How to reduce VOC emissions during spraying operations

For traditional solvent based paints, VOC emissions can be reduced by increasing the solid content of the coating. An environmentally friendly spray gun can also be used to advance the power transmitted by the coating, thereby reducing VOC emissions by reducing the rebound of the coating.

The emergence of water-based paint

With the continuous development of spraying technology and the increasingly severe restrictions on VOC emissions in various countries, water-based paints and specialized spraying equipment for water-based paints have emerged. Almost all multinational coating companies have now listed the research and development, production, and promotion of water-based coatings as important development strategies.

1、 The primary strengths of water-based paint

(1) Lower cleaning costs

It is necessary to use organic solvents for cleaning the spray gun using solvent based paint, and the used cleaning agent cannot be recycled at all.

The spray gun using water-based paint only requires ordinary water to complete the entire cleaning process, and 90% of the cleaning water can be recycled, which not only saves the cost of purchasing cleaning agents, but also effectively reduces VOC emissions.

(2) Less organic solvent content

The organic solvent content in water-based paint is only 10%, while the organic solvent content in solvent based paint is as high as 80%. Therefore, the VOC transpiration of solvent based paint during the spraying process is much higher than that of water-based paint.

(3) Beneficial to human health

Less VOC emissions from water-based paint can significantly reduce the risk of health damage to spray painting workers.

(4) Meeting the environmental requirements of various countries

The VOC content of water-based paint conforms to relevant laws and regulations of various countries, which can prevent legal disputes that enterprises or individuals may face.

2、 Development trend of domestic water-based paint shopping malls

In the field of sedan repair paint, the consumption of water-based repair paint will adhere to an annual growth rate of 20% to 30% in the future, gradually replacing oil-based paint is an inevitable trend. "The" White Paper on the Technology and Application of Waterborne Repair Paint in China "conducted a forward-looking analysis, and it is predicted that the overall volume of repair paint businesses in China will expand year by year in the coming years. Compared with other countries, China's water-based paint market has the fastest growth rate and is expected to become the most important international water-based repair paint market in the future.

Since 2013, water-based repair paint in China has initially entered a period of rapid growth, and is now mainly used in developed regions and high-end shopping malls such as 4S stores. From the current trend, the application of water-based coatings will be promoted from high-end shopping malls to mid-range shopping malls. In addition, water-based coatings will have more diverse demands in terms of color, and their colors will be more diverse. The technology will also be more accustomed to the development trend of the sedan industry.

3、 Common questions and answers in the promotion of water-based paint

Because there are certain differences in the requirements and application methods for related equipment between water-based paint and solvent based paint, it can easily lead to confusion in concepts. Here are some common questions and related answers about the use of water-based paints.

(1) Is there any change in the operating habits of water-based paint?

Answer: Water based paint only has certain differences in equipment usage and has almost no impact on operating habits.

(2) Will using water-based paint add cost?

Answer: Water-based paint can achieve high-quality spraying results with fewer coatings, which not only shortens the spraying time but also reduces the amount of paint used.

(3) Is the monotony of water-based paint slower?

Answer: Waterborne paint does not require interlayer flash drying time. When the first coat of paint is not yet dry, it can be continued to be applied and the working hours can be shortened. With specialized monotonic equipment (such as a hair dryer), the monotonic speed of the entire painting can be fully advanced.

(4) Is it difficult to convert water-based paint spraying equipment?

Answer: The conversion from solvent based paint to water-based paint is simple, requiring only minor adjustments to equipment and process, such as replacing air caps and equipping blowers.

(5) Will the use of water-based paint reduce the spraying power?

Answer: As long as the coating manufacturer's instructions are strictly followed and professional supporting equipment is used, the overall spraying power of water-based paint is no less than that of solvent paint.

5. Three Elements of Waterborne Paint Spraying

A perfect water-based paint spraying requires satisfaction with three elements: high-quality water-based paint, advanced spraying materials, and clean compressed air. Pay attention to the following aspects for detailed requirements.

(1) When mixing paint, it is necessary to strictly follow the composition ratio recommended by the paint manufacturer.

(2) When selecting water-based paint spray guns, it is important to allocate appropriate air caps and nozzles.

(3) It is necessary to maintain a stable air pressure during spraying (refer to the recommended air pressure of the spray gun manufacturer).

(4) Use clean compressed air as the air source for the spray gun (advocating the use of high-precision oil-water separators).

(5) Equipped with a dedicated hair dryer to accelerate the monotonous speed of water-based paint.

The environmental characteristics of water-based paint itself are very suitable for the trend of low-carbon car repair work. Although the country has not officially announced laws and regulations to promote water-based paint, and the comprehensive application of water-based paint still needs some time, major car companies and paint companies have become accustomed to the global environmental trend and actively promote water-based paint products in China.

Article source: Qingyuan Automotive Repair Paint http://www.jinliangxincai.com/