Composite anti-dirty corrosion inhibiting agent and application thereof

[0069] Add polyaspartic acid (produced by Changmao Biochemical Engineering Co., Ltd., content: 40%, molecular weight: 4000-5000) in the four-necked flask equipped with stirrer, reflux condenser, constant pressure dropping funnel and thermometer 91.6g and 157ml of water, start stirring to fully dissolve polyaspartic acid. At room temperature (20° C.), 26.6 g of formaldehyde aqueous solution (36% of active ingredients) was added. Control the reaction temperature below 50° C. with a cold water bath, and add 45.2 g of phosphorus trichloride dropwise (the active ingredient is calculated as 97%). After the dropwise addition of phosphorus trichloride is complete, raise the temperature to 70±2°C and keep it warm for 2 hours, then cool to obtain the product. The organic phosphine content of the product was 8.2%.

[0071] Add polyaspartic acid (produced by Changmao Biochemical Engineering Co., Ltd., content: 40%, molecular weight: 4000-5000) in the four-necked flask equipped with stirrer, reflux condenser, constant pressure dropping funnel and thermometer 91.6g and 157ml of water, start stirring to fully dissolve polyaspartic acid. At room temperature (20° C.), 26.6 g of formaldehyde aqueous solution (36% of active ingredients) was added. Control the reaction temperature below 50° C. with a cold water bath, and add 45.2 g of phosphorus trichloride dropwise (the active ingredient is calculated as 97%). After the dropwise addition of phosphorus trichloride is complete, raise the temperature to 105±2°C and keep it warm for 2 hours, then cool to obtain the product. The organic phosphine content of the product was 7.3%.

[0073] Add polyaspartic acid (produced by Changmao Biochemical Engineering Co., Ltd., content: 40%, molecular weight: 4000-5000) in the four-necked flask equipped with stirrer, reflux condenser, constant pressure dropping funnel and thermometer 91.6g and 157ml of water, start stirring to fully dissolve polyaspartic acid. At room temperature (20° C.), 26.6 g of formaldehyde aqueous solution (36% of active ingredients) was added. Control the reaction temperature below 50° C. with a cold water bath, and add 45.2 g of phosphorus trichloride dropwise (the active ingredient is calculated as 97%). After the dropwise addition of phosphorus trichloride is complete, raise the temperature to 90±2°C and keep it warm for 4 hours, then cool to obtain the product. The organic phosphine content of the product is 9.5%.