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Method for preparing methyl silicone oil by utilizing sulfuric acid

A technology of methyl silicone oil and catalyst, applied in the field of preparation of methyl silicone oil, can solve the problems of long reaction time, complicated process, high cost, etc., and achieve the effects of high product quality, improved reaction efficiency, and positive color

Inactive Publication Date: 2014-07-23
DONGZHI OASIS ENVIRONMENTAL PROTECTION CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional preparation method uses dimethylcyclosiloxane as the main raw material and tetramethylaluminum hydroxide, potassium hydroxide, strong acid silicone resin, etc. as the catalyst. long, high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of method that utilizes sulfuric acid to prepare methyl silicone oil as catalyst, comprises following processing step,

[0019] 1) Add the dimethylcyclosiloxane mixture into the reaction kettle for stirring;

[0020] 2) Add industrial-grade sulfuric acid with a content of 98% as a catalyst into the reactor, control the temperature of the reactor at 65-70°C, and the amount of catalyst added accounts for 10% of the total mass percentage of the dimethylcyclosiloxane mixture;

[0021] 3) After 10 hours of equilibrium reaction, the reaction is complete, and the finished product of methyl silicone oil is obtained after refining.

[0022] The dimethylcyclosiloxane mixture is prepared by the following method:

[0023] 1) Raw material selection: one or a mixture of silicone rubber scraps, glass glue, buttons, pacifiers or silicone oil;

[0024] 2) Softening: Soften the selected raw materials by adding dimethylformamide;

[0025] 3) Catalyst configuration: select a mixt...

Embodiment 2

[0028] A kind of method that utilizes sulfuric acid to prepare methyl silicone oil as catalyst, comprises following processing step,

[0029] 1) Add the dimethylcyclosiloxane mixture into the reaction kettle for stirring;

[0030] 2) Add industrial-grade sulfuric acid with a content of 98% as a catalyst into the reactor, control the temperature of the reactor at 65-70°C, and add 15% of the total mass percentage of the dimethylcyclosiloxane mixture;

[0031] 3) After 10 hours of equilibrium reaction, the reaction is complete, and the finished product of methyl silicone oil is obtained after refining.

[0032] The dimethylcyclosiloxane mixture is prepared by the following method:

[0033] 1) Raw material selection: one or a mixture of silicone rubber scraps, glass glue, buttons, pacifiers or silicone oil;

[0034] 2) Softening: Soften the selected raw materials by adding dimethylformamide;

[0035] 3) Catalyst configuration: select a mixture of sulfuric acid and sulfonic acid...

Embodiment 3

[0038] A kind of method that utilizes sulfuric acid to prepare methyl silicone oil as catalyst, comprises following processing step,

[0039] 1) Add the dimethylcyclosiloxane mixture into the reaction kettle for stirring;

[0040] 2) Add sulfuric acid with a content of 98% as a catalyst into the reactor, control the temperature of the reactor at 65-70°C, and the amount of catalyst added accounts for 5% of the total mass percentage of the dimethylcyclosiloxane mixture;

[0041] 3) After 10 hours of equilibrium reaction, the reaction is complete, and the finished product of methyl silicone oil is obtained after refining.

[0042] The dimethylcyclosiloxane mixture is prepared by the following method:

[0043] 1) Raw material selection: one or a mixture of silicone rubber scraps, glass glue, buttons, pacifiers or silicone oil;

[0044] 2) Softening: Soften the selected raw materials by adding dimethylformamide;

[0045] 3) Catalyst configuration: choose a mixture of sulfuric ac...

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Abstract

The invention discloses a technology for preparing methyl silicone oil by performing acid-method inner depolymerization on organosilicon waste dimethylcyclosiloxane, and relates to the technical field of chemical engineering. The technology comprises: 1) adding dimethylcyclosiloxane into a reaction vessel and stirring; 2) taking industrial-grade sulfuric acid with the content of 98% as a catalyst, adding into the reaction vessel, and controlling the temperature of the reaction vessel to be 65-70 DEG C, wherein the adding amount of the catalyst is 5-15% by mass of the total mass of dimethylcyclosiloxane; and 3) balancing the reaction for 10 h to complete the reaction, and refining to obtain the finished product methyl silicone oil. According to the method, dimethylcyclosiloxane is taken as the main raw material, sulfuric acid is taken as the catalyst, so that a conventional catalytic reaction manner is changed, the reaction time is shortened, the reaction efficiency is improved, and the prepared product is high in quality, pure in color, economic and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing methyl silicone oil by using sulfuric acid as a catalyst. Background technique [0002] Methyl silicone oil is colorless, odorless, non-volatile; insoluble in water, methanol, ethylene glycol, miscible with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, has a small vapor pressure, high flash point and burn. Methyl silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertness and small surface tension, as well as low viscosity-temperature coefficient and high compression resistance. Methyl silicone oil is widely used in electronic appliances, building materials, motor manufacturing, transportation, petrochemical, textile, printing and dyeing, thread making, various polyester and polyester cotton, polyester rayon fabrics, post-finishing to improve the ...

Claims

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Application Information

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IPC IPC(8): C08G77/08C08J11/28C08J11/16
CPCY02W30/62
Inventor 陈建宇
Owner DONGZHI OASIS ENVIRONMENTAL PROTECTION CHEM
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