Phosphorus-free oil removing powder and phosphorus-free oil removing process

Abstract

The invention discloses phosphorus-free oil removing powder, which comprises the following raw materials in part by mass: 10 to 25 parts of sodium hydroxide, 20 to 32 parts of sodium carbonate, 20 to 35 parts of phosphorus-free builder, 5 to 10 parts of sodium sulfate, 1 to 5 parts of sodium citrate, 1 to 5 parts of sodium gluconate and 6 to 12 parts of surfactant. A phosphorus-free oil removing process using the phosphorus-free oil removing powder comprises the following steps of: preparing cleaning solution from the phosphorus-free oil removing powder and water, and adding into a cleaning tank, wherein the pH of the cleaning solution is 12.5 to 13.5; and putting a workpiece into the cleaning solution, soaking and cleaning. Phosphorus-free oil removing liquid prepared from the phosphorus-free oil removing powder does not contain phosphorus, is environmental-friendly, has a cleaning effect superior to that of the conventional pretreatment oil removing process, and has longer service life; and the generated wastewater is easier to treat.

Description

technical field [0001] The invention relates to a phosphorus-free oil removal powder and a phosphorus-free oil removal process. Background technique [0002] Because phosphate has good chelating ability and builder effect, it is widely used in traditional industries and other fields after it is compounded as a builder and surfactant to form a cleaning agent. However, since this cleaning agent contains phosphorus, when it is discharged as waste water, it will cause eutrophication of the water body, causing a large number of algae and other aquatic plants to multiply, and the aerobic respiration of the plants will consume a large amount of oxygen in the water. Aquatic animals are hypoxic to death and a series of natural disasters (such as cyanobacteria events that have erupted in Taihu Lake, Anhui Chaohu Lake, Yunnan Dianchi Lake, etc., as well as global marine red tides, etc.), have seriously affected human drinking water safety. [0003] Since the 1990s, more and more compa...

AI Technical Summary

Problems solved by technology

However, since this cleaning agent contains phosphorus, when it is discharged as waste water, it will cause eutrophication of the water body, causing a large number of algae and other aquatic plants to multiply, and the aerobic respiration of the plants will consume a large amount of oxygen in the water. It causes aquatic animals to die due to hypoxia and produces a series of natural disasters (such as the cyanobacteria incidents that broke out in Taihu Lake in Jiangsu, Chaohu Lake in Anhui, and Dianchi Lake in Yunnan, as well as the global marine red tide phenomenon, etc.), which has seriously affected the safety of drinking water for human beings.

[0003] Since the 1990s, more and more companies have begun to develop phosphorus-free cleaning agents, and the development of phosphorus-free cleaning agents for pre-treatment in the electroplating industry began in the late 1990s. However, due to the use of phosphorus substitute additives in The comprehensive performance such as builder effect, chelating ability, and wash-off performance is not comparable to that of phosphate builders, so there is still no electroplating pretreatment product that can completely replace phosphate-containing degreasing powder