A High Heat Resistant Silicon-Boron-Carbon-Nitrogen (SiBCN) Composite Adhesive
About SiBCN Composite Adhesive
In today’s rapidly advancing world, the demand for high heat resistant materials is growing in key industries such as mechanical engineering, chemical processing, and electronics. One material that has stood out in research and development is the SiBCN composite, a unique quaternary ceramic known for its extraordinary performance. This material has captured the attention of scholars worldwide due to its impressive capabilities.
The main appeal of SiBCN ceramics lies in their excellent high-temperature stability and unique ability to maintain an amorphous structure. Specifically, SiBCN materials can retain their structure even at extreme temperatures of up to 1500°C, demonstrating remarkable thermal stability. Even more impressively, SiBCN fibers show almost no weight loss when exposed to temperatures close to or exceeding 2000°C, making them highly reliable for use in extreme environments.
The development of SiBCN composite adhesives is not only a major advancement in polymer science but also a significant contribution to the field of high-heat resistant material. Its potential applications and societal value are vast.
Raw Materials of SiBCN Composite Adhesive
What makes this SiBCN composite adhesive unique is its carefully designed raw material composition.
Key raw materials include:
- Methylvinylphenylsilazane-Melamine Cyanurate: This core component makes up 30-50% of the adhesive by weight. It is produced through a condensation reaction involving melamine cyanurate, silicon tetrachloride, methylvinyl dichlorosilane, and phenyltrichlorosilane in a specific molar ratio of 1:1-2:1-2:1-1.5. As a result of this precise formulation, the adhesive gains excellent thermal and chemical stability.
- Hexagonal Boron Nitride (hBN): Serving as a reinforcing agent, it constitutes 5-15% by weight, enhancing the hardness and wear resistance of the adhesive.
- Tackifier (S1001): Comprising 40-50% of the system, it ensures strong adhesion between the adhesive and substrate.
- Epoxy-based T-shaped Multifunctional Silane (SHY301000): Making up 5-15% by weight, this increases the crosslink density and weather resistance of the adhesive.
To further enhance the adhesive’s performance, a dispersing stabilizer, such as acetylacetone, is added. By using a weight ratio of 1-3:30-50 with the silazane, this addition helps prevent agglomeration during preparation. As a result, it ensures better uniformity and stability in the final product.
Heat Resistant Material Preparation Method
- Mixing the raw materials: First, accurately measure and mix the raw materials according to the required ratios, ensuring thorough contact between components.
- High-temperature and high-pressure reaction: Then, place the mixture in a modified attrition mill and react at 200-300°C under pressures of 2 MPa or higher. During this process, the raw materials undergo complex chemical reactions, forming the SiBCN composite adhesive with excellent properties. After the reaction, the adhesive becomes a liquid with particle sizes ranging from 100 to 500 nm. Consequently, this ensures good penetration and strong adhesion.
Production of Methylvinylphenylsilazane-Melamine Cyanurate
One of the key raw materials, methylvinylphenylsilazane-melamine cyanurate, is produced as follows:
- Condensation reaction: Combine melamine cyanurate, silicon tetrachloride, methylvinyl dichlorosilane, and phenyltrichlorosilane in a molar ratio of 1:1-2:1-2:1-1.5 in a fluidized bed, carrying out a condensation reaction at 30-180°C. Monitor the release of hydrogen chloride gas throughout the process. Once the gas release stops, the condensation reaction is complete, yielding a polymer that undergoes further post-processing.
- Post-processing: Wash the polymer with water to remove impurities and unreacted substances. Then, at 100-120°C, remove low-boiling components. After cooling, filter the product and further wash and dry the filter cake to obtain white granular methylvinylphenylsilazane-melamine cyanurate.
Application of Heat Resistant Material – SiBCN Composite Adhesive
Before using the SiBCN composite adhesive, it must be diluted. The steps are as follows:
- Add a suitable solvent (such as alcohols, ketones, or esters) to the adhesive, maintaining a 1:1-1.5 volume ratio between adhesive and solvent.
- The diluted adhesive can be evenly sprayed or applied onto a substrate to form a thin film.
For metal substrates, plasma or laser heating can be applied to improve bonding. By raising the surface temperature above 1000°C, this process enhances adhesion between the film and the surface. Consequently, the film bonds more closely to the substrate.
This SiBCN composite adhesive not only boasts excellent ultra-high heat resistance but is also easy to prepare and use.
About SIOResin (SIO New Material)
SIOResin is a leading company in China specializing in the development and production of new materials. We manufacture and supply high-quality water-based silicone resins, silicone-modified polyesters, water-based polyurethanes, water-based acrylics, UV resins, liquid silicone rubber, intumescent fireproof coatings, flame retardants, wetting agents, curing agents, associative thickeners, driers, soft-touch agents, and other additives. Our products have a wide range of applications and with competitive prices.
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