Properties of glass flake
Thread Content
Our company plans to implement an ammonia-based desulfurization project. The design team has suggested that the main body of the desulfurization tower be made of carbon steel with a glass flake lining. I would like to ask which type of resin is most suitable for this purpose Corrosion resistance, wear resistance, adhesion to the substrate, coefficient of linear expansion, etc
Depending on the specific operating conditions, polymer materials can be used for internal anti-corrosion purposes; they bond well to the substrate and are resistant to wear and corrosion. It is simple to construct and easy to maintain.
The VEGF glass flake putty series can be chosen; it offers excellent resistance to chemical media and corrosive gases in high-temperature, humid conditions, a very low water vapor permeability, low shrinkage upon curing, a low coefficient of linear expansion, resistance to high temperatures and severe temperature fluctuations, low wear resistance, the ability to cure at room temperature, simple molding and application procedures, and ease of repair. Based on the temperature of the medium, they can be divided into high-temperature and medium-temperature series.
The glass flake mortar for vinyl ester resins can meet the requirements
Reply to 4# wq4112: How can its coefficient of expansion be the same as that of the carbon steel matrix?
Different materials will have different levels of expandability.
Reply to 6# yuchenchf: How can we make their expansion rates similar? How can cracking or bubbling be prevented in areas with large temperature differences?
The general approach is to use glass flake coatings based on vinyl ester resins as well as FRP; these materials are widely used in this application. Looking at the current state of the industry, the domestic market is rather chaotic with uneven quality standards. Not many large-scale ammonia-based desulfurization systems in China are able to produce sulfur efficiently and operate continuously – things are not as good as advertised. There is still a gap compared to the mature calcium-based desulfurization methods. When considering materials for corrosion protection, it is necessary to take into account the uncertainties associated with operating conditions (so the requirements should be set higher). Relying simply on the materials used in calcium-based desulfurization methods can pose significant risks. When selecting materials, foreign brands should be given priority, followed by joint-venture brands with a good reputation; domestic materials are not recommended (those who use them know best; I’m not being pro-foreign, but I’m basing my recommendations on practical considerations).
From what we understand, glass phosphide sheets are widely used in Japan, but their use in China is not very satisfactory. The same is true even when using Japanese raw materials. The fundamental reason lies in the mastery of construction techniques and the construction process. The construction techniques described in books are more or less the same, but in practice there is a significant difference. As for the construction process, it goes without saying that the costs are low, labor protection is inadequate, and there is no strict control over key stages during construction, among other issues. In general, it’s just characterized by Chinese characteristics. If the owner is a state-owned enterprise, it cannot be changed under the current system. If it’s a private company, be sure to keep a close eye on things – the quality can vary greatly.
Among the domestic manufacturers that produce high-quality glass flake mortar, Shanghai Huachang and Fuchen are notable for their professional approach to production