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Multilayer microcapsule for self-repair polymer materials and its preparation method

A technology of polymer materials and microcapsules, which is applied in the field of multilayer microcapsules for self-healing polymer materials and its preparation, can solve the problems of not conforming to the conventional molding process of thermoplastic materials, and having little application value, so as to improve repair efficiency, Reduce difficulty and increase the effect of polymer chain action

Inactive Publication Date: 2013-08-21
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this strategy uses an active matrix, which is rarely used in industrial production, and the preparation of self-healing composites can only be done by casting, which does not conform to the conventional molding process of thermoplastic materials. Therefore, Little practical value

Method used

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  • Multilayer microcapsule for self-repair polymer materials and its preparation method
  • Multilayer microcapsule for self-repair polymer materials and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 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

[0044] S1. Measure newly prepared 40mL2% sodium dodecylbenzenesulfonate solution, 20mL2% 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 80g of formosan Butyl acrylate was homogenized at a speed of 3Kr / min for 5min with a homogenizer. Then the above emulsion was transferred into a 1000ml three-necked round bottom flask and placed in an oil bath at 35°C, and the mechanical stirring speed was adjusted to 300rpm. Add the prepolymer obtained by reacting 25g melamine, 50g formaldehyde solution, 50g distilled water, and two drops of triethanolamine at 70°C for 20 minutes to the above-mentioned emulsion under mechanical stirring, gradually raise the temperature to 60°C, react for 3 hours, cool, wash with water, and sieve , and naturally dried to obtain microcapsules ①;

[0045] S2. Take by weighing 5g microcapsules 1. in a small beaker, add 20ml of dichloromethane solution ...

Embodiment 3

[0050] 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 80g of glycidyl methacrylate was homogenized at a speed of 4Kr / min for 8min with a homogenizer. Then the above 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 350rpm. Add the prepolymer obtained by reacting 25g melamine, 50g formaldehyde solution, 50g distilled water, and two drops of triethanolamine at 70°C for 20 minutes to the above-mentioned emulsion under mechanical stirring, gradually raise the temperature to 65°C, react for 3 hours, cool, wash with water, and sieve , and naturally dried to obtain microcapsules ①;

[0051] S2. Take by weighing 5g microcapsules 1. in a small beaker, add 25ml of dichloromethane solution co...

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Abstract

The invention discloses a multilayer microcapsule for self-repair polymer materials and its preparation method. The microcapsule is composed of a capsule core and three layers of capsule wall, wherein the second layer capsule wall material includes an atom transfer radical living polymerization macromolecular initiator and a catalyst, and the capsule core can undergo a room temperature living radical polymerization reaction under initiation of the second layer of capsule wall. Compared with traditional microcapsules, the multilayer microcapsule used for self-repair polymer materials is not only a storage container for reaction substances, but is also a multifunctional intelligent microcapsule integrating monomer and initiator storage, external crack perception, and polymerization reaction stimulation. The multilayer microcapsule disclosed in the invention can be widely applied to preparation of polymer composite materials with a self-repair function, and has the advantages of wide application range of a polymer matrix, strong adaptability of a composite material preparation process, and improvement of the repair efficiency of the composite material. With excellent storage stability, the multilayer microcapsule can realize mass production.

Description

technical field [0001] The present invention relates to a self-healing microcapsule, and more particularly to a multilayer microcapsule for a self-healing polymer material and a preparation method thereof. Background technique [0002] Polymer materials and their composite materials will inevitably produce local damage and microcracks during their molding process and use (such as glass fiber / epoxy composite laminates used for printed circuit boards are prone to interlayer microcracks during perforation processing). cracks, etc.), and then lead to macroscopic cracks and damage, affecting the normal use of related products and shortening the service life. Often these micro-damages are difficult to find at the beginning, or even if they are found, they cannot be repaired in time due to product shape and other restrictions. Therefore, if the polymer material can be endowed with a self-healing function, the above problems can be solved, the safety of the product can be significan...

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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