Self-repairing repeatable-processed polysiloxane elastomer, preparation method and application

Abstract

The invention relates to the technical field of novel materials and specifically relates to self-repairing repeatable-processed polysiloxane elastomer, a preparation method and application. The self-repairing repeatable-processed polysiloxane elastomer has a following structural formula shown in a following image, wherein the R and the R1 in the structural formula are long chains prepared from carbon, hydrogen, oxygen and nitrogen. The prepared self-repairing repeatable-processed polysiloxane elastomer disclosed by the invention has the following advantages: a molecular main chain has urea bonds, and hydrogen bonds formed between the urea bonds can improve mechanical strength of materials; under catalytic action of metal ions, the urea bonds have thermal reversibility, and the material notonly has a self-repairing effect, but also can be recycled and processed again; the material can be applied to the fields of 3D printing, flexible electrode base materials and the like; a preparationtechnology is simple, and cost is relatively lower.

Description

Technical field [0001] The invention relates to the technical field of new materials, in particular to a self-repairing and repeatable polysiloxane elastomer and a preparation method and application thereof. Background technique [0002] The main chain of polysiloxane is composed of silicon and oxygen atoms alternately, and organic groups are directly connected to the silicon atoms. It has the characteristics of both inorganic and organic polymers, such as high and low temperature resistance, weathering resistance, electrical insulation, ozone resistance, Hydrophobic, good gas permeability, non-toxic, biologically inert, etc. It is widely used in electrical and electronic, construction, automotive, textile, medical and other fields. The molecular chain of polysiloxane is flexible and the intermolecular force is low, so it is usually used in the form of cross-linked elastomer. Traditional polysiloxane elastomer faces the same problems as all thermosetting materials: (1) The mater...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, for the existing reversible covalently crosslinked polysiloxane elastomers containing hydrogen bonds or borate bonds have poor mechanical properties, high reprocessing temperature, and Diels-Alder bond crosslinking To solve the problem that the mechanical properties and self-healing properties of polysiloxane elastomers cannot be improved at the same time, the present invention provides a self-healing and reprocessable polysiloxane elastomer containing a metal ion catalyst and its preparation method. It is obtained by the reaction of primary amines and isocyanates. Under the catalysis of metals, it is a new type of thermoresponsive dynamic bond, which can make the material self-healing at 80°C, and the hydrogen bond interaction between urea bonds can improve the durability of the material. Mechanical strength, the elastomer has excellent mechanical properties, certain transparency, good reprocessing performance, high self-repair efficiency, low repair temperature, simple preparation process, and relatively low cost

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