Mixing and Spraying Applications of Two-Component Coatings

With the rapid development of China's industrialization process, as the industrial make-up artist of the painting industry, the application of two- and multi-component coatings is becoming more and more widespread. Two-component coatings because of its environmental protection, weather resistance and excellent comprehensive physical and chemical properties more and more fully affirmed by owners from all walks of life; automotive and parts industry: is applied to the entire vehicle overlay paint, bumpers, reflectors, instrument panels, gas caps, engine guards, etc. in the coating; also used in the electronics industry: terminal shell, all kinds of keyboards, etc.; and so much more industry: aerospace, wood products and furniture, Trucks and buses, engineering, agricultural machinery, general metal products and so on.

Now for the interior parts of the two-component paint characteristics and application features are described below.

The main types of paints are: 1) common two-component medium paint or primer; 2) common two-component top coat.

Painting industry use double, multi-component materials, the main advantages are as follows:

(1) Meet the requirements of environmental protection: facilitate the control of volatiles and harmful waste emissions; avoid direct contact between workers and toxic materials.

(2) Extended product life and good durability: coating film gloss, fullness, fresh reflection, mechanical durability, chemical durability has excellent performance; two-component polyurethane coating film is damaged by external forces, is not easy to damage, with better comprehensive mechanical properties, better toughness; coating film exposed to harsh environments, chemical corrosives, aging life is greatly extended;

(3) more economical production process: reduce the cost of paint, labor and energy to enhance product profits; spraying can be used after low-temperature, short-time baking, drying oven energy is greatly saved; lower VOC, reduce the economic pressure on environmental protection.

(4) Wider application of coatings: higher solids coatings, water-based coatings.

5）Decorative effect: two-component paint maintains the decorative effect of easy leveling of paint and small orange peel phenomenon, and in some occasions its decorative properties are better than powder coating.

Spraying Time

Spraying time is very important for two-component paint users: because the curing of two-component paint is not through the evaporation of solvents and film, but through the chemical cross-linking reaction to complete the curing, curing process will release heat. The spraying time is the starting time when the viscosity of the mixed paint rises at a power-squared rate, at which point the paint rapidly becomes solid from the liquid state until it is completely cured.

Influence of Proportioning Accuracy

Talking about the proportion of accuracy will involve: mass ratio and volume ratio. Dongguan Hetair intelligent two-component metering equipment through the metering cylinder or flowmeter using volume measurement to ensure the proportion of accuracy; and manual mixing usually use the mass ratio measurement. Proportion accuracy is to achieve the best performance of the material itself is a prerequisite: too much curing agent will usually make the curing time becomes shorter, after the paint film toughness decreased brittle, and even cracking, yellowish color and other phenomena; curing agent is too little, will make the paint difficult to cure, or even can not be cured. Proportion accuracy is not guaranteed is a two-component interior paint use taboo, seriously affect the quality of spray paint, resulting in rework or product scrap.

In the use of two-component equipment to affect the proportion of the following factors: 1) A, B material pressure matching: 2) viscosity matching: 3) whether the cleaning program is reasonable; 4) proportional valves and other mechanical components of the performance degradation.

Plastic Parts Spraying Color Change and Cleaning

Plastic parts spraying is characterized by many types, relatively small batch, color change and cleaning more frequently; electronic proportioning of two-component paint mixing equipment with automatic cleaning function, to ensure maximum safety of the equipment. When the electronic proportioning equipment detects that the mixed material in the mixing chamber is close to the actual spraying curing time (the time can be set manually), the equipment will automatically clean the mixing chamber.

Multi-color Compatibility

In order to cope with the diversification of the color of the whole car, the parts strive to correspond to the color and reduce the color difference, the use of two-component interior paint puts forward higher requirements on the color compatibility of the spraying equipment.

The two-component electronic proportioning equipment has up to 99 preset formulas for use. Switching between formulas can be accomplished with one-touch operation. The equipment will automatically execute the color change and cleaning procedures, color change and cleaning procedures need to be written in the control cabinet.

Dongguan Hetair intelligent two-component electronic proportioning system, which is the most widely used in the global and domestic interior painting industry at present, has the following functions:

(1) Wide range of applicable materials: two-component solvent-based and water-based epoxy, polyurethane and acid-cured varnish.

2）One-time investment: later use, only a small number of piston seals such as proportioning valves, secondary cost investment will occur.

3）Real-time monitoring and control of flow and proportioning conditions, paint consumption statistics, provide management and historical data query.

6）Single color and multi-color function selection can meet a variety of application process.

7）Can quickly change color, reduce the amount of paint and save time.

(8) Wide range of coating viscosity, can match the viscosity of 20~1900cps.

In summary, the use of two-component paint must be selected to match the two-component proportioning system equipment. In order to improve product quality and production efficiency at the same time, reduce material waste, and can take into account the management of materials (usually two-component paint and paint solvent prices will be higher than ordinary single-component paint). On the basis of understanding the dosage and unit price of paints and solvents, the investment in process equipment can be confirmed through a reasonable return on investment analysis, on-site management for the enterprise to improve quality, increase efficiency and reduce costs provides an alternative method.