Preparation method of polysiloxane with low ring content

• Main Authors: YAO LEI, QU JIANXING, ZHANG FEI, SHA HAIDONG
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2024
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention relates to the technical field of organosilicon polymers, and discloses a low-ring-content polysiloxane preparation method, which comprises: taking a linear initiator as a raw material, taking a homologous conjugated acid as a catalyst, and mixing the two raw materials according to a ratio to generate polysiloxane with a ring content of less than 300 ppm; wherein alpha, omega-hydroxyl-terminated linear polysiloxane is adopted as the linear initiator; the homologous conjugate acid is prepared by conjugating Lewis acid and organic alkali; the molar ratio of the lewis acid to the organic base is (0.5-3): 1, the homologous conjugate lewis acid is adopted as a linear condensation polymerization catalyst, so that the'reverse biting 'cyclization phenomenon in the polymerization process is greatly restrained, the homologous conjugate acid is adopted as the catalyst, and under the condition that the reaction temperature and the reaction time are well controlled, the reaction yield is greatly improved. An