Mixed type powder coating and preparation method thereof

Abstract

The invention relates to a mixed type powder paint and a preparation method thereof. The mixed type powder paint is characterized by comprising 20 to 28 portions of epoxy powder composition and 20 to 80 portions of modified PE powder composition. The preparation method comprises the following steps: epoxy and curing agent are mixed according to the proportion, added with addition agent such as flatting agent, subjected to mixing and extrusion, and granulated; products are crushed by a plastic crusher into micropowder which is screened; components with 180 to 200 meshes are taken to prepare the epoxy powder composition; silane modified PE, curing accelerator, flatting agent and so on are subjected to mixing melt extrusion according to the proportion in a double screw extruder at a temperature of between 150 and 180 DEG C, crushed and screened; and components with 180 to 200 meshes are taken to prepare a crosslinked PE powder composition; the silane modified PE adopts moisture for curing; and the epoxy powder composition and the crosslinked PE powder composition are dispersed and mixed evenly according to a certain proportion to prepare the mixed powder paint, wherein the ratio of the epoxy powder composition to the crosslinked PE powder composition is 20-80 to 80-20. The mixed type powder paint has the advantages that the mixed type powder paint has super strong weather resisting property, has certain compatibility with the epoxy and integration of a surface layer and a bottom layer due to the modification treatment, can be cured by self under natural condition, and can also be steeped into hot water for accelerating the curing.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a hybrid powder coating and a preparation method thereof. Background technique [0002] Heavy-duty anti-corrosion coating is a kind of coating that can be used effectively for a long time in harsh environment. In order to achieve the purpose of heavy-duty coating, on the one hand, it is necessary to thicken the coating; The surface treatment and coating construction and maintenance requirements are also very strict. This type of paint used to be liquid paint, and usually requires multiple coats to meet the demand. [0003] In recent years, due to its safety, high efficiency, and pollution-free characteristics, powder coatings have taken an increasing proportion in the field of heavy-duty anti-corrosion, especially in the field of heavy-duty pipeline anti-corrosion. From the initial oil and gas pipeline anti-corrosion, it has expanded to urban underground sewage pipe network anti-c...

AI Technical Summary

Problems solved by technology

[0004] The development of heavy-duty powder coatings and the expansion of application fields also put forward many new requirements for the production of raw materials and the design of powder formulations. A single powder coating formulation can no longer meet the needs of different applications. Therefore, it is necessary to continuously develop new materials and Formulation technology

Although the output of powder coatings in my country is already huge, it is mainly decorative powder coatings. There are still very few powder coating formulations that really meet the requirements of heavy-duty anti-corrosion properties, and epoxy resin is mainly used as the first choice for heavy-duty anti-corrosion powder coatings. However, due to its resistance The chemical properties and heat resistance are not good enough, it is mainly used as a primer, and its use is greatly limited