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Shape memory epoxy resin and preparation method thereof

An epoxy resin and aliphatic epoxy resin technology, applied in the field of shape memory epoxy resin and its preparation, can solve the problems of insufficient toughness of the resin matrix, damage of the resin material, etc., so as to improve the exercise ability, consume energy, and avoid brittle fracture. Effect

Active Publication Date: 2015-07-01
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above problems, the main purpose of the present invention is to provide a shape-memory epoxy resin that has a higher service temperature and higher toughness and is not easy to crack in the process of large deformation, which can solve the problem of conventional shape-memory epoxy resins. The problem that the resin material itself is destroyed due to insufficient toughness of the resin matrix during the secondary shaping process of the material

Method used

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  • Shape memory epoxy resin and preparation method thereof
  • Shape memory epoxy resin and preparation method thereof

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preparation example Construction

[0048]

[0049] The preparation method of shape memory epoxy resin of the present invention comprises the steps:

[0050] (1). Epoxy resin and hyperbranched polyester are mixed in proportion and constantly stirred until hyperbranched polyester is completely dissolved in epoxy resin;

[0051] (2). Add curing agent in proportion and continue to stir until the mixture is evenly mixed to obtain a mixture;

[0052] (3). Inject the mixture obtained in step (2) into the mold, cure at 50°C-170°C for 1h-6h, and then continue to post-cure at 80°C-200°C for 0h-6h;

[0053] (4). Cool to room temperature and demold to obtain the shape memory epoxy resin of the present invention.

[0054] Wherein, the ratio by weight of epoxy resin, curing agent and hyperbranched polyester is 100: (8-80): (3-20), most preferably 100: 50: 5.

[0055] In step (3), the post-curing time can also preferably be 1h-5h, and the post-curing temperature is preferably 30°C-50°C higher than the curing temperature. ...

Embodiment 1

[0059] This embodiment provides a shape memory epoxy resin, which includes 100 parts by weight of epoxy resin, 30 parts by weight of curing agent and 3 parts by weight of hyperbranched polyester.

[0060] Among them, the epoxy resin is 4,5-epoxy tetrahydrophthalate diglycidyl ester TDE-85.

[0061] The curing agent is 4,4'‐diaminodiphenylmethane.

[0062] The hyperbranched polyester is an aliphatic hydroxyl-terminated hyperbranched polyester. Each hyperbranched polyester molecule contains 48 hydroxyl-terminated functional groups. The molecular weight of the hyperbranched polyester is 5450, and the softening point is 100°C ± 5°C.

[0063] The preparation method of the shape memory epoxy resin of the present embodiment comprises the following steps:

[0064] (1). Epoxy resin and hyperbranched polyester are mixed in proportion and constantly stirred until hyperbranched polyester is completely dissolved in epoxy resin;

[0065] (2). Add curing agent in proportion and continue to...

Embodiment 2

[0070] This embodiment provides a shape memory epoxy resin, which includes 100 parts by weight of epoxy resin, 19 parts by weight of curing agent and 6 parts by weight of hyperbranched polyester.

[0071] Wherein, the epoxy resin is bisphenol A epoxy resin E51.

[0072] The curing agent is 4,4'‐diaminodiphenylmethane.

[0073] The hyperbranched polyester is an aromatic carboxyl-terminated hyperbranched polyester, and each hyperbranched polyester molecule contains 12 carboxyl-terminated functional groups. The molecular weight of the hyperbranched polyester is 2680, and the softening point is 100°C±5°C.

[0074] The preparation method of the shape memory epoxy resin of the present embodiment comprises the following steps:

[0075] (1). Epoxy resin and hyperbranched polyester are mixed in proportion and constantly stirred until hyperbranched polyester is completely dissolved in epoxy resin;

[0076] (2). Add curing agent in proportion and continue to stir until the mixture is e...

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Abstract

The invention relates to a shape memory epoxy resin and a preparation method thereof. The shape memory epoxy resin comprises epoxy resin, a curing agent and hyperbranched polyester at a weight part ratio of 100:(8-80):(3-20). The preparation method comprises the following steps: firstly mixing the epoxy resin and hyperbranched polyester, then adding the curing agent, evenly mixing, then injecting into a die, curing at 50 DEG C-170 DEG C for 1h-6h, then curing at 80 DEG C-200 DEG C for 0h-6h, cooling to room temperature and demoulding, so as to obtain the shape memory epoxy resin. The shape memory epoxy resin has high tenacity within the secondary shape forming temperature range, and has no difference in heat resistance property compared with the corresponding type of shape memory epoxy resin without hyperbranched polyester, is difficult to crack and damage, and has great values on the engineering application aspect of a shape memory epoxy resin-based composite material.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a shape-memory epoxy resin and a preparation method thereof. Background technique [0002] Shape memory epoxy is a type of shape memory polymer. There are generally two-phase structures in shape memory polymers: a reversible phase (soft segment) and a stationary phase (hard segment). Above the softening temperature, the reversible phase changes from a glassy state to a high elastic state, and a new shape is given to it under the action of an external force (called secondary shaping), and the shape remains unchanged. When the temperature is lowered below the softening temperature of the reversible phase, the reversible phase From the highly elastic state back to the glass state, the stress is frozen, and the shape of the polymer remains unchanged after the external force is removed. When recovering, the temperature is raised above the reversible phase softening temperature. At thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L67/00C08G59/42C08G59/50
Inventor 李文晓陈巧峰赵鹏飞侯仰青张华振
Owner TONGJI UNIV
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