Method for preparing high-strength corrosion-resistant ductile iron pipe

A corrosion-resistant and high-strength technology, applied in the field of the preparation of ductile cast pipes, can solve the problems of loose and loose cement on the inner wall of pipe fittings, affecting product quality, health effect and efficiency, reducing hollowing and peeling, and improving lining quality. , Guarantee the effect of service life

Inactive Publication Date: 2018-12-14
山西永益铸管股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Try not to move the cement on the inner wall of the pipe fittings before curing, otherwise, the cement on the inner wall of the pipe fittings that has not been cured will fall off and become loose due to shaking and collision, which will affect the product quality; because the number of cast iron pipe fittings that need to be cured is different, the curing area will also be different. Changes, too large or too small will have an impact on the effect and efficiency of health preservation

Method used

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  • Method for preparing high-strength corrosion-resistant ductile iron pipe

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Effect test

Embodiment 1

[0029] A preparation method of a high-strength corrosion-resistant ductile cast pipe, comprising the following steps:

[0030] 1) Clean the inner surface of the ball mill cast pipe, clean and polish the inner wall of the pipe to ensure that the inner wall of the pipe is clean and smooth;

[0031] 2) Brush the adhesive layer on the inner surface of the clean ball mill cast pipe, the thickness of the adhesive layer is 0.2-0.4mm, and paint in 1-3 times.

[0032] 3) When the adhesive layer is semi-dry, spray the prepared cement mortar on the adhesive layer under uniform stirring to form a cement mortar lining. During the spraying process, the ball mill cast pipe is rotated at high speed to make the cement mortar fit tightly. , evenly distributed, reducing hollowing; the thickness of the cement mortar is 2-6mm, and the rotation speed of the ball-milled cast pipe is kept at 300-700r / min to ensure that the cast pipe rotates smoothly along the central axis without vibration during the...

Embodiment 2

[0043] The specification of the high-strength and corrosion-resistant ball mill cast pipe is DN100, and the preparation method includes the following steps:

[0044] 1) Clean the inner surface of the DN100 ball mill cast pipe, clean and polish the inner wall of the pipe to ensure that the inner wall of the pipe is clean and smooth;

[0045] 2) Configure the adhesive layer, weigh the following components by weight: 1 part of cement, 1.5 parts of water, 0.001 part of hydroxypropyl methylcellulose, 0.01 part of styrene-butadiene rubber powder, mix well, and spray onto a clean ball mill On the inner surface of the casting pipe, the spraying thickness of the adhesive layer is 0.2mm, and the spraying is carried out in 1-3 times.

[0046] 3) After spraying the adhesive layer, the prepared cement mortar is sprayed onto the adhesive layer while stirring evenly to form a cement mortar lining. During the spraying process, the ball mill cast pipe is rotated at high speed to make the cemen...

Embodiment 3

[0054] The specification of the high-strength and corrosion-resistant ball mill cast pipe is DN700, and the preparation method includes the following steps:

[0055] 1) Clean the inner surface of the ball mill cast pipe, clean and polish the inner wall of the pipe to ensure that the inner wall of the pipe is clean and smooth;

[0056] 2) Configure the adhesive layer and weigh the following components by weight: 1.5 parts of cement, 2 parts of water, 0.01 part of hydroxypropyl methylcellulose, and 0.005 parts of styrene-butadiene rubber powder. After mixing evenly, spray onto a clean ball mill On the inner surface of the casting pipe, the spraying thickness of the adhesive layer is 0.3mm, and the spraying is carried out in 1-3 times.

[0057] 3) After spraying the adhesive layer, the prepared cement mortar is sprayed onto the adhesive layer while stirring evenly to form a cement mortar lining. During the spraying process, the ball mill cast pipe is rotated at high speed to make...

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Abstract

The invention discloses a method for preparing a high-strength corrosion-resistant ductile iron pipe. The method comprises the following steps: cleaning the inner surface of the ductile iron pipe; painting the inner surface of the ductile iron pipe with an adhesive layer; spraying cement lining mortar onto the adhesive layer; after smearing of the cement lining mortar is qualified, performing preservation; after finish of preservation, spraying an epoxy resin layer onto the cement lining mortar; and after normal-temperature drying of the epoxy resin layer, painting the upper surface of the epoxy resin layer with an un-fired ceramic layer. Preservation includes two stages of natural preservation and steam preservation which are performed successively. Painting of cement mortar needs to be performed in a uniformly stirred state, and the ductile iron pipe is rotated at a high speed in the painting process. By adoption of the method, the firmness of a cement mortar lining layer is enhanced, cracks are reduced, the service life of the ductile iron pipe is prolonged, and the comprehensive cost is lowered.

Description

technical field [0001] The invention discloses a method for preparing a high-strength, corrosion-resistant nodular cast pipe, belonging to the technical field of cast pipes. Background technique [0002] In recent years, ductile iron pipes have been widely promoted in the field of water transportation, and are widely used in large-scale water transportation projects such as South-to-North Water Diversion. In order to further prolong the service life of cast iron pipes, it is necessary to line them with cement mortar on their inner walls. Cement mortar lining has good anti-corrosion properties for cast iron pipes, but due to its inherent alkaline characteristics, it causes the pH value of water quality to increase and the aluminum ion content to increase during the initial stage of water delivery in pipes, especially small-diameter pipes. Affects the hygienic performance of water quality. [0003] The cement mortar lining is used as the drinking water delivery pipeline. Bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B19/00B28B11/24
CPCB28B11/245B28B19/0023
Inventor 史富陈立新
Owner 山西永益铸管股份有限公司
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