In the continuous upgrading of synthetic resins such as polyurethane, polyester, and amino resins toward higher performance and functionality, how to precisely introduce the unique properties of organosilicon through chemical bonding into the resin main chain, rather than just physical blending, has become the core technical path for material modification. Traditional hydroxy silicone oil, though reactive, forms Si-O-C bonds with isocyanate that are prone to hydrolysis under humid conditions, limiting long-term durability; while inert polysiloxane cannot participate in main-chain reaction, making modification effects hard to sustain. With escalating demands for "resin modifiers with stringent softness requirements", sourcing a "carbon hydroxyl-modified silicone oil with mono-end dihydroxyl, high purity, reacting with isocyanates to yield high-quality silicone/PU copolymers" reactive modifier has become the core proposition in synthetic resin functionalization. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. officially launches IOTA 28130 Carbon Hydroxyl-Modified Silicone Oil. Characterized by "colorless to slightly yellow, transparent to slightly turbid liquid; functionality 2; MW 3000; hydroxyl value 30mgKOH/g; 20L & 200L iron drum packaging; sealed storage in dry cool place, avoid acid/base, away from fire; 24-month shelf life", backed by "alkoxy-carbonyl hydroxyl + mono-end dihydroxyl + MW3000 moderate chain segment + high reactivity with isocyanate", it serves as the "flex-chassis" for high-softness resin modification. Molecular Architecture: Polysiloxane Backbone + Alkoxy-Carbonyl Hydroxyl + Mono-End Dihydroxyl

• Alkoxy-Carbonyl Hydroxyl Active Center: Unlike traditional silanol (-Si-OH), 28130's hydroxyl connects to silicon via carbon atoms, forming a stable Si-C bond. This hydroxyl reacts with isocyanate (-NCO) to embed polysiloxane segments into PU main-chain or side-chain via chemical bonds. The Si-C bond energy exceeds that of Si-O-C, granting modified materials superior hydrolysis stability.
• Mono-End Dihydroxyl Design: Two hydroxyl groups concentrated at one end, functionality 2. This design provides sufficient reactivity while fundamentally avoiding the migration and precipitation issues common in physical blending — the modification effect is durable and stable. Meanwhile, the mono-end dihydroxyl structure enables it to act as chain extender or comonomer in polymerization.
• MW3000 Moderate Segment: The MW3000 design provides an appropriate chain segment length, effectively exerting organosilicone hydrophobicity and softening characteristics while maintaining good compatibility with various resin systems. Hydroxyl value 30mgKOH/g corresponds to precise active site density, ensuring controllable stoichiometry with isocyanate.

Performance Leap: From "Physical Blending" to "Chemically Bonded Precise Modification"

• Softness & Fold-Resistance Dual Boost: Polysiloxane segment introduction significantly improves material softness and fold resistance, imparting delicate hand-feel, especially suitable for resin systems with stringent softness requirements.
• Anti-Graffiti & Lubricity: The automatic surface attraction effect of organosilicone gives 28130-modified materials excellent anti-graffiti and lubricity.
• Moisture Permeability & Breathability: While providing hydrophobicity, it maintains good moisture permeability, giving modified materials comfort advantages in textile and leather applications.
• Abrasion & Scratch Resistance: Organosilicone segments lower the surface friction coefficient, significantly improving wear and scratch resistance.
• Compatibility & Hydrophobicity: Maintains good compatibility with various resin systems while significantly enhancing surface hydrophobicity.

Application Penetration: From Silicone-Modified PU to High-End Leather Coating

• Silicone-Modified PU Copolymer (Main Battlefield): Reacts with isocyanate to synthesize silicone-modified PU copolymers for PU coatings, adhesives, and elastomers; modified PU significantly improves surface hydrophobicity, stain resistance, and hand-feel while retaining original mechanical properties.
• Polyester & PU Acrylate Resin Modification: Participates in copolymerization, introducing organosilicone segments into resin main chain, imparting good hand-feel, slip, improved wear resistance and anti-blocking.
• 2K PU & Amino Baking Enamels: Significantly improves coating slip, anti-blocking, and surface hydrophobicity while enhancing leveling and appearance quality.
• High-Softness Resin Modification: As resin modifier for high softness requirements, comprehensively enhances synthetic resin softness, fold resistance, lubricity, breathability, compatibility, abrasion resistance, and hydrophobicity.
• Textile & Leather: Used in synthetic leather base and top coat, imparting better moisture permeability, breathability, low-temperature flexibility, anti-blocking, and abrasion resistance; suitable for high-end leather goods and high-performance textiles (waterproof fabric, tents, hardshell jackets).

IOTA Technical Guide: Sealed Avoid Acid/Base, 24-Month Shelf Life

• Application: In PU synthesis, react 28130 with isocyanate to synthesize silicone-modified PU copolymer; as resin modifier, add per formulation ratio into synthetic resin system, dosage adjusted per performance requirement.
• ⚠️ Taboo: Avoid contact with acid and alkali — terminal hydroxyl is sensitive to acid/alkali, unintended condensation may occur upon mixing; keep away from fire.
• Storage: Sealed packaging stored in dry cool place, avoid acid/base contact, away from fire; effective storage period 24 months.
• Packaging: 20L & 200L iron drum packaging and other options; non-hazardous, routine transport.

Industry Insight: Carbon hydroxyl silicone oil reacts with isocyanate groups in PU systems to introduce polysiloxane segments, significantly improving water resistance (e.g., 2% addition raises coating water contact angle from 82° to 103°, reduces water absorption by ~50%), flexibility, abrasion resistance, hand-feel, breathability, while enhancing weathering and low-temperature performance. IOTA 28130, with "mono-end dihydroxyl + MW3000 + hydroxyl value 30 + hydrolysis-stable alkoxy-carbonyl hydroxyl", fills the key supply chain link for domestic reactive carbon hydroxyl-modified silicone oil in high-softness resin modification, providing import-substitution for downstream synthetic resin, PU coating, adhesive, and synthetic leather enterprises (benchmarking international products like Shin-Etsu KF-6001/6002, Dow Corning BY26-201). This confirms domestic functional silicone oils are leaping toward "hydrolysis-stable reactive carbon hydroxyl silicone oil", with growing technical say in reactive resin modifier field.