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Recovery method of silicone rubber

A recycling method and silicon rubber technology, applied in the direction of silicon organic compounds, etc., can solve problems such as high temperature, high cost, and severe corrosion of equipment by acid, and achieve the goals of increasing cracking rate and yield, lowering cracking temperature, and accelerating cracking speed Effect

Inactive Publication Date: 2014-03-12
杨晓林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal cracking product has higher purity, but requires high temperature, high energy consumption, and low yield, which is not desirable from an economic point of view
The acid-catalyzed cracking product is pure and the yield is high, but the acid is severely corrosive to the equipment and needs to be replaced regularly, resulting in high cost. At the same time, the acid will also cause environmental pollution
Low yield of base-catalyzed cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put 100 grams of cleaned, air-dried and pulverized silicone rubber into a reaction furnace, add 8 grams of potassium hydroxide and 40 grams of high-temperature resistant inert solvent, heat up to 160°C for cracking, and react for 12 hours. Stop the reaction and weigh. The machine product weight of organosiloxane mixed ring body (DMC) is 9.8 grams, and the weight of ash residue is 11.5 grams.

Embodiment 2

[0014] Put 100 grams of cleaned, air-dried and pulverized silicone rubber into a reaction furnace, add 15 grams of potassium hydroxide and 50 grams of high-temperature-resistant inert solvent, heat up to 200°C for cracking, and react for 8 hours. Stop the reaction and weigh. The machine product weight of organosiloxane mixed ring body (DMC) is 23.76 grams, and the ash residue weight is 30.24 grams.

Embodiment 3

[0016] Put 100 grams of cleaned, air-dried and pulverized silicone rubber into the reaction furnace, add 66 grams of methanol solution of potassium hydroxide with a mass fraction of 30% and 55 grams of high-temperature resistant inert solvent, heat up to 250 ° C for cracking, and react 6 hours. Stop the reaction and weigh. The crude product of organosiloxane mixed ring (DMC) weighs 31.68 grams, and the weight of ash residue is 40.32 grams.

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PUM

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Abstract

The invention relates to a recovery method of silicone rubber by alkali solvent cracking. In a high temperature resistant inert solvent medium, an alkaline compound is employed to carry on cracking on silicone rubber. The cracking products are subjected to separation and purification to obtain organic siloxane ring monomers and silica. The method does not generate new wastes, and is consistent with the requirements of circular economy.

Description

technical field [0001] The invention relates to a recovery method of alkali-catalyzed solvent cracking silicone rubber, which belongs to the field of resource utilization of chemical materials. Background technique [0002] Silicone rubber is widely used in aerospace, electronic and electrical industries due to its excellent performance. The demand for conductive silicone buttons in the electronics industry alone is increasing by more than 35% per year. In the production process of silicone rubber products, a lot of scraps will be generated, and a lot of discarded silicone rubber products will be generated in the process of use. The accumulation of these wastes will not only pollute the environment, but also waste resources. [0003] There are mainly two methods of recycling silicone rubber scraps and waste products: physical and chemical. The physical method is mainly to crush the waste silicone rubber and use it as a filler. This method is simple and easy to operate, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/21C08K3/36
Inventor 杨晓林
Owner 杨晓林
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