| abstract |
The invention discloses a preparation method of a high-efficiency heat preservation, heat insulation, rust, corrosion, and aging elbow, belonging to the technical field of elbows. In the method of the invention, low-melting paraffin is used as the filler of the metal inner cavity, and then the metal straight pipe is bent or bent into a predetermined shape of the elbow, and then the outer side is coated with the elbow of the silica aerogel felt. It is soaked in special materials, cured at high temperature, and finally sprayed with polyurea coating on the outside of the elbow. The preparation method overcomes the serious concave, bulge, wrinkle and other distortions in the cross-section of the metal elbow after bending and forming in the prior art, and the problems of poor thermal insulation performance, leakage, easy corrosion and aging during use, etc. The bending quality of the metal elbow is improved, and the thermal insulation performance, anti-leakage, corrosion and aging resistance of the metal elbow are improved. |