A preparation method of 3D printing high-strength and high-toughness electromagnetic protection material

Abstract

The invention is a preparation method of a 3D printing high-strength and high-toughness electromagnetic protection material, which uses phosphate cement, polyacrylonitrile short fibers and nano-Fe 3 o 4 with SiO 2 The prepared wave absorbing agent prepares the integrated functional phosphate cement MPC of absorbing and strengthening, and through the intelligent, flexible and precise 3D printing technology, prints double-layer MPC on the surface of the concrete to achieve rapid repair of the concrete structure. Dual effects of electromagnetic protection and fracture toughness enhancement. The process is simple and easy to operate, the electromagnetic protection effect and fracture toughness of the concrete structure are obviously improved, the stability is good, and it has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of new building materials. Specifically, it relates to a preparation method of a 3D printing high-strength and high-toughness electromagnetic protection material. Background technique [0002] At present, there are many technologies and researches on the electromagnetic protection of concrete structures. Electromagnetic protective coatings are the most widely used because of their low cost, simple process, strong applicability, and no need for special equipment. Applying a layer of coating on the surface of the building structure can achieve Electromagnetic protection effect. 3D printing technology has been widely used due to its characteristics of no model, intelligence, flexibility and speed. The combination of 3D printing technology and electromagnetic protection technology can effectively purify the electromagnetic pollution environment and establish a green electromagnetic ecological balance. [0003...

AI Technical Summary

Problems solved by technology

However, it is susceptible to changes in ambient temperature and humidity and different ways of use, resulting in problems such as low service life, easy to fall off, easy to crack, and poor environmental friendliness, which seriously reduces its electromagnetic protection performance.

For the research of commonly used electromagnetic absorbing materials, most of them focus on ordinary Portland cement-based electromagnetic protection materials, which have poor adhesion and cannot bond the surface of the existing structure, and cannot achieve the effect of rapid repair of electromagnetic protection.

[0005] 2) Poor electromagnetic protection effect: The traditional construction process is manual stirring and smearing of electromagnetic protection materials, which cannot guarantee the uniformity of all material composition and application process, so the thickness and material uniformity of the electromagnetic protection layer cannot be guaranteed, which may easily cause partial electromagnetic protection failure

Moreover, the construction steps of electromagnetic protection structures manufactured by traditional manual painting and spraying processes are cumbersome, the construction level is high, and the construction quality is difficult to guarantee, which also reduces the electromagnetic protection effect.

In addition, artificial coating of the surface of the protective coating cannot make a textured surface structure (such as "S-shaped", "X-shaped" and strip-shaped structures), which also greatly reduces the absorption efficiency of electromagnetic waves

[0006] 3) Low strength and toughness: Commonly used cement-based electromagnetic protection materials are mostly resistive and dielectric wave-absorbing aggregates modified cement-based materials, which have single functionality, low strength and toughness, and are prone to damage to the protective layer under external force

For example, graphite-modified cement-based materials, because the addition of graphite reduces the working performance and strength index of concrete, thus reducing its structural performance; ferrite-modified cement-based materials, which have a single function and only have electromagnetic protection properties, The strength and toughness properties of the material cannot be guaranteed

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