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Preparation method of hydroxyl blocking polydimethylsiloxane

A dimethylsiloxane, hydroxyl sealing technology, applied in the chemical field, can solve problems such as low and low molecular content

Active Publication Date: 2013-04-24
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The low-viscosity hydroxyl-terminated polydimethylsiloxane is easy to remove low-molecular substances. In the present invention, the low-viscosity hydroxyl-terminated polydimethylsiloxane is firstly treated to remove low-molecular substances to make it reach 0.03 % volatile matter content index, and then the refined end-blocked polydimethylsiloxane is synthesized under the catalyzed reaction of potassium silanolate into a hydroxyl-blocked polydimethylsiloxane with a higher viscosity. End-capped polydimethylsiloxane has a lower content of low-molecular substances, which overcomes the high volatile content of existing preparation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of hydroxyl-terminated polydimethylsiloxane, the specific process steps are:

[0015] a. Refining process: the viscosity of 200 parts is 65mm 2 / s of hydroxyl-terminated polydimethylsiloxane removes low-molecular substances in a thin-film evaporator. The temperature for removing low-molecular substances is controlled at 160 ° C, the pressure is 1KPa, and 3 hours. After cooling down, decolorize and filter;

[0016] b. Condensation reaction: put the refined hydroxyl-terminated polydimethylsiloxane into the reaction kettle, add potassium siliconate, and the input amount of potassium siliconate is 10ppm of the refined hydroxyl-terminated polydimethylsiloxane , turn on the stirring, and pass in nitrogen, and blow out the water obtained from the condensation reaction; the reaction temperature is controlled at 90°C, and the parameters are set by the online viscometer. 2 / s, stop nitrogen, add 10ppm silicon alkoxide phosphate to neutralize for 2 hours.

Embodiment 2

[0018] A preparation method of hydroxyl-terminated polydimethylsiloxane, the specific process steps are:

[0019] a. Refining process: the viscosity of 200 parts is 30mm 2 / s of hydroxyl-terminated polydimethylsiloxane removes low-molecular substances in a thin-film evaporator. The temperature for removing low-molecular substances is controlled at 180°C, the pressure is 2KPa, and 5 hours. After cooling down, it is decolorized and filtered;

[0020] b. Condensation reaction: put the refined hydroxyl-terminated polydimethylsiloxane into the reaction kettle, add potassium siliconate, and the input amount of potassium siliconate is 5ppm of the refined hydroxyl-terminated polydimethylsiloxane , turn on the stirring, and pass in nitrogen, and blow out the water obtained from the condensation reaction; the reaction temperature is controlled at 100°C, and the parameters are set by the online viscometer. 2 / s, stop nitrogen, add 5ppm silicon alkoxide phosphate to neutralize for 2 hour...

Embodiment 3

[0022] A preparation method of hydroxyl-terminated polydimethylsiloxane, the specific process steps are:

[0023] a. Refining process: the viscosity of 200 parts is 100mm 2 / s of hydroxyl-terminated polydimethylsiloxane removes low-molecular substances in a thin-film evaporator, and the temperature for removing low-molecular substances is controlled at 150°C and the pressure is 1KPa for 3 hours. After cooling down, it is decolorized and filtered;

[0024] b. Condensation reaction: Put the refined hydroxyl-terminated polydimethylsiloxane into the reaction kettle, add potassium siliconate, and the input amount of potassium siliconate is 20ppm of the refined hydroxyl-terminated polydimethylsiloxane , turn on the stirring, and pass in nitrogen, and blow out the water obtained from the condensation reaction; the reaction temperature is controlled at 70°C, and the parameters are set by the online viscometer. 2 / s, stop nitrogen, add 20ppm silicon alkoxide phosphate to neutralize fo...

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Abstract

The invention discloses a preparation method of manufacturing hydroxyl blocking polydimethylsiloxane with low volatile content. Firstly, the hydroxyl blocking polydimethylsiloxane with low viscosity is refined to obtain intermediate products with the content of volatile less than 0.03%. Then, a condensation reaction is done. The water is removed through nitrogen to control the viscosity. Finally, the high viscosity hydroxyl blocking polydimethylsiloxane with the content of volatile less than 0.03% is obtained. The preparation method of manufacturing the hydroxyl blocking polydimethylsiloxane has the advantages that the preparation method and the technology are simple and non-pollution, volatile components of products are small, the quality is stable and good and the like.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing hydroxyl-terminated polydimethylsiloxane. Background technique [0002] Silicone rubber made of hydroxyl-terminated polydimethylsiloxane as the base material, has good adhesion, no primer for various substrates, excellent electrical insulation, excellent weather resistance, Ozone and chemical corrosion resistance, easy molding, etc., are widely used in the preparation of adhesives, potting materials, and sealants for electrical and electronic devices, which help to seal and protect extremely sensitive circuits, semiconductors, and equipment. Pollution, heat, and accidental damage ensure long-term stability and performance of electronic equipment. [0003] At present, the conventional preparation method of hydroxyl-terminated polydimethylsiloxane in the market is to use octamethylcyclotetrasiloxane, organosilicon mixed ring or organosilicon hydrolyzate as r...

Claims

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Application Information

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IPC IPC(8): C08G77/34C08G77/16C08G77/06
Inventor 廖桂根章淑娥黄素梅汪永红张伶俐
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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