Breakthrough in Preparation Technology of Ultra-High Molecular Weight Hydroxyl Silicone Oil, Green and Efficient Process Leads Industrial Upgrade

(Special Report) Recently, a domestic research team, in collaboration with relevant enterprises, has successfully developed a gradient temperature-rising polymerization method and supporting system for ultra-high molecular weight hydroxyl silicone oil. This technology breaks through many bottlenecks of traditional preparation processes, achieves dual improvement in product quality and production efficiency, and practices the concept of green and low carbon, injecting strong momentum into the transformation of the hydroxyl silicone oil industry towards high-end and green development. It marks a crucial step forward for China in the field of functional organosilicon intermediate preparation. It is understood that as a key intermediate in the organosilicon material system, the molecular weight, hydroxyl content and purity of hydroxyl silicone oil directly determine the performance of downstream products. Among them, ultra-high molecular weight hydroxyl silicone oil has a growing market demand due to its unique application value in high-end silicone rubber, electronic packaging, aerospace and other fields. However, traditional preparation processes have long had problems such as wide molecular weight distribution, low polymerization efficiency, poor stability and inaccurate process control, making it difficult to meet the strict requirements of high-end fields. Previously, most domestic ultra-high molecular weight hydroxyl silicone oil products relied on imports, and the core preparation technology was monopolized by international giants, which not only had high prices but also posed risks of supply chain constraints. The newly developed gradient temperature-rising polymerization technology specifically addresses the pain points of traditional processes, adopting a full-process precise control mode of "raw material pretreatment - three-stage gradient temperature-rising polymerization - post-treatment". In the raw material pretreatment stage, octamethylcyclotetrasiloxane, deionized water and composite catalyst are accurately mixed to ensure the uniformity of reaction raw materials; in the polymerization stage, through PLC temperature control and online monitoring system, combined with pressure regulation and regular water replenishment technology, three-stage gradient temperature-rising reaction is realized to effectively control the polymerization degree and molecular structure regularity; in the post-treatment stage, acetic acid neutralization and inert gas purging technology are used to remove low-boiling substances, combined with a low-boiling substance removal device with stainless steel corrugated packing, greatly reducing the impurity content of products. According to the detection by authoritative institutions, the ultra-high molecular weight hydroxyl silicone oil prepared by this technology has a molecular weight distribution index ≤1.3, a hydroxyl retention rate ≥95%, and a low-boiling residue ≤0.1%, and all performance indicators have reached the international advanced level. At the same time, this process does not require high temperature and high pressure conditions, energy consumption is reduced by more than 30% compared with traditional processes, no harmful by-products are generated, and the catalyst can be recycled, truly realizing green and efficient production. In addition, the supporting production system includes a raw material pretreatment unit, a polymerization reaction unit and a post-treatment unit, realizing full-process automatic control, which greatly improves production efficiency and ensures product batch stability. Industry experts said that the successful implementation of this technology has broken the international technological monopoly and filled the gap in the green preparation of ultra-high molecular weight hydroxyl silicone oil in China. It not only reduces the dependence of China's high-end fields on imported products but also promotes the transformation of the hydroxyl silicone oil industry from "scale expansion" to "quality leadership". With the large-scale promotion and application of this technology, it will further drive the upgrading of downstream high-end silicone rubber, electronic insulation materials and other industries, providing key support for China's organosilicon industry to achieve a leap in the global value chain. According to the prediction of the China Fluorosilicone Organic Materials Industry Association, relying on this technology, the market scale of China's ultra-high molecular weight hydroxyl silicone oil will maintain a growth rate of more than 15% in the next three years, and gradually occupy a dominant position in the global high-end market.