Preparing method of thermally-driven self-repairing elastomer based on hydrogen-bond interaction

Abstract

The invention provides a preparing method of thermally-driven self-repairing elastomer based on hydrogen-bond interaction. The method comprises the steps that firstly, ureido pyrimidone type mono-isocyanate molecules are prepared, then diisocyanate is used for carrying out chain extension on low polymer glycol to prepare a hydroxyl-terminated polyurethane low polymer, and finally, Upy-terminated type thermally-driven self-repairing elastomer is prepared by terminating the hydroxyl-terminated polyurethane low polymer with UPY-NCO; secondly, ureido pyrimidone type diisocyanate is prepared, then ureido pyrimidone type diisocyanate and the low polymer glycol are subjected to addition polymerization, and the hydrogen bond network type thermally-driven self-repairing elastomer with Upy units in a main chain controllable is prepared. Compared with a traditional foreign-aid type self-preparing material (a micro capsule type, a micro vessel type and the like), the thermally-driven self-repairing material is a thermoplastic material and can be repeatedly processed and used, and theoretically multi-time repairing capability can be achieved at the same position.

Description

technical field [0001] The invention relates to a preparation method of a hydrogen bond intrinsic type polyurethane elastomer material with self-repair function, in particular to a preparation method of a heat-driven self-repair elastomer based on hydrogen bond action. [0002] technical background [0003] When the material is subjected to external mechanical action, it is easy to cause damage to the surface or inside of the material, causing cracks in the material, and seriously affecting the mechanical properties and service life of the material. In order to solve the problem that materials are prone to damage during use, people have introduced the concept of self-repair. As a new type of intelligent material, self-healing materials have important development prospects and application value in some important projects and special fields. [0004] At present, more studies are made on the use of microcapsule self-healing materials coated with repairing agents. Although this ...

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Problems solved by technology

[0004] At present, more studies are made on the use of microcapsule self-healing materials coated with repairing agents. Although this repairing material has a certain self-repairing ability, it also has shortcomings, such as: each repairing agent corresponds to a limited matrix and is limited in the material. Each place has only one repair ability; the stability of the microcapsules in the base material is poor and cannot exist stably in the base material for a long time; when the material cracks, it is impossible to ensure that the microcapsules break and release the repair agent every time

At present, self-healing materials prepared by directly capping polyester diols, hydroxyl silicone oils, and polyether diols with Upy have shortcomings such as low strength, poor elasticity, and high repair temperature.

Although the supramolecular polymer prepared by using Upy to end-cap the relatively hard PCDL can obtain higher strength, but its elongation is low, the elasticity is poor, the repair efficiency is low and the repair temperature is high, as shown in the comparison sample in Table 1

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