Types of stains:
1. Enzymatic stains
2. Oxidisable stains
3. Slithery stains
4. Particulate stains
Enzymatic stains:
This type of stains are substantially formed by blood and chocolate. Enzymatic stains are generally the result of protein action. Enzyme- grounded agents help to break down proteins, beans and fats by breaking up the large, undoable motes into lower, more answerable bones. Proteases break down proteins, amylases break down bounce, and lipases break down fats.
Oxidisable stains:
Tea, coffee, red wine are the source of Oxidisable stains. Oxidize coloured substances to colourless bones by breaking down chromophores, sections of chemical structures that can beget colouration. Bleaches are frequently either oxygen- grounded or chlorine- grounded. The oxidising agent in oxygen- grounded bleaches is hydrogen peroxide; this is less effective below 40 ˚C, so the emulsion tetraacetylethylenediamine (TAED) is included to produce peracetic acid, a better oxidising agent.
Slithery stains:
Canvas, collar stains, adulation are classified as slithery stains. Surfactants help canvases and grease dissolve in water. They're motes that have a water-answerable ‘head’ and an canvas-answerable‘ tail’. They form globular structures called micelles around canvas driblets, which also allows them to dissolve in water. Exemplifications
SODIUM STEARATE (Anionic surfactant),
HEXADECYLTRIMETHYLAMMONIUM CHLORIDE (Cationic surfactant),
POLYETHYLENE ETHOXYLATE (nonionic surfactant).
Particulate stains:
Slush, soil, dirt yield particulate stains. Builders are composites that help soften hard water by removing calcium and magnesium ions. This helps remove soil motes, as they're frequently bound to fabrics by calcium ion bridging. They also enhance the action of surfactants. Triphosphates used to be generally used as builders in cleansers. Due to the environmental impact of phosphates, numerous ultramodern cleansers are now turning to zeolites.
Dry cleaning:
Washing with water can damage some garments so these fabrics bear dry cleaning. Dry cleaning isn't dry, it simply uses solvent other than water to clean cloths. To use these chemicals, professional installations and outfit are demanded.
Step 1- First dry cleaning staff label and kind particulars, also pretreat tough stains if demanded.
Step 2- The cloths are washed with a detergent in the machine’s barrel. Detergents are added to remove stains.
Step 3- At the end of the cycle, the machine applies high temperature to dematerialize the detergent.
Step 4- Fresh spot cleaning removes tough stains. Garments are pressed, bagged and hung.
Chemicals:
Utmost of the dry cleansers use the solvent tetrachloroethene or perchloroethene, it also appertained to as “perc” by the dry cleaning assiduity. The quantum of perc use has drop because of enhancement of solvent recycling styles and accoutrements but still numerous worry about habitual health issues due to exposure of perc. It's classified as probable carcinogen affects liver and feathers.
Currently perc is replaced by super critical carbon di oxide, bromopropane, silicones, and propylene glycol ethers. Bromopropane have shorter cycle time than perc but concern health problems are remain. Silicones are nontoxic but precious than perc. Carbon dioxide are nontoxic and 98% reclaim rate but high cost to convert perc machines.
References:
1) https://www.compoundchem.com/2015/06/18/stain-removal/
2) https://en.wikipedia.org/wiki/Stain
3) https://www.sterlingcleaner.com/chemistry-stain-removal/
4) https://en.wikipedia.org/wiki/Dry_cleaning
5) https://drycleanersatlanta.com/2014/11/chemicals-used-dry-cleaning/
