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Method for recovering organosilicon micro-molecules and organosilicon cyclic compounds through cracking silicone rubber serial substances

A silicone rubber and organosilicon technology, applied in the field of comprehensive utilization of chemical products, can solve the problems of limited processing capacity, secondary pollution, and large acid consumption.

Active Publication Date: 2016-08-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ultrasonic method consumes high energy and has limited processing capacity.
[0007] (2) Polysiloxane can be depolymerized into DMC under high temperature and reduced pressure. The end-capping group has a great influence on the thermal degradation performance of polysiloxane, and the products obtained by depolymerization are also quite different.
At present, the acid cracking process is mainly used in China, which consumes a large amount of acid, and the waste acid is not easy to handle, causing secondary pollution and resulting in high cost of acid cracking
In terms of process, the acid will cause the waste rubber powder to be suspended, which will increase the difficulty of the process

Method used

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  • Method for recovering organosilicon micro-molecules and organosilicon cyclic compounds through cracking silicone rubber serial substances
  • Method for recovering organosilicon micro-molecules and organosilicon cyclic compounds through cracking silicone rubber serial substances

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specific Embodiment approach

[0039] The present invention will be further described below through specific examples, but not limited thereto.

[0040] The raw materials used in the examples are conventional commercially available raw materials or synthesized according to reference methods.

[0041] The molecular weights described in the examples are number average molecular weights. The parts described in the examples are all parts by weight.

Embodiment 1

[0043] Put 500 grams of raw silicone rubber with a molecular weight of 600,000 into a 1-liter reactor, then slowly add 5 grams of methyltrichlorosilane, start stirring and raise the temperature of the device to reflux (66°C), and keep the reflux reaction After 4 hours, the reflux reaction was stopped. Add 10 mL of ethanol to terminate the reaction. The product was washed successively with saturated sodium bicarbonate solution and saturated sodium chloride solution. The product was dried over anhydrous magnesium sulfate overnight. The magnesium sulfate solid was filtered off to obtain a cracked product (infrared and nuclear magnetic analysis showed that the product was a mixture of small organic silicon molecules and cyclic bodies). The viscosity of the cracked product was tested using a rotational viscometer, and the test result was 20.5. This data shows that there is no macromolecule, and the cracking efficiency of raw silicone rubber is 100%.

Embodiment 2

[0045] As described in Example 1, except that toluene was added as a solvent, and the reaction time was 3 hours. Then ethanol was added to terminate the reaction, and the product was washed with saturated sodium bicarbonate solution and saturated sodium chloride solution successively. After drying over anhydrous magnesium sulfate and filtering, toluene was removed from the cleavage product by distillation. The viscosity of the cracked product after removing toluene was tested by a rotational viscometer, and the test result was 18.5, indicating that no macromolecule existed.

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Abstract

The invention relates to a method for recovering organosilicon micro-molecules and organosilicon cyclic compounds through cracking silicone rubber serial substances. The method comprises the following steps: a chemical reaction of an organosilicon halogenation agent and a polysiloxane main chain in silicone rubber is carried out to break the polysiloxane main chain into polysiloxanes with silicon-chlorine bonds, and the polysiloxanes with silicon-chlorine bonds undergo a series of back-biting reactions and are degraded into an organosilicon micro-molecule and organosilicon cyclic compound mixture; and organosilicon micro-molecules and organosilicon cyclic compounds obtained after cracking undergo a rearrangement reaction to obtain highly pure D4 used for synthesizing various organosilicon polymers and materials as a basic raw material.

Description

technical field [0001] The invention relates to a method for cracking silicone rubber series substances to recover organic silicon small molecules and ring bodies, belonging to the field of comprehensive utilization of chemical products. Background technique [0002] Silicone rubber has excellent heat resistance, cold resistance, dielectric properties, ozone resistance and aging resistance, and is widely used in aerospace, electronics, light industry, chemical industry, textile, machinery, construction, agriculture, transportation, medical and health and other fields. Silicone rubber products are mainly divided into three categories: high temperature rubber, room temperature rubber and liquid silicone rubber, which are widely used in a wide range of fields. In 2013, the consumption of various types of silicone rubber in my country exceeded 500,000 tons. In 2014, the total production capacity of high temperature silicone rubber, room temperature silicone rubber and liquid s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/18C08J11/22
CPCC08J11/18C08J11/22C08J2383/04Y02W30/62
Inventor 冯圣玉卢海峰张悦窦润涛
Owner SHANDONG UNIV
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