A kind of room temperature self-healing material and preparation method thereof

Abstract

The invention belongs to the field of new materials. The invention relates to a room-temperature self-repairing material and a preparation method thereof. The method uses hydrogen-containing siloxane, epoxy resin, and diamine as raw materials, and undergoes hydrosilicon addition reaction, epoxy resin ring-opening reaction, and oxidation reaction respectively. The multi-step reaction is completed. Through molecular structure design, polymer structure adjustment and polymerization process optimization, a room temperature self-healing polythiourethane material is synthesized and formulated into a room temperature self-healing varnish. The composite material not only effectively solves the shortcomings of the current self-healing materials such as low repair rate, limited number of repairs, or the need for external energy or healing agents, but also has the effect of hydrophobic and anti-fouling, which can greatly broaden its application field.

Description

technical field [0001] The invention relates to a room temperature self-repairing material and a preparation method thereof. The invention belongs to the field of new materials. Background technique [0002] Polyurethane refers to a class of polymers containing a large amount of carbamate in the molecular structure, also known as polyurethane, English abbreviation PU. Since the performance of polyurethane materials can be realized by adjusting its molecular structure, and the method is relatively simple, the application of polyurethane materials covers the five major fields of polymer material coatings, plastics, rubber, fibers and adhesives, and is widely used in construction, automobiles, etc. , electronics, packaging, clothing, footwear and other industries. [0003] Polythiourethane, combining the characteristics of polysulfide and polyurethane. It has the advantages of high strength, tear resistance, puncture resistance, abrasion resistance, good adhesion, low temper...

AI Technical Summary

Problems solved by technology

It has the advantages of high strength, tear resistance, puncture resistance, abrasion resistance, good adhesion, low temperature resistance, oil resistance, acid and alkali resistance, and good fatigue resistance. Polythiourethane materials are commonly used in hydrogels, airport runways, Sealants, etc., in the actual use process, will inevitably be damaged by external forces to produce defects, and lead to the loss or reduction of its related properties, resulting in shortened material life, reduced material safety, and increased material maintenance costs

However, most of the materials currently used cannot be repaired after defects are generated, and some materials can be repaired, but the repair process requires additional healing agents or energy (such as heating, light, pressure, etc.) input or limited number of repairs, etc. This greatly limits the actual usage requirements

In addition, there are few reports of materials that can spontaneously self-heal at room temperature (without the need for additional healing agents or energy). Partial self-healing is also conditioned on the compromise of mechanical properties, and it is accompanied by high preparation costs and complex synthesis processes. And other issues

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