What details should be paid attention to during the painting process of elderly three-wheeled scooters

What details should be paid attention to during the painting process of elderly three-wheeled scooters

Introduction
With the intensification of the global aging trend, the market demand for elderly three-wheeled scooters continues to grow. For international wholesale buyers, ensuring the quality of painting of elderly three-wheeled scooters is the key. Good painting can not only improve the appearance of the product and extend its service life, but also reflect the care and respect for the elderly and enhance market competitiveness. This article will explore the key details in the painting process of elderly three-wheeled scooters.

1. Surface treatment before painting
Clean thoroughly: Use a suitable detergent to remove impurities such as oil, dust, stains, etc. on the surface. For example, alkaline cleaning agents can effectively remove oil stains. For example, for parts with stubborn oil stains, high-temperature alkaline cleaning agents can be used for spraying or soaking to ensure that the surface cleanliness meets the standard.
Rust removal: If there is rust on the surface of the vehicle body, sandblasting, grinding and other methods are required to thoroughly remove the rust. For example, using sandblasting equipment to spray abrasives onto the surface of the vehicle body at high speed to remove the rust layer and form a rough surface, which is conducive to the adhesion of the paint.
Surface smoothness: Check whether the surface of the vehicle body has defects such as unevenness, scratches, etc., and repair them if necessary. For example, for smaller scratches, putty can be used to fill them, and then polished and smoothed after drying.

2. Selection of coatings
Environmental protection: Choose coatings that meet international environmental protection standards, such as water-based coatings, high-solid coatings, etc., to reduce the emission of volatile organic compounds (VOCs). For example, water-based coatings use water as a diluent and do not contain organic solvents, which is harmless to the environment and human health.
Durability: Considering the use environment and frequency of elderly tricycles, the coating must have good weather resistance, corrosion resistance and wear resistance. For example, fluorocarbon coatings have excellent weather resistance and can resist erosion from natural factors such as ultraviolet rays, wind and rain for a long time; epoxy floor coatings have good wear resistance and are suitable for parts that often contact the ground.
Color matching: Select colors according to the physiological and psychological characteristics of the elderly. Elderly people are less sensitive to colors, so they are suitable for using stable neutral colors, such as black, white, and gray, and can also be matched with warm colors, such as beige and orange, to give people a warm and comfortable feeling.

3. Control of coating process
Spraying process: Spraying is one of the common coating methods. The following points should be noted:
Equipment debugging: According to the characteristics and process requirements of the coating, adjust the nozzle diameter, spray pressure, flow rate and other parameters of the spraying equipment. For example, for coatings with higher viscosity, the nozzle diameter and spray pressure can be appropriately increased to ensure that the coating can be sprayed evenly.
Spraying skills: When spraying, the distance between the spray gun and the surface of the vehicle body should be kept consistent, generally 15-20 cm; the spraying speed should be uniform to prevent sagging, leaking and other phenomena. A cross-spraying method can be used to improve the uniformity of the coating.
Coating thickness: Control the thickness of each coating. Generally, the primer thickness is 20-30 microns and the topcoat thickness is 30-50 microns. The dry film thickness can be estimated by measuring the wet film thickness to ensure that the coating meets the specified thickness requirements.
Brushing process: For some small parts or parts that are difficult to spray, the brushing process can be used. When brushing, pay attention to the following points:
Brush selection: Choose a suitable brush, such as a natural bristle brush or a synthetic fiber brush, according to the characteristics of the paint and construction requirements.
Brushing technique: When brushing, the movement should be brisk and avoid repeated brushing to avoid bubbles and brush marks. The “cross-cross” brushing method can be used to ensure uniform coating.

4. Control of the coating environment
Temperature and humidity: The temperature and humidity of the coating environment have an important influence on the drying and performance of the coating. Generally speaking, the ambient temperature of the coating construction should be controlled at 15-30 degrees Celsius, and the relative humidity should be less than 85%. For example, in a high temperature and high humidity environment, the paint will dry more slowly, and it is easy to have quality problems such as sagging and whitening.
Good ventilation: Ensure that the painting workshop has good ventilation facilities, exhaust harmful gases and solvent vapors in time, provide a healthy working environment for operators, and avoid gas accumulation causing safety accidents.
Cleanliness: Keep the painting environment clean to prevent dust, debris, etc. from falling on the surface of the wet paint film and affecting the quality of the coating. Air purification equipment, such as air purifiers, filters, etc., can be used to reduce the dust content in the air.

5. Drying and curing of coatings
Drying method: Select a suitable drying method according to the type of coating and process requirements. Common drying methods include natural drying and forced drying (such as hot air circulation drying, infrared drying, etc.). For example, for water-based coatings, natural drying or low-temperature drying can be used; for solvent-based coatings, hot air circulation drying can be used to increase the drying speed.
Drying time: Control the drying time of the coating to ensure that the coating is fully dried and cured. The drying time of different coatings is different. Generally, the drying time of primer is 0.5-2 hours, and the drying time of topcoat is 2-4 hours. During the drying process, the coating should be avoided from collision and friction.
Curing conditions: For some coatings that need to be cured, such as two-component coatings, the curing agent ratio and curing conditions provided by the manufacturer should be strictly followed to ensure that the coating achieves the expected performance.

