When it comes to washing, water is indispensable, and the ideal water quality is soft water. There is very little soft water in nature, even tap water is hard water. From the point of view of washing, impurities such as calcium and magnesium are very harmful to washing. When washing, these impurities must be removed like removing dirt, and Sodium Hexametaphosphate, as a softener, is also a key factor affecting the washing effect.
If the washing water exceeds a certain hardness standard, it will affect the washing quality of clothes and cause certain harm. Before talking about sodium hexametaphosphate, I'd like to talk about the hazards of using hard water in the washing process, mainly in the following aspects:
1. Affect washing effect
Washing with hard water can cause bad results. Calcium and magnesium ions in hard water deposit on the fabric, which makes the white fabric gray, affects the whiteness and handle, makes the color of the color fabric dark, lose the bright sense, and the handle is rough.
Calcium and magnesium ions are deposited on the fabric and adhere to the fiber firmly. It is difficult to remove the calcium and magnesium ions from the fabric and make the gray white fabric white. The best way to avoid or reduce the occurrence of greying in hard water is to take preventive measures (using softened water) during washing.
2. Reduce the effective function of Detergent
Calcium and magnesium ions in hard water combine with surfactants in detergents to form metal salts, which makes surfactants lose their vitality and can not give full play to the proper performance of detergents. In other words, some detergents are wasted and the main functions of detergents are reduced.
3. The dirt on the fabric cannot be completely removed
Calcium and magnesium ions in water can combine with the substances in detergent to form sediment. In addition, calcium ions also affect the removal of colored dirt, making some dirt still adhere to clothes after washing, drill into fiber holes and capillaries, hide in the fiber gap, and it is more difficult to remove it.
4. Affect the appearance and service life of fabric
Hard water makes the original gorgeous clothing fabric color become dull and dull, and the whiteness of white fabric is gradually reduced. As time goes on, it will damage the color of fiber and change the color light. It will cause more harm to silk and wool fabrics, such as hardening, brittleness, breaking, reducing fastness, etc., losing the original softness and shortening the service life of clothing fabrics.
5. Increase washing cost
When washing clothes with hard water, the hardness component can offset the alkalinity of soap, thus reducing the decontamination ability and increasing the amount of soap. After increasing the amount of detergent, it is necessary to increase the number of rinses and prolong the washing time after repeated "water pouring", resulting in the waste of water and detergent, and it also takes a lot of labor to remove the dirt.
6. Shorten the service life of washing equipment
Under the action of temperature, the deposited scale will erode the metal surface of washing machinery, and the consolidation of minerals will block the water pipe, causing serious wear of running parts and greatly shortening the service life of washing equipment. In addition, hard water also has a certain harm to clothing ironing.
Sodium hexametaphosphate (SHMP) has been widely used in ceramics, refractories, detergents and other industries from the beginning of Water Treatment to overcome the "red water" phenomenon. It is also an important industrial raw material for water treatment. It is easily soluble in water and the aqueous solution is alkaline. The pH of 1% sodium hexametaphosphate aqueous solution is 9.7, and it is hydrolyzed into phosphite gradually in water. It has good ability of complexing metal ions with calcium and magnesium Metal ions such as iron and iron are complexed to form soluble complex, which can soften hard water, reduce the amount of detergent used in washing and increase the cleanliness of clothes.
