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Ashless Dispersant According To Its Chemical Composition
Sep 07, 2017

ashless dispersant According to its chemical composition

There are a wide variety of ash-free dispersants, and their classification method is relatively simple, mainly according to its chemical composition is divided into: inorganic chemical ash dispersant and organic chemical ashless dispersant; according to some of the ash-free dispersant may have different different dirt Role, or the same kind of dirt has two or more than the role, it should be in the general case of the main role of classification.

      Ashless dispersant

1. Water and non-aqueous solvents

The solvent of the soil is a substance that can peel off the soil in which the dirt to be washed is dissolved or dispersed, and that there is no stable, chemical composition. It includes water and non-aqueous solvents.

(1) water: water is the existence of nature, but also the most important solvent. In industrial cleaning, water is the solvent of most chemical ashless dispersants, and is the solvent of many soils. In the cleaning, where you can use water to remove dirt occasions, do not use non-aqueous solvents and various additives.

(2) non-aqueous solvents: non-aqueous solvents include hydrocarbons and halogenated hydrocarbons, alcohols, ethers, ketones, esters, phenols and the like and mixtures thereof are mainly used to dissolve organic soils such as greasy dirt and certain organic compounds.

2. Acid-base ashless dispersant

(And sometimes accompanied by oxidation - reduction and other reactions), so that the dirt into soluble or dispersed in the cleaning solution of ashless dispersant, mostly organic acids, inorganic acids, alkali and acid hydrolysis Or alkaline salts.

Most of the acid - alkali ash dispersant is composed of acid, alkali aqueous solution plus the necessary additives. Another type of acid or alkali acting in molten state and dirt under high temperature conditions, so that the original insoluble or insoluble in the cleaning medium in the dirt, into easily soluble compounds, such acids and alkali is often called melting agent. This ashless dispersant has a good effect when it is difficult to remove dirt with a solvent or solution.

3. Oxidation - Reducing agent

Mainly with the dirt and redox reaction occurs to remove the dirt of the preparation, that is, cleaning agent or reducing agent, including the melting agent.

Oxidants are used to remove reduced soils, such as many organic fouling. Reducing agents are used to remove oxidizing dirt, such as rust.

4. Metal ion chelating agent

With the metal ions in the dirt with the reaction, the dirt into a soluble ash-free dispersant chelate, this ash-free dispersant or additives that is chelating agent. It is commonly used in the cleaning of rust and inorganic salts.

5. Adsorbents

A substance that removes dirt by physical adsorption or chemical adsorption of the dirt is an adsorbent for cleaning. Adsorbents with strong affinity for the dirt should be selected for cleaning.