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Preparation method for potassium trimethylsilanolate

A technology of potassium trimethylsiliconate and hexamethyldichlorosilane is applied in the field of preparing potassium trimethylsiliconate, can solve the problems of affecting catalytic efficiency, low purity, methanol residue and the like, and achieves simple process, low cost, No methanol residue effect

Inactive Publication Date: 2016-02-17
上海楚青新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium trimethylsiliconate produced in the prior art is generally reacted by hexamethyldisilazane and potassium oxide in a pyridine-methanol system, and its product is a white powder with low purity and methanol residue, which affects catalytic efficiency

Method used

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Examples

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Effect test

Embodiment 1

[0013] Embodiment 1 A method for preparing potassium trimethylsiloxide, the method includes the following steps:

[0014] Put 109kg of hexamethyldichlorosilane into the stirred tank, and while stirring, pour in nitrogen at a flow rate of 1L / min for 0.5h, continue to stir and add 56kg of potassium hydroxide, reflux and separate water for 10h at 100℃, and place the material in the centrifugal spray In the drying box, centrifugal spray drying was performed at a rotation speed of 3000 rpm and a temperature of 100° C. for 5 hours to obtain a white crystal product with a purity of 99.99%.

Embodiment 2

[0015] Embodiment 2 A method for preparing potassium trimethylsiloxide, the method includes the following steps:

[0016] Put 436kg of hexamethyldichlorosilane into the stirred tank, and while stirring, let in nitrogen gas at a flow rate of 1L / min for 0.5h, continue to stir and add 56kg of potassium hydroxide, reflux and separate water for 10h at 103℃, then place the material in the centrifugal spray In the drying box, centrifugal spray drying was carried out at a speed of 2500 rpm and a temperature of 120° C. for 3 hours to obtain a white crystal product with a purity of 99.98%.

Embodiment 3

[0017] Embodiment 3 A method for preparing potassium trimethylsiloxide, the method includes the following steps:

[0018] Put 545kg of hexamethyldichlorosilane into the stirred tank, and while stirring, pour in nitrogen gas at a flow rate of 1L / min for 0.5h, continue to stir and add 56kg of potassium hydroxide, reflux and separate water for 12h at 103℃, then place the material in the centrifugal spray In the drying box, centrifugal spray drying was carried out at a speed of 3500 rpm and a temperature of 110° C. for 4 hours to obtain a white crystal product with a purity of 99.97%.

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Abstract

The invention discloses a preparation method for potassium trimethylsilanolate. The method comprises the following steps: adding hexamethyldichlorosilane into potassium hydroxide under stirring and carrying out reflux and water separation at 100 to 103 DEG C for 10 to 15 h; and subjecting a product of reflux and water separation to centrifugal spray drying at a rotating speed of 2500 to 3500 rpm and a temperature of 100 to 120 DEG C so as to obtain a potassium trimethylsilanolate crystal. The preparation method is simple and has low cost; and the prepared potassium trimethylsilanolate is a white crystal, has a purity of more than 99% and does not have methanol residual.

Description

Technical field [0001] The invention belongs to the technical field of chemical catalysts, and particularly relates to a method for preparing potassium trimethylsiloxide. Background technique [0002] Potassium trimethylsiloxide, CAS number is 10519-96-7, molecular formula is C 3 H 10 KOSi is a commonly used catalyst for the preparation of polysiloxane polymerization catalysis and ring-opening catalysis. The polymerization catalysis and ring-opening catalysis reaction carried out by this catalyst has no methanol, no polychlorinated biphenyls and polychlorinated phenols in the residue. It is widely used in polymerization catalysis and ring opening catalysis. Potassium trimethylsiloxide produced in the prior art is generally reacted by hexamethyldisilazane and potassium oxide in a pyridine-methanol system. The product is a white powder with low purity and residual methanol. The catalytic efficiency. Summary of the invention [0003] The purpose of the present invention is to provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/08
Inventor 张斌
Owner 上海楚青新材料科技有限公司
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