Neutral multifunctional steel surface treating agent and preparation method

Abstract

The invention discloses a neutral multifunctional steel surface treating agent, which does not generate waste acid, is environmental-friendly, and comprises the following raw materials in percentage by mass: 12-43 percent of organic acid, 0.2-4 percent of catalyst, 12-43 percent of multivalent nitrogen compound, 0.01-3 percent of inhibitor, 0.5-5 percent of film-forming agent, 0.5-4 percent of surface active agent, and the balance water. A preparation method comprises the following steps of: adding the catalyst, the multivalent nitrogen compound and the water with calculated quantity into the organic acid; starting to stir and heating in a reaction kettle, wherein the temperature is controlled to be 80-120 DEG C, and the reaction time is 2-4h; generating amide through a reaction product, wherein the amide is not acid and has a pH value being 6-7; adding the inhibitor, the film-forming agent and the surface active agent; and uniformly stirring.

Description

technical field [0001] The invention belongs to the field of fine chemicals, in particular to an environment-friendly neutral multifunctional steel surface treatment agent and a preparation method thereof, which do not produce waste acid. technical background [0002] At present, a multifunctional steel surface treatment solution (general technical standard is GB / T12612-2006) is commonly used in the machinery manufacturing equipment industry. It uses water as a carrier and contains phosphoric acid and organic acids (rust removers), surfactants ( Degreasing and degreasing agent), zinc salt (film forming agent) and accelerator, corrosion inhibitor, etc., can achieve degreasing, derusting and phosphating by brushing, immersing, spraying and other treatments on the steel surface , anti-rust and passivation purposes. However, the existing treatment solution is acidic, and when the steel surface is repeatedly brushed and wiped, it will produce H 2 The stench of S not only pollut...

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Problems solved by technology

However, the existing treatment solution is acidic, and when the steel surface is repeatedly brushed and wiped, it will produce H 2 The stench of S not only pollutes the air environment, but also seriously affects the health of the operator; soaking treatment will produce sediment and sludge in the treatment liquid tank, and the problem of waste acid treatment will occur during cleaning, increasing the use of treatment liquid Cost; the treatment liquid will also flow from the steel surface to the ground during spraying treatment, and there is a problem of serious corrosion and damage to the ground