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Room-temperature self-repairing type thermoplastic polymer material and preparation method thereof

A thermoplastic polymer and self-repairing technology, which is applied in the field of room temperature self-repairing thermoplastic polymer materials and its preparation, can solve the problems of weak interfacial adhesion, lack of chemical interaction, low strength, etc., and achieve increased bonding capacity and high Repair efficiency and cost reduction effect

Inactive Publication Date: 2010-03-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in this technology: (a) The adhesive used for repair is a two-component type, including microcapsules filled with repair monomers and catalysts wrapped in paraffin or directly dispersed in the matrix. The quality of uniform dispersion in the medium directly affects the self-healing effect of the material, and also increases the difficulty of preparing the self-healing material; (b) the high-activity catalyst is unstable, easy to deactivate, and has poor environmental tolerance; (c) self-repairing There is a lack of chemical interaction between the bonding components and the matrix, the interface adhesion is weak, and the strength after repair is relatively low; (d) the matrix material of microcapsule repair is generally a thermosetting polymer, and the self-repair research on thermoplastic polymers is still quite lagging behind

Method used

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  • Room-temperature self-repairing type thermoplastic polymer material and preparation method thereof
  • Room-temperature self-repairing type thermoplastic polymer material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of microcapsules containing liquid vinyl monomer: 6.0g melamine, 10.0g 37% (weight ratio) formaldehyde solution and 20ml distilled water were added to a three-necked reaction flask, and reacted at 70-75°C and pH 8-9 for about After 30 minutes, a transparent melamine-formaldehyde prepolymer solution was obtained. After the product is naturally cooled, add 180g of 0.3% (by weight) styrene-maleic anhydride copolymer sodium salt solution, 1.0g of sodium dodecylbenzenesulfonate and 0.5g of polyvinyl alcohol, and add 30g of core material A after mixing. Glycidyl acrylate, emulsified at 25°C and 300rpm for 20-30 minutes, then slowly adjusted the pH value of the reaction system to about 4.0-4.5 with 10% (weight ratio) citric acid solution, at a heating rate of 0.5°C / min The temperature of the reaction system was raised to 50-60° C., and the reaction temperature was maintained for 1.5-2.5 hours. The reaction solution was cooled to room temperature, filtered, and the...

Embodiment 2

[0030] Add 24.0g of methyl methacrylate and 1.031g of tetrabutylammonium bromide into a three-necked flask with argon gas to fully dissolve them, then add 0.057g of cuprous bromide, 0.069g of N , N, N', N', N"-pentamethyldiethyltriamine and 0.078g ethyl 2-bromoisobutyrate, and stirred evenly, reacted at 25°C for 5 hours, weighed 1.3g The microcapsules loaded with glycidyl methacrylate prepared in Example 1 were uniformly dispersed in the above-mentioned polymethyl methacrylate prepolymer at room temperature, mixed and degassed, and then poured into a silica gel mold for curing at room temperature for 48 hours. All operations were carried out in an airtight isolation protective cover with argon gas.

[0031]Use the cantilever beam impact sample to conduct fracture test and evaluate the repair efficiency of the material: before the impact, the sample is placed in a constant temperature oven at 25°C for 2 hours, and then it is completely destroyed by the impact instrument, and th...

Embodiment 3

[0033] Add 24.0g of methyl methacrylate and 1.031g of tetrabutylammonium bromide into a three-necked flask with argon gas to fully dissolve them, then add 0.057g of cuprous bromide, 0.069g of N , N, N', N', N"-pentamethyldiethyltriamine and 0.078g ethyl 2-bromoisobutyrate, and stirred evenly, reacted at 25°C for 5 hours, weighed 2.7g The microcapsules loaded with glycidyl methacrylate prepared in Example 1 were uniformly dispersed in the above-mentioned polymethyl methacrylate prepolymer at room temperature, mixed and degassed, and then poured into a silica gel mold for curing at room temperature for 48 hours. All operations were carried out in an airtight isolation protective cover with argon gas.

[0034] The evaluation method is the same as in Example 2. The results are shown in Table 1.

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Abstract

The invention relates to the technical field of self-repairing materials and discloses a room-temperature self-repairing type thermoplastic polymer material and a preparation method thereof. The room-temperature self-repairing type thermoplastic polymer material comprises the following components, by weight percent: 72-92% of monomer used for preparing a thermoplastic resin substrate, 0.1-0.4% ofinitiator used for preparing the thermoplastic resin substrate, 2.5-8% of catalyst used for preparing the thermoplastic resin substrate and 4-20% of micro-capsule containing a vinyl monomer. When theroom-temperature self-repairing type thermoplastic polymer material generates a micro-crack due to the action of external force in the use process, the micro-capsule embedded in the substrate is broken, and a repairing agent is released and generates atom transferring free radical active polymerization with the substrate, thus rupture faces are stuck and connected together, the crack is prohibitedfrom being further expanded, and the self repairing of the material is realized. The self-repairing type thermoplastic polymer material prepared by the invention has the characteristics of simple preparation (single-component micro-capsule), automatic completion of crack repairing at room temperature (no need of heating) and the like.

Description

technical field [0001] The invention relates to a room temperature self-healing thermoplastic polymer material and its preparation technology. Background technique [0002] With the development of science and technology, polymer materials (including polymer-based composite materials) are widely used in the fields of aviation, transportation, civil engineering, machinery industry and sporting goods because of their excellent physical and chemical properties, easy processing, and low price. However, during use and under the influence of the surrounding environment, various types of damage will inevitably occur on the surface and interior of polymer materials. The macroscopic cracks visible to the naked eye can be repaired manually, but the microscopic damage inside the material is difficult to detect. If these micro-damages cannot be repaired in time, they will further develop into macro-cracks to break the material and cause major safety accidents. Therefore, from the perspe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/14C08F20/18C08F12/08C08F257/02C08F265/06C08F265/04C08L61/28C08L61/24C08L61/20C08L77/00C08L75/02C08J7/16
Inventor 汪海平章明秋容敏智
Owner SUN YAT SEN UNIV
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