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A silicon alkoxide-terminated silicone polyamine curing agent and self-healing epoxy resin prepared therefrom

A technology of epoxy resin and curing agent, which is applied in the field of epoxy resin, can solve the problems of limited use range, etc., and achieve the effect of low cost, wide source of raw materials, and simple repair method

Active Publication Date: 2019-06-25
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-healing materials obtained by using siloxane equilibrium rearrangement reported so far are all elastomer materials, which greatly limits their application range.

Method used

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  • A silicon alkoxide-terminated silicone polyamine curing agent and self-healing epoxy resin prepared therefrom
  • A silicon alkoxide-terminated silicone polyamine curing agent and self-healing epoxy resin prepared therefrom
  • A silicon alkoxide-terminated silicone polyamine curing agent and self-healing epoxy resin prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1, the synthesis of aminopolysiloxane

[0052] Add 540g of 3-aminopropylmethyldimethoxysilane and 144g of deionized water into a 1L three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser, and heat to 60°C for hydrolysis and condensation reaction. The reaction lasts for 12 hours. After the reaction was completed, vacuum distillation was carried out to remove methanol and water generated during the condensation process to obtain 375 g of a colorless and transparent aminopropylmethylpolysiloxane product with a number average molecular weight of 1200 and named as PAMS-1.

Embodiment 2

[0053] Embodiment 2, the synthesis of aminopolysiloxane

[0054] Add 620g of N-aminoethyl-3-aminopropylmethyldimethoxysilane and 144g of deionized water into a 2L three-necked flask equipped with mechanical stirring, a thermometer and a reflux condenser, and heat to 80°C for hydrolysis and condensation reaction , The reaction lasted 9h. After the reaction, carry out vacuum distillation to remove methanol and water produced in the condensation process to obtain 442g colorless and transparent N-aminoethyl-3-aminopropylmethylpolysiloxane product with a number-average molecular weight of 1458, named as PAMS-2.

Embodiment 3

[0055] Embodiment 3, the synthesis of aminopolysiloxane

[0056] Add 900g of diethylenetriaminopropylmethyldimethoxysilane and 144g of deionized water into a 2L three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser, heat to 90°C for hydrolysis and condensation reaction, and the reaction lasts for 4 hours . After the reaction was completed, vacuum distillation was carried out to remove methanol and water generated during the condensation process to obtain 746 g of a colorless and transparent diethylenetriaminopropylmethylpolysiloxane product with a number average molecular weight of 2251 and named as PAMS-3.

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Abstract

The invention belongs to the technical field of epoxy resin curing agent, and discloses a silanol salt-terminated organo-silicon polyamine curing agent and thermally reversible crosslinking epoxy resin produced therewith. The curing agent is represented as the structure formula (I), wherein polysiloxane terminated with silanol salt serves as a main chain, and a part of or the whole siloxane chainsegment contains an amido functional group. A is aliphatic amino group, R1 and R2 are alkyl group or aryl group, and X is alkali metal salt or ammonium salt; in the structure of the curing agent, theamino group can be subjected to a curing crosslinking reaction with the epoxy resin; and under catalysis with the silanol salt, the polysiloxane chain segment is subjected to a balanced rearrangementreaction, so that an epoxy resin cured material has self-repairing function.

Description

technical field [0001] The invention belongs to the technical field of epoxy resin, and in particular relates to a silicon alkoxide-terminated silicone polyamine curing agent and a self-repairing epoxy resin material prepared therefrom. Background technique [0002] Epoxy resin is a kind of thermosetting resin, which is widely used in various fields due to its excellent comprehensive performance, such as automobile industry, aerospace, electronics industry, etc. However, due to the high cross-linking density and brittleness of the cured epoxy resin, it is easy to generate microcracks inside the epoxy matrix when subjected to continuous load. The further development of microcracks will eventually lead to structural damage and failure of the material. It is of great significance to repair microcracks in time to prevent further development of microscopic damage in the early stage of microcracks, which is of great significance for improving the safety of materials and prolongin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/50C08G77/38C08G77/26
Inventor 杨欣吴霄于然赵晓娟张瑛黄伟
Owner INST OF CHEM CHINESE ACAD OF SCI
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