Silicone rubber pyrolysis recycling process

A technology for silicone rubber and silicone rubber waste, which is applied in the field of silicone rubber cracking, recycling and recycling processes, and can solve the problems of inadvisability from an economic point of view, serious corrosion of equipment by acid, and high energy consumption.

Inactive Publication Date: 2014-09-03
任炳陵
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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) For the crushing of silicone waste, the silicone rubber waste is first sorted into liquid, pasty glue and solid glue, and is carried out through a twin-screw extruder with four heating zones and a screw combination mode of reverse cam combination. Carry out pulverization, increase the modifier cumene peroxide during the pulverization process; reduce the temperature of the first preheating zone from 180°C to 150°C, and the next three heating zones from 120°C to 20°C, so as to obtain the particle size Silicone rubber particles less than or equal to 1mm;

[0022] (2) For the cracking of organic silicon waste, the crushed silicone rubber particles are put into the cracking reactor at a rate of 490kg per kettle, and 3% dodecylbenzenesulfonic acid and 1.5% concentrated sulfuric acid solution are added as catalysts. And react under vacuum conditions below 0.06MPa for 3 hours to obtain 5% crude DMC;

[0023] (3) Polymerization and rearrangement, adding crude DMC to the rea...

Embodiment 2

[0028] (1) For the crushing of silicone waste, the silicone rubber waste is first sorted into liquid, pasty glue and solid glue, and is carried out through a twin-screw extruder with four heating zones and a screw combination mode of reverse cam combination. Grinding, adding the modifier cumene peroxide during the pulverization process; reducing the temperature of the first preheating zone from 180°C to 150°C, and the next three heating zones from 120°C to 20°C to obtain the particle size Silicone rubber particles less than or equal to 1mm;

[0029] (2) For the cracking of organic silicon waste, put the crushed silicone rubber particles into the cracking reactor at a rate of 485kg per kettle, add 3.5% dodecylbenzenesulfonic acid and 2% concentrated sulfuric acid solution as catalysts, and heat at 200°C And react under vacuum conditions below 0.06MPa for 3 hours to obtain 5% crude DMC;

[0030] (3) Polymerization and rearrangement, adding crude DMC to the rearrangement reactor...

Embodiment 3

[0035] (1) For the crushing of silicone waste, the silicone rubber waste is first sorted into liquid, pasty glue and solid glue, and is carried out through a twin-screw extruder with four heating zones and a screw combination mode of reverse cam combination. Grinding, adding the modifier cumene peroxide during the pulverization process; reducing the temperature of the first preheating zone from 180°C to 150°C, and the next three heating zones from 120°C to 20°C to obtain the particle size Silicone rubber particles less than or equal to 1mm;

[0036] (2) For the cracking of organic silicon waste, the crushed silicone rubber particles are put into the cracking reactor at a rate of 495kg per kettle, and 2.5% dodecylbenzenesulfonic acid and 1% concentrated sulfuric acid solution are added as catalysts. And react under vacuum conditions below 0.08MPa for 3 hours to obtain 5% crude DMC;

[0037](3) Polymerization and rearrangement, adding crude DMC to the rearrangement reactor, the...

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PUM

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Abstract

The invention discloses a silicone rubber pyrolysis recycling process. According to the technical scheme disclosed by the invention, the process is characterized by comprising the following steps: smashing organic silicone wastes; carrying out pyrolysis, polymerization rearrangement as well as decoloration and odor removal on the organic silicone wastes; and processing a finished product so as to obtain a simethicone product. The process is relatively high in recycling efficiency and realizes reduction in environmental pollution.

Description

technical field [0001] The invention relates to a comprehensive utilization of waste materials of chemical raw materials, more specifically, it relates to a process for cracking, recovering and regenerating silicon rubber. Background technique [0002] In the prior art, people use the leftover waste of silicone rubber to produce and recycle the organosilicon ring body process by pyrolysis, produce a large amount of acid dust and ash, and its amount accounts for about 30%-60% of the leftover waste, and The main component of these ash residues is silicon dioxide, so far no one has recovered it for comprehensive utilization. These ash residues not only affect and pollute the production environment and the health of workers, but also affect the environmental pollution outside the factory. [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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08G77/08C08G77/04C08J11/28C08J11/16B29B17/04
CPCY02W30/52Y02W30/62
Inventor 任国义
Owner 任炳陵
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