Technology for preparing dimethylcyclosiloxane by performing acid-method inner depolymerization on organosilicon waste

A technology of dimethylcyclosiloxane and silicon waste, applied in the direction of silicon organic compounds, can solve the problems of complicated process, high resource consumption, and inability to use recycled materials, etc., and achieve the effect of high product quality 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

However, the traditional preparation method is relatively complicated, consumes a lot of resources, and cannot use recycled materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A process for preparing a dimethylcyclosiloxane mixture by internally decomposing organic silicon waste by an acid method, comprising the following process steps,

[0014] 1) Raw material selection: one or a mixture of silicone rubber scraps, glass glue, buttons, pacifiers or silicone oil;

[0015] 2) Softening: Soften the selected raw materials by adding dimethylformamide;

[0016] 3) Catalyst configuration: choose a mixture of sulfuric acid and sulfonic acid as the catalyst, and the addition of both accounts for 3% of the total weight of the raw materials;

[0017] 4) Reaction: Put the raw materials and catalyst into the reactor for reaction, and carry out the catalytic reaction at a temperature of 200°C. After the reaction is complete, after the gas is pumped under negative pressure, the crude dimethylcyclosiloxane can be obtained by cooling it into a liquid hybrid.

Embodiment 2

[0019] A process for preparing a dimethylcyclosiloxane mixture by internally decomposing organic silicon waste by an acid method, comprising the following process steps,

[0020] 1) Raw material selection: one or a mixture of silicone rubber scraps, glass glue, buttons, pacifiers or silicone oil;

[0021] 2) Softening: Soften the selected raw materials by adding dimethylformamide;

[0022] 3) Catalyst configuration: choose a mixture of sulfuric acid and sulfonic acid as the catalyst, and the addition of both accounts for 10% of the total weight of the raw materials;

[0023] 4) Reaction: Put the raw materials and catalyst into the reactor for reaction, and carry out the catalytic reaction at a temperature of 220°C. After the reaction is complete, after the gas is pumped under negative pressure, the crude dimethylcyclosiloxane can be obtained by cooling it into a liquid hybrid.

Embodiment 3

[0025] A process for preparing a dimethylcyclosiloxane mixture by internally decomposing organic silicon waste by an acid method, comprising the following process steps,

[0026] 1) Raw material selection: one or a mixture of silicone rubber scraps, glass glue, buttons, pacifiers or silicone oil;

[0027] 2) Softening: Soften the selected raw materials by adding dimethylformamide;

[0028] 3) Catalyst configuration: choose a mixture of sulfuric acid and sulfonic acid as the catalyst, and the addition of both accounts for 20% of the total weight of the raw materials;

[0029] 4) Reaction: Put the raw materials and catalyst into the reactor for reaction, and carry out the catalytic reaction at a temperature of 230 ° C. After the reaction is complete, after the gas is pumped under negative pressure, it is cooled to liquid to obtain crude dimethylcyclosiloxane hybrid.

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PUM

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Abstract

The invention discloses a technology for preparing dimethylcyclosiloxane by performing acid-method inner depolymerization on organosilicon waste and relates to the technical field of chemical engineering. The technology comprises: 1) selecting raw materials, specifically selecting one or a mixture of silicone rubber scraps, glass cement, buttons, nipples, silicone oil and the like; 2) softening, specifically performing softening processing on the selected raw materials by adding dimethyl formamide; 3) preparing a catalyst, specifically selecting a mixture of sulfuric acid and sulfonic acid as a catalyst, and controlling the adding amount of sulfuric acid and sulfonic acid to be 3-30% by weight of the raw materials; and 4) reacting, specifically pouring the raw materials and the catalyst into a reaction vessel to perform a catalytic reaction at a temperature of 200-250 DEG C, after the reaction is finished, performing negative-pressure gas exhausting, and cooling to obtain a liquid, so as to obtain crude dimethylcyclosiloxane. According to the technology, organosilicon waste is taken as a raw material, sulfuric acid and sulfonic acid are taken as the catalyst, so that waste is fully reacted, the product demands are satisfied, 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 process for preparing a dimethylcyclosiloxane mixture by internally decomposing organic silicon waste by an acid method. Background technique [0002] The primary form of dimethylcyclosiloxane is mainly used for ring-opening polymerization to form silicone oil, silicone rubber and silicone resin with different degrees of polymerization. These polymers are further processed into products that are widely used in various fields such as construction, electronics, textiles, automobiles, personal care, food, and mechanical processing, and there are also a small amount of direct applications. The primary form of dimethylcyclosiloxane is an organic-inorganic compound with dimethyldichlorosilane as the main raw material, which is synthesized by hydrolysis, with silicon-oxygen (Si-O) bonds as the main chain, and silicon atoms directly connected to organic groups. compound. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/21
Inventor 陈建宇
Owner DONGZHI OASIS ENVIRONMENTAL PROTECTION CHEM
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