Effective application of hyperbranched polyester resin in the coatings.
(1) hyperbranched polyester application in high-solids content coating.
Compact molecular structure, three-dimensional spherical structure, not easy to tangle between moleculars, compared with same molecular weight linear polymers, its solution has low viscosity at a higher solids content. (2) hyperbranched polyester application in the UV curable coating. Introducing hyperbranched polymer into the UV curing system, can overcome some of the disadvantages of linear oligomers, such as severe shrinkage of film, diluent volatilizing, toxicity, etc.
Thermosetting hyperbranched polyester with hydroxyl end groups, can control the crosslink density through the introduction of non-active/reactive end group. Light-curing coatings with acrylated polyesters, without adding photoinitiator, at a low intensity of UV irradiation, can cure film, and the film hardness, resistance to acetone, scratch resistance is good. (3) hyperbranched polyester application in powder coating.Powder coatings has disadvantages such as high curing temperature, large energy consumption, as well as not applied to heat-sensitive substrates.By introducing the hyperbranched polymer can overcome this disadvantage. Powder coatings generally cure time is 10 ~ 30 min, temperature is 170 ~ 200 ℃, which limit the powder coating application in the film substrate and heat sensitive substrates.The UV-curable powder coatings make up for this shortcoming, it can be used for heat-resistance substrate, low temperature curing, good fluidity, fast curing, etc. Weihai CY Dendrimer Technology Co. Ltd. -Professional Manufacturer for low cost dendritic polymers.