Percarbonate Sodium for Detergent Raw Materials
1.What’s Sodium percarbonate?
Sodium percarbonate is also named as solid hydrogen peroxide,This material is an addition of sodium carbonate and hydrogen peroxide.It’s fomulation is 2Na2CO3 . 3H2O2 .
Sodium percarbonate has high content of oxygen,and has good solution in the water.When was placed in water,it release H2O2 and Na2CO3,also it can dissolve well in code water.
2Na2CO3 . 3H2O2 —> 2Na2CO3 + 3H2O2
H2O2 disolves in water as following:
According to the two equations,the ion HOO- has bleaching function,but HOO- ion is easily dissolve if infected by heavy metal ion,reduce the effective bleaching of H2O2.While alkalescence medium is useful for the form of 2HOO-,while the PH value is the important factor thatinfect the bleaching function.Usually PH value is very high or very low is not useful for bleaching, PH 10-11 is suituable.Sodium carbonate in water shows alkaline.Sodium percarbonate liquor whichChroma is1%-3% ,the PH value is 10.5- 11,it is a very good envirment for bleaching.
Detergent or bleach compositions formulated with sodium percarbonate have an strong stain removal capability. It is very effective as a laundry presoak for heavily stained articles. It is color safe. It brightens colors and prevent fabric form become yellowed or darkened.
Sodium percarbonate is effective as a disinfectant on both bacteria and virus. It’s an excellent ingredient in personal care and home care formulations for hygiene.
For its environmental advantages, sodium percarbonate is a good oxygen release chemical for agricultural and aquicultural applications.
Compared with chlorine bleaching chemicals that have contaminations on the environment, sodium percarbonate is an environmentally friendly chemical which decomposes into oxygen, water and natural soda ash when in contact with hydrous media.
Sodium percarbonate is increasingly being the substitute for sodium perborate in detergent formulations due to its lower dissolving temperature in water, as well as the characteristic of no contamination on soil, as sodium perborate is made of borax which is found to have negative impact on the soil quality.
Bleach is a popular laundry aid and helps detergents remove soils and stains. Through oxidization, laundry bleaches convert soil into more soluble, colorless or dispersible particles that can be removed by detergent and carried away in the wash water.
The two general oxidizing types are sodium hypochlorite (also called chlorine or liquid household bleach) and oxygen. Sodium hypochlorite and oxygen bleaches should not be used together. The benefits of both are lost when combined.
Color removers, considered reducing bleaches, are also products in the bleach category.
Sodium Hypochlorite Bleach
Liquid sodium hypochlorite bleach is the most widely used, although a dry form is also available. Liquid sodium hypochlorite bleach is made by combining chlorine with a solution of sodium hydroxide to produce sodium hypochlorite, sodium chloride and water. The sodium chloride is a by-product of the chemical reaction and remains in the solution as an inactive ingredient. When liquid sodium hypochlorite bleach is added to the wash, sodium hypochlorite reacts with the soil and organic matter.
As a result, liquid household bleach:
1) Oxidizes soil and aids in its removal
2) Acts as a disinfectant on both bacteria and viruses likely to be encountered in the home 3) Generally whitens fabrics
The bleaching action of sodium hypochlorite is essentially completed in about 5 minutes, even less time in hot water, but slightly longer in cold.
The dry version performs like liquid sodium hypochlorite bleach when dissolved in water.
How to Use Sodium Hypochlorite Bleach:
Read and follow bleach package directions. Use a standard measuring cup and measure the recommended amount. For best results, dilute bleach with a quart (0.95 L) of water and add about 5 minutes after the wash cycle has begun. Applying undiluted bleach directly to fabrics may result in color removal and/or weakening of the fabric. Adding bleach at the beginning of the wash cycle with the detergent destroys some detergent ingredients (FWAs, enzymes). This reduces the effectiveness of both detergent and bleach. Adding bleach after 5 to 6 minutes allows the FWAs to attach to fabrics, the enzymes to work on soils and the bleach to have maximum effectiveness.
For washers with dispensers where bleach is automatically dispensed and diluted, follow the manufacturer’s instructions.
Sodium hypochlorite bleach can be used on all washable colorfast natural fibers (cotton, linen) except protein fibers like wool, silk and mohair. It is also safe on all washable synthetic and permanent press fabrics, except spandex. Sodium hypochlorite bleach is safe for most (70 to 80%) colored washable fabrics. To determine if a color is bleach safe, apply one drop of a test solution made from 1 tablespoon (15 ml) of bleach in 1/4 cup (60 ml) of water to an inconspicuous part of the fabric or garment, such as a seam allowance. Be sure the solution penetrates the fabric. Let stand for 1 minute and blot dry with a paper towel. If there is no color change, the article can be safely bleached. Be sure to test decorative trim
Oxygen Bleach (all-fabric bleach)
Oxygen bleaches are available in both a dry and liquid form. All dry oxygen bleaches contain inorganic peroxygen compounds, such as sodium perborate tetrahydrate and sodium percarbonate. When dissolved, the inorganic peroxygen compounds convert to hydrogen peroxide (the oxidizing agent) and the residue of the compound (e.g., sodium borate or carbonate). Liquid oxygen bleaches contain hydrogen peroxide, which supplies the oxidizing agent directly. The hydrogen peroxide reacts with the soil and organic materials in the wash to either decolorize or break them up. Hydrogen peroxide provides a more gentle bleaching action than sodium hypochlorite used in chlorine bleaches.
Water temperature affects the bleaching rate of oxygen bleaches. Hot water accelerates the bleaching action. As water temperature decreases below 130 degrees F, exposure time must be increased substantially.
Powdered oxygen bleaches also contain a builder, usually sodium carbonate, which provides additional alkalinity and allows the perborate to function more effectively as a bleach. Other ingredients _ such as surfactants, brighteners, bluing agents and fragrance _ can be incorporated into both liquid and powdered formulations. Enzymes are used in powdered bleaches.
we look at global trends in the detergent market we see a strong emphasis on sustainability in a changing market place and increased focus on consumer needs, convenience and product choice. There is also an increasing threat of government legislation at national and regional level on the detergent industry.
Product performance requirements include a need for higher activity than current systems good performance at lower temperature <30-40C lower dosing lower water use reduced chemical load on the environment environmental acceptability provided at equivalent or lower cost (especially in developing regions of the world) with low energy usage. In practice, for bleaching systems this means maintenance of good performance under increasingly stressed conditions.
If we look at the key characteristics of sodium percarbonate which have supported the move from perborate in Europe, these include its high bulk density, which offers formulators a
compaction benefit in production of compact detergent powders and tablets, while maintaining a high activity content. high solubility and rapid dissolution rate, which means that hydrogen
peroxide is released rapidly in the wash cycle, even at low temperature allowing rapid generation of the active bleaching species dual functionality ie the combination of bleach and builder/ source of alkali in one molecule.
These factors in combination with enhanced stability in detergent formulations have enabled sodium percarbonate to gain wide acceptance in European detergent formulations. Sodium percarbonate can be safely handled, transported and stored in bulk, and offers economic and environmental benefits.