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Method for preparing organic silicon high-temperature-resistant adhesive by removing micro-water from methylcyclosiloxane used as raw materials and device therefor

A technology of methyl ring body and high temperature glue, applied in the direction of organic decomposition, chemical instruments and methods, etc., can solve problems such as unsatisfactory dehydration effect and appearance of clear water.

Inactive Publication Date: 2005-09-07
JIANGSU HONGDA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heating method is to use hot water through the outer jacket of the kettle to raise the temperature, but the dehydration effect of this method is not very ideal. Generally, the residual trace moisture is above 100ppm, and even open water appears in serious cases, which cannot meet the production of high-quality methyl vinyl silicone rubber. polymer requirements

Method used

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  • Method for preparing organic silicon high-temperature-resistant adhesive by removing micro-water from methylcyclosiloxane used as raw materials and device therefor
  • Method for preparing organic silicon high-temperature-resistant adhesive by removing micro-water from methylcyclosiloxane used as raw materials and device therefor
  • Method for preparing organic silicon high-temperature-resistant adhesive by removing micro-water from methylcyclosiloxane used as raw materials and device therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 680kg of mixed methylcyclosiloxane and vinyl rings to a 1000L dehydration kettle after being metered by a metering tank. After bubbling with nitrogen, start the circulation pump to circulate, and open the coil steam valve of the dehydration kettle. , put in steam to heat, control the material temperature at 66°C, vacuum spray and dehydrate for 3 hours, test the water content in the ring body at 8ppm, add 4.5 / 10,000 alkali glue catalyst and 2.45 kg of vinyl head sealant, and carry out The molecular weight of raw rubber obtained by polymerization is 660,000, and the volatile content is 1.0%.

Embodiment 2

[0019] Add 560 kg of methylcyclosiloxane and vinyl ring to the 1000L dehydration kettle through the metering tank, blow nitrogen into it, start the circulating material pump, spray the material circularly, and open the disc of the dehydration kettle. Heat up the tube steam valve, control the temperature of the material at 68°C, vacuum spray and dehydrate for 3 hours, test the moisture content in the ring body at 7.5PPm, and then add 4.5 / 100,000 alkali glue and 2.1 kg of vinyl head sealant , to carry out polymerization to obtain raw rubber with a molecular weight of 670,000 and a volatile content of 1.1%.

Embodiment 3

[0021] Add 1080kg of methylcyclosiloxane and vinyl ring to a 1300L dehydration kettle after being metered by a metering tank, blow nitrogen into the tank, start the circulation pump for special circulation spraying, turn on the coil to raise the temperature of the steam, and control the material The temperature is 67°C, vacuum spray dehydration for 3 hours, the water content in the test ring is 9PPm, add 4.5 / 100,000 alkali glue and 6 kg of methyl capping agent, the molecular weight of the polymerized raw rubber is 650,000, volatilization Parts 1.0%.

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Abstract

The invention relates to a method for preparing organosilicon high-temperature glue, comprising ventilating nitrogen through the bottom pipe and steam through steam coil to increase temperature directly; dehydrating the mixing methyl in the stock, the favorable improvement of the dehydrating effect of this invention compared with previous technique is that after the dehydrating the micro-hydration in stock decreases dramatically, at an average of below 10ppm. The addition quantity of regent for head closure in the polymerization process preparing high-temperature glue gradually becomes stable, the molecular weight of raw rubber polymerization is relatively stable. The quantity of terminal hydroxyl group decreases dramatically in the high-temperature glue preparing process, the moulding is faster in the process, the storing time of the mixed glue and its physical-mechanical properties and processing property have been improved considerably.

Description

technical field [0001] The invention relates to a production method of silicone high-temperature glue, in particular to a method and a device for removing trace water from a methyl mixed ring body of raw material of silicone high-temperature glue. Background technique [0002] The application fields of methyl vinyl silicone rubber vulcanized products are expanding day by day, and the technical level of silicone rubber synthesis directly affects the physical and mechanical properties and use of silicone rubber vulcanized products. In the synthesis process of silicone rubber, the removal of trace water from the raw material methyl mixed ring body is one of the key processes. The dehydration effect directly affects the effect of polymerization. The trace amount of water contained in the raw material methyl mixed ring body, in During the synthesis process, it will be converted into a hydroxyl-terminated polymer. First, it will affect the molecular weight of the methyl vinyl sili...

Claims

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Application Information

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IPC IPC(8): C07B35/06C08G77/00
Inventor 祝纪才朱德洪陈江明徐连英
Owner JIANGSU HONGDA NEW MATERIAL
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