Surface coating technology for glass and steel products.

Because of its weather resistance, poor wear resistance, low hardness limits its application, and the market needs a good appearance, cost-effective glass and steel products. There are two ways to solve the defects of glass and steel products: internal alterability and surface coating.
internal changes:
use of high-performance resin substrings, fiber-reinforcing additives, improve the quality of fiberglass

. This method is expensive.
Surface coating:
In the molding process or after the molding of glass and steel products, the surface is modified, protected or given new functions using a variety of different materials with high performance or specific functions to improve the quality and competitiveness of the products. Surface high-quality, multi-functional, do not need to change the formulation of glass and steel products, process conditions.
most fiberglass surface coating protection using simple methods such as painting or spray coating, but the quality is poor, and needs to be maintained frequently. The high-performance glass and steel surface protection refers to the coating technology with high decoration, heavy corrosion, ultra-weather resistance, functionalization and easy construction. High-performance glass and steel surface protection has the following requirements:
coatings (environmental protection):
water-based coatings, powder coatings
, high solids and solvent-free coatings
;
At present, there is a development prospect of the glass and steel surface coating process is:
1, immersion and spraying process
leaching plastic suitable for small, well-shaped work parts, and spraying is suitable for large surface area, shape-regulated work parts. This method is used to coat the glass and steel products, the coating surface quality is good and the investment is not high. The key point of this technology is: the heating temperature and the number of additives in coating configuration control, the quality of coating and paint viscosity, plasticization temperature is closely related. The quantitative index of immersion and spraying process is suitable for film thickness of 0.1 to 0.15mm. The technology to use inororal water-based paint is the best, the use of the paint high price, a larger one-time investment, but the protective effect and decorative effect is very good, after coating volatiles for water, no environmental pollution, coating can be self-cleaning.
2, spraying process
electrostectrectrulation spraying plastic coating efficiency, uniform coating, small pollution, suitable for large-scale automatic coating production lines. Due to the development of various high-performance, medium-low temperature curing powder coatings, the application of this process in glass and steel is promising. The technical difficulty lies in the problem of fiberglass conducting static electricity.
hot-melt spraying process is a combination of "plastic coating process" and "glass and steel products performance" two developed, it is similar to electrostitive spraying process, but omitted static spray plastic in the glass and steel products conductive requirements, and powder plasticization temperature is low. Because of the above advantages, the process is suitable for glass and steel products with larger substrates. The technical key lies in the pre-treatment process and substation temperature of the glass and steel surface. Powder immersion process is mainly used in high temperature thick-walled glass and steel products, especially with special functional requirements of the surface coating of products to increase the function of products.
3, in-mold coating technology
this technology omits the secondary coating process and the required equipment, avoids the contamination of volatile solvents, solves the conventional molding products and secondary coating prone to pinholes, bubbles and other defects. Is the current international level of high surface coating technology, mainly used in SMC molding products.
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