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News > Dynamic industry > Over polyester

Over polyester

Abstract: the structure of the hyper - based polyester is between the linear and the spherical, the viscosity is very low, and the high - density functional groups of the high - density have the high reactivity.. Polyester is an ideal powder coating resin. In this paper, the synthesis, modification, structure and properties of the over - oriented polyester are reviewed.. Elaborated
Characterization and testing method of over - oriented polyester. The application examples of the super polyester in powder coatings are introduced..
1, preface
In recent years, powder coating due to the advantages of its product quality and environmental protection become the current paint development one of the important directions of, it has gradually replaced the traditional liquid coating, but powder coatings are high curing temperature, large energy consumption, and the bottom of the thermal material construction cannot be used. In order to improve the performance of powder coatings has useful resin crystallization and amorphous resin mixed to make powder coating, so that the low temperature curing and good leveling property and long storage also not caking, however, by different resin mixed into the powder coating due to compatibility problems resulting in coating and the mechanical properties decreased, if the amorphous and crystalline structure into the same resin molecules undoubtedly in the preparation and properties of has advantages. Hyperbranched polyester because of its three-dimensional structure is difficult to closely spaced, most exists in amorphous, and highly branched molecular chains exist abundantly available for modification of the end groups, through the connected technology of long chain molecules can improve the crystallization properties. The utility model hyperbranched polyester melt viscosity is low, made of powder coatings can be applied to the surface coating of various metals and non metals. In addition, they can also at low temperature, or the use of optical radiation such as UV and EB curing, powder coating film hard, strong anti impact properties. With the development of polymer science, especially understanding the structure and properties of the polymer, with special molecular structure, unique properties and wide application prospects of the hyperbranched polyester "has received great attention from both academia and industry.
2, polyester
Highly branched polymers are divided into two categories: monodisperse dendrimers and polydisperse hyperbranched polymers, the repeat unit of the former contains a supporting point, the molecular chain are from a central core of divergent growth apart. From the definition, the branched polymer has a "perfect" structured structure (branching degree DB=1), and each repeating unit contains at least one branching point and molecular weight distribution is uniform.. However, the structure of the polymer is irregular, and the molecular weight of the structure is very large and the molecular weight is released..
In order to obtain the precise molecular structure, dendritic polymers usually must by the multi-step continuous synthesis, every step of the synthetic Chengdu to after separation and purification operation. The process is very tedious, compared with, hyperbranched polymers can through a step or quasi one step synthesis method, steps to reduce, and obviously reduces the cost, although its molecular structure integrity as dendritic polymer, but its nature but with dendrimer molecules have many similarities, which makes the hyperbranched polymers in industrial applications in a more favorable position, especially as the application of resin coating.a

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