Non-phosphate non-nitrogen easy-to- biodegrade metal spent meal and preparing method

Abstract

The invention discloses phosphor-free nitrogen-free biodegradable metal spent meal and a preparation method thereof, which belong to the technical field of surface cleaning of a metal material. The spent meal comprises the following compositions and content ( weight portion): 10 to 50 portions of sodium carbonate, 5 to 30 portions of sodium orthosilicate, 0.1 to 10 portions of gluconic acid sodium salt, 0.1 to 5 portions of sodium citrate, 0.1 to 5 portions of peregal 0-20, and 1 to 20 portions of linear alkyl polyoxyethylene ether sodium sulfate. The spent meal is prepared in certain feeding sequence, the compositions are fully and evenly mixed at normal temperature and normal pressure at the stirring speed of 10 to 100 revolutions/minute. At normal temperature, the spent meal has the advantages of fast oil removing, good effect, no phosphor or nitrogen, easy biodegradability, environmental pollution prevention, requirement accordance of energy conservation and discharge reduction, convenient transportation and storage, production and application cost conversation.

Description

technical field [0001] The invention relates to a degreasing powder for surface treatment of metal materials, in particular to a non-phosphorus, nitrogen-free and easily biodegradable metal degreasing powder and a preparation method thereof. Background technique [0002] Metal parts need to be cleaned and degreased before electroplating, painting, phosphating, and oil sealing. The chemical degreasing method is to use the saponification of alkali builders to remove saponifiable grease, and use the emulsification of surfactants Functions to remove non-saponifiable oil (mineral oil). Degreasing powder (agent) is used in chemical degreasing treatment. At present, the builders of most metal degreasing agents are still mainly phosphate and polyphosphate. Phosphate and polyphosphate are good builders, which can complex the metal ions dissolved in the lye and improve the detergency of the lye. It has oil-carrying ability and degreasing effect, and also has the properties of disper...

AI Technical Summary

Problems solved by technology

However, the extensive use of phosphate causes eutrophication of the water body, which does not meet the requirements of environmental protection.

Most of the existing phosphorus-free degreasing agents use metasilicate, but the building ability of metasilicate is poor

[0003] The surfactant systems commonly used in the existing degreasing powder are alkylbenzene sulfonate and alkylphenol polyoxyethylene ether series. Although these surfactants have certain biodegradation characteristics, the presence of benzene rings makes degradation difficult Thoroughly, at present, biodegradable degreasing powder also mainly...