Two Major Silicone Oil Molding Processes: Precisely Matching Universal and High-End Application Scenarios

In the previous industry mass production system, hydrolysis condensation method and catalytic equilibrium polymerization method were the two mainstream production processes. The two processes rely on differentiated reaction principles and production control logic to form a clear market segmentation, corresponding to the large-scale production of general-purpose silicone oil and customized manufacturing of high-end functional silicone oil, respectively. They show significant differentiation characteristics in process controllability, product comprehensive performance, production cost, and scene adaptation.

1、 Hydrolysis condensation method: mainstream process for mass production of universal silicone oil

The hydrolysis condensation method is the most mature and widely used traditional preparation process in the organic silicon industry, mainly suitable for the large-scale production of common methyl silicone oil, textile modified silicone oil, industrial lubricating silicone oil, demolding silicone oil and other low-end universal products.

This process uses high-purity dimethyldichlorosilane monomer as the core raw material, which undergoes hydrolysis reaction with quantitative pure water to generate silanol intermediates and by-product hydrochloric acid. Then, linear siloxane molecular chains are polymerized through dehydration condensation reaction to finally produce crude silicone oil. The entire production process principle is simple, the equipment adaptability is wide, the production pace is fast, and it has strong capacity for large-scale production. The comprehensive production cost is controllable, and it is highly adaptable to standardized and large-scale shipping needs. It is also the mainstream preparation method for industrial silicone oil currently available on the market.

Due to the limitations of the reaction mechanism, the hydrolysis condensation method has natural technical shortcomings. The overall hydrolysis reaction has strong randomness, poor uniformity of molecular chain growth, and is prone to generating branched structures. At the same time, the finished product is prone to residual active hydroxyl groups and small molecule impurities. This leads to weak temperature resistance and chemical stability of the finished silicone oil, high volatile matter content, insufficient batch precision, and can only meet common working conditions such as conventional industrial lubrication, demolding processing, and textile additive modification. It cannot adapt to harsh application scenarios such as medical, food, precision electronics, and new energy with high purity, high stability, and high weather resistance.

2、 Catalytic equilibrium polymerization method: core preparation technology for high-end refined silicone oil

In response to the industry pain points of insufficient purity, poor stability, and low performance limit of hydrolysis condensation products, catalytic equilibrium polymerization has become the core process of high-end refined silicone oil production and the core direction of industry process upgrading. This process is widely used in the customized production of high-purity insulating silicone oil, new energy specific silicone oil, medical grade silicone oil, and various functional modified silicone oils, and is the core guarantee for silicone oil raw materials in the high-end manufacturing field.

This process uses high-purity siloxane rings purified by multi-stage distillation as the main raw material, combined with precise end capping with hexamethyldisiloxane (MM), to lock the molecular chain structure and length from the source and avoid ineffective side reactions. The entire polymerization reaction is carried out in a high-precision reaction system with closed constant temperature and pressure. By accurately proportioning acid-base composite catalysts, the equilibrium polymerization reaction can be controlled. The production end can flexibly adjust the reaction temperature, reaction time, and catalyst dosage according to product application requirements, and accurately customize high-end silicone oil products with different viscosities, molecular structures, and functional characteristics.

After the polymerization reaction is completed, the material needs to undergo post-treatment processes such as neutralization and de catalysis, vacuum distillation, and multi-stage precision filtration to completely remove catalyst residues, unreacted monomers, and small molecule volatile impurities, achieving high-purity purification of the product. The silicone oil prepared by catalytic equilibrium polymerization method has core advantages such as uniform molecular weight distribution, no excess active groups, low volatility, high temperature resistance, high weather resistance, and strong batch consistency. It completely fills the performance gap of traditional processes and can stably adapt to harsh application scenarios such as new energy working conditions, precision electronic manufacturing, medical health, and high-end equipment protection.

Process summary: Dual process complementarity, covering all scene requirements

Overall, the hydrolysis shrinkage method focuses on low cost, high mass production efficiency, and is suitable for general standardization scenarios; The catalytic equilibrium polymerization method focuses on high precision, high purity, and high stability, targeting the high-end customized market. The effective complementarity between the two processes has established a comprehensive production system for the silicone oil industry, from ordinary industrial applications to high-end precision manufacturing. It has also become the core technical standard for distinguishing the grades and application levels of silicone oil products.