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News > Dynamic industry > High temperature protective coatings.

High temperature protective coatings.

Present situation of research and application development of high temperature protective coatings

High temperature corrosion of metal is one of the key issues facing the metal materials,plays an important role in the development of modern science and technology andEngineering in china. As in the beginning of the steam turbine development, workingtemperature is only 300 degrees Celsius, now has up to 630 to 650 DEG C; modernsupersonic aircraft engine operating temperature has reached 1150 degrees. These high temperature working environment, will inevitably bring about the high temperaturecorrosion of materials. The development of modern petroleum chemical industry,metallurgy, aerospace, nuclear engineering and technology also cannot do without high temperature corrosion resistant material, high temperature corrosion has become an important part in the field of metal corrosion. In recent years, researchers at home and abroad are committed to the development of high temperature protective coatings, high temperature resistant, multi use, excellent performance and low pollution.

1 organic high temperature protective coatings

Development characteristics of organic polymer coating is resistant to high temperatureand on the basis of the original to continuously improve performance, reduce cost, low pollution, promote the function of new products to promote the development of a new,anticorrosion industry. Study on improving the high temperature resistant properties of the coating are mainly concentrated in the exploration of the matrix resin, such asheterocyclic polymers, polymer and orderly ladder polymer. The high temperature resistant coating mainly consists of organic silicone, heterocyclic polymer, polymercontaining titanium and other types of.

The 1.1 organosilicon resin

High temperature resistant silicone coating consists of pure silicone resin and siliconeresin modified by the base material, and mixed with inorganic high-temperature filler,solvent and additive, has excellent heat resistance, radiation resistance, water resistance, chemical corrosion resistance and electrical insulation properties. The varnishcan be 200 to 250 degrees, high temperature protective coating with metal powdermaterials such as functional filler, glass can be made resistant to 300 to 700 DEG C. In recent years, the domestic research on organic silicon coating mainly focused on themodification of silicone resin, and high temperature resistant filler on high temperature properties of coating effects, and has made considerable progress, has formed a high temperature resistant coating, high temperature resistant insulating coating and heat resistance and flame retardant coating of various functional coatings. But in water resistance, light cured and higher temperature resistance grade silicone high temperature coating and other aspects of the study compared with foreign countriesthere is a big gap, so the function of organosilicon high temperature protective coatingsand waterborne has gradually become a research hotspot. Application of waterborne coatings on no occasion limitation, does not need special equipment and painting tools,has the advantages of low toxicity, low VOC coatings become mainstream development direction. Therefore, we should promote the development of water-based, solvent free,low viscosity, high solid content of silicone heat resistant coating, and to the development of high performance, multi-functional and composite. Such as the introduction of neworganic substituents, through modification to enhance the structure performance; through the study of new synthetic technology, exploration, development of special functionalmaterials.

Silicone heat protective coating including the direction of the research: (1) the introduction of nanotechnology and high temperature polymer, composite and micromacro composite technology, can improve the strength and toughness of the coating,improve the high temperature performance of the silicone backbone; (2) in theintroduction of various heterocyclic ring structure or other heat and heteroatom groups,such as carborane cage structure, heterocyclic heat group; also can be in the siliconebackbone into two Mao Luo iron complex structure, greatly improve the heat resistance and mechanical properties of silicone resin; (3) the development ladder polymer main chain on the silicon, the polymer temperature grade can reach 1300 DEG C, and coating in 1200 C has a certain strength; (4) research on synthetic technology of silsesquioxanesand polymer. Cage hexahedral silsesquioxane is a kind of novel heterocyclic organic / inorganic heterocyclic materials materials with special performance, not only has thecharacteristics of inorganic and organic materials, and because of the uniqueness ofadjustability, also has a single inorganic and organic matter can not be compared; (5)effect of hyperbranched heat-resistant polymer the hyperbranched polymer, can bedirectly through the polymerization of monomer, simple, and very high degree of functionalization on the surface molecular structure is large, solubility in organic solvents.Compared with the linear molecules, the viscosity is low, the glass transition temperature is higher; compared with dendrimers are more likely to achieve large-scale industrial production, has a good potential application.

The 1.2 heterocyclic polymers

Polyimide as a member in the family of heterocyclic polymers, not only has excellentelectrical properties, radiation resistance and chemical resistance, but also has moreexcellent high temperature performance, and its decomposition temperature is 600 degrees centigrade, is one of the best varieties of thermal stability of the organic polymer. At the same time also has the properties of low temperature tolerancecoefficient, excellent mechanical properties and good and similar thermal expansion of metal. Therefore, high temperature protection in the field of aviation has been applied.

1.3 titanium containing polymer

Titanium polycarbonsilane in 200 ~ 700 DEG C, the mass loss rate is about 10%, soluble in organic solvents. Addition of appropriate fillers can be made of high temperature resistant coating, coating density, high hardness after curing, heat resistance up to 800 degrees.