Electrostatic Spraying for Container Houses

Electrostatic spraying for container houses is a technology that utilizes the principle of electrostatic adsorption to uniformly coat powder coatings on the surface of containers, which are then cured at high temperatures to form a dense coating. This technology is characterized by environmental friendliness, high efficiency, and excellent coating performance.

Process Principles and Advantages

Electrostatic spraying charges the coating powder through a high-voltage electrostatic field, causing it to be adsorbed onto the grounded surface of the container, forming a uniform coating. Its core advantages include:

• High powder utilization: Relying on the electrostatic wrapping effect, powder utilization can reach over 95%, significantly reducing material waste.
• Excellent coating performance: The coating's corrosion resistance far exceeds that of traditional solvent-based coatings, with salt spray resistance reaching up to 2000 hours and weather resistance improved by 30%. It can ensure no rusting for 5 years even under equatorial sun exposure.
• Outstanding environmental benefits: Zero VOCs and zero solvent emissions. Based on a production capacity of 3 million TEUs, it can reduce VOC emissions by 14,000 tons, paint wastewater by 703,000 tons, and waste paint residue by 51,000 tons annually, while reducing carbon emissions by 802,000 tons.
• Improved process efficiency: One-step forming eliminates the need for multiple drying processes. The coating time for a single container is reduced from 4-5 hours in traditional processes to 1.5-2 hours, with a rework rate of less than 1% and an annual production capacity increase of 50%.

Technological Applications and Breakthroughs

• Container-specific powder coatings: The container-specific powder coatings developed by Jitai have overcome industry challenges such as uneven heating and poor curing of thick plate edges and corners, making them suitable for the internal and external coating of 20-foot/40-foot standard dry cargo containers, 53-foot North American containers, and special containers.
• Fully automated spraying process: The world's first 53-foot powder-coated container showcased by Xinhui CIMC adopts a fully automated powder coating process for the entire container, with coating quality comprehensively superior to that of water-based polyurethane paint, marking an important milestone in the industry's green upgrade.
• Coating performance verification: International container coating testing requires passing the IICL standard of the American KTA Laboratory, including three aspects of testing: corrosion resistance, mechanical properties, and weather resistance. The powder coatings meet all requirements.

Industry Development Trends

With stricter environmental regulations, the container manufacturing industry is accelerating its transition from solvent-based coatings to powder coatings. Electrostatic spraying technology, with its advantages of environmental friendliness, high efficiency, and excellent coating performance, has become the mainstream direction for green development in the industry, with broad market prospects in the future.