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High-temperature-resistant polythioether sealant and sealing method

A polythioether and sealant technology, which is applied in the field of polymer material sealants, can solve problems affecting long-term aging resistance, cannot meet sealing requirements, and cannot meet long-term work, etc., to achieve large molecular size, good heat resistance and stability performance, improve the effect of heat resistance

Active Publication Date: 2021-01-12
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, US5912319 discloses a highly efficient method for synthesizing polythioethers, which uses divinyl compounds and dithiol compounds to form polymer materials by addition polymerization in the presence of free radicals. This method is very simple and produces The molecular chain is mainly composed of carbon-sulfur bonds (-CH2S-) and carbon-oxygen bonds (-CH2O-). The temperature resistance level has been improved to a certain extent. In the hot air environment, free radical oxidation reaction occurs, and the chain segment is broken and degraded, which affects the long-term aging resistance and cannot meet the sealing requirements of higher heat resistance and stability
CN 105143312A discloses a sulfone-containing polythioether rubber. Part of vinyl sulfone is added during the polymerization process, so that the molecular main chain contains a certain sulfone group, which can effectively modify the heat resistance of the sealant, and can Using a variety of functional groups for end-capping, but still unable to meet the long-term work at 180°C

Method used

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  • High-temperature-resistant polythioether sealant and sealing method
  • High-temperature-resistant polythioether sealant and sealing method
  • High-temperature-resistant polythioether sealant and sealing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 134g HSCH 2 CH 2 CH 2 CH 2 SH, 158g CH 2 =CHOCH 2 CH 2 OCH 2 CH 2 OCH=CH 2 Put it into a flask, stir evenly, then heat to 70°C, add 3g of azobisisoheptanonitrile, after reacting for 3 hours, add 17.8g (CH 2 =CHCH 2 ) 2 CH-O-CH 2 -(o-CB 10 h 10 C), adding 3 g of azobisisoheptanonitrile, and reacting for 5 hours to obtain viscous polythioether rubber 1 which is liquid at room temperature. Through the GPC test, the relative number average molecular weight is 5529, and through the thermal weight loss (TG) test, the 10% thermal weight loss temperature is: 330°C.

Embodiment 2

[0041] 155g HSCH 2 CH 2 CH 2 CH 2 CH 2 SH, 114g CH 2 =CHOCH 2 CH 2 OCH=CH 2 Put it into a flask, stir evenly, then heat to 70°C, add 3g of azobisisoheptanonitrile, after reacting for 3 hours, add 28.6g (CH 2 =CHCH 2 ) 2 CH-O-CH 2 -(o-CB 10 h 10 C), adding 3 g of azobisisoheptanonitrile, and reacting for 5 hours to obtain polythioether rubber 2 which is liquid at room temperature. Through the GPC test, the relative number average molecular weight is 5210, and through the thermal weight loss (TG) test, the 10% thermal weight loss temperature is: 335°C.

Embodiment 3

[0043] 180g HSCH 2 CH 2 CH 2 CH 2 CH 2 CH 2 SH, 158g CH 2 =CHOCH 2 CH 2 OCH 2 CH 2 OCH=CH 2 Put it into a flask, stir evenly, add 2g of photoinitiator α,α-dimethoxy-α-phenylacetophenone, irradiate under ultraviolet light for 30min, add 40.5g (CH 2 =CHCH 2 ) 2 CH-O-CH 2 -(p-CB 10 h 10 C), add 2g photoinitiator α, α-dimethoxy-α-phenylacetophenone, irradiate 30min under the ultraviolet light, obtain the viscous shape polythioether rubber 3 that is liquid at room temperature, pass GPC In the test, the relative number average molecular weight is 5100, and the 10% thermal weight loss temperature is 340° C. through the thermal weight loss (TG) test.

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Abstract

The invention belongs to the technical field of high polymer material sealants, and relates to a high-temperature-resistant polythioether sealant and a sealing method. The liquid polythioether rubberis generated by reaction of diolefin and a disulfhydryl compound under the condition of free radical initiation, the main chain of the generated polythioether contains a certain amount of carborane structure, the oil resistance and the high temperature resistance are better, the polythioether rubber is used as raw rubber to be matched with filler such as silicon dioxide, alkyne carborane is used as a vulcanizing agent to be prepared into a sealant, and the sealing performance is good. The sealant has good elasticity, oil resistance and high temperature resistance after ultraviolet irradiationvulcanization, and can be used for sealing aircraft fuel tanks.

Description

technical field [0001] The invention belongs to the technical field of polymer material sealants, and relates to the synthesis of a high-temperature-resistant liquid polythioether rubber and a method for preparing a sealant as a raw material, in particular to a high-temperature-resistant polythioether sealant and a sealant method. Background technique [0002] Liquid polysulfide rubber is a polymer material with excellent performance. It contains a large amount of O and S elements in its molecular chain. Due to its high molecular polarity, it has good oil resistance. It can be prepared as a sealant by using manganese dioxide as a vulcanizing agent. , used in aviation, airport runways, automobiles and other fields. Since the polysulfide rubber molecular chain contains a large number of disulfide bonds (-SS-) and acetal bonds (-OCH2O-), its heat resistance is poor, and the long-term heat resistance is generally about 120 ° C. After the temperature rises, the molecular chain w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F238/00C08K13/06C08K9/06C08K7/24C08G75/045
CPCC08F283/00C08G75/045C08K13/06C08K9/06C08K7/24C08F238/00
Inventor 章谏正鲍传磊刘艺帆孙超吴松华
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS