Composite epoxy powder coating for preventing automobile chassis from rusting and containing novel rheology controller and preparation method of composite epoxy powder coating

Abstract

The invention discloses a composite epoxy powder coating for preventing an automobile chassis from rusting and containing a novel rheology controller and a preparation method of the composite epoxy powder coating. A resin substrate compounded in the composite epoxy powder coating is good in associativity and membrane layer firmness; due to addition of ferrocene grafted propylene imine as a novel rheology controller, the rheology of the resin can be effectively improved, and the coating effect of the powder coating can be improved; and due to addition of aluminum triphosphate / polymethyl methacrylate microspheres as high-dispersity anti-rusting packing, an excellent anti-rusting effect can be achieved for the coating, and the defect that anti-rusting packing cannot be uniformly dispersed when being directly added can be avoided. The composite epoxy powder coating disclosed by the invention is outstanding in comprehensive property, a uniform, stable and flexible coated layer can be formed after the coating is rapidly cured, and thus the composite epoxy powder coating has great application potential in the field of protection and rusting prevention of the chassis.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to a composite epoxy powder coating containing a novel rheology control agent for rust prevention of 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 an...

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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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