Low-phosphorus scale and corrosion inhibitor, and preparation method thereof

Abstract

The invention belongs to the technical field of scale and corrosion inhibition, and discloses a low-phosphorus scale and corrosion inhibitor, and a preparation method thereof. The low-phosphorus scaleand corrosion inhibitor comprises, by weight, 10-20 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid, 5-12 parts of polyaminopolyether methylene phosphonate, 8-15 parts of polyaspartic acid, 5-12parts of phosphonocarboxylic acid, 8-15 parts of an itaconic acid copolymer, 5-12 parts of a water-soluble zinc salt and 3-7 parts of an acid. The preparation method comprises the following steps: A,slowly adding the acid to water, and then adding the water-soluble zinc salt to obtain an acid solution of the zinc salt; and B, adding the 2-phosphonobutane-1,2,4-tricarboxylic acid, polyaminopolyether methylene phosphonate, polyaspartic acid, phosphonocarboxylic acid and itaconic acid copolymer to the acid solution of the zinc salt at a constant temperature, performing uniform stirring, and cooling the obtained mixture to room temperature in order to obtain the low-phosphorus scale and corrosion inhibitor. The low-phosphorus scale and corrosion inhibitor has the characteristics of good stability, low phosphorus, environmental protection and low cost.

Description

technical field [0001] The invention belongs to the technical field of scale and corrosion inhibition, in particular to a low-phosphorus scale and corrosion inhibitor and a preparation method. Background technique [0002] Industrial circulating cooling water is the main body of industrial water, and improving its reuse rate and recycling is a necessary means of saving water and energy. [0003] The industrial circulating cooling water is continuously evaporated during the cooling process, so that the salt concentration in the water continues to increase, which exceeds the solubility of some salts and deeply adheres to the system pipe wall to form scale. Common ones are calcium carbonate, calcium phosphate and magnesium silicate. The generation of scale greatly reduces the heat transfer efficiency, and the scale thickness of 0.5mm reduces the heat transfer coefficient by 15%-20%. At the same time, because the main equipment of the cooling water system is carbon steel, diss...

AI Technical Summary

Problems solved by technology

However, the current scale and corrosion inhibitors are usually difficult to maintain good scale and corrosion inhibition effects under the current increasingly complex water quality conditions