High-adsorption polyester powder coating and preparation method thereof

Abstract

The invention discloses a high-adsorption polyester powder coating; beta-hydroxyalkylamide is used for replacing a TGIC curing agent, and has the advantages of low toxicity, low curing temperature, energy saving and environmental protection; after a vermiculite powder, nano titanium dioxide and black bamboo charcoal fibers are subjected to graft modification, dispersity and interface contact performance of the vermiculite powder, nano titanium dioxide and the black bamboo charcoal fibers in polyester resin are increased, so coatability, adsorption and self-cleaning performance of the coating are improved, and the staining resistance is increased; moreover, with addition of modified SAN resin, the mechanical properties of the powder coating are optimized; the prepared powder coating has the characteristics of excellent weatherability, high adsorption, higher raw material utilization ratio and the like; the prepared powder coating shows good liquidity and adhesiveness; and a formed coating layer is smooth, firm and tenacious, stable to light and heat, not prone to aging and cracking and durable in use, and more has market competitiveness.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a highly absorbent polyester powder coating and a preparation method thereof. Background technique [0002] Powder coating is a new type of solvent-free 100% solid powder coating. It has the characteristics of no solvent, no pollution, recyclable, environmental protection, saving energy and resources, reducing labor intensity and high mechanical strength of the coating film. Thermosetting powder coating refers to the use of thermosetting resin as a film-forming substance, adding a curing agent for crosslinking reaction and heating to form an insoluble and infusible hard coating. Thermosetting powder coatings have good leveling properties and strong decorative properties, and the low molecular weight prepolymers can form network crosslinked macromolecules after curing, so the coatings have good corrosion resistance and mechanical properties. , so the development of thermosettin...

AI Technical Summary

Problems solved by technology

[0005] However, the curing conditions of the polyester / TGIC system are harsh: TGIC is toxic, the curing temperature is high (>200°C), the curing time is long (10-30min), and the high curing temperature makes its energy consumption high and the baking time is too long , directly lead to longer production cycle, and labor productivity cannot be effectively improved

At the same time, the harsh curing conditions make powder coatings can only be used on heat-resistant metal substrates, and are not suitable for heat-sensitive substrates such as wood, paper, and plastics, which seriously restricts the application of powder coatings and needs to be improved. Production process and method