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Preparation method of high-viscosity silicone oil

A high-viscosity and viscosity technology used in the preparation of high-viscosity silicone oil

Inactive Publication Date: 2014-11-12
何少云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The materials used in the production of silicone oil all the time, if it is made of cracking material: dimethylsiloxane mixture (DMC), there will be a disadvantage: it will follow The prolongation of time and the increase of temperature will cause back-viscosity and long-viscosity, that is, the viscosity will gradually increase, especially in the south in summer when the temperature is high, and it is more likely to have irregular changes in viscosity, resulting in production The viscosity required by the customer is produced, but if the manufacturer does not use it for production in a short period of time, the viscosity will gradually increase with the increase of storage time, exceeding the standard required for production, thereby affecting the production quality, giving suppliers and Customers cause serious economic losses
This is mainly the raw material used for production. If it is a silicone oil processed from a mixture of dimethyl siloxane produced from industrial electronic rubber scraps, the quality varies greatly, making it difficult to accurately control the viscosity.
When this kind of DMC is used in the production of low-viscosity silicone oil, even if it is back-viscous and long-term viscosity, it will have little effect on the quality, but it will have a great impact on the production of high-viscosity silicone oil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 1000 kg of dimethylsiloxane mixture (DMC), 2 kg of capping agent (simethicone oil with a viscosity of 5cs) and catalyst: 100 g of potassium hydroxide into the reactor respectively, and start the reactor agitator , to slowly heat up the reactor, heated to 70 degrees, and then vacuum dehydration. When the temperature of the reactor reaches 100 degrees, the vacuum dehydration is stopped and the telomerization reaction is carried out. Maintain the reaction temperature, take the first intermediate sample to test the intermediate viscosity and ring-opening rate, and the ring-opening rate should reach more than 85%. -0.095Mpa, remove until there are no shape drops, take the second intermediate sample to test the final viscosity, and analyze to meet the customer's order requirements; after the low molecular weight removal operation is completed, stop heating the reactor and lower the reactor to the packaging temperature, the finished product is obtained after packaging.

Embodiment 2

[0020] Put 2000 kg of dimethylsiloxane mixture (DMC), 4 kg of capping agent (simethicone oil with a viscosity of 5cs) and catalyst: 200 g of potassium hydroxide into the reaction kettle respectively, and start the reaction kettle agitator , slowly warming up the reactor, heated to 90 degrees, and then vacuum dehydration. When the temperature of the reactor reaches 140 degrees, the vacuum dehydration is stopped and the telomerization reaction is carried out. Maintain the reaction temperature, take the first intermediate sample to test the intermediate viscosity and ring-opening rate, the ring-opening rate is required to reach more than 85%, and the temperature is controlled at 220°C. After the polymerization reaction is completed, start the vacuum pump to carry out the lowering operation. Remove low molecular weight, vacuum degree ≤ -0.095Mpa, remove until there are no shape droplets, take the second intermediate sample to test the final viscosity, and analyze until it meet...

Embodiment 3

[0022] Put 1500 kg of dimethylsiloxane mixture (DMC), 3 kg of head sealant (simethicone oil with a viscosity of 5cs) and catalyst: 150 g of potassium hydroxide into the reactor respectively, and start the reactor agitator , to slowly heat up the reactor, heated to 80 degrees, and then carry out vacuum dehydration. When the temperature of the reactor reaches 110 degrees, the vacuum dehydration is stopped and the telomerization reaction is carried out. Maintain the reaction temperature, take the first intermediate sample to test the intermediate viscosity and ring-opening rate, and the ring-opening rate should reach more than 85%, and control the temperature at 200°C. After the polymerization reaction is over, start the vacuum pump to carry out the lowering operation. Remove low molecular weight, vacuum degree ≤ -0.095Mpa, remove until there are no shape droplets, take the second intermediate sample to test the final viscosity, and analyze until it meets the requirements of the ...

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PUM

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Abstract

The invention discloses a preparation method of high-viscosity hydroxyl-terminated room-temperature vulcanized silicone rubber. The preparation method is characterized by comprising the following steps: A, respectively throwing a dimethyl siloxane mixture, a sealing agent and a potassium hydroxide catalyst into a reaction kettle, stirring, heating to 70-90 DEG C, and then performing vacuum dehydration; B, when the temperature of the reaction kettle reaches 100-140 DEG C, stopping vacuum dehydration, and performing telomeric reaction; C, sampling and detecting, requiring that the ring opening rate reaches more than 85%, and starting a vacuum pump to perform low-component removal operation after polymerization reaction ends; D, after the low-component removal operation is completed, stopping heating, cooling, and packaging to obtain a finished product; or, transferring a material in the reaction kettle to a finished product storage tank for later packaging. By adopting the method, the preparation method disclosed by the invention can be used for preparing high-viscosity silicone oil; the preparation method is simple in process and stable in viscosity, and can not cause a long-sticking phenomenon; the product yield can be increased by 3-5% compared with the existing technical conditions; moreover, the preparation method is easy to control the reaction temperature required for different viscosity, is simple to operate, can be used for saving 8-12% of the cost compared with the same industry, and can meet the requirements of production and markets.

Description

technical field [0001] The invention relates to a method for preparing silicone oil, in particular to a method for preparing high-viscosity silicone oil. Background technique [0002] Silicone oil has a wide range of uses, especially high-viscosity silicone oil. General high-viscosity silicone oil is also called 201 methyl silicone oil, and its viscosity range is: 2000-100000 mm 2 / s (common type), 100000 mm 2 / s or above (produced according to customer needs), flash point: ≥300°C, it is a fully methylated high-molecular-weight linear siloxane polymer, and is a highly viscous semi-solid. High-viscosity silicone oil has high molecular weight, anti-stick and smooth, waterproof and hydrophobic, lower surface tension, good oxidation stability and weather resistance, high temperature resistance, compression resistance, good lubricity, good insulation, colorless, odorless, It is widely used in polishing agents for automobiles, furniture, floors, and leather; it can be made into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/06C08G77/34
Inventor 何少云王贤成兰建国
Owner 何少云