be evenly mixed according to the specified proportion, generally used up within 8-24 hours of construction time, and can be dried at room temperature This kind of epoxy coating includes polyamine (aliphatic amine, aromatic amine, cycloaliphatic amine) curing epoxy resin coating, polyamide resin curing epoxy resin coating, amine additive curing epoxy resin coating, amine curing epoxy asphalt coating, amine curing solventless epoxy resin coating and polyisocyanate curing epoxy resin coating ② One component, two-component solid-state or liquid coating of drying type epoxy coating; drying type coating refers to the coating which can be dried into film only after the coating has been baked to the specified temperature In the baking process, the active group or functional group in the epoxy resin reacts with the curing agent to form a film This type of coating is characterized by more rigorous molecular structure, better mechanical properties, chemical resistance and durability than natural dry coating Single component drying coating accounts for the majority This kind of epoxy coating includes epoxy phenolic resin coating, epoxy amino resin baking coating, epoxy / closed polyisocyanate coating, epoxy amino alkyd baking coating, powder coating (epoxy / dicyandiamide coating, epoxy / substituted dicyandiamide coating, epoxy / acid polyester powder coating, TGIC / acid polyester powder coating), other epoxy resin coating (linear epoxy resin coating, waterborne epoxy tree Grease paint) ③ Radiation curing coating liquid coating modified by epoxy resin It can be divided into three categories: construction, industrial and special There are building coating, automobile coating, ship coating, wood coating, machine coating, sign coating, electrical insulation coating, conductive coating, drug-resistant coating, anticorrosive coating, heat-resistant coating, fireproof coating, temperature indicating coating, lubricating coating, ablative insulation coating, food tank head coating and flame retardant coating, etc The construction methods include epoxy coating for spraying, epoxy coating for roller coating, epoxy coating for flow coating, epoxy coating for dip coating, epoxy coating for electrostatic construction, epoxy coating for electrophoresis construction, epoxy coating for powder flow construction and epoxy coating for brush coating The curing agent can be classified as amine curing epoxy coating, anhydride (or polyacid) curing epoxy coating, ion initiated curing epoxy coating and synthetic resin curing epoxy coating According to the coating state, there are solvent-based epoxy coating, high solid content (less solvent) epoxy coating, liquid solvent-free epoxy coating, powder type epoxy coating and water-based (water emulsion and water-soluble) epoxy or epoxy modified coating New varieties of epoxy coating: from the development of epoxy coating at home and abroad, there are five main new products of epoxy coating: anti-static coating of epoxy resin, anti mildew and environmental protection epoxy resin coating, reinforcement epoxy resin coating, one component modified epoxy resin antirust coating, epoxy resin water-based coating At present, the main direction of epoxy coating is high solid content, solventless and water-based In addition, ultra thin film, low temperature curing below 100 ℃ and high temperature rapid curing are the development trend of epoxy coatings in the future Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,