Composite nano-montmorillonite complex modified epoxy anti-rust powder coating for automotive chassis and preparation method of composite nano-montmorillonite complex modified epoxy anti-rust powder coating

Abstract

The invention discloses a composite nano-montmorillonite complex modified epoxy anti-rust powder coating for an automotive chassis and a preparation method of the composite nano-montmorillonite complex modified epoxy anti-rust powder coating. The coating has good film forming effect, heat resistance, water resistance and corrosion resistance; added aluminium triphosphate / polymethyl methacrylate microspheres are high-dispersity anti-rust packing, the anti-rust performance of the coating is greatly improved, and the shortcoming of uneven dispersing caused by the reason that anti-rust packing is added directly is overcome. Composite nano-montmorillonite is a modified material doped with a phytic acid-poly(diallyldimethylammonium chloride) complex, therefore, the anti-rust and anti-corrosion capabilities of the coating are further improved, and the capability of protection on the surface of a metal material is quite high; and various raw materials in a formula are blended effectively, and finally, the composite epoxy powder coating which is high in curing speed, good in film forming effect, crush-resistant, crack-resistant, long-acting, stable and anti-rust is prepared, and has good application prospect in the field of rust protection of the chassis.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to a composite nano-montmorillonite complex modified epoxy-based antirust powder coating for automobile chassis and a preparation method thereof. Background technique [0002] The chassis of a car is an extremely important part of the car. Due to the complex environment in which the chassis is located, it has to withstand the erosion of temperature, rain, moisture, salt, etc., especially in recent years, the aggravation of environmental pollution has led to an increase in the acidity of rainwater, making The anti-corrosion of automobile chassis is becoming more and more important. Once the chassis parts become loose, it will directly affect the safety of the vehicle and the owner. The most conventional treatment method for chassis antirust is to spray antirust paint. At present, the mainstream products of antirust paint are oil-based antirust paint and water-based antirust p...

AI Technical Summary

Problems solved by technology

The most conventional treatment method for chassis antirust is to spray antirust paint. At present, the mainstream products of antirust paint are oil-based antirust paint and water-based antirust paint. Oil-based antirust paint is not environmentally friendly and has high toxicity; water-based antirust paint It can meet the requirements in terms of environmental protection, but its protection period is short and its use is limited. How to obtain long-lasting and environmentally friendly anti-rust coatings is the current research direction of the industry.

[0003] Due to its good environmental protection and excellent metal surface adhesion, thermosetting epoxy powder coatings have good application prospects in the rust prevention of automobile chassis parts. However, epoxy powder coatings have high curing temperature, high requirements for construction equipment, and flat film layers. In order to improve its comprehensive performance, it needs to do further research on its modification.

"Research on Preparation of Epoxy Acrylic Resin Low-Temperature Curing Transparent Powder Coatings" was compounded with acrylic resins with different epoxy equivalents, and bisphenol A epoxy polyester was used as a curing accelerator to obtain a solid coating at 150-160 °C. That is, the cured powder coating. Although the curing temperature of this coating is lowered, its mechanical properties are slightly worse, the curing time is longer, and the flatness of the film layer needs to be improved. Further modification

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