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Sep 04, 2023

Method for Modifying Nitrogen Carbon Resin with Organosilicon

Modifying nitrogen carbon resin with organic silicon can be accomplished through two primary methods: physical blending and chemical polymerization. Physical blending involves the direct addition of organic silicone resin to the carbon resin for modification, while chemical polymerization entails introducing silicon-containing groups into the main chain of organic nitrogen carbon polymers through copolymerization with silicon-containing or other compatible monomers. This process results in the formation of block, graft, or interpenetrating network copolymers, achieving the desired modification. Generally, chemical polymerization modification yields superior results compared to physical blending.

Physical Blending Methods:

  1. Direct Blending: Begin by taking a specific quantity of carbon-coated resin (e.g., ZB-200 with a solid content of 53% and a nitrogen content of 19%). Combine it with organic silicone resin (e.g., 290, 28N from Wacker Chemical Company) and mix them thoroughly in a high-speed dispersion machine using a mixed solution of butyl acetate, ethyl acetate, and cyclohexanone. During this process, incorporate a promoter as needed. Next, add the drying agent dibutyltin dilaurate and the curing agent hexamethylene diisocyanate dimer in appropriate proportions. Mature the mixture at room temperature for 30 minutes to obtain a nitrogen silicon coating.

  2. Alternative Blending: Another physical modification method involves copolymerizing tetramethylethylene monomer, vinyl acetate, allyl alcohol, and undecanoic acid to produce a nitrogen silicone resin. When the resin's solid content reaches 50%, with a nitrogen content of 35%, blend this resin with a Shanghai end light organic silicone resin having a molecular weight of 5.0x1. Incorporate gas-phase silica, polytetraethylene powder, and other additives into the mixture. Utilize high-speed stirring dispersion and grinding discharge while adding a suitable solvent to achieve a nitrogen silicon coating. Combine the coating with one or more curing agents, such as biuret, HDI trimer, or organic tin, in specific proportions along with a solvent to solidify into a film. Upon drying, the silicone material's low surface characteristics will yield hydrophobic and oil-repellent properties, making it non-sticky to water-based and oily substances. This coating can be forcibly cured at medium temperature or air-dried at room temperature, demonstrating resistance to outdoor aging for up to 20 years. It is suitable for various substrates, including cement, metal, plastic, wood, ceramic, and more.

In summary, organosilicon modification of nitrogen carbon resin can be achieved through physical blending methods. By carefully combining specific resin components and additives, you can create coatings with desirable properties, such as hydrophobicity and oil repellency, suitable for a range of applications and substrates.

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