What are the major components of metal cleaning agent is?

In the metal processing, the need for metal cleaning, cleaning objects there are two types, one is rust, first degreasing. We mainly about oil-cleaning. Clean metal surface oil cleaning agent can be divided into three categories: The first category is a solvent-based cleaning agent, the main component of gasoline, kerosene, diesel or halogenated hydrocarbon solvent; the second category is a water-based solvent of water cleaning agent, the main component of a surfactant; third category is a composite type cleaning agent, the main component of surfactant and solvent compound formed. Now known as metal cleaning agents generally refers to water wash off grease metal detergent.

Metal cleaning agent formulations usually contain the following major components.

(1) Surfactant

Due mainly targeted cleaning dirt, the choice of surfactants to contain oil molecular structure similar to hydrophobic groups, the main component of the oil is generally a mineral oil, animal and vegetable oils, it is used for metal cleaning agent surfactant is generally derivatives of aliphatic or aliphatic derivatives having an aromatic hydrocarbon, an HLB value is generally selected between 12 and 16. Preparation of metal cleaning agent raw materials more generally on the selection of a strong oil wetting, solubilizing and emulsifying ability of surfactants. Considering from other resources and cost factors, such as the use of oleic acid, triethanolamine, alkyl phosphate esters, ether or phenol ether phosphates, polyoxyethylene fatty alcohol ether. Of course, as with most detergents, formulations using a single surfactant which is better than a variety of surfactants fit together well. Therefore, the metal detergents contain two or more surfactants.

(2) basic salts and base

Bases and basic salts are also used as a solvent, it is widely used for cleaning metal, but also as an adjuvant with the surfactants used. They washed animal fats, fatty acids and hydrophilic dirt dirt effect is obvious, and even oil, fatty acids reacted with a dirt surface activity soap. When base is used alone to remove dirt capacity is limited, the surfactant was added agent, can improve the cleaning ability. Alkali and alkaline salts of certain metal corrosion, thus washing requirements higher quality metal parts, you can not use alkaline cleaning agents. Commonly used bases and basic salts include: sodium hydroxide, sodium carbonate, sodium hydrogen carbonate, orthosilicate, metasilicate, orthophosphate, pyrophosphate, tripolyphosphate, hexametaphosphate.

(3) rust inhibitor

Metal cleaning agent should contain a certain amount of rust inhibitor to reach the metal surface cleaning, no corrosion, no damage, after cleaning the metal surface clean and bright and have a certain corrosion rust requirements. Aqueous based cleaning agent added mainly for controlling the corrosion rate of corrosion inhibitor, there are two inorganic and organic. Rust inhibitor is to prevent atmospheric corrosion caused by rust oil soluble additive is used, the water used for metal cleaning agent, the surfactant can be dispersed in an aqueous solution.

Inorganic corrosion inhibitors used are: sodium nitrite, sodium nitrite + anhydrous sodium carbonate, trisodium phosphate, disodium hydrogen phosphate, sodium tripolyphosphate, sodium silicate, potassium dichromate, ammonium carbonate and the like.

Organic inhibitors are: sodium benzoate, ammonium, triethanolamine, diethanolamine, ethanolamine benzene, methenamine [(CH2) 6n4], urea, benzotriazole (C6H4N3H) and the like.

Inhibitor compound is also a good use of effects, such as sodium nitrite + triethanolamine, sodium tripolyphosphate +, has a good anti-corrosion effect. For different cleaning objects, preferably experimentally determined.

(4) a defoaming agent

Metal cleaning agent, generally require low foam or no foam state cleaning, mostly foam, will allow mechanized cleaning or continuous cleaning is not possible, especially in high-pressure spray cleaning requires the use of non-foaming cleaning agent. Therefore, metal cleaning agent requires a certain amount of anti-foaming agent. The most commonly used and representative defoamer: 2010 polyether, polyether L61 in, tributyl phosphate, silicone, oleic acid, sodium oleate and the like. Some defoamers

Ability to oil metal cleaning agents have a synergistic effect, while others have a negative effect, so screening defoamers varieties should be OK to go after other components of the selected test oil were combined and then given formulation.