Expert Revealed: Epoxy Modifier

China Coatings Online News Information
Take HELOXY as an example of RESOULTOIN (formerly Shell) product 5434, China Coatings Onlineexperts, recently specifically answered the problem of epoxy modifiers. HELOXY epoxy activity modified contains one or more epoxy groups that are involved in the reaction of epoxy resins and curing agents to reduce epoxy viscosity to improve manoeurability and application, and to improve the mechanical properties, adhesion and flexibility of curings. Diluents can be divided into active and inactive thinners, the usual solvents are called inactive thinners, they do not react with epoxy resin, curing agent, pure physical doping, with curing reaction and volatilization, so will leave pores in the tree curing, so that the shrinkage increases, in severe cases will affect the performance of the curing, so can not be used for thick coating. Although there is also the use of high boiling point liquid ,----- plasticizers such as phthalates, trimethyl phosphate and other substances, but there is a tendency to migrate and seep out, especially after immersion in liquids and solvents extraction phenomenon is very obvious, and the larger surface pressure will seriously affect the leveling of the material and surface fruit. Regarding the classification of HELOXY epoxy modifiers, experts said that epoxy reactive thinners are divided into monocentr oxides and polyenoxidants, which are divided into fat and aromatic groups according to their type; The fat family type has a better dilution effect than the aromatic family type, while the aromatic family type has better acid resistance and alkalinity.
heloxygen modifier name is usually based on its chemical molecular form, such as H61 is often called BGE, because its chemical name is N-butyl shrink glycery ether. H63 is often referred to as PGE, because its chemical name is benzene shrinking glyceline ether, this naming method is very necessary to distinguish the same type of products from different manufacturers, the main differences between the same type of products are: product purity, free epoxy chloropropane content, residual alcohol content, and intermediate product content, these different substances have a very significant impact on product performance. According to China Coatings Onlineexperts, usually we only need one epoxy modifier in coating applications, so how to effectively choose a suitable modifier as needed is very necessary, we list 16 KINDSY epoxy modifiers and epoxy resin EP ON 828 curing properties in the same added ratio (HELXY:828:20:80) and TETA (triethylene tetraamine), including viscosity, mechanicality, acidity and alkalinity resistance, thermal variant temperature, etc. Generally speaking, the dilution capacity of monocycic oxygen reactive modifiers is greater than that of polycycline reactive modifiers, while polyethycline reactive thinners have better performance in maintaining epoxy products, and the adhesive ability of adipose group monocycic oxygen reactive thinners such as H61, H7 and H8 is particularly prominent.
HELOXY epoxy modifiers relative to the unaltered system usually extend the gel time of the mix, usually the reaction activity of the adipose epoxy modifier is low, such as H8 can very significantly increase the collation time of the mix, and the aromatic family has a small impact on the gel time, in addition to the chemical type of molecular weight will also affect the reaction activity, low molecular weight epoxy modifier reaction activity is higher. Regarding the thermodynamic properties of HELOXY epoxy modifiers, this expert first introduced the thermal variant temperature (HDT) - the critical temperature at which objects are subjected to heat to begin to change is an important index to measure epoxy curing agents, because of the high cross-link density of polyenoxygen modifiers, the thermodynamic properties are smaller than monoenoxygen modifiers, and aromatic modifiers have a better rigid structure, so the thermal performance of fat modifiers is smaller. The effect of HELOXY epoxy modifier on mechanical properties and thermodynamic properties are the same: polycycline modifiers cross-link density is high, so it is better than single epoxy modifiers mechanical properties, aromatic modifiers because of their good rigid structure and therefore better mechanical properties than fat family modifiers, long molecular chain modifiers such as H8 have good toughening ability, which improves the rigidity of epoxy products, low toughness is very good. HeLOXY epoxy modifiers have the same effect on chemical properties as the mechanical properties of thermodynamics, of course, some studies have pointed out that water resistance also depends on hydrocarbon-based content and molecular polarity, and acid-resistant alkalinity is mainly related to the quality of curing agents.
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