Anticorrosive paint is used in the surface of the object can be used to protect the interior of the object from corrosion of a class of paint. It is a kind of paint which is more common than anti-corrosion paint in industrial construction. It is widely used in the fields of aviation, shipbuilding, chemical industry, oil pipeline, steel structure, bridge and oil drilling platform and is favored by many construction companies.
A wide range of anti-corrosion paint, in accordance with the composition of the general can be divided into: epoxy anti-corrosion paint, polyurethane anti-corrosion paint, acrylic anti-corrosion paint, inorganic anti-corrosion paint, vinyl chloride anti-corrosion paint, chlorinated rubber anti-corrosion paint, Use can be divided into: pipeline anticorrosive paint, ship anticorrosive paint, metal anticorrosive paint, anticorrosive paint for furniture, anticorrosive paint for automobile and rubber anticorrosive paint. According to the solvent, it can be divided into: water-based anticorrosion paint,
Anticorrosion paint is a mixture of a variety of hydrous silicate minerals, the main chemical group is two oxides of Al2O3 and SiO2. Al2O3 is mainly derived from clay minerals, SiO2 from clay minerals, but also from fine quartz. The closer its Al2O3 content and Al2O3 / SiO2 ratio to the theoretical value of kaolinite minerals, the higher the purity of such clays.
It can be used under harsh conditions and has good durability and weatherability. It can be used in harsh conditions such as the ocean and underground for 10 years or more even in acid, alkali, salt and solvent mediums, Under certain temperature conditions, can also be used for more than 5 years.
The more kaolinite in the clay, the better its quality. The higher the refractoriness of clay, the wider the melting range of the sintered clay. The main impurities in the clay are alkali metals, alkaline earth metals and oxides of iron, titanium and the like, as well as some organic matter. Various oxides play a role of fluxing, will reduce the refractoriness of raw materials, therefore, clay impurities, especially Na2O and K2O content, the higher the refractoriness. Clay minerals are many, but usually only from 5 to 6 kinds of minerals, the main mineral is kaolinite. Common impurity minerals are quartz, hydromica, iron minerals, feldspar, rutile and so on. Impurity content, the degree of distribution of uniform clay fire resistance. Anticorrosive lacquer in the heating process will occur a number of columns of physical and chemical changes, such as decomposition, calcification, recrystallization, etc., accompanied by volume shrinkage. These changes have an important impact on the process and properties of clay products. China's clay raw materials, whether it is hard clay, soft clay or semi-soft clay, mainly kaolinite type. Therefore, the change of clay heating is essentially the change of heating of kaolinite and the physicochemical reaction between kaolinite and impurity minerals. Hard clay clinker is the main raw material of clay refractory materials, usually by direct mining in addition to the hard clay raw material block inverted flame kiln, or rotary kiln, or kiln calcined derived.
In addition to the chemical composition, refractory production requires high bulk density of clay clinker, low porosity, low water absorption and adequate sintering. Therefore, calcination temperature and holding time have a significant impact on the quality of clay clinker. Calcination temperature 1200 ~ 1250 degrees Celsius, clinker bulk density and porosity of the best indicators. At 1350 degrees Celsius, the bulk density decreases and the porosity increases. At this time, cristobalite is produced in a large amount and expands in volume. At the same time, the developed coke gem layer leads to cracking of the clinker block. The main mineral phase of anticorrosion paint hard clay is mullite, Accounting for 35% to 55%, followed by the glass phase and cristobalite.