• Silibase Product

    Silibase is one of the leading & professional manufacturers specialized in producing all kinds of SILICONE BASED new materials.

  • Silibase Technique

    Silibase technique team always focus on quality first and insist on developing new products.

  • Silibase Service

    Silibase people will serve you the best before and after sale.

Characteristics of Organic Silicon Coatings

Jul 19, 2024

Silicone resin has excellent properties such as heat resistance, cold resistance, moisture resistance, hydrophobicity, and weather resistance. It can be used as a special coating (i.e. silicone coating) and plays a significant role in the special coating industry. There are many types of organic silicon coatings, mainly including high-temperature resistant coatings, weather resistant coatings, wear-resistant hardening coatings, anti adhesive release coatings, moisture-proof and hydrophobic coatings, radiation resistant coatings, etc.

There are many types of heat-resistant coatings, but organic silicon heat-resistant coatings and inorganic heat-resistant coatings are the most commonly used. Among them, pure silicone varnish can withstand 200-250 ° C. It is a high-temperature resistant coating formulated with silicone resin as the base material, heat-resistant pigments (including coloring pigments and additive pigments, metal powder, heat-resistant fillers, glass powder, black iron oxide powder, and oxide labels), solvents, curing agents, and additives. It can withstand 300-700 ° C and can be used for a long time at 250-400 ° C while maintaining its color and luster. Organic silicon heat-resistant coatings have good heat resistance (generally applicable within a temperature range of 250-400 ° C), water resistance, electrical insulation, and good mechanical properties, but they have low hardness, poor flame resistance, and are relatively expensive. Cross linked silicone resin begins to decompose at around 300 ° C, with faster decomposition occurring at higher temperatures (depending on the phenyl/methyl ratio). The final product of decomposition is silica, which, although brittle, can still serve as a binder (film-forming material) for high-temperature resistant pigments. Inorganic heat-resistant coatings can withstand temperatures up to 400~1000 ° C, or even higher. Inorganic heat-resistant coatings have good flame resistance and high hardness, but the paint film is brittle and has poor water resistance before fully curing. They also have strict requirements for substrate treatment.

There is no consensus on the definition of heat resistance of coatings, and opinions vary. Generally refers to coatings that maintain appropriate physical and mechanical properties and protective effects at temperatures above 200 ° C, with minimal color and gloss changes in the coating, intact coating, and no cracking. These coatings are called heat-resistant coatings. Heat resistant coatings are widely used in high-temperature environments, such as steel pipes, high-temperature steam pipelines, heat exchangers, high-temperature furnaces, petroleum cracking equipment, high-temperature reaction equipment, engine parts and exhaust pipes, and military equipment for exterior decoration, to prevent the thermal oxidation and corrosion of steel and other metals at high temperatures and ensure long-term use of equipment. With the development of aviation and aerospace industries, the rapid growth of the national economy, and the increasing awareness of anti-corrosion among people, the demand for this type of coating is becoming stronger and the amount used is also increasing. At present, there are many types of heat-resistant coatings, which can generally be divided into two categories: organic heat-resistant coatings and inorganic heat-resistant coatings.

By leveraging strengths and avoiding weaknesses, and complementing each other's performance, organic resin and inorganic coatings are often used to match or chemically modify inorganic organic heat-resistant coatings. Silicone resin used as a base material for heat-resistant coatings, in addition to pure silicone resin, modified silicone resin with organic resins such as phenolic, epoxy, alkyd, polyurethane, and acrylic resins has also been widely used. The organic silicon content in the components of organic resin modified with organic silicon reaches over 50%, and the heat resistance is significantly improved. Therefore, both can be widely used in heat-resistant coatings and occupy an important position in heat-resistant coatings. Generally speaking, the latter is not as heat-resistant as silicone resin, but it is superior to pure silicone resin in terms of solvent resistance, chemical resistance, and adhesion. Moreover, under specific conditions, using silicone resin containing organic resin as the base material can achieve better performance. Attention should be paid to the (number of methyl groups/number of phenyl groups) methyl/phenyl ratio contained in the organosilicon oligomers used for modified resins. Due to the better heat resistance and poorer physical and mechanical properties of phenyl groups compared to methyl groups, in modified resins with the same organic silicon content, if the methyl/phenyl ratio of organic silicon oligomers increases, the thermoplastic, photopolymerization, color retention, and heat-resistant lubricating oil properties of the coating will decrease, but the physical and mechanical properties of the coating, as well as the heat resistance to micro cracking time, will be improved. Therefore, the modified resin and the formula composed of organosilicon oligomers should be designed according to the special requirements of the application.

Our main products are Silicone Resin for Mica Insulation Materials,Silicone Resin for Motor,Silicone Resin for H-class motors,Silicone Resin Modifier for Artificial Leather,Amino Phenyl Silicone Resin,Dimethicone Silicone Resin Blend,Silicones in Hair Care,Silicone Resin Blend for Personal Care.

Copyright © 2011-2024 SILIBASE! All Rights Reserved.