Anticorrosive paint Aug 12, 2021
Anticorrosive paint is a type of paint used on the surface of an object to protect the inside of the object from corrosion. It is a kind of paint commonly used in industrial construction. It is widely used in aviation, shipbuilding, chemical industry, oil pipeline, steel structure, bridge, oil drilling platform and other fields, and is favored by the majority of construction manufacturers.

Types, ingredients and characteristics:
There are many types of anti-corrosion paints. According to the composition, they can be generally divided into: epoxy anti-corrosion paint, polyurethane anti-corrosion paint, acrylic anti-corrosion paint, inorganic anti-corrosion paint, perchloroethylene anti-corrosion paint, chlorinated rubber anti-corrosion paint, high chlorinated polyethylene anti-corrosion paint; Uses can be divided into: anti-corrosion paint for pipelines, anti-corrosion paint for ships, anti-corrosion paint for metals, anti-corrosion paint for furniture, anti-corrosion paint for automobiles, anti-corrosion paint for rubber; according to the solvent can be divided into: water-based anti-corrosion paint, oil-based anti-corrosion paint;
Anti-corrosion paint is a mixture of a variety of water-containing silicate minerals, the main chemical group is Al2O3 and SiO2 two oxides. Al2O3 is mainly derived from clay minerals. In addition to clay minerals, SiO2 also comes from fine-grained quartz. The closer the Al2O3 content and Al2O3/SiO2 ratio to the theoretical value of kaolinite minerals, the higher the purity of this type of clay.

It can be used under harsh conditions, and has good durability and weather resistance. It can be used for 10 or 15 years under harsh conditions such as oceans and underground, even in acid, alkali, salt and solvent media, and It can be used for more than 5 years under certain temperature conditions.

The more kaolinite in the clay, the better its quality. The higher the refractoriness of the clay, the wider the sintering melting range of the clay. The main impurities in clay are oxides of alkali metals, alkaline earth metals, iron and titanium, and some organic matter. Various oxides have a fluxing effect and will reduce the refractoriness of raw materials. Therefore, the lower the content of impurities in the clay, especially the content of Na2O and K2O, the higher the refractoriness. There are many types of clay minerals, but they usually only consist of 5-6 kinds of minerals. The main mineral is kaolinite. Common impurity minerals include quartz, hydromica, iron-containing minerals, feldspar, rutile and so on. Impurity content and uniformity of distribution affect the fire resistance of clay. The anticorrosive paint will undergo a series of physical and chemical changes during the heating process, such as decomposition, transformation, recrystallization, etc., accompanied by volume shrinkage. These changes have an important impact on the process and properties of clay products. The clay raw materials in my country, whether it is hard clay, soft clay or semi-soft clay, are mainly kaolinite type. Therefore, the heating change of clay is essentially the heating change of kaolinite and the physical and chemical reaction between kaolinite and impurity minerals. Hard clay clinker is the main raw material of clay refractory materials. It is usually obtained by calcination in an inverted flame kiln, a rotary kiln, or a shaft kiln with the hard clay raw material blocks that are directly mined.

In addition to the chemical composition, the production of refractory materials requires clay clinker to have high bulk density, low porosity, low water absorption, and full sintering. Therefore, the calcination temperature and holding time have a significant impact on the quality of clay clinker. When the calcination temperature is 1200~1250 degrees Celsius, the clinker volume density and porosity index are the best. When the temperature is greater than 1350 degrees Celsius, the bulk density decreases and the porosity increases, because cristobalite is produced in large quantities at this time, and the volume expands. At the same time, the clinker block is cracked due to the development of the charred gem layer. The main mineral phase of the anticorrosive paint hard clay is mullite. It accounts for 35%~55%, by glass phase and cristobalite.

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