In the process of continuously upgrading engineering plastics such as polycarbonate, polyester, and polyurethane towards higher performance and functionality, how to introduce the flexibility, weather resistance, and hydrophobicity of organosilicon into the main chain of polymers through molecular design has become a key technical path to break through the performance bottlenecks of traditional materials. The product series of phenolic end-modified silicone oil 28700 launched by our company, as a phenolic end-terminated linear polydimethylsiloxane, with its reactive phenolic groups providing chemical reactivity, excellent thermal stability, and a series of viscosity specification designs, demonstrates significant industrial application value in numerous fields such as polycarbonate modification, engineering plastic toughening, development of high-performance transparent materials, and formulation of lubricants, providing a precise and efficient solution for the targeted modification of high-performance polymer materials.


1. Product Series Specifications and Core Physical Properties


The product series of phenolic end-modified silicone oil 28700 provides four specifications: 28723, 28724, 28725, and 28729. They are all colorless to light brown transparent liquids. At 25 degrees Celsius, the densities of the four specifications range from 0.970 to 0.990 grams per cubic centimeter, the refractive indices range from 1.406 to 1.430, and the viscosities correspond to 60 to 120, 70 to 130, 100 to 160, and 190 to 230 square millimeters per second, with the volatility not exceeding one percent. The molecular chains at both ends of this product series are phenolic end-terminated, and the phenolic groups have strong reactivity and heat resistance. This series of viscosity specifications correspond to different chain lengths of polydimethylsiloxane segments, enabling formulation engineers to precisely select the most suitable silicone segment size according to the target modification effect.


2. Core Reaction Characteristics and Performance Advantages


The phenolic hydroxyl groups of the product series of phenolic end-modified silicone oil 28700 have unique reaction activity, which can react with the active groups in polycarbonate, polyester, and polyurethane polymers through chemical bonds, stably embedding the organosilicon segments into the polymer main chain or side chain. Compared with traditional physical blending modification, the chemical bonding method fundamentally avoids the migration and precipitation of modification agents during long-term use, endowing the modified materials with persistent and stable performance improvements. The phenolic structure itself has good thermal stability, giving the modified polymer materials better heat resistance and thermal oxidation stability.


In polycarbonate modification, the flexible silicon-oxygen chain segments introduced by this product through copolymerization can effectively reduce the cohesion between molecular chains, significantly improving the flexibility, impact resistance, heat resistance, aging resistance, and flame retardancy of polycarbonate. Studies have shown that the impact value of polycarbonate-polydimethylsiloxane copolymers increases with the increase in the length of the dimethylsiloxane chain segment. At the same time, the introduction of the siloxane chain segment gives the material better hydrophobicity and chemical medium resistance, effectively solving the application pain points of traditional polycarbonate in low-temperature toughness and susceptibility to stress cracking.


3. Wide Application Areas


The product series of phenolic end-modified silicone oil 28700 series can play an important role in the following key application areas, specifically including:


1. Copolymerization modification of polycarbonate. This product is the core raw material for producing silicone copolymer polycarbonate. When introduced during the polycarbonate polymerization process, it can significantly improve the flexibility, impact resistance, heat resistance, aging resistance, and flame retardancy of the material, while also improving the melt index and processing fluidity, and is widely used in high-end fields such as new energy vehicle components, consumer electronic casings, and 5G communication devices.


2. Toughening modification of engineering plastics. This product is suitable for toughening modification of polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyamide, and other engineering plastic systems, improving the low-temperature toughness and environmental stress cracking resistance of the material.


III. Copolymerization or blending modification of polyester and polyurethane. This product can be used for copolymerization or blending modification of polyester, polyurethane and other polymer resins. Through the reaction of phenolic hydroxyl groups with isocyanate groups, carboxyl groups and other functional groups, the organic silicon segments are introduced into the polymer network, improving the flexibility and surface properties of the material.


IV. Development of high-performance transparent materials. This product is suitable for the modification of transparent polycarbonate and other transparent engineering plastics. While significantly improving the impact resistance, it can maintain good optical transparency.


V. Preparation of lubricants and release agents. This product can also be used for the preparation of lubricants and release agents, etc. By taking advantage of its low surface energy and thermal stability, it provides good lubrication performance and release effect for the products.


IV. Packaging specifications and storage and transportation conditions


The 28700 series of end-phenolic group modified silicone oil is packaged in 25-liter, 200-liter inner-coated iron drums or 1000-liter IBC plastic drums. Each drum has a net weight of 20 kilograms, 200 kilograms or 1000 kilograms. This product is stored under normal temperature in a sealed state, with a validity period of 24 months from the production date. Customers should carefully read the product information, material safety data sheet and labels before use, familiarize themselves with the safety information, operation instructions and environmental impact of the product, and wear the corresponding personal protective equipment as required.


V. Quality assurance and industrial chain value


The 28700 series of end-phenolic group modified silicone oil has established a strict quality control system during the production process. Key indicators such as appearance, density, refractive index, viscosity and volatile matter are tested throughout the process to ensure consistency and reliability between batches. With the continuous growth of the demand for high-performance modified engineering plastics in strategic emerging industries such as new energy vehicles, consumer electronics and 5G communication, this product, thanks to its active phenolic group, chemical bonding ability, series viscosity specification design and stable quality performance, is becoming an important raw material option in the field of high-performance modification of engineering plastics, providing strong raw material support for promoting product innovation and technological upgrading in related industries.