With the rapid development of steel structure construction industry, its poor fire and corrosion resistance performance is still the fatal weakness of steel structure. Therefore, when we install and manufacture steel structure buildings, we must give steel structure buildings anti-corrosion work, in order to extend the life and safety of steel structure buildings.
It is necessary to add protective film to steel structure.
Spray painting is a necessary work to add protective film to steel structure. It can not only protect steel structure members from rust and corrosion, but also play an important role in fire prevention. The commonly used paints can be divided into two categories: oil-based paint and water-based paint. Which one is more suitable for steel structure? Today, we will discuss it with Guangzhou steel structure group
First of all, let's have a rough understanding of the basic concepts of these two kinds of paints
Oily paint: oily paint is also called grease paint. Dry oil as the main film-forming materials of a class of coatings, mainly clear oil, thick paint, oil-based ready mixed paint, oil-based antirust paint, putty, putty, etc. The main oils used are tung oil, flax oil, catalpa oil, soybean oil, sunflower seed oil, fish oil, etc,
Water based paint: it is made of water as dispersing medium, using physical, chemical and other multiple anti rust mechanisms, according to chemical principles such as chemical conversion, complexing and reflection. It is the best replacement product of traditional antirust primer. It is widely used in all kinds of automobiles, ships, grids, machinery manufacturing, containers, railways, bridges, boilers, steel structures, petrochemical equipment and other anti-corrosion protection.
Difference between oil-based paint and water-based paint:
1. Environmental protection. From the perspective of environmental protection, water-based paint has natural advantages over oil-based paint (solvent wood paint). In theory, the lower the VOC content, the higher the environmental protection. However, the low content of VOC has an impact on the wear resistance, hardness and scratch resistance of the oil-based paint, and the above indicators have always been the technical problems to be solved in water-based paint. How to achieve both environmental protection and high quality is the focus of technical research of major coating manufacturers.
2. Cost performance. Water based paint in drying time, hardness, plumpness and other performance of the technical requirements are relatively high, the manufacturing process is relatively complex, and requires large production equipment to produce more stable performance products, production costs are relatively high. This is also the same level of water-based paint price is much higher than the oil-based paint reason. It is understood that among the middle end products on the market, the oil-based paint is about 200 yuan / group, including curing agent, thinner and paint, with a total weight of about 5 kg; the water-based paint is about 400 yuan / barrel, with a barrel of 18 liters.
In general, water-based paint in addition to a slightly higher price, whether from the construction or environmental protection is a good choice. Of course, the choice can not be generalized. When making steel structure, we should pay more attention to the local geographical environment and climate, and then make the best choice. Fire prevention and protection are the most important process of steel structure building. In addition to external objective factors, the selection of steel structure paint should also be regulated according to the design requirements of steel structure.
