Composite corrosion inhibition antisludging agent for ultralow rigidity circulation cooling water and preparation method thereof

Abstract

The invention provides a composite corrosion inhibition antisludging agent for ultralow rigidity circulation cooling water. The composite corrosion inhibition antisludging agent comprises the following raw materials in parts by weight: 5-15 parts of amino trimethylene phosphonic acid, 5-15 parts of hydroxyethylidene diphosphonic acid, 1-15 parts of diethylenetriamine pentamethylene phosphonic acid, 5-15 parts of hydrolytic polymaleic anhydride, 2-15 parts of terpolymer, 2-20 parts of heptahydrate, 0.1-2 parts of hydroxy benzotriazole and 3-79.9 parts of pure water. The hydroxy benzotriazole is added after the amino trimethylene phosphonic acid, the hydroxyethylidene diphosphonic acid, the diethylenetriamine pentamethylene phosphonic acid, the hydrolytic polymaleic anhydride and the terpolymer are stirred and mixed; and the composite corrosion inhibition antisludging agent is obtained by adding the water and the heptahydrate until the hydroxy benzotriazole is entirely dissolved. The hydrolytic polymaleic anhydride and the terpolymer used by the invention have a good diffusion effect, and can effectively prevent carbonates, phosphates and the like from being deposited and scaled. Meanwhile, the hydrolytic polymaleic anhydride and the terpolymer belong to a non-phosphate monomer, so that the agent phosphate content is reduced. Therefore, the composite corrosion inhibition antisludging agent is beneficial to environmental protection.

Description

technical field

[0001] The invention belongs to the technical field of industrial circulating cooling water treatment, and in particular relates to a composite corrosion and scale inhibitor for ultra-low hardness circulating cooling water and a preparation method thereof. Background technique

[0002] According to statistics, cooling water accounts for 67% to 80% of all water consumption in modern factories. my country has a vast territory, and the water quality varies greatly in different regions. For circulating water systems with high hardness, water softening and other methods can be used to solve the problem. However, in my country's South China coastal areas and other areas, the water hardness is less than 20 mg / L (calculated as CaCO 3 total alkalinity<50 mg / L, pH≈6, which belongs to ultra-low hardness and strong corrosive water quality, which is extremely corrosive to carbon steel equipment. If it is not handled properly, it will cause serious corrosion of equipme...