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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 organic decomposition, chemical instruments and methods, etc., can solve problems such as unsatisfactory dehydration effect and open water

Inactive Publication Date: 2006-08-23
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

[0018] 680 kilograms of mixed methyl cyclosiloxane and vinyl ring are added to a 1000L dehydration kettle after being measured by a metering tank, and nitrogen is bubbled through, the circulating pump is turned on, and the coil steam valve of the dehydration kettle is opened. , Steam heating, control the material temperature at 66℃, vacuum spray dehydration for 3 hours, test the moisture content in the ring body at 8ppm, add 4.5 / 10ths of alkali catalyst and 2.45kg vinyl heading agent, proceed The raw rubber has a molecular weight of 660,000 and a volatile content of 1.0%.

Embodiment 2

[0020] 560 kilograms of methyl cyclosiloxane and vinyl ring are added to a 1000L dehydration kettle through a metering tank, nitrogen is bubbled into it, the circulating feed pump is started, the materials are sprayed cyclically, and the pan of the dehydration kettle is opened. Pipe steam valve to heat up, control the material temperature at 68℃, vacuum spray dehydration for 3 hours, test the moisture content in the ring body at 7.5PPm, then add 4.5 / 100,000 alkali glue and 2.1kg vinyl heading agent , The polymerization was carried out to obtain a crude rubber with a molecular weight of 670,000 and a volatile content of 1.1%.

Embodiment 3

[0022] Add 1080 kg of methyl cyclosiloxane and vinyl ring body into a 1300L dehydration kettle after being measured by a metering tank, bubbling with nitrogen gas, start a special cycle spray of the circulating pump, open the coil for steam heating, and control the material The temperature is 67℃, the water content in the test ring is 9PPm, and the moisture content in the test ring is 9PPm. Adding 4.5 / 100,000 alkali rubber and 6 kg methyl capping agent, the polymerized raw rubber has a molecular weight of 650,000 and is volatile Servings 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 organosilicon high-temperature glue, in particular to a method and a device for removing trace water by mixing methyl ring bodies with raw materials of organosilicon 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 process of silicone rubber synthesis, the removal of trace water from the raw methyl mixed ring is one of the key processes. The dehydration effect directly affects the polymerization effect. The trace water contained in the raw methyl mixed ring is During the synthesis process, it will be converted into a hydroxyl-terminated polymer. First, it will affect the molecular weight of the methyl vinyl silicone rubber polymer and cause the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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