6. Quality Inspection and Control
Appearance Inspection: The coating surface should be smooth and flat, uniform in color, and free of defects such as sagging, orange peel, and particles. A preliminary inspection can be carried out by visual inspection and touch, and any defects found should be repaired in a timely manner.
Thickness Detection: Use a dry film thickness gauge to detect the thickness of the coating to ensure that the coating meets the specified thickness requirements. For areas with insufficient thickness, re-coating should be carried out in a timely manner; for areas with excessive thickness, appropriate treatment should be carried out, such as polishing.
Adhesion Test: Use the cross-cut method or pull-off method to test the adhesion of the coating to the surface of the vehicle body to ensure that the coating has good adhesion and does not fall off or peel. If poor adhesion is found, the cause needs to be analyzed and corresponding measures need to be taken to improve it.
Corrosion Resistance Test: For coatings with corrosion resistance requirements, corrosion resistance tests such as salt spray tests can be carried out to evaluate the corrosion resistance of the coating. According to the test results, the coating formula and process are optimized to improve the corrosion resistance of the coating.

7. Maintenance and management of coating equipment
Equipment cleaning: Clean and maintain the coating equipment regularly to ensure the normal operation of the equipment. For example, clean the residual paint in the spray gun and paint pipe in time to prevent blockage; clean the filter screen and vents of equipment such as the spray room and drying room to maintain the cleanliness of the equipment.
Equipment calibration: Regularly calibrate and debug the coating equipment to ensure the accuracy and stability of the equipment. For example, calibrate the nozzle diameter, paint pressure, flow rate and other parameters of the spray equipment to ensure the consistency of the spray quality.
Equipment maintenance: Regularly maintain and repair the equipment according to the requirements of the equipment manufacturer. For example, replace the vulnerable parts of the equipment, such as the nozzle and seals of the spray gun; maintain the motor, pump and other parts of the equipment, add lubricating oil, etc., to extend the service life of the equipment.

8. Safety and environmental protection precautions
Safety protection: During the painting process, operators should wear corresponding safety protection equipment, such as masks, gloves, goggles, etc., to prevent the paint from causing harm to the human body. At the same time, safety warning signs should be set up to remind operators to pay attention to safety.
Fire prevention: Paint is a flammable and explosive item, so pay attention to fire prevention during the painting process. The painting workshop should be equipped with fire-fighting facilities, such as fire extinguishers and fire hydrants; smoking and using open flames in the painting area are strictly prohibited; the storage and transportation of paint must also strictly comply with safety regulations to avoid fire accidents.
Wastewater treatment: The wastewater generated during the painting process contains a large amount of pollutants such as organic solvents and pigments, which need to be properly treated. Physical and chemical methods can be used to treat wastewater, such as precipitation, filtration, oxidation and reduction, so that the wastewater can be discharged after reaching the discharge standard.
Waste recycling: For waste materials generated during the painting process, such as waste paint, waste filter screen, etc., they should be classified, recycled and treated. Waste paint can be recycled and reused, such as for painting of non-critical parts; waste filter screens can be harmlessly treated to reduce pollution to the environment.

9. Painting treatment of special parts
Frame welding parts: The surface roughness of the frame welding parts is large, and the adhesion of the paint is relatively poor. Before painting, the welding parts should be polished to remove welding slag and oxide scale, and then phosphating treatment should be carried out to improve the adhesion of the coating. When painting, the thickness of the coating can be appropriately increased to ensure the anti-corrosion performance of the welding parts.
Wheel parts: The wheel parts are often in contact with the ground and are prone to wear and corrosion. For the painting of the wheel parts, wear-resistant and corrosion-resistant coatings, such as epoxy floor coatings, can be selected. When painting, the wheel surface should be clean and dry, and the coating should be evenly covered to avoid missing coating.
Seats and interior parts: The painting of seats and interior parts should take into account the comfort and safety of the elderly. The paint on the surface of the seat should have good flexibility and should not be easy to crack and peel off; the paint on the interior parts should be non-toxic and odorless materials to ensure the health of the elderly. When painting, attention should be paid to the thickness and smoothness of the coating to avoid discomfort to the elderly.

10. Common problems and solutions in the painting process
Sagging: Sagging is one of the common problems in the painting process, mainly caused by low viscosity of the paint and uneven spraying thickness. The solutions include: adjusting the viscosity of the coating, appropriately increasing the concentration of the coating; controlling the spraying thickness to avoid spraying too thick at one time; extending the drying time of the coating so that the coating will not sag due to its own weight before drying.
Orange peel: Orange peel is a rough phenomenon on the surface of the coating, mainly due to poor leveling of the coating and unskilled spraying skills. The solutions include: choosing a coating with good leveling; adjusting the parameters of the spraying equipment, such as spraying pressure, flow, etc.; during the spraying process, ensure that the distance between the spray gun and the surface of the vehicle body and the spraying speed are uniform.
Blistering: Blistering is caused by the failure of the gas inside the coating to escape in time, or the unclean surface treatment of the vehicle body. The solutions include: ensuring that the surface of the vehicle body is clean and dry, free of impurities such as oil, water, etc.; during the painting process, try to avoid mixing air into the coating; for coatings that have already blistered, acupuncture degassing can be used for treatment, and then repainting.
Particles: Particles are caused by impurities mixed in the coating or dust falling on the surface of the wet paint film during the spraying process. Solution: Filter the paint to remove impurities; keep the painting environment clean and reduce the dust content in the air; before spraying, test spray to check whether the paint contains particles.

Conclusion
Details in the painting process of the elderly three-wheeled scooter are crucial, which is directly related to the quality of the product and the use experience of the elderly. From surface treatment before painting, paint selection, coating process control, environmental adjustment, to quality inspection, equipment maintenance, safety and environmental protection, every step requires us to pay full attention and meticulous operation.
For international wholesale buyers, choosing a supplier with good coating technology and quality control system is the key. At the same time, buyers should also strengthen their learning and understanding of coating knowledge in order to better communicate and cooperate with suppliers to jointly provide high-quality, beautiful and durable three-wheeled scooters for the elderly. Let us work together to care for the quality of life of the elderly and bring more convenience and comfort to their travel.