Organosilicate resins are a class of semi-inorganic and semi-organic polymer materials with silicon-oxygen bonds (-Si-O-Si-) as the main chain and organic groups (such as methyl, phenyl, vinyl, etc.) connected to the silicon atoms.
Its chemical properties are unique, and it has the characteristics of both inorganic and organic materials. The specific manifestations are as follows：
1. Excellent thermal stability
High temperature resistance: Silicone resin is not easy to decompose at high temperatures, and the long-term use temperature can reach 200-300℃, and it can withstand higher temperatures in the short term.
Thermal oxidation stability: In a high-temperature oxidation environment, the silicon-oxygen bond structure is stable, not easy to be oxidized, and exhibits excellent thermal oxidation stability.
2. Good chemical inertness
Chemical resistance: It has good resistance to most acids, alkalis, salts and organic solvents, and is not easy to undergo chemical reactions.
Water resistance: The hydrophobicity of the silicon-oxygen bond makes it have excellent water resistance and is suitable for humid environments.
3. Unique cross-linking curing properties
Condensation crosslinking: Silicone resins usually form a three-dimensional mesh structure through the condensation reaction of silicon hydroxyl groups (-Si-OH), and have excellent mechanical properties and chemical resistance after curing.
Additive coupling: Vinyl-containing organosilicate resins can be quickly cured by silicon-hydrogen addition reaction (such as reaction with hydrogen-containing silicone oil).
4. Excellent electrical insulation properties
High insulation strength: The polarity of the silicon-oxygen bond is low, and the intermolecular force is weak, which gives the silicone resin excellent electrical insulation properties.
Stability over a wide temperature range: Within a wide temperature range, its dielectric constant and dielectric loss vary little, and it is suitable for high-temperature electronic packaging materials.
5. Good weather resistance and UV resistance
Weather resistance: The stability of the silicon-oxygen bond makes it not easy to age in outdoor environments, and it is not easy to powder or crack after long-term use.
UV resistance: It has good resistance to ULTRAVIOLET radiation and is suitable for outdoor coatings and sealing materials.
6. Low surface energy and hydrophobicity
Low surface energy: The low polarity of the silicon-oxygen bond makes the silicone resin have a low surface energy and exhibit excellent hydrophobicity and antifouling properties.
Anti-stick: It can be used to make anti-stick coatings, such as mold release agents, non-stick pan coatings, etc.
7. Physiological inertness
Biocompatible: Silicone resins are non-toxic and non-irritating to organisms, and are widely used in the field of medical devices and biomaterials.
8. Adjustable chemical structure
Functional modification: By introducing different organic groups (such as amino, epoxy, fluoro, etc.), silicone resins can be given new functions, such as adhesion, flame retardant, and oil resistance.
9. The relationship between molecular structure and performance
R/Si ratio: The ratio of organic groups (R) to silicon atoms (Si) (R/Si ratio) affects the crosslinking density and properties of the resin.A lower R/Si ratio (such as 1.0-1.2) is conducive to the formation of a highly crosslinked network structure, improving heat resistance and mechanical strength; a higher R/Si ratio (such as 1.5-2.0) gives the resin better flexibility and solubility.
Organic group types: Methyl (CH=) group improves flexibility and cold resistance, phenyl (CHH₅) group enhances heat resistance and hardness, and vinyl (CH=CH₂) group promotes crosslinking reaction.
10. Sol-gel reaction characteristics
Hydrolysis and condensation: The precursor of organic silicone resin (such as siloxane) can form a sol through hydrolysis and condensation reaction, further condense to form a gel, and finally solidify into a three-dimensional network structure.This characteristic makes it widely used in the fields of coatings, adhesives and composite materials.
Application area
The unique chemical properties of silicone resins make them widely used in the following fields：
Electrical and electronic: insulation materials, packaging materials, conductive adhesives, etc.
Aerospace: high temperature resistant coatings, sealing materials, heat-proof coatings, etc.
Construction: waterproof coatings, sealants, weather-resistant coatings, etc.
Automobiles: high temperature resistant greases, seals, anti-stick coatings, etc.
Medical treatment: artificial organs, medical catheters, drug sustained-release materials, etc.
summary
The chemical properties of silicone resin are derived from its unique combination of silicon-oxygen bond backbone and organic groups, which makes it both the high temperature stability of inorganic materials and the flexibility and functionality of organic materials.Through the molecular structure design, its performance can be further optimized to meet the application needs of different fields.
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IOTA 995 Silicone Sealant For Total Vision System - IOTA CORPORATION LTD.
