Preparation method of linear alpha, omega-hydroxyl-terminated polydimethylsiloxane oligomer

• Main Authors: YAO LEI, QU JIANXING, SHA HAIDONG
• Format: Patent
• Language: Chinese; English
• Published: 11.04.2023
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention discloses a preparation method of a linear alpha, omega-hydroxyl-terminated polydimethylsiloxane oligomer, which comprises the following steps: S1) preparing an aqueous solution mixture containing a polar water-soluble oxygen-containing organic compound; s2, dimethyldichlorosilane and the aqueous solution mixture obtained in the step S1 are mixed and hydrolyzed, a linear alpha, omega-hydroxyl-terminated polydimethylsiloxane oligomer is prepared, and the molar ratio of dimethyldichlorosilane to water is 1: (1-1.2); the molecular formula of the linear alpha, omega-hydroxyl-terminated polydimethylsiloxane oligomer is Cl-[(CH3) 2SiO-] nSi (CH3) 2Cl, and n is 2 or an integer which is at least 2. According to the method disclosed by the invention, the polydimethyl ring body can be produced without any catalytic cracking, waste acid does not need to be separated, and the linear low-molecular-weight hydroxyl-terminated polydimethylsiloxane oligomer can be selectively generated. 本发明公开了线性α,ω-端羟基聚二甲基硅氧烷齐聚物