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A low-temperature rapid self-healing elastomer and its preparation method and application

A self-healing and elastomer technology, applied in the field of low-temperature rapid self-healing elastomer and its preparation, can solve the problems of long healing time, low healing efficiency, and affecting healing efficiency, etc.

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At low temperature, the healing efficiency is affected due to the limited diffusion motion of molecular chains and the exchange rate of metals and ligands, so few literatures have studied the self-healing behavior of self-healing materials at low temperature.
Researchers have introduced three kinds of metal coordination with different strengths into the polysiloxane chain. The material can heal at low temperature, but there are problems of long healing time and low healing efficiency.

Method used

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  • A low-temperature rapid self-healing elastomer and its preparation method and application
  • A low-temperature rapid self-healing elastomer and its preparation method and application
  • A low-temperature rapid self-healing elastomer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Add 19.1g 3-aminopropylmethyldiethoxysilane (0.1mol), 5.4g deionized water (0.3mol), 0.24g of 1,3-bis(3-amino) to a round bottom flask Propyl)-1,1,3,3-Tetramethyldisiloxane. Magnetic stirring reaction at room temperature for 8 hours, then vacuum distillation at 100°C for 1 hour, and vacuum distillation at 120°C for 2 hours to remove water and ethanol to obtain a colorless and transparent liquid, which is all-sided aminopropyl polysiloxane.

[0055] (2) Add 100g octamethylcyclotetrasiloxane (D 4 ), 18.5g full side aminopropyl polysiloxane, 2.1g 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and catalyst tetramethylhydrogenation Ammonium 0.02g, due to D 4 It is immiscible with all-sided aminopropyl polysiloxane, and the raw materials in the flask are divided into two layers after being added. Start the reaction and raise the temperature to 75°C for 15 minutes, then raise the temperature to 90°C for 10 hours, and then react at 145°C for 1.2 hours to decompose ...

Embodiment 2

[0073] In addition to AlCl in step (3) 3 ·6H 2 The molar ratio of O to the amino groups in the side amino polysiloxane is 1:4, and the rest are the same as in Example 1, and the product is expressed as: PDMS-NH 2 -Al-4.

[0074] For PDMS-NH 2 -Al-4 for infrared characterization, PDMS-NH 2 The N-H bending vibration peak is at 1577cm -1 Office, PDMS-NH 2 -Al-4's N-H bending vibration peak absorption peak appears at 1604cm -1 , indicating that there is an interaction between the amino group and the aluminum ion in the product.

[0075] PDMS-NH 2 -The viscous flow transition temperature T of Al-4 nl It is 99.3°C, much higher than room temperature.

[0076] Tested PDMS-NH 2 -Al-4 has a self-healing efficiency of 98.4% after healing at 20°C for 60 min, and a self-healing efficiency of 94.9% after healing at -20°C for 60 min.

Embodiment 3

[0078] In addition to AlCl in step (3) 3 ·6H 2 The molar ratio of O to the amino groups in the side amino polysiloxane is 1:5, and all the other are the same as in Example 1, and the product is expressed as: PDMS-NH 2 -Al-5.

[0079] For PDMS-NH 2 -Al-5 for infrared characterization, PDMS-NH 2 The bending vibration peak of N-H is 1577cm -1 place, while PDMS-NH 2 -The N-H bending vibration absorption peak of Al-5 appears at 1606cm -1 , indicating that there is an interaction between the amino group and the aluminum ion in the product.

[0080] Rheological test, PDMS-NH 2 -The viscous flow transition temperature T of Al-4 nl It is 78.4°C, which is higher than room temperature.

[0081] Tested PDMS-NH 2 -Al-5 has a self-healing efficiency of 99.9% after healing at 20°C for 60 min, and a self-healing efficiency of 94.7% after healing at -20°C for 60 min.

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Abstract

The invention belongs to the field of material synthesis and discloses a low-temperature fast-self-healing elastomer and a preparation method and application thereof. The preparation method includes:using 3-aminopropyl methyl diethoxysilane, water, 1,3-bis(3-amino propyl)-1,1,3,3-tetramethyl disiloxane as the raw materials to perform reaction to obtain full side amino aminopropyl polysiloxane; using octamethyl cyclotetrasiloxane, the full side amino aminopropyl polysiloxane and the 1,3-bis(3-amino propyl)-1,1,3,3-tetramethyl disiloxane as the raw materials to perform reaction under the effectof a catalyst to obtain side aminopropyl polysiloxane, dissolving the side aminopropyl polysiloxane and aluminum salt into a good solvent, and mixing to perform reaction to obtain the low-temperaturefast-self-healing elastomer. The heating efficiency of the synthesized elastomer is 98% or above when the elastomer heals at 20 DEG C for 60 minutes, and the healing efficiency of the synthesized elastomer is 94% or above when the elastomer heals at minus 20 DEG C for 60 minutes.

Description

technical field [0001] The invention belongs to the field of material synthesis, and in particular relates to a low-temperature fast self-healing elastomer and its preparation method and application. Background technique [0002] Materials are inevitably damaged, traumatized and broken due to long-term exposure to chemical substances, external forces, light and heat during use. The generation of microcracks will not only reduce the basic performance of the material, but also seriously affect the service life of the material. Inspired by the ability of organisms in nature to heal injuries on their own, researchers have set out to design materials with self-healing properties. In the past decade or so, self-healing materials have been widely used in wearable electronics, energy storage materials, protective coatings, healthcare materials, etc. By embedding self-healing sites into synthetic materials, the service life of materials can be significantly extended, maintenance co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08G77/26C08G77/388C08L83/08
CPCC08G77/26C08G77/388C08J3/24C08J2383/08
Inventor 张安强黄秋萍雷雨风林雅铃
Owner SOUTH CHINA UNIV OF TECH
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