Steel Structure Corrosion - Classification of Corrosion Resistant Polymer Materials

Classification of Steel Structure Corrosion-Corrosion-Resistant Polymer Materials Synthetic resins are polymers obtained by polymerization (or polycondensation) of various monomers. The world currently produces a wide variety of resins, of which about 50-60 are important. Synthetic resins can be used to make plastics, adhesives, coatings, synthetic fibers, etc.
Synthetic resins used as anti-corrosion holidays must first have stable properties in chemical media, and at the same time have higher heat resistance, better physical and mechanical properties, and require simple construction and good process performance. The resin can meet the above requirements are roughly: phenolic resin, epoxy resin, unsaturated polyester and furan resin. There are many types of applications, including plastics, fiberglass, mastic, impregnants, and coatings.
(1) Phenolic resin Phenolic resin is a generic name for a class of resins obtained by condensation of phenols and aldehyde compounds in the presence of a catalyst. The phenolic resin is usually obtained by using phenol and formaldehyde as raw materials.
(2) Epoxy resin Epoxy resin is a type of organic polymer compound that contains two or more epoxy groups in the molecule. The molecular structure of epoxy resins is characterized by the presence of reactive epoxy groups in the molecular chain, and epoxy groups can be located at the end or in the middle of the chain. Due to the presence of reactive epoxy groups in the molecular structure, it can cross-link with various types of curing agents to form insoluble and infusible bulk polymers with three-dimensional structure. Because the epoxy resin structure contains some special groups, epoxy resin has a strong adhesion, it can bond a variety of metal, non-metallic materials.
(3) Unsaturated polyester Unsaturated polyester is a type of polyester resin that is commonly used in fiberglass and can be prepared by the esterification of dibasic acids with glycols or triols to produce unsaturation. Polyester. Unsaturated polyesters also contain unsaturated double bonds in their molecular structure, which can react with other unsaturated compounds in the presence of an initiator, crosslink and cure into a bulk structure, and can also be crosslinked and cured by crosslinks containing double bonds in themselves. In the curing process, an initiator, an accelerator, a polymerization inhibitor, a thixotropic agent, etc. are also needed to jointly complete the curing of the unsaturated polyester.
(4) Furan resin The resin containing a furan resin ring in its molecular structure is called a furan resin and mainly includes furfural resin, furfural-acetone resin and furfural-acetone-formaldehyde resin.
The cured furan resin has good acid and alkali resistance and can be used in acid, alternating mediums. Due to the presence of some double bonds in the furan resin molecules, it is easily oxidized, so it is not resistant to strong oxidizing media.
The cured furan resin has a very good tight network structure, making it have better solvent resistance and temperature resistance.
(5) Composite Resin In order to overcome the defect of a single resin, a composite resin was developed. Composite resins are two or more simple resins that are simply compounded or modified. The properties of the composite resin are different from those of the original resin, which can achieve the purpose of complementing each other. Common composite resins include: Base acrylic epoxy resin, bisphenol A polyester resin. At present, there are many forms of application of synthetic resin in anti-corrosion engineering. According to different needs and uses, according to different raw materials, curing agents, fillers, plasticizers, thinners and other auxiliary materials made of paint, cement, Impregnant and glass steel to use.