A kind of anti-radiation sandwich pipe and its preparation method

Abstract

The invention discloses a radiation protection sandwich pipeline, belonging to the technical field of radiation protection and pipeline transportation, comprising two first diameter pipes and a second diameter pipe with different diameters, and the second diameter pipe set forms a sandwich pipe on the outer circumference of the first diameter pipe. Forming a central hole in the first diameter pipe, forming an interlayer between the first diameter pipe and the second diameter pipe, and filling the slurry in the interlayer to form a polymer intermediate layer; wherein the slurry comprises a prepolymer, The radioactive functional powder and the inorganic modified powder are shielded, and the mass ratio of the shielding radioactive functional powder and the inorganic modified powder to the prepolymer mass ratio is 0.5 to 4.0:1.0. The invention adds the shielding radioactive functional powder and the inorganic modified powder in the process of preparing the slurry, and the preparation method has the advantages of simple process, easy promotion and application, and good practicability.

Description

technical field [0001] The invention belongs to the technical field of radiation protection and pipeline transportation, and in particular relates to a radiation-proof interlayer pipeline and a preparation method thereof. Background technique [0002] The nuclear industry involves a variety of radioactive levels and / or corrosive liquids, off-gases and dusts, process transport issues between separation, incineration, solidification, dust control, etc. For example, nuclear waste liquid is not only radioactive with strong energy and penetrating ability, but also corrosive, which puts forward requirements for pipelines such as corrosion resistance, radiation protection, impact resistance and long life, especially high requirements for radiation protection. Except for titanium steel, most metal pipes are not corrosion-resistant. The service life of stainless steel pipes is generally only 5 years, and that of carbon steel is 2 years or even shorter; the corrosion resistance of pla...

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Problems solved by technology

[0003] Inorganic material pipelines have good corrosion resistance and good weather resistance. Moreover, adding elements such as lead and barium in the process of preparing pipelines can make the material have a certain radiation resistance. However, inorganic materials are brittle materials, and glass with lead and barium added It is a typical brittle material, with poor impact resistance and poor safety, which limits the application of inorganic material pipelines in nuclear power plants and other transportation involving radioactive and / or corrosive liquids, gases and dust; theoretically, in the process of preparing plastic pipes and FRP pipes It is also possible to add lead and barium components that have shielding ability to radioactivity, but a large number of tests show that there are often contradictions between the shielding performance of the material and its resistance to medium pressure, mechanical strength, processing performance, etc., which limits its application and development, and its resistance Corrosion performance is far from that of inorganic materials

[0004] In order to reduce the joints connecting engineering pipelines, the transmission pipeline has to meet the specification requirements of a certain length, but the existing technology and equipment for preparing laminated flat glass have strict restrictions on the length of the prepared products, which is not suitable for the production of interlayer transmission pipelines

[0005] In addition, due to the requirement for the transparency of laminated flat glass, the choice of modified material types is limited, the middle layer is pure organic matter, lacks energy dissipation mechanism, and the advantages of material compounding have not been fully utilized, which limits the application of laminated materials. function development

The existing curing process and equipment for preparing laminated flat glass by the grouting method cannot eliminate the exothermic heat of curing or heat the curing in time, while the curing of the prepolymer requires a strict "temperature-time" system to improve the curing quality of the intermediate layer

[0006] The existing technology adopts swing method or vacuum kettle method to remove the air bubbles in the middle layer, which has the disadvantages of cumbersome operation, low efficiency and unstable quality

The swing method utilizes the buoyancy of the bubbles in the prepolymer, and the swing causes the bubbles to rise and discharge the bubbles; the vacuum kettle method not only evacuates the intermediate layer, but also requires the inner space of the vacuum kettle to reach a certain degree of vacuum, so it takes a long time. vacuuming time, high energy consumption

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