Preparation method of medium/high-viscosity alpha,omega-dihydroxypolydimethylsiloxane

A hydroxyl polydimethylsiloxane and viscosity technology, applied in the field of organic compound preparation, can solve problems such as complicated steps, and achieve the effects of short reaction time, high production efficiency and less ring content
CN102675644BActive Publication Date: 2013-12-04SHANDONG DONGYUE ORGANIC SILICON MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG DONGYUE ORGANIC SILICON MATERIAL
Publication Date
2013-12-04

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Abstract

The invention relates to a preparation method of medium / high-viscosity alpha,omega-dihydroxypolydimethylsiloxane, which comprises the following steps: heating low-viscosity dihydroxypolydimethylsiloxane to 160-250 DEG C under reduced pressure of -0.1 to -0.05MPa, stirring, and immediately cooling to finish the reaction when the product viscosity achieves the preset value, thereby obtaining the medium / high-viscosity alpha,omega-dihydroxypolydimethylsiloxane. The method provided by the invention does not use any catalyst or neutralizer in the reaction process, and does not need filtration, and the product yield is high; the invention has the advantages of short time and high production efficiency in the whole preparation process; the molecular weight distribution of the product is narrow; and the content of alkali metal ions in the product is very low.
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Description

technical field

[0001] The invention relates to a method for preparing medium-high viscosity α, ω-dihydroxy polydimethylsiloxane, which belongs to the technical field of organic compound preparation. Background technique

[0002] α,ω-Dihydroxypolydimethylsiloxane is a kind of silicone base polymer widely used, mainly used in silicone rubber structure control agent, fabric, paper, leather material softener, anti-adhesive treatment agent, in addition It can be applied to the grafting or modification of organosilicon compounds, and the medium to high viscosity products are the base polymers of condensation type room temperature vulcanizing silicone rubber.

[0003] Preparation method of low-viscosity dihydroxy polydimethylsiloxane Huang Wei (Synthesis of low-viscosity terminal hydroxyl silicone oil Huang Wei 2002 Eleventh China Organic Silicon Academic Exchange Conference Paper) and Qi Fan (hydroxyl silicone oil preparation technology Research Progress Qi Fan, Li Meijiang, et ...

Claims

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