Multi-layer microcapsule for room-temperature self repairing, and preparation method and application thereof

A microcapsule and self-repair technology, which is applied in the direction of microcapsule preparation, microsphere preparation, etc., can solve the problems of thermoplastic polymers that cannot be satisfied, and achieve the effects of avoiding low effective utilization rate, easy preparation, and improving repair efficiency

Inactive Publication Date: 2013-08-14
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the thermoplastic self-healing material has achieved high repair efficiency (see CN102153715A, CN101659719A), it is limited in practical application because the thermoplastic active polymer has not yet been industrialized, and the preparation method of this self-healing composite material is Casting molding cannot meet the needs of conventional thermal processing molding processes for thermoplastic polymer materials

Method used

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  • Multi-layer microcapsule for room-temperature self repairing, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0047] The preparation of the active macromolecular initiator in the second layer of the capsule wall of the multilayer microcapsule of the present invention: in a glove box full of nitrogen, add the catalyst cuprous bromide / N, N, N', N' in sequence in the reaction bottle , N''-pentamethyldiethylenetriamine complex, phase transfer catalyst tetrabutylammonium bromide and newly refined methyl methacrylate monomer, after using magnetic stirring to completely dissolve the reactants into a uniform solution , adding the initiator 2-bromoisobutyrate ethyl ester, the molar ratio of the reaction raw materials is: methyl methacrylate / 2-bromoisobutyrate ethyl ester / cuprous bromide / N,N,N',N' , N''-pentamethyldiethylenetriamine / tetrabutylammonium bromide=200:1:1:1:8. Carry out polymerization reaction at room temperature, the time is 4h, then polymer product is dissolved, crosses neutral alumina chromatographic column, reprecipitates, obtains the macromolecular initiator active polymeth...

Embodiment 2

[0050] Preparation of multilayer microcapsules for self-healing:

[0051] S1. Measure newly prepared 40mL 2% sodium dodecylbenzenesulfonate solution, 20mL 2% polyvinyl alcohol aqueous solution, and 280mL distilled water in a 1000mL beaker, add 15mL10% acetic acid solution to adjust the pH to about 3.0, pour Add 80g of glycidyl methacrylate, and use a homogenizer to homogenize at 4.5Kr / min for 8min. Then the above-mentioned emulsion was transferred into a 1000ml three-neck round bottom flask and placed in an oil bath at 35°C, and the mechanical stirring speed was adjusted to 400rpm. React 25g of melamine, 50g of formaldehyde solution, 50g of distilled water, and two drops of triethanolamine at 70°C for 20 minutes, add the obtained prepolymer into the above-mentioned emulsion under mechanical stirring, gradually raise the temperature to 60°C, react for 3 hours, cool, wash with water, and pass Sieve, dry naturally to obtain microcapsules ①;

[0052] S2. Take by weig...

Embodiment 3

[0057] Preparation of multilayer microcapsules for self-healing:

[0058] S1. Measure newly prepared 40mL 2% sodium dodecylbenzenesulfonate solution, 20mL 2% polyvinyl alcohol aqueous solution, and 280mL distilled water in a 1000mL beaker, add 15mL10% acetic acid solution to adjust the pH to about 3.0, pour Add 80g of adamantyl methacrylate, and use a homogenizer to homogenize at 4.5Kr / min for 8min. Then the above-mentioned emulsion was transferred into a 1000ml three-neck round bottom flask and placed in an oil bath at 35°C, and the mechanical stirring speed was adjusted to 400rpm. React 25g of melamine, 50g of formaldehyde solution, 50g of distilled water, and two drops of triethanolamine at 70°C for 20 minutes, add the obtained prepolymer into the above-mentioned emulsion under mechanical stirring, gradually raise the temperature to 60°C, react for 3 hours, cool, wash with water, and pass Sieve, dry naturally to obtain microcapsules ①;

[0059] S2. Take 5g mic...

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Abstract

The invention discloses a room-temperature self repairing type thermoplastic polymer material based on a multi-layer microcapsule and a preparation method thereof. The thermoplastic polymer material comprises the following components in parts by weight: 70-95 parts of thermoplastic polymer base and 5-30 parts of filled multi-layer microcapsule for self repairing. The multi-layer microcapsule in the self repairing polymer material is a multifunctional intelligent multi-layer microcapsule combining a repairing agent and a catalyst. When a crack is generated in the base, the crack causes the capsule wall of the multi-layer microcapsule to crack together with the base, the liquid repairing agent at the capsule core part is released to be in contact with the catalyst on the middle capsule wall so as to initiate polymerization reaction at room temperature, and a generated new polymer bonds the cracked surfaces, thus preventing the propagation of the crack and repairing the crack. The multi-layer microcapsule used by the invention has moderate mechanical strength and favorable heat stability, and can endure the common thermal forming and processing technology of the thermoplastic material.

Description

technical field [0001] The present invention specifically relates to self-healing microcapsules, and more specifically, to a multilayer microcapsule for self-healing at room temperature and its preparation method and application. Background technique [0002] Self-healing technology is an important means to prolong the service life of polymer materials and ensure the stability of materials. In order to endow polymeric materials with the ability of self-healing, various methods have been developed. According to the different repair mechanisms, it is mainly divided into two categories, namely intrinsic self-healing and self-healing with external repairing agents. The former mainly uses the thermal reversibility or photoreversibility of the polymer molecule itself to repair the cracks inside or on the surface of the material without adding a repair agent, but this repair method requires the material molecule itself to have a self-healing mechanism, so it can only be applied to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F4/02B01J13/18B01J13/22
Inventor 朱东雨容敏智章明秋
Owner SUN YAT SEN UNIV
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