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High-mechanical-strength self-repairing self-adhesive polysiloxane elastomer and preparation method thereof

A technology of polysiloxane and mechanical strength, applied in the field of high mechanical strength self-healing and self-adhesive polysiloxane elastomer and its preparation, can solve the problems of unreported, poor mechanical properties, limited application fields, etc. problems, to achieve the effect of easy-to-obtain raw materials, low cost, and broad application prospects

Active Publication Date: 2022-06-28
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material has a simple process, easy-to-obtain raw materials, and can achieve self-healing at room temperature, but its mechanical properties are poor. The highest tensile strength can only reach 680KPa, and the longest elongation at break can only reach 1194%. Its application fields are limited.
According to literature research, there is no report on the preparation of elastomeric polysiloxanes with room temperature self-healing properties and self-adhesive properties by introducing a variety of dynamic bonds.

Method used

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  • High-mechanical-strength self-repairing self-adhesive polysiloxane elastomer and preparation method thereof
  • High-mechanical-strength self-repairing self-adhesive polysiloxane elastomer and preparation method thereof
  • High-mechanical-strength self-repairing self-adhesive polysiloxane elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1) Take 10g of side methylaminopropyl vinyl polysiloxane (Mn=50000g mol -1 , the molar ratio of methyl, aminopropyl and vinyl in the side methylaminopropyl vinyl polysiloxane is 8:1:1, that is, c:a:b=8:1:1), which is fully dissolved in After adding 0.2g of 2,2-dimethylolpropionic acid and 1.152g of mercaptoacetic acid to 20ml of tetrahydrofuran, stir until uniform, and then place it under a UV lamp to stir and irradiate for 15min to take out;

[0060] 2) Add 3.5 g of dithiodibenzoic acid to the prepared polymer, mix it evenly, place it at 60°C for stirring and react for 3 hours, and take it out;

[0061] 3) Finally, add 6.22ml of 0.1g / ml anhydrous zinc chloride solution to the polymer, stir evenly for 12h and wait for it to fully react, then pour it into the mold and place it in a fume hood to level at room temperature, and move it to 90°C after the tetrahydrofuran is volatilized. After drying in a vacuum oven for 12 hours, the mold is released to obtain a high-mechani...

Embodiment 2

[0063] 1) Take 10g of side methylaminopropyl vinyl polysiloxane (Mn=30000g mol -1 , the molar ratio of methyl, aminopropyl and vinyl in the side methylaminopropyl vinyl polysiloxane is 14:3:3, that is, c:a:b=14:3:3), which is fully dissolved in After adding 0.3g of 2,2-dimethylolpropionic acid and 0.23g of mercaptoacetic acid to 20ml of tetrahydrofuran, stir until uniform, and then place it under a UV lamp to stir and irradiate for 30min to take out;

[0064] 2) Add 1.76 g of dithiodibenzoic acid to the prepared polymer, mix it evenly, place it at 60° C. for stirring and react for 3 hours, and take it out;

[0065] 3) Finally, add 8.34ml of 0.1g / ml anhydrous ferric chloride solution to the polymer, stir evenly for 10h and wait for it to fully react, then pour it into the mold and place it in a fume hood to level at room temperature. After the tetrahydrofuran is volatilized, move it to 120°C After drying in a vacuum oven for 12 hours, the mold was released to obtain an elastom...

Embodiment 3

[0067] 1) Take 10g of side methylaminopropyl vinyl polysiloxane (Mn=35000g mol -1 , the molar ratio of methyl, aminopropyl and vinyl in the side methylaminopropyl vinyl polysiloxane is 6:2:2, that is, c:a:b=6:2:2), which is fully dissolved in After adding 0.2g of 2,4,6-trimethylbenzoyl-diphenylphosphorus oxide and 0.46g of mercaptoacetic acid to 20ml of tetrahydrofuran, stir until uniform, and then place it under a UV lamp to stir and irradiate for 20min to take out;

[0068] 2) Add 2.3 g of dithiodibenzoic acid to the prepared polymer, mix it evenly, place it at 65°C and stir for 3 hours and take it out;

[0069] 3) Finally, add 3.11 ml of 0.2 g / ml anhydrous zinc chloride solution to the polymer, stir evenly for 12 hours and wait for it to fully react, then pour it into the mold and place it in a fume hood to level at room temperature, and move it to 100 ° C after the tetrahydrofuran is volatilized After drying in a vacuum oven for 10 hours, the mold was released to obtain a...

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Abstract

The invention discloses a self-repairing and self-bonding polysiloxane elastomer with high mechanical strength and a preparation method thereof. The preparation method comprises the following steps: reacting side chain amino and vinyl of side methyl aminopropyl vinyl polysiloxane, sulfydryl of mercaptoacetic acid and carboxyl of dithiobenzoic acid molecules to form a high-crosslinking network polymer with weak hydrogen bonds and dynamic disulfide bonds, and adding metal ions into the polymer, so as to obtain the high-crosslinking network polymer with weak hydrogen bonds and dynamic disulfide bonds. And a plurality of coordination bonds are formed by the carboxyl, weak hydrogen bonds and other bonds in the high-crosslinking network polymer. In the network, a side vinyl group on side methyl aminopropyl vinyl polysiloxane is modified into a more active carboxyl group which forms a strong coordination effect with metal ions, and a side amino group on polysiloxane reacts with dithiobenzoic acid molecules so as to introduce a dynamic disulfide bond into a polysiloxane system. The material has good room-temperature self-repairing performance, high elongation at break, high tensile strength and excellent self-adhesion performance.

Description

technical field [0001] The invention relates to the field of polymer materials, to the field of polysiloxane elastomers with high mechanical strength, self-healing and adhesion to the surfaces of different materials, and more specifically to a self-healing and self-adhesive high mechanical strength Attached polysiloxane elastomers and methods of making the same. Background technique [0002] Due to the excellent properties of elastomer polysiloxane, such as weather resistance, good acid and alkali resistance, wide applicable temperature range, non-toxic and tasteless, it has been widely used in aerospace, national defense and military industry, mechanical construction, electronic equipment and other new scientific and technological fields. Widely used, it is one of the most important materials in the global special synthetic polymer materials. However, in practical applications, because the elastomeric polysiloxane needs to be stretched, compressed or sheared by mechanical ...

Claims

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Application Information

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IPC IPC(8): C08G77/398C08G77/392
CPCC08G77/398C08G77/392
Inventor 汤龙程李玉童张国栋胡婉君赵丽龚丽秀
Owner HANGZHOU NORMAL UNIVERSITY
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