A kind of preparation method for the microcapsule of rubber material self-repair

Abstract

The invention relates to a preparation method of microcapsules for rubber material self-repair. The method is to prepare in advance an emulsion system with dicyclopentadiene (oil phase) as the continuous phase and a mixed solution of urea and formaldehyde (water phase) as the dispersed phase, and to the emulsion system under certain stirring speed, temperature and pH conditions. Add half of the curing agent, a pH regulator, and the other half of the curing agent in sequence to the emulsion system, and suction filter while hot to obtain microcapsules of dicyclopentadiene coated with urea-formaldehyde resin. In the inventive method involved in the present invention, the entire reaction process is carried out in one reaction container, and the operation is simple; the gradual addition of the curing agent in the preparation of the microcapsules replaces the one-time addition of the curing agent, preventing the agglomeration of the microcapsules. The particle size distribution of the microcapsules prepared by the invention is uniform, and the coating is uniform and complete. The microcapsules are added to the rubber matrix to successfully puncture the microcapsules, and the process of the capsule core flowing out from the microcapsules and healing the rubber is observed.

Description

technical field [0001] The invention relates to a preparation method of microcapsules for self-repair, in particular to a preparation method of microcapsules for self-repair of rubber materials. Background technique [0002] A microcapsule is a tiny container with a core-shell structure formed by coating a dispersed solid, liquid or gas with a film-forming material. The coating film formed by the film-forming material is usually called a wall material or a capsule wall (generally made of natural Formed or synthetic polymer materials), the material coated inside the film-forming material is called the core material or capsule core. The size and shape of microcapsules vary in a wide range with different preparation processes. The size of microcapsules is usually in the range of 2 to 1000 μm. Capsules with a diameter of less than 1 μm are called nanocapsules, and capsules with a diameter greater than 1000 μm are called macrocapsules. The thickness of the capsule wall varies f...

AI Technical Summary

Problems solved by technology

[0006] At present, Beijing University of Chemical Technology has done research on the preparation method of microcapsules for self-repair of rubber materials, but because the entire reaction needs to be completed in two containers, the rotation speed is not well controlled, and the temperature rises during the coating If the temperature is too high, too much curing agent is added at one time, and the coating time is not enough, the prepared microcapsules have uneven particle size, incomplete coating, and are prone to agglomeration.

Images