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Self-repaired polyalcohol composite material at room temperature

A composite material and polymer technology, applied in the field of self-healing polymer composite materials, can solve the problems of insoluble polydimethylsiloxane, easy deactivation, inability to phase separation, etc., and achieve good bonding repair effect, It is not easy to penetrate and volatilize, and it is beneficial to the effect of mutual diffusion

Inactive Publication Date: 2008-04-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that this method exists is: (a) the reactive monomer self instability that has double bond, all can self-polymerization reaction take place when storing too long or temperature is too high; (b) the physical property instability of monomer, vapor pressure High, easy to permeate and volatilize; (c) Highly active catalysts are unstable, easy to deactivate, and have poor environmental tolerance; (d) Lack of chemical interaction between the bonding component and the substrate that play a repair role
The problems of this method are: (a) the lack of chemical interaction between the bonding components and the matrix that play a repairing role, so the repairing effect is poor; (b) the selection range of the matrix is ​​limited, polydimethylsiloxane must not be dissolved, otherwise it cannot phase separation

Method used

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  • Self-repaired polyalcohol composite material at room temperature
  • Self-repaired polyalcohol composite material at room temperature
  • Self-repaired polyalcohol composite material at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of the capsule that contains liquid epoxy resin: 12.5g melamine and 27.1g formaldehyde generate prepolymer under 70~75 ℃, pH value 9~10 conditions, cool down to 60 ℃, add 0.5ml50% (weight ratio) hydrochloric acid Aqueous solution and 28g methanol were stirred for 0.5 hour, and the solution changed from cloudy to clear. Add 200ml of water and 60g of diglycidyl tetrahydrophthalate, use a homogenizer 8×10 3 Rotate per minute to disperse for 5 minutes, drop 2 drops of tributyl phosphate to eliminate the bubbles in the emulsion. Adjust the pH of the system to 2.5-3.0, and react at 50-55°C for 1 hour. After cooling, filter, wash and dry in vacuum. Yield: 93.24%. The average size is 15.47 μm. Capsule core content: 86.13%.

Embodiment 2

[0040] Containing the preparation of the capsule of liquid polythiol: 50g pentaerythritol tetrakis (mercapto propionate) joins in 200ml and contains 2% (accounting for total weight ratio) in styrene sodium maleate aqueous solution, mixture is with emulsifying machine with 10 4 Disperse for 5 minutes at a speed of rpm, and drop 2 drops of tributyl phosphate to eliminate the bubbles in the emulsion. Pour the prepolymer produced by 12.5g melamine and 27.1g formaldehyde at 70-75°C and pH 9-10 into the above emulsion, adjust the pH of the system to 2.7-3.0, and react at 50°C for 1 hour. After cooling, filter, wash and dry in vacuum. Yield: 90.23%; average capsule diameter: 14.35 μm; capsule core content: 84.92%.

Embodiment 3

[0042] Take by weighing 10% by weight of epoxy resin capsules prepared by Example 1 and 10% by weight of mercaptan capsules prepared by Example 2, and evenly disperse them in 100 parts of EPON 828 epoxy resins at 40~50°C, add 12.5 Parts of diethylenetriamine were quickly mixed and degassed, poured into a silicone rubber mold and cured for 24 hours, and then cured at 40°C for 24 hours.

[0043] A tapered double cantilever beam (TDCB) specimen was used to conduct a fracture test and evaluate the repair efficiency of the material: a pre-crack was generated by tapping a thin blade into the molded incision of the sample, and a load was applied perpendicular to the pre-crack direction with a pin load fixture. The initial fracture toughness was determined from the critical load for crack propagation and specimen failure. After damage, remove the load and allow the crack to heal at room temperature (20-25°C). Fracture toughness was re-measured after 24 and 48 hours to quantify repair...

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Abstract

The present invention relates to the technological field of self-repairing polymer material and discloses a self-repairing polymer composite material at the room temperature. The self-repairing polymer composite material is made of the following components of the following weight percentages: 40 percent to 98 percent of polymer matrix, 1 percent to 50 percent of capsule containing liquid epoxy resin, 1 percent to 50 percent of capsule containing liquid poly mercaptan and 0.1 percent to 15 percent of catalyst. The capsules containing the liquid epoxy resin and the poly mercaptan of the present invention can bear the external force of processing when the material is prepared. When the matrix material is damaged and cracked, the crack can be split together with the matrix while passing the capsules to release two reaction substances. The two reaction substances are polymerized rapidly so as to prevent the increase of the crack and to repair the crack. The self-repairing composite material of the present invention needs no heating while repairing; and the crack repair can be automatically finished at the room temperature.

Description

technical field [0001] The invention relates to a self-healing polymer composite material. Background technique [0002] Polymer materials have been widely used in construction, machinery, microelectronics and other industries. Due to mechanical fatigue, thermal fatigue, impact, radiation, chemical degradation, etc., polymer materials will inevitably produce local damage and microcracks, resulting in reduced performance. Therefore, the early detection and repair of microcracks in polymer materials is a very practical problem. Since the cracks of polymers often appear deep inside, it is difficult to detect and repair them by conventional means. If these damages cannot be repaired in time, it will seriously affect the normal use of materials and shorten the service life, resulting in accidents. Therefore, it is very important to study the bionic repair-self-healing of polymer materials, actively and automatically repair the damaged parts, and the application of polymer mater...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L67/06C08L61/06C08L75/04C08L77/00C08L33/00C08K9/00C08J7/00
Inventor 袁彦超章明秋容敏智
Owner SUN YAT SEN UNIV
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