Various Methods of Organosilicon Lotion Polymerization

Conventional Organosilicon Lotion Polymerization

Conventional organosilicon lotion polymerization involves the direct addition of silicone monomer, acrylate monomer, water-soluble emulsifier, and water-soluble initiator to water for the reaction. By copolymerizing octamethylcyclotetrasilane and methacryloxypropyl trimethoxysilane with acrylate, a stable silicone-modified acrylate lotion is obtained. The effect of different feeding methods on the lotion's stability was investigated, revealing that only semi-continuous feeding yields lotion with good stability and uniform particle size. Additionally, conventional lotion polymerization utilizing reactive emulsifier sodium alkyl vinyl sulfonate (DNS-86) and silicone monomer allows for the synthesis of silicone-modified acrylic acid copolymerization lotion. The lotion's surface tension, stability, and rheological properties were studied, showing that the silicone acrylic lotion's surface tension decreases with an increase in the amount of silicone monomer. Moreover, the lotion's apparent viscosity decreases with a higher silicone content, while exhibiting good freeze-thaw stability and storage stability.

Soap-Free Emulsion Polymerization

Soap-free lotion polymerization is an innovative technology developed based on traditional lotion polymerization. It refers to polymerization processes where no emulsifier is added or only a minimal amount of emulsifier (below the critical micelle concentration, CMC) is used. Soap-free lotion polymerization overcomes the drawbacks of traditional lotion polymerization, such as excessive foam, easy bleeding and moisture absorption caused by emulsifiers that cannot be removed. This method allows for the production of latex particles with a clean surface, improving film transparency, density, adhesion, water resistance, as well as optical and electrical properties.

The presence of small molecular emulsifiers in organosilicon acrylate lotion polymerization can reduce the density, water resistance, and physical and mechanical properties of the polymer film, while also causing environmental pollution. To address these issues, soap-free lotion polymerization is adopted. This method involves using emulsifiers with reactive functional groups or those capable of participating in the polymerization reaction. As a result, the need for conventional emulsifiers is completely eliminated or significantly reduced (to concentrations below the critical micelle concentration, CMC), eliminating the negative effects associated with conventional emulsifiers. Lotions prepared through soap-free polymerization offer numerous advantages over traditional lotion polymerization, including excellent water resistance, solvent resistance, chemical inertness, and have gained significant attention in recent years.

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