In HTV silicone rubber processing, liquid silicone rubber preparation, and organic material modification, while traditional vinyl-terminated silicone oils offer high reactivity, their end-only reaction characteristic creates a dilemma where "molecular weight - vinyl distribution - viscosity" are difficult to balance when used as hardening agents, diluents, or modifiers. For instance, when large-molecule high-viscosity 110-2 silicone rubber requires hardening or pre-vulcanization dilution, vinyl groups of end-terminated oils are all distributed at chain ends, easily causing locally over-dense crosslinking networks and poor overall uniformity during vulcanization; when used as modifiers for acrylic resins or vinyl acetate resins, the compatibility of terminal vinyl groups with organic phases is limited, restricting grafting efficiency. With escalating demands for active silicone oils featuring "pendant vinyl side chains, branched topology, freely configurable molecular weight/vinyl content, and multi-grade viscosity options", sourcing a key modifier with "side-chain vinyl + branched skeleton + free configuration" has become the core gap for domestic silicone rubber and polymer modification localization. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. officially launches IOTA 272 Branched Vinyl Silicone Oil (Alias: Vinyl Silicone Oil; Chemical Name: Branched Vinyl Silicone Oil). Characterized by "colorless or pale yellow transparent liquid; viscosity (25℃) 250-500/1000-1500/2500-3000 mPa·s three grades; vinyl content 2-3%/0.5-0.8% two grades; PH 6-8; 200kg coated iron drum or 50kg polyethylene plastic drum packaging; non-hazardous", backed by "branched polysiloxane skeleton + pendant vinyl side chains + freely configurable molecular weight/vinyl content + multi-grade viscosity", it serves as the "side-chain active choice" for silicone rubber hardening/dilution and organic material modification, achieving the leap from "end-only reaction" to "side-chain multi-point anchoring". Molecular Architecture: Branched Skeleton + Pendant Vinyl Side Chains + Free Configuration

• Branched Skeleton & Pendant Vinyl Side Chains: Different from traditional linear vinyl-terminated silicone oils, the vinyl groups of 272 are located in the middle of molecular chains, forming a branched topology. This structure distributes vinyl reactive sites at different positions along the main chain. When participating in addition or free radical reactions, it enables "multi-point anchoring", resulting in a more uniform crosslinking network and avoiding the local over-crosslinking issues common with end-terminated products.
• Freely Configurable MW & Vinyl Content: Offering three viscosity grades (250-500, 1000-1500, 2500-3000 mPa·s) and two vinyl content grades (2-3%, 0.5-0.8%) for free combination, enabling "on-demand customization" to precisely match silicone rubber systems with different hardness and dilution requirements, as well as organic materials with varying modification depths.
• Universal Properties of Methyl Silicone Oil + Vinyl Activity: In addition to the general properties of methyl silicone oil (smoothness, softness, brightness, temperature/weather resistance), the pendant vinyl groups provide better compatibility with certain organic materials (such as acrylic resins and vinyl acetate resins), breaking the "inert and difficult to compatibilize" limitation of traditional methyl silicone oils and expanding the application boundary of silicone oils in polymer modification.

Performance Leap: From "End Single-Point Reaction" to "Side-Chain Multi-Point Anchoring"

• Dual Effect of Hardening & Dilution: As a hardening agent and pre-vulcanization diluent for large-molecule high-viscosity 110-2 silicone rubber, pendant vinyl groups participate in crosslinking to increase hardness while reducing initial system viscosity to improve processing fluidity; recommended dosage 10%-20% for significant effect.
• Efficient Organic Material Modification: As a modifier for acrylic resins and vinyl acetate resins, pendant vinyl groups undergo grafting or copolymerization, significantly improving weather resistance, aging resistance, and UV resistance; addition of 5%-10% achieves performance leap.
• Main Force as Silicone Rubber Base Gum: Used as base gum (50%-100% dosage) for HTV, medium-temperature vulcanized silicone rubber, and silicone gel, providing basic elasticity and reactivity to ensure mechanical strength and resilience of vulcanized products.
• Versatile Reaction Activity: Vinyl groups on the molecular chain can participate in various chemical reactions such as addition and free radical reactions, covering addition-cure, peroxide-vulcanized and other silicone rubber systems.

Application Penetration: From HTV Seals to Organic Coatings

• HTV Silicone Rubber Hardening & Dilution (Main Battlefield): For large-molecule high-viscosity silicone rubbers like 110-2, adding 272 for hardening and dilution improves compounding and vulcanization processes, widely used in seals, keypads, jackets, etc.
• Organic Material Modification: Used in acrylic resin, vinyl acetate resin coatings, adhesives, and coatings to improve weather resistance, aging resistance, and flexibility.
• Silicone Rubber/Gel Preparation: As base gum raw material for HTV, medium-temp vulcanized silicone rubber, and silicone gel, used in electronic potting, precision molds, medical products, etc.

IOTA Technical Guide: Avoid Impurities & Fire, Configure as Needed

• Application: Diluent 10%-20%, modifier 5%-10%, base gum 50%-100%. Add directly or with high-speed stirring for uniform dispersion.
• ⚠️ Taboo: Chemically active, no impurities (especially catalysts, acids/bases) during storage/transport; check if other materials may trigger chemical reactions during use; keep away from fire and sunlight.
• Storage: Non-hazardous storage/transport; store airtight at room temperature in dry, ventilated, cool place.
• Handling: Colorless or pale yellow transparent liquid, multi-viscosity options; use high-speed stirring for uniform dispersion; use up quickly after opening to avoid impurity contamination.

Industry Insight: Branched vinyl silicone oils break the reactive site limitation of traditional end-terminated vinyl silicone oils through "pendant vinyl side chains", and their "free configuration" enables precise control of silicone rubber processing and polymer modification. IOTA 272, with "branched skeleton + pendant vinyl + multi-grade viscosity/vinyl content + PH 6-8", fills the key supply chain link for domestic branched vinyl silicone oil in silicone rubber hardening/dilution and organic material modification, providing import-substitution for downstream enterprises. This confirms domestic functional silicone oils are leaping toward "branched intermediate vinyl" topology, with growing technical say in vinyl silicone oil intermediates.