In the process of the continuous development of organic silicon materials towards functionalization and refinement, the active design of the end groups of the molecular chains has become a core element for expanding the application boundaries of silicone oils and achieving customized material performance. The product hydroxyl silicone oil, as a polydimethylsiloxane with active hydroxyl groups at both ends of the molecular chain,凭借 its dual advantages of excellent comprehensive performance of methyl silicone oil and the chemical reaction activity of the hydroxyl groups， as well as a wide viscosity range and flexible crosslinking curing characteristics， has demonstrated significant industrial application value in numerous fields such as paper anti-adhesion treatment， power insulation， room-temperature vulcanized silicone rubber-based adhesives， silicone rubber structure control， and daily chemical emulsification， providing high-performance multi-functional organic silicon basic raw materials for various industry customers.


I. Core Physical and Chemical Properties and Series Specifications of the Product


The product hydroxyl silicone oil is a colorless transparent liquid， with the chemical name being α，ω-dihydroxy polydimethylsiloxane. The viscosity range is from twenty-five to one hundred thousand millipascal-seconds， and it can be customized according to user requirements. The hydroxyl content is directly related to the viscosity， generally ranging from 0.5% to 3%. In addition to the general performance of methyl silicone oil， this product also has the chemical reaction activity of hydroxyl groups， which can be used to make some new materials or crosslink into elastic bodies (or membranes). It has good electrical insulation and resistance to high and low temperatures， and can be used at temperatures ranging from minus fifty to two hundred and fifty degrees Celsius for a long time； it has a high flash point， a low freezing point， a small viscosity coefficient， a large compression ratio， and a low surface tension， and has good hydrophobic and moisture-proof properties， chemical inertness， and physiological inertness. Traditionally， hydroxyl silicone oil with a viscosity of more than two thousand five hundred millipascal-seconds is called 107 silicone rubber.


II. Core Reaction Characteristics and Application Value


The application value of the product hydroxyl silicone oil stems from the chemical reaction ability of the active hydroxyl groups at both ends of the molecular chain. Under appropriate conditions (such as the curing process of condensation-type room-temperature vulcanized silicone rubber)， the active hydroxyl groups can undergo condensation reactions to form a three-dimensional network structure， thereby achieving crosslinking and curing； in silicone rubber processing， the active hydroxyl groups can react with the silicon hydroxyl groups on the surface of silica fume， effectively reducing the interaction between the filler and the rubber； in paper anti-adhesion treatment， it needs to be used in combination with coupling agents to chemically bond the hydroxyl silicone oil to the substrate surface to achieve a long-lasting anti-adhesion effect.


III. Wide Application Domains


The product hydroxyl silicone oil， with its rich specification selection and active hydroxyl reaction activity， can play an important role in the following key application domains， specifically including：


1. Paper anti-adhesion treatment. Medium and high-viscosity hydroxyl silicone oil products can be used as the base glue for paper anti-adhesion agents， and the cured film has good anti-adhesion effects. For example， the treatment of label base paper， asphalt packaging paper， sealing paper tape base paper， and decoration paper base paper， through the synergistic effect of the curing agent and coupling agent， forms a long-lasting anti-adhesion coating on the substrate surface.


2. Power electrical insulation materials. It is used in the power electrical industry as the main component of insulating paint or as a component of insulators， exerting its excellent insulation performance and heat resistance.


3. Condensation-type room-temperature vulcanized silicone rubber base glue and diluent. It is used as the base glue and diluent for condensation-type room-temperature vulcanized silicone rubber， such as sealants and mold adhesives. By combining with crosslinking agents and catalysts， it can crosslink and cure into an elastic body at room temperature， widely used in building sealing， electronic encapsulation， and mold manufacturing.


4. Silicone rubber structure control agent. Small-molecule hydroxyl silicone oil (25 to 30 centipoises， with a hydroxyl content of about 8%) is a structure control agent for silicone rubber， which can replace diphenyl dihydroxy silicone， simplifying the processing technology， improving processing performance， eliminating the heat treatment step， and increasing the transparency of the product.


5. Daily chemical emulsification and personal care product applications. Hydroxyl silicone oil is more easily emulsified than ordinary dimethyl silicone oil， and can be used to formulate various skin care products and hair care products， giving the skin a soft and smooth touch， improving the luster and manageability of hair.


VI. Other Applications for Substituting Dimethyl Silicone Oil. Hydroxyl silicone oil can be used as a substitute in many traditional applications of dimethyl silicone oil. Additionally, due to the reactive nature of the terminal hydroxyl groups, it can also provide additional crosslinking curing or chemical bonding capabilities for the final product.


IV. Usage, Dosage, and Process Recommendations


Hydroxyl silicone oil is generally used in combination with a curing agent to achieve crosslinking and curing. When used for anti-stick paper, a coupling agent must also be used for fixation. Generally, the amount of the curing agent accounts for 3% to 5% of the base glue, and the amount of the coupling agent accounts for 0.5% to 1% of the base glue. In most cases, the base glue should be diluted ten times with a solvent before adding the curing agent and coupling agent, mixed evenly, and then applied to the substrate surface. It can be cured at room temperature or heated. For sealants and mold adhesives, no solvent is required. After adding the curing agent, mix well, and after defoaming, it can cure within 30 to 120 minutes.


V. Precautions


Hydroxyl silicone oil should not be mixed with acidic or alkaline substances, alkoxysilanes, or water vapor at high temperatures. Otherwise, there is a tendency for curing and viscosity changes. The appropriate viscosity product should be selected based on the specific application scenario to ensure the best performance.


VI. Quality Assurance and Industry Value


The product hydroxyl silicone oil has established a strict quality control system during the production process. Key indicators such as product appearance, viscosity, and hydroxyl content are tested throughout the process to ensure consistency and reliability between batches. As the demand for organic silicon raw materials with both basic performance and reactive properties continues to grow in downstream industries such as paper anti-stick, power insulation, room-temperature vulcanized silicone rubber, and silicone rubber processing, the product hydroxyl silicone oil, with its wide viscosity selection range, reactive hydroxyl groups, and stable quality performance, is becoming an important solution for customers in various fields in the selection of organic silicon base raw materials, providing strong raw material support for promoting product innovation and technological upgrading in the downstream industries.