Phosphorus-free corrosion and scale inhibitor as well as preparation method and application thereof

Abstract

The invention discloses a phosphorus-free corrosion and scale inhibitor as well as a preparation method and application thereof. The phosphorus-free corrosion and scale inhibitor is prepared from the following raw materials in parts by weight: 2 to 7 parts of polyvinylpyrrolidone, 1 to 5 parts of neatfoot oil, 23 to 31 parts of attapulgite and 8 to 15 parts of liquiritin. The preparation method comprises the following steps: mixing the attapulgite with a prepared polyvinylpyrrolidone solution and performing heat treatment; then adding a prepared liquiritin solution and performing heat treatment; adding the neatfoot oil, performing heat treatment and then calcining at high temperature to obtain a finished product. The phosphorus-free corrosion and scale inhibitor prepared by the preparation method disclosed by the invention is free of phosphorus, is good in biodegradability and is free of toxin and pollution to the environment; a corrosion and scale inhibition effect of the phosphorus-free corrosion and scale inhibitor is superior to that of a phosphorus-containing water treatment agent. The raw materials are abundant in sources, a preparation process is simple and the cost is low. When the phosphorus-free corrosion and scale inhibitor is applied to an industrial circulating cooling water system, under the condition of water quality in the embodiment, when the dosage of a medicament is 30mg / L, a corrosion rate of carbon steel is smaller than 0.075mm / a stipulated by national standard, and a scale inhibition rate reaches 98 percent or above. The phosphorus-free corrosion and scale inhibitor disclosed by the invention is low in dosage, low in production cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of water treatment materials, in particular to a phosphorus-free corrosion and scale inhibitor and its preparation method and application. Background technique [0002] China's total water resources are 2.8 trillion cubic meters, accounting for 7% of the world's total water resources, but China's per capita water resources are only 2304m 3 / person, belonging to countries with water shortages. The problem of water shortage is becoming more and more serious, which has become a major obstacle restricting my country's sustainable development. Due to the lack of water in our country's cities, the annual economic loss reaches more than 120 billion yuan, so saving water is urgent. Among people's water use, except agriculture is the largest water use, the second is industrial water, and industrial cooling water accounts for about 70% of the total industrial water use. Therefore, the industry must adopt circulatin...

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Problems solved by technology

[0003] During the recycling process of industrial cooling water, there will be different degrees of inorganic salt deposition, corrosion, bacteria and algae growth and other problems, resulting in serious consequences such as reduced efficiency of heat exchange equipment, blockage, corrosion and perforation, and bring great hidden dangers to industrial production.