In the process of continuous development towards functionalization and refinement in fields such as silicone rubber processing, silane coupling agent synthesis, and organic silicone modified materials, the end-hydroxyl polydimethylsiloxane intermediate, which combines reactive properties with the basic characteristics of organic silicon, is becoming a key raw material for downstream silicone rubber structure control agents, silicon functional silanes, and organic modified materials. Our company's product, linear hydroxyl silicone oil 1203M, as a colorless transparent linear polydimethylsiloxane, with its precisely controlled viscosity and hydroxyl content specifications, low moisture content, and high purity characteristics, demonstrates significant industrial application value in silicone rubber additives, silicon functional silanes synthesis, and organic silicone modified materials. It provides high-performance active intermediates for customers in various industries.


1. Product Series Specifications and Core Physical and Chemical Characteristics


Product linear hydroxyl silicone oil 1203M is a colorless transparent oily liquid, providing two standard viscosity specifications to meet different application needs. The A specification has a viscosity of 60 to 70 square millimeters per second at 25 degrees Celsius, with a hydroxyl content of 1.1% to 2.0%; the B specification has a viscosity of 95 to 105 square millimeters per second, with a hydroxyl content of 0.8% to 0.9%. Both specifications have a moisture content of no more than 0.5%. The product's molecular chain ends have active hydroxyl groups, belonging to a typical end-hydroxyl linear polydimethylsiloxane, with the hydroxyl content and viscosity showing a negative correlation. The low moisture content is a key indicator for ensuring stability during subsequent reactions and storage, effectively avoiding the consumption of hydroxyl groups and the occurrence of side reactions.


2. Core Reaction Characteristics and Application Value


The application value of product linear hydroxyl silicone oil 1203M stems from the chemical reaction capabilities of the active hydroxyl groups at both ends of the molecule. This end-hydroxyl can react with various functional groups under appropriate conditions, serving as a key driving force for introducing the target molecular structure into the organic silicon chain segments.


In the field of silicone rubber processing, this product can be used as a structure control agent for silicone rubber. During the mixing process of silicone rubber, the active silicon hydroxyl groups on the surface of air-phase silica fume will cause the rubber to gradually harden during storage, a phenomenon known as structureization. The hydroxyl groups at both ends of the product can preferentially form hydrogen bonds or undergo condensation reactions with the hydroxyl groups on the surface of silica fume, effectively钝化 the active sites on the filler surface， thereby significantly inhibiting the structureization process and maintaining the processing fluidity of the rubber.


In the field of silicon functional silane synthesis， this product can be used as a raw material to react with chlorosilanes and other compounds to produce other silicon functional silanes， or for the modification of other organic substances. Through the reaction of hydroxyl groups with isocyanate groups， carboxyl groups， etc.， the organic silicon chain segments can be introduced into the main chain of the organic polymer.


3. Main Application Areas


Product linear hydroxyl silicone oil 1203M， with its precise specifications and reactive properties， can play an important role in the following key application areas：


1. Structure control agent and additive for silicone rubber processing. This product is an important structure control agent in the mixing process of high-temperature vulcanized silicone rubber (HTV) and room-temperature vulcanized silicone rubber (RTV)， effectively inhibiting the structureization of silica fume and significantly reducing the Melt Index of the mixed rubber， extending the safe storage time of the rubber， improving processing fluidity， and enhancing the transparency and mechanical properties of the products.


2. Raw material for silicon functional silanes and organic modified materials synthesis. This product can be used to synthesize other silicon functional silanes or for the modification of other organic substances， introducing the organic silicon chain segments into the target molecule through the reaction of hydroxyl groups with functional groups such as isocyanate groups and carboxyl groups， improving the surface properties， weather resistance， and flexibility of the organic materials.


3. Dilution and performance adjustment for silicone rubber. In addition-curing or condensation-type silicone rubber formulations， this product can be used as a viscosity regulator， and its end-hydroxyl groups can participate in the cross-linking reaction， positively influencing the final product's mechanical properties while adjusting the viscosity of the system.
IV. Selection Reference


A specification (viscosity 60 to 70 square millimeters per second, hydroxyl content 1.1 to 2.0%) has a higher hydroxyl content and stronger reactivity, making it suitable for use as a high-reactivity structural control agent and chemical synthesis raw material. B specification (viscosity 95 to 105 square millimeters per second, hydroxyl content 0.8 to 0.9%) has a moderate hydroxyl content and is suitable for use as a general-purpose structural control agent and viscosity regulator.


V. Packaging Specifications and Storage Conditions


Product linear hydroxyl silicone oil 1203M is packaged in 200-kilogram iron drums. It should be placed in clean, dry containers and stored in a ventilated, dry warehouse.


VI. Quality Assurance and Industry Chain Value


Product linear hydroxyl silicone oil 1203M has established a strict quality control system during the production process. Key indicators such as product appearance, viscosity, hydroxyl content, and moisture are tested throughout the process to ensure consistency and reliability between batches. As the silicone rubber, organic silicon modified materials, and special silane industries continue to develop towards high-performance and refinement, the demand for end-hydroxyl polysiloxane intermediates with both reactive properties and precise specifications is steadily increasing. This product, with its series design of two precise viscosity and hydroxyl content specifications, high-purity quality with low moisture content, and wide adaptability as an active intermediate, is becoming an important raw material option for customers in the silicon rubber processing and organic silicon synthesis fields. It provides strong raw material support for promoting the product quality improvement and performance upgrade in related industries.