Application of water-based single-component machine paint on machine tool coating

Water-based paint is a new green paint in recent years, from the original for home decoration latex paint to now spray automotive, aviation water-based industrial coatings, water-based paint is increasingly mature. At the same time, water-based coatings not only reduce VOCs emissions, but also reduce the health damage to the human body to a minimum. Therefore, water-based industrial coatings for the machinery and machine tool industry are gradually replacing solvent-based coatings and becoming a new direction in the coating industry. This paper discusses the application of water-based single-component machine paint in machine tool coating.
variety and characteristics of machineSolvent-based machine tool paintaccording to the different machine tool products, solvent-based paint is also divided into different grades, the lower grade is nitro paint, perchloroethylene paint, this kind of paint because of cheap, convenient construction and popular, but its gloss, freshness is poor, especially in the humid and sultry environment will appear white phenomenon, need to add moisture to prevent, usually this kind of products will be used for low-grade machine tools. Mid-range products for single-component acrylic paint or single-component modified acrylic paint, such paint price is moderate, gloss is better and used in high-grade machine tool products.
water-powered machineWater-based machine tool paint according to the different classification of machine tool products, water-based single-component acrylic paint belongs to the mid-range products, such as Shanghai paint research and development of SZB-02 water-based single-component machine tool paint, such paint construction is convenient, faster dryness, better gloss, water resistance, lubricant resistance, cutting fluid is also better, can replace solvent-based nitro, perchloroethylene and single-component acrylic paint suitable for medium-grade machine tool coating.
the film-forming system of machineWater-based paint in the membrane process, with the evaporation of water through the polymer particle concentration, aggregation and overlap, extrusion deformation process. The evaporating of water is caused by the difference in pressure between the water vapor in the air and the moisture in the water-like paint. Because the air contains water vapor, so the evaporative water in water-like paint and temperature, humidity has a considerable relationship. And solvent-based coating film with the evaporation of organic solvents, polymers are always concentrated in a molecular state, film stage single, solvent volatilization is the use of solvent vapor in the air and solvents in the paint to form pressure differences. Since the air does not contain solvent vapor, the volatile of solvent-based paint has a relatively small relationship with temperature and humidity.
table 1 is a water-based single-component machine tool paint on the appearance of the paint film, gloss, drying time, oil resistance and cutting fluid and other performance indicators.
table, the technical indicators of water-based single-component machine
project namePerchloroethylene machine painttechnical indicators single-component water-based machine painttechnical indicators paint film appearance paint film flat, particle-free paint film flat, particle-freegloss (60 degrees), % ≥80 ≥80drying time (25 degrees C, 30%) -60%)table dry, h ≤2 ≤2dry, h≤24 ≤24resistant lubricants, no less than 24 h (with water-based epoxy primer matching)no foaming, no rust, no peeling, allowing for minor color changesno foaming, no rust , does not peel, allows slight color change cut-resistant liquid, not less than 24 h (with water-based epoxy primer no foaming, no rust, no peeling, allowing minor color change
Machine tool paint construction key factors heat, humidity and air flow water-based paint is volatile by water, so the construction environment requirements are relatively high, it is generally recommended that the coating workshop can do thermostat constant humidity, but most machine tool factory coating environment is relatively bad, even if you can not do the temperature and humidity, but also require the site temperature, humidity data measurement.
Generally in the summer high temperature or humidity hours, moisture volatility is too fast, flattening time is short, bubbles too late to break the paint has been dry, will cause the surface rough, then it is necessary to appropriately increase the amount of water added, appropriately extend the leveling time. If the humidity is high, in addition to less water, but also to maintain the circulation of air. The baking unit can be added if conditions are met.
film isWater-like paint should be thin coating, multi-channel construction. A construction is too thick, especially when the plane spray, a spray too thick, poor film quality, common paint disease is whitening long-term not retreat, local cracking, cross or human characters, may also produce orange peel. These phenomena are related to the accumulation and migration of water in the lacquer film, the gradient and gradient size of the surface and the internal water, and also to the degree of contraction when the emulsion is formed into the film.
drying time Water-resistant single-component machine tool paint table dry faster, but really to do the work requires a certain amount of time, which is also due to the water evaporation potential heat is higher related, usually high temperature season or humidity is small environment generally need to do 3-5 days, and in winter it takes longer. Therefore, it is generally recommended that the construction of water-based machine tool paint manufacturers are best to establish baking equipment, if unconditional can also be added simple baking equipment, ventilation equipment.
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