Production technology for nodular cast iron pipe lining epoxy ceramic

Abstract

The invention belongs to the field of nodular cast iron pipe corrosion prevention, and particularly relates to a production technology for nodular cast iron pipe lining epoxy ceramic. The production technology comprises the steps that after being preheated, a nodular cast iron pipe metal base body rotates at high speed under the drive of a carrier roller, a coating machine coats the interior of the pipe body with liquid A and liquid B at uniform speed, an antifoaming agent with the weight being 3% of the total weight of the liquid A and the liquid B is added into the liquid A and the liquid B for synchronous coating, and an epoxy ceramic coating layer is formed on the inner surface of the pipe body after cooling and solidification. The liquid A is formed by mixing, by mass, 20-30% of quartz powder and 70-80% of epoxy resin. The liquid B is formed by mixing, by mass, 20-30% of quartz powder and 70-80% of polyamide curing agent. The weight ratio of the liquid A to the liquid B ranges from 1:1 to 1:1.2. By the adoption of the production technology, pin hole and bubble phenomena produced on the surface of epoxy ceramic are avoided, the surface of the epoxy ceramic is smooth and flat, and no electric leakage phenomenon exists through electric spark detection.

Description

technical field [0001] The invention belongs to the field of anticorrosion of ductile iron pipes, and in particular relates to a production process for lining epoxy ceramics of ductile iron pipes. Background technique [0002] With the development of the cast pipe industry, ductile iron pipes are recognized and accepted by more and more users. At the same time, higher requirements are put forward for the anti-corrosion performance of cast pipes. However, more than 95% of the internal anti-corrosion materials of ductile iron pipes used in the market are still limited to ordinary cement mortar. Its disadvantage is that it cannot be used for the transportation of corrosive media such as acid and alkali. Before the lined epoxy ceramic ductile iron pipe products, sulfate-resistant cement and high-alumina cement were used to replace ordinary Portland cement for sewage transportation. However, its ability to resist acid and alkali erosion is far from satisfying the use in some sp...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a production process for a ductile iron pipe lined with epoxy ceramics with uniform coating thickness, smoothness, and no pinholes, so as to solve quality problems such as pinhole defects, slow curing, instantaneous curing, and air bubbles.