In the process of continuous upgrading towards high-performance and multi-functionalization in industries such as amino varnishing, polyurethane coatings, and resin synthesis, organic silicon intermediates with both chemical reactivity and surface performance imparting capabilities are becoming key elements for achieving precise material modification and upgrading of coating functions. Our company's product, 5861, an alcohol hydroxyl end-capped long-chain alkyl silicone oil, as an organic silicon oligomer with hydroxyl functional groups, demonstrates significant industrial application value in applications such as resin synthesis end-capping modification, amino varnishing performance optimization, and coating anti-stain and anti-adhesion. It provides precise and efficient modification solutions for the development of high-performance coatings and resin materials.


I. Core Structural Characteristics and Physical Properties of the Product


Product 5861, an alcohol hydroxyl end-capped long-chain alkyl silicone oil, is a colorless to slightly yellow transparent liquid with an average molecular weight of approximately 1300, a hydroxyl value content of 0.50 ± 0.10%, and a solid content of no less than 98.00%. Its viscosity at 25 degrees Celsius is 200 to 800 centistokes, and its refractive index is 1.4300 ± 0.0050. One end of its molecular structure is reactive hydroxyl groups, and the other end is inert long-chain alkyl groups, belonging to a typical single-end functionalized organic silicon oligomer. This "reactive at one end and protective at the other" structural design enables it to precisely introduce organic silicon segments at the polymer chain ends during reactions with isocyanate groups or carboxyl groups without causing cross-linking or gelation risks.


II. Core Reaction Characteristics and Functional Advantages


The application value of product 5861 is mainly reflected in its single-end hydroxyl group's precise reaction characteristics. This hydroxyl group has high reactivity with isocyanate groups or carboxyl groups, and can be used as an efficient end-capping agent when added at the later stage of polyurethane resin synthesis. It can anchor the long-chain alkyl silicone oxygen structure in the polymer chain ends through a covalent bond. This chemical bonding method provides durable and stable performance improvements for the modified resin, avoiding common migration and precipitation problems in physical blending. Through this design, the modified resin or coating can achieve multiple advantages in surface performance: providing excellent anti-drawing performance, making oil-based pens and other stains easier to clean; significantly improving the hand feel and smoothness of the resin or coating; and effectively preventing material adhesion during processing and storage. Additionally, its low surface tension property can promote coating leveling and flow, effectively reducing defects such as run-off and shrinkage.


III. Main Application Domains and Usage Methods


Product 5861, with its precise modification capabilities and wide adaptability, plays an important role in the following key application domains:


1. Amino varnishing and two-component polyurethane coatings. In the amino varnishing system, this product can be directly added to the resin at a concentration of 0.5% to 2.0% and dispersed evenly. Due to its good compatibility, it is suitable for most amino, polyurethane, and ink systems, effectively enhancing the anti-drawing performance, smooth hand feel, and anti-adhesion of the paint film, and improving the leveling effect.


2. Synthesis of organic silicon modified polyurethane resins and emulsions. This product can be added at the later stage of polyurethane resin synthesis as an end-capping agent to react with isocyanate groups. Compared to dual-end hydroxyl silicone oil, the single-end structure does not cause excessive resin cross-linking or viscosity increase, providing stronger production stability, and is suitable for water-based polyurethane emulsions, artificial leather coating, and other systems.


3. Additive silicone rubber products and inks. In additive silicone rubber, adding this product can improve demolding performance, surface smoothness, and anti-stain ability; for ink formulations, it can enhance the scratch resistance and smoothness of printed products.


4. Quality Assurance and Industry Chain Value


Product 5861, a long-chain alkyl silicone oil with mono-terminated hydroxyl groups, has established a strict quality control system during the production process. Key indicators such as product appearance, hydroxyl value content, solid content, viscosity, and refractive index are all subject to full-process testing to ensure consistency and reliability between batches. As the downstream industries such as home appliances, automobiles, and furniture continue to raise requirements for the comprehensive performance of coatings, including anti-fouling, hand feel, and weather resistance, this product, with its precise mono-end reaction structure, low surface tension characteristics, and "reaction at one end and protection at the other" molecular design, is becoming an important additive option in fields such as amino varnish, polyurethane resins, and inks. It provides strong raw material support for promoting product upgrades and process optimizations in related industries.